MasmParser.cpp

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//===- AsmParser.cpp - Parser for Assembly Files --------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This class implements the parser for assembly files.
//
//===----------------------------------------------------------------------===//
 
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCCodeView.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDirectives.h"
#include "llvm/MC/MCDwarf.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCParser/AsmCond.h"
#include "llvm/MC/MCParser/AsmLexer.h"
#include "llvm/MC/MCParser/MCAsmLexer.h"
#include "llvm/MC/MCParser/MCAsmParser.h"
#include "llvm/MC/MCParser/MCAsmParserExtension.h"
#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
#include "llvm/MC/MCParser/MCTargetAsmParser.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCTargetOptions.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/MD5.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/SMLoc.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <climits>
#include <cstddef>
#include <cstdint>
#include <ctime>
#include <deque>
#include <memory>
#include <optional>
#include <sstream>
#include <string>
#include <tuple>
#include <utility>
#include <vector>
 
using namespace llvm;
 
namespace {
 
/// Helper types for tracking macro definitions.
typedef std::vector<AsmToken> MCAsmMacroArgument;
typedef std::vector<MCAsmMacroArgument> MCAsmMacroArguments;
 
/// 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.
  unsigned 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;
};
 
struct ParseStatementInfo {
  /// The parsed operands from the last parsed statement.
  SmallVector<std::unique_ptr<MCParsedAsmOperand>, 8> ParsedOperands;
 
  /// The opcode from the last parsed instruction.
  unsigned Opcode = ~0U;
 
  /// Was there an error parsing the inline assembly?
  bool ParseError = false;
 
  /// The value associated with a macro exit.
  std::optional<std::string> ExitValue;
 
  SmallVectorImpl<AsmRewrite> *AsmRewrites = nullptr;
 
  ParseStatementInfo() = delete;
  ParseStatementInfo(SmallVectorImpl<AsmRewrite> *rewrites)
      : AsmRewrites(rewrites) {}
};
 
enum FieldType {
  FT_INTEGRAL, // Initializer: integer expression, stored as an MCExpr.
  FT_REAL,     // Initializer: real number, stored as an APInt.
  FT_STRUCT    // Initializer: struct initializer, stored recursively.
};
 
struct FieldInfo;
struct StructInfo {
  StringRef Name;
  bool IsUnion = false;
  bool Initializable = true;
  unsigned Alignment = 0;
  unsigned AlignmentSize = 0;
  unsigned NextOffset = 0;
  unsigned Size = 0;
  std::vector<FieldInfo> Fields;
  StringMap<size_t> FieldsByName;
 
  FieldInfo &addField(StringRef FieldName, FieldType FT,
                      unsigned FieldAlignmentSize);
 
  StructInfo() = default;
  StructInfo(StringRef StructName, bool Union, unsigned AlignmentValue);
};
 
// FIXME: This should probably use a class hierarchy, raw pointers between the
// objects, and dynamic type resolution instead of a union. On the other hand,
// ownership then becomes much more complicated; the obvious thing would be to
// use BumpPtrAllocator, but the lack of a destructor makes that messy.
 
struct StructInitializer;
struct IntFieldInfo {
  SmallVector<const MCExpr *, 1> Values;
 
  IntFieldInfo() = default;
  IntFieldInfo(const SmallVector<const MCExpr *, 1> &V) { Values = V; }
  IntFieldInfo(SmallVector<const MCExpr *, 1> &&V) { Values = std::move(V); }
};
struct RealFieldInfo {
  SmallVector<APInt, 1> AsIntValues;
 
  RealFieldInfo() = default;
  RealFieldInfo(const SmallVector<APInt, 1> &V) { AsIntValues = V; }
  RealFieldInfo(SmallVector<APInt, 1> &&V) { AsIntValues = std::move(V); }
};
struct StructFieldInfo {
  std::vector<StructInitializer> Initializers;
  StructInfo Structure;
 
  StructFieldInfo() = default;
  StructFieldInfo(std::vector<StructInitializer> V, StructInfo S);
};
 
class FieldInitializer {
public:
  FieldType FT;
  union {
    IntFieldInfo IntInfo;
    RealFieldInfo RealInfo;
    StructFieldInfo StructInfo;
  };
 
  ~FieldInitializer();
  FieldInitializer(FieldType FT);
 
  FieldInitializer(SmallVector<const MCExpr *, 1> &&Values);
  FieldInitializer(SmallVector<APInt, 1> &&AsIntValues);
  FieldInitializer(std::vector<StructInitializer> &&Initializers,
                   struct StructInfo Structure);
 
  FieldInitializer(const FieldInitializer &Initializer);
  FieldInitializer(FieldInitializer &&Initializer);
 
  FieldInitializer &operator=(const FieldInitializer &Initializer);
  FieldInitializer &operator=(FieldInitializer &&Initializer);
};
 
struct StructInitializer {
  std::vector<FieldInitializer> FieldInitializers;
};
 
struct FieldInfo {
  // Offset of the field within the containing STRUCT.
  unsigned Offset = 0;
 
  // Total size of the field (= LengthOf * Type).
  unsigned SizeOf = 0;
 
  // Number of elements in the field (1 if scalar, >1 if an array).
  unsigned LengthOf = 0;
 
  // Size of a single entry in this field, in bytes ("type" in MASM standards).
  unsigned Type = 0;
 
  FieldInitializer Contents;
 
  FieldInfo(FieldType FT) : Contents(FT) {}
};
 
StructFieldInfo::StructFieldInfo(std::vector<StructInitializer> V,
                                 StructInfo S) {
  Initializers = std::move(V);
  Structure = S;
}
 
StructInfo::StructInfo(StringRef StructName, bool Union,
                       unsigned AlignmentValue)
    : Name(StructName), IsUnion(Union), Alignment(AlignmentValue) {}
 
FieldInfo &StructInfo::addField(StringRef FieldName, FieldType FT,
                                unsigned FieldAlignmentSize) {
  if (!FieldName.empty())
    FieldsByName[FieldName.lower()] = Fields.size();
  Fields.emplace_back(FT);
  FieldInfo &Field = Fields.back();
  Field.Offset =
      llvm::alignTo(NextOffset, std::min(Alignment, FieldAlignmentSize));
  if (!IsUnion) {
    NextOffset = std::max(NextOffset, Field.Offset);
  }
  AlignmentSize = std::max(AlignmentSize, FieldAlignmentSize);
  return Field;
}
 
FieldInitializer::~FieldInitializer() {
  switch (FT) {
  case FT_INTEGRAL:
    IntInfo.~IntFieldInfo();
    break;
  case FT_REAL:
    RealInfo.~RealFieldInfo();
    break;
  case FT_STRUCT:
    StructInfo.~StructFieldInfo();
    break;
  }
}
 
FieldInitializer::FieldInitializer(FieldType FT) : FT(FT) {
  switch (FT) {
  case FT_INTEGRAL:
    new (&IntInfo) IntFieldInfo();
    break;
  case FT_REAL:
    new (&RealInfo) RealFieldInfo();
    break;
  case FT_STRUCT:
    new (&StructInfo) StructFieldInfo();
    break;
  }
}
 
FieldInitializer::FieldInitializer(SmallVector<const MCExpr *, 1> &&Values)
    : FT(FT_INTEGRAL) {
  new (&IntInfo) IntFieldInfo(std::move(Values));
}
 
FieldInitializer::FieldInitializer(SmallVector<APInt, 1> &&AsIntValues)
    : FT(FT_REAL) {
  new (&RealInfo) RealFieldInfo(std::move(AsIntValues));
}
 
FieldInitializer::FieldInitializer(
    std::vector<StructInitializer> &&Initializers, struct StructInfo Structure)
    : FT(FT_STRUCT) {
  new (&StructInfo) StructFieldInfo(std::move(Initializers), Structure);
}
 
FieldInitializer::FieldInitializer(const FieldInitializer &Initializer)
    : FT(Initializer.FT) {
  switch (FT) {
  case FT_INTEGRAL:
    new (&IntInfo) IntFieldInfo(Initializer.IntInfo);
    break;
  case FT_REAL:
    new (&RealInfo) RealFieldInfo(Initializer.RealInfo);
    break;
  case FT_STRUCT:
    new (&StructInfo) StructFieldInfo(Initializer.StructInfo);
    break;
  }
}
 
FieldInitializer::FieldInitializer(FieldInitializer &&Initializer)
    : FT(Initializer.FT) {
  switch (FT) {
  case FT_INTEGRAL:
    new (&IntInfo) IntFieldInfo(Initializer.IntInfo);
    break;
  case FT_REAL:
    new (&RealInfo) RealFieldInfo(Initializer.RealInfo);
    break;
  case FT_STRUCT:
    new (&StructInfo) StructFieldInfo(Initializer.StructInfo);
    break;
  }
}
 
FieldInitializer &
FieldInitializer::operator=(const FieldInitializer &Initializer) {
  if (FT != Initializer.FT) {
    switch (FT) {
    case FT_INTEGRAL:
      IntInfo.~IntFieldInfo();
      break;
    case FT_REAL:
      RealInfo.~RealFieldInfo();
      break;
    case FT_STRUCT:
      StructInfo.~StructFieldInfo();
      break;
    }
  }
  FT = Initializer.FT;
  switch (FT) {
  case FT_INTEGRAL:
    IntInfo = Initializer.IntInfo;
    break;
  case FT_REAL:
    RealInfo = Initializer.RealInfo;
    break;
  case FT_STRUCT:
    StructInfo = Initializer.StructInfo;
    break;
  }
  return *this;
}
 
FieldInitializer &FieldInitializer::operator=(FieldInitializer &&Initializer) {
  if (FT != Initializer.FT) {
    switch (FT) {
    case FT_INTEGRAL:
      IntInfo.~IntFieldInfo();
      break;
    case FT_REAL:
      RealInfo.~RealFieldInfo();
      break;
    case FT_STRUCT:
      StructInfo.~StructFieldInfo();
      break;
    }
  }
  FT = Initializer.FT;
  switch (FT) {
  case FT_INTEGRAL:
    IntInfo = Initializer.IntInfo;
    break;
  case FT_REAL:
    RealInfo = Initializer.RealInfo;
    break;
  case FT_STRUCT:
    StructInfo = Initializer.StructInfo;
    break;
  }
  return *this;
}
 
/// The concrete assembly parser instance.
// Note that this is a full MCAsmParser, not an MCAsmParserExtension!
// It's a peer of AsmParser, not of COFFAsmParser, WasmAsmParser, etc.
class MasmParser : public MCAsmParser {
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;
 
  /// time of assembly
  struct tm TM;
 
  BitVector EndStatementAtEOFStack;
 
  AsmCond TheCondState;
  std::vector<AsmCond> TheCondStack;
 
  /// maps directive names to handler methods in parser
  /// extensions. Extensions register themselves in this map by calling
  /// addDirectiveHandler.
  StringMap<ExtensionDirectiveHandler> ExtensionDirectiveMap;
 
  /// maps assembly-time variable names to variables.
  struct Variable {
    enum RedefinableKind { NOT_REDEFINABLE, WARN_ON_REDEFINITION, REDEFINABLE };
 
    StringRef Name;
    RedefinableKind Redefinable = REDEFINABLE;
    bool IsText = false;
    std::string TextValue;
  };
  StringMap<Variable> Variables;
 
  /// Stack of active struct definitions.
  SmallVector<StructInfo, 1> StructInProgress;
 
  /// Maps struct tags to struct definitions.
  StringMap<StructInfo> Structs;
 
  /// Maps data location names to types.
  StringMap<AsmTypeInfo> KnownType;
 
  /// Stack of active macro instantiations.
  std::vector<MacroInstantiation*> ActiveMacros;
 
  /// List of bodies of anonymous macros.
  std::deque<MCAsmMacro> MacroLikeBodies;
 
  /// Keeps track of how many .macro's have been instantiated.
  unsigned NumOfMacroInstantiations;
 
  /// The values from the last parsed cpp hash file line comment if any.
  struct CppHashInfoTy {
    StringRef Filename;
    int64_t LineNumber;
    SMLoc Loc;
    unsigned Buf;
    CppHashInfoTy() : LineNumber(0), Buf(0) {}
  };
  CppHashInfoTy CppHashInfo;
 
  /// The filename from the first cpp hash file line comment, if any.
  StringRef FirstCppHashFilename;
 
  /// List of forward directional labels for diagnosis at the end.
  SmallVector<std::tuple<SMLoc, CppHashInfoTy, MCSymbol *>, 4> DirLabels;
 
  /// AssemblerDialect. ~OU means unset value and use value provided by MAI.
  /// Defaults to 1U, meaning Intel.
  unsigned AssemblerDialect = 1U;
 
  /// is Darwin compatibility enabled?
  bool IsDarwin = false;
 
  /// Are we parsing ms-style inline assembly?
  bool ParsingMSInlineAsm = false;
 
  /// Did we already inform the user about inconsistent MD5 usage?
  bool ReportedInconsistentMD5 = false;
 
  // Current <...> expression depth.
  unsigned AngleBracketDepth = 0U;
 
  // Number of locals defined.
  uint16_t LocalCounter = 0;
 
public:
  MasmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
             const MCAsmInfo &MAI, struct tm TM, unsigned CB = 0);
  MasmParser(const MasmParser &) = delete;
  MasmParser &operator=(const MasmParser &) = delete;
  ~MasmParser() override;
 
  bool Run(bool NoInitialTextSection, bool NoFinalize = false) override;
 
  void addDirectiveHandler(StringRef Directive,
                           ExtensionDirectiveHandler Handler) override {
    ExtensionDirectiveMap[Directive] = Handler;
    DirectiveKindMap.try_emplace(Directive, DK_HANDLER_DIRECTIVE);
  }
 
  void addAliasForDirective(StringRef Directive, StringRef Alias) override {
    DirectiveKindMap[Directive] = DirectiveKindMap[Alias];
  }
 
  /// @name MCAsmParser Interface
  /// {
 
  SourceMgr &getSourceManager() override { return SrcMgr; }
  MCAsmLexer &getLexer() override { return Lexer; }
  MCContext &getContext() override { return Ctx; }
  MCStreamer &getStreamer() override { return Out; }
 
  CodeViewContext &getCVContext() { return Ctx.getCVContext(); }
 
  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, SMRange Range = std::nullopt) override;
  bool Warning(SMLoc L, const Twine &Msg,
               SMRange Range = std::nullopt) override;
  bool printError(SMLoc L, const Twine &Msg,
                  SMRange Range = std::nullopt) override;
 
  enum ExpandKind { ExpandMacros, DoNotExpandMacros };
  const AsmToken &Lex(ExpandKind ExpandNextToken);
  const AsmToken &Lex() override { return Lex(ExpandMacros); }
 
  void setParsingMSInlineAsm(bool V) override {
    ParsingMSInlineAsm = V;
    // When parsing MS inline asm, we must lex 0b1101 and 0ABCH as binary and
    // hex integer literals.
    Lexer.setLexMasmIntegers(V);
  }
  bool isParsingMSInlineAsm() override { return ParsingMSInlineAsm; }
 
  bool isParsingMasm() const override { return true; }
 
  bool defineMacro(StringRef Name, StringRef Value) override;
 
  bool lookUpField(StringRef Name, AsmFieldInfo &Info) const override;
  bool lookUpField(StringRef Base, StringRef Member,
                   AsmFieldInfo &Info) const override;
 
  bool lookUpType(StringRef Name, AsmTypeInfo &Info) const override;
 
  bool parseMSInlineAsm(std::string &AsmString, unsigned &NumOutputs,
                        unsigned &NumInputs,
                        SmallVectorImpl<std::pair<void *, bool>> &OpDecls,
                        SmallVectorImpl<std::string> &Constraints,
                        SmallVectorImpl<std::string> &Clobbers,
                        const MCInstrInfo *MII, 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,
                        AsmTypeInfo *TypeInfo) 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;
 
  /// Parse a floating point expression using the float \p Semantics
  /// and set \p Res to the value.
  bool parseRealValue(const fltSemantics &Semantics, APInt &Res);
 
  /// Parse an identifier or string (as a quoted identifier)
  /// and set \p Res to the identifier contents.
  enum IdentifierPositionKind { StandardPosition, StartOfStatement };
  bool parseIdentifier(StringRef &Res, IdentifierPositionKind Position);
  bool parseIdentifier(StringRef &Res) override {
    return parseIdentifier(Res, StandardPosition);
  }
  void eatToEndOfStatement() override;
 
  bool checkForValidSection() override;
 
  /// }
 
private:
  bool expandMacros();
  const AsmToken peekTok(bool ShouldSkipSpace = true);
 
  bool parseStatement(ParseStatementInfo &Info,
                      MCAsmParserSemaCallback *SI);
  bool parseCurlyBlockScope(SmallVectorImpl<AsmRewrite>& AsmStrRewrites);
  bool parseCppHashLineFilenameComment(SMLoc L);
 
  bool expandMacro(raw_svector_ostream &OS, StringRef Body,
                   ArrayRef<MCAsmMacroParameter> Parameters,
                   ArrayRef<MCAsmMacroArgument> A,
                   const std::vector<std::string> &Locals, SMLoc L);
 
  /// Are we inside a macro instantiation?
  bool isInsideMacroInstantiation() {return !ActiveMacros.empty();}
 
  /// Handle entry to macro instantiation.
  ///
  /// \param M The macro.
  /// \param NameLoc Instantiation location.
  bool handleMacroEntry(
      const MCAsmMacro *M, SMLoc NameLoc,
      AsmToken::TokenKind ArgumentEndTok = AsmToken::EndOfStatement);
 
  /// Handle invocation of macro function.
  ///
  /// \param M The macro.
  /// \param NameLoc Invocation location.
  bool handleMacroInvocation(const MCAsmMacro *M, SMLoc NameLoc);
 
  /// Handle exit from macro instantiation.
  void handleMacroExit();
 
  /// Extract AsmTokens for a macro argument.
  bool
  parseMacroArgument(const MCAsmMacroParameter *MP, MCAsmMacroArgument &MA,
                     AsmToken::TokenKind EndTok = AsmToken::EndOfStatement);
 
  /// Parse all macro arguments for a given macro.
  bool
  parseMacroArguments(const MCAsmMacro *M, MCAsmMacroArguments &A,
                      AsmToken::TokenKind EndTok = AsmToken::EndOfStatement);
 
  void printMacroInstantiations();
 
  bool expandStatement(SMLoc Loc);
 
  void printMessage(SMLoc Loc, SourceMgr::DiagKind Kind, const Twine &Msg,
                    SMRange Range = std::nullopt) const {
    ArrayRef<SMRange> Ranges(Range);
    SrcMgr.PrintMessage(Loc, Kind, Msg, Ranges);
  }
  static void DiagHandler(const SMDiagnostic &Diag, void *Context);
 
  bool lookUpField(const StructInfo &Structure, StringRef Member,
                   AsmFieldInfo &Info) const;
 
  /// Should we emit DWARF describing this assembler source?  (Returns false if
  /// the source has .file directives, which means we don't want to generate
  /// info describing the assembler source itself.)
  bool enabledGenDwarfForAssembly();
 
  /// Enter the specified file. This returns true on failure.
  bool enterIncludeFile(const std::string &Filename);
 
  /// 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,
                 bool EndStatementAtEOF = true);
 
  /// Parse up to a token of kind \p EndTok and return the contents from the
  /// current token up to (but not including) this token; the current token on
  /// exit will be either this kind or EOF. Reads through instantiated macro
  /// functions and text macros.
  SmallVector<StringRef, 1> parseStringRefsTo(AsmToken::TokenKind EndTok);
  std::string parseStringTo(AsmToken::TokenKind EndTok);
 
  /// Parse up to the end of statement and 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;
 
  bool parseTextItem(std::string &Data);
 
  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);
 
  bool parseCVFunctionId(int64_t &FunctionId, StringRef DirectiveName);
  bool parseCVFileId(int64_t &FileId, StringRef DirectiveName);
 
  // Generic (target and platform independent) directive parsing.
  enum DirectiveKind {
    DK_NO_DIRECTIVE, // Placeholder
    DK_HANDLER_DIRECTIVE,
    DK_ASSIGN,
    DK_EQU,
    DK_TEXTEQU,
    DK_ASCII,
    DK_ASCIZ,
    DK_STRING,
    DK_BYTE,
    DK_SBYTE,
    DK_WORD,
    DK_SWORD,
    DK_DWORD,
    DK_SDWORD,
    DK_FWORD,
    DK_QWORD,
    DK_SQWORD,
    DK_DB,
    DK_DD,
    DK_DF,
    DK_DQ,
    DK_DW,
    DK_REAL4,
    DK_REAL8,
    DK_REAL10,
    DK_ALIGN,
    DK_EVEN,
    DK_ORG,
    DK_ENDR,
    DK_EXTERN,
    DK_PUBLIC,
    DK_COMM,
    DK_COMMENT,
    DK_INCLUDE,
    DK_REPEAT,
    DK_WHILE,
    DK_FOR,
    DK_FORC,
    DK_IF,
    DK_IFE,
    DK_IFB,
    DK_IFNB,
    DK_IFDEF,
    DK_IFNDEF,
    DK_IFDIF,
    DK_IFDIFI,
    DK_IFIDN,
    DK_IFIDNI,
    DK_ELSEIF,
    DK_ELSEIFE,
    DK_ELSEIFB,
    DK_ELSEIFNB,
    DK_ELSEIFDEF,
    DK_ELSEIFNDEF,
    DK_ELSEIFDIF,
    DK_ELSEIFDIFI,
    DK_ELSEIFIDN,
    DK_ELSEIFIDNI,
    DK_ELSE,
    DK_ENDIF,
    DK_FILE,
    DK_LINE,
    DK_LOC,
    DK_STABS,
    DK_CV_FILE,
    DK_CV_FUNC_ID,
    DK_CV_INLINE_SITE_ID,
    DK_CV_LOC,
    DK_CV_LINETABLE,
    DK_CV_INLINE_LINETABLE,
    DK_CV_DEF_RANGE,
    DK_CV_STRINGTABLE,
    DK_CV_STRING,
    DK_CV_FILECHECKSUMS,
    DK_CV_FILECHECKSUM_OFFSET,
    DK_CV_FPO_DATA,
    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_RETURN_COLUMN,
    DK_CFI_SIGNAL_FRAME,
    DK_CFI_UNDEFINED,
    DK_CFI_REGISTER,
    DK_CFI_WINDOW_SAVE,
    DK_CFI_B_KEY_FRAME,
    DK_MACRO,
    DK_EXITM,
    DK_ENDM,
    DK_PURGE,
    DK_ERR,
    DK_ERRB,
    DK_ERRNB,
    DK_ERRDEF,
    DK_ERRNDEF,
    DK_ERRDIF,
    DK_ERRDIFI,
    DK_ERRIDN,
    DK_ERRIDNI,
    DK_ERRE,
    DK_ERRNZ,
    DK_ECHO,
    DK_STRUCT,
    DK_UNION,
    DK_ENDS,
    DK_END,
    DK_PUSHFRAME,
    DK_PUSHREG,
    DK_SAVEREG,
    DK_SAVEXMM128,
    DK_SETFRAME,
    DK_RADIX,
  };
 
