clang  10.0.0git
DeclBase.cpp
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1 //===- DeclBase.cpp - Declaration AST Node Implementation -----------------===//
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 the Decl and DeclContext classes.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "clang/AST/DeclBase.h"
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/ASTLambda.h"
17 #include "clang/AST/Attr.h"
18 #include "clang/AST/AttrIterator.h"
19 #include "clang/AST/Decl.h"
20 #include "clang/AST/DeclCXX.h"
22 #include "clang/AST/DeclFriend.h"
23 #include "clang/AST/DeclObjC.h"
24 #include "clang/AST/DeclOpenMP.h"
25 #include "clang/AST/DeclTemplate.h"
28 #include "clang/AST/Stmt.h"
29 #include "clang/AST/Type.h"
31 #include "clang/Basic/LLVM.h"
36 #include "clang/Basic/TargetInfo.h"
37 #include "llvm/ADT/ArrayRef.h"
38 #include "llvm/ADT/PointerIntPair.h"
39 #include "llvm/ADT/SmallVector.h"
40 #include "llvm/ADT/StringRef.h"
41 #include "llvm/Support/Casting.h"
42 #include "llvm/Support/ErrorHandling.h"
43 #include "llvm/Support/MathExtras.h"
44 #include "llvm/Support/VersionTuple.h"
45 #include "llvm/Support/raw_ostream.h"
46 #include <algorithm>
47 #include <cassert>
48 #include <cstddef>
49 #include <string>
50 #include <tuple>
51 #include <utility>
52 
53 using namespace clang;
54 
55 //===----------------------------------------------------------------------===//
56 // Statistics
57 //===----------------------------------------------------------------------===//
58 
59 #define DECL(DERIVED, BASE) static int n##DERIVED##s = 0;
60 #define ABSTRACT_DECL(DECL)
61 #include "clang/AST/DeclNodes.inc"
62 
65 }
66 
67 #define DECL(DERIVED, BASE) \
68  static_assert(alignof(Decl) >= alignof(DERIVED##Decl), \
69  "Alignment sufficient after objects prepended to " #DERIVED);
70 #define ABSTRACT_DECL(DECL)
71 #include "clang/AST/DeclNodes.inc"
72 
73 void *Decl::operator new(std::size_t Size, const ASTContext &Context,
74  unsigned ID, std::size_t Extra) {
75  // Allocate an extra 8 bytes worth of storage, which ensures that the
76  // resulting pointer will still be 8-byte aligned.
77  static_assert(sizeof(unsigned) * 2 >= alignof(Decl),
78  "Decl won't be misaligned");
79  void *Start = Context.Allocate(Size + Extra + 8);
80  void *Result = (char*)Start + 8;
81 
82  unsigned *PrefixPtr = (unsigned *)Result - 2;
83 
84  // Zero out the first 4 bytes; this is used to store the owning module ID.
85  PrefixPtr[0] = 0;
86 
87  // Store the global declaration ID in the second 4 bytes.
88  PrefixPtr[1] = ID;
89 
90  return Result;
91 }
92 
93 void *Decl::operator new(std::size_t Size, const ASTContext &Ctx,
94  DeclContext *Parent, std::size_t Extra) {
95  assert(!Parent || &Parent->getParentASTContext() == &Ctx);
96  // With local visibility enabled, we track the owning module even for local
97  // declarations. We create the TU decl early and may not yet know what the
98  // LangOpts are, so conservatively allocate the storage.
99  if (Ctx.getLangOpts().trackLocalOwningModule() || !Parent) {
100  // Ensure required alignment of the resulting object by adding extra
101  // padding at the start if required.
102  size_t ExtraAlign =
103  llvm::offsetToAlignment(sizeof(Module *), llvm::Align(alignof(Decl)));
104  auto *Buffer = reinterpret_cast<char *>(
105  ::operator new(ExtraAlign + sizeof(Module *) + Size + Extra, Ctx));
106  Buffer += ExtraAlign;
107  auto *ParentModule =
108  Parent ? cast<Decl>(Parent)->getOwningModule() : nullptr;
109  return new (Buffer) Module*(ParentModule) + 1;
110  }
111  return ::operator new(Size + Extra, Ctx);
112 }
113 
114 Module *Decl::getOwningModuleSlow() const {
115  assert(isFromASTFile() && "Not from AST file?");
117 }
118 
121 }
122 
123 const char *Decl::getDeclKindName() const {
124  switch (DeclKind) {
125  default: llvm_unreachable("Declaration not in DeclNodes.inc!");
126 #define DECL(DERIVED, BASE) case DERIVED: return #DERIVED;
127 #define ABSTRACT_DECL(DECL)
128 #include "clang/AST/DeclNodes.inc"
129  }
130 }
131 
132 void Decl::setInvalidDecl(bool Invalid) {
133  InvalidDecl = Invalid;
134  assert(!isa<TagDecl>(this) || !cast<TagDecl>(this)->isCompleteDefinition());
135  if (!Invalid) {
136  return;
137  }
138 
139  if (!isa<ParmVarDecl>(this)) {
140  // Defensive maneuver for ill-formed code: we're likely not to make it to
141  // a point where we set the access specifier, so default it to "public"
142  // to avoid triggering asserts elsewhere in the front end.
144  }
145 
146  // Marking a DecompositionDecl as invalid implies all the child BindingDecl's
147  // are invalid too.
148  if (auto *DD = dyn_cast<DecompositionDecl>(this)) {
149  for (auto *Binding : DD->bindings()) {
150  Binding->setInvalidDecl();
151  }
152  }
153 }
154 
155 const char *DeclContext::getDeclKindName() const {
156  switch (getDeclKind()) {
157 #define DECL(DERIVED, BASE) case Decl::DERIVED: return #DERIVED;
158 #define ABSTRACT_DECL(DECL)
159 #include "clang/AST/DeclNodes.inc"
160  }
161  llvm_unreachable("Declaration context not in DeclNodes.inc!");
162 }
163 
164 bool Decl::StatisticsEnabled = false;
166  StatisticsEnabled = true;
167 }
168 
170  llvm::errs() << "\n*** Decl Stats:\n";
171 
172  int totalDecls = 0;
173 #define DECL(DERIVED, BASE) totalDecls += n##DERIVED##s;
174 #define ABSTRACT_DECL(DECL)
175 #include "clang/AST/DeclNodes.inc"
176  llvm::errs() << " " << totalDecls << " decls total.\n";
177 
178  int totalBytes = 0;
179 #define DECL(DERIVED, BASE) \
180  if (n##DERIVED##s > 0) { \
181  totalBytes += (int)(n##DERIVED##s * sizeof(DERIVED##Decl)); \
182  llvm::errs() << " " << n##DERIVED##s << " " #DERIVED " decls, " \
183  << sizeof(DERIVED##Decl) << " each (" \
184  << n##DERIVED##s * sizeof(DERIVED##Decl) \
185  << " bytes)\n"; \
186  }
187 #define ABSTRACT_DECL(DECL)
188 #include "clang/AST/DeclNodes.inc"
189 
190  llvm::errs() << "Total bytes = " << totalBytes << "\n";
191 }
192 
193 void Decl::add(Kind k) {
194  switch (k) {
195 #define DECL(DERIVED, BASE) case DERIVED: ++n##DERIVED##s; break;
196 #define ABSTRACT_DECL(DECL)
197 #include "clang/AST/DeclNodes.inc"
198  }
199 }
200 
202  if (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(this))
203  return TTP->isParameterPack();
204  if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(this))
205  return NTTP->isParameterPack();
206  if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(this))
207  return TTP->isParameterPack();
208  return false;
209 }
210 
211 bool Decl::isParameterPack() const {
212  if (const auto *Var = dyn_cast<VarDecl>(this))
213  return Var->isParameterPack();
214 
215  return isTemplateParameterPack();
216 }
217 
219  if (auto *FD = dyn_cast<FunctionDecl>(this))
220  return FD;
221  if (const auto *FTD = dyn_cast<FunctionTemplateDecl>(this))
222  return FTD->getTemplatedDecl();
223  return nullptr;
224 }
225 
226 bool Decl::isTemplateDecl() const {
227  return isa<TemplateDecl>(this);
228 }
229 
231  if (auto *FD = dyn_cast<FunctionDecl>(this))
232  return FD->getDescribedFunctionTemplate();
233  else if (auto *RD = dyn_cast<CXXRecordDecl>(this))
234  return RD->getDescribedClassTemplate();
235  else if (auto *VD = dyn_cast<VarDecl>(this))
236  return VD->getDescribedVarTemplate();
237  else if (auto *AD = dyn_cast<TypeAliasDecl>(this))
238  return AD->getDescribedAliasTemplate();
239 
240  return nullptr;
241 }
242 
243 bool Decl::isTemplated() const {
244  // A declaration is dependent if it is a template or a template pattern, or
245  // is within (lexcially for a friend, semantically otherwise) a dependent
246  // context.
247  // FIXME: Should local extern declarations be treated like friends?
248  if (auto *AsDC = dyn_cast<DeclContext>(this))
249  return AsDC->isDependentContext();
251  return DC->isDependentContext() || isTemplateDecl() || getDescribedTemplate();
252 }
253 
255  for (const DeclContext *DC = getDeclContext();
256  DC && !DC->isTranslationUnit() && !DC->isNamespace();
257  DC = DC->getParent())
258  if (DC->isFunctionOrMethod())
259  return DC;
260 
261  return nullptr;
262 }
263 
264 //===----------------------------------------------------------------------===//
265 // PrettyStackTraceDecl Implementation
266 //===----------------------------------------------------------------------===//
267 
268 void PrettyStackTraceDecl::print(raw_ostream &OS) const {
269  SourceLocation TheLoc = Loc;
270  if (TheLoc.isInvalid() && TheDecl)
271  TheLoc = TheDecl->getLocation();
272 
273  if (TheLoc.isValid()) {
274  TheLoc.print(OS, SM);
275  OS << ": ";
276  }
277 
278  OS << Message;
279 
280  if (const auto *DN = dyn_cast_or_null<NamedDecl>(TheDecl)) {
281  OS << " '";
282  DN->printQualifiedName(OS);
283  OS << '\'';
284  }
285  OS << '\n';
286 }
287 
288 //===----------------------------------------------------------------------===//
289 // Decl Implementation
290 //===----------------------------------------------------------------------===//
291 
292 // Out-of-line virtual method providing a home for Decl.
293 Decl::~Decl() = default;
294 
296  DeclCtx = DC;
297 }
298 
300  if (DC == getLexicalDeclContext())
301  return;
302 
303  if (isInSemaDC()) {
304  setDeclContextsImpl(getDeclContext(), DC, getASTContext());
305  } else {
306  getMultipleDC()->LexicalDC = DC;
307  }
308 
309  // FIXME: We shouldn't be changing the lexical context of declarations
310  // imported from AST files.
