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llvm-mirror/tools/llvm-objdump/llvm-objdump.cpp
Michael Trent d317d94f80 llvm-objdump should ignore Mach-O stab symbols for disassembly. 
Summary:
llvm-objdump will commonly error out when disassembling a Mach-O binary with
stab symbols, or when printing a Mach-O symbol table that includesstab symbols.
That is because the Mach-O N_OSO symbol has been modified to include the
bottom 8-bit value of the Mach-O's cpusubtype value in the section field. In
general, one cannot blindly assume a stab symbol's section field is valid
unless one has actually consulted the specification for the specific stab.

Since objdump mostly just walks the symbol table to get mnemonics for code
disassembly it's best for objdump to just ignore stab symbols. llvm-nm will
do a more complete and correct job of displaying Mach-O symbol table contents.

Reviewers: pete, lhames, ab, thegameg, jhenderson, MaskRay

Reviewed By: thegameg, MaskRay

Subscribers: MaskRay, rupprecht, seiya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D71394
2019-12-20 15:20:53 -08:00

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//===-- 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/SetOperations.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/MC/MCTargetOptions.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/FormatVariadic.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 {
cl::OptionCategory ObjdumpCat("llvm-objdump Options");
// MachO specific
extern cl::OptionCategory MachOCat;
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<uint64_t> AdjustVMA(
"adjust-vma",
cl::desc("Increase the displayed address by the specified offset"),
cl::value_desc("offset"), cl::init(0), cl::cat(ObjdumpCat));
static cl::opt<bool>
AllHeaders("all-headers",
cl::desc("Display all available header information"),
cl::cat(ObjdumpCat));
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::cat(ObjdumpCat));
cl::opt<bool> ArchiveHeaders("archive-headers",
cl::desc("Display archive header information"),
cl::cat(ObjdumpCat));
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), cl::cat(ObjdumpCat));
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"),
cl::cat(ObjdumpCat));
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"),
cl::cat(ObjdumpCat));
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. "
"Accept demangled names when --demangle is "
"specified, otherwise accept mangled names"),
cl::cat(ObjdumpCat));
static cl::opt<bool> DisassembleZeroes(
"disassemble-zeroes",
cl::desc("Do not skip blocks of zeroes when disassembling"),
cl::cat(ObjdumpCat));
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,
cl::cat(ObjdumpCat));
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")),
cl::cat(ObjdumpCat));
static cl::opt<bool> DynamicRelocations(
"dynamic-reloc",
cl::desc("Display the dynamic relocation entries in the file"),
cl::cat(ObjdumpCat));
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"),
cl::cat(ObjdumpCat));
static cl::opt<bool>
FileHeaders("file-headers",
cl::desc("Display the contents of the overall file header"),
cl::cat(ObjdumpCat));
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"),
cl::cat(ObjdumpCat));
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,
cl::cat(ObjdumpCat));
static cl::opt<bool>
PrintLines("line-numbers",
cl::desc("Display source line numbers with "
"disassembly. Implies disassemble object"),
cl::cat(ObjdumpCat));
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"),
cl::cat(ObjdumpCat));
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::cat(ObjdumpCat));
cl::list<std::string> MAttrs("mattr", cl::CommaSeparated,
cl::desc("Target specific attributes"),
cl::value_desc("a1,+a2,-a3,..."),
cl::cat(ObjdumpCat));
cl::opt<bool> NoShowRawInsn("no-show-raw-insn",
cl::desc("When disassembling "
"instructions, do not print "
"the instruction bytes."),
cl::cat(ObjdumpCat));
cl::opt<bool> NoLeadingAddr("no-leading-addr",
cl::desc("Print no leading address"),
cl::cat(ObjdumpCat));
static cl::opt<bool> RawClangAST(
"raw-clang-ast",
cl::desc("Dump the raw binary contents of the clang AST section"),
cl::cat(ObjdumpCat));
cl::opt<bool>
Relocations("reloc", cl::desc("Display the relocation entries in the file"),
cl::cat(ObjdumpCat));
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::cat(ObjdumpCat));
cl::opt<bool> PrivateHeaders("private-headers",
cl::desc("Display format specific file headers"),
cl::cat(ObjdumpCat));
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"),
cl::cat(ObjdumpCat));
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."),
cl::cat(ObjdumpCat));
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"),
cl::cat(ObjdumpCat));
static cl::opt<bool> PrintSource(
"source",
cl::desc(
"Display source inlined with disassembly. Implies disassemble object"),
cl::cat(ObjdumpCat));
static cl::alias PrintSourceShort("S", cl::desc("Alias for -source"),
cl::NotHidden, cl::Grouping,
cl::aliasopt(PrintSource));
static cl::opt<uint64_t>
StartAddress("start-address", cl::desc("Disassemble beginning at address"),
cl::value_desc("address"), cl::init(0), cl::cat(ObjdumpCat));
static cl::opt<uint64_t> StopAddress("stop-address",
cl::desc("Stop disassembly at address"),
cl::value_desc("address"),
cl::init(UINT64_MAX), cl::cat(ObjdumpCat));
cl::opt<bool> SymbolTable("syms", cl::desc("Display the symbol table"),
cl::cat(ObjdumpCat));
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::cat(ObjdumpCat));
cl::opt<bool> UnwindInfo("unwind-info", cl::desc("Display unwind information"),
cl::cat(ObjdumpCat));
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"),
cl::cat(ObjdumpCat));
static cl::alias WideShort("w", cl::Grouping, cl::aliasopt(Wide));
static cl::extrahelp
HelpResponse("\nPass @FILE as argument to read options from FILE.\n");
static StringSet<> DisasmFuncsSet;
static StringSet<> FoundSectionSet;
static StringRef ToolName;
typedef std::vector<std::tuple<uint64_t, StringRef, uint8_t>> SectionSymbolsTy;
namespace {
struct FilterResult {
// True if the section should not be skipped.
