llvm/tools/llvm-objdump/llvm-objdump.cpp

//===-- llvm-objdump.cpp - Object file dumping utility for llvm -----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This program is a utility that works like binutils "objdump", that is, it
// dumps out a plethora of information about an object file depending on the
// flags.
//
// The flags and output of this program should be near identical to those of
// binutils objdump.
//
//===----------------------------------------------------------------------===//

#include "llvm-objdump.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/ADT/Triple.h"
#include "llvm/CodeGen/FaultMaps.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/DebugInfo/Symbolize/Symbolize.h"
#include "llvm/Demangle/Demangle.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDisassembler/MCDisassembler.h"
#include "llvm/MC/MCDisassembler/MCRelocationInfo.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCInstrAnalysis.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/COFF.h"
#include "llvm/Object/COFFImportFile.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/MachOUniversal.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Object/Wasm.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Errc.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/GraphWriter.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/StringSaver.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/WithColor.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cctype>
#include <cstring>
#include <system_error>
#include <unordered_map>
#include <utility>

using namespace llvm::object;

namespace llvm {

// MachO specific
extern cl::opt<bool> Bind;
extern cl::opt<bool> DataInCode;
extern cl::opt<bool> DylibsUsed;
extern cl::opt<bool> DylibId;
extern cl::opt<bool> ExportsTrie;
extern cl::opt<bool> FirstPrivateHeader;
extern cl::opt<bool> IndirectSymbols;
extern cl::opt<bool> InfoPlist;
extern cl::opt<bool> LazyBind;
extern cl::opt<bool> LinkOptHints;
extern cl::opt<bool> ObjcMetaData;
extern cl::opt<bool> Rebase;
extern cl::opt<bool> UniversalHeaders;
extern cl::opt<bool> WeakBind;

static cl::opt<unsigned long long> AdjustVMA(
    "adjust-vma",
    cl::desc("Increase the displayed address by the specified offset"),
    cl::value_desc("offset"), cl::init(0));

static cl::opt<bool>
    AllHeaders("all-headers",
               cl::desc("Display all available header information"));
static cl::alias AllHeadersShort("x", cl::desc("Alias for --all-headers"),
                                 cl::NotHidden, cl::Grouping,
                                 cl::aliasopt(AllHeaders));

static cl::opt<std::string>
    ArchName("arch-name", cl::desc("Target arch to disassemble for, "
                                   "see -version for available targets"));

cl::opt<bool> ArchiveHeaders("archive-headers",
                             cl::desc("Display archive header information"));
static cl::alias ArchiveHeadersShort("a",
                                     cl::desc("Alias for --archive-headers"),
                                     cl::NotHidden, cl::Grouping,
                                     cl::aliasopt(ArchiveHeaders));

cl::opt<bool> Demangle("demangle", cl::desc("Demangle symbols names"),
                       cl::init(false));
static cl::alias DemangleShort("C", cl::desc("Alias for --demangle"),
                               cl::NotHidden, cl::Grouping,
                               cl::aliasopt(Demangle));

cl::opt<bool> Disassemble(
    "disassemble",
    cl::desc("Display assembler mnemonics for the machine instructions"));
static cl::alias DisassembleShort("d", cl::desc("Alias for --disassemble"),
                                  cl::NotHidden, cl::Grouping,
                                  cl::aliasopt(Disassemble));

cl::opt<bool> DisassembleAll(
    "disassemble-all",
    cl::desc("Display assembler mnemonics for the machine instructions"));
static cl::alias DisassembleAllShort("D",
                                     cl::desc("Alias for --disassemble-all"),
                                     cl::NotHidden, cl::Grouping,
                                     cl::aliasopt(DisassembleAll));

static cl::list<std::string>
DisassembleFunctions("disassemble-functions",
                     cl::CommaSeparated,
                     cl::desc("List of functions to disassemble"));

static cl::opt<bool> DisassembleZeroes(
    "disassemble-zeroes",
    cl::desc("Do not skip blocks of zeroes when disassembling"));
static cl::alias
    DisassembleZeroesShort("z", cl::desc("Alias for --disassemble-zeroes"),
                           cl::NotHidden, cl::Grouping,
                           cl::aliasopt(DisassembleZeroes));

static cl::list<std::string>
    DisassemblerOptions("disassembler-options",
                        cl::desc("Pass target specific disassembler options"),
                        cl::value_desc("options"), cl::CommaSeparated);
static cl::alias
    DisassemblerOptionsShort("M", cl::desc("Alias for --disassembler-options"),
                             cl::NotHidden, cl::Grouping, cl::Prefix,
                             cl::CommaSeparated,
                             cl::aliasopt(DisassemblerOptions));

cl::opt<DIDumpType> DwarfDumpType(
    "dwarf", cl::init(DIDT_Null), cl::desc("Dump of dwarf debug sections:"),
    cl::values(clEnumValN(DIDT_DebugFrame, "frames", ".debug_frame")));

static cl::opt<bool> DynamicRelocations(
    "dynamic-reloc",
    cl::desc("Display the dynamic relocation entries in the file"));
static cl::alias DynamicRelocationShort("R",
                                        cl::desc("Alias for --dynamic-reloc"),
                                        cl::NotHidden, cl::Grouping,
                                        cl::aliasopt(DynamicRelocations));

static cl::opt<bool>
    FaultMapSection("fault-map-section",
                   cl::desc("Display contents of faultmap section"));

static cl::opt<bool>
    FileHeaders("file-headers",
                cl::desc("Display the contents of the overall file header"));
static cl::alias FileHeadersShort("f", cl::desc("Alias for --file-headers"),
                                  cl::NotHidden, cl::Grouping,
                                  cl::aliasopt(FileHeaders));

cl::opt<bool> SectionContents("full-contents",
                              cl::desc("Display the content of each section"));
static cl::alias SectionContentsShort("s",
                                      cl::desc("Alias for --full-contents"),
                                      cl::NotHidden, cl::Grouping,
                                      cl::aliasopt(SectionContents));

static cl::list<std::string>
InputFilenames(cl::Positional, cl::desc("<input object files>"),cl::ZeroOrMore);

static cl::opt<bool>
    PrintLines("line-numbers",
               cl::desc("Display source line numbers with "
                        "disassembly. Implies disassemble object"));
static cl::alias PrintLinesShort("l", cl::desc("Alias for --line-numbers"),
                                 cl::NotHidden, cl::Grouping,
                                 cl::aliasopt(PrintLines));

static cl::opt<bool>
MachOOpt("macho", cl::desc("Use MachO specific object file parser"));
static cl::alias MachOm("m", cl::desc("Alias for --macho"), cl::NotHidden,
                        cl::Grouping, cl::aliasopt(MachOOpt));

cl::opt<std::string>
    MCPU("mcpu",
         cl::desc("Target a specific cpu type (-mcpu=help for details)"),
         cl::value_desc("cpu-name"), cl::init(""));

cl::list<std::string> MAttrs("mattr", cl::CommaSeparated,
                             cl::desc("Target specific attributes"),
                             cl::value_desc("a1,+a2,-a3,..."));

cl::opt<bool> NoShowRawInsn("no-show-raw-insn",
                            cl::desc("When disassembling "
                                     "instructions, do not print "
                                     "the instruction bytes."));
cl::opt<bool> NoLeadingAddr("no-leading-addr",
                                   cl::desc("Print no leading address"));

static cl::opt<bool> RawClangAST(
    "raw-clang-ast",
    cl::desc("Dump the raw binary contents of the clang AST section"));

cl::opt<bool>
    Relocations("reloc",
                cl::desc("Display the relocation entries in the file"));
static cl::alias RelocationsShort("r", cl::desc("Alias for --reloc"),
                                  cl::NotHidden, cl::Grouping,
                                  cl::aliasopt(Relocations));

cl::opt<bool>
    PrintImmHex("print-imm-hex",
                cl::desc("Use hex format for immediate values"));

cl::opt<bool>
    PrivateHeaders("private-headers",
                   cl::desc("Display format specific file headers"));
static cl::alias PrivateHeadersShort("p",
                                     cl::desc("Alias for --private-headers"),
                                     cl::NotHidden, cl::Grouping,
                                     cl::aliasopt(PrivateHeaders));

cl::list<std::string>
    FilterSections("section",
                   cl::desc("Operate on the specified sections only. "
                            "With -macho dump segment,section"));
static cl::alias FilterSectionsj("j", cl::desc("Alias for --section"),
                                 cl::NotHidden, cl::Grouping, cl::Prefix,
                                 cl::aliasopt(FilterSections));

cl::opt<bool> SectionHeaders("section-headers",
                             cl::desc("Display summaries of the "
                                      "headers for each section."));
static cl::alias SectionHeadersShort("headers",
                                     cl::desc("Alias for --section-headers"),
                                     cl::NotHidden,
                                     cl::aliasopt(SectionHeaders));
static cl::alias SectionHeadersShorter("h",
                                       cl::desc("Alias for --section-headers"),
                                       cl::NotHidden, cl::Grouping,
                                       cl::aliasopt(SectionHeaders));

static cl::opt<bool>
    ShowLMA("show-lma",
            cl::desc("Display LMA column when dumping ELF section headers"));

static cl::opt<bool> PrintSource(
    "source",
    cl::desc(
        "Display source inlined with disassembly. Implies disassemble object"));
static cl::alias PrintSourceShort("S", cl::desc("Alias for -source"),
                                  cl::NotHidden, cl::Grouping,
                                  cl::aliasopt(PrintSource));

static cl::opt<unsigned long long>
    StartAddress("start-address", cl::desc("Disassemble beginning at address"),
                 cl::value_desc("address"), cl::init(0));
static cl::opt<unsigned long long>
    StopAddress("stop-address", cl::desc("Stop disassembly at address"),
                cl::value_desc("address"), cl::init(UINT64_MAX));

cl::opt<bool> SymbolTable("syms", cl::desc("Display the symbol table"));
static cl::alias SymbolTableShort("t", cl::desc("Alias for --syms"),
                                  cl::NotHidden, cl::Grouping,
                                  cl::aliasopt(SymbolTable));

cl::opt<std::string> TripleName("triple",
                                cl::desc("Target triple to disassemble for, "
                                         "see -version for available targets"));

cl::opt<bool> UnwindInfo("unwind-info",
                                cl::desc("Display unwind information"));
static cl::alias UnwindInfoShort("u", cl::desc("Alias for --unwind-info"),
                                 cl::NotHidden, cl::Grouping,
                                 cl::aliasopt(UnwindInfo));


static cl::opt<bool>
    Wide("wide", cl::desc("Ignored for compatibility with GNU objdump"));
static cl::alias WideShort("w", cl::Grouping, cl::aliasopt(Wide));

static StringSet<> DisasmFuncsSet;
static StringRef ToolName;

typedef std::vector<std::tuple<uint64_t, StringRef, uint8_t>> SectionSymbolsTy;

