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annotate lib/Object/MachOUniversal.cpp @ 92:8a1cd0ffee6e

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Create prototype declaration automatically if prototype was not found when parsing continuation arguments.
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Fri, 17 Apr 2015 13:54:34 +0900
parents 60c9769439b8
children afa8332a0e37
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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 #include "llvm/Object/Archive.h"
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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 SwapStruct(T &Value);
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27
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28 template<>
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29 void SwapStruct(MachO::fat_header &H) {
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30 sys::swapByteOrder(H.magic);
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31 sys::swapByteOrder(H.nfat_arch);
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32 }
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33
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34 template<>
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35 void SwapStruct(MachO::fat_arch &H) {
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36 sys::swapByteOrder(H.cputype);
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37 sys::swapByteOrder(H.cpusubtype);
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38 sys::swapByteOrder(H.offset);
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39 sys::swapByteOrder(H.size);
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40 sys::swapByteOrder(H.align);
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41 }
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42
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43 template<typename T>
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44 static T getUniversalBinaryStruct(const char *Ptr) {
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45 T Res;
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46 memcpy(&Res, Ptr, sizeof(T));
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47 // Universal binary headers have big-endian byte order.
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48 if (sys::IsLittleEndianHost)
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49 SwapStruct(Res);
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50 return Res;
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51 }
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52
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53 MachOUniversalBinary::ObjectForArch::ObjectForArch(
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54 const MachOUniversalBinary *Parent, uint32_t Index)
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55 : Parent(Parent), Index(Index) {
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56 if (!Parent || Index >= Parent->getNumberOfObjects()) {
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57 clear();
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58 } else {
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59 // Parse object header.
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60 StringRef ParentData = Parent->getData();
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61 const char *HeaderPos = ParentData.begin() + sizeof(MachO::fat_header) +
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62 Index * sizeof(MachO::fat_arch);
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63 Header = getUniversalBinaryStruct<MachO::fat_arch>(HeaderPos);
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64 if (ParentData.size() < Header.offset + Header.size) {
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65 clear();
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66 }
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67 }
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68 }
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69
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70 ErrorOr<std::unique_ptr<MachOObjectFile>>
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71 MachOUniversalBinary::ObjectForArch::getAsObjectFile() const {
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72 if (Parent) {
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73 StringRef ParentData = Parent->getData();
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74 StringRef ObjectData = ParentData.substr(Header.offset, Header.size);
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75 StringRef ObjectName = Parent->getFileName();
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76 MemoryBufferRef ObjBuffer(ObjectData, ObjectName);
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77 return ObjectFile::createMachOObjectFile(ObjBuffer);
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78 }
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79 return object_error::parse_failed;
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80 }
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81
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82 ErrorOr<std::unique_ptr<Archive>>
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83 MachOUniversalBinary::ObjectForArch::getAsArchive() const {
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84 if (!Parent)
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85 return object_error::parse_failed;
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86
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87 StringRef ParentData = Parent->getData();
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88 StringRef ObjectData = ParentData.substr(Header.offset, Header.size);
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89 StringRef ObjectName = Parent->getFileName();
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90 MemoryBufferRef ObjBuffer(ObjectData, ObjectName);
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91 return Archive::create(ObjBuffer);
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92 }
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93
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94 void MachOUniversalBinary::anchor() { }
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95
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96 ErrorOr<std::unique_ptr<MachOUniversalBinary>>
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97 MachOUniversalBinary::create(MemoryBufferRef Source) {
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98 std::error_code EC;
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99 std::unique_ptr<MachOUniversalBinary> Ret(
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100 new MachOUniversalBinary(Source, EC));
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101 if (EC)
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102 return EC;
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103 return std::move(Ret);
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104 }
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105
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106 MachOUniversalBinary::MachOUniversalBinary(MemoryBufferRef Source,
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107 std::error_code &ec)
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108 : Binary(Binary::ID_MachOUniversalBinary, Source), NumberOfObjects(0) {
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109 if (Data.getBufferSize() < sizeof(MachO::fat_header)) {
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110 ec = object_error::invalid_file_type;
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111 return;
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112 }
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113 // Check for magic value and sufficient header size.
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114 StringRef Buf = getData();
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115 MachO::fat_header H= getUniversalBinaryStruct<MachO::fat_header>(Buf.begin());
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116 NumberOfObjects = H.nfat_arch;
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117 uint32_t MinSize = sizeof(MachO::fat_header) +
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118 sizeof(MachO::fat_arch) * NumberOfObjects;
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119 if (H.magic != MachO::FAT_MAGIC || Buf.size() < MinSize) {
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120 ec = object_error::parse_failed;
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121 return;
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122 }
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123 ec = object_error::success;
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124 }
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125
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126 static bool getCTMForArch(Triple::ArchType Arch, MachO::CPUType &CTM) {
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127 switch (Arch) {
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128 case Triple::x86: CTM = MachO::CPU_TYPE_I386; return true;
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129 case Triple::x86_64: CTM = MachO::CPU_TYPE_X86_64; return true;
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130 case Triple::arm: CTM = MachO::CPU_TYPE_ARM; return true;
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131 case Triple::sparc: CTM = MachO::CPU_TYPE_SPARC; return true;
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132 case Triple::ppc: CTM = MachO::CPU_TYPE_POWERPC; return true;
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133 case Triple::ppc64: CTM = MachO::CPU_TYPE_POWERPC64; return true;
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134 default: return false;
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135 }
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136 }
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137
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138 ErrorOr<std::unique_ptr<MachOObjectFile>>
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139 MachOUniversalBinary::getObjectForArch(Triple::ArchType Arch) const {
0
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140 MachO::CPUType CTM;
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141 if (!getCTMForArch(Arch, CTM))
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142 return object_error::arch_not_found;
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143 for (object_iterator I = begin_objects(), E = end_objects(); I != E; ++I) {
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144 if (I->getCPUType() == static_cast<uint32_t>(CTM))
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145 return I->getAsObjectFile();
0
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146 }
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147 return object_error::arch_not_found;
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148 }