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