  /// Maps directive name --> DirectiveKind enum, for directives parsed by this
  /// class.
  StringMap<DirectiveKind> DirectiveKindMap;
 
  bool isMacroLikeDirective();
 
  // Codeview def_range type parsing.
  enum CVDefRangeType {
    CVDR_DEFRANGE = 0, // Placeholder
    CVDR_DEFRANGE_REGISTER,
    CVDR_DEFRANGE_FRAMEPOINTER_REL,
    CVDR_DEFRANGE_SUBFIELD_REGISTER,
    CVDR_DEFRANGE_REGISTER_REL
  };
 
  /// Maps Codeview def_range types --> CVDefRangeType enum, for Codeview
  /// def_range types parsed by this class.
  StringMap<CVDefRangeType> CVDefRangeTypeMap;
 
  // Generic (target and platform independent) directive parsing.
  enum BuiltinSymbol {
    BI_NO_SYMBOL, // Placeholder
    BI_DATE,
    BI_TIME,
    BI_VERSION,
    BI_FILECUR,
    BI_FILENAME,
    BI_LINE,
    BI_CURSEG,
    BI_CPU,
    BI_INTERFACE,
    BI_CODE,
    BI_DATA,
    BI_FARDATA,
    BI_WORDSIZE,
    BI_CODESIZE,
    BI_DATASIZE,
    BI_MODEL,
    BI_STACK,
  };
 
  /// Maps builtin name --> BuiltinSymbol enum, for builtins handled by this
  /// class.
  StringMap<BuiltinSymbol> BuiltinSymbolMap;
 
  const MCExpr *evaluateBuiltinValue(BuiltinSymbol Symbol, SMLoc StartLoc);
 
  std::optional<std::string> evaluateBuiltinTextMacro(BuiltinSymbol Symbol,
                                                      SMLoc StartLoc);
 
  // ".ascii", ".asciz", ".string"
  bool parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated);
 
  // "byte", "word", ...
  bool emitIntValue(const MCExpr *Value, unsigned Size);
  bool parseScalarInitializer(unsigned Size,
                              SmallVectorImpl<const MCExpr *> &Values,
                              unsigned StringPadLength = 0);
  bool parseScalarInstList(
      unsigned Size, SmallVectorImpl<const MCExpr *> &Values,
      const AsmToken::TokenKind EndToken = AsmToken::EndOfStatement);
  bool emitIntegralValues(unsigned Size, unsigned *Count = nullptr);
  bool addIntegralField(StringRef Name, unsigned Size);
  bool parseDirectiveValue(StringRef IDVal, unsigned Size);
  bool parseDirectiveNamedValue(StringRef TypeName, unsigned Size,
                                StringRef Name, SMLoc NameLoc);
 
  // "real4", "real8", "real10"
  bool emitRealValues(const fltSemantics &Semantics, unsigned *Count = nullptr);
  bool addRealField(StringRef Name, const fltSemantics &Semantics, size_t Size);
  bool parseDirectiveRealValue(StringRef IDVal, const fltSemantics &Semantics,
                               size_t Size);
  bool parseRealInstList(
      const fltSemantics &Semantics, SmallVectorImpl<APInt> &Values,
      const AsmToken::TokenKind EndToken = AsmToken::EndOfStatement);
  bool parseDirectiveNamedRealValue(StringRef TypeName,
                                    const fltSemantics &Semantics,
                                    unsigned Size, StringRef Name,
                                    SMLoc NameLoc);
 
  bool parseOptionalAngleBracketOpen();
  bool parseAngleBracketClose(const Twine &Msg = "expected '>'");
 
  bool parseFieldInitializer(const FieldInfo &Field,
                             FieldInitializer &Initializer);
  bool parseFieldInitializer(const FieldInfo &Field,
                             const IntFieldInfo &Contents,
                             FieldInitializer &Initializer);
  bool parseFieldInitializer(const FieldInfo &Field,
                             const RealFieldInfo &Contents,
                             FieldInitializer &Initializer);
  bool parseFieldInitializer(const FieldInfo &Field,
                             const StructFieldInfo &Contents,
                             FieldInitializer &Initializer);
 
  bool parseStructInitializer(const StructInfo &Structure,
                              StructInitializer &Initializer);
  bool parseStructInstList(
      const StructInfo &Structure, std::vector<StructInitializer> &Initializers,
      const AsmToken::TokenKind EndToken = AsmToken::EndOfStatement);
 
  bool emitFieldValue(const FieldInfo &Field);
  bool emitFieldValue(const FieldInfo &Field, const IntFieldInfo &Contents);
  bool emitFieldValue(const FieldInfo &Field, const RealFieldInfo &Contents);
  bool emitFieldValue(const FieldInfo &Field, const StructFieldInfo &Contents);
 
  bool emitFieldInitializer(const FieldInfo &Field,
                            const FieldInitializer &Initializer);
  bool emitFieldInitializer(const FieldInfo &Field,
                            const IntFieldInfo &Contents,
                            const IntFieldInfo &Initializer);
  bool emitFieldInitializer(const FieldInfo &Field,
                            const RealFieldInfo &Contents,
                            const RealFieldInfo &Initializer);
  bool emitFieldInitializer(const FieldInfo &Field,
                            const StructFieldInfo &Contents,
                            const StructFieldInfo &Initializer);
 
  bool emitStructInitializer(const StructInfo &Structure,
                             const StructInitializer &Initializer);
 
  // User-defined types (structs, unions):
  bool emitStructValues(const StructInfo &Structure, unsigned *Count = nullptr);
  bool addStructField(StringRef Name, const StructInfo &Structure);
  bool parseDirectiveStructValue(const StructInfo &Structure,
                                 StringRef Directive, SMLoc DirLoc);
  bool parseDirectiveNamedStructValue(const StructInfo &Structure,
                                      StringRef Directive, SMLoc DirLoc,
                                      StringRef Name);
 
  // "=", "equ", "textequ"
  bool parseDirectiveEquate(StringRef IDVal, StringRef Name,
                            DirectiveKind DirKind, SMLoc NameLoc);
 
  bool parseDirectiveOrg(); // "org"
 
  bool emitAlignTo(int64_t Alignment);
  bool parseDirectiveAlign();  // "align"
  bool parseDirectiveEven();   // "even"
 
  // ".file", ".line", ".loc", ".stabs"
  bool parseDirectiveFile(SMLoc DirectiveLoc);
  bool parseDirectiveLine();
  bool parseDirectiveLoc();
  bool parseDirectiveStabs();
 
  // ".cv_file", ".cv_func_id", ".cv_inline_site_id", ".cv_loc", ".cv_linetable",
  // ".cv_inline_linetable", ".cv_def_range", ".cv_string"
  bool parseDirectiveCVFile();
  bool parseDirectiveCVFuncId();
  bool parseDirectiveCVInlineSiteId();
  bool parseDirectiveCVLoc();
  bool parseDirectiveCVLinetable();
  bool parseDirectiveCVInlineLinetable();
  bool parseDirectiveCVDefRange();
  bool parseDirectiveCVString();
  bool parseDirectiveCVStringTable();
  bool parseDirectiveCVFileChecksums();
  bool parseDirectiveCVFileChecksumOffset();
  bool parseDirectiveCVFPOData();
 
  // .cfi directives
  bool parseDirectiveCFIRegister(SMLoc DirectiveLoc);
  bool parseDirectiveCFIWindowSave(SMLoc DirectiveLoc);
  bool parseDirectiveCFISections();
  bool parseDirectiveCFIStartProc();
  bool parseDirectiveCFIEndProc();
  bool parseDirectiveCFIDefCfaOffset(SMLoc DirectiveLoc);
  bool parseDirectiveCFIDefCfa(SMLoc DirectiveLoc);
  bool parseDirectiveCFIAdjustCfaOffset(SMLoc DirectiveLoc);
  bool parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc);
  bool parseDirectiveCFIOffset(SMLoc DirectiveLoc);
  bool parseDirectiveCFIRelOffset(SMLoc DirectiveLoc);
  bool parseDirectiveCFIPersonalityOrLsda(bool IsPersonality);
  bool parseDirectiveCFIRememberState(SMLoc DirectiveLoc);
  bool parseDirectiveCFIRestoreState(SMLoc DirectiveLoc);
  bool parseDirectiveCFISameValue(SMLoc DirectiveLoc);
  bool parseDirectiveCFIRestore(SMLoc DirectiveLoc);
  bool parseDirectiveCFIEscape(SMLoc DirectiveLoc);
  bool parseDirectiveCFIReturnColumn(SMLoc DirectiveLoc);
  bool parseDirectiveCFISignalFrame();
  bool parseDirectiveCFIUndefined(SMLoc DirectiveLoc);
 
  // macro directives
  bool parseDirectivePurgeMacro(SMLoc DirectiveLoc);
  bool parseDirectiveExitMacro(SMLoc DirectiveLoc, StringRef Directive,
                               std::string &Value);
  bool parseDirectiveEndMacro(StringRef Directive);
  bool parseDirectiveMacro(StringRef Name, SMLoc NameLoc);
 
  bool parseDirectiveStruct(StringRef Directive, DirectiveKind DirKind,
                            StringRef Name, SMLoc NameLoc);
  bool parseDirectiveNestedStruct(StringRef Directive, DirectiveKind DirKind);
  bool parseDirectiveEnds(StringRef Name, SMLoc NameLoc);
  bool parseDirectiveNestedEnds();
 
  bool parseDirectiveExtern();
 
  /// 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 parseDirectiveComment(SMLoc DirectiveLoc); // "comment"
 
  bool parseDirectiveInclude(); // "include"
 
  // "if" or "ife"
  bool parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind);
  // "ifb" or "ifnb", depending on ExpectBlank.
  bool parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank);
  // "ifidn", "ifdif", "ifidni", or "ifdifi", depending on ExpectEqual and
  // CaseInsensitive.
  bool parseDirectiveIfidn(SMLoc DirectiveLoc, bool ExpectEqual,
                           bool CaseInsensitive);
  // "ifdef" or "ifndef", depending on expect_defined
  bool parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined);
  // "elseif" or "elseife"
  bool parseDirectiveElseIf(SMLoc DirectiveLoc, DirectiveKind DirKind);
  // "elseifb" or "elseifnb", depending on ExpectBlank.
  bool parseDirectiveElseIfb(SMLoc DirectiveLoc, bool ExpectBlank);
  // ".elseifdef" or ".elseifndef", depending on expect_defined
  bool parseDirectiveElseIfdef(SMLoc DirectiveLoc, bool expect_defined);
  // "elseifidn", "elseifdif", "elseifidni", or "elseifdifi", depending on
  // ExpectEqual and CaseInsensitive.
  bool parseDirectiveElseIfidn(SMLoc DirectiveLoc, bool ExpectEqual,
                               bool CaseInsensitive);
  bool parseDirectiveElse(SMLoc DirectiveLoc);   // "else"
  bool parseDirectiveEndIf(SMLoc DirectiveLoc);  // "endif"
  bool parseEscapedString(std::string &Data) override;
  bool parseAngleBracketString(std::string &Data) override;
 
  // Macro-like directives
  MCAsmMacro *parseMacroLikeBody(SMLoc DirectiveLoc);
  void instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
                                raw_svector_ostream &OS);
  void instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
                                SMLoc ExitLoc, raw_svector_ostream &OS);
  bool parseDirectiveRepeat(SMLoc DirectiveLoc, StringRef Directive);
  bool parseDirectiveFor(SMLoc DirectiveLoc, StringRef Directive);
  bool parseDirectiveForc(SMLoc DirectiveLoc, StringRef Directive);
  bool parseDirectiveWhile(SMLoc DirectiveLoc);
 
  // "_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"
  bool parseDirectiveError(SMLoc DirectiveLoc);
  // ".errb" or ".errnb", depending on ExpectBlank.
  bool parseDirectiveErrorIfb(SMLoc DirectiveLoc, bool ExpectBlank);
  // ".errdef" or ".errndef", depending on ExpectBlank.
  bool parseDirectiveErrorIfdef(SMLoc DirectiveLoc, bool ExpectDefined);
  // ".erridn", ".errdif", ".erridni", or ".errdifi", depending on ExpectEqual
  // and CaseInsensitive.
  bool parseDirectiveErrorIfidn(SMLoc DirectiveLoc, bool ExpectEqual,
                                bool CaseInsensitive);
  // ".erre" or ".errnz", depending on ExpectZero.
  bool parseDirectiveErrorIfe(SMLoc DirectiveLoc, bool ExpectZero);
 
  // ".radix"
  bool parseDirectiveRadix(SMLoc DirectiveLoc);
 
  // "echo"
  bool parseDirectiveEcho(SMLoc DirectiveLoc);
 
  void initializeDirectiveKindMap();
  void initializeCVDefRangeTypeMap();
  void initializeBuiltinSymbolMap();
};
 
} // end anonymous namespace
 
namespace llvm {
 
extern cl::opt<unsigned> AsmMacroMaxNestingDepth;
 
extern MCAsmParserExtension *createCOFFMasmParser();
 
} // end namespace llvm
 
enum { DEFAULT_ADDRSPACE = 0 };
 
MasmParser::MasmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
                       const MCAsmInfo &MAI, struct tm TM, unsigned CB)
    : Lexer(MAI), Ctx(Ctx), Out(Out), MAI(MAI), SrcMgr(SM),
      CurBuffer(CB ? CB : SM.getMainFileID()), TM(TM) {
  HadError = 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());
  EndStatementAtEOFStack.push_back(true);
 
  // Initialize the platform / file format parser.
  switch (Ctx.getObjectFileType()) {
  case MCContext::IsCOFF:
    PlatformParser.reset(createCOFFMasmParser());
    break;
  default:
    report_fatal_error("llvm-ml currently supports only COFF output.");
    break;
  }
 
  initializeDirectiveKindMap();
  PlatformParser->Initialize(*this);
  initializeCVDefRangeTypeMap();
  initializeBuiltinSymbolMap();
 
  NumOfMacroInstantiations = 0;
}
 
MasmParser::~MasmParser() {
  assert((HadError || ActiveMacros.empty()) &&
         "Unexpected active macro instantiation!");
 
  // Restore the saved diagnostics handler and context for use during
  // finalization.
  SrcMgr.setDiagHandler(SavedDiagHandler, SavedDiagContext);
}
 
void MasmParser::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 MasmParser::Note(SMLoc L, const Twine &Msg, SMRange Range) {
  printPendingErrors();
  printMessage(L, SourceMgr::DK_Note, Msg, Range);
  printMacroInstantiations();
}
 
bool MasmParser::Warning(SMLoc L, const Twine &Msg, SMRange Range) {
  if (getTargetParser().getTargetOptions().MCNoWarn)
    return false;
  if (getTargetParser().getTargetOptions().MCFatalWarnings)
    return Error(L, Msg, Range);
  printMessage(L, SourceMgr::DK_Warning, Msg, Range);
  printMacroInstantiations();
  return false;
}
 
bool MasmParser::printError(SMLoc L, const Twine &Msg, SMRange Range) {
  HadError = true;
  printMessage(L, SourceMgr::DK_Error, Msg, Range);
  printMacroInstantiations();
  return true;
}
 
bool MasmParser::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());
  EndStatementAtEOFStack.push_back(true);
  return false;
}
 
void MasmParser::jumpToLoc(SMLoc Loc, unsigned InBuffer,
                           bool EndStatementAtEOF) {
  CurBuffer = InBuffer ? InBuffer : SrcMgr.FindBufferContainingLoc(Loc);
  Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer(),
                  Loc.getPointer(), EndStatementAtEOF);
}
 
bool MasmParser::expandMacros() {
  const AsmToken &Tok = getTok();
  const std::string IDLower = Tok.getIdentifier().lower();
 
  const llvm::MCAsmMacro *M = getContext().lookupMacro(IDLower);
  if (M && M->IsFunction && peekTok().is(AsmToken::LParen)) {
    // This is a macro function invocation; expand it in place.
    const SMLoc MacroLoc = Tok.getLoc();
    const StringRef MacroId = Tok.getIdentifier();
    Lexer.Lex();
    if (handleMacroInvocation(M, MacroLoc)) {
      Lexer.UnLex(AsmToken(AsmToken::Error, MacroId));
      Lexer.Lex();
    }
    return false;
  }
 
  std::optional<std::string> ExpandedValue;
  auto BuiltinIt = BuiltinSymbolMap.find(IDLower);
  if (BuiltinIt != BuiltinSymbolMap.end()) {
    ExpandedValue =
        evaluateBuiltinTextMacro(BuiltinIt->getValue(), Tok.getLoc());
  } else {
    auto VarIt = Variables.find(IDLower);
    if (VarIt != Variables.end() && VarIt->getValue().IsText) {
      ExpandedValue = VarIt->getValue().TextValue;
    }
  }
 
  if (!ExpandedValue)
    return true;
  std::unique_ptr<MemoryBuffer> Instantiation =
      MemoryBuffer::getMemBufferCopy(*ExpandedValue, "<instantiation>");
 
  // Jump to the macro instantiation and prime the lexer.
  CurBuffer =
      SrcMgr.AddNewSourceBuffer(std::move(Instantiation), Tok.getEndLoc());
  Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer(), nullptr,
                  /*EndStatementAtEOF=*/false);
  EndStatementAtEOFStack.push_back(false);
  Lexer.Lex();
  return false;
}
 
const AsmToken &MasmParser::Lex(ExpandKind ExpandNextToken) {
  if (Lexer.getTok().is(AsmToken::Error))
    Error(Lexer.getErrLoc(), Lexer.getErr());
 
  // if it's a end of statement with a comment in it
  if (getTok().is(AsmToken::EndOfStatement)) {
    // if this is a line comment output it.
    if (!getTok().getString().empty() && getTok().getString().front() != '\n' &&
        getTok().getString().front() != '\r' && MAI.preserveAsmComments())
      Out.addExplicitComment(Twine(getTok().getString()));
  }
 
  const AsmToken *tok = &Lexer.Lex();
  bool StartOfStatement = Lexer.isAtStartOfStatement();
 
  while (ExpandNextToken == ExpandMacros && tok->is(AsmToken::Identifier)) {
    if (StartOfStatement) {
      AsmToken NextTok;
      MutableArrayRef<AsmToken> Buf(NextTok);
      size_t ReadCount = Lexer.peekTokens(Buf);
      if (ReadCount && NextTok.is(AsmToken::Identifier) &&
          (NextTok.getString().equals_insensitive("equ") ||
           NextTok.getString().equals_insensitive("textequ"))) {
        // This looks like an EQU or TEXTEQU directive; don't expand the
        // identifier, allowing for redefinitions.
        break;
      }
    }
    if (expandMacros())
      break;
  }
 
  // Parse comments here to be deferred until end of next statement.
  while (tok->is(AsmToken::Comment)) {
    if (MAI.preserveAsmComments())
      Out.addExplicitComment(Twine(tok->getString()));
    tok = &Lexer.Lex();
  }
 
  // Recognize and bypass line continuations.
  while (tok->is(AsmToken::BackSlash) &&
         peekTok().is(AsmToken::EndOfStatement)) {
    // Eat both the backslash and the end of statement.
    Lexer.Lex();
    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()) {
      EndStatementAtEOFStack.pop_back();
      jumpToLoc(ParentIncludeLoc, 0, EndStatementAtEOFStack.back());
      return Lex();
    }
    EndStatementAtEOFStack.pop_back();
    assert(EndStatementAtEOFStack.empty());
  }
 
  return *tok;
}
 
const AsmToken MasmParser::peekTok(bool ShouldSkipSpace) {
  AsmToken Tok;
 
  MutableArrayRef<AsmToken> Buf(Tok);
  size_t ReadCount = Lexer.peekTokens(Buf, ShouldSkipSpace);
 
  if (ReadCount == 0) {
    // 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()) {
      EndStatementAtEOFStack.pop_back();
      jumpToLoc(ParentIncludeLoc, 0, EndStatementAtEOFStack.back());
      return peekTok(ShouldSkipSpace);
    }
    EndStatementAtEOFStack.pop_back();
    assert(EndStatementAtEOFStack.empty());
  }
 
  assert(ReadCount == 1);
  return Tok;
}
 
bool MasmParser::enabledGenDwarfForAssembly() {
  // Check whether the user specified -g.
  if (!getContext().getGenDwarfForAssembly())
    return false;
  // If we haven't encountered any .file directives (which would imply that
  // the assembler source was produced with debug info already) then emit one
  // describing the assembler source file itself.
  if (getContext().getGenDwarfFileNumber() == 0) {
    // Use the first #line directive for this, if any. It's preprocessed, so
    // there is no checksum, and of course no source directive.
    if (!FirstCppHashFilename.empty())
      getContext().setMCLineTableRootFile(
          /*CUID=*/0, getContext().getCompilationDir(), FirstCppHashFilename,
          /*Cksum=*/std::nullopt, /*Source=*/std::nullopt);
    const MCDwarfFile &RootFile =
        getContext().getMCDwarfLineTable(/*CUID=*/0).getRootFile();
    getContext().setGenDwarfFileNumber(getStreamer().emitDwarfFileDirective(
        /*CUID=*/0, getContext().getCompilationDir(), RootFile.Name,
        RootFile.Checksum, RootFile.Source));
  }
  return true;
}
 
bool MasmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
  // Create the initial section, if requested.
  if (!NoInitialTextSection)
    Out.initSections(false, getTargetParser().getSTI());
 
