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<> 29 void SwapStruct(MachO::fat_header &H) { 30 sys::swapByteOrder(H.magic); 31 sys::swapByteOrder(H.nfat_arch); 32 } 33 34 template<> 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> 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 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>> 71 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 83 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 } 99 100 void MachOUniversalBinary::anchor() { } 101 102 ErrorOr<MachOUniversalBinary *> 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 } 111 112 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 } 132 133 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>> 146 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
