//
// 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 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;
/**
* Return from subroutine
* No change
*/
public class RET extends JVMInstruction {
private int index;
public RET( int index){
this.index = index;
}
@Override
public Conditional<Instruction> execute (FeatureExpr ctx, ThreadInfo ti) {
StackFrame frame = ti.getTopFrame();
Conditional<Integer> jumpTgt = frame.getLocalVariable(ctx, index);
return jumpTgt.map(new Function<Integer, Instruction>() {
@Override
public Instruction apply(Integer jumpTgt) {
return mi.getInstructionAt(jumpTgt);
}
});
}
public int getLength() {
return 2; // opcode, insnIndex
}
public int getByteCode () {
return 0xA9; // ?? wide
}
public void accept(InstructionVisitor insVisitor) {
insVisitor.visit(this);
}
public int getIndex() {
return index;
}
}