  // Prime the lexer.
  Lex();
 
  HadError = false;
  AsmCond StartingCondState = TheCondState;
  SmallVector<AsmRewrite, 4> AsmStrRewrites;
 
  // If we are generating dwarf for assembly source files save the initial text
  // section.  (Don't use enabledGenDwarfForAssembly() here, as we aren't
  // emitting any actual debug info yet and haven't had a chance to parse any
  // embedded .file directives.)
  if (getContext().getGenDwarfForAssembly()) {
    MCSection *Sec = getStreamer().getCurrentSectionOnly();
    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;
  }
 
  getTargetParser().onBeginOfFile();
 
  // While we have input, parse each statement.
  while (Lexer.isNot(AsmToken::Eof) ||
         SrcMgr.getParentIncludeLoc(CurBuffer) != SMLoc()) {
    // Skip through the EOF at the end of an inclusion.
    if (Lexer.is(AsmToken::Eof))
      Lex();
 
    ParseStatementInfo Info(&AsmStrRewrites);
    bool Parsed = parseStatement(Info, nullptr);
 
    // If we have a Lexer Error we are on an Error Token. Load in Lexer Error
    // for printing ErrMsg via Lex() only if no (presumably better) parser error
    // exists.
    if (Parsed && !hasPendingError() && Lexer.getTok().is(AsmToken::Error)) {
      Lex();
    }
 
    // parseStatement returned true so may need to emit an error.
    printPendingErrors();
 
    // Skipping to the next line if needed.
    if (Parsed && !getLexer().isAtStartOfStatement())
      eatToEndOfStatement();
  }
 
  getTargetParser().onEndOfFile();
  printPendingErrors();
 
  // All errors should have been emitted.
  assert(!hasPendingError() && "unexpected error from parseStatement");
 
  getTargetParser().flushPendingInstructions(getStreamer());
 
  if (TheCondState.TheCond != StartingCondState.TheCond ||
      TheCondState.Ignore != StartingCondState.Ignore)
    printError(getTok().getLoc(), "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)
        printError(getTok().getLoc(), "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 necessarily have seen everything yet.
  if (!NoFinalize) {
    if (MAI.hasSubsectionsViaSymbols()) {
      for (const auto &TableEntry : getContext().getSymbols()) {
        MCSymbol *Sym = TableEntry.getValue().Symbol;
        // 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 && 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.
          printError(getTok().getLoc(), "assembler local symbol '" +
                                            Sym->getName() + "' not defined");
      }
    }
 
    // Temporary symbols like the ones for directional jumps don't go in the
    // symbol table. They also need to be diagnosed in all (final) cases.
    for (std::tuple<SMLoc, CppHashInfoTy, MCSymbol *> &LocSym : DirLabels) {
      if (std::get<2>(LocSym)->isUndefined()) {
        // Reset the state of any "# line file" directives we've seen to the
        // context as it was at the diagnostic site.
        CppHashInfo = std::get<1>(LocSym);
        printError(std::get<0>(LocSym), "directional label undefined");
      }
    }
  }
 
  // Finalize the output stream if there are no errors and if the client wants
  // us to.
  if (!HadError && !NoFinalize)
    Out.finish(Lexer.getLoc());
 
  return HadError || getContext().hadError();
}
 
bool MasmParser::checkForValidSection() {
  if (!ParsingMSInlineAsm && !getStreamer().getCurrentSectionOnly()) {
    Out.initSections(false, getTargetParser().getSTI());
    return Error(getTok().getLoc(),
                 "expected section directive before assembly directive");
  }
  return false;
}
 
/// Throw away the rest of the line for testing purposes.
void MasmParser::eatToEndOfStatement() {
  while (Lexer.isNot(AsmToken::EndOfStatement)) {
    if (Lexer.is(AsmToken::Eof)) {
      SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
      if (ParentIncludeLoc == SMLoc()) {
        break;
      }
 
      EndStatementAtEOFStack.pop_back();
      jumpToLoc(ParentIncludeLoc, 0, EndStatementAtEOFStack.back());
    }
 
    Lexer.Lex();
  }
 
  // Eat EOL.
  if (Lexer.is(AsmToken::EndOfStatement))
    Lexer.Lex();
}
 
SmallVector<StringRef, 1>
MasmParser::parseStringRefsTo(AsmToken::TokenKind EndTok) {
  SmallVector<StringRef, 1> Refs;
  const char *Start = getTok().getLoc().getPointer();
  while (Lexer.isNot(EndTok)) {
    if (Lexer.is(AsmToken::Eof)) {
      SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
      if (ParentIncludeLoc == SMLoc()) {
        break;
      }
      Refs.emplace_back(Start, getTok().getLoc().getPointer() - Start);
 
      EndStatementAtEOFStack.pop_back();
      jumpToLoc(ParentIncludeLoc, 0, EndStatementAtEOFStack.back());
      Lexer.Lex();
      Start = getTok().getLoc().getPointer();
    } else {
      Lexer.Lex();
    }
  }
  Refs.emplace_back(Start, getTok().getLoc().getPointer() - Start);
  return Refs;
}
 
std::string MasmParser::parseStringTo(AsmToken::TokenKind EndTok) {
  SmallVector<StringRef, 1> Refs = parseStringRefsTo(EndTok);
  std::string Str;
  for (StringRef S : Refs) {
    Str.append(S.str());
  }
  return Str;
}
 
StringRef MasmParser::parseStringToEndOfStatement() {
  const char *Start = getTok().getLoc().getPointer();
 
  while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof))
    Lexer.Lex();
 
  const char *End = getTok().getLoc().getPointer();
  return StringRef(Start, End - Start);
}
 
/// Parse a paren expression and return it.
/// NOTE: This assumes the leading '(' has already been consumed.
///
/// parenexpr ::= expr)
///
bool MasmParser::parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) {
  if (parseExpression(Res))
    return true;
  EndLoc = Lexer.getTok().getEndLoc();
  return parseRParen();
}
 
/// Parse a bracket expression and return it.
/// NOTE: This assumes the leading '[' has already been consumed.
///
/// bracketexpr ::= expr]
///
bool MasmParser::parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc) {
  if (parseExpression(Res))
    return true;
  EndLoc = getTok().getEndLoc();
  if (parseToken(AsmToken::RBrac, "expected ']' in brackets expression"))
    return true;
  return false;
}
 
/// Parse a primary expression and return it.
///  primaryexpr ::= (parenexpr
///  primaryexpr ::= symbol
///  primaryexpr ::= number
///  primaryexpr ::= '.'
///  primaryexpr ::= ~,+,-,'not' primaryexpr
///  primaryexpr ::= string
///          (a string is interpreted as a 64-bit number in big-endian base-256)
bool MasmParser::parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc,
                                  AsmTypeInfo *TypeInfo) {
  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, nullptr))
      return true;
    Res = MCUnaryExpr::createLNot(Res, getContext(), FirstTokenLoc);
    return false;
  case AsmToken::Dollar:
  case AsmToken::At:
  case AsmToken::Identifier: {
    StringRef Identifier;
    if (parseIdentifier(Identifier)) {
      // We may have failed but $ may be a valid token.
      if (getTok().is(AsmToken::Dollar)) {
        if (Lexer.getMAI().getDollarIsPC()) {
          Lex();
          // 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 named bitwise negation.
    if (Identifier.equals_insensitive("not")) {
      if (parsePrimaryExpr(Res, EndLoc, nullptr))
        return true;
      Res = MCUnaryExpr::createNot(Res, getContext(), FirstTokenLoc);
      return false;
    }
    // Parse directional local label references.
    if (Identifier.equals_insensitive("@b") ||
        Identifier.equals_insensitive("@f")) {
      bool Before = Identifier.equals_insensitive("@b");
      MCSymbol *Sym = getContext().getDirectionalLocalSymbol(0, Before);
      if (Before && Sym->isUndefined())
        return Error(FirstTokenLoc, "Expected @@ label before @B reference");
      Res = MCSymbolRefExpr::create(Sym, getContext());
      return false;
    }
    // Parse symbol variant.
    std::pair<StringRef, StringRef> Split;
    if (!MAI.useParensForSymbolVariant()) {
      Split = Identifier.split('@');
    } else if (Lexer.is(AsmToken::LParen)) {
      Lex(); // eat '('.
      StringRef VName;
      parseIdentifier(VName);
      // eat ')'.
      if (parseToken(AsmToken::RParen,
                     "unexpected token in variant, expected ')'"))
        return true;
      Split = std::make_pair(Identifier, VName);
    }
 
    EndLoc = SMLoc::getFromPointer(Identifier.end());
 
    // This is a symbol reference.
    StringRef SymbolName = Identifier;
    if (SymbolName.empty())
      return Error(getLexer().getLoc(), "expected a symbol reference");
 
    MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
 
    // Look up the symbol variant if used.
    if (!Split.second.empty()) {
      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 + "'");
      }
    }
 
    // Find the field offset if used.
    AsmFieldInfo Info;
    Split = SymbolName.split('.');
    if (Split.second.empty()) {
    } else {
      SymbolName = Split.first;
      if (lookUpField(SymbolName, Split.second, Info)) {
        std::pair<StringRef, StringRef> BaseMember = Split.second.split('.');
        StringRef Base = BaseMember.first, Member = BaseMember.second;
        lookUpField(Base, Member, Info);
      } else if (Structs.count(SymbolName.lower())) {
        // This is actually a reference to a field offset.
        Res = MCConstantExpr::create(Info.Offset, getContext());
        return false;
      }
    }
 
    MCSymbol *Sym = getContext().getInlineAsmLabel(SymbolName);
    if (!Sym) {
      // If this is a built-in numeric value, treat it as a constant.
      auto BuiltinIt = BuiltinSymbolMap.find(SymbolName.lower());
      const BuiltinSymbol Symbol = (BuiltinIt == BuiltinSymbolMap.end())
                                       ? BI_NO_SYMBOL
                                       : BuiltinIt->getValue();
      if (Symbol != BI_NO_SYMBOL) {
        const MCExpr *Value = evaluateBuiltinValue(Symbol, FirstTokenLoc);
        if (Value) {
          Res = Value;
          return false;
        }
      }
 
      // Variables use case-insensitive symbol names; if this is a variable, we
      // find the symbol using its canonical name.
      auto VarIt = Variables.find(SymbolName.lower());
      if (VarIt != Variables.end())
        SymbolName = VarIt->second.Name;
      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()) {
      auto V = Sym->getVariableValue(/*SetUsed=*/false);
      bool DoInline = isa<MCConstantExpr>(V) && !Variant;
      if (auto TV = dyn_cast<MCTargetExpr>(V))
        DoInline = TV->inlineAssignedExpr();
      if (DoInline) {
        if (Variant)
          return Error(EndLoc, "unexpected modifier on variable reference");
        Res = Sym->getVariableValue(/*SetUsed=*/false);
        return false;
      }
    }
 
    // Otherwise create a symbol ref.
    const MCExpr *SymRef =
        MCSymbolRefExpr::create(Sym, Variant, getContext(), FirstTokenLoc);
    if (Info.Offset) {
      Res = MCBinaryExpr::create(
          MCBinaryExpr::Add, SymRef,
          MCConstantExpr::create(Info.Offset, getContext()), getContext());
    } else {
      Res = SymRef;
    }
    if (TypeInfo) {
      if (Info.Type.Name.empty()) {
        auto TypeIt = KnownType.find(Identifier.lower());
        if (TypeIt != KnownType.end()) {
          Info.Type = TypeIt->second;
        }
      }
 
      *TypeInfo = Info.Type;
    }
    return false;
  }
  case AsmToken::BigNum:
    return TokError("literal value out of range for directive");
  case AsmToken::Integer: {
    int64_t IntVal = getTok().getIntVal();
    Res = MCConstantExpr::create(IntVal, getContext());
    EndLoc = Lexer.getTok().getEndLoc();
    Lex(); // Eat token.
    return false;
  }
  case AsmToken::String: {
    // MASM strings (used as constants) are interpreted as big-endian base-256.
    SMLoc ValueLoc = getTok().getLoc();
    std::string Value;
    if (parseEscapedString(Value))
      return true;
    if (Value.size() > 8)
      return Error(ValueLoc, "literal value out of range");
    uint64_t IntValue = 0;
    for (const unsigned char CharVal : Value)
      IntValue = (IntValue << 8) | CharVal;
    Res = MCConstantExpr::create(IntValue, getContext());
    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, nullptr))
      return true;
    Res = MCUnaryExpr::createMinus(Res, getContext(), FirstTokenLoc);
    return false;
  case AsmToken::Plus:
    Lex(); // Eat the operator.
    if (parsePrimaryExpr(Res, EndLoc, nullptr))
      return true;
    Res = MCUnaryExpr::createPlus(Res, getContext(), FirstTokenLoc);
    return false;
  case AsmToken::Tilde:
    Lex(); // Eat the operator.
    if (parsePrimaryExpr(Res, EndLoc, nullptr))
      return true;
    Res = MCUnaryExpr::createNot(Res, getContext(), FirstTokenLoc);
    return false;
  // MIPS unary expression operators. The lexer won't generate these tokens if
  // MCAsmInfo::HasMipsExpressions is false for the target.
  case AsmToken::PercentCall16:
  case AsmToken::PercentCall_Hi:
  case AsmToken::PercentCall_Lo:
  case AsmToken::PercentDtprel_Hi:
  case AsmToken::PercentDtprel_Lo:
  case AsmToken::PercentGot:
  case AsmToken::PercentGot_Disp:
  case AsmToken::PercentGot_Hi:
  case AsmToken::PercentGot_Lo:
  case AsmToken::PercentGot_Ofst:
  case AsmToken::PercentGot_Page:
  case AsmToken::PercentGottprel:
  case AsmToken::PercentGp_Rel:
  case AsmToken::PercentHi:
  case AsmToken::PercentHigher:
  case AsmToken::PercentHighest:
  case AsmToken::PercentLo:
  case AsmToken::PercentNeg:
  case AsmToken::PercentPcrel_Hi:
  case AsmToken::PercentPcrel_Lo:
  case AsmToken::PercentTlsgd:
  case AsmToken::PercentTlsldm:
  case AsmToken::PercentTprel_Hi:
  case AsmToken::PercentTprel_Lo:
    Lex(); // Eat the operator.
    if (Lexer.isNot(AsmToken::LParen))
      return TokError("expected '(' after operator");
    Lex(); // Eat the operator.
    if (parseExpression(Res, EndLoc))
      return true;
    if (parseRParen())
      return true;
    Res = getTargetParser().createTargetUnaryExpr(Res, FirstTokenKind, Ctx);
    return !Res;
  }
}
 
bool MasmParser::parseExpression(const MCExpr *&Res) {
  SMLoc EndLoc;
  return parseExpression(Res, EndLoc);
}
 
/// This function checks if the next token is <string> type or arithmetic.
/// string that begin with character '<' must end with character '>'.
/// otherwise it is arithmetics.
/// If the function returns a 'true' value,
/// the End argument will be filled with the last location pointed to the '>'
/// character.
static bool isAngleBracketString(SMLoc &StrLoc, SMLoc &EndLoc) {
  assert((StrLoc.getPointer() != nullptr) &&
         "Argument to the function cannot be a NULL value");
  const char *CharPtr = StrLoc.getPointer();
  while ((*CharPtr != '>') && (*CharPtr != '\n') && (*CharPtr != '\r') &&
         (*CharPtr != '\0')) {
    if (*CharPtr == '!')
      CharPtr++;
    CharPtr++;
  }
  if (*CharPtr == '>') {
    EndLoc = StrLoc.getFromPointer(CharPtr + 1);
    return true;
  }
  return false;
}
 
/// creating a string without the escape characters '!'.
static std::string angleBracketString(StringRef BracketContents) {
  std::string Res;
  for (size_t Pos = 0; Pos < BracketContents.size(); Pos++) {
    if (BracketContents[Pos] == '!')
      Pos++;
    Res += BracketContents[Pos];
  }
  return Res;
}
 
/// 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 MasmParser::parseExpression(const MCExpr *&Res, SMLoc &EndLoc) {
  // Parse the expression.
  Res = nullptr;
  if (getTargetParser().parsePrimaryExpr(Res, EndLoc) ||
      parseBinOpRHS(1, Res, EndLoc))
    return true;
 
  // Try to constant fold it up front, if possible. Do not exploit
  // assembler here.
  int64_t Value;
  if (Res->evaluateAsAbsolute(Value))
    Res = MCConstantExpr::create(Value, getContext());
 
  return false;
}
 
bool MasmParser::parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) {
  Res = nullptr;
  return parseParenExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc);
}
 
bool MasmParser::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) {
      EndLoc = getTok().getEndLoc();
      if (parseRParen())
        return true;
    }
  }
  return false;
}
 
bool MasmParser::parseAbsoluteExpression(int64_t &Res) {
  const MCExpr *Expr;
 
  SMLoc StartLoc = Lexer.getLoc();
  if (parseExpression(Expr))
    return true;
 
  if (!Expr->evaluateAsAbsolute(Res, getStreamer().getAssemblerPtr()))
    return Error(StartLoc, "expected absolute expression");
 
  return false;
}
 
static unsigned getGNUBinOpPrecedence(AsmToken::TokenKind K,
                                      MCBinaryExpr::Opcode &Kind,
                                      bool ShouldUseLogicalShr,
                                      bool EndExpressionAtGreater) {
  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:
    if (EndExpressionAtGreater)
      return 0;
    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: |, &, ^
  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:
    if (EndExpressionAtGreater)
      return 0;
    Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr;
    return 6;
  }
}
 
unsigned MasmParser::getBinOpPrecedence(AsmToken::TokenKind K,
                                        MCBinaryExpr::Opcode &Kind) {
  bool ShouldUseLogicalShr = MAI.shouldUseLogicalShr();
  return getGNUBinOpPrecedence(K, Kind, ShouldUseLogicalShr,
                               AngleBracketDepth > 0);
}
 
/// Parse all binary operators with precedence >= 'Precedence'.
/// Res contains the LHS of the expression on input.
bool MasmParser::parseBinOpRHS(unsigned Precedence, const MCExpr *&Res,
                               SMLoc &EndLoc) {
  SMLoc StartLoc = Lexer.getLoc();
  while (true) {
    AsmToken::TokenKind TokKind = Lexer.getKind();
    if (Lexer.getKind() == AsmToken::Identifier) {
      TokKind = StringSwitch<AsmToken::TokenKind>(Lexer.getTok().getString())
                    .CaseLower("and", AsmToken::Amp)
                    .CaseLower("not", AsmToken::Exclaim)
                    .CaseLower("or", AsmToken::Pipe)
                    .CaseLower("xor", AsmToken::Caret)
                    .CaseLower("shl", AsmToken::LessLess)
                    .CaseLower("shr", AsmToken::GreaterGreater)
                    .CaseLower("eq", AsmToken::EqualEqual)
                    .CaseLower("ne", AsmToken::ExclaimEqual)
                    .CaseLower("lt", AsmToken::Less)
                    .CaseLower("le", AsmToken::LessEqual)
                    .CaseLower("gt", AsmToken::Greater)
                    .CaseLower("ge", AsmToken::GreaterEqual)
                    .Default(TokKind);
    }
    MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
    unsigned TokPrec = getBinOpPrecedence(TokKind, 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 (getTargetParser().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(), StartLoc);
  }
}
 
/// ParseStatement:
///   ::= % statement
///   ::= EndOfStatement
///   ::= Label* Directive ...Operands... EndOfStatement
///   ::= Label* Identifier OperandList* EndOfStatement
bool MasmParser::parseStatement(ParseStatementInfo &Info,
                                MCAsmParserSemaCallback *SI) {
  assert(!hasPendingError() && "parseStatement started with pending error");
  // Eat initial spaces and comments.
  while (Lexer.is(AsmToken::Space))
    Lex();
  if (Lexer.is(AsmToken::EndOfStatement)) {
    // If this is a line comment we can drop it safely.
    if (getTok().getString().empty() || getTok().getString().front() == '\r' ||
        getTok().getString().front() == '\n')
      Out.addBlankLine();
    Lex();
    return false;
  }
 
  // If preceded by an expansion operator, first expand all text macros and
  // macro functions.
  if (getTok().is(AsmToken::Percent)) {
    SMLoc ExpansionLoc = getTok().getLoc();
    if (parseToken(AsmToken::Percent) || expandStatement(ExpansionLoc))
      return true;
  }
 
  // Statements always start with an identifier, unless we're dealing with a
  // processor directive (.386, .686, etc.) that lexes as a real.
  AsmToken ID = getTok();
  SMLoc IDLoc = ID.getLoc();
  StringRef IDVal;
  if (Lexer.is(AsmToken::HashDirective))
    return parseCppHashLineFilenameComment(IDLoc);
  if (Lexer.is(AsmToken::Dot)) {
    // Treat '.' as a valid identifier in this context.
    Lex();
    IDVal = ".";
  } else if (Lexer.is(AsmToken::Real)) {
    // Treat ".<number>" as a valid identifier in this context.
    IDVal = getTok().getString();
    Lex(); // always eat a token
    if (!IDVal.starts_with("."))
      return Error(IDLoc, "unexpected token at start of statement");
  } else if (parseIdentifier(IDVal, StartOfStatement)) {
    if (!TheCondState.Ignore) {
      Lex(); // always eat a token
      return Error(IDLoc, "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.lower());
  DirectiveKind DirKind = (DirKindIt == DirectiveKindMap.end())
                              ? DK_NO_DIRECTIVE
                              : DirKindIt->getValue();
  switch (DirKind) {
  default:
    break;
  case DK_IF:
  case DK_IFE:
    return parseDirectiveIf(IDLoc, DirKind);
  case DK_IFB:
    return parseDirectiveIfb(IDLoc, true);
  case DK_IFNB:
    return parseDirectiveIfb(IDLoc, false);
  case DK_IFDEF:
    return parseDirectiveIfdef(IDLoc, true);
  case DK_IFNDEF:
    return parseDirectiveIfdef(IDLoc, false);
  case DK_IFDIF:
    return parseDirectiveIfidn(IDLoc, /*ExpectEqual=*/false,
                               /*CaseInsensitive=*/false);
  case DK_IFDIFI:
    return parseDirectiveIfidn(IDLoc, /*ExpectEqual=*/false,
                               /*CaseInsensitive=*/true);
  case DK_IFIDN:
    return parseDirectiveIfidn(IDLoc, /*ExpectEqual=*/true,
                               /*CaseInsensitive=*/false);
  case DK_IFIDNI:
    return parseDirectiveIfidn(IDLoc, /*ExpectEqual=*/true,
                               /*CaseInsensitive=*/true);
  case DK_ELSEIF:
  case DK_ELSEIFE:
    return parseDirectiveElseIf(IDLoc, DirKind);
  case DK_ELSEIFB:
    return parseDirectiveElseIfb(IDLoc, true);
  case DK_ELSEIFNB:
    return parseDirectiveElseIfb(IDLoc, false);
  case DK_ELSEIFDEF:
    return parseDirectiveElseIfdef(IDLoc, true);
  case DK_ELSEIFNDEF:
    return parseDirectiveElseIfdef(IDLoc, false);
  case DK_ELSEIFDIF:
    return parseDirectiveElseIfidn(IDLoc, /*ExpectEqual=*/false,
                                   /*CaseInsensitive=*/false);
  case DK_ELSEIFDIFI:
    return parseDirectiveElseIfidn(IDLoc, /*ExpectEqual=*/false,
                                   /*CaseInsensitive=*/true);
  case DK_ELSEIFIDN:
    return parseDirectiveElseIfidn(IDLoc, /*ExpectEqual=*/true,
                                   /*CaseInsensitive=*/false);
  case DK_ELSEIFIDNI:
    return parseDirectiveElseIfidn(IDLoc, /*ExpectEqual=*/true,
                                   /*CaseInsensitive=*/true);
  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?
 
