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Diffstat (limited to 'contrib/llvm/lib/MC/MCParser/AsmParser.cpp')
| -rw-r--r-- | contrib/llvm/lib/MC/MCParser/AsmParser.cpp | 4987 |
1 files changed, 4987 insertions, 0 deletions
diff --git a/contrib/llvm/lib/MC/MCParser/AsmParser.cpp b/contrib/llvm/lib/MC/MCParser/AsmParser.cpp new file mode 100644 index 0000000..646cbb4 --- /dev/null +++ b/contrib/llvm/lib/MC/MCParser/AsmParser.cpp @@ -0,0 +1,4987 @@ +//===- 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/STLExtras.h" +#include "llvm/ADT/SmallString.h" +#include "llvm/ADT/StringMap.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/MCInstPrinter.h" +#include "llvm/MC/MCInstrInfo.h" +#include "llvm/MC/MCObjectFileInfo.h" +#include "llvm/MC/MCParser/AsmCond.h" +#include "llvm/MC/MCParser/AsmLexer.h" +#include "llvm/MC/MCParser/MCAsmParser.h" +#include "llvm/MC/MCParser/MCAsmParserUtils.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/MC/MCValue.h" +#include "llvm/Support/CommandLine.h" +#include "llvm/Support/ErrorHandling.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 <deque> +#include <set> +#include <string> +#include <vector> +using namespace llvm; + +MCAsmParserSemaCallback::~MCAsmParserSemaCallback() {} + +namespace { +/// \brief Helper types for tracking macro definitions. +typedef std::vector<AsmToken> MCAsmMacroArgument; +typedef std::vector<MCAsmMacroArgument> MCAsmMacroArguments; + +struct MCAsmMacroParameter { + StringRef Name; + MCAsmMacroArgument Value; + bool Required; + bool Vararg; + + MCAsmMacroParameter() : Required(false), Vararg(false) {} +}; + +typedef std::vector<MCAsmMacroParameter> MCAsmMacroParameters; + +struct MCAsmMacro { + StringRef Name; + StringRef Body; + MCAsmMacroParameters Parameters; + +public: + MCAsmMacro(StringRef N, StringRef B, MCAsmMacroParameters P) + : Name(N), Body(B), Parameters(std::move(P)) {} +}; + +/// \brief Helper class for storing information about an active macro +/// instantiation. +struct MacroInstantiation { + /// The location of the instantiation. + SMLoc InstantiationLoc; + + /// The buffer where parsing should resume upon instantiation completion. + int ExitBuffer; + + /// The location where parsing should resume upon instantiation completion. + SMLoc ExitLoc; + + /// The depth of TheCondStack at the start of the instantiation. + size_t CondStackDepth; + +public: + MacroInstantiation(SMLoc IL, int EB, SMLoc EL, size_t CondStackDepth); +}; + +struct ParseStatementInfo { + /// \brief The parsed operands from the last parsed statement. + SmallVector<std::unique_ptr<MCParsedAsmOperand>, 8> ParsedOperands; + + /// \brief The opcode from the last parsed instruction. + unsigned Opcode; + + /// \brief Was there an error parsing the inline assembly? + bool ParseError; + + SmallVectorImpl<AsmRewrite> *AsmRewrites; + + ParseStatementInfo() : Opcode(~0U), ParseError(false), AsmRewrites(nullptr) {} + ParseStatementInfo(SmallVectorImpl<AsmRewrite> *rewrites) + : Opcode(~0), ParseError(false), AsmRewrites(rewrites) {} +}; + +/// \brief The concrete assembly parser instance. +class AsmParser : public MCAsmParser { + AsmParser(const AsmParser &) = delete; + void operator=(const AsmParser &) = delete; +private: + AsmLexer Lexer; + MCContext &Ctx; + MCStreamer &Out; + const MCAsmInfo &MAI; + SourceMgr &SrcMgr; + SourceMgr::DiagHandlerTy SavedDiagHandler; + void *SavedDiagContext; + std::unique_ptr<MCAsmParserExtension> PlatformParser; + + /// This is the current buffer index we're lexing from as managed by the + /// SourceMgr object. + unsigned CurBuffer; + + AsmCond TheCondState; + std::vector<AsmCond> TheCondStack; + + /// \brief maps directive names to handler methods in parser + /// extensions. Extensions register themselves in this map by calling + /// addDirectiveHandler. + StringMap<ExtensionDirectiveHandler> ExtensionDirectiveMap; + + /// \brief Map of currently defined macros. + StringMap<MCAsmMacro> MacroMap; + + /// \brief Stack of active macro instantiations. + std::vector<MacroInstantiation*> ActiveMacros; + + /// \brief List of bodies of anonymous macros. + std::deque<MCAsmMacro> MacroLikeBodies; + + /// Boolean tracking whether macro substitution is enabled. + unsigned MacrosEnabledFlag : 1; + + /// \brief Keeps track of how many .macro's have been instantiated. + unsigned NumOfMacroInstantiations; + + /// 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; + unsigned CppHashBuf; + /// When generating dwarf for assembly source files we need to calculate the + /// logical line number based on the last parsed cpp hash file line comment + /// and current line. Since this is slow and messes up the SourceMgr's + /// cache we save the last info we queried with SrcMgr.FindLineNumber(). + SMLoc LastQueryIDLoc; + unsigned LastQueryBuffer; + unsigned LastQueryLine; + + /// AssemblerDialect. ~OU means unset value and use value provided by MAI. + unsigned AssemblerDialect; + + /// \brief is Darwin compatibility enabled? + bool IsDarwin; + + /// \brief Are we parsing ms-style inline assembly? + bool ParsingInlineAsm; + +public: + AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out, + const MCAsmInfo &MAI); + ~AsmParser() override; + + bool Run(bool NoInitialTextSection, bool NoFinalize = false) override; + + void addDirectiveHandler(StringRef Directive, + ExtensionDirectiveHandler Handler) override { + ExtensionDirectiveMap[Directive] = Handler; + } + + void addAliasForDirective(StringRef Directive, StringRef Alias) override { + DirectiveKindMap[Directive] = DirectiveKindMap[Alias]; + } + +public: + /// @name MCAsmParser Interface + /// { + + SourceMgr &getSourceManager() override { return SrcMgr; } + MCAsmLexer &getLexer() override { return Lexer; } + MCContext &getContext() override { return Ctx; } + MCStreamer &getStreamer() override { return Out; } + unsigned getAssemblerDialect() override { + if (AssemblerDialect == ~0U) + return MAI.getAssemblerDialect(); + else + return AssemblerDialect; + } + void setAssemblerDialect(unsigned i) override { + AssemblerDialect = i; + } + + void Note(SMLoc L, const Twine &Msg, + ArrayRef<SMRange> Ranges = None) override; + bool Warning(SMLoc L, const Twine &Msg, + ArrayRef<SMRange> Ranges = None) override; + bool Error(SMLoc L, const Twine &Msg, + ArrayRef<SMRange> Ranges = None) override; + + const AsmToken &Lex() override; + + void setParsingInlineAsm(bool V) override { ParsingInlineAsm = V; } + bool isParsingInlineAsm() override { return ParsingInlineAsm; } + + bool parseMSInlineAsm(void *AsmLoc, std::string &AsmString, + unsigned &NumOutputs, unsigned &NumInputs, + SmallVectorImpl<std::pair<void *,bool> > &OpDecls, + SmallVectorImpl<std::string> &Constraints, + SmallVectorImpl<std::string> &Clobbers, + const MCInstrInfo *MII, const MCInstPrinter *IP, + MCAsmParserSemaCallback &SI) override; + + bool parseExpression(const MCExpr *&Res); + bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc) override; + bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) override; + bool parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) override; + bool parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res, + SMLoc &EndLoc) override; + bool parseAbsoluteExpression(int64_t &Res) override; + + /// \brief Parse an identifier or string (as a quoted identifier) + /// and set \p Res to the identifier contents. + bool parseIdentifier(StringRef &Res) override; + void eatToEndOfStatement() override; + + void checkForValidSection() override; + /// } + +private: + + bool parseStatement(ParseStatementInfo &Info, + MCAsmParserSemaCallback *SI); + void eatToEndOfLine(); + bool parseCppHashLineFilenameComment(SMLoc L); + + void checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, StringRef Body, + ArrayRef<MCAsmMacroParameter> Parameters); + bool expandMacro(raw_svector_ostream &OS, StringRef Body, + ArrayRef<MCAsmMacroParameter> Parameters, + ArrayRef<MCAsmMacroArgument> A, bool EnableAtPseudoVariable, + SMLoc L); + + /// \brief Are macros enabled in the parser? + bool areMacrosEnabled() {return MacrosEnabledFlag;} + + /// \brief Control a flag in the parser that enables or disables macros. + void setMacrosEnabled(bool Flag) {MacrosEnabledFlag = Flag;} + + /// \brief Lookup a previously defined macro. + /// \param Name Macro name. + /// \returns Pointer to macro. NULL if no such macro was defined. + const MCAsmMacro* lookupMacro(StringRef Name); + + /// \brief Define a new macro with the given name and information. + void defineMacro(StringRef Name, MCAsmMacro Macro); + + /// \brief Undefine a macro. If no such macro was defined, it's a no-op. + void undefineMacro(StringRef Name); + + /// \brief Are we inside a macro instantiation? + bool isInsideMacroInstantiation() {return !ActiveMacros.empty();} + + /// \brief Handle entry to macro instantiation. + /// + /// \param M The macro. + /// \param NameLoc Instantiation location. + bool handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc); + + /// \brief Handle exit from macro instantiation. + void handleMacroExit(); + + /// \brief Extract AsmTokens for a macro argument. + bool parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg); + + /// \brief Parse all macro arguments for a given macro. + bool parseMacroArguments(const MCAsmMacro *M, MCAsmMacroArguments &A); + + void printMacroInstantiations(); + void printMessage(SMLoc Loc, SourceMgr::DiagKind Kind, const Twine &Msg, + ArrayRef<SMRange> Ranges = None) const { + SrcMgr.PrintMessage(Loc, Kind, Msg, Ranges); + } + static void DiagHandler(const SMDiagnostic &Diag, void *Context); + + /// \brief Enter the specified file. This returns true on failure. + bool enterIncludeFile(const std::string &Filename); + + /// \brief 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 \p Loc. The + /// current token is not set; clients should ensure Lex() is called + /// subsequently. + /// + /// \param InBuffer If not 0, should be the known buffer id that contains the + /// location. + void jumpToLoc(SMLoc Loc, unsigned InBuffer = 0); + + /// \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() override; + + /// \brief Parse until the end of a statement or a comma is encountered, + /// return the contents from the current token up to the end or comma. + StringRef parseStringToComma(); + + bool parseAssignment(StringRef Name, bool allow_redef, + bool NoDeadStrip = false); + + unsigned getBinOpPrecedence(AsmToken::TokenKind K, + MCBinaryExpr::Opcode &Kind); + + bool parseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc); + bool parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc); + bool parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc); + + bool parseRegisterOrRegisterNumber(int64_t &Register, SMLoc DirectiveLoc); + + // Generic (target and platform independent) directive parsing. + enum DirectiveKind { + DK_NO_DIRECTIVE, // Placeholder + DK_SET, DK_EQU, DK_EQUIV, DK_ASCII, DK_ASCIZ, DK_STRING, DK_BYTE, DK_SHORT, + DK_RELOC, + DK_VALUE, DK_2BYTE, DK_LONG, DK_INT, DK_4BYTE, DK_QUAD, DK_8BYTE, DK_OCTA, + DK_SINGLE, DK_FLOAT, DK_DOUBLE, DK_ALIGN, DK_ALIGN32, DK_BALIGN, DK_BALIGNW, + DK_BALIGNL, DK_P2ALIGN, DK_P2ALIGNW, DK_P2ALIGNL, DK_ORG, DK_FILL, DK_ENDR, + DK_BUNDLE_ALIGN_MODE, DK_BUNDLE_LOCK, DK_BUNDLE_UNLOCK, + DK_ZERO, DK_EXTERN, DK_GLOBL, DK_GLOBAL, + DK_LAZY_REFERENCE, DK_NO_DEAD_STRIP, DK_SYMBOL_RESOLVER, DK_PRIVATE_EXTERN, + DK_REFERENCE, DK_WEAK_DEFINITION, DK_WEAK_REFERENCE, + DK_WEAK_DEF_CAN_BE_HIDDEN, DK_COMM, DK_COMMON, DK_LCOMM, DK_ABORT, + DK_INCLUDE, DK_INCBIN, DK_CODE16, DK_CODE16GCC, DK_REPT, DK_IRP, DK_IRPC, + DK_IF, DK_IFEQ, DK_IFGE, DK_IFGT, DK_IFLE, DK_IFLT, DK_IFNE, DK_IFB, + DK_IFNB, DK_IFC, DK_IFEQS, DK_IFNC, DK_IFNES, DK_IFDEF, DK_IFNDEF, + DK_IFNOTDEF, DK_ELSEIF, DK_ELSE, DK_ENDIF, + DK_SPACE, DK_SKIP, DK_FILE, DK_LINE, DK_LOC, DK_STABS, + DK_CFI_SECTIONS, DK_CFI_STARTPROC, DK_CFI_ENDPROC, DK_CFI_DEF_CFA, + DK_CFI_DEF_CFA_OFFSET, DK_CFI_ADJUST_CFA_OFFSET, DK_CFI_DEF_CFA_REGISTER, + DK_CFI_OFFSET, DK_CFI_REL_OFFSET, DK_CFI_PERSONALITY, DK_CFI_LSDA, + DK_CFI_REMEMBER_STATE, DK_CFI_RESTORE_STATE, DK_CFI_SAME_VALUE, + DK_CFI_RESTORE, DK_CFI_ESCAPE, DK_CFI_SIGNAL_FRAME, DK_CFI_UNDEFINED, + DK_CFI_REGISTER, DK_CFI_WINDOW_SAVE, + DK_MACROS_ON, DK_MACROS_OFF, + DK_MACRO, DK_EXITM, DK_ENDM, DK_ENDMACRO, DK_PURGEM, + DK_SLEB128, DK_ULEB128, + DK_ERR, DK_ERROR, DK_WARNING, + DK_END + }; + + /// \brief Maps directive name --> DirectiveKind enum, for + /// directives parsed by this class. + StringMap<DirectiveKind> DirectiveKindMap; + + // ".ascii", ".asciz", ".string" + bool parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated); + bool parseDirectiveReloc(SMLoc DirectiveLoc); // ".reloc" + bool parseDirectiveValue(unsigned Size); // ".byte", ".long", ... + bool parseDirectiveOctaValue(); // ".octa" + bool parseDirectiveRealValue(const fltSemantics &); // ".single", ... + bool parseDirectiveFill(); // ".fill" + bool parseDirectiveZero(); // ".zero" + // ".set", ".equ", ".equiv" + bool parseDirectiveSet(StringRef IDVal, bool allow_redef); + bool parseDirectiveOrg(); // ".org" + // ".align{,32}", ".p2align{,w,l}" + bool parseDirectiveAlign(bool IsPow2, unsigned ValueSize); + + // ".file", ".line", ".loc", ".stabs" + bool parseDirectiveFile(SMLoc DirectiveLoc); + bool parseDirectiveLine(); + bool parseDirectiveLoc(); + bool parseDirectiveStabs(); + + // .cfi directives + bool parseDirectiveCFIRegister(SMLoc DirectiveLoc); + bool parseDirectiveCFIWindowSave(); + bool parseDirectiveCFISections(); + bool parseDirectiveCFIStartProc(); + bool parseDirectiveCFIEndProc(); + bool parseDirectiveCFIDefCfaOffset(); + bool parseDirectiveCFIDefCfa(SMLoc DirectiveLoc); + bool parseDirectiveCFIAdjustCfaOffset(); + bool parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc); + bool parseDirectiveCFIOffset(SMLoc DirectiveLoc); + bool parseDirectiveCFIRelOffset(SMLoc DirectiveLoc); + bool parseDirectiveCFIPersonalityOrLsda(bool IsPersonality); + bool parseDirectiveCFIRememberState(); + bool parseDirectiveCFIRestoreState(); + bool parseDirectiveCFISameValue(SMLoc DirectiveLoc); + bool parseDirectiveCFIRestore(SMLoc DirectiveLoc); + bool parseDirectiveCFIEscape(); + bool parseDirectiveCFISignalFrame(); + bool parseDirectiveCFIUndefined(SMLoc DirectiveLoc); + + // macro directives + bool parseDirectivePurgeMacro(SMLoc DirectiveLoc); + bool parseDirectiveExitMacro(StringRef Directive); + bool parseDirectiveEndMacro(StringRef Directive); + bool parseDirectiveMacro(SMLoc DirectiveLoc); + bool parseDirectiveMacrosOnOff(StringRef Directive); + + // ".bundle_align_mode" + bool parseDirectiveBundleAlignMode(); + // ".bundle_lock" + bool parseDirectiveBundleLock(); + // ".bundle_unlock" + bool parseDirectiveBundleUnlock(); + + // ".space", ".skip" + bool parseDirectiveSpace(StringRef IDVal); + + // .sleb128 (Signed=true) and .uleb128 (Signed=false) + bool parseDirectiveLEB128(bool Signed); + + /// \brief 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" + + // ".if", ".ifeq", ".ifge", ".ifgt" , ".ifle", ".iflt" or ".ifne" + bool parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind); + // ".ifb" or ".ifnb", depending on ExpectBlank. + bool parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank); + // ".ifc" or ".ifnc", depending on ExpectEqual. + bool parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual); + // ".ifeqs" or ".ifnes", depending on ExpectEqual. + bool parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual); + // ".