CodeCache.h revision dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0
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 <utils/KeyedVector.h> 27 28#include "tinyutils/smartpointer.h" 29 30namespace android { 31 32// ---------------------------------------------------------------------------- 33 34class AssemblyKeyBase { 35public: 36 virtual ~AssemblyKeyBase() { } 37 virtual int compare_type(const AssemblyKeyBase& key) const = 0; 38}; 39 40template <typename T> 41class AssemblyKey : public AssemblyKeyBase 42{ 43public: 44 AssemblyKey(const T& rhs) : mKey(rhs) { } 45 virtual int compare_type(const AssemblyKeyBase& key) const { 46 const T& rhs = static_cast<const AssemblyKey&>(key).mKey; 47 return android::compare_type(mKey, rhs); 48 } 49private: 50 T mKey; 51}; 52 53// ---------------------------------------------------------------------------- 54 55class Assembly 56{ 57public: 58 Assembly(size_t size); 59 virtual ~Assembly(); 60 61 ssize_t size() const; 62 uint32_t* base() const; 63 ssize_t resize(size_t size); 64 65 // protocol for sp<> 66 void incStrong(const void* id) const; 67 void decStrong(const void* id) const; 68 typedef void weakref_type; 69 70private: 71 mutable int32_t mCount; 72 uint32_t* mBase; 73 ssize_t mSize; 74}; 75 76// ---------------------------------------------------------------------------- 77 78class CodeCache 79{ 80public: 81// pretty simple cache API... 82 CodeCache(size_t size); 83 ~CodeCache(); 84 85 sp<Assembly> lookup(const AssemblyKeyBase& key) const; 86 87 int cache( const AssemblyKeyBase& key, 88 const sp<Assembly>& assembly); 89 90private: 91 // nothing to see here... 92 struct cache_entry_t { 93 inline cache_entry_t() { } 94 inline cache_entry_t(const sp<Assembly>& a, int64_t w) 95 : entry(a), when(w) { } 96 sp<Assembly> entry; 97 mutable int64_t when; 98 }; 99 100 class key_t { 101 friend int compare_type( 102 const key_value_pair_t<key_t, cache_entry_t>&, 103 const key_value_pair_t<key_t, cache_entry_t>&); 104 const AssemblyKeyBase* mKey; 105 public: 106 key_t() { }; 107 key_t(const AssemblyKeyBase& k) : mKey(&k) { } 108 }; 109 110 mutable pthread_mutex_t mLock; 111 mutable int64_t mWhen; 112 size_t mCacheSize; 113 size_t mCacheInUse; 114 KeyedVector<key_t, cache_entry_t> mCacheData; 115 116 friend int compare_type( 117 const key_value_pair_t<key_t, cache_entry_t>&, 118 const key_value_pair_t<key_t, cache_entry_t>&); 119}; 120 121// KeyedVector uses compare_type(), which is more efficient, than 122// just using operator < () 123inline int compare_type( 124 const key_value_pair_t<CodeCache::key_t, CodeCache::cache_entry_t>& lhs, 125 const key_value_pair_t<CodeCache::key_t, CodeCache::cache_entry_t>& rhs) 126{ 127 return lhs.key.mKey->compare_type(*(rhs.key.mKey)); 128} 129 130// ---------------------------------------------------------------------------- 131 132}; // namespace android 133 134#endif //ANDROID_CODECACHE_H 135