X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnIfaces.lhs;h=62993fd30f2a22eeae8b3acfbb37efab4bd470dc;hb=d2cca44eae15bbbd3b86889448e796bc785dfa52;hp=97445c9c62e117e60759cc99d5e47514f5283a3c;hpb=68afb16743cafd5b7495771d359891c6dfc5a186;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnIfaces.lhs b/ghc/compiler/rename/RnIfaces.lhs index 97445c9..62993fd 100644 --- a/ghc/compiler/rename/RnIfaces.lhs +++ b/ghc/compiler/rename/RnIfaces.lhs @@ -1,862 +1,1121 @@ % -% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996 +% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998 % \section[RnIfaces]{Cacheing and Renaming of Interfaces} \begin{code} -#include "HsVersions.h" - -module RnIfaces ( - findHiFiles, - cachedIface, - cachedDecl, - readIface, - rnIfaces, - IfaceCache(..) - ) where +module RnIfaces + ( + findAndReadIface, -import Ubiq + getInterfaceExports, + getImportedInstDecls, getImportedRules, + lookupFixityRn, loadHomeInterface, + importDecl, ImportDeclResult(..), recordLocalSlurps, + mkImportInfo, getSlurped, -import LibDirectory -import PreludeGlaST ( thenPrimIO, seqPrimIO, readVar, writeVar, MutableVar(..) ) + getDeclBinders, getDeclSysBinders, + removeContext -- removeContext probably belongs somewhere else + ) +where -import HsSyn -import HsPragmas ( noGenPragmas ) -import RdrHsSyn -import RnHsSyn +#include "HsVersions.h" -import RnMonad -import RnSource ( rnTyDecl, rnClassDecl, rnInstDecl, rnPolyType ) -import RnUtils ( RnEnv(..), emptyRnEnv, lookupRnEnv, lookupTcRnEnv, extendGlobalRnEnv ) -import ParseIface ( parseIface ) -import ParseUtils ( ParsedIface(..), RdrIfaceDecl(..), RdrIfaceInst(..), - VersionsMap(..), UsagesMap(..) +import CmdLineOpts ( opt_NoPruneDecls, opt_NoPruneTyDecls, opt_IgnoreIfacePragmas ) +import HsSyn ( HsDecl(..), TyClDecl(..), InstDecl(..), IfaceSig(..), + HsType(..), ConDecl(..), IE(..), ConDetails(..), Sig(..), + ForeignDecl(..), ForKind(..), isDynamicExtName, + FixitySig(..), RuleDecl(..), + isClassOpSig, DeprecDecl(..) ) - -import Bag ( emptyBag, unitBag, consBag, snocBag, - unionBags, unionManyBags, isEmptyBag, bagToList ) -import CmdLineOpts ( opt_HiSuffix, opt_SysHiSuffix ) -import ErrUtils ( Error(..), Warning(..) ) -import FiniteMap ( emptyFM, lookupFM, addToFM, addToFM_C, plusFM, eltsFM, - fmToList, delListFromFM, sizeFM, foldFM, unitFM, - plusFM_C, keysFM{-ToDo:rm-} +import HsImpExp ( ImportDecl(..), ieNames ) +import CoreSyn ( CoreRule ) +import BasicTypes ( Version, defaultFixity ) +import RdrHsSyn ( RdrNameHsDecl, RdrNameInstDecl, RdrNameRuleDecl, + RdrNameDeprecation, RdrNameIE, + extractHsTyRdrNames ) -import Maybes ( maybeToBool ) -import Name ( moduleNamePair, origName, isRdrLexCon, RdrName(..) ) -import PprStyle -- ToDo:rm -import Outputable -- ToDo:rm -import PrelInfo ( builtinNameInfo ) -import Pretty -import Maybes ( MaybeErr(..) ) -import UniqFM ( emptyUFM ) -import UniqSupply ( splitUniqSupply ) -import Util ( sortLt, removeDups, cmpPString, startsWith, - panic, pprPanic, assertPanic, pprTrace{-ToDo:rm-} ) -\end{code} - -\begin{code} -type ModuleToIfaceContents = FiniteMap Module ParsedIface -type ModuleToIfaceFilePath = FiniteMap Module FilePath - -type IfaceCache - = MutableVar _RealWorld - (ModuleToIfaceContents, -- interfaces for individual interface files - ModuleToIfaceContents, -- merged interfaces based on module name - -- used for extracting info about original names - ModuleToIfaceFilePath) -\end{code} - -********************************************************* -* * -\subsection{Looking for interface files} -* * -********************************************************* - -Return a mapping from module-name to -absolute-filename-for-that-interface. -\begin{code} -findHiFiles :: [FilePath] -> [FilePath] -> IO (FiniteMap Module FilePath) - -findHiFiles dirs sysdirs - = --hPutStr stderr " findHiFiles " >> - do_dirs emptyFM (dirs ++ sysdirs) >>= \ result -> - --hPutStr stderr " done\n" >> - return result - where - do_dirs env [] = return env - do_dirs env (dir:dirs) - = do_dir env dir >>= \ new_env -> - do_dirs new_env dirs - ------- - do_dir env dir - = --hPutStr stderr "D" >> - getDirectoryContents dir >>= \ entries -> - do_entries env entries - where - do_entries env [] = return env - do_entries env (e:es) - = do_entry env e >>= \ new_env -> - do_entries new_env es - ------- - do_entry env e - = case (acceptable_hi (reverse e)) of - Nothing -> --trace ("Deemed uncool:"++e) $ - --hPutStr stderr "." >> - return env - Just mod -> - let - pmod = _PK_ mod - in - case (lookupFM env pmod) of - Nothing -> --trace ("Adding "++mod++" -> "++e) $ - --hPutStr stderr "!" >> - return (addToFM env pmod (dir ++ '/':e)) - -- ToDo: use DIR_SEP, not / - - Just xx -> ( if de_dot xx /= e then trace ("Already mapped!! "++mod++" -> "++xx++"; ignoring:"++e) else id) $ - --hPutStr stderr "." >> - return env - ------- - acceptable_hi rev_e -- looking at pathname *backwards* - = case (startsWith (reverse opt_HiSuffix) rev_e) of - Nothing -> Nothing - Just xs -> plausible_modname xs{-reversed-} - - ------- - de_dot ('.' : '/' : xs) = xs - de_dot xs = xs - - ------- - plausible_modname rev_e - = let - cand = reverse (takeWhile is_modname_char rev_e) - in - if null cand || not (isUpper (head cand)) - then Nothing - else Just cand - where - is_modname_char c = isAlphanum c || c == '_' +import RnEnv +import RnMonad +import ParseIface ( parseIface, IfaceStuff(..) ) + +import Name ( Name {-instance NamedThing-}, nameOccName, + nameModule, isLocallyDefined, + NamedThing(..), + mkNameEnv, elemNameEnv, extendNameEnv + ) +import Module ( Module, ModuleEnv, + moduleName, isModuleInThisPackage, + ModuleName, WhereFrom(..), + emptyModuleEnv, extendModuleEnv, lookupModuleEnv, lookupModuleEnvByName, + extendModuleEnv_C, lookupWithDefaultModuleEnv + ) +import RdrName ( RdrName, rdrNameOcc ) +import NameSet +import SrcLoc ( mkSrcLoc, SrcLoc ) +import PrelInfo ( cCallishTyKeys, wiredInThingEnv ) +import Maybes ( maybeToBool, orElse ) +import StringBuffer ( hGetStringBuffer ) +import FastString ( mkFastString ) +import ErrUtils ( Message ) +import Util ( sortLt ) +import Lex +import FiniteMap +import Outputable +import Bag +import HscTypes + +import List ( nub ) \end{code} -********************************************************* -* * -\subsection{Reading interface files} -* * -********************************************************* - -Return cached info about a Module's interface; otherwise, -read the interface (using our @ModuleToIfaceFilePath@ map -to decide where to look). - -Note: we have two notions of interface - * the interface for a particular file name - * the (combined) interface for a particular module name - -The idea is that two source files may declare a module -with the same name with the declarations being merged. - -This allows us to have file PreludeList.hs producing -PreludeList.hi but defining part of module Prelude. -When PreludeList is imported its contents will be -added to Prelude. In this way all the original names -for a particular module will be available the imported -decls are renamed. - -ToDo: Check duplicate definitons are the same. -ToDo: Check/Merge duplicate pragmas. +%********************************************************* +%* * +\subsection{Loading a new interface file} +%* * +%********************************************************* \begin{code} -cachedIface :: Bool -- True => want merged interface for original name - -> IfaceCache -- False => want