1//===- ELFObjectFile.cpp - ELF object file implementation -------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// Part of the ELFObjectFile class implementation.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/Object/ELFObjectFile.h"
15#include "llvm/Support/MathExtras.h"
16
17namespace llvm {
18using namespace object;
19
20ELFObjectFileBase::ELFObjectFileBase(unsigned int Type, MemoryBufferRef Source)
21    : ObjectFile(Type, Source) {}
22
23ErrorOr<std::unique_ptr<ObjectFile>>
24ObjectFile::createELFObjectFile(MemoryBufferRef Obj) {
25  std::pair<unsigned char, unsigned char> Ident =
26      getElfArchType(Obj.getBuffer());
27  std::size_t MaxAlignment =
28      1ULL << countTrailingZeros(uintptr_t(Obj.getBufferStart()));
29
30  if (MaxAlignment < 2)
31    return object_error::parse_failed;
32
33  std::error_code EC;
34  std::unique_ptr<ObjectFile> R;
35  if (Ident.first == ELF::ELFCLASS32) {
36    if (Ident.second == ELF::ELFDATA2LSB)
37      R.reset(new ELFObjectFile<ELFType<support::little, false>>(Obj, EC));
38    else if (Ident.second == ELF::ELFDATA2MSB)
39      R.reset(new ELFObjectFile<ELFType<support::big, false>>(Obj, EC));
40    else
41      return object_error::parse_failed;
42  } else if (Ident.first == ELF::ELFCLASS64) {
43    if (Ident.second == ELF::ELFDATA2LSB)
44      R.reset(new ELFObjectFile<ELFType<support::little, true>>(Obj, EC));
45    else if (Ident.second == ELF::ELFDATA2MSB)
46      R.reset(new ELFObjectFile<ELFType<support::big, true>>(Obj, EC));
47    else
48      return object_error::parse_failed;
49  } else {
50    return object_error::parse_failed;
51  }
52
53  if (EC)
54    return EC;
55  return std::move(R);
56}
57
58} // end namespace llvm
59