--- a/src/share/classes/com/sun/tools/javap/ClassWriter.java	Mon Aug 04 15:09:02 2008 -0700
+++ b/src/share/classes/com/sun/tools/javap/ClassWriter.java	Mon Aug 04 17:54:15 2008 -0700
@@ -25,6 +25,7 @@
 
 package com.sun.tools.javap;
 
+import java.net.URI;
 import java.util.Collection;
 import java.util.List;
 
@@ -46,6 +47,8 @@
 import com.sun.tools.classfile.SourceFile_attribute;
 import com.sun.tools.classfile.Type;
 
+import java.text.DateFormat;
+import java.util.Date;
 import static com.sun.tools.classfile.AccessFlags.*;
 
 /*
@@ -73,6 +76,23 @@
         constantWriter = ConstantWriter.instance(context);
     }
 
+    void setDigest(String name, byte[] digest) {
+        this.digestName = name;
+        this.digest = digest;
+    }
+
+    void setFile(URI uri) {
+        this.uri = uri;
+    }
+
+    void setFileSize(int size) {
+        this.size = size;
+    }
+
+    void setLastModified(long lastModified) {
+        this.lastModified = lastModified;
+    }
+
     ClassFile getClassFile() {
         return classFile;
     }
@@ -85,6 +105,32 @@
         classFile = cf;
         constant_pool = classFile.constant_pool;
 
+        if ((options.sysInfo || options.verbose) && !options.compat) {
+            if (uri != null) {
+                if (uri.getScheme().equals("file"))
+                    println("Classfile " + uri.getPath());
+                else
+                    println("Classfile " + uri);
+            }
+            if (lastModified != -1) {
+                Date lm = new Date(lastModified);
+                DateFormat df = DateFormat.getDateInstance();
+                if (size > 0) {
+                    println("Last modified " + df.format(lm) + "; size " + size + " bytes");
+                } else {
+                    println("Last modified " + df.format(lm));
+                }
+            } else if (size > 0) {
+                println("Size " + size + " bytes");
+            }
+            if (digestName != null && digest != null) {
+                StringBuilder sb = new StringBuilder();
+                for (byte b: digest)
+                    sb.append(String.format("%02x", b));
+                println(digestName + " checksum " + sb);
+            }
+        }
+
         Attribute sfa = cf.getAttribute(Attribute.SourceFile);
         if (sfa instanceof SourceFile_attribute) {
             println("Compiled from \"" + getSourceFile((SourceFile_attribute) sfa) + "\"");
@@ -574,6 +620,11 @@
     private CodeWriter codeWriter;
     private ConstantWriter constantWriter;
     private ClassFile classFile;
+    private URI uri;
+    private long lastModified;
+    private String digestName;
+    private byte[] digest;
+    private int size;
     private ConstantPool constant_pool;
     private Method method;
     private static final String NEWLINE = System.getProperty("line.separator", "\n");

--- a/src/share/classes/com/sun/tools/javap/JavapTask.java	Mon Aug 04 15:09:02 2008 -0700
+++ b/src/share/classes/com/sun/tools/javap/JavapTask.java	Mon Aug 04 17:54:15 2008 -0700
@@ -27,11 +27,15 @@
 
 import java.io.EOFException;
 import java.io.FileNotFoundException;
+import java.io.FilterInputStream;
+import java.io.InputStream;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.io.Writer;
+import java.security.DigestInputStream;
+import java.security.MessageDigest;
 import java.text.MessageFormat;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -192,6 +196,12 @@
             }
         },
 
