//
// Copyright (C) 2006 United States Government as represented by the
// Administrator of the National Aeronautics and Space Administration
// (NASA). All Rights Reserved.
//
// This software is distributed under the NASA Open Source Agreement
// (NOSA), version 1.3. The NOSA has been approved by the Open Source
// Initiative. See the file NOSA-1.3-JPF at the top of the distribution
// directory tree for the complete NOSA document.
//
// THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY
// KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT
// LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL CONFORM TO
// SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR
// A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT
// THE SUBJECT SOFTWARE WILL BE ERROR FREE, OR ANY WARRANTY THAT
// DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE SUBJECT SOFTWARE.
//
package gov.nasa.jpf.jvm.bytecode;
import cmu.conditional.Conditional;
import de.fosd.typechef.featureexpr.FeatureExpr;
import de.fosd.typechef.featureexpr.FeatureExprFactory;
import gov.nasa.jpf.jvm.JVMInstruction;
import gov.nasa.jpf.vm.ThreadInfo;
/**
* abstraction for all array instructions
*/
public abstract class ArrayInstruction extends JVMInstruction {
protected Conditional<Integer> arrayRef;
/**
* only makes sense from an executeInstruction() or instructionExecuted() listener,
* it is undefined outside of insn exec notifications
*/
public int getArrayRef (ThreadInfo ti){
if (ti.isPreExec()){
return peekArrayRef(FeatureExprFactory.True(), ti).getValue();
} else {
return arrayRef.getValue();
}
}
abstract protected Conditional<Integer> peekArrayRef (FeatureExpr ctx, ThreadInfo ti);
@Override
public void accept(InstructionVisitor insVisitor) {
insVisitor.visit(this);
}
}