X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypecheck%2FTcTyClsDecls.lhs;h=5574b76071343adf21b8a7751187ccfd06313097;hb=84923cc7de2a93c22a2f72daf9ac863959efae13;hp=0c0c93aeb5d390d397f14b3972fa52cb4ed5cfb9;hpb=24bb49b71bce13faa263386e68d49fc0b05557b7;p=ghc-hetmet.git diff --git a/compiler/typecheck/TcTyClsDecls.lhs b/compiler/typecheck/TcTyClsDecls.lhs index 0c0c93a..5574b76 100644 --- a/compiler/typecheck/TcTyClsDecls.lhs +++ b/compiler/typecheck/TcTyClsDecls.lhs @@ -1,7 +1,9 @@ % +% (c) The University of Glasgow 2006 % (c) The AQUA Project, Glasgow University, 1996-1998 % -\section[TcTyClsDecls]{Typecheck type and class declarations} + +TcTyClsDecls: Typecheck type and class declarations \begin{code} module TcTyClsDecls ( @@ -10,70 +12,38 @@ module TcTyClsDecls ( #include "HsVersions.h" -import HsSyn ( TyClDecl(..), HsConDetails(..), HsTyVarBndr(..), - ConDecl(..), Sig(..), NewOrData(..), ResType(..), - tyClDeclTyVars, isSynDecl, isClassDecl, isIdxTyDecl, - isKindSigDecl, hsConArgs, LTyClDecl, tcdName, - hsTyVarName, LHsTyVarBndr, LHsType, HsType(..), - mkHsAppTy - ) -import HsTypes ( HsBang(..), getBangStrictness, hsLTyVarNames ) -import BasicTypes ( RecFlag(..), StrictnessMark(..) ) -import HscTypes ( implicitTyThings, ModDetails ) -import BuildTyCl ( buildClass, buildAlgTyCon, buildSynTyCon, buildDataCon, - mkDataTyConRhs, mkNewTyConRhs ) +import HsSyn +import HsTypes +import BasicTypes +import HscTypes +import BuildTyCl import TcRnMonad -import TcEnv ( TyThing(..), - tcLookupLocated, tcLookupLocatedGlobal, - tcExtendGlobalEnv, tcExtendKindEnv, - tcExtendKindEnvTvs, newFamInstTyConName, - tcExtendRecEnv, tcLookupTyVar, InstInfo, - tcLookupLocatedTyCon ) -import TcTyDecls ( calcRecFlags, calcClassCycles, calcSynCycles ) -import TcClassDcl ( tcClassSigs, tcAddDeclCtxt ) -import TcHsType ( kcHsTyVars, kcHsLiftedSigType, kcHsType, - kcHsContext, tcTyVarBndrs, tcHsKindedType, tcHsKindedContext, - kcHsSigType, tcHsBangType, tcLHsConResTy, - tcDataKindSig, kcCheckHsType ) -import TcMType ( newKindVar, checkValidTheta, checkValidType, - -- checkFreeness, - UserTypeCtxt(..), SourceTyCtxt(..) ) -import TcType ( TcKind, TcType, Type, tyVarsOfType, mkPhiTy, - mkArrowKind, liftedTypeKind, mkTyVarTys, - tcSplitSigmaTy, tcEqTypes, tcGetTyVar_maybe ) -import Type ( PredType(..), splitTyConApp_maybe, mkTyVarTy, - newTyConInstRhs, isLiftedTypeKind, Kind - -- pprParendType, pprThetaArrow - ) -import Generics ( validGenericMethodType, canDoGenerics ) -import Class ( Class, className, classTyCon, DefMeth(..), classBigSig, classTyVars ) -import TyCon ( TyCon, AlgTyConRhs( AbstractTyCon, OpenDataTyCon, - OpenNewTyCon ), - SynTyConRhs( OpenSynTyCon, SynonymTyCon ), - tyConDataCons, mkForeignTyCon, isProductTyCon, - isRecursiveTyCon, isOpenTyCon, - tyConStupidTheta, synTyConRhs, isSynTyCon, tyConName, - isNewTyCon, isDataTyCon, tyConKind, - setTyConArgPoss ) -import DataCon ( DataCon, dataConUserType, dataConName, - dataConFieldLabels, dataConTyCon, dataConAllTyVars, - dataConFieldType, dataConResTys ) -import Var ( TyVar, idType, idName ) -import VarSet ( elemVarSet, mkVarSet ) -import Name ( Name, getSrcLoc ) +import TcEnv +import TcTyDecls +import TcClassDcl +import TcHsType +import TcMType +import TcType +import Type +import Generics +import Class +import TyCon +import DataCon +import Var +import VarSet +import Name +import OccName import Outputable -import Maybe ( isJust, fromJust, isNothing, catMaybes ) -import Maybes ( expectJust ) -import Monad ( unless ) -import Unify ( tcMatchTys, tcMatchTyX ) -import Util ( zipLazy, isSingleton, notNull, sortLe ) -import List ( partition, elemIndex ) -import SrcLoc ( Located(..), unLoc, getLoc, srcLocSpan, - srcSpanStart ) -import ListSetOps ( equivClasses, minusList ) -import Digraph ( SCC(..) ) -import DynFlags ( DynFlag( Opt_GlasgowExts, Opt_Generics, - Opt_UnboxStrictFields, Opt_IndexedTypes ) ) +import Maybes +import Monad +import Unify +import Util +import SrcLoc +import ListSetOps +import Digraph +import DynFlags + +import Data.List ( partition, elemIndex ) \end{code} @@ -196,6 +166,7 @@ tcTyAndClassDecls boot_details allDecls ; let { -- Calculate rec-flag ; calc_rec = calcRecFlags boot_details rec_alg_tyclss ; tc_decl = addLocM (tcTyClDecl calc_rec) } + -- Type-check the type synonyms, and extend the envt ; syn_tycons <- tcSynDecls kc_syn_decls ; tcExtendGlobalEnv syn_tycons $ do @@ -260,11 +231,10 @@ they share a lot of kinding and type checking code with ordinary algebraic data types (and GADTs). \begin{code} -tcIdxTyInstDecl :: LTyClDecl Name - -> TcM (Maybe InstInfo, Maybe TyThing) -- Nothing if error +tcIdxTyInstDecl :: LTyClDecl Name -> TcM (Maybe TyThing) -- Nothing if error tcIdxTyInstDecl (L loc decl) = -- Prime error recovery, set source location - recoverM (returnM (Nothing, Nothing)) $ + recoverM (returnM Nothing) $ setSrcSpan loc $ tcAddDeclCtxt decl $ do { -- indexed data types require -findexed-types and can't be in an @@ -278,8 +248,7 @@ tcIdxTyInstDecl (L loc decl) ; tcIdxTyInstDecl1 decl } -tcIdxTyInstDecl1 :: TyClDecl Name - -> TcM (Maybe InstInfo, Maybe TyThing) -- Nothing if error +tcIdxTyInstDecl1 :: TyClDecl Name -> TcM (Maybe TyThing) -- Nothing if error tcIdxTyInstDecl1 (decl@TySynonym {}) = kcIdxTyPats decl $ \k_tvs k_typats resKind family -> @@ -295,9 +264,8 @@ tcIdxTyInstDecl1 (decl@TySynonym {}) ; t_typats <- mappM tcHsKindedType k_typats ; t_rhs <- tcHsKindedType k_rhs - -- construct type rewrite rule -- !!!of the form: forall t_tvs. (tcdLName decl) t_typats = t_rhs - ; return (Nothing, Nothing) -- !!!TODO: need InstInfo for eq axioms + ; return Nothing -- !!!TODO: need TyThing for indexed synonym }} tcIdxTyInstDecl1 (decl@TyData {tcdND = new_or_data, tcdLName = L loc tc_name, @@ -350,7 +318,7 @@ tcIdxTyInstDecl1 (decl@TyData {tcdND = new_or_data, tcdLName = L loc tc_name, }) -- construct result - ; return (Nothing, Just (ATyCon tycon)) + ; return $ Just (ATyCon tycon) }} where h98_syntax = case cons of -- All constructors have same shape @@ -382,7 +350,7 @@ kcIdxTyPats decl thing_inside -- type functions can have a higher-kinded result ; let resultKind = mkArrowKinds (drop (length hs_typats) kinds) resKind - ; typats <- zipWithM kcCheckHsType hs_typats kinds + ; typats <- TcRnMonad.zipWithM kcCheckHsType hs_typats kinds ; thing_inside tvs typats resultKind family } where @@ -575,14 +543,15 @@ kcDataDecl decl@(TyData {tcdND = new_or_data, tcdCtxt = ctxt, tcdCons = cons}) ; cons' <- mappM (wrapLocM kc_con_decl) cons ; return (decl {tcdTyVars = tvs, tcdCtxt = ctxt', tcdCons = cons'}) } where - kc_con_decl (ConDecl name expl ex_tvs ex_ctxt details res) = do + -- doc comments are typechecked to Nothing here + kc_con_decl (ConDecl name expl