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 + bool parseEscapedString(std::string &Data) override; + + const MCExpr *applyModifierToExpr(const MCExpr *E, + MCSymbolRefExpr::VariantKind Variant); + + // Macro-like directives + MCAsmMacro *parseMacroLikeBody(SMLoc DirectiveLoc); + void instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc, + raw_svector_ostream &OS); + bool parseDirectiveRept(SMLoc DirectiveLoc, StringRef Directive); + bool parseDirectiveIrp(SMLoc DirectiveLoc); // ".irp" + bool parseDirectiveIrpc(SMLoc DirectiveLoc); // ".irpc" + bool parseDirectiveEndr(SMLoc DirectiveLoc); // ".endr" + + // "_emit" or "__emit" + bool parseDirectiveMSEmit(SMLoc DirectiveLoc, ParseStatementInfo &Info, + size_t Len); + + // "align" + bool parseDirectiveMSAlign(SMLoc DirectiveLoc, ParseStatementInfo &Info); + + // "end" + bool parseDirectiveEnd(SMLoc DirectiveLoc); + + // ".err" or ".error" + bool parseDirectiveError(SMLoc DirectiveLoc, bool WithMessage); + + // ".warning" + bool parseDirectiveWarning(SMLoc DirectiveLoc); + + void initializeDirectiveKindMap(); +}; +} + +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), + PlatformParser(nullptr), CurBuffer(SM.getMainFileID()), + MacrosEnabledFlag(true), HadError(false), CppHashLineNumber(0), + AssemblerDialect(~0U), IsDarwin(false), ParsingInlineAsm(false) { + // 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)->getBuffer()); + + // Initialize the platform / file format parser. + switch (Ctx.getObjectFileInfo()->getObjectFileType()) { + case MCObjectFileInfo::IsCOFF: + PlatformParser.reset(createCOFFAsmParser()); + break; + case MCObjectFileInfo::IsMachO: + PlatformParser.reset(createDarwinAsmParser()); + IsDarwin = true; + break; + case MCObjectFileInfo::IsELF: + PlatformParser.reset(createELFAsmParser()); + break; + } + + PlatformParser->Initialize(*this); + initializeDirectiveKindMap(); + + NumOfMacroInstantiations = 0; +} + +AsmParser::~AsmParser() { + assert((HadError || ActiveMacros.empty()) && + "Unexpected active macro instantiation!"); +} + +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"); +} + +void AsmParser::Note(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) { + printMessage(L, SourceMgr::DK_Note, Msg, Ranges); + printMacroInstantiations(); +} + +bool AsmParser::Warning(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) { + if(getTargetParser().getTargetOptions().MCNoWarn) + return false; + if (getTargetParser().getTargetOptions().MCFatalWarnings) + 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; + unsigned NewBuf = + SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile); + if (!NewBuf) + return true; + + CurBuffer = NewBuf; + Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); + return false; +} + +/// Process the specified .incbin file by searching for it in the include paths +/// then just emitting the byte contents of the file to the streamer. This +/// returns true on failure. +bool AsmParser::processIncbinFile(const std::string &Filename) { + std::string IncludedFile; + unsigned NewBuf = + SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile); + if (!NewBuf) + return true; + + // Pick up the bytes from the file and emit them. + getStreamer().EmitBytes(SrcMgr.getMemoryBuffer(NewBuf)->getBuffer()); + return false; +} + +void AsmParser::jumpToLoc(SMLoc Loc, unsigned InBuffer) { + CurBuffer = InBuffer ? InBuffer : SrcMgr.FindBufferContainingLoc(Loc); + Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer(), + 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(false); + + // 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()) { + MCSection *Sec = getStreamer().getCurrentSection().first; + if (!Sec->getBeginSymbol()) { + MCSymbol *SectionStartSym = getContext().createTempSymbol(); + getStreamer().EmitLabel(SectionStartSym); + Sec->setBeginSymbol(SectionStartSym); + } + bool InsertResult = getContext().addGenDwarfSection(Sec); + assert(InsertResult && ".text section should not have debug info yet"); + (void)InsertResult; + getContext().setGenDwarfFileNumber(getStreamer().EmitDwarfFileDirective( + 0, StringRef(), getContext().getMainFileName())); + } + + // While we have input, parse each statement. + while (Lexer.isNot(AsmToken::Eof)) { + ParseStatementInfo Info; + if (!parseStatement(Info, nullptr)) + 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 auto &LineTables = getContext().getMCDwarfLineTables(); + if (!LineTables.empty()) { + unsigned Index = 0; + for (const auto &File : LineTables.begin()->second.getMCDwarfFiles()) { + if (File.Name.empty() && Index != 0) + TokError("unassigned file number: " + Twine(Index) + + " for .file directives"); + ++Index; + } + } + + // 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()) { + for (const auto &TableEntry : getContext().getSymbols()) { + MCSymbol *Sym = TableEntry.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. + return Error(getLexer().getLoc(), "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 || getContext().hadError(); +} + +void AsmParser::checkForValidSection() { + if (!ParsingInlineAsm && !getStreamer().getCurrentSection().first) { + TokError("expected section directive before assembly directive"); + Out.InitSections(false); + } +} + +/// \brief 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); +} + +StringRef AsmParser::parseStringToComma() { + const char *Start = getTok().getLoc().getPointer(); + + while (Lexer.isNot(AsmToken::EndOfStatement) && + Lexer.isNot(AsmToken::Comma) && Lexer.isNot(AsmToken::Eof)) + Lex(); + + const char *End = getTok().getLoc().getPointer(); + return StringRef(Start, End - Start); +} + +/// \brief 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.getTok().getEndLoc(); + Lex(); + return false; +} + +/// \brief 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.getTok().getEndLoc(); + Lex(); + return false; +} + +/// \brief Parse a primary expression and return it. +/// primaryexpr ::= (parenexpr +/// primaryexpr ::= symbol +/// primaryexpr ::= number +/// primaryexpr ::= '.' +/// primaryexpr ::= ~,+,- primaryexpr +bool AsmParser::parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) { + SMLoc FirstTokenLoc = getLexer().getLoc(); + AsmToken::TokenKind FirstTokenKind = Lexer.getKind(); + switch (FirstTokenKind) { + 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::At: + case AsmToken::String: + case AsmToken::Identifier: { + StringRef Identifier; + if (parseIdentifier(Identifier)) { + if (FirstTokenKind == AsmToken::Dollar) { + if (Lexer.getMAI().getDollarIsPC()) { + // 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 = FirstTokenLoc; + return false; + } + return Error(FirstTokenLoc, "invalid token in expression"); + } + } + // Parse symbol variant + std::pair<StringRef, StringRef> Split; + if (!MAI.useParensForSymbolVariant()) { + if (FirstTokenKind == AsmToken::String) { + if (Lexer.is(AsmToken::At)) { + Lexer.Lex(); // eat @ + SMLoc AtLoc = getLexer().getLoc(); + StringRef VName; + if (parseIdentifier(VName)) + return Error(AtLoc, "expected symbol variant after '@'"); + + Split = std::make_pair(Identifier, VName); + } + } else { + Split = Identifier.split('@'); + } + } else if (Lexer.is(AsmToken::LParen)) { + Lexer.Lex(); // eat ( + StringRef VName; + parseIdentifier(VName); + if (Lexer.isNot(AsmToken::RParen)) { + return Error(Lexer.getTok().getLoc(), + "unexpected token in variant, expected ')'"); + } + Lexer.Lex(); // eat ) + Split = std::make_pair(Identifier, VName); + } + + EndLoc = SMLoc::getFromPointer(Identifier.end()); + + // This is a symbol reference. + StringRef SymbolName = Identifier; + MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None; + + // Lookup the symbol variant if used. + if (Split.second.size()) { + Variant = MCSymbolRefExpr::getVariantKindForName(Split.second); + if (Variant != MCSymbolRefExpr::VK_Invalid) { + SymbolName = Split.first; + } else if (MAI.doesAllowAtInName() && !MAI.useParensForSymbolVariant()) { + Variant = MCSymbolRefExpr::VK_None; + } else { + return Error(SMLoc::getFromPointer(Split.second.begin()), + "invalid variant '" + Split.second + "'"); + } + } + + MCSymbol *Sym = getContext().getOrCreateSymbol(SymbolName); + + // 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(/*SetUsed*/ false))) { + if (Variant) + return Error(EndLoc, "unexpected modifier on variable reference"); + + Res = Sym->getVariableValue(/*SetUsed*/ false); + return false; + } + + // Otherwise create a symbol ref. + Res = MCSymbolRefExpr::create(Sym, Variant, getContext()); + return false; + } + case AsmToken::BigNum: + return TokError("literal value out of range for directive"); + case AsmToken::Integer: { + SMLoc Loc = getTok().getLoc(); + int64_t IntVal = getTok().getIntVal(); + Res = MCConstantExpr::create(IntVal, getContext()); + EndLoc = Lexer.getTok().getEndLoc(); + Lex(); // Eat token. + // Look for 'b' or 'f' following an Integer as a directional label + if (Lexer.getKind() == AsmToken::Identifier) { + StringRef IDVal = getTok().getString(); + // Lookup the symbol variant if used. + std::pair<StringRef, StringRef> Split = IDVal.split('@'); + MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None; + if (Split.first.size() != IDVal.size()) { + Variant = MCSymbolRefExpr::getVariantKindForName(Split.second); + if (Variant == MCSymbolRefExpr::VK_Invalid) + return TokError("invalid variant '" + Split.second + "'"); + IDVal = Split.first; + } + if (IDVal == "f" || IDVal == "b") { + MCSymbol *Sym = + Ctx.getDirectionalLocalSymbol(IntVal, IDVal == "b"); + Res = MCSymbolRefExpr::create(Sym, Variant, getContext()); + if (IDVal == "b" && Sym->isUndefined()) + return Error(Loc, "invalid reference to undefined symbol"); + EndLoc = Lexer.getTok().getEndLoc(); + 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()); + EndLoc = Lexer.getTok().getEndLoc(); + 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.getTok().getEndLoc(); + 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) { + // Ask the target implementation about this expression first. + const MCExpr *NewE = getTargetParser().applyModifierToExpr(E, Variant, Ctx); + if (NewE) + return NewE; + // 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 nullptr; + + 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 nullptr; + 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 nullptr; + + if (!LHS) + LHS = BE->getLHS(); + if (!RHS) + RHS = BE->getRHS(); + + return MCBinaryExpr::create(BE->getOpcode(), LHS, RHS, getContext()); + } + } + + llvm_unreachable("Invalid expression kind!"); +} + +/// \brief 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 = nullptr; + 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)"); + } + + 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 = nullptr; + return parseParenExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc); +} + +bool AsmParser::parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res, + SMLoc &EndLoc) { + if (parseParenExpr(Res, EndLoc)) + return true; + + for (; ParenDepth > 0; --ParenDepth) { + if (parseBinOpRHS(1, Res, EndLoc)) + return true; + + // We don't Lex() the last RParen. + // This is the same behavior as parseParenExpression(). + if (ParenDepth - 1 > 0) { + if (Lexer.isNot(AsmToken::RParen)) + return TokError("expected ')' in parentheses expression"); + EndLoc = Lexer.getTok().getEndLoc(); + Lex(); + } + } + return false; +} + +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 getDarwinBinOpPrecedence(AsmToken::TokenKind K, + MCBinaryExpr::Opcode &Kind, + bool ShouldUseLogicalShr) { + 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 = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr; + 