diff -r 71564a544d4c -r d6dc479bcdd3 src/hotspot/share/code/codeBehaviours.hpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/code/codeBehaviours.hpp	Thu Nov 01 14:57:26 2018 +0100
@@ -0,0 +1,50 @@
+/*
+ * 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_CODE_CODEBEHAVIOURS_HPP
+#define SHARE_CODE_CODEBEHAVIOURS_HPP
+
+#include "memory/allocation.hpp"
+
+class CompiledMethod;
+
+class CompiledICProtectionBehaviour {
+  static CompiledICProtectionBehaviour* _current;
+
+public:
+  virtual bool lock(CompiledMethod* method) = 0;
+  virtual void unlock(CompiledMethod* method) = 0;
+  virtual bool is_safe(CompiledMethod* method) = 0;
+
+  static CompiledICProtectionBehaviour* current() { return _current; }
+  static void set_current(CompiledICProtectionBehaviour* current) { _current = current; }
+};
+
+class DefaultICProtectionBehaviour: public CompiledICProtectionBehaviour, public CHeapObj<mtInternal> {
+  virtual bool lock(CompiledMethod* method);
+  virtual void unlock(CompiledMethod* method);
+  virtual bool is_safe(CompiledMethod* method);
+};
+
+#endif // SHARE_CODE_CODEBEHAVIOURS_HPP