ex_tvs ex_ctxt details res _) = do kcHsTyVars ex_tvs $ \ex_tvs' -> do ex_ctxt' <- kcHsContext ex_ctxt details' <- kc_con_details details res' <- case res of ResTyH98 -> return ResTyH98 ResTyGADT ty -> do { ty' <- kcHsSigType ty; return (ResTyGADT ty') } - return (ConDecl name expl ex_tvs' ex_ctxt' details' res') + return (ConDecl name expl ex_tvs' ex_ctxt' details' res' Nothing) kc_con_details (PrefixCon btys) = do { btys' <- mappM kc_larg_ty btys ; return (PrefixCon btys') } @@ -591,7 +560,7 @@ kcDataDecl decl@(TyData {tcdND = new_or_data, tcdCtxt = ctxt, tcdCons = cons}) kc_con_details (RecCon fields) = do { fields' <- mappM kc_field fields; return (RecCon fields') } - kc_field (fld, bty) = do { bty' <- kc_larg_ty bty ; return (fld, bty') } + kc_field (HsRecField fld bty d) = do { bty' <- kc_larg_ty bty ; return (HsRecField fld bty' d) } kc_larg_ty bty = case new_or_data of DataType -> kcHsSigType bty @@ -772,7 +741,7 @@ tcConDecl :: Bool -- True <=> -funbox-strict_fields -> TcM DataCon tcConDecl unbox_strict NewType tycon tc_tvs -- Newtypes - (ConDecl name _ ex_tvs ex_ctxt details ResTyH98) + (ConDecl name _ ex_tvs ex_ctxt details ResTyH98 _) = do { let tc_datacon field_lbls arg_ty = do { arg_ty' <- tcHsKindedType arg_ty -- No bang on newtype ; buildDataCon (unLoc name) False {- Prefix -} @@ -788,23 +757,24 @@ tcConDecl unbox_strict NewType tycon tc_tvs -- Newtypes ; case details of PrefixCon [arg_ty] -> tc_datacon [] arg_ty - RecCon [(field_lbl, arg_ty)] -> tc_datacon [field_lbl] arg_ty + RecCon [HsRecField field_lbl arg_ty _] -> tc_datacon [field_lbl] arg_ty other -> failWithTc (newtypeFieldErr name (length (hsConArgs details))) -- Check that the constructor has exactly one field } tcConDecl unbox_strict DataType tycon tc_tvs -- Data types - (ConDecl name _ tvs ctxt details res_ty) + (ConDecl name _ tvs ctxt details res_ty _) = tcTyVarBndrs tvs $ \ tvs' -> do { ctxt' <- tcHsKindedContext ctxt ; (univ_tvs, ex_tvs, eq_preds, data_tc) <- tcResultType tycon tc_tvs tvs' res_ty ; let + -- Tiresome: tidy the tyvar binders, since tc_tvs and tvs' may have the same OccNames tc_datacon is_infix field_lbls btys = do { let bangs = map getBangStrictness btys ; arg_tys <- mappM tcHsBangType btys ; buildDataCon (unLoc name) is_infix - (argStrictness unbox_strict tycon bangs arg_tys) + (argStrictness unbox_strict bangs arg_tys) (map unLoc field_lbls) univ_tvs ex_tvs eq_preds ctxt' arg_tys data_tc } @@ -817,7 +787,7 @@ tcConDecl unbox_strict DataType tycon tc_tvs -- Data types InfixCon bty1 bty2 -> tc_datacon True [] [bty1,bty2] RecCon fields -> tc_datacon False field_names btys where - (field_names, btys) = unzip fields + (field_names, btys) = unzip [ (n, t) | HsRecField n t _ <- fields ] } @@ -826,7 +796,7 @@ tcResultType :: TyCon -> [TyVar] -- where MkT :: forall a b c. ... -> ResType Name -> TcM ([TyVar], -- Universal - [TyVar], -- Existential + [TyVar], -- Existential (distinct OccNames from univs) [(TyVar,Type)], -- Equality predicates TyCon) -- TyCon given in the ResTy -- We don't check that the TyCon given in the ResTy is @@ -846,8 +816,8 @@ tcResultType _ tc_tvs dc_tvs (ResTyGADT res_ty) -- ([a,z,c], [x,y], [a:=:(x,y), c:=:z], T) = do { (dc_tycon, res_tys) <- tcLHsConResTy res_ty - -- NB: tc_tvs and dc_tvs are distinct - ; let univ_tvs = choose_univs [] tc_tvs res_tys + + ; let univ_tvs = choose_univs [] tidy_tc_tvs