| /* VMVirtualMachine.java -- A reference implementation of a JDWP virtual |
| machine |
| |
| Copyright (C) 2005, 2006 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 |
| 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; |
| |
| import gnu.classpath.jdwp.event.EventRequest; |
| import gnu.classpath.jdwp.exception.InvalidMethodException; |
| import gnu.classpath.jdwp.exception.JdwpException; |
| import gnu.classpath.jdwp.util.MethodResult; |
| import java.lang.reflect.Method; |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.Hashtable; |
| import java.util.Iterator; |
| |
| /** |
| * A virtual machine according to JDWP. |
| * |
| * @author Keith Seitz <keiths@redhat.com> |
| */ |
| public class VMVirtualMachine |
| { |
| // Thread suspension table. Maps Thread to suspend count (Integer) |
| private static Hashtable _jdwp_suspend_counts; |
| |
| public static native void initialize (); |
| |
| /** |
| * Suspend a thread |
| * |
| * @param thread the thread to suspend |
| */ |
| public static native void suspendThread (Thread thread) |
| throws JdwpException; |
| |
| /** |
| * Suspend all threads |
| */ |
| public static void suspendAllThreads () |
| throws JdwpException |
| { |
| // Our JDWP thread group -- don't suspend any of those threads |
| Thread current = Thread.currentThread (); |
| ThreadGroup jdwpGroup = Jdwp.getDefault().getJdwpThreadGroup(); |
| |
| // Find the root ThreadGroup |
| ThreadGroup group = jdwpGroup; |
| ThreadGroup parent = group.getParent (); |
| while (parent != null) |
| { |
| group = parent; |
| parent = group.getParent (); |
| } |
| |
| // Get all the threads in the system |
| int num = group.activeCount (); |
| Thread[] threads = new Thread[num]; |
| group.enumerate (threads); |
| |
| for (int i = 0; i < num; ++i) |
| { |
| Thread t = threads[i]; |
| if (t != null) |
| { |
| if (t.getThreadGroup () == jdwpGroup || t == current) |
| { |
| // Don't suspend the current thread or any JDWP thread |
| continue; |
| } |
| else |
| suspendThread (t); |
| } |
| } |
| |
| // Now suspend the current thread |
| if (current.getThreadGroup() != jdwpGroup) |
| suspendThread (current); |
| } |
| |
| /** |
| * Resume a thread. A thread must be resumed as many times |
| * as it has been suspended. |
| * |
| * @param thread the thread to resume |
| */ |
| public static native void resumeThread (Thread thread) |
| throws JdwpException; |
| |
| /** |
| * Resume all threads. This simply decrements the thread's |
| * suspend count. It can not be used to force the application |
| * to run. |
| */ |
| public static void resumeAllThreads () |
| throws JdwpException |
| { |
| // Our JDWP thread group -- don't resume |
| Thread current = Thread.currentThread (); |
| ThreadGroup jdwpGroup = current.getThreadGroup (); |
| |
| // Find the root ThreadGroup |
| ThreadGroup group = jdwpGroup; |
| ThreadGroup parent = group.getParent (); |
| while (parent != null) |
| { |
| group = parent; |
| parent = group.getParent (); |
| } |
| |
| // Get all the threads in the system |
| int num = group.activeCount (); |
| Thread[] threads = new Thread[num]; |
| group.enumerate (threads); |
| |
| for (int i = 0; i < num; ++i) |
| { |
| Thread t = threads[i]; |
| if (t != null) |
| { |
| if (t.getThreadGroup () == jdwpGroup || t == current) |
| { |
| // Don't resume the current thread or any JDWP thread |
| continue; |
| } |
| else |
| resumeThread (t); |
| } |
| } |
| } |
| |
| /** |
| * Get the suspend count for a give thread |
| * |
| * @param thread the thread whose suspend count is desired |
| * @return the number of times the thread has been suspended |
| */ |
| public static native int getSuspendCount (Thread thread) |
| throws JdwpException; |
| |
| /** |
| * Returns a count of the number of loaded classes in the VM |
| */ |
| public static native int getAllLoadedClassesCount () |
| throws JdwpException; |
| |
| /** |
| * Returns an iterator over all the loaded classes in the VM |
| */ |
| public static native Iterator getAllLoadedClasses () |
| throws JdwpException; |
| |
| /** |
| * Returns the status of the given class |
| * |
| * @param clazz the class whose status is desired |
| * @return a flag containing the class's status |
| * @see JdwpConstants.ClassStatus |
| */ |
| public static native int getClassStatus (Class clazz) |
| throws JdwpException; |
| |
| /** |
| * Returns all of the methods defined in the given class. This |
