1 //===- ELFObjectFile.cpp - ELF object file implementation -------*- 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 // Part of the ELFObjectFile class implementation. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/Object/ELFObjectFile.h" 15 #include "llvm/Support/MathExtras.h" 16 17 namespace llvm { 18 using namespace object; 19 20 ELFObjectFileBase::ELFObjectFileBase(unsigned int Type, 21 std::unique_ptr<MemoryBuffer> Source) 22 : ObjectFile(Type, std::move(Source)) {} 23 24 ErrorOr<std::unique_ptr<ObjectFile>> 25 ObjectFile::createELFObjectFile(std::unique_ptr<MemoryBuffer> &Obj) { 26 std::pair<unsigned char, unsigned char> Ident = 27 getElfArchType(Obj->getBuffer()); 28 std::size_t MaxAlignment = 29 1ULL << countTrailingZeros(uintptr_t(Obj->getBufferStart())); 30 31 std::error_code EC; 32 std::unique_ptr<ObjectFile> R; 33 if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB) 34 #if !LLVM_IS_UNALIGNED_ACCESS_FAST 35 if (MaxAlignment >= 4) 36 R.reset(new ELFObjectFile<ELFType<support::little, 4, false>>( 37 std::move(Obj), EC)); 38 else 39 #endif 40 if (MaxAlignment >= 2) 41 R.reset(new ELFObjectFile<ELFType<support::little, 2, false>>( 42 std::move(Obj), EC)); 43 else 44 return object_error::parse_failed; 45 else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB) 46 #if !LLVM_IS_UNALIGNED_ACCESS_FAST 47 if (MaxAlignment >= 4) 48 R.reset(new ELFObjectFile<ELFType<support::big, 4, false>>(std::move(Obj), 49 EC)); 50 else 51 #endif 52 if (MaxAlignment >= 2) 53 R.reset(new ELFObjectFile<ELFType<support::big, 2, false>>(std::move(Obj), 54 EC)); 55 else 56 return object_error::parse_failed; 57 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB) 58 #if !LLVM_IS_UNALIGNED_ACCESS_FAST 59 if (MaxAlignment >= 8) 60 R.reset(new ELFObjectFile<ELFType<support::big, 8, true>>(std::move(Obj), 61 EC)); 62 else 63 #endif 64 if (MaxAlignment >= 2) 65 R.reset(new ELFObjectFile<ELFType<support::big, 2, true>>(std::move(Obj), 66 EC)); 67 else 68 return object_error::parse_failed; 69 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) { 70 #if !LLVM_IS_UNALIGNED_ACCESS_FAST 71 if (MaxAlignment >= 8) 72 R.reset(new ELFObjectFile<ELFType<support::little, 8, true>>( 73 std::move(Obj), EC)); 74 else 75 #endif 76 if (MaxAlignment >= 2) 77 R.reset(new ELFObjectFile<ELFType<support::little, 2, true>>( 78 std::move(Obj), EC)); 79 else 80 return object_error::parse_failed; 81 } 82 else 83 llvm_unreachable("Buffer is not an ELF object file!"); 84 85 if (EC) 86 return EC; 87 return std::move(R); 88 } 89 90 } // end namespace llvm 91