00001 package gov.nasa.arc.ase.jpf.jvm.bytecode;
00002
00003 import de.fub.bytecode.classfile.ConstantPool;
00004 import gov.nasa.arc.ase.jpf.jvm.SystemState;
00005 import gov.nasa.arc.ase.jpf.jvm.KernelState;
00006 import gov.nasa.arc.ase.jpf.jvm.ThreadInfo;
00007 import gov.nasa.arc.ase.jpf.jvm.ElementInfo;
00008 import gov.nasa.arc.ase.util.Debug;
00009
00010 public class CHECKCAST extends Instruction {
00011 String type;
00012
00013 public Instruction execute(SystemState ss, KernelState ks, ThreadInfo th) {
00014 int objref = th.pop();
00015
00016 if(objref == -1)
00017 th.push(objref, true);
00018 else {
00019 ElementInfo e = ks.da.get(objref);
00020
00021 if(e.instanceOf(type))
00022 th.push(objref, true);
00023 else
00024 return th.createAndThrowException("java.lang.ClassCastException");
00025 }
00026
00027 return th.getPC().getNext();
00028 }
00029 public void setPeer(de.fub.bytecode.generic.Instruction i, ConstantPool cp) {
00030 type = cp.constantToString(cp.getConstant(((de.fub.bytecode.generic.CHECKCAST)i).getIndex()));
00031 if(!type.startsWith("[")) type = "L" + type + ";";
00032 }
00033 }
