--- /dev/null	2020-01-02 04:43:18.583999853 +0000
+++ new/src/share/classes/jdk/jfr/internal/tool/Metadata.java	2020-01-30 06:27:48.441169316 +0000
@@ -0,0 +1,139 @@
+/*
+ * 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.  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.io.IOException;
+import java.io.PrintWriter;
+import java.nio.file.Path;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.Deque;
+import java.util.List;
+
+import jdk.jfr.consumer.RecordingFile;
+import jdk.jfr.internal.Type;
+import jdk.jfr.internal.consumer.RecordingInternals;
+
+final class Metadata extends Command {
+
+    private static class TypeComparator implements Comparator<Type> {
+
+        @Override
+        public int compare(Type t1, Type t2) {
+            int g1 = groupValue(t1);
+            int g2 = groupValue(t2);
+            if (g1 == g2) {
+                String n1 = t1.getName();
+                String n2 = t2.getName();
+                String package1 = n1.substring(0, n1.lastIndexOf('.') + 1);
+                String package2 = n2.substring(0, n2.lastIndexOf('.') + 1);
+
+                if (package1.equals(package2)) {
+                    return n1.compareTo(n2);
+                } else {
+                    // Ensure that jdk.* are printed first
+                    // This makes it easier to find user defined events at the end.
+                    if (Type.SUPER_TYPE_EVENT.equals(t1.getSuperType()) && !package1.equals(package2)) {
+                        if (package1.equals("jdk.jfr")) {
+                            return -1;
+                        }
+                        if (package2.equals("jdk.jfr")) {
+                            return 1;
+                        }
+                    }
+                    return package1.compareTo(package2);
+                }
+            } else {
+                return Integer.compare(groupValue(t1), groupValue(t2));
+            }
+        }
+
+        int groupValue(Type t) {
+            String superType = t.getSuperType();
+            if (superType == null) {
+                return 1;
+            }
+            if (Type.SUPER_TYPE_ANNOTATION.equals(superType)) {
+                return 3;
+            }
+            if (Type.SUPER_TYPE_SETTING.equals(superType)) {
+                return 4;
+            }
+            if (Type.SUPER_TYPE_EVENT.equals(superType)) {
+                return 5;
+            }
+            return 2; // reserved for enums in the future
+        }
+    }
+
+    @Override
+    public String getName() {
+        return "metadata";
+    }
+
+    @Override
+    public List<String> getOptionSyntax() {
+        return Collections.singletonList("<file>");
+    }
+
+    @Override
+    public String getDescription() {
+        return "Display event metadata, such as labels, descriptions and field layout";
+    }
+
+    @Override
+    public void execute(Deque<String> options) throws UserSyntaxException, UserDataException {
+        Path file = getJFRInputFile(options);
+
+        boolean showIds = false;
+        int optionCount = options.size();
+        while (optionCount > 0) {
+            if (acceptOption(options, "--ids")) {
+                showIds = true;
+            }
+            if (optionCount == options.size()) {
+                // No progress made
+                throw new UserSyntaxException("unknown option " + options.peek());
+            }
+            optionCount = options.size();
+        }
+
+        try (PrintWriter pw = new PrintWriter(System.out)) {
+            PrettyWriter prettyWriter = new PrettyWriter(pw);
+            prettyWriter.setShowIds(showIds);
+            try (RecordingFile rf = new RecordingFile(file)) {
+                List<Type> types = RecordingInternals.INSTANCE.readTypes(rf);
+                Collections.sort(types, new TypeComparator());
+                for (Type type : types) {
+                    prettyWriter.printType(type);
+                }
+                prettyWriter.flush(true);
+            } catch (IOException ioe) {
+                couldNotReadError(file, ioe);
+            }
+        }
+    }
+}