/usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/MC/MCParser/AsmParser.cpp

Bug Summary

File:	src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/MC/MCParser/AsmParser.cpp
Warning:	line 5889, column 3 1st function call argument is an uninitialized value

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name AsmParser.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model static -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/gnu/usr.bin/clang/libLLVM/obj -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Analysis -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/ASMParser -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/BinaryFormat -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Bitcode -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Bitcode -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Bitstream -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /include/llvm/CodeGen -I /include/llvm/CodeGen/PBQP -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/IR -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/IR -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms/Coroutines -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/ProfileData/Coverage -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/DebugInfo/CodeView -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/DebugInfo/DWARF -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/DebugInfo -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/DebugInfo/MSF -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/DebugInfo/PDB -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Demangle -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/ExecutionEngine -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/ExecutionEngine/JITLink -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/ExecutionEngine/Orc -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Frontend -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Frontend/OpenACC -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Frontend -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Frontend/OpenMP -I /include/llvm/CodeGen/GlobalISel -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/IRReader -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms/InstCombine -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/Transforms/InstCombine -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/LTO -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Linker -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/MC -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/MC/MCParser -I /include/llvm/CodeGen/MIRParser -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Object -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Option -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Passes -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/ -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/ProfileData -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms/Scalar -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/ADT -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Support -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/DebugInfo/Symbolize -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Target -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms/Utils -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms/Vectorize -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms/IPO -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include -I /usr/src/gnu/usr.bin/clang/libLLVM/../include -I /usr/src/gnu/usr.bin/clang/libLLVM/obj -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include -D NDEBUG -D __STDC_LIMIT_MACROS -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D LLVM_PREFIX="/usr" -internal-isystem /usr/include/c++/v1 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/usr/src/gnu/usr.bin/clang/libLLVM/obj -ferror-limit 19 -fvisibility-inlines-hidden -fwrapv -stack-protector 2 -fno-rtti -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c++ /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/MC/MCParser/AsmParser.cpp

/usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/MC/MCParser/AsmParser.cpp

→

1//===- AsmParser.cpp - Parser for Assembly Files --------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This class implements a parser for assembly files similar to gas syntax.
10//
11//===----------------------------------------------------------------------===//

13#include "llvm/ADT/APFloat.h"
14#include "llvm/ADT/APInt.h"
15#include "llvm/ADT/ArrayRef.h"
16#include "llvm/ADT/None.h"
17#include "llvm/ADT/STLExtras.h"
18#include "llvm/ADT/SmallSet.h"
19#include "llvm/ADT/SmallString.h"
20#include "llvm/ADT/SmallVector.h"
21#include "llvm/ADT/StringExtras.h"
22#include "llvm/ADT/StringMap.h"
23#include "llvm/ADT/StringRef.h"
24#include "llvm/ADT/Twine.h"
25#include "llvm/BinaryFormat/Dwarf.h"
26#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
27#include "llvm/MC/MCAsmInfo.h"
28#include "llvm/MC/MCCodeView.h"
29#include "llvm/MC/MCContext.h"
30#include "llvm/MC/MCDirectives.h"
31#include "llvm/MC/MCDwarf.h"
32#include "llvm/MC/MCExpr.h"
33#include "llvm/MC/MCInstPrinter.h"
34#include "llvm/MC/MCInstrDesc.h"
35#include "llvm/MC/MCInstrInfo.h"
36#include "llvm/MC/MCObjectFileInfo.h"
37#include "llvm/MC/MCParser/AsmCond.h"
38#include "llvm/MC/MCParser/AsmLexer.h"
39#include "llvm/MC/MCParser/MCAsmLexer.h"
40#include "llvm/MC/MCParser/MCAsmParser.h"
41#include "llvm/MC/MCParser/MCAsmParserExtension.h"
42#include "llvm/MC/MCParser/MCAsmParserUtils.h"
43#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
44#include "llvm/MC/MCParser/MCTargetAsmParser.h"
45#include "llvm/MC/MCRegisterInfo.h"
46#include "llvm/MC/MCSection.h"
47#include "llvm/MC/MCStreamer.h"
48#include "llvm/MC/MCSymbol.h"
49#include "llvm/MC/MCTargetOptions.h"
50#include "llvm/MC/MCValue.h"
51#include "llvm/Support/Casting.h"
52#include "llvm/Support/CommandLine.h"
53#include "llvm/Support/ErrorHandling.h"
54#include "llvm/Support/MD5.h"
55#include "llvm/Support/MathExtras.h"
56#include "llvm/Support/MemoryBuffer.h"
57#include "llvm/Support/SMLoc.h"
58#include "llvm/Support/SourceMgr.h"
59#include "llvm/Support/raw_ostream.h"
60#include <algorithm>
61#include <cassert>
62#include <cctype>
63#include <climits>
64#include <cstddef>
65#include <cstdint>
66#include <deque>
67#include <memory>
68#include <sstream>
69#include <string>
70#include <tuple>
71#include <utility>
72#include <vector>

74using namespace llvm;

76MCAsmParserSemaCallback::~MCAsmParserSemaCallback() = default;

78extern cl::opt<unsigned> AsmMacroMaxNestingDepth;

80namespace {

82/// Helper types for tracking macro definitions.
83typedef std::vector<AsmToken> MCAsmMacroArgument;
84typedef std::vector<MCAsmMacroArgument> MCAsmMacroArguments;

86/// Helper class for storing information about an active macro
87/// instantiation.
88struct 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;
100};

102struct 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;

SmallVectorImpl<AsmRewrite> *AsmRewrites = nullptr;

ParseStatementInfo() = delete;
ParseStatementInfo(SmallVectorImpl<AsmRewrite> *rewrites)
  : AsmRewrites(rewrites) {}
117};

119/// The concrete assembly parser instance.
120class AsmParser : public MCAsmParser {
121private:
AsmLexer Lexer;
MCContext &Ctx;
MCStreamer &Out;
const MCAsmInfo &MAI;
SourceMgr &SrcMgr;
SourceMgr::DiagHandlerTy SavedDiagHandler;
void *SavedDiagContext;
std::unique_ptr<MCAsmParserExtension> PlatformParser;
SMLoc StartTokLoc;

/// This is the current buffer index we're lexing from as managed by the
/// SourceMgr object.
unsigned CurBuffer;

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;

/// Stack of active macro instantiations.
std::vector<MacroInstantiation*> ActiveMacros;

/// List of bodies of anonymous macros.
std::deque<MCAsmMacro> MacroLikeBodies;

/// Boolean tracking whether macro substitution is enabled.
unsigned MacrosEnabledFlag : 1;

/// 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() : Filename(), LineNumber(0), Loc(), 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;

SmallSet<StringRef, 2> LTODiscardSymbols;

/// AssemblerDialect. ~OU means unset value and use value provided by MAI.
unsigned AssemblerDialect = ~0U;

/// 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;

// Is alt macro mode enabled.
bool AltMacroMode = false;

189protected:
virtual bool parseStatement(ParseStatementInfo &Info,
                            MCAsmParserSemaCallback *SI);

/// This routine uses the target specific ParseInstruction function to
/// parse an instruction into Operands, and then call the target specific
/// MatchAndEmit function to match and emit the instruction.
bool parseAndMatchAndEmitTargetInstruction(ParseStatementInfo &Info,
                                           StringRef IDVal, AsmToken ID,
                                           SMLoc IDLoc);

/// 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();

205public:
AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
          const MCAsmInfo &MAI, unsigned CB);
AsmParser(const AsmParser &) = delete;
AsmParser &operator=(const AsmParser &) = delete;
~AsmParser() override;

bool Run(bool NoInitialTextSection, bool NoFinalize = false) override;

void addDirectiveHandler(StringRef Directive,
                         ExtensionDirectiveHandler Handler) override {
  ExtensionDirectiveMap[Directive] = Handler;
}

void addAliasForDirective(StringRef Directive, StringRef Alias) override {
  DirectiveKindMap[Directive.lower()] = DirectiveKindMap[Alias.lower()];
}

/// @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 = None) override;
bool Warning(SMLoc L, const Twine &Msg, SMRange Range = None) override;
bool printError(SMLoc L, const Twine &Msg, SMRange Range = None) override;

const AsmToken &Lex() override;

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 discardLTOSymbol(StringRef Name) const override {
  return LTODiscardSymbols.contains(Name);
}

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, const MCInstPrinter *IP,
                      MCAsmParserSemaCallback &SI) override;

bool parseExpression(const MCExpr *&Res);
bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc) override;
bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc,
                      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.
bool parseIdentifier(StringRef &Res) override;
void eatToEndOfStatement() override;

bool checkForValidSection() override;

/// }

291private:
bool parseCurlyBlockScope(SmallVectorImpl<AsmRewrite>& AsmStrRewrites);
bool parseCppHashLineFilenameComment(SMLoc L, bool SaveLocInfo = true);

void checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, StringRef Body,
                      ArrayRef<MCAsmMacroParameter> Parameters);
bool expandMacro(raw_svector_ostream &OS, StringRef Body,
                 ArrayRef<MCAsmMacroParameter> Parameters,
                 ArrayRef<MCAsmMacroArgument> A, bool EnableAtPseudoVariable,
                 SMLoc L);

/// Are macros enabled in the parser?
bool areMacrosEnabled() {return MacrosEnabledFlag;}

/// Control a flag in the parser that enables or disables macros.
void setMacrosEnabled(bool Flag) {MacrosEnabledFlag = Flag;}

/// 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);

/// Handle exit from macro instantiation.
void handleMacroExit();

/// Extract AsmTokens for a macro argument.
bool parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg);

/// Parse all macro arguments for a given macro.
bool parseMacroArguments(const MCAsmMacro *M, MCAsmMacroArguments &A);

void printMacroInstantiations();
void printMessage(SMLoc Loc, SourceMgr::DiagKind Kind, const Twine &Msg,
                  SMRange Range = None) const {
  ArrayRef<SMRange> Ranges(Range);
  SrcMgr.PrintMessage(Loc, Kind, Msg, Ranges);
}
static void DiagHandler(const SMDiagnostic &Diag, void *Context);

/// Enter the specified file. This returns true on failure.
bool enterIncludeFile(const std::string &Filename);

/// Process the specified file for the .incbin directive.
/// This returns true on failure.
bool processIncbinFile(const std::string &Filename, int64_t Skip = 0,
                       const MCExpr *Count = nullptr, SMLoc Loc = SMLoc());

/// 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);

/// Parse up to the end of statement and a return the contents from the
/// current token until the end of the statement; the current token on exit
/// will be either the EndOfStatement or EOF.
StringRef parseStringToEndOfStatement() override;

/// Parse until the end of a statement or a comma is encountered,
/// return the contents from the current token up to the end or comma.
StringRef parseStringToComma();

bool parseAssignment(StringRef Name, bool allow_redef,
                     bool NoDeadStrip = false);

unsigned getBinOpPrecedence(AsmToken::TokenKind K,
                            MCBinaryExpr::Opcode &Kind);

bool parseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc);
bool parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc);
bool parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc);

bool parseRegisterOrRegisterNumber(int64_t &Register, SMLoc DirectiveLoc);

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_SET,
  DK_EQU,
  DK_EQUIV,
  DK_ASCII,
  DK_ASCIZ,
  DK_STRING,
  DK_BYTE,
  DK_SHORT,
  DK_RELOC,
  DK_VALUE,
  DK_2BYTE,
  DK_LONG,
  DK_INT,
  DK_4BYTE,
  DK_QUAD,
  DK_8BYTE,
  DK_OCTA,
  DK_DC,
  DK_DC_A,
  DK_DC_B,
  DK_DC_D,
  DK_DC_L,
  DK_DC_S,
  DK_DC_W,
  DK_DC_X,
  DK_DCB,
  DK_DCB_B,
  DK_DCB_D,
  DK_DCB_L,
  DK_DCB_S,
  DK_DCB_W,
  DK_DCB_X,
  DK_DS,
  DK_DS_B,
  DK_DS_D,
  DK_DS_L,
  DK_DS_P,
  DK_DS_S,
  DK_DS_W,
  DK_DS_X,
  DK_SINGLE,
  DK_FLOAT,
  DK_DOUBLE,
  DK_ALIGN,
  DK_ALIGN32,
  DK_BALIGN,
  DK_BALIGNW,
  DK_BALIGNL,
  DK_P2ALIGN,
  DK_P2ALIGNW,
  DK_P2ALIGNL,
  DK_ORG,
  DK_FILL,
  DK_ENDR,
  DK_BUNDLE_ALIGN_MODE,
  DK_BUNDLE_LOCK,
  DK_BUNDLE_UNLOCK,
  DK_ZERO,
  DK_EXTERN,
  DK_GLOBL,
  DK_GLOBAL,
  DK_LAZY_REFERENCE,
  DK_NO_DEAD_STRIP,
  DK_SYMBOL_RESOLVER,
  DK_PRIVATE_EXTERN,
  DK_REFERENCE,
  DK_WEAK_DEFINITION,
  DK_WEAK_REFERENCE,
  DK_WEAK_DEF_CAN_BE_HIDDEN,
  DK_COLD,
  DK_COMM,
  DK_COMMON,
  DK_LCOMM,
  DK_ABORT,
  DK_INCLUDE,
  DK_INCBIN,
  DK_CODE16,
  DK_CODE16GCC,
  DK_REPT,
  DK_IRP,
  DK_IRPC,
  DK_IF,
  DK_IFEQ,
  DK_IFGE,
  DK_IFGT,
  DK_IFLE,
  DK_IFLT,
  DK_IFNE,
  DK_IFB,
  DK_IFNB,
  DK_IFC,
  DK_IFEQS,
  DK_IFNC,
  DK_IFNES,
  DK_IFDEF,
  DK_IFNDEF,
  DK_IFNOTDEF,
  DK_ELSEIF,
  DK_ELSE,
  DK_ENDIF,
  DK_SPACE,
  DK_SKIP,
  DK_FILE,
  DK_LINE,
  DK_LOC,
  DK_STABS,
  DK_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_LLVM_DEF_ASPACE_CFA,
  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_MACROS_ON,
  DK_MACROS_OFF,
  DK_ALTMACRO,
  DK_NOALTMACRO,
  DK_MACRO,
  DK_EXITM,
  DK_ENDM,
  DK_ENDMACRO,
  DK_PURGEM,
  DK_SLEB128,
  DK_ULEB128,
  DK_ERR,
  DK_ERROR,
  DK_WARNING,
  DK_PRINT,
  DK_ADDRSIG,
  DK_ADDRSIG_SYM,
  DK_PSEUDO_PROBE,
  DK_LTO_DISCARD,
  DK_END
};

/// Maps directive name --> DirectiveKind enum, for
/// directives parsed by this class.
StringMap<DirectiveKind> DirectiveKindMap;

// 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;

// ".ascii", ".asciz", ".string"
bool parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated);
bool parseDirectiveReloc(SMLoc DirectiveLoc); // ".reloc"
bool parseDirectiveValue(StringRef IDVal,
                         unsigned Size);       // ".byte", ".long", ...
bool parseDirectiveOctaValue(StringRef IDVal); // ".octa", ...
bool parseDirectiveRealValue(StringRef IDVal,
                             const fltSemantics &); // ".single", ...
bool parseDirectiveFill(); // ".fill"
bool parseDirectiveZero(); // ".zero"
// ".set", ".equ", ".equiv"
bool parseDirectiveSet(StringRef IDVal, bool allow_redef);
bool parseDirectiveOrg(); // ".org"
// ".align{,32}", ".p2align{,w,l}"
bool parseDirectiveAlign(bool IsPow2, unsigned ValueSize);

// ".file", ".line", ".loc", ".stabs"
bool parseDirectiveFile(SMLoc DirectiveLoc);
bool parseDirectiveLine();
bool parseDirectiveLoc();
bool parseDirectiveStabs();

// ".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();
bool parseDirectiveCFISections();
bool parseDirectiveCFIStartProc();
bool parseDirectiveCFIEndProc();
bool parseDirectiveCFIDefCfaOffset();
bool parseDirectiveCFIDefCfa(SMLoc DirectiveLoc);
bool parseDirectiveCFIAdjustCfaOffset();
bool parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc);
bool parseDirectiveCFILLVMDefAspaceCfa(SMLoc DirectiveLoc);
bool parseDirectiveCFIOffset(SMLoc DirectiveLoc);
bool parseDirectiveCFIRelOffset(SMLoc DirectiveLoc);
bool parseDirectiveCFIPersonalityOrLsda(bool IsPersonality);
bool parseDirectiveCFIRememberState();
bool parseDirectiveCFIRestoreState();
bool parseDirectiveCFISameValue(SMLoc DirectiveLoc);
bool parseDirectiveCFIRestore(SMLoc DirectiveLoc);
bool parseDirectiveCFIEscape();
bool parseDirectiveCFIReturnColumn(SMLoc DirectiveLoc);
bool parseDirectiveCFISignalFrame();
bool parseDirectiveCFIUndefined(SMLoc DirectiveLoc);

// macro directives
bool parseDirectivePurgeMacro(SMLoc DirectiveLoc);
bool parseDirectiveExitMacro(StringRef Directive);
bool parseDirectiveEndMacro(StringRef Directive);
bool parseDirectiveMacro(SMLoc DirectiveLoc);
bool parseDirectiveMacrosOnOff(StringRef Directive);
// alternate macro mode directives
bool parseDirectiveAltmacro(StringRef Directive);
// ".bundle_align_mode"
bool parseDirectiveBundleAlignMode();
// ".bundle_lock"
bool parseDirectiveBundleLock();
// ".bundle_unlock"
bool parseDirectiveBundleUnlock();

// ".space", ".skip"
bool parseDirectiveSpace(StringRef IDVal);

// ".dcb"
bool parseDirectiveDCB(StringRef IDVal, unsigned Size);
bool parseDirectiveRealDCB(StringRef IDVal, const fltSemantics &);
// ".ds"
bool parseDirectiveDS(StringRef IDVal, unsigned Size);

// .sleb128 (Signed=true) and .uleb128 (Signed=false)
bool parseDirectiveLEB128(bool Signed);

/// Parse a directive like ".globl" which
/// accepts a single symbol (which should be a label or an external).
bool parseDirectiveSymbolAttribute(MCSymbolAttr Attr);

bool parseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm"

bool parseDirectiveAbort(); // ".abort"
bool parseDirectiveInclude(); // ".include"
bool parseDirectiveIncbin(); // ".incbin"

// ".if", ".ifeq", ".ifge", ".ifgt" , ".ifle", ".iflt" or ".ifne"
bool parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind);
// ".ifb" or ".ifnb", depending on ExpectBlank.
bool parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank);
// ".ifc" or ".ifnc", depending on ExpectEqual.
bool parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual);
// ".ifeqs" or ".ifnes", depending on ExpectEqual.
bool parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual);
// ".ifdef" or ".ifndef", depending on expect_defined
bool parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined);
bool parseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif"
bool parseDirectiveElse(SMLoc DirectiveLoc); // ".else"
bool parseDirectiveEndIf(SMLoc DirectiveLoc); // .endif
bool parseEscapedString(std::string &Data) override;
bool parseAngleBracketString(std::string &Data) override;

const MCExpr *applyModifierToExpr(const MCExpr *E,
                                  MCSymbolRefExpr::VariantKind Variant);

// Macro-like directives
MCAsmMacro *parseMacroLikeBody(SMLoc DirectiveLoc);
void instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
                              raw_svector_ostream &OS);
bool parseDirectiveRept(SMLoc DirectiveLoc, StringRef Directive);
bool parseDirectiveIrp(SMLoc DirectiveLoc);  // ".irp"
bool parseDirectiveIrpc(SMLoc DirectiveLoc); // ".irpc"
bool parseDirectiveEndr(SMLoc DirectiveLoc); // ".endr"

// "_emit" or "__emit"
bool parseDirectiveMSEmit(SMLoc DirectiveLoc, ParseStatementInfo &Info,
                          size_t Len);

// "align"
bool parseDirectiveMSAlign(SMLoc DirectiveLoc, ParseStatementInfo &Info);

// "end"
bool parseDirectiveEnd(SMLoc DirectiveLoc);

// ".err" or ".error"
bool parseDirectiveError(SMLoc DirectiveLoc, bool WithMessage);

// ".warning"
bool parseDirectiveWarning(SMLoc DirectiveLoc);

// .print <double-quotes-string>
bool parseDirectivePrint(SMLoc DirectiveLoc);

// .pseudoprobe
bool parseDirectivePseudoProbe();

// ".lto_discard"
bool parseDirectiveLTODiscard();

// Directives to support address-significance tables.
bool parseDirectiveAddrsig();
bool parseDirectiveAddrsigSym();

void initializeDirectiveKindMap();
void initializeCVDefRangeTypeMap();
713};

715class HLASMAsmParser final : public AsmParser {
716private:
MCAsmLexer &Lexer;
MCStreamer &Out;

void lexLeadingSpaces() {
  while (Lexer.is(AsmToken::Space))
    Lexer.Lex();
}

bool parseAsHLASMLabel(ParseStatementInfo &Info, MCAsmParserSemaCallback *SI);
bool parseAsMachineInstruction(ParseStatementInfo &Info,
                               MCAsmParserSemaCallback *SI);

729public:
HLASMAsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
               const MCAsmInfo &MAI, unsigned CB = 0)
    : AsmParser(SM, Ctx, Out, MAI, CB), Lexer(getLexer()), Out(Out) {
  Lexer.setSkipSpace(false);
  Lexer.setAllowHashInIdentifier(true);
  Lexer.setLexHLASMIntegers(true);
  Lexer.setLexHLASMStrings(true);
}

~HLASMAsmParser() { Lexer.setSkipSpace(true); }

bool parseStatement(ParseStatementInfo &Info,
                    MCAsmParserSemaCallback *SI) override;
743};

745} // end anonymous namespace

747namespace llvm {

749extern MCAsmParserExtension *createDarwinAsmParser();
750extern MCAsmParserExtension *createELFAsmParser();
751extern MCAsmParserExtension *createCOFFAsmParser();
752extern MCAsmParserExtension *createXCOFFAsmParser();
753extern MCAsmParserExtension *createWasmAsmParser();

755} // end namespace llvm

757enum { DEFAULT_ADDRSPACE = 0 };

759AsmParser::AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
                   const MCAsmInfo &MAI, unsigned CB = 0)
  : Lexer(MAI), Ctx(Ctx), Out(Out), MAI(MAI), SrcMgr(SM),
    CurBuffer(CB ? CB : SM.getMainFileID()), MacrosEnabledFlag(true) {
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());
// Make MCStreamer aware of the StartTokLoc for locations in diagnostics.
Out.setStartTokLocPtr(&StartTokLoc);

// Initialize the platform / file format parser.
switch (Ctx.getObjectFileType()) {
case MCContext::IsCOFF:
  PlatformParser.reset(createCOFFAsmParser());
  break;
case MCContext::IsMachO:
  PlatformParser.reset(createDarwinAsmParser());
  IsDarwin = true;
  break;
case MCContext::IsELF:
  PlatformParser.reset(createELFAsmParser());
  break;
case MCContext::IsGOFF:
  report_fatal_error("GOFFAsmParser support not implemented yet");
case MCContext::IsWasm:
  PlatformParser.reset(createWasmAsmParser());
  break;
case MCContext::IsXCOFF:
  PlatformParser.reset(createXCOFFAsmParser());
  break;
}

PlatformParser->Initialize(*this);
initializeDirectiveKindMap();
initializeCVDefRangeTypeMap();

NumOfMacroInstantiations = 0;
800}

802AsmParser::~AsmParser() {
assert((HadError || ActiveMacros.empty()) &&((void)0)
       "Unexpected active macro instantiation!")((void)0);

// Remove MCStreamer's reference to the parser SMLoc.
Out.setStartTokLocPtr(nullptr);
// Restore the saved diagnostics handler and context for use during
// finalization.
SrcMgr.setDiagHandler(SavedDiagHandler, SavedDiagContext);
811}

813void AsmParser::printMacroInstantiations() {
// Print the active macro instantiation stack.
for (std::vector<MacroInstantiation *>::const_reverse_iterator
         it = ActiveMacros.rbegin(),
         ie = ActiveMacros.rend();
     it != ie; ++it)
  printMessage((*it)->InstantiationLoc, SourceMgr::DK_Note,
               "while in macro instantiation");
821}

