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/Sema/Scope.h"
16 #include "clang/Sema/ScopeInfo.h"
17 #include "clang/Sema/Initialization.h"
18 #include "clang/Sema/Lookup.h"
19 #include "clang/AST/RecordLayout.h"
20 #include "clang/AST/TypeLoc.h"
21 #include "clang/Lex/Preprocessor.h"
22 #include "clang/Basic/TargetInfo.h"
23 #include "llvm/ADT/ArrayRef.h"
24 #include "llvm/ADT/BitVector.h"
25 #include "llvm/ADT/SmallString.h"
26 #include "llvm/MC/MCAsmInfo.h"
27 #include "llvm/MC/MCContext.h"
28 #include "llvm/MC/MCObjectFileInfo.h"
29 #include "llvm/MC/MCRegisterInfo.h"
30 #include "llvm/MC/MCStreamer.h"
31 #include "llvm/MC/MCSubtargetInfo.h"
32 #include "llvm/MC/MCTargetAsmParser.h"
33 #include "llvm/MC/MCParser/MCAsmParser.h"
34 #include "llvm/Support/SourceMgr.h"
35 #include "llvm/Support/TargetRegistry.h"
36 #include "llvm/Support/TargetSelect.h"
37 using namespace clang;
40 /// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently
41 /// ignore "noop" casts in places where an lvalue is required by an inline asm.
42 /// We emulate this behavior when -fheinous-gnu-extensions is specified, but
43 /// provide a strong guidance to not use it.
45 /// This method checks to see if the argument is an acceptable l-value and
46 /// returns false if it is a case we can handle.
47 static bool CheckAsmLValue(const Expr *E, Sema &S) {
48 // Type dependent expressions will be checked during instantiation.
49 if (E->isTypeDependent())
53 return false; // Cool, this is an lvalue.
55 // Okay, this is not an lvalue, but perhaps it is the result of a cast that we
56 // are supposed to allow.
57 const Expr *E2 = E->IgnoreParenNoopCasts(S.Context);
58 if (E != E2 && E2->isLValue()) {
59 if (!S.getLangOpts().HeinousExtensions)
60 S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue)
61 << E->getSourceRange();
63 S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue)
64 << E->getSourceRange();
65 // Accept, even if we emitted an error diagnostic.
69 // None of the above, just randomly invalid non-lvalue.
73 /// isOperandMentioned - Return true if the specified operand # is mentioned
74 /// anywhere in the decomposed asm string.
75 static bool isOperandMentioned(unsigned OpNo,
76 ArrayRef<GCCAsmStmt::AsmStringPiece> AsmStrPieces) {
77 for (unsigned p = 0, e = AsmStrPieces.size(); p != e; ++p) {
78 const GCCAsmStmt::AsmStringPiece &Piece = AsmStrPieces[p];
79 if (!Piece.isOperand()) continue;
81 // If this is a reference to the input and if the input was the smaller
82 // one, then we have to reject this asm.
83 if (Piece.getOperandNo() == OpNo)
89 StmtResult Sema::ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
90 bool IsVolatile, unsigned NumOutputs,
91 unsigned NumInputs, IdentifierInfo **Names,
92 MultiExprArg constraints, MultiExprArg exprs,
93 Expr *asmString, MultiExprArg clobbers,
94 SourceLocation RParenLoc) {
95 unsigned NumClobbers = clobbers.size();
96 StringLiteral **Constraints =
97 reinterpret_cast<StringLiteral**>(constraints.data());
98 Expr **Exprs = exprs.data();
99 StringLiteral *AsmString = cast<StringLiteral>(asmString);
100 StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.data());
102 SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos;
104 // The parser verifies that there is a string literal here.
105 if (!AsmString->isAscii())
106 return StmtError(Diag(AsmString->getLocStart(),diag::err_asm_wide_character)
107 << AsmString->getSourceRange());
109 for (unsigned i = 0; i != NumOutputs; i++) {
110 StringLiteral *Literal = Constraints[i];
111 if (!Literal->isAscii())
112 return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character)
113 << Literal->getSourceRange());
115 StringRef OutputName;
117 OutputName = Names[i]->getName();
119 TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName);
120 if (!Context.getTargetInfo().validateOutputConstraint(Info))
121 return StmtError(Diag(Literal->getLocStart(),
122 diag::err_asm_invalid_output_constraint)
123 << Info.getConstraintStr());
125 // Check that the output exprs are valid lvalues.
