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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  /***
    58   * Super class for the family of arithmetic instructions.
    59   *
    60   * @version $Id: ArithmeticInstruction.java,v 1.1.1.1 2001/10/29 20:00:06 jvanzyl Exp $
    61   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
    62   */
    63  public abstract class ArithmeticInstruction extends Instruction
    64    implements TypedInstruction, StackProducer, StackConsumer {
    65    /***
    66     * Empty constructor needed for the Class.newInstance() statement in
    67     * Instruction.readInstruction(). Not to be used otherwise.
    68     */
    69    ArithmeticInstruction() {}
    70
    71    /***
    72     * @param opcode of instruction
    73     */
    74    protected ArithmeticInstruction(short opcode) {
    75      super(opcode, (short)1);
    76    }
    77
    78    /*** @return type associated with the instruction
    79     */
    80    public Type getType(ConstantPoolGen cp) {
    81      switch(opcode) {
    82      case Constants.DADD: case Constants.DDIV: case Constants.DMUL:
    83      case Constants.DNEG: case Constants.DREM: case Constants.DSUB:
    84        return Type.DOUBLE;
    85
    86      case Constants.FADD: case Constants.FDIV: case Constants.FMUL:
    87      case Constants.FNEG: case Constants.FREM: case Constants.FSUB:
    88        return Type.FLOAT;
    89
    90      case Constants.IADD: case Constants.IAND: case Constants.IDIV:
    91      case Constants.IMUL: case Constants.INEG: case Constants.IOR: case Constants.IREM:
    92      case Constants.ISHL: case Constants.ISHR: case Constants.ISUB:
    93      case Constants.IUSHR: case Constants.IXOR:
    94        return Type.INT;
    95
    96      case Constants.LADD: case Constants.LAND: case Constants.LDIV:
    97      case Constants.LMUL: case Constants.LNEG: case Constants.LOR: case Constants.LREM:
    98      case Constants.LSHL: case Constants.LSHR: case Constants.LSUB:
    99      case Constants.LUSHR: case Constants.LXOR:
    100       return Type.LONG;
    101
    102     default: // Never reached
    103       throw new ClassGenException("Unknown type " + opcode);
    104     }
    105   }
    106 }

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