\begin{code}
module TcTyDecls (
- tcTyDecl, kcTyDecl,
- tcConDecl,
- mkDataBinds
+ tcTyDecl1,
+ kcConDetails,
+ mkImplicitDataBinds, mkNewTyConRep
) where
#include "HsVersions.h"
import HsSyn ( MonoBinds(..),
TyClDecl(..), ConDecl(..), ConDetails(..), BangType(..),
- andMonoBindList
+ getBangType
)
-import RnHsSyn ( RenamedTyClDecl, RenamedConDecl )
-import TcHsSyn ( TcMonoBinds )
-import BasicTypes ( RecFlag(..), NewOrData(..), StrictnessMark(..) )
+import RnHsSyn ( RenamedTyClDecl, RenamedConDecl, RenamedContext )
+import TcHsSyn ( TcMonoBinds, idsToMonoBinds )
+import BasicTypes ( NewOrData(..) )
-import TcMonoType ( tcExtendTopTyVarScope, tcExtendTyVarScope,
- tcHsTypeKind, tcHsType, tcHsTopType, tcHsTopBoxedType,
- tcContext
+import TcMonoType ( tcHsType, tcHsSigType, tcHsBoxedSigType, tcHsTyVars, tcClassContext,
+ kcHsContext, kcHsSigType
+ )
+import TcEnv ( tcExtendTyVarEnv,
+ tcLookupTyCon, tcLookupClass, tcLookupGlobalId,
+ TyThingDetails(..)
)
-import TcEnv ( tcLookupTy, TcTyThing(..) )
import TcMonad
-import TcUnify ( unifyKind )
-import Class ( Class )
-import DataCon ( DataCon, dataConSig, mkDataCon, isNullaryDataCon,
- dataConFieldLabels, dataConId
+import Class ( ClassContext )
+import DataCon ( DataCon, mkDataCon,
+ dataConFieldLabels, dataConId, dataConWrapId,
+ markedStrict, notMarkedStrict, markedUnboxed, dataConRepType
)
-import MkId ( mkDataConId, mkRecordSelId )
-import Id ( getIdUnfolding )
-import CoreUnfold ( getUnfoldingTemplate )
+import MkId ( mkDataConId, mkDataConWrapId, mkRecordSelId )
import FieldLabel
import Var ( Id, TyVar )
-import Name ( isLocallyDefined, OccName, NamedThing(..) )
+import Name ( Name, isLocallyDefined, NamedThing(..) )
import Outputable
-import TyCon ( TyCon, mkSynTyCon, mkAlgTyCon, isAlgTyCon,
- isSynTyCon, tyConDataCons
+import TyCon ( TyCon, isSynTyCon, isNewTyCon,
+ tyConDataConsIfAvailable, tyConTyVars, tyConGenIds
)
-import Type ( getTyVar, tyVarsOfTypes,
- mkTyConApp, mkTyVarTys, mkForAllTys, mkFunTy,
- mkTyVarTy,
- mkArrowKind, mkArrowKinds, boxedTypeKind,
- isUnboxedType, Type, ThetaType
+import Type ( tyVarsOfTypes, splitFunTy, applyTys,
+ mkTyConApp, mkTyVarTys, mkForAllTys,
+ splitAlgTyConApp_maybe, Type
)
-import Var ( tyVarKind )
+import TysWiredIn ( unitTy )
import VarSet ( intersectVarSet, isEmptyVarSet )
-import Util ( equivClasses )
-\end{code}
-
-%************************************************************************
-%* *
-\subsection{Kind checking}
-%* *
-%************************************************************************
-
-\begin{code}
-kcTyDecl :: RenamedTyClDecl -> TcM s ()
-
-kcTyDecl (TySynonym name tyvar_names rhs src_loc)
- = tcLookupTy name `thenNF_Tc` \ (kind, _, _) ->
- tcExtendTopTyVarScope kind tyvar_names $ \ _ result_kind ->
- tcHsTypeKind rhs `thenTc` \ (rhs_kind, _) ->
- unifyKind result_kind rhs_kind
-
-kcTyDecl (TyData _ context tycon_name tyvar_names con_decls _ _ src_loc)
- = tcLookupTy tycon_name `thenNF_Tc` \ (kind, _, _) ->
- tcExtendTopTyVarScope kind tyvar_names $ \ result_kind _ ->
- tcContext context `thenTc_`
- mapTc kcConDecl con_decls `thenTc_`
- returnTc ()
-
-kcConDecl (ConDecl _ ex_tvs ex_ctxt details loc)
- = tcAddSrcLoc loc (
