xpcom/base/HoldDropJSObjects.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 "mozilla/HoldDropJSObjects.h"
   8
   9 #include "mozilla/Assertions.h"
  10 #include "mozilla/CycleCollectedJSRuntime.h"
  11
  12 namespace mozilla {
  13 namespace cyclecollector {
  14
  15 void HoldJSObjectsImpl(void* aHolder, nsScriptObjectTracer* aTracer,
  16                        JS::Zone* aZone) {
  17   CycleCollectedJSRuntime* rt = CycleCollectedJSRuntime::Get();
  18   MOZ_ASSERT(rt, "Should have a CycleCollectedJSRuntime by now");
  19   rt->AddJSHolder(aHolder, aTracer, aZone);
  20 }
  21
  22 void HoldJSObjectsImpl(nsISupports* aHolder) {
  23   nsXPCOMCycleCollectionParticipant* participant = nullptr;
  24   CallQueryInterface(aHolder, &participant);
  25   MOZ_ASSERT(participant, "Failed to QI to nsXPCOMCycleCollectionParticipant!");
  26   MOZ_ASSERT(
  27       participant->CheckForRightISupports(aHolder),
  28       "The result of QIing a JS holder should be the same as ToSupports");
  29
  30   HoldJSObjectsImpl(aHolder, participant);
  31 }
  32
  33 void DropJSObjectsImpl(void* aHolder) {
  34   CycleCollectedJSRuntime* rt = CycleCollectedJSRuntime::Get();
  35   MOZ_ASSERT(rt, "Should have a CycleCollectedJSRuntime by now");
  36   rt->RemoveJSHolder(aHolder);
  37 }
  38
  39 void DropJSObjectsImpl(nsISupports* aHolder) {
  40 #ifdef DEBUG
  41   nsXPCOMCycleCollectionParticipant* participant = nullptr;
  42   CallQueryInterface(aHolder, &participant);
  43   MOZ_ASSERT(participant, "Failed to QI to nsXPCOMCycleCollectionParticipant!");
  44   MOZ_ASSERT(
  45       participant->CheckForRightISupports(aHolder),
  46       "The result of QIing a JS holder should be the same as ToSupports");
  47 #endif
  48   DropJSObjectsImpl(static_cast<void*>(aHolder));
  49 }
  50
  51 }  // namespace cyclecollector
  52
  53 }  // namespace mozilla