/*
 * Tai-e: A Static Analysis Framework for Java
 *
 * Copyright (C) 2022 Tian Tan <tiantan@nju.edu.cn>
 * Copyright (C) 2022 Yue Li <yueli@nju.edu.cn>
 *
 * This file is part of Tai-e.
 *
 * Tai-e is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 *
 * Tai-e is distributed in the hope that it will be useful,but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
 * Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Tai-e. If not, see <https://www.gnu.org/licenses/>.
 */

package pascal.taie.ir.exp;

import pascal.taie.language.type.PrimitiveType;

/**
 * Representation of shift expression, e.g., a >> b.
 */
public class ShiftExp extends AbstractBinaryExp {

    public enum Op implements BinaryExp.Op {

        SHL("<<"),
        SHR(">>"),
        USHR(">>>"),
        ;

        private final String symbol;

        Op(String symbol) {
            this.symbol = symbol;
        }

        @Override
        public String toString() {
            return symbol;
        }
    }

    private final Op op;

    public ShiftExp(Op op, Var value1, Var value2) {
        super(value1, value2);
        this.op = op;
    }

    @Override
    protected void validate() {
        assert Exps.holdsInteger(operand1) && Exps.holdsInt(operand2);
    }

    @Override
    public Op getOperator() {
        return op;
    }

    @Override
    public PrimitiveType getType() {
        return (PrimitiveType) operand1.getType();
    }

    @Override
    public <T> T accept(ExpVisitor<T> visitor) {
        return visitor.visit(this);
    }
}
