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Java > Open Source Codes > org > apache > bcel > generic > ArithmeticInstruction


1 /*
2  * Copyright 2000-2004 The Apache Software Foundation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16  */
17 package org.apache.bcel.generic;
18
19 import org.apache.bcel.Constants;
20
21 /**
22  * Super class for the family of arithmetic instructions.
23  *
24  * @version $Id: ArithmeticInstruction.java 386056 2006-03-15 11:31:56Z tcurdt $
25  * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
26  */
27 public abstract class ArithmeticInstruction extends Instruction implements TypedInstruction,
28         StackProducer, StackConsumer {
29
30     /**
31      * Empty constructor needed for the Class.newInstance() statement in
32      * Instruction.readInstruction(). Not to be used otherwise.
33      */
34     ArithmeticInstruction() {
35     }
36
37
38     /**
39      * @param opcode of instruction
40      */
41     protected ArithmeticInstruction(short opcode) {
42         super(opcode, (short) 1);
43     }
44
45
46     /** @return type associated with the instruction
47      */
48     public Type getType( ConstantPoolGen cp ) {
49         switch (opcode) {
50             case Constants.DADD:
51             case Constants.DDIV:
52             case Constants.DMUL:
53             case Constants.DNEG:
54             case Constants.DREM:
55             case Constants.DSUB:
56                 return Type.DOUBLE;
57             case Constants.FADD:
58             case Constants.FDIV:
59             case Constants.FMUL:
60             case Constants.FNEG:
61             case Constants.FREM:
62             case Constants.FSUB:
63                 return Type.FLOAT;
64             case Constants.IADD:
65             case Constants.IAND:
66             case Constants.IDIV:
67             case Constants.IMUL:
68             case Constants.INEG:
69             case Constants.IOR:
70             case Constants.IREM:
71             case Constants.ISHL:
72             case Constants.ISHR:
73             case Constants.ISUB:
74             case Constants.IUSHR:
75             case Constants.IXOR:
76                 return Type.INT;
77             case Constants.LADD:
78             case Constants.LAND:
79             case Constants.LDIV:
80             case Constants.LMUL:
81             case Constants.LNEG:
82             case Constants.LOR:
83             case Constants.LREM:
84             case Constants.LSHL:
85             case Constants.LSHR:
86             case Constants.LSUB:
87             case Constants.LUSHR:
88             case Constants.LXOR:
89                 return Type.LONG;
90             default: // Never reached
91 throw new ClassGenException("Unknown type " + opcode);
92         }
93     }
94 }
95
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