SectionFilter ToolSectionFilter(object::ObjectFile const &O) {
  return SectionFilter(
      [](object::SectionRef const &S) {
        if (FilterSections.empty())
          return true;
        StringRef String;
        std::error_code error = S.getName(String);
        if (error)
          return false;
        return is_contained(FilterSections, String);
      },
      O);
}

void error(std::error_code EC) {
  if (!EC)
    return;
  WithColor::error(errs(), ToolName)
      << "reading file: " << EC.message() << ".\n";
  errs().flush();
  exit(1);
}

void error(Error E) {
  if (!E)
    return;
  WithColor::error(errs(), ToolName) << toString(std::move(E));
  exit(1);
}

LLVM_ATTRIBUTE_NORETURN void error(Twine Message) {
  WithColor::error(errs(), ToolName) << Message << ".\n";
  errs().flush();
  exit(1);
}

void warn(StringRef Message) {
  WithColor::warning(errs(), ToolName) << Message << ".\n";
  errs().flush();
}

LLVM_ATTRIBUTE_NORETURN void report_error(StringRef File, Twine Message) {
  WithColor::error(errs(), ToolName)
      << "'" << File << "': " << Message << ".\n";
  exit(1);
}

LLVM_ATTRIBUTE_NORETURN void report_error(Error E, StringRef File) {
  assert(E);
  std::string Buf;
  raw_string_ostream OS(Buf);
  logAllUnhandledErrors(std::move(E), OS);
  OS.flush();
  WithColor::error(errs(), ToolName) << "'" << File << "': " << Buf;
  exit(1);
}

LLVM_ATTRIBUTE_NORETURN void report_error(Error E, StringRef ArchiveName,
                                          StringRef FileName,
                                          StringRef ArchitectureName) {
  assert(E);
  WithColor::error(errs(), ToolName);
  if (ArchiveName != "")
    errs() << ArchiveName << "(" << FileName << ")";
  else
    errs() << "'" << FileName << "'";
  if (!ArchitectureName.empty())
    errs() << " (for architecture " << ArchitectureName << ")";
  std::string Buf;
  raw_string_ostream OS(Buf);
  logAllUnhandledErrors(std::move(E), OS);
  OS.flush();
  errs() << ": " << Buf;
  exit(1);
}

LLVM_ATTRIBUTE_NORETURN void report_error(Error E, StringRef ArchiveName,
                                          const object::Archive::Child &C,
                                          StringRef ArchitectureName) {
  Expected<StringRef> NameOrErr = C.getName();
  // TODO: if we have a error getting the name then it would be nice to print
  // the index of which archive member this is and or its offset in the
  // archive instead of "???" as the name.
  if (!NameOrErr) {
    consumeError(NameOrErr.takeError());
    report_error(std::move(E), ArchiveName, "???", ArchitectureName);
  } else
    report_error(std::move(E), ArchiveName, NameOrErr.get(), ArchitectureName);
}

static const Target *getTarget(const ObjectFile *Obj = nullptr) {
  // Figure out the target triple.
  Triple TheTriple("unknown-unknown-unknown");
  if (TripleName.empty()) {
    if (Obj)
      TheTriple = Obj->makeTriple();
  } else {
    TheTriple.setTriple(Triple::normalize(TripleName));

    // Use the triple, but also try to combine with ARM build attributes.
    if (Obj) {
      auto Arch = Obj->getArch();
      if (Arch == Triple::arm || Arch == Triple::armeb)
        Obj->setARMSubArch(TheTriple);
    }
  }

  // Get the target specific parser.
  std::string Error;
  const Target *TheTarget = TargetRegistry::lookupTarget(ArchName, TheTriple,
                                                         Error);
  if (!TheTarget) {
    if (Obj)
      report_error(Obj->getFileName(), "can't find target: " + Error);
    else
      error("can't find target: " + Error);
  }

  // Update the triple name and return the found target.
  TripleName = TheTriple.getTriple();
  return TheTarget;
}

bool isRelocAddressLess(RelocationRef A, RelocationRef B) {
  return A.getOffset() < B.getOffset();
}

static Error getRelocationValueString(const RelocationRef &Rel,
                                      SmallVectorImpl<char> &Result) {
  const ObjectFile *Obj = Rel.getObject();
  if (auto *ELF = dyn_cast<ELFObjectFileBase>(Obj))
    return getELFRelocationValueString(ELF, Rel, Result);
  if (auto *COFF = dyn_cast<COFFObjectFile>(Obj))
    return getCOFFRelocationValueString(COFF, Rel, Result);
  if (auto *Wasm = dyn_cast<WasmObjectFile>(Obj))
    return getWasmRelocationValueString(Wasm, Rel, Result);
  if (auto *MachO = dyn_cast<MachOObjectFile>(Obj))
    return getMachORelocationValueString(MachO, Rel, Result);
  llvm_unreachable("unknown object file format");
}

/// Indicates whether this relocation should hidden when listing
/// relocations, usually because it is the trailing part of a multipart
/// relocation that will be printed as part of the leading relocation.
static bool getHidden(RelocationRef RelRef) {
  auto *MachO = dyn_cast<MachOObjectFile>(RelRef.getObject());
  if (!MachO)
    return false;

  unsigned Arch = MachO->getArch();
  DataRefImpl Rel = RelRef.getRawDataRefImpl();
  uint64_t Type = MachO->getRelocationType(Rel);

  // On arches that use the generic relocations, GENERIC_RELOC_PAIR
  // is always hidden.
  if (Arch == Triple::x86 || Arch == Triple::arm || Arch == Triple::ppc)
    return Type == MachO::GENERIC_RELOC_PAIR;

  if (Arch == Triple::x86_64) {
    // On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
    // an X86_64_RELOC_SUBTRACTOR.
    if (Type == MachO::X86_64_RELOC_UNSIGNED && Rel.d.a > 0) {
      DataRefImpl RelPrev = Rel;
      RelPrev.d.a--;
      uint64_t PrevType = MachO->getRelocationType(RelPrev);
      if (PrevType == MachO::X86_64_RELOC_SUBTRACTOR)
        return true;
    }
  }

  return false;
}

namespace {
class SourcePrinter {
protected:
  DILineInfo OldLineInfo;
  const ObjectFile *Obj = nullptr;
  std::unique_ptr<symbolize::LLVMSymbolizer> Symbolizer;
  // File name to file contents of source
  std::unordered_map<std::string, std::unique_ptr<MemoryBuffer>> SourceCache;
  // Mark the line endings of the cached source
  std::unordered_map<std::string, std::vector<StringRef>> LineCache;

private:
  bool cacheSource(const DILineInfo& LineInfoFile);

public:
  SourcePrinter() = default;
  SourcePrinter(const ObjectFile *Obj, StringRef DefaultArch) : Obj(Obj) {
    symbolize::LLVMSymbolizer::Options SymbolizerOpts(
        DILineInfoSpecifier::FunctionNameKind::None, true, false, false,
        DefaultArch);
    Symbolizer.reset(new symbolize::LLVMSymbolizer(SymbolizerOpts));
  }
  virtual ~SourcePrinter() = default;
  virtual void printSourceLine(raw_ostream &OS,
                               object::SectionedAddress Address,
                               StringRef Delimiter = "; ");
};

bool SourcePrinter::cacheSource(const DILineInfo &LineInfo) {
  std::unique_ptr<MemoryBuffer> Buffer;
  if (LineInfo.Source) {
    Buffer = MemoryBuffer::getMemBuffer(*LineInfo.Source);
  } else {
    auto BufferOrError = MemoryBuffer::getFile(LineInfo.FileName);
    if (!BufferOrError)
      return false;
    Buffer = std::move(*BufferOrError);
  }
  // Chomp the file to get lines
  const char *BufferStart = Buffer->getBufferStart(),
             *BufferEnd = Buffer->getBufferEnd();
  std::vector<StringRef> &Lines = LineCache[LineInfo.FileName];
  const char *Start = BufferStart;
  for (const char *I = BufferStart; I != BufferEnd; ++I)
    if (*I == '\n') {
      Lines.emplace_back(Start, I - Start - (BufferStart < I && I[-1] == '\r'));
      Start = I + 1;
    }
  if (Start < BufferEnd)
    Lines.emplace_back(Start, BufferEnd - Start);
  SourceCache[LineInfo.FileName] = std::move(Buffer);
  return true;
}

