clang 10.0.0git

SemaDeclCXX.cpp
Go to the documentation of this file.
1 //===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements semantic analysis for C++ declarations.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "clang/AST/ASTConsumer.h"
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/ASTLambda.h"
16 #include "clang/AST/ASTMutationListener.h"
17 #include "clang/AST/CXXInheritance.h"
18 #include "clang/AST/CharUnits.h"
19 #include "clang/AST/ComparisonCategories.h"
20 #include "clang/AST/EvaluatedExprVisitor.h"
21 #include "clang/AST/ExprCXX.h"
22 #include "clang/AST/RecordLayout.h"
23 #include "clang/AST/RecursiveASTVisitor.h"
24 #include "clang/AST/StmtVisitor.h"
25 #include "clang/AST/TypeLoc.h"
26 #include "clang/AST/TypeOrdering.h"
27 #include "clang/Basic/AttributeCommonInfo.h"
28 #include "clang/Basic/PartialDiagnostic.h"
29 #include "clang/Basic/TargetInfo.h"
30 #include "clang/Lex/LiteralSupport.h"
31 #include "clang/Lex/Preprocessor.h"
32 #include "clang/Sema/CXXFieldCollector.h"
33 #include "clang/Sema/DeclSpec.h"
34 #include "clang/Sema/Initialization.h"
35 #include "clang/Sema/Lookup.h"
36 #include "clang/Sema/ParsedTemplate.h"
37 #include "clang/Sema/Scope.h"
38 #include "clang/Sema/ScopeInfo.h"
39 #include "clang/Sema/SemaInternal.h"
40 #include "clang/Sema/Template.h"
41 #include "llvm/ADT/STLExtras.h"
42 #include "llvm/ADT/SmallString.h"
43 #include "llvm/ADT/StringExtras.h"
44 #include <map>
45 #include <set>
46
47 using namespace clang;
48
49 //===----------------------------------------------------------------------===//
50 // CheckDefaultArgumentVisitor
51 //===----------------------------------------------------------------------===//
52
53 namespace {
54 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses
55 /// the default argument of a parameter to determine whether it
56 /// contains any ill-formed subexpressions. For example, this will
57 /// diagnose the use of local variables or parameters within the
58 /// default argument expression.
59 class CheckDefaultArgumentVisitor
60 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> {
61 Expr *DefaultArg;
62 Sema *S;
63
64 public:
65 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s)
66 : DefaultArg(defarg), S(s) {}
67
68 bool VisitExpr(Expr *Node);
69 bool VisitDeclRefExpr(DeclRefExpr *DRE);
70 bool VisitCXXThisExpr(CXXThisExpr *ThisE);
71 bool VisitLambdaExpr(LambdaExpr *Lambda);
72 bool VisitPseudoObjectExpr(PseudoObjectExpr *POE);
73 };
74
75 /// VisitExpr - Visit all of the children of this expression.
76 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) {
77 bool IsInvalid = false;
78 for (Stmt *SubStmt : Node->children())
79 IsInvalid |= Visit(SubStmt);
80 return IsInvalid;
81 }
82
83 /// VisitDeclRefExpr - Visit a reference to a declaration, to
84 /// determine whether this declaration can be used in the default
85 /// argument expression.
86 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) {
87 NamedDecl *Decl = DRE->getDecl();
88 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) {
89 // C++ [dcl.fct.default]p9
90 // Default arguments are evaluated each time the function is
91 // called. The order of evaluation of function arguments is
92 // unspecified. Consequently, parameters of a function shall not
93 // be used in default argument expressions, even if they are not
94 // evaluated. Parameters of a function declared before a default
95 // argument expression are in scope and can hide namespace and
96 // class member names.
97 return S->Diag(DRE->getBeginLoc(),
98 diag::err_param_default_argument_references_param)
99 << Param->getDeclName() << DefaultArg->getSourceRange();
100 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) {
101 // C++ [dcl.fct.default]p7
102 // Local variables shall not be used in default argument
103 // expressions.
104 if (VDecl->isLocalVarDecl())
105 return S->Diag(DRE->getBeginLoc(),
106 diag::err_param_default_argument_references_local)
107 << VDecl->getDeclName() << DefaultArg->getSourceRange();
108 }
109
110 return false;
111 }
112
113 /// VisitCXXThisExpr - Visit a C++ "this" expression.
114 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) {
115 // C++ [dcl.fct.default]p8:
116 // The keyword this shall not be used in a default argument of a
117 // member function.
118 return S->Diag(ThisE->getBeginLoc(),
119 diag::err_param_default_argument_references_this)
120 << ThisE->getSourceRange();
121 }
122
123 bool CheckDefaultArgumentVisitor::VisitPseudoObjectExpr(PseudoObjectExpr *POE) {
124 bool Invalid = false;
125 for (PseudoObjectExpr::semantics_iterator
126 i = POE->semantics_begin(), e = POE->semantics_end(); i != e; ++i) {
127 Expr *E = *i;
128
129 // Look through bindings.
130 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) {
131 E = OVE->getSourceExpr();
132 assert(E && "pseudo-object binding without source expression?");
133 }
134
135 Invalid |= Visit(E);
136 }
137 return Invalid;
138 }
139
140 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) {
141 // C++11 [expr.lambda.prim]p13:
142 // A lambda-expression appearing in a default argument shall not
143 // implicitly or explicitly capture any entity.
144 if (Lambda->capture_begin() == Lambda->capture_end())
145 return false;
146
147 return S->Diag(Lambda->getBeginLoc(), diag::err_lambda_capture_default_arg);
148 }
149 }
150
151 void
152 Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc,
153 const CXXMethodDecl *Method) {
154 // If we have an MSAny spec already, don't bother.
155 if (!Method || ComputedEST == EST_MSAny)
156 return;
157
158 const FunctionProtoType *Proto
159 = Method->getType()->getAs<FunctionProtoType>();
160 Proto = Self->ResolveExceptionSpec(CallLoc, Proto);
161 if (!Proto)
162 return;
163
164 ExceptionSpecificationType EST = Proto->getExceptionSpecType();
165
166 // If we have a throw-all spec at this point, ignore the function.
167 if (ComputedEST == EST_None)
168 return;
169
170 if (EST == EST_None && Method->hasAttr<NoThrowAttr>())
171 EST = EST_BasicNoexcept;
172
173 switch (EST) {
174 case EST_Unparsed:
175 case EST_Uninstantiated:
176 case EST_Unevaluated:
177 llvm_unreachable("should not see unresolved exception specs here");
178
179 // If this function can throw any exceptions, make a note of that.
180 case EST_MSAny:
181 case EST_None:
182 // FIXME: Whichever we see last of MSAny and None determines our result.
183 // We should make a consistent, order-independent choice here.
184 ClearExceptions();
185 ComputedEST = EST;
186 return;
187 case EST_NoexceptFalse:
188 ClearExceptions();
189 ComputedEST = EST_None;
190 return;
191 // FIXME: If the call to this decl is using any of its default arguments, we
192 // need to search them for potentially-throwing calls.
193 // If this function has a basic noexcept, it doesn't affect the outcome.
194 case EST_BasicNoexcept:
195 case EST_NoexceptTrue:
196 case EST_NoThrow:
197 return;
198 // If we're still at noexcept(true) and there's a throw() callee,
199 // change to that specification.
200 case EST_DynamicNone:
201 if (ComputedEST == EST_BasicNoexcept)
202 ComputedEST = EST_DynamicNone;
203 return;
204 case EST_DependentNoexcept:
205 llvm_unreachable(
206 "should not generate implicit declarations for dependent cases");
207 case EST_Dynamic:
208 break;
209 }
210 assert(EST == EST_Dynamic && "EST case not considered earlier.");
211 assert(ComputedEST != EST_None &&
212 "Shouldn't collect exceptions when throw-all is guaranteed.");
213 ComputedEST = EST_Dynamic;
214 // Record the exceptions in this function's exception specification.
215 for (const auto &E : Proto->exceptions())
216 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(E)).second)
217 Exceptions.push_back(E);
218 }
219
220 void Sema::ImplicitExceptionSpecification::CalledStmt(Stmt *S) {
221 if (!S || ComputedEST == EST_MSAny)
222 return;
223
224 // FIXME:
225 //
226 // C++0x [except.spec]p14:
227 // [An] implicit exception-specification specifies the type-id T if and
228 // only if T is allowed by the exception-specification of a function directly
229 // invoked by f's implicit definition; f shall allow all exceptions if any
230 // function it directly invokes allows all exceptions, and f shall allow no
231 // exceptions if every function it directly invokes allows no exceptions.
232 //
233 // Note in particular that if an implicit exception-specification is generated
234 // for a function containing a throw-expression, that specification can still
235 // be noexcept(true).
236 //
237 // Note also that 'directly invoked' is not defined in the standard, and there
238 // is no indication that we should only consider potentially-evaluated calls.
239 //
240 // Ultimately we should implement the intent of the standard: the exception
241 // specification should be the set of exceptions which can be thrown by the
242 // implicit definition. For now, we assume that any non-nothrow expression can
243 // throw any exception.
244
245 if (Self->canThrow(S))
246 ComputedEST = EST_None;
247 }
248
249 bool
250 Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg,
251 SourceLocation EqualLoc) {
252 if (RequireCompleteType(Param->getLocation(), Param->getType(),
253 diag::err_typecheck_decl_incomplete_type)) {
254 Param->setInvalidDecl();
255 return true;
256 }
257
258 // C++ [dcl.fct.default]p5
259 // A default argument expression is implicitly converted (clause
260 // 4) to the parameter type. The default argument expression has
261 // the same semantic constraints as the initializer expression in
262 // a declaration of a variable of the parameter type, using the
263 // copy-initialization semantics (8.5).
264 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
265 Param);
266 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(),
267 EqualLoc);
268 InitializationSequence InitSeq(*this, Entity, Kind, Arg);
269 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg);
270 if (Result.isInvalid())
271 return true;
272 Arg = Result.getAs<Expr>();
273
274 CheckCompletedExpr(Arg, EqualLoc);
275 Arg = MaybeCreateExprWithCleanups(Arg);
276
277 // Okay: add the default argument to the parameter
278 Param->setDefaultArg(Arg);
279
280 // We have already instantiated this parameter; provide each of the
281 // instantiations with the uninstantiated default argument.
282 UnparsedDefaultArgInstantiationsMap::iterator InstPos
283 = UnparsedDefaultArgInstantiations.find(Param);
284 if (InstPos != UnparsedDefaultArgInstantiations.end()) {
285 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I)
286 InstPos->second[I]->setUninstantiatedDefaultArg(Arg);
287
288 // We're done tracking this parameter's instantiations.
289 UnparsedDefaultArgInstantiations.erase(InstPos);
290 }
291
292 return false;
293 }
294
295 /// ActOnParamDefaultArgument - Check whether the default argument
296 /// provided for a function parameter is well-formed. If so, attach it
297 /// to the parameter declaration.
298 void
299 Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc,
300 Expr *DefaultArg) {
301 if (!param || !DefaultArg)
302 return;
303
304 ParmVarDecl *Param = cast<ParmVarDecl>(param);
305 UnparsedDefaultArgLocs.erase(Param);
306
307 // Default arguments are only permitted in C++
308 if (!getLangOpts().CPlusPlus) {
309 Diag(EqualLoc, diag::err_param_default_argument)
310 << DefaultArg->getSourceRange();
311 Param->setInvalidDecl();
312 return;
313 }
314
315 // Check for unexpanded parameter packs.
316 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) {
317 Param->setInvalidDecl();
318 return;
319 }
320
321 // C++11 [dcl.fct.default]p3
322 // A default argument expression [...] shall not be specified for a
323 // parameter pack.
324 if (Param->isParameterPack()) {
325 Diag(EqualLoc, diag::err_param_default_argument_on_parameter_pack)
326 << DefaultArg->getSourceRange();
327 return;
328 }
329
330 // Check that the default argument is well-formed
331 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this);
332 if (DefaultArgChecker.Visit(DefaultArg)) {
333 Param->setInvalidDecl();
334 return;
335 }
336
337 SetParamDefaultArgument(Param, DefaultArg, EqualLoc);
338 }
339
340 /// ActOnParamUnparsedDefaultArgument - We've seen a default
341 /// argument for a function parameter, but we can't parse it yet
342 /// because we're inside a class definition. Note that this default
343 /// argument will be parsed later.
344 void Sema::ActOnParamUnparsedDefaultArgument(Decl *param,
345 SourceLocation EqualLoc,
346 SourceLocation ArgLoc) {
347 if (!param)
348 return;
349
350 ParmVarDecl *Param = cast<ParmVarDecl>(param);
351 Param->setUnparsedDefaultArg();
352 UnparsedDefaultArgLocs[Param] = ArgLoc;
353 }
354
355 /// ActOnParamDefaultArgumentError - Parsing or semantic analysis of
356 /// the default argument for the parameter param failed.
357 void Sema::ActOnParamDefaultArgumentError(Decl *param,
358 SourceLocation EqualLoc) {
359 if (!param)
360 return;
361
362 ParmVarDecl *Param = cast<ParmVarDecl>(param);
363 Param->setInvalidDecl();
364 UnparsedDefaultArgLocs.erase(Param);
365 Param->setDefaultArg(new(Context)
366 OpaqueValueExpr(EqualLoc,
367 Param->getType().getNonReferenceType(),
368 VK_RValue));
369 }
370
371 /// CheckExtraCXXDefaultArguments - Check for any extra default
372 /// arguments in the declarator, which is not a function declaration
373 /// or definition and therefore is not permitted to have default
374 /// arguments. This routine should be invoked for every declarator
375 /// that is not a function declaration or definition.
376 void Sema::CheckExtraCXXDefaultArguments(Declarator &D) {
377 // C++ [dcl.fct.default]p3
378 // A default argument expression shall be specified only in the
379 // parameter-declaration-clause of a function declaration or in a
380 // template-parameter (14.1). It shall not be specified for a
381 // parameter pack. If it is specified in a
382 // parameter-declaration-clause, it shall not occur within a
383 // declarator or abstract-declarator of a parameter-declaration.
384 bool MightBeFunction = D.isFunctionDeclarationContext();
385 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
386 DeclaratorChunk &chunk = D.getTypeObject(i);
387 if (chunk.Kind == DeclaratorChunk::Function) {
388 if (MightBeFunction) {
389 // This is a function declaration. It can have default arguments, but
390 // keep looking in case its return type is a function type with default
391 // arguments.
392 MightBeFunction = false;
393 continue;
394 }
395 for (unsigned argIdx = 0, e = chunk.Fun.NumParams; argIdx != e;
396 ++argIdx) {
397 ParmVarDecl *Param = cast<ParmVarDecl>(chunk.Fun.Params[argIdx].Param);
398 if (Param->hasUnparsedDefaultArg()) {
399 std::unique_ptr<CachedTokens> Toks =
400 std::move(chunk.Fun.Params[argIdx].DefaultArgTokens);
401 SourceRange SR;
402 if (Toks->size() > 1)
403 SR = SourceRange((*Toks)[1].getLocation(),
404 Toks->back().getLocation());
405 else
406 SR = UnparsedDefaultArgLocs[Param];
407 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
408 << SR;
409 } else if (Param->getDefaultArg()) {
410 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
411 << Param->getDefaultArg()->getSourceRange();
412 Param->setDefaultArg(nullptr);
413 }
414 }
415 } else if (chunk.Kind != DeclaratorChunk::Paren) {
416 MightBeFunction = false;
417 }
418 }
419 }
420
421 static bool functionDeclHasDefaultArgument(const FunctionDecl *FD) {
422 for (unsigned NumParams = FD->getNumParams(); NumParams > 0; --NumParams) {
423 const ParmVarDecl *PVD = FD->getParamDecl(NumParams-1);
424 if (!PVD->hasDefaultArg())
425 return false;
426 if (!PVD->hasInheritedDefaultArg())
427 return true;
428 }
429 return false;
430 }
431
432 /// MergeCXXFunctionDecl - Merge two declarations of the same C++
433 /// function, once we already know that they have the same
434 /// type. Subroutine of MergeFunctionDecl. Returns true if there was an
435 /// error, false otherwise.
436 bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old,
437 Scope *S) {
438 bool Invalid = false;
439
440 // The declaration context corresponding to the scope is the semantic
441 // parent, unless this is a local function declaration, in which case
442 // it is that surrounding function.
443 DeclContext *ScopeDC = New->isLocalExternDecl()
444 ? New->getLexicalDeclContext()
445 : New->getDeclContext();
446
447 // Find the previous declaration for the purpose of default arguments.
448 FunctionDecl *PrevForDefaultArgs = Old;
449 for (/**/; PrevForDefaultArgs;
450 // Don't bother looking back past the latest decl if this is a local
451 // extern declaration; nothing else could work.
452 PrevForDefaultArgs = New->isLocalExternDecl()
453 ? nullptr
454 : PrevForDefaultArgs->getPreviousDecl()) {
455 // Ignore hidden declarations.
456 if (!LookupResult::isVisible(*this, PrevForDefaultArgs))
457 continue;
458
459 if (S && !isDeclInScope(PrevForDefaultArgs, ScopeDC, S) &&
460 !New->isCXXClassMember()) {
461 // Ignore default arguments of old decl if they are not in
462 // the same scope and this is not an out-of-line definition of
463 // a member function.
464 continue;
465 }
466
467 if (PrevForDefaultArgs->isLocalExternDecl() != New->isLocalExternDecl()) {
468 // If only one of these is a local function declaration, then they are
469 // declared in different scopes, even though isDeclInScope may think
470 // they're in the same scope. (If both are local, the scope check is
471 // sufficient, and if neither is local, then they are in the same scope.)
472 continue;
473 }
474
475 // We found the right previous declaration.
476 break;
477 }
478
479 // C++ [dcl.fct.default]p4:
480 // For non-template functions, default arguments can be added in
481 // later declarations of a function in the same
482 // scope. Declarations in different scopes have completely
483 // distinct sets of default arguments. That is, declarations in
484 // inner scopes do not acquire default arguments from
485 // declarations in outer scopes, and vice versa. In a given
486 // function declaration, all parameters subsequent to a
487 // parameter with a default argument shall have default
488 // arguments supplied in this or previous declarations. A
489 // default argument shall not be redefined by a later
490 // declaration (not even to the same value).
491 //
492 // C++ [dcl.fct.default]p6:
493 // Except for member functions of class templates, the default arguments
494 // in a member function definition that appears outside of the class
495 // definition are added to the set of default arguments provided by the
496 // member function declaration in the class definition.
497 for (unsigned p = 0, NumParams = PrevForDefaultArgs
498 ? PrevForDefaultArgs->getNumParams()
499 : 0;
500 p < NumParams; ++p) {
501 ParmVarDecl *OldParam = PrevForDefaultArgs->getParamDecl(p);
502 ParmVarDecl *NewParam = New->getParamDecl(p);
503
504 bool OldParamHasDfl = OldParam ? OldParam->hasDefaultArg() : false;
505 bool NewParamHasDfl = NewParam->hasDefaultArg();
506
507 if (OldParamHasDfl && NewParamHasDfl) {
508 unsigned DiagDefaultParamID =
509 diag::err_param_default_argument_redefinition;
510
511 // MSVC accepts that default parameters be redefined for member functions
512 // of template class. The new default parameter's value is ignored.
513 Invalid = true;
514 if (getLangOpts().MicrosoftExt) {
515 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(New);
516 if (MD && MD->getParent()->getDescribedClassTemplate()) {
517 // Merge the old default argument into the new parameter.
518 NewParam->setHasInheritedDefaultArg();
519 if (OldParam->hasUninstantiatedDefaultArg())
520 NewParam->setUninstantiatedDefaultArg(
521 OldParam->getUninstantiatedDefaultArg());
522 else
523 NewParam->setDefaultArg(OldParam->getInit());
524 DiagDefaultParamID = diag::ext_param_default_argument_redefinition;
525 Invalid = false;
526 }
527 }
528
529 // FIXME: If we knew where the '=' was, we could easily provide a fix-it
530 // hint here. Alternatively, we could walk the type-source information
531 // for NewParam to find the last source location in the type... but it
532 // isn't worth the effort right now. This is the kind of test case that
533 // is hard to get right:
534 // int f(int);
535 // void g(int (*fp)(int) = f);
536 // void g(int (*fp)(int) = &f);
537 Diag(NewParam->getLocation(), DiagDefaultParamID)
538 << NewParam->getDefaultArgRange();
539
540 // Look for the function declaration where the default argument was
541 // actually written, which may be a declaration prior to Old.
542 for (auto Older = PrevForDefaultArgs;
543 OldParam->hasInheritedDefaultArg(); /**/) {
544 Older = Older->getPreviousDecl();
545 OldParam = Older->getParamDecl(p);
546 }
547
548 Diag(OldParam->getLocation(), diag::note_previous_definition)
549 << OldParam->getDefaultArgRange();
550 } else if (OldParamHasDfl) {
551 // Merge the old default argument into the new parameter unless the new
552 // function is a friend declaration in a template class. In the latter
553 // case the default arguments will be inherited when the friend
554 // declaration will be instantiated.
555 if (New->getFriendObjectKind() == Decl::FOK_None ||
556 !New->getLexicalDeclContext()->isDependentContext()) {
557 // It's important to use getInit() here; getDefaultArg()
558 // strips off any top-level ExprWithCleanups.
559 NewParam->setHasInheritedDefaultArg();
560 if (OldParam->hasUnparsedDefaultArg())
561 NewParam->setUnparsedDefaultArg();
562 else if (OldParam->hasUninstantiatedDefaultArg())
563 NewParam->setUninstantiatedDefaultArg(
564 OldParam->getUninstantiatedDefaultArg());
565 else
566 NewParam->setDefaultArg(OldParam->getInit());
567 }
568 } else if (NewParamHasDfl) {
569 if (New->getDescribedFunctionTemplate()) {
570 // Paragraph 4, quoted above, only applies to non-template functions.
571 Diag(NewParam->getLocation(),
572 diag::err_param_default_argument_template_redecl)
573 << NewParam->getDefaultArgRange();
574 Diag(PrevForDefaultArgs->getLocation(),
575 diag::note_template_prev_declaration)
576 << false;
577 } else if (New->getTemplateSpecializationKind()
578 != TSK_ImplicitInstantiation &&
579 New->getTemplateSpecializationKind() != TSK_Undeclared) {
580 // C++ [temp.expr.spec]p21:
581 // Default function arguments shall not be specified in a declaration
582 // or a definition for one of the following explicit specializations:
583 // - the explicit specialization of a function template;
584 // - the explicit specialization of a member function template;
585 // - the explicit specialization of a member function of a class
586 // template where the class template specialization to which the
587 // member function specialization belongs is implicitly
588 // instantiated.
589 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg)
590 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization)
591 << New->getDeclName()
592 << NewParam->getDefaultArgRange();
593 } else if (New->getDeclContext()->isDependentContext()) {
594 // C++ [dcl.fct.default]p6 (DR217):
595 // Default arguments for a member function of a class template shall
596 // be specified on the initial declaration of the member function
597 // within the class template.
598 //
599 // Reading the tea leaves a bit in DR217 and its reference to DR205
600 // leads me to the conclusion that one cannot add default function
601 // arguments for an out-of-line definition of a member function of a
602 // dependent type.
603 int WhichKind = 2;
604 if (CXXRecordDecl *Record
605 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) {
606 if (Record->getDescribedClassTemplate())
607 WhichKind = 0;
608 else if (isa<ClassTemplatePartialSpecializationDecl>(Record))
609 WhichKind = 1;
610 else
611 WhichKind = 2;
612 }
613
614 Diag(NewParam->getLocation(),
615 diag::err_param_default_argument_member_template_redecl)
616 << WhichKind
617 << NewParam->getDefaultArgRange();
618 }
619 }
620 }
621
622 // DR1344: If a default argument is added outside a class definition and that
623 // default argument makes the function a special member function, the program
624 // is ill-formed. This can only happen for constructors.
625 if (isa<CXXConstructorDecl>(New) &&
626 New->getMinRequiredArguments() < Old->getMinRequiredArguments()) {
627 CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)),
628 OldSM = getSpecialMember(cast<CXXMethodDecl>(Old));
629 if (NewSM != OldSM) {
630 ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments());
631 assert(NewParam->hasDefaultArg());
632 Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special)
633 << NewParam->getDefaultArgRange() << NewSM;
634 Diag(Old->getLocation(), diag::note_previous_declaration);
635 }
636 }
637
638 const FunctionDecl *Def;
639 // C++11 [dcl.constexpr]p1: If any declaration of a function or function
640 // template has a constexpr specifier then all its declarations shall
641 // contain the constexpr specifier.
642 if (New->getConstexprKind() != Old->getConstexprKind()) {
643 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch)
644 << New << New->getConstexprKind() << Old->getConstexprKind();
645 Diag(Old->getLocation(), diag::note_previous_declaration);
646 Invalid = true;
647 } else if (!Old->getMostRecentDecl()->isInlined() && New->isInlined() &&
648 Old->isDefined(Def) &&
649 // If a friend function is inlined but does not have 'inline'
650 // specifier, it is a definition. Do not report attribute conflict
651 // in this case, redefinition will be diagnosed later.
652 (New->isInlineSpecified() ||
653 New->getFriendObjectKind() == Decl::FOK_None)) {
654 // C++11 [dcl.fcn.spec]p4:
655 // If the definition of a function appears in a translation unit before its
656 // first declaration as inline, the program is ill-formed.
657 Diag(New->getLocation(), diag::err_inline_decl_follows_def) << New;
658 Diag(Def->getLocation(), diag::note_previous_definition);
659 Invalid = true;
660 }
661
662 // C++17 [temp.deduct.guide]p3:
663 // Two deduction guide declarations in the same translation unit
664 // for the same class template shall not have equivalent
665 // parameter-declaration-clauses.
666 if (isa<CXXDeductionGuideDecl>(New) &&
667 !New->isFunctionTemplateSpecialization()) {
668 Diag(New->getLocation(), diag::err_deduction_guide_redeclared);
669 Diag(Old->getLocation(), diag::note_previous_declaration);
670 }
671
672 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a default
673 // argument expression, that declaration shall be a definition and shall be
674 // the only declaration of the function or function template in the
675 // translation unit.
676 if (Old->getFriendObjectKind() == Decl::FOK_Undeclared &&
677 functionDeclHasDefaultArgument(Old)) {
678 Diag(New->getLocation(), diag::err_friend_decl_with_def_arg_redeclared);
679 Diag(Old->getLocation(), diag::note_previous_declaration);
680 Invalid = true;
681 }
682
683 return Invalid;
684 }
685
686 NamedDecl *
687 Sema::ActOnDecompositionDeclarator(Scope *S, Declarator &D,
688 MultiTemplateParamsArg TemplateParamLists) {
689 assert(D.isDecompositionDeclarator());
690 const DecompositionDeclarator &Decomp = D.getDecompositionDeclarator();
691
692 // The syntax only allows a decomposition declarator as a simple-declaration,
693 // a for-range-declaration, or a condition in Clang, but we parse it in more
694 // cases than that.
695 if (!D.mayHaveDecompositionDeclarator()) {
696 Diag(Decomp.getLSquareLoc(), diag::err_decomp_decl_context)
697 << Decomp.getSourceRange();
698 return nullptr;
699 }
700
701 if (!TemplateParamLists.empty()) {
702 // FIXME: There's no rule against this, but there are also no rules that
703 // would actually make it usable, so we reject it for now.
704 Diag(TemplateParamLists.front()->getTemplateLoc(),
705 diag::err_decomp_decl_template);
706 return nullptr;
707 }
708
709 Diag(Decomp.getLSquareLoc(),
710 !getLangOpts().CPlusPlus17
711 ? diag::ext_decomp_decl
712 : D.getContext() == DeclaratorContext::ConditionContext
713 ? diag::ext_decomp_decl_cond
714 : diag::warn_cxx14_compat_decomp_decl)
715 << Decomp.getSourceRange();
716
717 // The semantic context is always just the current context.
718 DeclContext *const DC = CurContext;
719
720 // C++17 [dcl.dcl]/8:
721 // The decl-specifier-seq shall contain only the type-specifier auto
722 // and cv-qualifiers.
723 // C++2a [dcl.dcl]/8:
724 // If decl-specifier-seq contains any decl-specifier other than static,
725 // thread_local, auto, or cv-qualifiers, the program is ill-formed.
726 auto &DS = D.getDeclSpec();
727 {
728 SmallVector<StringRef, 8> BadSpecifiers;
729 SmallVector<SourceLocation, 8> BadSpecifierLocs;
730 SmallVector<StringRef, 8> CPlusPlus20Specifiers;
731 SmallVector<SourceLocation, 8> CPlusPlus20SpecifierLocs;
732 if (auto SCS = DS.getStorageClassSpec()) {
733 if (SCS == DeclSpec::SCS_static) {
734 CPlusPlus20Specifiers.push_back(DeclSpec::getSpecifierName(SCS));
735 CPlusPlus20SpecifierLocs.push_back(DS.getStorageClassSpecLoc());
736 } else {
737 BadSpecifiers.push_back(DeclSpec::getSpecifierName(SCS));
738 BadSpecifierLocs.push_back(DS.getStorageClassSpecLoc());
739 }
740 }
741 if (auto TSCS = DS.getThreadStorageClassSpec()) {
742 CPlusPlus20Specifiers.push_back(DeclSpec::getSpecifierName(TSCS));
743 CPlusPlus20SpecifierLocs.push_back(DS.getThreadStorageClassSpecLoc());
744 }
745 if (DS.hasConstexprSpecifier()) {
746 BadSpecifiers.push_back(
747 DeclSpec::getSpecifierName(DS.getConstexprSpecifier()));
748 BadSpecifierLocs.push_back(DS.getConstexprSpecLoc());
749 }
750 if (DS.isInlineSpecified()) {
751 BadSpecifiers.push_back("inline");
752 BadSpecifierLocs.push_back(DS.getInlineSpecLoc());
753 }
754 if (!BadSpecifiers.empty()) {
755 auto &&Err = Diag(BadSpecifierLocs.front(), diag::err_decomp_decl_spec);
756 Err << (int)BadSpecifiers.size()
757 << llvm::join(BadSpecifiers.begin(), BadSpecifiers.end(), " ");
758 // Don't add FixItHints to remove the specifiers; we do still respect
759 // them when building the underlying variable.
760 for (auto Loc : BadSpecifierLocs)
761 Err << SourceRange(Loc, Loc);
762 } else if (!CPlusPlus20Specifiers.empty()) {
763 auto &&Warn = Diag(CPlusPlus20SpecifierLocs.front(),
764 getLangOpts().CPlusPlus2a
765 ? diag::warn_cxx17_compat_decomp_decl_spec
766 : diag::ext_decomp_decl_spec);
767 Warn << (int)CPlusPlus20Specifiers.size()
768 << llvm::join(CPlusPlus20Specifiers.begin(),
769 CPlusPlus20Specifiers.end(), " ");
770 for (auto Loc : CPlusPlus20SpecifierLocs)
771 Warn << SourceRange(Loc, Loc);
772 }
773 // We can't recover from it being declared as a typedef.
774 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef)
775 return nullptr;
776 }
777
778 // C++2a [dcl.struct.bind]p1:
779 // A cv that includes volatile is deprecated
780 if ((DS.getTypeQualifiers() & DeclSpec::TQ_volatile) &&
781 getLangOpts().CPlusPlus2a)
782 Diag(DS.getVolatileSpecLoc(),
783 diag::warn_deprecated_volatile_structured_binding);
784
785 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
786 QualType R = TInfo->getType();
787
788 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
789 UPPC_DeclarationType))
790 D.setInvalidType();
791
792 // The syntax only allows a single ref-qualifier prior to the decomposition
793 // declarator. No other declarator chunks are permitted. Also check the type
794 // specifier here.
795 if (DS.getTypeSpecType() != DeclSpec::TST_auto ||
796 D.hasGroupingParens() || D.getNumTypeObjects() > 1 ||
797 (D.getNumTypeObjects() == 1 &&
798 D.getTypeObject(0).Kind != DeclaratorChunk::Reference)) {
799 Diag(Decomp.getLSquareLoc(),
800 (D.hasGroupingParens() ||
801 (D.getNumTypeObjects() &&
802 D.getTypeObject(0).Kind == DeclaratorChunk::Paren))
803 ? diag::err_decomp_decl_parens
804 : diag::err_decomp_decl_type)
805 << R;
806
807 // In most cases, there's no actual problem with an explicitly-specified
808 // type, but a function type won't work here, and ActOnVariableDeclarator
809 // shouldn't be called for such a type.
810 if (R->isFunctionType())
811 D.setInvalidType();
812 }
813
814 // Build the BindingDecls.
815 SmallVector<BindingDecl*, 8> Bindings;
816
817 // Build the BindingDecls.
818 for (auto &B : D.getDecompositionDeclarator().bindings()) {
819 // Check for name conflicts.
820 DeclarationNameInfo NameInfo(B.Name, B.NameLoc);
821 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
822 ForVisibleRedeclaration);
823 LookupName(Previous, S,
824 /*CreateBuiltins*/DC->getRedeclContext()->isTranslationUnit());
825
826 // It's not permitted to shadow a template parameter name.
827 if (Previous.isSingleResult() &&
828 Previous.getFoundDecl()->isTemplateParameter()) {
829 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
830 Previous.getFoundDecl());
831 Previous.clear();
832 }
833
834 bool ConsiderLinkage = DC->isFunctionOrMethod() &&
835 DS.getStorageClassSpec() == DeclSpec::SCS_extern;
836 FilterLookupForScope(Previous, DC, S, ConsiderLinkage,
837 /*AllowInlineNamespace*/false);
838 if (!Previous.empty()) {
839 auto *Old = Previous.getRepresentativeDecl();
840 Diag(B.NameLoc, diag::err_redefinition) << B.Name;
841 Diag(Old->getLocation(), diag::note_previous_definition);
842 }
843
844 auto *BD = BindingDecl::Create(Context, DC, B.NameLoc, B.Name);
845 PushOnScopeChains(BD, S, true);
846 Bindings.push_back(BD);
847 ParsingInitForAutoVars.insert(BD);
848 }
849
850 // There are no prior lookup results for the variable itself, because it
851 // is unnamed.
852 DeclarationNameInfo NameInfo((IdentifierInfo *)nullptr,
853 Decomp.getLSquareLoc());
854 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
855 ForVisibleRedeclaration);
856
857 // Build the variable that holds the non-decomposed object.
858 bool AddToScope = true;
859 NamedDecl *New =
860 ActOnVariableDeclarator(S, D, DC, TInfo, Previous,
861 MultiTemplateParamsArg(), AddToScope, Bindings);
862 if (AddToScope) {
863 S->AddDecl(New);
864 CurContext->addHiddenDecl(New);
865 }
866
867 if (isInOpenMPDeclareTargetContext())
868 checkDeclIsAllowedInOpenMPTarget(nullptr, New);
869
870 return New;
871 }
872
873 static bool checkSimpleDecomposition(
874 Sema &S, ArrayRef<BindingDecl *> Bindings, ValueDecl *Src,
875 QualType DecompType, const llvm::APSInt &NumElems, QualType ElemType,
876 llvm::function_ref<ExprResult(SourceLocation, Expr *, unsigned)> GetInit) {
877 if ((int64_t)Bindings.size() != NumElems) {
878 S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings)
879 << DecompType << (unsigned)Bindings.size() << NumElems.toString(10)
880 << (NumElems < Bindings.size());
881 return true;
882 }
883
884 unsigned I = 0;
885 for (auto *B : Bindings) {
886 SourceLocation Loc = B->getLocation();
887 ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc);
888 if (E.isInvalid())
889 return true;
890 E = GetInit(Loc, E.get(), I++);
891 if (E.isInvalid())
892 return true;
893 B->setBinding(ElemType, E.get());
894 }
895
896 return false;
897 }
898
899 static bool checkArrayLikeDecomposition(Sema &S,
900 ArrayRef<BindingDecl *> Bindings,
901 ValueDecl *Src, QualType DecompType,
902 const llvm::APSInt &NumElems,
903 QualType ElemType) {
904 return checkSimpleDecomposition(
905 S, Bindings, Src, DecompType, NumElems, ElemType,
906 [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult {
907 ExprResult E = S.ActOnIntegerConstant(Loc, I);
908 if (E.isInvalid())
909 return ExprError();
910 return S.CreateBuiltinArraySubscriptExpr(Base, Loc, E.get(), Loc);
911 });
912 }
913
914 static bool checkArrayDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings,
915 ValueDecl *Src, QualType DecompType,
916 const ConstantArrayType *CAT) {
917 return checkArrayLikeDecomposition(S, Bindings, Src, DecompType,
918 llvm::APSInt(CAT->getSize()),
919 CAT->getElementType());
920 }
921
922 static bool checkVectorDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings,
923 ValueDecl *Src, QualType DecompType,
924 const VectorType *VT) {
925 return checkArrayLikeDecomposition(
926 S, Bindings, Src, DecompType, llvm::APSInt::get(VT->getNumElements()),
927 S.Context.getQualifiedType(VT->getElementType(),
928 DecompType.getQualifiers()));
929 }
930
931 static bool checkComplexDecomposition(Sema &S,
932 ArrayRef<BindingDecl *> Bindings,
933 ValueDecl *Src, QualType DecompType,
934 const ComplexType *CT) {
935 return checkSimpleDecomposition(
936 S, Bindings, Src, DecompType, llvm::APSInt::get(2),
937 S.Context.getQualifiedType(CT->getElementType(),
938 DecompType.getQualifiers()),
939 [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult {
940 return S.CreateBuiltinUnaryOp(Loc, I ? UO_Imag : UO_Real, Base);
941 });
942 }
943
944 static std::string printTemplateArgs(const PrintingPolicy &PrintingPolicy,
945 TemplateArgumentListInfo &Args) {
946 SmallString<128> SS;
947 llvm::raw_svector_ostream OS(SS);
948 bool First = true;
949 for (auto &Arg : Args.arguments()) {
950 if (!First)
951 OS << ", ";
952 Arg.getArgument().print(PrintingPolicy, OS);
953 First = false;
954 }
955 return OS.str();
956 }
957
958 static bool lookupStdTypeTraitMember(Sema &S, LookupResult &TraitMemberLookup,
959 SourceLocation Loc, StringRef Trait,
960 TemplateArgumentListInfo &Args,
961 unsigned DiagID) {
962 auto DiagnoseMissing = [&] {
963 if (DiagID)
964 S.Diag(Loc, DiagID) << printTemplateArgs(S.Context.getPrintingPolicy(),
965 Args);
966 return true;
967 };
968
969 // FIXME: Factor out duplication with lookupPromiseType in SemaCoroutine.
970 NamespaceDecl *Std = S.getStdNamespace();
971 if (!Std)
972 return DiagnoseMissing();
973
974 // Look up the trait itself, within namespace std. We can diagnose various
975 // problems with this lookup even if we've been asked to not diagnose a
976 // missing specialization, because this can only fail if the user has been
977 // declaring their own names in namespace std or we don't support the
978 // standard library implementation in use.
979 LookupResult Result(S, &S.PP.getIdentifierTable().get(Trait),
980 Loc, Sema::LookupOrdinaryName);
981 if (!S.LookupQualifiedName(Result, Std))
982 return DiagnoseMissing();
983 if (Result.isAmbiguous())
984 return true;
985
986 ClassTemplateDecl *TraitTD = Result.getAsSingle<ClassTemplateDecl>();
987 if (!TraitTD) {
988 Result.suppressDiagnostics();
989 NamedDecl *Found = *Result.begin();
990 S.Diag(Loc, diag::err_std_type_trait_not_class_template) << Trait;
991 S.Diag(Found->getLocation(), diag::note_declared_at);
992 return true;
993 }
994
995 // Build the template-id.
996 QualType TraitTy = S.CheckTemplateIdType(TemplateName(TraitTD), Loc, Args);
997 if (TraitTy.isNull())
998 return true;
999 if (!S.isCompleteType(Loc, TraitTy)) {
1000 if (DiagID)
1001 S.RequireCompleteType(
1002 Loc, TraitTy, DiagID,
1003 printTemplateArgs(S.Context.getPrintingPolicy(), Args));
1004 return true;
1005 }
1006
1007 CXXRecordDecl *RD = TraitTy->getAsCXXRecordDecl();
1008 assert(RD && "specialization of class template is not a class?");
1009
1010 // Look up the member of the trait type.
1011 S.LookupQualifiedName(TraitMemberLookup, RD);
1012 return TraitMemberLookup.isAmbiguous();
1013 }
1014
1015 static TemplateArgumentLoc
1016 getTrivialIntegralTemplateArgument(Sema &S, SourceLocation Loc, QualType T,
1017 uint64_t I) {
1018 TemplateArgument Arg(S.Context, S.Context.MakeIntValue(I, T), T);
1019 return S.getTrivialTemplateArgumentLoc(Arg, T, Loc);
1020 }
1021
1022 static TemplateArgumentLoc
1023 getTrivialTypeTemplateArgument(Sema &S, SourceLocation Loc, QualType T) {
1024 return S.getTrivialTemplateArgumentLoc(TemplateArgument(T), QualType(), Loc);
1025 }
1026
1027 namespace { enum class IsTupleLike { TupleLike, NotTupleLike, Error }; }
1028
1029 static IsTupleLike isTupleLike(Sema &S, SourceLocation Loc, QualType T,
1030 llvm::APSInt &Size) {
1031 EnterExpressionEvaluationContext ContextRAII(
1032 S, Sema::ExpressionEvaluationContext::ConstantEvaluated);
1033
1034 DeclarationName Value = S.PP.getIdentifierInfo("value");
1035 LookupResult R(S, Value, Loc, Sema::LookupOrdinaryName);
1036
1037 // Form template argument list for tuple_size<T>.
1038 TemplateArgumentListInfo Args(Loc, Loc);
1039 Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T));
1040
1041 // If there's no tuple_size specialization or the lookup of 'value' is empty,
1042 // it's not tuple-like.
1043 if (lookupStdTypeTraitMember(S, R, Loc, "tuple_size", Args, /*DiagID*/ 0) ||
1044 R.empty())
1045 return IsTupleLike::NotTupleLike;
1046
1047 // If we get this far, we've committed to the tuple interpretation, but
1048 // we can still fail if there actually isn't a usable ::value.
1049
1050 struct ICEDiagnoser : Sema::VerifyICEDiagnoser {
1051 LookupResult &R;
1052 TemplateArgumentListInfo &Args;
1053 ICEDiagnoser(LookupResult &R, TemplateArgumentListInfo &Args)
1054 : R(R), Args(Args) {}
1055 void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) {
1056 S.Diag(Loc, diag::err_decomp_decl_std_tuple_size_not_constant)
1057 << printTemplateArgs(S.Context.getPrintingPolicy(), Args);
1058 }
1059 } Diagnoser(R, Args);
1060
1061 ExprResult E =
1062 S.BuildDeclarationNameExpr(CXXScopeSpec(), R, /*NeedsADL*/false);
1063 if (E.isInvalid())
1064 return IsTupleLike::Error;
1065
1066 E = S.VerifyIntegerConstantExpression(E.get(), &Size, Diagnoser, false);
1067 if (E.isInvalid())
1068 return IsTupleLike::Error;
1069
1070 return IsTupleLike::TupleLike;
1071 }
1072
1073 /// \return std::tuple_element<I, T>::type.
1074 static QualType getTupleLikeElementType(Sema &S, SourceLocation Loc,
1075 unsigned I, QualType T) {
1076 // Form template argument list for tuple_element<I, T>.
1077 TemplateArgumentListInfo Args(Loc, Loc);
1078 Args.addArgument(
1079 getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I));
1080 Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T));
1081
1082 DeclarationName TypeDN = S.PP.getIdentifierInfo("type");
1083 LookupResult R(S, TypeDN, Loc, Sema::LookupOrdinaryName);
1084 if (lookupStdTypeTraitMember(
1085 S, R, Loc, "tuple_element", Args,
1086 diag::err_decomp_decl_std_tuple_element_not_specialized))
1087 return QualType();
1088
1089 auto *TD = R.getAsSingle<TypeDecl>();
1090 if (!TD) {
1091 R.suppressDiagnostics();
1092 S.Diag(Loc, diag::err_decomp_decl_std_tuple_element_not_specialized)
1093 << printTemplateArgs(S.Context.getPrintingPolicy(), Args);
1094 if (!R.empty())
1095 S.Diag(R.getRepresentativeDecl()->getLocation(), diag::note_declared_at);
1096 return QualType();
1097 }
1098
1099 return S.Context.getTypeDeclType(TD);
1100 }
1101
1102 namespace {
1103 struct BindingDiagnosticTrap {
1104 Sema &S;
1105 DiagnosticErrorTrap Trap;
1106 BindingDecl *BD;
1107
1108 BindingDiagnosticTrap(Sema &S, BindingDecl *BD)
1109 : S(S), Trap(S.Diags), BD(BD) {}
1110 ~BindingDiagnosticTrap() {
1111 if (Trap.hasErrorOccurred())
1112 S.Diag(BD->getLocation(), diag::note_in_binding_decl_init) << BD;
1113 }
1114 };
1115 }
1116
1117 static bool checkTupleLikeDecomposition(Sema &S,
1118 ArrayRef<BindingDecl *> Bindings,
1119 VarDecl *Src, QualType DecompType,
1120 const llvm::APSInt &TupleSize) {
1121 if ((int64_t)Bindings.size() != TupleSize) {
1122 S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings)
1123 << DecompType << (unsigned)Bindings.size() << TupleSize.toString(10)
1124 << (TupleSize < Bindings.size());
1125 return true;
1126 }
1127
1128 if (Bindings.empty())
1129 return false;
1130
1131 DeclarationName GetDN = S.PP.getIdentifierInfo("get");
1132
1133 // [dcl.decomp]p3:
1134 // The unqualified-id get is looked up in the scope of E by class member
1135 // access lookup ...
1136 LookupResult MemberGet(S, GetDN, Src->getLocation(), Sema::LookupMemberName);
1137 bool UseMemberGet = false;
1138 if (S.isCompleteType(Src->getLocation(), DecompType)) {
1139 if (auto *RD = DecompType->getAsCXXRecordDecl())
1140 S.LookupQualifiedName(MemberGet, RD);
1141 if (MemberGet.isAmbiguous())
1142 return true;
1143 // ... and if that finds at least one declaration that is a function
1144 // template whose first template parameter is a non-type parameter ...
1145 for (NamedDecl *D : MemberGet) {
1146 if (FunctionTemplateDecl *FTD =
1147 dyn_cast<FunctionTemplateDecl>(D->getUnderlyingDecl())) {
1148 TemplateParameterList *TPL = FTD->getTemplateParameters();
1149 if (TPL->size() != 0 &&
1150 isa<NonTypeTemplateParmDecl>(TPL->getParam(0))) {
1151 // ... the initializer is e.get<i>().
1152 UseMemberGet = true;
1153 break;
1154 }
1155 }
1156 }
1157 }
1158
1159 unsigned I = 0;
1160 for (auto *B : Bindings) {
1161 BindingDiagnosticTrap Trap(S, B);
1162 SourceLocation Loc = B->getLocation();
1163
1164 ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc);
1165 if (E.isInvalid())
1166 return true;
1167
1168 // e is an lvalue if the type of the entity is an lvalue reference and
1169 // an xvalue otherwise
1170 if (!Src->getType()->isLValueReferenceType())
1171 E = ImplicitCastExpr::Create(S.Context, E.get()->getType(), CK_NoOp,
1172 E.get(), nullptr, VK_XValue);
1173
1174 TemplateArgumentListInfo Args(Loc, Loc);
1175 Args.addArgument(
1176 getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I));
1177
1178 if (UseMemberGet) {
1179 // if [lookup of member get] finds at least one declaration, the
1180 // initializer is e.get<i-1>().
1181 E = S.BuildMemberReferenceExpr(E.get(), DecompType, Loc, false,
1182 CXXScopeSpec(), SourceLocation(), nullptr,
1183 MemberGet, &Args, nullptr);
1184 if (E.isInvalid())
1185 return true;
1186
1187 E = S.BuildCallExpr(nullptr, E.get(), Loc, None, Loc);
1188 } else {
1189 // Otherwise, the initializer is get<i-1>(e), where get is looked up
1190 // in the associated namespaces.
1191 Expr *Get = UnresolvedLookupExpr::Create(
1192 S.Context, nullptr, NestedNameSpecifierLoc(), SourceLocation(),
1193 DeclarationNameInfo(GetDN, Loc), /*RequiresADL*/true, &Args,
1194 UnresolvedSetIterator(), UnresolvedSetIterator());
1195
1196 Expr *Arg = E.get();
1197 E = S.BuildCallExpr(nullptr, Get, Loc, Arg, Loc);
1198 }
1199 if (E.isInvalid())
1200 return true;
1201 Expr *Init = E.get();
1202
1203 // Given the type T designated by std::tuple_element<i - 1, E>::type,
1204 QualType T = getTupleLikeElementType(S, Loc, I, DecompType);
1205 if (T.isNull())
1206 return true;
1207
1208 // each vi is a variable of type "reference to T" initialized with the
1209 // initializer, where the reference is an lvalue reference if the
1210 // initializer is an lvalue and an rvalue reference otherwise
1211 QualType RefType =
1212 S.BuildReferenceType(T, E.get()->isLValue(), Loc, B->getDeclName());
1213 if (RefType.isNull())
1214 return true;
1215 auto *RefVD = VarDecl::Create(
1216 S.Context, Src->getDeclContext(), Loc, Loc,
1217 B->getDeclName().getAsIdentifierInfo(), RefType,
1218 S.Context.getTrivialTypeSourceInfo(T, Loc), Src->getStorageClass());
1219 RefVD->setLexicalDeclContext(Src->getLexicalDeclContext());
1220 RefVD->setTSCSpec(Src->getTSCSpec());
1221 RefVD->setImplicit();
1222 if (Src->isInlineSpecified())
1223 RefVD->setInlineSpecified();
1224 RefVD->getLexicalDeclContext()->addHiddenDecl(RefVD);
1225
1226 InitializedEntity Entity = InitializedEntity::InitializeBinding(RefVD);
1227 InitializationKind Kind = InitializationKind::CreateCopy(Loc, Loc);
1228 InitializationSequence Seq(S, Entity, Kind, Init);
1229 E = Seq.Perform(S, Entity, Kind, Init);
1230 if (E.isInvalid())
1231 return true;
1232 E = S.ActOnFinishFullExpr(E.get(), Loc, /*DiscardedValue*/ false);
1233 if (E.isInvalid())
1234 return true;
1235 RefVD->setInit(E.get());
1236 if (!E.get()->isValueDependent())
1237 RefVD->checkInitIsICE();
1238
1239 E = S.BuildDeclarationNameExpr(CXXScopeSpec(),
1240 DeclarationNameInfo(B->getDeclName(), Loc),
1241 RefVD);
1242 if (E.isInvalid())
1243 return true;
1244
1245 B->setBinding(T, E.get());
1246 I++;
1247 }
1248
1249 return false;
1250 }
1251
1252 /// Find the base class to decompose in a built-in decomposition of a class type.
1253 /// This base class search is, unfortunately, not quite like any other that we
1254 /// perform anywhere else in C++.
1255 static DeclAccessPair findDecomposableBaseClass(Sema &S, SourceLocation Loc,
1256 const CXXRecordDecl *RD,
1257 CXXCastPath &BasePath) {
1258 auto BaseHasFields = [](const CXXBaseSpecifier *Specifier,
1259 CXXBasePath &Path) {
1260 return Specifier->getType()->getAsCXXRecordDecl()->hasDirectFields();
1261 };
1262
1263 const CXXRecordDecl *ClassWithFields = nullptr;
1264 AccessSpecifier AS = AS_public;
1265 if (RD->hasDirectFields())
1266 // [dcl.decomp]p4:
1267 // Otherwise, all of E's non-static data members shall be public direct
1268 // members of E ...
1269 ClassWithFields = RD;
1270 else {
1271 // ... or of ...
1272 CXXBasePaths Paths;
1273 Paths.setOrigin(const_cast<CXXRecordDecl*>(RD));
1274 if (!RD->lookupInBases(BaseHasFields, Paths)) {
1275 // If no classes have fields, just decompose RD itself. (This will work
1276 // if and only if zero bindings were provided.)
1277 return DeclAccessPair::make(const_cast<CXXRecordDecl*>(RD), AS_public);
1278 }
1279
1280 CXXBasePath *BestPath = nullptr;
1281 for (auto &P : Paths) {
1282 if (!BestPath)
1283 BestPath = &P;
1284 else if (!S.Context.hasSameType(P.back().Base->getType(),
1285 BestPath->back().Base->getType())) {
1286 // ... the same ...
1287 S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members)
1288 << false << RD << BestPath->back().Base->getType()
1289 << P.back().Base->getType();
1290 return DeclAccessPair();
1291 } else if (P.Access < BestPath->Access) {
1292 BestPath = &P;
1293 }
1294 }
1295
1296 // ... unambiguous ...
1297 QualType BaseType = BestPath->back().Base->getType();
1298 if (Paths.isAmbiguous(S.Context.getCanonicalType(BaseType))) {
1299 S.Diag(Loc, diag::err_decomp_decl_ambiguous_base)
1300 << RD << BaseType << S.getAmbiguousPathsDisplayString(Paths);
1301 return DeclAccessPair();
1302 }
1303
1304 // ... [accessible, implied by other rules] base class of E.
1305 S.CheckBaseClassAccess(Loc, BaseType, S.Context.getRecordType(RD),
1306 *BestPath, diag::err_decomp_decl_inaccessible_base);
1307 AS = BestPath->Access;
1308
1309 ClassWithFields = BaseType->getAsCXXRecordDecl();
1310 S.BuildBasePathArray(Paths, BasePath);
1311 }
1312
1313 // The above search did not check whether the selected class itself has base
1314 // classes with fields, so check that now.
1315 CXXBasePaths Paths;
1316 if (ClassWithFields->lookupInBases(BaseHasFields, Paths)) {
1317 S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members)
1318 << (ClassWithFields == RD) << RD << ClassWithFields
1319 << Paths.front().back().Base->getType();
1320 return DeclAccessPair();
1321 }
1322
1323 return DeclAccessPair::make(const_cast<CXXRecordDecl*>(ClassWithFields), AS);
1324 }
1325
1326 static bool checkMemberDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings,
1327 ValueDecl *Src, QualType DecompType,
1328 const CXXRecordDecl *OrigRD) {
1329 if (S.RequireCompleteType(Src->getLocation(), DecompType,
1330 diag::err_incomplete_type))
1331 return true;
1332
1333 CXXCastPath BasePath;
1334 DeclAccessPair BasePair =
1335 findDecomposableBaseClass(S, Src->getLocation(), OrigRD, BasePath);
1336 const CXXRecordDecl *RD = cast_or_null<CXXRecordDecl>(BasePair.getDecl());
1337 if (!RD)
1338 return true;
1339 QualType BaseType = S.Context.getQualifiedType(S.Context.getRecordType(RD),
1340 DecompType.getQualifiers());
1341
1342 auto DiagnoseBadNumberOfBindings = [&]() -> bool {
1343 unsigned NumFields =
1344 std::count_if(RD->field_begin(), RD->field_end(),
1345 [](FieldDecl *FD) { return !FD->isUnnamedBitfield(); });
1346 assert(Bindings.size() != NumFields);
1347 S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings)
1348 << DecompType << (unsigned)Bindings.size() << NumFields
1349 << (NumFields < Bindings.size());
1350 return true;
1351 };
1352
1353 // all of E's non-static data members shall be [...] well-formed
1354 // when named as e.name in the context of the structured binding,
1355 // E shall not have an anonymous union member, ...
1356 unsigned I = 0;
1357 for (auto *FD : RD->fields()) {
1358 if (FD->isUnnamedBitfield())
1359 continue;
1360
1361 if (FD->isAnonymousStructOrUnion()) {
1362 S.Diag(Src->getLocation(), diag::err_decomp_decl_anon_union_member)
1363 << DecompType << FD->getType()->isUnionType();
1364 S.Diag(FD->getLocation(), diag::note_declared_at);
1365 return true;
1366 }
1367
1368 // We have a real field to bind.
1369 if (I >= Bindings.size())
1370 return DiagnoseBadNumberOfBindings();
1371 auto *B = Bindings[I++];
1372 SourceLocation Loc = B->getLocation();
1373
1374 // The field must be accessible in the context of the structured binding.
1375 // We already checked that the base class is accessible.
1376 // FIXME: Add 'const' to AccessedEntity's classes so we can remove the
1377 // const_cast here.
1378 S.CheckStructuredBindingMemberAccess(
1379 Loc, const_cast<CXXRecordDecl *>(OrigRD),
1380 DeclAccessPair::make(FD, CXXRecordDecl::MergeAccess(
1381 BasePair.getAccess(), FD->getAccess())));
1382
1383 // Initialize the binding to Src.FD.
1384 ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc);
1385 if (E.isInvalid())
1386 return true;
1387 E = S.ImpCastExprToType(E.get(), BaseType, CK_UncheckedDerivedToBase,
1388 VK_LValue, &BasePath);
1389 if (E.isInvalid())
1390 return true;
1391 E = S.BuildFieldReferenceExpr(E.get(), /*IsArrow*/ false, Loc,
1392 CXXScopeSpec(), FD,
1393 DeclAccessPair::make(FD, FD->getAccess()),
1394 DeclarationNameInfo(FD->getDeclName(), Loc));
1395 if (E.isInvalid())
1396 return true;
1397
1398 // If the type of the member is T, the referenced type is cv T, where cv is
1399 // the cv-qualification of the decomposition expression.
1400 //
1401 // FIXME: We resolve a defect here: if the field is mutable, we do not add
1402 // 'const' to the type of the field.
1403 Qualifiers Q = DecompType.getQualifiers();
1404 if (FD->isMutable())
1405 Q.removeConst();
1406 B->setBinding(S.BuildQualifiedType(FD->getType(), Loc, Q), E.get());
1407 }
1408
1409 if (I != Bindings.size())
1410 return DiagnoseBadNumberOfBindings();
1411
1412 return false;
1413 }
1414
1415 void Sema::CheckCompleteDecompositionDeclaration(DecompositionDecl *DD) {
1416 QualType DecompType = DD->getType();
1417
1418 // If the type of the decomposition is dependent, then so is the type of
1419 // each binding.
1420 if (DecompType->isDependentType()) {
1421 for (auto *B : DD->bindings())
1422 B->setType(Context.DependentTy);
1423 return;
1424 }
1425
1426 DecompType = DecompType.getNonReferenceType();
1427 ArrayRef<BindingDecl*> Bindings = DD->bindings();
1428
1429 // C++1z [dcl.decomp]/2:
1430 // If E is an array type [...]
1431 // As an extension, we also support decomposition of built-in complex and
1432 // vector types.
1433 if (auto *CAT = Context.getAsConstantArrayType(DecompType)) {
1434 if (checkArrayDecomposition(*this, Bindings, DD, DecompType, CAT))
1435 DD->setInvalidDecl();
1436 return;
1437 }
1438 if (auto *VT = DecompType->getAs<VectorType>()) {
1439 if (checkVectorDecomposition(*this, Bindings, DD, DecompType, VT))
1440 DD->setInvalidDecl();
1441 return;
1442 }
1443 if (auto *CT = DecompType->getAs<ComplexType>()) {
1444 if (checkComplexDecomposition(*this, Bindings, DD, DecompType, CT))
1445 DD->setInvalidDecl();
1446 return;
1447 }
1448
1449 // C++1z [dcl.decomp]/3:
1450 // if the expression std::tuple_size<E>::value is a well-formed integral
1451 // constant expression, [...]
1452 llvm::APSInt TupleSize(32);
1453 switch (isTupleLike(*this, DD->getLocation(), DecompType, TupleSize)) {
1454 case IsTupleLike::Error:
1455 DD->setInvalidDecl();
1456 return;
1457
1458 case IsTupleLike::TupleLike:
1459 if (checkTupleLikeDecomposition(*this, Bindings, DD, DecompType, TupleSize))
1460 DD->setInvalidDecl();
1461 return;
1462
1463 case IsTupleLike::NotTupleLike:
1464 break;
1465 }
1466
1467 // C++1z [dcl.dcl]/8:
1468 // [E shall be of array or non-union class type]
1469 CXXRecordDecl *RD = DecompType->getAsCXXRecordDecl();
1470 if (!RD || RD->isUnion()) {
1471 Diag(DD->getLocation(), diag::err_decomp_decl_unbindable_type)
1472 << DD << !RD << DecompType;
1473 DD->setInvalidDecl();
1474 return;
1475 }
1476
1477 // C++1z [dcl.decomp]/4:
1478 // all of E's non-static data members shall be [...] direct members of
1479 // E or of the same unambiguous public base class of E, ...
1480 if (checkMemberDecomposition(*this, Bindings, DD, DecompType, RD))
1481 DD->setInvalidDecl();
1482 }
1483
1484 /// Merge the exception specifications of two variable declarations.
1485 ///
1486 /// This is called when there's a redeclaration of a VarDecl. The function
1487 /// checks if the redeclaration might have an exception specification and
1488 /// validates compatibility and merges the specs if necessary.
1489 void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) {
1490 // Shortcut if exceptions are disabled.
1491 if (!getLangOpts().CXXExceptions)
1492 return;
1493
1494 assert(Context.hasSameType(New->getType(), Old->getType()) &&
1495 "Should only be called if types are otherwise the same.");
1496
1497 QualType NewType = New->getType();
1498 QualType OldType = Old->getType();
1499
1500 // We're only interested in pointers and references to functions, as well
1501 // as pointers to member functions.
1502 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) {
1503 NewType = R->getPointeeType();
1504 OldType = OldType->castAs<ReferenceType>()->getPointeeType();
1505 } else if (const PointerType *P = NewType->getAs<PointerType>()) {
1506 NewType = P->getPointeeType();
1507 OldType = OldType->castAs<PointerType>()->getPointeeType();
1508 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) {
1509 NewType = M->getPointeeType();
1510 OldType = OldType->castAs<MemberPointerType>()->getPointeeType();
1511 }
1512
1513 if (!NewType->isFunctionProtoType())
1514 return;
1515
1516 // There's lots of special cases for functions. For function pointers, system
1517 // libraries are hopefully not as broken so that we don't need these
1518 // workarounds.
1519 if (CheckEquivalentExceptionSpec(
1520 OldType->getAs<FunctionProtoType>(), Old->getLocation(),
1521 NewType->getAs<FunctionProtoType>(), New->getLocation())) {
1522 New->setInvalidDecl();
1523 }
1524 }
1525
1526 /// CheckCXXDefaultArguments - Verify that the default arguments for a
1527 /// function declaration are well-formed according to C++
1528 /// [dcl.fct.default].
1529 void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) {
1530 unsigned NumParams = FD->getNumParams();
1531 unsigned p;
1532
1533 // Find first parameter with a default argument
1534 for (p = 0; p < NumParams; ++p) {
1535 ParmVarDecl *Param = FD->getParamDecl(p);
1536 if (Param->hasDefaultArg())
1537 break;
1538 }
1539
1540 // C++11 [dcl.fct.default]p4:
1541 // In a given function declaration, each parameter subsequent to a parameter
1542 // with a default argument shall have a default argument supplied in this or
1543 // a previous declaration or shall be a function parameter pack. A default
1544 // argument shall not be redefined by a later declaration (not even to the
1545 // same value).
1546 unsigned LastMissingDefaultArg = 0;
1547 for (; p < NumParams; ++p) {
1548 ParmVarDecl *Param = FD->getParamDecl(p);
1549 if (!Param->hasDefaultArg() && !Param->isParameterPack()) {
1550 if (Param->isInvalidDecl())
1551 /* We already complained about this parameter. */;
1552 else if (Param->getIdentifier())
1553 Diag(Param->getLocation(),
1554 diag::err_param_default_argument_missing_name)
1555 << Param->getIdentifier();
1556 else
1557 Diag(Param->getLocation(),
1558 diag::err_param_default_argument_missing);
1559
1560 LastMissingDefaultArg = p;
1561 }
1562 }
1563
1564 if (LastMissingDefaultArg > 0) {
1565 // Some default arguments were missing. Clear out all of the
1566 // default arguments up to (and including) the last missing
1567 // default argument, so that we leave the function parameters
1568 // in a semantically valid state.
1569 for (p = 0; p <= LastMissingDefaultArg; ++p) {
1570 ParmVarDecl *Param = FD->getParamDecl(p);
1571 if (Param->hasDefaultArg()) {
1572 Param->setDefaultArg(nullptr);
1573 }
1574 }
1575 }
1576 }
1577
1578 /// Check that the given type is a literal type. Issue a diagnostic if not,
1579 /// if Kind is Diagnose.
1580 /// \return \c true if a problem has been found (and optionally diagnosed).
1581 template <typename... Ts>
1582 static bool CheckLiteralType(Sema &SemaRef, Sema::CheckConstexprKind Kind,
1583 SourceLocation Loc, QualType T, unsigned DiagID,
1584 Ts &&...DiagArgs) {
1585 if (T->isDependentType())
1586 return false;
1587
1588 switch (Kind) {
1589 case Sema::CheckConstexprKind::Diagnose:
1590 return SemaRef.RequireLiteralType(Loc, T, DiagID,
1591 std::forward<Ts>(DiagArgs)...);
1592
1593 case Sema::CheckConstexprKind::CheckValid:
1594 return !T->isLiteralType(SemaRef.Context);
1595 }
1596
1597 llvm_unreachable("unknown CheckConstexprKind");
1598 }
1599
1600 /// Determine whether a destructor cannot be constexpr due to
1601 static bool CheckConstexprDestructorSubobjects(Sema &SemaRef,
1602 const CXXDestructorDecl *DD,
1603 Sema::CheckConstexprKind Kind) {
1604 auto Check = [&](SourceLocation Loc, QualType T, const FieldDecl *FD) {
1605 const CXXRecordDecl *RD =
1606 T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
1607 if (!RD || RD->hasConstexprDestructor())
1608 return true;
1609
1610 if (Kind == Sema::CheckConstexprKind::Diagnose) {
1611 SemaRef.Diag(DD->getLocation(), diag::err_constexpr_dtor_subobject)
1612 << DD->getConstexprKind() << !FD
1613 << (FD ? FD->getDeclName() : DeclarationName()) << T;
1614 SemaRef.Diag(Loc, diag::note_constexpr_dtor_subobject)
1615 << !FD << (FD ? FD->getDeclName() : DeclarationName()) << T;
1616 }
1617 return false;
1618 };
1619
1620 const CXXRecordDecl *RD = DD->getParent();
1621 for (const CXXBaseSpecifier &B : RD->bases())
1622 if (!Check(B.getBaseTypeLoc(), B.getType(), nullptr))
1623 return false;
1624 for (const FieldDecl *FD : RD->fields())
1625 if (!Check(FD->getLocation(), FD->getType(), FD))
1626 return false;
1627 return true;
1628 }
1629
1630 /// Check whether a function's parameter types are all literal types. If so,
1631 /// return true. If not, produce a suitable diagnostic and return false.
1632 static bool CheckConstexprParameterTypes(Sema &SemaRef,
1633 const FunctionDecl *FD,
1634 Sema::CheckConstexprKind Kind) {
1635 unsigned ArgIndex = 0;
1636 const auto *FT = FD->getType()->castAs<FunctionProtoType>();
1637 for (FunctionProtoType::param_type_iterator i = FT->param_type_begin(),
1638 e = FT->param_type_end();
1639 i != e; ++i, ++ArgIndex) {
1640 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex);
1641 SourceLocation ParamLoc = PD->getLocation();
1642 if (CheckLiteralType(SemaRef, Kind, ParamLoc, *i,
1643 diag::err_constexpr_non_literal_param, ArgIndex + 1,
1644 PD->getSourceRange(), isa<CXXConstructorDecl>(FD),
1645 FD->isConsteval()))
1646 return false;
1647 }
1648 return true;
1649 }
1650
1651 /// Check whether a function's return type is a literal type. If so, return
1652 /// true. If not, produce a suitable diagnostic and return false.
1653 static bool CheckConstexprReturnType(Sema &SemaRef, const FunctionDecl *FD,
1654 Sema::CheckConstexprKind Kind) {
1655 if (CheckLiteralType(SemaRef, Kind, FD->getLocation(), FD->getReturnType(),
1656 diag::err_constexpr_non_literal_return,
1657 FD->isConsteval()))
1658 return false;
1659 return true;
1660 }
1661
1662 /// Get diagnostic %select index for tag kind for
1663 /// record diagnostic message.
1664 /// WARNING: Indexes apply to particular diagnostics only!
1665 ///
1666 /// \returns diagnostic %select index.
1667 static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) {
1668 switch (Tag) {
1669 case TTK_Struct: return 0;
1670 case TTK_Interface: return 1;
1671 case TTK_Class: return 2;
1672 default: llvm_unreachable("Invalid tag kind for record diagnostic!");
1673 }
1674 }
1675
1676 static bool CheckConstexprFunctionBody(Sema &SemaRef, const FunctionDecl *Dcl,
1677 Stmt *Body,
1678 Sema::CheckConstexprKind Kind);
1679
1680 // Check whether a function declaration satisfies the requirements of a
1681 // constexpr function definition or a constexpr constructor definition. If so,
1682 // return true. If not, produce appropriate diagnostics (unless asked not to by
1683 // Kind) and return false.
1684 //
1685 // This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360.
1686 bool Sema::CheckConstexprFunctionDefinition(const FunctionDecl *NewFD,
1687 CheckConstexprKind Kind) {
1688 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
1689 if (MD && MD->isInstance()) {
1690 // C++11 [dcl.constexpr]p4:
1691 // The definition of a constexpr constructor shall satisfy the following
1692 // constraints:
1693 // - the class shall not have any virtual base classes;
1694 //
1695 // FIXME: This only applies to constructors and destructors, not arbitrary
1696 // member functions.
1697 const CXXRecordDecl *RD = MD->getParent();
1698 if (RD->getNumVBases()) {
1699 if (Kind == CheckConstexprKind::CheckValid)
1700 return false;
1701
1702 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base)
1703 << isa<CXXConstructorDecl>(NewFD)
1704 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases();
1705 for (const auto &I : RD->vbases())
1706 Diag(I.getBeginLoc(), diag::note_constexpr_virtual_base_here)
1707 << I.getSourceRange();
1708 return false;
1709 }
1710 }
1711
1712 if (!isa<CXXConstructorDecl>(NewFD)) {
1713 // C++11 [dcl.constexpr]p3:
1714 // The definition of a constexpr function shall satisfy the following
1715 // constraints:
1716 // - it shall not be virtual; (removed in C++20)
1717 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD);
1718 if (Method && Method->isVirtual()) {
1719 if (getLangOpts().CPlusPlus2a) {
1720 if (Kind == CheckConstexprKind::Diagnose)
1721 Diag(Method->getLocation(), diag::warn_cxx17_compat_constexpr_virtual);
1722 } else {
1723 if (Kind == CheckConstexprKind::CheckValid)
1724 return false;
1725
1726 Method = Method->getCanonicalDecl();
1727 Diag(Method->getLocation(), diag::err_constexpr_virtual);
1728
1729 // If it's not obvious why this function is virtual, find an overridden
1730 // function which uses the 'virtual' keyword.
1731 const CXXMethodDecl *WrittenVirtual = Method;
1732 while (!WrittenVirtual->isVirtualAsWritten())
1733 WrittenVirtual = *WrittenVirtual->begin_overridden_methods();
1734 if (WrittenVirtual != Method)
1735 Diag(WrittenVirtual->getLocation(),
1736 diag::note_overridden_virtual_function);
1737 return false;
1738 }
1739 }
1740
1741 // - its return type shall be a literal type;
1742 if (!CheckConstexprReturnType(*this, NewFD, Kind))
1743 return false;
1744 }
1745
1746 if (auto *Dtor = dyn_cast<CXXDestructorDecl>(NewFD)) {
1747 // A destructor can be constexpr only if the defaulted destructor could be;
1748 // we don't need to check the members and bases if we already know they all
1749 // have constexpr destructors.
1750 if (!Dtor->getParent()->defaultedDestructorIsConstexpr()) {
1751 if (Kind == CheckConstexprKind::CheckValid)
1752 return false;
1753 if (!CheckConstexprDestructorSubobjects(*this, Dtor, Kind))
1754 return false;
1755 }
1756 }
1757
1758 // - each of its parameter types shall be a literal type;
1759 if (!CheckConstexprParameterTypes(*this, NewFD, Kind))
1760 return false;
1761
1762 Stmt *Body = NewFD->getBody();
1763 assert(Body &&
1764 "CheckConstexprFunctionDefinition called on function with no body");
1765 return CheckConstexprFunctionBody(*this, NewFD, Body, Kind);
1766 }
1767
1768 /// Check the given declaration statement is legal within a constexpr function
1769 /// body. C++11 [dcl.constexpr]p3,p4, and C++1y [dcl.constexpr]p3.
1770 ///
1771 /// \return true if the body is OK (maybe only as an extension), false if we
1772 /// have diagnosed a problem.
1773 static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl,
1774 DeclStmt *DS, SourceLocation &Cxx1yLoc,
1775 Sema::CheckConstexprKind Kind) {
1776 // C++11 [dcl.constexpr]p3 and p4:
1777 // The definition of a constexpr function(p3) or constructor(p4) [...] shall
1778 // contain only
1779 for (const auto *DclIt : DS->decls()) {
1780 switch (DclIt->getKind()) {
1781 case Decl::StaticAssert:
1782 case Decl::Using:
1783 case Decl::UsingShadow:
1784 case Decl::UsingDirective:
1785 case Decl::UnresolvedUsingTypename:
1786 case Decl::UnresolvedUsingValue:
1787 // - static_assert-declarations
1788 // - using-declarations,
1789 // - using-directives,
1790 continue;
1791
1792 case Decl::Typedef:
1793 case Decl::TypeAlias: {
1794 // - typedef declarations and alias-declarations that do not define
1795 // classes or enumerations,
1796 const auto *TN = cast<TypedefNameDecl>(DclIt);
1797 if (TN->getUnderlyingType()->isVariablyModifiedType()) {
1798 // Don't allow variably-modified types in constexpr functions.
1799 if (Kind == Sema::CheckConstexprKind::Diagnose) {
1800 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc();
1801 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla)
1802 << TL.getSourceRange() << TL.getType()
1803 << isa<CXXConstructorDecl>(Dcl);
1804 }
1805 return false;
1806 }
1807 continue;
1808 }
1809
1810 case Decl::Enum:
1811 case Decl::CXXRecord:
1812 // C++1y allows types to be defined, not just declared.
1813 if (cast<TagDecl>(DclIt)->isThisDeclarationADefinition()) {
1814 if (Kind == Sema::CheckConstexprKind::Diagnose) {
1815 SemaRef.Diag(DS->getBeginLoc(),
1816 SemaRef.getLangOpts().CPlusPlus14
1817 ? diag::warn_cxx11_compat_constexpr_type_definition
1818 : diag::ext_constexpr_type_definition)
1819 << isa<CXXConstructorDecl>(Dcl);
1820 } else if (!SemaRef.getLangOpts().CPlusPlus14) {
1821 return false;
1822 }
1823 }
1824 continue;
1825
1826 case Decl::EnumConstant:
1827 case Decl::IndirectField:
1828 case Decl::ParmVar:
1829 // These can only appear with other declarations which are banned in
1830 // C++11 and permitted in C++1y, so ignore them.
1831 continue;
1832
1833 case Decl::Var:
1834 case Decl::Decomposition: {
1835 // C++1y [dcl.constexpr]p3 allows anything except:
1836 // a definition of a variable of non-literal type or of static or
1837 // thread storage duration or [before C++2a] for which no
1838 // initialization is performed.
1839 const auto *VD = cast<VarDecl>(DclIt);
1840 if (VD->isThisDeclarationADefinition()) {
1841 if (VD->isStaticLocal()) {
1842 if (Kind == Sema::CheckConstexprKind::Diagnose) {
1843 SemaRef.Diag(VD->getLocation(),
1844 diag::err_constexpr_local_var_static)
1845 << isa<CXXConstructorDecl>(Dcl)
1846 << (VD->getTLSKind() == VarDecl::TLS_Dynamic);
1847 }
1848 return false;
1849 }
1850 if (CheckLiteralType(SemaRef, Kind, VD->getLocation(), VD->getType(),
1851 diag::err_constexpr_local_var_non_literal_type,
1852 isa<CXXConstructorDecl>(Dcl)))
1853 return false;
1854 if (!VD->getType()->isDependentType() &&
1855 !VD->hasInit() && !VD->isCXXForRangeDecl()) {
1856 if (Kind == Sema::CheckConstexprKind::Diagnose) {
1857 SemaRef.Diag(
1858 VD->getLocation(),
1859 SemaRef.getLangOpts().CPlusPlus2a
1860 ? diag::warn_cxx17_compat_constexpr_local_var_no_init
1861 : diag::ext_constexpr_local_var_no_init)
1862 << isa<CXXConstructorDecl>(Dcl);
1863 } else if (!SemaRef.getLangOpts().CPlusPlus2a) {
1864 return false;
1865 }
1866 continue;
1867 }
1868 }
1869 if (Kind == Sema::CheckConstexprKind::Diagnose) {
1870 SemaRef.Diag(VD->getLocation(),
1871 SemaRef.getLangOpts().CPlusPlus14
1872 ? diag::warn_cxx11_compat_constexpr_local_var
1873 : diag::ext_constexpr_local_var)
1874 << isa<CXXConstructorDecl>(Dcl);
1875 } else if (!SemaRef.getLangOpts().CPlusPlus14) {
1876 return false;
1877 }
1878 continue;
1879 }
1880
1881 case Decl::NamespaceAlias:
1882 case Decl::Function:
1883 // These are disallowed in C++11 and permitted in C++1y. Allow them
1884 // everywhere as an extension.
1885 if (!Cxx1yLoc.isValid())
1886 Cxx1yLoc = DS->getBeginLoc();
1887 continue;
1888
1889 default:
1890 if (Kind == Sema::CheckConstexprKind::Diagnose) {
1891 SemaRef.Diag(DS->getBeginLoc(), diag::err_constexpr_body_invalid_stmt)
1892 << isa<CXXConstructorDecl>(Dcl) << Dcl->isConsteval();
1893 }
1894 return false;
1895 }
1896 }
1897
1898 return true;
1899 }
1900
1901 /// Check that the given field is initialized within a constexpr constructor.
1902 ///
1903 /// \param Dcl The constexpr constructor being checked.
1904 /// \param Field The field being checked. This may be a member of an anonymous
1905 /// struct or union nested within the class being checked.
1906 /// \param Inits All declarations, including anonymous struct/union members and
1907 /// indirect members, for which any initialization was provided.
1908 /// \param Diagnosed Whether we've emitted the error message yet. Used to attach
1909 /// multiple notes for different members to the same error.
1910 /// \param Kind Whether we're diagnosing a constructor as written or determining
1911 /// whether the formal requirements are satisfied.
1912 /// \return \c false if we're checking for validity and the constructor does
1913 /// not satisfy the requirements on a constexpr constructor.
1914 static bool CheckConstexprCtorInitializer(Sema &SemaRef,
1915 const FunctionDecl *Dcl,
1916 FieldDecl *Field,
1917 llvm::SmallSet<Decl*, 16> &Inits,
1918 bool &Diagnosed,
1919 Sema::CheckConstexprKind Kind) {
1920 // In C++20 onwards, there's nothing to check for validity.
1921 if (Kind == Sema::CheckConstexprKind::CheckValid &&
1922 SemaRef.getLangOpts().CPlusPlus2a)
1923 return true;
1924
1925 if (Field->isInvalidDecl())
1926 return true;
1927
1928 if (Field->isUnnamedBitfield())
1929 return true;
1930
1931 // Anonymous unions with no variant members and empty anonymous structs do not
1932 // need to be explicitly initialized. FIXME: Anonymous structs that contain no
1933 // indirect fields don't need initializing.
1934 if (Field->isAnonymousStructOrUnion() &&
1935 (Field->getType()->isUnionType()
1936 ? !Field->getType()->getAsCXXRecordDecl()->hasVariantMembers()
1937 : Field->getType()->getAsCXXRecordDecl()->isEmpty()))
1938 return true;
1939
1940 if (!Inits.count(Field)) {
1941 if (Kind == Sema::CheckConstexprKind::Diagnose) {
1942 if (!Diagnosed) {
1943 SemaRef.Diag(Dcl->getLocation(),
1944 SemaRef.getLangOpts().CPlusPlus2a
1945 ? diag::warn_cxx17_compat_constexpr_ctor_missing_init
1946 : diag::ext_constexpr_ctor_missing_init);
1947 Diagnosed = true;
1948 }
1949 SemaRef.Diag(Field->getLocation(),
1950 diag::note_constexpr_ctor_missing_init);
1951 } else if (!SemaRef.getLangOpts().CPlusPlus2a) {
1952 return false;
1953 }
1954 } else if (Field->isAnonymousStructOrUnion()) {
1955 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl();
1956 for (auto *I : RD->fields())
1957 // If an anonymous union contains an anonymous struct of which any member
1958 // is initialized, all members must be initialized.
1959 if (!RD->isUnion() || Inits.count(I))
1960 if (!CheckConstexprCtorInitializer(SemaRef, Dcl, I, Inits, Diagnosed,
1961 Kind))
1962 return false;
1963 }
1964 return true;
1965 }
1966
1967 /// Check the provided statement is allowed in a constexpr function
1968 /// definition.
1969 static bool
1970 CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S,
1971 SmallVectorImpl<SourceLocation> &ReturnStmts,
1972 SourceLocation &Cxx1yLoc, SourceLocation &Cxx2aLoc,
1973 Sema::CheckConstexprKind Kind) {
1974 // - its function-body shall be [...] a compound-statement that contains only
1975 switch (S->getStmtClass()) {
1976 case Stmt::NullStmtClass:
1977 // - null statements,
1978 return true;
1979
1980 case Stmt::DeclStmtClass:
1981 // - static_assert-declarations
1982 // - using-declarations,
1983 // - using-directives,
1984 // - typedef declarations and alias-declarations that do not define
1985 // classes or enumerations,
1986 if (!CheckConstexprDeclStmt(SemaRef, Dcl, cast<DeclStmt>(S), Cxx1yLoc, Kind))
1987 return false;
1988 return true;
1989
1990 case Stmt::ReturnStmtClass:
1991 // - and exactly one return statement;
1992 if (isa<CXXConstructorDecl>(Dcl)) {
1993 // C++1y allows return statements in constexpr constructors.
1994 if (!Cxx1yLoc.isValid())
1995 Cxx1yLoc = S->getBeginLoc();
1996 return true;
1997 }
1998
1999 ReturnStmts.push_back(S->getBeginLoc());
2000 return true;
2001
2002 case Stmt::CompoundStmtClass: {
2003 // C++1y allows compound-statements.
2004 if (!Cxx1yLoc.isValid())
2005 Cxx1yLoc = S->getBeginLoc();
2006
2007 CompoundStmt *CompStmt = cast<CompoundStmt>(S);
2008 for (auto *BodyIt : CompStmt->body()) {
2009 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, BodyIt, ReturnStmts,
2010 Cxx1yLoc, Cxx2aLoc, Kind))
2011 return false;
2012 }
2013 return true;
2014 }
2015
2016 case Stmt::AttributedStmtClass:
2017 if (!Cxx1yLoc.isValid())
2018 Cxx1yLoc = S->getBeginLoc();
2019 return true;
2020
2021 case Stmt::IfStmtClass: {
2022 // C++1y allows if-statements.
2023 if (!Cxx1yLoc.isValid())
2024 Cxx1yLoc = S->getBeginLoc();
2025
2026 IfStmt *If = cast<IfStmt>(S);
2027 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, If->getThen(), ReturnStmts,
2028 Cxx1yLoc, Cxx2aLoc, Kind))
2029 return false;
2030 if (If->getElse() &&
2031 !CheckConstexprFunctionStmt(SemaRef, Dcl, If->getElse(), ReturnStmts,
2032 Cxx1yLoc, Cxx2aLoc, Kind))
2033 return false;
2034 return true;
2035 }
2036
2037 case Stmt::WhileStmtClass:
2038 case Stmt::DoStmtClass:
2039 case Stmt::ForStmtClass:
2040 case Stmt::CXXForRangeStmtClass:
2041 case Stmt::ContinueStmtClass:
2042 // C++1y allows all of these. We don't allow them as extensions in C++11,
2043 // because they don't make sense without variable mutation.
2044 if (!SemaRef.getLangOpts().CPlusPlus14)
2045 break;
2046 if (!Cxx1yLoc.isValid())
2047 Cxx1yLoc = S->getBeginLoc();
2048 for (Stmt *SubStmt : S->children())
2049 if (SubStmt &&
2050 !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts,
2051 Cxx1yLoc, Cxx2aLoc, Kind))
2052 return false;
2053 return true;
2054
2055 case Stmt::SwitchStmtClass:
2056 case Stmt::CaseStmtClass:
2057 case Stmt::DefaultStmtClass:
2058 case Stmt::BreakStmtClass:
2059 // C++1y allows switch-statements, and since they don't need variable
2060 // mutation, we can reasonably allow them in C++11 as an extension.
2061 if (!Cxx1yLoc.isValid())
2062 Cxx1yLoc = S->getBeginLoc();
2063 for (Stmt *SubStmt : S->children())
2064 if (SubStmt &&
2065 !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts,
2066 Cxx1yLoc, Cxx2aLoc, Kind))
2067 return false;
2068 return true;
2069
2070 case Stmt::GCCAsmStmtClass:
2071 case Stmt::MSAsmStmtClass:
2072 // C++2a allows inline assembly statements.
2073 case Stmt::CXXTryStmtClass:
2074 if (Cxx2aLoc.isInvalid())
2075 Cxx2aLoc = S->getBeginLoc();
2076 for (Stmt *SubStmt : S->children()) {
2077 if (SubStmt &&
2078 !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts,
2079 Cxx1yLoc, Cxx2aLoc, Kind))
2080 return false;
2081 }
2082 return true;
2083
2084 case Stmt::CXXCatchStmtClass:
2085 // Do not bother checking the language mode (already covered by the
2086 // try block check).
2087 if (!CheckConstexprFunctionStmt(SemaRef, Dcl,
2088 cast<CXXCatchStmt>(S)->getHandlerBlock(),
2089 ReturnStmts, Cxx1yLoc, Cxx2aLoc, Kind))
2090 return false;
2091 return true;
2092
2093 default:
2094 if (!isa<Expr>(S))
2095 break;
2096
2097 // C++1y allows expression-statements.
2098 if (!Cxx1yLoc.isValid())
2099 Cxx1yLoc = S->getBeginLoc();
2100 return true;
2101 }
2102
2103 if (Kind == Sema::CheckConstexprKind::Diagnose) {
2104 SemaRef.Diag(S->getBeginLoc(), diag::err_constexpr_body_invalid_stmt)
2105 << isa<CXXConstructorDecl>(Dcl) << Dcl->isConsteval();
2106 }
2107 return false;
2108 }
2109
2110 /// Check the body for the given constexpr function declaration only contains
2111 /// the permitted types of statement. C++11 [dcl.constexpr]p3,p4.
2112 ///
2113 /// \return true if the body is OK, false if we have found or diagnosed a
2114 /// problem.
2115 static bool CheckConstexprFunctionBody(Sema &SemaRef, const FunctionDecl *Dcl,
2116 Stmt *Body,
2117 Sema::CheckConstexprKind Kind) {
2118 SmallVector<SourceLocation, 4> ReturnStmts;
2119
2120 if (isa<CXXTryStmt>(Body)) {
2121 // C++11 [dcl.constexpr]p3:
2122 // The definition of a constexpr function shall satisfy the following
2123 // constraints: [...]
2124 // - its function-body shall be = delete, = default, or a
2125 // compound-statement
2126 //
2127 // C++11 [dcl.constexpr]p4:
2128 // In the definition of a constexpr constructor, [...]
2129 // - its function-body shall not be a function-try-block;
2130 //
2131 // This restriction is lifted in C++2a, as long as inner statements also
2132 // apply the general constexpr rules.
2133 switch (Kind) {
2134 case Sema::CheckConstexprKind::CheckValid:
2135 if (!SemaRef.getLangOpts().CPlusPlus2a)
2136 return false;
2137 break;
2138
2139 case Sema::CheckConstexprKind::Diagnose:
2140 SemaRef.Diag(Body->getBeginLoc(),
2141 !SemaRef.getLangOpts().CPlusPlus2a
2142 ? diag::ext_constexpr_function_try_block_cxx2a
2143 : diag::warn_cxx17_compat_constexpr_function_try_block)
2144 << isa<CXXConstructorDecl>(Dcl);
2145 break;
2146 }
2147 }
2148
2149 // - its function-body shall be [...] a compound-statement that contains only
2150 // [... list of cases ...]
2151 //
2152 // Note that walking the children here is enough to properly check for
2153 // CompoundStmt and CXXTryStmt body.
2154 SourceLocation Cxx1yLoc, Cxx2aLoc;
2155 for (Stmt *SubStmt : Body->children()) {
2156 if (SubStmt &&
2157 !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts,
2158 Cxx1yLoc, Cxx2aLoc, Kind))
2159 return false;
2160 }
2161
2162 if (Kind == Sema::CheckConstexprKind::CheckValid) {
2163 // If this is only valid as an extension, report that we don't satisfy the
2164 // constraints of the current language.
2165 if ((Cxx2aLoc.isValid() && !SemaRef.getLangOpts().CPlusPlus2a) ||
2166 (Cxx1yLoc.isValid() && !SemaRef.getLangOpts().CPlusPlus17))
2167 return false;
2168 } else if (Cxx2aLoc.isValid()) {
2169 SemaRef.Diag(Cxx2aLoc,
2170 SemaRef.getLangOpts().CPlusPlus2a
2171 ? diag::warn_cxx17_compat_constexpr_body_invalid_stmt
2172 : diag::ext_constexpr_body_invalid_stmt_cxx2a)
2173 << isa<CXXConstructorDecl>(Dcl);
2174 } else if (Cxx1yLoc.isValid()) {
2175 SemaRef.Diag(Cxx1yLoc,
2176 SemaRef.getLangOpts().CPlusPlus14
2177 ? diag::warn_cxx11_compat_constexpr_body_invalid_stmt
2178 : diag::ext_constexpr_body_invalid_stmt)
2179 << isa<CXXConstructorDecl>(Dcl);
2180 }
2181
2182 if (const CXXConstructorDecl *Constructor
2183 = dyn_cast<CXXConstructorDecl>(Dcl)) {
2184 const CXXRecordDecl *RD = Constructor->getParent();
2185 // DR1359:
2186 // - every non-variant non-static data member and base class sub-object
2187 // shall be initialized;
2188 // DR1460:
2189 // - if the class is a union having variant members, exactly one of them
2190 // shall be initialized;
2191 if (RD->isUnion()) {
2192 if (Constructor->getNumCtorInitializers() == 0 &&
2193 RD->hasVariantMembers()) {
2194 if (Kind == Sema::CheckConstexprKind::Diagnose) {
2195 SemaRef.Diag(
2196 Dcl->getLocation(),
2197 SemaRef.getLangOpts().CPlusPlus2a
2198 ? diag::warn_cxx17_compat_constexpr_union_ctor_no_init
2199 : diag::ext_constexpr_union_ctor_no_init);
2200 } else if (!SemaRef.getLangOpts().CPlusPlus2a) {
2201 return false;
2202 }
2203 }
2204 } else if (!Constructor->isDependentContext() &&
2205 !Constructor->isDelegatingConstructor()) {
2206 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases");
2207
2208 // Skip detailed checking if we have enough initializers, and we would
2209 // allow at most one initializer per member.
2210 bool AnyAnonStructUnionMembers = false;
2211 unsigned Fields = 0;
2212 for (CXXRecordDecl::field_iterator I = RD->field_begin(),
2213 E = RD->field_end(); I != E; ++I, ++Fields) {
2214 if (I->isAnonymousStructOrUnion()) {
2215 AnyAnonStructUnionMembers = true;
2216 break;
2217 }
2218 }
2219 // DR1460:
2220 // - if the class is a union-like class, but is not a union, for each of
2221 // its anonymous union members having variant members, exactly one of
2222 // them shall be initialized;
2223 if (AnyAnonStructUnionMembers ||
2224 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) {
2225 // Check initialization of non-static data members. Base classes are
2226 // always initialized so do not need to be checked. Dependent bases
2227 // might not have initializers in the member initializer list.
2228 llvm::SmallSet<Decl*, 16> Inits;
2229 for (const auto *I: Constructor->inits()) {
2230 if (FieldDecl *FD = I->getMember())
2231 Inits.insert(FD);
2232 else if (IndirectFieldDecl *ID = I->getIndirectMember())
2233 Inits.insert(ID->chain_begin(), ID->chain_end());
2234 }
2235
2236 bool Diagnosed = false;
2237 for (auto *I : RD->fields())
2238 if (!CheckConstexprCtorInitializer(SemaRef, Dcl, I, Inits, Diagnosed,
2239 Kind))
2240 return false;
2241 }
2242 }
2243 } else {
2244 if (ReturnStmts.empty()) {
2245 // C++1y doesn't require constexpr functions to contain a 'return'
2246 // statement. We still do, unless the return type might be void, because
2247 // otherwise if there's no return statement, the function cannot
2248 // be used in a core constant expression.
2249 bool OK = SemaRef.getLangOpts().CPlusPlus14 &&
2250 (Dcl->getReturnType()->isVoidType() ||
2251 Dcl->getReturnType()->isDependentType());
2252 switch (Kind) {
2253 case Sema::CheckConstexprKind::Diagnose:
2254 SemaRef.Diag(Dcl->getLocation(),
2255 OK ? diag::warn_cxx11_compat_constexpr_body_no_return
2256 : diag::err_constexpr_body_no_return)
2257 << Dcl->isConsteval();
2258 if (!OK)
2259 return false;
2260 break;
2261
2262 case Sema::CheckConstexprKind::CheckValid:
2263 // The formal requirements don't include this rule in C++14, even
2264 // though the "must be able to produce a constant expression" rules
2265 // still imply it in some cases.
2266 if (!SemaRef.getLangOpts().CPlusPlus14)
2267 return false;
2268 break;
2269 }
2270 } else if (ReturnStmts.size() > 1) {
2271 switch (Kind) {
2272 case Sema::CheckConstexprKind::Diagnose:
2273 SemaRef.Diag(
2274 ReturnStmts.back(),
2275 SemaRef.getLangOpts().CPlusPlus14
2276 ? diag::warn_cxx11_compat_constexpr_body_multiple_return
2277 : diag::ext_constexpr_body_multiple_return);
2278 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I)
2279 SemaRef.Diag(ReturnStmts[I],
2280 diag::note_constexpr_body_previous_return);
2281 break;
2282
2283 case Sema::CheckConstexprKind::CheckValid:
2284 if (!SemaRef.getLangOpts().CPlusPlus14)
2285 return false;
2286 break;
2287 }
2288 }
2289 }
2290
2291 // C++11 [dcl.constexpr]p5:
2292 // if no function argument values exist such that the function invocation
2293 // substitution would produce a constant expression, the program is
2294 // ill-formed; no diagnostic required.
2295 // C++11 [dcl.constexpr]p3:
2296 // - every constructor call and implicit conversion used in initializing the
2297 // return value shall be one of those allowed in a constant expression.
2298 // C++11 [dcl.constexpr]p4:
2299 // - every constructor involved in initializing non-static data members and
2300 // base class sub-objects shall be a constexpr constructor.
2301 //
2302 // Note that this rule is distinct from the "requirements for a constexpr
2303 // function", so is not checked in CheckValid mode.
2304 SmallVector<PartialDiagnosticAt, 8> Diags;
2305 if (Kind == Sema::CheckConstexprKind::Diagnose &&
2306 !Expr::isPotentialConstantExpr(Dcl, Diags)) {
2307 SemaRef.Diag(Dcl->getLocation(),
2308 diag::ext_constexpr_function_never_constant_expr)
2309 << isa<CXXConstructorDecl>(Dcl);
2310 for (size_t I = 0, N = Diags.size(); I != N; ++I)
2311 SemaRef.Diag(Diags[I].first, Diags[I].second);
2312 // Don't return false here: we allow this for compatibility in
2313 // system headers.
2314 }
2315
2316 return true;
2317 }
2318
2319 /// Get the class that is directly named by the current context. This is the
2320 /// class for which an unqualified-id in this scope could name a constructor
2321 /// or destructor.
2322 ///
2323 /// If the scope specifier denotes a class, this will be that class.
2324 /// If the scope specifier is empty, this will be the class whose
2325 /// member-specification we are currently within. Otherwise, there
2326 /// is no such class.
2327 CXXRecordDecl *Sema::getCurrentClass(Scope *, const CXXScopeSpec *SS) {
2328 assert(getLangOpts().CPlusPlus && "No class names in C!");
2329
2330 if (SS && SS->isInvalid())
2331 return nullptr;
2332
2333 if (SS && SS->isNotEmpty()) {
2334 DeclContext *DC = computeDeclContext(*SS, true);
2335 return dyn_cast_or_null<CXXRecordDecl>(DC);
2336 }
2337
2338 return dyn_cast_or_null<CXXRecordDecl>(CurContext);
2339 }
2340
2341 /// isCurrentClassName - Determine whether the identifier II is the
2342 /// name of the class type currently being defined. In the case of
2343 /// nested classes, this will only return true if II is the name of
2344 /// the innermost class.
2345 bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *S,
2346 const CXXScopeSpec *SS) {
2347 CXXRecordDecl *CurDecl = getCurrentClass(S, SS);
2348 return CurDecl && &II == CurDecl->getIdentifier();
2349 }
2350
2351 /// Determine whether the identifier II is a typo for the name of
2352 /// the class type currently being defined. If so, update it to the identifier
2353 /// that should have been used.
2354 bool Sema::isCurrentClassNameTypo(IdentifierInfo *&II, const CXXScopeSpec *SS) {
2355 assert(getLangOpts().CPlusPlus && "No class names in C!");
2356
2357 if (!getLangOpts().SpellChecking)
2358 return false;
2359
2360 CXXRecordDecl *CurDecl;
2361 if (SS && SS->isSet() && !SS->isInvalid()) {
2362 DeclContext *DC = computeDeclContext(*SS, true);
2363 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC);
2364 } else
2365 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext);
2366
2367 if (CurDecl && CurDecl->getIdentifier() && II != CurDecl->getIdentifier() &&
2368 3 * II->getName().edit_distance(CurDecl->getIdentifier()->getName())
2369 < II->getLength()) {
2370 II = CurDecl->getIdentifier();
2371 return true;
2372 }
2373
2374 return false;
2375 }
2376
2377 /// Determine whether the given class is a base class of the given
2378 /// class, including looking at dependent bases.
2379 static bool findCircularInheritance(const CXXRecordDecl *Class,
2380 const CXXRecordDecl *Current) {
2381 SmallVector<const CXXRecordDecl*, 8> Queue;
2382
2383 Class = Class->getCanonicalDecl();
2384 while (true) {
2385 for (const auto &I : Current->bases()) {
2386 CXXRecordDecl *Base = I.getType()->getAsCXXRecordDecl();
2387 if (!Base)
2388 continue;
2389
2390 Base = Base->getDefinition();
2391 if (!Base)
2392 continue;
2393
2394 if (Base->getCanonicalDecl() == Class)
2395 return true;
2396
2397 Queue.push_back(Base);
2398 }
2399
2400 if (Queue.empty())
2401 return false;
2402
2403 Current = Queue.pop_back_val();
2404 }
2405
2406 return false;
2407 }
2408
2409 /// Check the validity of a C++ base class specifier.
2410 ///
2411 /// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics
2412 /// and returns NULL otherwise.
2413 CXXBaseSpecifier *
2414 Sema::CheckBaseSpecifier(CXXRecordDecl *Class,
2415 SourceRange SpecifierRange,
2416 bool Virtual, AccessSpecifier Access,
2417 TypeSourceInfo *TInfo,
2418 SourceLocation EllipsisLoc) {
2419 QualType BaseType = TInfo->getType();
2420
2421 // C++ [class.union]p1:
2422 // A union shall not have base classes.
2423 if (Class->isUnion()) {
2424 Diag(Class->getLocation(), diag::err_base_clause_on_union)
2425 << SpecifierRange;
2426 return nullptr;
2427 }
2428
2429 if (EllipsisLoc.isValid() &&
2430 !TInfo->getType()->containsUnexpandedParameterPack()) {
2431 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
2432 << TInfo->getTypeLoc().getSourceRange();
2433 EllipsisLoc = SourceLocation();
2434 }
2435
2436 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc();
2437
2438 if (BaseType->isDependentType()) {
2439 // Make sure that we don't have circular inheritance among our dependent
2440 // bases. For non-dependent bases, the check for completeness below handles
2441 // this.
2442 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) {
2443 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() ||
2444 ((BaseDecl = BaseDecl->getDefinition()) &&
2445 findCircularInheritance(Class, BaseDecl))) {
2446 Diag(BaseLoc, diag::err_circular_inheritance)
2447 << BaseType << Context.getTypeDeclType(Class);
2448
2449 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl())
2450 Diag(BaseDecl->getLocation(), diag::note_previous_decl)
2451 << BaseType;
2452
2453 return nullptr;
2454 }
2455 }
2456
2457 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
2458 Class->getTagKind() == TTK_Class,
2459 Access, TInfo, EllipsisLoc);
2460 }
2461
2462 // Base specifiers must be record types.
2463 if (!BaseType->isRecordType()) {
2464 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange;
2465 return nullptr;
2466 }
2467
2468 // C++ [class.union]p1:
2469 // A union shall not be used as a base class.
2470 if (BaseType->isUnionType()) {
2471 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange;
2472 return nullptr;
2473 }
2474
2475 // For the MS ABI, propagate DLL attributes to base class templates.
2476 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
2477 if (Attr *ClassAttr = getDLLAttr(Class)) {
2478 if (auto *BaseTemplate = dyn_cast_or_null<ClassTemplateSpecializationDecl>(
2479 BaseType->getAsCXXRecordDecl())) {
2480 propagateDLLAttrToBaseClassTemplate(Class, ClassAttr, BaseTemplate,
2481 BaseLoc);
2482 }
2483 }
2484 }
2485
2486 // C++ [class.derived]p2:
2487 // The class-name in a base-specifier shall not be an incompletely
2488 // defined class.
2489 if (RequireCompleteType(BaseLoc, BaseType,
2490 diag::err_incomplete_base_class, SpecifierRange)) {
2491 Class->setInvalidDecl();
2492 return nullptr;
2493 }
2494
2495 // If the base class is polymorphic or isn't empty, the new one is/isn't, too.
2496 RecordDecl *BaseDecl = BaseType->castAs<RecordType>()->getDecl();
2497 assert(BaseDecl && "Record type has no declaration");
2498 BaseDecl = BaseDecl->getDefinition();
2499 assert(BaseDecl && "Base type is not incomplete, but has no definition");
2500 CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl);
2501 assert(CXXBaseDecl && "Base type is not a C++ type");
2502
2503 // Microsoft docs say:
2504 // "If a base-class has a code_seg attribute, derived classes must have the
2505 // same attribute."
2506 const auto *BaseCSA = CXXBaseDecl->getAttr<CodeSegAttr>();
2507 const auto *DerivedCSA = Class->getAttr<CodeSegAttr>();
2508 if ((DerivedCSA || BaseCSA) &&
2509 (!BaseCSA || !DerivedCSA || BaseCSA->getName() != DerivedCSA->getName())) {
2510 Diag(Class->getLocation(), diag::err_mismatched_code_seg_base);
2511 Diag(CXXBaseDecl->getLocation(), diag::note_base_class_specified_here)
2512 << CXXBaseDecl;
2513 return nullptr;
2514 }
2515
2516 // A class which contains a flexible array member is not suitable for use as a
2517 // base class:
2518 // - If the layout determines that a base comes before another base,
2519 // the flexible array member would index into the subsequent base.
2520 // - If the layout determines that base comes before the derived class,
2521 // the flexible array member would index into the derived class.
2522 if (CXXBaseDecl->hasFlexibleArrayMember()) {
2523 Diag(BaseLoc, diag::err_base_class_has_flexible_array_member)
2524 << CXXBaseDecl->getDeclName();
2525 return nullptr;
2526 }
2527
2528 // C++ [class]p3:
2529 // If a class is marked final and it appears as a base-type-specifier in
2530 // base-clause, the program is ill-formed.
2531 if (FinalAttr *FA = CXXBaseDecl->getAttr<FinalAttr>()) {
2532 Diag(BaseLoc, diag::err_class_marked_final_used_as_base)
2533 << CXXBaseDecl->getDeclName()
2534 << FA->isSpelledAsSealed();
2535 Diag(CXXBaseDecl->getLocation(), diag::note_entity_declared_at)
2536 << CXXBaseDecl->getDeclName() << FA->getRange();
2537 return nullptr;
2538 }
2539
2540 if (BaseDecl->isInvalidDecl())
2541 Class->setInvalidDecl();
2542
2543 // Create the base specifier.
2544 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
2545 Class->getTagKind() == TTK_Class,
2546 Access, TInfo, EllipsisLoc);
2547 }
2548
2549 /// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is
2550 /// one entry in the base class list of a class specifier, for
2551 /// example:
2552 /// class foo : public bar, virtual private baz {
2553 /// 'public bar' and 'virtual private baz' are each base-specifiers.
2554 BaseResult
2555 Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange,
2556 ParsedAttributes &Attributes,
2557 bool Virtual, AccessSpecifier Access,
2558 ParsedType basetype, SourceLocation BaseLoc,
2559 SourceLocation EllipsisLoc) {
2560 if (!classdecl)
2561 return true;
2562
2563 AdjustDeclIfTemplate(classdecl);
2564 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl);
2565 if (!Class)
2566 return true;
2567
2568 // We haven't yet attached the base specifiers.
2569 Class->setIsParsingBaseSpecifiers();
2570
2571 // We do not support any C++11 attributes on base-specifiers yet.
2572 // Diagnose any attributes we see.
2573 for (const ParsedAttr &AL : Attributes) {
2574 if (AL.isInvalid() || AL.getKind() == ParsedAttr::IgnoredAttribute)
2575 continue;
2576 Diag(AL.getLoc(), AL.getKind() == ParsedAttr::UnknownAttribute
2577 ? (unsigned)diag::warn_unknown_attribute_ignored
2578 : (unsigned)diag::err_base_specifier_attribute)
2579 << AL;
2580 }
2581
2582 TypeSourceInfo *TInfo = nullptr;
2583 GetTypeFromParser(basetype, &TInfo);
2584
2585 if (EllipsisLoc.isInvalid() &&
2586 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo,
2587 UPPC_BaseType))
2588 return true;
2589
2590 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange,
2591 Virtual, Access, TInfo,
2592 EllipsisLoc))
2593 return BaseSpec;
2594 else
2595 Class->setInvalidDecl();
2596
2597 return true;
2598 }
2599
2600 /// Use small set to collect indirect bases. As this is only used
2601 /// locally, there's no need to abstract the small size parameter.
2602 typedef llvm::SmallPtrSet<QualType, 4> IndirectBaseSet;
2603
2604 /// Recursively add the bases of Type. Don't add Type itself.
2605 static void
2606 NoteIndirectBases(ASTContext &Context, IndirectBaseSet &Set,
2607 const QualType &Type)
2608 {
2609 // Even though the incoming type is a base, it might not be
2610 // a class -- it could be a template parm, for instance.
2611 if (auto Rec = Type->getAs<RecordType>()) {
2612 auto Decl = Rec->getAsCXXRecordDecl();
2613
2614 // Iterate over its bases.
2615 for (const auto &BaseSpec : Decl->bases()) {
2616 QualType Base = Context.getCanonicalType(BaseSpec.getType())
2617 .getUnqualifiedType();
2618 if (Set.insert(Base).second)
2619 // If we've not already seen it, recurse.
2620 NoteIndirectBases(Context, Set, Base);
2621 }
2622 }
2623 }
2624
2625 /// Performs the actual work of attaching the given base class
2626 /// specifiers to a C++ class.
2627 bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class,
2628 MutableArrayRef<CXXBaseSpecifier *> Bases) {
2629 if (Bases.empty())
2630 return false;
2631
2632 // Used to keep track of which base types we have already seen, so
2633 // that we can properly diagnose redundant direct base types. Note
2634 // that the key is always the unqualified canonical type of the base
2635 // class.
2636 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes;
2637
2638 // Used to track indirect bases so we can see if a direct base is
2639 // ambiguous.
2640 IndirectBaseSet IndirectBaseTypes;
2641
2642 // Copy non-redundant base specifiers into permanent storage.
2643 unsigned NumGoodBases = 0;
2644 bool Invalid = false;
2645 for (unsigned idx = 0; idx < Bases.size(); ++idx) {
2646 QualType NewBaseType
2647 = Context.getCanonicalType(Bases[idx]->getType());
2648 NewBaseType = NewBaseType.getLocalUnqualifiedType();
2649
2650 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType];
2651 if (KnownBase) {
2652 // C++ [class.mi]p3:
2653 // A class shall not be specified as a direct base class of a
2654 // derived class more than once.
2655 Diag(Bases[idx]->getBeginLoc(), diag::err_duplicate_base_class)
2656 << KnownBase->getType() << Bases[idx]->getSourceRange();
2657
2658 // Delete the duplicate base class specifier; we're going to
2659 // overwrite its pointer later.
2660 Context.Deallocate(Bases[idx]);
2661
2662 Invalid = true;
2663 } else {
2664 // Okay, add this new base class.
2665 KnownBase = Bases[idx];
2666 Bases[NumGoodBases++] = Bases[idx];
2667
2668 // Note this base's direct & indirect bases, if there could be ambiguity.
2669 if (Bases.size() > 1)
2670 NoteIndirectBases(Context, IndirectBaseTypes, NewBaseType);
2671
2672 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) {
2673 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
2674 if (Class->isInterface() &&
2675 (!RD->isInterfaceLike() ||
2676 KnownBase->getAccessSpecifier() != AS_public)) {
2677 // The Microsoft extension __interface does not permit bases that
2678 // are not themselves public interfaces.
2679 Diag(KnownBase->getBeginLoc(), diag::err_invalid_base_in_interface)
2680 << getRecordDiagFromTagKind(RD->getTagKind()) << RD
2681 << RD->getSourceRange();
2682 Invalid = true;
2683 }
2684 if (RD->hasAttr<WeakAttr>())
2685 Class->addAttr(WeakAttr::CreateImplicit(Context));
2686 }
2687 }
2688 }
2689
2690 // Attach the remaining base class specifiers to the derived class.
2691 Class->setBases(Bases.data(), NumGoodBases);
2692
2693 // Check that the only base classes that are duplicate are virtual.
2694 for (unsigned idx = 0; idx < NumGoodBases; ++idx) {
2695 // Check whether this direct base is inaccessible due to ambiguity.
2696 QualType BaseType = Bases[idx]->getType();
2697
2698 // Skip all dependent types in templates being used as base specifiers.
2699 // Checks below assume that the base specifier is a CXXRecord.
2700 if (BaseType->isDependentType())
2701 continue;
2702
2703 CanQualType CanonicalBase = Context.getCanonicalType(BaseType)
2704 .getUnqualifiedType();
2705
2706 if (IndirectBaseTypes.count(CanonicalBase)) {
2707 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
2708 /*DetectVirtual=*/true);
2709 bool found
2710 = Class->isDerivedFrom(CanonicalBase->getAsCXXRecordDecl(), Paths);
2711 assert(found);
2712 (void)found;
2713
2714 if (Paths.isAmbiguous(CanonicalBase))
2715 Diag(Bases[idx]->getBeginLoc(), diag::warn_inaccessible_base_class)
2716 << BaseType << getAmbiguousPathsDisplayString(Paths)
2717 << Bases[idx]->getSourceRange();
2718 else
2719 assert(Bases[idx]->isVirtual());
2720 }
2721
2722 // Delete the base class specifier, since its data has been copied
2723 // into the CXXRecordDecl.
2724 Context.Deallocate(Bases[idx]);
2725 }
2726
2727 return Invalid;
2728 }
2729
2730 /// ActOnBaseSpecifiers - Attach the given base specifiers to the
2731 /// class, after checking whether there are any duplicate base
2732 /// classes.
2733 void Sema::ActOnBaseSpecifiers(Decl *ClassDecl,
2734 MutableArrayRef<CXXBaseSpecifier *> Bases) {
2735 if (!ClassDecl || Bases.empty())
2736 return;
2737
2738 AdjustDeclIfTemplate(ClassDecl);
2739 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), Bases);
2740 }
2741
2742 /// Determine whether the type \p Derived is a C++ class that is
2743 /// derived from the type \p Base.
2744 bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base) {
2745 if (!getLangOpts().CPlusPlus)
2746 return false;
2747
2748 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl();
2749 if (!DerivedRD)
2750 return false;
2751
2752 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl();
2753 if (!BaseRD)
2754 return false;
2755
2756 // If either the base or the derived type is invalid, don't try to
2757 // check whether one is derived from the other.
2758 if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl())
2759 return false;
2760
2761 // FIXME: In a modules build, do we need the entire path to be visible for us
2762 // to be able to use the inheritance relationship?
2763 if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined())
2764 return false;
2765
2766 return DerivedRD->isDerivedFrom(BaseRD);
2767 }
2768
2769 /// Determine whether the type \p Derived is a C++ class that is
2770 /// derived from the type \p Base.
2771 bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base,
2772 CXXBasePaths &Paths) {
2773 if (!getLangOpts().CPlusPlus)
2774 return false;
2775
2776 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl();
2777 if (!DerivedRD)
2778 return false;
2779
2780 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl();
2781 if (!BaseRD)
2782 return false;
2783
2784 if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined())
2785 return false;
2786
2787 return DerivedRD->isDerivedFrom(BaseRD, Paths);
2788 }
2789
2790 static void BuildBasePathArray(const CXXBasePath &Path,
2791 CXXCastPath &BasePathArray) {
2792 // We first go backward and check if we have a virtual base.
2793 // FIXME: It would be better if CXXBasePath had the base specifier for
2794 // the nearest virtual base.
2795 unsigned Start = 0;
2796 for (unsigned I = Path.size(); I != 0; --I) {
2797 if (Path[I - 1].Base->isVirtual()) {
2798 Start = I - 1;
2799 break;
2800 }
2801 }
2802
2803 // Now add all bases.
2804 for (unsigned I = Start, E = Path.size(); I != E; ++I)
2805 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base));
2806 }
2807
2808
2809 void Sema::BuildBasePathArray(const CXXBasePaths &Paths,
2810 CXXCastPath &BasePathArray) {
2811 assert(BasePathArray.empty() && "Base path array must be empty!");
2812 assert(Paths.isRecordingPaths() && "Must record paths!");
2813 return ::BuildBasePathArray(Paths.front(), BasePathArray);
2814 }
2815 /// CheckDerivedToBaseConversion - Check whether the Derived-to-Base
2816 /// conversion (where Derived and Base are class types) is
2817 /// well-formed, meaning that the conversion is unambiguous (and
2818 /// that all of the base classes are accessible). Returns true
2819 /// and emits a diagnostic if the code is ill-formed, returns false
2820 /// otherwise. Loc is the location where this routine should point to
2821 /// if there is an error, and Range is the source range to highlight
2822 /// if there is an error.
2823 ///
2824 /// If either InaccessibleBaseID or AmbigiousBaseConvID are 0, then the
2825 /// diagnostic for the respective type of error will be suppressed, but the
2826 /// check for ill-formed code will still be performed.
2827 bool
2828 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
2829 unsigned InaccessibleBaseID,
2830 unsigned AmbigiousBaseConvID,
2831 SourceLocation Loc, SourceRange Range,
2832 DeclarationName Name,
2833 CXXCastPath *BasePath,
2834 bool IgnoreAccess) {
2835 // First, determine whether the path from Derived to Base is
2836 // ambiguous. This is slightly more expensive than checking whether
2837 // the Derived to Base conversion exists, because here we need to
2838 // explore multiple paths to determine if there is an ambiguity.
2839 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
2840 /*DetectVirtual=*/false);
2841 bool DerivationOkay = IsDerivedFrom(Loc, Derived, Base, Paths);
2842 if (!DerivationOkay)
2843 return true;
2844
2845 const CXXBasePath *Path = nullptr;
2846 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType()))
2847 Path = &Paths.front();
2848
2849 // For MSVC compatibility, check if Derived directly inherits from Base. Clang
2850 // warns about this hierarchy under -Winaccessible-base, but MSVC allows the
2851 // user to access such bases.
2852 if (!Path && getLangOpts().MSVCCompat) {
2853 for (const CXXBasePath &PossiblePath : Paths) {
2854 if (PossiblePath.size() == 1) {
2855 Path = &PossiblePath;
2856 if (AmbigiousBaseConvID)
2857 Diag(Loc, diag::ext_ms_ambiguous_direct_base)
2858 << Base << Derived << Range;
2859 break;
2860 }
2861 }
2862 }
2863
2864 if (Path) {
2865 if (!IgnoreAccess) {
2866 // Check that the base class can be accessed.
2867 switch (
2868 CheckBaseClassAccess(Loc, Base, Derived, *Path, InaccessibleBaseID)) {
2869 case AR_inaccessible:
2870 return true;
2871 case AR_accessible:
2872 case AR_dependent:
2873 case AR_delayed:
2874 break;
2875 }
2876 }
2877
2878 // Build a base path if necessary.
2879 if (BasePath)
2880 ::BuildBasePathArray(*Path, *BasePath);
2881 return false;
2882 }
2883
2884 if (AmbigiousBaseConvID) {
2885 // We know that the derived-to-base conversion is ambiguous, and
2886 // we're going to produce a diagnostic. Perform the derived-to-base
2887 // search just one more time to compute all of the possible paths so
2888 // that we can print them out. This is more expensive than any of
2889 // the previous derived-to-base checks we've done, but at this point
2890 // performance isn't as much of an issue.
2891 Paths.clear();
2892 Paths.setRecordingPaths(true);
2893 bool StillOkay = IsDerivedFrom(Loc, Derived, Base, Paths);
2894 assert(StillOkay && "Can only be used with a derived-to-base conversion");
2895 (void)StillOkay;
2896
2897 // Build up a textual representation of the ambiguous paths, e.g.,
2898 // D -> B -> A, that will be used to illustrate the ambiguous
2899 // conversions in the diagnostic. We only print one of the paths
2900 // to each base class subobject.
2901 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths);
2902
2903 Diag(Loc, AmbigiousBaseConvID)
2904 << Derived << Base << PathDisplayStr << Range << Name;
2905 }
2906 return true;
2907 }
2908
2909 bool
2910 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
2911 SourceLocation Loc, SourceRange Range,
2912 CXXCastPath *BasePath,
2913 bool IgnoreAccess) {
2914 return CheckDerivedToBaseConversion(
2915 Derived, Base, diag::err_upcast_to_inaccessible_base,
2916 diag::err_ambiguous_derived_to_base_conv, Loc, Range, DeclarationName(),
2917 BasePath, IgnoreAccess);
2918 }
2919
2920
2921 /// Builds a string representing ambiguous paths from a
2922 /// specific derived class to different subobjects of the same base
2923 /// class.
2924 ///
2925 /// This function builds a string that can be used in error messages
2926 /// to show the different paths that one can take through the
2927 /// inheritance hierarchy to go from the derived class to different
2928 /// subobjects of a base class. The result looks something like this:
2929 /// @code
2930 /// struct D -> struct B -> struct A
2931 /// struct D -> struct C -> struct A
2932 /// @endcode
2933 std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) {
2934 std::string PathDisplayStr;
2935 std::set<unsigned> DisplayedPaths;
2936 for (CXXBasePaths::paths_iterator Path = Paths.begin();
2937 Path != Paths.end(); ++Path) {
2938 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) {
2939 // We haven't displayed a path to this particular base
2940 // class subobject yet.
2941 PathDisplayStr += "\n ";
2942 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString();
2943 for (CXXBasePath::const_iterator Element = Path->begin();
2944 Element != Path->end(); ++Element)
2945 PathDisplayStr += " -> " + Element->Base->getType().getAsString();
2946 }
2947 }
2948
2949 return PathDisplayStr;
2950 }
2951
2952 //===----------------------------------------------------------------------===//
2953 // C++ class member Handling
2954 //===----------------------------------------------------------------------===//
2955
2956 /// ActOnAccessSpecifier - Parsed an access specifier followed by a colon.
2957 bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, SourceLocation ASLoc,
2958 SourceLocation ColonLoc,
2959 const ParsedAttributesView &Attrs) {
2960 assert(Access != AS_none && "Invalid kind for syntactic access specifier!");
2961 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext,
2962 ASLoc, ColonLoc);
2963 CurContext->addHiddenDecl(ASDecl);
2964 return ProcessAccessDeclAttributeList(ASDecl, Attrs);
2965 }
2966
2967 /// CheckOverrideControl - Check C++11 override control semantics.
2968 void Sema::CheckOverrideControl(NamedDecl *D) {
2969 if (D->isInvalidDecl())
2970 return;
2971
2972 // We only care about "override" and "final" declarations.
2973 if (!D->hasAttr<OverrideAttr>() && !D->hasAttr<FinalAttr>())
2974 return;
2975
2976 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D);
2977
2978 // We can't check dependent instance methods.
2979 if (MD && MD->isInstance() &&
2980 (MD->getParent()->hasAnyDependentBases() ||
2981 MD->getType()->isDependentType()))
2982 return;
2983
2984 if (MD && !MD->isVirtual()) {
2985 // If we have a non-virtual method, check if if hides a virtual method.
2986 // (In that case, it's most likely the method has the wrong type.)
2987 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
2988 FindHiddenVirtualMethods(MD, OverloadedMethods);
2989
2990 if (!OverloadedMethods.empty()) {
2991 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) {
2992 Diag(OA->getLocation(),
2993 diag::override_keyword_hides_virtual_member_function)
2994 << "override" << (OverloadedMethods.size() > 1);
2995 } else if (FinalAttr *FA = D->getAttr<FinalAttr>()) {
2996 Diag(FA->getLocation(),
2997 diag::override_keyword_hides_virtual_member_function)
2998 << (FA->isSpelledAsSealed() ? "sealed" : "final")
2999 << (OverloadedMethods.size() > 1);
3000 }
3001 NoteHiddenVirtualMethods(MD, OverloadedMethods);
3002 MD->setInvalidDecl();
3003 return;
3004 }
3005 // Fall through into the general case diagnostic.
