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 ErrorOr<ObjectFile *> ObjectFile::createELFObjectFile(MemoryBuffer *Obj) {
21 std::pair<unsigned char, unsigned char> Ident = getElfArchType(Obj);
22 std::size_t MaxAlignment =
23 1ULL << countTrailingZeros(uintptr_t(Obj->getBufferStart()));
26 OwningPtr<ObjectFile> R;
27 if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB)
28 #if !LLVM_IS_UNALIGNED_ACCESS_FAST
29 if (MaxAlignment >= 4)
30 R.reset(new ELFObjectFile<ELFType<support::little, 4, false> >(Obj, EC));
33 if (MaxAlignment >= 2)
34 R.reset(new ELFObjectFile<ELFType<support::little, 2, false> >(Obj, EC));
36 llvm_unreachable("Invalid alignment for ELF file!");
37 else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB)
38 #if !LLVM_IS_UNALIGNED_ACCESS_FAST
39 if (MaxAlignment >= 4)
40 R.reset(new ELFObjectFile<ELFType<support::big, 4, false> >(Obj, EC));
43 if (MaxAlignment >= 2)
44 R.reset(new ELFObjectFile<ELFType<support::big, 2, false> >(Obj, EC));
46 llvm_unreachable("Invalid alignment for ELF file!");
47 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB)
48 #if !LLVM_IS_UNALIGNED_ACCESS_FAST
49 if (MaxAlignment >= 8)
50 R.reset(new ELFObjectFile<ELFType<support::big, 8, true> >(Obj, EC));
53 if (MaxAlignment >= 2)
54 R.reset(new ELFObjectFile<ELFType<support::big, 2, true> >(Obj, EC));
56 llvm_unreachable("Invalid alignment for ELF file!");
57 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) {
58 #if !LLVM_IS_UNALIGNED_ACCESS_FAST
59 if (MaxAlignment >= 8)
60 R.reset(new ELFObjectFile<ELFType<support::little, 8, true> >(Obj, EC));
63 if (MaxAlignment >= 2)
64 R.reset(new ELFObjectFile<ELFType<support::little, 2, true> >(Obj, EC));
66 llvm_unreachable("Invalid alignment for ELF file!");
69 report_fatal_error("Buffer is not an ELF object file!");
76 } // end namespace llvm