X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnSource.lhs;h=6ee9f8a7dd9c7afebb534daf299726289b0a153c;hb=845db8182942e006a9164e41e9839adb39f24268;hp=2d608011fae6960cb124e3b33ea5839cb10d7647;hpb=a77abe6a30ea2763cfa1c0ca83cdce9b7200ced2;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnSource.lhs b/ghc/compiler/rename/RnSource.lhs index 2d60801..6ee9f8a 100644 --- a/ghc/compiler/rename/RnSource.lhs +++ b/ghc/compiler/rename/RnSource.lhs @@ -1,431 +1,319 @@ % -% (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 ( + rnSrcDecls, addTcgDUs, + rnTyClDecls, checkModDeprec, + rnBindGroups, rnBindGroupsAndThen, rnSplice + ) where -import Ubiq -import RnLoop -- *check* the RnPass/RnExpr/RnBinds loop-breaking +#include "HsVersions.h" import HsSyn -import HsPragmas -import RdrHsSyn +import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, elemLocalRdrEnv ) +import RdrHsSyn ( extractGenericPatTyVars ) import RnHsSyn -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 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 RnExpr ( rnLExpr, checkTH ) +import RnTypes ( rnLHsType, rnLHsTypes, rnHsSigType, rnHsTypeFVs, rnContext ) +import RnBinds ( rnTopBinds, rnBinds, rnMethodBinds, + rnBindsAndThen, renameSigs, checkSigs ) +import RnEnv ( lookupTopBndrRn, lookupTopFixSigNames, + lookupLocatedTopBndrRn, lookupLocatedOccRn, + lookupOccRn, newLocalsRn, + bindLocatedLocalsFV, bindPatSigTyVarsFV, + bindTyVarsRn, extendTyVarEnvFVRn, + bindLocalNames, newIPNameRn, + checkDupNames, mapFvRn, + unknownNameErr + ) +import TcRnMonad + +import BasicTypes ( TopLevelFlag(..) ) +import HscTypes ( FixityEnv, FixItem(..), + Deprecations, Deprecs(..), DeprecTxt, plusDeprecs ) +import Class ( FunDep ) +import Name ( Name, nameOccName ) +import NameSet +import NameEnv +import Outputable +import SrcLoc ( Located(..), unLoc, getLoc, noLoc ) +import CmdLineOpts ( DynFlag(..) ) + -- Warn of unused for-all'd tyvars +import Maybes ( seqMaybe ) +import Maybe ( catMaybes, isNothing ) \end{code} -rnSource `renames' the source module and export list. +@rnSourceDecl@ `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} \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 $ - - rnExports (mod:imp_mods) unqual_imps exports `thenRn` \ exported_fn -> - rnFixes fixes `thenRn` \ src_fixes -> - let - pair_name inf = (nameFixDecl inf, inf) - - 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 - ) - where - trashed_exports = {-trace "rnSource:trashed_exports"-} Nothing - trashed_imports = {-trace "rnSource:trashed_imports"-} [] +rnSrcDecls :: HsGroup RdrName -> RnM (TcGblEnv, HsGroup Name) + +rnSrcDecls (HsGroup { hs_valds = [HsBindGroup binds sigs _], + hs_tyclds = tycl_decls, + hs_instds = inst_decls, + hs_fixds = fix_decls, + hs_depds = deprec_decls, + hs_fords = foreign_decls, + hs_defds = default_decls, + hs_ruleds = rule_decls }) + + = do { -- Deal with deprecations (returns only the extra deprecations) + deprecs <- rnSrcDeprecDecls deprec_decls ; + updGblEnv (\gbl -> gbl { tcg_deprecs = tcg_deprecs gbl `plusDeprecs` deprecs }) + $ do { + + -- Deal with top-level fixity decls + -- (returns the total new fixity env) + fix_env <- rnSrcFixityDecls fix_decls ; + updGblEnv (\gbl -> gbl { tcg_fix_env = fix_env }) + $ do { + + -- Rename other declarations + traceRn (text "Start rnmono") ; + (rn_val_decls, bind_dus) <- rnTopBinds binds sigs ; + traceRn (text "finish rnmono" <+> ppr rn_val_decls) ; + + -- You might think that we could build proper def/use information + -- for type and class declarations, but they can be involved + -- in mutual recursion across modules, and we only do the SCC + -- analysis for them in the type checker. + -- So we content ourselves with gathering uses only; that + -- means we'll only report a declaration as unused if it isn't + -- mentioned at all. Ah well. + (rn_tycl_decls, src_fvs1) + <- mapFvRn (wrapLocFstM rnTyClDecl) tycl_decls ; + (rn_inst_decls, src_fvs2) + <- mapFvRn (wrapLocFstM rnSrcInstDecl) inst_decls ; + (rn_rule_decls, src_fvs3) + <- mapFvRn (wrapLocFstM rnHsRuleDecl) rule_decls ; + (rn_foreign_decls, src_fvs4) + <- mapFvRn (wrapLocFstM rnHsForeignDecl) foreign_decls ; + (rn_default_decls, src_fvs5) + <- mapFvRn (wrapLocFstM rnDefaultDecl) default_decls ; + + let { + rn_group = HsGroup { hs_valds = rn_val_decls, + hs_tyclds = rn_tycl_decls, + hs_instds = rn_inst_decls, + hs_fixds = [], + hs_depds = [], + hs_fords = rn_foreign_decls, + hs_defds = rn_default_decls, + hs_ruleds = rn_rule_decls } ; + + other_fvs = plusFVs [src_fvs1, src_fvs2, src_fvs3, + src_fvs4, src_fvs5] ; + src_dus = bind_dus `plusDU` usesOnly other_fvs + -- Note: src_dus will contain *uses* for locally-defined types + -- and classes, but no *defs* for them. (Because rnTyClDecl + -- returns only the uses.) This is a little + -- surprising but it doesn't actually matter at all. + } ; + + traceRn (text "finish rnSrc" <+> ppr rn_group) ; + traceRn (text "finish Dus" <+> ppr src_dus ) ; + tcg_env <- getGblEnv ; + return (tcg_env `addTcgDUs` src_dus, rn_group) + }}} + +rnTyClDecls :: [LTyClDecl RdrName] -> RnM [LTyClDecl Name] +rnTyClDecls tycl_decls = do + (decls', fvs) <- mapFvRn (wrapLocFstM rnTyClDecl) tycl_decls + return decls' + +addTcgDUs :: TcGblEnv -> DefUses -> TcGblEnv +addTcgDUs tcg_env dus = tcg_env { tcg_dus = tcg_dus tcg_env `plusDU` dus } \end{code} %********************************************************* -%* * -\subsection{Export list} -%* * +%* * + Source-code fixity declarations +%* * %********************************************************* \begin{code} -rnExports :: [Module] - -> Bag (Module,RnName) - -> Maybe [RdrNameIE] - -> RnM s (Name -> ExportFlag) +rnSrcFixityDecls :: [LFixitySig RdrName] -> RnM FixityEnv +rnSrcFixityDecls fix_decls + = getGblEnv `thenM` \ gbl_env -> + foldlM rnFixityDecl (tcg_fix_env gbl_env) + fix_decls `thenM` \ fix_env -> + traceRn (text "fixity env" <+> pprFixEnv fix_env) `thenM_` + returnM fix_env + +rnFixityDecl :: FixityEnv -> LFixitySig RdrName -> RnM FixityEnv +rnFixityDecl fix_env (L loc (FixitySig rdr_name fixity)) + = setSrcSpan loc $ + -- GHC extension: look up both the tycon and data con + -- for con-like things + -- If neither are in scope, report an error; otherwise + -- add both to the fixity env + addLocM lookupTopFixSigNames rdr_name `thenM` \ names -> + if null names then + addLocErr rdr_name unknownNameErr `thenM_` + returnM fix_env + else + foldlM add fix_env names + where + add fix_env name + = case lookupNameEnv fix_env name of + Just (FixItem _ _ loc') + -> addLocErr rdr_name (dupFixityDecl loc') `thenM_` + returnM fix_env + Nothing -> returnM (extendNameEnv fix_env name fix_item) + where + fix_item = FixItem (nameOccName name) fixity (getLoc rdr_name) -rnExports mods unqual_imps Nothing - = returnRn (\n -> if isLocallyDefined n then ExportAll else NotExported) +pprFixEnv :: FixityEnv -> SDoc +pprFixEnv env + = pprWithCommas (\ (FixItem n f _) -> ppr f <+> ppr n) + (nameEnvElts env) -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) +dupFixityDecl loc rdr_name + = vcat [ptext SLIT("Multiple fixity declarations for") <+> quotes (ppr rdr_name), + ptext SLIT("also at ") <+> ppr loc + ] \end{code} + %********************************************************* -%* * -\subsection{Type