Merge the Sky Engine changes from the SkyDart branch

sky/engine/web/WebLeakDetector.cpp

-/*
- * Copyright (C) 2014 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:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "sky/engine/config.h"
-
-#include "sky/engine/public/web/WebLeakDetector.h"
-
-#include "sky/engine/bindings/core/v8/V8Binding.h"
-#include "sky/engine/bindings/core/v8/V8GCController.h"
-#include "sky/engine/core/dom/Document.h"
-#include "sky/engine/core/fetch/MemoryCache.h"
-#include "sky/engine/core/fetch/ResourceFetcher.h"
-#include "sky/engine/core/inspector/InspectorCounters.h"
-#include "sky/engine/core/rendering/RenderObject.h"
-#include "sky/engine/platform/Timer.h"
-#include "sky/engine/public/web/WebDocument.h"
-#include "sky/engine/public/web/WebLocalFrame.h"
-#include "v8/include/v8.h"
-
-namespace blink {
-
-namespace {
-
-// FIXME: Oilpan: It may take multiple GC to collect on-heap objects referenced from off-heap objects.
-// Please see comment in Heap::collectAllGarbage()
-static const int kNumberOfGCsToClaimChains = 5;
-
-class WebLeakDetectorImpl final : public WebLeakDetector {
-WTF_MAKE_NONCOPYABLE(WebLeakDetectorImpl);
-public:
-    explicit WebLeakDetectorImpl(WebLeakDetectorClient* client)
-        : m_client(client)
-        , m_delayedGCAndReportTimer(this, &WebLeakDetectorImpl::delayedGCAndReport)
-        , m_delayedReportTimer(this, &WebLeakDetectorImpl::delayedReport)
-        , m_numberOfGCNeeded(0)
-    {
-        ASSERT(m_client);
-    }
-
-    virtual ~WebLeakDetectorImpl() { }
-
-    virtual void collectGarbageAndGetDOMCounts(WebLocalFrame*) override;
-
-private:
-    void delayedGCAndReport(Timer<WebLeakDetectorImpl>*);
-    void delayedReport(Timer<WebLeakDetectorImpl>*);
-
-    WebLeakDetectorClient* m_client;
-    Timer<WebLeakDetectorImpl> m_delayedGCAndReportTimer;
-    Timer<WebLeakDetectorImpl> m_delayedReportTimer;
-    int m_numberOfGCNeeded;
-};
-
-void WebLeakDetectorImpl::collectGarbageAndGetDOMCounts(WebLocalFrame* frame)
-{
-    memoryCache()->evictResources();
-
-    {
-        RefPtr<Document> document = PassRefPtr<Document>(frame->document());
-        if (ResourceFetcher* fetcher = document->fetcher())
-            fetcher->garbageCollectDocumentResources();
-    }
-
-    // FIXME: HTML5 Notification should be closed because notification affects the result of number of DOM objects.
-
-    for (int i = 0; i < kNumberOfGCsToClaimChains; ++i)
-        V8GCController::collectGarbage(v8::Isolate::GetCurrent());
-    // Note: Oilpan precise GC is scheduled at the end of the event loop.
-
-    // Task queue may contain delayed object destruction tasks.
-    // This method is called from navigation hook inside FrameLoader,
-    // so previous document is still held by the loader until the next event loop.
-    // Complete all pending tasks before proceeding to gc.
-    m_numberOfGCNeeded = 2;
-    m_delayedGCAndReportTimer.startOneShot(0, FROM_HERE);
-}
-
-void WebLeakDetectorImpl::delayedGCAndReport(Timer<WebLeakDetectorImpl>*)
-{
-    // We do a second and third GC here to address flakiness
-    // The second GC is necessary as Resource GC may have postponed clean-up tasks to next event loop.
-    // The third GC is necessary for cleaning up Document after worker object died.
-
-    for (int i = 0; i < kNumberOfGCsToClaimChains; ++i)
-        V8GCController::collectGarbage(V8PerIsolateData::mainThreadIsolate());
-    // Note: Oilpan precise GC is scheduled at the end of the event loop.
-
-    // Inspect counters on the next event loop.
-    if (--m_numberOfGCNeeded)
-        m_delayedGCAndReportTimer.startOneShot(0, FROM_HERE);
-    else
-        m_delayedReportTimer.startOneShot(0, FROM_HERE);
-}
-
-void WebLeakDetectorImpl::delayedReport(Timer<WebLeakDetectorImpl>*)
-{
-    ASSERT(m_client);
-
-    WebLeakDetectorClient::Result result;
-    result.numberOfLiveDocuments = InspectorCounters::counterValue(InspectorCounters::DocumentCounter);
-    result.numberOfLiveNodes = InspectorCounters::counterValue(InspectorCounters::NodeCounter);
-    result.numberOfLiveRenderObjects = RenderObject::instanceCount();
-    result.numberOfLiveResources = Resource::instanceCount();
-
-    m_client->onLeakDetectionComplete(result);
-
-#ifndef NDEBUG
-    showLiveDocumentInstances();
-#endif
-}
-
-} // namespace
-
-WebLeakDetector* WebLeakDetector::create(WebLeakDetectorClient* client)
-{
-    return new WebLeakDetectorImpl(client);
-}
-
-} // namespace blink