X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnNames.lhs;h=877974c87f48afe41fb64e0a121e56880d08290f;hb=9bedea20f62a1da832c69833c39dd1d15e6ee9a3;hp=27dd750a394d03e35387a4114c3d501e16fd21e7;hpb=ca5a4a480d10d61e5b7a52eb4d556e8b8c33e69d;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnNames.lhs b/ghc/compiler/rename/RnNames.lhs index 27dd750..877974c 100644 --- a/ghc/compiler/rename/RnNames.lhs +++ b/ghc/compiler/rename/RnNames.lhs @@ -1,831 +1,676 @@ % -% (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 ( DynFlags, DynFlag(..), dopt, opt_NoImplicitPrelude ) -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(..), + 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 ) -\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) +import RdrHsSyn ( RdrNameIE, RdrNameImportDecl, + RdrNameHsModule, RdrNameHsDecl + ) +import RnIfaces ( getInterfaceExports, getDeclBinders, + recordLocalSlurps, checkModUsage, + outOfDate, findAndReadIface ) +import RnEnv +import RnMonad - (src_env, src_dups) = extendGlobalRnEnv emptyRnEnv unqual_vals unqual_tcs - (all_env, imp_dups) = extendGlobalRnEnv src_env (bagToList imp_vals) (bagToList imp_tcs) +import FiniteMap +import PrelNames ( pRELUDE_Name, mAIN_Name, main_RDR ) +import UniqFM ( lookupUFM ) +import Bag ( bagToList ) +import Module ( ModuleName, mkModuleInThisPackage, WhereFrom(..) ) +import NameSet +import Name ( Name, nameSrcLoc, + setLocalNameSort, nameOccName, nameEnvElts ) +import HscTypes ( Provenance(..), ImportReason(..), GlobalRdrEnv, + GenAvailInfo(..), AvailInfo, Avails, AvailEnv ) +import RdrName ( RdrName, rdrNameOcc, setRdrNameOcc, mkRdrQual, mkRdrUnqual, + isQual, isUnqual ) +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} - -- remove dups of the same imported thing - diff_imp_dups = filterBag diff_orig imp_dups - diff_orig (_,rn1,rn2) = origName rn1 /= origName rn2 - 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]) - 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) - } - where - (us1, us2) = splitUniqSupply us -\end{code} - -********************************************************* -* * -\subsection{Top-level source names} -* * -********************************************************* +%************************************************************************ +%* * +\subsection{Get global names} +%* * +%************************************************************************ \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] - in - returnRn (rn_tycon, listToBag rn_constrs, listToBag rn_fields) +getGlobalNames :: RdrNameHsModule + -> RnMG (Maybe (GlobalRdrEnv, -- Maps all in-scope things + GlobalRdrEnv, -- Maps just *local* things + Avails, -- The exported stuff + AvailEnv, -- Maps a name to its parent AvailInfo + -- Just for in-scope things only + Maybe ParsedIface -- The old interface file, if any + )) + -- Nothing => no need to recompile + +getGlobalNames (HsModule this_mod _ exports imports decls _ mod_loc) + = -- These two fix-loops are to get the right + -- provenance information into a Name + fixRn ( \ ~(Just (rec_gbl_env, _, rec_export_avails, _, _)) -> -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) - -getTyDeclNames (TySynonym tycon _ _ src_loc) - = newGlobalName src_loc Nothing tycon `thenRn` \ tycon_name -> - returnRn (RnSyn tycon_name, emptyBag, emptyBag) + let + rec_unqual_fn :: Name -> Bool -- Is this chap in scope unqualified? + rec_unqual_fn = unQualInScope rec_gbl_env + rec_exp_fn :: Name -> Bool + rec_exp_fn = mk_export_fn (availsToNameSet rec_export_avails) + in -getConFieldNames exp constrs fields have [] - = returnRn (bagToList constrs, bagToList fields) + -- PROCESS LOCAL DECLS + -- Do these *first* so that the correct provenance gets + -- into the global name cache. + importsFromLocalDecls this_mod rec_exp_fn decls + `thenRn` \ (local_gbl_env, local_mod_avails) -> -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 + -- PROCESS IMPORT DECLS + -- Do the non {- SOURCE -} ones first, so that we get a helpful + -- warning for {- SOURCE -} ones that are unnecessary + let + (source, ordinary) = partition is_source_import all_imports + is_source_import (ImportDecl _ ImportByUserSource _ _ _ _) = True + is_source_import other = False + in + mapAndUnzipRn (importsFromImportDecl rec_unqual_fn) ordinary + `thenRn` \ (imp_gbl_envs1, imp_avails_s1) -> + mapAndUnzipRn (importsFromImportDecl rec_unqual_fn) source + `thenRn` \ (imp_gbl_envs2, imp_avails_s2) -> + + -- 