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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
* Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
* Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
* Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
* Copyright (C) Research In Motion Limited 2011. 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.
*/
#include "config.h"
#include "core/css/resolver/MatchedPropertiesCache.h"
#include "core/css/StylePropertySet.h"
#include "core/css/resolver/StyleResolverState.h"
#include "core/rendering/style/RenderStyle.h"
namespace WebCore {
void CachedMatchedProperties::set(const RenderStyle* style, const RenderStyle* parentStyle, const MatchResult& matchResult)
{
matchedProperties.appendVector(matchResult.matchedProperties);
ranges = matchResult.ranges;
// Note that we don't cache the original RenderStyle instance. It may be further modified.
// The RenderStyle in the cache is really just a holder for the substructures and never used as-is.
this->renderStyle = RenderStyle::clone(style);
this->parentRenderStyle = RenderStyle::clone(parentStyle);
}
void CachedMatchedProperties::clear()
{
matchedProperties.clear();
renderStyle = nullptr;
parentRenderStyle = nullptr;
}
MatchedPropertiesCache::MatchedPropertiesCache()
: m_additionsSinceLastSweep(0)
, m_sweepTimer(this, &MatchedPropertiesCache::sweep)
{
}
const CachedMatchedProperties* MatchedPropertiesCache::find(unsigned hash, const StyleResolverState& styleResolverState, const MatchResult& matchResult)
{
ASSERT(hash);
Cache::iterator it = m_cache.find(hash);
if (it == m_cache.end())
return 0;
CachedMatchedProperties* cacheItem = it->value.get();
ASSERT(cacheItem);
size_t size = matchResult.matchedProperties.size();
if (size != cacheItem->matchedProperties.size())
return 0;
if (cacheItem->renderStyle->insideLink() != styleResolverState.style()->insideLink())
return 0;
for (size_t i = 0; i < size; ++i) {
if (matchResult.matchedProperties[i] != cacheItem->matchedProperties[i])
return 0;
}
if (cacheItem->ranges != matchResult.ranges)
return 0;
return cacheItem;
}
void MatchedPropertiesCache::add(const RenderStyle* style, const RenderStyle* parentStyle, unsigned hash, const MatchResult& matchResult)
{
static const unsigned maxAdditionsBetweenSweeps = 100;
if (++m_additionsSinceLastSweep >= maxAdditionsBetweenSweeps
&& !m_sweepTimer.isActive()) {
static const unsigned sweepTimeInSeconds = 60;
m_sweepTimer.startOneShot(sweepTimeInSeconds, FROM_HERE);
}
ASSERT(hash);
Cache::AddResult addResult = m_cache.add(hash, nullptr);
if (addResult.isNewEntry)
addResult.storedValue->value = adoptPtr(new CachedMatchedProperties);
CachedMatchedProperties* cacheItem = addResult.storedValue->value.get();
if (!addResult.isNewEntry)
cacheItem->clear();
cacheItem->set(style, parentStyle, matchResult);
}
void MatchedPropertiesCache::clear()
{
m_cache.clear();
}
void MatchedPropertiesCache::clearViewportDependent()
{
Vector<unsigned, 16> toRemove;
for (Cache::iterator it = m_cache.begin(); it != m_cache.end(); ++it) {
CachedMatchedProperties* cacheItem = it->value.get();
if (cacheItem->renderStyle->hasViewportUnits())
toRemove.append(it->key);
}
m_cache.removeAll(toRemove);
}
void MatchedPropertiesCache::sweep(Timer<MatchedPropertiesCache>*)
{
// Look for cache entries containing a style declaration with a single ref and remove them.
// This may happen when an element attribute mutation causes it to generate a new inlineStyle()
// or presentationAttributeStyle(), potentially leaving this cache with the last ref on the old one.
Vector<unsigned, 16> toRemove;
Cache::iterator it = m_cache.begin();
Cache::iterator end = m_cache.end();
for (; it != end; ++it) {
CachedMatchedProperties* cacheItem = it->value.get();
Vector<MatchedProperties>& matchedProperties = cacheItem->matchedProperties;
for (size_t i = 0; i < matchedProperties.size(); ++i) {
if (matchedProperties[i].properties->hasOneRef()) {
toRemove.append(it->key);
break;
}
}
}
m_cache.removeAll(toRemove);
m_additionsSinceLastSweep = 0;
}
bool MatchedPropertiesCache::isCacheable(const Element* element, const RenderStyle* style, const RenderStyle* parentStyle)
{
// FIXME: CSSPropertyWebkitWritingMode modifies state when applying to document element. We can't skip the applying by caching.
if (element == element->document().documentElement() && element->document().writingModeSetOnDocumentElement())
return false;
if (style->unique() || (style->styleType() != NOPSEUDO && parentStyle->unique()))
return false;
if (style->hasAppearance())
return false;
if (style->zoom() != RenderStyle::initialZoom())
return false;
if (style->writingMode() != RenderStyle::initialWritingMode())
return false;
if (style->hasCurrentColor())
return false;
// CSSPropertyInternalCallback sets the rule's selector name into the RenderStyle, and that's not recalculated if the RenderStyle is loaded from the cache, so don't cache it.
if (!style->callbackSelectors().isEmpty())
return false;
// The cache assumes static knowledge about which properties are inherited.
if (parentStyle->hasExplicitlyInheritedProperties())
return false;
return true;
}
}
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