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 #include <cutils/mspace.h> 26 27 #include "tinyutils/KeyedVector.h" 28 #include "tinyutils/smartpointer.h" 29 30 namespace android { 31 32 // ---------------------------------------------------------------------------- 33 34 class AssemblyKeyBase { 35 public: 36 virtual ~AssemblyKeyBase() { } 37 virtual int compare_type(const AssemblyKeyBase& key) const = 0; 38 }; 39 40 template <typename T> 41 class AssemblyKey : public AssemblyKeyBase 42 { 43 public: 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 } 49 private: 50 T mKey; 51 }; 52 53 // ---------------------------------------------------------------------------- 54 55 class Assembly 56 { 57 public: 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 70 private: 71 static mspace getMspace(); 72 void ensureMbaseExecutable(); 73 74 mutable int32_t mCount; 75 uint32_t* mBase; 76 size_t mSize; 77 }; 78 79 // ---------------------------------------------------------------------------- 80 81 class CodeCache 82 { 83 public: 84 // pretty simple cache API... 85 CodeCache(size_t size); 86 ~CodeCache(); 87 88 sp<Assembly> lookup(const AssemblyKeyBase& key) const; 89 90 int cache( const AssemblyKeyBase& key, 91 const sp<Assembly>& assembly); 92 93 private: 94 // nothing to see here... 95 struct cache_entry_t { 96 inline cache_entry_t() { } 97 inline cache_entry_t(const sp<Assembly>& a, int64_t w) 98 : entry(a), when(w) { } 99 sp<Assembly> entry; 100 mutable int64_t when; 101 }; 102 103 class key_t { 104 friend int compare_type( 105 const key_value_pair_t<key_t, cache_entry_t>&, 106 const key_value_pair_t<key_t, cache_entry_t>&); 107 const AssemblyKeyBase* mKey; 108 public: 109 key_t() { }; 110 key_t(const AssemblyKeyBase& k) : mKey(&k) { } 111 }; 112 113 mutable pthread_mutex_t mLock; 114 mutable int64_t mWhen; 115 size_t mCacheSize; 116 size_t mCacheInUse; 117 KeyedVector<key_t, cache_entry_t> mCacheData; 118 119 friend int compare_type( 120 const key_value_pair_t<key_t, cache_entry_t>&, 121 const key_value_pair_t<key_t, cache_entry_t>&); 122 }; 123 124 // KeyedVector uses compare_type(), which is more efficient, than 125 // just using operator < () 126 inline int compare_type( 127 const key_value_pair_t<CodeCache::key_t, CodeCache::cache_entry_t>& lhs, 128 const key_value_pair_t<CodeCache::key_t, CodeCache::cache_entry_t>& rhs) 129 { 130 return lhs.key.mKey->compare_type(*(rhs.key.mKey)); 131 } 132 133 // ---------------------------------------------------------------------------- 134 135 }; // namespace android 136 137 #endif //ANDROID_CODECACHE_H 138