  // Check for a label.
  //   ::= identifier ':'
  //   ::= number ':'
  if (Lexer.is(AsmToken::Colon) && getTargetParser().isLabel(ID)) {
    if (checkForValidSection())
      return true;
 
    // 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 (ParsingMSInlineAsm && SI) {
      StringRef RewrittenLabel =
          SI->LookupInlineAsmLabel(IDVal, getSourceManager(), IDLoc, true);
      assert(!RewrittenLabel.empty() &&
             "We should have an internal name here.");
      Info.AsmRewrites->emplace_back(AOK_Label, IDLoc, IDVal.size(),
                                     RewrittenLabel);
      IDVal = RewrittenLabel;
    }
    // Handle directional local labels
    if (IDVal == "@@") {
      Sym = Ctx.createDirectionalLocalSymbol(0);
    } else {
      Sym = getContext().getOrCreateSymbol(IDVal);
    }
 
    // End of Labels should be treated as end of line for lexing
    // purposes but that information is not available to the Lexer who
    // does not understand Labels. This may cause us to see a Hash
    // here instead of a preprocessor line comment.
    if (getTok().is(AsmToken::Hash)) {
      std::string CommentStr = parseStringTo(AsmToken::EndOfStatement);
      Lexer.Lex();
      Lexer.UnLex(AsmToken(AsmToken::EndOfStatement, CommentStr));
    }
 
    // Consume any end of statement token, if present, to avoid spurious
    // addBlankLine calls().
    if (getTok().is(AsmToken::EndOfStatement)) {
      Lex();
    }
 
    getTargetParser().doBeforeLabelEmit(Sym, IDLoc);
 
    // Emit the label.
    if (!getTargetParser().isParsingMSInlineAsm())
      Out.emitLabel(Sym, IDLoc);
 
    // 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 (enabledGenDwarfForAssembly())
      MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(),
                                 IDLoc);
 
    getTargetParser().onLabelParsed(Sym);
 
    return false;
  }
 
  // If macros are enabled, check to see if this is a macro instantiation.
  if (const MCAsmMacro *M = getContext().lookupMacro(IDVal.lower())) {
    return handleMacroEntry(M, IDLoc);
  }
 
  // Otherwise, we have a normal instruction or directive.
 
  if (DirKind != DK_NO_DIRECTIVE) {
    // There are several entities interested in parsing directives:
    //
    // 1. Asm parser extensions. For example, platform-specific parsers
    //    (like the ELF parser) register themselves as extensions.
    // 2. The target-specific assembly parser. Some directives are target
    //    specific or may potentially behave differently on certain targets.
    // 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.
 
    getTargetParser().flushPendingInstructions(getStreamer());
 
    // Special-case handling of structure-end directives at higher priority,
    // since ENDS is overloaded as a segment-end directive.
    if (IDVal.equals_insensitive("ends") && StructInProgress.size() > 1 &&
        getTok().is(AsmToken::EndOfStatement)) {
      return parseDirectiveNestedEnds();
    }
 
    // First, 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.lower());
    if (Handler.first)
      return (*Handler.second)(Handler.first, IDVal, IDLoc);
 
    // Next, let the target-specific assembly parser try.
    if (ID.isNot(AsmToken::Identifier))
      return false;
 
    ParseStatus TPDirectiveReturn = getTargetParser().parseDirective(ID);
    assert(TPDirectiveReturn.isFailure() == hasPendingError() &&
           "Should only return Failure iff there was an error");
    if (TPDirectiveReturn.isFailure())
      return true;
    if (TPDirectiveReturn.isSuccess())
      return false;
 
    // 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_ASCII:
      return parseDirectiveAscii(IDVal, false);
    case DK_ASCIZ:
    case DK_STRING:
      return parseDirectiveAscii(IDVal, true);
    case DK_BYTE:
    case DK_SBYTE:
    case DK_DB:
      return parseDirectiveValue(IDVal, 1);
    case DK_WORD:
    case DK_SWORD:
    case DK_DW:
      return parseDirectiveValue(IDVal, 2);
    case DK_DWORD:
    case DK_SDWORD:
    case DK_DD:
      return parseDirectiveValue(IDVal, 4);
    case DK_FWORD:
    case DK_DF:
      return parseDirectiveValue(IDVal, 6);
    case DK_QWORD:
    case DK_SQWORD:
    case DK_DQ:
      return parseDirectiveValue(IDVal, 8);
    case DK_REAL4:
      return parseDirectiveRealValue(IDVal, APFloat::IEEEsingle(), 4);
    case DK_REAL8:
      return parseDirectiveRealValue(IDVal, APFloat::IEEEdouble(), 8);
    case DK_REAL10:
      return parseDirectiveRealValue(IDVal, APFloat::x87DoubleExtended(), 10);
    case DK_STRUCT:
    case DK_UNION:
      return parseDirectiveNestedStruct(IDVal, DirKind);
    case DK_ENDS:
      return parseDirectiveNestedEnds();
    case DK_ALIGN:
      return parseDirectiveAlign();
    case DK_EVEN:
      return parseDirectiveEven();
    case DK_ORG:
      return parseDirectiveOrg();
    case DK_EXTERN:
      return parseDirectiveExtern();
    case DK_PUBLIC:
      return parseDirectiveSymbolAttribute(MCSA_Global);
    case DK_COMM:
      return parseDirectiveComm(/*IsLocal=*/false);
    case DK_COMMENT:
      return parseDirectiveComment(IDLoc);
    case DK_INCLUDE:
      return parseDirectiveInclude();
    case DK_REPEAT:
      return parseDirectiveRepeat(IDLoc, IDVal);
    case DK_WHILE:
      return parseDirectiveWhile(IDLoc);
    case DK_FOR:
      return parseDirectiveFor(IDLoc, IDVal);
    case DK_FORC:
      return parseDirectiveForc(IDLoc, IDVal);
    case DK_FILE:
      return parseDirectiveFile(IDLoc);
    case DK_LINE:
      return parseDirectiveLine();
    case DK_LOC:
      return parseDirectiveLoc();
    case DK_STABS:
      return parseDirectiveStabs();
    case DK_CV_FILE:
      return parseDirectiveCVFile();
    case DK_CV_FUNC_ID:
      return parseDirectiveCVFuncId();
    case DK_CV_INLINE_SITE_ID:
      return parseDirectiveCVInlineSiteId();
    case DK_CV_LOC:
      return parseDirectiveCVLoc();
    case DK_CV_LINETABLE:
      return parseDirectiveCVLinetable();
    case DK_CV_INLINE_LINETABLE:
      return parseDirectiveCVInlineLinetable();
    case DK_CV_DEF_RANGE:
      return parseDirectiveCVDefRange();
    case DK_CV_STRING:
      return parseDirectiveCVString();
    case DK_CV_STRINGTABLE:
      return parseDirectiveCVStringTable();
    case DK_CV_FILECHECKSUMS:
      return parseDirectiveCVFileChecksums();
    case DK_CV_FILECHECKSUM_OFFSET:
      return parseDirectiveCVFileChecksumOffset();
    case DK_CV_FPO_DATA:
      return parseDirectiveCVFPOData();
    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(IDLoc);
    case DK_CFI_ADJUST_CFA_OFFSET:
      return parseDirectiveCFIAdjustCfaOffset(IDLoc);
    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(IDLoc);
    case DK_CFI_RESTORE_STATE:
      return parseDirectiveCFIRestoreState(IDLoc);
    case DK_CFI_SAME_VALUE:
      return parseDirectiveCFISameValue(IDLoc);
    case DK_CFI_RESTORE:
      return parseDirectiveCFIRestore(IDLoc);
    case DK_CFI_ESCAPE:
      return parseDirectiveCFIEscape(IDLoc);
    case DK_CFI_RETURN_COLUMN:
      return parseDirectiveCFIReturnColumn(IDLoc);
    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(IDLoc);
    case DK_EXITM:
      Info.ExitValue = "";
      return parseDirectiveExitMacro(IDLoc, IDVal, *Info.ExitValue);
    case DK_ENDM:
      Info.ExitValue = "";
      return parseDirectiveEndMacro(IDVal);
    case DK_PURGE:
      return parseDirectivePurgeMacro(IDLoc);
    case DK_END:
      return parseDirectiveEnd(IDLoc);
    case DK_ERR:
      return parseDirectiveError(IDLoc);
    case DK_ERRB:
      return parseDirectiveErrorIfb(IDLoc, true);
    case DK_ERRNB:
      return parseDirectiveErrorIfb(IDLoc, false);
    case DK_ERRDEF:
      return parseDirectiveErrorIfdef(IDLoc, true);
    case DK_ERRNDEF:
      return parseDirectiveErrorIfdef(IDLoc, false);
    case DK_ERRDIF:
      return parseDirectiveErrorIfidn(IDLoc, /*ExpectEqual=*/false,
                                      /*CaseInsensitive=*/false);
    case DK_ERRDIFI:
      return parseDirectiveErrorIfidn(IDLoc, /*ExpectEqual=*/false,
                                      /*CaseInsensitive=*/true);
    case DK_ERRIDN:
      return parseDirectiveErrorIfidn(IDLoc, /*ExpectEqual=*/true,
                                      /*CaseInsensitive=*/false);
    case DK_ERRIDNI:
      return parseDirectiveErrorIfidn(IDLoc, /*ExpectEqual=*/true,
                                      /*CaseInsensitive=*/true);
    case DK_ERRE:
      return parseDirectiveErrorIfe(IDLoc, true);
    case DK_ERRNZ:
      return parseDirectiveErrorIfe(IDLoc, false);
    case DK_RADIX:
      return parseDirectiveRadix(IDLoc);
    case DK_ECHO:
      return parseDirectiveEcho(IDLoc);
    }
 
    return Error(IDLoc, "unknown directive");
  }
 
  // We also check if this is allocating memory with user-defined type.
  auto IDIt = Structs.find(IDVal.lower());
  if (IDIt != Structs.end())
    return parseDirectiveStructValue(/*Structure=*/IDIt->getValue(), IDVal,
                                     IDLoc);
 
  // Non-conditional Microsoft directives sometimes follow their first argument.
  const AsmToken nextTok = getTok();
  const StringRef nextVal = nextTok.getString();
  const SMLoc nextLoc = nextTok.getLoc();
 
  const AsmToken afterNextTok = peekTok();
 
  // There are several entities interested in parsing infix directives:
  //
  // 1. Asm parser extensions. For example, platform-specific parsers
  //    (like the ELF parser) register themselves as extensions.
  // 2. 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.
 
  getTargetParser().flushPendingInstructions(getStreamer());
 
  // Special-case handling of structure-end directives at higher priority, since
  // ENDS is overloaded as a segment-end directive.
  if (nextVal.equals_insensitive("ends") && StructInProgress.size() == 1) {
    Lex();
    return parseDirectiveEnds(IDVal, IDLoc);
  }
 
  // First, check the extension directive map to see if any extension has
  // registered itself to parse this directive.
  std::pair<MCAsmParserExtension *, DirectiveHandler> Handler =
      ExtensionDirectiveMap.lookup(nextVal.lower());
  if (Handler.first) {
    Lex();
    Lexer.UnLex(ID);
    return (*Handler.second)(Handler.first, nextVal, nextLoc);
  }
 
  // If no one else is interested in this directive, it must be
  // generic and familiar to this class.
  DirKindIt = DirectiveKindMap.find(nextVal.lower());
  DirKind = (DirKindIt == DirectiveKindMap.end())
                ? DK_NO_DIRECTIVE
                : DirKindIt->getValue();
  switch (DirKind) {
  default:
    break;
  case DK_ASSIGN:
  case DK_EQU:
  case DK_TEXTEQU:
    Lex();
    return parseDirectiveEquate(nextVal, IDVal, DirKind, IDLoc);
  case DK_BYTE:
    if (afterNextTok.is(AsmToken::Identifier) &&
        afterNextTok.getString().equals_insensitive("ptr")) {
      // Size directive; part of an instruction.
      break;
    }
    [[fallthrough]];
  case DK_SBYTE:
  case DK_DB:
    Lex();
    return parseDirectiveNamedValue(nextVal, 1, IDVal, IDLoc);
  case DK_WORD:
    if (afterNextTok.is(AsmToken::Identifier) &&
        afterNextTok.getString().equals_insensitive("ptr")) {
      // Size directive; part of an instruction.
      break;
    }
    [[fallthrough]];
  case DK_SWORD:
  case DK_DW:
    Lex();
    return parseDirectiveNamedValue(nextVal, 2, IDVal, IDLoc);
  case DK_DWORD:
    if (afterNextTok.is(AsmToken::Identifier) &&
        afterNextTok.getString().equals_insensitive("ptr")) {
      // Size directive; part of an instruction.
      break;
    }
    [[fallthrough]];
  case DK_SDWORD:
  case DK_DD:
    Lex();
    return parseDirectiveNamedValue(nextVal, 4, IDVal, IDLoc);
  case DK_FWORD:
    if (afterNextTok.is(AsmToken::Identifier) &&
        afterNextTok.getString().equals_insensitive("ptr")) {
      // Size directive; part of an instruction.
      break;
    }
    [[fallthrough]];
  case DK_DF:
    Lex();
    return parseDirectiveNamedValue(nextVal, 6, IDVal, IDLoc);
  case DK_QWORD:
    if (afterNextTok.is(AsmToken::Identifier) &&
        afterNextTok.getString().equals_insensitive("ptr")) {
      // Size directive; part of an instruction.
      break;
    }
    [[fallthrough]];
  case DK_SQWORD:
  case DK_DQ:
    Lex();
    return parseDirectiveNamedValue(nextVal, 8, IDVal, IDLoc);
  case DK_REAL4:
    Lex();
    return parseDirectiveNamedRealValue(nextVal, APFloat::IEEEsingle(), 4,
                                        IDVal, IDLoc);
  case DK_REAL8:
    Lex();
    return parseDirectiveNamedRealValue(nextVal, APFloat::IEEEdouble(), 8,
                                        IDVal, IDLoc);
  case DK_REAL10:
    Lex();
    return parseDirectiveNamedRealValue(nextVal, APFloat::x87DoubleExtended(),
                                        10, IDVal, IDLoc);
  case DK_STRUCT:
  case DK_UNION:
    Lex();
    return parseDirectiveStruct(nextVal, DirKind, IDVal, IDLoc);
  case DK_ENDS:
    Lex();
    return parseDirectiveEnds(IDVal, IDLoc);
  case DK_MACRO:
    Lex();
    return parseDirectiveMacro(IDVal, IDLoc);
  }
 
  // Finally, we check if this is allocating a variable with user-defined type.
  auto NextIt = Structs.find(nextVal.lower());
  if (NextIt != Structs.end()) {
    Lex();
    return parseDirectiveNamedStructValue(/*Structure=*/NextIt->getValue(),
                                          nextVal, nextLoc, IDVal);
  }
 
  // __asm _emit or __asm __emit
  if (ParsingMSInlineAsm && (IDVal == "_emit" || IDVal == "__emit" ||
                             IDVal == "_EMIT" || IDVal == "__EMIT"))
    return parseDirectiveMSEmit(IDLoc, Info, IDVal.size());
 
  // __asm align
  if (ParsingMSInlineAsm && (IDVal == "align" || IDVal == "ALIGN"))
    return parseDirectiveMSAlign(IDLoc, Info);
 
  if (ParsingMSInlineAsm && (IDVal == "even" || IDVal == "EVEN"))
    Info.AsmRewrites->emplace_back(AOK_EVEN, IDLoc, 4);
  if (checkForValidSection())
    return true;
 
  // Canonicalize the opcode to lower case.
  std::string OpcodeStr = IDVal.lower();
  ParseInstructionInfo IInfo(Info.AsmRewrites);
  bool ParseHadError = getTargetParser().parseInstruction(IInfo, OpcodeStr, ID,
                                                          Info.ParsedOperands);
  Info.ParseError = ParseHadError;
 
  // 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());
  }
 
  // Fail even if ParseInstruction erroneously returns false.
  if (hasPendingError() || ParseHadError)
    return true;
 
  // If we are generating dwarf for the current section then generate a .loc
  // directive for the instruction.
  if (!ParseHadError && enabledGenDwarfForAssembly() &&
      getContext().getGenDwarfSectionSyms().count(
          getStreamer().getCurrentSectionOnly())) {
    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 (!CppHashInfo.Filename.empty()) {
      unsigned FileNumber = getStreamer().emitDwarfFileDirective(
          0, StringRef(), CppHashInfo.Filename);
      getContext().setGenDwarfFileNumber(FileNumber);
 
      unsigned CppHashLocLineNo =
        SrcMgr.FindLineNumber(CppHashInfo.Loc, CppHashInfo.Buf);
      Line = CppHashInfo.LineNumber - 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 (!ParseHadError) {
    uint64_t ErrorInfo;
    if (getTargetParser().matchAndEmitInstruction(
            IDLoc, Info.Opcode, Info.ParsedOperands, Out, ErrorInfo,
            getTargetParser().isParsingMSInlineAsm()))
      return true;
  }
  return false;
}
 
// Parse and erase curly braces marking block start/end.
bool MasmParser::parseCurlyBlockScope(
    SmallVectorImpl<AsmRewrite> &AsmStrRewrites) {
  // Identify curly brace marking block start/end.
  if (Lexer.isNot(AsmToken::LCurly) && Lexer.isNot(AsmToken::RCurly))
    return false;
 
  SMLoc StartLoc = Lexer.getLoc();
  Lex(); // Eat the brace.
  if (Lexer.is(AsmToken::EndOfStatement))
    Lex(); // Eat EndOfStatement following the brace.
 