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; + } +} + +static unsigned getGNUBinOpPrecedence(AsmToken::TokenKind K, + MCBinaryExpr::Opcode &Kind, + bool ShouldUseLogicalShr) { + switch (K) { + default: + return 0; // not a binop. + + // Lowest Precedence: &&, || + case AsmToken::AmpAmp: + Kind = MCBinaryExpr::LAnd; + return 2; + case AsmToken::PipePipe: + Kind = MCBinaryExpr::LOr; + return 1; + + // Low 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; + + // Low Intermediate Precedence: +, - + case AsmToken::Plus: + Kind = MCBinaryExpr::Add; + return 4; + case AsmToken::Minus: + Kind = MCBinaryExpr::Sub; + return 4; + + // High Intermediate Precedence: |, &, ^ + // + // FIXME: gas seems to support '!' as an infix operator? + case AsmToken::Pipe: + Kind = MCBinaryExpr::Or; + return 5; + case AsmToken::Caret: + Kind = MCBinaryExpr::Xor; + return 5; + case AsmToken::Amp: + Kind = MCBinaryExpr::And; + 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; + case AsmToken::LessLess: + Kind = MCBinaryExpr::Shl; + return 6; + case AsmToken::GreaterGreater: + Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr; + return 6; + } +} + +unsigned AsmParser::getBinOpPrecedence(AsmToken::TokenKind K, + MCBinaryExpr::Opcode &Kind) { + bool ShouldUseLogicalShr = MAI.shouldUseLogicalShr(); + return IsDarwin ? getDarwinBinOpPrecedence(K, Kind, ShouldUseLogicalShr) + : getGNUBinOpPrecedence(K, Kind, ShouldUseLogicalShr); +} + +/// \brief 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 && parseBinOpRHS(TokPrec + 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(ParseStatementInfo &Info, + MCAsmParserSemaCallback *SI) { + 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 (Lexer.is(AsmToken::LCurly)) { + // Treat '{' as a valid identifier in this context. + Lex(); + IDVal = "{"; + + } else if (Lexer.is(AsmToken::RCurly)) { + // 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. + StringMap<DirectiveKind>::const_iterator DirKindIt = + DirectiveKindMap.find(IDVal); + DirectiveKind DirKind = (DirKindIt == DirectiveKindMap.end()) + ? DK_NO_DIRECTIVE + : DirKindIt->getValue(); + switch (DirKind) { + default: + break; + case DK_IF: + case DK_IFEQ: + case DK_IFGE: + case DK_IFGT: + case DK_IFLE: + case DK_IFLT: + case DK_IFNE: + return parseDirectiveIf(IDLoc, DirKind); + case DK_IFB: + return parseDirectiveIfb(IDLoc, true); + case DK_IFNB: + return parseDirectiveIfb(IDLoc, false); + case DK_IFC: + return parseDirectiveIfc(IDLoc, true); + case DK_IFEQS: + return parseDirectiveIfeqs(IDLoc, true); + case DK_IFNC: + return parseDirectiveIfc(IDLoc, false); + case DK_IFNES: + return parseDirectiveIfeqs(IDLoc, false); + case DK_IFDEF: + return parseDirectiveIfdef(IDLoc, true); + case DK_IFNDEF: + case DK_IFNOTDEF: + return parseDirectiveIfdef(IDLoc, false); + case DK_ELSEIF: + return parseDirectiveElseIf(IDLoc); + case DK_ELSE: + return parseDirectiveElse(IDLoc); + case DK_ENDIF: + return parseDirectiveEndIf(IDLoc); + } + + // Ignore the statement if in the middle of inactive conditional + // (e.g. ".if 0"). + if (TheCondState.Ignore) { + eatToEndOfStatement(); + return false; + } + + // FIXME: Recurse on local labels? + + // See what kind of statement we have. + switch (Lexer.getKind()) { + case AsmToken::Colon: { + if (!getTargetParser().isLabel(ID)) + break; + 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) { + if (ParsingInlineAsm && SI) { + StringRef RewrittenLabel = + SI->LookupInlineAsmLabel(IDVal, getSourceManager(), IDLoc, true); + assert(RewrittenLabel.size() && + "We should have an internal name here."); + Info.AsmRewrites->emplace_back(AOK_Label, IDLoc, IDVal.size(), + RewrittenLabel); + IDVal = RewrittenLabel; + } + Sym = getContext().getOrCreateSymbol(IDVal); + } else + Sym = Ctx.createDirectionalLocalSymbol(LocalLabelVal); + + Sym->redefineIfPossible(); + + if (!Sym->isUndefined() || Sym->isVariable()) + return Error(IDLoc, "invalid symbol redefinition"); + + // Emit the label. + if (!ParsingInlineAsm) + Out.EmitLabel(Sym); + + // If we are generating dwarf for assembly source files then gather the + // info to make a dwarf label entry for this label if needed. + if (getContext().getGenDwarfForAssembly()) + MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(), + IDLoc); + + getTargetParser().onLabelParsed(Sym); + + // 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 false; + } + + case AsmToken::Equal: + if (!getTargetParser().equalIsAsmAssignment()) + break; + // 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 (areMacrosEnabled()) + if (const MCAsmMacro *M = lookupMacro(IDVal)) { + return handleMacroEntry(M, IDLoc); + } + + // Otherwise, we have a normal instruction or directive. + + // Directives start with "." + if (IDVal[0] == '.' && IDVal != ".") { + // There are several entities interested in parsing directives: + // + // 1. The target-specific assembly parser. Some directives are target + // specific or may potentially behave differently on certain targets. + // 2. Asm parser extensions. For example, platform-specific parsers + // (like the ELF parser) register themselves as extensions. + // 3. The generic directive parser implemented by this class. These are + // all the directives that behave in a target and platform independent + // manner, or at least have a default behavior that's shared between + // all targets and platforms. + + // First query the target-specific parser. It will return 'true' if it + // isn't interested in this directive. + if (!getTargetParser().ParseDirective(ID)) + return false; + + // Next, check the extension directive map to see if any extension has + // registered itself to parse this directive. + std::pair<MCAsmParserExtension *, DirectiveHandler> Handler = + ExtensionDirectiveMap.lookup(IDVal); + if (Handler.first) + return (*Handler.second)(Handler.first, IDVal, IDLoc); + + // Finally, if no one else is interested in this directive, it must be + // generic and familiar to this class. + switch (DirKind) { + default: + break; + case DK_SET: + case DK_EQU: + return parseDirectiveSet(IDVal, true); + case DK_EQUIV: + return parseDirectiveSet(IDVal, false); + case DK_ASCII: + return parseDirectiveAscii(IDVal, false); + case DK_ASCIZ: + case DK_STRING: + return parseDirectiveAscii(IDVal, true); + case DK_BYTE: + return parseDirectiveValue(1); + case DK_SHORT: + case DK_VALUE: + case DK_2BYTE: + return parseDirectiveValue(2); + case DK_LONG: + case DK_INT: + case DK_4BYTE: + return parseDirectiveValue(4); + case DK_QUAD: + case DK_8BYTE: + return parseDirectiveValue(8); + case DK_OCTA: + return parseDirectiveOctaValue(); + case DK_SINGLE: + case DK_FLOAT: + return parseDirectiveRealValue(APFloat::IEEEsingle); + case DK_DOUBLE: + return parseDirectiveRealValue(APFloat::IEEEdouble); + case DK_ALIGN: { + bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes(); + return parseDirectiveAlign(IsPow2, /*ExprSize=*/1); + } + case DK_ALIGN32: { + bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes(); + return parseDirectiveAlign(IsPow2, /*ExprSize=*/4); + } + case DK_BALIGN: + return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1); + case DK_BALIGNW: + return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2); + case DK_BALIGNL: + return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4); + case DK_P2ALIGN: + return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1); + case DK_P2ALIGNW: + return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2); + case DK_P2ALIGNL: + return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4); + case DK_ORG: + return parseDirectiveOrg(); + case DK_FILL: + return parseDirectiveFill(); + case DK_ZERO: + return parseDirectiveZero(); + case DK_EXTERN: + eatToEndOfStatement(); // .extern is the default, ignore it. + return false; + case DK_GLOBL: + case DK_GLOBAL: + return parseDirectiveSymbolAttribute(MCSA_Global); + case DK_LAZY_REFERENCE: + return parseDirectiveSymbolAttribute(MCSA_LazyReference); + case DK_NO_DEAD_STRIP: + return parseDirectiveSymbolAttribute(MCSA_NoDeadStrip); + case DK_SYMBOL_RESOLVER: + return parseDirectiveSymbolAttribute(MCSA_SymbolResolver); + case DK_PRIVATE_EXTERN: + return parseDirectiveSymbolAttribute(MCSA_PrivateExtern); + case DK_REFERENCE: + return parseDirectiveSymbolAttribute(MCSA_Reference); + case DK_WEAK_DEFINITION: + return parseDirectiveSymbolAttribute(MCSA_WeakDefinition); + case DK_WEAK_REFERENCE: + return parseDirectiveSymbolAttribute(MCSA_WeakReference); + case DK_WEAK_DEF_CAN_BE_HIDDEN: + return parseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate); + case DK_COMM: + case DK_COMMON: + return parseDirectiveComm(/*IsLocal=*/false); + case DK_LCOMM: + return parseDirectiveComm(/*IsLocal=*/true); + case DK_ABORT: + return parseDirectiveAbort(); + case DK_INCLUDE: + return parseDirectiveInclude(); + case DK_INCBIN: + return parseDirectiveIncbin(); + case DK_CODE16: + case DK_CODE16GCC: + return TokError(Twine(IDVal) + " not supported yet"); + case DK_REPT: + return parseDirectiveRept(IDLoc, IDVal); + case DK_IRP: + return parseDirectiveIrp(IDLoc); + case DK_IRPC: + return parseDirectiveIrpc(IDLoc); + case DK_ENDR: + return parseDirectiveEndr(IDLoc); + case DK_BUNDLE_ALIGN_MODE: + return parseDirectiveBundleAlignMode(); + case DK_BUNDLE_LOCK: + return parseDirectiveBundleLock(); + case DK_BUNDLE_UNLOCK: + return parseDirectiveBundleUnlock(); + case DK_SLEB128: + return parseDirectiveLEB128(true); + case DK_ULEB128: + return parseDirectiveLEB128(false); + case DK_SPACE: + case DK_SKIP: + return parseDirectiveSpace(IDVal); + case DK_FILE: + return parseDirectiveFile(IDLoc); + case DK_LINE: + return parseDirectiveLine(); + case DK_LOC: + return parseDirectiveLoc(); + case DK_STABS: + return parseDirectiveStabs(); + case DK_CFI_SECTIONS: + return parseDirectiveCFISections(); + case DK_CFI_STARTPROC: + return parseDirectiveCFIStartProc(); + case DK_CFI_ENDPROC: + return parseDirectiveCFIEndProc(); + case DK_CFI_DEF_CFA: + return parseDirectiveCFIDefCfa(IDLoc); + case DK_CFI_DEF_CFA_OFFSET: + return parseDirectiveCFIDefCfaOffset(); + case DK_CFI_ADJUST_CFA_OFFSET: + return parseDirectiveCFIAdjustCfaOffset(); + case DK_CFI_DEF_CFA_REGISTER: + return parseDirectiveCFIDefCfaRegister(IDLoc); + case DK_CFI_OFFSET: + return parseDirectiveCFIOffset(IDLoc); + case DK_CFI_REL_OFFSET: + return parseDirectiveCFIRelOffset(IDLoc); + case DK_CFI_PERSONALITY: + return parseDirectiveCFIPersonalityOrLsda(true); + case DK_CFI_LSDA: + return parseDirectiveCFIPersonalityOrLsda(false); + case DK_CFI_REMEMBER_STATE: + return parseDirectiveCFIRememberState(); + case DK_CFI_RESTORE_STATE: + return parseDirectiveCFIRestoreState(); + case DK_CFI_SAME_VALUE: + return parseDirectiveCFISameValue(IDLoc); + case DK_CFI_RESTORE: + return parseDirectiveCFIRestore(IDLoc); + case DK_CFI_ESCAPE: + return parseDirectiveCFIEscape(); + case DK_CFI_SIGNAL_FRAME: + return parseDirectiveCFISignalFrame(); + case DK_CFI_UNDEFINED: + return parseDirectiveCFIUndefined(IDLoc); + case DK_CFI_REGISTER: + return parseDirectiveCFIRegister(IDLoc); + case DK_CFI_WINDOW_SAVE: + return parseDirectiveCFIWindowSave(); + case DK_MACROS_ON: + case DK_MACROS_OFF: + return parseDirectiveMacrosOnOff(IDVal); + case DK_MACRO: + return parseDirectiveMacro(IDLoc); + case DK_EXITM: + return parseDirectiveExitMacro(IDVal); + case DK_ENDM: + case DK_ENDMACRO: + return parseDirectiveEndMacro(IDVal); + case DK_PURGEM: + return parseDirectivePurgeMacro(IDLoc); + case DK_END: + return parseDirectiveEnd(IDLoc); + case DK_ERR: + return parseDirectiveError(IDLoc, false); + case DK_ERROR: + return parseDirectiveError(IDLoc, true); + case DK_WARNING: + return parseDirectiveWarning(IDLoc); + case DK_RELOC: + return parseDirectiveReloc(IDLoc); + } + + return Error(IDLoc, "unknown directive"); + } + + // __asm _emit or __asm __emit + if (ParsingInlineAsm && (IDVal == "_emit" || IDVal == "__emit" || + IDVal == "_EMIT" || IDVal == "__EMIT")) + return parseDirectiveMSEmit(IDLoc, Info, IDVal.size()); + + // __asm align + if (ParsingInlineAsm && (IDVal == "align" || IDVal == "ALIGN")) + return parseDirectiveMSAlign(IDLoc, Info); + + if (ParsingInlineAsm && (IDVal == "even")) + Info.AsmRewrites->emplace_back(AOK_EVEN, IDLoc, 4); + checkForValidSection(); + + // Canonicalize the opcode to lower case. + std::string OpcodeStr = IDVal.lower(); + ParseInstructionInfo IInfo(Info.AsmRewrites); + bool HadError = getTargetParser().ParseInstruction(IInfo, OpcodeStr, ID, + Info.ParsedOperands); + Info.ParseError = HadError; + + // Dump the parsed representation, if requested. + if (getShowParsedOperands()) { + SmallString<256> Str; + raw_svector_ostream OS(Str); + OS << "parsed instruction: ["; + for (unsigned i = 0; i != Info.ParsedOperands.size(); ++i) { + if (i != 0) + OS << ", "; + Info.ParsedOperands[i]->print(OS); + } + OS << "]"; + + printMessage(IDLoc, SourceMgr::DK_Note, OS.str()); + } + + // If we are generating dwarf for the current section then generate a .loc + // directive for the instruction. + if (!HadError && getContext().getGenDwarfForAssembly() && + getContext().getGenDwarfSectionSyms().count( + getStreamer().getCurrentSection().first)) { + unsigned Line; + if (ActiveMacros.empty()) + Line = SrcMgr.FindLineNumber(IDLoc, CurBuffer); + else + Line = SrcMgr.FindLineNumber(ActiveMacros.front()->InstantiationLoc, + ActiveMacros.front()->ExitBuffer); + + // If we previously parsed a cpp hash file line comment then make sure the + // current Dwarf File is for the CppHashFilename if not then