JSR_W.java

//
// 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 java.util.function.Function;
import cmu.conditional.One;
import de.fosd.typechef.featureexpr.FeatureExpr;
import gov.nasa.jpf.jvm.JVMInstruction;
import gov.nasa.jpf.vm.Instruction;
import gov.nasa.jpf.vm.StackFrame;
import gov.nasa.jpf.vm.ThreadInfo;


/**
 * Jump subroutine (wide insnIndex)
 * ... => ..., address
 */
public class JSR_W extends JVMInstruction {
  protected int target;

  public JSR_W(int targetPc){
    target = targetPc;
  }

  @Override
  public Conditional<Instruction> execute (FeatureExpr ctx, ThreadInfo ti) {
    StackFrame frame = ti.getModifiableTopFrame();
    
    Conditional<Integer> tgtAdr = getNext(ctx, ti).map(new Function<Instruction, Integer>() {

		@Override
		public Integer apply(Instruction i) {
			return i.getPosition();
		}
    	
    });
    
    frame.push(ctx, tgtAdr);

    return new One<>(mi.getInstructionAt(target));
  }

  public int getLength() {
    return 5; // opcode, bb1, bb2, bb3, bb4
  }
  
  @Override
  public int getByteCode () {
    return 0xC9;
  }
  
  @Override
  public void accept(InstructionVisitor insVisitor) {
	  insVisitor.visit(this);
  }
 
  public int getTarget() {
	  return target;
  }

}