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