bool Keep;
// True if the index counter should be incremented, even if the section should
// be skipped. For example, sections may be skipped if they are not included
// in the --section flag, but we still want those to count toward the section
// count.
bool IncrementIndex;
};
} // namespace
static FilterResult checkSectionFilter(object::SectionRef S) {
if (FilterSections.empty())
return {/*Keep=*/true, /*IncrementIndex=*/true};
Expected<StringRef> SecNameOrErr = S.getName();
if (!SecNameOrErr) {
consumeError(SecNameOrErr.takeError());
return {/*Keep=*/false, /*IncrementIndex=*/false};
}
StringRef SecName = *SecNameOrErr;
// StringSet does not allow empty key so avoid adding sections with
// no name (such as the section with index 0) here.
if (!SecName.empty())
FoundSectionSet.insert(SecName);
// Only show the section if it's in the FilterSections list, but always
// increment so the indexing is stable.
return {/*Keep=*/is_contained(FilterSections, SecName),
/*IncrementIndex=*/true};
}
SectionFilter ToolSectionFilter(object::ObjectFile const &O, uint64_t *Idx) {
// Start at UINT64_MAX so that the first index returned after an increment is
// zero (after the unsigned wrap).
if (Idx)
*Idx = UINT64_MAX;
return SectionFilter(
[Idx](object::SectionRef S) {
FilterResult Result = checkSectionFilter(S);
if (Idx != nullptr && Result.IncrementIndex)
*Idx += 1;
return Result.Keep;
},
O);
}
std::string getFileNameForError(const object::Archive::Child &C,
unsigned Index) {
Expected<StringRef> NameOrErr = C.getName();
if (NameOrErr)
return NameOrErr.get();
// If we have an error getting the name then we print the index of the archive
// member. Since we are already in an error state, we just ignore this error.
consumeError(NameOrErr.takeError());
return "<file index: " + std::to_string(Index) + ">";
}
void reportWarning(Twine Message, StringRef File) {
// Output order between errs() and outs() matters especially for archive
// files where the output is per member object.
outs().flush();
WithColor::warning(errs(), ToolName)
<< "'" << File << "': " << Message << "\n";
errs().flush();
}
LLVM_ATTRIBUTE_NORETURN void reportError(StringRef File, Twine Message) {
WithColor::error(errs(), ToolName) << "'" << File << "': " << Message << "\n";
exit(1);
}
LLVM_ATTRIBUTE_NORETURN void reportError(Error E, StringRef FileName,
StringRef ArchiveName,
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);
}
static void reportCmdLineWarning(Twine Message) {
WithColor::warning(errs(), ToolName) << Message << "\n";
}
LLVM_ATTRIBUTE_NORETURN static void reportCmdLineError(Twine Message) {
WithColor::error(errs(), ToolName) << Message << "\n";
exit(1);
}
static void warnOnNoMatchForSections() {
SetVector<StringRef> MissingSections;
for (StringRef S : FilterSections) {
if (FoundSectionSet.count(S))
return;
// User may specify a unnamed section. Don't warn for it.
if (!S.empty())
MissingSections.insert(S);
}
// Warn only if no section in FilterSections is matched.
for (StringRef S : MissingSections)
reportCmdLineWarning("section '" + S +
"' mentioned in a -j/--section option, but not "
"found in any input file");
}
static const Target *getTarget(const ObjectFile *Obj) {
// Figure out the target triple.
