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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/Archive.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 SwapStruct(T &Value);
template<>
void SwapStruct(MachO::fat_header &H) {
sys::swapByteOrder(H.magic);
sys::swapByteOrder(H.nfat_arch);
}
template<>
void SwapStruct(MachO::fat_arch &H) {
sys::swapByteOrder(H.cputype);
sys::swapByteOrder(H.cpusubtype);
sys::swapByteOrder(H.offset);
sys::swapByteOrder(H.size);
sys::swapByteOrder(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 || Index >= Parent->getNumberOfObjects()) {
clear();
} else {
// Parse object header.
StringRef ParentData = Parent->getData();
const char *HeaderPos = ParentData.begin() + sizeof(MachO::fat_header) +
Index * sizeof(MachO::fat_arch);
Header = getUniversalBinaryStruct<MachO::fat_arch>(HeaderPos);
if (ParentData.size() < Header.offset + Header.size) {
clear();
}
}
}
ErrorOr<std::unique_ptr<MachOObjectFile>>
MachOUniversalBinary::ObjectForArch::getAsObjectFile() const {
if (Parent) {
StringRef ParentData = Parent->getData();
StringRef ObjectData = ParentData.substr(Header.offset, Header.size);
StringRef ObjectName = Parent->getFileName();
MemoryBufferRef ObjBuffer(ObjectData, ObjectName);
return ObjectFile::createMachOObjectFile(ObjBuffer);
}
return object_error::parse_failed;
}
ErrorOr<std::unique_ptr<Archive>>
MachOUniversalBinary::ObjectForArch::getAsArchive() const {
if (!Parent)
return object_error::parse_failed;
StringRef ParentData = Parent->getData();
StringRef ObjectData = ParentData.substr(Header.offset, Header.size);
StringRef ObjectName = Parent->getFileName();
MemoryBufferRef ObjBuffer(ObjectData, ObjectName);
return Archive::create(ObjBuffer);
}
void MachOUniversalBinary::anchor() { }
ErrorOr<std::unique_ptr<MachOUniversalBinary>>
MachOUniversalBinary::create(MemoryBufferRef Source) {
std::error_code EC;
std::unique_ptr<MachOUniversalBinary> Ret(
new MachOUniversalBinary(Source, EC));
if (EC)
return EC;
return std::move(Ret);
}
MachOUniversalBinary::MachOUniversalBinary(MemoryBufferRef Source,
std::error_code &ec)
: Binary(Binary::ID_MachOUniversalBinary, Source), NumberOfObjects(0) {
if (Data.getBufferSize() < sizeof(MachO::fat_header)) {
ec = object_error::invalid_file_type;
return;
}
// Check for magic value and sufficient header size.
StringRef Buf = getData();
MachO::fat_header H= getUniversalBinaryStruct<MachO::fat_header>(Buf.begin());
NumberOfObjects = H.nfat_arch;
uint32_t MinSize = sizeof(MachO::fat_header) +
sizeof(MachO::fat_arch) * NumberOfObjects;
if (H.magic != MachO::FAT_MAGIC || Buf.size() < MinSize) {
ec = object_error::parse_failed;
return;
}
ec = std::error_code();
}
ErrorOr<std::unique_ptr<MachOObjectFile>>
MachOUniversalBinary::getObjectForArch(StringRef ArchName) const {
if (Triple(ArchName).getArch() == Triple::ArchType::UnknownArch)
return object_error::arch_not_found;
for (object_iterator I = begin_objects(), E = end_objects(); I != E; ++I) {
if (I->getArchTypeName() == ArchName)
return I->getAsObjectFile();
}
return object_error::arch_not_found;
}
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