| //===---- ParseStmtAsm.cpp - Assembly Statement Parser --------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements parsing for GCC and Microsoft inline assembly. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/AST/ASTContext.h" |
| #include "clang/Basic/Diagnostic.h" |
| #include "clang/Basic/TargetInfo.h" |
| #include "clang/Parse/Parser.h" |
| #include "clang/Parse/RAIIObjectsForParser.h" |
| #include "llvm/ADT/SmallString.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/MC/MCAsmInfo.h" |
| #include "llvm/MC/MCContext.h" |
| #include "llvm/MC/MCInstPrinter.h" |
| #include "llvm/MC/MCInstrInfo.h" |
| #include "llvm/MC/MCObjectFileInfo.h" |
| #include "llvm/MC/MCParser/MCAsmParser.h" |
| #include "llvm/MC/MCParser/MCTargetAsmParser.h" |
| #include "llvm/MC/MCRegisterInfo.h" |
| #include "llvm/MC/MCStreamer.h" |
| #include "llvm/MC/MCSubtargetInfo.h" |
| #include "llvm/MC/MCTargetOptions.h" |
| #include "llvm/MC/TargetRegistry.h" |
| #include "llvm/Support/SourceMgr.h" |
| #include "llvm/Support/TargetSelect.h" |
| using namespace clang; |
| |
| namespace { |
| class ClangAsmParserCallback : public llvm::MCAsmParserSemaCallback { |
| Parser &TheParser; |
| SourceLocation AsmLoc; |
| StringRef AsmString; |
| |
| /// The tokens we streamed into AsmString and handed off to MC. |
| ArrayRef<Token> AsmToks; |
| |
| /// The offset of each token in AsmToks within AsmString. |
| ArrayRef<unsigned> AsmTokOffsets; |
| |
| public: |
| ClangAsmParserCallback(Parser &P, SourceLocation Loc, StringRef AsmString, |
| ArrayRef<Token> Toks, ArrayRef<unsigned> Offsets) |
| : TheParser(P), AsmLoc(Loc), AsmString(AsmString), AsmToks(Toks), |
| AsmTokOffsets(Offsets) { |
| assert(AsmToks.size() == AsmTokOffsets.size()); |
| } |
| |
| void LookupInlineAsmIdentifier(StringRef &LineBuf, |
| llvm::InlineAsmIdentifierInfo &Info, |
| bool IsUnevaluatedContext) override; |
| |
| StringRef LookupInlineAsmLabel(StringRef Identifier, llvm::SourceMgr &LSM, |
| llvm::SMLoc Location, |
| bool Create) override; |
| |
| bool LookupInlineAsmField(StringRef Base, StringRef Member, |
| unsigned &Offset) override { |
| return TheParser.getActions().LookupInlineAsmField(Base, Member, Offset, |
| AsmLoc); |
| } |
| |
| static void DiagHandlerCallback(const llvm::SMDiagnostic &D, void *Context) { |
| ((ClangAsmParserCallback *)Context)->handleDiagnostic(D); |
| } |
| |
| private: |
| /// Collect the appropriate tokens for the given string. |
| void findTokensForString(StringRef Str, SmallVectorImpl<Token> &TempToks, |
| const Token *&FirstOrigToken) const; |
| |
| SourceLocation translateLocation(const llvm::SourceMgr &LSM, |
| llvm::SMLoc SMLoc); |
| |
| void handleDiagnostic(const llvm::SMDiagnostic &D); |
| }; |
| } |
| |
| void ClangAsmParserCallback::LookupInlineAsmIdentifier( |
| StringRef &LineBuf, llvm::InlineAsmIdentifierInfo &Info, |
| bool IsUnevaluatedContext) { |
| // Collect the desired tokens. |
| SmallVector<Token, 16> LineToks; |
| const Token *FirstOrigToken = nullptr; |
| findTokensForString(LineBuf, LineToks, FirstOrigToken); |
| |
| unsigned NumConsumedToks; |
| ExprResult Result = TheParser.ParseMSAsmIdentifier(LineToks, NumConsumedToks, |
| IsUnevaluatedContext); |
| |
| // If we consumed the entire line, tell MC that. |
| // Also do this if we consumed nothing as a way of reporting failure. |
| if (NumConsumedToks == 0 || NumConsumedToks == LineToks.size()) { |
| // By not modifying LineBuf, we're implicitly consuming it all. |
| |
| // Otherwise, consume up to the original tokens. |
| } else { |
| assert(FirstOrigToken && "not using original tokens?"); |
| |
| // Since we're using original tokens, apply that offset. |
| assert(FirstOrigToken[NumConsumedToks].getLocation() == |
| LineToks[NumConsumedToks].getLocation()); |
| unsigned FirstIndex = FirstOrigToken - AsmToks.begin(); |
| unsigned LastIndex = FirstIndex + NumConsumedToks - 1; |
| |
| // The total length we've consumed is the relative offset |
| // of the last token we consumed plus its length. |
| unsigned TotalOffset = |
| (AsmTokOffsets[LastIndex] + AsmToks[LastIndex].getLength() - |
