The HTML parser synchronously creates custom elements

third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp

 /*
  * 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
@@ skipping 74 matching lines @@
     if (contextTag.matches(scriptTag))
         return reportErrors ? HTMLTokenizer::ScriptDataState : HTMLTokenizer::PLAINTEXTState;
     if (contextTag.matches(plaintextTag))
         return HTMLTokenizer::PLAINTEXTState;
     return HTMLTokenizer::DataState;
 }
 
 HTMLDocumentParser::HTMLDocumentParser(HTMLDocument& document, ParserSynchronizationPolicy syncPolicy)
     : HTMLDocumentParser(document, AllowScriptingContent, syncPolicy)
 {
-    m_scriptRunner = HTMLScriptRunner::create(&document, this);
+    m_scriptRunner = HTMLScriptRunner::create(m_reentryPermit, &document, this);
     m_treeBuilder = HTMLTreeBuilder::create(this, document, AllowScriptingContent, m_options);
 }
 
 HTMLDocumentParser::HTMLDocumentParser(DocumentFragment* fragment, Element* contextElement, ParserContentPolicy parserContentPolicy)
     : HTMLDocumentParser(fragment->document(), parserContentPolicy, ForceSynchronousParsing)
 {
     // No m_scriptRunner in fragment parser.
     m_treeBuilder = HTMLTreeBuilder::create(this, fragment, contextElement, parserContentPolicy, m_options);
 
     bool reportErrors = false; // For now document fragment parsing never reports errors.
     m_tokenizer->setState(tokenizerStateForContextElement(contextElement, reportErrors, m_options));
     m_xssAuditor.initForFragment();
 }
 
 HTMLDocumentParser::HTMLDocumentParser(Document& document, ParserContentPolicy contentPolicy, ParserSynchronizationPolicy syncPolicy)
     : ScriptableDocumentParser(document, contentPolicy)
     , m_options(&document)
+    , m_reentryPermit(new HTMLParserReentryPermit())
     , m_token(syncPolicy == ForceSynchronousParsing ? wrapUnique(new HTMLToken) : nullptr)
     , m_tokenizer(syncPolicy == ForceSynchronousParsing ? HTMLTokenizer::create(m_options) : nullptr)
     , m_loadingTaskRunner(TaskRunnerHelper::getLoadingTaskRunner(&document)->clone())
     , m_parserScheduler(syncPolicy == AllowAsynchronousParsing ? HTMLParserScheduler::create(this, m_loadingTaskRunner.get()) : nullptr)
     , m_xssAuditorDelegate(&document)
     , m_weakFactory(this)
     , m_preloader(HTMLResourcePreloader::create(document))
     , m_tokenizedChunkQueue(TokenizedChunkQueue::create())
     , m_evaluator(DocumentWriteEvaluator::create(document))
     , m_shouldUseThreading(syncPolicy == AllowAsynchronousParsing)
@@ skipping 16 matching lines @@
 void HTMLDocumentParser::dispose()
 {
     // In Oilpan, HTMLDocumentParser can die together with Document, and
     // detach() is not called in this case.
     if (m_haveBackgroundParser)
         stopBackgroundParser();
 }
 
 DEFINE_TRACE(HTMLDocumentParser)
 {
+    visitor->trace(m_reentryPermit);
     visitor->trace(m_treeBuilder);
     visitor->trace(m_parserScheduler);
     visitor->trace(m_xssAuditorDelegate);
     visitor->trace(m_scriptRunner);
     visitor->trace(m_preloader);
     ScriptableDocumentParser::trace(visitor);
     HTMLScriptRunnerHost::trace(visitor);
 }
 
 void HTMLDocumentParser::detach()
@@ skipping 787 matching lines @@
     // where the script is transfered from the treebuilder to the script runner.
     // The script runner will hold the script until its loaded and run. During
     // any of this time, we want to count ourselves as "waiting for a script" and thus
     // run the preload scanner, as well as delay completion of parsing.
     bool treeBuilderHasBlockingScript = m_treeBuilder->hasParserBlockingScript();
     bool scriptRunnerHasBlockingScript = m_scriptRunner && m_scriptRunner->hasParserBlockingScript();
     // Since the parser is paused while a script runner has a blocking script, it should
     // never be possible to end up with both objects holding a blocking script.
     ASSERT(!(treeBuilderHasBlockingScript && scriptRunnerHasBlockingScript));
     // If either object has a blocking script, the parser should be paused.
-    return treeBuilderHasBlockingScript || scriptRunnerHasBlockingScript;
+    return treeBuilderHasBlockingScript || scriptRunnerHasBlockingScript || m_reentryPermit->parserPauseFlag();
 }
 
 void HTMLDocumentParser::resumeParsingAfterScriptExecution()
 {
     ASSERT(!isExecutingScript());
     ASSERT(!isWaitingForScripts());
 
     if (m_haveBackgroundParser) {
         validateSpeculations(std::move(m_lastChunkBeforeScript));
         ASSERT(!m_lastChunkBeforeScript);
@@ skipping 202 matching lines @@
         (*WTF::bind(function, std::forward<Ps>(parameters)...))();
         return;
     case Asynchronous:
         m_loadingTaskRunner->postTask(BLINK_FROM_HERE, WTF::bind(function, std::forward<Ps>(parameters)...));
         return;
     }
     NOTREACHED();
 }
 
 } // namespace blink