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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 com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.*;
import com.oracle.truffle.api.frame.*;
import com.oracle.truffle.api.instrument.*;
import com.oracle.truffle.api.nodes.*;
import com.oracle.truffle.sl.builtins.*;
import com.oracle.truffle.sl.nodes.controlflow.*;
import com.oracle.truffle.sl.runtime.*;

/**
 * The root of all SL execution trees. It is a Truffle requirement that the tree root extends the
 * class {@link RootNode}. This class is used for both builtin and user-defined functions. For
 * builtin functions, the {@link #bodyNode} is a subclass of {@link SLBuiltinNode}. For user-defined
 * functions, the {@link #bodyNode} is a {@link SLFunctionBodyNode}.
 */
@NodeInfo(language = "Simple Language", description = "The root of all Simple Language execution trees")
public final class SLRootNode extends RootNode {

    /** The function body that is executed, and specialized during execution. */
    @Child private SLExpressionNode bodyNode;

    /** The name of the function, for printing purposes only. */
    private final String name;

    /** The Simple execution context for this tree. **/
    private final SLContext context;

    @CompilationFinal private boolean isCloningAllowed;

    public SLRootNode(SLContext context, FrameDescriptor frameDescriptor, SLExpressionNode bodyNode, String name) {
        super(null, frameDescriptor);
        this.bodyNode = bodyNode;
        this.name = name;
        this.context = context;
    }

    @Override
    public Object execute(VirtualFrame frame) {
        return bodyNode.executeGeneric(frame);
    }

    public String getName() {
        return name;
    }

    public void setCloningAllowed(boolean isCloningAllowed) {
        this.isCloningAllowed = isCloningAllowed;
    }

    public SLExpressionNode getBodyNode() {
        return bodyNode;
    }

    @Override
    public boolean isCloningAllowed() {
        return isCloningAllowed;
    }

    @Override
    public void applyInstrumentation() {
        Probe.applyASTProbers(bodyNode);
    }

    @Override
    public String toString() {
        return "root " + name;
    }

    public SLContext getSLContext() {
        return this.context;
    }

    @Override
    public ExecutionContext getExecutionContext() {
        return this.context;
    }
}