311  if (!isFromASTFile()) {
312  setModuleOwnershipKind(getModuleOwnershipKindForChildOf(DC));
313  if (hasOwningModule())
314  setLocalOwningModule(cast<Decl>(DC)->getOwningModule());
315  }
316 
317  assert(
319  getOwningModule()) &&
320  "hidden declaration has no owning module");
321 }
322 
323 void Decl::setDeclContextsImpl(DeclContext *SemaDC, DeclContext *LexicalDC,
324  ASTContext &Ctx) {
325  if (SemaDC == LexicalDC) {
326  DeclCtx = SemaDC;
327  } else {
328  auto *MDC = new (Ctx) Decl::MultipleDC();
329  MDC->SemanticDC = SemaDC;
330  MDC->LexicalDC = LexicalDC;
331  DeclCtx = MDC;
332  }
333 }
334 
336  const DeclContext *LDC = getLexicalDeclContext();
337  while (true) {
338  if (LDC->isFunctionOrMethod())
339  return true;
340  if (!isa<TagDecl>(LDC))
341  return false;
342  LDC = LDC->getLexicalParent();
343  }
344  return false;
345 }
346 
348  for (const DeclContext *DC = getDeclContext(); DC; DC = DC->getParent()) {
349  if (const auto *ND = dyn_cast<NamespaceDecl>(DC))
350  if (ND->isAnonymousNamespace())
351  return true;
352  }
353 
354  return false;
355 }
356 
358  const DeclContext *DC = getDeclContext();
359  return DC && DC->isStdNamespace();
360 }
361 
363  if (auto *TUD = dyn_cast<TranslationUnitDecl>(this))
364  return TUD;
365 
366  DeclContext *DC = getDeclContext();
367  assert(DC && "This decl is not contained in a translation unit!");
368 
369  while (!DC->isTranslationUnit()) {
370  DC = DC->getParent();
371  assert(DC && "This decl is not contained in a translation unit!");
372  }
373 
374  return cast<TranslationUnitDecl>(DC);
375 }
376 
379 }
380 
383 }
384 
385 unsigned Decl::getMaxAlignment() const {
386  if (!hasAttrs())
387  return 0;
388 
389  unsigned Align = 0;
390  const AttrVec &V = getAttrs();
391  ASTContext &Ctx = getASTContext();
392  specific_attr_iterator<AlignedAttr> I(V.begin()), E(V.end());
393  for (; I != E; ++I)
394  Align = std::max(Align, I->getAlignment(Ctx));
395  return Align;
396 }
397 
398 bool Decl::isUsed(bool CheckUsedAttr) const {
399  const Decl *CanonD = getCanonicalDecl();
400  if (CanonD->Used)
401  return true;
402 
403  // Check for used attribute.
404  // Ask the most recent decl, since attributes accumulate in the redecl chain.
405  if (CheckUsedAttr && getMostRecentDecl()->hasAttr<UsedAttr>())
406  return true;
407 
408  // The information may have not been deserialized yet. Force deserialization
409  // to complete the needed information.
410  return getMostRecentDecl()->getCanonicalDecl()->Used;
411 }
412 
414  if (isUsed(false))
415  return;
416 
417  if (C.getASTMutationListener())
419 
420  setIsUsed();
421 }
422 
423 bool Decl::isReferenced() const {
424  if (Referenced)
425  return true;
426 
427  // Check redeclarations.
428  for (const auto *I : redecls())
429  if (I->Referenced)
430  return true;
431 
432  return false;
433 }
434 
435 ExternalSourceSymbolAttr *Decl::getExternalSourceSymbolAttr() const {
436  const Decl *Definition = nullptr;
437  if (auto *ID = dyn_cast<ObjCInterfaceDecl>(this)) {
438  Definition = ID->getDefinition();
439  } else if (auto *PD = dyn_cast<ObjCProtocolDecl>(this)) {
440  Definition = PD->getDefinition();
441  } else if (auto *TD = dyn_cast<TagDecl>(this)) {
442  Definition = TD->getDefinition();
443  }
444  if (!Definition)
445  Definition = this;
446 
447  if (auto *attr = Definition->getAttr<ExternalSourceSymbolAttr>())
448  return attr;
449  if (auto *dcd = dyn_cast<Decl>(getDeclContext())) {
450  return dcd->getAttr<ExternalSourceSymbolAttr>();
451  }
452 
453  return nullptr;
454 }
455 
456 bool Decl::hasDefiningAttr() const {
457  return hasAttr<AliasAttr>() || hasAttr<IFuncAttr>();
458 }
459 
460 const Attr *Decl::getDefiningAttr() const {
461  if (auto *AA = getAttr<AliasAttr>())
462  return AA;
463  if (auto *IFA = getAttr<IFuncAttr>())
464  return IFA;
465  return nullptr;
466 }
467 
468 static StringRef getRealizedPlatform(const AvailabilityAttr *A,
469  const ASTContext &Context) {
470  // Check if this is an App Extension "platform", and if so chop off
471  // the suffix for matching with the actual platform.
472  StringRef RealizedPlatform = A->getPlatform()->getName();
473  if (!Context.getLangOpts().AppExt)
474  return RealizedPlatform;
475  size_t suffix = RealizedPlatform.rfind("_app_extension");
476  if (suffix != StringRef::npos)
477  return RealizedPlatform.slice(0, suffix);
478  return RealizedPlatform;
479 }
480 
481 /// Determine the availability of the given declaration based on
482 /// the target platform.
483 ///
484 /// When it returns an availability result other than \c AR_Available,
485 /// if the \p Message parameter is non-NULL, it will be set to a
486 /// string describing why the entity is unavailable.
487 ///
488 /// FIXME: Make these strings localizable, since they end up in
489 /// diagnostics.
491  const AvailabilityAttr *A,
492  std::string *Message,
493  VersionTuple EnclosingVersion) {
494  if (EnclosingVersion.empty())
495  EnclosingVersion = Context.getTargetInfo().getPlatformMinVersion();
496 
497  if (EnclosingVersion.empty())
498  return AR_Available;
499 
500  StringRef ActualPlatform = A->getPlatform()->getName();
501  StringRef TargetPlatform = Context.getTargetInfo().getPlatformName();
502 
503  // Match the platform name.
504  if (getRealizedPlatform(A, Context) != TargetPlatform)
505  return AR_Available;
506 
507  StringRef PrettyPlatformName
508  = AvailabilityAttr::getPrettyPlatformName(ActualPlatform);
509 
510  if (PrettyPlatformName.empty())
511  PrettyPlatformName = ActualPlatform;
512 
513  std::string HintMessage;
514  if (!A->getMessage().empty()) {
515  HintMessage = " - ";
516  HintMessage += A->getMessage();
517  }
518 
519  // Make sure that this declaration has not been marked 'unavailable'.
520  if (A->getUnavailable()) {
521  if (Message) {
522  Message->clear();
523  llvm::raw_string_ostream Out(*Message);
524  Out << "not available on " << PrettyPlatformName
525  << HintMessage;
526  }
527 
528  return AR_Unavailable;
529  }
530 
531  // Make sure that this declaration has already been introduced.
532  if (!A->getIntroduced().empty() &&
533  EnclosingVersion < A->getIntroduced()) {
534  if (Message) {
535  Message->clear();
536  llvm::raw_string_ostream Out(*Message);
537  VersionTuple VTI(A->getIntroduced());
538  Out << "introduced in " << PrettyPlatformName << ' '
539  << VTI << HintMessage;
540  }
541 
542  return A->getStrict() ? AR_Unavailable : AR_NotYetIntroduced;
543  }
544 
545  // Make sure that this declaration hasn't been obsoleted.
546  if (!A->getObsoleted().empty() && EnclosingVersion >= A->getObsoleted()) {
547  if (Message) {
548  Message->clear();
549  llvm::raw_string_ostream Out(*Message);
550  VersionTuple VTO(A->getObsoleted());
551  Out << "obsoleted in " << PrettyPlatformName << ' '
552  << VTO << HintMessage;
553  }
554 
555  return AR_Unavailable;
556  }
557 
558  // Make sure that this declaration hasn't been deprecated.
559  if (!A->getDeprecated().empty() && EnclosingVersion >= A->getDeprecated()) {
560  if (Message) {
561  Message->clear();
562  llvm::raw_string_ostream Out(*Message);
563  VersionTuple VTD(A->getDeprecated());
564  Out << "first deprecated in " << PrettyPlatformName << ' '
565  << VTD << HintMessage;
566  }
567 
568  return AR_Deprecated;
569  }
570 
571  return AR_Available;
572 }
573 
575  VersionTuple EnclosingVersion,
576  StringRef *RealizedPlatform) const {
577  if (auto *FTD = dyn_cast<FunctionTemplateDecl>(this))
578  return FTD->getTemplatedDecl()->getAvailability(Message, EnclosingVersion,
579  RealizedPlatform);
580 
582  std::string ResultMessage;
583 
584  for (const auto *A : attrs()) {
585  if (const auto *Deprecated = dyn_cast<DeprecatedAttr>(A)) {
586  if (Result >= AR_Deprecated)
587  continue;
588 
589  if (Message)
590  ResultMessage = Deprecated->getMessage();
591 
592  Result = AR_Deprecated;
593  continue;
594  }
595 
596  if (const auto *Unavailable = dyn_cast<UnavailableAttr>(A)) {
597  if (Message)
598  *Message = Unavailable->getMessage();
599  return AR_Unavailable;
600  }
601 
602  if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) {
604  Message, EnclosingVersion);
605 
606  if (AR == AR_Unavailable) {
607  if (RealizedPlatform)
608  *RealizedPlatform = Availability->getPlatform()->getName();
609  return AR_Unavailable;
610  }
611 
612  if (AR > Result) {
613  Result = AR;
614  if (Message)
615  ResultMessage.swap(*Message);
616  }
617  continue;
618  }
619  }
620 
621  if (Message)
622  Message->swap(ResultMessage);
623  return Result;
624 }
625 
626 VersionTuple Decl::getVersionIntroduced() const {
627  const ASTContext &Context = getASTContext();
628  StringRef TargetPlatform = Context.getTargetInfo().getPlatformName();
629  for (const auto *A : attrs()) {
630  if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) {
631  if (getRealizedPlatform(Availability, Context) != TargetPlatform)
632  continue;
633  if (!Availability->getIntroduced().empty())
634  return Availability->getIntroduced();
635  }
636  }
637  return {};
638 }
639 
640 bool Decl::canBeWeakImported(bool &IsDefinition) const {
641  IsDefinition = false;
642 
643  // Variables, if they aren't definitions.
644  if (const auto *Var = dyn_cast<VarDecl>(this)) {
645  if (Var->isThisDeclarationADefinition()) {
646  IsDefinition = true;
647  return false;
648  }
649  return true;
650 
651  // Functions, if they aren't definitions.
652  } else if (const auto *FD = dyn_cast<FunctionDecl>(this)) {
653  if (FD->hasBody()) {
654  IsDefinition = true;
655  return false;
656  }
657  return true;
658 
659  // Objective-C classes, if this is the non-fragile runtime.
660  } else if (isa<ObjCInterfaceDecl>(this) &&
662  return true;
663 
664  // Nothing else.
665  } else {
666  return false;
667  }
668 }
669 
670 bool Decl::isWeakImported() const {
671  bool IsDefinition;
672  if (!canBeWeakImported(IsDefinition))
673  return false;
674 
675  for (const auto *A : attrs()) {
676  if (isa<WeakImportAttr>(A))
677  return true;
678 
679  if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) {
680  if (CheckAvailability(getASTContext(), Availability, nullptr,
681  VersionTuple()) == AR_NotYetIntroduced)
682  return true;
683  }
684  }
685 
686  return false;
687 }
688 
690  switch (DeclKind) {
691  case Function:
692  case CXXDeductionGuide:
693  case CXXMethod:
694  case CXXConstructor:
695  case ConstructorUsingShadow:
696  case CXXDestructor:
697  case CXXConversion:
698  case EnumConstant:
699  case Var:
700  case ImplicitParam:
701  case ParmVar:
702  case ObjCMethod:
703  case ObjCProperty:
704  case MSProperty:
705  return IDNS_Ordinary;
706  case Label:
707  return IDNS_Label;
708  case IndirectField:
709  return IDNS_Ordinary | IDNS_Member;
710 
711  case Binding:
712  case NonTypeTemplateParm:
713  case VarTemplate:
714  case Concept:
715  // These (C++-only) declarations are found by redeclaration lookup for
716  // tag types, so we include them in the tag namespace.
