path: root/lib/Object/MachOObjectFile.cpp

//===- MachOObjectFile.cpp - Mach-O object file binding ---------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the MachOObjectFile class, which binds the MachOObject
// class to the generic ObjectFile wrapper.
//
//===----------------------------------------------------------------------===//

#include "llvm/ADT/Triple.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/MachOFormat.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/MemoryBuffer.h"

#include <cctype>
#include <cstring>
#include <limits>

using namespace llvm;
using namespace object;

namespace llvm {
namespace object {

MachOObjectFile::MachOObjectFile(MemoryBuffer *Object, MachOObject *MOO,
                                 error_code &ec)
    : ObjectFile(Binary::isMachO, Object, ec),
      MachOObj(MOO),
      RegisteredStringTable(std::numeric_limits<uint32_t>::max()) {
  DataRefImpl DRI;
  DRI.d.a = DRI.d.b = 0;
  moveToNextSection(DRI);
  uint32_t LoadCommandCount = MachOObj->getHeader().NumLoadCommands;
  while (DRI.d.a < LoadCommandCount) {
    Sections.push_back(DRI);
    DRI.d.b++;
    moveToNextSection(DRI);
  }
}


ObjectFile *ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer) {
  error_code ec;
  std::string Err;
  MachOObject *MachOObj = MachOObject::LoadFromBuffer(Buffer, &Err);
  if (!MachOObj)
    return NULL;
  return new MachOObjectFile(Buffer, MachOObj, ec);
}

/*===-- Symbols -----------------------------------------------------------===*/

void MachOObjectFile::moveToNextSymbol(DataRefImpl &DRI) const {
  uint32_t LoadCommandCount = MachOObj->getHeader().NumLoadCommands;
  while (DRI.d.a < LoadCommandCount) {
    LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
    if (LCI.Command.Type == macho::LCT_Symtab) {
      InMemoryStruct<macho::SymtabLoadCommand> SymtabLoadCmd;
      MachOObj->ReadSymtabLoadCommand(LCI, SymtabLoadCmd);
      if (DRI.d.b < SymtabLoadCmd->NumSymbolTableEntries)
        return;
    }

    DRI.d.a++;
    DRI.d.b = 0;
  }
}

void MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI,
    InMemoryStruct<macho::SymbolTableEntry> &Res) const {
  InMemoryStruct<macho::SymtabLoadCommand> SymtabLoadCmd;
  LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
  MachOObj->ReadSymtabLoadCommand(LCI, SymtabLoadCmd);

  if (RegisteredStringTable != DRI.d.a) {
    MachOObj->RegisterStringTable(*SymtabLoadCmd);
    RegisteredStringTable = DRI.d.a;
  }