clang 8.0.0

SemaStmtAsm.cpp
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1 //===--- SemaStmtAsm.cpp - Semantic Analysis for Asm Statements -----------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements semantic analysis for inline asm statements.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "clang/AST/ExprCXX.h"
15 #include "clang/AST/RecordLayout.h"
16 #include "clang/AST/TypeLoc.h"
17 #include "clang/Basic/TargetInfo.h"
18 #include "clang/Lex/Preprocessor.h"
19 #include "clang/Sema/Initialization.h"
20 #include "clang/Sema/Lookup.h"
21 #include "clang/Sema/Scope.h"
22 #include "clang/Sema/ScopeInfo.h"
23 #include "clang/Sema/SemaInternal.h"
24 #include "llvm/ADT/ArrayRef.h"
25 #include "llvm/ADT/StringSet.h"
26 #include "llvm/MC/MCParser/MCAsmParser.h"
27 using namespace clang;
28 using namespace sema;
29
30 /// Remove the upper-level LValueToRValue cast from an expression.
31 static void removeLValueToRValueCast(Expr *E) {
32 Expr *Parent = E;
33 Expr *ExprUnderCast = nullptr;
34 SmallVector<Expr *, 8> ParentsToUpdate;
35
36 while (true) {
37 ParentsToUpdate.push_back(Parent);
38 if (auto *ParenE = dyn_cast<ParenExpr>(Parent)) {
39 Parent = ParenE->getSubExpr();
40 continue;
41 }
42
43 Expr *Child = nullptr;
44 CastExpr *ParentCast = dyn_cast<CastExpr>(Parent);
45 if (ParentCast)
46 Child = ParentCast->getSubExpr();
47 else
48 return;
49
50 if (auto *CastE = dyn_cast<CastExpr>(Child))
51 if (CastE->getCastKind() == CK_LValueToRValue) {
52 ExprUnderCast = CastE->getSubExpr();
53 // LValueToRValue cast inside GCCAsmStmt requires an explicit cast.
54 ParentCast->setSubExpr(ExprUnderCast);
55 break;
56 }
57 Parent = Child;
58 }
59
60 // Update parent expressions to have same ValueType as the underlying.
61 assert(ExprUnderCast &&
62 "Should be reachable only if LValueToRValue cast was found!");
63 auto ValueKind = ExprUnderCast->getValueKind();
64 for (Expr *E : ParentsToUpdate)
65 E->setValueKind(ValueKind);
66 }
67
68 /// Emit a warning about usage of "noop"-like casts for lvalues (GNU extension)
69 /// and fix the argument with removing LValueToRValue cast from the expression.
70 static void emitAndFixInvalidAsmCastLValue(const Expr *LVal, Expr *BadArgument,
71 Sema &S) {
72 if (!S.getLangOpts().HeinousExtensions) {
73 S.Diag(LVal->getBeginLoc(), diag::err_invalid_asm_cast_lvalue)
74 << BadArgument->getSourceRange();
75 } else {
76 S.Diag(LVal->getBeginLoc(), diag::warn_invalid_asm_cast_lvalue)
77 << BadArgument->getSourceRange();
78 }
79 removeLValueToRValueCast(BadArgument);
80 }
81
82 /// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently
83 /// ignore "noop" casts in places where an lvalue is required by an inline asm.
84 /// We emulate this behavior when -fheinous-gnu-extensions is specified, but
85 /// provide a strong guidance to not use it.
86 ///
87 /// This method checks to see if the argument is an acceptable l-value and
88 /// returns false if it is a case we can handle.
89 static bool CheckAsmLValue(Expr *E, Sema &S) {
90 // Type dependent expressions will be checked during instantiation.
91 if (E->isTypeDependent())
92 return false;
93
94 if (E->isLValue())
95 return false; // Cool, this is an lvalue.
96
97 // Okay, this is not an lvalue, but perhaps it is the result of a cast that we
98 // are supposed to allow.
99 const Expr *E2 = E->IgnoreParenNoopCasts(S.Context);
100 if (E != E2 && E2->isLValue()) {
101 emitAndFixInvalidAsmCastLValue(E2, E, S);
102 // Accept, even if we emitted an error diagnostic.
103 return false;
104 }
105
106 // None of the above, just randomly invalid non-lvalue.
107 return true;
108 }
109
110 /// isOperandMentioned - Return true if the specified operand # is mentioned
111 /// anywhere in the decomposed asm string.
112 static bool
113 isOperandMentioned(unsigned OpNo,
114 ArrayRef<GCCAsmStmt::AsmStringPiece> AsmStrPieces) {
115 for (unsigned p = 0, e = AsmStrPieces.size(); p != e; ++p) {
116 const GCCAsmStmt::AsmStringPiece &Piece = AsmStrPieces[p];
117 if (!Piece.isOperand())
118 continue;
119
120 // If this is a reference to the input and if the input was the smaller
121 // one, then we have to reject this asm.
122 if (Piece.getOperandNo() == OpNo)
123 return true;
124 }
125 return false;
126 }
127
128 static bool CheckNakedParmReference(Expr *E, Sema &S) {
129 FunctionDecl *Func = dyn_cast<FunctionDecl>(S.CurContext);
130 if (!Func)
131 return false;
132 if (!Func->hasAttr<NakedAttr>())
133 return false;
134
135 SmallVector<Expr*, 4> WorkList;
136 WorkList.push_back(E);
137 while (WorkList.size()) {
138 Expr *E = WorkList.pop_back_val();
139 if (isa<CXXThisExpr>(E)) {
140 S.Diag(E->getBeginLoc(), diag::err_asm_naked_this_ref);
141 S.Diag(Func->getAttr<NakedAttr>()->getLocation(), diag::note_attribute);
142 return true;
143 }
144 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
145 if (isa<ParmVarDecl>(DRE->getDecl())) {
146 S.Diag(DRE->getBeginLoc(), diag::err_asm_naked_parm_ref);
147 S.Diag(Func->getAttr<NakedAttr>()->getLocation(), diag::note_attribute);
148 return true;
149 }
150 }
151 for (Stmt *Child : E->children()) {
152 if (Expr *E = dyn_cast_or_null<Expr>(Child))
153 WorkList.push_back(E);
154 }
155 }
156 return false;
157 }
158
159 /// Returns true if given expression is not compatible with inline
160 /// assembly's memory constraint; false otherwise.
161 static bool checkExprMemoryConstraintCompat(Sema &S, Expr *E,
162 TargetInfo::ConstraintInfo &Info,
163 bool is_input_expr) {
164 enum {
165 ExprBitfield = 0,
166 ExprVectorElt,
167 ExprGlobalRegVar,
168 ExprSafeType
169 } EType = ExprSafeType;
170
171 // Bitfields, vector elements and global register variables are not
172 // compatible.
