[Cuis-dev] How to stop exception triggering code in its tracks?

[Alexandre Rousseau]

Thanks. And ... thanks for the new lets-not-shoot-ourselves-in-the-foot
update. :)

On Mon, Mar 13, 2023 at 6:56 PM Juan Vuletich <juan at cuis.st> wrote:

> On 3/13/2023 6:05 PM, Alexandre Rousseau via Cuis-dev wrote:
>
> This helps, thanks. I am at least able to freeze things.
>
> Going further ... executing this in a workspace:
>
> b := BoxedMorph new.
>> b addMorph: b.
>> b openInHand.
>
>
> the pointer disappears (infinite redraw), I press cmd-. and the debugger
> (User Interrupt) appears.
>
> Is there any way, at that point, to restore VM state to that point prior
> to (faulty) code execution (as in, cancel last 2 messages, #addMorph: and
> #openInHand) ?
>
>
> Yes. Just close the debugger. The garbage collector will do the rest.
>
> Anyway, just pushed an update that prevents a morph becoming its own
> submorph.
>
> Cheers,
>
>
>
>
> On Mon, Mar 13, 2023 at 4:20 PM Juan Vuletich <juan at cuis.st> wrote:
>
>> On 3/13/2023 1:23 PM, Alexandre Rousseau via Cuis-dev wrote:
>> > I accidentally introduced a bug in my class instance initialization
>> > code (adding a submorph to itself). When instantiating my class, the
>> > debugger appeared but seemed impossible to interact with while the
>> > task bar rapidly filled up with more such debugger representations.
>> >
>> > Unable to deal with this, I killed my cuis environment, losing 30
>> > minutes of work.
>> >
>> > What do you do when faced with runaway exceptions? Is there some
>> > keyboard action once can perform to stop the execution of it?
>>
>> It depends on where the exception is raised. If it is in #drawOn:, we
>> already have a recovery mechanism. In some other cases, cmd-. (the
>> interrupt key) let's you recover control. But the whole system is
>> implemented in Smalltalk. There will always be ways to break code in a
>> way that you can't get to a working UI again. As rabbit already said,
>> that's why there are several files where your code is logged, so you can
>> recover it.
>>
>> HTH,
>>
>> --
>> Juan Vuletich
>> cuis.st
>> github.com/jvuletich
>> researchgate.net/profile/Juan-Vuletich
>> independent.academia.edu/JuanVuletich
>> patents.justia.com/inventor/juan-manuel-vuletich
>> linkedin.com/in/juan-vuletich-75611b3
>> twitter.com/JuanVuletich
>>
>>
>
> --
> Juan Vuletichcuis.stgithub.com/jvuletichresearchgate.net/profile/Juan-Vuletichindependent.academia.edu/JuanVuletichpatents.justia.com/inventor/juan-manuel-vuletichlinkedin.com/in/juan-vuletich-75611b3twitter.com/JuanVuletich
>
>
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