| AsmTokOffsets[FirstIndex]); |
| LineBuf = LineBuf.substr(0, TotalOffset); |
| } |
| |
| // Initialize Info with the lookup result. |
| if (!Result.isUsable()) |
| return; |
| TheParser.getActions().FillInlineAsmIdentifierInfo(Result.get(), Info); |
| } |
| |
| StringRef ClangAsmParserCallback::LookupInlineAsmLabel(StringRef Identifier, |
| llvm::SourceMgr &LSM, |
| llvm::SMLoc Location, |
| bool Create) { |
| SourceLocation Loc = translateLocation(LSM, Location); |
| LabelDecl *Label = |
| TheParser.getActions().GetOrCreateMSAsmLabel(Identifier, Loc, Create); |
| return Label->getMSAsmLabel(); |
| } |
| |
| void ClangAsmParserCallback::findTokensForString( |
| StringRef Str, SmallVectorImpl<Token> &TempToks, |
| const Token *&FirstOrigToken) const { |
| // For now, assert that the string we're working with is a substring |
| // of what we gave to MC. This lets us use the original tokens. |
| assert(!std::less<const char *>()(Str.begin(), AsmString.begin()) && |
| !std::less<const char *>()(AsmString.end(), Str.end())); |
| |
| // Try to find a token whose offset matches the first token. |
| unsigned FirstCharOffset = Str.begin() - AsmString.begin(); |
| const unsigned *FirstTokOffset = |
| llvm::lower_bound(AsmTokOffsets, FirstCharOffset); |
| |
| // For now, assert that the start of the string exactly |
| // corresponds to the start of a token. |
| assert(*FirstTokOffset == FirstCharOffset); |
| |
| // Use all the original tokens for this line. (We assume the |
| // end of the line corresponds cleanly to a token break.) |
| unsigned FirstTokIndex = FirstTokOffset - AsmTokOffsets.begin(); |
| FirstOrigToken = &AsmToks[FirstTokIndex]; |
| unsigned LastCharOffset = Str.end() - AsmString.begin(); |
| for (unsigned i = FirstTokIndex, e = AsmTokOffsets.size(); i != e; ++i) { |
| if (AsmTokOffsets[i] >= LastCharOffset) |
| break; |
| TempToks.push_back(AsmToks[i]); |
| } |
| } |
| |
| SourceLocation |
| ClangAsmParserCallback::translateLocation(const llvm::SourceMgr &LSM, |
| llvm::SMLoc SMLoc) { |
| // 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::MemoryBuffer *LBuf = |
| LSM.getMemoryBuffer(LSM.FindBufferContainingLoc(SMLoc)); |
| unsigned Offset = SMLoc.getPointer() - LBuf->getBufferStart(); |
| |
| // Figure out which token that offset points into. |
| const unsigned *TokOffsetPtr = llvm::lower_bound(AsmTokOffsets, Offset); |
| unsigned TokIndex = TokOffsetPtr - AsmTokOffsets.begin(); |
| unsigned TokOffset = *TokOffsetPtr; |
| |
| // 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 - TokOffset); |
| } |
| return Loc; |
| } |
| |
| void ClangAsmParserCallback::handleDiagnostic(const llvm::SMDiagnostic &D) { |
| const llvm::SourceMgr &LSM = *D.getSourceMgr(); |
| SourceLocation Loc = translateLocation(LSM, D.getLoc()); |
| TheParser.Diag(Loc, diag::err_inline_ms_asm_parsing) << D.getMessage(); |
| } |
| |
| /// Parse an identifier in an MS-style inline assembly block. |
| ExprResult Parser::ParseMSAsmIdentifier(llvm::SmallVectorImpl<Token> &LineToks, |
| unsigned &NumLineToksConsumed, |
| bool IsUnevaluatedContext) { |
| // Push a fake token on the end so that we don't overrun the token |
| // stream. We use ';' because it expression-parsing should never |
| // overrun it. |
| const tok::TokenKind EndOfStream = tok::semi; |
| Token EndOfStreamTok; |
| EndOfStreamTok.startToken(); |
| EndOfStreamTok.setKind(EndOfStream); |
| LineToks.push_back(EndOfStreamTok); |
| |
| // Also copy the current token over. |
| LineToks.push_back(Tok); |
| |
| PP.EnterTokenStream(LineToks, /*DisableMacroExpansions*/ true, |
| /*IsReinject*/ true); |
| |
| // Clear the current token and advance to the first token in LineToks. |
| ConsumeAnyToken(); |
| |
| // Parse an optional scope-specifier if we're in C++. |
| CXXScopeSpec SS; |
| if (getLangOpts().CPlusPlus) |
| ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr, |
| /*ObjectHasErrors=*/false, |
| /*EnteringContext=*/false); |
| |
| // Require an identifier here. |
| SourceLocation TemplateKWLoc; |
| UnqualifiedId Id; |
| bool Invalid = true; |
