X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnSource.lhs;h=b3c0e8f7ff9c40becf8843b54a50d633b1426827;hb=da162afcfc9db8335834bb279217c4707fb67988;hp=277862f3bf0e4da3390dcea8318692d494b9cea0;hpb=573ef10b2afd99d3c6a36370a9367609716c97d2;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnSource.lhs b/ghc/compiler/rename/RnSource.lhs index 277862f..b3c0e8f 100644 --- a/ghc/compiler/rename/RnSource.lhs +++ b/ghc/compiler/rename/RnSource.lhs @@ -1,337 +1,267 @@ % -% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996 +% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998 % \section[RnSource]{Main pass of renamer} \begin{code} -#include "HsVersions.h" - -module RnSource ( rnSource, rnTyDecl, rnClassDecl, rnInstDecl, rnPolyType ) where +module RnSource ( rnDecl, rnTyClDecl, rnIfaceRuleDecl, rnInstDecl, rnSourceDecls, + rnHsType, rnHsSigType, rnHsTypeFVs, rnHsSigTypeFVs + ) where -IMP_Ubiq() -IMPORT_DELOOPER(RnLoop) -- *check* the RnPass/RnExpr/RnBinds loop-breaking -IMPORT_1_3(List(partition)) +#include "HsVersions.h" +import RnExpr import HsSyn -import HsPragmas -import RdrHsSyn +import HsTypes ( hsTyVarNames, pprHsContext ) +import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, mkRdrNameWkr, elemRdrEnv ) +import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl, RdrNameTyClDecl, + extractRuleBndrsTyVars, extractHsTyRdrTyVars, + extractHsCtxtRdrTyVars, extractGenericPatTyVars + ) import RnHsSyn +import HsCore + +import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, renameSigsFVs ) +import RnEnv ( lookupTopBndrRn, lookupOccRn, newIPName, + lookupOrigNames, lookupSysBinder, newLocalsRn, + bindLocalsFVRn, bindUVarRn, + bindTyVarsRn, bindTyVars2Rn, + bindTyVarsFV2Rn, extendTyVarEnvFVRn, + bindCoreLocalRn, bindCoreLocalsRn, bindLocalNames, + checkDupOrQualNames, checkDupNames, mapFvRn + ) import RnMonad -import RnBinds ( rnTopBinds, rnMethodBinds ) -import RnUtils ( getLocalsFromRnEnv, lookupGlobalRnEnv, lubExportFlag ) - -import Bag ( emptyBag, unitBag, consBag, unionManyBags, unionBags, listToBag, bagToList ) -import Class ( derivableClassKeys ) -import CmdLineOpts ( opt_CompilingGhcInternals ) -import ErrUtils ( addErrLoc, addShortErrLocLine, addShortWarnLocLine ) -import FiniteMap ( emptyFM, lookupFM, addListToFM_C ) -import Id ( isDataCon, GenId{-instance NamedThing-} ) -import ListSetOps ( unionLists, minusList ) -import Maybes ( maybeToBool, catMaybes ) -import Name ( isLocallyDefined, isLexVarId, getLocalName, ExportFlag(..), - nameImportFlag, RdrName, pprNonSym, Name ) -import Outputable -- ToDo:rm -import PprStyle -- ToDo:rm -import Pretty + +import Class ( FunDep, DefMeth (..) ) +import Name ( Name, OccName, nameOccName, NamedThing(..) ) +import NameSet +import PrelInfo ( derivableClassKeys, cCallishClassKeys ) +import PrelNames ( deRefStablePtr_RDR, makeStablePtr_RDR, + bindIO_RDR, returnIO_RDR + ) +import List ( partition, nub ) +import Outputable import SrcLoc ( SrcLoc ) -import TyCon ( tyConDataCons, TyCon{-instance NamedThing-} ) -import Unique ( Unique ) -import UniqFM ( emptyUFM, addListToUFM_C, listToUFM, plusUFM, lookupUFM, eltsUFM ) -import UniqSet ( SYN_IE(UniqSet) ) -import Util ( isIn, isn'tIn, thenCmp, sortLt, removeDups, mapAndUnzip3, cmpPString, - panic, assertPanic, pprTrace{-ToDo:rm-} ) +import CmdLineOpts ( DynFlag(..) ) + -- Warn of unused for-all'd tyvars +import Unique ( Uniquable(..) ) +import ErrUtils ( Message ) +import CStrings ( isCLabelString ) +import ListSetOps ( removeDupsEq ) \end{code} -rnSource `renames' the source module and export list. +@rnDecl@ `renames' declarations. It simultaneously performs dependency analysis and precedence parsing. It also does the following error checks: \begin{enumerate} \item Checks that tyvars are used properly. This includes checking for undefined tyvars, and tyvars in contexts that are ambiguous. +(Some of this checking has now been moved to module @TcMonoType@, +since we don't have functional dependency information at this point.) \item Checks that all variable occurences are defined. \item -Checks the (..) etc constraints in the export list. +Checks the @(..)@ etc constraints in the export list. \end{enumerate} +%********************************************************* +%* * +\subsection{Value declarations} +%* * +%********************************************************* + \begin{code} -rnSource :: [Module] -- imported modules - -> Bag (Module,RnName) -- unqualified imports from module - -> Bag RenamedFixityDecl -- fixity info for imported names - -> RdrNameHsModule - -> RnM s (RenamedHsModule, - Name -> ExportFlag, -- export info - ([(Name, ExportFlag)], -- export module X stuff - [(Name, ExportFlag)]), - Bag (RnName, RdrName)) -- occurrence info - -rnSource imp_mods unqual_imps imp_fixes - (HsModule mod version exports _ fixes - ty_decls specdata_sigs class_decls - inst_decls specinst_sigs defaults - binds _ src_loc) +rnSourceDecls :: [RdrNameHsDecl] -> RnMS ([RenamedHsDecl], FreeVars) + -- The decls get reversed, but that's ok - = pushSrcLocRn src_loc $ +rnSourceDecls decls + = go emptyFVs [] decls + where + -- Fixity and deprecations have been dealt with already; ignore them + go fvs ds' [] = returnRn (ds', fvs) + go fvs ds' (FixD _:ds) = go fvs ds' ds + go fvs ds' (DeprecD _:ds) = go fvs ds' ds + go fvs ds' (d:ds) = rnDecl d `thenRn` \(d', fvs') -> + go (fvs `plusFV` fvs') (d':ds') ds +\end{code} - rnExports (mod:imp_mods) unqual_imps exports `thenRn` \ (exported_fn, module_dotdots) -> - rnFixes fixes `thenRn` \ src_fixes -> - let - all_fixes = src_fixes ++ bagToList imp_fixes - all_fixes_fm = listToUFM (map pair_name all_fixes) - pair_name inf = (fixDeclName inf, inf) - in - setExtraRn all_fixes_fm $ - - mapRn rnTyDecl ty_decls `thenRn` \ new_ty_decls -> - mapRn rnSpecDataSig specdata_sigs `thenRn` \ new_specdata_sigs -> - mapRn rnClassDecl class_decls `thenRn` \ new_class_decls -> - mapRn rnInstDecl inst_decls `thenRn` \ new_inst_decls -> - mapRn rnSpecInstSig specinst_sigs `thenRn` \ new_specinst_sigs -> - rnDefaultDecl defaults `thenRn` \ new_defaults -> - rnTopBinds binds `thenRn` \ new_binds -> - - getOccurrenceUpRn `thenRn` \ occ_info -> - - returnRn ( - HsModule mod version - trashed_exports trashed_imports all_fixes - new_ty_decls new_specdata_sigs new_class_decls - new_inst_decls new_specinst_sigs new_defaults - new_binds [] src_loc, - exported_fn, module_dotdots, - occ_info - ) +%********************************************************* +%* * +\subsection{Value declarations} +%* * +%********************************************************* + +\begin{code} +-- rnDecl does all the work +rnDecl :: RdrNameHsDecl -> RnMS (RenamedHsDecl, FreeVars) + +rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) -> + returnRn (ValD new_binds, fvs) + +rnDecl (TyClD tycl_decl) + = rnTyClDecl tycl_decl `thenRn` \ new_decl -> + rnClassBinds tycl_decl new_decl `thenRn` \ (new_decl', fvs) -> + returnRn (TyClD new_decl', fvs `plusFV` tyClDeclFVs new_decl') + +rnDecl (InstD inst) + = rnInstDecl inst `thenRn` \ new_inst -> + rnInstBinds inst new_inst `thenRn` \ (new_inst', fvs) -> + returnRn (InstD new_inst', fvs `plusFV` instDeclFVs new_inst') + +rnDecl (RuleD rule) + | isIfaceRuleDecl rule + = rnIfaceRuleDecl