1/* 2 * Copyright (C) 2013 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#ifndef GCObservation_h 32#define GCObservation_h 33 34#include "bindings/core/v8/ScopedPersistent.h" 35#include "bindings/core/v8/ScriptWrappable.h" 36#include "platform/heap/Handle.h" 37#include "wtf/PassRefPtr.h" 38#include "wtf/RefCounted.h" 39#include <v8.h> 40 41namespace blink { 42 43class GCObservation FINAL : public GarbageCollectedFinalized<GCObservation>, public ScriptWrappable { 44 DEFINE_WRAPPERTYPEINFO(); 45public: 46 static GCObservation* create(v8::Handle<v8::Value> observedValue) 47 { 48 return new GCObservation(observedValue); 49 } 50 51 // Caution: It is only feasible to determine whether an object was 52 // "near death"; it may have been kept alive through a weak 53 // handle. After reaching near-death, having been collected is the 54 // common case. 55 bool wasCollected() const { return m_collected; } 56 void setWasCollected(); 57 58 void trace(Visitor*) { } 59 60private: 61 explicit GCObservation(v8::Handle<v8::Value>); 62 63 ScopedPersistent<v8::Value> m_observed; 64 bool m_collected; 65}; 66 67} // namespace blink 68 69#endif // GCObservation_h 70