1 /* 2 * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org) 3 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved. 4 * Copyright (C) 2013 Google Inc. All rights reserved. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Library General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Library General Public License for more details. 15 * 16 * You should have received a copy of the GNU Library General Public License 17 * along with this library; see the file COPYING.LIB. If not, write to 18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301, USA. 20 * 21 */ 22 23 #ifndef MatchedPropertiesCache_h 24 #define MatchedPropertiesCache_h 25 26 #include "core/css/resolver/MatchResult.h" 27 28 #include "core/platform/Timer.h" 29 #include "wtf/Forward.h" 30 #include "wtf/HashMap.h" 31 #include "wtf/Noncopyable.h" 32 33 namespace WebCore { 34 35 class RenderStyle; 36 class StyleResolverState; 37 38 struct CachedMatchedProperties { 39 Vector<MatchedProperties> matchedProperties; 40 MatchRanges ranges; 41 RefPtr<RenderStyle> renderStyle; 42 RefPtr<RenderStyle> parentRenderStyle; 43 }; 44 45 class MatchedPropertiesCache { 46 WTF_MAKE_NONCOPYABLE(MatchedPropertiesCache); 47 public: 48 MatchedPropertiesCache(); 49 50 const CachedMatchedProperties* find(unsigned hash, const StyleResolverState&, const MatchResult&); 51 void add(const RenderStyle*, const RenderStyle* parentStyle, unsigned hash, const MatchResult&); 52 53 void clear(); 54 55 static bool isCacheable(const Element*, const RenderStyle*, const RenderStyle* parentStyle); 56 57 private: 58 // Every N additions to the matched declaration cache trigger a sweep where entries holding 59 // the last reference to a style declaration are garbage collected. 60 void sweep(Timer<MatchedPropertiesCache>*); 61 62 unsigned m_additionsSinceLastSweep; 63 64 typedef HashMap<unsigned, CachedMatchedProperties> Cache; 65 Cache m_cache; 66 67 Timer<MatchedPropertiesCache> m_sweepTimer; 68 }; 69 70 } 71 72 #endif 73