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 -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_avails :: ExportAvails + all_avails = foldr plusExportAvails local_mod_avails (imp_avails_s2 ++ imp_avails_s1) + (_, global_avail_env) = all_avails + in -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 - in - getConFieldNames exp all_constrs all_fields new_have rest + -- TRY FOR EARLY EXIT + -- We can't go for an early exit before this because we have to check + -- for name clashes. Consider: + -- + -- module A where module B where + -- import B h = True + -- f = h + -- + -- Suppose I've compiled everything up, and then I add a + -- new definition to module B, that defines "f". + -- + -- Then I must detect the name clash in A before going for an early + -- exit. The early-exit code checks what's actually needed from B + -- to compile A, and of course that doesn't include B.f. That's + -- why we wait till after the plusEnv stuff to do the early-exit. + + -- Check For eacly exit + checkErrsRn `thenRn` \ no_errs_so_far -> + if not no_errs_so_far then + -- Found errors already, so exit now + returnRn Nothing + else + checkEarlyExit this_mod `thenRn` \ (up_to_date, old_iface) -> + if up_to_date then + -- Interface files are sufficiently unchanged + putDocRn (text "Compilation IS NOT required") `thenRn_` + returnRn Nothing + else + + -- PROCESS EXPORT LISTS + exportsFromAvail this_mod exports all_avails gbl_env `thenRn` \ export_avails -> + + + -- ALL DONE + returnRn (Just (gbl_env, local_gbl_env, export_avails, global_avail_env, old_iface)) + ) 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 - -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)) - -getClassOpNames exp [] - = 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 + all_imports = prel_imports ++ imports + + -- 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. + prel_imports | this_mod == pRELUDE_Name || + explicit_prelude_import || + opt_NoImplicitPrelude + = [] + + | 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} +checkEarlyExit mod_name + = traceRn (text "Considering whether compilation is required...") `thenRn_` -********************************************************* -* * -\subsection{Bindings} -* * -********************************************************* + -- Read the old interface file, if any, for the module being compiled + findAndReadIface doc_str mod_name False {- Not hi-boot -} `thenRn` \ maybe_iface -> -\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)) + -- CHECK WHETHER WE HAVE IT ALREADY + case maybe_iface of + Left err -> -- Old interface file not found, so we'd better bail out + traceRn (vcat [ptext SLIT("No old interface file for") <+> ppr mod_name, + err]) `thenRn_` + returnRn (outOfDate, Nothing) + + Right iface + | panic "checkEarlyExit: ???: not opt_SourceUnchanged" + -> -- Source code changed + traceRn (nest 4 (text "source file changed or recompilation check turned off")) `thenRn_` + returnRn (False, Just iface) + + | otherwise + -> -- Source code unchanged and no errors yet... carry on + checkModUsage (pi_usages iface) `thenRn` \ up_to_date -> + returnRn (up_to_date, Just iface) + where + -- Only look in current directory, with suffix .hi + doc_str = sep [ptext SLIT("need usage info from"), ppr mod_name] \end{code} + +\begin{code} +importsFromImportDecl :: (Name -> Bool) -- OK to omit qualifier + -> RdrNameImportDecl + -> RnMG (GlobalRdrEnv, + ExportAvails) -********************************************************* -* * -\subsection{Creating a new global name} -* * -********************************************************* +importsFromImportDecl is_unqual (ImportDecl imp_mod_name from qual_only as_mod import_spec iloc) + = pushSrcLocRn iloc $ + getInterfaceExports imp_mod_name from `thenRn` \ (imp_mod, avails) -> -\begin{code} -newGlobalName :: SrcLoc -> Maybe ExportFlag - -> RdrName -> RnM_Info s Name + if null avails 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 --- ToDo: b_names and b_keys being defined in this module !!! + filterImports imp_mod_name import_spec avails `thenRn` \ (filtered_avails, hides, explicits) -> -newGlobalName locn maybe_exp rdr - = getExtraRn `thenRn` \ (_,b_keys,exp_fn,occ_fn) -> - getModuleRn `thenRn` \ mod -> - rnGetUnique `thenRn` \ u -> 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) + mk_provenance name = NonLocalDef (UserImport imp_mod iloc (name `elemNameSet` explicits)) + (is_unqual