  // Erase the block start/end brace from the output asm string.
  AsmStrRewrites.emplace_back(AOK_Skip, StartLoc, Lexer.getLoc().getPointer() -
                                                  StartLoc.getPointer());
  return true;
}
 
/// parseCppHashLineFilenameComment as this:
///   ::= # number "filename"
bool MasmParser::parseCppHashLineFilenameComment(SMLoc L) {
  Lex(); // Eat the hash token.
  // Lexer only ever emits HashDirective if it fully formed if it's
  // done the checking already so this is an internal error.
  assert(getTok().is(AsmToken::Integer) &&
         "Lexing Cpp line comment: Expected Integer");
  int64_t LineNumber = getTok().getIntVal();
  Lex();
  assert(getTok().is(AsmToken::String) &&
         "Lexing Cpp line comment: Expected String");
  StringRef Filename = getTok().getString();
  Lex();
 
  // Get rid of the enclosing quotes.
  Filename = Filename.substr(1, Filename.size() - 2);
 
  // Save the SMLoc, Filename and LineNumber for later use by diagnostics
  // and possibly DWARF file info.
  CppHashInfo.Loc = L;
  CppHashInfo.Filename = Filename;
  CppHashInfo.LineNumber = LineNumber;
  CppHashInfo.Buf = CurBuffer;
  if (FirstCppHashFilename.empty())
    FirstCppHashFilename = Filename;
  return false;
}
 
/// will use the last parsed cpp hash line filename comment
/// for the Filename and LineNo if any in the diagnostic.
void MasmParser::DiagHandler(const SMDiagnostic &Diag, void *Context) {
  const MasmParser *Parser = static_cast<const MasmParser *>(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->CppHashInfo.Loc);
 
  // 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->CppHashInfo.LineNumber || &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
  // CppHashInfo.Loc and CppHashInfo.LineNumber relative to this Diag's SMLoc
  // for the diagnostic.
  const std::string &Filename = std::string(Parser->CppHashInfo.Filename);
 
  int DiagLocLineNo = DiagSrcMgr.FindLineNumber(DiagLoc, DiagBuf);
  int CppHashLocLineNo =
      Parser->SrcMgr.FindLineNumber(Parser->CppHashInfo.Loc, CppHashBuf);
  int LineNo =
      Parser->CppHashInfo.LineNumber - 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);
}
 
// This is similar to the IsIdentifierChar function in AsmLexer.cpp, but does
// not accept '.'.
static bool isMacroParameterChar(char C) {
  return isAlnum(C) || C == '_' || C == '$' || C == '@' || C == '?';
}
 
bool MasmParser::expandMacro(raw_svector_ostream &OS, StringRef Body,
                             ArrayRef<MCAsmMacroParameter> Parameters,
                             ArrayRef<MCAsmMacroArgument> A,
                             const std::vector<std::string> &Locals, SMLoc L) {
  unsigned NParameters = Parameters.size();
  if (NParameters != A.size())
    return Error(L, "Wrong number of arguments");
  StringMap<std::string> LocalSymbols;
  std::string Name;
  Name.reserve(6);
  for (StringRef Local : Locals) {
    raw_string_ostream LocalName(Name);
    LocalName << "??"
              << format_hex_no_prefix(LocalCounter++, 4, /*Upper=*/true);
    LocalSymbols.insert({Local, Name});
    Name.clear();
  }
 
  std::optional<char> CurrentQuote;
  while (!Body.empty()) {
    // Scan for the next substitution.
    std::size_t End = Body.size(), Pos = 0;
    std::size_t IdentifierPos = End;
    for (; Pos != End; ++Pos) {
      // Find the next possible macro parameter, including preceding a '&'
      // inside quotes.
      if (Body[Pos] == '&')
        break;
      if (isMacroParameterChar(Body[Pos])) {
        if (!CurrentQuote)
          break;
        if (IdentifierPos == End)
          IdentifierPos = Pos;
      } else {
        IdentifierPos = End;
      }
 
      // Track quotation status
      if (!CurrentQuote) {
        if (Body[Pos] == '\'' || Body[Pos] == '"')
          CurrentQuote = Body[Pos];
      } else if (Body[Pos] == CurrentQuote) {
        if (Pos + 1 != End && Body[Pos + 1] == CurrentQuote) {
          // Escaped quote, and quotes aren't identifier chars; skip
          ++Pos;
          continue;
        } else {
          CurrentQuote.reset();
        }
      }
    }
    if (IdentifierPos != End) {
      // We've recognized an identifier before an apostrophe inside quotes;
      // check once to see if we can expand it.
      Pos = IdentifierPos;
      IdentifierPos = End;
    }
 
    // Add the prefix.
    OS << Body.slice(0, Pos);
 
    // Check if we reached the end.
    if (Pos == End)
      break;
 
    unsigned I = Pos;
    bool InitialAmpersand = (Body[I] == '&');
    if (InitialAmpersand) {
      ++I;
      ++Pos;
    }
    while (I < End && isMacroParameterChar(Body[I]))
      ++I;
 
    const char *Begin = Body.data() + Pos;
    StringRef Argument(Begin, I - Pos);
    const std::string ArgumentLower = Argument.lower();
    unsigned Index = 0;
 
    for (; Index < NParameters; ++Index)
      if (Parameters[Index].Name.equals_insensitive(ArgumentLower))
        break;
 
    if (Index == NParameters) {
      if (InitialAmpersand)
        OS << '&';
      auto it = LocalSymbols.find(ArgumentLower);
      if (it != LocalSymbols.end())
        OS << it->second;
      else
        OS << Argument;
      Pos = I;
    } else {
      for (const AsmToken &Token : A[Index]) {
        // In MASM, you can write '%expr'.
        // The prefix '%' evaluates the expression 'expr'
        // and uses the result as a string (e.g. replace %(1+2) with the
        // string "3").
        // Here, we identify the integer token which is the result of the
        // absolute expression evaluation and replace it with its string
        // representation.
        if (Token.getString().front() == '%' && Token.is(AsmToken::Integer))
          // Emit an integer value to the buffer.
          OS << Token.getIntVal();
        else
          OS << Token.getString();
      }
 
      Pos += Argument.size();
      if (Pos < End && Body[Pos] == '&') {
        ++Pos;
      }
    }
    // Update the scan point.
    Body = Body.substr(Pos);
  }
 
  return false;
}
 
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::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;
};
 
} // end anonymous namespace
 
bool MasmParser::parseMacroArgument(const MCAsmMacroParameter *MP,
                                    MCAsmMacroArgument &MA,
                                    AsmToken::TokenKind EndTok) {
  if (MP && MP->Vararg) {
    if (Lexer.isNot(EndTok)) {
      SmallVector<StringRef, 1> Str = parseStringRefsTo(EndTok);
      for (StringRef S : Str) {
        MA.emplace_back(AsmToken::String, S);
      }
    }
    return false;
  }
 
  SMLoc StrLoc = Lexer.getLoc(), EndLoc;
  if (Lexer.is(AsmToken::Less) && isAngleBracketString(StrLoc, EndLoc)) {
    const char *StrChar = StrLoc.getPointer() + 1;
    const char *EndChar = EndLoc.getPointer() - 1;
    jumpToLoc(EndLoc, CurBuffer, EndStatementAtEOFStack.back());
    /// Eat from '<' to '>'.
    Lex();
    MA.emplace_back(AsmToken::String, StringRef(StrChar, EndChar - StrChar));
    return false;
  }
 
  unsigned ParenLevel = 0;
 
  // Darwin doesn't use spaces to delmit arguments.
  AsmLexerSkipSpaceRAII ScopedSkipSpace(Lexer, IsDarwin);
 
  bool SpaceEaten;
 
  while (true) {
    SpaceEaten = false;
    if (Lexer.is(AsmToken::Eof) || Lexer.is(AsmToken::Equal))
      return TokError("unexpected token");
 
    if (ParenLevel == 0) {
      if (Lexer.is(AsmToken::Comma))
        break;
 
      if (Lexer.is(AsmToken::Space)) {
        SpaceEaten = true;
        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()) && Lexer.isNot(EndTok)) {
          MA.push_back(getTok());
          Lex();
 
          // Whitespace after an operator can be ignored.
          if (Lexer.is(AsmToken::Space))
            Lex();
 
          continue;
        }
      }
      if (SpaceEaten)
        break;
    }
 
    // handleMacroEntry relies on not advancing the lexer here
    // to be able to fill in the remaining default parameter values
    if (Lexer.is(EndTok) && (EndTok != AsmToken::RParen || ParenLevel == 0))
      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());
    Lex();
  }
 
  if (ParenLevel != 0)
    return TokError("unbalanced parentheses in argument");
 
  if (MA.empty() && MP) {
    if (MP->Required) {
      return TokError("missing value for required parameter '" + MP->Name +
                      "'");
    } else {
      MA = MP->Value;
    }
  }
  return false;
}
 
// Parse the macro instantiation arguments.
bool MasmParser::parseMacroArguments(const MCAsmMacro *M,
                                     MCAsmMacroArguments &A,
                                     AsmToken::TokenKind EndTok) {
  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
  for (unsigned Parameter = 0; !NParameters || Parameter < NParameters;
       ++Parameter) {
    SMLoc IDLoc = Lexer.getLoc();
    MCAsmMacroParameter FA;
 
    if (Lexer.is(AsmToken::Identifier) && peekTok().is(AsmToken::Equal)) {
      if (parseIdentifier(FA.Name))
        return Error(IDLoc, "invalid argument identifier for formal argument");
 
      if (Lexer.isNot(AsmToken::Equal))
        return TokError("expected '=' after formal parameter identifier");
 
      Lex();
 
      NamedParametersFound = true;
    }
 
    if (NamedParametersFound && FA.Name.empty())
      return Error(IDLoc, "cannot mix positional and keyword arguments");
 
    unsigned PI = Parameter;
    if (!FA.Name.empty()) {
      assert(M && "expected macro to be defined");
      unsigned FAI = 0;
      for (FAI = 0; FAI < NParameters; ++FAI)
        if (M->Parameters[FAI].Name == FA.Name)
          break;
 
      if (FAI >= NParameters) {
        return Error(IDLoc, "parameter named '" + FA.Name +
                                "' does not exist for macro '" + M->Name + "'");
      }
      PI = FAI;
    }
    const MCAsmMacroParameter *MP = nullptr;
    if (M && PI < NParameters)
      MP = &M->Parameters[PI];
 
    SMLoc StrLoc = Lexer.getLoc();
    SMLoc EndLoc;
    if (Lexer.is(AsmToken::Percent)) {
      const MCExpr *AbsoluteExp;
      int64_t Value;
      /// Eat '%'.
      Lex();
      if (parseExpression(AbsoluteExp, EndLoc))
        return false;
      if (!AbsoluteExp->evaluateAsAbsolute(Value,
                                           getStreamer().getAssemblerPtr()))
        return Error(StrLoc, "expected absolute expression");
      const char *StrChar = StrLoc.getPointer();
      const char *EndChar = EndLoc.getPointer();
      AsmToken newToken(AsmToken::Integer,
                        StringRef(StrChar, EndChar - StrChar), Value);
      FA.Value.push_back(newToken);
    } else if (parseMacroArgument(MP, FA.Value, EndTok)) {
      if (M)
        return addErrorSuffix(" in '" + M->Name + "' macro");
      else
        return true;
    }
 
    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(EndTok)) {
      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");
}
 
bool MasmParser::handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc,
                                  AsmToken::TokenKind ArgumentEndTok) {
  // Arbitrarily limit macro nesting depth (default matches 'as'). We can
  // eliminate this, although we should protect against infinite loops.
  unsigned MaxNestingDepth = AsmMacroMaxNestingDepth;
  if (ActiveMacros.size() == MaxNestingDepth) {
    std::ostringstream MaxNestingDepthError;
    MaxNestingDepthError << "macros cannot be nested more than "
                         << MaxNestingDepth << " levels deep."
                         << " Use -asm-macro-max-nesting-depth to increase "
                            "this limit.";
    return TokError(MaxNestingDepthError.str());
  }
 
  MCAsmMacroArguments A;
  if (parseMacroArguments(M, A, ArgumentEndTok))
    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, M->Locals, getTok().getLoc()))
    return true;
 
  // We include the endm in the buffer as our cue to exit the macro
  // instantiation.
  OS << "endm\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());
  EndStatementAtEOFStack.push_back(true);
  Lex();
 
  return false;
}
 
void MasmParser::handleMacroExit() {
  // Jump to the token we should return to, and consume it.
  EndStatementAtEOFStack.pop_back();
  jumpToLoc(ActiveMacros.back()->ExitLoc, ActiveMacros.back()->ExitBuffer,
            EndStatementAtEOFStack.back());
  Lex();
 
  // Pop the instantiation entry.
  delete ActiveMacros.back();
  ActiveMacros.pop_back();
}
 
bool MasmParser::handleMacroInvocation(const MCAsmMacro *M, SMLoc NameLoc) {
  if (!M->IsFunction)
    return Error(NameLoc, "cannot invoke macro procedure as function");
 
  if (parseToken(AsmToken::LParen, "invoking macro function '" + M->Name +
                                       "' requires arguments in parentheses") ||
      handleMacroEntry(M, NameLoc, AsmToken::RParen))
    return true;
 
  // Parse all statements in the macro, retrieving the exit value when it ends.
  std::string ExitValue;
  SmallVector<AsmRewrite, 4> AsmStrRewrites;
  while (Lexer.isNot(AsmToken::Eof)) {
    ParseStatementInfo Info(&AsmStrRewrites);
    bool Parsed = parseStatement(Info, nullptr);
 
    if (!Parsed && Info.ExitValue) {
      ExitValue = std::move(*Info.ExitValue);
      break;
    }
 
    // If we have a Lexer Error we are on an Error Token. Load in Lexer Error
    // for printing ErrMsg via Lex() only if no (presumably better) parser error
    // exists.
    if (Parsed && !hasPendingError() && Lexer.getTok().is(AsmToken::Error)) {
      Lex();
    }
 
    // parseStatement returned true so may need to emit an error.
    printPendingErrors();
 
    // Skipping to the next line if needed.
    if (Parsed && !getLexer().isAtStartOfStatement())
      eatToEndOfStatement();
  }
 
  // Consume the right-parenthesis on the other side of the arguments.
  if (parseRParen())
    return true;
 
  // Exit values may require lexing, unfortunately. We construct a new buffer to
  // hold the exit value.
  std::unique_ptr<MemoryBuffer> MacroValue =
      MemoryBuffer::getMemBufferCopy(ExitValue, "<macro-value>");
 
  // Jump from this location to the instantiated exit value, and prime the
  // lexer.
  CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(MacroValue), Lexer.getLoc());
  Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer(), nullptr,
                  /*EndStatementAtEOF=*/false);
  EndStatementAtEOFStack.push_back(false);
  Lex();
 
  return false;
}
 
/// parseIdentifier:
///   ::= identifier
///   ::= string
bool MasmParser::parseIdentifier(StringRef &Res,
                                 IdentifierPositionKind Position) {
  // 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.
 
    AsmToken nextTok = peekTok(false);
 
    if (nextTok.isNot(AsmToken::Identifier))
      return true;
 
    // We have a '$' or '@' followed by an identifier, make sure they are adjacent.
    if (PrefixLoc.getPointer() + 1 != nextTok.getLoc().getPointer())
      return true;
 
    // eat $ or @
    Lexer.Lex(); // Lexer's Lex guarantees consecutive token.
    // Construct the joined identifier and consume the token.
    Res =
        StringRef(PrefixLoc.getPointer(), getTok().getIdentifier().size() + 1);
    Lex(); // Parser Lex to maintain invariants.
    return false;
  }
 
  if (Lexer.isNot(AsmToken::Identifier) && Lexer.isNot(AsmToken::String))
    return true;
 
  Res = getTok().getIdentifier();
 
  // Consume the identifier token - but if parsing certain directives, avoid
  // lexical expansion of the next token.
  ExpandKind ExpandNextToken = ExpandMacros;
  if (Position == StartOfStatement &&
      StringSwitch<bool>(Res)
          .CaseLower("echo", true)
          .CasesLower("ifdef", "ifndef", "elseifdef", "elseifndef", true)
          .Default(false)) {
    ExpandNextToken = DoNotExpandMacros;
  }
  Lex(ExpandNextToken);
 
  return false;
}
 
/// parseDirectiveEquate:
///  ::= name "=" expression
///    | name "equ" expression    (not redefinable)
///    | name "equ" text-list
///    | name "textequ" text-list (redefinability unspecified)
bool MasmParser::parseDirectiveEquate(StringRef IDVal, StringRef Name,
                                      DirectiveKind DirKind, SMLoc NameLoc) {
  auto BuiltinIt = BuiltinSymbolMap.find(Name.lower());
  if (BuiltinIt != BuiltinSymbolMap.end())
    return Error(NameLoc, "cannot redefine a built-in symbol");
 
  Variable &Var = Variables[Name.lower()];
  if (Var.Name.empty()) {
    Var.Name = Name;
  }
 
  SMLoc StartLoc = Lexer.getLoc();
  if (DirKind == DK_EQU || DirKind == DK_TEXTEQU) {
    // "equ" and "textequ" both allow text expressions.
    std::string Value;
    std::string TextItem;
    if (!parseTextItem(TextItem)) {
      Value += TextItem;
 
      // Accept a text-list, not just one text-item.
      auto parseItem = [&]() -> bool {
        if (parseTextItem(TextItem))
          return TokError("expected text item");
        Value += TextItem;
        return false;
      };
      if (parseOptionalToken(AsmToken::Comma) && parseMany(parseItem))
        return addErrorSuffix(" in '" + Twine(IDVal) + "' directive");
 
      if (!Var.IsText || Var.TextValue != Value) {
        switch (Var.Redefinable) {
        case Variable::NOT_REDEFINABLE:
          return Error(getTok().getLoc(), "invalid variable redefinition");
        case Variable::WARN_ON_REDEFINITION:
          if (Warning(NameLoc, "redefining '" + Name +
                                   "', already defined on the command line")) {
            return true;
          }
          break;
        default:
          break;
        }
      }
      Var.IsText = true;
      Var.TextValue = Value;
      Var.Redefinable = Variable::REDEFINABLE;
 
      return false;
    }
  }
  if (DirKind == DK_TEXTEQU)
    return TokError("expected <text> in '" + Twine(IDVal) + "' directive");
 
  // Parse as expression assignment.
  const MCExpr *Expr;
  SMLoc EndLoc;
  if (parseExpression(Expr, EndLoc))
    return addErrorSuffix(" in '" + Twine(IDVal) + "' directive");
  StringRef ExprAsString = StringRef(
      StartLoc.getPointer(), EndLoc.getPointer() - StartLoc.getPointer());
 
  int64_t Value;
  if (!Expr->evaluateAsAbsolute(Value, getStreamer().getAssemblerPtr())) {
    if (DirKind == DK_ASSIGN)
      return Error(
          StartLoc,
          "expected absolute expression; not all symbols have known values",
          {StartLoc, EndLoc});
 
    // Not an absolute expression; define as a text replacement.
    if (!Var.IsText || Var.TextValue != ExprAsString) {
      switch (Var.Redefinable) {
      case Variable::NOT_REDEFINABLE:
        return Error(getTok().getLoc(), "invalid variable redefinition");
      case Variable::WARN_ON_REDEFINITION:
        if (Warning(NameLoc, "redefining '" + Name +
                                 "', already defined on the command line")) {
          return true;
        }
        break;
      default:
        break;
      }
    }
 
    Var.IsText = true;
    Var.TextValue = ExprAsString.str();
    Var.Redefinable = Variable::REDEFINABLE;
 
    return false;
  }
 
  MCSymbol *Sym = getContext().getOrCreateSymbol(Var.Name);
 
  const MCConstantExpr *PrevValue =
      Sym->isVariable() ? dyn_cast_or_null<MCConstantExpr>(
                              Sym->getVariableValue(/*SetUsed=*/false))
                        : nullptr;
  if (Var.IsText || !PrevValue || PrevValue->getValue() != Value) {
    switch (Var.Redefinable) {
    case Variable::NOT_REDEFINABLE:
      return Error(getTok().getLoc(), "invalid variable redefinition");
    case Variable::WARN_ON_REDEFINITION:
      if (Warning(NameLoc, "redefining '" + Name +
                               "', already defined on the command line")) {
        return true;
      }
      break;
    default:
      break;
    }
  }
 
  Var.IsText = false;
  Var.TextValue.clear();
  Var.Redefinable = (DirKind == DK_ASSIGN) ? Variable::REDEFINABLE
                                           : Variable::NOT_REDEFINABLE;
 
  Sym->setRedefinable(Var.Redefinable != Variable::NOT_REDEFINABLE);
  Sym->setVariableValue(Expr);
  Sym->setExternal(false);
 
  return false;
}
 
bool MasmParser::parseEscapedString(std::string &Data) {
  if (check(getTok().isNot(AsmToken::String), "expected string"))
    return true;
 
  Data = "";
  char Quote = getTok().getString().front();
  StringRef Str = getTok().getStringContents();
  Data.reserve(Str.size());
  for (size_t i = 0, e = Str.size(); i != e; ++i) {
    Data.push_back(Str[i]);
    if (Str[i] == Quote) {
      // MASM treats doubled delimiting quotes as an escaped delimiting quote.
      // If we're escaping the string's trailing delimiter, we're definitely
      // missing a quotation mark.
      if (i + 1 == Str.size())
        return Error(getTok().getLoc(), "missing quotation mark in string");
      if (Str[i + 1] == Quote)
        ++i;
    }
  }
 
  Lex();
  return false;
}
 
bool MasmParser::parseAngleBracketString(std::string &Data) {
  SMLoc EndLoc, StartLoc = getTok().getLoc();
  if (isAngleBracketString(StartLoc, EndLoc)) {
    const char *StartChar = StartLoc.getPointer() + 1;
    const char *EndChar = EndLoc.getPointer() - 1;
    jumpToLoc(EndLoc, CurBuffer, EndStatementAtEOFStack.back());
    // Eat from '<' to '>'.
    Lex();
 
    Data = angleBracketString(StringRef(StartChar, EndChar - StartChar));
    return false;
  }
  return true;
}
 
/// textItem ::= textLiteral | textMacroID | % constExpr
bool MasmParser::parseTextItem(std::string &Data) {
  switch (getTok().getKind()) {
  default:
    return true;
  case AsmToken::Percent: {
    int64_t Res;
    if (parseToken(AsmToken::Percent) || parseAbsoluteExpression(Res))
      return true;
    Data = std::to_string(Res);
    return false;
  }
  case AsmToken::Less:
  case AsmToken::LessEqual:
  case AsmToken::LessLess:
  case AsmToken::LessGreater:
    return parseAngleBracketString(Data);
  case AsmToken::Identifier: {
    // This must be a text macro; we need to expand it accordingly.
    StringRef ID;
    SMLoc StartLoc = getTok().getLoc();
    if (parseIdentifier(ID))
      return true;
    Data = ID.str();
 
    bool Expanded = false;
    while (true) {
      // Try to resolve as a built-in text macro
      auto BuiltinIt = BuiltinSymbolMap.find(ID.lower());
      if (BuiltinIt != BuiltinSymbolMap.end()) {
        std::optional<std::string> BuiltinText =
            evaluateBuiltinTextMacro(BuiltinIt->getValue(), StartLoc);
        if (!BuiltinText) {
          // Not a text macro; break without substituting
          break;
        }
        Data = std::move(*BuiltinText);
        ID = StringRef(Data);
        Expanded = true;
        continue;
      }
 
      // Try to resolve as a variable text macro
      auto VarIt = Variables.find(ID.lower());
      if (VarIt != Variables.end()) {
        const Variable &Var = VarIt->getValue();
        if (!Var.IsText) {
          // Not a text macro; break without substituting
          break;
        }
        Data = Var.TextValue;
        ID = StringRef(Data);
        Expanded = true;
        continue;
      }
 
      break;
    }
 
    if (!Expanded) {
      // Not a text macro; not usable in TextItem context. Since we haven't used
      // the token, put it back for better error recovery.
      getLexer().UnLex(AsmToken(AsmToken::Identifier, ID));
      return true;
    }
    return false;
  }
  }
  llvm_unreachable("unhandled token kind");
}
 
