[Cuis-dev] [Vm-dev] Cuis now runs with latest Cog, but I don't understand the problem we had

[Eliot Miranda]

Um, ignore that last message.  I see the problem staring me in the face.
Thanks for the fix, Nicolas.

On Sat, Apr 30, 2016 at 9:49 AM, Eliot Miranda <eliot.miranda at gmail.com>
wrote:

> Juan, Nicolas,
>
>     which versions are broken?  I want to see the source for the broken
> version, and so I'd like to know the svn revision number for a broken
> version.  I'll take them off my site.  I'll build new VMs and upload some
> time this weekend.
>
> On Thu, Apr 28, 2016 at 12:46 PM, Juan Vuletich <JuanVuletich at zoho.com>
> wrote:
>
>>
>> On 4/28/2016 4:39 PM, Nicolas Cellier via Cuis-dev wrote:
>>
>> Moreover, as long as you write primitive: 110 in cog, you don't invoke
>> primitive 110.
>> You rather invoke genPrimitiveIdentical.
>> Please try the snippet on a StackVM.
>>
>>
>> Sure. Can you provide a link to such VM? It should be based on
>> VMMaker.oscog-eem.1370/r3386 or later, as the problem doesn't happen with
>> any Cog older than that.
>>
>> Thanks,
>> Juan Vuletich
>>
>> genPrimitiveIdentical has been slightly refactored, but I see no obvious
>> problem by just reading code.
>> Moreover, when you use Object = you'll also call same methods in the
>> end...
>> This would deserve experimenting VMSimulator... (I don't have the Bochs
>> plugin working now)
>>
>> 2016-04-28 21:21 GMT+02:00 Nicolas Cellier <
>> nicolas.cellier.aka.nice at gmail.com>:
>>
>>> Hi Juan, then how do you explain:
>>>
>>> "Just to clarify: the issue was experienced only when running on Cog...
>>> current versions of the Stack VM performed as expected."
>>>
>>>
>>> 2016-04-28 21:10 GMT+02:00 Juan Vuletich <JuanVuletich at zoho.com>:
>>>
>>>>
>>>> On 4/28/2016 2:13 PM, Phil (list) wrote:
>>>>
>>>>>
>>>>> On Thu, 2016-04-28 at 12:58 -0400, Phil (list) wrote:
>>>>>
>>>>>> On Thu, 2016-04-28 at 16:43 +0200, Clément Bera wrote:
>>>>>>
>>>>>>>   Have you tried on latest VM ? I remembered fixing a bug on #==
>>>>>>> primitive like a month ago. The problem was when performing #==
>>>>>>> primitive with the argument being a forwarder to an immediate.
>>>>>>>
>>>>>>> The problem still existed as of Cog #3686 (Juan found the fix
>>>>>> yesterday.)  On my system, Cuis last worked perfectly with 3370,
>>>>>> mostly
>>>>>> worked with 3390, somewhat worked with 3427 and did not work after
>>>>>> that
>>>>>> until we found the Character>>#= bug/fix.
>>>>>>
>>>>> Just to clarify: the issue was experienced only when running on Cog...
>>>>> current versions of the Stack VM performed as expected.
>>>>>
>>>>
>>>> Fortunately I work with Gera Richarte @ Satellogic, and it didn't take
>>>> long for him to suggest an explanation: Maybe prim 110 is broken in recent
>>>> Cog VMs, but nobody notices it because the only sender is #== that is
>>>> already optimized by the jitter, so prim 110 is never really called. And I
>>>> realized we can test that theory. First, we add this method to Character:
>>>>
>>>> === aCharacter
>>>> <primitive: 110>
>>>>     self halt
>>>>
>>>> Then the following snippet (in latest Cuis, #2744):
>>>>
>>>>     0 to: 255 do: [ :i1 | 0 to: 255 do: [ :i2 | i1 = i2 ifFalse:
>>>> [(Character value: i1) === (Character value: i2) ifTrue: [{i1.i2} print ]]]]
>>>>
>>>> prints nothing if run with Cog 3370, but prints a lot of pairs in more
>>>> recent Cog. So I think Gera is right.
>>>>
>>>> Thanks,
>>>> Juan Vuletich
>>>>
>>>>
>>>
>>
>> _______________________________________________
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>>
>>
>>
>>
>
>
> --
> _,,,^..^,,,_
> best, Eliot
>



-- 
_,,,^..^,,,_
best, Eliot
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