| //===- AsmParser.cpp - Parser for Assembly Files --------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This class implements the parser for assembly files. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/ADT/APFloat.h" |
| #include "llvm/ADT/SmallString.h" |
| #include "llvm/ADT/StringMap.h" |
| #include "llvm/ADT/StringSwitch.h" |
| #include "llvm/ADT/Twine.h" |
| #include "llvm/MC/MCAsmInfo.h" |
| #include "llvm/MC/MCContext.h" |
| #include "llvm/MC/MCDwarf.h" |
| #include "llvm/MC/MCExpr.h" |
| #include "llvm/MC/MCParser/AsmCond.h" |
| #include "llvm/MC/MCParser/AsmLexer.h" |
| #include "llvm/MC/MCParser/MCAsmParser.h" |
| #include "llvm/MC/MCParser/MCParsedAsmOperand.h" |
| #include "llvm/MC/MCRegisterInfo.h" |
| #include "llvm/MC/MCSectionMachO.h" |
| #include "llvm/MC/MCStreamer.h" |
| #include "llvm/MC/MCSymbol.h" |
| #include "llvm/MC/MCTargetAsmParser.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/MathExtras.h" |
| #include "llvm/Support/MemoryBuffer.h" |
| #include "llvm/Support/SourceMgr.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include <cctype> |
| #include <vector> |
| using namespace llvm; |
| |
| static cl::opt<bool> |
| FatalAssemblerWarnings("fatal-assembler-warnings", |
| cl::desc("Consider warnings as error")); |
| |
| namespace { |
| |
| /// \brief Helper class for tracking macro definitions. |
| struct Macro { |
| StringRef Name; |
| StringRef Body; |
| std::vector<StringRef> Parameters; |
| |
| public: |
| Macro(StringRef N, StringRef B, const std::vector<StringRef> &P) : |
| Name(N), Body(B), Parameters(P) {} |
| }; |
| |
| /// \brief Helper class for storing information about an active macro |
| /// instantiation. |
| struct MacroInstantiation { |
| /// The macro being instantiated. |
| const Macro *TheMacro; |
| |
| /// The macro instantiation with substitutions. |
| MemoryBuffer *Instantiation; |
| |
| /// The location of the instantiation. |
| SMLoc InstantiationLoc; |
| |
| /// The location where parsing should resume upon instantiation completion. |
| SMLoc ExitLoc; |
| |
| public: |
| MacroInstantiation(const Macro *M, SMLoc IL, SMLoc EL, |
| MemoryBuffer *I); |
| }; |
| |
| /// \brief The concrete assembly parser instance. |
| class AsmParser : public MCAsmParser { |
| friend class GenericAsmParser; |
| |
| AsmParser(const AsmParser &); // DO NOT IMPLEMENT |
| void operator=(const AsmParser &); // DO NOT IMPLEMENT |
| private: |
| AsmLexer Lexer; |
| MCContext &Ctx; |
| MCStreamer &Out; |
| const MCAsmInfo &MAI; |
| SourceMgr &SrcMgr; |
| SourceMgr::DiagHandlerTy SavedDiagHandler; |
| void *SavedDiagContext; |
| MCAsmParserExtension *GenericParser; |
| MCAsmParserExtension *PlatformParser; |
| |
| /// This is the current buffer index we're lexing from as managed by the |
| /// SourceMgr object. |
| int CurBuffer; |
| |
| AsmCond TheCondState; |
| std::vector<AsmCond> TheCondStack; |
| |
| /// DirectiveMap - This is a table handlers for directives. Each handler is |
| /// invoked after the directive identifier is read and is responsible for |
| /// parsing and validating the rest of the directive. The handler is passed |
| /// in the directive name and the location of the directive keyword. |
| StringMap<std::pair<MCAsmParserExtension*, DirectiveHandler> > DirectiveMap; |
| |
| /// MacroMap - Map of currently defined macros. |
| StringMap<Macro*> MacroMap; |
| |
| /// ActiveMacros - Stack of active macro instantiations. |
| std::vector<MacroInstantiation*> ActiveMacros; |
| |
| /// Boolean tracking whether macro substitution is enabled. |
| unsigned MacrosEnabled : 1; |
| |
| /// Flag tracking whether any errors have been encountered. |
| unsigned HadError : 1; |
| |
| /// The values from the last parsed cpp hash file line comment if any. |
| StringRef CppHashFilename; |
| int64_t CppHashLineNumber; |
| SMLoc CppHashLoc; |
| |
| public: |
| AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out, |
| const MCAsmInfo &MAI); |
| ~AsmParser(); |
| |
| virtual bool Run(bool NoInitialTextSection, bool NoFinalize = false); |
| |
| void AddDirectiveHandler(MCAsmParserExtension *Object, |
| StringRef Directive, |
| DirectiveHandler Handler) { |
| DirectiveMap[Directive] = std::make_pair(Object, Handler); |
| } |
| |
| public: |
| /// @name MCAsmParser Interface |
| /// { |
| |
| virtual SourceMgr &getSourceManager() { return SrcMgr; } |
| virtual MCAsmLexer &getLexer() { return Lexer; } |
| virtual MCContext &getContext() { return Ctx; } |
| virtual MCStreamer &getStreamer() { return Out; } |
| |
| virtual bool Warning(SMLoc L, const Twine &Msg, |
| ArrayRef<SMRange> Ranges = ArrayRef<SMRange>()); |
| virtual bool Error(SMLoc L, const Twine &Msg, |
| ArrayRef<SMRange> Ranges = ArrayRef<SMRange>()); |
| |
| const AsmToken &Lex(); |
| |
| bool ParseExpression(const MCExpr *&Res); |
| virtual bool ParseExpression(const MCExpr *&Res, SMLoc &EndLoc); |
| virtual bool ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc); |
| virtual bool ParseAbsoluteExpression(int64_t &Res); |
| |
| /// } |
| |
| private: |
| void CheckForValidSection(); |
| |
| bool ParseStatement(); |
| void EatToEndOfLine(); |
| bool ParseCppHashLineFilenameComment(const SMLoc &L); |
| |
| bool HandleMacroEntry(StringRef Name, SMLoc NameLoc, const Macro *M); |
| bool expandMacro(SmallString<256> &Buf, StringRef Body, |
| const std::vector<StringRef> &Parameters, |
| const std::vector<std::vector<AsmToken> > &A, |
| const SMLoc &L); |
| void HandleMacroExit(); |
| |
| void PrintMacroInstantiations(); |
| void PrintMessage(SMLoc Loc, SourceMgr::DiagKind Kind, const Twine &Msg, |
| ArrayRef<SMRange> Ranges = ArrayRef<SMRange>()) const { |
| SrcMgr.PrintMessage(Loc, Kind, Msg, Ranges); |
| } |
| static void DiagHandler(const SMDiagnostic &Diag, void *Context); |
| |
| /// EnterIncludeFile - Enter the specified file. This returns true on failure. |
| bool EnterIncludeFile(const std::string &Filename); |
| /// ProcessIncbinFile - Process the specified file for the .incbin directive. |
| /// This returns true on failure. |
| bool ProcessIncbinFile(const std::string &Filename); |
| |
| /// \brief Reset the current lexer position to that given by \arg Loc. The |
| /// current token is not set; clients should ensure Lex() is called |
| /// subsequently. |
| void JumpToLoc(SMLoc Loc); |
| |
| void EatToEndOfStatement(); |
| |
| /// \brief Parse up to the end of statement and a return the contents from the |
| /// current token until the end of the statement; the current token on exit |
| /// will be either the EndOfStatement or EOF. |
| StringRef ParseStringToEndOfStatement(); |
| |
| bool ParseAssignment(StringRef Name, bool allow_redef); |
| |
| bool ParsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc); |
| bool ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc); |
| bool ParseParenExpr(const MCExpr *&Res, SMLoc &EndLoc); |
| bool ParseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc); |
| |
| /// ParseIdentifier - Parse an identifier or string (as a quoted identifier) |
| /// and set \arg Res to the identifier contents. |
| bool ParseIdentifier(StringRef &Res); |
| |
| // Directive Parsing. |
| |
| // ".ascii", ".asciiz", ".string" |
| bool ParseDirectiveAscii(StringRef IDVal, bool ZeroTerminated); |
| bool ParseDirectiveValue(unsigned Size); // ".byte", ".long", ... |
| bool ParseDirectiveRealValue(const fltSemantics &); // ".single", ... |
| bool ParseDirectiveFill(); // ".fill" |
| bool ParseDirectiveSpace(); // ".space" |
| bool ParseDirectiveZero(); // ".zero" |
| bool ParseDirectiveSet(StringRef IDVal, bool allow_redef); // ".set", ".equ", ".equiv" |
| bool ParseDirectiveOrg(); // ".org" |
| // ".align{,32}", ".p2align{,w,l}" |
| bool ParseDirectiveAlign(bool IsPow2, unsigned ValueSize); |
| |
| /// ParseDirectiveSymbolAttribute - Parse a directive like ".globl" which |
| /// accepts a single symbol (which should be a label or an external). |
| bool ParseDirectiveSymbolAttribute(MCSymbolAttr Attr); |
| |
| bool ParseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm" |
| |
| bool ParseDirectiveAbort(); // ".abort" |
| bool ParseDirectiveInclude(); // ".include" |
| bool ParseDirectiveIncbin(); // ".incbin" |
| |
| bool ParseDirectiveIf(SMLoc DirectiveLoc); // ".if" |
| // ".ifdef" or ".ifndef", depending on expect_defined |
| bool ParseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined); |
| bool ParseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif" |
| bool ParseDirectiveElse(SMLoc DirectiveLoc); // ".else" |
| bool ParseDirectiveEndIf(SMLoc DirectiveLoc); // .endif |
| |
| /// ParseEscapedString - Parse the current token as a string which may include |
| /// escaped characters and return the string contents. |
| bool ParseEscapedString(std::string &Data); |
| |
| const MCExpr *ApplyModifierToExpr(const MCExpr *E, |
| MCSymbolRefExpr::VariantKind Variant); |
| }; |
| |
| /// \brief Generic implementations of directive handling, etc. which is shared |
| /// (or the default, at least) for all assembler parser. |
| class GenericAsmParser : public MCAsmParserExtension { |
| template<bool (GenericAsmParser::*Handler)(StringRef, SMLoc)> |
| void AddDirectiveHandler(StringRef Directive) { |
| getParser().AddDirectiveHandler(this, Directive, |
| HandleDirective<GenericAsmParser, Handler>); |
| } |
| public: |
| GenericAsmParser() {} |
| |
| AsmParser &getParser() { |
| return (AsmParser&) this->MCAsmParserExtension::getParser(); |
| } |
| |
| virtual void Initialize(MCAsmParser &Parser) { |
| // Call the base implementation. |
| this->MCAsmParserExtension::Initialize(Parser); |
| |
| // Debugging directives. |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveFile>(".file"); |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLine>(".line"); |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLoc>(".loc"); |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveStabs>(".stabs"); |
| |
| // CFI directives. |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFISections>( |
| ".cfi_sections"); |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIStartProc>( |
| ".cfi_startproc"); |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIEndProc>( |
| ".cfi_endproc"); |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIDefCfa>( |
| ".cfi_def_cfa"); |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIDefCfaOffset>( |
| ".cfi_def_cfa_offset"); |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIAdjustCfaOffset>( |
| ".cfi_adjust_cfa_offset"); |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIDefCfaRegister>( |
| ".cfi_def_cfa_register"); |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIOffset>( |
| ".cfi_offset"); |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIRelOffset>( |
| ".cfi_rel_offset"); |
| AddDirectiveHandler< |
| &GenericAsmParser::ParseDirectiveCFIPersonalityOrLsda>(".cfi_personality"); |
| AddDirectiveHandler< |
| &GenericAsmParser::ParseDirectiveCFIPersonalityOrLsda>(".cfi_lsda"); |
| AddDirectiveHandler< |
| &GenericAsmParser::ParseDirectiveCFIRememberState>(".cfi_remember_state"); |
| AddDirectiveHandler< |
| &GenericAsmParser::ParseDirectiveCFIRestoreState>(".cfi_restore_state"); |
| AddDirectiveHandler< |
| &GenericAsmParser::ParseDirectiveCFISameValue>(".cfi_same_value"); |
| AddDirectiveHandler< |
| &GenericAsmParser::ParseDirectiveCFIRestore>(".cfi_restore"); |
| AddDirectiveHandler< |
| &GenericAsmParser::ParseDirectiveCFIEscape>(".cfi_escape"); |
| |
| // Macro directives. |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveMacrosOnOff>( |
| ".macros_on"); |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveMacrosOnOff>( |
| ".macros_off"); |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveMacro>(".macro"); |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveEndMacro>(".endm"); |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveEndMacro>(".endmacro"); |
