| /* |
| * Copyright (C) 2009 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef V8ValueCache_h |
| #define V8ValueCache_h |
| |
| #include "bindings/core/v8/V8PersistentValueMap.h" |
| #include "wtf/HashMap.h" |
| #include "wtf/RefPtr.h" |
| #include "wtf/text/AtomicString.h" |
| #include "wtf/text/WTFString.h" |
| #include <v8.h> |
| |
| namespace blink { |
| |
| class StringCacheMapTraits : public V8PersistentValueMapTraits<StringImpl*, v8::String, true> { |
| public: |
| // Weak traits: |
| typedef StringImpl WeakCallbackDataType; |
| typedef v8::PersistentValueMap<StringImpl*, v8::String, StringCacheMapTraits> MapType; |
| |
| static WeakCallbackDataType* WeakCallbackParameter( |
| MapType* map, StringImpl* key, v8::Local<v8::String>& value) { return key; } |
| static void DisposeCallbackData(WeakCallbackDataType* callbackData) { } |
| |
| static MapType* MapFromWeakCallbackData( |
| const v8::WeakCallbackData<v8::String, WeakCallbackDataType>&); |
| |
| static StringImpl* KeyFromWeakCallbackData( |
| const v8::WeakCallbackData<v8::String, WeakCallbackDataType>& data) |
| { |
| return data.GetParameter(); |
| } |
| |
| static void Dispose(v8::Isolate*, v8::UniquePersistent<v8::String> value, StringImpl* key); |
| }; |
| |
| |
| class StringCache { |
| public: |
| StringCache(v8::Isolate* isolate) : m_stringCache(isolate) { } |
| ~StringCache(); |
| |
| v8::Handle<v8::String> v8ExternalString(StringImpl* stringImpl, v8::Isolate* isolate) |
| { |
| ASSERT(stringImpl); |
| if (m_lastStringImpl.get() == stringImpl) |
| return m_lastV8String.NewLocal(isolate); |
| return v8ExternalStringSlow(isolate, stringImpl); |
| } |
| |
| void setReturnValueFromString(v8::ReturnValue<v8::Value> returnValue, StringImpl* stringImpl) |
| { |
| ASSERT(stringImpl); |
| if (m_lastStringImpl.get() == stringImpl) |
| m_lastV8String.SetReturnValue(returnValue); |
| else |
| setReturnValueFromStringSlow(returnValue, stringImpl); |
| } |
| |
| friend class StringCacheMapTraits; |
| |
| private: |
| v8::Handle<v8::String> v8ExternalStringSlow(v8::Isolate*, StringImpl*); |
| void setReturnValueFromStringSlow(v8::ReturnValue<v8::Value>, StringImpl*); |
| v8::Local<v8::String> createStringAndInsertIntoCache(v8::Isolate*, StringImpl*); |
| void InvalidateLastString(); |
| |
| StringCacheMapTraits::MapType m_stringCache; |
| StringCacheMapTraits::MapType::PersistentValueReference m_lastV8String; |
| |
| // Note: RefPtr is a must as we cache by StringImpl* equality, not identity |
| // hence lastStringImpl might be not a key of the cache (in sense of identity) |
| // and hence it's not refed on addition. |
| RefPtr<StringImpl> m_lastStringImpl; |
| }; |
| |
| } // namespace blink |
| |
| #endif // V8ValueCache_h |