No, debugger, actually doing a primitive call,
but in order to intercept a primitive failure and 'step into' method,
it does the trick
with replacing the subject method with temporary method (which will
call the same primitive with same arguments & recevier).
Then, if primitive runs ok, it simply behaves as a 'step over',
and if primitive fails, then debugger itercepts it and creates a
context for subject method, which should handle primitive failure.

On 19 July 2010 19:22, Schwab,Wilhelm K <bschwab at anest.ufl.edu> wrote:
> So the external call does not happen and the fall-back code executes.  That explains it.  It might be nice if FFI calls could be made to happen, or at least to have a more informative error message, such as "Primitive not executed by the debugger" rather than "Unable to find function address."
>
> Bill
>
>
>
>
> ________________________________________
> From: pharo-project-bounces at lists.gforge.inria.fr [pharo-project-bounces at lists.gforge.inria.fr] On Behalf Of Levente Uzonyi [leves at elte.hu]
> Sent: Monday, July 19, 2010 12:20 PM
> To: Pharo-project at lists.gforge.inria.fr
> Subject: Re: [Pharo-project] Debug-it and external calls
>
> On Mon, 19 Jul 2010, Schwab,Wilhelm K wrote:
>
>> I often (not always??) find that using the Debug-it command and debugging into an external call (FFI) leads to a false claim of "Unable to find function address."  Stepping over the call works; stepping into it make it look like it fails.
>>
>> I am curently using a 1.1 RC2 image and the 4.0.3 vm on Ubuntu.  I cannot easily move the offending code to Windows, nor do I particularly care to do so (feels good<g>), and FFI is fairly uncommon in Squeak/Pharo.
>>
>> Can anyone else tinker with this to see if it is real?
>
> IIRC when you're using the debugger, primitives are not evaluated.
>
>
> Levente
>
>>
>> Bill
>>
>>
>> _______________________________________________
>> Pharo-project mailing list
>> Pharo-project at lists.gforge.inria.fr
>> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
>>
>
> _______________________________________________
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> Pharo-project at lists.gforge.inria.fr
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>



-- 
Best regards,
Igor Stasenko AKA sig.