| /* |
| * 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. |
| */ |
| |
| #include "config.h" |
| #include "bindings/core/v8/V8ValueCache.h" |
| |
| #include "bindings/core/v8/V8Binding.h" |
| #include "wtf/text/StringHash.h" |
| |
| namespace blink { |
| |
| StringCacheMapTraits::MapType* StringCacheMapTraits::MapFromWeakCallbackData( |
| const v8::WeakCallbackData<v8::String, WeakCallbackDataType>& data) |
| { |
| return &(V8PerIsolateData::from(data.GetIsolate())->stringCache()->m_stringCache); |
| } |
| |
| |
| void StringCacheMapTraits::Dispose( |
| v8::Isolate* isolate, v8::UniquePersistent<v8::String> value, StringImpl* key) |
| { |
| V8PerIsolateData::from(isolate)->stringCache()->InvalidateLastString(); |
| key->deref(); |
| } |
| |
| |
| StringCache::~StringCache() |
| { |
| // The MapType::Dispose callback calls StringCache::InvalidateLastString, |
| // which will only work while the destructor has not yet finished. Thus, |
| // we need to clear the map before the destructor has completed. |
| m_stringCache.Clear(); |
| } |
| |
| static v8::Local<v8::String> makeExternalString(const String& string, v8::Isolate* isolate) |
| { |
| if (string.is8Bit()) { |
| WebCoreStringResource8* stringResource = new WebCoreStringResource8(string); |
| v8::Local<v8::String> newString = v8::String::NewExternal(isolate, stringResource); |
| if (newString.IsEmpty()) |
| delete stringResource; |
| return newString; |
| } |
| |
| WebCoreStringResource16* stringResource = new WebCoreStringResource16(string); |
| v8::Local<v8::String> newString = v8::String::NewExternal(isolate, stringResource); |
| if (newString.IsEmpty()) |
| delete stringResource; |
| return newString; |
| } |
| |
| v8::Handle<v8::String> StringCache::v8ExternalStringSlow(v8::Isolate* isolate, StringImpl* stringImpl) |
| { |
| if (!stringImpl->length()) |
| return v8::String::Empty(isolate); |
| |
| StringCacheMapTraits::MapType::PersistentValueReference cachedV8String = m_stringCache.GetReference(stringImpl); |
| if (!cachedV8String.IsEmpty()) { |
| m_lastStringImpl = stringImpl; |
| m_lastV8String = cachedV8String; |
| return m_lastV8String.NewLocal(isolate); |
| } |
| |
| return createStringAndInsertIntoCache(isolate, stringImpl); |
| } |
| |
| void StringCache::setReturnValueFromStringSlow(v8::ReturnValue<v8::Value> returnValue, StringImpl* stringImpl) |
| { |
| if (!stringImpl->length()) { |
| returnValue.SetEmptyString(); |
| return; |
| } |
| |
| StringCacheMapTraits::MapType::PersistentValueReference cachedV8String = m_stringCache.GetReference(stringImpl); |
| if (!cachedV8String.IsEmpty()) { |
| m_lastStringImpl = stringImpl; |
| m_lastV8String = cachedV8String; |
| m_lastV8String.SetReturnValue(returnValue); |
| return; |
| } |
| |
| returnValue.Set(createStringAndInsertIntoCache(returnValue.GetIsolate(), stringImpl)); |
| } |
| |
| v8::Local<v8::String> StringCache::createStringAndInsertIntoCache(v8::Isolate* isolate, StringImpl* stringImpl) |
| { |
| ASSERT(!m_stringCache.Contains(stringImpl)); |
| ASSERT(stringImpl->length()); |
| |
| v8::Local<v8::String> newString = makeExternalString(String(stringImpl), isolate); |
| if (newString.IsEmpty()) |
| return newString; |
| |
| v8::UniquePersistent<v8::String> wrapper(isolate, newString); |
| |
| stringImpl->ref(); |
| wrapper.MarkIndependent(); |
| m_stringCache.Set(stringImpl, wrapper.Pass(), &m_lastV8String); |
| m_lastStringImpl = stringImpl; |
| |
| return newString; |
| } |
| |
| void StringCache::InvalidateLastString() |
| { |
| m_lastStringImpl = nullptr; |
| m_lastV8String.Reset(); |
| } |
| |
| } // namespace blink |