X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Ftypecheck%2FTcTyDecls.lhs;h=8c1b9da7e758d780305c0ad3a6aa3bc5b130aead;hb=9d3463add032cf170615d3fe9fe4f3e7a1d99ff5;hp=ecc52e525426bf50b430644eadfc4339012c1eb5;hpb=438596897ebbe25a07e1c82085cfbc5bdb00f09e;p=ghc-hetmet.git diff --git a/ghc/compiler/typecheck/TcTyDecls.lhs b/ghc/compiler/typecheck/TcTyDecls.lhs index ecc52e5..8c1b9da 100644 --- a/ghc/compiler/typecheck/TcTyDecls.lhs +++ b/ghc/compiler/typecheck/TcTyDecls.lhs @@ -4,290 +4,191 @@ \section[TcTyDecls]{Typecheck type declarations} \begin{code} -module TcTyDecls ( - tcTyDecl, - tcConDecl, - mkDataBinds - ) where +module TcTyDecls ( tcTyDecl, kcConDetails, tcMkDataCon ) where #include "HsVersions.h" -import HsSyn ( MonoBinds(..), - TyDecl(..), ConDecl(..), ConDetails(..), BangType(..), - andMonoBindList +import HsSyn ( TyClDecl(..), ConDecl(..), HsConDetails(..), BangType, + getBangType, getBangStrictness, conDetailsTys ) -import RnHsSyn ( RenamedTyDecl, RenamedConDecl ) -import TcHsSyn ( TcMonoBinds ) -import BasicTypes ( RecFlag(..), NewOrData(..), StrictnessMark(..) ) +import RnHsSyn ( RenamedTyClDecl, RenamedConDecl, RenamedContext ) +import BasicTypes ( NewOrData(..), StrictnessMark ) -import Inst ( InstOrigin(..) ) -import TcMonoType ( tcHsTypeKind, tcHsType, tcContext ) -import TcEnv ( TcIdOcc(..), - tcLookupTyCon, tcLookupClass, - tcLookupTyVarBndrs +import TcMonoType ( tcHsTyVars, tcHsTheta, tcHsType, + kcHsContext, kcHsSigType, kcHsLiftedSigType ) -import TcMonad -import TcUnify ( unifyKind ) - -import Class ( Class ) -import DataCon ( DataCon, dataConSig, mkDataCon, isNullaryDataCon, - dataConFieldLabels, dataConId - ) -import MkId ( mkDataConId, mkRecordSelId ) -import Id ( getIdUnfolding ) -import CoreUnfold ( getUnfoldingTemplate ) -import FieldLabel -import Var ( Id, TyVar ) -import Name ( isLocallyDefined, OccName(..), NamedThing(..) ) +import TcEnv ( tcExtendTyVarEnv, tcLookupTyCon, TyThingDetails(..) ) +import TcType ( Type, tyVarsOfTypes, tyVarsOfPred, ThetaType ) +import RnEnv ( lookupSysName ) +import TcRnMonad + +import DataCon ( DataCon, mkDataCon, dataConFieldLabels ) +import FieldLabel ( FieldLabel, fieldLabelName, fieldLabelType, allFieldLabelTags, mkFieldLabel ) +import MkId ( mkDataConWorkId, mkDataConWrapId, mkRecordSelId ) +import Var ( TyVar ) +import Name ( Name ) +import OccName ( mkDataConWrapperOcc, mkDataConWorkerOcc, + mkGenOcc1, mkGenOcc2, setOccNameSpace ) import Outputable -import TyCon ( TyCon, mkSynTyCon, mkAlgTyCon, isAlgTyCon, - isSynTyCon, tyConDataCons - ) -import Type ( typeKind, getTyVar, tyVarsOfTypes, - mkTyConApp, mkTyVarTys, mkForAllTys, mkFunTy, - mkTyVarTy, - mkArrowKind, mkArrowKinds, boxedTypeKind, - isUnboxedType, Type, ThetaType - ) -import Var ( tyVarKind ) +import TyCon ( TyCon, DataConDetails(..), visibleDataCons, + tyConTyVars, tyConName ) import VarSet ( intersectVarSet, isEmptyVarSet ) -import Util ( equivClasses, panic, assertPanic ) -\end{code} - -\begin{code} -tcTyDecl :: RecFlag -> RenamedTyDecl -> TcM s TyCon +import Generics ( mkTyConGenInfo ) +import CmdLineOpts ( DynFlag(..) ) +import List ( nubBy ) \end{code} -Type synonym decls -~~~~~~~~~~~~~~~~~~ +%************************************************************************ +%* * +\subsection{Type checking} +%* * +%************************************************************************ \begin{code} -tcTyDecl is_rec (TySynonym tycon_name tyvar_names rhs src_loc) - = tcAddSrcLoc src_loc $ - tcAddErrCtxt (tySynCtxt tycon_name) $ - - -- 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) -> - - -- Unify tycon kind with (k1->...