Triple TheTriple("unknown-unknown-unknown");
if (TripleName.empty()) {
TheTriple = Obj->makeTriple();
} else {
TheTriple.setTriple(Triple::normalize(TripleName));
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)
reportError(Obj->getFileName(), "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;
// Keep track of missing sources.
StringSet<> MissingSources;
// Only emit 'no debug info' warning once.
bool WarnedNoDebugInfo;
private:
bool cacheSource(const DILineInfo& LineInfoFile);
public:
SourcePrinter() = default;
SourcePrinter(const ObjectFile *Obj, StringRef DefaultArch)
: Obj(Obj), WarnedNoDebugInfo(false) {
symbolize::LLVMSymbolizer::Options SymbolizerOpts;
SymbolizerOpts.PrintFunctions = DILineInfoSpecifier::FunctionNameKind::None;
SymbolizerOpts.Demangle = false;
SymbolizerOpts.DefaultArch = DefaultArch;
Symbolizer.reset(new symbolize::LLVMSymbolizer(SymbolizerOpts));
}
virtual ~SourcePrinter() = default;
virtual void printSourceLine(raw_ostream &OS,
object::SectionedAddress Address,
StringRef ObjectFilename,
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) {
if (MissingSources.insert(LineInfo.FileName).second)
reportWarning("failed to find source " + LineInfo.FileName,
Obj->getFileName());
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 ObjectFilename,
StringRef Delimiter) {
if (!Symbolizer)
return;
DILineInfo LineInfo = DILineInfo();
auto ExpectedLineInfo = Symbolizer->symbolizeCode(*Obj, Address);
std::string ErrorMessage;
if (!ExpectedLineInfo)
ErrorMessage = toString(ExpectedLineInfo.takeError());
else
LineInfo = *ExpectedLineInfo;
if (LineInfo.FileName == DILineInfo::BadString) {
if (!WarnedNoDebugInfo) {
std::string Warning =
"failed to parse debug information for " + ObjectFilename.str();
if (!ErrorMessage.empty())
Warning += ": " + ErrorMessage;
reportWarning(Warning, ObjectFilename);
WarnedNoDebugInfo = true;
}
return;
}
if (LineInfo.Line == 0 || ((OldLineInfo.Line == LineInfo.Line) &&
(OldLineInfo.FileName == LineInfo.FileName)))
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()) {
reportWarning(
formatv(
"debug info line number {0} exceeds the number of lines in {1}",
LineInfo.Line, LineInfo.FileName),
ObjectFilename);
return;
}
// Vector begins at 0, line numbers are non-zero
OS << Delimiter << LineBuffer->second[LineInfo.Line - 1] << '\n';
}
}
OldLineInfo = LineInfo;
}
static bool isAArch64Elf(const ObjectFile *Obj) {
const auto *Elf = dyn_cast<ELFObjectFileBase>(Obj);
return Elf && Elf->getEMachine() == ELF::EM_AARCH64;
}
static bool isArmElf(const ObjectFile *Obj) {
const auto *Elf = dyn_cast<ELFObjectFileBase>(Obj);
return Elf && Elf->getEMachine() == ELF::EM_ARM;
}
static bool hasMappingSymbols(const ObjectFile *Obj) {
return isArmElf(Obj) || isAArch64Elf(Obj);
}
static void printRelocation(StringRef FileName, const RelocationRef &Rel,
uint64_t Address, bool Is64Bits) {
StringRef Fmt = Is64Bits ? "\t\t%016" PRIx64 ": " : "\t\t\t%08" PRIx64 ": ";
SmallString<16> Name;
SmallString<32> Val;
Rel.getTypeName(Name);
if (Error E = getRelocationValueString(Rel, Val))
reportError(std::move(E), FileName);
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, StringRef ObjectFilename,
std::vector<RelocationRef> *Rels = nullptr) {
if (SP && (PrintSource || PrintLines))
SP->printSourceLine(OS, Address, ObjectFilename);
size_t Start = OS.tell();
if (!NoLeadingAddr)
OS << format("%8" PRIx64 ":", Address.Address);
if (!NoShowRawInsn) {
OS << ' ';
dumpBytes(Bytes, OS);
}
// 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 = OS.tell() - Start;
OS.indent(Column < TabStop - 1 ? TabStop - 1 - Column : 7 - Column % 8);
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,
StringRef ObjectFilename,
std::vector<RelocationRef> *Rels) override {
if (SP && (PrintSource || PrintLines))
SP->printSourceLine(OS, Address, ObjectFilename, "");
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(ObjectFilename, *RelCur, Address.Address, false);
return;
}
++RelCur;
}
};
while (!HeadTail.first.empty()) {
OS << Separator;
Separator = "\n";
if (SP && (PrintSource || PrintLines))
SP->printSourceLine(OS, Address, ObjectFilename, "");
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,
StringRef ObjectFilename,
std::vector<RelocationRef> *Rels) override {
if (SP && (PrintSource || PrintLines))
SP->printSourceLine(OS, Address, ObjectFilename);
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 " ",
support::endian::read32<support::little>(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) {
// D should be casted to uint32_t here as it is passed by format to
// snprintf as vararg.
