//===- ELFObjectFile.cpp - ELF object file implementation -------*- C++ -*-===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // Part of the ELFObjectFile class implementation. // //===----------------------------------------------------------------------===// #include "llvm/Object/ELF.h" #include "llvm/Support/MathExtras.h" namespace llvm { using namespace object; // Creates an in-memory object-file by default: createELFObjectFile(Buffer) ObjectFile *ObjectFile::createELFObjectFile(MemoryBuffer *Object) { std::pair<unsigned char, unsigned char> Ident = getElfArchType(Object); error_code ec; std::size_t MaxAlignment = 1ULL << CountTrailingZeros_64(uintptr_t(Object->getBufferStart())); if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB) #if !LLVM_IS_UNALIGNED_ACCESS_FAST if (MaxAlignment >= 4) return new ELFObjectFile<ELFType<support::little, 4, false> >(Object, ec); else #endif if (MaxAlignment >= 2) return new ELFObjectFile<ELFType<support::little, 2, false> >(Object, ec); else llvm_unreachable("Invalid alignment for ELF file!"); else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB) #if !LLVM_IS_UNALIGNED_ACCESS_FAST if (MaxAlignment >= 4) return new ELFObjectFile<ELFType<support::big, 4, false> >(Object, ec); else #endif if (MaxAlignment >= 2) return new ELFObjectFile<ELFType<support::big, 2, false> >(Object, ec); else llvm_unreachable("Invalid alignment for ELF file!"); else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB) #if !LLVM_IS_UNALIGNED_ACCESS_FAST if (MaxAlignment >= 8) return new ELFObjectFile<ELFType<support::big, 8, true> >(Object, ec); else #endif if (MaxAlignment >= 2) return new ELFObjectFile<ELFType<support::big, 2, true> >(Object, ec); else llvm_unreachable("Invalid alignment for ELF file!"); else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) { #if !LLVM_IS_UNALIGNED_ACCESS_FAST if (MaxAlignment >= 8) return new ELFObjectFile<ELFType<support::little, 8, true> >(Object, ec); else #endif if (MaxAlignment >= 2) return new ELFObjectFile<ELFType<support::little, 2, true> >(Object, ec); else llvm_unreachable("Invalid alignment for ELF file!"); } report_fatal_error("Buffer is not an ELF object file!"); } } // end namespace llvm