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1   /*
2    * reserved comment block
3    * DO NOT REMOVE OR ALTER!
4    */
5   package com.sun.org.apache.bcel.internal.generic;
6   
7   /* ====================================================================
8    * The Apache Software License, Version 1.1
9    *
10   * Copyright (c) 2001 The Apache Software Foundation.  All rights
11   * reserved.
12   *
13   * Redistribution and use in source and binary forms, with or without
14   * modification, are permitted provided that the following conditions
15   * are met:
16   *
17   * 1. Redistributions of source code must retain the above copyright
18   *    notice, this list of conditions and the following disclaimer.
19   *
20   * 2. Redistributions in binary form must reproduce the above copyright
21   *    notice, this list of conditions and the following disclaimer in
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25   * 3. The end-user documentation included with the redistribution,
26   *    if any, must include the following acknowledgment:
27   *       "This product includes software developed by the
28   *        Apache Software Foundation (http://www.apache.org/)."
29   *    Alternately, this acknowledgment may appear in the software itself,
30   *    if and wherever such third-party acknowledgments normally appear.
31   *
32   * 4. The names "Apache" and "Apache Software Foundation" and
33   *    "Apache BCEL" must not be used to endorse or promote products
34   *    derived from this software without prior written permission. For
35   *    written permission, please contact apache@apache.org.
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37   * 5. Products derived from this software may not be called "Apache",
38   *    "Apache BCEL", nor may "Apache" appear in their name, without
39   *    prior written permission of the Apache Software Foundation.
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41   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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54   *
55   * This software consists of voluntary contributions made by many
56   * individuals on behalf of the Apache Software Foundation.  For more
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58   * <http://www.apache.org/>.
59   */
60  import com.sun.org.apache.bcel.internal.Constants;
61  /**
62   * Super class for the family of arithmetic instructions.
63   *
64   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
65   */
66  public abstract class ArithmeticInstruction extends Instruction
67    implements TypedInstruction, StackProducer, StackConsumer {
68    /**
69     * Empty constructor needed for the Class.newInstance() statement in
70     * Instruction.readInstruction(). Not to be used otherwise.
71     */
72    ArithmeticInstruction() {}
73  
74    /**
75     * @param opcode of instruction
76     */
77    protected ArithmeticInstruction(short opcode) {
78      super(opcode, (short)1);
79    }
80  
81    /** @return type associated with the instruction
82     */
83    public Type getType(ConstantPoolGen cp) {
84      switch(opcode) {
85      case Constants.DADD: case Constants.DDIV: case Constants.DMUL:
86      case Constants.DNEG: case Constants.DREM: case Constants.DSUB:
87        return Type.DOUBLE;
88  
89      case Constants.FADD: case Constants.FDIV: case Constants.FMUL:
90      case Constants.FNEG: case Constants.FREM: case Constants.FSUB:
91        return Type.FLOAT;
92  
93      case Constants.IADD: case Constants.IAND: case Constants.IDIV:
94      case Constants.IMUL: case Constants.INEG: case Constants.IOR: case Constants.IREM:
95      case Constants.ISHL: case Constants.ISHR: case Constants.ISUB:
96      case Constants.IUSHR: case Constants.IXOR:
97        return Type.INT;
98  
99      case Constants.LADD: case Constants.LAND: case Constants.LDIV:
100     case Constants.LMUL: case Constants.LNEG: case Constants.LOR: case Constants.LREM:
101     case Constants.LSHL: case Constants.LSHR: case Constants.LSUB:
102     case Constants.LUSHR: case Constants.LXOR:
103       return Type.LONG;
104 
105     default: // Never reached
106       throw new ClassGenException("Unknown type " + opcode);
107     }
108   }
109 }