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Diffstat (limited to 'contrib/llvm/tools/clang/lib/Sema/SemaStmtAsm.cpp')
| -rw-r--r-- | contrib/llvm/tools/clang/lib/Sema/SemaStmtAsm.cpp | 661 |
1 files changed, 661 insertions, 0 deletions
diff --git a/contrib/llvm/tools/clang/lib/Sema/SemaStmtAsm.cpp b/contrib/llvm/tools/clang/lib/Sema/SemaStmtAsm.cpp new file mode 100644 index 000000000000..7c2c766e4615 --- /dev/null +++ b/contrib/llvm/tools/clang/lib/Sema/SemaStmtAsm.cpp @@ -0,0 +1,661 @@ +//===--- SemaStmtAsm.cpp - Semantic Analysis for Asm Statements -----------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements semantic analysis for inline asm statements. +// +//===----------------------------------------------------------------------===// + +#include "clang/Sema/SemaInternal.h" +#include "clang/Sema/Scope.h" +#include "clang/Sema/ScopeInfo.h" +#include "clang/Sema/Initialization.h" +#include "clang/Sema/Lookup.h" +#include "clang/AST/RecordLayout.h" +#include "clang/AST/TypeLoc.h" +#include "clang/Lex/Preprocessor.h" +#include "clang/Basic/TargetInfo.h" +#include "llvm/ADT/ArrayRef.h" +#include "llvm/ADT/BitVector.h" +#include "llvm/ADT/SmallString.h" +#include "llvm/MC/MCAsmInfo.h" +#include "llvm/MC/MCContext.h" +#include "llvm/MC/MCObjectFileInfo.h" +#include "llvm/MC/MCRegisterInfo.h" +#include "llvm/MC/MCStreamer.h" +#include "llvm/MC/MCSubtargetInfo.h" +#include "llvm/MC/MCTargetAsmParser.h" +#include "llvm/MC/MCParser/MCAsmParser.h" +#include "llvm/Support/SourceMgr.h" +#include "llvm/Support/TargetRegistry.h" +#include "llvm/Support/TargetSelect.h" +using namespace clang; +using namespace sema; + +/// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently +/// ignore "noop" casts in places where an lvalue is required by an inline asm. +/// We emulate this behavior when -fheinous-gnu-extensions is specified, but +/// provide a strong guidance to not use it. +/// +/// This method checks to see if the argument is an acceptable l-value and +/// returns false if it is a case we can handle. +static bool CheckAsmLValue(const Expr *E, Sema &S) { + // Type dependent expressions will be checked during instantiation. + if (E->isTypeDependent()) + return false; + + if (E->isLValue()) + return false; // Cool, this is an lvalue. + + // Okay, this is not an lvalue, but perhaps it is the result of a cast that we + // are supposed to allow. + const Expr *E2 = E->IgnoreParenNoopCasts(S.Context); + if (E != E2 && E2->isLValue()) { + if (!S.getLangOpts().HeinousExtensions) + S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue) + << E->getSourceRange(); + else + S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue) + << E->getSourceRange(); + // Accept, even if we emitted an error diagnostic. + return false; + } + + // None of the above, just randomly invalid non-lvalue. + return true; +} + +/// isOperandMentioned - Return true if the specified operand # is mentioned +/// anywhere in the decomposed asm string. +static bool isOperandMentioned(unsigned OpNo, + ArrayRef<GCCAsmStmt::AsmStringPiece> AsmStrPieces) { + for (unsigned p = 0, e = AsmStrPieces.size(); p != e; ++p) { + const GCCAsmStmt::AsmStringPiece &Piece = AsmStrPieces[p]; + if (!Piece.isOperand()) continue; + + // If this is a reference to the input and if the input was the smaller + // one, then we have to reject this asm. + if (Piece.getOperandNo() == OpNo) + return true; + } + return false; +} + +StmtResult Sema::ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple, + bool IsVolatile, unsigned NumOutputs, + unsigned NumInputs, IdentifierInfo **Names, + MultiExprArg constraints, MultiExprArg exprs, + Expr *asmString, MultiExprArg clobbers, + SourceLocation RParenLoc) { + unsigned