void SourcePrinter::printSourceLine(raw_ostream &OS,
                                    object::SectionedAddress Address,
                                    StringRef Delimiter) {
  if (!Symbolizer)
    return;
  DILineInfo LineInfo = DILineInfo();
  auto ExpectedLineInfo =
      Symbolizer->symbolizeCode(Obj->getFileName(), Address);
  if (!ExpectedLineInfo)
    consumeError(ExpectedLineInfo.takeError());
  else
    LineInfo = *ExpectedLineInfo;

  if ((LineInfo.FileName == "<invalid>") || OldLineInfo.Line == LineInfo.Line ||
      LineInfo.Line == 0)
    return;

  if (PrintLines)
    OS << Delimiter << LineInfo.FileName << ":" << LineInfo.Line << "\n";
  if (PrintSource) {
    if (SourceCache.find(LineInfo.FileName) == SourceCache.end())
      if (!cacheSource(LineInfo))
        return;
    auto LineBuffer = LineCache.find(LineInfo.FileName);
    if (LineBuffer != LineCache.end()) {
      if (LineInfo.Line > LineBuffer->second.size())
        return;
      // Vector begins at 0, line numbers are non-zero
      OS << Delimiter << LineBuffer->second[LineInfo.Line - 1] << '\n';
    }
  }
  OldLineInfo = LineInfo;
}

static bool isArmElf(const ObjectFile *Obj) {
  return (Obj->isELF() &&
          (Obj->getArch() == Triple::aarch64 ||
           Obj->getArch() == Triple::aarch64_be ||
           Obj->getArch() == Triple::arm || Obj->getArch() == Triple::armeb ||
           Obj->getArch() == Triple::thumb ||
           Obj->getArch() == Triple::thumbeb));
}

static void printRelocation(const RelocationRef &Rel, uint64_t Address,
                            uint8_t AddrSize) {
  StringRef Fmt =
      AddrSize > 4 ? "\t\t%016" PRIx64 ":  " : "\t\t\t%08" PRIx64 ":  ";
  SmallString<16> Name;
  SmallString<32> Val;
  Rel.getTypeName(Name);
  error(getRelocationValueString(Rel, Val));
  outs() << format(Fmt.data(), Address) << Name << "\t" << Val << "\n";
}

class PrettyPrinter {
public:
  virtual ~PrettyPrinter() = default;
  virtual void printInst(MCInstPrinter &IP, const MCInst *MI,
                         ArrayRef<uint8_t> Bytes,
                         object::SectionedAddress Address, raw_ostream &OS,
                         StringRef Annot, MCSubtargetInfo const &STI,
                         SourcePrinter *SP,
                         std::vector<RelocationRef> *Rels = nullptr) {
    if (SP && (PrintSource || PrintLines))
      SP->printSourceLine(OS, Address);

    {
      formatted_raw_ostream FOS(OS);
      if (!NoLeadingAddr)
        FOS << format("%8" PRIx64 ":", Address.Address);
      if (!NoShowRawInsn) {
        FOS << ' ';
        dumpBytes(Bytes, FOS);
      }
      FOS.flush();
      // The output of printInst starts with a tab. Print some spaces so that
      // the tab has 1 column and advances to the target tab stop.
      unsigned TabStop = NoShowRawInsn ? 16 : 40;
      unsigned Column = FOS.getColumn();
      FOS.indent(Column < TabStop - 1 ? TabStop - 1 - Column : 7 - Column % 8);

      // The dtor calls flush() to ensure the indent comes before printInst().
    }

    if (MI)
      IP.printInst(MI, OS, "", STI);
    else
      OS << "\t<unknown>";
  }
};
PrettyPrinter PrettyPrinterInst;
class HexagonPrettyPrinter : public PrettyPrinter {
public:
  void printLead(ArrayRef<uint8_t> Bytes, uint64_t Address,
                 raw_ostream &OS) {
    uint32_t opcode =
      (Bytes[3] << 24) | (Bytes[2] << 16) | (Bytes[1] << 8) | Bytes[0];
    if (!NoLeadingAddr)
      OS << format("%8" PRIx64 ":", Address);
    if (!NoShowRawInsn) {
      OS << "\t";
      dumpBytes(Bytes.slice(0, 4), OS);
      OS << format("\t%08" PRIx32, opcode);
    }
  }
  void printInst(MCInstPrinter &IP, const MCInst *MI, ArrayRef<uint8_t> Bytes,
                 object::SectionedAddress Address, raw_ostream &OS,
                 StringRef Annot, MCSubtargetInfo const &STI, SourcePrinter *SP,
                 std::vector<RelocationRef> *Rels) override {
    if (SP && (PrintSource || PrintLines))
      SP->printSourceLine(OS, Address, "");
    if (!MI) {
      printLead(Bytes, Address.Address, OS);
      OS << " <unknown>";
      return;
    }
    std::string Buffer;
    {
      raw_string_ostream TempStream(Buffer);
      IP.printInst(MI, TempStream, "", STI);
    }
    StringRef Contents(Buffer);
    // Split off bundle attributes
    auto PacketBundle = Contents.rsplit('\n');
    // Split off first instruction from the rest
    auto HeadTail = PacketBundle.first.split('\n');
    auto Preamble = " { ";
    auto Separator = "";

    // Hexagon's packets require relocations to be inline rather than
    // clustered at the end of the packet.
    std::vector<RelocationRef>::const_iterator RelCur = Rels->begin();
    std::vector<RelocationRef>::const_iterator RelEnd = Rels->end();
    auto PrintReloc = [&]() -> void {
      while ((RelCur != RelEnd) && (RelCur->getOffset() <= Address.Address)) {
        if (RelCur->getOffset() == Address.Address) {
          printRelocation(*RelCur, Address.Address, 4);
          return;
        }
        ++RelCur;
      }
    };

    while (!HeadTail.first.empty()) {
      OS << Separator;
      Separator = "\n";
      if (SP && (PrintSource || PrintLines))
        SP->printSourceLine(OS, Address, "");
      printLead(Bytes, Address.Address, OS);
      OS << Preamble;
      Preamble = "   ";
      StringRef Inst;
      auto Duplex = HeadTail.first.split('\v');
      if (!Duplex.second.empty()) {
        OS << Duplex.first;
        OS << "; ";
        Inst = Duplex.second;
      }
      else
        Inst = HeadTail.first;
      OS << Inst;
      HeadTail = HeadTail.second.split('\n');
      if (HeadTail.first.empty())
        OS << " } " << PacketBundle.second;
      PrintReloc();
      Bytes = Bytes.slice(4);
      Address.Address += 4;
    }
  }
};
HexagonPrettyPrinter HexagonPrettyPrinterInst;

class AMDGCNPrettyPrinter : public PrettyPrinter {
public:
  void printInst(MCInstPrinter &IP, const MCInst *MI, ArrayRef<uint8_t> Bytes,
                 object::SectionedAddress Address, raw_ostream &OS,
                 StringRef Annot, MCSubtargetInfo const &STI, SourcePrinter *SP,
                 std::vector<RelocationRef> *Rels) override {
    if (SP && (PrintSource || PrintLines))
      SP->printSourceLine(OS, Address);

    typedef support::ulittle32_t U32;

    if (MI) {
      SmallString<40> InstStr;
      raw_svector_ostream IS(InstStr);

      IP.printInst(MI, IS, "", STI);

      OS << left_justify(IS.str(), 60);
    } else {
      // an unrecognized encoding - this is probably data so represent it
      // using the .long directive, or .byte directive if fewer than 4 bytes
      // remaining
      if (Bytes.size() >= 4) {
        OS << format("\t.long 0x%08" PRIx32 " ",
                     static_cast<uint32_t>(*reinterpret_cast<const U32*>(Bytes.data())));
        OS.indent(42);
      } else {
          OS << format("\t.byte 0x%02" PRIx8, Bytes[0]);
          for (unsigned int i = 1; i < Bytes.size(); i++)
            OS << format(", 0x%02" PRIx8, Bytes[i]);
          OS.indent(55 - (6 * Bytes.size()));
      }
    }

    OS << format("// %012" PRIX64 ": ", Address.Address);
    if (Bytes.size() >=4) {
      for (auto D : makeArrayRef(reinterpret_cast<const U32*>(Bytes.data()),
                                 Bytes.size() / sizeof(U32)))
        // D should be explicitly casted to uint32_t here as it is passed
        // by format to snprintf as vararg.
        OS << format("%08" PRIX32 " ", static_cast<uint32_t>(D));
    } else {
      for (unsigned int i = 0; i < Bytes.size(); i++)
        OS << format("%02" PRIX8 " ", Bytes[i]);
    }

    if (!Annot.empty())
      OS << "// " << Annot;
  }
};
AMDGCNPrettyPrinter AMDGCNPrettyPrinterInst;

class BPFPrettyPrinter : public PrettyPrinter {
public:
  void printInst(MCInstPrinter &IP, const MCInst *MI, ArrayRef<uint8_t> Bytes,
                 object::SectionedAddress Address, raw_ostream &OS,
                 StringRef Annot, MCSubtargetInfo const &STI, SourcePrinter *SP,
                 std::vector<RelocationRef> *Rels) override {
    if (SP && (PrintSource || PrintLines))
      SP->printSourceLine(OS, Address);
    if (!NoLeadingAddr)
      OS << format("%8" PRId64 ":", Address.Address / 8);
    if (!NoShowRawInsn) {
      OS << "\t";
      dumpBytes(Bytes, OS);
    }
    if (MI)
      IP.printInst(MI, OS, "", STI);
    else
      OS << "\t<unknown>";
  }
};
BPFPrettyPrinter BPFPrettyPrinterInst;

