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jlechner |
/* VMVirtualMachine.java -- A reference implementation of a JDWP virtual
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machine
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Copyright (C) 2005 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.classpath.jdwp;
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import gnu.classpath.jdwp.event.EventRequest;
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import gnu.classpath.jdwp.exception.InvalidClassException;
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import gnu.classpath.jdwp.exception.InvalidObjectException;
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import gnu.classpath.jdwp.id.ObjectId;
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import gnu.classpath.jdwp.id.ReferenceTypeId;
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import gnu.classpath.jdwp.util.LineTable;
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import gnu.classpath.jdwp.util.MethodResult;
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import gnu.classpath.jdwp.util.VariableTable;
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import java.io.IOException;
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import java.lang.reflect.Method;
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import java.nio.ByteBuffer;
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import java.util.ArrayList;
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import java.util.Iterator;
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/**
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* A virtual machine according to JDWP.
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*
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* @author Keith Seitz <keiths@redhat.com>
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*/
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public class VMVirtualMachine
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{
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/**
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* Suspend a thread
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*
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* @param thread the thread to suspend
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*/
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public static void suspendThread (Thread thread) { }
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/**
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* Suspend all threads
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*/
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public static void suspendAllThreads ()
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{
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// Our JDWP thread group -- don't suspend any of those threads
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Thread current = Thread.currentThread ();
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ThreadGroup jdwpGroup = current.getThreadGroup ();
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// Find the root ThreadGroup
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ThreadGroup group = jdwpGroup;
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ThreadGroup parent = group.getParent ();
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while (parent != null)
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{
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group = parent;
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parent = group.getParent ();
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}
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// Get all the threads in the system
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int num = group.activeCount ();
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Thread[] threads = new Thread[num];
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group.enumerate (threads);
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for (int i = 0; i < num; ++i)
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{
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Thread t = threads[i];
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if (t != null)
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{
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if (t.getThreadGroup () == jdwpGroup || t == current)
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{
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// Don't suspend the current thread or any JDWP thread
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continue;
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}
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else
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suspendThread (t);
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}
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}
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// Now suspend the current thread
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suspendThread (current);
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}
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/**
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* Resume a thread. A thread must be resumed as many times
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* as it has been suspended.
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*
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* @param thread the thread to resume
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*/
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public static void resumeThread (Thread thread) { }
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/**
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* Resume all threads. This simply decrements the thread's
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* suspend count. It can not be used to force the application
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* to run.
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*/
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public static void resumeAllThreads ()
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{
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// Our JDWP thread group -- don't resume
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Thread current = Thread.currentThread ();
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ThreadGroup jdwpGroup = current.getThreadGroup ();
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// Find the root ThreadGroup
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ThreadGroup group = jdwpGroup;
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ThreadGroup parent = group.getParent ();
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while (parent != null)
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{
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group = parent;
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parent = group.getParent ();
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}
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// Get all the threads in the system
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int num = group.activeCount ();
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Thread[] threads = new Thread[num];
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group.enumerate (threads);
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for (int i = 0; i < num; ++i)
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{
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Thread t = threads[i];
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if (t != null)
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{
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if (t.getThreadGroup () == jdwpGroup || t == current)
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{
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// Don't resume the current thread or any JDWP thread
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continue;
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}
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else
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resumeThread (t);
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}
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}
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}
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/**
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* Get the suspend count for a give thread
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*
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* @param thread the thread whose suspend count is desired
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* @return the number of times the thread has been suspended
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*/
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public static int getSuspendCount (Thread thread) { return -1; }
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/**
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* Returns a count of the number of loaded classes in the VM
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*/
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public static int getAllLoadedClassesCount () { return -1; }
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/**
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* Returns an iterator over all the loaded classes in the VM
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*/
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public static Iterator getAllLoadedClasses () { return null; }
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/**
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* Returns the status of the given class
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*
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* @param clazz the class whose status is desired
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* @return a flag containing the class's status
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* @see JdwpConstants.ClassStatus
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*/
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public static int getClassStatus (Class clazz) { return -1; }
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/**
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* Returns the thread's call stack
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*
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* @param thread thread for which to get call stack
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* @param start index of first frame to return
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* @param length number of frames to return (-1 for all frames)
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* @return a list of frames
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*/
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public static ArrayList getFrames (Thread thread, int strart,
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int length)
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{ return null; }
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/**
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* Returns the frame for a given thread with the frame ID in
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* the buffer
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*
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* I don't like this.