NumClobbers = clobbers.size(); + StringLiteral **Constraints = + reinterpret_cast<StringLiteral**>(constraints.data()); + Expr **Exprs = exprs.data(); + StringLiteral *AsmString = cast<StringLiteral>(asmString); + StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.data()); + + SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos; + + // The parser verifies that there is a string literal here. + if (!AsmString->isAscii()) + return StmtError(Diag(AsmString->getLocStart(),diag::err_asm_wide_character) + << AsmString->getSourceRange()); + + for (unsigned i = 0; i != NumOutputs; i++) { + StringLiteral *Literal = Constraints[i]; + if (!Literal->isAscii()) + return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) + << Literal->getSourceRange()); + + StringRef OutputName; + if (Names[i]) + OutputName = Names[i]->getName(); + + TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName); + if (!Context.getTargetInfo().validateOutputConstraint(Info)) + return StmtError(Diag(Literal->getLocStart(), + diag::err_asm_invalid_output_constraint) + << Info.getConstraintStr()); + + // Check that the output exprs are valid lvalues. + Expr *OutputExpr = Exprs[i]; + if (CheckAsmLValue(OutputExpr, *this)) { + return StmtError(Diag(OutputExpr->getLocStart(), + diag::err_asm_invalid_lvalue_in_output) + << OutputExpr->getSourceRange()); + } + + OutputConstraintInfos.push_back(Info); + } + + SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos; + + for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) { + StringLiteral *Literal = Constraints[i]; + if (!Literal->isAscii()) + return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) + << Literal->getSourceRange()); + + StringRef InputName; + if (Names[i]) + InputName = Names[i]->getName(); + + TargetInfo::ConstraintInfo Info(Literal->getString(), InputName); + if (!Context.getTargetInfo().validateInputConstraint(OutputConstraintInfos.data(), + NumOutputs, Info)) { + return StmtError(Diag(Literal->getLocStart(), + diag::err_asm_invalid_input_constraint) + << Info.getConstraintStr()); + } + + Expr *InputExpr = Exprs[i]; + + // Only allow void types for memory constraints. + if (Info.allowsMemory() && !Info.allowsRegister()) { + if (CheckAsmLValue(InputExpr, *this)) + return StmtError(Diag(InputExpr->getLocStart(), + diag::err_asm_invalid_lvalue_in_input) + << Info.getConstraintStr() + << InputExpr->getSourceRange()); + } + + if (Info.allowsRegister()) { + if (InputExpr->getType()->isVoidType()) { + return StmtError(Diag(InputExpr->getLocStart(), + diag::err_asm_invalid_type_in_input) + << InputExpr->getType() << Info.getConstraintStr() + << InputExpr->getSourceRange()); + } + } + + ExprResult Result = DefaultFunctionArrayLvalueConversion(Exprs[i]); + if (Result.isInvalid()) + return StmtError(); + + Exprs[i] = Result.take(); + InputConstraintInfos.push_back(Info); + } + + // Check that the clobbers are valid. + for (unsigned i = 0; i != NumClobbers; i++) { + StringLiteral *Literal = Clobbers[i]; + if (!Literal->isAscii()) + return StmtError(Diag(Literal->getLocStart(),diag::err_asm_wide_character) + << Literal->getSourceRange()); + + StringRef Clobber = Literal->getString(); + + if (!Context.getTargetInfo().isValidClobber(Clobber)) + return StmtError(Diag(Literal->getLocStart(), + diag::err_asm_unknown_register_name) << Clobber); + } + + GCCAsmStmt *NS = + new (Context) GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs, + NumInputs, Names, Constraints, Exprs, AsmString, + NumClobbers, Clobbers, RParenLoc); + // Validate the asm string, ensuring it makes sense given the operands we + // have. + SmallVector<GCCAsmStmt::AsmStringPiece, 8> Pieces; + unsigned