Oilpan: Schedule a precise GC when a page navigates

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 317 matching lines @@
 
 static bool acceptsEditingFocus(const Element& element)
 {
     ASSERT(element.hasEditableStyle());
 
     return element.document().frame() && element.rootEditableElement();
 }
 
 uint64_t Document::s_globalTreeVersion = 0;
 
-#ifndef NDEBUG
-using WeakDocumentSet = WillBeHeapHashSet<RawPtrWillBeWeakMember<Document>>;
-static WeakDocumentSet& liveDocumentSet()
+Document::WeakDocumentSet& Document::liveDocumentSet()
 {
     DEFINE_STATIC_LOCAL(OwnPtrWillBePersistent<WeakDocumentSet>, set, (adoptPtrWillBeNoop(new WeakDocumentSet())));
     return *set;
 }
-#endif
 
 // This class doesn't work with non-Document ExecutionContext.
 class AutofocusTask final : public ExecutionContextTask {
 public:
     static PassOwnPtr<AutofocusTask> create()
     {
         return adoptPtr(new AutofocusTask());
     }
     ~AutofocusTask() override { }
 
@@ skipping 72 matching lines @@
     , m_writeRecursionDepth(0)
     , m_taskRunner(MainThreadTaskRunner::create(this))
     , m_registrationContext(initializer.registrationContext(this))
     , m_elementDataCacheClearTimer(this, &Document::elementDataCacheClearTimerFired)
     , m_timeline(AnimationTimeline::create(this))
     , m_templateDocumentHost(nullptr)
     , m_didAssociateFormControlsTimer(this, &Document::didAssociateFormControlsTimerFired)
     , m_hasViewportUnits(false)
     , m_styleRecalcElementCounter(0)
     , m_parserSyncPolicy(AllowAsynchronousParsing)
+    , m_nodeCount(0)
 {
     if (m_frame) {
         ASSERT(m_frame->page());
         provideContextFeaturesToDocumentFrom(*this, *m_frame->page());
 
         m_fetcher = m_frame->loader().documentLoader()->fetcher();
         FrameFetchContext::provideDocumentToContext(m_fetcher->context(), this);
     } else if (m_importsController) {
         m_fetcher = FrameFetchContext::createContextAndFetcher(nullptr);
         FrameFetchContext::provideDocumentToContext(m_fetcher->context(), this);
@@ skipping 25 matching lines @@
     // CSSFontSelector, need to initialize m_styleEngine after initializing
     // m_fetcher.
     m_styleEngine = StyleEngine::create(*this);
 
     // The parent's parser should be suspended together with all the other objects,
     // else this new Document would have a new ExecutionContext which suspended state
     // would not match the one from the parent, and could start loading resources
     // ignoring the defersLoading flag.
     ASSERT(!parentDocument() || !parentDocument()->activeDOMObjectsAreSuspended());
 
-#ifndef NDEBUG
     liveDocumentSet().add(this);
-#endif
 }
 
 Document::~Document()
 {
     ASSERT(!layoutView());
     ASSERT(!parentTreeScope());
     // If a top document with a cache, verify that it was comprehensively
     // cleared during detach.
     ASSERT(!m_axObjectCache);
 #if !ENABLE(OILPAN)
@@ skipping 40 matching lines @@
     // We must call clearRareData() here since a Document class inherits TreeScope
     // as well as Node. See a comment on TreeScope.h for the reason.
     if (hasRareData())
         clearRareData();
 
     ASSERT(m_listsInvalidatedAtDocument.isEmpty());
 
     for (unsigned i = 0; i < WTF_ARRAY_LENGTH(m_nodeListCounts); ++i)
         ASSERT(!m_nodeListCounts[i]);
 
-#ifndef NDEBUG
     liveDocumentSet().remove(this);
 #endif
-#endif
 
     InstanceCounters::decrementCounter(InstanceCounters::DocumentCounter);
 }
 
 #if !ENABLE(OILPAN)
 void Document::dispose()
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!m_deletionHasBegun);
 
     // We must make sure not to be retaining any of our children through
@@ skipping 30 matching lines @@
         m_scriptedAnimationController->clearDocumentPointer();
     m_scriptedAnimationController.clear();
 
     if (svgExtensions())
         accessSVGExtensions().pauseAnimations();
 
     m_lifecycle.advanceTo(DocumentLifecycle::Disposed);
     DocumentLifecycleNotifier::notifyDocumentWasDisposed();
 
     m_canvasFontCache.clear();
+    m_nodeCount = 0;
 }
 #endif
 
 SelectorQueryCache& Document::selectorQueryCache()
 {
     if (!m_selectorQueryCache)
         m_selectorQueryCache = adoptPtr(new SelectorQueryCache());
     return *m_selectorQueryCache;
 }
 
@@ skipping 5164 matching lines @@
 }
 
 template class CORE_TEMPLATE_EXPORT WillBeHeapSupplement<Document>;
 
 } // namespace blink
 
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
-    WeakDocumentSet& set = liveDocumentSet();
+    Document::WeakDocumentSet& set = Document::liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().string().utf8().data());
 }
 #endif