173 if (E->refersToBitField())
174 EType = ExprBitfield;
175 else if (E->refersToVectorElement())
176 EType = ExprVectorElt;
177 else if (E->refersToGlobalRegisterVar())
178 EType = ExprGlobalRegVar;
179
180 if (EType != ExprSafeType) {
181 S.Diag(E->getBeginLoc(), diag::err_asm_non_addr_value_in_memory_constraint)
182 << EType << is_input_expr << Info.getConstraintStr()
183 << E->getSourceRange();
184 return true;
185 }
186
187 return false;
188 }
189
190 // Extracting the register name from the Expression value,
191 // if there is no register name to extract, returns ""
192 static StringRef extractRegisterName(const Expr *Expression,
193 const TargetInfo &Target) {
194 Expression = Expression->IgnoreImpCasts();
195 if (const DeclRefExpr *AsmDeclRef = dyn_cast<DeclRefExpr>(Expression)) {
196 // Handle cases where the expression is a variable
197 const VarDecl *Variable = dyn_cast<VarDecl>(AsmDeclRef->getDecl());
198 if (Variable && Variable->getStorageClass() == SC_Register) {
199 if (AsmLabelAttr *Attr = Variable->getAttr<AsmLabelAttr>())
200 if (Target.isValidGCCRegisterName(Attr->getLabel()))
201 return Target.getNormalizedGCCRegisterName(Attr->getLabel(), true);
202 }
203 }
204 return "";
205 }
206
207 // Checks if there is a conflict between the input and output lists with the
208 // clobbers list. If there's a conflict, returns the location of the
209 // conflicted clobber, else returns nullptr
210 static SourceLocation
211 getClobberConflictLocation(MultiExprArg Exprs, StringLiteral **Constraints,
212 StringLiteral **Clobbers, int NumClobbers,
213 const TargetInfo &Target, ASTContext &Cont) {
214 llvm::StringSet<> InOutVars;
215 // Collect all the input and output registers from the extended asm
216 // statement in order to check for conflicts with the clobber list
217 for (unsigned int i = 0; i < Exprs.size(); ++i) {
218 StringRef Constraint = Constraints[i]->getString();
219 StringRef InOutReg = Target.getConstraintRegister(
220 Constraint, extractRegisterName(Exprs[i], Target));
221 if (InOutReg != "")
222 InOutVars.insert(InOutReg);
223 }
224 // Check for each item in the clobber list if it conflicts with the input
225 // or output
226 for (int i = 0; i < NumClobbers; ++i) {
227 StringRef Clobber = Clobbers[i]->getString();
228 // We only check registers, therefore we don't check cc and memory
229 // clobbers
230 if (Clobber == "cc" || Clobber == "memory")
231 continue;
232 Clobber = Target.getNormalizedGCCRegisterName(Clobber, true);
233 // Go over the output's registers we collected
234 if (InOutVars.count(Clobber))
235 return Clobbers[i]->getBeginLoc();
236 }
237 return SourceLocation();
238 }
239
240 StmtResult Sema::ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
241 bool IsVolatile, unsigned NumOutputs,
242 unsigned NumInputs, IdentifierInfo **Names,
243 MultiExprArg constraints, MultiExprArg Exprs,
244 Expr *asmString, MultiExprArg clobbers,
245 SourceLocation RParenLoc) {
246 unsigned NumClobbers = clobbers.size();
247 StringLiteral **Constraints =
248 reinterpret_cast<StringLiteral**>(constraints.data());
249 StringLiteral *AsmString = cast<StringLiteral>(asmString);
250 StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.data());
251
252 SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos;
253
254 // The parser verifies that there is a string literal here.
255 assert(AsmString->isAscii());
256
257 // If we're compiling CUDA file and function attributes indicate that it's not
258 // for this compilation side, skip all the checks.
259 if (!DeclAttrsMatchCUDAMode(getLangOpts(), getCurFunctionDecl())) {
260 GCCAsmStmt *NS = new (Context) GCCAsmStmt(
261 Context, AsmLoc, IsSimple, IsVolatile, NumOutputs, NumInputs, Names,
262 Constraints, Exprs.data(), AsmString, NumClobbers, Clobbers, RParenLoc);
263 return NS;
264 }
265
266 for (unsigned i = 0; i != NumOutputs; i++) {
267 StringLiteral *Literal = Constraints[i];
268 assert(Literal->isAscii());
269
270 StringRef OutputName;
271 if (Names[i])
272 OutputName = Names[i]->getName();
273
274 TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName);
275 if (!Context.getTargetInfo().validateOutputConstraint(Info))
276 return StmtError(
277 Diag(Literal->getBeginLoc(), diag::err_asm_invalid_output_constraint)
278 << Info.getConstraintStr());
279
280 ExprResult ER = CheckPlaceholderExpr(Exprs[i]);
281 if (ER.isInvalid())
282 return StmtError();
283 Exprs[i] = ER.get();
284
285 // Check that the output exprs are valid lvalues.
286 Expr *OutputExpr = Exprs[i];
287
288 // Referring to parameters is not allowed in naked functions.
289 if (CheckNakedParmReference(OutputExpr, *this))
290 return StmtError();
291
292 // Check that the output expression is compatible with memory constraint.
293 if (Info.allowsMemory() &&
294 checkExprMemoryConstraintCompat(*this, OutputExpr, Info, false))
295 return StmtError();
296
297 OutputConstraintInfos.push_back(Info);
298
299 // If this is dependent, just continue.
300 if (OutputExpr->isTypeDependent())
301 continue;
302
303 Expr::isModifiableLvalueResult IsLV =
304 OutputExpr->isModifiableLvalue(Context, /*Loc=*/nullptr);
305 switch (IsLV) {
306 case Expr::MLV_Valid:
307 // Cool, this is an lvalue.
308 break;
309 case Expr::MLV_ArrayType:
310 // This is OK too.
311 break;
312 case Expr::MLV_LValueCast: {
313 const Expr *LVal = OutputExpr->IgnoreParenNoopCasts(Context);
314 emitAndFixInvalidAsmCastLValue(LVal, OutputExpr, *this);
315 // Accept, even if we emitted an error diagnostic.
316 break;
317 }
318 case Expr::MLV_IncompleteType:
319 case Expr::MLV_IncompleteVoidType:
320 if (RequireCompleteType(OutputExpr->getBeginLoc(), Exprs[i]->getType(),
321 diag::err_dereference_incomplete_type))
322 return StmtError();
323 LLVM_FALLTHROUGH;
324 default:
325 return StmtError(Diag(OutputExpr->getBeginLoc(),
326 diag::err_asm_invalid_lvalue_in_output)
327 << OutputExpr->getSourceRange());
328 }
329
330 unsigned Size = Context.getTypeSize(OutputExpr->getType());
331 if (!Context.getTargetInfo().validateOutputSize(Literal->getString(),
332 Size))
333 return StmtError(
334 Diag(OutputExpr->getBeginLoc(), diag::err_asm_invalid_output_size)
335 << Info.getConstraintStr());
336 }
337
338 SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos;
339
340 for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) {
341 StringLiteral *Literal = Constraints[i];
342 assert(Literal->isAscii());
343
344 StringRef InputName;
345 if (Names[i])
346 InputName = Names[i]->getName();
347
348 TargetInfo::ConstraintInfo Info(Literal->getString(), InputName);
349 if (!Context.getTargetInfo().validateInputConstraint(OutputConstraintInfos,
350 Info)) {
351 return StmtError(
352 Diag(Literal->getBeginLoc(), diag::err_asm_invalid_input_constraint)
353 << Info.getConstraintStr());
354 }
355
356 ExprResult ER = CheckPlaceholderExpr(Exprs[i]);
357 if (ER.isInvalid())
358 return StmtError();
359 Exprs[i] = ER.get();
360
361 Expr *InputExpr = Exprs[i];
362
363 // Referring to parameters is not allowed in naked functions.
364 if (CheckNakedParmReference(InputExpr, *this))
365 return StmtError();
366
367 // Check that the input expression is compatible with memory constraint.
368 if (Info.allowsMemory() &&
369 checkExprMemoryConstraintCompat(*this, InputExpr, Info, true))
370 return StmtError();
371
372 // Only allow void types for memory constraints.