823void AsmParser::Note(SMLoc L, const Twine &Msg, SMRange Range) {
printPendingErrors();
printMessage(L, SourceMgr::DK_Note, Msg, Range);
printMacroInstantiations();
827}

829bool AsmParser::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;
837}

839bool AsmParser::printError(SMLoc L, const Twine &Msg, SMRange Range) {
HadError = true;
printMessage(L, SourceMgr::DK_Error, Msg, Range);
printMacroInstantiations();
return true;
844}

846bool AsmParser::enterIncludeFile(const std::string &Filename) {
std::string IncludedFile;
unsigned NewBuf =
    SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile);
if (!NewBuf)
  return true;

CurBuffer = NewBuf;
Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
return false;
856}

858/// Process the specified .incbin file by searching for it in the include paths
859/// then just emitting the byte contents of the file to the streamer. This
860/// returns true on failure.
861bool AsmParser::processIncbinFile(const std::string &Filename, int64_t Skip,
                                const MCExpr *Count, SMLoc Loc) {
std::string IncludedFile;
unsigned NewBuf =
    SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile);
if (!NewBuf)
  return true;

// Pick up the bytes from the file and emit them.
StringRef Bytes = SrcMgr.getMemoryBuffer(NewBuf)->getBuffer();
Bytes = Bytes.drop_front(Skip);
if (Count) {
  int64_t Res;
  if (!Count->evaluateAsAbsolute(Res, getStreamer().getAssemblerPtr()))
    return Error(Loc, "expected absolute expression");
  if (Res < 0)
    return Warning(Loc, "negative count has no effect");
  Bytes = Bytes.take_front(Res);
}
getStreamer().emitBytes(Bytes);
return false;
882}

884void AsmParser::jumpToLoc(SMLoc Loc, unsigned InBuffer) {
CurBuffer = InBuffer ? InBuffer : SrcMgr.FindBufferContainingLoc(Loc);
Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer(),
                Loc.getPointer());
888}

890const AsmToken &AsmParser::Lex() {
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();

// 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();
}

if (tok->is(AsmToken::Eof)) {
  // If this is the end of an included file, pop the parent file off the
  // include stack.
  SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
  if (ParentIncludeLoc != SMLoc()) {
    jumpToLoc(ParentIncludeLoc);
    return Lex();
  }
}

return *tok;
922}

924bool AsmParser::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=*/None, /*Source=*/None);
  const MCDwarfFile &RootFile =
      getContext().getMCDwarfLineTable(/*CUID=*/0).getRootFile();
  getContext().setGenDwarfFileNumber(getStreamer().emitDwarfFileDirective(
      /*CUID=*/0, getContext().getCompilationDir(), RootFile.Name,
      RootFile.Checksum, RootFile.Source));
}
return true;
946}

948bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
LTODiscardSymbols.clear();

// Create the initial section, if requested.
if (!NoInitialTextSection)
  Out.InitSections(false);

// 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)0);
  (void)InsertResult;
}

StringRef Filename = getContext().getMainFileName();
if (!Filename.empty() && (Filename.compare(StringRef("-")) != 0))
  Out.emitFileDirective(Filename);

getTargetParser().onBeginOfFile();

// While we have input, parse each statement.
while (Lexer.isNot(AsmToken::Eof)) {
  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")((void)0);

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 necessarilly have seen everything yet.
if (!NoFinalize) {
  if (MAI.hasSubsectionsViaSymbols()) {
    for (const auto &TableEntry : getContext().getSymbols()) {
      MCSymbol *Sym = TableEntry.getValue();
      // Variable symbols may not be marked as defined, so check those
      // explicitly. If we know it's a variable, we have a definition for
      // the purposes of this check.
      if (Sym->isTemporary() && !Sym->isVariable() && !Sym->isDefined())
        // FIXME: We would really like to refer back to where the symbol was
        // first referenced for a source location. We need to add something
        // to track that. Currently, we just point to the end of the file.
        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();
1066}

1068bool AsmParser::checkForValidSection() {
if (!ParsingMSInlineAsm && !getStreamer().getCurrentSectionOnly()) {
  Out.InitSections(false);
  return Error(getTok().getLoc(),
               "expected section directive before assembly directive");
}
return false;
1075}

1077/// Throw away the rest of the line for testing purposes.
1078void AsmParser::eatToEndOfStatement() {
while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof))
  Lexer.Lex();

// Eat EOL.
if (Lexer.is(AsmToken::EndOfStatement))
  Lexer.Lex();
1085}

1087StringRef AsmParser::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);
1095}

1097StringRef AsmParser::parseStringToComma() {
const char *Start = getTok().getLoc().getPointer();

while (Lexer.isNot(AsmToken::EndOfStatement) &&
       Lexer.isNot(AsmToken::Comma) && Lexer.isNot(AsmToken::Eof))
  Lexer.Lex();

const char *End = getTok().getLoc().getPointer();
return StringRef(Start, End - Start);
1106}

1108/// Parse a paren expression and return it.
1109/// NOTE: This assumes the leading '(' has already been consumed.
1110///
1111/// parenexpr ::= expr)
1112///
1113bool AsmParser::parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) {
if (parseExpression(Res))
  return true;
if (Lexer.isNot(AsmToken::RParen))
  return TokError("expected ')' in parentheses expression");
EndLoc = Lexer.getTok().getEndLoc();
Lex();
return false;
1121}

1123/// Parse a bracket expression and return it.
1124/// NOTE: This assumes the leading '[' has already been consumed.
1125///
1126/// bracketexpr ::= expr]
1127///
1128bool AsmParser::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;
1135}

1137/// Parse a primary expression and return it.
1138///  primaryexpr ::= (parenexpr
1139///  primaryexpr ::= symbol
1140///  primaryexpr ::= number
1141///  primaryexpr ::= '.'
1142///  primaryexpr ::= ~,+,- primaryexpr
1143bool AsmParser::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, TypeInfo))
    return true;
  Res = MCUnaryExpr::createLNot(Res, getContext(), FirstTokenLoc);
  return false;
case AsmToken::Dollar:
case AsmToken::Star:
case AsmToken::At:
case AsmToken::String:
case AsmToken::Identifier: {
  StringRef Identifier;
  if (parseIdentifier(Identifier)) {
    // We may have failed but '$'|'*' may be a valid token in context of
    // the current PC.
    if (getTok().is(AsmToken::Dollar) || getTok().is(AsmToken::Star)) {
      bool ShouldGenerateTempSymbol = false;
      if ((getTok().is(AsmToken::Dollar) && MAI.getDollarIsPC()) ||
          (getTok().is(AsmToken::Star) && MAI.getStarIsPC()))
        ShouldGenerateTempSymbol = true;

      if (!ShouldGenerateTempSymbol)
        return Error(FirstTokenLoc, "invalid token in expression");

      // Eat the '$'|'*' token.
      Lex();
      // This is either a '$'|'*' 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;
    }
  }
  // Parse symbol variant
  std::pair<StringRef, StringRef> Split;
  if (!MAI.useParensForSymbolVariant()) {
    if (FirstTokenKind == AsmToken::String) {
      if (Lexer.is(AsmToken::At)) {
        Lex(); // eat @
        SMLoc AtLoc = getLexer().getLoc();
        StringRef VName;
        if (parseIdentifier(VName))
          return Error(AtLoc, "expected symbol variant after '@'");

        Split = std::make_pair(Identifier, VName);
      }
    } else {
      Split = Identifier.split('@');
    }
  } else if (Lexer.is(AsmToken::LParen)) {
    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;

  // Lookup 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 + "'");
    }
  }

  MCSymbol *Sym = getContext().getInlineAsmLabel(SymbolName);
  if (!Sym)
    Sym = getContext().getOrCreateSymbol(
        MAI.shouldEmitLabelsInUpperCase() ? SymbolName.upper() : 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.
  Res = MCSymbolRefExpr::create(Sym, Variant, getContext(), FirstTokenLoc);
  return false;
}
case AsmToken::BigNum:
  return TokError("literal value out of range for directive");
case AsmToken::Integer: {
  SMLoc Loc = getTok().getLoc();
  int64_t IntVal = getTok().getIntVal();
  Res = MCConstantExpr::create(IntVal, getContext());
  EndLoc = Lexer.getTok().getEndLoc();
  Lex(); // Eat token.
  // Look for 'b' or 'f' following an Integer as a directional label
  if (Lexer.getKind() == AsmToken::Identifier) {
    StringRef IDVal = getTok().getString();
    // Lookup the symbol variant if used.
    std::pair<StringRef, StringRef> Split = IDVal.split('@');
    MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
    if (Split.first.size() != IDVal.size()) {
      Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
      if (Variant == MCSymbolRefExpr::VK_Invalid)
        return TokError("invalid variant '" + Split.second + "'");
      IDVal = Split.first;
    }
    if (IDVal == "f" || IDVal == "b") {
      MCSymbol *Sym =
          Ctx.getDirectionalLocalSymbol(IntVal, IDVal == "b");
      Res = MCSymbolRefExpr::create(Sym, Variant, getContext());
      if (IDVal == "b" && Sym->isUndefined())
        return Error(Loc, "directional label undefined");
      DirLabels.push_back(std::make_tuple(Loc, CppHashInfo, Sym));
      EndLoc = Lexer.getTok().getEndLoc();
      Lex(); // Eat identifier.
    }
  }
  return false;
}
case AsmToken::Real: {
  APFloat RealVal(APFloat::IEEEdouble(), getTok().getString());
  uint64_t IntVal = RealVal.bitcastToAPInt().getZExtValue();
  Res = MCConstantExpr::create(IntVal, getContext());
  EndLoc = Lexer.getTok().getEndLoc();
  Lex(); // Eat token.
  return false;
}
case AsmToken::Dot: {
  if (!MAI.getDotIsPC())
    return TokError("cannot use . as current PC");

  // 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, TypeInfo))
    return true;
  Res = MCUnaryExpr::createMinus(Res, getContext(), FirstTokenLoc);
  return false;
case AsmToken::Plus:
  Lex(); // Eat the operator.
  if (parsePrimaryExpr(Res, EndLoc, TypeInfo))
    return true;
  Res = MCUnaryExpr::createPlus(Res, getContext(), FirstTokenLoc);
  return false;
case AsmToken::Tilde:
  Lex(); // Eat the operator.
  if (parsePrimaryExpr(Res, EndLoc, TypeInfo))
    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 (Lexer.isNot(AsmToken::RParen))
    return TokError("expected ')'");
  Lex(); // Eat the operator.
  Res = getTargetParser().createTargetUnaryExpr(Res, FirstTokenKind, Ctx);
  return !Res;
}
1380}

1382bool AsmParser::parseExpression(const MCExpr *&Res) {
SMLoc EndLoc;
return parseExpression(Res, EndLoc);
1385}

1387const MCExpr *
1388AsmParser::applyModifierToExpr(const MCExpr *E,
                             MCSymbolRefExpr::VariantKind Variant) {
// Ask the target implementation about this expression first.
const MCExpr *NewE = getTargetParser().applyModifierToExpr(E, Variant, Ctx);
if (NewE)
  return NewE;
// Recurse over the given expression, rebuilding it to apply the given variant
// if there is exactly one symbol.
switch (E->getKind()) {
case MCExpr::Target:
case MCExpr::Constant:
  return nullptr;

case MCExpr::SymbolRef: {
  const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(E);

  if (SRE->getKind() != MCSymbolRefExpr::VK_None) {
    TokError("invalid variant on expression '" + getTok().getIdentifier() +
             "' (already modified)");
    return E;
  }

  return MCSymbolRefExpr::create(&SRE->getSymbol(), Variant, getContext());
}

case MCExpr::Unary: {
  const MCUnaryExpr *UE = cast<MCUnaryExpr>(E);
  const MCExpr *Sub = applyModifierToExpr(UE->getSubExpr(), Variant);
  if (!Sub)
    return nullptr;
  return MCUnaryExpr::create(UE->getOpcode(), Sub, getContext());
}

case MCExpr::Binary: {
  const MCBinaryExpr *BE = cast<MCBinaryExpr>(E);
  const MCExpr *LHS = applyModifierToExpr(BE->getLHS(), Variant);
  const MCExpr *RHS = applyModifierToExpr(BE->getRHS(), Variant);

  if (!LHS && !RHS)
    return nullptr;

  if (!LHS)
    LHS = BE->getLHS();
  if (!RHS)
    RHS = BE->getRHS();

  return MCBinaryExpr::create(BE->getOpcode(), LHS, RHS, getContext());
}
}

llvm_unreachable("Invalid expression kind!")__builtin_unreachable();
1439}

1441/// This function checks if the next token is <string> type or arithmetic.
1442/// string that begin with character '<' must end with character '>'.
1443/// otherwise it is arithmetics.
1444/// If the function returns a 'true' value,
1445/// the End argument will be filled with the last location pointed to the '>'
1446/// character.

1448/// There is a gap between the AltMacro's documentation and the single quote
1449/// implementation. GCC does not fully support this feature and so we will not
1450/// support it.
1451/// TODO: Adding single quote as a string.
1452static bool isAngleBracketString(SMLoc &StrLoc, SMLoc &EndLoc) {
assert((StrLoc.getPointer() != nullptr) &&((void)0)
       "Argument to the function cannot be a NULL value")((void)0);
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;
1467}

1469/// creating a string without the escape characters '!'.
1470static std::string angleBracketString(StringRef AltMacroStr) {
std::string Res;
for (size_t Pos = 0; Pos < AltMacroStr.size(); Pos++) {
  if (AltMacroStr[Pos] == '!')
    Pos++;
  Res += AltMacroStr[Pos];
}
return Res;
1478}

1480/// Parse an expression and return it.
1481///
1482///  expr ::= expr &&,|| expr               -> lowest.
1483///  expr ::= expr |,^,&,! expr
1484///  expr ::= expr ==,!=,<>,<,<=,>,>= expr
1485///  expr ::= expr <<,>> expr
1486///  expr ::= expr +,- expr
1487///  expr ::= expr *,/,% expr               -> highest.
1488///  expr ::= primaryexpr
1489///
1490bool AsmParser::parseExpression(const MCExpr *&Res, SMLoc &EndLoc) {
// Parse the expression.
Res = nullptr;
if (getTargetParser().parsePrimaryExpr(Res, EndLoc) ||
    parseBinOpRHS(1, Res, EndLoc))
  return true;

// As a special case, we support 'a op b @ modifier' by rewriting the
// expression to include the modifier. This is inefficient, but in general we
// expect users to use 'a@modifier op b'.
if (Lexer.getKind() == AsmToken::At) {
  Lex();

  if (Lexer.isNot(AsmToken::Identifier))
    return TokError("unexpected symbol modifier following '@'");

  MCSymbolRefExpr::VariantKind Variant =
      MCSymbolRefExpr::getVariantKindForName(getTok().getIdentifier());
  if (Variant == MCSymbolRefExpr::VK_Invalid)
    return TokError("invalid variant '" + getTok().getIdentifier() + "'");

  const MCExpr *ModifiedRes = applyModifierToExpr(Res, Variant);
  if (!ModifiedRes) {
    return TokError("invalid modifier '" + getTok().getIdentifier() +
                    "' (no symbols present)");
  }

  Res = ModifiedRes;
  Lex();
}

// Try to constant fold it up front, if possible. Do not exploit
// assembler here.
int64_t Value;
if (Res->evaluateAsAbsolute(Value))
  Res = MCConstantExpr::create(Value, getContext());

return false;
1528}

1530bool AsmParser::parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) {
Res = nullptr;
return parseParenExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc);
1533}

1535bool AsmParser::parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res,
                                    SMLoc &EndLoc) {
if (parseParenExpr(Res, EndLoc))
  return true;

for (; ParenDepth > 0; --ParenDepth) {
  if (parseBinOpRHS(1, Res, EndLoc))
    return true;

  // We don't Lex() the last RParen.
  // This is the same behavior as parseParenExpression().
  if (ParenDepth - 1 > 0) {
    EndLoc = getTok().getEndLoc();
    if (parseToken(AsmToken::RParen,
                   "expected ')' in parentheses expression"))
      return true;
  }
}
return false;
1554}

1556bool AsmParser::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;
1567}

1569static unsigned getDarwinBinOpPrecedence(AsmToken::TokenKind K,
                                       MCBinaryExpr::Opcode &Kind,
                                       bool ShouldUseLogicalShr) {
switch (K) {
default:
  return 0; // not a binop.

// Lowest Precedence: &&, ||
case AsmToken::AmpAmp:
  Kind = MCBinaryExpr::LAnd;
  return 1;
case AsmToken::PipePipe:
  Kind = MCBinaryExpr::LOr;
  return 1;

// Low Precedence: |, &, ^
case AsmToken::Pipe:
  Kind = MCBinaryExpr::Or;
  return 2;
case AsmToken::Caret:
  Kind = MCBinaryExpr::Xor;
  return 2;
case AsmToken::Amp:
  Kind = MCBinaryExpr::And;
  return 2;

// Low Intermediate Precedence: ==, !=, <>, <, <=, >, >=
case AsmToken::EqualEqual:
  Kind = MCBinaryExpr::EQ;
  return 3;
case AsmToken::ExclaimEqual:
case AsmToken::LessGreater:
  Kind = MCBinaryExpr::NE;
  return 3;
case AsmToken::Less:
  Kind = MCBinaryExpr::LT;
  return 3;
case AsmToken::LessEqual:
  Kind = MCBinaryExpr::LTE;
  return 3;
case AsmToken::Greater:
  Kind = MCBinaryExpr::GT;
  return 3;
case AsmToken::GreaterEqual:
  Kind = MCBinaryExpr::GTE;
  return 3;

// Intermediate Precedence: <<, >>
case AsmToken::LessLess:
  Kind = MCBinaryExpr::Shl;
  return 4;
case AsmToken::GreaterGreater:
  Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr;
  return 4;

// High Intermediate Precedence: +, -
case AsmToken::Plus:
  Kind = MCBinaryExpr::Add;
  return 5;
case AsmToken::Minus:
  Kind = MCBinaryExpr::Sub;
  return 5;

// Highest Precedence: *, /, %
case AsmToken::Star:
  Kind = MCBinaryExpr::Mul;
  return 6;
case AsmToken::Slash:
  Kind = MCBinaryExpr::Div;
  return 6;
case AsmToken::Percent:
  Kind = MCBinaryExpr::Mod;
  return 6;
}
1643}

1645static unsigned getGNUBinOpPrecedence(const MCAsmInfo &MAI,
                                    AsmToken::TokenKind K,
                                    MCBinaryExpr::Opcode &Kind,
                                    bool ShouldUseLogicalShr) {
switch (K) {
default:
  return 0; // not a binop.

// Lowest Precedence: &&, ||
case AsmToken::AmpAmp:
  Kind = MCBinaryExpr::LAnd;
  return 2;
case AsmToken::PipePipe:
  Kind = MCBinaryExpr::LOr;
  return 1;

// Low Precedence: ==, !=, <>, <, <=, >, >=
case AsmToken::EqualEqual:
  Kind = MCBinaryExpr::EQ;
  return 3;
case AsmToken::ExclaimEqual:
case AsmToken::LessGreater:
  Kind = MCBinaryExpr::NE;
  return 3;
case AsmToken::Less:
  Kind = MCBinaryExpr::LT;
  return 3;
case AsmToken::LessEqual:
  Kind = MCBinaryExpr::LTE;
  return 3;
case AsmToken::Greater:
  Kind = MCBinaryExpr::GT;
  return 3;
case AsmToken::GreaterEqual:
  Kind = MCBinaryExpr::GTE;
  return 3;

// Low Intermediate Precedence: +, -
case AsmToken::Plus:
  Kind = MCBinaryExpr::Add;
  return 4;
case AsmToken::Minus:
  Kind = MCBinaryExpr::Sub;
  return 4;

// High Intermediate Precedence: |, !, &, ^
//
case AsmToken::Pipe:
  Kind = MCBinaryExpr::Or;
  return 5;
case AsmToken::Exclaim:
  // Hack to support ARM compatible aliases (implied 'sp' operand in 'srs*'
  // instructions like 'srsda #31!') and not parse ! as an infix operator.
  if (MAI.getCommentString() == "@")
    return 0;
  Kind = MCBinaryExpr::OrNot;
  return 5;
case AsmToken::Caret:
  Kind = MCBinaryExpr::Xor;
  return 5;
case AsmToken::Amp:
  Kind = MCBinaryExpr::And;
  return 5;

// Highest Precedence: *, /, %, <<, >>
case AsmToken::Star:
  Kind = MCBinaryExpr::Mul;
  return 6;
case AsmToken::Slash:
  Kind = MCBinaryExpr::Div;
  return 6;
case AsmToken::Percent:
  Kind = MCBinaryExpr::Mod;
  return 6;
case AsmToken::LessLess:
  Kind = MCBinaryExpr::Shl;
  return 6;
case AsmToken::GreaterGreater:
  Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr;
  return 6;
}
1726}

1728unsigned AsmParser::getBinOpPrecedence(AsmToken::TokenKind K,
                                     MCBinaryExpr::Opcode &Kind) {
bool ShouldUseLogicalShr = MAI.shouldUseLogicalShr();
return IsDarwin ? getDarwinBinOpPrecedence(K, Kind, ShouldUseLogicalShr)
                : getGNUBinOpPrecedence(MAI, K, Kind, ShouldUseLogicalShr);
1733}

1735/// Parse all binary operators with precedence >= 'Precedence'.
1736/// Res contains the LHS of the expression on input.
1737bool AsmParser::parseBinOpRHS(unsigned Precedence, const MCExpr *&Res,
                            SMLoc &EndLoc) {
SMLoc StartLoc = Lexer.getLoc();
while (true) {
  MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
  unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);

  // If the next token is lower precedence than we are allowed to eat, return
  // successfully with what we ate already.
  if (TokPrec < Precedence)
    return false;

  Lex();

  // Eat the next primary expression.
  const MCExpr *RHS;
  if (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);
}
1766}

1768/// ParseStatement:
1769///   ::= EndOfStatement
1770///   ::= Label* Directive ...Operands... EndOfStatement
1771///   ::= Label* Identifier OperandList* EndOfStatement
1772bool AsmParser::parseStatement(ParseStatementInfo &Info,
                             MCAsmParserSemaCallback *SI) {
assert(!hasPendingError() && "parseStatement started with pending error")((void)0);
// Eat initial spaces and comments
while (Lexer.is(AsmToken::Space))
1
Loop condition is false. Execution continues on line 1778→
  Lex();
if (Lexer.is(AsmToken::EndOfStatement)) {
2
←
Taking false branch→
  // 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;
}
// Statements always start with an identifier.
AsmToken ID = getTok();
SMLoc IDLoc = ID.getLoc();
StringRef IDVal;
int64_t LocalLabelVal = -1;
StartTokLoc = ID.getLoc();
if (Lexer.is(AsmToken::HashDirective))
3
←
Taking false branch→
  return parseCppHashLineFilenameComment(IDLoc,
                                         !isInsideMacroInstantiation());

// Allow an integer followed by a ':' as a directional local label.
if (Lexer.is(AsmToken::Integer)) {
4
←
Taking false branch→
  LocalLabelVal = getTok().getIntVal();
  if (LocalLabelVal < 0) {
    if (!TheCondState.Ignore) {
      Lex(); // always eat a token
      return Error(IDLoc, "unexpected token at start of statement");
    }
    IDVal = "";
  } else {
    IDVal = getTok().getString();
    Lex(); // Consume the integer token to be used as an identifier token.
    if (Lexer.getKind() != AsmToken::Colon) {
      if (!TheCondState.Ignore) {
        Lex(); // always eat a token
        return Error(IDLoc, "unexpected token at start of statement");
      }
    }
  }
} else if (Lexer.is(AsmToken::Dot)) {
5
←
Taking false branch→
  // Treat '.' as a valid identifier in this context.
  Lex();
  IDVal = ".";
} else if (Lexer.is(AsmToken::LCurly)) {
6
←
Taking false branch→
  // Treat '{' as a valid identifier in this context.
  Lex();
  IDVal = "{";

} else if (Lexer.is(AsmToken::RCurly)) {
7
←
Taking false branch→
  // Treat '}' as a valid identifier in this context.
  Lex();
  IDVal = "}";
} else if (Lexer.is(AsmToken::Star) &&
           getTargetParser().starIsStartOfStatement()) {
  // Accept '*' as a valid start of statement.
  Lex();
  IDVal = "*";
} else if (parseIdentifier(IDVal)) {
8
←
Assuming the condition is false→
9
←
Taking false branch→
  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())
10
←
'?' condition is false→
                            ? DK_NO_DIRECTIVE
                            : DirKindIt->getValue();
switch (DirKind) {
11
←
Control jumps to the 'default' case at line 1850→
default:
  break;
12
←
 Execution continues on line 1887→
case DK_IF:
case DK_IFEQ:
case DK_IFGE:
case DK_IFGT:
case DK_IFLE:
case DK_IFLT:
case DK_IFNE:
  return parseDirectiveIf(IDLoc, DirKind);
case DK_IFB:
  return parseDirectiveIfb(IDLoc, true);
case DK_IFNB:
  return parseDirectiveIfb(IDLoc, false);
case DK_IFC:
  return parseDirectiveIfc(IDLoc, true);
case DK_IFEQS:
  return parseDirectiveIfeqs(IDLoc, true);
case DK_IFNC:
  return parseDirectiveIfc(IDLoc, false);
case DK_IFNES:
  return parseDirectiveIfeqs(IDLoc, false);
case DK_IFDEF:
  return parseDirectiveIfdef(IDLoc, true);
case DK_IFNDEF:
case DK_IFNOTDEF:
  return parseDirectiveIfdef(IDLoc, false);
case DK_ELSEIF:
  return parseDirectiveElseIf(IDLoc);
case DK_ELSE:
  return parseDirectiveElse(IDLoc);
case DK_ENDIF:
  return parseDirectiveEndIf(IDLoc);
}

// Ignore the statement if in the middle of inactive conditional
// (e.g. ".if 0").
if (TheCondState.Ignore) {
13
←
Assuming field 'Ignore' is false→
14
←
Taking false branch→
  eatToEndOfStatement();
  return false;
}

// FIXME: Recurse on local labels?

