1 files changed, 39 insertions, 0 deletions
diff --git a/xpcom/glue/nsCycleCollectionParticipant.cpp b/xpcom/glue/nsCycleCollectionParticipant.cpp
new file mode 100644
index 000000000..973ef2ff5
--- /dev/null
+++ b/xpcom/glue/nsCycleCollectionParticipant.cpp
@@ -0,0 +1,39 @@
+/* -*- 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 "nsCycleCollectionParticipant.h"
+#include "nsCOMPtr.h"
+
+NS_IMETHODIMP_(void)
+nsXPCOMCycleCollectionParticipant::Root(void* aPtr)
+{
+  nsISupports* s = static_cast<nsISupports*>(aPtr);
+  NS_ADDREF(s);
+}
+
+NS_IMETHODIMP_(void)
+nsXPCOMCycleCollectionParticipant::Unroot(void* aPtr)
+{
+  nsISupports* s = static_cast<nsISupports*>(aPtr);
+  NS_RELEASE(s);
+}
+
+// We define a default trace function because some participants don't need
+// to trace anything, so it is okay for them not to define one.
+NS_IMETHODIMP_(void)
+nsXPCOMCycleCollectionParticipant::Trace(void* aPtr, const TraceCallbacks& aCb,
+                                         void* aClosure)
+{
+}
+
+bool
+nsXPCOMCycleCollectionParticipant::CheckForRightISupports(nsISupports* aSupports)
+{
+  nsISupports* foo;
+  aSupports->QueryInterface(NS_GET_IID(nsCycleCollectionISupports),
+                            reinterpret_cast<void**>(&foo));
+  return aSupports == foo;
+}