| ExprResult Result; |
| if (Tok.is(tok::kw_this)) { |
| Result = ParseCXXThis(); |
| Invalid = false; |
| } else { |
| Invalid = |
| ParseUnqualifiedId(SS, /*ObjectType=*/nullptr, |
| /*ObjectHadErrors=*/false, |
| /*EnteringContext=*/false, |
| /*AllowDestructorName=*/false, |
| /*AllowConstructorName=*/false, |
| /*AllowDeductionGuide=*/false, &TemplateKWLoc, Id); |
| // Perform the lookup. |
| Result = Actions.LookupInlineAsmIdentifier(SS, TemplateKWLoc, Id, |
| IsUnevaluatedContext); |
| } |
| // While the next two tokens are 'period' 'identifier', repeatedly parse it as |
| // a field access. We have to avoid consuming assembler directives that look |
| // like '.' 'else'. |
| while (Result.isUsable() && Tok.is(tok::period)) { |
| Token IdTok = PP.LookAhead(0); |
| if (IdTok.isNot(tok::identifier)) |
| break; |
| ConsumeToken(); // Consume the period. |
| IdentifierInfo *Id = Tok.getIdentifierInfo(); |
| ConsumeToken(); // Consume the identifier. |
| Result = Actions.LookupInlineAsmVarDeclField(Result.get(), Id->getName(), |
| Tok.getLocation()); |
| } |
| |
| // Figure out how many tokens we are into LineToks. |
| unsigned LineIndex = 0; |
| if (Tok.is(EndOfStream)) { |
| LineIndex = LineToks.size() - 2; |
| } else { |
| while (LineToks[LineIndex].getLocation() != Tok.getLocation()) { |
| LineIndex++; |
| assert(LineIndex < LineToks.size() - 2); // we added two extra tokens |
| } |
| } |
| |
| // If we've run into the poison token we inserted before, or there |
| // was a parsing error, then claim the entire line. |
| if (Invalid || Tok.is(EndOfStream)) { |
| NumLineToksConsumed = LineToks.size() - 2; |
| } else { |
| // Otherwise, claim up to the start of the next token. |
| NumLineToksConsumed = LineIndex; |
| } |
| |
| // Finally, restore the old parsing state by consuming all the tokens we |
| // staged before, implicitly killing off the token-lexer we pushed. |
| for (unsigned i = 0, e = LineToks.size() - LineIndex - 2; i != e; ++i) { |
| ConsumeAnyToken(); |
| } |
| assert(Tok.is(EndOfStream)); |
| ConsumeToken(); |
| |
| // Leave LineToks in its original state. |
| LineToks.pop_back(); |
| LineToks.pop_back(); |
| |
| return Result; |
| } |
| |
| /// Turn a sequence of our tokens back into a string that we can hand |
| /// to the MC asm parser. |
| static bool buildMSAsmString(Preprocessor &PP, SourceLocation AsmLoc, |
| ArrayRef<Token> AsmToks, |
| SmallVectorImpl<unsigned> &TokOffsets, |
| SmallString<512> &Asm) { |
| assert(!AsmToks.empty() && "Didn't expect an empty AsmToks!"); |
| |
| // Is this the start of a new assembly statement? |
| bool isNewStatement = true; |
| |
| for (unsigned i = 0, e = AsmToks.size(); i < e; ++i) { |
| const Token &Tok = AsmToks[i]; |
| |
| // Start each new statement with a newline and a tab. |
| if (!isNewStatement && (Tok.is(tok::kw_asm) || Tok.isAtStartOfLine())) { |
| Asm += "\n\t"; |
| isNewStatement = true; |
| } |
| |
| // Preserve the existence of leading whitespace except at the |
| // start of a statement. |
| if (!isNewStatement && Tok.hasLeadingSpace()) |
| Asm += ' '; |
| |
| // Remember the offset of this token. |
| TokOffsets.push_back(Asm.size()); |
| |
| // Don't actually write '__asm' into the assembly stream. |
| if (Tok.is(tok::kw_asm)) { |
| // Complain about __asm at the end of the stream. |
| if (i + 1 == e) { |
| PP.Diag(AsmLoc, diag::err_asm_empty); |
| return true; |
| } |
| |
| continue; |
| } |
| |
| // Append the spelling of the token. |
| SmallString<32> SpellingBuffer; |
| bool SpellingInvalid = false; |
| Asm += PP.getSpelling(Tok, SpellingBuffer, &SpellingInvalid); |
| assert(!SpellingInvalid && "spelling was invalid after correct parse?"); |
| |
| // We are no longer at the start of a statement. |
| isNewStatement = false; |
| } |
| |
| // Ensure that the buffer is null-terminated. |
| Asm.push_back('\0'); |
| Asm.pop_back(); |
| |
| assert(TokOffsets.size() == AsmToks.size()); |
| return false; |
| } |
| |
| // Determine if this is a GCC-style asm statement. |
| bool Parser::isGCCAsmStatement(const Token &TokAfterAsm) const { |