declarations} -%* * +%* * + Source-code deprecations declarations +%* * %********************************************************* -@rnTyDecl@ uses the `global name function' to create a new type -declaration in which local names have been replaced by their original -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. +For deprecations, all we do is check that the names are in scope. +It's only imported deprecations, dealt with in RnIfaces, that we +gather them together. \begin{code} -rnTyDecl :: RdrNameTyDecl -> RnM_Fixes s RenamedTyDecl - -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 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) - = 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) - -rnTyDecl (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' -> - returnRn (TySynonym name' tyvars' ty' src_loc) - -rn_derivs tycon2 locn Nothing -- derivs not specified - = returnRn Nothing - -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" +rnSrcDeprecDecls :: [LDeprecDecl RdrName] -> RnM Deprecations +rnSrcDeprecDecls [] + = returnM NoDeprecs + +rnSrcDeprecDecls decls + = mappM (addLocM rn_deprec) decls `thenM` \ pairs -> + returnM (DeprecSome (mkNameEnv (catMaybes pairs))) + where + rn_deprec (Deprecation rdr_name txt) + = lookupTopBndrRn rdr_name `thenM` \ name -> + returnM (Just (name, (rdrNameOcc rdr_name, txt))) + +checkModDeprec :: Maybe DeprecTxt -> Deprecations +-- Check for a module deprecation; done once at top level +checkModDeprec Nothing = NoDeprecs +checkModDeprec (Just txt) = DeprecAll txt \end{code} -@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. +%********************************************************* +%* * +\subsection{Source code declarations} +%* * +%********************************************************* \begin{code} -rnConDecls :: TyVarNamesEnv - -> [RdrNameConDecl] - -> RnM_Fixes s [RenamedConDecl] - -rnConDecls tv_env con_decls - = mapRn rn_decl con_decls +rnDefaultDecl (DefaultDecl tys) + = mapFvRn (rnHsTypeFVs doc_str) tys `thenM` \ (tys', fvs) -> + returnM (DefaultDecl tys', 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) + doc_str = text "In a `default' declaration" \end{code} %********************************************************* -%* * -\subsection{SPECIALIZE data pragmas} -%* * +%* * + Bindings +%* * %********************************************************* -\begin{code} -rnSpecDataSig :: RdrNameSpecDataSig - -> RnM_Fixes s RenamedSpecDataSig - -rnSpecDataSig (SpecDataSig tycon ty src_loc) - = pushSrcLocRn src_loc $ - let - tyvars = extractMonoTyNames is_tyvar_name ty - in - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env,_) -> - lookupTyCon tycon `thenRn` \ tycon' -> - rnMonoType tv_env ty `thenRn` \ ty' -> - returnRn (SpecDataSig tycon' ty' src_loc) +These chaps are here, rather than in TcBinds, so that there +is just one hi-boot file (for RnSource). rnSrcDecls is part +of the loop too, and it must be defined in this module. -is_tyvar_name n = isLexVarId (getLocalName n) +\begin{code} +rnBindGroups :: [HsBindGroup RdrName] -> RnM ([HsBindGroup Name], DefUses) +-- This version assumes that the binders are already in scope +-- It's used only in 'mdo' +rnBindGroups [] + = returnM ([], emptyDUs) +rnBindGroups [HsBindGroup bind sigs _] + = rnBinds NotTopLevel bind sigs +rnBindGroups b@[HsIPBinds bind] + = do addErr (badIpBinds b) + returnM ([], emptyDUs) +rnBindGroups _ + = panic "rnBindGroups" + +rnBindGroupsAndThen + :: [HsBindGroup RdrName] + -> ([HsBindGroup Name] -> RnM (result, FreeVars)) + -> RnM (result, FreeVars) +-- This version (a) assumes that the binding vars are not