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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: }