| //===--- SemaStmtAsm.cpp - Semantic Analysis for 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/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/MCInst.h" |
| #include "llvm/MC/MCInstPrinter.h" |
| #include "llvm/MC/MCInstrInfo.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/MCAsmLexer.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<AsmStmt::AsmStringPiece> AsmStrPieces) { |
| for (unsigned p = 0, e = AsmStrPieces.size(); p != e; ++p) { |
| const AsmStmt::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::ActOnAsmStmt(SourceLocation AsmLoc, bool IsSimple, |
| bool IsVolatile, unsigned NumOutputs, |
| unsigned NumInputs, IdentifierInfo **Names, |
| MultiExprArg constraints, MultiExprArg exprs, |
| Expr *asmString, MultiExprArg clobbers, |
| SourceLocation RParenLoc, bool MSAsm) { |
| unsigned NumClobbers = clobbers.size(); |
| StringLiteral **Constraints = |
| reinterpret_cast<StringLiteral**>(constraints.get()); |
| Expr **Exprs = exprs.get(); |
| StringLiteral *AsmString = cast<StringLiteral>(asmString); |
| StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.get()); |
| |
| 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); |
| } |
| |
| AsmStmt *NS = |
| new (Context) AsmStmt(Context, AsmLoc, IsSimple, IsVolatile, MSAsm, |
| NumOutputs, NumInputs, Names, Constraints, Exprs, |
| AsmString, NumClobbers, Clobbers, RParenLoc); |
| // Validate the asm string, ensuring it makes sense given the operands we |
| // have. |
| SmallVector<AsmStmt::AsmStringPiece, 8> Pieces; |
| unsigned DiagOffs; |
| if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) { |
| Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID) |
| << AsmString->getSourceRange(); |
| return StmtError(); |
| } |
| |
| // 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); |
| } |
| |
| // isMSAsmKeyword - Return true if this is an MS-style inline asm keyword. These |
| // require special handling. |
| static bool isMSAsmKeyword(StringRef Name) { |
| bool Ret = llvm::StringSwitch<bool>(Name) |
| .Cases("EVEN", "ALIGN", true) // Alignment directives. |
| .Cases("LENGTH", "SIZE", "TYPE", true) // Type and variable sizes. |
| .Case("_emit", true) // _emit Pseudoinstruction. |
| .Default(false); |
| return Ret; |
| } |
| |
| 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; |
| } |
| |
| static void patchMSAsmStrings(Sema &SemaRef, bool &IsSimple, |
| SourceLocation AsmLoc, |
| ArrayRef<Token> AsmToks, |
| const TargetInfo &TI, |
| std::vector<llvm::BitVector> &AsmRegs, |
| std::vector<llvm::BitVector> &AsmNames, |
| std::vector<std::string> &AsmStrings) { |
| assert (!AsmToks.empty() && "Didn't expect an empty AsmToks!"); |
| |
| // Assume simple asm stmt until we parse a non-register identifer (or we just |
| // need to bail gracefully). |
| IsSimple = true; |
| |
| SmallString<512> Asm; |
| unsigned NumAsmStrings = 0; |
| for (unsigned i = 0, e = AsmToks.size(); i != e; ++i) { |
| |
| // Determine if this should be considered a new asm. |
| bool isNewAsm = i == 0 || AsmToks[i].isAtStartOfLine() || |
| AsmToks[i].is(tok::kw_asm); |
| |
| // Emit the previous asm string. |
| if (i && isNewAsm) { |
| AsmStrings[NumAsmStrings++] = Asm.c_str(); |
| if (AsmToks[i].is(tok::kw_asm)) { |
| ++i; // Skip __asm |
| assert (i != e && "Expected another token."); |
| } |
| } |
| |
| // Start a new asm string with the opcode. |
| if (isNewAsm) { |
| AsmRegs[NumAsmStrings].resize(AsmToks.size()); |
| AsmNames[NumAsmStrings].resize(AsmToks.size()); |
| |
| StringRef Piece = AsmToks[i].getIdentifierInfo()->getName(); |
| // MS-style inline asm keywords require special handling. |
| if (isMSAsmKeyword(Piece)) |
