1 //===- ELFObjectFile.cpp - ELF object file implementation -------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Part of the ELFObjectFile class implementation.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Object/ELFObjectFile.h"
15 #include "llvm/Support/MathExtras.h"
18 using namespace object;
20 ELFObjectFileBase::ELFObjectFileBase(unsigned int Type,
21 std::unique_ptr<MemoryBuffer> Source)
22 : ObjectFile(Type, std::move(Source)) {}
24 ErrorOr<std::unique_ptr<ObjectFile>>
25 ObjectFile::createELFObjectFile(std::unique_ptr<MemoryBuffer> &Obj) {
26 std::pair<unsigned char, unsigned char> Ident =
27 getElfArchType(Obj->getBuffer());
28 std::size_t MaxAlignment =
29 1ULL << countTrailingZeros(uintptr_t(Obj->getBufferStart()));
32 std::unique_ptr<ObjectFile> R;
33 if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB)
34 #if !LLVM_IS_UNALIGNED_ACCESS_FAST
35 if (MaxAlignment >= 4)
36 R.reset(new ELFObjectFile<ELFType<support::little, 4, false>>(
40 if (MaxAlignment >= 2)
41 R.reset(new ELFObjectFile<ELFType<support::little, 2, false>>(
44 return object_error::parse_failed;
45 else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB)
46 #if !LLVM_IS_UNALIGNED_ACCESS_FAST
47 if (MaxAlignment >= 4)
48 R.reset(new ELFObjectFile<ELFType<support::big, 4, false>>(std::move(Obj),
52 if (MaxAlignment >= 2)
53 R.reset(new ELFObjectFile<ELFType<support::big, 2, false>>(std::move(Obj),
56 return object_error::parse_failed;
57 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB)
58 #if !LLVM_IS_UNALIGNED_ACCESS_FAST
59 if (MaxAlignment >= 8)
60 R.reset(new ELFObjectFile<ELFType<support::big, 8, true>>(std::move(Obj),
64 if (MaxAlignment >= 2)
65 R.reset(new ELFObjectFile<ELFType<support::big, 2, true>>(std::move(Obj),
68 return object_error::parse_failed;
69 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) {
70 #if !LLVM_IS_UNALIGNED_ACCESS_FAST
71 if (MaxAlignment >= 8)
72 R.reset(new ELFObjectFile<ELFType<support::little, 8, true>>(
76 if (MaxAlignment >= 2)
77 R.reset(new ELFObjectFile<ELFType<support::little, 2, true>>(
80 return object_error::parse_failed;
83 llvm_unreachable("Buffer is not an ELF object file!");
90 } // end namespace llvm