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295f920116
I wrote a script to do this which is attached to the bug. TBR=abarth@chromium.org BUG=435361 Review URL: https://codereview.chromium.org/736373003
109 lines
3.6 KiB
C++
109 lines
3.6 KiB
C++
/*
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* Copyright (C) 2010 Google, Inc. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SKY_ENGINE_CORE_HTML_PARSER_HTMLPARSERSCHEDULER_H_
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#define SKY_ENGINE_CORE_HTML_PARSER_HTMLPARSERSCHEDULER_H_
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#include "sky/engine/core/html/parser/NestingLevelIncrementer.h"
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#include "sky/engine/platform/Timer.h"
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#include "sky/engine/wtf/CurrentTime.h"
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#include "sky/engine/wtf/PassOwnPtr.h"
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#include "sky/engine/wtf/RefPtr.h"
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namespace blink {
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class Document;
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class HTMLDocumentParser;
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class ActiveParserSession {
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STACK_ALLOCATED();
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public:
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explicit ActiveParserSession(Document*);
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~ActiveParserSession();
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private:
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RefPtr<Document> m_document;
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};
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class PumpSession : public NestingLevelIncrementer, public ActiveParserSession {
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STACK_ALLOCATED();
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public:
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PumpSession(unsigned& nestingLevel, Document*);
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~PumpSession();
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int processedTokens;
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double startTime;
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bool needsYield;
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bool didSeeScript;
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};
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class HTMLParserScheduler {
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WTF_MAKE_NONCOPYABLE(HTMLParserScheduler); WTF_MAKE_FAST_ALLOCATED;
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public:
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static PassOwnPtr<HTMLParserScheduler> create(HTMLDocumentParser* parser)
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{
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return adoptPtr(new HTMLParserScheduler(parser));
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}
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~HTMLParserScheduler();
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// Inline as this is called after every token in the parser.
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void checkForYieldBeforeToken(PumpSession& session)
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{
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if (session.processedTokens > parserChunkSize || session.didSeeScript) {
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// currentTime() can be expensive. By delaying, we avoided calling
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// currentTime() when constructing non-yielding PumpSessions.
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if (!session.startTime)
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session.startTime = currentTime();
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session.processedTokens = 0;
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session.didSeeScript = false;
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double elapsedTime = currentTime() - session.startTime;
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if (elapsedTime > parserTimeLimit)
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session.needsYield = true;
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}
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++session.processedTokens;
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}
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void scheduleForResume();
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bool isScheduledForResume() const { return m_continueNextChunkTimer.isActive(); }
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private:
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static const double parserTimeLimit;
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static const int parserChunkSize;
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HTMLParserScheduler(HTMLDocumentParser*);
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void continueNextChunkTimerFired(Timer<HTMLParserScheduler>*);
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HTMLDocumentParser* m_parser;
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Timer<HTMLParserScheduler> m_continueNextChunkTimer;
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};
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}
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#endif // SKY_ENGINE_CORE_HTML_PARSER_HTMLPARSERSCHEDULER_H_
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