X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnNames.lhs;h=e95e4917dbe68aa906e1aff4e5f8a228c945a0ef;hb=db95d6e8d319b0c5cee1ccc23751e8190152ade3;hp=53d04e1d0808c7ba50704aca292685be829a31bc;hpb=68afb16743cafd5b7495771d359891c6dfc5a186;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnNames.lhs b/ghc/compiler/rename/RnNames.lhs index 53d04e1..e95e491 100644 --- a/ghc/compiler/rename/RnNames.lhs +++ b/ghc/compiler/rename/RnNames.lhs @@ -1,838 +1,617 @@ % -% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996 +% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998 % \section[RnNames]{Extracting imported and top-level names in scope} \begin{code} -#include "HsVersions.h" - module RnNames ( - getGlobalNames, - GlobalNameInfo(..) + getGlobalNames ) where -import PreludeGlaST ( MutableVar(..) ) - -import Ubiq +#include "HsVersions.h" -import HsSyn -import RdrHsSyn -import RnHsSyn +import CmdLineOpts ( DynFlag(..) ) -import RnMonad -import RnIfaces ( IfaceCache(..), cachedIface, cachedDecl ) -import RnUtils ( RnEnv(..), emptyRnEnv, extendGlobalRnEnv, - lubExportFlag, qualNameErr, dupNamesErr, negateNameWarn ) -import ParseUtils ( ParsedIface(..), RdrIfaceDecl(..), RdrIfaceInst ) - - -import Bag ( emptyBag, unitBag, consBag, snocBag, unionBags, - unionManyBags, mapBag, filterBag, listToBag, bagToList ) -import CmdLineOpts ( opt_NoImplicitPrelude ) -import ErrUtils ( Error(..), Warning(..), addErrLoc, addShortErrLocLine ) -import FiniteMap ( emptyFM, addListToFM, lookupFM, fmToList, eltsFM, delListFromFM ) -import Id ( GenId ) -import Maybes ( maybeToBool, catMaybes, MaybeErr(..) ) -import Name ( RdrName(..), Name, isQual, mkTopLevName, origName, - mkImportedName, nameExportFlag, nameImportFlag, - getLocalName, getSrcLoc, getImpLocs, moduleNamePair, - pprNonSym, isLexCon, isRdrLexCon, ExportFlag(..) +import HsSyn ( HsModule(..), HsDecl(..), IE(..), ieName, ImportDecl(..), + ForeignDecl(..), ForKind(..), isDynamicExtName, + collectTopBinders ) -import PrelInfo ( BuiltinNames(..), BuiltinKeys(..) ) -import PrelMods ( fromPrelude, pRELUDE ) -import Pretty -import SrcLoc ( SrcLoc, mkBuiltinSrcLoc ) -import TyCon ( tyConDataCons ) -import UniqFM ( emptyUFM, addListToUFM_C, lookupUFM ) -import UniqSupply ( splitUniqSupply ) -import Util ( isIn, assoc, cmpPString, sortLt, removeDups, - equivClasses, panic, assertPanic ) +import RdrHsSyn ( RdrNameIE, RdrNameImportDecl, + RdrNameHsModule, RdrNameHsDecl + ) +import RnIfaces ( getInterfaceExports, recordLocalSlurps ) +import RnHiFiles ( getTyClDeclBinders ) +import RnEnv +import RnMonad + +import FiniteMap +import PrelNames ( pRELUDE_Name, mAIN_Name, main_RDR_Unqual, isUnboundName ) +import UniqFM ( lookupUFM ) +import Bag ( bagToList ) +import Module ( ModuleName, moduleName, WhereFrom(..) ) +import NameSet +import Name ( Name, nameSrcLoc, nameOccName, nameEnvElts ) +import HscTypes ( Provenance(..), ImportReason(..), GlobalRdrEnv, + GenAvailInfo(..), AvailInfo, Avails, AvailEnv ) +import RdrName ( RdrName, rdrNameOcc, setRdrNameOcc, mkRdrQual, mkRdrUnqual ) +import OccName ( setOccNameSpace, dataName ) +import NameSet ( elemNameSet, emptyNameSet ) +import Outputable +import Maybes ( maybeToBool, catMaybes, mapMaybe ) +import UniqFM ( emptyUFM, listToUFM ) +import ListSetOps ( removeDups ) +import Util ( sortLt ) +import List ( partition ) \end{code} -\begin{code} -type GlobalNameInfo = (BuiltinNames, - BuiltinKeys, - Name -> ExportFlag, -- export flag - Name -> [RdrName]) -- occurence names - -type RnM_Info s r = RnMonad GlobalNameInfo s r - -getGlobalNames :: - IfaceCache - -> GlobalNameInfo - -> UniqSupply - -> RdrNameHsModule - -> IO (RnEnv, - [Module], -- directly imported modules - Bag (Module,RnName), -- unqualified imports from module - Bag RenamedFixityDecl, -- imported fixity decls - Bag Error, - Bag Warning) - -getGlobalNames iface_cache info us - (HsModule mod _ _ imports _ ty_decls _ cls_decls _ _ _ binds _ _) - = case initRn True mod emptyRnEnv us1 - (setExtraRn info $ - getSourceNames ty_decls cls_decls binds) - of { ((src_vals, src_tcs), src_errs, src_warns) -> - - doImportDecls iface_cache info us2 imports >>= - \ (imp_vals, imp_tcs, imp_mods, unqual_imps, imp_fixes, imp_errs, imp_warns) -> - let - unqual_vals = map (\rn -> (Unqual (getLocalName rn), rn)) (bagToList src_vals) - unqual_tcs = map (\rn -> (Unqual (getLocalName rn), rn)) (bagToList src_tcs) +%************************************************************************ +%* * +\subsection{Get global names} +%* * +%************************************************************************ - (src_env, src_dups) = extendGlobalRnEnv emptyRnEnv unqual_vals unqual_tcs - (all_env, imp_dups) = extendGlobalRnEnv src_env (bagToList imp_vals) (bagToList imp_tcs) +\begin{code} +getGlobalNames :: Module -> RdrNameHsModule + -> RnMG (GlobalRdrEnv, -- Maps all in-scope things + GlobalRdrEnv, -- Maps just *local* things + ExportAvails) -- The exported stuff + +getGlobalNames this_mod (HsModule _ _ exports imports decls _ mod_loc) + = -- PROCESS LOCAL DECLS + -- Do these *first* so that the correct provenance gets + -- into the global name cache. + importsFromLocalDecls this_mod decls `thenRn` \ (local_gbl_env, local_mod_avails) -> + + -- PROCESS IMPORT DECLS + -- Do the non {- SOURCE -} ones first, so that we get a helpful + -- warning for {- SOURCE -} ones that are unnecessary + doptRn Opt_NoImplicitPrelude `thenRn` \ opt_no_prelude -> + let + all_imports = mk_prel_imports opt_no_prelude ++ imports + (source, ordinary) = partition is_source_import all_imports + is_source_import (ImportDecl _ ImportByUserSource _ _ _ _) = True + is_source_import other = False - -- remove dups of the same imported thing - diff_imp_dups = filterBag diff_orig imp_dups - diff_orig (_,rn1,rn2) = origName rn1 /= origName rn2 + get_imports = importsFromImportDecl this_mod_name + in + mapAndUnzipRn get_imports ordinary `thenRn` \ (imp_gbl_envs1, imp_avails_s1) -> + mapAndUnzipRn get_imports source `thenRn` \ (imp_gbl_envs2, imp_avails_s2) -> - all_dups = bagToList (src_dups `unionBags` diff_imp_dups) - dup_errs = map dup_err (equivClasses cmp_rdr all_dups) - cmp_rdr (rdr1,_,_) (rdr2,_,_) = cmp rdr1 rdr2 - dup_err ((rdr,rn1,rn2):rest) = globalDupNamesErr rdr (rn1:rn2: [rn|(_,_,rn)<-rest]) + -- COMBINE RESULTS + -- We put the local env second, so that a local provenance + -- "wins", even if a module imports itself. + let + gbl_env :: GlobalRdrEnv + imp_gbl_env = foldr plusGlobalRdrEnv emptyRdrEnv (imp_gbl_envs2 ++ imp_gbl_envs1) + gbl_env = imp_gbl_env `plusGlobalRdrEnv` local_gbl_env - all_errs = src_errs `unionBags` imp_errs `unionBags` listToBag dup_errs - all_warns = src_warns `unionBags` imp_warns - in - return (all_env, imp_mods, unqual_imps, imp_fixes, all_errs, all_warns) - } + all_avails :: ExportAvails + all_avails = foldr plusExportAvails local_mod_avails (imp_avails_s2 ++ imp_avails_s1) + in + + -- ALL DONE + returnRn (gbl_env, local_gbl_env, all_avails) where - (us1, us2) = splitUniqSupply us + this_mod_name = moduleName this_mod + + -- NB: opt_NoImplicitPrelude is slightly different to import Prelude (); + -- because the former doesn't even look at Prelude.hi for instance declarations, + -- whereas the latter does. + mk_prel_imports no_prelude + | this_mod_name == pRELUDE_Name || + explicit_prelude_import || + no_prelude + = [] + + | otherwise = [ImportDecl pRELUDE_Name + ImportByUser + False {- Not qualified -} + Nothing {- No "as" -} + Nothing {- No import list -} + mod_loc] + + explicit_prelude_import + = not (null [ () | (ImportDecl mod _ _ _ _ _) <- imports, mod == pRELUDE_Name ]) \end{code} + +\begin{code} +importsFromImportDecl :: ModuleName + -> RdrNameImportDecl + -> RnMG (GlobalRdrEnv, + ExportAvails) -********************************************************* -* * -\subsection{Top-level source names} -* * -********************************************************* +importsFromImportDecl this_mod_name (ImportDecl imp_mod_name from qual_only as_mod import_spec iloc) + = pushSrcLocRn iloc $ + getInterfaceExports imp_mod_name from `thenRn` \ (imp_mod, avails_by_module) -> + + if null avails_by_module then + -- If there's an error in getInterfaceExports, (e.g. interface + -- file not found) we get lots of spurious errors from 'filterImports' + returnRn (emptyRdrEnv, mkEmptyExportAvails imp_mod_name) + else -\begin{code} -getSourceNames :: - [RdrNameTyDecl] - -> [RdrNameClassDecl] - -> RdrNameHsBinds - -> RnM_Info s (Bag RnName, -- values - Bag RnName) -- tycons/classes - -getSourceNames ty_decls cls_decls binds - = mapAndUnzip3Rn getTyDeclNames ty_decls `thenRn` \ (tycon_s, constrs_s, fields_s) -> - mapAndUnzipRn getClassNames cls_decls `thenRn` \ (cls_s, cls_ops_s) -> - getTopBindsNames binds `thenRn` \ bind_names -> - returnRn (unionManyBags constrs_s `unionBags` - unionManyBags fields_s `unionBags` - unionManyBags cls_ops_s `unionBags` bind_names, - listToBag tycon_s `unionBags` listToBag cls_s) - - -getTyDeclNames :: RdrNameTyDecl - -> RnM_Info s (RnName, Bag RnName, Bag RnName) -- tycon, constrs and fields - -getTyDeclNames (TyData _ tycon _ condecls _ _ src_loc) - = newGlobalName src_loc Nothing tycon `thenRn` \ tycon_name -> - getConFieldNames (Just (nameExportFlag tycon_name)) emptyBag emptyBag emptyFM - condecls `thenRn` \ (con_names, field_names) -> let - rn_tycon = RnData tycon_name con_names field_names - rn_constrs = [ RnConstr name tycon_name | name <- con_names] - rn_fields = [ RnField name tycon_name | name <- field_names] + avails :: Avails + avails = [ avail | (mod_name, avails) <- avails_by_module, + mod_name /= this_mod_name, + avail <- avails ] + -- If the module exports anything defined in this module, just ignore it. + -- Reason: otherwise it looks as if there are two local definition sites + -- for the thing, and an error gets reported. Easiest thing is just to + -- filter them out up front. This situation only arises if a module + -- imports itself, or another module that imported it. (Necessarily, + -- this invoves a loop.) + -- + -- Tiresome consequence: if you say + -- module A where + -- import B( AType ) + -- type AType = ... + -- + -- module B( AType ) where + -- import {-# SOURCE #-} A( AType ) + -- + -- then you'll get a 'B does not export AType' message. Oh well. + in - returnRn (rn_tycon, listToBag rn_constrs, listToBag rn_fields) + filterImports imp_mod_name from import_spec avails `thenRn` \ (filtered_avails, hides, explicits) -> -getTyDeclNames (TyNew _ tycon _ [NewConDecl con _ con_loc] _ _ src_loc) - = newGlobalName src_loc Nothing tycon `thenRn` \ tycon_name -> - newGlobalName con_loc (Just (nameExportFlag tycon_name)) con - `thenRn` \ con_name -> - returnRn (RnData tycon_name [con_name] [], - unitBag (RnConstr con_name tycon_name), - emptyBag) + let + mk_provenance name = NonLocalDef (UserImport imp_mod iloc (name `elemNameSet` explicits)) + in -getTyDeclNames (TySynonym tycon _ _ src_loc) - = newGlobalName src_loc Nothing tycon `thenRn` \ tycon_name -> - returnRn (RnSyn tycon_name, emptyBag, emptyBag) + qualifyImports imp_mod_name + (not qual_only) -- Maybe want unqualified names + as_mod hides + mk_provenance + filtered_avails +\end{code} -getConFieldNames exp constrs fields have [] - = returnRn (bagToList constrs, bagToList fields) +\begin{code} +importsFromLocalDecls this_mod decls + = mapRn (getLocalDeclBinders this_mod) decls `thenRn` \ avails_s -> -getConFieldNames exp constrs fields have (ConDecl con _ src_loc : rest) - = newGlobalName src_loc exp con `thenRn` \ con_name -> - getConFieldNames exp (constrs `snocBag` con_name) fields have rest + let + avails = concat avails_s -getConFieldNames exp constrs fields have (ConOpDecl _ con _ src_loc : rest) - = newGlobalName src_loc exp con `thenRn` \ con_name -> - getConFieldNames exp (constrs `snocBag` con_name) fields have rest + all_names :: [Name] -- All the defns; no dups eliminated + all_names = [name | avail <- avails, name <- availNames avail] -getConFieldNames exp constrs fields have (RecConDecl con fielddecls src_loc : rest) - = mapRn (addErrRn . dupFieldErr con src_loc) dups `thenRn_` - newGlobalName src_loc exp con `thenRn` \ con_name -> - mapRn (newGlobalName src_loc exp) new_fields `thenRn` \ field_names -> - let - all_constrs = constrs `snocBag` con_name - all_fields = fields `unionBags` listToBag