Ben Murdoch | e69819b | 2013-07-17 14:56:49 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 1999 Lars Knoll (knoll@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 { |
Ben Murdoch | e69819b | 2013-07-17 14:56:49 +0100 | [diff] [blame] | 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 |