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/*
* Copyright (C) 2010 Google, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "core/html/parser/HTMLParserScheduler.h"
#include "core/dom/Document.h"
#include "core/html/parser/HTMLDocumentParser.h"
#include "core/frame/FrameView.h"
namespace WebCore {
// parserChunkSize is used to define how many tokens the parser will
// process before checking against parserTimeLimit and possibly yielding.
// This is a performance optimization to prevent checking after every token.
const int HTMLParserScheduler::parserChunkSize = 4096;
// parserTimeLimit is the seconds the parser will run in one write() call
// before yielding. Inline <script> execution can cause it to exceed the limit.
const double HTMLParserScheduler::parserTimeLimit = 0.2;
ActiveParserSession::ActiveParserSession(Document* document)
: m_document(document)
{
if (!m_document)
return;
m_document->incrementActiveParserCount();
}
ActiveParserSession::~ActiveParserSession()
{
if (!m_document)
return;
m_document->decrementActiveParserCount();
}
PumpSession::PumpSession(unsigned& nestingLevel, Document* document)
: NestingLevelIncrementer(nestingLevel)
, ActiveParserSession(document)
// Setting processedTokens to INT_MAX causes us to check for yields
// after any token during any parse where yielding is allowed.
// At that time we'll initialize startTime.
, processedTokens(INT_MAX)
, startTime(0)
, needsYield(false)
, didSeeScript(false)
{
}
PumpSession::~PumpSession()
{
}
HTMLParserScheduler::HTMLParserScheduler(HTMLDocumentParser* parser)
: m_parser(parser)
, m_continueNextChunkTimer(this, &HTMLParserScheduler::continueNextChunkTimerFired)
, m_isSuspendedWithActiveTimer(false)
{
}
HTMLParserScheduler::~HTMLParserScheduler()
{
m_continueNextChunkTimer.stop();
}
void HTMLParserScheduler::continueNextChunkTimerFired(Timer<HTMLParserScheduler>* timer)
{
ASSERT_UNUSED(timer, timer == &m_continueNextChunkTimer);
m_parser->resumeParsingAfterYield();
}
void HTMLParserScheduler::scheduleForResume()
{
m_continueNextChunkTimer.startOneShot(0, FROM_HERE);
}
void HTMLParserScheduler::suspend()
{
ASSERT(!m_isSuspendedWithActiveTimer);
if (!m_continueNextChunkTimer.isActive())
return;
m_isSuspendedWithActiveTimer = true;
m_continueNextChunkTimer.stop();
}
void HTMLParserScheduler::resume()
{
ASSERT(!m_continueNextChunkTimer.isActive());
if (!m_isSuspendedWithActiveTimer)
return;
m_isSuspendedWithActiveTimer = false;
m_continueNextChunkTimer.startOneShot(0, FROM_HERE);
}
}
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