| |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLEB128>(".sleb128"); |
| AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLEB128>(".uleb128"); |
| } |
| |
| bool ParseRegisterOrRegisterNumber(int64_t &Register, SMLoc DirectiveLoc); |
| |
| bool ParseDirectiveFile(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveLine(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveLoc(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveStabs(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveCFISections(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveCFIStartProc(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveCFIEndProc(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveCFIDefCfa(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveCFIDefCfaOffset(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveCFIAdjustCfaOffset(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveCFIDefCfaRegister(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveCFIOffset(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveCFIRelOffset(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveCFIPersonalityOrLsda(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveCFIRememberState(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveCFIRestoreState(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveCFISameValue(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveCFIRestore(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveCFIEscape(StringRef, SMLoc DirectiveLoc); |
| |
| bool ParseDirectiveMacrosOnOff(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveMacro(StringRef, SMLoc DirectiveLoc); |
| bool ParseDirectiveEndMacro(StringRef, SMLoc DirectiveLoc); |
| |
| bool ParseDirectiveLEB128(StringRef, SMLoc); |
| }; |
| |
| } |
| |
| namespace llvm { |
| |
| extern MCAsmParserExtension *createDarwinAsmParser(); |
| extern MCAsmParserExtension *createELFAsmParser(); |
| extern MCAsmParserExtension *createCOFFAsmParser(); |
| |
| } |
| |
| enum { DEFAULT_ADDRSPACE = 0 }; |
| |
| AsmParser::AsmParser(SourceMgr &_SM, MCContext &_Ctx, |
| MCStreamer &_Out, const MCAsmInfo &_MAI) |
| : Lexer(_MAI), Ctx(_Ctx), Out(_Out), MAI(_MAI), SrcMgr(_SM), |
| GenericParser(new GenericAsmParser), PlatformParser(0), |
| CurBuffer(0), MacrosEnabled(true), CppHashLineNumber(0) { |
| // Save the old handler. |
| SavedDiagHandler = SrcMgr.getDiagHandler(); |
| SavedDiagContext = SrcMgr.getDiagContext(); |
| // Set our own handler which calls the saved handler. |
| SrcMgr.setDiagHandler(DiagHandler, this); |
| Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)); |
| |
| // Initialize the generic parser. |
| GenericParser->Initialize(*this); |
| |
| // Initialize the platform / file format parser. |
| // |
| // FIXME: This is a hack, we need to (majorly) cleanup how these objects are |
| // created. |
| if (_MAI.hasMicrosoftFastStdCallMangling()) { |
| PlatformParser = createCOFFAsmParser(); |
| PlatformParser->Initialize(*this); |
| } else if (_MAI.hasSubsectionsViaSymbols()) { |
| PlatformParser = createDarwinAsmParser(); |
| PlatformParser->Initialize(*this); |
| } else { |
| PlatformParser = createELFAsmParser(); |
| PlatformParser->Initialize(*this); |
| } |
| } |
| |
| AsmParser::~AsmParser() { |
| assert(ActiveMacros.empty() && "Unexpected active macro instantiation!"); |
| |
| // Destroy any macros. |
| for (StringMap<Macro*>::iterator it = MacroMap.begin(), |
| ie = MacroMap.end(); it != ie; ++it) |
| delete it->getValue(); |
| |
| delete PlatformParser; |
| delete GenericParser; |
| } |
| |
| void AsmParser::PrintMacroInstantiations() { |
| // Print the active macro instantiation stack. |
| for (std::vector<MacroInstantiation*>::const_reverse_iterator |
| it = ActiveMacros.rbegin(), ie = ActiveMacros.rend(); it != ie; ++it) |
| PrintMessage((*it)->InstantiationLoc, SourceMgr::DK_Note, |
| "while in macro instantiation"); |
| } |
| |
| bool AsmParser::Warning(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) { |
| if (FatalAssemblerWarnings) |
| return Error(L, Msg, Ranges); |
| PrintMessage(L, SourceMgr::DK_Warning, Msg, Ranges); |
| PrintMacroInstantiations(); |
| return false; |
| } |
| |
| bool AsmParser::Error(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) { |
| HadError = true; |
| PrintMessage(L, SourceMgr::DK_Error, Msg, Ranges); |
| PrintMacroInstantiations(); |
| return true; |
| } |
| |
| bool AsmParser::EnterIncludeFile(const std::string &Filename) { |
| std::string IncludedFile; |
| int NewBuf = SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile); |
| if (NewBuf == -1) |
| return true; |
| |
| CurBuffer = NewBuf; |
| |
| Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)); |
| |
| return false; |
| } |
| |
| /// Process the specified .incbin file by seaching for it in the include paths |
| /// then just emiting the byte contents of the file to the streamer. This |
| /// returns true on failure. |
| bool AsmParser::ProcessIncbinFile(const std::string &Filename) { |
| std::string IncludedFile; |
| int NewBuf = SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile); |
| if (NewBuf == -1) |
| return true; |
| |
| // Pick up the bytes from the file and emit them. |
| getStreamer().EmitBytes(SrcMgr.getMemoryBuffer(NewBuf)->getBuffer(), |
| DEFAULT_ADDRSPACE); |
| return false; |
| } |
| |
| void AsmParser::JumpToLoc(SMLoc Loc) { |
| CurBuffer = SrcMgr.FindBufferContainingLoc(Loc); |
| Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer), Loc.getPointer()); |
| } |
| |
| const AsmToken &AsmParser::Lex() { |
| const AsmToken *tok = &Lexer.Lex(); |
| |
| if (tok->is(AsmToken::Eof)) { |
| // If this is the end of an included file, pop the parent file off the |
| // include stack. |
| SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer); |
| if (ParentIncludeLoc != SMLoc()) { |
| JumpToLoc(ParentIncludeLoc); |
| tok = &Lexer.Lex(); |
| } |
| } |
| |
| if (tok->is(AsmToken::Error)) |
| Error(Lexer.getErrLoc(), Lexer.getErr()); |
| |
| return *tok; |
| } |
| |
| bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) { |
| // Create the initial section, if requested. |
| if (!NoInitialTextSection) |
| Out.InitSections(); |
| |
| // Prime the lexer. |
| Lex(); |
| |
| HadError = false; |
| AsmCond StartingCondState = TheCondState; |
| |
| // If we are generating dwarf for assembly source files save the initial text |
| // section and generate a .file directive. |
| if (getContext().getGenDwarfForAssembly()) { |
| getContext().setGenDwarfSection(getStreamer().getCurrentSection()); |
| MCSymbol *SectionStartSym = getContext().CreateTempSymbol(); |
| getStreamer().EmitLabel(SectionStartSym); |
| getContext().setGenDwarfSectionStartSym(SectionStartSym); |
| getStreamer().EmitDwarfFileDirective(getContext().nextGenDwarfFileNumber(), |
| StringRef(), SrcMgr.getMemoryBuffer(CurBuffer)->getBufferIdentifier()); |
| } |
| |
| // While we have input, parse each statement. |
| while (Lexer.isNot(AsmToken::Eof)) { |
| if (!ParseStatement()) continue; |
| |
| // We had an error, validate that one was emitted and recover by skipping to |
| // the next line. |
| assert(HadError && "Parse statement returned an error, but none emitted!"); |
| EatToEndOfStatement(); |
| } |
| |
| if (TheCondState.TheCond != StartingCondState.TheCond || |
| TheCondState.Ignore != StartingCondState.Ignore) |
| return TokError("unmatched .ifs or .elses"); |
| |
| // Check to see there are no empty DwarfFile slots. |
| const std::vector<MCDwarfFile *> &MCDwarfFiles = |
| getContext().getMCDwarfFiles(); |
| for (unsigned i = 1; i < MCDwarfFiles.size(); i++) { |
| if (!MCDwarfFiles[i]) |
| TokError("unassigned file number: " + Twine(i) + " for .file directives"); |
| } |
| |
| // Check to see that all assembler local symbols were actually defined. |
| // Targets that don't do subsections via symbols may not want this, though, |
| // so conservatively exclude them. Only do this if we're finalizing, though, |
| // as otherwise we won't necessarilly have seen everything yet. |
| if (!NoFinalize && MAI.hasSubsectionsViaSymbols()) { |
| const MCContext::SymbolTable &Symbols = getContext().getSymbols(); |
| for (MCContext::SymbolTable::const_iterator i = Symbols.begin(), |
| e = Symbols.end(); |
| i != e; ++i) { |
| MCSymbol *Sym = i->getValue(); |
| // Variable symbols may not be marked as defined, so check those |
| // explicitly. If we know it's a variable, we have a definition for |
| // the purposes of this check. |
| if (Sym->isTemporary() && !Sym->isVariable() && !Sym->isDefined()) |
| // FIXME: We would really like to refer back to where the symbol was |
| // first referenced for a source location. We need to add something |
| // to track that. Currently, we just point to the end of the file. |
| PrintMessage(getLexer().getLoc(), SourceMgr::DK_Error, |
| "assembler local symbol '" + Sym->getName() + |
| "' not defined"); |
| } |
| } |
| |
| |
| // Finalize the output stream if there are no errors and if the client wants |
| // us to. |
| if (!HadError && !NoFinalize) |
| Out.Finish(); |
| |
| return HadError; |
| } |
| |
| void AsmParser::CheckForValidSection() { |
| if (!getStreamer().getCurrentSection()) { |
| TokError("expected section directive before assembly directive"); |
| Out.SwitchSection(Ctx.getMachOSection( |
| "__TEXT", "__text", |
| MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, |
| 0, SectionKind::getText())); |
| } |
| } |
| |
| /// EatToEndOfStatement - Throw away the rest of the line for testing purposes. |
| void AsmParser::EatToEndOfStatement() { |
| while (Lexer.isNot(AsmToken::EndOfStatement) && |
| Lexer.isNot(AsmToken::Eof)) |
| Lex(); |
| |
| // Eat EOL. |
| if (Lexer.is(AsmToken::EndOfStatement)) |
| Lex(); |
| } |
| |
| StringRef AsmParser::ParseStringToEndOfStatement() { |
| const char *Start = getTok().getLoc().getPointer(); |
| |
| while (Lexer.isNot(AsmToken::EndOfStatement) && |
| Lexer.isNot(AsmToken::Eof)) |
| Lex(); |
| |
| const char *End = getTok().getLoc().getPointer(); |
| return StringRef(Start, End - Start); |
| } |
| |
| /// ParseParenExpr - Parse a paren expression and return it. |
| /// NOTE: This assumes the leading '(' has already been consumed. |
| /// |
| /// parenexpr ::= expr) |
| /// |
| bool AsmParser::ParseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) { |
| if (ParseExpression(Res)) return true; |
| if (Lexer.isNot(AsmToken::RParen)) |
| return TokError("expected ')' in parentheses expression"); |
| EndLoc = Lexer.getLoc(); |
| Lex(); |
| return false; |
| } |
| |
| /// ParseBracketExpr - Parse a bracket expression and return it. |
| /// NOTE: This assumes the leading '[' has already been consumed. |
| /// |
| /// bracketexpr ::= expr] |
| /// |
| bool AsmParser::ParseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc) { |
| if (ParseExpression(Res)) return true; |
| if (Lexer.isNot(AsmToken::RBrac)) |
| return TokError("expected ']' in brackets expression"); |
| EndLoc = Lexer.getLoc(); |
| Lex(); |
| return false; |
| } |
| |
| /// ParsePrimaryExpr - Parse a primary expression and return it. |
| /// primaryexpr ::= (parenexpr |
| /// primaryexpr ::= symbol |
| /// primaryexpr ::= number |
| /// primaryexpr ::= '.' |
| /// primaryexpr ::= ~,+,- primaryexpr |
| bool AsmParser::ParsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) { |
| switch (Lexer.getKind()) { |
| default: |
| return TokError("unknown token in expression"); |
| // If we have an error assume that we've already handled it. |
| case AsmToken::Error: |
| return true; |
| case AsmToken::Exclaim: |
| Lex(); // Eat the operator. |
| if (ParsePrimaryExpr(Res, EndLoc)) |
| return true; |
| Res = MCUnaryExpr::CreateLNot(Res, getContext()); |
| return false; |
| case AsmToken::Dollar: |
| case AsmToken::String: |
| case AsmToken::Identifier: { |
