--- /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 + */ +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."); + } +}