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A Java Optimization Framework
There is a newer version: 4.1.0
package soot.jimple;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 1997 - 1999 Raja Vallee-Rai
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 2.1 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import java.util.Collections;
import java.util.List;

import soot.Type;
import soot.UnitPrinter;
import soot.ValueBox;
import soot.util.Switch;

/**
 * ParameterRef objects are used by Body objects to refer to the parameter slots on method entry.
 * 

 *
 * For instance, in an instance method, the first statement will often be  this := @parameter0; 
 */
public class ParameterRef implements IdentityRef {
  int n;
  Type paramType;

  /** Constructs a ParameterRef object of the specified type, representing the specified parameter number. */
  public ParameterRef(Type paramType, int number) {
    this.n = number;
    this.paramType = paramType;
  }

  public boolean equivTo(Object o) {
    if (o instanceof ParameterRef) {
      return n == ((ParameterRef) o).n && paramType.equals(((ParameterRef) o).paramType);
    }
    return false;
  }

  public int equivHashCode() {
    return n * 101 + paramType.hashCode() * 17;
  }

  /** Create a new ParameterRef object with the same paramType and number. */
  public Object clone() {
    return new ParameterRef(paramType, n);
  }

  /** Converts the given ParameterRef into a String i.e. @parameter0: .int. */
  public String toString() {
    return "@parameter" + n + ": " + paramType;
  }

  public void toString(UnitPrinter up) {
    up.identityRef(this);
  }

  /** Returns the index of this ParameterRef. */
  public int getIndex() {
    return n;
  }

  /** Sets the index of this ParameterRef. */
  public void setIndex(int index) {
    n = index;
  }

  @Override
  public final List getUseBoxes() {
    return Collections.emptyList();
  }

  /** Returns the type of this ParameterRef. */
  public Type getType() {
    return paramType;
  }

  /** Used with RefSwitch. */
  public void apply(Switch sw) {
    ((RefSwitch) sw).caseParameterRef(this);
  }
}