emit the + // Dwarf File table for it and adjust the line number for the .loc. + if (CppHashFilename.size()) { + unsigned FileNumber = getStreamer().EmitDwarfFileDirective( + 0, StringRef(), CppHashFilename); + getContext().setGenDwarfFileNumber(FileNumber); + + // Since SrcMgr.FindLineNumber() is slow and messes up the SourceMgr's + // cache with the different Loc from the call above we save the last + // info we queried here with SrcMgr.FindLineNumber(). + unsigned CppHashLocLineNo; + if (LastQueryIDLoc == CppHashLoc && LastQueryBuffer == CppHashBuf) + CppHashLocLineNo = LastQueryLine; + else { + CppHashLocLineNo = SrcMgr.FindLineNumber(CppHashLoc, CppHashBuf); + LastQueryLine = CppHashLocLineNo; + LastQueryIDLoc = CppHashLoc; + LastQueryBuffer = CppHashBuf; + } + Line = CppHashLineNumber - 1 + (Line - CppHashLocLineNo); + } + + getStreamer().EmitDwarfLocDirective( + getContext().getGenDwarfFileNumber(), Line, 0, + DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, 0, 0, + StringRef()); + } + + // If parsing succeeded, match the instruction. + if (!HadError) { + uint64_t ErrorInfo; + getTargetParser().MatchAndEmitInstruction(IDLoc, Info.Opcode, + Info.ParsedOperands, Out, + ErrorInfo, ParsingInlineAsm); + } + + // 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(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; + CppHashBuf = CurBuffer; + + // Ignore any trailing characters, they're just comment. + eatToEndOfLine(); + return false; +} + +/// \brief will use 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(); + SMLoc DiagLoc = Diag.getLoc(); + unsigned DiagBuf = DiagSrcMgr.FindBufferContainingLoc(DiagLoc); + unsigned CppHashBuf = + Parser->SrcMgr.FindBufferContainingLoc(Parser->CppHashLoc); + + // Like SourceMgr::printMessage() we need to print the include stack if any + // before printing the message. + unsigned DiagCurBuffer = DiagSrcMgr.FindBufferContainingLoc(DiagLoc); + if (!Parser->SavedDiagHandler && DiagCurBuffer && + DiagCurBuffer != DiagSrcMgr.getMainFileID()) { + 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(nullptr, 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(nullptr, OS); +} + +// FIXME: This is mostly duplicated from the function in AsmLexer.cpp. The +// difference being that that function accepts '@' as part of identifiers and +// we can't do that. AsmLexer.cpp should probably be changed to handle +// '@' as a special case when needed. +static bool isIdentifierChar(char c) { + return isalnum(static_cast<unsigned char>(c)) || c == '_' || c == '$' || + c == '.'; +} + +bool AsmParser::expandMacro(raw_svector_ostream &OS, StringRef Body, + ArrayRef<MCAsmMacroParameter> Parameters, + ArrayRef<MCAsmMacroArgument> A, + bool EnableAtPseudoVariable, SMLoc L) { + unsigned NParameters = Parameters.size(); + bool HasVararg = NParameters ? Parameters.back().Vararg : false; + if ((!IsDarwin || NParameters != 0) && NParameters != A.size()) + return Error(L, "Wrong number of arguments"); + + // A macro without parameters is handled differently on Darwin: + // gas accepts no arguments and does no substitutions + 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 (IsDarwin && !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(static_cast<unsigned char>(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 (IsDarwin && !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 (const AsmToken &Token : A[Index]) + OS << Token.getString(); + break; + } + } + Pos += 2; + } else { + unsigned I = Pos + 1; + + // Check for the \@ pseudo-variable. + if (EnableAtPseudoVariable && Body[I] == '@' && I + 1 != End) + ++I; + else + while (isIdentifierChar(Body[I]) && I + 1 != End) + ++I; + + const char *Begin = Body.data() + Pos + 1; + StringRef Argument(Begin, I - (Pos + 1)); + unsigned Index = 0; + + if (Argument == "@") { + OS << NumOfMacroInstantiations; + Pos += 2; + } else { + for (; Index < NParameters; ++Index) + if (Parameters[Index].Name == Argument) + break; + + if (Index == NParameters) { + if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')') + Pos += 3; + else { + OS << '\\' << Argument; + Pos = I; + } + } else { + bool VarargParameter = HasVararg && Index == (NParameters - 1); + for (const AsmToken &Token : A[Index]) + // We expect no quotes around the string's contents when + // parsing for varargs. + if (Token.getKind() != AsmToken::String || VarargParameter) + OS << Token.getString(); + else + OS << Token.getStringContents(); + + Pos += 1 + Argument.size(); + } + } + } + // Update the scan point. + Body = Body.substr(Pos); + } + + return false; +} + +MacroInstantiation::MacroInstantiation(SMLoc IL, int EB, SMLoc EL, + size_t CondStackDepth) + : InstantiationLoc(IL), ExitBuffer(EB), ExitLoc(EL), + CondStackDepth(CondStackDepth) {} + +static bool isOperator(AsmToken::TokenKind kind) { + switch (kind) { + default: + return false; + case AsmToken::Plus: + case AsmToken::Minus: + case AsmToken::Tilde: + case AsmToken::Slash: + case AsmToken::Star: + case AsmToken::Dot: + case AsmToken::Equal: + case AsmToken::EqualEqual: + case AsmToken::Pipe: + case AsmToken::PipePipe: + case AsmToken::Caret: + case AsmToken::Amp: + case AsmToken::AmpAmp: + case AsmToken::Exclaim: + case AsmToken::ExclaimEqual: + case AsmToken::Percent: + case AsmToken::Less: + case AsmToken::LessEqual: + case AsmToken::LessLess: + case AsmToken::LessGreater: + case AsmToken::Greater: + case AsmToken::GreaterEqual: + case AsmToken::GreaterGreater: + return true; + } +} + +namespace { +class AsmLexerSkipSpaceRAII { +public: + AsmLexerSkipSpaceRAII(AsmLexer &Lexer, bool SkipSpace) : Lexer(Lexer) { + Lexer.setSkipSpace(SkipSpace); + } + + ~AsmLexerSkipSpaceRAII() { + Lexer.setSkipSpace(true); + } + +private: + AsmLexer &Lexer; +}; +} + +bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg) { + + if (Vararg) { + if (Lexer.isNot(AsmToken::EndOfStatement)) { + StringRef Str = parseStringToEndOfStatement(); + MA.emplace_back(AsmToken::String, Str); + } + return false; + } + + unsigned ParenLevel = 0; + unsigned AddTokens = 0; + + // Darwin doesn't use spaces to delmit arguments. + AsmLexerSkipSpaceRAII ScopedSkipSpace(Lexer, IsDarwin); + + for (;;) { + if (Lexer.is(AsmToken::Eof) || Lexer.is(AsmToken::Equal)) + return TokError("unexpected token in macro instantiation"); + + if (ParenLevel == 0 && Lexer.is(AsmToken::Comma)) + break; + + if (Lexer.is(AsmToken::Space)) { + Lex(); // Eat spaces + + // Spaces can delimit parameters, but could also be part an expression. + // If the token after a space is an operator, add the token and the next + // one into this argument + if (!IsDarwin) { + if (isOperator(Lexer.getKind())) { + // Check to see whether the token is used as an operator, + // or part of an identifier + const char *NextChar = getTok().getEndLoc().getPointer(); + if (*NextChar == ' ') + AddTokens = 2; + } + + if (!AddTokens && ParenLevel == 0) { + break; + } + } + } + + // handleMacroEntry relies on not advancing the lexer here + // to be able to fill in the remaining default parameter values + if (Lexer.is(AsmToken::EndOfStatement)) + break; + + // 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. + MA.push_back(getTok()); + if (AddTokens) + AddTokens--; + Lex(); + } + + if (ParenLevel != 0) + return TokError("unbalanced parentheses in macro argument"); + return false; +} + +// Parse the macro instantiation arguments. +bool AsmParser::parseMacroArguments(const MCAsmMacro *M, + MCAsmMacroArguments &A) { + const unsigned NParameters = M ? M->Parameters.size() : 0; + bool NamedParametersFound = false; + SmallVector<SMLoc, 4> FALocs; + + A.resize(NParameters); + FALocs.resize(NParameters); + + // Parse two kinds of macro invocations: + // - macros defined without any parameters accept an arbitrary number of them + // - macros defined with parameters accept at most that many of them + bool HasVararg = NParameters ? M->Parameters.back().Vararg : false; + for (unsigned Parameter = 0; !NParameters || Parameter < NParameters; + ++Parameter) { + SMLoc IDLoc = Lexer.getLoc(); + MCAsmMacroParameter FA; + + if (Lexer.is(AsmToken::Identifier) && Lexer.peekTok().is(AsmToken::Equal)) { + if (parseIdentifier(FA.Name)) { + Error(IDLoc, "invalid argument identifier for formal argument"); + eatToEndOfStatement(); + return true; + } + + if (!Lexer.is(AsmToken::Equal)) { + TokError("expected '=' after formal parameter identifier"); + eatToEndOfStatement(); + return true; + } + Lex(); + + NamedParametersFound = true; + } + + if (NamedParametersFound && FA.Name.empty()) { + Error(IDLoc, "cannot mix positional and keyword arguments"); + eatToEndOfStatement(); + return true; + } + + bool Vararg = HasVararg && Parameter == (NParameters - 1); + if (parseMacroArgument(FA.Value, Vararg)) + return true; + + unsigned PI = Parameter; + if (!FA.Name.empty()) { + unsigned FAI = 0; + for (FAI = 0; FAI < NParameters; ++FAI) + if (M->Parameters[FAI].Name == FA.Name) + break; + + if (FAI >= NParameters) { + assert(M && "expected macro to be defined"); + Error(IDLoc, + "parameter named '" + FA.Name + "' does not exist for macro '" + + M->Name + "'"); + return true; + } + PI = FAI; + } + + if (!FA.Value.empty()) { + if (A.size() <= PI) + A.resize(PI + 1); + A[PI] = FA.Value; + + if (FALocs.size() <= PI) + FALocs.resize(PI + 1); + + FALocs[PI] = Lexer.getLoc(); + } + + // At the end of the statement, fill in remaining arguments that have + // default values. If there aren't any, then the next argument is + // required but missing + if (Lexer.is(AsmToken::EndOfStatement)) { + bool Failure = false; + for (unsigned FAI = 0; FAI < NParameters; ++FAI) { + if (A[FAI].empty()) { + if (M->Parameters[FAI].Required) { + Error(FALocs[FAI].isValid() ? FALocs[FAI] : Lexer.getLoc(), + "missing value for required parameter " + "'" + M->Parameters[FAI].Name + "' in macro '" + M->Name + "'"); + Failure = true; + } + + if (!M->Parameters[FAI].Value.empty()) + A[FAI] = M->Parameters[FAI].Value; + } + } + return Failure; + } + + if (Lexer.is(AsmToken::Comma)) + Lex(); + } + + return TokError("too many positional arguments"); +} + +const MCAsmMacro *AsmParser::lookupMacro(StringRef Name) { + StringMap<MCAsmMacro>::iterator I = MacroMap.find(Name); + return (I == MacroMap.end()) ? nullptr : &I->getValue(); +} + +void AsmParser::defineMacro(StringRef Name, MCAsmMacro Macro) { + MacroMap.insert(std::make_pair(Name, std::move(Macro))); +} + +void AsmParser::undefineMacro(StringRef Name) { MacroMap.erase(Name); } + +bool AsmParser::handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc) { + // 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"); + + MCAsmMacroArguments A; + if (parseMacroArguments(M, A)) + return true; + + // Macro instantiation is lexical, unfortunately. We construct a new buffer + // to hold the macro body with substitutions. + SmallString<256> Buf; + StringRef Body = M->Body; + raw_svector_ostream OS(Buf); + + if (expandMacro(OS, Body, M->Parameters, A, true, getTok().getLoc())) + return true; + + // We include the .endmacro in the buffer as our cue to exit the macro + // instantiation. + OS << ".endmacro\n"; + + std::unique_ptr<MemoryBuffer> Instantiation = + MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>"); + + // Create the macro instantiation object and add to the current macro + // instantiation stack. + MacroInstantiation *MI = new MacroInstantiation( + NameLoc, CurBuffer, getTok().getLoc(), TheCondStack.size()); + ActiveMacros.push_back(MI); + + ++NumOfMacroInstantiations; + + // Jump to the macro instantiation and prime the lexer. + CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc()); + Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); + Lex(); + + return false; +} + +void AsmParser::handleMacroExit() { + // Jump to the EndOfStatement we should return to, and consume it. + jumpToLoc(ActiveMacros.back()->ExitLoc, ActiveMacros.back()->ExitBuffer); + Lex(); + + // Pop the instantiation entry. + delete ActiveMacros.back(); + ActiveMacros.pop_back(); +} + +bool AsmParser::parseAssignment(StringRef Name, bool allow_redef, + bool NoDeadStrip) { + MCSymbol *Sym; + const MCExpr *Value; + if (MCParserUtils::parseAssignmentExpression(Name, allow_redef, *this, Sym, + Value)) + return true; + + if (!Sym) { + // In the case where we parse an expression starting with a '.', we will + // not generate an error, nor will we create a symbol. In this case we + // should just return out. + return false; + } + + // Do the assignment. + Out.EmitAssignment(Sym, Value); + if (NoDeadStrip) + Out.EmitSymbolAttribute(Sym, MCSA_NoDeadStrip); + + 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' and '.def @feat.00', 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) || Lexer.is(AsmToken::At)) { + SMLoc PrefixLoc = getLexer().getLoc(); + + // Consume the prefix character, and check for a following identifier. + Lex(); + if (Lexer.isNot(AsmToken::Identifier)) + return true; + + // We have a '$' or '@' followed by an identifier, make sure they are adjacent. + if (PrefixLoc.getPointer() + 1 != getTok().getLoc().getPointer()) + return true; + + // Construct the joined identifier and consume the token. + Res = + StringRef(PrefixLoc.