001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 * 017 */ 018package org.apache.bcel.generic; 019 020/** 021 * ACONST_NULL - Push null reference 022 * <PRE>Stack: ... -> ..., null</PRE> 023 * 024 * @version $Id: ACONST_NULL.java 1806200 2017-08-25 16:33:06Z ggregory $ 025 */ 026public class ACONST_NULL extends Instruction implements PushInstruction, TypedInstruction { 027 028 /** 029 * Push null reference 030 */ 031 public ACONST_NULL() { 032 super(org.apache.bcel.Const.ACONST_NULL, (short) 1); 033 } 034 035 036 /** @return Type.NULL 037 */ 038 @Override 039 public Type getType( final ConstantPoolGen cp ) { 040 return Type.NULL; 041 } 042 043 044 /** 045 * Call corresponding visitor method(s). The order is: 046 * Call visitor methods of implemented interfaces first, then 047 * call methods according to the class hierarchy in descending order, 048 * i.e., the most specific visitXXX() call comes last. 049 * 050 * @param v Visitor object 051 */ 052 @Override 053 public void accept( final Visitor v ) { 054 v.visitStackProducer(this); 055 v.visitPushInstruction(this); 056 v.visitTypedInstruction(this); 057 v.visitACONST_NULL(this); 058 } 059}