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 import org.apache.bcel.ExceptionConst;
23
24 /**
25 * Super class for the xRETURN family of instructions.
26 */
27 public abstract class ReturnInstruction extends Instruction implements ExceptionThrower, TypedInstruction, StackConsumer {
28
29 /**
30 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
31 */
32 ReturnInstruction() {
33 }
34
35 /**
36 * @param opcode of instruction
37 */
38 protected ReturnInstruction(final short opcode) {
39 super(opcode, (short) 1);
40 }
41
42 @Override
43 public Class<?>[] getExceptions() {
44 return new Class[] {ExceptionConst.ILLEGAL_MONITOR_STATE};
45 }
46
47 public Type getType() {
48 final short opcode = super.getOpcode();
49 switch (opcode) {
50 case Const.IRETURN:
51 return Type.INT;
52 case Const.LRETURN:
53 return Type.LONG;
54 case Const.FRETURN:
55 return Type.FLOAT;
56 case Const.DRETURN:
57 return Type.DOUBLE;
58 case Const.ARETURN:
59 return Type.OBJECT;
60 case Const.RETURN:
61 return Type.VOID;
62 default: // Never reached
63 throw new ClassGenException("Unknown type " + opcode);
64 }
65 }
66
67 /**
68 * @return type associated with the instruction
69 */
70 @Override
71 public Type getType(final ConstantPoolGen cp) {
72 return getType();
73 }
74 }