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, true); +} + +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); + if (ZeroTerminated) + getStreamer().EmitBytes(StringRef("\0", 1)); + + Lex(); + + if (getLexer().is(AsmToken::EndOfStatement)) + break; + + if (getLexer().isNot(AsmToken::Comma)) + return TokError("unexpected token in '" + Twine(IDVal) + "' directive"); + Lex(); + } + } + + Lex(); + return false; +} + +/// parseDirectiveReloc +/// ::= .reloc expression , identifier [ , expression ] +bool AsmParser::parseDirectiveReloc(SMLoc DirectiveLoc) { + const MCExpr *Offset; + const MCExpr *Expr = nullptr; + + SMLoc OffsetLoc = Lexer.getTok().getLoc(); + if (parseExpression(Offset)) + return true; + + // We can only deal with constant expressions at the moment. + int64_t OffsetValue; + if (!Offset->evaluateAsAbsolute(OffsetValue)) + return Error(OffsetLoc, "expression is not a constant value"); + + if (Lexer.isNot(AsmToken::Comma)) + return TokError("expected comma"); + Lexer.Lex(); + + if (Lexer.isNot(AsmToken::Identifier)) + return TokError("expected relocation name"); + SMLoc NameLoc = Lexer.getTok().getLoc(); + StringRef Name = Lexer.getTok().getIdentifier(); + Lexer.Lex(); + + if (Lexer.is(AsmToken::Comma)) { + Lexer.Lex(); + SMLoc ExprLoc = Lexer.getLoc(); + if (parseExpression(Expr)) + return true; + + MCValue Value; + if (!Expr->evaluateAsRelocatable(Value, nullptr, nullptr)) + return Error(ExprLoc, "expression must be relocatable"); + } + + if (Lexer.isNot(AsmToken::EndOfStatement)) + return TokError("unexpected token in .reloc directive"); + + if (getStreamer().EmitRelocDirective(*Offset, Name, Expr, DirectiveLoc)) + return Error(NameLoc, "unknown relocation name"); + + 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); + } else + getStreamer().EmitValue(Value, Size, ExprLoc); + + if (getLexer().is(AsmToken::EndOfStatement)) + break; + + // FIXME: Improve diagnostic. + if (getLexer().isNot(AsmToken::Comma)) + return TokError("unexpected token in directive"); + Lex(); + } + } + + Lex(); + return false; +} + +/// ParseDirectiveOctaValue +/// ::= .octa [ hexconstant (, hexconstant)* ] +bool AsmParser::parseDirectiveOctaValue() { + if (getLexer().isNot(AsmToken::EndOfStatement)) { + checkForValidSection(); + + for (;;) { + if (Lexer.getKind() == AsmToken::Error) + return true; + if (Lexer.getKind() != AsmToken::Integer && + Lexer.getKind() != AsmToken::BigNum) + return TokError("unknown token in expression"); + + SMLoc ExprLoc = getLexer().getLoc(); + APInt IntValue = getTok().getAPIntVal(); + Lex(); + + uint64_t hi, lo; + if (IntValue.isIntN(64)) { + hi = 0; + lo = IntValue.getZExtValue(); + } else if (IntValue.isIntN(128)) { + // It might actually have more than 128 bits, but the top ones are zero. + hi = IntValue.getHiBits(IntValue.getBitWidth() - 64).getZExtValue(); + lo = IntValue.getLoBits(64).getZExtValue(); + } else + return Error(ExprLoc, "literal value out of range for directive"); + + if (MAI.isLittleEndian()) { + getStreamer().EmitIntValue(lo, 8); + getStreamer().EmitIntValue(hi, 8); + } else { + getStreamer().EmitIntValue(hi, 8); + getStreamer().EmitIntValue(lo, 8); + } + + 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); + + if (getLexer().is(AsmToken::EndOfStatement)) + break; + + if (getLexer().isNot(AsmToken::Comma)) + return TokError("unexpected token in directive"); + Lex(); + } + } + + Lex(); + 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); + + return false; +} + +/// parseDirectiveFill +/// ::= .fill expression [ , expression [ , expression ] ] +bool AsmParser::parseDirectiveFill() { + checkForValidSection(); + + SMLoc RepeatLoc = getLexer().getLoc(); + int64_t NumValues; + if (parseAbsoluteExpression(NumValues)) + return true; + + if (NumValues < 0) { + Warning(RepeatLoc, + "'.fill' directive with negative repeat count has no effect"); + NumValues = 0; + } + + int64_t FillSize = 1; + int64_t FillExpr = 0; + + SMLoc SizeLoc, ExprLoc; + if (getLexer().isNot(AsmToken::EndOfStatement)) { + if (getLexer().isNot(AsmToken::Comma)) + return TokError("unexpected token in '.fill' directive"); + Lex(); + + SizeLoc = getLexer().getLoc(); + if (parseAbsoluteExpression(FillSize)) + return true; + + if (getLexer().isNot(AsmToken::EndOfStatement)) { + if (getLexer().isNot(AsmToken::Comma)) + return TokError("unexpected token in '.fill' directive"); + Lex(); + + ExprLoc = getLexer().getLoc(); + if (parseAbsoluteExpression(FillExpr)) + return true; + + if (getLexer().isNot(AsmToken::EndOfStatement)) + return TokError("unexpected token in '.fill' directive"); + + Lex(); + } + } + + if (FillSize < 0) { + Warning(SizeLoc, "'.fill' directive with negative size has no effect"); + NumValues = 0; + } + if (FillSize > 8) { + Warning(SizeLoc, "'.fill' directive with size greater than 8 has been truncated to 8"); + FillSize = 8; + } + + if (!isUInt<32>(FillExpr) && FillSize > 4) + Warning(ExprLoc, "'.fill' directive pattern has been truncated to 32-bits"); + + if (NumValues > 0) { + int64_t NonZeroFillSize = FillSize > 4 ? 4 : FillSize; + FillExpr &= ~0ULL >> (64 - NonZeroFillSize * 8); + for (uint64_t i = 0, e = NumValues; i != e; ++i) { + getStreamer().EmitIntValue(FillExpr, NonZeroFillSize); + if (NonZeroFillSize < FillSize) + getStreamer().EmitIntValue(0, FillSize - NonZeroFillSize); + } + } + + 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(); + 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; + } else { + // Reject alignments that aren't either a power of two or zero, + // for gas compatibility. Alignment of zero is silently rounded + // up to one. + if (Alignment == 0) + Alignment = 1; + if (!isPowerOf2_64(Alignment)) + Error(AlignmentLoc, "alignment must be a power of 2"); + } + + // 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. + const MCSection *Section = getStreamer().getCurrentSection().first; + assert(Section && "must have section to emit alignment"); + bool UseCodeAlign = Section->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; +} + +/// parseDirectiveFile +/// ::= .file [number] filename +/// ::= .file number directory filename +bool AsmParser::parseDirectiveFile(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. + // Allow the strings to have escaped octal character sequence. + std::string Path = getTok().getString(); + if (parseEscapedString(Path)) + return true; + Lex(); + + StringRef Directory; + StringRef Filename; + std::string FilenameData; + if (getLexer().is(AsmToken::String)) { + if (FileNumber == -1) + return TokError("explicit path specified, but no file number"); + if (parseEscapedString(FilenameData)) + return true; + Filename = FilenameData; + Directory = Path; + Lex(); + } else { + Filename = Path; + } + + if (getLexer().isNot(AsmToken::EndOfStatement)) + return TokError("unexpected token in '.file' directive"); + + if (FileNumber == -1) + getStreamer().EmitFileDirective(Filename); + else { + if (getContext().getGenDwarfForAssembly()) + Error(DirectiveLoc, + "input can't have .file dwarf directives when -g is " + "used to generate dwarf debug info for assembly code"); + + if (getStreamer().EmitDwarfFileDirective(FileNumber, Directory, Filename) == + 0) + Error(FileNumberLoc, "file number already allocated"); + } + + return false; +} + +/// parseDirectiveLine +/// ::= .line [number] +bool AsmParser::parseDirectiveLine() { + 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 AsmParser::parseDirectiveLoc() { + 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 < 0) + return TokError("line number less than zero 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 (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") { + Loc = getTok().getLoc(); + const MCExpr *Value; + if (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") { + Loc = getTok().getLoc(); + const MCExpr *Value; + if (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 (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 AsmParser::parseDirectiveStabs() { + return TokError("unsupported directive '.stabs'"); +} + +/// parseDirectiveCFISections +/// ::= .cfi_sections section [, section] +bool AsmParser::parseDirectiveCFISections() { + StringRef Name; + bool EH = false; + bool Debug = false; + + if (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 (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 [simple] +bool AsmParser::parseDirectiveCFIStartProc() { + StringRef Simple; + if (getLexer().isNot(AsmToken::EndOfStatement)) + if (parseIdentifier(Simple) || Simple != "simple") + return TokError("unexpected token in .cfi_startproc directive"); + + getStreamer().EmitCFIStartProc(!Simple.empty()); + return false; +} + +/// parseDirectiveCFIEndProc +/// ::= .cfi_endproc +bool AsmParser::parseDirectiveCFIEndProc() { + getStreamer().EmitCFIEndProc(); + return false; +} + +/// \brief parse register name or number. +bool AsmParser::parseRegisterOrRegisterNumber(int64_t &Register, + SMLoc DirectiveLoc) { + unsigned RegNo; + + if (getLexer().isNot(AsmToken::Integer)) { + if (getTargetParser().ParseRegister(RegNo, DirectiveLoc, DirectiveLoc)) + return true; + Register = getContext().getRegisterInfo()->getDwarfRegNum(RegNo, true); + } else + return parseAbsoluteExpression(Register); + + return false; +} + +/// parseDirectiveCFIDefCfa +/// ::= .cfi_def_cfa register, offset +bool AsmParser::parseDirectiveCFIDefCfa(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 (parseAbsoluteExpression(Offset)) + return true; + + getStreamer().EmitCFIDefCfa(Register, Offset); + return false; +} + +/// parseDirectiveCFIDefCfaOffset +/// ::= .cfi_def_cfa_offset offset +bool AsmParser::parseDirectiveCFIDefCfaOffset() { + int64_t Offset = 0; + if (parseAbsoluteExpression(Offset)) + return true; + + getStreamer().EmitCFIDefCfaOffset(Offset); + return false; +} + +/// parseDirectiveCFIRegister +/// ::= .cfi_register register, register +bool AsmParser::parseDirectiveCFIRegister(SMLoc DirectiveLoc) { + int64_t Register1 = 0; + if (parseRegisterOrRegisterNumber(Register1, DirectiveLoc)) + return true; + + if (getLexer().isNot(AsmToken::Comma)) + return TokError("unexpected token in directive"); + Lex(); + + int64_t Register2 = 0; + if (parseRegisterOrRegisterNumber(Register2, DirectiveLoc)) + return true; + + getStreamer().EmitCFIRegister(Register1, Register2); + return false; +} + +/// parseDirectiveCFIWindowSave +/// ::= .cfi_window_save +bool AsmParser::parseDirectiveCFIWindowSave() { + getStreamer().EmitCFIWindowSave(); + return false; +} + +/// parseDirectiveCFIAdjustCfaOffset +/// ::= .cfi_adjust_cfa_offset adjustment +bool AsmParser::parseDirectiveCFIAdjustCfaOffset() { + int64_t Adjustment = 0; + if (parseAbsoluteExpression(Adjustment)) + return true; + + getStreamer().EmitCFIAdjustCfaOffset(Adjustment); + return false; +} + +/// parseDirectiveCFIDefCfaRegister +/// ::= .cfi_def_cfa_register register +bool AsmParser::parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc) { + int64_t Register = 0; + if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) + return true; + + getStreamer().EmitCFIDefCfaRegister(Register); + return false; +} + +/// parseDirectiveCFIOffset +/// ::= .cfi_offset register, offset +bool AsmParser::parseDirectiveCFIOffset(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 (parseAbsoluteExpression(Offset)) + return true; + + getStreamer().EmitCFIOffset(Register, Offset); + return false; +} + +/// parseDirectiveCFIRelOffset +/// ::= .cfi_rel_offset register, offset +bool AsmParser::parseDirectiveCFIRelOffset(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 (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 +/// IsPersonality true for cfi_personality, false for cfi_lsda +/// ::= .cfi_personality encoding, [symbol_name] +/// ::= .cfi_lsda encoding, [symbol_name] +bool AsmParser::parseDirectiveCFIPersonalityOrLsda(bool IsPersonality) { + int64_t Encoding = 0; + if (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 (parseIdentifier(Name)) + return TokError("expected identifier in directive"); + + MCSymbol *Sym = getContext().getOrCreateSymbol(Name); + + if (IsPersonality) + getStreamer().EmitCFIPersonality(Sym, Encoding); + else + getStreamer().EmitCFILsda(Sym, Encoding); + return false; +} + +/// parseDirectiveCFIRememberState +/// ::= .cfi_remember_state +bool AsmParser::parseDirectiveCFIRememberState() { + getStreamer().EmitCFIRememberState(); + return false; +} + +/// parseDirectiveCFIRestoreState +/// ::= .cfi_remember_state +bool AsmParser::parseDirectiveCFIRestoreState() { + getStreamer().EmitCFIRestoreState(); + return false; +} + +/// parseDirectiveCFISameValue +/// ::= .cfi_same_value register +bool AsmParser::parseDirectiveCFISameValue(SMLoc DirectiveLoc) { + int64_t Register = 0; + + if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) + return true; + + getStreamer().EmitCFISameValue(Register); + return false; +} + +/// parseDirectiveCFIRestore +/// ::= .cfi_restore register +bool AsmParser::parseDirectiveCFIRestore(SMLoc DirectiveLoc) { + int64_t Register = 0; + if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) + return true; + + getStreamer().EmitCFIRestore(Register); + return false; +} + +/// parseDirectiveCFIEscape +/// ::= .cfi_escape expression[,...] +bool AsmParser::parseDirectiveCFIEscape() { + std::string Values; + int64_t CurrValue; + if (parseAbsoluteExpression(CurrValue)) + return true; + + Values.push_back((uint8_t)CurrValue); + + while (getLexer().is(AsmToken::Comma)) { + Lex(); + + if (parseAbsoluteExpression(CurrValue)) + return true; + + Values.push_back((uint8_t)CurrValue); + } + + getStreamer().EmitCFIEscape(Values); + return false; +} + +/// parseDirectiveCFISignalFrame +/// ::= .cfi_signal_frame +bool AsmParser::parseDirectiveCFISignalFrame() { + if (getLexer().isNot(AsmToken::EndOfStatement)) + return Error(getLexer().getLoc(), + "unexpected token in '.cfi_signal_frame'"); + + getStreamer().EmitCFISignalFrame(); + return