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 31// ---------------------------------------------------------------------------- 32 33class AssemblyKeyBase { 34public: 35 virtual ~AssemblyKeyBase() { } 36 virtual int compare_type(const AssemblyKeyBase& key) const = 0; 37}; 38 39template <typename T> 40class AssemblyKey : public AssemblyKeyBase 41{ 42public: 43 AssemblyKey(const T& rhs) : mKey(rhs) { } 44 virtual int compare_type(const AssemblyKeyBase& key) const { 45 const T& rhs = static_cast<const AssemblyKey&>(key).mKey; 46 return android::compare_type(mKey, rhs); 47 } 48private: 49 T mKey; 50}; 51 52// ---------------------------------------------------------------------------- 53 54class Assembly 55{ 56public: 57 Assembly(size_t size); 58 virtual ~Assembly(); 59 60 ssize_t size() const; 61 uint32_t* base() const; 62 ssize_t resize(size_t size); 63 64 // protocol for sp<> 65 void incStrong(const void* id) const; 66 void decStrong(const void* id) const; 67 typedef void weakref_type; 68 69private: 70 mutable int32_t mCount; 71 uint32_t* mBase; 72 size_t mSize; 73}; 74 75// ---------------------------------------------------------------------------- 76 77class CodeCache 78{ 79public: 80// pretty simple cache API... 81 CodeCache(size_t size); 82 ~CodeCache(); 83 84 sp<Assembly> lookup(const AssemblyKeyBase& key) const; 85 86 int cache( const AssemblyKeyBase& key, 87 const sp<Assembly>& assembly); 88 89private: 90 // nothing to see here... 91 struct cache_entry_t { 92 inline cache_entry_t() { } 93 inline cache_entry_t(const sp<Assembly>& a, int64_t w) 94 : entry(a), when(w) { } 95 sp<Assembly> entry; 96 mutable int64_t when; 97 }; 98 99 class key_t { 100 friend int compare_type( 101 const key_value_pair_t<key_t, cache_entry_t>&, 102 const key_value_pair_t<key_t, cache_entry_t>&); 103 const AssemblyKeyBase* mKey; 104 public: 105 key_t() { }; 106 key_t(const AssemblyKeyBase& k) : mKey(&k) { } 107 }; 108 109 mutable pthread_mutex_t mLock; 110 mutable int64_t mWhen; 111 size_t mCacheSize; 112 size_t mCacheInUse; 113 KeyedVector<key_t, cache_entry_t> mCacheData; 114 115 friend int compare_type( 116 const key_value_pair_t<key_t, cache_entry_t>&, 117 const key_value_pair_t<key_t, cache_entry_t>&); 118}; 119 120// KeyedVector uses compare_type(), which is more efficient, than 121// just using operator < () 122inline int compare_type( 123 const key_value_pair_t<CodeCache::key_t, CodeCache::cache_entry_t>& lhs, 124 const key_value_pair_t<CodeCache::key_t, CodeCache::cache_entry_t>& rhs) 125{ 126 return lhs.key.mKey->compare_type(*(rhs.key.mKey)); 127} 128 129// ---------------------------------------------------------------------------- 130 131}; // namespace android 132 133#endif //ANDROID_CODECACHE_H 134