| * includes all methods, constructors, and class initializers. |
| * |
| * @param klass the class whose methods are desired |
| * @return an array of virtual machine methods |
| */ |
| public static native VMMethod[] getAllClassMethods (Class klass) |
| throws JdwpException; |
| |
| /** |
| * A factory method for getting valid virtual machine methods |
| * which may be passed to/from the debugger. |
| * |
| * @param klass the class in which the method is defined |
| * @param id the ID of the desired method |
| * @return the desired internal representation of the method |
| * @throws InvalidMethodException if the method is not defined |
| * in the class |
| * @throws JdwpException for any other error |
| */ |
| public static native VMMethod getClassMethod(Class klass, long id) |
| throws JdwpException; |
| |
| /** |
| * Returns the thread's call stack |
| * |
| * @param thread thread for which to get call stack |
| * @param start index of first frame to return |
| * @param length number of frames to return (-1 for all frames) |
| * @return a list of frames |
| */ |
| public static native ArrayList getFrames (Thread thread, int start, |
| int length) |
| throws JdwpException; |
| |
| /** |
| * Returns the frame for a given thread with the frame ID in |
| * the buffer |
| * |
| * I don't like this. |
| * |
| * @param thread the frame's thread |
| * @param bb buffer containing the frame's ID |
| * @return the desired frame |
| */ |
| public static native VMFrame getFrame (Thread thread, ByteBuffer bb) |
| throws JdwpException; |
| |
| /** |
| * Returns the number of frames in the thread's stack |
| * |
| * @param thread the thread for which to get a frame count |
| * @return the number of frames in the thread's stack |
| */ |
| public static native int getFrameCount (Thread thread) |
| throws JdwpException; |
| |
| |
| /** |
| * Returns the status of a thread |
| * |
| * @param thread the thread for which to get status |
| * @return integer status of the thread |
| * @see JdwpConstants.ThreadStatus |
| */ |
| public static native int getThreadStatus (Thread thread) |
| throws JdwpException; |
| |
| /** |
| * Returns a list of all classes which this class loader has been |
| * requested to load |
| * |
| * @param cl the class loader |
| * @return a list of all visible classes |
| */ |
| public static native ArrayList getLoadRequests (ClassLoader cl) |
| throws JdwpException; |
| |
| /** |
| * Executes a method in the virtual machine |
| * |
| * @param obj instance in which to invoke method (null for static) |
| * @param thread the thread in which to invoke the method |
| * @param clazz the class in which the method is defined |
| * @param method the method to invoke |
| * @param values arguments to pass to method |
| * @param nonVirtual "otherwise, normal virtual invoke |
| * (instance methods only) " |
| * @return a result object containing the results of the invocation |
| */ |
| public static native MethodResult executeMethod (Object obj, Thread thread, |
| Class clazz, Method method, |
| Object[] values, |
| boolean nonVirtual) |
| throws JdwpException; |
| |
| /** |
| * "Returns the name of source file in which a reference type was declared" |
| * |
| * @param clazz the class for which to return a source file |
| * @return a string containing the source file name; "no path information |
| * for the file is included" |
| */ |
| public static native String getSourceFile (Class clazz) |
| throws JdwpException; |
| |
| /** |
| * Register a request from the debugger |
| * |
| * Virtual machines have two options. Either do nothing and allow |
| * the event manager to take care of the request (useful for broadcast-type |
| * events like class prepare/load/unload, thread start/end, etc.) |
| * or do some internal work to set up the event notification (useful for |
| * execution-related events like breakpoints, single-stepping, etc.). |
| */ |
| public static native void registerEvent (EventRequest request) |
| throws JdwpException; |
| |
| /** |
| * Unregisters the given request |
| * |
| * @param request the request to unregister |
| */ |
| public static native void unregisterEvent (EventRequest request) |
| throws JdwpException; |
| |
| |
| /** |
| * Clear all events of the given kind |
| * |
| * @param kind the type of events to clear |
| */ |
| public static native void clearEvents (byte kind) |
| throws JdwpException; |
| } |