X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Ftypecheck%2FTcTyDecls.lhs;h=9478ed49a75e54249a47e2a3d039b2100c56d5f7;hb=c92ddc55847b34d45f188f7c62092d69915a7a7d;hp=e95a944968a2d6b3b708d2d6671ca3f56d7f47ef;hpb=cae34044d89a87bd3da83b0e867b4a5d6994079a;p=ghc-hetmet.git diff --git a/ghc/compiler/typecheck/TcTyDecls.lhs b/ghc/compiler/typecheck/TcTyDecls.lhs index e95a944..9478ed4 100644 --- a/ghc/compiler/typecheck/TcTyDecls.lhs +++ b/ghc/compiler/typecheck/TcTyDecls.lhs @@ -4,55 +4,37 @@ \section[TcTyDecls]{Typecheck type declarations} \begin{code} -module TcTyDecls ( - tcTyDecl1, - kcConDetails, - mkImplicitDataBinds, mkNewTyConRep - ) where +module TcTyDecls ( tcTyDecl, kcConDetails ) where #include "HsVersions.h" -import HsSyn ( MonoBinds(..), - TyClDecl(..), ConDecl(..), ConDetails(..), BangType(..), - andMonoBindList, getBangType +import HsSyn ( TyClDecl(..), ConDecl(..), ConDetails(..), + getBangType, getBangStrictness, conDetailsTys ) import RnHsSyn ( RenamedTyClDecl, RenamedConDecl, RenamedContext ) -import TcHsSyn ( TcMonoBinds, idsToMonoBinds ) -import BasicTypes ( RecFlag(..), NewOrData(..) ) +import BasicTypes ( NewOrData(..) ) -import TcMonoType ( tcHsType, tcHsSigType, tcHsBoxedSigType, kcTyVarScope, tcClassContext, - kcHsContext, kcHsSigType, mkImmutTyVars +import TcMonoType ( tcHsTyVars, tcHsTheta, tcHsType, + kcHsContext, kcHsSigType, kcHsLiftedSigType ) -import TcEnv ( tcExtendTyVarEnv, tcLookupTy, tcLookupValueByKey, TyThing(..), TyThingDetails(..) ) +import TcEnv ( tcExtendTyVarEnv, + tcLookupTyCon, tcLookupRecId, + TyThingDetails(..), RecTcEnv + ) +import TcType ( tyVarsOfTypes, tyVarsOfPred, ThetaType ) import TcMonad -import TcUnify ( unifyKind ) -import Class ( Class, ClassContext ) -import DataCon ( DataCon, mkDataCon, - dataConFieldLabels, dataConId, dataConWrapId, - markedStrict, notMarkedStrict, markedUnboxed, dataConRepType - ) +import DataCon ( DataCon, mkDataCon, dataConFieldLabels ) +import FieldLabel ( fieldLabelName, fieldLabelType, allFieldLabelTags, mkFieldLabel ) import MkId ( mkDataConId, mkDataConWrapId, mkRecordSelId ) -import FieldLabel -import Var ( Id, TyVar ) -import Name ( Name, isLocallyDefined, OccName, NamedThing(..), nameUnique ) +import Var ( TyVar ) +import Name ( Name, NamedThing(..) ) import Outputable -import TyCon ( TyCon, AlgTyConFlavour(..), ArgVrcs, mkSynTyCon, mkAlgTyCon, - tyConDataConsIfAvailable, tyConTyVars, - isSynTyCon, isNewTyCon - ) -import Type ( getTyVar, tyVarsOfTypes, splitFunTy, applyTys, - mkTyConApp, mkTyVarTys, mkForAllTys, mkFunTy, - mkTyVarTy, splitAlgTyConApp_maybe, - mkArrowKind, mkArrowKinds, boxedTypeKind, - isUnboxedType, Type, ThetaType, classesOfPreds - ) -import TysWiredIn ( unitTy ) -import Var ( tyVarKind ) +import TyCon ( TyCon, DataConDetails(..), visibleDataCons, + tyConTyVars ) import VarSet ( intersectVarSet, isEmptyVarSet ) -import Unique ( unpackCStringIdKey, unpackCStringUtf8IdKey ) -import Util ( equivClasses ) -import FiniteMap ( FiniteMap, lookupWithDefaultFM ) +import PrelNames ( unpackCStringName, unpackCStringUtf8Name ) +import List ( nubBy ) \end{code} %************************************************************************ @@ -62,65 +44,40 @@ import FiniteMap ( FiniteMap, lookupWithDefaultFM ) %************************************************************************ \begin{code} -tcTyDecl1 :: RenamedTyClDecl -> TcM s (Name, TyThingDetails) -tcTyDecl1 (TySynonym tycon_name tyvar_names rhs src_loc) - = tcLookupTy tycon_name `thenNF_Tc` \ (ATyCon tycon) -> +tcTyDecl :: RenamedTyClDecl -> TcM (Name, TyThingDetails) +tcTyDecl (TySynonym {tcdName = tycon_name, tcdSynRhs = rhs}) + = 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) - = tcLookupTy tycon_name `thenNF_Tc` \ (ATyCon tycon) -> +tcTyDecl (TyData {tcdND = new_or_data, tcdCtxt = context, + tcdName = tycon_name, tcdCons = con_decls}) + = tcLookupTyCon tycon_name `thenNF_Tc` \ tycon -> let tyvars = tyConTyVars tycon in tcExtendTyVarEnv tyvars $ + tcHsTheta context `thenTc` \ ctxt -> + tcConDecls new_or_data tycon tyvars ctxt con_decls `thenTc` \ data_cons -> + let + sel_ids = mkRecordSelectors tycon data_cons + in + returnTc (tycon_name, DataTyDetails ctxt data_cons sel_ids) - -- Typecheck the pieces - tcClassContext context `thenTc` \ ctxt -> - tc_derivs derivings `thenTc` \ derived_classes -> - mapTc (tcConDecl new_or_data tycon tyvars ctxt) con_decls `thenTc` \ data_cons -> - - returnTc (tycon_name, DataTyDetails ctxt data_cons derived_classes) - where - tc_derivs Nothing = returnTc [] - tc_derivs (Just ds) = mapTc tc_deriv ds +tcTyDecl (ForeignType {tcdName = tycon_name}) + = returnTc (tycon_name, ForeignTyDetails) - tc_deriv name = tcLookupTy name `thenTc` \ (AClass clas) -> - returnTc clas -\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 - -mkNewTyConRep tc - = mkForAllTys tvs (loop [] (mkTyConApp tc (mkTyVarTys tvs))) +mkRecordSelectors tycon data_cons + = -- We'll check later that fields with the same name + -- from different constructors have the same type. + [ mkRecordSelId tycon field + | field <- nubBy eq_name fields ] 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 - } + fields = [ field | con <- visibleDataCons data_cons, + field <- dataConFieldLabels con ] + eq_name field1 field2 = fieldLabelName field1 == fieldLabelName field2 \end{code} @@ -131,77 +88,71 @@ mkNewTyConRep tc %************************************************************************ \begin{code} -kcConDetails :: RenamedContext -> ConDetails Name -> TcM s () -kcConDetails ex_ctxt details +kcConDetails :: NewOrData -> RenamedContext -> ConDetails Name -> TcM () +kcConDetails new_or_data ex_ctxt details = kcHsContext ex_ctxt `thenTc_` - kc_con_details details + mapTc_ kc_sig_type (conDetailsTys details) where - 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 s DataCon - -tcConDecl new_or_data tycon tyvars ctxt (ConDecl name wkr_name ex_tvs ex_ctxt details src_loc) - = tcAddSrcLoc src_loc $ - kcTyVarScope ex_tvs (kcConDetails ex_ctxt details) `thenTc` \ ex_tv_kinds -> - let - ex_tyvars = mkImmutTyVars ex_tv_kinds - in - tcExtendTyVarEnv 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 + kc_sig_type = case new_or_data of + DataType -> kcHsSigType + NewType -> kcHsLiftedSigType + -- Can't allow an unlifted type here, because we're effectively + -- going to remove the constructor while coercing it to a lifted type. + + +tcConDecls :: NewOrData -> TyCon -> [TyVar] -> ThetaType + -> DataConDetails RenamedConDecl -> TcM (DataConDetails DataCon) + +tcConDecls new_or_data tycon tyvars ctxt con_decls + = case con_decls of + Unknown -> returnTc Unknown + HasCons n -> returnTc (HasCons n) + DataCons cs -> mapTc tc_con_decl cs `thenTc` \ data_cons -> + returnTc (DataCons data_cons) 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. - - 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 [] - - 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 - mk_data_con ex_tyvars ex_theta arg_stricts - (map fieldLabelType field_labels) field_labels - - 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 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_wrap_id - - data_con_id = mkDataConId wkr_name data_con - data_con_wrap_id = mkDataConWrapId data_con - in - returnNF_Tc data_con + tc_con_decl (ConDecl name wkr_name ex_tvs ex_ctxt details src_loc) + = tcAddSrcLoc src_loc $ + tcHsTyVars ex_tvs (kcConDetails new_or_data ex_ctxt details) $ \ ex_tyvars -> + tcHsTheta 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_datacon ex_tyvars ex_theta btys + = mapTc tcHsType (map getBangType btys) `thenTc` \ arg_tys -> + mk_data_con ex_tyvars ex_theta (map getBangStrictness btys) arg_tys [] + + 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 + mk_data_con ex_tyvars ex_theta arg_stricts + (map fieldLabelType field_labels) field_labels + + tc_field ((field_label_names, bty), tag) + = tcHsType (getBangType bty) `thenTc` \ field_ty -> + returnTc [mkFieldLabel (getName name) tycon field_ty tag | name <- field_label_names] + + 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_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 @@ -209,86 +160,19 @@ 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 - -getBangStrictness (Banged _) = markedStrict -getBangStrictness (Unbanged _) = notMarkedStrict -getBangStrictness (Unpacked _) = markedUnboxed + in_arg_tys pred = not $ isEmptyVarSet $ + tyVarsOfPred pred `intersectVarSet` arg_tyvars \end{code} - %************************************************************************ %* * -\subsection{Generating constructor/selector bindings for data declarations} +\subsection{Errors and contexts} %* * %************************************************************************ -\begin{code} -mkImplicitDataBinds :: [TyCon] -> TcM s ([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) - -mkImplicitDataBinds_one tycon - = mapTc (mkRecordSelector tycon) groups `thenTc` \ sel_ids -> - let - unf_ids = sel_ids ++ data_con_wrapper_ids - all_ids = map dataConId data_cons ++ unf_ids - - -- For the locally-defined things - -- 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 (all_ids, binds) - where - data_cons = tyConDataConsIfAvailable tycon - -- Abstract types mean we don't bring the - -- data cons into scope, which should be fine - - data_con_wrapper_ids = map dataConWrapId data_cons - - fields = [ (con, field) | con <- data_cons, - field <- dataConFieldLabels con - ] - - -- groups is list of fields that share a common name - groups = equivClasses cmp_name fields - cmp_name (_, field1) (_, field2) - = fieldLabelName field1 `compare` fieldLabelName field2 -\end{code} - -\begin{code} -mkRecordSelector tycon fields@((first_con, first_field_label) : other_fields) - -- These fields all have the same name, but are from - -- different constructors in the data type - -- Check that all the fields in the group have the same type - -- This check assumes that all the constructors of a given - -- data type use the same type variables - = checkTc (all (== field_ty) other_tys) - (fieldTypeMisMatch field_name) `thenTc_` - tcLookupValueByKey unpackCStringIdKey `thenTc` \ unpack_id -> - tcLookupValueByKey unpackCStringUtf8IdKey `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] -\end{code} - -Errors and contexts -~~~~~~~~~~~~~~~~~~~ \begin{code} -fieldTypeMisMatch field_name - = sep [ptext SLIT("Declared types differ for field"), quotes (ppr field_name)] - exRecConErr name = ptext SLIT("Can't combine named fields with locally-quantified type variables") $$