rule `thenRn` \ new_rule -> + returnRn (RuleD new_rule, ruleDeclFVs new_rule) + | otherwise + = rnHsRuleDecl rule `thenRn` \ (new_rule, fvs) -> + returnRn (RuleD new_rule, fvs) + +rnDecl (DefD (DefaultDecl tys src_loc)) + = pushSrcLocRn src_loc $ + mapFvRn (rnHsTypeFVs doc_str) tys `thenRn` \ (tys', fvs) -> + returnRn (DefD (DefaultDecl tys' src_loc), fvs) where - trashed_exports = {-trace "rnSource:trashed_exports"-} Nothing - trashed_imports = {-trace "rnSource:trashed_imports"-} [] + doc_str = text "a `default' declaration" + +rnDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc)) + = pushSrcLocRn src_loc $ + lookupOccRn name `thenRn` \ name' -> + let + extra_fvs FoExport + | isDyn = lookupOrigNames [makeStablePtr_RDR, deRefStablePtr_RDR, + bindIO_RDR, returnIO_RDR] + | otherwise = + lookupOrigNames [bindIO_RDR, returnIO_RDR] `thenRn` \ fvs -> + returnRn (addOneFV fvs name') + extra_fvs other = returnRn emptyFVs + in + checkRn (ok_ext_nm ext_nm) (badExtName ext_nm) `thenRn_` + + extra_fvs imp_exp `thenRn` \ fvs1 -> + + rnHsTypeFVs fo_decl_msg ty `thenRn` \ (ty', fvs2) -> + returnRn (ForD (ForeignDecl name' imp_exp ty' ext_nm cconv src_loc), + fvs1 `plusFV` fvs2) + where + fo_decl_msg = ptext SLIT("The foreign declaration for") <+> ppr name + isDyn = isDynamicExtName ext_nm + + ok_ext_nm Dynamic = True + ok_ext_nm (ExtName nm (Just mb)) = isCLabelString nm && isCLabelString mb + ok_ext_nm (ExtName nm Nothing) = isCLabelString nm \end{code} %********************************************************* %* * -\subsection{Export list} +\subsection{Instance declarations} %* * %********************************************************* \begin{code} -rnExports :: [Module] - -> Bag (Module,RnName) - -> Maybe [RdrNameIE] - -> RnM s (Name -> ExportFlag, -- main export-flag fun - ([(Name,ExportFlag)], -- info about "module X" exports - [(Name,ExportFlag)]) - ) - -rnExports mods unqual_imps Nothing - = returnRn (\n -> if isLocallyDefined n then ExportAll else NotExported - , ([], []) - ) - -rnExports mods unqual_imps (Just exps) - = getModuleRn `thenRn` \ this_mod -> - getRnEnv `thenRn` \ rn_env -> - mapAndUnzipRn (rnIE mods) exps `thenRn` \ (mod_maybes, exp_bags) -> +rnInstDecl (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc) + = pushSrcLocRn src_loc $ + rnHsSigType (text "an instance decl") inst_ty `thenRn` \ inst_ty' -> + + (case maybe_dfun_rdr_name of + Nothing -> returnRn Nothing + Just dfun_rdr_name -> lookupSysBinder dfun_rdr_name `thenRn` \ dfun_name -> + returnRn (Just dfun_name) + ) `thenRn` \ maybe_dfun_name -> + + -- The typechecker checks that all the bindings are for the right class. + returnRn (InstDecl inst_ty' EmptyMonoBinds [] maybe_dfun_name src_loc) + +-- Compare rnClassBinds +rnInstBinds (InstDecl _ mbinds uprags _ _ ) + (InstDecl inst_ty _ _ maybe_dfun_rdr_name src_loc) + = let + meth_doc = text "the bindings in an instance declaration" + meth_names = collectLocatedMonoBinders mbinds + inst_tyvars = case inst_ty of + HsForAllTy (Just inst_tyvars) _ _ -> inst_tyvars + other -> [] + -- (Slightly strangely) the forall-d tyvars scope over + -- the method bindings too + in + + -- Rename the bindings + -- NB meth_names can be qualified! + checkDupNames meth_doc meth_names `thenRn_` + extendTyVarEnvFVRn (map hsTyVarName inst_tyvars) ( + rnMethodBinds [] mbinds + ) `thenRn` \ (mbinds', meth_fvs) -> let - (tc_bags, val_bags) = unzip exp_bags - tc_names = bagToList (unionManyBags tc_bags) - val_names = bagToList (unionManyBags val_bags) - exp_mods = catMaybes mod_maybes - - -- Warn for duplicate names and modules - (_, dup_tc_names) = removeDups cmp_fst tc_names - (_, dup_val_names) = removeDups cmp_fst val_names - cmp_fst (x,_) (y,_) = x `cmp` y - - (uniq_mods, dup_mods) = removeDups cmpPString exp_mods - (expmods_this, expmods_imps) = partition (== this_mod) uniq_mods - - -- Get names for "module This_Mod" export - (this_tcs, this_vals) - = if null expmods_this - then ([], []) - else getLocalsFromRnEnv rn_env - - -- Get names for exported imported modules - (mod_tcs, mod_vals, empty_mods) - = case mapAndUnzip3 get_mod_names expmods_imps of - (tcs, vals, emptys) -> (concat tcs, concat vals, catMaybes emptys) - - (unqual_tcs, unqual_vals) = partition (isRnTyConOrClass.snd) (bagToList unqual_imps) - - get_mod_names mod - = --pprTrace "get_mod_names" (ppAboves [ppPStr mod, interpp'SP PprDebug (map fst tcs), interpp'SP PprDebug (map fst vals)]) $ - (tcs, vals, empty_mod) - where - tcs = [(getName rn, nameImportFlag (getName rn)) - | (mod',rn) <- unqual_tcs, mod == mod'] - vals = [(getName rn, nameImportFlag (getName rn)) - | (mod',rn) <- unqual_vals, mod == mod', fun_looking rn] - empty_mod = if null tcs && null vals - then Just mod - else Nothing - - -- fun_looking: must avoid class ops and data constructors - -- and record fieldnames - fun_looking (RnName _) = True - fun_looking (WiredInId i) = not (isDataCon i) - fun_looking _ = False - - -- Build finite map of exported names to export flag - tc_map0 = addListToUFM_C lub_expflag emptyUFM (map pair_fst tc_names) - tc_map1 = addListToUFM_C lub_expflag tc_map0 (map pair_fst mod_tcs) - tc_map = addListToUFM_C lub_expflag tc_map1 (map (pair_fst.exp_all) this_tcs) - - val_map0 = addListToUFM_C lub_expflag emptyUFM (map pair_fst val_names) - val_map1 = addListToUFM_C lub_expflag val_map0 (map pair_fst mod_vals) - val_map = addListToUFM_C lub_expflag val_map1 (map (pair_fst.exp_all) this_vals) - - pair_fst pr@(n,_) = (n,pr) - exp_all rn = (getName rn, ExportAll) - lub_expflag (n, flag1) (_, flag2) = (n, lubExportFlag flag1 flag2) - - -- Check for exporting of duplicate local names - tc_locals = [(getLocalName n, n) | (n,_) <- eltsUFM tc_map] - val_locals = [(getLocalName n, n) | (n,_) <- eltsUFM val_map] - (_, dup_tc_locals) = removeDups cmp_local tc_locals - (_, dup_val_locals) = removeDups cmp_local val_locals - cmp_local (x,_) (y,_) = x `cmpPString` y - - -- Build export flag function - final_exp_map = plusUFM tc_map val_map - exp_fn n = case lookupUFM final_exp_map n of - Nothing -> NotExported - Just (_,flag) -> flag + binders = collectMonoBinders mbinds' + binder_set = mkNameSet binders in - getSrcLocRn `thenRn` \ src_loc -> - mapRn (addWarnRn . dupNameExportWarn src_loc) dup_tc_names `thenRn_` - mapRn (addWarnRn . dupNameExportWarn src_loc) dup_val_names `thenRn_` - mapRn (addWarnRn . dupModExportWarn src_loc) dup_mods `thenRn_` - mapRn (addWarnRn . emptyModExportWarn src_loc) empty_mods `thenRn_` - mapRn (addErrRn . dupLocalsExportErr src_loc) dup_tc_locals `thenRn_` - mapRn (addErrRn . dupLocalsExportErr src_loc) dup_val_locals `thenRn_` - returnRn (exp_fn, (mod_vals, mod_tcs)) - ------------------------------------- --- rename an "IE" in the export list - -rnIE :: [Module] -- this module and all the (directly?) imported modules - -> RdrNameIE - -> RnM s ( - Maybe Module, -- Just m => a "module X" export item - (Bag (Name, ExportFlag), -- Exported tycons/classes - Bag (Name, ExportFlag))) -- Exported values - -rnIE mods (IEVar name) - = lookupValue name `thenRn` \ rn -> - checkIEVar rn `thenRn` \ exps -> - returnRn (Nothing, exps) - where - checkIEVar (RnName n) = returnRn (emptyBag, unitBag (n,ExportAll)) - checkIEVar (WiredInId i) = returnRn (emptyBag, unitBag (getName i, ExportAll)) - checkIEVar rn@(RnClassOp _ _) = getSrcLocRn `thenRn` \ src_loc -> - failButContinueRn (emptyBag, emptyBag) (classOpExportErr rn src_loc) - checkIEVar rn@(RnField _ _) = getSrcLocRn `thenRn` \ src_loc -> - failButContinueRn (emptyBag, emptyBag) (fieldExportErr rn src_loc) - checkIEVar rn = --pprTrace "rnIE:IEVar:panic? ToDo?:" (ppr PprDebug rn) $ - returnRn (emptyBag, emptyBag) - -rnIE mods (IEThingAbs name) - = lookupTyConOrClass name `thenRn` \ rn -> - checkIEAbs rn `thenRn` \ exps -> - returnRn (Nothing, exps) - where - checkIEAbs (RnSyn n) = returnRn (unitBag (n,ExportAbs), emptyBag) - checkIEAbs (RnData n _ _) = returnRn (unitBag (n,ExportAbs), emptyBag) - checkIEAbs (RnClass n _) = returnRn (unitBag (n,ExportAbs), emptyBag) - checkIEAbs (WiredInTyCon t) = returnRn (unitBag (getName t,ExportAbs), emptyBag) - checkIEAbs rn = --pprTrace "rnIE:IEAbs:panic? ToDo?:" (ppr PprDebug rn) $ - returnRn (emptyBag, emptyBag) - -rnIE mods (IEThingAll name) - = lookupTyConOrClass name `thenRn` \ rn -> - checkIEAll rn `thenRn` \ exps -> - checkImportAll rn `thenRn_` - returnRn (Nothing, exps) - where - checkIEAll (RnData n cons fields) - = returnRn (unitBag (exp_all n), - listToBag (map exp_all cons) `unionBags` listToBag (map exp_all fields)) - - checkIEAll (WiredInTyCon t) - = returnRn (unitBag (exp_all (getName t)), listToBag (map exp_all cons)) - where - cons = map getName (tyConDataCons t) - - checkIEAll (RnClass n ops) - = returnRn (unitBag (exp_all n), listToBag (map exp_all ops)) - checkIEAll rn@(RnSyn n) - = getSrcLocRn `thenRn` \ src_loc -> - warnAndContinueRn (unitBag (n, ExportAbs), emptyBag) - (synAllExportErr False{-warning-} rn src_loc) - - checkIEAll rn = --pprTrace "rnIE:IEAll:panic? ToDo?:" (ppr PprDebug rn) $ - returnRn (emptyBag, emptyBag) - - exp_all n = (n, ExportAll) - -rnIE mods (IEThingWith name names) - = lookupTyConOrClass name `thenRn` \ rn -> - mapRn lookupValue names `thenRn` \ rns -> - checkIEWith rn rns `thenRn` \ exps -> - checkImportAll rn `thenRn_` - returnRn (Nothing, exps) - where - checkIEWith rn@(RnData n cons fields) rns - | same_names (cons++fields) rns - = returnRn (unitBag (exp_all n), listToBag (map exp_all cons) - `unionBags` - listToBag (map exp_all fields)) - | otherwise - = rnWithErr "constructors (and fields)" rn (cons++fields) rns - checkIEWith rn@(RnClass n ops) rns - | same_names ops rns - = returnRn (unitBag (exp_all n), listToBag (map exp_all ops)) - | otherwise - = rnWithErr "class ops" rn ops rns - checkIEWith rn@(RnSyn _) rns - = getSrcLocRn `thenRn` \ src_loc -> - failButContinueRn (emptyBag, emptyBag) (synAllExportErr True{-error-} rn src_loc) - checkIEWith (WiredInTyCon _) rns = panic "RnSource.rnIE:checkIEWith:WiredInTyCon:ToDo (boring)" - checkIEWith rn rns - = pprTrace "rnIE:IEWith:panic? ToDo?:" (ppr PprDebug rn) $ - returnRn (emptyBag, emptyBag) - - exp_all n = (n, ExportAll) - - same_names has rns - = all (not.isRnUnbound) rns && - sortLt (<) (map uniqueOf has) == sortLt (<) (map uniqueOf rns) - - rnWithErr str rn has rns - = getSrcLocRn `thenRn` \ src_loc -> - failButContinueRn (emptyBag, emptyBag) (withExportErr str rn has rns src_loc) - -rnIE mods (IEModuleContents mod) - | isIn "rnIE:IEModule" mod mods - = returnRn (Just mod, (emptyBag, emptyBag)) - | otherwise - = getSrcLocRn `thenRn` \ src_loc -> - failButContinueRn (Nothing, (emptyBag, emptyBag)) (badModExportErr mod src_loc) + -- Rename the prags and signatures. + -- Note that the type variables are not in scope here, + -- so that instance Eq a => Eq (T a) where + -- {-# SPECIALISE instance Eq a => Eq (T [a]) #-} + -- works OK. + -- + -- But the (unqualified) method names are in scope + bindLocalNames binders ( + renameSigsFVs (okInstDclSig binder_set) uprags + ) `thenRn` \ (uprags', prag_fvs) -> + + returnRn (InstDecl inst_ty mbinds' uprags' maybe_dfun_rdr_name src_loc, + meth_fvs `plusFV` prag_fvs) +\end{code} +%********************************************************* +%* * +\subsection{Rules} +%* * +%********************************************************* -checkImportAll rn - = case nameImportFlag (getName rn) of - ExportAll -> returnRn () - exp -> getSrcLocRn `thenRn` \ src_loc -> - addErrRn (importAllErr rn src_loc) +\begin{code} +rnIfaceRuleDecl (IfaceRule rule_name vars fn args rhs src_loc) + = pushSrcLocRn src_loc $ + lookupOccRn fn `thenRn` \ fn' -> + rnCoreBndrs vars $ \ vars' -> + mapRn rnCoreExpr args `thenRn` \ args' -> + rnCoreExpr rhs `thenRn` \ rhs' -> + returnRn (IfaceRule rule_name vars' fn' args' rhs' src_loc) + +rnHsRuleDecl (HsRule rule_name tvs vars lhs rhs src_loc) + = ASSERT( null tvs ) + pushSrcLocRn src_loc $ + + bindTyVarsFV2Rn doc (map UserTyVar sig_tvs) $ \ sig_tvs' _ -> + bindLocalsFVRn doc (map get_var vars) $ \ ids -> + mapFvRn rn_var (vars `zip` ids) `thenRn` \ (vars', fv_vars) -> + + rnExpr lhs `thenRn` \ (lhs', fv_lhs) -> + rnExpr rhs `thenRn` \ (rhs', fv_rhs) -> + checkRn (validRuleLhs ids lhs') + (badRuleLhsErr rule_name lhs') `thenRn_` + let + bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)] + in + mapRn (addErrRn . badRuleVar rule_name) bad_vars `thenRn_` + returnRn (HsRule rule_name sig_tvs' vars' lhs' rhs' src_loc, + fv_vars `plusFV` fv_lhs `plusFV` fv_rhs) + where + doc = text "the transformation rule" <+> ptext rule_name + sig_tvs = extractRuleBndrsTyVars vars + + get_var (RuleBndr v) = v + get_var (RuleBndrSig v _) = v + + rn_var (RuleBndr v, id) = returnRn (RuleBndr id, emptyFVs) + rn_var (RuleBndrSig v t, id) = rnHsTypeFVs doc t `thenRn` \ (t', fvs) -> + returnRn (RuleBndrSig id t', fvs) \end{code} + %********************************************************* %* * -\subsection{Type declarations} +\subsection{Type, class and iface sig declarations} %* * %********************************************************* @@ -341,503 +271,654 @@ names, reporting any unknown names. Renaming type variables is a pain. Because they now contain uniques, it is necessary to pass in an association list which maps a parsed -tyvar to its Name representation. In some cases (type signatures of -values), it is even necessary to go over the type first in order to -get the set of tyvars used by it, make an assoc list, and then go over -it again to rename the tyvars! However, we can also do some scoping -checks at the same time. +tyvar to its @Name@ representation. +In some cases (type signatures of values), +it is even necessary to go over the type first +in order to get the set of tyvars used by it, make an assoc list, +and then go over it again to rename the tyvars! +However, we can also do some scoping checks at the same time. \begin{code} -rnTyDecl :: RdrNameTyDecl -> RnM_Fixes s RenamedTyDecl +rnTyClDecl (IfaceSig name ty id_infos loc) + = pushSrcLocRn loc $ + lookupTopBndrRn name `thenRn` \ name' -> + rnHsType doc_str ty `thenRn` \ ty' -> + mapRn rnIdInfo id_infos `thenRn` \ id_infos' -> + returnRn (IfaceSig name' ty' id_infos' loc) + where + doc_str = text "the interface signature for" <+> quotes (ppr name) -rnTyDecl (TyData context tycon tyvars condecls derivings pragmas src_loc) - = pushSrcLocRn src_loc $ - lookupTyCon tycon `thenRn` \ tycon' -> - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env, tyvars') -> - rnContext