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
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.
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #include "DocumentSharedObjectPool.h"
34 class ImmutableElementAttributeDataCacheKey {
36 ImmutableElementAttributeDataCacheKey(const Attribute* attributes, unsigned attributeCount)
37 : m_attributes(attributes)
38 , m_attributeCount(attributeCount)
41 bool operator!=(const ImmutableElementAttributeDataCacheKey& other) const
43 if (m_attributeCount != other.m_attributeCount)
45 return memcmp(m_attributes, other.m_attributes, sizeof(Attribute) * m_attributeCount);
50 return StringHasher::hashMemory(m_attributes, m_attributeCount * sizeof(Attribute));
54 const Attribute* m_attributes;
55 unsigned m_attributeCount;
58 class ImmutableElementAttributeDataCacheEntry {
60 ImmutableElementAttributeDataCacheEntry(const ImmutableElementAttributeDataCacheKey& k, PassRefPtr<ElementAttributeData> v)
65 ImmutableElementAttributeDataCacheKey key;
66 RefPtr<ElementAttributeData> value;
69 PassRefPtr<ElementAttributeData> DocumentSharedObjectPool::cachedImmutableElementAttributeData(const Vector<Attribute>& attributes)
71 ASSERT(!attributes.isEmpty());
73 ImmutableElementAttributeDataCacheKey cacheKey(attributes.data(), attributes.size());
74 unsigned cacheHash = cacheKey.hash();
76 ImmutableElementAttributeDataCache::iterator cacheIterator = m_immutableElementAttributeDataCache.add(cacheHash, nullptr).iterator;
77 if (cacheIterator->value && cacheIterator->value->key != cacheKey)
80 RefPtr<ElementAttributeData> attributeData;
81 if (cacheHash && cacheIterator->value)
82 attributeData = cacheIterator->value->value;
84 attributeData = ElementAttributeData::createImmutable(attributes);
86 if (!cacheHash || cacheIterator->value)
87 return attributeData.release();
89 cacheIterator->value = adoptPtr(new ImmutableElementAttributeDataCacheEntry(ImmutableElementAttributeDataCacheKey(attributeData->immutableAttributeArray(), attributeData->length()), attributeData));
91 return attributeData.release();
94 DocumentSharedObjectPool::DocumentSharedObjectPool()
98 DocumentSharedObjectPool::~DocumentSharedObjectPool()