PrettyPrinter &selectPrettyPrinter(Triple const &Triple) {
  switch(Triple.getArch()) {
  default:
    return PrettyPrinterInst;
  case Triple::hexagon:
    return HexagonPrettyPrinterInst;
  case Triple::amdgcn:
    return AMDGCNPrettyPrinterInst;
  case Triple::bpfel:
  case Triple::bpfeb:
    return BPFPrettyPrinterInst;
  }
}
}

static uint8_t getElfSymbolType(const ObjectFile *Obj, const SymbolRef &Sym) {
  assert(Obj->isELF());
  if (auto *Elf32LEObj = dyn_cast<ELF32LEObjectFile>(Obj))
    return Elf32LEObj->getSymbol(Sym.getRawDataRefImpl())->getType();
  if (auto *Elf64LEObj = dyn_cast<ELF64LEObjectFile>(Obj))
    return Elf64LEObj->getSymbol(Sym.getRawDataRefImpl())->getType();
  if (auto *Elf32BEObj = dyn_cast<ELF32BEObjectFile>(Obj))
    return Elf32BEObj->getSymbol(Sym.getRawDataRefImpl())->getType();
  if (auto *Elf64BEObj = cast<ELF64BEObjectFile>(Obj))
    return Elf64BEObj->getSymbol(Sym.getRawDataRefImpl())->getType();
  llvm_unreachable("Unsupported binary format");
}

template <class ELFT> static void
addDynamicElfSymbols(const ELFObjectFile<ELFT> *Obj,
                     std::map<SectionRef, SectionSymbolsTy> &AllSymbols) {
  for (auto Symbol : Obj->getDynamicSymbolIterators()) {
    uint8_t SymbolType = Symbol.getELFType();
    if (SymbolType != ELF::STT_FUNC || Symbol.getSize() == 0)
      continue;

    uint64_t Address = unwrapOrError(Symbol.getAddress(), Obj->getFileName());
    StringRef Name = unwrapOrError(Symbol.getName(), Obj->getFileName());
    if (Name.empty())
      continue;

    section_iterator SecI =
        unwrapOrError(Symbol.getSection(), Obj->getFileName());
    if (SecI == Obj->section_end())
      continue;

    AllSymbols[*SecI].emplace_back(Address, Name, SymbolType);
  }
}

static void
addDynamicElfSymbols(const ObjectFile *Obj,
                     std::map<SectionRef, SectionSymbolsTy> &AllSymbols) {
  assert(Obj->isELF());
  if (auto *Elf32LEObj = dyn_cast<ELF32LEObjectFile>(Obj))
    addDynamicElfSymbols(Elf32LEObj, AllSymbols);
  else if (auto *Elf64LEObj = dyn_cast<ELF64LEObjectFile>(Obj))
    addDynamicElfSymbols(Elf64LEObj, AllSymbols);
  else if (auto *Elf32BEObj = dyn_cast<ELF32BEObjectFile>(Obj))
    addDynamicElfSymbols(Elf32BEObj, AllSymbols);
  else if (auto *Elf64BEObj = cast<ELF64BEObjectFile>(Obj))
    addDynamicElfSymbols(Elf64BEObj, AllSymbols);
  else
    llvm_unreachable("Unsupported binary format");
}

static void addPltEntries(const ObjectFile *Obj,
                          std::map<SectionRef, SectionSymbolsTy> &AllSymbols,
                          StringSaver &Saver) {
  Optional<SectionRef> Plt = None;
  for (const SectionRef &Section : Obj->sections()) {
    StringRef Name;
    if (Section.getName(Name))
      continue;
    if (Name == ".plt")
      Plt = Section;
  }
  if (!Plt)
    return;
  if (auto *ElfObj = dyn_cast<ELFObjectFileBase>(Obj)) {
    for (auto PltEntry : ElfObj->getPltAddresses()) {
      SymbolRef Symbol(PltEntry.first, ElfObj);
      uint8_t SymbolType = getElfSymbolType(Obj, Symbol);

      StringRef Name = unwrapOrError(Symbol.getName(), Obj->getFileName());
      if (!Name.empty())
        AllSymbols[*Plt].emplace_back(
            PltEntry.second, Saver.save((Name + "@plt").str()), SymbolType);
    }
  }
}

// Normally the disassembly output will skip blocks of zeroes. This function
// returns the number of zero bytes that can be skipped when dumping the
// disassembly of the instructions in Buf.
static size_t countSkippableZeroBytes(ArrayRef<uint8_t> Buf) {
  // Find the number of leading zeroes.
  size_t N = 0;
  while (N < Buf.size() && !Buf[N])
    ++N;

  // We may want to skip blocks of zero bytes, but unless we see
  // at least 8 of them in a row.
  if (N < 8)
    return 0;

  // We skip zeroes in multiples of 4 because do not want to truncate an
  // instruction if it starts with a zero byte.
  return N & ~0x3;
}

// Returns a map from sections to their relocations.
static std::map<SectionRef, std::vector<RelocationRef>>
getRelocsMap(object::ObjectFile const &Obj) {
  std::map<SectionRef, std::vector<RelocationRef>> Ret;
  for (const SectionRef &Section : ToolSectionFilter(Obj)) {
    section_iterator RelSec = Section.getRelocatedSection();
    if (RelSec == Obj.section_end())
      continue;
    std::vector<RelocationRef> &V = Ret[*RelSec];
    for (const RelocationRef &R : Section.relocations())
      V.push_back(R);
    // Sort relocations by address.
    llvm::sort(V, isRelocAddressLess);
  }
  return Ret;
}

// Used for --adjust-vma to check if address should be adjusted by the
// specified value for a given section.
// For ELF we do not adjust non-allocatable sections like debug ones,
// because they are not loadable.
// TODO: implement for other file formats.
static bool shouldAdjustVA(const SectionRef &Section) {
  const ObjectFile *Obj = Section.getObject();
  if (isa<object::ELFObjectFileBase>(Obj))
    return ELFSectionRef(Section).getFlags() & ELF::SHF_ALLOC;
  return false;
}

static uint64_t
dumpARMELFData(uint64_t SectionAddr, uint64_t Index, uint64_t End,
               const ObjectFile *Obj, ArrayRef<uint8_t> Bytes,
               const std::vector<uint64_t> &TextMappingSymsAddr) {
  support::endianness Endian =
      Obj->isLittleEndian() ? support::little : support::big;
  while (Index < End) {
    outs() << format("%8" PRIx64 ":", SectionAddr + Index);
    outs() << "\t";
    if (Index + 4 <= End) {
      dumpBytes(Bytes.slice(Index, 4), outs());
      outs() << "\t.word\t"
             << format_hex(
                    support::endian::read32(Bytes.data() + Index, Endian), 10);
      Index += 4;
    } else if (Index + 2 <= End) {
      dumpBytes(Bytes.slice(Index, 2), outs());
      outs() << "\t\t.short\t"
             << format_hex(
                    support::endian::read16(Bytes.data() + Index, Endian), 6);
      Index += 2;
    } else {
      dumpBytes(Bytes.slice(Index, 1), outs());
      outs() << "\t\t.byte\t" << format_hex(Bytes[0], 4);
      ++Index;
    }
    outs() << "\n";
    if (std::binary_search(TextMappingSymsAddr.begin(),
                           TextMappingSymsAddr.end(), Index))
      break;
  }
  return Index;
}

static void dumpELFData(uint64_t SectionAddr, uint64_t Index, uint64_t End,
                        ArrayRef<uint8_t> Bytes) {
  // print out data up to 8 bytes at a time in hex and ascii
  uint8_t AsciiData[9] = {'\0'};
  uint8_t Byte;
  int NumBytes = 0;

  for (; Index < End; ++Index) {
    if (NumBytes == 0) {
      outs() << format("%8" PRIx64 ":", SectionAddr + Index);
      outs() << "\t";
    }
    Byte = Bytes.slice(Index)[0];
    outs() << format(" %02x", Byte);
    AsciiData[NumBytes] = isPrint(Byte) ? Byte : '.';

    uint8_t IndentOffset = 0;
    NumBytes++;
    if (Index == End - 1 || NumBytes > 8) {
      // Indent the space for less than 8 bytes data.
      // 2 spaces for byte and one for space between bytes
      IndentOffset = 3 * (8 - NumBytes);
      for (int Excess = NumBytes; Excess < 8; Excess++)
        AsciiData[Excess] = '\0';
      NumBytes = 8;
    }
    if (NumBytes == 8) {
      AsciiData[8] = '\0';
      outs() << std::string(IndentOffset, ' ') << "         ";
      outs() << reinterpret_cast<char *>(AsciiData);
      outs() << '\n';
      NumBytes = 0;
    }
  }
}

static void disassembleObject(const Target *TheTarget, const ObjectFile *Obj,
                              MCContext &Ctx, MCDisassembler *DisAsm,
                              const MCInstrAnalysis *MIA, MCInstPrinter *IP,
                              const MCSubtargetInfo *STI, PrettyPrinter &PIP,
                              SourcePrinter &SP, bool InlineRelocs) {
  std::map<SectionRef, std::vector<RelocationRef>> RelocMap;
  if (InlineRelocs)
    RelocMap = getRelocsMap(*Obj);

  // Create a mapping from virtual address to symbol name.  This is used to
  // pretty print the symbols while disassembling.
  std::map<SectionRef, SectionSymbolsTy> AllSymbols;
  SectionSymbolsTy AbsoluteSymbols;
  const StringRef FileName = Obj->getFileName();
  for (const SymbolRef &Symbol : Obj->symbols()) {
    uint64_t Address = unwrapOrError(Symbol.getAddress(), FileName);