file interface only - -> Module - -> IO (MaybeErr ParsedIface Error) - -cachedIface want_orig_iface iface_cache mod - = readVar iface_cache `thenPrimIO` \ (iface_fm, orig_fm, file_fm) -> - - case (lookupFM iface_fm mod) of - Just iface -> return (want_iface iface orig_fm) - Nothing -> - case (lookupFM file_fm mod) of - Nothing -> return (Failed (noIfaceErr mod)) - Just file -> - readIface file mod >>= \ read_iface -> - case read_iface of - Failed err -> -- pprTrace "module-file map:\n" (ppAboves [ppCat [ppPStr m, ppStr f] | (m,f) <- fmToList file_fm]) $ - return (Failed err) - Succeeded iface -> - let - iface_fm' = addToFM iface_fm mod iface - orig_fm' = addToFM_C mergeIfaces orig_fm (iface_mod iface) iface - in - writeVar iface_cache (iface_fm', orig_fm', file_fm) `seqPrimIO` - return (want_iface iface orig_fm') +loadHomeInterface :: SDoc -> Name -> RnM d Ifaces +loadHomeInterface doc_str name + = loadInterface doc_str (moduleName (nameModule name)) ImportBySystem + +loadOrphanModules :: [ModuleName] -> RnM d () +loadOrphanModules mods + | null mods = returnRn () + | otherwise = traceRn (text "Loading orphan modules:" <+> + fsep (map ppr mods)) `thenRn_` + mapRn_ load mods `thenRn_` + returnRn () where - want_iface iface orig_fm - | want_orig_iface - = case lookupFM orig_fm mod of - Nothing -> Failed (noOrigIfaceErr mod) - Just orig_iface -> Succeeded orig_iface - | otherwise - = Succeeded iface - - iface_mod (ParsedIface mod _ _ _ _ _ _ _ _ _ _ _ _) = mod - ----------- -mergeIfaces (ParsedIface mod1 (_, files1) _ _ _ _ _ _ fixes1 tdefs1 vdefs1 idefs1 prags1) - (ParsedIface mod2 (_, files2) _ _ _ _ _ _ fixes2 tdefs2 vdefs2 idefs2 prags2) - = pprTrace "mergeIfaces:" (ppCat [ppStr "import", ppCat (map ppPStr (bagToList files2)), - ppStr "merged with", ppPStr mod1]) $ - ASSERT(mod1 == mod2) - ParsedIface mod1 - (True, unionBags files1 files2) - (panic "mergeIface: module version numbers") - (panic "mergeIface: source version numbers") -- Version numbers etc must be extracted from - (panic "mergeIface: usage version numbers") -- the merged file interfaces named above - (panic "mergeIface: decl version numbers") - (panic "mergeIface: exports") - (panic "mergeIface: instance modules") - (plusFM_C (dup_merge "fixity" (ppr PprDebug . fixDeclName)) fixes1 fixes2) - (plusFM_C (dup_merge "tycon/class" (ppr PprDebug . idecl_nm)) tdefs1 tdefs2) - (plusFM_C (dup_merge "value" (ppr PprDebug . idecl_nm)) vdefs1 vdefs2) - (unionBags idefs1 idefs2) - (plusFM_C (dup_merge "pragma" ppStr) prags1 prags2) + load mod = loadInterface (mk_doc mod) mod ImportBySystem + mk_doc mod = ppr mod <+> ptext SLIT("is a orphan-instance module") + + +loadInterface :: SDoc -> ModuleName -> WhereFrom -> RnM d Ifaces +loadInterface doc mod from + = tryLoadInterface doc mod from `thenRn` \ (ifaces, maybe_err) -> + case maybe_err of + Nothing -> returnRn ifaces + Just err -> failWithRn ifaces err + +tryLoadInterface :: SDoc -> ModuleName -> WhereFrom -> RnM d (Ifaces, Maybe Message) + -- Returns (Just err) if an error happened + -- Guarantees to return with iImpModInfo m --> (... Just cts) + -- (If the load fails, we plug in a vanilla placeholder +tryLoadInterface doc_str mod_name from + = getIfacesRn `thenRn` \ ifaces -> + let + mod_map = iImpModInfo ifaces + mod_info = lookupFM mod_map mod_name + + hi_boot_file + = case (from, mod_info) of + (ImportByUser, _) -> False -- Not hi-boot + (ImportByUserSource, _) -> True -- hi-boot + (ImportBySystem, Just (_, is_boot, _)) -> is_boot -- + (ImportBySystem, Nothing) -> False + -- We're importing a module we know absolutely + -- nothing about, so we assume it's from + -- another package, where we aren't doing + -- dependency tracking. So it won't be a hi-boot file. + + redundant_source_import + = case (from, mod_info) of + (ImportByUserSource, Just (_,False,_)) -> True + other -> False + in + -- CHECK WHETHER WE HAVE IT ALREADY + case mod_info of { + Just (_, _, True) + -> -- We're read it already so don't re-read it + returnRn (ifaces, Nothing) ; + + _ -> + + -- Issue a warning for a redundant {- SOURCE -} import + -- NB that we arrange to read all the ordinary imports before + -- any of the {- SOURCE -} imports + warnCheckRn (not redundant_source_import) + (warnRedundantSourceImport mod_name) `thenRn_` + + -- READ THE MODULE IN + findAndReadIface doc_str mod_name hi_boot_file `thenRn` \ read_result -> + case read_result of { + Left err -> -- Not found, so add an empty export env to the Ifaces map + -- so that we don't look again + let + new_mod_map = addToFM mod_map mod_name (False, False, True) + new_ifaces = ifaces { iImpModInfo = new_mod_map } + in + setIfacesRn new_ifaces `thenRn_` + returnRn (new_ifaces, Just err) ; + + -- Found and parsed! + Right (mod, iface) -> + + -- LOAD IT INTO Ifaces + + -- NB: *first* we do loadDecl, so that the provenance of all the locally-defined + --- names is done correctly (notably, whether this is an .hi file or .hi-boot file). + -- If we do loadExport first the wrong info gets into the cache (unless we + -- explicitly tag each export which seems a bit of a bore) + + + -- Sanity check. If we're system-importing a module we know nothing at all + -- about, it should be from a different package to this one + WARN( not (maybeToBool mod_info) && + case from of { ImportBySystem -> True; other -> False } && + isModuleInThisPackage mod, + ppr mod ) + + loadDecls mod (iDecls ifaces) (pi_decls iface) `thenRn` \ (decls_vers, new_decls) -> + loadRules mod (iRules ifaces) (pi_rules iface) `thenRn` \ (rule_vers, new_rules) -> + loadFixDecls mod_name (pi_fixity iface) `thenRn` \ fix_env -> + loadDeprecs mod (pi_deprecs iface) `thenRn` \ deprec_env -> + foldlRn (loadInstDecl mod) (iInsts ifaces) (pi_insts iface) `thenRn` \ new_insts -> + loadExports (pi_exports iface) `thenRn` \ (export_vers, avails) -> + let + version = VersionInfo { vers_module = pi_vers iface, + vers_exports = export_vers, + vers_rules = rule_vers, + vers_decls = decls_vers } + + -- For an explicit user import, add to mod_map info about + -- the things the imported module depends on, extracted + -- from its usage info. + mod_map1 = case from of + ImportByUser -> addModDeps mod (pi_usages iface) mod_map + other -> mod_map + mod_map2 = addToFM mod_map1 mod_name (has_orphans, hi_boot_file, True) + + -- Now add info about this module to the PIT + has_orphans = pi_orphan iface + new_pit = extendModuleEnv (iPIT ifaces) mod mod_iface + mod_iface = ModIface { mi_module = mod, mi_version = version, + mi_exports = avails, mi_orphan = has_orphans, + mi_fixities = fix_env, mi_deprecs = deprec_env, + mi_usages = [], -- Will be filled in later + mi_decls = panic "No mi_decls in PIT", + mi_globals = panic "No mi_globals in PIT" + } + + new_ifaces = ifaces { iPIT = new_pit, + iDecls = new_decls, + iInsts = new_insts, + iRules = new_rules, + iImpModInfo = mod_map2 } + in + setIfacesRn new_ifaces `thenRn_` + returnRn (new_ifaces, Nothing) + }} + +----------------------------------------------------- +-- Adding module dependencies from the +-- import decls in the interface file +----------------------------------------------------- + +addModDeps :: Module -> [ImportVersion a] + -> ImportedModuleInfo -> ImportedModuleInfo +-- (addModDeps M ivs deps) +-- We are importing module M, and M.hi contains 'import' decls given by ivs +addModDeps mod new_deps mod_deps + = foldr add mod_deps filtered_new_deps where - dup_merge str ppr_dup dup1 dup2 - = pprTrace "mergeIfaces:" - (ppCat [ppPStr mod1, ppPStr mod2, ppStr ": dup", ppStr str, ppStr "decl", - ppr_dup dup1, ppr_dup dup2]) $ - dup2 - - idecl_nm (TypeSig n _ _) = n - idecl_nm (NewTypeSig n _ _ _) = n - idecl_nm (DataSig n _ _ _ _) = n - idecl_nm (ClassSig n _ _ _) = n - idecl_nm (ValSig n _ _) = n - ----------- -cachedDecl :: IfaceCache - -> Bool -- True <=> tycon or class name - -> RdrName - -> IO (MaybeErr RdrIfaceDecl Error) - -cachedDecl iface_cache class_or_tycon orig - = cachedIface True iface_cache mod >>= \ maybe_iface -> - case maybe_iface of - Failed err -> return (Failed err) - Succeeded (ParsedIface _ _ _ _ _ _ exps _ _ tdefs vdefs _ _) -> - case (lookupFM (if class_or_tycon then tdefs else vdefs) str) of - Just decl -> return (Succeeded decl) - Nothing -> return (Failed (noDeclInIfaceErr mod str)) + -- Don't record dependencies when importing a module from another package + -- Except for its descendents which contain orphans, + -- and in that case, forget about the boot indicator + filtered_new_deps :: [(ModuleName, (WhetherHasOrphans, IsBootInterface, IsLoaded))] + filtered_new_deps + | isModuleInThisPackage mod + = [ (imp_mod, (has_orphans, is_boot, False)) + | (imp_mod, has_orphans, is_boot, _) <- new_deps + ] + | otherwise = [ (imp_mod, (True, False, False)) + | (imp_mod, has_orphans, _, _) <- new_deps, + has_orphans + ] + add (imp_mod, dep) deps = addToFM_C combine deps imp_mod dep + + combine old@(_, old_is_boot, old_is_loaded) new + | old_is_loaded || not old_is_boot = old -- Keep the old info if it's already loaded + -- or if it's a non-boot pending load + | otherwise = new -- Otherwise pick new info + + +----------------------------------------------------- +-- Loading the export list +----------------------------------------------------- + +loadExports :: (Version, [ExportItem]) -> RnM d (Version, Avails) +loadExports (vers, items) + = getModuleRn `thenRn` \ this_mod -> + mapRn (loadExport this_mod) items `thenRn` \ avails_s -> + returnRn (vers, concat avails_s) + + +loadExport :: Module -> ExportItem -> RnM d [AvailInfo] +loadExport this_mod (mod, entities) + | mod == moduleName this_mod = returnRn [] + -- 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.) 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. A bit bogus + -- but it's a bogus thing to do! + + | otherwise + = mapRn (load_entity mod) entities where - (mod, str) = moduleNamePair orig - ----------- -cachedDeclByType :: IfaceCache - -> RnName{-NB: diff type than cachedDecl -} - -> IO (MaybeErr RdrIfaceDecl Error) - -cachedDeclByType iface_cache rn - -- the idea is: check that, e.g., if we're given an - -- RnClass, then we really get back a ClassDecl from - -- the cache (not an RnData, or something silly) - = cachedDecl iface_cache (isRnTyConOrClass rn) (origName rn) >>= \ maybe_decl -> + new_name mod occ = newGlobalName mod occ + + load_entity mod (Avail occ) + = new_name mod occ `thenRn` \ name -> + returnRn (Avail name) + load_entity mod (AvailTC occ occs) + = new_name mod occ `thenRn` \ name -> + mapRn (new_name mod) occs `thenRn` \ names -> + returnRn (AvailTC name names) + + +----------------------------------------------------- +-- Loading type/class/value decls +----------------------------------------------------- + +loadDecls :: Module + -> DeclsMap + -> [(Version, RdrNameHsDecl)] + -> RnM d (NameEnv Version, DeclsMap) +loadDecls mod decls_map decls + = foldlRn (loadDecl mod) (emptyNameEnv, decls_map) decls + +loadDecl :: Module + -> (NameEnv Version, DeclsMap) + -> (Version, RdrNameHsDecl) + -> RnM d (NameEnv Version, DeclsMap) +loadDecl mod (version_map, decls_map) (version, decl) + = getDeclBinders new_name decl `thenRn` \ maybe_avail -> + case maybe_avail of { + Nothing -> returnRn (version_map, decls_map); -- No bindings + Just avail -> + + getDeclSysBinders new_name decl `thenRn` \ sys_bndrs -> let - return_maybe_decl = return maybe_decl - return_failed msg = return (Failed msg) + full_avail = addSysAvails avail sys_bndrs + -- Add the sys-binders to avail. When we import the decl, + -- it's full_avail that will get added to the 'already-slurped' set (iSlurp) + -- If we miss out sys-binders, we'll read the decl multiple times! + + main_name = availName avail + new_decls_map = foldl add_decl decls_map + [ (name, (full_avail, name==main_name, (mod, decl'))) + | name <- availNames full_avail] + add_decl decls_map (name, stuff) + = WARN( name `elemNameEnv` decls_map, ppr name ) + extendNameEnv decls_map name stuff + + new_version_map = extendNameEnv version_map main_name version in - case maybe_decl of - Failed _ -> return_maybe_decl - Succeeded if_decl -> - case rn of - WiredInId _ -> return_failed (ifaceLookupWiredErr "value" rn) - WiredInTyCon _ -> return_failed (ifaceLookupWiredErr "type constructor" rn) - RnUnbound _ -> pprPanic "cachedDeclByType:" (ppr PprDebug rn) - - RnSyn _ -> return_maybe_decl - RnData _ _ _ -> return_maybe_decl - RnImplicitTyCon _ -> if is_tycon_decl if_decl - then return_maybe_decl - else return_failed (badIfaceLookupErr "type constructor" rn if_decl) - - RnClass _ _ -> return_maybe_decl - RnImplicitClass _ -> if is_class_decl if_decl - then return_maybe_decl - else return_failed (badIfaceLookupErr "class" rn if_decl) - - RnName _ -> return_maybe_decl - RnConstr _ _ -> return_maybe_decl - RnField _ _ -> return_maybe_decl - RnClassOp _ _ -> return_maybe_decl - RnImplicit _ -> if is_val_decl if_decl - then return_maybe_decl - else return_failed (badIfaceLookupErr "value" rn if_decl) + returnRn (new_version_map, new_decls_map) + } where - is_tycon_decl (TypeSig _ _ _) = True - is_tycon_decl (NewTypeSig _ _ _ _) = True - is_tycon_decl (DataSig _ _ _ _ _) = True - is_tycon_decl _ = False - - is_class_decl (ClassSig _ _ _ _) = True - is_class_decl _ = False - - is_val_decl (ValSig _ _ _) = True - is_val_decl (DataSig _ _ _ _ _) = True -- may be a constr or field - is_val_decl (NewTypeSig _ _ _ _) = True -- may be a constr - is_val_decl (ClassSig _ _ _ _) = True -- may be a method - is_val_decl _ = False -\end{code} - -\begin{code} -readIface :: FilePath -> Module - -> IO (MaybeErr ParsedIface Error) + -- newTopBinder puts into the cache the binder with the + -- module information set correctly. When the decl is later renamed, + -- the binding site will thereby get the correct module. + -- There maybe occurrences that don't have the correct Module, but + -- by the typechecker will propagate the binding definition to all + -- the occurrences, so that doesn't matter + new_name rdr_name loc = newTopBinder mod rdr_name loc -readIface file mod - = --hPutStr stderr (" reading "++file) >> - readFile file `thenPrimIO` \ read_result -> - case read_result of - Left err -> return (Failed (cannaeReadErr file err)) - Right contents -> --hPutStr stderr " parsing" >> - let parsed = parseIface contents in - --hPutStr stderr " done\n" >> - return ( - case parsed of - Failed _ -> parsed - Succeeded p -> Succeeded (init_merge mod p) - ) - where - init_merge this (ParsedIface mod _ v sv us vs exps insts fixes tdefs vdefs idefs prags) - = ParsedIface mod (False, unitBag this) v sv us vs exps insts fixes tdefs vdefs idefs prags + {- + If a signature decl is being loaded, and optIgnoreIfacePragmas is on, + we toss away unfolding information. + + Also, if the signature is loaded from a module we're importing from source, + we do the same. This is to avoid situations when compiling a pair of mutually + recursive modules, peering at