for (uint32_t D : makeArrayRef(
reinterpret_cast<const support::little32_t *>(Bytes.data()),
Bytes.size() / 4))
OS << format(" %08" PRIX32, D);
} else {
for (unsigned char B : Bytes)
OS << format(" %02" PRIX8, B);
}
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,
StringRef ObjectFilename,
std::vector<RelocationRef> *Rels) override {
if (SP && (PrintSource || PrintLines))
SP->printSourceLine(OS, Address, ObjectFilename);
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_SECTION)
continue;
uint64_t Address = unwrapOrError(Symbol.getAddress(), Obj->getFileName());
// ELFSymbolRef::getAddress() returns size instead of value for common
// symbols which is not desirable for disassembly output. Overriding.
if (SymbolType == ELF::STT_COMMON)
Address = Obj->getSymbol(Symbol.getRawDataRefImpl())->st_value;
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()) {
Expected<StringRef> SecNameOrErr = Section.getName();
if (!SecNameOrErr) {
consumeError(SecNameOrErr.takeError());
continue;
}
if (*SecNameOrErr == ".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;
uint64_t I = (uint64_t)-1;
for (SectionRef Sec : Obj.sections()) {
++I;
Expected<section_iterator> RelocatedOrErr = Sec.getRelocatedSection();
if (!RelocatedOrErr)
reportError(Obj.getFileName(),
"section (" + Twine(I) +
"): failed to get a relocated section: " +
toString(RelocatedOrErr.takeError()));
section_iterator Relocated = *RelocatedOrErr;
if (Relocated == Obj.section_end() || !checkSectionFilter(*Relocated).Keep)
continue;
std::vector<RelocationRef> &V = Ret[*Relocated];
for (const RelocationRef &R : Sec.relocations())
V.push_back(R);
// Sort relocations by address.
llvm::stable_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;
}
typedef std::pair<uint64_t, char> MappingSymbolPair;
static char getMappingSymbolKind(ArrayRef<MappingSymbolPair> MappingSymbols,
uint64_t Address) {
auto It =
partition_point(MappingSymbols, [Address](const MappingSymbolPair &Val) {
return Val.first <= Address;
});
// Return zero for any address before the first mapping symbol; this means
// we should use the default disassembly mode, depending on the target.
if (It == MappingSymbols.begin())
return '\x00';
return (It - 1)->second;
}
static uint64_t
dumpARMELFData(uint64_t SectionAddr, uint64_t Index, uint64_t End,
const ObjectFile *Obj, ArrayRef<uint8_t> Bytes,
ArrayRef<MappingSymbolPair> MappingSymbols) {
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 (getMappingSymbolKind(MappingSymbols, Index) != 'd')
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);
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 *PrimaryDisAsm,
MCDisassembler *SecondaryDisAsm,
const MCInstrAnalysis *MIA, MCInstPrinter *IP,
const MCSubtargetInfo *PrimarySTI,
const MCSubtargetInfo *SecondarySTI,
PrettyPrinter &PIP,
SourcePrinter &SP, bool InlineRelocs) {
const MCSubtargetInfo *STI = PrimarySTI;
MCDisassembler *DisAsm = PrimaryDisAsm;
bool PrimaryIsThumb = false;
if (isArmElf(Obj))
PrimaryIsThumb = STI->checkFeatures("+thumb-mode");
std::map<SectionRef, std::vector<RelocationRef>> RelocMap;
if (InlineRelocs)
RelocMap = getRelocsMap(*Obj);
bool Is64Bits = Obj->getBytesInAddress() > 4;
// 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();
const MachOObjectFile *MachO = dyn_cast<const MachOObjectFile>(Obj);
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;
}
// Don't ask a Mach-O STAB symbol for its section unless you know that
// STAB symbol's section field refers to a valid section index. Otherwise
// the symbol may error trying to load a section that does not exist.
if (MachO) {
DataRefImpl SymDRI = Symbol.getRawDataRefImpl();
uint8_t NType = (MachO->is64Bit() ?
