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75 lines
2.6 KiB
C++
75 lines
2.6 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/ELF.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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// Creates an in-memory object-file by default: createELFObjectFile(Buffer)
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ObjectFile *ObjectFile::createELFObjectFile(MemoryBuffer *Object) {
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std::pair<unsigned char, unsigned char> Ident = getElfArchType(Object);
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error_code ec;
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std::size_t MaxAlignment =
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1ULL << countTrailingZeros(uintptr_t(Object->getBufferStart()));
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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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return new ELFObjectFile<ELFType<support::little, 4, false> >(Object, ec);
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else
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#endif
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if (MaxAlignment >= 2)
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return new ELFObjectFile<ELFType<support::little, 2, false> >(Object, ec);
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else
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llvm_unreachable("Invalid alignment for ELF file!");
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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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return new ELFObjectFile<ELFType<support::big, 4, false> >(Object, ec);
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else
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#endif
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if (MaxAlignment >= 2)
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return new ELFObjectFile<ELFType<support::big, 2, false> >(Object, ec);
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else
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llvm_unreachable("Invalid alignment for ELF file!");
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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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return new ELFObjectFile<ELFType<support::big, 8, true> >(Object, ec);
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else
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#endif
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if (MaxAlignment >= 2)
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return new ELFObjectFile<ELFType<support::big, 2, true> >(Object, ec);
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else
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llvm_unreachable("Invalid alignment for ELF file!");
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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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return new ELFObjectFile<ELFType<support::little, 8, true> >(Object, ec);
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else
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#endif
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if (MaxAlignment >= 2)
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return new ELFObjectFile<ELFType<support::little, 2, true> >(Object, ec);
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else
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llvm_unreachable("Invalid alignment for ELF file!");
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}
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report_fatal_error("Buffer is not an ELF object file!");
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}
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} // end namespace llvm
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