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 /**
22 * Super class for stack operations like DUP and POP.
23 */
24 public abstract class StackInstruction extends Instruction {
25
26 /**
27 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
28 */
29 StackInstruction() {
30 }
31
32 /**
33 * @param opcode instruction opcode
34 */
35 protected StackInstruction(final short opcode) {
36 super(opcode, (short) 1);
37 }
38
39 /**
40 * @return Type.UNKNOWN
41 */
42 public Type getType(final ConstantPoolGen cp) {
43 return Type.UNKNOWN;
44 }
45 }