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Truffle SL is an example language implemented using the Truffle API.
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/*
 * Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
 * 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
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (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.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * SOFTWARE.
 */
package com.oracle.truffle.sl.builtins;

import com.oracle.truffle.api.dsl.GenerateNodeFactory;
import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.UnsupportedSpecializationException;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.UnexpectedResultException;
import com.oracle.truffle.sl.SLException;
import com.oracle.truffle.sl.nodes.SLExpressionNode;
import com.oracle.truffle.sl.runtime.SLContext;
import com.oracle.truffle.sl.runtime.SLFunctionRegistry;

/**
 * Base class for all builtin functions. It contains the Truffle DSL annotation {@link NodeChild}
 * that defines the function arguments.

 * The builtin functions are registered in {@link SLContext#installBuiltins}. Every builtin node
 * subclass is instantiated there, wrapped into a function, and added to the
 * {@link SLFunctionRegistry}. This ensures that builtin functions can be called like user-defined
 * functions; there is no special function lookup or call node for builtin functions.
 */
@NodeChild(value = "arguments", type = SLExpressionNode[].class)
@GenerateNodeFactory
public abstract class SLBuiltinNode extends SLExpressionNode {

    @Override
    public final Object executeGeneric(VirtualFrame frame) {
        try {
            return execute(frame);
        } catch (UnsupportedSpecializationException e) {
            throw SLException.typeError(e.getNode(), e.getSuppliedValues());
        }
    }

    @Override
    public final boolean executeBoolean(VirtualFrame frame) throws UnexpectedResultException {
        return super.executeBoolean(frame);
    }

    @Override
    public final long executeLong(VirtualFrame frame) throws UnexpectedResultException {
        return super.executeLong(frame);
    }

    @Override
    public final void executeVoid(VirtualFrame frame) {
        super.executeVoid(frame);
    }

    protected abstract Object execute(VirtualFrame frame);
}