63 lines
2.5 KiB
C++
63 lines
2.5 KiB
C++
/*
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* Copyright (C) 2012, 2013 Apple Inc. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "config.h"
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#include "DocumentSharedObjectPool.h"
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#include "Element.h"
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namespace WebCore {
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inline unsigned attributeHash(const Vector<Attribute>& attributes)
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{
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return StringHasher::hashMemory(attributes.data(), attributes.size() * sizeof(Attribute));
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}
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inline bool hasSameAttributes(const Vector<Attribute>& attributes, ShareableElementData& elementData)
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{
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if (attributes.size() != elementData.length())
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return false;
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return !memcmp(attributes.data(), elementData.m_attributeArray, attributes.size() * sizeof(Attribute));
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}
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Ref<ShareableElementData> DocumentSharedObjectPool::cachedShareableElementDataWithAttributes(const Vector<Attribute>& attributes)
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{
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ASSERT(!attributes.isEmpty());
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auto& cachedData = m_shareableElementDataCache.add(attributeHash(attributes), nullptr).iterator->value;
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// FIXME: This prevents sharing when there's a hash collision.
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if (cachedData && !hasSameAttributes(attributes, *cachedData))
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return ShareableElementData::createWithAttributes(attributes);
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if (!cachedData)
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cachedData = ShareableElementData::createWithAttributes(attributes);
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return *cachedData;
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}
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}
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