373 if (Info.allowsMemory() && !Info.allowsRegister()) {
374 if (CheckAsmLValue(InputExpr, *this))
375 return StmtError(Diag(InputExpr->getBeginLoc(),
376 diag::err_asm_invalid_lvalue_in_input)
377 << Info.getConstraintStr()
378 << InputExpr->getSourceRange());
379 } else if (Info.requiresImmediateConstant() && !Info.allowsRegister()) {
380 if (!InputExpr->isValueDependent()) {
381 Expr::EvalResult EVResult;
382 if (!InputExpr->EvaluateAsRValue(EVResult, Context, true))
383 return StmtError(
384 Diag(InputExpr->getBeginLoc(), diag::err_asm_immediate_expected)
385 << Info.getConstraintStr() << InputExpr->getSourceRange());
386 llvm::APSInt Result = EVResult.Val.getInt();
387 if (!Info.isValidAsmImmediate(Result))
388 return StmtError(Diag(InputExpr->getBeginLoc(),
389 diag::err_invalid_asm_value_for_constraint)
390 << Result.toString(10) << Info.getConstraintStr()
391 << InputExpr->getSourceRange());
392 }
393
394 } else {
395 ExprResult Result = DefaultFunctionArrayLvalueConversion(Exprs[i]);
396 if (Result.isInvalid())
397 return StmtError();
398
399 Exprs[i] = Result.get();
400 }
401
402 if (Info.allowsRegister()) {
403 if (InputExpr->getType()->isVoidType()) {
404 return StmtError(
405 Diag(InputExpr->getBeginLoc(), diag::err_asm_invalid_type_in_input)
406 << InputExpr->getType() << Info.getConstraintStr()
407 << InputExpr->getSourceRange());
408 }
409 }
410
411 InputConstraintInfos.push_back(Info);
412
413 const Type *Ty = Exprs[i]->getType().getTypePtr();
414 if (Ty->isDependentType())
415 continue;
416
417 if (!Ty->isVoidType() || !Info.allowsMemory())
418 if (RequireCompleteType(InputExpr->getBeginLoc(), Exprs[i]->getType(),
419 diag::err_dereference_incomplete_type))
420 return StmtError();
421
422 unsigned Size = Context.getTypeSize(Ty);
423 if (!Context.getTargetInfo().validateInputSize(Literal->getString(),
424 Size))
425 return StmtError(
426 Diag(InputExpr->getBeginLoc(), diag::err_asm_invalid_input_size)
427 << Info.getConstraintStr());
428 }
429
430 // Check that the clobbers are valid.
431 for (unsigned i = 0; i != NumClobbers; i++) {
432 StringLiteral *Literal = Clobbers[i];
433 assert(Literal->isAscii());
434
435 StringRef Clobber = Literal->getString();
436
437 if (!Context.getTargetInfo().isValidClobber(Clobber))
438 return StmtError(
439 Diag(Literal->getBeginLoc(), diag::err_asm_unknown_register_name)
440 << Clobber);
441 }
442
443 GCCAsmStmt *NS =
444 new (Context) GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
445 NumInputs, Names, Constraints, Exprs.data(),
446 AsmString, NumClobbers, Clobbers, RParenLoc);
447 // Validate the asm string, ensuring it makes sense given the operands we
448 // have.
449 SmallVector<GCCAsmStmt::AsmStringPiece, 8> Pieces;
450 unsigned DiagOffs;
451 if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) {
452 Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID)
453 << AsmString->getSourceRange();
454 return StmtError();
455 }
456
457 // Validate constraints and modifiers.
458 for (unsigned i = 0, e = Pieces.size(); i != e; ++i) {
459 GCCAsmStmt::AsmStringPiece &Piece = Pieces[i];
460 if (!Piece.isOperand()) continue;
461
462 // Look for the correct constraint index.
463 unsigned ConstraintIdx = Piece.getOperandNo();
464 unsigned NumOperands = NS->getNumOutputs() + NS->getNumInputs();
465
466 // Look for the (ConstraintIdx - NumOperands + 1)th constraint with
467 // modifier '+'.
468 if (ConstraintIdx >= NumOperands) {
469 unsigned I = 0, E = NS->getNumOutputs();
470
471 for (unsigned Cnt = ConstraintIdx - NumOperands; I != E; ++I)
472 if (OutputConstraintInfos[I].isReadWrite() && Cnt-- == 0) {
473 ConstraintIdx = I;
474 break;
475 }
476
477 assert(I != E && "Invalid operand number should have been caught in "
478 " AnalyzeAsmString");
479 }
480
481 // Now that we have the right indexes go ahead and check.
482 StringLiteral *Literal = Constraints[ConstraintIdx];
483 const Type *Ty = Exprs[ConstraintIdx]->getType().getTypePtr();
484 if (Ty->isDependentType() || Ty->isIncompleteType())
485 continue;
486
487 unsigned Size = Context.getTypeSize(Ty);
488 std::string SuggestedModifier;
489 if (!Context.getTargetInfo().validateConstraintModifier(
490 Literal->getString(), Piece.getModifier(), Size,
491 SuggestedModifier)) {
492 Diag(Exprs[ConstraintIdx]->getBeginLoc(),
493 diag::warn_asm_mismatched_size_modifier);
494
495 if (!SuggestedModifier.empty()) {
496 auto B = Diag(Piece.getRange().getBegin(),
497 diag::note_asm_missing_constraint_modifier)
498 << SuggestedModifier;
499 SuggestedModifier = "%" + SuggestedModifier + Piece.getString();
500 B.AddFixItHint(FixItHint::CreateReplacement(Piece.getRange(),
501 SuggestedModifier));
502 }
503 }
504 }
505
506 // Validate tied input operands for type mismatches.
507 unsigned NumAlternatives = ~0U;
508 for (unsigned i = 0, e = OutputConstraintInfos.size(); i != e; ++i) {
509 TargetInfo::ConstraintInfo &Info = OutputConstraintInfos[i];
510 StringRef ConstraintStr = Info.getConstraintStr();
511 unsigned AltCount = ConstraintStr.count(',') + 1;
512 if (NumAlternatives == ~0U)
513 NumAlternatives = AltCount;
514 else if (NumAlternatives != AltCount)
515 return StmtError(Diag(NS->getOutputExpr(i)->getBeginLoc(),
516 diag::err_asm_unexpected_constraint_alternatives)
517 << NumAlternatives << AltCount);
518 }
519 SmallVector<size_t, 4> InputMatchedToOutput(OutputConstraintInfos.size(),
520 ~0U);
521 for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) {
522 TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i];
523 StringRef ConstraintStr = Info.getConstraintStr();
524 unsigned AltCount = ConstraintStr.count(',') + 1;
525 if (NumAlternatives == ~0U)
526 NumAlternatives = AltCount;
527 else if (NumAlternatives != AltCount)
528 return StmtError(Diag(NS->getInputExpr(i)->getBeginLoc(),
529 diag::err_asm_unexpected_constraint_alternatives)
530 << NumAlternatives << AltCount);
531
532 // If this is a tied constraint, verify that the output and input have
533 // either exactly the same type, or that they are int/ptr operands with the
534 // same size (int/long, int*/long, are ok etc).
535 if (!Info.hasTiedOperand()) continue;
536
537 unsigned TiedTo = Info.getTiedOperand();
538 unsigned InputOpNo = i+NumOutputs;
539 Expr *OutputExpr = Exprs[TiedTo];
540 Expr *InputExpr = Exprs[InputOpNo];
541
542 // Make sure no more than one input constraint matches each output.
