module BuildTyCl (
buildSynTyCon, buildAlgTyCon, buildDataCon,
buildClass,
- mkAbstractTyConRhs, mkNewTyConRhs, mkDataTyConRhs
+ mkAbstractTyConRhs, mkOpenDataTyConRhs, mkOpenNewTyConRhs,
+ mkNewTyConRhs, mkDataTyConRhs
) where
#include "HsVersions.h"
import TysWiredIn ( unitTy )
import BasicTypes ( RecFlag, StrictnessMark(..) )
import Name ( Name )
-import OccName ( mkDataConWrapperOcc, mkDataConWorkerOcc, mkClassTyConOcc,
- mkClassDataConOcc, mkSuperDictSelOcc, mkNewTyCoOcc )
+import OccName ( mkDataConWrapperOcc, mkDataConWorkerOcc,
+ mkClassTyConOcc, mkClassDataConOcc,
+ mkSuperDictSelOcc, mkNewTyCoOcc, mkLocalOcc )
import MkId ( mkDataConIds, mkRecordSelId, mkDictSelId )
import Class ( mkClass, Class( classTyCon), FunDep, DefMeth(..) )
-import TyCon ( mkSynTyCon, mkAlgTyCon, visibleDataCons, tyConStupidTheta,
- tyConDataCons, isNewTyCon, mkClassTyCon, TyCon( tyConTyVars ),
- isRecursiveTyCon, tyConArity,
- AlgTyConRhs(..), newTyConRhs )
+import TyCon ( mkSynTyCon, mkAlgTyCon, visibleDataCons,
+ tyConStupidTheta, tyConDataCons, isNewTyCon,
+ mkClassTyCon, TyCon( tyConTyVars ),
+ isRecursiveTyCon, tyConArity, AlgTyConRhs(..),
+ SynTyConRhs(..), newTyConRhs, AlgTyConParent(..) )
import Type ( mkArrowKinds, liftedTypeKind, typeKind,
tyVarsOfType, tyVarsOfTypes, tyVarsOfPred,
- splitTyConApp_maybe, splitAppTy_maybe, getTyVar_maybe,
- mkPredTys, mkTyVarTys, ThetaType, Type,
+ splitTyConApp_maybe, splitAppTy_maybe,
+ getTyVar_maybe,
+ mkPredTys, mkTyVarTys, ThetaType, Type, Kind,
+ TyThing(..),
substTyWith, zipTopTvSubst, substTheta, mkForAllTys,
mkTyConApp, mkTyVarTy )
import Coercion ( mkNewTypeCoercion )
\begin{code}
------------------------------------------------------
-buildSynTyCon name tvs rhs_ty
- = mkSynTyCon name kind tvs rhs_ty
+buildSynTyCon :: Name -> [TyVar] -> SynTyConRhs -> TyCon
+buildSynTyCon name tvs rhs@(OpenSynTyCon rhs_ki)
+ = mkSynTyCon name kind tvs rhs
+ where
+ kind = mkArrowKinds (map tyVarKind tvs) rhs_ki
+buildSynTyCon name tvs rhs@(SynonymTyCon rhs_ty)
+ = mkSynTyCon name kind tvs rhs
where
kind = mkArrowKinds (map tyVarKind tvs) (typeKind rhs_ty)
-> RecFlag
-> Bool -- True <=> want generics functions
-> Bool -- True <=> was declared in GADT syntax
+ -> Maybe TyCon -- Just family <=> instance of `family'
-> TcRnIf m n TyCon
buildAlgTyCon tc_name tvs stupid_theta rhs is_rec want_generics gadt_syn
- = do { let { tycon = mkAlgTyCon tc_name kind tvs stupid_theta
- rhs fields is_rec want_generics gadt_syn
+ mb_family
+ = do { -- In case of a type instance, we need to invent a new name for the
+ -- instance type, as `tc_name' is the family name.
+ ; uniq <- newUnique
+ ; (final_name, parent) <-
+ case mb_family of
+ Nothing -> return (tc_name, NoParentTyCon)
+ Just family ->
+ do { final_name <- newImplicitBinder tc_name (mkLocalOcc uniq)
+ ; return (final_name, FamilyTyCon family)
+ }
+ ; let { tycon = mkAlgTyCon final_name kind tvs stupid_theta rhs
+ fields parent is_rec want_generics gadt_syn
; kind = mkArrowKinds (map tyVarKind tvs) liftedTypeKind
; fields = mkTyConSelIds tycon rhs
}
mkAbstractTyConRhs :: AlgTyConRhs
mkAbstractTyConRhs = AbstractTyCon
+mkOpenDataTyConRhs :: AlgTyConRhs
+mkOpenDataTyConRhs = OpenDataTyCon
+
+mkOpenNewTyConRhs :: AlgTyConRhs
+mkOpenNewTyConRhs = OpenNewTyCon
+
mkDataTyConRhs :: [DataCon] -> AlgTyConRhs
mkDataTyConRhs cons
= DataTyCon { data_cons = cons, is_enum = all isNullarySrcDataCon cons }
-- because the latter is part of a knot, whereas the former is not.