| EndLoc = Lexer.getLoc(); |
| |
| StringRef Identifier; |
| if (ParseIdentifier(Identifier)) |
| return true; |
| |
| // This is a symbol reference. |
| std::pair<StringRef, StringRef> Split = Identifier.split('@'); |
| MCSymbol *Sym = getContext().GetOrCreateSymbol(Split.first); |
| |
| // Lookup the symbol variant if used. |
| MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None; |
| if (Split.first.size() != Identifier.size()) { |
| Variant = MCSymbolRefExpr::getVariantKindForName(Split.second); |
| if (Variant == MCSymbolRefExpr::VK_Invalid) { |
| Variant = MCSymbolRefExpr::VK_None; |
| return TokError("invalid variant '" + Split.second + "'"); |
| } |
| } |
| |
| // If this is an absolute variable reference, substitute it now to preserve |
| // semantics in the face of reassignment. |
| if (Sym->isVariable() && isa<MCConstantExpr>(Sym->getVariableValue())) { |
| if (Variant) |
| return Error(EndLoc, "unexpected modifier on variable reference"); |
| |
| Res = Sym->getVariableValue(); |
| return false; |
| } |
| |
| // Otherwise create a symbol ref. |
| Res = MCSymbolRefExpr::Create(Sym, Variant, getContext()); |
| return false; |
| } |
| case AsmToken::Integer: { |
| SMLoc Loc = getTok().getLoc(); |
| int64_t IntVal = getTok().getIntVal(); |
| Res = MCConstantExpr::Create(IntVal, getContext()); |
| EndLoc = Lexer.getLoc(); |
| Lex(); // Eat token. |
| // Look for 'b' or 'f' following an Integer as a directional label |
| if (Lexer.getKind() == AsmToken::Identifier) { |
| StringRef IDVal = getTok().getString(); |
| if (IDVal == "f" || IDVal == "b"){ |
| MCSymbol *Sym = Ctx.GetDirectionalLocalSymbol(IntVal, |
| IDVal == "f" ? 1 : 0); |
| Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None, |
| getContext()); |
| if(IDVal == "b" && Sym->isUndefined()) |
| return Error(Loc, "invalid reference to undefined symbol"); |
| EndLoc = Lexer.getLoc(); |
| Lex(); // Eat identifier. |
| } |
| } |
| return false; |
| } |
| case AsmToken::Real: { |
| APFloat RealVal(APFloat::IEEEdouble, getTok().getString()); |
| uint64_t IntVal = RealVal.bitcastToAPInt().getZExtValue(); |
| Res = MCConstantExpr::Create(IntVal, getContext()); |
| Lex(); // Eat token. |
| return false; |
| } |
| case AsmToken::Dot: { |
| // This is a '.' reference, which references the current PC. Emit a |
| // temporary label to the streamer and refer to it. |
| MCSymbol *Sym = Ctx.CreateTempSymbol(); |
| Out.EmitLabel(Sym); |
| Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_None, getContext()); |
| EndLoc = Lexer.getLoc(); |
| Lex(); // Eat identifier. |
| return false; |
| } |
| case AsmToken::LParen: |
| Lex(); // Eat the '('. |
| return ParseParenExpr(Res, EndLoc); |
| case AsmToken::LBrac: |
| if (!PlatformParser->HasBracketExpressions()) |
| return TokError("brackets expression not supported on this target"); |
| Lex(); // Eat the '['. |
| return ParseBracketExpr(Res, EndLoc); |
| case AsmToken::Minus: |
| Lex(); // Eat the operator. |
| if (ParsePrimaryExpr(Res, EndLoc)) |
| return true; |
| Res = MCUnaryExpr::CreateMinus(Res, getContext()); |
| return false; |
| case AsmToken::Plus: |
| Lex(); // Eat the operator. |
| if (ParsePrimaryExpr(Res, EndLoc)) |
| return true; |
| Res = MCUnaryExpr::CreatePlus(Res, getContext()); |
| return false; |
| case AsmToken::Tilde: |
| Lex(); // Eat the operator. |
| if (ParsePrimaryExpr(Res, EndLoc)) |
| return true; |
| Res = MCUnaryExpr::CreateNot(Res, getContext()); |
| return false; |
| } |
| } |
| |
| bool AsmParser::ParseExpression(const MCExpr *&Res) { |
| SMLoc EndLoc; |
| return ParseExpression(Res, EndLoc); |
| } |
| |
| const MCExpr * |
| AsmParser::ApplyModifierToExpr(const MCExpr *E, |
| MCSymbolRefExpr::VariantKind Variant) { |
| // Recurse over the given expression, rebuilding it to apply the given variant |
| // if there is exactly one symbol. |
| switch (E->getKind()) { |
| case MCExpr::Target: |
| case MCExpr::Constant: |
| return 0; |
| |
| case MCExpr::SymbolRef: { |
| const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(E); |
| |
| if (SRE->getKind() != MCSymbolRefExpr::VK_None) { |
| TokError("invalid variant on expression '" + |
| getTok().getIdentifier() + "' (already modified)"); |
| return E; |
| } |
| |
| return MCSymbolRefExpr::Create(&SRE->getSymbol(), Variant, getContext()); |
| } |
| |
| case MCExpr::Unary: { |
| const MCUnaryExpr *UE = cast<MCUnaryExpr>(E); |
| const MCExpr *Sub = ApplyModifierToExpr(UE->getSubExpr(), Variant); |
| if (!Sub) |
| return 0; |
| return MCUnaryExpr::Create(UE->getOpcode(), Sub, getContext()); |
| } |
| |
| case MCExpr::Binary: { |
| const MCBinaryExpr *BE = cast<MCBinaryExpr>(E); |
| const MCExpr *LHS = ApplyModifierToExpr(BE->getLHS(), Variant); |
| const MCExpr *RHS = ApplyModifierToExpr(BE->getRHS(), Variant); |
| |
| if (!LHS && !RHS) |
| return 0; |
| |
| if (!LHS) LHS = BE->getLHS(); |
| if (!RHS) RHS = BE->getRHS(); |
| |
| return MCBinaryExpr::Create(BE->getOpcode(), LHS, RHS, getContext()); |
| } |
| } |
| |
| assert(0 && "Invalid expression kind!"); |
| return 0; |
| } |
| |
| /// ParseExpression - Parse an expression and return it. |
| /// |
| /// expr ::= expr &&,|| expr -> lowest. |
| /// expr ::= expr |,^,&,! expr |
| /// expr ::= expr ==,!=,<>,<,<=,>,>= expr |
| /// expr ::= expr <<,>> expr |
| /// expr ::= expr +,- expr |
| /// expr ::= expr *,/,% expr -> highest. |
| /// expr ::= primaryexpr |
| /// |
| bool AsmParser::ParseExpression(const MCExpr *&Res, SMLoc &EndLoc) { |
| // Parse the expression. |
| Res = 0; |
| if (ParsePrimaryExpr(Res, EndLoc) || ParseBinOpRHS(1, Res, EndLoc)) |
| return true; |
| |
| // As a special case, we support 'a op b @ modifier' by rewriting the |
| // expression to include the modifier. This is inefficient, but in general we |
| // expect users to use 'a@modifier op b'. |
| if (Lexer.getKind() == AsmToken::At) { |
| Lex(); |
| |
| if (Lexer.isNot(AsmToken::Identifier)) |
| return TokError("unexpected symbol modifier following '@'"); |
| |
| MCSymbolRefExpr::VariantKind Variant = |
| MCSymbolRefExpr::getVariantKindForName(getTok().getIdentifier()); |
| if (Variant == MCSymbolRefExpr::VK_Invalid) |
| return TokError("invalid variant '" + getTok().getIdentifier() + "'"); |
| |
| const MCExpr *ModifiedRes = ApplyModifierToExpr(Res, Variant); |
| if (!ModifiedRes) { |
| return TokError("invalid modifier '" + getTok().getIdentifier() + |
| "' (no symbols present)"); |
| return true; |
| } |
| |
| Res = ModifiedRes; |
| Lex(); |
| } |
| |
| // Try to constant fold it up front, if possible. |
| int64_t Value; |
| if (Res->EvaluateAsAbsolute(Value)) |
| Res = MCConstantExpr::Create(Value, getContext()); |
| |
| return false; |
| } |
| |
| bool AsmParser::ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) { |
| Res = 0; |
| return ParseParenExpr(Res, EndLoc) || |
| ParseBinOpRHS(1, Res, EndLoc); |
| } |
| |
| bool AsmParser::ParseAbsoluteExpression(int64_t &Res) { |
| const MCExpr *Expr; |
| |
| SMLoc StartLoc = Lexer.getLoc(); |
| if (ParseExpression(Expr)) |
| return true; |
| |
| if (!Expr->EvaluateAsAbsolute(Res)) |
| return Error(StartLoc, "expected absolute expression"); |
| |
| return false; |
| } |
| |
| static unsigned getBinOpPrecedence(AsmToken::TokenKind K, |
| MCBinaryExpr::Opcode &Kind) { |
| switch (K) { |
| default: |
| return 0; // not a binop. |
| |
| // Lowest Precedence: &&, || |
| case AsmToken::AmpAmp: |
| Kind = MCBinaryExpr::LAnd; |
| return 1; |
| case AsmToken::PipePipe: |
| Kind = MCBinaryExpr::LOr; |
| return 1; |
| |
| |
| // Low Precedence: |, &, ^ |
| // |
| // FIXME: gas seems to support '!' as an infix operator? |
| case AsmToken::Pipe: |
| Kind = MCBinaryExpr::Or; |
| return 2; |
| case AsmToken::Caret: |
| Kind = MCBinaryExpr::Xor; |
| return 2; |
| case AsmToken::Amp: |
| Kind = MCBinaryExpr::And; |
| return 2; |
| |
| // Low Intermediate Precedence: ==, !=, <>, <, <=, >, >= |
| case AsmToken::EqualEqual: |
| Kind = MCBinaryExpr::EQ; |
| return 3; |
| case AsmToken::ExclaimEqual: |
| case AsmToken::LessGreater: |
| Kind = MCBinaryExpr::NE; |
| return 3; |
| case AsmToken::Less: |
| Kind = MCBinaryExpr::LT; |
| return 3; |
| case AsmToken::LessEqual: |
| Kind = MCBinaryExpr::LTE; |
| return 3; |
| case AsmToken::Greater: |
| Kind = MCBinaryExpr::GT; |
| return 3; |
| case AsmToken::GreaterEqual: |
| Kind = MCBinaryExpr::GTE; |
| return 3; |
| |
| // Intermediate Precedence: <<, >> |
| case AsmToken::LessLess: |
| Kind = MCBinaryExpr::Shl; |
| return 4; |
| case AsmToken::GreaterGreater: |
| Kind = MCBinaryExpr::Shr; |
| return 4; |
| |
| // High Intermediate Precedence: +, - |
| case AsmToken::Plus: |
| Kind = MCBinaryExpr::Add; |
| return 5; |
| case AsmToken::Minus: |
| Kind = MCBinaryExpr::Sub; |
| return 5; |
| |
| // Highest Precedence: *, /, % |
| case AsmToken::Star: |
| Kind = MCBinaryExpr::Mul; |
| return 6; |
| case AsmToken::Slash: |
| Kind = MCBinaryExpr::Div; |
| return 6; |
| case AsmToken::Percent: |
| Kind = MCBinaryExpr::Mod; |
| return 6; |
| } |
| } |
| |
| |
| /// ParseBinOpRHS - Parse all binary operators with precedence >= 'Precedence'. |
| /// Res contains the LHS of the expression on input. |
| bool AsmParser::ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res, |
| SMLoc &EndLoc) { |
| while (1) { |
| MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add; |
| unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind); |
| |
| // If the next token is lower precedence than we are allowed to eat, return |
| // successfully with what we ate already. |
| if (TokPrec < Precedence) |
| return false; |
| |
| Lex(); |
| |
| // Eat the next primary expression. |
| const MCExpr *RHS; |
| if (ParsePrimaryExpr(RHS, EndLoc)) return true; |
| |
| // If BinOp binds less tightly with RHS than the operator after RHS, let |
| // the pending operator take RHS as its LHS. |
| MCBinaryExpr::Opcode Dummy; |
| unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy); |
| if (TokPrec < NextTokPrec) { |
| if (ParseBinOpRHS(Precedence+1, RHS, EndLoc)) return true; |
| } |
| |
| // Merge LHS and RHS according to operator. |
| Res = MCBinaryExpr::Create(Kind, Res, RHS, getContext()); |
| } |
| } |
| |
| |
| |
| |
| /// ParseStatement: |
| /// ::= EndOfStatement |
| /// ::= Label* Directive ...Operands... EndOfStatement |
| /// ::= Label* Identifier OperandList* EndOfStatement |
| bool AsmParser::ParseStatement() { |
| if (Lexer.is(AsmToken::EndOfStatement)) { |
| Out.AddBlankLine(); |
| Lex(); |
| return false; |
| } |
| |
| // Statements always start with an identifier or are a full line comment. |
| AsmToken ID = getTok(); |
| SMLoc IDLoc = ID.getLoc(); |
| StringRef IDVal; |
| int64_t LocalLabelVal = -1; |
| // A full line comment is a '#' as the first token. |
| if (Lexer.is(AsmToken::Hash)) |
| return ParseCppHashLineFilenameComment(IDLoc); |
| |
| // Allow an integer followed by a ':' as a directional local label. |
| if (Lexer.is(AsmToken::Integer)) { |
| LocalLabelVal = getTok().getIntVal(); |
| if (LocalLabelVal < 0) { |
| if (!TheCondState.Ignore) |
| return TokError("unexpected token at start of statement"); |
| IDVal = ""; |
| } |
| else { |
| IDVal = getTok().getString(); |
| Lex(); // Consume the integer token to be used as an identifier token. |
| if (Lexer.getKind() != AsmToken::Colon) { |
| if (!TheCondState.Ignore) |
| return TokError("unexpected token at start of statement"); |
| } |
| } |
| |
| } else if (Lexer.is(AsmToken::Dot)) { |
| // Treat '.' as a valid identifier in this context. |
| Lex(); |
| IDVal = "."; |
| |
| } else if (ParseIdentifier(IDVal)) { |
| if (!TheCondState.Ignore) |
| return TokError("unexpected token at start of statement"); |
| IDVal = ""; |
| } |
| |
| |
| // Handle conditional assembly here before checking for skipping. We |
| // have to do this so that .endif isn't skipped in a ".if 0" block for |
