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 * Constructs an ArithmeticInstruction.
36 *
37 * @param opcode of instruction.
38 */
39 protected ArithmeticInstruction(final short opcode) {
40 super(opcode, (short) 1);
41 }
42
43 /**
44 * @return type associated with the instruction.
45 */
46 @Override
47 public Type getType(final ConstantPoolGen cp) {
48 final short opcode = super.getOpcode();
49 switch (opcode) {
50 case Const.DADD:
51 case Const.DDIV:
52 case Const.DMUL:
53 case Const.DNEG:
54 case Const.DREM:
55 case Const.DSUB:
56 return Type.DOUBLE;
57 case Const.FADD:
58 case Const.FDIV:
59 case Const.FMUL:
60 case Const.FNEG:
61 case Const.FREM:
62 case Const.FSUB:
63 return Type.FLOAT;
64 case Const.IADD:
65 case Const.IAND:
66 case Const.IDIV:
67 case Const.IMUL:
68 case Const.INEG:
69 case Const.IOR:
70 case Const.IREM:
71 case Const.ISHL:
72 case Const.ISHR:
73 case Const.ISUB:
74 case Const.IUSHR:
75 case Const.IXOR:
76 return Type.INT;
77 case Const.LADD:
78 case Const.LAND:
79 case Const.LDIV:
80 case Const.LMUL:
81 case Const.LNEG:
82 case Const.LOR:
83 case Const.LREM:
84 case Const.LSHL:
85 case Const.LSHR:
86 case Const.LSUB:
87 case Const.LUSHR:
88 case Const.LXOR:
89 return Type.LONG;
90 default: // Never reached
91 throw new ClassGenException("Unknown type " + opcode);
92 }
93 }
94 }