mkNewTyConRhs tycon_name tycon con
= do { co_tycon_name <- newImplicitBinder tycon_name mkNewTyCoOcc
- ; let co_tycon = mkNewTypeCoercion co_tycon_name tycon tvs rhs_ty
+ ; let co_tycon = mkNewTypeCoercion co_tycon_name tycon tvs rhs_ty
+ cocon_maybe
+ | all_coercions || isRecursiveTyCon tycon
+ = Just co_tycon
+ | otherwise
+ = Nothing
; return (NewTyCon { data_con = con,
- nt_co = Just co_tycon,
+ nt_co = cocon_maybe,
-- Coreview looks through newtypes with a Nothing
-- for nt_co, or uses explicit coercions otherwise
nt_rhs = rhs_ty,
nt_etad_rhs = eta_reduce tvs rhs_ty,
nt_rep = mkNewTyConRep tycon rhs_ty }) }
where
+ -- if all_coercions is True then we use coercions for all newtypes
+ -- otherwise we use coercions for recursive newtypes and look through
+ -- non-recursive newtypes
+ all_coercions = True
tvs = tyConTyVars tycon
rhs_ty = head (dataConInstOrigArgTys con (mkTyVarTys tvs))
-- Instantiate the data con with the
if isRecursiveTyCon tc then
go (tc:tcs) (substTyWith tvs tys rhs_ty)
else
- go tcs (head tys)
+ substTyWith tvs tys rhs_ty
where
(tvs, rhs_ty) = newTyConRhs tc
-> ThetaType -- Does not include the "stupid theta"
-- or the GADT equalities
-> [Type] -> TyCon
+ -> Maybe [Type] -- Just ts <=> type pats of inst type
-> TcRnIf m n DataCon
-- A wrapper for DataCon.mkDataCon that
-- a) makes the worker Id
-- b) makes the wrapper Id if necessary, including
-- allocating its unique (hence monadic)
buildDataCon src_name declared_infix arg_stricts field_lbls
- univ_tvs ex_tvs eq_spec ctxt arg_tys tycon
+ univ_tvs ex_tvs eq_spec ctxt arg_tys tycon mb_typats
= do { wrap_name <- newImplicitBinder src_name mkDataConWrapperOcc
; work_name <- newImplicitBinder src_name mkDataConWorkerOcc
-- This last one takes the name of the data constructor in the source
data_con = mkDataCon src_name declared_infix
arg_stricts field_lbls
univ_tvs ex_tvs eq_spec ctxt
- arg_tys tycon stupid_ctxt dc_ids
+ arg_tys tycon mb_typats
+ stupid_ctxt dc_ids
dc_ids = mkDataConIds wrap_name work_name data_con
; returnM data_con }
\begin{code}
buildClass :: Name -> [TyVar] -> ThetaType
-> [FunDep TyVar] -- Functional dependencies
+ -> [TyThing] -- Associated types
-> [(Name, DefMeth, Type)] -- Method info
-> RecFlag -- Info for type constructor
-> TcRnIf m n Class
-buildClass class_name tvs sc_theta fds sig_stuff tc_isrec
+buildClass class_name tvs sc_theta fds ats sig_stuff tc_isrec
= do { tycon_name <- newImplicitBinder class_name mkClassTyConOcc
; datacon_name <- newImplicitBinder class_name mkClassDataConOcc
-- The class name is the 'parent' for this datacon, not its tycon,
tvs [{- no existentials -}]
[{- No equalities -}] [{-No context-}]
dict_component_tys
- rec_tycon
+ rec_tycon Nothing
; rhs <- case dict_component_tys of
[rep_ty] -> mkNewTyConRhs tycon_name rec_tycon dict_con
-- Because C has only one operation, it is represented by
-- a newtype, and it should be a *recursive* newtype.
-- [If we don't make it a recursive newtype, we'll expand the
- -- newtype like a synonym, but that will lead to an infinite type]
+ -- newtype like a synonym, but that will lead to an infinite
+ -- type]
+ ; atTyCons = [tycon | ATyCon tycon <- ats]
}
- ; return (mkClass class_name tvs fds
- sc_theta sc_sel_ids op_items
+ ; return (mkClass class_name tvs fds
+ sc_theta sc_sel_ids atTyCons op_items
tycon)
})}
\end{code}
projects / ghc-hetmet.git / blobdiff