X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnSource.lhs;h=68b817f21b6a58bebb0117e1793cfe48becf2b90;hb=00eefb90925f224c1e22963df2a00d70fe934d5f;hp=2d608011fae6960cb124e3b33ea5839cb10d7647;hpb=a77abe6a30ea2763cfa1c0ca83cdce9b7200ced2;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnSource.lhs b/ghc/compiler/rename/RnSource.lhs index 2d60801..68b817f 100644 --- a/ghc/compiler/rename/RnSource.lhs +++ b/ghc/compiler/rename/RnSource.lhs @@ -1,43 +1,60 @@ % -% (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, rnSourceDecls, rnHsType, rnHsSigType ) where -import Ubiq -import RnLoop -- *check* the RnPass/RnExpr/RnBinds loop-breaking +#include "HsVersions.h" +import RnExpr import HsSyn import HsPragmas -import RdrHsSyn +import HsTypes ( getTyVarName, pprClassAssertion, cmpHsTypes ) +import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, isRdrTyVar ) +import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl, + extractHsTyRdrNames, extractRuleBndrsTyVars + ) import RnHsSyn +import HsCore + +import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, unknownSigErr ) +import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn, + lookupImplicitOccRn, + bindLocalsRn, bindLocalRn, bindLocalsFVRn, + bindTyVarsFVRn, bindTyVarsFV2Rn, extendTyVarEnvFVRn, + bindCoreLocalFVRn, bindCoreLocalsFVRn, + checkDupOrQualNames, checkDupNames, + mkImportedGlobalName, mkImportedGlobalFromRdrName, + newDFunName, getDFunKey, newImplicitBinder, + FreeVars, emptyFVs, plusFV, plusFVs, unitFV, addOneFV, mapFvRn + ) import RnMonad -import RnBinds ( rnTopBinds, rnMethodBinds ) -import RnUtils ( lookupGlobalRnEnv, lubExportFlag ) - -import Bag ( emptyBag, unitBag, consBag, unionManyBags, unionBags, listToBag, bagToList ) -import Class ( derivableClassKeys ) -import ErrUtils ( addErrLoc, addShortErrLocLine ) -import FiniteMap ( emptyFM, lookupFM, addListToFM_C ) -import ListSetOps ( unionLists, minusList ) -import Maybes ( maybeToBool, catMaybes ) -import Name ( Name, isLocallyDefined, isLexVarId, getLocalName, ExportFlag(..), - nameImportFlag, RdrName, pprNonSym ) -import Outputable -- ToDo:rm -import PprStyle -- ToDo:rm -import Pretty + +import Name ( Name, OccName, + ExportFlag(..), Provenance(..), + nameOccName, NamedThing(..) + ) +import NameSet +import OccName ( mkDefaultMethodOcc ) +import BasicTypes ( TopLevelFlag(..) ) +import FiniteMap ( elemFM ) +import PrelInfo ( derivingOccurrences, numClass_RDR, + deRefStablePtr_NAME, makeStablePtr_NAME, + bindIO_NAME + ) +import Bag ( bagToList ) +import List ( partition, nub ) +import Outputable import SrcLoc ( SrcLoc ) -import Unique ( Unique ) -import UniqFM ( emptyUFM, addListToUFM_C, listToUFM, lookupUFM, eltsUFM ) -import UniqSet ( UniqSet(..) ) -import Util ( isIn, isn'tIn, sortLt, removeDups, cmpPString, assertPanic, pprTrace{-ToDo:rm-} ) +import CmdLineOpts ( opt_WarnUnusedMatches ) -- Warn of unused for-all'd tyvars +import UniqFM ( lookupUFM ) +import Maybes ( maybeToBool, catMaybes ) +import Util \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} @@ -51,199 +68,49 @@ Checks the (..) etc constraints in the export list. \end{enumerate} -\begin{code} -rnSource :: [Module] - -> Bag (Module,RnName) -- unqualified imports from module - -> Bag RenamedFixityDecl -- fixity info for imported names - -> RdrNameHsModule - -> RnM s (RenamedHsModule, - Name -> ExportFlag, -- export info - 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) - - = pushSrcLocRn src_loc $ +%********************************************************* +%* * +\subsection{Value declarations} +%* * +%********************************************************* - rnExports (mod:imp_mods) unqual_imps exports `thenRn` \ exported_fn -> - rnFixes fixes `thenRn` \ src_fixes -> - let - pair_name inf = (nameFixDecl inf, inf) +\begin{code} +rnSourceDecls :: [RdrNameHsDecl] -> RnMS ([RenamedHsDecl], FreeVars) + -- The decls get reversed, but that's ok - all_fixes = src_fixes ++ bagToList imp_fixes - all_fixes_fm = listToUFM (map pair_name all_fixes) - 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, - occ_info - ) +rnSourceDecls decls + = go emptyFVs [] decls where - trashed_exports = {-trace "rnSource:trashed_exports"-} Nothing - trashed_imports = {-trace "rnSource:trashed_imports"-} [] + -- Fixity decls 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' (d:ds) = rnDecl d `thenRn` \(d', fvs') -> + go (fvs `plusFV` fvs') (d':ds') ds \end{code} %********************************************************* %* * -\subsection{Export list} +\subsection{Value declarations} %* * %********************************************************* \begin{code} -rnExports :: [Module] - -> Bag (Module,RnName) - -> Maybe [RdrNameIE] - -> RnM