The HTML parser synchronously creates custom elements

third_party/WebKit/Source/core/html/parser/HTMLScriptRunner.h

 /*
  * 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 11 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef HTMLScriptRunner_h
 #define HTMLScriptRunner_h
 
 #include "bindings/core/v8/ScriptStreamer.h"
 #include "core/dom/PendingScript.h"
 #include "core/fetch/ResourceClient.h"
+#include "core/html/parser/HTMLParserReentryPermit.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Deque.h"
-#include "wtf/PassRefPtr.h"
+#include "wtf/RefPtr.h"
 #include "wtf/text/TextPosition.h"
 
 namespace blink {
 
 class Resource;
 class Document;
 class Element;
 class HTMLScriptRunnerHost;
 
 class HTMLScriptRunner final : public GarbageCollectedFinalized<HTMLScriptRunner>, private ScriptResourceClient {
     WTF_MAKE_NONCOPYABLE(HTMLScriptRunner);
     USING_GARBAGE_COLLECTED_MIXIN(HTMLScriptRunner);
     USING_PRE_FINALIZER(HTMLScriptRunner, detach);
 public:
-    static HTMLScriptRunner* create(Document* document, HTMLScriptRunnerHost* host)
+    static HTMLScriptRunner* create(HTMLParserReentryPermit* reentryPermit, Document* document, HTMLScriptRunnerHost* host)
     {
-        return new HTMLScriptRunner(document, host);
+        return new HTMLScriptRunner(reentryPermit, document, host);
     }
     ~HTMLScriptRunner();
 
     void detach();
 
     // Processes the passed in script and any pending scripts if possible.
     void execute(Element* scriptToProcess, const TextPosition& scriptStartPosition);
 
     void executeScriptsWaitingForLoad(Resource*);
     bool hasScriptsWaitingForResources() const { return m_hasScriptsWaitingForResources; }
     void executeScriptsWaitingForResources();
     bool executeScriptsWaitingForParsing();
 
     bool hasParserBlockingScript() const;
-    bool isExecutingScript() const { return !!m_scriptNestingLevel; }
+    bool isExecutingScript() const { return !!m_reentryPermit->scriptNestingLevel(); }
 
     // ResourceClient
     void notifyFinished(Resource*) override;
     String debugName() const override { return "HTMLScriptRunner"; }
 
     DECLARE_TRACE();
 
 private:
-    HTMLScriptRunner(Document*, HTMLScriptRunnerHost*);
+    HTMLScriptRunner(HTMLParserReentryPermit*, Document*, HTMLScriptRunnerHost*);
 
     void executeParsingBlockingScript();
     void executePendingScriptAndDispatchEvent(PendingScript*, ScriptStreamer::Type);
     void executeParsingBlockingScripts();
 
     void requestParsingBlockingScript(Element*);
     void requestDeferredScript(Element*);
     bool requestPendingScript(PendingScript*, Element*) const;
 
     void runScript(Element*, const TextPosition& scriptStartPosition);
 
     bool isPendingScriptReady(const PendingScript*);
 
     void stopWatchingResourceForLoad(Resource*);
 
+    RefPtr<HTMLParserReentryPermit> m_reentryPermit;
     Member<Document> m_document;
     Member<HTMLScriptRunnerHost> m_host;
     Member<PendingScript> m_parserBlockingScript;
     // http://www.whatwg.org/specs/web-apps/current-work/#list-of-scripts-that-will-execute-when-the-document-has-finished-parsing
     HeapDeque<Member<PendingScript>> m_scriptsToExecuteAfterParsing;
-    unsigned m_scriptNestingLevel;
 
     // We only want stylesheet loads to trigger script execution if script
     // execution is currently stopped due to stylesheet loads, otherwise we'd
     // cause nested script execution when parsing <style> tags since </style>
     // tags can cause Document to call executeScriptsWaitingForResources.
     bool m_hasScriptsWaitingForResources;
 };
 
 } // namespace blink
 
 #endif