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85 lines
3.0 KiB
85 lines
3.0 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _LIBUNWINDSTACK_DEX_FILE_H
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#define _LIBUNWINDSTACK_DEX_FILE_H
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#include <stdint.h>
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#include <map>
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#include <memory>
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#include <mutex>
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#include <string>
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#include <utility>
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#include <vector>
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#include <unwindstack/SharedString.h>
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#include <art_api/dex_file_support.h>
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namespace unwindstack {
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class MapInfo;
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class Memory;
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class DexFile {
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struct Info {
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uint32_t offset; // Symbol start offset (relative to start of dex file).
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SharedString name;
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};
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public:
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bool IsValidPc(uint64_t dex_pc) {
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return base_addr_ <= dex_pc && (dex_pc - base_addr_) < file_size_;
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}
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bool GetFunctionName(uint64_t dex_pc, SharedString* method_name, uint64_t* method_offset);
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static std::shared_ptr<DexFile> Create(uint64_t base_addr, uint64_t file_size, Memory* memory,
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MapInfo* info);
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private:
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// The underlying C API. It might be shared by multiple DexFiles (with different base_addr).
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struct DexFileApi {
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std::unique_ptr<art_api::dex::DexFile> dex_;
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std::unique_ptr<Memory> memory_; // Keep alive the memory object backing the dex file data.
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std::mutex lock_; // The C API is not thread-safe so we need to lock it.
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};
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static std::shared_ptr<DexFile> CreateFromDisk(uint64_t addr, uint64_t size, MapInfo* map);
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DexFile(uint64_t base_addr, uint64_t file_size, std::shared_ptr<DexFileApi>&& dex_api)
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: base_addr_(base_addr), file_size_(file_size), dex_api_(std::move(dex_api)) {}
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uint64_t base_addr_ = 0; // Absolute address where this DEX file is in memory.
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uint64_t file_size_ = 0; // Total number of bytes in the dex file.
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std::shared_ptr<DexFileApi> dex_api_; // Loaded underling dex object.
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std::map<uint32_t, Info> symbols_; // Cache of read symbols (keyed by *end* offset).
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// The same file can be mapped many times in system-wide profiling (once per process).
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// Furthermore, the ART side of the API will create expensive PC lookup table for it.
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// Therefore, we maintain cache to avoid loading the same file (sub-range) many times.
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// The cache is weak: It will not keep DexFiles alive (the weak_ptr will become null).
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using MappedFileKey = std::tuple<std::string, uint64_t, uint64_t>; // (path, offset, size).
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static std::map<MappedFileKey, std::weak_ptr<DexFileApi>> g_mapped_dex_files;
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static std::mutex g_lock; // Guards the static cache above.
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};
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} // namespace unwindstack
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#endif // _LIBUNWINDSTACK_DEX_FILE_H
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