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* Copyright (C) 2012 The Android Open Source Project
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <memory>
#include <string>
#include "base/macros.h"
// Explicitly include our own elf.h to avoid Linux and other dependencies.
#include "./elf.h"
#include "os.h"
namespace art {
template <typename ElfTypes>
class ElfFileImpl;
// Explicitly instantiated in
typedef ElfFileImpl<ElfTypes32> ElfFileImpl32;
typedef ElfFileImpl<ElfTypes64> ElfFileImpl64;
// Used for compile time and runtime for ElfFile access. Because of
// the need for use at runtime, cannot directly use LLVM classes such as
// ELFObjectFile.
class ElfFile {
static ElfFile* Open(File* file,
bool writable,
bool program_header_only,
bool low_4gb,
std::string* error_msg,
uint8_t* requested_base = nullptr); // TODO: move arg to before error_msg.
// Open with specific mmap flags, Always maps in the whole file, not just the
// program header sections.
static ElfFile* Open(File* file,
int mmap_prot,
int mmap_flags,
std::string* error_msg);
// Load segments into memory based on PT_LOAD program headers
bool Load(bool executable, bool low_4gb, std::string* error_msg);
const uint8_t* FindDynamicSymbolAddress(const std::string& symbol_name) const;
size_t Size() const;
// The start of the memory map address range for this ELF file.
uint8_t* Begin() const;
// The end of the memory map address range for this ELF file.
uint8_t* End() const;
const File& GetFile() const;
bool GetSectionOffsetAndSize(const char* section_name, uint64_t* offset, uint64_t* size) const;
bool HasSection(const std::string& name) const;
uint64_t FindSymbolAddress(unsigned section_type,
const std::string& symbol_name,
bool build_map);
bool GetLoadedSize(size_t* size, std::string* error_msg) const;
// Strip an ELF file of unneeded debugging information.
// Returns true on success, false on failure.
static bool Strip(File* file, std::string* error_msg);
// Fixup an ELF file so that that oat header will be loaded at oat_begin.
// Returns true on success, false on failure.
static bool Fixup(File* file, uint64_t oat_data_begin);
bool Fixup(uint64_t base_address);
bool Is64Bit() const {
return elf64_.get() != nullptr;
ElfFileImpl32* GetImpl32() const {
return elf32_.get();
ElfFileImpl64* GetImpl64() const {
return elf64_.get();
explicit ElfFile(ElfFileImpl32* elf32);
explicit ElfFile(ElfFileImpl64* elf64);
const std::unique_ptr<ElfFileImpl32> elf32_;
const std::unique_ptr<ElfFileImpl64> elf64_;
} // namespace art