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annotate 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
parents
children 54457678186b
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0
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1 //===- MachOUniversal.cpp - Mach-O universal binary -------------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file defines the MachOUniversalBinary class.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/Object/MachOUniversal.h"
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15
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16 #include "llvm/Object/MachO.h"
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17 #include "llvm/Object/ObjectFile.h"
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18 #include "llvm/Support/Casting.h"
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19 #include "llvm/Support/Host.h"
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20 #include "llvm/Support/MemoryBuffer.h"
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21
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22 using namespace llvm;
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23 using namespace object;
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24
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25 template<typename T>
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26 static void SwapValue(T &Value) {
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27 Value = sys::SwapByteOrder(Value);
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28 }
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29
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30 template<typename T>
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31 static void SwapStruct(T &Value);
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32
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33 template<>
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34 void SwapStruct(MachO::fat_header &H) {
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35 SwapValue(H.magic);
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36 SwapValue(H.nfat_arch);
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37 }
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38
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39 template<>
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40 void SwapStruct(MachO::fat_arch &H) {
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41 SwapValue(H.cputype);
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42 SwapValue(H.cpusubtype);
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43 SwapValue(H.offset);
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44 SwapValue(H.size);
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45 SwapValue(H.align);
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46 }
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47
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48 template<typename T>
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49 static T getUniversalBinaryStruct(const char *Ptr) {
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50 T Res;
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51 memcpy(&Res, Ptr, sizeof(T));
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52 // Universal binary headers have big-endian byte order.
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53 if (sys::IsLittleEndianHost)
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54 SwapStruct(Res);
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55 return Res;
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56 }
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57
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58 MachOUniversalBinary::ObjectForArch::ObjectForArch(
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59 const MachOUniversalBinary *Parent, uint32_t Index)
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60 : Parent(Parent), Index(Index) {
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61 if (Parent == 0 || Index > Parent->getNumberOfObjects()) {
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62 clear();
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63 } else {
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64 // Parse object header.
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65 StringRef ParentData = Parent->getData();
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66 const char *HeaderPos = ParentData.begin() + sizeof(MachO::fat_header) +
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67 Index * sizeof(MachO::fat_arch);
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68 Header = getUniversalBinaryStruct<MachO::fat_arch>(HeaderPos);
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69 if (ParentData.size() < Header.offset + Header.size) {
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70 clear();
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71 }
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72 }
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73 }
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74
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75 error_code MachOUniversalBinary::ObjectForArch::getAsObjectFile(
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76 OwningPtr<ObjectFile> &Result) const {
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77 if (Parent) {
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78 StringRef ParentData = Parent->getData();
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79 StringRef ObjectData = ParentData.substr(Header.offset, Header.size);
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80 std::string ObjectName =
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81 Parent->getFileName().str() + ":" +
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82 Triple::getArchTypeName(MachOObjectFile::getArch(Header.cputype));
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83 MemoryBuffer *ObjBuffer = MemoryBuffer::getMemBuffer(
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84 ObjectData, ObjectName, false);
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85 if (ObjectFile *Obj = ObjectFile::createMachOObjectFile(ObjBuffer)) {
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86 Result.reset(Obj);
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87 return object_error::success;
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88 }
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89 }
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90 return object_error::parse_failed;
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91 }
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92
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93 void MachOUniversalBinary::anchor() { }
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94
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95 MachOUniversalBinary::MachOUniversalBinary(MemoryBuffer *Source,
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96 error_code &ec)
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97 : Binary(Binary::ID_MachOUniversalBinary, Source),
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98 NumberOfObjects(0) {
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99 if (Source->getBufferSize() < sizeof(MachO::fat_header)) {
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100 ec = object_error::invalid_file_type;
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101 return;
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102 }
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103 // Check for magic value and sufficient header size.
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104 StringRef Buf = getData();
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105 MachO::fat_header H= getUniversalBinaryStruct<MachO::fat_header>(Buf.begin());
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106 NumberOfObjects = H.nfat_arch;
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107 uint32_t MinSize = sizeof(MachO::fat_header) +
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108 sizeof(MachO::fat_arch) * NumberOfObjects;
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109 if (H.magic != MachO::FAT_MAGIC || Buf.size() < MinSize) {
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110 ec = object_error::parse_failed;
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111 return;
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112 }
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113 ec = object_error::success;
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114 }
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115
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116 static bool getCTMForArch(Triple::ArchType Arch, MachO::CPUType &CTM) {
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117 switch (Arch) {
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118 case Triple::x86: CTM = MachO::CPU_TYPE_I386; return true;
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119 case Triple::x86_64: CTM = MachO::CPU_TYPE_X86_64; return true;
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120 case Triple::arm: CTM = MachO::CPU_TYPE_ARM; return true;
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121 case Triple::sparc: CTM = MachO::CPU_TYPE_SPARC; return true;
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122 case Triple::ppc: CTM = MachO::CPU_TYPE_POWERPC; return true;
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123 case Triple::ppc64: CTM = MachO::CPU_TYPE_POWERPC64; return true;
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124 default: return false;
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125 }
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126 }
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127
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128 error_code
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129 MachOUniversalBinary::getObjectForArch(Triple::ArchType Arch,
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130 OwningPtr<ObjectFile> &Result) const {
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131 MachO::CPUType CTM;
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132 if (!getCTMForArch(Arch, CTM))
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133 return object_error::arch_not_found;
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134 for (object_iterator I = begin_objects(), E = end_objects(); I != E; ++I) {
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135 if (I->getCPUType() == static_cast<uint32_t>(CTM))
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136 return I->getAsObjectFile(Result);
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137 }
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138 return object_error::arch_not_found;
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139 }