| return TokAfterAsm.is(tok::l_paren) || isGNUAsmQualifier(TokAfterAsm); |
| } |
| |
| bool Parser::isGNUAsmQualifier(const Token &TokAfterAsm) const { |
| return getGNUAsmQualifier(TokAfterAsm) != GNUAsmQualifiers::AQ_unspecified; |
| } |
| |
| /// ParseMicrosoftAsmStatement. When -fms-extensions/-fasm-blocks is enabled, |
| /// this routine is called to collect the tokens for an MS asm statement. |
| /// |
| /// [MS] ms-asm-statement: |
| /// ms-asm-block |
| /// ms-asm-block ms-asm-statement |
| /// |
| /// [MS] ms-asm-block: |
| /// '__asm' ms-asm-line '\n' |
| /// '__asm' '{' ms-asm-instruction-block[opt] '}' ';'[opt] |
| /// |
| /// [MS] ms-asm-instruction-block |
| /// ms-asm-line |
| /// ms-asm-line '\n' ms-asm-instruction-block |
| /// |
| StmtResult Parser::ParseMicrosoftAsmStatement(SourceLocation AsmLoc) { |
| SourceManager &SrcMgr = PP.getSourceManager(); |
| SourceLocation EndLoc = AsmLoc; |
| SmallVector<Token, 4> AsmToks; |
| |
| bool SingleLineMode = true; |
| unsigned BraceNesting = 0; |
| unsigned short savedBraceCount = BraceCount; |
| bool InAsmComment = false; |
| FileID FID; |
| unsigned LineNo = 0; |
| unsigned NumTokensRead = 0; |
| SmallVector<SourceLocation, 4> LBraceLocs; |
| bool SkippedStartOfLine = false; |
| |
| if (Tok.is(tok::l_brace)) { |
| // Braced inline asm: consume the opening brace. |
| SingleLineMode = false; |
| BraceNesting = 1; |
| EndLoc = ConsumeBrace(); |
| LBraceLocs.push_back(EndLoc); |
| ++NumTokensRead; |
| } else { |
| // Single-line inline asm; compute which line it is on. |
| std::pair<FileID, unsigned> ExpAsmLoc = |
| SrcMgr.getDecomposedExpansionLoc(EndLoc); |
| FID = ExpAsmLoc.first; |
| LineNo = SrcMgr.getLineNumber(FID, ExpAsmLoc.second); |
| LBraceLocs.push_back(SourceLocation()); |
| } |
| |
| SourceLocation TokLoc = Tok.getLocation(); |
| do { |
| // If we hit EOF, we're done, period. |
| if (isEofOrEom()) |
| break; |
| |
| if (!InAsmComment && Tok.is(tok::l_brace)) { |
| // Consume the opening brace. |
| SkippedStartOfLine = Tok.isAtStartOfLine(); |
| AsmToks.push_back(Tok); |
| EndLoc = ConsumeBrace(); |
| BraceNesting++; |
| LBraceLocs.push_back(EndLoc); |
| TokLoc = Tok.getLocation(); |
| ++NumTokensRead; |
| continue; |
| } else if (!InAsmComment && Tok.is(tok::semi)) { |
| // A semicolon in an asm is the start of a comment. |
| InAsmComment = true; |
| if (!SingleLineMode) { |
| // Compute which line the comment is on. |
| std::pair<FileID, unsigned> ExpSemiLoc = |
| SrcMgr.getDecomposedExpansionLoc(TokLoc); |
| FID = ExpSemiLoc.first; |
| LineNo = SrcMgr.getLineNumber(FID, ExpSemiLoc.second); |
| } |
| } else if (SingleLineMode || InAsmComment) { |
| // If end-of-line is significant, check whether this token is on a |
| // new line. |
| std::pair<FileID, unsigned> ExpLoc = |
| SrcMgr.getDecomposedExpansionLoc(TokLoc); |
| if (ExpLoc.first != FID || |
| SrcMgr.getLineNumber(ExpLoc.first, ExpLoc.second) != LineNo) { |
| // If this is a single-line __asm, we're done, except if the next |
| // line is MS-style asm too, in which case we finish a comment |
| // if needed and then keep processing the next line as a single |
| // line __asm. |
| bool isAsm = Tok.is(tok::kw_asm); |
| if (SingleLineMode && (!isAsm || isGCCAsmStatement(NextToken()))) |
| break; |
| // We're no longer in a comment. |
| InAsmComment = false; |
| if (isAsm) { |
| // If this is a new __asm {} block we want to process it separately |
| // from the single-line __asm statements |
| if (PP.LookAhead(0).is(tok::l_brace)) |
| break; |
| LineNo = SrcMgr.getLineNumber(ExpLoc.first, ExpLoc.second); |
| SkippedStartOfLine = Tok.isAtStartOfLine(); |
| } else if (Tok.is(tok::semi)) { |
| // A multi-line asm-statement, where next line is a comment |
| InAsmComment = true; |
| FID = ExpLoc.first; |
| LineNo = SrcMgr.getLineNumber(FID, ExpLoc.second); |
| } |
| } else if (!InAsmComment && Tok.is(tok::r_brace)) { |
| // In MSVC mode, braces only participate in brace matching and |
| // separating the asm statements. This is an intentional |
| // departure from the Apple gcc behavior. |
| if (!BraceNesting) |
