ELFObjectFile.cpp revision 36b56886974eae4f9c5ebc96befd3e7bfe5de338
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 14081a1941b595f6294e4ce678fd61ef56a2ceb51eMichael J. Spencer#include "llvm/Object/ELFObjectFile.h" 154d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer#include "llvm/Support/MathExtras.h" 16b84551a14f1c96942eb82408652e633543b0961eMichael J. Spencer 17f4eff4baeb44f9dee988e9293d029dcaa359420dEli Benderskynamespace llvm { 18f4eff4baeb44f9dee988e9293d029dcaa359420dEli Benderskyusing namespace object; 190fcab076f0358890e2f1b213f4303c780e05d99dBenjamin Kramer 2036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen HinesErrorOr<ObjectFile *> ObjectFile::createELFObjectFile(MemoryBuffer *Obj, 2136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines bool BufferOwned) { 2236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines std::pair<unsigned char, unsigned char> Ident = getElfArchType(Obj); 234d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer std::size_t MaxAlignment = 2436b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines 1ULL << countTrailingZeros(uintptr_t(Obj->getBufferStart())); 254d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer 2636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines error_code EC; 2736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines std::unique_ptr<ObjectFile> R; 28f4eff4baeb44f9dee988e9293d029dcaa359420dEli Bendersky if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB) 29d9d2f187759d0154574657c195068d367c338473Michael J. Spencer#if !LLVM_IS_UNALIGNED_ACCESS_FAST 304d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer if (MaxAlignment >= 4) 3136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines R.reset(new ELFObjectFile<ELFType<support::little, 4, false> >( 3236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines Obj, EC, BufferOwned)); 33d9d2f187759d0154574657c195068d367c338473Michael J. Spencer else 34d9d2f187759d0154574657c195068d367c338473Michael J. Spencer#endif 35d9d2f187759d0154574657c195068d367c338473Michael J. Spencer if (MaxAlignment >= 2) 3636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines R.reset(new ELFObjectFile<ELFType<support::little, 2, false> >( 3736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines Obj, EC, BufferOwned)); 384d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer else 394d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer llvm_unreachable("Invalid alignment for ELF file!"); 40f4eff4baeb44f9dee988e9293d029dcaa359420dEli Bendersky else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB) 41d9d2f187759d0154574657c195068d367c338473Michael J. Spencer#if !LLVM_IS_UNALIGNED_ACCESS_FAST 424d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer if (MaxAlignment >= 4) 4336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines R.reset(new ELFObjectFile<ELFType<support::big, 4, false> >(Obj, EC, 4436b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines BufferOwned)); 45d9d2f187759d0154574657c195068d367c338473Michael J. Spencer else 46d9d2f187759d0154574657c195068d367c338473Michael J. Spencer#endif 47d9d2f187759d0154574657c195068d367c338473Michael J. Spencer if (MaxAlignment >= 2) 4836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines R.reset(new ELFObjectFile<ELFType<support::big, 2, false> >(Obj, EC, 4936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines BufferOwned)); 504d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer else 514d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer llvm_unreachable("Invalid alignment for ELF file!"); 52f4eff4baeb44f9dee988e9293d029dcaa359420dEli Bendersky else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB) 53d9d2f187759d0154574657c195068d367c338473Michael J. Spencer#if !LLVM_IS_UNALIGNED_ACCESS_FAST 544d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer if (MaxAlignment >= 8) 5536b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines R.reset(new ELFObjectFile<ELFType<support::big, 8, true> >(Obj, EC, 5636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines BufferOwned)); 57d9d2f187759d0154574657c195068d367c338473Michael J. Spencer else 58d9d2f187759d0154574657c195068d367c338473Michael J. Spencer#endif 59d9d2f187759d0154574657c195068d367c338473Michael J. Spencer if (MaxAlignment >= 2) 6036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines R.reset(new ELFObjectFile<ELFType<support::big, 2, true> >(Obj, EC, 6136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines BufferOwned)); 624d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer else 634d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer llvm_unreachable("Invalid alignment for ELF file!"); 64f4eff4baeb44f9dee988e9293d029dcaa359420dEli Bendersky else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) { 65d9d2f187759d0154574657c195068d367c338473Michael J. Spencer#if !LLVM_IS_UNALIGNED_ACCESS_FAST 664d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer if (MaxAlignment >= 8) 6736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines R.reset(new ELFObjectFile<ELFType<support::little, 8, true> >( 6836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines Obj, EC, BufferOwned)); 69d9d2f187759d0154574657c195068d367c338473Michael J. Spencer else 70d9d2f187759d0154574657c195068d367c338473Michael J. Spencer#endif 71d9d2f187759d0154574657c195068d367c338473Michael J. Spencer if (MaxAlignment >= 2) 7236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines R.reset(new ELFObjectFile<ELFType<support::little, 2, true> >( 7336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines Obj, EC, BufferOwned)); 744d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer else 754d9c5397b4a3be747bdb73f1d24c3fdbaaf438feMichael J. Spencer llvm_unreachable("Invalid alignment for ELF file!"); 76bfbbe328371772a1b8408066f976a374b379e684Nick Lewycky } 7736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines else 7836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines report_fatal_error("Buffer is not an ELF object file!"); 794344b1ef9b3721a5ebc2e024f753772a1e4ddd92Michael J. Spencer 8036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines if (EC) 8136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines return EC; 8236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines return R.release(); 830fcab076f0358890e2f1b213f4303c780e05d99dBenjamin Kramer} 840fcab076f0358890e2f1b213f4303c780e05d99dBenjamin Kramer 85b84551a14f1c96942eb82408652e633543b0961eMichael J. Spencer} // end namespace llvm 86