Yes, every imported identifier from a module that was compiled with
optimisations should have the proper analysis information in its IdInfo.
So if you have `base` somewhere in one of your compiled libraries and
load it, then the identifier of `GHC.OldList.map` will have an
`idDmdSig` that says it's strict in the list parameter.
At least that's how it works in GHC, where these IdInfos are populated
with the information from the loaded interface files. The situation with
HLS might be different, although I wouldn't expect that.
------ Originalnachricht ------
Von: "Alejandro Serrano Mena" <trup...@gmail.com>
An: "Sebastian Graf" <sgraf1...@gmail.com>
Cc: "GHC developers" <ghc-devs@haskell.org>; "Matthew Pickering"
<matthewtpicker...@gmail.com>
Gesendet: 13.01.2022 16:43:50
Betreff: Re: Re[2]: Strictness/demand info for a Name
Thanks for the pointers! :)
Knowing this, let me maybe rephrase my question: is it possible to get
demand information of identifiers without running the analysis itself?
Alejandro
El 13 ene 2022 15:45:29, Sebastian Graf <sgraf1...@gmail.com> escribió:
Yes, Matt is right.
`dmdSigInfo` describes the how a function Id uses its arguments and
free
variables, whereas
`demandInfo` describes how a (local, mostly) Id is used.
Note that if you wanted to go beyond type-checking, you could probably
run the analysis on the desugaring of the current module quite easily.
But the results would be misleading, as prior optimisations (that you
probably don't want to run) may arrange the program in a way that
demand
analysis has an easier time.
------ Originalnachricht ------
Von: "Matthew Pickering" <matthewtpicker...@gmail.com>
An: "Alejandro Serrano Mena" <trup...@gmail.com>
Cc: "GHC developers" <ghc-devs@haskell.org>
Gesendet: 13.01.2022 15:38:29
Betreff: Re: Strictness/demand info for a Name
You look at `dmdSigInfo` in `IdInfo`.
Matt
On Thu, Jan 13, 2022 at 2:20 PM Alejandro Serrano Mena
<trup...@gmail.com> wrote:
>
> Dear all,
>
> I’m trying to bring the information about demand and strictness to
the Haskell Language Server, but I cannot find a way to do so. I was
wondering whether you could help me :)
>
> Here’s my understanding; please correct me if I’m wrong:
>
> The analysis runs on Core, so getting this information for the
current file would require to run the compiler further than type
checking, which is quite expensive,
> However, this analysis should somehow use known information about
imported functions, which should be readily available somewhere,
> If the above is true, what is the simplest way to get the
information for imported things? As I mentioned above, I would prefer
not to run the compiler further than the type checking phase, since
otherwise it gets too expensive for IDE usage. Right now HLS uses the
information from the .hie files.
>
>
> In fact, this goes into the more general question of how to show
information from different analyses within the IDE; I guess solving
the case for strictness/analysis may open the door to more (maybe
everything recorded inside a `Id`?)
>
> Regards,
> Alejandro
> _______________________________________________
> ghc-devs mailing list
>ghc-devs@haskell.org
>http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
_______________________________________________
ghc-devs mailing list
ghc-devs@haskell.org
http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
_______________________________________________
ghc-devs mailing list
ghc-devs@haskell.org
http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
