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/*
* Copyright (C) 2018 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_DEX_FILE_H
#define _LIBUNWINDSTACK_DEX_FILE_H
#include <stdint.h>
#include <map>
#include <memory>
#include <mutex>
#include <string>
#include <utility>
#include <vector>
#include <unwindstack/SharedString.h>
#include <art_api/dex_file_support.h>
namespace unwindstack {
class MapInfo;
class Memory;
class DexFile {
struct Info {
uint32_t offset; // Symbol start offset (relative to start of dex file).
SharedString name;
};
public:
bool IsValidPc(uint64_t dex_pc) {
return base_addr_ <= dex_pc && (dex_pc - base_addr_) < file_size_;
}
bool GetFunctionName(uint64_t dex_pc, SharedString* method_name, uint64_t* method_offset);
static std::shared_ptr<DexFile> Create(uint64_t base_addr, uint64_t file_size, Memory* memory,
MapInfo* info);
private:
// The underlying C API. It might be shared by multiple DexFiles (with different base_addr).
struct DexFileApi {
std::unique_ptr<art_api::dex::DexFile> dex_;
std::unique_ptr<Memory> memory_; // Keep alive the memory object backing the dex file data.
std::mutex lock_; // The C API is not thread-safe so we need to lock it.
};
static std::shared_ptr<DexFile> CreateFromDisk(uint64_t addr, uint64_t size, MapInfo* map);
DexFile(uint64_t base_addr, uint64_t file_size, std::shared_ptr<DexFileApi>&& dex_api)
: base_addr_(base_addr), file_size_(file_size), dex_api_(std::move(dex_api)) {}
uint64_t base_addr_ = 0; // Absolute address where this DEX file is in memory.
uint64_t file_size_ = 0; // Total number of bytes in the dex file.
std::shared_ptr<DexFileApi> dex_api_; // Loaded underling dex object.
std::map<uint32_t, Info> symbols_; // Cache of read symbols (keyed by *end* offset).
// The same file can be mapped many times in system-wide profiling (once per process).
// Furthermore, the ART side of the API will create expensive PC lookup table for it.
// Therefore, we maintain cache to avoid loading the same file (sub-range) many times.
// The cache is weak: It will not keep DexFiles alive (the weak_ptr will become null).
using MappedFileKey = std::tuple<std::string, uint64_t, uint64_t>; // (path, offset, size).
static std::map<MappedFileKey, std::weak_ptr<DexFileApi>> g_mapped_dex_files;
static std::mutex g_lock; // Guards the static cache above.
};
} // namespace unwindstack
#endif // _LIBUNWINDSTACK_DEX_FILE_H
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