    StringRef Name = unwrapOrError(Symbol.getName(), FileName);
    if (Name.empty())
      continue;

    uint8_t SymbolType = ELF::STT_NOTYPE;
    if (Obj->isELF()) {
      SymbolType = getElfSymbolType(Obj, Symbol);
      if (SymbolType == ELF::STT_SECTION)
        continue;
    }

    section_iterator SecI = unwrapOrError(Symbol.getSection(), FileName);
    if (SecI != Obj->section_end())
      AllSymbols[*SecI].emplace_back(Address, Name, SymbolType);
    else
      AbsoluteSymbols.emplace_back(Address, Name, SymbolType);
  }
  if (AllSymbols.empty() && Obj->isELF())
    addDynamicElfSymbols(Obj, AllSymbols);

  BumpPtrAllocator A;
  StringSaver Saver(A);
  addPltEntries(Obj, AllSymbols, Saver);

  // Create a mapping from virtual address to section.
  std::vector<std::pair<uint64_t, SectionRef>> SectionAddresses;
  for (SectionRef Sec : Obj->sections())
    SectionAddresses.emplace_back(Sec.getAddress(), Sec);
  array_pod_sort(SectionAddresses.begin(), SectionAddresses.end());

  // Linked executables (.exe and .dll files) typically don't include a real
  // symbol table but they might contain an export table.
  if (const auto *COFFObj = dyn_cast<COFFObjectFile>(Obj)) {
    for (const auto &ExportEntry : COFFObj->export_directories()) {
      StringRef Name;
      error(ExportEntry.getSymbolName(Name));
      if (Name.empty())
        continue;
      uint32_t RVA;
      error(ExportEntry.getExportRVA(RVA));

      uint64_t VA = COFFObj->getImageBase() + RVA;
      auto Sec = llvm::bsearch(
          SectionAddresses, [VA](const std::pair<uint64_t, SectionRef> &RHS) {
            return VA < RHS.first;
          });
      if (Sec != SectionAddresses.begin()) {
        --Sec;
        AllSymbols[Sec->second].emplace_back(VA, Name, ELF::STT_NOTYPE);
      } else
        AbsoluteSymbols.emplace_back(VA, Name, ELF::STT_NOTYPE);
    }
  }

  // Sort all the symbols, this allows us to use a simple binary search to find
  // a symbol near an address.
  for (std::pair<const SectionRef, SectionSymbolsTy> &SecSyms : AllSymbols)
    array_pod_sort(SecSyms.second.begin(), SecSyms.second.end());
  array_pod_sort(AbsoluteSymbols.begin(), AbsoluteSymbols.end());

  for (const SectionRef &Section : ToolSectionFilter(*Obj)) {
    if (!DisassembleAll && (!Section.isText() || Section.isVirtual()))
      continue;

    uint64_t SectionAddr = Section.getAddress();
    uint64_t SectSize = Section.getSize();
    if (!SectSize)
      continue;

    // Get the list of all the symbols in this section.
    SectionSymbolsTy &Symbols = AllSymbols[Section];
    std::vector<uint64_t> DataMappingSymsAddr;
    std::vector<uint64_t> TextMappingSymsAddr;
    if (isArmElf(Obj)) {
      for (const auto &Symb : Symbols) {
        uint64_t Address = std::get<0>(Symb);
        StringRef Name = std::get<1>(Symb);
        if (Name.startswith("$d"))
          DataMappingSymsAddr.push_back(Address - SectionAddr);
        if (Name.startswith("$x"))
          TextMappingSymsAddr.push_back(Address - SectionAddr);
        if (Name.startswith("$a"))
          TextMappingSymsAddr.push_back(Address - SectionAddr);
        if (Name.startswith("$t"))
          TextMappingSymsAddr.push_back(Address - SectionAddr);
      }
    }

    llvm::sort(DataMappingSymsAddr);
    llvm::sort(TextMappingSymsAddr);

    if (Obj->isELF() && Obj->getArch() == Triple::amdgcn) {
      // AMDGPU disassembler uses symbolizer for printing labels
      std::unique_ptr<MCRelocationInfo> RelInfo(
        TheTarget->createMCRelocationInfo(TripleName, Ctx));
      if (RelInfo) {
        std::unique_ptr<MCSymbolizer> Symbolizer(
          TheTarget->createMCSymbolizer(
            TripleName, nullptr, nullptr, &Symbols, &Ctx, std::move(RelInfo)));
        DisAsm->setSymbolizer(std::move(Symbolizer));
      }
    }

    StringRef SegmentName = "";
    if (const MachOObjectFile *MachO = dyn_cast<const MachOObjectFile>(Obj)) {
      DataRefImpl DR = Section.getRawDataRefImpl();
      SegmentName = MachO->getSectionFinalSegmentName(DR);
    }
    StringRef SectionName;
    error(Section.getName(SectionName));

    // If the section has no symbol at the start, just insert a dummy one.
    if (Symbols.empty() || std::get<0>(Symbols[0]) != 0) {
      Symbols.insert(
          Symbols.begin(),
          std::make_tuple(SectionAddr, SectionName,
                          Section.isText() ? ELF::STT_FUNC : ELF::STT_OBJECT));
    }

    SmallString<40> Comments;
    raw_svector_ostream CommentStream(Comments);

    StringRef BytesStr;
    error(Section.getContents(BytesStr));
    ArrayRef<uint8_t> Bytes = arrayRefFromStringRef(BytesStr);

    uint64_t VMAAdjustment = 0;
    if (shouldAdjustVA(Section))
      VMAAdjustment = AdjustVMA;

    uint64_t Size;
    uint64_t Index;
    bool PrintedSection = false;
    std::vector<RelocationRef> Rels = RelocMap[Section];
    std::vector<RelocationRef>::const_iterator RelCur = Rels.begin();
    std::vector<RelocationRef>::const_iterator RelEnd = Rels.end();
    // Disassemble symbol by symbol.
    for (unsigned SI = 0, SE = Symbols.size(); SI != SE; ++SI) {
      // Skip if --disassemble-functions is not empty and the symbol is not in
      // the list.
      if (!DisasmFuncsSet.empty() &&
          !DisasmFuncsSet.count(std::get<1>(Symbols[SI])))
        continue;

      uint64_t Start = std::get<0>(Symbols[SI]);

      // The end is the section end, the beginning of the next symbol, or
      // --stop-address.
      uint64_t End = std::min<uint64_t>(SectionAddr + SectSize, StopAddress);
      if (SI + 1 < SE)
        End = std::min(End, std::get<0>(Symbols[SI + 1]));
      if (Start >= End || Start >= StopAddress || End <= StartAddress)
        continue;
      Start -= SectionAddr;
      End -= SectionAddr;

      if (!PrintedSection) {
        PrintedSection = true;
        outs() << "Disassembly of section ";
        if (!SegmentName.empty())
          outs() << SegmentName << ",";
        outs() << SectionName << ':';
      }

      if (Obj->isELF() && Obj->getArch() == Triple::amdgcn) {
        if (std::get<2>(Symbols[SI]) == ELF::STT_AMDGPU_HSA_KERNEL) {
          // skip amd_kernel_code_t at the begining of kernel symbol (256 bytes)
          Start += 256;
        }
        if (SI == SE - 1 ||
            std::get<2>(Symbols[SI + 1]) == ELF::STT_AMDGPU_HSA_KERNEL) {
          // cut trailing zeroes at the end of kernel
          // cut up to 256 bytes
          const uint64_t EndAlign = 256;
          const auto Limit = End - (std::min)(EndAlign, End - Start);
          while (End > Limit &&
            *reinterpret_cast<const support::ulittle32_t*>(&Bytes[End - 4]) == 0)
            End -= 4;
        }
      }

      outs() << '\n';
      if (!NoLeadingAddr)
        outs() << format("%016" PRIx64 " ",
                         SectionAddr + Start + VMAAdjustment);

      StringRef SymbolName = std::get<1>(Symbols[SI]);
      if (Demangle)
        outs() << demangle(SymbolName) << ":\n";
      else
        outs() << SymbolName << ":\n";

      // Don't print raw contents of a virtual section. A virtual section
      // doesn't have any contents in the file.
      if (Section.isVirtual()) {
        outs() << "...\n";
        continue;
      }

#ifndef NDEBUG
      raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
#else
      raw_ostream &DebugOut = nulls();
#endif

      // Some targets (like WebAssembly) have a special prelude at the start
      // of each symbol.
      DisAsm->onSymbolStart(SymbolName, Size, Bytes.slice(Start, End - Start),
                            SectionAddr + Start, DebugOut, CommentStream);
      Start += Size;

      Index = Start;
      if (SectionAddr < StartAddress)
        Index = std::max<uint64_t>(Index, StartAddress - SectionAddr);

      // If there is a data symbol inside an ELF text section and we are
      // only disassembling text (applicable all architectures), we are in a
      // situation where we must print the data and not disassemble it.
      if (Obj->isELF() && std::get<2>(Symbols[SI]) == ELF::STT_OBJECT &&
          !DisassembleAll && Section.isText()) {
        dumpELFData(SectionAddr, Index, End, Bytes);
        Index = End;
      }

      bool CheckARMELFData = isArmElf(Obj) &&
                             std::get<2>(Symbols[SI]) != ELF::STT_OBJECT &&
                             !DisassembleAll;
      while (Index < End) {
        // AArch64 ELF binaries can interleave data and text in the same
        // section. We rely on the markers introduced to understand what we
        // need to dump. If the data marker is within a function, it is
        // denoted as a word/short etc.
        if (CheckARMELFData &&
            std::binary_search(DataMappingSymsAddr.begin(),
                               DataMappingSymsAddr.end(), Index)) {
          Index = dumpARMELFData(SectionAddr, Index, End, Obj, Bytes,
                                 TextMappingSymsAddr);
          continue;
        }