| break; |
| } |
| } |
| if (!InAsmComment && BraceNesting && Tok.is(tok::r_brace) && |
| BraceCount == (savedBraceCount + BraceNesting)) { |
| // Consume the closing brace. |
| SkippedStartOfLine = Tok.isAtStartOfLine(); |
| // Don't want to add the closing brace of the whole asm block |
| if (SingleLineMode || BraceNesting > 1) { |
| Tok.clearFlag(Token::LeadingSpace); |
| AsmToks.push_back(Tok); |
| } |
| EndLoc = ConsumeBrace(); |
| BraceNesting--; |
| // Finish if all of the opened braces in the inline asm section were |
| // consumed. |
| if (BraceNesting == 0 && !SingleLineMode) |
| break; |
| else { |
| LBraceLocs.pop_back(); |
| TokLoc = Tok.getLocation(); |
| ++NumTokensRead; |
| continue; |
| } |
| } |
| |
| // Consume the next token; make sure we don't modify the brace count etc. |
| // if we are in a comment. |
| EndLoc = TokLoc; |
| if (InAsmComment) |
| PP.Lex(Tok); |
| else { |
| // Set the token as the start of line if we skipped the original start |
| // of line token in case it was a nested brace. |
| if (SkippedStartOfLine) |
| Tok.setFlag(Token::StartOfLine); |
| AsmToks.push_back(Tok); |
| ConsumeAnyToken(); |
| } |
| TokLoc = Tok.getLocation(); |
| ++NumTokensRead; |
| SkippedStartOfLine = false; |
| } while (true); |
| |
| if (BraceNesting && BraceCount != savedBraceCount) { |
| // __asm without closing brace (this can happen at EOF). |
| for (unsigned i = 0; i < BraceNesting; ++i) { |
| Diag(Tok, diag::err_expected) << tok::r_brace; |
| Diag(LBraceLocs.back(), diag::note_matching) << tok::l_brace; |
| LBraceLocs.pop_back(); |
| } |
| return StmtError(); |
| } else if (NumTokensRead == 0) { |
| // Empty __asm. |
| Diag(Tok, diag::err_expected) << tok::l_brace; |
| return StmtError(); |
| } |
| |
| // Okay, prepare to use MC to parse the assembly. |
| SmallVector<StringRef, 4> ConstraintRefs; |
| SmallVector<Expr *, 4> Exprs; |
| SmallVector<StringRef, 4> ClobberRefs; |
| |
| // We need an actual supported target. |
| const llvm::Triple &TheTriple = Actions.Context.getTargetInfo().getTriple(); |
| const std::string &TT = TheTriple.getTriple(); |
| const llvm::Target *TheTarget = nullptr; |
| if (!TheTriple.isX86()) { |
| Diag(AsmLoc, diag::err_msasm_unsupported_arch) << TheTriple.getArchName(); |
| } else { |
| std::string Error; |
| TheTarget = llvm::TargetRegistry::lookupTarget(TT, Error); |
| if (!TheTarget) |
| Diag(AsmLoc, diag::err_msasm_unable_to_create_target) << Error; |
| } |
| |
| assert(!LBraceLocs.empty() && "Should have at least one location here"); |
| |
| SmallString<512> AsmString; |
| auto EmptyStmt = [&] { |
| return Actions.ActOnMSAsmStmt(AsmLoc, LBraceLocs[0], AsmToks, AsmString, |
| /*NumOutputs*/ 0, /*NumInputs*/ 0, |
| ConstraintRefs, ClobberRefs, Exprs, EndLoc); |
| }; |
| // If we don't support assembly, or the assembly is empty, we don't |
| // need to instantiate the AsmParser, etc. |
| if (!TheTarget || AsmToks.empty()) { |
| return EmptyStmt(); |
| } |
| |
| // Expand the tokens into a string buffer. |
| SmallVector<unsigned, 8> TokOffsets; |
| if (buildMSAsmString(PP, AsmLoc, AsmToks, TokOffsets, AsmString)) |
| return StmtError(); |
| |
| const TargetOptions &TO = Actions.Context.getTargetInfo().getTargetOpts(); |
| std::string FeaturesStr = |
| llvm::join(TO.Features.begin(), TO.Features.end(), ","); |
| |
| std::unique_ptr<llvm::MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TT)); |
| if (!MRI) { |
| Diag(AsmLoc, diag::err_msasm_unable_to_create_target) |
| << "target MC unavailable"; |
| return EmptyStmt(); |
| } |
| // FIXME: init MCOptions from sanitizer flags here. |
| llvm::MCTargetOptions MCOptions; |
| std::unique_ptr<llvm::MCAsmInfo> MAI( |
| TheTarget->createMCAsmInfo(*MRI, TT, MCOptions)); |
| // Get the instruction descriptor. |
| std::unique_ptr<llvm::MCInstrInfo> MII(TheTarget->createMCInstrInfo()); |
| std::unique_ptr<llvm::MCSubtargetInfo> STI( |
| TheTarget->createMCSubtargetInfo(TT, TO.CPU, FeaturesStr)); |
| // Target MCTargetDesc may not be linked in clang-based tools. |
| |
| if (!MAI || !MII || !STI) { |
| Diag(AsmLoc, diag::err_msasm_unable_to_create_target) |
