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