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
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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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