| << "target MC unavailable"; |
| return EmptyStmt(); |
| } |
| |
| llvm::SourceMgr TempSrcMgr; |
| llvm::MCContext Ctx(TheTriple, MAI.get(), MRI.get(), STI.get(), &TempSrcMgr); |
| std::unique_ptr<llvm::MCObjectFileInfo> MOFI( |
| TheTarget->createMCObjectFileInfo(Ctx, /*PIC=*/false)); |
| Ctx.setObjectFileInfo(MOFI.get()); |
| |
| std::unique_ptr<llvm::MemoryBuffer> Buffer = |
| llvm::MemoryBuffer::getMemBuffer(AsmString, "<MS inline asm>"); |
| |
| // Tell SrcMgr about this buffer, which is what the parser will pick up. |
| TempSrcMgr.AddNewSourceBuffer(std::move(Buffer), llvm::SMLoc()); |
| |
| std::unique_ptr<llvm::MCStreamer> Str(createNullStreamer(Ctx)); |
| std::unique_ptr<llvm::MCAsmParser> Parser( |
| createMCAsmParser(TempSrcMgr, Ctx, *Str.get(), *MAI)); |
| |
| std::unique_ptr<llvm::MCTargetAsmParser> TargetParser( |
| TheTarget->createMCAsmParser(*STI, *Parser, *MII, MCOptions)); |
| // Target AsmParser may not be linked in clang-based tools. |
| if (!TargetParser) { |
| Diag(AsmLoc, diag::err_msasm_unable_to_create_target) |
| << "target ASM parser unavailable"; |
| return EmptyStmt(); |
| } |
| |
| std::unique_ptr<llvm::MCInstPrinter> IP( |
| TheTarget->createMCInstPrinter(llvm::Triple(TT), 1, *MAI, *MII, *MRI)); |
| |
| // Change to the Intel dialect. |
| Parser->setAssemblerDialect(1); |
| Parser->setTargetParser(*TargetParser.get()); |
| Parser->setParsingMSInlineAsm(true); |
| TargetParser->setParsingMSInlineAsm(true); |
| |
| ClangAsmParserCallback Callback(*this, AsmLoc, AsmString, AsmToks, |
| TokOffsets); |
| TargetParser->setSemaCallback(&Callback); |
| TempSrcMgr.setDiagHandler(ClangAsmParserCallback::DiagHandlerCallback, |
| &Callback); |
| |
| unsigned NumOutputs; |
| unsigned NumInputs; |
| std::string AsmStringIR; |
| SmallVector<std::pair<void *, bool>, 4> OpExprs; |
| SmallVector<std::string, 4> Constraints; |
| SmallVector<std::string, 4> Clobbers; |
| if (Parser->parseMSInlineAsm(AsmStringIR, NumOutputs, NumInputs, OpExprs, |
| Constraints, Clobbers, MII.get(), IP.get(), |
| Callback)) |
| return StmtError(); |
| |
| // Filter out "fpsw" and "mxcsr". They aren't valid GCC asm clobber |
| // constraints. Clang always adds fpsr to the clobber list anyway. |
| llvm::erase_if(Clobbers, [](const std::string &C) { |
| return C == "fpsr" || C == "mxcsr"; |
| }); |
| |
| // Build the vector of clobber StringRefs. |
| ClobberRefs.insert(ClobberRefs.end(), Clobbers.begin(), Clobbers.end()); |
| |
| // Recast the void pointers and build the vector of constraint StringRefs. |
| unsigned NumExprs = NumOutputs + NumInputs; |
| ConstraintRefs.resize(NumExprs); |
| Exprs.resize(NumExprs); |
| for (unsigned i = 0, e = NumExprs; i != e; ++i) { |
| Expr *OpExpr = static_cast<Expr *>(OpExprs[i].first); |
| if (!OpExpr) |
| return StmtError(); |
| |
| // Need address of variable. |
| if (OpExprs[i].second) |
| OpExpr = |
| Actions.BuildUnaryOp(getCurScope(), AsmLoc, UO_AddrOf, OpExpr).get(); |
| |
| ConstraintRefs[i] = StringRef(Constraints[i]); |
| Exprs[i] = OpExpr; |
| } |
| |
| // FIXME: We should be passing source locations for better diagnostics. |
| return Actions.ActOnMSAsmStmt(AsmLoc, LBraceLocs[0], AsmToks, AsmStringIR, |
| NumOutputs, NumInputs, ConstraintRefs, |
| ClobberRefs, Exprs, EndLoc); |
| } |
| |
| /// parseGNUAsmQualifierListOpt - Parse a GNU extended asm qualifier list. |
| /// asm-qualifier: |
| /// volatile |
| /// inline |
| /// goto |
| /// |
| /// asm-qualifier-list: |
| /// asm-qualifier |
| /// asm-qualifier-list asm-qualifier |
| bool Parser::parseGNUAsmQualifierListOpt(GNUAsmQualifiers &AQ) { |
| while (true) { |
| const GNUAsmQualifiers::AQ A = getGNUAsmQualifier(Tok); |
| if (A == GNUAsmQualifiers::AQ_unspecified) { |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(Tok.getLocation(), diag::err_asm_qualifier_ignored); |
| SkipUntil(tok::r_paren, StopAtSemi); |
| return true; |
| } |
| return false; |
| } |
| if (AQ.setAsmQualifier(A)) |
| Diag(Tok.getLocation(), diag::err_asm_duplicate_qual) |
| << GNUAsmQualifiers::getQualifierName(A); |
| ConsumeToken(); |