// See what kind of statement we have.
switch (Lexer.getKind()) {
15
←
Control jumps to the 'default' case at line 1972→
case AsmToken::Colon: {
  if (!getTargetParser().isLabel(ID))
    break;
  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 (LocalLabelVal == -1) {
    if (ParsingMSInlineAsm && SI) {
      StringRef RewrittenLabel =
          SI->LookupInlineAsmLabel(IDVal, getSourceManager(), IDLoc, true);
      assert(!RewrittenLabel.empty() &&((void)0)
             "We should have an internal name here.")((void)0);
      Info.AsmRewrites->emplace_back(AOK_Label, IDLoc, IDVal.size(),
                                     RewrittenLabel);
      IDVal = RewrittenLabel;
    }
    Sym = getContext().getOrCreateSymbol(IDVal);
  } else
    Sym = Ctx.createDirectionalLocalSymbol(LocalLabelVal);
  // 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)) {
    StringRef CommentStr = parseStringToEndOfStatement();
    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();
  }

  if (discardLTOSymbol(IDVal))
    return false;

  getTargetParser().doBeforeLabelEmit(Sym);

  // 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;
}

case AsmToken::Equal:
  if (!getTargetParser().equalIsAsmAssignment())
    break;
  // identifier '=' ... -> assignment statement
  Lex();

  return parseAssignment(IDVal, true);

default: // Normal instruction or directive.
  break;
16
←
 Execution continues on line 1977→
}

// If macros are enabled, check to see if this is a macro instantiation.
if (areMacrosEnabled())
17
←
Assuming the condition is false→
18
←
Taking false branch→
  if (const MCAsmMacro *M = getContext().lookupMacro(IDVal)) {
    return handleMacroEntry(M, IDLoc);
  }

// Otherwise, we have a normal instruction or directive.

// Directives start with "."
if (IDVal.startswith(".") && IDVal != ".") {
19
←
Assuming the condition is true→
20
←
Taking true branch→
  // There are several entities interested in parsing directives:
  //
  // 1. The target-specific assembly parser. Some directives are target
  //    specific or may potentially behave differently on certain targets.
  // 2. Asm parser extensions. For example, platform-specific parsers
  //    (like the ELF parser) register themselves as extensions.
  // 3. The generic directive parser implemented by this class. These are
  //    all the directives that behave in a target and platform independent
  //    manner, or at least have a default behavior that's shared between
  //    all targets and platforms.

  getTargetParser().flushPendingInstructions(getStreamer());

  SMLoc StartTokLoc = getTok().getLoc();
  bool TPDirectiveReturn = getTargetParser().ParseDirective(ID);

  if (hasPendingError())
21
←
Taking false branch→
    return true;
  // Currently the return value should be true if we are
  // uninterested but as this is at odds with the standard parsing
  // convention (return true = error) we have instances of a parsed
  // directive that fails returning true as an error. Catch these
  // cases as best as possible errors here.
  if (TPDirectiveReturn && StartTokLoc != getTok().getLoc())
22
←
Assuming 'TPDirectiveReturn' is true→
23
←
Taking false branch→
    return true;
  // Return if we did some parsing or believe we succeeded.
  if (!TPDirectiveReturn23.1
'TPDirectiveReturn' is true
1
'TPDirectiveReturn' is true
1
'TPDirectiveReturn' is true
 || StartTokLoc != getTok().getLoc())
24
←
Taking false branch→
    return false;

  // Next, check the extension directive map to see if any extension has
  // registered itself to parse this directive.
  std::pair<MCAsmParserExtension *, DirectiveHandler> Handler =
      ExtensionDirectiveMap.lookup(IDVal);
  if (Handler.first)
25
←
Assuming field 'first' is null→
26
←
Taking false branch→
    return (*Handler.second)(Handler.first, IDVal, IDLoc);

  // Finally, if no one else is interested in this directive, it must be
  // generic and familiar to this class.
  switch (DirKind) {
27
←
Control jumps to 'case DK_PSEUDO_PROBE:'  at line 2287→
  default:
    break;
  case DK_SET:
  case DK_EQU:
    return parseDirectiveSet(IDVal, true);
  case DK_EQUIV:
    return parseDirectiveSet(IDVal, false);
  case DK_ASCII:
    return parseDirectiveAscii(IDVal, false);
  case DK_ASCIZ:
  case DK_STRING:
    return parseDirectiveAscii(IDVal, true);
  case DK_BYTE:
  case DK_DC_B:
    return parseDirectiveValue(IDVal, 1);
  case DK_DC:
  case DK_DC_W:
  case DK_SHORT:
  case DK_VALUE:
  case DK_2BYTE:
    return parseDirectiveValue(IDVal, 2);
  case DK_LONG:
  case DK_INT:
  case DK_4BYTE:
  case DK_DC_L:
    return parseDirectiveValue(IDVal, 4);
  case DK_QUAD:
  case DK_8BYTE:
    return parseDirectiveValue(IDVal, 8);
  case DK_DC_A:
    return parseDirectiveValue(
        IDVal, getContext().getAsmInfo()->getCodePointerSize());
  case DK_OCTA:
    return parseDirectiveOctaValue(IDVal);
  case DK_SINGLE:
  case DK_FLOAT:
  case DK_DC_S:
    return parseDirectiveRealValue(IDVal, APFloat::IEEEsingle());
  case DK_DOUBLE:
  case DK_DC_D:
    return parseDirectiveRealValue(IDVal, APFloat::IEEEdouble());
  case DK_ALIGN: {
    bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
    return parseDirectiveAlign(IsPow2, /*ExprSize=*/1);
  }
  case DK_ALIGN32: {
    bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
    return parseDirectiveAlign(IsPow2, /*ExprSize=*/4);
  }
  case DK_BALIGN:
    return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1);
  case DK_BALIGNW:
    return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2);
  case DK_BALIGNL:
    return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4);
  case DK_P2ALIGN:
    return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
  case DK_P2ALIGNW:
    return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2);
  case DK_P2ALIGNL:
    return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
  case DK_ORG:
    return parseDirectiveOrg();
  case DK_FILL:
    return parseDirectiveFill();
  case DK_ZERO:
    return parseDirectiveZero();
  case DK_EXTERN:
    eatToEndOfStatement(); // .extern is the default, ignore it.
    return false;
  case DK_GLOBL:
  case DK_GLOBAL:
    return parseDirectiveSymbolAttribute(MCSA_Global);
  case DK_LAZY_REFERENCE:
    return parseDirectiveSymbolAttribute(MCSA_LazyReference);
  case DK_NO_DEAD_STRIP:
    return parseDirectiveSymbolAttribute(MCSA_NoDeadStrip);
  case DK_SYMBOL_RESOLVER:
    return parseDirectiveSymbolAttribute(MCSA_SymbolResolver);
  case DK_PRIVATE_EXTERN:
    return parseDirectiveSymbolAttribute(MCSA_PrivateExtern);
  case DK_REFERENCE:
    return parseDirectiveSymbolAttribute(MCSA_Reference);
  case DK_WEAK_DEFINITION:
    return parseDirectiveSymbolAttribute(MCSA_WeakDefinition);
  case DK_WEAK_REFERENCE:
    return parseDirectiveSymbolAttribute(MCSA_WeakReference);
  case DK_WEAK_DEF_CAN_BE_HIDDEN:
    return parseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate);
  case DK_COLD:
    return parseDirectiveSymbolAttribute(MCSA_Cold);
  case DK_COMM:
  case DK_COMMON:
    return parseDirectiveComm(/*IsLocal=*/false);
  case DK_LCOMM:
    return parseDirectiveComm(/*IsLocal=*/true);
  case DK_ABORT:
    return parseDirectiveAbort();
  case DK_INCLUDE:
    return parseDirectiveInclude();
  case DK_INCBIN:
    return parseDirectiveIncbin();
  case DK_CODE16:
  case DK_CODE16GCC:
    return TokError(Twine(IDVal) +
                    " not currently supported for this target");
  case DK_REPT:
    return parseDirectiveRept(IDLoc, IDVal);
  case DK_IRP:
    return parseDirectiveIrp(IDLoc);
  case DK_IRPC:
    return parseDirectiveIrpc(IDLoc);
  case DK_ENDR:
    return parseDirectiveEndr(IDLoc);
  case DK_BUNDLE_ALIGN_MODE:
    return parseDirectiveBundleAlignMode();
  case DK_BUNDLE_LOCK:
    return parseDirectiveBundleLock();
  case DK_BUNDLE_UNLOCK:
    return parseDirectiveBundleUnlock();
  case DK_SLEB128:
    return parseDirectiveLEB128(true);
  case DK_ULEB128:
    return parseDirectiveLEB128(false);
  case DK_SPACE:
  case DK_SKIP:
    return parseDirectiveSpace(IDVal);
  case DK_FILE:
    return parseDirectiveFile(IDLoc);
  case DK_LINE:
    return parseDirectiveLine();
  case DK_LOC:
    return parseDirectiveLoc();
  case DK_STABS:
    return parseDirectiveStabs();
  case DK_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();
  case DK_CFI_ADJUST_CFA_OFFSET:
    return parseDirectiveCFIAdjustCfaOffset();
  case DK_CFI_DEF_CFA_REGISTER:
    return parseDirectiveCFIDefCfaRegister(IDLoc);
  case DK_CFI_LLVM_DEF_ASPACE_CFA:
    return parseDirectiveCFILLVMDefAspaceCfa(IDLoc);
  case DK_CFI_OFFSET:
    return parseDirectiveCFIOffset(IDLoc);
  case DK_CFI_REL_OFFSET:
    return parseDirectiveCFIRelOffset(IDLoc);
  case DK_CFI_PERSONALITY:
    return parseDirectiveCFIPersonalityOrLsda(true);
  case DK_CFI_LSDA:
    return parseDirectiveCFIPersonalityOrLsda(false);
  case DK_CFI_REMEMBER_STATE:
    return parseDirectiveCFIRememberState();
  case DK_CFI_RESTORE_STATE:
    return parseDirectiveCFIRestoreState();
  case DK_CFI_SAME_VALUE:
    return parseDirectiveCFISameValue(IDLoc);
  case DK_CFI_RESTORE:
    return parseDirectiveCFIRestore(IDLoc);
  case DK_CFI_ESCAPE:
    return parseDirectiveCFIEscape();
  case DK_CFI_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();
  case DK_MACROS_ON:
  case DK_MACROS_OFF:
    return parseDirectiveMacrosOnOff(IDVal);
  case DK_MACRO:
    return parseDirectiveMacro(IDLoc);
  case DK_ALTMACRO:
  case DK_NOALTMACRO:
    return parseDirectiveAltmacro(IDVal);
  case DK_EXITM:
    return parseDirectiveExitMacro(IDVal);
  case DK_ENDM:
  case DK_ENDMACRO:
    return parseDirectiveEndMacro(IDVal);
  case DK_PURGEM:
    return parseDirectivePurgeMacro(IDLoc);
  case DK_END:
    return parseDirectiveEnd(IDLoc);
  case DK_ERR:
    return parseDirectiveError(IDLoc, false);
  case DK_ERROR:
    return parseDirectiveError(IDLoc, true);
  case DK_WARNING:
    return parseDirectiveWarning(IDLoc);
  case DK_RELOC:
    return parseDirectiveReloc(IDLoc);
  case DK_DCB:
  case DK_DCB_W:
    return parseDirectiveDCB(IDVal, 2);
  case DK_DCB_B:
    return parseDirectiveDCB(IDVal, 1);
  case DK_DCB_D:
    return parseDirectiveRealDCB(IDVal, APFloat::IEEEdouble());
  case DK_DCB_L:
    return parseDirectiveDCB(IDVal, 4);
  case DK_DCB_S:
    return parseDirectiveRealDCB(IDVal, APFloat::IEEEsingle());
  case DK_DC_X:
  case DK_DCB_X:
    return TokError(Twine(IDVal) +
                    " not currently supported for this target");
  case DK_DS:
  case DK_DS_W:
    return parseDirectiveDS(IDVal, 2);
  case DK_DS_B:
    return parseDirectiveDS(IDVal, 1);
  case DK_DS_D:
    return parseDirectiveDS(IDVal, 8);
  case DK_DS_L:
  case DK_DS_S:
    return parseDirectiveDS(IDVal, 4);
  case DK_DS_P:
  case DK_DS_X:
    return parseDirectiveDS(IDVal, 12);
  case DK_PRINT:
    return parseDirectivePrint(IDLoc);
  case DK_ADDRSIG:
    return parseDirectiveAddrsig();
  case DK_ADDRSIG_SYM:
    return parseDirectiveAddrsigSym();
  case DK_PSEUDO_PROBE:
    return parseDirectivePseudoProbe();
28
←
Calling 'AsmParser::parseDirectivePseudoProbe'→
  case DK_LTO_DISCARD:
    return parseDirectiveLTODiscard();
  }

  return Error(IDLoc, "unknown directive");
}

// __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;

return parseAndMatchAndEmitTargetInstruction(Info, IDVal, ID, IDLoc);
2311}

2313bool AsmParser::parseAndMatchAndEmitTargetInstruction(ParseStatementInfo &Info,
                                                    StringRef IDVal,
                                                    AsmToken ID,
                                                    SMLoc IDLoc) {
// 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_STMT1 ? DWARF2_FLAG_IS_STMT(1 << 0) : 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;
2383}

2385// Parse and erase curly braces marking block start/end
2386bool
2387AsmParser::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;
2401}

2403/// parseCppHashLineFilenameComment as this:
2404///   ::= # number "filename"
2405bool AsmParser::parseCppHashLineFilenameComment(SMLoc L, bool SaveLocInfo) {
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) &&((void)0)
       "Lexing Cpp line comment: Expected Integer")((void)0);
int64_t LineNumber = getTok().getIntVal();
Lex();
assert(getTok().is(AsmToken::String) &&((void)0)
       "Lexing Cpp line comment: Expected String")((void)0);
StringRef Filename = getTok().getString();
Lex();

if (!SaveLocInfo)
  return false;

// 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;
2433}

2435/// will use the last parsed cpp hash line filename comment
2436/// for the Filename and LineNo if any in the diagnostic.
2437void AsmParser::DiagHandler(const SMDiagnostic &Diag, void *Context) {
auto *Parser = static_cast<AsmParser *>(Context);
raw_ostream &OS = errs();

const SourceMgr &DiagSrcMgr = *Diag.getSourceMgr();
SMLoc DiagLoc = Diag.getLoc();
unsigned DiagBuf = DiagSrcMgr.FindBufferContainingLoc(DiagLoc);
unsigned CppHashBuf =
    Parser->SrcMgr.FindBufferContainingLoc(Parser->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 || DiagBuf != CppHashBuf) {
  if (Parser->SavedDiagHandler)
    Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext);
  else
    Parser->getContext().diagnose(Diag);
  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(Diag, Parser->SavedDiagContext);
else
  Parser->getContext().diagnose(NewDiag);
2486}

2488// FIXME: This is mostly duplicated from the function in AsmLexer.cpp. The
2489// difference being that that function accepts '@' as part of identifiers and
2490// we can't do that. AsmLexer.cpp should probably be changed to handle
2491// '@' as a special case when needed.
2492static bool isIdentifierChar(char c) {
return isalnum(static_cast<unsigned char>(c)) || c == '_' || c == '$' ||
       c == '.';
2495}

2497bool AsmParser::expandMacro(raw_svector_ostream &OS, StringRef Body,
                          ArrayRef<MCAsmMacroParameter> Parameters,
                          ArrayRef<MCAsmMacroArgument> A,
                          bool EnableAtPseudoVariable, SMLoc L) {
unsigned NParameters = Parameters.size();
bool HasVararg = NParameters ? Parameters.back().Vararg : false;
if ((!IsDarwin || NParameters != 0) && NParameters != A.size())
  return Error(L, "Wrong number of arguments");

// A macro without parameters is handled differently on Darwin:
// gas accepts no arguments and does no substitutions
while (!Body.empty()) {
  // Scan for the next substitution.
  std::size_t End = Body.size(), Pos = 0;
  for (; Pos != End; ++Pos) {
    // Check for a substitution or escape.
    if (IsDarwin && !NParameters) {
      // This macro has no parameters, look for $0, $1, etc.
      if (Body[Pos] != '$' || Pos + 1 == End)
        continue;

      char Next = Body[Pos + 1];
      if (Next == '$' || Next == 'n' ||
          isdigit(static_cast<unsigned char>(Next)))
        break;
    } else {
      // This macro has parameters, look for \foo, \bar, etc.
      if (Body[Pos] == '\\' && Pos + 1 != End)
        break;
    }
  }

  // Add the prefix.
  OS << Body.slice(0, Pos);

  // Check if we reached the end.
  if (Pos == End)
    break;

  if (IsDarwin && !NParameters) {
    switch (Body[Pos + 1]) {
    // $$ => $
    case '$':
      OS << '$';
      break;

    // $n => number of arguments
    case 'n':
      OS << A.size();
      break;

    // $[0-9] => argument
    default: {
      // Missing arguments are ignored.
      unsigned Index = Body[Pos + 1] - '0';
      if (Index >= A.size())
        break;

      // Otherwise substitute with the token values, with spaces eliminated.
      for (const AsmToken &Token : A[Index])
        OS << Token.getString();
      break;
    }
    }
    Pos += 2;
  } else {
    unsigned I = Pos + 1;

    // Check for the \@ pseudo-variable.
    if (EnableAtPseudoVariable && Body[I] == '@' && I + 1 != End)
      ++I;
    else
      while (isIdentifierChar(Body[I]) && I + 1 != End)
        ++I;

    const char *Begin = Body.data() + Pos + 1;
    StringRef Argument(Begin, I - (Pos + 1));
    unsigned Index = 0;

    if (Argument == "@") {
      OS << NumOfMacroInstantiations;
      Pos += 2;
    } else {
      for (; Index < NParameters; ++Index)
        if (Parameters[Index].Name == Argument)
          break;

      if (Index == NParameters) {
        if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')')
          Pos += 3;
        else {
          OS << '\\' << Argument;
          Pos = I;
        }
      } else {
        bool VarargParameter = HasVararg && Index == (NParameters - 1);
        for (const AsmToken &Token : A[Index])
          // For altmacro mode, 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 (AltMacroMode && Token.getString().front() == '%' &&
              Token.is(AsmToken::Integer))
            // Emit an integer value to the buffer.
            OS << Token.getIntVal();
          // Only Token that was validated as a string and begins with '<'
          // is considered altMacroString!!!
          else if (AltMacroMode && Token.getString().front() == '<' &&
                   Token.is(AsmToken::String)) {
            OS << angleBracketString(Token.getStringContents());
          }
          // We expect no quotes around the string's contents when
          // parsing for varargs.
          else if (Token.isNot(AsmToken::String) || VarargParameter)
            OS << Token.getString();
          else
            OS << Token.getStringContents();

        Pos += 1 + Argument.size();
      }
    }
  }
  // Update the scan point.
  Body = Body.substr(Pos);
}

return false;
2627}

2629static 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;
}
2657}

2659namespace {

2661class AsmLexerSkipSpaceRAII {
2662public:
AsmLexerSkipSpaceRAII(AsmLexer &Lexer, bool SkipSpace) : Lexer(Lexer) {
  Lexer.setSkipSpace(SkipSpace);
}

~AsmLexerSkipSpaceRAII() {
  Lexer.setSkipSpace(true);
}

2671private:
AsmLexer &Lexer;
2673};

2675} // end anonymous namespace

2677bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg) {

if (Vararg) {
  if (Lexer.isNot(AsmToken::EndOfStatement)) {
    StringRef Str = parseStringToEndOfStatement();
    MA.emplace_back(AsmToken::String, Str);
  }
  return false;
}

unsigned ParenLevel = 0;

// 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 in macro instantiation");

  if (ParenLevel == 0) {

    if (Lexer.is(AsmToken::Comma))
      break;

    if (Lexer.is(AsmToken::Space)) {
      SpaceEaten = true;
      Lexer.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())) {
        MA.push_back(getTok());
        Lexer.Lex();

        // Whitespace after an operator can be ignored.
        if (Lexer.is(AsmToken::Space))
          Lexer.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(AsmToken::EndOfStatement))
    break;

  // Adjust the current parentheses level.
  if (Lexer.is(AsmToken::LParen))
    ++ParenLevel;
  else if (Lexer.is(AsmToken::RParen) && ParenLevel)
    --ParenLevel;

  // Append the token to the current argument list.
  MA.push_back(getTok());
  Lexer.Lex();
}

if (ParenLevel != 0)
  return TokError("unbalanced parentheses in macro argument");
return false;
2747}

2749// Parse the macro instantiation arguments.
2750bool AsmParser::parseMacroArguments(const MCAsmMacro *M,
                                  MCAsmMacroArguments &A) {
const unsigned NParameters = M ? M->Parameters.size() : 0;
bool NamedParametersFound = false;
SmallVector<SMLoc, 4> FALocs;

A.resize(NParameters);
FALocs.resize(NParameters);

// Parse two kinds of macro invocations:
// - macros defined without any parameters accept an arbitrary number of them
// - macros defined with parameters accept at most that many of them
bool HasVararg = NParameters ? M->Parameters.back().Vararg : false;
for (unsigned Parameter = 0; !NParameters || Parameter < NParameters;
     ++Parameter) {
  SMLoc IDLoc = Lexer.getLoc();
  MCAsmMacroParameter FA;

  if (Lexer.is(AsmToken::Identifier) && Lexer.peekTok().is(AsmToken::Equal)) {
    if (parseIdentifier(FA.Name))
      return Error(IDLoc, "invalid argument identifier for formal argument");

    if (Lexer.isNot(AsmToken::Equal))
      return TokError("expected '=' after formal parameter identifier");

    Lex();

    NamedParametersFound = true;
  }
  bool Vararg = HasVararg && Parameter == (NParameters - 1);

  if (NamedParametersFound && FA.Name.empty())
    return Error(IDLoc, "cannot mix positional and keyword arguments");

  SMLoc StrLoc = Lexer.getLoc();
  SMLoc EndLoc;
  if (AltMacroMode && 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 (AltMacroMode && Lexer.is(AsmToken::Less) &&
             isAngleBracketString(StrLoc, EndLoc)) {
    const char *StrChar = StrLoc.getPointer();
    const char *EndChar = EndLoc.getPointer();
    jumpToLoc(EndLoc, CurBuffer);
    /// Eat from '<' to '>'
    Lex();
    AsmToken newToken(AsmToken::String,
                      StringRef(StrChar, EndChar - StrChar));
    FA.Value.push_back(newToken);
  } else if(parseMacroArgument(FA.Value, Vararg))
    return true;

  unsigned PI = Parameter;
  if (!FA.Name.empty()) {
    unsigned FAI = 0;
    for (FAI = 0; FAI < NParameters; ++FAI)
      if (M->Parameters[FAI].Name == FA.Name)
        break;

    if (FAI >= NParameters) {
      assert(M && "expected macro to be defined")((void)0);
      return Error(IDLoc, "parameter named '" + FA.Name +
                              "' does not exist for macro '" + M->Name + "'");
    }
    PI = FAI;
  }

  if (!FA.Value.empty()) {
    if (A.size() <= PI)
      A.resize(PI + 1);
    A[PI] = FA.Value;

    if (FALocs.size() <= PI)
      FALocs.resize(PI + 1);

