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    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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