f785676f2a
all of the features in the current working draft of the upcoming C++ standard, provisionally named C++1y. The code generator's performance is greatly increased, and the loop auto-vectorizer is now enabled at -Os and -O2 in addition to -O3. The PowerPC backend has made several major improvements to code generation quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ backends have all seen major feature work. Release notes for llvm and clang can be found here: <http://llvm.org/releases/3.4/docs/ReleaseNotes.html> <http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html> MFC after: 1 month
74 lines
2.6 KiB
C++
74 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/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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// 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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