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Truffle is a multi-language framework for executing dynamic languages that achieves high performance when combined with Graal.

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/*
 * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.oracle.truffle.api.nodes;

import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * Information about a {@link Node} class. A single instance of this class is allocated for every
 * subclass of {@link Node} that is used.
 *
 * @since 0.8 or earlier
 */
public abstract class NodeClass {
    private static final ClassValue nodeClasses = new ClassValue() {
        @Override
        protected NodeClass computeValue(final Class clazz) {
            return AccessController.doPrivileged(new PrivilegedAction() {
                public NodeClass run() {
                    return new NodeClassImpl(clazz.asSubclass(Node.class));
                }
            });
        }
    };

    /** @since 0.8 or earlier */
    public static NodeClass get(Class clazz) {
        return nodeClasses.get(clazz);
    }

    /** @since 0.8 or earlier */
    public static NodeClass get(Node node) {
        return node.getNodeClass();
    }

    /** @since 0.8 or earlier */
    public NodeClass(@SuppressWarnings("unused") Class clazz) {
    }

    /** @since 0.8 or earlier */
    @SuppressWarnings("deprecation")
    @Deprecated
    public NodeFieldAccessor getNodeClassField() {
        return null;
    }

    /** @since 0.8 or earlier */
    @SuppressWarnings("deprecation")
    @Deprecated
    public NodeFieldAccessor[] getCloneableFields() {
        return null;
    }

    /** @since 0.8 or earlier */
    @SuppressWarnings("deprecation")
    @Deprecated
    public NodeFieldAccessor[] getFields() {
        return null;
    }

    /** @since 0.8 or earlier */
    @SuppressWarnings("deprecation")
    @Deprecated
    public NodeFieldAccessor getParentField() {
        return null;
    }

    /** @since 0.8 or earlier */
    @SuppressWarnings("deprecation")
    @Deprecated
    public NodeFieldAccessor[] getChildFields() {
        return null;
    }

    /** @since 0.8 or earlier */
    @SuppressWarnings("deprecation")
    @Deprecated
    public NodeFieldAccessor[] getChildrenFields() {
        return null;
    }

    /** @since 0.8 or earlier */
    public Iterator makeIterator(Node node) {
        List