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 * Constructs a ConversionInstruction.
36 *
37 * @param opcode opcode of instruction.
38 */
39 protected ConversionInstruction(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.D2I:
51 case Const.F2I:
52 case Const.L2I:
53 return Type.INT;
54 case Const.D2F:
55 case Const.I2F:
56 case Const.L2F:
57 return Type.FLOAT;
58 case Const.D2L:
59 case Const.F2L:
60 case Const.I2L:
61 return Type.LONG;
62 case Const.F2D:
63 case Const.I2D:
64 case Const.L2D:
65 return Type.DOUBLE;
66 case Const.I2B:
67 return Type.BYTE;
68 case Const.I2C:
69 return Type.CHAR;
70 case Const.I2S:
71 return Type.SHORT;
72 default: // Never reached
73 throw new ClassGenException("Unknown type " + opcode);
74 }
75 }
76 }