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|
module GHC.Types.TypeEnv
( TypeEnv(..)
, emptyTypeEnv
, lookupTypeEnv
, mkTypeEnv
, typeEnvFromEntities
, mkTypeEnvWithImplicits
, extendTypeEnv
, extendTypeEnvList
, extendTypeEnvWithIds
, plusTypeEnv
, typeEnvElts
, typeEnvTyCons
, typeEnvIds
, typeEnvPatSyns
, typeEnvDataCons
, typeEnvCoAxioms
, typeEnvClasses
, elemTypeEnv
, mapTypeEnv
)
where
import GHC.Prelude
import GHC.Core.Class
import GHC.Core.Coercion.Axiom
import GHC.Core.ConLike
import GHC.Core.DataCon
import GHC.Core.FamInstEnv
import GHC.Core.PatSyn
import GHC.Core.TyCon
import GHC.Types.Name
import GHC.Types.Name.Env
import GHC.Types.Var
import GHC.Types.TyThing
import GHC.Utils.Outputable
-- | A map from 'Name's to 'TyThing's, constructed by typechecking
-- local declarations or interface files
data TypeEnv = TypeEnv !(NameEnv TyThing)
emptyTypeEnv :: TypeEnv
typeEnvElts :: TypeEnv -> [TyThing]
typeEnvTyCons :: TypeEnv -> [TyCon]
typeEnvCoAxioms :: TypeEnv -> [CoAxiom Branched]
typeEnvIds :: TypeEnv -> [Id]
typeEnvPatSyns :: TypeEnv -> [PatSyn]
typeEnvDataCons :: TypeEnv -> [DataCon]
typeEnvClasses :: TypeEnv -> [Class]
lookupTypeEnv :: TypeEnv -> Name -> Maybe TyThing
emptyTypeEnv = TypeEnv emptyNameEnv
typeEnvElts (TypeEnv env) = nameEnvElts env
typeEnvTyCons env = [tc | ATyCon tc <- typeEnvElts env]
typeEnvCoAxioms env = [ax | ACoAxiom ax <- typeEnvElts env]
typeEnvIds env = [id | AnId id <- typeEnvElts env]
typeEnvPatSyns env = [ps | AConLike (PatSynCon ps) <- typeEnvElts env]
typeEnvDataCons env = [dc | AConLike (RealDataCon dc) <- typeEnvElts env]
typeEnvClasses env = [cl | tc <- typeEnvTyCons env,
Just cl <- [tyConClass_maybe tc]]
mkTypeEnv :: [TyThing] -> TypeEnv
mkTypeEnv things = extendTypeEnvList emptyTypeEnv things
elemTypeEnv :: Name -> TypeEnv -> Bool
elemTypeEnv n (TypeEnv env) = elemNameEnv n env
mapTypeEnv :: (TyThing -> TyThing) -> TypeEnv -> TypeEnv
mapTypeEnv f (TypeEnv env) = TypeEnv (mapNameEnv f env)
mkTypeEnvWithImplicits :: [TyThing] -> TypeEnv
mkTypeEnvWithImplicits things =
mkTypeEnv things
`plusTypeEnv`
mkTypeEnv (concatMap implicitTyThings things)
plusTypeEnv :: TypeEnv -> TypeEnv -> TypeEnv
plusTypeEnv (TypeEnv t1) (TypeEnv t2) = TypeEnv (t1 `plusNameEnv` t2)
typeEnvFromEntities :: [Id] -> [TyCon] -> [PatSyn] -> [FamInst] -> TypeEnv
typeEnvFromEntities ids tcs patsyns famInsts =
mkTypeEnv ( map AnId ids
++ map ATyCon all_tcs
++ concatMap implicitTyConThings all_tcs
++ map (ACoAxiom . toBranchedAxiom . famInstAxiom) famInsts
++ map (AConLike . PatSynCon) patsyns
)
where
all_tcs = tcs ++ famInstsRepTyCons famInsts
lookupTypeEnv (TypeEnv t) = lookupNameEnv t
-- Extend the type environment
extendTypeEnv :: TypeEnv -> TyThing -> TypeEnv
extendTypeEnv (TypeEnv env) thing = TypeEnv (extendNameEnv env (getName thing) thing)
extendTypeEnvList :: TypeEnv -> [TyThing] -> TypeEnv
extendTypeEnvList env things = (foldl' extendTypeEnv env things)
extendTypeEnvWithIds :: TypeEnv -> [Id] -> TypeEnv
extendTypeEnvWithIds (TypeEnv env) ids
= TypeEnv (extendNameEnvList env [(getName id, AnId id) | id <- ids])
instance Outputable TypeEnv where
ppr (TypeEnv t) = ppr t
|