        // When -z or --disassemble-zeroes are given we always dissasemble
        // them. Otherwise we might want to skip zero bytes we see.
        if (!DisassembleZeroes) {
          uint64_t MaxOffset = End - Index;
          // For -reloc: print zero blocks patched by relocations, so that
          // relocations can be shown in the dump.
          if (RelCur != RelEnd)
            MaxOffset = RelCur->getOffset() - Index;

          if (size_t N =
                  countSkippableZeroBytes(Bytes.slice(Index, MaxOffset))) {
            outs() << "\t\t..." << '\n';
            Index += N;
            continue;
          }
        }

        // Disassemble a real instruction or a data when disassemble all is
        // provided
        MCInst Inst;
        bool Disassembled = DisAsm->getInstruction(
            Inst, Size, Bytes.slice(Index), SectionAddr + Index, DebugOut,
            CommentStream);
        if (Size == 0)
          Size = 1;

        PIP.printInst(
            *IP, Disassembled ? &Inst : nullptr, Bytes.slice(Index, Size),
            {SectionAddr + Index + VMAAdjustment, Section.getIndex()}, outs(),
            "", *STI, &SP, &Rels);
        outs() << CommentStream.str();
        Comments.clear();

        // Try to resolve the target of a call, tail call, etc. to a specific
        // symbol.
        if (MIA && (MIA->isCall(Inst) || MIA->isUnconditionalBranch(Inst) ||
                    MIA->isConditionalBranch(Inst))) {
          uint64_t Target;
          if (MIA->evaluateBranch(Inst, SectionAddr + Index, Size, Target)) {
            // In a relocatable object, the target's section must reside in
            // the same section as the call instruction or it is accessed
            // through a relocation.
            //
            // In a non-relocatable object, the target may be in any section.
            //
            // N.B. We don't walk the relocations in the relocatable case yet.
            auto *TargetSectionSymbols = &Symbols;
            if (!Obj->isRelocatableObject()) {
              auto It = llvm::bsearch(
                  SectionAddresses,
                  [=](const std::pair<uint64_t, SectionRef> &RHS) {
                    return Target < RHS.first;
                  });
              if (It != SectionAddresses.begin()) {
                --It;
                TargetSectionSymbols = &AllSymbols[It->second];
              } else {
                TargetSectionSymbols = &AbsoluteSymbols;
              }
            }

            // Find the last symbol in the section whose offset is less than
            // or equal to the target. If there isn't a section that contains
            // the target, find the nearest preceding absolute symbol.
            auto TargetSym = llvm::bsearch(
                *TargetSectionSymbols,
                [=](const std::tuple<uint64_t, StringRef, uint8_t> &RHS) {
                  return Target < std::get<0>(RHS);
                });
            if (TargetSym == TargetSectionSymbols->begin()) {
              TargetSectionSymbols = &AbsoluteSymbols;
              TargetSym = llvm::bsearch(
                  AbsoluteSymbols,
                  [=](const std::tuple<uint64_t, StringRef, uint8_t> &RHS) {
                    return Target < std::get<0>(RHS);
                  });
            }
            if (TargetSym != TargetSectionSymbols->begin()) {
              --TargetSym;
              uint64_t TargetAddress = std::get<0>(*TargetSym);
              StringRef TargetName = std::get<1>(*TargetSym);
              outs() << " <" << TargetName;
              uint64_t Disp = Target - TargetAddress;
              if (Disp)
                outs() << "+0x" << Twine::utohexstr(Disp);
              outs() << '>';
            }
          }
        }
        outs() << "\n";

        // Hexagon does this in pretty printer
        if (Obj->getArch() != Triple::hexagon) {
          // Print relocation for instruction.
          while (RelCur != RelEnd) {
            uint64_t Offset = RelCur->getOffset();
            // If this relocation is hidden, skip it.
            if (getHidden(*RelCur) || SectionAddr + Offset < StartAddress) {
              ++RelCur;
              continue;
            }

            // Stop when RelCur's offset is past the current instruction.
            if (Offset >= Index + Size)
              break;

            // When --adjust-vma is used, update the address printed.
            if (RelCur->getSymbol() != Obj->symbol_end()) {
              Expected<section_iterator> SymSI =
                  RelCur->getSymbol()->getSection();
              if (SymSI && *SymSI != Obj->section_end() &&
                  shouldAdjustVA(**SymSI))
                Offset += AdjustVMA;
            }

            printRelocation(*RelCur, SectionAddr + Offset,
                            Obj->getBytesInAddress());
            ++RelCur;
          }
        }

        Index += Size;
      }
    }
  }
}

static void disassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
  if (StartAddress > StopAddress)
    error("Start address should be less than stop address");

  const Target *TheTarget = getTarget(Obj);

  // Package up features to be passed to target/subtarget
  SubtargetFeatures Features = Obj->getFeatures();
  if (!MAttrs.empty())
    for (unsigned I = 0; I != MAttrs.size(); ++I)
      Features.AddFeature(MAttrs[I]);

  std::unique_ptr<const MCRegisterInfo> MRI(
      TheTarget->createMCRegInfo(TripleName));
  if (!MRI)
    report_error(Obj->getFileName(),
                 "no register info for target " + TripleName);

  // Set up disassembler.
  std::unique_ptr<const MCAsmInfo> AsmInfo(
      TheTarget->createMCAsmInfo(*MRI, TripleName));
  if (!AsmInfo)
    report_error(Obj->getFileName(),
                 "no assembly info for target " + TripleName);
  std::unique_ptr<const MCSubtargetInfo> STI(
      TheTarget->createMCSubtargetInfo(TripleName, MCPU, Features.getString()));
  if (!STI)
    report_error(Obj->getFileName(),
                 "no subtarget info for target " + TripleName);
  std::unique_ptr<const MCInstrInfo> MII(TheTarget->createMCInstrInfo());
  if (!MII)
    report_error(Obj->getFileName(),
                 "no instruction info for target " + TripleName);
  MCObjectFileInfo MOFI;
  MCContext Ctx(AsmInfo.get(), MRI.get(), &MOFI);
  // FIXME: for now initialize MCObjectFileInfo with default values
  MOFI.InitMCObjectFileInfo(Triple(TripleName), false, Ctx);

  std::unique_ptr<MCDisassembler> DisAsm(
      TheTarget->createMCDisassembler(*STI, Ctx));
  if (!DisAsm)
    report_error(Obj->getFileName(),
                 "no disassembler for target " + TripleName);

  std::unique_ptr<const MCInstrAnalysis> MIA(
      TheTarget->createMCInstrAnalysis(MII.get()));

  int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
  std::unique_ptr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
      Triple(TripleName), AsmPrinterVariant, *AsmInfo, *MII, *MRI));
  if (!IP)
    report_error(Obj->getFileName(),
                 "no instruction printer for target " + TripleName);
  IP->setPrintImmHex(PrintImmHex);

  PrettyPrinter &PIP = selectPrettyPrinter(Triple(TripleName));
  SourcePrinter SP(Obj, TheTarget->getName());

  for (StringRef Opt : DisassemblerOptions)
    if (!IP->applyTargetSpecificCLOption(Opt))
      error("Unrecognized disassembler option: " + Opt);

  disassembleObject(TheTarget, Obj, Ctx, DisAsm.get(), MIA.get(), IP.get(),
                    STI.get(), PIP, SP, InlineRelocs);
}

void printRelocations(const ObjectFile *Obj) {
  StringRef Fmt = Obj->getBytesInAddress() > 4 ? "%016" PRIx64 :
                                                 "%08" PRIx64;
  // Regular objdump doesn't print relocations in non-relocatable object
  // files.
  if (!Obj->isRelocatableObject())
    return;

  for (const SectionRef &Section : ToolSectionFilter(*Obj)) {
    if (Section.relocation_begin() == Section.relocation_end())
      continue;
    StringRef SecName;
    error(Section.getName(SecName));
    outs() << "RELOCATION RECORDS FOR [" << SecName << "]:\n";
    for (const RelocationRef &Reloc : Section.relocations()) {
      uint64_t Address = Reloc.getOffset();
      SmallString<32> RelocName;
      SmallString<32> ValueStr;
      if (Address < StartAddress || Address > StopAddress || getHidden(Reloc))
        continue;
      Reloc.getTypeName(RelocName);
      error(getRelocationValueString(Reloc, ValueStr));
      outs() << format(Fmt.data(), Address) << " " << RelocName << " "
             << ValueStr << "\n";
    }
    outs() << "\n";
  }
}

void printDynamicRelocations(const ObjectFile *Obj) {
  // For the moment, this option is for ELF only
  if (!Obj->isELF())
    return;

  const auto *Elf = dyn_cast<ELFObjectFileBase>(Obj);
  if (!Elf || Elf->getEType() != ELF::ET_DYN) {
    error("not a dynamic object");
    return;
  }

  std::vector<SectionRef> DynRelSec = Obj->dynamic_relocation_sections();
  if (DynRelSec.empty())
    return;

  outs() << "DYNAMIC RELOCATION RECORDS\n";
  StringRef Fmt = Obj->getBytesInAddress() > 4 ? "%016" PRIx64 : "%08" PRIx64;
  for (const SectionRef &Section : DynRelSec) {
    if (Section.relocation_begin() == Section.relocation_end())
      continue;
    for (const RelocationRef &Reloc : Section.relocations()) {
      uint64_t Address = Reloc.getOffset();
      SmallString<32> RelocName;
      SmallString<32> ValueStr;
      Reloc.getTypeName(RelocName);
      error(getRelocationValueString(Reloc, ValueStr));
      outs() << format(Fmt.data(), Address) << " " << RelocName << " "
             << ValueStr << "\n";
    }
  }
}

