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
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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