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 package org.apache.bcel.generic;
18
19 /**
20 * ACONST_NULL - Push null reference
21 *
22 * <PRE>
23 * Stack: ... -> ..., null
24 * </PRE>
25 */
26 public class ACONST_NULL extends Instruction implements PushInstruction, TypedInstruction {
27
28 /**
29 * Push null reference
30 */
31 public ACONST_NULL() {
32 super(org.apache.bcel.Const.ACONST_NULL, (short) 1);
33 }
34
35 /**
36 * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
37 * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
38 *
39 * @param v Visitor object
40 */
41 @Override
42 public void accept(final Visitor v) {
43 v.visitStackProducer(this);
44 v.visitPushInstruction(this);
45 v.visitTypedInstruction(this);
46 v.visitACONST_NULL(this);
47 }
48
49 /**
50 * @return Type.NULL
51 */
52 @Override
53 public Type getType(final ConstantPoolGen cp) {
54 return Type.NULL;
55 }
56 }