false; +} + +/// parseDirectiveCFIUndefined +/// ::= .cfi_undefined register +bool AsmParser::parseDirectiveCFIUndefined(SMLoc DirectiveLoc) { + int64_t Register = 0; + + if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) + return true; + + getStreamer().EmitCFIUndefined(Register); + return false; +} + +/// parseDirectiveMacrosOnOff +/// ::= .macros_on +/// ::= .macros_off +bool AsmParser::parseDirectiveMacrosOnOff(StringRef Directive) { + if (getLexer().isNot(AsmToken::EndOfStatement)) + return Error(getLexer().getLoc(), + "unexpected token in '" + Directive + "' directive"); + + setMacrosEnabled(Directive == ".macros_on"); + return false; +} + +/// parseDirectiveMacro +/// ::= .macro name[,] [parameters] +bool AsmParser::parseDirectiveMacro(SMLoc DirectiveLoc) { + StringRef Name; + if (parseIdentifier(Name)) + return TokError("expected identifier in '.macro' directive"); + + if (getLexer().is(AsmToken::Comma)) + Lex(); + + MCAsmMacroParameters Parameters; + while (getLexer().isNot(AsmToken::EndOfStatement)) { + + if (!Parameters.empty() && Parameters.back().Vararg) + return Error(Lexer.getLoc(), + "Vararg parameter '" + Parameters.back().Name + + "' should be last one in the list of parameters."); + + MCAsmMacroParameter Parameter; + if (parseIdentifier(Parameter.Name)) + return TokError("expected identifier in '.macro' directive"); + + if (Lexer.is(AsmToken::Colon)) { + Lex(); // consume ':' + + SMLoc QualLoc; + StringRef Qualifier; + + QualLoc = Lexer.getLoc(); + if (parseIdentifier(Qualifier)) + return Error(QualLoc, "missing parameter qualifier for " + "'" + Parameter.Name + "' in macro '" + Name + "'"); + + if (Qualifier == "req") + Parameter.Required = true; + else if (Qualifier == "vararg") + Parameter.Vararg = true; + else + return Error(QualLoc, Qualifier + " is not a valid parameter qualifier " + "for '" + Parameter.Name + "' in macro '" + Name + "'"); + } + + if (getLexer().is(AsmToken::Equal)) { + Lex(); + + SMLoc ParamLoc; + + ParamLoc = Lexer.getLoc(); + if (parseMacroArgument(Parameter.Value, /*Vararg=*/false )) + return true; + + if (Parameter.Required) + Warning(ParamLoc, "pointless default value for required parameter " + "'" + Parameter.Name + "' in macro '" + Name + "'"); + } + + Parameters.push_back(std::move(Parameter)); + + if (getLexer().is(AsmToken::Comma)) + Lex(); + } + + // Eat the end of statement. + Lex(); + + AsmToken EndToken, StartToken = getTok(); + unsigned MacroDepth = 0; + + // 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)) { + if (getTok().getIdentifier() == ".endm" || + getTok().getIdentifier() == ".endmacro") { + if (MacroDepth == 0) { // Outermost macro. + EndToken = getTok(); + Lex(); + if (getLexer().isNot(AsmToken::EndOfStatement)) + return TokError("unexpected token in '" + EndToken.getIdentifier() + + "' directive"); + break; + } else { + // Otherwise we just found the end of an inner macro. + --MacroDepth; + } + } else if (getTok().getIdentifier() == ".macro") { + // We allow nested macros. Those aren't instantiated until the outermost + // macro is expanded so just ignore them for now. + ++MacroDepth; + } + } + + // Otherwise, scan til the end of the statement. + eatToEndOfStatement(); + } + + if (lookupMacro(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); + checkForBadMacro(DirectiveLoc, Name, Body, Parameters); + defineMacro(Name, MCAsmMacro(Name, Body, std::move(Parameters))); + return false; +} + +/// checkForBadMacro +/// +/// With the support added for named parameters there may be code out there that +/// is transitioning from positional parameters. In versions of gas that did +/// not support named parameters they would be ignored on the macro definition. +/// But to support both styles of parameters this is not possible so if a macro +/// definition has named parameters but does not use them and has what appears +/// to be positional parameters, strings like $1, $2, ... and $n, then issue a +/// warning that the positional parameter found in body which have no effect. +/// Hoping the developer will either remove the named parameters from the macro +/// definition so the positional parameters get used if that was what was +/// intended or change the macro to use the named parameters. It is possible +/// this warning will trigger when the none of the named parameters are used +/// and the strings like $1 are infact to simply to be passed trough unchanged. +void AsmParser::checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, + StringRef Body, + ArrayRef<MCAsmMacroParameter> Parameters) { + // If this macro is not defined with named parameters the warning we are + // checking for here doesn't apply. + unsigned NParameters = Parameters.size(); + if (NParameters == 0) + return; + + bool NamedParametersFound = false; + bool PositionalParametersFound = false; + + // Look at the body of the macro for use of both the named parameters and what + // are likely to be positional parameters. This is what expandMacro() is + // doing when it finds the parameters in the body. + while (!Body.empty()) { + // Scan for the next possible parameter. + std::size_t End = Body.size(), Pos = 0; + for (; Pos != End; ++Pos) { + // Check for a substitution or escape. + // This macro is defined with parameters, look for \foo, \bar, etc. + if (Body[Pos] == '\\' && Pos + 1 != End) + break; + + // This macro should have parameters, but look for $0, $1, ..., $n too. + if (Body[Pos] != '$' || Pos + 1 == End) + continue; + char Next = Body[Pos + 1]; + if (Next == '$' || Next == 'n' || + isdigit(static_cast<unsigned char>(Next))) + break; + } + + // Check if we reached the end. + if (Pos == End) + break; + + if (Body[Pos] == '$') { + switch (Body[Pos + 1]) { + // $$ => $ + case '$': + break; + + // $n => number of arguments + case 'n': + PositionalParametersFound = true; + break; + + // $[0-9] => argument + default: { + PositionalParametersFound = true; + break; + } + } + Pos += 2; + } else { + unsigned I = Pos + 1; + while (isIdentifierChar(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].Name == Argument) + break; + + if (Index == NParameters) { + if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')') + Pos += 3; + else { + Pos = I; + } + } else { + NamedParametersFound = true; + Pos += 1 + Argument.size(); + } + } + // Update the scan point. + Body = Body.substr(Pos); + } + + if (!NamedParametersFound && PositionalParametersFound) + Warning(DirectiveLoc, "macro defined with named parameters which are not " + "used in macro body, possible positional parameter " + "found in body which will have no effect"); +} + +/// parseDirectiveExitMacro +/// ::= .exitm +bool AsmParser::parseDirectiveExitMacro(StringRef Directive) { + if (getLexer().isNot(AsmToken::EndOfStatement)) + return TokError("unexpected token in '" + Directive + "' directive"); + + if (!isInsideMacroInstantiation()) + return TokError("unexpected '" + Directive + "' in file, " + "no current macro definition"); + + // Exit all conditionals that are active in the current macro. + while (TheCondStack.size() != ActiveMacros.back()->CondStackDepth) { + TheCondState = TheCondStack.back(); + TheCondStack.pop_back(); + } + + handleMacroExit(); + return false; +} + +/// parseDirectiveEndMacro +/// ::= .endm +/// ::= .endmacro +bool AsmParser::parseDirectiveEndMacro(StringRef Directive) { + if (getLexer().isNot(AsmToken::EndOfStatement)) + return TokError("unexpected token in '" + Directive + "' directive"); + + // If we are inside a macro instantiation, terminate the current + // instantiation. + if (isInsideMacroInstantiation()) { + 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"); +} + +/// parseDirectivePurgeMacro +/// ::= .purgem +bool AsmParser::parseDirectivePurgeMacro(SMLoc DirectiveLoc) { + StringRef Name; + if (parseIdentifier(Name)) + return TokError("expected identifier in '.purgem' directive"); + + if (getLexer().isNot(AsmToken::EndOfStatement)) + return TokError("unexpected token in '.purgem' directive"); + + if (!lookupMacro(Name)) + return Error(DirectiveLoc, "macro '" + Name + "' is not defined"); + + undefineMacro(Name); + return false; +} + +/// parseDirectiveBundleAlignMode +/// ::= {.bundle_align_mode} expression +bool AsmParser::parseDirectiveBundleAlignMode() { + checkForValidSection(); + + // Expect a single argument: an expression that evaluates to a constant + // in the inclusive range 0-30. + SMLoc ExprLoc = getLexer().getLoc(); + int64_t AlignSizePow2; + if (parseAbsoluteExpression(AlignSizePow2)) + return true; + else if (getLexer().isNot(AsmToken::EndOfStatement)) + return TokError("unexpected token after expression in" + " '.bundle_align_mode' directive"); + else if (AlignSizePow2 < 0 || AlignSizePow2 > 30) + return Error(ExprLoc, + "invalid bundle alignment size (expected between 0 and 30)"); + + Lex(); + + // Because of AlignSizePow2's verified range we can safely truncate it to + // unsigned. + getStreamer().EmitBundleAlignMode(static_cast<unsigned>(AlignSizePow2)); + return false; +} + +/// parseDirectiveBundleLock +/// ::= {.bundle_lock} [align_to_end] +bool AsmParser::parseDirectiveBundleLock() { + checkForValidSection(); + bool AlignToEnd = false; + + if (getLexer().isNot(AsmToken::EndOfStatement)) { + StringRef Option; + SMLoc Loc = getTok().getLoc(); + const char *kInvalidOptionError = + "invalid option for '.bundle_lock' directive"; + + if (parseIdentifier(Option)) + return Error(Loc, kInvalidOptionError); + + if (Option != "align_to_end") + return Error(Loc, kInvalidOptionError); + else if (getLexer().isNot(AsmToken::EndOfStatement)) + return Error(Loc, + "unexpected token after '.bundle_lock' directive option"); + AlignToEnd = true; + } + + Lex(); + + getStreamer().EmitBundleLock(AlignToEnd); + return false; +} + +/// parseDirectiveBundleLock +/// ::= {.bundle_lock} +bool AsmParser::parseDirectiveBundleUnlock() { + checkForValidSection(); + + if (getLexer().isNot(AsmToken::EndOfStatement)) + return TokError("unexpected token in '.bundle_unlock' directive"); + Lex(); + + getStreamer().EmitBundleUnlock(); + return false; +} + +/// parseDirectiveSpace +/// ::= (.skip | .space) expression [ , expression ] +bool AsmParser::parseDirectiveSpace(StringRef IDVal) { + 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 '" + Twine(IDVal) + "' directive"); + Lex(); + + if (parseAbsoluteExpression(FillExpr)) + return true; + + if (getLexer().isNot(AsmToken::EndOfStatement)) + return TokError("unexpected token in '" + Twine(IDVal) + "' directive"); + } + + Lex(); + + if (NumBytes <= 0) + return TokError("invalid number of bytes in '" + Twine(IDVal) + + "' directive"); + + // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0. + getStreamer().EmitFill(NumBytes, FillExpr); + + return false; +} + +/// parseDirectiveLEB128 +/// ::= (.sleb128 | .uleb128) [ expression (, expression)* ] +bool AsmParser::parseDirectiveLEB128(bool Signed) { + checkForValidSection(); + const MCExpr *Value; + + for (;;) { + if (parseExpression(Value)) + return true; + + if (Signed) + getStreamer().EmitSLEB128Value(Value); + else + getStreamer().EmitULEB128Value(Value); + + if (getLexer().is(AsmToken::EndOfStatement)) + break; + + if (getLexer().isNot(AsmToken::Comma)) + return TokError("unexpected token in directive"); + Lex(); + } + + 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"); + + if (!getStreamer().EmitSymbolAttribute(Sym, Attr)) + return Error(Loc, "unable to emit symbol attribute"); + + 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; + + LCOMM::LCOMMType LCOMM = Lexer.getMAI().getLCOMMDirectiveAlignmentType(); + if (IsLocal && LCOMM == LCOMM::NoAlignment) + return Error(Pow2AlignmentLoc, "alignment not supported on this target"); + + // If this target takes alignments in bytes (not log) validate and convert. + if ((!IsLocal && Lexer.getMAI().getCOMMDirectiveAlignmentIsInBytes()) || + (IsLocal && LCOMM == LCOMM::ByteAlignment)) { + 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"); + + // Create the Symbol as a common or local common with Size and Pow2Alignment + if (IsLocal) { + getStreamer().EmitLocalCommonSymbol(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"); + + // Allow the strings to have escaped octal character sequence. + std::string Filename; + if (parseEscapedString(Filename)) + return true; + SMLoc IncludeLoc = getLexer().getLoc(); + Lex(); + + if (getLexer().isNot(AsmToken::EndOfStatement)) + return TokError("unexpected token in '.include' directive"); + + // 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"); + + // Allow the strings to have escaped octal character sequence. + std::string Filename; + if (parseEscapedString(Filename)) + return true; + SMLoc IncbinLoc = getLexer().getLoc(); + Lex(); + + if (getLexer().isNot(AsmToken::EndOfStatement)) + return TokError("unexpected token in '.incbin' directive"); + + // Attempt to process the included file. + if (processIncbinFile(Filename)) { + Error(IncbinLoc, "Could not find incbin file '" + Filename + "'"); + return true; + } + + return false; +} + +/// parseDirectiveIf +/// ::= .if{,eq,ge,gt,le,lt,ne} expression +bool AsmParser::parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind) { + 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(); + + switch (DirKind) { + default: + llvm_unreachable("unsupported directive"); + case DK_IF: + case DK_IFNE: + break; + case DK_IFEQ: + ExprValue = ExprValue == 0; + break; + case DK_IFGE: + ExprValue = ExprValue >= 0; + break; + case DK_IFGT: + ExprValue = ExprValue > 0; + break; + case DK_IFLE: + ExprValue = ExprValue <= 0; + break; + case