de.fub.bytecode.generic
Class TargetLostException

java.lang.Object
  |
  +--java.lang.Throwable
        |
        +--java.lang.Exception
              |
              +--de.fub.bytecode.generic.TargetLostException

All Implemented Interfaces:

java.io.Serializable

public final class TargetLostException

extends java.lang.Exception

Thrown by InstructionList.remove() when one or multiple disposed instruction are still being referenced by a InstructionTargeter object. I.e. the InstructionTargeter has to be notified that (one of) the InstructionHandle it is referencing is being removed from the InstructionList and thus not valid anymore. Making this an exception instead of a return value forces the user to handle these case explicitely in a try { ... } catch. The following code illustrates how this may be done:

     ...
     try {
	il.delete(start_ih, end_ih);
     } catch(TargetLostException e) {
       InstructionHandle[] targets = e.getTargets();
	 for(int i=0; i < targets.length; i++) {
	   InstructionTargeter[] targeters = targets[i].getTargeters();
     
	   for(int j=0; j < targeters.length; j++)
	     targeters[j].updateTarget(targets[i], new_target);
       }
     }
 

Version:

$Id: TargetLostException.java,v 1.2 2001/05/09 09:26:57 dahm Exp $

Author:

M. Dahm

See Also:

InstructionHandle, InstructionList, InstructionTargeter, Serialized Form

Method Summary

InstructionHandle[]

getTargets()

Methods inherited from class java.lang.Throwable

fillInStackTrace, getLocalizedMessage, getMessage, printStackTrace, printStackTrace, printStackTrace, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

getTargets

public InstructionHandle[] getTargets()

Returns:

list of instructions still being targeted.