--- /dev/null	2020-01-02 04:43:18.583999853 +0000
+++ new/src/share/classes/jdk/jfr/internal/tool/Main.java	2020-01-30 06:27:47.269187196 +0000
@@ -0,0 +1,110 @@
+/*
+ * 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.internal.tool;
+
+import java.util.Arrays;
+import java.util.Deque;
+import java.util.LinkedList;
+
+/**
+ * Launcher class for the JDK_HOME\bin\jfr tool
+ *
+ */
+public final class Main {
+
+    private static final int EXIT_OK = 0;
+    private static final int EXIT_FAILED = 1;
+    private static final int EXIT_WRONG_ARGUMENTS = 2;
+
+    public static void main(String... args) {
+        Deque<String> argList = new LinkedList<>(Arrays.asList(args));
+        if (argList.isEmpty()) {
+            System.out.println(Command.title);
+            System.out.println();
+            System.out.println("Before using this tool, you must have a recording file.");
+            System.out.println("A file can be created by starting a recording from command line:");
+            System.out.println();
+            System.out.println(" java -XX:StartFlightRecording:filename=recording.jfr,duration=30s ... ");
+            System.out.println();
+            System.out.println("A recording can also be started on already running Java Virtual Machine:");
+            System.out.println();
+            System.out.println(" jcmd (to list available pids)");
+            System.out.println(" jcmd <pid> JFR.start");
+            System.out.println();
+            System.out.println("Recording data can be dumped to file using the JFR.dump command:");
+            System.out.println();
+            System.out.println(" jcmd <pid> JFR.dump filename=recording.jfr");
+            System.out.println();
+            System.out.println("The contents of the recording can then be printed, for example:");
+            System.out.println();
+            System.out.println(" jfr print recording.jfr");
+            System.out.println();
+            System.out.println(" jfr print --events CPULoad,GarbageCollection recording.jfr");
+            System.out.println();
+            System.out.println(" jfr print --json --events CPULoad recording.jfr");
+            System.out.println();
+            System.out.println(" jfr print --categories \"GC,JVM,Java*\" recording.jfr");
+            System.out.println();
+            System.out.println(" jfr print --events \"jdk.*\" --stack-depth 64 recording.jfr");
+            System.out.println();
+            System.out.println(" jfr summary recording.jfr");
+            System.out.println();
+            System.out.println(" jfr metadata recording.jfr");
+            System.out.println();
+            System.out.println("For more information about available commands, use 'jfr help'");
+            System.exit(EXIT_OK);
+        }
+        String command = argList.remove();
+        for (Command c : Command.getCommands()) {
+            if (c.matches(command)) {
+                try {
+                    c.execute(argList);
+                    System.exit(EXIT_OK);
+                } catch (UserDataException ude) {
+                    System.err.println("jfr " + c.getName() + ": " + ude.getMessage());
+                    System.exit(EXIT_FAILED);
+                } catch (UserSyntaxException use) {
+                    System.err.println("jfr " + c.getName() + ": " + use.getMessage());
+                    System.err.println();
+                    System.err.println("Usage:");
+                    System.err.println();
+                    c.displayUsage(System.err);
+                    System.exit(EXIT_WRONG_ARGUMENTS);
+                } catch (Throwable e) {
+                    System.err.println("jfr " + c.getName() + ": unexpected internal error, " + e.getMessage());
+                    e.printStackTrace();
+                    System.exit(EXIT_FAILED);
+                }
+            }
+        }
+        System.err.println("jfr: unknown command '" + command + "'");
+        System.err.println();
+        System.err.println("List of available commands:");
+        System.err.println();
+        Command.displayAvailableCommands(System.err);
+        System.exit(EXIT_WRONG_ARGUMENTS);
+    }
+}