Will source context be available? The debugger needs to know that function
xyz is being called from the RHS of a specific rule (it may also be that
function xyz is called from multiple lines of code in a given RHS.) This
information is needed in order need to display the source code and current
line of execution.
As noted in the readme file:
"In this release, there is only one event class, one listener interface, and
one callback method which covers all possibilities. This is likely to change
in the future."
I hate to suggest more work but could a new event and/or listener interface
be introduced to support source level debugging? Such a feature would
presumably be used only by debuggers and, as such, performance degradation
would be expected. I would think that in the non-debug case, checking for
non-existent listeners would be fairly inexpensive.
I am willing to prototype such a beast but only if there is at least a slim
chance that the changes will make it into a Jess release (I hate writing and
debugging throw away code.)
alanm
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On
> Behalf Of Ernest Friedman-Hill
> Sent: Tuesday, February 16, 1999 6:12 PM
> To: [EMAIL PROTECTED]
> Subject: Re: JESS: Debugger Event Notifications
>
>
> I played with the idea of having a 'function called' event, but it is
> too computationally expensive. There's a very noticeable slowdown, of
> the order of 25% or so, with even a few listeners.
>
> Instead, the next release of Jess will have a feature called
> 'defadvice'. Defadvice lets you attach code to a Jess function to be
> called before or after that function runs. There will be an option to
> advice all functions at once, too. In any case, you'll be able to
> advice all funtions with a generic debugger stub, which will let you
> do what ypu want.
>
> The advantage of this method is that it adds no overhead at all,
> unless you use it, of course.
>
> I think Alan Moore wrote:
> >
> > I am building a debugger for jess but cannot find a way to enable single
> > step debugging (assuming that "single step" means that the
> debugger can step
> > through the function calls/control structures on the RHS of a rule.)
> >
> > The closest thing that I can find is the DEFRULE_FIRED event
> but it is not
> > granular enough.
> >
> > Would it be possible to fire an event inside the Funcall class,
> possibly in
> > execute() or simpleExecute()? Ideally, the source context
> (stream?) would
> > be made available with the event but I would settle for whatever I can
> > get...
> >
> > If necessary, I can make the modifications myself and give them
> to you for
> > validation and integration into your sources.
> >
> > Suggestions?
> >
> > alanm
> >
> > Alan Moore (mailto:[EMAIL PROTECTED])
> > Quadrant International (http://www.qi.com)
> >
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> >
> >
>
>
> ---------------------------------------------------------
> Ernest Friedman-Hill
> Distributed Systems Research Phone: (925) 294-2154
> Sandia National Labs FAX: (925) 294-2234
> Org. 8920, MS 9214 [EMAIL PROTECTED]
> PO Box 969 http://herzberg.ca.sandia.gov
> Livermore, CA 94550
>
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