--- /dev/null	Wed Oct 20 09:31:16 2010
+++ new/make/tools/classanalyzer/src/com/sun/classanalyzer/ShowRefs.java	Wed Oct 20 09:31:16 2010
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2010, 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.
+ */
+
+package com.sun.classanalyzer;
+
+import java.io.IOException;
+import java.util.*;
+
+/**
+ * A simple tool to print out the reverse dependencies.
+ */
+public class ShowRefs {
+
+    static void usage() {
+        System.out.println("java ShowRefs -classpath <paths> classname ....");
+        System.out.println("Example usages:");
+        System.out.println("  java ShowRefs -classpath Foo.jar com.foo.Foo");
+        System.out.println("  java ShowRefs sun.misc.VM");
+        System.exit(-1);
+    }
+
+    public static void main(String[] args) throws IOException {
+        String cps = null;
+        List<String> classnames = new ArrayList<String>();
+
+        int i = 0;
+        while (i < args.length) {
+            String arg = args[i++];
+            if (arg.equals("-classpath")) {
+                if (i == args.length) {
+                    System.err.println("Invalid option -classpath");
+                    usage();
+                }
+
+                cps = args[i++];
+            } else {
+                classnames.add(arg);
+            }
+        }
+
+        ClassPaths cpaths = cps == null ?
+            ClassPaths.newJDKClassPaths(System.getProperty("java.home")) :
+            ClassPaths.newInstance(cps);
+        cpaths.parse();
+
+        for (String c : classnames) {
+            Klass k = Klass.findKlass(c);
+            if (k == null) {
+                System.err.println(c + " not found");
+            } else {
+                showRefs(k);
+            }
+        }
+    }
+
+    static void showRefs(Klass k) {
+        System.out.format("References to %s:%n", k.getClassName());
+        for (Klass ref : k.getReferencingClasses()) {
+            System.out.format("  <- %s%n", ref.getClassName());
+        }
+        System.out.println();
+    }
+
+}