| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved. |
| * Copyright (C) 2013 Google Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #ifndef MatchedPropertiesCache_h |
| #define MatchedPropertiesCache_h |
| |
| #include "core/css/resolver/MatchResult.h" |
| |
| #include "core/platform/Timer.h" |
| #include "wtf/Forward.h" |
| #include "wtf/HashMap.h" |
| #include "wtf/Noncopyable.h" |
| |
| namespace WebCore { |
| |
| class RenderStyle; |
| class StyleResolverState; |
| |
| struct CachedMatchedProperties { |
| Vector<MatchedProperties> matchedProperties; |
| MatchRanges ranges; |
| RefPtr<RenderStyle> renderStyle; |
| RefPtr<RenderStyle> parentRenderStyle; |
| }; |
| |
| class MatchedPropertiesCache { |
| WTF_MAKE_NONCOPYABLE(MatchedPropertiesCache); |
| public: |
| MatchedPropertiesCache(); |
| |
| const CachedMatchedProperties* find(unsigned hash, const StyleResolverState&, const MatchResult&); |
| void add(const RenderStyle*, const RenderStyle* parentStyle, unsigned hash, const MatchResult&); |
| |
| void clear(); |
| |
| static bool isCacheable(const Element*, const RenderStyle*, const RenderStyle* parentStyle); |
| |
| private: |
| // Every N additions to the matched declaration cache trigger a sweep where entries holding |
| // the last reference to a style declaration are garbage collected. |
| void sweep(Timer<MatchedPropertiesCache>*); |
| |
| unsigned m_additionsSinceLastSweep; |
| |
| typedef HashMap<unsigned, CachedMatchedProperties> Cache; |
| Cache m_cache; |
| |
| Timer<MatchedPropertiesCache> m_sweepTimer; |
| }; |
| |
| } |
| |
| #endif |