clang 10.0.0git

SemaStmtAsm.cpp
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1 //===--- SemaStmtAsm.cpp - Semantic Analysis for Asm Statements -----------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements semantic analysis for inline asm statements.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "clang/AST/ExprCXX.h"
14 #include "clang/AST/GlobalDecl.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 unsigned NumLabels,
214 const TargetInfo &Target, ASTContext &Cont) {
215 llvm::StringSet<> InOutVars;
216 // Collect all the input and output registers from the extended asm
217 // statement in order to check for conflicts with the clobber list
218 for (unsigned int i = 0; i < Exprs.size() - NumLabels; ++i) {
219 StringRef Constraint = Constraints[i]->getString();
220 StringRef InOutReg = Target.getConstraintRegister(
221 Constraint, extractRegisterName(Exprs[i], Target));
222 if (InOutReg != "")
223 InOutVars.insert(InOutReg);
224 }
225 // Check for each item in the clobber list if it conflicts with the input
226 // or output
227 for (int i = 0; i < NumClobbers; ++i) {
228 StringRef Clobber = Clobbers[i]->getString();
229 // We only check registers, therefore we don't check cc and memory
230 // clobbers
231 if (Clobber == "cc" || Clobber == "memory")
232 continue;
233 Clobber = Target.getNormalizedGCCRegisterName(Clobber, true);
234 // Go over the output's registers we collected
235 if (InOutVars.count(Clobber))
236 return Clobbers[i]->getBeginLoc();
237 }
238 return SourceLocation();
239 }
240
241 StmtResult Sema::ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
242 bool IsVolatile, unsigned NumOutputs,
243 unsigned NumInputs, IdentifierInfo **Names,
244 MultiExprArg constraints, MultiExprArg Exprs,
245 Expr *asmString, MultiExprArg clobbers,
246 unsigned NumLabels,
247 SourceLocation RParenLoc) {
248 unsigned NumClobbers = clobbers.size();
249 StringLiteral **Constraints =
250 reinterpret_cast<StringLiteral**>(constraints.data());
251 StringLiteral *AsmString = cast<StringLiteral>(asmString);
252 StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.data());
253
254 SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos;
255
256 // The parser verifies that there is a string literal here.
257 assert(AsmString->isAscii());
258
259 FunctionDecl *FD = dyn_cast<FunctionDecl>(getCurLexicalContext());
260 llvm::StringMap<bool> FeatureMap;
261 Context.getFunctionFeatureMap(FeatureMap, FD);
262
263 for (unsigned i = 0; i != NumOutputs; i++) {
264 StringLiteral *Literal = Constraints[i];
265 assert(Literal->isAscii());
266
267 StringRef OutputName;
268 if (Names[i])
269 OutputName = Names[i]->getName();
270
271 TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName);
272 if (!Context.getTargetInfo().validateOutputConstraint(Info)) {
273 targetDiag(Literal->getBeginLoc(),
274 diag::err_asm_invalid_output_constraint)
275 << Info.getConstraintStr();
276 return new (Context)
277 GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
278 NumInputs, Names, Constraints, Exprs.data(), AsmString,
279 NumClobbers, Clobbers, NumLabels, RParenLoc);
280 }
281
282 ExprResult ER = CheckPlaceholderExpr(Exprs[i]);
283 if (ER.isInvalid())
284 return StmtError();
285 Exprs[i] = ER.get();
286
287 // Check that the output exprs are valid lvalues.
288 Expr *OutputExpr = Exprs[i];
289
290 // Referring to parameters is not allowed in naked functions.
291 if (CheckNakedParmReference(OutputExpr, *this))
292 return StmtError();
293
294 // Check that the output expression is compatible with memory constraint.
295 if (Info.allowsMemory() &&
296 checkExprMemoryConstraintCompat(*this, OutputExpr, Info, false))
297 return StmtError();
298
299 OutputConstraintInfos.push_back(Info);
300
301 // If this is dependent, just continue.
302 if (OutputExpr->isTypeDependent())
303 continue;
304
305 Expr::isModifiableLvalueResult IsLV =
306 OutputExpr->isModifiableLvalue(Context, /*Loc=*/nullptr);
307 switch (IsLV) {
308 case Expr::MLV_Valid:
309 // Cool, this is an lvalue.
310 break;
311 case Expr::MLV_ArrayType:
312 // This is OK too.
313 break;
314 case Expr::MLV_LValueCast: {
315 const Expr *LVal = OutputExpr->IgnoreParenNoopCasts(Context);
316 emitAndFixInvalidAsmCastLValue(LVal, OutputExpr, *this);
317 // Accept, even if we emitted an error diagnostic.
318 break;
319 }
320 case Expr::MLV_IncompleteType:
321 case Expr::MLV_IncompleteVoidType:
322 if (RequireCompleteType(OutputExpr->getBeginLoc(), Exprs[i]->getType(),
323 diag::err_dereference_incomplete_type))
324 return StmtError();
325 LLVM_FALLTHROUGH;
326 default:
327 return StmtError(Diag(OutputExpr->getBeginLoc(),
328 diag::err_asm_invalid_lvalue_in_output)
329 << OutputExpr->getSourceRange());
330 }
331
332 unsigned Size = Context.getTypeSize(OutputExpr->getType());
333 if (!Context.getTargetInfo().validateOutputSize(
334 FeatureMap, Literal->getString(), Size)) {
335 targetDiag(OutputExpr->getBeginLoc(), diag::err_asm_invalid_output_size)
336 << Info.getConstraintStr();
337 return new (Context)
338 GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
339 NumInputs, Names, Constraints, Exprs.data(), AsmString,
340 NumClobbers, Clobbers, NumLabels, RParenLoc);
341 }
342 }
343
344 SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos;
345
346 for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) {
347 StringLiteral *Literal = Constraints[i];
348 assert(Literal->isAscii());
349
350 StringRef InputName;
351 if (Names[i])
352 InputName = Names[i]->getName();
353
354 TargetInfo::ConstraintInfo Info(Literal->getString(), InputName);
355 if (!Context.getTargetInfo().validateInputConstraint(OutputConstraintInfos,
356 Info)) {
357 targetDiag(Literal->getBeginLoc(), diag::err_asm_invalid_input_constraint)
358 << Info.getConstraintStr();
359 return new (Context)
360 GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
361 NumInputs, Names, Constraints, Exprs.data(), AsmString,
362 NumClobbers, Clobbers, NumLabels, RParenLoc);
363 }
364
365 ExprResult ER = CheckPlaceholderExpr(Exprs[i]);
366 if (ER.isInvalid())
367 return StmtError();
368 Exprs[i] = ER.get();
369
370 Expr *InputExpr = Exprs[i];
371
372 // Referring to parameters is not allowed in naked functions.
