--- /dev/null	2018-05-09 06:13:36.966491568 +0200
+++ new/src/hotspot/share/memory/metaspace/metabase.hpp	2018-05-09 12:24:39.683630147 +0200
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2012, 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_MEMORY_METASPACE_METABASE_HPP_
+#define SHARE_MEMORY_METASPACE_METABASE_HPP_
+
+#include "utilities/globalDefinitions.hpp"
+
+namespace metaspace {
+namespace internals {
+
+// Super class of Metablock and Metachunk to allow them to
+// be put on the FreeList and in the BinaryTreeDictionary.
+template <class T>
+class Metabase {
+  size_t _word_size;
+  T*     _next;
+  T*     _prev;
+
+ protected:
+  Metabase(size_t word_size) : _word_size(word_size), _next(NULL), _prev(NULL) {}
+
+ public:
+  T* next() const         { return _next; }
+  T* prev() const         { return _prev; }
+  void set_next(T* v)     { _next = v; assert(v != this, "Boom");}
+  void set_prev(T* v)     { _prev = v; assert(v != this, "Boom");}
+  void clear_next()       { set_next(NULL); }
+  void clear_prev()       { set_prev(NULL); }
+
+  size_t size() const volatile { return _word_size; }
+  void set_size(size_t v) { _word_size = v; }
+
+  void link_next(T* ptr)  { set_next(ptr); }
+  void link_prev(T* ptr)  { set_prev(ptr); }
+  void link_after(T* ptr) {
+    link_next(ptr);
+    if (ptr != NULL) ptr->link_prev((T*)this);
+  }
+
+  uintptr_t* end() const        { return ((uintptr_t*) this) + size(); }
+
+  bool cantCoalesce() const     { return false; }
+
+  // Debug support
+#ifdef ASSERT
+  void* prev_addr() const { return (void*)&_prev; }
+  void* next_addr() const { return (void*)&_next; }
+  void* size_addr() const { return (void*)&_word_size; }
+#endif
+  bool verify_chunk_in_free_list(T* tc) const { return true; }
+  bool verify_par_locked() { return true; }
+
+  void assert_is_mangled() const {/* Don't check "\*/}
+
+  bool is_free()                 { return true; }
+};
+
+} // namespace metaspace
+} // namespace internals
+
+
+#endif /* SHARE_MEMORY_METASPACE_METABASE_HPP_ */