--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/jdk/jfr/cmd/ExecuteHelper.java	Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,140 @@
+/*
+ * 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+
+package jdk.jfr.cmd;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Arrays;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import jdk.jfr.Configuration;
+import jdk.jfr.Event;
+import jdk.jfr.Recording;
+import jdk.test.lib.process.OutputAnalyzer;
+import jdk.test.lib.process.ProcessTools;;
+
+final class ExecuteHelper {
+
+    public static Object[] array;
+
+    static class CustomEvent extends Event {
+        int intValue;
+        long longValue;
+        double doubliValue;
+        float floatValue;
+        String stringValue;
+        Short shortValue;
+        boolean booleanValue;
+        char charValue;
+        double trickyDouble;
+    }
+
+    public static OutputAnalyzer run(String... args) {
+        String[] array = new String[args.length + 1];
+        System.arraycopy(args, 0, array, 1, args.length);
+        array[0] = "jdk.jfr.internal.cmd.Execute";
+        try {
+            return ProcessTools.executeTestJava(array);
+        } catch (Exception e) {
+            String message = String.format("Caught exception while executing '%s'", Arrays.asList(array));
+            throw new RuntimeException(message, e);
+        }
+    }
+
+    public static void emitCustomEvents() {
+        // Custom events with potentially tricky values
+        CustomEvent event1 = new CustomEvent();
+        event1.trickyDouble = Double.NaN;
+        event1.intValue = Integer.MIN_VALUE;
+        event1.longValue = Long.MIN_VALUE;
+        event1.doubliValue = Double.MIN_VALUE;
+        event1.floatValue = Float.MIN_VALUE;
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < 512; i++) {
+            sb.append((char) i);
+        }
+        sb.append("\u2324");
+        event1.stringValue = sb.toString();
+        event1.shortValue = Short.MIN_VALUE;
+        event1.booleanValue = true;
+        event1.booleanValue = false;
+        event1.charValue = '\b';
+        event1.commit();
+
+        CustomEvent event2 = new CustomEvent();
+        event2.trickyDouble = Double.NEGATIVE_INFINITY;
+        event2.intValue = Integer.MAX_VALUE;
+        event2.longValue = Long.MAX_VALUE;
+        event2.doubliValue = Double.MAX_VALUE;
+        event2.floatValue = Float.MAX_VALUE;
+        event2.stringValue = null;
+        event2.shortValue = Short.MAX_VALUE;
+        event2.booleanValue = false;
+        event2.charValue = 0;
+        event2.commit();
+    }
+
+    public static Path createProfilingRecording() throws Exception {
+        Path file = Files.createTempFile("recording", ".jfr");
+        // Create a recording with some data
+        try (Recording r = new Recording(Configuration.getConfiguration("profile"))) {
+            r.start();
+
+            // Allocation event
+            array = new Object[1000000];
+            array = null;
+
+            // Class loading event etc
+            provokeClassLoading();
+
+            // GC events
+            System.gc();
+
+            // ExecutionSample
+            long t = System.currentTimeMillis();
+            while (System.currentTimeMillis() - t < 50) {
+                // do nothing
+            }
+
+            // Other periodic events, i.e CPU load
+            Thread.sleep(1000);
+
+            r.stop();
+            r.dump(file);
+        }
+
+        return file;
+    }
+
+    private static void provokeClassLoading() {
+       // Matching a string with regexp
+       // is expected to load some classes and generate some VM events
+       Pattern p = Pattern.compile("a*b");
+       Matcher m = p.matcher("aaaaab");
+       m.matches();
+    }
+}