--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/g1/g1OopStarChunkedList.hpp	Fri Dec 07 13:54:45 2018 +0100
@@ -0,0 +1,64 @@
+/*
+ * 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_GC_G1_G1OOPSTARCHUNKEDLIST_HPP
+#define SHARE_GC_G1_G1OOPSTARCHUNKEDLIST_HPP
+
+#include "oops/oopsHierarchy.hpp"
+#include "utilities/chunkedList.hpp"
+
+class OopClosure;
+
+class G1OopStarChunkedList : public CHeapObj<mtGC> {
+  size_t _used_memory;
+
+  ChunkedList<oop*, mtGC>* _roots;
+  ChunkedList<narrowOop*, mtGC>* _croots;
+  ChunkedList<oop*, mtGC>* _oops;
+  ChunkedList<narrowOop*, mtGC>* _coops;
+
+  template <typename T> void delete_list(ChunkedList<T*, mtGC>* c);
+
+  template <typename T>
+  void chunks_do(ChunkedList<T*, mtGC>* head,
+                 OopClosure* cl);
+
+  template <typename T>
+  inline void push(ChunkedList<T*, mtGC>** field, T* p);
+
+ public:
+  G1OopStarChunkedList() : _used_memory(0), _roots(NULL), _croots(NULL), _oops(NULL), _coops(NULL) {}
+  ~G1OopStarChunkedList();
+
+  size_t used_memory() { return _used_memory; }
+
+  void oops_do(OopClosure* obj_cl, OopClosure* root_cl);
+
+  inline void push_oop(oop* p);
+  inline void push_oop(narrowOop* p);
+  inline void push_root(oop* p);
+  inline void push_root(narrowOop* p);
+};
+
+#endif // SHARE_GC_G1_G1OOPSTARCHUNKEDLIST_HPP