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/* VirtualMachineCommandSet.java -- class to implement the VirtualMachine

   Command Set

   Copyright (C) 2005, 2006, 2007 Free Software Foundation

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath 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 for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package gnu.classpath.jdwp.processor;

import gnu.classpath.jdwp.JdwpConstants;

import gnu.classpath.jdwp.VMFrame;

import gnu.classpath.jdwp.VMVirtualMachine;

import gnu.classpath.jdwp.exception.JdwpException;

import gnu.classpath.jdwp.exception.JdwpInternalErrorException;

import gnu.classpath.jdwp.exception.NotImplementedException;

import gnu.classpath.jdwp.id.ObjectId;

import gnu.classpath.jdwp.id.ReferenceTypeId;

import gnu.classpath.jdwp.util.JdwpString;

import gnu.classpath.jdwp.util.Signature;

import java.io.DataOutputStream;

import java.io.IOException;

import java.nio.ByteBuffer;

import java.util.ArrayList;

import java.util.Collection;

import java.util.Iterator;

import java.util.Properties;

/**

 * A class representing the VirtualMachine Command Set.

 *

 * @author Aaron Luchko <aluchko@redhat.com>

 */

public class VirtualMachineCommandSet

  extends CommandSet

{

  public boolean runCommand(ByteBuffer bb, DataOutputStream os, byte command)

    throws JdwpException

  {

    boolean shutdown = false;

    try

      {

        switch (command)

          {

          case JdwpConstants.CommandSet.VirtualMachine.VERSION:

            executeVersion(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.CLASSES_BY_SIGNATURE:

            executeClassesBySignature(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.ALL_CLASSES:

            executeAllClasses(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.ALL_THREADS:

            executeAllThreads(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.TOP_LEVEL_THREAD_GROUPS:

            executeTopLevelThreadGroups(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.IDSIZES:

            executeIDsizes(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.DISPOSE:

            shutdown = true;

            executeDispose(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.SUSPEND:

            executeSuspend(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.RESUME:

            executeResume(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.EXIT:

            shutdown = true;

            executeExit(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.CREATE_STRING:

            executeCreateString(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.CAPABILITIES:

            executeCapabilities(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.CLASS_PATHS:

            executeClassPaths(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.DISPOSE_OBJECTS:

            executeDisposeObjects(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.HOLD_EVENTS:

            executeHoldEvents(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.RELEASE_EVENTS:

            executeReleaseEvents(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.CAPABILITIES_NEW:

            executeCapabilitiesNew(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.REDEFINE_CLASSES:

            executeRedefineClasses(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.SET_DEFAULT_STRATUM:

            executeSetDefaultStratum(bb, os);

            break;

          case JdwpConstants.CommandSet.VirtualMachine.ALL_CLASSES_WITH_GENERIC:

            executeAllClassesWithGeneric(bb, os);

            break;

          default:

            throw new NotImplementedException("Command " + command +

            " not found in VirtualMachine Command Set.");

          }

      }

    catch (IOException ex)

      {

        // The DataOutputStream we're using isn't talking to a socket at all

        // So if we throw an IOException we're in serious trouble

        throw new JdwpInternalErrorException(ex);

      }

    return shutdown;

  }

  private void executeVersion(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    Properties props = System.getProperties();

    int jdwpMajor = JdwpConstants.Version.MAJOR;

    int jdwpMinor = JdwpConstants.Version.MINOR;

    // The description field is pretty loosely defined

    String description = "JDWP version " + jdwpMajor + "." + jdwpMinor

                         + ", JVM version " + props.getProperty("java.vm.name")

                         + " " + props.getProperty("java.vm.version") + " "

                         + props.getProperty("java.version");

    String vmVersion = props.getProperty("java.version");

    String vmName = props.getProperty("java.vm.name");

    JdwpString.writeString(os, description);

    os.writeInt(jdwpMajor);

    os.writeInt(jdwpMinor);

    JdwpString.writeString(os, vmName);

    JdwpString.writeString(os, vmVersion);

  }

  private void executeClassesBySignature(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    String sig = JdwpString.readString(bb);

    ArrayList allMatchingClasses = new ArrayList();

    // This will be an Iterator over all loaded Classes

    Collection classes = VMVirtualMachine.getAllLoadedClasses();

    Iterator iter = classes.iterator ();

    while (iter.hasNext())

      {

        Class clazz = (Class) iter.next();

        String clazzSig = Signature.computeClassSignature(clazz);

        if (clazzSig.equals(sig))

          allMatchingClasses.add(clazz);