717  return IDNS_Ordinary | IDNS_Tag;
718 
719  case ObjCCompatibleAlias:
720  case ObjCInterface:
721  return IDNS_Ordinary | IDNS_Type;
722 
723  case Typedef:
724  case TypeAlias:
725  case TemplateTypeParm:
726  case ObjCTypeParam:
727  return IDNS_Ordinary | IDNS_Type;
728 
729  case UnresolvedUsingTypename:
731 
732  case UsingShadow:
733  return 0; // we'll actually overwrite this later
734 
735  case UnresolvedUsingValue:
736  return IDNS_Ordinary | IDNS_Using;
737 
738  case Using:
739  case UsingPack:
740  return IDNS_Using;
741 
742  case ObjCProtocol:
743  return IDNS_ObjCProtocol;
744 
745  case Field:
746  case ObjCAtDefsField:
747  case ObjCIvar:
748  return IDNS_Member;
749 
750  case Record:
751  case CXXRecord:
752  case Enum:
753  return IDNS_Tag | IDNS_Type;
754 
755  case Namespace:
756  case NamespaceAlias:
757  return IDNS_Namespace;
758 
759  case FunctionTemplate:
760  return IDNS_Ordinary;
761 
762  case ClassTemplate:
763  case TemplateTemplateParm:
764  case TypeAliasTemplate:
765  return IDNS_Ordinary | IDNS_Tag | IDNS_Type;
766 
767  case OMPDeclareReduction:
768  return IDNS_OMPReduction;
769 
770  case OMPDeclareMapper:
771  return IDNS_OMPMapper;
772 
773  // Never have names.
774  case Friend:
775  case FriendTemplate:
776  case AccessSpec:
777  case LinkageSpec:
778  case Export:
779  case FileScopeAsm:
780  case StaticAssert:
781  case ObjCPropertyImpl:
782  case PragmaComment:
783  case PragmaDetectMismatch:
784  case Block:
785  case Captured:
786  case TranslationUnit:
787  case ExternCContext:
788  case Decomposition:
789 
790  case UsingDirective:
791  case BuiltinTemplate:
792  case ClassTemplateSpecialization:
793  case ClassTemplatePartialSpecialization:
794  case ClassScopeFunctionSpecialization:
795  case VarTemplateSpecialization:
796  case VarTemplatePartialSpecialization:
797  case ObjCImplementation:
798  case ObjCCategory:
799  case ObjCCategoryImpl:
800  case Import:
801  case OMPThreadPrivate:
802  case OMPAllocate:
803  case OMPRequires:
804  case OMPCapturedExpr:
805  case Empty:
806  case LifetimeExtendedTemporary:
807  case RequiresExprBody:
808  // Never looked up by name.
809  return 0;
810  }
811 
812  llvm_unreachable("Invalid DeclKind!");
813 }
814 
815 void Decl::setAttrsImpl(const AttrVec &attrs, ASTContext &Ctx) {
816  assert(!HasAttrs && "Decl already contains attrs.");
817 
818  AttrVec &AttrBlank = Ctx.getDeclAttrs(this);
819  assert(AttrBlank.empty() && "HasAttrs was wrong?");
820 
821  AttrBlank = attrs;
822  HasAttrs = true;
823 }
824 
826  if (!HasAttrs) return;
827 
828  HasAttrs = false;
830 }
831 
832 void Decl::addAttr(Attr *A) {
833  if (!hasAttrs()) {
834  setAttrs(AttrVec(1, A));
835  return;
836  }
837 
838  AttrVec &Attrs = getAttrs();
839  if (!A->isInherited()) {
840  Attrs.push_back(A);
841  return;
842  }
843 
844  // Attribute inheritance is processed after attribute parsing. To keep the
845  // order as in the source code, add inherited attributes before non-inherited
846  // ones.
847  auto I = Attrs.begin(), E = Attrs.end();
848  for (; I != E; ++I) {
849  if (!(*I)->isInherited())
850  break;
851  }
852  Attrs.insert(I, A);
853 }
854 
855 const AttrVec &Decl::getAttrs() const {
856  assert(HasAttrs && "No attrs to get!");
857  return getASTContext().getDeclAttrs(this);
858 }
859 
861  Decl::Kind DK = D->getDeclKind();
862  switch(DK) {
863 #define DECL(NAME, BASE)
864 #define DECL_CONTEXT(NAME) \
865  case Decl::NAME: \
866  return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D));
867 #define DECL_CONTEXT_BASE(NAME)
868 #include "clang/AST/DeclNodes.inc"
869  default:
870 #define DECL(NAME, BASE)
871 #define DECL_CONTEXT_BASE(NAME) \
872  if (DK >= first##NAME && DK <= last##NAME) \
873  return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D));
874 #include "clang/AST/DeclNodes.inc"
875  llvm_unreachable("a decl that inherits DeclContext isn't handled");
876  }
877 }
878 
880  Decl::Kind DK = D->getKind();
881  switch(DK) {
882 #define DECL(NAME, BASE)
883 #define DECL_CONTEXT(NAME) \
884  case Decl::NAME: \
885  return static_cast<NAME##Decl *>(const_cast<Decl *>(D));
886 #define DECL_CONTEXT_BASE(NAME)
887 #include "clang/AST/DeclNodes.inc"
888  default:
889 #define DECL(NAME, BASE)
890 #define DECL_CONTEXT_BASE(NAME) \
891  if (DK >= first##NAME && DK <= last##NAME) \
892  return static_cast<NAME##Decl *>(const_cast<Decl *>(D));
893 #include "clang/AST/DeclNodes.inc"
894  llvm_unreachable("a decl that inherits DeclContext isn't handled");
895  }
896 }
897 
899  // Special handling of FunctionDecl to avoid de-serializing the body from PCH.
900  // FunctionDecl stores EndRangeLoc for this purpose.
901  if (const auto *FD = dyn_cast<FunctionDecl>(this)) {
902  const FunctionDecl *Definition;
903  if (FD->hasBody(Definition))
904  return Definition->getSourceRange().getEnd();
905  return {};
906  }
907 
908  if (Stmt *Body = getBody())
909  return Body->getSourceRange().getEnd();
910 
911  return {};
912 }
913 
914 bool Decl::AccessDeclContextSanity() const {
915 #ifndef NDEBUG
916  // Suppress this check if any of the following hold:
917  // 1. this is the translation unit (and thus has no parent)
918  // 2. this is a template parameter (and thus doesn't belong to its context)
919  // 3. this is a non-type template parameter
920  // 4. the context is not a record
921  // 5. it's invalid
922  // 6. it's a C++0x static_assert.
923  // 7. it's a block literal declaration
924  if (isa<TranslationUnitDecl>(this) ||
925  isa<TemplateTypeParmDecl>(this) ||
926  isa<NonTypeTemplateParmDecl>(this) ||
927  !getDeclContext() ||
928  !isa<CXXRecordDecl>(getDeclContext()) ||
929  isInvalidDecl() ||
930  isa<StaticAssertDecl>(this) ||
931  isa<BlockDecl>(this) ||
932  // FIXME: a ParmVarDecl can have ClassTemplateSpecialization
933  // as DeclContext (?).
934  isa<ParmVarDecl>(this) ||
935  // FIXME: a ClassTemplateSpecialization or CXXRecordDecl can have
936  // AS_none as access specifier.
937  isa<CXXRecordDecl>(this) ||
938  isa<ClassScopeFunctionSpecializationDecl>(this))
939  return true;
940 
941  assert(Access != AS_none &&
942  "Access specifier is AS_none inside a record decl");
943 #endif
944  return true;
945 }
946 
947 static Decl::Kind getKind(const Decl *D) { return D->getKind(); }
948 static Decl::Kind getKind(const DeclContext *DC) { return DC->getDeclKind(); }
949 
950 int64_t Decl::getID() const {
951  return getASTContext().getAllocator().identifyKnownAlignedObject<Decl>(this);
952 }
953 
954 const FunctionType *Decl::getFunctionType(bool BlocksToo) const {
955  QualType Ty;
956  if (const auto *D = dyn_cast<ValueDecl>(this))
957  Ty = D->getType();
958  else if (const auto *D = dyn_cast<TypedefNameDecl>(this))
959  Ty = D->getUnderlyingType();
960  else
961  return nullptr;
962 
963  if (Ty->isFunctionPointerType())
964  Ty = Ty->castAs<PointerType>()->getPointeeType();
965  else if (Ty->isFunctionReferenceType())
966  Ty = Ty->castAs<ReferenceType>()->getPointeeType();
967  else if (BlocksToo && Ty->isBlockPointerType())
968  Ty = Ty->castAs<BlockPointerType>()->getPointeeType();
969 
970  return Ty->getAs<FunctionType>();
971 }
972 
973 /// Starting at a given context (a Decl or DeclContext), look for a
974 /// code context that is not a closure (a lambda, block, etc.).
975 template <class T> static Decl *getNonClosureContext(T *D) {
976  if (getKind(D) == Decl::CXXMethod) {
977  auto *MD = cast<CXXMethodDecl>(D);
978  if (MD->getOverloadedOperator() == OO_Call &&
979  MD->getParent()->isLambda())
980  return getNonClosureContext(MD->getParent()->getParent());
981  return MD;
982  } else if (auto *FD = dyn_cast<FunctionDecl>(D))
983  return FD;
984  else if (auto *MD = dyn_cast<ObjCMethodDecl>(D))
985  return MD;
986  else if (auto *BD = dyn_cast<BlockDecl>(D))
987  return getNonClosureContext(BD->getParent());
988  else if (auto *CD = dyn_cast<CapturedDecl>(D))
989  return getNonClosureContext(CD->getParent());
990  else
991  return nullptr;
992 }
993 
996 }
997 
1000 }
1001 
1002 //===----------------------------------------------------------------------===//
1003 // DeclContext Implementation
1004 //===----------------------------------------------------------------------===//
1005 
1007  DeclContextBits.DeclKind = K;
1008  setHasExternalLexicalStorage(false);
1009  setHasExternalVisibleStorage(false);
1010  setNeedToReconcileExternalVisibleStorage(false);
1011  setHasLazyLocalLexicalLookups(false);
1012  setHasLazyExternalLexicalLookups(false);
1013  setUseQualifiedLookup(false);
1014 }
1015 
1016 bool DeclContext::classof(const Decl *D) {
1017  switch (D->getKind()) {
1018 #define DECL(NAME, BASE)
1019 #define DECL_CONTEXT(NAME) case Decl::NAME:
1020 #define DECL_CONTEXT_BASE(NAME)
1021 #include "clang/AST/DeclNodes.inc"
1022  return true;
1023  default:
1024 #define DECL(NAME, BASE)
1025 #define DECL_CONTEXT_BASE(NAME) \
1026  if (D->getKind() >= Decl::first##NAME && \
1027  D->getKind() <= Decl::last##NAME) \
1028  return true;
1029 #include "clang/AST/DeclNodes.inc"
1030  return false;
1031  }
1032 }
1033 
1034 DeclContext::~DeclContext() = default;
1035 
1036 /// Find the parent context of this context that will be
1037 /// used for unqualified name lookup.
1038 ///
1039 /// Generally, the parent lookup context is the semantic context. However, for
1040 /// a friend function the parent lookup context is the lexical context, which
1041 /// is the class in which the friend is declared.
1043  // FIXME: Find a better way to identify friends.
1044  if (isa<FunctionDecl>(this))
1045  if (getParent()->getRedeclContext()->isFileContext() &&
1046  getLexicalParent()->getRedeclContext()->isRecord())
1047  return getLexicalParent();
1048 
1049  // A lookup within the call operator of a lambda never looks in the lambda
1050  // class; instead, skip to the context in which that closure type is
1051  // declared.
