1 //===- MachOUniversal.cpp - Mach-O universal binary -------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the MachOUniversalBinary class.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Object/MachOUniversal.h"
15 #include "llvm/Object/MachO.h"
16 #include "llvm/Object/ObjectFile.h"
17 #include "llvm/Support/Casting.h"
18 #include "llvm/Support/Host.h"
19 #include "llvm/Support/MemoryBuffer.h"
22 using namespace object;
25 static void SwapValue(T &Value) {
26 Value = sys::SwapByteOrder(Value);
30 static void SwapStruct(T &Value);
33 void SwapStruct(MachO::fat_header &H) {
35 SwapValue(H.nfat_arch);
39 void SwapStruct(MachO::fat_arch &H) {
41 SwapValue(H.cpusubtype);
48 static T getUniversalBinaryStruct(const char *Ptr) {
50 memcpy(&Res, Ptr, sizeof(T));
51 // Universal binary headers have big-endian byte order.
52 if (sys::IsLittleEndianHost)
57 MachOUniversalBinary::ObjectForArch::ObjectForArch(
58 const MachOUniversalBinary *Parent, uint32_t Index)
59 : Parent(Parent), Index(Index) {
60 if (Parent == 0 || Index > Parent->getNumberOfObjects()) {
63 // Parse object header.
64 StringRef ParentData = Parent->getData();
65 const char *HeaderPos = ParentData.begin() + sizeof(MachO::fat_header) +
66 Index * sizeof(MachO::fat_arch);
67 Header = getUniversalBinaryStruct<MachO::fat_arch>(HeaderPos);
68 if (ParentData.size() < Header.offset + Header.size) {
74 error_code MachOUniversalBinary::ObjectForArch::getAsObjectFile(
75 OwningPtr<ObjectFile> &Result) const {
77 StringRef ParentData = Parent->getData();
78 StringRef ObjectData = ParentData.substr(Header.offset, Header.size);
79 std::string ObjectName =
80 Parent->getFileName().str() + ":" +
81 Triple::getArchTypeName(MachOObjectFile::getArch(Header.cputype));
82 MemoryBuffer *ObjBuffer = MemoryBuffer::getMemBuffer(
83 ObjectData, ObjectName, false);
84 ErrorOr<ObjectFile *> Obj = ObjectFile::createMachOObjectFile(ObjBuffer);
85 if (error_code EC = Obj.getError())
87 Result.reset(Obj.get());
88 return object_error::success;
90 return object_error::parse_failed;
93 void MachOUniversalBinary::anchor() { }
95 ErrorOr<MachOUniversalBinary *>
96 MachOUniversalBinary::create(MemoryBuffer *Source) {
98 OwningPtr<MachOUniversalBinary> Ret(new MachOUniversalBinary(Source, EC));
101 return Ret.release();
104 MachOUniversalBinary::MachOUniversalBinary(MemoryBuffer *Source,
106 : Binary(Binary::ID_MachOUniversalBinary, Source),
108 if (Source->getBufferSize() < sizeof(MachO::fat_header)) {
109 ec = object_error::invalid_file_type;
112 // Check for magic value and sufficient header size.
113 StringRef Buf = getData();
114 MachO::fat_header H= getUniversalBinaryStruct<MachO::fat_header>(Buf.begin());
115 NumberOfObjects = H.nfat_arch;
116 uint32_t MinSize = sizeof(MachO::fat_header) +
117 sizeof(MachO::fat_arch) * NumberOfObjects;
118 if (H.magic != MachO::FAT_MAGIC || Buf.size() < MinSize) {
119 ec = object_error::parse_failed;
122 ec = object_error::success;
125 static bool getCTMForArch(Triple::ArchType Arch, MachO::CPUType &CTM) {
127 case Triple::x86: CTM = MachO::CPU_TYPE_I386; return true;
128 case Triple::x86_64: CTM = MachO::CPU_TYPE_X86_64; return true;
129 case Triple::arm: CTM = MachO::CPU_TYPE_ARM; return true;
130 case Triple::sparc: CTM = MachO::CPU_TYPE_SPARC; return true;
131 case Triple::ppc: CTM = MachO::CPU_TYPE_POWERPC; return true;
132 case Triple::ppc64: CTM = MachO::CPU_TYPE_POWERPC64; return true;
133 default: return false;
138 MachOUniversalBinary::getObjectForArch(Triple::ArchType Arch,
139 OwningPtr<ObjectFile> &Result) const {
141 if (!getCTMForArch(Arch, CTM))
142 return object_error::arch_not_found;
143 for (object_iterator I = begin_objects(), E = end_objects(); I != E; ++I) {
144 if (I->getCPUType() == static_cast<uint32_t>(CTM))
145 return I->getAsObjectFile(Result);
147 return object_error::arch_not_found;