DiagOffs; + if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) { + Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID) + << AsmString->getSourceRange(); + return StmtError(); + } + + // Validate constraints and modifiers. + for (unsigned i = 0, e = Pieces.size(); i != e; ++i) { + GCCAsmStmt::AsmStringPiece &Piece = Pieces[i]; + if (!Piece.isOperand()) continue; + + // Look for the correct constraint index. + unsigned Idx = 0; + unsigned ConstraintIdx = 0; + for (unsigned i = 0, e = NS->getNumOutputs(); i != e; ++i, ++ConstraintIdx) { + TargetInfo::ConstraintInfo &Info = OutputConstraintInfos[i]; + if (Idx == Piece.getOperandNo()) + break; + ++Idx; + + if (Info.isReadWrite()) { + if (Idx == Piece.getOperandNo()) + break; + ++Idx; + } + } + + for (unsigned i = 0, e = NS->getNumInputs(); i != e; ++i, ++ConstraintIdx) { + TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; + if (Idx == Piece.getOperandNo()) + break; + ++Idx; + + if (Info.isReadWrite()) { + if (Idx == Piece.getOperandNo()) + break; + ++Idx; + } + } + + // Now that we have the right indexes go ahead and check. + StringLiteral *Literal = Constraints[ConstraintIdx]; + const Type *Ty = Exprs[ConstraintIdx]->getType().getTypePtr(); + if (Ty->isDependentType() || Ty->isIncompleteType()) + continue; + + unsigned Size = Context.getTypeSize(Ty); + if (!Context.getTargetInfo() + .validateConstraintModifier(Literal->getString(), Piece.getModifier(), + Size)) + Diag(Exprs[ConstraintIdx]->getLocStart(), + diag::warn_asm_mismatched_size_modifier); + } + + // Validate tied input operands for type mismatches. + for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) { + TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i]; + + // If this is a tied constraint, verify that the output and input have + // either exactly the same type, or that they are int/ptr operands with the + // same size (int/long, int*/long, are ok etc). + if (!Info.hasTiedOperand()) continue; + + unsigned TiedTo = Info.getTiedOperand(); + unsigned InputOpNo = i+NumOutputs; + Expr *OutputExpr = Exprs[TiedTo]; + Expr *InputExpr = Exprs[InputOpNo]; + + if (OutputExpr->isTypeDependent() || InputExpr->isTypeDependent()) + continue; + + QualType InTy = InputExpr->getType(); + QualType OutTy = OutputExpr->getType(); + if (Context.hasSameType(InTy, OutTy)) + continue; // All types can be tied to themselves. + + // Decide if the input and output are in the same domain (integer/ptr or + // floating point. + enum AsmDomain { + AD_Int, AD_FP, AD_Other + } InputDomain, OutputDomain; + + if (InTy->isIntegerType() || InTy->isPointerType()) + InputDomain = AD_Int; + else if (InTy->isRealFloatingType()) + InputDomain = AD_FP; + else + InputDomain = AD_Other; + + if (OutTy->isIntegerType() || OutTy->isPointerType()) + OutputDomain = AD_Int; + else if (OutTy->isRealFloatingType()) + OutputDomain = AD_FP; + else + OutputDomain = AD_Other; + + // They are ok if they are the same size and in the same domain. This + // allows tying things like: + // void* to int* + // void* to int if they are the same size. + // double to long double if they are the same size. + // + uint64_t OutSize = Context.getTypeSize(OutTy); + uint64_t InSize = Context.getTypeSize(InTy); + if (OutSize == InSize && InputDomain == OutputDomain && + InputDomain != AD_Other) + continue; + + // If the smaller input/output operand is not mentioned in the asm string, + // then we can promote the smaller one to a larger input and the asm string + // won't notice. + bool SmallerValueMentioned = false; + + // If this is a reference to the input and if the input was the smaller + // one, then we have to reject this asm. + if (isOperandMentioned(InputOpNo, Pieces)) { + // This is a use in the asm string of the smaller operand. Since we + // codegen this by