llvm-6502/lib/Object/MachOUniversal.cpp

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//===- MachOUniversal.cpp - Mach-O universal binary -------------*- 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 MachOUniversalBinary class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Object/MachOUniversal.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/MemoryBuffer.h"
using namespace llvm;
using namespace object;
template<typename T>
static void SwapValue(T &Value) {
Value = sys::SwapByteOrder(Value);
}
template<typename T>
static void SwapStruct(T &Value);
template<>
void SwapStruct(macho::FatHeader &H) {
SwapValue(H.Magic);
SwapValue(H.NumFatArch);
}
template<>
void SwapStruct(macho::FatArchHeader &H) {
SwapValue(H.CPUType);
SwapValue(H.CPUSubtype);
SwapValue(H.Offset);
SwapValue(H.Size);
SwapValue(H.Align);
}
template<typename T>
static T getUniversalBinaryStruct(const char *Ptr) {
T Res;
memcpy(&Res, Ptr, sizeof(T));
// Universal binary headers have big-endian byte order.
if (sys::IsLittleEndianHost)
SwapStruct(Res);
return Res;
}
MachOUniversalBinary::ObjectForArch::ObjectForArch(
const MachOUniversalBinary *Parent, uint32_t Index)
: Parent(Parent), Index(Index) {
if (Parent == 0 || Index > Parent->getNumberOfObjects()) {
clear();
} else {
// Parse object header.
StringRef ParentData = Parent->getData();
const char *HeaderPos = ParentData.begin() + macho::FatHeaderSize +
Index * macho::FatArchHeaderSize;
Header = getUniversalBinaryStruct<macho::FatArchHeader>(HeaderPos);
if (ParentData.size() < Header.Offset + Header.Size) {
clear();
}
}
}
error_code MachOUniversalBinary::ObjectForArch::getAsObjectFile(
OwningPtr<ObjectFile> &Result) const {
if (Parent) {
StringRef ParentData = Parent->getData();
StringRef ObjectData = ParentData.substr(Header.Offset, Header.Size);
std::string ObjectName =
Parent->getFileName().str() + ":" +
Triple::getArchTypeName(MachOObjectFile::getArch(Header.CPUType));
MemoryBuffer *ObjBuffer = MemoryBuffer::getMemBuffer(
ObjectData, ObjectName, false);
if (ObjectFile *Obj = ObjectFile::createMachOObjectFile(ObjBuffer)) {
Result.reset(Obj);
return object_error::success;
}
}
return object_error::parse_failed;
}
void MachOUniversalBinary::anchor() { }
MachOUniversalBinary::MachOUniversalBinary(MemoryBuffer *Source,
error_code &ec)
: Binary(Binary::ID_MachOUniversalBinary, Source),
NumberOfObjects(0) {
if (Source->getBufferSize() < macho::FatHeaderSize) {
ec = object_error::invalid_file_type;
return;
}
// Check for magic value and sufficient header size.
StringRef Buf = getData();
macho::FatHeader H = getUniversalBinaryStruct<macho::FatHeader>(Buf.begin());
NumberOfObjects = H.NumFatArch;
uint32_t MinSize = macho::FatHeaderSize +
macho::FatArchHeaderSize * NumberOfObjects;
if (H.Magic != macho::HM_Universal || Buf.size() < MinSize) {
ec = object_error::parse_failed;
return;
}
ec = object_error::success;
}
static bool getCTMForArch(Triple::ArchType Arch, mach::CPUTypeMachine &CTM) {
switch (Arch) {
case Triple::x86: CTM = mach::CTM_i386; return true;
case Triple::x86_64: CTM = mach::CTM_x86_64; return true;
case Triple::arm: CTM = mach::CTM_ARM; return true;
case Triple::sparc: CTM = mach::CTM_SPARC; return true;
case Triple::ppc: CTM = mach::CTM_PowerPC; return true;
case Triple::ppc64: CTM = mach::CTM_PowerPC64; return true;
default: return false;
}
}
error_code
MachOUniversalBinary::getObjectForArch(Triple::ArchType Arch,
OwningPtr<ObjectFile> &Result) const {
mach::CPUTypeMachine CTM;
if (!getCTMForArch(Arch, CTM))
return object_error::arch_not_found;
for (object_iterator I = begin_objects(), E = end_objects(); I != E; ++I) {
if (I->getCPUType() == static_cast<uint32_t>(CTM))
return I->getAsObjectFile(Result);
}
return object_error::arch_not_found;
}