| Frames | No Frames |
1: /* StackFrameCommandSet.java -- class to implement the StackFrame Command Set 2: Copyright (C) 2005, 2007 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.processor; 41: 42: import gnu.classpath.jdwp.JdwpConstants; 43: import gnu.classpath.jdwp.VMFrame; 44: import gnu.classpath.jdwp.VMVirtualMachine; 45: import gnu.classpath.jdwp.exception.JdwpException; 46: import gnu.classpath.jdwp.exception.JdwpInternalErrorException; 47: import gnu.classpath.jdwp.exception.NotImplementedException; 48: import gnu.classpath.jdwp.id.ThreadId; 49: import gnu.classpath.jdwp.value.ObjectValue; 50: import gnu.classpath.jdwp.value.Value; 51: import gnu.classpath.jdwp.value.ValueFactory; 52: 53: import java.io.DataOutputStream; 54: import java.io.IOException; 55: import java.nio.ByteBuffer; 56: 57: /** 58: * A class representing the StackFrame Command Set. 59: * 60: * @author Aaron Luchko <aluchko@redhat.com> 61: */ 62: public class StackFrameCommandSet 63: extends CommandSet 64: { 65: public boolean runCommand(ByteBuffer bb, DataOutputStream os, byte command) 66: throws JdwpException 67: { 68: boolean keepRunning = true; 69: try 70: { 71: switch (command) 72: { 73: case JdwpConstants.CommandSet.StackFrame.GET_VALUES: 74: executeGetValues(bb, os); 75: break; 76: case JdwpConstants.CommandSet.StackFrame.SET_VALUES: 77: executeSetValues(bb, os); 78: break; 79: case JdwpConstants.CommandSet.StackFrame.THIS_OBJECT: 80: executeThisObject(bb, os); 81: break; 82: case JdwpConstants.CommandSet.StackFrame.POP_FRAMES: 83: executePopFrames(bb, os); 84: break; 85: default: 86: throw new NotImplementedException("Command " + command + 87: " not found in Stack Frame Command Set."); 88: } 89: } 90: catch (IOException ex) 91: { 92: // The DataOutputStream we're using isn't talking to a socket at all 93: // So if we throw an IOException we're in serious trouble 94: throw new JdwpInternalErrorException(ex); 95: } 96: 97: return false; 98: } 99: 100: private void executeGetValues(ByteBuffer bb, DataOutputStream os) 101: throws JdwpException, IOException 102: { 103: ThreadId tId = (ThreadId) idMan.readObjectId(bb); 104: Thread thread = tId.getThread(); 105: 106: // Although Frames look like other ids they are not. First they are not 107: // ObjectIds since they don't exist in the users code. Storing them as an 108: // ObjectId would mean they could be garbage collected since no one else 109: // has a reference to them. Furthermore they are not ReferenceTypeIds since 110: // these are held permanently and we want these to be held only as long as 111: // the Thread is suspended. 112: long frameID = bb.getLong(); 113: VMFrame frame = VMVirtualMachine.getFrame(thread, frameID); 114: int slots = bb.getInt(); 115: os.writeInt(slots); // Looks pointless but this is the protocol 116: for (int i = 0; i < slots; i++) 117: { 118: int slot = bb.getInt(); 119: byte sig = bb.get(); 120: Value val = frame.getValue(slot, sig); 121: val.writeTagged(os); 122: } 123: } 124: 125: private void executeSetValues(ByteBuffer bb, DataOutputStream os) 126: throws JdwpException, IOException 127: { 128: ThreadId tId = (ThreadId) idMan.readObjectId(bb); 129: Thread thread = tId.getThread(); 130: 131: long frameID = bb.getLong(); 132: VMFrame frame = VMVirtualMachine.getFrame(thread, frameID); 133: 134: int slots = bb.getInt(); 135: for (int i = 0; i < slots; i++) 136: { 137: int slot = bb.getInt(); 138: Value value = ValueFactory.createFromTagged(bb); 139: frame.setValue(slot, value); 140: } 141: } 142: 143: private void executeThisObject(ByteBuffer bb, DataOutputStream os) 144: throws JdwpException, IOException 145: { 146: ThreadId tId = (ThreadId) idMan.readObjectId(bb); 147: Thread thread = tId.getThread(); 148: 149: long frameID = bb.getLong(); 150: VMFrame frame = VMVirtualMachine.getFrame(thread, frameID); 151: 152: ObjectValue objVal = new ObjectValue(frame.getObject()); 153: objVal.writeTagged(os); 154: } 155: 156: private void executePopFrames(ByteBuffer bb, DataOutputStream os) 157: throws JdwpException, IOException 158: { 159: if (!VMVirtualMachine.canPopFrames) 160: { 161: String msg = "popping frames is unsupported"; 162: throw new NotImplementedException(msg); 163: } 164: 165: ThreadId tid = (ThreadId) idMan.readObjectId(bb); 166: Thread thread = tid.getThread(); 167: long fid = bb.getLong(); 168: VMVirtualMachine.popFrames(thread, fid); 169: } 170: }