promoting to a wider value, the asm will get printed + // "wrong". + SmallerValueMentioned |= InSize < OutSize; + } + if (isOperandMentioned(TiedTo, Pieces)) { + // If this is a reference to the output, and if the output is the larger + // value, then it's ok because we'll promote the input to the larger type. + SmallerValueMentioned |= OutSize < InSize; + } + + // If the smaller value wasn't mentioned in the asm string, and if the + // output was a register, just extend the shorter one to the size of the + // larger one. + if (!SmallerValueMentioned && InputDomain != AD_Other && + OutputConstraintInfos[TiedTo].allowsRegister()) + continue; + + // Either both of the operands were mentioned or the smaller one was + // mentioned. One more special case that we'll allow: if the tied input is + // integer, unmentioned, and is a constant, then we'll allow truncating it + // down to the size of the destination. + if (InputDomain == AD_Int && OutputDomain == AD_Int && + !isOperandMentioned(InputOpNo, Pieces) && + InputExpr->isEvaluatable(Context)) { + CastKind castKind = + (OutTy->isBooleanType() ? CK_IntegralToBoolean : CK_IntegralCast); + InputExpr = ImpCastExprToType(InputExpr, OutTy, castKind).take(); + Exprs[InputOpNo] = InputExpr; + NS->setInputExpr(i, InputExpr); + continue; + } + + Diag(InputExpr->getLocStart(), + diag::err_asm_tying_incompatible_types) + << InTy << OutTy << OutputExpr->getSourceRange() + << InputExpr->getSourceRange(); + return StmtError(); + } + + return Owned(NS); +} + +// getSpelling - Get the spelling of the AsmTok token. +static StringRef getSpelling(Sema &SemaRef, Token AsmTok) { + StringRef Asm; + SmallString<512> TokenBuf; + TokenBuf.resize(512); + bool StringInvalid = false; + Asm = SemaRef.PP.getSpelling(AsmTok, TokenBuf, &StringInvalid); + assert (!StringInvalid && "Expected valid string!"); + return Asm; +} + +// Build the inline assembly string. Returns true on error. +static bool buildMSAsmString(Sema &SemaRef, + SourceLocation AsmLoc, + ArrayRef<Token> AsmToks, + llvm::SmallVectorImpl<unsigned> &TokOffsets, + std::string &AsmString) { + assert (!AsmToks.empty() && "Didn't expect an empty AsmToks!"); + + SmallString<512> Asm; + for (unsigned i = 0, e = AsmToks.size(); i < e; ++i) { + bool isNewAsm = ((i == 0) || + AsmToks[i].isAtStartOfLine() || + AsmToks[i].is(tok::kw_asm)); + if (isNewAsm) { + if (i != 0) + Asm += "\n\t"; + + if (AsmToks[i].is(tok::kw_asm)) { + i++; // Skip __asm + if (i == e) { + SemaRef.Diag(AsmLoc, diag::err_asm_empty); + return true; + } + + } + } + + if (i && AsmToks[i].hasLeadingSpace() && !isNewAsm) + Asm += ' '; + + StringRef Spelling = getSpelling(SemaRef, AsmToks[i]); + Asm += Spelling; + TokOffsets.push_back(Asm.size()); + } + AsmString = Asm.str(); + return false; +} + +namespace { + +class MCAsmParserSemaCallbackImpl : public llvm::MCAsmParserSemaCallback { + Sema &SemaRef; + SourceLocation AsmLoc; + ArrayRef<Token> AsmToks; + ArrayRef<unsigned> TokOffsets; + +public: + MCAsmParserSemaCallbackImpl(Sema &Ref, SourceLocation Loc, + ArrayRef<Token> Toks, + ArrayRef<unsigned> Offsets) + : SemaRef(Ref), AsmLoc(Loc), AsmToks(Toks), TokOffsets(Offsets) { } + ~MCAsmParserSemaCallbackImpl() {} + + void *LookupInlineAsmIdentifier(StringRef Name, void *SrcLoc, unsigned &Size){ + SourceLocation Loc = SourceLocation::getFromPtrEncoding(SrcLoc); + NamedDecl *OpDecl = SemaRef.LookupInlineAsmIdentifier(Name, Loc, Size); + return static_cast<void *>(OpDecl); + } + + bool LookupInlineAsmField(StringRef Base, StringRef Member, + unsigned &Offset) { + return SemaRef.LookupInlineAsmField(Base, Member, Offset, AsmLoc); + } + + static void MSAsmDiagHandlerCallback(const llvm::SMDiagnostic &D, + void *Context) { + ((MCAsmParserSemaCallbackImpl*)Context)->MSAsmDiagHandler(D); + } + void MSAsmDiagHandler(const llvm::SMDiagnostic &D) { + // Compute an offset into the inline asm buffer. + // FIXME: This isn't right if .macro is involved (but hopefully, no + // real-world code does that). + const llvm::SourceMgr &LSM = *D.getSourceMgr(); + const llvm::MemoryBuffer *LBuf = + LSM.getMemoryBuffer(LSM.FindBufferContainingLoc(D.getLoc())); + unsigned Offset = D.getLoc().getPointer() - LBuf->getBufferStart(); + + // Figure out which token that offset points into. + const unsigned *OffsetPtr = + std::lower_bound(TokOffsets.begin(), TokOffsets.end(), Offset); + unsigned TokIndex = OffsetPtr - TokOffsets.begin(); + + // If we come up with an answer which seems sane, use it; otherwise, + // just point at the __asm keyword. + // FIXME: Assert the answer is sane once we handle .macro correctly. + SourceLocation Loc = AsmLoc; + if (TokIndex < AsmToks.size()) { + const Token *Tok = &AsmToks[TokIndex]; + Loc = Tok->getLocation(); + Loc = Loc.getLocWithOffset(Offset - (*OffsetPtr - Tok->getLength())); + } + SemaRef.Diag(Loc, diag::err_inline_ms_asm_parsing) << D.getMessage(); + } +}; + +} + +NamedDecl *Sema::LookupInlineAsmIdentifier(StringRef Name, SourceLocation Loc, + unsigned &Size) { + Size = 0; + LookupResult Result(*this, &Context.Idents.get(Name), Loc, + Sema::LookupOrdinaryName); + + if (!LookupName(Result, getCurScope())) { + // If we don't find anything, return null; the AsmParser will assume + // it is a label of some sort. + return 0; + } + + if (!Result.isSingleResult()) { + // FIXME: Diagnose result. + return 0; + } + + NamedDecl *ND = Result.getFoundDecl(); + if (isa<VarDecl>(ND) || isa<FunctionDecl>(ND)) { + if (VarDecl *Var = dyn_cast<VarDecl>(ND)) + Size = Context.getTypeInfo(Var->getType()).first; + + return ND; + } + + // FIXME: Handle other kinds of results? (FieldDecl, etc.) + // FIXME: Diagnose if we find something we can't handle, like a typedef. + return 0; +} + +bool Sema::LookupInlineAsmField(StringRef Base, StringRef Member, + unsigned &Offset, SourceLocation AsmLoc) { + Offset = 0; + LookupResult BaseResult(*this, &Context.Idents.get(Base), SourceLocation(), + LookupOrdinaryName); + + if (!LookupName(BaseResult, getCurScope())) + return true; + + if (!BaseResult.isSingleResult()) + return true; + + NamedDecl *FoundDecl = BaseResult.getFoundDecl(); + const RecordType *RT = 0; + if (VarDecl *VD = dyn_cast<VarDecl>(FoundDecl)) { + RT = VD->getType()->getAs<RecordType>(); + } else if (TypedefDecl *TD = dyn_cast<TypedefDecl>(FoundDecl)) { + RT = TD->getUnderlyingType()->getAs<RecordType>(); + } + if (!RT) + return true; + + if (RequireCompleteType(AsmLoc, QualType(RT, 0), 0)) + return true; + + LookupResult FieldResult(*this, &Context.Idents.get(Member), SourceLocation(), + LookupMemberName); + + if (!LookupQualifiedName(FieldResult, RT->getDecl())) + return true; + + // FIXME: Handle IndirectFieldDecl? + FieldDecl *FD = dyn_cast<FieldDecl>(FieldResult.getFoundDecl()); + if (!FD) + return true; + + const ASTRecordLayout &RL = Context.getASTRecordLayout(RT->getDecl()); + unsigned i = FD->getFieldIndex(); + CharUnits Result = Context.toCharUnitsFromBits(RL.getFieldOffset(i)); + Offset = (unsigned)Result.getQuantity(); + + return false; +} + +StmtResult Sema::ActOnMSAsmStmt(SourceLocation AsmLoc, SourceLocation LBraceLoc, + ArrayRef<Token> AsmToks,SourceLocation EndLoc) { + SmallVector<IdentifierInfo*, 4> Names; + SmallVector<StringRef, 4> ConstraintRefs; + SmallVector<Expr*, 4> Exprs; + SmallVector<StringRef, 4> ClobberRefs; + + // Empty asm statements don't need to instantiate the AsmParser, etc. + if (AsmToks.empty()) { + StringRef EmptyAsmStr; + MSAsmStmt *NS = + new (Context) MSAsmStmt(Context, AsmLoc, LBraceLoc, /*IsSimple*/ true, + /*IsVolatile*/ true, AsmToks, /*NumOutputs*/ 0, + /*NumInputs*/ 0, Names, ConstraintRefs, Exprs, + EmptyAsmStr, ClobberRefs, EndLoc); + return Owned(NS); + } + + std::string AsmString; + llvm::SmallVector<unsigned, 8> TokOffsets; + if (buildMSAsmString(*this, AsmLoc, AsmToks, TokOffsets, AsmString)) + return StmtError(); + + // Get the target specific parser. + std::string Error; + const std::string &TT = Context.getTargetInfo().getTriple().getTriple(); + const llvm::Target *TheTarget(llvm::TargetRegistry::lookupTarget(TT, Error)); + + OwningPtr<llvm::MCAsmInfo> MAI(TheTarget->createMCAsmInfo(TT)); + OwningPtr<llvm::MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TT)); + OwningPtr<llvm::MCObjectFileInfo> MOFI(new llvm::MCObjectFileInfo()); + OwningPtr<llvm::MCSubtargetInfo> + STI(TheTarget->createMCSubtargetInfo(TT, "", "")); + + llvm::SourceMgr SrcMgr; + llvm::MCContext Ctx(*MAI, *MRI, MOFI.get(), &SrcMgr); + llvm::MemoryBuffer *Buffer = + llvm::MemoryBuffer::getMemBuffer(AsmString, "<inline asm>"); + + // Tell SrcMgr about this buffer, which is what the parser will pick up. + SrcMgr.AddNewSourceBuffer(Buffer, llvm::SMLoc()); + + OwningPtr<llvm::MCStreamer> Str(createNullStreamer(Ctx)); + OwningPtr<llvm::MCAsmParser> + Parser(createMCAsmParser(SrcMgr, Ctx, *Str.get(), *MAI)); + OwningPtr<llvm::MCTargetAsmParser> + TargetParser(TheTarget->createMCAsmParser(*STI, *Parser)); + + // Get the instruction descriptor. + const llvm::MCInstrInfo *MII = TheTarget->createMCInstrInfo(); + llvm::MCInstPrinter *IP = + TheTarget->createMCInstPrinter(1, *MAI, *MII, *MRI, *STI); + + // Change to the Intel dialect. + Parser->setAssemblerDialect(1); + Parser->setTargetParser(*TargetParser.get()); + Parser->setParsingInlineAsm(true); + TargetParser->setParsingInlineAsm(true); + + MCAsmParserSemaCallbackImpl MCAPSI(*this, AsmLoc, AsmToks, TokOffsets); + TargetParser->setSemaCallback(&MCAPSI); + SrcMgr.setDiagHandler(MCAsmParserSemaCallbackImpl::MSAsmDiagHandlerCallback, + &MCAPSI); + + unsigned NumOutputs; + unsigned NumInputs; + std::string AsmStringIR; + SmallVector<std::pair<void *, bool>, 4> OpDecls; + SmallVector<std::string, 4> Constraints; + SmallVector<std::string, 4> Clobbers; + if (Parser->ParseMSInlineAsm(AsmLoc.getPtrEncoding(), AsmStringIR, + NumOutputs, NumInputs, OpDecls, Constraints, + Clobbers, MII, IP, MCAPSI)) + return StmtError(); + + // Build the vector of clobber StringRefs. + unsigned NumClobbers = Clobbers.size(); + ClobberRefs.resize(NumClobbers); + for (unsigned i = 0; i != NumClobbers; ++i) + ClobberRefs[i] = StringRef(Clobbers[i]); + + // Recast the void pointers and build the vector of constraint StringRefs. + unsigned NumExprs = NumOutputs + NumInputs; + Names.resize(NumExprs); + ConstraintRefs.resize(NumExprs); + Exprs.resize(NumExprs); + for (unsigned i = 0, e = NumExprs; i != e; ++i) { + NamedDecl *OpDecl = static_cast<NamedDecl *>(OpDecls[i].first); + if (!OpDecl) + return StmtError(); + + DeclarationNameInfo NameInfo(OpDecl->getDeclName(), AsmLoc); + ExprResult OpExpr = BuildDeclarationNameExpr(CXXScopeSpec(), NameInfo, + OpDecl); + if (OpExpr.isInvalid()) + return StmtError(); + + // Need offset of variable. + if (OpDecls[i].second) + OpExpr = BuildUnaryOp(getCurScope(), AsmLoc, clang::UO_AddrOf, + OpExpr.take()); + + Names[i] = OpDecl->getIdentifier(); + ConstraintRefs[i] = StringRef(Constraints[i]); + Exprs[i] = OpExpr.take(); + } + + bool IsSimple = NumExprs > 0; + MSAsmStmt *NS = + new (Context) MSAsmStmt(Context, AsmLoc, LBraceLoc, IsSimple, + /*IsVolatile*/ true, AsmToks, NumOutputs, NumInputs, + Names, ConstraintRefs, Exprs, AsmStringIR, + ClobberRefs, EndLoc); + return Owned(NS); +} |