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Truffle SL is an example language implemented using the Truffle API.
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/*
 * Copyright (c) 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
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * 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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 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * 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.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.library.CachedLibrary;
import com.oracle.truffle.api.library.ExportLibrary;
import com.oracle.truffle.api.library.ExportMessage;
import com.oracle.truffle.api.library.Message;
import com.oracle.truffle.api.library.ReflectionLibrary;
import com.oracle.truffle.api.nodes.NodeInfo;

/**
 * Builtin function to wrap primitive values in order to increase coverage of the Truffle TCK test.
 */
@NodeInfo(shortName = "wrapPrimitive")
@SuppressWarnings("unused")
public abstract class SLWrapPrimitiveBuiltin extends SLBuiltinNode {

    @TruffleBoundary
    @Specialization
    public Object doDefault(Object value) {
        if (value instanceof PrimitiveValueWrapper) {
            return value;
        } else {
            return new PrimitiveValueWrapper(value);
        }
    }

    @ExportLibrary(ReflectionLibrary.class)
    static final class PrimitiveValueWrapper implements TruffleObject {

        final Object delegate;

        PrimitiveValueWrapper(Object delegate) {
            this.delegate = delegate;
        }

        @ExportMessage
        Object send(Message message, Object[] args,
                        @CachedLibrary("this.delegate") ReflectionLibrary reflection) throws Exception {
            return reflection.send(this.delegate, message, args);
        }

    }

}