16e543bc02
For the record, I used clang-modernize to add "override" and perl to remove "virtual". llvm-svn: 203164
123 lines
4.0 KiB
C++
123 lines
4.0 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 "ELFReader.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 lld {
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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(std::unique_ptr<llvm::MemoryBuffer> mb,
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bool useUndefines) {
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return lld::elf::DynamicFile<ELFT>::create(std::move(mb), useUndefines);
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}
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};
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struct ELFFileCreateELFTraits {
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typedef llvm::ErrorOr<std::unique_ptr<lld::File>> result_type;
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template <class ELFT>
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static result_type create(std::unique_ptr<llvm::MemoryBuffer> mb,
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bool atomizeStrings) {
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return lld::elf::ELFFile<ELFT>::create(std::move(mb), atomizeStrings);
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}
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};
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class ELFObjectReader : public Reader {
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public:
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ELFObjectReader(bool atomizeStrings) : _atomizeStrings(atomizeStrings) {}
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virtual bool canParse(file_magic magic, StringRef,
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const MemoryBuffer &) const override {
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return (magic == llvm::sys::fs::file_magic::elf_relocatable);
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}
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virtual error_code
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parseFile(std::unique_ptr<MemoryBuffer> &mb, const class Registry &,
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std::vector<std::unique_ptr<File>> &result) const override {
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error_code ec;
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std::size_t maxAlignment =
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1ULL << llvm::countTrailingZeros(uintptr_t(mb->getBufferStart()));
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auto f = createELF<ELFFileCreateELFTraits>(
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getElfArchType(&*mb), maxAlignment, std::move(mb), _atomizeStrings);
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if (error_code ec = f.getError())
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return ec;
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result.push_back(std::move(*f));
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return error_code::success();
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}
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private:
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bool _atomizeStrings;
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};
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class ELFDSOReader : public Reader {
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public:
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ELFDSOReader(bool useUndefines) : _useUndefines(useUndefines) {}
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virtual bool canParse(file_magic magic, StringRef,
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const MemoryBuffer &) const override {
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return (magic == llvm::sys::fs::file_magic::elf_shared_object);
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}
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virtual error_code
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parseFile(std::unique_ptr<MemoryBuffer> &mb, const class Registry &,
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std::vector<std::unique_ptr<File>> &result) const override {
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std::size_t maxAlignment =
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1ULL << llvm::countTrailingZeros(uintptr_t(mb->getBufferStart()));
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auto f = createELF<DynamicFileCreateELFTraits>(
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getElfArchType(&*mb), maxAlignment, std::move(mb), _useUndefines);
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if (error_code ec = f.getError())
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return ec;
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result.push_back(std::move(*f));
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return error_code::success();
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}
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private:
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bool _useUndefines;
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};
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} // anonymous
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// This dynamic registration of a handler causes support for all ELF
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// architectures to be pulled into the linker. If we want to support making a
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// linker that only supports one ELF architecture, we'd need to change this
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// to have a different registration method for each architecture.
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void Registry::addSupportELFObjects(bool atomizeStrings,
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TargetHandlerBase *handler) {
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// Tell registry about the ELF object file parser.
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add(std::move(handler->getObjReader(atomizeStrings)));
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// Tell registry about the relocation name to number mapping for this arch.
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handler->registerRelocationNames(*this);
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}
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void Registry::addSupportELFDynamicSharedObjects(bool useShlibUndefines,
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TargetHandlerBase *handler) {
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// Tell registry about the ELF dynamic shared library file parser.
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add(handler->getDSOReader(useShlibUndefines));
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}
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} // end namespace lld
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