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//===- lib/ReaderWriter/ELF/ELFReader.h -----------------------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLD_READER_WRITER_ELF_READER_H
#define LLD_READER_WRITER_ELF_READER_H
#include "CreateELF.h"
#include "DynamicFile.h"
#include "ELFFile.h"
#include "lld/Core/Reader.h"
namespace lld {
namespace elf {
template <typename ELFT, typename ELFTraitsT>
class ELFObjectReader : public Reader {
public:
typedef llvm::object::Elf_Ehdr_Impl<ELFT> Elf_Ehdr;
ELFObjectReader(bool atomizeStrings, uint64_t machine)
: _atomizeStrings(atomizeStrings), _machine(machine) {}
bool canParse(file_magic magic, StringRef,
const MemoryBuffer &buf) const override {
return (magic == llvm::sys::fs::file_magic::elf_relocatable &&
elfHeader(buf)->e_machine == _machine);
}
std::error_code
loadFile(std::unique_ptr<MemoryBuffer> mb, const class Registry &,
std::vector<std::unique_ptr<File>> &result) const override {
std::size_t maxAlignment =
1ULL << llvm::countTrailingZeros(uintptr_t(mb->getBufferStart()));
auto f =
createELF<ELFTraitsT>(llvm::object::getElfArchType(mb->getBuffer()),
maxAlignment, std::move(mb), _atomizeStrings);
if (std::error_code ec = f.getError())
return ec;
result.push_back(std::move(*f));
return std::error_code();
}
const Elf_Ehdr *elfHeader(const MemoryBuffer &buf) const {
const uint8_t *data =
reinterpret_cast<const uint8_t *>(buf.getBuffer().data());
return (reinterpret_cast<const Elf_Ehdr *>(data));
}
protected:
bool _atomizeStrings;
uint64_t _machine;
};
template <typename ELFT, typename ELFTraitsT>
class ELFDSOReader : public Reader {
public:
typedef llvm::object::Elf_Ehdr_Impl<ELFT> Elf_Ehdr;
ELFDSOReader(bool useUndefines, uint64_t machine)
: _useUndefines(useUndefines), _machine(machine) {}
bool canParse(file_magic magic, StringRef,
const MemoryBuffer &buf) const override {
return (magic == llvm::sys::fs::file_magic::elf_shared_object &&
elfHeader(buf)->e_machine == _machine);
}
std::error_code
loadFile(std::unique_ptr<MemoryBuffer> mb, const class Registry &,
std::vector<std::unique_ptr<File>> &result) const override {
std::size_t maxAlignment =
1ULL << llvm::countTrailingZeros(uintptr_t(mb->getBufferStart()));
auto f =
createELF<ELFTraitsT>(llvm::object::getElfArchType(mb->getBuffer()),
maxAlignment, std::move(mb), _useUndefines);
if (std::error_code ec = f.getError())
return ec;
result.push_back(std::move(*f));
return std::error_code();
}
const Elf_Ehdr *elfHeader(const MemoryBuffer &buf) const {
const uint8_t *data =
reinterpret_cast<const uint8_t *>(buf.getBuffer().data());
return (reinterpret_cast<const Elf_Ehdr *>(data));
}
protected:
bool _useUndefines;
uint64_t _machine;
};
} // namespace elf
} // namespace lld
#endif // LLD_READER_WRITER_ELF_READER_H
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