DCHECK: load event is dispatched after executeScript() iff m_isExternalScript

third_party/WebKit/Source/core/html/parser/HTMLParserScriptRunner.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 244 matching lines @@
           getTraceArgsForScriptElement(element, scriptStartPosition));
       scriptLoader->dispatchErrorEvent();
     } else {
       DCHECK(isExecutingScript());
       if (scriptParserBlockingTime > 0.0) {
         DocumentParserTiming::from(*m_document)
             .recordParserBlockedOnScriptLoadDuration(
                 monotonicallyIncreasingTime() - scriptParserBlockingTime,
                 scriptLoader->wasCreatedDuringDocumentWrite());
       }
+#if DCHECK_IS_ON()
+      DCHECK(scriptLoader->isExternalScript());
+#endif
       if (!doExecuteScript(element, sourceCode, scriptStartPosition)) {
         scriptLoader->dispatchErrorEvent();
       } else {
         element->dispatchEvent(Event::create(EventTypeNames::load));
       }
     }
 
     // 9. "Decrement the parser's script nesting level by one.
     //     If the parser's script nesting level is zero
     //     (which it always should be at this point),
@@ skipping 375 matching lines @@
         // "Immediately execute the script block,
         //  even if other scripts are already executing."
         // TODO(hiroshige): Merge the block into ScriptLoader::prepareScript().
         DCHECK_GT(m_reentryPermit->scriptNestingLevel(), 1u);
         if (m_parserBlockingScript)
           m_parserBlockingScript->dispose();
         m_parserBlockingScript = nullptr;
         ScriptSourceCode sourceCode(script->textContent(),
                                     documentURLForScriptExecution(m_document),
                                     scriptStartPosition);
+#if DCHECK_IS_ON()
+        DCHECK(!scriptLoader->isExternalScript());
+#endif
         doExecuteScript(script, sourceCode, scriptStartPosition);
       }
     } else {
       // 2nd Clause of Step 23.
       requestParsingBlockingScript(script);
     }
 
     // "Decrement the parser's script nesting level by one.
     //  If the parser's script nesting level is zero, then set the parser
     //  pause flag to false."
     // Implemented by ~ScriptNestingLevelIncrementer().
 
     // "Let the insertion point have the value of the old insertion point."
     // Implemented by ~InsertionPointRecord().
   }
 }
 
 DEFINE_TRACE(HTMLParserScriptRunner) {
   visitor->trace(m_document);
   visitor->trace(m_host);
   visitor->trace(m_parserBlockingScript);
   visitor->trace(m_scriptsToExecuteAfterParsing);
   PendingScriptClient::trace(visitor);
 }
 
 }  // namespace blink