    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 * Denotes an unparameterized instruction to load a value from a local
    022 * variable, e.g. ILOAD.
    023 *
    024 */
    025public abstract class LoadInstruction extends LocalVariableInstruction implements PushInstruction {
    026
    027    /**
    028     * Empty constructor needed for Instruction.readInstruction.
    029     * Not to be used otherwise.
    030     * tag and length are defined in readInstruction and initFromFile, respectively.
    031     */
    032    LoadInstruction(final short canon_tag, final short c_tag) {
    033        super(canon_tag, c_tag);
    034    }
    035
    036
    037    /**
    038     * @param opcode Instruction opcode
    039     * @param c_tag Instruction number for compact version, ALOAD_0, e.g.
    040     * @param n local variable index (unsigned short)
    041     */
    042    protected LoadInstruction(final short opcode, final short c_tag, final int n) {
    043        super(opcode, c_tag, n);
    044    }
    045
    046
    047    /**
    048     * Call corresponding visitor method(s). The order is:
    049     * Call visitor methods of implemented interfaces first, then
    050     * call methods according to the class hierarchy in descending order,
    051     * i.e., the most specific visitXXX() call comes last.
    052     *
    053     * @param v Visitor object
    054     */
    055    @Override
    056    public void accept( final Visitor v ) {
    057        v.visitStackProducer(this);
    058        v.visitPushInstruction(this);
    059        v.visitTypedInstruction(this);
    060        v.visitLocalVariableInstruction(this);
    061        v.visitLoadInstruction(this);
    062    }
    063}