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/ELF.h" 15#include "llvm/Support/MathExtras.h" 16 17#include <ctype.h> 18 19namespace llvm { 20 21using namespace object; 22 23// Creates an in-memory object-file by default: createELFObjectFile(Buffer) 24ObjectFile *ObjectFile::createELFObjectFile(MemoryBuffer *Object) { 25 std::pair<unsigned char, unsigned char> Ident = getElfArchType(Object); 26 error_code ec; 27 28 std::size_t MaxAlignment = 29 1ULL << CountTrailingZeros_64(uintptr_t(Object->getBufferStart())); 30 31 if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB) 32#if !LLVM_IS_UNALIGNED_ACCESS_FAST 33 if (MaxAlignment >= 4) 34 return new ELFObjectFile<ELFType<support::little, 4, false> >(Object, ec); 35 else 36#endif 37 if (MaxAlignment >= 2) 38 return new ELFObjectFile<ELFType<support::little, 2, false> >(Object, ec); 39 else 40 llvm_unreachable("Invalid alignment for ELF file!"); 41 else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB) 42#if !LLVM_IS_UNALIGNED_ACCESS_FAST 43 if (MaxAlignment >= 4) 44 return new ELFObjectFile<ELFType<support::big, 4, false> >(Object, ec); 45 else 46#endif 47 if (MaxAlignment >= 2) 48 return new ELFObjectFile<ELFType<support::big, 2, false> >(Object, ec); 49 else 50 llvm_unreachable("Invalid alignment for ELF file!"); 51 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB) 52#if !LLVM_IS_UNALIGNED_ACCESS_FAST 53 if (MaxAlignment >= 8) 54 return new ELFObjectFile<ELFType<support::big, 8, true> >(Object, ec); 55 else 56#endif 57 if (MaxAlignment >= 2) 58 return new ELFObjectFile<ELFType<support::big, 2, true> >(Object, ec); 59 else 60 llvm_unreachable("Invalid alignment for ELF file!"); 61 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) { 62#if !LLVM_IS_UNALIGNED_ACCESS_FAST 63 if (MaxAlignment >= 8) 64 return new ELFObjectFile<ELFType<support::little, 8, true> >(Object, ec); 65 else 66#endif 67 if (MaxAlignment >= 2) 68 return new ELFObjectFile<ELFType<support::little, 2, true> >(Object, ec); 69 else 70 llvm_unreachable("Invalid alignment for ELF file!"); 71 } 72 73 report_fatal_error("Buffer is not an ELF object file!"); 74} 75 76} // end namespace llvm 77