373 if (CheckNakedParmReference(InputExpr, *this))
374 return StmtError();
375
376 // Check that the input expression is compatible with memory constraint.
377 if (Info.allowsMemory() &&
378 checkExprMemoryConstraintCompat(*this, InputExpr, Info, true))
379 return StmtError();
380
381 // Only allow void types for memory constraints.
382 if (Info.allowsMemory() && !Info.allowsRegister()) {
383 if (CheckAsmLValue(InputExpr, *this))
384 return StmtError(Diag(InputExpr->getBeginLoc(),
385 diag::err_asm_invalid_lvalue_in_input)
386 << Info.getConstraintStr()
387 << InputExpr->getSourceRange());
388 } else if (Info.requiresImmediateConstant() && !Info.allowsRegister()) {
389 if (!InputExpr->isValueDependent()) {
390 Expr::EvalResult EVResult;
391 if (InputExpr->EvaluateAsRValue(EVResult, Context, true)) {
392 // For compatibility with GCC, we also allow pointers that would be
393 // integral constant expressions if they were cast to int.
394 llvm::APSInt IntResult;
395 if (EVResult.Val.toIntegralConstant(IntResult, InputExpr->getType(),
396 Context))
397 if (!Info.isValidAsmImmediate(IntResult))
398 return StmtError(Diag(InputExpr->getBeginLoc(),
399 diag::err_invalid_asm_value_for_constraint)
400 << IntResult.toString(10)
401 << Info.getConstraintStr()
402 << InputExpr->getSourceRange());
403 }
404 }
405
406 } else {
407 ExprResult Result = DefaultFunctionArrayLvalueConversion(Exprs[i]);
408 if (Result.isInvalid())
409 return StmtError();
410
411 Exprs[i] = Result.get();
412 }
413
414 if (Info.allowsRegister()) {
415 if (InputExpr->getType()->isVoidType()) {
416 return StmtError(
417 Diag(InputExpr->getBeginLoc(), diag::err_asm_invalid_type_in_input)
418 << InputExpr->getType() << Info.getConstraintStr()
419 << InputExpr->getSourceRange());
420 }
421 }
422
423 InputConstraintInfos.push_back(Info);
424
425 const Type *Ty = Exprs[i]->getType().getTypePtr();
426 if (Ty->isDependentType())
427 continue;
428
429 if (!Ty->isVoidType() || !Info.allowsMemory())
430 if (RequireCompleteType(InputExpr->getBeginLoc(), Exprs[i]->getType(),
431 diag::err_dereference_incomplete_type))
432 return StmtError();
433
434 unsigned Size = Context.getTypeSize(Ty);
435 if (!Context.getTargetInfo().validateInputSize(FeatureMap,
436 Literal->getString(), Size))
437 return StmtResult(
438 targetDiag(InputExpr->getBeginLoc(), diag::err_asm_invalid_input_size)
439 << Info.getConstraintStr());
440 }
441
442 // Check that the clobbers are valid.
443 for (unsigned i = 0; i != NumClobbers; i++) {
444 StringLiteral *Literal = Clobbers[i];
445 assert(Literal->isAscii());
446
447 StringRef Clobber = Literal->getString();
448
449 if (!Context.getTargetInfo().isValidClobber(Clobber)) {
450 targetDiag(Literal->getBeginLoc(), diag::err_asm_unknown_register_name)
451 << Clobber;
452 return new (Context)
453 GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
454 NumInputs, Names, Constraints, Exprs.data(), AsmString,
455 NumClobbers, Clobbers, NumLabels, RParenLoc);
456 }
457 }
458
459 GCCAsmStmt *NS =
460 new (Context) GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
461 NumInputs, Names, Constraints, Exprs.data(),
462 AsmString, NumClobbers, Clobbers, NumLabels,
463 RParenLoc);
464 // Validate the asm string, ensuring it makes sense given the operands we
465 // have.
466 SmallVector<GCCAsmStmt::AsmStringPiece, 8> Pieces;
467 unsigned DiagOffs;
468 if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) {
469 targetDiag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID)
470 << AsmString->getSourceRange();
471 return NS;
472 }
473
474 // Validate constraints and modifiers.
475 for (unsigned i = 0, e = Pieces.size(); i != e; ++i) {
476 GCCAsmStmt::AsmStringPiece &Piece = Pieces[i];
477 if (!Piece.isOperand()) continue;
478
479 // Look for the correct constraint index.
480 unsigned ConstraintIdx = Piece.getOperandNo();
481 // Labels are the last in the Exprs list.
482 if (NS->isAsmGoto() && ConstraintIdx >= NS->getNumInputs())
483 continue;
484 unsigned NumOperands = NS->getNumOutputs() + NS->getNumInputs();
485 // Look for the (ConstraintIdx - NumOperands + 1)th constraint with
486 // modifier '+'.
487 if (ConstraintIdx >= NumOperands) {
488 unsigned I = 0, E = NS->getNumOutputs();
489
490 for (unsigned Cnt = ConstraintIdx - NumOperands; I != E; ++I)
491 if (OutputConstraintInfos[I].isReadWrite() && Cnt-- == 0) {
492 ConstraintIdx = I;
493 break;
494 }
495
496 assert(I != E && "Invalid operand number should have been caught in "
497 " AnalyzeAsmString");
498 }
499
500 // Now that we have the right indexes go ahead and check.
