Re: Strange behaviour on stepping.

James Ross wrote:
> Dassburger wrote:
> > Hello!
> >
> > One more question from me. Suppose we have the following script:
> >
> > ===================================================
> > 1:   var x = 5;
> > 2:
> > 3:   Log.WriteLine('1');
> > 4:
> > 5:   x = x + 2;
> > 6:
> > 7:   var y = x + 3;
> > 8:   Log.WriteLine('2');
> > ===================================================
> >
> > First, I set an execution hook at line 1, start the script. Then I add
> > an interrupt hook and return from execution hook handler. I see a
> > strange behaviour. SpiderMonkey seems to pass the script twice, first,
> > it only stops at lines 1 and 7. Then it starts to execute the script as
> > usual, line by line: 3, 5, 7, 8.
>
> Is that the exact script used? I ask because if you have functions, you
> will get an execution hook for each function declaration in the
> top-level script as that is run (even if there's no code outside functions).

This is the exact test script. I already noticed the behaviour of JSD
when it meets functions. It, surely, will make a user to scratch
his/her head a little bit, but we can live with it.

> If it is the exact script used, can you try dumping all the PC values
> through a single run? I'm interested in whether the places it stops on
> line 1 and 7 are PC values that it hits again during the 'real' run.

They differ. For example, pass 1 gives such:

1: 80640600
7: 80640603

and pass 2 gives such:

1: 80640606
7: 80640644

The sequence of calls JSD_GetPCForStackFrame() -> JSD_GetClosestLine()
however returns line numbers 1 and 7 on both passes.

> -- 
> James Ross <[email protected]>
> ChatZilla Developer