/*
 * 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;

/**
 * Super class for stack operations like DUP and POP.
 */
public abstract class StackInstruction extends Instruction {

    /**
     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
     */
    StackInstruction() {
    }

    /**
     * Constructs a StackInstruction.
     *
     * @param opcode instruction opcode.
     */
    protected StackInstruction(final short opcode) {
        super(opcode, (short) 1);
    }

    /**
     * Gets the type.
     *
     * @param cp the constant pool.
     * @return Type.UNKNOWN.
     */
    public Type getType(final ConstantPoolGen cp) {
        return Type.UNKNOWN;
    }
}
