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llvm-project/llvm/tools/macho-dump/macho-dump.cpp

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//===-- macho-dump.cpp - Mach Object Dumping Tool -------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This is a testing tool for use with the MC/Mach-O LLVM components.
//
//===----------------------------------------------------------------------===//
#include "llvm/Object/MachOObject.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/system_error.h"
using namespace llvm;
using namespace llvm::object;
static cl::opt<std::string>
InputFile(cl::Positional, cl::desc("<input file>"), cl::init("-"));
static cl::opt<bool>
ShowSectionData("dump-section-data", cl::desc("Dump the contents of sections"),
cl::init(false));
///
static const char *ProgramName;
static void Message(const char *Type, const Twine &Msg) {
errs() << ProgramName << ": " << Type << ": " << Msg << "\n";
}
static int Error(const Twine &Msg) {
Message("error", Msg);
return 1;
}
static void Warning(const Twine &Msg) {
Message("warning", Msg);
}
///
static void DumpSegmentCommandData(StringRef Name,
uint64_t VMAddr, uint64_t VMSize,
uint64_t FileOffset, uint64_t FileSize,
uint32_t MaxProt, uint32_t InitProt,
uint32_t NumSections, uint32_t Flags) {
outs() << " ('segment_name', '";
outs().write_escaped(Name, /*UseHexEscapes=*/true) << "')\n";
outs() << " ('vm_addr', " << VMAddr << ")\n";
outs() << " ('vm_size', " << VMSize << ")\n";
outs() << " ('file_offset', " << FileOffset << ")\n";
outs() << " ('file_size', " << FileSize << ")\n";
outs() << " ('maxprot', " << MaxProt << ")\n";
outs() << " ('initprot', " << InitProt << ")\n";
outs() << " ('num_sections', " << NumSections << ")\n";
outs() << " ('flags', " << Flags << ")\n";
}
static int DumpSectionData(MachOObject &Obj, unsigned Index, StringRef Name,
StringRef SegmentName, uint64_t Address,
uint64_t Size, uint32_t Offset,
uint32_t Align, uint32_t RelocationTableOffset,
uint32_t NumRelocationTableEntries,
uint32_t Flags, uint32_t Reserved1,
uint32_t Reserved2, uint64_t Reserved3 = ~0ULL) {
outs() << " # Section " << Index << "\n";
outs() << " (('section_name', '";
outs().write_escaped(Name, /*UseHexEscapes=*/true) << "')\n";
outs() << " ('segment_name', '";
outs().write_escaped(SegmentName, /*UseHexEscapes=*/true) << "')\n";
outs() << " ('address', " << Address << ")\n";
outs() << " ('size', " << Size << ")\n";
outs() << " ('offset', " << Offset << ")\n";
outs() << " ('alignment', " << Align << ")\n";
outs() << " ('reloc_offset', " << RelocationTableOffset << ")\n";
outs() << " ('num_reloc', " << NumRelocationTableEntries << ")\n";
outs() << " ('flags', " << format("0x%x", Flags) << ")\n";
outs() << " ('reserved1', " << Reserved1 << ")\n";
outs() << " ('reserved2', " << Reserved2 << ")\n";
if (Reserved3 != ~0ULL)
outs() << " ('reserved3', " << Reserved3 << ")\n";
outs() << " ),\n";
// Dump the relocation entries.
int Res = 0;
outs() << " ('_relocations', [\n";
for (unsigned i = 0; i != NumRelocationTableEntries; ++i) {
InMemoryStruct<macho::RelocationEntry> RE;
Obj.ReadRelocationEntry(RelocationTableOffset, i, RE);
if (!RE) {
Res = Error("unable to read relocation table entry '" + Twine(i) + "'");
break;
}
outs() << " # Relocation " << i << "\n";
outs() << " (('word-0', " << format("0x%x", RE->Word0) << "),\n";
outs() << " ('word-1', " << format("0x%x", RE->Word1) << ")),\n";
}
outs() << " ])\n";
// Dump the section data, if requested.
if (ShowSectionData) {
outs() << " ('_section_data', '";
StringRef Data = Obj.getData(Offset, Size);
for (unsigned i = 0; i != Data.size(); ++i) {
if (i && (i % 4) == 0)
outs() << ' ';
outs() << hexdigit((Data[i] >> 4) & 0xF, /*LowerCase=*/true);
outs() << hexdigit((Data[i] >> 0) & 0xF, /*LowerCase=*/true);
}
outs() << "')\n";
}
return Res;
}
static int DumpSegmentCommand(MachOObject &Obj,
const MachOObject::LoadCommandInfo &LCI) {
InMemoryStruct<macho::SegmentLoadCommand> SLC;
Obj.ReadSegmentLoadCommand(LCI, SLC);
if (!SLC)
return Error("unable to read segment load command");
DumpSegmentCommandData(StringRef(SLC->Name, 16), SLC->VMAddress,
SLC->VMSize, SLC->FileOffset, SLC->FileSize,
SLC->MaxVMProtection, SLC->InitialVMProtection,
SLC->NumSections, SLC->Flags);
// Dump the sections.
