1   package org.apache.bcel.generic;
2   
3   /* ====================================================================
4    * The Apache Software License, Version 1.1
5    *
6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
7    * reserved.
8    *
9    * Redistribution and use in source and binary forms, with or without
10   * modification, are permitted provided that the following conditions
11   * are met:
12   *
13   * 1. Redistributions of source code must retain the above copyright
14   *    notice, this list of conditions and the following disclaimer.
15   *
16   * 2. Redistributions in binary form must reproduce the above copyright
17   *    notice, this list of conditions and the following disclaimer in
18   *    the documentation and/or other materials provided with the
19   *    distribution.
20   *
21   * 3. The end-user documentation included with the redistribution,
22   *    if any, must include the following acknowledgment:
23   *       "This product includes software developed by the
24   *        Apache Software Foundation (http://www.apache.org/)."
25   *    Alternately, this acknowledgment may appear in the software itself,
26   *    if and wherever such third-party acknowledgments normally appear.
27   *
28   * 4. The names "Apache" and "Apache Software Foundation" and
29   *    "Apache BCEL" must not be used to endorse or promote products
30   *    derived from this software without prior written permission. For
31   *    written permission, please contact apache@apache.org.
32   *
33   * 5. Products derived from this software may not be called "Apache",
34   *    "Apache BCEL", nor may "Apache" appear in their name, without
35   *    prior written permission of the Apache Software Foundation.
36   *
37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48   * SUCH DAMAGE.
49   * ====================================================================
50   *
51   * This software consists of voluntary contributions made by many
52   * individuals on behalf of the Apache Software Foundation.  For more
53   * information on the Apache Software Foundation, please see
54   * <http://www.apache.org/>.
55   */
56  import org.apache.bcel.Constants;
57  import org.apache.bcel.generic.InstructionHandle;
58  
59  /*** 
60   * Returnaddress, the type JSR or JSR_W instructions push upon the stack.
61   *
62   * see vmspec2 §3.3.3
63   * @version $Id: ReturnaddressType.java,v 1.1.1.1 2001/10/29 20:00:26 jvanzyl Exp $
64   * @author  <A HREF="http://www.inf.fu-berlin.de/~ehaase">Enver Haase</A>
65   */
66  public class ReturnaddressType extends Type {
67  
68    public static final ReturnaddressType NO_TARGET = new ReturnaddressType();
69    private InstructionHandle returnTarget;
70   
71    /***
72     * A Returnaddress [that doesn't know where to return to].
73     */
74    private ReturnaddressType(){
75      super(Constants.T_ADDRESS, "<return address>");
76    }
77   	
78    /***
79     * Creates a ReturnaddressType object with a target.
80     */
81    public ReturnaddressType(InstructionHandle returnTarget) {
82      super(Constants.T_ADDRESS, "<return address targeting "+returnTarget+">");
83    	this.returnTarget = returnTarget;
84    }
85  	
86    /***
87     * Returns if the two Returnaddresses refer to the same target.
88     */
89    public boolean equals(Object rat){
90      if(!(rat instanceof ReturnaddressType))
91        return false;
92  
93      return ((ReturnaddressType)rat).returnTarget.equals(this.returnTarget);
94    }	
95  
96    /***
97     * @return the target of this ReturnaddressType
98     */
99    public InstructionHandle getTarget(){
100     return returnTarget;
101   }
102 }
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