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comparison lib/Object/MachOUniversal.cpp @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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-1:000000000000 0:95c75e76d11b
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
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"
21
22 using namespace llvm;
23 using namespace object;
24
25 template<typename T>
26 static void SwapValue(T &Value) {
27 Value = sys::SwapByteOrder(Value);
28 }
29
30 template<typename T>
31 static void SwapStruct(T &Value);
32
33 template<>
34 void SwapStruct(MachO::fat_header &H) {
35 SwapValue(H.magic);
36 SwapValue(H.nfat_arch);
37 }
38
39 template<>
40 void SwapStruct(MachO::fat_arch &H) {
41 SwapValue(H.cputype);
42 SwapValue(H.cpusubtype);
43 SwapValue(H.offset);
44 SwapValue(H.size);
45 SwapValue(H.align);
46 }
47
48 template<typename T>
49 static T getUniversalBinaryStruct(const char *Ptr) {
50 T Res;
51 memcpy(&Res, Ptr, sizeof(T));
52 // Universal binary headers have big-endian byte order.
53 if (sys::IsLittleEndianHost)
54 SwapStruct(Res);
55 return Res;
56 }
57
58 MachOUniversalBinary::ObjectForArch::ObjectForArch(
59 const MachOUniversalBinary *Parent, uint32_t Index)
60 : Parent(Parent), Index(Index) {
61 if (Parent == 0 || Index > Parent->getNumberOfObjects()) {
62 clear();
63 } else {
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) {
70 clear();
71 }
72 }
73 }
74
75 error_code MachOUniversalBinary::ObjectForArch::getAsObjectFile(
76 OwningPtr<ObjectFile> &Result) const {
77 if (Parent) {
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)) {
86 Result.reset(Obj);
87 return object_error::success;
88 }
89 }
90 return object_error::parse_failed;
91 }
92
93 void MachOUniversalBinary::anchor() { }
94
95 MachOUniversalBinary::MachOUniversalBinary(MemoryBuffer *Source,
96 error_code &ec)
97 : Binary(Binary::ID_MachOUniversalBinary, Source),
98 NumberOfObjects(0) {
99 if (Source->getBufferSize() < sizeof(MachO::fat_header)) {
100 ec = object_error::invalid_file_type;
101 return;
102 }
103 // Check for magic value and sufficient header size.
104 StringRef Buf = getData();
105 MachO::fat_header H= getUniversalBinaryStruct<MachO::fat_header>(Buf.begin());
106 NumberOfObjects = H.nfat_arch;
107 uint32_t MinSize = sizeof(MachO::fat_header) +
108 sizeof(MachO::fat_arch) * NumberOfObjects;
109 if (H.magic != MachO::FAT_MAGIC || Buf.size() < MinSize) {
110 ec = object_error::parse_failed;
111 return;
112 }
113 ec = object_error::success;
114 }
115
116 static bool getCTMForArch(Triple::ArchType Arch, MachO::CPUType &CTM) {
117 switch (Arch) {
118 case Triple::x86: CTM = MachO::CPU_TYPE_I386; return true;
119 case Triple::x86_64: CTM = MachO::CPU_TYPE_X86_64; return true;
120 case Triple::arm: CTM = MachO::CPU_TYPE_ARM; return true;
121 case Triple::sparc: CTM = MachO::CPU_TYPE_SPARC; return true;
122 case Triple::ppc: CTM = MachO::CPU_TYPE_POWERPC; return true;
123 case Triple::ppc64: CTM = MachO::CPU_TYPE_POWERPC64; return true;
124 default: return false;
125 }
126 }
127
128 error_code
129 MachOUniversalBinary::getObjectForArch(Triple::ArchType Arch,
130 OwningPtr<ObjectFile> &Result) const {
131 MachO::CPUType 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);
137 }
138 return object_error::arch_not_found;
139 }