501 StringLiteral *Literal = Constraints[ConstraintIdx];
502 const Type *Ty = Exprs[ConstraintIdx]->getType().getTypePtr();
503 if (Ty->isDependentType() || Ty->isIncompleteType())
504 continue;
505
506 unsigned Size = Context.getTypeSize(Ty);
507 std::string SuggestedModifier;
508 if (!Context.getTargetInfo().validateConstraintModifier(
509 Literal->getString(), Piece.getModifier(), Size,
510 SuggestedModifier)) {
511 targetDiag(Exprs[ConstraintIdx]->getBeginLoc(),
512 diag::warn_asm_mismatched_size_modifier);
513
514 if (!SuggestedModifier.empty()) {
515 auto B = targetDiag(Piece.getRange().getBegin(),
516 diag::note_asm_missing_constraint_modifier)
517 << SuggestedModifier;
518 SuggestedModifier = "%" + SuggestedModifier + Piece.getString();
519 B << FixItHint::CreateReplacement(Piece.getRange(), SuggestedModifier);
520 }
521 }
522 }
523
524 // Validate tied input operands for type mismatches.
525 unsigned NumAlternatives = ~0U;
526 for (unsigned i = 0, e = OutputConstraintInfos.size(); i != e; ++i) {
527 TargetInfo::ConstraintInfo &Info = OutputConstraintInfos[i];
528 StringRef ConstraintStr = Info.getConstraintStr();
529 unsigned AltCount = ConstraintStr.count(',') + 1;
530 if (NumAlternatives == ~0U) {
531 NumAlternatives = AltCount;
532 } else if (NumAlternatives != AltCount) {
533 targetDiag(NS->getOutputExpr(i)->getBeginLoc(),
534 diag::err_asm_unexpected_constraint_alternatives)
535 << NumAlternatives << AltCount;
536 return NS;
537 }
538 }
539 SmallVector<size_t, 4> InputMatchedToOutput(OutputConstraintInfos.size(),
540 ~0U);
541 for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) {
542 TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i];
543 StringRef ConstraintStr = Info.getConstraintStr();
544 unsigned AltCount = ConstraintStr.count(',') + 1;
545 if (NumAlternatives == ~0U) {
546 NumAlternatives = AltCount;
547 } else if (NumAlternatives != AltCount) {
548 targetDiag(NS->getInputExpr(i)->getBeginLoc(),
549 diag::err_asm_unexpected_constraint_alternatives)
550 << NumAlternatives << AltCount;
551 return NS;
552 }
553
554 // If this is a tied constraint, verify that the output and input have
555 // either exactly the same type, or that they are int/ptr operands with the
556 // same size (int/long, int*/long, are ok etc).
557 if (!Info.hasTiedOperand()) continue;
558
559 unsigned TiedTo = Info.getTiedOperand();
560 unsigned InputOpNo = i+NumOutputs;
561 Expr *OutputExpr = Exprs[TiedTo];
562 Expr *InputExpr = Exprs[InputOpNo];
563
564 // Make sure no more than one input constraint matches each output.
565 assert(TiedTo < InputMatchedToOutput.size() && "TiedTo value out of range");
566 if (InputMatchedToOutput[TiedTo] != ~0U) {
567 targetDiag(NS->getInputExpr(i)->getBeginLoc(),
568 diag::err_asm_input_duplicate_match)
569 << TiedTo;
570 targetDiag(NS->getInputExpr(InputMatchedToOutput[TiedTo])->getBeginLoc(),
571 diag::note_asm_input_duplicate_first)
572 << TiedTo;
573 return NS;
574 }
575 InputMatchedToOutput[TiedTo] = i;
576
577 if (OutputExpr->isTypeDependent() || InputExpr->isTypeDependent())
578 continue;
579
580 QualType InTy = InputExpr->getType();
581 QualType OutTy = OutputExpr->getType();
582 if (Context.hasSameType(InTy, OutTy))
583 continue; // All types can be tied to themselves.
584
585 // Decide if the input and output are in the same domain (integer/ptr or
586 // floating point.
587 enum AsmDomain {
588 AD_Int, AD_FP, AD_Other
589 } InputDomain, OutputDomain;
590
591 if (InTy->isIntegerType() || InTy->isPointerType())
592 InputDomain = AD_Int;
593 else if (InTy->isRealFloatingType())
594 InputDomain = AD_FP;
595 else
596 InputDomain = AD_Other;
597
598 if (OutTy->isIntegerType() || OutTy->isPointerType())
599 OutputDomain = AD_Int;
600 else if (OutTy->isRealFloatingType())
601 OutputDomain = AD_FP;
602 else
603 OutputDomain = AD_Other;
604
605 // They are ok if they are the same size and in the same domain. This
606 // allows tying things like:
607 // void* to int*
608 // void* to int if they are the same size.
609 // double to long double if they are the same size.
610 //
611 uint64_t OutSize = Context.getTypeSize(OutTy);
612 uint64_t InSize = Context.getTypeSize(InTy);
613 if (OutSize == InSize && InputDomain == OutputDomain &&
614 InputDomain != AD_Other)
615 continue;
616
617 // If the smaller input/output operand is not mentioned in the asm string,
618 // then we can promote the smaller one to a larger input and the asm string
619 // won't notice.
620 bool SmallerValueMentioned = false;
621
622 // If this is a reference to the input and if the input was the smaller
623 // one, then we have to reject this asm.
624 if (isOperandMentioned(InputOpNo, Pieces)) {
625 // This is a use in the asm string of the smaller operand. Since we
626 // codegen this by promoting to a wider value, the asm will get printed
627 // "wrong".
628 SmallerValueMentioned |= InSize < OutSize;
629 }
630 if (isOperandMentioned(TiedTo, Pieces)) {
631 // If this is a reference to the output, and if the output is the larger
632 // value, then it's ok because we'll promote the input to the larger type.
633 SmallerValueMentioned |= OutSize < InSize;
634 }
635
636 // If the smaller value wasn't mentioned in the asm string, and if the
637 // output was a register, just extend the shorter one to the size of the
638 // larger one.
639 if (!SmallerValueMentioned && InputDomain != AD_Other &&
640 OutputConstraintInfos[TiedTo].allowsRegister())
641 continue;
642
643 // Either both of the operands were mentioned or the smaller one was
644 // mentioned. One more special case that we'll allow: if the tied input is
645 // integer, unmentioned, and is a constant, then we'll allow truncating it
646 // down to the size of the destination.
