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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
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77
xpcom/base/HoldDropJSObjects.h Normal file
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_HoldDropJSObjects_h
#define mozilla_HoldDropJSObjects_h
#include "mozilla/TypeTraits.h"
#include "nsCycleCollectionParticipant.h"
class nsISupports;
class nsScriptObjectTracer;
// Only HoldJSObjects and DropJSObjects should be called directly.
namespace mozilla {
namespace cyclecollector {
void HoldJSObjectsImpl(void* aHolder, nsScriptObjectTracer* aTracer);
void HoldJSObjectsImpl(nsISupports* aHolder);
void DropJSObjectsImpl(void* aHolder);
void DropJSObjectsImpl(nsISupports* aHolder);
} // namespace cyclecollector
template<class T, bool isISupports = IsBaseOf<nsISupports, T>::value>
struct HoldDropJSObjectsHelper
{
static void Hold(T* aHolder)
{
cyclecollector::HoldJSObjectsImpl(aHolder,
NS_CYCLE_COLLECTION_PARTICIPANT(T));
}
static void Drop(T* aHolder)
{
cyclecollector::DropJSObjectsImpl(aHolder);
}
};
template<class T>
struct HoldDropJSObjectsHelper<T, true>
{
static void Hold(T* aHolder)
{
cyclecollector::HoldJSObjectsImpl(ToSupports(aHolder));
}
static void Drop(T* aHolder)
{
cyclecollector::DropJSObjectsImpl(ToSupports(aHolder));
}
};
template<class T>
void
HoldJSObjects(T* aHolder)
{
HoldDropJSObjectsHelper<T>::Hold(aHolder);
}
template<class T>
void
DropJSObjects(T* aHolder)
{
HoldDropJSObjectsHelper<T>::Drop(aHolder);
}
#ifdef DEBUG
bool IsJSHolder(void* aHolder);
#endif
} // namespace mozilla
#endif // mozilla_HoldDropJSObjects_h