/// parseDirectiveAscii:
///   ::= ( .ascii | .asciz | .string ) [ "string" ( , "string" )* ]
bool MasmParser::parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) {
  auto parseOp = [&]() -> bool {
    std::string Data;
    if (checkForValidSection() || parseEscapedString(Data))
      return true;
    getStreamer().emitBytes(Data);
    if (ZeroTerminated)
      getStreamer().emitBytes(StringRef("\0", 1));
    return false;
  };
 
  if (parseMany(parseOp))
    return addErrorSuffix(" in '" + Twine(IDVal) + "' directive");
  return false;
}
 
bool MasmParser::emitIntValue(const MCExpr *Value, unsigned Size) {
  // Special case constant expressions to match code generator.
  if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
    assert(Size <= 8 && "Invalid size");
    int64_t IntValue = MCE->getValue();
    if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue))
      return Error(MCE->getLoc(), "out of range literal value");
    getStreamer().emitIntValue(IntValue, Size);
  } else {
    const MCSymbolRefExpr *MSE = dyn_cast<MCSymbolRefExpr>(Value);
    if (MSE && MSE->getSymbol().getName() == "?") {
      // ? initializer; treat as 0.
      getStreamer().emitIntValue(0, Size);
    } else {
      getStreamer().emitValue(Value, Size, Value->getLoc());
    }
  }
  return false;
}
 
bool MasmParser::parseScalarInitializer(unsigned Size,
                                        SmallVectorImpl<const MCExpr *> &Values,
                                        unsigned StringPadLength) {
  if (Size == 1 && getTok().is(AsmToken::String)) {
    std::string Value;
    if (parseEscapedString(Value))
      return true;
    // Treat each character as an initializer.
    for (const unsigned char CharVal : Value)
      Values.push_back(MCConstantExpr::create(CharVal, getContext()));
 
    // Pad the string with spaces to the specified length.
    for (size_t i = Value.size(); i < StringPadLength; ++i)
      Values.push_back(MCConstantExpr::create(' ', getContext()));
  } else {
    const MCExpr *Value;
    if (parseExpression(Value))
      return true;
    if (getTok().is(AsmToken::Identifier) &&
        getTok().getString().equals_insensitive("dup")) {
      Lex(); // Eat 'dup'.
      const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
      if (!MCE)
        return Error(Value->getLoc(),
                     "cannot repeat value a non-constant number of times");
      const int64_t Repetitions = MCE->getValue();
      if (Repetitions < 0)
        return Error(Value->getLoc(),
                     "cannot repeat value a negative number of times");
 
      SmallVector<const MCExpr *, 1> DuplicatedValues;
      if (parseToken(AsmToken::LParen,
                     "parentheses required for 'dup' contents") ||
          parseScalarInstList(Size, DuplicatedValues) || parseRParen())
        return true;
 
      for (int i = 0; i < Repetitions; ++i)
        Values.append(DuplicatedValues.begin(), DuplicatedValues.end());
    } else {
      Values.push_back(Value);
    }
  }
  return false;
}
 
bool MasmParser::parseScalarInstList(unsigned Size,
                                     SmallVectorImpl<const MCExpr *> &Values,
                                     const AsmToken::TokenKind EndToken) {
  while (getTok().isNot(EndToken) &&
         (EndToken != AsmToken::Greater ||
          getTok().isNot(AsmToken::GreaterGreater))) {
    parseScalarInitializer(Size, Values);
 
    // If we see a comma, continue, and allow line continuation.
    if (!parseOptionalToken(AsmToken::Comma))
      break;
    parseOptionalToken(AsmToken::EndOfStatement);
  }
  return false;
}
 
bool MasmParser::emitIntegralValues(unsigned Size, unsigned *Count) {
  SmallVector<const MCExpr *, 1> Values;
  if (checkForValidSection() || parseScalarInstList(Size, Values))
    return true;
 
  for (const auto *Value : Values) {
    emitIntValue(Value, Size);
  }
  if (Count)
    *Count = Values.size();
  return false;
}
 
// Add a field to the current structure.
bool MasmParser::addIntegralField(StringRef Name, unsigned Size) {
  StructInfo &Struct = StructInProgress.back();
  FieldInfo &Field = Struct.addField(Name, FT_INTEGRAL, Size);
  IntFieldInfo &IntInfo = Field.Contents.IntInfo;
 
  Field.Type = Size;
 
  if (parseScalarInstList(Size, IntInfo.Values))
    return true;
 
  Field.SizeOf = Field.Type * IntInfo.Values.size();
  Field.LengthOf = IntInfo.Values.size();
  const unsigned FieldEnd = Field.Offset + Field.SizeOf;
  if (!Struct.IsUnion) {
    Struct.NextOffset = FieldEnd;
  }
  Struct.Size = std::max(Struct.Size, FieldEnd);
  return false;
}
 
/// parseDirectiveValue
///  ::= (byte | word | ... ) [ expression (, expression)* ]
bool MasmParser::parseDirectiveValue(StringRef IDVal, unsigned Size) {
  if (StructInProgress.empty()) {
    // Initialize data value.
    if (emitIntegralValues(Size))
      return addErrorSuffix(" in '" + Twine(IDVal) + "' directive");
  } else if (addIntegralField("", Size)) {
    return addErrorSuffix(" in '" + Twine(IDVal) + "' directive");
  }
 
  return false;
}
 
/// parseDirectiveNamedValue
///  ::= name (byte | word | ... ) [ expression (, expression)* ]
bool MasmParser::parseDirectiveNamedValue(StringRef TypeName, unsigned Size,
                                          StringRef Name, SMLoc NameLoc) {
  if (StructInProgress.empty()) {
    // Initialize named data value.
    MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
    getStreamer().emitLabel(Sym);
    unsigned Count;
    if (emitIntegralValues(Size, &Count))
      return addErrorSuffix(" in '" + Twine(TypeName) + "' directive");
 
    AsmTypeInfo Type;
    Type.Name = TypeName;
    Type.Size = Size * Count;
    Type.ElementSize = Size;
    Type.Length = Count;
    KnownType[Name.lower()] = Type;
  } else if (addIntegralField(Name, Size)) {
    return addErrorSuffix(" in '" + Twine(TypeName) + "' directive");
  }
 
  return false;
}
 
static bool parseHexOcta(MasmParser &Asm, uint64_t &hi, uint64_t &lo) {
  if (Asm.getTok().isNot(AsmToken::Integer) &&
      Asm.getTok().isNot(AsmToken::BigNum))
    return Asm.TokError("unknown token in expression");
  SMLoc ExprLoc = Asm.getTok().getLoc();
  APInt IntValue = Asm.getTok().getAPIntVal();
  Asm.Lex();
  if (!IntValue.isIntN(128))
    return Asm.Error(ExprLoc, "out of range literal value");
  if (!IntValue.isIntN(64)) {
    hi = IntValue.getHiBits(IntValue.getBitWidth() - 64).getZExtValue();
    lo = IntValue.getLoBits(64).getZExtValue();
  } else {
    hi = 0;
    lo = IntValue.getZExtValue();
  }
  return false;
}
 
bool MasmParser::parseRealValue(const fltSemantics &Semantics, APInt &Res) {
  // We don't truly support arithmetic on floating point expressions, so we
  // have to manually parse unary prefixes.
  bool IsNeg = false;
  SMLoc SignLoc;
  if (getLexer().is(AsmToken::Minus)) {
    SignLoc = getLexer().getLoc();
    Lexer.Lex();
    IsNeg = true;
  } else if (getLexer().is(AsmToken::Plus)) {
    SignLoc = getLexer().getLoc();
    Lexer.Lex();
  }
 
  if (Lexer.is(AsmToken::Error))
    return TokError(Lexer.getErr());
  if (Lexer.isNot(AsmToken::Integer) && Lexer.isNot(AsmToken::Real) &&
      Lexer.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.equals_insensitive("infinity") || IDVal.equals_insensitive("inf"))
      Value = APFloat::getInf(Semantics);
    else if (IDVal.equals_insensitive("nan"))
      Value = APFloat::getNaN(Semantics, false, ~0);
    else if (IDVal.equals_insensitive("?"))
      Value = APFloat::getZero(Semantics);
    else
      return TokError("invalid floating point literal");
  } else if (IDVal.consume_back("r") || IDVal.consume_back("R")) {
    // MASM hexadecimal floating-point literal; no APFloat conversion needed.
    // To match ML64.exe, ignore the initial sign.
    unsigned SizeInBits = Value.getSizeInBits(Semantics);
    if (SizeInBits != (IDVal.size() << 2))
      return TokError("invalid floating point literal");
 
    // Consume the numeric token.
    Lex();
 
    Res = APInt(SizeInBits, IDVal, 16);
    if (SignLoc.isValid())
      return Warning(SignLoc, "MASM-style hex floats ignore explicit sign");
    return false;
  } else if (errorToBool(
                 Value.convertFromString(IDVal, APFloat::rmNearestTiesToEven)
                     .takeError())) {
    return TokError("invalid floating point literal");
  }
  if (IsNeg)
    Value.changeSign();
 
  // Consume the numeric token.
  Lex();
 
  Res = Value.bitcastToAPInt();
 
  return false;
}
 
bool MasmParser::parseRealInstList(const fltSemantics &Semantics,
                                   SmallVectorImpl<APInt> &ValuesAsInt,
                                   const AsmToken::TokenKind EndToken) {
  while (getTok().isNot(EndToken) ||
         (EndToken == AsmToken::Greater &&
          getTok().isNot(AsmToken::GreaterGreater))) {
    const AsmToken NextTok = peekTok();
    if (NextTok.is(AsmToken::Identifier) &&
        NextTok.getString().equals_insensitive("dup")) {
      const MCExpr *Value;
      if (parseExpression(Value) || parseToken(AsmToken::Identifier))
        return true;
      const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
      if (!MCE)
        return Error(Value->getLoc(),
                     "cannot repeat value a non-constant number of times");
      const int64_t Repetitions = MCE->getValue();
      if (Repetitions < 0)
        return Error(Value->getLoc(),
                     "cannot repeat value a negative number of times");
 
      SmallVector<APInt, 1> DuplicatedValues;
      if (parseToken(AsmToken::LParen,
                     "parentheses required for 'dup' contents") ||
          parseRealInstList(Semantics, DuplicatedValues) || parseRParen())
        return true;
 
      for (int i = 0; i < Repetitions; ++i)
        ValuesAsInt.append(DuplicatedValues.begin(), DuplicatedValues.end());
    } else {
      APInt AsInt;
      if (parseRealValue(Semantics, AsInt))
        return true;
      ValuesAsInt.push_back(AsInt);
    }
 
    // Continue if we see a comma. (Also, allow line continuation.)
    if (!parseOptionalToken(AsmToken::Comma))
      break;
    parseOptionalToken(AsmToken::EndOfStatement);
  }
 
  return false;
}
 
// Initialize real data values.
bool MasmParser::emitRealValues(const fltSemantics &Semantics,
                                unsigned *Count) {
  if (checkForValidSection())
    return true;
 
  SmallVector<APInt, 1> ValuesAsInt;
  if (parseRealInstList(Semantics, ValuesAsInt))
    return true;
 
  for (const APInt &AsInt : ValuesAsInt) {
    getStreamer().emitIntValue(AsInt);
  }
  if (Count)
    *Count = ValuesAsInt.size();
  return false;
}
 
// Add a real field to the current struct.
bool MasmParser::addRealField(StringRef Name, const fltSemantics &Semantics,
                              size_t Size) {
  StructInfo &Struct = StructInProgress.back();
  FieldInfo &Field = Struct.addField(Name, FT_REAL, Size);
  RealFieldInfo &RealInfo = Field.Contents.RealInfo;
 
  Field.SizeOf = 0;
 
  if (parseRealInstList(Semantics, RealInfo.AsIntValues))
    return true;
 
  Field.Type = RealInfo.AsIntValues.back().getBitWidth() / 8;
  Field.LengthOf = RealInfo.AsIntValues.size();
  Field.SizeOf = Field.Type * Field.LengthOf;
 
  const unsigned FieldEnd = Field.Offset + Field.SizeOf;
  if (!Struct.IsUnion) {
    Struct.NextOffset = FieldEnd;
  }
  Struct.Size = std::max(Struct.Size, FieldEnd);
  return false;
}
 
/// parseDirectiveRealValue
///  ::= (real4 | real8 | real10) [ expression (, expression)* ]
bool MasmParser::parseDirectiveRealValue(StringRef IDVal,
                                         const fltSemantics &Semantics,
                                         size_t Size) {
  if (StructInProgress.empty()) {
    // Initialize data value.
    if (emitRealValues(Semantics))
      return addErrorSuffix(" in '" + Twine(IDVal) + "' directive");
  } else if (addRealField("", Semantics, Size)) {
    return addErrorSuffix(" in '" + Twine(IDVal) + "' directive");
  }
  return false;
}
 
/// parseDirectiveNamedRealValue
///  ::= name (real4 | real8 | real10) [ expression (, expression)* ]
bool MasmParser::parseDirectiveNamedRealValue(StringRef TypeName,
                                              const fltSemantics &Semantics,
                                              unsigned Size, StringRef Name,
                                              SMLoc NameLoc) {
  if (StructInProgress.empty()) {
    // Initialize named data value.
    MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
    getStreamer().emitLabel(Sym);
    unsigned Count;
    if (emitRealValues(Semantics, &Count))
      return addErrorSuffix(" in '" + TypeName + "' directive");
 
    AsmTypeInfo Type;
    Type.Name = TypeName;
    Type.Size = Size * Count;
    Type.ElementSize = Size;
    Type.Length = Count;
    KnownType[Name.lower()] = Type;
  } else if (addRealField(Name, Semantics, Size)) {
    return addErrorSuffix(" in '" + TypeName + "' directive");
  }
  return false;
}
 
bool MasmParser::parseOptionalAngleBracketOpen() {
  const AsmToken Tok = getTok();
  if (parseOptionalToken(AsmToken::LessLess)) {
    AngleBracketDepth++;
    Lexer.UnLex(AsmToken(AsmToken::Less, Tok.getString().substr(1)));
    return true;
  } else if (parseOptionalToken(AsmToken::LessGreater)) {
    AngleBracketDepth++;
    Lexer.UnLex(AsmToken(AsmToken::Greater, Tok.getString().substr(1)));
    return true;
  } else if (parseOptionalToken(AsmToken::Less)) {
    AngleBracketDepth++;
    return true;
  }
 
  return false;
}
 
bool MasmParser::parseAngleBracketClose(const Twine &Msg) {
  const AsmToken Tok = getTok();
  if (parseOptionalToken(AsmToken::GreaterGreater)) {
    Lexer.UnLex(AsmToken(AsmToken::Greater, Tok.getString().substr(1)));
  } else if (parseToken(AsmToken::Greater, Msg)) {
    return true;
  }
  AngleBracketDepth--;
  return false;
}
 
bool MasmParser::parseFieldInitializer(const FieldInfo &Field,
                                       const IntFieldInfo &Contents,
                                       FieldInitializer &Initializer) {
  SMLoc Loc = getTok().getLoc();
 
  SmallVector<const MCExpr *, 1> Values;
  if (parseOptionalToken(AsmToken::LCurly)) {
    if (Field.LengthOf == 1 && Field.Type > 1)
      return Error(Loc, "Cannot initialize scalar field with array value");
    if (parseScalarInstList(Field.Type, Values, AsmToken::RCurly) ||
        parseToken(AsmToken::RCurly))
      return true;
  } else if (parseOptionalAngleBracketOpen()) {
    if (Field.LengthOf == 1 && Field.Type > 1)
      return Error(Loc, "Cannot initialize scalar field with array value");
    if (parseScalarInstList(Field.Type, Values, AsmToken::Greater) ||
        parseAngleBracketClose())
      return true;
  } else if (Field.LengthOf > 1 && Field.Type > 1) {
    return Error(Loc, "Cannot initialize array field with scalar value");
  } else if (parseScalarInitializer(Field.Type, Values,
                                    /*StringPadLength=*/Field.LengthOf)) {
    return true;
  }
 
  if (Values.size() > Field.LengthOf) {
    return Error(Loc, "Initializer too long for field; expected at most " +
                          std::to_string(Field.LengthOf) + " elements, got " +
                          std::to_string(Values.size()));
  }
  // Default-initialize all remaining values.
  Values.append(Contents.Values.begin() + Values.size(), Contents.Values.end());
 
  Initializer = FieldInitializer(std::move(Values));
  return false;
}
 
bool MasmParser::parseFieldInitializer(const FieldInfo &Field,
                                       const RealFieldInfo &Contents,
                                       FieldInitializer &Initializer) {
  const fltSemantics *Semantics;
  switch (Field.Type) {
  case 4:
    Semantics = &APFloat::IEEEsingle();
    break;
  case 8:
    Semantics = &APFloat::IEEEdouble();
    break;
  case 10:
    Semantics = &APFloat::x87DoubleExtended();
    break;
  default:
    llvm_unreachable("unknown real field type");
  }
 
  SMLoc Loc = getTok().getLoc();
 
  SmallVector<APInt, 1> AsIntValues;
  if (parseOptionalToken(AsmToken::LCurly)) {
    if (Field.LengthOf == 1)
      return Error(Loc, "Cannot initialize scalar field with array value");
    if (parseRealInstList(*Semantics, AsIntValues, AsmToken::RCurly) ||
        parseToken(AsmToken::RCurly))
      return true;
  } else if (parseOptionalAngleBracketOpen()) {
    if (Field.LengthOf == 1)
      return Error(Loc, "Cannot initialize scalar field with array value");
    if (parseRealInstList(*Semantics, AsIntValues, AsmToken::Greater) ||
        parseAngleBracketClose())
      return true;
  } else if (Field.LengthOf > 1) {
    return Error(Loc, "Cannot initialize array field with scalar value");
  } else {
    AsIntValues.emplace_back();
    if (parseRealValue(*Semantics, AsIntValues.back()))
      return true;
  }
 
  if (AsIntValues.size() > Field.LengthOf) {
    return Error(Loc, "Initializer too long for field; expected at most " +
                          std::to_string(Field.LengthOf) + " elements, got " +
                          std::to_string(AsIntValues.size()));
  }
  // Default-initialize all remaining values.
  AsIntValues.append(Contents.AsIntValues.begin() + AsIntValues.size(),
                     Contents.AsIntValues.end());
 
  Initializer = FieldInitializer(std::move(AsIntValues));
  return false;
}
 
bool MasmParser::parseFieldInitializer(const FieldInfo &Field,
                                       const StructFieldInfo &Contents,
                                       FieldInitializer &Initializer) {
  SMLoc Loc = getTok().getLoc();
 
  std::vector<StructInitializer> Initializers;
  if (Field.LengthOf > 1) {
    if (parseOptionalToken(AsmToken::LCurly)) {
      if (parseStructInstList(Contents.Structure, Initializers,
                              AsmToken::RCurly) ||
          parseToken(AsmToken::RCurly))
        return true;
    } else if (parseOptionalAngleBracketOpen()) {
      if (parseStructInstList(Contents.Structure, Initializers,
                              AsmToken::Greater) ||
          parseAngleBracketClose())
        return true;
    } else {
      return Error(Loc, "Cannot initialize array field with scalar value");
    }
  } else {
    Initializers.emplace_back();
    if (parseStructInitializer(Contents.Structure, Initializers.back()))
      return true;
  }
 
  if (Initializers.size() > Field.LengthOf) {
    return Error(Loc, "Initializer too long for field; expected at most " +
                          std::to_string(Field.LengthOf) + " elements, got " +
                          std::to_string(Initializers.size()));
  }
  // Default-initialize all remaining values.
  Initializers.insert(Initializers.end(),
                      Contents.Initializers.begin() + Initializers.size(),
                      Contents.Initializers.end());
 
  Initializer = FieldInitializer(std::move(Initializers), Contents.Structure);
  return false;
}
 
bool MasmParser::parseFieldInitializer(const FieldInfo &Field,
                                       FieldInitializer &Initializer) {
  switch (Field.Contents.FT) {
  case FT_INTEGRAL:
    return parseFieldInitializer(Field, Field.Contents.IntInfo, Initializer);
  case FT_REAL:
    return parseFieldInitializer(Field, Field.Contents.RealInfo, Initializer);
  case FT_STRUCT:
    return parseFieldInitializer(Field, Field.Contents.StructInfo, Initializer);
  }
  llvm_unreachable("Unhandled FieldType enum");
}
 
bool MasmParser::parseStructInitializer(const StructInfo &Structure,
                                        StructInitializer &Initializer) {
  const AsmToken FirstToken = getTok();
 
  std::optional<AsmToken::TokenKind> EndToken;
  if (parseOptionalToken(AsmToken::LCurly)) {
    EndToken = AsmToken::RCurly;
  } else if (parseOptionalAngleBracketOpen()) {
    EndToken = AsmToken::Greater;
    AngleBracketDepth++;
  } else if (FirstToken.is(AsmToken::Identifier) &&
             FirstToken.getString() == "?") {
    // ? initializer; leave EndToken uninitialized to treat as empty.
    if (parseToken(AsmToken::Identifier))
      return true;
  } else {
    return Error(FirstToken.getLoc(), "Expected struct initializer");
  }
 
  auto &FieldInitializers = Initializer.FieldInitializers;
  size_t FieldIndex = 0;
  if (EndToken) {
    // Initialize all fields with given initializers.
    while (getTok().isNot(*EndToken) && FieldIndex < Structure.Fields.size()) {
      const FieldInfo &Field = Structure.Fields[FieldIndex++];
      if (parseOptionalToken(AsmToken::Comma)) {
        // Empty initializer; use the default and continue. (Also, allow line
        // continuation.)
        FieldInitializers.push_back(Field.Contents);
        parseOptionalToken(AsmToken::EndOfStatement);
        continue;
      }
      FieldInitializers.emplace_back(Field.Contents.FT);
      if (parseFieldInitializer(Field, FieldInitializers.back()))
        return true;
 