tv_env src_loc context `thenRn` \ context' -> - rnConDecls tv_env condecls `thenRn` \ condecls' -> - rn_derivs tycon' src_loc derivings `thenRn` \ derivings' -> - ASSERT(isNoDataPragmas pragmas) - returnRn (TyData context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc) - -rnTyDecl (TyNew context tycon tyvars condecl derivings pragmas src_loc) +rnTyClDecl (TyData new_or_data context tycon tyvars condecls nconstrs derivings src_loc gen_name1 gen_name2) = pushSrcLocRn src_loc $ - lookupTyCon tycon `thenRn` \ tycon' -> - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env, tyvars') -> - rnContext tv_env src_loc context `thenRn` \ context' -> - rnConDecls tv_env condecl `thenRn` \ condecl' -> - rn_derivs tycon' src_loc derivings `thenRn` \ derivings' -> - ASSERT(isNoDataPragmas pragmas) - returnRn (TyNew context' tycon' tyvars' condecl' derivings' noDataPragmas src_loc) - -rnTyDecl (TySynonym name tyvars ty src_loc) + lookupTopBndrRn tycon `thenRn` \ tycon' -> + bindTyVarsRn data_doc tyvars $ \ tyvars' -> + rnContext data_doc context `thenRn` \ context' -> + checkDupOrQualNames data_doc con_names `thenRn_` + mapRn rnConDecl condecls `thenRn` \ condecls' -> + lookupSysBinder gen_name1 `thenRn` \ name1' -> + lookupSysBinder gen_name2 `thenRn` \ name2' -> + rnDerivs derivings `thenRn` \ derivings' -> + returnRn (TyData new_or_data context' tycon' tyvars' condecls' nconstrs + derivings' src_loc name1' name2') + where + data_doc = text "the data type declaration for" <+> quotes (ppr tycon) + con_names = map conDeclName condecls + +rnTyClDecl (TySynonym name tyvars ty src_loc) = pushSrcLocRn src_loc $ - lookupTyCon name `thenRn` \ name' -> - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env, tyvars') -> - rnMonoType tv_env ty `thenRn` \ ty' -> + doptRn Opt_GlasgowExts `thenRn` \ glaExts -> + lookupTopBndrRn name `thenRn` \ name' -> + bindTyVarsRn syn_doc tyvars $ \ tyvars' -> + rnHsType syn_doc (unquantify glaExts ty) `thenRn` \ ty' -> returnRn (TySynonym name' tyvars' ty' src_loc) + where + syn_doc = text "the declaration for type synonym" <+> quotes (ppr name) -rn_derivs tycon2 locn Nothing -- derivs not specified - = returnRn Nothing + -- For H98 we do *not* universally quantify on the RHS of a synonym + -- Silently discard context... but the tyvars in the rest won't be in scope + unquantify glaExts (HsForAllTy Nothing ctxt ty) | glaExts = ty + unquantify glaExys ty = ty -rn_derivs tycon2 locn (Just ds) - = mapRn (rn_deriv tycon2 locn) ds `thenRn` \ derivs -> - returnRn (Just derivs) - where - rn_deriv tycon2 locn clas - = lookupClass clas `thenRn` \ clas_name -> - addErrIfRn (uniqueOf clas_name `not_elem` derivableClassKeys) - (derivingNonStdClassErr clas_name locn) - `thenRn_` - returnRn clas_name - where - not_elem = isn'tIn "rn_deriv" -\end{code} +rnTyClDecl (ClassDecl context cname tyvars fds sigs mbinds names src_loc) + = pushSrcLocRn src_loc $ -@rnConDecls@ uses the `global name function' to create a new -constructor in which local names have been replaced by their original -names, reporting any unknown names. + lookupTopBndrRn cname `thenRn` \ cname' -> -\begin{code} -rnConDecls :: TyVarNamesEnv - -> [RdrNameConDecl] - -> RnM_Fixes s [RenamedConDecl] + -- Deal with the implicit tycon and datacon name + -- They aren't in scope (because they aren't visible to the user) + -- and what we want to do is simply look them up in the cache; + -- we jolly well ought to get a 'hit' there! + mapRn lookupSysBinder names `thenRn` \ names' -> -rnConDecls tv_env con_decls - = mapRn rn_decl con_decls - where - rn_decl (ConDecl name tys src_loc) - = pushSrcLocRn src_loc $ - lookupConstr name `thenRn` \ new_name -> - mapRn rn_bang_ty tys `thenRn` \ new_tys -> - returnRn (ConDecl new_name new_tys src_loc) - - rn_decl (ConOpDecl ty1 op ty2 src_loc) - = pushSrcLocRn src_loc $ - lookupConstr op `thenRn` \ new_op -> - rn_bang_ty ty1 `thenRn` \ new_ty1 -> - rn_bang_ty ty2 `thenRn` \ new_ty2 -> - returnRn (ConOpDecl new_ty1 new_op new_ty2 src_loc) - - rn_decl (NewConDecl name ty src_loc) - = pushSrcLocRn src_loc $ - lookupConstr name `thenRn` \ new_name -> - rn_mono_ty ty `thenRn` \ new_ty -> - returnRn (NewConDecl new_name new_ty src_loc) - - rn_decl (RecConDecl name fields src_loc) - = pushSrcLocRn src_loc $ - lookupConstr name `thenRn` \ new_name -> - mapRn rn_field fields `thenRn` \ new_fields -> - returnRn (RecConDecl new_name new_fields src_loc) - - rn_field (names, ty) - = mapRn lookupField names `thenRn` \ new_names -> - rn_bang_ty ty `thenRn` \ new_ty -> - returnRn (new_names, new_ty) - - rn_mono_ty = rnMonoType tv_env - rn_poly_ty = rnPolyType tv_env - - rn_bang_ty (Banged ty) - = rn_poly_ty ty `thenRn` \ new_ty -> - returnRn (Banged new_ty) - rn_bang_ty (Unbanged ty) - = rn_poly_ty ty `thenRn` \ new_ty -> - returnRn (Unbanged new_ty) -\end{code} + -- Tyvars scope over bindings and context + bindTyVars2Rn cls_doc tyvars $ \ clas_tyvar_names tyvars' -> -%********************************************************* -%* * -\subsection{SPECIALIZE data pragmas} -%* * -%********************************************************* + -- Check the superclasses + rnContext cls_doc context `thenRn` \ context' -> -\begin{code} -rnSpecDataSig :: RdrNameSpecDataSig - -> RnM_Fixes s RenamedSpecDataSig + -- Check the functional dependencies + rnFds cls_doc fds `thenRn` \ fds' -> -rnSpecDataSig (SpecDataSig tycon ty src_loc) - = pushSrcLocRn src_loc $ + -- Check the signatures + -- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs). let - tyvars = extractMonoTyNames is_tyvar_name ty + (op_sigs, non_op_sigs) = partition isClassOpSig sigs + sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs] in - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env,_) -> - lookupTyCon tycon `thenRn` \ tycon' -> - rnMonoType tv_env ty `thenRn` \ ty' -> - returnRn (SpecDataSig tycon' ty' src_loc) - -is_tyvar_name n = isLexVarId (getLocalName n) -\end{code} - -%********************************************************* -%* * -\subsection{Class declarations} -%* * -%********************************************************* + checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_` + mapRn (rnClassOp cname' clas_tyvar_names fds') op_sigs `thenRn` \ sigs' -> + let + binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ] + in + renameSigs (okClsDclSig binders) non_op_sigs `thenRn` \ non_ops' -> -@rnClassDecl@ uses the `global name function' to create a new -class declaration in which local names have been replaced by their -original names, reporting any unknown names. + -- Typechecker is responsible for checking that we only + -- give default-method bindings for things in this class. + -- The renamer *could* check this for class decls, but can't + -- for instance decls. -\begin{code} -rnClassDecl :: RdrNameClassDecl -> RnM_Fixes s RenamedClassDecl - -rnClassDecl (ClassDecl context cname tyvar sigs mbinds pragmas src_loc) - = pushSrcLocRn src_loc $ - mkTyVarNamesEnv src_loc [tyvar] `thenRn` \ (tv_env, [tyvar']) -> - rnContext tv_env src_loc context `thenRn` \ context' -> - lookupClass cname `thenRn` \ cname' -> - mapRn (rn_op cname' tyvar' tv_env) sigs `thenRn` \ sigs' -> - rnMethodBinds cname' mbinds `thenRn` \ mbinds' -> - ASSERT(isNoClassPragmas