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/*
* 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 "config.h"
#include "public/web/WebLeakDetector.h"
#include "bindings/v8/V8Binding.h"
#include "bindings/v8/V8GCController.h"
#include "core/dom/Document.h"
#include "core/fetch/MemoryCache.h"
#include "core/fetch/ResourceFetcher.h"
#include "core/inspector/InspectorCounters.h"
#include "platform/Timer.h"
#include "public/web/WebDocument.h"
#include "public/web/WebLocalFrame.h"
#include <v8.h>
using namespace WebCore;
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)
{
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;
};
void WebLeakDetectorImpl::collectGarbageAndGetDOMCounts(WebLocalFrame* frame)
{
memoryCache()->evictResources();
{
RefPtrWillBeRawPtr<Document> document = PassRefPtrWillBeRawPtr<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_delayedGCAndReportTimer.startOneShot(0, FROM_HERE);
}
void WebLeakDetectorImpl::delayedGCAndReport(Timer<WebLeakDetectorImpl>*)
{
// We do a second GC here to address flakiness: Resource GC may have postponed clean-up tasks to next event loop.
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.
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);
m_client->onLeakDetectionComplete(result);
}
} // namespace
WebLeakDetector* WebLeakDetector::create(WebLeakDetectorClient* client)
{
return new WebLeakDetectorImpl(client);
}
} // namespace blink
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