3006 // FIXME: We might want to attempt typo correction here.
3007 }
3008
3009 if (!MD || !MD->isVirtual()) {
3010 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) {
3011 Diag(OA->getLocation(),
3012 diag::override_keyword_only_allowed_on_virtual_member_functions)
3013 << "override" << FixItHint::CreateRemoval(OA->getLocation());
3014 D->dropAttr<OverrideAttr>();
3015 }
3016 if (FinalAttr *FA = D->getAttr<FinalAttr>()) {
3017 Diag(FA->getLocation(),
3018 diag::override_keyword_only_allowed_on_virtual_member_functions)
3019 << (FA->isSpelledAsSealed() ? "sealed" : "final")
3020 << FixItHint::CreateRemoval(FA->getLocation());
3021 D->dropAttr<FinalAttr>();
3022 }
3023 return;
3024 }
3025
3026 // C++11 [class.virtual]p5:
3027 // If a function is marked with the virt-specifier override and
3028 // does not override a member function of a base class, the program is
3029 // ill-formed.
3030 bool HasOverriddenMethods = MD->size_overridden_methods() != 0;
3031 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods)
3032 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding)
3033 << MD->getDeclName();
3034 }
3035
3036 void Sema::DiagnoseAbsenceOfOverrideControl(NamedDecl *D) {
3037 if (D->isInvalidDecl() || D->hasAttr<OverrideAttr>())
3038 return;
3039 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D);
3040 if (!MD || MD->isImplicit() || MD->hasAttr<FinalAttr>())
3041 return;
3042
3043 SourceLocation Loc = MD->getLocation();
3044 SourceLocation SpellingLoc = Loc;
3045 if (getSourceManager().isMacroArgExpansion(Loc))
3046 SpellingLoc = getSourceManager().getImmediateExpansionRange(Loc).getBegin();
3047 SpellingLoc = getSourceManager().getSpellingLoc(SpellingLoc);
3048 if (SpellingLoc.isValid() && getSourceManager().isInSystemHeader(SpellingLoc))
3049 return;
3050
3051 if (MD->size_overridden_methods() > 0) {
3052 unsigned DiagID = isa<CXXDestructorDecl>(MD)
3053 ? diag::warn_destructor_marked_not_override_overriding
3054 : diag::warn_function_marked_not_override_overriding;
3055 Diag(MD->getLocation(), DiagID) << MD->getDeclName();
3056 const CXXMethodDecl *OMD = *MD->begin_overridden_methods();
3057 Diag(OMD->getLocation(), diag::note_overridden_virtual_function);
3058 }
3059 }
3060
3061 /// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member
3062 /// function overrides a virtual member function marked 'final', according to
3063 /// C++11 [class.virtual]p4.
3064 bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New,
3065 const CXXMethodDecl *Old) {
3066 FinalAttr *FA = Old->getAttr<FinalAttr>();
3067 if (!FA)
3068 return false;
3069
3070 Diag(New->getLocation(), diag::err_final_function_overridden)
3071 << New->getDeclName()
3072 << FA->isSpelledAsSealed();
3073 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
3074 return true;
3075 }
3076
3077 static bool InitializationHasSideEffects(const FieldDecl &FD) {
3078 const Type *T = FD.getType()->getBaseElementTypeUnsafe();
3079 // FIXME: Destruction of ObjC lifetime types has side-effects.
3080 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3081 return !RD->isCompleteDefinition() ||
3082 !RD->hasTrivialDefaultConstructor() ||
3083 !RD->hasTrivialDestructor();
3084 return false;
3085 }
3086
3087 static const ParsedAttr *getMSPropertyAttr(const ParsedAttributesView &list) {
3088 ParsedAttributesView::const_iterator Itr =
3089 llvm::find_if(list, [](const ParsedAttr &AL) {
3090 return AL.isDeclspecPropertyAttribute();
3091 });
3092 if (Itr != list.end())
3093 return &*Itr;
3094 return nullptr;
3095 }
3096
3097 // Check if there is a field shadowing.
3098 void Sema::CheckShadowInheritedFields(const SourceLocation &Loc,
3099 DeclarationName FieldName,
3100 const CXXRecordDecl *RD,
3101 bool DeclIsField) {
3102 if (Diags.isIgnored(diag::warn_shadow_field, Loc))
3103 return;
3104
3105 // To record a shadowed field in a base
3106 std::map<CXXRecordDecl*, NamedDecl*> Bases;
3107 auto FieldShadowed = [&](const CXXBaseSpecifier *Specifier,
3108 CXXBasePath &Path) {
3109 const auto Base = Specifier->getType()->getAsCXXRecordDecl();
3110 // Record an ambiguous path directly
3111 if (Bases.find(Base) != Bases.end())
3112 return true;
3113 for (const auto Field : Base->lookup(FieldName)) {
3114 if ((isa<FieldDecl>(Field) || isa<IndirectFieldDecl>(Field)) &&
3115 Field->getAccess() != AS_private) {
3116 assert(Field->getAccess() != AS_none);
3117 assert(Bases.find(Base) == Bases.end());
3118 Bases[Base] = Field;
3119 return true;
3120 }
3121 }
3122 return false;
3123 };
3124
3125 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
3126 /*DetectVirtual=*/true);
3127 if (!RD->lookupInBases(FieldShadowed, Paths))
3128 return;
3129
3130 for (const auto &P : Paths) {
3131 auto Base = P.back().Base->getType()->getAsCXXRecordDecl();
3132 auto It = Bases.find(Base);
3133 // Skip duplicated bases
3134 if (It == Bases.end())
3135 continue;
3136 auto BaseField = It->second;
3137 assert(BaseField->getAccess() != AS_private);
3138 if (AS_none !=
3139 CXXRecordDecl::MergeAccess(P.Access, BaseField->getAccess())) {
3140 Diag(Loc, diag::warn_shadow_field)
3141 << FieldName << RD << Base << DeclIsField;
3142 Diag(BaseField->getLocation(), diag::note_shadow_field);
3143 Bases.erase(It);
3144 }
3145 }
3146 }
3147
3148 /// ActOnCXXMemberDeclarator - This is invoked when a C++ class member
3149 /// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the
3150 /// bitfield width if there is one, 'InitExpr' specifies the initializer if
3151 /// one has been parsed, and 'InitStyle' is set if an in-class initializer is
3152 /// present (but parsing it has been deferred).
3153 NamedDecl *
3154 Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D,
3155 MultiTemplateParamsArg TemplateParameterLists,
3156 Expr *BW, const VirtSpecifiers &VS,
3157 InClassInitStyle InitStyle) {
3158 const DeclSpec &DS = D.getDeclSpec();
3159 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
3160 DeclarationName Name = NameInfo.getName();
3161 SourceLocation Loc = NameInfo.getLoc();
3162
3163 // For anonymous bitfields, the location should point to the type.
3164 if (Loc.isInvalid())
3165 Loc = D.getBeginLoc();
3166
3167 Expr *BitWidth = static_cast<Expr*>(BW);
3168
3169 assert(isa<CXXRecordDecl>(CurContext));
3170 assert(!DS.isFriendSpecified());
3171
3172 bool isFunc = D.isDeclarationOfFunction();
3173 const ParsedAttr *MSPropertyAttr =
3174 getMSPropertyAttr(D.getDeclSpec().getAttributes());
3175
3176 if (cast<CXXRecordDecl>(CurContext)->isInterface()) {
3177 // The Microsoft extension __interface only permits public member functions
3178 // and prohibits constructors, destructors, operators, non-public member
3179 // functions, static methods and data members.
3180 unsigned InvalidDecl;
3181 bool ShowDeclName = true;
3182 if (!isFunc &&
3183 (DS.getStorageClassSpec() == DeclSpec::SCS_typedef || MSPropertyAttr))
3184 InvalidDecl = 0;
3185 else if (!isFunc)
3186 InvalidDecl = 1;
3187 else if (AS != AS_public)
3188 InvalidDecl = 2;
3189 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static)
3190 InvalidDecl = 3;
3191 else switch (Name.getNameKind()) {
3192 case DeclarationName::CXXConstructorName:
3193 InvalidDecl = 4;
3194 ShowDeclName = false;
3195 break;
3196
3197 case DeclarationName::CXXDestructorName:
3198 InvalidDecl = 5;
3199 ShowDeclName = false;
3200 break;
3201
3202 case DeclarationName::CXXOperatorName:
3203 case DeclarationName::CXXConversionFunctionName:
3204 InvalidDecl = 6;
3205 break;
3206
3207 default:
3208 InvalidDecl = 0;
3209 break;
3210 }
3211
3212 if (InvalidDecl) {
3213 if (ShowDeclName)
3214 Diag(Loc, diag::err_invalid_member_in_interface)
3215 << (InvalidDecl-1) << Name;
3216 else
3217 Diag(Loc, diag::err_invalid_member_in_interface)
3218 << (InvalidDecl-1) << "";
3219 return nullptr;
3220 }
3221 }
3222
3223 // C++ 9.2p6: A member shall not be declared to have automatic storage
3224 // duration (auto, register) or with the extern storage-class-specifier.
3225 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class
3226 // data members and cannot be applied to names declared const or static,
3227 // and cannot be applied to reference members.
3228 switch (DS.getStorageClassSpec()) {
3229 case DeclSpec::SCS_unspecified:
3230 case DeclSpec::SCS_typedef:
3231 case DeclSpec::SCS_static:
3232 break;
3233 case DeclSpec::SCS_mutable:
3234 if (isFunc) {
3235 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function);
3236
3237 // FIXME: It would be nicer if the keyword was ignored only for this
3238 // declarator. Otherwise we could get follow-up errors.
3239 D.getMutableDeclSpec().ClearStorageClassSpecs();
3240 }
3241 break;
3242 default:
3243 Diag(DS.getStorageClassSpecLoc(),
3244 diag::err_storageclass_invalid_for_member);
3245 D.getMutableDeclSpec().ClearStorageClassSpecs();
3246 break;
3247 }
3248
3249 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified ||
3250 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) &&
3251 !isFunc);
3252
3253 if (DS.hasConstexprSpecifier() && isInstField) {
3254 SemaDiagnosticBuilder B =
3255 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member);
3256 SourceLocation ConstexprLoc = DS.getConstexprSpecLoc();
3257 if (InitStyle == ICIS_NoInit) {
3258 B << 0 << 0;
3259 if (D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const)
3260 B << FixItHint::CreateRemoval(ConstexprLoc);
3261 else {
3262 B << FixItHint::CreateReplacement(ConstexprLoc, "const");
3263 D.getMutableDeclSpec().ClearConstexprSpec();
3264 const char *PrevSpec;
3265 unsigned DiagID;
3266 bool Failed = D.getMutableDeclSpec().SetTypeQual(
3267 DeclSpec::TQ_const, ConstexprLoc, PrevSpec, DiagID, getLangOpts());
3268 (void)Failed;
3269 assert(!Failed && "Making a constexpr member const shouldn't fail");
3270 }
3271 } else {
3272 B << 1;
3273 const char *PrevSpec;
3274 unsigned DiagID;
3275 if (D.getMutableDeclSpec().SetStorageClassSpec(
3276 *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID,
3277 Context.getPrintingPolicy())) {
3278 assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable &&
3279 "This is the only DeclSpec that should fail to be applied");
3280 B << 1;
3281 } else {
3282 B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static ");
3283 isInstField = false;
3284 }
3285 }
3286 }
3287
3288 NamedDecl *Member;
3289 if (isInstField) {
3290 CXXScopeSpec &SS = D.getCXXScopeSpec();
3291
3292 // Data members must have identifiers for names.
3293 if (!Name.isIdentifier()) {
3294 Diag(Loc, diag::err_bad_variable_name)
3295 << Name;
3296 return nullptr;
3297 }
3298
3299 IdentifierInfo *II = Name.getAsIdentifierInfo();
3300
3301 // Member field could not be with "template" keyword.
3302 // So TemplateParameterLists should be empty in this case.
3303 if (TemplateParameterLists.size()) {
3304 TemplateParameterList* TemplateParams = TemplateParameterLists[0];
3305 if (TemplateParams->size()) {
3306 // There is no such thing as a member field template.
3307 Diag(D.getIdentifierLoc(), diag::err_template_member)
3308 << II
3309 << SourceRange(TemplateParams->getTemplateLoc(),
3310 TemplateParams->getRAngleLoc());
3311 } else {
3312 // There is an extraneous 'template<>' for this member.
3313 Diag(TemplateParams->getTemplateLoc(),
3314 diag::err_template_member_noparams)
3315 << II
3316 << SourceRange(TemplateParams->getTemplateLoc(),
3317 TemplateParams->getRAngleLoc());
3318 }
3319 return nullptr;
3320 }
3321
3322 if (SS.isSet() && !SS.isInvalid()) {
3323 // The user provided a superfluous scope specifier inside a class
3324 // definition:
3325 //
3326 // class X {
3327 // int X::member;
3328 // };
3329 if (DeclContext *DC = computeDeclContext(SS, false))
3330 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc(),
3331 D.getName().getKind() ==
3332 UnqualifiedIdKind::IK_TemplateId);
3333 else
3334 Diag(D.getIdentifierLoc(), diag::err_member_qualification)
3335 << Name << SS.getRange();
3336
3337 SS.clear();
3338 }
3339
3340 if (MSPropertyAttr) {
3341 Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D,
3342 BitWidth, InitStyle, AS, *MSPropertyAttr);
3343 if (!Member)
3344 return nullptr;
3345 isInstField = false;
3346 } else {
3347 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D,
3348 BitWidth, InitStyle, AS);
3349 if (!Member)
3350 return nullptr;
3351 }
3352
3353 CheckShadowInheritedFields(Loc, Name, cast<CXXRecordDecl>(CurContext));
3354 } else {
3355 Member = HandleDeclarator(S, D, TemplateParameterLists);
3356 if (!Member)
3357 return nullptr;
3358
3359 // Non-instance-fields can't have a bitfield.
3360 if (BitWidth) {
3361 if (Member->isInvalidDecl()) {
3362 // don't emit another diagnostic.
3363 } else if (isa<VarDecl>(Member) || isa<VarTemplateDecl>(Member)) {
3364 // C++ 9.6p3: A bit-field shall not be a static member.
3365 // "static member 'A' cannot be a bit-field"
3366 Diag(Loc, diag::err_static_not_bitfield)
3367 << Name << BitWidth->getSourceRange();
3368 } else if (isa<TypedefDecl>(Member)) {
3369 // "typedef member 'x' cannot be a bit-field"
3370 Diag(Loc, diag::err_typedef_not_bitfield)
3371 << Name << BitWidth->getSourceRange();
3372 } else {
3373 // A function typedef ("typedef int f(); f a;").
3374 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
3375 Diag(Loc, diag::err_not_integral_type_bitfield)
3376 << Name << cast<ValueDecl>(Member)->getType()
3377 << BitWidth->getSourceRange();
3378 }
3379
3380 BitWidth = nullptr;
3381 Member->setInvalidDecl();
3382 }
3383
3384 NamedDecl *NonTemplateMember = Member;
3385 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member))
3386 NonTemplateMember = FunTmpl->getTemplatedDecl();
3387 else if (VarTemplateDecl *VarTmpl = dyn_cast<VarTemplateDecl>(Member))
3388 NonTemplateMember = VarTmpl->getTemplatedDecl();
3389
3390 Member->setAccess(AS);
3391
3392 // If we have declared a member function template or static data member
3393 // template, set the access of the templated declaration as well.
3394 if (NonTemplateMember != Member)
3395 NonTemplateMember->setAccess(AS);
3396
3397 // C++ [temp.deduct.guide]p3:
3398 // A deduction guide [...] for a member class template [shall be
3399 // declared] with the same access [as the template].
3400 if (auto *DG = dyn_cast<CXXDeductionGuideDecl>(NonTemplateMember)) {
3401 auto *TD = DG->getDeducedTemplate();
3402 // Access specifiers are only meaningful if both the template and the
3403 // deduction guide are from the same scope.
3404 if (AS != TD->getAccess() &&
3405 TD->getDeclContext()->getRedeclContext()->Equals(
3406 DG->getDeclContext()->getRedeclContext())) {
3407 Diag(DG->getBeginLoc(), diag::err_deduction_guide_wrong_access);
3408 Diag(TD->getBeginLoc(), diag::note_deduction_guide_template_access)
3409 << TD->getAccess();
3410 const AccessSpecDecl *LastAccessSpec = nullptr;
3411 for (const auto *D : cast<CXXRecordDecl>(CurContext)->decls()) {
3412 if (const auto *AccessSpec = dyn_cast<AccessSpecDecl>(D))
3413 LastAccessSpec = AccessSpec;
3414 }
3415 assert(LastAccessSpec && "differing access with no access specifier");
3416 Diag(LastAccessSpec->getBeginLoc(), diag::note_deduction_guide_access)
3417 << AS;
3418 }
3419 }
3420 }
3421
3422 if (VS.isOverrideSpecified())
3423 Member->addAttr(OverrideAttr::Create(Context, VS.getOverrideLoc(),
3424 AttributeCommonInfo::AS_Keyword));
3425 if (VS.isFinalSpecified())
3426 Member->addAttr(FinalAttr::Create(
3427 Context, VS.getFinalLoc(), AttributeCommonInfo::AS_Keyword,
3428 static_cast<FinalAttr::Spelling>(VS.isFinalSpelledSealed())));
3429
3430 if (VS.getLastLocation().isValid()) {
3431 // Update the end location of a method that has a virt-specifiers.
3432 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member))
3433 MD->setRangeEnd(VS.getLastLocation());
3434 }
3435
3436 CheckOverrideControl(Member);
3437
3438 assert((Name || isInstField) && "No identifier for non-field ?");
3439
3440 if (isInstField) {
3441 FieldDecl *FD = cast<FieldDecl>(Member);
3442 FieldCollector->Add(FD);
3443
3444 if (!Diags.isIgnored(diag::warn_unused_private_field, FD->getLocation())) {
3445 // Remember all explicit private FieldDecls that have a name, no side
3446 // effects and are not part of a dependent type declaration.
3447 if (!FD->isImplicit() && FD->getDeclName() &&
3448 FD->getAccess() == AS_private &&
3449 !FD->hasAttr<UnusedAttr>() &&
3450 !FD->getParent()->isDependentContext() &&
3451 !InitializationHasSideEffects(*FD))
3452 UnusedPrivateFields.insert(FD);
3453 }
3454 }
3455
3456 return Member;
3457 }
3458
3459 namespace {
3460 class UninitializedFieldVisitor
3461 : public EvaluatedExprVisitor<UninitializedFieldVisitor> {
3462 Sema &S;
3463 // List of Decls to generate a warning on. Also remove Decls that become
3464 // initialized.
3465 llvm::SmallPtrSetImpl<ValueDecl*> &Decls;
3466 // List of base classes of the record. Classes are removed after their
3467 // initializers.
3468 llvm::SmallPtrSetImpl<QualType> &BaseClasses;
3469 // Vector of decls to be removed from the Decl set prior to visiting the
3470 // nodes. These Decls may have been initialized in the prior initializer.
3471 llvm::SmallVector<ValueDecl*, 4> DeclsToRemove;
3472 // If non-null, add a note to the warning pointing back to the constructor.
3473 const CXXConstructorDecl *Constructor;
3474 // Variables to hold state when processing an initializer list. When
3475 // InitList is true, special case initialization of FieldDecls matching
3476 // InitListFieldDecl.
3477 bool InitList;
3478 FieldDecl *InitListFieldDecl;
3479 llvm::SmallVector<unsigned, 4> InitFieldIndex;
3480
3481 public:
3482 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited;
3483 UninitializedFieldVisitor(Sema &S,
3484 llvm::SmallPtrSetImpl<ValueDecl*> &Decls,
3485 llvm::SmallPtrSetImpl<QualType> &BaseClasses)
3486 : Inherited(S.Context), S(S), Decls(Decls), BaseClasses(BaseClasses),
3487 Constructor(nullptr), InitList(false), InitListFieldDecl(nullptr) {}
3488
3489 // Returns true if the use of ME is not an uninitialized use.
3490 bool IsInitListMemberExprInitialized(MemberExpr *ME,
3491 bool CheckReferenceOnly) {
3492 llvm::SmallVector<FieldDecl*, 4> Fields;
3493 bool ReferenceField = false;
3494 while (ME) {
3495 FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl());
3496 if (!FD)
3497 return false;
3498 Fields.push_back(FD);
3499 if (FD->getType()->isReferenceType())
3500 ReferenceField = true;
3501 ME = dyn_cast<MemberExpr>(ME->getBase()->IgnoreParenImpCasts());
3502 }
3503
3504 // Binding a reference to an uninitialized field is not an
3505 // uninitialized use.
3506 if (CheckReferenceOnly && !ReferenceField)
3507 return true;
3508
3509 llvm::SmallVector<unsigned, 4> UsedFieldIndex;
3510 // Discard the first field since it is the field decl that is being
3511 // initialized.
3512 for (auto I = Fields.rbegin() + 1, E = Fields.rend(); I != E; ++I) {
3513 UsedFieldIndex.push_back((*I)->getFieldIndex());
3514 }
3515
3516 for (auto UsedIter = UsedFieldIndex.begin(),
3517 UsedEnd = UsedFieldIndex.end(),
3518 OrigIter = InitFieldIndex.begin(),
3519 OrigEnd = InitFieldIndex.end();
3520 UsedIter != UsedEnd && OrigIter != OrigEnd; ++UsedIter, ++OrigIter) {
3521 if (*UsedIter < *OrigIter)
3522 return true;
3523 if (*UsedIter > *OrigIter)
3524 break;
3525 }
3526
3527 return false;
3528 }
3529
3530 void HandleMemberExpr(MemberExpr *ME, bool CheckReferenceOnly,
3531 bool AddressOf) {
3532 if (isa<EnumConstantDecl>(ME->getMemberDecl()))
3533 return;
3534
3535 // FieldME is the inner-most MemberExpr that is not an anonymous struct
3536 // or union.
3537 MemberExpr *FieldME = ME;
3538
3539 bool AllPODFields = FieldME->getType().isPODType(S.Context);
3540
3541 Expr *Base = ME;
3542 while (MemberExpr *SubME =
3543 dyn_cast<MemberExpr>(Base->IgnoreParenImpCasts())) {
3544
3545 if (isa<VarDecl>(SubME->getMemberDecl()))
3546 return;
3547
3548 if (FieldDecl *FD = dyn_cast<FieldDecl>(SubME->getMemberDecl()))
3549 if (!FD->isAnonymousStructOrUnion())
3550 FieldME = SubME;
3551
3552 if (!FieldME->getType().isPODType(S.Context))
3553 AllPODFields = false;
3554
3555 Base = SubME->getBase();
3556 }
3557
3558 if (!isa<CXXThisExpr>(Base->IgnoreParenImpCasts()))
3559 return;
3560
3561 if (AddressOf && AllPODFields)
3562 return;
3563
3564 ValueDecl* FoundVD = FieldME->getMemberDecl();
3565
3566 if (ImplicitCastExpr *BaseCast = dyn_cast<ImplicitCastExpr>(Base)) {
3567 while (isa<ImplicitCastExpr>(BaseCast->getSubExpr())) {
3568 BaseCast = cast<ImplicitCastExpr>(BaseCast->getSubExpr());
3569 }
3570
3571 if (BaseCast->getCastKind() == CK_UncheckedDerivedToBase) {
3572 QualType T = BaseCast->getType();
3573 if (T->isPointerType() &&
3574 BaseClasses.count(T->getPointeeType())) {
3575 S.Diag(FieldME->getExprLoc(), diag::warn_base_class_is_uninit)
3576 << T->getPointeeType() << FoundVD;
3577 }
3578 }
3579 }
3580
3581 if (!Decls.count(FoundVD))
3582 return;
3583
3584 const bool IsReference = FoundVD->getType()->isReferenceType();
3585
3586 if (InitList && !AddressOf && FoundVD == InitListFieldDecl) {
3587 // Special checking for initializer lists.
3588 if (IsInitListMemberExprInitialized(ME, CheckReferenceOnly)) {
3589 return;
3590 }
3591 } else {
3592 // Prevent double warnings on use of unbounded references.
3593 if (CheckReferenceOnly && !IsReference)
3594 return;
3595 }
3596
3597 unsigned diag = IsReference
3598 ? diag::warn_reference_field_is_uninit
3599 : diag::warn_field_is_uninit;
3600 S.Diag(FieldME->getExprLoc(), diag) << FoundVD;
3601 if (Constructor)
3602 S.Diag(Constructor->getLocation(),
3603 diag::note_uninit_in_this_constructor)
3604 << (Constructor->isDefaultConstructor() && Constructor->isImplicit());
3605
3606 }
3607
3608 void HandleValue(Expr *E, bool AddressOf) {
3609 E = E->IgnoreParens();
3610
3611 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
3612 HandleMemberExpr(ME, false /*CheckReferenceOnly*/,
3613 AddressOf /*AddressOf*/);
3614 return;
3615 }
3616
3617 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
3618 Visit(CO->getCond());
3619 HandleValue(CO->getTrueExpr(), AddressOf);
3620 HandleValue(CO->getFalseExpr(), AddressOf);
3621 return;
3622 }
3623
3624 if (BinaryConditionalOperator *BCO =
3625 dyn_cast<BinaryConditionalOperator>(E)) {
3626 Visit(BCO->getCond());
3627 HandleValue(BCO->getFalseExpr(), AddressOf);
3628 return;
3629 }
3630
3631 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) {
3632 HandleValue(OVE->getSourceExpr(), AddressOf);
3633 return;
3634 }
3635
3636 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
3637 switch (BO->getOpcode()) {
3638 default:
3639 break;
3640 case(BO_PtrMemD):
3641 case(BO_PtrMemI):
3642 HandleValue(BO->getLHS(), AddressOf);
3643 Visit(BO->getRHS());
3644 return;
3645 case(BO_Comma):
3646 Visit(BO->getLHS());
3647 HandleValue(BO->getRHS(), AddressOf);
3648 return;
3649 }
3650 }
3651
3652 Visit(E);
3653 }
3654
3655 void CheckInitListExpr(InitListExpr *ILE) {
3656 InitFieldIndex.push_back(0);
3657 for (auto Child : ILE->children()) {
3658 if (InitListExpr *SubList = dyn_cast<InitListExpr>(Child)) {
3659 CheckInitListExpr(SubList);
3660 } else {
3661 Visit(Child);
3662 }
3663 ++InitFieldIndex.back();
3664 }
3665 InitFieldIndex.pop_back();
3666 }
3667
3668 void CheckInitializer(Expr *E, const CXXConstructorDecl *FieldConstructor,
3669 FieldDecl *Field, const Type *BaseClass) {
3670 // Remove Decls that may have been initialized in the previous
3671 // initializer.
3672 for (ValueDecl* VD : DeclsToRemove)
3673 Decls.erase(VD);
3674 DeclsToRemove.clear();
3675
3676 Constructor = FieldConstructor;
3677 InitListExpr *ILE = dyn_cast<InitListExpr>(E);
3678
3679 if (ILE && Field) {
3680 InitList = true;
3681 InitListFieldDecl = Field;
3682 InitFieldIndex.clear();
3683 CheckInitListExpr(ILE);
3684 } else {
3685 InitList = false;
3686 Visit(E);
3687 }
3688
3689 if (Field)
3690 Decls.erase(Field);
3691 if (BaseClass)
3692 BaseClasses.erase(BaseClass->getCanonicalTypeInternal());
3693 }
3694
3695 void VisitMemberExpr(MemberExpr *ME) {
3696 // All uses of unbounded reference fields will warn.
3697 HandleMemberExpr(ME, true /*CheckReferenceOnly*/, false /*AddressOf*/);
3698 }
3699
3700 void VisitImplicitCastExpr(ImplicitCastExpr *E) {
3701 if (E->getCastKind() == CK_LValueToRValue) {
3702 HandleValue(E->getSubExpr(), false /*AddressOf*/);
3703 return;
3704 }
3705
3706 Inherited::VisitImplicitCastExpr(E);
3707 }
3708
3709 void VisitCXXConstructExpr(CXXConstructExpr *E) {
3710 if (E->getConstructor()->isCopyConstructor()) {
3711 Expr *ArgExpr = E->getArg(0);
3712 if (InitListExpr *ILE = dyn_cast<InitListExpr>(ArgExpr))
3713 if (ILE->getNumInits() == 1)
3714 ArgExpr = ILE->getInit(0);
3715 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr))
3716 if (ICE->getCastKind() == CK_NoOp)
3717 ArgExpr = ICE->getSubExpr();
3718 HandleValue(ArgExpr, false /*AddressOf*/);
3719 return;
3720 }
3721 Inherited::VisitCXXConstructExpr(E);
3722 }
3723
3724 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) {
3725 Expr *Callee = E->getCallee();
3726 if (isa<MemberExpr>(Callee)) {
3727 HandleValue(Callee, false /*AddressOf*/);
3728 for (auto Arg : E->arguments())
3729 Visit(Arg);
3730 return;
3731 }
3732
3733 Inherited::VisitCXXMemberCallExpr(E);
3734 }
3735
3736 void VisitCallExpr(CallExpr *E) {
3737 // Treat std::move as a use.
3738 if (E->isCallToStdMove()) {
3739 HandleValue(E->getArg(0), /*AddressOf=*/false);
3740 return;
3741 }
3742
3743 Inherited::VisitCallExpr(E);
3744 }
3745
3746 void VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E) {
3747 Expr *Callee = E->getCallee();
3748
3749 if (isa<UnresolvedLookupExpr>(Callee))
3750 return Inherited::VisitCXXOperatorCallExpr(E);
3751
3752 Visit(Callee);
3753 for (auto Arg : E->arguments())
3754 HandleValue(Arg->IgnoreParenImpCasts(), false /*AddressOf*/);
3755 }
3756
3757 void VisitBinaryOperator(BinaryOperator *E) {
3758 // If a field assignment is detected, remove the field from the
3759 // uninitiailized field set.
3760 if (E->getOpcode() == BO_Assign)
3761 if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getLHS()))
3762 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()))
3763 if (!FD->getType()->isReferenceType())
3764 DeclsToRemove.push_back(FD);
3765
3766 if (E->isCompoundAssignmentOp()) {
3767 HandleValue(E->getLHS(), false /*AddressOf*/);
3768 Visit(E->getRHS());
3769 return;
3770 }
3771
3772 Inherited::VisitBinaryOperator(E);
3773 }
3774
3775 void VisitUnaryOperator(UnaryOperator *E) {
3776 if (E->isIncrementDecrementOp()) {
3777 HandleValue(E->getSubExpr(), false /*AddressOf*/);
3778 return;
3779 }
3780 if (E->getOpcode() == UO_AddrOf) {
3781 if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getSubExpr())) {
3782 HandleValue(ME->getBase(), true /*AddressOf*/);
3783 return;
3784 }
3785 }
3786
3787 Inherited::VisitUnaryOperator(E);
3788 }
3789 };
3790
3791 // Diagnose value-uses of fields to initialize themselves, e.g.
3792 // foo(foo)
3793 // where foo is not also a parameter to the constructor.
3794 // Also diagnose across field uninitialized use such as
3795 // x(y), y(x)
3796 // TODO: implement -Wuninitialized and fold this into that framework.
3797 static void DiagnoseUninitializedFields(
3798 Sema &SemaRef, const CXXConstructorDecl *Constructor) {
3799
3800 if (SemaRef.getDiagnostics().isIgnored(diag::warn_field_is_uninit,
3801 Constructor->getLocation())) {
3802 return;
3803 }
3804
3805 if (Constructor->isInvalidDecl())
3806 return;
3807
3808 const CXXRecordDecl *RD = Constructor->getParent();
3809
3810 if (RD->isDependentContext())
3811 return;
3812
3813 // Holds fields that are uninitialized.
3814 llvm::SmallPtrSet<ValueDecl*, 4> UninitializedFields;
3815
3816 // At the beginning, all fields are uninitialized.
3817 for (auto *I : RD->decls()) {
3818 if (auto *FD = dyn_cast<FieldDecl>(I)) {
3819 UninitializedFields.insert(FD);
3820 } else if (auto *IFD = dyn_cast<IndirectFieldDecl>(I)) {
3821 UninitializedFields.insert(IFD->getAnonField());
3822 }
3823 }
3824
3825 llvm::SmallPtrSet<QualType, 4> UninitializedBaseClasses;
3826 for (auto I : RD->bases())
3827 UninitializedBaseClasses.insert(I.getType().getCanonicalType());
3828
3829 if (UninitializedFields.empty() && UninitializedBaseClasses.empty())
3830 return;
3831
3832 UninitializedFieldVisitor UninitializedChecker(SemaRef,
3833 UninitializedFields,
3834 UninitializedBaseClasses);
3835
3836 for (const auto *FieldInit : Constructor->inits()) {
3837 if (UninitializedFields.empty() && UninitializedBaseClasses.empty())
3838 break;
3839
3840 Expr *InitExpr = FieldInit->getInit();
3841 if (!InitExpr)
3842 continue;
3843
3844 if (CXXDefaultInitExpr *Default =
3845 dyn_cast<CXXDefaultInitExpr>(InitExpr)) {
3846 InitExpr = Default->getExpr();
3847 if (!InitExpr)
3848 continue;
3849 // In class initializers will point to the constructor.
3850 UninitializedChecker.CheckInitializer(InitExpr, Constructor,
3851 FieldInit->getAnyMember(),
3852 FieldInit->getBaseClass());
3853 } else {
3854 UninitializedChecker.CheckInitializer(InitExpr, nullptr,
3855 FieldInit->getAnyMember(),
3856 FieldInit->getBaseClass());
3857 }
3858 }
3859 }
3860 } // namespace
3861
3862 /// Enter a new C++ default initializer scope. After calling this, the
3863 /// caller must call \ref ActOnFinishCXXInClassMemberInitializer, even if
3864 /// parsing or instantiating the initializer failed.
3865 void Sema::ActOnStartCXXInClassMemberInitializer() {
3866 // Create a synthetic function scope to represent the call to the constructor
3867 // that notionally surrounds a use of this initializer.
3868 PushFunctionScope();
3869 }
3870
3871 void Sema::ActOnStartTrailingRequiresClause(Scope *S, Declarator &D) {
3872 if (!D.isFunctionDeclarator())
3873 return;
3874 auto &FTI = D.getFunctionTypeInfo();
3875 if (!FTI.Params)
3876 return;
3877 for (auto &Param : ArrayRef<DeclaratorChunk::ParamInfo>(FTI.Params,
3878 FTI.NumParams)) {
3879 auto *ParamDecl = cast<NamedDecl>(Param.Param);
3880 if (ParamDecl->getDeclName())
3881 PushOnScopeChains(ParamDecl, S, /*AddToContext=*/false);
3882 }
3883 }
3884
3885 ExprResult Sema::ActOnFinishTrailingRequiresClause(ExprResult ConstraintExpr) {
3886 if (ConstraintExpr.isInvalid())
3887 return ExprError();
3888 return CorrectDelayedTyposInExpr(ConstraintExpr);
3889 }
3890
3891 /// This is invoked after parsing an in-class initializer for a
3892 /// non-static C++ class member, and after instantiating an in-class initializer
3893 /// in a class template. Such actions are deferred until the class is complete.
3894 void Sema::ActOnFinishCXXInClassMemberInitializer(Decl *D,
3895 SourceLocation InitLoc,
3896 Expr *InitExpr) {
3897 // Pop the notional constructor scope we created earlier.
3898 PopFunctionScopeInfo(nullptr, D);
3899
3900 FieldDecl *FD = dyn_cast<FieldDecl>(D);
3901 assert((isa<MSPropertyDecl>(D) || FD->getInClassInitStyle() != ICIS_NoInit) &&
3902 "must set init style when field is created");
3903
3904 if (!InitExpr) {
3905 D->setInvalidDecl();
3906 if (FD)
3907 FD->removeInClassInitializer();
3908 return;
3909 }
3910
3911 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) {
3912 FD->setInvalidDecl();
3913 FD->removeInClassInitializer();
3914 return;
3915 }
3916
3917 ExprResult Init = InitExpr;
3918 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) {
3919 InitializedEntity Entity =
3920 InitializedEntity::InitializeMemberFromDefaultMemberInitializer(FD);
3921 InitializationKind Kind =
3922 FD->getInClassInitStyle() == ICIS_ListInit
3923 ? InitializationKind::CreateDirectList(InitExpr->getBeginLoc(),
3924 InitExpr->getBeginLoc(),
3925 InitExpr->getEndLoc())
3926 : InitializationKind::CreateCopy(InitExpr->getBeginLoc(), InitLoc);
3927 InitializationSequence Seq(*this, Entity, Kind, InitExpr);
3928 Init = Seq.Perform(*this, Entity, Kind, InitExpr);
3929 if (Init.isInvalid()) {
3930 FD->setInvalidDecl();
3931 return;
3932 }
3933 }
3934
3935 // C++11 [class.base.init]p7:
3936 // The initialization of each base and member constitutes a
3937 // full-expression.
3938 Init = ActOnFinishFullExpr(Init.get(), InitLoc, /*DiscardedValue*/ false);
3939 if (Init.isInvalid()) {
3940 FD->setInvalidDecl();
3941 return;
3942 }
3943
3944 InitExpr = Init.get();
3945
3946 FD->setInClassInitializer(InitExpr);
3947 }
3948
3949 /// Find the direct and/or virtual base specifiers that
3950 /// correspond to the given base type, for use in base initialization
3951 /// within a constructor.
3952 static bool FindBaseInitializer(Sema &SemaRef,
3953 CXXRecordDecl *ClassDecl,
3954 QualType BaseType,
3955 const CXXBaseSpecifier *&DirectBaseSpec,
3956 const CXXBaseSpecifier *&VirtualBaseSpec) {
3957 // First, check for a direct base class.
3958 DirectBaseSpec = nullptr;
3959 for (const auto &Base : ClassDecl->bases()) {
3960 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base.getType())) {
3961 // We found a direct base of this type. That's what we're
3962 // initializing.
3963 DirectBaseSpec = &Base;
3964 break;
3965 }
3966 }
3967
3968 // Check for a virtual base class.
3969 // FIXME: We might be able to short-circuit this if we know in advance that
3970 // there are no virtual bases.
3971 VirtualBaseSpec = nullptr;
3972 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) {
3973 // We haven't found a base yet; search the class hierarchy for a
3974 // virtual base class.
3975 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
3976 /*DetectVirtual=*/false);
3977 if (SemaRef.IsDerivedFrom(ClassDecl->getLocation(),
3978 SemaRef.Context.getTypeDeclType(ClassDecl),
3979 BaseType, Paths)) {
3980 for (CXXBasePaths::paths_iterator Path = Paths.begin();
3981 Path != Paths.end(); ++Path) {
3982 if (Path->back().Base->isVirtual()) {
3983 VirtualBaseSpec = Path->back().Base;
3984 break;
3985 }
3986 }
3987 }
3988 }
3989
3990 return DirectBaseSpec || VirtualBaseSpec;
3991 }
3992
3993 /// Handle a C++ member initializer using braced-init-list syntax.
3994 MemInitResult
3995 Sema::ActOnMemInitializer(Decl *ConstructorD,
3996 Scope *S,
3997 CXXScopeSpec &SS,
3998 IdentifierInfo *MemberOrBase,
3999 ParsedType TemplateTypeTy,
4000 const DeclSpec &DS,
4001 SourceLocation IdLoc,
4002 Expr *InitList,
4003 SourceLocation EllipsisLoc) {
4004 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
4005 DS, IdLoc, InitList,
4006 EllipsisLoc);
4007 }
4008
4009 /// Handle a C++ member initializer using parentheses syntax.
4010 MemInitResult
4011 Sema::ActOnMemInitializer(Decl *ConstructorD,
4012 Scope *S,
4013 CXXScopeSpec &SS,
4014 IdentifierInfo *MemberOrBase,
4015 ParsedType TemplateTypeTy,
4016 const DeclSpec &DS,
4017 SourceLocation IdLoc,
4018 SourceLocation LParenLoc,
4019 ArrayRef<Expr *> Args,
4020 SourceLocation RParenLoc,
4021 SourceLocation EllipsisLoc) {
4022 Expr *List = ParenListExpr::Create(Context, LParenLoc, Args, RParenLoc);
4023 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
4024 DS, IdLoc, List, EllipsisLoc);
4025 }
4026
4027 namespace {
4028
4029 // Callback to only accept typo corrections that can be a valid C++ member
4030 // intializer: either a non-static field member or a base class.
4031 class MemInitializerValidatorCCC final : public CorrectionCandidateCallback {
4032 public:
4033 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl)
4034 : ClassDecl(ClassDecl) {}
4035
4036 bool ValidateCandidate(const TypoCorrection &candidate) override {
4037 if (NamedDecl *ND = candidate.getCorrectionDecl()) {
4038 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND))
4039 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl);
4040 return isa<TypeDecl>(ND);
4041 }
4042 return false;
4043 }
4044
4045 std::unique_ptr<CorrectionCandidateCallback> clone() override {
4046 return std::make_unique<MemInitializerValidatorCCC>(*this);
4047 }
4048
4049 private:
4050 CXXRecordDecl *ClassDecl;
4051 };
4052
4053 }
4054
4055 ValueDecl *Sema::tryLookupCtorInitMemberDecl(CXXRecordDecl *ClassDecl,
4056 CXXScopeSpec &SS,
4057 ParsedType TemplateTypeTy,
4058 IdentifierInfo *MemberOrBase) {
4059 if (SS.getScopeRep() || TemplateTypeTy)
4060 return nullptr;
4061 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase);
4062 if (Result.empty())
4063 return nullptr;
4064 ValueDecl *Member;
4065 if ((Member = dyn_cast<FieldDecl>(Result.front())) ||
4066 (Member = dyn_cast<IndirectFieldDecl>(Result.front())))
4067 return Member;
4068 return nullptr;
4069 }
4070
4071 /// Handle a C++ member initializer.
4072 MemInitResult
4073 Sema::BuildMemInitializer(Decl *ConstructorD,
4074 Scope *S,
4075 CXXScopeSpec &SS,
4076 IdentifierInfo *MemberOrBase,
4077 ParsedType TemplateTypeTy,
4078 const DeclSpec &DS,
4079 SourceLocation IdLoc,
4080 Expr *Init,
4081 SourceLocation EllipsisLoc) {
4082 ExprResult Res = CorrectDelayedTyposInExpr(Init);
4083 if (!Res.isUsable())
4084 return true;
4085 Init = Res.get();
4086
4087 if (!ConstructorD)
4088 return true;
4089
4090 AdjustDeclIfTemplate(ConstructorD);
4091
4092 CXXConstructorDecl *Constructor
4093 = dyn_cast<CXXConstructorDecl>(ConstructorD);
4094 if (!Constructor) {
4095 // The user wrote a constructor initializer on a function that is
4096 // not a C++ constructor. Ignore the error for now, because we may
4097 // have more member initializers coming; we'll diagnose it just
4098 // once in ActOnMemInitializers.
4099 return true;
4100 }
4101
4102 CXXRecordDecl *ClassDecl = Constructor->getParent();
4103
4104 // C++ [class.base.init]p2:
4105 // Names in a mem-initializer-id are looked up in the scope of the
4106 // constructor's class and, if not found in that scope, are looked
4107 // up in the scope containing the constructor's definition.
4108 // [Note: if the constructor's class contains a member with the
4109 // same name as a direct or virtual base class of the class, a
4110 // mem-initializer-id naming the member or base class and composed
4111 // of a single identifier refers to the class member. A
4112 // mem-initializer-id for the hidden base class may be specified
4113 // using a qualified name. ]
4114
4115 // Look for a member, first.
4116 if (ValueDecl *Member = tryLookupCtorInitMemberDecl(
4117 ClassDecl, SS, TemplateTypeTy, MemberOrBase)) {
4118 if (EllipsisLoc.isValid())
4119 Diag(EllipsisLoc, diag::err_pack_expansion_member_init)
4120 << MemberOrBase
4121 << SourceRange(IdLoc, Init->getSourceRange().getEnd());
4122
4123 return BuildMemberInitializer(Member, Init, IdLoc);
4124 }
4125 // It didn't name a member, so see if it names a class.
4126 QualType BaseType;
4127 TypeSourceInfo *TInfo = nullptr;
4128
4129 if (TemplateTypeTy) {
4130 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo);
4131 if (BaseType.isNull())
4132 return true;
4133 } else if (DS.getTypeSpecType() == TST_decltype) {
4134 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc());
4135 } else if (DS.getTypeSpecType() == TST_decltype_auto) {
4136 Diag(DS.getTypeSpecTypeLoc(), diag::err_decltype_auto_invalid);
4137 return true;
4138 } else {
4139 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName);
4140 LookupParsedName(R, S, &SS);
4141
4142 TypeDecl *TyD = R.getAsSingle<TypeDecl>();
4143 if (!TyD) {
4144 if (R.isAmbiguous()) return true;
4145
4146 // We don't want access-control diagnostics here.
4147 R.suppressDiagnostics();
4148
4149 if (SS.isSet() && isDependentScopeSpecifier(SS)) {
4150 bool NotUnknownSpecialization = false;
4151 DeclContext *DC = computeDeclContext(SS, false);
4152 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC))
4153 NotUnknownSpecialization = !Record->hasAnyDependentBases();
4154
4155 if (!NotUnknownSpecialization) {
4156 // When the scope specifier can refer to a member of an unknown
4157 // specialization, we take it as a type name.
4158 BaseType = CheckTypenameType(ETK_None, SourceLocation(),
4159 SS.getWithLocInContext(Context),
4160 *MemberOrBase, IdLoc);
4161 if (BaseType.isNull())
4162 return true;
4163
4164 TInfo = Context.CreateTypeSourceInfo(BaseType);
4165 DependentNameTypeLoc TL =
4166 TInfo->getTypeLoc().castAs<DependentNameTypeLoc>();
4167 if (!TL.isNull()) {
4168 TL.setNameLoc(IdLoc);
4169 TL.setElaboratedKeywordLoc(SourceLocation());
4170 TL.setQualifierLoc(SS.getWithLocInContext(Context));
4171 }
4172
4173 R.clear();
4174 R.setLookupName(MemberOrBase);
4175 }
4176 }
4177
4178 // If no results were found, try to correct typos.
4179 TypoCorrection Corr;
4180 MemInitializerValidatorCCC CCC(ClassDecl);
4181 if (R.empty() && BaseType.isNull() &&
4182 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS,
4183 CCC, CTK_ErrorRecovery, ClassDecl))) {
4184 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) {
4185 // We have found a non-static data member with a similar
4186 // name to what was typed; complain and initialize that
4187 // member.
4188 diagnoseTypo(Corr,
4189 PDiag(diag::err_mem_init_not_member_or_class_suggest)
4190 << MemberOrBase << true);
4191 return BuildMemberInitializer(Member, Init, IdLoc);
4192 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) {
4193 const CXXBaseSpecifier *DirectBaseSpec;
4194 const CXXBaseSpecifier *VirtualBaseSpec;
4195 if (FindBaseInitializer(*this, ClassDecl,
4196 Context.getTypeDeclType(Type),
4197 DirectBaseSpec, VirtualBaseSpec)) {
4198 // We have found a direct or virtual base class with a
4199 // similar name to what was typed; complain and initialize
4200 // that base class.
4201 diagnoseTypo(Corr,
4202 PDiag(diag::err_mem_init_not_member_or_class_suggest)
4203 << MemberOrBase << false,
4204 PDiag() /*Suppress note, we provide our own.*/);
4205
4206 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec ? DirectBaseSpec
4207 : VirtualBaseSpec;
4208 Diag(BaseSpec->getBeginLoc(), diag::note_base_class_specified_here)
4209 << BaseSpec->getType() << BaseSpec->getSourceRange();
4210
4211 TyD = Type;
4212 }
4213 }
4214 }
4215
4216 if (!TyD && BaseType.isNull()) {
4217 Diag(IdLoc, diag::err_mem_init_not_member_or_class)
4218 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd());
4219 return true;
4220 }
4221 }
4222
4223 if (BaseType.isNull()) {
4224 BaseType = Context.getTypeDeclType(TyD);
4225 MarkAnyDeclReferenced(TyD->getLocation(), TyD, /*OdrUse=*/false);
4226 if (SS.isSet()) {
4227 BaseType = Context.getElaboratedType(ETK_None, SS.getScopeRep(),
4228 BaseType);
4229 TInfo = Context.CreateTypeSourceInfo(BaseType);
4230 ElaboratedTypeLoc TL = TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>();
4231 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(IdLoc);
4232 TL.setElaboratedKeywordLoc(SourceLocation());
4233 TL.setQualifierLoc(SS.getWithLocInContext(Context));
4234 }
4235 }
4236 }
4237
4238 if (!TInfo)
4239 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc);
4240
4241 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc);
4242 }
4243
4244 MemInitResult
4245 Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init,
4246 SourceLocation IdLoc) {
4247 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member);
4248 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member);
4249 assert((DirectMember || IndirectMember) &&
4250 "Member must be a FieldDecl or IndirectFieldDecl");
4251
4252 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
4253 return true;
4254
4255 if (Member->isInvalidDecl())
4256 return true;
4257
4258 MultiExprArg Args;
4259 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
4260 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
4261 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) {
4262 Args = MultiExprArg(InitList->getInits(), InitList->getNumInits());
4263 } else {
4264 // Template instantiation doesn't reconstruct ParenListExprs for us.
4265 Args = Init;
4266 }
4267
4268 SourceRange InitRange = Init->getSourceRange();
4269
4270 if (Member->getType()->isDependentType() || Init->isTypeDependent()) {
4271 // Can't check initialization for a member of dependent type or when
4272 // any of the arguments are type-dependent expressions.
4273 DiscardCleanupsInEvaluationContext();
4274 } else {
4275 bool InitList = false;
4276 if (isa<InitListExpr>(Init)) {
4277 InitList = true;
4278 Args = Init;
4279 }
4280
4281 // Initialize the member.
4282 InitializedEntity MemberEntity =
4283 DirectMember ? InitializedEntity::InitializeMember(DirectMember, nullptr)
4284 : InitializedEntity::InitializeMember(IndirectMember,
4285 nullptr);
4286 InitializationKind Kind =
4287 InitList ? InitializationKind::CreateDirectList(
4288 IdLoc, Init->getBeginLoc(), Init->getEndLoc())
4289 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(),
4290 InitRange.getEnd());
4291
4292 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args);
4293 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args,
4294 nullptr);
4295 if (MemberInit.isInvalid())
4296 return true;
4297
4298 // C++11 [class.base.init]p7:
4299 // The initialization of each base and member constitutes a
4300 // full-expression.
4301 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin(),
4302 /*DiscardedValue*/ false);
4303 if (MemberInit.isInvalid())
4304 return true;
4305
4306 Init = MemberInit.get();
4307 }
4308
4309 if (DirectMember) {
4310 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc,
4311 InitRange.getBegin(), Init,
4312 InitRange.getEnd());
4313 } else {
4314 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc,
4315 InitRange.getBegin(), Init,
4316 InitRange.getEnd());
4317 }
4318 }
4319
4320 MemInitResult
4321 Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init,
4322 CXXRecordDecl *ClassDecl) {
4323 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin();
4324 if (!LangOpts.CPlusPlus11)
4325 return Diag(NameLoc, diag::err_delegating_ctor)
4326 << TInfo->getTypeLoc().getLocalSourceRange();
4327 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor);
4328
4329 bool InitList = true;
4330 MultiExprArg Args = Init;
4331 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
4332 InitList = false;
4333 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
4334 }
4335
4336 SourceRange InitRange = Init->getSourceRange();
4337 // Initialize the object.
4338 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation(
4339 QualType(ClassDecl->getTypeForDecl(), 0));
4340 InitializationKind Kind =
4341 InitList ? InitializationKind::CreateDirectList(
4342 NameLoc, Init->getBeginLoc(), Init->getEndLoc())
4343 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(),
4344 InitRange.getEnd());
4345 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args);
4346 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind,
4347 Args, nullptr);
4348 if (DelegationInit.isInvalid())
4349 return true;
4350
4351 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() &&
4352 "Delegating constructor with no target?");
4353
4354 // C++11 [class.base.init]p7:
4355 // The initialization of each base and member constitutes a
4356 // full-expression.
4357 DelegationInit = ActOnFinishFullExpr(
4358 DelegationInit.get(), InitRange.getBegin(), /*DiscardedValue*/ false);
4359 if (DelegationInit.isInvalid())
4360 return true;
4361
4362 // If we are in a dependent context, template instantiation will
4363 // perform this type-checking again. Just save the arguments that we
4364 // received in a ParenListExpr.
4365 // FIXME: This isn't quite ideal, since our ASTs don't capture all
4366 // of the information that we have about the base
4367 // initializer. However, deconstructing the ASTs is a dicey process,
4368 // and this approach is far more likely to get the corner cases right.
4369 if (CurContext->isDependentContext())
4370 DelegationInit = Init;
4371
4372 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(),
4373 DelegationInit.getAs<Expr>(),
4374 InitRange.getEnd());
4375 }
4376
4377 MemInitResult
4378 Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo,
4379 Expr *Init, CXXRecordDecl *ClassDecl,
4380 SourceLocation EllipsisLoc) {
4381 SourceLocation BaseLoc
4382 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin();
4383
4384 if (!BaseType->isDependentType() && !BaseType->isRecordType())
4385 return Diag(BaseLoc, diag::err_base_init_does_not_name_class)
4386 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
4387
4388 // C++ [class.base.init]p2:
4389 // [...] Unless the mem-initializer-id names a nonstatic data
4390 // member of the constructor's class or a direct or virtual base
4391 // of that class, the mem-initializer is ill-formed. A
4392 // mem-initializer-list can initialize a base class using any
4393 // name that denotes that base class type.
4394 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent();
4395
4396 SourceRange InitRange = Init->getSourceRange();
4397 if (EllipsisLoc.isValid()) {
4398 // This is a pack expansion.
4399 if (!BaseType->containsUnexpandedParameterPack()) {
4400 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
4401 << SourceRange(BaseLoc, InitRange.getEnd());
4402
4403 EllipsisLoc = SourceLocation();
4404 }
4405 } else {
4406 // Check for any unexpanded parameter packs.
4407 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer))
4408 return true;
4409
4410 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
4411 return true;
4412 }
4413
4414 // Check for direct and virtual base classes.
4415 const CXXBaseSpecifier *DirectBaseSpec = nullptr;
4416 const CXXBaseSpecifier *VirtualBaseSpec = nullptr;
4417 if (!Dependent) {
4418 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0),
4419 BaseType))
4420 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl);
4421
4422 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec,
4423 VirtualBaseSpec);
4424
4425 // C++ [base.class.init]p2:
4426 // Unless the mem-initializer-id names a nonstatic data member of the
4427 // constructor's class or a direct or virtual base of that class, the
4428 // mem-initializer is ill-formed.
4429 if (!DirectBaseSpec && !VirtualBaseSpec) {
4430 // If the class has any dependent bases, then it's possible that
4431 // one of those types will resolve to the same type as
4432 // BaseType. Therefore, just treat this as a dependent base
4433 // class initialization. FIXME: Should we try to check the
4434 // initialization anyway? It seems odd.
4435 if (ClassDecl->hasAnyDependentBases())
4436 Dependent = true;
4437 else
4438 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual)
4439 << BaseType << Context.getTypeDeclType(ClassDecl)
4440 << BaseTInfo->getTypeLoc().getLocalSourceRange();
4441 }
4442 }
4443
4444 if (Dependent) {
4445 DiscardCleanupsInEvaluationContext();
4446
4447 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
4448 /*IsVirtual=*/false,
4449 InitRange.getBegin(), Init,
4450 InitRange.getEnd(), EllipsisLoc);
4451 }
4452
4453 // C++ [base.class.init]p2:
4454 // If a mem-initializer-id is ambiguous because it designates both
4455 // a direct non-virtual base class and an inherited virtual base
4456 // class, the mem-initializer is ill-formed.
4457 if (DirectBaseSpec && VirtualBaseSpec)
4458 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual)
4459 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
4460
4461 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec;
4462 if (!BaseSpec)
4463 BaseSpec = VirtualBaseSpec;
4464
4465 // Initialize the base.
4466 bool InitList = true;
4467 MultiExprArg Args = Init;
4468 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
4469 InitList = false;
4470 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
4471 }
4472
4473 InitializedEntity BaseEntity =
4474 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec);
4475 InitializationKind Kind =
4476 InitList ? InitializationKind::CreateDirectList(BaseLoc)
4477 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(),
4478 InitRange.getEnd());
4479 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args);
4480 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, nullptr);
4481 if (BaseInit.isInvalid())
4482 return true;
4483
4484 // C++11 [class.base.init]p7:
4485 // The initialization of each base and member constitutes a
4486 // full-expression.
4487 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin(),
4488 /*DiscardedValue*/ false);
4489 if (BaseInit.isInvalid())
4490 return true;
4491
4492 // If we are in a dependent context, template instantiation will
4493 // perform this type-checking again. Just save the arguments that we
4494 // received in a ParenListExpr.
4495 // FIXME: This isn't quite ideal, since our ASTs don't capture all
4496 // of the information that we have about the base
4497 // initializer. However, deconstructing the ASTs is a dicey process,
4498 // and this approach is far more likely to get the corner cases right.
4499 if (CurContext->isDependentContext())
4500 BaseInit = Init;
4501
4502 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
4503 BaseSpec->isVirtual(),
4504 InitRange.getBegin(),
4505 BaseInit.getAs<Expr>(),
4506 InitRange.getEnd(), EllipsisLoc);
4507 }
4508
4509 // Create a static_cast<T&&>(expr).
4510 static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) {
4511 if (T.isNull()) T = E->getType();
4512 QualType TargetType = SemaRef.BuildReferenceType(
4513 T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName());
4514 SourceLocation ExprLoc = E->getBeginLoc();
4515 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo(
4516 TargetType, ExprLoc);
4517
4518 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E,
4519 SourceRange(ExprLoc, ExprLoc),
4520 E->getSourceRange()).get();
4521 }
4522
4523 /// ImplicitInitializerKind - How an implicit base or member initializer should
4524 /// initialize its base or member.
4525 enum ImplicitInitializerKind {
4526 IIK_Default,
4527 IIK_Copy,
4528 IIK_Move,
4529 IIK_Inherit
4530 };
4531
4532 static bool
4533 BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
4534 ImplicitInitializerKind ImplicitInitKind,
4535 CXXBaseSpecifier *BaseSpec,
4536 bool IsInheritedVirtualBase,
4537 CXXCtorInitializer *&CXXBaseInit) {
4538 InitializedEntity InitEntity
4539 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec,
4540 IsInheritedVirtualBase);
4541
4542 ExprResult BaseInit;
4543
4544 switch (ImplicitInitKind) {
4545 case IIK_Inherit:
4546 case IIK_Default: {
4547 InitializationKind InitKind
4548 = InitializationKind::CreateDefault(Constructor->getLocation());
4549 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None);
4550 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None);
4551 break;
4552 }
4553
4554 case IIK_Move:
4555 case IIK_Copy: {
4556 bool Moving = ImplicitInitKind == IIK_Move;
4557 ParmVarDecl *Param = Constructor->getParamDecl(0);
4558 QualType ParamType = Param->getType().getNonReferenceType();
4559
4560 Expr *CopyCtorArg =
4561 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
4562 SourceLocation(), Param, false,
4563 Constructor->getLocation(), ParamType,
4564 VK_LValue, nullptr);
4565
4566 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg));
4567
4568 // Cast to the base class to avoid ambiguities.
4569 QualType ArgTy =
4570 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(),
4571 ParamType.getQualifiers());
4572
4573 if (Moving) {
4574 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg);
4575 }
4576
4577 CXXCastPath BasePath;
4578 BasePath.push_back(BaseSpec);
4579 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy,
4580 CK_UncheckedDerivedToBase,
4581 Moving ? VK_XValue : VK_LValue,
4582 &BasePath).get();
4583
4584 InitializationKind InitKind
4585 = InitializationKind::CreateDirect(Constructor->getLocation(),
4586 SourceLocation(), SourceLocation());
4587 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg);
4588 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg);
4589 break;
4590 }
4591 }
4592
4593 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit);
4594 if (BaseInit.isInvalid())
4595 return true;
4596
4597 CXXBaseInit =
4598 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
4599 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(),
4600 SourceLocation()),
4601 BaseSpec->isVirtual(),
4602 SourceLocation(),
4603 BaseInit.getAs<Expr>(),
4604 SourceLocation(),
4605 SourceLocation());
4606
4607 return false;
4608 }
4609
4610 static bool RefersToRValueRef(Expr *MemRef) {
4611 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl();
4612 return Referenced->getType()->isRValueReferenceType();
4613 }
4614
4615 static bool
4616 BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
4617 ImplicitInitializerKind ImplicitInitKind,
4618 FieldDecl *Field, IndirectFieldDecl *Indirect,
4619 CXXCtorInitializer *&CXXMemberInit) {
4620 if (Field->isInvalidDecl())
4621 return true;
4622
4623 SourceLocation Loc = Constructor->getLocation();
4624
4625 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) {
4626 bool Moving = ImplicitInitKind == IIK_Move;
4627 ParmVarDecl *Param = Constructor->getParamDecl(0);
4628 QualType ParamType = Param->getType().getNonReferenceType();
4629
4630 // Suppress copying zero-width bitfields.
4631 if (Field->isZeroLengthBitField(SemaRef.Context))
4632 return false;
4633
4634 Expr *MemberExprBase =
4635 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
4636 SourceLocation(), Param, false,
4637 Loc, ParamType, VK_LValue, nullptr);
4638
4639 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase));
4640
4641 if (Moving) {
4642 MemberExprBase = CastForMoving(SemaRef, MemberExprBase);
4643 }
4644
4645 // Build a reference to this field within the parameter.
4646 CXXScopeSpec SS;
4647 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc,
4648 Sema::LookupMemberName);
4649 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect)
4650 : cast<ValueDecl>(Field), AS_public);
4651 MemberLookup.resolveKind();
4652 ExprResult CtorArg
4653 = SemaRef.BuildMemberReferenceExpr(MemberExprBase,
4654 ParamType, Loc,
4655 /*IsArrow=*/false,
4656 SS,
4657 /*TemplateKWLoc=*/SourceLocation(),
4658 /*FirstQualifierInScope=*/nullptr,
4659 MemberLookup,
4660 /*TemplateArgs=*/nullptr,
4661 /*S*/nullptr);
4662 if (CtorArg.isInvalid())
4663 return true;
4664
4665 // C++11 [class.copy]p15:
4666 // - if a member m has rvalue reference type T&&, it is direct-initialized
4667 // with static_cast<T&&>(x.m);
4668 if (RefersToRValueRef(CtorArg.get())) {
4669 CtorArg = CastForMoving(SemaRef, CtorArg.get());
4670 }
4671
4672 InitializedEntity Entity =
4673 Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr,
4674 /*Implicit*/ true)
4675 : InitializedEntity::InitializeMember(Field, nullptr,
4676 /*Implicit*/ true);
4677
4678 // Direct-initialize to use the copy constructor.
4679 InitializationKind InitKind =
4680 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation());
4681
4682 Expr *CtorArgE = CtorArg.getAs<Expr>();
4683 InitializationSequence InitSeq(SemaRef, Entity, InitKind, CtorArgE);
4684 ExprResult MemberInit =
4685 InitSeq.Perform(SemaRef, Entity, InitKind, MultiExprArg(&CtorArgE, 1));
4686 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
4687 if (MemberInit.isInvalid())
4688 return true;
4689
4690 if (Indirect)
4691 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(
4692 SemaRef.Context, Indirect, Loc, Loc, MemberInit.getAs<Expr>(), Loc);
4693 else
4694 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(
4695 SemaRef.Context, Field, Loc, Loc, MemberInit.getAs<Expr>(), Loc);
4696 return false;
4697 }
4698
4699 assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) &&
4700 "Unhandled implicit init kind!");
4701
4702 QualType FieldBaseElementType =
4703 SemaRef.Context.getBaseElementType(Field->getType());
4704
4705 if (FieldBaseElementType->isRecordType()) {
4706 InitializedEntity InitEntity =
4707 Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr,
4708 /*Implicit*/ true)
4709 : InitializedEntity::InitializeMember(Field, nullptr,
4710 /*Implicit*/ true);
4711 InitializationKind InitKind =
4712 InitializationKind::CreateDefault(Loc);
4713
4714 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None);
4715 ExprResult MemberInit =
4716 InitSeq.Perform(SemaRef, InitEntity, InitKind, None);
4717
4718 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
4719 if (MemberInit.isInvalid())
4720 return true;
4721
4722 if (Indirect)
4723 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
4724 Indirect, Loc,
4725 Loc,
4726 MemberInit.get(),
4727 Loc);
4728 else
4729 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
4730 Field, Loc, Loc,
4731 MemberInit.get(),
4732 Loc);
4733 return false;
4734 }
4735
4736 if (!Field->getParent()->isUnion()) {
4737 if (FieldBaseElementType->isReferenceType()) {
4738 SemaRef.Diag(Constructor->getLocation(),
4739 diag::err_uninitialized_member_in_ctor)
4740 << (int)Constructor->isImplicit()
4741 << SemaRef.Context.getTagDeclType(Constructor->getParent())
4742 << 0 << Field->getDeclName();
4743 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
4744 return true;
4745 }
4746
4747 if (FieldBaseElementType.isConstQualified()) {
4748 SemaRef.Diag(Constructor->getLocation(),
4749 diag::err_uninitialized_member_in_ctor)
4750 << (int)Constructor->isImplicit()
4751 << SemaRef.Context.getTagDeclType(Constructor->getParent())
4752 << 1 << Field->getDeclName();
4753 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
4754 return true;
4755 }
4756 }
4757
4758 if (FieldBaseElementType.hasNonTrivialObjCLifetime()) {
4759 // ARC and Weak:
4760 // Default-initialize Objective-C pointers to NULL.
4761 CXXMemberInit
4762 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field,
4763 Loc, Loc,
4764 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()),
4765 Loc);
4766 return false;
4767 }
4768
4769 // Nothing to initialize.
4770 CXXMemberInit = nullptr;
4771 return false;
4772 }
4773
4774 namespace {
4775 struct BaseAndFieldInfo {
4776 Sema &S;
4777 CXXConstructorDecl *Ctor;
4778 bool AnyErrorsInInits;
4779 ImplicitInitializerKind IIK;
4780 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields;
4781 SmallVector<CXXCtorInitializer*, 8> AllToInit;
4782 llvm::DenseMap<TagDecl*, FieldDecl*> ActiveUnionMember;
4783
4784 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits)
4785 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) {
4786 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted();
4787 if (Ctor->getInheritedConstructor())
4788 IIK = IIK_Inherit;
4789 else if (Generated && Ctor->isCopyConstructor())
4790 IIK = IIK_Copy;
4791 else if (Generated && Ctor->isMoveConstructor())
4792 IIK = IIK_Move;
4793 else
4794 IIK = IIK_Default;
4795 }
4796
4797 bool isImplicitCopyOrMove() const {
4798 switch (IIK) {
4799 case IIK_Copy:
4800 case IIK_Move:
4801 return true;
4802
4803 case IIK_Default:
4804 case IIK_Inherit:
4805 return false;
4806 }
4807
4808 llvm_unreachable("Invalid ImplicitInitializerKind!");
4809 }
4810
4811 bool addFieldInitializer(CXXCtorInitializer *Init) {
4812 AllToInit.push_back(Init);
4813
4814 // Check whether this initializer makes the field "used".
4815 if (Init->getInit()->HasSideEffects(S.Context))
4816 S.UnusedPrivateFields.remove(Init->getAnyMember());
4817
4818 return false;
4819 }
4820
4821 bool isInactiveUnionMember(FieldDecl *Field) {
4822 RecordDecl *Record = Field->getParent();
4823 if (!Record->isUnion())
4824 return false;
4825
4826 if (FieldDecl *Active =
4827 ActiveUnionMember.lookup(Record->getCanonicalDecl()))
4828 return Active != Field->getCanonicalDecl();
4829
4830 // In an implicit copy or move constructor, ignore any in-class initializer.
4831 if (isImplicitCopyOrMove())
4832 return true;
4833
4834 // If there's no explicit initialization, the field is active only if it
4835 // has an in-class initializer...
4836 if (Field->hasInClassInitializer())
4837 return false;
4838 // ... or it's an anonymous struct or union whose class has an in-class
4839 // initializer.
4840 if (!Field->isAnonymousStructOrUnion())
4841 return true;
4842 CXXRecordDecl *FieldRD = Field->getType()->getAsCXXRecordDecl();
4843 return !FieldRD->hasInClassInitializer();
4844 }
4845
4846 /// Determine whether the given field is, or is within, a union member
4847 /// that is inactive (because there was an initializer given for a different
4848 /// member of the union, or because the union was not initialized at all).
4849 bool isWithinInactiveUnionMember(FieldDecl *Field,
4850 IndirectFieldDecl *Indirect) {
4851 if (!Indirect)
4852 return isInactiveUnionMember(Field);
4853
4854 for (auto *C : Indirect->chain()) {
4855 FieldDecl *Field = dyn_cast<FieldDecl>(C);
4856 if (Field && isInactiveUnionMember(Field))
4857 return true;
4858 }
4859 return false;
4860 }
4861 };
4862 }
4863
4864 /// Determine whether the given type is an incomplete or zero-lenfgth
4865 /// array type.
4866 static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) {
4867 if (T->isIncompleteArrayType())
4868 return true;
4869
4870 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) {
4871 if (!ArrayT->getSize())
4872 return true;
4873
4874 T = ArrayT->getElementType();
4875 }
4876
4877 return false;
4878 }
4879
4880 static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info,
4881 FieldDecl *Field,
4882 IndirectFieldDecl *Indirect = nullptr) {
4883 if (Field->isInvalidDecl())
4884 return false;
4885
4886 // Overwhelmingly common case: we have a direct initializer for this field.
4887 if (CXXCtorInitializer *Init =
4888 Info.AllBaseFields.lookup(Field->getCanonicalDecl()))
4889 return Info.addFieldInitializer(Init);
4890
4891 // C++11 [class.base.init]p8:
4892 // if the entity is a non-static data member that has a
4893 // brace-or-equal-initializer and either
4894 // -- the constructor's class is a union and no other variant member of that
4895 // union is designated by a mem-initializer-id or
4896 // -- the constructor's class is not a union, and, if the entity is a member
4897 // of an anonymous union, no other member of that union is designated by
4898 // a mem-initializer-id,
4899 // the entity is initialized as specified in [dcl.init].
4900 //
4901 // We also apply the same rules to handle anonymous structs within anonymous
4902 // unions.
4903 if (Info.isWithinInactiveUnionMember(Field, Indirect))
4904 return false;
4905
4906 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) {
4907 ExprResult DIE =
4908 SemaRef.BuildCXXDefaultInitExpr(Info.Ctor->getLocation(), Field);
4909 if (DIE.isInvalid())
4910 return true;
4911
4912 auto Entity = InitializedEntity::InitializeMember(Field, nullptr, true);
4913 SemaRef.checkInitializerLifetime(Entity, DIE.get());
4914
4915 CXXCtorInitializer *Init;
4916 if (Indirect)
4917 Init = new (SemaRef.Context)
4918 CXXCtorInitializer(SemaRef.Context, Indirect, SourceLocation(),
4919 SourceLocation(), DIE.get(), SourceLocation());
4920 else
4921 Init = new (SemaRef.Context)
4922 CXXCtorInitializer(SemaRef.Context, Field, SourceLocation(),
4923 SourceLocation(), DIE.get(), SourceLocation());
4924 return Info.addFieldInitializer(Init);
4925 }
4926
4927 // Don't initialize incomplete or zero-length arrays.
4928 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType()))
4929 return false;
4930
4931 // Don't try to build an implicit initializer if there were semantic
4932 // errors in any of the initializers (and therefore we might be
4933 // missing some that the user actually wrote).
4934 if (Info.AnyErrorsInInits)
4935 return false;
4936
4937 CXXCtorInitializer *Init = nullptr;
4938 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field,
4939 Indirect, Init))
4940 return true;
4941
4942 if (!Init)
4943 return false;
4944
4945 return Info.addFieldInitializer(Init);
4946 }
4947
4948 bool
4949 Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor,
4950 CXXCtorInitializer *Initializer) {
4951 assert(Initializer->isDelegatingInitializer());
4952 Constructor->setNumCtorInitializers(1);
4953 CXXCtorInitializer **initializer =
4954 new (Context) CXXCtorInitializer*[1];
4955 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*));
4956 Constructor->setCtorInitializers(initializer);
4957
4958 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) {
4959 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor);
4960 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation());
4961 }
4962
4963 DelegatingCtorDecls.push_back(Constructor);
4964
4965 DiagnoseUninitializedFields(*this, Constructor);
4966
4967 return false;
4968 }
4969
4970 bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors,
4971 ArrayRef<CXXCtorInitializer *> Initializers) {
4972 if (Constructor->isDependentContext()) {
4973 // Just store the initializers as written, they will be checked during
4974 // instantiation.
4975 if (!Initializers.empty()) {
4976 Constructor->setNumCtorInitializers(Initializers.size());
4977 CXXCtorInitializer **baseOrMemberInitializers =
4978 new (Context) CXXCtorInitializer*[Initializers.size()];
4979 memcpy(baseOrMemberInitializers, Initializers.data(),
4980 Initializers.size() * sizeof(CXXCtorInitializer*));
4981 Constructor->setCtorInitializers(baseOrMemberInitializers);
4982 }
4983
4984 // Let template instantiation know whether we had errors.
4985 if (AnyErrors)
4986 Constructor->setInvalidDecl();
4987
4988 return false;
4989 }
4990
4991 BaseAndFieldInfo Info(*this, Constructor, AnyErrors);
4992
4993 // We need to build the initializer AST according to order of construction
4994 // and not what user specified in the Initializers list.
4995 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition();
4996 if (!ClassDecl)
4997 return true;
4998
4999 bool HadError = false;
5000
5001 for (unsigned i = 0; i < Initializers.size(); i++) {
5002 CXXCtorInitializer *Member = Initializers[i];
5003
5004 if (Member->isBaseInitializer())
5005 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member;
5006 else {
5007 Info.AllBaseFields[Member->getAnyMember()->getCanonicalDecl()] = Member;
5008
5009 if (IndirectFieldDecl *F = Member->getIndirectMember()) {
5010 for (auto *C : F->chain()) {
5011 FieldDecl *FD = dyn_cast<FieldDecl>(C);
5012 if (FD && FD->getParent()->isUnion())
5013 Info.ActiveUnionMember.insert(std::make_pair(
5014 FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl()));
5015 }
5016 } else if (FieldDecl *FD = Member->getMember()) {
5017 if (FD->getParent()->isUnion())
5018 Info.ActiveUnionMember.insert(std::make_pair(
5019 FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl()));
5020 }
5021 }
5022 }
5023
5024 // Keep track of the direct virtual bases.
5025 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases;
5026 for (auto &I : ClassDecl->bases()) {
5027 if (I.isVirtual())
5028 DirectVBases.insert(&I);
5029 }
5030
5031 // Push virtual bases before others.
5032 for (auto &VBase : ClassDecl->vbases()) {
5033 if (CXXCtorInitializer *Value
5034 = Info.AllBaseFields.lookup(VBase.getType()->getAs<RecordType>())) {
5035 // [class.base.init]p7, per DR257:
5036 // A mem-initializer where the mem-initializer-id names a virtual base
5037 // class is ignored during execution of a constructor of any class that
5038 // is not the most derived class.
5039 if (ClassDecl->isAbstract()) {
5040 // FIXME: Provide a fixit to remove the base specifier. This requires
5041 // tracking the location of the associated comma for a base specifier.
5042 Diag(Value->getSourceLocation(), diag::warn_abstract_vbase_init_ignored)
5043 << VBase.getType() << ClassDecl;
5044 DiagnoseAbstractType(ClassDecl);
5045 }
5046
5047 Info.AllToInit.push_back(Value);
5048 } else if (!AnyErrors && !ClassDecl->isAbstract()) {
5049 // [class.base.init]p8, per DR257:
5050 // If a given [...] base class is not named by a mem-initializer-id
5051 // [...] and the entity is not a virtual base class of an abstract
5052 // class, then [...] the entity is default-initialized.
5053 bool IsInheritedVirtualBase = !DirectVBases.count(&VBase);
5054 CXXCtorInitializer *CXXBaseInit;
5055 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
5056 &VBase, IsInheritedVirtualBase,
5057 CXXBaseInit)) {
5058 HadError = true;
5059 continue;
5060 }
5061
5062 Info.AllToInit.push_back(CXXBaseInit);
5063 }
5064 }
5065
5066 // Non-virtual bases.
5067 for (auto &Base : ClassDecl->bases()) {
5068 // Virtuals are in the virtual base list and already constructed.
5069 if (Base.isVirtual())
5070 continue;
5071
5072 if (CXXCtorInitializer *Value
5073 = Info.AllBaseFields.lookup(Base.getType()->getAs<RecordType>())) {
5074 Info.AllToInit.push_back(Value);
5075 } else if (!AnyErrors) {
5076 CXXCtorInitializer *CXXBaseInit;
5077 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
5078 &Base, /*IsInheritedVirtualBase=*/false,
5079 CXXBaseInit)) {
5080 HadError = true;
5081 continue;
5082 }
5083
5084 Info.AllToInit.push_back(CXXBaseInit);
5085 }
5086 }
5087
5088 // Fields.
5089 for (auto *Mem : ClassDecl->decls()) {
5090 if (auto *F = dyn_cast<FieldDecl>(Mem)) {
5091 // C++ [class.bit]p2:
5092 // A declaration for a bit-field that omits the identifier declares an
5093 // unnamed bit-field. Unnamed bit-fields are not members and cannot be
5094 // initialized.
5095 if (F->isUnnamedBitfield())
5096 continue;
5097
5098 // If we're not generating the implicit copy/move constructor, then we'll
5099 // handle anonymous struct/union fields based on their individual
5100 // indirect fields.
5101 if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove())
5102 continue;
5103
5104 if (CollectFieldInitializer(*this, Info, F))
5105 HadError = true;
5106 continue;
5107 }
5108
5109 // Beyond this point, we only consider default initialization.
5110 if (Info.isImplicitCopyOrMove())
5111 continue;
5112
5113 if (auto *F = dyn_cast<IndirectFieldDecl>(Mem)) {
5114 if (F->getType()->isIncompleteArrayType()) {
5115 assert(ClassDecl->hasFlexibleArrayMember() &&
5116 "Incomplete array type is not valid");
5117 continue;
5118 }
5119
5120 // Initialize each field of an anonymous struct individually.
5121 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F))
5122 HadError = true;
5123
5124 continue;
5125 }
5126 }
5127
5128 unsigned NumInitializers = Info.AllToInit.size();
5129 if (NumInitializers > 0) {
5130 Constructor->setNumCtorInitializers(NumInitializers);
5131 CXXCtorInitializer **baseOrMemberInitializers =
5132 new (Context) CXXCtorInitializer*[NumInitializers];
5133 memcpy(baseOrMemberInitializers, Info.AllToInit.data(),
5134 NumInitializers * sizeof(CXXCtorInitializer*));
5135 Constructor->setCtorInitializers(baseOrMemberInitializers);
5136
5137 // Constructors implicitly reference the base and member
5138 // destructors.
5139 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(),
5140 Constructor->getParent());
5141 }
5142
5143 return HadError;
5144 }
5145
5146 static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) {
5147 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) {
5148 const RecordDecl *RD = RT->getDecl();
5149 if (RD->isAnonymousStructOrUnion()) {
5150 for (auto *Field : RD->fields())
5151 PopulateKeysForFields(Field, IdealInits);
5152 return;
5153 }
5154 }
5155 IdealInits.push_back(Field->getCanonicalDecl());
5156 }
5157
5158 static const void *GetKeyForBase(ASTContext &Context, QualType BaseType) {
5159 return Context.getCanonicalType(BaseType).getTypePtr();
5160 }
5161
5162 static const void *GetKeyForMember(ASTContext &Context,
5163 CXXCtorInitializer *Member) {
5164 if (!Member->isAnyMemberInitializer())
5165 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0));
5166
5167 return Member->getAnyMember()->getCanonicalDecl();
5168 }
5169
5170 static void DiagnoseBaseOrMemInitializerOrder(
5171 Sema &SemaRef, const CXXConstructorDecl *Constructor,
5172 ArrayRef<CXXCtorInitializer *> Inits) {
5173 if (Constructor->getDeclContext()->isDependentContext())
5174 return;
5175
5176 // Don't check initializers order unless the warning is enabled at the
5177 // location of at least one initializer.
5178 bool ShouldCheckOrder = false;
5179 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) {
5180 CXXCtorInitializer *Init = Inits[InitIndex];
5181 if (!SemaRef.Diags.isIgnored(diag::warn_initializer_out_of_order,
5182 Init->getSourceLocation())) {
5183 ShouldCheckOrder = true;
5184 break;
5185 }
5186 }
5187 if (!ShouldCheckOrder)
5188 return;
5189
5190 // Build the list of bases and members in the order that they'll
5191 // actually be initialized. The explicit initializers should be in
5192 // this same order but may be missing things.
5193 SmallVector<const void*, 32> IdealInitKeys;
5194
5195 const CXXRecordDecl *ClassDecl = Constructor->getParent();
5196
5197 // 1. Virtual bases.
5198 for (const auto &VBase : ClassDecl->vbases())
5199 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase.getType()));
5200
5201 // 2. Non-virtual bases.
5202 for (const auto &Base : ClassDecl->bases()) {
5203 if (Base.isVirtual())
5204 continue;
5205 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base.getType()));
5206 }
5207
5208 // 3. Direct fields.
5209 for (auto *Field : ClassDecl->fields()) {
5210 if (Field->isUnnamedBitfield())
5211 continue;
5212
5213 PopulateKeysForFields(Field, IdealInitKeys);
5214 }
5215
5216 unsigned NumIdealInits = IdealInitKeys.size();
5217 unsigned IdealIndex = 0;
5218
5219 CXXCtorInitializer *PrevInit = nullptr;
5220 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) {
5221 CXXCtorInitializer *Init = Inits[InitIndex];
5222 const void *InitKey = GetKeyForMember(SemaRef.Context, Init);
5223
5224 // Scan forward to try to find this initializer in the idealized
5225 // initializers list.
5226 for (; IdealIndex != NumIdealInits; ++IdealIndex)
5227 if (InitKey == IdealInitKeys[IdealIndex])
5228 break;
5229
5230 // If we didn't find this initializer, it must be because we
5231 // scanned past it on a previous iteration. That can only
5232 // happen if we're out of order; emit a warning.
5233 if (IdealIndex == NumIdealInits && PrevInit) {
5234 Sema::SemaDiagnosticBuilder D =
5235 SemaRef.Diag(PrevInit->getSourceLocation(),
5236 diag::warn_initializer_out_of_order);
5237
5238 if (PrevInit->isAnyMemberInitializer())
5239 D << 0 << PrevInit->getAnyMember()->getDeclName();
5240 else
5241 D << 1 << PrevInit->getTypeSourceInfo()->getType();
5242
5243 if (Init->isAnyMemberInitializer())
5244 D << 0 << Init->getAnyMember()->getDeclName();
5245 else
5246 D << 1 << Init->getTypeSourceInfo()->getType();
5247
5248 // Move back to the initializer's location in the ideal list.
5249 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex)
5250 if (InitKey == IdealInitKeys[IdealIndex])
5251 break;
5252
5253 assert(IdealIndex < NumIdealInits &&
5254 "initializer not found in initializer list");
5255 }
5256
5257 PrevInit = Init;
5258 }
5259 }
5260
5261 namespace {
5262 bool CheckRedundantInit(Sema &S,
5263 CXXCtorInitializer *Init,
5264 CXXCtorInitializer *&PrevInit) {
5265 if (!PrevInit) {
5266 PrevInit = Init;
5267 return false;
5268 }
5269
5270 if (FieldDecl *Field = Init->getAnyMember())
5271 S.Diag(Init->getSourceLocation(),
5272 diag::err_multiple_mem_initialization)
5273 << Field->getDeclName()
5274 << Init->getSourceRange();
5275 else {
5276 const Type *BaseClass = Init->getBaseClass();
5277 assert(BaseClass && "neither field nor base");
5278 S.Diag(Init->getSourceLocation(),
5279 diag::err_multiple_base_initialization)
5280 << QualType(BaseClass, 0)
5281 << Init->getSourceRange();
5282 }
5283 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer)
5284 << 0 << PrevInit->getSourceRange();
5285
5286 return true;
5287 }
5288
5289 typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry;
5290 typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap;
5291
5292 bool CheckRedundantUnionInit(Sema &S,
5293 CXXCtorInitializer *Init,
5294 RedundantUnionMap &Unions) {
5295 FieldDecl *Field = Init->getAnyMember();
5296 RecordDecl *Parent = Field->getParent();
5297 NamedDecl *Child = Field;
5298
5299 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) {
5300 if (Parent->isUnion()) {
5301 UnionEntry &En = Unions[Parent];
5302 if (En.first && En.first != Child) {
5303 S.Diag(Init->getSourceLocation(),
5304 diag::err_multiple_mem_union_initialization)
5305 << Field->getDeclName()
5306 << Init->getSourceRange();
5307 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer)
5308 << 0 << En.second->getSourceRange();
5309 return true;
5310 }
5311 if (!En.first) {
5312 En.first = Child;
5313 En.second = Init;
5314 }
5315 if (!Parent->isAnonymousStructOrUnion())
5316 return false;
5317 }
5318
5319 Child = Parent;
5320 Parent = cast<RecordDecl>(Parent->getDeclContext());
5321 }
5322
5323 return false;
5324 }
5325 }
5326
5327 /// ActOnMemInitializers - Handle the member initializers for a constructor.
5328 void Sema::ActOnMemInitializers(Decl *ConstructorDecl,
5329 SourceLocation ColonLoc,
5330 ArrayRef<CXXCtorInitializer*> MemInits,
5331 bool AnyErrors) {
5332 if (!ConstructorDecl)
5333 return;
5334
5335 AdjustDeclIfTemplate(ConstructorDecl);
5336
5337 CXXConstructorDecl *Constructor
5338 = dyn_cast<CXXConstructorDecl>(ConstructorDecl);
5339
5340 if (!Constructor) {
5341 Diag(ColonLoc, diag::err_only_constructors_take_base_inits);
5342 return;
5343 }
5344
5345 // Mapping for the duplicate initializers check.
5346 // For member initializers, this is keyed with a FieldDecl*.
5347 // For base initializers, this is keyed with a Type*.
5348 llvm::DenseMap<const void *, CXXCtorInitializer *> Members;
5349
5350 // Mapping for the inconsistent anonymous-union initializers check.
5351 RedundantUnionMap MemberUnions;
5352
5353 bool HadError = false;
5354 for (unsigned i = 0; i < MemInits.size(); i++) {
5355 CXXCtorInitializer *Init = MemInits[i];
5356
5357 // Set the source order index.
5358 Init->setSourceOrder(i);
5359
5360 if (Init->isAnyMemberInitializer()) {
5361 const void *Key = GetKeyForMember(Context, Init);
5362 if (CheckRedundantInit(*this, Init, Members[Key]) ||
5363 CheckRedundantUnionInit(*this, Init, MemberUnions))
5364 HadError = true;
5365 } else if (Init->isBaseInitializer()) {
5366 const void *Key = GetKeyForMember(Context, Init);
5367 if (CheckRedundantInit(*this, Init, Members[Key]))
5368 HadError = true;
5369 } else {
5370 assert(Init->isDelegatingInitializer());
5371 // This must be the only initializer
5372 if (MemInits.size() != 1) {
5373 Diag(Init->getSourceLocation(),
5374 diag::err_delegating_initializer_alone)
5375 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange();
5376 // We will treat this as being the only initializer.
5377 }
5378 SetDelegatingInitializer(Constructor, MemInits[i]);
5379 // Return immediately as the initializer is set.
5380 return;
5381 }
5382 }
5383
5384 if (HadError)
5385 return;
5386
5387 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits);
5388
5389 SetCtorInitializers(Constructor, AnyErrors, MemInits);
5390
5391 DiagnoseUninitializedFields(*this, Constructor);
5392 }
5393
5394 void
5395 Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location,
5396 CXXRecordDecl *ClassDecl) {
5397 // Ignore dependent contexts. Also ignore unions, since their members never
5398 // have destructors implicitly called.
5399 if (ClassDecl->isDependentContext() || ClassDecl->isUnion())
5400 return;
5401
5402 // FIXME: all the access-control diagnostics are positioned on the
5403 // field/base declaration. That's probably good; that said, the
5404 // user might reasonably want to know why the destructor is being
5405 // emitted, and we currently don't say.
5406
5407 // Non-static data members.
5408 for (auto *Field : ClassDecl->fields()) {
5409 if (Field->isInvalidDecl())
5410 continue;
5411
5412 // Don't destroy incomplete or zero-length arrays.
5413 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType()))
5414 continue;
5415
5416 QualType FieldType = Context.getBaseElementType(Field->getType());
5417
5418 const RecordType* RT = FieldType->getAs<RecordType>();
5419 if (!RT)
5420 continue;
5421
5422 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
5423 if (FieldClassDecl->isInvalidDecl())
5424 continue;
5425 if (FieldClassDecl->hasIrrelevantDestructor())
5426 continue;
5427 // The destructor for an implicit anonymous union member is never invoked.
5428 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion())
5429 continue;
5430
5431 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl);
5432 assert(Dtor && "No dtor found for FieldClassDecl!");
5433 CheckDestructorAccess(Field->getLocation(), Dtor,
5434 PDiag(diag::err_access_dtor_field)
5435 << Field->getDeclName()
5436 << FieldType);
5437
5438 MarkFunctionReferenced(Location, Dtor);
5439 DiagnoseUseOfDecl(Dtor, Location);
5440 }
5441
5442 // We only potentially invoke the destructors of potentially constructed
5443 // subobjects.
5444 bool VisitVirtualBases = !ClassDecl->isAbstract();
5445
5446 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases;
5447
5448 // Bases.
5449 for (const auto &Base : ClassDecl->bases()) {
5450 // Bases are always records in a well-formed non-dependent class.
5451 const RecordType *RT = Base.getType()->getAs<RecordType>();
5452
5453 // Remember direct virtual bases.
5454 if (Base.isVirtual()) {
5455 if (!VisitVirtualBases)
5456 continue;
5457 DirectVirtualBases.insert(RT);
5458 }
5459
5460 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
5461 // If our base class is invalid, we probably can't get its dtor anyway.
5462 if (BaseClassDecl->isInvalidDecl())
5463 continue;
5464 if (BaseClassDecl->hasIrrelevantDestructor())
5465 continue;
5466
5467 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
5468 assert(Dtor && "No dtor found for BaseClassDecl!");
5469
5470 // FIXME: caret should be on the start of the class name
5471 CheckDestructorAccess(Base.getBeginLoc(), Dtor,
5472 PDiag(diag::err_access_dtor_base)
5473 << Base.getType() << Base.getSourceRange(),
5474 Context.getTypeDeclType(ClassDecl));
5475
5476 MarkFunctionReferenced(Location, Dtor);
5477 DiagnoseUseOfDecl(Dtor, Location);
5478 }
5479
5480 if (!VisitVirtualBases)
5481 return;
5482
5483 // Virtual bases.
5484 for (const auto &VBase : ClassDecl->vbases()) {
5485 // Bases are always records in a well-formed non-dependent class.
5486 const RecordType *RT = VBase.getType()->castAs<RecordType>();
5487
5488 // Ignore direct virtual bases.
5489 if (DirectVirtualBases.count(RT))
5490 continue;
5491
5492 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
5493 // If our base class is invalid, we probably can't get its dtor anyway.
5494 if (BaseClassDecl->isInvalidDecl())
5495 continue;
5496 if (BaseClassDecl->hasIrrelevantDestructor())
5497 continue;
5498
5499 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
5500 assert(Dtor && "No dtor found for BaseClassDecl!");
5501 if (CheckDestructorAccess(
5502 ClassDecl->getLocation(), Dtor,
5503 PDiag(diag::err_access_dtor_vbase)
5504 << Context.getTypeDeclType(ClassDecl) << VBase.getType(),
5505 Context.getTypeDeclType(ClassDecl)) ==
5506 AR_accessible) {
5507 CheckDerivedToBaseConversion(
5508 Context.getTypeDeclType(ClassDecl), VBase.getType(),
5509 diag::err_access_dtor_vbase, 0, ClassDecl->getLocation(),
5510 SourceRange(), DeclarationName(), nullptr);
5511 }
5512
5513 MarkFunctionReferenced(Location, Dtor);
5514 DiagnoseUseOfDecl(Dtor, Location);
5515 }
5516 }
5517
5518 void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) {
5519 if (!CDtorDecl)
5520 return;
5521
5522 if (CXXConstructorDecl *Constructor
5523 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) {
5524 SetCtorInitializers(Constructor, /*AnyErrors=*/false);
5525 DiagnoseUninitializedFields(*this, Constructor);
5526 }
5527 }
5528
5529 bool Sema::isAbstractType(SourceLocation Loc, QualType T) {
5530 if (!getLangOpts().CPlusPlus)
5531 return false;
5532
5533 const auto *RD = Context.getBaseElementType(T)->getAsCXXRecordDecl();
5534 if (!RD)
5535 return false;
5536
5537 // FIXME: Per [temp.inst]p1, we are supposed to trigger instantiation of a
5538 // class template specialization here, but doing so breaks a lot of code.
5539
5540 // We can't answer whether something is abstract until it has a
5541 // definition. If it's currently being defined, we'll walk back
5542 // over all the declarations when we have a full definition.
5543 const CXXRecordDecl *Def = RD->getDefinition();
5544 if (!Def || Def->isBeingDefined())
5545 return false;
5546
5547 return RD->isAbstract();
5548 }
5549
5550 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
5551 TypeDiagnoser &Diagnoser) {
5552 if (!isAbstractType(Loc, T))
5553 return false;
5554
5555 T = Context.getBaseElementType(T);
5556 Diagnoser.diagnose(*this, Loc, T);
5557 DiagnoseAbstractType(T->getAsCXXRecordDecl());
5558 return true;
5559 }
5560
5561 void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) {
5562 // Check if we've already emitted the list of pure virtual functions
5563 // for this class.
5564 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD))
5565 return;
5566
5567 // If the diagnostic is suppressed, don't emit the notes. We're only
5568 // going to emit them once, so try to attach them to a diagnostic we're
5569 // actually going to show.
5570 if (Diags.isLastDiagnosticIgnored())
5571 return;
5572
5573 CXXFinalOverriderMap FinalOverriders;
5574 RD->getFinalOverriders(FinalOverriders);
5575
5576 // Keep a set of seen pure methods so we won't diagnose the same method
5577 // more than once.
5578 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods;
5579
5580 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(),
5581 MEnd = FinalOverriders.end();
5582 M != MEnd;
5583 ++M) {
5584 for (OverridingMethods::iterator SO = M->second.begin(),
5585 SOEnd = M->second.end();
5586 SO != SOEnd; ++SO) {
5587 // C++ [class.abstract]p4:
5588 // A class is abstract if it contains or inherits at least one
5589 // pure virtual function for which the final overrider is pure
5590 // virtual.
5591
5592 //
5593 if (SO->second.size() != 1)
5594 continue;
5595
5596 if (!SO->second.front().Method->isPure())
5597 continue;
5598
5599 if (!SeenPureMethods.insert(SO->second.front().Method).second)
5600 continue;
5601
5602 Diag(SO->second.front().Method->getLocation(),
5603 diag::note_pure_virtual_function)
5604 << SO->second.front().Method->getDeclName() << RD->getDeclName();
5605 }
5606 }
5607
5608 if (!PureVirtualClassDiagSet)
5609 PureVirtualClassDiagSet.reset(new RecordDeclSetTy);
5610 PureVirtualClassDiagSet->insert(RD);
5611 }
5612
5613 namespace {
5614 struct AbstractUsageInfo {
5615 Sema &S;
5616 CXXRecordDecl *Record;
5617 CanQualType AbstractType;
5618 bool Invalid;
5619
5620 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record)
5621 : S(S), Record(Record),
5622 AbstractType(S.Context.getCanonicalType(
5623 S.Context.getTypeDeclType(Record))),
5624 Invalid(false) {}
5625
5626 void DiagnoseAbstractType() {
5627 if (Invalid) return;
5628 S.DiagnoseAbstractType(Record);
5629 Invalid = true;
5630 }
5631
5632 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel);
5633 };
5634
5635 struct CheckAbstractUsage {
5636 AbstractUsageInfo &Info;
5637 const NamedDecl *Ctx;
5638
5639 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx)
5640 : Info(Info), Ctx(Ctx) {}
5641
5642 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
5643 switch (TL.getTypeLocClass()) {
5644 #define ABSTRACT_TYPELOC(CLASS, PARENT)
5645 #define TYPELOC(CLASS, PARENT) \
5646 case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break;
5647 #include "clang/AST/TypeLocNodes.def"
5648 }
5649 }
5650
5651 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) {
5652 Visit(TL.getReturnLoc(), Sema::AbstractReturnType);
5653 for (unsigned I = 0, E = TL.getNumParams(); I != E; ++I) {
5654 if (!TL.getParam(I))
5655 continue;
5656
5657 TypeSourceInfo *TSI = TL.getParam(I)->getTypeSourceInfo();
5658 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType);
5659 }
5660 }
5661
5662 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) {
5663 Visit(TL.getElementLoc(), Sema::AbstractArrayType);
5664 }
5665
5666 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) {
5667 // Visit the type parameters from a permissive context.
5668 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) {
5669 TemplateArgumentLoc TAL = TL.getArgLoc(I);
5670 if (TAL.getArgument().getKind() == TemplateArgument::Type)
5671 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo())
5672 Visit(TSI->getTypeLoc(), Sema::AbstractNone);
5673 // TODO: other template argument types?
5674 }
5675 }
5676
5677 // Visit pointee types from a permissive context.
5678 #define CheckPolymorphic(Type) \
5679 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \
5680 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \
5681 }
5682 CheckPolymorphic(PointerTypeLoc)
5683 CheckPolymorphic(ReferenceTypeLoc)
5684 CheckPolymorphic(MemberPointerTypeLoc)
5685 CheckPolymorphic(BlockPointerTypeLoc)
5686 CheckPolymorphic(AtomicTypeLoc)
5687
5688 /// Handle all the types we haven't given a more specific
5689 /// implementation for above.
5690 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
5691 // Every other kind of type that we haven't called out already
5692 // that has an inner type is either (1) sugar or (2) contains that
5693 // inner type in some way as a subobject.
5694 if (TypeLoc Next = TL.getNextTypeLoc())
5695 return Visit(Next, Sel);
5696
5697 // If there's no inner type and we're in a permissive context,
5698 // don't diagnose.
5699 if (Sel == Sema::AbstractNone) return;
5700
5701 // Check whether the type matches the abstract type.
5702 QualType T = TL.getType();
5703 if (T->isArrayType()) {
5704 Sel = Sema::AbstractArrayType;
5705 T = Info.S.Context.getBaseElementType(T);
5706 }
5707 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType();
5708 if (CT != Info.AbstractType) return;
5709
5710 // It matched; do some magic.
5711 if (Sel == Sema::AbstractArrayType) {
5712 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type)
5713 << T << TL.getSourceRange();
5714 } else {
5715 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl)
5716 << Sel << T << TL.getSourceRange();
5717 }
5718 Info.DiagnoseAbstractType();
5719 }
5720 };
5721
5722 void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL,
5723 Sema::AbstractDiagSelID Sel) {
5724 CheckAbstractUsage(*this, D).Visit(TL, Sel);
5725 }
5726
5727 }
5728
5729 /// Check for invalid uses of an abstract type in a method declaration.
5730 static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
5731 CXXMethodDecl *MD) {
5732 // No need to do the check on definitions, which require that
5733 // the return/param types be complete.
5734 if (MD->doesThisDeclarationHaveABody())
5735 return;
5736
5737 // For safety's sake, just ignore it if we don't have type source
5738 // information. This should never happen for non-implicit methods,
5739 // but...
5740 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
5741 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone);
5742 }
5743
5744 /// Check for invalid uses of an abstract type within a class definition.
5745 static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
5746 CXXRecordDecl *RD) {
5747 for (auto *D : RD->decls()) {
5748 if (D->isImplicit()) continue;
5749
5750 // Methods and method templates.
5751 if (isa<CXXMethodDecl>(D)) {
5752 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D));
5753 } else if (isa<FunctionTemplateDecl>(D)) {
5754 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl();
5755 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD));
5756
5757 // Fields and static variables.
5758 } else if (isa<FieldDecl>(D)) {
5759 FieldDecl *FD = cast<FieldDecl>(D);
5760 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo())
5761 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType);
5762 } else if (isa<VarDecl>(D)) {
5763 VarDecl *VD = cast<VarDecl>(D);
5764 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo())
5765 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType);
5766
5767 // Nested classes and class templates.
5768 } else if (isa<CXXRecordDecl>(D)) {
5769 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D));
5770 } else if (isa<ClassTemplateDecl>(D)) {
5771 CheckAbstractClassUsage(Info,
5772 cast<ClassTemplateDecl>(D)->getTemplatedDecl());
5773 }
5774 }
5775 }
5776
5777 static void ReferenceDllExportedMembers(Sema &S, CXXRecordDecl *Class) {
5778 Attr *ClassAttr = getDLLAttr(Class);
5779 if (!ClassAttr)
5780 return;
5781
5782 assert(ClassAttr->getKind() == attr::DLLExport);
5783
5784 TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind();
5785
5786 if (TSK == TSK_ExplicitInstantiationDeclaration)
5787 // Don't go any further if this is just an explicit instantiation
5788 // declaration.
5789 return;
5790
5791 if (S.Context.getTargetInfo().getTriple().isWindowsGNUEnvironment())
5792 S.MarkVTableUsed(Class->getLocation(), Class, true);
5793
5794 for (Decl *Member : Class->decls()) {
5795 // Defined static variables that are members of an exported base
5796 // class must be marked export too.
5797 auto *VD = dyn_cast<VarDecl>(Member);
5798 if (VD && Member->getAttr<DLLExportAttr>() &&
5799 VD->getStorageClass() == SC_Static &&
5800 TSK == TSK_ImplicitInstantiation)
5801 S.MarkVariableReferenced(VD->getLocation(), VD);
5802
5803 auto *MD = dyn_cast<CXXMethodDecl>(Member);
5804 if (!MD)
5805 continue;
5806
5807 if (Member->getAttr<DLLExportAttr>()) {
5808 if (MD->isUserProvided()) {
5809 // Instantiate non-default class member functions ...
5810
5811 // .. except for certain kinds of template specializations.
5812 if (TSK == TSK_ImplicitInstantiation && !ClassAttr->isInherited())
5813 continue;
5814
5815 S.MarkFunctionReferenced(Class->getLocation(), MD);
5816
5817 // The function will be passed to the consumer when its definition is
5818 // encountered.
5819 } else if (!MD->isTrivial() || MD->isExplicitlyDefaulted() ||
5820 MD->isCopyAssignmentOperator() ||
5821 MD->isMoveAssignmentOperator()) {
5822 // Synthesize and instantiate non-trivial implicit methods, explicitly
5823 // defaulted methods, and the copy and move assignment operators. The
5824 // latter are exported even if they are trivial, because the address of
5825 // an operator can be taken and should compare equal across libraries.
5826 DiagnosticErrorTrap Trap(S.Diags);
5827 S.MarkFunctionReferenced(Class->getLocation(), MD);
5828 if (Trap.hasErrorOccurred()) {
5829 S.Diag(ClassAttr->getLocation(), diag::note_due_to_dllexported_class)
5830 << Class << !S.getLangOpts().CPlusPlus11;
5831 break;
5832 }
5833
5834 // There is no later point when we will see the definition of this
5835 // function, so pass it to the consumer now.
5836 S.Consumer.HandleTopLevelDecl(DeclGroupRef(MD));
5837 }
5838 }
5839 }
5840 }
5841
5842 static void checkForMultipleExportedDefaultConstructors(Sema &S,
5843 CXXRecordDecl *Class) {
5844 // Only the MS ABI has default constructor closures, so we don't need to do
5845 // this semantic checking anywhere else.
5846 if (!S.Context.getTargetInfo().getCXXABI().isMicrosoft())
5847 return;
5848
5849 CXXConstructorDecl *LastExportedDefaultCtor = nullptr;
5850 for (Decl *Member : Class->decls()) {
5851 // Look for exported default constructors.
5852 auto *CD = dyn_cast<CXXConstructorDecl>(Member);
5853 if (!CD || !CD->isDefaultConstructor())
5854 continue;
5855 auto *Attr = CD->getAttr<DLLExportAttr>();
5856 if (!Attr)
5857 continue;
5858
5859 // If the class is non-dependent, mark the default arguments as ODR-used so
5860 // that we can properly codegen the constructor closure.
5861 if (!Class->isDependentContext()) {
5862 for (ParmVarDecl *PD : CD->parameters()) {
5863 (void)S.CheckCXXDefaultArgExpr(Attr->getLocation(), CD, PD);
5864 S.DiscardCleanupsInEvaluationContext();
5865 }
5866 }
5867
5868 if (LastExportedDefaultCtor) {
5869 S.Diag(LastExportedDefaultCtor->getLocation(),
5870 diag::err_attribute_dll_ambiguous_default_ctor)
5871 << Class;
5872 S.Diag(CD->getLocation(), diag::note_entity_declared_at)
5873 << CD->getDeclName();
5874 return;
5875 }
5876 LastExportedDefaultCtor = CD;
5877 }
5878 }
5879
5880 void Sema::checkClassLevelCodeSegAttribute(CXXRecordDecl *Class) {
5881 // Mark any compiler-generated routines with the implicit code_seg attribute.
5882 for (auto *Method : Class->methods()) {
5883 if (Method->isUserProvided())
5884 continue;
5885 if (Attr *A = getImplicitCodeSegOrSectionAttrForFunction(Method, /*IsDefinition=*/true))
5886 Method->addAttr(A);
5887 }
5888 }
5889
5890 /// Check class-level dllimport/dllexport attribute.
5891 void Sema::checkClassLevelDLLAttribute(CXXRecordDecl *Class) {
5892 Attr *ClassAttr = getDLLAttr(Class);
5893
5894 // MSVC inherits DLL attributes to partial class template specializations.
5895 if (Context.getTargetInfo().getCXXABI().isMicrosoft() && !ClassAttr) {
5896 if (auto *Spec = dyn_cast<ClassTemplatePartialSpecializationDecl>(Class)) {
5897 if (Attr *TemplateAttr =
5898 getDLLAttr(Spec->getSpecializedTemplate()->getTemplatedDecl())) {
5899 auto *A = cast<InheritableAttr>(TemplateAttr->clone(getASTContext()));
5900 A->setInherited(true);
5901 ClassAttr = A;
5902 }
5903 }
5904 }
5905
5906 if (!ClassAttr)
5907 return;
5908
5909 if (!Class->isExternallyVisible()) {
5910 Diag(Class->getLocation(), diag::err_attribute_dll_not_extern)
5911 << Class << ClassAttr;
5912 return;
5913 }
5914
5915 if (Context.getTargetInfo().getCXXABI().isMicrosoft() &&
5916 !ClassAttr->isInherited()) {
5917 // Diagnose dll attributes on members of class with dll attribute.
5918 for (Decl *Member : Class->decls()) {
5919 if (!isa<VarDecl>(Member) && !isa<CXXMethodDecl>(Member))
5920 continue;
5921 InheritableAttr *MemberAttr = getDLLAttr(Member);
5922 if (!MemberAttr || MemberAttr->isInherited() || Member->isInvalidDecl())
5923 continue;
5924
5925 Diag(MemberAttr->getLocation(),
5926 diag::err_attribute_dll_member_of_dll_class)
5927 << MemberAttr << ClassAttr;
5928 Diag(ClassAttr->getLocation(), diag::note_previous_attribute);
5929 Member->setInvalidDecl();
5930 }
5931 }
5932
5933 if (Class->getDescribedClassTemplate())
5934 // Don't inherit dll attribute until the template is instantiated.
5935 return;
5936
5937 // The class is either imported or exported.
5938 const bool ClassExported = ClassAttr->getKind() == attr::DLLExport;
5939
5940 // Check if this was a dllimport attribute propagated from a derived class to
5941 // a base class template specialization. We don't apply these attributes to
5942 // static data members.
5943 const bool PropagatedImport =
5944 !ClassExported &&
5945 cast<DLLImportAttr>(ClassAttr)->wasPropagatedToBaseTemplate();
5946
5947 TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind();
5948
5949 // Ignore explicit dllexport on explicit class template instantiation
5950 // declarations, except in MinGW mode.
5951 if (ClassExported && !ClassAttr->isInherited() &&
5952 TSK == TSK_ExplicitInstantiationDeclaration &&
5953 !Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) {
5954 Class->dropAttr<DLLExportAttr>();
5955 return;
5956 }
5957
5958 // Force declaration of implicit members so they can inherit the attribute.
5959 ForceDeclarationOfImplicitMembers(Class);
5960
5961 // FIXME: MSVC's docs say all bases must be exportable, but this doesn't
5962 // seem to be true in practice?
5963
5964 for (Decl *Member : Class->decls()) {
5965 VarDecl *VD = dyn_cast<VarDecl>(Member);
5966 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member);
5967
5968 // Only methods and static fields inherit the attributes.
5969 if (!VD && !MD)
5970 continue;
5971
5972 if (MD) {
5973 // Don't process deleted methods.
5974 if (MD->isDeleted())
5975 continue;
5976
5977 if (MD->isInlined()) {
5978 // MinGW does not import or export inline methods. But do it for
5979 // template instantiations.
5980 if (!Context.getTargetInfo().getCXXABI().isMicrosoft() &&
5981 !Context.getTargetInfo().getTriple().isWindowsItaniumEnvironment() &&
5982 TSK != TSK_ExplicitInstantiationDeclaration &&
5983 TSK != TSK_ExplicitInstantiationDefinition)
5984 continue;
5985
5986 // MSVC versions before 2015 don't export the move assignment operators
5987 // and move constructor, so don't attempt to import/export them if
5988 // we have a definition.
5989 auto *Ctor = dyn_cast<CXXConstructorDecl>(MD);
5990 if ((MD->isMoveAssignmentOperator() ||
5991 (Ctor && Ctor->isMoveConstructor())) &&
5992 !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015))
5993 continue;
5994
5995 // MSVC2015 doesn't export trivial defaulted x-tor but copy assign
5996 // operator is exported anyway.
5997 if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) &&
5998 (Ctor || isa<CXXDestructorDecl>(MD)) && MD->isTrivial())
5999 continue;
6000 }
6001 }
6002
6003 // Don't apply dllimport attributes to static data members of class template
6004 // instantiations when the attribute is propagated from a derived class.
6005 if (VD && PropagatedImport)
6006 continue;
6007
6008 if (!cast<NamedDecl>(Member)->isExternallyVisible())
6009 continue;
6010
6011 if (!getDLLAttr(Member)) {
6012 InheritableAttr *NewAttr = nullptr;
6013
6014 // Do not export/import inline function when -fno-dllexport-inlines is
6015 // passed. But add attribute for later local static var check.
6016 if (!getLangOpts().DllExportInlines && MD && MD->isInlined() &&
6017 TSK != TSK_ExplicitInstantiationDeclaration &&
6018 TSK != TSK_ExplicitInstantiationDefinition) {
6019 if (ClassExported) {
6020 NewAttr = ::new (getASTContext())
6021 DLLExportStaticLocalAttr(getASTContext(), *ClassAttr);
6022 } else {
6023 NewAttr = ::new (getASTContext())
6024 DLLImportStaticLocalAttr(getASTContext(), *ClassAttr);
6025 }
6026 } else {
6027 NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext()));
6028 }
6029
6030 NewAttr->setInherited(true);
6031 Member->addAttr(NewAttr);
6032
6033 if (MD) {
6034 // Propagate DLLAttr to friend re-declarations of MD that have already
6035 // been constructed.
6036 for (FunctionDecl *FD = MD->getMostRecentDecl(); FD;
6037 FD = FD->getPreviousDecl()) {
6038 if (FD->getFriendObjectKind() == Decl::FOK_None)
6039 continue;
6040 assert(!getDLLAttr(FD) &&
6041 "friend re-decl should not already have a DLLAttr");
6042 NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext()));
6043 NewAttr->setInherited(true);
6044 FD->addAttr(NewAttr);
6045 }
6046 }
6047 }
6048 }
6049
6050 if (ClassExported)
6051 DelayedDllExportClasses.push_back(Class);
6052 }
6053
6054 /// Perform propagation of DLL attributes from a derived class to a
6055 /// templated base class for MS compatibility.
6056 void Sema::propagateDLLAttrToBaseClassTemplate(
6057 CXXRecordDecl *Class, Attr *ClassAttr,
6058 ClassTemplateSpecializationDecl *BaseTemplateSpec, SourceLocation BaseLoc) {
6059 if (getDLLAttr(
6060 BaseTemplateSpec->getSpecializedTemplate()->getTemplatedDecl())) {
6061 // If the base class template has a DLL attribute, don't try to change it.
6062 return;
6063 }
6064
6065 auto TSK = BaseTemplateSpec->getSpecializationKind();
6066 if (!getDLLAttr(BaseTemplateSpec) &&
6067 (TSK == TSK_Undeclared || TSK == TSK_ExplicitInstantiationDeclaration ||
6068 TSK == TSK_ImplicitInstantiation)) {
6069 // The template hasn't been instantiated yet (or it has, but only as an
6070 // explicit instantiation declaration or implicit instantiation, which means
6071 // we haven't codegenned any members yet), so propagate the attribute.
6072 auto *NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext()));
6073 NewAttr->setInherited(true);
6074 BaseTemplateSpec->addAttr(NewAttr);
6075
6076 // If this was an import, mark that we propagated it from a derived class to
6077 // a base class template specialization.
6078 if (auto *ImportAttr = dyn_cast<DLLImportAttr>(NewAttr))
6079 ImportAttr->setPropagatedToBaseTemplate();
6080
6081 // If the template is already instantiated, checkDLLAttributeRedeclaration()
6082 // needs to be run again to work see the new attribute. Otherwise this will
6083 // get run whenever the template is instantiated.
6084 if (TSK != TSK_Undeclared)
6085 checkClassLevelDLLAttribute(BaseTemplateSpec);
6086
6087 return;
6088 }
6089
6090 if (getDLLAttr(BaseTemplateSpec)) {
6091 // The template has already been specialized or instantiated with an
6092 // attribute, explicitly or through propagation. We should not try to change
6093 // it.
6094 return;
6095 }
6096
6097 // The template was previously instantiated or explicitly specialized without
6098 // a dll attribute, It's too late for us to add an attribute, so warn that
6099 // this is unsupported.
6100 Diag(BaseLoc, diag::warn_attribute_dll_instantiated_base_class)
6101 << BaseTemplateSpec->isExplicitSpecialization();
6102 Diag(ClassAttr->getLocation(), diag::note_attribute);
6103 if (BaseTemplateSpec->isExplicitSpecialization()) {
6104 Diag(BaseTemplateSpec->getLocation(),
6105 diag::note_template_class_explicit_specialization_was_here)
6106 << BaseTemplateSpec;
6107 } else {
6108 Diag(BaseTemplateSpec->getPointOfInstantiation(),
6109 diag::note_template_class_instantiation_was_here)
6110 << BaseTemplateSpec;
6111 }
6112 }
6113
6114 /// Determine the kind of defaulting that would be done for a given function.
6115 ///
6116 /// If the function is both a default constructor and a copy / move constructor
6117 /// (due to having a default argument for the first parameter), this picks
6118 /// CXXDefaultConstructor.
6119 ///
6120 /// FIXME: Check that case is properly handled by all callers.
6121 Sema::DefaultedFunctionKind
6122 Sema::getDefaultedFunctionKind(const FunctionDecl *FD) {
6123 if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) {
6124 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(FD)) {
6125 if (Ctor->isDefaultConstructor())
6126 return Sema::CXXDefaultConstructor;
6127
6128 if (Ctor->isCopyConstructor())
6129 return Sema::CXXCopyConstructor;
6130
6131 if (Ctor->isMoveConstructor())
6132 return Sema::CXXMoveConstructor;
6133 }
6134
6135 if (MD->isCopyAssignmentOperator())
6136 return Sema::CXXCopyAssignment;
6137
6138 if (MD->isMoveAssignmentOperator())
6139 return Sema::CXXMoveAssignment;
6140
6141 if (isa<CXXDestructorDecl>(FD))
6142 return Sema::CXXDestructor;
6143 }
6144
6145 switch (FD->getDeclName().getCXXOverloadedOperator()) {
6146 case OO_EqualEqual:
6147 return DefaultedComparisonKind::Equal;
6148
6149 case OO_ExclaimEqual:
6150 return DefaultedComparisonKind::NotEqual;
6151
6152 case OO_Spaceship:
6153 // No point allowing this if <=> doesn't exist in the current language mode.
6154 if (!getLangOpts().CPlusPlus2a)
6155 break;
6156 return DefaultedComparisonKind::ThreeWay;
6157
6158 case OO_Less:
6159 case OO_LessEqual:
6160 case OO_Greater:
6161 case OO_GreaterEqual:
6162 // No point allowing this if <=> doesn't exist in the current language mode.
6163 if (!getLangOpts().CPlusPlus2a)
6164 break;
6165 return DefaultedComparisonKind::Relational;
6166
6167 default:
6168 break;
6169 }
6170
6171 // Not defaultable.
6172 return DefaultedFunctionKind();
6173 }
6174
6175 static void DefineImplicitSpecialMember(Sema &S, CXXMethodDecl *MD,
6176 SourceLocation DefaultLoc) {
6177 switch (S.getSpecialMember(MD)) {
6178 case Sema::CXXDefaultConstructor:
6179 S.DefineImplicitDefaultConstructor(DefaultLoc,
6180 cast<CXXConstructorDecl>(MD));
6181 break;
6182 case Sema::CXXCopyConstructor:
6183 S.DefineImplicitCopyConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD));
6184 break;
6185 case Sema::CXXCopyAssignment:
6186 S.DefineImplicitCopyAssignment(DefaultLoc, MD);
6187 break;
6188 case Sema::CXXDestructor:
6189 S.DefineImplicitDestructor(DefaultLoc, cast<CXXDestructorDecl>(MD));
6190 break;
6191 case Sema::CXXMoveConstructor:
6192 S.DefineImplicitMoveConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD));
6193 break;
6194 case Sema::CXXMoveAssignment:
6195 S.DefineImplicitMoveAssignment(DefaultLoc, MD);
6196 break;
6197 case Sema::CXXInvalid:
6198 llvm_unreachable("Invalid special member.");
6199 }
6200 }
6201
6202 /// Determine whether a type is permitted to be passed or returned in
6203 /// registers, per C++ [class.temporary]p3.
6204 static bool canPassInRegisters(Sema &S, CXXRecordDecl *D,
6205 TargetInfo::CallingConvKind CCK) {
6206 if (D->isDependentType() || D->isInvalidDecl())
6207 return false;
6208
6209 // Clang <= 4 used the pre-C++11 rule, which ignores move operations.
6210 // The PS4 platform ABI follows the behavior of Clang 3.2.
6211 if (CCK == TargetInfo::CCK_ClangABI4OrPS4)
6212 return !D->hasNonTrivialDestructorForCall() &&
6213 !D->hasNonTrivialCopyConstructorForCall();
6214
6215 if (CCK == TargetInfo::CCK_MicrosoftWin64) {
6216 bool CopyCtorIsTrivial = false, CopyCtorIsTrivialForCall = false;
6217 bool DtorIsTrivialForCall = false;
6218
6219 // If a class has at least one non-deleted, trivial copy constructor, it
6220 // is passed according to the C ABI. Otherwise, it is passed indirectly.
6221 //
6222 // Note: This permits classes with non-trivial copy or move ctors to be
6223 // passed in registers, so long as they *also* have a trivial copy ctor,
6224 // which is non-conforming.
6225 if (D->needsImplicitCopyConstructor()) {
6226 if (!D->defaultedCopyConstructorIsDeleted()) {
6227 if (D->hasTrivialCopyConstructor())
6228 CopyCtorIsTrivial = true;
6229 if (D->hasTrivialCopyConstructorForCall())
6230 CopyCtorIsTrivialForCall = true;
6231 }
6232 } else {
6233 for (const CXXConstructorDecl *CD : D->ctors()) {
6234 if (CD->isCopyConstructor() && !CD->isDeleted()) {
6235 if (CD->isTrivial())
6236 CopyCtorIsTrivial = true;
6237 if (CD->isTrivialForCall())
6238 CopyCtorIsTrivialForCall = true;
6239 }
6240 }
6241 }
6242
6243 if (D->needsImplicitDestructor()) {
6244 if (!D->defaultedDestructorIsDeleted() &&
6245 D->hasTrivialDestructorForCall())
6246 DtorIsTrivialForCall = true;
6247 } else if (const auto *DD = D->getDestructor()) {
6248 if (!DD->isDeleted() && DD->isTrivialForCall())
6249 DtorIsTrivialForCall = true;
6250 }
6251
6252 // If the copy ctor and dtor are both trivial-for-calls, pass direct.
6253 if (CopyCtorIsTrivialForCall && DtorIsTrivialForCall)
6254 return true;
6255
6256 // If a class has a destructor, we'd really like to pass it indirectly
6257 // because it allows us to elide copies. Unfortunately, MSVC makes that
6258 // impossible for small types, which it will pass in a single register or
6259 // stack slot. Most objects with dtors are large-ish, so handle that early.
6260 // We can't call out all large objects as being indirect because there are
6261 // multiple x64 calling conventions and the C++ ABI code shouldn't dictate
6262 // how we pass large POD types.
6263
6264 // Note: This permits small classes with nontrivial destructors to be
6265 // passed in registers, which is non-conforming.