pragmas) - returnRn (ClassDecl context' cname' tyvar' sigs' mbinds' NoClassPragmas src_loc) + returnRn (ClassDecl context' cname' tyvars' fds' (non_ops' ++ sigs') EmptyMonoBinds names' src_loc) where - rn_op clas clas_tyvar tv_env sig@(ClassOpSig op ty pragmas locn) - = pushSrcLocRn locn $ - lookupClassOp clas op `thenRn` \ op_name -> - rnPolyType tv_env ty `thenRn` \ new_ty -> - let - (HsForAllTy tvs ctxt op_ty) = new_ty - ctxt_tvs = extractCtxtTyNames ctxt - op_tvs = extractMonoTyNames is_tyvar_name op_ty - in - -- check that class tyvar appears in op_ty - ( if isIn "rn_op" clas_tyvar op_tvs - then returnRn () - else addErrRn (classTyVarNotInOpTyErr clas_tyvar sig locn) - ) `thenRn_` - - -- check that class tyvar *doesn't* appear in the sig's context - ( if isIn "rn_op(2)" clas_tyvar ctxt_tvs - then addErrRn (classTyVarInOpCtxtErr clas_tyvar sig locn) - else returnRn () - ) `thenRn_` - - ASSERT(isNoClassOpPragmas pragmas) - returnRn (ClassOpSig op_name new_ty noClassOpPragmas locn) + cls_doc = text "the declaration for class" <+> ppr cname + sig_doc = text "the signatures for class" <+> ppr cname + +rnClassOp clas clas_tyvars clas_fds sig@(ClassOpSig op maybe_dm_stuff ty locn) + = pushSrcLocRn locn $ + lookupTopBndrRn op `thenRn` \ op_name -> + + -- Check the signature + rnHsSigType (quotes (ppr op)) ty `thenRn` \ new_ty -> + + -- Make the default-method name + (case maybe_dm_stuff of + Nothing -> returnRn Nothing -- Source-file class decl + + Just (DefMeth dm_rdr_name) + -> -- Imported class that has a default method decl + -- See comments with tname, snames, above + lookupSysBinder dm_rdr_name `thenRn` \ dm_name -> + returnRn (Just (DefMeth dm_name)) + -- An imported class decl for a class decl that had an explicit default + -- method, mentions, rather than defines, + -- the default method, so we must arrange to pull it in + + Just GenDefMeth -> returnRn (Just GenDefMeth) + Just NoDefMeth -> returnRn (Just NoDefMeth) + ) `thenRn` \ maybe_dm_stuff' -> + + returnRn (ClassOpSig op_name maybe_dm_stuff' new_ty locn) + +rnClassBinds :: RdrNameTyClDecl -> RenamedTyClDecl -> RnMS (RenamedTyClDecl, FreeVars) + -- Rename the mbinds only; the rest is done already +rnClassBinds (ClassDecl _ _ _ _ _ mbinds _ _ ) -- Get mbinds from here + (ClassDecl context cname tyvars fds sigs _ names src_loc) -- Everything else is here + = -- The newLocals call is tiresome: given a generic class decl + -- class C a where + -- op :: a -> a + -- op {| x+y |} (Inl a) = ... + -- op {| x+y |} (Inr b) = ... + -- op {| a*b |} (a*b) = ... + -- we want to name both "x" tyvars with the same unique, so that they are + -- easy to group together in the typechecker. + -- Hence the + extendTyVarEnvFVRn (map hsTyVarName tyvars) $ + getLocalNameEnv `thenRn` \ name_env -> + let + meth_rdr_names_w_locs = collectLocatedMonoBinders mbinds + gen_rdr_tyvars_w_locs = [(tv,src_loc) | tv <- extractGenericPatTyVars mbinds, + not (tv `elemRdrEnv` name_env)] + in + checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_` + newLocalsRn gen_rdr_tyvars_w_locs `thenRn` \ gen_tyvars -> + rnMethodBinds gen_tyvars mbinds `thenRn` \ (mbinds', meth_fvs) -> + returnRn (ClassDecl context cname tyvars fds sigs mbinds' names src_loc, meth_fvs) + where + meth_doc = text "the default-methods for class" <+> ppr cname + +rnClassBinds _ tycl_decl = returnRn (tycl_decl, emptyFVs) + -- Not a class declaration \end{code} %********************************************************* %* * -\subsection{Instance declarations} +\subsection{Support code for type/data declarations} %* * %********************************************************* +\begin{code} +rnDerivs :: Maybe [RdrName] -> RnMS (Maybe [Name]) -@rnInstDecl@ uses the `global name function' to create a new of -instance declaration in which local names have been replaced by their -original names, reporting any unknown names. +rnDerivs Nothing -- derivs not specified + = returnRn Nothing -\begin{code} -rnInstDecl :: RdrNameInstDecl -> RnM_Fixes s RenamedInstDecl +rnDerivs (Just clss) + = mapRn do_one clss `thenRn` \ clss' -> + returnRn (Just clss') + where + do_one cls = lookupOccRn cls `thenRn` \ clas_name -> + checkRn (getUnique clas_name `elem` derivableClassKeys) + (derivingNonStdClassErr clas_name) `thenRn_` + returnRn clas_name +\end{code} -rnInstDecl (InstDecl cname ty mbinds from_here modname uprags pragmas src_loc) - = pushSrcLocRn src_loc $ - lookupClass cname `thenRn` \ cname' -> +\begin{code} +conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc) +conDeclName (ConDecl n _ _ _ _ l) = (n,l) + +rnConDecl :: RdrNameConDecl -> RnMS RenamedConDecl +rnConDecl (ConDecl name wkr tvs cxt details locn) + = pushSrcLocRn locn $ + checkConName name `thenRn_` + lookupTopBndrRn name `thenRn` \ new_name -> + + lookupSysBinder wkr `thenRn` \ new_wkr -> + -- See comments with ClassDecl + + bindTyVarsRn doc tvs $ \ new_tyvars -> + rnContext doc cxt `thenRn` \ new_context -> + rnConDetails doc locn details `thenRn` \ new_details -> + returnRn (ConDecl new_name new_wkr new_tyvars new_context new_details locn) + where + doc = text "the definition of data constructor" <+> quotes (ppr name) - rnPolyType [] ty `thenRn` \ ty' -> - -- [] tv_env ensures that tyvars will be foralled +rnConDetails doc locn (VanillaCon tys) + = mapRn (rnBangTy doc) tys `thenRn` \ new_tys -> + returnRn (VanillaCon new_tys) - rnMethodBinds cname' mbinds `thenRn` \ mbinds' -> - mapRn (rn_uprag cname') uprags `thenRn` \ new_uprags -> +rnConDetails doc locn (InfixCon ty1 ty2) + = rnBangTy doc ty1 `thenRn` \ new_ty1 -> + rnBangTy doc ty2 `thenRn` \ new_ty2 -> + returnRn (InfixCon new_ty1 new_ty2) - ASSERT(isNoInstancePragmas pragmas) - returnRn (InstDecl cname' ty' mbinds' - from_here modname new_uprags noInstancePragmas src_loc) +rnConDetails doc locn (RecCon fields) + = checkDupOrQualNames doc field_names `thenRn_` + mapRn (rnField doc) fields `thenRn` \ new_fields -> + returnRn (RecCon new_fields) where - rn_uprag class_name (SpecSig op ty using locn) - = pushSrcLocRn src_loc $ - lookupClassOp class_name op `thenRn` \ op_name -> - rnPolyType nullTyVarNamesEnv ty `thenRn` \ new_ty -> - rn_using using `thenRn` \ new_using -> - returnRn (SpecSig op_name new_ty new_using locn) - - rn_uprag class_name (InlineSig op locn) - = pushSrcLocRn locn $ - lookupClassOp class_name op `thenRn` \ op_name -> - returnRn (InlineSig op_name locn) - - rn_uprag class_name (DeforestSig op locn) - = pushSrcLocRn locn $ - lookupClassOp class_name op `thenRn` \ op_name -> - returnRn (DeforestSig op_name locn) - - rn_uprag class_name (MagicUnfoldingSig op str locn) - = pushSrcLocRn locn $ - lookupClassOp class_name op `thenRn` \ op_name -> - returnRn (MagicUnfoldingSig op_name str locn) - - rn_using Nothing - = returnRn Nothing - rn_using (Just v) - = lookupValue v `thenRn` \ new_v -> - returnRn (Just new_v) + field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds] + +rnField doc (names, ty) + = mapRn lookupTopBndrRn names `thenRn` \ new_names -> + rnBangTy doc ty `thenRn` \ new_ty -> + returnRn (new_names, new_ty) + +rnBangTy doc (Banged ty) + = rnHsType doc ty `thenRn` \ new_ty -> + returnRn (Banged new_ty) + +rnBangTy doc (Unbanged ty) + = rnHsType doc ty `thenRn` \ new_ty -> + returnRn (Unbanged new_ty) + +rnBangTy doc (Unpacked ty) + = rnHsType doc ty `thenRn` \ new_ty -> + returnRn (Unpacked new_ty) + +-- This data decl will parse OK +-- data T = a Int +-- treating "a" as the constructor. +-- It is really hard to make the parser spot this malformation. +-- So the renamer has to check that the constructor is legal +-- +-- We can get an operator as the constructor, even in the prefix form: +-- data T = :% Int Int +-- from interface files, which always print in prefix form + +checkConName name + = checkRn (isRdrDataCon name) + (badDataCon name) \end{code} + %********************************************************* %* * -\subsection{@SPECIALIZE instance@ user-pragmas} +\subsection{Support code to rename types} %* * %********************************************************* \begin{code} -rnSpecInstSig :: RdrNameSpecInstSig - -> RnM_Fixes s RenamedSpecInstSig - -rnSpecInstSig (SpecInstSig clas ty src_loc) - = pushSrcLocRn src_loc $ +rnHsTypeFVs :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars) +rnHsTypeFVs doc_str ty + = rnHsType doc_str ty `thenRn` \ ty' -> + returnRn (ty', extractHsTyNames ty') + +rnHsSigTypeFVs :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars) +rnHsSigTypeFVs doc_str ty + = rnHsSigType doc_str ty `thenRn` \ ty' -> + returnRn (ty', extractHsTyNames ty') + +rnHsSigType :: SDoc -> RdrNameHsType -> RnMS RenamedHsType + -- rnHsSigType is used for source-language type signatures, + -- which use *implicit* universal quantification. +rnHsSigType doc_str ty + = rnHsType (text "the type signature for" <+> doc_str) ty + +--------------------------------------- +rnHsType :: SDoc -> RdrNameHsType -> RnMS RenamedHsType + +rnHsType doc (HsForAllTy Nothing ctxt ty) + -- Implicit quantifiction in source code (no kinds on tyvars) + -- Given the signature C => T we universally quantify + -- over FV(T) \ {in-scope-tyvars} + = getLocalNameEnv `thenRn` \ name_env -> let - tyvars = extractMonoTyNames is_tyvar_name ty + mentioned_in_tau = extractHsTyRdrTyVars ty + mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt + mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt) + forall_tyvars = filter (not . (`elemRdrEnv` name_env)) mentioned in - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env,_) -> - lookupClass clas `thenRn` \ new_clas -> - rnMonoType tv_env ty `thenRn` \ new_ty -> - returnRn (SpecInstSig new_clas new_ty src_loc) -\end{code} - -%********************************************************* -%* * -\subsection{Default declarations} -%* * -%********************************************************* + rnForAll doc (map UserTyVar forall_tyvars) ctxt ty -@rnDefaultDecl@ uses the `global name function' to create a new set -of default declarations in which local names have been replaced by -their original names, reporting any unknown names. +rnHsType doc (HsForAllTy (Just forall_tyvars) ctxt tau) + -- Explicit quantification. + -- Check that the forall'd tyvars are actually + -- mentioned in the type, and produce a warning if not + = let + mentioned_in_tau = extractHsTyRdrTyVars tau + mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt + mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt) + forall_tyvar_names = hsTyVarNames forall_tyvars -\begin{code} -rnDefaultDecl :: [RdrNameDefaultDecl] -> RnM_Fixes s [RenamedDefaultDecl] + -- Explicitly quantified but not mentioned in ctxt or tau + warn_guys = filter (`notElem` mentioned) forall_tyvar_names + in + mapRn_ (forAllWarn doc tau) warn_guys `thenRn_` + rnForAll doc forall_tyvars ctxt tau + +rnHsType doc (HsTyVar tyvar) + = lookupOccRn tyvar `thenRn` \ tyvar' -> + returnRn (HsTyVar tyvar') + +rnHsType doc (HsOpTy ty1 opname ty2) + = lookupOccRn opname `thenRn` \ name' -> + rnHsType doc ty1 `thenRn` \ ty1' -> + rnHsType doc ty2 `thenRn` \ ty2' -> + returnRn (HsOpTy ty1' name' ty2') + +rnHsType doc (HsNumTy i) + | i == 1 = returnRn (HsNumTy i) + | otherwise = failWithRn (HsNumTy i) + (ptext SLIT("Only unit numeric type pattern is valid")) + +rnHsType doc (HsFunTy ty1 ty2) + = rnHsType doc ty1 `thenRn` \ ty1' -> + -- Might find a for-all as the arg of a function type + rnHsType doc ty2 `thenRn` \ ty2' -> + -- Or as the result. This happens when reading Prelude.hi + -- when we find return :: forall m. Monad m -> forall a. a -> m a + returnRn (HsFunTy ty1' ty2') + +rnHsType doc (HsListTy ty) + = rnHsType doc ty `thenRn` \ ty' -> + returnRn (HsListTy ty') + +-- Unboxed tuples are allowed to have poly-typed arguments. These +-- sometimes crop up as a result of CPR worker-wrappering dictionaries. +rnHsType doc (HsTupleTy (HsTupCon _ boxity) tys) + -- Don't do lookupOccRn, because this is built-in syntax + -- so it doesn't need to be in scope + = mapRn (rnHsType doc) tys `thenRn` \ tys' -> + returnRn (HsTupleTy (HsTupCon n' boxity) tys') + where + n' = tupleTyCon_name boxity (length tys) + + +rnHsType doc (HsAppTy ty1 ty2) + = rnHsType doc ty1 `thenRn` \ ty1' -> + rnHsType doc ty2 `thenRn` \ ty2' -> + returnRn (HsAppTy ty1' ty2') + +rnHsType doc (HsPredTy pred) + = rnPred doc pred `thenRn` \ pred' -> + returnRn (HsPredTy pred') + +rnHsType doc (HsUsgForAllTy uv_rdr ty) + = bindUVarRn uv_rdr $ \ uv_name -> + rnHsType doc ty `thenRn` \ ty' -> + returnRn (HsUsgForAllTy uv_name ty') + +rnHsType doc (HsUsgTy usg ty) + = newUsg usg `thenRn` \ usg' -> + rnHsType doc ty `thenRn` \ ty' -> + -- A for-all can occur inside a usage annotation + returnRn (HsUsgTy usg' ty') + where + newUsg usg = case usg of + HsUsOnce -> returnRn HsUsOnce + HsUsMany -> returnRn HsUsMany + HsUsVar uv_rdr -> lookupOccRn uv_rdr `thenRn` \ uv_name -> + returnRn (HsUsVar uv_name) -rnDefaultDecl [] = returnRn [] -rnDefaultDecl [DefaultDecl tys src_loc] - = pushSrcLocRn src_loc $ - mapRn (rnMonoType nullTyVarNamesEnv) tys `thenRn` \ tys' -> - returnRn [DefaultDecl tys' src_loc] -rnDefaultDecl defs@(d:ds) - = addErrRn (dupDefaultDeclErr defs) `thenRn_` - rnDefaultDecl [d] +rnHsTypes doc tys = mapRn (rnHsType doc) tys \end{code} -%************************************************************************* -%* * -\subsection{Fixity declarations} -%* * -%************************************************************************* +\begin{code} +-- We use lookupOcc here because this is interface file only stuff +-- and we need the workers... +rnHsTupCon (HsTupCon n boxity) + = lookupOccRn n `thenRn` \ n' -> + returnRn (HsTupCon n' boxity) + +rnHsTupConWkr (HsTupCon n boxity) + -- Tuple construtors are for the *worker* of the tuple + -- Going direct saves needless messing about + = lookupOccRn (mkRdrNameWkr n) `thenRn` \ n' -> + returnRn (HsTupCon n' boxity) +\end{code} \begin{code} -rnFixes :: [RdrNameFixityDecl] -> RnM s [RenamedFixityDecl] +rnForAll doc forall_tyvars ctxt ty + = bindTyVarsRn doc forall_tyvars $ \ new_tyvars -> + rnContext doc ctxt `thenRn` \ new_ctxt -> + rnHsType doc ty `thenRn` \ new_ty -> + returnRn (mkHsForAllTy (Just new_tyvars) new_ctxt new_ty) +\end{code} -rnFixes fixities - = getSrcLocRn `thenRn` \ src_loc -> +\begin{code} +rnContext :: SDoc -> RdrNameContext -> RnMS RenamedContext +rnContext doc ctxt + = mapRn rn_pred ctxt `thenRn` \ theta -> let - (_, dup_fixes) = removeDups cmp_fix fixities - cmp_fix fix1 fix2 = fixDeclName fix1 `cmp` fixDeclName fix2 - - rn_fixity fix@(InfixL name i) - = rn_fixity_pieces InfixL name i fix - rn_fixity fix@(InfixR name i) - = rn_fixity_pieces InfixR name i fix - rn_fixity fix@(InfixN name i) - = rn_fixity_pieces InfixN name i fix - - rn_fixity_pieces mk_fixity name i fix - = getRnEnv `thenRn` \ env -> - case lookupGlobalRnEnv env name of - Just res | isLocallyDefined res -- || opt_CompilingGhcInternals - -- the opt_CompilingGhcInternals thing is a *HACK* to get (:)'s - -- fixity decl to go through. It has a builtin name, which - -- doesn't respond to isLocallyDefined... sigh. - -> returnRn (Just (mk_fixity res i)) - _ -> failButContinueRn Nothing (undefinedFixityDeclErr src_loc fix) + (_, dups) = removeDupsEq theta + -- We only have equality, not ordering in - mapRn (addErrRn . dupFixityDeclErr src_loc) dup_fixes `thenRn_` - mapRn rn_fixity fixities `thenRn` \ fixes_maybe -> - returnRn (catMaybes fixes_maybe) + -- Check for duplicate assertions + -- If this isn't an error, then it ought to be: + mapRn (addWarnRn . dupClassAssertWarn theta) dups `thenRn_` + returnRn theta + where + --Someone discovered that @CCallable@ and @CReturnable@ + -- could be used in contexts such as: + -- foo :: CCallable a => a -> PrimIO Int + -- Doing this utterly wrecks the whole point of introducing these + -- classes so we specifically check that this isn't being done. + rn_pred pred = rnPred doc pred `thenRn` \ pred'-> + checkRn (not (bad_pred pred')) + (naughtyCCallContextErr pred') `thenRn_` + returnRn pred' + + bad_pred (HsPClass clas _) = getUnique clas `elem` cCallishClassKeys + bad_pred other = False + + +rnPred doc (HsPClass clas tys) + = lookupOccRn clas `thenRn` \ clas_name -> + rnHsTypes doc tys `thenRn` \ tys' -> + returnRn (HsPClass clas_name tys') + +rnPred doc (HsPIParam n ty) + = newIPName n `thenRn` \ name -> + rnHsType doc ty `thenRn` \ ty' -> + returnRn (HsPIParam name ty') +\end{code} + +\begin{code} +rnFds :: SDoc -> [FunDep RdrName] -> RnMS [FunDep Name] + +rnFds doc fds + = mapRn rn_fds fds + where + rn_fds (tys1, tys2) + = rnHsTyVars doc tys1 `thenRn` \ tys1' -> + rnHsTyVars doc tys2 `thenRn` \ tys2' -> + returnRn (tys1', tys2') + +rnHsTyVars doc tvs = mapRn (rnHsTyvar doc) tvs +rnHsTyvar doc tyvar = lookupOccRn tyvar \end{code} %********************************************************* -%* * -\subsection{Support code to rename types} -%* * +%* * +\subsection{IdInfo} +%* * %********************************************************* \begin{code} -rnPolyType :: TyVarNamesEnv - -> RdrNamePolyType - -> RnM_Fixes s RenamedPolyType +rnIdInfo (HsWorker worker) + = lookupOccRn worker `thenRn` \ worker' -> + returnRn (HsWorker worker') + +rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ expr' -> + returnRn (HsUnfold inline expr') +rnIdInfo (HsStrictness str) = returnRn (HsStrictness str) +rnIdInfo (HsArity arity) = returnRn (HsArity arity) +rnIdInfo HsNoCafRefs = returnRn HsNoCafRefs +rnIdInfo HsCprInfo = returnRn HsCprInfo +\end{code} -rnPolyType tv_env (HsForAllTy tvs ctxt ty) - = rn_poly_help tv_env tvs ctxt ty +@UfCore@ expressions. -rnPolyType tv_env (HsPreForAllTy ctxt ty) - = rn_poly_help tv_env forall_tyvars ctxt ty +\begin{code} +rnCoreExpr (UfType ty) + = rnHsType (text "unfolding type") ty `thenRn` \ ty' -> + returnRn (UfType ty') + +rnCoreExpr (UfVar v) + = lookupOccRn v `thenRn` \ v' -> + returnRn (UfVar v') + +rnCoreExpr (UfLit l) + = returnRn (UfLit l) + +rnCoreExpr (UfLitLit l ty) + = rnHsType (text "litlit") ty `thenRn` \ ty' -> + returnRn (UfLitLit l ty') + +rnCoreExpr (UfCCall cc ty) + = rnHsType (text "ccall") ty `thenRn` \ ty' -> + returnRn (UfCCall cc ty') + +rnCoreExpr (UfTuple con args) + = rnHsTupConWkr con `thenRn` \ con' -> + mapRn rnCoreExpr args `thenRn` \ args' -> + returnRn (UfTuple con' args') + +rnCoreExpr (UfApp fun arg) + = rnCoreExpr fun `thenRn` \ fun' -> + rnCoreExpr arg `thenRn` \ arg' -> + returnRn (UfApp fun' arg') + +rnCoreExpr (UfCase scrut bndr alts) + = rnCoreExpr scrut `thenRn` \ scrut' -> + bindCoreLocalRn bndr $ \ bndr' -> + mapRn rnCoreAlt alts `thenRn` \ alts' -> + returnRn (UfCase scrut' bndr' alts') + +rnCoreExpr (UfNote note expr) + = rnNote note `thenRn` \ note' -> + rnCoreExpr expr `thenRn` \ expr' -> + returnRn (UfNote note' expr') + +rnCoreExpr (UfLam bndr body) + = rnCoreBndr bndr $ \ bndr' -> + rnCoreExpr body `thenRn` \ body' -> + returnRn (UfLam bndr' body') + +rnCoreExpr (UfLet (UfNonRec bndr rhs) body) + = rnCoreExpr rhs `thenRn` \ rhs' -> + rnCoreBndr bndr $ \ bndr' -> + rnCoreExpr body `thenRn` \ body' -> + returnRn (UfLet (UfNonRec bndr' rhs') body') + +rnCoreExpr (UfLet (UfRec pairs) body) + = rnCoreBndrs bndrs $ \ bndrs' -> + mapRn rnCoreExpr rhss `thenRn` \ rhss' -> + rnCoreExpr body `thenRn` \ body' -> + returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body') where - mentioned_tyvars = extractCtxtTyNames ctxt `unionLists` extractMonoTyNames is_tyvar_name ty - forall_tyvars = {- - pprTrace "mentioned:" (ppCat (map (ppr PprShowAll) mentioned_tyvars)) $ - pprTrace "from_ty:" (ppCat (map (ppr PprShowAll) (extractMonoTyNames is_tyvar_name ty))) $ - -} - mentioned_tyvars `minusList` domTyVarNamesEnv tv_env - ------------- -rn_poly_help :: TyVarNamesEnv - -> [RdrName] - -> RdrNameContext - -> RdrNameMonoType - -> RnM_Fixes s RenamedPolyType - -rn_poly_help tv_env tyvars ctxt ty - = {- - pprTrace "rnPolyType:" - (ppCat [ppCat (map (ppr PprShowAll . snd) tv_env), - ppStr ";tvs=", ppCat (map (ppr PprShowAll) tyvars), - ppStr ";ctxt=", ppCat (map (ppr PprShowAll) ctxt), - ppStr ";ty=", ppr PprShowAll ty]) $ - -} - getSrcLocRn `thenRn` \ src_loc -> - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env1, new_tyvars) -> - let - tv_env2 = catTyVarNamesEnvs tv_env1 tv_env - in - rnContext tv_env2 src_loc ctxt `thenRn` \ new_ctxt -> - rnMonoType tv_env2 ty `thenRn` \ new_ty -> - returnRn (HsForAllTy new_tyvars new_ctxt new_ty) + (bndrs, rhss) = unzip pairs \end{code} \begin{code} -rnMonoType :: TyVarNamesEnv - -> RdrNameMonoType - -> RnM_Fixes s RenamedMonoType +rnCoreBndr (UfValBinder name ty) thing_inside + = rnHsType doc ty `thenRn` \ ty' -> + bindCoreLocalRn name $ \ name' -> + thing_inside (UfValBinder name' ty') + where + doc = text "unfolding id" + +rnCoreBndr (UfTyBinder name kind) thing_inside + = bindCoreLocalRn name $ \ name' -> + thing_inside (UfTyBinder name' kind) + +rnCoreBndrs [] thing_inside = thing_inside [] +rnCoreBndrs (b:bs) thing_inside = rnCoreBndr b $ \ name' -> + rnCoreBndrs bs $ \ names' -> + thing_inside (name':names') +\end{code} -rnMonoType tv_env (MonoTyVar tyvar) - = lookupTyVarName tv_env tyvar `thenRn` \ tyvar' -> - returnRn (MonoTyVar tyvar') +\begin{code} +rnCoreAlt (con, bndrs, rhs) + = rnUfCon con bndrs `thenRn` \ con' -> + bindCoreLocalsRn bndrs $ \ bndrs' -> + rnCoreExpr rhs `thenRn` \ rhs' -> + returnRn (con', bndrs', rhs') -rnMonoType tv_env (MonoListTy ty) - = rnMonoType tv_env ty `thenRn` \ ty' -> - returnRn (MonoListTy ty') +rnNote (UfCoerce ty) + = rnHsType (text "unfolding coerce") ty `thenRn` \ ty' -> + returnRn (UfCoerce ty') -rnMonoType tv_env (MonoFunTy ty1 ty2) - = andRn MonoFunTy (rnMonoType tv_env ty1) - (rnMonoType tv_env ty2) +rnNote (UfSCC cc) = returnRn (UfSCC