543 assert(TiedTo < InputMatchedToOutput.size() && "TiedTo value out of range");
544 if (InputMatchedToOutput[TiedTo] != ~0U) {
545 Diag(NS->getInputExpr(i)->getBeginLoc(),
546 diag::err_asm_input_duplicate_match)
547 << TiedTo;
548 Diag(NS->getInputExpr(InputMatchedToOutput[TiedTo])->getBeginLoc(),
549 diag::note_asm_input_duplicate_first)
550 << TiedTo;
551 return StmtError();
552 }
553 InputMatchedToOutput[TiedTo] = i;
554
555 if (OutputExpr->isTypeDependent() || InputExpr->isTypeDependent())
556 continue;
557
558 QualType InTy = InputExpr->getType();
559 QualType OutTy = OutputExpr->getType();
560 if (Context.hasSameType(InTy, OutTy))
561 continue; // All types can be tied to themselves.
562
563 // Decide if the input and output are in the same domain (integer/ptr or
564 // floating point.
565 enum AsmDomain {
566 AD_Int, AD_FP, AD_Other
567 } InputDomain, OutputDomain;
568
569 if (InTy->isIntegerType() || InTy->isPointerType())
570 InputDomain = AD_Int;
571 else if (InTy->isRealFloatingType())
572 InputDomain = AD_FP;
573 else
574 InputDomain = AD_Other;
575
576 if (OutTy->isIntegerType() || OutTy->isPointerType())
577 OutputDomain = AD_Int;
578 else if (OutTy->isRealFloatingType())
579 OutputDomain = AD_FP;
580 else
581 OutputDomain = AD_Other;
582
583 // They are ok if they are the same size and in the same domain. This
584 // allows tying things like:
585 // void* to int*
586 // void* to int if they are the same size.
587 // double to long double if they are the same size.
588 //
589 uint64_t OutSize = Context.getTypeSize(OutTy);
590 uint64_t InSize = Context.getTypeSize(InTy);
591 if (OutSize == InSize && InputDomain == OutputDomain &&
592 InputDomain != AD_Other)
593 continue;
594
595 // If the smaller input/output operand is not mentioned in the asm string,
596 // then we can promote the smaller one to a larger input and the asm string
597 // won't notice.
598 bool SmallerValueMentioned = false;
599
600 // If this is a reference to the input and if the input was the smaller
601 // one, then we have to reject this asm.
602 if (isOperandMentioned(InputOpNo, Pieces)) {
603 // This is a use in the asm string of the smaller operand. Since we
604 // codegen this by promoting to a wider value, the asm will get printed
605 // "wrong".
606 SmallerValueMentioned |= InSize < OutSize;
607 }
608 if (isOperandMentioned(TiedTo, Pieces)) {
609 // If this is a reference to the output, and if the output is the larger
610 // value, then it's ok because we'll promote the input to the larger type.
611 SmallerValueMentioned |= OutSize < InSize;
612 }
613
614 // If the smaller value wasn't mentioned in the asm string, and if the
615 // output was a register, just extend the shorter one to the size of the
616 // larger one.
617 if (!SmallerValueMentioned && InputDomain != AD_Other &&
618 OutputConstraintInfos[TiedTo].allowsRegister())
619 continue;
620
621 // Either both of the operands were mentioned or the smaller one was
622 // mentioned. One more special case that we'll allow: if the tied input is
623 // integer, unmentioned, and is a constant, then we'll allow truncating it
624 // down to the size of the destination.
625 if (InputDomain == AD_Int && OutputDomain == AD_Int &&
626 !isOperandMentioned(InputOpNo, Pieces) &&
627 InputExpr->isEvaluatable(Context)) {
628 CastKind castKind =
629 (OutTy->isBooleanType() ? CK_IntegralToBoolean : CK_IntegralCast);
630 InputExpr = ImpCastExprToType(InputExpr, OutTy, castKind).get();
631 Exprs[InputOpNo] = InputExpr;
632 NS->setInputExpr(i, InputExpr);
633 continue;
634 }
635
636 Diag(InputExpr->getBeginLoc(), diag::err_asm_tying_incompatible_types)
637 << InTy << OutTy << OutputExpr->getSourceRange()
638 << InputExpr->getSourceRange();
639 return StmtError();
640 }
641
642 // Check for conflicts between clobber list and input or output lists
643 SourceLocation ConstraintLoc =
644 getClobberConflictLocation(Exprs, Constraints, Clobbers, NumClobbers,
645 Context.getTargetInfo(), Context);
646 if (ConstraintLoc.isValid())
647 return Diag(ConstraintLoc, diag::error_inoutput_conflict_with_clobber);
648
649 return NS;
650 }
651
652 void Sema::FillInlineAsmIdentifierInfo(Expr *Res,
653 llvm::InlineAsmIdentifierInfo &Info) {
654 QualType T = Res->getType();
655 Expr::EvalResult Eval;
656 if (T->isFunctionType() || T->isDependentType())
657 return Info.setLabel(Res);
658 if (Res->isRValue()) {
659 if (isa<clang::EnumType>(T) && Res->EvaluateAsRValue(Eval, Context))
660 return Info.setEnum(Eval.Val.getInt().getSExtValue());
661 return Info.setLabel(Res);
662 }
663 unsigned Size = Context.getTypeSizeInChars(T).getQuantity();
664 unsigned Type = Size;
665 if (const auto *ATy = Context.getAsArrayType(T))
666 Type = Context.getTypeSizeInChars(ATy->getElementType()).getQuantity();
667 bool IsGlobalLV = false;
668 if (Res->EvaluateAsLValue(Eval, Context))
669 IsGlobalLV = Eval.isGlobalLValue();
670 Info.setVar(Res, IsGlobalLV, Size, Type);
671 }
672
673 ExprResult Sema::LookupInlineAsmIdentifier(CXXScopeSpec &SS,
674 SourceLocation TemplateKWLoc,
675 UnqualifiedId &Id,
676 bool IsUnevaluatedContext) {
677
678 if (IsUnevaluatedContext)
679 PushExpressionEvaluationContext(
680 ExpressionEvaluationContext::UnevaluatedAbstract,
681 ReuseLambdaContextDecl);
682
683 ExprResult Result = ActOnIdExpression(getCurScope(), SS, TemplateKWLoc, Id,
684 /*trailing lparen*/ false,
685 /*is & operand*/ false,
686 /*CorrectionCandidateCallback=*/nullptr,
687 /*IsInlineAsmIdentifier=*/ true);
688
689 if (IsUnevaluatedContext)
690 PopExpressionEvaluationContext();
691
692 if (!Result.isUsable()) return Result;
693
694 Result = CheckPlaceholderExpr(Result.get());
695 if (!Result.isUsable()) return Result;
696
697 // Referring to parameters is not allowed in naked functions.
698 if (CheckNakedParmReference(Result.get(), *this))
699 return ExprError();
700
701 QualType T = Result.get()->getType();
702
703 if (T->isDependentType()) {
704 return Result;
705 }
706
707 // Any sort of function type is fine.
708 if (T->isFunctionType()) {
709 return Result;
710 }
711
712 // Otherwise, it needs to be a complete type.