1052  if (isLambdaCallOperator(this))
1053  return getParent()->getParent();
1054 
1055  return getParent();
1056 }
1057 
1059  const DeclContext *Ctx = this;
1060 
1061  do {
1062  if (Ctx->isClosure())
1063  return cast<BlockDecl>(Ctx);
1064  Ctx = Ctx->getParent();
1065  } while (Ctx);
1066 
1067  return nullptr;
1068 }
1069 
1071  return isNamespace() &&
1072  cast<NamespaceDecl>(this)->isInline();
1073 }
1074 
1076  if (!isNamespace())
1077  return false;
1078 
1079  const auto *ND = cast<NamespaceDecl>(this);
1080  if (ND->isInline()) {
1081  return ND->getParent()->isStdNamespace();
1082  }
1083 
1084  if (!getParent()->getRedeclContext()->isTranslationUnit())
1085  return false;
1086 
1087  const IdentifierInfo *II = ND->getIdentifier();
1088  return II && II->isStr("std");
1089 }
1090 
1092  if (isFileContext())
1093  return false;
1094 
1095  if (isa<ClassTemplatePartialSpecializationDecl>(this))
1096  return true;
1097 
1098  if (const auto *Record = dyn_cast<CXXRecordDecl>(this)) {
1099  if (Record->getDescribedClassTemplate())
1100  return true;
1101 
1102  if (Record->isDependentLambda())
1103  return true;
1104  }
1105 
1106  if (const auto *Function = dyn_cast<FunctionDecl>(this)) {
1107  if (Function->getDescribedFunctionTemplate())
1108  return true;
1109 
1110  // Friend function declarations are dependent if their *lexical*
1111  // context is dependent.
1112  if (cast<Decl>(this)->getFriendObjectKind())
1113  return getLexicalParent()->isDependentContext();
1114  }
1115 
1116  // FIXME: A variable template is a dependent context, but is not a
1117  // DeclContext. A context within it (such as a lambda-expression)
1118  // should be considered dependent.
1119 
1120  return getParent() && getParent()->isDependentContext();
1121 }
1122 
1124  if (getDeclKind() == Decl::Enum)
1125  return !cast<EnumDecl>(this)->isScoped();
1126  else if (getDeclKind() == Decl::LinkageSpec || getDeclKind() == Decl::Export)
1127  return true;
1128 
1129  return false;
1130 }
1131 
1132 static bool isLinkageSpecContext(const DeclContext *DC,
1134  while (DC->getDeclKind() != Decl::TranslationUnit) {
1135  if (DC->getDeclKind() == Decl::LinkageSpec)
1136  return cast<LinkageSpecDecl>(DC)->getLanguage() == ID;
1137  DC = DC->getLexicalParent();
1138  }
1139  return false;
1140 }
1141 
1144 }
1145 
1147  const DeclContext *DC = this;
1148  while (DC->getDeclKind() != Decl::TranslationUnit) {
1149  if (DC->getDeclKind() == Decl::LinkageSpec &&
1150  cast<LinkageSpecDecl>(DC)->getLanguage() == LinkageSpecDecl::lang_c)
1151  return cast<LinkageSpecDecl>(DC);
1152  DC = DC->getLexicalParent();
1153  }
1154  return nullptr;
1155 }
1156 
1159 }
1160 
1161 bool DeclContext::Encloses(const DeclContext *DC) const {
1162  if (getPrimaryContext() != this)
1163  return getPrimaryContext()->Encloses(DC);
1164 
1165  for (; DC; DC = DC->getParent())
1166  if (DC->getPrimaryContext() == this)
1167  return true;
1168  return false;
1169 }
1170 
1172  switch (getDeclKind()) {
1173  case Decl::TranslationUnit:
1174  case Decl::ExternCContext:
1175  case Decl::LinkageSpec:
1176  case Decl::Export:
1177  case Decl::Block:
1178  case Decl::Captured:
1179  case Decl::OMPDeclareReduction:
1180  case Decl::OMPDeclareMapper:
1181  case Decl::RequiresExprBody:
1182  // There is only one DeclContext for these entities.
1183  return this;
1184 
1185  case Decl::Namespace:
1186  // The original namespace is our primary context.
1187  return static_cast<NamespaceDecl *>(this)->getOriginalNamespace();
1188 
1189  case Decl::ObjCMethod:
1190  return this;
1191 
1192  case Decl::ObjCInterface:
1193  if (auto *OID = dyn_cast<ObjCInterfaceDecl>(this))
1194  if (auto *Def = OID->getDefinition())
1195  return Def;
1196  return this;
1197 
1198  case Decl::ObjCProtocol:
1199  if (auto *OPD = dyn_cast<ObjCProtocolDecl>(this))
1200  if (auto *Def = OPD->getDefinition())
1201  return Def;
1202  return this;
1203 
1204  case Decl::ObjCCategory:
1205  return this;
1206 
1207  case Decl::ObjCImplementation:
1208  case Decl::ObjCCategoryImpl:
1209  return this;
1210 
1211  default:
1212  if (getDeclKind() >= Decl::firstTag && getDeclKind() <= Decl::lastTag) {
1213  // If this is a tag type that has a definition or is currently
1214  // being defined, that definition is our primary context.
1215  auto *Tag = cast<TagDecl>(this);
1216 
1217  if (TagDecl *Def = Tag->getDefinition())
1218  return Def;
1219 
1220  if (const auto *TagTy = dyn_cast<TagType>(Tag->getTypeForDecl())) {
1221  // Note, TagType::getDecl returns the (partial) definition one exists.
1222  TagDecl *PossiblePartialDef = TagTy->getDecl();
1223  if (PossiblePartialDef->isBeingDefined())
1224  return PossiblePartialDef;
1225  } else {
1226  assert(isa<InjectedClassNameType>(Tag->getTypeForDecl()));
1227  }
1228 
1229  return Tag;
1230  }
1231 
1232  assert(getDeclKind() >= Decl::firstFunction &&
1233  getDeclKind() <= Decl::lastFunction &&
1234  "Unknown DeclContext kind");
1235  return this;
1236  }
1237 }
1238 
1239 void
1241  Contexts.clear();
1242 
1243  if (getDeclKind() != Decl::Namespace) {
1244  Contexts.push_back(this);
1245  return;
1246  }
1247 
1248  auto *Self = static_cast<NamespaceDecl *>(this);
1249  for (NamespaceDecl *N = Self->getMostRecentDecl(); N;
1250  N = N->getPreviousDecl())
1251  Contexts.push_back(N);
1252 
1253  std::reverse(Contexts.begin(), Contexts.end());
1254 }
1255 
1256 std::pair<Decl *, Decl *>
1258  bool FieldsAlreadyLoaded) {
1259  // Build up a chain of declarations via the Decl::NextInContextAndBits field.
1260  Decl *FirstNewDecl = nullptr;
1261  Decl *PrevDecl = nullptr;
1262  for (auto *D : Decls) {
1263  if (FieldsAlreadyLoaded && isa<FieldDecl>(D))
1264  continue;
1265 
1266  if (PrevDecl)
1267  PrevDecl->NextInContextAndBits.setPointer(D);
1268  else
1269  FirstNewDecl = D;
1270 
1271  PrevDecl = D;
1272  }
1273 
1274  return std::make_pair(FirstNewDecl, PrevDecl);
1275 }
1276 
1277 /// We have just acquired external visible storage, and we already have
1278 /// built a lookup map. For every name in the map, pull in the new names from
1279 /// the external storage.
1280 void DeclContext::reconcileExternalVisibleStorage() const {
1281  assert(hasNeedToReconcileExternalVisibleStorage() && LookupPtr);
1282  setNeedToReconcileExternalVisibleStorage(false);
1283 
1284  for (auto &Lookup : *LookupPtr)
1285  Lookup.second.setHasExternalDecls();
1286 }
1287 
1288 /// Load the declarations within this lexical storage from an
1289 /// external source.
1290 /// \return \c true if any declarations were added.
1291 bool
1292 DeclContext::LoadLexicalDeclsFromExternalStorage() const {
1293  ExternalASTSource *Source = getParentASTContext().getExternalSource();
1294  assert(hasExternalLexicalStorage() && Source && "No external storage?");
1295 
1296  // Notify that we have a DeclContext that is initializing.
1297  ExternalASTSource::Deserializing ADeclContext(Source);
1298 
1299  // Load the external declarations, if any.
1300  SmallVector<Decl*, 64> Decls;
1301  setHasExternalLexicalStorage(false);
1302  Source->FindExternalLexicalDecls(this, Decls);
1303 
1304  if (Decls.empty())
1305  return false;
1306 
1307  // We may have already loaded just the fields of this record, in which case
1308  // we need to ignore them.
1309  bool FieldsAlreadyLoaded = false;
1310  if (const auto *RD = dyn_cast<RecordDecl>(this))
1311  FieldsAlreadyLoaded = RD->hasLoadedFieldsFromExternalStorage();
1312 
1313  // Splice the newly-read declarations into the beginning of the list
1314  // of declarations.
1315  Decl *ExternalFirst, *ExternalLast;
1316  std::tie(ExternalFirst, ExternalLast) =
1317  BuildDeclChain(Decls, FieldsAlreadyLoaded);
1318  ExternalLast->NextInContextAndBits.setPointer(FirstDecl);
1319  FirstDecl = ExternalFirst;
1320  if (!LastDecl)
1321  LastDecl = ExternalLast;
1322  return true;
1323 }
1324 
1327  DeclarationName Name) {
1328  ASTContext &Context = DC->getParentASTContext();
1329  StoredDeclsMap *Map;
1330  if (!(Map = DC->LookupPtr))
1331  Map = DC->CreateStoredDeclsMap(Context);
1332  if (DC->hasNeedToReconcileExternalVisibleStorage())
1333  DC->reconcileExternalVisibleStorage();
1334 
1335  (*Map)[Name].removeExternalDecls();
1336 
1337  return DeclContext::lookup_result();
1338 }
1339 
1342  DeclarationName Name,
1343  ArrayRef<NamedDecl*> Decls) {
1344  ASTContext &Context = DC->getParentASTContext();
1345  StoredDeclsMap *Map;
1346  if (!(Map = DC->LookupPtr))
1347  Map = DC->CreateStoredDeclsMap(Context);
1348  if (DC->hasNeedToReconcileExternalVisibleStorage())
1349  DC->reconcileExternalVisibleStorage();
1350 
1351  StoredDeclsList &List = (*Map)[Name];
1352 
1353  // Clear out any old external visible declarations, to avoid quadratic
1354  // performance in the redeclaration checks below.
1355  List.removeExternalDecls();
1356 
1357  if (!List.isNull()) {
1358  // We have both existing declarations and new declarations for this name.
1359  // Some of the declarations may simply replace existing ones. Handle those
1360  // first.
1362  for (unsigned I = 0, N = Decls.size(); I != N; ++I)
1363  if (List.HandleRedeclaration(Decls[I], /*IsKnownNewer*/false))
1364  Skip.push_back(I);
1365  Skip.push_back(Decls.size());
1366 
1367  // Add in any new declarations.
1368  unsigned SkipPos = 0;
1369  for (unsigned I = 0, N = Decls.size(); I != N; ++I) {
1370  if (I == Skip[SkipPos])
1371  ++SkipPos;
1372  else
1373  List.AddSubsequentDecl(Decls[I]);
1374  }
1375  } else {
1376  // Convert the array to a StoredDeclsList.
1377  for (auto *D : Decls) {
1378  if (List.isNull())
1379  List.setOnlyValue(D);
1380  else
1381  List.AddSubsequentDecl(D);
1382  }
1383  }
1384 
1385  return List.getLookupResult();
1386 }
1387 
1389  if (hasExternalLexicalStorage())
1390  LoadLexicalDeclsFromExternalStorage();
1391  return decl_iterator(FirstDecl);
1392 }
1393 
1395  if (hasExternalLexicalStorage())
1396  LoadLexicalDeclsFromExternalStorage();
1397 
1398  return !FirstDecl;
1399 }
1400 
1402  return (D->getLexicalDeclContext() == this &&
1403  (D->NextInContextAndBits.getPointer() || D == LastDecl));
1404 }
1405 
1407  if (hasExternalLexicalStorage())
1408  LoadLexicalDeclsFromExternalStorage();
1409  return containsDecl(D);
1410 }
1411 
1412 /// shouldBeHidden - Determine whether a declaration which was declared
1413 /// within its semantic context should be invisible to qualified name lookup.
1414 static bool shouldBeHidden(NamedDecl *D) {
1415  // Skip unnamed declarations.
