1 //===- MachOUniversal.cpp - Mach-O universal binary -------------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file defines the MachOUniversalBinary class.
11 //
12 //===----------------------------------------------------------------------===//
13
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"
21
22 using namespace llvm;
23 using namespace object;
24
25 template<typename T>
26 static void SwapStruct(T &Value);
27
28 template<>
SwapStruct(MachO::fat_header & H)29 void SwapStruct(MachO::fat_header &H) {
30 sys::swapByteOrder(H.magic);
31 sys::swapByteOrder(H.nfat_arch);
32 }
33
34 template<>
SwapStruct(MachO::fat_arch & H)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);
41 }
42
43 template<typename T>
getUniversalBinaryStruct(const char * Ptr)44 static T getUniversalBinaryStruct(const char *Ptr) {
45 T Res;
46 memcpy(&Res, Ptr, sizeof(T));
47 // Universal binary headers have big-endian byte order.
48 if (sys::IsLittleEndianHost)
49 SwapStruct(Res);
50 return Res;
51 }
52
ObjectForArch(const MachOUniversalBinary * Parent,uint32_t Index)53 MachOUniversalBinary::ObjectForArch::ObjectForArch(
54 const MachOUniversalBinary *Parent, uint32_t Index)
55 : Parent(Parent), Index(Index) {
56 if (!Parent || Index >= Parent->getNumberOfObjects()) {
57 clear();
58 } else {
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) {
65 clear();
66 }
67 }
68 }
69
70 ErrorOr<std::unique_ptr<ObjectFile>>
getAsObjectFile() const71 MachOUniversalBinary::ObjectForArch::getAsObjectFile() const {
72 if (Parent) {
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);
79 }
80 return object_error::parse_failed;
81 }
82
getAsArchive(std::unique_ptr<Archive> & Result) const83 std::error_code MachOUniversalBinary::ObjectForArch::getAsArchive(
84 std::unique_ptr<Archive> &Result) const {
85 if (Parent) {
86 StringRef ParentData = Parent->getData();
87 StringRef ObjectData = ParentData.substr(Header.offset, Header.size);
88 std::string ObjectName = Parent->getFileName().str();
89 std::unique_ptr<MemoryBuffer> ObjBuffer(
90 MemoryBuffer::getMemBuffer(ObjectData, ObjectName, false));
91 ErrorOr<Archive *> Obj = Archive::create(std::move(ObjBuffer));
92 if (std::error_code EC = Obj.getError())
93 return EC;
94 Result.reset(Obj.get());
95 return object_error::success;
96 }
97 return object_error::parse_failed;
98 }
99
anchor()100 void MachOUniversalBinary::anchor() { }
101
102 ErrorOr<MachOUniversalBinary *>
create(std::unique_ptr<MemoryBuffer> Source)103 MachOUniversalBinary::create(std::unique_ptr<MemoryBuffer> Source) {
104 std::error_code EC;
105 std::unique_ptr<MachOUniversalBinary> Ret(
106 new MachOUniversalBinary(std::move(Source), EC));
107 if (EC)
108 return EC;
109 return Ret.release();
110 }
111
MachOUniversalBinary(std::unique_ptr<MemoryBuffer> Source,std::error_code & ec)112 MachOUniversalBinary::MachOUniversalBinary(std::unique_ptr<MemoryBuffer> Source,
113 std::error_code &ec)
114 : Binary(Binary::ID_MachOUniversalBinary, std::move(Source)),
115 NumberOfObjects(0) {
116 if (Data->getBufferSize() < sizeof(MachO::fat_header)) {
117 ec = object_error::invalid_file_type;
118 return;
119 }
120 // Check for magic value and sufficient header size.
121 StringRef Buf = getData();
122 MachO::fat_header H= getUniversalBinaryStruct<MachO::fat_header>(Buf.begin());
123 NumberOfObjects = H.nfat_arch;
124 uint32_t MinSize = sizeof(MachO::fat_header) +
125 sizeof(MachO::fat_arch) * NumberOfObjects;
126 if (H.magic != MachO::FAT_MAGIC || Buf.size() < MinSize) {
127 ec = object_error::parse_failed;
128 return;
129 }
130 ec = object_error::success;
131 }
132
getCTMForArch(Triple::ArchType Arch,MachO::CPUType & CTM)133 static bool getCTMForArch(Triple::ArchType Arch, MachO::CPUType &CTM) {
134 switch (Arch) {
135 case Triple::x86: CTM = MachO::CPU_TYPE_I386; return true;
136 case Triple::x86_64: CTM = MachO::CPU_TYPE_X86_64; return true;
137 case Triple::arm: CTM = MachO::CPU_TYPE_ARM; return true;
138 case Triple::sparc: CTM = MachO::CPU_TYPE_SPARC; return true;
139 case Triple::ppc: CTM = MachO::CPU_TYPE_POWERPC; return true;
140 case Triple::ppc64: CTM = MachO::CPU_TYPE_POWERPC64; return true;
141 default: return false;
142 }
143 }
144
145 ErrorOr<std::unique_ptr<ObjectFile>>
getObjectForArch(Triple::ArchType Arch) const146 MachOUniversalBinary::getObjectForArch(Triple::ArchType Arch) const {
147 MachO::CPUType CTM;
148 if (!getCTMForArch(Arch, CTM))
149 return object_error::arch_not_found;
150 for (object_iterator I = begin_objects(), E = end_objects(); I != E; ++I) {
151 if (I->getCPUType() == static_cast<uint32_t>(CTM))
152 return I->getAsObjectFile();
153 }
154 return object_error::arch_not_found;
155 }
156