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 SwapValue(T &Value) {
27 Value = sys::SwapByteOrder(Value);
31 static void SwapStruct(T &Value);
34 void SwapStruct(MachO::fat_header &H) {
36 SwapValue(H.nfat_arch);
40 void SwapStruct(MachO::fat_arch &H) {
42 SwapValue(H.cpusubtype);
49 static T getUniversalBinaryStruct(const char *Ptr) {
51 memcpy(&Res, Ptr, sizeof(T));
52 // Universal binary headers have big-endian byte order.
53 if (sys::IsLittleEndianHost)
58 MachOUniversalBinary::ObjectForArch::ObjectForArch(
59 const MachOUniversalBinary *Parent, uint32_t Index)
60 : Parent(Parent), Index(Index) {
61 if (!Parent || Index > Parent->getNumberOfObjects()) {
64 // Parse object header.
65 StringRef ParentData = Parent->getData();
66 const char *HeaderPos = ParentData.begin() + sizeof(MachO::fat_header) +
67 Index * sizeof(MachO::fat_arch);
68 Header = getUniversalBinaryStruct<MachO::fat_arch>(HeaderPos);
69 if (ParentData.size() < Header.offset + Header.size) {
75 error_code MachOUniversalBinary::ObjectForArch::getAsObjectFile(
76 std::unique_ptr<ObjectFile> &Result) const {
78 StringRef ParentData = Parent->getData();
79 StringRef ObjectData = ParentData.substr(Header.offset, Header.size);
80 std::string ObjectName =
81 Parent->getFileName().str() + ":" +
82 Triple::getArchTypeName(MachOObjectFile::getArch(Header.cputype));
83 MemoryBuffer *ObjBuffer = MemoryBuffer::getMemBuffer(
84 ObjectData, ObjectName, false);
85 ErrorOr<ObjectFile *> Obj = ObjectFile::createMachOObjectFile(ObjBuffer);
86 if (error_code EC = Obj.getError())
88 Result.reset(Obj.get());
89 return object_error::success;
91 return object_error::parse_failed;
94 error_code MachOUniversalBinary::ObjectForArch::getAsArchive(
95 std::unique_ptr<Archive> &Result) const {
97 StringRef ParentData = Parent->getData();
98 StringRef ObjectData = ParentData.substr(Header.offset, Header.size);
99 std::string ObjectName =
100 Parent->getFileName().str() + ":" +
101 Triple::getArchTypeName(MachOObjectFile::getArch(Header.cputype));
102 MemoryBuffer *ObjBuffer = MemoryBuffer::getMemBuffer(
103 ObjectData, ObjectName, false);
104 ErrorOr<Archive *> Obj = Archive::create(ObjBuffer);
105 if (error_code EC = Obj.getError())
107 Result.reset(Obj.get());
108 return object_error::success;
110 return object_error::parse_failed;
113 void MachOUniversalBinary::anchor() { }
115 ErrorOr<MachOUniversalBinary *>
116 MachOUniversalBinary::create(MemoryBuffer *Source) {
118 std::unique_ptr<MachOUniversalBinary> Ret(
119 new MachOUniversalBinary(Source, EC));
122 return Ret.release();
125 MachOUniversalBinary::MachOUniversalBinary(MemoryBuffer *Source,
127 : Binary(Binary::ID_MachOUniversalBinary, Source),
129 if (Source->getBufferSize() < sizeof(MachO::fat_header)) {
130 ec = object_error::invalid_file_type;
133 // Check for magic value and sufficient header size.
134 StringRef Buf = getData();
135 MachO::fat_header H= getUniversalBinaryStruct<MachO::fat_header>(Buf.begin());
136 NumberOfObjects = H.nfat_arch;
137 uint32_t MinSize = sizeof(MachO::fat_header) +
138 sizeof(MachO::fat_arch) * NumberOfObjects;
139 if (H.magic != MachO::FAT_MAGIC || Buf.size() < MinSize) {
140 ec = object_error::parse_failed;
143 ec = object_error::success;
146 static bool getCTMForArch(Triple::ArchType Arch, MachO::CPUType &CTM) {
148 case Triple::x86: CTM = MachO::CPU_TYPE_I386; return true;
149 case Triple::x86_64: CTM = MachO::CPU_TYPE_X86_64; return true;
150 case Triple::arm: CTM = MachO::CPU_TYPE_ARM; return true;
151 case Triple::sparc: CTM = MachO::CPU_TYPE_SPARC; return true;
152 case Triple::ppc: CTM = MachO::CPU_TYPE_POWERPC; return true;
153 case Triple::ppc64: CTM = MachO::CPU_TYPE_POWERPC64; return true;
154 default: return false;
158 error_code MachOUniversalBinary::getObjectForArch(
159 Triple::ArchType Arch, std::unique_ptr<ObjectFile> &Result) const {
161 if (!getCTMForArch(Arch, CTM))
162 return object_error::arch_not_found;
163 for (object_iterator I = begin_objects(), E = end_objects(); I != E; ++I) {
164 if (I->getCPUType() == static_cast<uint32_t>(CTM))
165 return I->getAsObjectFile(Result);
167 return object_error::arch_not_found;