137 lines
3.8 KiB
C++
137 lines
3.8 KiB
C++
/* libs/pixelflinger/codeflinger/CodeCache.h
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**
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** Copyright 2006, 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 ANDROID_CODECACHE_H
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#define ANDROID_CODECACHE_H
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#include <atomic>
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#include <stdint.h>
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#include <pthread.h>
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#include <sys/types.h>
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#include "utils/KeyedVector.h"
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#include "tinyutils/smartpointer.h"
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namespace android {
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using namespace tinyutils;
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// ----------------------------------------------------------------------------
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class AssemblyKeyBase {
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public:
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virtual ~AssemblyKeyBase() { }
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virtual int compare_type(const AssemblyKeyBase& key) const = 0;
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};
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template <typename T>
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class AssemblyKey : public AssemblyKeyBase
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{
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public:
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explicit AssemblyKey(const T& rhs) : mKey(rhs) { }
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virtual int compare_type(const AssemblyKeyBase& key) const {
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const T& rhs = static_cast<const AssemblyKey&>(key).mKey;
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return android::compare_type(mKey, rhs);
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}
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private:
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T mKey;
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};
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// ----------------------------------------------------------------------------
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class Assembly
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{
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public:
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explicit Assembly(size_t size);
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virtual ~Assembly();
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ssize_t size() const;
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uint32_t* base() const;
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ssize_t resize(size_t size);
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// protocol for sp<>
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void incStrong(const void* id) const;
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void decStrong(const void* id) const;
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typedef void weakref_type;
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private:
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mutable std::atomic<int32_t> mCount;
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uint32_t* mBase;
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size_t mSize;
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};
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// ----------------------------------------------------------------------------
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class CodeCache
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{
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public:
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// pretty simple cache API...
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explicit CodeCache(size_t size);
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~CodeCache();
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sp<Assembly> lookup(const AssemblyKeyBase& key) const;
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int cache(const AssemblyKeyBase& key,
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const sp<Assembly>& assembly);
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private:
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// nothing to see here...
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struct cache_entry_t {
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inline cache_entry_t() { }
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inline cache_entry_t(const sp<Assembly>& a, int64_t w)
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: entry(a), when(w) { }
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sp<Assembly> entry;
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mutable int64_t when;
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};
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class key_t {
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friend int compare_type(
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const key_value_pair_t<key_t, cache_entry_t>&,
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const key_value_pair_t<key_t, cache_entry_t>&);
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const AssemblyKeyBase* mKey;
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public:
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key_t() { };
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explicit key_t(const AssemblyKeyBase& k) : mKey(&k) { }
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};
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mutable pthread_mutex_t mLock;
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mutable int64_t mWhen;
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size_t mCacheSize;
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size_t mCacheInUse;
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KeyedVector<key_t, cache_entry_t> mCacheData;
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friend int compare_type(
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const key_value_pair_t<key_t, cache_entry_t>&,
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const key_value_pair_t<key_t, cache_entry_t>&);
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};
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// KeyedVector uses compare_type(), which is more efficient, than
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// just using operator < ()
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inline int compare_type(
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const key_value_pair_t<CodeCache::key_t, CodeCache::cache_entry_t>& lhs,
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const key_value_pair_t<CodeCache::key_t, CodeCache::cache_entry_t>& rhs)
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{
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return lhs.key.mKey->compare_type(*(rhs.key.mKey));
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}
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// ----------------------------------------------------------------------------
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}; // namespace android
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#endif //ANDROID_CODECACHE_H
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