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b138caba43
This makes the buffer ownership on error conditions very natural. The buffer is only moved out of the argument if an object is constructed that now owns the buffer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211546 91177308-0d34-0410-b5e6-96231b3b80d8
86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
//===- ELFObjectFile.cpp - ELF object file implementation -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Part of the ELFObjectFile class implementation.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Object/ELFObjectFile.h"
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#include "llvm/Support/MathExtras.h"
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namespace llvm {
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using namespace object;
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ErrorOr<ObjectFile *>
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ObjectFile::createELFObjectFile(std::unique_ptr<MemoryBuffer> &Obj) {
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std::pair<unsigned char, unsigned char> Ident = getElfArchType(Obj.get());
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std::size_t MaxAlignment =
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1ULL << countTrailingZeros(uintptr_t(Obj->getBufferStart()));
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std::error_code EC;
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std::unique_ptr<ObjectFile> R;
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if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB)
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#if !LLVM_IS_UNALIGNED_ACCESS_FAST
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if (MaxAlignment >= 4)
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R.reset(new ELFObjectFile<ELFType<support::little, 4, false>>(
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Obj.release(), EC));
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else
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#endif
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if (MaxAlignment >= 2)
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R.reset(new ELFObjectFile<ELFType<support::little, 2, false>>(
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Obj.release(), EC));
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else
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return object_error::parse_failed;
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else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB)
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#if !LLVM_IS_UNALIGNED_ACCESS_FAST
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if (MaxAlignment >= 4)
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R.reset(new ELFObjectFile<ELFType<support::big, 4, false>>(Obj.release(),
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EC));
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else
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#endif
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if (MaxAlignment >= 2)
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R.reset(new ELFObjectFile<ELFType<support::big, 2, false>>(Obj.release(),
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EC));
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else
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return object_error::parse_failed;
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else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB)
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#if !LLVM_IS_UNALIGNED_ACCESS_FAST
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if (MaxAlignment >= 8)
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R.reset(
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new ELFObjectFile<ELFType<support::big, 8, true>>(Obj.release(), EC));
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else
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#endif
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if (MaxAlignment >= 2)
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R.reset(
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new ELFObjectFile<ELFType<support::big, 2, true>>(Obj.release(), EC));
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else
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return object_error::parse_failed;
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else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) {
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#if !LLVM_IS_UNALIGNED_ACCESS_FAST
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if (MaxAlignment >= 8)
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R.reset(new ELFObjectFile<ELFType<support::little, 8, true>>(
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Obj.release(), EC));
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else
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#endif
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if (MaxAlignment >= 2)
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R.reset(new ELFObjectFile<ELFType<support::little, 2, true>>(
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Obj.release(), EC));
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else
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return object_error::parse_failed;
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}
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else
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llvm_unreachable("Buffer is not an ELF object file!");
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if (EC)
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return EC;
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return R.release();
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}
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} // end namespace llvm
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