1 //===--- SemaStmtAsm.cpp - Semantic Analysis for Asm Statements -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements semantic analysis for inline asm statements.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Sema/SemaInternal.h"
15 #include "clang/AST/ExprCXX.h"
16 #include "clang/AST/RecordLayout.h"
17 #include "clang/AST/TypeLoc.h"
18 #include "clang/Basic/TargetInfo.h"
19 #include "clang/Lex/Preprocessor.h"
20 #include "clang/Sema/Initialization.h"
21 #include "clang/Sema/Lookup.h"
22 #include "clang/Sema/Scope.h"
23 #include "clang/Sema/ScopeInfo.h"
24 #include "llvm/ADT/ArrayRef.h"
25 #include "llvm/ADT/BitVector.h"
26 #include "llvm/MC/MCParser/MCAsmParser.h"
27 using namespace clang;
30 /// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently
31 /// ignore "noop" casts in places where an lvalue is required by an inline asm.
32 /// We emulate this behavior when -fheinous-gnu-extensions is specified, but
33 /// provide a strong guidance to not use it.
35 /// This method checks to see if the argument is an acceptable l-value and
36 /// returns false if it is a case we can handle.
37 static bool CheckAsmLValue(const Expr *E, Sema &S) {
38 // Type dependent expressions will be checked during instantiation.
39 if (E->isTypeDependent())
43 return false; // Cool, this is an lvalue.
45 // Okay, this is not an lvalue, but perhaps it is the result of a cast that we
46 // are supposed to allow.
47 const Expr *E2 = E->IgnoreParenNoopCasts(S.Context);
48 if (E != E2 && E2->isLValue()) {
49 if (!S.getLangOpts().HeinousExtensions)
50 S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue)
51 << E->getSourceRange();
53 S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue)
54 << E->getSourceRange();
55 // Accept, even if we emitted an error diagnostic.
59 // None of the above, just randomly invalid non-lvalue.
63 /// isOperandMentioned - Return true if the specified operand # is mentioned
64 /// anywhere in the decomposed asm string.
65 static bool isOperandMentioned(unsigned OpNo,
66 ArrayRef<GCCAsmStmt::AsmStringPiece> AsmStrPieces) {
67 for (unsigned p = 0, e = AsmStrPieces.size(); p != e; ++p) {
68 const GCCAsmStmt::AsmStringPiece &Piece = AsmStrPieces[p];
69 if (!Piece.isOperand()) continue;
71 // If this is a reference to the input and if the input was the smaller
72 // one, then we have to reject this asm.
73 if (Piece.getOperandNo() == OpNo)
79 static bool CheckNakedParmReference(Expr *E, Sema &S) {
80 FunctionDecl *Func = dyn_cast<FunctionDecl>(S.CurContext);
83 if (!Func->hasAttr<NakedAttr>())
86 SmallVector<Expr*, 4> WorkList;
87 WorkList.push_back(E);
88 while (WorkList.size()) {
89 Expr *E = WorkList.pop_back_val();
90 if (isa<CXXThisExpr>(E)) {
91 S.Diag(E->getLocStart(), diag::err_asm_naked_this_ref);
92 S.Diag(Func->getAttr<NakedAttr>()->getLocation(), diag::note_attribute);
95 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
96 if (isa<ParmVarDecl>(DRE->getDecl())) {
97 S.Diag(DRE->getLocStart(), diag::err_asm_naked_parm_ref);
98 S.Diag(Func->getAttr<NakedAttr>()->getLocation(), diag::note_attribute);
102 for (Stmt *Child : E->children()) {
103 if (Expr *E = dyn_cast_or_null<Expr>(Child))
104 WorkList.push_back(E);
110 /// \brief Returns true if given expression is not compatible with inline
111 /// assembly's memory constraint; false otherwise.