field_names + dups :: [[Name]] + (_, dups) = removeDups compare all_names in - getConFieldNames exp all_constrs all_fields new_have rest + -- Check for duplicate definitions + mapRn_ (addErrRn . dupDeclErr) dups `thenRn_` + + -- Record that locally-defined things are available + recordLocalSlurps avails `thenRn_` + + -- Build the environment + qualifyImports (moduleName this_mod) + True -- Want unqualified names + Nothing -- no 'as M' + [] -- Hide nothing + (\n -> LocalDef) -- Provenance is local + avails + +--------------------------- +getLocalDeclBinders :: Module + -> RdrNameHsDecl -> RnMG Avails +getLocalDeclBinders mod (TyClD tycl_decl) + = -- For type and class decls, we generate Global names, with + -- no export indicator. They need to be global because they get + -- permanently bound into the TyCons and Classes. They don't need + -- an export indicator because they are all implicitly exported. + getTyClDeclBinders mod tycl_decl `thenRn` \ avail -> + returnRn [avail] + +getLocalDeclBinders mod (ValD binds) + = mapRn new (bagToList (collectTopBinders binds)) where - (uniq_fields, dups) = removeDups cmp (concat (map fst fielddecls)) - new_fields = filter (not . maybeToBool . lookupFM have) uniq_fields - new_have = addListToFM have (zip new_fields (repeat ())) - -getClassNames :: RdrNameClassDecl - -> RnM_Info s (RnName, Bag RnName) -- class and class ops + new (rdr_name, loc) = newTopBinder mod rdr_name loc `thenRn` \ name -> + returnRn (Avail name) -getClassNames (ClassDecl _ cname _ sigs _ _ src_loc) - = newGlobalName src_loc Nothing cname `thenRn` \ class_name -> - getClassOpNames (Just (nameExportFlag class_name)) - sigs `thenRn` \ op_names -> - returnRn (RnClass class_name op_names, - listToBag (map (\ n -> RnClassOp n class_name) op_names)) +getLocalDeclBinders mod (ForD (ForeignDecl nm kind _ ext_nm _ loc)) + | binds_haskell_name kind + = newTopBinder mod nm loc `thenRn` \ name -> + returnRn [Avail name] -getClassOpNames exp [] + | otherwise -- a foreign export = returnRn [] -getClassOpNames exp (ClassOpSig op _ _ src_loc : sigs) - = newGlobalName src_loc exp op `thenRn` \ op_name -> - getClassOpNames exp sigs `thenRn` \ op_names -> - returnRn (op_name : op_names) -getClassOpNames exp (_ : sigs) - = getClassOpNames exp sigs + where + binds_haskell_name (FoImport _) = True + binds_haskell_name FoLabel = True + binds_haskell_name FoExport = isDynamicExtName ext_nm + +getLocalDeclBinders mod (FixD _) = returnRn [] +getLocalDeclBinders mod (DeprecD _) = returnRn [] +getLocalDeclBinders mod (DefD _) = returnRn [] +getLocalDeclBinders mod (InstD _) = returnRn [] +getLocalDeclBinders mod (RuleD _) = returnRn [] \end{code} -********************************************************* -* * -\subsection{Bindings} -* * -********************************************************* -\begin{code} -getTopBindsNames :: RdrNameHsBinds - -> RnM_Info s (Bag RnName) - -getTopBindsNames binds = doBinds binds - -doBinds EmptyBinds = returnRn emptyBag -doBinds (SingleBind bind) = doBind bind -doBinds (BindWith bind sigs) = doBind bind -doBinds (ThenBinds binds1 binds2) - = andRn unionBags (doBinds binds1) (doBinds binds2) - -doBind EmptyBind = returnRn emptyBag -doBind (NonRecBind mbind) = doMBinds mbind -doBind (RecBind mbind) = doMBinds mbind - -doMBinds EmptyMonoBinds = returnRn emptyBag -doMBinds (PatMonoBind pat grhss_and_binds locn) = doPat locn pat -doMBinds (FunMonoBind p_name _ _ locn) = doName locn p_name -doMBinds (AndMonoBinds mbinds1 mbinds2) - = andRn unionBags (doMBinds mbinds1) (doMBinds mbinds2) - -doPats locn pats - = mapRn (doPat locn) pats `thenRn` \ pats_s -> - returnRn (unionManyBags pats_s) - -doPat locn WildPatIn = returnRn emptyBag -doPat locn (LitPatIn _) = returnRn emptyBag -doPat locn (LazyPatIn pat) = doPat locn pat -doPat locn (VarPatIn var) = doName locn var -doPat locn (NegPatIn pat) = doPat locn pat -doPat locn (ParPatIn pat) = doPat locn pat -doPat locn (ListPatIn pats) = doPats locn pats -doPat locn (TuplePatIn pats) = doPats locn pats -doPat locn (ConPatIn name pats) = doPats locn pats -doPat locn (ConOpPatIn p1 op p2) - = andRn unionBags (doPat locn p1) (doPat locn p2) -doPat locn (AsPatIn as_name pat) - = andRn unionBags (doName locn as_name) (doPat locn pat) -doPat locn (RecPatIn name fields) - = mapRn (doField locn) fields `thenRn` \ fields_s -> - returnRn (unionManyBags fields_s) - -doField locn (_, pat, _) = doPat locn pat - -doName locn rdr - = newGlobalName locn Nothing rdr `thenRn` \ name -> - returnRn (unitBag (RnName name)) -\end{code} +%************************************************************************ +%* * +\subsection{Filtering imports} +%* * +%************************************************************************ -********************************************************* -* * -\subsection{Creating a new global name} -* * -********************************************************* +@filterImports@ takes the @ExportEnv@ telling what the imported module makes +available, and filters it through the import spec (if any). \begin{code} -newGlobalName :: SrcLoc -> Maybe ExportFlag - -> RdrName -> RnM_Info s Name - --- ToDo: b_names and b_keys being defined in this module !!! - -newGlobalName locn maybe_exp rdr - = getExtraRn `thenRn` \ (_,b_keys,exp_fn,occ_fn) -> - getModuleRn `thenRn` \ mod -> - rnGetUnique `thenRn` \ u -> +filterImports :: ModuleName -- The module being imported + -> WhereFrom -- Tells whether it's a {-# SOURCE #-} import + -> Maybe (Bool, [RdrNameIE]) -- Import spec; True => hiding + -> [AvailInfo] -- What's available + -> RnMG ([AvailInfo], -- What's actually imported + [AvailInfo], -- What's to be hidden + -- (the unqualified version, that is) + -- (We need to return both the above sets, because + -- the qualified version is never hidden; so we can't + -- implement hiding by reducing what's imported.) + NameSet) -- What was imported explicitly + + -- Complains if import spec mentions things that the module doesn't export + -- Warns/informs if import spec contains duplicates. +filterImports mod from Nothing imports + = returnRn (imports, [], emptyNameSet) + +filterImports mod from (Just (want_hiding, import_items)) total_avails + = flatMapRn get_item import_items `thenRn` \ avails_w_explicits -> let - (uniq, unqual) - = case rdr of - Qual m n -> (u, n) - Unqual n -> case (lookupFM b_keys n) of - Nothing -> (u, n) - Just (key,_) -> (key, n) - - orig = if fromPrelude mod - then (Unqual unqual) - else (Qual mod unqual) - - exp = case maybe_exp of - Just exp -> exp - Nothing -> exp_fn n - - n = mkTopLevName uniq orig locn exp (occ_fn n) -- NB: two "n"s + (item_avails, explicits_s) = unzip avails_w_explicits + explicits = foldl addListToNameSet emptyNameSet explicits_s in - addWarnIfRn (rdr == Unqual SLIT("negate")) (negateNameWarn (rdr, locn)) `thenRn_` - addErrIfRn (isQual rdr) (qualNameErr "name in definition" (rdr, locn)) `thenRn_` - returnRn n -\end{code} - -********************************************************* -* * -\subsection{Imported names} -* * -********************************************************* - -\begin{code} -type ImportNameInfo = (GlobalNameInfo, - FiniteMap (Module,FAST_STRING) RnName, -- values imported so far - FiniteMap (Module,FAST_STRING) RnName, -- tycons/classes imported so far - Name -> (ExportFlag, [SrcLoc])) -- import flag and src locns - -type RnM_IInfo s r = RnMonad ImportNameInfo s r - -doImportDecls :: - IfaceCache - -> GlobalNameInfo -- builtin and knot name info - -> UniqSupply - -> [RdrNameImportDecl] -- import declarations - -> IO (Bag (RdrName,RnName), -- imported values in scope - Bag (RdrName,RnName), -- imported tycons/classes in scope - [Module], -- directly imported modules - Bag (Module,RnName), -- unqualified import from module - Bag RenamedFixityDecl, -- fixity info for imported names - Bag Error, - Bag Warning) - -doImportDecls iface_cache g_info us src_imps - = fixIO ( \ ~(_, _, _, _, _, _, rec_imp_stuff) -> - let - rec_imp_fm = addListToUFM_C add_stuff emptyUFM (bagToList rec_imp_stuff) - add_stuff (imp1,locns1) (imp2,locns2) = (lubExportFlag imp1 imp2, locns1 `unionBags` locns2) - - rec_imp_fn :: Name -> (ExportFlag, [SrcLoc]) - rec_imp_fn n = case lookupUFM rec_imp_fm n of - Nothing -> panic "RnNames:rec_imp_fn" - Just (flag, locns) -> (flag, bagToList locns) - - i_info = (g_info, emptyFM, emptyFM, rec_imp_fn) - in - -- cache the imported modules - -- this ensures that all directly imported modules - -- will have their original name iface in scope - accumulate (map (cachedIface False iface_cache) imp_mods) >> - - -- process the imports - doImports iface_cache i_info us all_imps - - ) >>= \ (vals, tcs, unquals, fixes, errs, warns, _) -> - - return (vals, tcs, imp_mods, unquals, fixes, - errs, imp_warns `unionBags` warns) + if want_hiding + then + -- All imported; item_avails to be hidden + returnRn (total_avails, item_avails, emptyNameSet) + else + -- Just item_avails imported; nothing to be hidden + returnRn (item_avails, [], explicits) where - the_imps = implicit_prel ++ src_imps - all_imps = implicit_qprel ++ the_imps - - implicit_qprel = if opt_NoImplicitPrelude - then [{- no "import qualified Prelude" -}] - else [ImportDecl pRELUDE True Nothing Nothing prel_loc] + import_fm :: FiniteMap OccName AvailInfo + import_fm = listToFM [ (nameOccName name, avail) + | avail <- total_avails, + name <- availNames avail] + -- Even though availNames returns data constructors too, + -- they won't make any difference because naked entities like T + -- in an import list map to TcOccs, not VarOccs. + + bale_out item = addErrRn (badImportItemErr mod from item) `thenRn_` + returnRn [] + + get_item item@(IEModuleContents _) = bale_out item + + get_item item@(IEThingAll _) + = case check_item item of + Nothing -> bale_out item + Just avail@(AvailTC _ [n]) -> -- This occurs when you import T(..), but + -- only export T abstractly. The single [n] + -- in the AvailTC is the type or class itself + addWarnRn (dodgyImportWarn mod item) `thenRn_` + returnRn [(avail, [availName avail])] + Just avail -> returnRn [(avail, [availName avail])] + + get_item item@(IEThingAbs n) + | want_hiding -- hiding( C ) + -- Here the 'C' can be a data constructor *or* a type/class + = case catMaybes [check_item item, check_item (IEThingAbs data_n)] of + [] -> bale_out item + avails -> returnRn [(a, []) | a <- avails] + -- The 'explicits' list is irrelevant when hiding + where + data_n = setRdrNameOcc n (setOccNameSpace (rdrNameOcc n) dataName) - explicit_prelude_imp = not (null [ () | (ImportDecl mod qual _ _ _) <- src_imps, - mod == pRELUDE ]) + get_item item + = case check_item item of + Nothing -> bale_out item + Just avail -> returnRn [(avail, availNames avail)] - implicit_prel = if explicit_prelude_imp || opt_NoImplicitPrelude - then [{- no "import Prelude" -}] - else [ImportDecl pRELUDE False Nothing Nothing prel_loc] + check_item item + | not (maybeToBool maybe_in_import_avails) || + not (maybeToBool maybe_filtered_avail) + = Nothing - prel_imps -- WDP: Just guessing on this defn... ToDo - = [ imp | imp@(ImportDecl mod _ _ _ _) <- the_imps, fromPrelude mod ] + | otherwise + = Just filtered_avail + + where + wanted_occ = rdrNameOcc (ieName item) + maybe_in_import_avails = lookupFM import_fm wanted_occ - prel_loc = mkBuiltinSrcLoc + Just avail = maybe_in_import_avails + maybe_filtered_avail = filterAvail item avail + Just filtered_avail = maybe_filtered_avail +\end{code} - (uniq_imps, imp_dups) = removeDups cmp_mod the_imps - cmp_mod (ImportDecl m1 _ _ _ _) (ImportDecl m2 _ _ _ _) = cmpPString m1 m2 - qprel_imps = [ imp | imp@(ImportDecl mod True Nothing _ _) <- prel_imps ] - imp_mods = [ mod | ImportDecl mod _ _ _ _ <- uniq_imps ] - imp_warns = listToBag (map dupImportWarn imp_dups) - `unionBags` - listToBag (map qualPreludeImportWarn qprel_imps) +%************************************************************************ +%* * +\subsection{Qualifiying imports} +%* * +%************************************************************************ +@qualifyImports@ takes the @ExportEnv@ after filtering through the import spec +of an import decl, and deals with producing an @RnEnv@ with the +right qualified names. It also turns the @Names@ in the @ExportEnv@ into +fully fledged @Names@. -doImports iface_cache i_info us [] - = return (emptyBag, emptyBag, emptyBag, emptyBag, emptyBag, emptyBag, emptyBag) -doImports iface_cache i_info@(g_info,done_vals,done_tcs,imp_fn) us (imp:imps) - = doImport iface_cache i_info us1 imp - >>= \ (vals1, tcs1, unquals1, fixes1, errs1, warns1, imps1) -> +\begin{code} +qualifyImports :: ModuleName -- Imported module + -> Bool -- True <=> want unqualified import + -> Maybe ModuleName -- Optional "as M" part + -> [AvailInfo] -- What's to be hidden + -> (Name -> Provenance) + -> Avails -- Whats imported and how + -> RnMG (GlobalRdrEnv, ExportAvails) + +qualifyImports this_mod unqual_imp as_mod hides mk_provenance avails + = + -- Make the name environment. We're talking about a + -- single module here, so there must be no name clashes. + -- In practice there only ever will be if it's the module + -- being compiled. let - new_vals = [ (moduleNamePair rn, rn) | (_,rn) <- bagToList vals1, - not (maybeToBool (lookupFM done_vals (moduleNamePair rn))) ] - -- moduleNamePair computed twice - ext_vals = addListToFM done_vals new_vals - - new_tcs = [ (moduleNamePair rn, rn) | (_,rn) <- bagToList tcs1, - not (maybeToBool (lookupFM done_tcs (moduleNamePair rn))) ] - ext_tcs = addListToFM done_tcs new_tcs - in - doImports iface_cache (g_info,ext_vals,ext_tcs,imp_fn) us2 imps - >>= \ (vals2, tcs2, unquals2, fixes2, errs2, warns2, imps2) -> - return (vals1 `unionBags` vals2, - tcs1 `unionBags` tcs2, - unquals1 `unionBags` unquals2, - fixes1 `unionBags` fixes2, - errs1 `unionBags` errs2, - warns1 `unionBags` warns2, - imps1 `unionBags` imps2) - where - (us1, us2) = splitUniqSupply us - - -doImport :: IfaceCache - -> ImportNameInfo - -> UniqSupply - -> RdrNameImportDecl - -> IO (Bag (RdrName,RnName), -- values - Bag (RdrName,RnName), -- tycons/classes - Bag (Module,RnName), -- unqual imports - Bag RenamedFixityDecl, - Bag Error, - Bag Warning, - Bag (RnName,(ExportFlag,Bag SrcLoc))) -- import flags and src locs - -doImport iface_cache info us (ImportDecl mod qual maybe_as maybe_spec src_loc) - = cachedIface False iface_cache mod >>= \ maybe_iface -> - case maybe_iface of - Failed err -> - return (emptyBag, emptyBag, emptyBag, emptyBag, - unitBag err, emptyBag, emptyBag) - Succeeded iface -> - let - (b_vals, b_tcs, maybe_spec') = getBuiltins info mod maybe_spec - (ies, chk_ies, get_errs) = getOrigIEs iface maybe_spec' - in - doOrigIEs iface_cache info mod src_loc us ies - >>= \ (ie_vals, ie_tcs, imp_flags, errs, warns) -> - accumulate (map (checkOrigIE iface_cache) chk_ies) - >>= \ chk_errs_warns -> - let - final_vals = mapBag fst_occ b_vals `unionBags` mapBag pair_occ ie_vals - final_tcs = mapBag fst_occ b_tcs `unionBags` mapBag pair_occ ie_tcs - in - accumulate (map (getFixityDecl iface_cache) (bagToList final_vals)) - >>= \ fix_maybes_errs -> - let - (chk_errs, chk_warns) = unzip chk_errs_warns - (fix_maybes, fix_errs) = unzip fix_maybes_errs - - unquals = if qual then emptyBag - else mapBag pair_as (ie_vals `unionBags` ie_tcs) - - final_fixes = listToBag (catMaybes fix_maybes) - - final_errs = mapBag (\ err -> err mod src_loc) (unionManyBags (get_errs:chk_errs)) - `unionBags` errs `unionBags` unionManyBags fix_errs - final_warns = mapBag (\ warn -> warn mod src_loc) (unionManyBags chk_warns) - `unionBags` warns - imp_stuff = mapBag (\ (n,imp) -> (n,(imp,unitBag src_loc))) imp_flags - in - return (final_vals, final_tcs, unquals, final_fixes, - final_errs, final_warns, imp_stuff) - where - as_mod = case maybe_as of {Nothing -> mod; Just as_this -> as_this} - mk_occ str = if qual then Qual as_mod str else Unqual str - - fst_occ (str, rn) = (mk_occ str, rn) - pair_occ rn = (mk_occ (getLocalName rn), rn) - pair_as rn = (as_mod, rn) - + -- Add the things that are available + name_env1 = foldl add_avail emptyRdrEnv avails -getBuiltins _ mod maybe_spec - | not (fromPrelude mod) - = (emptyBag, emptyBag, maybe_spec) + -- Delete things that are hidden + name_env2 = foldl del_avail name_env1 hides -getBuiltins (((b_val_names,b_tc_names),_,_,_),_,_,_) mod maybe_spec - = case maybe_spec of - Nothing -> (all_vals, all_tcs, Nothing) - - Just (True, ies) -> -- hiding does not work for builtin names - (all_vals, all_tcs, maybe_spec) + -- Create the export-availability info + export_avails = mkExportAvails qual_mod unqual_imp name_env2 avails + in + returnRn (name_env2, export_avails) - Just (False, ies) -> let - (vals,tcs,ies_left) = do_builtin ies - in - (vals, tcs, Just (False, ies_left)) where - all_vals = do_all_builtin (fmToList b_val_names) - all_tcs = do_all_builtin (fmToList b_tc_names) + qual_mod = case as_mod of + Nothing -> this_mod + Just another_name -> another_name - do_all_builtin [] = emptyBag - do_all_builtin ((str,rn):rest) - = (str, rn) `consBag` do_all_builtin rest + add_avail :: GlobalRdrEnv -> AvailInfo -> GlobalRdrEnv + add_avail env avail = foldl add_name env (availNames avail) - do_builtin [] = (emptyBag,emptyBag,[]) - do_builtin (ie:ies) - = let str = unqual_str (ie_name ie) - in - case (lookupFM b_tc_names str) of -- NB: we favour the tycon/class FM... - Just rn -> case (ie,rn) of - (IEThingAbs _, WiredInTyCon tc) - -> (vals, (str, rn) `consBag` tcs, ies_left) - (IEThingAll _, WiredInTyCon tc) - -> (listToBag (map (\ id -> (getLocalName id, WiredInId id)) - (tyConDataCons tc)) - `unionBags` vals, - (str,rn) `consBag` tcs, ies_left) - _ -> panic "importing builtin names (1)" - - Nothing -> - case (lookupFM b_val_names str) of - Nothing -> (vals, tcs, ie:ies_left) - Just rn -> case (ie,rn) of - (IEVar _, WiredInId _) - -> ((str, rn) `consBag` vals, tcs, ies_left) - _ -> panic "importing builtin names (2)" - where - (vals, tcs, ies_left) = do_builtin ies + add_name env name + | unqual_imp = env2 + | otherwise = env1 + where + env1 = addOneToGlobalRdrEnv env (mkRdrQual qual_mod occ) (name,prov) + env2 = addOneToGlobalRdrEnv env1 (mkRdrUnqual occ) (name,prov) + occ = nameOccName name + prov = mk_provenance name + del_avail env avail = foldl delOneFromGlobalRdrEnv env rdr_names + where + rdr_names = map (mkRdrUnqual . nameOccName) (availNames avail) -getOrigIEs (ParsedIface _ _ _ _ _ _ exps _ _ _ _ _ _) Nothing -- import all - = (map mkAllIE (eltsFM exps), [], emptyBag) -getOrigIEs (ParsedIface _ _ _ _ _ _ exps _ _ _ _ _ _) (Just (True, ies)) -- import hiding - = (map mkAllIE (eltsFM exps_left), found_ies, errs) - where - (found_ies, errs) = lookupIEs exps ies - exps_left = delListFromFM exps (map (getLocalName.ie_name.fst) found_ies) +mkEmptyExportAvails :: ModuleName -> ExportAvails +mkEmptyExportAvails mod_name = (unitFM mod_name [], emptyUFM) -getOrigIEs (ParsedIface _ _ _ _ _ _ exps _ _ _ _ _ _) (Just (False, ies)) -- import these - = (map fst found_ies, found_ies, errs) +mkExportAvails :: ModuleName -> Bool -> GlobalRdrEnv -> [AvailInfo] -> ExportAvails +mkExportAvails mod_name unqual_imp name_env avails + = (mod_avail_env, entity_avail_env) where - (found_ies, errs) = lookupIEs exps ies - - -mkAllIE (orig,ExportAbs) - = ASSERT(isLexCon (getLocalName orig)) - IEThingAbs orig -mkAllIE (orig, ExportAll) - | isLexCon (getLocalName orig) - = IEThingAll orig - | otherwise - = IEVar orig - - -lookupIEs exps [] - = ([], emptyBag) -lookupIEs exps (ie:ies) - = case lookupFM exps (unqual_str (ie_name ie)) of - Nothing -> - (orig_ies, unknownImpSpecErr ie `consBag` errs) - Just (orig,flag) -> - (orig_ie orig flag ie ++ orig_ies, - adderr_if (seen_ie orig orig_ies) (duplicateImpSpecErr ie) errs) - where - (orig_ies, errs) = lookupIEs exps ies + mod_avail_env = unitFM mod_name unqual_avails - orig_ie orig flag (IEVar n) = [(IEVar orig, flag)] - orig_ie orig flag (IEThingAbs n) = [(IEThingAbs orig, flag)] - orig_ie orig flag (IEThingAll n) = [(IEThingAll orig, flag)] - orig_ie orig flag (IEThingWith n ns) = [(IEThingWith orig ns, flag)] + -- unqual_avails is the Avails that are visible in *unqualfied* form + -- (1.4 Report, Section 5.1.1) + -- For example, in + -- import T hiding( f ) + -- we delete f from avails - seen_ie orig seen_ies = any (\ (ie,_) -> orig == ie_name ie) seen_ies + unqual_avails | not unqual_imp = [] -- Short cut when no unqualified imports + | otherwise = mapMaybe prune avails + prune (Avail n) | unqual_in_scope n = Just (Avail n) + prune (Avail n) | otherwise = Nothing + prune (AvailTC n ns) | null uqs = Nothing + | otherwise = Just (AvailTC n uqs) + where + uqs = filter unqual_in_scope ns -doOrigIEs iface_cache info mod src_loc us [] - = return (emptyBag,emptyBag,emptyBag,emptyBag,emptyBag) + unqual_in_scope n = unQualInScope name_env n -doOrigIEs iface_cache info mod src_loc us (ie:ies) - = doOrigIE iface_cache info mod src_loc us1 ie - >>= \ (vals1, tcs1, imps1, errs1, warns1) -> - doOrigIEs iface_cache info mod src_loc us2 ies - >>= \ (vals2, tcs2, imps2, errs2, warns2) -> - return (vals1 `unionBags` vals2, - tcs1 `unionBags` tcs2, - imps1 `unionBags` imps2, - errs1 `unionBags` errs2, - warns1 `unionBags` warns2) - where - (us1, us2) = splitUniqSupply us - -doOrigIE iface_cache info mod src_loc us ie - = with_decl iface_cache (ie_name ie) - (\ err -> (emptyBag, emptyBag, emptyBag, unitBag err, emptyBag)) - (\ decl -> case initRn True mod emptyRnEnv us - (setExtraRn info $ - pushSrcLocRn src_loc $ - getIfaceDeclNames ie decl) - of - ((vals, tcs, imps), errs, warns) -> (vals, tcs, imps, errs, warns)) - -checkOrigIE iface_cache (IEThingAll n, ExportAbs) - = with_decl iface_cache n - (\ err -> (unitBag (\ mod locn -> err), emptyBag)) - (\ decl -> case decl of - TypeSig _ _ _ -> (emptyBag, unitBag (allWhenSynImpSpecWarn n)) - other -> (unitBag (allWhenAbsImpSpecErr n), emptyBag)) - -checkOrigIE iface_cache (IEThingWith n ns, ExportAbs) - = return (unitBag (withWhenAbsImpSpecErr n), emptyBag) - -checkOrigIE iface_cache (IEThingWith n ns, ExportAll) - = with_decl iface_cache n - (\ err -> (unitBag (\ mod locn -> err), emptyBag)) - (\ decl -> case decl of - NewTypeSig _ con _ _ -> (check_with "constructrs" [con] ns, emptyBag) - DataSig _ cons fields _ _ -> (check_with "constructrs (and fields)" (cons++fields) ns, emptyBag) - ClassSig _ ops _ _ -> (check_with "class ops" ops ns, emptyBag)) - where - check_with str has rdrs - | sortLt (<) (map getLocalName has) == sortLt (<) (map unqual_str rdrs) - = emptyBag - | otherwise - = unitBag (withImpSpecErr str n has rdrs) + entity_avail_env = listToUFM [ (name,avail) | avail <- avails, + name <- availNames avail] -checkOrigIE iface_cache other - = return (emptyBag, emptyBag) +plusExportAvails :: ExportAvails -> ExportAvails -> ExportAvails +plusExportAvails (m1, e1) (m2, e2) + = (plusFM_C (++) m1 m2, plusAvailEnv e1 e2) + -- ToDo: wasteful: we do this once for each constructor! +\end{code} -with_decl iface_cache n do_err do_decl - = cachedDecl iface_cache (isRdrLexCon n) n >>= \ maybe_decl -> - case maybe_decl of - Failed err -> return (do_err err) - Succeeded decl -> return (do_decl decl) +%************************************************************************ +%* * +\subsection{Export list processing} +%* * +%************************************************************************ +Processing the export list. -getFixityDecl iface_cache (_,rn) - = let - (mod, str) = moduleNamePair rn - in - cachedIface True iface_cache mod >>= \ maybe_iface -> - case maybe_iface of - Failed err -> - return (Nothing, unitBag err) - Succeeded (ParsedIface _ _ _ _ _ _ _ _ fixes _ _ _ _) -> - case lookupFM fixes str of - Nothing -> return (Nothing, emptyBag) - Just (InfixL _ i) -> return (Just (InfixL rn i), emptyBag) - Just (InfixR _ i) -> return (Just (InfixR rn i), emptyBag) - Just (InfixN _ i) -> return (Just (InfixN rn i), emptyBag) - -ie_name (IEVar n) = n -ie_name (IEThingAbs n) = n -ie_name (IEThingAll n) = n -ie_name (IEThingWith n _) = n - -unqual_str (Unqual str) = str -unqual_str q@(Qual _ _) = panic "unqual_str" - -adderr_if True err errs = err `consBag` errs -adderr_if False err errs = errs -\end{code} +You might think that we should record things that appear in the export list +as ``occurrences'' (using @addOccurrenceName@), but you'd be wrong. +We do check (here) that they are in scope, +but there is no need to slurp in their actual declaration +(which is what @addOccurrenceName@ forces). -********************************************************* -* * -\subsection{Actually creating the imported names} -* * -********************************************************* +Indeed, doing