6266 bool isAArch64 = S.Context.getTargetInfo().getTriple().isAArch64();
6267 uint64_t TypeSize = isAArch64 ? 128 : 64;
6268
6269 if (CopyCtorIsTrivial &&
6270 S.getASTContext().getTypeSize(D->getTypeForDecl()) <= TypeSize)
6271 return true;
6272 return false;
6273 }
6274
6275 // Per C++ [class.temporary]p3, the relevant condition is:
6276 // each copy constructor, move constructor, and destructor of X is
6277 // either trivial or deleted, and X has at least one non-deleted copy
6278 // or move constructor
6279 bool HasNonDeletedCopyOrMove = false;
6280
6281 if (D->needsImplicitCopyConstructor() &&
6282 !D->defaultedCopyConstructorIsDeleted()) {
6283 if (!D->hasTrivialCopyConstructorForCall())
6284 return false;
6285 HasNonDeletedCopyOrMove = true;
6286 }
6287
6288 if (S.getLangOpts().CPlusPlus11 && D->needsImplicitMoveConstructor() &&
6289 !D->defaultedMoveConstructorIsDeleted()) {
6290 if (!D->hasTrivialMoveConstructorForCall())
6291 return false;
6292 HasNonDeletedCopyOrMove = true;
6293 }
6294
6295 if (D->needsImplicitDestructor() && !D->defaultedDestructorIsDeleted() &&
6296 !D->hasTrivialDestructorForCall())
6297 return false;
6298
6299 for (const CXXMethodDecl *MD : D->methods()) {
6300 if (MD->isDeleted())
6301 continue;
6302
6303 auto *CD = dyn_cast<CXXConstructorDecl>(MD);
6304 if (CD && CD->isCopyOrMoveConstructor())
6305 HasNonDeletedCopyOrMove = true;
6306 else if (!isa<CXXDestructorDecl>(MD))
6307 continue;
6308
6309 if (!MD->isTrivialForCall())
6310 return false;
6311 }
6312
6313 return HasNonDeletedCopyOrMove;
6314 }
6315
6316 /// Perform semantic checks on a class definition that has been
6317 /// completing, introducing implicitly-declared members, checking for
6318 /// abstract types, etc.
6319 ///
6320 /// \param S The scope in which the class was parsed. Null if we didn't just
6321 /// parse a class definition.
6322 /// \param Record The completed class.
6323 void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) {
6324 if (!Record)
6325 return;
6326
6327 if (Record->isAbstract() && !Record->isInvalidDecl()) {
6328 AbstractUsageInfo Info(*this, Record);
6329 CheckAbstractClassUsage(Info, Record);
6330 }
6331
6332 // If this is not an aggregate type and has no user-declared constructor,
6333 // complain about any non-static data members of reference or const scalar
6334 // type, since they will never get initializers.
6335 if (!Record->isInvalidDecl() && !Record->isDependentType() &&
6336 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() &&
6337 !Record->isLambda()) {
6338 bool Complained = false;
6339 for (const auto *F : Record->fields()) {
6340 if (F->hasInClassInitializer() || F->isUnnamedBitfield())
6341 continue;
6342
6343 if (F->getType()->isReferenceType() ||
6344 (F->getType().isConstQualified() && F->getType()->isScalarType())) {
6345 if (!Complained) {
6346 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst)
6347 << Record->getTagKind() << Record;
6348 Complained = true;
6349 }
6350
6351 Diag(F->getLocation(), diag::note_refconst_member_not_initialized)
6352 << F->getType()->isReferenceType()
6353 << F->getDeclName();
6354 }
6355 }
6356 }
6357
6358 if (Record->getIdentifier()) {
6359 // C++ [class.mem]p13:
6360 // If T is the name of a class, then each of the following shall have a
6361 // name different from T:
6362 // - every member of every anonymous union that is a member of class T.
6363 //
6364 // C++ [class.mem]p14:
6365 // In addition, if class T has a user-declared constructor (12.1), every
6366 // non-static data member of class T shall have a name different from T.
6367 DeclContext::lookup_result R = Record->lookup(Record->getDeclName());
6368 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E;
6369 ++I) {
6370 NamedDecl *D = (*I)->getUnderlyingDecl();
6371 if (((isa<FieldDecl>(D) || isa<UnresolvedUsingValueDecl>(D)) &&
6372 Record->hasUserDeclaredConstructor()) ||
6373 isa<IndirectFieldDecl>(D)) {
6374 Diag((*I)->getLocation(), diag::err_member_name_of_class)
6375 << D->getDeclName();
6376 break;
6377 }
6378 }
6379 }
6380
6381 // Warn if the class has virtual methods but non-virtual public destructor.
6382 if (Record->isPolymorphic() && !Record->isDependentType()) {
6383 CXXDestructorDecl *dtor = Record->getDestructor();
6384 if ((!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) &&
6385 !Record->hasAttr<FinalAttr>())
6386 Diag(dtor ? dtor->getLocation() : Record->getLocation(),
6387 diag::warn_non_virtual_dtor) << Context.getRecordType(Record);
6388 }
6389
6390 if (Record->isAbstract()) {
6391 if (FinalAttr *FA = Record->getAttr<FinalAttr>()) {
6392 Diag(Record->getLocation(), diag::warn_abstract_final_class)
6393 << FA->isSpelledAsSealed();
6394 DiagnoseAbstractType(Record);
6395 }
6396 }
6397
6398 // Warn if the class has a final destructor but is not itself marked final.
6399 if (!Record->hasAttr<FinalAttr>()) {
6400 if (const CXXDestructorDecl *dtor = Record->getDestructor()) {
6401 if (const FinalAttr *FA = dtor->getAttr<FinalAttr>()) {
6402 Diag(FA->getLocation(), diag::warn_final_dtor_non_final_class)
6403 << FA->isSpelledAsSealed()
6404 << FixItHint::CreateInsertion(
6405 getLocForEndOfToken(Record->getLocation()),
6406 (FA->isSpelledAsSealed() ? " sealed" : " final"));
6407 Diag(Record->getLocation(),
6408 diag::note_final_dtor_non_final_class_silence)
6409 << Context.getRecordType(Record) << FA->isSpelledAsSealed();
6410 }
6411 }
6412 }
6413
6414 // See if trivial_abi has to be dropped.
6415 if (Record->hasAttr<TrivialABIAttr>())
6416 checkIllFormedTrivialABIStruct(*Record);
6417
6418 // Set HasTrivialSpecialMemberForCall if the record has attribute
6419 // "trivial_abi".
6420 bool HasTrivialABI = Record->hasAttr<TrivialABIAttr>();
6421
6422 if (HasTrivialABI)
6423 Record->setHasTrivialSpecialMemberForCall();
6424
6425 // Explicitly-defaulted secondary comparison functions (!=, <, <=, >, >=).
6426 // We check these last because they can depend on the properties of the
6427 // primary comparison functions (==, <=>).
6428 llvm::SmallVector<FunctionDecl*, 5> DefaultedSecondaryComparisons;
6429
6430 auto CheckForDefaultedFunction = [&](FunctionDecl *FD) {
6431 if (!FD || FD->isInvalidDecl() || !FD->isExplicitlyDefaulted())
6432 return;
6433
6434 DefaultedFunctionKind DFK = getDefaultedFunctionKind(FD);
6435 if (DFK.asComparison() == DefaultedComparisonKind::NotEqual ||
6436 DFK.asComparison() == DefaultedComparisonKind::Relational)
6437 DefaultedSecondaryComparisons.push_back(FD);
6438 else
6439 CheckExplicitlyDefaultedFunction(S, FD);
6440 };
6441
6442 auto CompleteMemberFunction = [&](CXXMethodDecl *M) {
6443 // Check whether the explicitly-defaulted members are valid.
6444 CheckForDefaultedFunction(M);
6445
6446 // Skip the rest of the checks for a member of a dependent class.
6447 if (Record->isDependentType())
6448 return;
6449
6450 // For an explicitly defaulted or deleted special member, we defer
6451 // determining triviality until the class is complete. That time is now!
6452 CXXSpecialMember CSM = getSpecialMember(M);
6453 if (!M->isImplicit() && !M->isUserProvided()) {
6454 if (CSM != CXXInvalid) {
6455 M->setTrivial(SpecialMemberIsTrivial(M, CSM));
6456 // Inform the class that we've finished declaring this member.
6457 Record->finishedDefaultedOrDeletedMember(M);
6458 M->setTrivialForCall(
6459 HasTrivialABI ||
6460 SpecialMemberIsTrivial(M, CSM, TAH_ConsiderTrivialABI));
6461 Record->setTrivialForCallFlags(M);
6462 }
6463 }
6464
6465 // Set triviality for the purpose of calls if this is a user-provided
6466 // copy/move constructor or destructor.
6467 if ((CSM == CXXCopyConstructor || CSM == CXXMoveConstructor ||
6468 CSM == CXXDestructor) && M->isUserProvided()) {
6469 M->setTrivialForCall(HasTrivialABI);
6470 Record->setTrivialForCallFlags(M);
6471 }
6472
6473 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted() &&
6474 M->hasAttr<DLLExportAttr>()) {
6475 if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) &&
6476 M->isTrivial() &&
6477 (CSM == CXXDefaultConstructor || CSM == CXXCopyConstructor ||
6478 CSM == CXXDestructor))
6479 M->dropAttr<DLLExportAttr>();
6480
6481 if (M->hasAttr<DLLExportAttr>()) {
6482 // Define after any fields with in-class initializers have been parsed.
6483 DelayedDllExportMemberFunctions.push_back(M);
6484 }
6485 }
6486
6487 // Define defaulted constexpr virtual functions that override a base class
6488 // function right away.
6489 // FIXME: We can defer doing this until the vtable is marked as used.
6490 if (M->isDefaulted() && M->isConstexpr() && M->size_overridden_methods())
6491 DefineImplicitSpecialMember(*this, M, M->getLocation());
6492 };
6493
6494 // Check the destructor before any other member function. We need to
6495 // determine whether it's trivial in order to determine whether the claas
6496 // type is a literal type, which is a prerequisite for determining whether
6497 // other special member functions are valid and whether they're implicitly
6498 // 'constexpr'.
6499 if (CXXDestructorDecl *Dtor = Record->getDestructor())
6500 CompleteMemberFunction(Dtor);
6501
6502 bool HasMethodWithOverrideControl = false,
6503 HasOverridingMethodWithoutOverrideControl = false;
6504 for (auto *D : Record->decls()) {
6505 if (auto *M = dyn_cast<CXXMethodDecl>(D)) {
6506 // FIXME: We could do this check for dependent types with non-dependent
6507 // bases.
6508 if (!Record->isDependentType()) {
6509 // See if a method overloads virtual methods in a base
6510 // class without overriding any.
6511 if (!M->isStatic())
6512 DiagnoseHiddenVirtualMethods(M);
6513 if (M->hasAttr<OverrideAttr>())
6514 HasMethodWithOverrideControl = true;
6515 else if (M->size_overridden_methods() > 0)
6516 HasOverridingMethodWithoutOverrideControl = true;
6517 }
6518
6519 if (!isa<CXXDestructorDecl>(M))
6520 CompleteMemberFunction(M);
6521 } else if (auto *F = dyn_cast<FriendDecl>(D)) {
6522 CheckForDefaultedFunction(
6523 dyn_cast_or_null<FunctionDecl>(F->getFriendDecl()));
6524 }
6525 }
6526
6527 if (HasMethodWithOverrideControl &&
6528 HasOverridingMethodWithoutOverrideControl) {
6529 // At least one method has the 'override' control declared.
6530 // Diagnose all other overridden methods which do not have 'override'
6531 // specified on them.
6532 for (auto *M : Record->methods())
6533 DiagnoseAbsenceOfOverrideControl(M);
6534 }
6535
6536 // Check the defaulted secondary comparisons after any other member functions.
6537 for (FunctionDecl *FD : DefaultedSecondaryComparisons)
6538 CheckExplicitlyDefaultedFunction(S, FD);
6539
6540 // ms_struct is a request to use the same ABI rules as MSVC. Check
6541 // whether this class uses any C++ features that are implemented
6542 // completely differently in MSVC, and if so, emit a diagnostic.
6543 // That diagnostic defaults to an error, but we allow projects to
6544 // map it down to a warning (or ignore it). It's a fairly common
6545 // practice among users of the ms_struct pragma to mass-annotate
6546 // headers, sweeping up a bunch of types that the project doesn't
6547 // really rely on MSVC-compatible layout for. We must therefore
6548 // support "ms_struct except for C++ stuff" as a secondary ABI.
6549 if (Record->isMsStruct(Context) &&
6550 (Record->isPolymorphic() || Record->getNumBases())) {
6551 Diag(Record->getLocation(), diag::warn_cxx_ms_struct);
6552 }
6553
6554 checkClassLevelDLLAttribute(Record);
6555 checkClassLevelCodeSegAttribute(Record);
6556
6557 bool ClangABICompat4 =
6558 Context.getLangOpts().getClangABICompat() <= LangOptions::ClangABI::Ver4;
6559 TargetInfo::CallingConvKind CCK =
6560 Context.getTargetInfo().getCallingConvKind(ClangABICompat4);
6561 bool CanPass = canPassInRegisters(*this, Record, CCK);
6562
6563 // Do not change ArgPassingRestrictions if it has already been set to
6564 // APK_CanNeverPassInRegs.
6565 if (Record->getArgPassingRestrictions() != RecordDecl::APK_CanNeverPassInRegs)
6566 Record->setArgPassingRestrictions(CanPass
6567 ? RecordDecl::APK_CanPassInRegs
6568 : RecordDecl::APK_CannotPassInRegs);
6569
6570 // If canPassInRegisters returns true despite the record having a non-trivial
6571 // destructor, the record is destructed in the callee. This happens only when
6572 // the record or one of its subobjects has a field annotated with trivial_abi
6573 // or a field qualified with ObjC __strong/__weak.
6574 if (Context.getTargetInfo().getCXXABI().areArgsDestroyedLeftToRightInCallee())
6575 Record->setParamDestroyedInCallee(true);
6576 else if (Record->hasNonTrivialDestructor())
6577 Record->setParamDestroyedInCallee(CanPass);
6578
6579 if (getLangOpts().ForceEmitVTables) {
6580 // If we want to emit all the vtables, we need to mark it as used. This
6581 // is especially required for cases like vtable assumption loads.
6582 MarkVTableUsed(Record->getInnerLocStart(), Record);
6583 }
6584 }
6585
6586 /// Look up the special member function that would be called by a special
6587 /// member function for a subobject of class type.
6588 ///
6589 /// \param Class The class type of the subobject.
6590 /// \param CSM The kind of special member function.
6591 /// \param FieldQuals If the subobject is a field, its cv-qualifiers.
6592 /// \param ConstRHS True if this is a copy operation with a const object
6593 /// on its RHS, that is, if the argument to the outer special member
6594 /// function is 'const' and this is not a field marked 'mutable'.
6595 static Sema::SpecialMemberOverloadResult lookupCallFromSpecialMember(
6596 Sema &S, CXXRecordDecl *Class, Sema::CXXSpecialMember CSM,
6597 unsigned FieldQuals, bool ConstRHS) {
6598 unsigned LHSQuals = 0;
6599 if (CSM == Sema::CXXCopyAssignment || CSM == Sema::CXXMoveAssignment)
6600 LHSQuals = FieldQuals;
6601
6602 unsigned RHSQuals = FieldQuals;
6603 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor)
6604 RHSQuals = 0;
6605 else if (ConstRHS)
6606 RHSQuals |= Qualifiers::Const;
6607
6608 return S.LookupSpecialMember(Class, CSM,
6609 RHSQuals & Qualifiers::Const,
6610 RHSQuals & Qualifiers::Volatile,
6611 false,
6612 LHSQuals & Qualifiers::Const,
6613 LHSQuals & Qualifiers::Volatile);
6614 }
6615
6616 class Sema::InheritedConstructorInfo {
6617 Sema &S;
6618 SourceLocation UseLoc;
6619
6620 /// A mapping from the base classes through which the constructor was
6621 /// inherited to the using shadow declaration in that base class (or a null
6622 /// pointer if the constructor was declared in that base class).
6623 llvm::DenseMap<CXXRecordDecl *, ConstructorUsingShadowDecl *>
6624 InheritedFromBases;
6625
6626 public:
6627 InheritedConstructorInfo(Sema &S, SourceLocation UseLoc,
6628 ConstructorUsingShadowDecl *Shadow)
6629 : S(S), UseLoc(UseLoc) {
6630 bool DiagnosedMultipleConstructedBases = false;
6631 CXXRecordDecl *ConstructedBase = nullptr;
6632 UsingDecl *ConstructedBaseUsing = nullptr;
6633
6634 // Find the set of such base class subobjects and check that there's a
6635 // unique constructed subobject.
6636 for (auto *D : Shadow->redecls()) {
6637 auto *DShadow = cast<ConstructorUsingShadowDecl>(D);
6638 auto *DNominatedBase = DShadow->getNominatedBaseClass();
6639 auto *DConstructedBase = DShadow->getConstructedBaseClass();
6640
6641 InheritedFromBases.insert(
6642 std::make_pair(DNominatedBase->getCanonicalDecl(),
6643 DShadow->getNominatedBaseClassShadowDecl()));
6644 if (DShadow->constructsVirtualBase())
6645 InheritedFromBases.insert(
6646 std::make_pair(DConstructedBase->getCanonicalDecl(),
6647 DShadow->getConstructedBaseClassShadowDecl()));
6648 else
6649 assert(DNominatedBase == DConstructedBase);
6650
6651 // [class.inhctor.init]p2:
6652 // If the constructor was inherited from multiple base class subobjects
6653 // of type B, the program is ill-formed.
6654 if (!ConstructedBase) {
6655 ConstructedBase = DConstructedBase;
6656 ConstructedBaseUsing = D->getUsingDecl();
6657 } else if (ConstructedBase != DConstructedBase &&
6658 !Shadow->isInvalidDecl()) {
6659 if (!DiagnosedMultipleConstructedBases) {
6660 S.Diag(UseLoc, diag::err_ambiguous_inherited_constructor)
6661 << Shadow->getTargetDecl();
6662 S.Diag(ConstructedBaseUsing->getLocation(),
6663 diag::note_ambiguous_inherited_constructor_using)
6664 << ConstructedBase;
6665 DiagnosedMultipleConstructedBases = true;
6666 }
6667 S.Diag(D->getUsingDecl()->getLocation(),
6668 diag::note_ambiguous_inherited_constructor_using)
6669 << DConstructedBase;
6670 }
6671 }
6672
6673 if (DiagnosedMultipleConstructedBases)
6674 Shadow->setInvalidDecl();
6675 }
6676
6677 /// Find the constructor to use for inherited construction of a base class,
6678 /// and whether that base class constructor inherits the constructor from a
6679 /// virtual base class (in which case it won't actually invoke it).
6680 std::pair<CXXConstructorDecl *, bool>
6681 findConstructorForBase(CXXRecordDecl *Base, CXXConstructorDecl *Ctor) const {
6682 auto It = InheritedFromBases.find(Base->getCanonicalDecl());
6683 if (It == InheritedFromBases.end())
6684 return std::make_pair(nullptr, false);
6685
6686 // This is an intermediary class.
6687 if (It->second)
6688 return std::make_pair(
6689 S.findInheritingConstructor(UseLoc, Ctor, It->second),
6690 It->second->constructsVirtualBase());
6691
6692 // This is the base class from which the constructor was inherited.
6693 return std::make_pair(Ctor, false);
6694 }
6695 };
6696
6697 /// Is the special member function which would be selected to perform the
6698 /// specified operation on the specified class type a constexpr constructor?
6699 static bool
6700 specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl,
6701 Sema::CXXSpecialMember CSM, unsigned Quals,
6702 bool ConstRHS,
6703 CXXConstructorDecl *InheritedCtor = nullptr,
6704 Sema::InheritedConstructorInfo *Inherited = nullptr) {
6705 // If we're inheriting a constructor, see if we need to call it for this base
6706 // class.
6707 if (InheritedCtor) {
6708 assert(CSM == Sema::CXXDefaultConstructor);
6709 auto BaseCtor =
6710 Inherited->findConstructorForBase(ClassDecl, InheritedCtor).first;
6711 if (BaseCtor)
6712 return BaseCtor->isConstexpr();
6713 }
6714
6715 if (CSM == Sema::CXXDefaultConstructor)
6716 return ClassDecl->hasConstexprDefaultConstructor();
6717 if (CSM == Sema::CXXDestructor)
6718 return ClassDecl->hasConstexprDestructor();
6719
6720 Sema::SpecialMemberOverloadResult SMOR =
6721 lookupCallFromSpecialMember(S, ClassDecl, CSM, Quals, ConstRHS);
6722 if (!SMOR.getMethod())
6723 // A constructor we wouldn't select can't be "involved in initializing"
6724 // anything.
6725 return true;
6726 return SMOR.getMethod()->isConstexpr();
6727 }
6728
6729 /// Determine whether the specified special member function would be constexpr
6730 /// if it were implicitly defined.
6731 static bool defaultedSpecialMemberIsConstexpr(
6732 Sema &S, CXXRecordDecl *ClassDecl, Sema::CXXSpecialMember CSM,
6733 bool ConstArg, CXXConstructorDecl *InheritedCtor = nullptr,
6734 Sema::InheritedConstructorInfo *Inherited = nullptr) {
6735 if (!S.getLangOpts().CPlusPlus11)
6736 return false;
6737
6738 // C++11 [dcl.constexpr]p4:
6739 // In the definition of a constexpr constructor [...]
6740 bool Ctor = true;
6741 switch (CSM) {
6742 case Sema::CXXDefaultConstructor:
6743 if (Inherited)
6744 break;
6745 // Since default constructor lookup is essentially trivial (and cannot
6746 // involve, for instance, template instantiation), we compute whether a
6747 // defaulted default constructor is constexpr directly within CXXRecordDecl.
6748 //
6749 // This is important for performance; we need to know whether the default
6750 // constructor is constexpr to determine whether the type is a literal type.
6751 return ClassDecl->defaultedDefaultConstructorIsConstexpr();
6752
6753 case Sema::CXXCopyConstructor:
6754 case Sema::CXXMoveConstructor:
6755 // For copy or move constructors, we need to perform overload resolution.
6756 break;
6757
6758 case Sema::CXXCopyAssignment:
6759 case Sema::CXXMoveAssignment:
6760 if (!S.getLangOpts().CPlusPlus14)
6761 return false;
6762 // In C++1y, we need to perform overload resolution.
6763 Ctor = false;
6764 break;
6765
6766 case Sema::CXXDestructor:
6767 return ClassDecl->defaultedDestructorIsConstexpr();
6768
6769 case Sema::CXXInvalid:
6770 return false;
6771 }
6772
6773 // -- if the class is a non-empty union, or for each non-empty anonymous
6774 // union member of a non-union class, exactly one non-static data member
6775 // shall be initialized; [DR1359]
6776 //
6777 // If we squint, this is guaranteed, since exactly one non-static data member
6778 // will be initialized (if the constructor isn't deleted), we just don't know
6779 // which one.
6780 if (Ctor && ClassDecl->isUnion())
6781 return CSM == Sema::CXXDefaultConstructor
6782 ? ClassDecl->hasInClassInitializer() ||
6783 !ClassDecl->hasVariantMembers()
6784 : true;
6785
6786 // -- the class shall not have any virtual base classes;
6787 if (Ctor && ClassDecl->getNumVBases())
6788 return false;
6789
6790 // C++1y [class.copy]p26:
6791 // -- [the class] is a literal type, and
6792 if (!Ctor && !ClassDecl->isLiteral())
6793 return false;
6794
6795 // -- every constructor involved in initializing [...] base class
6796 // sub-objects shall be a constexpr constructor;
6797 // -- the assignment operator selected to copy/move each direct base
6798 // class is a constexpr function, and
6799 for (const auto &B : ClassDecl->bases()) {
6800 const RecordType *BaseType = B.getType()->getAs<RecordType>();
6801 if (!BaseType) continue;
6802
6803 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
6804 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, 0, ConstArg,
6805 InheritedCtor, Inherited))
6806 return false;
6807 }
6808
6809 // -- every constructor involved in initializing non-static data members
6810 // [...] shall be a constexpr constructor;
6811 // -- every non-static data member and base class sub-object shall be
6812 // initialized
6813 // -- for each non-static data member of X that is of class type (or array
6814 // thereof), the assignment operator selected to copy/move that member is
6815 // a constexpr function
6816 for (const auto *F : ClassDecl->fields()) {
6817 if (F->isInvalidDecl())
6818 continue;
6819 if (CSM == Sema::CXXDefaultConstructor && F->hasInClassInitializer())
6820 continue;
6821 QualType BaseType = S.Context.getBaseElementType(F->getType());
6822 if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) {
6823 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
6824 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM,
6825 BaseType.getCVRQualifiers(),
6826 ConstArg && !F->isMutable()))
6827 return false;
6828 } else if (CSM == Sema::CXXDefaultConstructor) {
6829 return false;
6830 }
6831 }
6832
6833 // All OK, it's constexpr!
6834 return true;
6835 }
6836
6837 namespace {
6838 /// RAII object to register a defaulted function as having its exception
6839 /// specification computed.
6840 struct ComputingExceptionSpec {
6841 Sema &S;
6842
6843 ComputingExceptionSpec(Sema &S, FunctionDecl *FD, SourceLocation Loc)
6844 : S(S) {
6845 Sema::CodeSynthesisContext Ctx;
6846 Ctx.Kind = Sema::CodeSynthesisContext::ExceptionSpecEvaluation;
6847 Ctx.PointOfInstantiation = Loc;
6848 Ctx.Entity = FD;
6849 S.pushCodeSynthesisContext(Ctx);
6850 }
6851 ~ComputingExceptionSpec() {
6852 S.popCodeSynthesisContext();
6853 }
6854 };
6855 }
6856
6857 static Sema::ImplicitExceptionSpecification
6858 ComputeDefaultedSpecialMemberExceptionSpec(
6859 Sema &S, SourceLocation Loc, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM,
6860 Sema::InheritedConstructorInfo *ICI);
6861
6862 static Sema::ImplicitExceptionSpecification
6863 ComputeDefaultedComparisonExceptionSpec(Sema &S, SourceLocation Loc,
6864 FunctionDecl *FD,
6865 Sema::DefaultedComparisonKind DCK);
6866
6867 static Sema::ImplicitExceptionSpecification
6868 computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, FunctionDecl *FD) {
6869 auto DFK = S.getDefaultedFunctionKind(FD);
6870 if (DFK.isSpecialMember())
6871 return ComputeDefaultedSpecialMemberExceptionSpec(
6872 S, Loc, cast<CXXMethodDecl>(FD), DFK.asSpecialMember(), nullptr);
6873 if (DFK.isComparison())
6874 return ComputeDefaultedComparisonExceptionSpec(S, Loc, FD,
6875 DFK.asComparison());
6876
6877 auto *CD = cast<CXXConstructorDecl>(FD);
6878 assert(CD->getInheritedConstructor() &&
6879 "only defaulted functions and inherited constructors have implicit "
6880 "exception specs");
6881 Sema::InheritedConstructorInfo ICI(
6882 S, Loc, CD->getInheritedConstructor().getShadowDecl());
6883 return ComputeDefaultedSpecialMemberExceptionSpec(
6884 S, Loc, CD, Sema::CXXDefaultConstructor, &ICI);
6885 }
6886
6887 static FunctionProtoType::ExtProtoInfo getImplicitMethodEPI(Sema &S,
6888 CXXMethodDecl *MD) {
6889 FunctionProtoType::ExtProtoInfo EPI;
6890
6891 // Build an exception specification pointing back at this member.
6892 EPI.ExceptionSpec.Type = EST_Unevaluated;
6893 EPI.ExceptionSpec.SourceDecl = MD;
6894
6895 // Set the calling convention to the default for C++ instance methods.
6896 EPI.ExtInfo = EPI.ExtInfo.withCallingConv(
6897 S.Context.getDefaultCallingConvention(/*IsVariadic=*/false,
6898 /*IsCXXMethod=*/true));
6899 return EPI;
6900 }
6901
6902 void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, FunctionDecl *FD) {
6903 const FunctionProtoType *FPT = FD->getType()->castAs<FunctionProtoType>();
6904 if (FPT->getExceptionSpecType() != EST_Unevaluated)
6905 return;
6906
6907 // Evaluate the exception specification.
6908 auto IES = computeImplicitExceptionSpec(*this, Loc, FD);
6909 auto ESI = IES.getExceptionSpec();
6910
6911 // Update the type of the special member to use it.
6912 UpdateExceptionSpec(FD, ESI);
6913 }
6914
6915 void Sema::CheckExplicitlyDefaultedFunction(Scope *S, FunctionDecl *FD) {
6916 assert(FD->isExplicitlyDefaulted() && "not explicitly-defaulted");
6917
6918 DefaultedFunctionKind DefKind = getDefaultedFunctionKind(FD);
6919 if (!DefKind) {
6920 assert(FD->getDeclContext()->isDependentContext());
6921 return;
6922 }
6923
6924 if (DefKind.isSpecialMember()
6925 ? CheckExplicitlyDefaultedSpecialMember(cast<CXXMethodDecl>(FD),
6926 DefKind.asSpecialMember())
6927 : CheckExplicitlyDefaultedComparison(S, FD, DefKind.asComparison()))
6928 FD->setInvalidDecl();
6929 }
6930
6931 bool Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD,
6932 CXXSpecialMember CSM) {
6933 CXXRecordDecl *RD = MD->getParent();
6934
6935 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid &&
6936 "not an explicitly-defaulted special member");
6937
6938 // Defer all checking for special members of a dependent type.
6939 if (RD->isDependentType())
6940 return false;
6941
6942 // Whether this was the first-declared instance of the constructor.
6943 // This affects whether we implicitly add an exception spec and constexpr.
6944 bool First = MD == MD->getCanonicalDecl();
6945
6946 bool HadError = false;
6947
6948 // C++11 [dcl.fct.def.default]p1:
6949 // A function that is explicitly defaulted shall
6950 // -- be a special member function [...] (checked elsewhere),
6951 // -- have the same type (except for ref-qualifiers, and except that a
6952 // copy operation can take a non-const reference) as an implicit
6953 // declaration, and
6954 // -- not have default arguments.
6955 // C++2a changes the second bullet to instead delete the function if it's
6956 // defaulted on its first declaration, unless it's "an assignment operator,
6957 // and its return type differs or its parameter type is not a reference".
6958 bool DeleteOnTypeMismatch = getLangOpts().CPlusPlus2a && First;
6959 bool ShouldDeleteForTypeMismatch = false;
6960 unsigned ExpectedParams = 1;
6961 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor)
6962 ExpectedParams = 0;
6963 if (MD->getNumParams() != ExpectedParams) {
6964 // This checks for default arguments: a copy or move constructor with a
6965 // default argument is classified as a default constructor, and assignment
6966 // operations and destructors can't have default arguments.
6967 Diag(MD->getLocation(), diag::err_defaulted_special_member_params)
6968 << CSM << MD->getSourceRange();
6969 HadError = true;
6970 } else if (MD->isVariadic()) {
6971 if (DeleteOnTypeMismatch)
6972 ShouldDeleteForTypeMismatch = true;
6973 else {
6974 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic)
6975 << CSM << MD->getSourceRange();
6976 HadError = true;
6977 }
6978 }
6979
6980 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>();
6981
6982 bool CanHaveConstParam = false;
6983 if (CSM == CXXCopyConstructor)
6984 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam();
6985 else if (CSM == CXXCopyAssignment)
6986 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam();
6987
6988 QualType ReturnType = Context.VoidTy;
6989 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) {
6990 // Check for return type matching.
6991 ReturnType = Type->getReturnType();
6992
6993 QualType DeclType = Context.getTypeDeclType(RD);
6994 DeclType = Context.getAddrSpaceQualType(DeclType, MD->getMethodQualifiers().getAddressSpace());
6995 QualType ExpectedReturnType = Context.getLValueReferenceType(DeclType);
6996
6997 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) {
6998 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type)
6999 << (CSM == CXXMoveAssignment) << ExpectedReturnType;
7000 HadError = true;
7001 }
7002
7003 // A defaulted special member cannot have cv-qualifiers.
7004 if (Type->getMethodQuals().hasConst() || Type->getMethodQuals().hasVolatile()) {
7005 if (DeleteOnTypeMismatch)
7006 ShouldDeleteForTypeMismatch = true;
7007 else {
7008 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals)
7009 << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus14;
7010 HadError = true;
7011 }
7012 }
7013 }
7014
7015 // Check for parameter type matching.
7016 QualType ArgType = ExpectedParams ? Type->getParamType(0) : QualType();
7017 bool HasConstParam = false;
7018 if (ExpectedParams && ArgType->isReferenceType()) {
7019 // Argument must be reference to possibly-const T.
7020 QualType ReferentType = ArgType->getPointeeType();
7021 HasConstParam = ReferentType.isConstQualified();
7022
7023 if (ReferentType.isVolatileQualified()) {
7024 if (DeleteOnTypeMismatch)
7025 ShouldDeleteForTypeMismatch = true;
7026 else {
7027 Diag(MD->getLocation(),
7028 diag::err_defaulted_special_member_volatile_param) << CSM;
7029 HadError = true;
7030 }
7031 }
7032
7033 if (HasConstParam && !CanHaveConstParam) {
7034 if (DeleteOnTypeMismatch)
7035 ShouldDeleteForTypeMismatch = true;
7036 else if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) {
7037 Diag(MD->getLocation(),
7038 diag::err_defaulted_special_member_copy_const_param)
7039 << (CSM == CXXCopyAssignment);
7040 // FIXME: Explain why this special member can't be const.
7041 HadError = true;
7042 } else {
7043 Diag(MD->getLocation(),
7044 diag::err_defaulted_special_member_move_const_param)
7045 << (CSM == CXXMoveAssignment);
7046 HadError = true;
7047 }
7048 }
7049 } else if (ExpectedParams) {
7050 // A copy assignment operator can take its argument by value, but a
7051 // defaulted one cannot.
7052 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument");
7053 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref);
7054 HadError = true;
7055 }
7056
7057 // C++11 [dcl.fct.def.default]p2:
7058 // An explicitly-defaulted function may be declared constexpr only if it
7059 // would have been implicitly declared as constexpr,
7060 // Do not apply this rule to members of class templates, since core issue 1358
7061 // makes such functions always instantiate to constexpr functions. For
7062 // functions which cannot be constexpr (for non-constructors in C++11 and for
7063 // destructors in C++14 and C++17), this is checked elsewhere.
7064 //
7065 // FIXME: This should not apply if the member is deleted.
7066 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM,
7067 HasConstParam);
7068 if ((getLangOpts().CPlusPlus2a ||
7069 (getLangOpts().CPlusPlus14 ? !isa<CXXDestructorDecl>(MD)
7070 : isa<CXXConstructorDecl>(MD))) &&
7071 MD->isConstexpr() && !Constexpr &&
7072 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) {
7073 Diag(MD->getBeginLoc(), MD->isConsteval()
7074 ? diag::err_incorrect_defaulted_consteval
7075 : diag::err_incorrect_defaulted_constexpr)
7076 << CSM;
7077 // FIXME: Explain why the special member can't be constexpr.
7078 HadError = true;
7079 }
7080
7081 if (First) {
7082 // C++2a [dcl.fct.def.default]p3:
7083 // If a function is explicitly defaulted on its first declaration, it is
7084 // implicitly considered to be constexpr if the implicit declaration
7085 // would be.
7086 MD->setConstexprKind(Constexpr ? CSK_constexpr : CSK_unspecified);
7087
7088 if (!Type->hasExceptionSpec()) {
7089 // C++2a [except.spec]p3:
7090 // If a declaration of a function does not have a noexcept-specifier
7091 // [and] is defaulted on its first declaration, [...] the exception
7092 // specification is as specified below
7093 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo();
7094 EPI.ExceptionSpec.Type = EST_Unevaluated;
7095 EPI.ExceptionSpec.SourceDecl = MD;
7096 MD->setType(Context.getFunctionType(ReturnType,
7097 llvm::makeArrayRef(&ArgType,
7098 ExpectedParams),
7099 EPI));
7100 }
7101 }
7102
7103 if (ShouldDeleteForTypeMismatch || ShouldDeleteSpecialMember(MD, CSM)) {
7104 if (First) {
7105 SetDeclDeleted(MD, MD->getLocation());
7106 if (!inTemplateInstantiation() && !HadError) {
7107 Diag(MD->getLocation(), diag::warn_defaulted_method_deleted) << CSM;
7108 if (ShouldDeleteForTypeMismatch) {
7109 Diag(MD->getLocation(), diag::note_deleted_type_mismatch) << CSM;
7110 } else {
7111 ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true);
7112 }
7113 }
7114 if (ShouldDeleteForTypeMismatch && !HadError) {
7115 Diag(MD->getLocation(),
7116 diag::warn_cxx17_compat_defaulted_method_type_mismatch) << CSM;
7117 }
7118 } else {
7119 // C++11 [dcl.fct.def.default]p4:
7120 // [For a] user-provided explicitly-defaulted function [...] if such a
7121 // function is implicitly defined as deleted, the program is ill-formed.
7122 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM;
7123 assert(!ShouldDeleteForTypeMismatch && "deleted non-first decl");
7124 ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true);
7125 HadError = true;
7126 }
7127 }
7128
7129 return HadError;
7130 }
7131
7132 namespace {
7133 /// Helper class for building and checking a defaulted comparison.
7134 ///
7135 /// Defaulted functions are built in two phases:
7136 ///
7137 /// * First, the set of operations that the function will perform are
7138 /// identified, and some of them are checked. If any of the checked
7139 /// operations is invalid in certain ways, the comparison function is
7140 /// defined as deleted and no body is built.
7141 /// * Then, if the function is not defined as deleted, the body is built.
7142 ///
7143 /// This is accomplished by performing two visitation steps over the eventual
7144 /// body of the function.
7145 template<typename Derived, typename ResultList, typename Result,
7146 typename Subobject>
7147 class DefaultedComparisonVisitor {
7148 public:
7149 using DefaultedComparisonKind = Sema::DefaultedComparisonKind;
7150
7151 DefaultedComparisonVisitor(Sema &S, CXXRecordDecl *RD, FunctionDecl *FD,
7152 DefaultedComparisonKind DCK)
7153 : S(S), RD(RD), FD(FD), DCK(DCK) {
7154 if (auto *Info = FD->getDefaultedFunctionInfo()) {
7155 // FIXME: Change CreateOverloadedBinOp to take an ArrayRef instead of an
7156 // UnresolvedSet to avoid this copy.
7157 Fns.assign(Info->getUnqualifiedLookups().begin(),
7158 Info->getUnqualifiedLookups().end());
7159 }
7160 }
7161
7162 ResultList visit() {
7163 // The type of an lvalue naming a parameter of this function.
7164 QualType ParamLvalType =
7165 FD->getParamDecl(0)->getType().getNonReferenceType();
7166
7167 ResultList Results;
7168
7169 switch (DCK) {
7170 case DefaultedComparisonKind::None:
7171 llvm_unreachable("not a defaulted comparison");
7172
7173 case DefaultedComparisonKind::Equal:
7174 case DefaultedComparisonKind::ThreeWay:
7175 getDerived().visitSubobjects(Results, RD, ParamLvalType.getQualifiers());
7176 return Results;
7177
7178 case DefaultedComparisonKind::NotEqual:
7179 case DefaultedComparisonKind::Relational:
7180 Results.add(getDerived().visitExpandedSubobject(
7181 ParamLvalType, getDerived().getCompleteObject()));
7182 return Results;
7183 }
7184 llvm_unreachable("");
7185 }
7186
7187 protected:
7188 Derived &getDerived() { return static_cast<Derived&>(*this); }
7189
7190 /// Visit the expanded list of subobjects of the given type, as specified in
7191 /// C++2a [class.compare.default].
7192 ///
7193 /// \return \c true if the ResultList object said we're done, \c false if not.
7194 bool visitSubobjects(ResultList &Results, CXXRecordDecl *Record,
7195 Qualifiers Quals) {
7196 // C++2a [class.compare.default]p4:
7197 // The direct base class subobjects of C
7198 for (CXXBaseSpecifier &Base : Record->bases())
7199 if (Results.add(getDerived().visitSubobject(
7200 S.Context.getQualifiedType(Base.getType(), Quals),
7201 getDerived().getBase(&Base))))
7202 return true;
7203
7204 // followed by the non-static data members of C
7205 for (FieldDecl *Field : Record->fields()) {
7206 // Recursively expand anonymous structs.
7207 if (Field->isAnonymousStructOrUnion()) {
7208 if (visitSubobjects(Results, Field->getType()->getAsCXXRecordDecl(),
7209 Quals))
7210 return true;
7211 continue;
7212 }
7213
7214 // Figure out the type of an lvalue denoting this field.
7215 Qualifiers FieldQuals = Quals;
7216 if (Field->isMutable())
7217 FieldQuals.removeConst();
7218 QualType FieldType =
7219 S.Context.getQualifiedType(Field->getType(), FieldQuals);
7220
7221 if (Results.add(getDerived().visitSubobject(
7222 FieldType, getDerived().getField(Field))))
7223 return true;
7224 }
7225
7226 // form a list of subobjects.
7227 return false;
7228 }
7229
7230 Result visitSubobject(QualType Type, Subobject Subobj) {
7231 // In that list, any subobject of array type is recursively expanded
7232 const ArrayType *AT = S.Context.getAsArrayType(Type);
7233 if (auto *CAT = dyn_cast_or_null<ConstantArrayType>(AT))
7234 return getDerived().visitSubobjectArray(CAT->getElementType(),
7235 CAT->getSize(), Subobj);
7236 return getDerived().visitExpandedSubobject(Type, Subobj);
7237 }
7238
7239 Result visitSubobjectArray(QualType Type, const llvm::APInt &Size,
7240 Subobject Subobj) {
7241 return getDerived().visitSubobject(Type, Subobj);
7242 }
7243
7244 protected:
7245 Sema &S;
7246 CXXRecordDecl *RD;
7247 FunctionDecl *FD;
7248 DefaultedComparisonKind DCK;
7249 UnresolvedSet<16> Fns;
7250 };
7251
7252 /// Information about a defaulted comparison, as determined by
7253 /// DefaultedComparisonAnalyzer.
7254 struct DefaultedComparisonInfo {
7255 bool Deleted = false;
7256 bool Constexpr = true;
7257 ComparisonCategoryType Category = ComparisonCategoryType::StrongOrdering;
7258
7259 static DefaultedComparisonInfo deleted() {
7260 DefaultedComparisonInfo Deleted;
7261 Deleted.Deleted = true;
7262 return Deleted;
7263 }
7264
7265 bool add(const DefaultedComparisonInfo &R) {
7266 Deleted |= R.Deleted;
7267 Constexpr &= R.Constexpr;
7268 Category = commonComparisonType(Category, R.Category);
7269 return Deleted;
7270 }
7271 };
7272
7273 /// An element in the expanded list of subobjects of a defaulted comparison, as
7274 /// specified in C++2a [class.compare.default]p4.
7275 struct DefaultedComparisonSubobject {
7276 enum { CompleteObject, Member, Base } Kind;
7277 NamedDecl *Decl;
7278 SourceLocation Loc;
7279 };
7280
7281 /// A visitor over the notional body of a defaulted comparison that determines
7282 /// whether that body would be deleted or constexpr.
7283 class DefaultedComparisonAnalyzer
7284 : public DefaultedComparisonVisitor<DefaultedComparisonAnalyzer,
7285 DefaultedComparisonInfo,
7286 DefaultedComparisonInfo,
7287 DefaultedComparisonSubobject> {
7288 public:
7289 enum DiagnosticKind { NoDiagnostics, ExplainDeleted, ExplainConstexpr };
7290
7291 private:
7292 DiagnosticKind Diagnose;
7293
7294 public:
7295 using Base = DefaultedComparisonVisitor;
7296 using Result = DefaultedComparisonInfo;
7297 using Subobject = DefaultedComparisonSubobject;
7298
7299 friend Base;
7300
7301 DefaultedComparisonAnalyzer(Sema &S, CXXRecordDecl *RD, FunctionDecl *FD,
7302 DefaultedComparisonKind DCK,
7303 DiagnosticKind Diagnose = NoDiagnostics)
7304 : Base(S, RD, FD, DCK), Diagnose(Diagnose) {}
7305
7306 Result visit() {
7307 if ((DCK == DefaultedComparisonKind::Equal ||
7308 DCK == DefaultedComparisonKind::ThreeWay) &&
7309 RD->hasVariantMembers()) {
7310 // C++2a [class.compare.default]p2 [P2002R0]:
7311 // A defaulted comparison operator function for class C is defined as
7312 // deleted if [...] C has variant members.
7313 if (Diagnose == ExplainDeleted) {
7314 S.Diag(FD->getLocation(), diag::note_defaulted_comparison_union)
7315 << FD << RD->isUnion() << RD;
7316 }
7317 return Result::deleted();
7318 }
7319
7320 return Base::visit();
7321 }
7322
7323 private:
7324 Subobject getCompleteObject() {
7325 return Subobject{Subobject::CompleteObject, nullptr, FD->getLocation()};
7326 }
7327
7328 Subobject getBase(CXXBaseSpecifier *Base) {
7329 return Subobject{Subobject::Base, Base->getType()->getAsCXXRecordDecl(),
7330 Base->getBaseTypeLoc()};
7331 }
7332
7333 Subobject getField(FieldDecl *Field) {
7334 return Subobject{Subobject::Member, Field, Field->getLocation()};
7335 }
7336
7337 Result visitExpandedSubobject(QualType Type, Subobject Subobj) {
7338 // C++2a [class.compare.default]p2 [P2002R0]:
7339 // A defaulted <=> or == operator function for class C is defined as
7340 // deleted if any non-static data member of C is of reference type
7341 if (Type->isReferenceType()) {
7342 if (Diagnose == ExplainDeleted) {
7343 S.Diag(Subobj.Loc, diag::note_defaulted_comparison_reference_member)
7344 << FD << RD;
7345 }
7346 return Result::deleted();
7347 }
7348
7349 // [...] Let xi be an lvalue denoting the ith element [...]
7350 OpaqueValueExpr Xi(FD->getLocation(), Type, VK_LValue);
7351 Expr *Args[] = {&Xi, &Xi};
7352
7353 // All operators start by trying to apply that same operator recursively.
7354 OverloadedOperatorKind OO = FD->getOverloadedOperator();
7355 assert(OO != OO_None && "not an overloaded operator!");
7356 return visitBinaryOperator(OO, Args, Subobj);
7357 }
7358
7359 Result
7360 visitBinaryOperator(OverloadedOperatorKind OO, ArrayRef<Expr *> Args,
7361 Subobject Subobj,
7362 OverloadCandidateSet *SpaceshipCandidates = nullptr) {
7363 // Note that there is no need to consider rewritten candidates here if
7364 // we've already found there is no viable 'operator<=>' candidate (and are
7365 // considering synthesizing a '<=>' from '==' and '<').
7366 OverloadCandidateSet CandidateSet(
7367 FD->getLocation(), OverloadCandidateSet::CSK_Operator,
7368 OverloadCandidateSet::OperatorRewriteInfo(
7369 OO, /*AllowRewrittenCandidates=*/!SpaceshipCandidates));
7370
7371 /// C++2a [class.compare.default]p1 [P2002R0]:
7372 /// [...] the defaulted function itself is never a candidate for overload
7373 /// resolution [...]
7374 CandidateSet.exclude(FD);
7375
7376 S.LookupOverloadedBinOp(CandidateSet, OO, Fns, Args);
7377
7378 Result R;
7379
7380 OverloadCandidateSet::iterator Best;
7381 switch (CandidateSet.BestViableFunction(S, FD->getLocation(), Best)) {
7382 case OR_Success: {
7383 // C++2a [class.compare.secondary]p2 [P2002R0]:
7384 // The operator function [...] is defined as deleted if [...] the
7385 // candidate selected by overload resolution is not a rewritten
7386 // candidate.
7387 if ((DCK == DefaultedComparisonKind::NotEqual ||
7388 DCK == DefaultedComparisonKind::Relational) &&
7389 !Best->RewriteKind) {
7390 if (Diagnose == ExplainDeleted) {
7391 S.Diag(Best->Function->getLocation(),
7392 diag::note_defaulted_comparison_not_rewritten_callee)
7393 << FD;
7394 }
7395 return Result::deleted();
7396 }
7397
7398 // Throughout C++2a [class.compare]: if overload resolution does not
7399 // result in a usable function, the candidate function is defined as
7400 // deleted. This requires that we selected an accessible function.
7401 //
7402 // Note that this only considers the access of the function when named
7403 // within the type of the subobject, and not the access path for any
7404 // derived-to-base conversion.
7405 CXXRecordDecl *ArgClass = Args[0]->getType()->getAsCXXRecordDecl();
7406 if (ArgClass && Best->FoundDecl.getDecl() &&
7407 Best->FoundDecl.getDecl()->isCXXClassMember()) {
7408 QualType ObjectType = Subobj.Kind == Subobject::Member
7409 ? Args[0]->getType()
7410 : S.Context.getRecordType(RD);
7411 if (!S.isMemberAccessibleForDeletion(
7412 ArgClass, Best->FoundDecl, ObjectType, Subobj.Loc,
7413 Diagnose == ExplainDeleted
7414 ? S.PDiag(diag::note_defaulted_comparison_inaccessible)
7415 << FD << Subobj.Kind << Subobj.Decl
7416 : S.PDiag()))
7417 return Result::deleted();
7418 }
7419
7420 // C++2a [class.compare.default]p3 [P2002R0]:
7421 // A defaulted comparison function is constexpr-compatible if [...]
7422 // no overlod resolution performed [...] results in a non-constexpr
7423 // function.
7424 if (FunctionDecl *BestFD = Best->Function) {
7425 assert(!BestFD->isDeleted() && "wrong overload resolution result");
7426 // If it's not constexpr, explain why not.
7427 if (Diagnose == ExplainConstexpr && !BestFD->isConstexpr()) {
7428 if (Subobj.Kind != Subobject::CompleteObject)
7429 S.Diag(Subobj.Loc, diag::note_defaulted_comparison_not_constexpr)
7430 << Subobj.Kind << Subobj.Decl;
7431 S.Diag(BestFD->getLocation(),
7432 diag::note_defaulted_comparison_not_constexpr_here);
7433 // Bail out after explaining; we don't want any more notes.
7434 return Result::deleted();
7435 }
7436 R.Constexpr &= BestFD->isConstexpr();
7437 }
7438
7439 if (OO == OO_Spaceship && FD->getReturnType()->isUndeducedAutoType()) {
7440 if (auto *BestFD = Best->Function) {
7441 if (auto *Info = S.Context.CompCategories.lookupInfoForType(
7442 BestFD->getCallResultType())) {
7443 R.Category = Info->Kind;
7444 } else {
7445 if (Diagnose == ExplainDeleted) {
7446 S.Diag(Subobj.Loc, diag::note_defaulted_comparison_cannot_deduce)
7447 << Subobj.Kind << Subobj.Decl
7448 << BestFD->getCallResultType().withoutLocalFastQualifiers();
7449 S.Diag(BestFD->getLocation(),
7450 diag::note_defaulted_comparison_cannot_deduce_callee)
7451 << Subobj.Kind << Subobj.Decl;
7452 }
7453 return Result::deleted();
7454 }
7455 } else {
7456 Optional<ComparisonCategoryType> Cat =
7457 getComparisonCategoryForBuiltinCmp(Args[0]->getType());
7458 assert(Cat && "no category for builtin comparison?");
7459 R.Category = *Cat;
7460 }
7461 }
7462
7463 // Note that we might be rewriting to a different operator. That call is
7464 // not considered until we come to actually build the comparison function.
7465 break;
7466 }
7467
7468 case OR_Ambiguous:
7469 if (Diagnose == ExplainDeleted) {
7470 unsigned Kind = 0;
7471 if (FD->getOverloadedOperator() == OO_Spaceship && OO != OO_Spaceship)
7472 Kind = OO == OO_EqualEqual ? 1 : 2;
7473 CandidateSet.NoteCandidates(
7474 PartialDiagnosticAt(
7475 Subobj.Loc, S.PDiag(diag::note_defaulted_comparison_ambiguous)
7476 << FD << Kind << Subobj.Kind << Subobj.Decl),
7477 S, OCD_AmbiguousCandidates, Args);
7478 }
7479 R = Result::deleted();
7480 break;
7481
7482 case OR_Deleted:
7483 if (Diagnose == ExplainDeleted) {
7484 if ((DCK == DefaultedComparisonKind::NotEqual ||
7485 DCK == DefaultedComparisonKind::Relational) &&
7486 !Best->RewriteKind) {
7487 S.Diag(Best->Function->getLocation(),
7488 diag::note_defaulted_comparison_not_rewritten_callee)
7489 << FD;
7490 } else {
7491 S.Diag(Subobj.Loc,
7492 diag::note_defaulted_comparison_calls_deleted)
7493 << FD << Subobj.Kind << Subobj.Decl;
7494 S.NoteDeletedFunction(Best->Function);
7495 }
7496 }
7497 R = Result::deleted();
7498 break;
7499
7500 case OR_No_Viable_Function:
7501 // If there's no usable candidate, we're done unless we can rewrite a
7502 // '<=>' in terms of '==' and '<'.
7503 if (OO == OO_Spaceship &&
7504 S.Context.CompCategories.lookupInfoForType(FD->getReturnType())) {
7505 // For any kind of comparison category return type, we need a usable
7506 // '==' and a usable '<'.
7507 if (!R.add(visitBinaryOperator(OO_EqualEqual, Args, Subobj,
7508 &CandidateSet)))
7509 R.add(visitBinaryOperator(OO_Less, Args, Subobj, &CandidateSet));
7510 break;
7511 }
7512
7513 if (Diagnose == ExplainDeleted) {
7514 S.Diag(Subobj.Loc, diag::note_defaulted_comparison_no_viable_function)
7515 << FD << Subobj.Kind << Subobj.Decl;
7516
7517 // For a three-way comparison, list both the candidates for the
7518 // original operator and the candidates for the synthesized operator.
7519 if (SpaceshipCandidates) {
7520 SpaceshipCandidates->NoteCandidates(
7521 S, Args,
7522 SpaceshipCandidates->CompleteCandidates(S, OCD_AllCandidates,
7523 Args, FD->getLocation()));
7524 S.Diag(Subobj.Loc,
7525 diag::note_defaulted_comparison_no_viable_function_synthesized)
7526 << (OO == OO_EqualEqual ? 0 : 1);
7527 }
7528
7529 CandidateSet.NoteCandidates(
7530 S, Args,
7531 CandidateSet.CompleteCandidates(S, OCD_AllCandidates, Args,
7532 FD->getLocation()));
7533 }
7534 R = Result::deleted();
7535 break;
7536 }
7537
7538 return R;
7539 }
7540 };
7541
7542 /// A list of statements.
7543 struct StmtListResult {
7544 bool IsInvalid = false;
7545 llvm::SmallVector<Stmt*, 16> Stmts;
7546
7547 bool add(const StmtResult &S) {
7548 IsInvalid |= S.isInvalid();
7549 if (IsInvalid)
7550 return true;
7551 Stmts.push_back(S.get());
7552 return false;
7553 }
7554 };
7555
7556 /// A visitor over the notional body of a defaulted comparison that synthesizes
7557 /// the actual body.
7558 class DefaultedComparisonSynthesizer
7559 : public DefaultedComparisonVisitor<DefaultedComparisonSynthesizer,
7560 StmtListResult, StmtResult,
7561 std::pair<ExprResult, ExprResult>> {
7562 SourceLocation Loc;
7563 unsigned ArrayDepth = 0;
7564
7565 public:
7566 using Base = DefaultedComparisonVisitor;
7567 using ExprPair = std::pair<ExprResult, ExprResult>;
7568
7569 friend Base;
7570
7571 DefaultedComparisonSynthesizer(Sema &S, CXXRecordDecl *RD, FunctionDecl *FD,
7572 DefaultedComparisonKind DCK,
7573 SourceLocation BodyLoc)
7574 : Base(S, RD, FD, DCK), Loc(BodyLoc) {}
7575
7576 /// Build a suitable function body for this defaulted comparison operator.
7577 StmtResult build() {
7578 Sema::CompoundScopeRAII CompoundScope(S);
7579
7580 StmtListResult Stmts = visit();
7581 if (Stmts.IsInvalid)
7582 return StmtError();
7583
7584 ExprResult RetVal;
7585 switch (DCK) {
7586 case DefaultedComparisonKind::None:
7587 llvm_unreachable("not a defaulted comparison");
7588
7589 case DefaultedComparisonKind::Equal: {
7590 // C++2a [class.eq]p3:
7591 // [...] compar[e] the corresponding elements [...] until the first
7592 // index i where xi == yi yields [...] false. If no such index exists,
7593 // V is true. Otherwise, V is false.
7594 //
7595 // Join the comparisons with '&&'s and return the result. Use a right
7596 // fold (traversing the conditions right-to-left), because that
7597 // short-circuits more naturally.
7598 auto OldStmts = std::move(Stmts.Stmts);
7599 Stmts.Stmts.clear();
7600 ExprResult CmpSoFar;
7601 // Finish a particular comparison chain.
7602 auto FinishCmp = [&] {
7603 if (Expr *Prior = CmpSoFar.get()) {
7604 // Convert the last expression to 'return ...;'
7605 if (RetVal.isUnset() && Stmts.Stmts.empty())
7606 RetVal = CmpSoFar;
7607 // Convert any prior comparison to 'if (!(...)) return false;'
7608 else if (Stmts.add(buildIfNotCondReturnFalse(Prior)))
7609 return true;
7610 CmpSoFar = ExprResult();
7611 }
7612 return false;
7613 };
7614 for (Stmt *EAsStmt : llvm::reverse(OldStmts)) {
7615 Expr *E = dyn_cast<Expr>(EAsStmt);
7616 if (!E) {
7617 // Found an array comparison.
7618 if (FinishCmp() || Stmts.add(EAsStmt))
7619 return StmtError();
7620 continue;
7621 }
7622
7623 if (CmpSoFar.isUnset()) {
7624 CmpSoFar = E;
7625 continue;
7626 }
7627 CmpSoFar = S.CreateBuiltinBinOp(Loc, BO_LAnd, E, CmpSoFar.get());
7628 if (CmpSoFar.isInvalid())
7629 return StmtError();
7630 }
7631 if (FinishCmp())
7632 return StmtError();
7633 std::reverse(Stmts.Stmts.begin(), Stmts.Stmts.end());
7634 // If no such index exists, V is true.
7635 if (RetVal.isUnset())
7636 RetVal = S.ActOnCXXBoolLiteral(Loc, tok::kw_true);
7637 break;
7638 }
7639
7640 case DefaultedComparisonKind::ThreeWay: {
7641 // Per C++2a [class.spaceship]p3, as a fallback add:
7642 // return static_cast<R>(std::strong_ordering::equal);
7643 QualType StrongOrdering = S.CheckComparisonCategoryType(
7644 ComparisonCategoryType::StrongOrdering, Loc,
7645 Sema::ComparisonCategoryUsage::DefaultedOperator);
7646 if (StrongOrdering.isNull())
7647 return StmtError();
7648 VarDecl *EqualVD = S.Context.CompCategories.getInfoForType(StrongOrdering)
7649 .getValueInfo(ComparisonCategoryResult::Equal)
7650 ->VD;
7651 RetVal = getDecl(EqualVD);
7652 if (RetVal.isInvalid())
7653 return StmtError();
7654 RetVal = buildStaticCastToR(RetVal.get());
7655 break;
7656 }
7657
7658 case DefaultedComparisonKind::NotEqual:
7659 case DefaultedComparisonKind::Relational:
7660 RetVal = cast<Expr>(Stmts.Stmts.pop_back_val());
7661 break;
7662 }
7663
7664 // Build the final return statement.
7665 if (RetVal.isInvalid())
7666 return StmtError();
7667 StmtResult ReturnStmt = S.BuildReturnStmt(Loc, RetVal.get());
7668 if (ReturnStmt.isInvalid())
7669 return StmtError();
7670 Stmts.Stmts.push_back(ReturnStmt.get());
7671
7672 return S.ActOnCompoundStmt(Loc, Loc, Stmts.Stmts, /*IsStmtExpr=*/false);
7673 }
7674
7675 private:
7676 ExprResult getDecl(ValueDecl *VD) {
7677 return S.BuildDeclarationNameExpr(
7678 CXXScopeSpec(), DeclarationNameInfo(VD->getDeclName(), Loc), VD);
7679 }
7680
7681 ExprResult getParam(unsigned I) {
7682 ParmVarDecl *PD = FD->getParamDecl(I);
7683 return getDecl(PD);
7684 }
7685
7686 ExprPair getCompleteObject() {
7687 unsigned Param = 0;
7688 ExprResult LHS;
7689 if (isa<CXXMethodDecl>(FD)) {
7690 // LHS is '*this'.
7691 LHS = S.ActOnCXXThis(Loc);
7692 if (!LHS.isInvalid())
7693 LHS = S.CreateBuiltinUnaryOp(Loc, UO_Deref, LHS.get());
7694 } else {
7695 LHS = getParam(Param++);
7696 }
7697 ExprResult RHS = getParam(Param++);
7698 assert(Param == FD->getNumParams());
7699 return {LHS, RHS};
7700 }
7701
7702 ExprPair getBase(CXXBaseSpecifier *Base) {
7703 ExprPair Obj = getCompleteObject();
7704 if (Obj.first.isInvalid() || Obj.second.isInvalid())
7705 return {ExprError(), ExprError()};
7706 CXXCastPath Path = {Base};
7707 return {S.ImpCastExprToType(Obj.first.get(), Base->getType(),
7708 CK_DerivedToBase, VK_LValue, &Path),
7709 S.ImpCastExprToType(Obj.second.get(), Base->getType(),
7710 CK_DerivedToBase, VK_LValue, &Path)};
7711 }
7712
7713 ExprPair getField(FieldDecl *Field) {
7714 ExprPair Obj = getCompleteObject();
7715 if (Obj.first.isInvalid() || Obj.second.isInvalid())
7716 return {ExprError(), ExprError()};
7717
7718 DeclAccessPair Found = DeclAccessPair::make(Field, Field->getAccess());
7719 DeclarationNameInfo NameInfo(Field->getDeclName(), Loc);
7720 return {S.BuildFieldReferenceExpr(Obj.first.get(), /*IsArrow=*/false, Loc,
7721 CXXScopeSpec(), Field, Found, NameInfo),
7722 S.BuildFieldReferenceExpr(Obj.second.get(), /*IsArrow=*/false, Loc,
7723 CXXScopeSpec(), Field, Found, NameInfo)};
7724 }
7725
7726 // FIXME: When expanding a subobject, register a note in the code synthesis
7727 // stack to say which subobject we're comparing.
7728
7729 StmtResult buildIfNotCondReturnFalse(ExprResult Cond) {
7730 if (Cond.isInvalid())
7731 return StmtError();
7732
7733 ExprResult NotCond = S.CreateBuiltinUnaryOp(Loc, UO_LNot, Cond.get());
7734 if (NotCond.isInvalid())
7735 return StmtError();
7736
7737 ExprResult False = S.ActOnCXXBoolLiteral(Loc, tok::kw_false);
7738 assert(!False.isInvalid() && "should never fail");
7739 StmtResult ReturnFalse = S.BuildReturnStmt(Loc, False.get());
7740 if (ReturnFalse.isInvalid())
7741 return StmtError();
7742
7743 return S.ActOnIfStmt(Loc, false, nullptr,
7744 S.ActOnCondition(nullptr, Loc, NotCond.get(),
7745 Sema::ConditionKind::Boolean),
7746 ReturnFalse.get(), SourceLocation(), nullptr);
7747 }
7748
7749 StmtResult visitSubobjectArray(QualType Type, llvm::APInt Size,
7750 ExprPair Subobj) {
7751 QualType SizeType = S.Context.getSizeType();
7752 Size = Size.zextOrTrunc(S.Context.getTypeSize(SizeType));
7753
7754 // Build 'size_t i$n = 0'.
7755 IdentifierInfo *IterationVarName = nullptr;
7756 {
7757 SmallString<8> Str;
7758 llvm::raw_svector_ostream OS(Str);
7759 OS << "i" << ArrayDepth;
7760 IterationVarName = &S.Context.Idents.get(OS.str());
7761 }
7762 VarDecl *IterationVar = VarDecl::Create(
7763 S.Context, S.CurContext, Loc, Loc, IterationVarName, SizeType,
7764 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), SC_None);
7765 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0);
7766 IterationVar->setInit(
7767 IntegerLiteral::Create(S.Context, Zero, SizeType, Loc));
7768 Stmt *Init = new (S.Context) DeclStmt(DeclGroupRef(IterationVar), Loc, Loc);
7769
7770 auto IterRef = [&] {
7771 ExprResult Ref = S.BuildDeclarationNameExpr(
7772 CXXScopeSpec(), DeclarationNameInfo(IterationVarName, Loc),
7773 IterationVar);
7774 assert(!Ref.isInvalid() && "can't reference our own variable?");
7775 return Ref.get();
7776 };
7777
7778 // Build 'i$n != Size'.
7779 ExprResult Cond = S.CreateBuiltinBinOp(
7780 Loc, BO_NE, IterRef(),
7781 IntegerLiteral::Create(S.Context, Size, SizeType, Loc));
7782 assert(!Cond.isInvalid() && "should never fail");
7783
7784 // Build '++i$n'.
7785 ExprResult Inc = S.CreateBuiltinUnaryOp(Loc, UO_PreInc, IterRef());
7786 assert(!Inc.isInvalid() && "should never fail");
7787
7788 // Build 'a[i$n]' and 'b[i$n]'.
7789 auto Index = [&](ExprResult E) {
7790 if (E.isInvalid())
7791 return ExprError();
7792 return S.CreateBuiltinArraySubscriptExpr(E.get(), Loc, IterRef(), Loc);
7793 };
7794 Subobj.first = Index(Subobj.first);
7795 Subobj.second = Index(Subobj.second);
7796
7797 // Compare the array elements.
7798 ++ArrayDepth;
7799 StmtResult Substmt = visitSubobject(Type, Subobj);
7800 --ArrayDepth;
7801
7802 if (Substmt.isInvalid())
7803 return StmtError();
7804
7805 // For the inner level of an 'operator==', build 'if (!cmp) return false;'.
7806 // For outer levels or for an 'operator<=>' we already have a suitable
7807 // statement that returns as necessary.
7808 if (Expr *ElemCmp = dyn_cast<Expr>(Substmt.get())) {
7809 assert(DCK == DefaultedComparisonKind::Equal &&
7810 "should have non-expression statement");
7811 Substmt = buildIfNotCondReturnFalse(ElemCmp);
7812 if (Substmt.isInvalid())
7813 return StmtError();
7814 }
7815
7816 // Build 'for (...) ...'
7817 return S.ActOnForStmt(Loc, Loc, Init,
7818 S.ActOnCondition(nullptr, Loc, Cond.get(),
7819 Sema::ConditionKind::Boolean),
7820 S.MakeFullDiscardedValueExpr(Inc.get()), Loc,
7821 Substmt.get());
7822 }
7823
7824 StmtResult visitExpandedSubobject(QualType Type, ExprPair Obj) {
7825 if (Obj.first.isInvalid() || Obj.second.isInvalid())
7826 return StmtError();
7827
7828 OverloadedOperatorKind OO = FD->getOverloadedOperator();
7829 ExprResult Op = S.CreateOverloadedBinOp(
7830 Loc, BinaryOperator::getOverloadedOpcode(OO), Fns,
7831 Obj.first.get(), Obj.second.get(), /*PerformADL=*/true,
7832 /*AllowRewrittenCandidates=*/true, FD);
7833 if (Op.isInvalid())
7834 return StmtError();
7835
7836 switch (DCK) {
7837 case DefaultedComparisonKind::None:
7838 llvm_unreachable("not a defaulted comparison");
7839
7840 case DefaultedComparisonKind::Equal:
7841 // Per C++2a [class.eq]p2, each comparison is individually contextually
7842 // converted to bool.
7843 Op = S.PerformContextuallyConvertToBool(Op.get());
7844 if (Op.isInvalid())
7845 return StmtError();
7846 return Op.get();
7847
7848 case DefaultedComparisonKind::ThreeWay: {
7849 // Per C++2a [class.spaceship]p3, form:
7850 // if (R cmp = static_cast<R>(op); cmp != 0)
7851 // return cmp;
7852 QualType R = FD->getReturnType();
7853 Op = buildStaticCastToR(Op.get());
7854 if (Op.isInvalid())
7855 return StmtError();
7856
7857 // R cmp = ...;
7858 IdentifierInfo *Name = &S.Context.Idents.get("cmp");
7859 VarDecl *VD =
7860 VarDecl::Create(S.Context, S.CurContext, Loc, Loc, Name, R,
7861 S.Context.getTrivialTypeSourceInfo(R, Loc), SC_None);
7862 S.AddInitializerToDecl(VD, Op.get(), /*DirectInit=*/false);
7863 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(VD), Loc, Loc);
7864
7865 // cmp != 0
7866 ExprResult VDRef = getDecl(VD);
7867 if (VDRef.isInvalid())
7868 return StmtError();
7869 llvm::APInt ZeroVal(S.Context.getIntWidth(S.Context.IntTy), 0);
7870 Expr *Zero =
7871 IntegerLiteral::Create(S.Context, ZeroVal, S.Context.IntTy, Loc);
7872 ExprResult Comp = S.CreateOverloadedBinOp(Loc, BO_NE, Fns, VDRef.get(),
7873 Zero, true, true, FD);
7874 if (Comp.isInvalid())
7875 return StmtError();
7876 Sema::ConditionResult Cond = S.ActOnCondition(
7877 nullptr, Loc, Comp.get(), Sema::ConditionKind::Boolean);
7878 if (Cond.isInvalid())
7879 return StmtError();
7880
7881 // return cmp;
7882 VDRef = getDecl(VD);
7883 if (VDRef.isInvalid())
7884 return StmtError();
7885 StmtResult ReturnStmt = S.BuildReturnStmt(Loc, VDRef.get());
7886 if (ReturnStmt.isInvalid())
7887 return StmtError();
7888
7889 // if (...)
7890 return S.ActOnIfStmt(Loc, /*IsConstexpr=*/false, InitStmt, Cond,
7891 ReturnStmt.get(), /*ElseLoc=*/SourceLocation(),
7892 /*Else=*/nullptr);
7893 }
7894
7895 case DefaultedComparisonKind::NotEqual:
7896 case DefaultedComparisonKind::Relational:
7897 // C++2a [class.compare.secondary]p2:
7898 // Otherwise, the operator function yields x @ y.
7899 return Op.get();
7900 }
7901 llvm_unreachable("");
7902 }
7903
7904 /// Build "static_cast<R>(E)".
7905 ExprResult buildStaticCastToR(Expr *E) {
7906 QualType R = FD->getReturnType();
7907 assert(!R->isUndeducedType() && "type should have been deduced already");
7908
7909 // Don't bother forming a no-op cast in the common case.
7910 if (E->isRValue() && S.Context.hasSameType(E->getType(), R))
7911 return E;
7912 return S.BuildCXXNamedCast(Loc, tok::kw_static_cast,
7913 S.Context.getTrivialTypeSourceInfo(R, Loc), E,
7914 SourceRange(Loc, Loc), SourceRange(Loc, Loc));
7915 }
7916 };
7917 }
7918
7919 /// Perform the unqualified lookups that might be needed to form a defaulted
7920 /// comparison function for the given operator.
7921 static void lookupOperatorsForDefaultedComparison(Sema &Self, Scope *S,
7922 UnresolvedSetImpl &Operators,
7923 OverloadedOperatorKind Op) {
7924 auto Lookup = [&](OverloadedOperatorKind OO) {
7925 Self.LookupOverloadedOperatorName(OO, S, QualType(), QualType(), Operators);
7926 };
7927
7928 // Every defaulted operator looks up itself.
7929 Lookup(Op);
7930 // ... and the rewritten form of itself, if any.
7931 if (OverloadedOperatorKind ExtraOp = getRewrittenOverloadedOperator(Op))
7932 Lookup(ExtraOp);
7933
7934 // For 'operator<=>', we also form a 'cmp != 0' expression, and might
7935 // synthesize a three-way comparison from '<' and '=='. In a dependent
7936 // context, we also need to look up '==' in case we implicitly declare a
7937 // defaulted 'operator=='.
7938 if (Op == OO_Spaceship) {
7939 Lookup(OO_ExclaimEqual);
7940 Lookup(OO_Less);
7941 Lookup(OO_EqualEqual);
7942 }
7943 }
7944
7945 bool Sema::CheckExplicitlyDefaultedComparison(Scope *S, FunctionDecl *FD,
7946 DefaultedComparisonKind DCK) {
7947 assert(DCK != DefaultedComparisonKind::None && "not a defaulted comparison");
7948
7949 CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(FD->getLexicalDeclContext());
7950 assert(RD && "defaulted comparison is not defaulted in a class");
7951
7952 // Perform any unqualified lookups we're going to need to default this
7953 // function.
7954 if (S) {
7955 UnresolvedSet<32> Operators;
7956 lookupOperatorsForDefaultedComparison(*this, S, Operators,
7957 FD->getOverloadedOperator());
7958 FD->setDefaultedFunctionInfo(FunctionDecl::DefaultedFunctionInfo::Create(
7959 Context, Operators.pairs()));
7960 }
7961
7962 // C++2a [class.compare.default]p1:
7963 // A defaulted comparison operator function for some class C shall be a
7964 // non-template function declared in the member-specification of C that is
7965 // -- a non-static const member of C having one parameter of type
7966 // const C&, or
7967 // -- a friend of C having two parameters of type const C& or two
7968 // parameters of type C.
7969 QualType ExpectedParmType1 = Context.getRecordType(RD);
7970 QualType ExpectedParmType2 =
7971 Context.getLValueReferenceType(ExpectedParmType1.withConst());
7972 if (isa<CXXMethodDecl>(FD))
7973 ExpectedParmType1 = ExpectedParmType2;
7974 for (const ParmVarDecl *Param : FD->parameters()) {
7975 if (!Param->getType()->isDependentType() &&
7976 !Context.hasSameType(Param->getType(), ExpectedParmType1) &&
7977 !Context.hasSameType(Param->getType(), ExpectedParmType2)) {
7978 // Don't diagnose an implicit 'operator=='; we will have diagnosed the
7979 // corresponding defaulted 'operator<=>' already.
7980 if (!FD->isImplicit()) {
7981 Diag(FD->getLocation(), diag::err_defaulted_comparison_param)
7982 << (int)DCK << Param->getType() << ExpectedParmType1
7983 << !isa<CXXMethodDecl>(FD)
7984 << ExpectedParmType2 << Param->getSourceRange();
7985 }
7986 return true;
7987 }
7988 }
7989 if (FD->getNumParams() == 2 &&
7990 !Context.hasSameType(FD->getParamDecl(0)->getType(),
7991 FD->getParamDecl(1)->getType())) {
7992 if (!FD->isImplicit()) {
7993 Diag(FD->getLocation(), diag::err_defaulted_comparison_param_mismatch)
7994 << (int)DCK
7995 << FD->getParamDecl(0)->getType()
7996 << FD->getParamDecl(0)->getSourceRange()
7997 << FD->getParamDecl(1)->getType()
7998 << FD->getParamDecl(1)->getSourceRange();
7999 }
8000 return true;
8001 }
8002
8003 // ... non-static const member ...
8004 if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) {
8005 assert(!MD->isStatic() && "comparison function cannot be a static member");
8006 if (!MD->isConst()) {
8007 SourceLocation InsertLoc;
8008 if (FunctionTypeLoc Loc = MD->getFunctionTypeLoc())
8009 InsertLoc = getLocForEndOfToken(Loc.getRParenLoc());
8010 // Don't diagnose an implicit 'operator=='; we will have diagnosed the
8011 // corresponding defaulted 'operator<=>' already.
8012 if (!MD->isImplicit()) {
8013 Diag(MD->getLocation(), diag::err_defaulted_comparison_non_const)
8014 << (int)DCK << FixItHint::CreateInsertion(InsertLoc, " const");
8015 }
8016
8017 // Add the 'const' to the type to recover.
8018 const auto *FPT = MD->getType()->castAs<FunctionProtoType>();
8019 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
8020 EPI.TypeQuals.addConst();
8021 MD->setType(Context.getFunctionType(FPT->getReturnType(),
8022 FPT->getParamTypes(), EPI));
8023 }
8024 } else {
8025 // A non-member function declared in a class must be a friend.
8026 assert(FD->getFriendObjectKind() && "expected a friend declaration");
8027 }
8028
8029 // C++2a [class.eq]p1, [class.rel]p1:
8030 // A [defaulted comparison other than <=>] shall have a declared return
8031 // type bool.
8032 if (DCK != DefaultedComparisonKind::ThreeWay &&
8033 !FD->getDeclaredReturnType()->isDependentType() &&
8034 !Context.hasSameType(FD->getDeclaredReturnType(), Context.BoolTy)) {
8035 Diag(FD->getLocation(), diag::err_defaulted_comparison_return_type_not_bool)
8036 << (int)DCK << FD->getDeclaredReturnType() << Context.BoolTy
8037 << FD->getReturnTypeSourceRange();
8038 return true;
8039 }
8040 // C++2a [class.spaceship]p2 [P2002R0]:
8041 // Let R be the declared return type [...]. If R is auto, [...]. Otherwise,
8042 // R shall not contain a placeholder type.
8043 if (DCK == DefaultedComparisonKind::ThreeWay &&
8044 FD->getDeclaredReturnType()->getContainedDeducedType() &&
8045 !Context.hasSameType(FD->getDeclaredReturnType(),
8046 Context.getAutoDeductType())) {
8047 Diag(FD->getLocation(),
8048 diag::err_defaulted_comparison_deduced_return_type_not_auto)
8049 << (int)DCK << FD->getDeclaredReturnType() << Context.AutoDeductTy
8050 << FD->getReturnTypeSourceRange();
8051 return true;
8052 }
8053
8054 // For a defaulted function in a dependent class, defer all remaining checks
8055 // until instantiation.
8056 if (RD->isDependentType())
8057 return false;
8058
8059 // Determine whether the function should be defined as deleted.
8060 DefaultedComparisonInfo Info =
8061 DefaultedComparisonAnalyzer(*this, RD, FD, DCK).visit();
8062
8063 bool First = FD == FD->getCanonicalDecl();
8064
8065 // If we want to delete the function, then do so; there's nothing else to
8066 // check in that case.
8067 if (Info.Deleted) {
8068 if (!First) {
8069 // C++11 [dcl.fct.def.default]p4:
8070 // [For a] user-provided explicitly-defaulted function [...] if such a
8071 // function is implicitly defined as deleted, the program is ill-formed.
8072 //
8073 // This is really just a consequence of the general rule that you can
8074 // only delete a function on its first declaration.
8075 Diag(FD->getLocation(), diag::err_non_first_default_compare_deletes)
8076 << FD->isImplicit() << (int)DCK;
8077 DefaultedComparisonAnalyzer(*this, RD, FD, DCK,
8078 DefaultedComparisonAnalyzer::ExplainDeleted)
8079 .visit();
8080 return true;
8081 }
8082
8083 SetDeclDeleted(FD, FD->getLocation());
8084 if (!inTemplateInstantiation() && !FD->isImplicit()) {
8085 Diag(FD->getLocation(), diag::warn_defaulted_comparison_deleted)
8086 << (int)DCK;
8087 DefaultedComparisonAnalyzer(*this, RD, FD, DCK,
8088 DefaultedComparisonAnalyzer::ExplainDeleted)
8089 .visit();
8090 }
8091 return false;
8092 }
8093
8094 // C++2a [class.spaceship]p2:
8095 // The return type is deduced as the common comparison type of R0, R1, ...
8096 if (DCK == DefaultedComparisonKind::ThreeWay &&
8097 FD->getDeclaredReturnType()->isUndeducedAutoType()) {
8098 SourceLocation RetLoc = FD->getReturnTypeSourceRange().getBegin();
8099 if (RetLoc.isInvalid())
8100 RetLoc = FD->getBeginLoc();
8101 // FIXME: Should we really care whether we have the complete type and the
8102 // 'enumerator' constants here? A forward declaration seems sufficient.
8103 QualType Cat = CheckComparisonCategoryType(
8104 Info.Category, RetLoc, ComparisonCategoryUsage::DefaultedOperator);
8105 if (Cat.isNull())
8106 return true;
8107 Context.adjustDeducedFunctionResultType(
8108 FD, SubstAutoType(FD->getDeclaredReturnType(), Cat));
8109 }
8110
8111 // C++2a [dcl.fct.def.default]p3 [P2002R0]:
8112 // An explicitly-defaulted function that is not defined as deleted may be
8113 // declared constexpr or consteval only if it is constexpr-compatible.
8114 // C++2a [class.compare.default]p3 [P2002R0]:
8115 // A defaulted comparison function is constexpr-compatible if it satisfies
8116 // the requirements for a constexpr function [...]
8117 // The only relevant requirements are that the parameter and return types are
8118 // literal types. The remaining conditions are checked by the analyzer.
8119 if (FD->isConstexpr()) {
8120 if (CheckConstexprReturnType(*this, FD, CheckConstexprKind::Diagnose) &&
8121 CheckConstexprParameterTypes(*this, FD, CheckConstexprKind::Diagnose) &&
8122 !Info.Constexpr) {
8123 Diag(FD->getBeginLoc(),
8124 diag::err_incorrect_defaulted_comparison_constexpr)
8125 << FD->isImplicit() << (int)DCK << FD->isConsteval();
8126 DefaultedComparisonAnalyzer(*this, RD, FD, DCK,
8127 DefaultedComparisonAnalyzer::ExplainConstexpr)
8128 .visit();
8129 }
8130 }
8131
8132 // C++2a [dcl.fct.def.default]p3 [P2002R0]:
8133 // If a constexpr-compatible function is explicitly defaulted on its first
8134 // declaration, it is implicitly considered to be constexpr.
8135 // FIXME: Only applying this to the first declaration seems problematic, as
8136 // simple reorderings can affect the meaning of the program.
8137 if (First && !FD->isConstexpr() && Info.Constexpr)
8138 FD->setConstexprKind(CSK_constexpr);
8139
8140 // C++2a [except.spec]p3:
8141 // If a declaration of a function does not have a noexcept-specifier
8142 // [and] is defaulted on its first declaration, [...] the exception
8143 // specification is as specified below
8144 if (FD->getExceptionSpecType() == EST_None) {
8145 auto *FPT = FD->getType()->castAs<FunctionProtoType>();
8146 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
8147 EPI.ExceptionSpec.Type = EST_Unevaluated;
8148 EPI.ExceptionSpec.SourceDecl = FD;
8149 FD->setType(Context.getFunctionType(FPT->getReturnType(),
8150 FPT->getParamTypes(), EPI));
8151 }
8152
8153 return false;
8154 }
8155
8156 void Sema::DeclareImplicitEqualityComparison(CXXRecordDecl *RD,
8157 FunctionDecl *Spaceship) {
8158 Sema::CodeSynthesisContext Ctx;
8159 Ctx.Kind = Sema::CodeSynthesisContext::DeclaringImplicitEqualityComparison;
8160 Ctx.PointOfInstantiation = Spaceship->getEndLoc();
8161 Ctx.Entity = Spaceship;
8162 pushCodeSynthesisContext(Ctx);
8163
8164 if (FunctionDecl *EqualEqual = SubstSpaceshipAsEqualEqual(RD, Spaceship))
8165 EqualEqual->setImplicit();
8166
8167 popCodeSynthesisContext();
8168 }
8169
8170 void Sema::DefineDefaultedComparison(SourceLocation UseLoc, FunctionDecl *FD,
8171 DefaultedComparisonKind DCK) {
8172 assert(FD->isDefaulted() && !FD->isDeleted() &&
8173 !FD->doesThisDeclarationHaveABody());
8174 if (FD->willHaveBody() || FD->isInvalidDecl())
8175 return;
8176
8177 SynthesizedFunctionScope Scope(*this, FD);
8178
8179 // Add a context note for diagnostics produced after this point.
8180 Scope.addContextNote(UseLoc);
8181
8182 {
8183 // Build and set up the function body.
8184 CXXRecordDecl *RD = cast<CXXRecordDecl>(FD->getLexicalParent());
8185 SourceLocation BodyLoc =
8186 FD->getEndLoc().isValid() ? FD->getEndLoc() : FD->getLocation();
8187 StmtResult Body =
8188 DefaultedComparisonSynthesizer(*this, RD, FD, DCK, BodyLoc).build();
8189 if (Body.isInvalid()) {
8190 FD->setInvalidDecl();
8191 return;
8192 }
8193 FD->setBody(Body.get());
8194 FD->markUsed(Context);
8195 }
8196
8197 // The exception specification is needed because we are defining the
8198 // function. Note that this will reuse the body we just built.
8199 ResolveExceptionSpec(UseLoc, FD->getType()->castAs<FunctionProtoType>());
8200
8201 if (ASTMutationListener *L = getASTMutationListener())
8202 L->CompletedImplicitDefinition(FD);
8203 }
8204
8205 static Sema::ImplicitExceptionSpecification
8206 ComputeDefaultedComparisonExceptionSpec(Sema &S, SourceLocation Loc,
8207 FunctionDecl *FD,
8208 Sema::DefaultedComparisonKind DCK) {
8209 ComputingExceptionSpec CES(S, FD, Loc);
8210 Sema::ImplicitExceptionSpecification ExceptSpec(S);
8211
8212 if (FD->isInvalidDecl())
8213 return ExceptSpec;
8214
8215 // The common case is that we just defined the comparison function. In that
8216 // case, just look at whether the body can throw.
8217 if (FD->hasBody()) {
8218 ExceptSpec.CalledStmt(FD->getBody());
8219 } else {
8220 // Otherwise, build a body so we can check it. This should ideally only
8221 // happen when we're not actually marking the function referenced. (This is
8222 // only really important for efficiency: we don't want to build and throw
8223 // away bodies for comparison functions more than we strictly need to.)
8224
8225 // Pretend to synthesize the function body in an unevaluated context.
8226 // Note that we can't actually just go ahead and define the function here:
8227 // we are not permitted to mark its callees as referenced.
8228 Sema::SynthesizedFunctionScope Scope(S, FD);
8229 EnterExpressionEvaluationContext Context(
8230 S, Sema::ExpressionEvaluationContext::Unevaluated);
8231
8232 CXXRecordDecl *RD = cast<CXXRecordDecl>(FD->getLexicalParent());
8233 SourceLocation BodyLoc =
8234 FD->getEndLoc().isValid() ? FD->getEndLoc() : FD->getLocation();
8235 StmtResult Body =
8236 DefaultedComparisonSynthesizer(S, RD, FD, DCK, BodyLoc).build();
8237 if (!Body.isInvalid())
8238 ExceptSpec.CalledStmt(Body.get());
8239
8240 // FIXME: Can we hold onto this body and just transform it to potentially
8241 // evaluated when we're asked to define the function rather than rebuilding
8242 // it? Either that, or we should only build the bits of the body that we
8243 // need (the expressions, not the statements).
8244 }
8245
8246 return ExceptSpec;
8247 }
8248
8249 void Sema::CheckDelayedMemberExceptionSpecs() {
8250 decltype(DelayedOverridingExceptionSpecChecks) Overriding;
8251 decltype(DelayedEquivalentExceptionSpecChecks) Equivalent;
8252
8253 std::swap(Overriding, DelayedOverridingExceptionSpecChecks);
8254 std::swap(Equivalent, DelayedEquivalentExceptionSpecChecks);
8255
8256 // Perform any deferred checking of exception specifications for virtual
8257 // destructors.
8258 for (auto &Check : Overriding)
8259 CheckOverridingFunctionExceptionSpec(Check.first, Check.second);
8260
8261 // Perform any deferred checking of exception specifications for befriended
8262 // special members.
8263 for (auto &Check : Equivalent)
8264 CheckEquivalentExceptionSpec(Check.second, Check.first);
8265 }
8266
8267 namespace {
8268 /// CRTP base class for visiting operations performed by a special member
8269 /// function (or inherited constructor).
8270 template<typename Derived>
8271 struct SpecialMemberVisitor {
8272 Sema &S;
8273 CXXMethodDecl *MD;
8274 Sema::CXXSpecialMember CSM;
8275 Sema::InheritedConstructorInfo *ICI;
8276
8277 // Properties of the special member, computed for convenience.
8278 bool IsConstructor = false, IsAssignment = false, ConstArg = false;
8279
8280 SpecialMemberVisitor(Sema &S, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM,
8281 Sema::InheritedConstructorInfo *ICI)
8282 : S(S), MD(MD), CSM(CSM), ICI(ICI) {
8283 switch (CSM) {
8284 case Sema::CXXDefaultConstructor:
8285 case Sema::CXXCopyConstructor:
8286 case Sema::CXXMoveConstructor:
8287 IsConstructor = true;
8288 break;
8289 case Sema::CXXCopyAssignment:
8290 case Sema::CXXMoveAssignment:
8291 IsAssignment = true;
8292 break;
8293 case Sema::CXXDestructor:
8294 break;
8295 case Sema::CXXInvalid:
8296 llvm_unreachable("invalid special member kind");
8297 }
8298
8299 if (MD->getNumParams()) {
8300 if (const ReferenceType *RT =
8301 MD->getParamDecl(0)->getType()->getAs<ReferenceType>())
8302 ConstArg = RT->getPointeeType().isConstQualified();
8303 }
8304 }
8305
8306 Derived &getDerived() { return static_cast<Derived&>(*this); }
8307
8308 /// Is this a "move" special member?
8309 bool isMove() const {
8310 return CSM == Sema::CXXMoveConstructor || CSM == Sema::CXXMoveAssignment;
8311 }
8312
8313 /// Look up the corresponding special member in the given class.
8314 Sema::SpecialMemberOverloadResult lookupIn(CXXRecordDecl *Class,
8315 unsigned Quals, bool IsMutable) {
8316 return lookupCallFromSpecialMember(S, Class, CSM, Quals,
8317 ConstArg && !IsMutable);
8318 }
8319
8320 /// Look up the constructor for the specified base class to see if it's
8321 /// overridden due to this being an inherited constructor.
8322 Sema::SpecialMemberOverloadResult lookupInheritedCtor(CXXRecordDecl *Class) {
8323 if (!ICI)
8324 return {};
8325 assert(CSM == Sema::CXXDefaultConstructor);
8326 auto *BaseCtor =
8327 cast<CXXConstructorDecl>(MD)->getInheritedConstructor().getConstructor();
8328 if (auto *MD = ICI->findConstructorForBase(Class, BaseCtor).first)
8329 return MD;
8330 return {};
8331 }
8332
8333 /// A base or member subobject.
8334 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject;
8335
8336 /// Get the location to use for a subobject in diagnostics.
8337 static SourceLocation getSubobjectLoc(Subobject Subobj) {
8338 // FIXME: For an indirect virtual base, the direct base leading to
8339 // the indirect virtual base would be a more useful choice.
8340 if (auto *B = Subobj.dyn_cast<CXXBaseSpecifier*>())
8341 return B->getBaseTypeLoc();
8342 else
8343 return Subobj.get<FieldDecl*>()->getLocation();
8344 }
8345
8346 enum BasesToVisit {
8347 /// Visit all non-virtual (direct) bases.
8348 VisitNonVirtualBases,
8349 /// Visit all direct bases, virtual or not.
8350 VisitDirectBases,
8351 /// Visit all non-virtual bases, and all virtual bases if the class
8352 /// is not abstract.
8353 VisitPotentiallyConstructedBases,
8354 /// Visit all direct or virtual bases.
8355 VisitAllBases
8356 };
8357
8358 // Visit the bases and members of the class.
8359 bool visit(BasesToVisit Bases) {
8360 CXXRecordDecl *RD = MD->getParent();
8361
8362 if (Bases == VisitPotentiallyConstructedBases)
8363 Bases = RD->isAbstract() ? VisitNonVirtualBases : VisitAllBases;
8364
8365 for (auto &B : RD->bases())
8366 if ((Bases == VisitDirectBases || !B.isVirtual()) &&
8367 getDerived().visitBase(&B))
8368 return true;
8369
8370 if (Bases == VisitAllBases)
8371 for (auto &B : RD->vbases())
8372 if (getDerived().visitBase(&B))
8373 return true;
8374
8375 for (auto *F : RD->fields())
8376 if (!F->isInvalidDecl() && !F->isUnnamedBitfield() &&
8377 getDerived().visitField(F))
8378 return true;
8379
8380 return false;
8381 }
8382 };
8383 }
8384
8385 namespace {
8386 struct SpecialMemberDeletionInfo
8387 : SpecialMemberVisitor<SpecialMemberDeletionInfo> {
8388 bool Diagnose;
8389
8390 SourceLocation Loc;
8391
8392 bool AllFieldsAreConst;
8393
8394 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD,
8395 Sema::CXXSpecialMember CSM,
8396 Sema::InheritedConstructorInfo *ICI, bool Diagnose)
8397 : SpecialMemberVisitor(S, MD, CSM, ICI), Diagnose(Diagnose),
8398 Loc(MD->getLocation()), AllFieldsAreConst(true) {}
8399
8400 bool inUnion() const { return MD->getParent()->isUnion(); }
8401
8402 Sema::CXXSpecialMember getEffectiveCSM() {
8403 return ICI ? Sema::CXXInvalid : CSM;
8404 }
8405
8406 bool shouldDeleteForVariantObjCPtrMember(FieldDecl *FD, QualType FieldType);
8407
8408 bool visitBase(CXXBaseSpecifier *Base) { return shouldDeleteForBase(Base); }
8409 bool visitField(FieldDecl *Field) { return shouldDeleteForField(Field); }
8410
8411 bool shouldDeleteForBase(CXXBaseSpecifier *Base);
8412 bool shouldDeleteForField(FieldDecl *FD);
8413 bool shouldDeleteForAllConstMembers();
8414
8415 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj,
8416 unsigned Quals);
8417 bool shouldDeleteForSubobjectCall(Subobject Subobj,
8418 Sema::SpecialMemberOverloadResult SMOR,
8419 bool IsDtorCallInCtor);
8420
8421 bool isAccessible(Subobject Subobj, CXXMethodDecl *D);
8422 };
8423 }
8424
8425 /// Is the given special member inaccessible when used on the given
8426 /// sub-object.
8427 bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj,
8428 CXXMethodDecl *target) {
8429 /// If we're operating on a base class, the object type is the
8430 /// type of this special member.
8431 QualType objectTy;
8432 AccessSpecifier access = target->getAccess();
8433 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) {
8434 objectTy = S.Context.getTypeDeclType(MD->getParent());
8435 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access);
8436
8437 // If we're operating on a field, the object type is the type of the field.
8438 } else {
8439 objectTy = S.Context.getTypeDeclType(target->getParent());
8440 }
8441
8442 return S.isMemberAccessibleForDeletion(
8443 target->getParent(), DeclAccessPair::make(target, access), objectTy);
8444 }
8445
8446 /// Check whether we should delete a special member due to the implicit
8447 /// definition containing a call to a special member of a subobject.
8448 bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall(
8449 Subobject Subobj, Sema::SpecialMemberOverloadResult SMOR,
8450 bool IsDtorCallInCtor) {
8451 CXXMethodDecl *Decl = SMOR.getMethod();
8452 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
8453
8454 int DiagKind = -1;
8455
8456 if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted)
8457 DiagKind = !Decl ? 0 : 1;
8458 else if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::Ambiguous)
8459 DiagKind = 2;
8460 else if (!isAccessible(Subobj, Decl))
8461 DiagKind = 3;
8462 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() &&
8463 !Decl->isTrivial()) {
8464 // A member of a union must have a trivial corresponding special member.
8465 // As a weird special case, a destructor call from a union's constructor
8466 // must be accessible and non-deleted, but need not be trivial. Such a
8467 // destructor is never actually called, but is semantically checked as
8468 // if it were.
8469 DiagKind = 4;
8470 }
8471
8472 if (DiagKind == -1)
8473 return false;
8474
8475 if (Diagnose) {
8476 if (Field) {
8477 S.Diag(Field->getLocation(),
8478 diag::note_deleted_special_member_class_subobject)
8479 << getEffectiveCSM() << MD->getParent() << /*IsField*/true
8480 << Field << DiagKind << IsDtorCallInCtor << /*IsObjCPtr*/false;
8481 } else {
8482 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>();
8483 S.Diag(Base->getBeginLoc(),
8484 diag::note_deleted_special_member_class_subobject)
8485 << getEffectiveCSM() << MD->getParent() << /*IsField*/ false
8486 << Base->getType() << DiagKind << IsDtorCallInCtor
8487 << /*IsObjCPtr*/false;
8488 }
8489
8490 if (DiagKind == 1)
8491 S.NoteDeletedFunction(Decl);
8492 // FIXME: Explain inaccessibility if DiagKind == 3.
8493 }
8494
8495 return true;
8496 }
8497
8498 /// Check whether we should delete a special member function due to having a
8499 /// direct or virtual base class or non-static data member of class type M.
8500 bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject(
8501 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) {
8502 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
8503 bool IsMutable = Field && Field->isMutable();
8504
8505 // C++11 [class.ctor]p5:
8506 // -- any direct or virtual base class, or non-static data member with no
8507 // brace-or-equal-initializer, has class type M (or array thereof) and
8508 // either M has no default constructor or overload resolution as applied
8509 // to M's default constructor results in an ambiguity or in a function
8510 // that is deleted or inaccessible
8511 // C++11 [class.copy]p11, C++11 [class.copy]p23:
8512 // -- a direct or virtual base class B that cannot be copied/moved because
8513 // overload resolution, as applied to B's corresponding special member,
8514 // results in an ambiguity or a function that is deleted or inaccessible
8515 // from the defaulted special member
8516 // C++11 [class.dtor]p5:
8517 // -- any direct or virtual base class [...] has a type with a destructor
8518 // that is deleted or inaccessible
8519 if (!(CSM == Sema::CXXDefaultConstructor &&
8520 Field && Field->hasInClassInitializer()) &&
8521 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals, IsMutable),
8522 false))
8523 return true;
8524
8525 // C++11 [class.ctor]p5, C++11 [class.copy]p11:
8526 // -- any direct or virtual base class or non-static data member has a
8527 // type with a destructor that is deleted or inaccessible
8528 if (IsConstructor) {
8529 Sema::SpecialMemberOverloadResult SMOR =
8530 S.LookupSpecialMember(Class, Sema::CXXDestructor,
8531 false, false, false, false, false);
8532 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true))
8533 return true;
8534 }
8535
8536 return false;
8537 }
8538
8539 bool SpecialMemberDeletionInfo::shouldDeleteForVariantObjCPtrMember(
8540 FieldDecl *FD, QualType FieldType) {
8541 // The defaulted special functions are defined as deleted if this is a variant
8542 // member with a non-trivial ownership type, e.g., ObjC __strong or __weak
8543 // type under ARC.
8544 if (!FieldType.hasNonTrivialObjCLifetime())
8545 return false;
8546
8547 // Don't make the defaulted default constructor defined as deleted if the
8548 // member has an in-class initializer.
8549 if (CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer())
8550 return false;
8551
8552 if (Diagnose) {
8553 auto *ParentClass = cast<CXXRecordDecl>(FD->getParent());
8554 S.Diag(FD->getLocation(),
8555 diag::note_deleted_special_member_class_subobject)
8556 << getEffectiveCSM() << ParentClass << /*IsField*/true
8557 << FD << 4 << /*IsDtorCallInCtor*/false << /*IsObjCPtr*/true;
8558 }
8559
8560 return true;
8561 }
8562
8563 /// Check whether we should delete a special member function due to the class
8564 /// having a particular direct or virtual base class.
8565 bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) {
8566 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl();
8567 // If program is correct, BaseClass cannot be null, but if it is, the error
8568 // must be reported elsewhere.
8569 if (!BaseClass)
8570 return false;
8571 // If we have an inheriting constructor, check whether we're calling an
8572 // inherited constructor instead of a default constructor.
8573 Sema::SpecialMemberOverloadResult SMOR = lookupInheritedCtor(BaseClass);
8574 if (auto *BaseCtor = SMOR.getMethod()) {
8575 // Note that we do not check access along this path; other than that,
8576 // this is the same as shouldDeleteForSubobjectCall(Base, BaseCtor, false);
8577 // FIXME: Check that the base has a usable destructor! Sink this into
8578 // shouldDeleteForClassSubobject.
8579 if (BaseCtor->isDeleted() && Diagnose) {
8580 S.Diag(Base->getBeginLoc(),
8581 diag::note_deleted_special_member_class_subobject)
8582 << getEffectiveCSM() << MD->getParent() << /*IsField*/ false
8583 << Base->getType() << /*Deleted*/ 1 << /*IsDtorCallInCtor*/ false
8584 << /*IsObjCPtr*/false;
8585 S.NoteDeletedFunction(BaseCtor);
8586 }
8587 return BaseCtor->isDeleted();
8588 }
8589 return shouldDeleteForClassSubobject(BaseClass, Base, 0);
8590 }
8591
8592 /// Check whether we should delete a special member function due to the class
8593 /// having a particular non-static data member.
8594 bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) {
8595 QualType FieldType = S.Context.getBaseElementType(FD->getType());
8596 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl();
8597
8598 if (inUnion() && shouldDeleteForVariantObjCPtrMember(FD, FieldType))
8599 return true;
8600
8601 if (CSM == Sema::CXXDefaultConstructor) {
8602 // For a default constructor, all references must be initialized in-class
8603 // and, if a union, it must have a non-const member.
8604 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) {
8605 if (Diagnose)
8606 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
8607 << !!ICI << MD->getParent() << FD << FieldType << /*Reference*/0;
8608 return true;
8609 }
8610 // C++11 [class.ctor]p5: any non-variant non-static data member of
8611 // const-qualified type (or array thereof) with no
8612 // brace-or-equal-initializer does not have a user-provided default
8613 // constructor.
8614 if (!inUnion() && FieldType.isConstQualified() &&
8615 !FD->hasInClassInitializer() &&
8616 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) {
8617 if (Diagnose)
8618 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
8619 << !!ICI << MD->getParent() << FD << FD->getType() << /*Const*/1;
8620 return true;
8621 }
8622
8623 if (inUnion() && !FieldType.isConstQualified())
8624 AllFieldsAreConst = false;
8625 } else if (CSM == Sema::CXXCopyConstructor) {
8626 // For a copy constructor, data members must not be of rvalue reference
8627 // type.
8628 if (FieldType->isRValueReferenceType()) {
8629 if (Diagnose)
8630 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference)
8631 << MD->getParent() << FD << FieldType;
8632 return true;
8633 }
8634 } else if (IsAssignment) {
8635 // For an assignment operator, data members must not be of reference type.
8636 if (FieldType->isReferenceType()) {
8637 if (Diagnose)
8638 S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
8639 << isMove() << MD->getParent() << FD << FieldType << /*Reference*/0;
8640 return true;
8641 }
8642 if (!FieldRecord && FieldType.isConstQualified()) {
8643 // C++11 [class.copy]p23:
8644 // -- a non-static data member of const non-class type (or array thereof)
8645 if (Diagnose)
8646 S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
8647 << isMove() << MD->getParent() << FD << FD->getType() << /*Const*/1;
8648 return true;
8649 }
8650 }
8651
8652 if (FieldRecord) {
8653 // Some additional restrictions exist on the variant members.
8654 if (!inUnion() && FieldRecord->isUnion() &&
8655 FieldRecord->isAnonymousStructOrUnion()) {
8656 bool AllVariantFieldsAreConst = true;
8657
8658 // FIXME: Handle anonymous unions declared within anonymous unions.
8659 for (auto *UI : FieldRecord->fields()) {
8660 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType());
8661
8662 if (shouldDeleteForVariantObjCPtrMember(&*UI, UnionFieldType))
8663 return true;
8664
8665 if (!UnionFieldType.isConstQualified())
8666 AllVariantFieldsAreConst = false;
8667
8668 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl();
8669 if (UnionFieldRecord &&
8670 shouldDeleteForClassSubobject(UnionFieldRecord, UI,
8671 UnionFieldType.getCVRQualifiers()))
8672 return true;
8673 }
8674
8675 // At least one member in each anonymous union must be non-const
8676 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst &&
8677 !FieldRecord->field_empty()) {
8678 if (Diagnose)
8679 S.Diag(FieldRecord->getLocation(),
8680 diag::note_deleted_default_ctor_all_const)
8681 << !!ICI << MD->getParent() << /*anonymous union*/1;
8682 return true;
8683 }
8684
8685 // Don't check the implicit member of the anonymous union type.
8686 // This is technically non-conformant, but sanity demands it.
8687 return false;
8688 }
8689
8690 if (shouldDeleteForClassSubobject(FieldRecord, FD,
8691 FieldType.getCVRQualifiers()))
8692 return true;
8693 }
8694
8695 return false;
8696 }
8697
8698 /// C++11 [class.ctor] p5:
8699 /// A defaulted default constructor for a class X is defined as deleted if
8700 /// X is a union and all of its variant members are of const-qualified type.
8701 bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() {
8702 // This is a silly definition, because it gives an empty union a deleted
8703 // default constructor. Don't do that.
8704 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst) {
8705 bool AnyFields = false;
8706 for (auto *F : MD->getParent()->fields())
8707 if ((AnyFields = !F->isUnnamedBitfield()))
8708 break;
8709 if (!AnyFields)
8710 return false;
8711 if (Diagnose)
8712 S.Diag(MD->getParent()->getLocation(),
8713 diag::note_deleted_default_ctor_all_const)
8714 << !!ICI << MD->getParent() << /*not anonymous union*/0;
8715 return true;
8716 }
8717 return false;
8718 }
8719
8720 /// Determine whether a defaulted special member function should be defined as
8721 /// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11,
8722 /// C++11 [class.copy]p23, and C++11 [class.dtor]p5.
8723 bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM,
8724 InheritedConstructorInfo *ICI,
8725 bool Diagnose) {
8726 if (MD->isInvalidDecl())
8727 return false;
8728 CXXRecordDecl *RD = MD->getParent();
8729 assert(!RD->isDependentType() && "do deletion after instantiation");
8730 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl())
8731 return false;
8732
8733 // C++11 [expr.lambda.prim]p19:
8734 // The closure type associated with a lambda-expression has a
8735 // deleted (8.4.3) default constructor and a deleted copy
8736 // assignment operator.
8737 // C++2a adds back these operators if the lambda has no lambda-capture.
8738 if (RD->isLambda() && !RD->lambdaIsDefaultConstructibleAndAssignable() &&
8739 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) {
8740 if (Diagnose)
8741 Diag(RD->getLocation(), diag::note_lambda_decl);
8742 return true;
8743 }
8744
8745 // For an anonymous struct or union, the copy and assignment special members
8746 // will never be used, so skip the check. For an anonymous union declared at
8747 // namespace scope, the constructor and destructor are used.
8748 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor &&
8749 RD->isAnonymousStructOrUnion())
8750 return false;
8751
8752 // C++11 [class.copy]p7, p18:
8753 // If the class definition declares a move constructor or move assignment
8754 // operator, an implicitly declared copy constructor or copy assignment
8755 // operator is defined as deleted.
8756 if (MD->isImplicit() &&
8757 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) {
8758 CXXMethodDecl *UserDeclaredMove = nullptr;
8759
8760 // In Microsoft mode up to MSVC 2013, a user-declared move only causes the
8761 // deletion of the corresponding copy operation, not both copy operations.
8762 // MSVC 2015 has adopted the standards conforming behavior.
8763 bool DeletesOnlyMatchingCopy =
8764 getLangOpts().MSVCCompat &&
8765 !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015);
8766
8767 if (RD->hasUserDeclaredMoveConstructor() &&
8768 (!DeletesOnlyMatchingCopy || CSM == CXXCopyConstructor)) {
8769 if (!Diagnose) return true;
8770
8771 // Find any user-declared move constructor.
8772 for (auto *I : RD->ctors()) {
8773 if (I->isMoveConstructor()) {
8774 UserDeclaredMove = I;
8775 break;
8776 }
8777 }
8778 assert(UserDeclaredMove);
8779 } else if (RD->hasUserDeclaredMoveAssignment() &&
8780 (!DeletesOnlyMatchingCopy || CSM == CXXCopyAssignment)) {
8781 if (!Diagnose) return true;
8782
8783 // Find any user-declared move assignment operator.
8784 for (auto *I : RD->methods()) {
8785 if (I->isMoveAssignmentOperator()) {
8786 UserDeclaredMove = I;
8787 break;
8788 }
8789 }
8790 assert(UserDeclaredMove);
8791 }
8792
8793 if (UserDeclaredMove) {
8794 Diag(UserDeclaredMove->getLocation(),
8795 diag::note_deleted_copy_user_declared_move)
8796 << (CSM == CXXCopyAssignment) << RD
8797 << UserDeclaredMove->isMoveAssignmentOperator();
8798 return true;
8799 }
8800 }
8801
8802 // Do access control from the special member function
8803 ContextRAII MethodContext(*this, MD);
8804
8805 // C++11 [class.dtor]p5:
8806 // -- for a virtual destructor, lookup of the non-array deallocation function
8807 // results in an ambiguity or in a function that is deleted or inaccessible
8808 if (CSM == CXXDestructor && MD->isVirtual()) {
8809 FunctionDecl *OperatorDelete = nullptr;
8810 DeclarationName Name =
8811 Context.DeclarationNames.getCXXOperatorName(OO_Delete);
8812 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name,
8813 OperatorDelete, /*Diagnose*/false)) {
8814 if (Diagnose)
8815 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete);
8816 return true;
8817 }
8818 }
8819
8820 SpecialMemberDeletionInfo SMI(*this, MD, CSM, ICI, Diagnose);
8821
8822 // Per DR1611, do not consider virtual bases of constructors of abstract
8823 // classes, since we are not going to construct them.
8824 // Per DR1658, do not consider virtual bases of destructors of abstract
8825 // classes either.
8826 // Per DR2180, for assignment operators we only assign (and thus only
8827 // consider) direct bases.
8828 if (SMI.visit(SMI.IsAssignment ? SMI.VisitDirectBases
8829 : SMI.VisitPotentiallyConstructedBases))
8830 return true;
8831
8832 if (SMI.shouldDeleteForAllConstMembers())
8833 return true;
8834
8835 if (getLangOpts().CUDA) {
8836 // We should delete the special member in CUDA mode if target inference
8837 // failed.
8838 // For inherited constructors (non-null ICI), CSM may be passed so that MD
8839 // is treated as certain special member, which may not reflect what special
8840 // member MD really is. However inferCUDATargetForImplicitSpecialMember
8841 // expects CSM to match MD, therefore recalculate CSM.
8842 assert(ICI || CSM == getSpecialMember(MD));
8843 auto RealCSM = CSM;
8844 if (ICI)
8845 RealCSM = getSpecialMember(MD);
8846
8847 return inferCUDATargetForImplicitSpecialMember(RD, RealCSM, MD,
8848 SMI.ConstArg, Diagnose);
8849 }
8850
8851 return false;
8852 }
8853
8854 void Sema::DiagnoseDeletedDefaultedFunction(FunctionDecl *FD) {
8855 DefaultedFunctionKind DFK = getDefaultedFunctionKind(FD);
8856 assert(DFK && "not a defaultable function");
8857 assert(FD->isDefaulted() && FD->isDeleted() && "not defaulted and deleted");
8858
8859 if (DFK.isSpecialMember()) {
8860 ShouldDeleteSpecialMember(cast<CXXMethodDecl>(FD), DFK.asSpecialMember(),
8861 nullptr, /*Diagnose=*/true);
8862 } else {
8863 DefaultedComparisonAnalyzer(
8864 *this, cast<CXXRecordDecl>(FD->getLexicalDeclContext()), FD,
8865 DFK.asComparison(), DefaultedComparisonAnalyzer::ExplainDeleted)
8866 .visit();
8867 }
8868 }
8869
8870 /// Perform lookup for a special member of the specified kind, and determine
8871 /// whether it is trivial. If the triviality can be determined without the
8872 /// lookup, skip it. This is intended for use when determining whether a
8873 /// special member of a containing object is trivial, and thus does not ever
8874 /// perform overload resolution for default constructors.
8875 ///
8876 /// If \p Selected is not \c NULL, \c *Selected will be filled in with the
8877 /// member that was most likely to be intended to be trivial, if any.
8878 ///
8879 /// If \p ForCall is true, look at CXXRecord::HasTrivialSpecialMembersForCall to
8880 /// determine whether the special member is trivial.
8881 static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD,
8882 Sema::CXXSpecialMember CSM, unsigned Quals,
8883 bool ConstRHS,
8884 Sema::TrivialABIHandling TAH,
8885 CXXMethodDecl **Selected) {
8886 if (Selected)
8887 *Selected = nullptr;
8888
8889 switch (CSM) {
8890 case Sema::CXXInvalid:
8891 llvm_unreachable("not a special member");
8892
8893 case Sema::CXXDefaultConstructor:
8894 // C++11 [class.ctor]p5:
8895 // A default constructor is trivial if:
8896 // - all the [direct subobjects] have trivial default constructors
8897 //
8898 // Note, no overload resolution is performed in this case.
8899 if (RD->hasTrivialDefaultConstructor())
8900 return true;
8901
8902 if (Selected) {
8903 // If there's a default constructor which could have been trivial, dig it
8904 // out. Otherwise, if there's any user-provided default constructor, point
8905 // to that as an example of why there's not a trivial one.
8906 CXXConstructorDecl *DefCtor = nullptr;
8907 if (RD->needsImplicitDefaultConstructor())
8908 S.DeclareImplicitDefaultConstructor(RD);
8909 for (auto *CI : RD->ctors()) {
8910 if (!CI->isDefaultConstructor())
8911 continue;
8912 DefCtor = CI;
8913 if (!DefCtor->isUserProvided())
8914 break;
8915 }
8916
8917 *Selected = DefCtor;
8918 }
8919
8920 return false;
8921
8922 case Sema::CXXDestructor:
8923 // C++11 [class.dtor]p5:
8924 // A destructor is trivial if:
8925 // - all the direct [subobjects] have trivial destructors
8926 if (RD->hasTrivialDestructor() ||
8927 (TAH == Sema::TAH_ConsiderTrivialABI &&
8928 RD->hasTrivialDestructorForCall()))
8929 return true;
8930
8931 if (Selected) {
8932 if (RD->needsImplicitDestructor())
8933 S.DeclareImplicitDestructor(RD);
8934 *Selected = RD->getDestructor();
8935 }
8936
8937 return false;
8938
8939 case Sema::CXXCopyConstructor:
8940 // C++11 [class.copy]p12:
8941 // A copy constructor is trivial if:
8942 // - the constructor selected to copy each direct [subobject] is trivial
8943 if (RD->hasTrivialCopyConstructor() ||
8944 (TAH == Sema::TAH_ConsiderTrivialABI &&
8945 RD->hasTrivialCopyConstructorForCall())) {
8946 if (Quals == Qualifiers::Const)
8947 // We must either select the trivial copy constructor or reach an
8948 // ambiguity; no need to actually perform overload resolution.
8949 return true;
8950 } else if (!Selected) {
8951 return false;
8952 }
8953 // In C++98, we are not supposed to perform overload resolution here, but we
8954 // treat that as a language defect, as suggested on cxx-abi-dev, to treat
8955 // cases like B as having a non-trivial copy constructor:
8956 // struct A { template<typename T> A(T&); };
8957 // struct B { mutable A a; };
8958 goto NeedOverloadResolution;
8959
8960 case Sema::CXXCopyAssignment:
8961 // C++11 [class.copy]p25:
8962 // A copy assignment operator is trivial if:
8963 // - the assignment operator selected to copy each direct [subobject] is
8964 // trivial
8965 if (RD->hasTrivialCopyAssignment()) {
8966 if (Quals == Qualifiers::Const)
8967 return true;
8968 } else if (!Selected) {
8969 return false;
8970 }
8971 // In C++98, we are not supposed to perform overload resolution here, but we
8972 // treat that as a language defect.
8973 goto NeedOverloadResolution;
8974
8975 case Sema::CXXMoveConstructor:
8976 case Sema::CXXMoveAssignment:
8977 NeedOverloadResolution:
8978 Sema::SpecialMemberOverloadResult SMOR =
8979 lookupCallFromSpecialMember(S, RD, CSM, Quals, ConstRHS);
8980
8981 // The standard doesn't describe how to behave if the lookup is ambiguous.
8982 // We treat it as not making the member non-trivial, just like the standard
8983 // mandates for the default constructor. This should rarely matter, because
8984 // the member will also be deleted.
8985 if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::Ambiguous)
8986 return true;
8987
8988 if (!SMOR.getMethod()) {
8989 assert(SMOR.getKind() ==
8990 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted);
8991 return false;
8992 }
8993
8994 // We deliberately don't check if we found a deleted special member. We're
8995 // not supposed to!
8996 if (Selected)
8997 *Selected = SMOR.getMethod();
8998
8999 if (TAH == Sema::TAH_ConsiderTrivialABI &&
9000 (CSM == Sema::CXXCopyConstructor || CSM == Sema::CXXMoveConstructor))
9001 return SMOR.getMethod()->isTrivialForCall();
9002 return SMOR.getMethod()->isTrivial();
9003 }
9004
9005 llvm_unreachable("unknown special method kind");
9006 }
9007
9008 static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) {
9009 for (auto *CI : RD->ctors())
9010 if (!CI->isImplicit())
9011 return CI;
9012
9013 // Look for constructor templates.
9014 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter;
9015 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) {
9016 if (CXXConstructorDecl *CD =
9017 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()))
9018 return CD;
9019 }
9020
9021 return nullptr;
9022 }
9023
9024 /// The kind of subobject we are checking for triviality. The values of this
9025 /// enumeration are used in diagnostics.
9026 enum TrivialSubobjectKind {
9027 /// The subobject is a base class.
9028 TSK_BaseClass,
9029 /// The subobject is a non-static data member.
9030 TSK_Field,
9031 /// The object is actually the complete object.
9032 TSK_CompleteObject
9033 };
9034
9035 /// Check whether the special member selected for a given type would be trivial.
9036 static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc,
9037 QualType SubType, bool ConstRHS,
9038 Sema::CXXSpecialMember CSM,
9039 TrivialSubobjectKind Kind,
9040 Sema::TrivialABIHandling TAH, bool Diagnose) {
9041 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl();
9042 if (!SubRD)
9043 return true;
9044
9045 CXXMethodDecl *Selected;
9046 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(),
9047 ConstRHS, TAH, Diagnose ? &Selected : nullptr))
9048 return true;
9049
9050 if (Diagnose) {
9051 if (ConstRHS)
9052 SubType.addConst();
9053
9054 if (!Selected && CSM == Sema::CXXDefaultConstructor) {
9055 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor)
9056 << Kind << SubType.getUnqualifiedType();
9057 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD))
9058 S.Diag(CD->getLocation(), diag::note_user_declared_ctor);
9059 } else if (!Selected)
9060 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy)
9061 << Kind << SubType.getUnqualifiedType() << CSM << SubType;
9062 else if (Selected->isUserProvided()) {
9063 if (Kind == TSK_CompleteObject)
9064 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided)
9065 << Kind << SubType.getUnqualifiedType() << CSM;
9066 else {
9067 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided)
9068 << Kind << SubType.getUnqualifiedType() << CSM;
9069 S.Diag(Selected->getLocation(), diag::note_declared_at);
9070 }
9071 } else {
9072 if (Kind != TSK_CompleteObject)
9073 S.Diag(SubobjLoc, diag::note_nontrivial_subobject)
9074 << Kind << SubType.getUnqualifiedType() << CSM;
9075
9076 // Explain why the defaulted or deleted special member isn't trivial.
9077 S.SpecialMemberIsTrivial(Selected, CSM, Sema::TAH_IgnoreTrivialABI,
9078 Diagnose);
9079 }
9080 }
9081
9082 return false;
9083 }
9084
9085 /// Check whether the members of a class type allow a special member to be
9086 /// trivial.
9087 static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD,
9088 Sema::CXXSpecialMember CSM,
9089 bool ConstArg,
9090 Sema::TrivialABIHandling TAH,
9091 bool Diagnose) {
9092 for (const auto *FI : RD->fields()) {
9093 if (FI->isInvalidDecl() || FI->isUnnamedBitfield())
9094 continue;
9095
9096 QualType FieldType = S.Context.getBaseElementType(FI->getType());
9097
9098 // Pretend anonymous struct or union members are members of this class.
9099 if (FI->isAnonymousStructOrUnion()) {
9100 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(),
9101 CSM, ConstArg, TAH, Diagnose))
9102 return false;
9103 continue;
9104 }
9105
9106 // C++11 [class.ctor]p5:
9107 // A default constructor is trivial if [...]
9108 // -- no non-static data member of its class has a
9109 // brace-or-equal-initializer
9110 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) {
9111 if (Diagnose)
9112 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << FI;
9113 return false;
9114 }
9115
9116 // Objective C ARC 4.3.5:
9117 // [...] nontrivally ownership-qualified types are [...] not trivially
9118 // default constructible, copy constructible, move constructible, copy
9119 // assignable, move assignable, or destructible [...]
9120 if (FieldType.hasNonTrivialObjCLifetime()) {
9121 if (Diagnose)
9122 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership)
9123 << RD << FieldType.getObjCLifetime();
9124 return false;
9125 }
9126
9127 bool ConstRHS = ConstArg && !FI->isMutable();
9128 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, ConstRHS,
9129 CSM, TSK_Field, TAH, Diagnose))
9130 return false;
9131 }
9132
9133 return true;
9134 }
9135
9136 /// Diagnose why the specified class does not have a trivial special member of
9137 /// the given kind.
9138 void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) {
9139 QualType Ty = Context.getRecordType(RD);
9140
9141 bool ConstArg = (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment);
9142 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, ConstArg, CSM,
9143 TSK_CompleteObject, TAH_IgnoreTrivialABI,
9144 /*Diagnose*/true);
9145 }
9146
9147 /// Determine whether a defaulted or deleted special member function is trivial,
9148 /// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12,
9149 /// C++11 [class.copy]p25, and C++11 [class.dtor]p5.
