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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/Twine.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.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>
DumpSectionData("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 int DumpHeader(MachOObject &Obj) {
// Read the header.
const macho::Header &Hdr = Obj.getHeader();
outs() << "('cputype', " << Hdr.CPUType << ")\n";
outs() << "('cpusubtype', " << Hdr.CPUSubtype << ")\n";
outs() << "('filetype', " << Hdr.FileType << ")\n";
outs() << "('num_load_commands', " << Hdr.NumLoadCommands << ")\n";
outs() << "('load_commands_size', " << Hdr.SizeOfLoadCommands << ")\n";
outs() << "('flag', " << Hdr.Flags << ")\n";
// Print extended header if 64-bit.
if (Obj.is64Bit()) {
const macho::Header64Ext &Hdr64 = Obj.getHeader64Ext();
outs() << "('reserved', " << Hdr64.Reserved << ")\n";
}
return 0;
}
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 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);
return 0;
}
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);
return 0;
}
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;
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(
MemoryBuffer::getFileOrSTDIN(InputFile, &ErrorStr));
if (!InputBuffer)
return Error("unable to read input: '" + ErrorStr + "'");
// Construct the Mach-O wrapper object.
OwningPtr<MachOObject> InputObject(
MachOObject::LoadFromBuffer(InputBuffer.take(), &ErrorStr));
if (!InputObject)
return Error("unable to load object: '" + ErrorStr + "'");
if (int Res = DumpHeader(*InputObject))
return Res;
// 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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