1/* libs/pixelflinger/codeflinger/CodeCache.h 2** 3** Copyright 2006, The Android Open Source Project 4** 5** Licensed under the Apache License, Version 2.0 (the "License"); 6** you may not use this file except in compliance with the License. 7** You may obtain a copy of the License at 8** 9** http://www.apache.org/licenses/LICENSE-2.0 10** 11** Unless required by applicable law or agreed to in writing, software 12** distributed under the License is distributed on an "AS IS" BASIS, 13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14** See the License for the specific language governing permissions and 15** limitations under the License. 16*/ 17 18 19#ifndef ANDROID_CODECACHE_H 20#define ANDROID_CODECACHE_H 21 22#include <stdint.h> 23#include <pthread.h> 24#include <sys/types.h> 25 26#include "tinyutils/KeyedVector.h" 27#include "tinyutils/smartpointer.h" 28 29namespace android { 30 31using namespace tinyutils; 32 33// ---------------------------------------------------------------------------- 34 35class AssemblyKeyBase { 36public: 37 virtual ~AssemblyKeyBase() { } 38 virtual int compare_type(const AssemblyKeyBase& key) const = 0; 39}; 40 41template <typename T> 42class AssemblyKey : public AssemblyKeyBase 43{ 44public: 45 AssemblyKey(const T& rhs) : mKey(rhs) { } 46 virtual int compare_type(const AssemblyKeyBase& key) const { 47 const T& rhs = static_cast<const AssemblyKey&>(key).mKey; 48 return android::compare_type(mKey, rhs); 49 } 50private: 51 T mKey; 52}; 53 54// ---------------------------------------------------------------------------- 55 56class Assembly 57{ 58public: 59 Assembly(size_t size); 60 virtual ~Assembly(); 61 62 ssize_t size() const; 63 uint32_t* base() const; 64 ssize_t resize(size_t size); 65 66 // protocol for sp<> 67 void incStrong(const void* id) const; 68 void decStrong(const void* id) const; 69 typedef void weakref_type; 70 71private: 72 mutable int32_t mCount; 73 uint32_t* mBase; 74 size_t mSize; 75}; 76 77// ---------------------------------------------------------------------------- 78 79class CodeCache 80{ 81public: 82// pretty simple cache API... 83 CodeCache(size_t size); 84 ~CodeCache(); 85 86 sp<Assembly> lookup(const AssemblyKeyBase& key) const; 87 88 int cache( const AssemblyKeyBase& key, 89 const sp<Assembly>& assembly); 90 91private: 92 // nothing to see here... 93 struct cache_entry_t { 94 inline cache_entry_t() { } 95 inline cache_entry_t(const sp<Assembly>& a, int64_t w) 96 : entry(a), when(w) { } 97 sp<Assembly> entry; 98 mutable int64_t when; 99 }; 100 101 class key_t { 102 friend int compare_type( 103 const key_value_pair_t<key_t, cache_entry_t>&, 104 const key_value_pair_t<key_t, cache_entry_t>&); 105 const AssemblyKeyBase* mKey; 106 public: 107 key_t() { }; 108 key_t(const AssemblyKeyBase& k) : mKey(&k) { } 109 }; 110 111 mutable pthread_mutex_t mLock; 112 mutable int64_t mWhen; 113 size_t mCacheSize; 114 size_t mCacheInUse; 115 KeyedVector<key_t, cache_entry_t> mCacheData; 116 117 friend int compare_type( 118 const key_value_pair_t<key_t, cache_entry_t>&, 119 const key_value_pair_t<key_t, cache_entry_t>&); 120}; 121 122// KeyedVector uses compare_type(), which is more efficient, than 123// just using operator < () 124inline int compare_type( 125 const key_value_pair_t<CodeCache::key_t, CodeCache::cache_entry_t>& lhs, 126 const key_value_pair_t<CodeCache::key_t, CodeCache::cache_entry_t>& rhs) 127{ 128 return lhs.key.mKey->compare_type(*(rhs.key.mKey)); 129} 130 131// ---------------------------------------------------------------------------- 132 133}; // namespace android 134 135#endif //ANDROID_CODECACHE_H 136