summaryrefslogtreecommitdiffstats
path: root/lib/Sema/SemaStmtAsm.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'lib/Sema/SemaStmtAsm.cpp')
-rw-r--r--lib/Sema/SemaStmtAsm.cpp661
1 files changed, 661 insertions, 0 deletions
diff --git a/lib/Sema/SemaStmtAsm.cpp b/lib/Sema/SemaStmtAsm.cpp
new file mode 100644
index 0000000..7c2c766
--- /dev/null
+++ b/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);
+}
OpenPOWER on IntegriCloud