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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 x2y family of instructions.
24   *
25   * @version $Id: ConversionInstruction.html 1021978 2017-12-09 17:38:21Z ggregory $
26   */
27  public abstract class ConversionInstruction extends Instruction implements TypedInstruction,
28          StackProducer, StackConsumer {
29  
30      /**
31       * Empty constructor needed for Instruction.readInstruction.
32       * Not to be used otherwise.
33       */
34      ConversionInstruction() {
35      }
36  
37  
38      /**
39       * @param opcode opcode of instruction
40       */
41      protected ConversionInstruction(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.D2I:
53              case Const.F2I:
54              case Const.L2I:
55                  return Type.INT;
56              case Const.D2F:
57              case Const.I2F:
58              case Const.L2F:
59                  return Type.FLOAT;
60              case Const.D2L:
61              case Const.F2L:
62              case Const.I2L:
63                  return Type.LONG;
64              case Const.F2D:
65              case Const.I2D:
66              case Const.L2D:
67                  return Type.DOUBLE;
68              case Const.I2B:
69                  return Type.BYTE;
70              case Const.I2C:
71                  return Type.CHAR;
72              case Const.I2S:
73                  return Type.SHORT;
74              default: // Never reached
75                  throw new ClassGenException("Unknown type " + _opcode);
76          }
77      }
78  }