[Cuis-dev] [Vm-dev] Cuis now runs with latest Cog, but I don't
understand the problem we had
Juan Vuletich
JuanVuletich at zoho.com
Thu Apr 28 19:46:34 UTC 2016
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
> <mailto: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
> <mailto: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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