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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