X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnNames.lhs;h=4df3ffbf3e03e05c122e4c17af11a8e45617c470;hb=cfcebde74cf826af12143a92bcffa8c995eee135;hp=633735bd1c071ada19d30bf2084064cb5792faf6;hpb=7dd11ebc4d4d091edc0f5e3c13f041b99961c136;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnNames.lhs b/ghc/compiler/rename/RnNames.lhs index 633735b..4df3ffb 100644 --- a/ghc/compiler/rename/RnNames.lhs +++ b/ghc/compiler/rename/RnNames.lhs @@ -1,694 +1,699 @@ -% -% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998 -% -\section[RnNames]{Extracting imported and top-level names in scope} - -\begin{code} -module RnNames ( - getGlobalNames - ) 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, - recordSlurp, checkUpToDate - ) -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 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 Outputable -import Unique ( getUnique ) -import Util ( removeDups, equivClassesByUniq, sortLt ) -import List ( partition ) -\end{code} - - - -%************************************************************************ -%* * -\subsection{Get global names} -%* * -%************************************************************************ - -\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, _) -> - - 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 - -- 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) -> - - -- 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 - - all_avails :: ExportAvails - 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 -> - - traceRn (text "updateProv" <+> fsep (map ppr (rdrEnvElts gbl_env))) `thenRn_` - - -- 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 - ] - in - traceRn (text "fixity env" <+> vcat (map ppr (nameEnvElts local_fixity_env))) `thenRn_` - - --- TIDY UP - let - export_env = ExportEnv exported_avails exported_fixities - (_, global_avail_env) = all_avails - in - returnRn (Just (export_env, gbl_env, local_fixity_env, global_avail_env)) - } - where - junk_exp_fn = error "RnNames:export_fn" - - 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 - = 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 -> - putDocRn (text "Compilation" <+> - text (if up_to_date then "IS NOT" else "IS") <+> - text "required") `thenRn_` - returnRn up_to_date -\end{code} - -\begin{code} -importsFromImportDecl :: (Name -> Bool) -- OK to omit qualifier - -> RdrNameImportDecl - -> RnMG (GlobalRdrEnv, - ExportAvails) - -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) -> - - 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 - - filterImports imp_mod_name 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 - 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) -\end{code} - - -\begin{code} -importsFromLocalDecls mod_name rec_exp_fn decls - = mapRn (getLocalDeclBinders newLocalName) decls `thenRn` \ avails_s -> - - let - avails = concat avails_s - - all_names :: [Name] -- All the defns; no dups eliminated - all_names = [name | avail <- avails, name <- availNames avail] - - dups :: [[Name]] - dups = filter non_singleton (equivClassesByUniq getUnique all_names) - where - non_singleton (x1:x2:xs) = True - non_singleton other = False - in - -- Check for duplicate definitions - mapRn_ (addErrRn . dupDeclErr) dups `thenRn_` - - -- Record that locally-defined things are available - mapRn_ (recordSlurp Nothing) avails `thenRn_` - - -- Build the environment - qualifyImports mod_name - True -- Want unqualified names - Nothing -- no 'as M' - [] -- Hide nothing - avails - (\n -> n) - - where - newLocalName rdr_name loc = newLocalTopBinder mod (rdrNameOcc rdr_name) - rec_exp_fn loc - mod = mkThisModule mod_name - -getLocalDeclBinders :: (RdrName -> SrcLoc -> RnMG Name) -- New-name function - -> RdrNameHsDecl - -> RnMG Avails -getLocalDeclBinders new_name (ValD binds) - = mapRn do_one (bagToList (collectTopBinders binds)) - where - do_one (rdr_name, loc) = new_name rdr_name loc `thenRn` \ name -> - returnRn (Avail name) - - -- foreign declarations -getLocalDeclBinders new_name (ForD (ForeignDecl nm kind _ dyn _ loc)) - | binds_haskell_name kind dyn - = new_name nm loc `thenRn` \ name -> - returnRn [Avail name] - - | otherwise - = returnRn [] - -getLocalDeclBinders new_name decl - = getDeclBinders new_name decl `thenRn` \ maybe_avail -> - case maybe_avail of - Nothing -> returnRn [] -- Instance decls and suchlike - Just avail -> returnRn [avail] - -binds_haskell_name (FoImport _) _ = True -binds_haskell_name FoLabel _ = True -binds_haskell_name FoExport ext_nm = isDynamic ext_nm - -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)) - }} -\end{code} - -%************************************************************************ -%* * -\subsection{Filtering imports} -%* * -%************************************************************************ - -@filterImports@ takes the @ExportEnv@ telling what the imported module makes -available, and filters it through the import spec (if any). - -\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) - 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 - = mapMaybeRn check_item import_items `thenRn` \ avails_w_explicits -> - let - (item_avails, explicits_s) = unzip avails_w_explicits - explicits = foldl addListToNameSet emptyNameSet explicits_s - in - 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 - 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. - - check_item item@(IEModuleContents _) - = addErrRn (badImportItemErr mod item) `thenRn_` - returnRn Nothing - - 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)) - - | otherwise = returnRn (Just (filtered_avail, explicits)) - - 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 - 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} - - - -%************************************************************************ -%* * -\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@. - -\begin{code} -qualifyImports :: ModuleName -- Imported module - -> Bool -- True <=> want unqualified import - -> Maybe ModuleName -- Optional "as M" part - -> [AvailInfo] -- What's to be hidden - -> 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 - = - -- 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 - - -- Delete things that are hidden - name_env2 = foldl del_avail name_env1 hides - - -- Create the export-availability info - export_avails = mkExportAvails qual_mod unqual_imp name_env2 avails - in - returnRn (name_env2, export_avails) - - where - qual_mod = case as_mod of - Nothing -> this_mod - Just another_name -> another_name - - add_avail :: GlobalRdrEnv -> AvailInfo -> GlobalRdrEnv - add_avail env avail = foldl add_name env (availNames avail) - - add_name env name - | 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 - - del_avail env avail = foldl delOneFromGlobalRdrEnv env rdr_names - where - rdr_names = map (mkRdrUnqual . nameOccName) (availNames avail) -\end{code} - - -%************************************************************************ -%* * -\subsection{Export list processing -%* * -%************************************************************************ - -Processing the export list. - -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). 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} -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 - -- 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 - = foldlRn exports_from_item - ([], emptyFM, emptyNameEnv) export_items `thenRn` \ (_, _, export_avail_map) -> - let - export_avails :: [AvailInfo] - export_avails = nameEnvElts export_avail_map - in - returnRn export_avails - - where - exports_from_item :: ExportAccum -> RdrNameIE -> RnMG ExportAccum - - exports_from_item acc@(mods, occs, avails) ie@(IEModuleContents mod) - | mod `elem` mods -- Duplicate export of M - = warnCheckRn opt_WarnDuplicateExports - (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 add_avail 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)) - - | not (null dup_names) - = addNameClashErrRn rdr_name (name: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! - = 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 - -check_occs :: RdrNameIE -> ExportOccMap -> AvailInfo -> RnMG ExportOccMap -check_occs ie occs avail - = foldlRn check occs (availNames avail) - where - check 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 - (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 -> ExportFlag) -mk_export_fn exported_names - = \name -> if name `elemNameSet` exported_names - then Exported - else NotExported -\end{code} - -%************************************************************************ -%* * -\subsection{Errors} -%* * -%************************************************************************ - -\begin{code} -badImportItemErr mod ie - = sep [ptext SLIT("Module"), quotes (pprModuleName mod), - 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 (..)")] - -modExportErr mod - = hsep [ ptext SLIT("Unknown module in export list: module"), quotes (pprModuleName mod)] - -exportItemErr export_item - = sep [ ptext SLIT("Bad export item"), quotes (ppr export_item)] - -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 pp sorted_ns))] - 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) - -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") <+> pprModuleName 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} +% +% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998 +% +\section[RnNames]{Extracting imported and top-level names in scope} + +\begin{code} +module RnNames ( + getGlobalNames + ) 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 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 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 Outputable +import Unique ( getUnique ) +import Util ( removeDups, equivClassesByUniq, sortLt ) +import List ( partition ) +\end{code} + + + +%************************************************************************ +%* * +\subsection{Get global names} +%* * +%************************************************************************ + +\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, _) -> + + 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 + -- 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) -> + + -- 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 + + all_avails :: ExportAvails + 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 -> + + traceRn (text "updateProv" <+> fsep (map ppr (rdrEnvElts gbl_env))) `thenRn_` + + -- 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 + ] + in + traceRn (text "fixity env" <+> vcat (map ppr (nameEnvElts local_fixity_env))) `thenRn_` + + --- TIDY UP + let + export_env = ExportEnv exported_avails exported_fixities + (_, global_avail_env) = all_avails + in + returnRn (Just (export_env, gbl_env, local_fixity_env, global_avail_env)) + } + where + junk_exp_fn = error "RnNames:export_fn" + + 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 + = 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 -> + putDocRn (text "Compilation" <+> + text (if up_to_date then "IS NOT" else "IS") <+> + text "required") `thenRn_` + returnRn up_to_date +\end{code} + +\begin{code} +importsFromImportDecl :: (Name -> Bool) -- OK to omit qualifier + -> RdrNameImportDecl + -> RnMG (GlobalRdrEnv, + ExportAvails) + +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) -> + + 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 + + filterImports imp_mod_name 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 + 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) +\end{code} + + +\begin{code} +importsFromLocalDecls mod_name rec_exp_fn decls + = mapRn (getLocalDeclBinders newLocalName) decls `thenRn` \ avails_s -> + + let + avails = concat avails_s + + all_names :: [Name] -- All the defns; no dups eliminated + all_names = [name | avail <- avails, name <- availNames avail] + + dups :: [[Name]] + dups = filter non_singleton (equivClassesByUniq getUnique all_names) + where + non_singleton (x1:x2:xs) = True + non_singleton other = False + in + -- Check for duplicate definitions + mapRn_ (addErrRn . dupDeclErr) dups `thenRn_` + + -- Record that locally-defined things are available + mapRn_ (recordSlurp Nothing) avails `thenRn_` + + -- Build the environment + qualifyImports mod_name + True -- Want unqualified names + Nothing -- no 'as M' + [] -- Hide nothing + avails + (\n -> n) + + where + newLocalName rdr_name loc = newLocalTopBinder mod (rdrNameOcc rdr_name) + rec_exp_fn loc + mod = mkThisModule mod_name + +getLocalDeclBinders :: (RdrName -> SrcLoc -> RnMG Name) -- New-name function + -> RdrNameHsDecl + -> RnMG Avails +getLocalDeclBinders new_name (ValD binds) + = mapRn do_one (bagToList (collectTopBinders binds)) + where + do_one (rdr_name, loc) = new_name rdr_name loc `thenRn` \ name -> + returnRn (Avail name) + + -- foreign declarations +getLocalDeclBinders new_name (ForD (ForeignDecl nm kind _ dyn _ loc)) + | binds_haskell_name kind dyn + = new_name nm loc `thenRn` \ name -> + returnRn [Avail name] + + | otherwise + = returnRn [] + +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 + +binds_haskell_name (FoImport _) _ = True +binds_haskell_name FoLabel _ = True +binds_haskell_name FoExport ext_nm = isDynamic ext_nm + +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)) + }} +\end{code} + +%************************************************************************ +%* * +\subsection{Filtering imports} +%* * +%************************************************************************ + +@filterImports@ takes the @ExportEnv@ telling what the imported module makes +available, and filters it through the import spec (if any). + +\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) + 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 + = mapMaybeRn check_item import_items `thenRn` \ avails_w_explicits -> + let + (item_avails, explicits_s) = unzip avails_w_explicits + explicits = foldl addListToNameSet emptyNameSet explicits_s + in + 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 + 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. + + check_item item@(IEModuleContents _) + = addErrRn (badImportItemErr mod item) `thenRn_` + returnRn Nothing + + 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)) + + | otherwise = returnRn (Just (filtered_avail, explicits)) + + 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 + 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} + + + +%************************************************************************ +%* * +\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@. + +\begin{code} +qualifyImports :: ModuleName -- Imported module + -> Bool -- True <=> want unqualified import + -> Maybe ModuleName -- Optional "as M" part + -> [AvailInfo] -- What's to be hidden + -> 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 + = + -- 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 + + -- Delete things that are hidden + name_env2 = foldl del_avail name_env1 hides + + -- Create the export-availability info + export_avails = mkExportAvails qual_mod unqual_imp name_env2 avails + in + returnRn (name_env2, export_avails) + + where + qual_mod = case as_mod of + Nothing -> this_mod + Just another_name -> another_name + + add_avail :: GlobalRdrEnv -> AvailInfo -> GlobalRdrEnv + add_avail env avail = foldl add_name env (availNames avail) + + add_name env name + | 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 + + del_avail env avail = foldl delOneFromGlobalRdrEnv env rdr_names + where + rdr_names = map (mkRdrUnqual . nameOccName) (availNames avail) +\end{code} + + +%************************************************************************ +%* * +\subsection{Export list processing +%* * +%************************************************************************ + +Processing the export list. + +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). 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} +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 + -- 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 + = foldlRn exports_from_item + ([], emptyFM, emptyNameEnv) export_items `thenRn` \ (_, _, export_avail_map) -> + let + export_avails :: [AvailInfo] + export_avails = nameEnvElts export_avail_map + in + returnRn export_avails + + where + exports_from_item :: ExportAccum -> RdrNameIE -> RnMG ExportAccum + + exports_from_item acc@(mods, occs, avails) ie@(IEModuleContents mod) + | mod `elem` mods -- Duplicate export of M + = warnCheckRn opt_WarnDuplicateExports + (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 add_avail 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)) + + | not (null dup_names) + = addNameClashErrRn rdr_name (name: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! + = 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 + +check_occs :: RdrNameIE -> ExportOccMap -> AvailInfo -> RnMG ExportOccMap +check_occs ie occs avail + = foldlRn check occs (availNames avail) + where + check 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 + (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 -> ExportFlag) +mk_export_fn exported_names + = \name -> if name `elemNameSet` exported_names + then Exported + else NotExported +\end{code} + +%************************************************************************ +%* * +\subsection{Errors} +%* * +%************************************************************************ + +\begin{code} +badImportItemErr mod ie + = sep [ptext SLIT("Module"), quotes (pprModuleName mod), + 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 (..)")] + +modExportErr mod + = hsep [ ptext SLIT("Unknown module in export list: module"), quotes (pprModuleName mod)] + +exportItemErr export_item + = sep [ ptext SLIT("Bad export item"), quotes (ppr export_item)] + +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 pp sorted_ns))] + 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) + +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") <+> pprModuleName 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}