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The latte-lang compiler project, which contains compiler and runtime required library.

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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 KuiGang Wang
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package lt.compiler.semantic;

/**
 * left value
 */
public interface LeftValue extends Value {
        /**
         * whether this value is a final value (`val` in Latte)
         *
         * @return true/false
         */
        boolean canChange();

        /**
         * check whether the value is already assigned
         *
         * @return true/false
         */
        boolean alreadyAssigned();

        /**
         * assign the value, change alreadyAssigned state to true.
         */
        void assign();

        /**
         * whether the value is referenced
         *
         * @return true if it's used
         */
        boolean isUsed();

        /**
         * mark the variable as used
         *
         * @param used true if it's used
         */
        void setUsed(boolean used);
}