| // example. |
| if (IDVal == ".if") |
| return ParseDirectiveIf(IDLoc); |
| if (IDVal == ".ifdef") |
| return ParseDirectiveIfdef(IDLoc, true); |
| if (IDVal == ".ifndef" || IDVal == ".ifnotdef") |
| return ParseDirectiveIfdef(IDLoc, false); |
| if (IDVal == ".elseif") |
| return ParseDirectiveElseIf(IDLoc); |
| if (IDVal == ".else") |
| return ParseDirectiveElse(IDLoc); |
| if (IDVal == ".endif") |
| return ParseDirectiveEndIf(IDLoc); |
| |
| // If we are in a ".if 0" block, ignore this statement. |
| if (TheCondState.Ignore) { |
| EatToEndOfStatement(); |
| return false; |
| } |
| |
| // FIXME: Recurse on local labels? |
| |
| // See what kind of statement we have. |
| switch (Lexer.getKind()) { |
| case AsmToken::Colon: { |
| CheckForValidSection(); |
| |
| // identifier ':' -> Label. |
| Lex(); |
| |
| // Diagnose attempt to use '.' as a label. |
| if (IDVal == ".") |
| return Error(IDLoc, "invalid use of pseudo-symbol '.' as a label"); |
| |
| // Diagnose attempt to use a variable as a label. |
| // |
| // FIXME: Diagnostics. Note the location of the definition as a label. |
| // FIXME: This doesn't diagnose assignment to a symbol which has been |
| // implicitly marked as external. |
| MCSymbol *Sym; |
| if (LocalLabelVal == -1) |
| Sym = getContext().GetOrCreateSymbol(IDVal); |
| else |
| Sym = Ctx.CreateDirectionalLocalSymbol(LocalLabelVal); |
| if (!Sym->isUndefined() || Sym->isVariable()) |
| return Error(IDLoc, "invalid symbol redefinition"); |
| |
| // Emit the label. |
| Out.EmitLabel(Sym); |
| |
| // If we are generating dwarf for assembly source files then gather the |
| // info to make a dwarf subprogram entry for this label if needed. |
| if (getContext().getGenDwarfForAssembly()) |
| MCGenDwarfSubprogramEntry::Make(Sym, &getStreamer(), getSourceManager(), |
| IDLoc); |
| |
| // Consume any end of statement token, if present, to avoid spurious |
| // AddBlankLine calls(). |
| if (Lexer.is(AsmToken::EndOfStatement)) { |
| Lex(); |
| if (Lexer.is(AsmToken::Eof)) |
| return false; |
| } |
| |
| return ParseStatement(); |
| } |
| |
| case AsmToken::Equal: |
| // identifier '=' ... -> assignment statement |
| Lex(); |
| |
| return ParseAssignment(IDVal, true); |
| |
| default: // Normal instruction or directive. |
| break; |
| } |
| |
| // If macros are enabled, check to see if this is a macro instantiation. |
| if (MacrosEnabled) |
| if (const Macro *M = MacroMap.lookup(IDVal)) |
| return HandleMacroEntry(IDVal, IDLoc, M); |
| |
| // Otherwise, we have a normal instruction or directive. |
| if (IDVal[0] == '.' && IDVal != ".") { |
| // Assembler features |
| if (IDVal == ".set" || IDVal == ".equ") |
| return ParseDirectiveSet(IDVal, true); |
| if (IDVal == ".equiv") |
| return ParseDirectiveSet(IDVal, false); |
| |
| // Data directives |
| |
| if (IDVal == ".ascii") |
| return ParseDirectiveAscii(IDVal, false); |
| if (IDVal == ".asciz" || IDVal == ".string") |
| return ParseDirectiveAscii(IDVal, true); |
| |
| if (IDVal == ".byte") |
| return ParseDirectiveValue(1); |
| if (IDVal == ".short") |
| return ParseDirectiveValue(2); |
| if (IDVal == ".value") |
| return ParseDirectiveValue(2); |
| if (IDVal == ".2byte") |
| return ParseDirectiveValue(2); |
| if (IDVal == ".long") |
| return ParseDirectiveValue(4); |
| if (IDVal == ".int") |
| return ParseDirectiveValue(4); |
| if (IDVal == ".4byte") |
| return ParseDirectiveValue(4); |
| if (IDVal == ".quad") |
| return ParseDirectiveValue(8); |
| if (IDVal == ".8byte") |
| return ParseDirectiveValue(8); |
| if (IDVal == ".single" || IDVal == ".float") |
| return ParseDirectiveRealValue(APFloat::IEEEsingle); |
| if (IDVal == ".double") |
| return ParseDirectiveRealValue(APFloat::IEEEdouble); |
| |
| if (IDVal == ".align") { |
| bool IsPow2 = !getContext().getAsmInfo().getAlignmentIsInBytes(); |
| return ParseDirectiveAlign(IsPow2, /*ExprSize=*/1); |
| } |
| if (IDVal == ".align32") { |
| bool IsPow2 = !getContext().getAsmInfo().getAlignmentIsInBytes(); |
| return ParseDirectiveAlign(IsPow2, /*ExprSize=*/4); |
| } |
| if (IDVal == ".balign") |
| return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1); |
| if (IDVal == ".balignw") |
| return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2); |
| if (IDVal == ".balignl") |
| return ParseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4); |
| if (IDVal == ".p2align") |
| return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1); |
| if (IDVal == ".p2alignw") |
| return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2); |
| if (IDVal == ".p2alignl") |
| return ParseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4); |
| |
| if (IDVal == ".org") |
| return ParseDirectiveOrg(); |
| |
| if (IDVal == ".fill") |
| return ParseDirectiveFill(); |
| if (IDVal == ".space" || IDVal == ".skip") |
| return ParseDirectiveSpace(); |
| if (IDVal == ".zero") |
| return ParseDirectiveZero(); |
| |
| // Symbol attribute directives |
| |
| if (IDVal == ".globl" || IDVal == ".global") |
| return ParseDirectiveSymbolAttribute(MCSA_Global); |
| if (IDVal == ".indirect_symbol") |
| return ParseDirectiveSymbolAttribute(MCSA_IndirectSymbol); |
| if (IDVal == ".lazy_reference") |
| return ParseDirectiveSymbolAttribute(MCSA_LazyReference); |
| if (IDVal == ".no_dead_strip") |
| return ParseDirectiveSymbolAttribute(MCSA_NoDeadStrip); |
| if (IDVal == ".symbol_resolver") |
| return ParseDirectiveSymbolAttribute(MCSA_SymbolResolver); |
| if (IDVal == ".private_extern") |
| return ParseDirectiveSymbolAttribute(MCSA_PrivateExtern); |
| if (IDVal == ".reference") |
| return ParseDirectiveSymbolAttribute(MCSA_Reference); |
| if (IDVal == ".weak_definition") |
| return ParseDirectiveSymbolAttribute(MCSA_WeakDefinition); |
| if (IDVal == ".weak_reference") |
| return ParseDirectiveSymbolAttribute(MCSA_WeakReference); |
| if (IDVal == ".weak_def_can_be_hidden") |
| return ParseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate); |
| |
| if (IDVal == ".comm" || IDVal == ".common") |
| return ParseDirectiveComm(/*IsLocal=*/false); |
| if (IDVal == ".lcomm") |
| return ParseDirectiveComm(/*IsLocal=*/true); |
| |
| if (IDVal == ".abort") |
| return ParseDirectiveAbort(); |
| if (IDVal == ".include") |
| return ParseDirectiveInclude(); |
| if (IDVal == ".incbin") |
| return ParseDirectiveIncbin(); |
| |
| if (IDVal == ".code16") |
| return TokError(Twine(IDVal) + " not supported yet"); |
| |
| // Look up the handler in the handler table. |
| std::pair<MCAsmParserExtension*, DirectiveHandler> Handler = |
| DirectiveMap.lookup(IDVal); |
| if (Handler.first) |
| return (*Handler.second)(Handler.first, IDVal, IDLoc); |
| |
| // Target hook for parsing target specific directives. |
| if (!getTargetParser().ParseDirective(ID)) |
| return false; |
| |
| bool retval = Warning(IDLoc, "ignoring directive for now"); |
| EatToEndOfStatement(); |
| return retval; |
| } |
| |
| CheckForValidSection(); |
| |
| // 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])); |
| |
| SmallVector<MCParsedAsmOperand*, 8> ParsedOperands; |
| bool HadError = getTargetParser().ParseInstruction(Opcode.str(), IDLoc, |
| ParsedOperands); |
| |
| // Dump the parsed representation, if requested. |
| if (getShowParsedOperands()) { |
| SmallString<256> Str; |
| raw_svector_ostream OS(Str); |
| OS << "parsed instruction: ["; |
| for (unsigned i = 0; i != ParsedOperands.size(); ++i) { |
| if (i != 0) |
| OS << ", "; |
| ParsedOperands[i]->print(OS); |
| } |
| OS << "]"; |
| |
| PrintMessage(IDLoc, SourceMgr::DK_Note, OS.str()); |
| } |
| |
| // If we are generating dwarf for assembly source files and the current |
| // section is the initial text section then generate a .loc directive for |
| // the instruction. |
| if (!HadError && getContext().getGenDwarfForAssembly() && |
| getContext().getGenDwarfSection() == getStreamer().getCurrentSection() ) { |
| getStreamer().EmitDwarfLocDirective(getContext().getGenDwarfFileNumber(), |
| SrcMgr.FindLineNumber(IDLoc, CurBuffer), |
| 0, DWARF2_LINE_DEFAULT_IS_STMT ? |
| DWARF2_FLAG_IS_STMT : 0, 0, 0, |
| StringRef()); |
| } |
| |
| // If parsing succeeded, match the instruction. |
| if (!HadError) |
| HadError = getTargetParser().MatchAndEmitInstruction(IDLoc, ParsedOperands, |
| Out); |
| |
| // Free any parsed operands. |
| for (unsigned i = 0, e = ParsedOperands.size(); i != e; ++i) |
| delete ParsedOperands[i]; |
| |
| // Don't skip the rest of the line, the instruction parser is responsible for |
| // that. |
| return false; |
| } |
| |
| /// EatToEndOfLine uses the Lexer to eat the characters to the end of the line |
| /// since they may not be able to be tokenized to get to the end of line token. |
| void AsmParser::EatToEndOfLine() { |
| if (!Lexer.is(AsmToken::EndOfStatement)) |
| Lexer.LexUntilEndOfLine(); |
| // Eat EOL. |
| Lex(); |
| } |
| |
| /// ParseCppHashLineFilenameComment as this: |
| /// ::= # number "filename" |
| /// or just as a full line comment if it doesn't have a number and a string. |
| bool AsmParser::ParseCppHashLineFilenameComment(const SMLoc &L) { |
| Lex(); // Eat the hash token. |
| |
| if (getLexer().isNot(AsmToken::Integer)) { |
| // Consume the line since in cases it is not a well-formed line directive, |
| // as if were simply a full line comment. |
| EatToEndOfLine(); |
| return false; |
| } |
| |
| int64_t LineNumber = getTok().getIntVal(); |
| Lex(); |
| |
| if (getLexer().isNot(AsmToken::String)) { |
| EatToEndOfLine(); |
| return false; |
| } |
| |
| StringRef Filename = getTok().getString(); |
| // Get rid of the enclosing quotes. |
| Filename = Filename.substr(1, Filename.size()-2); |
| |
| // Save the SMLoc, Filename and LineNumber for later use by diagnostics. |
| CppHashLoc = L; |
| CppHashFilename = Filename; |
| CppHashLineNumber = LineNumber; |
| |
| // Ignore any trailing characters, they're just comment. |
| EatToEndOfLine(); |
| return false; |
| } |
| |
| /// DiagHandler - will use the the last parsed cpp hash line filename comment |
| /// for the Filename and LineNo if any in the diagnostic. |
| void AsmParser::DiagHandler(const SMDiagnostic &Diag, void *Context) { |
| const AsmParser *Parser = static_cast<const AsmParser*>(Context); |
| raw_ostream &OS = errs(); |
| |
| const SourceMgr &DiagSrcMgr = *Diag.getSourceMgr(); |
| const SMLoc &DiagLoc = Diag.getLoc(); |
| int DiagBuf = DiagSrcMgr.FindBufferContainingLoc(DiagLoc); |
| int CppHashBuf = Parser->SrcMgr.FindBufferContainingLoc(Parser->CppHashLoc); |
| |
| // Like SourceMgr::PrintMessage() we need to print the include stack if any |
| // before printing the message. |
| int DiagCurBuffer = DiagSrcMgr.FindBufferContainingLoc(DiagLoc); |
| if (!Parser->SavedDiagHandler && DiagCurBuffer > 0) { |
| SMLoc ParentIncludeLoc = DiagSrcMgr.getParentIncludeLoc(DiagCurBuffer); |
| DiagSrcMgr.PrintIncludeStack(ParentIncludeLoc, OS); |
| } |
| |
| // If we have not parsed a cpp hash line filename comment or the source |
| // manager changed or buffer changed (like in a nested include) then just |
| // print the normal diagnostic using its Filename and LineNo. |
| if (!Parser->CppHashLineNumber || |
| &DiagSrcMgr != &Parser->SrcMgr || |
| DiagBuf != CppHashBuf) { |
| if (Parser->SavedDiagHandler) |
| Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext); |
| else |
| Diag.print(0, OS); |
| return; |
| } |
| |
| // Use the CppHashFilename and calculate a line number based on the |
| // CppHashLoc and CppHashLineNumber relative to this Diag's SMLoc for |
| // the diagnostic. |
| const std::string Filename = Parser->CppHashFilename; |
| |
| int DiagLocLineNo = DiagSrcMgr.FindLineNumber(DiagLoc, DiagBuf); |
| int CppHashLocLineNo = |
| Parser->SrcMgr.FindLineNumber(Parser->CppHashLoc, CppHashBuf); |
| int LineNo = Parser->CppHashLineNumber - 1 + |
| (DiagLocLineNo - CppHashLocLineNo); |
| |
| SMDiagnostic NewDiag(*Diag.getSourceMgr(), Diag.getLoc(), |