| IsSimple = false; |
| |
| // TODO: Verify this is a valid opcode. |
| Asm = Piece; |
| continue; |
| } |
| |
| if (i && AsmToks[i].hasLeadingSpace()) |
| Asm += ' '; |
| |
| // Check the operand(s). |
| switch (AsmToks[i].getKind()) { |
| default: |
| IsSimple = false; |
| Asm += getSpelling(SemaRef, AsmToks[i]); |
| break; |
| case tok::comma: Asm += ","; break; |
| case tok::colon: Asm += ":"; break; |
| case tok::l_square: Asm += "["; break; |
| case tok::r_square: Asm += "]"; break; |
| case tok::l_brace: Asm += "{"; break; |
| case tok::r_brace: Asm += "}"; break; |
| case tok::numeric_constant: |
| Asm += getSpelling(SemaRef, AsmToks[i]); |
| break; |
| case tok::identifier: { |
| IdentifierInfo *II = AsmToks[i].getIdentifierInfo(); |
| StringRef Name = II->getName(); |
| |
| // Valid register? |
| if (TI.isValidGCCRegisterName(Name)) { |
| AsmRegs[NumAsmStrings].set(i); |
| Asm += Name; |
| break; |
| } |
| |
| IsSimple = false; |
| |
| // MS-style inline asm keywords require special handling. |
| if (isMSAsmKeyword(Name)) { |
| IsSimple = false; |
| Asm += Name; |
| break; |
| } |
| |
| // FIXME: Why are we missing this segment register? |
| if (Name == "fs") { |
| Asm += Name; |
| break; |
| } |
| |
| // Lookup the identifier. |
| // TODO: Someone with more experience with clang should verify this the |
| // proper way of doing a symbol lookup. |
| DeclarationName DeclName(II); |
| Scope *CurScope = SemaRef.getCurScope(); |
| LookupResult R(SemaRef, DeclName, AsmLoc, Sema::LookupOrdinaryName); |
| if (!SemaRef.LookupName(R, CurScope, false/*AllowBuiltinCreation*/)) |
| break; |
| |
| assert (R.isSingleResult() && "Expected a single result?!"); |
| NamedDecl *Decl = R.getFoundDecl(); |
| switch (Decl->getKind()) { |
| default: |
| assert(0 && "Unknown decl kind."); |
| break; |
| case Decl::Var: { |
| case Decl::ParmVar: |
| AsmNames[NumAsmStrings].set(i); |
| |
| VarDecl *Var = cast<VarDecl>(Decl); |
| QualType Ty = Var->getType(); |
| (void)Ty; // Avoid warning. |
| // TODO: Patch identifier with valid operand. One potential idea is to |
| // probe the backend with type information to guess the possible |
| // operand. |
| break; |
| } |
| } |
| break; |
| } |
| } |
| } |
| |
| // Emit the final (and possibly only) asm string. |
| AsmStrings[NumAsmStrings] = Asm.c_str(); |
| } |
| |
| // Build the unmodified MSAsmString. |
| static std::string buildMSAsmString(Sema &SemaRef, |
| ArrayRef<Token> AsmToks, |
| unsigned &NumAsmStrings) { |
| assert (!AsmToks.empty() && "Didn't expect an empty AsmToks!"); |
| NumAsmStrings = 0; |
| |
| 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) { |
| ++NumAsmStrings; |
| if (i) |
| Asm += '\n'; |
| if (AsmToks[i].is(tok::kw_asm)) { |
| i++; // Skip __asm |
| assert (i != e && "Expected another token"); |
| } |
| } |
| |
| if (i && AsmToks[i].hasLeadingSpace() && !isNewAsm) |
| Asm += ' '; |
| |
| Asm += getSpelling(SemaRef, AsmToks[i]); |
| } |
| return Asm.c_str(); |
| } |
| |
| StmtResult Sema::ActOnMSAsmStmt(SourceLocation AsmLoc, |
| SourceLocation LBraceLoc, |
| ArrayRef<Token> AsmToks, |
| SourceLocation EndLoc) { |
| // MS-style inline assembly is not fully supported, so emit a warning. |
| Diag(AsmLoc, diag::warn_unsupported_msasm); |
| SmallVector<StringRef,4> Clobbers; |
| std::set<std::string> ClobberRegs; |
| SmallVector<IdentifierInfo*, 4> Inputs; |
| SmallVector<IdentifierInfo*, 4> Outputs; |
| |
| // Empty asm statements don't need to instantiate the AsmParser, etc. |
| if (AsmToks.empty()) { |
| StringRef AsmString; |
| MSAsmStmt *NS = |
| new (Context) MSAsmStmt(Context, AsmLoc, LBraceLoc, /*IsSimple*/ true, |