MachO->getSymbol64TableEntry(SymDRI).n_type:
MachO->getSymbolTableEntry(SymDRI).n_type);
if (NType & MachO::N_STAB)
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;
if (std::error_code EC = ExportEntry.getSymbolName(Name))
reportError(errorCodeToError(EC), Obj->getFileName());
if (Name.empty())
continue;
uint32_t RVA;
if (std::error_code EC = ExportEntry.getExportRVA(RVA))
reportError(errorCodeToError(EC), Obj->getFileName());
uint64_t VA = COFFObj->getImageBase() + RVA;
auto Sec = partition_point(
SectionAddresses, [VA](const std::pair<uint64_t, SectionRef> &O) {
return O.first <= VA;
});
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.
StringSet<> FoundDisasmFuncsSet;
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 (FilterSections.empty() && !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<MappingSymbolPair> MappingSymbols;
if (hasMappingSymbols(Obj)) {
for (const auto &Symb : Symbols) {
uint64_t Address = std::get<0>(Symb);
StringRef Name = std::get<1>(Symb);
if (Name.startswith("$d"))
MappingSymbols.emplace_back(Address - SectionAddr, 'd');
if (Name.startswith("$x"))
MappingSymbols.emplace_back(Address - SectionAddr, 'x');
if (Name.startswith("$a"))
MappingSymbols.emplace_back(Address - SectionAddr, 'a');
if (Name.startswith("$t"))
MappingSymbols.emplace_back(Address - SectionAddr, 't');
}
}
llvm::sort(MappingSymbols);
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 (MachO) {
DataRefImpl DR = Section.getRawDataRefImpl();
SegmentName = MachO->getSectionFinalSegmentName(DR);
}
StringRef SectionName = unwrapOrError(Section.getName(), Obj->getFileName());
// 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);
ArrayRef<uint8_t> Bytes = arrayRefFromStringRef(
unwrapOrError(Section.getContents(), Obj->getFileName()));
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) {
std::string SymbolName = std::get<1>(Symbols[SI]).str();
if (Demangle)
SymbolName = demangle(SymbolName);
// Skip if --disassemble-functions is not empty and the symbol is not in
// the list.
if (!DisasmFuncsSet.empty() && !DisasmFuncsSet.count(SymbolName))
continue;
uint64_t Start = std::get<0>(Symbols[SI]);
if (Start < SectionAddr || StopAddress <= Start)
continue;
else
FoundDisasmFuncsSet.insert(SymbolName);
// 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 || End <= StartAddress)
continue;
Start -= SectionAddr;
End -= SectionAddr;
if (!PrintedSection) {
PrintedSection = true;
outs() << "\nDisassembly of section ";
if (!SegmentName.empty())
outs() << SegmentName << ",";
outs() << SectionName << ":\n";
}
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(Is64Bits ? "%016" PRIx64 " " : "%08" PRIx64 " ",
SectionAddr + Start + VMAAdjustment);
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/common 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() && !DisassembleAll && Section.isText()) {
uint8_t SymTy = std::get<2>(Symbols[SI]);
if (SymTy == ELF::STT_OBJECT || SymTy == ELF::STT_COMMON) {
dumpELFData(SectionAddr, Index, End, Bytes);
Index = End;
}
}
bool CheckARMELFData = hasMappingSymbols(Obj) &&
std::get<2>(Symbols[SI]) != ELF::STT_OBJECT &&
!DisassembleAll;
while (Index < End) {
// ARM and 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 &&
getMappingSymbolKind(MappingSymbols, Index) == 'd') {
Index = dumpARMELFData(SectionAddr, Index, End, Obj, Bytes,
MappingSymbols);
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;
}
}
if (SecondarySTI) {
if (getMappingSymbolKind(MappingSymbols, Index) == 'a') {
STI = PrimaryIsThumb ? SecondarySTI : PrimarySTI;
DisAsm = PrimaryIsThumb ? SecondaryDisAsm : PrimaryDisAsm;
} else if (getMappingSymbolKind(MappingSymbols, Index) == 't') {
STI = PrimaryIsThumb ? PrimarySTI : SecondarySTI;
DisAsm = PrimaryIsThumb ? PrimaryDisAsm : SecondaryDisAsm;
}
}
// 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, Obj->getFileName(), &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 = partition_point(
SectionAddresses,
[=](const std::pair<uint64_t, SectionRef> &O) {
return O.first <= Target;
});
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 = partition_point(
*TargetSectionSymbols,
[=](const std::tuple<uint64_t, StringRef, uint8_t> &O) {
return std::get<0>(O) <= Target;
});
if (TargetSym == TargetSectionSymbols->begin()) {
TargetSectionSymbols = &AbsoluteSymbols;
TargetSym = partition_point(
AbsoluteSymbols,
[=](const std::tuple<uint64_t, StringRef, uint8_t> &O) {
return std::get<0>(O) <= Target;
});
}
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(Obj->getFileName(), *RelCur, SectionAddr + Offset,
Is64Bits);
++RelCur;
}
}
Index += Size;
}
}
}
StringSet<> MissingDisasmFuncsSet =
set_difference(DisasmFuncsSet, FoundDisasmFuncsSet);
for (StringRef MissingDisasmFunc : MissingDisasmFuncsSet.keys())
reportWarning("failed to disassemble missing function " + MissingDisasmFunc,
FileName);
}
static void disassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
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)
reportError(Obj->getFileName(),
"no register info for target " + TripleName);
// Set up disassembler.
