1 files changed, 53 insertions, 0 deletions
diff --git a/xpcom/base/HoldDropJSObjects.cpp b/xpcom/base/HoldDropJSObjects.cpp
new file mode 100644
index 0000000000..2b3a810d89
--- /dev/null
+++ b/xpcom/base/HoldDropJSObjects.cpp
@@ -0,0 +1,53 @@
+/* -*- 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/. */
+
+#include "mozilla/HoldDropJSObjects.h"
+
+#include "mozilla/Assertions.h"
+#include "mozilla/CycleCollectedJSRuntime.h"
+
+namespace mozilla {
+namespace cyclecollector {
+
+void HoldJSObjectsImpl(void* aHolder, nsScriptObjectTracer* aTracer,
+                       JS::Zone* aZone) {
+  CycleCollectedJSRuntime* rt = CycleCollectedJSRuntime::Get();
+  MOZ_ASSERT(rt, "Should have a CycleCollectedJSRuntime by now");
+  rt->AddJSHolder(aHolder, aTracer, aZone);
+}
+
+void HoldJSObjectsImpl(nsISupports* aHolder) {
+  nsXPCOMCycleCollectionParticipant* participant = nullptr;
+  CallQueryInterface(aHolder, &participant);
+  MOZ_ASSERT(participant, "Failed to QI to nsXPCOMCycleCollectionParticipant!");
+  MOZ_ASSERT(
+      participant->CheckForRightISupports(aHolder),
+      "The result of QIing a JS holder should be the same as ToSupports");
+
+  HoldJSObjectsImpl(aHolder, participant);
+}
+
+void DropJSObjectsImpl(void* aHolder) {
+  CycleCollectedJSRuntime* rt = CycleCollectedJSRuntime::Get();
+  MOZ_ASSERT(rt, "Should have a CycleCollectedJSRuntime by now");
+  rt->RemoveJSHolder(aHolder);
+}
+
+void DropJSObjectsImpl(nsISupports* aHolder) {
+#ifdef DEBUG
+  nsXPCOMCycleCollectionParticipant* participant = nullptr;
+  CallQueryInterface(aHolder, &participant);
+  MOZ_ASSERT(participant, "Failed to QI to nsXPCOMCycleCollectionParticipant!");
+  MOZ_ASSERT(
+      participant->CheckForRightISupports(aHolder),
+      "The result of QIing a JS holder should be the same as ToSupports");
+#endif
+  DropJSObjectsImpl(static_cast<void*>(aHolder));
+}
+
+}  // namespace cyclecollector
+
+}  // namespace mozilla