    FALocs[PI] = Lexer.getLoc();
  }

  // At the end of the statement, fill in remaining arguments that have
  // default values. If there aren't any, then the next argument is
  // required but missing
  if (Lexer.is(AsmToken::EndOfStatement)) {
    bool Failure = false;
    for (unsigned FAI = 0; FAI < NParameters; ++FAI) {
      if (A[FAI].empty()) {
        if (M->Parameters[FAI].Required) {
          Error(FALocs[FAI].isValid() ? FALocs[FAI] : Lexer.getLoc(),
                "missing value for required parameter "
                "'" + M->Parameters[FAI].Name + "' in macro '" + M->Name + "'");
          Failure = true;
        }

        if (!M->Parameters[FAI].Value.empty())
          A[FAI] = M->Parameters[FAI].Value;
      }
    }
    return Failure;
  }

  if (Lexer.is(AsmToken::Comma))
    Lex();
}

return TokError("too many positional arguments");
2866}

2868bool AsmParser::handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc) {
// 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))
  return true;

// Macro instantiation is lexical, unfortunately. We construct a new buffer
// to hold the macro body with substitutions.
SmallString<256> Buf;
StringRef Body = M->Body;
raw_svector_ostream OS(Buf);

if (expandMacro(OS, Body, M->Parameters, A, true, getTok().getLoc()))
  return true;

// We include the .endmacro in the buffer as our cue to exit the macro
// instantiation.
OS << ".endmacro\n";

std::unique_ptr<MemoryBuffer> Instantiation =
    MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");

// Create the macro instantiation object and add to the current macro
// instantiation stack.
MacroInstantiation *MI = new MacroInstantiation{
    NameLoc, CurBuffer, getTok().getLoc(), TheCondStack.size()};
ActiveMacros.push_back(MI);

++NumOfMacroInstantiations;

// Jump to the macro instantiation and prime the lexer.
CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc());
Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
Lex();

return false;
2915}

2917void AsmParser::handleMacroExit() {
// Jump to the EndOfStatement we should return to, and consume it.
jumpToLoc(ActiveMacros.back()->ExitLoc, ActiveMacros.back()->ExitBuffer);
Lex();

// Pop the instantiation entry.
delete ActiveMacros.back();
ActiveMacros.pop_back();
2925}

2927bool AsmParser::parseAssignment(StringRef Name, bool allow_redef,
                              bool NoDeadStrip) {
MCSymbol *Sym;
const MCExpr *Value;
if (MCParserUtils::parseAssignmentExpression(Name, allow_redef, *this, Sym,
                                             Value))
  return true;

if (!Sym) {
  // In the case where we parse an expression starting with a '.', we will
  // not generate an error, nor will we create a symbol.  In this case we
  // should just return out.
  return false;
}

if (discardLTOSymbol(Name))
  return false;

// Do the assignment.
Out.emitAssignment(Sym, Value);
if (NoDeadStrip)
  Out.emitSymbolAttribute(Sym, MCSA_NoDeadStrip);

return false;
2951}

2953/// parseIdentifier:
2954///   ::= identifier
2955///   ::= string
2956bool AsmParser::parseIdentifier(StringRef &Res) {
// The assembler has relaxed rules for accepting identifiers, in particular we
// allow things like '.globl $foo' and '.def @feat.00', which would normally be
// separate tokens. At this level, we have already lexed so we cannot (currently)
// handle this as a context dependent token, instead we detect adjacent tokens
// and return the combined identifier.
if (Lexer.is(AsmToken::Dollar) || Lexer.is(AsmToken::At)) {
  SMLoc PrefixLoc = getLexer().getLoc();

  // Consume the prefix character, and check for a following identifier.

  AsmToken Buf[1];
  Lexer.peekTokens(Buf, false);

  if (Buf[0].isNot(AsmToken::Identifier) && Buf[0].isNot(AsmToken::Integer))
    return true;

  // We have a '$' or '@' followed by an identifier or integer token, make
  // sure they are adjacent.
  if (PrefixLoc.getPointer() + 1 != Buf[0].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().getString().size() + 1);
  Lex(); // Parser Lex to maintain invariants.
  return false;
}

if (Lexer.isNot(AsmToken::Identifier) && Lexer.isNot(AsmToken::String))
  return true;

Res = getTok().getIdentifier();

Lex(); // Consume the identifier token.

return false;
2994}

2996/// parseDirectiveSet:
2997///   ::= .equ identifier ',' expression
2998///   ::= .equiv identifier ',' expression
2999///   ::= .set identifier ',' expression
3000bool AsmParser::parseDirectiveSet(StringRef IDVal, bool allow_redef) {
StringRef Name;
if (check(parseIdentifier(Name), "expected identifier") || parseComma() ||
    parseAssignment(Name, allow_redef, true))
  return true;
return false;
3006}

3008bool AsmParser::parseEscapedString(std::string &Data) {
if (check(getTok().isNot(AsmToken::String), "expected string"))
  return true;

Data = "";
StringRef Str = getTok().getStringContents();
for (unsigned i = 0, e = Str.size(); i != e; ++i) {
  if (Str[i] != '\\') {
    Data += Str[i];
    continue;
  }

  // Recognize escaped characters. Note that this escape semantics currently
  // loosely follows Darwin 'as'.
  ++i;
  if (i == e)
    return TokError("unexpected backslash at end of string");

  // Recognize hex sequences similarly to GNU 'as'.
  if (Str[i] == 'x' || Str[i] == 'X') {
    size_t length = Str.size();
    if (i + 1 >= length || !isHexDigit(Str[i + 1]))
      return TokError("invalid hexadecimal escape sequence");

    // Consume hex characters. GNU 'as' reads all hexadecimal characters and
    // then truncates to the lower 16 bits. Seems reasonable.
    unsigned Value = 0;
    while (i + 1 < length && isHexDigit(Str[i + 1]))
      Value = Value * 16 + hexDigitValue(Str[++i]);

    Data += (unsigned char)(Value & 0xFF);
    continue;
  }

  // Recognize octal sequences.
  if ((unsigned)(Str[i] - '0') <= 7) {
    // Consume up to three octal characters.
    unsigned Value = Str[i] - '0';

    if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) {
      ++i;
      Value = Value * 8 + (Str[i] - '0');

      if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) {
        ++i;
        Value = Value * 8 + (Str[i] - '0');
      }
    }

    if (Value > 255)
      return TokError("invalid octal escape sequence (out of range)");

    Data += (unsigned char)Value;
    continue;
  }

  // Otherwise recognize individual escapes.
  switch (Str[i]) {
  default:
    // Just reject invalid escape sequences for now.
    return TokError("invalid escape sequence (unrecognized character)");

  case 'b': Data += '\b'; break;
  case 'f': Data += '\f'; break;
  case 'n': Data += '\n'; break;
  case 'r': Data += '\r'; break;
  case 't': Data += '\t'; break;
  case '"': Data += '"'; break;
  case '\\': Data += '\\'; break;
  }
}

Lex();
return false;
3082}

3084bool AsmParser::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);
  /// Eat from '<' to '>'
  Lex();

  Data = angleBracketString(StringRef(StartChar, EndChar - StartChar));
  return false;
}
return true;
3097}

3099/// parseDirectiveAscii:
3100//    ::= .ascii [ "string"+ ( , "string"+ )* ]
3101///   ::= ( .asciz | .string ) [ "string" ( , "string" )* ]
3102bool AsmParser::parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) {
auto parseOp = [&]() -> bool {
  std::string Data;
  if (checkForValidSection())
    return true;
  // Only support spaces as separators for .ascii directive for now. See the
  // discusssion at https://reviews.llvm.org/D91460 for more details.
  do {
    if (parseEscapedString(Data))
      return true;
    getStreamer().emitBytes(Data);
  } while (!ZeroTerminated && getTok().is(AsmToken::String));
  if (ZeroTerminated)
    getStreamer().emitBytes(StringRef("\0", 1));
  return false;
};

return parseMany(parseOp);
3120}

3122/// parseDirectiveReloc
3123///  ::= .reloc expression , identifier [ , expression ]
3124bool AsmParser::parseDirectiveReloc(SMLoc DirectiveLoc) {
const MCExpr *Offset;
const MCExpr *Expr = nullptr;
SMLoc OffsetLoc = Lexer.getTok().getLoc();

if (parseExpression(Offset))
  return true;
if (parseComma() ||
    check(getTok().isNot(AsmToken::Identifier), "expected relocation name"))
  return true;

SMLoc NameLoc = Lexer.getTok().getLoc();
StringRef Name = Lexer.getTok().getIdentifier();
Lex();

if (Lexer.is(AsmToken::Comma)) {
  Lex();
  SMLoc ExprLoc = Lexer.getLoc();
  if (parseExpression(Expr))
    return true;

  MCValue Value;
  if (!Expr->evaluateAsRelocatable(Value, nullptr, nullptr))
    return Error(ExprLoc, "expression must be relocatable");
}

if (parseEOL())
  return true;

const MCTargetAsmParser &MCT = getTargetParser();
const MCSubtargetInfo &STI = MCT.getSTI();
if (Optional<std::pair<bool, std::string>> Err =
        getStreamer().emitRelocDirective(*Offset, Name, Expr, DirectiveLoc,
                                         STI))
  return Error(Err->first ? NameLoc : OffsetLoc, Err->second);

return false;
3161}

3163/// parseDirectiveValue
3164///  ::= (.byte | .short | ... ) [ expression (, expression)* ]
3165bool AsmParser::parseDirectiveValue(StringRef IDVal, unsigned Size) {
auto parseOp = [&]() -> bool {
  const MCExpr *Value;
  SMLoc ExprLoc = getLexer().getLoc();
  if (checkForValidSection() || parseExpression(Value))
    return true;
  // Special case constant expressions to match code generator.
  if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
    assert(Size <= 8 && "Invalid size")((void)0);
    uint64_t IntValue = MCE->getValue();
    if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue))
      return Error(ExprLoc, "out of range literal value");
    getStreamer().emitIntValue(IntValue, Size);
  } else
    getStreamer().emitValue(Value, Size, ExprLoc);
  return false;
};

return parseMany(parseOp);
3184}

3186static bool parseHexOcta(AsmParser &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;
3203}

3205/// ParseDirectiveOctaValue
3206///  ::= .octa [ hexconstant (, hexconstant)* ]

3208bool AsmParser::parseDirectiveOctaValue(StringRef IDVal) {
auto parseOp = [&]() -> bool {
  if (checkForValidSection())
    return true;
  uint64_t hi, lo;
  if (parseHexOcta(*this, hi, lo))
    return true;
  if (MAI.isLittleEndian()) {
    getStreamer().emitInt64(lo);
    getStreamer().emitInt64(hi);
  } else {
    getStreamer().emitInt64(hi);
    getStreamer().emitInt64(lo);
  }
  return false;
};

return parseMany(parseOp);
3226}

3228bool AsmParser::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;
if (getLexer().is(AsmToken::Minus)) {
  Lexer.Lex();
  IsNeg = true;
} else if (getLexer().is(AsmToken::Plus))
  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.compare_insensitive("infinity") ||
      !IDVal.compare_insensitive("inf"))
    Value = APFloat::getInf(Semantics);
  else if (!IDVal.compare_insensitive("nan"))
    Value = APFloat::getNaN(Semantics, false, ~0);
  else
    return TokError("invalid floating point literal");
} 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;
3268}

3270/// parseDirectiveRealValue
3271///  ::= (.single | .double) [ expression (, expression)* ]
3272bool AsmParser::parseDirectiveRealValue(StringRef IDVal,
                                      const fltSemantics &Semantics) {
auto parseOp = [&]() -> bool {
  APInt AsInt;
  if (checkForValidSection() || parseRealValue(Semantics, AsInt))
    return true;
  getStreamer().emitIntValue(AsInt.getLimitedValue(),
                             AsInt.getBitWidth() / 8);
  return false;
};

return parseMany(parseOp);
3284}

3286/// parseDirectiveZero
3287///  ::= .zero expression
3288bool AsmParser::parseDirectiveZero() {
SMLoc NumBytesLoc = Lexer.getLoc();
const MCExpr *NumBytes;
if (checkForValidSection() || parseExpression(NumBytes))
  return true;

int64_t Val = 0;
if (getLexer().is(AsmToken::Comma)) {
  Lex();
  if (parseAbsoluteExpression(Val))
    return true;
}

if (parseEOL())
  return true;
getStreamer().emitFill(*NumBytes, Val, NumBytesLoc);

return false;
3306}

3308/// parseDirectiveFill
3309///  ::= .fill expression [ , expression [ , expression ] ]
3310bool AsmParser::parseDirectiveFill() {
SMLoc NumValuesLoc = Lexer.getLoc();
const MCExpr *NumValues;
if (checkForValidSection() || parseExpression(NumValues))
  return true;

int64_t FillSize = 1;
int64_t FillExpr = 0;

SMLoc SizeLoc, ExprLoc;

if (parseOptionalToken(AsmToken::Comma)) {
  SizeLoc = getTok().getLoc();
  if (parseAbsoluteExpression(FillSize))
    return true;
  if (parseOptionalToken(AsmToken::Comma)) {
    ExprLoc = getTok().getLoc();
    if (parseAbsoluteExpression(FillExpr))
      return true;
  }
}
if (parseEOL())
  return true;

if (FillSize < 0) {
  Warning(SizeLoc, "'.fill' directive with negative size has no effect");
  return false;
}
if (FillSize > 8) {
  Warning(SizeLoc, "'.fill' directive with size greater than 8 has been truncated to 8");
  FillSize = 8;
}

if (!isUInt<32>(FillExpr) && FillSize > 4)
  Warning(ExprLoc, "'.fill' directive pattern has been truncated to 32-bits");

getStreamer().emitFill(*NumValues, FillSize, FillExpr, NumValuesLoc);

return false;
3349}

3351/// parseDirectiveOrg
3352///  ::= .org expression [ , expression ]
3353bool AsmParser::parseDirectiveOrg() {
const MCExpr *Offset;
SMLoc OffsetLoc = Lexer.getLoc();
if (checkForValidSection() || parseExpression(Offset))
  return true;

// Parse optional fill expression.
int64_t FillExpr = 0;
if (parseOptionalToken(AsmToken::Comma))
  if (parseAbsoluteExpression(FillExpr))
    return true;
if (parseEOL())
  return true;

getStreamer().emitValueToOffset(Offset, FillExpr, OffsetLoc);
return false;
3369}

3371/// parseDirectiveAlign
3372///  ::= {.align, ...} expression [ , expression [ , expression ]]
3373bool AsmParser::parseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
SMLoc AlignmentLoc = getLexer().getLoc();
int64_t Alignment;
SMLoc MaxBytesLoc;
bool HasFillExpr = false;
int64_t FillExpr = 0;
int64_t MaxBytesToFill = 0;

auto parseAlign = [&]() -> bool {
  if (parseAbsoluteExpression(Alignment))
    return true;
  if (parseOptionalToken(AsmToken::Comma)) {
    // The fill expression can be omitted while specifying a maximum number of
    // alignment bytes, e.g:
    //  .align 3,,4
    if (getTok().isNot(AsmToken::Comma)) {
      HasFillExpr = true;
      if (parseAbsoluteExpression(FillExpr))
        return true;
    }
    if (parseOptionalToken(AsmToken::Comma))
      if (parseTokenLoc(MaxBytesLoc) ||
          parseAbsoluteExpression(MaxBytesToFill))
        return true;
  }
  return parseEOL();
};

if (checkForValidSection())
  return true;
// Ignore empty '.p2align' directives for GNU-as compatibility
if (IsPow2 && (ValueSize == 1) && getTok().is(AsmToken::EndOfStatement)) {
  Warning(AlignmentLoc, "p2align directive with no operand(s) is ignored");
  return parseEOL();
}
if (parseAlign())
  return true;

// Always emit an alignment here even if we thrown an error.
bool ReturnVal = false;

// Compute alignment in bytes.
if (IsPow2) {
  // FIXME: Diagnose overflow.
  if (Alignment >= 32) {
    ReturnVal |= Error(AlignmentLoc, "invalid alignment value");
    Alignment = 31;
  }

  Alignment = 1ULL << Alignment;
} else {
  // Reject alignments that aren't either a power of two or zero,
  // for gas compatibility. Alignment of zero is silently rounded
  // up to one.
  if (Alignment == 0)
    Alignment = 1;
  if (!isPowerOf2_64(Alignment))
    ReturnVal |= Error(AlignmentLoc, "alignment must be a power of 2");
  if (!isUInt<32>(Alignment))
    ReturnVal |= Error(AlignmentLoc, "alignment must be smaller than 2**32");
}

// Diagnose non-sensical max bytes to align.
if (MaxBytesLoc.isValid()) {
  if (MaxBytesToFill < 1) {
    ReturnVal |= Error(MaxBytesLoc,
                       "alignment directive can never be satisfied in this "
                       "many bytes, ignoring maximum bytes expression");
    MaxBytesToFill = 0;
  }

  if (MaxBytesToFill >= Alignment) {
    Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and "
                         "has no effect");
    MaxBytesToFill = 0;
  }
}

// Check whether we should use optimal code alignment for this .align
// directive.
const MCSection *Section = getStreamer().getCurrentSectionOnly();
assert(Section && "must have section to emit alignment")((void)0);
bool UseCodeAlign = Section->UseCodeAlign();
if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) &&
    ValueSize == 1 && UseCodeAlign) {
  getStreamer().emitCodeAlignment(Alignment, MaxBytesToFill);
} else {
  // FIXME: Target specific behavior about how the "extra" bytes are filled.
  getStreamer().emitValueToAlignment(Alignment, FillExpr, ValueSize,
                                     MaxBytesToFill);
}

return ReturnVal;
3466}

3468/// parseDirectiveFile
3469/// ::= .file filename
3470/// ::= .file number [directory] filename [md5 checksum] [source source-text]
3471bool AsmParser::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 (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;

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);
  }

  Optional<MD5::MD5Result> CKMem;
  if (HasMD5) {
    MD5::MD5Result Sum;
    for (unsigned i = 0; i != 8; ++i) {
      Sum.Bytes[i] = uint8_t(MD5Hi >> ((7 - i) * 8));
      Sum.Bytes[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) {
    // Upgrade to Version 5 for assembly actions like clang -c a.s.
    if (Ctx.getDwarfVersion() < 5)
      Ctx.setDwarfVersion(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;
3584}

3586/// parseDirectiveLine
3587/// ::= .line [number]
3588bool AsmParser::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.
}
return parseEOL();
3597}

3599/// parseDirectiveLoc
3600/// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end]
3601///                                [epilogue_begin] [is_stmt VALUE] [isa VALUE]
3602/// The first number is a file number, must have been previously assigned with
3603/// a .file directive, the second number is the line number and optionally the
3604/// third number is a column position (zero if not specified).  The remaining
3605/// optional items are .loc sub-directives.
3606bool AsmParser::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(1 << 0);
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(1 << 1);
  else if (Name == "prologue_end")
    Flags |= DWARF2_FLAG_PROLOGUE_END(1 << 2);
  else if (Name == "epilogue_begin")
    Flags |= DWARF2_FLAG_EPILOGUE_BEGIN(1 << 3);
  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(1 << 0);
      else if (Value == 1)
        Flags |= DWARF2_FLAG_IS_STMT(1 << 0);
      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;
3696}

3698/// parseDirectiveStabs
3699/// ::= .stabs string, number, number, number
3700bool AsmParser::parseDirectiveStabs() {
return TokError("unsupported directive '.stabs'");
3702}

3704/// parseDirectiveCVFile
3705/// ::= .cv_file number filename [checksum] [checksumkind]
3706bool AsmParser::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") ||
      parseToken(AsmToken::EndOfStatement,
                 "unexpected token in '.cv_file' directive"))
    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;
3742}

3744bool AsmParser::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(2147483647 *2U +1U), Loc,
             "expected function id within range [0, UINT_MAX)");
3752}

3754bool AsmParser::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");
3763}

3765/// parseDirectiveCVFuncId
3766/// ::= .cv_func_id FunctionId
3767///
3768/// Introduces a function ID that can be used with .cv_loc.
3769bool AsmParser::parseDirectiveCVFuncId() {
SMLoc FunctionIdLoc = getTok().getLoc();
int64_t FunctionId;

if (parseCVFunctionId(FunctionId, ".cv_func_id") ||
    parseToken(AsmToken::EndOfStatement,
               "unexpected token in '.cv_func_id' directive"))
  return true;

if (!getStreamer().EmitCVFuncIdDirective(FunctionId))
  return Error(FunctionIdLoc, "function id already allocated");

return false;
3782}

3784/// parseDirectiveCVInlineSiteId
3785/// ::= .cv_inline_site_id FunctionId
3786///         "within" IAFunc
3787///         "inlined_at" IAFile IALine [IACol]
3788///
3789/// Introduces a function ID that can be used with .cv_loc. Includes "inlined
3790/// at" source location information for use in the line table of the caller,
3791/// whether the caller is a real function or another inlined call site.
3792bool AsmParser::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 (parseToken(AsmToken::EndOfStatement,
               "unexpected token in '.cv_inline_site_id' directive"))
  return true;

if (!getStreamer().EmitCVInlineSiteIdDirective(FunctionId, IAFunc, IAFile,
                                               IALine, IACol, FunctionIdLoc))
  return Error(FunctionIdLoc, "function id already allocated");

return false;
3843}

3845/// parseDirectiveCVLoc
3846/// ::= .cv_loc FunctionId FileNumber [LineNumber] [ColumnPos] [prologue_end]
3847///                                [is_stmt VALUE]
3848/// The first number is a file number, must have been previously assigned with
3849/// a .file directive, the second number is the line number and optionally the
3850/// third number is a column position (zero if not specified).  The remaining
3851/// optional items are .loc sub-directives.
3852bool AsmParser::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;
3910}

3912/// parseDirectiveCVLinetable
3913/// ::= .cv_linetable FunctionId, FnStart, FnEnd
3914bool AsmParser::parseDirectiveCVLinetable() {
int64_t FunctionId;
StringRef FnStartName, FnEndName;
SMLoc Loc = getTok().getLoc();
if (parseCVFunctionId(FunctionId, ".cv_linetable") || parseComma() ||
    parseTokenLoc(Loc) ||
    check(parseIdentifier(FnStartName), Loc,
          "expected identifier in directive") ||
    parseComma() || 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;
3932}

3934/// parseDirectiveCVInlineLinetable
3935/// ::= .cv_inline_linetable PrimaryFunctionId FileId LineNum FnStart FnEnd
3936bool AsmParser::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 (parseToken(AsmToken::EndOfStatement, "Expected End of Statement"))
  return true;

MCSymbol *FnStartSym = getContext().getOrCreateSymbol(FnStartName);
MCSymbol *FnEndSym = getContext().getOrCreateSymbol(FnEndName);
getStreamer().emitCVInlineLinetableDirective(PrimaryFunctionId, SourceFileId,
                                             SourceLineNum, FnStartSym,
                                             FnEndSym);
return false;
3968}

3970void AsmParser::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;
3975}

3977/// parseDirectiveCVDefRange
3978/// ::= .cv_def_range RangeStart RangeEnd (GapStart GapEnd)*, bytes*
3979bool AsmParser::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;
4084}

4086/// parseDirectiveCVString
4087/// ::= .cv_stringtable "string"
4088bool AsmParser::parseDirectiveCVString() {
std::string Data;
if (checkForValidSection() || parseEscapedString(Data))
  return true;

// Put the string in the table and emit the offset.
std::pair<StringRef, unsigned> Insertion =
    getCVContext().addToStringTable(Data);
getStreamer().emitInt32(Insertion.second);
return false;
4098}

4100/// parseDirectiveCVStringTable
4101/// ::= .cv_stringtable
4102bool AsmParser::parseDirectiveCVStringTable() {
getStreamer().emitCVStringTableDirective();
return false;
4105}