112 static bool checkExprMemoryConstraintCompat(Sema &S, Expr *E,
113 TargetInfo::ConstraintInfo &Info,
114 bool is_input_expr) {
120 } EType = ExprSafeType;
122 // Bitfields, vector elements and global register variables are not
124 if (E->refersToBitField())
125 EType = ExprBitfield;
126 else if (E->refersToVectorElement())
127 EType = ExprVectorElt;
128 else if (E->refersToGlobalRegisterVar())
129 EType = ExprGlobalRegVar;
131 if (EType != ExprSafeType) {
132 S.Diag(E->getLocStart(), diag::err_asm_non_addr_value_in_memory_constraint)
133 << EType << is_input_expr << Info.getConstraintStr()
134 << E->getSourceRange();
141 StmtResult Sema::ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
142 bool IsVolatile, unsigned NumOutputs,
143 unsigned NumInputs, IdentifierInfo **Names,
144 MultiExprArg constraints, MultiExprArg Exprs,
145 Expr *asmString, MultiExprArg clobbers,
146 SourceLocation RParenLoc) {
147 unsigned NumClobbers = clobbers.size();
148 StringLiteral **Constraints =
149 reinterpret_cast<StringLiteral**>(constraints.data());
150 StringLiteral *AsmString = cast<StringLiteral>(asmString);
151 StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.data());
153 SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos;
155 // The parser verifies that there is a string literal here.
156 assert(AsmString->isAscii());
158 // If we're compiling CUDA file and function attributes indicate that it's not
159 // for this compilation side, skip all the checks.
160 if (!DeclAttrsMatchCUDAMode(getLangOpts(), getCurFunctionDecl())) {
161 GCCAsmStmt *NS = new (Context) GCCAsmStmt(
162 Context, AsmLoc, IsSimple, IsVolatile, NumOutputs, NumInputs, Names,
163 Constraints, Exprs.data(), AsmString, NumClobbers, Clobbers, RParenLoc);
167 for (unsigned i = 0; i != NumOutputs; i++) {
168 StringLiteral *Literal = Constraints[i];
169 assert(Literal->isAscii());
171 StringRef OutputName;
173 OutputName = Names[i]->getName();
175 TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName);
176 if (!Context.getTargetInfo().validateOutputConstraint(Info))
177 return StmtError(Diag(Literal->getLocStart(),
178 diag::err_asm_invalid_output_constraint)
179 << Info.getConstraintStr());
181 ExprResult ER = CheckPlaceholderExpr(Exprs[i]);
186 // Check that the output exprs are valid lvalues.
187 Expr *OutputExpr = Exprs[i];
189 // Referring to parameters is not allowed in naked functions.
190 if (CheckNakedParmReference(OutputExpr, *this))
193 // Check that the output expression is compatible with memory constraint.
194 if (Info.allowsMemory() &&
195 checkExprMemoryConstraintCompat(*this, OutputExpr, Info, false))
198 OutputConstraintInfos.push_back(Info);
200 // If this is dependent, just continue.
201 if (OutputExpr->isTypeDependent())
204 Expr::isModifiableLvalueResult IsLV =
205 OutputExpr->isModifiableLvalue(Context, /*Loc=*/nullptr);
207 case Expr::MLV_Valid:
208 // Cool, this is an lvalue.
210 case Expr::MLV_ArrayType:
213 case Expr::MLV_LValueCast: {
214 const Expr *LVal = OutputExpr->IgnoreParenNoopCasts(Context);
215 if (!getLangOpts().HeinousExtensions) {
216 Diag(LVal->getLocStart(), diag::err_invalid_asm_cast_lvalue)
217 << OutputExpr->getSourceRange();
219 Diag(LVal->getLocStart(), diag::warn_invalid_asm_cast_lvalue)
220 << OutputExpr->getSourceRange();
222 // Accept, even if we emitted an error diagnostic.