- tcExtendTyVarScope ex_tvs ( \ tyvars ->
- tcContext ex_ctxt `thenTc_`
- kc_con details `thenTc_`
- returnTc ()
- ))
- where
- kc_con (VanillaCon btys) = mapTc kc_bty btys `thenTc_` returnTc ()
- kc_con (InfixCon bty1 bty2) = mapTc kc_bty [bty1,bty2] `thenTc_` returnTc ()
- kc_con (NewCon ty) = tcHsType ty `thenTc_` returnTc ()
- kc_con (RecCon flds) = mapTc kc_field flds `thenTc_` returnTc ()
-
- kc_bty (Banged ty) = tcHsType ty
- kc_bty (Unbanged ty) = tcHsType ty
-
- kc_field (_, bty) = kc_bty bty
+import PrelNames ( unpackCStringName, unpackCStringUtf8Name )
+import ListSetOps ( equivClasses )
\end{code}
-
%************************************************************************
%* *
\subsection{Type checking}
%************************************************************************
\begin{code}
-tcTyDecl :: RecFlag -> RenamedTyClDecl -> TcM s TyCon
-
-tcTyDecl is_rec (TySynonym tycon_name tyvar_names rhs src_loc)
- = tcLookupTy tycon_name `thenNF_Tc` \ (tycon_kind, Just arity, _) ->
- tcExtendTopTyVarScope tycon_kind tyvar_names $ \ tyvars _ ->
- tcHsTopType rhs `thenTc` \ rhs_ty ->
+tcTyDecl1 :: RenamedTyClDecl -> TcM (Name, TyThingDetails)
+tcTyDecl1 (TySynonym tycon_name tyvar_names rhs src_loc)
+ = tcLookupTyCon tycon_name `thenNF_Tc` \ tycon ->
+ tcExtendTyVarEnv (tyConTyVars tycon) $
+ tcHsType rhs `thenTc` \ rhs_ty ->
+ -- Note tcHsType not tcHsSigType; we allow type synonyms
+ -- that aren't types; e.g. type List = []
+ --
+ -- If the RHS mentions tyvars that aren't in scope, we'll
+ -- quantify over them:
+ -- e.g. type T = a->a
+ -- will become type T = forall a. a->a
+ --
+ -- With gla-exts that's right, but for H98 we should complain.
+ -- We can now do that here without falling into
+ -- a black hole, we still do it in rnDecl (TySynonym case)
+
+ returnTc (tycon_name, SynTyDetails rhs_ty)
+
+tcTyDecl1 (TyData new_or_data context tycon_name _ con_decls _ derivings src_loc name1 name2)
+ = tcLookupTyCon tycon_name `thenNF_Tc` \ tycon ->
let
- -- Construct the tycon
- tycon = mkSynTyCon tycon_name tycon_kind arity tyvars rhs_ty
+ tyvars = tyConTyVars tycon
in
- returnTc tycon
-
-
-tcTyDecl is_rec (TyData data_or_new context tycon_name tyvar_names con_decls derivings pragmas src_loc)
- = -- Lookup the pieces
- tcLookupTy tycon_name `thenNF_Tc` \ (tycon_kind, _, ATyCon rec_tycon) ->
- tcExtendTopTyVarScope tycon_kind tyvar_names $ \ tyvars _ ->
+ tcExtendTyVarEnv tyvars $
-- Typecheck the pieces
- tcContext context `thenTc` \ ctxt ->
- mapTc (tcConDecl rec_tycon tyvars ctxt) con_decls `thenTc` \ data_cons ->
- tc_derivs derivings `thenTc` \ derived_classes ->
+ tcClassContext context `thenTc` \ ctxt ->
+ tc_derivs derivings `thenTc` \ derived_classes ->
+ mapTc (tcConDecl new_or_data tycon tyvars ctxt) con_decls `thenTc` \ data_cons ->
- let
- -- Construct the tycon
- real_data_or_new = case data_or_new of
- NewType -> NewType
- DataType | all isNullaryDataCon data_cons -> EnumType
- | otherwise -> DataType
-
- tycon = mkAlgTyCon tycon_name tycon_kind tyvars ctxt
- data_cons
- derived_classes
- Nothing -- Not a dictionary
- real_data_or_new is_rec
- in
- returnTc tycon
+ returnTc (tycon_name, DataTyDetails ctxt data_cons derived_classes)
