package org.aspectj.apache.bcel.generic;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache BCEL" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
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 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache BCEL", nor may "Apache" appear in their name, without
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
import org.aspectj.apache.bcel.Constants;
import org.aspectj.apache.bcel.generic.InstructionHandle;

/** 
 * Returnaddress, the type JSR or JSR_W instructions push upon the stack.
 *
 * see vmspec2 §3.3.3
 * @version $Id: ReturnaddressType.java,v 1.3 2008/05/28 23:52:56 aclement Exp $
 * @author  <A HREF="http://www.inf.fu-berlin.de/~ehaase">Enver Haase</A>
 */
public class ReturnaddressType extends Type {

  public static final ReturnaddressType NO_TARGET = new ReturnaddressType();
  private InstructionHandle returnTarget;
 
  /**
   * A Returnaddress [that doesn't know where to return to].
   */
  private ReturnaddressType(){
    super(Constants.T_ADDRESS, "<return address>");
  }
 	
  /**
   * Creates a ReturnaddressType object with a target.
   */
  public ReturnaddressType(InstructionHandle returnTarget) {
    super(Constants.T_ADDRESS, "<return address targeting "+returnTarget+">");
  	this.returnTarget = returnTarget;
  }
	
  /**
   * Returns if the two Returnaddresses refer to the same target.
   */
  public boolean equals(Object rat){
    if(!(rat instanceof ReturnaddressType))
      return false;

    return ((ReturnaddressType)rat).returnTarget.equals(this.returnTarget);
  }	

  /**
   * @return the target of this ReturnaddressType
   */
  public InstructionHandle getTarget(){
    return returnTarget;
  }
}