name) in - addWarnIfRn (rdr == Unqual SLIT("negate")) (negateNameWarn (rdr, locn)) `thenRn_` - addErrIfRn (isQual rdr) (qualNameErr "name in definition" (rdr, locn)) `thenRn_` - returnRn n + + qualifyImports imp_mod_name + (not qual_only) -- Maybe want unqualified names + as_mod hides + mk_provenance + filtered_avails \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) +importsFromLocalDecls mod_name rec_exp_fn decls + = mapRn (getLocalDeclBinders mod rec_exp_fn) decls `thenRn` \ avails_s -> - 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) + let + avails = concat avails_s - i_info = (g_info, emptyFM, emptyFM, rec_imp_fn) - in - doImports iface_cache i_info us all_imps - ) >>= \ (vals, tcs, unquals, fixes, errs, warns, _) -> + all_names :: [Name] -- All the defns; no dups eliminated + all_names = [name | avail <- avails, name <- availNames avail] - return (vals, tcs, imp_mods, unquals, fixes, - errs, imp_warns `unionBags` warns) + dups :: [[Name]] + (_, dups) = removeDups compare all_names + in + -- Check for duplicate definitions + mapRn_ (addErrRn . dupDeclErr) dups `thenRn_` + + -- Record that locally-defined things are available + recordLocalSlurps avails `thenRn_` + + -- Build the environment + qualifyImports mod_name + True -- Want unqualified names + Nothing -- no 'as M' + [] -- Hide nothing + (\n -> LocalDef) -- Provenance is local + avails where - (src_qprels, ok_imps) = partition qual_prel src_imps - the_imps = ok_imps ++ prel_imp - all_imps = the_imps ++ qprel_imp + mod = mkModuleInThisPackage mod_name - qual_prel (ImportDecl mod qual imp_as _ _) - = fromPrelude mod && qual && not (maybeToBool imp_as) - - explicit_prelude_import - = null [() | (ImportDecl mod qual _ _ _) <- ok_imps, fromPrelude mod] - - qprel_imp = if opt_NoImplicitPrelude - then [{-the flag really means it: *NO* implicit "import Prelude" -}] - else [ImportDecl pRELUDE True Nothing Nothing prel_loc] - - prel_imp = if not explicit_prelude_import || opt_NoImplicitPrelude - then - [{- no "import Prelude" -}] - else - [ImportDecl pRELUDE False Nothing Nothing prel_loc] - - prel_loc = mkBuiltinSrcLoc +getLocalDeclBinders :: Module + -> (Name -> Bool) -- Is-exported predicate + -> RdrNameHsDecl -> RnMG Avails +getLocalDeclBinders mod rec_exp_fn (ValD binds) + = mapRn do_one (bagToList (collectTopBinders binds)) + where + do_one (rdr_name, loc) = newLocalName mod rec_exp_fn rdr_name loc `thenRn` \ name -> + returnRn (Avail name) + +getLocalDeclBinders mod rec_exp_fn decl + = getDeclBinders (newLocalName mod rec_exp_fn) decl `thenRn` \ maybe_avail -> + case maybe_avail of + Nothing -> returnRn [] -- Instance decls and suchlike + Just avail -> returnRn [avail] + +newLocalName mod rec_exp_fn rdr_name loc + = check_unqual rdr_name loc `thenRn_` + newTopBinder mod rdr_name loc `thenRn` \ name -> + returnRn (setLocalNameSort name (rec_exp_fn name)) + where + -- There should never be a qualified name in a binding position (except in instance decls) + -- The parser doesn't check this because the same parser parses instance decls + check_unqual rdr_name loc + | isUnqual rdr_name = returnRn () + | otherwise = qualNameErr (text "the binding for" <+> quotes (ppr rdr_name)) + (rdr_name,loc) +\end{code} - (uniq_imps, imp_dups) = removeDups cmp_mod the_imps - cmp_mod (ImportDecl m1 _ _ _ _) (ImportDecl m2 _ _ _ _) = cmpPString m1 m2 - imp_mods = [ mod | ImportDecl mod _ _ _ _ <- uniq_imps ] - imp_warns = listToBag (map dupImportWarn imp_dups) - `unionBags` - listToBag (map qualPreludeImportWarn src_qprels) +%************************************************************************ +%* * +\subsection{Filtering imports} +%* * +%************************************************************************ +@filterImports@ takes the @ExportEnv@ telling what the imported module makes +available, and filters it through the import spec (if any). -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} +filterImports :: ModuleName -- The module being imported + -> 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 Nothing imports + = returnRn (imports, [], emptyNameSet) + +filterImports mod (Just (want_hiding, import_items)) avails + = flatMapRn get_item import_items `thenRn` \ avails_w_explicits -> 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 + (item_avails, explicits_s) = unzip avails_w_explicits + explicits = foldl addListToNameSet emptyNameSet explicits_s 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) + if