X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnNames.lhs;h=571ee3a5e1b50b260f914d4a43801dd5b8c44984;hb=d00cf5b8622c0715a038129c6887bb677baa5996;hp=d98dc2aca9d1b3a6477c4ae4e1b5674d74db472a;hpb=39262efa1c066d97547ac72d8bd16a145ac3f359;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnNames.lhs b/ghc/compiler/rename/RnNames.lhs index d98dc2a..571ee3a 100644 --- a/ghc/compiler/rename/RnNames.lhs +++ b/ghc/compiler/rename/RnNames.lhs @@ -5,49 +5,43 @@ \begin{code} module RnNames ( - getGlobalNames + getGlobalNames, exportsFromAvail ) where #include "HsVersions.h" -import CmdLineOpts ( opt_NoImplicitPrelude, opt_WarnDuplicateExports, - opt_SourceUnchanged, opt_WarnUnusedBinds - ) - -import HsSyn ( HsModule(..), HsDecl(..), TyClDecl(..), - IE(..), ieName, - ForeignDecl(..), ForKind(..), isDynamic, - FixitySig(..), Sig(..), ImportDecl(..), - collectTopBinders - ) -import RdrHsSyn ( RdrNameIE, RdrNameImportDecl, - RdrNameHsModule, RdrNameHsDecl - ) -import RnIfaces ( getInterfaceExports, getDeclBinders, getDeclSysBinders, - recordSlurp, checkUpToDate - ) +import CmdLineOpts ( DynFlag(..) ) + +import HsSyn ( HsModule(..), HsDecl(..), IE(..), ieName, ImportDecl(..), + ForeignDecl(..), ForKind(..), isDynamicExtName, + collectTopBinders + ) +import RdrHsSyn ( RdrNameIE, RdrNameImportDecl, + RdrNameHsModule, RdrNameHsDecl + ) +import RnIfaces ( getInterfaceExports, recordLocalSlurps ) +import RnHiFiles ( getTyClDeclBinders ) import RnEnv import RnMonad import FiniteMap -import PrelMods -import PrelInfo ( main_RDR ) -import UniqFM ( lookupUFM ) -import Bag ( bagToList ) -import Maybes ( maybeToBool ) -import Module ( ModuleName, mkThisModule, pprModuleName, WhereFrom(..) ) +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, ExportFlag(..), ImportReason(..), Provenance(..), - isLocallyDefined, setNameProvenance, - nameOccName, getSrcLoc, pprProvenance, getNameProvenance - ) -import RdrName ( RdrName, rdrNameOcc, mkRdrQual, mkRdrUnqual, isQual ) -import SrcLoc ( SrcLoc ) -import NameSet ( elemNameSet, emptyNameSet ) +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 Unique ( getUnique ) -import Util ( removeDups, equivClassesByUniq, sortLt ) -import List ( partition ) +import Maybes ( maybeToBool, catMaybes, mapMaybe ) +import UniqFM ( emptyUFM, listToUFM ) +import ListSetOps ( removeDups ) +import Util ( sortLt ) +import List ( partition ) \end{code} @@ -59,47 +53,31 @@ import List ( partition ) %************************************************************************ \begin{code} -getGlobalNames :: RdrNameHsModule - -> RnMG (Maybe (ExportEnv, - GlobalRdrEnv, - FixityEnv, -- Fixities for local decls only - NameEnv AvailInfo -- Maps a name to its parent AvailInfo - -- Just for in-scope things only - )) - -- 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 (\ ~(rec_gbl_env, rec_exported_avails, _) -> +getGlobalNames :: Module -> RdrNameHsModule + -> RnMG (GlobalRdrEnv, -- Maps all in-scope things + GlobalRdrEnv, -- Maps just *local* things + ExportAvails) -- The exported stuff - let - rec_unqual_fn :: Name -> Bool -- Is this chap in scope unqualified? - rec_unqual_fn = unQualInScope rec_gbl_env - - rec_exp_fn :: Name -> ExportFlag - rec_exp_fn = mk_export_fn (availsToNameSet rec_exported_avails) - in - setModuleRn this_mod $ - - -- PROCESS LOCAL DECLS +getGlobalNames this_mod (HsModule _ _ _ imports decls _ mod_loc) + = -- 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) -> + 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 + + get_imports = importsFromImportDecl this_mod_name 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) -> + mapAndUnzipRn