MCTargetOptions MCOptions;
std::unique_ptr<const MCAsmInfo> AsmInfo(
TheTarget->createMCAsmInfo(*MRI, TripleName, MCOptions));
if (!AsmInfo)
reportError(Obj->getFileName(),
"no assembly info for target " + TripleName);
std::unique_ptr<const MCSubtargetInfo> STI(
TheTarget->createMCSubtargetInfo(TripleName, MCPU, Features.getString()));
if (!STI)
reportError(Obj->getFileName(),
"no subtarget info for target " + TripleName);
std::unique_ptr<const MCInstrInfo> MII(TheTarget->createMCInstrInfo());
if (!MII)
reportError(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)
reportError(Obj->getFileName(), "no disassembler for target " + TripleName);
// If we have an ARM object file, we need a second disassembler, because
// ARM CPUs have two different instruction sets: ARM mode, and Thumb mode.
// We use mapping symbols to switch between the two assemblers, where
// appropriate.
std::unique_ptr<MCDisassembler> SecondaryDisAsm;
std::unique_ptr<const MCSubtargetInfo> SecondarySTI;
if (isArmElf(Obj) && !STI->checkFeatures("+mclass")) {
if (STI->checkFeatures("+thumb-mode"))
Features.AddFeature("-thumb-mode");
else
Features.AddFeature("+thumb-mode");
SecondarySTI.reset(TheTarget->createMCSubtargetInfo(TripleName, MCPU,
Features.getString()));
SecondaryDisAsm.reset(TheTarget->createMCDisassembler(*SecondarySTI, Ctx));
}
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)
reportError(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))
reportError(Obj->getFileName(),
"Unrecognized disassembler option: " + Opt);
disassembleObject(TheTarget, Obj, Ctx, DisAsm.get(), SecondaryDisAsm.get(),
MIA.get(), IP.get(), STI.get(), SecondarySTI.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;
// Build a mapping from relocation target to a vector of relocation
// sections. Usually, there is an only one relocation section for
// each relocated section.
MapVector<SectionRef, std::vector<SectionRef>> SecToRelSec;
uint64_t Ndx;
for (const SectionRef &Section : ToolSectionFilter(*Obj, &Ndx)) {
if (Section.relocation_begin() == Section.relocation_end())
continue;
Expected<section_iterator> SecOrErr = Section.getRelocatedSection();
if (!SecOrErr)
reportError(Obj->getFileName(),
"section (" + Twine(Ndx) +
"): unable to get a relocation target: " +
toString(SecOrErr.takeError()));
SecToRelSec[**SecOrErr].push_back(Section);
}
for (std::pair<SectionRef, std::vector<SectionRef>> &P : SecToRelSec) {
StringRef SecName = unwrapOrError(P.first.getName(), Obj->getFileName());
outs() << "RELOCATION RECORDS FOR [" << SecName << "]:\n";
for (SectionRef Section : P.second) {
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);
if (Error E = getRelocationValueString(Reloc, ValueStr))
reportError(std::move(E), Obj->getFileName());
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) {
reportError(Obj->getFileName(), "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)
for (const RelocationRef &Reloc : Section.relocations()) {
uint64_t Address = Reloc.getOffset();
SmallString<32> RelocName;
SmallString<32> ValueStr;
Reloc.getTypeName(RelocName);
if (Error E = getRelocationValueString(Reloc, ValueStr))
reportError(std::move(E), Obj->getFileName());
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;
}
static size_t getMaxSectionNameWidth(const ObjectFile *Obj) {
// Default column width for names is 13 even if no names are that long.
