--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shared/weakProcessor.hpp	Wed Oct 18 21:13:35 2017 +0200
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_GC_SHARED_WEAKPROCESSOR_HPP
+#define SHARE_VM_GC_SHARED_WEAKPROCESSOR_HPP
+
+#include "memory/allocation.hpp"
+#include "memory/iterator.hpp"
+
+// Helper class to aid in root scanning and cleaning of weak oops in the VM.
+//
+// New containers of weak oops added to this class will automatically
+// be cleaned by all GCs, including the young generation GCs.
+class WeakProcessor : AllStatic {
+public:
+  // Visit all oop*s and apply the keep_alive closure if the referenced
+  // object is considered alive by the is_alive closure, otherwise do some
+  // container specific cleanup of element holding the oop.
+  //
+  // The complete closure is used as a post-processing step,
+  // called after all container have been processed.
+  static void weak_oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, VoidClosure* complete = NULL);
+
+  // Visit all oop*s and apply the given closure.
+  static void oops_do(OopClosure* closure);
+};
+
+#endif // SHARE_VM_GC_SHARED_WEAKPROCESSOR_HPP