get_imports ordinary `thenRn` \ (imp_gbl_envs1, imp_avails_s1) -> + mapAndUnzipRn get_imports source `thenRn` \ (imp_gbl_envs2, imp_avails_s2) -> -- COMBINE RESULTS -- We put the local env second, so that a local provenance @@ -113,160 +91,87 @@ getGlobalNames (HsModule this_mod _ exports imports decls mod_loc) all_avails = foldr plusExportAvails local_mod_avails (imp_avails_s2 ++ imp_avails_s1) in - -- 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. - checkEarlyExit this_mod `thenRn` \ up_to_date -> - if up_to_date then - returnRn (gbl_env, junk_exp_fn, Nothing) - else - - -- RECORD BETTER PROVENANCES IN THE CACHE - -- The names in the envirnoment have better provenances (e.g. imported on line x) - -- than the names in the name cache. We update the latter now, so that we - -- we start renaming declarations we'll get the good names - -- The isQual is because the qualified name is always in scope - updateProvenances (concat [names | (rdr_name, names) <- rdrEnvToList imp_gbl_env, - isQual rdr_name]) `thenRn_` - - -- PROCESS EXPORT LISTS - exportsFromAvail this_mod exports all_avails gbl_env `thenRn` \ exported_avails -> - - -- DONE - returnRn (gbl_env, exported_avails, Just all_avails) - ) `thenRn` \ (gbl_env, exported_avails, maybe_stuff) -> - - case maybe_stuff of { - Nothing -> returnRn Nothing ; - Just all_avails -> - - -- DEAL WITH FIXITIES - fixitiesFromLocalDecls gbl_env decls `thenRn` \ local_fixity_env -> - let - -- Export only those fixities that are for names that are - -- (a) defined in this module - -- (b) exported - exported_fixities :: [(Name,Fixity)] - exported_fixities = [(name,fixity) - | FixitySig name fixity _ <- nameEnvElts local_fixity_env, - isLocallyDefined name - ] - - -- CONSTRUCT RESULTS - export_mods = case exports of - Nothing -> [] - Just es -> [mod | IEModuleContents mod <- es, mod /= this_mod] - - export_env = ExportEnv exported_avails exported_fixities export_mods - (_, global_avail_env) = all_avails - in - traceRn (text "fixity env" <+> vcat (map ppr (nameEnvElts local_fixity_env))) `thenRn_` - - returnRn (Just (export_env, gbl_env, local_fixity_env, global_avail_env)) - } + -- ALL DONE + returnRn (gbl_env, local_gbl_env, all_avails) where - junk_exp_fn = error "RnNames:export_fn" - - all_imports = prel_imports ++ imports + 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. - 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] + 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} -checkEarlyExit mod - = checkErrsRn `thenRn` \ no_errs_so_far -> - if not no_errs_so_far then - -- Found errors already, so exit now - returnRn True - else - - traceRn (text "Considering whether compilation is required...") `thenRn_` - if not opt_SourceUnchanged then - -- Source code changed and no errors yet... carry on - traceRn (nest 4 (text "source file changed or recompilation check turned off")) `thenRn_` - returnRn False - else - - -- Unchanged source, and no errors yet; see if usage info - -- up to date, and exit if so - checkUpToDate mod `thenRn` \ up_to_date -> - (if up_to_date - then putDocRn (text "Compilation IS NOT required") - else returnRn ()) `thenRn_` - returnRn up_to_date -\end{code} - -\begin{code} -importsFromImportDecl :: (Name -> Bool) -- OK to omit qualifier +importsFromImportDecl :: ModuleName -> RdrNameImportDecl -> RnMG (GlobalRdrEnv, ExportAvails) -importsFromImportDecl is_unqual (ImportDecl imp_mod_name from qual_only as_mod import_spec iloc) +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) -> + getInterfaceExports imp_mod_name from `thenRn` \ (imp_mod, avails_by_module) -> - if null avails then + 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 - filterImports imp_mod_name import_spec avails - `thenRn` \ (filtered_avails, hides, explicits) -> + let + 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 + filterImports imp_mod_name from import_spec avails `thenRn` \ (filtered_avails, hides, explicits) -> - -- We 'improve' the provenance by setting - -- (a) the import-reason field, so that the Name says how it came into scope - -- including whether it's explicitly imported - -- (b) the print-unqualified field - -- But don't fiddle with wired-in things or we get in a twist let - improve_prov name = - setNameProvenance name (NonLocalDef (UserImport imp_mod iloc (is_explicit name)) - (is_unqual name)) - is_explicit name = name `elemNameSet` explicits + mk_provenance name = NonLocalDef (UserImport imp_mod iloc (name `elemNameSet` explicits)) in + qualifyImports imp_mod_name (not qual_only) -- Maybe want unqualified names as_mod hides - filtered_avails improve_prov - `thenRn` \ (rdr_name_env, mod_avails) -> - - returnRn (rdr_name_env, mod_avails) + mk_provenance + filtered_avails \end{code} \begin{code} -importsFromLocalDecls mod_name rec_exp_fn decls - = mapRn (getLocalDeclBinders newLocalName) decls `thenRn` \ avails_s -> +importsFromLocalDecls this_mod decls + = mapRn (getLocalDeclBinders this_mod) decls `thenRn` \ avails_s -> let avails = concat avails_s @@ -278,86 +183,56 @@ importsFromLocalDecls mod_name rec_exp_fn decls (_, dups) = removeDups compare all_names in -- Check for duplicate definitions - mapRn_ (addErrRn . dupDeclErr) dups `thenRn_` + mapRn_ (addErrRn . dupDeclErr) dups `thenRn_` -- Record that locally-defined things are available - mapRn_ (recordSlurp Nothing) avails `thenRn_` + recordLocalSlurps (availsToNameSet avails) `thenRn_` -- Build the environment - qualifyImports mod_name - True -- Want unqualified names - Nothing -- no 'as M' - [] -- Hide nothing + qualifyImports (moduleName this_mod) + True -- Want unqualified names + Nothing -- no 'as M' + [] -- Hide nothing + (\n -> LocalDef) -- Provenance is local avails - (\n -> n) +--------------------------- +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 - mod = mkThisModule mod_name + new (rdr_name, loc) = newTopBinder mod rdr_name loc `thenRn` \ name -> + returnRn (Avail name) - newLocalName rdr_name loc - = (if isQual rdr_name then - qualNameErr (text "the binding for" <+> quotes (ppr rdr_name)) (rdr_name,loc) - -- 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 - else - returnRn ()) `thenRn_` +getLocalDeclBinders mod (ForD (ForeignDecl nm kind _ ext_nm _ loc)) + | binds_haskell_name kind + = newTopBinder mod nm loc `thenRn` \ name -> + returnRn [Avail name] - newLocalTopBinder mod (rdrNameOcc rdr_name) rec_exp_fn loc - - -getLocalDeclBinders :: (RdrName -> SrcLoc -> RnMG Name) -- New-name function - -> RdrNameHsDecl - -> RnMG Avails -getLocalDeclBinders new_name (ValD binds) - = mapRn do_one (bagToList (collectTopBinders binds)) + | otherwise -- a foreign export + = returnRn [] where - do_one (rdr_name, loc) = new_name rdr_name loc `thenRn` \ name -> - returnRn (Avail name) - -getLocalDeclBinders new_name decl - = getDeclBinders new_name decl `thenRn` \ maybe_avail -> - case maybe_avail of - Nothing -> returnRn [] -- Instance decls and suchlike - Just avail -> getDeclSysBinders new_sys_name decl `thenRn_` - returnRn [avail] - where - -- The getDeclSysBinders is just to get the names of superclass selectors - -- etc, into the cache - new_sys_name rdr_name loc = newImplicitBinder (rdrNameOcc rdr_name) loc - -fixitiesFromLocalDecls :: GlobalRdrEnv -> [RdrNameHsDecl] -> RnMG