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/*
* Copyright (C) 2016 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _LIBUNWINDSTACK_MAP_INFO_H
#define _LIBUNWINDSTACK_MAP_INFO_H
#include <stdint.h>
#include <atomic>
#include <memory>
#include <mutex>
#include <string>
#include <unwindstack/Elf.h>
namespace unwindstack {
// Forward declarations.
class Maps;
class Memory;
struct MapInfo {
MapInfo(Maps* maps) : maps_(maps) {}
MapInfo(Maps* maps, uint64_t start, uint64_t end) : maps_(maps), start(start), end(end) {}
MapInfo(Maps* maps, uint64_t start, uint64_t end, uint64_t offset, uint64_t flags,
const char* name)
: maps_(maps),
start(start),
end(end),
offset(offset),
flags(flags),
name(name),
load_bias(static_cast<uint64_t>(-1)) {}
MapInfo(Maps* maps, uint64_t start, uint64_t end, uint64_t offset, uint64_t flags,
const std::string& name)
: maps_(maps),
start(start),
end(end),
offset(offset),
flags(flags),
name(name),
load_bias(static_cast<uint64_t>(-1)) {}
~MapInfo() = default;
Maps* maps_ = nullptr;
uint64_t start = 0;
uint64_t end = 0;
uint64_t offset = 0;
uint16_t flags = 0;
std::string name;
std::shared_ptr<Elf> elf;
// This value is only non-zero if the offset is non-zero but there is
// no elf signature found at that offset. This indicates that the
// entire file is represented by the Memory object returned by CreateMemory,
// instead of a portion of the file.
uint64_t elf_offset = 0;
std::atomic_uint64_t load_bias;
// This function guarantees it will never return nullptr.
Elf* GetElf(const std::shared_ptr<Memory>& process_memory, ArchEnum expected_arch);
uint64_t GetLoadBias(const std::shared_ptr<Memory>& process_memory);
Memory* CreateMemory(const std::shared_ptr<Memory>& process_memory);
private:
MapInfo(const MapInfo&) = delete;
void operator=(const MapInfo&) = delete;
Memory* GetFileMemory();
bool InitFileMemoryFromPreviousReadOnlyMap(MemoryFileAtOffset* memory);
// Protect the creation of the elf object.
std::mutex mutex_;
};
} // namespace unwindstack
#endif // _LIBUNWINDSTACK_MAP_INFO_H
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