126 Expr *OutputExpr = Exprs[i];
127 if (CheckAsmLValue(OutputExpr, *this)) {
128 return StmtError(Diag(OutputExpr->getLocStart(),
129 diag::err_asm_invalid_lvalue_in_output)
130 << OutputExpr->getSourceRange());
133 OutputConstraintInfos.push_back(Info);
136 SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos;
138 for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) {
139 StringLiteral *Literal = Constraints[i];
140 if (!Literal->isAscii())
141 return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character)
142 << Literal->getSourceRange());
146 InputName = Names[i]->getName();
148 TargetInfo::ConstraintInfo Info(Literal->getString(), InputName);
149 if (!Context.getTargetInfo().validateInputConstraint(OutputConstraintInfos.data(),
151 return StmtError(Diag(Literal->getLocStart(),
152 diag::err_asm_invalid_input_constraint)
153 << Info.getConstraintStr());
156 Expr *InputExpr = Exprs[i];
158 // Only allow void types for memory constraints.
159 if (Info.allowsMemory() && !Info.allowsRegister()) {
160 if (CheckAsmLValue(InputExpr, *this))
161 return StmtError(Diag(InputExpr->getLocStart(),
162 diag::err_asm_invalid_lvalue_in_input)
163 << Info.getConstraintStr()
164 << InputExpr->getSourceRange());
167 if (Info.allowsRegister()) {
168 if (InputExpr->getType()->isVoidType()) {
169 return StmtError(Diag(InputExpr->getLocStart(),
170 diag::err_asm_invalid_type_in_input)
171 << InputExpr->getType() << Info.getConstraintStr()
172 << InputExpr->getSourceRange());
176 ExprResult Result = DefaultFunctionArrayLvalueConversion(Exprs[i]);
177 if (Result.isInvalid())
180 Exprs[i] = Result.take();
181 InputConstraintInfos.push_back(Info);
184 // Check that the clobbers are valid.
185 for (unsigned i = 0; i != NumClobbers; i++) {
186 StringLiteral *Literal = Clobbers[i];
187 if (!Literal->isAscii())
188 return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character)
189 << Literal->getSourceRange());
191 StringRef Clobber = Literal->getString();
193 if (!Context.getTargetInfo().isValidClobber(Clobber))
194 return StmtError(Diag(Literal->getLocStart(),
195 diag::err_asm_unknown_register_name) << Clobber);
199 new (Context) GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
200 NumInputs, Names, Constraints, Exprs, AsmString,
201 NumClobbers, Clobbers, RParenLoc);
202 // Validate the asm string, ensuring it makes sense given the operands we
204 SmallVector<GCCAsmStmt::AsmStringPiece, 8> Pieces;
206 if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) {
207 Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID)
208 << AsmString->getSourceRange();
212 // Validate constraints and modifiers.
213 for (unsigned i = 0, e = Pieces.size(); i != e; ++i) {
214 GCCAsmStmt::AsmStringPiece &Piece = Pieces[i];
215 if (!Piece.isOperand()) continue;
217 // Look for the correct constraint index.
219 unsigned ConstraintIdx = 0;
220 for (unsigned i = 0, e = NS->getNumOutputs(); i != e; ++i, ++ConstraintIdx) {
221 TargetInfo::ConstraintInfo &Info = OutputConstraintInfos[i];
222 if (Idx == Piece.getOperandNo())
226 if (Info.isReadWrite()) {
227 if (Idx == Piece.getOperandNo())
233 for (unsigned i = 0, e = NS->getNumInputs(); i != e; ++i, ++ConstraintIdx) {
234 TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i];
235 if (Idx == Piece.getOperandNo())
239 if (Info.isReadWrite()) {
240 if (Idx == Piece.getOperandNo())
246 // Now that we have the right indexes go ahead and check.
