| //===- 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/ELFObjectFile.h" |
| #include "llvm/Support/MathExtras.h" |
| |
| namespace llvm { |
| using namespace object; |
| |
| ELFObjectFileBase::ELFObjectFileBase(unsigned int Type, MemoryBufferRef Source) |
| : ObjectFile(Type, Source) {} |
| |
| ErrorOr<std::unique_ptr<ObjectFile>> |
| ObjectFile::createELFObjectFile(MemoryBufferRef Obj) { |
| std::pair<unsigned char, unsigned char> Ident = |
| getElfArchType(Obj.getBuffer()); |
| std::size_t MaxAlignment = |
| 1ULL << countTrailingZeros(uintptr_t(Obj.getBufferStart())); |
| |
| std::error_code EC; |
| std::unique_ptr<ObjectFile> R; |
| if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB) |
| #if !LLVM_IS_UNALIGNED_ACCESS_FAST |
| if (MaxAlignment >= 4) |
| R.reset(new ELFObjectFile<ELFType<support::little, 4, false>>(Obj, EC)); |
| else |
| #endif |
| if (MaxAlignment >= 2) |
| R.reset(new ELFObjectFile<ELFType<support::little, 2, false>>(Obj, EC)); |
| else |
| return object_error::parse_failed; |
| else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB) |
| #if !LLVM_IS_UNALIGNED_ACCESS_FAST |
| if (MaxAlignment >= 4) |
| R.reset(new ELFObjectFile<ELFType<support::big, 4, false>>(Obj, EC)); |
| else |
| #endif |
| if (MaxAlignment >= 2) |
| R.reset(new ELFObjectFile<ELFType<support::big, 2, false>>(Obj, EC)); |
| else |
| return object_error::parse_failed; |
| else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB) |
| #if !LLVM_IS_UNALIGNED_ACCESS_FAST |
| if (MaxAlignment >= 8) |
| R.reset(new ELFObjectFile<ELFType<support::big, 8, true>>(Obj, EC)); |
| else |
| #endif |
| if (MaxAlignment >= 2) |
| R.reset(new ELFObjectFile<ELFType<support::big, 2, true>>(Obj, EC)); |
| else |
| return object_error::parse_failed; |
| else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) { |
| #if !LLVM_IS_UNALIGNED_ACCESS_FAST |
| if (MaxAlignment >= 8) |
| R.reset(new ELFObjectFile<ELFType<support::little, 8, true>>(Obj, EC)); |
| else |
| #endif |
| if (MaxAlignment >= 2) |
| R.reset(new ELFObjectFile<ELFType<support::little, 2, true>>(Obj, EC)); |
| else |
| return object_error::parse_failed; |
| } |
| else |
| llvm_unreachable("Buffer is not an ELF object file!"); |
| |
| if (EC) |
| return EC; |
| return std::move(R); |
| } |
| |
| } // end namespace llvm |