647 if (InputDomain == AD_Int && OutputDomain == AD_Int &&
648 !isOperandMentioned(InputOpNo, Pieces) &&
649 InputExpr->isEvaluatable(Context)) {
650 CastKind castKind =
651 (OutTy->isBooleanType() ? CK_IntegralToBoolean : CK_IntegralCast);
652 InputExpr = ImpCastExprToType(InputExpr, OutTy, castKind).get();
653 Exprs[InputOpNo] = InputExpr;
654 NS->setInputExpr(i, InputExpr);
655 continue;
656 }
657
658 targetDiag(InputExpr->getBeginLoc(), diag::err_asm_tying_incompatible_types)
659 << InTy << OutTy << OutputExpr->getSourceRange()
660 << InputExpr->getSourceRange();
661 return NS;
662 }
663
664 // Check for conflicts between clobber list and input or output lists
665 SourceLocation ConstraintLoc =
666 getClobberConflictLocation(Exprs, Constraints, Clobbers, NumClobbers,
667 NumLabels,
668 Context.getTargetInfo(), Context);
669 if (ConstraintLoc.isValid())
670 targetDiag(ConstraintLoc, diag::error_inoutput_conflict_with_clobber);
671
672 // Check for duplicate asm operand name between input, output and label lists.
673 typedef std::pair<StringRef , Expr *> NamedOperand;
674 SmallVector<NamedOperand, 4> NamedOperandList;
675 for (unsigned i = 0, e = NumOutputs + NumInputs + NumLabels; i != e; ++i)
676 if (Names[i])
677 NamedOperandList.emplace_back(
678 std::make_pair(Names[i]->getName(), Exprs[i]));
679 // Sort NamedOperandList.
680 std::stable_sort(NamedOperandList.begin(), NamedOperandList.end(),
681 [](const NamedOperand &LHS, const NamedOperand &RHS) {
682 return LHS.first < RHS.first;
683 });
684 // Find adjacent duplicate operand.
685 SmallVector<NamedOperand, 4>::iterator Found =
686 std::adjacent_find(begin(NamedOperandList), end(NamedOperandList),
687 [](const NamedOperand &LHS, const NamedOperand &RHS) {
688 return LHS.first == RHS.first;
689 });
690 if (Found != NamedOperandList.end()) {
691 Diag((Found + 1)->second->getBeginLoc(),
692 diag::error_duplicate_asm_operand_name)
693 << (Found + 1)->first;
694 Diag(Found->second->getBeginLoc(), diag::note_duplicate_asm_operand_name)
695 << Found->first;
696 return StmtError();
697 }
698 if (NS->isAsmGoto())
699 setFunctionHasBranchIntoScope();
700 return NS;
701 }
702
703 void Sema::FillInlineAsmIdentifierInfo(Expr *Res,
704 llvm::InlineAsmIdentifierInfo &Info) {
705 QualType T = Res->getType();
706 Expr::EvalResult Eval;
707 if (T->isFunctionType() || T->isDependentType())
708 return Info.setLabel(Res);
709 if (Res->isRValue()) {
710 bool IsEnum = isa<clang::EnumType>(T);
711 if (DeclRefExpr *DRE = dyn_cast<clang::DeclRefExpr>(Res))
712 if (DRE->getDecl()->getKind() == Decl::EnumConstant)
713 IsEnum = true;
714 if (IsEnum && Res->EvaluateAsRValue(Eval, Context))
715 return Info.setEnum(Eval.Val.getInt().getSExtValue());
716
717 return Info.setLabel(Res);
718 }
719 unsigned Size = Context.getTypeSizeInChars(T).getQuantity();
720 unsigned Type = Size;
721 if (const auto *ATy = Context.getAsArrayType(T))
722 Type = Context.getTypeSizeInChars(ATy->getElementType()).getQuantity();
723 bool IsGlobalLV = false;
724 if (Res->EvaluateAsLValue(Eval, Context))
725 IsGlobalLV = Eval.isGlobalLValue();
726 Info.setVar(Res, IsGlobalLV, Size, Type);
727 }
728
729 ExprResult Sema::LookupInlineAsmIdentifier(CXXScopeSpec &SS,
730 SourceLocation TemplateKWLoc,
731 UnqualifiedId &Id,
732 bool IsUnevaluatedContext) {
733
734 if (IsUnevaluatedContext)
735 PushExpressionEvaluationContext(
736 ExpressionEvaluationContext::UnevaluatedAbstract,
737 ReuseLambdaContextDecl);
738
739 ExprResult Result = ActOnIdExpression(getCurScope(), SS, TemplateKWLoc, Id,
740 /*trailing lparen*/ false,
741 /*is & operand*/ false,
742 /*CorrectionCandidateCallback=*/nullptr,
743 /*IsInlineAsmIdentifier=*/ true);
744
745 if (IsUnevaluatedContext)
746 PopExpressionEvaluationContext();
747
748 if (!Result.isUsable()) return Result;
749
750 Result = CheckPlaceholderExpr(Result.get());
751 if (!Result.isUsable()) return Result;
752
753 // Referring to parameters is not allowed in naked functions.
754 if (CheckNakedParmReference(Result.get(), *this))
755 return ExprError();
756
757 QualType T = Result.get()->getType();
758
759 if (T->isDependentType()) {
760 return Result;
761 }
762
763 // Any sort of function type is fine.
764 if (T->isFunctionType()) {
765 return Result;
766 }
767
768 // Otherwise, it needs to be a complete type.
