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 */
017package org.apache.bcel.generic;
018
019/**
020 * Denotes an unparameterized instruction to load a value from a local variable, e.g. ILOAD.
021 */
022public abstract class LoadInstruction extends LocalVariableInstruction implements PushInstruction {
023
024    /**
025     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise. tag and length are defined in
026     * readInstruction and initFromFile, respectively.
027     */
028    LoadInstruction(final short canonTag, final short cTag) {
029        super(canonTag, cTag);
030    }
031
032    /**
033     * @param opcode Instruction opcode
034     * @param cTag Instruction number for compact version, ALOAD_0, e.g.
035     * @param n local variable index (unsigned short)
036     */
037    protected LoadInstruction(final short opcode, final short cTag, final int n) {
038        super(opcode, cTag, n);
039    }
040
041    /**
042     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
043     * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
044     *
045     * @param v Visitor object
046     */
047    @Override
048    public void accept(final Visitor v) {
049        v.visitStackProducer(this);
050        v.visitPushInstruction(this);
051        v.visitTypedInstruction(this);
052        v.visitLocalVariableInstruction(this);
053        v.visitLoadInstruction(this);
054    }
055}