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548f2b6e8f
Owning the buffer is somewhat inflexible. Some Binaries have sub Binaries (like Archive) and we had to create dummy buffers just to handle that. It is also a bad fit for IRObjectFile where the Module wants to own the buffer too. Keeping this ownership would make supporting IR inside native objects particularly painful. This patch focuses in lib/Object. If something elsewhere used to own an Binary, now it also owns a MemoryBuffer. This patch introduces a few new types. * MemoryBufferRef. This is just a pair of StringRefs for the data and name. This is to MemoryBuffer as StringRef is to std::string. * OwningBinary. A combination of Binary and a MemoryBuffer. This is needed for convenience functions that take a filename and return both the buffer and the Binary using that buffer. The C api now uses OwningBinary to avoid any change in semantics. I will start a new thread to see if we want to change it and how. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216002 91177308-0d34-0410-b5e6-96231b3b80d8
82 lines
2.7 KiB
C++
82 lines
2.7 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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ELFObjectFileBase::ELFObjectFileBase(unsigned int Type, MemoryBufferRef Source)
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: ObjectFile(Type, Source) {}
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ErrorOr<std::unique_ptr<ObjectFile>>
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ObjectFile::createELFObjectFile(MemoryBufferRef Obj) {
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std::pair<unsigned char, unsigned char> Ident =
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getElfArchType(Obj.getBuffer());
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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>>(Obj, 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>>(Obj, 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, 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, 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(new ELFObjectFile<ELFType<support::big, 8, true>>(Obj, 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, true>>(Obj, 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>>(Obj, 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>>(Obj, 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 std::move(R);
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}
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} // end namespace llvm
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