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 #include "tinyutils/smartpointer.h" 28 29 namespace android { 30 31 using namespace tinyutils; 32 33 // ---------------------------------------------------------------------------- 34 35 class AssemblyKeyBase { 36 public: 37 virtual ~AssemblyKeyBase() { } 38 virtual int compare_type(const AssemblyKeyBase& key) const = 0; 39 }; 40 41 template <typename T> 42 class AssemblyKey : public AssemblyKeyBase 43 { 44 public: 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 } 50 private: 51 T mKey; 52 }; 53 54 // ---------------------------------------------------------------------------- 55 56 class Assembly 57 { 58 public: 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 71 private: 72 mutable int32_t mCount; 73 uint32_t* mBase; 74 size_t mSize; 75 }; 76 77 // ---------------------------------------------------------------------------- 78 79 class CodeCache 80 { 81 public: 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 91 private: 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 < () 124 inline 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