s (Name -> ExportFlag) +-- rnDecl does all the work +rnDecl :: RdrNameHsDecl -> RnMS (RenamedHsDecl, FreeVars) -rnExports mods unqual_imps Nothing - = returnRn (\n -> if isLocallyDefined n then ExportAll else NotExported) +rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) -> + returnRn (ValD new_binds, fvs) -rnExports mods unqual_imps (Just exps) - = mapAndUnzipRn (rnIE mods) exps `thenRn` \ (mod_maybes, exp_bags) -> - let - exp_names = bagToList (unionManyBags exp_bags) - exp_mods = catMaybes mod_maybes - - -- Warn for duplicate names and modules - (uniq_exp_names, dup_names) = removeDups cmp_fst exp_names - (uniq_exp_mods, dup_mods) = removeDups cmpPString exp_mods - cmp_fst (x,_) (y,_) = x `cmp` y - - -- Build finite map of exported names to export flag - exp_map0 = addListToUFM_C lub_expflag emptyUFM (map pair_fst uniq_exp_names) - (exp_map1, empty_mods) = foldl add_mod_names (exp_map0, []) uniq_exp_mods - - mod_fm = addListToFM_C unionBags emptyFM - [(mod, unitBag (getName rn, nameImportFlag (getName rn))) - | (mod,rn) <- bagToList unqual_imps] - - add_mod_names (exp_map, empty) mod - = case lookupFM mod_fm mod of - Nothing -> (exp_map, mod:empty) - Just mod_names -> (addListToUFM_C lub_expflag exp_map (map pair_fst (bagToList mod_names)), empty) - - pair_fst p@(f,_) = (f,p) - lub_expflag (n, flag1) (_, flag2) = (n, lubExportFlag flag1 flag2) - - -- Check for exporting of duplicate local names - exp_locals = [(getLocalName n, n) | (n,_) <- eltsUFM exp_map1] - (_, dup_locals) = removeDups cmp_local exp_locals - cmp_local (x,_) (y,_) = x `cmpPString` y - - -- Build export flag function - exp_fn n = case lookupUFM exp_map1 n of - Nothing -> NotExported - Just (_,flag) -> flag - in - getSrcLocRn `thenRn` \ src_loc -> - mapRn (addWarnRn . dupNameExportWarn src_loc) dup_names `thenRn_` - mapRn (addWarnRn . dupModExportWarn src_loc) dup_mods `thenRn_` - mapRn (addWarnRn . emptyModExportWarn src_loc) empty_mods `thenRn_` - mapRn (addErrRn . dupLocalsExportErr src_loc) dup_locals `thenRn_` - returnRn exp_fn - - -rnIE mods (IEVar name) - = lookupValue name `thenRn` \ rn -> - checkIEVar rn `thenRn` \ exps -> - returnRn (Nothing, exps) - where - checkIEVar (RnName n) = returnRn (unitBag (n,ExportAll)) - checkIEVar rn@(RnClassOp _ _) = getSrcLocRn `thenRn` \ src_loc -> - failButContinueRn emptyBag (classOpExportErr rn src_loc) - checkIEVar rn = returnRn emptyBag - -rnIE mods (IEThingAbs name) - = lookupTyConOrClass name `thenRn` \ rn -> - checkIEAbs rn `thenRn` \ exps -> - returnRn (Nothing, exps) - where - checkIEAbs (RnSyn n) = returnRn (unitBag (n,ExportAbs)) - checkIEAbs (RnData n _ _) = returnRn (unitBag (n,ExportAbs)) - checkIEAbs (RnClass n _) = returnRn (unitBag (n,ExportAbs)) - checkIEAbs rn = returnRn 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 (exp_all n `consBag` listToBag (map exp_all cons) - `unionBags` listToBag (map exp_all fields)) - checkIEAll (RnClass n ops) = returnRn (exp_all n `consBag` listToBag (map exp_all ops)) - checkIEAll rn@(RnSyn _) = getSrcLocRn `thenRn` \ src_loc -> - warnAndContinueRn emptyBag (synAllExportErr rn src_loc) - checkIEAll rn = returnRn 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 (consBag (exp_all n) (listToBag (map exp_all cons))) - | otherwise - = rnWithErr "constructrs (and fields)" rn (cons++fields) rns - checkIEWith rn@(RnClass n ops) rns - | same_names ops rns - = returnRn (consBag (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 (synAllExportErr rn src_loc) - checkIEWith rn rns - = returnRn 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 (withExportErr str rn has rns src_loc) - -rnIE mods (IEModuleContents mod) - | isIn "rnIE:IEModule" mod mods - = returnRn (Just mod, emptyBag) - | otherwise - = getSrcLocRn `thenRn` \ src_loc -> - failButContinueRn (Nothing,emptyBag) (badModExportErr mod src_loc) - -checkImportAll rn - = case nameImportFlag (getName rn) of - ExportAll -> returnRn () - exp -> getSrcLocRn `thenRn` \ src_loc -> - addErrRn (importAllErr rn src_loc) +rnDecl (SigD (IfaceSig name ty id_infos loc)) + = pushSrcLocRn loc $ + lookupBndrRn name `thenRn` \ name' -> + rnHsType doc_str ty `thenRn` \ (ty',fvs1) -> + mapFvRn rnIdInfo id_infos `thenRn` \ (id_infos', fvs2) -> + returnRn (SigD (IfaceSig name' ty' id_infos' loc), fvs1 `plusFV` fvs2) + where + doc_str = text "the interface signature for" <+> quotes (ppr name) \end{code} %********************************************************* @@ -265,456 +132,777 @@ 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 - -rnTyDecl (TyData context tycon tyvars condecls derivings pragmas src_loc) +rnDecl (TyClD (TyData new_or_data 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 context `thenRn` \ context' -> - rnConDecls tv_env condecls `thenRn` \ condecls' -> - rn_derivs tycon' src_loc derivings `thenRn` \ derivings' -> + lookupBndrRn tycon `thenRn` \ tycon' -> + bindTyVarsFVRn data_doc tyvars $ \ tyvars' -> + rnContext data_doc context `thenRn` \ (context', cxt_fvs) -> + checkDupOrQualNames data_doc con_names `thenRn_` + mapFvRn rnConDecl condecls `thenRn` \ (condecls', con_fvs) -> + rnDerivs derivings `thenRn` \ (derivings', deriv_fvs) -> ASSERT(isNoDataPragmas pragmas) - returnRn (TyData context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc) + returnRn (TyClD (TyData new_or_data context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc), + cxt_fvs `plusFV` con_fvs `plusFV` deriv_fvs) + where + data_doc = text "the data type declaration for" <+> quotes (ppr tycon) + con_names = map conDeclName condecls -rnTyDecl (TyNew context tycon tyvars condecl derivings pragmas src_loc) +rnDecl (TyClD (TySynonym name tyvars ty src_loc)) = pushSrcLocRn src_loc $ - lookupTyCon tycon `thenRn` \ tycon' -> - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env, tyvars') -> - rnContext tv_env 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) + lookupBndrRn name `thenRn` \ name' -> + bindTyVarsFVRn syn_doc tyvars $ \ tyvars' -> + rnHsType syn_doc ty `thenRn` \ (ty', ty_fvs) -> + returnRn (TyClD (TySynonym name' tyvars' ty' src_loc), ty_fvs) + where + syn_doc = text "the declaration for type synonym" <+> quotes (ppr name) -rnTyDecl (TySynonym name tyvars ty src_loc) +rnDecl (TyClD (ClassDecl context cname tyvars sigs mbinds pragmas tname dname snames src_loc)) = pushSrcLocRn src_loc $ - lookupTyCon name `thenRn` \ name' -> - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env, tyvars') -> - rnMonoType tv_env ty `thenRn` \ ty' -> - returnRn (TySynonym name' tyvars' ty' src_loc) -rn_derivs tycon2 locn Nothing -- derivs not specified - = returnRn Nothing + lookupBndrRn cname `thenRn` \ cname' -> -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 locn) - `thenRn_` - returnRn clas_name - where - not_elem = isn'tIn "rn_deriv" -\end{code} + -- 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! + -- So the 'Imported' part of this call is not relevant. + -- Unclean; but since these two are the only place this happens + -- I can't work up the energy to do it more beautifully + mkImportedGlobalFromRdrName tname `thenRn` \ tname' -> + mkImportedGlobalFromRdrName dname `thenRn` \ dname' -> + mapRn mkImportedGlobalFromRdrName snames `thenRn` \ snames' -> -@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. + -- Tyvars scope over bindings and context + bindTyVarsFV2Rn cls_doc tyvars ( \ clas_tyvar_names tyvars' -> -\begin{code} -rnConDecls :: TyVarNamesEnv - -> [RdrNameConDecl] - -> RnM_Fixes s [RenamedConDecl] + -- Check the superclasses + rnContext cls_doc context `thenRn` \ (context', cxt_fvs) -> -rnConDecls tv_env con_decls - = mapRn rn_decl con_decls + -- Check the signatures + let + -- First process the class op sigs, then the fixity sigs. + (op_sigs, non_op_sigs) = partition isClassOpSig sigs + (fix_sigs, non_sigs) = partition isFixitySig non_op_sigs + in + checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_` + mapFvRn (rn_op cname' clas_tyvar_names) op_sigs `thenRn` \ (sigs', sig_fvs) -> + mapRn_ (unknownSigErr) non_sigs `thenRn_` + let + binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ] + in + renameSigs False binders lookupOccRn fix_sigs `thenRn` \ (fixs', fix_fvs) -> + + -- Check the methods + checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_` + rnMethodBinds mbinds `thenRn` \ (mbinds', meth_fvs) -> + + -- 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. + + ASSERT(isNoClassPragmas pragmas) + returnRn (TyClD (ClassDecl context' cname' tyvars' (fixs' ++ sigs') + mbinds' NoClassPragmas tname' dname' snames' src_loc), + sig_fvs `plusFV` + fix_fvs `plusFV` + cxt_fvs `plusFV` + meth_fvs + ) + ) 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) + cls_doc = text "the declaration for class" <+> ppr cname + sig_doc = text "the signatures for class" <+> ppr cname + meth_doc = text "the default-methods for class" <+> ppr cname + + sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs] + meth_rdr_names_w_locs = bagToList (collectMonoBinders mbinds) + meth_rdr_names = map fst meth_rdr_names_w_locs + + rn_op clas clas_tyvars sig@(ClassOpSig op maybe_dm ty locn) + = pushSrcLocRn locn $ + lookupBndrRn op `thenRn` \ op_name -> + + -- Check the signature + rnHsSigType (quotes (ppr op)) ty `thenRn` \ (new_ty, op_ty_fvs) -> + let + check_in_op_ty clas_tyvar = checkRn (clas_tyvar `elemNameSet` op_ty_fvs) + (classTyVarNotInOpTyErr clas_tyvar sig) + in + mapRn_ check_in_op_ty clas_tyvars `thenRn_` + + -- Make the default-method name + getModeRn `thenRn` \ mode -> + (case (mode, maybe_dm) of + (SourceMode, _) + | op `elem` meth_rdr_names + -> -- Source class decl with an explicit method decl + newImplicitBinder (mkDefaultMethodOcc (rdrNameOcc op)) locn `thenRn` \ dm_name -> + returnRn (Just dm_name, emptyFVs) + + | otherwise + -> -- Source class dec, no explicit method decl + returnRn (Nothing, emptyFVs) + + (InterfaceMode, Just dm_rdr_name) + -> -- Imported class that has a default method decl + -- See comments with tname, snames, above + lookupImplicitOccRn dm_rdr_name `thenRn` \ dm_name -> + returnRn (Just dm_name, unitFV dm_name) + -- An imported class decl mentions, rather than defines, + -- the default method, so we must arrange to pull it in + + (InterfaceMode, Nothing) + -- Imported class with no default metho + -> returnRn (Nothing, emptyFVs) + ) `thenRn` \ (maybe_dm_name, dm_fvs) -> + + returnRn (ClassOpSig op_name maybe_dm_name new_ty locn, op_ty_fvs `plusFV` dm_fvs) \end{code} + %********************************************************* -%* * -\subsection{SPECIALIZE data pragmas} -%* * +%* * +\subsection{Instance declarations} +%* * %********************************************************* \begin{code} -rnSpecDataSig :: RdrNameSpecDataSig - -> RnM_Fixes s RenamedSpecDataSig - -rnSpecDataSig (SpecDataSig tycon ty src_loc) +rnDecl (InstD (InstDecl inst_ty mbinds uprags dfun_rdr_name src_loc)) = pushSrcLocRn src_loc $ + rnHsSigType (text "an instance decl") inst_ty `thenRn` \ (inst_ty', inst_fvs) -> let - tyvars = extractMonoTyNames is_tyvar_name ty + 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 - 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) + -- Rename the bindings + -- NB meth_names can be qualified! + checkDupNames meth_doc meth_names `thenRn_` + extendTyVarEnvFVRn inst_tyvars ( + rnMethodBinds mbinds + ) `thenRn` \ (mbinds', meth_fvs) -> + let + binders = mkNameSet (map fst (bagToList (collectMonoBinders mbinds'))) + + -- Delete sigs (&report) sigs that aren't allowed inside an + -- instance decl: + -- + -- + type signatures + -- + fixity decls + -- + (ok_sigs, not_ok_idecl_sigs) = partition okInInstDecl uprags + + okInInstDecl (FixSig _) = False + okInInstDecl (Sig _ _ _) = False + okInInstDecl _ = True + + in + -- You can't have fixity decls & type signatures + -- within an instance declaration. + mapRn_ unknownSigErr not_ok_idecl_sigs `thenRn_` + + -- 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. + renameSigs False binders lookupOccRn ok_sigs `thenRn` \ (new_uprags, prag_fvs) -> + + getModeRn `thenRn` \ mode -> + (case mode of + InterfaceMode -> lookupImplicitOccRn dfun_rdr_name `thenRn` \ dfun_name -> + returnRn (dfun_name, unitFV dfun_name) + SourceMode -> newDFunName (getDFunKey inst_ty') src_loc `thenRn` \ dfun_name -> + returnRn (dfun_name, emptyFVs) + ) `thenRn` \ (dfun_name, dfun_fv) -> + + -- The typechecker checks that all the bindings are for the right class. + returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags dfun_name src_loc), + inst_fvs `plusFV` meth_fvs `plusFV` prag_fvs `plusFV` dfun_fv) + where + meth_doc = text "the bindings in an instance declaration" + meth_names = bagToList (collectMonoBinders mbinds) \end{code} %********************************************************* %* * -\subsection{Class declarations} +\subsection{Default declarations} %* * %********************************************************* -@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. - \begin{code} -rnClassDecl :: RdrNameClassDecl -> RnM_Fixes s RenamedClassDecl - -rnClassDecl (ClassDecl context cname tyvar sigs mbinds pragmas src_loc) +rnDecl (DefD (DefaultDecl tys src_loc)) = pushSrcLocRn src_loc $ - mkTyVarNamesEnv src_loc [tyvar] `thenRn` \ (tv_env, [tyvar']) -> - rnContext tv_env context `thenRn` \ context' -> - lookupClass cname `thenRn` \ cname' -> - mapRn (rn_op cname' tv_env) sigs `thenRn` \ sigs' -> - rnMethodBinds cname' mbinds `thenRn` \ mbinds' -> - ASSERT(isNoClassPragmas pragmas) - returnRn (ClassDecl context' cname' tyvar' sigs' mbinds' NoClassPragmas src_loc) + rnHsTypes doc_str tys `thenRn` \ (tys', fvs) -> + lookupImplicitOccRn numClass_RDR `thenRn` \ num -> + returnRn (DefD (DefaultDecl tys' src_loc), fvs `addOneFV` num) where - rn_op clas tv_env (ClassOpSig op ty pragmas locn) - = pushSrcLocRn locn $ - lookupClassOp clas op `thenRn` \ op_name -> - rnPolyType tv_env ty `thenRn` \ new_ty -> - -{- -*** Please check here that tyvar' appears in new_ty *** -*** (used to be in tcClassSig, but it's better here) -*** not_elem = isn'tIn "tcClassSigs" -*** -- Check that the class type variable is mentioned -*** checkTc (clas_tyvar `not_elem` extractTyVarTemplatesFromTy