769 if (RequireCompleteExprType(Result.get(), diag::err_asm_incomplete_type)) {
770 return ExprError();
771 }
772
773 return Result;
774 }
775
776 bool Sema::LookupInlineAsmField(StringRef Base, StringRef Member,
777 unsigned &Offset, SourceLocation AsmLoc) {
778 Offset = 0;
779 SmallVector<StringRef, 2> Members;
780 Member.split(Members, ".");
781
782 NamedDecl *FoundDecl = nullptr;
783
784 // MS InlineAsm uses 'this' as a base
785 if (getLangOpts().CPlusPlus && Base.equals("this")) {
786 if (const Type *PT = getCurrentThisType().getTypePtrOrNull())
787 FoundDecl = PT->getPointeeType()->getAsTagDecl();
788 } else {
789 LookupResult BaseResult(*this, &Context.Idents.get(Base), SourceLocation(),
790 LookupOrdinaryName);
791 if (LookupName(BaseResult, getCurScope()) && BaseResult.isSingleResult())
792 FoundDecl = BaseResult.getFoundDecl();
793 }
794
795 if (!FoundDecl)
796 return true;
797
798 for (StringRef NextMember : Members) {
799 const RecordType *RT = nullptr;
800 if (VarDecl *VD = dyn_cast<VarDecl>(FoundDecl))
801 RT = VD->getType()->getAs<RecordType>();
802 else if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(FoundDecl)) {
803 MarkAnyDeclReferenced(TD->getLocation(), TD, /*OdrUse=*/false);
804 // MS InlineAsm often uses struct pointer aliases as a base
805 QualType QT = TD->getUnderlyingType();
806 if (const auto *PT = QT->getAs<PointerType>())
807 QT = PT->getPointeeType();
808 RT = QT->getAs<RecordType>();
809 } else if (TypeDecl *TD = dyn_cast<TypeDecl>(FoundDecl))
810 RT = TD->getTypeForDecl()->getAs<RecordType>();
811 else if (FieldDecl *TD = dyn_cast<FieldDecl>(FoundDecl))
812 RT = TD->getType()->getAs<RecordType>();
813 if (!RT)
814 return true;
815
816 if (RequireCompleteType(AsmLoc, QualType(RT, 0),
817 diag::err_asm_incomplete_type))
818 return true;
819
820 LookupResult FieldResult(*this, &Context.Idents.get(NextMember),
821 SourceLocation(), LookupMemberName);
822
823 if (!LookupQualifiedName(FieldResult, RT->getDecl()))
824 return true;
825
826 if (!FieldResult.isSingleResult())
827 return true;
828 FoundDecl = FieldResult.getFoundDecl();
829
830 // FIXME: Handle IndirectFieldDecl?
831 FieldDecl *FD = dyn_cast<FieldDecl>(FoundDecl);
832 if (!FD)
833 return true;
834
835 const ASTRecordLayout &RL = Context.getASTRecordLayout(RT->getDecl());
836 unsigned i = FD->getFieldIndex();
837 CharUnits Result = Context.toCharUnitsFromBits(RL.getFieldOffset(i));
838 Offset += (unsigned)Result.getQuantity();
839 }
840
841 return false;
842 }
843
844 ExprResult
845 Sema::LookupInlineAsmVarDeclField(Expr *E, StringRef Member,
846 SourceLocation AsmLoc) {
847
848 QualType T = E->getType();
849 if (T->isDependentType()) {
850 DeclarationNameInfo NameInfo;
851 NameInfo.setLoc(AsmLoc);
852 NameInfo.setName(&Context.Idents.get(Member));
853 return CXXDependentScopeMemberExpr::Create(
854 Context, E, T, /*IsArrow=*/false, AsmLoc, NestedNameSpecifierLoc(),
855 SourceLocation(),
856 /*FirstQualifierFoundInScope=*/nullptr, NameInfo, /*TemplateArgs=*/nullptr);
857 }
858
859 const RecordType *RT = T->getAs<RecordType>();
860 // FIXME: Diagnose this as field access into a scalar type.
861 if (!RT)
862 return ExprResult();
863
864 LookupResult FieldResult(*this, &Context.Idents.get(Member), AsmLoc,
865 LookupMemberName);
866
867 if (!LookupQualifiedName(FieldResult, RT->getDecl()))
868 return ExprResult();
869
870 // Only normal and indirect field results will work.
871 ValueDecl *FD = dyn_cast<FieldDecl>(FieldResult.getFoundDecl());
872 if (!FD)
873 FD = dyn_cast<IndirectFieldDecl>(FieldResult.getFoundDecl());
874 if (!FD)
875 return ExprResult();
876
877 // Make an Expr to thread through OpDecl.
878 ExprResult Result = BuildMemberReferenceExpr(
879 E, E->getType(), AsmLoc, /*IsArrow=*/false, CXXScopeSpec(),
880 SourceLocation(), nullptr, FieldResult, nullptr, nullptr);
881
882 return Result;
883 }
884
885 StmtResult Sema::ActOnMSAsmStmt(SourceLocation AsmLoc, SourceLocation LBraceLoc,
886 ArrayRef<Token> AsmToks,
887 StringRef AsmString,
888 unsigned NumOutputs, unsigned NumInputs,
889 ArrayRef<StringRef> Constraints,
890 ArrayRef<StringRef> Clobbers,
891 ArrayRef<Expr*> Exprs,
892 SourceLocation EndLoc) {
893 bool IsSimple = (NumOutputs != 0 || NumInputs != 0);
894 setFunctionHasBranchProtectedScope();
895 MSAsmStmt *NS =
896 new (Context) MSAsmStmt(Context, AsmLoc, LBraceLoc, IsSimple,
897 /*IsVolatile*/ true, AsmToks, NumOutputs, NumInputs,
898 Constraints, Exprs, AsmString,
899 Clobbers, EndLoc);
900 return NS;
901 }
902
903 LabelDecl *Sema::GetOrCreateMSAsmLabel(StringRef ExternalLabelName,
904 SourceLocation Location,
905 bool AlwaysCreate) {
906 LabelDecl* Label = LookupOrCreateLabel(PP.getIdentifierInfo(ExternalLabelName),
907 Location);
908
909 if (Label->isMSAsmLabel()) {
910 // If we have previously created this label implicitly, mark it as used.
911 Label->markUsed(Context);
912 } else {
913 // Otherwise, insert it, but only resolve it if we have seen the label itself.
914 std::string InternalName;
915 llvm::raw_string_ostream OS(InternalName);
916 // Create an internal name for the label. The name should not be a valid
917 // mangled name, and should be unique. We use a dot to make the name an
918 // invalid mangled name. We use LLVM's inline asm ${:uid} escape so that a
919 // unique label is generated each time this blob is emitted, even after
920 // inlining or LTO.
