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IFNULL.java

00001 package gov.nasa.arc.ase.jpf.jvm.bytecode;
00002 
00003 import gov.nasa.arc.ase.jpf.*;
00004 import gov.nasa.arc.ase.jpf.jvm.*;
00005 import de.fub.bytecode.generic.InstructionHandle;
00006 import gov.nasa.arc.ase.util.Debug;
00007 
00008 public class IFNULL extends AbstractInstruction {
00009   private de.fub.bytecode.generic.IFNULL peer;
00010 
00011   public InstructionHandle execute(SystemState ss, KernelState ks, ThreadInfo th) {
00012     int v = th.pop();
00013 
00014     if (v == -1) {
00015       return peer.getTarget();
00016     } else {
00017       return th.getPC().getNext();
00018     }
00019   }  
00020   public void setPeer(de.fub.bytecode.generic.Instruction i) {
00021     peer = (de.fub.bytecode.generic.IFNULL)i;
00022   }  
00023 }

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