225 case Expr::MLV_IncompleteType:
226 case Expr::MLV_IncompleteVoidType:
227 if (RequireCompleteType(OutputExpr->getLocStart(), Exprs[i]->getType(),
228 diag::err_dereference_incomplete_type))
231 return StmtError(Diag(OutputExpr->getLocStart(),
232 diag::err_asm_invalid_lvalue_in_output)
233 << OutputExpr->getSourceRange());
236 unsigned Size = Context.getTypeSize(OutputExpr->getType());
237 if (!Context.getTargetInfo().validateOutputSize(Literal->getString(),
239 return StmtError(Diag(OutputExpr->getLocStart(),
240 diag::err_asm_invalid_output_size)
241 << Info.getConstraintStr());
244 SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos;
246 for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) {
247 StringLiteral *Literal = Constraints[i];
248 assert(Literal->isAscii());
252 InputName = Names[i]->getName();
254 TargetInfo::ConstraintInfo Info(Literal->getString(), InputName);
255 if (!Context.getTargetInfo().validateInputConstraint(OutputConstraintInfos,
257 return StmtError(Diag(Literal->getLocStart(),
258 diag::err_asm_invalid_input_constraint)
259 << Info.getConstraintStr());
262 ExprResult ER = CheckPlaceholderExpr(Exprs[i]);
267 Expr *InputExpr = Exprs[i];
269 // Referring to parameters is not allowed in naked functions.
270 if (CheckNakedParmReference(InputExpr, *this))
273 // Check that the input expression is compatible with memory constraint.
274 if (Info.allowsMemory() &&
275 checkExprMemoryConstraintCompat(*this, InputExpr, Info, true))
278 // Only allow void types for memory constraints.
279 if (Info.allowsMemory() && !Info.allowsRegister()) {
280 if (CheckAsmLValue(InputExpr, *this))
281 return StmtError(Diag(InputExpr->getLocStart(),
282 diag::err_asm_invalid_lvalue_in_input)
283 << Info.getConstraintStr()
284 << InputExpr->getSourceRange());
285 } else if (Info.requiresImmediateConstant() && !Info.allowsRegister()) {
286 if (!InputExpr->isValueDependent()) {
288 if (!InputExpr->EvaluateAsInt(Result, Context))
290 Diag(InputExpr->getLocStart(), diag::err_asm_immediate_expected)
291 << Info.getConstraintStr() << InputExpr->getSourceRange());
292 if (!Info.isValidAsmImmediate(Result))
293 return StmtError(Diag(InputExpr->getLocStart(),
294 diag::err_invalid_asm_value_for_constraint)
295 << Result.toString(10) << Info.getConstraintStr()
296 << InputExpr->getSourceRange());
300 ExprResult Result = DefaultFunctionArrayLvalueConversion(Exprs[i]);
301 if (Result.isInvalid())
304 Exprs[i] = Result.get();
307 if (Info.allowsRegister()) {
308 if (InputExpr->getType()->isVoidType()) {
309 return StmtError(Diag(InputExpr->getLocStart(),
310 diag::err_asm_invalid_type_in_input)
311 << InputExpr->getType() << Info.getConstraintStr()
312 << InputExpr->getSourceRange());
316 InputConstraintInfos.push_back(Info);
318 const Type *Ty = Exprs[i]->getType().getTypePtr();
319 if (Ty->isDependentType())
322 if (!Ty->isVoidType() || !Info.allowsMemory())
323 if (RequireCompleteType(InputExpr->getLocStart(), Exprs[i]->getType(),
324 diag::err_dereference_incomplete_type))
327 unsigned Size = Context.getTypeSize(Ty);
328 if (!Context.getTargetInfo().validateInputSize(Literal->getString(),
330 return StmtError(Diag(InputExpr->getLocStart(),
331 diag::err_asm_invalid_input_size)
332 << Info.getConstraintStr());
335 // Check that the clobbers are valid.
336 for (unsigned i = 0; i != NumClobbers; i++) {
337 StringLiteral *Literal = Clobbers[i];
338 assert(Literal->isAscii());
340 StringRef Clobber = Literal->getString();
342 if (!Context.getTargetInfo().isValidClobber(Clobber))
343 return StmtError(Diag(Literal->getLocStart(),
344 diag::err_asm_unknown_register_name) << Clobber);
348 new (Context) GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
349 NumInputs, Names, Constraints, Exprs.data(),
350 AsmString, NumClobbers, Clobbers, RParenLoc);
351 // Validate the asm string, ensuring it makes sense given the operands we
353 SmallVector<GCCAsmStmt::AsmStringPiece, 8> Pieces;
355 if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) {
356 Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID)
357 << AsmString->getSourceRange();
361 // Validate constraints and modifiers.