9150 bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM,
9151 TrivialABIHandling TAH, bool Diagnose) {
9152 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough");
9153
9154 CXXRecordDecl *RD = MD->getParent();
9155
9156 bool ConstArg = false;
9157
9158 // C++11 [class.copy]p12, p25: [DR1593]
9159 // A [special member] is trivial if [...] its parameter-type-list is
9160 // equivalent to the parameter-type-list of an implicit declaration [...]
9161 switch (CSM) {
9162 case CXXDefaultConstructor:
9163 case CXXDestructor:
9164 // Trivial default constructors and destructors cannot have parameters.
9165 break;
9166
9167 case CXXCopyConstructor:
9168 case CXXCopyAssignment: {
9169 // Trivial copy operations always have const, non-volatile parameter types.
9170 ConstArg = true;
9171 const ParmVarDecl *Param0 = MD->getParamDecl(0);
9172 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>();
9173 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) {
9174 if (Diagnose)
9175 Diag(Param0->getLocation(), diag::note_nontrivial_param_type)
9176 << Param0->getSourceRange() << Param0->getType()
9177 << Context.getLValueReferenceType(
9178 Context.getRecordType(RD).withConst());
9179 return false;
9180 }
9181 break;
9182 }
9183
9184 case CXXMoveConstructor:
9185 case CXXMoveAssignment: {
9186 // Trivial move operations always have non-cv-qualified parameters.
9187 const ParmVarDecl *Param0 = MD->getParamDecl(0);
9188 const RValueReferenceType *RT =
9189 Param0->getType()->getAs<RValueReferenceType>();
9190 if (!RT || RT->getPointeeType().getCVRQualifiers()) {
9191 if (Diagnose)
9192 Diag(Param0->getLocation(), diag::note_nontrivial_param_type)
9193 << Param0->getSourceRange() << Param0->getType()
9194 << Context.getRValueReferenceType(Context.getRecordType(RD));
9195 return false;
9196 }
9197 break;
9198 }
9199
9200 case CXXInvalid:
9201 llvm_unreachable("not a special member");
9202 }
9203
9204 if (MD->getMinRequiredArguments() < MD->getNumParams()) {
9205 if (Diagnose)
9206 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(),
9207 diag::note_nontrivial_default_arg)
9208 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange();
9209 return false;
9210 }
9211 if (MD->isVariadic()) {
9212 if (Diagnose)
9213 Diag(MD->getLocation(), diag::note_nontrivial_variadic);
9214 return false;
9215 }
9216
9217 // C++11 [class.ctor]p5, C++11 [class.dtor]p5:
9218 // A copy/move [constructor or assignment operator] is trivial if
9219 // -- the [member] selected to copy/move each direct base class subobject
9220 // is trivial
9221 //
9222 // C++11 [class.copy]p12, C++11 [class.copy]p25:
9223 // A [default constructor or destructor] is trivial if
9224 // -- all the direct base classes have trivial [default constructors or
9225 // destructors]
9226 for (const auto &BI : RD->bases())
9227 if (!checkTrivialSubobjectCall(*this, BI.getBeginLoc(), BI.getType(),
9228 ConstArg, CSM, TSK_BaseClass, TAH, Diagnose))
9229 return false;
9230
9231 // C++11 [class.ctor]p5, C++11 [class.dtor]p5:
9232 // A copy/move [constructor or assignment operator] for a class X is
9233 // trivial if
9234 // -- for each non-static data member of X that is of class type (or array
9235 // thereof), the constructor selected to copy/move that member is
9236 // trivial
9237 //
9238 // C++11 [class.copy]p12, C++11 [class.copy]p25:
9239 // A [default constructor or destructor] is trivial if
9240 // -- for all of the non-static data members of its class that are of class
9241 // type (or array thereof), each such class has a trivial [default
9242 // constructor or destructor]
9243 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, TAH, Diagnose))
9244 return false;
9245
9246 // C++11 [class.dtor]p5:
9247 // A destructor is trivial if [...]
9248 // -- the destructor is not virtual
9249 if (CSM == CXXDestructor && MD->isVirtual()) {
9250 if (Diagnose)
9251 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD;
9252 return false;
9253 }
9254
9255 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25:
9256 // A [special member] for class X is trivial if [...]
9257 // -- class X has no virtual functions and no virtual base classes
9258 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) {
9259 if (!Diagnose)
9260 return false;
9261
9262 if (RD->getNumVBases()) {
9263 // Check for virtual bases. We already know that the corresponding
9264 // member in all bases is trivial, so vbases must all be direct.
9265 CXXBaseSpecifier &BS = *RD->vbases_begin();
9266 assert(BS.isVirtual());
9267 Diag(BS.getBeginLoc(), diag::note_nontrivial_has_virtual) << RD << 1;
9268 return false;
9269 }
9270
9271 // Must have a virtual method.
9272 for (const auto *MI : RD->methods()) {
9273 if (MI->isVirtual()) {
9274 SourceLocation MLoc = MI->getBeginLoc();
9275 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0;
9276 return false;
9277 }
9278 }
9279
9280 llvm_unreachable("dynamic class with no vbases and no virtual functions");
9281 }
9282
9283 // Looks like it's trivial!
9284 return true;
9285 }
9286
9287 namespace {
9288 struct FindHiddenVirtualMethod {
9289 Sema *S;
9290 CXXMethodDecl *Method;
9291 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods;
9292 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
9293
9294 private:
9295 /// Check whether any most overridden method from MD in Methods
9296 static bool CheckMostOverridenMethods(
9297 const CXXMethodDecl *MD,
9298 const llvm::SmallPtrSetImpl<const CXXMethodDecl *> &Methods) {
9299 if (MD->size_overridden_methods() == 0)
9300 return Methods.count(MD->getCanonicalDecl());
9301 for (const CXXMethodDecl *O : MD->overridden_methods())
9302 if (CheckMostOverridenMethods(O, Methods))
9303 return true;
9304 return false;
9305 }
9306
9307 public:
9308 /// Member lookup function that determines whether a given C++
9309 /// method overloads virtual methods in a base class without overriding any,
9310 /// to be used with CXXRecordDecl::lookupInBases().
9311 bool operator()(const CXXBaseSpecifier *Specifier, CXXBasePath &Path) {
9312 RecordDecl *BaseRecord =
9313 Specifier->getType()->castAs<RecordType>()->getDecl();
9314
9315 DeclarationName Name = Method->getDeclName();
9316 assert(Name.getNameKind() == DeclarationName::Identifier);
9317
9318 bool foundSameNameMethod = false;
9319 SmallVector<CXXMethodDecl *, 8> overloadedMethods;
9320 for (Path.Decls = BaseRecord->lookup(Name); !Path.Decls.empty();
9321 Path.Decls = Path.Decls.slice(1)) {
9322 NamedDecl *D = Path.Decls.front();
9323 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
9324 MD = MD->getCanonicalDecl();
9325 foundSameNameMethod = true;
9326 // Interested only in hidden virtual methods.
9327 if (!MD->isVirtual())
9328 continue;
9329 // If the method we are checking overrides a method from its base
9330 // don't warn about the other overloaded methods. Clang deviates from
9331 // GCC by only diagnosing overloads of inherited virtual functions that
9332 // do not override any other virtual functions in the base. GCC's
9333 // -Woverloaded-virtual diagnoses any derived function hiding a virtual
9334 // function from a base class. These cases may be better served by a
9335 // warning (not specific to virtual functions) on call sites when the
9336 // call would select a different function from the base class, were it
9337 // visible.
9338 // See FIXME in test/SemaCXX/warn-overload-virtual.cpp for an example.
9339 if (!S->IsOverload(Method, MD, false))
9340 return true;
9341 // Collect the overload only if its hidden.
9342 if (!CheckMostOverridenMethods(MD, OverridenAndUsingBaseMethods))
9343 overloadedMethods.push_back(MD);
9344 }
9345 }
9346
9347 if (foundSameNameMethod)
9348 OverloadedMethods.append(overloadedMethods.begin(),
9349 overloadedMethods.end());
9350 return foundSameNameMethod;
9351 }
9352 };
9353 } // end anonymous namespace
9354
9355 /// Add the most overriden methods from MD to Methods
9356 static void AddMostOverridenMethods(const CXXMethodDecl *MD,
9357 llvm::SmallPtrSetImpl<const CXXMethodDecl *>& Methods) {
9358 if (MD->size_overridden_methods() == 0)
9359 Methods.insert(MD->getCanonicalDecl());
9360 else
9361 for (const CXXMethodDecl *O : MD->overridden_methods())
9362 AddMostOverridenMethods(O, Methods);
9363 }
9364
9365 /// Check if a method overloads virtual methods in a base class without
9366 /// overriding any.
9367 void Sema::FindHiddenVirtualMethods(CXXMethodDecl *MD,
9368 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) {
9369 if (!MD->getDeclName().isIdentifier())
9370 return;
9371
9372 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases.
9373 /*bool RecordPaths=*/false,
9374 /*bool DetectVirtual=*/false);
9375 FindHiddenVirtualMethod FHVM;
9376 FHVM.Method = MD;
9377 FHVM.S = this;
9378
9379 // Keep the base methods that were overridden or introduced in the subclass
9380 // by 'using' in a set. A base method not in this set is hidden.
9381 CXXRecordDecl *DC = MD->getParent();
9382 DeclContext::lookup_result R = DC->lookup(MD->getDeclName());
9383 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) {
9384 NamedDecl *ND = *I;
9385 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I))
9386 ND = shad->getTargetDecl();
9387 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND))
9388 AddMostOverridenMethods(MD, FHVM.OverridenAndUsingBaseMethods);
9389 }
9390
9391 if (DC->lookupInBases(FHVM, Paths))
9392 OverloadedMethods = FHVM.OverloadedMethods;
9393 }
9394
9395 void Sema::NoteHiddenVirtualMethods(CXXMethodDecl *MD,
9396 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) {
9397 for (unsigned i = 0, e = OverloadedMethods.size(); i != e; ++i) {
9398 CXXMethodDecl *overloadedMD = OverloadedMethods[i];
9399 PartialDiagnostic PD = PDiag(
9400 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD;
9401 HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType());
9402 Diag(overloadedMD->getLocation(), PD);
9403 }
9404 }
9405
9406 /// Diagnose methods which overload virtual methods in a base class
9407 /// without overriding any.
9408 void Sema::DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD) {
9409 if (MD->isInvalidDecl())
9410 return;
9411
9412 if (Diags.isIgnored(diag::warn_overloaded_virtual, MD->getLocation()))
9413 return;
9414
9415 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
9416 FindHiddenVirtualMethods(MD, OverloadedMethods);
9417 if (!OverloadedMethods.empty()) {
9418 Diag(MD->getLocation(), diag::warn_overloaded_virtual)
9419 << MD << (OverloadedMethods.size() > 1);
9420
9421 NoteHiddenVirtualMethods(MD, OverloadedMethods);
9422 }
9423 }
9424
9425 void Sema::checkIllFormedTrivialABIStruct(CXXRecordDecl &RD) {
9426 auto PrintDiagAndRemoveAttr = [&]() {
9427 // No diagnostics if this is a template instantiation.
9428 if (!isTemplateInstantiation(RD.getTemplateSpecializationKind()))
9429 Diag(RD.getAttr<TrivialABIAttr>()->getLocation(),
9430 diag::ext_cannot_use_trivial_abi) << &RD;
9431 RD.dropAttr<TrivialABIAttr>();
9432 };
9433
9434 // Ill-formed if the struct has virtual functions.
9435 if (RD.isPolymorphic()) {
9436 PrintDiagAndRemoveAttr();
9437 return;
9438 }
9439
9440 for (const auto &B : RD.bases()) {
9441 // Ill-formed if the base class is non-trivial for the purpose of calls or a
9442 // virtual base.
9443 if ((!B.getType()->isDependentType() &&
9444 !B.getType()->getAsCXXRecordDecl()->canPassInRegisters()) ||
9445 B.isVirtual()) {
9446 PrintDiagAndRemoveAttr();
9447 return;
9448 }
9449 }
9450
9451 for (const auto *FD : RD.fields()) {
9452 // Ill-formed if the field is an ObjectiveC pointer or of a type that is
9453 // non-trivial for the purpose of calls.
9454 QualType FT = FD->getType();
9455 if (FT.getObjCLifetime() == Qualifiers::OCL_Weak) {
9456 PrintDiagAndRemoveAttr();
9457 return;
9458 }
9459
9460 if (const auto *RT = FT->getBaseElementTypeUnsafe()->getAs<RecordType>())
9461 if (!RT->isDependentType() &&
9462 !cast<CXXRecordDecl>(RT->getDecl())->canPassInRegisters()) {
9463 PrintDiagAndRemoveAttr();
9464 return;
9465 }
9466 }
9467 }
9468
9469 void Sema::ActOnFinishCXXMemberSpecification(
9470 Scope *S, SourceLocation RLoc, Decl *TagDecl, SourceLocation LBrac,
9471 SourceLocation RBrac, const ParsedAttributesView &AttrList) {
9472 if (!TagDecl)
9473 return;
9474
9475 AdjustDeclIfTemplate(TagDecl);
9476
9477 for (const ParsedAttr &AL : AttrList) {
9478 if (AL.getKind() != ParsedAttr::AT_Visibility)
9479 continue;
9480 AL.setInvalid();
9481 Diag(AL.getLoc(), diag::warn_attribute_after_definition_ignored) << AL;
9482 }
9483
9484 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef(
9485 // strict aliasing violation!
9486 reinterpret_cast<Decl**>(FieldCollector->getCurFields()),
9487 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList);
9488
9489 CheckCompletedCXXClass(S, cast<CXXRecordDecl>(TagDecl));
9490 }
9491
9492 /// Find the equality comparison functions that should be implicitly declared
9493 /// in a given class definition, per C++2a [class.compare.default]p3.
9494 static void findImplicitlyDeclaredEqualityComparisons(
9495 ASTContext &Ctx, CXXRecordDecl *RD,
9496 llvm::SmallVectorImpl<FunctionDecl *> &Spaceships) {
9497 DeclarationName EqEq = Ctx.DeclarationNames.getCXXOperatorName(OO_EqualEqual);
9498 if (!RD->lookup(EqEq).empty())
9499 // Member operator== explicitly declared: no implicit operator==s.
9500 return;
9501
9502 // Traverse friends looking for an '==' or a '<=>'.
9503 for (FriendDecl *Friend : RD->friends()) {
9504 FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(Friend->getFriendDecl());
9505 if (!FD) continue;
9506
9507 if (FD->getOverloadedOperator() == OO_EqualEqual) {
9508 // Friend operator== explicitly declared: no implicit operator==s.
9509 Spaceships.clear();
9510 return;
9511 }
9512
9513 if (FD->getOverloadedOperator() == OO_Spaceship &&
9514 FD->isExplicitlyDefaulted())
9515 Spaceships.push_back(FD);
9516 }
9517
9518 // Look for members named 'operator<=>'.
9519 DeclarationName Cmp = Ctx.DeclarationNames.getCXXOperatorName(OO_Spaceship);
9520 for (NamedDecl *ND : RD->lookup(Cmp)) {
9521 // Note that we could find a non-function here (either a function template
9522 // or a using-declaration). Neither case results in an implicit
9523 // 'operator=='.
9524 if (auto *FD = dyn_cast<FunctionDecl>(ND))
9525 if (FD->isExplicitlyDefaulted())
9526 Spaceships.push_back(FD);
9527 }
9528 }
9529
9530 /// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared
9531 /// special functions, such as the default constructor, copy
9532 /// constructor, or destructor, to the given C++ class (C++
9533 /// [special]p1). This routine can only be executed just before the
9534 /// definition of the class is complete.
9535 void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
9536 if (ClassDecl->needsImplicitDefaultConstructor()) {
9537 ++getASTContext().NumImplicitDefaultConstructors;
9538
9539 if (ClassDecl->hasInheritedConstructor())
9540 DeclareImplicitDefaultConstructor(ClassDecl);
9541 }
9542
9543 if (ClassDecl->needsImplicitCopyConstructor()) {
9544 ++getASTContext().NumImplicitCopyConstructors;
9545
9546 // If the properties or semantics of the copy constructor couldn't be
9547 // determined while the class was being declared, force a declaration
9548 // of it now.
9549 if (ClassDecl->needsOverloadResolutionForCopyConstructor() ||
9550 ClassDecl->hasInheritedConstructor())
9551 DeclareImplicitCopyConstructor(ClassDecl);
9552 // For the MS ABI we need to know whether the copy ctor is deleted. A
9553 // prerequisite for deleting the implicit copy ctor is that the class has a
9554 // move ctor or move assignment that is either user-declared or whose
9555 // semantics are inherited from a subobject. FIXME: We should provide a more
9556 // direct way for CodeGen to ask whether the constructor was deleted.
9557 else if (Context.getTargetInfo().getCXXABI().isMicrosoft() &&
9558 (ClassDecl->hasUserDeclaredMoveConstructor() ||
9559 ClassDecl->needsOverloadResolutionForMoveConstructor() ||
9560 ClassDecl->hasUserDeclaredMoveAssignment() ||
9561 ClassDecl->needsOverloadResolutionForMoveAssignment()))
9562 DeclareImplicitCopyConstructor(ClassDecl);
9563 }
9564
9565 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) {
9566 ++getASTContext().NumImplicitMoveConstructors;
9567
9568 if (ClassDecl->needsOverloadResolutionForMoveConstructor() ||
9569 ClassDecl->hasInheritedConstructor())
9570 DeclareImplicitMoveConstructor(ClassDecl);
9571 }
9572
9573 if (ClassDecl->needsImplicitCopyAssignment()) {
9574 ++getASTContext().NumImplicitCopyAssignmentOperators;
9575
9576 // If we have a dynamic class, then the copy assignment operator may be
9577 // virtual, so we have to declare it immediately. This ensures that, e.g.,
9578 // it shows up in the right place in the vtable and that we diagnose
9579 // problems with the implicit exception specification.
9580 if (ClassDecl->isDynamicClass() ||
9581 ClassDecl->needsOverloadResolutionForCopyAssignment() ||
9582 ClassDecl->hasInheritedAssignment())
9583 DeclareImplicitCopyAssignment(ClassDecl);
9584 }
9585
9586 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) {
9587 ++getASTContext().NumImplicitMoveAssignmentOperators;
9588
9589 // Likewise for the move assignment operator.
9590 if (ClassDecl->isDynamicClass() ||
9591 ClassDecl->needsOverloadResolutionForMoveAssignment() ||
9592 ClassDecl->hasInheritedAssignment())
9593 DeclareImplicitMoveAssignment(ClassDecl);
9594 }
9595
9596 if (ClassDecl->needsImplicitDestructor()) {
9597 ++getASTContext().NumImplicitDestructors;
9598
9599 // If we have a dynamic class, then the destructor may be virtual, so we
9600 // have to declare the destructor immediately. This ensures that, e.g., it
9601 // shows up in the right place in the vtable and that we diagnose problems
9602 // with the implicit exception specification.
9603 if (ClassDecl->isDynamicClass() ||
9604 ClassDecl->needsOverloadResolutionForDestructor())
9605 DeclareImplicitDestructor(ClassDecl);
9606 }
9607
9608 // C++2a [class.compare.default]p3:
9609 // If the member-specification does not explicitly declare any member or
9610 // friend named operator==, an == operator function is declared implicitly
9611 // for each defaulted three-way comparison operator function defined in the
9612 // member-specification
9613 // FIXME: Consider doing this lazily.
9614 if (getLangOpts().CPlusPlus2a) {
9615 llvm::SmallVector<FunctionDecl*, 4> DefaultedSpaceships;
9616 findImplicitlyDeclaredEqualityComparisons(Context, ClassDecl,
9617 DefaultedSpaceships);
9618 for (auto *FD : DefaultedSpaceships)
9619 DeclareImplicitEqualityComparison(ClassDecl, FD);
9620 }
9621 }
9622
9623 unsigned Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) {
9624 if (!D)
9625 return 0;
9626
9627 // The order of template parameters is not important here. All names
9628 // get added to the same scope.
9629 SmallVector<TemplateParameterList *, 4> ParameterLists;
9630
9631 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D))
9632 D = TD->getTemplatedDecl();
9633
9634 if (auto *PSD = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
9635 ParameterLists.push_back(PSD->getTemplateParameters());
9636
9637 if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) {
9638 for (unsigned i = 0; i < DD->getNumTemplateParameterLists(); ++i)
9639 ParameterLists.push_back(DD->getTemplateParameterList(i));
9640
9641 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
9642 if (FunctionTemplateDecl *FTD = FD->getDescribedFunctionTemplate())
9643 ParameterLists.push_back(FTD->getTemplateParameters());
9644 }
9645 }
9646
9647 if (TagDecl *TD = dyn_cast<TagDecl>(D)) {
9648 for (unsigned i = 0; i < TD->getNumTemplateParameterLists(); ++i)
9649 ParameterLists.push_back(TD->getTemplateParameterList(i));
9650
9651 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) {
9652 if (ClassTemplateDecl *CTD = RD->getDescribedClassTemplate())
9653 ParameterLists.push_back(CTD->getTemplateParameters());
9654 }
9655 }
9656
9657 unsigned Count = 0;
9658 for (TemplateParameterList *Params : ParameterLists) {
9659 if (Params->size() > 0)
9660 // Ignore explicit specializations; they don't contribute to the template
9661 // depth.
9662 ++Count;
9663 for (NamedDecl *Param : *Params) {
9664 if (Param->getDeclName()) {
9665 S->AddDecl(Param);
9666 IdResolver.AddDecl(Param);
9667 }
9668 }
9669 }
9670
9671 return Count;
9672 }
9673
9674 void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
9675 if (!RecordD) return;
9676 AdjustDeclIfTemplate(RecordD);
9677 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD);
9678 PushDeclContext(S, Record);
9679 }
9680
9681 void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
9682 if (!RecordD) return;
9683 PopDeclContext();
9684 }
9685
9686 /// This is used to implement the constant expression evaluation part of the
9687 /// attribute enable_if extension. There is nothing in standard C++ which would
9688 /// require reentering parameters.
9689 void Sema::ActOnReenterCXXMethodParameter(Scope *S, ParmVarDecl *Param) {
9690 if (!Param)
9691 return;
9692
9693 S->AddDecl(Param);
9694 if (Param->getDeclName())
9695 IdResolver.AddDecl(Param);
9696 }
9697
9698 /// ActOnStartDelayedCXXMethodDeclaration - We have completed
9699 /// parsing a top-level (non-nested) C++ class, and we are now
9700 /// parsing those parts of the given Method declaration that could
9701 /// not be parsed earlier (C++ [class.mem]p2), such as default
9702 /// arguments. This action should enter the scope of the given
9703 /// Method declaration as if we had just parsed the qualified method
9704 /// name. However, it should not bring the parameters into scope;
9705 /// that will be performed by ActOnDelayedCXXMethodParameter.
9706 void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
9707 }
9708
9709 /// ActOnDelayedCXXMethodParameter - We've already started a delayed
9710 /// C++ method declaration. We're (re-)introducing the given
9711 /// function parameter into scope for use in parsing later parts of
9712 /// the method declaration. For example, we could see an
9713 /// ActOnParamDefaultArgument event for this parameter.
9714 void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) {
9715 if (!ParamD)
9716 return;
9717
9718 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD);
9719
9720 // If this parameter has an unparsed default argument, clear it out
9721 // to make way for the parsed default argument.
9722 if (Param->hasUnparsedDefaultArg())
9723 Param->setDefaultArg(nullptr);
9724
9725 S->AddDecl(Param);
9726 if (Param->getDeclName())
9727 IdResolver.AddDecl(Param);
9728 }
9729
9730 /// ActOnFinishDelayedCXXMethodDeclaration - We have finished
9731 /// processing the delayed method declaration for Method. The method
9732 /// declaration is now considered finished. There may be a separate
9733 /// ActOnStartOfFunctionDef action later (not necessarily
9734 /// immediately!) for this method, if it was also defined inside the
9735 /// class body.
9736 void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
9737 if (!MethodD)
9738 return;
9739
9740 AdjustDeclIfTemplate(MethodD);
9741
9742 FunctionDecl *Method = cast<FunctionDecl>(MethodD);
9743
9744 // Now that we have our default arguments, check the constructor
9745 // again. It could produce additional diagnostics or affect whether
9746 // the class has implicitly-declared destructors, among other
9747 // things.
9748 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method))
9749 CheckConstructor(Constructor);
9750
9751 // Check the default arguments, which we may have added.
9752 if (!Method->isInvalidDecl())
9753 CheckCXXDefaultArguments(Method);
9754 }
9755
9756 // Emit the given diagnostic for each non-address-space qualifier.
9757 // Common part of CheckConstructorDeclarator and CheckDestructorDeclarator.
9758 static void checkMethodTypeQualifiers(Sema &S, Declarator &D, unsigned DiagID) {
9759 const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
9760 if (FTI.hasMethodTypeQualifiers() && !D.isInvalidType()) {
9761 bool DiagOccured = false;
9762 FTI.MethodQualifiers->forEachQualifier(
9763 [DiagID, &S, &DiagOccured](DeclSpec::TQ, StringRef QualName,
9764 SourceLocation SL) {
9765 // This diagnostic should be emitted on any qualifier except an addr
9766 // space qualifier. However, forEachQualifier currently doesn't visit
9767 // addr space qualifiers, so there's no way to write this condition
9768 // right now; we just diagnose on everything.
9769 S.Diag(SL, DiagID) << QualName << SourceRange(SL);
9770 DiagOccured = true;
9771 });
9772 if (DiagOccured)
9773 D.setInvalidType();
9774 }
9775 }
9776
9777 /// CheckConstructorDeclarator - Called by ActOnDeclarator to check
9778 /// the well-formedness of the constructor declarator @p D with type @p
9779 /// R. If there are any errors in the declarator, this routine will
9780 /// emit diagnostics and set the invalid bit to true. In any case, the type
9781 /// will be updated to reflect a well-formed type for the constructor and
9782 /// returned.
9783 QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R,
9784 StorageClass &SC) {
9785 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
9786
9787 // C++ [class.ctor]p3:
9788 // A constructor shall not be virtual (10.3) or static (9.4). A
9789 // constructor can be invoked for a const, volatile or const
9790 // volatile object. A constructor shall not be declared const,
9791 // volatile, or const volatile (9.3.2).
9792 if (isVirtual) {
9793 if (!D.isInvalidType())
9794 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
9795 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc())
9796 << SourceRange(D.getIdentifierLoc());
9797 D.setInvalidType();
9798 }
9799 if (SC == SC_Static) {
9800 if (!D.isInvalidType())
9801 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
9802 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
9803 << SourceRange(D.getIdentifierLoc());
9804 D.setInvalidType();
9805 SC = SC_None;
9806 }
9807
9808 if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) {
9809 diagnoseIgnoredQualifiers(
9810 diag::err_constructor_return_type, TypeQuals, SourceLocation(),
9811 D.getDeclSpec().getConstSpecLoc(), D.getDeclSpec().getVolatileSpecLoc(),
9812 D.getDeclSpec().getRestrictSpecLoc(),
9813 D.getDeclSpec().getAtomicSpecLoc());
9814 D.setInvalidType();
9815 }
9816
9817 checkMethodTypeQualifiers(*this, D, diag::err_invalid_qualified_constructor);
9818
9819 // C++0x [class.ctor]p4:
9820 // A constructor shall not be declared with a ref-qualifier.
9821 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
9822 if (FTI.hasRefQualifier()) {
9823 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor)
9824 << FTI.RefQualifierIsLValueRef
9825 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
9826 D.setInvalidType();
9827 }
9828
9829 // Rebuild the function type "R" without any type qualifiers (in
9830 // case any of the errors above fired) and with "void" as the
9831 // return type, since constructors don't have return types.
9832 const FunctionProtoType *Proto = R->castAs<FunctionProtoType>();
9833 if (Proto->getReturnType() == Context.VoidTy && !D.isInvalidType())
9834 return R;
9835
9836 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
9837 EPI.TypeQuals = Qualifiers();
9838 EPI.RefQualifier = RQ_None;
9839
9840 return Context.getFunctionType(Context.VoidTy, Proto->getParamTypes(), EPI);
9841 }
9842
9843 /// CheckConstructor - Checks a fully-formed constructor for
9844 /// well-formedness, issuing any diagnostics required. Returns true if
9845 /// the constructor declarator is invalid.
9846 void Sema::CheckConstructor(CXXConstructorDecl *Constructor) {
9847 CXXRecordDecl *ClassDecl
9848 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext());
9849 if (!ClassDecl)
9850 return Constructor->setInvalidDecl();
9851
9852 // C++ [class.copy]p3:
9853 // A declaration of a constructor for a class X is ill-formed if
9854 // its first parameter is of type (optionally cv-qualified) X and
9855 // either there are no other parameters or else all other
9856 // parameters have default arguments.
9857 if (!Constructor->isInvalidDecl() &&
9858 ((Constructor->getNumParams() == 1) ||
9859 (Constructor->getNumParams() > 1 &&
9860 Constructor->getParamDecl(1)->hasDefaultArg())) &&
9861 Constructor->getTemplateSpecializationKind()
9862 != TSK_ImplicitInstantiation) {
9863 QualType ParamType = Constructor->getParamDecl(0)->getType();
9864 QualType ClassTy = Context.getTagDeclType(ClassDecl);
9865 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) {
9866 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation();
9867 const char *ConstRef
9868 = Constructor->getParamDecl(0)->getIdentifier() ? "const &"
9869 : " const &";
9870 Diag(ParamLoc, diag::err_constructor_byvalue_arg)
9871 << FixItHint::CreateInsertion(ParamLoc, ConstRef);
9872
9873 // FIXME: Rather that making the constructor invalid, we should endeavor
9874 // to fix the type.
9875 Constructor->setInvalidDecl();
9876 }
9877 }
9878 }
9879
9880 /// CheckDestructor - Checks a fully-formed destructor definition for
9881 /// well-formedness, issuing any diagnostics required. Returns true
9882 /// on error.
9883 bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) {
9884 CXXRecordDecl *RD = Destructor->getParent();
9885
9886 if (!Destructor->getOperatorDelete() && Destructor->isVirtual()) {
9887 SourceLocation Loc;
9888
9889 if (!Destructor->isImplicit())
9890 Loc = Destructor->getLocation();
9891 else
9892 Loc = RD->getLocation();
9893
9894 // If we have a virtual destructor, look up the deallocation function
9895 if (FunctionDecl *OperatorDelete =
9896 FindDeallocationFunctionForDestructor(Loc, RD)) {
9897 Expr *ThisArg = nullptr;
9898
9899 // If the notional 'delete this' expression requires a non-trivial
9900 // conversion from 'this' to the type of a destroying operator delete's
9901 // first parameter, perform that conversion now.
9902 if (OperatorDelete->isDestroyingOperatorDelete()) {
9903 QualType ParamType = OperatorDelete->getParamDecl(0)->getType();
9904 if (!declaresSameEntity(ParamType->getAsCXXRecordDecl(), RD)) {
9905 // C++ [class.dtor]p13:
9906 // ... as if for the expression 'delete this' appearing in a
9907 // non-virtual destructor of the destructor's class.
9908 ContextRAII SwitchContext(*this, Destructor);
9909 ExprResult This =
9910 ActOnCXXThis(OperatorDelete->getParamDecl(0)->getLocation());
9911 assert(!This.isInvalid() && "couldn't form 'this' expr in dtor?");
9912 This = PerformImplicitConversion(This.get(), ParamType, AA_Passing);
9913 if (This.isInvalid()) {
9914 // FIXME: Register this as a context note so that it comes out
9915 // in the right order.
9916 Diag(Loc, diag::note_implicit_delete_this_in_destructor_here);
9917 return true;
9918 }
9919 ThisArg = This.get();
9920 }
9921 }
9922
9923 DiagnoseUseOfDecl(OperatorDelete, Loc);
9924 MarkFunctionReferenced(Loc, OperatorDelete);
9925 Destructor->setOperatorDelete(OperatorDelete, ThisArg);
9926 }
9927 }
9928
9929 return false;
9930 }
9931
9932 /// CheckDestructorDeclarator - Called by ActOnDeclarator to check
9933 /// the well-formednes of the destructor declarator @p D with type @p
9934 /// R. If there are any errors in the declarator, this routine will
9935 /// emit diagnostics and set the declarator to invalid. Even if this happens,
9936 /// will be updated to reflect a well-formed type for the destructor and
9937 /// returned.
9938 QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R,
9939 StorageClass& SC) {
9940 // C++ [class.dtor]p1:
9941 // [...] A typedef-name that names a class is a class-name
9942 // (7.1.3); however, a typedef-name that names a class shall not
9943 // be used as the identifier in the declarator for a destructor
9944 // declaration.
9945 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName);
9946 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>())
9947 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
9948 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl());
9949 else if (const TemplateSpecializationType *TST =
9950 DeclaratorType->getAs<TemplateSpecializationType>())
9951 if (TST->isTypeAlias())
9952 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
9953 << DeclaratorType << 1;
9954
9955 // C++ [class.dtor]p2:
9956 // A destructor is used to destroy objects of its class type. A
9957 // destructor takes no parameters, and no return type can be
9958 // specified for it (not even void). The address of a destructor
9959 // shall not be taken. A destructor shall not be static. A
9960 // destructor can be invoked for a const, volatile or const
9961 // volatile object. A destructor shall not be declared const,
9962 // volatile or const volatile (9.3.2).
9963 if (SC == SC_Static) {
9964 if (!D.isInvalidType())
9965 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be)
9966 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
9967 << SourceRange(D.getIdentifierLoc())
9968 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
9969
9970 SC = SC_None;
9971 }
9972 if (!D.isInvalidType()) {
9973 // Destructors don't have return types, but the parser will
9974 // happily parse something like:
9975 //
9976 // class X {
9977 // float ~X();
9978 // };
9979 //
9980 // The return type will be eliminated later.
9981 if (D.getDeclSpec().hasTypeSpecifier())
9982 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type)
9983 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
9984 << SourceRange(D.getIdentifierLoc());
9985 else if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) {
9986 diagnoseIgnoredQualifiers(diag::err_destructor_return_type, TypeQuals,
9987 SourceLocation(),
9988 D.getDeclSpec().getConstSpecLoc(),
9989 D.getDeclSpec().getVolatileSpecLoc(),
9990 D.getDeclSpec().getRestrictSpecLoc(),
9991 D.getDeclSpec().getAtomicSpecLoc());
9992 D.setInvalidType();
9993 }
9994 }
9995
9996 checkMethodTypeQualifiers(*this, D, diag::err_invalid_qualified_destructor);
9997
9998 // C++0x [class.dtor]p2:
9999 // A destructor shall not be declared with a ref-qualifier.
10000 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
10001 if (FTI.hasRefQualifier()) {
10002 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor)
10003 << FTI.RefQualifierIsLValueRef
10004 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
10005 D.setInvalidType();
10006 }
10007
10008 // Make sure we don't have any parameters.
10009 if (FTIHasNonVoidParameters(FTI)) {
10010 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params);
10011
10012 // Delete the parameters.
10013 FTI.freeParams();
10014 D.setInvalidType();
10015 }
10016
10017 // Make sure the destructor isn't variadic.
10018 if (FTI.isVariadic) {
10019 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic);
10020 D.setInvalidType();
10021 }
10022
10023 // Rebuild the function type "R" without any type qualifiers or
10024 // parameters (in case any of the errors above fired) and with
10025 // "void" as the return type, since destructors don't have return
10026 // types.
10027 if (!D.isInvalidType())
10028 return R;
10029
10030 const FunctionProtoType *Proto = R->castAs<FunctionProtoType>();
10031 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
10032 EPI.Variadic = false;
10033 EPI.TypeQuals = Qualifiers();
10034 EPI.RefQualifier = RQ_None;
10035 return Context.getFunctionType(Context.VoidTy, None, EPI);
10036 }
10037
10038 static void extendLeft(SourceRange &R, SourceRange Before) {
10039 if (Before.isInvalid())
10040 return;
10041 R.setBegin(Before.getBegin());
10042 if (R.getEnd().isInvalid())
10043 R.setEnd(Before.getEnd());
10044 }
10045
10046 static void extendRight(SourceRange &R, SourceRange After) {
10047 if (After.isInvalid())
10048 return;
10049 if (R.getBegin().isInvalid())
10050 R.setBegin(After.getBegin());
10051 R.setEnd(After.getEnd());
10052 }
10053
10054 /// CheckConversionDeclarator - Called by ActOnDeclarator to check the
10055 /// well-formednes of the conversion function declarator @p D with
10056 /// type @p R. If there are any errors in the declarator, this routine
10057 /// will emit diagnostics and return true. Otherwise, it will return
10058 /// false. Either way, the type @p R will be updated to reflect a
10059 /// well-formed type for the conversion operator.
10060 void Sema::CheckConversionDeclarator(Declarator &D, QualType &R,
10061 StorageClass& SC) {
10062 // C++ [class.conv.fct]p1:
10063 // Neither parameter types nor return type can be specified. The
10064 // type of a conversion function (8.3.5) is "function taking no
10065 // parameter returning conversion-type-id."
10066 if (SC == SC_Static) {
10067 if (!D.isInvalidType())
10068 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member)
10069 << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
10070 << D.getName().getSourceRange();
10071 D.setInvalidType();
10072 SC = SC_None;
10073 }
10074
10075 TypeSourceInfo *ConvTSI = nullptr;
10076 QualType ConvType =
10077 GetTypeFromParser(D.getName().ConversionFunctionId, &ConvTSI);
10078
10079 const DeclSpec &DS = D.getDeclSpec();
10080 if (DS.hasTypeSpecifier() && !D.isInvalidType()) {
10081 // Conversion functions don't have return types, but the parser will
10082 // happily parse something like:
10083 //
10084 // class X {
10085 // float operator bool();
10086 // };
10087 //
10088 // The return type will be changed later anyway.
10089 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type)
10090 << SourceRange(DS.getTypeSpecTypeLoc())
10091 << SourceRange(D.getIdentifierLoc());
10092 D.setInvalidType();
10093 } else if (DS.getTypeQualifiers() && !D.isInvalidType()) {
10094 // It's also plausible that the user writes type qualifiers in the wrong
10095 // place, such as:
10096 // struct S { const operator int(); };
10097 // FIXME: we could provide a fixit to move the qualifiers onto the
10098 // conversion type.
10099 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl)
10100 << SourceRange(D.getIdentifierLoc()) << 0;
10101 D.setInvalidType();
10102 }
10103
10104 const auto *Proto = R->castAs<FunctionProtoType>();
10105
10106 // Make sure we don't have any parameters.
10107 if (Proto->getNumParams() > 0) {
10108 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params);
10109
10110 // Delete the parameters.
10111 D.getFunctionTypeInfo().freeParams();
10112 D.setInvalidType();
10113 } else if (Proto->isVariadic()) {
10114 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic);
10115 D.setInvalidType();
10116 }
10117
10118 // Diagnose "&operator bool()" and other such nonsense. This
10119 // is actually a gcc extension which we don't support.
10120 if (Proto->getReturnType() != ConvType) {
10121 bool NeedsTypedef = false;
10122 SourceRange Before, After;
10123
10124 // Walk the chunks and extract information on them for our diagnostic.
10125 bool PastFunctionChunk = false;
10126 for (auto &Chunk : D.type_objects()) {
10127 switch (Chunk.Kind) {
10128 case DeclaratorChunk::Function:
10129 if (!PastFunctionChunk) {
10130 if (Chunk.Fun.HasTrailingReturnType) {
10131 TypeSourceInfo *TRT = nullptr;
10132 GetTypeFromParser(Chunk.Fun.getTrailingReturnType(), &TRT);
10133 if (TRT) extendRight(After, TRT->getTypeLoc().getSourceRange());
10134 }
10135 PastFunctionChunk = true;
10136 break;
10137 }
10138 LLVM_FALLTHROUGH;
10139 case DeclaratorChunk::Array:
10140 NeedsTypedef = true;
10141 extendRight(After, Chunk.getSourceRange());
10142 break;
10143
10144 case DeclaratorChunk::Pointer:
10145 case DeclaratorChunk::BlockPointer:
10146 case DeclaratorChunk::Reference:
10147 case DeclaratorChunk::MemberPointer:
10148 case DeclaratorChunk::Pipe:
10149 extendLeft(Before, Chunk.getSourceRange());
10150 break;
10151
10152 case DeclaratorChunk::Paren:
10153 extendLeft(Before, Chunk.Loc);
10154 extendRight(After, Chunk.EndLoc);
10155 break;
10156 }
10157 }
10158
10159 SourceLocation Loc = Before.isValid() ? Before.getBegin() :
10160 After.isValid() ? After.getBegin() :
10161 D.getIdentifierLoc();
10162 auto &&DB = Diag(Loc, diag::err_conv_function_with_complex_decl);
10163 DB << Before << After;
10164
10165 if (!NeedsTypedef) {
10166 DB << /*don't need a typedef*/0;
10167
10168 // If we can provide a correct fix-it hint, do so.
10169 if (After.isInvalid() && ConvTSI) {
10170 SourceLocation InsertLoc =
10171 getLocForEndOfToken(ConvTSI->getTypeLoc().getEndLoc());
10172 DB << FixItHint::CreateInsertion(InsertLoc, " ")
10173 << FixItHint::CreateInsertionFromRange(
10174 InsertLoc, CharSourceRange::getTokenRange(Before))
10175 << FixItHint::CreateRemoval(Before);
10176 }
10177 } else if (!Proto->getReturnType()->isDependentType()) {
10178 DB << /*typedef*/1 << Proto->getReturnType();
10179 } else if (getLangOpts().CPlusPlus11) {
10180 DB << /*alias template*/2 << Proto->getReturnType();
10181 } else {
10182 DB << /*might not be fixable*/3;
10183 }
10184
10185 // Recover by incorporating the other type chunks into the result type.
10186 // Note, this does *not* change the name of the function. This is compatible
10187 // with the GCC extension:
10188 // struct S { &operator int(); } s;
10189 // int &r = s.operator int(); // ok in GCC
10190 // S::operator int&() {} // error in GCC, function name is 'operator int'.
10191 ConvType = Proto->getReturnType();
10192 }
10193
10194 // C++ [class.conv.fct]p4:
10195 // The conversion-type-id shall not represent a function type nor
10196 // an array type.
10197 if (ConvType->isArrayType()) {
10198 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array);
10199 ConvType = Context.getPointerType(ConvType);
10200 D.setInvalidType();
10201 } else if (ConvType->isFunctionType()) {
10202 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function);
10203 ConvType = Context.getPointerType(ConvType);
10204 D.setInvalidType();
10205 }
10206
10207 // Rebuild the function type "R" without any parameters (in case any
10208 // of the errors above fired) and with the conversion type as the
10209 // return type.
10210 if (D.isInvalidType())
10211 R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo());
10212
10213 // C++0x explicit conversion operators.
10214 if (DS.hasExplicitSpecifier() && !getLangOpts().CPlusPlus2a)
10215 Diag(DS.getExplicitSpecLoc(),
10216 getLangOpts().CPlusPlus11
10217 ? diag::warn_cxx98_compat_explicit_conversion_functions
10218 : diag::ext_explicit_conversion_functions)
10219 << SourceRange(DS.getExplicitSpecRange());
10220 }
10221
10222 /// ActOnConversionDeclarator - Called by ActOnDeclarator to complete
10223 /// the declaration of the given C++ conversion function. This routine
10224 /// is responsible for recording the conversion function in the C++
10225 /// class, if possible.
10226 Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) {
10227 assert(Conversion && "Expected to receive a conversion function declaration");
10228
10229 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext());
10230
10231 // Make sure we aren't redeclaring the conversion function.
10232 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType());
10233
10234 // C++ [class.conv.fct]p1:
10235 // [...] A conversion function is never used to convert a
10236 // (possibly cv-qualified) object to the (possibly cv-qualified)
10237 // same object type (or a reference to it), to a (possibly
10238 // cv-qualified) base class of that type (or a reference to it),
10239 // or to (possibly cv-qualified) void.
10240 // FIXME: Suppress this warning if the conversion function ends up being a
10241 // virtual function that overrides a virtual function in a base class.
10242 QualType ClassType
10243 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
10244 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>())
10245 ConvType = ConvTypeRef->getPointeeType();
10246 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared &&
10247 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization)
10248 /* Suppress diagnostics for instantiations. */;
10249 else if (ConvType->isRecordType()) {
10250 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType();
10251 if (ConvType == ClassType)
10252 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used)
10253 << ClassType;
10254 else if (IsDerivedFrom(Conversion->getLocation(), ClassType, ConvType))
10255 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used)
10256 << ClassType << ConvType;
10257 } else if (ConvType->isVoidType()) {
10258 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used)
10259 << ClassType << ConvType;
10260 }
10261
10262 if (FunctionTemplateDecl *ConversionTemplate
10263 = Conversion->getDescribedFunctionTemplate())
10264 return ConversionTemplate;
10265
10266 return Conversion;
10267 }
10268
10269 namespace {
10270 /// Utility class to accumulate and print a diagnostic listing the invalid
10271 /// specifier(s) on a declaration.
10272 struct BadSpecifierDiagnoser {
10273 BadSpecifierDiagnoser(Sema &S, SourceLocation Loc, unsigned DiagID)
10274 : S(S), Diagnostic(S.Diag(Loc, DiagID)) {}
10275 ~BadSpecifierDiagnoser() {
10276 Diagnostic << Specifiers;
10277 }
10278
10279 template<typename T> void check(SourceLocation SpecLoc, T Spec) {
10280 return check(SpecLoc, DeclSpec::getSpecifierName(Spec));
10281 }
10282 void check(SourceLocation SpecLoc, DeclSpec::TST Spec) {
10283 return check(SpecLoc,
10284 DeclSpec::getSpecifierName(Spec, S.getPrintingPolicy()));
10285 }
10286 void check(SourceLocation SpecLoc, const char *Spec) {
10287 if (SpecLoc.isInvalid()) return;
10288 Diagnostic << SourceRange(SpecLoc, SpecLoc);
10289 if (!Specifiers.empty()) Specifiers += " ";
10290 Specifiers += Spec;
10291 }
10292
10293 Sema &S;
10294 Sema::SemaDiagnosticBuilder Diagnostic;
10295 std::string Specifiers;
10296 };
10297 }
10298
10299 /// Check the validity of a declarator that we parsed for a deduction-guide.
10300 /// These aren't actually declarators in the grammar, so we need to check that
10301 /// the user didn't specify any pieces that are not part of the deduction-guide
10302 /// grammar.
10303 void Sema::CheckDeductionGuideDeclarator(Declarator &D, QualType &R,
10304 StorageClass &SC) {
10305 TemplateName GuidedTemplate = D.getName().TemplateName.get().get();
10306 TemplateDecl *GuidedTemplateDecl = GuidedTemplate.getAsTemplateDecl();
10307 assert(GuidedTemplateDecl && "missing template decl for deduction guide");
10308
10309 // C++ [temp.deduct.guide]p3:
10310 // A deduction-gide shall be declared in the same scope as the
10311 // corresponding class template.
10312 if (!CurContext->getRedeclContext()->Equals(
10313 GuidedTemplateDecl->getDeclContext()->getRedeclContext())) {
10314 Diag(D.getIdentifierLoc(), diag::err_deduction_guide_wrong_scope)
10315 << GuidedTemplateDecl;
10316 Diag(GuidedTemplateDecl->getLocation(), diag::note_template_decl_here);
10317 }
10318
10319 auto &DS = D.getMutableDeclSpec();
10320 // We leave 'friend' and 'virtual' to be rejected in the normal way.
10321 if (DS.hasTypeSpecifier() || DS.getTypeQualifiers() ||
10322 DS.getStorageClassSpecLoc().isValid() || DS.isInlineSpecified() ||
10323 DS.isNoreturnSpecified() || DS.hasConstexprSpecifier()) {
10324 BadSpecifierDiagnoser Diagnoser(
10325 *this, D.getIdentifierLoc(),
10326 diag::err_deduction_guide_invalid_specifier);
10327
10328 Diagnoser.check(DS.getStorageClassSpecLoc(), DS.getStorageClassSpec());
10329 DS.ClearStorageClassSpecs();
10330 SC = SC_None;
10331
10332 // 'explicit' is permitted.
10333 Diagnoser.check(DS.getInlineSpecLoc(), "inline");
10334 Diagnoser.check(DS.getNoreturnSpecLoc(), "_Noreturn");
10335 Diagnoser.check(DS.getConstexprSpecLoc(), "constexpr");
10336 DS.ClearConstexprSpec();
10337
10338 Diagnoser.check(DS.getConstSpecLoc(), "const");
10339 Diagnoser.check(DS.getRestrictSpecLoc(), "__restrict");
10340 Diagnoser.check(DS.getVolatileSpecLoc(), "volatile");
10341 Diagnoser.check(DS.getAtomicSpecLoc(), "_Atomic");
10342 Diagnoser.check(DS.getUnalignedSpecLoc(), "__unaligned");
10343 DS.ClearTypeQualifiers();
10344
10345 Diagnoser.check(DS.getTypeSpecComplexLoc(), DS.getTypeSpecComplex());
10346 Diagnoser.check(DS.getTypeSpecSignLoc(), DS.getTypeSpecSign());
10347 Diagnoser.check(DS.getTypeSpecWidthLoc(), DS.getTypeSpecWidth());
10348 Diagnoser.check(DS.getTypeSpecTypeLoc(), DS.getTypeSpecType());
10349 DS.ClearTypeSpecType();
10350 }
10351
10352 if (D.isInvalidType())
10353 return;
10354
10355 // Check the declarator is simple enough.
10356 bool FoundFunction = false;
10357 for (const DeclaratorChunk &Chunk : llvm::reverse(D.type_objects())) {
10358 if (Chunk.Kind == DeclaratorChunk::Paren)
10359 continue;
10360 if (Chunk.Kind != DeclaratorChunk::Function || FoundFunction) {
10361 Diag(D.getDeclSpec().getBeginLoc(),
10362 diag::err_deduction_guide_with_complex_decl)
10363 << D.getSourceRange();
10364 break;
10365 }
10366 if (!Chunk.Fun.hasTrailingReturnType()) {
10367 Diag(D.getName().getBeginLoc(),
10368 diag::err_deduction_guide_no_trailing_return_type);
10369 break;
10370 }
10371
10372 // Check that the return type is written as a specialization of
10373 // the template specified as the deduction-guide's name.
10374 ParsedType TrailingReturnType = Chunk.Fun.getTrailingReturnType();
10375 TypeSourceInfo *TSI = nullptr;
10376 QualType RetTy = GetTypeFromParser(TrailingReturnType, &TSI);
10377 assert(TSI && "deduction guide has valid type but invalid return type?");
10378 bool AcceptableReturnType = false;
10379 bool MightInstantiateToSpecialization = false;
10380 if (auto RetTST =
10381 TSI->getTypeLoc().getAs<TemplateSpecializationTypeLoc>()) {
10382 TemplateName SpecifiedName = RetTST.getTypePtr()->getTemplateName();
10383 bool TemplateMatches =
10384 Context.hasSameTemplateName(SpecifiedName, GuidedTemplate);
10385 if (SpecifiedName.getKind() == TemplateName::Template && TemplateMatches)
10386 AcceptableReturnType = true;
10387 else {
10388 // This could still instantiate to the right type, unless we know it
10389 // names the wrong class template.
10390 auto *TD = SpecifiedName.getAsTemplateDecl();
10391 MightInstantiateToSpecialization = !(TD && isa<ClassTemplateDecl>(TD) &&
10392 !TemplateMatches);
10393 }
10394 } else if (!RetTy.hasQualifiers() && RetTy->isDependentType()) {
10395 MightInstantiateToSpecialization = true;
10396 }
10397
10398 if (!AcceptableReturnType) {
10399 Diag(TSI->getTypeLoc().getBeginLoc(),
10400 diag::err_deduction_guide_bad_trailing_return_type)
10401 << GuidedTemplate << TSI->getType()
10402 << MightInstantiateToSpecialization
10403 << TSI->getTypeLoc().getSourceRange();
10404 }
10405
10406 // Keep going to check that we don't have any inner declarator pieces (we
10407 // could still have a function returning a pointer to a function).
10408 FoundFunction = true;
10409 }
10410
10411 if (D.isFunctionDefinition())
10412 Diag(D.getIdentifierLoc(), diag::err_deduction_guide_defines_function);
10413 }
10414
10415 //===----------------------------------------------------------------------===//
10416 // Namespace Handling
10417 //===----------------------------------------------------------------------===//
10418
10419 /// Diagnose a mismatch in 'inline' qualifiers when a namespace is
10420 /// reopened.
10421 static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc,
10422 SourceLocation Loc,
10423 IdentifierInfo *II, bool *IsInline,
10424 NamespaceDecl *PrevNS) {
10425 assert(*IsInline != PrevNS->isInline());
10426
10427 // HACK: Work around a bug in libstdc++4.6's <atomic>, where
10428 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as
10429 // inline namespaces, with the intention of bringing names into namespace std.
10430 //
10431 // We support this just well enough to get that case working; this is not
10432 // sufficient to support reopening namespaces as inline in general.
10433 if (*IsInline && II && II->getName().startswith("__atomic") &&
10434 S.getSourceManager().isInSystemHeader(Loc)) {
10435 // Mark all prior declarations of the namespace as inline.
10436 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS;
10437 NS = NS->getPreviousDecl())
10438 NS->setInline(*IsInline);
10439 // Patch up the lookup table for the containing namespace. This isn't really
10440 // correct, but it's good enough for this particular case.
10441 for (auto *I : PrevNS->decls())
10442 if (auto *ND = dyn_cast<NamedDecl>(I))
10443 PrevNS->getParent()->makeDeclVisibleInContext(ND);
10444 return;
10445 }
10446
10447 if (PrevNS->isInline())
10448 // The user probably just forgot the 'inline', so suggest that it
10449 // be added back.
10450 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline)
10451 << FixItHint::CreateInsertion(KeywordLoc, "inline ");
10452 else
10453 S.Diag(Loc, diag::err_inline_namespace_mismatch);
10454
10455 S.Diag(PrevNS->getLocation(), diag::note_previous_definition);
10456 *IsInline = PrevNS->isInline();
10457 }
10458
10459 /// ActOnStartNamespaceDef - This is called at the start of a namespace
10460 /// definition.
10461 Decl *Sema::ActOnStartNamespaceDef(
10462 Scope *NamespcScope, SourceLocation InlineLoc, SourceLocation NamespaceLoc,
10463 SourceLocation IdentLoc, IdentifierInfo *II, SourceLocation LBrace,
10464 const ParsedAttributesView &AttrList, UsingDirectiveDecl *&UD) {
10465 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc;
10466 // For anonymous namespace, take the location of the left brace.
10467 SourceLocation Loc = II ? IdentLoc : LBrace;
10468 bool IsInline = InlineLoc.isValid();
10469 bool IsInvalid = false;
10470 bool IsStd = false;
10471 bool AddToKnown = false;
10472 Scope *DeclRegionScope = NamespcScope->getParent();
10473
10474 NamespaceDecl *PrevNS = nullptr;
10475 if (II) {
10476 // C++ [namespace.def]p2:
10477 // The identifier in an original-namespace-definition shall not
10478 // have been previously defined in the declarative region in
10479 // which the original-namespace-definition appears. The
10480 // identifier in an original-namespace-definition is the name of
10481 // the namespace. Subsequently in that declarative region, it is
10482 // treated as an original-namespace-name.
10483 //
10484 // Since namespace names are unique in their scope, and we don't
10485 // look through using directives, just look for any ordinary names
10486 // as if by qualified name lookup.
10487 LookupResult R(*this, II, IdentLoc, LookupOrdinaryName,
10488 ForExternalRedeclaration);
10489 LookupQualifiedName(R, CurContext->getRedeclContext());
10490 NamedDecl *PrevDecl =
10491 R.isSingleResult() ? R.getRepresentativeDecl() : nullptr;
10492 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl);
10493
10494 if (PrevNS) {
10495 // This is an extended namespace definition.
10496 if (IsInline != PrevNS->isInline())
10497 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II,
10498 &IsInline, PrevNS);
10499 } else if (PrevDecl) {
10500 // This is an invalid name redefinition.
10501 Diag(Loc, diag::err_redefinition_different_kind)
10502 << II;
10503 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
10504 IsInvalid = true;
10505 // Continue on to push Namespc as current DeclContext and return it.
10506 } else if (II->isStr("std") &&
10507 CurContext->getRedeclContext()->isTranslationUnit()) {
10508 // This is the first "real" definition of the namespace "std", so update
10509 // our cache of the "std" namespace to point at this definition.
10510 PrevNS = getStdNamespace();
10511 IsStd = true;
10512 AddToKnown = !IsInline;
10513 } else {
10514 // We've seen this namespace for the first time.
10515 AddToKnown = !IsInline;
10516 }
10517 } else {
10518 // Anonymous namespaces.
10519
10520 // Determine whether the parent already has an anonymous namespace.
10521 DeclContext *Parent = CurContext->getRedeclContext();
10522 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
10523 PrevNS = TU->getAnonymousNamespace();
10524 } else {
10525 NamespaceDecl *ND = cast<NamespaceDecl>(Parent);
10526 PrevNS = ND->getAnonymousNamespace();
10527 }
10528
10529 if (PrevNS && IsInline != PrevNS->isInline())
10530 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II,
10531 &IsInline, PrevNS);
10532 }
10533
10534 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline,
10535 StartLoc, Loc, II, PrevNS);
10536 if (IsInvalid)
10537 Namespc->setInvalidDecl();
10538
10539 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList);
10540 AddPragmaAttributes(DeclRegionScope, Namespc);
10541
10542 // FIXME: Should we be merging attributes?
10543 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>())
10544 PushNamespaceVisibilityAttr(Attr, Loc);
10545
10546 if (IsStd)
10547 StdNamespace = Namespc;
10548 if (AddToKnown)
10549 KnownNamespaces[Namespc] = false;
10550
10551 if (II) {
10552 PushOnScopeChains(Namespc, DeclRegionScope);
10553 } else {
10554 // Link the anonymous namespace into its parent.
10555 DeclContext *Parent = CurContext->getRedeclContext();
10556 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
10557 TU->setAnonymousNamespace(Namespc);
10558 } else {
10559 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc);
10560 }
10561
10562 CurContext->addDecl(Namespc);
10563
10564 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition
10565 // behaves as if it were replaced by
10566 // namespace unique { /* empty body */ }
10567 // using namespace unique;
10568 // namespace unique { namespace-body }
10569 // where all occurrences of 'unique' in a translation unit are
10570 // replaced by the same identifier and this identifier differs
10571 // from all other identifiers in the entire program.
10572
10573 // We just create the namespace with an empty name and then add an
10574 // implicit using declaration, just like the standard suggests.
10575 //
10576 // CodeGen enforces the "universally unique" aspect by giving all
10577 // declarations semantically contained within an anonymous
10578 // namespace internal linkage.
10579
10580 if (!PrevNS) {
10581 UD = UsingDirectiveDecl::Create(Context, Parent,
10582 /* 'using' */ LBrace,
10583 /* 'namespace' */ SourceLocation(),
10584 /* qualifier */ NestedNameSpecifierLoc(),
10585 /* identifier */ SourceLocation(),
10586 Namespc,
10587 /* Ancestor */ Parent);
10588 UD->setImplicit();
10589 Parent->addDecl(UD);
10590 }
10591 }
10592
10593 ActOnDocumentableDecl(Namespc);
10594
10595 // Although we could have an invalid decl (i.e. the namespace name is a
10596 // redefinition), push it as current DeclContext and try to continue parsing.
10597 // FIXME: We should be able to push Namespc here, so that the each DeclContext
10598 // for the namespace has the declarations that showed up in that particular
10599 // namespace definition.
10600 PushDeclContext(NamespcScope, Namespc);
10601 return Namespc;
10602 }
10603
10604 /// getNamespaceDecl - Returns the namespace a decl represents. If the decl
10605 /// is a namespace alias, returns the namespace it points to.
10606 static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) {
10607 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D))
10608 return AD->getNamespace();
10609 return dyn_cast_or_null<NamespaceDecl>(D);
10610 }
10611
10612 /// ActOnFinishNamespaceDef - This callback is called after a namespace is
10613 /// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef.
10614 void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) {
10615 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl);
10616 assert(Namespc && "Invalid parameter, expected NamespaceDecl");
10617 Namespc->setRBraceLoc(RBrace);
10618 PopDeclContext();
10619 if (Namespc->hasAttr<VisibilityAttr>())
10620 PopPragmaVisibility(true, RBrace);
10621 // If this namespace contains an export-declaration, export it now.
10622 if (DeferredExportedNamespaces.erase(Namespc))
10623 Dcl->setModuleOwnershipKind(Decl::ModuleOwnershipKind::VisibleWhenImported);
10624 }
10625
10626 CXXRecordDecl *Sema::getStdBadAlloc() const {
10627 return cast_or_null<CXXRecordDecl>(
10628 StdBadAlloc.get(Context.getExternalSource()));
10629 }
10630
10631 EnumDecl *Sema::getStdAlignValT() const {
10632 return cast_or_null<EnumDecl>(StdAlignValT.get(Context.getExternalSource()));
10633 }
10634
10635 NamespaceDecl *Sema::getStdNamespace() const {
10636 return cast_or_null<NamespaceDecl>(
10637 StdNamespace.get(Context.getExternalSource()));
10638 }
10639
10640 NamespaceDecl *Sema::lookupStdExperimentalNamespace() {
10641 if (!StdExperimentalNamespaceCache) {
10642 if (auto Std = getStdNamespace()) {
10643 LookupResult Result(*this, &PP.getIdentifierTable().get("experimental"),
10644 SourceLocation(), LookupNamespaceName);
10645 if (!LookupQualifiedName(Result, Std) ||
10646 !(StdExperimentalNamespaceCache =
10647 Result.getAsSingle<NamespaceDecl>()))
10648 Result.suppressDiagnostics();
10649 }
10650 }
10651 return StdExperimentalNamespaceCache;
10652 }
10653
10654 namespace {
10655
10656 enum UnsupportedSTLSelect {
10657 USS_InvalidMember,
10658 USS_MissingMember,
10659 USS_NonTrivial,
10660 USS_Other
10661 };
10662
10663 struct InvalidSTLDiagnoser {
10664 Sema &S;
10665 SourceLocation Loc;
10666 QualType TyForDiags;
10667
10668 QualType operator()(UnsupportedSTLSelect Sel = USS_Other, StringRef Name = "",
10669 const VarDecl *VD = nullptr) {
10670 {
10671 auto D = S.Diag(Loc, diag::err_std_compare_type_not_supported)
10672 << TyForDiags << ((int)Sel);
10673 if (Sel == USS_InvalidMember || Sel == USS_MissingMember) {
10674 assert(!Name.empty());
10675 D << Name;
10676 }
10677 }
10678 if (Sel == USS_InvalidMember) {
10679 S.Diag(VD->getLocation(), diag::note_var_declared_here)
10680 << VD << VD->getSourceRange();
10681 }
10682 return QualType();
10683 }
10684 };
10685 } // namespace
10686
10687 QualType Sema::CheckComparisonCategoryType(ComparisonCategoryType Kind,
10688 SourceLocation Loc,
10689 ComparisonCategoryUsage Usage) {
10690 assert(getLangOpts().CPlusPlus &&
10691 "Looking for comparison category type outside of C++.");
10692
10693 // Use an elaborated type for diagnostics which has a name containing the
10694 // prepended 'std' namespace but not any inline namespace names.
10695 auto TyForDiags = [&](ComparisonCategoryInfo *Info) {
10696 auto *NNS =
10697 NestedNameSpecifier::Create(Context, nullptr, getStdNamespace());
10698 return Context.getElaboratedType(ETK_None, NNS, Info->getType());
10699 };
10700
10701 // Check if we've already successfully checked the comparison category type
10702 // before. If so, skip checking it again.
10703 ComparisonCategoryInfo *Info = Context.CompCategories.lookupInfo(Kind);
10704 if (Info && FullyCheckedComparisonCategories[static_cast<unsigned>(Kind)]) {
10705 // The only thing we need to check is that the type has a reachable
10706 // definition in the current context.
10707 if (RequireCompleteType(Loc, TyForDiags(Info), diag::err_incomplete_type))
10708 return QualType();
10709
10710 return Info->getType();
10711 }
10712
10713 // If lookup failed
10714 if (!Info) {
10715 std::string NameForDiags = "std::";
10716 NameForDiags += ComparisonCategories::getCategoryString(Kind);
10717 Diag(Loc, diag::err_implied_comparison_category_type_not_found)
10718 << NameForDiags << (int)Usage;
10719 return QualType();
10720 }
10721
10722 assert(Info->Kind == Kind);
10723 assert(Info->Record);
10724
10725 // Update the Record decl in case we encountered a forward declaration on our
10726 // first pass. FIXME: This is a bit of a hack.
10727 if (Info->Record->hasDefinition())
10728 Info->Record = Info->Record->getDefinition();
10729
10730 if (RequireCompleteType(Loc, TyForDiags(Info), diag::err_incomplete_type))
10731 return QualType();
10732
10733 InvalidSTLDiagnoser UnsupportedSTLError{*this, Loc, TyForDiags(Info)};
10734
10735 if (!Info->Record->isTriviallyCopyable())
10736 return UnsupportedSTLError(USS_NonTrivial);
10737
10738 for (const CXXBaseSpecifier &BaseSpec : Info->Record->bases()) {
10739 CXXRecordDecl *Base = BaseSpec.getType()->getAsCXXRecordDecl();
10740 // Tolerate empty base classes.
10741 if (Base->isEmpty())
10742 continue;
10743 // Reject STL implementations which have at least one non-empty base.
10744 return UnsupportedSTLError();
10745 }
10746
10747 // Check that the STL has implemented the types using a single integer field.
10748 // This expectation allows better codegen for builtin operators. We require:
10749 // (1) The class has exactly one field.
10750 // (2) The field is an integral or enumeration type.
10751 auto FIt = Info->Record->field_begin(), FEnd = Info->Record->field_end();
10752 if (std::distance(FIt, FEnd) != 1 ||
10753 !FIt->getType()->isIntegralOrEnumerationType()) {
10754 return UnsupportedSTLError();
10755 }
10756
10757 // Build each of the require values and store them in Info.
10758 for (ComparisonCategoryResult CCR :
10759 ComparisonCategories::getPossibleResultsForType(Kind)) {
10760 StringRef MemName = ComparisonCategories::getResultString(CCR);
10761 ComparisonCategoryInfo::ValueInfo *ValInfo = Info->lookupValueInfo(CCR);
10762
10763 if (!ValInfo)
10764 return UnsupportedSTLError(USS_MissingMember, MemName);
10765
10766 VarDecl *VD = ValInfo->VD;
10767 assert(VD && "should not be null!");
10768
10769 // Attempt to diagnose reasons why the STL definition of this type
10770 // might be foobar, including it failing to be a constant expression.
10771 // TODO Handle more ways the lookup or result can be invalid.
10772 if (!VD->isStaticDataMember() || !VD->isConstexpr() || !VD->hasInit() ||
10773 !VD->checkInitIsICE())
10774 return UnsupportedSTLError(USS_InvalidMember, MemName, VD);
10775
10776 // Attempt to evaluate the var decl as a constant expression and extract
10777 // the value of its first field as a ICE. If this fails, the STL
10778 // implementation is not supported.
10779 if (!ValInfo->hasValidIntValue())
10780 return UnsupportedSTLError();
10781
10782 MarkVariableReferenced(Loc, VD);
10783 }
10784
10785 // We've successfully built the required types and expressions. Update
10786 // the cache and return the newly cached value.
10787 FullyCheckedComparisonCategories[static_cast<unsigned>(Kind)] = true;
10788 return Info->getType();
10789 }
10790
10791 /// Retrieve the special "std" namespace, which may require us to
10792 /// implicitly define the namespace.
10793 NamespaceDecl *Sema::getOrCreateStdNamespace() {
10794 if (!StdNamespace) {
10795 // The "std" namespace has not yet been defined, so build one implicitly.
10796 StdNamespace = NamespaceDecl::Create(Context,
10797 Context.getTranslationUnitDecl(),
10798 /*Inline=*/false,
10799 SourceLocation(), SourceLocation(),
10800 &PP.getIdentifierTable().get("std"),
10801 /*PrevDecl=*/nullptr);
10802 getStdNamespace()->setImplicit(true);
10803 }
10804
10805 return getStdNamespace();
10806 }
10807
10808 bool Sema::isStdInitializerList(QualType Ty, QualType *Element) {
10809 assert(getLangOpts().CPlusPlus &&
10810 "Looking for std::initializer_list outside of C++.");
10811
10812 // We're looking for implicit instantiations of
10813 // template <typename E> class std::initializer_list.
10814
10815 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it.
10816 return false;
10817
10818 ClassTemplateDecl *Template = nullptr;
10819 const TemplateArgument *Arguments = nullptr;
10820
10821 if (const RecordType *RT = Ty->getAs<RecordType>()) {
10822
10823 ClassTemplateSpecializationDecl *Specialization =
10824 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl());
10825 if (!Specialization)
10826 return false;
10827
10828 Template = Specialization->getSpecializedTemplate();
10829 Arguments = Specialization->getTemplateArgs().data();
10830 } else if (const TemplateSpecializationType *TST =
10831 Ty->getAs<TemplateSpecializationType>()) {
10832 Template = dyn_cast_or_null<ClassTemplateDecl>(
10833 TST->getTemplateName().getAsTemplateDecl());
10834 Arguments = TST->getArgs();
10835 }
10836 if (!Template)
10837 return false;
10838
10839 if (!StdInitializerList) {
10840 // Haven't recognized std::initializer_list yet, maybe this is it.
10841 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl();
10842 if (TemplateClass->getIdentifier() !=
10843 &PP.getIdentifierTable().get("initializer_list") ||
10844 !getStdNamespace()->InEnclosingNamespaceSetOf(
10845 TemplateClass->getDeclContext()))
10846 return false;
10847 // This is a template called std::initializer_list, but is it the right
10848 // template?
10849 TemplateParameterList *Params = Template->getTemplateParameters();
10850 if (Params->getMinRequiredArguments() != 1)
10851 return false;
10852 if (!isa<TemplateTypeParmDecl>(Params->getParam(0)))
10853 return false;
10854
10855 // It's the right template.
10856 StdInitializerList = Template;
10857 }
10858
10859 if (Template->getCanonicalDecl() != StdInitializerList->getCanonicalDecl())
10860 return false;
10861
10862 // This is an instance of std::initializer_list. Find the argument type.
10863 if (Element)
10864 *Element = Arguments[0].getAsType();
10865 return true;
10866 }
10867
10868 static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){
10869 NamespaceDecl *Std = S.getStdNamespace();
10870 if (!Std) {
10871 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found);
10872 return nullptr;
10873 }
10874
10875 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"),
10876 Loc, Sema::LookupOrdinaryName);
10877 if (!S.LookupQualifiedName(Result, Std)) {
10878 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found);
10879 return nullptr;
10880 }
10881 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>();
10882 if (!Template) {
10883 Result.suppressDiagnostics();
10884 // We found something weird. Complain about the first thing we found.
10885 NamedDecl *Found = *Result.begin();
10886 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list);
10887 return nullptr;
10888 }
10889
10890 // We found some template called std::initializer_list. Now verify that it's
10891 // correct.
10892 TemplateParameterList *Params = Template->getTemplateParameters();
10893 if (Params->getMinRequiredArguments() != 1 ||
10894 !isa<TemplateTypeParmDecl>(Params->getParam(0))) {
10895 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list);
10896 return nullptr;
10897 }
10898
10899 return Template;
10900 }
10901
10902 QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) {
10903 if (!StdInitializerList) {
10904 StdInitializerList = LookupStdInitializerList(*this, Loc);
10905 if (!StdInitializerList)
10906 return QualType();
10907 }
10908
10909 TemplateArgumentListInfo Args(Loc, Loc);
10910 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element),
10911 Context.getTrivialTypeSourceInfo(Element,
10912 Loc)));
10913 return Context.getCanonicalType(
10914 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args));
10915 }
10916
10917 bool Sema::isInitListConstructor(const FunctionDecl *Ctor) {
10918 // C++ [dcl.init.list]p2:
10919 // A constructor is an initializer-list constructor if its first parameter
10920 // is of type std::initializer_list<E> or reference to possibly cv-qualified
10921 // std::initializer_list<E> for some type E, and either there are no other
10922 // parameters or else all other parameters have default arguments.
10923 if (Ctor->getNumParams() < 1 ||
10924 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg()))
10925 return false;
10926
10927 QualType ArgType = Ctor->getParamDecl(0)->getType();
10928 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>())
10929 ArgType = RT->getPointeeType().getUnqualifiedType();
10930
10931 return isStdInitializerList(ArgType, nullptr);
10932 }
10933
10934 /// Determine whether a using statement is in a context where it will be
10935 /// apply in all contexts.
10936 static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) {
10937 switch (CurContext->getDeclKind()) {
10938 case Decl::TranslationUnit:
10939 return true;
10940 case Decl::LinkageSpec:
10941 return IsUsingDirectiveInToplevelContext(CurContext->getParent());
10942 default:
10943 return false;
10944 }
10945 }
10946
10947 namespace {
10948
10949 // Callback to only accept typo corrections that are namespaces.
10950 class NamespaceValidatorCCC final : public CorrectionCandidateCallback {
10951 public:
10952 bool ValidateCandidate(const TypoCorrection &candidate) override {
10953 if (NamedDecl *ND = candidate.getCorrectionDecl())
10954 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND);
10955 return false;
10956 }
10957
10958 std::unique_ptr<CorrectionCandidateCallback> clone() override {
10959 return std::make_unique<NamespaceValidatorCCC>(*this);
10960 }
10961 };
10962
10963 }
10964
10965 static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc,
10966 CXXScopeSpec &SS,
10967 SourceLocation IdentLoc,
10968 IdentifierInfo *Ident) {
10969 R.clear();
10970 NamespaceValidatorCCC CCC{};
10971 if (TypoCorrection Corrected =
10972 S.CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), Sc, &SS, CCC,
10973 Sema::CTK_ErrorRecovery)) {
10974 if (DeclContext *DC = S.computeDeclContext(SS, false)) {
10975 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts()));
10976 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
10977 Ident->getName().equals(CorrectedStr);
10978 S.diagnoseTypo(Corrected,
10979 S.PDiag(diag::err_using_directive_member_suggest)
10980 << Ident << DC << DroppedSpecifier << SS.getRange(),
10981 S.PDiag(diag::note_namespace_defined_here));
10982 } else {
10983 S.diagnoseTypo(Corrected,
10984 S.PDiag(diag::err_using_directive_suggest) << Ident,
10985 S.PDiag(diag::note_namespace_defined_here));
10986 }
10987 R.addDecl(Corrected.getFoundDecl());
10988 return true;
10989 }
10990 return false;
10991 }
10992
10993 Decl *Sema::ActOnUsingDirective(Scope *S, SourceLocation UsingLoc,
10994 SourceLocation NamespcLoc, CXXScopeSpec &SS,
10995 SourceLocation IdentLoc,
10996 IdentifierInfo *NamespcName,
10997 const ParsedAttributesView &AttrList) {
10998 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
10999 assert(NamespcName && "Invalid NamespcName.");
11000 assert(IdentLoc.isValid() && "Invalid NamespceName location.");
11001
11002 // This can only happen along a recovery path.
11003 while (S->isTemplateParamScope())
11004 S = S->getParent();
11005 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
11006
11007 UsingDirectiveDecl *UDir = nullptr;
11008 NestedNameSpecifier *Qualifier = nullptr;
11009 if (SS.isSet())
11010 Qualifier = SS.getScopeRep();
11011
11012 // Lookup namespace name.
11013 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName);
11014 LookupParsedName(R, S, &SS);
11015 if (R.isAmbiguous())
11016 return nullptr;
11017
11018 if (R.empty()) {
11019 R.clear();
11020 // Allow "using namespace std;" or "using namespace ::std;" even if
11021 // "std" hasn't been defined yet, for GCC compatibility.
11022 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) &&
11023 NamespcName->isStr("std")) {
11024 Diag(IdentLoc, diag::ext_using_undefined_std);
11025 R.addDecl(getOrCreateStdNamespace());
11026 R.resolveKind();
11027 }
11028 // Otherwise, attempt typo correction.
11029 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName);
11030 }
11031
11032 if (!R.empty()) {
11033 NamedDecl *Named = R.getRepresentativeDecl();
11034 NamespaceDecl *NS = R.getAsSingle<NamespaceDecl>();
11035 assert(NS && "expected namespace decl");
11036
11037 // The use of a nested name specifier may trigger deprecation warnings.
11038 DiagnoseUseOfDecl(Named, IdentLoc);
11039
11040 // C++ [namespace.udir]p1:
11041 // A using-directive specifies that the names in the nominated
11042 // namespace can be used in the scope in which the
11043 // using-directive appears after the using-directive. During
11044 // unqualified name lookup (3.4.1), the names appear as if they
11045 // were declared in the nearest enclosing namespace which
11046 // contains both the using-directive and the nominated
11047 // namespace. [Note: in this context, "contains" means "contains
11048 // directly or indirectly". ]
11049
11050 // Find enclosing context containing both using-directive and
11051 // nominated namespace.
11052 DeclContext *CommonAncestor = NS;
11053 while (CommonAncestor && !CommonAncestor->Encloses(CurContext))
11054 CommonAncestor = CommonAncestor->getParent();
11055
11056 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc,
11057 SS.getWithLocInContext(Context),
11058 IdentLoc, Named, CommonAncestor);
11059
11060 if (IsUsingDirectiveInToplevelContext(CurContext) &&
11061 !SourceMgr.isInMainFile(SourceMgr.getExpansionLoc(IdentLoc))) {
11062 Diag(IdentLoc, diag::warn_using_directive_in_header);
11063 }
11064
11065 PushUsingDirective(S, UDir);
11066 } else {
11067 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
11068 }
11069
11070 if (UDir)
11071 ProcessDeclAttributeList(S, UDir, AttrList);
11072
11073 return UDir;
11074 }
11075
11076 void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) {
11077 // If the scope has an associated entity and the using directive is at
11078 // namespace or translation unit scope, add the UsingDirectiveDecl into
11079 // its lookup structure so qualified name lookup can find it.
11080 DeclContext *Ctx = S->getEntity();
11081 if (Ctx && !Ctx->isFunctionOrMethod())
11082 Ctx->addDecl(UDir);
11083 else
11084 // Otherwise, it is at block scope. The using-directives will affect lookup
11085 // only to the end of the scope.
11086 S->PushUsingDirective(UDir);
11087 }
11088
11089 Decl *Sema::ActOnUsingDeclaration(Scope *S, AccessSpecifier AS,
11090 SourceLocation UsingLoc,
11091 SourceLocation TypenameLoc, CXXScopeSpec &SS,
11092 UnqualifiedId &Name,
11093 SourceLocation EllipsisLoc,
11094 const ParsedAttributesView &AttrList) {
11095 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
11096
11097 if (SS.isEmpty()) {
11098 Diag(Name.getBeginLoc(), diag::err_using_requires_qualname);
11099 return nullptr;
11100 }
11101
11102 switch (Name.getKind()) {
11103 case UnqualifiedIdKind::IK_ImplicitSelfParam:
11104 case UnqualifiedIdKind::IK_Identifier:
11105 case UnqualifiedIdKind::IK_OperatorFunctionId:
11106 case UnqualifiedIdKind::IK_LiteralOperatorId:
11107 case UnqualifiedIdKind::IK_ConversionFunctionId:
11108 break;
11109
11110 case UnqualifiedIdKind::IK_ConstructorName:
11111 case UnqualifiedIdKind::IK_ConstructorTemplateId:
11112 // C++11 inheriting constructors.
11113 Diag(Name.getBeginLoc(),
11114 getLangOpts().CPlusPlus11
11115 ? diag::warn_cxx98_compat_using_decl_constructor
11116 : diag::err_using_decl_constructor)
11117 << SS.getRange();
11118
11119 if (getLangOpts().CPlusPlus11) break;
11120
11121 return nullptr;
11122
11123 case UnqualifiedIdKind::IK_DestructorName:
11124 Diag(Name.getBeginLoc(), diag::err_using_decl_destructor) << SS.getRange();
11125 return nullptr;
11126
11127 case UnqualifiedIdKind::IK_TemplateId:
11128 Diag(Name.getBeginLoc(), diag::err_using_decl_template_id)
11129 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc);
11130 return nullptr;
11131
11132 case UnqualifiedIdKind::IK_DeductionGuideName:
11133 llvm_unreachable("cannot parse qualified deduction guide name");
11134 }
11135
11136 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name);
11137 DeclarationName TargetName = TargetNameInfo.getName();
11138 if (!TargetName)
11139 return nullptr;
11140
11141 // Warn about access declarations.
11142 if (UsingLoc.isInvalid()) {
11143 Diag(Name.getBeginLoc(), getLangOpts().CPlusPlus11
11144 ? diag::err_access_decl
11145 : diag::warn_access_decl_deprecated)
11146 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using ");
11147 }
11148
11149 if (EllipsisLoc.isInvalid()) {
11150 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) ||
11151 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration))
11152 return nullptr;
11153 } else {
11154 if (!SS.getScopeRep()->containsUnexpandedParameterPack() &&
11155 !TargetNameInfo.containsUnexpandedParameterPack()) {
11156 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
11157 << SourceRange(SS.getBeginLoc(), TargetNameInfo.getEndLoc());
11158 EllipsisLoc = SourceLocation();
11159 }
11160 }
11161
11162 NamedDecl *UD =
11163 BuildUsingDeclaration(S, AS, UsingLoc, TypenameLoc.isValid(), TypenameLoc,
11164 SS, TargetNameInfo, EllipsisLoc, AttrList,
11165 /*IsInstantiation*/false);
11166 if (UD)
11167 PushOnScopeChains(UD, S, /*AddToContext*/ false);
11168
11169 return UD;
11170 }
11171
11172 /// Determine whether a using declaration considers the given
11173 /// declarations as "equivalent", e.g., if they are redeclarations of
11174 /// the same entity or are both typedefs of the same type.
11175 static bool
11176 IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2) {
11177 if (D1->getCanonicalDecl() == D2->getCanonicalDecl())
11178 return true;
11179
11180 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1))
11181 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2))
11182 return Context.hasSameType(TD1->getUnderlyingType(),
11183 TD2->getUnderlyingType());
11184
11185 return false;
11186 }
11187
11188
11189 /// Determines whether to create a using shadow decl for a particular
11190 /// decl, given the set of decls existing prior to this using lookup.
11191 bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig,
11192 const LookupResult &Previous,
11193 UsingShadowDecl *&PrevShadow) {
11194 // Diagnose finding a decl which is not from a base class of the
11195 // current class. We do this now because there are cases where this
11196 // function will silently decide not to build a shadow decl, which
11197 // will pre-empt further diagnostics.
11198 //
11199 // We don't need to do this in C++11 because we do the check once on
11200 // the qualifier.
11201 //
11202 // FIXME: diagnose the following if we care enough:
11203 // struct A { int foo; };
11204 // struct B : A { using A::foo; };
11205 // template <class T> struct C : A {};
11206 // template <class T> struct D : C<T> { using B::foo; } // <---
11207 // This is invalid (during instantiation) in C++03 because B::foo
11208 // resolves to the using decl in B, which is not a base class of D<T>.
11209 // We can't diagnose it immediately because C<T> is an unknown
11210 // specialization. The UsingShadowDecl in D<T> then points directly
11211 // to A::foo, which will look well-formed when we instantiate.
11212 // The right solution is to not collapse the shadow-decl chain.
11213 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) {
11214 DeclContext *OrigDC = Orig->getDeclContext();
11215
11216 // Handle enums and anonymous structs.
11217 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent();
11218 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC);
11219 while (OrigRec->isAnonymousStructOrUnion())
11220 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext());
11221
11222 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) {
11223 if (OrigDC == CurContext) {
11224 Diag(Using->getLocation(),
11225 diag::err_using_decl_nested_name_specifier_is_current_class)
11226 << Using->getQualifierLoc().getSourceRange();
11227 Diag(Orig->getLocation(), diag::note_using_decl_target);
11228 Using->setInvalidDecl();
11229 return true;
11230 }
11231
11232 Diag(Using->getQualifierLoc().getBeginLoc(),
11233 diag::err_using_decl_nested_name_specifier_is_not_base_class)
11234 << Using->getQualifier()
11235 << cast<CXXRecordDecl>(CurContext)
11236 << Using->getQualifierLoc().getSourceRange();
11237 Diag(Orig->getLocation(), diag::note_using_decl_target);
11238 Using->setInvalidDecl();
11239 return true;
11240 }
11241 }
11242
11243 if (Previous.empty()) return false;
11244
11245 NamedDecl *Target = Orig;
11246 if (isa<UsingShadowDecl>(Target))
11247 Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
11248
11249 // If the target happens to be one of the previous declarations, we
11250 // don't have a conflict.
11251 //
11252 // FIXME: but we might be increasing its access, in which case we
11253 // should redeclare it.
11254 NamedDecl *NonTag = nullptr, *Tag = nullptr;
11255 bool FoundEquivalentDecl = false;
11256 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
11257 I != E; ++I) {
11258 NamedDecl *D = (*I)->getUnderlyingDecl();
11259 // We can have UsingDecls in our Previous results because we use the same
11260 // LookupResult for checking whether the UsingDecl itself is a valid
11261 // redeclaration.
11262 if (isa<UsingDecl>(D) || isa<UsingPackDecl>(D))
11263 continue;
11264
11265 if (auto *RD = dyn_cast<CXXRecordDecl>(D)) {
11266 // C++ [class.mem]p19:
11267 // If T is the name of a class, then [every named member other than
11268 // a non-static data member] shall have a name different from T
11269 if (RD->isInjectedClassName() && !isa<FieldDecl>(Target) &&
11270 !isa<IndirectFieldDecl>(Target) &&
11271 !isa<UnresolvedUsingValueDecl>(Target) &&
11272 DiagnoseClassNameShadow(
11273 CurContext,
11274 DeclarationNameInfo(Using->getDeclName(), Using->getLocation())))
11275 return true;
11276 }
11277
11278 if (IsEquivalentForUsingDecl(Context, D, Target)) {
11279 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(*I))
11280 PrevShadow = Shadow;
11281 FoundEquivalentDecl = true;
11282 } else if (isEquivalentInternalLinkageDeclaration(D, Target)) {
11283 // We don't conflict with an existing using shadow decl of an equivalent
11284 // declaration, but we're not a redeclaration of it.
11285 FoundEquivalentDecl = true;
11286 }
11287
11288 if (isVisible(D))
11289 (isa<TagDecl>(D) ? Tag : NonTag) = D;
11290 }
11291
11292 if (FoundEquivalentDecl)
11293 return false;
11294
11295 if (FunctionDecl *FD = Target->getAsFunction()) {
11296 NamedDecl *OldDecl = nullptr;
11297 switch (CheckOverload(nullptr, FD, Previous, OldDecl,
11298 /*IsForUsingDecl*/ true)) {
11299 case Ovl_Overload:
11300 return false;
11301
11302 case Ovl_NonFunction:
11303 Diag(Using->getLocation(), diag::err_using_decl_conflict);
11304 break;
11305
11306 // We found a decl with the exact signature.
11307 case Ovl_Match:
11308 // If we're in a record, we want to hide the target, so we
11309 // return true (without a diagnostic) to tell the caller not to
11310 // build a shadow decl.
11311 if (CurContext->isRecord())
11312 return true;
11313
11314 // If we're not in a record, this is an error.
11315 Diag(Using->getLocation(), diag::err_using_decl_conflict);
11316 break;
11317 }
11318
11319 Diag(Target->getLocation(), diag::note_using_decl_target);
11320 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict);
11321 Using->setInvalidDecl();
11322 return true;
11323 }
11324
11325 // Target is not a function.
11326
11327 if (isa<TagDecl>(Target)) {
11328 // No conflict between a tag and a non-tag.
11329 if (!Tag) return false;
11330
11331 Diag(Using->getLocation(), diag::err_using_decl_conflict);
11332 Diag(Target->getLocation(), diag::note_using_decl_target);
11333 Diag(Tag->getLocation(), diag::note_using_decl_conflict);
11334 Using->setInvalidDecl();
11335 return true;
11336 }
11337
11338 // No conflict between a tag and a non-tag.
11339 if (!NonTag) return false;
11340
11341 Diag(Using->getLocation(), diag::err_using_decl_conflict);
11342 Diag(Target->getLocation(), diag::note_using_decl_target);
11343 Diag(NonTag->getLocation(), diag::note_using_decl_conflict);
11344 Using->setInvalidDecl();
11345 return true;
11346 }
11347
11348 /// Determine whether a direct base class is a virtual base class.
11349 static bool isVirtualDirectBase(CXXRecordDecl *Derived, CXXRecordDecl *Base) {
11350 if (!Derived->getNumVBases())
11351 return false;
11352 for (auto &B : Derived->bases())
11353 if (B.getType()->getAsCXXRecordDecl() == Base)
11354 return B.isVirtual();
11355 llvm_unreachable("not a direct base class");
11356 }
11357
11358 /// Builds a shadow declaration corresponding to a 'using' declaration.
11359 UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S,
11360 UsingDecl *UD,
11361 NamedDecl *Orig,
11362 UsingShadowDecl *PrevDecl) {
11363 // If we resolved to another shadow declaration, just coalesce them.
11364 NamedDecl *Target = Orig;
11365 if (isa<UsingShadowDecl>(Target)) {
11366 Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
11367 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration");
11368 }
11369
11370 NamedDecl *NonTemplateTarget = Target;
11371 if (auto *TargetTD = dyn_cast<TemplateDecl>(Target))
11372 NonTemplateTarget = TargetTD->getTemplatedDecl();
11373
11374 UsingShadowDecl *Shadow;
11375 if (NonTemplateTarget && isa<CXXConstructorDecl>(NonTemplateTarget)) {
11376 bool IsVirtualBase =
11377 isVirtualDirectBase(cast<CXXRecordDecl>(CurContext),
11378 UD->getQualifier()->getAsRecordDecl());
11379 Shadow = ConstructorUsingShadowDecl::Create(
11380 Context, CurContext, UD->getLocation(), UD, Orig, IsVirtualBase);
11381 } else {
11382 Shadow = UsingShadowDecl::Create(Context, CurContext, UD->getLocation(), UD,
11383 Target);
11384 }
11385 UD->addShadowDecl(Shadow);
11386
11387 Shadow->setAccess(UD->getAccess());
11388 if (Orig->isInvalidDecl() || UD->isInvalidDecl())
11389 Shadow->setInvalidDecl();
11390
11391 Shadow->setPreviousDecl(PrevDecl);
11392
11393 if (S)
11394 PushOnScopeChains(Shadow, S);
11395 else
11396 CurContext->addDecl(Shadow);
11397
11398
11399 return Shadow;
11400 }
11401
11402 /// Hides a using shadow declaration. This is required by the current
11403 /// using-decl implementation when a resolvable using declaration in a
11404 /// class is followed by a declaration which would hide or override
11405 /// one or more of the using decl's targets; for example:
11406 ///
11407 /// struct Base { void foo(int); };
11408 /// struct Derived : Base {
11409 /// using Base::foo;
11410 /// void foo(int);
11411 /// };
11412 ///
11413 /// The governing language is C++03 [namespace.udecl]p12:
11414 ///
11415 /// When a using-declaration brings names from a base class into a
11416 /// derived class scope, member functions in the derived class
11417 /// override and/or hide member functions with the same name and
11418 /// parameter types in a base class (rather than conflicting).
11419 ///
11420 /// There are two ways to implement this:
11421 /// (1) optimistically create shadow decls when they're not hidden
11422 /// by existing declarations, or
11423 /// (2) don't create any shadow decls (or at least don't make them
11424 /// visible) until we've fully parsed/instantiated the class.
11425 /// The problem with (1) is that we might have to retroactively remove
11426 /// a shadow decl, which requires several O(n) operations because the
11427 /// decl structures are (very reasonably) not designed for removal.
11428 /// (2) avoids this but is very fiddly and phase-dependent.
11429 void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) {
11430 if (Shadow->getDeclName().getNameKind() ==
11431 DeclarationName::CXXConversionFunctionName)
11432 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow);
11433
11434 // Remove it from the DeclContext...
11435 Shadow->getDeclContext()->removeDecl(Shadow);
11436
11437 // ...and the scope, if applicable...
11438 if (S) {
11439 S->RemoveDecl(Shadow);
11440 IdResolver.RemoveDecl(Shadow);
11441 }
11442
11443 // ...and the using decl.
11444 Shadow->getUsingDecl()->removeShadowDecl(Shadow);
11445
11446 // TODO: complain somehow if Shadow was used. It shouldn't
11447 // be possible for this to happen, because...?
11448 }
11449
11450 /// Find the base specifier for a base class with the given type.
11451 static CXXBaseSpecifier *findDirectBaseWithType(CXXRecordDecl *Derived,
11452 QualType DesiredBase,
11453 bool &AnyDependentBases) {
11454 // Check whether the named type is a direct base class.
11455 CanQualType CanonicalDesiredBase = DesiredBase->getCanonicalTypeUnqualified()
11456 .getUnqualifiedType();
11457 for (auto &Base : Derived->bases()) {
11458 CanQualType BaseType = Base.getType()->getCanonicalTypeUnqualified();
11459 if (CanonicalDesiredBase == BaseType)
11460 return &Base;
11461 if (BaseType->isDependentType())
11462 AnyDependentBases = true;
11463 }
11464 return nullptr;
11465 }
11466
11467 namespace {
11468 class UsingValidatorCCC final : public CorrectionCandidateCallback {
11469 public:
11470 UsingValidatorCCC(bool HasTypenameKeyword, bool IsInstantiation,
11471 NestedNameSpecifier *NNS, CXXRecordDecl *RequireMemberOf)
11472 : HasTypenameKeyword(HasTypenameKeyword),
11473 IsInstantiation(IsInstantiation), OldNNS(NNS),
11474 RequireMemberOf(RequireMemberOf) {}
11475
11476 bool ValidateCandidate(const TypoCorrection &Candidate) override {
11477 NamedDecl *ND = Candidate.getCorrectionDecl();
11478
11479 // Keywords are not valid here.
11480 if (!ND || isa<NamespaceDecl>(ND))
11481 return false;
11482
11483 // Completely unqualified names are invalid for a 'using' declaration.
11484 if (Candidate.WillReplaceSpecifier() && !Candidate.getCorrectionSpecifier())
11485 return false;
11486
11487 // FIXME: Don't correct to a name that CheckUsingDeclRedeclaration would
11488 // reject.
11489
11490 if (RequireMemberOf) {
11491 auto *FoundRecord = dyn_cast<CXXRecordDecl>(ND);
11492 if (FoundRecord && FoundRecord->isInjectedClassName()) {
11493 // No-one ever wants a using-declaration to name an injected-class-name
11494 // of a base class, unless they're declaring an inheriting constructor.
11495 ASTContext &Ctx = ND->getASTContext();
11496 if (!Ctx.getLangOpts().CPlusPlus11)
11497 return false;
11498 QualType FoundType = Ctx.getRecordType(FoundRecord);
11499
11500 // Check that the injected-class-name is named as a member of its own
11501 // type; we don't want to suggest 'using Derived::Base;', since that
11502 // means something else.
11503 NestedNameSpecifier *Specifier =
11504 Candidate.WillReplaceSpecifier()
11505 ? Candidate.getCorrectionSpecifier()
11506 : OldNNS;
11507 if (!Specifier->getAsType() ||
11508 !Ctx.hasSameType(QualType(Specifier->getAsType(), 0), FoundType))
11509 return false;
11510
11511 // Check that this inheriting constructor declaration actually names a
11512 // direct base class of the current class.
11513 bool AnyDependentBases = false;
11514 if (!findDirectBaseWithType(RequireMemberOf,
11515 Ctx.getRecordType(FoundRecord),
11516 AnyDependentBases) &&
11517 !AnyDependentBases)
11518 return false;
11519 } else {
11520 auto *RD = dyn_cast<CXXRecordDecl>(ND->getDeclContext());
11521 if (!RD || RequireMemberOf->isProvablyNotDerivedFrom(RD))
11522 return false;
11523
11524 // FIXME: Check that the base class member is accessible?
11525 }
11526 } else {
11527 auto *FoundRecord = dyn_cast<CXXRecordDecl>(ND);
11528 if (FoundRecord && FoundRecord->isInjectedClassName())
11529 return false;
11530 }
11531
11532 if (isa<TypeDecl>(ND))
11533 return HasTypenameKeyword || !IsInstantiation;
11534
11535 return !HasTypenameKeyword;
11536 }
11537
11538 std::unique_ptr<CorrectionCandidateCallback> clone() override {
11539 return std::make_unique<UsingValidatorCCC>(*this);
11540 }
11541
11542 private:
11543 bool HasTypenameKeyword;
11544 bool IsInstantiation;
11545 NestedNameSpecifier *OldNNS;
11546 CXXRecordDecl *RequireMemberOf;
11547 };
11548 } // end anonymous namespace
11549
11550 /// Builds a using declaration.
11551 ///
11552 /// \param IsInstantiation - Whether this call arises from an
11553 /// instantiation of an unresolved using declaration. We treat
11554 /// the lookup differently for these declarations.
11555 NamedDecl *Sema::BuildUsingDeclaration(
11556 Scope *S, AccessSpecifier AS, SourceLocation UsingLoc,
11557 bool HasTypenameKeyword, SourceLocation TypenameLoc, CXXScopeSpec &SS,
11558 DeclarationNameInfo NameInfo, SourceLocation EllipsisLoc,
11559 const ParsedAttributesView &AttrList, bool IsInstantiation) {
11560 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
11561 SourceLocation IdentLoc = NameInfo.getLoc();
11562 assert(IdentLoc.isValid() && "Invalid TargetName location.");
11563
11564 // FIXME: We ignore attributes for now.
11565
11566 // For an inheriting constructor declaration, the name of the using
11567 // declaration is the name of a constructor in this class, not in the
11568 // base class.
11569 DeclarationNameInfo UsingName = NameInfo;
11570 if (UsingName.getName().getNameKind() == DeclarationName::CXXConstructorName)
11571 if (auto *RD = dyn_cast<CXXRecordDecl>(CurContext))
11572 UsingName.setName(Context.DeclarationNames.getCXXConstructorName(
11573 Context.getCanonicalType(Context.getRecordType(RD))));
11574
11575 // Do the redeclaration lookup in the current scope.
11576 LookupResult Previous(*this, UsingName, LookupUsingDeclName,
11577 ForVisibleRedeclaration);
11578 Previous.setHideTags(false);
11579 if (S) {
11580 LookupName(Previous, S);
11581
11582 // It is really dumb that we have to do this.
11583 LookupResult::Filter F = Previous.makeFilter();
11584 while (F.hasNext()) {
11585 NamedDecl *D = F.next();
11586 if (!isDeclInScope(D, CurContext, S))
11587 F.erase();
11588 // If we found a local extern declaration that's not ordinarily visible,
11589 // and this declaration is being added to a non-block scope, ignore it.
11590 // We're only checking for scope conflicts here, not also for violations
11591 // of the linkage rules.
11592 else if (!CurContext->isFunctionOrMethod() && D->isLocalExternDecl() &&
11593 !(D->getIdentifierNamespace() & Decl::IDNS_Ordinary))
11594 F.erase();
11595 }
11596 F.done();
11597 } else {
11598 assert(IsInstantiation && "no scope in non-instantiation");
11599 if (CurContext->isRecord())
11600 LookupQualifiedName(Previous, CurContext);
11601 else {
11602 // No redeclaration check is needed here; in non-member contexts we
11603 // diagnosed all possible conflicts with other using-declarations when
11604 // building the template:
11605 //
11606 // For a dependent non-type using declaration, the only valid case is
11607 // if we instantiate to a single enumerator. We check for conflicts
11608 // between shadow declarations we introduce, and we check in the template
11609 // definition for conflicts between a non-type using declaration and any
11610 // other declaration, which together covers all cases.
11611 //
11612 // A dependent typename using declaration will never successfully
11613 // instantiate, since it will always name a class member, so we reject
11614 // that in the template definition.
11615 }
11616 }
11617
11618 // Check for invalid redeclarations.
11619 if (CheckUsingDeclRedeclaration(UsingLoc, HasTypenameKeyword,
11620 SS, IdentLoc, Previous))
11621 return nullptr;
11622
11623 // Check for bad qualifiers.
11624 if (CheckUsingDeclQualifier(UsingLoc, HasTypenameKeyword, SS, NameInfo,
11625 IdentLoc))
11626 return nullptr;
11627
11628 DeclContext *LookupContext = computeDeclContext(SS);
11629 NamedDecl *D;
11630 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
11631 if (!LookupContext || EllipsisLoc.isValid()) {
11632 if (HasTypenameKeyword) {
11633 // FIXME: not all declaration name kinds are legal here
11634 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext,
11635 UsingLoc, TypenameLoc,
11636 QualifierLoc,
11637 IdentLoc, NameInfo.getName(),
11638 EllipsisLoc);
11639 } else {
11640 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc,
11641 QualifierLoc, NameInfo, EllipsisLoc);
11642 }
11643 D->setAccess(AS);
11644 CurContext->addDecl(D);
11645 return D;
11646 }
11647
11648 auto Build = [&](bool Invalid) {
11649 UsingDecl *UD =
11650 UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc,
11651 UsingName, HasTypenameKeyword);
11652 UD->setAccess(AS);
11653 CurContext->addDecl(UD);
11654 UD->setInvalidDecl(Invalid);
11655 return UD;
11656 };
11657 auto BuildInvalid = [&]{ return Build(true); };
11658 auto BuildValid = [&]{ return Build(false); };
11659
11660 if (RequireCompleteDeclContext(SS, LookupContext))
11661 return BuildInvalid();
11662
11663 // Look up the target name.
11664 LookupResult R(*this, NameInfo, LookupOrdinaryName);
11665
11666 // Unlike most lookups, we don't always want to hide tag
11667 // declarations: tag names are visible through the using declaration
11668 // even if hidden by ordinary names, *except* in a dependent context
11669 // where it's important for the sanity of two-phase lookup.
11670 if (!IsInstantiation)
11671 R.setHideTags(false);
11672
11673 // For the purposes of this lookup, we have a base object type
11674 // equal to that of the current context.
11675 if (CurContext->isRecord()) {
11676 R.setBaseObjectType(
11677 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)));
11678 }
11679
11680 LookupQualifiedName(R, LookupContext);
11681
11682 // Try to correct typos if possible. If constructor name lookup finds no
11683 // results, that means the named class has no explicit constructors, and we
11684 // suppressed declaring implicit ones (probably because it's dependent or
11685 // invalid).
11686 if (R.empty() &&
11687 NameInfo.getName().getNameKind() != DeclarationName::CXXConstructorName) {
11688 // HACK: Work around a bug in libstdc++'s detection of ::gets. Sometimes
11689 // it will believe that glibc provides a ::gets in cases where it does not,
11690 // and will try to pull it into namespace std with a using-declaration.
11691 // Just ignore the using-declaration in that case.
11692 auto *II = NameInfo.getName().getAsIdentifierInfo();
11693 if (getLangOpts().CPlusPlus14 && II && II->isStr("gets") &&
11694 CurContext->isStdNamespace() &&
11695 isa<TranslationUnitDecl>(LookupContext) &&
11696 getSourceManager().isInSystemHeader(UsingLoc))
11697 return nullptr;
11698 UsingValidatorCCC CCC(HasTypenameKeyword, IsInstantiation, SS.getScopeRep(),
11699 dyn_cast<CXXRecordDecl>(CurContext));
11700 if (TypoCorrection Corrected =
11701 CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, CCC,
11702 CTK_ErrorRecovery)) {
11703 // We reject candidates where DroppedSpecifier == true, hence the
11704 // literal '0' below.
11705 diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest)
11706 << NameInfo.getName() << LookupContext << 0
11707 << SS.getRange());
11708
11709 // If we picked a correction with no attached Decl we can't do anything
11710 // useful with it, bail out.
11711 NamedDecl *ND = Corrected.getCorrectionDecl();
11712 if (!ND)
11713 return BuildInvalid();
11714
11715 // If we corrected to an inheriting constructor, handle it as one.
11716 auto *RD = dyn_cast<CXXRecordDecl>(ND);
11717 if (RD && RD->isInjectedClassName()) {
11718 // The parent of the injected class name is the class itself.
11719 RD = cast<CXXRecordDecl>(RD->getParent());
11720
11721 // Fix up the information we'll use to build the using declaration.
11722 if (Corrected.WillReplaceSpecifier()) {
11723 NestedNameSpecifierLocBuilder Builder;
11724 Builder.MakeTrivial(Context, Corrected.getCorrectionSpecifier(),
11725 QualifierLoc.getSourceRange());
11726 QualifierLoc = Builder.getWithLocInContext(Context);
11727 }
11728
11729 // In this case, the name we introduce is the name of a derived class
11730 // constructor.
11731 auto *CurClass = cast<CXXRecordDecl>(CurContext);
11732 UsingName.setName(Context.DeclarationNames.getCXXConstructorName(
11733 Context.getCanonicalType(Context.getRecordType(CurClass))));
11734 UsingName.setNamedTypeInfo(nullptr);
11735 for (auto *Ctor : LookupConstructors(RD))
11736 R.addDecl(Ctor);
11737 R.resolveKind();
11738 } else {
11739 // FIXME: Pick up all the declarations if we found an overloaded
11740 // function.
11741 UsingName.setName(ND->getDeclName());
11742 R.addDecl(ND);
11743 }
11744 } else {
11745 Diag(IdentLoc, diag::err_no_member)
11746 << NameInfo.getName() << LookupContext << SS.getRange();
11747 return BuildInvalid();
11748 }
11749 }
11750
11751 if (R.isAmbiguous())
11752 return BuildInvalid();
11753
11754 if (HasTypenameKeyword) {
11755 // If we asked for a typename and got a non-type decl, error out.
11756 if (!R.getAsSingle<TypeDecl>()) {
11757 Diag(IdentLoc, diag::err_using_typename_non_type);
11758 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
11759 Diag((*I)->getUnderlyingDecl()->getLocation(),
11760 diag::note_using_decl_target);
11761 return BuildInvalid();
11762 }
11763 } else {
11764 // If we asked for a non-typename and we got a type, error out,
11765 // but only if this is an instantiation of an unresolved using
11766 // decl. Otherwise just silently find the type name.
11767 if (IsInstantiation && R.getAsSingle<TypeDecl>()) {
11768 Diag(IdentLoc, diag::err_using_dependent_value_is_type);
11769 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target);
11770 return BuildInvalid();
11771 }
11772 }
11773
11774 // C++14 [namespace.udecl]p6:
11775 // A using-declaration shall not name a namespace.
11776 if (R.getAsSingle<NamespaceDecl>()) {
11777 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace)
11778 << SS.getRange();
11779 return BuildInvalid();
11780 }
11781
11782 // C++14 [namespace.udecl]p7:
11783 // A using-declaration shall not name a scoped enumerator.
11784 if (auto *ED = R.getAsSingle<EnumConstantDecl>()) {
11785 if (cast<EnumDecl>(ED->getDeclContext())->isScoped()) {
11786 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_scoped_enum)
11787 << SS.getRange();
11788 return BuildInvalid();
11789 }
11790 }
11791
11792 UsingDecl *UD = BuildValid();
11793
11794 // Some additional rules apply to inheriting constructors.
11795 if (UsingName.getName().getNameKind() ==
11796 DeclarationName::CXXConstructorName) {
11797 // Suppress access diagnostics; the access check is instead performed at the
11798 // point of use for an inheriting constructor.
11799 R.suppressDiagnostics();
11800 if (CheckInheritingConstructorUsingDecl(UD))
11801 return UD;
11802 }
11803
11804 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
11805 UsingShadowDecl *PrevDecl = nullptr;
11806 if (!CheckUsingShadowDecl(UD, *I, Previous, PrevDecl))
11807 BuildUsingShadowDecl(S, UD, *I, PrevDecl);
11808 }
11809
11810 return UD;
11811 }
11812
11813 NamedDecl *Sema::BuildUsingPackDecl(NamedDecl *InstantiatedFrom,
11814 ArrayRef<NamedDecl *> Expansions) {
11815 assert(isa<UnresolvedUsingValueDecl>(InstantiatedFrom) ||
11816 isa<UnresolvedUsingTypenameDecl>(InstantiatedFrom) ||
11817 isa<UsingPackDecl>(InstantiatedFrom));
11818
11819 auto *UPD =
11820 UsingPackDecl::Create(Context, CurContext, InstantiatedFrom, Expansions);
11821 UPD->setAccess(InstantiatedFrom->getAccess());
11822 CurContext->addDecl(UPD);
11823 return UPD;
11824 }
11825
11826 /// Additional checks for a using declaration referring to a constructor name.
11827 bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) {
11828 assert(!UD->hasTypename() && "expecting a constructor name");
11829
11830 const Type *SourceType = UD->getQualifier()->getAsType();
11831 assert(SourceType &&
11832 "Using decl naming constructor doesn't have type in scope spec.");
11833 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext);
11834
11835 // Check whether the named type is a direct base class.
11836 bool AnyDependentBases = false;
11837 auto *Base = findDirectBaseWithType(TargetClass, QualType(SourceType, 0),
11838 AnyDependentBases);
11839 if (!Base && !AnyDependentBases) {
11840 Diag(UD->getUsingLoc(),
11841 diag::err_using_decl_constructor_not_in_direct_base)
11842 << UD->getNameInfo().getSourceRange()
11843 << QualType(SourceType, 0) << TargetClass;
11844 UD->setInvalidDecl();
11845 return true;
11846 }
11847
11848 if (Base)
11849 Base->setInheritConstructors();
11850
11851 return false;
11852 }
11853
11854 /// Checks that the given using declaration is not an invalid
11855 /// redeclaration. Note that this is checking only for the using decl
11856 /// itself, not for any ill-formedness among the UsingShadowDecls.
11857 bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
11858 bool HasTypenameKeyword,
11859 const CXXScopeSpec &SS,
11860 SourceLocation NameLoc,
11861 const LookupResult &Prev) {
11862 NestedNameSpecifier *Qual = SS.getScopeRep();
11863
11864 // C++03 [namespace.udecl]p8:
11865 // C++0x [namespace.udecl]p10:
11866 // A using-declaration is a declaration and can therefore be used
11867 // repeatedly where (and only where) multiple declarations are
11868 // allowed.
11869 //
11870 // That's in non-member contexts.
11871 if (!CurContext->getRedeclContext()->isRecord()) {
11872 // A dependent qualifier outside a class can only ever resolve to an
11873 // enumeration type. Therefore it conflicts with any other non-type
11874 // declaration in the same scope.
11875 // FIXME: How should we check for dependent type-type conflicts at block
11876 // scope?
11877 if (Qual->isDependent() && !HasTypenameKeyword) {
11878 for (auto *D : Prev) {
11879 if (!isa<TypeDecl>(D) && !isa<UsingDecl>(D) && !isa<UsingPackDecl>(D)) {
11880 bool OldCouldBeEnumerator =
11881 isa<UnresolvedUsingValueDecl>(D) || isa<EnumConstantDecl>(D);
11882 Diag(NameLoc,
11883 OldCouldBeEnumerator ? diag::err_redefinition
11884 : diag::err_redefinition_different_kind)
11885 << Prev.getLookupName();
11886 Diag(D->getLocation(), diag::note_previous_definition);
11887 return true;
11888 }
11889 }
11890 }
11891 return false;
11892 }
11893
11894 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) {
11895 NamedDecl *D = *I;
11896
11897 bool DTypename;
11898 NestedNameSpecifier *DQual;
11899 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) {
11900 DTypename = UD->hasTypename();
11901 DQual = UD->getQualifier();
11902 } else if (UnresolvedUsingValueDecl *UD
11903 = dyn_cast<UnresolvedUsingValueDecl>(D)) {
11904 DTypename = false;
11905 DQual = UD->getQualifier();
11906 } else if (UnresolvedUsingTypenameDecl *UD
11907 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) {
11908 DTypename = true;
11909 DQual = UD->getQualifier();
11910 } else continue;
11911
11912 // using decls differ if one says 'typename' and the other doesn't.
11913 // FIXME: non-dependent using decls?
11914 if (HasTypenameKeyword != DTypename) continue;
11915
11916 // using decls differ if they name different scopes (but note that
11917 // template instantiation can cause this check to trigger when it
11918 // didn't before instantiation).
11919 if (Context.getCanonicalNestedNameSpecifier(Qual) !=
11920 Context.getCanonicalNestedNameSpecifier(DQual))
11921 continue;
11922
11923 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange();
11924 Diag(D->getLocation(), diag::note_using_decl) << 1;
11925 return true;
11926 }
11927
11928 return false;
11929 }
11930
11931
11932 /// Checks that the given nested-name qualifier used in a using decl
11933 /// in the current context is appropriately related to the current
11934 /// scope. If an error is found, diagnoses it and returns true.
11935 bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc,
11936 bool HasTypename,
11937 const CXXScopeSpec &SS,
11938 const DeclarationNameInfo &NameInfo,
11939 SourceLocation NameLoc) {
11940 DeclContext *NamedContext = computeDeclContext(SS);
11941
11942 if (!CurContext->isRecord()) {
11943 // C++03 [namespace.udecl]p3:
11944 // C++0x [namespace.udecl]p8:
11945 // A using-declaration for a class member shall be a member-declaration.
11946
11947 // If we weren't able to compute a valid scope, it might validly be a
11948 // dependent class scope or a dependent enumeration unscoped scope. If
11949 // we have a 'typename' keyword, the scope must resolve to a class type.
11950 if ((HasTypename && !NamedContext) ||
11951 (NamedContext && NamedContext->getRedeclContext()->isRecord())) {
11952 auto *RD = NamedContext
11953 ? cast<CXXRecordDecl>(NamedContext->getRedeclContext())
11954 : nullptr;
11955 if (RD && RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), RD))
11956 RD = nullptr;
11957
11958 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member)
11959 << SS.getRange();
11960
11961 // If we have a complete, non-dependent source type, try to suggest a
11962 // way to get the same effect.
11963 if (!RD)
11964 return true;
11965
11966 // Find what this using-declaration was referring to.
11967 LookupResult R(*this, NameInfo, LookupOrdinaryName);
11968 R.setHideTags(false);
11969 R.suppressDiagnostics();
11970 LookupQualifiedName(R, RD);
11971
11972 if (R.getAsSingle<TypeDecl>()) {
11973 if (getLangOpts().CPlusPlus11) {
11974 // Convert 'using X::Y;' to 'using Y = X::Y;'.
11975 Diag(SS.getBeginLoc(), diag::note_using_decl_class_member_workaround)
11976 << 0 // alias declaration
11977 << FixItHint::CreateInsertion(SS.getBeginLoc(),
11978 NameInfo.getName().getAsString() +
11979 " = ");
11980 } else {
11981 // Convert 'using X::Y;' to 'typedef X::Y Y;'.
11982 SourceLocation InsertLoc = getLocForEndOfToken(NameInfo.getEndLoc());
11983 Diag(InsertLoc, diag::note_using_decl_class_member_workaround)
11984 << 1 // typedef declaration
11985 << FixItHint::CreateReplacement(UsingLoc, "typedef")
11986 << FixItHint::CreateInsertion(
11987 InsertLoc, " " + NameInfo.getName().getAsString());
11988 }
11989 } else if (R.getAsSingle<VarDecl>()) {
11990 // Don't provide a fixit outside C++11 mode; we don't want to suggest
11991 // repeating the type of the static data member here.
11992 FixItHint FixIt;
11993 if (getLangOpts().CPlusPlus11) {
11994 // Convert 'using X::Y;' to 'auto &Y = X::Y;'.
11995 FixIt = FixItHint::CreateReplacement(
11996 UsingLoc, "auto &" + NameInfo.getName().getAsString() + " = ");
11997 }
11998
11999 Diag(UsingLoc, diag::note_using_decl_class_member_workaround)
12000 << 2 // reference declaration
12001 << FixIt;
12002 } else if (R.getAsSingle<EnumConstantDecl>()) {
12003 // Don't provide a fixit outside C++11 mode; we don't want to suggest
12004 // repeating the type of the enumeration here, and we can't do so if
12005 // the type is anonymous.
12006 FixItHint FixIt;
12007 if (getLangOpts().CPlusPlus11) {
12008 // Convert 'using X::Y;' to 'auto &Y = X::Y;'.
12009 FixIt = FixItHint::CreateReplacement(
12010 UsingLoc,
12011 "constexpr auto " + NameInfo.getName().getAsString() + " = ");
12012 }
12013
12014 Diag(UsingLoc, diag::note_using_decl_class_member_workaround)
12015 << (getLangOpts().CPlusPlus11 ? 4 : 3) // const[expr] variable
12016 << FixIt;
12017 }
12018 return true;
12019 }
12020
12021 // Otherwise, this might be valid.
12022 return false;
12023 }
12024
12025 // The current scope is a record.
12026
12027 // If the named context is dependent, we can't decide much.
12028 if (!NamedContext) {
12029 // FIXME: in C++0x, we can diagnose if we can prove that the
12030 // nested-name-specifier does not refer to a base class, which is
12031 // still possible in some cases.
12032
12033 // Otherwise we have to conservatively report that things might be
12034 // okay.
12035 return false;
12036 }
12037
12038 if (!NamedContext->isRecord()) {
12039 // Ideally this would point at the last name in the specifier,
12040 // but we don't have that level of source info.
12041 Diag(SS.getRange().getBegin(),
12042 diag::err_using_decl_nested_name_specifier_is_not_class)
12043 << SS.getScopeRep() << SS.getRange();
12044 return true;
12045 }
12046
12047 if (!NamedContext->isDependentContext() &&
12048 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext))
12049 return true;
12050
12051 if (getLangOpts().CPlusPlus11) {
12052 // C++11 [namespace.udecl]p3:
12053 // In a using-declaration used as a member-declaration, the
12054 // nested-name-specifier shall name a base class of the class
12055 // being defined.
12056
12057 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(
12058 cast<CXXRecordDecl>(NamedContext))) {
12059 if (CurContext == NamedContext) {
12060 Diag(NameLoc,
12061 diag::err_using_decl_nested_name_specifier_is_current_class)
12062 << SS.getRange();
12063 return true;
12064 }
12065
12066 if (!cast<CXXRecordDecl>(NamedContext)->isInvalidDecl()) {
12067 Diag(SS.getRange().getBegin(),
12068 diag::err_using_decl_nested_name_specifier_is_not_base_class)
12069 << SS.getScopeRep()
12070 << cast<CXXRecordDecl>(CurContext)
12071 << SS.getRange();
12072 }
12073 return true;
12074 }
12075
12076 return false;
12077 }
12078
12079 // C++03 [namespace.udecl]p4:
12080 // A using-declaration used as a member-declaration shall refer
12081 // to a member of a base class of the class being defined [etc.].
12082
12083 // Salient point: SS doesn't have to name a base class as long as
12084 // lookup only finds members from base classes. Therefore we can
12085 // diagnose here only if we can prove that that can't happen,
12086 // i.e. if the class hierarchies provably don't intersect.
12087
12088 // TODO: it would be nice if "definitely valid" results were cached
12089 // in the UsingDecl and UsingShadowDecl so that these checks didn't
12090 // need to be repeated.
12091
12092 llvm::SmallPtrSet<const CXXRecordDecl *, 4> Bases;
12093 auto Collect = [&Bases](const CXXRecordDecl *Base) {
12094 Bases.insert(Base);
12095 return true;
12096 };
12097
12098 // Collect all bases. Return false if we find a dependent base.
12099 if (!cast<CXXRecordDecl>(CurContext)->forallBases(Collect))
12100 return false;
12101
12102 // Returns true if the base is dependent or is one of the accumulated base
12103 // classes.
12104 auto IsNotBase = [&Bases](const CXXRecordDecl *Base) {
12105 return !Bases.count(Base);
12106 };
12107
12108 // Return false if the class has a dependent base or if it or one
12109 // of its bases is present in the base set of the current context.
12110 if (Bases.count(cast<CXXRecordDecl>(NamedContext)) ||
12111 !cast<CXXRecordDecl>(NamedContext)->forallBases(IsNotBase))
12112 return false;
12113
12114 Diag(SS.getRange().getBegin(),
12115 diag::err_using_decl_nested_name_specifier_is_not_base_class)
12116 << SS.getScopeRep()
12117 << cast<CXXRecordDecl>(CurContext)
12118 << SS.getRange();
12119
12120 return true;
12121 }
12122
12123 Decl *Sema::ActOnAliasDeclaration(Scope *S, AccessSpecifier AS,
12124 MultiTemplateParamsArg TemplateParamLists,
12125 SourceLocation UsingLoc, UnqualifiedId &Name,
12126 const ParsedAttributesView &AttrList,
12127 TypeResult Type, Decl *DeclFromDeclSpec) {
12128 // Skip up to the relevant declaration scope.
12129 while (S->isTemplateParamScope())
12130 S = S->getParent();
12131 assert((S->getFlags() & Scope::DeclScope) &&
12132 "got alias-declaration outside of declaration scope");
12133
12134 if (Type.isInvalid())
12135 return nullptr;
12136
12137 bool Invalid = false;
12138 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name);
12139 TypeSourceInfo *TInfo = nullptr;
12140 GetTypeFromParser(Type.get(), &TInfo);
12141
12142 if (DiagnoseClassNameShadow(CurContext, NameInfo))
12143 return nullptr;
12144
12145 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo,
12146 UPPC_DeclarationType)) {
12147 Invalid = true;
12148 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
12149 TInfo->getTypeLoc().getBeginLoc());
12150 }
12151
12152 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
12153 TemplateParamLists.size()
12154 ? forRedeclarationInCurContext()
12155 : ForVisibleRedeclaration);
12156 LookupName(Previous, S);
12157
12158 // Warn about shadowing the name of a template parameter.
