--- /dev/null	2017-11-09 09:38:01.297999907 +0100
+++ new/src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.hpp	2018-04-09 14:29:24.791449544 +0200
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2016, 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_VM_JFR_INSTRUMENTATION_JFREVENTCLASSTRANSFORMER_HPP
+#define SHARE_VM_JFR_INSTRUMENTATION_JFREVENTCLASSTRANSFORMER_HPP
+
+#include "memory/allocation.hpp"
+#include "utilities/exceptions.hpp"
+
+class ClassFileParser;
+class InstanceKlass;
+
+//
+// Intercepts the initial class load of jdk.jfr.Event and subclasses.
+// Will replace the sent in InstanceKlass* with a class file schema extended InstanceKlass*.
+//
+class JfrEventClassTransformer : AllStatic {
+ public:
+  static void on_klass_creation(InstanceKlass*& ik, ClassFileParser& parser, TRAPS);
+  static void set_force_instrumentation(bool force_instrumentation);
+  static bool is_force_instrumentation();
+};
+
+#endif // SHARE_VM_JFR_INSTRUMENTATION_JFREVENTCLASSTRANSFORMER_HPP