--- /dev/null	2019-02-14 11:31:37.500399000 +0100
+++ new/src/hotspot/share/gc/z/zNMethod.hpp	2019-02-20 22:12:28.368526140 +0100
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2017, 2019, 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_Z_ZNMETHOD_HPP
+#define SHARE_GC_Z_ZNMETHOD_HPP
+
+#include "memory/allocation.hpp"
+
+class nmethod;
+class OopClosure;
+class ZReentrantLock;
+class ZWorkers;
+
+class ZNMethod : public AllStatic {
+private:
+  static void attach_gc_data(nmethod* nm);
+  static void detach_gc_data(nmethod* nm);
+
+  static void log_register(const nmethod* nm);
+  static void log_unregister(const nmethod* nm);
+
+public:
+  static void register_nmethod(nmethod* nm);
+  static void unregister_nmethod(nmethod* nm);
+
+  static void disarm_nmethod(nmethod* nm);
+
+  static void nmethod_oops_do(nmethod* nm, OopClosure* cl);
+
+  static void oops_do_begin();
+  static void oops_do_end();
+  static void oops_do(OopClosure* cl);
+
+  static ZReentrantLock* lock_for_nmethod(nmethod* nm);
+
+  static void unlink(ZWorkers* workers, bool unloading_occurred);
+  static void purge(ZWorkers* workers);
+};
+
+#endif // SHARE_GC_Z_ZNMETHOD_HPP