12159 if (Previous.isSingleResult() &&
12160 Previous.getFoundDecl()->isTemplateParameter()) {
12161 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl());
12162 Previous.clear();
12163 }
12164
12165 assert(Name.Kind == UnqualifiedIdKind::IK_Identifier &&
12166 "name in alias declaration must be an identifier");
12167 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc,
12168 Name.StartLocation,
12169 Name.Identifier, TInfo);
12170
12171 NewTD->setAccess(AS);
12172
12173 if (Invalid)
12174 NewTD->setInvalidDecl();
12175
12176 ProcessDeclAttributeList(S, NewTD, AttrList);
12177 AddPragmaAttributes(S, NewTD);
12178
12179 CheckTypedefForVariablyModifiedType(S, NewTD);
12180 Invalid |= NewTD->isInvalidDecl();
12181
12182 bool Redeclaration = false;
12183
12184 NamedDecl *NewND;
12185 if (TemplateParamLists.size()) {
12186 TypeAliasTemplateDecl *OldDecl = nullptr;
12187 TemplateParameterList *OldTemplateParams = nullptr;
12188
12189 if (TemplateParamLists.size() != 1) {
12190 Diag(UsingLoc, diag::err_alias_template_extra_headers)
12191 << SourceRange(TemplateParamLists[1]->getTemplateLoc(),
12192 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc());
12193 }
12194 TemplateParameterList *TemplateParams = TemplateParamLists[0];
12195
12196 // Check that we can declare a template here.
12197 if (CheckTemplateDeclScope(S, TemplateParams))
12198 return nullptr;
12199
12200 // Only consider previous declarations in the same scope.
12201 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false,
12202 /*ExplicitInstantiationOrSpecialization*/false);
12203 if (!Previous.empty()) {
12204 Redeclaration = true;
12205
12206 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>();
12207 if (!OldDecl && !Invalid) {
12208 Diag(UsingLoc, diag::err_redefinition_different_kind)
12209 << Name.Identifier;
12210
12211 NamedDecl *OldD = Previous.getRepresentativeDecl();
12212 if (OldD->getLocation().isValid())
12213 Diag(OldD->getLocation(), diag::note_previous_definition);
12214
12215 Invalid = true;
12216 }
12217
12218 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) {
12219 if (TemplateParameterListsAreEqual(TemplateParams,
12220 OldDecl->getTemplateParameters(),
12221 /*Complain=*/true,
12222 TPL_TemplateMatch))
12223 OldTemplateParams =
12224 OldDecl->getMostRecentDecl()->getTemplateParameters();
12225 else
12226 Invalid = true;
12227
12228 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl();
12229 if (!Invalid &&
12230 !Context.hasSameType(OldTD->getUnderlyingType(),
12231 NewTD->getUnderlyingType())) {
12232 // FIXME: The C++0x standard does not clearly say this is ill-formed,
12233 // but we can't reasonably accept it.
12234 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef)
12235 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType();
12236 if (OldTD->getLocation().isValid())
12237 Diag(OldTD->getLocation(), diag::note_previous_definition);
12238 Invalid = true;
12239 }
12240 }
12241 }
12242
12243 // Merge any previous default template arguments into our parameters,
12244 // and check the parameter list.
12245 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams,
12246 TPC_TypeAliasTemplate))
12247 return nullptr;
12248
12249 TypeAliasTemplateDecl *NewDecl =
12250 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc,
12251 Name.Identifier, TemplateParams,
12252 NewTD);
12253 NewTD->setDescribedAliasTemplate(NewDecl);
12254
12255 NewDecl->setAccess(AS);
12256
12257 if (Invalid)
12258 NewDecl->setInvalidDecl();
12259 else if (OldDecl) {
12260 NewDecl->setPreviousDecl(OldDecl);
12261 CheckRedeclarationModuleOwnership(NewDecl, OldDecl);
12262 }
12263
12264 NewND = NewDecl;
12265 } else {
12266 if (auto *TD = dyn_cast_or_null<TagDecl>(DeclFromDeclSpec)) {
12267 setTagNameForLinkagePurposes(TD, NewTD);
12268 handleTagNumbering(TD, S);
12269 }
12270 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration);
12271 NewND = NewTD;
12272 }
12273
12274 PushOnScopeChains(NewND, S);
12275 ActOnDocumentableDecl(NewND);
12276 return NewND;
12277 }
12278
12279 Decl *Sema::ActOnNamespaceAliasDef(Scope *S, SourceLocation NamespaceLoc,
12280 SourceLocation AliasLoc,
12281 IdentifierInfo *Alias, CXXScopeSpec &SS,
12282 SourceLocation IdentLoc,
12283 IdentifierInfo *Ident) {
12284
12285 // Lookup the namespace name.
12286 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName);
12287 LookupParsedName(R, S, &SS);
12288
12289 if (R.isAmbiguous())
12290 return nullptr;
12291
12292 if (R.empty()) {
12293 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) {
12294 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
12295 return nullptr;
12296 }
12297 }
12298 assert(!R.isAmbiguous() && !R.empty());
12299 NamedDecl *ND = R.getRepresentativeDecl();
12300
12301 // Check if we have a previous declaration with the same name.
12302 LookupResult PrevR(*this, Alias, AliasLoc, LookupOrdinaryName,
12303 ForVisibleRedeclaration);
12304 LookupName(PrevR, S);
12305
12306 // Check we're not shadowing a template parameter.
12307 if (PrevR.isSingleResult() && PrevR.getFoundDecl()->isTemplateParameter()) {
12308 DiagnoseTemplateParameterShadow(AliasLoc, PrevR.getFoundDecl());
12309 PrevR.clear();
12310 }
12311
12312 // Filter out any other lookup result from an enclosing scope.
12313 FilterLookupForScope(PrevR, CurContext, S, /*ConsiderLinkage*/false,
12314 /*AllowInlineNamespace*/false);
12315
12316 // Find the previous declaration and check that we can redeclare it.
12317 NamespaceAliasDecl *Prev = nullptr;
12318 if (PrevR.isSingleResult()) {
12319 NamedDecl *PrevDecl = PrevR.getRepresentativeDecl();
12320 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) {
12321 // We already have an alias with the same name that points to the same
12322 // namespace; check that it matches.
12323 if (AD->getNamespace()->Equals(getNamespaceDecl(ND))) {
12324 Prev = AD;
12325 } else if (isVisible(PrevDecl)) {
12326 Diag(AliasLoc, diag::err_redefinition_different_namespace_alias)
12327 << Alias;
12328 Diag(AD->getLocation(), diag::note_previous_namespace_alias)
12329 << AD->getNamespace();
12330 return nullptr;
12331 }
12332 } else if (isVisible(PrevDecl)) {
12333 unsigned DiagID = isa<NamespaceDecl>(PrevDecl->getUnderlyingDecl())
12334 ? diag::err_redefinition
12335 : diag::err_redefinition_different_kind;
12336 Diag(AliasLoc, DiagID) << Alias;
12337 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
12338 return nullptr;
12339 }
12340 }
12341
12342 // The use of a nested name specifier may trigger deprecation warnings.
12343 DiagnoseUseOfDecl(ND, IdentLoc);
12344
12345 NamespaceAliasDecl *AliasDecl =
12346 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc,
12347 Alias, SS.getWithLocInContext(Context),
12348 IdentLoc, ND);
12349 if (Prev)
12350 AliasDecl->setPreviousDecl(Prev);
12351
12352 PushOnScopeChains(AliasDecl, S);
12353 return AliasDecl;
12354 }
12355
12356 namespace {
12357 struct SpecialMemberExceptionSpecInfo
12358 : SpecialMemberVisitor<SpecialMemberExceptionSpecInfo> {
12359 SourceLocation Loc;
12360 Sema::ImplicitExceptionSpecification ExceptSpec;
12361
12362 SpecialMemberExceptionSpecInfo(Sema &S, CXXMethodDecl *MD,
12363 Sema::CXXSpecialMember CSM,
12364 Sema::InheritedConstructorInfo *ICI,
12365 SourceLocation Loc)
12366 : SpecialMemberVisitor(S, MD, CSM, ICI), Loc(Loc), ExceptSpec(S) {}
12367
12368 bool visitBase(CXXBaseSpecifier *Base);
12369 bool visitField(FieldDecl *FD);
12370
12371 void visitClassSubobject(CXXRecordDecl *Class, Subobject Subobj,
12372 unsigned Quals);
12373
12374 void visitSubobjectCall(Subobject Subobj,
12375 Sema::SpecialMemberOverloadResult SMOR);
12376 };
12377 }
12378
12379 bool SpecialMemberExceptionSpecInfo::visitBase(CXXBaseSpecifier *Base) {
12380 auto *RT = Base->getType()->getAs<RecordType>();
12381 if (!RT)
12382 return false;
12383
12384 auto *BaseClass = cast<CXXRecordDecl>(RT->getDecl());
12385 Sema::SpecialMemberOverloadResult SMOR = lookupInheritedCtor(BaseClass);
12386 if (auto *BaseCtor = SMOR.getMethod()) {
12387 visitSubobjectCall(Base, BaseCtor);
12388 return false;
12389 }
12390
12391 visitClassSubobject(BaseClass, Base, 0);
12392 return false;
12393 }
12394
12395 bool SpecialMemberExceptionSpecInfo::visitField(FieldDecl *FD) {
12396 if (CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer()) {
12397 Expr *E = FD->getInClassInitializer();
12398 if (!E)
12399 // FIXME: It's a little wasteful to build and throw away a
12400 // CXXDefaultInitExpr here.
12401 // FIXME: We should have a single context note pointing at Loc, and
12402 // this location should be MD->getLocation() instead, since that's
12403 // the location where we actually use the default init expression.
12404 E = S.BuildCXXDefaultInitExpr(Loc, FD).get();
12405 if (E)
12406 ExceptSpec.CalledExpr(E);
12407 } else if (auto *RT = S.Context.getBaseElementType(FD->getType())
12408 ->getAs<RecordType>()) {
12409 visitClassSubobject(cast<CXXRecordDecl>(RT->getDecl()), FD,
12410 FD->getType().getCVRQualifiers());
12411 }
12412 return false;
12413 }
12414
12415 void SpecialMemberExceptionSpecInfo::visitClassSubobject(CXXRecordDecl *Class,
12416 Subobject Subobj,
12417 unsigned Quals) {
12418 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
12419 bool IsMutable = Field && Field->isMutable();
12420 visitSubobjectCall(Subobj, lookupIn(Class, Quals, IsMutable));
12421 }
12422
12423 void SpecialMemberExceptionSpecInfo::visitSubobjectCall(
12424 Subobject Subobj, Sema::SpecialMemberOverloadResult SMOR) {
12425 // Note, if lookup fails, it doesn't matter what exception specification we
12426 // choose because the special member will be deleted.
12427 if (CXXMethodDecl *MD = SMOR.getMethod())
12428 ExceptSpec.CalledDecl(getSubobjectLoc(Subobj), MD);
12429 }
12430
12431 bool Sema::tryResolveExplicitSpecifier(ExplicitSpecifier &ExplicitSpec) {
12432 llvm::APSInt Result;
12433 ExprResult Converted = CheckConvertedConstantExpression(
12434 ExplicitSpec.getExpr(), Context.BoolTy, Result, CCEK_ExplicitBool);
12435 ExplicitSpec.setExpr(Converted.get());
12436 if (Converted.isUsable() && !Converted.get()->isValueDependent()) {
12437 ExplicitSpec.setKind(Result.getBoolValue()
12438 ? ExplicitSpecKind::ResolvedTrue
12439 : ExplicitSpecKind::ResolvedFalse);
12440 return true;
12441 }
12442 ExplicitSpec.setKind(ExplicitSpecKind::Unresolved);
12443 return false;
12444 }
12445
12446 ExplicitSpecifier Sema::ActOnExplicitBoolSpecifier(Expr *ExplicitExpr) {
12447 ExplicitSpecifier ES(ExplicitExpr, ExplicitSpecKind::Unresolved);
12448 if (!ExplicitExpr->isTypeDependent())
12449 tryResolveExplicitSpecifier(ES);
12450 return ES;
12451 }
12452
12453 static Sema::ImplicitExceptionSpecification
12454 ComputeDefaultedSpecialMemberExceptionSpec(
12455 Sema &S, SourceLocation Loc, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM,
12456 Sema::InheritedConstructorInfo *ICI) {
12457 ComputingExceptionSpec CES(S, MD, Loc);
12458
12459 CXXRecordDecl *ClassDecl = MD->getParent();
12460
12461 // C++ [except.spec]p14:
12462 // An implicitly declared special member function (Clause 12) shall have an
12463 // exception-specification. [...]
12464 SpecialMemberExceptionSpecInfo Info(S, MD, CSM, ICI, MD->getLocation());
12465 if (ClassDecl->isInvalidDecl())
12466 return Info.ExceptSpec;
12467
12468 // FIXME: If this diagnostic fires, we're probably missing a check for
12469 // attempting to resolve an exception specification before it's known
12470 // at a higher level.
12471 if (S.RequireCompleteType(MD->getLocation(),
12472 S.Context.getRecordType(ClassDecl),
12473 diag::err_exception_spec_incomplete_type))
12474 return Info.ExceptSpec;
12475
12476 // C++1z [except.spec]p7:
12477 // [Look for exceptions thrown by] a constructor selected [...] to
12478 // initialize a potentially constructed subobject,
12479 // C++1z [except.spec]p8:
12480 // The exception specification for an implicitly-declared destructor, or a
12481 // destructor without a noexcept-specifier, is potentially-throwing if and
12482 // only if any of the destructors for any of its potentially constructed
12483 // subojects is potentially throwing.
12484 // FIXME: We respect the first rule but ignore the "potentially constructed"
12485 // in the second rule to resolve a core issue (no number yet) that would have
12486 // us reject:
12487 // struct A { virtual void f() = 0; virtual ~A() noexcept(false) = 0; };
12488 // struct B : A {};
12489 // struct C : B { void f(); };
12490 // ... due to giving B::~B() a non-throwing exception specification.
12491 Info.visit(Info.IsConstructor ? Info.VisitPotentiallyConstructedBases
12492 : Info.VisitAllBases);
12493
12494 return Info.ExceptSpec;
12495 }
12496
12497 namespace {
12498 /// RAII object to register a special member as being currently declared.
12499 struct DeclaringSpecialMember {
12500 Sema &S;
12501 Sema::SpecialMemberDecl D;
12502 Sema::ContextRAII SavedContext;
12503 bool WasAlreadyBeingDeclared;
12504
12505 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM)
12506 : S(S), D(RD, CSM), SavedContext(S, RD) {
12507 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D).second;
12508 if (WasAlreadyBeingDeclared)
12509 // This almost never happens, but if it does, ensure that our cache
12510 // doesn't contain a stale result.
12511 S.SpecialMemberCache.clear();
12512 else {
12513 // Register a note to be produced if we encounter an error while
12514 // declaring the special member.
12515 Sema::CodeSynthesisContext Ctx;
12516 Ctx.Kind = Sema::CodeSynthesisContext::DeclaringSpecialMember;
12517 // FIXME: We don't have a location to use here. Using the class's
12518 // location maintains the fiction that we declare all special members
12519 // with the class, but (1) it's not clear that lying about that helps our
12520 // users understand what's going on, and (2) there may be outer contexts
12521 // on the stack (some of which are relevant) and printing them exposes
12522 // our lies.
12523 Ctx.PointOfInstantiation = RD->getLocation();
12524 Ctx.Entity = RD;
12525 Ctx.SpecialMember = CSM;
12526 S.pushCodeSynthesisContext(Ctx);
12527 }
12528 }
12529 ~DeclaringSpecialMember() {
12530 if (!WasAlreadyBeingDeclared) {
12531 S.SpecialMembersBeingDeclared.erase(D);
12532 S.popCodeSynthesisContext();
12533 }
12534 }
12535
12536 /// Are we already trying to declare this special member?
12537 bool isAlreadyBeingDeclared() const {
12538 return WasAlreadyBeingDeclared;
12539 }
12540 };
12541 }
12542
12543 void Sema::CheckImplicitSpecialMemberDeclaration(Scope *S, FunctionDecl *FD) {
12544 // Look up any existing declarations, but don't trigger declaration of all
12545 // implicit special members with this name.
12546 DeclarationName Name = FD->getDeclName();
12547 LookupResult R(*this, Name, SourceLocation(), LookupOrdinaryName,
12548 ForExternalRedeclaration);
12549 for (auto *D : FD->getParent()->lookup(Name))
12550 if (auto *Acceptable = R.getAcceptableDecl(D))
12551 R.addDecl(Acceptable);
12552 R.resolveKind();
12553 R.suppressDiagnostics();
12554
12555 CheckFunctionDeclaration(S, FD, R, /*IsMemberSpecialization*/false);
12556 }
12557
12558 void Sema::setupImplicitSpecialMemberType(CXXMethodDecl *SpecialMem,
12559 QualType ResultTy,
12560 ArrayRef<QualType> Args) {
12561 // Build an exception specification pointing back at this constructor.
12562 FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, SpecialMem);
12563
12564 LangAS AS = getDefaultCXXMethodAddrSpace();
12565 if (AS != LangAS::Default) {
12566 EPI.TypeQuals.addAddressSpace(AS);
12567 }
12568
12569 auto QT = Context.getFunctionType(ResultTy, Args, EPI);
12570 SpecialMem->setType(QT);
12571 }
12572
12573 CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor(
12574 CXXRecordDecl *ClassDecl) {
12575 // C++ [class.ctor]p5:
12576 // A default constructor for a class X is a constructor of class X
12577 // that can be called without an argument. If there is no
12578 // user-declared constructor for class X, a default constructor is
12579 // implicitly declared. An implicitly-declared default constructor
12580 // is an inline public member of its class.
12581 assert(ClassDecl->needsImplicitDefaultConstructor() &&
12582 "Should not build implicit default constructor!");
12583
12584 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor);
12585 if (DSM.isAlreadyBeingDeclared())
12586 return nullptr;
12587
12588 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
12589 CXXDefaultConstructor,
12590 false);
12591
12592 // Create the actual constructor declaration.
12593 CanQualType ClassType
12594 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
12595 SourceLocation ClassLoc = ClassDecl->getLocation();
12596 DeclarationName Name
12597 = Context.DeclarationNames.getCXXConstructorName(ClassType);
12598 DeclarationNameInfo NameInfo(Name, ClassLoc);
12599 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create(
12600 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/ QualType(),
12601 /*TInfo=*/nullptr, ExplicitSpecifier(),
12602 /*isInline=*/true, /*isImplicitlyDeclared=*/true,
12603 Constexpr ? CSK_constexpr : CSK_unspecified);
12604 DefaultCon->setAccess(AS_public);
12605 DefaultCon->setDefaulted();
12606
12607 if (getLangOpts().CUDA) {
12608 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXDefaultConstructor,
12609 DefaultCon,
12610 /* ConstRHS */ false,
12611 /* Diagnose */ false);
12612 }
12613
12614 setupImplicitSpecialMemberType(DefaultCon, Context.VoidTy, None);
12615
12616 // We don't need to use SpecialMemberIsTrivial here; triviality for default
12617 // constructors is easy to compute.
12618 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor());
12619
12620 // Note that we have declared this constructor.
12621 ++getASTContext().NumImplicitDefaultConstructorsDeclared;
12622
12623 Scope *S = getScopeForContext(ClassDecl);
12624 CheckImplicitSpecialMemberDeclaration(S, DefaultCon);
12625
12626 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor))
12627 SetDeclDeleted(DefaultCon, ClassLoc);
12628
12629 if (S)
12630 PushOnScopeChains(DefaultCon, S, false);
12631 ClassDecl->addDecl(DefaultCon);
12632
12633 return DefaultCon;
12634 }
12635
12636 void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
12637 CXXConstructorDecl *Constructor) {
12638 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() &&
12639 !Constructor->doesThisDeclarationHaveABody() &&
12640 !Constructor->isDeleted()) &&
12641 "DefineImplicitDefaultConstructor - call it for implicit default ctor");
12642 if (Constructor->willHaveBody() || Constructor->isInvalidDecl())
12643 return;
12644
12645 CXXRecordDecl *ClassDecl = Constructor->getParent();
12646 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor");
12647
12648 SynthesizedFunctionScope Scope(*this, Constructor);
12649
12650 // The exception specification is needed because we are defining the
12651 // function.
12652 ResolveExceptionSpec(CurrentLocation,
12653 Constructor->getType()->castAs<FunctionProtoType>());
12654 MarkVTableUsed(CurrentLocation, ClassDecl);
12655
12656 // Add a context note for diagnostics produced after this point.
12657 Scope.addContextNote(CurrentLocation);
12658
12659 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false)) {
12660 Constructor->setInvalidDecl();
12661 return;
12662 }
12663
12664 SourceLocation Loc = Constructor->getEndLoc().isValid()
12665 ? Constructor->getEndLoc()
12666 : Constructor->getLocation();
12667 Constructor->setBody(new (Context) CompoundStmt(Loc));
12668 Constructor->markUsed(Context);
12669
12670 if (ASTMutationListener *L = getASTMutationListener()) {
12671 L->CompletedImplicitDefinition(Constructor);
12672 }
12673
12674 DiagnoseUninitializedFields(*this, Constructor);
12675 }
12676
12677 void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) {
12678 // Perform any delayed checks on exception specifications.
12679 CheckDelayedMemberExceptionSpecs();
12680 }
12681
12682 /// Find or create the fake constructor we synthesize to model constructing an
12683 /// object of a derived class via a constructor of a base class.
12684 CXXConstructorDecl *
12685 Sema::findInheritingConstructor(SourceLocation Loc,
12686 CXXConstructorDecl *BaseCtor,
12687 ConstructorUsingShadowDecl *Shadow) {
12688 CXXRecordDecl *Derived = Shadow->getParent();
12689 SourceLocation UsingLoc = Shadow->getLocation();
12690
12691 // FIXME: Add a new kind of DeclarationName for an inherited constructor.
12692 // For now we use the name of the base class constructor as a member of the
12693 // derived class to indicate a (fake) inherited constructor name.
12694 DeclarationName Name = BaseCtor->getDeclName();
12695
12696 // Check to see if we already have a fake constructor for this inherited
12697 // constructor call.
12698 for (NamedDecl *Ctor : Derived->lookup(Name))
12699 if (declaresSameEntity(cast<CXXConstructorDecl>(Ctor)
12700 ->getInheritedConstructor()
12701 .getConstructor(),
12702 BaseCtor))
12703 return cast<CXXConstructorDecl>(Ctor);
12704
12705 DeclarationNameInfo NameInfo(Name, UsingLoc);
12706 TypeSourceInfo *TInfo =
12707 Context.getTrivialTypeSourceInfo(BaseCtor->getType(), UsingLoc);
12708 FunctionProtoTypeLoc ProtoLoc =
12709 TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>();
12710
12711 // Check the inherited constructor is valid and find the list of base classes
12712 // from which it was inherited.
12713 InheritedConstructorInfo ICI(*this, Loc, Shadow);
12714
12715 bool Constexpr =
12716 BaseCtor->isConstexpr() &&
12717 defaultedSpecialMemberIsConstexpr(*this, Derived, CXXDefaultConstructor,
12718 false, BaseCtor, &ICI);
12719
12720 CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create(
12721 Context, Derived, UsingLoc, NameInfo, TInfo->getType(), TInfo,
12722 BaseCtor->getExplicitSpecifier(), /*isInline=*/true,
12723 /*isImplicitlyDeclared=*/true,
12724 Constexpr ? BaseCtor->getConstexprKind() : CSK_unspecified,
12725 InheritedConstructor(Shadow, BaseCtor),
12726 BaseCtor->getTrailingRequiresClause());
12727 if (Shadow->isInvalidDecl())
12728 DerivedCtor->setInvalidDecl();
12729
12730 // Build an unevaluated exception specification for this fake constructor.
12731 const FunctionProtoType *FPT = TInfo->getType()->castAs<FunctionProtoType>();
12732 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
12733 EPI.ExceptionSpec.Type = EST_Unevaluated;
12734 EPI.ExceptionSpec.SourceDecl = DerivedCtor;
12735 DerivedCtor->setType(Context.getFunctionType(FPT->getReturnType(),
12736 FPT->getParamTypes(), EPI));
12737
12738 // Build the parameter declarations.
12739 SmallVector<ParmVarDecl *, 16> ParamDecls;
12740 for (unsigned I = 0, N = FPT->getNumParams(); I != N; ++I) {
12741 TypeSourceInfo *TInfo =
12742 Context.getTrivialTypeSourceInfo(FPT->getParamType(I), UsingLoc);
12743 ParmVarDecl *PD = ParmVarDecl::Create(
12744 Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/nullptr,
12745 FPT->getParamType(I), TInfo, SC_None, /*DefArg=*/nullptr);
12746 PD->setScopeInfo(0, I);
12747 PD->setImplicit();
12748 // Ensure attributes are propagated onto parameters (this matters for
12749 // format, pass_object_size, ...).
12750 mergeDeclAttributes(PD, BaseCtor->getParamDecl(I));
12751 ParamDecls.push_back(PD);
12752 ProtoLoc.setParam(I, PD);
12753 }
12754
12755 // Set up the new constructor.
12756 assert(!BaseCtor->isDeleted() && "should not use deleted constructor");
12757 DerivedCtor->setAccess(BaseCtor->getAccess());
12758 DerivedCtor->setParams(ParamDecls);
12759 Derived->addDecl(DerivedCtor);
12760
12761 if (ShouldDeleteSpecialMember(DerivedCtor, CXXDefaultConstructor, &ICI))
12762 SetDeclDeleted(DerivedCtor, UsingLoc);
12763
12764 return DerivedCtor;
12765 }
12766
12767 void Sema::NoteDeletedInheritingConstructor(CXXConstructorDecl *Ctor) {
12768 InheritedConstructorInfo ICI(*this, Ctor->getLocation(),
12769 Ctor->getInheritedConstructor().getShadowDecl());
12770 ShouldDeleteSpecialMember(Ctor, CXXDefaultConstructor, &ICI,
12771 /*Diagnose*/true);
12772 }
12773
12774 void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation,
12775 CXXConstructorDecl *Constructor) {
12776 CXXRecordDecl *ClassDecl = Constructor->getParent();
12777 assert(Constructor->getInheritedConstructor() &&
12778 !Constructor->doesThisDeclarationHaveABody() &&
12779 !Constructor->isDeleted());
12780 if (Constructor->willHaveBody() || Constructor->isInvalidDecl())
12781 return;
12782
12783 // Initializations are performed "as if by a defaulted default constructor",
12784 // so enter the appropriate scope.
12785 SynthesizedFunctionScope Scope(*this, Constructor);
12786
12787 // The exception specification is needed because we are defining the
12788 // function.
12789 ResolveExceptionSpec(CurrentLocation,
12790 Constructor->getType()->castAs<FunctionProtoType>());
12791 MarkVTableUsed(CurrentLocation, ClassDecl);
12792
12793 // Add a context note for diagnostics produced after this point.
12794 Scope.addContextNote(CurrentLocation);
12795
12796 ConstructorUsingShadowDecl *Shadow =
12797 Constructor->getInheritedConstructor().getShadowDecl();
12798 CXXConstructorDecl *InheritedCtor =
12799 Constructor->getInheritedConstructor().getConstructor();
12800
12801 // [class.inhctor.init]p1:
12802 // initialization proceeds as if a defaulted default constructor is used to
12803 // initialize the D object and each base class subobject from which the
12804 // constructor was inherited
12805
12806 InheritedConstructorInfo ICI(*this, CurrentLocation, Shadow);
12807 CXXRecordDecl *RD = Shadow->getParent();
12808 SourceLocation InitLoc = Shadow->getLocation();
12809
12810 // Build explicit initializers for all base classes from which the
12811 // constructor was inherited.
12812 SmallVector<CXXCtorInitializer*, 8> Inits;
12813 for (bool VBase : {false, true}) {
12814 for (CXXBaseSpecifier &B : VBase ? RD->vbases() : RD->bases()) {
12815 if (B.isVirtual() != VBase)
12816 continue;
12817
12818 auto *BaseRD = B.getType()->getAsCXXRecordDecl();
12819 if (!BaseRD)
12820 continue;
12821
12822 auto BaseCtor = ICI.findConstructorForBase(BaseRD, InheritedCtor);
12823 if (!BaseCtor.first)
12824 continue;
12825
12826 MarkFunctionReferenced(CurrentLocation, BaseCtor.first);
12827 ExprResult Init = new (Context) CXXInheritedCtorInitExpr(
12828 InitLoc, B.getType(), BaseCtor.first, VBase, BaseCtor.second);
12829
12830 auto *TInfo = Context.getTrivialTypeSourceInfo(B.getType(), InitLoc);
12831 Inits.push_back(new (Context) CXXCtorInitializer(
12832 Context, TInfo, VBase, InitLoc, Init.get(), InitLoc,
12833 SourceLocation()));
12834 }
12835 }
12836
12837 // We now proceed as if for a defaulted default constructor, with the relevant
12838 // initializers replaced.
12839
12840 if (SetCtorInitializers(Constructor, /*AnyErrors*/false, Inits)) {
12841 Constructor->setInvalidDecl();
12842 return;
12843 }
12844
12845 Constructor->setBody(new (Context) CompoundStmt(InitLoc));
12846 Constructor->markUsed(Context);
12847
12848 if (ASTMutationListener *L = getASTMutationListener()) {
12849 L->CompletedImplicitDefinition(Constructor);
12850 }
12851
12852 DiagnoseUninitializedFields(*this, Constructor);
12853 }
12854
12855 CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) {
12856 // C++ [class.dtor]p2:
12857 // If a class has no user-declared destructor, a destructor is
12858 // declared implicitly. An implicitly-declared destructor is an
12859 // inline public member of its class.
12860 assert(ClassDecl->needsImplicitDestructor());
12861
12862 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor);
12863 if (DSM.isAlreadyBeingDeclared())
12864 return nullptr;
12865
12866 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
12867 CXXDestructor,
12868 false);
12869
12870 // Create the actual destructor declaration.
12871 CanQualType ClassType
12872 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
12873 SourceLocation ClassLoc = ClassDecl->getLocation();
12874 DeclarationName Name
12875 = Context.DeclarationNames.getCXXDestructorName(ClassType);
12876 DeclarationNameInfo NameInfo(Name, ClassLoc);
12877 CXXDestructorDecl *Destructor =
12878 CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo,
12879 QualType(), nullptr, /*isInline=*/true,
12880 /*isImplicitlyDeclared=*/true,
12881 Constexpr ? CSK_constexpr : CSK_unspecified);
12882 Destructor->setAccess(AS_public);
12883 Destructor->setDefaulted();
12884
12885 if (getLangOpts().CUDA) {
12886 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXDestructor,
12887 Destructor,
12888 /* ConstRHS */ false,
12889 /* Diagnose */ false);
12890 }
12891
12892 setupImplicitSpecialMemberType(Destructor, Context.VoidTy, None);
12893
12894 // We don't need to use SpecialMemberIsTrivial here; triviality for
12895 // destructors is easy to compute.
12896 Destructor->setTrivial(ClassDecl->hasTrivialDestructor());
12897 Destructor->setTrivialForCall(ClassDecl->hasAttr<TrivialABIAttr>() ||
12898 ClassDecl->hasTrivialDestructorForCall());
12899
12900 // Note that we have declared this destructor.
12901 ++getASTContext().NumImplicitDestructorsDeclared;
12902
12903 Scope *S = getScopeForContext(ClassDecl);
12904 CheckImplicitSpecialMemberDeclaration(S, Destructor);
12905
12906 // We can't check whether an implicit destructor is deleted before we complete
12907 // the definition of the class, because its validity depends on the alignment
12908 // of the class. We'll check this from ActOnFields once the class is complete.
12909 if (ClassDecl->isCompleteDefinition() &&
12910 ShouldDeleteSpecialMember(Destructor, CXXDestructor))
12911 SetDeclDeleted(Destructor, ClassLoc);
12912
12913 // Introduce this destructor into its scope.
12914 if (S)
12915 PushOnScopeChains(Destructor, S, false);
12916 ClassDecl->addDecl(Destructor);
12917
12918 return Destructor;
12919 }
12920
12921 void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation,
12922 CXXDestructorDecl *Destructor) {
12923 assert((Destructor->isDefaulted() &&
12924 !Destructor->doesThisDeclarationHaveABody() &&
12925 !Destructor->isDeleted()) &&
12926 "DefineImplicitDestructor - call it for implicit default dtor");
12927 if (Destructor->willHaveBody() || Destructor->isInvalidDecl())
12928 return;
12929
12930 CXXRecordDecl *ClassDecl = Destructor->getParent();
12931 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor");
12932
12933 SynthesizedFunctionScope Scope(*this, Destructor);
12934
12935 // The exception specification is needed because we are defining the
12936 // function.
12937 ResolveExceptionSpec(CurrentLocation,
12938 Destructor->getType()->castAs<FunctionProtoType>());
12939 MarkVTableUsed(CurrentLocation, ClassDecl);
12940
12941 // Add a context note for diagnostics produced after this point.
12942 Scope.addContextNote(CurrentLocation);
12943
12944 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
12945 Destructor->getParent());
12946
12947 if (CheckDestructor(Destructor)) {
12948 Destructor->setInvalidDecl();
12949 return;
12950 }
12951
12952 SourceLocation Loc = Destructor->getEndLoc().isValid()
12953 ? Destructor->getEndLoc()
12954 : Destructor->getLocation();
12955 Destructor->setBody(new (Context) CompoundStmt(Loc));
12956 Destructor->markUsed(Context);
12957
12958 if (ASTMutationListener *L = getASTMutationListener()) {
12959 L->CompletedImplicitDefinition(Destructor);
12960 }
12961 }
12962
12963 /// Perform any semantic analysis which needs to be delayed until all
12964 /// pending class member declarations have been parsed.
12965 void Sema::ActOnFinishCXXMemberDecls() {
12966 // If the context is an invalid C++ class, just suppress these checks.
12967 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) {
12968 if (Record->isInvalidDecl()) {
12969 DelayedOverridingExceptionSpecChecks.clear();
12970 DelayedEquivalentExceptionSpecChecks.clear();
12971 return;
12972 }
12973 checkForMultipleExportedDefaultConstructors(*this, Record);
12974 }
12975 }
12976
12977 void Sema::ActOnFinishCXXNonNestedClass() {
12978 referenceDLLExportedClassMethods();
12979
12980 if (!DelayedDllExportMemberFunctions.empty()) {
12981 SmallVector<CXXMethodDecl*, 4> WorkList;
12982 std::swap(DelayedDllExportMemberFunctions, WorkList);
12983 for (CXXMethodDecl *M : WorkList) {
12984 DefineImplicitSpecialMember(*this, M, M->getLocation());
12985
12986 // Pass the method to the consumer to get emitted. This is not necessary
12987 // for explicit instantiation definitions, as they will get emitted
12988 // anyway.
12989 if (M->getParent()->getTemplateSpecializationKind() !=
12990 TSK_ExplicitInstantiationDefinition)
12991 ActOnFinishInlineFunctionDef(M);
12992 }
12993 }
12994 }
12995
12996 void Sema::referenceDLLExportedClassMethods() {
12997 if (!DelayedDllExportClasses.empty()) {
12998 // Calling ReferenceDllExportedMembers might cause the current function to
12999 // be called again, so use a local copy of DelayedDllExportClasses.
13000 SmallVector<CXXRecordDecl *, 4> WorkList;
13001 std::swap(DelayedDllExportClasses, WorkList);
13002 for (CXXRecordDecl *Class : WorkList)
13003 ReferenceDllExportedMembers(*this, Class);
13004 }
13005 }
13006
13007 void Sema::AdjustDestructorExceptionSpec(CXXDestructorDecl *Destructor) {
13008 assert(getLangOpts().CPlusPlus11 &&
13009 "adjusting dtor exception specs was introduced in c++11");
13010
13011 if (Destructor->isDependentContext())
13012 return;
13013
13014 // C++11 [class.dtor]p3:
13015 // A declaration of a destructor that does not have an exception-
13016 // specification is implicitly considered to have the same exception-
13017 // specification as an implicit declaration.
13018 const auto *DtorType = Destructor->getType()->castAs<FunctionProtoType>();
13019 if (DtorType->hasExceptionSpec())
13020 return;
13021
13022 // Replace the destructor's type, building off the existing one. Fortunately,
13023 // the only thing of interest in the destructor type is its extended info.
13024 // The return and arguments are fixed.
13025 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo();
13026 EPI.ExceptionSpec.Type = EST_Unevaluated;
13027 EPI.ExceptionSpec.SourceDecl = Destructor;
13028 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI));
13029
13030 // FIXME: If the destructor has a body that could throw, and the newly created
13031 // spec doesn't allow exceptions, we should emit a warning, because this
13032 // change in behavior can break conforming C++03 programs at runtime.
13033 // However, we don't have a body or an exception specification yet, so it
13034 // needs to be done somewhere else.
13035 }
13036
13037 namespace {
13038 /// An abstract base class for all helper classes used in building the
13039 // copy/move operators. These classes serve as factory functions and help us
13040 // avoid using the same Expr* in the AST twice.
13041 class ExprBuilder {
13042 ExprBuilder(const ExprBuilder&) = delete;
13043 ExprBuilder &operator=(const ExprBuilder&) = delete;
13044
13045 protected:
13046 static Expr *assertNotNull(Expr *E) {
13047 assert(E && "Expression construction must not fail.");
13048 return E;
13049 }
13050
13051 public:
13052 ExprBuilder() {}
13053 virtual ~ExprBuilder() {}
13054
13055 virtual Expr *build(Sema &S, SourceLocation Loc) const = 0;
13056 };
13057
13058 class RefBuilder: public ExprBuilder {
13059 VarDecl *Var;
13060 QualType VarType;
13061
13062 public:
13063 Expr *build(Sema &S, SourceLocation Loc) const override {
13064 return assertNotNull(S.BuildDeclRefExpr(Var, VarType, VK_LValue, Loc));
13065 }
13066
13067 RefBuilder(VarDecl *Var, QualType VarType)
13068 : Var(Var), VarType(VarType) {}
13069 };
13070
13071 class ThisBuilder: public ExprBuilder {
13072 public:
13073 Expr *build(Sema &S, SourceLocation Loc) const override {
13074 return assertNotNull(S.ActOnCXXThis(Loc).getAs<Expr>());
13075 }
13076 };
13077
13078 class CastBuilder: public ExprBuilder {
13079 const ExprBuilder &Builder;
13080 QualType Type;
13081 ExprValueKind Kind;
13082 const CXXCastPath &Path;
13083
13084 public:
13085 Expr *build(Sema &S, SourceLocation Loc) const override {
13086 return assertNotNull(S.ImpCastExprToType(Builder.build(S, Loc), Type,
13087 CK_UncheckedDerivedToBase, Kind,
13088 &Path).get());
13089 }
13090
13091 CastBuilder(const ExprBuilder &Builder, QualType Type, ExprValueKind Kind,
13092 const CXXCastPath &Path)
13093 : Builder(Builder), Type(Type), Kind(Kind), Path(Path) {}
13094 };
13095
13096 class DerefBuilder: public ExprBuilder {
13097 const ExprBuilder &Builder;
13098
13099 public:
13100 Expr *build(Sema &S, SourceLocation Loc) const override {
13101 return assertNotNull(
13102 S.CreateBuiltinUnaryOp(Loc, UO_Deref, Builder.build(S, Loc)).get());
13103 }
13104
13105 DerefBuilder(const ExprBuilder &Builder) : Builder(Builder) {}
13106 };
13107
13108 class MemberBuilder: public ExprBuilder {
13109 const ExprBuilder &Builder;
13110 QualType Type;
13111 CXXScopeSpec SS;
13112 bool IsArrow;
13113 LookupResult &MemberLookup;
13114
13115 public:
13116 Expr *build(Sema &S, SourceLocation Loc) const override {
13117 return assertNotNull(S.BuildMemberReferenceExpr(
13118 Builder.build(S, Loc), Type, Loc, IsArrow, SS, SourceLocation(),
13119 nullptr, MemberLookup, nullptr, nullptr).get());
13120 }
13121
13122 MemberBuilder(const ExprBuilder &Builder, QualType Type, bool IsArrow,
13123 LookupResult &MemberLookup)
13124 : Builder(Builder), Type(Type), IsArrow(IsArrow),
13125 MemberLookup(MemberLookup) {}
13126 };
13127
13128 class MoveCastBuilder: public ExprBuilder {
13129 const ExprBuilder &Builder;
13130
13131 public:
13132 Expr *build(Sema &S, SourceLocation Loc) const override {
13133 return assertNotNull(CastForMoving(S, Builder.build(S, Loc)));
13134 }
13135
13136 MoveCastBuilder(const ExprBuilder &Builder) : Builder(Builder) {}
13137 };
13138
13139 class LvalueConvBuilder: public ExprBuilder {
13140 const ExprBuilder &Builder;
13141
13142 public:
13143 Expr *build(Sema &S, SourceLocation Loc) const override {
13144 return assertNotNull(
13145 S.DefaultLvalueConversion(Builder.build(S, Loc)).get());
13146 }
13147
13148 LvalueConvBuilder(const ExprBuilder &Builder) : Builder(Builder) {}
13149 };
13150
13151 class SubscriptBuilder: public ExprBuilder {
13152 const ExprBuilder &Base;
13153 const ExprBuilder &Index;
13154
13155 public:
13156 Expr *build(Sema &S, SourceLocation Loc) const override {
13157 return assertNotNull(S.CreateBuiltinArraySubscriptExpr(
13158 Base.build(S, Loc), Loc, Index.build(S, Loc), Loc).get());
13159 }
13160
13161 SubscriptBuilder(const ExprBuilder &Base, const ExprBuilder &Index)
13162 : Base(Base), Index(Index) {}
13163 };
13164
13165 } // end anonymous namespace
13166
13167 /// When generating a defaulted copy or move assignment operator, if a field
13168 /// should be copied with __builtin_memcpy rather than via explicit assignments,
13169 /// do so. This optimization only applies for arrays of scalars, and for arrays
13170 /// of class type where the selected copy/move-assignment operator is trivial.
13171 static StmtResult
13172 buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T,
13173 const ExprBuilder &ToB, const ExprBuilder &FromB) {
13174 // Compute the size of the memory buffer to be copied.
13175 QualType SizeType = S.Context.getSizeType();
13176 llvm::APInt Size(S.Context.getTypeSize(SizeType),
13177 S.Context.getTypeSizeInChars(T).getQuantity());
13178
13179 // Take the address of the field references for "from" and "to". We
13180 // directly construct UnaryOperators here because semantic analysis
13181 // does not permit us to take the address of an xvalue.
13182 Expr *From = FromB.build(S, Loc);
13183 From = new (S.Context) UnaryOperator(From, UO_AddrOf,
13184 S.Context.getPointerType(From->getType()),
13185 VK_RValue, OK_Ordinary, Loc, false);
13186 Expr *To = ToB.build(S, Loc);
13187 To = new (S.Context) UnaryOperator(To, UO_AddrOf,
13188 S.Context.getPointerType(To->getType()),
13189 VK_RValue, OK_Ordinary, Loc, false);
13190
13191 const Type *E = T->getBaseElementTypeUnsafe();
13192 bool NeedsCollectableMemCpy =
13193 E->isRecordType() &&
13194 E->castAs<RecordType>()->getDecl()->hasObjectMember();
13195
13196 // Create a reference to the __builtin_objc_memmove_collectable function
13197 StringRef MemCpyName = NeedsCollectableMemCpy ?
13198 "__builtin_objc_memmove_collectable" :
13199 "__builtin_memcpy";
13200 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc,
13201 Sema::LookupOrdinaryName);
13202 S.LookupName(R, S.TUScope, true);
13203
13204 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>();
13205 if (!MemCpy)
13206 // Something went horribly wrong earlier, and we will have complained
13207 // about it.
13208 return StmtError();
13209
13210 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy,
13211 VK_RValue, Loc, nullptr);
13212 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail");
13213
13214 Expr *CallArgs[] = {
13215 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc)
13216 };
13217 ExprResult Call = S.BuildCallExpr(/*Scope=*/nullptr, MemCpyRef.get(),
13218 Loc, CallArgs, Loc);
13219
13220 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!");
13221 return Call.getAs<Stmt>();
13222 }
13223
13224 /// Builds a statement that copies/moves the given entity from \p From to
13225 /// \c To.
13226 ///
13227 /// This routine is used to copy/move the members of a class with an
13228 /// implicitly-declared copy/move assignment operator. When the entities being
13229 /// copied are arrays, this routine builds for loops to copy them.
13230 ///
13231 /// \param S The Sema object used for type-checking.
13232 ///
13233 /// \param Loc The location where the implicit copy/move is being generated.
13234 ///
13235 /// \param T The type of the expressions being copied/moved. Both expressions
13236 /// must have this type.
13237 ///
13238 /// \param To The expression we are copying/moving to.
13239 ///
13240 /// \param From The expression we are copying/moving from.
13241 ///
13242 /// \param CopyingBaseSubobject Whether we're copying/moving a base subobject.
13243 /// Otherwise, it's a non-static member subobject.
13244 ///
13245 /// \param Copying Whether we're copying or moving.
13246 ///
13247 /// \param Depth Internal parameter recording the depth of the recursion.
13248 ///
13249 /// \returns A statement or a loop that copies the expressions, or StmtResult(0)
13250 /// if a memcpy should be used instead.
13251 static StmtResult
13252 buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T,
13253 const ExprBuilder &To, const ExprBuilder &From,
13254 bool CopyingBaseSubobject, bool Copying,
13255 unsigned Depth = 0) {
13256 // C++11 [class.copy]p28:
13257 // Each subobject is assigned in the manner appropriate to its type:
13258 //
13259 // - if the subobject is of class type, as if by a call to operator= with
13260 // the subobject as the object expression and the corresponding
13261 // subobject of x as a single function argument (as if by explicit
13262 // qualification; that is, ignoring any possible virtual overriding
13263 // functions in more derived classes);
13264 //
13265 // C++03 [class.copy]p13:
13266 // - if the subobject is of class type, the copy assignment operator for
13267 // the class is used (as if by explicit qualification; that is,
13268 // ignoring any possible virtual overriding functions in more derived
13269 // classes);
13270 if (const RecordType *RecordTy = T->getAs<RecordType>()) {
13271 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
13272
13273 // Look for operator=.
13274 DeclarationName Name
13275 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal);
13276 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName);
13277 S.LookupQualifiedName(OpLookup, ClassDecl, false);
13278
13279 // Prior to C++11, filter out any result that isn't a copy/move-assignment
13280 // operator.
13281 if (!S.getLangOpts().CPlusPlus11) {
13282 LookupResult::Filter F = OpLookup.makeFilter();
13283 while (F.hasNext()) {
13284 NamedDecl *D = F.next();
13285 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
13286 if (Method->isCopyAssignmentOperator() ||
13287 (!Copying && Method->isMoveAssignmentOperator()))
13288 continue;
13289
13290 F.erase();
13291 }
13292 F.done();
13293 }
13294
13295 // Suppress the protected check (C++ [class.protected]) for each of the
13296 // assignment operators we found. This strange dance is required when
13297 // we're assigning via a base classes's copy-assignment operator. To
13298 // ensure that we're getting the right base class subobject (without
13299 // ambiguities), we need to cast "this" to that subobject type; to
13300 // ensure that we don't go through the virtual call mechanism, we need
13301 // to qualify the operator= name with the base class (see below). However,
13302 // this means that if the base class has a protected copy assignment
13303 // operator, the protected member access check will fail. So, we
13304 // rewrite "protected" access to "public" access in this case, since we
13305 // know by construction that we're calling from a derived class.
13306 if (CopyingBaseSubobject) {
13307 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end();
13308 L != LEnd; ++L) {
13309 if (L.getAccess() == AS_protected)
13310 L.setAccess(AS_public);
13311 }
13312 }
13313
13314 // Create the nested-name-specifier that will be used to qualify the
13315 // reference to operator=; this is required to suppress the virtual
13316 // call mechanism.
13317 CXXScopeSpec SS;
13318 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr());
13319 SS.MakeTrivial(S.Context,
13320 NestedNameSpecifier::Create(S.Context, nullptr, false,
13321 CanonicalT),
13322 Loc);
13323
13324 // Create the reference to operator=.
13325 ExprResult OpEqualRef
13326 = S.BuildMemberReferenceExpr(To.build(S, Loc), T, Loc, /*IsArrow=*/false,
13327 SS, /*TemplateKWLoc=*/SourceLocation(),
13328 /*FirstQualifierInScope=*/nullptr,
13329 OpLookup,
13330 /*TemplateArgs=*/nullptr, /*S*/nullptr,
13331 /*SuppressQualifierCheck=*/true);
13332 if (OpEqualRef.isInvalid())
13333 return StmtError();
13334
13335 // Build the call to the assignment operator.
13336
13337 Expr *FromInst = From.build(S, Loc);
13338 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/nullptr,
13339 OpEqualRef.getAs<Expr>(),
13340 Loc, FromInst, Loc);
13341 if (Call.isInvalid())
13342 return StmtError();
13343
13344 // If we built a call to a trivial 'operator=' while copying an array,
13345 // bail out. We'll replace the whole shebang with a memcpy.
13346 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get());
13347 if (CE && CE->getMethodDecl()->isTrivial() && Depth)
13348 return StmtResult((Stmt*)nullptr);
13349
13350 // Convert to an expression-statement, and clean up any produced
13351 // temporaries.
13352 return S.ActOnExprStmt(Call);
13353 }
13354
13355 // - if the subobject is of scalar type, the built-in assignment
13356 // operator is used.
13357 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T);
13358 if (!ArrayTy) {
13359 ExprResult Assignment = S.CreateBuiltinBinOp(
13360 Loc, BO_Assign, To.build(S, Loc), From.build(S, Loc));
13361 if (Assignment.isInvalid())
13362 return StmtError();
13363 return S.ActOnExprStmt(Assignment);
13364 }
13365
13366 // - if the subobject is an array, each element is assigned, in the
13367 // manner appropriate to the element type;
13368
13369 // Construct a loop over the array bounds, e.g.,
13370 //
13371 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0)
13372 //
13373 // that will copy each of the array elements.
13374 QualType SizeType = S.Context.getSizeType();
13375
13376 // Create the iteration variable.
13377 IdentifierInfo *IterationVarName = nullptr;
13378 {
13379 SmallString<8> Str;
13380 llvm::raw_svector_ostream OS(Str);
13381 OS << "__i" << Depth;
13382 IterationVarName = &S.Context.Idents.get(OS.str());
13383 }
13384 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc,
13385 IterationVarName, SizeType,
13386 S.Context.getTrivialTypeSourceInfo(SizeType, Loc),
13387 SC_None);
13388
13389 // Initialize the iteration variable to zero.
13390 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0);
13391 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc));
13392
13393 // Creates a reference to the iteration variable.
13394 RefBuilder IterationVarRef(IterationVar, SizeType);
13395 LvalueConvBuilder IterationVarRefRVal(IterationVarRef);
13396
13397 // Create the DeclStmt that holds the iteration variable.
13398 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc);
13399
13400 // Subscript the "from" and "to" expressions with the iteration variable.
13401 SubscriptBuilder FromIndexCopy(From, IterationVarRefRVal);
13402 MoveCastBuilder FromIndexMove(FromIndexCopy);
13403 const ExprBuilder *FromIndex;
13404 if (Copying)
13405 FromIndex = &FromIndexCopy;
13406 else
13407 FromIndex = &FromIndexMove;
13408
13409 SubscriptBuilder ToIndex(To, IterationVarRefRVal);
13410
13411 // Build the copy/move for an individual element of the array.
13412 StmtResult Copy =
13413 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(),
13414 ToIndex, *FromIndex, CopyingBaseSubobject,
13415 Copying, Depth + 1);
13416 // Bail out if copying fails or if we determined that we should use memcpy.
13417 if (Copy.isInvalid() || !Copy.get())
13418 return Copy;
13419
13420 // Create the comparison against the array bound.
13421 llvm::APInt Upper
13422 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType));
13423 Expr *Comparison
13424 = new (S.Context) BinaryOperator(IterationVarRefRVal.build(S, Loc),
13425 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc),
13426 BO_NE, S.Context.BoolTy,
13427 VK_RValue, OK_Ordinary, Loc, FPOptions());
13428
13429 // Create the pre-increment of the iteration variable. We can determine
13430 // whether the increment will overflow based on the value of the array
13431 // bound.
13432 Expr *Increment = new (S.Context)
13433 UnaryOperator(IterationVarRef.build(S, Loc), UO_PreInc, SizeType,
13434 VK_LValue, OK_Ordinary, Loc, Upper.isMaxValue());
13435
13436 // Construct the loop that copies all elements of this array.
13437 return S.ActOnForStmt(
13438 Loc, Loc, InitStmt,
13439 S.ActOnCondition(nullptr, Loc, Comparison, Sema::ConditionKind::Boolean),
13440 S.MakeFullDiscardedValueExpr(Increment), Loc, Copy.get());
13441 }
13442
13443 static StmtResult
13444 buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T,
13445 const ExprBuilder &To, const ExprBuilder &From,
13446 bool CopyingBaseSubobject, bool Copying) {
13447 // Maybe we should use a memcpy?
13448 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() &&
13449 T.isTriviallyCopyableType(S.Context))
13450 return buildMemcpyForAssignmentOp(S, Loc, T, To, From);
13451
13452 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From,
13453 CopyingBaseSubobject,
13454 Copying, 0));
13455
13456 // If we ended up picking a trivial assignment operator for an array of a
13457 // non-trivially-copyable class type, just emit a memcpy.
13458 if (!Result.isInvalid() && !Result.get())
13459 return buildMemcpyForAssignmentOp(S, Loc, T, To, From);
13460
13461 return Result;
13462 }
13463
13464 CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) {
13465 // Note: The following rules are largely analoguous to the copy
13466 // constructor rules. Note that virtual bases are not taken into account
13467 // for determining the argument type of the operator. Note also that
13468 // operators taking an object instead of a reference are allowed.
13469 assert(ClassDecl->needsImplicitCopyAssignment());
13470
13471 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment);
13472 if (DSM.isAlreadyBeingDeclared())
13473 return nullptr;
13474
13475 QualType ArgType = Context.getTypeDeclType(ClassDecl);
13476 LangAS AS = getDefaultCXXMethodAddrSpace();
13477 if (AS != LangAS::Default)
13478 ArgType = Context.getAddrSpaceQualType(ArgType, AS);
13479 QualType RetType = Context.getLValueReferenceType(ArgType);
13480 bool Const = ClassDecl->implicitCopyAssignmentHasConstParam();
13481 if (Const)
13482 ArgType = ArgType.withConst();
13483
13484 ArgType = Context.getLValueReferenceType(ArgType);
13485
13486 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
13487 CXXCopyAssignment,
13488 Const);
13489
13490 // An implicitly-declared copy assignment operator is an inline public
13491 // member of its class.
13492 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal);
13493 SourceLocation ClassLoc = ClassDecl->getLocation();
13494 DeclarationNameInfo NameInfo(Name, ClassLoc);
13495 CXXMethodDecl *CopyAssignment = CXXMethodDecl::Create(
13496 Context, ClassDecl, ClassLoc, NameInfo, QualType(),
13497 /*TInfo=*/nullptr, /*StorageClass=*/SC_None,
13498 /*isInline=*/true, Constexpr ? CSK_constexpr : CSK_unspecified,
13499 SourceLocation());
13500 CopyAssignment->setAccess(AS_public);
13501 CopyAssignment->setDefaulted();
13502 CopyAssignment->setImplicit();
13503
13504 if (getLangOpts().CUDA) {
13505 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXCopyAssignment,
13506 CopyAssignment,
13507 /* ConstRHS */ Const,
13508 /* Diagnose */ false);
13509 }
13510
13511 setupImplicitSpecialMemberType(CopyAssignment, RetType, ArgType);
13512
13513 // Add the parameter to the operator.
13514 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment,
13515 ClassLoc, ClassLoc,
13516 /*Id=*/nullptr, ArgType,
13517 /*TInfo=*/nullptr, SC_None,
13518 nullptr);
13519 CopyAssignment->setParams(FromParam);
13520
13521 CopyAssignment->setTrivial(
13522 ClassDecl->needsOverloadResolutionForCopyAssignment()
13523 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment)
13524 : ClassDecl->hasTrivialCopyAssignment());
13525
13526 // Note that we have added this copy-assignment operator.
13527 ++getASTContext().NumImplicitCopyAssignmentOperatorsDeclared;
13528
13529 Scope *S = getScopeForContext(ClassDecl);
13530 CheckImplicitSpecialMemberDeclaration(S, CopyAssignment);
13531
13532 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment))
13533 SetDeclDeleted(CopyAssignment, ClassLoc);
13534
13535 if (S)
13536 PushOnScopeChains(CopyAssignment, S, false);
13537 ClassDecl->addDecl(CopyAssignment);
13538
13539 return CopyAssignment;
13540 }
13541
13542 /// Diagnose an implicit copy operation for a class which is odr-used, but
13543 /// which is deprecated because the class has a user-declared copy constructor,
13544 /// copy assignment operator, or destructor.
13545 static void diagnoseDeprecatedCopyOperation(Sema &S, CXXMethodDecl *CopyOp) {
13546 assert(CopyOp->isImplicit());
13547
13548 CXXRecordDecl *RD = CopyOp->getParent();
13549 CXXMethodDecl *UserDeclaredOperation = nullptr;
13550
13551 // In Microsoft mode, assignment operations don't affect constructors and
13552 // vice versa.
13553 if (RD->hasUserDeclaredDestructor()) {
13554 UserDeclaredOperation = RD->getDestructor();
13555 } else if (!isa<CXXConstructorDecl>(CopyOp) &&
13556 RD->hasUserDeclaredCopyConstructor() &&
13557 !S.getLangOpts().MSVCCompat) {
13558 // Find any user-declared copy constructor.
13559 for (auto *I : RD->ctors()) {
13560 if (I->isCopyConstructor()) {
13561 UserDeclaredOperation = I;
13562 break;
13563 }
13564 }
13565 assert(UserDeclaredOperation);
13566 } else if (isa<CXXConstructorDecl>(CopyOp) &&
13567 RD->hasUserDeclaredCopyAssignment() &&
13568 !S.getLangOpts().MSVCCompat) {
13569 // Find any user-declared move assignment operator.
13570 for (auto *I : RD->methods()) {
13571 if (I->isCopyAssignmentOperator()) {
13572 UserDeclaredOperation = I;
13573 break;
13574 }
13575 }
13576 assert(UserDeclaredOperation);
13577 }
13578
13579 if (UserDeclaredOperation && UserDeclaredOperation->isUserProvided()) {
13580 S.Diag(UserDeclaredOperation->getLocation(),
13581 isa<CXXDestructorDecl>(UserDeclaredOperation)
13582 ? diag::warn_deprecated_copy_dtor_operation
13583 : diag::warn_deprecated_copy_operation)
13584 << RD << /*copy assignment*/ !isa<CXXConstructorDecl>(CopyOp);
13585 }
13586 }
13587
13588 void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation,
13589 CXXMethodDecl *CopyAssignOperator) {
13590 assert((CopyAssignOperator->isDefaulted() &&
13591 CopyAssignOperator->isOverloadedOperator() &&
13592 CopyAssignOperator->getOverloadedOperator() == OO_Equal &&
13593 !CopyAssignOperator->doesThisDeclarationHaveABody() &&
13594 !CopyAssignOperator->isDeleted()) &&
13595 "DefineImplicitCopyAssignment called for wrong function");
13596 if (CopyAssignOperator->willHaveBody() || CopyAssignOperator->isInvalidDecl())
13597 return;
13598
13599 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent();
13600 if (ClassDecl->isInvalidDecl()) {
13601 CopyAssignOperator->setInvalidDecl();
13602 return;
13603 }
13604
13605 SynthesizedFunctionScope Scope(*this, CopyAssignOperator);
13606
13607 // The exception specification is needed because we are defining the
13608 // function.
13609 ResolveExceptionSpec(CurrentLocation,
13610 CopyAssignOperator->getType()->castAs<FunctionProtoType>());
13611
13612 // Add a context note for diagnostics produced after this point.
13613 Scope.addContextNote(CurrentLocation);
13614
13615 // C++11 [class.copy]p18:
13616 // The [definition of an implicitly declared copy assignment operator] is
13617 // deprecated if the class has a user-declared copy constructor or a
13618 // user-declared destructor.
13619 if (getLangOpts().CPlusPlus11 && CopyAssignOperator->isImplicit())
13620 diagnoseDeprecatedCopyOperation(*this, CopyAssignOperator);
13621
13622 // C++0x [class.copy]p30:
13623 // The implicitly-defined or explicitly-defaulted copy assignment operator
13624 // for a non-union class X performs memberwise copy assignment of its
13625 // subobjects. The direct base classes of X are assigned first, in the
13626 // order of their declaration in the base-specifier-list, and then the
13627 // immediate non-static data members of X are assigned, in the order in
13628 // which they were declared in the class definition.
13629
13630 // The statements that form the synthesized function body.
13631 SmallVector<Stmt*, 8> Statements;
13632
13633 // The parameter for the "other" object, which we are copying from.
13634 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0);
13635 Qualifiers OtherQuals = Other->getType().getQualifiers();
13636 QualType OtherRefType = Other->getType();
13637 if (const LValueReferenceType *OtherRef
13638 = OtherRefType->getAs<LValueReferenceType>()) {
13639 OtherRefType = OtherRef->getPointeeType();
13640 OtherQuals = OtherRefType.getQualifiers();
13641 }
13642
13643 // Our location for everything implicitly-generated.
13644 SourceLocation Loc = CopyAssignOperator->getEndLoc().isValid()
13645 ? CopyAssignOperator->getEndLoc()
13646 : CopyAssignOperator->getLocation();
13647
13648 // Builds a DeclRefExpr for the "other" object.
13649 RefBuilder OtherRef(Other, OtherRefType);
13650
13651 // Builds the "this" pointer.
13652 ThisBuilder This;
13653
13654 // Assign base classes.
13655 bool Invalid = false;
13656 for (auto &Base : ClassDecl->bases()) {
13657 // Form the assignment:
13658 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other));
13659 QualType BaseType = Base.getType().getUnqualifiedType();
13660 if (!BaseType->isRecordType()) {
13661 Invalid = true;
13662 continue;
13663 }
13664
13665 CXXCastPath BasePath;
13666 BasePath.push_back(&Base);
13667
13668 // Construct the "from" expression, which is an implicit cast to the
13669 // appropriately-qualified base type.
13670 CastBuilder From(OtherRef, Context.getQualifiedType(BaseType, OtherQuals),
13671 VK_LValue, BasePath);
13672
13673 // Dereference "this".
13674 DerefBuilder DerefThis(This);
13675 CastBuilder To(DerefThis,
13676 Context.getQualifiedType(
13677 BaseType, CopyAssignOperator->getMethodQualifiers()),
13678 VK_LValue, BasePath);
13679
13680 // Build the copy.
13681 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType,
13682 To, From,
13683 /*CopyingBaseSubobject=*/true,
13684 /*Copying=*/true);
13685 if (Copy.isInvalid()) {
13686 CopyAssignOperator->setInvalidDecl();
13687 return;
13688 }
13689
13690 // Success! Record the copy.
13691 Statements.push_back(Copy.getAs<Expr>());
13692 }
13693
13694 // Assign non-static members.
13695 for (auto *Field : ClassDecl->fields()) {
13696 // FIXME: We should form some kind of AST representation for the implied
13697 // memcpy in a union copy operation.
13698 if (Field->isUnnamedBitfield() || Field->getParent()->isUnion())
13699 continue;
13700
13701 if (Field->isInvalidDecl()) {
13702 Invalid = true;
13703 continue;
13704 }
13705
13706 // Check for members of reference type; we can't copy those.
13707 if (Field->getType()->isReferenceType()) {
13708 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
13709 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
13710 Diag(Field->getLocation(), diag::note_declared_at);
13711 Invalid = true;
13712 continue;
13713 }
13714
13715 // Check for members of const-qualified, non-class type.
13716 QualType BaseType = Context.getBaseElementType(Field->getType());
13717 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) {
13718 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
13719 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
13720 Diag(Field->getLocation(), diag::note_declared_at);
13721 Invalid = true;
13722 continue;
13723 }
13724
13725 // Suppress assigning zero-width bitfields.
13726 if (Field->isZeroLengthBitField(Context))
13727 continue;
13728
13729 QualType FieldType = Field->getType().getNonReferenceType();
13730 if (FieldType->isIncompleteArrayType()) {
13731 assert(ClassDecl->hasFlexibleArrayMember() &&
13732 "Incomplete array type is not valid");
13733 continue;
13734 }
13735
13736 // Build references to the field in the object we're copying from and to.
13737 CXXScopeSpec SS; // Intentionally empty
13738 LookupResult MemberLookup(*this, Field->getDeclName(), Loc,
13739 LookupMemberName);
13740 MemberLookup.addDecl(Field);
13741 MemberLookup.resolveKind();
13742
13743 MemberBuilder From(OtherRef, OtherRefType, /*IsArrow=*/false, MemberLookup);
13744
13745 MemberBuilder To(This, getCurrentThisType(), /*IsArrow=*/true, MemberLookup);
13746
13747 // Build the copy of this field.
13748 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType,
13749 To, From,
13750 /*CopyingBaseSubobject=*/false,
13751 /*Copying=*/true);
13752 if (Copy.isInvalid()) {
13753 CopyAssignOperator->setInvalidDecl();
13754 return;
13755 }
13756
13757 // Success! Record the copy.
13758 Statements.push_back(Copy.getAs<Stmt>());
13759 }
13760
13761 if (!Invalid) {
13762 // Add a "return *this;"
13763 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc));
13764
13765 StmtResult Return = BuildReturnStmt(Loc, ThisObj.get());
13766 if (Return.isInvalid())
13767 Invalid = true;
13768 else
13769 Statements.push_back(Return.getAs<Stmt>());
13770 }
13771
13772 if (Invalid) {
13773 CopyAssignOperator->setInvalidDecl();
13774 return;
13775 }
13776
13777 StmtResult Body;
13778 {
13779 CompoundScopeRAII CompoundScope(*this);
13780 Body = ActOnCompoundStmt(Loc, Loc, Statements,
13781 /*isStmtExpr=*/false);
13782 assert(!Body.isInvalid() && "Compound statement creation cannot fail");
13783 }
13784 CopyAssignOperator->setBody(Body.getAs<Stmt>());
13785 CopyAssignOperator->markUsed(Context);
13786
13787 if (ASTMutationListener *L = getASTMutationListener()) {
13788 L->CompletedImplicitDefinition(CopyAssignOperator);
13789 }
13790 }
13791
13792 CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) {
13793 assert(ClassDecl->needsImplicitMoveAssignment());
13794
13795 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment);
13796 if (DSM.isAlreadyBeingDeclared())
13797 return nullptr;
13798
13799 // Note: The following rules are largely analoguous to the move
13800 // constructor rules.
13801
13802 QualType ArgType = Context.getTypeDeclType(ClassDecl);
13803 LangAS AS = getDefaultCXXMethodAddrSpace();
13804 if (AS != LangAS::Default)
13805 ArgType = Context.getAddrSpaceQualType(ArgType, AS);
13806 QualType RetType = Context.getLValueReferenceType(ArgType);
13807 ArgType = Context.getRValueReferenceType(ArgType);
13808
13809 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
13810 CXXMoveAssignment,
13811 false);
13812
13813 // An implicitly-declared move assignment operator is an inline public
13814 // member of its class.
13815 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal);
13816 SourceLocation ClassLoc = ClassDecl->getLocation();
13817 DeclarationNameInfo NameInfo(Name, ClassLoc);
13818 CXXMethodDecl *MoveAssignment = CXXMethodDecl::Create(
13819 Context, ClassDecl, ClassLoc, NameInfo, QualType(),
13820 /*TInfo=*/nullptr, /*StorageClass=*/SC_None,
13821 /*isInline=*/true, Constexpr ? CSK_constexpr : CSK_unspecified,
13822 SourceLocation());
13823 MoveAssignment->setAccess(AS_public);
13824 MoveAssignment->setDefaulted();
13825 MoveAssignment->setImplicit();
13826
13827 if (getLangOpts().CUDA) {
13828 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXMoveAssignment,
13829 MoveAssignment,
13830 /* ConstRHS */ false,
13831 /* Diagnose */ false);
13832 }
13833
13834 // Build an exception specification pointing back at this member.
13835 FunctionProtoType::ExtProtoInfo EPI =
13836 getImplicitMethodEPI(*this, MoveAssignment);
13837 MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI));
13838
13839 // Add the parameter to the operator.
13840 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment,
13841 ClassLoc, ClassLoc,
13842 /*Id=*/nullptr, ArgType,
13843 /*TInfo=*/nullptr, SC_None,
13844 nullptr);
13845 MoveAssignment->setParams(FromParam);
13846
13847 MoveAssignment->setTrivial(
13848 ClassDecl->needsOverloadResolutionForMoveAssignment()
13849 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment)
13850 : ClassDecl->hasTrivialMoveAssignment());
13851
13852 // Note that we have added this copy-assignment operator.
13853 ++getASTContext().NumImplicitMoveAssignmentOperatorsDeclared;
13854
13855 Scope *S = getScopeForContext(ClassDecl);
13856 CheckImplicitSpecialMemberDeclaration(S, MoveAssignment);
13857
13858 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) {
13859 ClassDecl->setImplicitMoveAssignmentIsDeleted();
13860 SetDeclDeleted(MoveAssignment, ClassLoc);
13861 }
13862
13863 if (S)
13864 PushOnScopeChains(MoveAssignment, S, false);
13865 ClassDecl->addDecl(MoveAssignment);
13866
13867 return MoveAssignment;
13868 }
13869
13870 /// Check if we're implicitly defining a move assignment operator for a class
13871 /// with virtual bases. Such a move assignment might move-assign the virtual
13872 /// base multiple times.
13873 static void checkMoveAssignmentForRepeatedMove(Sema &S, CXXRecordDecl *Class,
13874 SourceLocation CurrentLocation) {
13875 assert(!Class->isDependentContext() && "should not define dependent move");
13876
13877 // Only a virtual base could get implicitly move-assigned multiple times.
13878 // Only a non-trivial move assignment can observe this. We only want to
13879 // diagnose if we implicitly define an assignment operator that assigns
13880 // two base classes, both of which move-assign the same virtual base.
13881 if (Class->getNumVBases() == 0 || Class->hasTrivialMoveAssignment() ||
13882 Class->getNumBases() < 2)
13883 return;
13884
13885 llvm::SmallVector<CXXBaseSpecifier *, 16> Worklist;
13886 typedef llvm::DenseMap<CXXRecordDecl*, CXXBaseSpecifier*> VBaseMap;
13887 VBaseMap VBases;
13888
13889 for (auto &BI : Class->bases()) {
13890 Worklist.push_back(&BI);
13891 while (!Worklist.empty()) {
13892 CXXBaseSpecifier *BaseSpec = Worklist.pop_back_val();
13893 CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl();
13894
13895 // If the base has no non-trivial move assignment operators,
13896 // we don't care about moves from it.
13897 if (!Base->hasNonTrivialMoveAssignment())
13898 continue;
13899
13900 // If there's nothing virtual here, skip it.
13901 if (!BaseSpec->isVirtual() && !Base->getNumVBases())
13902 continue;
13903
13904 // If we're not actually going to call a move assignment for this base,
13905 // or the selected move assignment is trivial, skip it.
13906 Sema::SpecialMemberOverloadResult SMOR =
13907 S.LookupSpecialMember(Base, Sema::CXXMoveAssignment,
13908 /*ConstArg*/false, /*VolatileArg*/false,
13909 /*RValueThis*/true, /*ConstThis*/false,
13910 /*VolatileThis*/false);
13911 if (!SMOR.getMethod() || SMOR.getMethod()->isTrivial() ||
13912 !SMOR.getMethod()->isMoveAssignmentOperator())
13913 continue;
13914
13915 if (BaseSpec->isVirtual()) {
13916 // We're going to move-assign this virtual base, and its move
13917 // assignment operator is not trivial. If this can happen for
13918 // multiple distinct direct bases of Class, diagnose it. (If it
13919 // only happens in one base, we'll diagnose it when synthesizing
13920 // that base class's move assignment operator.)
13921 CXXBaseSpecifier *&Existing =
13922 VBases.insert(std::make_pair(Base->getCanonicalDecl(), &BI))
13923 .first->second;
13924 if (Existing && Existing != &BI) {
13925 S.Diag(CurrentLocation, diag::warn_vbase_moved_multiple_times)
13926 << Class << Base;
13927 S.Diag(Existing->getBeginLoc(), diag::note_vbase_moved_here)
13928 << (Base->getCanonicalDecl() ==
13929 Existing->getType()->getAsCXXRecordDecl()->getCanonicalDecl())
13930 << Base << Existing->getType() << Existing->getSourceRange();
13931 S.Diag(BI.getBeginLoc(), diag::note_vbase_moved_here)
13932 << (Base->getCanonicalDecl() ==
13933 BI.getType()->getAsCXXRecordDecl()->getCanonicalDecl())
13934 << Base << BI.getType() << BaseSpec->getSourceRange();
13935
13936 // Only diagnose each vbase once.
13937 Existing = nullptr;
13938 }
13939 } else {
13940 // Only walk over bases that have defaulted move assignment operators.
13941 // We assume that any user-provided move assignment operator handles
13942 // the multiple-moves-of-vbase case itself somehow.
13943 if (!SMOR.getMethod()->isDefaulted())
13944 continue;
13945
13946 // We're going to move the base classes of Base. Add them to the list.
13947 for (auto &BI : Base->bases())
13948 Worklist.push_back(&BI);
13949 }
13950 }
13951 }
13952 }
13953
13954 void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation,
13955 CXXMethodDecl *MoveAssignOperator) {
13956 assert((MoveAssignOperator->isDefaulted() &&
13957 MoveAssignOperator->isOverloadedOperator() &&
13958 MoveAssignOperator->getOverloadedOperator() == OO_Equal &&
13959 !MoveAssignOperator->doesThisDeclarationHaveABody() &&
13960 !MoveAssignOperator->isDeleted()) &&
13961 "DefineImplicitMoveAssignment called for wrong function");
13962 if (MoveAssignOperator->willHaveBody() || MoveAssignOperator->isInvalidDecl())
13963 return;
13964
13965 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent();
13966 if (ClassDecl->isInvalidDecl()) {
13967 MoveAssignOperator->setInvalidDecl();
13968 return;
13969 }
13970
13971 // C++0x [class.copy]p28:
13972 // The implicitly-defined or move assignment operator for a non-union class
13973 // X performs memberwise move assignment of its subobjects. The direct base
13974 // classes of X are assigned first, in the order of their declaration in the
13975 // base-specifier-list, and then the immediate non-static data members of X
13976 // are assigned, in the order in which they were declared in the class
13977 // definition.
13978
13979 // Issue a warning if our implicit move assignment operator will move
13980 // from a virtual base more than once.
13981 checkMoveAssignmentForRepeatedMove(*this, ClassDecl, CurrentLocation);
13982
13983 SynthesizedFunctionScope Scope(*this, MoveAssignOperator);
13984
13985 // The exception specification is needed because we are defining the
13986 // function.
13987 ResolveExceptionSpec(CurrentLocation,
13988 MoveAssignOperator->getType()->castAs<FunctionProtoType>());
13989
13990 // Add a context note for diagnostics produced after this point.
13991 Scope.addContextNote(CurrentLocation);
13992
13993 // The statements that form the synthesized function body.
13994 SmallVector<Stmt*, 8> Statements;
13995
13996 // The parameter for the "other" object, which we are move from.
13997 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0);
13998 QualType OtherRefType =
13999 Other->getType()->castAs<RValueReferenceType>()->getPointeeType();
14000
14001 // Our location for everything implicitly-generated.
14002 SourceLocation Loc = MoveAssignOperator->getEndLoc().isValid()
14003 ? MoveAssignOperator->getEndLoc()
14004 : MoveAssignOperator->getLocation();
14005
14006 // Builds a reference to the "other" object.
14007 RefBuilder OtherRef(Other, OtherRefType);
14008 // Cast to rvalue.
14009 MoveCastBuilder MoveOther(OtherRef);
14010
14011 // Builds the "this" pointer.
14012 ThisBuilder This;
14013
14014 // Assign base classes.
14015 bool Invalid = false;
14016 for (auto &Base : ClassDecl->bases()) {
14017 // C++11 [class.copy]p28:
14018 // It is unspecified whether subobjects representing virtual base classes
14019 // are assigned more than once by the implicitly-defined copy assignment
14020 // operator.
14021 // FIXME: Do not assign to a vbase that will be assigned by some other base
14022 // class. For a move-assignment, this can result in the vbase being moved
14023 // multiple times.
14024
14025 // Form the assignment:
14026 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other));
14027 QualType BaseType = Base.getType().getUnqualifiedType();
14028 if (!BaseType->isRecordType()) {
14029 Invalid = true;
14030 continue;
14031 }
14032
14033 CXXCastPath BasePath;
14034 BasePath.push_back(&Base);
14035
14036 // Construct the "from" expression, which is an implicit cast to the
14037 // appropriately-qualified base type.
14038 CastBuilder From(OtherRef, BaseType, VK_XValue, BasePath);
14039
14040 // Dereference "this".
14041 DerefBuilder DerefThis(This);
14042
14043 // Implicitly cast "this" to the appropriately-qualified base type.
14044 CastBuilder To(DerefThis,
14045 Context.getQualifiedType(
14046 BaseType, MoveAssignOperator->getMethodQualifiers()),
14047 VK_LValue, BasePath);
14048
14049 // Build the move.
14050 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType,
14051 To, From,
14052 /*CopyingBaseSubobject=*/true,
14053 /*Copying=*/false);
14054 if (Move.isInvalid()) {
14055 MoveAssignOperator->setInvalidDecl();
14056 return;
14057 }
14058
14059 // Success! Record the move.
14060 Statements.push_back(Move.getAs<Expr>());
14061 }
14062
14063 // Assign non-static members.
14064 for (auto *Field : ClassDecl->fields()) {
14065 // FIXME: We should form some kind of AST representation for the implied
14066 // memcpy in a union copy operation.
14067 if (Field->isUnnamedBitfield() || Field->getParent()->isUnion())
14068 continue;
14069
14070 if (Field->isInvalidDecl()) {
14071 Invalid = true;
14072 continue;
14073 }
14074
14075 // Check for members of reference type; we can't move those.
14076 if (Field->getType()->isReferenceType()) {
14077 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
14078 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
14079 Diag(Field->getLocation(), diag::note_declared_at);
14080 Invalid = true;
14081 continue;
14082 }
14083
14084 // Check for members of const-qualified, non-class type.
14085 QualType BaseType = Context.getBaseElementType(Field->getType());
14086 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) {
14087 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
14088 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
14089 Diag(Field->getLocation(), diag::note_declared_at);
14090 Invalid = true;
14091 continue;
14092 }
14093
14094 // Suppress assigning zero-width bitfields.
14095 if (Field->isZeroLengthBitField(Context))
14096 continue;
14097
14098 QualType FieldType = Field->getType().getNonReferenceType();
14099 if (FieldType->isIncompleteArrayType()) {
14100 assert(ClassDecl->hasFlexibleArrayMember() &&
14101 "Incomplete array type is not valid");
14102 continue;
14103 }
14104
14105 // Build references to the field in the object we're copying from and to.
14106 LookupResult MemberLookup(*this, Field->getDeclName(), Loc,
14107 LookupMemberName);
14108 MemberLookup.addDecl(Field);
14109 MemberLookup.resolveKind();
14110 MemberBuilder From(MoveOther, OtherRefType,
14111 /*IsArrow=*/false, MemberLookup);
14112 MemberBuilder To(This, getCurrentThisType(),
14113 /*IsArrow=*/true, MemberLookup);
14114
14115 assert(!From.build(*this, Loc)->isLValue() && // could be xvalue or prvalue
14116 "Member reference with rvalue base must be rvalue except for reference "
14117 "members, which aren't allowed for move assignment.");
14118
14119 // Build the move of this field.
14120 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType,
14121 To, From,
14122 /*CopyingBaseSubobject=*/false,
14123 /*Copying=*/false);
14124 if (Move.isInvalid()) {
14125 MoveAssignOperator->setInvalidDecl();
14126 return;
14127 }
14128
14129 // Success! Record the copy.
14130 Statements.push_back(Move.getAs<Stmt>());
14131 }
14132
14133 if (!Invalid) {
14134 // Add a "return *this;"
14135 ExprResult ThisObj =
14136 CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc));
14137
14138 StmtResult Return = BuildReturnStmt(Loc, ThisObj.get());
14139 if (Return.isInvalid())
14140 Invalid = true;
14141 else
14142 Statements.push_back(Return.getAs<Stmt>());
14143 }
14144
14145 if (Invalid) {
14146 MoveAssignOperator->setInvalidDecl();
14147 return;
14148 }
14149
14150 StmtResult Body;
14151 {
14152 CompoundScopeRAII CompoundScope(*this);
14153 Body = ActOnCompoundStmt(Loc, Loc, Statements,
14154 /*isStmtExpr=*/false);
14155 assert(!Body.isInvalid() && "Compound statement creation cannot fail");
14156 }
14157 MoveAssignOperator->setBody(Body.getAs<Stmt>());
14158 MoveAssignOperator->markUsed(Context);
14159
14160 if (ASTMutationListener *L = getASTMutationListener()) {
14161 L->CompletedImplicitDefinition(MoveAssignOperator);
14162 }
14163 }
14164
14165 CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor(
14166 CXXRecordDecl *ClassDecl) {
14167 // C++ [class.copy]p4:
14168 // If the class definition does not explicitly declare a copy
14169 // constructor, one is declared implicitly.
14170 assert(ClassDecl->needsImplicitCopyConstructor());
14171
14172 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor);
14173 if (DSM.isAlreadyBeingDeclared())
14174 return nullptr;
14175
14176 QualType ClassType = Context.getTypeDeclType(ClassDecl);
14177 QualType ArgType = ClassType;
14178 bool Const = ClassDecl->implicitCopyConstructorHasConstParam();
14179 if (Const)
14180 ArgType = ArgType.withConst();
14181
14182 LangAS AS = getDefaultCXXMethodAddrSpace();
14183 if (AS != LangAS::Default)
14184 ArgType = Context.getAddrSpaceQualType(ArgType, AS);
14185
14186 ArgType = Context.getLValueReferenceType(ArgType);
14187
14188 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
14189 CXXCopyConstructor,
14190 Const);
14191
14192 DeclarationName Name
14193 = Context.DeclarationNames.getCXXConstructorName(
14194 Context.getCanonicalType(ClassType));
14195 SourceLocation ClassLoc = ClassDecl->getLocation();
14196 DeclarationNameInfo NameInfo(Name, ClassLoc);
14197
14198 // An implicitly-declared copy constructor is an inline public
14199 // member of its class.
14200 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create(
14201 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/nullptr,
14202 ExplicitSpecifier(),
14203 /*isInline=*/true,
14204 /*isImplicitlyDeclared=*/true,
14205 Constexpr ? CSK_constexpr : CSK_unspecified);
14206 CopyConstructor->setAccess(AS_public);
14207 CopyConstructor->setDefaulted();
14208
14209 if (getLangOpts().CUDA) {
14210 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXCopyConstructor,
14211 CopyConstructor,
14212 /* ConstRHS */ Const,
14213 /* Diagnose */ false);
14214 }
14215
14216 setupImplicitSpecialMemberType(CopyConstructor, Context.VoidTy, ArgType);
14217
14218 // Add the parameter to the constructor.
14219 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor,
14220 ClassLoc, ClassLoc,
14221 /*IdentifierInfo=*/nullptr,
14222 ArgType, /*TInfo=*/nullptr,
14223 SC_None, nullptr);
14224 CopyConstructor->setParams(FromParam);
14225
14226 CopyConstructor->setTrivial(
14227 ClassDecl->needsOverloadResolutionForCopyConstructor()
14228 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor)
14229 : ClassDecl->hasTrivialCopyConstructor());
14230
14231 CopyConstructor->setTrivialForCall(
14232 ClassDecl->hasAttr<TrivialABIAttr>() ||
14233 (ClassDecl->needsOverloadResolutionForCopyConstructor()
14234 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor,
14235 TAH_ConsiderTrivialABI)
14236 : ClassDecl->hasTrivialCopyConstructorForCall()));
14237
14238 // Note that we have declared this constructor.
14239 ++getASTContext().NumImplicitCopyConstructorsDeclared;
14240
14241 Scope *S = getScopeForContext(ClassDecl);
14242 CheckImplicitSpecialMemberDeclaration(S, CopyConstructor);
14243
14244 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) {
14245 ClassDecl->setImplicitCopyConstructorIsDeleted();
14246 SetDeclDeleted(CopyConstructor, ClassLoc);
14247 }
14248
14249 if (S)
14250 PushOnScopeChains(CopyConstructor, S, false);
14251 ClassDecl->addDecl(CopyConstructor);
14252
14253 return CopyConstructor;
14254 }
14255
14256 void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
14257 CXXConstructorDecl *CopyConstructor) {
14258 assert((CopyConstructor->isDefaulted() &&
14259 CopyConstructor->isCopyConstructor() &&
14260 !CopyConstructor->doesThisDeclarationHaveABody() &&
14261 !CopyConstructor->isDeleted()) &&
14262 "DefineImplicitCopyConstructor - call it for implicit copy ctor");
14263 if (CopyConstructor->willHaveBody() || CopyConstructor->isInvalidDecl())
14264 return;
14265
14266 CXXRecordDecl *ClassDecl = CopyConstructor->getParent();
14267 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor");
14268
14269 SynthesizedFunctionScope Scope(*this, CopyConstructor);
14270
14271 // The exception specification is needed because we are defining the
14272 // function.
14273 ResolveExceptionSpec(CurrentLocation,
14274 CopyConstructor->getType()->castAs<FunctionProtoType>());
14275 MarkVTableUsed(CurrentLocation, ClassDecl);
14276
14277 // Add a context note for diagnostics produced after this point.
14278 Scope.addContextNote(CurrentLocation);
14279
14280 // C++11 [class.copy]p7:
14281 // The [definition of an implicitly declared copy constructor] is
14282 // deprecated if the class has a user-declared copy assignment operator
14283 // or a user-declared destructor.
14284 if (getLangOpts().CPlusPlus11 && CopyConstructor->isImplicit())
14285 diagnoseDeprecatedCopyOperation(*this, CopyConstructor);
14286
14287 if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false)) {
14288 CopyConstructor->setInvalidDecl();
14289 } else {
14290 SourceLocation Loc = CopyConstructor->getEndLoc().isValid()
14291 ? CopyConstructor->getEndLoc()
14292 : CopyConstructor->getLocation();
14293 Sema::CompoundScopeRAII CompoundScope(*this);
14294 CopyConstructor->setBody(
14295 ActOnCompoundStmt(Loc, Loc, None, /*isStmtExpr=*/false).getAs<Stmt>());
14296 CopyConstructor->markUsed(Context);
14297 }
14298
14299 if (ASTMutationListener *L = getASTMutationListener()) {
14300 L->CompletedImplicitDefinition(CopyConstructor);
14301 }
14302 }
14303
14304 CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor(
14305 CXXRecordDecl *ClassDecl) {
14306 assert(ClassDecl->needsImplicitMoveConstructor());
14307
14308 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor);
14309 if (DSM.isAlreadyBeingDeclared())
14310 return nullptr;
14311
14312 QualType ClassType = Context.getTypeDeclType(ClassDecl);
14313
14314 QualType ArgType = ClassType;
14315 LangAS AS = getDefaultCXXMethodAddrSpace();
14316 if (AS != LangAS::Default)
14317 ArgType = Context.getAddrSpaceQualType(ClassType, AS);
14318 ArgType = Context.getRValueReferenceType(ArgType);
14319
14320 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
14321 CXXMoveConstructor,
14322 false);
14323
14324 DeclarationName Name
14325 = Context.DeclarationNames.getCXXConstructorName(
14326 Context.getCanonicalType(ClassType));
14327 SourceLocation ClassLoc = ClassDecl->getLocation();
14328 DeclarationNameInfo NameInfo(Name, ClassLoc);
14329
14330 // C++11 [class.copy]p11:
14331 // An implicitly-declared copy/move constructor is an inline public
14332 // member of its class.
14333 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create(
14334 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/nullptr,
14335 ExplicitSpecifier(),
14336 /*isInline=*/true,
14337 /*isImplicitlyDeclared=*/true,
14338 Constexpr ? CSK_constexpr : CSK_unspecified);
14339 MoveConstructor->setAccess(AS_public);
14340 MoveConstructor->setDefaulted();
14341
14342 if (getLangOpts().CUDA) {
14343 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXMoveConstructor,
14344 MoveConstructor,
14345 /* ConstRHS */ false,
14346 /* Diagnose */ false);
14347 }
14348
14349 setupImplicitSpecialMemberType(MoveConstructor, Context.VoidTy, ArgType);
14350
14351 // Add the parameter to the constructor.
14352 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor,
14353 ClassLoc, ClassLoc,
14354 /*IdentifierInfo=*/nullptr,
14355 ArgType, /*TInfo=*/nullptr,
14356 SC_None, nullptr);
14357 MoveConstructor->setParams(FromParam);
14358
14359 MoveConstructor->setTrivial(
14360 ClassDecl->needsOverloadResolutionForMoveConstructor()
14361 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor)
14362 : ClassDecl->hasTrivialMoveConstructor());
14363
14364 MoveConstructor->setTrivialForCall(
14365 ClassDecl->hasAttr<TrivialABIAttr>() ||
14366 (ClassDecl->needsOverloadResolutionForMoveConstructor()
14367 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor,
14368 TAH_ConsiderTrivialABI)
14369 : ClassDecl->hasTrivialMoveConstructorForCall()));
14370
14371 // Note that we have declared this constructor.
14372 ++getASTContext().NumImplicitMoveConstructorsDeclared;
14373
14374 Scope *S = getScopeForContext(ClassDecl);
14375 CheckImplicitSpecialMemberDeclaration(S, MoveConstructor);
14376
14377 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) {
14378 ClassDecl->setImplicitMoveConstructorIsDeleted();
14379 SetDeclDeleted(MoveConstructor, ClassLoc);
14380 }
14381
14382 if (S)
14383 PushOnScopeChains(MoveConstructor, S, false);
14384 ClassDecl->addDecl(MoveConstructor);
14385
14386 return MoveConstructor;
14387 }
14388
14389 void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation,
14390 CXXConstructorDecl *MoveConstructor) {
14391 assert((MoveConstructor->isDefaulted() &&
14392 MoveConstructor->isMoveConstructor() &&
14393 !MoveConstructor->doesThisDeclarationHaveABody() &&
14394 !MoveConstructor->isDeleted()) &&
14395 "DefineImplicitMoveConstructor - call it for implicit move ctor");
14396 if (MoveConstructor->willHaveBody() || MoveConstructor->isInvalidDecl())
14397 return;
14398
14399 CXXRecordDecl *ClassDecl = MoveConstructor->getParent();
14400 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor");
14401
14402 SynthesizedFunctionScope Scope(*this, MoveConstructor);
14403
14404 // The exception specification is needed because we are defining the
14405 // function.
14406 ResolveExceptionSpec(CurrentLocation,
14407 MoveConstructor->getType()->castAs<FunctionProtoType>());
14408 MarkVTableUsed(CurrentLocation, ClassDecl);
14409
14410 // Add a context note for diagnostics produced after this point.
14411 Scope.addContextNote(CurrentLocation);
14412
14413 if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false)) {
14414 MoveConstructor->setInvalidDecl();
14415 } else {
14416 SourceLocation Loc = MoveConstructor->getEndLoc().isValid()
14417 ? MoveConstructor->getEndLoc()
14418 : MoveConstructor->getLocation();
14419 Sema::CompoundScopeRAII CompoundScope(*this);
14420 MoveConstructor->setBody(ActOnCompoundStmt(
14421 Loc, Loc, None, /*isStmtExpr=*/ false).getAs<Stmt>());
14422 MoveConstructor->markUsed(Context);
14423 }
14424
14425 if (ASTMutationListener *L = getASTMutationListener()) {
14426 L->CompletedImplicitDefinition(MoveConstructor);
14427 }
14428 }
14429
14430 bool Sema::isImplicitlyDeleted(FunctionDecl *FD) {
14431 return FD->isDeleted() && FD->isDefaulted() && isa<CXXMethodDecl>(FD);
14432 }
14433
14434 void Sema::DefineImplicitLambdaToFunctionPointerConversion(
14435 SourceLocation CurrentLocation,
14436 CXXConversionDecl *Conv) {
14437 SynthesizedFunctionScope Scope(*this, Conv);
14438 assert(!Conv->getReturnType()->isUndeducedType());
14439
14440 CXXRecordDecl *Lambda = Conv->getParent();
14441 FunctionDecl *CallOp = Lambda->getLambdaCallOperator();
14442 FunctionDecl *Invoker = Lambda->getLambdaStaticInvoker();
14443
14444 if (auto *TemplateArgs = Conv->getTemplateSpecializationArgs()) {
14445 CallOp = InstantiateFunctionDeclaration(
14446 CallOp->getDescribedFunctionTemplate(), TemplateArgs, CurrentLocation);
14447 if (!CallOp)
14448 return;
14449
14450 Invoker = InstantiateFunctionDeclaration(
14451 Invoker->getDescribedFunctionTemplate(), TemplateArgs, CurrentLocation);
14452 if (!Invoker)
14453 return;
14454 }
14455
14456 if (CallOp->isInvalidDecl())
14457 return;
14458
14459 // Mark the call operator referenced (and add to pending instantiations
14460 // if necessary).
14461 // For both the conversion and static-invoker template specializations
14462 // we construct their body's in this function, so no need to add them
14463 // to the PendingInstantiations.
14464 MarkFunctionReferenced(CurrentLocation, CallOp);
14465
14466 // Fill in the __invoke function with a dummy implementation. IR generation
14467 // will fill in the actual details. Update its type in case it contained
14468 // an 'auto'.
14469 Invoker->markUsed(Context);
14470 Invoker->setReferenced();
14471 Invoker->setType(Conv->getReturnType()->getPointeeType());
14472 Invoker->setBody(new (Context) CompoundStmt(Conv->getLocation()));
14473
14474 // Construct the body of the conversion function { return __invoke; }.
14475 Expr *FunctionRef = BuildDeclRefExpr(Invoker, Invoker->getType(),
14476 VK_LValue, Conv->getLocation());
14477 assert(FunctionRef && "Can't refer to __invoke function?");
14478 Stmt *Return = BuildReturnStmt(Conv->getLocation(), FunctionRef).get();
14479 Conv->setBody(CompoundStmt::Create(Context, Return, Conv->getLocation(),
14480 Conv->getLocation()));
14481 Conv->markUsed(Context);
14482 Conv->setReferenced();
14483
14484 if (ASTMutationListener *L = getASTMutationListener()) {
14485 L->CompletedImplicitDefinition(Conv);
14486 L->CompletedImplicitDefinition(Invoker);
14487 }
14488 }
14489
14490
14491
14492 void Sema::DefineImplicitLambdaToBlockPointerConversion(
14493 SourceLocation CurrentLocation,
14494 CXXConversionDecl *Conv)
14495 {
14496 assert(!Conv->getParent()->isGenericLambda());
14497
14498 SynthesizedFunctionScope Scope(*this, Conv);
14499
14500 // Copy-initialize the lambda object as needed to capture it.
14501 Expr *This = ActOnCXXThis(CurrentLocation).get();
14502 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).get();
14503
14504 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation,
14505 Conv->getLocation(),
14506 Conv, DerefThis);
14507
14508 // If we're not under ARC, make sure we still get the _Block_copy/autorelease
14509 // behavior. Note that only the general conversion function does this
14510 // (since it's unusable otherwise); in the case where we inline the
14511 // block literal, it has block literal lifetime semantics.
14512 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount)
14513 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(),
14514 CK_CopyAndAutoreleaseBlockObject,
14515 BuildBlock.get(), nullptr, VK_RValue);
14516
14517 if (BuildBlock.isInvalid()) {
14518 Diag(CurrentLocation, diag::note_lambda_to_block_conv);
14519 Conv->setInvalidDecl();
14520 return;
14521 }
14522
14523 // Create the return statement that returns the block from the conversion
14524 // function.
14525 StmtResult Return = BuildReturnStmt(Conv->getLocation(), BuildBlock.get());
14526 if (Return.isInvalid()) {
14527 Diag(CurrentLocation, diag::note_lambda_to_block_conv);
14528 Conv->setInvalidDecl();
14529 return;
14530 }
14531
14532 // Set the body of the conversion function.
14533 Stmt *ReturnS = Return.get();
14534 Conv->setBody(CompoundStmt::Create(Context, ReturnS, Conv->getLocation(),
14535 Conv->getLocation()));
14536 Conv->markUsed(Context);
14537
14538 // We're done; notify the mutation listener, if any.
14539 if (ASTMutationListener *L = getASTMutationListener()) {
14540 L->CompletedImplicitDefinition(Conv);
14541 }
14542 }
14543
14544 /// Determine whether the given list arguments contains exactly one
14545 /// "real" (non-default) argument.
14546 static bool hasOneRealArgument(MultiExprArg Args) {
14547 switch (Args.size()) {
14548 case 0:
14549 return false;
14550
14551 default:
14552 if (!Args[1]->isDefaultArgument())
14553 return false;
14554
14555 LLVM_FALLTHROUGH;
14556 case 1:
14557 return !Args[0]->isDefaultArgument();
14558 }
14559
14560 return false;
14561 }
14562
14563 ExprResult
14564 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
14565 NamedDecl *FoundDecl,
14566 CXXConstructorDecl *Constructor,
14567 MultiExprArg ExprArgs,
14568 bool HadMultipleCandidates,
14569 bool IsListInitialization,
14570 bool IsStdInitListInitialization,
14571 bool RequiresZeroInit,
14572 unsigned ConstructKind,
14573 SourceRange ParenRange) {
14574 bool Elidable = false;
14575
14576 // C++0x [class.copy]p34:
14577 // When certain criteria are met, an implementation is allowed to
14578 // omit the copy/move construction of a class object, even if the
14579 // copy/move constructor and/or destructor for the object have
14580 // side effects. [...]
14581 // - when a temporary class object that has not been bound to a
14582 // reference (12.2) would be copied/moved to a class object
14583 // with the same cv-unqualified type, the copy/move operation
14584 // can be omitted by constructing the temporary object
14585 // directly into the target of the omitted copy/move
14586 if (ConstructKind == CXXConstructExpr::CK_Complete && Constructor &&
14587 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) {
14588 Expr *SubExpr = ExprArgs[0];
14589 Elidable = SubExpr->isTemporaryObject(
14590 Context, cast<CXXRecordDecl>(FoundDecl->getDeclContext()));
14591 }
14592
14593 return BuildCXXConstructExpr(ConstructLoc, DeclInitType,
14594 FoundDecl, Constructor,
14595 Elidable, ExprArgs, HadMultipleCandidates,
14596 IsListInitialization,
14597 IsStdInitListInitialization, RequiresZeroInit,
14598 ConstructKind, ParenRange);
14599 }
14600
14601 ExprResult
14602 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
14603 NamedDecl *FoundDecl,
14604 CXXConstructorDecl *Constructor,
14605 bool Elidable,
14606 MultiExprArg ExprArgs,
14607 bool HadMultipleCandidates,
14608 bool IsListInitialization,
14609 bool IsStdInitListInitialization,
14610 bool RequiresZeroInit,
14611 unsigned ConstructKind,
14612 SourceRange ParenRange) {
14613 if (auto *Shadow = dyn_cast<ConstructorUsingShadowDecl>(FoundDecl)) {
14614 Constructor = findInheritingConstructor(ConstructLoc, Constructor, Shadow);
14615 if (DiagnoseUseOfDecl(Constructor, ConstructLoc))
14616 return ExprError();
14617 }
14618
14619 return BuildCXXConstructExpr(
14620 ConstructLoc, DeclInitType, Constructor, Elidable, ExprArgs,
14621 HadMultipleCandidates, IsListInitialization, IsStdInitListInitialization,
14622 RequiresZeroInit, ConstructKind, ParenRange);
14623 }
14624
14625 /// BuildCXXConstructExpr - Creates a complete call to a constructor,
14626 /// including handling of its default argument expressions.
14627 ExprResult
14628 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
14629 CXXConstructorDecl *Constructor,
14630 bool Elidable,
14631 MultiExprArg ExprArgs,
14632 bool HadMultipleCandidates,
14633 bool IsListInitialization,
14634 bool IsStdInitListInitialization,
14635 bool RequiresZeroInit,
14636 unsigned ConstructKind,
14637 SourceRange ParenRange) {
14638 assert(declaresSameEntity(
14639 Constructor->getParent(),
14640 DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) &&
14641 "given constructor for wrong type");
14642 MarkFunctionReferenced(ConstructLoc, Constructor);
14643 if (getLangOpts().CUDA && !CheckCUDACall(ConstructLoc, Constructor))
14644 return ExprError();
14645
14646 return CXXConstructExpr::Create(
14647 Context, DeclInitType, ConstructLoc, Constructor, Elidable,
14648 ExprArgs, HadMultipleCandidates, IsListInitialization,
14649 IsStdInitListInitialization, RequiresZeroInit,
14650 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind),
14651 ParenRange);
14652 }
14653
14654 ExprResult Sema::BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field) {
14655 assert(Field->hasInClassInitializer());
14656
14657 // If we already have the in-class initializer nothing needs to be done.
14658 if (Field->getInClassInitializer())
14659 return CXXDefaultInitExpr::Create(Context, Loc, Field, CurContext);
14660
14661 // If we might have already tried and failed to instantiate, don't try again.
14662 if (Field->isInvalidDecl())
14663 return ExprError();
14664
14665 // Maybe we haven't instantiated the in-class initializer. Go check the
14666 // pattern FieldDecl to see if it has one.
14667 CXXRecordDecl *ParentRD = cast<CXXRecordDecl>(Field->getParent());
14668
14669 if (isTemplateInstantiation(ParentRD->getTemplateSpecializationKind())) {
14670 CXXRecordDecl *ClassPattern = ParentRD->getTemplateInstantiationPattern();
14671 DeclContext::lookup_result Lookup =
14672 ClassPattern->lookup(Field->getDeclName());
14673
14674 // Lookup can return at most two results: the pattern for the field, or the
14675 // injected class name of the parent record. No other member can have the
14676 // same name as the field.
14677 // In modules mode, lookup can return multiple results (coming from
14678 // different modules).
14679 assert((getLangOpts().Modules || (!Lookup.empty() && Lookup.size() <= 2)) &&
14680 "more than two lookup results for field name");
14681 FieldDecl *Pattern = dyn_cast<FieldDecl>(Lookup[0]);
14682 if (!Pattern) {
14683 assert(isa<CXXRecordDecl>(Lookup[0]) &&
14684 "cannot have other non-field member with same name");
14685 for (auto L : Lookup)
14686 if (isa<FieldDecl>(L)) {
14687 Pattern = cast<FieldDecl>(L);
14688 break;
14689 }
14690 assert(Pattern && "We must have set the Pattern!");
14691 }
14692
14693 if (!Pattern->hasInClassInitializer() ||
14694 InstantiateInClassInitializer(Loc, Field, Pattern,
14695 getTemplateInstantiationArgs(Field))) {
14696 // Don't diagnose this again.
14697 Field->setInvalidDecl();
14698 return ExprError();
14699 }
14700 return CXXDefaultInitExpr::Create(Context, Loc, Field, CurContext);
14701 }
14702
14703 // DR1351:
14704 // If the brace-or-equal-initializer of a non-static data member
14705 // invokes a defaulted default constructor of its class or of an
14706 // enclosing class in a potentially evaluated subexpression, the
14707 // program is ill-formed.
14708 //
14709 // This resolution is unworkable: the exception specification of the
14710 // default constructor can be needed in an unevaluated context, in
14711 // particular, in the operand of a noexcept-expression, and we can be
14712 // unable to compute an exception specification for an enclosed class.
14713 //
14714 // Any attempt to resolve the exception specification of a defaulted default
14715 // constructor before the initializer is lexically complete will ultimately
14716 // come here at which point we can diagnose it.
14717 RecordDecl *OutermostClass = ParentRD->getOuterLexicalRecordContext();
14718 Diag(Loc, diag::err_in_class_initializer_not_yet_parsed)
14719 << OutermostClass << Field;
14720 Diag(Field->getEndLoc(), diag::note_in_class_initializer_not_yet_parsed);
14721 // Recover by marking the field invalid, unless we're in a SFINAE context.
14722 if (!isSFINAEContext())
14723 Field->setInvalidDecl();
14724 return ExprError();
14725 }
14726
14727 void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) {
14728 if (VD->isInvalidDecl()) return;
14729
14730 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl());
14731 if (ClassDecl->isInvalidDecl()) return;
14732 if (ClassDecl->hasIrrelevantDestructor()) return;
14733 if (ClassDecl->isDependentContext()) return;
14734
14735 if (VD->isNoDestroy(getASTContext()))
14736 return;
14737
14738 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl);
14739
14740 // If this is an array, we'll require the destructor during initialization, so
14741 // we can skip over this. We still want to emit exit-time destructor warnings
14742 // though.
14743 if (!VD->getType()->isArrayType()) {
14744 MarkFunctionReferenced(VD->getLocation(), Destructor);
14745 CheckDestructorAccess(VD->getLocation(), Destructor,
14746 PDiag(diag::err_access_dtor_var)
14747 << VD->getDeclName() << VD->getType());
14748 DiagnoseUseOfDecl(Destructor, VD->getLocation());
14749 }
14750
14751 if (Destructor->isTrivial()) return;
14752
14753 // If the destructor is constexpr, check whether the variable has constant
14754 // destruction now.
14755 if (Destructor->isConstexpr() && VD->getInit() &&
14756 !VD->getInit()->isValueDependent() && VD->evaluateValue()) {
14757 SmallVector<PartialDiagnosticAt, 8> Notes;
14758 if (!VD->evaluateDestruction(Notes) && VD->isConstexpr()) {
14759 Diag(VD->getLocation(),
14760 diag::err_constexpr_var_requires_const_destruction) << VD;
14761 for (unsigned I = 0, N = Notes.size(); I != N; ++I)
14762 Diag(Notes[I].first, Notes[I].second);
14763 }
14764 }
14765
14766 if (!VD->hasGlobalStorage()) return;
14767
14768 // Emit warning for non-trivial dtor in global scope (a real global,
14769 // class-static, function-static).
14770 Diag(VD->getLocation(), diag::warn_exit_time_destructor);
14771
14772 // TODO: this should be re-enabled for static locals by !CXAAtExit
14773 if (!VD->isStaticLocal())
14774 Diag(VD->getLocation(), diag::warn_global_destructor);
14775 }
14776
14777 /// Given a constructor and the set of arguments provided for the
14778 /// constructor, convert the arguments and add any required default arguments
14779 /// to form a proper call to this constructor.
14780 ///
14781 /// \returns true if an error occurred, false otherwise.
14782 bool
14783 Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor,
14784 MultiExprArg ArgsPtr,
14785 SourceLocation Loc,
14786 SmallVectorImpl<Expr*> &ConvertedArgs,
14787 bool AllowExplicit,
14788 bool IsListInitialization) {
14789 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall.
14790 unsigned NumArgs = ArgsPtr.size();
14791 Expr **Args = ArgsPtr.data();
14792
14793 const auto *Proto = Constructor->getType()->castAs<FunctionProtoType>();
14794 unsigned NumParams = Proto->getNumParams();
14795
14796 // If too few arguments are available, we'll fill in the rest with defaults.
14797 if (NumArgs < NumParams)
14798 ConvertedArgs.reserve(NumParams);
14799 else
14800 ConvertedArgs.reserve(NumArgs);
14801
14802 VariadicCallType CallType =
14803 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply;
14804 SmallVector<Expr *, 8> AllArgs;
14805 bool Invalid = GatherArgumentsForCall(Loc, Constructor,
14806 Proto, 0,
14807 llvm::makeArrayRef(Args, NumArgs),
14808 AllArgs,
14809 CallType, AllowExplicit,
14810 IsListInitialization);
14811 ConvertedArgs.append(AllArgs.begin(), AllArgs.end());
14812
14813 DiagnoseSentinelCalls(Constructor, Loc, AllArgs);
14814
14815 CheckConstructorCall(Constructor,
14816 llvm::makeArrayRef(AllArgs.data(), AllArgs.size()),
14817 Proto, Loc);
14818
14819 return Invalid;
14820 }
14821
14822 static inline bool
14823 CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef,
14824 const FunctionDecl *FnDecl) {
14825 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext();
14826 if (isa<NamespaceDecl>(DC)) {
14827 return SemaRef.Diag(FnDecl->getLocation(),
14828 diag::err_operator_new_delete_declared_in_namespace)
14829 << FnDecl->getDeclName();
14830 }
14831
14832 if (isa<TranslationUnitDecl>(DC) &&
14833 FnDecl->getStorageClass() == SC_Static) {
14834 return SemaRef.Diag(FnDecl->getLocation(),
14835 diag::err_operator_new_delete_declared_static)
14836 << FnDecl->getDeclName();
14837 }
14838
14839 return false;
14840 }
14841
14842 static QualType
14843 RemoveAddressSpaceFromPtr(Sema &SemaRef, const PointerType *PtrTy) {
14844 QualType QTy = PtrTy->getPointeeType();
14845 QTy = SemaRef.Context.removeAddrSpaceQualType(QTy);
14846 return SemaRef.Context.getPointerType(QTy);
14847 }
14848
14849 static inline bool
14850 CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl,
14851 CanQualType ExpectedResultType,
14852 CanQualType ExpectedFirstParamType,
14853 unsigned DependentParamTypeDiag,
14854 unsigned InvalidParamTypeDiag) {
14855 QualType ResultType =
14856 FnDecl->getType()->castAs<FunctionType>()->getReturnType();
14857
14858 // Check that the result type is not dependent.
14859 if (ResultType->isDependentType())
14860 return SemaRef.Diag(FnDecl->getLocation(),
14861 diag::err_operator_new_delete_dependent_result_type)
14862 << FnDecl->getDeclName() << ExpectedResultType;
14863
14864 // The operator is valid on any address space for OpenCL.
14865 if (SemaRef.getLangOpts().OpenCLCPlusPlus) {
14866 if (auto *PtrTy = ResultType->getAs<PointerType>()) {
14867 ResultType = RemoveAddressSpaceFromPtr(SemaRef, PtrTy);
14868 }
14869 }
14870
14871 // Check that the result type is what we expect.
14872 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType)
14873 return SemaRef.Diag(FnDecl->getLocation(),
14874 diag::err_operator_new_delete_invalid_result_type)
14875 << FnDecl->getDeclName() << ExpectedResultType;
14876
14877 // A function template must have at least 2 parameters.
14878 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2)
14879 return SemaRef.Diag(FnDecl->getLocation(),
14880 diag::err_operator_new_delete_template_too_few_parameters)
14881 << FnDecl->getDeclName();
14882
14883 // The function decl must have at least 1 parameter.
14884 if (FnDecl->getNumParams() == 0)
14885 return SemaRef.Diag(FnDecl->getLocation(),
14886 diag::err_operator_new_delete_too_few_parameters)
14887 << FnDecl->getDeclName();
14888
14889 // Check the first parameter type is not dependent.
14890 QualType FirstParamType = FnDecl->getParamDecl(0)->getType();
14891 if (FirstParamType->isDependentType())
14892 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag)
14893 << FnDecl->getDeclName() << ExpectedFirstParamType;
14894
14895 // Check that the first parameter type is what we expect.
14896 if (SemaRef.getLangOpts().OpenCLCPlusPlus) {
14897 // The operator is valid on any address space for OpenCL.
14898 if (auto *PtrTy =
14899 FnDecl->getParamDecl(0)->getType()->getAs<PointerType>()) {
14900 FirstParamType = RemoveAddressSpaceFromPtr(SemaRef, PtrTy);
14901 }
14902 }
14903 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() !=
14904 ExpectedFirstParamType)
14905 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag)
14906 << FnDecl->getDeclName() << ExpectedFirstParamType;
14907
14908 return false;
14909 }
14910
14911 static bool
14912 CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) {
14913 // C++ [basic.stc.dynamic.allocation]p1:
14914 // A program is ill-formed if an allocation function is declared in a
14915 // namespace scope other than global scope or declared static in global
14916 // scope.
14917 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
14918 return true;
14919
14920 CanQualType SizeTy =
14921 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType());
14922
14923 // C++ [basic.stc.dynamic.allocation]p1:
14924 // The return type shall be void*. The first parameter shall have type
14925 // std::size_t.
14926 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy,
14927 SizeTy,
14928 diag::err_operator_new_dependent_param_type,
14929 diag::err_operator_new_param_type))
14930 return true;
14931
14932 // C++ [basic.stc.dynamic.allocation]p1:
14933 // The first parameter shall not have an associated default argument.
14934 if (FnDecl->getParamDecl(0)->hasDefaultArg())
14935 return SemaRef.Diag(FnDecl->getLocation(),
14936 diag::err_operator_new_default_arg)
14937 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange();
14938
14939 return false;
14940 }
14941
14942 static bool
14943 CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) {
14944 // C++ [basic.stc.dynamic.deallocation]p1:
14945 // A program is ill-formed if deallocation functions are declared in a
14946 // namespace scope other than global scope or declared static in global
14947 // scope.
14948 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
14949 return true;
14950
14951 auto *MD = dyn_cast<CXXMethodDecl>(FnDecl);
14952
14953 // C++ P0722:
14954 // Within a class C, the first parameter of a destroying operator delete
14955 // shall be of type C *. The first parameter of any other deallocation
14956 // function shall be of type void *.
14957 CanQualType ExpectedFirstParamType =
14958 MD && MD->isDestroyingOperatorDelete()
14959 ? SemaRef.Context.getCanonicalType(SemaRef.Context.getPointerType(
14960 SemaRef.Context.getRecordType(MD->getParent())))
14961 : SemaRef.Context.VoidPtrTy;
14962
14963 // C++ [basic.stc.dynamic.deallocation]p2:
14964 // Each deallocation function shall return void
14965 if (CheckOperatorNewDeleteTypes(
14966 SemaRef, FnDecl, SemaRef.Context.VoidTy, ExpectedFirstParamType,
14967 diag::err_operator_delete_dependent_param_type,
14968 diag::err_operator_delete_param_type))
14969 return true;
14970
14971 // C++ P0722:
14972 // A destroying operator delete shall be a usual deallocation function.
14973 if (MD && !MD->getParent()->isDependentContext() &&
14974 MD->isDestroyingOperatorDelete() &&
14975 !SemaRef.isUsualDeallocationFunction(MD)) {
14976 SemaRef.Diag(MD->getLocation(),
14977 diag::err_destroying_operator_delete_not_usual);
14978 return true;
14979 }
14980
14981 return false;
14982 }
14983
14984 /// CheckOverloadedOperatorDeclaration - Check whether the declaration
14985 /// of this overloaded operator is well-formed. If so, returns false;
14986 /// otherwise, emits appropriate diagnostics and returns true.
14987 bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) {
14988 assert(FnDecl && FnDecl->isOverloadedOperator() &&
14989 "Expected an overloaded operator declaration");
14990
14991 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator();
14992
14993 // C++ [over.oper]p5:
14994 // The allocation and deallocation functions, operator new,
14995 // operator new[], operator delete and operator delete[], are
14996 // described completely in 3.7.3. The attributes and restrictions
14997 // found in the rest of this subclause do not apply to them unless
14998 // explicitly stated in 3.7.3.
14999 if (Op == OO_Delete || Op == OO_Array_Delete)
15000 return CheckOperatorDeleteDeclaration(*this, FnDecl);
15001
15002 if (Op == OO_New || Op == OO_Array_New)
15003 return CheckOperatorNewDeclaration(*this, FnDecl);
15004
15005 // C++ [over.oper]p6:
15006 // An operator function shall either be a non-static member
15007 // function or be a non-member function and have at least one
15008 // parameter whose type is a class, a reference to a class, an
15009 // enumeration, or a reference to an enumeration.
15010 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) {
15011 if (MethodDecl->isStatic())
15012 return Diag(FnDecl->getLocation(),
15013 diag::err_operator_overload_static) << FnDecl->getDeclName();
15014 } else {
15015 bool ClassOrEnumParam = false;
15016 for (auto Param : FnDecl->parameters()) {
15017 QualType ParamType = Param->getType().getNonReferenceType();
15018 if (ParamType->isDependentType() || ParamType->isRecordType() ||
15019 ParamType->isEnumeralType()) {
15020 ClassOrEnumParam = true;
15021 break;
15022 }
15023 }
15024
15025 if (!ClassOrEnumParam)
15026 return Diag(FnDecl->getLocation(),
15027 diag::err_operator_overload_needs_class_or_enum)
15028 << FnDecl->getDeclName();
15029 }
15030
15031 // C++ [over.oper]p8:
15032 // An operator function cannot have default arguments (8.3.6),
15033 // except where explicitly stated below.
15034 //
15035 // Only the function-call operator allows default arguments
15036 // (C++ [over.call]p1).
15037 if (Op != OO_Call) {
15038 for (auto Param : FnDecl->parameters()) {
15039 if (Param->hasDefaultArg())
15040 return Diag(Param->getLocation(),
15041 diag::err_operator_overload_default_arg)
15042 << FnDecl->getDeclName() << Param->getDefaultArgRange();
15043 }
15044 }
15045
15046 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = {
15047 { false, false, false }
15048 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
15049 , { Unary, Binary, MemberOnly }
15050 #include "clang/Basic/OperatorKinds.def"
15051 };
15052
15053 bool CanBeUnaryOperator = OperatorUses[Op][0];
15054 bool CanBeBinaryOperator = OperatorUses[Op][1];
15055 bool MustBeMemberOperator = OperatorUses[Op][2];
15056
15057 // C++ [over.oper]p8:
15058 // [...] Operator functions cannot have more or fewer parameters
15059 // than the number required for the corresponding operator, as
15060 // described in the rest of this subclause.
15061 unsigned NumParams = FnDecl->getNumParams()
15062 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0);
15063 if (Op != OO_Call &&
15064 ((NumParams == 1 && !CanBeUnaryOperator) ||
15065 (NumParams == 2 && !CanBeBinaryOperator) ||
15066 (NumParams < 1) || (NumParams > 2))) {
15067 // We have the wrong number of parameters.
15068 unsigned ErrorKind;
15069 if (CanBeUnaryOperator && CanBeBinaryOperator) {
15070 ErrorKind = 2; // 2 -> unary or binary.
15071 } else if (CanBeUnaryOperator) {
15072 ErrorKind = 0; // 0 -> unary
15073 } else {
15074 assert(CanBeBinaryOperator &&
15075 "All non-call overloaded operators are unary or binary!");
15076 ErrorKind = 1; // 1 -> binary
15077 }
15078
15079 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be)
15080 << FnDecl->getDeclName() << NumParams << ErrorKind;
15081 }
15082
15083 // Overloaded operators other than operator() cannot be variadic.
15084 if (Op != OO_Call &&
15085 FnDecl->getType()->castAs<FunctionProtoType>()->isVariadic()) {
15086 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic)
15087 << FnDecl->getDeclName();
15088 }
15089
15090 // Some operators must be non-static member functions.
15091 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) {
15092 return Diag(FnDecl->getLocation(),
15093 diag::err_operator_overload_must_be_member)
15094 << FnDecl->getDeclName();
15095 }
15096
15097 // C++ [over.inc]p1:
15098 // The user-defined function called operator++ implements the
15099 // prefix and postfix ++ operator. If this function is a member
15100 // function with no parameters, or a non-member function with one
15101 // parameter of class or enumeration type, it defines the prefix
15102 // increment operator ++ for objects of that type. If the function
15103 // is a member function with one parameter (which shall be of type
15104 // int) or a non-member function with two parameters (the second
15105 // of which shall be of type int), it defines the postfix
15106 // increment operator ++ for objects of that type.
15107 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) {
15108 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1);
15109 QualType ParamType = LastParam->getType();
15110
15111 if (!ParamType->isSpecificBuiltinType(BuiltinType::Int) &&
15112 !ParamType->isDependentType())
15113 return Diag(LastParam->getLocation(),
15114 diag::err_operator_overload_post_incdec_must_be_int)
15115 << LastParam->getType() << (Op == OO_MinusMinus);
15116 }
15117
15118 return false;
15119 }
15120
15121 static bool
15122 checkLiteralOperatorTemplateParameterList(Sema &SemaRef,
15123 FunctionTemplateDecl *TpDecl) {
15124 TemplateParameterList *TemplateParams = TpDecl->getTemplateParameters();
15125
15126 // Must have one or two template parameters.
15127 if (TemplateParams->size() == 1) {
15128 NonTypeTemplateParmDecl *PmDecl =
15129 dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(0));
15130
15131 // The template parameter must be a char parameter pack.
15132 if (PmDecl && PmDecl->isTemplateParameterPack() &&
15133 SemaRef.Context.hasSameType(PmDecl->getType(), SemaRef.Context.CharTy))
15134 return false;
15135
15136 } else if (TemplateParams->size() == 2) {
15137 TemplateTypeParmDecl *PmType =
15138 dyn_cast<TemplateTypeParmDecl>(TemplateParams->getParam(0));
15139 NonTypeTemplateParmDecl *PmArgs =
15140 dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(1));
15141
15142 // The second template parameter must be a parameter pack with the
15143 // first template parameter as its type.
15144 if (PmType && PmArgs && !PmType->isTemplateParameterPack() &&
15145 PmArgs->isTemplateParameterPack()) {
15146 const TemplateTypeParmType *TArgs =
15147 PmArgs->getType()->getAs<TemplateTypeParmType>();
15148 if (TArgs && TArgs->getDepth() == PmType->getDepth() &&
15149 TArgs->getIndex() == PmType->getIndex()) {
15150 if (!SemaRef.inTemplateInstantiation())
15151 SemaRef.Diag(TpDecl->getLocation(),
15152 diag::ext_string_literal_operator_template);
15153 return false;
15154 }
15155 }
15156 }
15157
15158 SemaRef.Diag(TpDecl->getTemplateParameters()->getSourceRange().getBegin(),
15159 diag::err_literal_operator_template)
15160 << TpDecl->getTemplateParameters()->getSourceRange();
15161 return true;
15162 }
15163
15164 /// CheckLiteralOperatorDeclaration - Check whether the declaration
15165 /// of this literal operator function is well-formed. If so, returns
15166 /// false; otherwise, emits appropriate diagnostics and returns true.