      }

    os.writeInt(allMatchingClasses.size());

    for (int i = 0; i < allMatchingClasses.size(); i++)

      {

        Class clazz = (Class) allMatchingClasses.get(i);

        ReferenceTypeId id = idMan.getReferenceTypeId(clazz);

        id.writeTagged(os);

        int status = VMVirtualMachine.getClassStatus(clazz);

        os.writeInt(status);

      }

  }

  private void executeAllClasses(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    Collection classes = VMVirtualMachine.getAllLoadedClasses();

    os.writeInt(classes.size ());

    Iterator iter = classes.iterator ();

    while (iter.hasNext())

      {

        Class clazz = (Class) iter.next();

        ReferenceTypeId id = idMan.getReferenceTypeId(clazz);

        id.writeTagged(os);

        String sig = Signature.computeClassSignature(clazz);

        JdwpString.writeString(os, sig);

        int status = VMVirtualMachine.getClassStatus(clazz);

        os.writeInt(status);

      }

  }

  private void executeAllThreads(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ThreadGroup jdwpGroup = Thread.currentThread().getThreadGroup();

    ThreadGroup root = getRootThreadGroup(jdwpGroup);

    int numThreads = root.activeCount();

    Thread allThreads[] = new Thread[numThreads];

    root.enumerate(allThreads);

    // We need to loop through for the true count since some threads may have

    // been destroyed since we got

    // activeCount so those spots in the array will be null. As well we must

    // ignore any threads that belong to jdwp

    numThreads = 0;

    for (int i = 0; i < allThreads.length; i++)

      {

        Thread thread = allThreads[i];

        if (thread == null)

          break; // No threads after this point

        if (!thread.getThreadGroup().equals(jdwpGroup))

          numThreads++;

      }

    os.writeInt(numThreads);

    for (int i = 0; i < allThreads.length; i++)

      {

        Thread thread = allThreads[i];

        if (thread == null)

          break; // No threads after this point

        if (!thread.getThreadGroup().equals(jdwpGroup))

          idMan.getObjectId(thread).write(os);

      }

  }

  private void executeTopLevelThreadGroups(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ThreadGroup jdwpGroup = Thread.currentThread().getThreadGroup ();

    ThreadGroup root = getRootThreadGroup(jdwpGroup);

    os.writeInt(1); // Just one top level group allowed?

    idMan.getObjectId(root).write(os);

  }

  private void executeDispose(ByteBuffer bb, DataOutputStream os)

    throws JdwpException

  {

    // resumeAllThreads isn't sufficient as a thread may have been

    // suspended multiple times, we likely need a way to keep track of how many

    // times a thread has been suspended or else a stronger resume method for

    // this purpose

    // VMVirtualMachine.resumeAllThreads ();

    // Simply shutting down the jdwp layer will take care of the rest of the

    // shutdown other than disabling debugging in the VM

    // VMVirtualMachine.disableDebugging();

    // Don't implement this until we're sure how to remove all the debugging

    // effects from the VM.

    throw new NotImplementedException(

      "Command VirtualMachine.Dispose not implemented");

  }

  private void executeIDsizes(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    os.writeInt(ObjectId.SIZE); // fieldId FIXME

    os.writeInt(ObjectId.SIZE); // methodId FIXME

    os.writeInt(ObjectId.SIZE); // objectId

    os.writeInt(ReferenceTypeId.SIZE); // referenceTypeId

    os.writeInt(VMFrame.SIZE); // frameId

  }

  private void executeSuspend(ByteBuffer bb, DataOutputStream os)

    throws JdwpException

  {

    VMVirtualMachine.suspendAllThreads ();

  }

  private void executeResume(ByteBuffer bb, DataOutputStream os)

    throws JdwpException

  {

    VMVirtualMachine.resumeAllThreads ();

  }

  private void executeExit(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    int exitCode = bb.getInt();

    System.exit (exitCode);

  }

  private void executeCreateString(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    String string = JdwpString.readString(bb);

    ObjectId stringId = idMan.getObjectId(string);

    // Since this string isn't referenced anywhere we'll disable garbage

    // collection on it so it's still around when the debugger gets back to it.

    stringId.disableCollection();

    stringId.write(os);

  }

  private void executeCapabilities(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    os.writeBoolean(VMVirtualMachine.canWatchFieldModification);

    os.writeBoolean(VMVirtualMachine.canWatchFieldAccess);

    os.writeBoolean(VMVirtualMachine.canGetBytecodes);

    os.writeBoolean(VMVirtualMachine.canGetSyntheticAttribute);

    os.writeBoolean(VMVirtualMachine.canGetOwnedMonitorInfo);

    os.writeBoolean(VMVirtualMachine.canGetCurrentContendedMonitor);

    os.writeBoolean(VMVirtualMachine.canGetMonitorInfo);