DK_IFLT: + ExprValue = ExprValue < 0; + break; + } + + TheCondState.CondMet = ExprValue; + TheCondState.Ignore = !TheCondState.CondMet; + } + + return false; +} + +/// parseDirectiveIfb +/// ::= .ifb string +bool AsmParser::parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank) { + TheCondStack.push_back(TheCondState); + TheCondState.TheCond = AsmCond::IfCond; + + if (TheCondState.Ignore) { + eatToEndOfStatement(); + } else { + StringRef Str = parseStringToEndOfStatement(); + + if (getLexer().isNot(AsmToken::EndOfStatement)) + return TokError("unexpected token in '.ifb' directive"); + + Lex(); + + TheCondState.CondMet = ExpectBlank == Str.empty(); + TheCondState.Ignore = !TheCondState.CondMet; + } + + return false; +} + +/// parseDirectiveIfc +/// ::= .ifc string1, string2 +/// ::= .ifnc string1, string2 +bool AsmParser::parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual) { + TheCondStack.push_back(TheCondState); + TheCondState.TheCond = AsmCond::IfCond; + + if (TheCondState.Ignore) { + eatToEndOfStatement(); + } else { + StringRef Str1 = parseStringToComma(); + + if (getLexer().isNot(AsmToken::Comma)) + return TokError("unexpected token in '.ifc' directive"); + + Lex(); + + StringRef Str2 = parseStringToEndOfStatement(); + + if (getLexer().isNot(AsmToken::EndOfStatement)) + return TokError("unexpected token in '.ifc' directive"); + + Lex(); + + TheCondState.CondMet = ExpectEqual == (Str1.trim() == Str2.trim()); + TheCondState.Ignore = !TheCondState.CondMet; + } + + return false; +} + +/// parseDirectiveIfeqs +/// ::= .ifeqs string1, string2 +bool AsmParser::parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual) { + if (Lexer.isNot(AsmToken::String)) { + if (ExpectEqual) + TokError("expected string parameter for '.ifeqs' directive"); + else + TokError("expected string parameter for '.ifnes' directive"); + eatToEndOfStatement(); + return true; + } + + StringRef String1 = getTok().getStringContents(); + Lex(); + + if (Lexer.isNot(AsmToken::Comma)) { + if (ExpectEqual) + TokError("expected comma after first string for '.ifeqs' directive"); + else + TokError("expected comma after first string for '.ifnes' directive"); + eatToEndOfStatement(); + return true; + } + + Lex(); + + if (Lexer.isNot(AsmToken::String)) { + if (ExpectEqual) + TokError("expected string parameter for '.ifeqs' directive"); + else + TokError("expected string parameter for '.ifnes' directive"); + eatToEndOfStatement(); + return true; + } + + StringRef String2 = getTok().getStringContents(); + Lex(); + + TheCondStack.push_back(TheCondState); + TheCondState.TheCond = AsmCond::IfCond; + TheCondState.CondMet = ExpectEqual == (String1 == String2); + TheCondState.Ignore = !TheCondState.CondMet; + + return false; +} + +/// parseDirectiveIfdef +/// ::= .ifdef symbol +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 && !Sym->isUndefined()); + else + TheCondState.CondMet = (!Sym || 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; +} + +/// parseDirectiveEnd +/// ::= .end +bool AsmParser::parseDirectiveEnd(SMLoc DirectiveLoc) { + if (getLexer().isNot(AsmToken::EndOfStatement)) + return TokError("unexpected token in '.end' directive"); + + Lex(); + + while (Lexer.isNot(AsmToken::Eof)) + Lex(); + + return false; +} + +/// parseDirectiveError +/// ::= .err +/// ::= .error [string] +bool AsmParser::parseDirectiveError(SMLoc L, bool WithMessage) { + if (!TheCondStack.empty()) { + if (TheCondStack.back().Ignore) { + eatToEndOfStatement(); + return false; + } + } + + if (!WithMessage) + return Error(L, ".err encountered"); + + StringRef Message = ".error directive invoked in source file"; + if (Lexer.isNot(AsmToken::EndOfStatement)) { + if (Lexer.isNot(AsmToken::String)) { + TokError(".error argument must be a string"); + eatToEndOfStatement(); + return true; + } + + Message = getTok().getStringContents(); + Lex(); + } + + Error(L, Message); + return true; +} + +/// parseDirectiveWarning +/// ::= .warning [string] +bool AsmParser::parseDirectiveWarning(SMLoc L) { + if (!TheCondStack.empty()) { + if (TheCondStack.back().Ignore) { + eatToEndOfStatement(); + return false; + } + } + + StringRef Message = ".warning directive invoked in source file"; + if (Lexer.isNot(AsmToken::EndOfStatement)) { + if (Lexer.isNot(AsmToken::String)) { + TokError(".warning argument must be a string"); + eatToEndOfStatement(); + return true; + } + + Message = getTok().getStringContents(); + Lex(); + } + + Warning(L, Message); + 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; +} + +void AsmParser::initializeDirectiveKindMap() { + DirectiveKindMap[".set"] = DK_SET; + DirectiveKindMap[".equ"] = DK_EQU; + DirectiveKindMap[".equiv"] = DK_EQUIV; + DirectiveKindMap[".ascii"] = DK_ASCII; + DirectiveKindMap[".asciz"] = DK_ASCIZ; + DirectiveKindMap[".string"] = DK_STRING; + DirectiveKindMap[".byte"] = DK_BYTE; + DirectiveKindMap[".short"] = DK_SHORT; + DirectiveKindMap[".value"] = DK_VALUE; + DirectiveKindMap[".2byte"] = DK_2BYTE; + DirectiveKindMap[".long"] = DK_LONG; + DirectiveKindMap[".int"] = DK_INT; + DirectiveKindMap[".4byte"] = DK_4BYTE; + DirectiveKindMap[".quad"] = DK_QUAD; + DirectiveKindMap[".8byte"] = DK_8BYTE; + DirectiveKindMap[".octa"] = DK_OCTA; + DirectiveKindMap[".single"] = DK_SINGLE; + DirectiveKindMap[".float"] = DK_FLOAT; + DirectiveKindMap[".double"] = DK_DOUBLE; + DirectiveKindMap[".align"] = DK_ALIGN; + DirectiveKindMap[".align32"] = DK_ALIGN32; + DirectiveKindMap[".balign"] = DK_BALIGN; + DirectiveKindMap[".balignw"] = DK_BALIGNW; + DirectiveKindMap[".balignl"] = DK_BALIGNL; + DirectiveKindMap[".p2align"] = DK_P2ALIGN; + DirectiveKindMap[".p2alignw"] = DK_P2ALIGNW; + DirectiveKindMap[".p2alignl"] = DK_P2ALIGNL; + DirectiveKindMap[".org"] = DK_ORG; + DirectiveKindMap[".fill"] = DK_FILL; + DirectiveKindMap[".zero"] = DK_ZERO; + DirectiveKindMap[".extern"] = DK_EXTERN; + DirectiveKindMap[".globl"] = DK_GLOBL; + DirectiveKindMap[".global"] = DK_GLOBAL; + DirectiveKindMap[".lazy_reference"] = DK_LAZY_REFERENCE; + DirectiveKindMap[".no_dead_strip"] = DK_NO_DEAD_STRIP; + DirectiveKindMap[".symbol_resolver"] = DK_SYMBOL_RESOLVER; + DirectiveKindMap[".private_extern"] = DK_PRIVATE_EXTERN; + DirectiveKindMap[".reference"] = DK_REFERENCE; + DirectiveKindMap[".weak_definition"] = DK_WEAK_DEFINITION; + DirectiveKindMap[".weak_reference"] = DK_WEAK_REFERENCE; + DirectiveKindMap[".weak_def_can_be_hidden"] = DK_WEAK_DEF_CAN_BE_HIDDEN; + DirectiveKindMap[".comm"] = DK_COMM; + DirectiveKindMap[".common"] = DK_COMMON; + DirectiveKindMap[".lcomm"] = DK_LCOMM; + DirectiveKindMap[".abort"] = DK_ABORT; + DirectiveKindMap[".include"] = DK_INCLUDE; + DirectiveKindMap[".incbin"] = DK_INCBIN; + DirectiveKindMap[".code16"] = DK_CODE16; + DirectiveKindMap[".code16gcc"] = DK_CODE16GCC; + DirectiveKindMap[".rept"] = DK_REPT; + DirectiveKindMap[".rep"] = DK_REPT; + DirectiveKindMap[".irp"] = DK_IRP; + DirectiveKindMap[".irpc"] = DK_IRPC; + DirectiveKindMap[".endr"] = DK_ENDR; + DirectiveKindMap[".bundle_align_mode"] = DK_BUNDLE_ALIGN_MODE; + DirectiveKindMap[".bundle_lock"] = DK_BUNDLE_LOCK; + DirectiveKindMap[".bundle_unlock"] = DK_BUNDLE_UNLOCK; + DirectiveKindMap[".if"] = DK_IF; + DirectiveKindMap[".ifeq"] = DK_IFEQ; + DirectiveKindMap[".ifge"] = DK_IFGE; + DirectiveKindMap[".ifgt"] = DK_IFGT; + DirectiveKindMap[".ifle"] = DK_IFLE; + DirectiveKindMap[".iflt"] = DK_IFLT; + DirectiveKindMap[".ifne"] = DK_IFNE; + DirectiveKindMap[".ifb"] = DK_IFB; + DirectiveKindMap[".ifnb"] = DK_IFNB; + DirectiveKindMap[".ifc"] = DK_IFC; + DirectiveKindMap[".ifeqs"] = DK_IFEQS; + DirectiveKindMap[".ifnc"] = DK_IFNC; + DirectiveKindMap[".ifnes"] = DK_IFNES; + DirectiveKindMap[".ifdef"] = DK_IFDEF; + DirectiveKindMap[".ifndef"] = DK_IFNDEF; + DirectiveKindMap[".ifnotdef"] = DK_IFNOTDEF; + DirectiveKindMap[".elseif"] = DK_ELSEIF; + DirectiveKindMap[".else"] = DK_ELSE; + DirectiveKindMap[".end"] = DK_END; + DirectiveKindMap[".endif"] = DK_ENDIF; + DirectiveKindMap[".skip"] = DK_SKIP; + DirectiveKindMap[".space"] = DK_SPACE; + DirectiveKindMap[".file"] = DK_FILE; + DirectiveKindMap[".line"] = DK_LINE; + DirectiveKindMap[".loc"] = DK_LOC; + DirectiveKindMap[".stabs"] = DK_STABS; + DirectiveKindMap[".sleb128"] = DK_SLEB128; + DirectiveKindMap[".uleb128"] = DK_ULEB128; + DirectiveKindMap[".cfi_sections"] = DK_CFI_SECTIONS; + DirectiveKindMap[".cfi_startproc"] = DK_CFI_STARTPROC; + DirectiveKindMap[".cfi_endproc"] = DK_CFI_ENDPROC; + DirectiveKindMap[".cfi_def_cfa"] = DK_CFI_DEF_CFA; + DirectiveKindMap[".cfi_def_cfa_offset"] = DK_CFI_DEF_CFA_OFFSET; + DirectiveKindMap[".cfi_adjust_cfa_offset"] = DK_CFI_ADJUST_CFA_OFFSET; + DirectiveKindMap[".cfi_def_cfa_register"] = DK_CFI_DEF_CFA_REGISTER; + DirectiveKindMap[".cfi_offset"] = DK_CFI_OFFSET; + DirectiveKindMap[".cfi_rel_offset"] = DK_CFI_REL_OFFSET; + DirectiveKindMap[".cfi_personality"] = DK_CFI_PERSONALITY; + DirectiveKindMap[".cfi_lsda"] = DK_CFI_LSDA; + DirectiveKindMap[".cfi_remember_state"] = DK_CFI_REMEMBER_STATE; + DirectiveKindMap[".cfi_restore_state"] = DK_CFI_RESTORE_STATE; + DirectiveKindMap[".cfi_same_value"] = DK_CFI_SAME_VALUE; + DirectiveKindMap[".cfi_restore"] = DK_CFI_RESTORE; + DirectiveKindMap[".cfi_escape"] = DK_CFI_ESCAPE; + DirectiveKindMap[".cfi_signal_frame"] = DK_CFI_SIGNAL_FRAME; + DirectiveKindMap[".cfi_undefined"] = DK_CFI_UNDEFINED; + DirectiveKindMap[".cfi_register"] = DK_CFI_REGISTER; + DirectiveKindMap[".cfi_window_save"] = DK_CFI_WINDOW_SAVE; + DirectiveKindMap[".macros_on"] = DK_MACROS_ON; + DirectiveKindMap[".macros_off"] = DK_MACROS_OFF; + DirectiveKindMap[".macro"] = DK_MACRO; + DirectiveKindMap[".exitm"] = DK_EXITM; + DirectiveKindMap[".endm"] = DK_ENDM; + DirectiveKindMap[".endmacro"] = DK_ENDMACRO; + DirectiveKindMap[".purgem"] = DK_PURGEM; + DirectiveKindMap[".err"] = DK_ERR; + DirectiveKindMap[".error"] = DK_ERROR; + DirectiveKindMap[".warning"] = DK_WARNING; + DirectiveKindMap[".reloc"] = DK_RELOC; +} + +MCAsmMacro *AsmParser::parseMacroLikeBody(SMLoc DirectiveLoc) { + AsmToken EndToken, StartToken = getTok(); + + unsigned NestLevel = 0; + for (;;) { + // Check whether we have reached the end of the file. + if (getLexer().is(AsmToken::Eof)) { + Error(DirectiveLoc, "no matching '.endr' in definition"); + return nullptr; + } + + if (Lexer.is(AsmToken::Identifier) && + (getTok().getIdentifier() == ".rept")) { + ++NestLevel; + } + + // Otherwise, check whether we have reached the .endr. + if (Lexer.is(AsmToken::Identifier) && getTok().getIdentifier() == ".endr") { + if (NestLevel == 0) { + EndToken = getTok(); + Lex(); + if (Lexer.isNot(AsmToken::EndOfStatement)) { + TokError("unexpected token in '.endr' directive"); + return nullptr; + } + break; + } + --NestLevel; + } + + // Otherwise, scan till the end of the statement. + eatToEndOfStatement(); + } + + const char *BodyStart = StartToken.getLoc().getPointer(); + const char *BodyEnd = EndToken.getLoc().getPointer(); + StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart); + + // We Are Anonymous. + MacroLikeBodies.emplace_back(StringRef(), Body, MCAsmMacroParameters()); + return &MacroLikeBodies.back(); +} + +void AsmParser::instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc, + raw_svector_ostream &OS) { + OS << ".endr\n"; + + std::unique_ptr<MemoryBuffer> Instantiation = + MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>"); + + // Create the macro instantiation object and add to the current macro + // instantiation stack. + MacroInstantiation *MI = new MacroInstantiation( + DirectiveLoc, CurBuffer, getTok().getLoc(), TheCondStack.size()); + ActiveMacros.push_back(MI); + + // Jump to the macro instantiation and prime the lexer. + CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc()); + Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); + Lex(); +} + +/// parseDirectiveRept +/// ::= .rep | .rept count +bool AsmParser::parseDirectiveRept(SMLoc DirectiveLoc, StringRef Dir) { + const MCExpr *CountExpr; + SMLoc CountLoc = getTok().getLoc(); + if (parseExpression(CountExpr)) + return true; + + int64_t Count; + if (!CountExpr->evaluateAsAbsolute(Count)) { + eatToEndOfStatement(); + return Error(CountLoc, "unexpected token in '" + Dir + "' directive"); + } + + if (Count < 0) + return Error(CountLoc, "Count is negative"); + + if (Lexer.isNot(AsmToken::EndOfStatement)) + return TokError("unexpected token in '" + Dir + "' directive"); + + // Eat the end of statement. + Lex(); + + // Lex the rept definition. + MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); + if (!M) + return true; + + // Macro instantiation is lexical, unfortunately. We construct a new buffer + // to hold the macro body with substitutions. + SmallString<256> Buf; + raw_svector_ostream OS(Buf); + while (Count--) { + // Note that the AtPseudoVariable is disabled for instantiations of .rep(t). + if (expandMacro(OS, M->Body, None, None, false, getTok().getLoc())) + return true; + } + instantiateMacroLikeBody(M, DirectiveLoc, OS); + + return false; +} + +/// parseDirectiveIrp +/// ::= .irp symbol,values +bool AsmParser::parseDirectiveIrp(SMLoc DirectiveLoc) { + MCAsmMacroParameter Parameter; + + if (parseIdentifier(Parameter.Name)) + return TokError("expected identifier in '.irp' directive"); + + if (Lexer.isNot(AsmToken::Comma)) + return TokError("expected comma in '.irp' directive"); + + Lex(); + + MCAsmMacroArguments A; + if (parseMacroArguments(nullptr, A)) + return true; + + // Eat the end of statement. + Lex(); + + // Lex the irp definition. + MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); + if (!M) + return true; + + // Macro