virtualmachinecommandset.java

gcc的组建

/* VirtualMachineCommandSet.java -- class to implement the VirtualMachine
   Command Set
   Copyright (C) 2005 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.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.Iterator;
import java.util.Properties;

/**
 * A class representing the VirtualMachine Command Set.
 * 
 * @author Aaron Luchko <[e-mail]>
 */
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
    Iterator iter = VMVirtualMachine.getAllLoadedClasses();

    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
  {
    // Disable garbage collection while we're collecting the info on loaded
    // classes so we some classes don't get collected between the time we get
    // the count and the time we get the list
    //VMVirtualMachine.disableGarbageCollection();

    int classCount = VMVirtualMachine.getAllLoadedClassesCount();
    os.writeInt(classCount);

    // This will be an Iterator over all loaded Classes
    Iterator iter = VMVirtualMachine.getAllLoadedClasses();
    //VMVirtualMachine.enableGarbageCollection();
    int count = 0;

    // Note it's possible classes were created since out classCount so make
    // sure we don't write more classes than we told the debugger
    while (iter.hasNext() && count++ < classCount)
      {
        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