15167 bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) {
15168 if (isa<CXXMethodDecl>(FnDecl)) {
15169 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace)
15170 << FnDecl->getDeclName();
15171 return true;
15172 }
15173
15174 if (FnDecl->isExternC()) {
15175 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c);
15176 if (const LinkageSpecDecl *LSD =
15177 FnDecl->getDeclContext()->getExternCContext())
15178 Diag(LSD->getExternLoc(), diag::note_extern_c_begins_here);
15179 return true;
15180 }
15181
15182 // This might be the definition of a literal operator template.
15183 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate();
15184
15185 // This might be a specialization of a literal operator template.
15186 if (!TpDecl)
15187 TpDecl = FnDecl->getPrimaryTemplate();
15188
15189 // template <char...> type operator "" name() and
15190 // template <class T, T...> type operator "" name() are the only valid
15191 // template signatures, and the only valid signatures with no parameters.
15192 if (TpDecl) {
15193 if (FnDecl->param_size() != 0) {
15194 Diag(FnDecl->getLocation(),
15195 diag::err_literal_operator_template_with_params);
15196 return true;
15197 }
15198
15199 if (checkLiteralOperatorTemplateParameterList(*this, TpDecl))
15200 return true;
15201
15202 } else if (FnDecl->param_size() == 1) {
15203 const ParmVarDecl *Param = FnDecl->getParamDecl(0);
15204
15205 QualType ParamType = Param->getType().getUnqualifiedType();
15206
15207 // Only unsigned long long int, long double, any character type, and const
15208 // char * are allowed as the only parameters.
15209 if (ParamType->isSpecificBuiltinType(BuiltinType::ULongLong) ||
15210 ParamType->isSpecificBuiltinType(BuiltinType::LongDouble) ||
15211 Context.hasSameType(ParamType, Context.CharTy) ||
15212 Context.hasSameType(ParamType, Context.WideCharTy) ||
15213 Context.hasSameType(ParamType, Context.Char8Ty) ||
15214 Context.hasSameType(ParamType, Context.Char16Ty) ||
15215 Context.hasSameType(ParamType, Context.Char32Ty)) {
15216 } else if (const PointerType *Ptr = ParamType->getAs<PointerType>()) {
15217 QualType InnerType = Ptr->getPointeeType();
15218
15219 // Pointer parameter must be a const char *.
15220 if (!(Context.hasSameType(InnerType.getUnqualifiedType(),
15221 Context.CharTy) &&
15222 InnerType.isConstQualified() && !InnerType.isVolatileQualified())) {
15223 Diag(Param->getSourceRange().getBegin(),
15224 diag::err_literal_operator_param)
15225 << ParamType << "'const char *'" << Param->getSourceRange();
15226 return true;
15227 }
15228
15229 } else if (ParamType->isRealFloatingType()) {
15230 Diag(Param->getSourceRange().getBegin(), diag::err_literal_operator_param)
15231 << ParamType << Context.LongDoubleTy << Param->getSourceRange();
15232 return true;
15233
15234 } else if (ParamType->isIntegerType()) {
15235 Diag(Param->getSourceRange().getBegin(), diag::err_literal_operator_param)
15236 << ParamType << Context.UnsignedLongLongTy << Param->getSourceRange();
15237 return true;
15238
15239 } else {
15240 Diag(Param->getSourceRange().getBegin(),
15241 diag::err_literal_operator_invalid_param)
15242 << ParamType << Param->getSourceRange();
15243 return true;
15244 }
15245
15246 } else if (FnDecl->param_size() == 2) {
15247 FunctionDecl::param_iterator Param = FnDecl->param_begin();
15248
15249 // First, verify that the first parameter is correct.
15250
15251 QualType FirstParamType = (*Param)->getType().getUnqualifiedType();
15252
15253 // Two parameter function must have a pointer to const as a
15254 // first parameter; let's strip those qualifiers.
15255 const PointerType *PT = FirstParamType->getAs<PointerType>();
15256
15257 if (!PT) {
15258 Diag((*Param)->getSourceRange().getBegin(),
15259 diag::err_literal_operator_param)
15260 << FirstParamType << "'const char *'" << (*Param)->getSourceRange();
15261 return true;
15262 }
15263
15264 QualType PointeeType = PT->getPointeeType();
15265 // First parameter must be const
15266 if (!PointeeType.isConstQualified() || PointeeType.isVolatileQualified()) {
15267 Diag((*Param)->getSourceRange().getBegin(),
15268 diag::err_literal_operator_param)
15269 << FirstParamType << "'const char *'" << (*Param)->getSourceRange();
15270 return true;
15271 }
15272
15273 QualType InnerType = PointeeType.getUnqualifiedType();
15274 // Only const char *, const wchar_t*, const char8_t*, const char16_t*, and
15275 // const char32_t* are allowed as the first parameter to a two-parameter
15276 // function
15277 if (!(Context.hasSameType(InnerType, Context.CharTy) ||
15278 Context.hasSameType(InnerType, Context.WideCharTy) ||
15279 Context.hasSameType(InnerType, Context.Char8Ty) ||
15280 Context.hasSameType(InnerType, Context.Char16Ty) ||
15281 Context.hasSameType(InnerType, Context.Char32Ty))) {
15282 Diag((*Param)->getSourceRange().getBegin(),
15283 diag::err_literal_operator_param)
15284 << FirstParamType << "'const char *'" << (*Param)->getSourceRange();
15285 return true;
15286 }
15287
15288 // Move on to the second and final parameter.
15289 ++Param;
15290
15291 // The second parameter must be a std::size_t.
15292 QualType SecondParamType = (*Param)->getType().getUnqualifiedType();
15293 if (!Context.hasSameType(SecondParamType, Context.getSizeType())) {
15294 Diag((*Param)->getSourceRange().getBegin(),
15295 diag::err_literal_operator_param)
15296 << SecondParamType << Context.getSizeType()
15297 << (*Param)->getSourceRange();
15298 return true;
15299 }
15300 } else {
15301 Diag(FnDecl->getLocation(), diag::err_literal_operator_bad_param_count);
15302 return true;
15303 }
15304
15305 // Parameters are good.
15306
15307 // A parameter-declaration-clause containing a default argument is not
15308 // equivalent to any of the permitted forms.
15309 for (auto Param : FnDecl->parameters()) {
15310 if (Param->hasDefaultArg()) {
15311 Diag(Param->getDefaultArgRange().getBegin(),
15312 diag::err_literal_operator_default_argument)
15313 << Param->getDefaultArgRange();
15314 break;
15315 }
15316 }
15317
15318 StringRef LiteralName
15319 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName();
15320 if (LiteralName[0] != '_' &&
15321 !getSourceManager().isInSystemHeader(FnDecl->getLocation())) {
15322 // C++11 [usrlit.suffix]p1:
15323 // Literal suffix identifiers that do not start with an underscore
15324 // are reserved for future standardization.
15325 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved)
15326 << StringLiteralParser::isValidUDSuffix(getLangOpts(), LiteralName);
15327 }
15328
15329 return false;
15330 }
15331
15332 /// ActOnStartLinkageSpecification - Parsed the beginning of a C++
15333 /// linkage specification, including the language and (if present)
15334 /// the '{'. ExternLoc is the location of the 'extern', Lang is the
15335 /// language string literal. LBraceLoc, if valid, provides the location of
15336 /// the '{' brace. Otherwise, this linkage specification does not
15337 /// have any braces.
15338 Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc,
15339 Expr *LangStr,
15340 SourceLocation LBraceLoc) {
15341 StringLiteral *Lit = cast<StringLiteral>(LangStr);
15342 if (!Lit->isAscii()) {
15343 Diag(LangStr->getExprLoc(), diag::err_language_linkage_spec_not_ascii)
15344 << LangStr->getSourceRange();
15345 return nullptr;
15346 }
15347
15348 StringRef Lang = Lit->getString();
15349 LinkageSpecDecl::LanguageIDs Language;
15350 if (Lang == "C")
15351 Language = LinkageSpecDecl::lang_c;
15352 else if (Lang == "C++")
15353 Language = LinkageSpecDecl::lang_cxx;
15354 else {
15355 Diag(LangStr->getExprLoc(), diag::err_language_linkage_spec_unknown)
15356 << LangStr->getSourceRange();
15357 return nullptr;
15358 }
15359
15360 // FIXME: Add all the various semantics of linkage specifications
15361
15362 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, ExternLoc,
15363 LangStr->getExprLoc(), Language,
15364 LBraceLoc.isValid());
15365 CurContext->addDecl(D);
15366 PushDeclContext(S, D);
15367 return D;
15368 }
15369
15370 /// ActOnFinishLinkageSpecification - Complete the definition of
15371 /// the C++ linkage specification LinkageSpec. If RBraceLoc is
15372 /// valid, it's the position of the closing '}' brace in a linkage
15373 /// specification that uses braces.
15374 Decl *Sema::ActOnFinishLinkageSpecification(Scope *S,
15375 Decl *LinkageSpec,
15376 SourceLocation RBraceLoc) {
15377 if (RBraceLoc.isValid()) {
15378 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec);
15379 LSDecl->setRBraceLoc(RBraceLoc);
15380 }
15381 PopDeclContext();
15382 return LinkageSpec;
15383 }
15384
15385 Decl *Sema::ActOnEmptyDeclaration(Scope *S,
15386 const ParsedAttributesView &AttrList,
15387 SourceLocation SemiLoc) {
15388 Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc);
15389 // Attribute declarations appertain to empty declaration so we handle
15390 // them here.
15391 ProcessDeclAttributeList(S, ED, AttrList);
15392
15393 CurContext->addDecl(ED);
15394 return ED;
15395 }
15396
15397 /// Perform semantic analysis for the variable declaration that
15398 /// occurs within a C++ catch clause, returning the newly-created
15399 /// variable.
15400 VarDecl *Sema::BuildExceptionDeclaration(Scope *S,
15401 TypeSourceInfo *TInfo,
15402 SourceLocation StartLoc,
15403 SourceLocation Loc,
15404 IdentifierInfo *Name) {
15405 bool Invalid = false;
15406 QualType ExDeclType = TInfo->getType();
15407
15408 // Arrays and functions decay.
15409 if (ExDeclType->isArrayType())
15410 ExDeclType = Context.getArrayDecayedType(ExDeclType);
15411 else if (ExDeclType->isFunctionType())
15412 ExDeclType = Context.getPointerType(ExDeclType);
15413
15414 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type.
15415 // The exception-declaration shall not denote a pointer or reference to an
15416 // incomplete type, other than [cv] void*.
15417 // N2844 forbids rvalue references.
15418 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) {
15419 Diag(Loc, diag::err_catch_rvalue_ref);
15420 Invalid = true;
15421 }
15422
15423 if (ExDeclType->isVariablyModifiedType()) {
15424 Diag(Loc, diag::err_catch_variably_modified) << ExDeclType;
15425 Invalid = true;
15426 }
15427
15428 QualType BaseType = ExDeclType;
15429 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference
15430 unsigned DK = diag::err_catch_incomplete;
15431 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) {
15432 BaseType = Ptr->getPointeeType();
15433 Mode = 1;
15434 DK = diag::err_catch_incomplete_ptr;
15435 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) {
15436 // For the purpose of error recovery, we treat rvalue refs like lvalue refs.
15437 BaseType = Ref->getPointeeType();
15438 Mode = 2;
15439 DK = diag::err_catch_incomplete_ref;
15440 }
15441 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) &&
15442 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK))
15443 Invalid = true;
15444
15445 if (!Invalid && !ExDeclType->isDependentType() &&
15446 RequireNonAbstractType(Loc, ExDeclType,
15447 diag::err_abstract_type_in_decl,
15448 AbstractVariableType))
15449 Invalid = true;
15450
15451 // Only the non-fragile NeXT runtime currently supports C++ catches
15452 // of ObjC types, and no runtime supports catching ObjC types by value.
15453 if (!Invalid && getLangOpts().ObjC) {
15454 QualType T = ExDeclType;
15455 if (const ReferenceType *RT = T->getAs<ReferenceType>())
15456 T = RT->getPointeeType();
15457
15458 if (T->isObjCObjectType()) {
15459 Diag(Loc, diag::err_objc_object_catch);
15460 Invalid = true;
15461 } else if (T->isObjCObjectPointerType()) {
15462 // FIXME: should this be a test for macosx-fragile specifically?
15463 if (getLangOpts().ObjCRuntime.isFragile())
15464 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile);
15465 }
15466 }
15467
15468 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name,
15469 ExDeclType, TInfo, SC_None);
15470 ExDecl->setExceptionVariable(true);
15471
15472 // In ARC, infer 'retaining' for variables of retainable type.
15473 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl))
15474 Invalid = true;
15475
15476 if (!Invalid && !ExDeclType->isDependentType()) {
15477 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) {
15478 // Insulate this from anything else we might currently be parsing.
15479 EnterExpressionEvaluationContext scope(
15480 *this, ExpressionEvaluationContext::PotentiallyEvaluated);
15481
15482 // C++ [except.handle]p16:
15483 // The object declared in an exception-declaration or, if the
15484 // exception-declaration does not specify a name, a temporary (12.2) is
15485 // copy-initialized (8.5) from the exception object. [...]
15486 // The object is destroyed when the handler exits, after the destruction
15487 // of any automatic objects initialized within the handler.
15488 //
15489 // We just pretend to initialize the object with itself, then make sure
15490 // it can be destroyed later.
15491 QualType initType = Context.getExceptionObjectType(ExDeclType);
15492
15493 InitializedEntity entity =
15494 InitializedEntity::InitializeVariable(ExDecl);
15495 InitializationKind initKind =
15496 InitializationKind::CreateCopy(Loc, SourceLocation());
15497
15498 Expr *opaqueValue =
15499 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary);
15500 InitializationSequence sequence(*this, entity, initKind, opaqueValue);
15501 ExprResult result = sequence.Perform(*this, entity, initKind, opaqueValue);
15502 if (result.isInvalid())
15503 Invalid = true;
15504 else {
15505 // If the constructor used was non-trivial, set this as the
15506 // "initializer".
15507 CXXConstructExpr *construct = result.getAs<CXXConstructExpr>();
15508 if (!construct->getConstructor()->isTrivial()) {
15509 Expr *init = MaybeCreateExprWithCleanups(construct);
15510 ExDecl->setInit(init);
15511 }
15512
15513 // And make sure it's destructable.
15514 FinalizeVarWithDestructor(ExDecl, recordType);
15515 }
15516 }
15517 }
15518
15519 if (Invalid)
15520 ExDecl->setInvalidDecl();
15521
15522 return ExDecl;
15523 }
15524
15525 /// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch
15526 /// handler.
15527 Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) {
15528 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
15529 bool Invalid = D.isInvalidType();
15530
15531 // Check for unexpanded parameter packs.
15532 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
15533 UPPC_ExceptionType)) {
15534 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
15535 D.getIdentifierLoc());
15536 Invalid = true;
15537 }
15538
15539 IdentifierInfo *II = D.getIdentifier();
15540 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(),
15541 LookupOrdinaryName,
15542 ForVisibleRedeclaration)) {
15543 // The scope should be freshly made just for us. There is just no way
15544 // it contains any previous declaration, except for function parameters in
15545 // a function-try-block's catch statement.
15546 assert(!S->isDeclScope(PrevDecl));
15547 if (isDeclInScope(PrevDecl, CurContext, S)) {
15548 Diag(D.getIdentifierLoc(), diag::err_redefinition)
15549 << D.getIdentifier();
15550 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
15551 Invalid = true;
15552 } else if (PrevDecl->isTemplateParameter())
15553 // Maybe we will complain about the shadowed template parameter.
15554 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
15555 }
15556
15557 if (D.getCXXScopeSpec().isSet() && !Invalid) {
15558 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator)
15559 << D.getCXXScopeSpec().getRange();
15560 Invalid = true;
15561 }
15562
15563 VarDecl *ExDecl = BuildExceptionDeclaration(
15564 S, TInfo, D.getBeginLoc(), D.getIdentifierLoc(), D.getIdentifier());
15565 if (Invalid)
15566 ExDecl->setInvalidDecl();
15567
15568 // Add the exception declaration into this scope.
15569 if (II)
15570 PushOnScopeChains(ExDecl, S);
15571 else
15572 CurContext->addDecl(ExDecl);
15573
15574 ProcessDeclAttributes(S, ExDecl, D);
15575 return ExDecl;
15576 }
15577
15578 Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc,
15579 Expr *AssertExpr,
15580 Expr *AssertMessageExpr,
15581 SourceLocation RParenLoc) {
15582 StringLiteral *AssertMessage =
15583 AssertMessageExpr ? cast<StringLiteral>(AssertMessageExpr) : nullptr;
15584
15585 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression))
15586 return nullptr;
15587
15588 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr,
15589 AssertMessage, RParenLoc, false);
15590 }
15591
15592 Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc,
15593 Expr *AssertExpr,
15594 StringLiteral *AssertMessage,
15595 SourceLocation RParenLoc,
15596 bool Failed) {
15597 assert(AssertExpr != nullptr && "Expected non-null condition");
15598 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() &&
15599 !Failed) {
15600 // In a static_assert-declaration, the constant-expression shall be a
15601 // constant expression that can be contextually converted to bool.
15602 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr);
15603 if (Converted.isInvalid())
15604 Failed = true;
15605
15606 ExprResult FullAssertExpr =
15607 ActOnFinishFullExpr(Converted.get(), StaticAssertLoc,
15608 /*DiscardedValue*/ false,
15609 /*IsConstexpr*/ true);
15610 if (FullAssertExpr.isInvalid())
15611 Failed = true;
15612 else
15613 AssertExpr = FullAssertExpr.get();
15614
15615 llvm::APSInt Cond;
15616 if (!Failed && VerifyIntegerConstantExpression(AssertExpr, &Cond,
15617 diag::err_static_assert_expression_is_not_constant,
15618 /*AllowFold=*/false).isInvalid())
15619 Failed = true;
15620
15621 if (!Failed && !Cond) {
15622 SmallString<256> MsgBuffer;
15623 llvm::raw_svector_ostream Msg(MsgBuffer);
15624 if (AssertMessage)
15625 AssertMessage->printPretty(Msg, nullptr, getPrintingPolicy());
15626
15627 Expr *InnerCond = nullptr;
15628 std::string InnerCondDescription;
15629 std::tie(InnerCond, InnerCondDescription) =
15630 findFailedBooleanCondition(Converted.get());
15631 if (InnerCond && isa<ConceptSpecializationExpr>(InnerCond)) {
15632 // Drill down into concept specialization expressions to see why they
15633 // weren't satisfied.
15634 Diag(StaticAssertLoc, diag::err_static_assert_failed)
15635 << !AssertMessage << Msg.str() << AssertExpr->getSourceRange();
15636 ConstraintSatisfaction Satisfaction;
15637 if (!CheckConstraintSatisfaction(InnerCond, Satisfaction))
15638 DiagnoseUnsatisfiedConstraint(Satisfaction);
15639 } else if (InnerCond && !isa<CXXBoolLiteralExpr>(InnerCond)
15640 && !isa<IntegerLiteral>(InnerCond)) {
15641 Diag(StaticAssertLoc, diag::err_static_assert_requirement_failed)
15642 << InnerCondDescription << !AssertMessage
15643 << Msg.str() << InnerCond->getSourceRange();
15644 } else {
15645 Diag(StaticAssertLoc, diag::err_static_assert_failed)
15646 << !AssertMessage << Msg.str() << AssertExpr->getSourceRange();
15647 }
15648 Failed = true;
15649 }
15650 } else {
15651 ExprResult FullAssertExpr = ActOnFinishFullExpr(AssertExpr, StaticAssertLoc,
15652 /*DiscardedValue*/false,
15653 /*IsConstexpr*/true);
15654 if (FullAssertExpr.isInvalid())
15655 Failed = true;
15656 else
15657 AssertExpr = FullAssertExpr.get();
15658 }
15659
15660 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc,
15661 AssertExpr, AssertMessage, RParenLoc,
15662 Failed);
15663
15664 CurContext->addDecl(Decl);
15665 return Decl;
15666 }
15667
15668 /// Perform semantic analysis of the given friend type declaration.
15669 ///
15670 /// \returns A friend declaration that.
15671 FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart,
15672 SourceLocation FriendLoc,
15673 TypeSourceInfo *TSInfo) {
15674 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration");
15675
15676 QualType T = TSInfo->getType();
15677 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange();
15678
15679 // C++03 [class.friend]p2:
15680 // An elaborated-type-specifier shall be used in a friend declaration
15681 // for a class.*
15682 //
15683 // * The class-key of the elaborated-type-specifier is required.
15684 if (!CodeSynthesisContexts.empty()) {
15685 // Do not complain about the form of friend template types during any kind
15686 // of code synthesis. For template instantiation, we will have complained
15687 // when the template was defined.
15688 } else {
15689 if (!T->isElaboratedTypeSpecifier()) {
15690 // If we evaluated the type to a record type, suggest putting
15691 // a tag in front.
15692 if (const RecordType *RT = T->getAs<RecordType>()) {
15693 RecordDecl *RD = RT->getDecl();
15694
15695 SmallString<16> InsertionText(" ");
15696 InsertionText += RD->getKindName();
15697
15698 Diag(TypeRange.getBegin(),
15699 getLangOpts().CPlusPlus11 ?
15700 diag::warn_cxx98_compat_unelaborated_friend_type :
15701 diag::ext_unelaborated_friend_type)
15702 << (unsigned) RD->getTagKind()
15703 << T
15704 << FixItHint::CreateInsertion(getLocForEndOfToken(FriendLoc),
15705 InsertionText);
15706 } else {
15707 Diag(FriendLoc,
15708 getLangOpts().CPlusPlus11 ?
15709 diag::warn_cxx98_compat_nonclass_type_friend :
15710 diag::ext_nonclass_type_friend)
15711 << T
15712 << TypeRange;
15713 }
15714 } else if (T->getAs<EnumType>()) {
15715 Diag(FriendLoc,
15716 getLangOpts().CPlusPlus11 ?
15717 diag::warn_cxx98_compat_enum_friend :
15718 diag::ext_enum_friend)
15719 << T
15720 << TypeRange;
15721 }
15722
15723 // C++11 [class.friend]p3:
15724 // A friend declaration that does not declare a function shall have one
15725 // of the following forms:
15726 // friend elaborated-type-specifier ;
15727 // friend simple-type-specifier ;
15728 // friend typename-specifier ;
15729 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc)
15730 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T;
15731 }
15732
15733 // If the type specifier in a friend declaration designates a (possibly
15734 // cv-qualified) class type, that class is declared as a friend; otherwise,
15735 // the friend declaration is ignored.
15736 return FriendDecl::Create(Context, CurContext,
15737 TSInfo->getTypeLoc().getBeginLoc(), TSInfo,
15738 FriendLoc);
15739 }
15740
15741 /// Handle a friend tag declaration where the scope specifier was
15742 /// templated.
15743 Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc,
15744 unsigned TagSpec, SourceLocation TagLoc,
15745 CXXScopeSpec &SS, IdentifierInfo *Name,
15746 SourceLocation NameLoc,
15747 const ParsedAttributesView &Attr,
15748 MultiTemplateParamsArg TempParamLists) {
15749 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
15750
15751 bool IsMemberSpecialization = false;
15752 bool Invalid = false;
15753
15754 if (TemplateParameterList *TemplateParams =
15755 MatchTemplateParametersToScopeSpecifier(
15756 TagLoc, NameLoc, SS, nullptr, TempParamLists, /*friend*/ true,
15757 IsMemberSpecialization, Invalid)) {
15758 if (TemplateParams->size() > 0) {
15759 // This is a declaration of a class template.
15760 if (Invalid)
15761 return nullptr;
15762
15763 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, SS, Name,
15764 NameLoc, Attr, TemplateParams, AS_public,
15765 /*ModulePrivateLoc=*/SourceLocation(),
15766 FriendLoc, TempParamLists.size() - 1,
15767 TempParamLists.data()).get();
15768 } else {
15769 // The "template<>" header is extraneous.
15770 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
15771 << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
15772 IsMemberSpecialization = true;
15773 }
15774 }
15775
15776 if (Invalid) return nullptr;
15777
15778 bool isAllExplicitSpecializations = true;
15779 for (unsigned I = TempParamLists.size(); I-- > 0; ) {
15780 if (TempParamLists[I]->size()) {
15781 isAllExplicitSpecializations = false;
15782 break;
15783 }
15784 }
15785
15786 // FIXME: don't ignore attributes.
15787
15788 // If it's explicit specializations all the way down, just forget
15789 // about the template header and build an appropriate non-templated
15790 // friend. TODO: for source fidelity, remember the headers.
15791 if (isAllExplicitSpecializations) {
15792 if (SS.isEmpty()) {
15793 bool Owned = false;
15794 bool IsDependent = false;
15795 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc,
15796 Attr, AS_public,
15797 /*ModulePrivateLoc=*/SourceLocation(),
15798 MultiTemplateParamsArg(), Owned, IsDependent,
15799 /*ScopedEnumKWLoc=*/SourceLocation(),
15800 /*ScopedEnumUsesClassTag=*/false,
15801 /*UnderlyingType=*/TypeResult(),
15802 /*IsTypeSpecifier=*/false,
15803 /*IsTemplateParamOrArg=*/false);
15804 }
15805
15806 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
15807 ElaboratedTypeKeyword Keyword
15808 = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
15809 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc,
15810 *Name, NameLoc);
15811 if (T.isNull())
15812 return nullptr;
15813
15814 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
15815 if (isa<DependentNameType>(T)) {
15816 DependentNameTypeLoc TL =
15817 TSI->getTypeLoc().castAs<DependentNameTypeLoc>();
15818 TL.setElaboratedKeywordLoc(TagLoc);
15819 TL.setQualifierLoc(QualifierLoc);
15820 TL.setNameLoc(NameLoc);
15821 } else {
15822 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>();
15823 TL.setElaboratedKeywordLoc(TagLoc);
15824 TL.setQualifierLoc(QualifierLoc);
15825 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc);
15826 }
15827
15828 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
15829 TSI, FriendLoc, TempParamLists);
15830 Friend->setAccess(AS_public);
15831 CurContext->addDecl(Friend);
15832 return Friend;
15833 }
15834
15835 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?");
15836
15837
15838
15839 // Handle the case of a templated-scope friend class. e.g.
15840 // template <class T> class A<T>::B;
15841 // FIXME: we don't support these right now.
15842 Diag(NameLoc, diag::warn_template_qualified_friend_unsupported)
15843 << SS.getScopeRep() << SS.getRange() << cast<CXXRecordDecl>(CurContext);
15844 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
15845 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name);
15846 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
15847 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>();
15848 TL.setElaboratedKeywordLoc(TagLoc);
15849 TL.setQualifierLoc(SS.getWithLocInContext(Context));
15850 TL.setNameLoc(NameLoc);
15851
15852 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
15853 TSI, FriendLoc, TempParamLists);
15854 Friend->setAccess(AS_public);
15855 Friend->setUnsupportedFriend(true);
15856 CurContext->addDecl(Friend);
15857 return Friend;
15858 }
15859
15860 /// Handle a friend type declaration. This works in tandem with
15861 /// ActOnTag.
15862 ///
15863 /// Notes on friend class templates:
15864 ///
15865 /// We generally treat friend class declarations as if they were
15866 /// declaring a class. So, for example, the elaborated type specifier
15867 /// in a friend declaration is required to obey the restrictions of a
15868 /// class-head (i.e. no typedefs in the scope chain), template
15869 /// parameters are required to match up with simple template-ids, &c.
15870 /// However, unlike when declaring a template specialization, it's
15871 /// okay to refer to a template specialization without an empty
15872 /// template parameter declaration, e.g.
15873 /// friend class A<T>::B<unsigned>;
15874 /// We permit this as a special case; if there are any template
15875 /// parameters present at all, require proper matching, i.e.
15876 /// template <> template <class T> friend class A<int>::B;
15877 Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS,
15878 MultiTemplateParamsArg TempParams) {
15879 SourceLocation Loc = DS.getBeginLoc();
15880
15881 assert(DS.isFriendSpecified());
15882 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
15883
15884 // C++ [class.friend]p3:
15885 // A friend declaration that does not declare a function shall have one of
15886 // the following forms:
15887 // friend elaborated-type-specifier ;
15888 // friend simple-type-specifier ;
15889 // friend typename-specifier ;
15890 //
15891 // Any declaration with a type qualifier does not have that form. (It's
15892 // legal to specify a qualified type as a friend, you just can't write the
15893 // keywords.)
15894 if (DS.getTypeQualifiers()) {
15895 if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
15896 Diag(DS.getConstSpecLoc(), diag::err_friend_decl_spec) << "const";
15897 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
15898 Diag(DS.getVolatileSpecLoc(), diag::err_friend_decl_spec) << "volatile";
15899 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict)
15900 Diag(DS.getRestrictSpecLoc(), diag::err_friend_decl_spec) << "restrict";
15901 if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic)
15902 Diag(DS.getAtomicSpecLoc(), diag::err_friend_decl_spec) << "_Atomic";
15903 if (DS.getTypeQualifiers() & DeclSpec::TQ_unaligned)
15904 Diag(DS.getUnalignedSpecLoc(), diag::err_friend_decl_spec) << "__unaligned";
15905 }
15906
15907 // Try to convert the decl specifier to a type. This works for
15908 // friend templates because ActOnTag never produces a ClassTemplateDecl
15909 // for a TUK_Friend.
15910 Declarator TheDeclarator(DS, DeclaratorContext::MemberContext);
15911 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S);
15912 QualType T = TSI->getType();
15913 if (TheDeclarator.isInvalidType())
15914 return nullptr;
15915
15916 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration))
15917 return nullptr;
15918
15919 // This is definitely an error in C++98. It's probably meant to
15920 // be forbidden in C++0x, too, but the specification is just
15921 // poorly written.
15922 //
15923 // The problem is with declarations like the following:
15924 // template <T> friend A<T>::foo;
15925 // where deciding whether a class C is a friend or not now hinges
15926 // on whether there exists an instantiation of A that causes
15927 // 'foo' to equal C. There are restrictions on class-heads
15928 // (which we declare (by fiat) elaborated friend declarations to
15929 // be) that makes this tractable.
15930 //
15931 // FIXME: handle "template <> friend class A<T>;", which
15932 // is possibly well-formed? Who even knows?
15933 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) {
15934 Diag(Loc, diag::err_tagless_friend_type_template)
15935 << DS.getSourceRange();
15936 return nullptr;
15937 }
15938
15939 // C++98 [class.friend]p1: A friend of a class is a function
15940 // or class that is not a member of the class . . .
15941 // This is fixed in DR77, which just barely didn't make the C++03
15942 // deadline. It's also a very silly restriction that seriously
15943 // affects inner classes and which nobody else seems to implement;
15944 // thus we never diagnose it, not even in -pedantic.
15945 //
15946 // But note that we could warn about it: it's always useless to
15947 // friend one of your own members (it's not, however, worthless to
15948 // friend a member of an arbitrary specialization of your template).
15949
15950 Decl *D;
15951 if (!TempParams.empty())
15952 D = FriendTemplateDecl::Create(Context, CurContext, Loc,
15953 TempParams,
15954 TSI,
15955 DS.getFriendSpecLoc());
15956 else
15957 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI);
15958
15959 if (!D)
15960 return nullptr;
15961
15962 D->setAccess(AS_public);
15963 CurContext->addDecl(D);
15964
15965 return D;
15966 }
15967
15968 NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D,
15969 MultiTemplateParamsArg TemplateParams) {
15970 const DeclSpec &DS = D.getDeclSpec();
15971
15972 assert(DS.isFriendSpecified());
15973 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
15974
15975 SourceLocation Loc = D.getIdentifierLoc();
15976 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
15977
15978 // C++ [class.friend]p1
15979 // A friend of a class is a function or class....
15980 // Note that this sees through typedefs, which is intended.
15981 // It *doesn't* see through dependent types, which is correct
15982 // according to [temp.arg.type]p3:
15983 // If a declaration acquires a function type through a
15984 // type dependent on a template-parameter and this causes
15985 // a declaration that does not use the syntactic form of a
15986 // function declarator to have a function type, the program
15987 // is ill-formed.
15988 if (!TInfo->getType()->isFunctionType()) {
15989 Diag(Loc, diag::err_unexpected_friend);
15990
15991 // It might be worthwhile to try to recover by creating an
15992 // appropriate declaration.
15993 return nullptr;
15994 }
15995
15996 // C++ [namespace.memdef]p3
15997 // - If a friend declaration in a non-local class first declares a
15998 // class or function, the friend class or function is a member
15999 // of the innermost enclosing namespace.
16000 // - The name of the friend is not found by simple name lookup
16001 // until a matching declaration is provided in that namespace
16002 // scope (either before or after the class declaration granting
16003 // friendship).
16004 // - If a friend function is called, its name may be found by the
16005 // name lookup that considers functions from namespaces and
16006 // classes associated with the types of the function arguments.
16007 // - When looking for a prior declaration of a class or a function
16008 // declared as a friend, scopes outside the innermost enclosing
16009 // namespace scope are not considered.
16010
16011 CXXScopeSpec &SS = D.getCXXScopeSpec();
16012 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
16013 assert(NameInfo.getName());
16014
16015 // Check for unexpanded parameter packs.
16016 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) ||
16017 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) ||
16018 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration))
16019 return nullptr;
16020
16021 // The context we found the declaration in, or in which we should
16022 // create the declaration.
16023 DeclContext *DC;
16024 Scope *DCScope = S;
16025 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
16026 ForExternalRedeclaration);
16027
16028 // There are five cases here.
16029 // - There's no scope specifier and we're in a local class. Only look
16030 // for functions declared in the immediately-enclosing block scope.
16031 // We recover from invalid scope qualifiers as if they just weren't there.
16032 FunctionDecl *FunctionContainingLocalClass = nullptr;
16033 if ((SS.isInvalid() || !SS.isSet()) &&
16034 (FunctionContainingLocalClass =
16035 cast<CXXRecordDecl>(CurContext)->isLocalClass())) {
16036 // C++11 [class.friend]p11:
16037 // If a friend declaration appears in a local class and the name
16038 // specified is an unqualified name, a prior declaration is
16039 // looked up without considering scopes that are outside the
16040 // innermost enclosing non-class scope. For a friend function
16041 // declaration, if there is no prior declaration, the program is
16042 // ill-formed.
16043
16044 // Find the innermost enclosing non-class scope. This is the block
16045 // scope containing the local class definition (or for a nested class,
16046 // the outer local class).
16047 DCScope = S->getFnParent();
16048
16049 // Look up the function name in the scope.
16050 Previous.clear(LookupLocalFriendName);
16051 LookupName(Previous, S, /*AllowBuiltinCreation*/false);
16052
16053 if (!Previous.empty()) {
16054 // All possible previous declarations must have the same context:
16055 // either they were declared at block scope or they are members of
16056 // one of the enclosing local classes.
16057 DC = Previous.getRepresentativeDecl()->getDeclContext();
16058 } else {
16059 // This is ill-formed, but provide the context that we would have
16060 // declared the function in, if we were permitted to, for error recovery.
16061 DC = FunctionContainingLocalClass;
16062 }
16063 adjustContextForLocalExternDecl(DC);
16064
16065 // C++ [class.friend]p6:
16066 // A function can be defined in a friend declaration of a class if and
16067 // only if the class is a non-local class (9.8), the function name is
16068 // unqualified, and the function has namespace scope.
16069 if (D.isFunctionDefinition()) {
16070 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class);
16071 }
16072
16073 // - There's no scope specifier, in which case we just go to the
16074 // appropriate scope and look for a function or function template
16075 // there as appropriate.
16076 } else if (SS.isInvalid() || !SS.isSet()) {
16077 // C++11 [namespace.memdef]p3:
16078 // If the name in a friend declaration is neither qualified nor
16079 // a template-id and the declaration is a function or an
16080 // elaborated-type-specifier, the lookup to determine whether
16081 // the entity has been previously declared shall not consider
16082 // any scopes outside the innermost enclosing namespace.
16083 bool isTemplateId =
16084 D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId;
16085
16086 // Find the appropriate context according to the above.
16087 DC = CurContext;
16088
16089 // Skip class contexts. If someone can cite chapter and verse
16090 // for this behavior, that would be nice --- it's what GCC and
16091 // EDG do, and it seems like a reasonable intent, but the spec
16092 // really only says that checks for unqualified existing
16093 // declarations should stop at the nearest enclosing namespace,
16094 // not that they should only consider the nearest enclosing
16095 // namespace.
16096 while (DC->isRecord())
16097 DC = DC->getParent();
16098
16099 DeclContext *LookupDC = DC;
16100 while (LookupDC->isTransparentContext())
16101 LookupDC = LookupDC->getParent();
16102
16103 while (true) {
16104 LookupQualifiedName(Previous, LookupDC);
16105
16106 if (!Previous.empty()) {
16107 DC = LookupDC;
16108 break;
16109 }
16110
16111 if (isTemplateId) {
16112 if (isa<TranslationUnitDecl>(LookupDC)) break;
16113 } else {
16114 if (LookupDC->isFileContext()) break;
16115 }
16116 LookupDC = LookupDC->getParent();
16117 }
16118
16119 DCScope = getScopeForDeclContext(S, DC);
16120
16121 // - There's a non-dependent scope specifier, in which case we
16122 // compute it and do a previous lookup there for a function
16123 // or function template.
16124 } else if (!SS.getScopeRep()->isDependent()) {
16125 DC = computeDeclContext(SS);
16126 if (!DC) return nullptr;
16127
16128 if (RequireCompleteDeclContext(SS, DC)) return nullptr;
16129
16130 LookupQualifiedName(Previous, DC);
16131
16132 // C++ [class.friend]p1: A friend of a class is a function or
16133 // class that is not a member of the class . . .
16134 if (DC->Equals(CurContext))
16135 Diag(DS.getFriendSpecLoc(),
16136 getLangOpts().CPlusPlus11 ?
16137 diag::warn_cxx98_compat_friend_is_member :
16138 diag::err_friend_is_member);
16139
16140 if (D.isFunctionDefinition()) {
16141 // C++ [class.friend]p6:
16142 // A function can be defined in a friend declaration of a class if and
16143 // only if the class is a non-local class (9.8), the function name is
16144 // unqualified, and the function has namespace scope.
16145 //
16146 // FIXME: We should only do this if the scope specifier names the
16147 // innermost enclosing namespace; otherwise the fixit changes the
16148 // meaning of the code.
16149 SemaDiagnosticBuilder DB
16150 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def);
16151
16152 DB << SS.getScopeRep();
16153 if (DC->isFileContext())
16154 DB << FixItHint::CreateRemoval(SS.getRange());
16155 SS.clear();
16156 }
16157
16158 // - There's a scope specifier that does not match any template
16159 // parameter lists, in which case we use some arbitrary context,
16160 // create a method or method template, and wait for instantiation.
16161 // - There's a scope specifier that does match some template
16162 // parameter lists, which we don't handle right now.
16163 } else {
16164 if (D.isFunctionDefinition()) {
16165 // C++ [class.friend]p6:
16166 // A function can be defined in a friend declaration of a class if and
16167 // only if the class is a non-local class (9.8), the function name is
16168 // unqualified, and the function has namespace scope.
16169 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def)
16170 << SS.getScopeRep();
16171 }
16172
16173 DC = CurContext;
16174 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?");
16175 }
16176
16177 if (!DC->isRecord()) {
16178 int DiagArg = -1;
16179 switch (D.getName().getKind()) {
16180 case UnqualifiedIdKind::IK_ConstructorTemplateId:
16181 case UnqualifiedIdKind::IK_ConstructorName:
16182 DiagArg = 0;
16183 break;
16184 case UnqualifiedIdKind::IK_DestructorName:
16185 DiagArg = 1;
16186 break;
16187 case UnqualifiedIdKind::IK_ConversionFunctionId:
16188 DiagArg = 2;
16189 break;
16190 case UnqualifiedIdKind::IK_DeductionGuideName:
16191 DiagArg = 3;
16192 break;
16193 case UnqualifiedIdKind::IK_Identifier:
16194 case UnqualifiedIdKind::IK_ImplicitSelfParam:
16195 case UnqualifiedIdKind::IK_LiteralOperatorId:
16196 case UnqualifiedIdKind::IK_OperatorFunctionId:
16197 case UnqualifiedIdKind::IK_TemplateId:
16198 break;
16199 }
16200 // This implies that it has to be an operator or function.
16201 if (DiagArg >= 0) {
16202 Diag(Loc, diag::err_introducing_special_friend) << DiagArg;
16203 return nullptr;
16204 }
16205 }
16206
16207 // FIXME: This is an egregious hack to cope with cases where the scope stack
16208 // does not contain the declaration context, i.e., in an out-of-line
16209 // definition of a class.
16210 Scope FakeDCScope(S, Scope::DeclScope, Diags);
16211 if (!DCScope) {
16212 FakeDCScope.setEntity(DC);
16213 DCScope = &FakeDCScope;
16214 }
16215
16216 bool AddToScope = true;
16217 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous,
16218 TemplateParams, AddToScope);
16219 if (!ND) return nullptr;
16220
16221 assert(ND->getLexicalDeclContext() == CurContext);
16222
16223 // If we performed typo correction, we might have added a scope specifier
16224 // and changed the decl context.
16225 DC = ND->getDeclContext();
16226
16227 // Add the function declaration to the appropriate lookup tables,
16228 // adjusting the redeclarations list as necessary. We don't
16229 // want to do this yet if the friending class is dependent.
16230 //
16231 // Also update the scope-based lookup if the target context's
16232 // lookup context is in lexical scope.
16233 if (!CurContext->isDependentContext()) {
16234 DC = DC->getRedeclContext();
16235 DC->makeDeclVisibleInContext(ND);
16236 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
16237 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false);
16238 }
16239
16240 FriendDecl *FrD = FriendDecl::Create(Context, CurContext,
16241 D.getIdentifierLoc(), ND,
16242 DS.getFriendSpecLoc());
16243 FrD->setAccess(AS_public);
16244 CurContext->addDecl(FrD);
16245
16246 if (ND->isInvalidDecl()) {
16247 FrD->setInvalidDecl();
16248 } else {
16249 if (DC->isRecord()) CheckFriendAccess(ND);
16250
16251 FunctionDecl *FD;
16252 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND))
16253 FD = FTD->getTemplatedDecl();
16254 else
16255 FD = cast<FunctionDecl>(ND);
16256
16257 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a
16258 // default argument expression, that declaration shall be a definition
16259 // and shall be the only declaration of the function or function
16260 // template in the translation unit.
16261 if (functionDeclHasDefaultArgument(FD)) {
16262 // We can't look at FD->getPreviousDecl() because it may not have been set
16263 // if we're in a dependent context. If the function is known to be a
16264 // redeclaration, we will have narrowed Previous down to the right decl.
16265 if (D.isRedeclaration()) {
16266 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_redeclared);
16267 Diag(Previous.getRepresentativeDecl()->getLocation(),
16268 diag::note_previous_declaration);
16269 } else if (!D.isFunctionDefinition())
16270 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_must_be_def);
16271 }
16272
16273 // Mark templated-scope function declarations as unsupported.
16274 if (FD->getNumTemplateParameterLists() && SS.isValid()) {
16275 Diag(FD->getLocation(), diag::warn_template_qualified_friend_unsupported)
16276 << SS.getScopeRep() << SS.getRange()
16277 << cast<CXXRecordDecl>(CurContext);
16278 FrD->setUnsupportedFriend(true);
16279 }
16280 }
16281
16282 return ND;
16283 }
16284
16285 void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) {
16286 AdjustDeclIfTemplate(Dcl);
16287
16288 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl);
16289 if (!Fn) {
16290 Diag(DelLoc, diag::err_deleted_non_function);
16291 return;
16292 }
16293
16294 // Deleted function does not have a body.
16295 Fn->setWillHaveBody(false);
16296
16297 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) {
16298 // Don't consider the implicit declaration we generate for explicit
16299 // specializations. FIXME: Do not generate these implicit declarations.
16300 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization ||
16301 Prev->getPreviousDecl()) &&
16302 !Prev->isDefined()) {
16303 Diag(DelLoc, diag::err_deleted_decl_not_first);
16304 Diag(Prev->getLocation().isInvalid() ? DelLoc : Prev->getLocation(),
16305 Prev->isImplicit() ? diag::note_previous_implicit_declaration
16306 : diag::note_previous_declaration);
16307 }
16308 // If the declaration wasn't the first, we delete the function anyway for
16309 // recovery.
16310 Fn = Fn->getCanonicalDecl();
16311 }
16312
16313 // dllimport/dllexport cannot be deleted.
16314 if (const InheritableAttr *DLLAttr = getDLLAttr(Fn)) {
16315 Diag(Fn->getLocation(), diag::err_attribute_dll_deleted) << DLLAttr;
16316 Fn->setInvalidDecl();
16317 }
16318
16319 if (Fn->isDeleted())
16320 return;
16321
16322 // C++11 [basic.start.main]p3:
16323 // A program that defines main as deleted [...] is ill-formed.
16324 if (Fn->isMain())
16325 Diag(DelLoc, diag::err_deleted_main);
16326
16327 // C++11 [dcl.fct.def.delete]p4:
16328 // A deleted function is implicitly inline.
16329 Fn->setImplicitlyInline();
16330 Fn->setDeletedAsWritten();
16331
16332 // See if we're deleting a function which is already known to override a
16333 // non-deleted virtual function.
16334 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) {
16335 bool IssuedDiagnostic = false;
16336 for (const CXXMethodDecl *O : MD->overridden_methods()) {
16337 if (!(*MD->begin_overridden_methods())->isDeleted()) {
16338 if (!IssuedDiagnostic) {
16339 Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName();
16340 IssuedDiagnostic = true;
16341 }
16342 Diag(O->getLocation(), diag::note_overridden_virtual_function);
16343 }
16344 }
16345 // If this function was implicitly deleted because it was defaulted,
16346 // explain why it was deleted.
16347 if (IssuedDiagnostic && MD->isDefaulted())
16348 DiagnoseDeletedDefaultedFunction(MD);
16349 }
16350 }
16351
16352 void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) {
16353 if (!Dcl || Dcl->isInvalidDecl())
16354 return;
16355
16356 auto *FD = dyn_cast<FunctionDecl>(Dcl);
16357 if (!FD) {
16358 if (auto *FTD = dyn_cast<FunctionTemplateDecl>(Dcl)) {
16359 if (getDefaultedFunctionKind(FTD->getTemplatedDecl()).isComparison()) {
16360 Diag(DefaultLoc, diag::err_defaulted_comparison_template);
16361 return;
16362 }
16363 }
16364
16365 Diag(DefaultLoc, diag::err_default_special_members)
16366 << getLangOpts().CPlusPlus2a;
16367 return;
16368 }
16369
16370 // Reject if this can't possibly be a defaultable function.
16371 DefaultedFunctionKind DefKind = getDefaultedFunctionKind(FD);
16372 if (!DefKind &&
16373 // A dependent function that doesn't locally look defaultable can
16374 // still instantiate to a defaultable function if it's a constructor
16375 // or assignment operator.
16376 (!FD->isDependentContext() ||
16377 (!isa<CXXConstructorDecl>(FD) &&
16378 FD->getDeclName().getCXXOverloadedOperator() != OO_Equal))) {
16379 Diag(DefaultLoc, diag::err_default_special_members)
16380 << getLangOpts().CPlusPlus2a;
16381 return;
16382 }
16383
16384 if (DefKind.isComparison() &&
16385 !isa<CXXRecordDecl>(FD->getLexicalDeclContext())) {
16386 Diag(FD->getLocation(), diag::err_defaulted_comparison_out_of_class)
16387 << (int)DefKind.asComparison();
16388 return;
16389 }
16390
16391 // Issue compatibility warning. We already warned if the operator is
16392 // 'operator<=>' when parsing the '<=>' token.
16393 if (DefKind.isComparison() &&
16394 DefKind.asComparison() != DefaultedComparisonKind::ThreeWay) {
16395 Diag(DefaultLoc, getLangOpts().CPlusPlus2a
16396 ? diag::warn_cxx17_compat_defaulted_comparison
16397 : diag::ext_defaulted_comparison);
16398 }
16399
16400 FD->setDefaulted();
16401 FD->setExplicitlyDefaulted();
16402
16403 // Defer checking functions that are defaulted in a dependent context.
16404 if (FD->isDependentContext())
16405 return;
16406
16407 // Unset that we will have a body for this function. We might not,
16408 // if it turns out to be trivial, and we don't need this marking now
16409 // that we've marked it as defaulted.
16410 FD->setWillHaveBody(false);
16411
16412 // If this definition appears within the record, do the checking when
16413 // the record is complete. This is always the case for a defaulted
16414 // comparison.
16415 if (DefKind.isComparison())
16416 return;
16417 auto *MD = cast<CXXMethodDecl>(FD);
16418
16419 const FunctionDecl *Primary = FD;
16420 if (const FunctionDecl *Pattern = FD->getTemplateInstantiationPattern())
16421 // Ask the template instantiation pattern that actually had the
16422 // '= default' on it.
16423 Primary = Pattern;
16424
16425 // If the method was defaulted on its first declaration, we will have
16426 // already performed the checking in CheckCompletedCXXClass. Such a
16427 // declaration doesn't trigger an implicit definition.
16428 if (Primary->getCanonicalDecl()->isDefaulted())
16429 return;
16430
16431 if (CheckExplicitlyDefaultedSpecialMember(MD, DefKind.asSpecialMember()))
16432 MD->setInvalidDecl();
16433 else
16434 DefineImplicitSpecialMember(*this, MD, DefaultLoc);
16435 }
16436
16437 static void SearchForReturnInStmt(Sema &Self, Stmt *S) {
16438 for (Stmt *SubStmt : S->children()) {
16439 if (!SubStmt)
16440 continue;
16441 if (isa<ReturnStmt>(SubStmt))
16442 Self.Diag(SubStmt->getBeginLoc(),
16443 diag::err_return_in_constructor_handler);
16444 if (!isa<Expr>(SubStmt))
16445 SearchForReturnInStmt(Self, SubStmt);
16446 }
16447 }
16448
16449 void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) {
16450 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) {
16451 CXXCatchStmt *Handler = TryBlock->getHandler(I);
16452 SearchForReturnInStmt(*this, Handler);
16453 }
16454 }
16455
16456 bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New,
16457 const CXXMethodDecl *Old) {
16458 const auto *NewFT = New->getType()->castAs<FunctionProtoType>();
16459 const auto *OldFT = Old->getType()->castAs<FunctionProtoType>();
16460
16461 if (OldFT->hasExtParameterInfos()) {
16462 for (unsigned I = 0, E = OldFT->getNumParams(); I != E; ++I)
16463 // A parameter of the overriding method should be annotated with noescape
16464 // if the corresponding parameter of the overridden method is annotated.
16465 if (OldFT->getExtParameterInfo(I).isNoEscape() &&
16466 !NewFT->getExtParameterInfo(I).isNoEscape()) {
16467 Diag(New->getParamDecl(I)->getLocation(),
16468 diag::warn_overriding_method_missing_noescape);
16469 Diag(Old->getParamDecl(I)->getLocation(),
16470 diag::note_overridden_marked_noescape);
16471 }
16472 }
16473
16474 // Virtual overrides must have the same code_seg.
16475 const auto *OldCSA = Old->getAttr<CodeSegAttr>();
16476 const auto *NewCSA = New->getAttr<CodeSegAttr>();
16477 if ((NewCSA || OldCSA) &&
16478 (!OldCSA || !NewCSA || NewCSA->getName() != OldCSA->getName())) {
16479 Diag(New->getLocation(), diag::err_mismatched_code_seg_override);
16480 Diag(Old->getLocation(), diag::note_previous_declaration);
16481 return true;
16482 }
16483
16484 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv();
16485
16486 // If the calling conventions match, everything is fine
16487 if (NewCC == OldCC)
16488 return false;
16489
16490 // If the calling conventions mismatch because the new function is static,
16491 // suppress the calling convention mismatch error; the error about static
16492 // function override (err_static_overrides_virtual from
16493 // Sema::CheckFunctionDeclaration) is more clear.
16494 if (New->getStorageClass() == SC_Static)
16495 return false;
16496
16497 Diag(New->getLocation(),
16498 diag::err_conflicting_overriding_cc_attributes)
16499 << New->getDeclName() << New->getType() << Old->getType();
16500 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
16501 return true;
16502 }
16503
16504 bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New,
16505 const CXXMethodDecl *Old) {
16506 QualType NewTy = New->getType()->castAs<FunctionType>()->getReturnType();
16507 QualType OldTy = Old->getType()->castAs<FunctionType>()->getReturnType();
16508
16509 if (Context.hasSameType(NewTy, OldTy) ||
16510 NewTy->isDependentType() || OldTy->isDependentType())
16511 return false;
16512
16513 // Check if the return types are covariant
16514 QualType NewClassTy, OldClassTy;
16515
16516 /// Both types must be pointers or references to classes.
16517 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) {
16518 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) {
16519 NewClassTy = NewPT->getPointeeType();
16520 OldClassTy = OldPT->getPointeeType();
16521 }
16522 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) {
16523 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) {
16524 if (NewRT->getTypeClass() == OldRT->getTypeClass()) {
16525 NewClassTy = NewRT->getPointeeType();
16526 OldClassTy = OldRT->getPointeeType();
16527 }
16528 }
16529 }
16530
16531 // The return types aren't either both pointers or references to a class type.
16532 if (NewClassTy.isNull()) {
16533 Diag(New->getLocation(),
16534 diag::err_different_return_type_for_overriding_virtual_function)
16535 << New->getDeclName() << NewTy << OldTy
16536 << New->getReturnTypeSourceRange();
16537 Diag(Old->getLocation(), diag::note_overridden_virtual_function)
16538 << Old->getReturnTypeSourceRange();
16539
16540 return true;
16541 }
16542
16543 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) {
16544 // C++14 [class.virtual]p8:
16545 // If the class type in the covariant return type of D::f differs from
16546 // that of B::f, the class type in the return type of D::f shall be
16547 // complete at the point of declaration of D::f or shall be the class
16548 // type D.
16549 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) {
16550 if (!RT->isBeingDefined() &&
16551 RequireCompleteType(New->getLocation(), NewClassTy,
16552 diag::err_covariant_return_incomplete,
16553 New->getDeclName()))
16554 return true;
16555 }
16556
16557 // Check if the new class derives from the old class.
16558 if (!IsDerivedFrom(New->getLocation(), NewClassTy, OldClassTy)) {
16559 Diag(New->getLocation(), diag::err_covariant_return_not_derived)
16560 << New->getDeclName() << NewTy << OldTy
16561 << New->getReturnTypeSourceRange();
16562 Diag(Old->getLocation(), diag::note_overridden_virtual_function)
16563 << Old->getReturnTypeSourceRange();
16564 return true;
16565 }
16566
16567 // Check if we the conversion from derived to base is valid.
16568 if (CheckDerivedToBaseConversion(
16569 NewClassTy, OldClassTy,
16570 diag::err_covariant_return_inaccessible_base,
16571 diag::err_covariant_return_ambiguous_derived_to_base_conv,
16572 New->getLocation(), New->getReturnTypeSourceRange(),
16573 New->getDeclName(), nullptr)) {
16574 // FIXME: this note won't trigger for delayed access control
16575 // diagnostics, and it's impossible to get an undelayed error
16576 // here from access control during the original parse because
16577 // the ParsingDeclSpec/ParsingDeclarator are still in scope.
16578 Diag(Old->getLocation(), diag::note_overridden_virtual_function)
16579 << Old->getReturnTypeSourceRange();
16580 return true;
16581 }
16582 }
16583
16584 // The qualifiers of the return types must be the same.
16585 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) {
16586 Diag(New->getLocation(),
16587 diag::err_covariant_return_type_different_qualifications)
16588 << New->getDeclName() << NewTy << OldTy
16589 << New->getReturnTypeSourceRange();
16590 Diag(Old->getLocation(), diag::note_overridden_virtual_function)
16591 << Old->getReturnTypeSourceRange();
16592 return true;
16593 }
16594
16595
16596 // The new class type must have the same or less qualifiers as the old type.
16597 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) {
16598 Diag(New->getLocation(),
16599 diag::err_covariant_return_type_class_type_more_qualified)
16600 << New->getDeclName() << NewTy << OldTy
16601 << New->getReturnTypeSourceRange();
16602 Diag(Old->getLocation(), diag::note_overridden_virtual_function)
16603 << Old->getReturnTypeSourceRange();
16604 return true;
16605 }
16606
16607 return false;
16608 }
16609
16610 /// Mark the given method pure.
16611 ///
16612 /// \param Method the method to be marked pure.
16613 ///
16614 /// \param InitRange the source range that covers the "0" initializer.
16615 bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) {
16616 SourceLocation EndLoc = InitRange.getEnd();
16617 if (EndLoc.isValid())
16618 Method->setRangeEnd(EndLoc);
16619
16620 if (Method->isVirtual() || Method->getParent()->isDependentContext()) {
16621 Method->setPure();
16622 return false;
16623 }
16624
16625 if (!Method->isInvalidDecl())
16626 Diag(Method->getLocation(), diag::err_non_virtual_pure)
16627 << Method->getDeclName() << InitRange;
16628 return true;
16629 }
16630
16631 void Sema::ActOnPureSpecifier(Decl *D, SourceLocation ZeroLoc) {
16632 if (D->getFriendObjectKind())
16633 Diag(D->getLocation(), diag::err_pure_friend);
16634 else if (auto *M = dyn_cast<CXXMethodDecl>(D))
16635 CheckPureMethod(M, ZeroLoc);
16636 else
16637 Diag(D->getLocation(), diag::err_illegal_initializer);
16638 }
16639
16640 /// Determine whether the given declaration is a global variable or
16641 /// static data member.
16642 static bool isNonlocalVariable(const Decl *D) {
16643 if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(D))
16644 return Var->hasGlobalStorage();
16645
16646 return false;
16647 }
16648
16649 /// Invoked when we are about to parse an initializer for the declaration
16650 /// 'Dcl'.
16651 ///
16652 /// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a
16653 /// static data member of class X, names should be looked up in the scope of
16654 /// class X. If the declaration had a scope specifier, a scope will have
16655 /// been created and passed in for this purpose. Otherwise, S will be null.
16656 void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) {
16657 // If there is no declaration, there was an error parsing it.
16658 if (!D || D->isInvalidDecl())
16659 return;
16660
16661 // We will always have a nested name specifier here, but this declaration
16662 // might not be out of line if the specifier names the current namespace:
16663 // extern int n;
16664 // int ::n = 0;
16665 if (S && D->isOutOfLine())
16666 EnterDeclaratorContext(S, D->getDeclContext());
16667
16668 // If we are parsing the initializer for a static data member, push a
16669 // new expression evaluation context that is associated with this static
16670 // data member.
16671 if (isNonlocalVariable(D))
16672 PushExpressionEvaluationContext(
16673 ExpressionEvaluationContext::PotentiallyEvaluated, D);
16674 }
16675
16676 /// Invoked after we are finished parsing an initializer for the declaration D.
16677 void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) {
16678 // If there is no declaration, there was an error parsing it.
16679 if (!D || D->isInvalidDecl())
16680 return;
16681
16682 if (isNonlocalVariable(D))
16683 PopExpressionEvaluationContext();
16684
16685 if (S && D->isOutOfLine())
16686 ExitDeclaratorContext(S);
16687 }
16688
16689 /// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a
16690 /// C++ if/switch/while/for statement.
16691 /// e.g: "if (int x = f()) {...}"
16692 DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) {
16693 // C++ 6.4p2:
16694 // The declarator shall not specify a function or an array.
16695 // The type-specifier-seq shall not contain typedef and shall not declare a
16696 // new class or enumeration.
16697 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
16698 "Parser allowed 'typedef' as storage class of condition decl.");
16699
16700 Decl *Dcl = ActOnDeclarator(S, D);
16701 if (!Dcl)
16702 return true;
16703
16704 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function.
16705 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type)
16706 << D.getSourceRange();
16707 return true;
16708 }
16709
16710 return Dcl;
16711 }
16712
16713 void Sema::LoadExternalVTableUses() {
16714 if (!ExternalSource)
16715 return;
16716
16717 SmallVector<ExternalVTableUse, 4> VTables;
16718 ExternalSource->ReadUsedVTables(VTables);
16719 SmallVector<VTableUse, 4> NewUses;
16720 for (unsigned I = 0, N = VTables.size(); I != N; ++I) {
16721 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos
16722 = VTablesUsed.find(VTables[I].Record);
16723 // Even if a definition wasn't required before, it may be required now.
16724 if (Pos != VTablesUsed.end()) {
16725 if (!Pos->second && VTables[I].DefinitionRequired)
16726 Pos->second = true;
16727 continue;
16728 }
16729
16730 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired;
16731 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location));
16732 }
16733
16734 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end());
16735 }
16736
16737 void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class,
16738 bool DefinitionRequired) {
16739 // Ignore any vtable uses in unevaluated operands or for classes that do
16740 // not have a vtable.
16741 if (!Class->isDynamicClass() || Class->isDependentContext() ||
16742 CurContext->isDependentContext() || isUnevaluatedContext())
16743 return;
16744 // Do not mark as used if compiling for the device outside of the target
16745 // region.
16746 if (LangOpts.OpenMP && LangOpts.OpenMPIsDevice &&
16747 !isInOpenMPDeclareTargetContext() &&
16748 !isInOpenMPTargetExecutionDirective()) {
16749 if (!DefinitionRequired)
16750 MarkVirtualMembersReferenced(Loc, Class);
16751 return;
16752 }
16753
16754 // Try to insert this class into the map.
16755 LoadExternalVTableUses();
16756 Class = Class->getCanonicalDecl();
16757 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool>
16758 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired));
16759 if (!Pos.second) {
16760 // If we already had an entry, check to see if we are promoting this vtable
16761 // to require a definition. If so, we need to reappend to the VTableUses
16762 // list, since we may have already processed the first entry.
16763 if (DefinitionRequired && !Pos.first->second) {
16764 Pos.first->second = true;
16765 } else {
16766 // Otherwise, we can early exit.
16767 return;
16768 }
16769 } else {
16770 // The Microsoft ABI requires that we perform the destructor body
16771 // checks (i.e. operator delete() lookup) when the vtable is marked used, as
16772 // the deleting destructor is emitted with the vtable, not with the
16773 // destructor definition as in the Itanium ABI.
16774 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
16775 CXXDestructorDecl *DD = Class->getDestructor();
16776 if (DD && DD->isVirtual() && !DD->isDeleted()) {
16777 if (Class->hasUserDeclaredDestructor() && !DD->isDefined()) {
16778 // If this is an out-of-line declaration, marking it referenced will
16779 // not do anything. Manually call CheckDestructor to look up operator
16780 // delete().
16781 ContextRAII SavedContext(*this, DD);
16782 CheckDestructor(DD);
16783 } else {
16784 MarkFunctionReferenced(Loc, Class->getDestructor());
16785 }
16786 }
16787 }
16788 }
16789
16790 // Local classes need to have their virtual members marked
16791 // immediately. For all other classes, we mark their virtual members
16792 // at the end of the translation unit.
16793 if (Class->isLocalClass())
16794 MarkVirtualMembersReferenced(Loc, Class);
16795 else
16796 VTableUses.push_back(std::make_pair(Class, Loc));
16797 }
16798
16799 bool Sema::DefineUsedVTables() {
16800 LoadExternalVTableUses();
16801 if (VTableUses.empty())
16802 return false;
16803
16804 // Note: The VTableUses vector could grow as a result of marking
16805 // the members of a class as "used", so we check the size each
16806 // time through the loop and prefer indices (which are stable) to
16807 // iterators (which are not).
16808 bool DefinedAnything = false;
16809 for (unsigned I = 0; I != VTableUses.size(); ++I) {
16810 CXXRecordDecl *Class = VTableUses[I].first->getDefinition();
16811 if (!Class)
16812 continue;
16813 TemplateSpecializationKind ClassTSK =
16814 Class->getTemplateSpecializationKind();
16815
16816 SourceLocation Loc = VTableUses[I].second;
16817
16818 bool DefineVTable = true;
16819
16820 // If this class has a key function, but that key function is
16821 // defined in another translation unit, we don't need to emit the
16822 // vtable even though we're using it.
16823 const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class);
16824 if (KeyFunction && !KeyFunction->hasBody()) {
16825 // The key function is in another translation unit.
16826 DefineVTable = false;
16827 TemplateSpecializationKind TSK =
16828 KeyFunction->getTemplateSpecializationKind();
16829 assert(TSK != TSK_ExplicitInstantiationDefinition &&
16830 TSK != TSK_ImplicitInstantiation &&
16831 "Instantiations don't have key functions");
16832 (void)TSK;
16833 } else if (!KeyFunction) {
16834 // If we have a class with no key function that is the subject
16835 // of an explicit instantiation declaration, suppress the
16836 // vtable; it will live with the explicit instantiation
16837 // definition.
16838 bool IsExplicitInstantiationDeclaration =
16839 ClassTSK == TSK_ExplicitInstantiationDeclaration;
16840 for (auto R : Class->redecls()) {
16841 TemplateSpecializationKind TSK
16842 = cast<CXXRecordDecl>(R)->getTemplateSpecializationKind();
16843 if (TSK == TSK_ExplicitInstantiationDeclaration)
16844 IsExplicitInstantiationDeclaration = true;
16845 else if (TSK == TSK_ExplicitInstantiationDefinition) {
16846 IsExplicitInstantiationDeclaration = false;
16847 break;
16848 }
16849 }
16850
16851 if (IsExplicitInstantiationDeclaration)
16852 DefineVTable = false;
16853 }
16854
16855 // The exception specifications for all virtual members may be needed even
16856 // if we are not providing an authoritative form of the vtable in this TU.
16857 // We may choose to emit it available_externally anyway.
16858 if (!DefineVTable) {
16859 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class);
16860 continue;
16861 }
16862
16863 // Mark all of the virtual members of this class as referenced, so
16864 // that we can build a vtable. Then, tell the AST consumer that a
16865 // vtable for this class is required.
16866 DefinedAnything = true;
16867 MarkVirtualMembersReferenced(Loc, Class);
16868 CXXRecordDecl *Canonical = Class->getCanonicalDecl();
16869 if (VTablesUsed[Canonical])
16870 Consumer.HandleVTable(Class);
16871
16872 // Warn if we're emitting a weak vtable. The vtable will be weak if there is
16873 // no key function or the key function is inlined. Don't warn in C++ ABIs
16874 // that lack key functions, since the user won't be able to make one.
16875 if (Context.getTargetInfo().getCXXABI().hasKeyFunctions() &&
16876 Class->isExternallyVisible() && ClassTSK != TSK_ImplicitInstantiation) {
16877 const FunctionDecl *KeyFunctionDef = nullptr;
16878 if (!KeyFunction || (KeyFunction->hasBody(KeyFunctionDef) &&
16879 KeyFunctionDef->isInlined())) {
16880 Diag(Class->getLocation(),
16881 ClassTSK == TSK_ExplicitInstantiationDefinition
16882 ? diag::warn_weak_template_vtable
16883 : diag::warn_weak_vtable)
16884 << Class;
16885 }
16886 }
16887 }
16888 VTableUses.clear();
16889
16890 return DefinedAnything;
16891 }
16892
16893 void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc,
16894 const CXXRecordDecl *RD) {
16895 for (const auto *I : RD->methods())
16896 if (I->isVirtual() && !I->isPure())
16897 ResolveExceptionSpec(Loc, I->getType()->castAs<FunctionProtoType>());
16898 }
16899
16900 void Sema::MarkVirtualMembersReferenced(SourceLocation Loc,
16901 const CXXRecordDecl *RD,
16902 bool ConstexprOnly) {
16903 // Mark all functions which will appear in RD's vtable as used.
16904 CXXFinalOverriderMap FinalOverriders;
16905 RD->getFinalOverriders(FinalOverriders);
16906 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(),
16907 E = FinalOverriders.end();
16908 I != E; ++I) {
16909 for (OverridingMethods::const_iterator OI = I->second.begin(),
16910 OE = I->second.end();
16911 OI != OE; ++OI) {
16912 assert(OI->second.size() > 0 && "no final overrider");
16913 CXXMethodDecl *Overrider = OI->second.front().Method;
16914
16915 // C++ [basic.def.odr]p2:
16916 // [...] A virtual member function is used if it is not pure. [...]
16917 if (!Overrider->isPure() && (!ConstexprOnly || Overrider->isConstexpr()))
16918 MarkFunctionReferenced(Loc, Overrider);
16919 }
16920 }
16921
16922 // Only classes that have virtual bases need a VTT.
16923 if (RD->getNumVBases() == 0)
16924 return;
16925
16926 for (const auto &I : RD->bases()) {
16927 const auto *Base =
16928 cast<CXXRecordDecl>(I.getType()->castAs<RecordType>()->getDecl());
16929 if (Base->getNumVBases() == 0)
16930 continue;
16931 MarkVirtualMembersReferenced(Loc, Base);
16932 }
16933 }
16934
16935 /// SetIvarInitializers - This routine builds initialization ASTs for the
16936 /// Objective-C implementation whose ivars need be initialized.
16937 void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) {
16938 if (!getLangOpts().CPlusPlus)
16939 return;
16940 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) {
16941 SmallVector<ObjCIvarDecl*, 8> ivars;
16942 CollectIvarsToConstructOrDestruct(OID, ivars);
16943 if (ivars.empty())
16944 return;
16945 SmallVector<CXXCtorInitializer*, 32> AllToInit;
16946 for (unsigned i = 0; i < ivars.size(); i++) {
16947 FieldDecl *Field = ivars[i];
16948 if (Field->isInvalidDecl())
16949 continue;
16950
16951 CXXCtorInitializer *Member;
16952 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field);
16953 InitializationKind InitKind =
16954 InitializationKind::CreateDefault(ObjCImplementation->getLocation());
16955
16956 InitializationSequence InitSeq(*this, InitEntity, InitKind, None);
16957 ExprResult MemberInit =
16958 InitSeq.Perform(*this, InitEntity, InitKind, None);
16959 MemberInit = MaybeCreateExprWithCleanups(MemberInit);
16960 // Note, MemberInit could actually come back empty if no initialization
16961 // is required (e.g., because it would call a trivial default constructor)
16962 if (!MemberInit.get() || MemberInit.isInvalid())
16963 continue;
16964
16965 Member =
16966 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(),
16967 SourceLocation(),
16968 MemberInit.getAs<Expr>(),
16969 SourceLocation());
16970 AllToInit.push_back(Member);
16971
16972 // Be sure that the destructor is accessible and is marked as referenced.
16973 if (const RecordType *RecordTy =
16974 Context.getBaseElementType(Field->getType())
16975 ->getAs<RecordType>()) {
16976 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl());
16977 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) {
16978 MarkFunctionReferenced(Field->getLocation(), Destructor);
16979 CheckDestructorAccess(Field->getLocation(), Destructor,
16980 PDiag(diag::err_access_dtor_ivar)
16981 << Context.getBaseElementType(Field->getType()));
16982 }
16983 }
16984 }
16985 ObjCImplementation->setIvarInitializers(Context,
16986 AllToInit.data(), AllToInit.size());
16987 }
16988 }
16989
16990 static
16991 void DelegatingCycleHelper(CXXConstructorDecl* Ctor,
16992 llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Valid,
16993 llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Invalid,
16994 llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Current,
16995 Sema &S) {
16996 if (Ctor->isInvalidDecl())
16997 return;
16998
16999 CXXConstructorDecl *Target = Ctor->getTargetConstructor();
17000
17001 // Target may not be determinable yet, for instance if this is a dependent
17002 // call in an uninstantiated template.
17003 if (Target) {
17004 const FunctionDecl *FNTarget = nullptr;
17005 (void)Target->hasBody(FNTarget);
17006 Target = const_cast<CXXConstructorDecl*>(
17007 cast_or_null<CXXConstructorDecl>(FNTarget));
17008 }
17009
17010 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(),
17011 // Avoid dereferencing a null pointer here.
17012 *TCanonical = Target? Target->getCanonicalDecl() : nullptr;
17013
17014 if (!Current.insert(Canonical).second)
17015 return;
17016
17017 // We know that beyond here, we aren't chaining into a cycle.
17018 if (!Target || !Target->isDelegatingConstructor() ||
17019 Target->isInvalidDecl() || Valid.count(TCanonical)) {
17020 Valid.insert(Current.begin(), Current.end());
17021 Current.clear();
17022 // We've hit a cycle.
17023 } else if (TCanonical == Canonical || Invalid.count(TCanonical) ||
17024 Current.count(TCanonical)) {
17025 // If we haven't diagnosed this cycle yet, do so now.
17026 if (!Invalid.count(TCanonical)) {
17027 S.Diag((*Ctor->init_begin())->getSourceLocation(),
17028 diag::warn_delegating_ctor_cycle)
17029 << Ctor;
17030
17031 // Don't add a note for a function delegating directly to itself.
17032 if (TCanonical != Canonical)
17033 S.Diag(Target->getLocation(), diag::note_it_delegates_to);
17034
17035 CXXConstructorDecl *C = Target;
17036 while (C->getCanonicalDecl() != Canonical) {
17037 const FunctionDecl *FNTarget = nullptr;
17038 (void)C->getTargetConstructor()->hasBody(FNTarget);
17039 assert(FNTarget && "Ctor cycle through bodiless function");
17040
17041 C = const_cast<CXXConstructorDecl*>(
17042 cast<CXXConstructorDecl>(FNTarget));
17043 S.Diag(C->getLocation(), diag::note_which_delegates_to);
17044 }
17045 }
17046
17047 Invalid.insert(Current.begin(), Current.end());
17048 Current.clear();
17049 } else {
17050 DelegatingCycleHelper(Target, Valid, Invalid, Current, S);
17051 }
17052 }
17053
17054
17055 void Sema::CheckDelegatingCtorCycles() {
17056 llvm::SmallPtrSet<CXXConstructorDecl*, 4> Valid, Invalid, Current;
17057
17058 for (DelegatingCtorDeclsType::iterator
17059 I = DelegatingCtorDecls.begin(ExternalSource),
17060 E = DelegatingCtorDecls.end();
17061 I != E; ++I)
17062 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this);
17063
17064 for (auto CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI)
17065 (*CI)->setInvalidDecl();
17066 }
17067
17068 namespace {
17069 /// AST visitor that finds references to the 'this' expression.
17070 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> {
17071 Sema &S;
17072
17073 public:
17074 explicit FindCXXThisExpr(Sema &S) : S(S) { }
17075
17076 bool VisitCXXThisExpr(CXXThisExpr *E) {
17077 S.Diag(E->getLocation(), diag::err_this_static_member_func)
17078 << E->isImplicit();
17079 return false;
17080 }
17081 };
17082 }
17083
17084 bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) {
17085 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo();
17086 if (!TSInfo)
17087 return false;
17088
17089 TypeLoc TL = TSInfo->getTypeLoc();
17090 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>();
17091 if (!ProtoTL)
17092 return false;
17093
17094 // C++11 [expr.prim.general]p3:
17095 // [The expression this] shall not appear before the optional
17096 // cv-qualifier-seq and it shall not appear within the declaration of a
17097 // static member function (although its type and value category are defined
17098 // within a static member function as they are within a non-static member
17099 // function). [ Note: this is because declaration matching does not occur
17100 // until the complete declarator is known. - end note ]
17101 const FunctionProtoType *Proto = ProtoTL.getTypePtr();
17102 FindCXXThisExpr Finder(*this);
17103
17104 // If the return type came after the cv-qualifier-seq, check it now.
17105 if (Proto->hasTrailingReturn() &&
17106 !Finder.TraverseTypeLoc(ProtoTL.getReturnLoc()))
17107 return true;
17108
17109 // Check the exception specification.
17110 if (checkThisInStaticMemberFunctionExceptionSpec(Method))
17111 return true;
17112
17113 // Check the trailing requires clause
17114 if (Expr *E = Method->getTrailingRequiresClause())
17115 if (!Finder.TraverseStmt(E))
17116 return true;
17117
17118 return checkThisInStaticMemberFunctionAttributes(Method);
17119 }
17120
17121 bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) {
17122 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo();
17123 if (!TSInfo)
17124 return false;
17125
17126 TypeLoc TL = TSInfo->getTypeLoc();
17127 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>();
17128 if (!ProtoTL)
17129 return false;
17130
17131 const FunctionProtoType *Proto = ProtoTL.getTypePtr();
17132 FindCXXThisExpr Finder(*this);
17133
17134 switch (Proto->getExceptionSpecType()) {
17135 case EST_Unparsed:
17136 case EST_Uninstantiated:
17137 case EST_Unevaluated:
17138 case EST_BasicNoexcept:
17139 case EST_NoThrow:
17140 case EST_DynamicNone:
17141 case EST_MSAny:
17142 case EST_None:
17143 break;
17144
17145 case EST_DependentNoexcept:
17146 case EST_NoexceptFalse:
17147 case EST_NoexceptTrue:
17148 if (!Finder.TraverseStmt(Proto->getNoexceptExpr()))
17149 return true;
17150 LLVM_FALLTHROUGH;
17151
17152 case EST_Dynamic:
17153 for (const auto &E : Proto->exceptions()) {
17154 if (!Finder.TraverseType(E))
17155 return true;
17156 }
17157 break;
17158 }
17159
17160 return false;
17161 }
17162
17163 bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) {
17164 FindCXXThisExpr Finder(*this);
17165
17166 // Check attributes.
17167 for (const auto *A : Method->attrs()) {
17168 // FIXME: This should be emitted by tblgen.
17169 Expr *Arg = nullptr;
17170 ArrayRef<Expr *> Args;
17171 if (const auto *G = dyn_cast<GuardedByAttr>(A))
17172 Arg = G->getArg();
17173 else if (const auto *G = dyn_cast<PtGuardedByAttr>(A))
17174 Arg = G->getArg();
17175 else if (const auto *AA = dyn_cast<AcquiredAfterAttr>(A))
17176 Args = llvm::makeArrayRef(AA->args_begin(), AA->args_size());
17177 else if (const auto *AB = dyn_cast<AcquiredBeforeAttr>(A))
17178 Args = llvm::makeArrayRef(AB->args_begin(), AB->args_size());
17179 else if (const auto *ETLF = dyn_cast<ExclusiveTrylockFunctionAttr>(A)) {
17180 Arg = ETLF->getSuccessValue();
17181 Args = llvm::makeArrayRef(ETLF->args_begin(), ETLF->args_size());
17182 } else if (const auto *STLF = dyn_cast<SharedTrylockFunctionAttr>(A)) {
17183 Arg = STLF->getSuccessValue();
17184 Args = llvm::makeArrayRef(STLF->args_begin(), STLF->args_size());
17185 } else if (const auto *LR = dyn_cast<LockReturnedAttr>(A))
17186 Arg = LR->getArg();
17187 else if (const auto *LE = dyn_cast<LocksExcludedAttr>(A))
17188 Args = llvm::makeArrayRef(LE->args_begin(), LE->args_size());
17189 else if (const auto *RC = dyn_cast<RequiresCapabilityAttr>(A))
17190 Args = llvm::makeArrayRef(RC->args_begin(), RC->args_size());
17191 else if (const auto *AC = dyn_cast<AcquireCapabilityAttr>(A))
17192 Args = llvm::makeArrayRef(AC->args_begin(), AC->args_size());
17193 else if (const auto *AC = dyn_cast<TryAcquireCapabilityAttr>(A))
17194 Args = llvm::makeArrayRef(AC->args_begin(), AC->args_size());
17195 else if (const auto *RC = dyn_cast<ReleaseCapabilityAttr>(A))
17196 Args = llvm::makeArrayRef(RC->args_begin(), RC->args_size());
17197
17198 if (Arg && !Finder.TraverseStmt(Arg))
17199 return true;
17200
17201 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
17202 if (!Finder.TraverseStmt(Args[I]))
17203 return true;
17204 }
17205 }
17206
17207 return false;
17208 }
17209
17210 void Sema::checkExceptionSpecification(
17211 bool IsTopLevel, ExceptionSpecificationType EST,
17212 ArrayRef<ParsedType> DynamicExceptions,
17213 ArrayRef<SourceRange> DynamicExceptionRanges, Expr *NoexceptExpr,
17214 SmallVectorImpl<QualType> &Exceptions,
17215 FunctionProtoType::ExceptionSpecInfo &ESI) {
17216 Exceptions.clear();
17217 ESI.Type = EST;
17218 if (EST == EST_Dynamic) {
17219 Exceptions.reserve(DynamicExceptions.size());
17220 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) {
17221 // FIXME: Preserve type source info.
17222 QualType ET = GetTypeFromParser(DynamicExceptions[ei]);
17223
17224 if (IsTopLevel) {
17225 SmallVector<UnexpandedParameterPack, 2> Unexpanded;
17226 collectUnexpandedParameterPacks(ET, Unexpanded);
17227 if (!Unexpanded.empty()) {
17228 DiagnoseUnexpandedParameterPacks(
17229 DynamicExceptionRanges[ei].getBegin(), UPPC_ExceptionType,
17230 Unexpanded);
17231 continue;
17232 }
17233 }
17234
17235 // Check that the type is valid for an exception spec, and
17236 // drop it if not.
17237 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei]))
17238 Exceptions.push_back(ET);
17239 }
17240 ESI.Exceptions = Exceptions;
17241 return;
17242 }
17243
17244 if (isComputedNoexcept(EST)) {
17245 assert((NoexceptExpr->isTypeDependent() ||
17246 NoexceptExpr->getType()->getCanonicalTypeUnqualified() ==
17247 Context.BoolTy) &&
17248 "Parser should have made sure that the expression is boolean");
17249 if (IsTopLevel && DiagnoseUnexpandedParameterPack(NoexceptExpr)) {
17250 ESI.Type = EST_BasicNoexcept;
17251 return;
17252 }
17253
17254 ESI.NoexceptExpr = NoexceptExpr;
17255 return;
17256 }
17257 }
17258
17259 void Sema::actOnDelayedExceptionSpecification(Decl *MethodD,
17260 ExceptionSpecificationType EST,
17261 SourceRange SpecificationRange,
17262 ArrayRef<ParsedType> DynamicExceptions,
17263 ArrayRef<SourceRange> DynamicExceptionRanges,
17264 Expr *NoexceptExpr) {
17265 if (!MethodD)
17266 return;
17267
17268 // Dig out the method we're referring to.
17269 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(MethodD))
17270 MethodD = FunTmpl->getTemplatedDecl();
17271
17272 CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(MethodD);
17273 if (!Method)
17274 return;
17275
17276 // Check the exception specification.
17277 llvm::SmallVector<QualType, 4> Exceptions;
17278 FunctionProtoType::ExceptionSpecInfo ESI;
17279 checkExceptionSpecification(/*IsTopLevel*/true, EST, DynamicExceptions,
17280 DynamicExceptionRanges, NoexceptExpr, Exceptions,
17281 ESI);
17282
17283 // Update the exception specification on the function type.
17284 Context.adjustExceptionSpec(Method, ESI, /*AsWritten*/true);
17285
17286 if (Method->isStatic())
17287 checkThisInStaticMemberFunctionExceptionSpec(Method);
17288
17289 if (Method->isVirtual()) {
17290 // Check overrides, which we previously had to delay.
17291 for (const CXXMethodDecl *O : Method->overridden_methods())
17292 CheckOverridingFunctionExceptionSpec(Method, O);
17293 }
17294 }
17295
17296 /// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class.
17297 ///
17298 MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record,
17299 SourceLocation DeclStart, Declarator &D,
17300 Expr *BitWidth,
17301 InClassInitStyle InitStyle,
17302 AccessSpecifier AS,
17303 const ParsedAttr &MSPropertyAttr) {
17304 IdentifierInfo *II = D.getIdentifier();
17305 if (!II) {
17306 Diag(DeclStart, diag::err_anonymous_property);
17307 return nullptr;
17308 }
17309 SourceLocation Loc = D.getIdentifierLoc();
17310
17311 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
17312 QualType T = TInfo->getType();
17313 if (getLangOpts().CPlusPlus) {
17314 CheckExtraCXXDefaultArguments(D);
17315
17316 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
17317 UPPC_DataMemberType)) {
17318 D.setInvalidType();
17319 T = Context.IntTy;
17320 TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
17321 }
17322 }
17323
17324 DiagnoseFunctionSpecifiers(D.getDeclSpec());
17325
17326 if (D.getDeclSpec().isInlineSpecified())
17327 Diag(D.getDeclSpec().getInlineSpecLoc(), diag::err_inline_non_function)
17328 << getLangOpts().CPlusPlus17;
17329 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec())
17330 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
17331 diag::err_invalid_thread)
17332 << DeclSpec::getSpecifierName(TSCS);
17333
17334 // Check to see if this name was declared as a member previously
17335 NamedDecl *PrevDecl = nullptr;
17336 LookupResult Previous(*this, II, Loc, LookupMemberName,
17337 ForVisibleRedeclaration);
17338 LookupName(Previous, S);
17339 switch (Previous.getResultKind()) {
17340 case LookupResult::Found:
17341 case LookupResult::FoundUnresolvedValue:
17342 PrevDecl = Previous.getAsSingle<NamedDecl>();
17343 break;
17344
17345 case LookupResult::FoundOverloaded:
17346 PrevDecl = Previous.getRepresentativeDecl();
17347 break;
17348
17349 case LookupResult::NotFound:
17350 case LookupResult::NotFoundInCurrentInstantiation:
17351 case LookupResult::Ambiguous:
17352 break;
17353 }
17354
17355 if (PrevDecl && PrevDecl->isTemplateParameter()) {
17356 // Maybe we will complain about the shadowed template parameter.
17357 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
17358 // Just pretend that we didn't see the previous declaration.
17359 PrevDecl = nullptr;
17360 }
17361
17362 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S))
17363 PrevDecl = nullptr;
17364
17365 SourceLocation TSSL = D.getBeginLoc();
17366 MSPropertyDecl *NewPD =
17367 MSPropertyDecl::Create(Context, Record, Loc, II, T, TInfo, TSSL,
17368 MSPropertyAttr.getPropertyDataGetter(),
17369 MSPropertyAttr.getPropertyDataSetter());
17370 ProcessDeclAttributes(TUScope, NewPD, D);
17371 NewPD->setAccess(AS);
17372
17373 if (NewPD->isInvalidDecl())
17374 Record->setInvalidDecl();
17375
17376 if (D.getDeclSpec().isModulePrivateSpecified())
17377 NewPD->setModulePrivate();
17378
17379 if (NewPD->isInvalidDecl() && PrevDecl) {
17380 // Don't introduce NewFD into scope; there's already something
17381 // with the same name in the same scope.
17382 } else if (II) {
17383 PushOnScopeChains(NewPD, S);
17384 } else
17385 Record->addDecl(NewPD);
17386
17387 return NewPD;
17388 }
17389
17390 void Sema::ActOnStartFunctionDeclarationDeclarator(
17391 Declarator &Declarator, unsigned TemplateParameterDepth) {
17392 auto &Info = InventedParameterInfos.emplace_back();
17393 TemplateParameterList *ExplicitParams = nullptr;
17394 ArrayRef<TemplateParameterList *> ExplicitLists =
17395 Declarator.getTemplateParameterLists();
17396 if (!ExplicitLists.empty()) {
17397 bool IsMemberSpecialization, IsInvalid;
17398 ExplicitParams = MatchTemplateParametersToScopeSpecifier(
17399 Declarator.getBeginLoc(), Declarator.getIdentifierLoc(),
17400 Declarator.getCXXScopeSpec(), /*TemplateId=*/nullptr,
17401 ExplicitLists, /*IsFriend=*/false, IsMemberSpecialization, IsInvalid,
17402 /*SuppressDiagnostic=*/true);
17403 }
17404 if (ExplicitParams) {
17405 Info.AutoTemplateParameterDepth = ExplicitParams->getDepth();
17406 for (NamedDecl *Param : *ExplicitParams)
17407 Info.TemplateParams.push_back(Param);
17408 Info.NumExplicitTemplateParams = ExplicitParams->size();
17409 } else {
17410 Info.AutoTemplateParameterDepth = TemplateParameterDepth;
17411 Info.NumExplicitTemplateParams = 0;
17412 }
17413 }
17414
17415 void Sema::ActOnFinishFunctionDeclarationDeclarator(Declarator &Declarator) {
17416 auto &FSI = InventedParameterInfos.back();
17417 if (FSI.TemplateParams.size() > FSI.NumExplicitTemplateParams) {
17418 if (FSI.NumExplicitTemplateParams != 0) {
17419 TemplateParameterList *ExplicitParams =
17420 Declarator.getTemplateParameterLists().back();
17421 Declarator.setInventedTemplateParameterList(
17422 TemplateParameterList::Create(
17423 Context, ExplicitParams->getTemplateLoc(),
17424 ExplicitParams->getLAngleLoc(), FSI.TemplateParams,
17425 ExplicitParams->getRAngleLoc(),
17426 ExplicitParams->getRequiresClause()));
17427 } else {
17428 Declarator.setInventedTemplateParameterList(
17429 TemplateParameterList::Create(
17430 Context, SourceLocation(), SourceLocation(), FSI.TemplateParams,
17431 SourceLocation(), /*RequiresClause=*/nullptr));
17432 }
17433 }
17434 InventedParameterInfos.pop_back();
17435 }
clang::Sema::BuildStdInitializerList
QualType BuildStdInitializerList(QualType Element, SourceLocation Loc)
Looks for the std::initializer_list template and instantiates it with Element, or emits an error if i...
Definition: SemaDeclCXX.cpp:10902
clang::Sema::TypeDiagnoser
Abstract class used to diagnose incomplete types.
Definition: Sema.h:1665
clang::TST_decltype
Definition: Specifiers.h:89
clang::ComparisonCategoryInfo
Definition: ComparisonCategories.h:74
clang::CXXOperatorCallExpr
A call to an overloaded operator written using operator syntax.
Definition: ExprCXX.h:78
clang::CXXCtorInitializer::isBaseInitializer
bool isBaseInitializer() const
Determine whether this initializer is initializing a base class.
Definition: DeclCXX.h:2224
clang::DeclarationNameInfo::getLoc
SourceLocation getLoc() const
getLoc - Returns the main location of the declaration name.
Definition: DeclarationName.h:719
clang::NamespaceDecl::Create
static NamespaceDecl * Create(ASTContext &C, DeclContext *DC, bool Inline, SourceLocation StartLoc, SourceLocation IdLoc, IdentifierInfo *Id, NamespaceDecl *PrevDecl)
Definition: DeclCXX.cpp:2747
ParsedTemplate.h
clang::Sema::lookupStdExperimentalNamespace
NamespaceDecl * lookupStdExperimentalNamespace()
Definition: SemaDeclCXX.cpp:10640
clang::Sema::ActOnFinishTrailingRequiresClause
ExprResult ActOnFinishTrailingRequiresClause(ExprResult ConstraintExpr)
Definition: SemaDeclCXX.cpp:3885
clang::CXXCtorInitializer::setSourceOrder
void setSourceOrder(int Pos)
Set the source order of this initializer.
Definition: DeclCXX.h:2338
clang::Builtin::ID
ID
Definition: Builtins.h:46
ASTContext.h
Defines the clang::ASTContext interface.
clang::ASTContext::getAddrSpaceQualType
QualType getAddrSpaceQualType(QualType T, LangAS AddressSpace) const
Return the uniqued reference to the type for an address space qualified type with the specified type ...
Definition: ASTContext.cpp:2868
clang::Sema::ActOnFinishDelayedMemberInitializers
void ActOnFinishDelayedMemberInitializers(Decl *Record)
Definition: SemaDeclCXX.cpp:12677
clang::Sema::VariadicCallType
VariadicCallType
Definition: Sema.h:10527
clang::DeclRefExpr::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.cpp:601
clang::CallExpr::isCallToStdMove
bool isCallToStdMove() const
Definition: Expr.h:2799
clang::ParmVarDecl::setScopeInfo
void setScopeInfo(unsigned scopeDepth, unsigned parameterIndex)
Definition: Decl.h:1628
AR_dependent
Definition: SemaAccess.cpp:33
collectUnexpandedParameterPacks
static void collectUnexpandedParameterPacks(Sema &S, TemplateParameterList *Params, SmallVectorImpl< UnexpandedParameterPack > &Unexpanded)
Definition: SemaTemplateInstantiateDecl.cpp:2721
AttributeCommonInfo.h
clang::Sema::ActOnCondition
ConditionResult ActOnCondition(Scope *S, SourceLocation Loc, Expr *SubExpr, ConditionKind CK)
Definition: SemaExpr.cpp:17431
clang::CXXRecordDecl::hasConstexprDestructor
bool hasConstexprDestructor() const
Determine whether this class has a constexpr destructor.
Definition: DeclCXX.cpp:538
clang::UsingShadowDecl::getTargetDecl
NamedDecl * getTargetDecl() const
Gets the underlying declaration which has been brought into the local scope.
Definition: DeclCXX.h:3224
clang::CXXThisExpr::getBeginLoc
SourceLocation getBeginLoc() const
Definition: ExprCXX.h:1115
clang::Sema::RequireNonAbstractType
bool RequireNonAbstractType(SourceLocation Loc, QualType T, TypeDiagnoser &Diagnoser)
Definition: SemaDeclCXX.cpp:5550
clang::Decl::setImplicit
void setImplicit(bool I=true)
Definition: DeclBase.h:559
clang::FunctionDecl
Represents a function declaration or definition.
Definition: Decl.h:1783
buildSingleCopyAssignRecursively
static StmtResult buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, const ExprBuilder &To, const ExprBuilder &From, bool CopyingBaseSubobject, bool Copying, unsigned Depth=0)
Builds a statement that copies/moves the given entity from From to To.
Definition: SemaDeclCXX.cpp:13252
CheckConstraintSatisfaction
static bool CheckConstraintSatisfaction(Sema &S, const NamedDecl *Template, ArrayRef< const Expr *> ConstraintExprs, ArrayRef< TemplateArgument > TemplateArgs, SourceRange TemplateIDRange, ConstraintSatisfaction &Satisfaction)
Definition: SemaConcept.cpp:233
clang::TargetInfo::CCK_ClangABI4OrPS4
Definition: TargetInfo.h:1305
clang::LookupResult::FoundOverloaded
Name lookup found a set of overloaded functions that met the criteria.
Definition: Lookup.h:63
clang::Sema::getStdNamespace
NamespaceDecl * getStdNamespace() const
Definition: SemaDeclCXX.cpp:10635
clang::Declarator::getFunctionTypeInfo
DeclaratorChunk::FunctionTypeInfo & getFunctionTypeInfo()
getFunctionTypeInfo - Retrieves the function type info object (looking through parentheses).
Definition: DeclSpec.h:2313
Diag
static DiagnosticBuilder Diag(DiagnosticsEngine *Diags, const LangOptions &Features, FullSourceLoc TokLoc, const char *TokBegin, const char *TokRangeBegin, const char *TokRangeEnd, unsigned DiagID)
Produce a diagnostic highlighting some portion of a literal.
Definition: LiteralSupport.cpp:77
clang::CXXCtorInitializer::getInit
Expr * getInit() const
Get the initializer.
Definition: DeclCXX.h:2353
clang::DeclaratorChunk::FunctionTypeInfo::RefQualifierIsLValueRef
unsigned RefQualifierIsLValueRef
Whether the ref-qualifier (if any) is an lvalue reference.
Definition: DeclSpec.h:1291
clang::Sema::CheckConstructor
void CheckConstructor(CXXConstructorDecl *Constructor)
CheckConstructor - Checks a fully-formed constructor for well-formedness, issuing any diagnostics req...
Definition: SemaDeclCXX.cpp:9846
clang::Sema::PerformContextuallyConvertToBool
ExprResult PerformContextuallyConvertToBool(Expr *From)
PerformContextuallyConvertToBool - Perform a contextual conversion of the expression From to bool (C+...
Definition: SemaOverload.cpp:5439
clang::CXXBasePaths::setOrigin
void setOrigin(CXXRecordDecl *Rec)
Definition: CXXInheritance.h:229
clang::Sema::SpecialMemberOverloadResult::getMethod
CXXMethodDecl * getMethod() const
Definition: Sema.h:1147
clang::EST_None
no exception specification
Definition: ExceptionSpecificationType.h:21
clang::DynamicInitKind::Initializer
checkMemberDecomposition
static bool checkMemberDecomposition(Sema &S, ArrayRef< BindingDecl *> Bindings, ValueDecl *Src, QualType DecompType, const CXXRecordDecl *OrigRD)
Definition: SemaDeclCXX.cpp:1326
clang::InheritingConcreteTypeLoc::getTypePtr
const TypeClass * getTypePtr() const
Definition: TypeLoc.h:502
clang::OpaquePtr::get
PtrTy get() const
Definition: Ownership.h:80
clang::if
if(T->getSizeExpr()) TRY_TO(TraverseStmt(T -> getSizeExpr()))
Definition: RecursiveASTVisitor.h:1045
clang::PointerType
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2614
clang::EvaluatedExprVisitor
EvaluatedExprVisitor - This class visits &#39;Expr *&#39;s.
Definition: EvaluatedExprVisitor.h:111
clang::ASTContext::VoidPtrTy
CanQualType VoidPtrTy
Definition: ASTContext.h:1044
clang::PointerType::getPointeeType
QualType getPointeeType() const
Definition: Type.h:2627
clang::ComparisonCategoryInfo::ValueInfo
Definition: ComparisonCategories.h:83
clang::Sema::CXXInvalid
Definition: Sema.h:1247
clang::QualType
A (possibly-)qualified type.
Definition: Type.h:654
clang::Sema::Consumer
ASTConsumer & Consumer
Definition: Sema.h:386
clang::TypoCorrection
Simple class containing the result of Sema::CorrectTypo.
Definition: TypoCorrection.h:42
clang::QualType::isPODType
bool isPODType(const ASTContext &Context) const
Determine whether this is a Plain Old Data (POD) type (C++ 3.9p10).
Definition: Type.cpp:2185
clang::CXXRecordDecl::bases
base_class_range bases()
Definition: DeclCXX.h:587
clang::Type::isArrayType
bool isArrayType() const
Definition: Type.h:6570
clang::NestedNameSpecifierLocBuilder::MakeTrivial
void MakeTrivial(ASTContext &Context, NestedNameSpecifier *Qualifier, SourceRange R)
Make a new nested-name-specifier from incomplete source-location information.
Definition: NestedNameSpecifier.cpp:639
clang::MemberExpr::getMemberDecl
ValueDecl * getMemberDecl() const
Retrieve the member declaration to which this expression refers.
Definition: Expr.h:2919
clang::AtomicTypeLoc
Definition: TypeLoc.h:2358
clang::FunctionDecl::isOverloadedOperator
bool isOverloadedOperator() const
Whether this function declaration represents an C++ overloaded operator, e.g., "operator+".
Definition: Decl.h:2525
clang::CallExpr::getArg
Expr * getArg(unsigned Arg)
getArg - Return the specified argument.
Definition: Expr.h:2702
clang::CXXRecordDecl::getNumBases
unsigned getNumBases() const
Retrieves the number of base classes of this class.
Definition: DeclCXX.h:581
CheckConstexprReturnType
static bool CheckConstexprReturnType(Sema &SemaRef, const FunctionDecl *FD, Sema::CheckConstexprKind Kind)
Check whether a function&#39;s return type is a literal type.
Definition: SemaDeclCXX.cpp:1653
clang::Preprocessor::getIdentifierInfo
IdentifierInfo * getIdentifierInfo(StringRef Name) const
Return information about the specified preprocessor identifier token.
Definition: Preprocessor.h:1170
clang::UnqualifiedId::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
Return the source range that covers this unqualified-id.
Definition: DeclSpec.h:1160
clang::FunctionDecl::isExternC
bool isExternC() const
Determines whether this function is a function with external, C linkage.
Definition: Decl.cpp:3075
clang::Sema::ActOnFinishNamespaceDef
void ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace)
ActOnFinishNamespaceDef - This callback is called after a namespace is exited.
Definition: SemaDeclCXX.cpp:10614
clang::LambdaExpr::capture_end
capture_iterator capture_end() const
Retrieve an iterator pointing past the end of the sequence of lambda captures.
Definition: ExprCXX.cpp:1249
clang::EST_Unparsed
not parsed yet
Definition: ExceptionSpecificationType.h:32
clang::Sema::ActOnIntegerConstant
ExprResult ActOnIntegerConstant(SourceLocation Loc, uint64_t Val)
Definition: SemaExpr.cpp:3447
clang::UnqualifiedId::StartLocation
SourceLocation StartLocation
The location of the first token that describes this unqualified-id, which will be the location of the...
Definition: DeclSpec.h:1018
clang::NestedNameSpecifierLoc::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
Retrieve the source range covering the entirety of this nested-name-specifier.
Definition: NestedNameSpecifier.cpp:421
clang::Declarator::getTypeObject
const DeclaratorChunk & getTypeObject(unsigned i) const
Return the specified TypeInfo from this declarator.
Definition: DeclSpec.h:2224
clang::TypeAliasTemplateDecl::Create
static TypeAliasTemplateDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation L, DeclarationName Name, TemplateParameterList *Params, NamedDecl *Decl)
Create a function template node.
Definition: DeclTemplate.cpp:1070
clang::OverloadCandidateSet::OperatorRewriteInfo
Information about operator rewrites to consider when adding operator functions to a candidate set...
Definition: Overload.h:922
clang::DeclSpec::SetTypeQual
bool SetTypeQual(TQ T, SourceLocation Loc)
Definition: DeclSpec.cpp:923
clang::Sema::LookupOrdinaryName
Ordinary name lookup, which finds ordinary names (functions, variables, typedefs, etc...
Definition: Sema.h:3435
clang::FunctionDecl::willHaveBody
bool willHaveBody() const
True if this function will eventually have a body, once it&#39;s fully parsed.
Definition: Decl.h:2347
clang::DeclarationNameTable::getCXXConstructorName
DeclarationName getCXXConstructorName(CanQualType Ty)
Returns the name of a C++ constructor for the given Type.
Definition: DeclarationName.cpp:298
findTrivialSpecialMember
static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM, unsigned Quals, bool ConstRHS, Sema::TrivialABIHandling TAH, CXXMethodDecl **Selected)
Perform lookup for a special member of the specified kind, and determine whether it is trivial...
Definition: SemaDeclCXX.cpp:8881
findDecomposableBaseClass
static DeclAccessPair findDecomposableBaseClass(Sema &S, SourceLocation Loc, const CXXRecordDecl *RD, CXXCastPath &BasePath)
Find the base class to decompose in a built-in decomposition of a class type.
Definition: SemaDeclCXX.cpp:1255
clang::FieldDecl::getInClassInitStyle
InClassInitStyle getInClassInitStyle() const
Get the kind of (C++11) default member initializer that this field has.
Definition: Decl.h:2862
clang::InitListExpr::getInit
const Expr * getInit(unsigned Init) const
Definition: Expr.h:4451
clang::ASTContext::Char32Ty
CanQualType Char32Ty
Definition: ASTContext.h:1024
TSK_BaseClass
The subobject is a base class.
Definition: SemaDeclCXX.cpp:9028
clang::LookupResult::setLookupName
void setLookupName(DeclarationName Name)
Sets the name to look up.
Definition: Lookup.h:248
clang::Sema::LookupName
bool LookupName(LookupResult &R, Scope *S, bool AllowBuiltinCreation=false)
Perform unqualified name lookup starting from a given scope.
Definition: SemaLookup.cpp:1942
clang::UsingPackDecl::Create
static UsingPackDecl * Create(ASTContext &C, DeclContext *DC, NamedDecl *InstantiatedFrom, ArrayRef< NamedDecl *> UsingDecls)
Definition: DeclCXX.cpp:2956
clang::Sema::CheckExplicitlyDefaultedComparison
bool CheckExplicitlyDefaultedComparison(Scope *S, FunctionDecl *MD, DefaultedComparisonKind DCK)
Definition: SemaDeclCXX.cpp:7945
clang::TypeLoc::getNextTypeLoc
TypeLoc getNextTypeLoc() const
Get the next TypeLoc pointed by this TypeLoc, e.g for "int*" the TypeLoc is a PointerLoc and next Typ...
Definition: TypeLoc.h:169
clang::Sema::CodeSynthesisContext::Entity
Decl * Entity
The entity that is being synthesized.
Definition: Sema.h:8085
clang::PseudoObjectExpr::semantics_iterator
Expr *const * semantics_iterator
Definition: Expr.h:5781
LookupStdInitializerList
static ClassTemplateDecl * LookupStdInitializerList(Sema &S, SourceLocation Loc)
Definition: SemaDeclCXX.cpp:10868
clang::Stmt
Stmt - This represents one statement.
Definition: Stmt.h:66
clang::UnqualifiedId::Identifier
IdentifierInfo * Identifier
When Kind == IK_Identifier, the parsed identifier, or when Kind == IK_UserLiteralId, the identifier suffix.
Definition: DeclSpec.h:988
clang::Sema::getCurrentClass
CXXRecordDecl * getCurrentClass(Scope *S, const CXXScopeSpec *SS)
Get the class that is directly named by the current context.
Definition: SemaDeclCXX.cpp:2327
clang::LookupResult::makeFilter
Filter makeFilter()
Create a filter for this result set.
Definition: Lookup.h:682
clang::Sema::CXXDestructor
Definition: Sema.h:1246
ErrorKind
ErrorKind
Definition: NullabilityChecker.cpp:70
clang::Redeclarable::setPreviousDecl
void setPreviousDecl(decl_type *PrevDecl)
Set the previous declaration.
Definition: Decl.h:4473
clang::FunctionType
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:3422
clang::CXXTryStmt::getHandler
CXXCatchStmt * getHandler(unsigned i)
Definition: StmtCXX.h:107
clang::IfStmt
IfStmt - This represents an if/then/else.
Definition: Stmt.h:1834
EvaluatedExprVisitor.h
clang::Sema::ActOnCompoundStmt
StmtResult ActOnCompoundStmt(SourceLocation L, SourceLocation R, ArrayRef< Stmt *> Elts, bool isStmtExpr)
Definition: SemaStmt.cpp:388
clang::Type::getPointeeType
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee...
Definition: Type.cpp:557
clang::FunctionDecl::isMain
bool isMain() const
Determines whether this function is "main", which is the entry point into an executable program...
Definition: Decl.cpp:2926
clang::ComparisonCategoryResult::Equal
clang::Sema::DefaultedFunctionKind::asComparison
DefaultedComparisonKind asComparison() const
Definition: Sema.h:2634
clang::TargetInfo::getTriple
const llvm::Triple & getTriple() const
Returns the target triple of the primary target.
Definition: TargetInfo.h:994
clang::FunctionProtoType::hasExtParameterInfos
bool hasExtParameterInfos() const
Is there any interesting extra information for any of the parameters of this function type...
Definition: Type.h:4148
clang::Sema::CheckImplicitSpecialMemberDeclaration
void CheckImplicitSpecialMemberDeclaration(Scope *S, FunctionDecl *FD)
Check a completed declaration of an implicit special member.
Definition: SemaDeclCXX.cpp:12543
clang::Type::isElaboratedTypeSpecifier
bool isElaboratedTypeSpecifier() const
Determine wither this type is a C++ elaborated-type-specifier.
Definition: Type.cpp:2736
clang::EnumConstantDecl
An instance of this object exists for each enum constant that is defined.
Definition: Decl.h:2941
clang::Type::isRealFloatingType
bool isRealFloatingType() const
Floating point categories.
Definition: Type.cpp:2021
clang::DeclSpec::SCS_unspecified
Definition: DeclSpec.h:233
clang::CXXRecordDecl::getNumVBases
unsigned getNumVBases() const
Retrieves the number of virtual base classes of this class.
Definition: DeclCXX.h:602
clang::VarDecl::getStorageClass
StorageClass getStorageClass() const
Returns the storage class as written in the source.
Definition: Decl.h:1029
clang::ElaboratedTypeLoc
Definition: TypeLoc.h:2087
Base
clang::Sema::ActOnStartDelayedCXXMethodDeclaration
void ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *Method)
ActOnStartDelayedCXXMethodDeclaration - We have completed parsing a top-level (non-nested) C++ class...
Definition: SemaDeclCXX.cpp:9706
clang::CharSourceRange::getTokenRange
static CharSourceRange getTokenRange(SourceRange R)
Definition: SourceLocation.h:258
clang::QualType::addConst
void addConst()
Add the const type qualifier to this QualType.
Definition: Type.h:823
clang::FunctionDecl::isConstexpr
bool isConstexpr() const
Whether this is a (C++11) constexpr function or constexpr constructor.
Definition: Decl.h:2200
clang::Sema::ActOnUsingDirective
Decl * ActOnUsingDirective(Scope *CurScope, SourceLocation UsingLoc, SourceLocation NamespcLoc, CXXScopeSpec &SS, SourceLocation IdentLoc, IdentifierInfo *NamespcName, const ParsedAttributesView &AttrList)
Definition: SemaDeclCXX.cpp:10993
clang::Sema::CheckCompletedCXXClass
void CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record)
Perform semantic checks on a class definition that has been completing, introducing implicitly-declar...
Definition: SemaDeclCXX.cpp:6323
clang::StringLiteral::isAscii
bool isAscii() const
Definition: Expr.h:1830
clang::Type::isRecordType
bool isRecordType() const
Definition: Type.h:6594
getTrivialTypeTemplateArgument
static TemplateArgumentLoc getTrivialTypeTemplateArgument(Sema &S, SourceLocation Loc, QualType T)
Definition: SemaDeclCXX.cpp:1023
clang::MemberExpr::getBase
Expr * getBase() const
Definition: Expr.h:2913
clang::CXXScopeSpec::isEmpty
bool isEmpty() const
No scope specifier.
Definition: DeclSpec.h:189
clang::Sema::ActOnCXXConditionDeclaration
DeclResult ActOnCXXConditionDeclaration(Scope *S, Declarator &D)
ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a C++ if/switch/while/for statem...
Definition: SemaDeclCXX.cpp:16692
clang::LookupResult::Filter::erase
void erase()
Erase the last element returned from this iterator.
Definition: Lookup.h:654
clang::InitializedEntity::InitializeMember
static InitializedEntity InitializeMember(FieldDecl *Member, const InitializedEntity *Parent=nullptr, bool Implicit=false)
Create the initialization entity for a member subobject.
Definition: Initialization.h:356
getTemplateSpecializationKind
static TemplateSpecializationKind getTemplateSpecializationKind(Decl *D)
Determine what kind of template specialization the given declaration is.
Definition: SemaTemplate.cpp:7688
clang::Sema::BuildUsingDeclaration
NamedDecl * BuildUsingDeclaration(Scope *S, AccessSpecifier AS, SourceLocation UsingLoc, bool HasTypenameKeyword, SourceLocation TypenameLoc, CXXScopeSpec &SS, DeclarationNameInfo NameInfo, SourceLocation EllipsisLoc, const ParsedAttributesView &AttrList, bool IsInstantiation)
Builds a using declaration.
Definition: SemaDeclCXX.cpp:11555
clang::InitializedEntity::InitializeParameter
static InitializedEntity InitializeParameter(ASTContext &Context, const ParmVarDecl *Parm)
Create the initialization entity for a parameter.
Definition: Initialization.h:248
clang::Sema::MarkVirtualMemberExceptionSpecsNeeded
void MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, const CXXRecordDecl *RD)
Mark the exception specifications of all virtual member functions in the given class as needed...
Definition: SemaDeclCXX.cpp:16893
clang::ASTContext::getQualifiedType
QualType getQualifiedType(SplitQualType split) const
Un-split a SplitQualType.
Definition: ASTContext.h:1958
clang::ASTContext::getLValueReferenceType
QualType getLValueReferenceType(QualType T, bool SpelledAsLValue=true) const
Return the uniqued reference to the type for an lvalue reference to the specified type...
Definition: ASTContext.cpp:3222
clang::TypeDecl::getTypeForDecl
const Type * getTypeForDecl() const
Definition: Decl.h:3053
clang::CXXRecordDecl::hasIrrelevantDestructor
bool hasIrrelevantDestructor() const
Determine whether this class has a destructor which has no semantic effect.
Definition: DeclCXX.h:1305
clang::Sema::Diag
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Emit a diagnostic.
Definition: Sema.h:1411
clang::Decl
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:88
clang::FunctionDecl::setRangeEnd
void setRangeEnd(SourceLocation E)
Definition: Decl.h:1984
clang::DeclaratorContext::MemberContext
clang::CXXRecordDecl::needsOverloadResolutionForDestructor
bool needsOverloadResolutionForDestructor() const
Determine whether we need to eagerly declare a destructor for this class.
Definition: DeclCXX.h:955
clang::Sema::BuildCallToMemberFunction
ExprResult BuildCallToMemberFunction(Scope *S, Expr *MemExpr, SourceLocation LParenLoc, MultiExprArg Args, SourceLocation RParenLoc)
BuildCallToMemberFunction - Build a call to a member function.
Definition: SemaOverload.cpp:13766
clang::Decl::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: DeclBase.h:421
clang::DeclSpec::SCS_mutable
Definition: DeclSpec.h:240
clang::PartialDiagnostic
Definition: PartialDiagnostic.h:34
clang::CXXMethodDecl::isVirtual
bool isVirtual() const
Definition: DeclCXX.h:1976
FindBaseInitializer
static bool FindBaseInitializer(Sema &SemaRef, CXXRecordDecl *ClassDecl, QualType BaseType, const CXXBaseSpecifier *&DirectBaseSpec, const CXXBaseSpecifier *&VirtualBaseSpec)
Find the direct and/or virtual base specifiers that correspond to the given base type, for use in base initialization within a constructor.
Definition: SemaDeclCXX.cpp:3952
clang::RecordDecl::setArgPassingRestrictions
void setArgPassingRestrictions(ArgPassingKind Kind)
Definition: Decl.h:3906
clang::ComparisonCategoryInfo::Kind
ComparisonCategoryType Kind
The Kind of the comparison category type.
Definition: ComparisonCategories.h:121
clang::CXXBaseSpecifier::isVirtual
bool isVirtual() const
Determines whether the base class is a virtual base class (or not).
Definition: DeclCXX.h:198
clang::VarDecl::getTSCSpec
ThreadStorageClassSpecifier getTSCSpec() const
Definition: Decl.h:1038
clang::BinaryOperator::getOpcode
Opcode getOpcode() const
Definition: Expr.h:3469
P
StringRef P
Definition: ASTMatchersInternal.cpp:485
clang::DeclarationName::getCXXOverloadedOperator
OverloadedOperatorKind getCXXOverloadedOperator() const
If this name is the name of an overloadable operator in C++ (e.g., operator+), retrieve the kind of o...
Definition: DeclarationName.h:462
clang::Scope::isTemplateParamScope
bool isTemplateParamScope() const
isTemplateParamScope - Return true if this scope is a C++ template parameter scope.
Definition: Scope.h:378
clang::Sema::TUScope
Scope * TUScope
Translation Unit Scope - useful to Objective-C actions that need to lookup file scope declarations in...
Definition: Sema.h:906
clang::FunctionDecl::setPure
void setPure(bool P=true)
Definition: Decl.cpp:2913
RemoveAddressSpaceFromPtr
static QualType RemoveAddressSpaceFromPtr(Sema &SemaRef, const PointerType *PtrTy)
Definition: SemaDeclCXX.cpp:14843
clang::VirtSpecifiers::isOverrideSpecified
bool isOverrideSpecified() const
Definition: DeclSpec.h:2604
clang::Decl::FOK_None
Not a friend object.
Definition: DeclBase.h:1102
clang::Decl::getPreviousDecl
Decl * getPreviousDecl()
Retrieve the previous declaration that declares the same entity as this declaration, or NULL if there is no previous declaration.
Definition: DeclBase.h:960
clang::DeclAccessPair::getDecl
NamedDecl * getDecl() const
Definition: DeclAccessPair.h:41
clang::QualType::getNonReferenceType
QualType getNonReferenceType() const
If Type is a reference type (e.g., const int&), returns the type that the reference refers to ("const...
Definition: Type.h:6452
clang::Scope::AddDecl
void AddDecl(Decl *D)
Definition: Scope.h:289
isVirtualDirectBase
static bool isVirtualDirectBase(CXXRecordDecl *Derived, CXXRecordDecl *Base)
Determine whether a direct base class is a virtual base class.
Definition: SemaDeclCXX.cpp:11349
clang::UnqualifiedIdKind::IK_ConstructorTemplateId
A constructor named via a template-id.
clang::ClassTemplateSpecializationDecl::isExplicitSpecialization
bool isExplicitSpecialization() const
Definition: DeclTemplate.h:1900
clang::InitializationKind::CreateDirect
static InitializationKind CreateDirect(SourceLocation InitLoc, SourceLocation LParenLoc, SourceLocation RParenLoc)
Create a direct initialization.
Definition: Initialization.h:602
clang::Sema::CreateBuiltinArraySubscriptExpr
ExprResult CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc, Expr *Idx, SourceLocation RLoc)
Definition: SemaExpr.cpp:4734
clang::FieldDecl::getParent
const RecordDecl * getParent() const
Returns the parent of this field declaration, which is the struct in which this field is defined...
Definition: Decl.h:2918
lookupStdTypeTraitMember
static bool lookupStdTypeTraitMember(Sema &S, LookupResult &TraitMemberLookup, SourceLocation Loc, StringRef Trait, TemplateArgumentListInfo &Args, unsigned DiagID)
Definition: SemaDeclCXX.cpp:958
clang::TypeWithKeyword::getKeywordForTagTypeKind
static ElaboratedTypeKeyword getKeywordForTagTypeKind(TagTypeKind Tag)
Converts a TagTypeKind into an elaborated type keyword.
Definition: Type.cpp:2645
clang::Type
The base class of the type hierarchy.
Definition: Type.h:1450
checkTrivialSubobjectCall
static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, QualType SubType, bool ConstRHS, Sema::CXXSpecialMember CSM, TrivialSubobjectKind Kind, Sema::TrivialABIHandling TAH, bool Diagnose)
Check whether the special member selected for a given type would be trivial.
Definition: SemaDeclCXX.cpp:9036
clang::DeclarationNameInfo::getBeginLoc
SourceLocation getBeginLoc() const
getBeginLoc - Retrieve the location of the first token.
Definition: DeclarationName.h:798
clang::CanQual::getUnqualifiedType
CanQual< T > getUnqualifiedType() const
Retrieve the unqualified form of this type.
Definition: CanonicalType.h:618
clang::Sema::ActOnFinishDelayedCXXMethodDeclaration
void ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *Method)
ActOnFinishDelayedCXXMethodDeclaration - We have finished processing the delayed method declaration f...
Definition: SemaDeclCXX.cpp:9736
clang::Declarator::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: DeclSpec.h:1931
clang::CXXRecordDecl::isDerivedFrom
bool isDerivedFrom(const CXXRecordDecl *Base) const
Determine whether this class is derived from the class Base.
Definition: CXXInheritance.cpp:91
clang::DeclaratorChunk
One instance of this struct is used for each type in a declarator that is parsed. ...
Definition: DeclSpec.h:1174
CXXInheritance.h
clang::ArrayType
Represents an array type, per C99 6.7.5.2 - Array Declarators.
Definition: Type.h:2889
clang::VarTemplateDecl
Declaration of a variable template.
Definition: DeclTemplate.h:3070
clang::InitializationKind::CreateDefault
static InitializationKind CreateDefault(SourceLocation InitLoc)
Create a default initialization.
Definition: Initialization.h:657
clang::NamespaceDecl
Represent a C++ namespace.
Definition: Decl.h:497
isNonlocalVariable
static bool isNonlocalVariable(const Decl *D)
Determine whether the given declaration is a global variable or static data member.
Definition: SemaDeclCXX.cpp:16642
clang::Declarator::isFunctionDeclarator
bool isFunctionDeclarator(unsigned &idx) const
isFunctionDeclarator - This method returns true if the declarator is a function declarator (looking t...
Definition: DeclSpec.h:2282
clang::CXXConstructExpr
Represents a call to a C++ constructor.
Definition: ExprCXX.h:1422
clang::FixItHint::CreateInsertionFromRange
static FixItHint CreateInsertionFromRange(SourceLocation InsertionLoc, CharSourceRange FromRange, bool BeforePreviousInsertions=false)
Create a code modification hint that inserts the given code from FromRange at a specific location...
Definition: Diagnostic.h:105
clang::DeclStmt::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.h:1251
clang::DeclarationNameInfo::getEndLoc
SourceLocation getEndLoc() const LLVM_READONLY
Definition: DeclarationName.h:805
clang::DeclSpec::getSpecifierName
static const char * getSpecifierName(DeclSpec::TST T, const PrintingPolicy &Policy)
Turn a type-specifier-type into a string like "_Bool" or "union".
Definition: DeclSpec.cpp:520
clang::OR_Ambiguous
Ambiguous candidates found.
Definition: Overload.h:59
clang::Decl::getEndLoc
SourceLocation getEndLoc() const LLVM_READONLY
Definition: DeclBase.h:425
clang::TemplateParameterList::getParam
NamedDecl * getParam(unsigned Idx)
Definition: DeclTemplate.h:138
clang::CXXRecordDecl::hasTrivialMoveConstructor
bool hasTrivialMoveConstructor() const
Determine whether this class has a trivial move constructor (C++11 [class.copy]p12) ...
Definition: DeclCXX.h:1204
clang::QualType::withConst
QualType withConst() const
Definition: Type.h:826
clang::DeclaratorChunk::ParamInfo::DefaultArgTokens
std::unique_ptr< CachedTokens > DefaultArgTokens
DefaultArgTokens - When the parameter&#39;s default argument cannot be parsed immediately (because it occ...
Definition: DeclSpec.h:1260
clang::ASTContext::getTargetInfo
const TargetInfo & getTargetInfo() const
Definition: ASTContext.h:707
clang::AccessSpecifier
AccessSpecifier
A C++ access specifier (public, private, protected), plus the special value "none" which means differ...
Definition: Specifiers.h:113
Specifier
const NestedNameSpecifier * Specifier
Definition: USRLocFinder.cpp:172
clang::FunctionProtoType::ExtProtoInfo::RefQualifier
RefQualifierKind RefQualifier
Definition: Type.h:3842
clang::TypeSourceInfo
A container of type source information.
