X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2FhsSyn%2FHsDecls.lhs;h=c770386411f75c2c4acdc3fed4f3b1a6d1e78d71;hp=644050e6b2649734312b968ab7027028476127fb;hb=432b9c9322181a3644083e3c19b7e240d90659e7;hpb=9bcd95bad83ee937c178970e8b729732e680fe1e diff --git a/compiler/hsSyn/HsDecls.lhs b/compiler/hsSyn/HsDecls.lhs index 644050e..c770386 100644 --- a/compiler/hsSyn/HsDecls.lhs +++ b/compiler/hsSyn/HsDecls.lhs @@ -41,8 +41,8 @@ module HsDecls ( ForeignDecl(..), LForeignDecl, ForeignImport(..), ForeignExport(..), CImportSpec(..), FoType(..), -- ** Data-constructor declarations - ConDecl(..), LConDecl, ResType(..), ConDeclField(..), - HsConDeclDetails, hsConDeclArgTys, + ConDecl(..), LConDecl, ResType(..), + HsConDeclDetails, hsConDeclArgTys, hsConDeclsNames, -- ** Document comments DocDecl(..), LDocDecl, docDeclDoc, -- ** Deprecations @@ -406,8 +406,8 @@ data TyClDecl name } - | -- | @type/data/newtype family T :: *->*@ - TyFamily { tcdFlavour:: FamilyFlavour, -- type, new, or data + | -- | @type/data family T :: *->*@ + TyFamily { tcdFlavour:: FamilyFlavour, -- type or data tcdLName :: Located name, -- type constructor tcdTyVars :: [LHsTyVarBndr name], -- type variables tcdKind :: Maybe Kind -- result kind @@ -534,10 +534,10 @@ tcdName :: TyClDecl name -> name tcdName decl = unLoc (tcdLName decl) tyClDeclNames :: Eq name => TyClDecl name -> [Located name] --- Returns all the *binding* names of the decl, along with their SrcLocs --- The first one is guaranteed to be the name of the decl --- For record fields, the first one counts as the SrcLoc --- We use the equality to filter out duplicate field names +-- ^ Returns all the /binding/ names of the decl, along with their SrcLocs. +-- The first one is guaranteed to be the name of the decl. For record fields +-- mentioned in multiple constructors, the SrcLoc will be from the first +-- occurence. We use the equality to filter out duplicate field names tyClDeclNames (TyFamily {tcdLName = name}) = [name] tyClDeclNames (TySynonym {tcdLName = name}) = [name] @@ -548,7 +548,7 @@ tyClDeclNames (ClassDecl {tcdLName = cls_name, tcdSigs = sigs, tcdATs = ats}) concatMap (tyClDeclNames . unLoc) ats ++ [n | L _ (TypeSig n _) <- sigs] tyClDeclNames (TyData {tcdLName = tc_name, tcdCons = cons}) - = tc_name : conDeclsNames (map unLoc cons) + = tc_name : hsConDeclsNames cons tyClDeclTyVars :: TyClDecl name -> [LHsTyVarBndr name] tyClDeclTyVars (TyFamily {tcdTyVars = tvs}) = tvs @@ -693,22 +693,38 @@ type LConDecl name = Located (ConDecl name) data ConDecl name = ConDecl - { con_name :: Located name -- Constructor name; this is used for the - -- DataCon itself, and for the user-callable wrapper Id - - , con_explicit :: HsExplicitForAll -- Is there an user-written forall? (cf. HStypes.HsForAllTy) - - , con_qvars :: [LHsTyVarBndr name] -- ResTyH98: the constructor's existential type variables - -- ResTyGADT: all the constructor's quantified type variables - - , con_cxt :: LHsContext name -- The context. This *does not* include the - -- "stupid theta" which lives only in the TyData decl - - , con_details :: HsConDeclDetails name -- The main payload - - , con_res :: ResType name -- Result type of the constructor - - , con_doc :: Maybe (LHsDoc name) -- A possible Haddock comment + { con_name :: Located name + -- ^ Constructor name. This is used for the DataCon itself, and for + -- the user-callable wrapper Id. + + , con_explicit :: HsExplicitForAll + -- ^ Is there an user-written forall? (cf. 