int Res = 0;
outs() << " ('sections', [\n";
for (unsigned i = 0; i != SLC->NumSections; ++i) {
InMemoryStruct<macho::Section> Sect;
Obj.ReadSection(LCI, i, Sect);
if (!SLC) {
Res = Error("unable to read section '" + Twine(i) + "'");
break;
}
if ((Res = DumpSectionData(Obj, i, StringRef(Sect->Name, 16),
StringRef(Sect->SegmentName, 16), Sect->Address,
Sect->Size, Sect->Offset, Sect->Align,
Sect->RelocationTableOffset,
Sect->NumRelocationTableEntries, Sect->Flags,
Sect->Reserved1, Sect->Reserved2)))
break;
}
outs() << " ])\n";
return Res;
}
static int DumpSegment64Command(MachOObject &Obj,
const MachOObject::LoadCommandInfo &LCI) {
InMemoryStruct<macho::Segment64LoadCommand> SLC;
Obj.ReadSegment64LoadCommand(LCI, SLC);
if (!SLC)
return Error("unable to read segment load command");
DumpSegmentCommandData(StringRef(SLC->Name, 16), SLC->VMAddress,
SLC->VMSize, SLC->FileOffset, SLC->FileSize,
SLC->MaxVMProtection, SLC->InitialVMProtection,
SLC->NumSections, SLC->Flags);
// Dump the sections.
int Res = 0;
outs() << " ('sections', [\n";
for (unsigned i = 0; i != SLC->NumSections; ++i) {
InMemoryStruct<macho::Section64> Sect;
Obj.ReadSection64(LCI, i, Sect);
if (!SLC) {
Res = Error("unable to read section '" + Twine(i) + "'");
break;
}
if ((Res = DumpSectionData(Obj, i, StringRef(Sect->Name, 16),
StringRef(Sect->SegmentName, 16), Sect->Address,
Sect->Size, Sect->Offset, Sect->Align,
Sect->RelocationTableOffset,
Sect->NumRelocationTableEntries, Sect->Flags,
Sect->Reserved1, Sect->Reserved2,
Sect->Reserved3)))
break;
}
outs() << " ])\n";
return 0;
}
static void DumpSymbolTableEntryData(MachOObject &Obj,
unsigned Index, uint32_t StringIndex,
uint8_t Type, uint8_t SectionIndex,
uint16_t Flags, uint64_t Value) {
outs() << " # Symbol " << Index << "\n";
outs() << " (('n_strx', " << StringIndex << ")\n";
outs() << " ('n_type', " << format("0x%x", Type) << ")\n";
outs() << " ('n_sect', " << uint32_t(SectionIndex) << ")\n";
outs() << " ('n_desc', " << Flags << ")\n";
outs() << " ('n_value', " << Value << ")\n";
outs() << " ('_string', '" << Obj.getStringAtIndex(StringIndex) << "')\n";
outs() << " ),\n";
}
static int DumpSymtabCommand(MachOObject &Obj,
const MachOObject::LoadCommandInfo &LCI) {
InMemoryStruct<macho::SymtabLoadCommand> SLC;
Obj.ReadSymtabLoadCommand(LCI, SLC);
if (!SLC)
return Error("unable to read segment load command");
outs() << " ('symoff', " << SLC->SymbolTableOffset << ")\n";
outs() << " ('nsyms', " << SLC->NumSymbolTableEntries << ")\n";
outs() << " ('stroff', " << SLC->StringTableOffset << ")\n";
outs() << " ('strsize', " << SLC->StringTableSize << ")\n";
// Cache the string table data.
Obj.RegisterStringTable(*SLC);
// Dump the string data.
outs() << " ('_string_data', '";
outs().write_escaped(Obj.getStringTableData(),
/*UseHexEscapes=*/true) << "')\n";
// Dump the symbol table.
