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;
24 using std::error_code;
27 static void SwapValue(T &Value) {
28 Value = sys::SwapByteOrder(Value);
32 static void SwapStruct(T &Value);
35 void SwapStruct(MachO::fat_header &H) {
37 SwapValue(H.nfat_arch);
41 void SwapStruct(MachO::fat_arch &H) {
43 SwapValue(H.cpusubtype);
50 static T getUniversalBinaryStruct(const char *Ptr) {
52 memcpy(&Res, Ptr, sizeof(T));
53 // Universal binary headers have big-endian byte order.
54 if (sys::IsLittleEndianHost)
59 MachOUniversalBinary::ObjectForArch::ObjectForArch(
60 const MachOUniversalBinary *Parent, uint32_t Index)
61 : Parent(Parent), Index(Index) {
62 if (!Parent || Index > Parent->getNumberOfObjects()) {
65 // Parse object header.
66 StringRef ParentData = Parent->getData();
67 const char *HeaderPos = ParentData.begin() + sizeof(MachO::fat_header) +
68 Index * sizeof(MachO::fat_arch);
69 Header = getUniversalBinaryStruct<MachO::fat_arch>(HeaderPos);
70 if (ParentData.size() < Header.offset + Header.size) {
76 error_code MachOUniversalBinary::ObjectForArch::getAsObjectFile(
77 std::unique_ptr<ObjectFile> &Result) const {
79 StringRef ParentData = Parent->getData();
80 StringRef ObjectData = ParentData.substr(Header.offset, Header.size);
81 std::string ObjectName =
82 Parent->getFileName().str() + ":" +
83 Triple::getArchTypeName(MachOObjectFile::getArch(Header.cputype));
84 MemoryBuffer *ObjBuffer = MemoryBuffer::getMemBuffer(
85 ObjectData, ObjectName, false);
86 ErrorOr<ObjectFile *> Obj = ObjectFile::createMachOObjectFile(ObjBuffer);
87 if (error_code EC = Obj.getError())
89 Result.reset(Obj.get());
90 return object_error::success;
92 return object_error::parse_failed;
95 error_code MachOUniversalBinary::ObjectForArch::getAsArchive(
96 std::unique_ptr<Archive> &Result) const {
98 StringRef ParentData = Parent->getData();
99 StringRef ObjectData = ParentData.substr(Header.offset, Header.size);
100 std::string ObjectName =
101 Parent->getFileName().str() + ":" +
102 Triple::getArchTypeName(MachOObjectFile::getArch(Header.cputype));
103 MemoryBuffer *ObjBuffer = MemoryBuffer::getMemBuffer(
104 ObjectData, ObjectName, false);
105 ErrorOr<Archive *> Obj = Archive::create(ObjBuffer);
106 if (error_code EC = Obj.getError())
108 Result.reset(Obj.get());
109 return object_error::success;
111 return object_error::parse_failed;
114 void MachOUniversalBinary::anchor() { }
116 ErrorOr<MachOUniversalBinary *>
117 MachOUniversalBinary::create(MemoryBuffer *Source) {
119 std::unique_ptr<MachOUniversalBinary> Ret(
120 new MachOUniversalBinary(Source, EC));
123 return Ret.release();
126 MachOUniversalBinary::MachOUniversalBinary(MemoryBuffer *Source,
128 : Binary(Binary::ID_MachOUniversalBinary, Source),
130 if (Source->getBufferSize() < sizeof(MachO::fat_header)) {
131 ec = object_error::invalid_file_type;
134 // Check for magic value and sufficient header size.
135 StringRef Buf = getData();
136 MachO::fat_header H= getUniversalBinaryStruct<MachO::fat_header>(Buf.begin());
137 NumberOfObjects = H.nfat_arch;
138 uint32_t MinSize = sizeof(MachO::fat_header) +
139 sizeof(MachO::fat_arch) * NumberOfObjects;
140 if (H.magic != MachO::FAT_MAGIC || Buf.size() < MinSize) {
141 ec = object_error::parse_failed;
144 ec = object_error::success;
147 static bool getCTMForArch(Triple::ArchType Arch, MachO::CPUType &CTM) {
149 case Triple::x86: CTM = MachO::CPU_TYPE_I386; return true;
150 case Triple::x86_64: CTM = MachO::CPU_TYPE_X86_64; return true;
151 case Triple::arm: CTM = MachO::CPU_TYPE_ARM; return true;
152 case Triple::sparc: CTM = MachO::CPU_TYPE_SPARC; return true;
153 case Triple::ppc: CTM = MachO::CPU_TYPE_POWERPC; return true;
154 case Triple::ppc64: CTM = MachO::CPU_TYPE_POWERPC64; return true;
155 default: return false;
159 error_code MachOUniversalBinary::getObjectForArch(
160 Triple::ArchType Arch, std::unique_ptr<ObjectFile> &Result) const {
162 if (!getCTMForArch(Arch, CTM))
163 return object_error::arch_not_found;
164 for (object_iterator I = begin_objects(), E = end_objects(); I != E; ++I) {
165 if (I->getCPUType() == static_cast<uint32_t>(CTM))
166 return I->getAsObjectFile(Result);
168 return object_error::arch_not_found;