unfolding info in the interface file of the other, + e.g., you compile A, it looks at B's interface file and may as a result change + its interface file. Hence, B is recompiled, maybe changing its interface file, + which will the unfolding info used in A to become invalid. Simple way out is to + just ignore unfolding info. + + [Jan 99: I junked the second test above. If we're importing from an hi-boot + file there isn't going to *be* any pragma info. Maybe the above comment + dates from a time where we picked up a .hi file first if it existed?] + -} + decl' = case decl of + SigD (IfaceSig name tp ls loc) | opt_IgnoreIfacePragmas + -> SigD (IfaceSig name tp [] loc) + other -> decl + +----------------------------------------------------- +-- Loading fixity decls +----------------------------------------------------- + +loadFixDecls mod_name decls + = mapRn (loadFixDecl mod_name) decls `thenRn` \ to_add -> + returnRn (mkNameEnv to_add) + +loadFixDecl mod_name sig@(FixitySig rdr_name fixity loc) + = newGlobalName mod_name (rdrNameOcc rdr_name) `thenRn` \ name -> + returnRn (name, fixity) + + +----------------------------------------------------- +-- Loading instance decls +----------------------------------------------------- + +loadInstDecl :: Module + -> IfaceInsts + -> RdrNameInstDecl + -> RnM d IfaceInsts +loadInstDecl mod insts decl@(InstDecl inst_ty binds uprags dfun_name src_loc) + = + -- Find out what type constructors and classes are "gates" for the + -- instance declaration. If all these "gates" are slurped in then + -- we should slurp the instance decl too. + -- + -- We *don't* want to count names in the context part as gates, though. + -- For example: + -- instance Foo a => Baz (T a) where ... + -- + -- Here the gates are Baz and T, but *not* Foo. + let + munged_inst_ty = removeContext inst_ty + free_names = extractHsTyRdrNames munged_inst_ty + in + setModuleRn mod $ + mapRn lookupOrigName free_names `thenRn` \ gate_names -> + returnRn ((mkNameSet gate_names, (mod, InstD decl)) `consBag` insts) + + +-- In interface files, the instance decls now look like +-- forall a. Foo a -> Baz (T a) +-- so we have to strip off function argument types as well +-- as the bit before the '=>' (which is always empty in interface files) +removeContext (HsForAllTy tvs cxt ty) = HsForAllTy tvs [] (removeFuns ty) +removeContext ty = removeFuns ty + +removeFuns (HsFunTy _ ty) = removeFuns ty +removeFuns ty = ty + + +----------------------------------------------------- +-- Loading Rules +----------------------------------------------------- + +loadRules :: Module -> IfaceRules + -> (Version, [RdrNameRuleDecl]) + -> RnM d (Version, IfaceRules) +loadRules mod rule_bag (version, rules) + | null rules || opt_IgnoreIfacePragmas + = returnRn (version, rule_bag) + | otherwise + = setModuleRn mod $ + mapRn (loadRule mod) rules `thenRn` \ new_rules -> + returnRn (version, rule_bag `unionBags` listToBag new_rules) + +loadRule :: Module -> RdrNameRuleDecl -> RnM d GatedDecl +-- "Gate" the rule simply by whether the rule variable is +-- needed. We can refine this later. +loadRule mod decl@(IfaceRule _ _ var _ _ src_loc) + = lookupOrigName var `thenRn` \ var_name -> + returnRn (unitNameSet var_name, (mod, RuleD decl)) + + +----------------------------------------------------- +-- Loading Deprecations +----------------------------------------------------- + +loadDeprecs :: Module -> [RdrNameDeprecation] -> RnM d Deprecations +loadDeprecs m [] = returnRn NoDeprecs +loadDeprecs m [Deprecation (IEModuleContents _) txt _] = returnRn (DeprecAll txt) +loadDeprecs m deprecs = setModuleRn m $ + foldlRn loadDeprec emptyNameEnv deprecs `thenRn` \ env -> + returnRn (DeprecSome env) +loadDeprec deprec_env (Deprecation ie txt _) + = mapRn lookupOrigName (ieNames ie) `thenRn` \ names -> + traceRn (text "Loaded deprecation(s) for" <+> hcat (punctuate comma (map ppr names)) <> colon <+> ppr txt) `thenRn_` + returnRn (extendNameEnvList deprec_env (zip names (repeat txt))) \end{code} -\begin{code} -rnIfaces :: IfaceCache -- iface cache (mutvar) - -> [Module] -- directly imported modules - -> UniqSupply - -> RnEnv -- defined (in the source) name env - -> RnEnv -- mentioned (in the source) name env - -> RenamedHsModule -- module to extend with iface decls - -> [RnName] -- imported names required (really the - -- same info as in mentioned name env) - -- Also, all the things we may look up - -- later by key (Unique). - -> IO (RenamedHsModule, -- extended module - RnEnv, -- final env (for renaming derivings) - ImplicitEnv, -- implicit names used (for usage info) - (UsagesMap,VersionsMap,[Module]), -- usage info - (Bag Error, Bag Warning)) - -rnIfaces iface_cache imp_mods us - def_env@((dqual, dunqual, dtc_qual, dtc_unqual), dstack) - occ_env@((qual, unqual, tc_qual, tc_unqual), stack) - rn_module@(HsModule modname iface_version exports imports fixities - typedecls typesigs classdecls instdecls instsigs - defdecls binds sigs src_loc) - todo - = {- - pprTrace "rnIfaces:going after:" (ppCat (map (ppr PprDebug) todo)) $ - - pprTrace "rnIfaces:qual:" (ppCat [ppBesides[ppPStr m,ppChar '.',ppPStr n] | (n,m) <- keysFM qual]) $ - pprTrace "rnIfaces:unqual:" (ppCat (map ppPStr (keysFM unqual))) $ - pprTrace "rnIfaces:tc_qual:" (ppCat [ppBesides[ppPStr m,ppChar '.',ppPStr n] | (n,m) <- keysFM tc_qual]) $ - pprTrace "rnIfaces:tc_unqual:" (ppCat (map ppPStr (keysFM tc_unqual))) $ - - pprTrace "rnIfaces:dqual:" (ppCat [ppBesides[ppPStr m,ppChar '.',ppPStr n] | (n,m) <- keysFM dqual]) $ - pprTrace "rnIfaces:dunqual:" (ppCat (map ppPStr (keysFM dunqual))) $ - pprTrace "rnIfaces:dtc_qual:" (ppCat [ppBesides[ppPStr m,ppChar '.',ppPStr n] | (n,m) <- keysFM dtc_qual]) $ - pprTrace "rnIfaces:dtc_unqual:"(ppCat (map ppPStr (keysFM dtc_unqual))) $ - -} +%********************************************************* +%* * +\subsection{Getting in a declaration} +%* * +%********************************************************* - -- do transitive closure to bring in all needed names/defns and insts: - - decls_and_insts todo def_env occ_env empty_return us - >>= \ (((if_typedecls, if_classdecls, if_instdecls, if_sigs), - if_implicits, - if_errs_warns), - if_final_env) -> - - -- finalize what we want to say we learned about the - -- things we used - finalIfaceInfo iface_cache modname if_final_env if_instdecls {-all_imports_used imp_mods-} >>= - \ usage_stuff@(usage_info, version_info, instance_mods) -> - - return (HsModule modname iface_version exports imports fixities - (typedecls ++ if_typedecls) - typesigs - (classdecls ++ if_classdecls) - (instdecls ++ if_instdecls) - instsigs defdecls binds - (sigs ++ if_sigs) - src_loc, - if_final_env, - if_implicits, - usage_stuff, - if_errs_warns) +\begin{code} +importDecl :: Name -> RnMG ImportDeclResult + +data ImportDeclResult + = AlreadySlurped + | WiredIn + | Deferred + | HereItIs (Module, RdrNameHsDecl) + +importDecl name + = -- Check if it was loaded before beginning this module + checkAlreadyAvailable name `thenRn` \ done -> + if done then + returnRn AlreadySlurped + else + + -- Check if we slurped it in while compiling this module + getIfacesRn `thenRn` \ ifaces -> + if name `elemNameSet` iSlurp ifaces then + returnRn AlreadySlurped + else + + -- Don't slurp in decls from this module's own interface file + -- (Indeed, this shouldn't happen.) + if isLocallyDefined name then + addWarnRn (importDeclWarn name) `thenRn_` + returnRn AlreadySlurped + else + + -- When