| } |
| return false; |
| } |
| |
| /// ParseAsmStatement - Parse a GNU extended asm statement. |
| /// asm-statement: |
| /// gnu-asm-statement |
| /// ms-asm-statement |
| /// |
| /// [GNU] gnu-asm-statement: |
| /// 'asm' asm-qualifier-list[opt] '(' asm-argument ')' ';' |
| /// |
| /// [GNU] asm-argument: |
| /// asm-string-literal |
| /// asm-string-literal ':' asm-operands[opt] |
| /// asm-string-literal ':' asm-operands[opt] ':' asm-operands[opt] |
| /// asm-string-literal ':' asm-operands[opt] ':' asm-operands[opt] |
| /// ':' asm-clobbers |
| /// |
| /// [GNU] asm-clobbers: |
| /// asm-string-literal |
| /// asm-clobbers ',' asm-string-literal |
| /// |
| StmtResult Parser::ParseAsmStatement(bool &msAsm) { |
| assert(Tok.is(tok::kw_asm) && "Not an asm stmt"); |
| SourceLocation AsmLoc = ConsumeToken(); |
| |
| if (getLangOpts().AsmBlocks && !isGCCAsmStatement(Tok)) { |
| msAsm = true; |
| return ParseMicrosoftAsmStatement(AsmLoc); |
| } |
| |
| SourceLocation Loc = Tok.getLocation(); |
| GNUAsmQualifiers GAQ; |
| if (parseGNUAsmQualifierListOpt(GAQ)) |
| return StmtError(); |
| |
| if (GAQ.isGoto() && getLangOpts().SpeculativeLoadHardening) |
| Diag(Loc, diag::warn_slh_does_not_support_asm_goto); |
| |
| BalancedDelimiterTracker T(*this, tok::l_paren); |
| T.consumeOpen(); |
| |
| ExprResult AsmString(ParseAsmStringLiteral(/*ForAsmLabel*/ false)); |
| |
| // Check if GNU-style InlineAsm is disabled. |
| // Error on anything other than empty string. |
| if (!(getLangOpts().GNUAsm || AsmString.isInvalid())) { |
| const auto *SL = cast<StringLiteral>(AsmString.get()); |
| if (!SL->getString().trim().empty()) |
| Diag(Loc, diag::err_gnu_inline_asm_disabled); |
| } |
| |
| if (AsmString.isInvalid()) { |
| // Consume up to and including the closing paren. |
| T.skipToEnd(); |
| return StmtError(); |
| } |
| |
| SmallVector<IdentifierInfo *, 4> Names; |
| ExprVector Constraints; |
| ExprVector Exprs; |
| ExprVector Clobbers; |
| |
| if (Tok.is(tok::r_paren)) { |
| // We have a simple asm expression like 'asm("foo")'. |
| T.consumeClose(); |
| return Actions.ActOnGCCAsmStmt( |
| AsmLoc, /*isSimple*/ true, GAQ.isVolatile(), |
| /*NumOutputs*/ 0, /*NumInputs*/ 0, nullptr, Constraints, Exprs, |
| AsmString.get(), Clobbers, /*NumLabels*/ 0, T.getCloseLocation()); |
| } |
| |
| // Parse Outputs, if present. |
| bool AteExtraColon = false; |
| if (Tok.is(tok::colon) || Tok.is(tok::coloncolon)) { |
| // In C++ mode, parse "::" like ": :". |
| AteExtraColon = Tok.is(tok::coloncolon); |
| ConsumeToken(); |
| |
| if (!AteExtraColon && ParseAsmOperandsOpt(Names, Constraints, Exprs)) |
| return StmtError(); |
| } |
| |
| unsigned NumOutputs = Names.size(); |
| |
| // Parse Inputs, if present. |
| if (AteExtraColon || Tok.is(tok::colon) || Tok.is(tok::coloncolon)) { |
| // In C++ mode, parse "::" like ": :". |
| if (AteExtraColon) |
| AteExtraColon = false; |
| else { |
| AteExtraColon = Tok.is(tok::coloncolon); |
| ConsumeToken(); |
| } |
| |
| if (!AteExtraColon && ParseAsmOperandsOpt(Names, Constraints, Exprs)) |
| return StmtError(); |
| } |
| |
| assert(Names.size() == Constraints.size() && |
| Constraints.size() == Exprs.size() && "Input operand size mismatch!"); |
| |
| unsigned NumInputs = Names.size() - NumOutputs; |
| |
| // Parse the clobbers, if present. |
| if (AteExtraColon || Tok.is(tok::colon) || Tok.is(tok::coloncolon)) { |
| if (AteExtraColon) |
| AteExtraColon = false; |
| else { |
| AteExtraColon = Tok.is(tok::coloncolon); |
| ConsumeToken(); |
| } |
| // Parse the asm-string list for clobbers if present. |
| if (!AteExtraColon && isTokenStringLiteral()) { |
| while (true) { |
| ExprResult Clobber(ParseAsmStringLiteral(/*ForAsmLabel*/ false)); |
| |
| if (Clobber.isInvalid()) |
| break; |
| |
| Clobbers.push_back(Clobber.get()); |
| |
| if (!TryConsumeToken(tok::comma)) |
| break; |
| } |
| } |
| } |
| if (!GAQ.isGoto() && (Tok.isNot(tok::r_paren) || AteExtraColon)) { |
| Diag(Tok, diag::err_expected) << tok::r_paren; |
| SkipUntil(tok::r_paren, StopAtSemi); |
| return StmtError(); |
| } |
| |
