\begin{code}
module TcTyDecls (
- tcTyDecl,
+ tcTyDecl, kcTyDecl,
tcConDecl,
mkDataBinds
) where
#include "HsVersions.h"
import HsSyn ( MonoBinds(..),
- TyDecl(..), ConDecl(..), ConDetails(..), BangType(..),
+ TyClDecl(..), ConDecl(..), ConDetails(..), BangType(..),
andMonoBindList
)
-import RnHsSyn ( RenamedTyDecl, RenamedConDecl )
+import RnHsSyn ( RenamedTyClDecl, RenamedConDecl )
import TcHsSyn ( TcMonoBinds )
import BasicTypes ( RecFlag(..), NewOrData(..), StrictnessMark(..) )
-import Inst ( InstOrigin(..) )
-import TcMonoType ( tcHsTypeKind, tcHsType, tcContext )
-import TcEnv ( TcIdOcc(..),
- tcLookupTyCon, tcLookupClass,
- tcLookupTyVarBndrs
+import TcMonoType ( tcExtendTopTyVarScope, tcExtendTyVarScope,
+ tcHsTypeKind, tcHsType, tcHsTopType, tcHsTopBoxedType,
+ tcContext
)
+import TcEnv ( tcLookupTy, TcTyThing(..) )
import TcMonad
import TcUnify ( unifyKind )
import CoreUnfold ( getUnfoldingTemplate )
import FieldLabel
import Var ( Id, TyVar )
-import Name ( isLocallyDefined, OccName(..), NamedThing(..) )
+import Name ( isLocallyDefined, OccName, NamedThing(..) )
import Outputable
import TyCon ( TyCon, mkSynTyCon, mkAlgTyCon, isAlgTyCon,
isSynTyCon, tyConDataCons
)
-import Type ( typeKind, getTyVar, tyVarsOfTypes,
+import Type ( getTyVar, tyVarsOfTypes,
mkTyConApp, mkTyVarTys, mkForAllTys, mkFunTy,
mkTyVarTy,
mkArrowKind, mkArrowKinds, boxedTypeKind,
)
import Var ( tyVarKind )
import VarSet ( intersectVarSet, isEmptyVarSet )
-import Util ( equivClasses, panic, assertPanic )
+import Util ( equivClasses )
\end{code}
+%************************************************************************
+%* *
+\subsection{Kind checking}
+%* *
+%************************************************************************
+
\begin{code}
-tcTyDecl :: RecFlag -> RenamedTyDecl -> TcM s TyCon
-\end{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 ()
-Type synonym decls
-~~~~~~~~~~~~~~~~~~
+ kc_bty (Banged ty) = tcHsType ty
+ kc_bty (Unbanged ty) = tcHsType ty
-\begin{code}
-tcTyDecl is_rec (TySynonym tycon_name tyvar_names rhs src_loc)
- = tcAddSrcLoc src_loc $
- tcAddErrCtxt (tySynCtxt tycon_name) $
+ kc_field (_, bty) = kc_bty bty
+\end{code}
- -- Look up the pieces
- tcLookupTyCon tycon_name `thenTc` \ (tycon_kind, _, rec_tycon) ->
- tcLookupTyVarBndrs tyvar_names `thenNF_Tc` \ (tyvar_kinds, rec_tyvars) ->
- -- Look at the rhs
- tcHsTypeKind rhs `thenTc` \ (rhs_kind, rhs_ty) ->
+%************************************************************************
+%* *
+\subsection{Type checking}
+%* *
+%************************************************************************
- -- Unify tycon kind with (k1->...->kn->rhs)
- unifyKind tycon_kind (mkArrowKinds tyvar_kinds rhs_kind) `thenTc_`
+\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 ->
let
-- Construct the tycon
- kind = mkArrowKinds (map tyVarKind rec_tyvars) (typeKind rhs_ty)
- tycon = mkSynTyCon (getName tycon_name)
- kind
- (length tyvar_names)
- rec_tyvars
- rhs_ty
+ tycon = mkSynTyCon tycon_name tycon_kind arity tyvars rhs_ty
in
returnTc tycon
-\end{code}
-Algebraic data and newtype decls
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-\begin{code}
tcTyDecl is_rec (TyData data_or_new context tycon_name tyvar_names con_decls derivings pragmas src_loc)
- = tcAddSrcLoc src_loc $
- let ctxt = case data_or_new of
- NewType -> tyNewCtxt tycon_name
- DataType -> tyDataCtxt tycon_name
- in
- tcAddErrCtxt ctxt $
+ = -- Lookup the pieces
+ tcLookupTy tycon_name `thenNF_Tc` \ (tycon_kind, _, ATyCon rec_tycon) ->
+ tcExtendTopTyVarScope tycon_kind tyvar_names $ \ tyvars _ ->
- -- Lookup the pieces
- tcLookupTyCon tycon_name `thenTc` \ (tycon_kind, _, rec_tycon) ->
- tcLookupTyVarBndrs tyvar_names `thenNF_Tc` \ (tyvar_kinds, rec_tyvars) ->
- tc_derivs derivings `thenTc` \ derived_classes ->
+ -- Typecheck the pieces
+ tcContext context `thenTc` \ ctxt ->