int Res = 0;
outs() << " ('_symbols', [\n";
for (unsigned i = 0; i != SLC->NumSymbolTableEntries; ++i) {
if (Obj.is64Bit()) {
InMemoryStruct<macho::Symbol64TableEntry> STE;
Obj.ReadSymbol64TableEntry(SLC->SymbolTableOffset, i, STE);
if (!STE) {
Res = Error("unable to read symbol: '" + Twine(i) + "'");
break;
}
DumpSymbolTableEntryData(Obj, i, STE->StringIndex, STE->Type,
STE->SectionIndex, STE->Flags, STE->Value);
} else {
InMemoryStruct<macho::SymbolTableEntry> STE;
Obj.ReadSymbolTableEntry(SLC->SymbolTableOffset, i, STE);
if (!SLC) {
Res = Error("unable to read symbol: '" + Twine(i) + "'");
break;
}
DumpSymbolTableEntryData(Obj, i, STE->StringIndex, STE->Type,
STE->SectionIndex, STE->Flags, STE->Value);
}
}
outs() << " ])\n";
return Res;
}
static int DumpDysymtabCommand(MachOObject &Obj,
const MachOObject::LoadCommandInfo &LCI) {
InMemoryStruct<macho::DysymtabLoadCommand> DLC;
Obj.ReadDysymtabLoadCommand(LCI, DLC);
if (!DLC)
return Error("unable to read segment load command");
outs() << " ('ilocalsym', " << DLC->LocalSymbolsIndex << ")\n";
outs() << " ('nlocalsym', " << DLC->NumLocalSymbols << ")\n";
outs() << " ('iextdefsym', " << DLC->ExternalSymbolsIndex << ")\n";
outs() << " ('nextdefsym', " << DLC->NumExternalSymbols << ")\n";
outs() << " ('iundefsym', " << DLC->UndefinedSymbolsIndex << ")\n";
outs() << " ('nundefsym', " << DLC->NumUndefinedSymbols << ")\n";
outs() << " ('tocoff', " << DLC->TOCOffset << ")\n";
outs() << " ('ntoc', " << DLC->NumTOCEntries << ")\n";
outs() << " ('modtaboff', " << DLC->ModuleTableOffset << ")\n";
outs() << " ('nmodtab', " << DLC->NumModuleTableEntries << ")\n";
outs() << " ('extrefsymoff', " << DLC->ReferenceSymbolTableOffset << ")\n";
outs() << " ('nextrefsyms', "
<< DLC->NumReferencedSymbolTableEntries << ")\n";
outs() << " ('indirectsymoff', " << DLC->IndirectSymbolTableOffset << ")\n";
outs() << " ('nindirectsyms', "
<< DLC->NumIndirectSymbolTableEntries << ")\n";
outs() << " ('extreloff', " << DLC->ExternalRelocationTableOffset << ")\n";
outs() << " ('nextrel', " << DLC->NumExternalRelocationTableEntries << ")\n";
outs() << " ('locreloff', " << DLC->LocalRelocationTableOffset << ")\n";
outs() << " ('nlocrel', " << DLC->NumLocalRelocationTableEntries << ")\n";
// Dump the indirect symbol table.
int Res = 0;
outs() << " ('_indirect_symbols', [\n";
for (unsigned i = 0; i != DLC->NumIndirectSymbolTableEntries; ++i) {
InMemoryStruct<macho::IndirectSymbolTableEntry> ISTE;
Obj.ReadIndirectSymbolTableEntry(*DLC, i, ISTE);
if (!ISTE) {
Res = Error("unable to read segment load command");
break;
}
outs() << " # Indirect Symbol " << i << "\n";
outs() << " (('symbol_index', "
<< format("0x%x", ISTE->Index) << "),),\n";
}
outs() << " ])\n";
return Res;
}
static int DumpLoadCommand(MachOObject &Obj, unsigned Index) {
const MachOObject::LoadCommandInfo &LCI = Obj.getLoadCommandInfo(Index);
int Res = 0;
outs() << " # Load Command " << Index << "\n"
<< " (('command', " << LCI.Command.Type << ")\n"
<< " ('size', " << LCI.Command.Size << ")\n";
switch (LCI.Command.Type) {
case macho::LCT_Segment:
Res = DumpSegmentCommand(Obj, LCI);
break;
case macho::LCT_Segment64:
Res = DumpSegment64Command(Obj, LCI);
break;
case macho::LCT_Symtab:
Res = DumpSymtabCommand(Obj, LCI);
break;
case macho::LCT_Dysymtab:
Res = DumpDysymtabCommand(Obj, LCI);
break;
default:
Warning("unknown load command: " + Twine(LCI.Command.Type));
break;
}
outs() << " ),\n";
return Res;
}
int main(int argc, char **argv) {
ProgramName = argv[0];
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv, "llvm Mach-O dumping tool\n");
// Load the input file.
std::string ErrorStr;
OwningPtr<MemoryBuffer> InputBuffer;
if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFile, InputBuffer))
return Error("unable to read input: '" + ec.message() + "'");
// Construct the Mach-O wrapper object.
OwningPtr<MachOObject> InputObject(
MachOObject::LoadFromBuffer(InputBuffer.take(), &ErrorStr));
if (!InputObject)
return Error("unable to load object: '" + ErrorStr + "'");
// Print the header
InputObject->printHeader(outs());
// Print the load commands.
int Res = 0;
outs() << "('load_commands', [\n";
for (unsigned i = 0; i != InputObject->getHeader().NumLoadCommands; ++i)
if ((Res = DumpLoadCommand(*InputObject, i)))
break;
outs() << "])\n";
return Res;
}
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