local_ty) -*** (methodTypeLacksTyVarErr clas_tyvar (_UNPK_ op_name) src_loc) `thenTc_` --} - - ASSERT(isNoClassOpPragmas pragmas) - returnRn (ClassOpSig op_name new_ty noClassOpPragmas locn) + doc_str = text "a `default' declaration" \end{code} - %********************************************************* %* * -\subsection{Instance declarations} +\subsection{Foreign declarations} %* * %********************************************************* +\begin{code} +rnDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc)) + = pushSrcLocRn src_loc $ + lookupBndrRn name `thenRn` \ name' -> + let + fvs1 = case imp_exp of + FoImport _ | not isDyn -> emptyFVs + FoLabel -> emptyFVs + FoExport | isDyn -> mkNameSet [makeStablePtr_NAME, + deRefStablePtr_NAME, + bindIO_NAME] + _ -> emptyFVs + in + rnHsSigType 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("a foreign declaration") + isDyn = isDynamic ext_nm +\end{code} -@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. +%********************************************************* +%* * +\subsection{Rules} +%* * +%********************************************************* \begin{code} -rnInstDecl :: RdrNameInstDecl -> RnM_Fixes s RenamedInstDecl +rnDecl (RuleD (IfaceRuleDecl var body src_loc)) + = pushSrcLocRn src_loc $ + lookupOccRn var `thenRn` \ var' -> + rnRuleBody body `thenRn` \ (body', fvs) -> + returnRn (RuleD (IfaceRuleDecl var' body' src_loc), fvs `addOneFV` var') + +rnDecl (RuleD (RuleDecl 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 (RuleD (RuleDecl 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) = rnHsType doc t `thenRn` \ (t', fvs) -> + returnRn (RuleBndrSig id t', fvs) +\end{code} -rnInstDecl (InstDecl cname ty mbinds from_here modname uprags pragmas src_loc) - = pushSrcLocRn src_loc $ - lookupClass cname `thenRn` \ cname' -> - rnPolyType [] ty `thenRn` \ ty' -> - -- [] tv_env ensures that tyvars will be foralled +%********************************************************* +%* * +\subsection{Support code for type/data declarations} +%* * +%********************************************************* + +\begin{code} +rnDerivs :: Maybe [RdrName] -> RnMS (Maybe [Name], FreeVars) - rnMethodBinds cname' mbinds `thenRn` \ mbinds' -> - mapRn (rn_uprag cname') uprags `thenRn` \ new_uprags -> +rnDerivs Nothing -- derivs not specified + = returnRn (Nothing, emptyFVs) - ASSERT(isNoInstancePragmas pragmas) - returnRn (InstDecl cname' ty' mbinds' - from_here modname new_uprags noInstancePragmas src_loc) +rnDerivs (Just ds) + = mapFvRn rn_deriv ds `thenRn` \ (derivs, fvs) -> + returnRn (Just derivs, fvs) 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_deriv clas + = lookupOccRn clas `thenRn` \ clas_name -> + + -- Now add extra "occurrences" for things that + -- the deriving mechanism will later need in order to + -- generate code for this class. + case lookupUFM derivingOccurrences clas_name of + Nothing -> addErrRn (derivingNonStdClassErr clas_name) `thenRn_` + returnRn (clas_name, unitFV clas_name) + + Just occs -> mapRn lookupImplicitOccRn occs `thenRn` \ names -> + returnRn (clas_name, mkNameSet (clas_name : names)) +\end{code} - rn_uprag class_name (DeforestSig op locn) - = pushSrcLocRn locn $ - lookupClassOp class_name op `thenRn` \ op_name -> - returnRn (DeforestSig op_name locn) +\begin{code} +conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc) +conDeclName (ConDecl n _ _ _ l) = (n,l) + +rnConDecl :: RdrNameConDecl -> RnMS (RenamedConDecl, FreeVars) +rnConDecl (ConDecl name tvs cxt details locn) + = pushSrcLocRn locn $ + checkConName name `thenRn_` + lookupBndrRn name `thenRn` \ new_name -> + bindTyVarsFVRn doc tvs $ \ new_tyvars -> + rnContext doc cxt `thenRn` \ (new_context, cxt_fvs) -> + rnConDetails doc locn details `thenRn` \ (new_details, det_fvs) -> + returnRn (ConDecl new_name new_tyvars new_context new_details locn, + cxt_fvs `plusFV` det_fvs) + where + doc = text "the definition of data constructor" <+> quotes (ppr name) - 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) +rnConDetails doc locn (VanillaCon tys) + = mapFvRn (rnBangTy doc) tys `thenRn` \ (new_tys, fvs) -> + returnRn (VanillaCon new_tys, fvs) + +rnConDetails doc locn (InfixCon ty1 ty2) + = rnBangTy doc ty1 `thenRn` \ (new_ty1, fvs1) -> + rnBangTy doc ty2 `thenRn` \ (new_ty2, fvs2) -> + returnRn (InfixCon new_ty1 new_ty2, fvs1 `plusFV` fvs2) + +rnConDetails doc locn (NewCon ty mb_field) + = rnHsType doc ty `thenRn` \ (new_ty, fvs) -> + rn_field mb_field `thenRn` \ new_mb_field -> + returnRn (NewCon new_ty new_mb_field, fvs) + where + rn_field Nothing = returnRn Nothing + rn_field (Just f) = + lookupBndrRn f `thenRn` \ new_f -> + returnRn (Just new_f) + +rnConDetails