->kn->rhs) - unifyKind tycon_kind (mkArrowKinds tyvar_kinds rhs_kind) `thenTc_` +tcTyDecl :: RenamedTyClDecl -> TcM (Name, TyThingDetails) +tcTyDecl (TySynonym {tcdName = tycon_name, tcdSynRhs = rhs}) + = tcLookupTyCon tycon_name `thenM` \ tycon -> + tcExtendTyVarEnv (tyConTyVars tycon) $ + tcHsType rhs `thenM` \ rhs_ty -> + returnM (tycon_name, SynTyDetails rhs_ty) + +tcTyDecl (TyData {tcdND = new_or_data, tcdCtxt = context, + tcdName = tycon_name, tcdCons = con_decls, + tcdGeneric = generic}) + = tcLookupTyCon tycon_name `thenM` \ tycon -> 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 - 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 + tyvars = tyConTyVars tycon in - tcAddErrCtxt ctxt $ - - -- 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 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 -> + tcExtendTyVarEnv tyvars $ + tcHsTheta context `thenM` \ ctxt -> + tcConDecls new_or_data tycon tyvars ctxt con_decls `thenM` \ 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 - data_cons - derived_classes - Nothing -- Not a dictionary - real_data_or_new - is_rec + sel_ids = mkRecordSelectors tycon data_cons in - returnTc tycon - -tc_derivs Nothing = returnTc [] -tc_derivs (Just ds) = mapTc tc_deriv ds + tcGenericInfo tycon generic `thenM` \ gen_info -> + returnM (tycon_name, DataTyDetails ctxt data_cons sel_ids gen_info) -tc_deriv name - = tcLookupClass name `thenTc` \ (_, clas) -> - returnTc clas -\end{code} - -Generating constructor/selector bindings for data declarations -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +tcTyDecl (ForeignType {tcdName = tycon_name}) + = returnM (tycon_name, ForeignTyDetails) -\begin{code} -mkDataBinds :: [TyCon] -> TcM s ([Id], TcMonoBinds s) -mkDataBinds [] = returnTc ([], EmptyMonoBinds) -mkDataBinds (tycon : tycons) - | isSynTyCon tycon = mkDataBinds tycons - | otherwise = mkDataBinds_one tycon `thenTc` \ (ids1, b1) -> - mkDataBinds tycons `thenTc` \ (ids2, b2) -> - returnTc (ids1++ids2, b1 `AndMonoBinds` b2) -mkDataBinds_one tycon - = ASSERT( isAlgTyCon tycon ) - mapTc (mkRecordSelector tycon) groups `thenTc` \ sel_ids -> - let - data_ids = map dataConId data_cons ++ sel_ids - - -- 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)) - | data_id <- data_ids, isLocallyDefined data_id - ] - in - returnTc (data_ids, andMonoBindList binds) +tcGenericInfo tycon generics -- Source code decl: consult the flag + = do_we_want generics `thenM` \ want_generics -> + if want_generics then + mapM (lookupSysName (tyConName tycon)) + [mkGenOcc1, mkGenOcc2] `thenM` \ gen_sys_names -> + returnM (mkTyConGenInfo tycon gen_sys_names) + else + returnM Nothing where - data_cons = tyConDataCons tycon - 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 + do_we_want (Just g) = returnM g -- Interface file decl + -- so look at decl + do_we_want Nothing = doptM Opt_Generics -- Source code decl + -- so look at flag + +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 + fields = [ field | con <- visibleDataCons data_cons, + field <- dataConFieldLabels con ] + eq_name field1 field2 = fieldLabelName field1 == 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_` - returnTc selector_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} +%************************************************************************ +%* * +\subsection{Kind