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28 #include "DocumentSharedObjectPool.h"
34 class ShareableElementDataCacheKey {
36 ShareableElementDataCacheKey(const Attribute* attributes, unsigned attributeCount)
37 : m_attributes(attributes)
38 , m_attributeCount(attributeCount)
41 bool operator!=(const ShareableElementDataCacheKey& 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 ShareableElementDataCacheEntry {
60 ShareableElementDataCacheEntry(const ShareableElementDataCacheKey& k, PassRefPtr<ShareableElementData> v)
65 ShareableElementDataCacheKey key;
66 RefPtr<ShareableElementData> value;
69 PassRefPtr<ShareableElementData> DocumentSharedObjectPool::cachedShareableElementDataWithAttributes(const Vector<Attribute>& attributes)
71 ASSERT(!attributes.isEmpty());
73 ShareableElementDataCacheKey cacheKey(attributes.data(), attributes.size());
74 unsigned cacheHash = cacheKey.hash();
76 ShareableElementDataCache::iterator cacheIterator = m_shareableElementDataCache.add(cacheHash, nullptr).iterator;
77 if (cacheIterator->value && cacheIterator->value->key != cacheKey)
80 RefPtr<ShareableElementData> elementData;
81 if (cacheHash && cacheIterator->value)
82 elementData = cacheIterator->value->value;
84 elementData = ShareableElementData::createWithAttributes(attributes);
86 if (!cacheHash || cacheIterator->value)
87 return elementData.release();
89 cacheIterator->value = adoptPtr(new ShareableElementDataCacheEntry(ShareableElementDataCacheKey(elementData->immutableAttributeArray(), elementData->length()), elementData));
91 return elementData.release();
94 DocumentSharedObjectPool::DocumentSharedObjectPool()
98 DocumentSharedObjectPool::~DocumentSharedObjectPool()