| Filename, LineNo, Diag.getColumnNo(), |
| Diag.getKind(), Diag.getMessage(), |
| Diag.getLineContents(), Diag.getRanges()); |
| |
| if (Parser->SavedDiagHandler) |
| Parser->SavedDiagHandler(NewDiag, Parser->SavedDiagContext); |
| else |
| NewDiag.print(0, OS); |
| } |
| |
| bool AsmParser::expandMacro(SmallString<256> &Buf, StringRef Body, |
| const std::vector<StringRef> &Parameters, |
| const std::vector<std::vector<AsmToken> > &A, |
| const SMLoc &L) { |
| raw_svector_ostream OS(Buf); |
| unsigned NParameters = Parameters.size(); |
| if (NParameters != 0 && NParameters != A.size()) |
| return Error(L, "Wrong number of arguments"); |
| |
| while (!Body.empty()) { |
| // Scan for the next substitution. |
| std::size_t End = Body.size(), Pos = 0; |
| for (; Pos != End; ++Pos) { |
| // Check for a substitution or escape. |
| if (!NParameters) { |
| // This macro has no parameters, look for $0, $1, etc. |
| if (Body[Pos] != '$' || Pos + 1 == End) |
| continue; |
| |
| char Next = Body[Pos + 1]; |
| if (Next == '$' || Next == 'n' || isdigit(Next)) |
| break; |
| } else { |
| // This macro has parameters, look for \foo, \bar, etc. |
| if (Body[Pos] == '\\' && Pos + 1 != End) |
| break; |
| } |
| } |
| |
| // Add the prefix. |
| OS << Body.slice(0, Pos); |
| |
| // Check if we reached the end. |
| if (Pos == End) |
| break; |
| |
| if (!NParameters) { |
| switch (Body[Pos+1]) { |
| // $$ => $ |
| case '$': |
| OS << '$'; |
| break; |
| |
| // $n => number of arguments |
| case 'n': |
| OS << A.size(); |
| break; |
| |
| // $[0-9] => argument |
| default: { |
| // Missing arguments are ignored. |
| unsigned Index = Body[Pos+1] - '0'; |
| if (Index >= A.size()) |
| break; |
| |
| // Otherwise substitute with the token values, with spaces eliminated. |
| for (std::vector<AsmToken>::const_iterator it = A[Index].begin(), |
| ie = A[Index].end(); it != ie; ++it) |
| OS << it->getString(); |
| break; |
| } |
| } |
| Pos += 2; |
| } else { |
| unsigned I = Pos + 1; |
| while (isalnum(Body[I]) && I + 1 != End) |
| ++I; |
| |
| const char *Begin = Body.data() + Pos +1; |
| StringRef Argument(Begin, I - (Pos +1)); |
| unsigned Index = 0; |
| for (; Index < NParameters; ++Index) |
| if (Parameters[Index] == Argument) |
| break; |
| |
| // FIXME: We should error at the macro definition. |
| if (Index == NParameters) |
| return Error(L, "Parameter not found"); |
| |
| for (std::vector<AsmToken>::const_iterator it = A[Index].begin(), |
| ie = A[Index].end(); it != ie; ++it) |
| OS << it->getString(); |
| |
| Pos += 1 + Argument.size(); |
| } |
| // Update the scan point. |
| Body = Body.substr(Pos); |
| } |
| |
| // We include the .endmacro in the buffer as our queue to exit the macro |
| // instantiation. |
| OS << ".endmacro\n"; |
| return false; |
| } |
| |
| MacroInstantiation::MacroInstantiation(const Macro *M, SMLoc IL, SMLoc EL, |
| MemoryBuffer *I) |
| : TheMacro(M), Instantiation(I), InstantiationLoc(IL), ExitLoc(EL) |
| { |
| } |
| |
| bool AsmParser::HandleMacroEntry(StringRef Name, SMLoc NameLoc, |
| const Macro *M) { |
| // Arbitrarily limit macro nesting depth, to match 'as'. We can eliminate |
| // this, although we should protect against infinite loops. |
| if (ActiveMacros.size() == 20) |
| return TokError("macros cannot be nested more than 20 levels deep"); |
| |
| // Parse the macro instantiation arguments. |
| std::vector<std::vector<AsmToken> > MacroArguments; |
| MacroArguments.push_back(std::vector<AsmToken>()); |
| unsigned ParenLevel = 0; |
| for (;;) { |
| if (Lexer.is(AsmToken::Eof)) |
| return TokError("unexpected token in macro instantiation"); |
| if (Lexer.is(AsmToken::EndOfStatement)) |
| break; |
| |
| // If we aren't inside parentheses and this is a comma, start a new token |
| // list. |
| if (ParenLevel == 0 && Lexer.is(AsmToken::Comma)) { |
| MacroArguments.push_back(std::vector<AsmToken>()); |
| } else { |
| // Adjust the current parentheses level. |
| if (Lexer.is(AsmToken::LParen)) |
| ++ParenLevel; |
| else if (Lexer.is(AsmToken::RParen) && ParenLevel) |
| --ParenLevel; |
| |
| // Append the token to the current argument list. |
| MacroArguments.back().push_back(getTok()); |
| } |
| Lex(); |
| } |
| |
| // Macro instantiation is lexical, unfortunately. We construct a new buffer |
| // to hold the macro body with substitutions. |
| SmallString<256> Buf; |
| StringRef Body = M->Body; |
| |
| if (expandMacro(Buf, Body, M->Parameters, MacroArguments, getTok().getLoc())) |
| return true; |
| |
| MemoryBuffer *Instantiation = |
| MemoryBuffer::getMemBufferCopy(Buf.str(), "<instantiation>"); |
| |
| // Create the macro instantiation object and add to the current macro |
| // instantiation stack. |
| MacroInstantiation *MI = new MacroInstantiation(M, NameLoc, |
| getTok().getLoc(), |
| Instantiation); |
| ActiveMacros.push_back(MI); |
| |
| // Jump to the macro instantiation and prime the lexer. |
| CurBuffer = SrcMgr.AddNewSourceBuffer(MI->Instantiation, SMLoc()); |
| Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)); |
| Lex(); |
| |
| return false; |
| } |
| |
| void AsmParser::HandleMacroExit() { |
| // Jump to the EndOfStatement we should return to, and consume it. |
| JumpToLoc(ActiveMacros.back()->ExitLoc); |
| Lex(); |
| |
| // Pop the instantiation entry. |
| delete ActiveMacros.back(); |
| ActiveMacros.pop_back(); |
| } |
| |
| static void MarkUsed(const MCExpr *Value) { |
| switch (Value->getKind()) { |
| case MCExpr::Binary: |
| MarkUsed(static_cast<const MCBinaryExpr*>(Value)->getLHS()); |
| MarkUsed(static_cast<const MCBinaryExpr*>(Value)->getRHS()); |
| break; |
| case MCExpr::Target: |
| case MCExpr::Constant: |
| break; |
| case MCExpr::SymbolRef: { |
| static_cast<const MCSymbolRefExpr*>(Value)->getSymbol().setUsed(true); |
| break; |
| } |
| case MCExpr::Unary: |
| MarkUsed(static_cast<const MCUnaryExpr*>(Value)->getSubExpr()); |
| break; |
| } |
| } |
| |
| bool AsmParser::ParseAssignment(StringRef Name, bool allow_redef) { |
| // FIXME: Use better location, we should use proper tokens. |
| SMLoc EqualLoc = Lexer.getLoc(); |
| |
| const MCExpr *Value; |
| if (ParseExpression(Value)) |
| return true; |
| |
| MarkUsed(Value); |
| |
| if (Lexer.isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in assignment"); |
| |
| // Error on assignment to '.'. |
| if (Name == ".") { |
| return Error(EqualLoc, ("assignment to pseudo-symbol '.' is unsupported " |
| "(use '.space' or '.org').)")); |
| } |
| |
| // Eat the end of statement marker. |
| Lex(); |
| |
| // Validate that the LHS is allowed to be a variable (either it has not been |
| // used as a symbol, or it is an absolute symbol). |
| MCSymbol *Sym = getContext().LookupSymbol(Name); |
| if (Sym) { |
| // Diagnose assignment to a label. |
| // |
| // FIXME: Diagnostics. Note the location of the definition as a label. |
| // FIXME: Diagnose assignment to protected identifier (e.g., register name). |
| if (Sym->isUndefined() && !Sym->isUsed() && !Sym->isVariable()) |
| ; // Allow redefinitions of undefined symbols only used in directives. |
| else if (!Sym->isUndefined() && (!Sym->isVariable() || !allow_redef)) |
| return Error(EqualLoc, "redefinition of '" + Name + "'"); |
| else if (!Sym->isVariable()) |
| return Error(EqualLoc, "invalid assignment to '" + Name + "'"); |
| else if (!isa<MCConstantExpr>(Sym->getVariableValue())) |
| return Error(EqualLoc, "invalid reassignment of non-absolute variable '" + |
| Name + "'"); |
| |
| // Don't count these checks as uses. |
| Sym->setUsed(false); |
| } else |
| Sym = getContext().GetOrCreateSymbol(Name); |
| |
| // FIXME: Handle '.'. |
| |
| // Do the assignment. |
| Out.EmitAssignment(Sym, Value); |
| |
| return false; |
| } |
| |
| /// ParseIdentifier: |
| /// ::= identifier |
| /// ::= string |
| bool AsmParser::ParseIdentifier(StringRef &Res) { |
| // The assembler has relaxed rules for accepting identifiers, in particular we |
| // allow things like '.globl $foo', which would normally be separate |
| // tokens. At this level, we have already lexed so we cannot (currently) |
| // handle this as a context dependent token, instead we detect adjacent tokens |
| // and return the combined identifier. |
| if (Lexer.is(AsmToken::Dollar)) { |
| SMLoc DollarLoc = getLexer().getLoc(); |
| |
| // Consume the dollar sign, and check for a following identifier. |
| Lex(); |
| if (Lexer.isNot(AsmToken::Identifier)) |
| return true; |
| |
| // We have a '$' followed by an identifier, make sure they are adjacent. |
| if (DollarLoc.getPointer() + 1 != getTok().getLoc().getPointer()) |
| return true; |
| |
| // Construct the joined identifier and consume the token. |
| Res = StringRef(DollarLoc.getPointer(), |
| getTok().getIdentifier().size() + 1); |
| Lex(); |
| return false; |
| } |
| |
| if (Lexer.isNot(AsmToken::Identifier) && |
| Lexer.isNot(AsmToken::String)) |
| return true; |
| |
| Res = getTok().getIdentifier(); |
| |
| Lex(); // Consume the identifier token. |
| |
| return false; |
| } |
| |
| /// ParseDirectiveSet: |
| /// ::= .equ identifier ',' expression |
| /// ::= .equiv identifier ',' expression |
| /// ::= .set identifier ',' expression |
| bool AsmParser::ParseDirectiveSet(StringRef IDVal, bool allow_redef) { |
| StringRef Name; |
| |
| if (ParseIdentifier(Name)) |
| return TokError("expected identifier after '" + Twine(IDVal) + "'"); |
| |
| if (getLexer().isNot(AsmToken::Comma)) |
| return TokError("unexpected token in '" + Twine(IDVal) + "'"); |
| Lex(); |
| |
| return ParseAssignment(Name, allow_redef); |
| } |
| |
| bool AsmParser::ParseEscapedString(std::string &Data) { |
| assert(getLexer().is(AsmToken::String) && "Unexpected current token!"); |
| |
| Data = ""; |
| StringRef Str = getTok().getStringContents(); |
| for (unsigned i = 0, e = Str.size(); i != e; ++i) { |
| if (Str[i] != '\\') { |
| Data += Str[i]; |
| continue; |
| } |
| |
| // Recognize escaped characters. Note that this escape semantics currently |
| // loosely follows Darwin 'as'. Notably, it doesn't support hex escapes. |
| ++i; |
| if (i == e) |
| return TokError("unexpected backslash at end of string"); |
| |
| // Recognize octal sequences. |
| if ((unsigned) (Str[i] - '0') <= 7) { |
| // Consume up to three octal characters. |
| unsigned Value = Str[i] - '0'; |
| |
| if (i + 1 != e && ((unsigned) (Str[i + 1] - '0')) <= 7) { |
| ++i; |
| Value = Value * 8 + (Str[i] - '0'); |
| |
| if (i + 1 != e && ((unsigned) (Str[i + 1] - '0')) <= 7) { |
| ++i; |
| Value = Value * 8 + (Str[i] - '0'); |
| } |
| } |
| |
| if (Value > 255) |
| return TokError("invalid octal escape sequence (out of range)"); |
| |
| Data += (unsigned char) Value; |
| continue; |
| } |
| |
| // Otherwise recognize individual escapes. |
| switch (Str[i]) { |
| default: |
| // Just reject invalid escape sequences for now. |
| return TokError("invalid escape sequence (unrecognized character)"); |
| |
| case 'b': Data += '\b'; break; |
| case 'f': Data += '\f'; break; |
| case 'n': Data += '\n'; break; |
| case 'r': Data += '\r'; break; |
| case 't': Data += '\t'; break; |
| case '"': Data += '"'; break; |
| case '\\': Data += '\\'; break; |
| } |
| } |
| |
| return false; |
| } |
| |
| /// ParseDirectiveAscii: |
| /// ::= ( .ascii | .asciz | .string ) [ "string" ( , "string" )* ] |
| bool AsmParser::ParseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) { |
| if (getLexer().isNot(AsmToken::EndOfStatement)) { |
| CheckForValidSection(); |
| |
| for (;;) { |
| if (getLexer().isNot(AsmToken::String)) |
| return TokError("expected string in '" + Twine(IDVal) + "' directive"); |
| |
| std::string Data; |
| if (ParseEscapedString(Data)) |
| return true; |
| |
| getStreamer().EmitBytes(Data, DEFAULT_ADDRSPACE); |
| if (ZeroTerminated) |
| getStreamer().EmitBytes(StringRef("\0", 1), DEFAULT_ADDRSPACE); |
| |
| Lex(); |
| |
