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
17 namespace llvm {
18 using namespace object;
19
ELFObjectFileBase(unsigned int Type,MemoryBufferRef Source)20 ELFObjectFileBase::ELFObjectFileBase(unsigned int Type, MemoryBufferRef Source)
21 : ObjectFile(Type, Source) {}
22
23 ErrorOr<std::unique_ptr<ObjectFile>>
createELFObjectFile(MemoryBufferRef Obj)24 ObjectFile::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