where
- tc_derivs Nothing = returnTc []
- tc_derivs (Just ds) = mapTc tc_deriv ds
+ tc_derivs Nothing = returnTc []
+ tc_derivs (Just ds) = mapTc tcLookupClass ds
+\end{code}
+
+\begin{code}
+mkNewTyConRep :: TyCon -> Type
+-- Find the representation type for this newtype TyCon
+-- The trick is to to deal correctly with recursive newtypes
+-- such as newtype T = MkT T
- tc_deriv name = tcLookupTy name `thenTc` \ (_, _, AClass clas) ->
- returnTc clas
+mkNewTyConRep tc
+ = mkForAllTys tvs (loop [] (mkTyConApp tc (mkTyVarTys tvs)))
+ where
+ tvs = tyConTyVars tc
+ loop tcs ty = case splitAlgTyConApp_maybe ty of {
+ Nothing -> ty ;
+ Just (tc, tys, data_cons) | not (isNewTyCon tc) -> ty
+ | tc `elem` tcs -> unitTy
+ | otherwise ->
+
+ case splitFunTy (applyTys (dataConRepType (head data_cons)) tys) of
+ (rep_ty, _) -> loop (tc:tcs) rep_ty
+ }
\end{code}
%************************************************************************
%* *
-\subsection{Type check constructors}
+\subsection{Kind and type check constructors}
%* *
%************************************************************************
\begin{code}
-tcConDecl :: TyCon -> [TyVar] -> ThetaType -> RenamedConDecl -> TcM s DataCon
-
-tcConDecl tycon tyvars ctxt (ConDecl name ex_tvs ex_ctxt details src_loc)
- = tcAddSrcLoc src_loc $
- tcExtendTyVarScope ex_tvs $ \ ex_tyvars ->
- tcContext ex_ctxt `thenTc` \ ex_theta ->
- tc_con_decl_help tycon tyvars ctxt name ex_tyvars ex_theta details
-
-tc_con_decl_help tycon tyvars ctxt name ex_tyvars ex_theta details
- = case details of
- VanillaCon btys -> tc_datacon btys
- InfixCon bty1 bty2 -> tc_datacon [bty1,bty2]
- NewCon ty -> tc_newcon ty
- RecCon fields -> tc_rec_con fields
+kcConDetails :: RenamedContext -> ConDetails Name -> TcM ()
+kcConDetails ex_ctxt details
+ = kcHsContext ex_ctxt `thenTc_`
+ kc_con_details details
where
- tc_datacon btys
- = let
- arg_stricts = map get_strictness btys
- tys = map get_pty btys
- in
- mapTc tcHsTopType tys `thenTc` \ arg_tys ->
- returnTc (mk_data_con arg_stricts arg_tys [])
+ kc_con_details (VanillaCon btys) = mapTc_ kc_bty btys
+ kc_con_details (InfixCon bty1 bty2) = mapTc_ kc_bty [bty1,bty2]
+ kc_con_details (RecCon flds) = mapTc_ kc_field flds
+
+ kc_field (_, bty) = kc_bty bty
+
+ kc_bty bty = kcHsSigType (getBangType bty)
+
+tcConDecl :: NewOrData -> TyCon -> [TyVar] -> ClassContext -> RenamedConDecl -> TcM DataCon
- tc_newcon ty
- = tcHsTopBoxedType ty `thenTc` \ arg_ty ->
- -- can't allow an unboxed type here, because we're effectively
+tcConDecl new_or_data tycon tyvars ctxt (ConDecl name wkr_name ex_tvs ex_ctxt details src_loc)
+ = tcAddSrcLoc src_loc $
+ tcHsTyVars ex_tvs (kcConDetails ex_ctxt details) $ \ ex_tyvars ->
+ tcClassContext ex_ctxt `thenTc` \ ex_theta ->
+ case details of
+ VanillaCon btys -> tc_datacon ex_tyvars ex_theta btys
+ InfixCon bty1 bty2 -> tc_datacon ex_tyvars ex_theta [bty1,bty2]
+ RecCon fields -> tc_rec_con ex_tyvars ex_theta fields
+ where
+ tc_sig_type = case new_or_data of
+ DataType -> tcHsSigType
+ NewType -> tcHsBoxedSigType
+ -- Can't allow an unboxed type here, because we're effectively
-- going to remove the constructor while coercing it to a boxed type.
