INTERNAL
Oh, and one more question. This all works if in `Test.hs` I use a package
import for `MyLib`. However, if I remove that, I get an error
attempting to use module ‘main:MyLib’ (input/MyLib.hs) which is not
loaded
So I tried adding an ExposePackage to the DynFlags's packageFlags between
loading the library and typechecking `Test.hs`, but I couldn't get that to work:
1. If I just set it in the `hsc_dflags`, it doesn't take.
2. If I use `initUnits` after setting it in `hsc_dflags`, I get a new error:
cannot satisfy my-pkg
-----Original Message-----
From: Erdi, Gergo
Sent: Monday, June 28, 2021 2:41 PM
To: Matthew Pickering <[email protected]>
Cc: [email protected]
Subject: RE: [External] Re: Loading a typechecked module and then using it
immediately as a package
INTERNAL
Thanks, I got this working (after changing it slightly to use the GHC 9.0 API
to the UnitState). However, I have some followup questions:
1. In the fakeUnitInfo, what is the relationship between unitLibraries and
unitExposedModules?
2. In the fakeUnitInfo, what is the unitImportDirs used for?
3. What is the difference between a PackageId and a PackageName?
Other than that, the code registers MyLib into the my-pkg package by letting
`load` do the actual heavy lifting. For my purposes, I will need to control
this loading myself: only `MyLib`'s typechecked interface should be used, with
no actual compilation of definitions. So I wrote some code that makes a
ModIface from a TcGblEnv. I seemingly got the whole thing working just by
setting mi_exports from the TcGblEnv and leaving everything else with trivial
values (fingerprint0 for fingerprints, empty lists for instances, etc.). If
`MyLib` has no external dependencies and doesn't define any typeclasses,
instances, or type families, is this enough? What is the role of `mi_globals`,
should I set that from `tcg_rdr_env`, or should I leave it empty?
Thanks,
Gergo
-----Original Message-----
From: Matthew Pickering <[email protected]>
Sent: Friday, June 25, 2021 6:54 PM
To: Erdi, Gergo <[email protected]>
Cc: [email protected]
Subject: [External] Re: Loading a typechecked module and then using it
immediately as a package
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Bank and our clients.
Hi Gergo,
Please see a minimal example in this gist.
https://clicktime.symantec.com/3Eb2qXqu8Yp6VtdK9d5pNmL7Vc?u=https%3A%2F%2Fgist.github.com%2Fmpickering%2F5029c7f244c484c91d665bcbc6bc6406
Cheers,
Matt
On Fri, Jun 25, 2021 at 10:20 AM Erdi, Gergo via ghc-devs
<[email protected]> wrote:
>
> PUBLIC
>
>
> Hi,
>
>
>
> I have the following to .hs files:
>
>
>
> MyLib.hs:
>
> module MyLib where
> …
>
> Test.hs:
>
> {-# LANGUAGE PackageImports #-}
> module Test where
> import “my-pkg” MyLib
> …
>
>
>
> I would like to parse/typecheck/load MyLib.hs into some Unit “my-unit”, then
> add that to the package “my-pkg”, and then typecheck Test.hs, all in-proc
> using the GHC API, without putting any other files on disk. How do I do that?
>
>
>
> What I tried is loading MyLib.hs after setting the homeUnitId in the DynFlags
> to “my-unit”, then editing the packageNameMap in the unitState of the
> DynFlags to may “my-pkg” to “my-unit”:
>
> setHomeUnit :: (GhcMonad m) => UnitId -> m ()
>
> setHomeUnit unitId = do
>
> dflags <- getSessionDynFlags
>
> modifySession $ \h -> h{ hsc_dflags = dflags{ homeUnitId = unitId
> } }
>
>
>
> registerUnit :: (GhcMonad m) => PackageName -> UnitId -> m ()
>
> registerUnit pkg unitId = modifySession $ \h -> h{ hsc_dflags =
> addUnit $ hsc_dflags h }
>
> where
>
> addUnit dflags = dflags
>
> { unitState = let us = unitState dflags in us
>
> { packageNameMap = M.insert pkg (Indefinite unitId
> Nothing) $ packageNameMap us
>
> }
>
> }
>
>
>
> pipeline = do
>
> setHomeUnit myUnit
>
> loadModule =<< typecheckModule =<< parseModule =<< modSumarryFor
> “MyLib”
>
> registerUnit myPkg myUnit
>
>
>
> setHomeUnit mainUnitId
>
> typecheckModule =<< parseModule =<< modSumarryFor “Test”
>
>
>
>
>
> Alas, this doesn’t work: the import of `MyLib` from `my-pkg` fails with:
>
>
>
> input/linking/Test.hs:5:1: error:
>
> Could not find module ‘MyLib’
>
> It is not a module in the current program, or in any known package.
>
>
>
> TBH I’m not very surprised that it didn’t work – that registerUnit function
> is doing some pretty deep surgery on the unitState that probably breaks
> several invariants. Still, I wasn’t able to find a better way – all the
> functions in GHC.Unit.State seem to be for querying only.
>
>
>
> Thanks,
>
> Gergo
>
>
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Where you have a Financial Markets relationship with Standard Chartered PLC,
Standard Chartered Bank and their subsidiaries (the "Group"), information on
the regulatory standards we adhere to and how it may affect you can be found in
our Regulatory Compliance Statement at https: //www.sc.com/rcs/ and Regulatory
Compliance Disclosures at http: //www.sc.com/rcs/fm
Insofar as this communication is not sent by the Global Research team and
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purpose only and shall not be relied on for any other purpose and is subject to
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