1 files changed, 68 insertions, 0 deletions
diff --git a/xpcom/base/HoldDropJSObjects.cpp b/xpcom/base/HoldDropJSObjects.cpp
new file mode 100644
index 000000000..eeecc7121
--- /dev/null
+++ b/xpcom/base/HoldDropJSObjects.cpp
@@ -0,0 +1,68 @@
+/* -*- 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/CycleCollectedJSContext.h"
+
+namespace mozilla {
+namespace cyclecollector {
+
+void
+HoldJSObjectsImpl(void* aHolder, nsScriptObjectTracer* aTracer)
+{
+  CycleCollectedJSContext* cx = CycleCollectedJSContext::Get();
+  MOZ_ASSERT(cx, "Should have a CycleCollectedJSContext by now");
+  cx->AddJSHolder(aHolder, aTracer);
+}
+
+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)
+{
+  CycleCollectedJSContext* cx = CycleCollectedJSContext::Get();
+  MOZ_ASSERT(cx, "Should have a CycleCollectedJSContext by now");
+  cx->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
+
+#ifdef DEBUG
+bool
+IsJSHolder(void* aHolder)
+{
+  CycleCollectedJSContext* cx = CycleCollectedJSContext::Get();
+  MOZ_ASSERT(cx, "Should have a CycleCollectedJSContext by now");
+  return cx->IsJSHolder(aHolder);
+}
+#endif
+
+} // namespace mozilla