X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Ftypecheck%2FTcGenDeriv.lhs;h=28ae0d965a92765e5249b89aa497fb1ae7e22a94;hb=c0ecf485676289ce297917bb57b4bbd2e159d7d9;hp=2c32c8c3595a719d91715072e9a0b758d1202ae5;hpb=7e602b0a11e567fcb035d1afd34015aebcf9a577;p=ghc-hetmet.git diff --git a/ghc/compiler/typecheck/TcGenDeriv.lhs b/ghc/compiler/typecheck/TcGenDeriv.lhs index 2c32c8c..28ae0d9 100644 --- a/ghc/compiler/typecheck/TcGenDeriv.lhs +++ b/ghc/compiler/typecheck/TcGenDeriv.lhs @@ -28,36 +28,43 @@ module TcGenDeriv ( import HsSyn ( InPat(..), HsExpr(..), MonoBinds(..), Match(..), GRHSs(..), Stmt(..), HsLit(..), - HsBinds(..), StmtCtxt(..), + HsBinds(..), StmtCtxt(..), HsType(..), unguardedRHS, mkSimpleMatch ) -import RdrHsSyn ( RdrName(..), varUnqual, mkOpApp, - RdrNameMonoBinds, RdrNameHsExpr, RdrNamePat +import RdrHsSyn ( mkOpApp, RdrNameMonoBinds, RdrNameHsExpr, RdrNamePat ) +import RdrName ( RdrName, mkSrcUnqual ) +import RnMonad ( Fixities ) +import BasicTypes ( RecFlag(..), Fixity(..), FixityDirection(..) + , maxPrecedence, defaultFixity ) -import BasicTypes ( IfaceFlavour(..), RecFlag(..) ) import FieldLabel ( fieldLabelName ) import DataCon ( isNullaryDataCon, dataConTag, dataConRawArgTys, fIRST_TAG, DataCon, ConTag, dataConFieldLabels ) import Name ( getOccString, getOccName, getSrcLoc, occNameString, - modAndOcc, OccName, Name ) + occNameUserString, nameRdrName, varName, + OccName, Name, NamedThing(..), NameSpace, + isDataSymOcc, isSymOcc + ) import PrimOp ( PrimOp(..) ) import PrelInfo -- Lots of RdrNames import SrcLoc ( mkGeneratedSrcLoc, SrcLoc ) import TyCon ( TyCon, isNewTyCon, tyConDataCons, isEnumerationTyCon, - maybeTyConSingleCon + maybeTyConSingleCon, tyConFamilySize ) import Type ( isUnLiftedType, isUnboxedType, Type ) import TysPrim ( charPrimTy, intPrimTy, wordPrimTy, addrPrimTy, floatPrimTy, doublePrimTy ) import Util ( mapAccumL, zipEqual, zipWithEqual, - zipWith3Equal, nOfThem ) + zipWith3Equal, nOfThem, assocDefault ) import Panic ( panic, assertPanic ) import Maybes ( maybeToBool ) +import Constants import List ( partition, intersperse ) +import Char ( isAlpha ) \end{code} %************************************************************************ @@ -171,7 +178,7 @@ gen_Eq_binds tycon case maybeTyConSingleCon tycon of Just _ -> [] Nothing -> -- if cons don't match, then False - [([a_Pat, b_Pat], false_Expr)] + [([wildPat, wildPat], false_Expr)] else -- calc. and compare the tags [([a_Pat, b_Pat], untag_Expr tycon [(a_RDR,ah_RDR), (b_RDR,bh_RDR)] @@ -303,7 +310,8 @@ JJQC-30-Nov-1997 gen_Ord_binds :: TyCon -> RdrNameMonoBinds gen_Ord_binds tycon - = defaulted `AndMonoBinds` compare + = compare -- `AndMonoBinds` compare + -- The default declaration in PrelBase handles this where tycon_loc = getSrcLoc tycon -------------------------------------------------------------------- @@ -384,6 +392,8 @@ gen_Ord_binds tycon -- Tags are equal, no args => return EQ -------------------------------------------------------------------- +{- Not necessary: the default decls in PrelBase handle these + defaulted = foldr1 AndMonoBinds [lt, le, ge, gt, max_, min_] lt = mk_easy_FunMonoBind