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.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[] getExceptions() {
95      return new Class[] { 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 
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