713 if (RequireCompleteExprType(Result.get(), diag::err_asm_incomplete_type)) {
714 return ExprError();
715 }
716
717 return Result;
718 }
719
720 bool Sema::LookupInlineAsmField(StringRef Base, StringRef Member,
721 unsigned &Offset, SourceLocation AsmLoc) {
722 Offset = 0;
723 SmallVector<StringRef, 2> Members;
724 Member.split(Members, ".");
725
726 NamedDecl *FoundDecl = nullptr;
727
728 // MS InlineAsm uses 'this' as a base
729 if (getLangOpts().CPlusPlus && Base.equals("this")) {
730 if (const Type *PT = getCurrentThisType().getTypePtrOrNull())
731 FoundDecl = PT->getPointeeType()->getAsTagDecl();
732 } else {
733 LookupResult BaseResult(*this, &Context.Idents.get(Base), SourceLocation(),
734 LookupOrdinaryName);
735 if (LookupName(BaseResult, getCurScope()) && BaseResult.isSingleResult())
736 FoundDecl = BaseResult.getFoundDecl();
737 }
738
739 if (!FoundDecl)
740 return true;
741
742 for (StringRef NextMember : Members) {
743 const RecordType *RT = nullptr;
744 if (VarDecl *VD = dyn_cast<VarDecl>(FoundDecl))
745 RT = VD->getType()->getAs<RecordType>();
746 else if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(FoundDecl)) {
747 MarkAnyDeclReferenced(TD->getLocation(), TD, /*OdrUse=*/false);
748 // MS InlineAsm often uses struct pointer aliases as a base
749 QualType QT = TD->getUnderlyingType();
750 if (const auto *PT = QT->getAs<PointerType>())
751 QT = PT->getPointeeType();
752 RT = QT->getAs<RecordType>();
753 } else if (TypeDecl *TD = dyn_cast<TypeDecl>(FoundDecl))
754 RT = TD->getTypeForDecl()->getAs<RecordType>();
755 else if (FieldDecl *TD = dyn_cast<FieldDecl>(FoundDecl))
756 RT = TD->getType()->getAs<RecordType>();
757 if (!RT)
758 return true;
759
760 if (RequireCompleteType(AsmLoc, QualType(RT, 0),
761 diag::err_asm_incomplete_type))
762 return true;
763
764 LookupResult FieldResult(*this, &Context.Idents.get(NextMember),
765 SourceLocation(), LookupMemberName);
766
767 if (!LookupQualifiedName(FieldResult, RT->getDecl()))
768 return true;
769
770 if (!FieldResult.isSingleResult())
771 return true;
772 FoundDecl = FieldResult.getFoundDecl();
773
774 // FIXME: Handle IndirectFieldDecl?
775 FieldDecl *FD = dyn_cast<FieldDecl>(FoundDecl);
776 if (!FD)
777 return true;
778
779 const ASTRecordLayout &RL = Context.getASTRecordLayout(RT->getDecl());
780 unsigned i = FD->getFieldIndex();
781 CharUnits Result = Context.toCharUnitsFromBits(RL.getFieldOffset(i));
782 Offset += (unsigned)Result.getQuantity();
783 }
784
785 return false;
786 }
787
788 ExprResult
789 Sema::LookupInlineAsmVarDeclField(Expr *E, StringRef Member,
790 SourceLocation AsmLoc) {
791
792 QualType T = E->getType();
793 if (T->isDependentType()) {
794 DeclarationNameInfo NameInfo;
795 NameInfo.setLoc(AsmLoc);
796 NameInfo.setName(&Context.Idents.get(Member));
797 return CXXDependentScopeMemberExpr::Create(
798 Context, E, T, /*IsArrow=*/false, AsmLoc, NestedNameSpecifierLoc(),
799 SourceLocation(),
800 /*FirstQualifierInScope=*/nullptr, NameInfo, /*TemplateArgs=*/nullptr);
801 }
802
803 const RecordType *RT = T->getAs<RecordType>();
804 // FIXME: Diagnose this as field access into a scalar type.
805 if (!RT)
806 return ExprResult();
807
808 LookupResult FieldResult(*this, &Context.Idents.get(Member), AsmLoc,
809 LookupMemberName);
810
811 if (!LookupQualifiedName(FieldResult, RT->getDecl()))
812 return ExprResult();
813
814 // Only normal and indirect field results will work.
815 ValueDecl *FD = dyn_cast<FieldDecl>(FieldResult.getFoundDecl());
816 if (!FD)
817 FD = dyn_cast<IndirectFieldDecl>(FieldResult.getFoundDecl());
818 if (!FD)
819 return ExprResult();
820
821 // Make an Expr to thread through OpDecl.
822 ExprResult Result = BuildMemberReferenceExpr(
823 E, E->getType(), AsmLoc, /*IsArrow=*/false, CXXScopeSpec(),
824 SourceLocation(), nullptr, FieldResult, nullptr, nullptr);
825
826 return Result;
827 }
828
829 StmtResult Sema::ActOnMSAsmStmt(SourceLocation AsmLoc, SourceLocation LBraceLoc,
830 ArrayRef<Token> AsmToks,
831 StringRef AsmString,
832 unsigned NumOutputs, unsigned NumInputs,
833 ArrayRef<StringRef> Constraints,
834 ArrayRef<StringRef> Clobbers,
835 ArrayRef<Expr*> Exprs,
836 SourceLocation EndLoc) {
837 bool IsSimple = (NumOutputs != 0 || NumInputs != 0);
838 setFunctionHasBranchProtectedScope();
839 MSAsmStmt *NS =
840 new (Context) MSAsmStmt(Context, AsmLoc, LBraceLoc, IsSimple,
841 /*IsVolatile*/ true, AsmToks, NumOutputs, NumInputs,
842 Constraints, Exprs, AsmString,
843 Clobbers, EndLoc);
844 return NS;
845 }
846
847 LabelDecl *Sema::GetOrCreateMSAsmLabel(StringRef ExternalLabelName,
848 SourceLocation Location,
849 bool AlwaysCreate) {
850 LabelDecl* Label = LookupOrCreateLabel(PP.getIdentifierInfo(ExternalLabelName),
851 Location);
852
853 if (Label->isMSAsmLabel()) {
854 // If we have previously created this label implicitly, mark it as used.
855 Label->markUsed(Context);
856 } else {
857 // Otherwise, insert it, but only resolve it if we have seen the label itself.
858 std::string InternalName;
859 llvm::raw_string_ostream OS(InternalName);
860 // Create an internal name for the label. The name should not be a valid
861 // mangled name, and should be unique. We use a dot to make the name an
862 // invalid mangled name. We use LLVM's inline asm ${:uid} escape so that a
863 // unique label is generated each time this blob is emitted, even after
864 // inlining or LTO.
865 OS << "__MSASMLABEL_.${:uid}__";
866 for (char C : ExternalLabelName) {
867 OS << C;
868 // We escape '$' in asm strings by replacing it with "$$"
869 if (C == '$')
870 OS << '$';
871 }
872 Label->setMSAsmLabel(OS.str());
873 }
874 if (AlwaysCreate) {
875 // The label might have been created implicitly from a previously encountered
876 // goto statement. So, for both newly created and looked up labels, we mark
877 // them as resolved.
878 Label->setMSAsmLabelResolved();
879 }
880 // Adjust their location for being able to generate accurate diagnostics.
881 Label->setLocation(Location);
882
883 return Label;
884 }
clang::GCCAsmStmt
This represents a GCC inline-assembly statement extension.
Definition: Stmt.h:2675
clang::FunctionDecl
Represents a function declaration or definition.
Definition: Decl.h:1738
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:78
clang::AsmStmt::getNumInputs
unsigned getNumInputs() const
Definition: Stmt.h:2591
clang::PointerType
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2537
clang::QualType
A (possibly-)qualified type.