want_hiding + then + -- All imported; item_avails to be hidden + returnRn (avails, item_avails, emptyNameSet) + else + -- Just item_avails imported; nothing to be hidden + returnRn (item_avails, [], explicits) 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 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 -> - accumulate (map (getFixityDecl iface_cache) (bagToList ie_vals)) - >>= \ fix_maybes_errs -> - let - (chk_errs, chk_warns) = unzip chk_errs_warns - (fix_maybes, fix_errs) = unzip fix_maybes_errs + import_fm :: FiniteMap OccName AvailInfo + import_fm = listToFM [ (nameOccName name, avail) + | avail <- 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 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) - 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 + get_item item + = case check_item item of + Nothing -> bale_out item + Just avail -> returnRn [(avail, availNames avail)] - unquals = if qual then emptyBag - else mapBag pair_as (ie_vals `unionBags` ie_tcs) + check_item item + | not (maybeToBool maybe_in_import_avails) || + not (maybeToBool maybe_filtered_avail) + = Nothing + + | otherwise + = Just filtered_avail + + where + wanted_occ = rdrNameOcc (ieName item) + maybe_in_import_avails = lookupFM import_fm wanted_occ + + Just avail = maybe_in_import_avails + maybe_filtered_avail = filterAvail item avail + Just filtered_avail = maybe_filtered_avail +\end{code} - 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) +%************************************************************************ +%* * +\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@. -getBuiltins _ mod maybe_spec - | not (fromPrelude mod) - = (emptyBag, emptyBag, maybe_spec) +\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 + -- Add the things that are available + name_env1 = foldl add_avail emptyRdrEnv avails -getBuiltins (((b_val_names,b_tc_names),_,_,_),_,_,_) mod maybe_spec - = case maybe_spec of - Nothing -> (all_vals, all_tcs, Nothing) + -- Delete things that are hidden + name_env2 = foldl del_avail name_env1 hides - 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) - 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) +mkExportAvails :: ModuleName -> Bool -> GlobalRdrEnv -> [AvailInfo] -> ExportAvails +mkExportAvails mod_name unqual_imp name_env avails + = (mod_avail_env, entity_avail_env) 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 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] + -- 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} - -********************************************************* -* * -\subsection{Creating a new imported name} -* * -********************************************************* + returnRn export_avails -\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) - 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 + | not (maybeToBool maybe_in_scope) + = failWithRn acc (unknownNameErr (ieName ie)) + + | not (null dup_names) + = addNameClashErrRn rdr_name ((name,prov):dup_names) `thenRn_` + returnRn acc + +#ifdef DEBUG + -- I can't see why this should ever happen; if the thing is in scope + -- at all it ought to have some availability + | not (maybeToBool maybe_avail) + = pprTrace "exportsFromAvail: curious Nothing:" (ppr name) + returnRn acc +#endif + + | not enough_avail + = failWithRn acc (exportItemErr ie) + + | otherwise -- 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) + + where + rdr_name = ieName ie + maybe_in_scope = lookupFM global_name_env rdr_name + Just ((name,prov):dup_names) = maybe_in_scope + maybe_avail = lookupUFM entity_avail_env name + Just avail = maybe_avail + maybe_export_avail = filterAvail ie avail + enough_avail = maybeToBool maybe_export_avail + Just export_avail = maybe_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 + +mk_export_fn :: NameSet -> (Name -> Bool) -- True => exported +mk_export_fn exported_names = \name -> name `elemNameSet` exported_names \end{code} +%************************************************************************ +%* * +\subsection{Errors} +%* * +%************************************************************************ + \begin{code} -globalDupNamesErr rdr rns sty - = ppAboves (message : map pp_dup rns) - 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) +badImportItemErr mod ie + = sep [ptext SLIT("Module"), quotes (ppr mod), + ptext SLIT("does not export"), quotes (ppr ie)] + +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}