  }

  private void executeClassPaths(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    String baseDir = System.getProperty("user.dir");

    JdwpString.writeString(os, baseDir);

    // Find and write the classpath

    String classPath = System.getProperty("java.class.path");

    String[] paths = classPath.split(":");

    os.writeInt(paths.length);

    for (int i = 0; i < paths.length; i++)

      JdwpString.writeString(os, paths[i]);

    // Now the bootpath

    String bootPath = System.getProperty("sun.boot.class.path");

    paths = bootPath.split(":");

    os.writeInt(paths.length);

    for (int i = 0; i < paths.length; i++)

      JdwpString.writeString(os, paths[i]);

  }

  private void executeDisposeObjects(ByteBuffer bb, DataOutputStream os)

    throws JdwpException

  {

    // Instead of going through the list of objects they give us it's probably

    // better just to find the garbage collected objects ourselves

    //idMan.update();

  }

  private void executeHoldEvents(ByteBuffer bb, DataOutputStream os)

    throws JdwpException

  {

    // Going to have to implement a send queue somewhere and do this without

    // triggering events

    // Until then just don't implement

    throw new NotImplementedException(

      "Command VirtualMachine.HoldEvents not implemented");

  }

  // Opposite of executeHoldEvents

  private void executeReleaseEvents(ByteBuffer bb, DataOutputStream os)

    throws JdwpException

  {

    throw new NotImplementedException(

      "Command VirtualMachine.ReleaseEvents not implemented");

  }

  private void executeCapabilitiesNew(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    final int CAPABILITIES_NEW_SIZE = 32;

    executeCapabilities(bb, os);

    os.writeBoolean(VMVirtualMachine.canRedefineClasses);

    os.writeBoolean(VMVirtualMachine.canAddMethod);

    os.writeBoolean(VMVirtualMachine.canUnrestrictedlyRedefineClasses);

    os.writeBoolean(VMVirtualMachine.canPopFrames);

    os.writeBoolean(VMVirtualMachine.canUseInstanceFilters);

    os.writeBoolean(VMVirtualMachine.canGetSourceDebugExtension);

    os.writeBoolean(VMVirtualMachine.canRequestVMDeathEvent);

    os.writeBoolean(VMVirtualMachine.canSetDefaultStratum);

    for (int i = 15; i < CAPABILITIES_NEW_SIZE; i++)

      {

        // Future capabilities (currently unused)

        os.writeBoolean(false);

      }

  }

  private void executeRedefineClasses(ByteBuffer bb, DataOutputStream os)

    throws JdwpException

  {

    if (!VMVirtualMachine.canRedefineClasses)

      {

        String msg = "redefinition of classes is not supported";

        throw new NotImplementedException(msg);

      }

    int classes = bb.getInt();

    Class[] types = new Class[classes];

    byte[][] bytecodes = new byte[classes][];

    for (int i = 0; i < classes; ++i)

      {

        ReferenceTypeId id = idMan.readReferenceTypeId(bb);

        int classfile = bb.getInt();

        byte[] bytecode = new byte[classfile];

        bb.get(bytecode);

        types[i] = id.getType();

        bytecodes[i] = bytecode;

      }

    VMVirtualMachine.redefineClasses (types, bytecodes);

  }

  private void executeSetDefaultStratum(ByteBuffer bb, DataOutputStream os)

    throws JdwpException

  {

    if (!VMVirtualMachine.canSetDefaultStratum)

      {

        String msg = "setting the default stratum is not supported";

        throw new NotImplementedException(msg);

      }

    String stratum = JdwpString.readString(bb);

    VMVirtualMachine.setDefaultStratum(stratum);

  }

  private void executeAllClassesWithGeneric(ByteBuffer bb, DataOutputStream os)

    throws JdwpException

  {

    // We don't handle generics

    throw new NotImplementedException(

      "Command VirtualMachine.AllClassesWithGeneric not implemented");

  }

  /**

   * Find the root ThreadGroup of this ThreadGroup

   */

  private ThreadGroup getRootThreadGroup(ThreadGroup group)

  {

    ThreadGroup parent = group.getParent();

    while (parent != null)

      {

        group = parent;

        parent = group.getParent();

      }

    return group; // This group was the root

  }

}