/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.bcel.generic;

/**
 * Denotes an unparameterized instruction to load a value from a local variable, for example ILOAD.
 */
public abstract class LoadInstruction extends LocalVariableInstruction implements PushInstruction {

    /**
     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise. tag and length are defined in
     * readInstruction and initFromFile, respectively.
     */
    LoadInstruction(final short canonTag, final short cTag) {
        super(canonTag, cTag);
    }

    /**
     * Constructs a LoadInstruction.
     *
     * @param opcode Instruction opcode.
     * @param cTag Instruction number for compact version, ALOAD_0, for example.
     * @param n local variable index (unsigned short).
     */
    protected LoadInstruction(final short opcode, final short cTag, final int n) {
        super(opcode, cTag, n);
    }

    /**
     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
     * methods according to the class hierarchy in descending order, that is, the most specific visitXXX() call comes last.
     *
     * @param v Visitor object.
     */
    @Override
    public void accept(final Visitor v) {
        v.visitStackProducer(this);
        v.visitPushInstruction(this);
        v.visitTypedInstruction(this);
        v.visitLocalVariableInstruction(this);
        v.visitLoadInstruction(this);
    }
}
