2 * Copyright (C) 2012 Apple Inc. All Rights Reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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28 #include "DocumentSharedObjectPool.h"
30 #include "Attribute.h"
31 #include "ElementAttributeData.h"
35 class ImmutableElementAttributeDataCacheKey {
37 ImmutableElementAttributeDataCacheKey(const Attribute* attributes, unsigned attributeCount)
38 : m_attributes(attributes)
39 , m_attributeCount(attributeCount)
42 bool operator!=(const ImmutableElementAttributeDataCacheKey& other) const
44 if (m_attributeCount != other.m_attributeCount)
46 return memcmp(m_attributes, other.m_attributes, sizeof(Attribute) * m_attributeCount);
51 return StringHasher::hashMemory(m_attributes, m_attributeCount * sizeof(Attribute));
55 const Attribute* m_attributes;
56 unsigned m_attributeCount;
59 class ImmutableElementAttributeDataCacheEntry {
61 ImmutableElementAttributeDataCacheEntry(const ImmutableElementAttributeDataCacheKey& k, PassRefPtr<ElementAttributeData> v)
66 ImmutableElementAttributeDataCacheKey key;
67 RefPtr<ElementAttributeData> value;
70 PassRefPtr<ElementAttributeData> DocumentSharedObjectPool::cachedImmutableElementAttributeData(const Vector<Attribute>& attributes)
72 ASSERT(!attributes.isEmpty());
74 ImmutableElementAttributeDataCacheKey cacheKey(attributes.data(), attributes.size());
75 unsigned cacheHash = cacheKey.hash();
77 ImmutableElementAttributeDataCache::iterator cacheIterator = m_immutableElementAttributeDataCache.add(cacheHash, nullptr).iterator;
78 if (cacheIterator->value && cacheIterator->value->key != cacheKey)
81 RefPtr<ElementAttributeData> attributeData;
82 if (cacheHash && cacheIterator->value)
83 attributeData = cacheIterator->value->value;
85 attributeData = ElementAttributeData::createImmutable(attributes);
87 if (!cacheHash || cacheIterator->value)
88 return attributeData.release();
90 cacheIterator->value = adoptPtr(new ImmutableElementAttributeDataCacheEntry(ImmutableElementAttributeDataCacheKey(attributeData->immutableAttributeArray(), attributeData->length()), attributeData));
92 return attributeData.release();
95 DocumentSharedObjectPool::DocumentSharedObjectPool()
99 DocumentSharedObjectPool::~DocumentSharedObjectPool()