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