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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) 2016, 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
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package com.oracle.truffle.api.instrumentation;

import com.oracle.truffle.api.nodes.Node;

/**
 * Factory for creating wrapper nodes. The instrumentation framework inserts a wrapper
 * between an {@link Instrumentable} guest language node (called the delegate) and its
 * parent for the purpose of interposing on execution events at the delegate and reporting those
 * events to the instrumentation framework.
 * 
 * 
 * Wrapper implementations can be generated automatically: see the {@link Instrumentable}
 * annotation.
 *
 * @param  the type of delegate node this factory operates on
 * @since 0.12
 */
public interface InstrumentableFactory {

    /**
     * Returns a new, never adopted, unshared {@link WrapperNode wrapper} node implementation for a
     * particular {@link Instrumentable} node of the guest language AST called its delegate
     * . The returned wrapper implementation must extend the same type that is annotated with
     * {@link Instrumentable}.
     * 
     * 
     * A wrapper forwards the following events concerning the delegate to the given {@link ProbeNode
     * probe} for propagation through the instrumentation framework, e.g. to
     * {@linkplain ExecutionEventListener event listeners} bound to this guest language program
     * location:
     * 

     * {@linkplain ProbeNode#onEnter(com.oracle.truffle.api.frame.VirtualFrame) onEnter(Frame)}:
     * an execute method on the delegate is ready to be called;
     * {@linkplain ProbeNode#onReturnValue(com.oracle.truffle.api.frame.VirtualFrame, Object)
     * onReturnValue(Frame,Object)}: an execute method on the delegate has just returned a
     * (possibly null) value;
     * 
     * {@linkplain ProbeNode#onReturnExceptional(com.oracle.truffle.api.frame.VirtualFrame, Throwable)
     * onReturnExceptional(Frame,Throwable)}: an execute method on the delegate has just
     * thrown an exception.
     * 
     * 
     *
     * @param node the {@link Instrumentable} delegate to be adopted by the wrapper
     * @param probe the {@link ProbeNode probe node} to be adopted and sent execution events by the
     *            wrapper
     * @return a {@link WrapperNode wrapper} implementation
     * @since 0.12
     */
    WrapperNode createWrapper(T node, ProbeNode probe);

    /**
     * Nodes that the instrumentation framework inserts into guest language ASTs (between
     * {@link Instrumentable} guest language nodes and their parents) for the purpose of interposing
     * on execution events and reporting them via the instrumentation framework.
     *
     * @see #createWrapper(Node, ProbeNode)
     * @since 0.12
     */
    public interface WrapperNode {

        /**
         * The {@link Instrumentable} guest language node, adopted as a child, whose execution
         * events the wrapper reports to the instrumentation framework.
         *
         * @since 0.12
         */
        Node getDelegateNode();

        /**
         * A child of the wrapper, through which the wrapper reports execution events related to the
         * guest language delegate node.
         *
         * @since 0.12
         */
        ProbeNode getProbeNode();

    }

}