/*

 * Copyright (c) 2000, 2011, 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 sun.jvm.hotspot;

import sun.jvm.hotspot.debugger.*;

import sun.jvm.hotspot.runtime.*;

import sun.jvm.hotspot.oops.*;

public class DebugServer {

  private void usage() {

    System.out.println("usage: java " + getClass().getName() + " <pid> [server id]");

    System.out.println("   or: java " + getClass().getName() + " <executable> <core> [server id]");

    System.out.println("\"pid\" must be the process ID of a HotSpot process.");

    System.out.println("If reading a core file, \"executable\" must (currently) be the");

    System.out.println("full path name to the precise java executable which generated");

    System.out.println("the core file (not, on Solaris, the \"java\" wrapper script in");

    System.out.println("the \"bin\" subdirectory of the JDK.)");

    System.out.println("The \"server id\" is a unique name for a specific remote debuggee.");

    System.exit(1);

  }

  public static void main(String[] args) {

    new DebugServer().run(args);

  }

  private void run(String[] args) {

    if ((args.length < 1) || (args.length > 3)) {

      usage();

    }

    // Attempt to handle "-h" or "-help"

    if (args[0].startsWith("-")) {

      usage();

    }

    int pid = 0;

    boolean usePid = false;

    String coreFileName = null;

    // FIXME: would be nice to pick this up from the core file

    // somehow, but that doesn't look possible. Should at least figure

    // it out from a path to the JDK.

    String javaExecutableName = null;

    String serverID = null;

    switch (args.length) {

       case 1:

         try {

           pid = Integer.parseInt(args[0]);

           usePid = true;

         } catch (NumberFormatException e) {

           usage();

         }

         break;

       case 2:

         // either we have pid and server id or exec file and core file

         try {

           pid = Integer.parseInt(args[0]);

           usePid = true;

           serverID = args[1];

         } catch (NumberFormatException e) {

           pid = -1;

           usePid = false;

           javaExecutableName = args[0];

           coreFileName = args[1];

         }

         break;

       case 3:

         javaExecutableName = args[0];

         coreFileName = args[1];

         serverID = args[2];

         break;

       default:

         // should not happend, taken care already.

         break;

    }

    final HotSpotAgent agent = new HotSpotAgent();

    try {

      if (usePid) {

        System.err.println("Attaching to process ID " + pid + " and starting RMI services, please wait...");

        agent.startServer(pid, serverID);

      } else {

        System.err.println("Attaching to core " + coreFileName +

                           " from executable " + javaExecutableName + " and starting RMI services, please wait...");

        agent.startServer(javaExecutableName, coreFileName, serverID);

      }

    }

    catch (DebuggerException e) {

      if (usePid) {

        System.err.print("Error attaching to process or starting server: ");

      } else {

        System.err.print("Error attaching to core file or starting server: ");

      }

      e.printStackTrace();

      System.exit(1);

    }

    // shutdown hook to clean-up the server in case of forced exit.

    Runtime.getRuntime().addShutdownHook(new java.lang.Thread(

                          new Runnable() {

                             public void run() {

                                agent.shutdownServer();

                             }

                          }));

    System.err.println("Debugger attached and RMI services started.");

  }

}