Subj : Re: Step-by-step execution...
To   : Corey Murtagh <emonk@slingshot.co.nz.no.uce>
From : Brendan Eich <brendan@meer.net>
Date : Fri May 23 2003 11:36 pm

> To clarify: we need to have the script pause at the end of ANY 
> statement, so this code:
> 
> var sum = 0;
> var count = 0;
>   for (var i = 0; i < 10; i++)
>   {
>     sum += i;
>     count++;
>   }
> 
> ...would break at least on the 'var...',  'sum += i' and 'count++' 
> statements, and preferably at least once per pass through the for loop 
> (before or after evaluating the condition).
> 
> Is it currently possible to do this with SpiderMonkey?  If not, does 
> anyone have any thoughts on how hard it would be to adapt SpiderMonkey 
> to this task?
> 
> I really would like to use SM, I just need to get it to jump through 
> hoops the way we tell it to :>
> 

Have you used Venkman (the JS debugger, built on SpiderMonkey -- it 
supports single-statement stepping among other things), or checked out 
the JS debugger APIs?

http://www.mozilla.org/projects/venkman/
http://lxr.mozilla.org/mozilla/source/js/src/jsdbgapi.h
http://lxr.mozilla.org/mozilla/source/js/jsd/

I'm cc'ing Rob Ginda, creator of Venkman, who can probably say more.

/be

.