mkGeneratedSrcLoc lt_RDR [a_Pat, b_Pat] [] ( @@ -399,6 +409,7 @@ max_ = mk_easy_FunMonoBind mkGeneratedSrcLoc max_RDR [a_Pat, b_Pat] [] ( compare_Case b_Expr a_Expr a_Expr a_Expr b_Expr) min_ = mk_easy_FunMonoBind mkGeneratedSrcLoc min_RDR [a_Pat, b_Pat] [] ( compare_Case a_Expr b_Expr b_Expr a_Expr b_Expr) +-} \end{code} %************************************************************************ @@ -417,6 +428,9 @@ we use both @con2tag_Foo@ and @tag2con_Foo@ functions, as well as a \begin{verbatim} instance ... Enum (Foo ...) where + succ x = toEnum (1 + fromEnum x) + pred x = toEnum (fromEnum x - 1) + toEnum i = tag2con_Foo i enumFrom a = map tag2con_Foo [con2tag_Foo a .. maxtag_Foo] @@ -443,16 +457,54 @@ For @enumFromTo@ and @enumFromThenTo@, we use the default methods. gen_Enum_binds :: TyCon -> RdrNameMonoBinds gen_Enum_binds tycon - = to_enum `AndMonoBinds` + = succ_enum `AndMonoBinds` + pred_enum `AndMonoBinds` + to_enum `AndMonoBinds` enum_from `AndMonoBinds` enum_from_then `AndMonoBinds` from_enum where tycon_loc = getSrcLoc tycon + occ_nm = getOccString tycon + + succ_enum + = mk_easy_FunMonoBind tycon_loc succ_RDR [a_Pat] [] $ + untag_Expr tycon [(a_RDR, ah_RDR)] $ + HsIf (HsApp (HsApp (HsVar eq_RDR) + (HsVar (maxtag_RDR tycon))) + (mk_easy_App mkInt_RDR [ah_RDR])) + (illegal_Expr "succ" occ_nm "tried to take `succ' of last tag in enumeration") + (HsApp (HsVar (tag2con_RDR tycon)) + (HsApp (HsApp (HsVar plus_RDR) + (mk_easy_App mkInt_RDR [ah_RDR])) + (HsLit (HsInt 1)))) + tycon_loc + + pred_enum + = mk_easy_FunMonoBind tycon_loc pred_RDR [a_Pat] [] $ + untag_Expr tycon [(a_RDR, ah_RDR)] $ + HsIf (HsApp (HsApp (HsVar eq_RDR) (HsLit (HsInt 0))) + (mk_easy_App mkInt_RDR [ah_RDR])) + (illegal_Expr "pred" occ_nm "tried to take `pred' of first tag in enumeration") + (HsApp (HsVar (tag2con_RDR tycon)) + (HsApp (HsApp (HsVar plus_RDR) + (mk_easy_App mkInt_RDR [ah_RDR])) + (HsLit (HsInt (-1))))) + tycon_loc to_enum = mk_easy_FunMonoBind tycon_loc toEnum_RDR [a_Pat] [] $ - mk_easy_App (tag2con_RDR tycon) [a_RDR] + HsIf (HsApp (HsApp + (HsVar and_RDR) + (HsApp (HsApp (HsVar ge_RDR) + (HsVar a_RDR)) + (HsLit (HsInt 0)))) + (HsApp (HsApp (HsVar le_RDR) + (HsVar a_RDR)) + (HsVar (maxtag_RDR tycon)))) + (mk_easy_App (tag2con_RDR tycon) [a_RDR]) + (illegal_toEnum_tag occ_nm (maxtag_RDR tycon)) + tycon_loc enum_from = mk_easy_FunMonoBind tycon_loc enumFrom_RDR [a_Pat] [] $ @@ -469,7 +521,12 @@ gen_Enum_binds tycon HsPar (enum_from_then_to_Expr (mk_easy_App mkInt_RDR [ah_RDR]) (mk_easy_App mkInt_RDR [bh_RDR]) - (HsVar (maxtag_RDR tycon))) + (HsIf (HsApp (HsApp (HsVar gt_RDR) + (mk_easy_App mkInt_RDR [ah_RDR])) + (mk_easy_App mkInt_RDR [bh_RDR])) + (HsLit (HsInt 0)) + (HsVar (maxtag_RDR tycon)) + tycon_loc)) from_enum = mk_easy_FunMonoBind tycon_loc fromEnum_RDR [a_Pat] [] $ @@ -597,7 +654,7 @@ gen_Ix_binds tycon enum_index = mk_easy_FunMonoBind tycon_loc index_RDR - [AsPatIn c_RDR (TuplePatIn [a_Pat, b_Pat] True{-boxed-}), + [AsPatIn c_RDR (TuplePatIn [a_Pat, wildPat] True{-boxed-}), d_Pat] [] ( HsIf (HsPar (mk_easy_App inRange_RDR [c_RDR, d_RDR])) ( untag_Expr tycon [(a_RDR, ah_RDR)] ( @@ -711,12 +768,10 @@ gen_Ix_binds tycon %* * %************************************************************************ -Ignoring all the infix-ery mumbo jumbo (ToDo) - \begin{code} -gen_Read_binds :: TyCon -> RdrNameMonoBinds +gen_Read_binds :: Fixities -> TyCon -> RdrNameMonoBinds -gen_Read_binds tycon +gen_Read_binds fixities tycon = reads_prec `AndMonoBinds` read_list where tycon_loc = getSrcLoc tycon @@ -729,55 +784,90 @@ gen_Read_binds tycon read_con_comprehensions = map read_con (tyConDataCons tycon) in - mk_easy_FunMonoBind tycon_loc readsPrec_RDR [a_Pat, b_Pat] [] ( + mk_easy_FunMonoBind tycon_loc readsPrec_RDR [zz_a_Pat, b_Pat] [] ( foldr1 append_Expr read_con_comprehensions ) where read_con data_con -- note: "b" is the string being "read" - = let - data_con_RDR = qual_orig_name data_con - data_con_str= occNameString (getOccName data_con) - con_arity = argFieldCount data_con - con_expr = mk_easy_App data_con_RDR as_needed - nullary_con = con_arity == 0 - labels = dataConFieldLabels data_con - lab_fields = length labels - - as_needed = take con_arity as_RDRs - bs_needed - | lab_fields == 0 = take con_arity bs_RDRs - | otherwise = take (4*lab_fields + 1) bs_RDRs - -- (label, '=' and field)*n, (n-1)*',' + '{' + '}' - con_qual - = BindStmt - (TuplePatIn [LitPatIn (mkHsString data_con_str), - d_Pat] True) - (HsApp (HsVar lex_RDR) c_Expr) - tycon_loc - - str_qual str res draw_from - = BindStmt - (TuplePatIn [LitPatIn (mkHsString str), VarPatIn res] True) - (HsApp (HsVar lex_RDR) draw_from) - tycon_loc + = HsApp ( + readParen_Expr read_paren_arg $ HsPar $ + HsLam (mk_easy_Match tycon_loc [c_Pat] [] $ + HsDo ListComp stmts tycon_loc) + ) (HsVar b_RDR) + where + data_con_RDR = qual_orig_name data_con + data_con_str = occNameUserString (getOccName data_con) + con_arity = argFieldCount data_con + con_expr = mk_easy_App data_con_RDR as_needed + nullary_con = con_arity == 0 + labels = dataConFieldLabels data_con + lab_fields = length labels + dc_nm = getName data_con + is_infix = isDataSymOcc (getOccName dc_nm) + + as_needed = take con_arity as_RDRs + bs_needed + | is_infix = take (1 + con_arity) bs_RDRs + | lab_fields == 0 = take con_arity bs_RDRs + | otherwise = take (4*lab_fields + 1) bs_RDRs + -- (label, '=' and field)*n, (n-1)*',' + '{' + '}' + + (as1:as2:_) = as_needed + (bs1:bs2:bs3:_) = bs_needed + + con_qual + | not is_infix = + BindStmt + (TuplePatIn [LitPatIn (mkHsString data_con_str), d_Pat] True) + (HsApp (HsVar lex_RDR) c_Expr) + tycon_loc + | otherwise = + BindStmt + (TuplePatIn [LitPatIn (mkHsString data_con_str), VarPatIn bs2] True) + (HsApp (HsVar lex_RDR) (HsVar bs1)) + tycon_loc + + + str_qual str res draw_from = + BindStmt + (TuplePatIn [LitPatIn (mkHsString str), VarPatIn res] True) + (HsApp (HsVar lex_RDR) draw_from) + tycon_loc + + str_qual_paren str res draw_from = + BindStmt + (TuplePatIn [LitPatIn (mkHsString str), VarPatIn res] True) + (HsApp (readParen_Expr true_Expr (HsVar lex_RDR)) draw_from) + tycon_loc - read_label f - = let nm = occNameString (getOccName (fieldLabelName f)) - in - [str_qual nm, str_qual "="] + read_label f = [rd_lab, str_qual "="] -- There might be spaces between the label and '=' - - field_quals - | lab_fields == 0 = - snd (mapAccumL mk_qual - d_Expr - (zipWithEqual "as_needed" - (\ con_field draw_from -> (mk_read_qual con_field, - draw_from)) - as_needed bs_needed)) - | otherwise = - snd $ - mapAccumL mk_qual d_Expr + where + rd_lab + | is_op = str_qual_paren nm + | otherwise = str_qual nm + + occ_nm = getOccName (fieldLabelName f) + is_op = isSymOcc occ_nm + nm = occNameUserString occ_nm + + field_quals + | is_infix = + snd (mapAccumL mk_qual_infix + c_Expr + [ (mk_read_qual lp as1, bs1, bs2) + , (mk_read_qual rp as2, bs3, bs3) + ]) + | lab_fields == 0 = -- common case. + snd (mapAccumL mk_qual + d_Expr + (zipWithEqual "as_needed" + (\ con_field draw_from -> (mk_read_qual 10 con_field, + draw_from)) + as_needed bs_needed)) + | otherwise = + snd $ + mapAccumL mk_qual d_Expr (zipEqual "bs_needed" ((str_qual "{": concat ( @@ -788,37 +878,45 @@ gen_Read_binds tycon -- The labels (map read_label labels) -- The fields - (map mk_read_qual as_needed))) ++ [str_qual "}"]) + (map (mk_read_qual 10) as_needed))) ++ [str_qual "}"]) bs_needed) - mk_qual draw_from (f, str_left) - = (HsVar str_left, -- what to draw from down the line... - f str_left draw_from) + mk_qual_infix draw_from (f, str_left, str_left2) = + (HsVar str_left2, -- what to draw from down the line... + f str_left draw_from) - mk_read_qual con_field res draw_from = - BindStmt - (TuplePatIn [VarPatIn con_field, VarPatIn res] True) - (HsApp (HsApp (HsVar readsPrec_RDR) (HsLit (HsInt 10))) draw_from) - tycon_loc + mk_qual draw_from (f, str_left) = + (HsVar str_left, -- what to draw from down the line... + f str_left draw_from) - result_expr = ExplicitTuple [con_expr, if null bs_needed - then d_Expr - else HsVar (last bs_needed)] True + mk_read_qual p con_field res draw_from = + BindStmt + (TuplePatIn [VarPatIn con_field, VarPatIn res] True) + (HsApp (HsApp (HsVar readsPrec_RDR) (HsLit (HsInt p))) draw_from) + tycon_loc - stmts = con_qual:field_quals ++ [ReturnStmt result_expr] - - read_paren_arg - = if nullary_con then -- must be False (parens are surely optional) - false_Expr - else -- parens depend on precedence... - HsPar (genOpApp a_Expr gt_RDR (HsLit (HsInt 9))) - in - HsApp ( - readParen_Expr read_paren_arg $ HsPar $ - HsLam (mk_easy_Match tycon_loc [c_Pat] [] $ - HsDo ListComp stmts tycon_loc) - ) (HsVar b_RDR) + result_expr = ExplicitTuple [con_expr, if null bs_needed + then d_Expr + else HsVar (last bs_needed)] True + + [lp,rp] = getLRPrecs is_infix fixities dc_nm + quals + | is_infix = let (h:t) = field_quals in (h:con_qual:t) + | otherwise = con_qual:field_quals + + stmts = quals ++ [ReturnStmt result_expr] + + {- + c.f. Figure 18 in Haskell 1.1 report. + -} + paren_prec_limit + | not is_infix = fromInt maxPrecedence + | otherwise = getFixity fixities dc_nm + + read_paren_arg -- parens depend on precedence... + | nullary_con = false_Expr -- it's optional. + | otherwise = HsPar (genOpApp zz_a_Expr gt_RDR (HsLit (HsInt paren_prec_limit))) \end{code} %************************************************************************ @@ -827,12 +925,10 @@ gen_Read_binds tycon %* * %************************************************************************ -Ignoring all the infix-ery mumbo jumbo (ToDo) - \begin{code} -gen_Show_binds :: TyCon -> RdrNameMonoBinds +gen_Show_binds :: Fixities -> TyCon -> RdrNameMonoBinds -gen_Show_binds tycon +gen_Show_binds fixs_assoc tycon = shows_prec `AndMonoBinds` show_list where tycon_loc = getSrcLoc tycon @@ -840,54 +936,82 @@ gen_Show_binds tycon show_list = mk_easy_FunMonoBind tycon_loc showList_RDR [] [] (HsApp (HsVar showList___RDR) (HsPar (HsApp (HsVar showsPrec_RDR) (HsLit (HsInt 0))))) ----------------------------------------------------------------------- - shows_prec - = mk_FunMonoBind tycon_loc showsPrec_RDR (map pats_etc (tyConDataCons tycon)) + shows_prec = mk_FunMonoBind tycon_loc showsPrec_RDR (map pats_etc (tyConDataCons tycon)) where pats_etc data_con - = let - data_con_RDR = qual_orig_name data_con - con_arity = argFieldCount data_con - bs_needed = take con_arity bs_RDRs - con_pat = ConPatIn data_con_RDR (map VarPatIn bs_needed) - nullary_con = con_arity == 0 - labels = dataConFieldLabels data_con - lab_fields = length labels - - show_con - = let nm = occNameString (getOccName data_con) - space_ocurly_maybe - | nullary_con = "" - | lab_fields == 0 = " " - | otherwise = "{" - - in - mk_showString_app (nm ++ space_ocurly_maybe) - - show_all con fs - = let - ccurly_maybe - | lab_fields > 0 = [mk_showString_app "}"] - | otherwise = [] - in - con:fs ++ ccurly_maybe - - show_thingies = show_all show_con real_show_thingies_with_labs + | nullary_con = -- skip the showParen junk... + ASSERT(null bs_needed) + ([wildPat, con_pat], show_con) + | otherwise = + ([a_Pat, con_pat], + showParen_Expr (HsPar (genOpApp a_Expr ge_RDR (HsLit (HsInt paren_prec_limit)))) + (HsPar (nested_compose_Expr show_thingies))) + where + data_con_RDR = qual_orig_name data_con + con_arity = argFieldCount data_con + bs_needed = take con_arity bs_RDRs + con_pat = ConPatIn data_con_RDR (map VarPatIn bs_needed) + nullary_con = con_arity == 0 + labels = dataConFieldLabels data_con + lab_fields = length labels + + dc_nm = getName data_con + dc_occ_nm = getOccName data_con + dc_occ_nm_str = occNameUserString dc_occ_nm + + is_infix = isDataSymOcc dc_occ_nm + + + show_con + | is_infix = mk_showString_app (' ':dc_occ_nm_str) + | otherwise = mk_showString_app (dc_occ_nm_str ++ space_ocurly_maybe) + where + space_ocurly_maybe + | nullary_con = "" + | lab_fields == 0 = " " + | otherwise = "{" + + + show_all con fs@(x:xs) + | is_infix = x:con:xs + | otherwise = + let + ccurly_maybe + | lab_fields > 0 = [mk_showString_app "}"] + | otherwise = [] + in + con:fs ++ ccurly_maybe + + show_thingies = show_all show_con real_show_thingies_with_labs - show_label l - = let nm = occNameString (getOccName (fieldLabelName l)) - in - mk_showString_app (nm ++ "=") + show_label l = mk_showString_app (the_name ++ "=") + where + occ_nm = getOccName (fieldLabelName l) + -- legal, but rare. + is_op = isSymOcc occ_nm + the_name + | is_op = '(':nm ++ ")" + | otherwise = nm + + nm = occNameUserString occ_nm + + + mk_showString_app str = HsApp (HsVar