921 OS << "__MSASMLABEL_.${:uid}__";
922 for (char C : ExternalLabelName) {
923 OS << C;
924 // We escape '$' in asm strings by replacing it with "$$"
925 if (C == '$')
926 OS << '$';
927 }
928 Label->setMSAsmLabel(OS.str());
929 }
930 if (AlwaysCreate) {
931 // The label might have been created implicitly from a previously encountered
932 // goto statement. So, for both newly created and looked up labels, we mark
933 // them as resolved.
934 Label->setMSAsmLabelResolved();
935 }
936 // Adjust their location for being able to generate accurate diagnostics.
937 Label->setLocation(Location);
938
939 return Label;
940 }
clang::GCCAsmStmt
This represents a GCC inline-assembly statement extension.
Definition: Stmt.h:2878
clang::FunctionDecl
Represents a function declaration or definition.
Definition: Decl.h:1783
Diag
static DiagnosticBuilder Diag(DiagnosticsEngine *Diags, const LangOptions &Features, FullSourceLoc TokLoc, const char *TokBegin, const char *TokRangeBegin, const char *TokRangeEnd, unsigned DiagID)
Produce a diagnostic highlighting some portion of a literal.
Definition: LiteralSupport.cpp:77
clang::AsmStmt::getNumInputs
unsigned getNumInputs() const
Definition: Stmt.h:2790
clang::PointerType
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2614
clang::QualType
A (possibly-)qualified type.
Definition: Type.h:654
clang::Sema::FillInlineAsmIdentifierInfo
void FillInlineAsmIdentifierInfo(Expr *Res, llvm::InlineAsmIdentifierInfo &Info)
Definition: SemaStmtAsm.cpp:703
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:3023
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:557
clang::Type::isRealFloatingType
bool isRealFloatingType() const
Floating point categories.
Definition: Type.cpp:2021
clang::VarDecl::getStorageClass
StorageClass getStorageClass() const
Returns the storage class as written in the source.
Definition: Decl.h:1029
Base
clang::AsmStmt::getNumOutputs
unsigned getNumOutputs() const
Definition: Stmt.h:2768
clang::Expr::MLV_IncompleteType
Definition: Expr.h:285
clang::StringLiteral::isAscii
bool isAscii() const
Definition: Expr.h:1830
clang::Sema::Diag
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Emit a diagnostic.
Definition: Sema.h:1411
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:4074
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:1450
clang::TargetInfo::validateInputConstraint
bool validateInputConstraint(MutableArrayRef< ConstraintInfo > OutputConstraints, ConstraintInfo &info) const
Definition: TargetInfo.cpp:640
clang::ASTContext::getTargetInfo
const TargetInfo & getTargetInfo() const
Definition: ASTContext.h:707
clang::Expr::isModifiableLvalueResult
isModifiableLvalueResult
Definition: Expr.h:278
clang::GCCAsmStmt::setInputExpr
void setInputExpr(unsigned i, Expr *E)
Definition: Stmt.cpp:455
clang::VarDecl
Represents a variable declaration or definition.
Definition: Decl.h:820
clang::StmtResult
ActionResult< Stmt * > StmtResult
Definition: Ownership.h:264
clang::Expr::MLV_LValueCast
Definition: Expr.h:284
clang::Type::getAs
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:7002
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:535
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::IdentifierInfo
One of these records is kept for each identifier that is lexed.
Definition: IdentifierTable.h:57
clang::CharSourceRange::getBegin
SourceLocation getBegin() const
Definition: SourceLocation.h:280
clang::ASTContext
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:168
clang::NestedNameSpecifierLoc
A C++ nested-name-specifier augmented with source location information.
Definition: NestedNameSpecifier.h:236
clang::TargetInfo::getNormalizedGCCRegisterName
StringRef getNormalizedGCCRegisterName(StringRef Name, bool ReturnCanonical=false) const
Returns the "normalized" GCC register name.
Definition: TargetInfo.cpp:502
clang::TargetInfo::validateConstraintModifier
virtual bool validateConstraintModifier(StringRef, char, unsigned, std::string &) const
Definition: TargetInfo.h:960
clang::Stmt::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.cpp:275
clang::FieldDecl
Represents a member of a struct/union/class.
Definition: Decl.h:2729
clang::GCCAsmStmt::AsmStringPiece::getRange
CharSourceRange getRange() const
Definition: Stmt.h:2945
clang::DeclarationNameInfo::setName
void setName(DeclarationName N)
setName - Sets the embedded declaration name.
Definition: DeclarationName.h:716
ScopeInfo.h
clang::GCCAsmStmt::isAsmGoto
bool isAsmGoto() const
Definition: Stmt.h:3023
clang::CastExpr::getSubExpr
Expr * getSubExpr()
Definition: Expr.h:3202
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:580
clang::Sema::GetOrCreateMSAsmLabel
LabelDecl * GetOrCreateMSAsmLabel(StringRef ExternalLabelName, SourceLocation Location, bool AlwaysCreate)
Definition: SemaStmtAsm.cpp:903
clang::UnqualifiedId
Represents a C++ unqualified-id that has been parsed.
Definition: DeclSpec.h:960
clang::LookupResult
Represents the results of name lookup.
Definition: Lookup.h:46
clang::ActionResult::get
PtrTy get() const
Definition: Ownership.h:170
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:446
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:588
GlobalDecl.h
clang::Expr::getValueKind
ExprValueKind getValueKind() const
getValueKind - The value kind that this expression produces.
Definition: Expr.h:414
clang::Stmt::children
child_range children()
Definition: Stmt.cpp:224
clang::StmtError
StmtResult StmtError()
Definition: Ownership.h:280
clang::TypeDecl
Represents a declaration of a type.
Definition: Decl.h:3029
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:825
clang::GCCAsmStmt::getOutputExpr
Expr * getOutputExpr(unsigned i)
Definition: Stmt.cpp:440
clang::Expr::MLV_IncompleteVoidType
Definition: Expr.h:281
clang::Expr::MLV_ArrayType
Definition: Expr.h:289
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:3150
clang::Sema::getLangOpts
const LangOptions & getLangOpts() const
Definition: Sema.h:1324
clang::Expr::isTypeDependent
bool isTypeDependent() const
isTypeDependent - Determines whether this expression is type-dependent (C++ [temp.dep.expr]), which means that its type could change from one template instantiation to the next.
