93 lines
2.4 KiB
C++
93 lines
2.4 KiB
C++
/*
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* Copyright (C) 2019 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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#pragma once
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#include <pthread.h>
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#include <stdint.h>
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#include <memory>
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#include <mutex>
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#include <optional>
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#include <unordered_map>
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#include <unwindstack/Memory.h>
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namespace unwindstack {
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class MemoryCacheBase : public Memory {
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public:
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MemoryCacheBase(Memory* memory) : impl_(memory) {}
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virtual ~MemoryCacheBase() = default;
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MemoryCacheBase* AsMemoryCacheBase() override { return this; }
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const std::shared_ptr<Memory>& UnderlyingMemory() { return impl_; }
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size_t Read(uint64_t addr, void* dst, size_t size) override {
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// Only look at the cache for small reads.
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if (size > 64) {
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return impl_->Read(addr, dst, size);
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}
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return CachedRead(addr, dst, size);
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}
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long ReadTag(uint64_t addr) override { return impl_->ReadTag(addr); }
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protected:
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constexpr static size_t kCacheBits = 12;
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constexpr static size_t kCacheMask = (1 << kCacheBits) - 1;
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constexpr static size_t kCacheSize = 1 << kCacheBits;
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using CacheDataType = std::unordered_map<uint64_t, uint8_t[kCacheSize]>;
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virtual size_t CachedRead(uint64_t addr, void* dst, size_t size) = 0;
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size_t InternalCachedRead(uint64_t addr, void* dst, size_t size, CacheDataType* cache);
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std::shared_ptr<Memory> impl_;
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};
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class MemoryCache : public MemoryCacheBase {
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public:
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MemoryCache(Memory* memory) : MemoryCacheBase(memory) {}
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virtual ~MemoryCache() = default;
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size_t CachedRead(uint64_t addr, void* dst, size_t size) override;
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void Clear() override;
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protected:
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CacheDataType cache_;
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std::mutex cache_lock_;
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};
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class MemoryThreadCache : public MemoryCacheBase {
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public:
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MemoryThreadCache(Memory* memory);
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virtual ~MemoryThreadCache();
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size_t CachedRead(uint64_t addr, void* dst, size_t size) override;
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void Clear() override;
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protected:
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std::optional<pthread_key_t> thread_cache_;
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};
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} // namespace unwindstack
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