--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/oops/weakHandle.hpp	Tue Apr 10 10:06:42 2018 -0400
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2018, 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_OOPS_WEAKHANDLE_HPP
+#define SHARE_VM_OOPS_WEAKHANDLE_HPP
+
+#include "oops/oop.hpp"
+#include "runtime/handles.hpp"
+
+class outputStream;
+class OopStorage;
+
+// A WeakHandle is a pointer to an oop that is stored in an OopStorage that is
+// processed weakly by GC.  The runtime structures that point to the oop must
+// either peek or resolve the oop, the latter will keep the oop alive for
+// the GC cycle.  The runtime structures that reference the oop must test
+// if the value is NULL.  If it is NULL, it has been cleaned out by GC.
+// This is the vm version of jweak but has different GC lifetimes and policies,
+// depending on the type.
+
+enum WeakHandleType { vm_class_loader_data, vm_string };
+
+template <WeakHandleType T>
+class WeakHandle {
+ public:
+
+ private:
+  oop* _obj;
+
+  WeakHandle(oop* w) : _obj(w) {}
+  static OopStorage* get_storage();
+ public:
+  WeakHandle() : _obj(NULL) {} // needed for init
+
+  static WeakHandle create(Handle obj);
+  inline oop resolve() const;
+  inline oop peek() const;
+  void release() const;
+  bool is_null() const { return _obj == NULL; }
+
+  void print() const;
+  void print_on(outputStream* st) const;
+};
+
+#endif // SHARE_VM_OOPS_WEAKHANDLE_HPP