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