Definition: Type.h:638
clang::Sema::FillInlineAsmIdentifierInfo
void FillInlineAsmIdentifierInfo(Expr *Res, llvm::InlineAsmIdentifierInfo &Info)
Definition: SemaStmtAsm.cpp:652
clang::ASTContext::getASTRecordLayout
const ASTRecordLayout & getASTRecordLayout(const RecordDecl *D) const
Get or compute information about the layout of the specified record (struct/union/class) D...
Definition: RecordLayoutBuilder.cpp:2966
clang::Stmt
Stmt - This represents one statement.
Definition: Stmt.h:66
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:505
clang::Sema::ActOnGCCAsmStmt
StmtResult ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple, bool IsVolatile, unsigned NumOutputs, unsigned NumInputs, IdentifierInfo **Names, MultiExprArg Constraints, MultiExprArg Exprs, Expr *AsmString, MultiExprArg Clobbers, SourceLocation RParenLoc)
Definition: SemaStmtAsm.cpp:240
clang::Type::isRealFloatingType
bool isRealFloatingType() const
Floating point categories.
Definition: Type.cpp:1937
clang::VarDecl::getStorageClass
StorageClass getStorageClass() const
Returns the storage class as written in the source.
Definition: Decl.h:1020
Base
clang::AsmStmt::getNumOutputs
unsigned getNumOutputs() const
Definition: Stmt.h:2569
clang::Expr::MLV_IncompleteType
Definition: Expr.h:276
clang::StringLiteral::isAscii
bool isAscii() const
Definition: Expr.h:1685
clang::Sema::Diag
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Emit a diagnostic.
Definition: Sema.h:1308
clang::FieldDecl::getFieldIndex
unsigned getFieldIndex() const
Returns the index of this field within its record, as appropriate for passing to ASTRecordLayout::get...
Definition: Decl.cpp:3797
emitAndFixInvalidAsmCastLValue
static void emitAndFixInvalidAsmCastLValue(const Expr *LVal, Expr *BadArgument, Sema &S)
Emit a warning about usage of "noop"-like casts for lvalues (GNU extension) and fix the argument with...
Definition: SemaStmtAsm.cpp:70
clang::Type
The base class of the type hierarchy.
Definition: Type.h:1407
clang::TargetInfo::validateInputConstraint
bool validateInputConstraint(MutableArrayRef< ConstraintInfo > OutputConstraints, ConstraintInfo &info) const
Definition: TargetInfo.cpp:624
clang::ASTContext::getTargetInfo
const TargetInfo & getTargetInfo() const
Definition: ASTContext.h:690
clang::Expr::isModifiableLvalueResult
isModifiableLvalueResult
Definition: Expr.h:269
clang::GCCAsmStmt::setInputExpr
void setInputExpr(unsigned i, Expr *E)
Definition: Stmt.cpp:451
clang::VarDecl
Represents a variable declaration or definition.
Definition: Decl.h:813
clang::Expr::MLV_LValueCast
Definition: Expr.h:275
clang::Type::getAs
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:6748
clang::GCCAsmStmt::AnalyzeAsmString
unsigned AnalyzeAsmString(SmallVectorImpl< AsmStringPiece > &Pieces, const ASTContext &C, unsigned &DiagOffs) const
AnalyzeAsmString - Analyze the asm string of the current asm, decomposing it into pieces...
Definition: Stmt.cpp:515
SemaInternal.h
ExprCXX.h
Defines the clang::Expr interface and subclasses for C++ expressions.
checkExprMemoryConstraintCompat
static bool checkExprMemoryConstraintCompat(Sema &S, Expr *E, TargetInfo::ConstraintInfo &Info, bool is_input_expr)
Returns true if given expression is not compatible with inline assembly&#39;s memory constraint; false ot...
Definition: SemaStmtAsm.cpp:161
clang::Expr::IgnoreImpCasts
Expr * IgnoreImpCasts() LLVM_READONLY
IgnoreImpCasts - Skip past any implicit casts which might surround this expression.
Definition: Expr.h:3162
clang::IdentifierInfo
One of these records is kept for each identifier that is lexed.
Definition: IdentifierTable.h:58
clang::CharSourceRange::getBegin
SourceLocation getBegin() const
Definition: SourceLocation.h:266
clang::ASTContext
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:155
clang::NestedNameSpecifierLoc
A C++ nested-name-specifier augmented with source location information.
Definition: NestedNameSpecifier.h:237
clang::TargetInfo::getNormalizedGCCRegisterName
StringRef getNormalizedGCCRegisterName(StringRef Name, bool ReturnCanonical=false) const
Returns the "normalized" GCC register name.
Definition: TargetInfo.cpp:486
clang::TargetInfo::validateConstraintModifier
virtual bool validateConstraintModifier(StringRef, char, unsigned, std::string &) const
Definition: TargetInfo.h:919
clang::Stmt::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.cpp:288
clang::FieldDecl
Represents a member of a struct/union/class.
Definition: Decl.h:2579
clang::GCCAsmStmt::AsmStringPiece::getRange
CharSourceRange getRange() const
Definition: Stmt.h:2740
clang::DeclarationNameInfo::setName
void setName(DeclarationName N)
setName - Sets the embedded declaration name.
Definition: DeclarationName.h:717
ScopeInfo.h
clang::CastExpr::getSubExpr
Expr * getSubExpr()
Definition: Expr.h:3050
isOperandMentioned
static bool isOperandMentioned(unsigned OpNo, ArrayRef< GCCAsmStmt::AsmStringPiece > AsmStrPieces)
isOperandMentioned - Return true if the specified operand # is mentioned anywhere in the decomposed a...
Definition: SemaStmtAsm.cpp:113
clang::ASTContext::Idents
IdentifierTable & Idents
Definition: ASTContext.h:566
clang::Sema::GetOrCreateMSAsmLabel
LabelDecl * GetOrCreateMSAsmLabel(StringRef ExternalLabelName, SourceLocation Location, bool AlwaysCreate)
Definition: SemaStmtAsm.cpp:847
clang::UnqualifiedId
Represents a C++ unqualified-id that has been parsed.
Definition: DeclSpec.h:934
clang::LookupResult
Represents the results of name lookup.
Definition: Lookup.h:47
clang::ActionResult::get
PtrTy get() const
Definition: Ownership.h:174
clang::Expr::refersToBitField
bool refersToBitField() const
Returns true if this expression is a gl-value that potentially refers to a bit-field.
Definition: Expr.h:437
clang::CharUnits
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
clang::Expr::EvalResult::Val
APValue Val
Val - This is the value the expression can be folded to.
Definition: Expr.h:573
clang::Expr::getValueKind
ExprValueKind getValueKind() const
getValueKind - The value kind that this expression produces.
Definition: Expr.h:405
clang::Stmt::children
child_range children()
Definition: Stmt.cpp:237
clang::StmtError
StmtResult StmtError()
Definition: Ownership.h:284
clang::TypeDecl
Represents a declaration of a type.
Definition: Decl.h:2874
clang::TargetInfo::getConstraintRegister
virtual StringRef getConstraintRegister(StringRef Constraint, StringRef Expression) const
Extracts a register from the passed constraint (if it is a single-register constraint) and the asm la...
Definition: TargetInfo.h:790
clang::GCCAsmStmt::getOutputExpr
Expr * getOutputExpr(unsigned i)
Definition: Stmt.cpp:436
clang::Expr::MLV_IncompleteVoidType
Definition: Expr.h:272
clang::Expr::MLV_ArrayType
Definition: Expr.h:280
clang::frontend::CPlusPlus
Definition: LangStandard.h:26
clang::CXXScopeSpec
Represents a C++ nested-name-specifier or a global scope specifier.
