/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.0 (the "NPL"); you may not use this file except in
 * compliance with the NPL.  You may obtain a copy of the NPL at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the NPL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
 * for the specific language governing rights and limitations under the
 * NPL.
 *
 * The Initial Developer of this code under the NPL is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
 * Reserved.
 */

package netscape.jsdebug;

/**
* This interface provides access to the execution stack of a thread.
* It has several subclasses to distinguish between different kinds of
* stack frames: these currently include activations of Java methods
* or JavaScript functions.
* It is possible that synchronize blocks and try blocks deserve their own
* stack frames - to allow for later extensions a debugger should skip over
* stack frames it doesn't understand.
* Note that this appears very Java-specific.  However, multiple threads and
* exceptions are relevant to JavaScript as well because of its
* interoperation with Java.
*
* @author  John Bandhauer
* @version 1.0
* @since   1.0
*/
public final class JSStackFrameInfo extends StackFrameInfo
{
    public JSStackFrameInfo(JSThreadState threadState) {
        super(threadState);
    }

    protected native StackFrameInfo getCaller0()
        throws InvalidInfoException;

    public native PC getPC()
        throws InvalidInfoException;

    public native Value getCallObject()
        throws InvalidInfoException;

    public native Value getScopeChain()
        throws InvalidInfoException;

    public native Value getThis()
        throws InvalidInfoException;

    private int     _nativePtr;     // used internally
}