+ mapTc (tcConDecl rec_tycon tyvars ctxt) con_decls `thenTc` \ data_cons ->
+ tc_derivs derivings `thenTc` \ derived_classes ->
- -- Typecheck the context
- tcContext context `thenTc` \ ctxt ->
-
- -- Unify tycon kind with (k1->...->kn->Type)
- unifyKind tycon_kind (mkArrowKinds tyvar_kinds boxedTypeKind) `thenTc_`
-
- -- Walk the condecls
- mapTc (tcConDecl rec_tycon rec_tyvars ctxt) con_decls
- `thenTc` \ data_cons ->
let
-- Construct the tycon
real_data_or_new = case data_or_new of
NewType -> NewType
- DataType -> if all isNullaryDataCon data_cons then
- EnumType
- else
- DataType
-
- kind = foldr (mkArrowKind . tyVarKind) boxedTypeKind rec_tyvars
- tycon = mkAlgTyCon (getName tycon_name)
- kind
- rec_tyvars
- ctxt
+ 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
+ real_data_or_new is_rec
in
returnTc tycon
+ where
+ tc_derivs Nothing = returnTc []
+ tc_derivs (Just ds) = mapTc tc_deriv ds
+
+ tc_deriv name = tcLookupTy name `thenTc` \ (_, _, AClass clas) ->
+ returnTc clas
+\end{code}
-tc_derivs Nothing = returnTc []
-tc_derivs (Just ds) = mapTc tc_deriv ds
-tc_deriv name
- = tcLookupClass name `thenTc` \ (_, clas) ->
- returnTc clas
+%************************************************************************
+%* *
+\subsection{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
+ 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 [])
+
+ tc_newcon ty
+ = tcHsTopBoxedType ty `thenTc` \ arg_ty ->
+ -- 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]
+
+ field_labels = [ mkFieldLabel (getName name) ty tag
+ | ((name, ty, _), tag) <- field_label_infos `zip` allFieldLabelTags ]
+ in
+ returnTc (mk_data_con arg_stricts arg_tys 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]
+
+ mk_data_con arg_stricts arg_tys fields = data_con
+ where
+ 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
+
+
+-- The context for a data constructor should be limited to
+-- the type variables mentioned in the arg_tys
+thinContext arg_tys ctxt
+ = filter in_arg_tys ctxt
+ where
+ 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
\end{code}
-Generating constructor/selector bindings for data declarations
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+
+%************************************************************************
+%* *
+\subsection{Generating constructor/selector bindings for data declarations}
+%* *
+%************************************************************************
\begin{code}
-mkDataBinds :: [TyCon] -> TcM s ([Id], TcMonoBinds s)
+mkDataBinds :: [TyCon] -> TcM s ([Id], TcMonoBinds)
mkDataBinds [] = returnTc ([], EmptyMonoBinds)
mkDataBinds (tycon : tycons)
| isSynTyCon tycon = mkDataBinds tycons
-- For the locally-defined things
-- we need to turn the unfoldings inside the Ids into bindings,
- binds = [ CoreMonoBind (RealId data_id) (getUnfoldingTemplate (getIdUnfolding data_id))
+ binds = [ CoreMonoBind data_id (getUnfoldingTemplate (getIdUnfolding data_id))
| data_id <- data_ids, isLocallyDefined data_id
]
in
selector_id = mkRecordSelId first_field_label selector_ty
\end{code}
-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 $
- tcLookupTyVarBndrs ex_tvs `thenNF_Tc` \ (kinds, ex_tyvars) ->
- tcContext ex_ctxt `thenTc` \ ex_theta ->
- tc_con_help tycon tyvars ctxt name ex_tyvars ex_theta details
-
-tc_con_help tycon tyvars ctxt name ex_tyvars ex_theta (VanillaCon btys)
- = tc_datacon_help tycon tyvars ctxt name ex_tyvars ex_theta btys
-
-tc_con_help tycon tyvars ctxt name ex_tyvars ex_theta (InfixCon bty1 bty2)
- = tc_datacon_help tycon tyvars ctxt name ex_tyvars ex_theta [bty1,bty2]
-
-tc_con_help tycon tyvars ctxt name ex_tyvars ex_theta (NewCon ty)
- = tcHsType ty `thenTc` \ arg_ty ->
- -- can't allow an unboxed type here, because we're effectively
- -- going to remove the constructor while coercing it to a boxed type.