Definition: DeclSpec.h:63
clang::CastExpr
CastExpr - Base class for type casts, including both implicit casts (ImplicitCastExpr) and explicit c...
Definition: Expr.h:2998
clang::Sema::getLangOpts
const LangOptions & getLangOpts() const
Definition: Sema.h:1231
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:167
llvm::ArrayRef
Definition: LLVM.h:32
clang::TargetInfo::isValidGCCRegisterName
virtual bool isValidGCCRegisterName(StringRef Name) const
Returns whether the passed in string is a valid register name according to GCC.
Definition: TargetInfo.cpp:441
clang::GCCAsmStmt::AsmStringPiece::isOperand
bool isOperand() const
Definition: Stmt.h:2731
Parent
NodeId Parent
Definition: ASTDiff.cpp:192
clang::Sema::LookupInlineAsmIdentifier
ExprResult LookupInlineAsmIdentifier(CXXScopeSpec &SS, SourceLocation TemplateKWLoc, UnqualifiedId &Id, bool IsUnevaluatedContext)
Definition: SemaStmtAsm.cpp:673
clang::Decl::hasAttr
bool hasAttr() const
Definition: DeclBase.h:531
clang::Sema
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:278
clang::StringLiteral::getString
StringRef getString() const
Definition: Expr.h:1649
clang::Expr::EvaluateAsLValue
bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const
EvaluateAsLValue - Evaluate an expression to see if we can fold it to an lvalue with link time known ...
Definition: ExprConstant.cpp:10971
clang::TargetInfo::isValidClobber
bool isValidClobber(StringRef Name) const
Returns whether the passed in string is a valid clobber in an inline asm statement.
Definition: TargetInfo.cpp:433
clang::Expr::IgnoreParenNoopCasts
Expr * IgnoreParenNoopCasts(ASTContext &Ctx) LLVM_READONLY
IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the value (including ptr->int ...
Definition: Expr.cpp:2726
clang::CastKind
CastKind
CastKind - The kind of operation required for a conversion.
Definition: OperationKinds.h:21
clang::GCCAsmStmt::AsmStringPiece::getOperandNo
unsigned getOperandNo() const
Definition: Stmt.h:2735
clang::CharUnits::getQuantity
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:179
CheckNakedParmReference
static bool CheckNakedParmReference(Expr *E, Sema &S)
Definition: SemaStmtAsm.cpp:128
Offset
unsigned Offset
Definition: Format.cpp:1631
clang::ASTRecordLayout
ASTRecordLayout - This class contains layout information for one RecordDecl, which is a struct/union/...
Definition: RecordLayout.h:39
clang::TargetInfo
Exposes information about the current target.
Definition: TargetInfo.h:54
clang::ValueDecl
Represent the declaration of a variable (in which case it is an lvalue) a function (in which case it ...
Definition: Decl.h:637
clang::Expr
This represents one expression.
Definition: Expr.h:106
llvm::MutableArrayRef
Definition: LLVM.h:33
Label
std::string Label
Definition: UsingDeclarationsSorter.cpp:70
Id
int Id
Definition: ASTDiff.cpp:191
getClobberConflictLocation
static SourceLocation getClobberConflictLocation(MultiExprArg Exprs, StringLiteral **Constraints, StringLiteral **Clobbers, int NumClobbers, const TargetInfo &Target, ASTContext &Cont)
Definition: SemaStmtAsm.cpp:211
clang::GCCAsmStmt::AsmStringPiece
AsmStringPiece - this is part of a decomposed asm string specification (for use with the AnalyzeAsmSt...
Definition: Stmt.h:2708
Lookup.h
Preprocessor.h
Defines the clang::Preprocessor interface.
clang::CXXDependentScopeMemberExpr::Create
static CXXDependentScopeMemberExpr * Create(const ASTContext &Ctx, Expr *Base, QualType BaseType, bool IsArrow, SourceLocation OperatorLoc, NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc, NamedDecl *FirstQualifierFoundInScope, DeclarationNameInfo MemberNameInfo, const TemplateArgumentListInfo *TemplateArgs)
Definition: ExprCXX.cpp:1350
Scope.h
TypeLoc.h
Defines the clang::TypeLoc interface and its subclasses.
clang::Expr::getType
QualType getType() const
Definition: Expr.h:128
clang::Expr::setValueKind
void setValueKind(ExprValueKind Cat)
setValueKind - Set the value kind produced by this expression.
Definition: Expr.h:422
clang::BaseResult
ActionResult< CXXBaseSpecifier * > BaseResult
Definition: Ownership.h:270
clang::MSAsmStmt
This represents a Microsoft inline-assembly statement extension.
Definition: Stmt.h:2850
clang::ActionResult::isInvalid
bool isInvalid() const
Definition: Ownership.h:170
clang::Decl::setLocation
void setLocation(SourceLocation L)
Definition: DeclBase.h:419
clang::ActionResult::isUsable
bool isUsable() const
Definition: Ownership.h:171
clang::TargetInfo::ConstraintInfo
Definition: TargetInfo.h:795
clang::RecordType::getDecl
RecordDecl * getDecl() const
Definition: Type.h:4380
clang::ASTRecordLayout::getFieldOffset
uint64_t getFieldOffset(unsigned FieldNo) const
getFieldOffset - Get the offset of the given field index, in bits.
Definition: RecordLayout.h:191
clang::Expr::EvaluateAsRValue
bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx, bool InConstantContext=false) const
EvaluateAsRValue - Return true if this is a constant which we can fold to an rvalue using any crazy t...
Definition: ExprConstant.cpp:10937
clang::ActionResult
ActionResult - This structure is used while parsing/acting on expressions, stmts, etc...
Definition: Ownership.h:157
clang::Expr::EvalResult::isGlobalLValue
bool isGlobalLValue() const
Definition: ExprConstant.cpp:11085
clang::SourceLocation
Encodes a location in the source.
Definition: SourceLocation.h:88
clang::IdentifierTable::get
IdentifierInfo & get(StringRef Name)
Return the identifier token info for the specified named identifier.
Definition: IdentifierTable.h:519
extractRegisterName
static StringRef extractRegisterName(const Expr *Expression, const TargetInfo &Target)
Definition: SemaStmtAsm.cpp:192
clang::Sema::LookupInlineAsmVarDeclField
ExprResult LookupInlineAsmVarDeclField(Expr *RefExpr, StringRef Member, SourceLocation AsmLoc)
Definition: SemaStmtAsm.cpp:789
clang::LabelDecl
Represents the declaration of a label.
Definition: Decl.h:469
removeLValueToRValueCast
static void removeLValueToRValueCast(Expr *E)
Remove the upper-level LValueToRValue cast from an expression.
Definition: SemaStmtAsm.cpp:31
clang::GCCAsmStmt::AsmStringPiece::getString
const std::string & getString() const
Definition: Stmt.h:2733
Initialization.h
clang::ASTContext::getAsArrayType
const ArrayType * getAsArrayType(QualType T) const
Type Query functions.
Definition: ASTContext.cpp:5409
clang::TargetInfo::validateOutputConstraint
bool validateOutputConstraint(ConstraintInfo &Info) const
Definition: TargetInfo.cpp:527
clang::Expr::isValueDependent
bool isValueDependent() const
isValueDependent - Determines whether this expression is value-dependent (C++ [temp.dep.constexpr]).
