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| 1 // Copyright 2012, Google Inc. | |
| 2 // All rights reserved. | |
| 3 // | |
| 4 // Redistribution and use in source and binary forms, with or without | |
| 5 // modification, are permitted provided that the following conditions are | |
| 6 // met: | |
| 7 // | |
| 8 // * Redistributions of source code must retain the above copyright | |
| 9 // notice, this list of conditions and the following disclaimer. | |
| 10 // * Redistributions in binary form must reproduce the above | |
| 11 // copyright notice, this list of conditions and the following disclaimer | |
| 12 // in the documentation and/or other materials provided with the | |
| 13 // distribution. | |
| 14 // * Neither the name of Google Inc. nor the names of its | |
| 15 // contributors may be used to endorse or promote products derived from | |
| 16 // this software without specific prior written permission. | |
| 17 // | |
| 18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 29 | |
| 30 #ifndef DartStringCache_h | |
| 31 #define DartStringCache_h | |
| 32 | |
| 33 #include "wtf/HashMap.h" | |
| 34 #include "wtf/RefPtr.h" | |
| 35 #include "wtf/text/StringHash.h" | |
| 36 #include "wtf/text/StringImpl.h" | |
| 37 | |
| 38 #include <dart_api.h> | |
| 39 | |
| 40 namespace blink { | |
| 41 | |
| 42 class DartStringCache { | |
| 43 public: | |
| 44 DartStringCache(); | |
| 45 | |
| 46 Dart_WeakPersistentHandle get(StringImpl* stringImpl, bool autoDartScope = t
rue) | |
| 47 { | |
| 48 ASSERT(stringImpl); | |
| 49 | |
| 50 if (m_lastStringImpl.get() == stringImpl) | |
| 51 return m_lastDartString; | |
| 52 | |
| 53 return getSlow(stringImpl, autoDartScope); | |
| 54 } | |
| 55 | |
| 56 void clearWeakHandles(); | |
| 57 | |
| 58 // FIXME: implement clearing on GC. | |
| 59 | |
| 60 private: | |
| 61 Dart_WeakPersistentHandle getSlow(StringImpl*, bool autoDartScope); | |
| 62 static void handleFinalizer(void*, Dart_WeakPersistentHandle, void* peer); | |
| 63 | |
| 64 typedef HashMap<StringImpl*, Dart_WeakPersistentHandle> StringCache; | |
| 65 StringCache m_stringCache; | |
| 66 Dart_WeakPersistentHandle m_lastDartString; | |
| 67 // Note: RefPtr is a must as we cache by StringImpl* equality, not identity | |
| 68 // hence lastStringImpl might be not a key of the cache (in sense of identit
y) | |
| 69 // and hence it's not refed on addition. | |
| 70 RefPtr<StringImpl> m_lastStringImpl; | |
| 71 }; | |
| 72 | |
| 73 } | |
| 74 | |
| 75 #endif | |
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