- returnTc (mk_data_con [NotMarkedStrict] [arg_ty] [])
- tc_rec_con fields
- = checkTc (null ex_tyvars) (exRecConErr name) `thenTc_`
- mapTc tc_field fields `thenTc` \ field_label_infos_s ->
- let
- field_label_infos = concat field_label_infos_s
- arg_stricts = [strict | (_, _, strict) <- field_label_infos]
- arg_tys = [ty | (_, ty, _) <- field_label_infos]
+ tc_datacon ex_tyvars ex_theta btys
+ = let
+ arg_stricts = map getBangStrictness btys
+ tys = map getBangType btys
+ in
+ mapTc tc_sig_type tys `thenTc` \ arg_tys ->
+ mk_data_con ex_tyvars ex_theta arg_stricts arg_tys []
- field_labels = [ mkFieldLabel (getName name) ty tag
- | ((name, ty, _), tag) <- field_label_infos `zip` allFieldLabelTags ]
+ tc_rec_con ex_tyvars ex_theta fields
+ = checkTc (null ex_tyvars) (exRecConErr name) `thenTc_`
+ mapTc tc_field (fields `zip` allFieldLabelTags) `thenTc` \ field_labels_s ->
+ let
+ field_labels = concat field_labels_s
+ arg_stricts = [str | (ns, bty) <- fields,
+ let str = getBangStrictness bty,
+ n <- ns -- One for each. E.g x,y,z :: !Int
+ ]
in
- returnTc (mk_data_con arg_stricts arg_tys field_labels)
+ mk_data_con ex_tyvars ex_theta arg_stricts
+ (map fieldLabelType field_labels) field_labels
- tc_field (field_label_names, bty)
- = tcHsTopType (get_pty bty) `thenTc` \ field_ty ->
- returnTc [(name, field_ty, get_strictness bty) | name <- field_label_names]
+ tc_field ((field_label_names, bty), tag)
+ = tc_sig_type (getBangType bty) `thenTc` \ field_ty ->
+ returnTc [mkFieldLabel (getName name) tycon field_ty tag | name <- field_label_names]
- mk_data_con arg_stricts arg_tys fields = data_con
- where
+ mk_data_con ex_tyvars ex_theta arg_stricts arg_tys fields
+ = let
data_con = mkDataCon name arg_stricts fields
tyvars (thinContext arg_tys ctxt)
ex_tyvars ex_theta
arg_tys
- tycon data_con_id
- data_con_id = mkDataConId data_con
+ tycon data_con_id data_con_wrap_id
+ data_con_id = mkDataConId wkr_name data_con
+ data_con_wrap_id = mkDataConWrapId data_con
+ in
+ returnNF_Tc data_con
-- The context for a data constructor should be limited to
-- the type variables mentioned in the arg_tys
arg_tyvars = tyVarsOfTypes arg_tys
in_arg_tys (clas,tys) = not $ isEmptyVarSet $
tyVarsOfTypes tys `intersectVarSet` arg_tyvars
-
-get_strictness (Banged _) = MarkedStrict
-get_strictness (Unbanged _) = NotMarkedStrict
-get_pty (Banged ty) = ty
-get_pty (Unbanged ty) = ty
+getBangStrictness (Banged _) = markedStrict
+getBangStrictness (Unbanged _) = notMarkedStrict
+getBangStrictness (Unpacked _) = markedUnboxed
\end{code}
%************************************************************************
\begin{code}
-mkDataBinds :: [TyCon] -> TcM s ([Id], TcMonoBinds)
