1 /* 2 * Copyright (C) 2009 Google Inc. 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 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef V8ValueCache_h 27 #define V8ValueCache_h 28 29 #include "bindings/v8/UnsafePersistent.h" 30 #include <v8.h> 31 #include "wtf/HashMap.h" 32 #include "wtf/RefPtr.h" 33 #include "wtf/text/AtomicString.h" 34 #include "wtf/text/WTFString.h" 35 36 namespace WebCore { 37 38 class StringCache { 39 public: StringCache()40 StringCache() { } 41 v8ExternalString(StringImpl * stringImpl,v8::Isolate * isolate)42 v8::Handle<v8::String> v8ExternalString(StringImpl* stringImpl, v8::Isolate* isolate) 43 { 44 ASSERT(stringImpl); 45 if (m_lastStringImpl.get() == stringImpl) 46 return m_lastV8String.newLocal(isolate); 47 return v8ExternalStringSlow(stringImpl, isolate); 48 } 49 setReturnValueFromString(v8::ReturnValue<v8::Value> returnValue,StringImpl * stringImpl)50 void setReturnValueFromString(v8::ReturnValue<v8::Value> returnValue, StringImpl* stringImpl) 51 { 52 ASSERT(stringImpl); 53 if (m_lastStringImpl.get() == stringImpl) 54 returnValue.Set(*m_lastV8String.persistent()); 55 else 56 setReturnValueFromStringSlow(returnValue, stringImpl); 57 } 58 59 private: 60 static void setWeakCallback(const v8::WeakCallbackData<v8::String, StringImpl>&); 61 62 v8::Handle<v8::String> v8ExternalStringSlow(StringImpl*, v8::Isolate*); 63 void setReturnValueFromStringSlow(v8::ReturnValue<v8::Value>, StringImpl*); 64 v8::Local<v8::String> createStringAndInsertIntoCache(StringImpl*, v8::Isolate*); 65 66 HashMap<StringImpl*, UnsafePersistent<v8::String> > m_stringCache; 67 UnsafePersistent<v8::String> m_lastV8String; 68 // Note: RefPtr is a must as we cache by StringImpl* equality, not identity 69 // hence lastStringImpl might be not a key of the cache (in sense of identity) 70 // and hence it's not refed on addition. 71 RefPtr<StringImpl> m_lastStringImpl; 72 }; 73 74 } // namespace WebCore 75 76 #endif // V8ValueCache_h 77