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 29 namespace android { 30 31 // ---------------------------------------------------------------------------- 32 33 class AssemblyKeyBase { 34 public: 35 virtual ~AssemblyKeyBase() { } 36 virtual int compare_type(const AssemblyKeyBase& key) const = 0; 37 }; 38 39 template <typename T> 40 class AssemblyKey : public AssemblyKeyBase 41 { 42 public: 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 } 48 private: 49 T mKey; 50 }; 51 52 // ---------------------------------------------------------------------------- 53 54 class Assembly 55 { 56 public: 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 69 private: 70 mutable int32_t mCount; 71 uint32_t* mBase; 72 ssize_t mSize; 73 }; 74 75 // ---------------------------------------------------------------------------- 76 77 class CodeCache 78 { 79 public: 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 89 private: 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 < () 122 inline 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