'HsTypes.HsForAllTy') + + , con_qvars :: [LHsTyVarBndr name] + -- ^ Type variables. Depending on 'con_res' this describes the + -- follewing entities + -- + -- - ResTyH98: the constructor's *existential* type variables + -- - ResTyGADT: *all* the constructor's quantified type variables + + , con_cxt :: LHsContext name + -- ^ The context. This /does not/ include the \"stupid theta\" which + -- lives only in the 'TyData' decl. + + , con_details :: HsConDeclDetails name + -- ^ The main payload + + , con_res :: ResType name + -- ^ Result type of the constructor + + , con_doc :: Maybe (LHsDoc name) + -- ^ A possible Haddock comment. + + , con_old_rec :: Bool + -- ^ TEMPORARY field; True <=> user has employed now-deprecated syntax for + -- GADT-style record decl C { blah } :: T a b + -- Remove this when we no longer parse this stuff, and hence do not + -- need to report decprecated use } type HsConDeclDetails name = HsConDetails (LBangType name) [ConDeclField name] @@ -718,33 +734,33 @@ hsConDeclArgTys (PrefixCon tys) = tys hsConDeclArgTys (InfixCon ty1 ty2) = [ty1,ty2] hsConDeclArgTys (RecCon flds) = map cd_fld_type flds -data ConDeclField name -- Record fields have Haddoc docs on them - = ConDeclField { cd_fld_name :: Located name, - cd_fld_type :: LBangType name, - cd_fld_doc :: Maybe (LHsDoc name) } - data ResType name = ResTyH98 -- Constructor was declared using Haskell 98 syntax | ResTyGADT (LHsType name) -- Constructor was declared using GADT-style syntax, -- and here is its result type + +instance OutputableBndr name => Outputable (ResType name) where + -- Debugging only + ppr ResTyH98 = ptext (sLit "ResTyH98") + ppr (ResTyGADT ty) = ptext (sLit "ResTyGADT") <+> pprParendHsType (unLoc ty) \end{code} \begin{code} -conDeclsNames :: (Eq name) => [ConDecl name] -> [Located name] +hsConDeclsNames :: (Eq name) => [LConDecl name] -> [Located name] -- See tyClDeclNames for what this does -- The function is boringly complicated because of the records -- And since we only have equality, we have to be a little careful -conDeclsNames cons +hsConDeclsNames cons = snd (foldl do_one ([], []) cons) where - do_one (flds_seen, acc) (ConDecl { con_name = lname, con_details = RecCon flds }) + do_one (flds_seen, acc) (L _ (ConDecl { con_name = lname, con_details = RecCon flds })) = (map unLoc new_flds ++ flds_seen, lname : new_flds ++ acc) where new_flds = filterOut (\f -> unLoc f `elem` flds_seen) (map cd_fld_name flds) - do_one (flds_seen, acc) c - = (flds_seen, (con_name c):acc) + do_one (flds_seen, acc) (L _ (ConDecl { con_name = lname })) + = (flds_seen, lname:acc) \end{code} @@ -753,33 +769,31 @@ instance (OutputableBndr name) => Outputable (ConDecl name) where ppr = pprConDecl pprConDecl :: OutputableBndr name => ConDecl name -> SDoc -pprConDecl (ConDecl con expl tvs cxt details ResTyH98 doc) +pprConDecl (ConDecl { con_name =con, con_explicit = expl, con_qvars = tvs + , con_cxt = cxt, con_details = details + , con_res = ResTyH98, con_doc = doc }) = sep [ppr_mbDoc doc, pprHsForAll expl tvs cxt, ppr_details con details] where