--- /dev/null	2020-01-17 11:46:19.065201212 +0100
+++ new/src/hotspot/share/gc/shenandoah/shenandoahRuntime.hpp	2020-01-17 17:10:35.208129096 +0100
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
+ *
+ * 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_SHENANDOAH_SHENANDOAHRUNTIME_HPP
+#define SHARE_VM_GC_SHENANDOAH_SHENANDOAHRUNTIME_HPP
+
+#include "memory/allocation.hpp"
+#include "oops/oopsHierarchy.hpp"
+
+class HeapWord;
+class JavaThread;
+class oopDesc;
+
+class ShenandoahRuntime : public AllStatic {
+public:
+  static void write_ref_array_pre_oop_entry(oop* src, oop* dst, size_t length);
+  static void write_ref_array_pre_narrow_oop_entry(narrowOop* src, narrowOop* dst, size_t length);
+  static void write_ref_array_pre_duinit_oop_entry(oop* src, oop* dst, size_t length);
+  static void write_ref_array_pre_duinit_narrow_oop_entry(narrowOop* src, narrowOop* dst, size_t length);
+  static void write_ref_field_pre_entry(oopDesc* orig, JavaThread* thread);
+
+  static oopDesc* load_reference_barrier(oopDesc* src, oop* load_addr);
+  static oopDesc* load_reference_barrier_narrow(oopDesc* src, narrowOop* load_addr);
+
+  static void shenandoah_clone_barrier(oopDesc* src);
+};
+
+#endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHRUNTIME_HPP