1416  if (!D->getDeclName())
1417  return true;
1418 
1419  // Skip entities that can't be found by name lookup into a particular
1420  // context.
1421  if ((D->getIdentifierNamespace() == 0 && !isa<UsingDirectiveDecl>(D)) ||
1422  D->isTemplateParameter())
1423  return true;
1424 
1425  // Skip friends and local extern declarations unless they're the first
1426  // declaration of the entity.
1427  if ((D->isLocalExternDecl() || D->getFriendObjectKind()) &&
1428  D != D->getCanonicalDecl())
1429  return true;
1430 
1431  // Skip template specializations.
1432  // FIXME: This feels like a hack. Should DeclarationName support
1433  // template-ids, or is there a better way to keep specializations
1434  // from being visible?
1435  if (isa<ClassTemplateSpecializationDecl>(D))
1436  return true;
1437  if (auto *FD = dyn_cast<FunctionDecl>(D))
1438  if (FD->isFunctionTemplateSpecialization())
1439  return true;
1440 
1441  return false;
1442 }
1443 
1445  assert(D->getLexicalDeclContext() == this &&
1446  "decl being removed from non-lexical context");
1447  assert((D->NextInContextAndBits.getPointer() || D == LastDecl) &&
1448  "decl is not in decls list");
1449 
1450  // Remove D from the decl chain. This is O(n) but hopefully rare.
1451  if (D == FirstDecl) {
1452  if (D == LastDecl)
1453  FirstDecl = LastDecl = nullptr;
1454  else
1455  FirstDecl = D->NextInContextAndBits.getPointer();
1456  } else {
1457  for (Decl *I = FirstDecl; true; I = I->NextInContextAndBits.getPointer()) {
1458  assert(I && "decl not found in linked list");
1459  if (I->NextInContextAndBits.getPointer() == D) {
1460  I->NextInContextAndBits.setPointer(D->NextInContextAndBits.getPointer());
1461  if (D == LastDecl) LastDecl = I;
1462  break;
1463  }
1464  }
1465  }
1466 
1467  // Mark that D is no longer in the decl chain.
1468  D->NextInContextAndBits.setPointer(nullptr);
1469 
1470  // Remove D from the lookup table if necessary.
1471  if (isa<NamedDecl>(D)) {
1472  auto *ND = cast<NamedDecl>(D);
1473 
1474  // Do not try to remove the declaration if that is invisible to qualified
1475  // lookup. E.g. template specializations are skipped.
1476  if (shouldBeHidden(ND))
1477  return;
1478 
1479  // Remove only decls that have a name
1480  if (!ND->getDeclName())
1481  return;
1482 
1483  auto *DC = D->getDeclContext();
1484  do {
1485  StoredDeclsMap *Map = DC->getPrimaryContext()->LookupPtr;
1486  if (Map) {
1487  StoredDeclsMap::iterator Pos = Map->find(ND->getDeclName());
1488  assert(Pos != Map->end() && "no lookup entry for decl");
1489  // Remove the decl only if it is contained.
1490  StoredDeclsList::DeclsTy *Vec = Pos->second.getAsVector();
1491  if ((Vec && is_contained(*Vec, ND)) || Pos->second.getAsDecl() == ND)
1492  Pos->second.remove(ND);
1493  }
1494  } while (DC->isTransparentContext() && (DC = DC->getParent()));
1495  }
1496 }
1497 
1499  assert(D->getLexicalDeclContext() == this &&
1500  "Decl inserted into wrong lexical context");
1501  assert(!D->getNextDeclInContext() && D != LastDecl &&
1502  "Decl already inserted into a DeclContext");
1503 
1504  if (FirstDecl) {
1505  LastDecl->NextInContextAndBits.setPointer(D);
1506  LastDecl = D;
1507  } else {
1508  FirstDecl = LastDecl = D;
1509  }
1510 
1511  // Notify a C++ record declaration that we've added a member, so it can
1512  // update its class-specific state.
1513  if (auto *Record = dyn_cast<CXXRecordDecl>(this))
1514  Record->addedMember(D);
1515 
1516  // If this is a newly-created (not de-serialized) import declaration, wire
1517  // it in to the list of local import declarations.
1518  if (!D->isFromASTFile()) {
1519  if (auto *Import = dyn_cast<ImportDecl>(D))
1520  D->getASTContext().addedLocalImportDecl(Import);
1521  }
1522 }
1523 
1525  addHiddenDecl(D);
1526 
1527  if (auto *ND = dyn_cast<NamedDecl>(D))
1528  ND->getDeclContext()->getPrimaryContext()->
1529  makeDeclVisibleInContextWithFlags(ND, false, true);
1530 }
1531 
1533  addHiddenDecl(D);
1534 
1535  if (auto *ND = dyn_cast<NamedDecl>(D))
1536  ND->getDeclContext()->getPrimaryContext()->
1537  makeDeclVisibleInContextWithFlags(ND, true, true);
1538 }
1539 
1540 /// buildLookup - Build the lookup data structure with all of the
1541 /// declarations in this DeclContext (and any other contexts linked
1542 /// to it or transparent contexts nested within it) and return it.
1543 ///
1544 /// Note that the produced map may miss out declarations from an
1545 /// external source. If it does, those entries will be marked with
1546 /// the 'hasExternalDecls' flag.
1548  assert(this == getPrimaryContext() && "buildLookup called on non-primary DC");
1549 
1550  if (!hasLazyLocalLexicalLookups() &&
1551  !hasLazyExternalLexicalLookups())
1552  return LookupPtr;
1553 
1555  collectAllContexts(Contexts);
1556 
1557  if (hasLazyExternalLexicalLookups()) {
1558  setHasLazyExternalLexicalLookups(false);
1559  for (auto *DC : Contexts) {
1560  if (DC->hasExternalLexicalStorage()) {
1561  bool LoadedDecls = DC->LoadLexicalDeclsFromExternalStorage();
1562  setHasLazyLocalLexicalLookups(
1563  hasLazyLocalLexicalLookups() | LoadedDecls );
1564  }
1565  }
1566 
1567  if (!hasLazyLocalLexicalLookups())
1568  return LookupPtr;
1569  }
1570 
1571  for (auto *DC : Contexts)
1572  buildLookupImpl(DC, hasExternalVisibleStorage());
1573 
1574  // We no longer have any lazy decls.
1575  setHasLazyLocalLexicalLookups(false);
1576  return LookupPtr;
1577 }
1578 
1579 /// buildLookupImpl - Build part of the lookup data structure for the
1580 /// declarations contained within DCtx, which will either be this
1581 /// DeclContext, a DeclContext linked to it, or a transparent context
1582 /// nested within it.
1583 void DeclContext::buildLookupImpl(DeclContext *DCtx, bool Internal) {
1584  for (auto *D : DCtx->noload_decls()) {
1585  // Insert this declaration into the lookup structure, but only if
1586  // it's semantically within its decl context. Any other decls which
1587  // should be found in this context are added eagerly.
1588  //
1589  // If it's from an AST file, don't add it now. It'll get handled by
1590  // FindExternalVisibleDeclsByName if needed. Exception: if we're not
1591  // in C++, we do not track external visible decls for the TU, so in
1592  // that case we need to collect them all here.
1593  if (auto *ND = dyn_cast<NamedDecl>(D))
1594  if (ND->getDeclContext() == DCtx && !shouldBeHidden(ND) &&
1595  (!ND->isFromASTFile() ||
1596  (isTranslationUnit() &&
1597  !getParentASTContext().getLangOpts().CPlusPlus)))
1598  makeDeclVisibleInContextImpl(ND, Internal);
1599 
1600  // If this declaration is itself a transparent declaration context
1601  // or inline namespace, add the members of this declaration of that
1602  // context (recursively).
1603  if (auto *InnerCtx = dyn_cast<DeclContext>(D))
1604  if (InnerCtx->isTransparentContext() || InnerCtx->isInlineNamespace())
1605  buildLookupImpl(InnerCtx, Internal);
1606  }
1607 }
1608 
1609 NamedDecl *const DeclContextLookupResult::SingleElementDummyList = nullptr;
1610 
1613  assert(getDeclKind() != Decl::LinkageSpec &&
1614  getDeclKind() != Decl::Export &&
1615  "should not perform lookups into transparent contexts");
1616 
1617  const DeclContext *PrimaryContext = getPrimaryContext();
1618  if (PrimaryContext != this)
1619  return PrimaryContext->lookup(Name);
1620 
1621  // If we have an external source, ensure that any later redeclarations of this
1622  // context have been loaded, since they may add names to the result of this
1623  // lookup (or add external visible storage).
1624  ExternalASTSource *Source = getParentASTContext().getExternalSource();
1625  if (Source)
1626  (void)cast<Decl>(this)->getMostRecentDecl();
1627 
1628  if (hasExternalVisibleStorage()) {
1629  assert(Source && "external visible storage but no external source?");
1630 
1631  if (hasNeedToReconcileExternalVisibleStorage())
1632  reconcileExternalVisibleStorage();
1633 
1634  StoredDeclsMap *Map = LookupPtr;
1635 
1636  if (hasLazyLocalLexicalLookups() ||
1637  hasLazyExternalLexicalLookups())
1638  // FIXME: Make buildLookup const?
1639  Map = const_cast<DeclContext*>(this)->buildLookup();
1640 
1641  if (!Map)
1642  Map = CreateStoredDeclsMap(getParentASTContext());
1643 
1644  // If we have a lookup result with no external decls, we are done.
1645  std::pair<StoredDeclsMap::iterator, bool> R =
1646  Map->insert(std::make_pair(Name, StoredDeclsList()));
1647  if (!R.second && !R.first->second.hasExternalDecls())
1648  return R.first->second.getLookupResult();
1649 
1650  if (Source->FindExternalVisibleDeclsByName(this, Name) || !R.second) {
1651  if (StoredDeclsMap *Map = LookupPtr) {
1652  StoredDeclsMap::iterator I = Map->find(Name);
1653  if (I != Map->end())
1654  return I->second.getLookupResult();
1655  }
1656  }
1657 
1658  return {};
1659  }
1660 
1661  StoredDeclsMap *Map = LookupPtr;
1662  if (hasLazyLocalLexicalLookups() ||
1663  hasLazyExternalLexicalLookups())
1664  Map = const_cast<DeclContext*>(this)->buildLookup();
1665 
1666  if (!Map)
1667  return {};
1668 
1669  StoredDeclsMap::iterator I = Map->find(Name);
1670  if (I == Map->end())
1671  return {};
1672 
1673  return I->second.getLookupResult();
1674 }
1675 
1678  assert(getDeclKind() != Decl::LinkageSpec &&
1679  getDeclKind() != Decl::Export &&
1680  "should not perform lookups into transparent contexts");
1681 
1682  DeclContext *PrimaryContext = getPrimaryContext();
1683  if (PrimaryContext != this)
1684  return PrimaryContext->noload_lookup(Name);
1685 
1686  loadLazyLocalLexicalLookups();
1687  StoredDeclsMap *Map = LookupPtr;
1688  if (!Map)
1689  return {};
1690 
1691  StoredDeclsMap::iterator I = Map->find(Name);
1692  return I != Map->end() ? I->second.getLookupResult()
1693  : lookup_result();
1694 }
1695 
1696 // If we have any lazy lexical declarations not in our lookup map, add them
1697 // now. Don't import any external declarations, not even if we know we have
1698 // some missing from the external visible lookups.
1699 void DeclContext::loadLazyLocalLexicalLookups() {
1700  if (hasLazyLocalLexicalLookups()) {
1702  collectAllContexts(Contexts);
1703  for (auto *Context : Contexts)
1704  buildLookupImpl(Context, hasExternalVisibleStorage());
1705  setHasLazyLocalLexicalLookups(false);
1706  }
1707 }
1708 
1710  SmallVectorImpl<NamedDecl *> &Results) {
1711  Results.clear();
1712 
1713  // If there's no external storage, just perform a normal lookup and copy
1714  // the results.