Definition: Type.h:6227
clang::ExplicitSpecifier
Store information needed for an explicit specifier.
Definition: DeclCXX.h:1787
clang::OpaquePtr< QualType >
LiteralSupport.h
clang::FPOptions
Floating point control options.
Definition: LangOptions.h:357
clang::XRayInstrKind::Function
constexpr XRayInstrMask Function
Definition: XRayInstr.h:38
printTemplateArgs
static std::string printTemplateArgs(const PrintingPolicy &PrintingPolicy, TemplateArgumentListInfo &Args)
Definition: SemaDeclCXX.cpp:944
clang::UnqualifiedIdKind::IK_OperatorFunctionId
An overloaded operator name, e.g., operator+.
clang::FunctionDecl::isDefined
bool isDefined(const FunctionDecl *&Definition) const
Returns true if the function has a definition that does not need to be instantiated.
Definition: Decl.cpp:2883
clang::DeclSpec::getThreadStorageClassSpec
TSCS getThreadStorageClassSpec() const
Definition: DeclSpec.h:448
clang::CXXRecordDecl::needsImplicitMoveAssignment
bool needsImplicitMoveAssignment() const
Determine whether this class should get an implicit move assignment operator or if any existing speci...
Definition: DeclCXX.h:925
computeImplicitExceptionSpec
static Sema::ImplicitExceptionSpecification computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, FunctionDecl *FD)
Definition: SemaDeclCXX.cpp:6868
clang::CXXConversionDecl::getConversionType
QualType getConversionType() const
Returns the type that this conversion function is converting to.
Definition: DeclCXX.h:2752
checkMethodTypeQualifiers
static void checkMethodTypeQualifiers(Sema &S, Declarator &D, unsigned DiagID)
Definition: SemaDeclCXX.cpp:9758
clang::InitializedEntity::InitializeMemberFromDefaultMemberInitializer
static InitializedEntity InitializeMemberFromDefaultMemberInitializer(FieldDecl *Member)
Create the initialization entity for a default member initializer.
Definition: Initialization.h:372
clang::LookupResult::Filter::hasNext
bool hasNext() const
Definition: Lookup.h:639
clang::Sema::VerifyICEDiagnoser
Abstract base class used for diagnosing integer constant expression violations.
Definition: Sema.h:11090
clang::CXXBasePath
Represents a path from a specific derived class (which is not represented as part of the path) to a p...
Definition: CXXInheritance.h:70
clang::Decl::getIdentifierNamespace
unsigned getIdentifierNamespace() const
Definition: DeclBase.h:799
clang::CXXConstructorDecl
Represents a C++ constructor within a class.
Definition: DeclCXX.h:2383
clang::LookupResult::clear
LLVM_ATTRIBUTE_REINITIALIZES void clear()
Clears out any current state.
Definition: Lookup.h:554
clang::ParsedAttr::getPropertyDataGetter
IdentifierInfo * getPropertyDataGetter() const
Definition: ParsedAttr.h:460
clang::ASTContext::WideCharTy
CanQualType WideCharTy
Definition: ASTContext.h:1020
clang::CXXRecordDecl::implicitCopyAssignmentHasConstParam
bool implicitCopyAssignmentHasConstParam() const
Determine whether an implicit copy assignment operator for this type would have a parameter with a co...
Definition: DeclCXX.h:888
clang::Sema::CheckCXXDefaultArgExpr
bool CheckCXXDefaultArgExpr(SourceLocation CallLoc, FunctionDecl *FD, ParmVarDecl *Param)
Instantiate or parse a C++ default argument expression as necessary.
Definition: SemaExpr.cpp:4926
findImplicitlyDeclaredEqualityComparisons
static void findImplicitlyDeclaredEqualityComparisons(ASTContext &Ctx, CXXRecordDecl *RD, llvm::SmallVectorImpl< FunctionDecl *> &Spaceships)
Find the equality comparison functions that should be implicitly declared in a given class definition...
Definition: SemaDeclCXX.cpp:9494
distance
float __ovld __cnfn distance(float p0, float p1)
Returns the distance between p0 and p1.
clang::Sema::MarkFunctionReferenced
void MarkFunctionReferenced(SourceLocation Loc, FunctionDecl *Func, bool MightBeOdrUse=true)
Mark a function referenced, and check whether it is odr-used (C++ [basic.def.odr]p2, C99 6.9p3)
Definition: SemaExpr.cpp:15521
clang::CXXRecordDecl::needsOverloadResolutionForCopyConstructor
bool needsOverloadResolutionForCopyConstructor() const
Determine whether we need to eagerly declare a defaulted copy constructor for this class...
Definition: DeclCXX.h:772
clang::FunctionDecl::param_size
size_t param_size() const
Definition: Decl.h:2415
clang::FieldDecl::hasInClassInitializer
bool hasInClassInitializer() const
Determine whether this member has a C++11 default member initializer.
Definition: Decl.h:2869
clang::TypeLoc::getEndLoc
SourceLocation getEndLoc() const
Get the end source location.
Definition: TypeLoc.cpp:228
clang::Sema::MergeCXXFunctionDecl
bool MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, Scope *S)
MergeCXXFunctionDecl - Merge two declarations of the same C++ function, once we already know that the...
Definition: SemaDeclCXX.cpp:436
clang::VirtSpecifiers::getOverrideLoc
SourceLocation getOverrideLoc() const
Definition: DeclSpec.h:2605
clang::Sema::InheritedConstructorInfo
Definition: SemaDeclCXX.cpp:6616
clang::ArrayType::getElementType
QualType getElementType() const
Definition: Type.h:2910
clang::TagDecl::isCompleteDefinition
bool isCompleteDefinition() const
Return true if this decl has its body fully specified.
Definition: Decl.h:3324
clang::Sema::CheckCXXDefaultArguments
void CheckCXXDefaultArguments(FunctionDecl *FD)
CheckCXXDefaultArguments - Verify that the default arguments for a function declaration are well-form...
Definition: SemaDeclCXX.cpp:1529
Value
Value
Definition: UninitializedValues.cpp:101
clang::CXXConstructorDecl::isDefaultConstructor
bool isDefaultConstructor() const
Whether this constructor is a default constructor (C++ [class.ctor]p5), which can be used to default-...
Definition: DeclCXX.cpp:2520
clang::Sema::SynthesizedFunctionScope
RAII object to handle the state changes required to synthesize a function body.
Definition: Sema.h:840
clang::MSInheritanceModel::Virtual
clang::ParsedAttr::getPropertyDataSetter
IdentifierInfo * getPropertyDataSetter() const
Definition: ParsedAttr.h:466
clang::Sema::BuildUsingPackDecl
NamedDecl * BuildUsingPackDecl(NamedDecl *InstantiatedFrom, ArrayRef< NamedDecl *> Expansions)
Definition: SemaDeclCXX.cpp:11813
clang::InitializedEntity::InitializeBase
static InitializedEntity InitializeBase(ASTContext &Context, const CXXBaseSpecifier *Base, bool IsInheritedVirtualBase, const InitializedEntity *Parent=nullptr)
Create the initialization entity for a base class subobject.
Definition: SemaInit.cpp:3240
clang::Sema::DeclareImplicitMoveAssignment
CXXMethodDecl * DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl)
Declare the implicit move assignment operator for the given class.
Definition: SemaDeclCXX.cpp:13792
clang::ParsedAttributesView::end
iterator end()
Definition: ParsedAttr.h:788
ASTLambda.h
This file provides some common utility functions for processing Lambda related AST Constructs...
clang::CXXBasePaths::paths_iterator
std::list< CXXBasePath >::iterator paths_iterator
Definition: CXXInheritance.h:180
clang::ComparisonCategories::getPossibleResultsForType
static std::vector< ComparisonCategoryResult > getPossibleResultsForType(ComparisonCategoryType Type)
Return the list of results which are valid for the specified comparison category type.
Definition: ComparisonCategories.cpp:201
clang::Sema::ActOnDefaultCtorInitializers
void ActOnDefaultCtorInitializers(Decl *CDtorDecl)
Definition: SemaDeclCXX.cpp:5518
clang::CXXBasePath::Decls
DeclContext::lookup_result Decls
The set of declarations found inside this base class subobject.
Definition: CXXInheritance.h:81
clang::Declarator::isFunctionDeclarationContext
bool isFunctionDeclarationContext() const
Return true if this declaration appears in a context where a function declarator would be a function ...
Definition: DeclSpec.h:2336
clang::FriendDecl
FriendDecl - Represents the declaration of a friend entity, which can be a function, a type, or a templated function or type.
Definition: DeclFriend.h:53
clang::TagDecl::isInterface
bool isInterface() const
Definition: Decl.h:3405
clang::CXXConstructExpr::Create
static CXXConstructExpr * Create(const ASTContext &Ctx, QualType Ty, SourceLocation Loc, CXXConstructorDecl *Ctor, bool Elidable, ArrayRef< Expr *> Args, bool HadMultipleCandidates, bool ListInitialization, bool StdInitListInitialization, bool ZeroInitialization, ConstructionKind ConstructKind, SourceRange ParenOrBraceRange)
Create a C++ construction expression.
Definition: ExprCXX.cpp:1071
clang::EnterExpressionEvaluationContext
RAII object that enters a new expression evaluation context.
Definition: Sema.h:12029
clang::Sema::ActOnStartDelayedMemberDeclarations
void ActOnStartDelayedMemberDeclarations(Scope *S, Decl *Record)
Definition: SemaDeclCXX.cpp:9674
clang::VarDecl
Represents a variable declaration or definition.
Definition: Decl.h:820
clang::StmtResult
ActionResult< Stmt * > StmtResult
Definition: Ownership.h:264
clang::Sema::PDiag
PartialDiagnostic PDiag(unsigned DiagID=0)
Build a partial diagnostic.
Definition: SemaInternal.h:24
clang::NestedNameSpecifier::Create
static NestedNameSpecifier * Create(const ASTContext &Context, NestedNameSpecifier *Prefix, IdentifierInfo *II)
Builds a specifier combining a prefix and an identifier.
Definition: NestedNameSpecifier.cpp:58
clang::Declarator
Information about one declarator, including the parsed type information and the identifier.
Definition: DeclSpec.h:1792
clang::FunctionDecl::getReturnType
QualType getReturnType() const
Definition: Decl.h:2445
clang::Sema::Diags
DiagnosticsEngine & Diags
Definition: Sema.h:387
clang::MemberPointerTypeLoc
Wrapper for source info for member pointers.
Definition: TypeLoc.h:1256
clang::SC_Static
Definition: Specifiers.h:239
clang::FunctionProtoType::getNumParams
unsigned getNumParams() const
Definition: Type.h:3964
clang::Type::isEnumeralType
bool isEnumeralType() const
Definition: Type.h:6598
clang::SC_None
Definition: Specifiers.h:237
clang::CXXRecordDecl::finishedDefaultedOrDeletedMember
void finishedDefaultedOrDeletedMember(CXXMethodDecl *MD)
Indicates that the declaration of a defaulted or deleted special member function is now complete...
Definition: DeclCXX.cpp:1333
clang::UnqualifiedIdKind::IK_DestructorName
A destructor name.
clang::Type::getAs
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:7002
clang::ParmVarDecl::hasDefaultArg
bool hasDefaultArg() const
Determines whether this parameter has a default argument, either parsed or not.
Definition: Decl.cpp:2758
clang::Sema::getPrintingPolicy
PrintingPolicy getPrintingPolicy() const
Retrieve a suitable printing policy for diagnostics.
Definition: Sema.h:2487
clang::interp::This
bool This(InterpState &S, CodePtr OpPC)
Definition: Interp.h:827
clang::Sema::computeDeclContext
DeclContext * computeDeclContext(QualType T)
Compute the DeclContext that is associated with the given type.
Definition: SemaCXXScopeSpec.cpp:53
clang::Sema::ActOnFinishCXXNonNestedClass
void ActOnFinishCXXNonNestedClass()
Definition: SemaDeclCXX.cpp:12977
clang::FunctionProtoType::ExtProtoInfo
Extra information about a function prototype.
Definition: Type.h:3837
clang::EST_Dynamic
throw(T1, T2)
Definition: ExceptionSpecificationType.h:23
clang::ParmVarDecl::hasInheritedDefaultArg
bool hasInheritedDefaultArg() const
Definition: Decl.h:1725
clang::CXXBasePaths::clear
void clear()
Clear the base-paths results.
Definition: CXXInheritance.cpp:70
clang::DeclContext::decls
decl_range decls() const
decls_begin/decls_end - Iterate over the declarations stored in this context.
Definition: DeclBase.h:2033
clang::TypeSpecifierType
TypeSpecifierType
Specifies the kind of type.
Definition: Specifiers.h:60
IIK_Default
Definition: SemaDeclCXX.cpp:4526
clang::ComparisonCategoryResult::Equivalent
clang::LangAS
LangAS
Defines the address space values used by the address space qualifier of QualType. ...
Definition: AddressSpaces.h:25
clang::CXXRecordDecl::needsImplicitCopyAssignment
bool needsImplicitCopyAssignment() const
Determine whether this class needs an implicit copy assignment operator to be lazily declared...
Definition: DeclCXX.h:876
clang::MSPropertyDecl::Create
static MSPropertyDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation L, DeclarationName N, QualType T, TypeSourceInfo *TInfo, SourceLocation StartL, IdentifierInfo *Getter, IdentifierInfo *Setter)
Definition: DeclCXX.cpp:3114
clang::TTK_Interface
The "__interface" keyword.
Definition: Type.h:5192
clang::Sema::checkIllFormedTrivialABIStruct
void checkIllFormedTrivialABIStruct(CXXRecordDecl &RD)
Check that the C++ class annoated with "trivial_abi" satisfies all the conditions that are needed for...
Definition: SemaDeclCXX.cpp:9425
clang::TemplateSpecializationTypeLoc
Definition: TypeLoc.h:1574
clang::DiagnosticErrorTrap
RAII class that determines when any errors have occurred between the time the instance was created an...
Definition: Diagnostic.h:1009
clang::NamedDecl::getUnderlyingDecl
NamedDecl * getUnderlyingDecl()
Looks through UsingDecls and ObjCCompatibleAliasDecls for the underlying named decl.
Definition: Decl.h:414
clang::Sema::ActOnFinishFullExpr
ExprResult ActOnFinishFullExpr(Expr *Expr, bool DiscardedValue)
Definition: Sema.h:5849
clang::VirtSpecifiers::getFinalLoc
SourceLocation getFinalLoc() const
Definition: DeclSpec.h:2609
clang::TemplateParameterList::getLAngleLoc
SourceLocation getLAngleLoc() const
Definition: DeclTemplate.h:196
clang::RecordDecl::field_empty
bool field_empty() const
Definition: Decl.h:3971
clang::FieldDecl::isZeroLengthBitField
bool isZeroLengthBitField(const ASTContext &Ctx) const
Is this a zero-length bit-field? Such bit-fields aren&#39;t really bit-fields at all and instead act as a...
Definition: Decl.cpp:4036
clang::LookupResult::isAmbiguous
bool isAmbiguous() const
Definition: Lookup.h:301
clang::TypoCorrection::getCorrectionSpecifier
NestedNameSpecifier * getCorrectionSpecifier() const
Gets the NestedNameSpecifier needed to use the typo correction.
Definition: TypoCorrection.h:91
clang::Sema::SpecialMemberOverloadResult::Ambiguous
Definition: Sema.h:1135
clang::TypoCorrection::getCorrectionDeclAs
DeclClass * getCorrectionDeclAs() const
Definition: TypoCorrection.h:156
clang::DeclContextLookupResult::front
reference front() const
Definition: DeclBase.h:1242
clang::CXXRecordDecl::hasTrivialDefaultConstructor
bool hasTrivialDefaultConstructor() const
Determine whether this class has a trivial default constructor (C++11 [class.ctor]p5).
Definition: DeclCXX.h:1143
clang::ElaboratedTypeLoc::getNamedTypeLoc
TypeLoc getNamedTypeLoc() const
Definition: TypeLoc.h:2125
clang::Decl::isInvalidDecl
bool isInvalidDecl() const
Definition: DeclBase.h:553
clang::IfStmt::getThen
Stmt * getThen()
Definition: Stmt.h:1921
clang::frontend::After
Like System, but searched after the system directories.
Definition: HeaderSearchOptions.h:60
buildMemcpyForAssignmentOp
static StmtResult buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, const ExprBuilder &ToB, const ExprBuilder &FromB)
When generating a defaulted copy or move assignment operator, if a field should be copied with __buil...
Definition: SemaDeclCXX.cpp:13172
clang::TemplateParameterList
Stores a list of template parameters for a TemplateDecl and its derived classes.
Definition: DeclTemplate.h:69
clang::SourceRange::setBegin
void setBegin(SourceLocation b)
Definition: SourceLocation.h:219
clang::TypeWithKeyword::getTagTypeKindName
static StringRef getTagTypeKindName(TagTypeKind Kind)
Definition: Type.h:5269
clang::DeclSpec::hasTypeSpecifier
bool hasTypeSpecifier() const
Return true if any type-specifier has been found.
Definition: DeclSpec.h:624
clang::InitializationKind::CreateDirectList
static InitializationKind CreateDirectList(SourceLocation InitLoc)
Definition: Initialization.h:609
clang::CXXRecordDecl::isInterfaceLike
bool isInterfaceLike() const
Definition: DeclCXX.cpp:1815
clang::PrintingPolicy
Describes how types, statements, expressions, and declarations should be printed. ...
Definition: PrettyPrinter.h:47
clang::Sema::CodeSynthesisContext
A context in which code is being synthesized (where a source location alone is not sufficient to iden...
Definition: Sema.h:7987
clang::CXXDefaultInitExpr::Create
static CXXDefaultInitExpr * Create(const ASTContext &Ctx, SourceLocation Loc, FieldDecl *Field, DeclContext *UsedContext)
Field is the non-static data member whose default initializer is used by this expression.
Definition: ExprCXX.h:1297
clang::Sema::DefineImplicitLambdaToFunctionPointerConversion
void DefineImplicitLambdaToFunctionPointerConversion(SourceLocation CurrentLoc, CXXConversionDecl *Conv)
Define the "body" of the conversion from a lambda object to a function pointer.
Definition: SemaDeclCXX.cpp:14434
SemaInternal.h
clang::NestedNameSpecifier::getKind
SpecifierKind getKind() const
Determine what kind of nested name specifier is stored.
Definition: NestedNameSpecifier.cpp:142
clang::tooling::fixit::internal::getSourceRange
CharSourceRange getSourceRange(const SourceRange &Range)
Returns the token CharSourceRange corresponding to Range.
Definition: FixIt.h:32
clang::DeclaratorChunk::FunctionTypeInfo::hasMethodTypeQualifiers
bool hasMethodTypeQualifiers() const
Determine whether this method has qualifiers.
Definition: DeclSpec.h:1478
clang::CPlusPlus11
Definition: LangStandard.h:48
clang::CXXMethodDecl::isStatic
bool isStatic() const
Definition: DeclCXX.cpp:1983
clang::CXXRecordDecl::hasDefinition
bool hasDefinition() const
Definition: DeclCXX.h:540
clang::ComparisonCategories::getResultString
static StringRef getResultString(ComparisonCategoryResult Kind)
Definition: ComparisonCategories.cpp:183
clang::Sema::ActOnFriendTypeDecl
Decl * ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, MultiTemplateParamsArg TemplateParams)
Handle a friend type declaration.
Definition: SemaDeclCXX.cpp:15877
clang::MultiVersionKind::Target
clang::Sema::CheckConstexprFunctionDefinition
bool CheckConstexprFunctionDefinition(const FunctionDecl *FD, CheckConstexprKind Kind)
Definition: SemaDeclCXX.cpp:1686
clang::AccessSpecDecl::Create
static AccessSpecDecl * Create(ASTContext &C, AccessSpecifier AS, DeclContext *DC, SourceLocation ASLoc, SourceLocation ColonLoc)
Definition: DeclCXX.h:116
clang::ParmVarDecl
Represents a parameter to a function.
Definition: Decl.h:1595
clang::QualType::getLocalUnqualifiedType
QualType getLocalUnqualifiedType() const
Return this type with all of the instance-specific qualifiers removed, but without removing any quali...
Definition: Type.h:893
clang::FunctionDecl::param_iterator
MutableArrayRef< ParmVarDecl * >::iterator param_iterator
Definition: Decl.h:2407
ExprCXX.h
Defines the clang::Expr interface and subclasses for C++ expressions.
clang::frontend::FixIt
Parse and apply any fixits to the source.
Definition: FrontendOptions.h:78
clang::ActionResult::isUnset
bool isUnset() const
Definition: Ownership.h:168
clang::DeclContext::removeDecl
void removeDecl(Decl *D)
Removes a declaration from this context.
Definition: DeclBase.cpp:1444
clang::EST_DependentNoexcept
noexcept(expression), value-dependent
Definition: ExceptionSpecificationType.h:27
clang::ElaboratedTypeLoc::setQualifierLoc
void setQualifierLoc(NestedNameSpecifierLoc QualifierLoc)
Definition: TypeLoc.h:2105
clang::Sema::MergeVarDeclExceptionSpecs
void MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old)
Merge the exception specifications of two variable declarations.
Definition: SemaDeclCXX.cpp:1489
clang::TypeSpecTypeLoc
A reasonable base class for TypeLocs that correspond to types that are written as a type-specifier...
Definition: TypeLoc.h:513
clang::CXXConstructorDecl::getTargetConstructor
CXXConstructorDecl * getTargetConstructor() const
When this constructor delegates to another, retrieve the target.
Definition: DeclCXX.cpp:2511
clang::Qualifiers
The collection of all-type qualifiers we support.
Definition: Type.h:143
clang::FieldDecl::isAnonymousStructOrUnion
bool isAnonymousStructOrUnion() const
Determines whether this field is a representative for an anonymous struct or union.
Definition: Decl.cpp:4021
clang::CXXBasePaths::isRecordingPaths
bool isRecordingPaths() const
Whether we are recording paths.
Definition: CXXInheritance.h:212
clang::CXXRecordDecl::isLocalClass
const FunctionDecl * isLocalClass() const
If the class is a local class [class.local], returns the enclosing function declaration.
Definition: DeclCXX.h:1440
clang::DeclSpec::TQ_restrict
Definition: DeclSpec.h:316
clang::Sema::DefineImplicitMoveConstructor
void DefineImplicitMoveConstructor(SourceLocation CurrentLocation, CXXConstructorDecl *Constructor)
DefineImplicitMoveConstructor - Checks for feasibility of defining this constructor as the move const...
Definition: SemaDeclCXX.cpp:14389
clang::FunctionDecl::getReturnTypeSourceRange
SourceRange getReturnTypeSourceRange() const
Attempt to compute an informative source range covering the function return type. ...
Definition: Decl.cpp:3395
clang::FTIHasNonVoidParameters
bool FTIHasNonVoidParameters(const DeclaratorChunk::FunctionTypeInfo &FTI)
Definition: SemaInternal.h:36
clang::Sema::CheckConstructorDeclarator
QualType CheckConstructorDeclarator(Declarator &D, QualType R, StorageClass &SC)
CheckConstructorDeclarator - Called by ActOnDeclarator to check the well-formedness of the constructo...
Definition: SemaDeclCXX.cpp:9783
isIncompleteOrZeroLengthArrayType
static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T)
Determine whether the given type is an incomplete or zero-lenfgth array type.
Definition: SemaDeclCXX.cpp:4866
clang::Sema::CheckDelayedMemberExceptionSpecs
void CheckDelayedMemberExceptionSpecs()
Definition: SemaDeclCXX.cpp:8249
clang::NamedDecl::getIdentifier
IdentifierInfo * getIdentifier() const
Get the identifier that names this declaration, if there is one.
Definition: Decl.h:244
clang::TypeLoc
Base wrapper for a particular "section" of type source info.
Definition: TypeLoc.h:58
clang::CXXMethodDecl::isMoveAssignmentOperator
bool isMoveAssignmentOperator() const
Determine whether this is a move assignment operator.
Definition: DeclCXX.cpp:2257
clang::DeclSpec::getFriendSpecLoc
SourceLocation getFriendSpecLoc() const
Definition: DeclSpec.h:741
clang::ast_matchers::recordType
const AstTypeMatcher< RecordType > recordType
Matches record types (e.g.
Definition: ASTMatchersInternal.cpp:881
clang::Declarator::isRedeclaration
bool isRedeclaration() const
Definition: DeclSpec.h:2572
clang::Sema::ActOnMemInitializers
void ActOnMemInitializers(Decl *ConstructorDecl, SourceLocation ColonLoc, ArrayRef< CXXCtorInitializer *> MemInits, bool AnyErrors)
ActOnMemInitializers - Handle the member initializers for a constructor.
Definition: SemaDeclCXX.cpp:5328
clang::RecordDecl
Represents a struct/union/class.
Definition: Decl.h:3748
clang::CXXRecordDecl::hasTrivialCopyConstructorForCall
bool hasTrivialCopyConstructorForCall() const
Definition: DeclCXX.h:1185
clang::prec::Relational
Definition: OperatorPrecedence.h:37
clang::Sema::ShouldDeleteSpecialMember
bool ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, InheritedConstructorInfo *ICI=nullptr, bool Diagnose=false)
Determine if a special member function should have a deleted definition when it is defaulted...
Definition: SemaDeclCXX.cpp:8723
clang::Sema::CodeSynthesisContext::Kind
enum clang::Sema::CodeSynthesisContext::SynthesisKind Kind
clang::Sema::LoadExternalVTableUses
void LoadExternalVTableUses()
Load any externally-stored vtable uses.
Definition: SemaDeclCXX.cpp:16713
clang::Sema::CheckUsingDeclQualifier
bool CheckUsingDeclQualifier(SourceLocation UsingLoc, bool HasTypename, const CXXScopeSpec &SS, const DeclarationNameInfo &NameInfo, SourceLocation NameLoc)
Checks that the given nested-name qualifier used in a using decl in the current context is appropriat...
Definition: SemaDeclCXX.cpp:11935
getTupleLikeElementType
static QualType getTupleLikeElementType(Sema &S, SourceLocation Loc, unsigned I, QualType T)
Definition: SemaDeclCXX.cpp:1074
clang::CXXRecordDecl::isEmpty
bool isEmpty() const
Determine whether this is an empty class in the sense of (C++11 [meta.unary.prop]).
Definition: DeclCXX.h:1099
clang::ClassTemplateSpecializationDecl::getTemplateArgs
const TemplateArgumentList & getTemplateArgs() const
Retrieve the template arguments of the class template specialization.
Definition: DeclTemplate.h:1890
clang::InheritedConstructor
Description of a constructor that was inherited from a base class.
Definition: DeclCXX.h:2357
IsEquivalentForUsingDecl
static bool IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2)
Determine whether a using declaration considers the given declarations as "equivalent", e.g., if they are redeclarations of the same entity or are both typedefs of the same type.
Definition: SemaDeclCXX.cpp:11176
clang::UnqualifiedId::TemplateId
TemplateIdAnnotation * TemplateId
When Kind == IK_TemplateId or IK_ConstructorTemplateId, the template-id annotation that contains the ...
Definition: DeclSpec.h:1012
clang::NamedDecl::getDeclName
DeclarationName getDeclName() const
Get the actual, stored name of the declaration, which may be a special name.
Definition: Decl.h:272
clang::DeclSpec::SCS_static
Definition: DeclSpec.h:236
clang::DeclContext::Encloses
bool Encloses(const DeclContext *DC) const
Determine whether this declaration context encloses the declaration context DC.
Definition: DeclBase.cpp:1161
clang::FunctionProtoType::ExtProtoInfo::ExtInfo
FunctionType::ExtInfo ExtInfo
Definition: Type.h:3838
clang::ClassTemplateSpecializationDecl
Represents a class template specialization, which refers to a class template with a given set of temp...
Definition: DeclTemplate.h:1802
clang::IdentifierInfo
One of these records is kept for each identifier that is lexed.
Definition: IdentifierTable.h:57
clang::Sema::CreateOverloadedBinOp
ExprResult CreateOverloadedBinOp(SourceLocation OpLoc, BinaryOperatorKind Opc, const UnresolvedSetImpl &Fns, Expr *LHS, Expr *RHS, bool RequiresADL=true, bool AllowRewrittenCandidates=true, FunctionDecl *DefaultedFn=nullptr)
Create a binary operation that may resolve to an overloaded operator.
Definition: SemaOverload.cpp:13126
clang::TargetInfo::getCXXABI
TargetCXXABI getCXXABI() const
Get the C++ ABI currently in use.
Definition: TargetInfo.h:1063
clang::LookupResult::Ambiguous
Name lookup results in an ambiguity; use getAmbiguityKind to figure out what kind of ambiguity we hav...
Definition: Lookup.h:73
clang::TemplateTypeParmDecl::getDepth
unsigned getDepth() const
Retrieve the depth of the template parameter.
Definition: DeclTemplate.cpp:642
clang::Sema::ActOnStartNamespaceDef
Decl * ActOnStartNamespaceDef(Scope *S, SourceLocation InlineLoc, SourceLocation NamespaceLoc, SourceLocation IdentLoc, IdentifierInfo *Ident, SourceLocation LBrace, const ParsedAttributesView &AttrList, UsingDirectiveDecl *&UsingDecl)
ActOnStartNamespaceDef - This is called at the start of a namespace definition.
Definition: SemaDeclCXX.cpp:10461
IsUsingDirectiveInToplevelContext
static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext)
Determine whether a using statement is in a context where it will be apply in all contexts...
Definition: SemaDeclCXX.cpp:10936
clang::Sema::ActOnNamespaceAliasDef
Decl * ActOnNamespaceAliasDef(Scope *CurScope, SourceLocation NamespaceLoc, SourceLocation AliasLoc, IdentifierInfo *Alias, CXXScopeSpec &SS, SourceLocation IdentLoc, IdentifierInfo *Ident)
Definition: SemaDeclCXX.cpp:12279
clang::CXXBasePaths::setRecordingPaths
void setRecordingPaths(bool RP)
Specify whether we should be recording paths or not.
Definition: CXXInheritance.h:215
clang::FieldDecl::getCanonicalDecl
FieldDecl * getCanonicalDecl() override
Retrieves the canonical declaration of this field.
Definition: Decl.h:2929
clang::CXXMethodDecl::isConst
bool isConst() const
Definition: DeclCXX.h:1973
clang::IdentifierInfo::isStr
bool isStr(const char(&Str)[StrLen]) const
Return true if this is the identifier for the specified string.
Definition: IdentifierTable.h:136
clang::Sema::ActOnExprStmt
StmtResult ActOnExprStmt(ExprResult Arg, bool DiscardedValue=true)
Definition: SemaStmt.cpp:45
clang::UnqualifiedId::ConversionFunctionId
UnionParsedType ConversionFunctionId
When Kind == IK_ConversionFunctionId, the type that the conversion function names.
Definition: DeclSpec.h:996
clang::ParmVarDecl::setUninstantiatedDefaultArg
void setUninstantiatedDefaultArg(Expr *arg)
Definition: Decl.cpp:2747
clang::Sema::ActOnStartFunctionDeclarationDeclarator
void ActOnStartFunctionDeclarationDeclarator(Declarator &D, unsigned TemplateParameterDepth)
Called before parsing a function declarator belonging to a function declaration.
Definition: SemaDeclCXX.cpp:17390
clang::Sema::CheckConstexprKind::Diagnose
Diagnose issues that are non-constant or that are extensions.
clang::ASTContext
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:168
clang::NestedNameSpecifierLoc
A C++ nested-name-specifier augmented with source location information.
Definition: NestedNameSpecifier.h:236
clang::NamespaceDecl::isInline
bool isInline() const
Returns true if this is an inline namespace declaration.
Definition: Decl.h:558
IIK_Move
Definition: SemaDeclCXX.cpp:4528
clang::Sema::inTemplateInstantiation
bool inTemplateInstantiation() const
Determine whether we are currently performing template instantiation.
Definition: Sema.h:8412
llvm::Optional
Definition: LLVM.h:37
clang::ClassTemplateSpecializationDecl::getSpecializationKind
TemplateSpecializationKind getSpecializationKind() const
Determine the kind of specialization that this declaration represents.
Definition: DeclTemplate.h:1896
clang::FunctionProtoType::getParamTypes
ArrayRef< QualType > getParamTypes() const
Definition: Type.h:3971
clang::DeclContextLookupResult
The results of name lookup within a DeclContext.
Definition: DeclBase.h:1195
clang::DeclSpec::getTypeSpecTypeLoc
SourceLocation getTypeSpecTypeLoc() const
Definition: DeclSpec.h:517
AR_inaccessible
Definition: SemaAccess.cpp:32
clang::TemplateArgumentLoc::getTypeSourceInfo
TypeSourceInfo * getTypeSourceInfo() const
Definition: TemplateBase.h:506
clang::FunctionDecl::getConstexprKind
ConstexprSpecKind getConstexprKind() const
Definition: Decl.h:2206
clang::ComparisonCategoryInfo::ValueInfo::VD
VarDecl * VD
Definition: ComparisonCategories.h:85
ImplicitInitializerKind
ImplicitInitializerKind
ImplicitInitializerKind - How an implicit base or member initializer should initialize its base or me...
Definition: SemaDeclCXX.cpp:4525
clang::DeclaratorChunk::Function
Definition: DeclSpec.h:1176
clang::TemplateName::getAsTemplateDecl
TemplateDecl * getAsTemplateDecl() const
Retrieve the underlying template declaration that this template name refers to, if known...
Definition: TemplateName.cpp:99
clang::CXXRecordDecl::defaultedDefaultConstructorIsConstexpr
bool defaultedDefaultConstructorIsConstexpr() const
Determine whether a defaulted default constructor for this class would be constexpr.
Definition: DeclCXX.h:1166
clang::RecordDecl::getDefinition
RecordDecl * getDefinition() const
Returns the RecordDecl that actually defines this struct/union/class.
Definition: Decl.h:3953
clang::CorrectionCandidateCallback
Base class for callback objects used by Sema::CorrectTypo to check the validity of a potential typo c...
Definition: TypoCorrection.h:281
clang::Sema::IsDerivedFrom
bool IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base)
Determine whether the type Derived is a C++ class that is derived from the type Base.
Definition: SemaDeclCXX.cpp:2744
clang::RecordDecl::fields
field_range fields() const
Definition: Decl.h:3963
clang::Sema::ActOnBaseSpecifier
BaseResult ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, ParsedAttributes &Attrs, bool Virtual, AccessSpecifier Access, ParsedType basetype, SourceLocation BaseLoc, SourceLocation EllipsisLoc)
ActOnBaseSpecifier - Parsed a base specifier.
Definition: SemaDeclCXX.cpp:2555
CollectFieldInitializer
static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, FieldDecl *Field, IndirectFieldDecl *Indirect=nullptr)
Definition: SemaDeclCXX.cpp:4880
clang::ASTContext::getDependentNameType
QualType getDependentNameType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS, const IdentifierInfo *Name, QualType Canon=QualType()) const
Definition: ASTContext.cpp:4505
clang::Stmt::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.cpp:275
clang::DeclarationName::getNameKind
NameKind getNameKind() const
Determine what kind of name this is.
Definition: DeclarationName.h:384
clang::Sema::checkExceptionSpecification
void checkExceptionSpecification(bool IsTopLevel, ExceptionSpecificationType EST, ArrayRef< ParsedType > DynamicExceptions, ArrayRef< SourceRange > DynamicExceptionRanges, Expr *NoexceptExpr, SmallVectorImpl< QualType > &Exceptions, FunctionProtoType::ExceptionSpecInfo &ESI)
Check the given exception-specification and update the exception specification information with the r...
Definition: SemaDeclCXX.cpp:17210
clang::UnqualifiedId::TemplateName
UnionParsedTemplateTy TemplateName
When Kind == IK_DeductionGuideName, the parsed template-name.
Definition: DeclSpec.h:1007
clang::Sema::BuildExceptionDeclaration
VarDecl * BuildExceptionDeclaration(Scope *S, TypeSourceInfo *TInfo, SourceLocation StartLoc, SourceLocation IdLoc, IdentifierInfo *Id)
Perform semantic analysis for the variable declaration that occurs within a C++ catch clause...
Definition: SemaDeclCXX.cpp:15400
clang::FieldDecl
Represents a member of a struct/union/class.
Definition: Decl.h:2729
clang::NestedNameSpecifier::getAsType
const Type * getAsType() const
Retrieve the type stored in this nested name specifier.
Definition: NestedNameSpecifier.h:194
clang::Sema::LookupOverloadedBinOp
void LookupOverloadedBinOp(OverloadCandidateSet &CandidateSet, OverloadedOperatorKind Op, const UnresolvedSetImpl &Fns, ArrayRef< Expr *> Args, bool RequiresADL=true)
Perform lookup for an overloaded binary operator.
Definition: SemaOverload.cpp:13040
clang::CXXCtorInitializer::getTypeSourceInfo
TypeSourceInfo * getTypeSourceInfo() const
Returns the declarator information for a base class or delegating initializer.
Definition: DeclCXX.h:2285
clang::Sema::isMemberAccessibleForDeletion
bool isMemberAccessibleForDeletion(CXXRecordDecl *NamingClass, DeclAccessPair Found, QualType ObjectType, SourceLocation Loc, const PartialDiagnostic &Diag)
Is the given member accessible for the purposes of deciding whether to define a special member functi...
Definition: SemaAccess.cpp:1565
clang::Qualifiers::removeConst
void removeConst()
Definition: Type.h:262
clang::Sema::DefaultedComparisonKind
DefaultedComparisonKind
Kinds of defaulted comparison operator functions.
Definition: Sema.h:1259
clang::Sema::isAbstractType
bool isAbstractType(SourceLocation Loc, QualType T)
Definition: SemaDeclCXX.cpp:5529
clang::UnaryOperator::isIncrementDecrementOp
static bool isIncrementDecrementOp(Opcode Op)
Definition: Expr.h:2119
clang::interp::Zero
bool Zero(InterpState &S, CodePtr OpPC)
Definition: Interp.h:812
clang::LookupResult::getLookupNameInfo
const DeclarationNameInfo & getLookupNameInfo() const
Gets the name info to look up.
Definition: Lookup.h:233
clang::Declarator::isFunctionDefinition
bool isFunctionDefinition() const
Definition: DeclSpec.h:2549
clang::FunctionProtoType::ExtProtoInfo::TypeQuals
Qualifiers TypeQuals
Definition: Type.h:3841
clang::CXXMethodDecl::getCanonicalDecl
CXXMethodDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclCXX.h:2017
clang::MemberExpr::getExprLoc
SourceLocation getExprLoc() const LLVM_READONLY
Definition: Expr.h:3031
clang::DeclarationNameInfo::setName
void setName(DeclarationName N)
setName - Sets the embedded declaration name.
Definition: DeclarationName.h:716
clang::Type::isReferenceType
bool isReferenceType() const
Definition: Type.h:6516
clang::DeclContextLookupResult::end
iterator end() const
Definition: DeclBase.h:1237
clang::Sema::getStdBadAlloc
CXXRecordDecl * getStdBadAlloc() const
Definition: SemaDeclCXX.cpp:10626
clang::CXXRecordDecl::hasTrivialMoveAssignment
bool hasTrivialMoveAssignment() const
Determine whether this class has a trivial move assignment operator (C++11 [class.copy]p25)
Definition: DeclCXX.h:1244
clang::DependentNameTypeLoc::setElaboratedKeywordLoc
void setElaboratedKeywordLoc(SourceLocation Loc)
Definition: TypeLoc.h:2155
clang::VarDecl::evaluateDestruction
bool evaluateDestruction(SmallVectorImpl< PartialDiagnosticAt > &Notes) const
Evaluate the destruction of this variable to determine if it constitutes constant destruction...
Definition: ExprConstant.cpp:13909
clang::CXXConstructorDecl::getInheritedConstructor
InheritedConstructor getInheritedConstructor() const
Get the constructor that this inheriting constructor is based on.
Definition: DeclCXX.h:2622
clang::UnresolvedSetIterator
The iterator over UnresolvedSets.
Definition: UnresolvedSet.h:32
clang::UnresolvedUsingTypenameDecl::Create
static UnresolvedUsingTypenameDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation UsingLoc, SourceLocation TypenameLoc, NestedNameSpecifierLoc QualifierLoc, SourceLocation TargetNameLoc, DeclarationName TargetName, SourceLocation EllipsisLoc)
Definition: DeclCXX.cpp:3005
extendLeft
static void extendLeft(SourceRange &R, SourceRange Before)
Definition: SemaDeclCXX.cpp:10038
clang::CXXRecordDecl::hasUserDeclaredDestructor
bool hasUserDeclaredDestructor() const
Determine whether this class has a user-declared destructor.
Definition: DeclCXX.h:943
clang::DeclarationNameTable::getCXXDestructorName
DeclarationName getCXXDestructorName(CanQualType Ty)
Returns the name of a C++ destructor for the given Type.
Definition: DeclarationName.cpp:314
clang::FunctionTypeLoc::getParam
ParmVarDecl * getParam(unsigned i) const
Definition: TypeLoc.h:1432
ScopeInfo.h
Category
int Category
Definition: Format.cpp:1828
clang::Sema::ConditionResult::isInvalid
bool isInvalid() const
Definition: Sema.h:11013
clang::Type::isSpecificBuiltinType
bool isSpecificBuiltinType(unsigned K) const
Test for a particular builtin type.
Definition: Type.h:6744
clang::DeclContext::Equals
bool Equals(const DeclContext *DC) const
Determine whether this declaration context is equivalent to the declaration context DC...
Definition: DeclBase.h:1908
clang::ASTContext::MakeIntValue
llvm::APSInt MakeIntValue(uint64_t Value, QualType Type) const
Make an APSInt of the appropriate width and signedness for the given Value and integer Type...
Definition: ASTContext.h:2699
clang::Sema::ConditionResult::get
std::pair< VarDecl *, Expr * > get() const
Definition: Sema.h:11014
clang::LookupResult::getResultKind
LookupResultKind getResultKind() const
Definition: Lookup.h:321
clang::Sema::DefineUsedVTables
bool DefineUsedVTables()
Define all of the vtables that have been used in this translation unit and reference any virtual memb...
Definition: SemaDeclCXX.cpp:16799
clang::FunctionDecl::setParams
void setParams(ArrayRef< ParmVarDecl *> NewParamInfo)
Definition: Decl.h:2430
clang::CastExpr::getSubExpr
Expr * getSubExpr()
Definition: Expr.h:3202
clang::AccessSpecDecl
Represents an access specifier followed by colon &#39;:&#39;.
Definition: DeclCXX.h:85
clang::DeclSpec::ClearStorageClassSpecs
void ClearStorageClassSpecs()
Definition: DeclSpec.h:461
clang::DeclaratorDecl::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Decl.h:723
clang::UsingDecl::addShadowDecl
void addShadowDecl(UsingShadowDecl *S)
Definition: DeclCXX.cpp:2904
clang::ComparisonCategoryResult
ComparisonCategoryResult
An enumeration representing the possible results of a three-way comparison.
Definition: ComparisonCategories.h:65
clang::Sema::CheckDeductionGuideDeclarator
void CheckDeductionGuideDeclarator(Declarator &D, QualType &R, StorageClass &SC)
Check the validity of a declarator that we parsed for a deduction-guide.
Definition: SemaDeclCXX.cpp:10303
clang::TemplateParameterList::getTemplateLoc
SourceLocation getTemplateLoc() const
Definition: DeclTemplate.h:195
clang::Sema::FinalizeVarWithDestructor
void FinalizeVarWithDestructor(VarDecl *VD, const RecordType *DeclInitType)
FinalizeVarWithDestructor - Prepare for calling destructor on the constructed variable.
Definition: SemaDeclCXX.cpp:14727
clang::Sema::CheckExtraCXXDefaultArguments
void CheckExtraCXXDefaultArguments(Declarator &D)
CheckExtraCXXDefaultArguments - Check for any extra default arguments in the declarator, which is not a function declaration or definition and therefore is not permitted to have default arguments.
Definition: SemaDeclCXX.cpp:376
clang::LookupResult::NotFoundInCurrentInstantiation
No entity found met the criteria within the current instantiation,, but there were dependent base cla...
Definition: Lookup.h:55
clang::UnqualifiedIdKind::IK_LiteralOperatorId
A user-defined literal name, e.g., operator "" _i.
llvm::SmallVectorImpl
Definition: LLVM.h:36
clang::ASTContext::Idents
IdentifierTable & Idents
Definition: ASTContext.h:580
clang::RecordDecl::field_iterator
specific_decl_iterator< FieldDecl > field_iterator
Definition: Decl.h:3960
clang::Sema::SpecialMemberOverloadResult
SpecialMemberOverloadResult - The overloading result for a special member function.
Definition: Sema.h:1131
clang::Sema::NoteDeletedFunction
void NoteDeletedFunction(FunctionDecl *FD)
Emit a note explaining that this function is deleted.
Definition: SemaExpr.cpp:100
clang::CXXRecordDecl::setImplicitCopyConstructorIsDeleted
void setImplicitCopyConstructorIsDeleted()
Set that we attempted to declare an implicit copy constructor, but overload resolution failed so we d...
Definition: DeclCXX.h:825
clang::VK_RValue
An r-value expression (a pr-value in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:125
clang::Declarator::isInvalidType
bool isInvalidType() const
Definition: DeclSpec.h:2530
clang::FunctionDecl::parameters
ArrayRef< ParmVarDecl * > parameters() const
Definition: Decl.h:2399
UnsupportedSTLSelect
UnsupportedSTLSelect
Definition: SemaDeclCXX.cpp:10656
clang::Language::CUDA
clang::Sema::ComparisonCategoryUsage::DefaultedOperator
A defaulted &#39;operator<=>&#39; needed the comparison category.
clang::LookupResult::getAsSingle
DeclClass * getAsSingle() const
Definition: Lookup.h:507
clang::Sema::FindHiddenVirtualMethods
void FindHiddenVirtualMethods(CXXMethodDecl *MD, SmallVectorImpl< CXXMethodDecl *> &OverloadedMethods)
Check if a method overloads virtual methods in a base class without overriding any.
Definition: SemaDeclCXX.cpp:9367
clang::VirtSpecifiers::isFinalSpelledSealed
bool isFinalSpelledSealed() const
Definition: DeclSpec.h:2608
clang::TypeAliasTemplateDecl::getTemplatedDecl
TypeAliasDecl * getTemplatedDecl() const
Get the underlying function declaration of the template.
Definition: DeclTemplate.h:2532
clang::ParenListExpr::Create
static ParenListExpr * Create(const ASTContext &Ctx, SourceLocation LParenLoc, ArrayRef< Expr *> Exprs, SourceLocation RParenLoc)
Create a paren list.
Definition: Expr.cpp:4497
clang::UnqualifiedId::DestructorName
UnionParsedType DestructorName
When Kind == IK_DestructorName, the type referred to by the class-name.
Definition: DeclSpec.h:1004
clang::InitListExpr
Describes an C or C++ initializer list.
Definition: Expr.h:4403
CharUnits.h
clang::UsingDecl
Represents a C++ using-declaration.
Definition: DeclCXX.h:3369
clang::RecordDecl::APK_CanPassInRegs
The argument of this type can be passed directly in registers.
Definition: Decl.h:3759
clang::DecompositionDecl::bindings
ArrayRef< BindingDecl * > bindings() const
Definition: DeclCXX.h:3903
clang::UnqualifiedId
Represents a C++ unqualified-id that has been parsed.
Definition: DeclSpec.h:960
clang::RValueReferenceType
An rvalue reference type, per C++11 [dcl.ref].
Definition: Type.h:2815
clang::Sema::isCompleteType
bool isCompleteType(SourceLocation Loc, QualType T)
Definition: Sema.h:1817
clang::NestedNameSpecifier::getAsRecordDecl
CXXRecordDecl * getAsRecordDecl() const
Retrieve the record declaration stored in this nested name specifier.
Definition: NestedNameSpecifier.cpp:184
CheckConvertedConstantExpression
static ExprResult CheckConvertedConstantExpression(Sema &S, Expr *From, QualType T, APValue &Value, Sema::CCEKind CCE, bool RequireInt)
CheckConvertedConstantExpression - Check that the expression From is a converted constant expression ...
Definition: SemaOverload.cpp:5522
clang::Sema::CXXCopyConstructor
Definition: Sema.h:1242
clang::TemplateParameterList::getMinRequiredArguments
unsigned getMinRequiredArguments() const
Returns the minimum number of arguments needed to form a template specialization. ...
Definition: DeclTemplate.cpp:101
clang::DeclSpec::TQ_unaligned
Definition: DeclSpec.h:318
clang::LookupResult::resolveKind
void resolveKind()
Resolves the result kind of the lookup, possibly hiding decls.
Definition: SemaLookup.cpp:475
clang::Sema::getOrCreateStdNamespace
NamespaceDecl * getOrCreateStdNamespace()
Retrieve the special "std" namespace, which may require us to implicitly define the namespace...
Definition: SemaDeclCXX.cpp:10793
ReferenceDllExportedMembers
static void ReferenceDllExportedMembers(Sema &S, CXXRecordDecl *Class)
Definition: SemaDeclCXX.cpp:5777
clang::LookupResult
Represents the results of name lookup.
Definition: Lookup.h:46
clang::ActionResult::get
PtrTy get() const
Definition: Ownership.h:170
clang::CXXConstructorDecl::isDelegatingConstructor
bool isDelegatingConstructor() const
Determine whether this constructor is a delegating constructor.
Definition: DeclCXX.h:2537
clang::FunctionDecl::getBody
Stmt * getBody(const FunctionDecl *&Definition) const
Retrieve the body (definition) of the function.
Definition: Decl.cpp:2894
clang::LinkageSpecDecl::lang_c
Definition: DeclCXX.h:2787
clang::DeclAccessPair::make
static DeclAccessPair make(NamedDecl *D, AccessSpecifier AS)
Definition: DeclAccessPair.h:35
clang::AS_private
Definition: Specifiers.h:116
clang::InitializedEntity::InitializeDelegation
static InitializedEntity InitializeDelegation(QualType Type)
Create the initialization entity for a delegated constructor.
Definition: Initialization.h:350
clang::TagDecl::getTagKind
TagKind getTagKind() const
Definition: Decl.h:3398
clang::Sema::BuildDeclRefExpr
DeclRefExpr * BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK, SourceLocation Loc, const CXXScopeSpec *SS=nullptr)
Definition: SemaExpr.cpp:1868
clang::EST_MSAny
Microsoft throw(...) extension.
Definition: ExceptionSpecificationType.h:24
clang::OR_Deleted
Succeeded, but refers to a deleted function.
Definition: Overload.h:62
clang::TemplateArgumentListInfo
A convenient class for passing around template argument information.
Definition: TemplateBase.h:554
clang::diff::Move
Definition: ASTDiff.h:32
clang::RecordDecl::setParamDestroyedInCallee
void setParamDestroyedInCallee(bool V)
Definition: Decl.h:3914
clang::CXXBaseSpecifier::getAccessSpecifier
AccessSpecifier getAccessSpecifier() const
Returns the access specifier for this base specifier.
Definition: DeclCXX.h:225
clang::QualType::isTriviallyCopyableType
bool isTriviallyCopyableType(const ASTContext &Context) const
Return true if this is a trivially copyable type (C++0x [basic.types]p9)
Definition: Type.cpp:2289
clang::Sema::DeclareImplicitMoveConstructor
CXXConstructorDecl * DeclareImplicitMoveConstructor(CXXRecordDecl *ClassDecl)
Declare the implicit move constructor for the given class.
Definition: SemaDeclCXX.cpp:14304
clang::Sema::checkThisInStaticMemberFunctionType
bool checkThisInStaticMemberFunctionType(CXXMethodDecl *Method)
Check whether &#39;this&#39; shows up in the type of a static member function after the (naturally empty) cv-...
Definition: SemaDeclCXX.cpp:17084
clang::FunctionDecl::setDefaultedFunctionInfo
void setDefaultedFunctionInfo(DefaultedFunctionInfo *Info)
Definition: Decl.cpp:2846
clang::FunctionTypeLoc
Wrapper for source info for functions.
Definition: TypeLoc.h:1351
clang::Sema::CheckUsingShadowDecl
bool CheckUsingShadowDecl(UsingDecl *UD, NamedDecl *Target, const LookupResult &PreviousDecls, UsingShadowDecl *&PrevShadow)
Determines whether to create a using shadow decl for a particular decl, given the set of decls existi...
Definition: SemaDeclCXX.cpp:11191
clang::CXXRecordDecl::needsOverloadResolutionForCopyAssignment
bool needsOverloadResolutionForCopyAssignment() const
Determine whether we need to eagerly declare a defaulted copy assignment operator for this class...
Definition: DeclCXX.h:882
clang::Sema::isCurrentClassNameTypo
bool isCurrentClassNameTypo(IdentifierInfo *&II, const CXXScopeSpec *SS)
Determine whether the identifier II is a typo for the name of the class type currently being defined...
Definition: SemaDeclCXX.cpp:2354
clang::FunctionDecl::getDescribedFunctionTemplate
FunctionTemplateDecl * getDescribedFunctionTemplate() const
Retrieves the function template that is described by this function declaration.
Definition: Decl.cpp:3561
clang::Sema::DefineInheritingConstructor
void DefineInheritingConstructor(SourceLocation UseLoc, CXXConstructorDecl *Constructor)
Define the specified inheriting constructor.
Definition: SemaDeclCXX.cpp:12774
clang::IndirectFieldDecl::chain
ArrayRef< NamedDecl * > chain() const
Definition: Decl.h:3002
clang::VK_XValue
An x-value expression is a reference to an object with independent storage but which can be "moved"...
Definition: Specifiers.h:134
clang::ComparisonCategoryType::First
clang::Decl::FOK_Undeclared
A friend of a previously-undeclared entity.
Definition: DeclBase.h:1104
clang::CXXRecordDecl::hasNonTrivialDestructorForCall
bool hasNonTrivialDestructorForCall() const
Definition: DeclCXX.h:1283
clang::Stmt::children
child_range children()
Definition: Stmt.cpp:224
clang::Declarator::getNumTypeObjects
unsigned getNumTypeObjects() const
Return the number of types applied to this declarator.
Definition: DeclSpec.h:2220
BuildImplicitMemberInitializer
static bool BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, ImplicitInitializerKind ImplicitInitKind, FieldDecl *Field, IndirectFieldDecl *Indirect, CXXCtorInitializer *&CXXMemberInit)
Definition: SemaDeclCXX.cpp:4616
clang::Sema::MarkDeclRefReferenced
void MarkDeclRefReferenced(DeclRefExpr *E, const Expr *Base=nullptr)
Perform reference-marking and odr-use handling for a DeclRefExpr.
Definition: SemaExpr.cpp:17031
clang::AttributeCommonInfo::AS_Keyword
__ptr16, alignas(...), etc.
Definition: AttributeCommonInfo.h:42
clang::StmtError
StmtResult StmtError()
Definition: Ownership.h:280
clang::ASTContext::getPrintingPolicy
const clang::PrintingPolicy & getPrintingPolicy() const
Definition: ASTContext.h:671
clang::Type::containsUnexpandedParameterPack
bool containsUnexpandedParameterPack() const
Whether this type is or contains an unexpanded parameter pack, used to support C++0x variadic templat...
Definition: Type.h:1896
NoteIndirectBases
static void NoteIndirectBases(ASTContext &Context, IndirectBaseSet &Set, const QualType &Type)
Recursively add the bases of Type. Don&#39;t add Type itself.
Definition: SemaDeclCXX.cpp:2606
clang::PseudoObjectExpr::semantics_end
semantics_iterator semantics_end()
Definition: Expr.h:5789
clang::Sema::ActOnBaseSpecifiers
void ActOnBaseSpecifiers(Decl *ClassDecl, MutableArrayRef< CXXBaseSpecifier *> Bases)
ActOnBaseSpecifiers - Attach the given base specifiers to the class, after checking whether there are...
Definition: SemaDeclCXX.cpp:2733
clang::TypeDecl
Represents a declaration of a type.
Definition: Decl.h:3029
clang::BinaryOperator
A builtin binary operation expression such as "x + y" or "x <= y".
Definition: Expr.h:3434
clang::QualType::isVolatileQualified
bool isVolatileQualified() const
Determine whether this type is volatile-qualified.
Definition: Type.h:6326
clang::LookupResult::Filter::done
void done()
Definition: Lookup.h:672
AR_accessible
Definition: SemaAccess.cpp:31
clang::Qualifiers::getAddressSpace
LangAS getAddressSpace() const
Definition: Type.h:359
clang::UnresolvedSetImpl
A set of unresolved declarations.
Definition: UnresolvedSet.h:61
clang::DeclaratorChunk::Pipe
Definition: DeclSpec.h:1176
clang::Sema::CodeSynthesisContext::PointOfInstantiation
SourceLocation PointOfInstantiation
The point of instantiation or synthesis within the source code.
Definition: Sema.h:8082
clang::CompoundStmt::Create
static CompoundStmt * Create(const ASTContext &C, ArrayRef< Stmt *> Stmts, SourceLocation LB, SourceLocation RB)
Definition: Stmt.cpp:319
clang::Sema::CheckDelegatingCtorCycles
void CheckDelegatingCtorCycles()
Definition: SemaDeclCXX.cpp:17055
clang::ASTContext::getExceptionObjectType
QualType getExceptionObjectType(QualType T) const
Definition: ASTContext.cpp:5781
clang::Sema::CheckDestructorDeclarator
QualType CheckDestructorDeclarator(Declarator &D, QualType R, StorageClass &SC)
CheckDestructorDeclarator - Called by ActOnDeclarator to check the well-formednes of the destructor d...
Definition: SemaDeclCXX.cpp:9938
clang::MultiTemplateParamsArg
MutableArrayRef< TemplateParameterList * > MultiTemplateParamsArg
Definition: Ownership.h:277
clang::CXXScopeSpec::clear
void clear()
Definition: DeclSpec.h:211
clang::Type::isRValueReferenceType
bool isRValueReferenceType() const
Definition: Type.h:6524
checkMoveAssignmentForRepeatedMove
static void checkMoveAssignmentForRepeatedMove(Sema &S, CXXRecordDecl *Class, SourceLocation CurrentLocation)
Check if we&#39;re implicitly defining a move assignment operator for a class with virtual bases...
Definition: SemaDeclCXX.cpp:13873
clang::TypeLoc::isNull
bool isNull() const
Definition: TypeLoc.h:120
clang::InitListExpr::children
child_range children()
Definition: Expr.h:4588
clang::CXXConstructorDecl::inits
init_range inits()
Definition: DeclCXX.h:2475
clang::VarDecl::setExceptionVariable
void setExceptionVariable(bool EV)
Definition: Decl.h:1340
clang::RecordDecl::APK_CanNeverPassInRegs
The argument of this type cannot be passed directly in registers.
Definition: Decl.h:3773
clang::TargetInfo::CallingConvKind
CallingConvKind
Definition: TargetInfo.h:1303
Error
llvm::Error Error
Definition: ByteCodeEmitter.cpp:19
clang::VarDecl::isConstexpr
bool isConstexpr() const
Whether this variable is (C++11) constexpr.
Definition: Decl.h:1412
clang::TypeResult
ActionResult< ParsedType > TypeResult
Definition: Ownership.h:265
clang::DeclContextLookupResult::slice
DeclContextLookupResult slice(size_t N) const
Definition: DeclBase.h:1247
clang::CXXRecordDecl::isLambda
bool isLambda() const
Determine whether this class describes a lambda function object.
Definition: DeclCXX.h:960
clang::ASTContext::LongDoubleTy
CanQualType LongDoubleTy
Definition: ASTContext.h:1028
clang::Scope
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:40
clang::InitializationSequence::Perform
ExprResult Perform(Sema &S, const InitializedEntity &Entity, const InitializationKind &Kind, MultiExprArg Args, QualType *ResultType=nullptr)
Perform the actual initialization of the given entity based on the computed initialization sequence...
Definition: SemaInit.cpp:7750
clang::Sema::SetParamDefaultArgument
bool SetParamDefaultArgument(ParmVarDecl *Param, Expr *DefaultArg, SourceLocation EqualLoc)
Definition: SemaDeclCXX.cpp:250
clang::QualType::getTypePtr
const Type * getTypePtr() const
Retrieves a pointer to the underlying (unqualified) type.
Definition: Type.h:6256
clang::CXXRecordDecl::getCanonicalDecl
CXXRecordDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclCXX.h:492
clang::RecordDecl::field_begin
field_iterator field_begin() const
Definition: Decl.cpp:4425
clang::CXXMethodDecl::Create
static CXXMethodDecl * Create(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo, StorageClass SC, bool isInline, ConstexprSpecKind ConstexprKind, SourceLocation EndLocation, Expr *TrailingRequiresClause=nullptr)
Definition: DeclCXX.cpp:2054
clang::declaresSameEntity
bool declaresSameEntity(const Decl *D1, const Decl *D2)
Determine whether two declarations declare the same entity.
Definition: DeclBase.h:1166
clang::ParmVarDecl::hasUnparsedDefaultArg
bool hasUnparsedDefaultArg() const
Determines whether this parameter has a default argument that has not yet been parsed.
Definition: Decl.h:1709
clang::Sema::CheckConstexprKind::CheckValid
Identify whether this function satisfies the formal rules for constexpr functions in the current lanu...
clang::Sema::CheckBaseSpecifier
CXXBaseSpecifier * CheckBaseSpecifier(CXXRecordDecl *Class, SourceRange SpecifierRange, bool Virtual, AccessSpecifier Access, TypeSourceInfo *TInfo, SourceLocation EllipsisLoc)
ActOnBaseSpecifier - Parsed a base specifier.
Definition: SemaDeclCXX.cpp:2414
clang::FunctionDecl::setTrivial
void setTrivial(bool IT)
Definition: Decl.h:2123
clang::Sema::EvaluateImplicitExceptionSpec
void EvaluateImplicitExceptionSpec(SourceLocation Loc, FunctionDecl *FD)
Evaluate the implicit exception specification for a defaulted special member function.
Definition: SemaDeclCXX.cpp:6902
clang::Sema::ActOnCXXThis
ExprResult ActOnCXXThis(SourceLocation loc)
Definition: SemaExprCXX.cpp:1258
clang::ParenListExpr
Definition: Expr.h:5143
clang::CXXCtorInitializer::isAnyMemberInitializer
bool isAnyMemberInitializer() const
Definition: DeclCXX.h:2232
clang::CXXScopeSpec
Represents a C++ nested-name-specifier or a global scope specifier.
Definition: DeclSpec.h:63
clang::CXXConstructorDecl::setNumCtorInitializers
void setNumCtorInitializers(unsigned numCtorInitializers)
Definition: DeclCXX.h:2523
clang::Decl::getLexicalDeclContext
DeclContext * getLexicalDeclContext()
getLexicalDeclContext - The declaration context where this Decl was lexically declared (LexicalDC)...
Definition: DeclBase.h:828
clang::CXXCtorInitializer::getAnyMember
FieldDecl * getAnyMember() const
Definition: DeclCXX.h:2297
clang::LambdaExpr
A C++ lambda expression, which produces a function object (of unspecified type) that can be invoked l...
Definition: ExprCXX.h:1818
clang::Sema::PP
Preprocessor & PP
Definition: Sema.h:384
clang::CXXRecordDecl::hasTrivialDestructor
bool hasTrivialDestructor() const
Determine whether this class has a trivial destructor (C++ [class.dtor]p3)
Definition: DeclCXX.h:1269
clang::VarDecl::Create
static VarDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, SourceLocation IdLoc, IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, StorageClass S)
Definition: Decl.cpp:1980
clang::Sema::getLangOpts
const LangOptions & getLangOpts() const
Definition: Sema.h:1324
clang::NamespaceAliasDecl::Create
static NamespaceAliasDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation NamespaceLoc, SourceLocation AliasLoc, IdentifierInfo *Alias, NestedNameSpecifierLoc QualifierLoc, SourceLocation IdentLoc, NamedDecl *Namespace)
Definition: DeclCXX.cpp:2802
clang::IntegerLiteral::Create
static IntegerLiteral * Create(const ASTContext &C, const llvm::APInt &V, QualType type, SourceLocation l)
Returns a new integer literal with value &#39;V&#39; and type &#39;type&#39;.
Definition: Expr.cpp:928
clang::TemplateSpecializationTypeLoc::getArgLoc
TemplateArgumentLoc getArgLoc(unsigned i) const
Definition: TypeLoc.h:1616
clang::Sema::AdjustDestructorExceptionSpec
void AdjustDestructorExceptionSpec(CXXDestructorDecl *Destructor)
Build an exception spec for destructors that don&#39;t have one.
Definition: SemaDeclCXX.cpp:13007
clang::CXXMethodDecl::isInstance
bool isInstance() const
Definition: DeclCXX.h:1959
clang::DeclSpec::getConstSpecLoc
SourceLocation getConstSpecLoc() const
Definition: DeclSpec.h:551
clang::Expr::isTypeDependent
bool isTypeDependent() const
isTypeDependent - Determines whether this expression is type-dependent (C++ [temp.dep.expr]), which means that its type could change from one template instantiation to the next.
Definition: Expr.h:176
clang::Sema::CheckExplicitlyDefaultedSpecialMember
bool CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM)
Definition: SemaDeclCXX.cpp:6931
clang::Declarator::getCXXScopeSpec
const CXXScopeSpec & getCXXScopeSpec() const
getCXXScopeSpec - Return the C++ scope specifier (global scope or nested-name-specifier) that is part...
Definition: DeclSpec.h:1910
findCircularInheritance
static bool findCircularInheritance(const CXXRecordDecl *Class, const CXXRecordDecl *Current)
Determine whether the given class is a base class of the given class, including looking at dependent ...
Definition: SemaDeclCXX.cpp:2379
clang::TemplateArgumentList::data
const TemplateArgument * data() const
Retrieve a pointer to the template argument list.
Definition: DeclTemplate.h:302
clang::OK_Ordinary
An ordinary object is located at an address in memory.
Definition: Specifiers.h:141
clang::CPlusPlus2a
Definition: LangStandard.h:51
clang::interp::Const
bool Const(InterpState &S, CodePtr OpPC, const T &Arg)
Definition: Interp.h:294
clang::RecursiveASTVisitor
A class that does preorder or postorder depth-first traversal on the entire Clang AST and visits each...
Definition: RecursiveASTVisitor.h:151
clang::CXXRecordDecl::getDestructor
CXXDestructorDecl * getDestructor() const
Returns the destructor decl for this class.
Definition: DeclCXX.cpp:1770
clang::Sema::ActOnStartLinkageSpecification
Decl * ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, Expr *LangStr, SourceLocation LBraceLoc)
ActOnStartLinkageSpecification - Parsed the beginning of a C++ linkage specification, including the language and (if present) the &#39;{&#39;.
Definition: SemaDeclCXX.cpp:15338
clang::EST_BasicNoexcept
noexcept
Definition: ExceptionSpecificationType.h:26
clang::DeclaratorChunk::FunctionTypeInfo
Definition: DeclSpec.h:1275
clang::ObjCInterfaceDecl
Represents an ObjC class declaration.
Definition: DeclObjC.h:1186
clang::ComparisonCategoryInfo::getValueInfo
const ValueInfo * getValueInfo(ComparisonCategoryResult ValueKind) const
Definition: ComparisonCategories.h:126
clang::CXXCtorInitializer::getMember
FieldDecl * getMember() const
If this is a member initializer, returns the declaration of the non-static data member being initiali...
Definition: DeclCXX.h:2291
clang::LinkageSpecDecl
Represents a linkage specification.
Definition: DeclCXX.h:2778
clang::Sema::BuildMemberReferenceExpr
ExprResult BuildMemberReferenceExpr(Expr *Base, QualType BaseType, SourceLocation OpLoc, bool IsArrow, CXXScopeSpec &SS, SourceLocation TemplateKWLoc, NamedDecl *FirstQualifierInScope, const DeclarationNameInfo &NameInfo, const TemplateArgumentListInfo *TemplateArgs, const Scope *S, ActOnMemberAccessExtraArgs *ExtraArgs=nullptr)
Definition: SemaExprMember.cpp:744
clang::LookupResult::addDecl
void addDecl(NamedDecl *D)
Add a declaration to these results with its natural access.
Definition: Lookup.h:426
clang::ComparisonCategories::getInfoForType
const ComparisonCategoryInfo & getInfoForType(QualType Ty) const
Return the comparison category information as specified by getCategoryForType(Ty).
Definition: ComparisonCategories.cpp:159
llvm::ArrayRef
Definition: LLVM.h:31
clang::Sema::LookupMemberName
Member name lookup, which finds the names of class/struct/union members.
Definition: Sema.h:3443
clang::DeclarationNameInfo::containsUnexpandedParameterPack
bool containsUnexpandedParameterPack() const
Determine whether this name contains an unexpanded parameter pack.
Definition: DeclarationName.cpp:402
clang::CXXRecordDecl::hasConstexprDefaultConstructor
bool hasConstexprDefaultConstructor() const
Determine whether this class has a constexpr default constructor.
Definition: DeclCXX.h:1173
clang::ClassTemplateDecl::getTemplatedDecl
CXXRecordDecl * getTemplatedDecl() const
Get the underlying class declarations of the template.
Definition: DeclTemplate.h:2286
clang::DeclSpec::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
Definition: DeclSpec.h:509
clang::CXXRecordDecl::isAbstract
bool isAbstract() const
Determine whether this class has a pure virtual function.
Definition: DeclCXX.h:1124
clang::Sema::ActOnFinishCXXMemberSpecification
void ActOnFinishCXXMemberSpecification(Scope *S, SourceLocation RLoc, Decl *TagDecl, SourceLocation LBrac, SourceLocation RBrac, const ParsedAttributesView &AttrList)
Definition: SemaDeclCXX.cpp:9469
llvm::SmallString< 128 >
clang::Sema::BuildDeclarationNameExpr
ExprResult BuildDeclarationNameExpr(const CXXScopeSpec &SS, LookupResult &R, bool NeedsADL, bool AcceptInvalidDecl=false)
Definition: SemaExpr.cpp:3036
clang::CanQual::getTypePtr
const T * getTypePtr() const
Retrieve the underlying type pointer, which refers to a canonical type.
Definition: CanonicalType.h:83
clang::UnresolvedLookupExpr::Create
static UnresolvedLookupExpr * Create(const ASTContext &Context, CXXRecordDecl *NamingClass, NestedNameSpecifierLoc QualifierLoc, const DeclarationNameInfo &NameInfo, bool RequiresADL, bool Overloaded, UnresolvedSetIterator Begin, UnresolvedSetIterator End)
Definition: ExprCXX.cpp:404
clang::FunctionProtoType::ExceptionSpecInfo::SourceDecl
FunctionDecl * SourceDecl
The function whose exception specification this is, for EST_Unevaluated and EST_Uninstantiated.
Definition: Type.h:3823
clang::Sema::checkInitializerLifetime
void checkInitializerLifetime(const InitializedEntity &Entity, Expr *Init)
Check that the lifetime of the initializer (and its subobjects) is sufficient for initializing the en...
Definition: SemaInit.cpp:7323
clang::TemplateSpecializationTypeLoc::getNumArgs
unsigned getNumArgs() const
Definition: TypeLoc.h:1604
clang::BindingDecl
A binding in a decomposition declaration.
Definition: DeclCXX.h:3812
ASTMutationListener.h
clang::Sema::ExpressionEvaluationContext::ConstantEvaluated
The current context is "potentially evaluated" in C++11 terms, but the expression is evaluated at com...
clang::CXXScopeSpec::getWithLocInContext
NestedNameSpecifierLoc getWithLocInContext(ASTContext &Context) const
Retrieve a nested-name-specifier with location information, copied into the given AST context...
Definition: DeclSpec.cpp:142
clang::ExplicitSpecifier::setKind
void setKind(ExplicitSpecKind Kind)
Definition: DeclCXX.h:1820
clang::Qualifiers::hasConst
bool hasConst() const
Definition: Type.h:260
clang::CXXConstructorDecl::init_begin
init_iterator init_begin()
Retrieve an iterator to the first initializer.
Definition: DeclCXX.h:2481
clang::Declarator::getIdentifier
IdentifierInfo * getIdentifier() const
Definition: DeclSpec.h:2172
clang::Sema::MarkVariableReferenced
void MarkVariableReferenced(SourceLocation Loc, VarDecl *Var)
Mark a variable referenced, and check whether it is odr-used (C++ [basic.def.odr]p2, C99 6.9p3).
Definition: SemaExpr.cpp:16992
clang::Decl::IDNS_Ordinary
Ordinary names.
Definition: DeclBase.h:146
clang::IdentifierInfo::getLength
unsigned getLength() const
Efficiently return the length of this identifier info.
Definition: IdentifierTable.h:152
CheckLiteralType
static bool CheckLiteralType(Sema &SemaRef, Sema::CheckConstexprKind Kind, SourceLocation Loc, QualType T, unsigned DiagID, Ts &&...DiagArgs)
Check that the given type is a literal type.
Definition: SemaDeclCXX.cpp:1582
Template.h
clang::Decl::getCanonicalDecl
virtual Decl * getCanonicalDecl()
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclBase.h:877
clang::UnqualifiedIdKind::IK_Identifier
An identifier.
clang::Sema::getTrivialTemplateArgumentLoc
TemplateArgumentLoc getTrivialTemplateArgumentLoc(const TemplateArgument &Arg, QualType NTTPType, SourceLocation Loc)
Allocate a TemplateArgumentLoc where all locations have been initialized to the given location...
Definition: SemaTemplateDeduction.cpp:2455
clang::AttributeCommonInfo::UnknownAttribute
Definition: AttributeCommonInfo.h:58
CXXFieldCollector.h
clang::CXXConstructExpr::CK_Complete
Definition: ExprCXX.h:1427
clang::prec::Assignment
Definition: OperatorPrecedence.h:29
getTrivialIntegralTemplateArgument
static TemplateArgumentLoc getTrivialIntegralTemplateArgument(Sema &S, SourceLocation Loc, QualType T, uint64_t I)
Definition: SemaDeclCXX.cpp:1016
clang::RecordDecl::getArgPassingRestrictions
ArgPassingKind getArgPassingRestrictions() const
Definition: Decl.h:3902
clang::ASTContext::getDefaultCallingConvention
CallingConv getDefaultCallingConvention(bool IsVariadic, bool IsCXXMethod, bool IsBuiltin=false) const
Retrieves the default calling convention for the current target.
Definition: ASTContext.cpp:10282
clang::Sema::SpecialMemberIsTrivial
bool SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, TrivialABIHandling TAH=TAH_IgnoreTrivialABI, bool Diagnose=false)
Determine whether a defaulted or deleted special member function is trivial, as specified in C++11 [c...
Definition: SemaDeclCXX.cpp:9150
clang::RecordDecl::isAnonymousStructOrUnion
bool isAnonymousStructOrUnion() const
Whether this is an anonymous struct or union.
Definition: Decl.h:3821
clang::FunctionDecl::param_begin
param_iterator param_begin()
Definition: Decl.h:2411
clang::ExplicitSpecKind::ResolvedTrue
clang::CXXThisExpr
Represents the this expression in C++.
Definition: ExprCXX.h:1097
clang::Sema::BuildUsingShadowDecl
UsingShadowDecl * BuildUsingShadowDecl(Scope *S, UsingDecl *UD, NamedDecl *Target, UsingShadowDecl *PrevDecl)
Builds a shadow declaration corresponding to a &#39;using&#39; declaration.
Definition: SemaDeclCXX.cpp:11359
clang::LambdaExpr::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: ExprCXX.h:2034
clang::Language
Language
The language for the input, used to select and validate the language standard and possible actions...
Definition: LangStandard.h:19
clang::StringLiteralParser::isValidUDSuffix
static bool isValidUDSuffix(const LangOptions &LangOpts, StringRef Suffix)
Determine whether a suffix is a valid ud-suffix.
Definition: LiteralSupport.cpp:1896
clang::AS_none
Definition: Specifiers.h:117
clang::DeclContext::lookup
lookup_result lookup(DeclarationName Name) const
lookup - Find the declarations (if any) with the given Name in this context.
Definition: DeclBase.cpp:1612
clang::NestedNameSpecifierLocBuilder
Class that aids in the construction of nested-name-specifiers along with source-location information ...
Definition: NestedNameSpecifier.h:349
clang::FunctionType::ExtInfo::withCallingConv
ExtInfo withCallingConv(CallingConv cc) const
Definition: Type.h:3638
buildSingleCopyAssign
static StmtResult buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, const ExprBuilder &To, const ExprBuilder &From, bool CopyingBaseSubobject, bool Copying)
Definition: SemaDeclCXX.cpp:13444
clang::TemplateIdAnnotation::LAngleLoc
SourceLocation LAngleLoc
The location of the &#39;<&#39; before the template argument list.
Definition: ParsedTemplate.h:177
clang::ComparisonCategoryType::StrongOrdering
clang::FieldDecl::removeInClassInitializer
void removeInClassInitializer()
Remove the C++11 in-class initializer from this member.
Definition: Decl.h:2895
clang::FunctionDecl::getDefaultedFunctionInfo
DefaultedFunctionInfo * getDefaultedFunctionInfo() const
Definition: Decl.cpp:2855
clang::FunctionDecl::getPrimaryTemplate
FunctionTemplateDecl * getPrimaryTemplate() const
Retrieve the primary template that this function template specialization either specializes or was in...
Definition: Decl.cpp:3653
canPassInRegisters
static bool canPassInRegisters(Sema &S, CXXRecordDecl *D, TargetInfo::CallingConvKind CCK)
Determine whether a type is permitted to be passed or returned in registers, per C++ [class...
Definition: SemaDeclCXX.cpp:6204
clang::Sema::getDiagnostics
DiagnosticsEngine & getDiagnostics() const
Definition: Sema.h:1328
checkArrayDecomposition
static bool checkArrayDecomposition(Sema &S, ArrayRef< BindingDecl *> Bindings, ValueDecl *Src, QualType DecompType, const ConstantArrayType *CAT)
Definition: SemaDeclCXX.cpp:914
clang::Sema::DefaultedFunctionKind::asSpecialMember
CXXSpecialMember asSpecialMember() const
Definition: Sema.h:2633
clang::CXXConstructorDecl::Create
static CXXConstructorDecl * Create(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo, ExplicitSpecifier ES, bool isInline, bool isImplicitlyDeclared, ConstexprSpecKind ConstexprKind, InheritedConstructor Inherited=InheritedConstructor(), Expr *TrailingRequiresClause=nullptr)
Definition: DeclCXX.cpp:2489
clang::VirtSpecifiers::isFinalSpecified
bool isFinalSpecified() const
Definition: DeclSpec.h:2607
clang::Sema::ActOnCXXExitDeclInitializer
void ActOnCXXExitDeclInitializer(Scope *S, Decl *Dcl)
ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an initializer for the declaratio...
Definition: SemaDeclCXX.cpp:16677
clang::Sema::DiagnoseDeletedDefaultedFunction
void DiagnoseDeletedDefaultedFunction(FunctionDecl *FD)
Produce notes explaining why a defaulted function was defined as deleted.
Definition: SemaDeclCXX.cpp:8854
clang::Sema::CXXSpecialMember
CXXSpecialMember
Kinds of C++ special members.
Definition: Sema.h:1240
Parent
NodeId Parent
Definition: ASTDiff.cpp:191
clang::Scope::getFlags
unsigned getFlags() const
getFlags - Return the flags for this scope.
Definition: Scope.h:220
clang::Sema::CheckTemplateIdType
QualType CheckTemplateIdType(TemplateName Template, SourceLocation TemplateLoc, TemplateArgumentListInfo &TemplateArgs)
Definition: SemaTemplate.cpp:3407
clang::Sema::BuildMemInitializer
MemInitResult BuildMemInitializer(Decl *ConstructorD, Scope *S, CXXScopeSpec &SS, IdentifierInfo *MemberOrBase, ParsedType TemplateTypeTy, const DeclSpec &DS, SourceLocation IdLoc, Expr *Init, SourceLocation EllipsisLoc)
Handle a C++ member initializer.
Definition: SemaDeclCXX.cpp:4073
clang::FunctionDecl::getDeclaredReturnType
QualType getDeclaredReturnType() const
Get the declared return type, which may differ from the actual return type if the return type is dedu...
Definition: Decl.h:2462
clang::Sema::findInheritingConstructor
CXXConstructorDecl * findInheritingConstructor(SourceLocation Loc, CXXConstructorDecl *BaseCtor, ConstructorUsingShadowDecl *DerivedShadow)
Given a derived-class using shadow declaration for a constructor and the correspnding base class cons...
Definition: SemaDeclCXX.cpp:12685
clang::driver::tools::arm::ReadTPMode::Invalid
clang::ASTContext::adjustDeducedFunctionResultType
void adjustDeducedFunctionResultType(FunctionDecl *FD, QualType ResultType)
Change the result type of a function type once it is deduced.
Definition: ASTContext.cpp:2965
clang::CXXRecordDecl::setBases
void setBases(CXXBaseSpecifier const *const *Bases, unsigned NumBases)
Sets the base classes of this struct or class.
Definition: DeclCXX.cpp:187
clang::ParsedAttr::isDeclspecPropertyAttribute
bool isDeclspecPropertyAttribute() const
Is this the Microsoft __declspec(property) attribute?
Definition: ParsedAttr.h:340
clang::Decl::hasAttr
bool hasAttr() const
Definition: DeclBase.h:542
clang::CXXConstructorDecl::getCanonicalDecl
CXXConstructorDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclCXX.h:2627
clang::CXXRecordDecl::hasUserProvidedDefaultConstructor
bool hasUserProvidedDefaultConstructor() const
Whether this class has a user-provided default constructor per C++11.
Definition: DeclCXX.h:753
clang::ConditionalOperator
ConditionalOperator - The ?: ternary operator.
Definition: Expr.h:3732
clang::Declarator::getMutableDeclSpec
DeclSpec & getMutableDeclSpec()
getMutableDeclSpec - Return a non-const version of the DeclSpec.
Definition: DeclSpec.h:1902
clang::CXXRecordDecl::isTriviallyCopyable
bool isTriviallyCopyable() const
Determine whether this class is considered trivially copyable per (C++11 [class]p6).
Definition: DeclCXX.cpp:550
clang::Sema
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:336
clang::StringLiteral::getString
StringRef getString() const
Definition: Expr.h:1794
clang::TypeAliasDecl
Represents the declaration of a typedef-name via a C++11 alias-declaration.
Definition: Decl.h:3193
clang::Sema::IsOverload
bool IsOverload(FunctionDecl *New, FunctionDecl *Old, bool IsForUsingDecl, bool ConsiderCudaAttrs=true, bool ConsiderRequiresClauses=true)
Definition: SemaOverload.cpp:1139
clang::CompoundStmt
CompoundStmt - This represents a group of statements like { stmt stmt }.
Definition: Stmt.h:1332
clang::Type::getAsCXXRecordDecl
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1690
clang::DeclSpec::getUnalignedSpecLoc
SourceLocation getUnalignedSpecLoc() const
Definition: DeclSpec.h:555
clang::FunctionProtoType
Represents a prototype with parameter type info, e.g.
Definition: Type.h:3754
clang::TargetInfo::getCallingConvKind
virtual CallingConvKind getCallingConvKind(bool ClangABICompat4) const
Definition: TargetInfo.cpp:415
clang::CXXScopeSpec::MakeTrivial
void MakeTrivial(ASTContext &Context, NestedNameSpecifier *Qualifier, SourceRange R)
Make a new nested-name-specifier from incomplete source-location information.
Definition: DeclSpec.cpp:118
clang::DeclSpec::hasConstexprSpecifier
bool hasConstexprSpecifier() const
Definition: DeclSpec.h:751
clang::CXXRecordDecl::isDynamicClass
bool isDynamicClass() const
Definition: DeclCXX.h:553
clang::DeclSpec::ClearConstexprSpec
void ClearConstexprSpec()
Definition: DeclSpec.h:755
clang::FunctionDecl::setImplicitlyInline
void setImplicitlyInline(bool I=true)
Flag that this function is implicitly inline.
Definition: Decl.h:2508
clang::Sema::CreateBuiltinBinOp
ExprResult CreateBuiltinBinOp(SourceLocation OpLoc, BinaryOperatorKind Opc, Expr *LHSExpr, Expr *RHSExpr)
CreateBuiltinBinOp - Creates a new built-in binary operation with operator Opc at location TokLoc...
Definition: SemaExpr.cpp:12920
clang::UnqualifiedId::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: DeclSpec.h:1163
clang::Sema::ActOnFinishCXXMemberDecls
void ActOnFinishCXXMemberDecls()
Perform any semantic analysis which needs to be delayed until all pending class member declarations h...
Definition: SemaDeclCXX.cpp:12965
clang::FunctionDecl::getOverloadedOperator
OverloadedOperatorKind getOverloadedOperator() const
getOverloadedOperator - Which C++ overloaded operator this function represents, if any...
Definition: Decl.cpp:3501
clang::CXXConstructExpr::getConstructor
CXXConstructorDecl * getConstructor() const
Get the constructor that this expression will (ultimately) call.
Definition: ExprCXX.h:1494
clang::Sema::DefineImplicitCopyAssignment
void DefineImplicitCopyAssignment(SourceLocation CurrentLocation, CXXMethodDecl *MethodDecl)
Defines an implicitly-declared copy assignment operator.
Definition: SemaDeclCXX.cpp:13588
clang::Declarator::isDeclarationOfFunction
bool isDeclarationOfFunction() const
Determine whether the declaration that will be produced from this declaration will be a function...
Definition: DeclSpec.cpp:312
clang::Sema::CompoundScopeRAII
A RAII object to enter scope of a compound statement.
Definition: Sema.h:4114
clang::QualType::isMoreQualifiedThan
bool isMoreQualifiedThan(QualType Other) const
Determine whether this type is more qualified than the other given type, requiring exact equality for...
Definition: Type.h:6423
clang::Sema::isStdInitializerList
bool isStdInitializerList(QualType Ty, QualType *Element)
Tests whether Ty is an instance of std::initializer_list and, if it is and Element is not NULL...
Definition: SemaDeclCXX.cpp:10808
clang::CXXRecordDecl::getTemplateSpecializationKind
TemplateSpecializationKind getTemplateSpecializationKind() const
Determine whether this particular class is a specialization or instantiation of a class template or m...
Definition: DeclCXX.cpp:1700
clang::DeclaratorDecl
Represents a ValueDecl that came out of a declarator.
Definition: Decl.h:671
clang::Sema::getSpecialMember
CXXSpecialMember getSpecialMember(const CXXMethodDecl *MD)
Definition: Sema.h:2648
clang::TypeLoc::getLocalSourceRange
SourceRange getLocalSourceRange() const
Get the local source range.
Definition: TypeLoc.h:158
clang::ComparisonCategories::getCategoryString
static StringRef getCategoryString(ComparisonCategoryType Kind)
Definition: ComparisonCategories.cpp:170
ComputeDefaultedSpecialMemberExceptionSpec
static Sema::ImplicitExceptionSpecification ComputeDefaultedSpecialMemberExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM, Sema::InheritedConstructorInfo *ICI)
Definition: SemaDeclCXX.cpp:12454
clang::CXXCtorInitializer::isDelegatingInitializer
bool isDelegatingInitializer() const
Determine whether this initializer is creating a delegating constructor.
Definition: DeclCXX.h:2252
clang::ImplicitCastExpr::Create
static ImplicitCastExpr * Create(const ASTContext &Context, QualType T, CastKind Kind, Expr *Operand, const CXXCastPath *BasePath, ExprValueKind Cat)
Definition: Expr.cpp:1993
clang::Sema::BuildReturnStmt
StmtResult BuildReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp)
Definition: SemaStmt.cpp:3601
clang::CXXConstructorDecl::getExplicitSpecifier
ExplicitSpecifier getExplicitSpecifier()
Definition: DeclCXX.h:2456
clang::Sema::AbstractReturnType
Definition: Sema.h:6795
clang::DeclaratorChunk::FunctionTypeInfo::MethodQualifiers
DeclSpec * MethodQualifiers
DeclSpec for the function with the qualifier related info.
Definition: DeclSpec.h:1342
clang::Sema::ActOnExplicitBoolSpecifier
ExplicitSpecifier ActOnExplicitBoolSpecifier(Expr *E)
ActOnExplicitBoolSpecifier - Build an ExplicitSpecifier from an expression found in an explicit(bool)...
Definition: SemaDeclCXX.cpp:12446
clang::ASTContext::DeclarationNames
DeclarationNameTable DeclarationNames
Definition: ASTContext.h:583
clang::DeclaratorChunk::FunctionTypeInfo::NumParams
unsigned NumParams
NumParams - This is the number of formal parameters specified by the declarator.
Definition: DeclSpec.h:1314
clang::Sema::SpecialMemberCache
llvm::FoldingSet< SpecialMemberOverloadResultEntry > SpecialMemberCache
A cache of special member function overload resolution results for C++ records.
Definition: Sema.h:1165
clang::CXXRecordDecl::hasTrivialMoveConstructorForCall
bool hasTrivialMoveConstructorForCall() const
Definition: DeclCXX.h:1209
clang::QualType::hasQualifiers
bool hasQualifiers() const
Determine whether this type has any qualifiers.
Definition: Type.h:6331
clang::Sema::NoteHiddenVirtualMethods
void NoteHiddenVirtualMethods(CXXMethodDecl *MD, SmallVectorImpl< CXXMethodDecl *> &OverloadedMethods)
Definition: SemaDeclCXX.cpp:9395
clang::Declarator::mayHaveDecompositionDeclarator
bool mayHaveDecompositionDeclarator() const
Return true if the context permits a C++17 decomposition declarator.
Definition: DeclSpec.h:2055
clang::EmptyDecl::Create
static EmptyDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation L)
Definition: Decl.cpp:4898
clang::UnqualifiedIdKind::IK_ConversionFunctionId
A conversion function name, e.g., operator int.
clang::CXXScopeSpec::getRange
SourceRange getRange() const
Definition: DeclSpec.h:68
clang::CharUnits::getQuantity
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:179
clang::VarDecl::isInlineSpecified
bool isInlineSpecified() const
Definition: Decl.h:1397
clang::ConstraintSatisfaction
The result of a constraint satisfaction check, containing the necessary information to diagnose an un...
Definition: ASTConcept.h:29
clang::ASTContext::getTrivialTypeSourceInfo
TypeSourceInfo * getTrivialTypeSourceInfo(QualType T, SourceLocation Loc=SourceLocation()) const
Allocate a TypeSourceInfo where all locations have been initialized to a given location, which defaults to the empty location.
Definition: ASTContext.cpp:2816
clang::Sema::CTK_ErrorRecovery
Definition: Sema.h:3669
clang::StaticAssertDecl::Create
static StaticAssertDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation StaticAssertLoc, Expr *AssertExpr, StringLiteral *Message, SourceLocation RParenLoc, bool Failed)
Definition: DeclCXX.cpp:3026
clang::CXXRecordDecl::isLiteral
bool isLiteral() const
Determine whether this class is a literal type.
Definition: DeclCXX.h:1357
clang::FieldDecl::setInClassInitializer
void setInClassInitializer(Expr *Init)
Set the C++11 in-class initializer for this member.
Definition: Decl.h:2886
clang::ConstructorUsingShadowDecl::getParent
const CXXRecordDecl * getParent() const
Returns the parent of this using shadow declaration, which is the class in which this is declared...
Definition: DeclCXX.h:3319
clang::Sema::ActOnReenterCXXMethodParameter
void ActOnReenterCXXMethodParameter(Scope *S, ParmVarDecl *Param)
This is used to implement the constant expression evaluation part of the attribute enable_if extensio...
Definition: SemaDeclCXX.cpp:9689
clang::Sema::BuildMemberInitializer
MemInitResult BuildMemberInitializer(ValueDecl *Member, Expr *Init, SourceLocation IdLoc)
Definition: SemaDeclCXX.cpp:4245
clang::DeclSpec::getTypeSpecType
TST getTypeSpecType() const
Definition: DeclSpec.h:479
clang::CXXBaseSpecifier::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: DeclCXX.h:189
diagnoseDeprecatedCopyOperation
static void diagnoseDeprecatedCopyOperation(Sema &S, CXXMethodDecl *CopyOp)
Diagnose an implicit copy operation for a class which is odr-used, but which is deprecated because th...
Definition: SemaDeclCXX.cpp:13545
clang::TargetCXXABI::hasKeyFunctions
bool hasKeyFunctions() const
Does this ABI use key functions? If so, class data such as the vtable is emitted with strong linkage ...
Definition: TargetCXXABI.h:235
clang::CXXRecordDecl::hasInheritedConstructor
bool hasInheritedConstructor() const
Determine whether this class has a using-declaration that names a user-declared base class constructo...
Definition: DeclCXX.h:1317
lookupCallFromSpecialMember
static Sema::SpecialMemberOverloadResult lookupCallFromSpecialMember(Sema &S, CXXRecordDecl *Class, Sema::CXXSpecialMember CSM, unsigned FieldQuals, bool ConstRHS)
Look up the special member function that would be called by a special member function for a subobject...
Definition: SemaDeclCXX.cpp:6595
clang::Expr::HasSideEffects
bool HasSideEffects(const ASTContext &Ctx, bool IncludePossibleEffects=true) const
HasSideEffects - This routine returns true for all those expressions which have any effect other than...
Definition: Expr.cpp:3396
clang::Sema::CheckConstexprKind
CheckConstexprKind
Definition: Sema.h:2218
clang::Sema::SpecialMemberDecl
llvm::PointerIntPair< CXXRecordDecl *, 3, CXXSpecialMember > SpecialMemberDecl
Definition: Sema.h:1251
clang::FunctionDecl::isConsteval
bool isConsteval() const
Definition: Decl.h:2212
clang::RecordDecl::isMsStruct
bool isMsStruct(const ASTContext &C) const
Get whether or not this is an ms_struct which can be turned on with an attribute, pragma...
Definition: Decl.cpp:4442
clang::Sema::isUsualDeallocationFunction
bool isUsualDeallocationFunction(const CXXMethodDecl *FD)
Definition: SemaExprCXX.cpp:1435
clang::FunctionDecl::setTrivialForCall
void setTrivialForCall(bool IT)
Definition: Decl.h:2126
checkComplexDecomposition
static bool checkComplexDecomposition(Sema &S, ArrayRef< BindingDecl *> Bindings, ValueDecl *Src, QualType DecompType, const ComplexType *CT)
Definition: SemaDeclCXX.cpp:931
clang::TypeLoc::getBeginLoc
SourceLocation getBeginLoc() const
Get the begin source location.
Definition: TypeLoc.cpp:191
checkArrayLikeDecomposition
static bool checkArrayLikeDecomposition(Sema &S, ArrayRef< BindingDecl *> Bindings, ValueDecl *Src, QualType DecompType, const llvm::APSInt &NumElems, QualType ElemType)
Definition: SemaDeclCXX.cpp:899
TypeOrdering.h
Allows QualTypes to be sorted and hence used in maps and sets.
clang::Sema::ActOnStaticAssertDeclaration
Decl * ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, Expr *AssertExpr, Expr *AssertMessageExpr, SourceLocation RParenLoc)
Definition: SemaDeclCXX.cpp:15578
clang::TemplateDecl::getTemplateParameters
TemplateParameterList * getTemplateParameters() const
Get the list of template parameters.
Definition: DeclTemplate.h:421
clang::DeclContext::getLexicalParent
DeclContext * getLexicalParent()
getLexicalParent - Returns the containing lexical DeclContext.
Definition: DeclBase.h:1800
clang::ComplexType::getElementType
QualType getElementType() const
Definition: Type.h:2567
clang::Sema::checkThisInStaticMemberFunctionExceptionSpec
bool checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method)
Whether this&#39; shows up in the exception specification of a static member function.
Definition: SemaDeclCXX.cpp:17121
clang::FunctionDecl::isInlineSpecified
bool isInlineSpecified() const
Determine whether the "inline" keyword was specified for this function.
Definition: Decl.h:2499
clang::ConstructorUsingShadowDecl
Represents a shadow constructor declaration introduced into a class by a C++11 using-declaration that...
Definition: DeclCXX.h:3263
clang::TagDecl::isDependentType
bool isDependentType() const
Whether this declaration declares a type that is dependent, i.e., a type that somehow depends on temp...
Definition: Decl.h:3375
clang::ValueDecl
Represent the declaration of a variable (in which case it is an lvalue) a function (in which case it ...
Definition: Decl.h:619
clang::Expr
This represents one expression.
Definition: Expr.h:108
clang::CXXConstructorDecl::isCopyOrMoveConstructor
bool isCopyOrMoveConstructor(unsigned &TypeQuals) const
Determine whether this is a copy or move constructor.
Definition: DeclCXX.cpp:2540
clang::UsingDecl::getQualifierLoc
NestedNameSpecifierLoc getQualifierLoc() const
Retrieve the nested-name-specifier that qualifies the name, with source-location information.
Definition: DeclCXX.h:3409
clang::TagDecl::getKindName
StringRef getKindName() const
Definition: Decl.h:3394
clang::ReferenceType::getPointeeType
QualType getPointeeType() const
Definition: Type.h:2771
clang::Sema::DefineImplicitCopyConstructor
void DefineImplicitCopyConstructor(SourceLocation CurrentLocation, CXXConstructorDecl *Constructor)
DefineImplicitCopyConstructor - Checks for feasibility of defining this constructor as the copy const...
Definition: SemaDeclCXX.cpp:14256
clang::ExprValueKind
ExprValueKind
The categorization of expression values, currently following the C++11 scheme.
Definition: Specifiers.h:122
CheckConstexprFunctionBody
static bool CheckConstexprFunctionBody(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *Body, Sema::CheckConstexprKind Kind)
Check the body for the given constexpr function declaration only contains the permitted types of stat...
Definition: SemaDeclCXX.cpp:2115
clang::FunctionDecl::isVariadic
bool isVariadic() const
Whether this function is variadic.
Definition: Decl.cpp:2827
clang::FunctionDecl::isDefaulted
bool isDefaulted() const
Whether this function is defaulted per C++0x.
Definition: Decl.h:2130
clang::getAsString
llvm::StringRef getAsString(SyncScope S)
Definition: SyncScope.h:50
llvm::MutableArrayRef
Definition: LLVM.h:32
clang::FunctionDecl::isUserProvided
bool isUserProvided() const
True if this method is user-declared and was not deleted or defaulted on its first declaration...
Definition: Decl.h:2147
clang::Scope::isDeclScope
bool isDeclScope(Decl *D)
isDeclScope - Return true if this is the scope that the specified decl is declared in...
Definition: Scope.h:323
clang::Sema::ImplicitExceptionSpecification
Helper class that collects exception specifications for implicitly-declared special member functions...
Definition: Sema.h:5233
clang::SourceManager::isInSystemHeader
bool isInSystemHeader(SourceLocation Loc) const
Returns if a SourceLocation is in a system header.
Definition: SourceManager.h:1493
DiagnoseBaseOrMemInitializerOrder
static void DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, const CXXConstructorDecl *Constructor, ArrayRef< CXXCtorInitializer *> Inits)
Definition: SemaDeclCXX.cpp:5170
clang::Declarator::isDecompositionDeclarator
bool isDecompositionDeclarator() const
Return whether this declarator is a decomposition declarator.
Definition: DeclSpec.h:2168
clang::Sema::BuildBasePathArray
void BuildBasePathArray(const CXXBasePaths &Paths, CXXCastPath &BasePath)
Definition: SemaDeclCXX.cpp:2809
Previous
StateNode * Previous
Definition: UnwrappedLineFormatter.cpp:934
clang::CPlusPlus
Definition: LangStandard.h:47
clang::TemplateTypeParmDecl
Declaration of a template type parameter.
Definition: DeclTemplate.h:1177
clang::TemplateTypeParmType::getIndex
unsigned getIndex() const
Definition: Type.h:4691
clang::Scope::getEntity
DeclContext * getEntity() const
Definition: Scope.h:327
clang::CXXRecordDecl::defaultedMoveConstructorIsDeleted
bool defaultedMoveConstructorIsDeleted() const
true if a defaulted move constructor for this class would be deleted.
Definition: DeclCXX.h:685
clang::UsingDecl::getNameInfo
DeclarationNameInfo getNameInfo() const
Definition: DeclCXX.h:3416
clang::LookupResult::setHideTags
void setHideTags(bool Hide)
Sets whether tag declarations should be hidden by non-tag declarations during resolution.
Definition: Lookup.h:288
clang::Sema::BuildCallExpr
ExprResult BuildCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc, MultiExprArg ArgExprs, SourceLocation RParenLoc, Expr *ExecConfig=nullptr, bool IsExecConfig=false)
BuildCallExpr - Handle a call to Fn with the specified array of arguments.
Definition: SemaExpr.cpp:5734
DeclSpec.h
This file defines the classes used to store parsed information about declaration-specifiers and decla...
IsTupleLike
IsTupleLike
Definition: SemaDeclCXX.cpp:1027
clang::Type::castAs
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:7067
clang::ElaboratedTypeKeyword
ElaboratedTypeKeyword
The elaboration keyword that precedes a qualified type name or introduces an elaborated-type-specifie...
Definition: Type.h:5206
clang::CXXRecordDecl::getFinalOverriders
void getFinalOverriders(CXXFinalOverriderMap &FinaOverriders) const
Retrieve the final overriders for each virtual member function in the class hierarchy where this clas...
Definition: CXXInheritance.cpp:731
clang::NestedNameSpecifierLoc::getBeginLoc
SourceLocation getBeginLoc() const
Retrieve the location of the beginning of this nested-name-specifier.
Definition: NestedNameSpecifier.h:292
clang::DeclaratorChunk::ParamInfo::Param
Decl * Param
Definition: DeclSpec.h:1253
clang::NamespaceDecl::setRBraceLoc
void setRBraceLoc(SourceLocation L)
Definition: Decl.h:603
Inits
Inits[]
Definition: OpenMPClause.h:150
checkVectorDecomposition
static bool checkVectorDecomposition(Sema &S, ArrayRef< BindingDecl *> Bindings, ValueDecl *Src, QualType DecompType, const VectorType *VT)
Definition: SemaDeclCXX.cpp:922
clang::CXXRecordDecl::defaultedDestructorIsConstexpr
bool defaultedDestructorIsConstexpr() const
Determine whether a defaulted default constructor for this class would be constexpr.
Definition: DeclCXX.h:1259
clang::InitializedEntity::InitializeVariable
static InitializedEntity InitializeVariable(VarDecl *Var)
Create the initialization entity for a variable.
Definition: Initialization.h:243
clang::UnionOpaquePtr::get
OpaquePtr< T > get() const
Definition: Ownership.h:104
clang::UnresolvedUsingValueDecl::Create
static UnresolvedUsingValueDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation UsingLoc, NestedNameSpecifierLoc QualifierLoc, const DeclarationNameInfo &NameInfo, SourceLocation EllipsisLoc)
Definition: DeclCXX.cpp:2977
clang::CXXThisExpr::getLocation
SourceLocation getLocation() const
Definition: ExprCXX.h:1112
clang::TypeLoc::getAs
T getAs() const
Convert to the specified TypeLoc type, returning a null TypeLoc if this TypeLoc is not of the desired...
Definition: TypeLoc.h:88
clang::CXXDestructorDecl
Represents a C++ destructor within a class.
Definition: DeclCXX.h:2649
clang::DeclaratorChunk::FunctionTypeInfo::freeParams
void freeParams()
Reset the parameter list to having zero parameters.
Definition: DeclSpec.h:1374
clang::VarDecl::setInit
void setInit(Expr *I)
Definition: Decl.cpp:2283
clang::CallExpr::getCallee
Expr * getCallee()
Definition: Expr.h:2663
clang::Decl::setInvalidDecl
void setInvalidDecl(bool Invalid=true)
setInvalidDecl - Indicates the Decl had a semantic error.
Definition: DeclBase.cpp:132
clang::DeclarationName::getAsString
std::string getAsString() const
Retrieve the human-readable string for this name.
Definition: DeclarationName.cpp:223
clang::InitListExpr::getNumInits
unsigned getNumInits() const
Definition: Expr.h:4433
clang::Sema::CheckStructuredBindingMemberAccess
AccessResult CheckStructuredBindingMemberAccess(SourceLocation UseLoc, CXXRecordDecl *DecomposedClass, DeclAccessPair Field)
Checks implicit access to a member in a structured binding.
Definition: SemaAccess.cpp:1734
clang::DeclSpec::getVolatileSpecLoc
SourceLocation getVolatileSpecLoc() const
Definition: DeclSpec.h:553
Lookup.h
clang::DeclSpec::getThreadStorageClassSpecLoc
SourceLocation getThreadStorageClassSpecLoc() const
Definition: DeclSpec.h:457
clang::Decl::isImplicit
bool isImplicit() const
isImplicit - Indicates whether the declaration was implicitly generated by the implementation.
Definition: DeclBase.h:558
clang::CXXRecordDecl::getTemplateInstantiationPattern
const CXXRecordDecl * getTemplateInstantiationPattern() const
Retrieve the record declaration from which this record could be instantiated.
Definition: DeclCXX.cpp:1725
clang::FunctionDecl::getTemplateSpecializationArgs
const TemplateArgumentList * getTemplateSpecializationArgs() const
Retrieve the template arguments used to produce this function template specialization from the primar...
Definition: Decl.cpp:3669
clang::DeclContextLookupResult::size
size_t size() const
Definition: DeclBase.h:1241
clang::ASTContext::getTagDeclType
QualType getTagDeclType(const TagDecl *Decl) const
Return the unique reference to the type for the specified TagDecl (struct/union/class/enum) decl...
Definition: ASTContext.cpp:5244
clang::Sema::PushUsingDirective
void PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir)
Definition: SemaDeclCXX.cpp:11076
clang::DeclaratorChunk::Array
Definition: DeclSpec.h:1176
clang::LinkageSpecDecl::setRBraceLoc
void setRBraceLoc(SourceLocation L)
Definition: DeclCXX.h:2824
Preprocessor.h
Defines the clang::Preprocessor interface.
clang::Sema::CheckInheritingConstructorUsingDecl
bool CheckInheritingConstructorUsingDecl(UsingDecl *UD)
Additional checks for a using declaration referring to a constructor name.
Definition: SemaDeclCXX.cpp:11827
clang::CXXRecordDecl::hasUserDeclaredMoveAssignment
bool hasUserDeclaredMoveAssignment() const
Determine whether this class has had a move assignment declared by the user.
Definition: DeclCXX.h:903
clang::Sema::VerifyIntegerConstantExpression
ExprResult VerifyIntegerConstantExpression(Expr *E, llvm::APSInt *Result, VerifyICEDiagnoser &Diagnoser, bool AllowFold=true)
VerifyIntegerConstantExpression - Verifies that an expression is an ICE, and reports the appropriate ...
Definition: SemaExpr.cpp:15009
clang::Sema::ActOnFinishFunctionDeclarationDeclarator
void ActOnFinishFunctionDeclarationDeclarator(Declarator &D)
Called after parsing a function declarator belonging to a function declaration.
Definition: SemaDeclCXX.cpp:17415
clang::RecordDecl::field_end
field_iterator field_end() const
Definition: Decl.h:3966
clang::ClassTemplateSpecializationDecl::getSpecializedTemplate
ClassTemplateDecl * getSpecializedTemplate() const
Retrieve the template that this specialization specializes.
Definition: DeclTemplate.cpp:925
clang::Sema::NoteDeletedInheritingConstructor
void NoteDeletedInheritingConstructor(CXXConstructorDecl *CD)
Definition: SemaDeclCXX.cpp:12767
clang::CXXMethodDecl::overridden_methods
overridden_method_range overridden_methods() const
Definition: DeclCXX.cpp:2303
clang::Decl::isLocalExternDecl
bool isLocalExternDecl()
Determine whether this is a block-scope declaration with linkage.
Definition: DeclBase.h:1060
clang::DeclContext::isFileContext
bool isFileContext() const
Definition: DeclBase.h:1854
clang::CXXScopeSpec::getBeginLoc
SourceLocation getBeginLoc() const
Definition: DeclSpec.h:72
clang::Decl::getDeclContext
DeclContext * getDeclContext()
Definition: DeclBase.h:438
clang::CXXRecordDecl::getDefinition
CXXRecordDecl * getDefinition() const
Definition: DeclCXX.h:533
clang::OR_Success
Overload resolution succeeded.
Definition: Overload.h:53
clang::DecompositionDeclarator
A parsed C++17 decomposition declarator of the form &#39;[&#39; identifier-list &#39;]&#39;.
Definition: DeclSpec.h:1690
clang::Sema::BuildCXXNamedCast
ExprResult BuildCXXNamedCast(SourceLocation OpLoc, tok::TokenKind Kind, TypeSourceInfo *Ty, Expr *E, SourceRange AngleBrackets, SourceRange Parens)
Definition: SemaCast.cpp:258
clang::TypeWithKeyword::getTagTypeKindForTypeSpec
static TagTypeKind getTagTypeKindForTypeSpec(unsigned TypeSpec)
Converts a type specifier (DeclSpec::TST) into a tag type kind.
Definition: Type.cpp:2632
clang::Sema::ActOnFinishCXXInClassMemberInitializer
void ActOnFinishCXXInClassMemberInitializer(Decl *VarDecl, SourceLocation EqualLoc, Expr *Init)
This is invoked after parsing an in-class initializer for a non-static C++ class member, and after instantiating an in-class initializer in a class template.
Definition: SemaDeclCXX.cpp:3894
clang::CXXRecordDecl::hasAnyDependentBases
bool hasAnyDependentBases() const
Determine whether this class has any dependent base classes which are not the current instantiation...
Definition: DeclCXX.cpp:543
clang::ASTMutationListener
An abstract interface that should be implemented by listeners that want to be notified when an AST en...
Definition: ASTMutationListener.h:46
clang::Sema::ActOnEmptyDeclaration
Decl * ActOnEmptyDeclaration(Scope *S, const ParsedAttributesView &AttrList, SourceLocation SemiLoc)
Handle a C++11 empty-declaration and attribute-declaration.
Definition: SemaDeclCXX.cpp:15385
clang::CXXTryStmt
CXXTryStmt - A C++ try block, including all handlers.
Definition: StmtCXX.h:68
clang::FunctionDecl::getStorageClass
StorageClass getStorageClass() const
Returns the storage class as written in the source.
Definition: Decl.h:2488
clang::FunctionDecl::getExceptionSpecType
ExceptionSpecificationType getExceptionSpecType() const
Gets the ExceptionSpecificationType as declared.
Definition: Decl.h:2469
Scope.h
DefineImplicitSpecialMember
static void DefineImplicitSpecialMember(Sema &S, CXXMethodDecl *MD, SourceLocation DefaultLoc)
Definition: SemaDeclCXX.cpp:6175
clang::NonTypeTemplateParmDecl
NonTypeTemplateParmDecl - Declares a non-type template parameter, e.g., "Size" in.
Definition: DeclTemplate.h:1383
clang::transformer::access
Stencil access(llvm::StringRef BaseId, Stencil Member)
Constructs a MemberExpr that accesses the named member (Member) of the object bound to BaseId...
clang::Decl::isTemplateParameter
bool isTemplateParameter() const
isTemplateParameter - Determines whether this declaration is a template parameter.
Definition: DeclBase.h:2458
clang::Decl::isTemplateParameterPack
bool isTemplateParameterPack() const
isTemplateParameter - Determines whether this declaration is a template parameter pack...
Definition: DeclBase.cpp:201
clang::Sema::ActOnDelayedCXXMethodParameter
void ActOnDelayedCXXMethodParameter(Scope *S, Decl *Param)
ActOnDelayedCXXMethodParameter - We&#39;ve already started a delayed C++ method declaration.
Definition: SemaDeclCXX.cpp:9714
clang::TemplateName
Represents a C++ template name within the type system.
Definition: TemplateName.h:191
clang::Sema::ActOnAccessSpecifier
bool ActOnAccessSpecifier(AccessSpecifier Access, SourceLocation ASLoc, SourceLocation ColonLoc, const ParsedAttributesView &Attrs)
ActOnAccessSpecifier - Parsed an access specifier followed by a colon.
Definition: SemaDeclCXX.cpp:2957
clang::ExplicitSpecifier::getExpr
const Expr * getExpr() const
Definition: DeclCXX.h:1796
clang::CXXRecordDecl::needsImplicitDestructor
bool needsImplicitDestructor() const
Determine whether this class needs an implicit destructor to be lazily declared.
Definition: DeclCXX.h:949
clang::FunctionDecl::DefaultedFunctionInfo::Create
static DefaultedFunctionInfo * Create(ASTContext &Context, ArrayRef< DeclAccessPair > Lookups)
Definition: Decl.cpp:2834
clang::Sema::RequireCompleteType
bool RequireCompleteType(SourceLocation Loc, QualType T, TypeDiagnoser &Diagnoser)
Ensure that the type T is a complete type.
Definition: SemaType.cpp:7919
clang::DeclSpec::getStorageClassSpecLoc
SourceLocation getStorageClassSpecLoc() const
Definition: DeclSpec.h:456
TypeLoc.h
Defines the clang::TypeLoc interface and its subclasses.
Depth
int Depth
Definition: ASTDiff.cpp:190
clang::Sema::ActOnStartTrailingRequiresClause
void ActOnStartTrailingRequiresClause(Scope *S, Declarator &D)
Definition: SemaDeclCXX.cpp:3871
clang::UnqualifiedId::getKind
UnqualifiedIdKind getKind() const
Determine what kind of name we have.
Definition: DeclSpec.h:1042
clang::Sema::ExpressionEvaluationContext::Unevaluated
The current expression and its subexpressions occur within an unevaluated operand (C++11 [expr]p7)...
clang::Sema::DiscardCleanupsInEvaluationContext
void DiscardCleanupsInEvaluationContext()
Definition: SemaExpr.cpp:15346
clang::RecordDecl::APK_CannotPassInRegs
The argument of this type cannot be passed directly in registers.
Definition: Decl.h:3768
clang::FunctionDecl::isFunctionTemplateSpecialization
bool isFunctionTemplateSpecialization() const
Determine whether this function is a function template specialization.
Definition: Decl.h:2589
clang::DeclarationName::getAsIdentifierInfo
IdentifierInfo * getAsIdentifierInfo() const
Retrieve the IdentifierInfo * stored in this declaration name, or null if this declaration name isn&#39;t...
Definition: DeclarationName.h:410
clang::Decl::setModulePrivate
void setModulePrivate()
Specify that this declaration was marked as being private to the module in which it was defined...
Definition: DeclBase.h:621
clang::Sema::propagateDLLAttrToBaseClassTemplate
void propagateDLLAttrToBaseClassTemplate(CXXRecordDecl *Class, Attr *ClassAttr, ClassTemplateSpecializationDecl *BaseTemplateSpec, SourceLocation BaseLoc)
Perform propagation of DLL attributes from a derived class to a templated base class for MS compatibi...
Definition: SemaDeclCXX.cpp:6056
clang::CXXRecordDecl::isPolymorphic
bool isPolymorphic() const
Whether this class is polymorphic (C++ [class.virtual]), which means that the class contains or inher...
Definition: DeclCXX.h:1117
clang::prec::Spaceship
Definition: OperatorPrecedence.h:38
clang::Expr::isTemporaryObject
bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const
Determine whether the result of this expression is a temporary object of the given class type...
Definition: Expr.cpp:3090
clang::CXXBaseSpecifier::setInheritConstructors
void setInheritConstructors(bool Inherit=true)
Set that this base class&#39;s constructors should be inherited.
Definition: DeclCXX.h:211
clang::FunctionDecl::hasBody
bool hasBody(const FunctionDecl *&Definition) const
Returns true if the function has a body.
Definition: Decl.cpp:2859
clang::SourceRange::isInvalid
bool isInvalid() const
Definition: SourceLocation.h:223
clang::Expr::getType
QualType getType() const
Definition: Expr.h:137
clang::DeclContext::isFunctionOrMethod
bool isFunctionOrMethod() const
Definition: DeclBase.h:1836
clang::Expr::isPotentialConstantExpr
static bool isPotentialConstantExpr(const FunctionDecl *FD, SmallVectorImpl< PartialDiagnosticAt > &Diags)
isPotentialConstantExpr - Return true if this function&#39;s definition might be usable in a constant exp...
Definition: ExprConstant.cpp:14626
clang::StorageClass
StorageClass
Storage classes.
Definition: Specifiers.h:235
clang::Sema::CXXCopyAssignment
Definition: Sema.h:1244
clang::CXXRecordDecl::hasNonTrivialDestructor
bool hasNonTrivialDestructor() const
Determine whether this class has a non-trivial destructor (C++ [class.dtor]p3)
Definition: DeclCXX.h:1279
clang::Sema::DefineImplicitMoveAssignment
void DefineImplicitMoveAssignment(SourceLocation CurrentLocation, CXXMethodDecl *MethodDecl)
Defines an implicitly-declared move assignment operator.
Definition: SemaDeclCXX.cpp:13954
clang::DeclSpec::TQ_const
Definition: DeclSpec.h:315
clang::DiagnosticLevelMask::Error
StmtVisitor.h
clang::DeclarationName::isIdentifier
bool isIdentifier() const
Predicate functions for querying what type of name this is.
Definition: DeclarationName.h:375
clang::LookupResult::isSingleResult
bool isSingleResult() const
Determines if this names a single result which is not an unresolved value using decl.
Definition: Lookup.h:308
clang::DeclaratorContext::ConditionContext
clang::InClassInitStyle
InClassInitStyle
In-class initialization styles for non-static data members.
Definition: Specifiers.h:258
clang::DeclarationNameTable::getCXXOperatorName
DeclarationName getCXXOperatorName(OverloadedOperatorKind Op)
Get the name of the overloadable C++ operator corresponding to Op.
Definition: DeclarationName.h:639
clang::Decl::ModuleOwnershipKind::VisibleWhenImported
This declaration has an owning module, and is visible when that module is imported.
clang::TypeAliasTemplateDecl
Declaration of an alias template.
Definition: DeclTemplate.h:2511
getRecordDiagFromTagKind
static unsigned getRecordDiagFromTagKind(TagTypeKind Tag)
Get diagnostic select index for tag kind for record diagnostic message.
Definition: SemaDeclCXX.cpp:1667
clang::DeclContext::getParent
DeclContext * getParent()
getParent - Returns the containing DeclContext.
Definition: DeclBase.h:1784
checkTrivialClassMembers
static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM, bool ConstArg, Sema::TrivialABIHandling TAH, bool Diagnose)
Check whether the members of a class type allow a special member to be trivial.
Definition: SemaDeclCXX.cpp:9087
clang::Sema::DefaultedFunctionKind
For a defaulted function, the kind of defaulted function that it is.
Definition: Sema.h:2611
clang::ReturnStmt
ReturnStmt - This represents a return, optionally of an expression: return; return 4;...
Definition: Stmt.h:2636
clang::Sema::ConditionKind::Boolean
A boolean condition, from &#39;if&#39;, &#39;while&#39;, &#39;for&#39;, or &#39;do&#39;.
clang::Sema::SetDeclDeleted
void SetDeclDeleted(Decl *dcl, SourceLocation DelLoc)
Definition: SemaDeclCXX.cpp:16285
specialMemberIsConstexpr
static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, Sema::CXXSpecialMember CSM, unsigned Quals, bool ConstRHS, CXXConstructorDecl *InheritedCtor=nullptr, Sema::InheritedConstructorInfo *Inherited=nullptr)
Is the special member function which would be selected to perform the specified operation on the spec...
Definition: SemaDeclCXX.cpp:6700
clang::ASTContext::getRecordType
QualType getRecordType(const RecordDecl *Decl) const
Definition: ASTContext.cpp:4173
clang::ActionResult::isInvalid
bool isInvalid() const
Definition: Ownership.h:166
clang::NUM_OVERLOADED_OPERATORS
Definition: OperatorKinds.h:26
clang::SourceRange::getEnd
SourceLocation getEnd() const
Definition: SourceLocation.h:217
clang::UnaryOperator
UnaryOperator - This represents the unary-expression&#39;s (except sizeof and alignof), the postinc/postdec operators from postfix-expression, and various extensions.
Definition: Expr.h:2046
clang::Sema::ImplicitExceptionSpecification::CalledDecl
void CalledDecl(SourceLocation CallLoc, const CXXMethodDecl *Method)
Integrate another called method into the collected data.
Definition: SemaDeclCXX.cpp:152
clang::CXXMemberCallExpr::getMethodDecl
CXXMethodDecl * getMethodDecl() const
Retrieve the declaration of the called method.
Definition: ExprCXX.cpp:738
clang::CXXRecordDecl::setHasTrivialSpecialMemberForCall
void setHasTrivialSpecialMemberForCall()
Definition: DeclCXX.h:1287
clang::ASTContext::getFunctionType
QualType getFunctionType(QualType ResultTy, ArrayRef< QualType > Args, const FunctionProtoType::ExtProtoInfo &EPI) const
Return a normal function type with a typed argument list.
Definition: ASTContext.h:1401
clang::Sema::RequireLiteralType
bool RequireLiteralType(SourceLocation Loc, QualType T, TypeDiagnoser &Diagnoser)
Ensure that the type T is a literal type.
Definition: SemaType.cpp:8273
clang::VectorType
Represents a GCC generic vector type.
Definition: Type.h:3235
clang::LValueReferenceType
An lvalue reference type, per C++11 [dcl.ref].
Definition: Type.h:2797
clang::DeclContext::isDependentContext
bool isDependentContext() const
Determines whether this context is dependent on a template parameter.
Definition: DeclBase.cpp:1091
clang::DeclSpec::isFriendSpecified
bool isFriendSpecified() const
Definition: DeclSpec.h:740
clang::Type::getBaseElementTypeUnsafe
const Type * getBaseElementTypeUnsafe() const
Get the base element type of this type, potentially discarding type qualifiers.
Definition: Type.h:6925
clang::VarDecl::evaluateValue
APValue * evaluateValue() const
Attempt to evaluate the value of the initializer attached to this declaration, and produce notes expl...
Definition: Decl.cpp:2356
clang::Sema::SynthesizedFunctionScope::addContextNote
void addContextNote(SourceLocation UseLoc)
Definition: Sema.h:857
ASTConsumer.h
clang::CXXRecordDecl::hasTrivialCopyConstructor
bool hasTrivialCopyConstructor() const
Determine whether this class has a trivial copy constructor (C++ [class.copy]p6, C++11 [class...