showString_RDR) + (HsLit (mkHsString str)) - mk_showString_app str = HsApp (HsVar showString_RDR) - (HsLit (mkHsString str)) + prec_cons = getLRPrecs is_infix fixs_assoc dc_nm - real_show_thingies = + real_show_thingies + | is_infix = + [ HsApp (HsApp (HsVar showsPrec_RDR) (HsLit (HsInt p))) (HsVar b) + | (p,b) <- zip prec_cons bs_needed ] + | otherwise = [ HsApp (HsApp (HsVar showsPrec_RDR) (HsLit (HsInt 10))) (HsVar b) | b <- bs_needed ] - real_show_thingies_with_labs - | lab_fields == 0 = intersperse (HsVar showSpace_RDR) real_show_thingies - | otherwise = --Assumption: no of fields == no of labelled fields + real_show_thingies_with_labs + | lab_fields == 0 = intersperse (HsVar showSpace_RDR) real_show_thingies + | otherwise = --Assumption: no of fields == no of labelled fields -- (and in same order) concat $ intersperse ([mk_showString_app ","]) $ -- Using SLIT()s containing ,s spells trouble. @@ -896,17 +1020,63 @@ gen_Show_binds tycon (map show_label labels) real_show_thingies + (con_left_assoc, con_right_assoc) = isLRAssoc fixs_assoc dc_nm + + {- + c.f. Figure 16 and 17 in Haskell 1.1 report + -} + paren_prec_limit + | not is_infix = fromInt maxPrecedence + 1 + | otherwise = getFixity fixs_assoc dc_nm + 1 + +\end{code} + +\begin{code} +getLRPrecs :: Bool -> Fixities -> Name -> [Integer] +getLRPrecs is_infix fixs_assoc nm = [lp, rp] + where + {- + Figuring out the fixities of the arguments to a constructor, + cf. Figures 16-18 in Haskell 1.1 report. + -} + (con_left_assoc, con_right_assoc) = isLRAssoc fixs_assoc nm + paren_con_prec = getFixity fixs_assoc nm + maxPrec = fromInt maxPrecedence + + lp + | not is_infix = maxPrec + 1 + | con_left_assoc = paren_con_prec + | otherwise = paren_con_prec + 1 + + rp + | not is_infix = maxPrec + 1 + | con_right_assoc = paren_con_prec + | otherwise = paren_con_prec + 1 + +getFixity :: Fixities -> Name -> Integer +getFixity fixs_assoc nm = + case lookupFixity fixs_assoc nm of + Fixity x _ -> fromInt x + +isLRAssoc :: Fixities -> Name -> (Bool, Bool) +isLRAssoc fixs_assoc nm = + case lookupFixity fixs_assoc nm of + Fixity _ InfixN -> (False, False) + Fixity _ InfixR -> (False, True) + Fixity _ InfixL -> (True, False) + +lookupFixity :: Fixities -> Name -> Fixity +lookupFixity fixs_assoc nm = assocDefault defaultFixity fixs_assoc nm + +isInfixOccName :: String -> Bool +isInfixOccName str = + case str of + (':':_) -> True + _ -> False - in - if nullary_con then -- skip the showParen junk... - ASSERT(null bs_needed) - ([a_Pat, con_pat], show_con) - else - ([a_Pat, con_pat], - showParen_Expr (HsPar (genOpApp a_Expr ge_RDR (HsLit (HsInt 10)))) - (HsPar (nested_compose_Expr show_thingies))) \end{code} + %************************************************************************ %* * \subsection{Generating extra binds (@con2tag@ and @tag2con@)} @@ -935,10 +1105,17 @@ gen_tag_n_con_monobind -> RdrNameMonoBinds gen_tag_n_con_monobind (rdr_name, tycon, GenCon2Tag) + | lots_of_constructors + = mk_FunMonoBind (getSrcLoc tycon) rdr_name + [([VarPatIn a_RDR], HsApp getTag_Expr a_Expr)] + + | otherwise = mk_FunMonoBind (getSrcLoc tycon) rdr_name (map mk_stuff (tyConDataCons