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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   */
18  package org.apache.bcel.generic;
19  
20  import org.apache.bcel.Const;
21  
22  /**
23   * Super class for the family of arithmetic instructions.
24   *
25   * @version $Id: ArithmeticInstruction.html 1021978 2017-12-09 17:38:21Z ggregory $
26   */
27  public abstract class ArithmeticInstruction extends Instruction implements TypedInstruction,
28          StackProducer, StackConsumer {
29  
30      /**
31       * Empty constructor needed for Instruction.readInstruction.
32       * Not to be used otherwise.
33       */
34      ArithmeticInstruction() {
35      }
36  
37  
38      /**
39       * @param opcode of instruction
40       */
41      protected ArithmeticInstruction(final short opcode) {
42          super(opcode, (short) 1);
43      }
44  
45  
46      /** @return type associated with the instruction
47       */
48      @Override
49      public Type getType( final ConstantPoolGen cp ) {
50          final short _opcode = super.getOpcode();
51          switch (_opcode) {
52              case Const.DADD:
53              case Const.DDIV:
54              case Const.DMUL:
55              case Const.DNEG:
56              case Const.DREM:
57              case Const.DSUB:
58                  return Type.DOUBLE;
59              case Const.FADD:
60              case Const.FDIV:
61              case Const.FMUL:
62              case Const.FNEG:
63              case Const.FREM:
64              case Const.FSUB:
65                  return Type.FLOAT;
66              case Const.IADD:
67              case Const.IAND:
68              case Const.IDIV:
69              case Const.IMUL:
70              case Const.INEG:
71              case Const.IOR:
72              case Const.IREM:
73              case Const.ISHL:
74              case Const.ISHR:
75              case Const.ISUB:
76              case Const.IUSHR:
77              case Const.IXOR:
78                  return Type.INT;
79              case Const.LADD:
80              case Const.LAND:
81              case Const.LDIV:
82              case Const.LMUL:
83              case Const.LNEG:
84              case Const.LOR:
85              case Const.LREM:
86              case Const.LSHL:
87              case Const.LSHR:
88              case Const.LSUB:
89              case Const.LUSHR:
90              case Const.LXOR:
91                  return Type.LONG;
92              default: // Never reached
93                  throw new ClassGenException("Unknown type " + _opcode);
94          }
95      }
96  }