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 if (ObjectFile *Obj = ObjectFile::createMachOObjectFile(ObjBuffer)) {
86 return object_error::success;
89 return object_error::parse_failed;
92 void MachOUniversalBinary::anchor() { }
94 MachOUniversalBinary::MachOUniversalBinary(MemoryBuffer *Source,
96 : Binary(Binary::ID_MachOUniversalBinary, Source),
98 if (Source->getBufferSize() < sizeof(MachO::fat_header)) {
99 ec = object_error::invalid_file_type;
102 // Check for magic value and sufficient header size.
103 StringRef Buf = getData();
104 MachO::fat_header H= getUniversalBinaryStruct<MachO::fat_header>(Buf.begin());
105 NumberOfObjects = H.nfat_arch;
106 uint32_t MinSize = sizeof(MachO::fat_header) +
107 sizeof(MachO::fat_arch) * NumberOfObjects;
108 if (H.magic != MachO::FAT_MAGIC || Buf.size() < MinSize) {
109 ec = object_error::parse_failed;
112 ec = object_error::success;
115 static bool getCTMForArch(Triple::ArchType Arch, MachO::CPUType &CTM) {
117 case Triple::x86: CTM = MachO::CPU_TYPE_I386; return true;
118 case Triple::x86_64: CTM = MachO::CPU_TYPE_X86_64; return true;
119 case Triple::arm: CTM = MachO::CPU_TYPE_ARM; return true;
120 case Triple::sparc: CTM = MachO::CPU_TYPE_SPARC; return true;
121 case Triple::ppc: CTM = MachO::CPU_TYPE_POWERPC; return true;
122 case Triple::ppc64: CTM = MachO::CPU_TYPE_POWERPC64; return true;
123 default: return false;
128 MachOUniversalBinary::getObjectForArch(Triple::ArchType Arch,
129 OwningPtr<ObjectFile> &Result) const {
131 if (!getCTMForArch(Arch, CTM))
132 return object_error::arch_not_found;
133 for (object_iterator I = begin_objects(), E = end_objects(); I != E; ++I) {
134 if (I->getCPUType() == static_cast<uint32_t>(CTM))
135 return I->getAsObjectFile(Result);
137 return object_error::arch_not_found;