Definition: DeclCXX.h:1181
clang::Sema::ActOnCXXEnterDeclInitializer
void ActOnCXXEnterDeclInitializer(Scope *S, Decl *Dcl)
ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an initializer for the declaration ...
Definition: SemaDeclCXX.cpp:16656
clang::CXXDestructorDecl::setOperatorDelete
void setOperatorDelete(FunctionDecl *OD, Expr *ThisArg)
Definition: DeclCXX.cpp:2643
clang::DeclRefExpr::getDecl
ValueDecl * getDecl()
Definition: Expr.h:1247
clang::CXXRecordDecl::needsImplicitDefaultConstructor
bool needsImplicitDefaultConstructor() const
Determine if we need to declare a default constructor for this class.
Definition: DeclCXX.h:738
clang::ActionResult::isUsable
bool isUsable() const
Definition: Ownership.h:167
clang::CXXConversionDecl
Represents a C++ conversion function within a class.
Definition: DeclCXX.h:2713
RecursiveASTVisitor.h
clang::ASTContext::getTypeDeclType
QualType getTypeDeclType(const TypeDecl *Decl, const TypeDecl *PrevDecl=nullptr) const
Return the unique reference to the type for the specified type declaration.
Definition: ASTContext.h:1417
clang::ObjCSubstitutionContext::Result
The result type of a method or function.
clang::TSK_ImplicitInstantiation
This template specialization was implicitly instantiated from a template.
Definition: Specifiers.h:181
clang::FunctionDecl::isTrivial
bool isTrivial() const
Whether this function is "trivial" in some specialized C++ senses.
Definition: Decl.h:2122
clang::Type::isUnionType
bool isUnionType() const
Definition: Type.cpp:527
clang::DependentNameTypeLoc::setQualifierLoc
void setQualifierLoc(NestedNameSpecifierLoc QualifierLoc)
Definition: TypeLoc.h:2164
PopulateKeysForFields
static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl< const void *> &IdealInits)
Definition: SemaDeclCXX.cpp:5146
clang::QualType::isNull
bool isNull() const
Return true if this QualType doesn&#39;t point to a type yet.
Definition: Type.h:719
clang::CXXRecordDecl::hasNonTrivialMoveAssignment
bool hasNonTrivialMoveAssignment() const
Determine whether this class has a non-trivial move assignment operator (C++11 [class.copy]p25)
Definition: DeclCXX.h:1251
clang::CXXRecordDecl::isProvablyNotDerivedFrom
bool isProvablyNotDerivedFrom(const CXXRecordDecl *Base) const
Determine whether this class is provably not derived from the type Base.
Definition: CXXInheritance.cpp:132
clang::Sema::DiagnoseNontrivial
void DiagnoseNontrivial(const CXXRecordDecl *Record, CXXSpecialMember CSM)
Diagnose why the specified class does not have a trivial special member of the given kind...
Definition: SemaDeclCXX.cpp:9138
clang::isTemplateInstantiation
bool isTemplateInstantiation(TemplateSpecializationKind Kind)
Determine whether this template specialization kind refers to an instantiation of an entity (as oppos...
Definition: Specifiers.h:199
clang::Sema::CheckOverridingFunctionAttributes
bool CheckOverridingFunctionAttributes(const CXXMethodDecl *New, const CXXMethodDecl *Old)
Definition: SemaDeclCXX.cpp:16456
clang::Sema::TAH_ConsiderTrivialABI
The triviality of a method affected by "trivial_abi".
Definition: Sema.h:2603
clang::Sema::DefineImplicitDefaultConstructor
void DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, CXXConstructorDecl *Constructor)
DefineImplicitDefaultConstructor - Checks for feasibility of defining this constructor as the default...
Definition: SemaDeclCXX.cpp:12636
clang::CallingConv
CallingConv
CallingConv - Specifies the calling convention that a function uses.
Definition: Specifiers.h:265
clang::OverloadCandidateSet::exclude
void exclude(Decl *F)
Exclude a function from being considered by overload resolution.
Definition: Overload.h:1045
clang::FunctionTypeLoc::getReturnLoc
TypeLoc getReturnLoc() const
Definition: TypeLoc.h:1435
RefersToRValueRef
static bool RefersToRValueRef(Expr *MemRef)
Definition: SemaDeclCXX.cpp:4610
clang::ComparisonCategoryInfo::ValueInfo::hasValidIntValue
bool hasValidIntValue() const
True iff we&#39;ve successfully evaluated the variable as a constant expression and extracted its integer...
Definition: ComparisonCategories.cpp:42
clang::TemplateParameterList::Create
static TemplateParameterList * Create(const ASTContext &C, SourceLocation TemplateLoc, SourceLocation LAngleLoc, ArrayRef< NamedDecl *> Params, SourceLocation RAngleLoc, Expr *RequiresClause)
Definition: DeclTemplate.cpp:90
clang::Decl::getFriendObjectKind
FriendObjectKind getFriendObjectKind() const
Determines whether this declaration is the object of a friend declaration and, if so...
Definition: DeclBase.h:1111
clang::Stmt::getEndLoc
SourceLocation getEndLoc() const LLVM_READONLY
Definition: Stmt.cpp:288
clang::QualType::getCVRQualifiers
unsigned getCVRQualifiers() const
Retrieve the set of CVR (const-volatile-restrict) qualifiers applied to this type.
Definition: Type.h:6289
clang::InitializationKind::CreateCopy
static InitializationKind CreateCopy(SourceLocation InitLoc, SourceLocation EqualLoc, bool AllowExplicitConvs=false)
Create a copy initialization.
Definition: Initialization.h:648
CheckPolymorphic
#define CheckPolymorphic(Type)
Definition: SemaDeclCXX.cpp:5678
clang::Type::getCanonicalTypeUnqualified
CanQualType getCanonicalTypeUnqualified() const
Definition: CanonicalType.h:214
clang::DeclaratorChunk::FunctionTypeInfo::getRefQualifierLoc
SourceLocation getRefQualifierLoc() const
Retrieve the location of the ref-qualifier, if any.
Definition: DeclSpec.h:1442
clang::QualType::isConstQualified
bool isConstQualified() const
Determine whether this type is const-qualified.
Definition: Type.h:6315
clang::TST_decltype_auto
Definition: Specifiers.h:92
clang::Declarator::hasGroupingParens
bool hasGroupingParens() const
Definition: DeclSpec.h:2535
clang::FunctionDecl::TK_NonTemplate
Definition: Decl.h:1792
clang::Sema::HideUsingShadowDecl
void HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow)
Hides a using shadow declaration.
Definition: SemaDeclCXX.cpp:11429
clang::FunctionProtoType::hasTrailingReturn
bool hasTrailingReturn() const
Whether this function prototype has a trailing return type.
Definition: Type.h:4102
clang::RecordType::getDecl
RecordDecl * getDecl() const
Definition: Type.h:4505
clang::CXXRecordDecl::hasVariantMembers
bool hasVariantMembers() const
Determine whether this class has any variant members.
Definition: DeclCXX.h:1139
clang::EST_NoexceptFalse
noexcept(expression), evals to &#39;false&#39;
Definition: ExceptionSpecificationType.h:28
clang::CXXScopeSpec::getScopeRep
NestedNameSpecifier * getScopeRep() const
Retrieve the representation of the nested-name-specifier.
Definition: DeclSpec.h:76
clang::AS_protected
Definition: Specifiers.h:115
CheckConstexprDeclStmt
static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, DeclStmt *DS, SourceLocation &Cxx1yLoc, Sema::CheckConstexprKind Kind)
Check the given declaration statement is legal within a constexpr function body.
Definition: SemaDeclCXX.cpp:1773
clang::RecordDecl::isInjectedClassName
bool isInjectedClassName() const
Determines whether this declaration represents the injected class name.
Definition: Decl.cpp:4406
clang::BinaryOperator::getOverloadedOpcode
static Opcode getOverloadedOpcode(OverloadedOperatorKind OO)
Retrieve the binary opcode that corresponds to the given overloaded operator.
Definition: Expr.cpp:2051
clang::DeclaratorDecl::getTrailingRequiresClause
Expr * getTrailingRequiresClause()
Get the constraint-expression introduced by the trailing requires-clause in the function/member decla...
Definition: Decl.h:747
clang::CXXMethodDecl::size_overridden_methods
unsigned size_overridden_methods() const
Definition: DeclCXX.cpp:2297
SearchForReturnInStmt
static void SearchForReturnInStmt(Sema &Self, Stmt *S)
Definition: SemaDeclCXX.cpp:16437
clang::DeclSpec::TQ_atomic
Definition: DeclSpec.h:321
clang::ArrayTypeLoc
Wrapper for source info for arrays.
Definition: TypeLoc.h:1484
clang::isComputedNoexcept
bool isComputedNoexcept(ExceptionSpecificationType ESpecType)
Definition: ExceptionSpecificationType.h:39
DiagnoseUnexpandedParameterPacks
static bool DiagnoseUnexpandedParameterPacks(Sema &S, TemplateTemplateParmDecl *TTP)
Check for unexpanded parameter packs within the template parameters of a template template parameter...
Definition: SemaTemplate.cpp:2361
clang::Sema::checkClassLevelCodeSegAttribute
void checkClassLevelCodeSegAttribute(CXXRecordDecl *Class)
Definition: SemaDeclCXX.cpp:5880
CheckConstexprCtorInitializer
static bool CheckConstexprCtorInitializer(Sema &SemaRef, const FunctionDecl *Dcl, FieldDecl *Field, llvm::SmallSet< Decl *, 16 > &Inits, bool &Diagnosed, Sema::CheckConstexprKind Kind)
Check that the given field is initialized within a constexpr constructor.
Definition: SemaDeclCXX.cpp:1914
clang::Sema::BuildCXXConstructExpr
ExprResult BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, NamedDecl *FoundDecl, CXXConstructorDecl *Constructor, MultiExprArg Exprs, bool HadMultipleCandidates, bool IsListInitialization, bool IsStdInitListInitialization, bool RequiresZeroInit, unsigned ConstructKind, SourceRange ParenRange)
BuildCXXConstructExpr - Creates a complete call to a constructor, including handling of its default a...
Definition: SemaDeclCXX.cpp:14564
clang::NestedNameSpecifier::containsUnexpandedParameterPack
bool containsUnexpandedParameterPack() const
Whether this nested-name-specifier contains an unexpanded parameter pack (for C++11 variadic template...
Definition: NestedNameSpecifier.cpp:252
clang::DeclContext::getDeclKind
Decl::Kind getDeclKind() const
Definition: DeclBase.h:1777
clang::Sema::ActOnStartCXXInClassMemberInitializer
void ActOnStartCXXInClassMemberInitializer()
Enter a new C++ default initializer scope.
Definition: SemaDeclCXX.cpp:3865
CheckOperatorNewDeleteDeclarationScope
static bool CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, const FunctionDecl *FnDecl)
Definition: SemaDeclCXX.cpp:14823
clang::Sema::DefaultedFunctionKind::isComparison
bool isComparison() const
Definition: Sema.h:2625
clang::UnqualifiedId::Kind
UnqualifiedIdKind Kind
Describes the kind of unqualified-id parsed.
Definition: DeclSpec.h:967
clang::OpaqueValueExpr
OpaqueValueExpr - An expression referring to an opaque object of a fixed type and value class...
Definition: Expr.h:1075
clang::DeclContext::makeDeclVisibleInContext
void makeDeclVisibleInContext(NamedDecl *D)
Makes a declaration visible within this context.
Definition: DeclBase.cpp:1802
clang::Sema::pushCodeSynthesisContext
void pushCodeSynthesisContext(CodeSynthesisContext Ctx)
Definition: SemaTemplateInstantiate.cpp:424
clang::Qualifiers::Const
Definition: Type.h:146
clang::Sema::CodeSynthesisContext::DeclaringSpecialMember
We are declaring an implicit special member function.
Definition: Sema.h:8042
clang::OverloadCandidateSet::iterator
SmallVectorImpl< OverloadCandidate >::iterator iterator
Definition: Overload.h:1053
clang::Sema::CodeSynthesisContext::SpecialMember
CXXSpecialMember SpecialMember
The special member being declared or defined.
Definition: Sema.h:8103
clang::ASTContext::BuiltinFnTy
CanQualType BuiltinFnTy
Definition: ASTContext.h:1046
clang::TTK_Struct
The "struct" keyword.
Definition: Type.h:5189
Kind
Kind
Definition: ChrootChecker.cpp:29
findUserDeclaredCtor
static CXXConstructorDecl * findUserDeclaredCtor(CXXRecordDecl *RD)
Definition: SemaDeclCXX.cpp:9008
clang::getRewrittenOverloadedOperator
OverloadedOperatorKind getRewrittenOverloadedOperator(OverloadedOperatorKind Kind)
Get the other overloaded operator that the given operator can be rewritten into, if any such operator...
Definition: OperatorKinds.h:36
clang::CXXInheritedCtorInitExpr
Represents a call to an inherited base class constructor from an inheriting constructor.
Definition: ExprCXX.h:1613
clang::ActionResult
ActionResult - This structure is used while parsing/acting on expressions, stmts, etc...
Definition: Ownership.h:153
clang::FunctionProtoType::ExceptionSpecInfo::Type
ExceptionSpecificationType Type
The kind of exception specification this is.
Definition: Type.h:3813
clang::PseudoObjectExpr
PseudoObjectExpr - An expression which accesses a pseudo-object l-value.
Definition: Expr.h:5715
clang::ASTContext::getElaboratedType
QualType getElaboratedType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS, QualType NamedType, TagDecl *OwnedTagDecl=nullptr) const
Definition: ASTContext.cpp:4439
clang::TypeLoc::IgnoreParens
TypeLoc IgnoreParens() const
Definition: TypeLoc.h:1151
clang::ParmVarDecl::getSourceRange
SourceRange getSourceRange() const override LLVM_READONLY
Source range that this declaration covers.
Definition: Decl.cpp:2695
clang::Redeclarable::getPreviousDecl
decl_type * getPreviousDecl()
Return the previous declaration of this declaration or NULL if this is the first declaration.
Definition: Redeclarable.h:203
clang::FunctionProtoType::getExtParameterInfo
ExtParameterInfo getExtParameterInfo(unsigned I) const
Definition: Type.h:4167
clang::FunctionProtoType::getExtProtoInfo
ExtProtoInfo getExtProtoInfo() const
Definition: Type.h:3975
clang::Decl::getAsFunction
FunctionDecl * getAsFunction() LLVM_READONLY
Returns the function itself, or the templated function if this is a function template.
Definition: DeclBase.cpp:218
clang::DeclSpec::getStorageClassSpec
SCS getStorageClassSpec() const
Definition: DeclSpec.h:447
clang::Sema::getASTContext
ASTContext & getASTContext() const
Definition: Sema.h:1331
clang::CXXCtorInitializer::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
Determine the source range covering the entire initializer.
Definition: DeclCXX.cpp:2438
clang::FriendDecl::Create
static FriendDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation L, FriendUnion Friend_, SourceLocation FriendL, ArrayRef< TemplateParameterList *> FriendTypeTPLists=None)
Definition: DeclFriend.cpp:34
clang::Redeclarable::redecls
redecl_range redecls() const
Returns an iterator range for all the redeclarations of the same decl.
Definition: Redeclarable.h:294
clang::LinkageSpecDecl::lang_cxx
Definition: DeclCXX.h:2787
clang::Sema::AbstractArrayType
Definition: Sema.h:6801
IndirectBaseSet
llvm::SmallPtrSet< QualType, 4 > IndirectBaseSet
Use small set to collect indirect bases.
Definition: SemaDeclCXX.cpp:2602
clang::CXXRecordDecl::hasTrivialCopyAssignment
bool hasTrivialCopyAssignment() const
Determine whether this class has a trivial copy assignment operator (C++ [class.copy]p11, C++11 [class.copy]p25)
Definition: DeclCXX.h:1231
clang::LangAS::Default
clang::ParsedAttributesView::const_iterator
Definition: ParsedAttr.h:759
clang::SourceLocation
Encodes a location in the source.
Definition: SourceLocation.h:86
clang::Sema::ActOnFinishDelayedMemberDeclarations
void ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *Record)
Definition: SemaDeclCXX.cpp:9681
clang::CompoundStmt::body
body_range body()
Definition: Stmt.h:1365
clang::FunctionType::getReturnType
QualType getReturnType() const
Definition: Type.h:3680
clang::DeclarationName::CXXConstructorName
Definition: DeclarationName.h:206
clang::IdentifierTable::get
IdentifierInfo & get(StringRef Name)
Return the identifier token info for the specified named identifier.
Definition: IdentifierTable.h:529
ComputeDefaultedComparisonExceptionSpec
static Sema::ImplicitExceptionSpecification ComputeDefaultedComparisonExceptionSpec(Sema &S, SourceLocation Loc, FunctionDecl *FD, Sema::DefaultedComparisonKind DCK)
Definition: SemaDeclCXX.cpp:8206
clang::Sema::CodeSynthesisContext::ExceptionSpecEvaluation
We are computing the exception specification for a defaulted special member function.
Definition: Sema.h:8028
clang::DeclSpec::SCS_extern
Definition: DeclSpec.h:235
clang::EnumType
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of enums...
Definition: Type.h:4521
clang::DeclarationName::Identifier
Definition: DeclarationName.h:203
clang::Sema::CheckPureMethod
bool CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange)
Mark the given method pure.
Definition: SemaDeclCXX.cpp:16615
clang::ASTContext::hasSameTemplateName
bool hasSameTemplateName(TemplateName X, TemplateName Y)
Determine whether the given template names refer to the same template.
Definition: ASTContext.cpp:5598
APSInt
llvm::APSInt APSInt
Definition: ByteCodeEmitter.cpp:18
clang::Sema::ActOnFinishLinkageSpecification
Decl * ActOnFinishLinkageSpecification(Scope *S, Decl *LinkageSpec, SourceLocation RBraceLoc)
ActOnFinishLinkageSpecification - Complete the definition of the C++ linkage specification LinkageSpe...
Definition: SemaDeclCXX.cpp:15374
clang::Decl::setModuleOwnershipKind
void setModuleOwnershipKind(ModuleOwnershipKind MOK)
Set whether this declaration is hidden from name lookup.
Definition: DeclBase.h:791
clang::CXXTryStmt::getNumHandlers
unsigned getNumHandlers() const
Definition: StmtCXX.h:106
clang::DeclContext::decls_begin
decl_iterator decls_begin() const
Definition: DeclBase.cpp:1388
clang::UnaryOperator::getSubExpr
Expr * getSubExpr() const
Definition: Expr.h:2076
clang::DiagnosticErrorTrap::hasErrorOccurred
bool hasErrorOccurred() const
Determine whether any errors have occurred since this object instance was created.
Definition: Diagnostic.h:1020
clang::Sema::BuildStaticAssertDeclaration
Decl * BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, Expr *AssertExpr, StringLiteral *AssertMessageExpr, SourceLocation RParenLoc, bool Failed)
Definition: SemaDeclCXX.cpp:15592
clang::Type::isVariablyModifiedType
bool isVariablyModifiedType() const
Whether this type is a variably-modified type (C99 6.7.5).
Definition: Type.h:2166
clang::FunctionType::ExtParameterInfo::isNoEscape
bool isNoEscape() const
Definition: Type.h:3487
clang::CXXRecordDecl::setTrivialForCallFlags
void setTrivialForCallFlags(CXXMethodDecl *MD)
Definition: DeclCXX.cpp:1369
clang::Attr::clone
Attr * clone(ASTContext &C) const
clang::DeclaratorChunk::Kind
enum clang::DeclaratorChunk::@219 Kind
clang::Declarator::getName
UnqualifiedId & getName()
Retrieve the name specified by this declarator.
Definition: DeclSpec.h:1914
clang::CastExpr::getCastKind
CastKind getCastKind() const
Definition: Expr.h:3196
clang::Sema::ComparisonCategoryUsage
ComparisonCategoryUsage
Definition: Sema.h:5081
clang::CSK_unspecified
Definition: Specifiers.h:33
clang::Type::isLiteralType
bool isLiteralType(const ASTContext &Ctx) const
Return true if this is a literal type (C++11 [basic.types]p10)
Definition: Type.cpp:2383
clang::FieldDecl::isUnnamedBitfield
bool isUnnamedBitfield() const
Determines whether this is an unnamed bitfield.
Definition: Decl.h:2810
clang::Sema::checkThisInStaticMemberFunctionAttributes
bool checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method)
Check whether &#39;this&#39; shows up in the attributes of the given static member function.
Definition: SemaDeclCXX.cpp:17163
clang::DeclarationNameInfo::getName
DeclarationName getName() const
getName - Returns the embedded declaration name.
Definition: DeclarationName.h:713
clang::TagDecl
Represents the declaration of a struct/union/class/enum.
Definition: Decl.h:3219
clang::UsingDecl::getUsingLoc
SourceLocation getUsingLoc() const
Return the source location of the &#39;using&#39; keyword.
Definition: DeclCXX.h:3402
clang::Sema::ImplicitExceptionSpecification::CalledStmt
void CalledStmt(Stmt *S)
Integrate an invoked statement into the collected data.
Definition: SemaDeclCXX.cpp:220
clang::Sema::referenceDLLExportedClassMethods
void referenceDLLExportedClassMethods()
Definition: SemaDeclCXX.cpp:12996
clang::MultiExprArg
MutableArrayRef< Expr * > MultiExprArg
Definition: Ownership.h:273
clang::Sema::SpecialMemberOverloadResult::getKind
Kind getKind() const
Definition: Sema.h:1150
clang::ASTContext::CreateTypeSourceInfo
TypeSourceInfo * CreateTypeSourceInfo(QualType T, unsigned Size=0) const
Allocate an uninitialized TypeSourceInfo.
Definition: ASTContext.cpp:2802
clang::CXXMemberCallExpr
Represents a call to a member function that may be written either with member call syntax (e...
Definition: ExprCXX.h:171
clang::Decl::getASTContext
ASTContext & getASTContext() const LLVM_READONLY
Definition: DeclBase.cpp:377
clang::DeclaratorChunk::Fun
FunctionTypeInfo Fun
Definition: DeclSpec.h:1546
clang::DeclSpec::isModulePrivateSpecified
bool isModulePrivateSpecified() const
Definition: DeclSpec.h:743
clang::Sema::InheritedConstructorInfo::InheritedConstructorInfo
InheritedConstructorInfo(Sema &S, SourceLocation UseLoc, ConstructorUsingShadowDecl *Shadow)
Definition: SemaDeclCXX.cpp:6627
clang::LangOptions::ClangABI::Ver4
Attempt to be ABI-compatible with code generated by Clang 4.0.x (SVN r291814).
CheckOperatorNewDeleteTypes
static bool CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, CanQualType ExpectedResultType, CanQualType ExpectedFirstParamType, unsigned DependentParamTypeDiag, unsigned InvalidParamTypeDiag)
Definition: SemaDeclCXX.cpp:14850
clang::OCD_AmbiguousCandidates
Requests that only tied-for-best candidates be shown.
Definition: Overload.h:74
clang::ComparisonCategories::lookupInfoForType
const ComparisonCategoryInfo * lookupInfoForType(QualType Ty) const
Definition: ComparisonCategories.cpp:124
clang::IfStmt::getElse
Stmt * getElse()
Definition: Stmt.h:1930
clang::VectorType::getElementType
QualType getElementType() const
Definition: Type.h:3270
clang::getDLLAttr
InheritableAttr * getDLLAttr(Decl *D)
Return a DLL attribute from the declaration.
Definition: SemaInternal.h:54
clang::DeclStmt
DeclStmt - Adaptor class for mixing declarations with statements and expressions. ...
Definition: Stmt.h:1225
clang::Decl::setReferenced
void setReferenced(bool R=true)
Definition: DeclBase.h:588
clang::Sema::DeclareImplicitEqualityComparison
void DeclareImplicitEqualityComparison(CXXRecordDecl *RD, FunctionDecl *Spaceship)
Definition: SemaDeclCXX.cpp:8156
clang::Preprocessor::getIdentifierTable
IdentifierTable & getIdentifierTable()
Definition: Preprocessor.h:914
clang::ParsedAttr
ParsedAttr - Represents a syntactic attribute.
Definition: ParsedAttr.h:117
clang::DeclSpec::SetStorageClassSpec
bool SetStorageClassSpec(Sema &S, SCS SC, SourceLocation Loc, const char *&PrevSpec, unsigned &DiagID, const PrintingPolicy &Policy)
These methods set the specified attribute of the DeclSpec and return false if there was no error...
Definition: DeclSpec.cpp:589
clang::Sema::DefineImplicitDestructor
void DefineImplicitDestructor(SourceLocation CurrentLocation, CXXDestructorDecl *Destructor)
DefineImplicitDestructor - Checks for feasibility of defining this destructor as the default destruct...
Definition: SemaDeclCXX.cpp:12921
clang::UnresolvedUsingValueDecl
Represents a dependent using declaration which was not marked with typename.
Definition: DeclCXX.h:3588
clang::TagDecl::getCanonicalDecl
TagDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: Decl.cpp:4143
clang::FieldDecl::getInClassInitializer
Expr * getInClassInitializer() const
Get the C++11 default member initializer for this member, or null if one has not been set...
Definition: Decl.h:2876
clang::QualType::getLocalCVRQualifiers
unsigned getLocalCVRQualifiers() const
Retrieve the set of CVR (const-volatile-restrict) qualifiers local to this particular QualType instan...
Definition: Type.h:781
clang::Sema::AbstractNone
Definition: Sema.h:6794
clang::Declarator::getDecompositionDeclarator
const DecompositionDeclarator & getDecompositionDeclarator() const
Definition: DeclSpec.h:1916
clang::UsingDecl::removeShadowDecl
void removeShadowDecl(UsingShadowDecl *S)
Definition: DeclCXX.cpp:2914
clang::CXXConstructorDecl::setCtorInitializers
void setCtorInitializers(CXXCtorInitializer **Initializers)
Definition: DeclCXX.h:2532
clang::ASTContext::getBaseElementType
QualType getBaseElementType(const ArrayType *VAT) const
Return the innermost element type of an array type.
Definition: ASTContext.cpp:5822
clang::PartialDiagnosticAt
std::pair< SourceLocation, PartialDiagnostic > PartialDiagnosticAt
A partial diagnostic along with the source location where this diagnostic occurs. ...
Definition: PartialDiagnostic.h:418
clang::CXXMethodDecl
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:1931
clang::AS_public
Definition: Specifiers.h:114
clang::FunctionDecl::setDefaulted
void setDefaulted(bool D=true)
Definition: Decl.h:2131
Initialization.h
clang::ASTContext::getAsConstantArrayType
const ConstantArrayType * getAsConstantArrayType(QualType T) const
Definition: ASTContext.h:2466
clang::FunctionProtoType::hasExceptionSpec
bool hasExceptionSpec() const
Return whether this function has any kind of exception spec.
Definition: Type.h:3995
clang::CXXBasePaths::begin
paths_iterator begin()
Definition: CXXInheritance.h:191
clang::StmtVisitor
StmtVisitor - This class implements a simple visitor for Stmt subclasses.
Definition: StmtVisitor.h:183
clang::Sema::SetDeclDefaulted
void SetDeclDefaulted(Decl *dcl, SourceLocation DefaultLoc)
Definition: SemaDeclCXX.cpp:16352
clang::DeclSpec::SCS_typedef
Definition: DeclSpec.h:234
clang::TemplateParameterList::getRequiresClause
Expr * getRequiresClause()
The constraint-expression of the associated requires-clause.
Definition: DeclTemplate.h:176
clang::EST_Uninstantiated
not instantiated yet
Definition: ExceptionSpecificationType.h:31
clang::VarDecl::hasGlobalStorage
bool hasGlobalStorage() const
Returns true for all variables that do not have local storage.
Definition: Decl.h:1087
clang::Sema::DefaultLvalueConversion
ExprResult DefaultLvalueConversion(Expr *E)
Definition: SemaExpr.cpp:592
clang::NestedNameSpecifier
Represents a C++ nested name specifier, such as "\::std::vector<int>::".
Definition: NestedNameSpecifier.h:48
clang::RQ_None
No ref-qualifier was provided.
Definition: Type.h:1403
clang::Scope::setEntity
void setEntity(DeclContext *E)
Definition: Scope.h:328
clang::Sema::CheckIfOverriddenFunctionIsMarkedFinal
bool CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, const CXXMethodDecl *Old)
CheckForFunctionMarkedFinal - Checks whether a virtual member function overrides a virtual member fun...
Definition: SemaDeclCXX.cpp:3064
clang::Sema::RecordDeclSetTy
llvm::SmallPtrSet< const CXXRecordDecl *, 8 > RecordDeclSetTy
Definition: Sema.h:660
clang::FunctionDecl::getParamDecl
const ParmVarDecl * getParamDecl(unsigned i) const
Definition: Decl.h:2422
clang::Sema::getAmbiguousPathsDisplayString
std::string getAmbiguousPathsDisplayString(CXXBasePaths &Paths)
Builds a string representing ambiguous paths from a specific derived class to different subobjects of...
Definition: SemaDeclCXX.cpp:2933
clang::CXXRecordDecl::setImplicitMoveConstructorIsDeleted
void setImplicitMoveConstructorIsDeleted()
Set that we attempted to declare an implicit move constructor, but overload resolution failed so we d...
Definition: DeclCXX.h:834
clang::Attr::getLocation
SourceLocation getLocation() const
Definition: Attr.h:92
clang::TagDecl::getSourceRange
SourceRange getSourceRange() const override LLVM_READONLY
Source range that this declaration covers.
Definition: Decl.cpp:4137
clang::LookupResult::FoundUnresolvedValue
Name lookup found an unresolvable value declaration and cannot yet complete.
Definition: Lookup.h:68
clang::ASTContext::getAsArrayType
const ArrayType * getAsArrayType(QualType T) const
Type Query functions.
Definition: ASTContext.cpp:5711
clang::FunctionProtoType::getMethodQuals
Qualifiers getMethodQuals() const
Definition: Type.h:4104
clang::CanQual< Type >
clang::FunctionProtoType::getNoexceptExpr
Expr * getNoexceptExpr() const
Return the expression inside noexcept(expression), or a null pointer if there is none (because the ex...
Definition: Type.h:4047
findDirectBaseWithType
static CXXBaseSpecifier * findDirectBaseWithType(CXXRecordDecl *Derived, QualType DesiredBase, bool &AnyDependentBases)
Find the base specifier for a base class with the given type.
Definition: SemaDeclCXX.cpp:11451
clang::ASTContext::VoidTy
CanQualType VoidTy
Definition: ASTContext.h:1016
clang::Sema::actOnDelayedExceptionSpecification
void actOnDelayedExceptionSpecification(Decl *Method, ExceptionSpecificationType EST, SourceRange SpecificationRange, ArrayRef< ParsedType > DynamicExceptions, ArrayRef< SourceRange > DynamicExceptionRanges, Expr *NoexceptExpr)
Add an exception-specification to the given member function (or member function template).
Definition: SemaDeclCXX.cpp:17259
clang::CXXRecordDecl::isGenericLambda
bool isGenericLambda() const
Determine whether this class describes a generic lambda function object (i.e.
Definition: DeclCXX.cpp:1396
clang::InitializationKind
Describes the kind of initialization being performed, along with location information for tokens rela...
Definition: Initialization.h:541
clang::Expr::isValueDependent
bool isValueDependent() const
isValueDependent - Determines whether this expression is value-dependent (C++ [temp.dep.constexpr]).
Definition: Expr.h:158
clang::Sema::CorrectTypo
TypoCorrection CorrectTypo(const DeclarationNameInfo &Typo, Sema::LookupNameKind LookupKind, Scope *S, CXXScopeSpec *SS, CorrectionCandidateCallback &CCC, CorrectTypoKind Mode, DeclContext *MemberContext=nullptr, bool EnteringContext=false, const ObjCObjectPointerType *OPT=nullptr, bool RecordFailure=true)
Try to "correct" a typo in the source code by finding visible declarations whose names are similar to...
Definition: SemaLookup.cpp:4999
TryNamespaceTypoCorrection
static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, CXXScopeSpec &SS, SourceLocation IdentLoc, IdentifierInfo *Ident)
Definition: SemaDeclCXX.cpp:10965
clang::Sema::AbstractDiagSelID
AbstractDiagSelID
Definition: Sema.h:6793
clang::CallExpr::arguments
arg_range arguments()
Definition: Expr.h:2739
clang::DeclAccessPair::getAccess
AccessSpecifier getAccess() const
Definition: DeclAccessPair.h:44
llvm::SmallVector< StringRef, 8 >
clang::DeclaratorChunk::Pointer
Definition: DeclSpec.h:1176
clang::Sema::BuildQualifiedType
QualType BuildQualifiedType(QualType T, SourceLocation Loc, Qualifiers Qs, const DeclSpec *DS=nullptr)
Definition: SemaType.cpp:1800
clang::Type::isObjCObjectPointerType
bool isObjCObjectPointerType() const
Definition: Type.h:6618
clang::LookupResult::Filter
A class for iterating through a result set and possibly filtering out results.
Definition: Lookup.h:617
clang::TemplateParameterList::size
unsigned size() const
Definition: DeclTemplate.h:129
clang::ICIS_ListInit
Direct list-initialization.
Definition: Specifiers.h:261
clang::VirtSpecifiers
Represents a C++11 virt-specifier-seq.
Definition: DeclSpec.h:2586
clang::interp::APInt
llvm::APInt APInt
Definition: Integral.h:27
clang::OverloadCandidateSet::CSK_Operator
C++ [over.match.oper]: Lookup of operator function candidates in a call using operator syntax...
Definition: Overload.h:907
clang::ConstructorUsingShadowDecl::Create
static ConstructorUsingShadowDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation Loc, UsingDecl *Using, NamedDecl *Target, bool IsVirtual)
Definition: DeclCXX.cpp:2886
clang::ImplicitCastExpr
ImplicitCastExpr - Allows us to explicitly represent implicit type conversions, which have no direct ...
Definition: Expr.h:3274
clang::Type::isFunctionProtoType
bool isFunctionProtoType() const
Definition: Type.h:2013
clang::FunctionProtoTypeLoc
Definition: TypeLoc.h:1466
checkSimpleDecomposition
static bool checkSimpleDecomposition(Sema &S, ArrayRef< BindingDecl *> Bindings, ValueDecl *Src, QualType DecompType, const llvm::APSInt &NumElems, QualType ElemType, llvm::function_ref< ExprResult(SourceLocation, Expr *, unsigned)> GetInit)
Definition: SemaDeclCXX.cpp:873
clang::CXXRecordDecl::setIsParsingBaseSpecifiers
void setIsParsingBaseSpecifiers()
Definition: DeclCXX.h:569
clang::OCD_AllCandidates
Requests that all candidates be shown.
Definition: Overload.h:68
clang::ParmVarDecl::hasUninstantiatedDefaultArg
bool hasUninstantiatedDefaultArg() const
Definition: Decl.h:1713
clang::FriendTemplateDecl::Create
static FriendTemplateDecl * Create(ASTContext &Context, DeclContext *DC, SourceLocation Loc, MutableArrayRef< TemplateParameterList *> Params, FriendUnion Friend, SourceLocation FriendLoc)
Definition: DeclTemplate.cpp:1054
clang::CXXBasePaths::getOrigin
CXXRecordDecl * getOrigin() const
Retrieve the type from which this base-paths search began.
Definition: CXXInheritance.h:228
BuildImplicitBaseInitializer
static bool BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, ImplicitInitializerKind ImplicitInitKind, CXXBaseSpecifier *BaseSpec, bool IsInheritedVirtualBase, CXXCtorInitializer *&CXXBaseInit)
Definition: SemaDeclCXX.cpp:4533
clang::LookupResult::NotFound
No entity found met the criteria.
Definition: Lookup.h:50
CheckOperatorDeleteDeclaration
static bool CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl)
Definition: SemaDeclCXX.cpp:14943
clang::Sema::MarkVTableUsed
void MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, bool DefinitionRequired=false)
Note that the vtable for the given class was used at the given location.
Definition: SemaDeclCXX.cpp:16737
clang::FunctionDecl::getMinRequiredArguments
unsigned getMinRequiredArguments() const
Returns the minimum number of arguments needed to call this function.
Definition: Decl.cpp:3263
clang::TSK_ExplicitInstantiationDefinition
This template specialization was instantiated from a template due to an explicit instantiation defini...
Definition: Specifiers.h:193
clang::TSK_Undeclared
This template specialization was formed from a template-id but has not yet been declared, defined, or instantiated.
Definition: Specifiers.h:178
clang::Sema::CheckUsingDeclRedeclaration
bool CheckUsingDeclRedeclaration(SourceLocation UsingLoc, bool HasTypenameKeyword, const CXXScopeSpec &SS, SourceLocation NameLoc, const LookupResult &Previous)
Checks that the given using declaration is not an invalid redeclaration.
Definition: SemaDeclCXX.cpp:11857
clang::Sema::BuildReferenceType
QualType BuildReferenceType(QualType T, bool LValueRef, SourceLocation Loc, DeclarationName Entity)
Build a reference type.
Definition: SemaType.cpp:2081
clang::TemplateParameterList::getRAngleLoc
SourceLocation getRAngleLoc() const
Definition: DeclTemplate.h:197
clang::FunctionDecl::isExplicitlyDefaulted
bool isExplicitlyDefaulted() const
Whether this function is explicitly defaulted per C++0x.
Definition: Decl.h:2135
memcpy
__DEVICE__ void * memcpy(void *__a, const void *__b, size_t __c)
Definition: __clang_cuda_device_functions.h:1632
clang::DeclSpec::getInlineSpecLoc
SourceLocation getInlineSpecLoc() const
Definition: DeclSpec.h:573
clang::getComparisonCategoryForBuiltinCmp
Optional< ComparisonCategoryType > getComparisonCategoryForBuiltinCmp(QualType T)
Get the comparison category that should be used when comparing values of type T.
Definition: ComparisonCategories.cpp:23
clang::Sema::getDefaultedFunctionKind
DefaultedFunctionKind getDefaultedFunctionKind(const FunctionDecl *FD)
Determine the kind of defaulting that would be done for a given function.
Definition: SemaDeclCXX.cpp:6122
clang::ASTContext::AutoDeductTy
QualType AutoDeductTy
Definition: ASTContext.h:1064
clang::LookupResult::Filter::next
NamedDecl * next()
Definition: Lookup.h:643
clang::OverloadCandidateSet
OverloadCandidateSet - A set of overload candidates, used in C++ overload resolution (C++ 13...
Definition: Overload.h:896
clang::ParmVarDecl::setHasInheritedDefaultArg
void setHasInheritedDefaultArg(bool I=true)
Definition: Decl.h:1729
clang::RecordDecl::hasFlexibleArrayMember
bool hasFlexibleArrayMember() const
Definition: Decl.h:3802
clang::CXXRecordDecl::defaultedCopyConstructorIsDeleted
bool defaultedCopyConstructorIsDeleted() const
true if a defaulted copy constructor for this class would be deleted.
Definition: DeclCXX.h:676
clang::CXXScopeSpec::isInvalid
bool isInvalid() const
An error occurred during parsing of the scope specifier.
Definition: DeclSpec.h:194
checkTupleLikeDecomposition
static bool checkTupleLikeDecomposition(Sema &S, ArrayRef< BindingDecl *> Bindings, VarDecl *Src, QualType DecompType, const llvm::APSInt &TupleSize)
Definition: SemaDeclCXX.cpp:1117
clang::EST_DynamicNone
throw()
Definition: ExceptionSpecificationType.h:22
clang::FunctionDecl::isTrivialForCall
bool isTrivialForCall() const
Definition: Decl.h:2125
clang::ASTContext::hasSameUnqualifiedType
bool hasSameUnqualifiedType(QualType T1, QualType T2) const
Determine whether the given types are equivalent after cvr-qualifiers have been removed.
Definition: ASTContext.h:2345
clang::TemplateArgumentListInfo::addArgument
void addArgument(const TemplateArgumentLoc &Loc)
Definition: TemplateBase.h:594
clang::Decl::isOutOfLine
virtual bool isOutOfLine() const
Determine whether this declaration is declared out of line (outside its semantic context).
Definition: Decl.cpp:99
clang::MultiVersionKind::None
clang::FunctionProtoType::getExceptionSpecType
ExceptionSpecificationType getExceptionSpecType() const
Get the kind of exception specification on this function.
Definition: Type.h:3989
clang::Expr::getExprLoc
SourceLocation getExprLoc() const LLVM_READONLY
getExprLoc - Return the preferred location for the arrow when diagnosing a problem with a generic exp...
Definition: Expr.cpp:224
clang::ASTContext::getArrayDecayedType
QualType getArrayDecayedType(QualType T) const
Return the properly qualified result of decaying the specified array type to a pointer.
Definition: ASTContext.cpp:5800
clang::ArrayTypeLoc::getElementLoc
TypeLoc getElementLoc() const
Definition: TypeLoc.h:1517
clang::CXXRecordDecl::hasInClassInitializer
bool hasInClassInitializer() const
Whether this class has any in-class initializers for non-static data members (including those in anon...
Definition: DeclCXX.h:1061
clang::VirtSpecifiers::getLastLocation
SourceLocation getLastLocation() const
Definition: DeclSpec.h:2616
clang::Sema::DeclareImplicitDestructor
CXXDestructorDecl * DeclareImplicitDestructor(CXXRecordDecl *ClassDecl)
Declare the implicit destructor for the given class.
Definition: SemaDeclCXX.cpp:12855
clang::BinaryOperator::getLHS
Expr * getLHS() const
Definition: Expr.h:3474
clang::TypeAliasDecl::Create
static TypeAliasDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, SourceLocation IdLoc, IdentifierInfo *Id, TypeSourceInfo *TInfo)
Definition: Decl.cpp:4853
clang::DeclAccessPair
A POD class for pairing a NamedDecl* with an access specifier.
Definition: DeclAccessPair.h:29
clang::Type::isUndeducedAutoType
bool isUndeducedAutoType() const
Definition: Type.h:6635
clang::InheritedConstructor::getConstructor
CXXConstructorDecl * getConstructor() const
Definition: DeclCXX.h:2370
clang::IdentifierInfo::getName
StringRef getName() const
Return the actual identifier string.
Definition: IdentifierTable.h:155
clang::Sema::BuildDelegatingInitializer
MemInitResult BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, CXXRecordDecl *ClassDecl)
Definition: SemaDeclCXX.cpp:4321
clang::Declarator::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
Get the source range that spans this declarator.
Definition: DeclSpec.h:1930
clang::DeclSpec::TQ
TQ
Definition: DeclSpec.h:313
checkForMultipleExportedDefaultConstructors
static void checkForMultipleExportedDefaultConstructors(Sema &S, CXXRecordDecl *Class)
Definition: SemaDeclCXX.cpp:5842
clang::Sema::ActOnExceptionDeclarator
Decl * ActOnExceptionDeclarator(Scope *S, Declarator &D)
ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch handler.
Definition: SemaDeclCXX.cpp:15527
clang::Sema::diagnoseTypo
void diagnoseTypo(const TypoCorrection &Correction, const PartialDiagnostic &TypoDiag, bool ErrorRecovery=true)
Definition: SemaLookup.cpp:5296
clang::TypedefNameDecl
Base class for declarations which introduce a typedef-name.
Definition: Decl.h:3071
clang::ComparisonCategories::lookupInfo
const ComparisonCategoryInfo * lookupInfo(ComparisonCategoryType Kind) const
Return the cached comparison category information for the specified &#39;Kind&#39;.
Definition: ComparisonCategories.cpp:111
Node
ast_type_traits::DynTypedNode Node
Definition: ASTMatchFinder.cpp:60
clang::ASTContext::CharTy
CanQualType CharTy
Definition: ASTContext.h:1018
clang::VarDecl::TLS_Dynamic
TLS with a dynamic initializer.
Definition: Decl.h:843
clang::TemplateArgument
Represents a template argument.
Definition: TemplateBase.h:50
clang::FunctionDecl::setBody
void setBody(Stmt *B)
Definition: Decl.cpp:2906
clang::TagTypeKind
TagTypeKind
The kind of a tag type.
Definition: Type.h:5187
isInvalid
static bool isInvalid(LocType Loc, bool *Invalid)
Definition: SourceManager.cpp:1199
clang::ObjCImplDecl::getClassInterface
const ObjCInterfaceDecl * getClassInterface() const
Definition: DeclObjC.h:2454
clang::CXXRecordDecl::hasNonTrivialCopyConstructorForCall
bool hasNonTrivialCopyConstructorForCall() const
Definition: DeclCXX.h:1196
clang::ParmVarDecl::Create
static ParmVarDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, SourceLocation IdLoc, IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, StorageClass S, Expr *DefArg)
Definition: Decl.cpp:2672
clang::LinkageSpecDecl::Create
static LinkageSpecDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation ExternLoc, SourceLocation LangLoc, LanguageIDs Lang, bool HasBraces)
Definition: DeclCXX.cpp:2691
clang
Dataflow Directional Tag Classes.
Definition: CFGReachabilityAnalysis.h:21
clang::TypeAliasDecl::setDescribedAliasTemplate
void setDescribedAliasTemplate(TypeAliasTemplateDecl *TAT)
Definition: Decl.h:3211
DelegatingCycleHelper
static void DelegatingCycleHelper(CXXConstructorDecl *Ctor, llvm::SmallPtrSet< CXXConstructorDecl *, 4 > &Valid, llvm::SmallPtrSet< CXXConstructorDecl *, 4 > &Invalid, llvm::SmallPtrSet< CXXConstructorDecl *, 4 > &Current, Sema &S)
Definition: SemaDeclCXX.cpp:16991
clang::SourceLocation::isValid
bool isValid() const
Return true if this is a valid SourceLocation object.
Definition: SourceLocation.h:106
clang::Sema::DeclareImplicitCopyConstructor
CXXConstructorDecl * DeclareImplicitCopyConstructor(CXXRecordDecl *ClassDecl)
Declare the implicit copy constructor for the given class.
Definition: SemaDeclCXX.cpp:14165
clang::Type::getContainedDeducedType
DeducedType * getContainedDeducedType() const
Get the DeducedType whose type will be deduced for a variable with an initializer of this type...
Definition: Type.cpp:1808
clang::Sema::HandleMSProperty
MSPropertyDecl * HandleMSProperty(Scope *S, RecordDecl *TagD, SourceLocation DeclStart, Declarator &D, Expr *BitfieldWidth, InClassInitStyle InitStyle, AccessSpecifier AS, const ParsedAttr &MSPropertyAttr)
HandleMSProperty - Analyze a __delcspec(property) field of a C++ class.
Definition: SemaDeclCXX.cpp:17298
clang::TemplateArgumentLoc::getArgument
const TemplateArgument & getArgument() const
Definition: TemplateBase.h:498
clang::EST_Unevaluated
not evaluated yet, for special member function
Definition: ExceptionSpecificationType.h:30
clang::DeclContext
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1271
clang::ExplicitSpecifier::setExpr
void setExpr(Expr *E)
Definition: DeclCXX.h:1821
clang::StructuralEquivalenceKind::Default
clang::TemplateDecl
The base class of all kinds of template declarations (e.g., class, function, etc.).
Definition: DeclTemplate.h:402
clang::OverloadedOperatorKind
OverloadedOperatorKind
Enumeration specifying the different kinds of C++ overloaded operators.
Definition: OperatorKinds.h:21
clang::DeclSpec::TST_auto
static const TST TST_auto
Definition: DeclSpec.h:303
clang::CXXMethodDecl::begin_overridden_methods
method_iterator begin_overridden_methods() const
Definition: DeclCXX.cpp:2287
clang::Scope::getParent
const Scope * getParent() const
getParent - Return the scope that this is nested in.
Definition: Scope.h:228
clang::Sema::ImpCastExprToType
ExprResult ImpCastExprToType(Expr *E, QualType Type, CastKind CK, ExprValueKind VK=VK_RValue, const CXXCastPath *BasePath=nullptr, CheckedConversionKind CCK=CCK_ImplicitConversion)
ImpCastExprToType - If Expr is not of type &#39;Type&#39;, insert an implicit cast.
Definition: Sema.cpp:529
AddMostOverridenMethods
static void AddMostOverridenMethods(const CXXMethodDecl *MD, llvm::SmallPtrSetImpl< const CXXMethodDecl *> &Methods)
Add the most overriden methods from MD to Methods.
Definition: SemaDeclCXX.cpp:9356
clang::TypeLoc::getType
QualType getType() const
Get the type for which this source info wrapper provides information.
Definition: TypeLoc.h:132
clang::Sema::ActOnForStmt
StmtResult ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc, Stmt *First, ConditionResult Second, FullExprArg Third, SourceLocation RParenLoc, Stmt *Body)
Definition: SemaStmt.cpp:1763
clang::DeclaratorChunk::FunctionTypeInfo::isVariadic
unsigned isVariadic
isVariadic - If this function has a prototype, and if that proto ends with &#39;,...)&#39;, this is true.
Definition: DeclSpec.h:1284
clang::FunctionDecl::getTemplateSpecializationKind
TemplateSpecializationKind getTemplateSpecializationKind() const
Determine what kind of template instantiation this function represents.
Definition: Decl.cpp:3756
clang::CXXThisExpr::isImplicit
bool isImplicit() const
Definition: ExprCXX.h:1118
clang::DeclContext::isRecord
bool isRecord() const
Definition: DeclBase.h:1863
clang::Decl::attrs
attr_range attrs() const
Definition: DeclBase.h:501
clang::Sema::CXXMoveConstructor
Definition: Sema.h:1243
clang::TemplateIdAnnotation::RAngleLoc
SourceLocation RAngleLoc
The location of the &#39;>&#39; after the template argument list.
Definition: ParsedTemplate.h:181
InitializationHasSideEffects
static bool InitializationHasSideEffects(const FieldDecl &FD)
Definition: SemaDeclCXX.cpp:3077
CheckConstexprDestructorSubobjects
static bool CheckConstexprDestructorSubobjects(Sema &SemaRef, const CXXDestructorDecl *DD, Sema::CheckConstexprKind Kind)
Determine whether a destructor cannot be constexpr due to.
Definition: SemaDeclCXX.cpp:1601
clang::CXXRecordDecl::hasTrivialDestructorForCall
bool hasTrivialDestructorForCall() const
Definition: DeclCXX.h:1273
clang::CXXMethodDecl::getMethodQualifiers
Qualifiers getMethodQualifiers() const
Definition: DeclCXX.h:2076
clang::CXXBaseSpecifier::getBaseTypeLoc
SourceLocation getBaseTypeLoc() const LLVM_READONLY
Get the location at which the base class type was written.
Definition: DeclCXX.h:193
clang::IndirectFieldDecl
Represents a field injected from an anonymous union/struct into the parent scope. ...
Definition: Decl.h:2980
clang::Sema::ActOnParamDefaultArgument
void ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, Expr *defarg)
ActOnParamDefaultArgument - Check whether the default argument provided for a function parameter is w...
Definition: SemaDeclCXX.cpp:299
clang::CXXConstructorDecl::isCopyConstructor
bool isCopyConstructor(unsigned &TypeQuals) const
Whether this constructor is a copy constructor (C++ [class.copy]p2, which can be used to copy the cla...
Definition: DeclCXX.cpp:2529
clang::CXXCtorInitializer::getSourceLocation
SourceLocation getSourceLocation() const
Determine the source location of the initializer.
Definition: DeclCXX.cpp:2425
clang::TypedefNameDecl::getUnderlyingType
QualType getUnderlyingType() const
Definition: Decl.h:3126
clang::ASTContext::UnsignedLongLongTy
CanQualType UnsignedLongLongTy
Definition: ASTContext.h:1027
clang::NestedNameSpecifier::isDependent
bool isDependent() const
Whether this nested name specifier refers to a dependent type or not.
Definition: NestedNameSpecifier.cpp:202
clang::FixItHint::CreateRemoval
static FixItHint CreateRemoval(CharSourceRange RemoveRange)
Create a code modification hint that removes the given source range.
Definition: Diagnostic.h:118
clang::AttributeCommonInfo::IgnoredAttribute
Definition: AttributeCommonInfo.h:57
clang::Decl::getAccess
AccessSpecifier getAccess() const
Definition: DeclBase.h:473
clang::VarDecl::getInit
const Expr * getInit() const
Definition: Decl.h:1229
clang::DecompositionDecl
A decomposition declaration.
Definition: DeclCXX.h:3869
clang::OverridingMethods::iterator
MapType::iterator iterator
Definition: CXXInheritance.h:288
clang::DeclContext::getOuterLexicalRecordContext
RecordDecl * getOuterLexicalRecordContext()
Retrieve the outermost lexically enclosing record context.
Definition: DeclBase.cpp:1773
clang::TSK_ExplicitInstantiationDeclaration
This template specialization was instantiated from a template due to an explicit instantiation declar...
Definition: Specifiers.h:189
getNamespaceDecl
static NamespaceDecl * getNamespaceDecl(NamedDecl *D)
getNamespaceDecl - Returns the namespace a decl represents.
Definition: SemaDeclCXX.cpp:10606
clang::CXXRecordDecl::hasUserDeclaredConstructor
bool hasUserDeclaredConstructor() const
Determine whether this class has any user-declared constructors.
Definition: DeclCXX.h:747
clang::TemplateTypeParmDecl::getIndex
unsigned getIndex() const
Retrieve the index of the template parameter.
Definition: DeclTemplate.cpp:646
clang::DeclaratorChunk::MemberPointer
Definition: DeclSpec.h:1176
clang::Sema::CheckCompleteDecompositionDeclaration
void CheckCompleteDecompositionDeclaration(DecompositionDecl *DD)
Definition: SemaDeclCXX.cpp:1415
clang::UnresolvedUsingTypenameDecl
Represents a dependent using declaration which was marked with typename.
Definition: DeclCXX.h:3684
clang::UsingDirectiveDecl::Create
static UsingDirectiveDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation UsingLoc, SourceLocation NamespaceLoc, NestedNameSpecifierLoc QualifierLoc, SourceLocation IdentLoc, NamedDecl *Nominated, DeclContext *CommonAncestor)
Definition: DeclCXX.cpp:2708
clang::TargetCXXABI::areArgsDestroyedLeftToRightInCallee
bool areArgsDestroyedLeftToRightInCallee() const
Are arguments to a call destroyed left to right in the callee? This is a fundamental language change...
Definition: TargetCXXABI.h:217
clang::FunctionDecl::setWillHaveBody
void setWillHaveBody(bool V=true)
Definition: Decl.h:2348
clang::TypoCorrection::getCorrectionDecl
NamedDecl * getCorrectionDecl() const
Gets the pointer to the declaration of the typo correction.
Definition: TypoCorrection.h:151
clang::DeclarationName
The name of a declaration.
Definition: DeclarationName.h:145
clang::Stmt::getStmtClass
StmtClass getStmtClass() const
Definition: Stmt.h:1109
clang::FunctionProtoType::exceptions
ArrayRef< QualType > exceptions() const
Definition: Type.h:4133
clang::ParsedAttributesView
Definition: ParsedAttr.h:728
clang::LookupResult::getFoundDecl
NamedDecl * getFoundDecl() const
Fetch the unique decl found by this lookup.
Definition: Lookup.h:517
clang::DeclGroupRef
Definition: DeclGroup.h:51
clang::ParmVarDecl::getDefaultArg
Expr * getDefaultArg()
Definition: Decl.cpp:2710
clang::NamedDecl::isCXXClassMember
bool isCXXClassMember() const
Determine whether this declaration is a C++ class member.
Definition: Decl.h:328
clang::CXXMethodDecl::getParent
const CXXRecordDecl * getParent() const
Return the parent of this method declaration, which is the class in which this method is defined...
Definition: DeclCXX.h:2046
clang::CXXConstructorDecl::isMoveConstructor
bool isMoveConstructor(unsigned &TypeQuals) const
Determine whether this constructor is a move constructor (C++11 [class.copy]p3), which can be used to...
Definition: DeclCXX.cpp:2534
clang::Sema::SpecialMembersBeingDeclared
llvm::SmallPtrSet< SpecialMemberDecl, 4 > SpecialMembersBeingDeclared
The C++ special members which we are currently in the process of declaring.
Definition: Sema.h:1256
clang::CXXCtorInitializer::getBaseClass
const Type * getBaseClass() const
If this is a base class initializer, returns the type of the base class.
Definition: DeclCXX.cpp:2418
clang::Sema::VTableUse
std::pair< CXXRecordDecl *, SourceLocation > VTableUse
The list of classes whose vtables have been used within this translation unit, and the source locatio...
Definition: Sema.h:6498
clang::UnresolvedSet
A set of unresolved declarations.
Definition: UnresolvedSet.h:148
clang::CXXFinalOverriderMap
A mapping from each virtual member function to its set of final overriders.
Definition: CXXInheritance.h:368
clang::Qualifiers::Volatile
Definition: Type.h:148
clang::DeclaratorDecl::getNumTemplateParameterLists
unsigned getNumTemplateParameterLists() const
Definition: Decl.h:759
clang::EnumDecl
Represents an enum.
Definition: Decl.h:3481
clang::ComparisonCategoryInfo::Record
CXXRecordDecl * Record
The declaration for the comparison category type from the standard library.
Definition: ComparisonCategories.h:118
clang::CXXBasePaths::isAmbiguous
bool isAmbiguous(CanQualType BaseType)
Determine whether the path from the most-derived type to the given base type is ambiguous (i...
Definition: CXXInheritance.cpp:63
clang::MemberPointerType
A pointer to member type per C++ 8.3.3 - Pointers to members.
Definition: Type.h:2833
clang::VarDecl::isParameterPack
bool isParameterPack() const
Determine whether this variable is actually a function parameter pack or init-capture pack...
Definition: Decl.cpp:2464
clang::Sema::CheckOverloadedOperatorDeclaration
bool CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl)
CheckOverloadedOperatorDeclaration - Check whether the declaration of this overloaded operator is wel...
Definition: SemaDeclCXX.cpp:14987
clang::TemplateSpecializationKind
TemplateSpecializationKind
Describes the kind of template specialization that a particular template specialization declaration r...
Definition: Specifiers.h:175
clang::PseudoObjectExpr::semantics_begin
semantics_iterator semantics_begin()
Definition: Expr.h:5783
clang::DeclarationName::CXXDestructorName
Definition: DeclarationName.h:207
clang::FunctionDecl::isDestroyingOperatorDelete
bool isDestroyingOperatorDelete() const
Determine whether this is a destroying operator delete.
Definition: Decl.cpp:3057
clang::Sema::FullExprArg::get
Expr * get() const
Definition: Sema.h:4072
clang::DeclarationName::CXXConversionFunctionName
Definition: DeclarationName.h:208
clang::TemplateArgumentListInfo::arguments
llvm::ArrayRef< TemplateArgumentLoc > arguments() const
Definition: TemplateBase.h:582
clang::DeclarationNameInfo
DeclarationNameInfo - A collector data type for bundling together a DeclarationName and the correspnd...
Definition: DeclarationName.h:690
clang::Sema::BuildBaseInitializer
MemInitResult BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, Expr *Init, CXXRecordDecl *ClassDecl, SourceLocation EllipsisLoc)
Definition: SemaDeclCXX.cpp:4378
clang::ASTContext::getExternalSource
ExternalASTSource * getExternalSource() const
Retrieve a pointer to the external AST source associated with this AST context, if any...
Definition: ASTContext.h:1086
clang::DeclSpec::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: DeclSpec.h:510
clang::Sema::DefaultedFunctionKind::isSpecialMember
bool isSpecialMember() const
Definition: Sema.h:2624
clang::Sema::AddInitializerToDecl
void AddInitializerToDecl(Decl *dcl, Expr *init, bool DirectInit)
AddInitializerToDecl - Adds the initializer Init to the declaration dcl.
Definition: SemaDecl.cpp:11689
clang::Type::isUndeducedType
bool isUndeducedType() const
Determine whether this type is an undeduced type, meaning that it somehow involves a C++11 &#39;auto&#39; typ...
Definition: Type.h:6900
clang::ExplicitSpecKind::ResolvedFalse
clang::CXXRecordDecl::friends
friend_range friends() const
Definition: DeclFriend.h:247
clang::CXXScopeSpec::isValid
bool isValid() const
A scope specifier is present, and it refers to a real scope.
Definition: DeclSpec.h:196
clang::Expr::IgnoreParenImpCasts
Expr * IgnoreParenImpCasts() LLVM_READONLY
Skip past any parentheses and implicit casts which might surround this expression until reaching a fi...
Definition: Expr.cpp:2990
clang::Scope::PushUsingDirective
void PushUsingDirective(UsingDirectiveDecl *UDir)
Definition: Scope.h:466
clang::Sema::DeclareImplicitDefaultConstructor
CXXConstructorDecl * DeclareImplicitDefaultConstructor(CXXRecordDecl *ClassDecl)
Declare the implicit default constructor for the given class.
Definition: SemaDeclCXX.cpp:12573
clang::Qualifiers::addConst
void addConst()
Definition: Type.h:263
clang::Sema::InheritedConstructorInfo::findConstructorForBase
std::pair< CXXConstructorDecl *, bool > findConstructorForBase(CXXRecordDecl *Base, CXXConstructorDecl *Ctor) const
Find the constructor to use for inherited construction of a base class, and whether that base class c...
Definition: SemaDeclCXX.cpp:6681
clang::Sema::CodeSynthesisContext::DeclaringImplicitEqualityComparison
We are declaring an implicit &#39;operator==&#39; for a defaulted &#39;operator<=>&#39;.
Definition: Sema.h:8046
clang::DeclSpec::forEachQualifier
void forEachQualifier(llvm::function_ref< void(TQ, StringRef, SourceLocation)> Handle)
This method calls the passed in handler on each qual being set.
Definition: DeclSpec.cpp:421
clang::TemplateParameterList::getDepth
unsigned getDepth() const
Get the depth of this template parameter list in the set of template parameter lists.
Definition: DeclTemplate.cpp:141
clang::FunctionTypeLoc::getNumParams
unsigned getNumParams() const
Definition: TypeLoc.h:1426
clang::TargetInfo::CCK_MicrosoftWin64
Definition: TargetInfo.h:1306
clang::DependentNameTypeLoc::setNameLoc
void setNameLoc(SourceLocation Loc)
Definition: TypeLoc.h:2175
clang::Sema::LookupOverloadedOperatorName
void LookupOverloadedOperatorName(OverloadedOperatorKind Op, Scope *S, QualType T1, QualType T2, UnresolvedSetImpl &Functions)
Definition: SemaLookup.cpp:3067
clang::Sema::LookupSpecialMember
SpecialMemberOverloadResult LookupSpecialMember(CXXRecordDecl *D, CXXSpecialMember SM, bool ConstArg, bool VolatileArg, bool RValueThis, bool ConstThis, bool VolatileThis)
Definition: SemaLookup.cpp:3084
clang::CXXDestructorDecl::getOperatorDelete
const FunctionDecl * getOperatorDelete() const
Definition: DeclCXX.h:2683
clang::TypeLoc::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
Get the full source range.
Definition: TypeLoc.h:152
getImplicitMethodEPI
static FunctionProtoType::ExtProtoInfo getImplicitMethodEPI(Sema &S, CXXMethodDecl *MD)
Definition: SemaDeclCXX.cpp:6887
clang::UsingShadowDecl::getUsingDecl
UsingDecl * getUsingDecl() const
Gets the using declaration to which this declaration is tied.
Definition: DeclCXX.cpp:2875
clang::Scope::RemoveDecl
void RemoveDecl(Decl *D)
Definition: Scope.h:293
clang::LookupResult::Found
Name lookup found a single declaration that met the criteria.
Definition: Lookup.h:59
clang::CXXRecordDecl::needsOverloadResolutionForMoveConstructor
bool needsOverloadResolutionForMoveConstructor() const
Determine whether we need to eagerly declare a defaulted move constructor for this class...
Definition: DeclCXX.h:862
clang::Sema::isCurrentClassName
bool isCurrentClassName(const IdentifierInfo &II, Scope *S, const CXXScopeSpec *SS=nullptr)
isCurrentClassName - Determine whether the identifier II is the name of the class type currently bein...
Definition: SemaDeclCXX.cpp:2345
clang::ASTContext::getIntWidth
unsigned getIntWidth(QualType T) const
Definition: ASTContext.cpp:9465
clang::ObjCImplementationDecl
ObjCImplementationDecl - Represents a class definition - this is where method definitions are specifi...
Definition: DeclObjC.h:2566
clang::OO_None
Not an overloaded operator.
Definition: OperatorKinds.h:22
clang::CXXRecordDecl::MergeAccess
static AccessSpecifier MergeAccess(AccessSpecifier PathAccess, AccessSpecifier DeclAccess)
Calculates the access of a decl that is reached along a path.
Definition: DeclCXX.h:1665
clang::Type::isIncompleteArrayType
bool isIncompleteArrayType() const
Definition: Type.h:6578
clang::CXXRecordDecl::lookupInBases
bool lookupInBases(BaseMatchesCallback BaseMatches, CXXBasePaths &Paths, bool LookupInDependent=false) const
Look for entities within the base classes of this C++ class, transitively searching all base class su...
Definition: CXXInheritance.cpp:340
clang::RecordType
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4495
clang::ComplexType
Complex values, per C99 6.2.5p11.
Definition: Type.h:2554
clang::TemplateArgumentLoc
Location wrapper for a TemplateArgument.
Definition: TemplateBase.h:449
CheckOperatorNewDeclaration
static bool CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl)
Definition: SemaDeclCXX.cpp:14912
clang::OverridingMethods::const_iterator
MapType::const_iterator const_iterator
Definition: CXXInheritance.h:289
clang::ParmVarDecl::setUnparsedDefaultArg
void setUnparsedDefaultArg()
Specify that this parameter has an unparsed default argument.
Definition: Decl.h:1721
clang::ParmVarDecl::getUninstantiatedDefaultArg
Expr * getUninstantiatedDefaultArg()
Definition: Decl.cpp:2752
clang::Sema::CheckLiteralOperatorDeclaration
bool CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl)
CheckLiteralOperatorDeclaration - Check whether the declaration of this literal operator function is ...
Definition: SemaDeclCXX.cpp:15167
clang::Sema::MarkVirtualMembersReferenced
void MarkVirtualMembersReferenced(SourceLocation Loc, const CXXRecordDecl *RD, bool ConstexprOnly=false)
MarkVirtualMembersReferenced - Will mark all members of the given CXXRecordDecl referenced.
Definition: SemaDeclCXX.cpp:16900
clang::ReferenceTypeLoc
Definition: TypeLoc.h:1307
clang::VarDecl::checkInitIsICE
bool checkInitIsICE() const
Determine whether the value of the initializer attached to this declaration is an integral constant e...
Definition: Decl.cpp:2428
clang::DeclSpec::getTypeQualifiers
unsigned getTypeQualifiers() const
getTypeQualifiers - Return a set of TQs.
Definition: DeclSpec.h:550
extendRight
static void extendRight(SourceRange &R, SourceRange After)
Definition: SemaDeclCXX.cpp:10046
clang::Type::getCanonicalTypeInternal
QualType getCanonicalTypeInternal() const
Definition: Type.h:2429
clang::DeclSpec::getVirtualSpecLoc
SourceLocation getVirtualSpecLoc() const
Definition: DeclSpec.h:582
clang::CXXCtorInitializer
Represents a C++ base or member initializer.
Definition: DeclCXX.h:2155
clang::LinkageSpecDecl::LanguageIDs
LanguageIDs
Represents the language in a linkage specification.
Definition: DeclCXX.h:2787
clang::Type::isIntegerType
bool isIntegerType() const
isIntegerType() does not include complex integers (a GCC extension).
Definition: Type.h:6811
clang::DependentNameTypeLoc
Definition: TypeLoc.h:2146
clang::TSK_ExplicitSpecialization
This template specialization was declared or defined by an explicit specialization (C++ [temp...
Definition: Specifiers.h:185
clang::DeclarationNameInfo::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
getSourceRange - The range of the declaration name.
Definition: DeclarationName.h:801
clang::CXXRecordDecl::needsOverloadResolutionForMoveAssignment
bool needsOverloadResolutionForMoveAssignment() const
Determine whether we need to eagerly declare a move assignment operator for this class.
Definition: DeclCXX.h:936
clang::FunctionDecl::setConstexprKind
void setConstexprKind(ConstexprSpecKind CSK)
Definition: Decl.h:2203
clang::QualType::hasNonTrivialObjCLifetime
bool hasNonTrivialObjCLifetime() const
Definition: Type.h:1084
clang::CXXCtorInitializer::getIndirectMember
IndirectFieldDecl * getIndirectMember() const
Definition: DeclCXX.h:2305
clang::Decl::getAttr
T * getAttr() const
Definition: DeclBase.h:538
clang::Sema::ActOnCXXBoolLiteral
ExprResult ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind)
ActOnCXXBoolLiteral - Parse {true,false} literals.
Definition: SemaExprCXX.cpp:707
clang::Declarator::type_objects
type_object_range type_objects() const
Returns the range of type objects, from the identifier outwards.
Definition: DeclSpec.h:2237
clang::Sema::CheckDerivedToBaseConversion
bool CheckDerivedToBaseConversion(QualType Derived, QualType Base, SourceLocation Loc, SourceRange Range, CXXCastPath *BasePath=nullptr, bool IgnoreAccess=false)
Definition: SemaDeclCXX.cpp:2910
clang::ConstantArrayType::getSize
const llvm::APInt & getSize() const
Definition: Type.h:2958
clang::ASTContext::DependentTy
CanQualType DependentTy
Definition: ASTContext.h:1045
clang::DeclRefExpr::Create
static DeclRefExpr * Create(const ASTContext &Context, NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc, ValueDecl *D, bool RefersToEnclosingVariableOrCapture, SourceLocation NameLoc, QualType T, ExprValueKind VK, NamedDecl *FoundD=nullptr, const TemplateArgumentListInfo *TemplateArgs=nullptr, NonOdrUseReason NOUR=NOUR_None)
Definition: Expr.cpp:545
clang::Type::isFunctionType
bool isFunctionType() const
Definition: Type.h:6500
clang::Declarator::getTemplateParameterLists
ArrayRef< TemplateParameterList * > getTemplateParameterLists() const
The template parameter lists that preceded the declarator.
Definition: DeclSpec.h:2462
TrivialSubobjectKind
TrivialSubobjectKind
The kind of subobject we are checking for triviality.
Definition: SemaDeclCXX.cpp:9026
clang::VarDecl::isStaticLocal
bool isStaticLocal() const
Returns true if a variable with function scope is a static local variable.
Definition: Decl.h:1069
clang::Sema::ActOnCXXMemberDeclarator
NamedDecl * ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, MultiTemplateParamsArg TemplateParameterLists, Expr *BitfieldWidth, const VirtSpecifiers &VS, InClassInitStyle InitStyle)
ActOnCXXMemberDeclarator - This is invoked when a C++ class member declarator is parsed.
Definition: SemaDeclCXX.cpp:3154
GetKeyForBase
static const void * GetKeyForBase(ASTContext &Context, QualType BaseType)
Definition: SemaDeclCXX.cpp:5158
clang::DeclaratorDecl::getTypeSourceInfo
TypeSourceInfo * getTypeSourceInfo() const
Definition: Decl.h:700
clang::ClassTemplateDecl::getCanonicalDecl
ClassTemplateDecl * getCanonicalDecl() override
Retrieves the canonical declaration of this template.
Definition: DeclTemplate.h:2315
clang::CXXBasePaths::front
CXXBasePath & front()
Definition: CXXInheritance.h:196
clang::UnaryOperator::getOpcode
Opcode getOpcode() const
Definition: Expr.h:2071
CheckConstexprFunctionStmt
static bool CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S, SmallVectorImpl< SourceLocation > &ReturnStmts, SourceLocation &Cxx1yLoc, SourceLocation &Cxx2aLoc, Sema::CheckConstexprKind Kind)
Check the provided statement is allowed in a constexpr function definition.
Definition: SemaDeclCXX.cpp:1970
clang::CXXConstructExpr::getArg
Expr * getArg(unsigned Arg)
Return the specified argument.
Definition: ExprCXX.h:1573
clang::Sema::isImplicitlyDeleted
bool isImplicitlyDeleted(FunctionDecl *FD)
Determine whether the given function is an implicitly-deleted special member function.
Definition: SemaDeclCXX.cpp:14430
clang::ReferenceType
Base for LValueReferenceType and RValueReferenceType.
Definition: Type.h:2750
clang::DeclContext::getRedeclContext
DeclContext * getRedeclContext()
getRedeclContext - Retrieve the context in which an entity conflicts with other entities of the same ...
Definition: DeclBase.cpp:1747
clang::ASTContext::hasSameType
bool hasSameType(QualType T1, QualType T2) const
Determine whether the given types T1 and T2 are equivalent.
Definition: ASTContext.h:2321
clang::DeclStmt::decls
decl_range decls()
Definition: Stmt.h:1273
clang::UsingShadowDecl::Create
static UsingShadowDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation Loc, UsingDecl *Using, NamedDecl *Target)
Definition: DeclCXX.h:3197
clang::ASTContext::getAutoDeductType
QualType getAutoDeductType() const
C++11 deduction pattern for &#39;auto&#39; type.
Definition: ASTContext.cpp:5224
clang::TypeLoc::getTypeLocClass
TypeLocClass getTypeLocClass() const
Definition: TypeLoc.h:115
clang::Sema::BuildFieldReferenceExpr
ExprResult BuildFieldReferenceExpr(Expr *BaseExpr, bool IsArrow, SourceLocation OpLoc, const CXXScopeSpec &SS, FieldDecl *Field, DeclAccessPair FoundDecl, const DeclarationNameInfo &MemberNameInfo)
Definition: SemaExprMember.cpp:1768
clang::Sema::CreateBuiltinUnaryOp
ExprResult CreateBuiltinUnaryOp(SourceLocation OpLoc, UnaryOperatorKind Opc, Expr *InputExpr)
Definition: SemaExpr.cpp:13578
clang::TemplateArgument::Type
The template argument is a type.
Definition: TemplateBase.h:59
clang::ExceptionSpecificationType
ExceptionSpecificationType
The various types of exception specifications that exist in C++11.
Definition: ExceptionSpecificationType.h:20
clang::FunctionProtoType::ExceptionSpecInfo
Holds information about the various types of exception specification.
Definition: Type.h:3811
clang::FixItHint::CreateInsertion
static FixItHint CreateInsertion(SourceLocation InsertionLoc, StringRef Code, bool BeforePreviousInsertions=false)
Create a code modification hint that inserts the given code string at a specific location.
Definition: Diagnostic.h:92
clang::DeclContext::getExternCContext
const LinkageSpecDecl * getExternCContext() const
Retrieve the nearest enclosing C linkage specification context.
Definition: DeclBase.cpp:1146
clang::CXXDestructorDecl::Create
static CXXDestructorDecl * Create(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo, bool isInline, bool isImplicitlyDeclared, ConstexprSpecKind ConstexprKind, Expr *TrailingRequiresClause=nullptr)
Definition: DeclCXX.cpp:2629
clang::DeclContext::addDecl
void addDecl(Decl *D)
Add the declaration D into this context.
Definition: DeclBase.cpp:1524
PartialDiagnostic.h
Implements a partial diagnostic that can be emitted anwyhere in a DiagnosticBuilder stream...
clang::InheritableAttr::setInherited
void setInherited(bool I)
Definition: Attr.h:149
clang::Sema::AbstractFieldType
Definition: Sema.h:6798
clang::LookupResult::getLookupKind
Sema::LookupNameKind getLookupKind() const
Gets the kind of lookup to perform.
Definition: Lookup.h:253
clang::TTK_Class
The "class" keyword.
Definition: Type.h:5198
clang::CXXBaseSpecifier
Represents a base class of a C++ class.
Definition: DeclCXX.h:145
clang::UsingDecl::hasTypename
bool hasTypename() const
Return true if the using declaration has &#39;typename&#39;.
Definition: DeclCXX.h:3424
clang::Sema::isInitListConstructor
bool isInitListConstructor(const FunctionDecl *Ctor)
Determine whether Ctor is an initializer-list constructor, as defined in [dcl.init.list]p2.
Definition: SemaDeclCXX.cpp:10917
clang::Sema::checkClassLevelDLLAttribute
void checkClassLevelDLLAttribute(CXXRecordDecl *Class)
Check class-level dllimport/dllexport attribute.
Definition: SemaDeclCXX.cpp:5891
clang::Sema::CheckComparisonCategoryType
QualType CheckComparisonCategoryType(ComparisonCategoryType Kind, SourceLocation Loc, ComparisonCategoryUsage Usage)
Lookup the specified comparison category types in the standard library, an check the VarDecls possibl...
Definition: SemaDeclCXX.cpp:10687
clang::Decl::markUsed
void markUsed(ASTContext &C)
Mark the declaration used, in the sense of odr-use.
Definition: DeclBase.cpp:413
clang::ASTContext::getTypeSize
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:2104
clang::FunctionProtoType::ExceptionSpecInfo::Exceptions
ArrayRef< QualType > Exceptions
Explicitly-specified list of exception types.
Definition: Type.h:3816
clang::Scope::DeclScope
This is a scope that can contain a declaration.
Definition: Scope.h:59
clang::Type::isObjCObjectType
bool isObjCObjectType() const
Definition: Type.h:6622
clang::BindingDecl::Create
static BindingDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation IdLoc, IdentifierInfo *Id)
Definition: DeclCXX.cpp:3044
clang::ASTContext::Char8Ty
CanQualType Char8Ty
Definition: ASTContext.h:1022
clang::FunctionDecl::isInlined
bool isInlined() const
Determine whether this function should be inlined, because it is either marked "inline" or "constexpr...
Definition: Decl.h:2513
clang::Sema::LookupQualifiedName
bool LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx, bool InUnqualifiedLookup=false)
Perform qualified name lookup into a given context.
Definition: SemaLookup.cpp:2221
clang::Declarator::getIdentifierLoc
SourceLocation getIdentifierLoc() const
Definition: DeclSpec.h:2178
clang::ASTContext::getCanonicalType
CanQualType getCanonicalType(QualType T) const
Return the canonical (structural) type corresponding to the specified potentially non-canonical type ...
Definition: ASTContext.h:2305
clang::Sema::TrivialABIHandling
TrivialABIHandling
Definition: Sema.h:2598
GetKeyForMember
static const void * GetKeyForMember(ASTContext &Context, CXXCtorInitializer *Member)
Definition: SemaDeclCXX.cpp:5162
clang::CXXDefaultInitExpr
A use of a default initializer in a constructor or in aggregate initialization.
Definition: ExprCXX.h:1279
clang::Sema::getStdAlignValT
EnumDecl * getStdAlignValT() const
Definition: SemaDeclCXX.cpp:10631
clang::CXXScopeSpec::isSet
bool isSet() const
Deprecated.
Definition: DeclSpec.h:209
clang::Type::isLValueReferenceType
bool isLValueReferenceType() const
Definition: Type.h:6520
clang::CXXRecordDecl::needsImplicitCopyConstructor
bool needsImplicitCopyConstructor() const
Determine whether this class needs an implicit copy constructor to be lazily declared.
Definition: DeclCXX.h:766
clang::TypeSourceInfo::getTypeLoc
TypeLoc getTypeLoc() const
Return the TypeLoc wrapper for the type source info.
Definition: TypeLoc.h:244
clang::CXXRecordDecl::getDescribedClassTemplate
ClassTemplateDecl * getDescribedClassTemplate() const
Retrieves the class template that is described by this class declaration.
Definition: DeclCXX.cpp:1692
clang::Declarator::setInvalidType
void setInvalidType(bool Val=true)
Definition: DeclSpec.h:2529
clang::Qualifiers::OCL_Weak
Reading or writing from this object requires a barrier call.
Definition: Type.h:174
IIK_Copy
Definition: SemaDeclCXX.cpp:4527
clang::FunctionProtoType::ExceptionSpecInfo::NoexceptExpr
Expr * NoexceptExpr
Noexcept expression, if this is a computed noexcept specification.
Definition: Type.h:3819
clang::Sema::ActOnParamDefaultArgumentError
void ActOnParamDefaultArgumentError(Decl *param, SourceLocation EqualLoc)
ActOnParamDefaultArgumentError - Parsing or semantic analysis of the default argument for the paramet...
Definition: SemaDeclCXX.cpp:357
clang::Sema::DefineImplicitLambdaToBlockPointerConversion
void DefineImplicitLambdaToBlockPointerConversion(SourceLocation CurrentLoc, CXXConversionDecl *Conv)
Define the "body" of the conversion from a lambda object to a block pointer.
Definition: SemaDeclCXX.cpp:14492
clang::TemplateArgument::getKind
ArgKind getKind() const
Return the kind of stored template argument.
Definition: TemplateBase.h:234
clang::TemplateTypeParmType::getDepth
unsigned getDepth() const
Definition: Type.h:4690
BuildBasePathArray
static void BuildBasePathArray(const CXXBasePath &Path, CXXCastPath &BasePathArray)
Definition: SemaDeclCXX.cpp:2790
clang::FunctionProtoType::getParamType
QualType getParamType(unsigned i) const
Definition: Type.h:3966
clang::Sema::MaybeCreateExprWithCleanups
Expr * MaybeCreateExprWithCleanups(Expr *SubExpr)
MaybeCreateExprWithCleanups - If the current full-expression requires any cleanups, surround it with a ExprWithCleanups node.
Definition: SemaExprCXX.cpp:6767
clang::Stmt::printPretty
void printPretty(raw_ostream &OS, PrinterHelper *Helper, const PrintingPolicy &Policy, unsigned Indentation=0, StringRef NewlineSymbol="\, const ASTContext *Context=nullptr) const
Definition: StmtPrinter.cpp:2518
clang::ASTContext::getTranslationUnitDecl
TranslationUnitDecl * getTranslationUnitDecl() const
Definition: ASTContext.h:1009
clang::Sema::MarkBaseAndMemberDestructorsReferenced
void MarkBaseAndMemberDestructorsReferenced(SourceLocation Loc, CXXRecordDecl *Record)
MarkBaseAndMemberDestructorsReferenced - Given a record decl, mark all the non-trivial destructors of...
Definition: SemaDeclCXX.cpp:5395
clang::ASTContext::Deallocate
void Deallocate(void *Ptr) const
Definition: ASTContext.h:692
clang::MemberExpr
MemberExpr - [C99 6.5.2.3] Structure and Union Members.
Definition: Expr.h:2836
functionDeclHasDefaultArgument
static bool functionDeclHasDefaultArgument(const FunctionDecl *FD)
Definition: SemaDeclCXX.cpp:421
clang::Sema::CheckOverrideControl
void CheckOverrideControl(NamedDecl *D)
CheckOverrideControl - Check C++11 override control semantics.
Definition: SemaDeclCXX.cpp:2968
clang::FunctionType::getCallConv
CallingConv getCallConv() const
Definition: Type.h:3690
clang::ThreadStorageClassSpecifier
ThreadStorageClassSpecifier
Thread storage-class-specifier.
Definition: Specifiers.h:222
clang::CXXRecordDecl::setImplicitMoveAssignmentIsDeleted
void setImplicitMoveAssignmentIsDeleted()
Set that we attempted to declare an implicit move assignment operator, but overload resolution failed...
Definition: DeclCXX.h:915
clang::InitializationSequence
Describes the sequence of initializations required to initialize a given object or reference with a s...
Definition: Initialization.h:760
clang::NestedNameSpecifierLocBuilder::getWithLocInContext
NestedNameSpecifierLoc getWithLocInContext(ASTContext &Context) const
Retrieve a nested-name-specifier with location information, copied into the given AST context...
Definition: NestedNameSpecifier.cpp:700
clang::UnresolvedSetImpl::pairs
ArrayRef< DeclAccessPair > pairs() const
Definition: UnresolvedSet.h:89
clang::DeclSpec
Captures information about "declaration specifiers".
Definition: DeclSpec.h:228
clang::ExprResult
ActionResult< Expr * > ExprResult
Definition: Ownership.h:263
clang::QualType::getUnqualifiedType
QualType getUnqualifiedType() const
Retrieve the unqualified variant of the given type, removing as little sugar as possible.
Definition: Type.h:6336
clang::DeclSpec::getRestrictSpecLoc
SourceLocation getRestrictSpecLoc() const
Definition: DeclSpec.h:552
clang::ParmVarDecl::setDefaultArg
void setDefaultArg(Expr *defarg)
Definition: Decl.cpp:2722
clang::FieldDecl::isMutable
bool isMutable() const
Determines whether this field is mutable (C++ only).
Definition: Decl.h:2804
clang::SourceRange::setEnd
void setEnd(SourceLocation e)
Definition: SourceLocation.h:220
clang::ASTContext::getCurrentKeyFunction
const CXXMethodDecl * getCurrentKeyFunction(const CXXRecordDecl *RD)
Get our current best idea for the key function of the given record decl, or nullptr if there isn&#39;t on...
Definition: RecordLayoutBuilder.cpp:3112
clang::CXXRecordDecl
Represents a C++ struct/union/class.
Definition: DeclCXX.h:253
CheckConstexprParameterTypes
static bool CheckConstexprParameterTypes(Sema &SemaRef, const FunctionDecl *FD, Sema::CheckConstexprKind Kind)
Check whether a function&#39;s parameter types are all literal types.
Definition: SemaDeclCXX.cpp:1632
clang::BinaryOperator::isCompoundAssignmentOp
static bool isCompoundAssignmentOp(Opcode Opc)
Definition: Expr.h:3565
clang::ObjCImplementationDecl::setIvarInitializers
void setIvarInitializers(ASTContext &C, CXXCtorInitializer **initializers, unsigned numInitializers)
Definition: DeclObjC.cpp:2195
clang::SourceRange::isValid
bool isValid() const
Definition: SourceLocation.h:222
clang::CXXRecordDecl::hasUserDeclaredMoveConstructor
bool hasUserDeclaredMoveConstructor() const
Determine whether this class has had a move constructor declared by the user.
Definition: DeclCXX.h:813
clang::Sema::CompleteConstructorCall
bool CompleteConstructorCall(CXXConstructorDecl *Constructor, MultiExprArg ArgsPtr, SourceLocation Loc, SmallVectorImpl< Expr *> &ConvertedArgs, bool AllowExplicit=false, bool IsListInitialization=false)
Given a constructor and the set of arguments provided for the constructor, convert the arguments and ...
Definition: SemaDeclCXX.cpp:14783
clang::Sema::ActOnPureSpecifier
void ActOnPureSpecifier(Decl *D, SourceLocation PureSpecLoc)
Definition: SemaDeclCXX.cpp:16631
clang::Sema::SetCtorInitializers
bool SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors, ArrayRef< CXXCtorInitializer *> Initializers=None)
Definition: SemaDeclCXX.cpp:4970
clang::ASTContext::getRValueReferenceType
QualType getRValueReferenceType(QualType T) const
Return the uniqued reference to the type for an rvalue reference to the specified type...
Definition: ASTContext.cpp:3261
IIK_Inherit
Definition: SemaDeclCXX.cpp:4529
clang::Type::isVoidType
bool isVoidType() const
Definition: Type.h:6777
clang::ExplicitSpecKind::Unresolved
clang::Sema::AttachBaseSpecifiers
bool AttachBaseSpecifiers(CXXRecordDecl *Class, MutableArrayRef< CXXBaseSpecifier *> Bases)
Performs the actual work of attaching the given base class specifiers to a C++ class.
Definition: SemaDeclCXX.cpp:2627
clang::Sema::AbstractVariableType
Definition: Sema.h:6797
clang::BinaryConditionalOperator
BinaryConditionalOperator - The GNU extension to the conditional operator which allows the middle ope...
Definition: Expr.h:3808
clang::CXXCatchStmt
CXXCatchStmt - This represents a C++ catch block.
Definition: StmtCXX.h:28
clang::interp::LE
bool LE(InterpState &S, CodePtr OpPC)
Definition: Interp.h:237
RecordLayout.h
clang::Sema::DiagnoseReturnInConstructorExceptionHandler
void DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock)
Definition: SemaDeclCXX.cpp:16449
clang::SourceLocation::isInvalid
bool isInvalid() const
Definition: SourceLocation.h:107
clang::QualType::getQualifiers
Qualifiers getQualifiers() const
Retrieve the set of qualifiers applied to this type.
Definition: Type.h:6283
clang::Sema::ActOnParamUnparsedDefaultArgument
void ActOnParamUnparsedDefaultArgument(Decl *param, SourceLocation EqualLoc, SourceLocation ArgLoc)
ActOnParamUnparsedDefaultArgument - We&#39;ve seen a default argument for a function parameter, but we can&#39;t parse it yet because we&#39;re inside a class definition.
Definition: SemaDeclCXX.cpp:344
isTupleLike
static IsTupleLike isTupleLike(Sema &S, SourceLocation Loc, QualType T, llvm::APSInt &Size)
Definition: SemaDeclCXX.cpp:1029
clang::Sema::popCodeSynthesisContext
void popCodeSynthesisContext()
Definition: SemaTemplateInstantiate.cpp:439
clang::FunctionTypeLoc::setParam
void setParam(unsigned i, ParmVarDecl *VD)
Definition: TypeLoc.h:1433
clang::CXXScopeSpec::isNotEmpty
bool isNotEmpty() const
A scope specifier is present, but may be valid or invalid.
Definition: DeclSpec.h:191
clang::ASTContext::Char16Ty
CanQualType Char16Ty
Definition: ASTContext.h:1023
clang::ASTContext::removeAddrSpaceQualType
QualType removeAddrSpaceQualType(QualType T) const
Remove any existing address space on the type and returns the type with qualifiers intact (or that&#39;s ...
Definition: ASTContext.cpp:2888
clang::AttrSyntax::C
clang::Attr::isInherited
bool isInherited() const
Definition: Attr.h:94
hasOneRealArgument
static bool hasOneRealArgument(MultiExprArg Args)
Determine whether the given list arguments contains exactly one "real" (non-default) argument...
Definition: SemaDeclCXX.cpp:14546
clang::Sema::CheckBaseClassAccess
AccessResult CheckBaseClassAccess(SourceLocation AccessLoc, QualType Base, QualType Derived, const CXXBasePath &Path, unsigned DiagID, bool ForceCheck=false, bool ForceUnprivileged=false)
Checks access for a hierarchy conversion.
Definition: SemaAccess.cpp:1826
clang::Declarator::getDeclSpec
const DeclSpec & getDeclSpec() const
getDeclSpec - Return the declaration-specifier that this declarator was declared with.
Definition: DeclSpec.h:1895
clang::Sema::CurContext
DeclContext * CurContext
CurContext - This is the current declaration context of parsing.
Definition: Sema.h:397
clang::DeclSpec::TQ_volatile
Definition: DeclSpec.h:317
clang::FriendDecl::setUnsupportedFriend
void setUnsupportedFriend(bool Unsupported)
Definition: DeclFriend.h:177
clang::UsingDecl::Create
static UsingDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation UsingL, NestedNameSpecifierLoc QualifierLoc, const DeclarationNameInfo &NameInfo, bool HasTypenameKeyword)
Definition: DeclCXX.cpp:2935
clang::Expr::isRValue
bool isRValue() const
Definition: Expr.h:259
clang::ClassTemplateDecl
Declaration of a class template.
Definition: DeclTemplate.h:2238
clang::ASTContext::getPointerType
QualType getPointerType(QualType T) const
Return the uniqued reference to the type for a pointer to the specified type.
Definition: ASTContext.cpp:3102
clang::DeclaratorChunk::Reference
Definition: DeclSpec.h:1176
clang::DeclSpec::isVirtualSpecified
bool isVirtualSpecified() const
Definition: DeclSpec.h:581
clang::FixItHint::CreateReplacement
static FixItHint CreateReplacement(CharSourceRange RemoveRange, StringRef Code)
Create a code modification hint that replaces the given source range with the given code string...
Definition: Diagnostic.h:129
clang::Declarator::setInventedTemplateParameterList
void setInventedTemplateParameterList(TemplateParameterList *Invented)
Sets the template parameter list generated from the explicit template parameters along with any inven...
Definition: DeclSpec.h:2469
clang::Decl::addAttr
void addAttr(Attr *A)
Definition: DeclBase.cpp:832
clang::CXXRecordDecl::lambdaIsDefaultConstructibleAndAssignable
bool lambdaIsDefaultConstructibleAndAssignable() const
Determine whether this lambda should have an implicit default constructor and copy and move assignmen...
Definition: DeclCXX.cpp:653
clang::LookupResult::getAcceptableDecl
NamedDecl * getAcceptableDecl(NamedDecl *D) const
Retrieve the accepted (re)declaration of the given declaration, if there is one.
Definition: Lookup.h:361
clang::Sema::CheckExplicitlyDefaultedFunction
void CheckExplicitlyDefaultedFunction(Scope *S, FunctionDecl *MD)
Definition: SemaDeclCXX.cpp:6915
clang::Sema::getSourceManager
SourceManager & getSourceManager() const
Definition: Sema.h:1329
clang::ParmVarDecl::getDefaultArgRange
SourceRange getDefaultArgRange() const
Retrieve the source range that covers the entire default argument.
Definition: Decl.cpp:2727
clang::LookupResult::end
iterator end() const
Definition: Lookup.h:336
clang::UnqualifiedIdKind::IK_TemplateId
A template-id, e.g., f<int>.
clang::Sema::CheckOverridingFunctionReturnType
bool CheckOverridingFunctionReturnType(const CXXMethodDecl *New, const CXXMethodDecl *Old)
CheckOverridingFunctionReturnType - Checks whether the return types are covariant, according to C++ [class.virtual]p5.
Definition: SemaDeclCXX.cpp:16504
clang::DeclContextLookupResult::begin
iterator begin() const
Definition: DeclBase.h:1236
clang::CXXRecordDecl::hasInheritedAssignment
bool hasInheritedAssignment() const
Determine whether this class has a using-declaration that names a base class assignment operator...
Definition: DeclCXX.h:1323
clang::Stmt::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:263
clang::Diagnostic
A little helper class (which is basically a smart pointer that forwards info from DiagnosticsEngine) ...
Definition: Diagnostic.h:1327
clang::StringLiteral
StringLiteral - This represents a string literal expression, e.g.
Definition: Expr.h:1711
TargetInfo.h
Defines the clang::TargetInfo interface.
clang::CallExpr
CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
Definition: Expr.h:2546
clang::CXXBasePath::Access
AccessSpecifier Access
The access along this inheritance path.
Definition: CXXInheritance.h:75
clang::TargetCXXABI::isMicrosoft
bool isMicrosoft() const
Is this ABI an MSVC-compatible ABI?
Definition: TargetCXXABI.h:160
clang::DeclSpec::isInlineSpecified
bool isInlineSpecified() const
Definition: DeclSpec.h:570
defaultedSpecialMemberIsConstexpr
static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, Sema::CXXSpecialMember CSM, bool ConstArg, CXXConstructorDecl *InheritedCtor=nullptr, Sema::InheritedConstructorInfo *Inherited=nullptr)
Determine whether the specified special member function would be constexpr if it were implicitly defi...
Definition: SemaDeclCXX.cpp:6731
clang::FunctionDecl::getSourceRange
SourceRange getSourceRange() const override LLVM_READONLY
Source range that this declaration covers.
Definition: Decl.cpp:3868
clang::FunctionDecl::doesThisDeclarationHaveABody
bool doesThisDeclarationHaveABody() const
Returns whether this specific declaration of the function has a body.
Definition: Decl.h:2078
clang::Decl::Kind
Kind
Lists the kind of concrete classes of Decl.
Definition: DeclBase.h:91
clang::DeclSpec::getAtomicSpecLoc
SourceLocation getAtomicSpecLoc() const
Definition: DeclSpec.h:554
clang::ExprError
ExprResult ExprError()
Definition: Ownership.h:279
clang::Qualifiers::hasVolatile
bool hasVolatile() const
Definition: Type.h:265
clang::UnqualifiedIdKind::IK_ConstructorName
A constructor name.
clang::ASTContext::adjustExceptionSpec
void adjustExceptionSpec(FunctionDecl *FD, const FunctionProtoType::ExceptionSpecInfo &ESI, bool AsWritten=false)
Change the exception specification on a function once it is delay-parsed, instantiated, or computed.
Definition: ASTContext.cpp:3044
clang::Sema::AbstractParamType
Definition: Sema.h:6796
clang::Sema::CheckFriendTypeDecl
FriendDecl * CheckFriendTypeDecl(SourceLocation LocStart, SourceLocation FriendLoc, TypeSourceInfo *TSInfo)
Perform semantic analysis of the given friend type declaration.
Definition: SemaDeclCXX.cpp:15671
clang::LambdaExpr::capture_begin
capture_iterator capture_begin() const
Retrieve an iterator pointing to the first lambda capture.
Definition: ExprCXX.cpp:1245
CheckAbstractClassUsage
static void CheckAbstractClassUsage(AbstractUsageInfo &Info, CXXMethodDecl *MD)
Check for invalid uses of an abstract type in a method declaration.
Definition: SemaDeclCXX.cpp:5730
clang::UsingDecl::getQualifier
NestedNameSpecifier * getQualifier() const
Retrieve the nested-name-specifier that qualifies the name.
Definition: DeclCXX.h:3412
clang::TemplateName::getKind
NameKind getKind() const
Definition: TemplateName.cpp:80
clang::ASTContext::IntTy
CanQualType IntTy
Definition: ASTContext.h:1025
clang::VectorType::getNumElements
unsigned getNumElements() const
Definition: Type.h:3271
clang::Redeclarable::getMostRecentDecl
decl_type * getMostRecentDecl()
Returns the most recent (re)declaration of this declaration.
Definition: Redeclarable.h:225
clang::TranslationUnitDecl
The top declaration context.
Definition: Decl.h:82
clang::EST_NoThrow
Microsoft __declspec(nothrow) extension.
Definition: ExceptionSpecificationType.h:25
clang::Type::isDependentType
bool isDependentType() const
Whether this type is a dependent type, meaning that its definition somehow depends on a template para...
Definition: Type.h:2150
clang::DeclSpec::getConstexprSpecLoc
SourceLocation getConstexprSpecLoc() const
Definition: DeclSpec.h:750
clang::TemplateArgument::getAsType
QualType getAsType() const
Retrieve the type for a type template argument.
Definition: TemplateBase.h:256
clang::DeclRefExpr
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:1171
clang::Sema::CheckConversionDeclarator
void CheckConversionDeclarator(Declarator &D, QualType &R, StorageClass &SC)
CheckConversionDeclarator - Called by ActOnDeclarator to check the well-formednes of the conversion f...
Definition: SemaDeclCXX.cpp:10060
clang::Scope::getFnParent
const Scope * getFnParent() const
getFnParent - Return the closest scope that is a function body.
Definition: Scope.h:232
clang::DeclaratorChunk::FunctionTypeInfo::hasRefQualifier
bool hasRefQualifier() const
Determine whether this function declaration contains a ref-qualifier.
Definition: DeclSpec.h:1471
clang::DiagnosticsEngine::isIgnored
bool isIgnored(unsigned DiagID, SourceLocation Loc) const
Determine whether the diagnostic is known to be ignored.
Definition: Diagnostic.h:825
clang::TagDecl::isUnion
bool isUnion() const
Definition: Decl.h:3407
clang::TemplateSpecializationType
Represents a type template specialization; the template must be a class template, a type alias templa...
Definition: Type.h:4996
clang::NamedDecl::getMostRecentDecl
NamedDecl * getMostRecentDecl()
Definition: Decl.h:428
clang::BinaryOperator::getRHS
Expr * getRHS() const
Definition: Expr.h:3476
clang::LangOptions::MSVC2015
Definition: LangOptions.h:116
clang::Sema::DiagnoseHiddenVirtualMethods
void DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD)
Diagnose methods which overload virtual methods in a base class without overriding any...
Definition: SemaDeclCXX.cpp:9408
clang::Sema::DeclareImplicitCopyAssignment
CXXMethodDecl * DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl)
Declare the implicit copy assignment operator for the given class.
Definition: SemaDeclCXX.cpp:13464
clang::FunctionDecl::isDeleted
bool isDeleted() const
Whether this function has been deleted.
Definition: Decl.h:2259
clang::Type::isPointerType
bool isPointerType() const
Definition: Type.h:6504
clang::Sema::SpecialMemberOverloadResult::NoMemberOrDeleted
Definition: Sema.h:1134
clang::Sema::BuildCXXDefaultInitExpr
ExprResult BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field)
Definition: SemaDeclCXX.cpp:14654
clang::FunctionDecl::getTemplatedKind
TemplatedKind getTemplatedKind() const
What kind of templated function this is.
Definition: Decl.cpp:3517
clang::TypedefType
Definition: Type.h:4240
clang::CXXRecordDecl::implicitCopyConstructorHasConstParam
bool implicitCopyConstructorHasConstParam() const
Determine whether an implicit copy constructor for this type would have a parameter with a const-qual...
Definition: DeclCXX.h:787
clang::CXXBasePaths
BasePaths - Represents the set of paths from a derived class to one of its (direct or indirect) bases...
Definition: CXXInheritance.h:118
clang::ASTConsumer::HandleTopLevelDecl
virtual bool HandleTopLevelDecl(DeclGroupRef D)
HandleTopLevelDecl - Handle the specified top-level declaration.
Definition: ASTConsumer.cpp:18
clang::Qualifiers::addAddressSpace
void addAddressSpace(LangAS space)
Definition: Type.h:385
clang::LookupResult::setBaseObjectType
void setBaseObjectType(QualType T)
Sets the base object type for this lookup.
Definition: Lookup.h:420
clang::ASTContext::getTypeSizeInChars
CharUnits getTypeSizeInChars(QualType T) const
Return the size of the specified (complete) type T, in characters.
Definition: ASTContext.cpp:2383
clang::FixItHint
Annotates a diagnostic with some code that should be inserted, removed, or replaced to fix the proble...
Definition: Diagnostic.h:66
clang::CXXRecordDecl::needsImplicitMoveConstructor
bool needsImplicitMoveConstructor() const
Determine whether this class should get an implicit move constructor or if any existing special membe...
Definition: DeclCXX.h:852
clang::OR_No_Viable_Function
No viable function found.
Definition: Overload.h:56
clang::DecompositionDeclarator::bindings
ArrayRef< Binding > bindings() const
Definition: DeclSpec.h:1727
clang::CPlusPlus14
Definition: LangStandard.h:49
clang::Sema::CheckDestructor
bool CheckDestructor(CXXDestructorDecl *Destructor)
CheckDestructor - Checks a fully-formed destructor definition for well-formedness, issuing any diagnostics required.
Definition: SemaDeclCXX.cpp:9883
clang::Declarator::getContext
DeclaratorContext getContext() const
Definition: DeclSpec.h:1920
clang::VarDecl::isStaticDataMember
bool isStaticDataMember() const
Determines whether this is a static data member.
Definition: Decl.h:1144
clang::TagDecl::getInnerLocStart
SourceLocation getInnerLocStart() const
Return SourceLocation representing start of source range ignoring outer template declarations.
Definition: Decl.h:3305
clang::LookupResult::suppressDiagnostics
void suppressDiagnostics()
Suppress the diagnostics that would normally fire because of this lookup.
Definition: Lookup.h:583
clang::Sema::CXXMoveAssignment
Definition: Sema.h:1245
clang::NamespaceDecl::getAnonymousNamespace
NamespaceDecl * getAnonymousNamespace() const
Retrieve the anonymous namespace nested inside this namespace, if any.
Definition: Decl.h:580
clang::CXXRecordDecl::hasDirectFields
bool hasDirectFields() const
Determine whether this class has direct non-static data members.
Definition: DeclCXX.h:1110
clang::MSPropertyDecl
An instance of this class represents the declaration of a property member.
Definition: DeclCXX.h:3940
clang::ActionResult::getAs
T * getAs()
Definition: Ownership.h:171
clang::Sema::DefineDefaultedComparison
void DefineDefaultedComparison(SourceLocation Loc, FunctionDecl *FD, DefaultedComparisonKind DCK)
Definition: SemaDeclCXX.cpp:8170
clang::DeclarationName::getCXXLiteralIdentifier
IdentifierInfo * getCXXLiteralIdentifier() const
If this name is the name of a literal operator, retrieve the identifier associated with it...
Definition: DeclarationName.h:472
clang::ValueDecl::getType
QualType getType() const
Definition: Decl.h:630
clang::VK_LValue
An l-value expression is a reference to an object with independent storage.
Definition: Specifiers.h:129
clang::LookupResult::empty
bool empty() const
Return true if no decls were found.
Definition: Lookup.h:339
clang::CSK_constexpr
Definition: Specifiers.h:34
clang::ComparisonCategoryInfo::getType
QualType getType() const
Definition: ComparisonCategories.cpp:165
clang::Sema::CXXDefaultConstructor
Definition: Sema.h:1241
clang::DeclaratorChunk::Paren
Definition: DeclSpec.h:1176
clang::SourceRange
A trivial tuple used to represent a source range.
Definition: SourceLocation.h:207
clang::FunctionProtoType::ExtProtoInfo::Variadic
bool Variadic
Definition: Type.h:3839
clang::DeclContextLookupResult::iterator
Definition: DeclBase.h:1220
clang::Decl::setLexicalDeclContext
void setLexicalDeclContext(DeclContext *DC)
Definition: DeclBase.cpp:299
clang::Sema::Context
ASTContext & Context
Definition: Sema.h:385
clang::FunctionDecl::getCanonicalDecl
FunctionDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: Decl.cpp:3158
clang::CXXBasePaths::end
paths_iterator end()
Definition: CXXInheritance.h:192
clang::DeclarationName::CXXOperatorName
Definition: DeclarationName.h:209
clang::NamedDecl
This represents a decl that may have a name.
Definition: Decl.h:223
clang::Sema::TypeDiagnoser::diagnose
virtual void diagnose(Sema &S, SourceLocation Loc, QualType T)=0
clang::Decl::dropAttr
void dropAttr()
Definition: DeclBase.h:513
clang::DeclContext::isTranslationUnit
bool isTranslationUnit() const
Definition: DeclBase.h:1859
clang::DeclSpec::getRepAsExpr
Expr * getRepAsExpr() const
Definition: DeclSpec.h:497
clang::TemplateTypeParmType
Definition: Type.h:4647
clang::TypeLoc::castAs
T castAs() const
Convert to the specified TypeLoc type, asserting that this TypeLoc is of the desired type...
Definition: TypeLoc.h:77
clang::Decl::setAccess
void setAccess(AccessSpecifier AS)
Definition: DeclBase.h:468
clang::Sema::tryResolveExplicitSpecifier
bool tryResolveExplicitSpecifier(ExplicitSpecifier &ExplicitSpec)
tryResolveExplicitSpecifier - Attempt to resolve the explict specifier.
Definition: SemaDeclCXX.cpp:12431
clang::ASTContext::BoolTy
CanQualType BoolTy
Definition: ASTContext.h:1017
clang::NamespaceAliasDecl
Represents a C++ namespace alias.
Definition: DeclCXX.h:2967
clang::Sema::ActOnTemplatedFriendTag
Decl * ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, unsigned TagSpec, SourceLocation TagLoc, CXXScopeSpec &SS, IdentifierInfo *Name, SourceLocation NameLoc, const ParsedAttributesView &Attr, MultiTemplateParamsArg TempParamLists)
Handle a friend tag declaration where the scope specifier was templated.
Definition: SemaDeclCXX.cpp:15743
clang::ETK_None
No keyword precedes the qualified type name.
Definition: Type.h:5227
clang::CXXBaseSpecifier::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
Retrieves the source range that contains the entire base specifier.
Definition: DeclCXX.h:188
clang::Sema::MakeFullDiscardedValueExpr
FullExprArg MakeFullDiscardedValueExpr(Expr *Arg)
Definition: Sema.h:4095
clang::LookupResult::begin
iterator begin() const
Definition: Lookup.h:335
clang::UsingDirectiveDecl
Represents C++ using-directive.
Definition: DeclCXX.h:2863
clang::Sema::DiagnoseAbstractType
void DiagnoseAbstractType(const CXXRecordDecl *RD)
Definition: SemaDeclCXX.cpp:5561
CastForMoving
static Expr * CastForMoving(Sema &SemaRef, Expr *E, QualType T=QualType())
Definition: SemaDeclCXX.cpp:4510
clang::CXXRecordDecl::isAggregate
bool isAggregate() const
Determine whether this class is an aggregate (C++ [dcl.init.aggr]), which is a class with no user-dec...
Definition: DeclCXX.h:1056
clang::InitializedEntity
Describes an entity that is being initialized.
Definition: Initialization.h:48
ComparisonCategories.h
clang::ClassTemplateSpecializationDecl::getPointOfInstantiation
SourceLocation getPointOfInstantiation() const
Get the point of instantiation (if any), or null if none.
Definition: DeclTemplate.h:1931
clang::Attr::getKind
attr::Kind getKind() const
Definition: Attr.h:85
clang::Sema::ActOnMemInitializer
MemInitResult ActOnMemInitializer(Decl *ConstructorD, Scope *S, CXXScopeSpec &SS, IdentifierInfo *MemberOrBase, ParsedType TemplateTypeTy, const DeclSpec &DS, SourceLocation IdLoc, SourceLocation LParenLoc, ArrayRef< Expr *> Args, SourceLocation RParenLoc, SourceLocation EllipsisLoc)
Handle a C++ member initializer using parentheses syntax.
Definition: SemaDeclCXX.cpp:4011
clang::LookupResult::getRepresentativeDecl
NamedDecl * getRepresentativeDecl() const
Fetches a representative decl. Useful for lazy diagnostics.
Definition: Lookup.h:524
clang::ComparisonCategoryType
ComparisonCategoryType
An enumeration representing the different comparison categories types.
Definition: ComparisonCategories.h:43
clang::DeclContextLookupResult::empty
bool empty() const
Definition: DeclBase.h:1239
clang::NestedNameSpecifier::Global
The global specifier &#39;::&#39;. There is no stored value.
Definition: NestedNameSpecifier.h:95
clang::ASTContext::getCanonicalNestedNameSpecifier
NestedNameSpecifier * getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) const
Retrieves the "canonical" nested name specifier for a given nested name specifier.
Definition: ASTContext.cpp:5656
clang::Sema::ActOnDecompositionDeclarator
NamedDecl * ActOnDecompositionDeclarator(Scope *S, Declarator &D, MultiTemplateParamsArg TemplateParamLists)
Definition: SemaDeclCXX.cpp:687
TSK_CompleteObject
The object is actually the complete object.
Definition: SemaDeclCXX.cpp:9032
clang::FunctionDecl::getFunctionTypeLoc
FunctionTypeLoc getFunctionTypeLoc() const
Find the source location information for how the type of this function was written.
Definition: Decl.cpp:3389
clang::FunctionDecl::getNumParams
unsigned getNumParams() const
Return the number of parameters this function must have based on its FunctionType.
Definition: Decl.cpp:3242
clang::ValueDecl::setType
void setType(QualType newType)
Definition: Decl.h:631
clang::CXXRecordDecl::ctors
ctor_range ctors() const
Definition: DeclCXX.h:649
clang::Sema::ActOnAliasDeclaration
Decl * ActOnAliasDeclaration(Scope *CurScope, AccessSpecifier AS, MultiTemplateParamsArg TemplateParams, SourceLocation UsingLoc, UnqualifiedId &Name, const ParsedAttributesView &AttrList, TypeResult Type, Decl *DeclFromDeclSpec)
Definition: SemaDeclCXX.cpp:12123
clang::VarDecl::hasInit
bool hasInit() const
Definition: Decl.cpp:2226
clang::PointerTypeLoc
Wrapper for source info for pointers.
Definition: TypeLoc.h:1226
clang::SourceRange::getBegin
SourceLocation getBegin() const
Definition: SourceLocation.h:216
clang::ParsedAttributes
ParsedAttributes - A collection of parsed attributes.
Definition: ParsedAttr.h:824
clang::Sema::ActOnIfStmt
StmtResult ActOnIfStmt(SourceLocation IfLoc, bool IsConstexpr, Stmt *InitStmt, ConditionResult Cond, Stmt *ThenVal, SourceLocation ElseLoc, Stmt *ElseVal)
Definition: SemaStmt.cpp:563
ColonLoc
SourceLocation ColonLoc
Location of &#39;:&#39;.
Definition: OpenMPClause.h:107
clang::TemplateParameterList::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
Definition: DeclTemplate.h:199
clang::ASTContext::getLangOpts
const LangOptions & getLangOpts() const
Definition: ASTContext.h:724
clang::TypoCorrection::WillReplaceSpecifier
void WillReplaceSpecifier(bool ForceReplacement)
Definition: TypoCorrection.h:100
clang::BlockPointerTypeLoc
Wrapper for source info for block pointers.
Definition: TypeLoc.h:1239
clang::FunctionDecl::setDeletedAsWritten
void setDeletedAsWritten(bool D=true)
Definition: Decl.h:2267
clang::Sema::AddImplicitlyDeclaredMembersToClass
void AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl)
AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared special functions, such as the default constructor, copy constructor, or destructor, to the given C++ class (C++ [special]p1).
Definition: SemaDeclCXX.cpp:9535
clang::commonComparisonType
ComparisonCategoryType commonComparisonType(ComparisonCategoryType A, ComparisonCategoryType B)
Determine the common comparison type, as defined in C++2a [class.spaceship]p4.
Definition: ComparisonCategories.h:53
clang::UnqualifiedIdKind::IK_ImplicitSelfParam
An implicit &#39;self&#39; parameter.
clang::InheritableAttr
Definition: Attr.h:139
clang::Sema::SetIvarInitializers
void SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation)
SetIvarInitializers - This routine builds initialization ASTs for the Objective-C implementation whos...
Definition: SemaDeclCXX.cpp:16937
clang::ICIS_NoInit
No in-class initializer.
Definition: Specifiers.h:259
clang::CXXRecordDecl::vbases
base_class_range vbases()
Definition: DeclCXX.h:604
clang::ConstantArrayType
Represents the canonical version of C arrays with a specified constant size.
Definition: Type.h:2935
clang::FunctionProtoType::ExtProtoInfo::ExceptionSpec
ExceptionSpecInfo ExceptionSpec
Definition: Type.h:3843
clang::DeclaratorChunk::BlockPointer
Definition: DeclSpec.h:1176
clang::InitializedEntity::InitializeBinding
static InitializedEntity InitializeBinding(VarDecl *Binding)
Create the initialization entity for a structured binding.
Definition: Initialization.h:384
clang::UnqualifiedIdKind::IK_DeductionGuideName
A deduction-guide name (a template-name)
clang::FunctionTemplateDecl
Declaration of a template function.
Definition: DeclTemplate.h:977
clang::Sema::ActOnUsingDeclaration
Decl * ActOnUsingDeclaration(Scope *CurScope, AccessSpecifier AS, SourceLocation UsingLoc, SourceLocation TypenameLoc, CXXScopeSpec &SS, UnqualifiedId &Name, SourceLocation EllipsisLoc, const ParsedAttributesView &AttrList)
Definition: SemaDeclCXX.cpp:11089
clang::ImplicitValueInitExpr
Represents an implicitly-generated value initialization of an object of a given type.
Definition: Expr.h:5117
clang::Sema::SetDelegatingInitializer
bool SetDelegatingInitializer(CXXConstructorDecl *Constructor, CXXCtorInitializer *Initializer)
Definition: SemaDeclCXX.cpp:4949
clang::Sema::DiagnoseAbsenceOfOverrideControl
void DiagnoseAbsenceOfOverrideControl(NamedDecl *D)
DiagnoseAbsenceOfOverrideControl - Diagnose if &#39;override&#39; keyword was not used in the declaration of ...
Definition: SemaDeclCXX.cpp:3036
clang::Sema::ConditionResult
Definition: Sema.h:10992
clang::DeclaratorChunk::FunctionTypeInfo::Params
ParamInfo * Params
Params - This is a pointer to a new[]&#39;d array of ParamInfo objects that describe the parameters speci...
Definition: DeclSpec.h:1339
clang::ElaboratedTypeLoc::setElaboratedKeywordLoc
void setElaboratedKeywordLoc(SourceLocation Loc)
Definition: TypeLoc.h:2096
Comparison
Comparison
Definition: SemaOverload.cpp:9288
clang::Sema::UnusedPrivateFields
NamedDeclSetType UnusedPrivateFields
Set containing all declared private fields that are not used.
Definition: Sema.h:645
checkLiteralOperatorTemplateParameterList
static bool checkLiteralOperatorTemplateParameterList(Sema &SemaRef, FunctionTemplateDecl *TpDecl)
Definition: SemaDeclCXX.cpp:15122
getMSPropertyAttr
static const ParsedAttr * getMSPropertyAttr(const ParsedAttributesView &list)
Definition: SemaDeclCXX.cpp:3087
clang::Attr
Attr - This represents one attribute.
Definition: Attr.h:45
clang::DeclSpec::getAttributes
ParsedAttributes & getAttributes()
Definition: DeclSpec.h:787
clang::Decl::getLocation
SourceLocation getLocation() const
Definition: DeclBase.h:429
clang::UsingShadowDecl
Represents a shadow declaration introduced into a scope by a (resolved) using declaration.
Definition: DeclCXX.h:3162
clang::NamedDecl::isExternallyVisible
bool isExternallyVisible() const
Definition: Decl.h:362
Std
LangStandard::Kind Std
Definition: InterpolatingCompilationDatabase.cpp:129
clang::TypeSourceInfo::getType
QualType getType() const
Return the type wrapped by this type source info.
Definition: Type.h:6238
clang::TemplateName::Template
A single template declaration.
Definition: TemplateName.h:204
clang::TagDecl::isBeingDefined
bool isBeingDefined() const
Return true if this decl is currently being defined.
Definition: Decl.h:3344
clang::InheritedConstructor::getShadowDecl
ConstructorUsingShadowDecl * getShadowDecl() const
Definition: DeclCXX.h:2369
clang::EST_NoexceptTrue
noexcept(expression), evals to &#39;true&#39;
Definition: ExceptionSpecificationType.h:29
clang::Sema::SemaDiagnosticBuilder
Helper class that creates diagnostics with optional template instantiation stacks.
Definition: Sema.h:1364
clang::Expr::IgnoreParens
Expr * IgnoreParens() LLVM_READONLY
Skip past any parentheses which might surround this expression until reaching a fixed point...
Definition: Expr.cpp:2986
clang::Sema::ActOnConversionDeclarator
Decl * ActOnConversionDeclarator(CXXConversionDecl *Conversion)
ActOnConversionDeclarator - Called by ActOnDeclarator to complete the declaration of the given C++ co...
Definition: SemaDeclCXX.cpp:10226
clang::DeclContext::decls_end
decl_iterator decls_end() const
Definition: DeclBase.h:2035
clang::Sema::TAH_IgnoreTrivialABI
The triviality of a method unaffected by "trivial_abi".
Definition: Sema.h:2600
clang::Create
static OMPLinearClause * Create(const ASTContext &C, SourceLocation StartLoc, SourceLocation LParenLoc, OpenMPLinearClauseKind Modifier, SourceLocation ModifierLoc, SourceLocation ColonLoc, SourceLocation EndLoc, ArrayRef< Expr *> VL, ArrayRef< Expr *> PL, ArrayRef< Expr *> IL, Expr *Step, Expr *CalcStep, Stmt *PreInit, Expr *PostUpdate)
Creates clause with a list of variables VL and a linear step Step.
clang::ASTContext::getSizeType
CanQualType getSizeType() const
Return the unique type for "size_t" (C99 7.17), defined in <stddef.h>.
Definition: ASTContext.cpp:5254
clang::QualType::getObjCLifetime
Qualifiers::ObjCLifetime getObjCLifetime() const
Returns lifetime attribute of this type.
Definition: Type.h:1080
clang::LookupResult::isVisible
static bool isVisible(Sema &SemaRef, NamedDecl *D)
Determine whether the given declaration is visible to the program.
Definition: Lookup.h:349
clang::Sema::ActOnFriendFunctionDecl
NamedDecl * ActOnFriendFunctionDecl(Scope *S, Declarator &D, MultiTemplateParamsArg TemplateParams)
Definition: SemaDeclCXX.cpp:15968
lookupOperatorsForDefaultedComparison
static void lookupOperatorsForDefaultedComparison(Sema &Self, Scope *S, UnresolvedSetImpl &Operators, OverloadedOperatorKind Op)
Perform the unqualified lookups that might be needed to form a defaulted comparison function for the ...
Definition: SemaDeclCXX.cpp:7921
clang::DeclContext::isTransparentContext
bool isTransparentContext() const
isTransparentContext - Determines whether this context is a "transparent" context, meaning that the members declared in this context are semantically declared in the nearest enclosing non-transparent (opaque) context but are lexically declared in this context.
Definition: DeclBase.cpp:1123
clang::Sema::ActOnReenterTemplateScope
unsigned ActOnReenterTemplateScope(Scope *S, Decl *Template)
Definition: SemaDeclCXX.cpp:9623
DiagnoseNamespaceInlineMismatch
static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, SourceLocation Loc, IdentifierInfo *II, bool *IsInline, NamespaceDecl *PrevNS)
Diagnose a mismatch in &#39;inline&#39; qualifiers when a namespace is reopened.
Definition: SemaDeclCXX.cpp:10421
clang::Sema::ContextRAII
A RAII object to temporarily push a declaration context.
Definition: Sema.h:797
clang::CXXRecordDecl::methods
method_range methods() const
Definition: DeclCXX.h:629
TSK_Field
The subobject is a non-static data member.
Definition: SemaDeclCXX.cpp:9030
clang::VarDecl::isNoDestroy
bool isNoDestroy(const ASTContext &) const
Is destruction of this variable entirely suppressed? If so, the variable need not have a usable destr...
Definition: Decl.cpp:2606
clang::CXXBaseSpecifier::getType
QualType getType() const
Retrieves the type of the base class.
Definition: DeclCXX.h:244
clang::ASTContext::CompCategories
ComparisonCategories CompCategories
Types and expressions required to build C++2a three-way comparisons using operator<=>, including the values return by builtin <=> operators.
Definition: ASTContext.h:2055
clang::CXXRecordDecl::defaultedDestructorIsDeleted
bool defaultedDestructorIsDeleted() const
true if a defaulted destructor for this class would be deleted.
Definition: DeclCXX.h:693