doc locn (RecCon fields) + = checkDupOrQualNames doc field_names `thenRn_` + mapFvRn (rnField doc) fields `thenRn` \ (new_fields, fvs) -> + returnRn (RecCon new_fields, fvs) + where + field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds] + +rnField doc (names, ty) + = mapRn lookupBndrRn names `thenRn` \ new_names -> + rnBangTy doc ty `thenRn` \ (new_ty, fvs) -> + returnRn ((new_names, new_ty), fvs) + +rnBangTy doc (Banged ty) + = rnHsType doc ty `thenRn` \ (new_ty, fvs) -> + returnRn (Banged new_ty, fvs) + +rnBangTy doc (Unbanged ty) + = rnHsType doc ty `thenRn` \ (new_ty, fvs) -> + returnRn (Unbanged new_ty, fvs) + +rnBangTy doc (Unpacked ty) + = rnHsType doc ty `thenRn` \ (new_ty, fvs) -> + returnRn (Unpacked new_ty, fvs) + +-- 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 $ +rnHsSigType :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars) + -- 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 + +rnForAll doc forall_tyvars ctxt ty + = bindTyVarsFVRn doc forall_tyvars $ \ new_tyvars -> + rnContext doc ctxt `thenRn` \ (new_ctxt, cxt_fvs) -> + rnHsType doc ty `thenRn` \ (new_ty, ty_fvs) -> + returnRn (mkHsForAllTy new_tyvars new_ctxt new_ty, + cxt_fvs `plusFV` ty_fvs) + +-- Check that each constraint mentions at least one of the forall'd type variables +-- Since the forall'd type variables are a subset of the free tyvars +-- of the tau-type part, this guarantees that every constraint mentions +-- at least one of the free tyvars in ty +checkConstraints explicit_forall doc forall_tyvars ctxt ty + = mapRn check ctxt `thenRn` \ maybe_ctxt' -> + returnRn (catMaybes maybe_ctxt') + -- Remove problem ones, to avoid duplicate error message. + where + check ct@(_,tys) + | forall_mentioned = returnRn (Just ct) + | otherwise = addErrRn (ctxtErr explicit_forall doc forall_tyvars ct ty) `thenRn_` + returnRn Nothing + where + forall_mentioned = foldr ((||) . any (`elem` forall_tyvars) . extractHsTyRdrNames) + False + tys + +freeRdrTyVars :: RdrNameHsType -> [RdrName] +freeRdrTyVars ty = filter isRdrTyVar (extractHsTyRdrNames ty) + +rnHsType :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars) + +rnHsType doc (HsForAllTy Nothing ctxt ty) + -- From 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 = freeRdrTyVars ty + forall_tyvars = filter (not . (`elemFM` name_env)) mentioned_in_tau 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} + checkConstraints False doc forall_tyvars ctxt ty `thenRn` \ ctxt' -> + rnForAll doc (map UserTyVar forall_tyvars) ctxt' ty + +rnHsType doc (HsForAllTy (Just forall_tyvars) ctxt tau) + -- Explicit quantification. + -- Check that the forall'd tyvars are a subset of the + -- free tyvars in the tau-type part + -- That's only a warning... unless the tyvar is constrained by a + -- context in which case it's an error + = let + mentioned_in_tau = freeRdrTyVars tau + mentioned_in_ctxt = nub [tv | (_,tys) <- ctxt, + ty <- tys, + tv <- freeRdrTyVars ty] + + dubious_guys = filter (`notElem` mentioned_in_tau) forall_tyvar_names + -- dubious = explicitly quantified but not mentioned in tau type + + (bad_guys, warn_guys) = partition (`elem` mentioned_in_ctxt) dubious_guys + -- bad = explicitly quantified and constrained, but not mentioned in tau + -- warn = explicitly quantified but not mentioned in ctxt or tau + + forall_tyvar_names = map getTyVarName forall_tyvars + in + mapRn_ (forAllErr doc tau) bad_guys `thenRn_` + mapRn_ (forAllWarn doc tau) warn_guys `thenRn_` + checkConstraints True doc forall_tyvar_names ctxt tau `thenRn` \ ctxt' -> + rnForAll doc forall_tyvars ctxt' tau + +rnHsType doc (MonoTyVar tyvar) + = lookupOccRn tyvar `thenRn` \ tyvar' -> + returnRn (MonoTyVar tyvar', unitFV tyvar') + +rnHsType doc (MonoFunTy ty1 ty2) + = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) -> + rnHsType doc ty2 `thenRn` \ (ty2', fvs2) -> + returnRn (MonoFunTy ty1' ty2', fvs1 `plusFV` fvs2) + +rnHsType doc (MonoListTy ty) + = rnHsType doc ty `thenRn` \ (ty', fvs) -> + returnRn (MonoListTy ty', fvs `addOneFV` listTyCon_name) + +rnHsType doc (MonoTupleTy tys boxed) + = rnHsTypes doc tys `thenRn` \ (tys', fvs) -> + returnRn (MonoTupleTy tys' boxed, fvs `addOneFV` tup_con_name) + where + tup_con_name = tupleTyCon_name boxed (length tys) -%********************************************************* -%* * -\subsection{Default declarations} -%* * -%********************************************************* +rnHsType doc (MonoTyApp ty1 ty2) + = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) -> + rnHsType doc ty2 `thenRn` \ (ty2', fvs2) -> + returnRn (MonoTyApp ty1' ty2', fvs1 `plusFV` fvs2) -@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 (MonoDictTy clas tys) + = lookupOccRn clas `thenRn` \ clas' -> + rnHsTypes doc tys `thenRn` \ (tys', fvs) -> + returnRn (MonoDictTy clas' tys', fvs `addOneFV` clas') -\begin{code} -rnDefaultDecl :: [RdrNameDefaultDecl] -> RnM_Fixes s [RenamedDefaultDecl] +rnHsType doc (MonoUsgTy usg ty) + = rnHsType doc ty `thenRn` \ (ty', fvs) -> + returnRn (MonoUsgTy usg ty', fvs) -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 = mapFvRn (rnHsType doc) tys \end{code} -%************************************************************************* -%* * -\subsection{Fixity declarations} -%* * -%************************************************************************* \begin{code} -rnFixes :: [RdrNameFixityDecl] -> RnM s [RenamedFixityDecl] +rnContext :: SDoc -> RdrNameContext -> RnMS (RenamedContext, FreeVars) -rnFixes fixities - = getSrcLocRn `thenRn` \ src_loc -> +rnContext doc ctxt + = mapAndUnzipRn rn_ctxt ctxt `thenRn` \ (theta, fvs_s) -> let - (_, dup_fixes) = removeDups cmp_fix fixities - cmp_fix fix1 fix2 = nameFixDecl fix1 `cmp` nameFixDecl 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 - -> returnRn (Just (mk_fixity res i)) - _ -> failButContinueRn Nothing (undefinedFixityDeclErr src_loc fix) + (_, dup_asserts) = removeDups cmp_assert theta 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) dup_asserts `thenRn_` -nameFixDecl (InfixL name i) = name -nameFixDecl (InfixR name i) = name -nameFixDecl (InfixN name i) = name + returnRn (theta, plusFVs fvs_s) + where + rn_ctxt (clas, tys) + = lookupOccRn clas `thenRn` \ clas_name -> + rnHsTypes doc tys `thenRn` \ (tys', fvs) -> + returnRn ((clas_name, tys'), fvs `addOneFV` clas_name) + + cmp_assert (c1,tys1) (c2,tys2) + = (c1 `compare` c2) `thenCmp` (cmpHsTypes compare tys1 tys2) \end{code} + %********************************************************* %* * -\subsection{Support code to rename types} +\subsection{IdInfo} %* * %********************************************************* \begin{code} -rnPolyType :: TyVarNamesEnv - -> RdrNamePolyType - -> RnM_Fixes s RenamedPolyType +rnIdInfo (HsStrictness str) = returnRn (HsStrictness str, emptyFVs) + +rnIdInfo (HsWorker worker) + = lookupOccRn worker `thenRn` \ worker' -> + returnRn (HsWorker worker', unitFV worker') + +rnIdInfo (HsUnfold inline (Just expr)) = rnCoreExpr expr `thenRn` \ (expr', fvs) -> + returnRn (HsUnfold inline (Just expr'), fvs) +rnIdInfo (HsUnfold inline Nothing) = returnRn (HsUnfold inline Nothing, emptyFVs) +rnIdInfo (HsArity arity) = returnRn (HsArity arity, emptyFVs) +rnIdInfo (HsUpdate update) = returnRn (HsUpdate update, emptyFVs) +rnIdInfo (HsNoCafRefs) = returnRn (HsNoCafRefs, emptyFVs) +rnIdInfo (HsCprInfo cpr_info) = returnRn (HsCprInfo cpr_info, emptyFVs) +rnIdInfo (HsSpecialise rule_body) = rnRuleBody rule_body `thenRn` \ (rule_body', fvs) -> + returnRn (HsSpecialise rule_body', fvs) + +rnRuleBody (UfRuleBody str vars args rhs) + = rnCoreBndrs vars $ \ vars' -> + mapFvRn rnCoreExpr args `thenRn` \ (args', fvs1) -> + rnCoreExpr rhs `thenRn` \ (rhs', fvs2) -> + returnRn (UfRuleBody str vars' args' rhs', fvs1 `plusFV` fvs2) +\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', fvs) -> + returnRn (UfType ty', fvs) + +rnCoreExpr (UfVar v) + = lookupOccRn v `thenRn` \ v' -> + returnRn (UfVar v', unitFV v') + +rnCoreExpr (UfCon con args) + = rnUfCon con `thenRn` \ (con', fvs1) -> + mapFvRn rnCoreExpr args `thenRn` \ (args', fvs2) -> + returnRn (UfCon con' args', fvs1 `plusFV` fvs2) + +rnCoreExpr (UfTuple con args) + = lookupOccRn con `thenRn` \ con' -> + mapFvRn rnCoreExpr args `thenRn` \ (args', fvs) -> + returnRn (UfTuple con' args', fvs `addOneFV` con') + +rnCoreExpr (UfApp fun arg) + = rnCoreExpr fun `thenRn` \ (fun', fv1) -> + rnCoreExpr arg `thenRn` \ (arg', fv2) -> + returnRn (UfApp fun' arg', fv1 `plusFV` fv2) + +rnCoreExpr (UfCase scrut bndr alts) + = rnCoreExpr scrut `thenRn` \ (scrut', fvs1) -> + bindCoreLocalFVRn bndr ( \ bndr' -> + mapFvRn rnCoreAlt alts `thenRn` \ (alts', fvs2) -> + returnRn (UfCase scrut' bndr' alts', fvs2) + ) `thenRn` \ (case', fvs3) -> + returnRn (case', fvs1 `plusFV` fvs3) + +rnCoreExpr (UfNote note expr) + = rnNote note `thenRn` \ (note', fvs1) -> + rnCoreExpr expr `thenRn` \ (expr', fvs2) -> + returnRn (UfNote note' expr', fvs1 `plusFV` fvs2) + +rnCoreExpr (UfLam bndr body) + = rnCoreBndr bndr $ \ bndr' -> + rnCoreExpr body `thenRn` \ (body', fvs) -> + returnRn (UfLam bndr' body', fvs) + +rnCoreExpr (UfLet (UfNonRec bndr rhs) body) + = rnCoreExpr rhs `thenRn` \ (rhs', fvs1) -> + rnCoreBndr bndr ( \ bndr' -> + rnCoreExpr body `thenRn` \ (body', fvs2) -> + returnRn (UfLet (UfNonRec bndr' rhs') body', fvs2) + ) `thenRn` \ (result, fvs3) -> + returnRn (result, fvs1 `plusFV` fvs3) + +rnCoreExpr (UfLet (UfRec