Definition: Expr.h:176
llvm::ArrayRef
Definition: LLVM.h:31
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:457
clang::Expr::IgnoreImpCasts
Expr * IgnoreImpCasts() LLVM_READONLY
Skip past any implicit casts which might surround this expression until reaching a fixed point...
Definition: Expr.cpp:2970
clang::GCCAsmStmt::AsmStringPiece::isOperand
bool isOperand() const
Definition: Stmt.h:2936
Parent
NodeId Parent
Definition: ASTDiff.cpp:191
clang::Sema::LookupInlineAsmIdentifier
ExprResult LookupInlineAsmIdentifier(CXXScopeSpec &SS, SourceLocation TemplateKWLoc, UnqualifiedId &Id, bool IsUnevaluatedContext)
Definition: SemaStmtAsm.cpp:729
clang::Decl::hasAttr
bool hasAttr() const
Definition: DeclBase.h:542
clang::Sema
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:336
clang::StringLiteral::getString
StringRef getString() const
Definition: Expr.h:1794
clang::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:449
clang::CastKind
CastKind
CastKind - The kind of operation required for a conversion.
Definition: OperationKinds.h:20
clang::Expr::EvaluateAsLValue
bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx, bool InConstantContext=false) const
EvaluateAsLValue - Evaluate an expression to see if we can fold it to an lvalue with link time known ...
Definition: ExprConstant.cpp:13809
clang::GCCAsmStmt::AsmStringPiece::getOperandNo
unsigned getOperandNo() const
Definition: Stmt.h:2940
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:1827
clang::ASTRecordLayout
ASTRecordLayout - This class contains layout information for one RecordDecl, which is a struct/union/...
Definition: RecordLayout.h:38
clang::TargetInfo
Exposes information about the current target.
Definition: TargetInfo.h:164
clang::ValueDecl
Represent the declaration of a variable (in which case it is an lvalue) a function (in which case it ...
Definition: Decl.h:619
clang::Expr
This represents one expression.
Definition: Expr.h:108
llvm::MutableArrayRef
Definition: LLVM.h:32
Label
std::string Label
Definition: UsingDeclarationsSorter.cpp:69
Id
int Id
Definition: ASTDiff.cpp:190
clang::CPlusPlus
Definition: LangStandard.h:47
clang::GCCAsmStmt::AsmStringPiece
AsmStringPiece - this is part of a decomposed asm string specification (for use with the AnalyzeAsmSt...
Definition: Stmt.h:2913
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:1446
Scope.h
TypeLoc.h
Defines the clang::TypeLoc interface and its subclasses.
clang::Expr::getType
QualType getType() const
Definition: Expr.h:137
clang::Expr::setValueKind
void setValueKind(ExprValueKind Cat)
setValueKind - Set the value kind produced by this expression.
Definition: Expr.h:431
clang::BaseResult
ActionResult< CXXBaseSpecifier * > BaseResult
Definition: Ownership.h:266
clang::MSAsmStmt
This represents a Microsoft inline-assembly statement extension.
Definition: Stmt.h:3101
clang::ActionResult::isInvalid
bool isInvalid() const
Definition: Ownership.h:166
clang::Decl::setLocation
void setLocation(SourceLocation L)
Definition: DeclBase.h:430
clang::ActionResult::isUsable
bool isUsable() const
Definition: Ownership.h:167
clang::TargetInfo::ConstraintInfo
Definition: TargetInfo.h:830
clang::RecordType::getDecl
RecordDecl * getDecl() const
Definition: Type.h:4505
clang::ASTRecordLayout::getFieldOffset
uint64_t getFieldOffset(unsigned FieldNo) const
getFieldOffset - Get the offset of the given field index, in bits.
Definition: RecordLayout.h:190
clang::TargetInfo::validateInputSize
virtual bool validateInputSize(const llvm::StringMap< bool > &FeatureMap, StringRef, unsigned) const
Definition: TargetInfo.h:954
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:13752
clang::ActionResult
ActionResult - This structure is used while parsing/acting on expressions, stmts, etc...
Definition: Ownership.h:153
clang::Expr::EvalResult::isGlobalLValue
bool isGlobalLValue() const
Definition: ExprConstant.cpp:14005
clang::SourceLocation
Encodes a location in the source.
Definition: SourceLocation.h:86
clang::IdentifierTable::get
IdentifierInfo & get(StringRef Name)
Return the identifier token info for the specified named identifier.
Definition: IdentifierTable.h:529
extractRegisterName
static StringRef extractRegisterName(const Expr *Expression, const TargetInfo &Target)
Definition: SemaStmtAsm.cpp:192
APSInt
llvm::APSInt APSInt
Definition: ByteCodeEmitter.cpp:18
clang::Sema::LookupInlineAsmVarDeclField
ExprResult LookupInlineAsmVarDeclField(Expr *RefExpr, StringRef Member, SourceLocation AsmLoc)
Definition: SemaStmtAsm.cpp:845
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, unsigned NumLabels, SourceLocation RParenLoc)
Definition: SemaStmtAsm.cpp:241
clang::LabelDecl
Represents the declaration of a label.
Definition: Decl.h:451
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:2938
Initialization.h
clang::ASTContext::getAsArrayType
const ArrayType * getAsArrayType(QualType T) const
Type Query functions.
Definition: ASTContext.cpp:5711
clang::TargetInfo::validateOutputConstraint
bool validateOutputConstraint(ConstraintInfo &Info) const
Definition: TargetInfo.cpp:543
clang::Expr::isValueDependent
bool isValueDependent() const
isValueDependent - Determines whether this expression is value-dependent (C++ [temp.dep.constexpr]).
Definition: Expr.h:158
clang::StringLiteral::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.h:1886
llvm::SmallVector
Definition: LLVM.h:35
clang::LabelDecl::isMSAsmLabel
bool isMSAsmLabel() const
Definition: Decl.h:485
clang::Sema::LookupInlineAsmField
bool LookupInlineAsmField(StringRef Base, StringRef Member, unsigned &Offset, SourceLocation AsmLoc)
Definition: SemaStmtAsm.cpp:776
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:258
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:679
clang::Expr::refersToVectorElement
bool refersToVectorElement() const
Returns whether this expression refers to a vector element.