| if (getLexer().is(AsmToken::EndOfStatement)) |
| break; |
| |
| if (getLexer().isNot(AsmToken::Comma)) |
| return TokError("unexpected token in '" + Twine(IDVal) + "' directive"); |
| Lex(); |
| } |
| } |
| |
| Lex(); |
| return false; |
| } |
| |
| /// ParseDirectiveValue |
| /// ::= (.byte | .short | ... ) [ expression (, expression)* ] |
| bool AsmParser::ParseDirectiveValue(unsigned Size) { |
| if (getLexer().isNot(AsmToken::EndOfStatement)) { |
| CheckForValidSection(); |
| |
| for (;;) { |
| const MCExpr *Value; |
| SMLoc ExprLoc = getLexer().getLoc(); |
| if (ParseExpression(Value)) |
| return true; |
| |
| // Special case constant expressions to match code generator. |
| if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { |
| assert(Size <= 8 && "Invalid size"); |
| uint64_t IntValue = MCE->getValue(); |
| if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue)) |
| return Error(ExprLoc, "literal value out of range for directive"); |
| getStreamer().EmitIntValue(IntValue, Size, DEFAULT_ADDRSPACE); |
| } else |
| getStreamer().EmitValue(Value, Size, DEFAULT_ADDRSPACE); |
| |
| if (getLexer().is(AsmToken::EndOfStatement)) |
| break; |
| |
| // FIXME: Improve diagnostic. |
| if (getLexer().isNot(AsmToken::Comma)) |
| return TokError("unexpected token in directive"); |
| Lex(); |
| } |
| } |
| |
| Lex(); |
| return false; |
| } |
| |
| /// ParseDirectiveRealValue |
| /// ::= (.single | .double) [ expression (, expression)* ] |
| bool AsmParser::ParseDirectiveRealValue(const fltSemantics &Semantics) { |
| if (getLexer().isNot(AsmToken::EndOfStatement)) { |
| CheckForValidSection(); |
| |
| for (;;) { |
| // We don't truly support arithmetic on floating point expressions, so we |
| // have to manually parse unary prefixes. |
| bool IsNeg = false; |
| if (getLexer().is(AsmToken::Minus)) { |
| Lex(); |
| IsNeg = true; |
| } else if (getLexer().is(AsmToken::Plus)) |
| Lex(); |
| |
| if (getLexer().isNot(AsmToken::Integer) && |
| getLexer().isNot(AsmToken::Real) && |
| getLexer().isNot(AsmToken::Identifier)) |
| return TokError("unexpected token in directive"); |
| |
| // Convert to an APFloat. |
| APFloat Value(Semantics); |
| StringRef IDVal = getTok().getString(); |
| if (getLexer().is(AsmToken::Identifier)) { |
| if (!IDVal.compare_lower("infinity") || !IDVal.compare_lower("inf")) |
| Value = APFloat::getInf(Semantics); |
| else if (!IDVal.compare_lower("nan")) |
| Value = APFloat::getNaN(Semantics, false, ~0); |
| else |
| return TokError("invalid floating point literal"); |
| } else if (Value.convertFromString(IDVal, APFloat::rmNearestTiesToEven) == |
| APFloat::opInvalidOp) |
| return TokError("invalid floating point literal"); |
| if (IsNeg) |
| Value.changeSign(); |
| |
| // Consume the numeric token. |
| Lex(); |
| |
| // Emit the value as an integer. |
| APInt AsInt = Value.bitcastToAPInt(); |
| getStreamer().EmitIntValue(AsInt.getLimitedValue(), |
| AsInt.getBitWidth() / 8, DEFAULT_ADDRSPACE); |
| |
| if (getLexer().is(AsmToken::EndOfStatement)) |
| break; |
| |
| if (getLexer().isNot(AsmToken::Comma)) |
| return TokError("unexpected token in directive"); |
| Lex(); |
| } |
| } |
| |
| Lex(); |
| return false; |
| } |
| |
| /// ParseDirectiveSpace |
| /// ::= .space expression [ , expression ] |
| bool AsmParser::ParseDirectiveSpace() { |
| CheckForValidSection(); |
| |
| int64_t NumBytes; |
| if (ParseAbsoluteExpression(NumBytes)) |
| return true; |
| |
| int64_t FillExpr = 0; |
| if (getLexer().isNot(AsmToken::EndOfStatement)) { |
| if (getLexer().isNot(AsmToken::Comma)) |
| return TokError("unexpected token in '.space' directive"); |
| Lex(); |
| |
| if (ParseAbsoluteExpression(FillExpr)) |
| return true; |
| |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in '.space' directive"); |
| } |
| |
| Lex(); |
| |
| if (NumBytes <= 0) |
| return TokError("invalid number of bytes in '.space' directive"); |
| |
| // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0. |
| getStreamer().EmitFill(NumBytes, FillExpr, DEFAULT_ADDRSPACE); |
| |
| return false; |
| } |
| |
| /// ParseDirectiveZero |
| /// ::= .zero expression |
| bool AsmParser::ParseDirectiveZero() { |
| CheckForValidSection(); |
| |
| int64_t NumBytes; |
| if (ParseAbsoluteExpression(NumBytes)) |
| return true; |
| |
| int64_t Val = 0; |
| if (getLexer().is(AsmToken::Comma)) { |
| Lex(); |
| if (ParseAbsoluteExpression(Val)) |
| return true; |
| } |
| |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in '.zero' directive"); |
| |
| Lex(); |
| |
| getStreamer().EmitFill(NumBytes, Val, DEFAULT_ADDRSPACE); |
| |
| return false; |
| } |
| |
| /// ParseDirectiveFill |
| /// ::= .fill expression , expression , expression |
| bool AsmParser::ParseDirectiveFill() { |
| CheckForValidSection(); |
| |
| int64_t NumValues; |
| if (ParseAbsoluteExpression(NumValues)) |
| return true; |
| |
| if (getLexer().isNot(AsmToken::Comma)) |
| return TokError("unexpected token in '.fill' directive"); |
| Lex(); |
| |
| int64_t FillSize; |
| if (ParseAbsoluteExpression(FillSize)) |
| return true; |
| |
| if (getLexer().isNot(AsmToken::Comma)) |
| return TokError("unexpected token in '.fill' directive"); |
| Lex(); |
| |
| int64_t FillExpr; |
| if (ParseAbsoluteExpression(FillExpr)) |
| return true; |
| |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in '.fill' directive"); |
| |
| Lex(); |
| |
| if (FillSize != 1 && FillSize != 2 && FillSize != 4 && FillSize != 8) |
| return TokError("invalid '.fill' size, expected 1, 2, 4, or 8"); |
| |
| for (uint64_t i = 0, e = NumValues; i != e; ++i) |
| getStreamer().EmitIntValue(FillExpr, FillSize, DEFAULT_ADDRSPACE); |
| |
| return false; |
| } |
| |
| /// ParseDirectiveOrg |
| /// ::= .org expression [ , expression ] |
| bool AsmParser::ParseDirectiveOrg() { |
| CheckForValidSection(); |
| |
| const MCExpr *Offset; |
| if (ParseExpression(Offset)) |
| return true; |
| |
| // Parse optional fill expression. |
| int64_t FillExpr = 0; |
| if (getLexer().isNot(AsmToken::EndOfStatement)) { |
| if (getLexer().isNot(AsmToken::Comma)) |
| return TokError("unexpected token in '.org' directive"); |
| Lex(); |
| |
| if (ParseAbsoluteExpression(FillExpr)) |
| return true; |
| |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in '.org' directive"); |
| } |
| |
| Lex(); |
| |
| // FIXME: Only limited forms of relocatable expressions are accepted here, it |
| // has to be relative to the current section. |
| getStreamer().EmitValueToOffset(Offset, FillExpr); |
| |
| return false; |
| } |
| |
| /// ParseDirectiveAlign |
| /// ::= {.align, ...} expression [ , expression [ , expression ]] |
| bool AsmParser::ParseDirectiveAlign(bool IsPow2, unsigned ValueSize) { |
| CheckForValidSection(); |
| |
| SMLoc AlignmentLoc = getLexer().getLoc(); |
| int64_t Alignment; |
| if (ParseAbsoluteExpression(Alignment)) |
| return true; |
| |
| SMLoc MaxBytesLoc; |
| bool HasFillExpr = false; |
| int64_t FillExpr = 0; |
| int64_t MaxBytesToFill = 0; |
| if (getLexer().isNot(AsmToken::EndOfStatement)) { |
| if (getLexer().isNot(AsmToken::Comma)) |
| return TokError("unexpected token in directive"); |
| Lex(); |
| |
| // The fill expression can be omitted while specifying a maximum number of |
| // alignment bytes, e.g: |
| // .align 3,,4 |
| if (getLexer().isNot(AsmToken::Comma)) { |
| HasFillExpr = true; |
| if (ParseAbsoluteExpression(FillExpr)) |
| return true; |
| } |
| |
| if (getLexer().isNot(AsmToken::EndOfStatement)) { |
| if (getLexer().isNot(AsmToken::Comma)) |
| return TokError("unexpected token in directive"); |
| Lex(); |
| |
| MaxBytesLoc = getLexer().getLoc(); |
| if (ParseAbsoluteExpression(MaxBytesToFill)) |
| return true; |
| |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in directive"); |
| } |
| } |
| |
| Lex(); |
| |
| if (!HasFillExpr) |
| FillExpr = 0; |
| |
| // Compute alignment in bytes. |
| if (IsPow2) { |
| // FIXME: Diagnose overflow. |
| if (Alignment >= 32) { |
| Error(AlignmentLoc, "invalid alignment value"); |
| Alignment = 31; |
| } |
| |
| Alignment = 1ULL << Alignment; |
| } |
| |
| // Diagnose non-sensical max bytes to align. |
| if (MaxBytesLoc.isValid()) { |
| if (MaxBytesToFill < 1) { |
| Error(MaxBytesLoc, "alignment directive can never be satisfied in this " |
| "many bytes, ignoring maximum bytes expression"); |
| MaxBytesToFill = 0; |
| } |
| |
| if (MaxBytesToFill >= Alignment) { |
| Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and " |
| "has no effect"); |
| MaxBytesToFill = 0; |
| } |
| } |
| |
| // Check whether we should use optimal code alignment for this .align |
| // directive. |
| bool UseCodeAlign = getStreamer().getCurrentSection()->UseCodeAlign(); |
| if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) && |
| ValueSize == 1 && UseCodeAlign) { |
| getStreamer().EmitCodeAlignment(Alignment, MaxBytesToFill); |
| } else { |
| // FIXME: Target specific behavior about how the "extra" bytes are filled. |
| getStreamer().EmitValueToAlignment(Alignment, FillExpr, ValueSize, |
| MaxBytesToFill); |
| } |
| |
| return false; |
| } |
| |
| /// ParseDirectiveSymbolAttribute |
| /// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ] |
| bool AsmParser::ParseDirectiveSymbolAttribute(MCSymbolAttr Attr) { |
| if (getLexer().isNot(AsmToken::EndOfStatement)) { |
| for (;;) { |
| StringRef Name; |
| SMLoc Loc = getTok().getLoc(); |
| |
| if (ParseIdentifier(Name)) |
| return Error(Loc, "expected identifier in directive"); |
| |
| MCSymbol *Sym = getContext().GetOrCreateSymbol(Name); |
| |
| // Assembler local symbols don't make any sense here. Complain loudly. |
| if (Sym->isTemporary()) |
| return Error(Loc, "non-local symbol required in directive"); |
| |
| getStreamer().EmitSymbolAttribute(Sym, Attr); |
| |
| if (getLexer().is(AsmToken::EndOfStatement)) |
| break; |
| |
| if (getLexer().isNot(AsmToken::Comma)) |
| return TokError("unexpected token in directive"); |
| Lex(); |
| } |
| } |
| |
| Lex(); |
| return false; |
| } |
| |
| /// ParseDirectiveComm |
| /// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ] |
| bool AsmParser::ParseDirectiveComm(bool IsLocal) { |
| CheckForValidSection(); |
| |
| SMLoc IDLoc = getLexer().getLoc(); |
| StringRef Name; |
| if (ParseIdentifier(Name)) |
| return TokError("expected identifier in directive"); |
| |
| // Handle the identifier as the key symbol. |
| MCSymbol *Sym = getContext().GetOrCreateSymbol(Name); |
| |
| if (getLexer().isNot(AsmToken::Comma)) |
| return TokError("unexpected token in directive"); |
| Lex(); |
| |
| int64_t Size; |
| SMLoc SizeLoc = getLexer().getLoc(); |
| if (ParseAbsoluteExpression(Size)) |
| return true; |
| |
| int64_t Pow2Alignment = 0; |
| SMLoc Pow2AlignmentLoc; |
| if (getLexer().is(AsmToken::Comma)) { |
| Lex(); |
| Pow2AlignmentLoc = getLexer().getLoc(); |
| if (ParseAbsoluteExpression(Pow2Alignment)) |
| return true; |
| |
| // If this target takes alignments in bytes (not log) validate and convert. |
| if (Lexer.getMAI().getAlignmentIsInBytes()) { |
| if (!isPowerOf2_64(Pow2Alignment)) |
| return Error(Pow2AlignmentLoc, "alignment must be a power of 2"); |
| Pow2Alignment = Log2_64(Pow2Alignment); |
| } |
| } |
| |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in '.comm' or '.lcomm' directive"); |
| |
| Lex(); |
| |
| // NOTE: a size of zero for a .comm should create a undefined symbol |
| // but a size of .lcomm creates a bss symbol of size zero. |
| if (Size < 0) |
| return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't " |
| "be less than zero"); |
| |
| // NOTE: The alignment in the directive is a power of 2 value, the assembler |
| // may internally end up wanting an alignment in bytes. |
| // FIXME: Diagnose overflow. |
| if (Pow2Alignment < 0) |
| return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive " |
| "alignment, can't be less than zero"); |
| |
| if (!Sym->isUndefined()) |
