a96f3a3da4
Changes :- a) Functionality in InputGraph to insert Input elements at any position b) Functionality in the Resolver to use nextFile c) Move the functionality of assigning file ordinals to InputGraph d) Changes all inputs to MemoryBuffers e) Remove LinkerInput, InputFiles, ReaderArchive llvm-svn: 192081
137 lines
4.2 KiB
C++
137 lines
4.2 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/ELFLinkingContext.h"
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#include "lld/ReaderWriter/FileArchive.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::ELFLinkingContext &ctx,
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std::unique_ptr<llvm::MemoryBuffer> mb) {
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return lld::elf::DynamicFile<ELFT>::create(ctx, 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::ELFLinkingContext &ctx,
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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>(ctx, 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 ELFLinkingContext &ctx)
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: lld::Reader(ctx), _elfLinkingContext(ctx) {}
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error_code parseFile(std::unique_ptr<MemoryBuffer> &mb,
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std::vector<std::unique_ptr<File> > &result) const {
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using llvm::object::ELFType;
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llvm::sys::fs::file_magic FileType =
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llvm::sys::fs::identify_magic(mb->getBuffer());
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std::size_t MaxAlignment =
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1ULL << llvm::countTrailingZeros(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::fs::file_magic::elf_relocatable: {
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std::unique_ptr<File> f(createELF<ELFFileCreateELFTraits>(
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getElfArchType(&*mb), MaxAlignment, _elfLinkingContext, 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::fs::file_magic::elf_shared_object: {
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// If the link doesnot allow dynamic libraries to be present during the
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// link, lets not parse the file and just return
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if (!_elfLinkingContext.allowLinkWithDynamicLibraries())
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return llvm::make_error_code(llvm::errc::executable_format_error);
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auto f = createELF<DynamicFileCreateELFTraits>(
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getElfArchType(&*mb), MaxAlignment, _elfLinkingContext,
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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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default:
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return llvm::make_error_code(llvm::errc::executable_format_error);
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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 ELFLinkingContext &_elfLinkingContext;
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};
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} // end namespace elf
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std::unique_ptr<Reader> createReaderELF(const ELFLinkingContext &context) {
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return std::unique_ptr<Reader>(new elf::ELFReader(context));
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}
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} // end namespace lld
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