so would big trouble when +compiling @PrelBase@, because it re-exports @GHC@, which includes @takeMVar#@, +whose type includes @ConcBase.StateAndSynchVar#@, and so on... \begin{code} -getIfaceDeclNames :: RdrNameIE -> RdrIfaceDecl - -> RnM_IInfo s (Bag RnName, -- values - Bag RnName, -- tycons/classes - Bag (RnName,ExportFlag)) -- import flags - -getIfaceDeclNames ie (ValSig val src_loc _) - = newImportedName False src_loc Nothing Nothing val `thenRn` \ val_name -> - returnRn (unitBag (RnName val_name), - emptyBag, - unitBag (RnName val_name, ExportAll)) - -getIfaceDeclNames ie (TypeSig tycon src_loc _) - = newImportedName True src_loc Nothing Nothing tycon `thenRn` \ tycon_name -> - returnRn (emptyBag, - unitBag (RnSyn tycon_name), - unitBag (RnSyn tycon_name, ExportAll)) - -getIfaceDeclNames ie (NewTypeSig tycon con src_loc _) - = newImportedName True src_loc Nothing Nothing tycon `thenRn` \ tycon_name -> - newImportedName False src_loc (Just (nameExportFlag tycon_name)) - (Just (nameImportFlag tycon_name)) - con `thenRn` \ con_name -> - returnRn (if imp_all (imp_flag ie) then - unitBag (RnConstr con_name tycon_name) - else - emptyBag, - unitBag (RnData tycon_name [con_name] []), - unitBag (RnData tycon_name [con_name] [], imp_flag ie)) - -getIfaceDeclNames ie (DataSig tycon cons fields src_loc _) - = newImportedName True src_loc Nothing Nothing tycon `thenRn` \ tycon_name -> - mapRn (newImportedName False src_loc (Just (nameExportFlag tycon_name)) - (Just (nameImportFlag tycon_name))) - cons `thenRn` \ con_names -> - mapRn (newImportedName False src_loc (Just (nameExportFlag tycon_name)) - (Just (nameImportFlag tycon_name))) - fields `thenRn` \ field_names -> +type ExportAccum -- The type of the accumulating parameter of + -- the main worker function in exportsFromAvail + = ([ModuleName], -- 'module M's seen so far + ExportOccMap, -- Tracks exported occurrence names + AvailEnv) -- The accumulated exported stuff, kept in an env + -- so we can common-up related AvailInfos + +type ExportOccMap = FiniteMap OccName (Name, RdrNameIE) + -- Tracks what a particular exported OccName + -- in an export list refers to, and which item + -- it came from. It's illegal to export two distinct things + -- that have the same occurrence name + + +exportsFromAvail :: ModuleName + -> Maybe [RdrNameIE] -- Export spec + -> ExportAvails + -> GlobalRdrEnv + -> RnMG Avails + -- Complains if two distinct exports have same OccName + -- Warns about identical exports. + -- Complains about exports items not in scope +exportsFromAvail this_mod Nothing export_avails global_name_env + = exportsFromAvail this_mod true_exports export_avails global_name_env + where + true_exports = Just $ if this_mod == mAIN_Name + then [IEVar main_RDR_Unqual] + -- export Main.main *only* unless otherwise specified, + else [IEModuleContents this_mod] + -- but for all other modules export everything. + +exportsFromAvail this_mod (Just export_items) + (mod_avail_env, entity_avail_env) + global_name_env + = doptRn Opt_WarnDuplicateExports `thenRn` \ warn_dup_exports -> + foldlRn (exports_from_item warn_dup_exports) + ([], emptyFM, emptyAvailEnv) export_items + `thenRn` \ (_, _, export_avail_map) -> let - rn_tycon = RnData tycon_name con_names field_names - rn_constrs = [ RnConstr name tycon_name | name <- con_names ] - rn_fields = [ RnField name tycon_name | name <- field_names ] + export_avails :: [AvailInfo] + export_avails = nameEnvElts export_avail_map in - returnRn (if imp_all (imp_flag ie) then - listToBag rn_constrs `unionBags` listToBag rn_fields - else - emptyBag, - unitBag rn_tycon, - unitBag (rn_tycon, imp_flag ie)) - -getIfaceDeclNames ie (ClassSig cls ops src_loc _) - = newImportedName True src_loc Nothing Nothing cls `thenRn` \ cls_name -> - mapRn (newImportedName False src_loc (Just (nameExportFlag cls_name)) - (Just (nameImportFlag cls_name))) - ops `thenRn` \ op_names -> - returnRn (if imp_all (imp_flag ie) then - listToBag (map (\ n -> RnClassOp n cls_name) op_names) - else - emptyBag, - unitBag (RnClass cls_name op_names), - unitBag (RnClass cls_name op_names, imp_flag ie)) - - -imp_all ExportAll = True -imp_all _ = False - -imp_flag (IEThingAbs _) = ExportAbs -imp_flag (IEThingAll _) = ExportAll -imp_flag (IEThingWith _ _) = ExportAll -\end{code} + returnRn export_avails -********************************************************* -* * -\subsection{Creating a new imported name} -* * -********************************************************* - -\begin{code} -newImportedName :: Bool -- True => tycon or class - -> SrcLoc - -> Maybe ExportFlag -- maybe export flag - -> Maybe ExportFlag -- maybe import flag - -> RdrName -- orig name - -> RnM_IInfo s Name - -newImportedName tycon_or_class locn maybe_exp maybe_imp rdr - = getExtraRn `thenRn` \ ((_,b_keys,exp_fn,occ_fn),done_vals,done_tcs,imp_fn) -> - case if tycon_or_class - then lookupFM done_tcs (moduleNamePair rdr) - else lookupFM done_vals (moduleNamePair rdr) - of - Just rn -> returnRn (getName rn) - Nothing -> - rnGetUnique `thenRn` \ u -> - let - uniq = case rdr of - Qual m n -> u - Unqual n -> case lookupFM b_keys n of - Nothing -> u - Just (key,_) -> key - - exp = case maybe_exp of - Just exp -> exp - Nothing -> exp_fn n - - imp = case maybe_imp of - Just imp -> imp - Nothing -> imp_flag - - (imp_flag, imp_locs) = imp_fn n - - n = mkImportedName uniq rdr imp locn imp_locs exp (occ_fn n) -- NB: two "n"s - in - returnRn n + where + exports_from_item :: Bool -> ExportAccum -> RdrNameIE -> RnMG ExportAccum + + exports_from_item warn_dups acc@(mods, occs, avails) ie@(IEModuleContents mod) + | mod `elem` mods -- Duplicate export of M + = warnCheckRn warn_dups (dupModuleExport mod) `thenRn_` + returnRn acc + + | otherwise + = case lookupFM mod_avail_env mod of + Nothing -> failWithRn acc (modExportErr mod) + Just mod_avails -> foldlRn (check_occs ie) occs mod_avails + `thenRn` \ occs' -> + let + avails' = foldl addAvail avails mod_avails + in + returnRn (mod:mods, occs', avails') + + exports_from_item warn_dups acc@(mods, occs, avails) ie + = lookupSrcName global_name_env (ieName ie) `thenRn` \ name -> + + -- See what's available