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/Object/Archive.h"
18 #include "llvm/Support/Casting.h"
19 #include "llvm/Support/Host.h"
20 #include "llvm/Support/MemoryBuffer.h"
23 using namespace object;
26 static void SwapStruct(T &Value);
29 void SwapStruct(MachO::fat_header &H) {
30 sys::swapByteOrder(H.magic);
31 sys::swapByteOrder(H.nfat_arch);
35 void SwapStruct(MachO::fat_arch &H) {
36 sys::swapByteOrder(H.cputype);
37 sys::swapByteOrder(H.cpusubtype);
38 sys::swapByteOrder(H.offset);
39 sys::swapByteOrder(H.size);
40 sys::swapByteOrder(H.align);
44 static T getUniversalBinaryStruct(const char *Ptr) {
46 memcpy(&Res, Ptr, sizeof(T));
47 // Universal binary headers have big-endian byte order.
48 if (sys::IsLittleEndianHost)
53 MachOUniversalBinary::ObjectForArch::ObjectForArch(
54 const MachOUniversalBinary *Parent, uint32_t Index)
55 : Parent(Parent), Index(Index) {
56 if (!Parent || Index >= Parent->getNumberOfObjects()) {
59 // Parse object header.
60 StringRef ParentData = Parent->getData();
61 const char *HeaderPos = ParentData.begin() + sizeof(MachO::fat_header) +
62 Index * sizeof(MachO::fat_arch);
63 Header = getUniversalBinaryStruct<MachO::fat_arch>(HeaderPos);
64 if (ParentData.size() < Header.offset + Header.size) {
70 ErrorOr<std::unique_ptr<ObjectFile>>
71 MachOUniversalBinary::ObjectForArch::getAsObjectFile() const {
73 StringRef ParentData = Parent->getData();
74 StringRef ObjectData = ParentData.substr(Header.offset, Header.size);
75 std::string ObjectName = Parent->getFileName().str();
76 std::unique_ptr<MemoryBuffer> ObjBuffer(
77 MemoryBuffer::getMemBuffer(ObjectData, ObjectName, false));
78 return ObjectFile::createMachOObjectFile(ObjBuffer);
80 return object_error::parse_failed;
83 std::error_code MachOUniversalBinary::ObjectForArch::getAsArchive(
84 std::unique_ptr<Archive> &Result) const {
86 StringRef ParentData = Parent->getData();
87 StringRef ObjectData = ParentData.substr(Header.offset, Header.size);
88 std::string ObjectName = Parent->getFileName().str();
89 MemoryBuffer *ObjBuffer = MemoryBuffer::getMemBuffer(
90 ObjectData, ObjectName, false);
91 ErrorOr<Archive *> Obj = Archive::create(ObjBuffer);
92 if (std::error_code EC = Obj.getError())
94 Result.reset(Obj.get());
95 return object_error::success;
97 return object_error::parse_failed;
100 void MachOUniversalBinary::anchor() { }
102 ErrorOr<MachOUniversalBinary *>
103 MachOUniversalBinary::create(MemoryBuffer *Source) {
105 std::unique_ptr<MachOUniversalBinary> Ret(
106 new MachOUniversalBinary(Source, EC));
109 return Ret.release();
112 MachOUniversalBinary::MachOUniversalBinary(MemoryBuffer *Source,
114 : Binary(Binary::ID_MachOUniversalBinary, Source), NumberOfObjects(0) {
115 if (Source->getBufferSize() < sizeof(MachO::fat_header)) {
116 ec = object_error::invalid_file_type;
119 // Check for magic value and sufficient header size.
120 StringRef Buf = getData();
121 MachO::fat_header H= getUniversalBinaryStruct<MachO::fat_header>(Buf.begin());
122 NumberOfObjects = H.nfat_arch;
123 uint32_t MinSize = sizeof(MachO::fat_header) +
124 sizeof(MachO::fat_arch) * NumberOfObjects;
125 if (H.magic != MachO::FAT_MAGIC || Buf.size() < MinSize) {
126 ec = object_error::parse_failed;
129 ec = object_error::success;
132 static bool getCTMForArch(Triple::ArchType Arch, MachO::CPUType &CTM) {
134 case Triple::x86: CTM = MachO::CPU_TYPE_I386; return true;
135 case Triple::x86_64: CTM = MachO::CPU_TYPE_X86_64; return true;
136 case Triple::arm: CTM = MachO::CPU_TYPE_ARM; return true;
137 case Triple::sparc: CTM = MachO::CPU_TYPE_SPARC; return true;
138 case Triple::ppc: CTM = MachO::CPU_TYPE_POWERPC; return true;
139 case Triple::ppc64: CTM = MachO::CPU_TYPE_POWERPC64; return true;
140 default: return false;
144 ErrorOr<std::unique_ptr<ObjectFile>>
145 MachOUniversalBinary::getObjectForArch(Triple::ArchType Arch) const {
147 if (!getCTMForArch(Arch, CTM))
148 return object_error::arch_not_found;
149 for (object_iterator I = begin_objects(), E = end_objects(); I != E; ++I) {
150 if (I->getCPUType() == static_cast<uint32_t>(CTM))
151 return I->getAsObjectFile();
153 return object_error::arch_not_found;