247 StringLiteral *Literal = Constraints[ConstraintIdx];
248 const Type *Ty = Exprs[ConstraintIdx]->getType().getTypePtr();
249 if (Ty->isDependentType() || Ty->isIncompleteType())
252 unsigned Size = Context.getTypeSize(Ty);
253 if (!Context.getTargetInfo()
254 .validateConstraintModifier(Literal->getString(), Piece.getModifier(),
256 Diag(Exprs[ConstraintIdx]->getLocStart(),
257 diag::warn_asm_mismatched_size_modifier);
260 // Validate tied input operands for type mismatches.
261 for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) {
262 TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i];
264 // If this is a tied constraint, verify that the output and input have
265 // either exactly the same type, or that they are int/ptr operands with the
266 // same size (int/long, int*/long, are ok etc).
267 if (!Info.hasTiedOperand()) continue;
269 unsigned TiedTo = Info.getTiedOperand();
270 unsigned InputOpNo = i+NumOutputs;
271 Expr *OutputExpr = Exprs[TiedTo];
272 Expr *InputExpr = Exprs[InputOpNo];
274 if (OutputExpr->isTypeDependent() || InputExpr->isTypeDependent())
277 QualType InTy = InputExpr->getType();
278 QualType OutTy = OutputExpr->getType();
279 if (Context.hasSameType(InTy, OutTy))
280 continue; // All types can be tied to themselves.
282 // Decide if the input and output are in the same domain (integer/ptr or
285 AD_Int, AD_FP, AD_Other
286 } InputDomain, OutputDomain;
288 if (InTy->isIntegerType() || InTy->isPointerType())
289 InputDomain = AD_Int;
290 else if (InTy->isRealFloatingType())
293 InputDomain = AD_Other;
295 if (OutTy->isIntegerType() || OutTy->isPointerType())
296 OutputDomain = AD_Int;
297 else if (OutTy->isRealFloatingType())
298 OutputDomain = AD_FP;
300 OutputDomain = AD_Other;
302 // They are ok if they are the same size and in the same domain. This
303 // allows tying things like:
305 // void* to int if they are the same size.
306 // double to long double if they are the same size.
308 uint64_t OutSize = Context.getTypeSize(OutTy);
309 uint64_t InSize = Context.getTypeSize(InTy);
310 if (OutSize == InSize && InputDomain == OutputDomain &&
311 InputDomain != AD_Other)
314 // If the smaller input/output operand is not mentioned in the asm string,
315 // then we can promote the smaller one to a larger input and the asm string
317 bool SmallerValueMentioned = false;
319 // If this is a reference to the input and if the input was the smaller
320 // one, then we have to reject this asm.
321 if (isOperandMentioned(InputOpNo, Pieces)) {
322 // This is a use in the asm string of the smaller operand. Since we
323 // codegen this by promoting to a wider value, the asm will get printed
325 SmallerValueMentioned |= InSize < OutSize;
327 if (isOperandMentioned(TiedTo, Pieces)) {
328 // If this is a reference to the output, and if the output is the larger
329 // value, then it's ok because we'll promote the input to the larger type.
330 SmallerValueMentioned |= OutSize < InSize;
333 // If the smaller value wasn't mentioned in the asm string, and if the
334 // output was a register, just extend the shorter one to the size of the
336 if (!SmallerValueMentioned && InputDomain != AD_Other &&
337 OutputConstraintInfos[TiedTo].allowsRegister())
340 // Either both of the operands were mentioned or the smaller one was
341 // mentioned. One more special case that we'll allow: if the tied input is
342 // integer, unmentioned, and is a constant, then we'll allow truncating it
343 // down to the size of the destination.
344 if (InputDomain == AD_Int && OutputDomain == AD_Int &&
345 !isOperandMentioned(InputOpNo, Pieces) &&
346 InputExpr->isEvaluatable(Context)) {
348 (OutTy->isBooleanType() ? CK_IntegralToBoolean : CK_IntegralCast);
349 InputExpr = ImpCastExprToType(InputExpr, OutTy, castKind).take();
350 Exprs[InputOpNo] = InputExpr;
351 NS->setInputExpr(i, InputExpr);
355 Diag(InputExpr->getLocStart(),
356 diag::err_asm_tying_incompatible_types)
357 << InTy << OutTy << OutputExpr->getSourceRange()
358 << InputExpr->getSourceRange();
365 // getSpelling - Get the spelling of the AsmTok token.