1715  if (!hasExternalVisibleStorage() && !hasExternalLexicalStorage() && Name) {
1716  lookup_result LookupResults = lookup(Name);
1717  Results.insert(Results.end(), LookupResults.begin(), LookupResults.end());
1718  return;
1719  }
1720 
1721  // If we have a lookup table, check there first. Maybe we'll get lucky.
1722  // FIXME: Should we be checking these flags on the primary context?
1723  if (Name && !hasLazyLocalLexicalLookups() &&
1724  !hasLazyExternalLexicalLookups()) {
1725  if (StoredDeclsMap *Map = LookupPtr) {
1726  StoredDeclsMap::iterator Pos = Map->find(Name);
1727  if (Pos != Map->end()) {
1728  Results.insert(Results.end(),
1729  Pos->second.getLookupResult().begin(),
1730  Pos->second.getLookupResult().end());
1731  return;
1732  }
1733  }
1734  }
1735 
1736  // Slow case: grovel through the declarations in our chain looking for
1737  // matches.
1738  // FIXME: If we have lazy external declarations, this will not find them!
1739  // FIXME: Should we CollectAllContexts and walk them all here?
1740  for (Decl *D = FirstDecl; D; D = D->getNextDeclInContext()) {
1741  if (auto *ND = dyn_cast<NamedDecl>(D))
1742  if (ND->getDeclName() == Name)
1743  Results.push_back(ND);
1744  }
1745 }
1746 
1748  DeclContext *Ctx = this;
1749 
1750  // In C, a record type is the redeclaration context for its fields only. If
1751  // we arrive at a record context after skipping anything else, we should skip
1752  // the record as well. Currently, this means skipping enumerations because
1753  // they're the only transparent context that can exist within a struct or
1754  // union.
1755  bool SkipRecords = getDeclKind() == Decl::Kind::Enum &&
1756  !getParentASTContext().getLangOpts().CPlusPlus;
1757 
1758  // Skip through contexts to get to the redeclaration context. Transparent
1759  // contexts are always skipped.
1760  while ((SkipRecords && Ctx->isRecord()) || Ctx->isTransparentContext())
1761  Ctx = Ctx->getParent();
1762  return Ctx;
1763 }
1764 
1766  DeclContext *Ctx = this;
1767  // Skip through non-namespace, non-translation-unit contexts.
1768  while (!Ctx->isFileContext())
1769  Ctx = Ctx->getParent();
1770  return Ctx->getPrimaryContext();
1771 }
1772 
1774  // Loop until we find a non-record context.
1775  RecordDecl *OutermostRD = nullptr;
1776  DeclContext *DC = this;
1777  while (DC->isRecord()) {
1778  OutermostRD = cast<RecordDecl>(DC);
1779  DC = DC->getLexicalParent();
1780  }
1781  return OutermostRD;
1782 }
1783 
1785  // For non-file contexts, this is equivalent to Equals.
1786  if (!isFileContext())
1787  return O->Equals(this);
1788 
1789  do {
1790  if (O->Equals(this))
1791  return true;
1792 
1793  const auto *NS = dyn_cast<NamespaceDecl>(O);
1794  if (!NS || !NS->isInline())
1795  break;
1796  O = NS->getParent();
1797  } while (O);
1798 
1799  return false;
1800 }
1801 
1803  DeclContext *PrimaryDC = this->getPrimaryContext();
1804  DeclContext *DeclDC = D->getDeclContext()->getPrimaryContext();
1805  // If the decl is being added outside of its semantic decl context, we
1806  // need to ensure that we eagerly build the lookup information for it.
1807  PrimaryDC->makeDeclVisibleInContextWithFlags(D, false, PrimaryDC == DeclDC);
1808 }
1809 
1810 void DeclContext::makeDeclVisibleInContextWithFlags(NamedDecl *D, bool Internal,
1811  bool Recoverable) {
1812  assert(this == getPrimaryContext() && "expected a primary DC");
1813 
1814  if (!isLookupContext()) {
1815  if (isTransparentContext())
1816  getParent()->getPrimaryContext()
1817  ->makeDeclVisibleInContextWithFlags(D, Internal, Recoverable);
1818  return;
1819  }
1820 
1821  // Skip declarations which should be invisible to name lookup.
1822  if (shouldBeHidden(D))
1823  return;
1824 
1825  // If we already have a lookup data structure, perform the insertion into
1826  // it. If we might have externally-stored decls with this name, look them
1827  // up and perform the insertion. If this decl was declared outside its
1828  // semantic context, buildLookup won't add it, so add it now.
1829  //
1830  // FIXME: As a performance hack, don't add such decls into the translation
1831  // unit unless we're in C++, since qualified lookup into the TU is never
1832  // performed.
1833  if (LookupPtr || hasExternalVisibleStorage() ||
1834  ((!Recoverable || D->getDeclContext() != D->getLexicalDeclContext()) &&
1835  (getParentASTContext().getLangOpts().CPlusPlus ||
1836  !isTranslationUnit()))) {
1837  // If we have lazily omitted any decls, they might have the same name as
1838  // the decl which we are adding, so build a full lookup table before adding
1839  // this decl.
1840  buildLookup();
1841  makeDeclVisibleInContextImpl(D, Internal);
1842  } else {
1843  setHasLazyLocalLexicalLookups(true);
1844  }
1845 
1846  // If we are a transparent context or inline namespace, insert into our
1847  // parent context, too. This operation is recursive.
1848  if (isTransparentContext() || isInlineNamespace())
1849  getParent()->getPrimaryContext()->
1850  makeDeclVisibleInContextWithFlags(D, Internal, Recoverable);
1851 
1852  auto *DCAsDecl = cast<Decl>(this);
1853  // Notify that a decl was made visible unless we are a Tag being defined.
1854  if (!(isa<TagDecl>(DCAsDecl) && cast<TagDecl>(DCAsDecl)->isBeingDefined()))
1855  if (ASTMutationListener *L = DCAsDecl->getASTMutationListener())
1856  L->AddedVisibleDecl(this, D);
1857 }
1858 
1859 void DeclContext::makeDeclVisibleInContextImpl(NamedDecl *D, bool Internal) {
1860  // Find or create the stored declaration map.
1861  StoredDeclsMap *Map = LookupPtr;
1862  if (!Map) {
1863  ASTContext *C = &getParentASTContext();
1864  Map = CreateStoredDeclsMap(*C);
1865  }
1866 
1867  // If there is an external AST source, load any declarations it knows about
1868  // with this declaration's name.
1869  // If the lookup table contains an entry about this name it means that we
1870  // have already checked the external source.
1871  if (!Internal)
1872  if (ExternalASTSource *Source = getParentASTContext().getExternalSource())
1873  if (hasExternalVisibleStorage() &&
1874  Map->find(D->getDeclName()) == Map->end())
1875  Source->FindExternalVisibleDeclsByName(this, D->getDeclName());
1876 
1877  // Insert this declaration into the map.
1878  StoredDeclsList &DeclNameEntries = (*Map)[D->getDeclName()];
1879 
1880  if (Internal) {
1881  // If this is being added as part of loading an external declaration,
1882  // this may not be the only external declaration with this name.
1883  // In this case, we never try to replace an existing declaration; we'll
1884  // handle that when we finalize the list of declarations for this name.
1885  DeclNameEntries.setHasExternalDecls();
1886  DeclNameEntries.AddSubsequentDecl(D);
1887  return;
1888  }
1889 
1890  if (DeclNameEntries.isNull()) {
1891  DeclNameEntries.setOnlyValue(D);
1892  return;
1893  }
1894 
1895  if (DeclNameEntries.HandleRedeclaration(D, /*IsKnownNewer*/!Internal)) {
1896  // This declaration has replaced an existing one for which
1897  // declarationReplaces returns true.
1898  return;
1899  }
1900 
1901  // Put this declaration into the appropriate slot.
1902  DeclNameEntries.AddSubsequentDecl(D);
1903 }
1904 
1906  return cast<UsingDirectiveDecl>(*I);
1907 }
1908 
1909 /// Returns iterator range [First, Last) of UsingDirectiveDecls stored within
1910 /// this context.
1912  // FIXME: Use something more efficient than normal lookup for using
1913  // directives. In C++, using directives are looked up more than anything else.
1914  lookup_result Result = lookup(UsingDirectiveDecl::getName());
1915  return udir_range(Result.begin(), Result.end());
1916 }
1917 
1918 //===----------------------------------------------------------------------===//
1919 // Creation and Destruction of StoredDeclsMaps. //
1920 //===----------------------------------------------------------------------===//
1921 
1922 StoredDeclsMap *DeclContext::CreateStoredDeclsMap(ASTContext &C) const {
1923  assert(!LookupPtr && "context already has a decls map");
1924  assert(getPrimaryContext() == this &&
1925  "creating decls map on non-primary context");
1926 
1927  StoredDeclsMap *M;
1928  bool Dependent = isDependentContext();
1929  if (Dependent)
1930  M = new DependentStoredDeclsMap();
1931  else
1932  M = new StoredDeclsMap();
1933  M->Previous = C.LastSDM;
1934  C.LastSDM = llvm::PointerIntPair<StoredDeclsMap*,1>(M, Dependent);
1935  LookupPtr = M;
1936  return M;
1937 }
1938 
1939 void ASTContext::ReleaseDeclContextMaps() {
1940  // It's okay to delete DependentStoredDeclsMaps via a StoredDeclsMap
1941  // pointer because the subclass doesn't add anything that needs to
1942  // be deleted.
1943  StoredDeclsMap::DestroyAll(LastSDM.getPointer(), LastSDM.getInt());
1944 }
1945 
1946 void StoredDeclsMap::DestroyAll(StoredDeclsMap *Map, bool Dependent) {
1947  while (Map) {
1948  // Advance the iteration before we invalidate memory.
1949  llvm::PointerIntPair<StoredDeclsMap*,1> Next = Map->Previous;
1950 
1951  if (Dependent)
1952  delete static_cast<DependentStoredDeclsMap*>(Map);
1953  else
1954  delete Map;
1955 
1956  Map = Next.getPointer();
1957  Dependent = Next.getInt();
1958  }
1959 }
1960 
1963  const PartialDiagnostic &PDiag) {
1964  assert(Parent->isDependentContext()
1965  && "cannot iterate dependent diagnostics of non-dependent context");
1966  Parent = Parent->getPrimaryContext();
1967  if (!Parent->LookupPtr)
1968  Parent->CreateStoredDeclsMap(C);
1969 
1970  auto *Map = static_cast<DependentStoredDeclsMap *>(Parent->LookupPtr);
1971 
1972  // Allocate the copy of the PartialDiagnostic via the ASTContext's
1973  // BumpPtrAllocator, rather than the ASTContext itself.
1974  PartialDiagnostic::Storage *DiagStorage = nullptr;
1975  if (PDiag.hasStorage())
1976  DiagStorage = new (C) PartialDiagnostic::Storage;
1977 
1978  auto *DD = new (C) DependentDiagnostic(PDiag, DiagStorage);
1979 
1980  // TODO: Maybe we shouldn't reverse the order during insertion.
1981  DD->NextDiagnostic = Map->FirstDiagnostic;
1982  Map->FirstDiagnostic = DD;
1983 
1984  return DD;
1985 }
static StringRef getRealizedPlatform(const AvailabilityAttr *A, const ASTContext &Context)
Definition: DeclBase.cpp:468
Defines the clang::ASTContext interface.
Represents a function declaration or definition.
Definition: Decl.h:1783
AttrVec & getDeclAttrs(const Decl *D)
Retrieve the attributes for the given declaration.
void localUncachedLookup(DeclarationName Name, SmallVectorImpl< NamedDecl *> &Results)
A simplistic name lookup mechanism that performs name lookup into this declaration context without co...
Definition: DeclBase.cpp:1709
VersionTuple getPlatformMinVersion() const
Retrieve the minimum desired version of the platform, to which the program should be compiled...
