This is the StackFrame command set
http://java.sun.com/j2se/1.5.0/docs/guide/jpda/jdwp/jdwp-protocol.html#JDWP_StackFrame
I'm not entirely sure what our classpath level Frame object will look
like in the end. For this I just have class with a bunch of getters and
setters now which may turn out to be all we need in classpath.
Another thing is although Frames look like other ids they are not. First
they are not ObjectIds since they don't exist in the users code. Storing
them as an ObjectId would mean they could be garbage collected since no
one else has a reference to them. Furthermore they are not
ReferenceTypeIds since these are held permanently and we want these to
be held only as long as the Thread is suspended. For now we will query
the VM for them directly although in the future it may make sense to
store them in some classpath level Object which represents a suspended
thread.
thanks, Aaron
ChangeLog
2005-08-04 Aaron Luchko <[EMAIL PROTECTED]>
*gnu/classpath/jdwp/processor/StackFrameCommandSet.java:
Implemented the StackFrame CommandSet.
--- /dev/null 2005-06-09 16:29:11.371620296 -0400
+++ gnu/classpath/jdwp/processor/StackFrameCommandSet.java 2005-08-05 15:56:52.000000000 -0400
@@ -0,0 +1,163 @@
+/* StackFrameCommandSet.java -- class to implement the StackFrame 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.IVirtualMachine;
+import gnu.classpath.jdwp.Jdwp;
+import gnu.classpath.jdwp.JdwpConstants;
+import gnu.classpath.jdwp.exception.JdwpException;
+import gnu.classpath.jdwp.exception.JdwpInternalErrorException;
+import gnu.classpath.jdwp.exception.NotImplementedException;
+import gnu.classpath.jdwp.id.IdManager;
+import gnu.classpath.jdwp.id.ObjectId;
+import gnu.classpath.jdwp.util.Frame;
+import gnu.classpath.jdwp.util.Value;
+
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+/**
+ * A class representing the StackFrame Command Set.
+ *
+ * @author Aaron Luchko <[EMAIL PROTECTED]>
+ */
+public class StackFrameCommandSet implements CommandSet
+{
+ // Our hook into the jvm
+ private final IVirtualMachine vm = Jdwp.getIVirtualMachine();
+
+ // Manages all the different ids that are assigned by jdwp
+ private final IdManager idMan = Jdwp.getIdManager();
+
+ public boolean runCommand(ByteBuffer bb, DataOutputStream os, byte command)
+ throws JdwpException
+ {
+ boolean keepRunning = true;
+ try
+ {
+ switch (command)
+ {
+ case JdwpConstants.CommandSet.StackFrame.GET_VALUES:
+ executeGetValues(bb, os);
+ break;
+ case JdwpConstants.CommandSet.StackFrame.SET_VALUES:
+ executeSetValues(bb, os);
+ break;
+ case JdwpConstants.CommandSet.StackFrame.THIS_OBJECT:
+ executeThisObject(bb, os);
+ break;
+ case JdwpConstants.CommandSet.StackFrame.POP_FRAMES:
+ executePopFrames(bb, os);
+ break;
+ default:
+ throw new NotImplementedException("Command " + command +
+ " not found in Stack Frame 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 true;
+ }
+
+ private void executeGetValues(ByteBuffer bb, DataOutputStream os)
+ throws JdwpException, IOException
+ {
+ ObjectId tId = idMan.readId(bb);
+ Thread thread = (Thread) tId.getObject();
+
+ // Although Frames look like other ids they are not. First they are not
+ // ObjectIds since they don't exist in the users code. Storing them as an
+ // ObjectId would mean they could be garbage collected since no one else
+ // has a reference to them. Furthermore they are not ReferenceTypeIds since
+ // these are held permanently and we want these to be held only as long as
+ // the Thread is suspended.
+ Frame frame = vm.getFrame(thread, bb);
+ int slots = bb.getInt();
+ os.writeInt(slots); // Looks pointless but this is the protocol
+ for (int i = 0; i < slots; i++)
+ {
+ int slot = bb.getInt();
+ byte sig = bb.get();
+ Object val = frame.getValue(slot);
+ Value.writeTaggedValue(os, val);
+ }
+ }
+
+ private void executeSetValues(ByteBuffer bb, DataOutputStream os)
+ throws JdwpException, IOException
+ {
+ ObjectId tId = idMan.readId(bb);
+ Thread thread = (Thread) tId.getObject();
+
+ Frame frame = vm.getFrame(thread, bb);
+
+ int slots = bb.getInt();
+ for (int i = 0; i < slots; i++)
+ {
+ int slot = bb.getInt();
+ Object value = Value.getObj(bb);
+ frame.setValue(slot, value);
+ }
+ }
+
+ private void executeThisObject(ByteBuffer bb, DataOutputStream os)
+ throws JdwpException, IOException
+ {
+ ObjectId tId = idMan.readId(bb);
+ Thread thread = (Thread) tId.getObject();
+
+ Frame frame = vm.getFrame(thread, bb);
+
+ Object thisObject = frame.getObject();
+ Value.writeTaggedValue(os, thisObject);
+ }
+
+ private void executePopFrames(ByteBuffer bb, DataOutputStream os)
+ throws JdwpException
+ {
+ // This command is optional, determined by VirtualMachines CapabilitiesNew
+ // so we'll leave it till later to implement
+ throw new NotImplementedException("Command PopFrames not implemented.");
+ }
+}
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