| /*IsVolatile*/ true, AsmToks, Inputs, Outputs, |
| AsmString, Clobbers, EndLoc); |
| return Owned(NS); |
| } |
| |
| unsigned NumAsmStrings; |
| std::string AsmString = buildMSAsmString(*this, AsmToks, NumAsmStrings); |
| |
| bool IsSimple; |
| std::vector<llvm::BitVector> Regs; |
| std::vector<llvm::BitVector> Names; |
| std::vector<std::string> PatchedAsmStrings; |
| |
| Regs.resize(NumAsmStrings); |
| Names.resize(NumAsmStrings); |
| PatchedAsmStrings.resize(NumAsmStrings); |
| |
| // Rewrite operands to appease the AsmParser. |
| patchMSAsmStrings(*this, IsSimple, AsmLoc, AsmToks, |
| Context.getTargetInfo(), Regs, Names, PatchedAsmStrings); |
| |
| // patchMSAsmStrings doesn't correctly patch non-simple asm statements. |
| if (!IsSimple) { |
| MSAsmStmt *NS = |
| new (Context) MSAsmStmt(Context, AsmLoc, LBraceLoc, /*IsSimple*/ true, |
| /*IsVolatile*/ true, AsmToks, Inputs, Outputs, |
| AsmString, Clobbers, EndLoc); |
| return Owned(NS); |
| } |
| |
| // Initialize targets and assembly printers/parsers. |
| llvm::InitializeAllTargetInfos(); |
| llvm::InitializeAllTargetMCs(); |
| llvm::InitializeAllAsmParsers(); |
| |
| // 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, "", "")); |
| |
| for (unsigned i = 0, e = PatchedAsmStrings.size(); i != e; ++i) { |
| llvm::SourceMgr SrcMgr; |
| llvm::MCContext Ctx(*MAI, *MRI, MOFI.get(), &SrcMgr); |
| llvm::MemoryBuffer *Buffer = |
| llvm::MemoryBuffer::getMemBuffer(PatchedAsmStrings[i], "<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)); |
| // Change to the Intel dialect. |
| Parser->setAssemblerDialect(1); |
| Parser->setTargetParser(*TargetParser.get()); |
| |
| // Prime the lexer. |
| Parser->Lex(); |
| |
| // Parse the opcode. |
| StringRef IDVal; |
| Parser->ParseIdentifier(IDVal); |
| |
| // Canonicalize the opcode to lower case. |
| SmallString<128> Opcode; |
| for (unsigned i = 0, e = IDVal.size(); i != e; ++i) |
| Opcode.push_back(tolower(IDVal[i])); |
| |
| // Parse the operands. |
| llvm::SMLoc IDLoc; |
| SmallVector<llvm::MCParsedAsmOperand*, 8> Operands; |
| bool HadError = TargetParser->ParseInstruction(Opcode.str(), IDLoc, |
| Operands); |
| assert (!HadError && "Unexpected error parsing instruction"); |
| |
| // Match the MCInstr. |
| SmallVector<llvm::MCInst, 2> Instrs; |
| HadError = TargetParser->MatchInstruction(IDLoc, Operands, Instrs); |
| assert (!HadError && "Unexpected error matching instruction"); |
| assert ((Instrs.size() == 1) && "Expected only a single instruction."); |
| |
| // Get the instruction descriptor. |
| llvm::MCInst Inst = Instrs[0]; |
| const llvm::MCInstrInfo *MII = TheTarget->createMCInstrInfo(); |
| const llvm::MCInstrDesc &Desc = MII->get(Inst.getOpcode()); |
| llvm::MCInstPrinter *IP = |
| TheTarget->createMCInstPrinter(1, *MAI, *MII, *MRI, *STI); |
| |
| // Build the list of clobbers. |
| for (unsigned i = 0, e = Desc.getNumDefs(); i != e; ++i) { |
| const llvm::MCOperand &Op = Inst.getOperand(i); |
| if (!Op.isReg()) |
| continue; |
| |
| std::string Reg; |
| llvm::raw_string_ostream OS(Reg); |
| IP->printRegName(OS, Op.getReg()); |
| |
| StringRef Clobber(OS.str()); |
| if (!Context.getTargetInfo().isValidClobber(Clobber)) |
| return StmtError(Diag(AsmLoc, diag::err_asm_unknown_register_name) << |
| Clobber); |
| ClobberRegs.insert(Reg); |
| } |
| } |
| for (std::set<std::string>::iterator I = ClobberRegs.begin(), |
| E = ClobberRegs.end(); I != E; ++I) |
| Clobbers.push_back(*I); |
| |
| MSAsmStmt *NS = |
| new (Context) MSAsmStmt(Context, AsmLoc, LBraceLoc, IsSimple, |
| /*IsVolatile*/ true, AsmToks, Inputs, Outputs, |
| AsmString, Clobbers, EndLoc); |
| return Owned(NS); |
| } |