already in scope +-- (b) removes the binders from the free vars of the thing inside +-- The parser doesn't produce ThenBinds +rnBindGroupsAndThen [] thing_inside + = thing_inside [] +rnBindGroupsAndThen [HsBindGroup bind sigs _] thing_inside + = rnBindsAndThen bind sigs $ \ groups -> thing_inside groups +rnBindGroupsAndThen [HsIPBinds binds] thing_inside + = rnIPBinds binds `thenM` \ (binds',fv_binds) -> + thing_inside [HsIPBinds binds'] `thenM` \ (thing, fvs_thing) -> + returnM (thing, fvs_thing `plusFV` fv_binds) + +rnIPBinds [] = returnM ([], emptyFVs) +rnIPBinds (bind : binds) + = wrapLocFstM rnIPBind bind `thenM` \ (bind', fvBind) -> + rnIPBinds binds `thenM` \ (binds',fvBinds) -> + returnM (bind' : binds', fvBind `plusFV` fvBinds) + +rnIPBind (IPBind n expr) + = newIPNameRn n `thenM` \ name -> + rnLExpr expr `thenM` \ (expr',fvExpr) -> + return (IPBind name expr', fvExpr) + +badIpBinds binds + = hang (ptext SLIT("Implicit-parameter bindings illegal in 'mdo':")) 4 + (ppr binds) \end{code} + %********************************************************* %* * -\subsection{Class declarations} +\subsection{Foreign 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) - = 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) - 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) +rnHsForeignDecl (ForeignImport name ty spec isDeprec) + = lookupLocatedTopBndrRn name `thenM` \ name' -> + rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) -> + returnM (ForeignImport name' ty' spec isDeprec, fvs) + +rnHsForeignDecl (ForeignExport name ty spec isDeprec) + = lookupLocatedOccRn name `thenM` \ name' -> + rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) -> + returnM (ForeignExport name' ty' spec isDeprec, fvs ) + -- NB: a foreign export is an *occurrence site* for name, so + -- we add it to the free-variable list. It might, for example, + -- be imported from another module + +fo_decl_msg name = ptext SLIT("In the foreign declaration for") <+> ppr name \end{code} @@ -435,286 +323,407 @@ rnClassDecl (ClassDecl context cname tyvar sigs mbinds pragmas src_loc) %* * %********************************************************* - -@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. - \begin{code} -rnInstDecl :: RdrNameInstDecl -> RnM_Fixes s RenamedInstDecl +rnSrcInstDecl (InstDecl inst_ty mbinds uprags) + -- Used for both source and interface file decls + = rnHsSigType (text "an instance decl") inst_ty `thenM` \ inst_ty' -> -rnInstDecl (InstDecl cname ty mbinds from_here modname uprags pragmas src_loc) - = pushSrcLocRn src_loc $ - lookupClass cname `thenRn` \ cname' -> + -- Rename the bindings + -- The typechecker (not the renamer) checks that all + -- the bindings are for the right class + let + meth_doc = text "In the bindings in an instance declaration" + meth_names = collectHsBindLocatedBinders mbinds + (inst_tyvars, _, cls,_) = splitHsInstDeclTy (unLoc inst_ty') + in + checkDupNames meth_doc meth_names `thenM_` + extendTyVarEnvForMethodBinds inst_tyvars ( + -- (Slightly strangely) the forall-d tyvars scope over + -- the method bindings too + rnMethodBinds cls [] mbinds + ) `thenM` \ (mbinds', meth_fvs) -> + -- 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 + let + binders = collectHsBindBinders mbinds' + in + bindLocalNames binders (renameSigs uprags) `thenM` \ uprags' -> + checkSigs (okInstDclSig (mkNameSet binders)) uprags' `thenM_` - rnPolyType [] ty `thenRn` \ ty' -> - -- [] tv_env ensures that tyvars will be foralled + returnM (InstDecl inst_ty' mbinds' uprags', + meth_fvs `plusFV` hsSigsFVs uprags' + `plusFV` extractHsTyNames inst_ty') +\end{code} - rnMethodBinds