4107/// parseDirectiveCVFileChecksums
4108/// ::= .cv_filechecksums
4109bool AsmParser::parseDirectiveCVFileChecksums() {
getStreamer().emitCVFileChecksumsDirective();
return false;
4112}

4114/// parseDirectiveCVFileChecksumOffset
4115/// ::= .cv_filechecksumoffset fileno
4116bool AsmParser::parseDirectiveCVFileChecksumOffset() {
int64_t FileNo;
if (parseIntToken(FileNo, "expected identifier in directive"))
  return true;
if (parseToken(AsmToken::EndOfStatement, "Expected End of Statement"))
  return true;
getStreamer().emitCVFileChecksumOffsetDirective(FileNo);
return false;
4124}

4126/// parseDirectiveCVFPOData
4127/// ::= .cv_fpo_data procsym
4128bool AsmParser::parseDirectiveCVFPOData() {
SMLoc DirLoc = getLexer().getLoc();
StringRef ProcName;
if (parseIdentifier(ProcName))
  return TokError("expected symbol name");
if (parseEOL())
  return true;
MCSymbol *ProcSym = getContext().getOrCreateSymbol(ProcName);
getStreamer().EmitCVFPOData(ProcSym, DirLoc);
return false;
4138}

4140/// parseDirectiveCFISections
4141/// ::= .cfi_sections section [, section]
4142bool AsmParser::parseDirectiveCFISections() {
StringRef Name;
bool EH = false;
bool Debug = false;

if (!parseOptionalToken(AsmToken::EndOfStatement)) {
  for (;;) {
    if (parseIdentifier(Name))
      return TokError("expected .eh_frame or .debug_frame");
    if (Name == ".eh_frame")
      EH = true;
    else if (Name == ".debug_frame")
      Debug = true;
    if (parseOptionalToken(AsmToken::EndOfStatement))
      break;
    if (parseComma())
      return true;
  }
}
getStreamer().emitCFISections(EH, Debug);
return false;
4163}

4165/// parseDirectiveCFIStartProc
4166/// ::= .cfi_startproc [simple]
4167bool AsmParser::parseDirectiveCFIStartProc() {
StringRef Simple;
if (!parseOptionalToken(AsmToken::EndOfStatement)) {
  if (check(parseIdentifier(Simple) || Simple != "simple",
            "unexpected token") ||
      parseEOL())
    return true;
}

// TODO(kristina): Deal with a corner case of incorrect diagnostic context
// being produced if this directive is emitted as part of preprocessor macro
// expansion which can *ONLY* happen if Clang's cc1as is the API consumer.
// Tools like llvm-mc on the other hand are not affected by it, and report
// correct context information.
getStreamer().emitCFIStartProc(!Simple.empty(), Lexer.getLoc());
return false;
4183}

4185/// parseDirectiveCFIEndProc
4186/// ::= .cfi_endproc
4187bool AsmParser::parseDirectiveCFIEndProc() {
if (parseEOL())
  return true;
getStreamer().emitCFIEndProc();
return false;
4192}

4194/// parse register name or number.
4195bool AsmParser::parseRegisterOrRegisterNumber(int64_t &Register,
                                            SMLoc DirectiveLoc) {
unsigned RegNo;

if (getLexer().isNot(AsmToken::Integer)) {
  if (getTargetParser().ParseRegister(RegNo, DirectiveLoc, DirectiveLoc))
    return true;
  Register = getContext().getRegisterInfo()->getDwarfRegNum(RegNo, true);
} else
  return parseAbsoluteExpression(Register);

return false;
4207}

4209/// parseDirectiveCFIDefCfa
4210/// ::= .cfi_def_cfa register,  offset
4211bool AsmParser::parseDirectiveCFIDefCfa(SMLoc DirectiveLoc) {
int64_t Register = 0, Offset = 0;
if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseComma() ||
    parseAbsoluteExpression(Offset) || parseEOL())
  return true;

getStreamer().emitCFIDefCfa(Register, Offset);
return false;
4219}

4221/// parseDirectiveCFIDefCfaOffset
4222/// ::= .cfi_def_cfa_offset offset
4223bool AsmParser::parseDirectiveCFIDefCfaOffset() {
int64_t Offset = 0;
if (parseAbsoluteExpression(Offset) || parseEOL())
  return true;

getStreamer().emitCFIDefCfaOffset(Offset);
return false;
4230}

4232/// parseDirectiveCFIRegister
4233/// ::= .cfi_register register, register
4234bool AsmParser::parseDirectiveCFIRegister(SMLoc DirectiveLoc) {
int64_t Register1 = 0, Register2 = 0;
if (parseRegisterOrRegisterNumber(Register1, DirectiveLoc) || parseComma() ||
    parseRegisterOrRegisterNumber(Register2, DirectiveLoc) || parseEOL())
  return true;

getStreamer().emitCFIRegister(Register1, Register2);
return false;
4242}

4244/// parseDirectiveCFIWindowSave
4245/// ::= .cfi_window_save
4246bool AsmParser::parseDirectiveCFIWindowSave() {
if (parseEOL())
  return true;
getStreamer().emitCFIWindowSave();
return false;
4251}

4253/// parseDirectiveCFIAdjustCfaOffset
4254/// ::= .cfi_adjust_cfa_offset adjustment
4255bool AsmParser::parseDirectiveCFIAdjustCfaOffset() {
int64_t Adjustment = 0;
if (parseAbsoluteExpression(Adjustment) || parseEOL())
  return true;

getStreamer().emitCFIAdjustCfaOffset(Adjustment);
return false;
4262}

4264/// parseDirectiveCFIDefCfaRegister
4265/// ::= .cfi_def_cfa_register register
4266bool AsmParser::parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc) {
int64_t Register = 0;
if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL())
  return true;

getStreamer().emitCFIDefCfaRegister(Register);
return false;
4273}

4275/// parseDirectiveCFILLVMDefAspaceCfa
4276/// ::= .cfi_llvm_def_aspace_cfa register, offset, address_space
4277bool AsmParser::parseDirectiveCFILLVMDefAspaceCfa(SMLoc DirectiveLoc) {
int64_t Register = 0, Offset = 0, AddressSpace = 0;
if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseComma() ||
    parseAbsoluteExpression(Offset) || parseComma() ||
    parseAbsoluteExpression(AddressSpace) || parseEOL())
  return true;

getStreamer().emitCFILLVMDefAspaceCfa(Register, Offset, AddressSpace);
return false;
4286}

4288/// parseDirectiveCFIOffset
4289/// ::= .cfi_offset register, offset
4290bool AsmParser::parseDirectiveCFIOffset(SMLoc DirectiveLoc) {
int64_t Register = 0;
int64_t Offset = 0;

if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseComma() ||
    parseAbsoluteExpression(Offset) || parseEOL())
  return true;

getStreamer().emitCFIOffset(Register, Offset);
return false;
4300}

4302/// parseDirectiveCFIRelOffset
4303/// ::= .cfi_rel_offset register, offset
4304bool AsmParser::parseDirectiveCFIRelOffset(SMLoc DirectiveLoc) {
int64_t Register = 0, Offset = 0;

if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseComma() ||
    parseAbsoluteExpression(Offset) || parseEOL())
  return true;

getStreamer().emitCFIRelOffset(Register, Offset);
return false;
4313}

4315static bool isValidEncoding(int64_t Encoding) {
if (Encoding & ~0xff)
  return false;

if (Encoding == dwarf::DW_EH_PE_omit)
  return true;

const unsigned Format = Encoding & 0xf;
if (Format != dwarf::DW_EH_PE_absptr && Format != dwarf::DW_EH_PE_udata2 &&
    Format != dwarf::DW_EH_PE_udata4 && Format != dwarf::DW_EH_PE_udata8 &&
    Format != dwarf::DW_EH_PE_sdata2 && Format != dwarf::DW_EH_PE_sdata4 &&
    Format != dwarf::DW_EH_PE_sdata8 && Format != dwarf::DW_EH_PE_signed)
  return false;

const unsigned Application = Encoding & 0x70;
if (Application != dwarf::DW_EH_PE_absptr &&
    Application != dwarf::DW_EH_PE_pcrel)
  return false;

return true;
4335}

4337/// parseDirectiveCFIPersonalityOrLsda
4338/// IsPersonality true for cfi_personality, false for cfi_lsda
4339/// ::= .cfi_personality encoding, [symbol_name]
4340/// ::= .cfi_lsda encoding, [symbol_name]
4341bool AsmParser::parseDirectiveCFIPersonalityOrLsda(bool IsPersonality) {
int64_t Encoding = 0;
if (parseAbsoluteExpression(Encoding))
  return true;
if (Encoding == dwarf::DW_EH_PE_omit)
  return false;

StringRef Name;
if (check(!isValidEncoding(Encoding), "unsupported encoding.") ||
    parseComma() ||
    check(parseIdentifier(Name), "expected identifier in directive") ||
    parseEOL())
  return true;

MCSymbol *Sym = getContext().getOrCreateSymbol(Name);

if (IsPersonality)
  getStreamer().emitCFIPersonality(Sym, Encoding);
else
  getStreamer().emitCFILsda(Sym, Encoding);
return false;
4362}

4364/// parseDirectiveCFIRememberState
4365/// ::= .cfi_remember_state
4366bool AsmParser::parseDirectiveCFIRememberState() {
if (parseEOL())
  return true;
getStreamer().emitCFIRememberState();
return false;
4371}

4373/// parseDirectiveCFIRestoreState
4374/// ::= .cfi_remember_state
4375bool AsmParser::parseDirectiveCFIRestoreState() {
if (parseEOL())
  return true;
getStreamer().emitCFIRestoreState();
return false;
4380}

4382/// parseDirectiveCFISameValue
4383/// ::= .cfi_same_value register
4384bool AsmParser::parseDirectiveCFISameValue(SMLoc DirectiveLoc) {
int64_t Register = 0;

if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL())
  return true;

getStreamer().emitCFISameValue(Register);
return false;
4392}

4394/// parseDirectiveCFIRestore
4395/// ::= .cfi_restore register
4396bool AsmParser::parseDirectiveCFIRestore(SMLoc DirectiveLoc) {
int64_t Register = 0;
if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL())
  return true;

getStreamer().emitCFIRestore(Register);
return false;
4403}

4405/// parseDirectiveCFIEscape
4406/// ::= .cfi_escape expression[,...]
4407bool AsmParser::parseDirectiveCFIEscape() {
std::string Values;
int64_t CurrValue;
if (parseAbsoluteExpression(CurrValue))
  return true;

Values.push_back((uint8_t)CurrValue);

while (getLexer().is(AsmToken::Comma)) {
  Lex();

  if (parseAbsoluteExpression(CurrValue))
    return true;

  Values.push_back((uint8_t)CurrValue);
}

getStreamer().emitCFIEscape(Values);
return false;
4426}

4428/// parseDirectiveCFIReturnColumn
4429/// ::= .cfi_return_column register
4430bool AsmParser::parseDirectiveCFIReturnColumn(SMLoc DirectiveLoc) {
int64_t Register = 0;
if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL())
  return true;
getStreamer().emitCFIReturnColumn(Register);
return false;
4436}

4438/// parseDirectiveCFISignalFrame
4439/// ::= .cfi_signal_frame
4440bool AsmParser::parseDirectiveCFISignalFrame() {
if (parseEOL())
  return true;

getStreamer().emitCFISignalFrame();
return false;
4446}

4448/// parseDirectiveCFIUndefined
4449/// ::= .cfi_undefined register
4450bool AsmParser::parseDirectiveCFIUndefined(SMLoc DirectiveLoc) {
int64_t Register = 0;

if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL())
  return true;

getStreamer().emitCFIUndefined(Register);
return false;
4458}

4460/// parseDirectiveAltmacro
4461/// ::= .altmacro
4462/// ::= .noaltmacro
4463bool AsmParser::parseDirectiveAltmacro(StringRef Directive) {
if (parseEOL())
  return true;
AltMacroMode = (Directive == ".altmacro");
return false;
4468}

4470/// parseDirectiveMacrosOnOff
4471/// ::= .macros_on
4472/// ::= .macros_off
4473bool AsmParser::parseDirectiveMacrosOnOff(StringRef Directive) {
if (parseEOL())
  return true;
setMacrosEnabled(Directive == ".macros_on");
return false;
4478}

4480/// parseDirectiveMacro
4481/// ::= .macro name[,] [parameters]
4482bool AsmParser::parseDirectiveMacro(SMLoc DirectiveLoc) {
StringRef Name;
if (parseIdentifier(Name))
  return TokError("expected identifier in '.macro' directive");

if (getLexer().is(AsmToken::Comma))
  Lex();

MCAsmMacroParameters Parameters;
while (getLexer().isNot(AsmToken::EndOfStatement)) {

  if (!Parameters.empty() && Parameters.back().Vararg)
    return Error(Lexer.getLoc(), "vararg parameter '" +
                                     Parameters.back().Name +
                                     "' should be the last parameter");

  MCAsmMacroParameter Parameter;
  if (parseIdentifier(Parameter.Name))
    return TokError("expected identifier in '.macro' directive");

  // Emit an error if two (or more) named parameters share the same name
  for (const MCAsmMacroParameter& CurrParam : Parameters)
    if (CurrParam.Name.equals(Parameter.Name))
      return TokError("macro '" + Name + "' has multiple parameters"
                      " named '" + Parameter.Name + "'");

  if (Lexer.is(AsmToken::Colon)) {
    Lex();  // consume ':'

    SMLoc QualLoc;
    StringRef Qualifier;

    QualLoc = Lexer.getLoc();
    if (parseIdentifier(Qualifier))
      return Error(QualLoc, "missing parameter qualifier for "
                   "'" + Parameter.Name + "' in macro '" + Name + "'");

    if (Qualifier == "req")
      Parameter.Required = true;
    else if (Qualifier == "vararg")
      Parameter.Vararg = true;
    else
      return Error(QualLoc, Qualifier + " is not a valid parameter qualifier "
                   "for '" + Parameter.Name + "' in macro '" + Name + "'");
  }

  if (getLexer().is(AsmToken::Equal)) {
    Lex();

    SMLoc ParamLoc;

    ParamLoc = Lexer.getLoc();
    if (parseMacroArgument(Parameter.Value, /*Vararg=*/false ))
      return true;

    if (Parameter.Required)
      Warning(ParamLoc, "pointless default value for required parameter "
              "'" + Parameter.Name + "' in macro '" + Name + "'");
  }

  Parameters.push_back(std::move(Parameter));

  if (getLexer().is(AsmToken::Comma))
    Lex();
}

// Eat just the end of statement.
Lexer.Lex();

// Consuming deferred text, so use Lexer.Lex to ignore Lexing Errors
AsmToken EndToken, StartToken = getTok();
unsigned MacroDepth = 0;
// Lex the macro definition.
while (true) {
  // Ignore Lexing errors in macros.
  while (Lexer.is(AsmToken::Error)) {
    Lexer.Lex();
  }

  // Check whether we have reached the end of the file.
  if (getLexer().is(AsmToken::Eof))
    return Error(DirectiveLoc, "no matching '.endmacro' in definition");

  // Otherwise, check whether we have reach the .endmacro or the start of a
  // preprocessor line marker.
  if (getLexer().is(AsmToken::Identifier)) {
    if (getTok().getIdentifier() == ".endm" ||
        getTok().getIdentifier() == ".endmacro") {
      if (MacroDepth == 0) { // Outermost macro.
        EndToken = getTok();
        Lexer.Lex();
        if (getLexer().isNot(AsmToken::EndOfStatement))
          return TokError("unexpected token in '" + EndToken.getIdentifier() +
                          "' directive");
        break;
      } else {
        // Otherwise we just found the end of an inner macro.
        --MacroDepth;
      }
    } else if (getTok().getIdentifier() == ".macro") {
      // We allow nested macros. Those aren't instantiated until the outermost
      // macro is expanded so just ignore them for now.
      ++MacroDepth;
    }
  } else if (Lexer.is(AsmToken::HashDirective)) {
    (void)parseCppHashLineFilenameComment(getLexer().getLoc());
  }

  // Otherwise, scan til the end of the statement.
  eatToEndOfStatement();
}

if (getContext().lookupMacro(Name)) {
  return Error(DirectiveLoc, "macro '" + Name + "' is already defined");
}

const char *BodyStart = StartToken.getLoc().getPointer();
const char *BodyEnd = EndToken.getLoc().getPointer();
StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
checkForBadMacro(DirectiveLoc, Name, Body, Parameters);
MCAsmMacro Macro(Name, Body, std::move(Parameters));
DEBUG_WITH_TYPE("asm-macros", dbgs() << "Defining new macro:\n";do { } while (false)
                Macro.dump())do { } while (false);
getContext().defineMacro(Name, std::move(Macro));
return false;
4607}

4609/// checkForBadMacro
4610///
4611/// With the support added for named parameters there may be code out there that
4612/// is transitioning from positional parameters.  In versions of gas that did
4613/// not support named parameters they would be ignored on the macro definition.
4614/// But to support both styles of parameters this is not possible so if a macro
4615/// definition has named parameters but does not use them and has what appears
4616/// to be positional parameters, strings like $1, $2, ... and $n, then issue a
4617/// warning that the positional parameter found in body which have no effect.
4618/// Hoping the developer will either remove the named parameters from the macro
4619/// definition so the positional parameters get used if that was what was
4620/// intended or change the macro to use the named parameters.  It is possible
4621/// this warning will trigger when the none of the named parameters are used
4622/// and the strings like $1 are infact to simply to be passed trough unchanged.
4623void AsmParser::checkForBadMacro(SMLoc DirectiveLoc, StringRef Name,
                               StringRef Body,
                               ArrayRef<MCAsmMacroParameter> Parameters) {
// If this macro is not defined with named parameters the warning we are
// checking for here doesn't apply.
unsigned NParameters = Parameters.size();
if (NParameters == 0)
  return;

bool NamedParametersFound = false;
bool PositionalParametersFound = false;

// Look at the body of the macro for use of both the named parameters and what
// are likely to be positional parameters.  This is what expandMacro() is
// doing when it finds the parameters in the body.
while (!Body.empty()) {
  // Scan for the next possible parameter.
  std::size_t End = Body.size(), Pos = 0;
  for (; Pos != End; ++Pos) {
    // Check for a substitution or escape.
    // This macro is defined with parameters, look for \foo, \bar, etc.
    if (Body[Pos] == '\\' && Pos + 1 != End)
      break;

    // This macro should have parameters, but look for $0, $1, ..., $n too.
    if (Body[Pos] != '$' || Pos + 1 == End)
      continue;
    char Next = Body[Pos + 1];
    if (Next == '$' || Next == 'n' ||
        isdigit(static_cast<unsigned char>(Next)))
      break;
  }

  // Check if we reached the end.
  if (Pos == End)
    break;

  if (Body[Pos] == '$') {
    switch (Body[Pos + 1]) {
    // $$ => $
    case '$':
      break;

    // $n => number of arguments
    case 'n':
      PositionalParametersFound = true;
      break;

    // $[0-9] => argument
    default: {
      PositionalParametersFound = true;
      break;
    }
    }
    Pos += 2;
  } else {
    unsigned I = Pos + 1;
    while (isIdentifierChar(Body[I]) && I + 1 != End)
      ++I;

    const char *Begin = Body.data() + Pos + 1;
    StringRef Argument(Begin, I - (Pos + 1));
    unsigned Index = 0;
    for (; Index < NParameters; ++Index)
      if (Parameters[Index].Name == Argument)
        break;

    if (Index == NParameters) {
      if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')')
        Pos += 3;
      else {
        Pos = I;
      }
    } else {
      NamedParametersFound = true;
      Pos += 1 + Argument.size();
    }
  }
  // Update the scan point.
  Body = Body.substr(Pos);
}

if (!NamedParametersFound && PositionalParametersFound)
  Warning(DirectiveLoc, "macro defined with named parameters which are not "
                        "used in macro body, possible positional parameter "
                        "found in body which will have no effect");
4709}

4711/// parseDirectiveExitMacro
4712/// ::= .exitm
4713bool AsmParser::parseDirectiveExitMacro(StringRef Directive) {
if (parseEOL())
  return true;

if (!isInsideMacroInstantiation())
  return TokError("unexpected '" + Directive + "' in file, "
                                               "no current macro definition");

// Exit all conditionals that are active in the current macro.
while (TheCondStack.size() != ActiveMacros.back()->CondStackDepth) {
  TheCondState = TheCondStack.back();
  TheCondStack.pop_back();
}

handleMacroExit();
return false;
4729}

4731/// parseDirectiveEndMacro
4732/// ::= .endm
4733/// ::= .endmacro
4734bool AsmParser::parseDirectiveEndMacro(StringRef Directive) {
if (getLexer().isNot(AsmToken::EndOfStatement))
  return TokError("unexpected token in '" + Directive + "' directive");

// If we are inside a macro instantiation, terminate the current
// instantiation.
if (isInsideMacroInstantiation()) {
  handleMacroExit();
  return false;
}

// Otherwise, this .endmacro is a stray entry in the file; well formed
// .endmacro directives are handled during the macro definition parsing.
return TokError("unexpected '" + Directive + "' in file, "
                                             "no current macro definition");
4749}

4751/// parseDirectivePurgeMacro
4752/// ::= .purgem name
4753bool AsmParser::parseDirectivePurgeMacro(SMLoc DirectiveLoc) {
StringRef Name;
SMLoc Loc;
if (parseTokenLoc(Loc) ||
    check(parseIdentifier(Name), Loc,
          "expected identifier in '.purgem' directive") ||
    parseEOL())
  return true;

if (!getContext().lookupMacro(Name))
  return Error(DirectiveLoc, "macro '" + Name + "' is not defined");

getContext().undefineMacro(Name);
DEBUG_WITH_TYPE("asm-macros", dbgs()do { } while (false)
                                  << "Un-defining macro: " << Name << "\n")do { } while (false);
return false;
4769}

4771/// parseDirectiveBundleAlignMode
4772/// ::= {.bundle_align_mode} expression
4773bool AsmParser::parseDirectiveBundleAlignMode() {
// Expect a single argument: an expression that evaluates to a constant
// in the inclusive range 0-30.
SMLoc ExprLoc = getLexer().getLoc();
int64_t AlignSizePow2;
if (checkForValidSection() || parseAbsoluteExpression(AlignSizePow2) ||
    parseEOL() ||
    check(AlignSizePow2 < 0 || AlignSizePow2 > 30, ExprLoc,
          "invalid bundle alignment size (expected between 0 and 30)"))
  return true;

// Because of AlignSizePow2's verified range we can safely truncate it to
// unsigned.
getStreamer().emitBundleAlignMode(static_cast<unsigned>(AlignSizePow2));
return false;
4788}

4790/// parseDirectiveBundleLock
4791/// ::= {.bundle_lock} [align_to_end]
4792bool AsmParser::parseDirectiveBundleLock() {
if (checkForValidSection())
  return true;
bool AlignToEnd = false;

StringRef Option;
SMLoc Loc = getTok().getLoc();
const char *kInvalidOptionError =
    "invalid option for '.bundle_lock' directive";

if (!parseOptionalToken(AsmToken::EndOfStatement)) {
  if (check(parseIdentifier(Option), Loc, kInvalidOptionError) ||
      check(Option != "align_to_end", Loc, kInvalidOptionError) || parseEOL())
    return true;
  AlignToEnd = true;
}

getStreamer().emitBundleLock(AlignToEnd);
return false;
4811}

4813/// parseDirectiveBundleLock
4814/// ::= {.bundle_lock}
4815bool AsmParser::parseDirectiveBundleUnlock() {
if (checkForValidSection() || parseEOL())
  return true;

getStreamer().emitBundleUnlock();
return false;
4821}

4823/// parseDirectiveSpace
4824/// ::= (.skip | .space) expression [ , expression ]
4825bool AsmParser::parseDirectiveSpace(StringRef IDVal) {
SMLoc NumBytesLoc = Lexer.getLoc();
const MCExpr *NumBytes;
if (checkForValidSection() || parseExpression(NumBytes))
  return true;

int64_t FillExpr = 0;
if (parseOptionalToken(AsmToken::Comma))
  if (parseAbsoluteExpression(FillExpr))
    return true;
if (parseEOL())
  return true;

// FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0.
getStreamer().emitFill(*NumBytes, FillExpr, NumBytesLoc);

return false;
4842}

4844/// parseDirectiveDCB
4845/// ::= .dcb.{b, l, w} expression, expression
4846bool AsmParser::parseDirectiveDCB(StringRef IDVal, unsigned Size) {
SMLoc NumValuesLoc = Lexer.getLoc();
int64_t NumValues;
if (checkForValidSection() || parseAbsoluteExpression(NumValues))
  return true;

if (NumValues < 0) {
  Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect");
  return false;
}

if (parseComma())
  return true;

const MCExpr *Value;
SMLoc ExprLoc = getLexer().getLoc();
if (parseExpression(Value))
  return true;

// Special case constant expressions to match code generator.
if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
  assert(Size <= 8 && "Invalid size")((void)0);
  uint64_t IntValue = MCE->getValue();
  if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue))
    return Error(ExprLoc, "literal value out of range for directive");
  for (uint64_t i = 0, e = NumValues; i != e; ++i)
    getStreamer().emitIntValue(IntValue, Size);
} else {
  for (uint64_t i = 0, e = NumValues; i != e; ++i)
    getStreamer().emitValue(Value, Size, ExprLoc);
}

return parseEOL();
4879}

4881/// parseDirectiveRealDCB
4882/// ::= .dcb.{d, s} expression, expression
4883bool AsmParser::parseDirectiveRealDCB(StringRef IDVal, const fltSemantics &Semantics) {
SMLoc NumValuesLoc = Lexer.getLoc();
int64_t NumValues;
if (checkForValidSection() || parseAbsoluteExpression(NumValues))
  return true;

if (NumValues < 0) {
  Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect");
  return false;
}

if (parseComma())
  return true;

APInt AsInt;
if (parseRealValue(Semantics, AsInt) || parseEOL())
  return true;

for (uint64_t i = 0, e = NumValues; i != e; ++i)
  getStreamer().emitIntValue(AsInt.getLimitedValue(),
                             AsInt.getBitWidth() / 8);

return false;
4906}

4908/// parseDirectiveDS
4909/// ::= .ds.{b, d, l, p, s, w, x} expression
4910bool AsmParser::parseDirectiveDS(StringRef IDVal, unsigned Size) {
SMLoc NumValuesLoc = Lexer.getLoc();
int64_t NumValues;
if (checkForValidSection() || parseAbsoluteExpression(NumValues) ||
    parseEOL())
  return true;

if (NumValues < 0) {
  Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect");
  return false;
}

for (uint64_t i = 0, e = NumValues; i != e; ++i)
  getStreamer().emitFill(Size, 0);

return false;
4926}

4928/// parseDirectiveLEB128
4929/// ::= (.sleb128 | .uleb128) [ expression (, expression)* ]
4930bool AsmParser::parseDirectiveLEB128(bool Signed) {
if (checkForValidSection())
  return true;

auto parseOp = [&]() -> bool {
  const MCExpr *Value;
  if (parseExpression(Value))
    return true;
  if (Signed)
    getStreamer().emitSLEB128Value(Value);
  else
    getStreamer().emitULEB128Value(Value);
  return false;
};

return parseMany(parseOp);
4946}

4948/// parseDirectiveSymbolAttribute
4949///  ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ]
4950bool AsmParser::parseDirectiveSymbolAttribute(MCSymbolAttr Attr) {
auto parseOp = [&]() -> bool {
  StringRef Name;
  SMLoc Loc = getTok().getLoc();
  if (parseIdentifier(Name))
    return Error(Loc, "expected identifier");

  if (discardLTOSymbol(Name))
    return false;

  MCSymbol *Sym = getContext().getOrCreateSymbol(Name);

  // Assembler local symbols don't make any sense here. Complain loudly.
  if (Sym->isTemporary())
    return Error(Loc, "non-local symbol required");

  if (!getStreamer().emitSymbolAttribute(Sym, Attr))
    return Error(Loc, "unable to emit symbol attribute");
  return false;
};

return parseMany(parseOp);
4972}

4974/// parseDirectiveComm
4975///  ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ]
4976bool AsmParser::parseDirectiveComm(bool IsLocal) {
if (checkForValidSection())
  return true;

SMLoc IDLoc = getLexer().getLoc();
StringRef Name;
if (parseIdentifier(Name))
  return TokError("expected identifier in directive");

// Handle the identifier as the key symbol.
MCSymbol *Sym = getContext().getOrCreateSymbol(Name);

if (parseComma())
  return true;

int64_t Size;
SMLoc SizeLoc = getLexer().getLoc();
if (parseAbsoluteExpression(Size))
  return true;

int64_t Pow2Alignment = 0;
SMLoc Pow2AlignmentLoc;
if (getLexer().is(AsmToken::Comma)) {
  Lex();
  Pow2AlignmentLoc = getLexer().getLoc();
  if (parseAbsoluteExpression(Pow2Alignment))
    return true;

  LCOMM::LCOMMType LCOMM = Lexer.getMAI().getLCOMMDirectiveAlignmentType();
  if (IsLocal && LCOMM == LCOMM::NoAlignment)
    return Error(Pow2AlignmentLoc, "alignment not supported on this target");

  // If this target takes alignments in bytes (not log) validate and convert.
  if ((!IsLocal && Lexer.getMAI().getCOMMDirectiveAlignmentIsInBytes()) ||
      (IsLocal && LCOMM == LCOMM::ByteAlignment)) {
    if (!isPowerOf2_64(Pow2Alignment))
      return Error(Pow2AlignmentLoc, "alignment must be a power of 2");
    Pow2Alignment = Log2_64(Pow2Alignment);
  }
}

if (parseEOL())
  return true;

// NOTE: a size of zero for a .comm should create a undefined symbol
// but a size of .lcomm creates a bss symbol of size zero.
if (Size < 0)
  return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't "
                        "be less than zero");

// NOTE: The alignment in the directive is a power of 2 value, the assembler
// may internally end up wanting an alignment in bytes.
// FIXME: Diagnose overflow.
if (Pow2Alignment < 0)
  return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive "
                                 "alignment, can't be less than zero");

Sym->redefineIfPossible();
if (!Sym->isUndefined())
  return Error(IDLoc, "invalid symbol redefinition");

// Create the Symbol as a common or local common with Size and Pow2Alignment
if (IsLocal) {
  getStreamer().emitLocalCommonSymbol(Sym, Size, 1 << Pow2Alignment);
  return false;
}

getStreamer().emitCommonSymbol(Sym, Size, 1 << Pow2Alignment);
return false;
5045}

5047/// parseDirectiveAbort
5048///  ::= .abort [... message ...]
5049bool AsmParser::parseDirectiveAbort() {
// FIXME: Use loc from directive.
SMLoc Loc = getLexer().getLoc();

StringRef Str = parseStringToEndOfStatement();
if (parseEOL())
  return true;

if (Str.empty())
  return Error(Loc, ".abort detected. Assembly stopping.");
else
  return Error(Loc, ".abort '" + Str + "' detected. Assembly stopping.");
// FIXME: Actually abort assembly here.

return false;
5064}

5066/// parseDirectiveInclude
5067///  ::= .include "filename"
5068bool AsmParser::parseDirectiveInclude() {
// Allow the strings to have escaped octal character sequence.
std::string Filename;
SMLoc IncludeLoc = getTok().getLoc();

if (check(getTok().isNot(AsmToken::String),
          "expected string in '.include' directive") ||
    parseEscapedString(Filename) ||
    check(getTok().isNot(AsmToken::EndOfStatement),
          "unexpected token in '.include' directive") ||
    // Attempt to switch the lexer to the included file before consuming the
    // end of statement to avoid losing it when we switch.
    check(enterIncludeFile(Filename), IncludeLoc,
          "Could not find include file '" + Filename + "'"))
  return true;

return false;
5085}

5087/// parseDirectiveIncbin
5088///  ::= .incbin "filename" [ , skip [ , count ] ]
5089bool AsmParser::parseDirectiveIncbin() {
// Allow the strings to have escaped octal character sequence.
std::string Filename;
SMLoc IncbinLoc = getTok().getLoc();
if (check(getTok().isNot(AsmToken::String),
          "expected string in '.incbin' directive") ||
    parseEscapedString(Filename))
  return true;

int64_t Skip = 0;
const MCExpr *Count = nullptr;
SMLoc SkipLoc, CountLoc;
if (parseOptionalToken(AsmToken::Comma)) {
  // The skip expression can be omitted while specifying the count, e.g:
  //  .incbin "filename",,4
  if (getTok().isNot(AsmToken::Comma)) {
    if (parseTokenLoc(SkipLoc) || parseAbsoluteExpression(Skip))
      return true;
  }
  if (parseOptionalToken(AsmToken::Comma)) {
    CountLoc = getTok().getLoc();
    if (parseExpression(Count))
      return true;
  }
}

if (parseEOL())
  return true;

if (check(Skip < 0, SkipLoc, "skip is negative"))
  return true;

// Attempt to process the included file.
if (processIncbinFile(Filename, Skip, Count, CountLoc))
  return Error(IncbinLoc, "Could not find incbin file '" + Filename + "'");
return false;
5125}

5127/// parseDirectiveIf
5128/// ::= .if{,eq,ge,gt,le,lt,ne} expression
5129bool AsmParser::parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind) {
TheCondStack.push_back(TheCondState);
TheCondState.TheCond = AsmCond::IfCond;
if (TheCondState.Ignore) {
  eatToEndOfStatement();
} else {
  int64_t ExprValue;
  if (parseAbsoluteExpression(ExprValue) || parseEOL())
    return true;

  switch (DirKind) {
  default:
    llvm_unreachable("unsupported directive")__builtin_unreachable();
  case DK_IF:
  case DK_IFNE:
    break;
  case DK_IFEQ:
    ExprValue = ExprValue == 0;
    break;
  case DK_IFGE:
    ExprValue = ExprValue >= 0;
    break;
  case DK_IFGT:
    ExprValue = ExprValue > 0;
    break;
  case DK_IFLE:
    ExprValue = ExprValue <= 0;
    break;
  case DK_IFLT:
    ExprValue = ExprValue < 0;
    break;
  }

  TheCondState.CondMet = ExprValue;
  TheCondState.Ignore = !TheCondState.CondMet;
}

return false;
5167}

5169/// parseDirectiveIfb
5170/// ::= .ifb string
5171bool AsmParser::parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank) {
TheCondStack.push_back(TheCondState);
TheCondState.TheCond = AsmCond::IfCond;

if (TheCondState.Ignore) {
  eatToEndOfStatement();
} else {
  StringRef Str = parseStringToEndOfStatement();

  if (parseEOL())
    return true;

  TheCondState.CondMet = ExpectBlank == Str.empty();
  TheCondState.Ignore = !TheCondState.CondMet;
}

return false;
5188}

5190/// parseDirectiveIfc
5191/// ::= .ifc string1, string2
5192/// ::= .ifnc string1, string2
5193bool AsmParser::parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual) {
TheCondStack.push_back(TheCondState);
TheCondState.TheCond = AsmCond::IfCond;

if (TheCondState.Ignore) {
  eatToEndOfStatement();
} else {
  StringRef Str1 = parseStringToComma();

  if (parseComma())
    return true;

  StringRef Str2 = parseStringToEndOfStatement();

  if (parseEOL())
    return true;

  TheCondState.CondMet = ExpectEqual == (Str1.trim() == Str2.trim());
  TheCondState.Ignore = !TheCondState.CondMet;
}

return false;
5215}

5217/// parseDirectiveIfeqs
5218///   ::= .ifeqs string1, string2
5219bool AsmParser::parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual) {
if (Lexer.isNot(AsmToken::String)) {
  if (ExpectEqual)
    return TokError("expected string parameter for '.ifeqs' directive");
  return TokError("expected string parameter for '.ifnes' directive");
}

StringRef String1 = getTok().getStringContents();
Lex();

if (Lexer.isNot(AsmToken::Comma)) {
  if (ExpectEqual)
    return TokError(
        "expected comma after first string for '.ifeqs' directive");
  return TokError("expected comma after first string for '.ifnes' directive");
}

Lex();

if (Lexer.isNot(AsmToken::String)) {
  if (ExpectEqual)
    return TokError("expected string parameter for '.ifeqs' directive");
  return TokError("expected string parameter for '.ifnes' directive");
}

StringRef String2 = getTok().getStringContents();
Lex();

TheCondStack.push_back(TheCondState);
TheCondState.TheCond = AsmCond::IfCond;
TheCondState.CondMet = ExpectEqual == (String1 == String2);
TheCondState.Ignore = !TheCondState.CondMet;

return false;
5253}

5255/// parseDirectiveIfdef
5256/// ::= .ifdef symbol
5257bool AsmParser::parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined) {
StringRef Name;
TheCondStack.push_back(TheCondState);
TheCondState.TheCond = AsmCond::IfCond;

if (TheCondState.Ignore) {
  eatToEndOfStatement();
} else {
  if (check(parseIdentifier(Name), "expected identifier after '.ifdef'") ||
      parseEOL())
    return true;

  MCSymbol *Sym = getContext().lookupSymbol(Name);

  if (expect_defined)
    TheCondState.CondMet = (Sym && !Sym->isUndefined(false));
  else
    TheCondState.CondMet = (!Sym || Sym->isUndefined(false));
  TheCondState.Ignore = !TheCondState.CondMet;
}

return false;
5279}

5281/// parseDirectiveElseIf
5282/// ::= .elseif expression
5283bool AsmParser::parseDirectiveElseIf(SMLoc DirectiveLoc) {
if (TheCondState.TheCond != AsmCond::IfCond &&
    TheCondState.TheCond != AsmCond::ElseIfCond)
  return Error(DirectiveLoc, "Encountered a .elseif that doesn't follow an"
                             " .if or  an .elseif");
TheCondState.TheCond = AsmCond::ElseIfCond;

bool LastIgnoreState = false;
if (!TheCondStack.empty())
  LastIgnoreState = TheCondStack.back().Ignore;
if (LastIgnoreState || TheCondState.CondMet) {
  TheCondState.Ignore = true;
  eatToEndOfStatement();
} else {
  int64_t ExprValue;
  if (parseAbsoluteExpression(ExprValue))
    return true;

  if (parseEOL())
    return true;

  TheCondState.CondMet = ExprValue;
  TheCondState.Ignore = !TheCondState.CondMet;
}

return false;
5309}

5311/// parseDirectiveElse
5312/// ::= .else
5313bool AsmParser::parseDirectiveElse(SMLoc DirectiveLoc) {
if (parseEOL())
  return true;

if (TheCondState.TheCond != AsmCond::IfCond &&
    TheCondState.TheCond != AsmCond::ElseIfCond)
  return Error(DirectiveLoc, "Encountered a .else that doesn't follow "
                             " an .if or an .elseif");
TheCondState.TheCond = AsmCond::ElseCond;
bool LastIgnoreState = false;
if (!TheCondStack.empty())
  LastIgnoreState = TheCondStack.back().Ignore;
if (LastIgnoreState || TheCondState.CondMet)
  TheCondState.Ignore = true;
else
  TheCondState.Ignore = false;

return false;
5331}

5333/// parseDirectiveEnd
5334/// ::= .end
5335bool AsmParser::parseDirectiveEnd(SMLoc DirectiveLoc) {
if (parseEOL())
  return true;

while (Lexer.isNot(AsmToken::Eof))
  Lexer.Lex();

return false;
5343}

5345/// parseDirectiveError
5346///   ::= .err
5347///   ::= .error [string]
5348bool AsmParser::parseDirectiveError(SMLoc L, bool WithMessage) {
if (!TheCondStack.empty()) {
  if (TheCondStack.back().Ignore) {
    eatToEndOfStatement();
    return false;
  }
}

if (!WithMessage)
  return Error(L, ".err encountered");

StringRef Message = ".error directive invoked in source file";
if (Lexer.isNot(AsmToken::EndOfStatement)) {
  if (Lexer.isNot(AsmToken::String))
    return TokError(".error argument must be a string");

  Message = getTok().getStringContents();
  Lex();
}

return Error(L, Message);
5369}

5371/// parseDirectiveWarning
5372///   ::= .warning [string]
5373bool AsmParser::parseDirectiveWarning(SMLoc L) {
if (!TheCondStack.empty()) {
  if (TheCondStack.back().Ignore) {
    eatToEndOfStatement();
    return false;
  }
}

StringRef Message = ".warning directive invoked in source file";

if (!parseOptionalToken(AsmToken::EndOfStatement)) {
  if (Lexer.isNot(AsmToken::String))
    return TokError(".warning argument must be a string");

  Message = getTok().getStringContents();
  Lex();
  if (parseEOL())
    return true;
}

return Warning(L, Message);
5394}

5396/// parseDirectiveEndIf
5397/// ::= .endif
5398bool AsmParser::parseDirectiveEndIf(SMLoc DirectiveLoc) {
if (parseEOL())
  return true;

if ((TheCondState.TheCond == AsmCond::NoCond) || TheCondStack.empty())
  return Error(DirectiveLoc, "Encountered a .endif that doesn't follow "
                             "an .if or .else");
if (!TheCondStack.empty()) {
  TheCondState = TheCondStack.back();
  TheCondStack.pop_back();
}

return false;
5411}

5413void AsmParser::initializeDirectiveKindMap() {
/* Lookup will be done with the directive
 * converted to lower case, so all these
 * keys should be lower case.
 * (target specific directives are handled
 *  elsewhere)
 */
DirectiveKindMap[".set"] = DK_SET;
DirectiveKindMap[".equ"] = DK_EQU;
DirectiveKindMap[".equiv"] = DK_EQUIV;
DirectiveKindMap[".ascii"] = DK_ASCII;
DirectiveKindMap[".asciz"] = DK_ASCIZ;
DirectiveKindMap[".string"] = DK_STRING;
DirectiveKindMap[".byte"] = DK_BYTE;
DirectiveKindMap[".short"] = DK_SHORT;
DirectiveKindMap[".value"] = DK_VALUE;
DirectiveKindMap[".2byte"] = DK_2BYTE;
DirectiveKindMap[".long"] = DK_LONG;
DirectiveKindMap[".int"] = DK_INT;
DirectiveKindMap[".4byte"] = DK_4BYTE;
DirectiveKindMap[".quad"] = DK_QUAD;
DirectiveKindMap[".8byte"] = DK_8BYTE;
DirectiveKindMap[".octa"] = DK_OCTA;
DirectiveKindMap[".single"] = DK_SINGLE;
DirectiveKindMap[".float"] = DK_FLOAT;
DirectiveKindMap[".double"] = DK_DOUBLE;
DirectiveKindMap[".align"] = DK_ALIGN;
DirectiveKindMap[".align32"] = DK_ALIGN32;
DirectiveKindMap[".balign"] = DK_BALIGN;
DirectiveKindMap[".balignw"] = DK_BALIGNW;
DirectiveKindMap[".balignl"] = DK_BALIGNL;
DirectiveKindMap[".p2align"] = DK_P2ALIGN;
DirectiveKindMap[".p2alignw"] = DK_P2ALIGNW;
DirectiveKindMap[".p2alignl"] = DK_P2ALIGNL;
DirectiveKindMap[".org"] = DK_ORG;
DirectiveKindMap[".fill"] = DK_FILL;
DirectiveKindMap[".zero"] = DK_ZERO;
DirectiveKindMap[".extern"] = DK_EXTERN;
DirectiveKindMap[".globl"] = DK_GLOBL;
DirectiveKindMap[".global"] = DK_GLOBAL;
DirectiveKindMap[".lazy_reference"] = DK_LAZY_REFERENCE;
DirectiveKindMap[".no_dead_strip"] = DK_NO_DEAD_STRIP;
DirectiveKindMap[".symbol_resolver"] = DK_SYMBOL_RESOLVER;
DirectiveKindMap[".private_extern"] = DK_PRIVATE_EXTERN;
DirectiveKindMap[".reference"] = DK_REFERENCE;
DirectiveKindMap[".weak_definition"] = DK_WEAK_DEFINITION;
DirectiveKindMap[".weak_reference"] = DK_WEAK_REFERENCE;
DirectiveKindMap[".weak_def_can_be_hidden"] = DK_WEAK_DEF_CAN_BE_HIDDEN;
DirectiveKindMap[".cold"] = DK_COLD;
DirectiveKindMap[".comm"] = DK_COMM;
DirectiveKindMap[".common"] = DK_COMMON;
DirectiveKindMap[".lcomm"] = DK_LCOMM;
DirectiveKindMap[".abort"] = DK_ABORT;
DirectiveKindMap[".include"] = DK_INCLUDE;
DirectiveKindMap[".incbin"] = DK_INCBIN;
DirectiveKindMap[".code16"] = DK_CODE16;
DirectiveKindMap[".code16gcc"] = DK_CODE16GCC;
DirectiveKindMap[".rept"] = DK_REPT;
DirectiveKindMap[".rep"] = DK_REPT;
DirectiveKindMap[".irp"] = DK_IRP;
DirectiveKindMap[".irpc"] = DK_IRPC;
DirectiveKindMap[".endr"] = DK_ENDR;
DirectiveKindMap[".bundle_align_mode"] = DK_BUNDLE_ALIGN_MODE;
DirectiveKindMap[".bundle_lock"] = DK_BUNDLE_LOCK;
DirectiveKindMap[".bundle_unlock"] = DK_BUNDLE_UNLOCK;
DirectiveKindMap[".if"] = DK_IF;
DirectiveKindMap[".ifeq"] = DK_IFEQ;
DirectiveKindMap[".ifge"] = DK_IFGE;
DirectiveKindMap[".ifgt"] = DK_IFGT;
DirectiveKindMap[".ifle"] = DK_IFLE;
DirectiveKindMap[".iflt"] = DK_IFLT;
DirectiveKindMap[".ifne"] = DK_IFNE;
DirectiveKindMap[".ifb"] = DK_IFB;
DirectiveKindMap[".ifnb"] = DK_IFNB;
DirectiveKindMap[".ifc"] = DK_IFC;
DirectiveKindMap[".ifeqs"] = DK_IFEQS;
DirectiveKindMap[".ifnc"] = DK_IFNC;
DirectiveKindMap[".ifnes"] = DK_IFNES;
DirectiveKindMap[".ifdef"] = DK_IFDEF;
DirectiveKindMap[".ifndef"] = DK_IFNDEF;
DirectiveKindMap[".ifnotdef"] = DK_IFNOTDEF;
DirectiveKindMap[".elseif"] = DK_ELSEIF;
DirectiveKindMap[".else"] = DK_ELSE;
DirectiveKindMap[".end"] = DK_END;
DirectiveKindMap[".endif"] = DK_ENDIF;
DirectiveKindMap[".skip"] = DK_SKIP;
DirectiveKindMap[".space"] = DK_SPACE;
DirectiveKindMap[".file"] = DK_FILE;
DirectiveKindMap[".line"] = DK_LINE;
DirectiveKindMap[".loc"] = DK_LOC;
DirectiveKindMap[".stabs"] = DK_STABS;
DirectiveKindMap[".cv_file"] = DK_CV_FILE;
DirectiveKindMap[".cv_func_id"] = DK_CV_FUNC_ID;
DirectiveKindMap[".cv_loc"] = DK_CV_LOC;
DirectiveKindMap[".cv_linetable"] = DK_CV_LINETABLE;
DirectiveKindMap[".cv_inline_linetable"] = DK_CV_INLINE_LINETABLE;
DirectiveKindMap[".cv_inline_site_id"] = DK_CV_INLINE_SITE_ID;
DirectiveKindMap[".cv_def_range"] = DK_CV_DEF_RANGE;
DirectiveKindMap[".cv_string"] = DK_CV_STRING;
DirectiveKindMap[".cv_stringtable"] = DK_CV_STRINGTABLE;
DirectiveKindMap[".cv_filechecksums"] = DK_CV_FILECHECKSUMS;
DirectiveKindMap[".cv_filechecksumoffset"] = DK_CV_FILECHECKSUM_OFFSET;
DirectiveKindMap[".cv_fpo_data"] = DK_CV_FPO_DATA;
DirectiveKindMap[".sleb128"] = DK_SLEB128;
DirectiveKindMap[".uleb128"] = DK_ULEB128;
DirectiveKindMap[".cfi_sections"] = DK_CFI_SECTIONS;
DirectiveKindMap[".cfi_startproc"] = DK_CFI_STARTPROC;
DirectiveKindMap[".cfi_endproc"] = DK_CFI_ENDPROC;
DirectiveKindMap[".cfi_def_cfa"] = DK_CFI_DEF_CFA;
DirectiveKindMap[".cfi_def_cfa_offset"] = DK_CFI_DEF_CFA_OFFSET;
DirectiveKindMap[".cfi_adjust_cfa_offset"] = DK_CFI_ADJUST_CFA_OFFSET;
DirectiveKindMap[".cfi_def_cfa_register"] = DK_CFI_DEF_CFA_REGISTER;
DirectiveKindMap[".cfi_llvm_def_aspace_cfa"] = DK_CFI_LLVM_DEF_ASPACE_CFA;
DirectiveKindMap[".cfi_offset"] = DK_CFI_OFFSET;
DirectiveKindMap[".cfi_rel_offset"] = DK_CFI_REL_OFFSET;
DirectiveKindMap[".cfi_personality"] = DK_CFI_PERSONALITY;
DirectiveKindMap[".cfi_lsda"] = DK_CFI_LSDA;
DirectiveKindMap[".cfi_remember_state"] = DK_CFI_REMEMBER_STATE;
DirectiveKindMap[".cfi_restore_state"] = DK_CFI_RESTORE_STATE;
DirectiveKindMap[".cfi_same_value"] = DK_CFI_SAME_VALUE;
DirectiveKindMap[".cfi_restore"] = DK_CFI_RESTORE;
DirectiveKindMap[".cfi_escape"] = DK_CFI_ESCAPE;
DirectiveKindMap[".cfi_return_column"] = DK_CFI_RETURN_COLUMN;
DirectiveKindMap[".cfi_signal_frame"] = DK_CFI_SIGNAL_FRAME;
DirectiveKindMap[".cfi_undefined"] = DK_CFI_UNDEFINED;
DirectiveKindMap[".cfi_register"] = DK_CFI_REGISTER;
DirectiveKindMap[".cfi_window_save"] = DK_CFI_WINDOW_SAVE;
DirectiveKindMap[".cfi_b_key_frame"] = DK_CFI_B_KEY_FRAME;
DirectiveKindMap[".macros_on"] = DK_MACROS_ON;
DirectiveKindMap[".macros_off"] = DK_MACROS_OFF;
DirectiveKindMap[".macro"] = DK_MACRO;
DirectiveKindMap[".exitm"] = DK_EXITM;
DirectiveKindMap[".endm"] = DK_ENDM;
DirectiveKindMap[".endmacro"] = DK_ENDMACRO;
DirectiveKindMap[".purgem"] = DK_PURGEM;
DirectiveKindMap[".err"] = DK_ERR;
DirectiveKindMap[".error"] = DK_ERROR;
DirectiveKindMap[".warning"] = DK_WARNING;
DirectiveKindMap[".altmacro"] = DK_ALTMACRO;
DirectiveKindMap[".noaltmacro"] = DK_NOALTMACRO;
DirectiveKindMap[".reloc"] = DK_RELOC;
DirectiveKindMap[".dc"] = DK_DC;
DirectiveKindMap[".dc.a"] = DK_DC_A;
DirectiveKindMap[".dc.b"] = DK_DC_B;
DirectiveKindMap[".dc.d"] = DK_DC_D;
DirectiveKindMap[".dc.l"] = DK_DC_L;
DirectiveKindMap[".dc.s"] = DK_DC_S;
DirectiveKindMap[".dc.w"] = DK_DC_W;
DirectiveKindMap[".dc.x"] = DK_DC_X;
DirectiveKindMap[".dcb"] = DK_DCB;
DirectiveKindMap[".dcb.b"] = DK_DCB_B;
DirectiveKindMap[".dcb.d"] = DK_DCB_D;
DirectiveKindMap[".dcb.l"] = DK_DCB_L;
DirectiveKindMap[".dcb.s"] = DK_DCB_S;
DirectiveKindMap[".dcb.w"] = DK_DCB_W;
DirectiveKindMap[".dcb.x"] = DK_DCB_X;
DirectiveKindMap[".ds"] = DK_DS;
DirectiveKindMap[".ds.b"] = DK_DS_B;
DirectiveKindMap[".ds.d"] = DK_DS_D;
DirectiveKindMap[".ds.l"] = DK_DS_L;
DirectiveKindMap[".ds.p"] = DK_DS_P;
DirectiveKindMap[".ds.s"] = DK_DS_S;
DirectiveKindMap[".ds.w"] = DK_DS_W;
DirectiveKindMap[".ds.x"] = DK_DS_X;
DirectiveKindMap[".print"] = DK_PRINT;
DirectiveKindMap[".addrsig"] = DK_ADDRSIG;
DirectiveKindMap[".addrsig_sym"] = DK_ADDRSIG_SYM;
DirectiveKindMap[".pseudoprobe"] = DK_PSEUDO_PROBE;
DirectiveKindMap[".lto_discard"] = DK_LTO_DISCARD;
5582}