and type check constructors} +%* * +%************************************************************************ -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 +kcConDetails :: NewOrData -> RenamedContext + -> HsConDetails Name (BangType Name) -> TcM () +kcConDetails new_or_data ex_ctxt details + = kcHsContext ex_ctxt `thenM_` + mappM_ kc_sig_type (conDetailsTys details) + where + 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 -> returnM Unknown + HasCons n -> returnM (HasCons n) + DataCons cs -> mappM tc_con_decl cs `thenM` \ data_cons -> + returnM (DataCons data_cons) + where + tc_con_decl (ConDecl name ex_tvs ex_ctxt details src_loc) + = addSrcLoc src_loc $ + tcHsTyVars ex_tvs (kcConDetails new_or_data ex_ctxt details) $ \ ex_tyvars -> + tcHsTheta ex_ctxt `thenM` \ ex_theta -> + case details of + PrefixCon 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 + = mappM tcHsType (map getBangType btys) `thenM` \ arg_tys -> + tcMkDataCon name + (map getBangStrictness btys) + [{- No field labels -}] + tyvars ctxt ex_tyvars ex_theta + arg_tys tycon -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 -> + tc_rec_con ex_tyvars ex_theta fields + = checkTc (null ex_tyvars) (exRecConErr name) `thenM_` + mappM tc_field (fields `zip` allFieldLabelTags) `thenM` \ field_labels -> + let + arg_stricts = [getBangStrictness bty | (n, bty) <- fields] + arg_tys = map fieldLabelType field_labels + in + tcMkDataCon name arg_stricts field_labels + tyvars ctxt ex_tyvars ex_theta + arg_tys tycon + + tc_field ((field_label_name, bty), tag) + = tcHsType (getBangType bty) `thenM` \ field_ty -> + returnM (mkFieldLabel field_label_name tycon field_ty tag) + +tcMkDataCon :: Name + -> [StrictnessMark] -> [FieldLabel] + -> [TyVar] -> ThetaType + -> [TyVar] -> ThetaType + -> [Type] -> TyCon + -> TcM 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) +tcMkDataCon src_name arg_stricts fields + tyvars ctxt ex_tyvars ex_theta + arg_tys tycon + = lookupSysName src_name mkDataConWrapperOcc `thenM` \ wrap_name -> + lookupSysName src_name mkDataConWorkerOcc `thenM` \ work_name -> + -- This last one takes the name of the data constructor in the source + -- code, which (for Haskell source anyway) will be in the SrcDataName name + -- space, and makes it into a "real data constructor name" 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 + data_con = mkDataCon src_name arg_stricts fields + tyvars (thinContext arg_tys ctxt) + ex_tyvars ex_theta + arg_tys tycon + data_con_work_id data_con_wrap_id + data_con_work_id = mkDataConWorkId work_name data_con + data_con_wrap_id = mkDataConWrapId wrap_name data_con in - returnTc data_con + returnM data_con -- The context for a data constructor should be limited to -- the type variables mentioned in the arg_tys @@ -295,37 +196,19 @@ 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 - -get_strictness (Banged _) = MarkedStrict -get_strictness (Unbanged _) = NotMarkedStrict - -get_pty (Banged ty) = ty -get_pty (Unbanged ty) = ty + in_arg_tys pred = not $ isEmptyVarSet $ + tyVarsOfPred pred `intersectVarSet` arg_tyvars \end{code} +%************************************************************************ +%* * +\subsection{Errors and contexts} +%* * +%************************************************************************ -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)] +\begin{code} exRecConErr name = ptext SLIT("Can't combine named fields with locally-quantified type variables") $$