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/*
* 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/StylePropertySet.h"
#include "core/css/resolver/MatchResult.h"
#include "platform/Timer.h"
#include "platform/heap/Handle.h"
#include "wtf/Forward.h"
#include "wtf/HashMap.h"
#include "wtf/Noncopyable.h"
namespace blink {
class RenderStyle;
class StyleResolverState;
class CachedMatchedProperties final : public NoBaseWillBeGarbageCollectedFinalized<CachedMatchedProperties> {
public:
WillBeHeapVector<MatchedProperties> matchedProperties;
MatchRanges ranges;
RefPtr<RenderStyle> renderStyle;
RefPtr<RenderStyle> parentRenderStyle;
void set(const RenderStyle*, const RenderStyle* parentStyle, const MatchResult&);
void clear();
void trace(Visitor* visitor) { visitor->trace(matchedProperties); }
};
// Specialize the HashTraits for CachedMatchedProperties to check for dead
// entries in the MatchedPropertiesCache.
#if ENABLE(OILPAN)
struct CachedMatchedPropertiesHashTraits : HashTraits<Member<CachedMatchedProperties> > {
static const WTF::WeakHandlingFlag weakHandlingFlag = WTF::WeakHandlingInCollections;
static bool traceInCollection(Visitor*, Member<CachedMatchedProperties>&, WTF::ShouldWeakPointersBeMarkedStrongly);
};
#endif
class MatchedPropertiesCache {
DISALLOW_ALLOCATION();
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();
void clearViewportDependent();
static bool isCacheable(const Element*, const RenderStyle*, const RenderStyle* parentStyle);
void trace(Visitor*);
private:
#if ENABLE(OILPAN)
typedef HeapHashMap<unsigned, Member<CachedMatchedProperties>, DefaultHash<unsigned>::Hash, HashTraits<unsigned>, CachedMatchedPropertiesHashTraits > Cache;
#else
// 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, OwnPtr<CachedMatchedProperties> > Cache;
Timer<MatchedPropertiesCache> m_sweepTimer;
#endif
Cache m_cache;
};
}
#endif
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