Source for gnu.classpath.jdwp.VMFrame

   1: /* VMFrame.java -- Reference implementation of VM hooks for JDWP Frame access.
   2:    Copyright (C) 2005, 2006 Free Software Foundation
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: terms of your choice, provided that you also meet, for each linked
  32: independent module, the terms and conditions of the license of that
  33: module.  An independent module is a module which is not derived from
  34: or based on this library.  If you modify this library, you may extend
  35: this exception to your version of the library, but you are not
  36: obligated to do so.  If you do not wish to do so, delete this
  37: exception statement from your version. */
  38: 
  39: 
  40: package gnu.classpath.jdwp;
  41: 
  42: import gnu.classpath.jdwp.util.Location;
  43: 
  44: /**
  45:  * Reference implementation of VM hooks for JDWP Frame access.
  46:  * 
  47:  * @author aluchko 
  48:  */
  49: 
  50: public class VMFrame
  51: {
  52:   /**
  53:    * Returns the size of a frame ID over JDWP
  54:    */
  55:   public static final int SIZE = 8;
  56: 
  57:   // The object this frame resides in
  58:   private Object obj;
  59:   
  60:   // The current location of this frame
  61:   private Location loc;
  62:   
  63:   // id of this frame
  64:   private long id;
  65:   
  66:   /**
  67:    * Gets the current location of the frame.
  68:    */
  69:   public Location getLocation()
  70:   {
  71:     return loc;
  72:   }
  73: 
  74:   /**
  75:    * Returns the value of the variable in the given slot.
  76:    * 
  77:    * @param slot the slot containing the variable
  78:    */
  79:   public native Object getValue(int slot);
  80: 
  81:   /**
  82:    * Assigns the given variable to the given value. 
  83:    * @param slot The slot which contains the variable
  84:    * @param value The value to assign the variable to
  85:    */
  86:   public native void setValue(int slot, Object value);
  87: 
  88:   /**
  89:    * Get the object which is represented by 'this' in the context of the frame,
  90:    * returns null if the method is native or static.
  91:    */
  92:   public Object getObject()
  93:   {
  94:     return obj;
  95:   }
  96: 
  97:   /**
  98:    * Get the frameID
  99:    * @return an id which is unique within the scope of the VM
 100:    */
 101:   public long getId()
 102:   {
 103:     return id;
 104:   }
 105: 
 106: }