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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.

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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

// API class

package org.mozilla.javascript.debug;

import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;

/**
Interface to implement if the application is interested in receiving debug
information during execution of a particular script or function.
*/
public interface DebugFrame {

/**
Called when execution is ready to start bytecode interpretation for entered a particular function or script.

@param cx current Context for this thread
@param activation the activation scope for the function or script.
@param thisObj value of the JavaScript this object
@param args the array of arguments
*/
    public void onEnter(Context cx, Scriptable activation,
                        Scriptable thisObj, Object[] args);
/**
Called when executed code reaches new line in the source.
@param cx current Context for this thread
@param lineNumber current line number in the script source
*/
    public void onLineChange(Context cx, int lineNumber);

/**
Called when thrown exception is handled by the function or script.
@param cx current Context for this thread
@param ex exception object
*/
    public void onExceptionThrown(Context cx, Throwable ex);

/**
Called when the function or script for this frame is about to return.
@param cx current Context for this thread
@param byThrow if true function will leave by throwing exception, otherwise it
       will execute normal return
@param resultOrException function result in case of normal return or
       exception object if about to throw exception
*/
    public void onExit(Context cx, boolean byThrow, Object resultOrException);

/**
Called when the function or script executes a 'debugger' statement.
@param cx current Context for this thread
*/
    public void onDebuggerStatement(Context cx);
}