366 static StringRef getSpelling(Sema &SemaRef, Token AsmTok) {
368 SmallString<512> TokenBuf;
369 TokenBuf.resize(512);
370 bool StringInvalid = false;
371 Asm = SemaRef.PP.getSpelling(AsmTok, TokenBuf, &StringInvalid);
372 assert (!StringInvalid && "Expected valid string!");
376 // Build the inline assembly string. Returns true on error.
377 static bool buildMSAsmString(Sema &SemaRef,
378 SourceLocation AsmLoc,
379 ArrayRef<Token> AsmToks,
380 llvm::SmallVectorImpl<unsigned> &TokOffsets,
381 std::string &AsmString) {
382 assert (!AsmToks.empty() && "Didn't expect an empty AsmToks!");
384 SmallString<512> Asm;
385 for (unsigned i = 0, e = AsmToks.size(); i < e; ++i) {
386 bool isNewAsm = ((i == 0) ||
387 AsmToks[i].isAtStartOfLine() ||
388 AsmToks[i].is(tok::kw_asm));
393 if (AsmToks[i].is(tok::kw_asm)) {
396 SemaRef.Diag(AsmLoc, diag::err_asm_empty);
403 if (i && AsmToks[i].hasLeadingSpace() && !isNewAsm)
406 StringRef Spelling = getSpelling(SemaRef, AsmToks[i]);
408 TokOffsets.push_back(Asm.size());
410 AsmString = Asm.str();
416 class MCAsmParserSemaCallbackImpl : public llvm::MCAsmParserSemaCallback {
418 SourceLocation AsmLoc;
419 ArrayRef<Token> AsmToks;
420 ArrayRef<unsigned> TokOffsets;
423 MCAsmParserSemaCallbackImpl(Sema &Ref, SourceLocation Loc,
424 ArrayRef<Token> Toks,
425 ArrayRef<unsigned> Offsets)
426 : SemaRef(Ref), AsmLoc(Loc), AsmToks(Toks), TokOffsets(Offsets) { }
427 ~MCAsmParserSemaCallbackImpl() {}
429 void *LookupInlineAsmIdentifier(StringRef Name, void *SrcLoc, unsigned &Size){
430 SourceLocation Loc = SourceLocation::getFromPtrEncoding(SrcLoc);
431 NamedDecl *OpDecl = SemaRef.LookupInlineAsmIdentifier(Name, Loc, Size);
432 return static_cast<void *>(OpDecl);
435 bool LookupInlineAsmField(StringRef Base, StringRef Member,
437 return SemaRef.LookupInlineAsmField(Base, Member, Offset, AsmLoc);
440 static void MSAsmDiagHandlerCallback(const llvm::SMDiagnostic &D,
442 ((MCAsmParserSemaCallbackImpl*)Context)->MSAsmDiagHandler(D);
444 void MSAsmDiagHandler(const llvm::SMDiagnostic &D) {
445 // Compute an offset into the inline asm buffer.
446 // FIXME: This isn't right if .macro is involved (but hopefully, no
447 // real-world code does that).
448 const llvm::SourceMgr &LSM = *D.getSourceMgr();
449 const llvm::MemoryBuffer *LBuf =
450 LSM.getMemoryBuffer(LSM.FindBufferContainingLoc(D.getLoc()));
451 unsigned Offset = D.getLoc().getPointer() - LBuf->getBufferStart();
453 // Figure out which token that offset points into.
454 const unsigned *OffsetPtr =
455 std::lower_bound(TokOffsets.begin(), TokOffsets.end(), Offset);
456 unsigned TokIndex = OffsetPtr - TokOffsets.begin();
458 // If we come up with an answer which seems sane, use it; otherwise,
459 // just point at the __asm keyword.
460 // FIXME: Assert the answer is sane once we handle .macro correctly.