we find a wired-in name we must load its home + -- module so that we find any instance decls lurking therein + if name `elemNameEnv` wiredInThingEnv then + loadHomeInterface doc name `thenRn_` + returnRn WiredIn + + else getNonWiredInDecl name where - decls_and_insts todo def_env occ_env to_return us - = do_decls todo -- initial batch of names to process - (def_env, occ_env, us1) -- init stuff down - to_return -- acc results - >>= \ (decls_return, - decls_def_env, - decls_occ_env) -> - - cacheInstModules iface_cache imp_mods >>= \ errs -> - - do_insts decls_def_env decls_occ_env emptyRnEnv emptyFM - (add_errs errs decls_return) us2 - where - (us1,us2) = splitUniqSupply us - - do_insts def_env occ_env prev_env done_insts to_return us - | size_tc_env occ_env == size_tc_env prev_env - = return (to_return, occ_env) - - | otherwise - = rnIfaceInstStuff iface_cache modname us1 occ_env done_insts to_return - >>= \ (insts_return, - new_insts, - insts_occ_env, - new_unknowns) -> - - do_decls new_unknowns -- new batch of names to process - (def_env, insts_occ_env, us2) -- init stuff down - insts_return -- acc results - >>= \ (decls_return, - decls_def_env, - decls_occ_env) -> - - do_insts decls_def_env decls_occ_env occ_env new_insts decls_return us3 - where - (us1,us') = splitUniqSupply us - (us2,us3) = splitUniqSupply us' - - size_tc_env ((_, _, qual, unqual), _) - = sizeFM qual + sizeFM unqual - - - do_decls :: [RnName] -- Names we're looking for; we keep adding/deleting - -- from this list; we're done when empty (nothing - -- more needs to be looked for) - -> Go_Down -- see defn below - -> To_Return -- accumulated result - -> IO (To_Return, - RnEnv, -- extended decl env - RnEnv) -- extended occ env - - do_decls to_find@[] down to_return - = return (to_return, defenv down, occenv down) - - do_decls to_find@(n:ns) down to_return - = case (lookup_defd down n) of - Just _ -> -- previous processing must've found the stuff for this name; - -- continue with the rest: - -- pprTrace "do_decls:done:" (ppr PprDebug n) $ - do_decls ns down to_return - - Nothing - | fst (moduleNamePair n) == modname -> - -- avoid looking in interface for the module being compiled - -- pprTrace "do_decls:this module error:" (ppr PprDebug n) $ - do_decls ns down (add_err (thisModImplicitErr modname n) to_return) - - | otherwise -> - -- OK, see what the cache has for us... - - cachedDeclByType iface_cache n >>= \ maybe_ans -> - case maybe_ans of - Failed err -> -- add the error, but keep going: - -- pprTrace "do_decls:cache error:" (ppr PprDebug n) $ - do_decls ns down (add_err err to_return) - - Succeeded iface_decl -> -- something needing renaming! - let - (us1, us2) = splitUniqSupply (uniqsupply down) - in - case (initRn False{-iface-} modname (occenv down) us1 ( - setExtraRn emptyUFM{-no fixities-} $ - rnIfaceDecl iface_decl)) of { - ((if_decl, if_defd, if_implicits), if_errs, if_warns) -> - let - new_unknowns = eltsFM (fst if_implicits) ++ eltsFM (snd if_implicits) - in - {- - pprTrace "do_decls:renamed:" (ppAboves [ppr PprDebug n - , ppCat [ppStr "new unknowns:", interpp'SP PprDebug new_unknowns] - , ppCat [ppStr "defd vals:", interpp'SP PprDebug [n | (_,n) <- fst if_defd] ] - , ppCat [ppStr "defd tcs:", interpp'SP PprDebug [n | (_,n) <- snd if_defd] ] - ]) $ - -} - do_decls (new_unknowns ++ ns) - (add_occs if_defd if_implicits $ - new_uniqsupply us2 down) - (add_decl if_decl $ - add_implicits if_implicits $ - add_errs if_errs $ - add_warns if_warns to_return) - } - ------------ -type Go_Down = (RnEnv, -- stuff we already have defns for; - -- to check quickly if we've already - -- found something for the name under consideration, - -- due to previous processing. - -- It starts off just w/ the defns for - -- the things in this module. - RnEnv, -- occurrence env; this gets added to as - -- we process new iface decls. It includes - -- entries for *all* occurrences, including those - -- for which we have definitions. - UniqSupply -- the obvious - ) - -lookup_defd (def_env, _, _) n - | isRnTyConOrClass n - = lookupTcRnEnv def_env (origName n) - | otherwise - = lookupRnEnv def_env (origName n) - -defenv (def_env, _, _) = def_env -occenv (_, occ_env, _) = occ_env -uniqsupply (_, _, us) = us - -new_uniqsupply us (def_env, occ_env, _) = (def_env, occ_env, us) - -add_occs (val_defds, tc_defds) (val_imps, tc_imps) (def_env, occ_env, us) - = case (extendGlobalRnEnv def_env val_defds tc_defds) of { (new_def_env, def_dups) -> - ASSERT(isEmptyBag def_dups) + doc = ptext SLIT("need home module for wired in thing") <+> ppr name + +getNonWiredInDecl :: Name -> RnMG ImportDeclResult +getNonWiredInDecl needed_name + = traceRn doc_str `thenRn_` + loadHomeInterface doc_str needed_name `thenRn` \ ifaces -> + case lookupNameEnv (iDecls ifaces) needed_name of + +{- OMIT DEFERRED STUFF FOR NOW, TILL GHCI WORKS + Just (version, avail, is_tycon_name, decl@(_, TyClD (TyData DataType _ _ _ _ ncons _ _ _ _ _))) + -- This case deals with deferred import of algebraic data types + + | not opt_NoPruneTyDecls + + && (opt_IgnoreIfacePragmas || ncons > 1) + -- We only defer if imported interface pragmas are ingored + -- or if it's not a product type. + -- Sole reason: The wrapper for a strict function may need to look + -- inside its arg, and hence need to see its arg type's constructors. + + && not (getUnique tycon_name `elem` cCallishTyKeys) + -- Never defer ccall types; we have to unbox them, + -- and importing them does no harm + + + -> -- OK, so we're importing a deferrable data type + if needed_name == tycon_name + -- The needed_name is the TyCon of a data type decl + -- Record that it's slurped, put it in the deferred set + -- and don't return a declaration at all + setIfacesRn (recordSlurp (ifaces {iDeferred = iDeferred ifaces + `addOneToNameSet` tycon_name}) + version (AvailTC needed_name [needed_name])) `thenRn_` + returnRn Deferred + + else + -- The needed name is a constructor of a data type decl, + -- getting a constructor, so remove the TyCon from the deferred set + -- (if it's there) and return the full declaration + setIfacesRn (recordSlurp (ifaces {iDeferred = iDeferred ifaces + `delFromNameSet` tycon_name}) + version avail) `thenRn_` + returnRn (HereItIs decl) + where + tycon_name = availName avail +-} + + Just (avail,_,decl) + -> setIfacesRn (recordSlurp ifaces avail) `thenRn_` + returnRn (HereItIs decl) + + Nothing + -> addErrRn (getDeclErr needed_name) `thenRn_` + returnRn AlreadySlurped + where + doc_str = ptext SLIT("need decl for") <+> ppr needed_name + +{- OMIT FOR NOW +getDeferredDecls :: RnMG [(Module, RdrNameHsDecl)] +getDeferredDecls + = getIfacesRn `thenRn` \ ifaces -> let - val_occs = val_defds ++ fmToList val_imps - tc_occs = tc_defds ++ fmToList tc_imps + decls_map = iDecls ifaces + deferred_names = nameSetToList (iDeferred ifaces) + get_abstract_decl n = case lookupNameEnv decls_map n of + Just (_, _, _, decl) -> decl in - case (extendGlobalRnEnv occ_env val_occs tc_occs) of { (new_occ_env, occ_dups) -> + traceRn (sep [text "getDeferredDecls", nest 4 (fsep (map ppr deferred_names))]) `thenRn_` + returnRn (map get_abstract_decl deferred_names) +-} +\end{code} --- ASSERT(isEmptyBag occ_dups) --- False because we may get a dup on the name we just shoved in +@getWiredInDecl@ maps a wired-in @Name@ to what it makes available. +It behaves exactly as if the wired in decl were actually in an interface file. +Specifically, +\begin{itemize} +\item if the wired-in name is a