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*
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* @param thread the frame's thread
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* @param bb buffer containing the frame's ID
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* @return the desired frame
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*/
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public static VMFrame getFrame (Thread thread, ByteBuffer bb)
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{ return null; }
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/**
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* Returns the number of frames in the thread's stack
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*
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* @param thread the thread for which to get a frame count
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* @return the number of frames in the thread's stack
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*/
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public static int getFrameCount (Thread thread)
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{ return -1; }
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/**
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* Returns the status of a thread
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*
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* @param thread the thread for which to get status
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* @return integer status of the thread
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* @see JdwpConstants.ThreadStatus
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*/
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public static int getThreadStatus (Thread thread)
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{ return -1; }
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/**
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* Returns a list of all classes which this class loader has been
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* requested to load
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*
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* @param cl the class loader
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* @return a list of all visible classes
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*/
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public static ArrayList getLoadRequests (ClassLoader cl)
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{ return null; }
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/**
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* Executes a method in the virtual machine
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*
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* @param obj instance in which to invoke method (null for static)
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* @param thread the thread in which to invoke the method
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* @param clazz the class in which the method is defined
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* @param method the method to invoke
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* @param values arguments to pass to method
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* @param nonVirtual "otherwise, normal virtual invoke
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* (instance methods only) "
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* @return a result object containing the results of the invocation
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*/
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public static MethodResult executeMethod (Object obj, Thread thread,
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Class clazz, Method method,
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Object[] values,
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boolean nonVirtual)
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{ return null; }
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/**
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* "Returns variable information for the method. The variable table
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* includes arguments and locals declared within the method. For instance
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* methods, the "this" reference is included in the table. Also, synthetic
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* variables may be present."
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*
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* @param clazz the class in which the method is defined
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* @param method the method for which variable information is desired
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* @return a result object containing the information
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*/
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public static VariableTable getVarTable (Class clazz, Method method)
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{ return null; }
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/**
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* "Returns line number information for the method, if present. The line
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* table maps source line numbers to the initial code index of the line.
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* The line table is ordered by code index (from lowest to highest). The
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* line number information is constant unless a new class definition is
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* installed using RedefineClasses."
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*
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* @param clazz the class in which the method is defined
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* @param method the method whose line table is desired
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* @return a result object containing the line table
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*/
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public static LineTable getLineTable (Class clazz, Method method)
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{ return null; }
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/**
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* "Returns the name of source file in which a reference type was declared"
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*
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* @param clazz the class for which to return a source file
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* @return a string containing the source file name; "no path information
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* for the file is included"
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*/
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public static String getSourceFile (Class clazz)
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{ return null; }
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/**
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* Register a request from the debugger
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*
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* Virtual machines have two options. Either do nothing and allow
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* the event manager to take care of the request (useful for broadcast-type
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* events like class prepare/load/unload, thread start/end, etc.)
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* or do some internal work to set up the event notification (useful for
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* execution-related events like breakpoints, single-stepping, etc.).
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*/
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public static void registerEvent (EventRequest request)
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{ }
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/**
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* Unregisters the given request
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*
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* @param request the request to unregister
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*/
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public static void unregisterEvent (EventRequest request)
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{ }
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/**
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* Clear all events of the given kind
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*
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* @param kind the type of events to clear
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*/
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public static void clearEvents (byte kind) { }
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}
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