      // Continue if we see a comma. (Also, allow line continuation.)
      SMLoc CommaLoc = getTok().getLoc();
      if (!parseOptionalToken(AsmToken::Comma))
        break;
      if (FieldIndex == Structure.Fields.size())
        return Error(CommaLoc, "'" + Structure.Name +
                                   "' initializer initializes too many fields");
      parseOptionalToken(AsmToken::EndOfStatement);
    }
  }
  // Default-initialize all remaining fields.
  for (const FieldInfo &Field : llvm::drop_begin(Structure.Fields, FieldIndex))
    FieldInitializers.push_back(Field.Contents);
 
  if (EndToken) {
    if (*EndToken == AsmToken::Greater)
      return parseAngleBracketClose();
 
    return parseToken(*EndToken);
  }
 
  return false;
}
 
bool MasmParser::parseStructInstList(
    const StructInfo &Structure, std::vector<StructInitializer> &Initializers,
    const AsmToken::TokenKind EndToken) {
  while (getTok().isNot(EndToken) ||
         (EndToken == AsmToken::Greater &&
          getTok().isNot(AsmToken::GreaterGreater))) {
    const AsmToken NextTok = peekTok();
    if (NextTok.is(AsmToken::Identifier) &&
        NextTok.getString().equals_insensitive("dup")) {
      const MCExpr *Value;
      if (parseExpression(Value) || parseToken(AsmToken::Identifier))
        return true;
      const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
      if (!MCE)
        return Error(Value->getLoc(),
                     "cannot repeat value a non-constant number of times");
      const int64_t Repetitions = MCE->getValue();
      if (Repetitions < 0)
        return Error(Value->getLoc(),
                     "cannot repeat value a negative number of times");
 
      std::vector<StructInitializer> DuplicatedValues;
      if (parseToken(AsmToken::LParen,
                     "parentheses required for 'dup' contents") ||
          parseStructInstList(Structure, DuplicatedValues) || parseRParen())
        return true;
 
      for (int i = 0; i < Repetitions; ++i)
        llvm::append_range(Initializers, DuplicatedValues);
    } else {
      Initializers.emplace_back();
      if (parseStructInitializer(Structure, Initializers.back()))
        return true;
    }
 
    // Continue if we see a comma. (Also, allow line continuation.)
    if (!parseOptionalToken(AsmToken::Comma))
      break;
    parseOptionalToken(AsmToken::EndOfStatement);
  }
 
  return false;
}
 
bool MasmParser::emitFieldValue(const FieldInfo &Field,
                                const IntFieldInfo &Contents) {
  // Default-initialize all values.
  for (const MCExpr *Value : Contents.Values) {
    if (emitIntValue(Value, Field.Type))
      return true;
  }
  return false;
}
 
bool MasmParser::emitFieldValue(const FieldInfo &Field,
                                const RealFieldInfo &Contents) {
  for (const APInt &AsInt : Contents.AsIntValues) {
    getStreamer().emitIntValue(AsInt.getLimitedValue(),
                               AsInt.getBitWidth() / 8);
  }
  return false;
}
 
bool MasmParser::emitFieldValue(const FieldInfo &Field,
                                const StructFieldInfo &Contents) {
  for (const auto &Initializer : Contents.Initializers) {
    size_t Index = 0, Offset = 0;
    for (const auto &SubField : Contents.Structure.Fields) {
      getStreamer().emitZeros(SubField.Offset - Offset);
      Offset = SubField.Offset + SubField.SizeOf;
      emitFieldInitializer(SubField, Initializer.FieldInitializers[Index++]);
    }
  }
  return false;
}
 
bool MasmParser::emitFieldValue(const FieldInfo &Field) {
  switch (Field.Contents.FT) {
  case FT_INTEGRAL:
    return emitFieldValue(Field, Field.Contents.IntInfo);
  case FT_REAL:
    return emitFieldValue(Field, Field.Contents.RealInfo);
  case FT_STRUCT:
    return emitFieldValue(Field, Field.Contents.StructInfo);
  }
  llvm_unreachable("Unhandled FieldType enum");
}
 
bool MasmParser::emitFieldInitializer(const FieldInfo &Field,
                                      const IntFieldInfo &Contents,
                                      const IntFieldInfo &Initializer) {
  for (const auto &Value : Initializer.Values) {
    if (emitIntValue(Value, Field.Type))
      return true;
  }
  // Default-initialize all remaining values.
  for (const auto &Value :
           llvm::drop_begin(Contents.Values, Initializer.Values.size())) {
    if (emitIntValue(Value, Field.Type))
      return true;
  }
  return false;
}
 
bool MasmParser::emitFieldInitializer(const FieldInfo &Field,
                                      const RealFieldInfo &Contents,
                                      const RealFieldInfo &Initializer) {
  for (const auto &AsInt : Initializer.AsIntValues) {
    getStreamer().emitIntValue(AsInt.getLimitedValue(),
                               AsInt.getBitWidth() / 8);
  }
  // Default-initialize all remaining values.
  for (const auto &AsInt :
       llvm::drop_begin(Contents.AsIntValues, Initializer.AsIntValues.size())) {
    getStreamer().emitIntValue(AsInt.getLimitedValue(),
                               AsInt.getBitWidth() / 8);
  }
  return false;
}
 
bool MasmParser::emitFieldInitializer(const FieldInfo &Field,
                                      const StructFieldInfo &Contents,
                                      const StructFieldInfo &Initializer) {
  for (const auto &Init : Initializer.Initializers) {
    if (emitStructInitializer(Contents.Structure, Init))
      return true;
  }
  // Default-initialize all remaining values.
  for (const auto &Init : llvm::drop_begin(Contents.Initializers,
                                           Initializer.Initializers.size())) {
    if (emitStructInitializer(Contents.Structure, Init))
      return true;
  }
  return false;
}
 
bool MasmParser::emitFieldInitializer(const FieldInfo &Field,
                                      const FieldInitializer &Initializer) {
  switch (Field.Contents.FT) {
  case FT_INTEGRAL:
    return emitFieldInitializer(Field, Field.Contents.IntInfo,
                                Initializer.IntInfo);
  case FT_REAL:
    return emitFieldInitializer(Field, Field.Contents.RealInfo,
                                Initializer.RealInfo);
  case FT_STRUCT:
    return emitFieldInitializer(Field, Field.Contents.StructInfo,
                                Initializer.StructInfo);
  }
  llvm_unreachable("Unhandled FieldType enum");
}
 
bool MasmParser::emitStructInitializer(const StructInfo &Structure,
                                       const StructInitializer &Initializer) {
  if (!Structure.Initializable)
    return Error(getLexer().getLoc(),
                 "cannot initialize a value of type '" + Structure.Name +
                     "'; 'org' was used in the type's declaration");
  size_t Index = 0, Offset = 0;
  for (const auto &Init : Initializer.FieldInitializers) {
    const auto &Field = Structure.Fields[Index++];
    getStreamer().emitZeros(Field.Offset - Offset);
    Offset = Field.Offset + Field.SizeOf;
    if (emitFieldInitializer(Field, Init))
      return true;
  }
  // Default-initialize all remaining fields.
  for (const auto &Field : llvm::drop_begin(
           Structure.Fields, Initializer.FieldInitializers.size())) {
    getStreamer().emitZeros(Field.Offset - Offset);
    Offset = Field.Offset + Field.SizeOf;
    if (emitFieldValue(Field))
      return true;
  }
  // Add final padding.
  if (Offset != Structure.Size)
    getStreamer().emitZeros(Structure.Size - Offset);
  return false;
}
 
// Set data values from initializers.
bool MasmParser::emitStructValues(const StructInfo &Structure,
                                  unsigned *Count) {
  std::vector<StructInitializer> Initializers;
  if (parseStructInstList(Structure, Initializers))
    return true;
 
  for (const auto &Initializer : Initializers) {
    if (emitStructInitializer(Structure, Initializer))
      return true;
  }
 
  if (Count)
    *Count = Initializers.size();
  return false;
}
 
// Declare a field in the current struct.
bool MasmParser::addStructField(StringRef Name, const StructInfo &Structure) {
  StructInfo &OwningStruct = StructInProgress.back();
  FieldInfo &Field =
      OwningStruct.addField(Name, FT_STRUCT, Structure.AlignmentSize);
  StructFieldInfo &StructInfo = Field.Contents.StructInfo;
 
  StructInfo.Structure = Structure;
  Field.Type = Structure.Size;
 
  if (parseStructInstList(Structure, StructInfo.Initializers))
    return true;
 
  Field.LengthOf = StructInfo.Initializers.size();
  Field.SizeOf = Field.Type * Field.LengthOf;
 
  const unsigned FieldEnd = Field.Offset + Field.SizeOf;
  if (!OwningStruct.IsUnion) {
    OwningStruct.NextOffset = FieldEnd;
  }
  OwningStruct.Size = std::max(OwningStruct.Size, FieldEnd);
 
  return false;
}
 
/// parseDirectiveStructValue
///  ::= struct-id (<struct-initializer> | {struct-initializer})
///                [, (<struct-initializer> | {struct-initializer})]*
bool MasmParser::parseDirectiveStructValue(const StructInfo &Structure,
                                           StringRef Directive, SMLoc DirLoc) {
  if (StructInProgress.empty()) {
    if (emitStructValues(Structure))
      return true;
  } else if (addStructField("", Structure)) {
    return addErrorSuffix(" in '" + Twine(Directive) + "' directive");
  }
 
  return false;
}
 
/// parseDirectiveNamedValue
///  ::= name (byte | word | ... ) [ expression (, expression)* ]
bool MasmParser::parseDirectiveNamedStructValue(const StructInfo &Structure,
                                                StringRef Directive,
                                                SMLoc DirLoc, StringRef Name) {
  if (StructInProgress.empty()) {
    // Initialize named data value.
    MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
    getStreamer().emitLabel(Sym);
    unsigned Count;
    if (emitStructValues(Structure, &Count))
      return true;
    AsmTypeInfo Type;
    Type.Name = Structure.Name;
    Type.Size = Structure.Size * Count;
    Type.ElementSize = Structure.Size;
    Type.Length = Count;
    KnownType[Name.lower()] = Type;
  } else if (addStructField(Name, Structure)) {
    return addErrorSuffix(" in '" + Twine(Directive) + "' directive");
  }
 
  return false;
}
 
/// parseDirectiveStruct
///  ::= <name> (STRUC | STRUCT | UNION) [fieldAlign] [, NONUNIQUE]
///      (dataDir | generalDir | offsetDir | nestedStruct)+
///      <name> ENDS
////// dataDir = data declaration
////// offsetDir = EVEN, ORG, ALIGN
bool MasmParser::parseDirectiveStruct(StringRef Directive,
                                      DirectiveKind DirKind, StringRef Name,
                                      SMLoc NameLoc) {
  // We ignore NONUNIQUE; we do not support OPTION M510 or OPTION OLDSTRUCTS
  // anyway, so all field accesses must be qualified.
  AsmToken NextTok = getTok();
  int64_t AlignmentValue = 1;
  if (NextTok.isNot(AsmToken::Comma) &&
      NextTok.isNot(AsmToken::EndOfStatement) &&
      parseAbsoluteExpression(AlignmentValue)) {
    return addErrorSuffix(" in alignment value for '" + Twine(Directive) +
                          "' directive");
  }
  if (!isPowerOf2_64(AlignmentValue)) {
    return Error(NextTok.getLoc(), "alignment must be a power of two; was " +
                                       std::to_string(AlignmentValue));
  }
 
  StringRef Qualifier;
  SMLoc QualifierLoc;
  if (parseOptionalToken(AsmToken::Comma)) {
    QualifierLoc = getTok().getLoc();
    if (parseIdentifier(Qualifier))
      return addErrorSuffix(" in '" + Twine(Directive) + "' directive");
    if (!Qualifier.equals_insensitive("nonunique"))
      return Error(QualifierLoc, "Unrecognized qualifier for '" +
                                     Twine(Directive) +
                                     "' directive; expected none or NONUNIQUE");
  }
 
  if (parseEOL())
    return addErrorSuffix(" in '" + Twine(Directive) + "' directive");
 
  StructInProgress.emplace_back(Name, DirKind == DK_UNION, AlignmentValue);
  return false;
}
 
/// parseDirectiveNestedStruct
///  ::= (STRUC | STRUCT | UNION) [name]
///      (dataDir | generalDir | offsetDir | nestedStruct)+
///      ENDS
bool MasmParser::parseDirectiveNestedStruct(StringRef Directive,
                                            DirectiveKind DirKind) {
  if (StructInProgress.empty())
    return TokError("missing name in top-level '" + Twine(Directive) +
                    "' directive");
 
  StringRef Name;
  if (getTok().is(AsmToken::Identifier)) {
    Name = getTok().getIdentifier();
    parseToken(AsmToken::Identifier);
  }
  if (parseEOL())
    return addErrorSuffix(" in '" + Twine(Directive) + "' directive");
 
  // Reserve space to ensure Alignment doesn't get invalidated when
  // StructInProgress grows.
  StructInProgress.reserve(StructInProgress.size() + 1);
  StructInProgress.emplace_back(Name, DirKind == DK_UNION,
                                StructInProgress.back().Alignment);
  return false;
}
 
bool MasmParser::parseDirectiveEnds(StringRef Name, SMLoc NameLoc) {
  if (StructInProgress.empty())
    return Error(NameLoc, "ENDS directive without matching STRUC/STRUCT/UNION");
  if (StructInProgress.size() > 1)
    return Error(NameLoc, "unexpected name in nested ENDS directive");
  if (StructInProgress.back().Name.compare_insensitive(Name))
    return Error(NameLoc, "mismatched name in ENDS directive; expected '" +
                              StructInProgress.back().Name + "'");
  StructInfo Structure = StructInProgress.pop_back_val();
  // Pad to make the structure's size divisible by the smaller of its alignment
  // and the size of its largest field.
  Structure.Size = llvm::alignTo(
      Structure.Size, std::min(Structure.Alignment, Structure.AlignmentSize));
  Structs[Name.lower()] = Structure;
 
  if (parseEOL())
    return addErrorSuffix(" in ENDS directive");
 
  return false;
}
 
bool MasmParser::parseDirectiveNestedEnds() {
  if (StructInProgress.empty())
    return TokError("ENDS directive without matching STRUC/STRUCT/UNION");
  if (StructInProgress.size() == 1)
    return TokError("missing name in top-level ENDS directive");
 
  if (parseEOL())
    return addErrorSuffix(" in nested ENDS directive");
 
  StructInfo Structure = StructInProgress.pop_back_val();
  // Pad to make the structure's size divisible by its alignment.
  Structure.Size = llvm::alignTo(Structure.Size, Structure.Alignment);
 
  StructInfo &ParentStruct = StructInProgress.back();
  if (Structure.Name.empty()) {
    // Anonymous substructures' fields are addressed as if they belong to the
    // parent structure - so we transfer them to the parent here.
    const size_t OldFields = ParentStruct.Fields.size();
    ParentStruct.Fields.insert(
        ParentStruct.Fields.end(),
        std::make_move_iterator(Structure.Fields.begin()),
        std::make_move_iterator(Structure.Fields.end()));
    for (const auto &FieldByName : Structure.FieldsByName) {
      ParentStruct.FieldsByName[FieldByName.getKey()] =
          FieldByName.getValue() + OldFields;
    }
 
    unsigned FirstFieldOffset = 0;
    if (!Structure.Fields.empty() && !ParentStruct.IsUnion) {
      FirstFieldOffset = llvm::alignTo(
          ParentStruct.NextOffset,
          std::min(ParentStruct.Alignment, Structure.AlignmentSize));
    }
 
    if (ParentStruct.IsUnion) {
      ParentStruct.Size = std::max(ParentStruct.Size, Structure.Size);
    } else {
      for (auto &Field : llvm::drop_begin(ParentStruct.Fields, OldFields))
        Field.Offset += FirstFieldOffset;
 
      const unsigned StructureEnd = FirstFieldOffset + Structure.Size;
      if (!ParentStruct.IsUnion) {
        ParentStruct.NextOffset = StructureEnd;
      }
      ParentStruct.Size = std::max(ParentStruct.Size, StructureEnd);
    }
  } else {
    FieldInfo &Field = ParentStruct.addField(Structure.Name, FT_STRUCT,
                                             Structure.AlignmentSize);
    StructFieldInfo &StructInfo = Field.Contents.StructInfo;
    Field.Type = Structure.Size;
    Field.LengthOf = 1;
    Field.SizeOf = Structure.Size;
 
    const unsigned StructureEnd = Field.Offset + Field.SizeOf;
    if (!ParentStruct.IsUnion) {
      ParentStruct.NextOffset = StructureEnd;
    }
    ParentStruct.Size = std::max(ParentStruct.Size, StructureEnd);
 
    StructInfo.Structure = Structure;
    StructInfo.Initializers.emplace_back();
    auto &FieldInitializers = StructInfo.Initializers.back().FieldInitializers;
    for (const auto &SubField : Structure.Fields) {
      FieldInitializers.push_back(SubField.Contents);
    }
  }
 
  return false;
}
 
/// parseDirectiveOrg
///  ::= org expression
bool MasmParser::parseDirectiveOrg() {
  const MCExpr *Offset;
  SMLoc OffsetLoc = Lexer.getLoc();
  if (checkForValidSection() || parseExpression(Offset))
    return true;
  if (parseEOL())
    return addErrorSuffix(" in 'org' directive");
 
  if (StructInProgress.empty()) {
    // Not in a struct; change the offset for the next instruction or data
    if (checkForValidSection())
      return addErrorSuffix(" in 'org' directive");
 
    getStreamer().emitValueToOffset(Offset, 0, OffsetLoc);
  } else {
    // Offset the next field of this struct
    StructInfo &Structure = StructInProgress.back();
    int64_t OffsetRes;
    if (!Offset->evaluateAsAbsolute(OffsetRes, getStreamer().getAssemblerPtr()))
      return Error(OffsetLoc,
                   "expected absolute expression in 'org' directive");
    if (OffsetRes < 0)
      return Error(
          OffsetLoc,
          "expected non-negative value in struct's 'org' directive; was " +
              std::to_string(OffsetRes));
    Structure.NextOffset = static_cast<unsigned>(OffsetRes);
 
    // ORG-affected structures cannot be initialized
    Structure.Initializable = false;
  }
 
  return false;
}
 
bool MasmParser::emitAlignTo(int64_t Alignment) {
  if (StructInProgress.empty()) {
    // Not in a struct; align the next instruction or data
    if (checkForValidSection())
      return true;
 
    // Check whether we should use optimal code alignment for this align
    // directive.
    const MCSection *Section = getStreamer().getCurrentSectionOnly();
    assert(Section && "must have section to emit alignment");
    if (Section->useCodeAlign()) {
      getStreamer().emitCodeAlignment(Align(Alignment),
                                      &getTargetParser().getSTI(),
                                      /*MaxBytesToEmit=*/0);
    } else {
      // FIXME: Target specific behavior about how the "extra" bytes are filled.
      getStreamer().emitValueToAlignment(Align(Alignment), /*Value=*/0,
                                         /*ValueSize=*/1,
                                         /*MaxBytesToEmit=*/0);
    }
  } else {
    // Align the next field of this struct
    StructInfo &Structure = StructInProgress.back();
    Structure.NextOffset = llvm::alignTo(Structure.NextOffset, Alignment);
  }
 
  return false;
}
 
/// parseDirectiveAlign
///  ::= align expression
bool MasmParser::parseDirectiveAlign() {
  SMLoc AlignmentLoc = getLexer().getLoc();
  int64_t Alignment;
 
  // Ignore empty 'align' directives.
  if (getTok().is(AsmToken::EndOfStatement)) {
    return Warning(AlignmentLoc,
                   "align directive with no operand is ignored") &&
           parseEOL();
  }
  if (parseAbsoluteExpression(Alignment) || parseEOL())
    return addErrorSuffix(" in align directive");
 
  // Always emit an alignment here even if we throw an error.
  bool ReturnVal = false;
 
  // Reject alignments that aren't either a power of two or zero, for ML.exe
  // compatibility. Alignment of zero is silently rounded up to one.
  if (Alignment == 0)
    Alignment = 1;
  if (!isPowerOf2_64(Alignment))
    ReturnVal |= Error(AlignmentLoc, "alignment must be a power of 2; was " +
                                         std::to_string(Alignment));
 
  if (emitAlignTo(Alignment))
    ReturnVal |= addErrorSuffix(" in align directive");
 
  return ReturnVal;
}
 
/// parseDirectiveEven
///  ::= even
bool MasmParser::parseDirectiveEven() {
  if (parseEOL() || emitAlignTo(2))
    return addErrorSuffix(" in even directive");
 
  return false;
}
 
/// parseDirectiveFile
/// ::= .file filename
/// ::= .file number [directory] filename [md5 checksum] [source source-text]
bool MasmParser::parseDirectiveFile(SMLoc DirectiveLoc) {
  // FIXME: I'm not sure what this is.
  int64_t FileNumber = -1;
  if (getLexer().is(AsmToken::Integer)) {
    FileNumber = getTok().getIntVal();
    Lex();
 
    if (FileNumber < 0)
      return TokError("negative file number");
  }
 
  std::string Path;
 
  // Usually the directory and filename together, otherwise just the directory.
  // Allow the strings to have escaped octal character sequence.
  if (check(getTok().isNot(AsmToken::String),
            "unexpected token in '.file' directive") ||
      parseEscapedString(Path))
    return true;
 
