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/v8/ScopedPersistent.h" 35 #include "platform/heap/Handle.h" 36 #include "wtf/PassRefPtr.h" 37 #include "wtf/RefCounted.h" 38 #include <v8.h> 39 40 namespace WebCore { 41 42 class GCObservation : public RefCountedWillBeGarbageCollectedFinalized<GCObservation> { 43 public: create(v8::Handle<v8::Value> observedValue)44 static PassRefPtrWillBeRawPtr<GCObservation> create(v8::Handle<v8::Value> observedValue) 45 { 46 return adoptRefWillBeNoop(new GCObservation(observedValue)); 47 } ~GCObservation()48 ~GCObservation() { } 49 50 // Caution: It is only feasible to determine whether an object was 51 // "near death"; it may have been kept alive through a weak 52 // handle. After reaching near-death, having been collected is the 53 // common case. wasCollected()54 bool wasCollected() const { return m_collected; } 55 void setWasCollected(); 56 trace(Visitor *)57 void trace(Visitor*) { } 58 59 private: 60 explicit GCObservation(v8::Handle<v8::Value>); 61 62 ScopedPersistent<v8::Value> m_observed; 63 bool m_collected; 64 }; 65 66 } 67 68 #endif // GCObservation_h 69