Definition: Expr.cpp:3942
clang::GCCAsmStmt::getInputExpr
Expr * getInputExpr(unsigned i)
Definition: Stmt.cpp:451
clang::IdentifierInfo::getName
StringRef getName() const
Return the actual identifier string.
Definition: IdentifierTable.h:155
clang::TypedefNameDecl
Base class for declarations which introduce a typedef-name.
Definition: Decl.h:3071
clang
Dataflow Directional Tag Classes.
Definition: CFGReachabilityAnalysis.h:21
clang::SourceLocation::isValid
bool isValid() const
Return true if this is a valid SourceLocation object.
Definition: SourceLocation.h:106
clang::Expr::EvalResult
EvalResult is a struct with detailed info about an evaluated expression.
Definition: Expr.h:586
getName
static std::string getName(const CallEvent &Call)
Definition: ReturnValueChecker.cpp:60
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:885
clang::IndirectFieldDecl
Represents a field injected from an anonymous union/struct into the parent scope. ...
Definition: Decl.h:2980
clang::CastExpr::setSubExpr
void setSubExpr(Expr *E)
Definition: Expr.h:3204
clang::Type::isBooleanType
bool isBooleanType() const
Definition: Type.h:6894
clang::GCCAsmStmt::AsmStringPiece::getModifier
char getModifier() const
getModifier - Get the modifier for this operand, if present.
Definition: Stmt.cpp:431
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:875
clang::APValue::toIntegralConstant
bool toIntegralConstant(APSInt &Result, QualType SrcTy, const ASTContext &Ctx) const
Try to convert this value to an integral constant.
Definition: APValue.cpp:713
clang::DeclarationNameInfo
DeclarationNameInfo - A collector data type for bundling together a DeclarationName and the correspnd...
Definition: DeclarationName.h:690
clang::TargetInfo::ConstraintInfo::getConstraintStr
const std::string & getConstraintStr() const
Definition: TargetInfo.h:859
clang::RecordType
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4495
clang::Type::isIntegerType
bool isIntegerType() const
isIntegerType() does not include complex integers (a GCC extension).
Definition: Type.h:6811
clang::Decl::getAttr
T * getAttr() const
Definition: DeclBase.h:538
clang::Type::isFunctionType
bool isFunctionType() const
Definition: Type.h:6500
clang::TargetInfo::ConstraintInfo::getTiedOperand
unsigned getTiedOperand() const
Definition: TargetInfo.h:876
clang::ASTContext::hasSameType
bool hasSameType(QualType T1, QualType T2) const
Determine whether the given types T1 and T2 are equivalent.
Definition: ASTContext.h:2321
clang::Decl::markUsed
void markUsed(ASTContext &C)
Mark the declaration used, in the sense of odr-use.
Definition: DeclBase.cpp:413
clang::ASTContext::getTypeSize
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:2104
clang::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:2115
clang::DeclarationNameInfo::setLoc
void setLoc(SourceLocation L)
setLoc - Sets the main location of the declaration name.
Definition: DeclarationName.h:722
clang::ASTContext::toCharUnitsFromBits
CharUnits toCharUnitsFromBits(int64_t BitSize) const
Convert a size in bits to a size in characters.
Definition: ASTContext.cpp:2372
clang::Expr::refersToGlobalRegisterVar
bool refersToGlobalRegisterVar() const
Returns whether this expression refers to a global register variable.
Definition: Expr.cpp:3968
clang::ExprResult
ActionResult< Expr * > ExprResult
Definition: Ownership.h:263
clang::Type::isVoidType
bool isVoidType() const
Definition: Type.h:6777
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:4666
clang::Sema::CurContext
DeclContext * CurContext
CurContext - This is the current declaration context of parsing.
Definition: Sema.h:397
clang::Expr::isRValue
bool isRValue() const
Definition: Expr.h:259
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::ASTContext::getFunctionFeatureMap
void getFunctionFeatureMap(llvm::StringMap< bool > &FeatureMap, const FunctionDecl *) const
Definition: ASTContext.cpp:10940
clang::Stmt::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:263
clang::StringLiteral
StringLiteral - This represents a string literal expression, e.g.
Definition: Expr.h:1711
TargetInfo.h
Defines the clang::TargetInfo interface.
clang::Expr::MLV_Valid
Definition: Expr.h:279
clang::ExprError
ExprResult ExprError()
Definition: Ownership.h:279
clang::SC_Register
Definition: Specifiers.h:244
clang::Type::isDependentType
bool isDependentType() const
Whether this type is a dependent type, meaning that its definition somehow depends on a template para...
Definition: Type.h:2150
clang::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:13946
clang::DeclRefExpr
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:1171
clang::Type::isPointerType
bool isPointerType() const
Definition: Type.h:6504
clang::ASTContext::getTypeSizeInChars
CharUnits getTypeSizeInChars(QualType T) const
Return the size of the specified (complete) type T, in characters.
Definition: ASTContext.cpp:2383
clang::LabelDecl::setMSAsmLabelResolved
void setMSAsmLabelResolved()
Definition: Decl.h:489
clang::TargetInfo::validateOutputSize
virtual bool validateOutputSize(const llvm::StringMap< bool > &FeatureMap, StringRef, unsigned) const
Definition: TargetInfo.h:948
clang::Sema::Context
ASTContext & Context
Definition: Sema.h:385
clang::NamedDecl
This represents a decl that may have a name.
Definition: Decl.h:223
clang::APValue::getInt
APSInt & getInt()
Definition: APValue.h:380
clang::Expr::IgnoreParenNoopCasts
Expr * IgnoreParenNoopCasts(const ASTContext &Ctx) LLVM_READONLY
Skip past any parenthese and casts which do not change the value (including ptr->int casts of the sam...
Definition: Expr.cpp:3017
getClobberConflictLocation
static SourceLocation getClobberConflictLocation(MultiExprArg Exprs, StringLiteral **Constraints, StringLiteral **Clobbers, int NumClobbers, unsigned NumLabels, const TargetInfo &Target, ASTContext &Cont)
Definition: SemaStmtAsm.cpp:211
clang::Attr
Attr - This represents one attribute.
Definition: Attr.h:45