  StringRef Directory;
  StringRef Filename;
  std::string FilenameData;
  if (getLexer().is(AsmToken::String)) {
    if (check(FileNumber == -1,
              "explicit path specified, but no file number") ||
        parseEscapedString(FilenameData))
      return true;
    Filename = FilenameData;
    Directory = Path;
  } else {
    Filename = Path;
  }
 
  uint64_t MD5Hi, MD5Lo;
  bool HasMD5 = false;
 
  std::optional<StringRef> Source;
  bool HasSource = false;
  std::string SourceString;
 
  while (!parseOptionalToken(AsmToken::EndOfStatement)) {
    StringRef Keyword;
    if (check(getTok().isNot(AsmToken::Identifier),
              "unexpected token in '.file' directive") ||
        parseIdentifier(Keyword))
      return true;
    if (Keyword == "md5") {
      HasMD5 = true;
      if (check(FileNumber == -1,
                "MD5 checksum specified, but no file number") ||
          parseHexOcta(*this, MD5Hi, MD5Lo))
        return true;
    } else if (Keyword == "source") {
      HasSource = true;
      if (check(FileNumber == -1,
                "source specified, but no file number") ||
          check(getTok().isNot(AsmToken::String),
                "unexpected token in '.file' directive") ||
          parseEscapedString(SourceString))
        return true;
    } else {
      return TokError("unexpected token in '.file' directive");
    }
  }
 
  if (FileNumber == -1) {
    // Ignore the directive if there is no number and the target doesn't support
    // numberless .file directives. This allows some portability of assembler
    // between different object file formats.
    if (getContext().getAsmInfo()->hasSingleParameterDotFile())
      getStreamer().emitFileDirective(Filename);
  } else {
    // In case there is a -g option as well as debug info from directive .file,
    // we turn off the -g option, directly use the existing debug info instead.
    // Throw away any implicit file table for the assembler source.
    if (Ctx.getGenDwarfForAssembly()) {
      Ctx.getMCDwarfLineTable(0).resetFileTable();
      Ctx.setGenDwarfForAssembly(false);
    }
 
    std::optional<MD5::MD5Result> CKMem;
    if (HasMD5) {
      MD5::MD5Result Sum;
      for (unsigned i = 0; i != 8; ++i) {
        Sum[i] = uint8_t(MD5Hi >> ((7 - i) * 8));
        Sum[i + 8] = uint8_t(MD5Lo >> ((7 - i) * 8));
      }
      CKMem = Sum;
    }
    if (HasSource) {
      char *SourceBuf = static_cast<char *>(Ctx.allocate(SourceString.size()));
      memcpy(SourceBuf, SourceString.data(), SourceString.size());
      Source = StringRef(SourceBuf, SourceString.size());
    }
    if (FileNumber == 0) {
      if (Ctx.getDwarfVersion() < 5)
        return Warning(DirectiveLoc, "file 0 not supported prior to DWARF-5");
      getStreamer().emitDwarfFile0Directive(Directory, Filename, CKMem, Source);
    } else {
      Expected<unsigned> FileNumOrErr = getStreamer().tryEmitDwarfFileDirective(
          FileNumber, Directory, Filename, CKMem, Source);
      if (!FileNumOrErr)
        return Error(DirectiveLoc, toString(FileNumOrErr.takeError()));
    }
    // Alert the user if there are some .file directives with MD5 and some not.
    // But only do that once.
    if (!ReportedInconsistentMD5 && !Ctx.isDwarfMD5UsageConsistent(0)) {
      ReportedInconsistentMD5 = true;
      return Warning(DirectiveLoc, "inconsistent use of MD5 checksums");
    }
  }
 
  return false;
}
 
/// parseDirectiveLine
/// ::= .line [number]
bool MasmParser::parseDirectiveLine() {
  int64_t LineNumber;
  if (getLexer().is(AsmToken::Integer)) {
    if (parseIntToken(LineNumber, "unexpected token in '.line' directive"))
      return true;
    (void)LineNumber;
    // FIXME: Do something with the .line.
  }
  if (parseEOL())
    return true;
 
  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 MasmParser::parseDirectiveLoc() {
  int64_t FileNumber = 0, LineNumber = 0;
  SMLoc Loc = getTok().getLoc();
  if (parseIntToken(FileNumber, "unexpected token in '.loc' directive") ||
      check(FileNumber < 1 && Ctx.getDwarfVersion() < 5, Loc,
            "file number less than one in '.loc' directive") ||
      check(!getContext().isValidDwarfFileNumber(FileNumber), Loc,
            "unassigned file number in '.loc' directive"))
    return true;
 
  // optional
  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();
  }
 
  auto PrevFlags = getContext().getCurrentDwarfLoc().getFlags();
  unsigned Flags = PrevFlags & DWARF2_FLAG_IS_STMT;
  unsigned Isa = 0;
  int64_t Discriminator = 0;
 
  auto parseLocOp = [&]() -> bool {
    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");
    }
    return false;
  };
 
  if (parseMany(parseLocOp, false /*hasComma*/))
    return true;
 
  getStreamer().emitDwarfLocDirective(FileNumber, LineNumber, ColumnPos, Flags,
                                      Isa, Discriminator, StringRef());
 
  return false;
}
 
/// parseDirectiveStabs
/// ::= .stabs string, number, number, number
bool MasmParser::parseDirectiveStabs() {
  return TokError("unsupported directive '.stabs'");
}
 
/// parseDirectiveCVFile
/// ::= .cv_file number filename [checksum] [checksumkind]
bool MasmParser::parseDirectiveCVFile() {
  SMLoc FileNumberLoc = getTok().getLoc();
  int64_t FileNumber;
  std::string Filename;
  std::string Checksum;
  int64_t ChecksumKind = 0;
 
  if (parseIntToken(FileNumber,
                    "expected file number in '.cv_file' directive") ||
      check(FileNumber < 1, FileNumberLoc, "file number less than one") ||
      check(getTok().isNot(AsmToken::String),
            "unexpected token in '.cv_file' directive") ||
      parseEscapedString(Filename))
    return true;
  if (!parseOptionalToken(AsmToken::EndOfStatement)) {
    if (check(getTok().isNot(AsmToken::String),
              "unexpected token in '.cv_file' directive") ||
        parseEscapedString(Checksum) ||
        parseIntToken(ChecksumKind,
                      "expected checksum kind in '.cv_file' directive") ||
        parseEOL())
      return true;
  }
 
  Checksum = fromHex(Checksum);
  void *CKMem = Ctx.allocate(Checksum.size(), 1);
  memcpy(CKMem, Checksum.data(), Checksum.size());
  ArrayRef<uint8_t> ChecksumAsBytes(reinterpret_cast<const uint8_t *>(CKMem),
                                    Checksum.size());
 
  if (!getStreamer().emitCVFileDirective(FileNumber, Filename, ChecksumAsBytes,
                                         static_cast<uint8_t>(ChecksumKind)))
    return Error(FileNumberLoc, "file number already allocated");
 
  return false;
}
 
bool MasmParser::parseCVFunctionId(int64_t &FunctionId,
                                   StringRef DirectiveName) {
  SMLoc Loc;
  return parseTokenLoc(Loc) ||
         parseIntToken(FunctionId, "expected function id in '" + DirectiveName +
                                       "' directive") ||
         check(FunctionId < 0 || FunctionId >= UINT_MAX, Loc,
               "expected function id within range [0, UINT_MAX)");
}
 
bool MasmParser::parseCVFileId(int64_t &FileNumber, StringRef DirectiveName) {
  SMLoc Loc;
  return parseTokenLoc(Loc) ||
         parseIntToken(FileNumber, "expected integer in '" + DirectiveName +
                                       "' directive") ||
         check(FileNumber < 1, Loc, "file number less than one in '" +
                                        DirectiveName + "' directive") ||
         check(!getCVContext().isValidFileNumber(FileNumber), Loc,
               "unassigned file number in '" + DirectiveName + "' directive");
}
 
/// parseDirectiveCVFuncId
/// ::= .cv_func_id FunctionId
///
/// Introduces a function ID that can be used with .cv_loc.
bool MasmParser::parseDirectiveCVFuncId() {
  SMLoc FunctionIdLoc = getTok().getLoc();
  int64_t FunctionId;
 
  if (parseCVFunctionId(FunctionId, ".cv_func_id") || parseEOL())
    return true;
 
  if (!getStreamer().emitCVFuncIdDirective(FunctionId))
    return Error(FunctionIdLoc, "function id already allocated");
 
  return false;
}
 
/// parseDirectiveCVInlineSiteId
/// ::= .cv_inline_site_id FunctionId
///         "within" IAFunc
///         "inlined_at" IAFile IALine [IACol]
///
/// Introduces a function ID that can be used with .cv_loc. Includes "inlined
/// at" source location information for use in the line table of the caller,
/// whether the caller is a real function or another inlined call site.
bool MasmParser::parseDirectiveCVInlineSiteId() {
  SMLoc FunctionIdLoc = getTok().getLoc();
  int64_t FunctionId;
  int64_t IAFunc;
  int64_t IAFile;
  int64_t IALine;
  int64_t IACol = 0;
 
  // FunctionId
  if (parseCVFunctionId(FunctionId, ".cv_inline_site_id"))
    return true;
 
  // "within"
  if (check((getLexer().isNot(AsmToken::Identifier) ||
             getTok().getIdentifier() != "within"),
            "expected 'within' identifier in '.cv_inline_site_id' directive"))
    return true;
  Lex();
 
  // IAFunc
  if (parseCVFunctionId(IAFunc, ".cv_inline_site_id"))
    return true;
 
  // "inlined_at"
  if (check((getLexer().isNot(AsmToken::Identifier) ||
             getTok().getIdentifier() != "inlined_at"),
            "expected 'inlined_at' identifier in '.cv_inline_site_id' "
            "directive") )
    return true;
  Lex();
 
  // IAFile IALine
  if (parseCVFileId(IAFile, ".cv_inline_site_id") ||
      parseIntToken(IALine, "expected line number after 'inlined_at'"))
    return true;
 
  // [IACol]
  if (getLexer().is(AsmToken::Integer)) {
    IACol = getTok().getIntVal();
    Lex();
  }
 
  if (parseEOL())
    return true;
 
  if (!getStreamer().emitCVInlineSiteIdDirective(FunctionId, IAFunc, IAFile,
                                                 IALine, IACol, FunctionIdLoc))
    return Error(FunctionIdLoc, "function id already allocated");
 
  return false;
}
 
/// parseDirectiveCVLoc
/// ::= .cv_loc FunctionId FileNumber [LineNumber] [ColumnPos] [prologue_end]
///                                [is_stmt 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 MasmParser::parseDirectiveCVLoc() {
  SMLoc DirectiveLoc = getTok().getLoc();
  int64_t FunctionId, FileNumber;
  if (parseCVFunctionId(FunctionId, ".cv_loc") ||
      parseCVFileId(FileNumber, ".cv_loc"))
    return true;
 
  int64_t LineNumber = 0;
  if (getLexer().is(AsmToken::Integer)) {
    LineNumber = getTok().getIntVal();
    if (LineNumber < 0)
      return TokError("line number less than zero in '.cv_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 '.cv_loc' directive");
    Lex();
  }
 
  bool PrologueEnd = false;
  uint64_t IsStmt = 0;
 
  auto parseOp = [&]() -> bool {
    StringRef Name;
    SMLoc Loc = getTok().getLoc();
    if (parseIdentifier(Name))
      return TokError("unexpected token in '.cv_loc' directive");
    if (Name == "prologue_end")
      PrologueEnd = true;
    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.
      IsStmt = ~0ULL;
      if (const auto *MCE = dyn_cast<MCConstantExpr>(Value))
        IsStmt = MCE->getValue();
 
      if (IsStmt > 1)
        return Error(Loc, "is_stmt value not 0 or 1");
    } else {
      return Error(Loc, "unknown sub-directive in '.cv_loc' directive");
    }
    return false;
  };
 
  if (parseMany(parseOp, false /*hasComma*/))
    return true;
 
  getStreamer().emitCVLocDirective(FunctionId, FileNumber, LineNumber,
                                   ColumnPos, PrologueEnd, IsStmt, StringRef(),
                                   DirectiveLoc);
  return false;
}
 
/// parseDirectiveCVLinetable
/// ::= .cv_linetable FunctionId, FnStart, FnEnd
bool MasmParser::parseDirectiveCVLinetable() {
  int64_t FunctionId;
  StringRef FnStartName, FnEndName;
  SMLoc Loc = getTok().getLoc();
  if (parseCVFunctionId(FunctionId, ".cv_linetable") ||
      parseToken(AsmToken::Comma,
                 "unexpected token in '.cv_linetable' directive") ||
      parseTokenLoc(Loc) || check(parseIdentifier(FnStartName), Loc,
                                  "expected identifier in directive") ||
      parseToken(AsmToken::Comma,
                 "unexpected token in '.cv_linetable' directive") ||
      parseTokenLoc(Loc) || check(parseIdentifier(FnEndName), Loc,
                                  "expected identifier in directive"))
    return true;
 
  MCSymbol *FnStartSym = getContext().getOrCreateSymbol(FnStartName);
  MCSymbol *FnEndSym = getContext().getOrCreateSymbol(FnEndName);
 
  getStreamer().emitCVLinetableDirective(FunctionId, FnStartSym, FnEndSym);
  return false;
}
 
/// parseDirectiveCVInlineLinetable
/// ::= .cv_inline_linetable PrimaryFunctionId FileId LineNum FnStart FnEnd
bool MasmParser::parseDirectiveCVInlineLinetable() {
  int64_t PrimaryFunctionId, SourceFileId, SourceLineNum;
  StringRef FnStartName, FnEndName;
  SMLoc Loc = getTok().getLoc();
  if (parseCVFunctionId(PrimaryFunctionId, ".cv_inline_linetable") ||
      parseTokenLoc(Loc) ||
      parseIntToken(
          SourceFileId,
          "expected SourceField in '.cv_inline_linetable' directive") ||
      check(SourceFileId <= 0, Loc,
            "File id less than zero in '.cv_inline_linetable' directive") ||
      parseTokenLoc(Loc) ||
      parseIntToken(
          SourceLineNum,
          "expected SourceLineNum in '.cv_inline_linetable' directive") ||
      check(SourceLineNum < 0, Loc,
            "Line number less than zero in '.cv_inline_linetable' directive") ||
      parseTokenLoc(Loc) || check(parseIdentifier(FnStartName), Loc,
                                  "expected identifier in directive") ||
      parseTokenLoc(Loc) || check(parseIdentifier(FnEndName), Loc,
                                  "expected identifier in directive"))
    return true;
 
  if (parseEOL())
    return true;
 
  MCSymbol *FnStartSym = getContext().getOrCreateSymbol(FnStartName);
  MCSymbol *FnEndSym = getContext().getOrCreateSymbol(FnEndName);
  getStreamer().emitCVInlineLinetableDirective(PrimaryFunctionId, SourceFileId,
                                               SourceLineNum, FnStartSym,
                                               FnEndSym);
  return false;
}
 
void MasmParser::initializeCVDefRangeTypeMap() {
  CVDefRangeTypeMap["reg"] = CVDR_DEFRANGE_REGISTER;
  CVDefRangeTypeMap["frame_ptr_rel"] = CVDR_DEFRANGE_FRAMEPOINTER_REL;
  CVDefRangeTypeMap["subfield_reg"] = CVDR_DEFRANGE_SUBFIELD_REGISTER;
  CVDefRangeTypeMap["reg_rel"] = CVDR_DEFRANGE_REGISTER_REL;
}
 
/// parseDirectiveCVDefRange
/// ::= .cv_def_range RangeStart RangeEnd (GapStart GapEnd)*, bytes*
bool MasmParser::parseDirectiveCVDefRange() {
  SMLoc Loc;
  std::vector<std::pair<const MCSymbol *, const MCSymbol *>> Ranges;
  while (getLexer().is(AsmToken::Identifier)) {
    Loc = getLexer().getLoc();
    StringRef GapStartName;
    if (parseIdentifier(GapStartName))
      return Error(Loc, "expected identifier in directive");
    MCSymbol *GapStartSym = getContext().getOrCreateSymbol(GapStartName);
 
    Loc = getLexer().getLoc();
    StringRef GapEndName;
    if (parseIdentifier(GapEndName))
      return Error(Loc, "expected identifier in directive");
    MCSymbol *GapEndSym = getContext().getOrCreateSymbol(GapEndName);
 
    Ranges.push_back({GapStartSym, GapEndSym});
  }
 
  StringRef CVDefRangeTypeStr;
  if (parseToken(
          AsmToken::Comma,
          "expected comma before def_range type in .cv_def_range directive") ||
      parseIdentifier(CVDefRangeTypeStr))
    return Error(Loc, "expected def_range type in directive");
 
  StringMap<CVDefRangeType>::const_iterator CVTypeIt =
      CVDefRangeTypeMap.find(CVDefRangeTypeStr);
  CVDefRangeType CVDRType = (CVTypeIt == CVDefRangeTypeMap.end())
                                ? CVDR_DEFRANGE
                                : CVTypeIt->getValue();
  switch (CVDRType) {
  case CVDR_DEFRANGE_REGISTER: {
    int64_t DRRegister;
    if (parseToken(AsmToken::Comma, "expected comma before register number in "
                                    ".cv_def_range directive") ||
        parseAbsoluteExpression(DRRegister))
      return Error(Loc, "expected register number");
 
    codeview::DefRangeRegisterHeader DRHdr;
    DRHdr.Register = DRRegister;
    DRHdr.MayHaveNoName = 0;
    getStreamer().emitCVDefRangeDirective(Ranges, DRHdr);
    break;
  }
  case CVDR_DEFRANGE_FRAMEPOINTER_REL: {
    int64_t DROffset;
    if (parseToken(AsmToken::Comma,
                   "expected comma before offset in .cv_def_range directive") ||
        parseAbsoluteExpression(DROffset))
      return Error(Loc, "expected offset value");
 
    codeview::DefRangeFramePointerRelHeader DRHdr;
    DRHdr.Offset = DROffset;
    getStreamer().emitCVDefRangeDirective(Ranges, DRHdr);
    break;
  }
  case CVDR_DEFRANGE_SUBFIELD_REGISTER: {
    int64_t DRRegister;
    int64_t DROffsetInParent;
    if (parseToken(AsmToken::Comma, "expected comma before register number in "
                                    ".cv_def_range directive") ||
        parseAbsoluteExpression(DRRegister))
      return Error(Loc, "expected register number");
    if (parseToken(AsmToken::Comma,
                   "expected comma before offset in .cv_def_range directive") ||
        parseAbsoluteExpression(DROffsetInParent))
      return Error(Loc, "expected offset value");
 
    codeview::DefRangeSubfieldRegisterHeader DRHdr;
    DRHdr.Register = DRRegister;
    DRHdr.MayHaveNoName = 0;
    DRHdr.OffsetInParent = DROffsetInParent;
    getStreamer().emitCVDefRangeDirective(Ranges, DRHdr);
    break;
  }
  case CVDR_DEFRANGE_REGISTER_REL: {
    int64_t DRRegister;
    int64_t DRFlags;
    int64_t DRBasePointerOffset;
    if (parseToken(AsmToken::Comma, "expected comma before register number in "
                                    ".cv_def_range directive") ||
        parseAbsoluteExpression(DRRegister))
      return Error(Loc, "expected register value");
    if (parseToken(
            AsmToken::Comma,
            "expected comma before flag value in .cv_def_range directive") ||
        parseAbsoluteExpression(DRFlags))
      return Error(Loc, "expected flag value");
    if (parseToken(AsmToken::Comma, "expected comma before base pointer offset "
                                    "in .cv_def_range directive") ||
        parseAbsoluteExpression(DRBasePointerOffset))
      return Error(Loc, "expected base pointer offset value");
 
    codeview::DefRangeRegisterRelHeader DRHdr;
    DRHdr.Register = DRRegister;
    DRHdr.Flags = DRFlags;
    DRHdr.BasePointerOffset = DRBasePointerOffset;
    getStreamer().emitCVDefRangeDirective(Ranges, DRHdr);
    break;
  }
  default:
    return Error(Loc, "unexpected def_range type in .cv_def_range directive");
  }
  return true;
}
 
/// parseDirectiveCVString
/// ::= .cv_stringtable "string"
bool MasmParser::parseDirectiveCVString() {
  std::string Data;
  if (checkForValidSection() || parseEscapedString(Data))
    return addErrorSuffix(" in '.cv_string' directive");
 
  // Put the string in the table and emit the offset.
  std::pair<StringRef, unsigned> Insertion =
      getCVContext().addToStringTable(Data);
  getStreamer().emitIntValue(Insertion.second, 4);
  return false;
}
 
/// parseDirectiveCVStringTable
/// ::= .cv_stringtable
bool MasmParser::parseDirectiveCVStringTable() {
  getStreamer().emitCVStringTableDirective();
  return false;
}
 
/// parseDirectiveCVFileChecksums
/// ::= .cv_filechecksums
bool MasmParser::parseDirectiveCVFileChecksums() {
  getStreamer().emitCVFileChecksumsDirective();
  return false;
}
 
/// parseDirectiveCVFileChecksumOffset
/// ::= .cv_filechecksumoffset fileno
bool MasmParser::parseDirectiveCVFileChecksumOffset() {
  int64_t FileNo;
  if (parseIntToken(FileNo, "expected identifier in directive"))
    return true;
  if (parseEOL())
    return true;
  getStreamer().emitCVFileChecksumOffsetDirective(FileNo);
  return false;
}
 
/// parseDirectiveCVFPOData
/// ::= .cv_fpo_data procsym
bool MasmParser::parseDirectiveCVFPOData() {
  SMLoc DirLoc = getLexer().getLoc();
  StringRef ProcName;
  if (parseIdentifier(ProcName))
    return TokError("expected symbol name");
  if (parseEOL("unexpected tokens"))
    return addErrorSuffix(" in '.cv_fpo_data' directive");
  MCSymbol *ProcSym = getContext().getOrCreateSymbol(ProcName);
  getStreamer().emitCVFPOData(ProcSym, DirLoc);
  return false;
}
 
/// parseDirectiveCFISections
/// ::= .cfi_sections section [, section]
bool MasmParser::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();