Definition: TargetInfo.h:1269
static DeclContext * castToDeclContext(const Decl *)
Definition: DeclBase.cpp:879
Module * getOwningModule() const
Get the module that owns this declaration (for visibility purposes).
Definition: DeclBase.h:759
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2614
QualType getPointeeType() const
Definition: Type.h:2627
static bool shouldBeHidden(NamedDecl *D)
shouldBeHidden - Determine whether a declaration which was declared within its semantic context shoul...
Definition: DeclBase.cpp:1414
A (possibly-)qualified type.
Definition: Type.h:654
bool isBlockPointerType() const
Definition: Type.h:6512
TagDecl * getDefinition() const
Returns the TagDecl that actually defines this struct/union/class/enum.
Definition: Decl.cpp:4177
const char * getDeclKindName() const
Definition: DeclBase.cpp:123
llvm::PointerIntPair< Decl *, 2, ModuleOwnershipKind > NextInContextAndBits
The next declaration within the same lexical DeclContext.
Definition: DeclBase.h:244
void AddSubsequentDecl(NamedDecl *D)
AddSubsequentDecl - This is called on the second and later decl when it is not a redeclaration to mer...
virtual void FindExternalLexicalDecls(const DeclContext *DC, llvm::function_ref< bool(Decl::Kind)> IsKindWeWant, SmallVectorImpl< Decl *> &Result)
Finds all declarations lexically contained within the given DeclContext, after applying an optional f...
RAII class for safely pairing a StartedDeserializing call with FinishedDeserializing.
static Decl * castFromDeclContext(const DeclContext *)
Definition: DeclBase.cpp:860
bool isClosure() const
Definition: DeclBase.h:1817
virtual Stmt * getBody() const
getBody - If this Decl represents a declaration for a body of code, such as a function or method defi...
Definition: DeclBase.h:986
void setAttrs(const AttrVec &Attrs)
Definition: DeclBase.h:486
static bool isLinkageSpecContext(const DeclContext *DC, LinkageSpecDecl::LanguageIDs ID)
Definition: DeclBase.cpp:1132
Stmt - This represents one statement.
Definition: Stmt.h:66
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:3422
C Language Family Type Representation.
const char * getDeclKindName() const
Definition: DeclBase.cpp:155
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:88
specific_attr_iterator - Iterates over a subrange of an AttrVec, only providing attributes that are o...
Definition: AttrIterator.h:34
static void add(Kind k)
Definition: DeclBase.cpp:193
Defines the C++ template declaration subclasses.
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
Defines types useful for describing an Objective-C runtime.
Represent a C++ namespace.
Definition: Decl.h:497
const TargetInfo & getTargetInfo() const
Definition: ASTContext.h:707
unsigned getIdentifierNamespace() const
Definition: DeclBase.h:799
static Decl * getNonClosureContext(T *D)
Starting at a given context (a Decl or DeclContext), look for a code context that is not a closure (a...
Definition: DeclBase.cpp:975
const DeclContext * getParentFunctionOrMethod() const
If this decl is defined inside a function/method/block it returns the corresponding DeclContext...
Definition: DeclBase.cpp:254
unsigned Access
Access - Used by C++ decls for the access specifier.
Definition: DeclBase.h:325
bool HandleRedeclaration(NamedDecl *D, bool IsKnownNewer)
HandleRedeclaration - If this is a redeclaration of an existing decl, replace the old one with D and ...
This file provides some common utility functions for processing Lambda related AST Constructs...
bool hasOwningModule() const
Is this declaration owned by some module?
Definition: DeclBase.h:754
ASTMutationListener * getASTMutationListener() const
Definition: DeclBase.cpp:381
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:7002
bool hasLocalOwningModuleStorage() const
Definition: DeclBase.cpp:119
bool isExternCContext() const
Determines whether this context or some of its ancestors is a linkage specification context that spec...
Definition: DeclBase.cpp:1142
bool isInvalidDecl() const
Definition: DeclBase.h:553
ExternalSourceSymbolAttr * getExternalSourceSymbolAttr() const
Looks on this and related declarations for an applicable external source symbol attribute.
Definition: DeclBase.cpp:435
bool isParameterPack() const
Whether this declaration is a parameter pack.
Definition: DeclBase.cpp:211
void removeDecl(Decl *D)
Removes a declaration from this context.
Definition: DeclBase.cpp:1444
bool hasWeakClassImport() const
Does this runtime support weakly importing classes?
Definition: ObjCRuntime.h:361
Types, declared with &#39;struct foo&#39;, typedefs, etc.
Definition: DeclBase.h:132
bool isLexicallyWithinFunctionOrMethod() const
Returns true if this declaration lexically is inside a function.
Definition: DeclBase.cpp:335
Represents a struct/union/class.
Definition: Decl.h:3748
DeclarationName getDeclName() const
Get the actual, stored name of the declaration, which may be a special name.
Definition: Decl.h:272
bool Encloses(const DeclContext *DC) const
Determine whether this declaration context encloses the declaration context DC.
Definition: DeclBase.cpp:1161
One of these records is kept for each identifier that is lexed.
bool isInAnonymousNamespace() const
Definition: DeclBase.cpp:347
bool isStr(const char(&Str)[StrLen]) const
Return true if this is the identifier for the specified string.
static DeclContextLookupResult SetExternalVisibleDeclsForName(const DeclContext *DC, DeclarationName Name, ArrayRef< NamedDecl *> Decls)
Definition: DeclBase.cpp:1341
QualType getPointeeType() const
Definition: Type.h:2731
void print(raw_ostream &OS, const SourceManager &SM) const
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:168
The results of name lookup within a DeclContext.
Definition: DeclBase.h:1195
__SIZE_TYPE__ size_t
The unsigned integer type of the result of the sizeof operator.
Definition: opencl-c-base.h:40
bool Equals(const DeclContext *DC) const
Determine whether this declaration context is equivalent to the declaration context DC...
Definition: DeclBase.h:1908
__DEVICE__ int max(int __a, int __b)
Describes a module or submodule.
Definition: Module.h:64
virtual void updateOutOfDateIdentifier(IdentifierInfo &II)
Update an out-of-date identifier.
DeclContext * getEnclosingNamespaceContext()
Retrieve the nearest enclosing namespace context.
Definition: DeclBase.cpp:1765
virtual bool FindExternalVisibleDeclsByName(const DeclContext *DC, DeclarationName Name)
Find all declarations with the given name in the given context, and add them to the context by callin...
Namespaces, declared with &#39;namespace foo {}&#39;.
Definition: DeclBase.h:142
bool isReferenced() const
Whether any declaration of this entity was referenced.
Definition: DeclBase.cpp:423
Forward-declares and imports various common LLVM datatypes that clang wants to use unqualified...
ModuleOwnershipKind getModuleOwnershipKind() const
Get the kind of module ownership for this declaration.
Definition: DeclBase.h:786
StoredDeclsMap * buildLookup()
Ensure the lookup structure is fully-built and return it.
Definition: DeclBase.cpp:1547
static DeclContextLookupResult SetNoExternalVisibleDeclsForName(const DeclContext *DC, DeclarationName Name)
Definition: DeclBase.cpp:1326
ASTContext & getASTContext() const
Definition: Decl.h:94
void eraseDeclAttrs(const Decl *D)
Erase the attributes corresponding to the given declaration.
DeclContext * getLexicalDeclContext()
getLexicalDeclContext - The declaration context where this Decl was lexically declared (LexicalDC)...
Definition: DeclBase.h:828
Labels, declared with &#39;x:&#39; and referenced with &#39;goto x&#39;.
Definition: DeclBase.h:119
void setLocalOwningModule(Module *M)
Definition: DeclBase.h:746
bool isLambdaCallOperator(const CXXMethodDecl *MD)
Definition: ASTLambda.h:27
Represents a linkage specification.
Definition: DeclCXX.h:2778
Ordinary names.
Definition: DeclBase.h:146
virtual Decl * getCanonicalDecl()
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclBase.h:877
void addDeclInternal(Decl *D)
Add the declaration D into this context, but suppress searches for external declarations with the sam...
Definition: DeclBase.cpp:1532
lookup_result lookup(DeclarationName Name) const
lookup - Find the declarations (if any) with the given Name in this context.
Definition: DeclBase.cpp:1612
AvailabilityResult
Captures the result of checking the availability of a declaration.
Definition: DeclBase.h:74
NodeId Parent
Definition: ASTDiff.cpp:191
Decl * getNextDeclInContext()
Definition: DeclBase.h:435
bool canBeWeakImported(bool &IsDefinition) const
Determines whether this symbol can be weak-imported, e.g., whether it would be well-formed to add the...
Definition: DeclBase.cpp:640
udir_range using_directives() const
Returns iterator range [First, Last) of UsingDirectiveDecls stored within this context.
Definition: DeclBase.cpp:1911
AvailabilityResult getAvailability(std::string *Message=nullptr, VersionTuple EnclosingVersion=VersionTuple(), StringRef *RealizedPlatform=nullptr) const
Determine the availability of the given declaration.
Definition: DeclBase.cpp:574
Objective C @protocol.
Definition: DeclBase.h:149
llvm::iterator_range< udir_iterator > udir_range
Definition: DeclBase.h:2314
decl_range noload_decls() const
noload_decls_begin/end - Iterate over the declarations stored in this context that are currently load...
Definition: DeclBase.h:2041
const FunctionType * getFunctionType(bool BlocksToo=true) const
Looks through the Decl&#39;s underlying type to extract a FunctionType when possible. ...
Definition: DeclBase.cpp:954
void removeExternalDecls()
Remove any declarations which were imported from an external AST source.
int64_t getID() const
Definition: DeclBase.cpp:950
bool isInlineNamespace() const
Definition: DeclBase.cpp:1070
DeclContext * getLexicalParent()
getLexicalParent - Returns the containing lexical DeclContext.
Definition: DeclBase.h:1800
Represents a block literal declaration, which is like an unnamed FunctionDecl.
Definition: Decl.h:4037
const Attr * getDefiningAttr() const
Return this declaration&#39;s defining attribute if it has one.
Definition: DeclBase.cpp:460
Defines the clang::LangOptions interface.
QualType getPointeeType() const
Definition: Type.h:2771
std::string Label
static unsigned getIdentifierNamespaceForKind(Kind DK)
Definition: DeclBase.cpp:689
bool containsDecl(Decl *D) const
Checks whether a declaration is in this context.
Definition: DeclBase.cpp:1401
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:7067
#define V(N, I)
Definition: ASTContext.h:2941
bool isFunctionReferenceType() const
Definition: Type.h:6545
void setInvalidDecl(bool Invalid=true)
setInvalidDecl - Indicates the Decl had a semantic error.
Definition: DeclBase.cpp:132
This declaration is an OpenMP user defined reduction construction.
Definition: DeclBase.h:180
bool InEnclosingNamespaceSetOf(const DeclContext *NS) const
Test if this context is part of the enclosing namespace set of the context NS, as defined in C++0x [n...
Definition: DeclBase.cpp:1784
Decl * getMostRecentDecl()
Retrieve the most recent declaration that declares the same entity as this declaration (which may be ...
Definition: DeclBase.h:975
bool isLocalExternDecl()
Determine whether this is a block-scope declaration with linkage.
Definition: DeclBase.h:1060
bool isFileContext() const
Definition: DeclBase.h:1854
DeclContext * getDeclContext()
Definition: DeclBase.h:438
lookup_result noload_lookup(DeclarationName Name)
Find the declarations with the given name that are visible within this context; don&#39;t attempt to retr...
Definition: DeclBase.cpp:1677
Decl * getNonClosureAncestor()
Find the nearest non-closure ancestor of this context, i.e.
Definition: DeclBase.cpp:998
An abstract interface that should be implemented by listeners that want to be notified when an AST en...
bool isTemplateParameter() const
isTemplateParameter - Determines whether this declaration is a template parameter.