362 for (unsigned i = 0, e = Pieces.size(); i != e; ++i) {
363 GCCAsmStmt::AsmStringPiece &Piece = Pieces[i];
364 if (!Piece.isOperand()) continue;
366 // Look for the correct constraint index.
367 unsigned ConstraintIdx = Piece.getOperandNo();
368 unsigned NumOperands = NS->getNumOutputs() + NS->getNumInputs();
370 // Look for the (ConstraintIdx - NumOperands + 1)th constraint with
372 if (ConstraintIdx >= NumOperands) {
373 unsigned I = 0, E = NS->getNumOutputs();
375 for (unsigned Cnt = ConstraintIdx - NumOperands; I != E; ++I)
376 if (OutputConstraintInfos[I].isReadWrite() && Cnt-- == 0) {
381 assert(I != E && "Invalid operand number should have been caught in "
382 " AnalyzeAsmString");
385 // Now that we have the right indexes go ahead and check.
386 StringLiteral *Literal = Constraints[ConstraintIdx];
387 const Type *Ty = Exprs[ConstraintIdx]->getType().getTypePtr();
388 if (Ty->isDependentType() || Ty->isIncompleteType())
391 unsigned Size = Context.getTypeSize(Ty);
392 std::string SuggestedModifier;
393 if (!Context.getTargetInfo().validateConstraintModifier(
394 Literal->getString(), Piece.getModifier(), Size,
395 SuggestedModifier)) {
396 Diag(Exprs[ConstraintIdx]->getLocStart(),
397 diag::warn_asm_mismatched_size_modifier);
399 if (!SuggestedModifier.empty()) {
400 auto B = Diag(Piece.getRange().getBegin(),
401 diag::note_asm_missing_constraint_modifier)
402 << SuggestedModifier;
403 SuggestedModifier = "%" + SuggestedModifier + Piece.getString();
404 B.AddFixItHint(FixItHint::CreateReplacement(Piece.getRange(),
410 // Validate tied input operands for type mismatches.
411 unsigned NumAlternatives = ~0U;
412 for (unsigned i = 0, e = OutputConstraintInfos.size(); i != e; ++i) {
413 TargetInfo::ConstraintInfo &Info = OutputConstraintInfos[i];
414 StringRef ConstraintStr = Info.getConstraintStr();
415 unsigned AltCount = ConstraintStr.count(',') + 1;
416 if (NumAlternatives == ~0U)
417 NumAlternatives = AltCount;
418 else if (NumAlternatives != AltCount)
419 return StmtError(Diag(NS->getOutputExpr(i)->getLocStart(),
420 diag::err_asm_unexpected_constraint_alternatives)
421 << NumAlternatives << AltCount);
423 SmallVector<size_t, 4> InputMatchedToOutput(OutputConstraintInfos.size(),
425 for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) {
426 TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i];
427 StringRef ConstraintStr = Info.getConstraintStr();
428 unsigned AltCount = ConstraintStr.count(',') + 1;
429 if (NumAlternatives == ~0U)
430 NumAlternatives = AltCount;
431 else if (NumAlternatives != AltCount)
432 return StmtError(Diag(NS->getInputExpr(i)->getLocStart(),
433 diag::err_asm_unexpected_constraint_alternatives)
434 << NumAlternatives << AltCount);
436 // If this is a tied constraint, verify that the output and input have
437 // either exactly the same type, or that they are int/ptr operands with the
438 // same size (int/long, int*/long, are ok etc).
439 if (!Info.hasTiedOperand()) continue;
441 unsigned TiedTo = Info.getTiedOperand();
442 unsigned InputOpNo = i+NumOutputs;
443 Expr *OutputExpr = Exprs[TiedTo];
444 Expr *InputExpr = Exprs[InputOpNo];
446 // Make sure no more than one input constraint matches each output.
