Add a lifecycle state machine for Document

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 472 matching lines @@
     if (initializer.shouldSetURL())
         setURL(initializer.url());
 
     initSecurityContext(initializer);
     initDNSPrefetch();
 
     for (unsigned i = 0; i < WTF_ARRAY_LENGTH(m_nodeListCounts); i++)
         m_nodeListCounts[i] = 0;
 
     InspectorCounters::incrementCounter(InspectorCounters::DocumentCounter);
+
+    m_lifecyle.advanceTo(DocumentLifecycle::Inactive);
 }
 
 static bool isAttributeOnAllOwners(const WebCore::QualifiedName& attribute, const WebCore::QualifiedName& prefixedAttribute, const HTMLFrameOwnerElement* owner)
 {
     if (!owner)
         return true;
     do {
         if (!(owner->hasAttribute(attribute) || owner->hasAttribute(prefixedAttribute)))
             return false;
     } while ((owner = owner->document().ownerElement()));
@@ skipping 103 matching lines @@
     m_cssCanvasElements.clear();
 
     // FIXME: consider using ActiveDOMObject.
     if (m_scriptedAnimationController)
         m_scriptedAnimationController->clearDocumentPointer();
     m_scriptedAnimationController.clear();
 
     if (svgExtensions())
         accessSVGExtensions()->pauseAnimations();
 
+    m_lifecyle.advanceTo(DocumentLifecycle::Disposed);
     lifecycleNotifier()->notifyDocumentWasDisposed();
 }
 
 SelectorQueryCache* Document::selectorQueryCache()
 {
     if (!m_selectorQueryCache)
         m_selectorQueryCache = adoptPtr(new SelectorQueryCache());
     return m_selectorQueryCache.get();
 }
 
@@ skipping 1349 matching lines @@
 
     // Create the rendering tree
     setRenderer(new RenderView(this));
     renderView()->setIsInWindow(true);
 
     recalcStyle(Force);
 
     m_styleResolverThrowawayTimer.startRepeating(60);
 
     ContainerNode::attach(context);
+
+    m_lifecyle.advanceTo(DocumentLifecycle::Active);
 }
 
 void Document::detach(const AttachContext& context)
 {
+    m_lifecyle.advanceTo(DocumentLifecycle::Stopping);
+
     ASSERT(confusingAndOftenMisusedAttached());
 
     if (page())
         page()->documentDetached(this);
 
     if (this == topDocument())
         clearAXObjectCache();
 
     stopActiveDOMObjects();
     m_eventQueue->close();
@@ skipping 43 matching lines @@
     // us. However, this violates Node::detach() semantics, as it's never
     // possible to re-attach. Eventually Document::detach() should be renamed,
     // or this setting of the frame to 0 could be made explicit in each of the
     // callers of Document::detach().
     m_frame = 0;
 
     if (m_mediaQueryMatcher)
         m_mediaQueryMatcher->documentDestroyed();
 
     lifecycleNotifier()->notifyDocumentWasDetached();
+    m_lifecyle.advanceTo(DocumentLifecycle::Stopped);
 }
 
 void Document::prepareForDestruction()
 {
     disconnectDescendantFrames();
 
     // The process of disconnecting descendant frames could have already
     // detached us.
     if (!confusingAndOftenMisusedAttached())
         return;
@@ skipping 3367 matching lines @@
 {
     return DocumentLifecycleNotifier::create(this);
 }
 
 DocumentLifecycleNotifier* Document::lifecycleNotifier()
 {
     return static_cast<DocumentLifecycleNotifier*>(ScriptExecutionContext::lifecycleNotifier());
 }
 
 } // namespace WebCore