| return Error(IDLoc, "invalid symbol redefinition"); |
| |
| // '.lcomm' is equivalent to '.zerofill'. |
| // Create the Symbol as a common or local common with Size and Pow2Alignment |
| if (IsLocal) { |
| getStreamer().EmitZerofill(Ctx.getMachOSection( |
| "__DATA", "__bss", MCSectionMachO::S_ZEROFILL, |
| 0, SectionKind::getBSS()), |
| Sym, Size, 1 << Pow2Alignment); |
| return false; |
| } |
| |
| getStreamer().EmitCommonSymbol(Sym, Size, 1 << Pow2Alignment); |
| return false; |
| } |
| |
| /// ParseDirectiveAbort |
| /// ::= .abort [... message ...] |
| bool AsmParser::ParseDirectiveAbort() { |
| // FIXME: Use loc from directive. |
| SMLoc Loc = getLexer().getLoc(); |
| |
| StringRef Str = ParseStringToEndOfStatement(); |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in '.abort' directive"); |
| |
| Lex(); |
| |
| if (Str.empty()) |
| Error(Loc, ".abort detected. Assembly stopping."); |
| else |
| Error(Loc, ".abort '" + Str + "' detected. Assembly stopping."); |
| // FIXME: Actually abort assembly here. |
| |
| return false; |
| } |
| |
| /// ParseDirectiveInclude |
| /// ::= .include "filename" |
| bool AsmParser::ParseDirectiveInclude() { |
| if (getLexer().isNot(AsmToken::String)) |
| return TokError("expected string in '.include' directive"); |
| |
| std::string Filename = getTok().getString(); |
| SMLoc IncludeLoc = getLexer().getLoc(); |
| Lex(); |
| |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in '.include' directive"); |
| |
| // Strip the quotes. |
| Filename = Filename.substr(1, Filename.size()-2); |
| |
| // Attempt to switch the lexer to the included file before consuming the end |
| // of statement to avoid losing it when we switch. |
| if (EnterIncludeFile(Filename)) { |
| Error(IncludeLoc, "Could not find include file '" + Filename + "'"); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /// ParseDirectiveIncbin |
| /// ::= .incbin "filename" |
| bool AsmParser::ParseDirectiveIncbin() { |
| if (getLexer().isNot(AsmToken::String)) |
| return TokError("expected string in '.incbin' directive"); |
| |
| std::string Filename = getTok().getString(); |
| SMLoc IncbinLoc = getLexer().getLoc(); |
| Lex(); |
| |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in '.incbin' directive"); |
| |
| // Strip the quotes. |
| Filename = Filename.substr(1, Filename.size()-2); |
| |
| // Attempt to process the included file. |
| if (ProcessIncbinFile(Filename)) { |
| Error(IncbinLoc, "Could not find incbin file '" + Filename + "'"); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /// ParseDirectiveIf |
| /// ::= .if expression |
| bool AsmParser::ParseDirectiveIf(SMLoc DirectiveLoc) { |
| TheCondStack.push_back(TheCondState); |
| TheCondState.TheCond = AsmCond::IfCond; |
| if(TheCondState.Ignore) { |
| EatToEndOfStatement(); |
| } |
| else { |
| int64_t ExprValue; |
| if (ParseAbsoluteExpression(ExprValue)) |
| return true; |
| |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in '.if' directive"); |
| |
| Lex(); |
| |
| TheCondState.CondMet = ExprValue; |
| TheCondState.Ignore = !TheCondState.CondMet; |
| } |
| |
| return false; |
| } |
| |
| bool AsmParser::ParseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined) { |
| StringRef Name; |
| TheCondStack.push_back(TheCondState); |
| TheCondState.TheCond = AsmCond::IfCond; |
| |
| if (TheCondState.Ignore) { |
| EatToEndOfStatement(); |
| } else { |
| if (ParseIdentifier(Name)) |
| return TokError("expected identifier after '.ifdef'"); |
| |
| Lex(); |
| |
| MCSymbol *Sym = getContext().LookupSymbol(Name); |
| |
| if (expect_defined) |
| TheCondState.CondMet = (Sym != NULL && !Sym->isUndefined()); |
| else |
| TheCondState.CondMet = (Sym == NULL || Sym->isUndefined()); |
| TheCondState.Ignore = !TheCondState.CondMet; |
| } |
| |
| return false; |
| } |
| |
| /// ParseDirectiveElseIf |
| /// ::= .elseif expression |
| bool AsmParser::ParseDirectiveElseIf(SMLoc DirectiveLoc) { |
| if (TheCondState.TheCond != AsmCond::IfCond && |
| TheCondState.TheCond != AsmCond::ElseIfCond) |
| Error(DirectiveLoc, "Encountered a .elseif that doesn't follow a .if or " |
| " an .elseif"); |
| TheCondState.TheCond = AsmCond::ElseIfCond; |
| |
| bool LastIgnoreState = false; |
| if (!TheCondStack.empty()) |
| LastIgnoreState = TheCondStack.back().Ignore; |
| if (LastIgnoreState || TheCondState.CondMet) { |
| TheCondState.Ignore = true; |
| EatToEndOfStatement(); |
| } |
| else { |
| int64_t ExprValue; |
| if (ParseAbsoluteExpression(ExprValue)) |
| return true; |
| |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in '.elseif' directive"); |
| |
| Lex(); |
| TheCondState.CondMet = ExprValue; |
| TheCondState.Ignore = !TheCondState.CondMet; |
| } |
| |
| return false; |
| } |
| |
| /// ParseDirectiveElse |
| /// ::= .else |
| bool AsmParser::ParseDirectiveElse(SMLoc DirectiveLoc) { |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in '.else' directive"); |
| |
| Lex(); |
| |
| if (TheCondState.TheCond != AsmCond::IfCond && |
| TheCondState.TheCond != AsmCond::ElseIfCond) |
| Error(DirectiveLoc, "Encountered a .else that doesn't follow a .if or an " |
| ".elseif"); |
| TheCondState.TheCond = AsmCond::ElseCond; |
| bool LastIgnoreState = false; |
| if (!TheCondStack.empty()) |
| LastIgnoreState = TheCondStack.back().Ignore; |
| if (LastIgnoreState || TheCondState.CondMet) |
| TheCondState.Ignore = true; |
| else |
| TheCondState.Ignore = false; |
| |
| return false; |
| } |
| |
| /// ParseDirectiveEndIf |
| /// ::= .endif |
| bool AsmParser::ParseDirectiveEndIf(SMLoc DirectiveLoc) { |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in '.endif' directive"); |
| |
| Lex(); |
| |
| if ((TheCondState.TheCond == AsmCond::NoCond) || |
| TheCondStack.empty()) |
| Error(DirectiveLoc, "Encountered a .endif that doesn't follow a .if or " |
| ".else"); |
| if (!TheCondStack.empty()) { |
| TheCondState = TheCondStack.back(); |
| TheCondStack.pop_back(); |
| } |
| |
| return false; |
| } |
| |
| /// ParseDirectiveFile |
| /// ::= .file [number] filename |
| /// ::= .file number directory filename |
| bool GenericAsmParser::ParseDirectiveFile(StringRef, SMLoc DirectiveLoc) { |
| // FIXME: I'm not sure what this is. |
| int64_t FileNumber = -1; |
| SMLoc FileNumberLoc = getLexer().getLoc(); |
| if (getLexer().is(AsmToken::Integer)) { |
| FileNumber = getTok().getIntVal(); |
| Lex(); |
| |
| if (FileNumber < 1) |
| return TokError("file number less than one"); |
| } |
| |
| if (getLexer().isNot(AsmToken::String)) |
| return TokError("unexpected token in '.file' directive"); |
| |
| // Usually the directory and filename together, otherwise just the directory. |
| StringRef Path = getTok().getString(); |
| Path = Path.substr(1, Path.size()-2); |
| Lex(); |
| |
| StringRef Directory; |
| StringRef Filename; |
| if (getLexer().is(AsmToken::String)) { |
| if (FileNumber == -1) |
| return TokError("explicit path specified, but no file number"); |
| Filename = getTok().getString(); |
| Filename = Filename.substr(1, Filename.size()-2); |
| Directory = Path; |
| Lex(); |
| } else { |
| Filename = Path; |
| } |
| |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in '.file' directive"); |
| |
| if (getContext().getGenDwarfForAssembly() == true) |
| Error(DirectiveLoc, "input can't have .file dwarf directives when -g is " |
| "used to generate dwarf debug info for assembly code"); |
| |
| if (FileNumber == -1) |
| getStreamer().EmitFileDirective(Filename); |
| else { |
| if (getStreamer().EmitDwarfFileDirective(FileNumber, Directory, Filename)) |
| Error(FileNumberLoc, "file number already allocated"); |
| } |
| |
| return false; |
| } |
| |
| /// ParseDirectiveLine |
| /// ::= .line [number] |
| bool GenericAsmParser::ParseDirectiveLine(StringRef, SMLoc DirectiveLoc) { |
| if (getLexer().isNot(AsmToken::EndOfStatement)) { |
| if (getLexer().isNot(AsmToken::Integer)) |
| return TokError("unexpected token in '.line' directive"); |
| |
| int64_t LineNumber = getTok().getIntVal(); |
| (void) LineNumber; |
| Lex(); |
| |
| // FIXME: Do something with the .line. |
| } |
| |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in '.line' directive"); |
| |
| return false; |
| } |
| |
| |
| /// ParseDirectiveLoc |
| /// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end] |
| /// [epilogue_begin] [is_stmt VALUE] [isa VALUE] |
| /// The first number is a file number, must have been previously assigned with |
| /// a .file directive, the second number is the line number and optionally the |
| /// third number is a column position (zero if not specified). The remaining |
| /// optional items are .loc sub-directives. |
| bool GenericAsmParser::ParseDirectiveLoc(StringRef, SMLoc DirectiveLoc) { |
| |
| if (getLexer().isNot(AsmToken::Integer)) |
| return TokError("unexpected token in '.loc' directive"); |
| int64_t FileNumber = getTok().getIntVal(); |
| if (FileNumber < 1) |
| return TokError("file number less than one in '.loc' directive"); |
| if (!getContext().isValidDwarfFileNumber(FileNumber)) |
| return TokError("unassigned file number in '.loc' directive"); |
| Lex(); |
| |
| int64_t LineNumber = 0; |
| if (getLexer().is(AsmToken::Integer)) { |
| LineNumber = getTok().getIntVal(); |
| if (LineNumber < 1) |
| return TokError("line number less than one in '.loc' directive"); |
| Lex(); |
| } |
| |
| int64_t ColumnPos = 0; |
| if (getLexer().is(AsmToken::Integer)) { |
| ColumnPos = getTok().getIntVal(); |
| if (ColumnPos < 0) |
| return TokError("column position less than zero in '.loc' directive"); |
| Lex(); |
| } |
| |
| unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0; |
| unsigned Isa = 0; |
| int64_t Discriminator = 0; |
| if (getLexer().isNot(AsmToken::EndOfStatement)) { |
| for (;;) { |
| if (getLexer().is(AsmToken::EndOfStatement)) |
| break; |
| |
| StringRef Name; |
| SMLoc Loc = getTok().getLoc(); |
| if (getParser().ParseIdentifier(Name)) |
| return TokError("unexpected token in '.loc' directive"); |
| |
| if (Name == "basic_block") |
| Flags |= DWARF2_FLAG_BASIC_BLOCK; |
| else if (Name == "prologue_end") |
| Flags |= DWARF2_FLAG_PROLOGUE_END; |
| else if (Name == "epilogue_begin") |
| Flags |= DWARF2_FLAG_EPILOGUE_BEGIN; |
| else if (Name == "is_stmt") { |
| SMLoc Loc = getTok().getLoc(); |
| const MCExpr *Value; |
| if (getParser().ParseExpression(Value)) |
| return true; |
| // The expression must be the constant 0 or 1. |
| if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { |
| int Value = MCE->getValue(); |
| if (Value == 0) |
| Flags &= ~DWARF2_FLAG_IS_STMT; |
| else if (Value == 1) |
| Flags |= DWARF2_FLAG_IS_STMT; |
| else |
| return Error(Loc, "is_stmt value not 0 or 1"); |
| } |
| else { |
| return Error(Loc, "is_stmt value not the constant value of 0 or 1"); |
| } |
| } |
| else if (Name == "isa") { |
| SMLoc Loc = getTok().getLoc(); |
| const MCExpr *Value; |
| if (getParser().ParseExpression(Value)) |
| return true; |
| // The expression must be a constant greater or equal to 0. |
| if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { |
| int Value = MCE->getValue(); |
| if (Value < 0) |
| return Error(Loc, "isa number less than zero"); |
| Isa = Value; |
| } |
| else { |
| return Error(Loc, "isa number not a constant value"); |
| } |
| } |
| else if (Name == "discriminator") { |
| if (getParser().ParseAbsoluteExpression(Discriminator)) |
| return true; |
| } |
| else { |
| return Error(Loc, "unknown sub-directive in '.loc' directive"); |
| } |
| |
| if (getLexer().is(AsmToken::EndOfStatement)) |
| break; |
| } |
| } |
| |
| getStreamer().EmitDwarfLocDirective(FileNumber, LineNumber, ColumnPos, Flags, |
| Isa, Discriminator, StringRef()); |
| |
| return false; |
| } |
| |
| /// ParseDirectiveStabs |
| /// ::= .stabs string, number, number, number |
| bool GenericAsmParser::ParseDirectiveStabs(StringRef Directive, |
| SMLoc DirectiveLoc) { |
