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Truffle SL is an example language implemented using the Truffle API.

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/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
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 * This license is subject to the following condition:
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package com.oracle.truffle.sl.nodes.expression;

import com.oracle.truffle.api.nodes.NodeInfo;
import com.oracle.truffle.sl.nodes.SLExpressionNode;

/**
 * Logical disjunction node with short circuit evaluation.
 */
@NodeInfo(shortName = "||")
public final class SLLogicalOrNode extends SLShortCircuitNode {

    public SLLogicalOrNode(SLExpressionNode left, SLExpressionNode right) {
        super(left, right);
    }

    @Override
    protected boolean isEvaluateRight(boolean left) {
        return !left;
    }

    @Override
    protected boolean execute(boolean left, boolean right) {
        return left || right;
    }

}