FixityEnv -fixitiesFromLocalDecls gbl_env decls - = foldlRn getFixities emptyNameEnv decls - where - getFixities :: FixityEnv -> RdrNameHsDecl -> RnMG FixityEnv - getFixities acc (FixD fix) - = fix_decl acc fix - - getFixities acc (TyClD (ClassDecl _ _ _ _ sigs _ _ _ _ _ _)) - = foldlRn fix_decl acc [sig | FixSig sig <- sigs] - -- Get fixities from class decl sigs too. - getFixities acc other_decl - = returnRn acc - - fix_decl acc sig@(FixitySig rdr_name fixity loc) - = -- Check for fixity decl for something not declared - case lookupRdrEnv gbl_env rdr_name of { - Nothing | opt_WarnUnusedBinds - -> pushSrcLocRn loc (addWarnRn (unusedFixityDecl rdr_name fixity)) - `thenRn_` returnRn acc - | otherwise -> returnRn acc ; - - Just (name:_) -> - - -- Check for duplicate fixity decl - case lookupNameEnv acc name of { - Just (FixitySig _ _ loc') -> addErrRn (dupFixityDecl rdr_name loc loc') - `thenRn_` returnRn acc ; - - Nothing -> returnRn (addToNameEnv acc name (FixitySig name fixity loc)) - }} + 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{Filtering imports} @@ -369,20 +244,24 @@ available, and filters it through the import spec (if any). \begin{code} 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 Nothing imports +filterImports mod from Nothing imports = returnRn (imports, [], emptyNameSet) -filterImports mod (Just (want_hiding, import_items)) avails - = mapMaybeRn check_item import_items `thenRn` \ avails_w_explicits -> +filterImports mod from (Just (want_hiding, import_items)) total_avails + = flatMapRn get_item import_items `thenRn` \ avails_w_explicits -> let (item_avails, explicits_s) = unzip avails_w_explicits explicits = foldl addListToNameSet emptyNameSet explicits_s @@ -390,33 +269,56 @@ filterImports mod (Just (want_hiding, import_items)) avails if want_hiding then -- All imported; item_avails to be hidden - returnRn (avails, item_avails, emptyNameSet) + returnRn (total_avails, item_avails, emptyNameSet) else -- Just item_avails imported; nothing to be hidden returnRn (item_avails, [], explicits) where import_fm :: FiniteMap OccName AvailInfo import_fm = listToFM [ (nameOccName name, avail) - | avail <- avails, + | 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. - check_item item@(IEModuleContents _) - = addErrRn (badImportItemErr mod item) `thenRn_` - returnRn Nothing + 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) + + get_item item + = case check_item item of + Nothing -> bale_out item + Just avail -> returnRn [(avail, availNames avail)] check_item item | not (maybeToBool maybe_in_import_avails) || not (maybeToBool maybe_filtered_avail) - = addErrRn (badImportItemErr mod item) `thenRn_` - returnRn Nothing - - | dodgy_import = addWarnRn (dodgyImportWarn mod item) `thenRn_` - returnRn (Just (filtered_avail, explicits)) + = Nothing - | otherwise = returnRn (Just (filtered_avail, explicits)) + | otherwise + = Just filtered_avail where wanted_occ = rdrNameOcc (ieName item) @@ -425,20 +327,6 @@ filterImports mod (Just (want_hiding, import_items)) avails Just avail = maybe_in_import_avails maybe_filtered_avail = filterAvail item avail Just filtered_avail = maybe_filtered_avail - explicits | dot_dot = [availName filtered_avail] - | otherwise = availNames filtered_avail - - dot_dot = case item of - IEThingAll _ -> True - other -> False - - dodgy_import = case (item, avail) of - (IEThingAll _, AvailTC _ [n]) -> True - -- This occurs when you import T(..), but - -- only export T abstractly. The single [n] - -- in the AvailTC is the type or class itself - - other -> False \end{code} @@ -459,15 +347,11 @@ 