5584MCAsmMacro *AsmParser::parseMacroLikeBody(SMLoc DirectiveLoc) {
AsmToken EndToken, StartToken = getTok();

unsigned NestLevel = 0;
while (true) {
  // Check whether we have reached the end of the file.
  if (getLexer().is(AsmToken::Eof)) {
    printError(DirectiveLoc, "no matching '.endr' in definition");
    return nullptr;
  }

  if (Lexer.is(AsmToken::Identifier) &&
      (getTok().getIdentifier() == ".rep" ||
       getTok().getIdentifier() == ".rept" ||
       getTok().getIdentifier() == ".irp" ||
       getTok().getIdentifier() == ".irpc")) {
    ++NestLevel;
  }

  // Otherwise, check whether we have reached the .endr.
  if (Lexer.is(AsmToken::Identifier) && getTok().getIdentifier() == ".endr") {
    if (NestLevel == 0) {
      EndToken = getTok();
      Lex();
      if (Lexer.isNot(AsmToken::EndOfStatement)) {
        printError(getTok().getLoc(),
                   "unexpected token in '.endr' directive");
        return nullptr;
      }
      break;
    }
    --NestLevel;
  }

  // Otherwise, scan till the end of the statement.
  eatToEndOfStatement();
}

const char *BodyStart = StartToken.getLoc().getPointer();
const char *BodyEnd = EndToken.getLoc().getPointer();
StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);

// We Are Anonymous.
MacroLikeBodies.emplace_back(StringRef(), Body, MCAsmMacroParameters());
return &MacroLikeBodies.back();
5629}

5631void AsmParser::instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
                                       raw_svector_ostream &OS) {
OS << ".endr\n";

std::unique_ptr<MemoryBuffer> Instantiation =
    MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");

// Create the macro instantiation object and add to the current macro
// instantiation stack.
MacroInstantiation *MI = new MacroInstantiation{
    DirectiveLoc, CurBuffer, getTok().getLoc(), TheCondStack.size()};
ActiveMacros.push_back(MI);

// Jump to the macro instantiation and prime the lexer.
CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc());
Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
Lex();
5648}

5650/// parseDirectiveRept
5651///   ::= .rep | .rept count
5652bool AsmParser::parseDirectiveRept(SMLoc DirectiveLoc, StringRef Dir) {
const MCExpr *CountExpr;
SMLoc CountLoc = getTok().getLoc();
if (parseExpression(CountExpr))
  return true;

int64_t Count;
if (!CountExpr->evaluateAsAbsolute(Count, getStreamer().getAssemblerPtr())) {
  return Error(CountLoc, "unexpected token in '" + Dir + "' directive");
}

if (check(Count < 0, CountLoc, "Count is negative") || parseEOL())
  return true;

// Lex the rept definition.
MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
if (!M)
  return true;

// Macro instantiation is lexical, unfortunately. We construct a new buffer
// to hold the macro body with substitutions.
SmallString<256> Buf;
raw_svector_ostream OS(Buf);
while (Count--) {
  // Note that the AtPseudoVariable is disabled for instantiations of .rep(t).
  if (expandMacro(OS, M->Body, None, None, false, getTok().getLoc()))
    return true;
}
instantiateMacroLikeBody(M, DirectiveLoc, OS);

return false;
5683}

5685/// parseDirectiveIrp
5686/// ::= .irp symbol,values
5687bool AsmParser::parseDirectiveIrp(SMLoc DirectiveLoc) {
MCAsmMacroParameter Parameter;
MCAsmMacroArguments A;
if (check(parseIdentifier(Parameter.Name),
          "expected identifier in '.irp' directive") ||
    parseComma() || parseMacroArguments(nullptr, A) || parseEOL())
  return true;

// Lex the irp definition.
MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
if (!M)
  return true;

// Macro instantiation is lexical, unfortunately. We construct a new buffer
// to hold the macro body with substitutions.
SmallString<256> Buf;
raw_svector_ostream OS(Buf);

for (const MCAsmMacroArgument &Arg : A) {
  // Note that the AtPseudoVariable is enabled for instantiations of .irp.
  // This is undocumented, but GAS seems to support it.
  if (expandMacro(OS, M->Body, Parameter, Arg, true, getTok().getLoc()))
    return true;
}

instantiateMacroLikeBody(M, DirectiveLoc, OS);

return false;
5715}

5717/// parseDirectiveIrpc
5718/// ::= .irpc symbol,values
5719bool AsmParser::parseDirectiveIrpc(SMLoc DirectiveLoc) {
MCAsmMacroParameter Parameter;
MCAsmMacroArguments A;

if (check(parseIdentifier(Parameter.Name),
          "expected identifier in '.irpc' directive") ||
    parseComma() || parseMacroArguments(nullptr, A))
  return true;

if (A.size() != 1 || A.front().size() != 1)
  return TokError("unexpected token in '.irpc' directive");
if (parseEOL())
  return true;

// Lex the irpc definition.
MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
if (!M)
  return true;

// Macro instantiation is lexical, unfortunately. We construct a new buffer
// to hold the macro body with substitutions.
SmallString<256> Buf;
raw_svector_ostream OS(Buf);

StringRef Values = A.front().front().getString();
for (std::size_t I = 0, End = Values.size(); I != End; ++I) {
  MCAsmMacroArgument Arg;
  Arg.emplace_back(AsmToken::Identifier, Values.slice(I, I + 1));

  // Note that the AtPseudoVariable is enabled for instantiations of .irpc.
  // This is undocumented, but GAS seems to support it.
  if (expandMacro(OS, M->Body, Parameter, Arg, true, getTok().getLoc()))
    return true;
}

instantiateMacroLikeBody(M, DirectiveLoc, OS);

return false;
5757}

5759bool AsmParser::parseDirectiveEndr(SMLoc DirectiveLoc) {
if (ActiveMacros.empty())
  return TokError("unmatched '.endr' directive");

// The only .repl that should get here are the ones created by
// instantiateMacroLikeBody.
assert(getLexer().is(AsmToken::EndOfStatement))((void)0);

handleMacroExit();
return false;
5769}

5771bool AsmParser::parseDirectiveMSEmit(SMLoc IDLoc, ParseStatementInfo &Info,
                                   size_t Len) {
const MCExpr *Value;
SMLoc ExprLoc = getLexer().getLoc();
if (parseExpression(Value))
  return true;
const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
if (!MCE)
  return Error(ExprLoc, "unexpected expression in _emit");
uint64_t IntValue = MCE->getValue();
if (!isUInt<8>(IntValue) && !isInt<8>(IntValue))
  return Error(ExprLoc, "literal value out of range for directive");

Info.AsmRewrites->emplace_back(AOK_Emit, IDLoc, Len);
return false;
5786}

5788bool AsmParser::parseDirectiveMSAlign(SMLoc IDLoc, ParseStatementInfo &Info) {
const MCExpr *Value;
SMLoc ExprLoc = getLexer().getLoc();
if (parseExpression(Value))
  return true;
const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
if (!MCE)
  return Error(ExprLoc, "unexpected expression in align");
uint64_t IntValue = MCE->getValue();
if (!isPowerOf2_64(IntValue))
  return Error(ExprLoc, "literal value not a power of two greater then zero");

Info.AsmRewrites->emplace_back(AOK_Align, IDLoc, 5, Log2_64(IntValue));
return false;
5802}

5804bool AsmParser::parseDirectivePrint(SMLoc DirectiveLoc) {
const AsmToken StrTok = getTok();
Lex();
if (StrTok.isNot(AsmToken::String) || StrTok.getString().front() != '"')
  return Error(DirectiveLoc, "expected double quoted string after .print");
if (parseEOL())
  return true;
llvm::outs() << StrTok.getStringContents() << '\n';
return false;
5813}

5815bool AsmParser::parseDirectiveAddrsig() {
if (parseEOL())
  return true;
getStreamer().emitAddrsig();
return false;
5820}

5822bool AsmParser::parseDirectiveAddrsigSym() {
StringRef Name;
if (check(parseIdentifier(Name), "expected identifier") || parseEOL())
  return true;
MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
getStreamer().emitAddrsigSym(Sym);
return false;
5829}

5831bool AsmParser::parseDirectivePseudoProbe() {
int64_t Guid;
29
←
'Guid' declared without an initial value→
int64_t Index;
int64_t Type;
int64_t Attr;

if (getLexer().is(AsmToken::Integer)) {
30
←
Calling 'MCAsmLexer::is'→
36
←
Returning from 'MCAsmLexer::is'→
37
←
Taking false branch→
  if (parseIntToken(Guid, "unexpected token in '.pseudoprobe' directive"))
    return true;
}

if (getLexer().is(AsmToken::Integer)) {
38
←
Calling 'MCAsmLexer::is'→
44
←
Returning from 'MCAsmLexer::is'→
45
←
Taking false branch→
  if (parseIntToken(Index, "unexpected token in '.pseudoprobe' directive"))
    return true;
}

if (getLexer().is(AsmToken::Integer)) {
46
←
Calling 'MCAsmLexer::is'→
52
←
Returning from 'MCAsmLexer::is'→
53
←
Taking false branch→
  if (parseIntToken(Type, "unexpected token in '.pseudoprobe' directive"))
    return true;
}

if (getLexer().is(AsmToken::Integer)) {
54
←
Calling 'MCAsmLexer::is'→
60
←
Returning from 'MCAsmLexer::is'→
61
←
Taking false branch→
  if (parseIntToken(Attr, "unexpected token in '.pseudoprobe' directive"))
    return true;
}

// Parse inline stack like @ GUID:11:12 @ GUID:1:11 @ GUID:3:21
MCPseudoProbeInlineStack InlineStack;

while (getLexer().is(AsmToken::At)) {
62
←
Calling 'MCAsmLexer::is'→
68
←
Returning from 'MCAsmLexer::is'→
69
←
Loop condition is false. Execution continues on line 5886→
  // eat @
  Lex();

  int64_t CallerGuid = 0;
  if (getLexer().is(AsmToken::Integer)) {
    if (parseIntToken(CallerGuid,
                      "unexpected token in '.pseudoprobe' directive"))
      return true;
  }

  // eat colon
  if (getLexer().is(AsmToken::Colon))
    Lex();

  int64_t CallerProbeId = 0;
  if (getLexer().is(AsmToken::Integer)) {
    if (parseIntToken(CallerProbeId,
                      "unexpected token in '.pseudoprobe' directive"))
      return true;
  }

  InlineSite Site(CallerGuid, CallerProbeId);
  InlineStack.push_back(Site);
}

if (parseEOL())
70
←
Assuming the condition is false→
71
←
Taking false branch→
  return true;

getStreamer().emitPseudoProbe(Guid, Index, Type, Attr, InlineStack);
72
←
1st function call argument is an uninitialized value
return false;
5891}

5893/// parseDirectiveLTODiscard
5894///  ::= ".lto_discard" [ identifier ( , identifier )* ]
5895/// The LTO library emits this directive to discard non-prevailing symbols.
5896/// We ignore symbol assignments and attribute changes for the specified
5897/// symbols.
5898bool AsmParser::parseDirectiveLTODiscard() {
auto ParseOp = [&]() -> bool {
  StringRef Name;
  SMLoc Loc = getTok().getLoc();
  if (parseIdentifier(Name))
    return Error(Loc, "expected identifier");
  LTODiscardSymbols.insert(Name);
  return false;
};

LTODiscardSymbols.clear();
return parseMany(ParseOp);
5910}

5912// We are comparing pointers, but the pointers are relative to a single string.
5913// Thus, this should always be deterministic.
5914static int rewritesSort(const AsmRewrite *AsmRewriteA,
                      const AsmRewrite *AsmRewriteB) {
if (AsmRewriteA->Loc.getPointer() < AsmRewriteB->Loc.getPointer())
  return -1;
if (AsmRewriteB->Loc.getPointer() < AsmRewriteA->Loc.getPointer())
  return 1;

// It's possible to have a SizeDirective, Imm/ImmPrefix and an Input/Output
// rewrite to the same location.  Make sure the SizeDirective rewrite is
// performed first, then the Imm/ImmPrefix and finally the Input/Output.  This
// ensures the sort algorithm is stable.
if (AsmRewritePrecedence[AsmRewriteA->Kind] >
    AsmRewritePrecedence[AsmRewriteB->Kind])
  return -1;

if (AsmRewritePrecedence[AsmRewriteA->Kind] <
    AsmRewritePrecedence[AsmRewriteB->Kind])
  return 1;
llvm_unreachable("Unstable rewrite sort.")__builtin_unreachable();
5933}

5935bool AsmParser::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,
  const MCInstPrinter *IP, MCAsmParserSemaCallback &SI) {
SmallVector<void *, 4> InputDecls;
SmallVector<void *, 4> OutputDecls;
SmallVector<bool, 4> InputDeclsAddressOf;
SmallVector<bool, 4> OutputDeclsAddressOf;
SmallVector<std::string, 4> InputConstraints;
SmallVector<std::string, 4> OutputConstraints;
SmallVector<unsigned, 4> ClobberRegs;

SmallVector<AsmRewrite, 4> AsmStrRewrites;

// Prime the lexer.
Lex();

// While we have input, parse each statement.
unsigned InputIdx = 0;
unsigned OutputIdx = 0;
while (getLexer().isNot(AsmToken::Eof)) {
  // Parse curly braces marking block start/end
  if (parseCurlyBlockScope(AsmStrRewrites))
    continue;

  ParseStatementInfo Info(&AsmStrRewrites);
  bool StatementErr = parseStatement(Info, &SI);

  if (StatementErr || Info.ParseError) {
    // Emit pending errors if any exist.
    printPendingErrors();
    return true;
  }

  // No pending error should exist here.
  assert(!hasPendingError() && "unexpected error from parseStatement")((void)0);

  if (Info.Opcode == ~0U)
    continue;

  const MCInstrDesc &Desc = MII->get(Info.Opcode);

  // Build the list of clobbers, outputs and inputs.
  for (unsigned i = 1, e = Info.ParsedOperands.size(); i != e; ++i) {
    MCParsedAsmOperand &Operand = *Info.ParsedOperands[i];

    // Register operand.
    if (Operand.isReg() && !Operand.needAddressOf() &&
        !getTargetParser().OmitRegisterFromClobberLists(Operand.getReg())) {
      unsigned NumDefs = Desc.getNumDefs();
      // Clobber.
      if (NumDefs && Operand.getMCOperandNum() < NumDefs)
        ClobberRegs.push_back(Operand.getReg());
      continue;
    }

    // Expr/Input or Output.
    StringRef SymName = Operand.getSymName();
    if (SymName.empty())
      continue;

    void *OpDecl = Operand.getOpDecl();
    if (!OpDecl)
      continue;

    StringRef Constraint = Operand.getConstraint();
    if (Operand.isImm()) {
      // Offset as immediate
      if (Operand.isOffsetOfLocal())
        Constraint = "r";
      else
        Constraint = "i";
    }

    bool isOutput = (i == 1) && Desc.mayStore();
    SMLoc Start = SMLoc::getFromPointer(SymName.data());
    if (isOutput) {
      ++InputIdx;
      OutputDecls.push_back(OpDecl);
      OutputDeclsAddressOf.push_back(Operand.needAddressOf());
      OutputConstraints.push_back(("=" + Constraint).str());
      AsmStrRewrites.emplace_back(AOK_Output, Start, SymName.size());
    } else {
      InputDecls.push_back(OpDecl);
      InputDeclsAddressOf.push_back(Operand.needAddressOf());
      InputConstraints.push_back(Constraint.str());
      if (Desc.OpInfo[i - 1].isBranchTarget())
        AsmStrRewrites.emplace_back(AOK_CallInput, Start, SymName.size());
      else
        AsmStrRewrites.emplace_back(AOK_Input, Start, SymName.size());
    }
  }

  // Consider implicit defs to be clobbers.  Think of cpuid and push.
  ArrayRef<MCPhysReg> ImpDefs(Desc.getImplicitDefs(),
                              Desc.getNumImplicitDefs());
  llvm::append_range(ClobberRegs, ImpDefs);
}

// Set the number of Outputs and Inputs.
NumOutputs = OutputDecls.size();
NumInputs = InputDecls.size();

// Set the unique clobbers.
array_pod_sort(ClobberRegs.begin(), ClobberRegs.end());
ClobberRegs.erase(std::unique(ClobberRegs.begin(), ClobberRegs.end()),
                  ClobberRegs.end());
Clobbers.assign(ClobberRegs.size(), std::string());
for (unsigned I = 0, E = ClobberRegs.size(); I != E; ++I) {
  raw_string_ostream OS(Clobbers[I]);
  IP->printRegName(OS, ClobberRegs[I]);
}

// Merge the various outputs and inputs.  Output are expected first.
if (NumOutputs || NumInputs) {
  unsigned NumExprs = NumOutputs + NumInputs;
  OpDecls.resize(NumExprs);
  Constraints.resize(NumExprs);
  for (unsigned i = 0; i < NumOutputs; ++i) {
    OpDecls[i] = std::make_pair(OutputDecls[i], OutputDeclsAddressOf[i]);
    Constraints[i] = OutputConstraints[i];
  }
  for (unsigned i = 0, j = NumOutputs; i < NumInputs; ++i, ++j) {
    OpDecls[j] = std::make_pair(InputDecls[i], InputDeclsAddressOf[i]);
    Constraints[j] = InputConstraints[i];
  }
}

// Build the IR assembly string.
std::string AsmStringIR;
raw_string_ostream OS(AsmStringIR);
StringRef ASMString =
    SrcMgr.getMemoryBuffer(SrcMgr.getMainFileID())->getBuffer();
const char *AsmStart = ASMString.begin();
const char *AsmEnd = ASMString.end();
array_pod_sort(AsmStrRewrites.begin(), AsmStrRewrites.end(), rewritesSort);
for (auto it = AsmStrRewrites.begin(); it != AsmStrRewrites.end(); ++it) {
  const AsmRewrite &AR = *it;
  // Check if this has already been covered by another rewrite...
  if (AR.Done)
    continue;
  AsmRewriteKind Kind = AR.Kind;

  const char *Loc = AR.Loc.getPointer();
  assert(Loc >= AsmStart && "Expected Loc to be at or after Start!")((void)0);

  // Emit everything up to the immediate/expression.
  if (unsigned Len = Loc - AsmStart)
    OS << StringRef(AsmStart, Len);

  // Skip the original expression.
  if (Kind == AOK_Skip) {
    AsmStart = Loc + AR.Len;
    continue;
  }

  unsigned AdditionalSkip = 0;
  // Rewrite expressions in $N notation.
  switch (Kind) {
  default:
    break;
  case AOK_IntelExpr:
    assert(AR.IntelExp.isValid() && "cannot write invalid intel expression")((void)0);
    if (AR.IntelExp.NeedBracs)
      OS << "[";
    if (AR.IntelExp.hasBaseReg())
      OS << AR.IntelExp.BaseReg;
    if (AR.IntelExp.hasIndexReg())
      OS << (AR.IntelExp.hasBaseReg() ? " + " : "")
         << AR.IntelExp.IndexReg;
    if (AR.IntelExp.Scale > 1)
      OS << " * $$" << AR.IntelExp.Scale;
    if (AR.IntelExp.hasOffset()) {
      if (AR.IntelExp.hasRegs())
        OS << " + ";
      // Fuse this rewrite with a rewrite of the offset name, if present.
      StringRef OffsetName = AR.IntelExp.OffsetName;
      SMLoc OffsetLoc = SMLoc::getFromPointer(AR.IntelExp.OffsetName.data());
      size_t OffsetLen = OffsetName.size();
      auto rewrite_it = std::find_if(
          it, AsmStrRewrites.end(), [&](const AsmRewrite &FusingAR) {
            return FusingAR.Loc == OffsetLoc && FusingAR.Len == OffsetLen &&
                   (FusingAR.Kind == AOK_Input ||
                    FusingAR.Kind == AOK_CallInput);
          });
      if (rewrite_it == AsmStrRewrites.end()) {
        OS << "offset " << OffsetName;
      } else if (rewrite_it->Kind == AOK_CallInput) {
        OS << "${" << InputIdx++ << ":P}";
        rewrite_it->Done = true;
      } else {
        OS << '$' << InputIdx++;
        rewrite_it->Done = true;
      }
    }
    if (AR.IntelExp.Imm || AR.IntelExp.emitImm())
      OS << (AR.IntelExp.emitImm() ? "$$" : " + $$") << AR.IntelExp.Imm;
    if (AR.IntelExp.NeedBracs)
      OS << "]";
    break;
  case AOK_Label:
    OS << Ctx.getAsmInfo()->getPrivateLabelPrefix() << AR.Label;
    break;
  case AOK_Input:
    OS << '$' << InputIdx++;
    break;
  case AOK_CallInput:
    OS << "${" << InputIdx++ << ":P}";
    break;
  case AOK_Output:
    OS << '$' << OutputIdx++;
    break;
  case AOK_SizeDirective:
    switch (AR.Val) {
    default: break;
    case 8:  OS << "byte ptr "; break;
    case 16: OS << "word ptr "; break;
    case 32: OS << "dword ptr "; break;
    case 64: OS << "qword ptr "; break;
    case 80: OS << "xword ptr "; break;
    case 128: OS << "xmmword ptr "; break;
    case 256: OS << "ymmword ptr "; break;
    }
    break;
  case AOK_Emit:
    OS << ".byte";
    break;
  case AOK_Align: {
    // MS alignment directives are measured in bytes. If the native assembler
    // measures alignment in bytes, we can pass it straight through.
    OS << ".align";
    if (getContext().getAsmInfo()->getAlignmentIsInBytes())
      break;