// Returns true if we need to show LMA column when dumping section headers. We
// show it only when the platform is ELF and either we have at least one section
// whose VMA and LMA are different and/or when --show-lma flag is used.
static bool shouldDisplayLMA(const ObjectFile *Obj) {
  if (!Obj->isELF())
    return false;
  for (const SectionRef &S : ToolSectionFilter(*Obj))
    if (S.getAddress() != getELFSectionLMA(S))
      return true;
  return ShowLMA;
}

void printSectionHeaders(const ObjectFile *Obj) {
  bool HasLMAColumn = shouldDisplayLMA(Obj);
  if (HasLMAColumn)
    outs() << "Sections:\n"
              "Idx Name          Size     VMA              LMA              "
              "Type\n";
  else
    outs() << "Sections:\n"
              "Idx Name          Size     VMA          Type\n";

  for (const SectionRef &Section : ToolSectionFilter(*Obj)) {
    StringRef Name;
    error(Section.getName(Name));
    uint64_t VMA = Section.getAddress();
    if (shouldAdjustVA(Section))
      VMA += AdjustVMA;

    uint64_t Size = Section.getSize();
    bool Text = Section.isText();
    bool Data = Section.isData();
    bool BSS = Section.isBSS();
    std::string Type = (std::string(Text ? "TEXT " : "") +
                        (Data ? "DATA " : "") + (BSS ? "BSS" : ""));

    if (HasLMAColumn)
      outs() << format("%3d %-13s %08" PRIx64 " %016" PRIx64 " %016" PRIx64
                       " %s\n",
                       (unsigned)Section.getIndex(), Name.str().c_str(), Size,
                       VMA, getELFSectionLMA(Section), Type.c_str());
    else
      outs() << format("%3d %-13s %08" PRIx64 " %016" PRIx64 " %s\n",
                       (unsigned)Section.getIndex(), Name.str().c_str(), Size,
                       VMA, Type.c_str());
  }
  outs() << "\n";
}

void printSectionContents(const ObjectFile *Obj) {
  for (const SectionRef &Section : ToolSectionFilter(*Obj)) {
    StringRef Name;
    StringRef Contents;
    error(Section.getName(Name));
    uint64_t BaseAddr = Section.getAddress();
    uint64_t Size = Section.getSize();
    if (!Size)
      continue;

    outs() << "Contents of section " << Name << ":\n";
    if (Section.isBSS()) {
      outs() << format("<skipping contents of bss section at [%04" PRIx64
                       ", %04" PRIx64 ")>\n",
                       BaseAddr, BaseAddr + Size);
      continue;
    }

    error(Section.getContents(Contents));

    // Dump out the content as hex and printable ascii characters.
    for (std::size_t Addr = 0, End = Contents.size(); Addr < End; Addr += 16) {
      outs() << format(" %04" PRIx64 " ", BaseAddr + Addr);
      // Dump line of hex.
      for (std::size_t I = 0; I < 16; ++I) {
        if (I != 0 && I % 4 == 0)
          outs() << ' ';
        if (Addr + I < End)
          outs() << hexdigit((Contents[Addr + I] >> 4) & 0xF, true)
                 << hexdigit(Contents[Addr + I] & 0xF, true);
        else
          outs() << "  ";
      }
      // Print ascii.
      outs() << "  ";
      for (std::size_t I = 0; I < 16 && Addr + I < End; ++I) {
        if (isPrint(static_cast<unsigned char>(Contents[Addr + I]) & 0xFF))
          outs() << Contents[Addr + I];
        else
          outs() << ".";
      }
      outs() << "\n";
    }
  }
}

void printSymbolTable(const ObjectFile *O, StringRef ArchiveName,
                      StringRef ArchitectureName) {
  outs() << "SYMBOL TABLE:\n";

  if (const COFFObjectFile *Coff = dyn_cast<const COFFObjectFile>(O)) {
    printCOFFSymbolTable(Coff);
    return;
  }

  const StringRef FileName = O->getFileName();
  for (auto I = O->symbol_begin(), E = O->symbol_end(); I != E; ++I) {
    // Skip printing the special zero symbol when dumping an ELF file.
    // This makes the output consistent with the GNU objdump.
    if (I == O->symbol_begin() && isa<ELFObjectFileBase>(O))
      continue;

    const SymbolRef &Symbol = *I;
    uint64_t Address = unwrapOrError(Symbol.getAddress(), ArchiveName, FileName,
                                     ArchitectureName);
    if ((Address < StartAddress) || (Address > StopAddress))
      continue;
    SymbolRef::Type Type = unwrapOrError(Symbol.getType(), ArchiveName,
                                         FileName, ArchitectureName);
    uint32_t Flags = Symbol.getFlags();
    section_iterator Section = unwrapOrError(Symbol.getSection(), ArchiveName,
                                             FileName, ArchitectureName);
    StringRef Name;
    if (Type == SymbolRef::ST_Debug && Section != O->section_end())
      Section->getName(Name);
    else
      Name = unwrapOrError(Symbol.getName(), ArchiveName, FileName,
                           ArchitectureName);

    bool Global = Flags & SymbolRef::SF_Global;
    bool Weak = Flags & SymbolRef::SF_Weak;
    bool Absolute = Flags & SymbolRef::SF_Absolute;
    bool Common = Flags & SymbolRef::SF_Common;
    bool Hidden = Flags & SymbolRef::SF_Hidden;

    char GlobLoc = ' ';
    if (Type != SymbolRef::ST_Unknown)
      GlobLoc = Global ? 'g' : 'l';
    char Debug = (Type == SymbolRef::ST_Debug || Type == SymbolRef::ST_File)
                 ? 'd' : ' ';
    char FileFunc = ' ';
    if (Type == SymbolRef::ST_File)
      FileFunc = 'f';
    else if (Type == SymbolRef::ST_Function)
      FileFunc = 'F';
    else if (Type == SymbolRef::ST_Data)
      FileFunc = 'O';

    const char *Fmt = O->getBytesInAddress() > 4 ? "%016" PRIx64 :
                                                   "%08" PRIx64;

    outs() << format(Fmt, Address) << " "
           << GlobLoc // Local -> 'l', Global -> 'g', Neither -> ' '
           << (Weak ? 'w' : ' ') // Weak?
           << ' ' // Constructor. Not supported yet.
           << ' ' // Warning. Not supported yet.
           << ' ' // Indirect reference to another symbol.
           << Debug // Debugging (d) or dynamic (D) symbol.
           << FileFunc // Name of function (F), file (f) or object (O).
           << ' ';
    if (Absolute) {
      outs() << "*ABS*";
    } else if (Common) {
      outs() << "*COM*";
    } else if (Section == O->section_end()) {
      outs() << "*UND*";
    } else {
      if (const MachOObjectFile *MachO =
          dyn_cast<const MachOObjectFile>(O)) {
        DataRefImpl DR = Section->getRawDataRefImpl();
        StringRef SegmentName = MachO->getSectionFinalSegmentName(DR);
        outs() << SegmentName << ",";
      }
      StringRef SectionName;
      error(Section->getName(SectionName));
      outs() << SectionName;
    }

    outs() << '\t';
    if (Common || isa<ELFObjectFileBase>(O)) {
      uint64_t Val =
          Common ? Symbol.getAlignment() : ELFSymbolRef(Symbol).getSize();
      outs() << format("\t %08" PRIx64 " ", Val);
    }

    if (Hidden)
      outs() << ".hidden ";

    if (Demangle)
      outs() << demangle(Name) << '\n';
    else
      outs() << Name << '\n';
  }
}

static void printUnwindInfo(const ObjectFile *O) {
  outs() << "Unwind info:\n\n";

  if (const COFFObjectFile *Coff = dyn_cast<COFFObjectFile>(O))
    printCOFFUnwindInfo(Coff);
  else if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(O))
    printMachOUnwindInfo(MachO);
  else
    // TODO: Extract DWARF dump tool to objdump.
    WithColor::error(errs(), ToolName)
        << "This operation is only currently supported "
           "for COFF and MachO object files.\n";
}

/// Dump the raw contents of the __clangast section so the output can be piped
/// into llvm-bcanalyzer.
void printRawClangAST(const ObjectFile *Obj) {
  if (outs().is_displayed()) {
    WithColor::error(errs(), ToolName)
        << "The -raw-clang-ast option will dump the raw binary contents of "
           "the clang ast section.\n"
           "Please redirect the output to a file or another program such as "
           "llvm-bcanalyzer.\n";
    return;
  }

  StringRef ClangASTSectionName("__clangast");
  if (isa<COFFObjectFile>(Obj)) {
    ClangASTSectionName = "clangast";
  }

  Optional<object::SectionRef> ClangASTSection;
  for (auto Sec : ToolSectionFilter(*Obj)) {
    StringRef Name;
    Sec.getName(Name);
    if (Name == ClangASTSectionName) {
      ClangASTSection = Sec;
      break;
    }
  }
  if (!ClangASTSection)
    return;

  StringRef ClangASTContents;
  error(ClangASTSection.getValue().getContents(ClangASTContents));
  outs().write(ClangASTContents.data(), ClangASTContents.size());
}

static void printFaultMaps(const ObjectFile *Obj) {
  StringRef FaultMapSectionName;

  if (isa<ELFObjectFileBase>(Obj)) {
    FaultMapSectionName = ".llvm_faultmaps";
  } else if (isa<MachOObjectFile>(Obj)) {
    FaultMapSectionName = "__llvm_faultmaps";
  } else {
    WithColor::error(errs(), ToolName)
        << "This operation is only currently supported "
           "for ELF and Mach-O executable files.\n";
    return;
  }

  Optional<object::SectionRef> FaultMapSection;

  for (auto Sec : ToolSectionFilter(*Obj)) {
    StringRef Name;
    Sec.getName(Name);
    if (Name == FaultMapSectionName) {
      FaultMapSection = Sec;
      break;
    }
  }

  outs() << "FaultMap table:\n";

  if (!FaultMapSection.hasValue()) {
    outs() << "<not found>\n";
    return;
  }

