ELFObjectFile.cpp revision 4d9c5397b4a3be747bdb73f1d24c3fdbaaf438fe
1b84551a14f1c96942eb82408652e633543b0961eMichael J. Spencer//===- ELFObjectFile.cpp - ELF object file implementation -------*- C++ -*-===// 2b84551a14f1c96942eb82408652e633543b0961eMichael J. Spencer// 3b84551a14f1c96942eb82408652e633543b0961eMichael J. Spencer// The LLVM Compiler Infrastructure 4b84551a14f1c96942eb82408652e633543b0961eMichael J. Spencer// 5b84551a14f1c96942eb82408652e633543b0961eMichael J. Spencer// This file is distributed under the University of Illinois Open Source 6b84551a14f1c96942eb82408652e633543b0961eMichael J. Spencer// License. See LICENSE.TXT for details. 7b84551a14f1c96942eb82408652e633543b0961eMichael J. Spencer// 8b84551a14f1c96942eb82408652e633543b0961eMichael J. Spencer//===----------------------------------------------------------------------===// 9b84551a14f1c96942eb82408652e633543b0961eMichael J. Spencer// 10f4eff4baeb44f9dee988e9293d029dcaa359420dEli Bendersky// Part of the ELFObjectFile class implementation. 11b84551a14f1c96942eb82408652e633543b0961eMichael J. Spencer// 12b84551a14f1c96942eb82408652e633543b0961eMichael J. Spencer//===----------------------------------------------------------------------===// 13b84551a14f1c96942eb82408652e633543b0961eMichael J. Spencer 14f4eff4baeb44f9dee988e9293d029dcaa359420dEli Bendersky#include "llvm/Object/ELF.h" 154d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer#include "llvm/Support/MathExtras.h" 16b84551a14f1c96942eb82408652e633543b0961eMichael J. Spencer 17f4eff4baeb44f9dee988e9293d029dcaa359420dEli Benderskynamespace llvm { 180fcab076f0358890e2f1b213f4303c780e05d99dBenjamin Kramer 19f4eff4baeb44f9dee988e9293d029dcaa359420dEli Benderskyusing namespace object; 200fcab076f0358890e2f1b213f4303c780e05d99dBenjamin Kramer 21f4eff4baeb44f9dee988e9293d029dcaa359420dEli Bendersky// Creates an in-memory object-file by default: createELFObjectFile(Buffer) 22f4eff4baeb44f9dee988e9293d029dcaa359420dEli BenderskyObjectFile *ObjectFile::createELFObjectFile(MemoryBuffer *Object) { 23f4eff4baeb44f9dee988e9293d029dcaa359420dEli Bendersky std::pair<unsigned char, unsigned char> Ident = getElfArchType(Object); 24f4eff4baeb44f9dee988e9293d029dcaa359420dEli Bendersky error_code ec; 25bfbbe328371772a1b8408066f976a374b379e684Nick Lewycky 264d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer std::size_t MaxAlignment = 274d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer 1ULL << CountTrailingZeros_64(uintptr_t(Object->getBufferStart())); 284d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer 29f4eff4baeb44f9dee988e9293d029dcaa359420dEli Bendersky if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB) 304d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer if (MaxAlignment >= 4) 314d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer return new ELFObjectFile<support::little, 4, false>(Object, ec); 324d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer else if (MaxAlignment >= 2) 334d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer return new ELFObjectFile<support::little, 2, false>(Object, ec); 344d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer else 354d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer llvm_unreachable("Invalid alignment for ELF file!"); 36f4eff4baeb44f9dee988e9293d029dcaa359420dEli Bendersky else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB) 374d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer if (MaxAlignment >= 4) 384d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer return new ELFObjectFile<support::big, 4, false>(Object, ec); 394d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer else if (MaxAlignment >= 2) 404d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer return new ELFObjectFile<support::big, 2, false>(Object, ec); 414d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer else 424d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer llvm_unreachable("Invalid alignment for ELF file!"); 43f4eff4baeb44f9dee988e9293d029dcaa359420dEli Bendersky else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB) 444d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer if (MaxAlignment >= 8) 454d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer return new ELFObjectFile<support::big, 8, true>(Object, ec); 464d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer else if (MaxAlignment >= 2) 474d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer return new ELFObjectFile<support::big, 2, true>(Object, ec); 484d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer else 494d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer llvm_unreachable("Invalid alignment for ELF file!"); 50f4eff4baeb44f9dee988e9293d029dcaa359420dEli Bendersky else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) { 514d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer if (MaxAlignment >= 8) 524d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer return new ELFObjectFile<support::little, 8, true>(Object, ec); 534d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer else if (MaxAlignment >= 2) 544d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer return new ELFObjectFile<support::little, 2, true>(Object, ec); 554d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer else 564d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer llvm_unreachable("Invalid alignment for ELF file!"); 57bfbbe328371772a1b8408066f976a374b379e684Nick Lewycky } 584344b1ef9b3721a5ebc2e024f753772a1e4ddd92Michael J. Spencer 59f4eff4baeb44f9dee988e9293d029dcaa359420dEli Bendersky report_fatal_error("Buffer is not an ELF object file!"); 600fcab076f0358890e2f1b213f4303c780e05d99dBenjamin Kramer} 610fcab076f0358890e2f1b213f4303c780e05d99dBenjamin Kramer 62b84551a14f1c96942eb82408652e633543b0961eMichael J. Spencer} // end namespace llvm 63