size_t MaxWidth = 13;
for (const SectionRef &Section : ToolSectionFilter(*Obj)) {
StringRef Name = unwrapOrError(Section.getName(), Obj->getFileName());
MaxWidth = std::max(MaxWidth, Name.size());
}
return MaxWidth;
}
void printSectionHeaders(const ObjectFile *Obj) {
size_t NameWidth = getMaxSectionNameWidth(Obj);
size_t AddressWidth = 2 * Obj->getBytesInAddress();
bool HasLMAColumn = shouldDisplayLMA(Obj);
if (HasLMAColumn)
outs() << "Sections:\n"
"Idx "
<< left_justify("Name", NameWidth) << " Size "
<< left_justify("VMA", AddressWidth) << " "
<< left_justify("LMA", AddressWidth) << " Type\n";
else
outs() << "Sections:\n"
"Idx "
<< left_justify("Name", NameWidth) << " Size "
<< left_justify("VMA", AddressWidth) << " Type\n";
uint64_t Idx;
for (const SectionRef &Section : ToolSectionFilter(*Obj, &Idx)) {
StringRef Name = unwrapOrError(Section.getName(), Obj->getFileName());
uint64_t VMA = Section.getAddress();
if (shouldAdjustVA(Section))
VMA += AdjustVMA;
uint64_t Size = Section.getSize();
std::string Type = Section.isText() ? "TEXT" : "";
if (Section.isData())
Type += Type.empty() ? "DATA" : " DATA";
if (Section.isBSS())
Type += Type.empty() ? "BSS" : " BSS";
if (HasLMAColumn)
outs() << format("%3" PRIu64 " %-*s %08" PRIx64 " ", Idx, NameWidth,
Name.str().c_str(), Size)
<< format_hex_no_prefix(VMA, AddressWidth) << " "
<< format_hex_no_prefix(getELFSectionLMA(Section), AddressWidth)
<< " " << Type << "\n";
else
outs() << format("%3" PRIu64 " %-*s %08" PRIx64 " ", Idx, NameWidth,
Name.str().c_str(), Size)
<< format_hex_no_prefix(VMA, AddressWidth) << " " << Type << "\n";
}
outs() << "\n";
}
void printSectionContents(const ObjectFile *Obj) {
for (const SectionRef &Section : ToolSectionFilter(*Obj)) {
StringRef Name = unwrapOrError(Section.getName(), Obj->getFileName());
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;
}
StringRef Contents = unwrapOrError(Section.getContents(), Obj->getFileName());
// 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();
const MachOObjectFile *MachO = dyn_cast<const MachOObjectFile>(O);
for (auto I = O->symbol_begin(), E = O->symbol_end(); I != E; ++I) {
const SymbolRef &Symbol = *I;
uint64_t Address = unwrapOrError(Symbol.getAddress(), FileName, ArchiveName,
ArchitectureName);
if ((Address < StartAddress) || (Address > StopAddress))
continue;
SymbolRef::Type Type = unwrapOrError(Symbol.getType(), FileName,
ArchiveName, ArchitectureName);
uint32_t Flags = Symbol.getFlags();
// Don't ask a Mach-O STAB symbol for its section unless you know that
// STAB symbol's section field refers to a valid section index. Otherwise
// the symbol may error trying to load a section that does not exist.
bool isSTAB = false;
if (MachO) {
DataRefImpl SymDRI = Symbol.getRawDataRefImpl();
uint8_t NType = (MachO->is64Bit() ?
MachO->getSymbol64TableEntry(SymDRI).n_type:
MachO->getSymbolTableEntry(SymDRI).n_type);
if (NType & MachO::N_STAB)
isSTAB = true;
}
section_iterator Section = isSTAB ? O->section_end() :
unwrapOrError(Symbol.getSection(), FileName,
ArchiveName, ArchitectureName);
StringRef Name;
if (Type == SymbolRef::ST_Debug && Section != O->section_end()) {
if (Expected<StringRef> NameOrErr = Section->getName())
Name = *NameOrErr;
else
consumeError(NameOrErr.takeError());
} else {
Name = unwrapOrError(Symbol.getName(), FileName, ArchiveName,
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 =
unwrapOrError(Section->getName(), O->getFileName());
outs() << SectionName;
}
if (Common || isa<ELFObjectFileBase>(O)) {
uint64_t Val =
Common ? Symbol.getAlignment() : ELFSymbolRef(Symbol).getSize();
outs() << format("\t%08" PRIx64, Val);
}
if (isa<ELFObjectFileBase>(O)) {
uint8_t Other = ELFSymbolRef(Symbol).getOther();
switch (Other) {
case ELF::STV_DEFAULT:
break;
case ELF::STV_INTERNAL:
outs() << " .internal";
break;
case ELF::STV_HIDDEN:
outs() << " .hidden";
break;
case ELF::STV_PROTECTED:
outs() << " .protected";
break;
default:
outs() << format(" 0x%02x", Other);
break;
}
} else 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;
if (Expected<StringRef> NameOrErr = Sec.getName())
Name = *NameOrErr;
else
consumeError(NameOrErr.takeError());
if (Name == ClangASTSectionName) {
ClangASTSection = Sec;
break;
}
}
if (!ClangASTSection)
return;
StringRef ClangASTContents = unwrapOrError(
ClangASTSection.getValue().getContents(), Obj->getFileName());
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;
if (Expected<StringRef> NameOrErr = Sec.getName())
Name = *NameOrErr;
else
consumeError(NameOrErr.takeError());
if (Name == FaultMapSectionName) {
FaultMapSection = Sec;
break;
}
}
outs() << "FaultMap table:\n";
if (!FaultMapSection.hasValue()) {
outs() << "<not found>\n";
return;
}
StringRef FaultMapContents =
unwrapOrError(FaultMapSection.getValue().getContents(), Obj->getFileName());
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;
}
reportError(O->getFileName(), "Invalid/Unsupported object file format");
}
static void printFileHeaders(const ObjectFile *O) {
if (!O->isELF() && !O->isCOFF())
reportError(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";
}
// For ELF only now.
