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72 lines
1.7 KiB
C++
72 lines
1.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_HoldDropJSObjects_h
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#define mozilla_HoldDropJSObjects_h
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#include "mozilla/TypeTraits.h"
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#include "nsCycleCollectionParticipant.h"
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class nsISupports;
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class nsScriptObjectTracer;
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// Only HoldJSObjects and DropJSObjects should be called directly.
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namespace mozilla {
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namespace cyclecollector {
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// These methods are defined in nsCycleCollector.cpp
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void HoldJSObjectsImpl(void* aHolder, nsScriptObjectTracer* aTracer);
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void HoldJSObjectsImpl(nsISupports* aHolder);
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void DropJSObjectsImpl(void* aHolder);
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void DropJSObjectsImpl(nsISupports* aHolder);
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} // namespace cyclecollector
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template<class T, bool isISupports=IsBaseOf<nsISupports, T>::value>
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struct HoldDropJSObjectsHelper
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{
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static void Hold(T* aHolder)
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{
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cyclecollector::HoldJSObjectsImpl(aHolder, NS_CYCLE_COLLECTION_PARTICIPANT(T));
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}
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static void Drop(T* aHolder)
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{
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cyclecollector::DropJSObjectsImpl(aHolder);
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}
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};
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template<class T>
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struct HoldDropJSObjectsHelper<T, true>
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{
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static void Hold(T* aHolder)
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{
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cyclecollector::HoldJSObjectsImpl(ToSupports(aHolder));
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}
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static void Drop(T* aHolder)
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{
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cyclecollector::DropJSObjectsImpl(ToSupports(aHolder));
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}
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};
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template<class T>
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void HoldJSObjects(T* aHolder)
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{
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HoldDropJSObjectsHelper<T>::Hold(aHolder);
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}
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template<class T>
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void DropJSObjects(T* aHolder)
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{
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HoldDropJSObjectsHelper<T>::Drop(aHolder);
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}
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} // namespace mozilla
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#endif // mozilla_HoldDropJSObjects_h
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