139 lines
4.1 KiB
C++
139 lines
4.1 KiB
C++
//===- lib/ReaderWriter/ELF/Reader.cpp ------------------------------------===//
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//
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// The LLVM Linker
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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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/// \file
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/// \brief Defines the ELF Reader and all helper sub classes to consume an ELF
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/// file and produces atoms out of it.
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///
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//===----------------------------------------------------------------------===//
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#include "lld/ReaderWriter/Reader.h"
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#include "Atoms.h"
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#include "CreateELF.h"
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#include "DynamicFile.h"
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#include "File.h"
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#include "lld/Core/Reference.h"
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#include "lld/ReaderWriter/ELFTargetInfo.h"
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#include "lld/ReaderWriter/ReaderArchive.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Object/ELF.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/Allocator.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/ErrorOr.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/Memory.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/system_error.h"
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#include <map>
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#include <vector>
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using llvm::support::endianness;
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using namespace llvm::object;
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namespace {
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struct DynamicFileCreateELFTraits {
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typedef llvm::ErrorOr<std::unique_ptr<lld::SharedLibraryFile>> result_type;
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template <class ELFT>
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static result_type create(const lld::ELFTargetInfo &ti,
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std::unique_ptr<llvm::MemoryBuffer> mb) {
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return lld::elf::DynamicFile<ELFT>::create(ti, std::move(mb));
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}
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};
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struct ELFFileCreateELFTraits {
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typedef std::unique_ptr<lld::File> result_type;
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template <class ELFT>
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static result_type create(const lld::ELFTargetInfo &ti,
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std::unique_ptr<llvm::MemoryBuffer> mb,
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lld::error_code &ec) {
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return std::unique_ptr<lld::File>(
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new lld::elf::ELFFile<ELFT>(ti, std::move(mb), ec));
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}
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};
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}
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namespace lld {
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namespace elf {
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/// \brief A reader object that will instantiate correct File by examining the
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/// memory buffer for ELF class and bit width
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class ELFReader : public Reader {
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public:
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ELFReader(const ELFTargetInfo &ti, std::function<ReaderFunc> read)
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: lld::Reader(ti), _elfTargetInfo(ti), _readerArchive(ti, read) {
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}
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error_code parseFile(std::unique_ptr<MemoryBuffer> mb,
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std::vector<std::unique_ptr<File> > &result) {
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using llvm::object::ELFType;
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llvm::sys::LLVMFileType fileType =
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llvm::sys::IdentifyFileType(mb->getBufferStart(),
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static_cast<unsigned>(mb->getBufferSize()));
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std::size_t MaxAlignment =
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1ULL << llvm::CountTrailingZeros_64(uintptr_t(mb->getBufferStart()));
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llvm::error_code ec;
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switch (fileType) {
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case llvm::sys::ELF_Relocatable_FileType: {
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std::unique_ptr<File> f(createELF<ELFFileCreateELFTraits>(
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getElfArchType(&*mb), MaxAlignment, _elfTargetInfo, std::move(mb),
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ec));
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if (ec)
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return ec;
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result.push_back(std::move(f));
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break;
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}
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case llvm::sys::ELF_SharedObject_FileType: {
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auto f = createELF<DynamicFileCreateELFTraits>(
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getElfArchType(&*mb), MaxAlignment, _elfTargetInfo, std::move(mb));
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if (!f)
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return f;
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result.push_back(std::move(*f));
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break;
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}
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case llvm::sys::Archive_FileType:
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ec = _readerArchive.parseFile(std::move(mb), result);
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break;
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default:
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llvm_unreachable("not supported format");
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break;
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}
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if (ec)
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return ec;
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return error_code::success();
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}
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private:
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const ELFTargetInfo &_elfTargetInfo;
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ReaderArchive _readerArchive;
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};
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} // end namespace elf
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std::unique_ptr<Reader> createReaderELF(const ELFTargetInfo &eti,
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std::function<ReaderFunc> read) {
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return std::unique_ptr<Reader>(new elf::ELFReader(eti, std::move(read)));
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}
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} // end namespace lld
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