static bool shouldWarnForInvalidStartStopAddress(ObjectFile *Obj) {
if (const auto *Elf = dyn_cast<ELFObjectFileBase>(Obj)) {
if (Elf->getEType() != ELF::ET_REL)
return true;
}
return false;
}
static void checkForInvalidStartStopAddress(ObjectFile *Obj,
uint64_t Start, uint64_t Stop) {
if (!shouldWarnForInvalidStartStopAddress(Obj))
return;
for (const SectionRef &Section : Obj->sections())
if (ELFSectionRef(Section).getFlags() & ELF::SHF_ALLOC) {
uint64_t BaseAddr = Section.getAddress();
uint64_t Size = Section.getSize();
if ((Start < BaseAddr + Size) && Stop > BaseAddr)
return;
}
if (StartAddress.getNumOccurrences() == 0)
reportWarning("no section has address less than 0x" +
Twine::utohexstr(Stop) + " specified by --stop-address",
Obj->getFileName());
else if (StopAddress.getNumOccurrences() == 0)
reportWarning("no section has address greater than or equal to 0x" +
Twine::utohexstr(Start) + " specified by --start-address",
Obj->getFileName());
else
reportWarning("no section overlaps the range [0x" +
Twine::utohexstr(Start) + ",0x" + Twine::utohexstr(Stop) +
") specified by --start-address/--stop-address",
Obj->getFileName());
}
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";
}
if (StartAddress.getNumOccurrences() || StopAddress.getNumOccurrences())
checkForInvalidStartStopAddress(O, StartAddress, StopAddress);
// Note: the order here matches GNU objdump for compatability.
StringRef ArchiveName = A ? A->getFileName() : "";
if (ArchiveHeaders && !MachOOpt && C)
printArchiveChild(ArchiveName, *C);
if (FileHeaders)
printFileHeaders(O);
if (PrivateHeaders || FirstPrivateHeader)
printPrivateFileHeaders(O, FirstPrivateHeader);
if (SectionHeaders)
printSectionHeaders(O);
if (SymbolTable)
printSymbolTable(O, ArchiveName);
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);
}
if (Relocations && !Disassemble)
printRelocations(O);
if (DynamicRelocations)
printDynamicRelocations(O);
if (SectionContents)
printSectionContents(O);
if (Disassemble)
disassembleObject(O, Relocations);
if (UnwindInfo)
printUnwindInfo(O);
// Mach-O specific options:
if (ExportsTrie)
printExportsTrie(O);
if (Rebase)
printRebaseTable(O);
if (Bind)
printBindTable(O);
if (LazyBind)
printLazyBindTable(O);
if (WeakBind)
printWeakBindTable(O);
// Other special sections:
if (RawClangAST)
printRawClangAST(O);
if (FaultMapSection)
printFaultMaps(O);
}
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();
unsigned I = -1;
for (auto &C : A->children(Err)) {
++I;
Expected<std::unique_ptr<Binary>> ChildOrErr = C.getAsBinary();
if (!ChildOrErr) {
if (auto E = isNotObjectErrorInvalidFileType(ChildOrErr.takeError()))
reportError(std::move(E), getFileNameForError(C, I), A->getFileName());
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
reportError(errorCodeToError(object_error::invalid_file_type),
A->getFileName());
}
if (Err)
reportError(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
reportError(errorCodeToError(object_error::invalid_file_type), file);
}
} // namespace llvm
int main(int argc, char **argv) {
using namespace llvm;
InitLLVM X(argc, argv);
const cl::OptionCategory *OptionFilters[] = {&ObjdumpCat, &MachOCat};
cl::HideUnrelatedOptions(OptionFilters);
// 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");
if (StartAddress >= StopAddress)
reportCmdLineError("start address should be less than stop address");
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 ||
(!DisassembleFunctions.empty()))
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);
warnOnNoMatchForSections();
return EXIT_SUCCESS;
}
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