447 assert(TiedTo < InputMatchedToOutput.size() && "TiedTo value out of range");
448 if (InputMatchedToOutput[TiedTo] != ~0U) {
449 Diag(NS->getInputExpr(i)->getLocStart(),
450 diag::err_asm_input_duplicate_match)
452 Diag(NS->getInputExpr(InputMatchedToOutput[TiedTo])->getLocStart(),
453 diag::note_asm_input_duplicate_first)
457 InputMatchedToOutput[TiedTo] = i;
459 if (OutputExpr->isTypeDependent() || InputExpr->isTypeDependent())
462 QualType InTy = InputExpr->getType();
463 QualType OutTy = OutputExpr->getType();
464 if (Context.hasSameType(InTy, OutTy))
465 continue; // All types can be tied to themselves.
467 // Decide if the input and output are in the same domain (integer/ptr or
470 AD_Int, AD_FP, AD_Other
471 } InputDomain, OutputDomain;
473 if (InTy->isIntegerType() || InTy->isPointerType())
474 InputDomain = AD_Int;
475 else if (InTy->isRealFloatingType())
478 InputDomain = AD_Other;
480 if (OutTy->isIntegerType() || OutTy->isPointerType())
481 OutputDomain = AD_Int;
482 else if (OutTy->isRealFloatingType())
483 OutputDomain = AD_FP;
485 OutputDomain = AD_Other;
487 // They are ok if they are the same size and in the same domain. This
488 // allows tying things like:
490 // void* to int if they are the same size.
491 // double to long double if they are the same size.
493 uint64_t OutSize = Context.getTypeSize(OutTy);
494 uint64_t InSize = Context.getTypeSize(InTy);
495 if (OutSize == InSize && InputDomain == OutputDomain &&
496 InputDomain != AD_Other)
499 // If the smaller input/output operand is not mentioned in the asm string,
500 // then we can promote the smaller one to a larger input and the asm string
502 bool SmallerValueMentioned = false;
504 // If this is a reference to the input and if the input was the smaller
505 // one, then we have to reject this asm.
506 if (isOperandMentioned(InputOpNo, Pieces)) {
507 // This is a use in the asm string of the smaller operand. Since we
508 // codegen this by promoting to a wider value, the asm will get printed
510 SmallerValueMentioned |= InSize < OutSize;
512 if (isOperandMentioned(TiedTo, Pieces)) {
513 // If this is a reference to the output, and if the output is the larger
514 // value, then it's ok because we'll promote the input to the larger type.
515 SmallerValueMentioned |= OutSize < InSize;
518 // If the smaller value wasn't mentioned in the asm string, and if the
519 // output was a register, just extend the shorter one to the size of the
521 if (!SmallerValueMentioned && InputDomain != AD_Other &&
522 OutputConstraintInfos[TiedTo].allowsRegister())
525 // Either both of the operands were mentioned or the smaller one was
526 // mentioned. One more special case that we'll allow: if the tied input is
527 // integer, unmentioned, and is a constant, then we'll allow truncating it
528 // down to the size of the destination.
529 if (InputDomain == AD_Int && OutputDomain == AD_Int &&
530 !isOperandMentioned(InputOpNo, Pieces) &&
531 InputExpr->isEvaluatable(Context)) {
533 (OutTy->isBooleanType() ? CK_IntegralToBoolean : CK_IntegralCast);
534 InputExpr = ImpCastExprToType(InputExpr, OutTy, castKind).get();
535 Exprs[InputOpNo] = InputExpr;
536 NS->setInputExpr(i, InputExpr);
540 Diag(InputExpr->getLocStart(),
541 diag::err_asm_tying_incompatible_types)
542 << InTy << OutTy << OutputExpr->getSourceRange()
543 << InputExpr->getSourceRange();
550 static void fillInlineAsmTypeInfo(const ASTContext &Context, QualType T,
551 llvm::InlineAsmIdentifierInfo &Info) {
552 // Compute the type size (and array length if applicable?).