-mkDataBinds [] = returnTc ([], EmptyMonoBinds)
-mkDataBinds (tycon : tycons)
- | isSynTyCon tycon = mkDataBinds tycons
- | otherwise = mkDataBinds_one tycon `thenTc` \ (ids1, b1) ->
- mkDataBinds tycons `thenTc` \ (ids2, b2) ->
+mkImplicitDataBinds :: [TyCon] -> TcM ([Id], TcMonoBinds)
+mkImplicitDataBinds [] = returnTc ([], EmptyMonoBinds)
+mkImplicitDataBinds (tycon : tycons)
+ | isSynTyCon tycon = mkImplicitDataBinds tycons
+ | otherwise = mkImplicitDataBinds_one tycon `thenTc` \ (ids1, b1) ->
+ mkImplicitDataBinds tycons `thenTc` \ (ids2, b2) ->
returnTc (ids1++ids2, b1 `AndMonoBinds` b2)
-mkDataBinds_one tycon
- = ASSERT( isAlgTyCon tycon )
- mapTc (mkRecordSelector tycon) groups `thenTc` \ sel_ids ->
+mkImplicitDataBinds_one tycon
+ = mapTc (mkRecordSelector tycon) groups `thenTc` \ sel_ids ->
let
- data_ids = map dataConId data_cons ++ sel_ids
+ unf_ids = sel_ids ++ data_con_wrapper_ids ++ gen_ids
+ all_ids = map dataConId data_cons ++ unf_ids
-- For the locally-defined things
- -- we need to turn the unfoldings inside the Ids into bindings,
- binds = [ CoreMonoBind data_id (getUnfoldingTemplate (getIdUnfolding data_id))
- | data_id <- data_ids, isLocallyDefined data_id
- ]
+ -- we need to turn the unfoldings inside the selector Ids into bindings,
+ -- and build bindigns for the constructor wrappers
+ binds | isLocallyDefined tycon = idsToMonoBinds unf_ids
+ | otherwise = EmptyMonoBinds
in
- returnTc (data_ids, andMonoBindList binds)
+ returnTc (all_ids, binds)
where
- data_cons = tyConDataCons tycon
+ data_cons = tyConDataConsIfAvailable tycon
+ -- Abstract types mean we don't bring the
+ -- data cons into scope, which should be fine
+ gen_ids = tyConGenIds tycon
+ data_con_wrapper_ids = map dataConWrapId data_cons
+
fields = [ (con, field) | con <- data_cons,
field <- dataConFieldLabels con
]
-- data type use the same type variables
= checkTc (all (== field_ty) other_tys)
(fieldTypeMisMatch field_name) `thenTc_`
- returnTc selector_id
+ tcLookupGlobalId unpackCStringName `thenTc` \ unpack_id ->
+ tcLookupGlobalId unpackCStringUtf8Name `thenTc` \ unpackUtf8_id ->
+ returnTc (mkRecordSelId tycon first_field_label unpack_id unpackUtf8_id)
where
field_ty = fieldLabelType first_field_label
field_name = fieldLabelName first_field_label
other_tys = [fieldLabelType fl | (_, fl) <- other_fields]
- (tyvars, _, _, _, _, _) = dataConSig first_con
- data_ty = mkTyConApp tycon (mkTyVarTys tyvars)
- -- tyvars of first_con may be free in field_ty
- -- Now build the selector
-
- selector_ty :: Type
- selector_ty = mkForAllTys tyvars $
- mkFunTy data_ty $
- field_ty
-
- selector_id :: Id
- selector_id = mkRecordSelId first_field_label selector_ty
\end{code}
projects / ghc-hetmet.git / blobdiff