res_tys -- Each univ_tv is either a dc_tv or a tc_tv ex_tvs = dc_tvs `minusList` univ_tvs eq_spec = [ (tv, ty) | (tv,ty) <- univ_tvs `zip` res_tys, @@ -864,13 +834,25 @@ tcResultType _ tc_tvs dc_tvs (ResTyGADT res_ty) | otherwise = tc_tv : choose_univs used tc_tvs res_tys -------------------- + -- NB: tc_tvs and dc_tvs are distinct, but + -- we want them to be *visibly* distinct, both for + -- interface files and general confusion. So rename + -- the tc_tvs, since they are not used yet (no + -- consequential renaming needed) + init_occ_env = initTidyOccEnv (map getOccName dc_tvs) + (_, tidy_tc_tvs) = mapAccumL tidy_one init_occ_env tc_tvs + tidy_one env tv = (env', setTyVarName tv (tidyNameOcc name occ')) + where + name = tyVarName tv + (env', occ') = tidyOccName env (getOccName name) + + ------------------- argStrictness :: Bool -- True <=> -funbox-strict_fields - -> TyCon -> [HsBang] + -> [HsBang] -> [TcType] -> [StrictnessMark] -argStrictness unbox_strict tycon bangs arg_tys +argStrictness unbox_strict bangs arg_tys = ASSERT( length bangs == length arg_tys ) - zipWith (chooseBoxingStrategy unbox_strict tycon) arg_tys bangs + zipWith (chooseBoxingStrategy unbox_strict) arg_tys bangs -- We attempt to unbox/unpack a strict field when either: -- (i) The field is marked '!!', or @@ -878,8 +860,8 @@ argStrictness unbox_strict tycon bangs arg_tys -- -- We have turned off unboxing of newtypes because coercions make unboxing -- and reboxing more complicated -chooseBoxingStrategy :: Bool -> TyCon -> TcType -> HsBang -> StrictnessMark -chooseBoxingStrategy unbox_strict_fields tycon arg_ty bang +chooseBoxingStrategy :: Bool -> TcType -> HsBang -> StrictnessMark +chooseBoxingStrategy unbox_strict_fields arg_ty bang = case bang of HsNoBang -> NotMarkedStrict HsStrict | unbox_strict_fields @@ -892,13 +874,21 @@ chooseBoxingStrategy unbox_strict_fields tycon arg_ty bang can_unbox arg_ty = case splitTyConApp_maybe arg_ty of Nothing -> False Just (arg_tycon, tycon_args) -> - not (isRecursiveTyCon tycon) && + not (isRecursiveTyCon arg_tycon) && -- Note [Recusive unboxing] isProductTyCon arg_tycon && (if isNewTyCon arg_tycon then can_unbox (newTyConInstRhs arg_tycon tycon_args) else True) \end{code} +Note [Recursive unboxing] +~~~~~~~~~~~~~~~~~~~~~~~~~ +Be careful not to try to unbox this! + data T = MkT !T Int +But it's the *argument* type that matters. This is fine: + data S = MkS S !Int +because Int is non-recursive. + %************************************************************************ %* * \subsection{Dependency analysis} @@ -1160,7 +1150,7 @@ newtypeFieldErr con_name n_flds badSigTyDecl tc_name = vcat [ ptext SLIT("Illegal kind signature") <+> quotes (ppr tc_name) - , nest 2 (parens $ ptext SLIT("Use -fglasgow-exts to allow indexed types")) ] + , nest 2 (parens $ ptext SLIT("Use -findexed-types to allow indexed types")) ] badKindSigCtxt tc_name = vcat [ ptext SLIT("Illegal context in kind signature") <+> @@ -1170,7 +1160,7 @@ badKindSigCtxt tc_name badIdxTyDecl tc_name = vcat [ ptext SLIT("Illegal indexed type instance for") <+> quotes (ppr tc_name) - , nest 2 (parens $ ptext SLIT("Use -fglasgow-exts to allow indexed types")) ] + , nest 2 (parens $ ptext SLIT("Use -findexed-types to allow indexed types")) ] badGadtIdxTyDecl tc_name = vcat [ ptext SLIT("Illegal generalised algebraic data declaration for") <+>