461 SourceLocation Loc = AsmLoc;
462 if (TokIndex < AsmToks.size()) {
463 const Token *Tok = &AsmToks[TokIndex];
464 Loc = Tok->getLocation();
465 Loc = Loc.getLocWithOffset(Offset - (*OffsetPtr - Tok->getLength()));
467 SemaRef.Diag(Loc, diag::err_inline_ms_asm_parsing) << D.getMessage();
473 NamedDecl *Sema::LookupInlineAsmIdentifier(StringRef Name, SourceLocation Loc,
476 LookupResult Result(*this, &Context.Idents.get(Name), Loc,
477 Sema::LookupOrdinaryName);
479 if (!LookupName(Result, getCurScope())) {
480 // If we don't find anything, return null; the AsmParser will assume
481 // it is a label of some sort.
485 if (!Result.isSingleResult()) {
486 // FIXME: Diagnose result.
490 NamedDecl *ND = Result.getFoundDecl();
491 if (isa<VarDecl>(ND) || isa<FunctionDecl>(ND)) {
492 if (VarDecl *Var = dyn_cast<VarDecl>(ND))
493 Size = Context.getTypeInfo(Var->getType()).first;
498 // FIXME: Handle other kinds of results? (FieldDecl, etc.)
499 // FIXME: Diagnose if we find something we can't handle, like a typedef.
503 bool Sema::LookupInlineAsmField(StringRef Base, StringRef Member,
504 unsigned &Offset, SourceLocation AsmLoc) {
506 LookupResult BaseResult(*this, &Context.Idents.get(Base), SourceLocation(),
509 if (!LookupName(BaseResult, getCurScope()))
512 if (!BaseResult.isSingleResult())
515 NamedDecl *FoundDecl = BaseResult.getFoundDecl();
516 const RecordType *RT = 0;
517 if (VarDecl *VD = dyn_cast<VarDecl>(FoundDecl)) {
518 RT = VD->getType()->getAs<RecordType>();
519 } else if (TypedefDecl *TD = dyn_cast<TypedefDecl>(FoundDecl)) {
520 RT = TD->getUnderlyingType()->getAs<RecordType>();
525 if (RequireCompleteType(AsmLoc, QualType(RT, 0), 0))
528 LookupResult FieldResult(*this, &Context.Idents.get(Member), SourceLocation(),
531 if (!LookupQualifiedName(FieldResult, RT->getDecl()))
534 // FIXME: Handle IndirectFieldDecl?
535 FieldDecl *FD = dyn_cast<FieldDecl>(FieldResult.getFoundDecl());
539 const ASTRecordLayout &RL = Context.getASTRecordLayout(RT->getDecl());
540 unsigned i = FD->getFieldIndex();
541 CharUnits Result = Context.toCharUnitsFromBits(RL.getFieldOffset(i));
542 Offset = (unsigned)Result.getQuantity();
547 StmtResult Sema::ActOnMSAsmStmt(SourceLocation AsmLoc, SourceLocation LBraceLoc,
548 ArrayRef<Token> AsmToks,SourceLocation EndLoc) {
549 SmallVector<IdentifierInfo*, 4> Names;
550 SmallVector<StringRef, 4> ConstraintRefs;
551 SmallVector<Expr*, 4> Exprs;
552 SmallVector<StringRef, 4> ClobberRefs;
554 // Empty asm statements don't need to instantiate the AsmParser, etc.
555 if (AsmToks.empty()) {
556 StringRef EmptyAsmStr;
558 new (Context) MSAsmStmt(Context, AsmLoc, LBraceLoc, /*IsSimple*/ true,
559 /*IsVolatile*/ true, AsmToks, /*NumOutputs*/ 0,
560 /*NumInputs*/ 0, Names, ConstraintRefs, Exprs,
561 EmptyAsmStr, ClobberRefs, EndLoc);
565 std::string AsmString;
566 llvm::SmallVector<unsigned, 8> TokOffsets;
567 if (buildMSAsmString(*this, AsmLoc, AsmToks, TokOffsets, AsmString))
570 // Get the target specific parser.