cname' mbinds `thenRn` \ mbinds' -> - mapRn (rn_uprag cname') uprags `thenRn` \ new_uprags -> +For the method bindings in class and instance decls, we extend the +type variable environment iff -fglasgow-exts - ASSERT(isNoInstancePragmas pragmas) - returnRn (InstDecl cname' ty' mbinds' - from_here modname new_uprags noInstancePragmas src_loc) - 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) +\begin{code} +extendTyVarEnvForMethodBinds tyvars thing_inside + = doptM Opt_GlasgowExts `thenM` \ opt_GlasgowExts -> + if opt_GlasgowExts then + extendTyVarEnvFVRn (map hsLTyVarName tyvars) thing_inside + else + thing_inside \end{code} + %********************************************************* %* * -\subsection{@SPECIALIZE instance@ user-pragmas} +\subsection{Rules} %* * %********************************************************* \begin{code} -rnSpecInstSig :: RdrNameSpecInstSig - -> RnM_Fixes s RenamedSpecInstSig +rnHsRuleDecl (HsRule rule_name act vars lhs rhs) + = bindPatSigTyVarsFV (collectRuleBndrSigTys vars) $ + + bindLocatedLocalsFV doc (map get_var vars) $ \ ids -> + mapFvRn rn_var (vars `zip` ids) `thenM` \ (vars', fv_vars) -> -rnSpecInstSig (SpecInstSig clas ty src_loc) - = pushSrcLocRn src_loc $ + rnLExpr lhs `thenM` \ (lhs', fv_lhs) -> + rnLExpr rhs `thenM` \ (rhs', fv_rhs) -> let - tyvars = extractMonoTyNames is_tyvar_name ty + mb_bad = validRuleLhs ids lhs' 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) + checkErr (isNothing mb_bad) + (badRuleLhsErr rule_name lhs' mb_bad) `thenM_` + let + bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)] + in + mappM (addErr . badRuleVar rule_name) bad_vars `thenM_` + returnM (HsRule rule_name act vars' lhs' rhs', + fv_vars `plusFV` fv_lhs `plusFV` fv_rhs) + where + doc = text "In the transformation rule" <+> ftext rule_name + + get_var (RuleBndr v) = v + get_var (RuleBndrSig v _) = v + + rn_var (RuleBndr (L loc v), id) + = returnM (RuleBndr (L loc id), emptyFVs) + rn_var (RuleBndrSig (L loc v) t, id) + = rnHsTypeFVs doc t `thenM` \ (t', fvs) -> + returnM (RuleBndrSig (L loc id) t', fvs) +\end{code} + +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. We also restrict the form of the LHS so +that it may be plausibly matched. Basically you only get to write ordinary +applications. (E.g. a case expression is not allowed: too elaborate.) + +NB: if you add new cases here, make sure you add new ones to TcRule.ruleLhsTvs + +\begin{code} +validRuleLhs :: [Name] -> LHsExpr Name -> Maybe (HsExpr Name) +-- Nothing => OK +-- Just e => Not ok, and e is the offending expression +validRuleLhs foralls lhs + = checkl lhs + where + checkl (L loc e) = check e + + check (OpApp e1 op _ e2) = checkl op `seqMaybe` checkl_e e1 `seqMaybe` checkl_e e2 + check (HsApp e1 e2) = checkl e1 `seqMaybe` checkl_e e2 + check (HsVar v) | v `notElem` foralls = Nothing + check other = Just other -- Failure + + checkl_e (L loc e) = check_e e + + check_e (HsVar v) = Nothing + check_e (HsPar e) = checkl_e e + check_e (HsLit e) = Nothing + check_e (HsOverLit e) = Nothing + + check_e (OpApp e1 op _ e2) = checkl_e e1 `seqMaybe` checkl_e op `seqMaybe` checkl_e e2 + check_e (HsApp e1 e2) = checkl_e e1 `seqMaybe` checkl_e e2 + check_e (NegApp e _) = checkl_e e + check_e (ExplicitList _ es) = checkl_es es + check_e (ExplicitTuple es _) = checkl_es es + check_e other = Just other -- Fails + + checkl_es es = foldr (seqMaybe . checkl_e) Nothing es + +badRuleLhsErr name lhs (Just bad_e) + = sep [ptext SLIT("Rule") <+> ftext name <> colon, + nest 4 (vcat [ptext SLIT("Illegal expression:") <+> ppr bad_e, + ptext SLIT("in 