data type constructor or a data constructor, + it brings in the type constructor and all the data constructors; and + marks as ``occurrences'' any free vars of the data con. - (new_def_env, new_occ_env, us) }} +\item similarly for synonum type constructor ----------------- -type To_Return = (([RenamedTyDecl], [RenamedClassDecl], [RenamedInstDecl], [RenamedSig]), - ImplicitEnv, -- new names used implicitly - (Bag Error, Bag Warning) - ) +\item if the wired-in name is another wired-in Id, it marks as ``occurrences'' + the free vars of the Id's type. -empty_return :: To_Return -empty_return = (([],[],[],[]), emptyImplicitEnv, (emptyBag,emptyBag)) +\item it loads the interface file for the wired-in thing for the + sole purpose of making sure that its instance declarations are available +\end{itemize} +All this is necessary so that we know all types that are ``in play'', so +that we know just what instances to bring into scope. + -add_decl decl ((tydecls, classdecls, instdecls, sigs), implicit, msgs) - = case decl of - AddedTy t -> ((t:tydecls, classdecls, instdecls, sigs), implicit, msgs) - AddedClass c -> ((tydecls, c:classdecls, instdecls, sigs), implicit, msgs) - AddedSig s -> ((tydecls, classdecls, instdecls, s:sigs), implicit, msgs) -add_insts is ((tydecls, classdecls, instdecls, sigs), implicit, msgs) - = ((tydecls, classdecls, is ++ instdecls, sigs), implicit, msgs) + +%********************************************************* +%* * +\subsection{Getting what a module exports} +%* * +%********************************************************* -add_implicits (val_imps, tc_imps) (decls, (val_fm, tc_fm), msgs) - = (decls, (val_fm `plusFM` val_imps, tc_fm `plusFM` tc_imps), msgs) +@getInterfaceExports@ is called only for directly-imported modules. -add_err err (decls,implicit,(errs,warns)) = (decls,implicit,(errs `snocBag` err,warns)) -add_errs ers (decls,implicit,(errs,warns)) = (decls,implicit,(errs `unionBags` ers,warns)) -add_warns ws (decls,implicit,(errs,warns)) = (decls,implicit,(errs, warns `unionBags` ws)) +\begin{code} +getInterfaceExports :: ModuleName -> WhereFrom -> RnMG (Module, Avails) +getInterfaceExports mod_name from + = getHomeIfaceTableRn `thenRn` \ hit -> + case lookupModuleEnvByName hit mod_name of { + Just mi -> returnRn (mi_module mi, mi_exports mi) ; + Nothing -> + + loadInterface doc_str mod_name from `thenRn` \ ifaces -> + case lookupModuleEnvByName (iPIT ifaces) mod_name of + Just mi -> returnRn (mi_module mi, mi_exports mi) ; + -- loadInterface always puts something in the map + -- even if it's a fake + Nothing -> pprPanic "getInterfaceExports" (ppr mod_name) + } + where + doc_str = sep [ppr mod_name, ptext SLIT("is directly imported")] \end{code} + +%********************************************************* +%* * +\subsection{Instance declarations are handled specially} +%* * +%********************************************************* + \begin{code} -data AddedDecl -- purely local - = AddedTy RenamedTyDecl - | AddedClass RenamedClassDecl - | AddedSig RenamedSig - -rnIfaceDecl :: RdrIfaceDecl - -> RnM_Fixes _RealWorld - (AddedDecl, -- the resulting decl to add to the pot - ([(RdrName,RnName)], [(RdrName,RnName)]), - -- new val/tycon-class names that have - -- *been defined* while processing this decl - ImplicitEnv -- new implicit val/tycon-class names that we - -- stumbled into - ) - -rnIfaceDecl (TypeSig tc _ decl) - = rnTyDecl decl `thenRn` \ rn_decl -> - lookupTyCon tc `thenRn` \ rn_tc -> - getImplicitUpRn `thenRn` \ mentioned -> +getImportedInstDecls :: NameSet -> RnMG [(Module,RdrNameHsDecl)] +getImportedInstDecls gates + = -- First, load any orphan-instance modules that aren't aready loaded + -- Orphan-instance modules are recorded in the module dependecnies + getIfacesRn `thenRn` \ ifaces -> let - defds = ([], [(tc, rn_tc)]) - implicits = mentioned `sub` defds + orphan_mods = + [mod | (mod, (True, _, False)) <- fmToList (iImpModInfo ifaces)] in - returnRn (AddedTy rn_decl, defds, implicits) + loadOrphanModules orphan_mods `thenRn_` -rnIfaceDecl (NewTypeSig tc dc _ decl) - = rnTyDecl decl `thenRn` \ rn_decl -> - lookupTyCon tc `thenRn` \ rn_tc -> - lookupValue dc `thenRn` \ rn_dc -> - getImplicitUpRn `thenRn` \ mentioned -> + -- Now we're ready to grab the instance declarations + -- Find the un-gated ones and return them, + -- removing them from the bag kept in Ifaces + getIfacesRn `thenRn` \ ifaces -> let - defds = ([(dc, rn_dc)], [(tc, rn_tc)]) - implicits = mentioned `sub` defds + (decls, new_insts) = selectGated gates (iInsts ifaces) in - returnRn (AddedTy rn_decl, defds, implicits) - -rnIfaceDecl (DataSig tc dcs fcs _ decl) - = rnTyDecl decl `thenRn` \ rn_decl -> - lookupTyCon tc `thenRn` \ rn_tc -> - mapRn lookupValue dcs `thenRn` \ rn_dcs -> - mapRn lookupValue fcs `thenRn` \ rn_fcs -> - getImplicitUpRn `thenRn` \ mentioned -> + setIfacesRn (ifaces { iInsts = new_insts }) `thenRn_` + + traceRn (sep [text "getImportedInstDecls:", + nest 4 (fsep (map ppr gate_list)), + text "Slurped" <+> int (length decls) <+> text "instance declarations", + nest 4 (vcat (map ppr_brief_inst_decl decls))]) `thenRn_` + returnRn decls + where + gate_list = nameSetToList gates + +ppr_brief_inst_decl (mod, InstD (InstDecl inst_ty _ _ _ _)) + = case inst_ty of + HsForAllTy _ _ tau -> ppr tau + other -> ppr inst_ty + +getImportedRules :: RnMG [(Module,RdrNameHsDecl)] +getImportedRules + | opt_IgnoreIfacePragmas = returnRn [] + | otherwise + = getIfacesRn `thenRn` \ ifaces -> let - defds = (zip dcs rn_dcs ++ zip fcs rn_fcs , [(tc, rn_tc)]) - implicits = mentioned `sub` defds + gates = iSlurp ifaces -- Anything at all that's been slurped + rules = iRules ifaces + (decls, new_rules) = selectGated gates rules in - returnRn (AddedTy rn_decl, defds, implicits) + if null decls then + returnRn [] + else + setIfacesRn (ifaces { iRules = new_rules }) `thenRn_` + traceRn (sep [text "getImportedRules:", + text "Slurped" <+> int (length decls) <+> text "rules"]) `thenRn_` + returnRn decls + +selectGated gates decl_bag + -- Select only those decls whose gates are *all* in 'gates' +#ifdef DEBUG + | opt_NoPruneDecls -- Just to try the effect of not gating at all + = (foldrBag (\ (_,d) ds -> d:ds) [] decl_bag, emptyBag) -- Grab them all + + | otherwise +#endif + = foldrBag select ([], emptyBag) decl_bag + where + select (reqd, decl) (yes, no) + | isEmptyNameSet (reqd `minusNameSet` gates) = (decl:yes, no) + | otherwise = (yes, (reqd,decl) `consBag` no) + +lookupFixityRn :: Name -> RnMS Fixity +lookupFixityRn name + | isLocallyDefined name + = getFixityEnv `thenRn` \ local_fix_env -> + returnRn (lookupLocalFixity local_fix_env name) + + | otherwise -- Imported + -- For imported names, we have to get their fixities by doing a loadHomeInterface, + -- and consulting the Ifaces that comes back from that, because the interface + -- file for the Name might not have been loaded yet. Why not? Suppose you import module A, + -- which exports a function 'f', which is defined in module B. Then B isn't loaded + -- right away (after all, it's possible that nothing from B will be used). + -- When we come across a use of 'f', we need to know its fixity, and it's then, + -- and only then, that we load B.hi. That is what's happening here. + = getHomeIfaceTableRn `thenRn` \ hst -> + case lookupFixityEnv hst name of { + Just fixity -> returnRn fixity ; + Nothing -> + + loadHomeInterface doc name `thenRn` \ ifaces -> + returnRn (lookupFixityEnv (iPIT