The Tor Browser: xpcom/glue/HoldDropJSObjects.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #ifndef mozilla_HoldDropJSObjects_h

     8 #define mozilla_HoldDropJSObjects_h

    10 #include "mozilla/TypeTraits.h"

    11 #include "nsCycleCollectionParticipant.h"

    13 class nsISupports;

    14 class nsScriptObjectTracer;

    16 // Only HoldJSObjects and DropJSObjects should be called directly.

    18 namespace mozilla {

    19 namespace cyclecollector {

    21 // These methods are defined in nsCycleCollector.cpp

    22 void HoldJSObjectsImpl(void* aHolder, nsScriptObjectTracer* aTracer);

    23 void HoldJSObjectsImpl(nsISupports* aHolder);

    24 void DropJSObjectsImpl(void* aHolder);

    25 void DropJSObjectsImpl(nsISupports* aHolder);

    27 } // namespace cyclecollector

    30 template<class T, bool isISupports=IsBaseOf<nsISupports, T>::value>

    31 struct HoldDropJSObjectsHelper

    32 {

    33   static void Hold(T* aHolder)

    34   {

    35     cyclecollector::HoldJSObjectsImpl(aHolder, NS_CYCLE_COLLECTION_PARTICIPANT(T));

    36   }

    37   static void Drop(T* aHolder)

    38   {

    39     cyclecollector::DropJSObjectsImpl(aHolder);

    40   }

    41 };

    43 template<class T>

    44 struct HoldDropJSObjectsHelper<T, true>

    45 {

    46   static void Hold(T* aHolder)

    47   {

    48     cyclecollector::HoldJSObjectsImpl(ToSupports(aHolder));

    49   }

    50   static void Drop(T* aHolder)

    51   {

    52     cyclecollector::DropJSObjectsImpl(ToSupports(aHolder));

    53   }

    54 };

    57 template<class T>

    58 void HoldJSObjects(T* aHolder)

    59 {

    60   HoldDropJSObjectsHelper<T>::Hold(aHolder);

    61 }

    63 template<class T>

    64 void DropJSObjects(T* aHolder)

    65 {

    66   HoldDropJSObjectsHelper<T>::Drop(aHolder);

    67 }

    69 } // namespace mozilla

    71 #endif // mozilla_HoldDropJSObjects_h

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