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, MemoryBufferRef Source) 21 : ObjectFile(Type, Source) {} 22 23 ErrorOr<std::unique_ptr<ObjectFile>> 24 ObjectFile::createELFObjectFile(MemoryBufferRef Obj) { 25 std::pair<unsigned char, unsigned char> Ident = 26 getElfArchType(Obj.getBuffer()); 27 std::size_t MaxAlignment = 28 1ULL << countTrailingZeros(uintptr_t(Obj.getBufferStart())); 29 30 if (MaxAlignment < 2) 31 return object_error::parse_failed; 32 33 std::error_code EC; 34 std::unique_ptr<ObjectFile> R; 35 if (Ident.first == ELF::ELFCLASS32) { 36 if (Ident.second == ELF::ELFDATA2LSB) 37 R.reset(new ELFObjectFile<ELFType<support::little, false>>(Obj, EC)); 38 else if (Ident.second == ELF::ELFDATA2MSB) 39 R.reset(new ELFObjectFile<ELFType<support::big, false>>(Obj, EC)); 40 else 41 return object_error::parse_failed; 42 } else if (Ident.first == ELF::ELFCLASS64) { 43 if (Ident.second == ELF::ELFDATA2LSB) 44 R.reset(new ELFObjectFile<ELFType<support::little, true>>(Obj, EC)); 45 else if (Ident.second == ELF::ELFDATA2MSB) 46 R.reset(new ELFObjectFile<ELFType<support::big, true>>(Obj, EC)); 47 else 48 return object_error::parse_failed; 49 } else { 50 return object_error::parse_failed; 51 } 52 53 if (EC) 54 return EC; 55 return std::move(R); 56 } 57 58 } // end namespace llvm 59