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 - -> (Name -> Name) -- Improves the provenance on imported things -> RnMG (GlobalRdrEnv, ExportAvails) - -- NB: the Names in ExportAvails don't have the improve-provenance - -- function applied to them - -- We could fix that, but I don't think it matters -qualifyImports this_mod unqual_imp as_mod hides - avails improve_prov +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. @@ -497,14 +381,50 @@ qualifyImports this_mod unqual_imp as_mod hides | unqual_imp = env2 | otherwise = env1 where - env1 = addOneToGlobalRdrEnv env (mkRdrQual qual_mod occ) better_name - env2 = addOneToGlobalRdrEnv env1 (mkRdrUnqual occ) better_name - occ = nameOccName name - better_name = improve_prov name + 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) + + +mkEmptyExportAvails :: ModuleName -> ExportAvails +mkEmptyExportAvails mod_name = (unitFM mod_name [], emptyUFM) + +mkExportAvails :: ModuleName -> Bool -> GlobalRdrEnv -> [AvailInfo] -> ExportAvails +mkExportAvails mod_name unqual_imp name_env avails + = (mod_avail_env, entity_avail_env) + where + mod_avail_env = unitFM mod_name unqual_avails + + -- 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 + + 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 + + unqual_in_scope n = unQualInScope name_env n + + entity_avail_env = listToUFM [ (name,avail) | avail <- avails, + name <- availNames avail] + +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} @@ -531,7 +451,7 @@ 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 - NameEnv AvailInfo) -- The accumulated exported stuff, kept in an env + AvailEnv) -- The accumulated exported stuff, kept in an env -- so we can common-up related AvailInfos type ExportOccMap = FiniteMap OccName (Name, RdrNameIE) @@ -553,7 +473,7 @@ 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] + then [IEVar main_RDR_Unqual] -- export Main.main *only* unless otherwise specified, else [IEModuleContents this_mod] -- but for all other modules export everything. @@ -561,8 +481,10 @@ exportsFromAvail this_mod Nothing export_avails global_name_env exportsFromAvail this_mod (Just export_items) (mod_avail_env, entity_avail_env) global_name_env - = foldlRn exports_from_item - ([], emptyFM, emptyNameEnv) export_items `thenRn` \ (_, _, export_avail_map) -> + = doptRn Opt_WarnDuplicateExports `thenRn` \ warn_dup_exports -> + foldlRn (exports_from_item warn_dup_exports) + ([], emptyFM, emptyAvailEnv) export_items + `thenRn` \ (_, _, export_avail_map) -> let export_avails :: [AvailInfo] export_avails = nameEnvElts export_avail_map @@ -570,12 +492,11 @@ exportsFromAvail this_mod (Just export_items) returnRn export_avails where - exports_from_item :: ExportAccum -> RdrNameIE -> RnMG ExportAccum + exports_from_item :: Bool -> ExportAccum -> RdrNameIE -> RnMG ExportAccum - exports_from_item acc@(mods, occs, avails) ie@(IEModuleContents mod) + exports_from_item warn_dups acc@(mods, occs, avails) ie@(IEModuleContents mod) | mod `elem` mods -- Duplicate export of M - = warnCheckRn opt_WarnDuplicateExports - (dupModuleExport mod) `thenRn_` + = warnCheckRn warn_dups (dupModuleExport mod) `thenRn_` returnRn acc | otherwise @@ -584,55 +505,55 @@ exportsFromAvail this_mod (Just export_items) Just mod_avails -> foldlRn (check_occs ie) occs mod_avails `thenRn` \ occs' -> let - avails' = foldl add_avail avails mod_avails + avails' = foldl addAvail avails mod_avails in returnRn (mod:mods, occs', avails') - exports_from_item acc@(mods, occs, avails) ie - | not (maybeToBool maybe_in_scope) - = failWithRn acc (unknownNameErr (ieName ie)) + exports_from_item warn_dups acc@(mods, occs, avails) ie + = lookupSrcName global_name_env (ieName ie) `thenRn` \ name -> - | not (null dup_names) - = addNameClashErrRn rdr_name (name:dup_names) `thenRn_` - returnRn acc + -- 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 ; -#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 + Just avail -> + + -- Filter out the bits we want + case filterAvail ie avail of { + Nothing -> -- Not enough availability + failWithRn acc (exportItemErr ie) ; - | not enough_avail - = 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) + }} - | otherwise -- Phew! It's OK! Now to check the occurrence stuff! - = check_occs ie occs export_avail `thenRn` \ occs' -> - returnRn (mods, occs', add_avail avails export_avail) - where - rdr_name = ieName ie - maybe_in_scope = lookupFM global_name_env rdr_name - Just (name: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 -add_avail avails avail = addToNameEnv_C plusAvail avails (availName avail) 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 - = foldlRn check occs (availNames avail) + = doptRn Opt_WarnDuplicateExports `thenRn` \ warn_dup_exports -> + foldlRn (check warn_dup_exports) occs (availNames avail) where - check occs name + 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 opt_WarnDuplicateExports + warnCheckRn warn_dup (dupExportWarn name_occ ie ie') `thenRn_` returnRn occs @@ -640,12 +561,6 @@ check_occs ie occs avail failWithRn occs (exportClashErr name_occ ie ie') where name_occ = nameOccName name - -mk_export_fn :: NameSet -> (Name -> ExportFlag) -mk_export_fn exported_names - = \name -> if name `elemNameSet` exported_names - then Exported - else NotExported \end{code} %************************************************************************ @@ -655,21 +570,28 @@ mk_export_fn exported_names %************************************************************************ \begin{code} -badImportItemErr mod ie - = sep [ptext SLIT("Module"), quotes (pprModuleName mod), +badImportItemErr mod from ie + = sep [ptext SLIT("Module"), quotes (ppr mod), source_import, ptext SLIT("does not export"), quotes (ppr ie)] - -dodgyImportWarn mod (IEThingAll tc) - = sep [ptext SLIT("Module") <+> quotes (pprModuleName mod) - <+> ptext SLIT("exports") <+> quotes (ppr tc), - ptext SLIT("with no constructors/class operations;"), - ptext SLIT("yet it is imported with a (..)")] - + where + 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 (pprModuleName mod)] + = hsep [ ptext SLIT("Unknown module in export list: module"), quotes (ppr mod)] exportItemErr export_item - = sep [ ptext SLIT("Bad export item"), quotes (ppr 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) @@ -678,13 +600,10 @@ exportClashErr occ_name ie1 ie2 dupDeclErr (n:ns) = vcat [ptext SLIT("Multiple declarations of") <+> quotes (ppr n), - nest 4 (vcat (map pp sorted_ns))] + nest 4 (vcat (map ppr sorted_locs))] where - sorted_ns = sortLt occ'ed_before (n:ns) - - occ'ed_before a b = LT == compare (getSrcLoc a) (getSrcLoc b) - - pp n = pprProvenance (getNameProvenance n) + 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), @@ -693,15 +612,6 @@ dupExportWarn occ_name ie1 ie2 dupModuleExport mod = hsep [ptext SLIT("Duplicate"), - quotes (ptext SLIT("Module") <+> pprModuleName mod), + quotes (ptext SLIT("Module") <+> ppr mod), ptext SLIT("in export list")] - -unusedFixityDecl rdr_name fixity - = hsep [ptext SLIT("Unused fixity declaration for"), quotes (ppr rdr_name)] - -dupFixityDecl rdr_name loc1 loc2 - = vcat [ptext SLIT("Multiple fixity declarations for") <+> quotes (ppr rdr_name), - ptext SLIT("at ") <+> ppr loc1, - ptext SLIT("and") <+> ppr loc2] - \end{code}