forked from OSchip/llvm-project
87 lines
3.0 KiB
C++
87 lines
3.0 KiB
C++
//===- 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;
|
|
|
|
ErrorOr<std::unique_ptr<ObjectFile>>
|
|
ObjectFile::createELFObjectFile(std::unique_ptr<MemoryBuffer> &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>>(
|
|
std::move(Obj), EC));
|
|
else
|
|
#endif
|
|
if (MaxAlignment >= 2)
|
|
R.reset(new ELFObjectFile<ELFType<support::little, 2, false>>(
|
|
std::move(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>>(std::move(Obj),
|
|
EC));
|
|
else
|
|
#endif
|
|
if (MaxAlignment >= 2)
|
|
R.reset(new ELFObjectFile<ELFType<support::big, 2, false>>(std::move(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>>(std::move(Obj),
|
|
EC));
|
|
else
|
|
#endif
|
|
if (MaxAlignment >= 2)
|
|
R.reset(new ELFObjectFile<ELFType<support::big, 2, true>>(std::move(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>>(
|
|
std::move(Obj), EC));
|
|
else
|
|
#endif
|
|
if (MaxAlignment >= 2)
|
|
R.reset(new ELFObjectFile<ELFType<support::little, 2, true>>(
|
|
std::move(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
|