| // Parse the goto label, if present. |
| unsigned NumLabels = 0; |
| if (AteExtraColon || Tok.is(tok::colon)) { |
| if (!AteExtraColon) |
| ConsumeToken(); |
| |
| while (true) { |
| if (Tok.isNot(tok::identifier)) { |
| Diag(Tok, diag::err_expected) << tok::identifier; |
| SkipUntil(tok::r_paren, StopAtSemi); |
| return StmtError(); |
| } |
| LabelDecl *LD = Actions.LookupOrCreateLabel(Tok.getIdentifierInfo(), |
| Tok.getLocation()); |
| Names.push_back(Tok.getIdentifierInfo()); |
| if (!LD) { |
| SkipUntil(tok::r_paren, StopAtSemi); |
| return StmtError(); |
| } |
| ExprResult Res = |
| Actions.ActOnAddrLabel(Tok.getLocation(), Tok.getLocation(), LD); |
| Exprs.push_back(Res.get()); |
| NumLabels++; |
| ConsumeToken(); |
| if (!TryConsumeToken(tok::comma)) |
| break; |
| } |
| } else if (GAQ.isGoto()) { |
| Diag(Tok, diag::err_expected) << tok::colon; |
| SkipUntil(tok::r_paren, StopAtSemi); |
| return StmtError(); |
| } |
| T.consumeClose(); |
| return Actions.ActOnGCCAsmStmt(AsmLoc, false, GAQ.isVolatile(), NumOutputs, |
| NumInputs, Names.data(), Constraints, Exprs, |
| AsmString.get(), Clobbers, NumLabels, |
| T.getCloseLocation()); |
| } |
| |
| /// ParseAsmOperands - Parse the asm-operands production as used by |
| /// asm-statement, assuming the leading ':' token was eaten. |
| /// |
| /// [GNU] asm-operands: |
| /// asm-operand |
| /// asm-operands ',' asm-operand |
| /// |
| /// [GNU] asm-operand: |
| /// asm-string-literal '(' expression ')' |
| /// '[' identifier ']' asm-string-literal '(' expression ')' |
| /// |
| // |
| // FIXME: Avoid unnecessary std::string trashing. |
| bool Parser::ParseAsmOperandsOpt(SmallVectorImpl<IdentifierInfo *> &Names, |
| SmallVectorImpl<Expr *> &Constraints, |
| SmallVectorImpl<Expr *> &Exprs) { |
| // 'asm-operands' isn't present? |
| if (!isTokenStringLiteral() && Tok.isNot(tok::l_square)) |
| return false; |
| |
| while (true) { |
| // Read the [id] if present. |
| if (Tok.is(tok::l_square)) { |
| BalancedDelimiterTracker T(*this, tok::l_square); |
| T.consumeOpen(); |
| |
| if (Tok.isNot(tok::identifier)) { |
| Diag(Tok, diag::err_expected) << tok::identifier; |
| SkipUntil(tok::r_paren, StopAtSemi); |
| return true; |
| } |
| |
| IdentifierInfo *II = Tok.getIdentifierInfo(); |
| ConsumeToken(); |
| |
| Names.push_back(II); |
| T.consumeClose(); |
| } else |
| Names.push_back(nullptr); |
| |
| ExprResult Constraint(ParseAsmStringLiteral(/*ForAsmLabel*/ false)); |
| if (Constraint.isInvalid()) { |
| SkipUntil(tok::r_paren, StopAtSemi); |
| return true; |
| } |
| Constraints.push_back(Constraint.get()); |
| |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(Tok, diag::err_expected_lparen_after) << "asm operand"; |
| SkipUntil(tok::r_paren, StopAtSemi); |
| return true; |
| } |
| |
| // Read the parenthesized expression. |
| BalancedDelimiterTracker T(*this, tok::l_paren); |
| T.consumeOpen(); |
| ExprResult Res = Actions.CorrectDelayedTyposInExpr(ParseExpression()); |
| T.consumeClose(); |
| if (Res.isInvalid()) { |
| SkipUntil(tok::r_paren, StopAtSemi); |
| return true; |
| } |
| Exprs.push_back(Res.get()); |
| // Eat the comma and continue parsing if it exists. |
| if (!TryConsumeToken(tok::comma)) |
| return false; |
| } |
| } |
| |
| const char *Parser::GNUAsmQualifiers::getQualifierName(AQ Qualifier) { |
| switch (Qualifier) { |
| case AQ_volatile: return "volatile"; |
| case AQ_inline: return "inline"; |
| case AQ_goto: return "goto"; |
| case AQ_unspecified: return "unspecified"; |
| } |
| llvm_unreachable("Unknown GNUAsmQualifier"); |
| } |
| |
| Parser::GNUAsmQualifiers::AQ |
| Parser::getGNUAsmQualifier(const Token &Tok) const { |
| switch (Tok.getKind()) { |
| case tok::kw_volatile: return GNUAsmQualifiers::AQ_volatile; |
| case tok::kw_inline: return GNUAsmQualifiers::AQ_inline; |
| case tok::kw_goto: return GNUAsmQualifiers::AQ_goto; |
| default: return GNUAsmQualifiers::AQ_unspecified; |
| } |
| } |
| bool Parser::GNUAsmQualifiers::setAsmQualifier(AQ Qualifier) { |
| bool IsDuplicate = Qualifiers & Qualifier; |
| Qualifiers |= Qualifier; |
| return IsDuplicate; |
| } |
