322d0df309
The base class ELFObjectReader/ELFDSOReader implement the canParse functionaity with this change. llvm-svn: 220261
103 lines
3.2 KiB
C++
103 lines
3.2 KiB
C++
//===- lib/ReaderWriter/ELF/ELFReader.h -----------------------------------===//
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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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#ifndef LLD_READER_WRITER_ELF_READER_H
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#define LLD_READER_WRITER_ELF_READER_H
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#include "CreateELF.h"
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#include "DynamicFile.h"
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#include "ELFFile.h"
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#include "lld/ReaderWriter/Reader.h"
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namespace lld {
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namespace elf {
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template <typename ELFT, typename ELFTraitsT>
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class ELFObjectReader : public Reader {
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public:
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typedef llvm::object::Elf_Ehdr_Impl<ELFT> Elf_Ehdr;
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ELFObjectReader(bool atomizeStrings, uint64_t machine)
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: _atomizeStrings(atomizeStrings), _machine(machine) {}
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bool canParse(file_magic magic, StringRef,
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const MemoryBuffer &buf) const override {
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return (magic == llvm::sys::fs::file_magic::elf_relocatable &&
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elfHeader(buf)->e_machine == _machine);
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}
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std::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 =
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createELF<ELFTraitsT>(llvm::object::getElfArchType(mb->getBuffer()),
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maxAlignment, std::move(mb), _atomizeStrings);
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if (std::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 std::error_code();
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}
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const Elf_Ehdr *elfHeader(const MemoryBuffer &buf) const {
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const uint8_t *data =
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reinterpret_cast<const uint8_t *>(buf.getBuffer().data());
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return (reinterpret_cast<const Elf_Ehdr *>(data));
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}
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protected:
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bool _atomizeStrings;
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uint64_t _machine;
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};
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template <typename ELFT, typename ELFTraitsT>
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class ELFDSOReader : public Reader {
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public:
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typedef llvm::object::Elf_Ehdr_Impl<ELFT> Elf_Ehdr;
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ELFDSOReader(bool useUndefines, uint64_t machine)
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: _useUndefines(useUndefines), _machine(machine) {}
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bool canParse(file_magic magic, StringRef,
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const MemoryBuffer &buf) const override {
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return (magic == llvm::sys::fs::file_magic::elf_shared_object &&
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elfHeader(buf)->e_machine == _machine);
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}
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std::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 =
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createELF<ELFTraitsT>(llvm::object::getElfArchType(mb->getBuffer()),
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maxAlignment, std::move(mb), _useUndefines);
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if (std::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 std::error_code();
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}
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const Elf_Ehdr *elfHeader(const MemoryBuffer &buf) const {
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const uint8_t *data =
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reinterpret_cast<const uint8_t *>(buf.getBuffer().data());
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return (reinterpret_cast<const Elf_Ehdr *>(data));
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}
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protected:
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bool _useUndefines;
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uint64_t _machine;
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};
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} // namespace elf
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} // namespace lld
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#endif // LLD_READER_WRITER_ELF_READER_H
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