553 Info.Type = Info.Size = Context.getTypeSizeInChars(T).getQuantity();
554 if (T->isArrayType()) {
555 const ArrayType *ATy = Context.getAsArrayType(T);
556 Info.Type = Context.getTypeSizeInChars(ATy->getElementType()).getQuantity();
557 Info.Length = Info.Size / Info.Type;
561 ExprResult Sema::LookupInlineAsmIdentifier(CXXScopeSpec &SS,
562 SourceLocation TemplateKWLoc,
564 llvm::InlineAsmIdentifierInfo &Info,
565 bool IsUnevaluatedContext) {
568 if (IsUnevaluatedContext)
569 PushExpressionEvaluationContext(UnevaluatedAbstract,
570 ReuseLambdaContextDecl);
572 ExprResult Result = ActOnIdExpression(getCurScope(), SS, TemplateKWLoc, Id,
573 /*trailing lparen*/ false,
574 /*is & operand*/ false,
575 /*CorrectionCandidateCallback=*/nullptr,
576 /*IsInlineAsmIdentifier=*/ true);
578 if (IsUnevaluatedContext)
579 PopExpressionEvaluationContext();
581 if (!Result.isUsable()) return Result;
583 Result = CheckPlaceholderExpr(Result.get());
584 if (!Result.isUsable()) return Result;
586 // Referring to parameters is not allowed in naked functions.
587 if (CheckNakedParmReference(Result.get(), *this))
590 QualType T = Result.get()->getType();
592 if (T->isDependentType()) {
596 // Any sort of function type is fine.
597 if (T->isFunctionType()) {
601 // Otherwise, it needs to be a complete type.
602 if (RequireCompleteExprType(Result.get(), diag::err_asm_incomplete_type)) {
606 fillInlineAsmTypeInfo(Context, T, Info);
608 // We can work with the expression as long as it's not an r-value.
609 if (!Result.get()->isRValue())
610 Info.IsVarDecl = true;
615 bool Sema::LookupInlineAsmField(StringRef Base, StringRef Member,
616 unsigned &Offset, SourceLocation AsmLoc) {
618 SmallVector<StringRef, 2> Members;
619 Member.split(Members, ".");
621 LookupResult BaseResult(*this, &Context.Idents.get(Base), SourceLocation(),
624 if (!LookupName(BaseResult, getCurScope()))
627 LookupResult CurrBaseResult(BaseResult);
629 for (StringRef NextMember : Members) {
631 if (!CurrBaseResult.isSingleResult())
634 const RecordType *RT = nullptr;
635 NamedDecl *FoundDecl = CurrBaseResult.getFoundDecl();
636 if (VarDecl *VD = dyn_cast<VarDecl>(FoundDecl))
637 RT = VD->getType()->getAs<RecordType>();
638 else if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(FoundDecl)) {
639 MarkAnyDeclReferenced(TD->getLocation(), TD, /*OdrUse=*/false);
640 RT = TD->getUnderlyingType()->getAs<RecordType>();
641 } else if (TypeDecl *TD = dyn_cast<TypeDecl>(FoundDecl))
642 RT = TD->getTypeForDecl()->getAs<RecordType>();
643 else if (FieldDecl *TD = dyn_cast<FieldDecl>(FoundDecl))
644 RT = TD->getType()->getAs<RecordType>();
648 if (RequireCompleteType(AsmLoc, QualType(RT, 0),
649 diag::err_asm_incomplete_type))
652 LookupResult FieldResult(*this, &Context.Idents.get(NextMember),
653 SourceLocation(), LookupMemberName);
655 if (!LookupQualifiedName(FieldResult, RT->getDecl()))
658 // FIXME: Handle IndirectFieldDecl?