| return TokError("unsupported directive '" + Directive + "'"); |
| } |
| |
| /// ParseDirectiveCFISections |
| /// ::= .cfi_sections section [, section] |
| bool GenericAsmParser::ParseDirectiveCFISections(StringRef, |
| SMLoc DirectiveLoc) { |
| StringRef Name; |
| bool EH = false; |
| bool Debug = false; |
| |
| if (getParser().ParseIdentifier(Name)) |
| return TokError("Expected an identifier"); |
| |
| if (Name == ".eh_frame") |
| EH = true; |
| else if (Name == ".debug_frame") |
| Debug = true; |
| |
| if (getLexer().is(AsmToken::Comma)) { |
| Lex(); |
| |
| if (getParser().ParseIdentifier(Name)) |
| return TokError("Expected an identifier"); |
| |
| if (Name == ".eh_frame") |
| EH = true; |
| else if (Name == ".debug_frame") |
| Debug = true; |
| } |
| |
| getStreamer().EmitCFISections(EH, Debug); |
| |
| return false; |
| } |
| |
| /// ParseDirectiveCFIStartProc |
| /// ::= .cfi_startproc |
| bool GenericAsmParser::ParseDirectiveCFIStartProc(StringRef, |
| SMLoc DirectiveLoc) { |
| getStreamer().EmitCFIStartProc(); |
| return false; |
| } |
| |
| /// ParseDirectiveCFIEndProc |
| /// ::= .cfi_endproc |
| bool GenericAsmParser::ParseDirectiveCFIEndProc(StringRef, SMLoc DirectiveLoc) { |
| getStreamer().EmitCFIEndProc(); |
| return false; |
| } |
| |
| /// ParseRegisterOrRegisterNumber - parse register name or number. |
| bool GenericAsmParser::ParseRegisterOrRegisterNumber(int64_t &Register, |
| SMLoc DirectiveLoc) { |
| unsigned RegNo; |
| |
| if (getLexer().isNot(AsmToken::Integer)) { |
| if (getParser().getTargetParser().ParseRegister(RegNo, DirectiveLoc, |
| DirectiveLoc)) |
| return true; |
| Register = getContext().getRegisterInfo().getDwarfRegNum(RegNo, true); |
| } else |
| return getParser().ParseAbsoluteExpression(Register); |
| |
| return false; |
| } |
| |
| /// ParseDirectiveCFIDefCfa |
| /// ::= .cfi_def_cfa register, offset |
| bool GenericAsmParser::ParseDirectiveCFIDefCfa(StringRef, |
| SMLoc DirectiveLoc) { |
| int64_t Register = 0; |
| if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc)) |
| return true; |
| |
| if (getLexer().isNot(AsmToken::Comma)) |
| return TokError("unexpected token in directive"); |
| Lex(); |
| |
| int64_t Offset = 0; |
| if (getParser().ParseAbsoluteExpression(Offset)) |
| return true; |
| |
| getStreamer().EmitCFIDefCfa(Register, Offset); |
| return false; |
| } |
| |
| /// ParseDirectiveCFIDefCfaOffset |
| /// ::= .cfi_def_cfa_offset offset |
| bool GenericAsmParser::ParseDirectiveCFIDefCfaOffset(StringRef, |
| SMLoc DirectiveLoc) { |
| int64_t Offset = 0; |
| if (getParser().ParseAbsoluteExpression(Offset)) |
| return true; |
| |
| getStreamer().EmitCFIDefCfaOffset(Offset); |
| return false; |
| } |
| |
| /// ParseDirectiveCFIAdjustCfaOffset |
| /// ::= .cfi_adjust_cfa_offset adjustment |
| bool GenericAsmParser::ParseDirectiveCFIAdjustCfaOffset(StringRef, |
| SMLoc DirectiveLoc) { |
| int64_t Adjustment = 0; |
| if (getParser().ParseAbsoluteExpression(Adjustment)) |
| return true; |
| |
| getStreamer().EmitCFIAdjustCfaOffset(Adjustment); |
| return false; |
| } |
| |
| /// ParseDirectiveCFIDefCfaRegister |
| /// ::= .cfi_def_cfa_register register |
| bool GenericAsmParser::ParseDirectiveCFIDefCfaRegister(StringRef, |
| SMLoc DirectiveLoc) { |
| int64_t Register = 0; |
| if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc)) |
| return true; |
| |
| getStreamer().EmitCFIDefCfaRegister(Register); |
| return false; |
| } |
| |
| /// ParseDirectiveCFIOffset |
| /// ::= .cfi_offset register, offset |
| bool GenericAsmParser::ParseDirectiveCFIOffset(StringRef, SMLoc DirectiveLoc) { |
| int64_t Register = 0; |
| int64_t Offset = 0; |
| |
| if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc)) |
| return true; |
| |
| if (getLexer().isNot(AsmToken::Comma)) |
| return TokError("unexpected token in directive"); |
| Lex(); |
| |
| if (getParser().ParseAbsoluteExpression(Offset)) |
| return true; |
| |
| getStreamer().EmitCFIOffset(Register, Offset); |
| return false; |
| } |
| |
| /// ParseDirectiveCFIRelOffset |
| /// ::= .cfi_rel_offset register, offset |
| bool GenericAsmParser::ParseDirectiveCFIRelOffset(StringRef, |
| SMLoc DirectiveLoc) { |
| int64_t Register = 0; |
| |
| if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc)) |
| return true; |
| |
| if (getLexer().isNot(AsmToken::Comma)) |
| return TokError("unexpected token in directive"); |
| Lex(); |
| |
| int64_t Offset = 0; |
| if (getParser().ParseAbsoluteExpression(Offset)) |
| return true; |
| |
| getStreamer().EmitCFIRelOffset(Register, Offset); |
| return false; |
| } |
| |
| static bool isValidEncoding(int64_t Encoding) { |
| if (Encoding & ~0xff) |
| return false; |
| |
| if (Encoding == dwarf::DW_EH_PE_omit) |
| return true; |
| |
| const unsigned Format = Encoding & 0xf; |
| if (Format != dwarf::DW_EH_PE_absptr && Format != dwarf::DW_EH_PE_udata2 && |
| Format != dwarf::DW_EH_PE_udata4 && Format != dwarf::DW_EH_PE_udata8 && |
| Format != dwarf::DW_EH_PE_sdata2 && Format != dwarf::DW_EH_PE_sdata4 && |
| Format != dwarf::DW_EH_PE_sdata8 && Format != dwarf::DW_EH_PE_signed) |
| return false; |
| |
| const unsigned Application = Encoding & 0x70; |
| if (Application != dwarf::DW_EH_PE_absptr && |
| Application != dwarf::DW_EH_PE_pcrel) |
| return false; |
| |
| return true; |
| } |
| |
| /// ParseDirectiveCFIPersonalityOrLsda |
| /// ::= .cfi_personality encoding, [symbol_name] |
| /// ::= .cfi_lsda encoding, [symbol_name] |
| bool GenericAsmParser::ParseDirectiveCFIPersonalityOrLsda(StringRef IDVal, |
| SMLoc DirectiveLoc) { |
| int64_t Encoding = 0; |
| if (getParser().ParseAbsoluteExpression(Encoding)) |
| return true; |
| if (Encoding == dwarf::DW_EH_PE_omit) |
| return false; |
| |
| if (!isValidEncoding(Encoding)) |
| return TokError("unsupported encoding."); |
| |
| if (getLexer().isNot(AsmToken::Comma)) |
| return TokError("unexpected token in directive"); |
| Lex(); |
| |
| StringRef Name; |
| if (getParser().ParseIdentifier(Name)) |
| return TokError("expected identifier in directive"); |
| |
| MCSymbol *Sym = getContext().GetOrCreateSymbol(Name); |
| |
| if (IDVal == ".cfi_personality") |
| getStreamer().EmitCFIPersonality(Sym, Encoding); |
| else { |
| assert(IDVal == ".cfi_lsda"); |
| getStreamer().EmitCFILsda(Sym, Encoding); |
| } |
| return false; |
| } |
| |
| /// ParseDirectiveCFIRememberState |
| /// ::= .cfi_remember_state |
| bool GenericAsmParser::ParseDirectiveCFIRememberState(StringRef IDVal, |
| SMLoc DirectiveLoc) { |
| getStreamer().EmitCFIRememberState(); |
| return false; |
| } |
| |
| /// ParseDirectiveCFIRestoreState |
| /// ::= .cfi_remember_state |
| bool GenericAsmParser::ParseDirectiveCFIRestoreState(StringRef IDVal, |
| SMLoc DirectiveLoc) { |
| getStreamer().EmitCFIRestoreState(); |
| return false; |
| } |
| |
| /// ParseDirectiveCFISameValue |
| /// ::= .cfi_same_value register |
| bool GenericAsmParser::ParseDirectiveCFISameValue(StringRef IDVal, |
| SMLoc DirectiveLoc) { |
| int64_t Register = 0; |
| |
| if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc)) |
| return true; |
| |
| getStreamer().EmitCFISameValue(Register); |
| |
| return false; |
| } |
| |
| /// ParseDirectiveCFIRestore |
| /// ::= .cfi_restore register |
| bool GenericAsmParser::ParseDirectiveCFIRestore(StringRef IDVal, |
| SMLoc DirectiveLoc) { |
| int64_t Register = 0; |
| if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc)) |
| return true; |
| |
| getStreamer().EmitCFIRestore(Register); |
| |
| return false; |
| } |
| |
| /// ParseDirectiveCFIEscape |
| /// ::= .cfi_escape expression[,...] |
| bool GenericAsmParser::ParseDirectiveCFIEscape(StringRef IDVal, |
| SMLoc DirectiveLoc) { |
| std::string Values; |
| int64_t CurrValue; |
| if (getParser().ParseAbsoluteExpression(CurrValue)) |
| return true; |
| |
| Values.push_back((uint8_t)CurrValue); |
| |
| while (getLexer().is(AsmToken::Comma)) { |
| Lex(); |
| |
| if (getParser().ParseAbsoluteExpression(CurrValue)) |
| return true; |
| |
| Values.push_back((uint8_t)CurrValue); |
| } |
| |
| getStreamer().EmitCFIEscape(Values); |
| return false; |
| } |
| |
| /// ParseDirectiveMacrosOnOff |
| /// ::= .macros_on |
| /// ::= .macros_off |
| bool GenericAsmParser::ParseDirectiveMacrosOnOff(StringRef Directive, |
| SMLoc DirectiveLoc) { |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return Error(getLexer().getLoc(), |
| "unexpected token in '" + Directive + "' directive"); |
| |
| getParser().MacrosEnabled = Directive == ".macros_on"; |
| |
| return false; |
| } |
| |
| /// ParseDirectiveMacro |
| /// ::= .macro name [parameters] |
| bool GenericAsmParser::ParseDirectiveMacro(StringRef Directive, |
| SMLoc DirectiveLoc) { |
| StringRef Name; |
| if (getParser().ParseIdentifier(Name)) |
| return TokError("expected identifier in directive"); |
| |
| std::vector<StringRef> Parameters; |
| if (getLexer().isNot(AsmToken::EndOfStatement)) { |
| for(;;) { |
| StringRef Parameter; |
| if (getParser().ParseIdentifier(Parameter)) |
| return TokError("expected identifier in directive"); |
| Parameters.push_back(Parameter); |
| |
| if (getLexer().isNot(AsmToken::Comma)) |
| break; |
| Lex(); |
| } |
| } |
| |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in '.macro' directive"); |
| |
| // Eat the end of statement. |
| Lex(); |
| |
| AsmToken EndToken, StartToken = getTok(); |
| |
| // Lex the macro definition. |
| for (;;) { |
| // Check whether we have reached the end of the file. |
| if (getLexer().is(AsmToken::Eof)) |
| return Error(DirectiveLoc, "no matching '.endmacro' in definition"); |
| |
| // Otherwise, check whether we have reach the .endmacro. |
| if (getLexer().is(AsmToken::Identifier) && |
| (getTok().getIdentifier() == ".endm" || |
| getTok().getIdentifier() == ".endmacro")) { |
| EndToken = getTok(); |
| Lex(); |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in '" + EndToken.getIdentifier() + |
| "' directive"); |
| break; |
| } |
| |
| // Otherwise, scan til the end of the statement. |
| getParser().EatToEndOfStatement(); |
| } |
| |
| if (getParser().MacroMap.lookup(Name)) { |
| return Error(DirectiveLoc, "macro '" + Name + "' is already defined"); |
| } |
| |
| const char *BodyStart = StartToken.getLoc().getPointer(); |
| const char *BodyEnd = EndToken.getLoc().getPointer(); |
| StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart); |
| getParser().MacroMap[Name] = new Macro(Name, Body, Parameters); |
| return false; |
| } |
| |
| /// ParseDirectiveEndMacro |
| /// ::= .endm |
| /// ::= .endmacro |
| bool GenericAsmParser::ParseDirectiveEndMacro(StringRef Directive, |
| SMLoc DirectiveLoc) { |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in '" + Directive + "' directive"); |
| |
| // If we are inside a macro instantiation, terminate the current |
| // instantiation. |
| if (!getParser().ActiveMacros.empty()) { |
| getParser().HandleMacroExit(); |
| return false; |
| } |
| |
| // Otherwise, this .endmacro is a stray entry in the file; well formed |
| // .endmacro directives are handled during the macro definition parsing. |
| return TokError("unexpected '" + Directive + "' in file, " |
| "no current macro definition"); |
| } |
| |
| bool GenericAsmParser::ParseDirectiveLEB128(StringRef DirName, SMLoc) { |
| getParser().CheckForValidSection(); |
| |
| const MCExpr *Value; |
| |
| if (getParser().ParseExpression(Value)) |
| return true; |
| |
| if (getLexer().isNot(AsmToken::EndOfStatement)) |
| return TokError("unexpected token in directive"); |
| |
| if (DirName[1] == 's') |
| getStreamer().EmitSLEB128Value(Value); |
| else |
| getStreamer().EmitULEB128Value(Value); |
| |
| return false; |
| } |
| |
| |
| /// \brief Create an MCAsmParser instance. |
| MCAsmParser *llvm::createMCAsmParser(SourceMgr &SM, |
| MCContext &C, MCStreamer &Out, |
| const MCAsmInfo &MAI) { |
| return new AsmParser(SM, C, Out, MAI); |
| } |