572 const std::string &TT = Context.getTargetInfo().getTriple().getTriple();
573 const llvm::Target *TheTarget(llvm::TargetRegistry::lookupTarget(TT, Error));
575 OwningPtr<llvm::MCAsmInfo> MAI(TheTarget->createMCAsmInfo(TT));
576 OwningPtr<llvm::MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TT));
577 OwningPtr<llvm::MCObjectFileInfo> MOFI(new llvm::MCObjectFileInfo());
578 OwningPtr<llvm::MCSubtargetInfo>
579 STI(TheTarget->createMCSubtargetInfo(TT, "", ""));
581 llvm::SourceMgr SrcMgr;
582 llvm::MCContext Ctx(*MAI, *MRI, MOFI.get(), &SrcMgr);
583 llvm::MemoryBuffer *Buffer =
584 llvm::MemoryBuffer::getMemBuffer(AsmString, "<inline asm>");
586 // Tell SrcMgr about this buffer, which is what the parser will pick up.
587 SrcMgr.AddNewSourceBuffer(Buffer, llvm::SMLoc());
589 OwningPtr<llvm::MCStreamer> Str(createNullStreamer(Ctx));
590 OwningPtr<llvm::MCAsmParser>
591 Parser(createMCAsmParser(SrcMgr, Ctx, *Str.get(), *MAI));
592 OwningPtr<llvm::MCTargetAsmParser>
593 TargetParser(TheTarget->createMCAsmParser(*STI, *Parser));
595 // Get the instruction descriptor.
596 const llvm::MCInstrInfo *MII = TheTarget->createMCInstrInfo();
597 llvm::MCInstPrinter *IP =
598 TheTarget->createMCInstPrinter(1, *MAI, *MII, *MRI, *STI);
600 // Change to the Intel dialect.
601 Parser->setAssemblerDialect(1);
602 Parser->setTargetParser(*TargetParser.get());
603 Parser->setParsingInlineAsm(true);
604 TargetParser->setParsingInlineAsm(true);
606 MCAsmParserSemaCallbackImpl MCAPSI(*this, AsmLoc, AsmToks, TokOffsets);
607 TargetParser->setSemaCallback(&MCAPSI);
608 SrcMgr.setDiagHandler(MCAsmParserSemaCallbackImpl::MSAsmDiagHandlerCallback,
613 std::string AsmStringIR;
614 SmallVector<std::pair<void *, bool>, 4> OpDecls;
615 SmallVector<std::string, 4> Constraints;
616 SmallVector<std::string, 4> Clobbers;
617 if (Parser->ParseMSInlineAsm(AsmLoc.getPtrEncoding(), AsmStringIR,
618 NumOutputs, NumInputs, OpDecls, Constraints,
619 Clobbers, MII, IP, MCAPSI))
622 // Build the vector of clobber StringRefs.
623 unsigned NumClobbers = Clobbers.size();
624 ClobberRefs.resize(NumClobbers);
625 for (unsigned i = 0; i != NumClobbers; ++i)
626 ClobberRefs[i] = StringRef(Clobbers[i]);
628 // Recast the void pointers and build the vector of constraint StringRefs.
629 unsigned NumExprs = NumOutputs + NumInputs;
630 Names.resize(NumExprs);
631 ConstraintRefs.resize(NumExprs);
632 Exprs.resize(NumExprs);
633 for (unsigned i = 0, e = NumExprs; i != e; ++i) {
634 NamedDecl *OpDecl = static_cast<NamedDecl *>(OpDecls[i].first);
638 DeclarationNameInfo NameInfo(OpDecl->getDeclName(), AsmLoc);
639 ExprResult OpExpr = BuildDeclarationNameExpr(CXXScopeSpec(), NameInfo,
641 if (OpExpr.isInvalid())
644 // Need offset of variable.
645 if (OpDecls[i].second)
646 OpExpr = BuildUnaryOp(getCurScope(), AsmLoc, clang::UO_AddrOf,
649 Names[i] = OpDecl->getIdentifier();
650 ConstraintRefs[i] = StringRef(Constraints[i]);
651 Exprs[i] = OpExpr.take();
654 bool IsSimple = NumExprs > 0;
656 new (Context) MSAsmStmt(Context, AsmLoc, LBraceLoc, IsSimple,
657 /*IsVolatile*/ true, AsmToks, NumOutputs, NumInputs,
658 Names, ConstraintRefs, Exprs, AsmStringIR,
659 ClobberRefs, EndLoc);