659 FieldDecl *FD = dyn_cast<FieldDecl>(FieldResult.getFoundDecl());
663 CurrBaseResult = FieldResult;
665 const ASTRecordLayout &RL = Context.getASTRecordLayout(RT->getDecl());
666 unsigned i = FD->getFieldIndex();
667 CharUnits Result = Context.toCharUnitsFromBits(RL.getFieldOffset(i));
668 Offset += (unsigned)Result.getQuantity();
675 Sema::LookupInlineAsmVarDeclField(Expr *E, StringRef Member,
676 llvm::InlineAsmIdentifierInfo &Info,
677 SourceLocation AsmLoc) {
680 QualType T = E->getType();
681 if (T->isDependentType()) {
682 DeclarationNameInfo NameInfo;
683 NameInfo.setLoc(AsmLoc);
684 NameInfo.setName(&Context.Idents.get(Member));
685 return CXXDependentScopeMemberExpr::Create(
686 Context, E, T, /*IsArrow=*/false, AsmLoc, NestedNameSpecifierLoc(),
688 /*FirstQualifierInScope=*/nullptr, NameInfo, /*TemplateArgs=*/nullptr);
691 const RecordType *RT = T->getAs<RecordType>();
692 // FIXME: Diagnose this as field access into a scalar type.
696 LookupResult FieldResult(*this, &Context.Idents.get(Member), AsmLoc,
699 if (!LookupQualifiedName(FieldResult, RT->getDecl()))
702 // Only normal and indirect field results will work.
703 ValueDecl *FD = dyn_cast<FieldDecl>(FieldResult.getFoundDecl());
705 FD = dyn_cast<IndirectFieldDecl>(FieldResult.getFoundDecl());
709 // Make an Expr to thread through OpDecl.
710 ExprResult Result = BuildMemberReferenceExpr(
711 E, E->getType(), AsmLoc, /*IsArrow=*/false, CXXScopeSpec(),
712 SourceLocation(), nullptr, FieldResult, nullptr, nullptr);
713 if (Result.isInvalid())
715 Info.OpDecl = Result.get();
717 fillInlineAsmTypeInfo(Context, Result.get()->getType(), Info);
719 // Fields are "variables" as far as inline assembly is concerned.
720 Info.IsVarDecl = true;
725 StmtResult Sema::ActOnMSAsmStmt(SourceLocation AsmLoc, SourceLocation LBraceLoc,
726 ArrayRef<Token> AsmToks,
728 unsigned NumOutputs, unsigned NumInputs,
729 ArrayRef<StringRef> Constraints,
730 ArrayRef<StringRef> Clobbers,
731 ArrayRef<Expr*> Exprs,
732 SourceLocation EndLoc) {
733 bool IsSimple = (NumOutputs != 0 || NumInputs != 0);
734 getCurFunction()->setHasBranchProtectedScope();
736 new (Context) MSAsmStmt(Context, AsmLoc, LBraceLoc, IsSimple,
737 /*IsVolatile*/ true, AsmToks, NumOutputs, NumInputs,
738 Constraints, Exprs, AsmString,
743 LabelDecl *Sema::GetOrCreateMSAsmLabel(StringRef ExternalLabelName,
744 SourceLocation Location,
746 LabelDecl* Label = LookupOrCreateLabel(PP.getIdentifierInfo(ExternalLabelName),
749 if (Label->isMSAsmLabel()) {
750 // If we have previously created this label implicitly, mark it as used.
751 Label->markUsed(Context);
753 // Otherwise, insert it, but only resolve it if we have seen the label itself.
754 std::string InternalName;
755 llvm::raw_string_ostream OS(InternalName);
756 // Create an internal name for the label. The name should not be a valid mangled
757 // name, and should be unique. We use a dot to make the name an invalid mangled
759 OS << "__MSASMLABEL_." << MSAsmLabelNameCounter++ << "__";
760 for (auto it = ExternalLabelName.begin(); it != ExternalLabelName.end();
764 // We escape '$' in asm strings by replacing it with "$$"
768 Label->setMSAsmLabel(OS.str());
771 // The label might have been created implicitly from a previously encountered
772 // goto statement. So, for both newly created and looked up labels, we mark
774 Label->setMSAsmLabelResolved();
776 // Adjust their location for being able to generate accurate diagnostics.
777 Label->setLocation(Location);