module Vectorise.Type.Classify
( TyConGroup
, classifyTyCons
, tyConGroups)
where
import UniqSet
import UniqFM
import DataCon
import TyCon
import TypeRep
import Type
import Digraph
import Outputable
type TyConGroup = ([TyCon], UniqSet TyCon)
classifyTyCons
:: UniqFM Bool
-> [TyConGroup]
-> ([TyCon], [TyCon])
classifyTyCons = classify [] []
where
classify conv keep _ [] = (conv, keep)
classify conv keep cs ((tcs, ds) : rs)
| can_convert && must_convert
= classify (tcs ++ conv) keep (cs `addListToUFM` [(tc,True) | tc <- tcs]) rs
| can_convert
= classify conv (tcs ++ keep) (cs `addListToUFM` [(tc,False) | tc <- tcs]) rs
| otherwise
= classify conv keep cs rs
where
refs = ds `delListFromUniqSet` tcs
can_convert = isNullUFM (refs `minusUFM` cs) && all convertable tcs
must_convert = foldUFM (||) False (intersectUFM_C const cs refs)
convertable tc = isDataTyCon tc && all isVanillaDataCon (tyConDataCons tc)
tyConGroups :: [TyCon] -> [TyConGroup]
tyConGroups tcs = map mk_grp (stronglyConnCompFromEdgedVertices edges)
where
edges = [((tc, ds), tc, uniqSetToList ds) | tc <- tcs
, let ds = tyConsOfTyCon tc]
mk_grp (AcyclicSCC (tc, ds)) = ([tc], ds)
mk_grp (CyclicSCC els) = (tcs, unionManyUniqSets dss)
where
(tcs, dss) = unzip els
tyConsOfTyCon :: TyCon -> UniqSet TyCon
tyConsOfTyCon
= tyConsOfTypes . concatMap dataConRepArgTys . tyConDataCons
tyConsOfTypes :: [Type] -> UniqSet TyCon
tyConsOfTypes = unionManyUniqSets . map tyConsOfType
tyConsOfType :: Type -> UniqSet TyCon
tyConsOfType ty
| Just ty' <- coreView ty = tyConsOfType ty'
tyConsOfType (TyVarTy _) = emptyUniqSet
tyConsOfType (TyConApp tc tys) = extend (tyConsOfTypes tys)
where
extend | isUnLiftedTyCon tc
|| isTupleTyCon tc = id
| otherwise = (`addOneToUniqSet` tc)
tyConsOfType (AppTy a b) = tyConsOfType a `unionUniqSets` tyConsOfType b
tyConsOfType (FunTy a b) = (tyConsOfType a `unionUniqSets` tyConsOfType b)
`addOneToUniqSet` funTyCon
tyConsOfType (ForAllTy _ ty) = tyConsOfType ty
tyConsOfType other = pprPanic "ClosureConv.tyConsOfType" $ ppr other