xpcom/base/nsCycleCollectionParticipant.cpp

   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/. */
   6
   7 #include "nsCycleCollectionParticipant.h"
   8 #include "nsCOMPtr.h"
   9
  10 NS_IMETHODIMP_(void)
  11 nsXPCOMCycleCollectionParticipant::Root(void* aPtr) {
  12   nsISupports* s = static_cast<nsISupports*>(aPtr);
  13   NS_ADDREF(s);
  14 }
  15
  16 NS_IMETHODIMP_(void)
  17 nsXPCOMCycleCollectionParticipant::Unroot(void* aPtr) {
  18   nsISupports* s = static_cast<nsISupports*>(aPtr);
  19   NS_RELEASE(s);
  20 }
  21
  22 // We define a default trace function because some participants don't need
  23 // to trace anything, so it is okay for them not to define one.
  24 NS_IMETHODIMP_(void)
  25 nsXPCOMCycleCollectionParticipant::Trace(void* aPtr, const TraceCallbacks& aCb,
  26                                          void* aClosure) {}
  27
  28 bool nsXPCOMCycleCollectionParticipant::CheckForRightISupports(
  29     nsISupports* aSupports) {
  30   nsISupports* foo;
  31   aSupports->QueryInterface(NS_GET_IID(nsCycleCollectionISupports),
  32                             reinterpret_cast<void**>(&foo));
  33   return aSupports == foo;
  34 }