instantiation is lexical, unfortunately. We construct a new buffer + // to hold the macro body with substitutions. + SmallString<256> Buf; + raw_svector_ostream OS(Buf); + + for (const MCAsmMacroArgument &Arg : A) { + // Note that the AtPseudoVariable is enabled for instantiations of .irp. + // This is undocumented, but GAS seems to support it. + if (expandMacro(OS, M->Body, Parameter, Arg, true, getTok().getLoc())) + return true; + } + + instantiateMacroLikeBody(M, DirectiveLoc, OS); + + return false; +} + +/// parseDirectiveIrpc +/// ::= .irpc symbol,values +bool AsmParser::parseDirectiveIrpc(SMLoc DirectiveLoc) { + MCAsmMacroParameter Parameter; + + if (parseIdentifier(Parameter.Name)) + return TokError("expected identifier in '.irpc' directive"); + + if (Lexer.isNot(AsmToken::Comma)) + return TokError("expected comma in '.irpc' directive"); + + Lex(); + + MCAsmMacroArguments A; + if (parseMacroArguments(nullptr, A)) + return true; + + if (A.size() != 1 || A.front().size() != 1) + return TokError("unexpected token in '.irpc' directive"); + + // Eat the end of statement. + Lex(); + + // Lex the irpc definition. + MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); + if (!M) + return true; + + // Macro instantiation is lexical, unfortunately. We construct a new buffer + // to hold the macro body with substitutions. + SmallString<256> Buf; + raw_svector_ostream OS(Buf); + + StringRef Values = A.front().front().getString(); + for (std::size_t I = 0, End = Values.size(); I != End; ++I) { + MCAsmMacroArgument Arg; + Arg.emplace_back(AsmToken::Identifier, Values.slice(I, I + 1)); + + // Note that the AtPseudoVariable is enabled for instantiations of .irpc. + // This is undocumented, but GAS seems to support it. + if (expandMacro(OS, M->Body, Parameter, Arg, true, getTok().getLoc())) + return true; + } + + instantiateMacroLikeBody(M, DirectiveLoc, OS); + + return false; +} + +bool AsmParser::parseDirectiveEndr(SMLoc DirectiveLoc) { + if (ActiveMacros.empty()) + return TokError("unmatched '.endr' directive"); + + // The only .repl that should get here are the ones created by + // instantiateMacroLikeBody. + assert(getLexer().is(AsmToken::EndOfStatement)); + + handleMacroExit(); + return false; +} + +bool AsmParser::parseDirectiveMSEmit(SMLoc IDLoc, ParseStatementInfo &Info, + size_t Len) { + const MCExpr *Value; + SMLoc ExprLoc = getLexer().getLoc(); + if (parseExpression(Value)) + return true; + const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value); + if (!MCE) + return Error(ExprLoc, "unexpected expression in _emit"); + uint64_t IntValue = MCE->getValue(); + if (!isUInt<8>(IntValue) && !isInt<8>(IntValue)) + return Error(ExprLoc, "literal value out of range for directive"); + + Info.AsmRewrites->emplace_back(AOK_Emit, IDLoc, Len); + return false; +} + +bool AsmParser::parseDirectiveMSAlign(SMLoc IDLoc, ParseStatementInfo &Info) { + const MCExpr *Value; + SMLoc ExprLoc = getLexer().getLoc(); + if (parseExpression(Value)) + return true; + const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value); + if (!MCE) + return Error(ExprLoc, "unexpected expression in align"); + uint64_t IntValue = MCE->getValue(); + if (!isPowerOf2_64(IntValue)) + return Error(ExprLoc, "literal value not a power of two greater then zero"); + + Info.AsmRewrites->emplace_back(AOK_Align, IDLoc, 5, Log2_64(IntValue)); + return false; +} + +// We are comparing pointers, but the pointers are relative to a single string. +// Thus, this should always be deterministic. +static int rewritesSort(const AsmRewrite *AsmRewriteA, + const AsmRewrite *AsmRewriteB) { + if (AsmRewriteA->Loc.getPointer() < AsmRewriteB->Loc.getPointer()) + return -1; + if (AsmRewriteB->Loc.getPointer() < AsmRewriteA->Loc.getPointer()) + return 1; + + // It's possible to have a SizeDirective, Imm/ImmPrefix and an Input/Output + // rewrite to the same location. Make sure the SizeDirective rewrite is + // performed first, then the Imm/ImmPrefix and finally the Input/Output. This + // ensures the sort algorithm is stable. + if (AsmRewritePrecedence[AsmRewriteA->Kind] > + AsmRewritePrecedence[AsmRewriteB->Kind]) + return -1; + + if (AsmRewritePrecedence[AsmRewriteA->Kind] < + AsmRewritePrecedence[AsmRewriteB->Kind]) + return 1; + llvm_unreachable("Unstable rewrite sort."); +} + +bool AsmParser::parseMSInlineAsm( + void *AsmLoc, std::string &AsmString, unsigned &NumOutputs, + unsigned &NumInputs, SmallVectorImpl<std::pair<void *, bool> > &OpDecls, + SmallVectorImpl<std::string> &Constraints, + SmallVectorImpl<std::string> &Clobbers, const MCInstrInfo *MII, + const MCInstPrinter *IP, MCAsmParserSemaCallback &SI) { + SmallVector<void *, 4> InputDecls; + SmallVector<void *, 4> OutputDecls; + SmallVector<bool, 4> InputDeclsAddressOf; + SmallVector<bool, 4> OutputDeclsAddressOf; + SmallVector<std::string, 4> InputConstraints; + SmallVector<std::string, 4> OutputConstraints; + SmallVector<unsigned, 4> ClobberRegs; + + SmallVector<AsmRewrite, 4> AsmStrRewrites; + + // Prime the lexer. + Lex(); + + // While we have input, parse each statement. + unsigned InputIdx = 0; + unsigned OutputIdx = 0; + while (getLexer().isNot(AsmToken::Eof)) { + ParseStatementInfo Info(&AsmStrRewrites); + if (parseStatement(Info, &SI)) + return true; + + if (Info.ParseError) + return true; + + if (Info.Opcode == ~0U) + continue; + + const MCInstrDesc &Desc = MII->get(Info.Opcode); + + // Build the list of clobbers, outputs and inputs. + for (unsigned i = 1, e = Info.ParsedOperands.size(); i != e; ++i) { + MCParsedAsmOperand &Operand = *Info.ParsedOperands[i]; + + // Immediate. + if (Operand.isImm()) + continue; + + // Register operand. + if (Operand.isReg() && !Operand.needAddressOf() && + !getTargetParser().OmitRegisterFromClobberLists(Operand.getReg())) { + unsigned NumDefs = Desc.getNumDefs(); + // Clobber. + if (NumDefs && Operand.getMCOperandNum() < NumDefs) + ClobberRegs.push_back(Operand.getReg()); + continue; + } + + // Expr/Input or Output. + StringRef SymName = Operand.getSymName(); + if (SymName.empty()) + continue; + + void *OpDecl = Operand.getOpDecl(); + if (!OpDecl) + continue; + + bool isOutput = (i == 1) && Desc.mayStore(); + SMLoc Start = SMLoc::getFromPointer(SymName.data()); + if (isOutput) { + ++InputIdx; + OutputDecls.push_back(OpDecl); + OutputDeclsAddressOf.push_back(Operand.needAddressOf()); + OutputConstraints.push_back(("=" + Operand.getConstraint()).str()); + AsmStrRewrites.emplace_back(AOK_Output, Start, SymName.size()); + } else { + InputDecls.push_back(OpDecl); + InputDeclsAddressOf.push_back(Operand.needAddressOf()); + InputConstraints.push_back(Operand.getConstraint().str()); + AsmStrRewrites.emplace_back(AOK_Input, Start, SymName.size()); + } + } + + // Consider implicit defs to be clobbers. Think of cpuid and push. + ArrayRef<MCPhysReg> ImpDefs(Desc.getImplicitDefs(), + Desc.getNumImplicitDefs()); + ClobberRegs.insert(ClobberRegs.end(), ImpDefs.begin(), ImpDefs.end()); + } + + // Set the number of Outputs and Inputs. + NumOutputs = OutputDecls.size(); + NumInputs = InputDecls.size(); + + // Set the unique clobbers. + array_pod_sort(ClobberRegs.begin(), ClobberRegs.end()); + ClobberRegs.erase(std::unique(ClobberRegs.begin(), ClobberRegs.end()), + ClobberRegs.end()); + Clobbers.assign(ClobberRegs.size(), std::string()); + for (unsigned I = 0, E = ClobberRegs.size(); I != E; ++I) { + raw_string_ostream OS(Clobbers[I]); + IP->printRegName(OS, ClobberRegs[I]); + } + + // Merge the various outputs and inputs. Output are expected first. + if (NumOutputs || NumInputs) { + unsigned NumExprs = NumOutputs + NumInputs; + OpDecls.resize(NumExprs); + Constraints.resize(NumExprs); + for (unsigned i = 0; i < NumOutputs; ++i) { + OpDecls[i] = std::make_pair(OutputDecls[i], OutputDeclsAddressOf[i]); + Constraints[i] = OutputConstraints[i]; + } + for (unsigned i = 0, j = NumOutputs; i < NumInputs; ++i, ++j) { + OpDecls[j] = std::make_pair(InputDecls[i], InputDeclsAddressOf[i]); + Constraints[j] = InputConstraints[i]; + } + } + + // Build the IR assembly string. + std::string AsmStringIR; + raw_string_ostream OS(AsmStringIR); + StringRef ASMString = + SrcMgr.getMemoryBuffer(SrcMgr.getMainFileID())->getBuffer(); + const char *AsmStart = ASMString.begin(); + const char *AsmEnd = ASMString.end(); + array_pod_sort(AsmStrRewrites.begin(), AsmStrRewrites.end(), rewritesSort); + for (const AsmRewrite &AR : AsmStrRewrites) { + AsmRewriteKind Kind = AR.Kind; + if (Kind == AOK_Delete) + continue; + + const char *Loc = AR.Loc.getPointer(); + assert(Loc >= AsmStart && "Expected Loc to be at or after Start!"); + + // Emit everything up to the immediate/expression. + if (unsigned Len = Loc - AsmStart) + OS << StringRef(AsmStart, Len); + + // Skip the original expression. + if (Kind == AOK_Skip) { + AsmStart = Loc + AR.Len; + continue; + } + + unsigned AdditionalSkip = 0; + // Rewrite expressions in $N notation. + switch (Kind) { + default: + break; + case AOK_Imm: + OS << "$$" << AR.Val; + break; + case AOK_ImmPrefix: + OS << "$$"; + break; + case AOK_Label: + OS << Ctx.getAsmInfo()->getPrivateLabelPrefix() << AR.Label; + break; + case AOK_Input: + OS << '$' << InputIdx++; + break; + case AOK_Output: + OS << '$' << OutputIdx++; + break; + case AOK_SizeDirective: + switch (AR.Val) { + default: break; + case 8: OS << "byte ptr "; break; + case 16: OS << "word ptr "; break; + case 32: OS << "dword ptr "; break; + case 64: OS << "qword ptr "; break; + case 80: OS << "xword ptr "; break; + case 128: OS << "xmmword ptr "; break; + case 256: OS << "ymmword ptr "; break; + } + break; + case AOK_Emit: + OS << ".byte"; + break; + case AOK_Align: { + // MS alignment directives are measured in bytes. If the native assembler + // measures alignment in bytes, we can pass it straight through. + OS << ".align"; + if (getContext().getAsmInfo()->getAlignmentIsInBytes()) + break; + + // Alignment is in log2 form, so print that instead and skip the original + // immediate. + unsigned Val = AR.Val; + OS << ' ' << Val; + assert(Val < 10 && "Expected alignment less then 2^10."); + AdditionalSkip = (Val < 4) ? 2 : Val < 7 ? 3 : 4; + break; + } + case AOK_EVEN: + OS << ".even"; + break; + case AOK_DotOperator: + // Insert the dot if the user omitted it. + OS.flush(); + if (AsmStringIR.back() != '.') + OS << '.'; + OS << AR.Val; + break; + } + + // Skip the original expression. + AsmStart = Loc + AR.Len + AdditionalSkip; + } + + // Emit the remainder of the asm string. + if (AsmStart != AsmEnd) + OS << StringRef(AsmStart, AsmEnd - AsmStart); + + AsmString = OS.str(); + return false; +} + +namespace llvm { +namespace MCParserUtils { + +/// Returns whether the given symbol is used anywhere in the given expression, +/// or subexpressions. +static bool isSymbolUsedInExpression(const MCSymbol *Sym, const MCExpr *Value) { + switch (Value->getKind()) { + case MCExpr::Binary: { + const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(Value); + return isSymbolUsedInExpression(Sym, BE->getLHS()) || + isSymbolUsedInExpression(Sym, BE->getRHS()); + } + case MCExpr::Target: + case MCExpr::Constant: + return false; + case MCExpr::SymbolRef: { + const MCSymbol &S = + static_cast<const MCSymbolRefExpr *>(Value)->getSymbol(); + if (S.isVariable()) + return isSymbolUsedInExpression(Sym, S.getVariableValue()); + return &S == Sym; + } + case MCExpr::Unary: + return isSymbolUsedInExpression( + Sym, static_cast<const MCUnaryExpr *>(Value)->getSubExpr()); + } + + llvm_unreachable("Unknown expr kind!"); +} + +bool parseAssignmentExpression(StringRef Name, bool allow_redef, + MCAsmParser &Parser, MCSymbol *&Sym, + const MCExpr *&Value) { + MCAsmLexer &Lexer = Parser.getLexer(); + + // FIXME: Use better location, we should use proper tokens. + SMLoc EqualLoc = Lexer.getLoc(); + + if (Parser.parseExpression(Value)) { + Parser.TokError("missing expression"); + Parser.eatToEndOfStatement(); + return true; + } + + // Note: we don't count b as used in "a = b". This is to allow + // a = b + // b = c + + if (Lexer.isNot(AsmToken::EndOfStatement)) + return Parser.TokError("unexpected token in assignment"); + + // Eat the end of statement marker. + Parser.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). + Sym = Parser.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 (isSymbolUsedInExpression(Sym, Value)) + return Parser.Error(EqualLoc, "Recursive use of '" + Name + "'"); + else if (Sym->isUndefined(/*SetUsed*/ false) && !Sym->isUsed() && + !Sym->isVariable()) + ; // Allow redefinitions of undefined symbols only used in directives. + else if (Sym->isVariable() && !Sym->isUsed() && allow_redef) + ; // Allow redefinitions of variables that haven't yet been used. + else if (!Sym->isUndefined() && (!Sym->isVariable() || !allow_redef)) + return Parser.Error(EqualLoc, "redefinition of '" + Name + "'"); + else if (!Sym->isVariable()) + return Parser.Error(EqualLoc, "invalid assignment to '" + Name + "'"); + else if (!isa<MCConstantExpr>(Sym->getVariableValue())) + return Parser.Error(EqualLoc, + "invalid reassignment of non-absolute variable '" + + Name + "'"); + } else if (Name == ".") { + Parser.getStreamer().emitValueToOffset(Value, 0); + return false; + } else + Sym = Parser.getContext().getOrCreateSymbol(Name); + + Sym->setRedefinable(allow_redef); + + return false; +} + +} // namespace MCParserUtils +} // namespace llvm + +/// \brief Create an MCAsmParser instance. +MCAsmParser *llvm::createMCAsmParser(SourceMgr &SM, MCContext &C, + MCStreamer &Out, const MCAsmInfo &MAI) { + return new AsmParser(SM, C, Out, MAI); +} |