Definition: Expr.h:149
clang::StringLiteral::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.h:1741
llvm::SmallVector
Definition: LLVM.h:36
clang::LabelDecl::isMSAsmLabel
bool isMSAsmLabel() const
Definition: Decl.h:503
clang::Sema::LookupInlineAsmField
bool LookupInlineAsmField(StringRef Base, StringRef Member, unsigned &Offset, SourceLocation AsmLoc)
Definition: SemaStmtAsm.cpp:720
clang::Expr::isLValue
bool isLValue() const
isLValue - True if this expression is an "l-value" according to the rules of the current language...
Definition: Expr.h:249
clang::Expr::isModifiableLvalue
isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc=nullptr) const
isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, does not have an incomplet...
Definition: ExprClassification.cpp:672
clang::Expr::refersToVectorElement
bool refersToVectorElement() const
Returns whether this expression refers to a vector element.
Definition: Expr.cpp:3642
clang::GCCAsmStmt::getInputExpr
Expr * getInputExpr(unsigned i)
Definition: Stmt.cpp:447
clang::IdentifierInfo::getName
StringRef getName() const
Return the actual identifier string.
Definition: IdentifierTable.h:156
clang::TypedefNameDecl
Base class for declarations which introduce a typedef-name.
Definition: Decl.h:2916
clang
Dataflow Directional Tag Classes.
Definition: CFGReachabilityAnalysis.h:22
clang::SourceLocation::isValid
bool isValid() const
Return true if this is a valid SourceLocation object.
Definition: SourceLocation.h:108
clang::Expr::EvalResult
EvalResult is a struct with detailed info about an evaluated expression.
Definition: Expr.h:571
clang::Sema::ActOnMSAsmStmt
StmtResult ActOnMSAsmStmt(SourceLocation AsmLoc, SourceLocation LBraceLoc, ArrayRef< Token > AsmToks, StringRef AsmString, unsigned NumOutputs, unsigned NumInputs, ArrayRef< StringRef > Constraints, ArrayRef< StringRef > Clobbers, ArrayRef< Expr *> Exprs, SourceLocation EndLoc)
Definition: SemaStmtAsm.cpp:829
clang::IndirectFieldDecl
Represents a field injected from an anonymous union/struct into the parent scope. ...
Definition: Decl.h:2825
clang::CastExpr::setSubExpr
void setSubExpr(Expr *E)
Definition: Expr.h:3052
clang::Type::isBooleanType
bool isBooleanType() const
Definition: Type.h:6657
clang::GCCAsmStmt::AsmStringPiece::getModifier
char getModifier() const
getModifier - Get the modifier for this operand, if present.
Definition: Stmt.cpp:427
clang::TargetInfo::ConstraintInfo::hasTiedOperand
bool hasTiedOperand() const
Return true if this input operand is a matching constraint that ties it to an output operand...
Definition: TargetInfo.h:838
clang::DeclarationNameInfo
DeclarationNameInfo - A collector data type for bundling together a DeclarationName and the correspnd...
Definition: DeclarationName.h:691
clang::TargetInfo::ConstraintInfo::getConstraintStr
const std::string & getConstraintStr() const
Definition: TargetInfo.h:822
clang::DeclAttrsMatchCUDAMode
bool DeclAttrsMatchCUDAMode(const LangOptions &LangOpts, Decl *D)
Definition: SemaInternal.h:54
clang::RecordType
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4370
clang::Type::isIntegerType
bool isIntegerType() const
isIntegerType() does not include complex integers (a GCC extension).
Definition: Type.h:6578
clang::Decl::getAttr
T * getAttr() const
Definition: DeclBase.h:527
clang::Type::isFunctionType
bool isFunctionType() const
Definition: Type.h:6292
clang::TargetInfo::ConstraintInfo::getTiedOperand
unsigned getTiedOperand() const
Definition: TargetInfo.h:839
clang::ASTContext::hasSameType
bool hasSameType(QualType T1, QualType T2) const
Determine whether the given types T1 and T2 are equivalent.
Definition: ASTContext.h:2269
clang::Decl::markUsed
void markUsed(ASTContext &C)
Mark the declaration used, in the sense of odr-use.
Definition: DeclBase.cpp:412
clang::ASTContext::getTypeSize
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:2070
clang::Type::isIncompleteType
bool isIncompleteType(NamedDecl **Def=nullptr) const
Types are partitioned into 3 broad categories (C99 6.2.5p1): object types, function types...
Definition: Type.cpp:2031
clang::DeclarationNameInfo::setLoc
void setLoc(SourceLocation L)
setLoc - Sets the main location of the declaration name.
Definition: DeclarationName.h:723
clang::ASTContext::toCharUnitsFromBits
CharUnits toCharUnitsFromBits(int64_t BitSize) const
Convert a size in bits to a size in characters.
Definition: ASTContext.cpp:2156
clang::Expr::refersToGlobalRegisterVar
bool refersToGlobalRegisterVar() const
Returns whether this expression refers to a global register variable.
Definition: Expr.cpp:3668
clang::ExprResult
ActionResult< Expr * > ExprResult
Definition: Ownership.h:267
clang::TargetInfo::validateOutputSize
virtual bool validateOutputSize(StringRef, unsigned) const
Definition: TargetInfo.h:909
clang::Type::isVoidType
bool isVoidType() const
Definition: Type.h:6544
CheckAsmLValue
static bool CheckAsmLValue(Expr *E, Sema &S)
CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently ignore "noop" casts in p...
Definition: SemaStmtAsm.cpp:89
RecordLayout.h
clang::LabelDecl::setMSAsmLabel
void setMSAsmLabel(StringRef Name)
Definition: Decl.cpp:4385
clang::Sema::CurContext
DeclContext * CurContext
CurContext - This is the current declaration context of parsing.
Definition: Sema.h:336
clang::Expr::isRValue
bool isRValue() const
Definition: Expr.h:250
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::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:276
clang::StringLiteral
StringLiteral - This represents a string literal expression, e.g.
Definition: Expr.h:1566
TargetInfo.h
Defines the clang::TargetInfo interface.
clang::Expr::MLV_Valid
Definition: Expr.h:270
clang::ExprError
ExprResult ExprError()
Definition: Ownership.h:283
clang::SC_Register
Definition: Specifiers.h:215
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:2079
clang::Expr::isEvaluatable
bool isEvaluatable(const ASTContext &Ctx, SideEffectsKind AllowSideEffects=SE_NoSideEffects) const
isEvaluatable - Call EvaluateAsRValue to see if this expression can be constant folded without side-e...
Definition: ExprConstant.cpp:11040
clang::DeclRefExpr
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:1041
clang::Type::isPointerType
bool isPointerType() const
Definition: Type.h:6296
clang::ASTContext::getTypeSizeInChars
CharUnits getTypeSizeInChars(QualType T) const
Return the size of the specified (complete) type T, in characters.
Definition: ASTContext.cpp:2167
clang::LabelDecl::setMSAsmLabelResolved
void setMSAsmLabelResolved()
Definition: Decl.h:507
clang::TargetInfo::validateInputSize
virtual bool validateInputSize(StringRef, unsigned) const
Definition: TargetInfo.h:914
clang::Sema::Context
ASTContext & Context
Definition: Sema.h:324
clang::NamedDecl
This represents a decl that may have a name.
Definition: Decl.h:249
clang::APValue::getInt
APSInt & getInt()
Definition: APValue.h:252
clang::Attr
Attr - This represents one attribute.
Definition: Attr.h:44