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26 #ifndef HTMLParserScheduler_h
27 #define HTMLParserScheduler_h
29 #include "core/html/parser/NestingLevelIncrementer.h"
30 #include "platform/Timer.h"
31 #include "wtf/CurrentTime.h"
32 #include "wtf/PassOwnPtr.h"
33 #include "wtf/RefPtr.h"
38 class HTMLDocumentParser;
40 class ActiveParserSession {
42 explicit ActiveParserSession(Document*);
43 ~ActiveParserSession();
46 RefPtr<Document> m_document;
49 class PumpSession : public NestingLevelIncrementer, public ActiveParserSession {
51 PumpSession(unsigned& nestingLevel, Document*);
60 class HTMLParserScheduler {
61 WTF_MAKE_NONCOPYABLE(HTMLParserScheduler); WTF_MAKE_FAST_ALLOCATED;
63 static PassOwnPtr<HTMLParserScheduler> create(HTMLDocumentParser* parser)
65 return adoptPtr(new HTMLParserScheduler(parser));
67 ~HTMLParserScheduler();
69 // Inline as this is called after every token in the parser.
70 void checkForYieldBeforeToken(PumpSession& session)
72 if (session.processedTokens > parserChunkSize || session.didSeeScript) {
73 // currentTime() can be expensive. By delaying, we avoided calling
74 // currentTime() when constructing non-yielding PumpSessions.
75 if (!session.startTime)
76 session.startTime = currentTime();
78 session.processedTokens = 0;
79 session.didSeeScript = false;
81 double elapsedTime = currentTime() - session.startTime;
82 if (elapsedTime > parserTimeLimit)
83 session.needsYield = true;
85 ++session.processedTokens;
87 void checkForYieldBeforeScript(PumpSession&);
89 void scheduleForResume();
90 bool isScheduledForResume() const { return m_isSuspendedWithActiveTimer || m_continueNextChunkTimer.isActive(); }
96 static const double parserTimeLimit;
97 static const int parserChunkSize;
99 HTMLParserScheduler(HTMLDocumentParser*);
101 void continueNextChunkTimerFired(Timer<HTMLParserScheduler>*);
103 HTMLDocumentParser* m_parser;
105 Timer<HTMLParserScheduler> m_continueNextChunkTimer;
106 bool m_isSuspendedWithActiveTimer;