+        new Option(false, "-sysinfo") {
+            void process(JavapTask task, String opt, String arg) {
+                task.options.sysInfo = true;
+            }
+        },
+
         new Option(false, "-Xold") {
             void process(JavapTask task, String opt, String arg) throws BadArgs {
                 // -Xold is only supported as first arg when invoked from
@@ -457,8 +467,27 @@
                 Attribute.Factory attributeFactory = new Attribute.Factory();
                 attributeFactory.setCompat(options.compat);
                 attributeFactory.setJSR277(options.jsr277);
-                ClassFile cf = ClassFile.read(fo.openInputStream(), attributeFactory);
+
+                InputStream in = fo.openInputStream();
+                SizeInputStream sizeIn = null;
+                MessageDigest md  = null;
+                if (options.sysInfo || options.verbose) {
+                    md = MessageDigest.getInstance("MD5");
+                    in = new DigestInputStream(in, md);
+                    in = sizeIn = new SizeInputStream(in);
+                }
+
+                ClassFile cf = ClassFile.read(in, attributeFactory);
+
+                if (options.sysInfo || options.verbose) {
+                    classWriter.setFile(fo.toUri());
+                    classWriter.setLastModified(fo.getLastModified());
+                    classWriter.setDigest("MD5", md.digest());
+                    classWriter.setFileSize(sizeIn.size());
+                }
+
                 classWriter.write(cf);
+
             } catch (ConstantPoolException e) {
                 diagnosticListener.report(createDiagnostic("err.bad.constant.pool", className, e.getLocalizedMessage()));
                 ok = false;
@@ -628,4 +657,31 @@
     Map<Locale, ResourceBundle> bundles;
 
     private static final String progname = "javap";
+
+    private static class SizeInputStream extends FilterInputStream {
+        SizeInputStream(InputStream in) {
+            super(in);
+        }
+
+        int size() {
+            return size;
+        }
+
+        @Override
+        public int read(byte[] buf, int offset, int length) throws IOException {
+            int n = super.read(buf, offset, length);
+            if (n > 0)
+                size += n;
+            return n;
+        }
+
+        @Override
+        public int read() throws IOException {
+            int b = super.read();
+            size += 1;
+            return b;
+        }
+
+        private int size;
+    }
 }

--- a/src/share/classes/com/sun/tools/javap/Options.java	Mon Aug 04 15:09:02 2008 -0700
+++ b/src/share/classes/com/sun/tools/javap/Options.java	Mon Aug 04 17:54:15 2008 -0700
@@ -78,6 +78,7 @@
     public boolean showInternalSignatures;
     public boolean showAllAttrs;
     public boolean showConstants;
+    public boolean sysInfo;
 
     public boolean compat;             // bug-for-bug compatibility mode with old javap
     public boolean jsr277;

--- a/src/share/classes/com/sun/tools/javap/resources/javap.properties	Mon Aug 04 15:09:02 2008 -0700
+++ b/src/share/classes/com/sun/tools/javap/resources/javap.properties	Mon Aug 04 17:54:15 2008 -0700
@@ -62,5 +62,6 @@
 \  -constants               Show static final constants
 
 
-
-
+main.opt.sysinfo=\
+\  -sysinfo                 Show system info (path, size, date, MD5 hash)\n\
+\                           of class being processed

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/tools/javap/T4884240.java	Mon Aug 04 17:54:15 2008 -0700
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2008 Sun Microsystems, Inc.  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.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun 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 02110-15301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug 4884240
+ * @summary additional option required for javap
+ */
+
+import java.io.*;
+
+public class T4884240 {
+    public static void main(String... args) throws Exception {
+        new T4884240().run();
+    }
+
+    public void run() throws Exception {
+        StringWriter sw = new StringWriter();
+        PrintWriter pw = new PrintWriter(sw);
+        String[] args = { "-sysinfo", "java.lang.Object" };
+        int rc = com.sun.tools.javap.Main.run(args, pw);
+        if (rc != 0)
+            throw new Exception("unexpected return code: " + rc);
+        pw.close();
+        String[] lines = sw.toString().split("\n");
+        if (lines.length < 3
+            || !lines[0].startsWith("Classfile")
+            || !lines[1].startsWith("Last modified")
+            || !lines[2].startsWith("MD5")) {
+            System.out.println(sw);
+            throw new Exception("unexpected output");
+        }
+    }
+}

--- a/test/tools/javap/T6622260.java	Mon Aug 04 15:09:02 2008 -0700
+++ b/test/tools/javap/T6622260.java	Mon Aug 04 17:54:15 2008 -0700
@@ -189,6 +189,10 @@
 
     void verify(String output) {
         System.out.println(output);
+        if (output.startsWith("Classfile")) {
+            // make sure to ignore filename
+            output = output.substring(output.indexOf('\n'));
+        }
         if (output.indexOf("-") >= 0)
             throw new Error("- found in output");
         if (output.indexOf("FFFFFF") >= 0)