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"
16 #include "llvm/Object/MachO.h"
17 #include "llvm/Object/ObjectFile.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::FatHeader &H) {
36 SwapValue(H.NumFatArch);
40 void SwapStruct(macho::FatArchHeader &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 == 0 || Index > Parent->getNumberOfObjects()) {
64 // Parse object header.
65 StringRef ParentData = Parent->getData();
66 const char *HeaderPos = ParentData.begin() + macho::FatHeaderSize +
67 Index * macho::FatArchHeaderSize;
68 Header = getUniversalBinaryStruct<macho::FatArchHeader>(HeaderPos);
69 if (ParentData.size() < Header.Offset + Header.Size) {
75 error_code MachOUniversalBinary::ObjectForArch::getAsObjectFile(
76 OwningPtr<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 if (ObjectFile *Obj = ObjectFile::createMachOObjectFile(ObjBuffer)) {
87 return object_error::success;
90 return object_error::parse_failed;
93 void MachOUniversalBinary::anchor() { }
95 MachOUniversalBinary::MachOUniversalBinary(MemoryBuffer *Source,
97 : Binary(Binary::ID_MachOUniversalBinary, Source),
99 if (Source->getBufferSize() < macho::FatHeaderSize) {
100 ec = object_error::invalid_file_type;
103 // Check for magic value and sufficient header size.
104 StringRef Buf = getData();
105 macho::FatHeader H = getUniversalBinaryStruct<macho::FatHeader>(Buf.begin());
106 NumberOfObjects = H.NumFatArch;
107 uint32_t MinSize = macho::FatHeaderSize +
108 macho::FatArchHeaderSize * NumberOfObjects;
109 if (H.Magic != macho::HM_Universal || Buf.size() < MinSize) {
110 ec = object_error::parse_failed;
113 ec = object_error::success;
116 static bool getCTMForArch(Triple::ArchType Arch, mach::CPUTypeMachine &CTM) {
118 case Triple::x86: CTM = mach::CTM_i386; return true;
119 case Triple::x86_64: CTM = mach::CTM_x86_64; return true;
120 case Triple::arm: CTM = mach::CTM_ARM; return true;
121 case Triple::sparc: CTM = mach::CTM_SPARC; return true;
122 case Triple::ppc: CTM = mach::CTM_PowerPC; return true;
123 case Triple::ppc64: CTM = mach::CTM_PowerPC64; return true;
124 default: return false;
129 MachOUniversalBinary::getObjectForArch(Triple::ArchType Arch,
130 OwningPtr<ObjectFile> &Result) const {
131 mach::CPUTypeMachine CTM;
132 if (!getCTMForArch(Arch, CTM))
133 return object_error::arch_not_found;
134 for (object_iterator I = begin_objects(), E = end_objects(); I != E; ++I) {
135 if (I->getCPUType() == static_cast<uint32_t>(CTM))
136 return I->getAsObjectFile(Result);
138 return object_error::arch_not_found;