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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
 * 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
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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),
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 * 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
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package com.oracle.truffle.sl.runtime;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.strings.TruffleString;
import com.oracle.truffle.sl.SLLanguage;
import com.oracle.truffle.sl.nodes.SLEvalRootNode;
import com.oracle.truffle.sl.nodes.SLRootNode;

public final class SLStrings {

    public static final TruffleString EMPTY_STRING = constant("");
    public static final TruffleString NULL = constant("NULL");
    public static final TruffleString NULL_LC = constant("null");
    public static final TruffleString MAIN = constant("main");
    public static final TruffleString HELLO = constant("hello");
    public static final TruffleString WORLD = constant("world");

    public static TruffleString constant(String s) {
        return fromJavaString(s);
    }

    public static TruffleString fromJavaString(String s) {
        return TruffleString.fromJavaStringUncached(s, SLLanguage.STRING_ENCODING);
    }

    public static TruffleString fromObject(Object o) {
        if (o == null) {
            return NULL_LC;
        }
        if (o instanceof TruffleString) {
            return (TruffleString) o;
        }
        return fromJavaString(o.toString());
    }

    public static TruffleString getSLRootName(RootNode rootNode) {
        if (rootNode instanceof SLRootNode) {
            return ((SLRootNode) rootNode).getTSName();
        } else if (rootNode instanceof SLEvalRootNode) {
            return SLEvalRootNode.getTSName();
        } else {
            throw CompilerDirectives.shouldNotReachHere();
        }
    }
}