cc) +rnNote UfInlineCall = returnRn UfInlineCall +rnNote UfInlineMe = returnRn UfInlineMe -rnMonoType tv_env (MonoTupleTy tys) - = mapRn (rnMonoType tv_env) tys `thenRn` \ tys' -> - returnRn (MonoTupleTy tys') -rnMonoType tv_env (MonoTyApp name tys) - = let - lookup_fn = if isLexVarId (getLocalName name) - then lookupTyVarName tv_env - else lookupTyCon - in - lookup_fn name `thenRn` \ name' -> - mapRn (rnMonoType tv_env) tys `thenRn` \ tys' -> - returnRn (MonoTyApp name' tys') -\end{code} +rnUfCon UfDefault _ + = returnRn UfDefault -\begin{code} -rnContext :: TyVarNamesEnv -> SrcLoc -> RdrNameContext -> RnM_Fixes s RenamedContext +rnUfCon (UfTupleAlt tup_con) bndrs + = rnHsTupCon tup_con `thenRn` \ (HsTupCon con' _) -> + returnRn (UfDataAlt con') + -- Makes the type checker a little easier -rnContext tv_env locn ctxt - = mapRn rn_ctxt ctxt `thenRn` \ result -> - let - (_, dup_asserts) = removeDups cmp_assert result - in - -- If this isn't an error, then it ought to be: - mapRn (addWarnRn . dupClassAssertWarn result locn) dup_asserts `thenRn_` - returnRn result - where - rn_ctxt (clas, tyvar) - = lookupClass clas `thenRn` \ clas_name -> - lookupTyVarName tv_env tyvar `thenRn` \ tyvar_name -> - returnRn (clas_name, tyvar_name) +rnUfCon (UfDataAlt con) _ + = lookupOccRn con `thenRn` \ con' -> + returnRn (UfDataAlt con') + +rnUfCon (UfLitAlt lit) _ + = returnRn (UfLitAlt lit) - cmp_assert (c1,tv1) (c2,tv2) - = (c1 `cmp` c2) `thenCmp` (tv1 `cmp` tv2) +rnUfCon (UfLitLitAlt lit ty) _ + = rnHsType (text "litlit") ty `thenRn` \ ty' -> + returnRn (UfLitLitAlt lit ty') \end{code} +%********************************************************* +%* * +\subsection{Rule shapes} +%* * +%********************************************************* + +Check the shape of a transformation rule LHS. Currently +we only allow LHSs of the form @(f e1 .. en)@, where @f@ is +not one of the @forall@'d variables. \begin{code} -dupNameExportWarn locn names@((n,_):_) - = addShortWarnLocLine locn $ \ sty -> - ppCat [pprNonSym sty n, ppStr "exported", ppInt (length names), ppStr "times"] - -dupLocalsExportErr locn locals@((str,_):_) - = addErrLoc locn "exported names have same local name" $ \ sty -> - ppInterleave ppSP (map (pprNonSym sty . snd) locals) - -classOpExportErr op locn - = addShortErrLocLine locn $ \ sty -> - ppBesides [ppStr "class operation `", ppr sty op, ppStr "' can only be exported with its class"] - -fieldExportErr op locn - = addShortErrLocLine locn $ \ sty -> - ppBesides [ppStr "field name `", ppr sty op, ppStr "' can only be exported with its data type"] - -synAllExportErr is_error syn locn - = (if is_error then addShortErrLocLine else addShortWarnLocLine) locn $ \ sty -> - ppBesides [ppStr "type synonym `", ppr sty syn, ppStr "' should be exported abstractly"] - -withExportErr str rn has rns locn - = addErrLoc locn "" $ \ sty -> - ppAboves [ ppBesides [ppStr "inconsistent list of ", ppStr str, ppStr " in export list for `", ppr sty rn, ppStr "'"], - ppCat [ppStr " expected:", ppInterleave ppComma (map (ppr sty) has)], - ppCat [ppStr " found: ", ppInterleave ppComma (map (ppr sty) rns)] ] - -importAllErr rn locn - = addShortErrLocLine locn $ \ sty -> - ppBesides [ ppStr "`", pprNonSym sty rn, ppStr "' has been exported with (..), but is only imported abstractly"] - -badModExportErr mod locn - = addShortErrLocLine locn $ \ sty -> - ppCat [ ppStr "unknown module in export list: module", ppPStr mod] - -emptyModExportWarn locn mod - = addShortWarnLocLine locn $ \ sty -> - ppCat [ppStr "module", ppPStr mod, ppStr "has no unqualified imports to export"] - -dupModExportWarn locn mods@(mod:_) - = addShortWarnLocLine locn $ \ sty -> - ppCat [ppStr "module", ppPStr mod, ppStr "appears", ppInt (length mods), ppStr "times in export list"] - -derivingNonStdClassErr clas locn - = addShortErrLocLine locn $ \ sty -> - ppCat [ppStr "non-standard class in deriving:", ppr sty clas] - -dupDefaultDeclErr (DefaultDecl _ locn1 : dup_things) sty - = ppAboves (item1 : map dup_item dup_things) +validRuleLhs foralls lhs + = check lhs where - item1 - = addShortErrLocLine locn1 (\ sty -> - ppStr "multiple default declarations") sty - - dup_item (DefaultDecl _ locn) - = addShortErrLocLine locn (\ sty -> - ppStr "here was another default declaration") sty - -undefinedFixityDeclErr locn decl - = addErrLoc locn "fixity declaration for unknown operator" $ \ sty -> - ppr sty decl - -dupFixityDeclErr locn dups - = addErrLoc locn "multiple fixity declarations for same operator" $ \ sty -> - ppAboves (map (ppr sty) dups) - -classTyVarNotInOpTyErr clas_tyvar sig locn - = addShortErrLocLine locn $ \ sty -> - ppHang (ppBesides [ppStr "Class type variable `", ppr sty clas_tyvar, ppStr "' does not appear in method signature:"]) - 4 (ppr sty sig) - -classTyVarInOpCtxtErr clas_tyvar sig locn - = addShortErrLocLine locn $ \ sty -> - ppHang (ppBesides [ppStr "Class type variable `", ppr sty clas_tyvar, ppStr "' present in method's local overloading context:"]) - 4 (ppr sty sig) - -dupClassAssertWarn ctxt locn dups - = addShortWarnLocLine locn $ \ sty -> - ppHang (ppBesides [ppStr "Duplicate class assertion `", ppr sty dups, ppStr "' in context:"]) - 4 (ppr sty ctxt) + check (HsApp e1 e2) = check e1 + check (HsVar v) | v `notElem` foralls = True + check other = False +\end{code} + + +%********************************************************* +%* * +\subsection{Errors} +%* * +%********************************************************* + +\begin{code} +derivingNonStdClassErr clas + = hsep [ptext SLIT("non-standard class"), ppr clas, ptext SLIT("in deriving clause")] + +badDataCon name + = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)] + +forAllWarn doc ty tyvar + = doptRn Opt_WarnUnusedMatches `thenRn` \ warn_unused -> case () of + () | not warn_unused -> returnRn () + | otherwise + -> getModeRn `thenRn` \ mode -> + case mode of { +#ifndef DEBUG + InterfaceMode -> returnRn () ; -- Don't warn of unused tyvars in interface files + -- unless DEBUG is on, in which case it is slightly + -- informative. They can arise from mkRhsTyLam, +#endif -- leading to (say) f :: forall a b. [b] -> [b] + other -> + addWarnRn ( + sep [ptext SLIT("The universally quantified type variable") <+> quotes (ppr tyvar), + nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))] + $$ + (ptext SLIT("In") <+> doc) + ) + } + +badRuleLhsErr name lhs + = sep [ptext SLIT("Rule") <+> ptext name <> colon, + nest 4 (ptext SLIT("Illegal left-hand side:") <+> ppr lhs)] + $$ + ptext SLIT("LHS must be of form (f e1 .. en) where f is not forall'd") + +badRuleVar name var + = sep [ptext SLIT("Rule") <+> ptext name <> colon, + ptext SLIT("Forall'd variable") <+> quotes (ppr var) <+> + ptext SLIT("does not appear on left hand side")] + +badExtName :: ExtName -> Message +badExtName ext_nm + = sep [quotes (ppr ext_nm) <+> ptext SLIT("is not a valid C identifier")] + +dupClassAssertWarn ctxt (assertion : dups) + = sep [hsep [ptext SLIT("Duplicate class assertion"), + quotes (ppr assertion), + ptext SLIT("in the context:")], + nest 4 (pprHsContext ctxt <+> ptext SLIT("..."))] + +naughtyCCallContextErr (HsPClass clas _) + = sep [ptext SLIT("Can't use class") <+> quotes (ppr clas), + ptext SLIT("in a context")] \end{code}