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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
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.oracle.truffle.sl.nodes.controlflow;

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

/**
 * A statement node that just executes a list of other statements.
 */
@NodeInfo(shortName = "block", description = "The node implementing a source code block")
public final class SLBlockNode extends SLStatementNode {

    /**
     * The array of child nodes. The annotation {@link com.oracle.truffle.api.nodes.Node.Children
     * Children} informs Truffle that the field contains multiple children. It is a Truffle
     * requirement that the field is {@code final} and an array of nodes.
     */
    @Children private final SLStatementNode[] bodyNodes;

    public SLBlockNode(SourceSection src, SLStatementNode... bodyNodes) {
        super(src);
        this.bodyNodes = bodyNodes;
    }

    /**
     * Execute all child statements. The annotation {@link ExplodeLoop} triggers full unrolling of
     * the loop during compilation. This allows the {@link SLStatementNode#executeVoid} method of
     * all children to be inlined.
     */
    @Override
    @ExplodeLoop
    public void executeVoid(VirtualFrame frame) {
        /*
         * This assertion illustrates that the array length is really a constant during compilation.
         */
        CompilerAsserts.compilationConstant(bodyNodes.length);

        for (SLStatementNode statement : bodyNodes) {
            statement.executeVoid(frame);
        }
    }
}