  StringRef FaultMapContents;
  error(FaultMapSection.getValue().getContents(FaultMapContents));

  FaultMapParser FMP(FaultMapContents.bytes_begin(),
                     FaultMapContents.bytes_end());

  outs() << FMP;
}

static void printPrivateFileHeaders(const ObjectFile *O, bool OnlyFirst) {
  if (O->isELF()) {
    printELFFileHeader(O);
    printELFDynamicSection(O);
    printELFSymbolVersionInfo(O);
    return;
  }
  if (O->isCOFF())
    return printCOFFFileHeader(O);
  if (O->isWasm())
    return printWasmFileHeader(O);
  if (O->isMachO()) {
    printMachOFileHeader(O);
    if (!OnlyFirst)
      printMachOLoadCommands(O);
    return;
  }
  report_error(O->getFileName(), "Invalid/Unsupported object file format");
}

static void printFileHeaders(const ObjectFile *O) {
  if (!O->isELF() && !O->isCOFF())
    report_error(O->getFileName(), "Invalid/Unsupported object file format");

  Triple::ArchType AT = O->getArch();
  outs() << "architecture: " << Triple::getArchTypeName(AT) << "\n";
  uint64_t Address = unwrapOrError(O->getStartAddress(), O->getFileName());

  StringRef Fmt = O->getBytesInAddress() > 4 ? "%016" PRIx64 : "%08" PRIx64;
  outs() << "start address: "
         << "0x" << format(Fmt.data(), Address) << "\n\n";
}

static void printArchiveChild(StringRef Filename, const Archive::Child &C) {
  Expected<sys::fs::perms> ModeOrErr = C.getAccessMode();
  if (!ModeOrErr) {
    WithColor::error(errs(), ToolName) << "ill-formed archive entry.\n";
    consumeError(ModeOrErr.takeError());
    return;
  }
  sys::fs::perms Mode = ModeOrErr.get();
  outs() << ((Mode & sys::fs::owner_read) ? "r" : "-");
  outs() << ((Mode & sys::fs::owner_write) ? "w" : "-");
  outs() << ((Mode & sys::fs::owner_exe) ? "x" : "-");
  outs() << ((Mode & sys::fs::group_read) ? "r" : "-");
  outs() << ((Mode & sys::fs::group_write) ? "w" : "-");
  outs() << ((Mode & sys::fs::group_exe) ? "x" : "-");
  outs() << ((Mode & sys::fs::others_read) ? "r" : "-");
  outs() << ((Mode & sys::fs::others_write) ? "w" : "-");
  outs() << ((Mode & sys::fs::others_exe) ? "x" : "-");

  outs() << " ";

  outs() << format("%d/%d %6" PRId64 " ", unwrapOrError(C.getUID(), Filename),
                   unwrapOrError(C.getGID(), Filename),
                   unwrapOrError(C.getRawSize(), Filename));

  StringRef RawLastModified = C.getRawLastModified();
  unsigned Seconds;
  if (RawLastModified.getAsInteger(10, Seconds))
    outs() << "(date: \"" << RawLastModified
           << "\" contains non-decimal chars) ";
  else {
    // Since ctime(3) returns a 26 character string of the form:
    // "Sun Sep 16 01:03:52 1973\n\0"
    // just print 24 characters.
    time_t t = Seconds;
    outs() << format("%.24s ", ctime(&t));
  }

  StringRef Name = "";
  Expected<StringRef> NameOrErr = C.getName();
  if (!NameOrErr) {
    consumeError(NameOrErr.takeError());
    Name = unwrapOrError(C.getRawName(), Filename);
  } else {
    Name = NameOrErr.get();
  }
  outs() << Name << "\n";
}

static void dumpObject(ObjectFile *O, const Archive *A = nullptr,
                       const Archive::Child *C = nullptr) {
  // Avoid other output when using a raw option.
  if (!RawClangAST) {
    outs() << '\n';
    if (A)
      outs() << A->getFileName() << "(" << O->getFileName() << ")";
    else
      outs() << O->getFileName();
    outs() << ":\tfile format " << O->getFileFormatName() << "\n\n";
  }

  StringRef ArchiveName = A ? A->getFileName() : "";
  if (FileHeaders)
    printFileHeaders(O);
  if (ArchiveHeaders && !MachOOpt && C)
    printArchiveChild(ArchiveName, *C);
  if (Disassemble)
    disassembleObject(O, Relocations);
  if (Relocations && !Disassemble)
    printRelocations(O);
  if (DynamicRelocations)
    printDynamicRelocations(O);
  if (SectionHeaders)
    printSectionHeaders(O);
  if (SectionContents)
    printSectionContents(O);
  if (SymbolTable)
    printSymbolTable(O, ArchiveName);
  if (UnwindInfo)
    printUnwindInfo(O);
  if (PrivateHeaders || FirstPrivateHeader)
    printPrivateFileHeaders(O, FirstPrivateHeader);
  if (ExportsTrie)
    printExportsTrie(O);
  if (Rebase)
    printRebaseTable(O);
  if (Bind)
    printBindTable(O);
  if (LazyBind)
    printLazyBindTable(O);
  if (WeakBind)
    printWeakBindTable(O);
  if (RawClangAST)
    printRawClangAST(O);
  if (FaultMapSection)
    printFaultMaps(O);
  if (DwarfDumpType != DIDT_Null) {
    std::unique_ptr<DIContext> DICtx = DWARFContext::create(*O);
    // Dump the complete DWARF structure.
    DIDumpOptions DumpOpts;
    DumpOpts.DumpType = DwarfDumpType;
    DICtx->dump(outs(), DumpOpts);
  }
}

static void dumpObject(const COFFImportFile *I, const Archive *A,
                       const Archive::Child *C = nullptr) {
  StringRef ArchiveName = A ? A->getFileName() : "";

  // Avoid other output when using a raw option.
  if (!RawClangAST)
    outs() << '\n'
           << ArchiveName << "(" << I->getFileName() << ")"
           << ":\tfile format COFF-import-file"
           << "\n\n";

  if (ArchiveHeaders && !MachOOpt && C)
    printArchiveChild(ArchiveName, *C);
  if (SymbolTable)
    printCOFFSymbolTable(I);
}

/// Dump each object file in \a a;
static void dumpArchive(const Archive *A) {
  Error Err = Error::success();
  for (auto &C : A->children(Err)) {
    Expected<std::unique_ptr<Binary>> ChildOrErr = C.getAsBinary();
    if (!ChildOrErr) {
      if (auto E = isNotObjectErrorInvalidFileType(ChildOrErr.takeError()))
        report_error(std::move(E), A->getFileName(), C);
      continue;
    }
    if (ObjectFile *O = dyn_cast<ObjectFile>(&*ChildOrErr.get()))
      dumpObject(O, A, &C);
    else if (COFFImportFile *I = dyn_cast<COFFImportFile>(&*ChildOrErr.get()))
      dumpObject(I, A, &C);
    else
      report_error(errorCodeToError(object_error::invalid_file_type),
                   A->getFileName());
  }
  if (Err)
    report_error(std::move(Err), A->getFileName());
}

/// Open file and figure out how to dump it.
static void dumpInput(StringRef file) {
  // If we are using the Mach-O specific object file parser, then let it parse
  // the file and process the command line options.  So the -arch flags can
  // be used to select specific slices, etc.
  if (MachOOpt) {
    parseInputMachO(file);
    return;
  }

  // Attempt to open the binary.
  OwningBinary<Binary> OBinary = unwrapOrError(createBinary(file), file);
  Binary &Binary = *OBinary.getBinary();

  if (Archive *A = dyn_cast<Archive>(&Binary))
    dumpArchive(A);
  else if (ObjectFile *O = dyn_cast<ObjectFile>(&Binary))
    dumpObject(O);
  else if (MachOUniversalBinary *UB = dyn_cast<MachOUniversalBinary>(&Binary))
    parseInputMachO(UB);
  else
    report_error(errorCodeToError(object_error::invalid_file_type), file);
}
} // namespace llvm

int main(int argc, char **argv) {
  using namespace llvm;
  InitLLVM X(argc, argv);

  // Initialize targets and assembly printers/parsers.
  InitializeAllTargetInfos();
  InitializeAllTargetMCs();
  InitializeAllDisassemblers();

  // Register the target printer for --version.
  cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);

  cl::ParseCommandLineOptions(argc, argv, "llvm object file dumper\n");

  ToolName = argv[0];

  // Defaults to a.out if no filenames specified.
  if (InputFilenames.empty())
    InputFilenames.push_back("a.out");

  if (AllHeaders)
    ArchiveHeaders = FileHeaders = PrivateHeaders = Relocations =
        SectionHeaders = SymbolTable = true;

  if (DisassembleAll || PrintSource || PrintLines)
    Disassemble = true;

  if (!ArchiveHeaders && !Disassemble && DwarfDumpType == DIDT_Null &&
      !DynamicRelocations && !FileHeaders && !PrivateHeaders && !RawClangAST &&
      !Relocations && !SectionHeaders && !SectionContents && !SymbolTable &&
      !UnwindInfo && !FaultMapSection &&
      !(MachOOpt &&
        (Bind || DataInCode || DylibId || DylibsUsed || ExportsTrie ||
         FirstPrivateHeader || IndirectSymbols || InfoPlist || LazyBind ||
         LinkOptHints || ObjcMetaData || Rebase || UniversalHeaders ||
         WeakBind || !FilterSections.empty()))) {
    cl::PrintHelpMessage();
    return 2;
  }

  DisasmFuncsSet.insert(DisassembleFunctions.begin(),
                        DisassembleFunctions.end());

  llvm::for_each(InputFilenames, dumpInput);

  return EXIT_SUCCESS;
}