1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/xpcom/glue/HoldDropJSObjects.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,71 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim: set ts=8 sts=2 et sw=2 tw=80: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef mozilla_HoldDropJSObjects_h
1.11 +#define mozilla_HoldDropJSObjects_h
1.12 +
1.13 +#include "mozilla/TypeTraits.h"
1.14 +#include "nsCycleCollectionParticipant.h"
1.15 +
1.16 +class nsISupports;
1.17 +class nsScriptObjectTracer;
1.18 +
1.19 +// Only HoldJSObjects and DropJSObjects should be called directly.
1.20 +
1.21 +namespace mozilla {
1.22 +namespace cyclecollector {
1.23 +
1.24 +// These methods are defined in nsCycleCollector.cpp
1.25 +void HoldJSObjectsImpl(void* aHolder, nsScriptObjectTracer* aTracer);
1.26 +void HoldJSObjectsImpl(nsISupports* aHolder);
1.27 +void DropJSObjectsImpl(void* aHolder);
1.28 +void DropJSObjectsImpl(nsISupports* aHolder);
1.29 +
1.30 +} // namespace cyclecollector
1.31 +
1.32 +
1.33 +template<class T, bool isISupports=IsBaseOf<nsISupports, T>::value>
1.34 +struct HoldDropJSObjectsHelper
1.35 +{
1.36 + static void Hold(T* aHolder)
1.37 + {
1.38 + cyclecollector::HoldJSObjectsImpl(aHolder, NS_CYCLE_COLLECTION_PARTICIPANT(T));
1.39 + }
1.40 + static void Drop(T* aHolder)
1.41 + {
1.42 + cyclecollector::DropJSObjectsImpl(aHolder);
1.43 + }
1.44 +};
1.45 +
1.46 +template<class T>
1.47 +struct HoldDropJSObjectsHelper<T, true>
1.48 +{
1.49 + static void Hold(T* aHolder)
1.50 + {
1.51 + cyclecollector::HoldJSObjectsImpl(ToSupports(aHolder));
1.52 + }
1.53 + static void Drop(T* aHolder)
1.54 + {
1.55 + cyclecollector::DropJSObjectsImpl(ToSupports(aHolder));
1.56 + }
1.57 +};
1.58 +
1.59 +
1.60 +template<class T>
1.61 +void HoldJSObjects(T* aHolder)
1.62 +{
1.63 + HoldDropJSObjectsHelper<T>::Hold(aHolder);
1.64 +}
1.65 +
1.66 +template<class T>
1.67 +void DropJSObjects(T* aHolder)
1.68 +{
1.69 + HoldDropJSObjectsHelper<T>::Drop(aHolder);
1.70 +}
1.71 +
1.72 +} // namespace mozilla
1.73 +
1.74 +#endif // mozilla_HoldDropJSObjects_h