tycon)) + where - mk_stuff :: DataCon -> ([RdrNamePat], RdrNameHsExpr) + lots_of_constructors = tyConFamilySize tycon > mAX_FAMILY_SIZE_FOR_VEC_RETURNS + mk_stuff :: DataCon -> ([RdrNamePat], RdrNameHsExpr) mk_stuff var = ([pat], HsLit (HsIntPrim (toInteger ((dataConTag var) - fIRST_TAG)))) where @@ -946,14 +1123,10 @@ gen_tag_n_con_monobind (rdr_name, tycon, GenCon2Tag) var_RDR = qual_orig_name var gen_tag_n_con_monobind (rdr_name, tycon, GenTag2Con) - = mk_FunMonoBind (getSrcLoc tycon) rdr_name (map mk_stuff (tyConDataCons tycon) ++ - [([WildPatIn], impossible_Expr)]) - where - mk_stuff :: DataCon -> ([RdrNamePat], RdrNameHsExpr) - mk_stuff var = ([lit_pat], HsVar var_RDR) - where - lit_pat = ConPatIn mkInt_RDR [LitPatIn (HsIntPrim (toInteger ((dataConTag var) - fIRST_TAG)))] - var_RDR = qual_orig_name var + = mk_FunMonoBind (getSrcLoc tycon) rdr_name + [([ConPatIn mkInt_RDR [VarPatIn a_RDR]], + ExprWithTySig (HsApp tagToEnum_Expr a_Expr) + (MonoTyVar (qual_orig_name tycon)))] gen_tag_n_con_monobind (rdr_name, tycon, GenMaxTag) = mk_easy_FunMonoBind (getSrcLoc tycon) @@ -1157,6 +1330,30 @@ nested_compose_Expr (e:es) -- We generate these to keep the desugarer from complaining that they *might* happen! impossible_Expr = HsApp (HsVar error_RDR) (HsLit (HsString (_PK_ "Urk! in TcGenDeriv"))) +-- illegal_Expr is used when signalling error conditions in the RHS of a derived +-- method. It is currently only used by Enum.{succ,pred} +illegal_Expr meth tp msg = + HsApp (HsVar error_RDR) (HsLit (HsString (_PK_ (meth ++ '{':tp ++ "}: " ++ msg)))) + +-- illegal_toEnum_tag is an extended version of illegal_Expr, which also allows you +-- to include the value of a_RDR in the error string. +illegal_toEnum_tag tp maxtag = + HsApp (HsVar error_RDR) + (HsApp (HsApp (HsVar append_RDR) + (HsLit (HsString (_PK_ ("toEnum{" ++ tp ++ "}: tag ("))))) + (HsApp (HsApp (HsApp + (HsVar showsPrec_RDR) + (HsLit (HsInt 0))) + (HsVar a_RDR)) + (HsApp (HsApp + (HsVar append_RDR) + (HsLit (HsString (_PK_ ") is outside of enumeration's range (0,")))) + (HsApp (HsApp (HsApp + (HsVar showsPrec_RDR) + (HsLit (HsInt 0))) + (HsVar maxtag)) + (HsLit (HsString (_PK_ ")"))))))) + parenify e@(HsVar _) = e parenify e = HsPar e @@ -1169,8 +1366,10 @@ genOpApp e1 op e2 = mkOpApp e1 op e2 \end{code} \begin{code} -qual_orig_name n = case modAndOcc n of { (m,n) -> Qual m n HiFile } +qual_orig_name n = nameRdrName (getName n) +varUnqual n = mkSrcUnqual varName n +zz_a_RDR = varUnqual SLIT("_a") a_RDR = varUnqual SLIT("a") b_RDR = varUnqual SLIT("b") c_RDR = varUnqual SLIT("c") @@ -1188,6 +1387,7 @@ cs_RDRs = [ varUnqual (_PK_ ("c"++show i)) | i <- [(1::Int) .. ] ] mkHsString s = HsString (_PK_ s) +zz_a_Expr = HsVar zz_a_RDR a_Expr = HsVar a_RDR b_Expr = HsVar b_RDR c_Expr = HsVar c_RDR @@ -1198,8 +1398,12 @@ gtTag_Expr = HsVar gtTag_RDR false_Expr = HsVar false_RDR true_Expr = HsVar true_RDR +getTag_Expr = HsVar getTag_RDR +tagToEnum_Expr = HsVar tagToEnumH_RDR con2tag_Expr tycon = HsVar (con2tag_RDR tycon) +wildPat = WildPatIn +zz_a_Pat = VarPatIn zz_a_RDR a_Pat = VarPatIn a_RDR b_Pat = VarPatIn b_RDR c_Pat = VarPatIn c_RDR