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Java > Open Source Codes > com > sun > org > apache > bcel > internal > generic > ReturnInstruction


1 package com.sun.org.apache.bcel.internal.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 com.sun.org.apache.bcel.internal.Constants;
57 import com.sun.org.apache.bcel.internal.ExceptionConstants;
58
59 /**
60  * Super class for the xRETURN family of instructions.
61  *
62  * @version $Id: ReturnInstruction.java,v 1.1.1.1 2001/10/29 20:00:26 jvanzyl Exp $
63  * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
64  */
65 public abstract class ReturnInstruction extends Instruction
66   implements ExceptionThrower, TypedInstruction, StackConsumer {
67   /**
68    * Empty constructor needed for the Class.newInstance() statement in
69    * Instruction.readInstruction(). Not to be used otherwise.
70    */
71   ReturnInstruction() {}
72
73   /**
74    * @param opcode of instruction
75    */
76   protected ReturnInstruction(short opcode) {
77     super(opcode, (short)1);
78   }
79
80   public Type getType() {
81     switch(opcode) {
82       case Constants.IRETURN: return Type.INT;
83       case Constants.LRETURN: return Type.LONG;
84       case Constants.FRETURN: return Type.FLOAT;
85       case Constants.DRETURN: return Type.DOUBLE;
86       case Constants.ARETURN: return Type.OBJECT;
87       case Constants.RETURN: return Type.VOID;
88  
89     default: // Never reached
90 throw new ClassGenException("Unknown type " + opcode);
91     }
92   }
93
94   public Class JavaDoc[] getExceptions() {
95     return new Class JavaDoc[] { ExceptionConstants.ILLEGAL_MONITOR_STATE };
96   }
97
98   /** @return type associated with the instruction
99    */
100   public Type getType(ConstantPoolGen cp) {
101     return getType();
102   }
103 }
104
105
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