- checkTc (not (isUnboxedType arg_ty)) (newTypeUnboxedField ty) `thenTc_`
- let
- data_con = mkDataCon (getName name)
- [NotMarkedStrict]
- [{- No labelled fields -}]
- tyvars
- ctxt
- ex_tyvars ex_theta
- [arg_ty]
- tycon data_con_id
- data_con_id = mkDataConId data_con
- in
- returnTc data_con
-
-tc_con_help tycon tyvars ctxt name ex_tyvars ex_theta (RecCon fields)
- = checkTc (null ex_tyvars) (exRecConErr name) `thenTc_`
- mapTc tcField 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]
-
- field_labels = [ mkFieldLabel (getName name) ty tag
- | ((name, ty, _), tag) <- field_label_infos `zip` allFieldLabelTags ]
-
- data_con = mkDataCon (getName name)
- arg_stricts
- field_labels
- tyvars
- (thinContext arg_tys ctxt)
- ex_tyvars ex_theta
- arg_tys
- tycon data_con_id
- data_con_id = mkDataConId data_con
- in
- returnTc data_con
-
-tcField (field_label_names, bty)
- = tcHsType (get_pty bty) `thenTc` \ field_ty ->
- returnTc [(name, field_ty, get_strictness bty) | name <- field_label_names]
-
-tc_datacon_help tycon tyvars ctxt name ex_tyvars ex_theta btys
- = let
- arg_stricts = map get_strictness btys
- tys = map get_pty btys
- in
- mapTc tcHsType tys `thenTc` \ arg_tys ->
- let
- data_con = mkDataCon (getName name)
- arg_stricts
- [{- No field labels -}]
- tyvars
- (thinContext arg_tys ctxt)
- ex_tyvars ex_theta
- arg_tys
- tycon data_con_id
- data_con_id = mkDataConId data_con
- in
- returnTc data_con
-
--- The context for a data constructor should be limited to
--- the type variables mentioned in the arg_tys
-thinContext arg_tys ctxt
- = filter in_arg_tys ctxt
- where
- 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
-\end{code}
-
-
Errors and contexts
~~~~~~~~~~~~~~~~~~~
\begin{code}
-tySynCtxt tycon_name
- = hsep [ptext SLIT("In the type declaration for"), quotes (ppr tycon_name)]
-
-tyDataCtxt tycon_name
- = hsep [ptext SLIT("In the data declaration for"), quotes (ppr tycon_name)]
-
-tyNewCtxt tycon_name
- = hsep [ptext SLIT("In the newtype declaration for"), quotes (ppr tycon_name)]
-
fieldTypeMisMatch field_name
= sep [ptext SLIT("Declared types differ for field"), quotes (ppr field_name)]
-newTypeUnboxedField ty
- = sep [ptext SLIT("Newtype constructor field has an unboxed type:"),
- quotes (ppr ty)]
-
exRecConErr name
= ptext SLIT("Can't combine named fields with locally-quantified type variables")
$$
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