Track whether an element was inserted via document.write

third_party/WebKit/Source/core/dom/ScriptLoader.h

 /*
  * Copyright (C) 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef ScriptLoader_h
 #define ScriptLoader_h
 
 #include "core/CoreExport.h"
 #include "core/dom/PendingScript.h"
 #include "core/fetch/FetchRequest.h"
 #include "core/fetch/ResourceClient.h"
 #include "core/fetch/ScriptResource.h"
+#include "core/html/parser/HTMLConstructionSite.h"
 #include "wtf/text/TextPosition.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class Element;
 class ScriptLoaderClient;
 class ScriptSourceCode;
 class LocalFrame;
 
+enum ElementConstructionContextFlags {

[kouhei (in TOK), 2016/04/05 13:20:45]

Thanks for this change!

Would you use enum class : int like
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit...

+    DefaultContext = 0,
+    ParserInserted = 1 << 0,
+    AlreadyStarted = 1 << 1,
+    CreatedDuringDocumentWrite = 1 << 2,
+};
+
 class CORE_EXPORT ScriptLoader : public GarbageCollectedFinalized<ScriptLoader>, public ScriptResourceClient {
 public:
-    static RawPtr<ScriptLoader> create(Element* element, bool createdByParser, bool isEvaluated)
+    static RawPtr<ScriptLoader> create(Element* element, int constructionContextFlags)
     {
-        return new ScriptLoader(element, createdByParser, isEvaluated);
+        return new ScriptLoader(element, constructionContextFlags);
     }
 
     ~ScriptLoader() override;
     DECLARE_VIRTUAL_TRACE();
 
     Element* element() const { return m_element; }
 
     enum LegacyTypeSupport { DisallowLegacyTypeInTypeAttribute, AllowLegacyTypeInTypeAttribute };
     bool prepareScript(const TextPosition& scriptStartPosition = TextPosition::minimumPosition(), LegacyTypeSupport = DisallowLegacyTypeInTypeAttribute);
 
@@ skipping 24 matching lines @@
     void childrenChanged();
     void handleSourceAttribute(const String& sourceUrl);
     void handleAsyncAttribute();
 
     virtual bool isReady() const { return m_pendingScript && m_pendingScript->isReady(); }
     bool errorOccurred() const { return m_pendingScript && m_pendingScript->errorOccurred(); }
 
     // Clears the connection to the PendingScript (and Element and Resource).
     void detach();
 
+    bool wasCreatedDuringDocumentWrite() { return m_wasCreatedDuringDocumentWrite; }
+
 protected:
-    ScriptLoader(Element*, bool createdByParser, bool isEvaluated);
+    ScriptLoader(Element*, int constructionContextFlags);
 
 private:
     bool ignoresLoadRequest() const;
     bool isScriptForEventSupported() const;
     void logScriptMimetype(ScriptResource*, LocalFrame*, String);
 
     bool fetchScript(const String& sourceUrl, FetchRequest::DeferOption);
 
     ScriptLoaderClient* client() const;
 
     // ResourceClient
     void notifyFinished(Resource*) override;
     String debugName() const override { return "ScriptLoader"; }
 
     Member<Element> m_element;
     Member<ScriptResource> m_resource;
     WTF::OrdinalNumber m_startLineNumber;
     String m_characterEncoding;
     String m_fallbackCharacterEncoding;
 
     bool m_parserInserted : 1;
     bool m_isExternalScript : 1;
     bool m_alreadyStarted : 1;
     bool m_haveFiredLoad : 1;
     bool m_willBeParserExecuted : 1; // Same as "The parser will handle executing the script."
     bool m_readyToBeParserExecuted : 1;
     bool m_willExecuteInOrder : 1;
     bool m_willExecuteWhenDocumentFinishedParsing : 1;
     bool m_forceAsync : 1;
+    const bool m_wasCreatedDuringDocumentWrite : 1;

[kouhei (in TOK), 2016/04/05 13:20:45]

can we store constructioncontext instead of expanding flags?

 
     Member<PendingScript> m_pendingScript;
 };
 
 ScriptLoader* toScriptLoaderIfPossible(Element*);
 
 } // namespace blink
 
 #endif // ScriptLoader_h