in the current environment + case lookupUFM entity_avail_env name of { + Nothing -> -- Presumably this happens because lookupSrcName didn't find + -- the name and returned an unboundName, which won't be in + -- the entity_avail_env, of course + WARN( not (isUnboundName name), ppr name ) + returnRn acc ; + + Just avail -> + + -- Filter out the bits we want + case filterAvail ie avail of { + Nothing -> -- Not enough availability + failWithRn acc (exportItemErr ie) ; + + Just export_avail -> + + -- Phew! It's OK! Now to check the occurrence stuff! + warnCheckRn (ok_item ie avail) (dodgyExportWarn ie) `thenRn_` + check_occs ie occs export_avail `thenRn` \ occs' -> + returnRn (mods, occs', addAvail avails export_avail) + }} + + + +ok_item (IEThingAll _) (AvailTC _ [n]) = False + -- This occurs when you import T(..), but + -- only export T abstractly. The single [n] + -- in the AvailTC is the type or class itself +ok_item _ _ = True + +check_occs :: RdrNameIE -> ExportOccMap -> AvailInfo -> RnMG ExportOccMap +check_occs ie occs avail + = doptRn Opt_WarnDuplicateExports `thenRn` \ warn_dup_exports -> + foldlRn (check warn_dup_exports) occs (availNames avail) + where + check warn_dup occs name + = case lookupFM occs name_occ of + Nothing -> returnRn (addToFM occs name_occ (name, ie)) + Just (name', ie') + | name == name' -> -- Duplicate export + warnCheckRn warn_dup + (dupExportWarn name_occ ie ie') + `thenRn_` returnRn occs + + | otherwise -> -- Same occ name but different names: an error + failWithRn occs (exportClashErr name_occ ie ie') + where + name_occ = nameOccName name \end{code} +%************************************************************************ +%* * +\subsection{Errors} +%* * +%************************************************************************ + \begin{code} -globalDupNamesErr rdr rns sty - = ppAboves (message : map pp_dup rns) +badImportItemErr mod from ie + = sep [ptext SLIT("Module"), quotes (ppr mod), source_import, + ptext SLIT("does not export"), quotes (ppr ie)] where - message = ppBesides [ppStr "multiple declarations of `", pprNonSym sty rdr, ppStr "'"] - - pp_dup rn = addShortErrLocLine (get_loc rn) (\ sty -> - ppBesides [pp_descrip rn, pprNonSym sty rn]) sty - - get_loc rn = case getImpLocs rn of - [] -> getSrcLoc rn - locs -> head locs - - pp_descrip (RnName _) = ppStr "a value" - pp_descrip (RnSyn _) = ppStr "a type synonym" - pp_descrip (RnData _ _ _) = ppStr "a data type" - pp_descrip (RnConstr _ _) = ppStr "a data constructor" - pp_descrip (RnField _ _) = ppStr "a record field" - pp_descrip (RnClass _ _) = ppStr "a class" - pp_descrip (RnClassOp _ _) = ppStr "a class method" - pp_descrip _ = ppNil - -dupImportWarn (ImportDecl m1 _ _ _ locn1 : dup_imps) sty - = ppAboves (item1 : map dup_item dup_imps) + source_import = case from of + ImportByUserSource -> ptext SLIT("(hi-boot interface)") + other -> empty + +dodgyImportWarn mod item = dodgyMsg (ptext SLIT("import")) item +dodgyExportWarn item = dodgyMsg (ptext SLIT("export")) item + +dodgyMsg kind item@(IEThingAll tc) + = sep [ ptext SLIT("The") <+> kind <+> ptext SLIT("item") <+> quotes (ppr item), + ptext SLIT("suggests that") <+> quotes (ppr tc) <+> ptext SLIT("has constructor or class methods"), + ptext SLIT("but it has none; it is a type synonym or abstract type or class") ] + +modExportErr mod + = hsep [ ptext SLIT("Unknown module in export list: module"), quotes (ppr mod)] + +exportItemErr export_item + = sep [ ptext SLIT("The export item") <+> quotes (ppr export_item), + ptext SLIT("attempts to export constructors or class methods that are not visible here") ] + +exportClashErr occ_name ie1 ie2 + = hsep [ptext SLIT("The export items"), quotes (ppr ie1) + ,ptext SLIT("and"), quotes (ppr ie2) + ,ptext SLIT("create conflicting exports for"), quotes (ppr occ_name)] + +dupDeclErr (n:ns) + = vcat [ptext SLIT("Multiple declarations of") <+> quotes (ppr n), + nest 4 (vcat (map ppr sorted_locs))] where - item1 = addShortErrLocLine locn1 (\ sty -> - ppCat [ppStr "multiple imports from module", ppPStr m1]) sty - - dup_item (ImportDecl m _ _ _ locn) - = addShortErrLocLine locn (\ sty -> - ppCat [ppStr "here was another import from module", ppPStr m]) sty - -qualPreludeImportWarn (ImportDecl m _ _ _ locn) - = addShortErrLocLine locn (\ sty -> - ppCat [ppStr "qualified import of prelude module", ppPStr m]) - -unknownImpSpecErr ie imp_mod locn - = addShortErrLocLine locn (\ sty -> - ppBesides [ppStr "module ", ppPStr imp_mod, ppStr " does not export `", ppr sty (ie_name ie), ppStr "'"]) - -duplicateImpSpecErr ie imp_mod locn - = addShortErrLocLine locn (\ sty -> - ppBesides [ppStr "`", ppr sty (ie_name ie), ppStr "' already seen in import list"]) - -allWhenSynImpSpecWarn n imp_mod locn - = addShortErrLocLine locn (\ sty -> - ppBesides [ppStr "type synonym `", ppr sty n, ppStr "' should not be imported with (..)"]) - -allWhenAbsImpSpecErr n imp_mod locn - = addShortErrLocLine locn (\ sty -> - ppBesides [ppStr "module ", ppPStr imp_mod, ppStr " only exports `", ppr sty n, ppStr "' abstractly"]) - -withWhenAbsImpSpecErr n imp_mod locn - = addShortErrLocLine locn (\ sty -> - ppBesides [ppStr "module ", ppPStr imp_mod, ppStr " only exports `", ppr sty n, ppStr "' abstractly"]) - -withImpSpecErr str n has ns imp_mod locn - = addErrLoc locn "" (\ sty -> - ppAboves [ ppBesides [ppStr "inconsistent list of", ppStr str, ppStr "in import list for `", ppr sty n, ppStr "'"], - ppCat [ppStr " expected:", ppInterleave ppComma (map (ppr sty) has)], - ppCat [ppStr " found: ", ppInterleave ppComma (map (ppr sty) ns)] ]) - -dupFieldErr con locn (dup:rest) - = addShortErrLocLine locn (\ sty -> - ppBesides [ppStr "record field `", ppr sty dup, ppStr "declared multiple times in `", ppr sty con, ppStr "'"]) + sorted_locs = sortLt occ'ed_before (map nameSrcLoc (n:ns)) + occ'ed_before a b = LT == compare a b + +dupExportWarn occ_name ie1 ie2 + = hsep [quotes (ppr occ_name), + ptext SLIT("is exported by"), quotes (ppr ie1), + ptext SLIT("and"), quotes (ppr ie2)] + +dupModuleExport mod + = hsep [ptext SLIT("Duplicate"), + quotes (ptext SLIT("Module") <+> ppr mod), + ptext SLIT("in export list")] \end{code}