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Truffle SL is an example language implemented using the Truffle API.
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/*
 * Copyright (c) 2012, 2014, 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
 * 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 com.oracle.truffle.sl.nodes;

import java.io.*;

import com.oracle.truffle.api.frame.*;
import com.oracle.truffle.api.instrument.ProbeNode.WrapperNode;
import com.oracle.truffle.api.nodes.*;
import com.oracle.truffle.api.source.*;
import com.oracle.truffle.sl.nodes.instrument.*;

/**
 * The base class of all Truffle nodes for SL. All nodes (even expressions) can be used as
 * statements, i.e., without returning a value. The {@link VirtualFrame} provides access to the
 * local variables.
 */
@NodeInfo(language = "Simple Language", description = "The abstract base node for all statements")
public abstract class SLStatementNode extends Node {

    public SLStatementNode(SourceSection src) {
        super(src);
    }

    /**
     * Execute this node as as statement, where no return value is necessary.
     */
    public abstract void executeVoid(VirtualFrame frame);

    public SLStatementNode getNonWrapperNode() {
        return this;
    }

    @Override
    public String toString() {
        return formatSourceSection(this);
    }

    /**
     * Formats a source section of a node in human readable form. If no source section could be
     * found it looks up the parent hierarchy until it finds a source section. Nodes where this was
     * required append a '~' at the end.
     *
     * @param node the node to format.
     * @return a formatted source section string
     */
    public static String formatSourceSection(Node node) {
        if (node == null) {
            return "";
        }
        SourceSection section = node.getSourceSection();
        boolean estimated = false;
        if (section == null) {
            section = node.getEncapsulatingSourceSection();
            estimated = true;
        }

        if (section == null || section.getSource() == null) {
            return "";
        } else {
            String sourceName = new File(section.getSource().getName()).getName();
            int startLine = section.getStartLine();
            return String.format("%s:%d%s", sourceName, startLine, estimated ? "~" : "");
        }
    }

    @Override
    public boolean isInstrumentable() {
        return true;
    }

    @Override
    public WrapperNode createWrapperNode() {
        return new SLStatementWrapperNode(this);
    }

}