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") <+> doubleQuotes (ftext name) <> colon, + ptext SLIT("Forall'd variable") <+> quotes (ppr var) <+> + ptext SLIT("does not appear on left hand side")] \end{code} + %********************************************************* %* * -\subsection{Default declarations} +\subsection{Type, class and iface sig declarations} %* * %********************************************************* -@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. - -\begin{code} -rnDefaultDecl :: [RdrNameDefaultDecl] -> RnM_Fixes s [RenamedDefaultDecl] - -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] -\end{code} +@rnTyDecl@ uses the `global name function' to create a new type +declaration in which local names have been replaced by their original +names, reporting any unknown names. -%************************************************************************* -%* * -\subsection{Fixity declarations} -%* * -%************************************************************************* +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. \begin{code} -rnFixes :: [RdrNameFixityDecl] -> RnM s [RenamedFixityDecl] +rnTyClDecl (ForeignType {tcdLName = name, tcdFoType = fo_type, tcdExtName = ext_name}) + = lookupLocatedTopBndrRn name `thenM` \ name' -> + returnM (ForeignType {tcdLName = name', tcdFoType = fo_type, tcdExtName = ext_name}, + emptyFVs) + +rnTyClDecl (TyData {tcdND = new_or_data, tcdCtxt = context, tcdLName = tycon, + tcdTyVars = tyvars, tcdCons = condecls, + tcdKindSig = sig, tcdDerivs = derivs}) + | is_vanilla -- Normal Haskell data type decl + = ASSERT( isNothing sig ) -- In normal H98 form, kind signature on the + -- data type is syntactically illegal + bindTyVarsRn data_doc tyvars $ \ tyvars' -> + do { tycon' <- lookupLocatedTopBndrRn tycon + ; context' <- rnContext data_doc context + ; (derivs', deriv_fvs) <- rn_derivs derivs + ; checkDupNames data_doc con_names + ; condecls' <- rnConDecls (unLoc tycon') condecls + ; returnM (TyData {tcdND = new_or_data, tcdCtxt = context', tcdLName = tycon', + tcdTyVars = tyvars', tcdKindSig = Nothing, tcdCons = condecls', + tcdDerivs = derivs'}, + delFVs (map hsLTyVarName tyvars') $ + extractHsCtxtTyNames context' `plusFV` + plusFVs (map conDeclFVs condecls') `plusFV` + deriv_fvs) } + + | otherwise -- GADT + = ASSERT( null (unLoc context) ) + do { tycon' <- lookupLocatedTopBndrRn tycon + ; tyvars' <- bindTyVarsRn data_doc tyvars + (\ tyvars' -> return tyvars') + -- For GADTs, the type variables in the declaration + -- do not scope over the constructor signatures + -- data T a where { T1 :: forall b. b-> b } + ; (derivs', deriv_fvs) <- rn_derivs derivs + ; checkDupNames data_doc con_names + ; condecls' <- rnConDecls (unLoc tycon') condecls + ; returnM (TyData {tcdND = new_or_data, tcdCtxt = noLoc [], tcdLName = tycon', + tcdTyVars = tyvars', tcdCons = condecls', tcdKindSig = sig, + tcdDerivs = derivs'}, + plusFVs (map conDeclFVs condecls') `plusFV` deriv_fvs) } -rnFixes fixities - = getSrcLocRn `thenRn` \ src_loc -> + where + is_vanilla = case condecls of -- Yuk + [] -> True + L _ (ConDecl {}) : _ -> True + other -> False + + data_doc = text "In the data type declaration for" <+> quotes (ppr tycon) + con_names = map con_names_helper condecls + + con_names_helper (L _ (ConDecl n _ _ _)) = n + con_names_helper (L _ (GadtDecl n _)) = n + + rn_derivs Nothing = returnM (Nothing, emptyFVs) + rn_derivs (Just ds) = rnLHsTypes data_doc ds `thenM` \ ds' -> + returnM (Just ds', extractHsTyNames_s ds') + +rnTyClDecl (TySynonym {tcdLName = name, tcdTyVars = tyvars, tcdSynRhs = ty}) + = lookupLocatedTopBndrRn name `thenM` \ name' -> + bindTyVarsRn syn_doc tyvars $ \ tyvars' -> + rnHsTypeFVs syn_doc ty `thenM` \ (ty', fvs) -> + returnM (TySynonym {tcdLName = name', tcdTyVars = tyvars', + tcdSynRhs = ty'}, + delFVs (map hsLTyVarName tyvars') fvs) + where + syn_doc = text "In the declaration for type synonym" <+> quotes (ppr name) + +rnTyClDecl (ClassDecl {tcdCtxt = context, tcdLName = cname, + tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs, + tcdMeths = mbinds}) + = lookupLocatedTopBndrRn cname `thenM` \ cname' -> + + -- Tyvars scope over superclass context and method signatures + bindTyVarsRn cls_doc tyvars ( \ tyvars' -> + rnContext cls_doc context `thenM` \ context' -> + rnFds cls_doc fds `thenM` \ fds' -> + renameSigs sigs `thenM` \ sigs' -> + returnM (tyvars', context', fds', sigs') + ) `thenM` \ (tyvars', context', fds', sigs') -> + + -- Check the signatures + -- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs). 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) + sig_rdr_names_w_locs = [op | L _ (Sig op _) <- sigs] in - mapRn (addErrRn . dupFixityDeclErr src_loc) dup_fixes `thenRn_` - mapRn rn_fixity fixities `thenRn` \ fixes_maybe -> - returnRn (catMaybes fixes_maybe) - -nameFixDecl (InfixL name i) = name -nameFixDecl (InfixR name i) = name -nameFixDecl (InfixN name i) = name + checkDupNames sig_doc sig_rdr_names_w_locs `thenM_` + checkSigs okClsDclSig sigs' `thenM_` + -- 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. + + -- 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. + extendTyVarEnvForMethodBinds tyvars' ( + getLocalRdrEnv `thenM` \ name_env -> + let + meth_rdr_names_w_locs = collectHsBindLocatedBinders mbinds + gen_rdr_tyvars_w_locs = + [ tv | tv <- extractGenericPatTyVars mbinds, + not (unLoc tv `elemLocalRdrEnv` name_env) ] + in + checkDupNames meth_doc meth_rdr_names_w_locs `thenM_` + newLocalsRn gen_rdr_tyvars_w_locs `thenM` \ gen_tyvars -> + rnMethodBinds (unLoc cname') gen_tyvars mbinds + ) `thenM` \ (mbinds', meth_fvs) -> + + returnM (ClassDecl { tcdCtxt = context', tcdLName = cname', tcdTyVars = tyvars', + tcdFDs = fds', tcdSigs = sigs', tcdMeths = mbinds'}, + delFVs (map hsLTyVarName tyvars') $ + extractHsCtxtTyNames context' `plusFV` + plusFVs (map extractFunDepNames (map unLoc fds')) `plusFV` + hsSigsFVs sigs' `plusFV` + meth_fvs) + where + meth_doc = text "In the default-methods for class" <+> ppr cname + cls_doc = text "In the declaration for class" <+> ppr cname + sig_doc = text "In the signatures for class" <+> ppr cname \end{code} %********************************************************* %* * -\subsection{Support code to rename types} +\subsection{Support code for type/data declarations} %* * %********************************************************* \begin{code} -rnPolyType :: TyVarNamesEnv - -> RdrNamePolyType - -> RnM_Fixes s RenamedPolyType - -rnPolyType tv_env (HsForAllTy tvs ctxt ty) - = rn_poly_help tv_env tvs ctxt ty +rnConDecls :: Name -> [LConDecl RdrName] -> RnM [LConDecl Name] +rnConDecls tycon condecls + = -- Check that there's at least one condecl, + -- or else we're reading an interface file, or -fglasgow-exts + (if null condecls then + doptM Opt_GlasgowExts `thenM` \ glaExts -> + checkErr glaExts (emptyConDeclsErr tycon) + else returnM () + ) `thenM_` + mappM (wrapLocM rnConDecl) condecls + +rnConDecl :: ConDecl RdrName -> RnM (ConDecl Name) +rnConDecl (ConDecl name tvs cxt details) + = addLocM checkConName name `thenM_` + lookupLocatedTopBndrRn name `thenM` \ new_name -> + + bindTyVarsRn doc tvs $ \ new_tyvars -> + rnContext doc cxt `thenM` \ new_context -> + rnConDetails doc details `thenM` \ new_details -> + returnM (ConDecl new_name new_tyvars new_context new_details) + where + doc = text "In the definition of data constructor" <+> quotes (ppr name) -rnPolyType tv_env (HsPreForAllTy ctxt ty) - = rn_poly_help tv_env forall_tyvars ctxt ty +rnConDecl (GadtDecl name ty) + = addLocM checkConName name `thenM_` + lookupLocatedTopBndrRn name `thenM` \ new_name -> + rnHsSigType doc ty `thenM` \ new_ty -> + returnM (GadtDecl new_name new_ty) 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) -\end{code} + doc = text "In the definition of data constructor" <+> quotes (ppr name) -\begin{code} -rnMonoType :: TyVarNamesEnv - -> RdrNameMonoType - -> RnM_Fixes s RenamedMonoType - -rnMonoType tv_env (MonoTyVar tyvar) - = lookupTyVarName tv_env tyvar `thenRn` \ tyvar' -> - returnRn (MonoTyVar tyvar') - -rnMonoType tv_env (MonoListTy ty) - = rnMonoType tv_env ty `thenRn` \ ty' -> - returnRn (MonoListTy ty') - -rnMonoType tv_env (MonoFunTy ty1 ty2) - = andRn MonoFunTy (rnMonoType tv_env ty1) - (rnMonoType tv_env ty2) - -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} +rnConDetails doc (PrefixCon tys) + = mappM (rnLHsType doc) tys `thenM` \ new_tys -> + returnM (PrefixCon new_tys) -\begin{code} -rnContext :: TyVarNamesEnv -> RdrNameContext -> RnM_Fixes s RenamedContext +rnConDetails doc (InfixCon ty1 ty2) + = rnLHsType doc ty1 `thenM` \ new_ty1 -> + rnLHsType doc ty2 `thenM` \ new_ty2 -> + returnM (InfixCon new_ty1 new_ty2) -rnContext tv_env ctxt - = mapRn rn_ctxt ctxt +rnConDetails doc (RecCon fields) + = checkDupNames doc field_names `thenM_` + mappM (rnField doc) fields `thenM` \ new_fields -> + returnM (RecCon new_fields) where - rn_ctxt (clas, tyvar) - = lookupClass clas `thenRn` \ clas_name -> - lookupTyVarName tv_env tyvar `thenRn` \ tyvar_name -> - returnRn (clas_name, tyvar_name) + field_names = [fld | (fld, _) <- fields] + +rnField doc (name, ty) + = lookupLocatedTopBndrRn name `thenM` \ new_name -> + rnLHsType doc ty `thenM` \ new_ty -> + returnM (new_name, 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 = checkErr (isRdrDataCon name) (badDataCon name) + +badDataCon name + = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)] + +emptyConDeclsErr tycon + = sep [quotes (ppr tycon) <+> ptext SLIT("has no constructors"), + nest 4 (ptext SLIT("(-fglasgow-exts permits this)"))] \end{code} +%********************************************************* +%* * +\subsection{Support code to rename types} +%* * +%********************************************************* + \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) +rnFds :: SDoc -> [Located (FunDep RdrName)] -> RnM [Located (FunDep Name)] + +rnFds doc fds + = mappM (wrapLocM rn_fds) fds where - item1 - = addShortErrLocLine locn1 (\ sty -> ppStr "multiple default declarations") sty + rn_fds (tys1, tys2) + = rnHsTyVars doc tys1 `thenM` \ tys1' -> + rnHsTyVars doc tys2 `thenM` \ tys2' -> + returnM (tys1', tys2') - dup_item (DefaultDecl _ locn) - = addShortErrLocLine locn (\ sty -> ppStr "here was another default declaration") sty +rnHsTyVars doc tvs = mappM (rnHsTyvar doc) tvs +rnHsTyvar doc tyvar = lookupOccRn tyvar +\end{code} -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)) +%********************************************************* +%* * + Splices +%* * +%********************************************************* + +\begin{code} +rnSplice :: HsSplice RdrName -> RnM (HsSplice Name, FreeVars) +rnSplice (HsSplice n expr) + = checkTH expr "splice" `thenM_` + getSrcSpanM `thenM` \ loc -> + newLocalsRn [L loc n] `thenM` \ [n'] -> + rnLExpr expr `thenM` \ (expr', fvs) -> + returnM (HsSplice n' expr', fvs) \end{code}