Re: JSD: Stepping by line

James Ross wrote:
> Currently, JSD gets called (InterruptHook) from SpiderMonkey for each 
> instruction executed in SpiderMonkey's compiled bytecode. That's not 
> going to change, but what people have shown concern about is that JSD 
> calls into its registered interrupt hook (usually JS) for each of these.
> 
> People claim that costs time.
> 
> It is interesting because it isn't just a trivial fix; Venkman, for 
> example, actually has two quite unlinked ways of counting lines (normal, 
> and pretty print [PP]). Of course, since PP is a specific feature of 
> JSD's exposed interfaces, one possibility to help is to give JSD a new 
> 3-way setting:
>  - oldskool (call for each instruction in SpiderMonkey)
>  - by line, normal (call/unique line by the normal PC->line map)
>  - by line, PP (call/unique line by the PP PC->line map)
> 
> Thoughts?
> 

It sounds like a plan to me, but then again, I don't know much about JSD 
- yet, or so I hope. You seem to be stressing that 'people claim' it 
costs time. Do you believe differently yourself? (I'm just being curious 
here; my own assumption would be that it does cost time, but as said I 
don't know JSD)

-- Gijs