Definition: DeclBase.h:2458
bool isTemplateParameterPack() const
isTemplateParameter - Determines whether this declaration is a template parameter pack...
Definition: DeclBase.cpp:201
bool containsDeclAndLoad(Decl *D) const
Checks whether a declaration is in this context.
Definition: DeclBase.cpp:1406
This declaration is an OpenMP user defined mapper.
Definition: DeclBase.h:183
Defines the clang::IdentifierInfo, clang::IdentifierTable, and clang::Selector interfaces.
bool isFunctionOrMethod() const
Definition: DeclBase.h:1836
clang::ObjCRuntime ObjCRuntime
Definition: LangOptions.h:257
This declaration has an owning module, and is visible when that module is imported.
unsigned getMaxAlignment() const
getMaxAlignment - return the maximum alignment specified by attributes on this decl, 0 if there are none.
Definition: DeclBase.cpp:385
DeclContext * getParent()
getParent - Returns the containing DeclContext.
Definition: DeclBase.h:1784
void collectAllContexts(SmallVectorImpl< DeclContext *> &Contexts)
Collects all of the declaration contexts that are semantically connected to this declaration context...
Definition: DeclBase.cpp:1240
SourceLocation getEnd() const
bool isDependentContext() const
Determines whether this context is dependent on a template parameter.
Definition: DeclBase.cpp:1091
The result type of a method or function.
const SourceManager & SM
Definition: Format.cpp:1685
void setDeclContext(DeclContext *DC)
setDeclContext - Set both the semantic and lexical DeclContext to DC.
Definition: DeclBase.cpp:295
SmallVector< Attr *, 4 > AttrVec
AttrVec - A vector of Attr, which is how they are stored on the AST.
Definition: AttrIterator.h:29
FriendObjectKind getFriendObjectKind() const
Determines whether this declaration is the object of a friend declaration and, if so...
Definition: DeclBase.h:1111
virtual void DeclarationMarkedUsed(const Decl *D)
A declaration is marked used which was not previously marked used.
bool decls_empty() const
Definition: DeclBase.cpp:1394
AttrVec & getAttrs()
Definition: DeclBase.h:490
bool hasAttrs() const
Definition: DeclBase.h:484
Abstract interface for external sources of AST nodes.
bool isTemplateDecl() const
returns true if this declaration is a template
Definition: DeclBase.cpp:226
Decl::Kind getDeclKind() const
Definition: DeclBase.h:1777
void makeDeclVisibleInContext(NamedDecl *D)
Makes a declaration visible within this context.
Definition: DeclBase.cpp:1802
DeclContext::lookup_result getLookupResult()
getLookupResult - Return an array of all the decls that this list represents.
FunctionDecl * getAsFunction() LLVM_READONLY
Returns the function itself, or the templated function if this is a function template.
Definition: DeclBase.cpp:218
StringRef getPlatformName() const
Retrieve the name of the platform as it is used in the availability attribute.
Definition: TargetInfo.h:1265
VersionTuple getVersionIntroduced() const
Retrieve the version of the target platform in which this declaration was introduced.
Definition: DeclBase.cpp:626
Encodes a location in the source.
Members, declared with object declarations within tag definitions.
Definition: DeclBase.h:138
void setModuleOwnershipKind(ModuleOwnershipKind MOK)
Set whether this declaration is hidden from name lookup.
Definition: DeclBase.h:791
decl_iterator decls_begin() const
Definition: DeclBase.cpp:1388
Represents the declaration of a struct/union/class/enum.
Definition: Decl.h:3219
ASTContext & getASTContext() const LLVM_READONLY
Definition: DeclBase.cpp:377
bool isStdNamespace() const
Definition: DeclBase.cpp:1075
This file defines OpenMP nodes for declarative directives.
void print(raw_ostream &OS) const override
Definition: DeclBase.cpp:268
DeclContext(Decl::Kind K)
Definition: DeclBase.cpp:1006
bool isFromASTFile() const
Determine whether this declaration came from an AST file (such as a precompiled header or module) rat...
Definition: DeclBase.h:702
UsingDirectiveDecl * operator*() const
Definition: DeclBase.cpp:1905
bool isUsed(bool CheckUsedAttr=true) const
Whether any (re-)declaration of the entity was used, meaning that a definition is required...
Definition: DeclBase.cpp:398
An array of decls optimized for the common case of only containing one entry.
void dropAttrs()
Definition: DeclBase.cpp:825
bool isWeakImported() const
Determine whether this is a weak-imported symbol.
Definition: DeclBase.cpp:670
void * Allocate(size_t Size, unsigned Align=8) const
Definition: ASTContext.h:686
decl_iterator - Iterates through the declarations stored within this context.
Definition: DeclBase.h:1990
redecl_range redecls() const
Returns an iterator range for all the redeclarations of the same decl.
Definition: DeclBase.h:948
Dataflow Directional Tag Classes.
void updateOutOfDate(IdentifierInfo &II) const
Update a potentially out-of-date declaration.
Definition: DeclBase.cpp:63
bool isValid() const
Return true if this is a valid SourceLocation object.
virtual Module * getModule(unsigned ID)
Retrieve the module that corresponds to the given module ID.
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1271
The base class of all kinds of template declarations (e.g., class, function, etc.).
Definition: DeclTemplate.h:402
bool isRecord() const
Definition: DeclBase.h:1863
attr_range attrs() const
Definition: DeclBase.h:501
RecordDecl * getOuterLexicalRecordContext()
Retrieve the outermost lexically enclosing record context.
Definition: DeclBase.cpp:1773
The name of a declaration.
Kind getKind() const
Definition: DeclBase.h:432
Decl * getNonClosureContext()
Find the innermost non-closure ancestor of this declaration, walking up through blocks, lambdas, etc.
Definition: DeclBase.cpp:994
Tags, declared with &#39;struct foo;&#39; and referenced with &#39;struct foo&#39;.
Definition: DeclBase.h:127
llvm::BumpPtrAllocator & getAllocator() const
Definition: ASTContext.h:682
ExternalASTSource * getExternalSource() const
Retrieve a pointer to the external AST source associated with this AST context, if any...
Definition: ASTContext.h:1086
A dependently-generated diagnostic.
Pointer to a block type.
Definition: Type.h:2716
static DependentDiagnostic * Create(ASTContext &Context, DeclContext *Parent, AccessNonce _, SourceLocation Loc, bool IsMemberAccess, AccessSpecifier AS, NamedDecl *TargetDecl, CXXRecordDecl *NamingClass, QualType BaseObjectType, const PartialDiagnostic &PDiag)
void setIsUsed()
Set whether the declaration is used, in the sense of odr-use.
Definition: DeclBase.h:573
LanguageIDs
Represents the language in a linkage specification.
Definition: DeclCXX.h:2787
T * getAttr() const
Definition: DeclBase.h:538
unsigned getOwningModuleID() const
Retrieve the global ID of the module that owns this particular declaration.
Definition: DeclBase.h:714
virtual ~Decl()
void setOnlyValue(NamedDecl *ND)
Base for LValueReferenceType and RValueReferenceType.
Definition: Type.h:2750
DeclContext * getRedeclContext()
getRedeclContext - Retrieve the context in which an entity conflicts with other entities of the same ...
Definition: DeclBase.cpp:1747
const LinkageSpecDecl * getExternCContext() const
Retrieve the nearest enclosing C linkage specification context.
Definition: DeclBase.cpp:1146
void addDecl(Decl *D)
Add the declaration D into this context.
Definition: DeclBase.cpp:1524
Implements a partial diagnostic that can be emitted anwyhere in a DiagnosticBuilder stream...
void markUsed(ASTContext &C)
Mark the declaration used, in the sense of odr-use.
Definition: DeclBase.cpp:413
ASTMutationListener * getASTMutationListener() const
Retrieve a pointer to the AST mutation listener associated with this AST context, if any...
Definition: ASTContext.h:1101
Defines the C++ Decl subclasses, other than those for templates (found in DeclTemplate.h) and friends (in DeclFriend.h).
Defines the clang::SourceLocation class and associated facilities.
DeclContextLookupResult lookup_result
Definition: DeclBase.h:2237
void addHiddenDecl(Decl *D)
Add the declaration D to this context without modifying any lookup tables.
Definition: DeclBase.cpp:1498
static std::pair< Decl *, Decl * > BuildDeclChain(ArrayRef< Decl *> Decls, bool FieldsAlreadyLoaded)
Build up a chain of declarations.
Definition: DeclBase.cpp:1257
bool isInherited() const
Definition: Attr.h:94
DeclContext * getLookupParent()
Find the parent context of this context that will be used for unqualified name lookup.
Definition: DeclBase.cpp:1042
void addAttr(Attr *A)
Definition: DeclBase.cpp:832
static bool classof(const Decl *D)
Definition: DeclBase.cpp:1016
Defines the clang::TargetInfo interface.
ASTContext & getParentASTContext() const
Definition: DeclBase.h:1813
SourceRange getSourceRange() const override LLVM_READONLY
Source range that this declaration covers.
Definition: Decl.cpp:3868
Kind
Lists the kind of concrete classes of Decl.
Definition: DeclBase.h:91
The top declaration context.
Definition: Decl.h:82
static void DestroyAll(StoredDeclsMap *Map, bool Dependent)
Definition: DeclBase.cpp:1946
static void PrintStats()
Definition: DeclBase.cpp:169
NamedDecl * getMostRecentDecl()
Definition: Decl.h:428
DeclContext * getPrimaryContext()
getPrimaryContext - There may be many different declarations of the same entity (including forward de...
Definition: DeclBase.cpp:1171
bool trackLocalOwningModule() const
Do we need to track the owning module for a local declaration?
Definition: LangOptions.h:318
static void EnableStatistics()
Definition: DeclBase.cpp:165
void setLexicalDeclContext(DeclContext *DC)
Definition: DeclBase.cpp:299
This represents a decl that may have a name.
Definition: Decl.h:223
bool isTranslationUnit() const
Definition: DeclBase.h:1859
void setAccess(AccessSpecifier AS)
Definition: DeclBase.h:468
TemplateDecl * getDescribedTemplate() const
If this is a declaration that describes some template, this method returns that template declaration...
Definition: DeclBase.cpp:230
Represents C++ using-directive.
Definition: DeclCXX.h:2863
bool hasDefiningAttr() const
Return true if this declaration has an attribute which acts as definition of the entity, such as &#39;alias&#39; or &#39;ifunc&#39;.
Definition: DeclBase.cpp:456
bool isFunctionPointerType() const
Definition: Type.h:6538
void addedLocalImportDecl(ImportDecl *Import)
Notify the AST context that a new import declaration has been parsed or implicitly created within thi...
bool isInStdNamespace() const
Definition: DeclBase.cpp:357
TranslationUnitDecl * getTranslationUnitDecl()
Definition: DeclBase.cpp:362
const LangOptions & getLangOpts() const
Definition: ASTContext.h:724
const BlockDecl * getInnermostBlockDecl() const
Return this DeclContext if it is a BlockDecl.
Definition: DeclBase.cpp:1058
bool isExternCXXContext() const
Determines whether this context or some of its ancestors is a linkage specification context that spec...
Definition: DeclBase.cpp:1157
bool isTemplated() const
Determine whether this declaration is a templated entity (whether it is.
Definition: DeclBase.cpp:243
SourceLocation getBodyRBrace() const
getBodyRBrace - Gets the right brace of the body, if a body exists.
Definition: DeclBase.cpp:898
Attr - This represents one attribute.
Definition: Attr.h:45
static AvailabilityResult CheckAvailability(ASTContext &Context, const AvailabilityAttr *A, std::string *Message, VersionTuple EnclosingVersion)
Determine the availability of the given declaration based on the target platform. ...
Definition: DeclBase.cpp:490
bool isBeingDefined() const
Return true if this decl is currently being defined.
Definition: Decl.h:3344
This declaration is a using declaration.
Definition: DeclBase.h:165
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