pairs) body) + = rnCoreBndrs bndrs $ \ bndrs' -> + mapFvRn rnCoreExpr rhss `thenRn` \ (rhss', fvs1) -> + rnCoreExpr body `thenRn` \ (body', fvs2) -> + returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body', fvs1 `plusFV` fvs2) 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 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', fvs1) -> + bindCoreLocalFVRn name ( \ name' -> + thing_inside (UfValBinder name' ty') + ) `thenRn` \ (result, fvs2) -> + returnRn (result, fvs1 `plusFV` fvs2) + where + doc = text "unfolding id" + +rnCoreBndr (UfTyBinder name kind) thing_inside + = bindCoreLocalFVRn 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 `thenRn` \ (con', fvs1) -> + bindCoreLocalsFVRn bndrs ( \ bndrs' -> + rnCoreExpr rhs `thenRn` \ (rhs', fvs2) -> + returnRn ((con', bndrs', rhs'), fvs2) + ) `thenRn` \ (result, fvs3) -> + returnRn (result, fvs1 `plusFV` fvs3) -rnMonoType tv_env (MonoListTy ty) - = rnMonoType tv_env ty `thenRn` \ ty' -> - returnRn (MonoListTy ty') +rnNote (UfCoerce ty) + = rnHsType (text "unfolding coerce") ty `thenRn` \ (ty', fvs) -> + returnRn (UfCoerce ty', fvs) -rnMonoType tv_env (MonoFunTy ty1 ty2) - = andRn MonoFunTy (rnMonoType tv_env ty1) - (rnMonoType tv_env ty2) +rnNote (UfSCC cc) = returnRn (UfSCC cc, emptyFVs) +rnNote UfInlineCall = returnRn (UfInlineCall, emptyFVs) +rnNote UfInlineMe = returnRn (UfInlineMe, emptyFVs) -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, emptyFVs) -\begin{code} -rnContext :: TyVarNamesEnv -> RdrNameContext -> RnM_Fixes s RenamedContext +rnUfCon (UfDataCon con) + = lookupOccRn con `thenRn` \ con' -> + returnRn (UfDataCon con', unitFV con') -rnContext tv_env ctxt - = mapRn rn_ctxt ctxt - where - rn_ctxt (clas, tyvar) - = lookupClass clas `thenRn` \ clas_name -> - lookupTyVarName tv_env tyvar `thenRn` \ tyvar_name -> - returnRn (clas_name, tyvar_name) +rnUfCon (UfLitCon lit) + = returnRn (UfLitCon lit, emptyFVs) + +rnUfCon (UfLitLitCon lit ty) + = rnHsType (text "litlit") ty `thenRn` \ (ty', fvs) -> + returnRn (UfLitLitCon lit ty', fvs) + +rnUfCon (UfPrimOp op) + = lookupOccRn op `thenRn` \ op' -> + returnRn (UfPrimOp op', emptyFVs) + +rnUfCon (UfCCallOp str is_dyn casm gc) + = returnRn (UfCCallOp str is_dyn casm gc, emptyFVs) \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,_):_) - = addShortErrLocLine 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 class"]) - -synAllExportErr syn locn - = addShortErrLocLine 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:", ppPStr mod]) - -dupModExportWarn locn mods@(mod:_) - = addShortErrLocLine locn (\ sty -> - ppCat [ppStr "module", ppPStr mod, ppStr "appears", ppInt (length mods), ppStr "times in export list"]) - -emptyModExportWarn locn mod - = addShortErrLocLine locn (\ sty -> - ppCat [ppStr "module", ppPStr mod, ppStr "has no unqualified imports to export"]) - -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 + check (HsApp e1 e2) = check e1 + check (HsVar v) | v `notElem` foralls = True + check other = False +\end{code} - 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) +%********************************************************* +%* * +\subsection{Errors} +%* * +%********************************************************* -dupFixityDeclErr locn dups - = addErrLoc locn "multiple fixity declarations for same operator" (\ sty -> - ppAboves (map (ppr sty) dups)) +\begin{code} +derivingNonStdClassErr clas + = hsep [ptext SLIT("non-standard class"), ppr clas, ptext SLIT("in deriving clause")] + +classTyVarNotInOpTyErr clas_tyvar sig + = hang (hsep [ptext SLIT("Class type variable"), + quotes (ppr clas_tyvar), + ptext SLIT("does not appear in method signature")]) + 4 (ppr sig) + +dupClassAssertWarn ctxt (assertion : dups) + = sep [hsep [ptext SLIT("Duplicate class assertion"), + quotes (pprClassAssertion assertion), + ptext SLIT("in the context:")], + nest 4 (pprContext ctxt <+> ptext SLIT("..."))] + +badDataCon name + = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)] + +forAllWarn doc ty tyvar + | not opt_WarnUnusedMatches = 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))] + $$ + (ptext SLIT("In") <+> doc)) + } + +forAllErr doc ty tyvar + = addErrRn ( + sep [ptext SLIT("The constrained type variable") <+> quotes (ppr tyvar), + nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))] + $$ + (ptext SLIT("In") <+> doc)) + +ctxtErr explicit_forall doc tyvars constraint ty + = sep [ptext SLIT("None of the type variable(s) in the constraint") <+> quotes (pprClassAssertion constraint), + if explicit_forall then + nest 4 (ptext SLIT("is universally quantified (i.e. bound by the forall)")) + else + nest 4 (ptext SLIT("appears 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")] \end{code}