    // Alignment is in log2 form, so print that instead and skip the original
    // immediate.
    unsigned Val = AR.Val;
    OS << ' ' << Val;
    assert(Val < 10 && "Expected alignment less then 2^10.")((void)0);
    AdditionalSkip = (Val < 4) ? 2 : Val < 7 ? 3 : 4;
    break;
  }
  case AOK_EVEN:
    OS << ".even";
    break;
  case AOK_EndOfStatement:
    OS << "\n\t";
    break;
  }

  // Skip the original expression.
  AsmStart = Loc + AR.Len + AdditionalSkip;
}

// Emit the remainder of the asm string.
if (AsmStart != AsmEnd)
  OS << StringRef(AsmStart, AsmEnd - AsmStart);

AsmString = OS.str();
return false;
6197}

6199bool HLASMAsmParser::parseAsHLASMLabel(ParseStatementInfo &Info,
                                     MCAsmParserSemaCallback *SI) {
AsmToken LabelTok = getTok();
SMLoc LabelLoc = LabelTok.getLoc();
StringRef LabelVal;

if (parseIdentifier(LabelVal))
  return Error(LabelLoc, "The HLASM Label has to be an Identifier");

// We have validated whether the token is an Identifier.
// Now we have to validate whether the token is a
// valid HLASM Label.
if (!getTargetParser().isLabel(LabelTok) || checkForValidSection())
  return true;

// Lex leading spaces to get to the next operand.
lexLeadingSpaces();

// We shouldn't emit the label if there is nothing else after the label.
// i.e asm("<token>\n")
if (getTok().is(AsmToken::EndOfStatement))
  return Error(LabelLoc,
               "Cannot have just a label for an HLASM inline asm statement");

MCSymbol *Sym = getContext().getOrCreateSymbol(
    getContext().getAsmInfo()->shouldEmitLabelsInUpperCase()
        ? LabelVal.upper()
        : LabelVal);

getTargetParser().doBeforeLabelEmit(Sym);

// Emit the label.
Out.emitLabel(Sym, LabelLoc);

// 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(),
                             LabelLoc);

getTargetParser().onLabelParsed(Sym);

return false;
6242}

6244bool HLASMAsmParser::parseAsMachineInstruction(ParseStatementInfo &Info,
                                             MCAsmParserSemaCallback *SI) {
AsmToken OperationEntryTok = Lexer.getTok();
SMLoc OperationEntryLoc = OperationEntryTok.getLoc();
StringRef OperationEntryVal;

// Attempt to parse the first token as an Identifier
if (parseIdentifier(OperationEntryVal))
  return Error(OperationEntryLoc, "unexpected token at start of statement");

// Once we've parsed the operation entry successfully, lex
// any spaces to get to the OperandEntries.
lexLeadingSpaces();

return parseAndMatchAndEmitTargetInstruction(
    Info, OperationEntryVal, OperationEntryTok, OperationEntryLoc);
6260}

6262bool HLASMAsmParser::parseStatement(ParseStatementInfo &Info,
                                  MCAsmParserSemaCallback *SI) {
assert(!hasPendingError() && "parseStatement started with pending error")((void)0);

// Should the first token be interpreted as a HLASM Label.
bool ShouldParseAsHLASMLabel = false;

// If a Name Entry exists, it should occur at the very
// start of the string. In this case, we should parse the
// first non-space token as a Label.
// If the Name entry is missing (i.e. there's some other
// token), then we attempt to parse the first non-space
// token as a Machine Instruction.
if (getTok().isNot(AsmToken::Space))
  ShouldParseAsHLASMLabel = true;

// If we have an EndOfStatement (which includes the target's comment
// string) we can appropriately lex it early on)
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;
}

// We have established how to parse the inline asm statement.
// Now we can safely lex any leading spaces to get to the
// first token.
lexLeadingSpaces();

// If we see a new line or carriage return as the first operand,
// after lexing leading spaces, emit the new line and lex the
// EndOfStatement token.
if (Lexer.is(AsmToken::EndOfStatement)) {
  if (getTok().getString().front() == '\n' ||
      getTok().getString().front() == '\r') {
    Out.AddBlankLine();
    Lex();
    return false;
  }
}

// Handle the label first if we have to before processing the rest
// of the tokens as a machine instruction.
if (ShouldParseAsHLASMLabel) {
  // If there were any errors while handling and emitting the label,
  // early return.
  if (parseAsHLASMLabel(Info, SI)) {
    // If we know we've failed in parsing, simply eat until end of the
    // statement. This ensures that we don't process any other statements.
    eatToEndOfStatement();
    return true;
  }
}

return parseAsMachineInstruction(Info, SI);
6320}

6322namespace llvm {
6323namespace MCParserUtils {

6325/// Returns whether the given symbol is used anywhere in the given expression,
6326/// or subexpressions.
6327static bool isSymbolUsedInExpression(const MCSymbol *Sym, const MCExpr *Value) {
switch (Value->getKind()) {
case MCExpr::Binary: {
  const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(Value);
  return isSymbolUsedInExpression(Sym, BE->getLHS()) ||
         isSymbolUsedInExpression(Sym, BE->getRHS());
}
case MCExpr::Target:
case MCExpr::Constant:
  return false;
case MCExpr::SymbolRef: {
  const MCSymbol &S =
      static_cast<const MCSymbolRefExpr *>(Value)->getSymbol();
  if (S.isVariable())
    return isSymbolUsedInExpression(Sym, S.getVariableValue());
  return &S == Sym;
}
case MCExpr::Unary:
  return isSymbolUsedInExpression(
      Sym, static_cast<const MCUnaryExpr *>(Value)->getSubExpr());
}

llvm_unreachable("Unknown expr kind!")__builtin_unreachable();
6350}

6352bool parseAssignmentExpression(StringRef Name, bool allow_redef,
                             MCAsmParser &Parser, MCSymbol *&Sym,
                             const MCExpr *&Value) {

// FIXME: Use better location, we should use proper tokens.
SMLoc EqualLoc = Parser.getTok().getLoc();
if (Parser.parseExpression(Value))
  return Parser.TokError("missing expression");

// Note: we don't count b as used in "a = b". This is to allow
// a = b
// b = c

if (Parser.parseEOL())
  return true;

// Validate that the LHS is allowed to be a variable (either it has not been
// used as a symbol, or it is an absolute symbol).
Sym = Parser.getContext().lookupSymbol(Name);
if (Sym) {
  // Diagnose assignment to a label.
  //
  // FIXME: Diagnostics. Note the location of the definition as a label.
  // FIXME: Diagnose assignment to protected identifier (e.g., register name).
  if (isSymbolUsedInExpression(Sym, Value))
    return Parser.Error(EqualLoc, "Recursive use of '" + Name + "'");
  else if (Sym->isUndefined(/*SetUsed*/ false) && !Sym->isUsed() &&
           !Sym->isVariable())
    ; // Allow redefinitions of undefined symbols only used in directives.
  else if (Sym->isVariable() && !Sym->isUsed() && allow_redef)
    ; // Allow redefinitions of variables that haven't yet been used.
  else if (!Sym->isUndefined() && (!Sym->isVariable() || !allow_redef))
    return Parser.Error(EqualLoc, "redefinition of '" + Name + "'");
  else if (!Sym->isVariable())
    return Parser.Error(EqualLoc, "invalid assignment to '" + Name + "'");
  else if (!isa<MCConstantExpr>(Sym->getVariableValue()))
    return Parser.Error(EqualLoc,
                        "invalid reassignment of non-absolute variable '" +
                            Name + "'");
} else if (Name == ".") {
  Parser.getStreamer().emitValueToOffset(Value, 0, EqualLoc);
  return false;
} else
  Sym = Parser.getContext().getOrCreateSymbol(Name);

Sym->setRedefinable(allow_redef);

return false;
6400}

6402} // end namespace MCParserUtils
6403} // end namespace llvm

6405/// Create an MCAsmParser instance.
6406MCAsmParser *llvm::createMCAsmParser(SourceMgr &SM, MCContext &C,
                                   MCStreamer &Out, const MCAsmInfo &MAI,
                                   unsigned CB) {
if (C.getTargetTriple().isSystemZ() && C.getTargetTriple().isOSzOS())
  return new HLASMAsmParser(SM, C, Out, MAI, CB);

return new AsmParser(SM, C, Out, MAI, CB);
6413}

←

/usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/MC/MCParser/MCAsmLexer.h

→

1//===- llvm/MC/MCAsmLexer.h - Abstract Asm Lexer Interface ------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8 
9#ifndef LLVM_MC_MCPARSER_MCASMLEXER_H
10#define LLVM_MC_MCPARSER_MCASMLEXER_H
11 
12#include "llvm/ADT/ArrayRef.h"
13#include "llvm/ADT/SmallVector.h"
14#include "llvm/MC/MCAsmMacro.h"
15#include <algorithm>
16#include <cassert>
17#include <cstddef>
18#include <cstdint>
19#include <string>
20 
21namespace llvm {
22 
23/// A callback class which is notified of each comment in an assembly file as
24/// it is lexed.
25class AsmCommentConsumer {
26public:
27  virtual ~AsmCommentConsumer() = default;
28 
29  /// Callback function for when a comment is lexed. Loc is the start of the
30  /// comment text (excluding the comment-start marker). CommentText is the text
31  /// of the comment, excluding the comment start and end markers, and the
32  /// newline for single-line comments.
33  virtual void HandleComment(SMLoc Loc, StringRef CommentText) = 0;
34};
35 
36 
37/// Generic assembler lexer interface, for use by target specific assembly
38/// lexers.
39class MCAsmLexer {
40  /// The current token, stored in the base class for faster access.
41  SmallVector<AsmToken, 1> CurTok;
42 
43  /// The location and description of the current error
44  SMLoc ErrLoc;
45  std::string Err;
46 
47protected: // Can only create subclasses.
48  const char *TokStart = nullptr;
49  bool SkipSpace = true;
50  bool AllowAtInIdentifier;
51  bool AllowHashInIdentifier = false;
52  bool IsAtStartOfStatement = true;
53  bool LexMasmHexFloats = false;
54  bool LexMasmIntegers = false;
55  bool LexMasmStrings = false;
56  bool LexMotorolaIntegers = false;
57  bool UseMasmDefaultRadix = false;
58  unsigned DefaultRadix = 10;
59  bool LexHLASMIntegers = false;
60  bool LexHLASMStrings = false;
61  AsmCommentConsumer *CommentConsumer = nullptr;
62 
63  MCAsmLexer();
64 
65  virtual AsmToken LexToken() = 0;
66 
67  void SetError(SMLoc errLoc, const std::string &err) {
68    ErrLoc = errLoc;
69    Err = err;
70  }
71 
72public:
73  MCAsmLexer(const MCAsmLexer &) = delete;
74  MCAsmLexer &operator=(const MCAsmLexer &) = delete;
75  virtual ~MCAsmLexer();
76 
77  /// Consume the next token from the input stream and return it.
78  ///
79  /// The lexer will continuously return the end-of-file token once the end of
80  /// the main input file has been reached.
81  const AsmToken &Lex() {
82    assert(!CurTok.empty())((void)0);
83    // Mark if we parsing out a EndOfStatement.
84    IsAtStartOfStatement = CurTok.front().getKind() == AsmToken::EndOfStatement;
85    CurTok.erase(CurTok.begin());
86    // LexToken may generate multiple tokens via UnLex but will always return
87    // the first one. Place returned value at head of CurTok vector.
88    if (CurTok.empty()) {
89      AsmToken T = LexToken();
90      CurTok.insert(CurTok.begin(), T);
91    }
92    return CurTok.front();
93  }
94 
95  void UnLex(AsmToken const &Token) {
96    IsAtStartOfStatement = false;
97    CurTok.insert(CurTok.begin(), Token);
98  }
99 
100  bool isAtStartOfStatement() { return IsAtStartOfStatement; }
101 
102  virtual StringRef LexUntilEndOfStatement() = 0;
103 
104  /// Get the current source location.
105  SMLoc getLoc() const;
106 
107  /// Get the current (last) lexed token.
108  const AsmToken &getTok() const {
109    return CurTok[0];
110  }
111 
112  /// Look ahead at the next token to be lexed.
113  const AsmToken peekTok(bool ShouldSkipSpace = true) {
114    AsmToken Tok;
115 
116    MutableArrayRef<AsmToken> Buf(Tok);
117    size_t ReadCount = peekTokens(Buf, ShouldSkipSpace);
118 
119    assert(ReadCount == 1)((void)0);
120    (void)ReadCount;
121 
122    return Tok;
123  }
124 
125  /// Look ahead an arbitrary number of tokens.
126  virtual size_t peekTokens(MutableArrayRef<AsmToken> Buf,
127                            bool ShouldSkipSpace = true) = 0;
128 
129  /// Get the current error location
130  SMLoc getErrLoc() {
131    return ErrLoc;
132  }
133 
134  /// Get the current error string
135  const std::string &getErr() {
136    return Err;
137  }
138 
139  /// Get the kind of current token.
140  AsmToken::TokenKind getKind() const { return getTok().getKind(); }
141 
142  /// Check if the current token has kind \p K.
143  bool is(AsmToken::TokenKind K) const { return getTok().is(K); }
31
←
Calling 'AsmToken::is'→
34
←
Returning from 'AsmToken::is'→
35
←
Returning zero, which participates in a condition later→
39
←
Calling 'AsmToken::is'→
42
←
Returning from 'AsmToken::is'→
43
←
Returning zero, which participates in a condition later→
47
←
Calling 'AsmToken::is'→
50
←
Returning from 'AsmToken::is'→
51
←
Returning zero, which participates in a condition later→
55
←
Calling 'AsmToken::is'→
58
←
Returning from 'AsmToken::is'→
59
←
Returning zero, which participates in a condition later→
63
←
Calling 'AsmToken::is'→
66
←
Returning from 'AsmToken::is'→
67
←
Returning zero, which participates in a condition later→
144 
145  /// Check if the current token has kind \p K.
146  bool isNot(AsmToken::TokenKind K) const { return getTok().isNot(K); }
147 
148  /// Set whether spaces should be ignored by the lexer
149  void setSkipSpace(bool val) { SkipSpace = val; }
150 
151  bool getAllowAtInIdentifier() { return AllowAtInIdentifier; }
152  void setAllowAtInIdentifier(bool v) { AllowAtInIdentifier = v; }
153 
154  void setAllowHashInIdentifier(bool V) { AllowHashInIdentifier = V; }
155 
156  void setCommentConsumer(AsmCommentConsumer *CommentConsumer) {
157    this->CommentConsumer = CommentConsumer;
158  }
159 
160  /// Set whether to lex masm-style binary (e.g., 0b1101) and radix-specified
161  /// literals (e.g., 0ABCh [hex], 576t [decimal], 77o [octal], 1101y [binary]).
162  void setLexMasmIntegers(bool V) { LexMasmIntegers = V; }
163 
164  /// Set whether to use masm-style default-radix integer literals. If disabled,
165  /// assume decimal unless prefixed (e.g., 0x2c [hex], 077 [octal]).
166  void useMasmDefaultRadix(bool V) { UseMasmDefaultRadix = V; }
167 
168  unsigned getMasmDefaultRadix() const { return DefaultRadix; }
169  void setMasmDefaultRadix(unsigned Radix) { DefaultRadix = Radix; }
170 
171  /// Set whether to lex masm-style hex float literals, such as 3f800000r.
172  void setLexMasmHexFloats(bool V) { LexMasmHexFloats = V; }
173 
174  /// Set whether to lex masm-style string literals, such as 'Can''t find file'
175  /// and "This ""value"" not found".
176  void setLexMasmStrings(bool V) { LexMasmStrings = V; }
177 
178  /// Set whether to lex Motorola-style integer literals, such as $deadbeef or
179  /// %01010110.
180  void setLexMotorolaIntegers(bool V) { LexMotorolaIntegers = V; }
181 
182  /// Set whether to lex HLASM-flavour integers. For now this is only [0-9]*
183  void setLexHLASMIntegers(bool V) { LexHLASMIntegers = V; }
184 
185  /// Set whether to "lex" HLASM-flavour character and string literals. For now,
186  /// setting this option to true, will disable lexing for character and string
187  /// literals.
188  void setLexHLASMStrings(bool V) { LexHLASMStrings = V; }
189};
190 
191} // end namespace llvm
192 
193#endif // LLVM_MC_MCPARSER_MCASMLEXER_H

←

/usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/MC/MCAsmMacro.h

1//===- MCAsmMacro.h - Assembly Macros ---------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8 
9#ifndef LLVM_MC_MCASMMACRO_H
10#define LLVM_MC_MCASMMACRO_H
11 
12#include "llvm/ADT/APInt.h"
13#include "llvm/ADT/StringRef.h"
14#include "llvm/Support/Debug.h"
15#include "llvm/Support/SMLoc.h"
16#include <vector>
17 
18namespace llvm {
19 
20/// Target independent representation for an assembler token.
21class AsmToken {
22public:
23  enum TokenKind {
24    // Markers
25    Eof, Error,
26 
27    // String values.
28    Identifier,
29    String,
30 
31    // Integer values.
32    Integer,
33    BigNum, // larger than 64 bits
34 
35    // Real values.
36    Real,
37 
38    // Comments
39    Comment,
40    HashDirective,
41    // No-value.
42    EndOfStatement,
43    Colon,
44    Space,
45    Plus, Minus, Tilde,
46    Slash,     // '/'
47    BackSlash, // '\'
48    LParen, RParen, LBrac, RBrac, LCurly, RCurly,
49    Star, Dot, Comma, Dollar, Equal, EqualEqual,
50 
51    Pipe, PipePipe, Caret,
52    Amp, AmpAmp, Exclaim, ExclaimEqual, Percent, Hash,
53    Less, LessEqual, LessLess, LessGreater,
54    Greater, GreaterEqual, GreaterGreater, At, MinusGreater,
55 
56    // MIPS unary expression operators such as %neg.
57    PercentCall16, PercentCall_Hi, PercentCall_Lo, PercentDtprel_Hi,
58    PercentDtprel_Lo, PercentGot, PercentGot_Disp, PercentGot_Hi, PercentGot_Lo,
59    PercentGot_Ofst, PercentGot_Page, PercentGottprel, PercentGp_Rel, PercentHi,
60    PercentHigher, PercentHighest, PercentLo, PercentNeg, PercentPcrel_Hi,
61    PercentPcrel_Lo, PercentTlsgd, PercentTlsldm, PercentTprel_Hi,
62    PercentTprel_Lo
63  };
64 
65private:
66  TokenKind Kind;
67 
68  /// A reference to the entire token contents; this is always a pointer into
69  /// a memory buffer owned by the source manager.
70  StringRef Str;
71 
72  APInt IntVal;
73 
74public:
75  AsmToken() = default;
76  AsmToken(TokenKind Kind, StringRef Str, APInt IntVal)
77      : Kind(Kind), Str(Str), IntVal(std::move(IntVal)) {}
78  AsmToken(TokenKind Kind, StringRef Str, int64_t IntVal = 0)
79      : Kind(Kind), Str(Str), IntVal(64, IntVal, true) {}
80 
81  TokenKind getKind() const { return Kind; }
82  bool is(TokenKind K) const { return Kind == K; }
32
←
Assuming 'K' is not equal to field 'Kind'→
33
←
Returning zero, which participates in a condition later→
40
←
Assuming 'K' is not equal to field 'Kind'→
41
←
Returning zero, which participates in a condition later→
48
←
Assuming 'K' is not equal to field 'Kind'→
49
←
Returning zero, which participates in a condition later→
56
←
Assuming 'K' is not equal to field 'Kind'→
57
←
Returning zero, which participates in a condition later→
64
←
Assuming 'K' is not equal to field 'Kind'→
65
←
Returning zero, which participates in a condition later→
83  bool isNot(TokenKind K) const { return Kind != K; }
84 
85  SMLoc getLoc() const;
86  SMLoc getEndLoc() const;
87  SMRange getLocRange() const;
88 
89  /// Get the contents of a string token (without quotes).
90  StringRef getStringContents() const {
91    assert(Kind == String && "This token isn't a string!")((void)0);
92    return Str.slice(1, Str.size() - 1);
93  }
94 
95  /// Get the identifier string for the current token, which should be an
96  /// identifier or a string. This gets the portion of the string which should
97  /// be used as the identifier, e.g., it does not include the quotes on
98  /// strings.
99  StringRef getIdentifier() const {
100    if (Kind == Identifier)
101      return getString();
102    return getStringContents();
103  }
104 
105  /// Get the string for the current token, this includes all characters (for
106  /// example, the quotes on strings) in the token.
107  ///
108  /// The returned StringRef points into the source manager's memory buffer, and
109  /// is safe to store across calls to Lex().
110  StringRef getString() const { return Str; }
111 
112  // FIXME: Don't compute this in advance, it makes every token larger, and is
113  // also not generally what we want (it is nicer for recovery etc. to lex 123br
114  // as a single token, then diagnose as an invalid number).
115  int64_t getIntVal() const {
116    assert(Kind == Integer && "This token isn't an integer!")((void)0);
117    return IntVal.getZExtValue();
118  }
119 
120  APInt getAPIntVal() const {
121    assert((Kind == Integer || Kind == BigNum) &&((void)0)
122           "This token isn't an integer!")((void)0);
123    return IntVal;
124  }
125 
126  void dump(raw_ostream &OS) const;
127};
128 
129struct MCAsmMacroParameter {
130  StringRef Name;
131  std::vector<AsmToken> Value;
132  bool Required = false;
133  bool Vararg = false;
134 
135#if !defined(NDEBUG1) || defined(LLVM_ENABLE_DUMP)
136  void dump() const { dump(dbgs()); }
137  LLVM_DUMP_METHOD__attribute__((noinline)) void dump(raw_ostream &OS) const;
138#endif
139};
140 
141typedef std::vector<MCAsmMacroParameter> MCAsmMacroParameters;
142struct MCAsmMacro {
143  StringRef Name;
144  StringRef Body;
145  MCAsmMacroParameters Parameters;
146  std::vector<std::string> Locals;
147  bool IsFunction = false;
148 
149public:
150  MCAsmMacro(StringRef N, StringRef B, MCAsmMacroParameters P)
151      : Name(N), Body(B), Parameters(std::move(P)) {}
152  MCAsmMacro(StringRef N, StringRef B, MCAsmMacroParameters P,
153             std::vector<std::string> L, bool F)
154      : Name(N), Body(B), Parameters(std::move(P)), Locals(std::move(L)),
155        IsFunction(F) {}
156 
157#if !defined(NDEBUG1) || defined(LLVM_ENABLE_DUMP)
158  void dump() const { dump(dbgs()); }
159  LLVM_DUMP_METHOD__attribute__((noinline)) void dump(raw_ostream &OS) const;
160#endif
161};
162} // namespace llvm
163 
164#endif