1 // Breakpoint.java -  a base class for interpreter breakpoints
2 
3 /* Copyright (C) 2006, 2007  Free Software Foundation
4 
5    This file is part of libgcj.
6 
7 This software is copyrighted work licensed under the terms of the
8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
9 details.  */
10 
11 package gnu.gcj.jvmti;
12 
13 import gnu.gcj.RawDataManaged;
14 
15 /**
16  * Base class representing a type of breakpoint in the interpreter.
17  * This class deals with saving insns and installing and
18  * uninstalling insns in the interpreter for all breakpoint classes.
19  *
20  * @author Keith Seitz (keiths@redhat.com)
21  */
22 public abstract class Breakpoint
23 {
24   // Location of this breakpoint
25   protected long method;
26   protected long location;
27 
28   // The original instruction that this breakpoint replaced
29   private RawDataManaged data;
30 
31   /**
32    * Constructs a new Breakpoint
33    *
34    * @param method the method in which to set the breakpoint
35    * @param location the location at which to set the breakpoint
36    */
Breakpoint(long method, long location)37   public Breakpoint (long method, long location)
38   {
39     this.method = method;
40     this.location = location;
41   }
42 
Breakpoint()43   public Breakpoint ()
44   {
45   }
46 
_save_insn()47   private native void _save_insn ();
48 
49   /**
50    * Installs the breakpoint into the interpreter
51    */
install()52   public native void install ();
53 
54   /**
55    * Removes the breakpoint from the interpreter, re-installing
56    * the original instruction.
57    */
remove()58   public native void remove ();
59 
60   /**
61    * Returns the original instruction at the location where
62    * this breakpoint was set
63    */
getInsn()64   public RawDataManaged getInsn ()
65   {
66     return data;
67   }
68 
69   /**
70    * Execute the actions of this breakpoint
71    */
execute()72   public abstract void execute ();
73 }
74