ppr_details con (InfixCon t1 t2) = hsep [ppr t1, pprHsInfix con, ppr t2] ppr_details con (PrefixCon tys) = hsep (pprHsVar con : map ppr tys) - ppr_details con (RecCon fields) = ppr con <+> ppr_fields fields + ppr_details con (RecCon fields) = ppr con <+> pprConDeclFields fields -pprConDecl (ConDecl con expl tvs cxt (PrefixCon arg_tys) (ResTyGADT res_ty) _) +pprConDecl (ConDecl { con_name = con, con_explicit = expl, con_qvars = tvs + , con_cxt = cxt, con_details = PrefixCon arg_tys + , con_res = ResTyGADT res_ty }) = ppr con <+> dcolon <+> sep [pprHsForAll expl tvs cxt, ppr (foldr mk_fun_ty res_ty arg_tys)] where mk_fun_ty a b = noLoc (HsFunTy a b) -pprConDecl (ConDecl con expl tvs cxt (RecCon fields) (ResTyGADT res_ty) _) - = sep [pprHsForAll expl tvs cxt, ppr con <+> ppr_fields fields <+> dcolon <+> ppr res_ty] +pprConDecl (ConDecl { con_name = con, con_explicit = expl, con_qvars = tvs + , con_cxt = cxt, con_details = RecCon fields, con_res = ResTyGADT res_ty }) + = sep [ppr con <+> dcolon <+> pprHsForAll expl tvs cxt, + pprConDeclFields fields <+> arrow <+> ppr res_ty] -pprConDecl (ConDecl con _expl _tvs _cxt (InfixCon _ _) (ResTyGADT _res_ty) _) +pprConDecl (ConDecl {con_name = con, con_details = InfixCon {}, con_res = ResTyGADT {} }) = pprPanic "pprConDecl" (ppr con) -- In GADT syntax we don't allow infix constructors - - -ppr_fields :: OutputableBndr name => [ConDeclField name] -> SDoc -ppr_fields fields = braces (sep (punctuate comma (map ppr_fld fields))) - where - ppr_fld (ConDeclField { cd_fld_name = n, cd_fld_type = ty, - cd_fld_doc = doc }) - = ppr n <+> dcolon <+> ppr ty <+> ppr_mbDoc doc \end{code} %************************************************************************ @@ -893,7 +907,6 @@ data ForeignImport = -- import of a C entity CImport CCallConv -- ccall or stdcall Safety -- safe or unsafe FastString -- name of C header - FastString -- name of library object CImportSpec -- details of the C entity -- import of a .NET function @@ -933,22 +946,19 @@ instance OutputableBndr name => Outputable (ForeignDecl name) where instance Outputable ForeignImport where ppr (DNImport spec) = ptext (sLit "dotnet") <+> ppr spec - ppr (CImport cconv safety header lib spec) = + ppr (CImport cconv safety header spec) = ppr cconv <+> ppr safety <+> - char '"' <> pprCEntity header lib spec <> char '"' + char '"' <> pprCEntity spec <> char '"' where - pprCEntity header lib (CLabel lbl) = - ptext (sLit "static") <+> ftext header <+> char '&' <> - pprLib lib <> ppr lbl - pprCEntity header lib (CFunction (StaticTarget lbl)) = - ptext (sLit "static") <+> ftext header <+> char '&' <> - pprLib lib <> ppr lbl - pprCEntity _ _ (CFunction (DynamicTarget)) = + pp_hdr = if nullFS header then empty else ftext header + + pprCEntity (CLabel lbl) = + ptext (sLit "static") <+> pp_hdr <+> char '&' <> ppr lbl + pprCEntity (CFunction (StaticTarget lbl)) = + ptext (sLit "static") <+> pp_hdr <+> ppr lbl + pprCEntity (CFunction (DynamicTarget)) = ptext (sLit "dynamic") - pprCEntity _ _ (CWrapper) = ptext (sLit "wrapper") - -- - pprLib lib | nullFS lib = empty - | otherwise = char '[' <> ppr lib <> char ']' + pprCEntity (CWrapper) = ptext (sLit "wrapper") instance Outputable ForeignExport where ppr (CExport (CExportStatic lbl cconv)) =