ifaces) name `orElse` defaultFixity) + } + where + doc = ptext SLIT("Checking fixity for") <+> ppr name +\end{code} + + +%********************************************************* +%* * +\subsection{Keeping track of what we've slurped, and version numbers} +%* * +%********************************************************* + +getImportVersions figures out what the ``usage information'' for this +moudule is; that is, what it must record in its interface file as the +things it uses. It records: + +\begin{itemize} +\item (a) anything reachable from its body code +\item (b) any module exported with a @module Foo@ +\item (c) anything reachable from an exported item +\end{itemize} + +Why (b)? Because if @Foo@ changes then this module's export list +will change, so we must recompile this module at least as far as +making a new interface file --- but in practice that means complete +recompilation. + +Why (c)? Consider this: +\begin{verbatim} + module A( f, g ) where | module B( f ) where + import B( f ) | f = h 3 + g = ... | h = ... +\end{verbatim} + +Here, @B.f@ isn't used in A. Should we nevertheless record @B.f@ in +@A@'s usages? Our idea is that we aren't going to touch A.hi if it is +*identical* to what it was before. If anything about @B.f@ changes +than anyone who imports @A@ should be recompiled in case they use +@B.f@ (they'll get an early exit if they don't). So, if anything +about @B.f@ changes we'd better make sure that something in A.hi +changes, and the convenient way to do that is to record the version +number @B.f@ in A.hi in the usage list. If B.f changes that'll force a +complete recompiation of A, which is overkill but it's the only way to +write a new, slightly different, A.hi. + +But the example is tricker. Even if @B.f@ doesn't change at all, +@B.h@ may do so, and this change may not be reflected in @f@'s version +number. But with -O, a module that imports A must be recompiled if +@B.h@ changes! So A must record a dependency on @B.h@. So we treat +the occurrence of @B.f@ in the export list *just as if* it were in the +code of A, and thereby haul in all the stuff reachable from it. + +[NB: If B was compiled with -O, but A isn't, we should really *still* +haul in all the unfoldings for B, in case the module that imports A *is* +compiled with -O. I think this is the case.] + +Even if B is used at all we get a usage line for B + import B :: ... ; +in A.hi, to record the fact that A does import B. This is used to decide +to look to look for B.hi rather than B.hi-boot when compiling a module that +imports A. This line says that A imports B, but uses nothing in it. +So we'll get an early bale-out when compiling A if B's version changes. + +\begin{code} +mkImportInfo :: ModuleName -- Name of this module + -> [ImportDecl n] -- The import decls + -> RnMG [ImportVersion Name] -rnIfaceDecl (ClassSig clas ops _ decl) - = rnClassDecl decl `thenRn` \ rn_decl -> - lookupClass clas `thenRn` \ rn_clas -> - mapRn (lookupClassOp rn_clas) ops `thenRn` \ rn_ops -> - getImplicitUpRn `thenRn` \ mentioned -> +mkImportInfo this_mod imports + = getIfacesRn `thenRn` \ ifaces -> + getHomeIfaceTableRn `thenRn` \ hit -> let - defds = (ops `zip` rn_ops, [(clas, rn_clas)]) - implicits = mentioned `sub` defds + import_all_mods :: [ModuleName] + -- Modules where we imported all the names + -- (apart from hiding some, perhaps) + import_all_mods = nub [ m | ImportDecl m _ _ _ imp_list _ <- imports, + import_all imp_list ] + + import_all (Just (False, _)) = False -- Imports are specified explicitly + import_all other = True -- Everything is imported + + mod_map = iImpModInfo ifaces + imp_names = iVSlurp ifaces + pit = iPIT ifaces + + -- mv_map groups together all the things imported from a particular module. + mv_map :: ModuleEnv [Name] + mv_map = foldr add_mv emptyModuleEnv imp_names + + add_mv name mv_map = addItem mv_map (nameModule name) name + + -- Build the result list by adding info for each module. + -- For (a) a library module, we don't record it at all unless it contains orphans + -- (We must never lose track of orphans.) + -- + -- (b) a source-imported module, don't record the dependency at all + -- + -- (b) may seem a bit strange. The idea is that the usages in a .hi file records + -- *all* the module's dependencies other than the loop-breakers. We use + -- this info in findAndReadInterface to decide whether to look for a .hi file or + -- a .hi-boot file. + -- + -- This means we won't track version changes, or orphans, from .hi-boot files. + -- The former is potentially rather bad news. It could be fixed by recording + -- whether something is a boot file along with the usage info for it, but + -- I can't be bothered just now. + + mk_imp_info mod_name (has_orphans, is_boot, opened) so_far + | mod_name == this_mod -- Check if M appears in the set of modules 'below' M + -- This seems like a convenient place to check + = WARN( not is_boot, ptext SLIT("Wierd:") <+> ppr this_mod <+> + ptext SLIT("imports itself (perhaps indirectly)") ) + so_far + + | not opened -- We didn't even open the interface + = -- This happens when a module, Foo, that we explicitly imported has + -- 'import Baz' in its interface file, recording that Baz is below + -- Foo in the module dependency hierarchy. We want to propagate this + -- information. The Nothing says that we didn't even open the interface + -- file but we must still propagate the dependency info. + -- The module in question must be a local module (in the same package) + go_for_it NothingAtAll + + + | is_lib_module && not has_orphans + = so_far + + | is_lib_module -- Record the module version only + = go_for_it (Everything module_vers) + + | otherwise + = go_for_it whats_imported + + where + go_for_it exports = (mod_name, has_orphans, is_boot, exports) : so_far + mod_iface = lookupIface hit pit mod_name + mod = mi_module mod_iface + is_lib_module = not (isModuleInThisPackage mod) + version_info = mi_version mod_iface + version_env = vers_decls version_info + module_vers = vers_module version_info + + whats_imported = Specifically module_vers + export_vers import_items + (vers_rules version_info) + + import_items = [(n,v) | n <- lookupWithDefaultModuleEnv mv_map [] mod, + let v = lookupNameEnv version_env n `orElse` + pprPanic "mk_whats_imported" (ppr n) + ] + export_vers | moduleName mod `elem` import_all_mods + = Just (vers_exports version_info) + | otherwise + = Nothing + + import_info = foldFM mk_imp_info [] mod_map + in + traceRn (text "Modules in Ifaces: " <+> fsep (map ppr (keysFM mod_map))) `thenRn_` + returnRn import_info + + +addItem :: ModuleEnv [a] -> Module -> a -> ModuleEnv [a] +addItem fm mod x = extendModuleEnv_C add_item fm mod [x] + where + add_item xs _ = x:xs +\end{code} + +\begin{code} +getSlurped + = getIfacesRn `thenRn` \ ifaces -> + returnRn (iSlurp ifaces) + +recordSlurp ifaces@(Ifaces { iSlurp = slurped_names, iVSlurp = imp_names }) + avail + = let + new_slurped_names = addAvailToNameSet slurped_names avail + new_imp_names = availName avail : imp_names in - returnRn (AddedClass rn_decl, defds, implicits) - -rnIfaceDecl (ValSig f src_loc ty) - -- should rename_sig in RnBinds be used here? ToDo - = lookupValue f `thenRn` \ rn_f -> - -- pprTrace "rnIfaceDecl:ValSig:" (ppr PprDebug ty) $ - rnPolyType nullTyVarNamesEnv ty `thenRn` \ rn_ty -> - getImplicitUpRn `thenRn` \ mentioned -> + ifaces { iSlurp = new_slurped_names, iVSlurp = new_imp_names } + +recordLocalSlurps local_avails + = getIfacesRn `thenRn` \ ifaces -> let - defds = ([(f, rn_f)], []) - implicits = mentioned `sub` defds + new_slurped_names = foldl addAvailToNameSet (iSlurp ifaces) local_avails in - returnRn (AddedSig (Sig rn_f rn_ty noGenPragmas src_loc), defds, implicits) + setIfacesRn (ifaces { iSlurp = new_slurped_names }) +\end{code} ----- -sub :: ImplicitEnv -> ([(RdrName,RnName)], [(RdrName,RnName)]) -> ImplicitEnv -sub (val_ment, tc_ment) (val_defds, tc_defds) - = (delListFromFM val_ment (map fst val_defds), - delListFromFM tc_ment (map fst tc_defds)) -\end{code} +%********************************************************* +%* * +\subsection{Getting binders out of a declaration} +%* * +%********************************************************* -% ------------------------------ +@getDeclBinders@ returns the names for a @RdrNameHsDecl@. +It's used for both source code (from @availsFromDecl@) and interface files +(from @loadDecl@). -@cacheInstModules@: cache instance modules specified in imports +It doesn't deal with source-code specific things: @ValD@, @DefD@. They +are handled by the sourc-code specific stuff in @RnNames@. \begin{code} -cacheInstModules :: IfaceCache -> [Module] -> IO (Bag Error) -cacheInstModules iface_cache imp_mods - = readVar iface_cache `thenPrimIO` \ (iface_fm, _, _) -> - let - imp_ifaces = [ iface | Just iface <- map (lookupFM iface_fm) imp_mods ] - (imp_imods, _) = removeDups cmpPString (bagToList (unionManyBags (map get_ims imp_ifaces))) - get_ims (ParsedIface _ _ _ _ _ _ _ ims _ _ _ _ _) = ims - in - accumulate (map (cachedIface False iface_cache) imp_imods) >>= \ err_or_ifaces -> +getDeclBinders :: (RdrName -> SrcLoc -> RnM d Name) -- New-name function + -> RdrNameHsDecl + -> RnM d (Maybe AvailInfo) - -- Sanity Check: - -- Assert that instance modules given by direct imports contains - -- instance modules extracted from all visited modules +getDeclBinders new_name (TyClD (TyData _ _ tycon _ condecls _ _ _ src_loc _ _)) + = new_name tycon src_loc `thenRn` \ tycon_name -> + getConFieldNames new_name condecls `thenRn` \ sub_names -> + returnRn (Just (AvailTC tycon_name (tycon_name : nub sub_names))) + -- The "nub" is because getConFieldNames can legitimately return duplicates, + -- when a record declaration has the same field in multiple constructors - readVar iface_cache `thenPrimIO` \ (all_iface_fm, _, _) -> +getDeclBinders new_name (TyClD (TySynonym tycon _ _ src_loc)) + = new_name tycon src_loc `thenRn` \ tycon_name -> + returnRn (Just (AvailTC tycon_name [tycon_name])) + +getDeclBinders new_name (TyClD (ClassDecl _ cname _ _ sigs _ _ _ src_loc)) + = new_name cname src_loc `thenRn` \ class_name -> + + -- Record the names for the class ops let - all_ifaces = eltsFM all_iface_fm - (all_imods, _) = removeDups cmpPString (bagToList (unionManyBags (map get_ims (all_ifaces)))) + -- just want class-op sigs + op_sigs = filter isClassOpSig sigs in - ASSERT(sortLt (<) imp_imods == sortLt (<) all_imods) + mapRn (getClassOpNames new_name) op_sigs `thenRn` \ sub_names -> - return (bag_errs err_or_ifaces) - where - bag_errs [] = emptyBag - bag_errs (Failed err :rest) = err `consBag` bag_errs rest - bag_errs (Succeeded _:rest) = bag_errs rest -\end{code} + returnRn (Just (AvailTC class_name (class_name : sub_names))) +getDeclBinders new_name (SigD (IfaceSig var ty prags src_loc)) + = new_name var src_loc `thenRn` \ var_name -> + returnRn (Just (Avail var_name)) -@rnIfaceInstStuff@: Deal with instance declarations from interface files. +getDeclBinders new_name (FixD _) = returnRn Nothing +getDeclBinders new_name (DeprecD _) = returnRn Nothing -\begin{code} -type InstanceEnv = FiniteMap (RdrName, RdrName) Int - -rnIfaceInstStuff - :: IfaceCache -- all about ifaces we've read - -> Module - -> UniqSupply - -> RnEnv -- current occ env - -> InstanceEnv -- instances for these tycon/class pairs done - -> To_Return - -> IO (To_Return, - InstanceEnv, -- extended instance env - RnEnv, -- final occ env - [RnName]) -- new unknown names - -rnIfaceInstStuff iface_cache modname us occ_env done_inst_env to_return - = -- all the instance decls we might even want to consider - -- are in the ParsedIfaces that are in our cache - - readVar iface_cache `thenPrimIO` \ (_, orig_iface_fm, _) -> - let - all_ifaces = eltsFM orig_iface_fm - all_insts = unionManyBags (map get_insts all_ifaces) - interesting_insts = filter want_inst (bagToList all_insts) + -- foreign declarations +getDeclBinders new_name (ForD (ForeignDecl nm kind _ dyn _ loc)) + | binds_haskell_name kind dyn + = new_name nm loc `thenRn` \ name -> + returnRn (Just (Avail name)) - -- Sanity Check: - -- Assert that there are no more instances for the done instances + | otherwise -- a foreign export + = lookupOrigName nm `thenRn_` + returnRn Nothing - claim_done = filter is_done_inst (bagToList all_insts) - claim_done_env = foldr add_done_inst emptyFM claim_done - has_val fm (k,i) = case lookupFM fm k of { Nothing -> False; Just v -> i == v } - in - {- - pprTrace "all_insts:\n" (ppr_insts (bagToList all_insts)) $ - pprTrace "interesting_insts:\n" (ppr_insts interesting_insts) $ - -} - ASSERT(sizeFM done_inst_env == sizeFM claim_done_env) - ASSERT(all (has_val claim_done_env) (fmToList done_inst_env)) - - case (initRn False{-iface-} modname occ_env us ( - setExtraRn emptyUFM{-no fixities-} $ - mapRn rnIfaceInst interesting_insts `thenRn` \ insts -> - getImplicitUpRn `thenRn` \ implicits -> - returnRn (insts, implicits))) of { - ((if_insts, if_implicits), if_errs, if_warns) -> - - return (add_insts if_insts $ - add_implicits if_implicits $ - add_errs if_errs $ - add_warns if_warns to_return, - foldr add_done_inst done_inst_env interesting_insts, - add_imp_occs if_implicits occ_env, - eltsFM (fst if_implicits) ++ eltsFM (snd if_implicits)) - } +getDeclBinders new_name (DefD _) = returnRn Nothing +getDeclBinders new_name (InstD _) = returnRn Nothing +getDeclBinders new_name (RuleD _) = returnRn Nothing + +binds_haskell_name (FoImport _) _ = True +binds_haskell_name FoLabel _ = True +binds_haskell_name FoExport ext_nm = isDynamicExtName ext_nm + +---------------- +getConFieldNames new_name (ConDecl con _ _ _ (RecCon fielddecls) src_loc : rest) + = mapRn (\n -> new_name n src_loc) (con:fields) `thenRn` \ cfs -> + getConFieldNames new_name rest `thenRn` \ ns -> + returnRn (cfs ++ ns) where - get_insts (ParsedIface _ _ _ _ _ _ _ _ _ _ _ insts _) = insts - - add_done_inst (InstSig clas tycon _ _) inst_env - = addToFM_C (+) inst_env (tycon,clas) 1 - - is_done_inst (InstSig clas tycon _ _) - = maybeToBool (lookupFM done_inst_env (tycon,clas)) - - add_imp_occs (val_imps, tc_imps) occ_env - = case extendGlobalRnEnv occ_env (fmToList val_imps) (fmToList tc_imps) of - (ext_occ_env, occ_dups) -> ASSERT(isEmptyBag occ_dups) - ext_occ_env - - want_inst i@(InstSig clas tycon _ _) - = -- it's a "good instance" (one to hang onto) if we have a - -- chance of referring to *both* the class and tycon later on ... - - mentionable tycon && mentionable clas && not (is_done_inst i) - where - mentionable nm - = case lookupTcRnEnv occ_env nm of - Just _ -> True - Nothing -> -- maybe it's builtin - case nm of - Qual _ _ -> False - Unqual n -> - case (lookupFM b_tc_names n) of - Just _ -> True - Nothing -> maybeToBool (lookupFM b_keys n) - - (b_tc_names, b_keys) -- pretty UGLY ... - = case builtinNameInfo of ((_,builtin_tcs),b_keys,_) -> (builtin_tcs,b_keys) - - ppr_insts insts - = ppAboves (map ppr_inst insts) - where - ppr_inst (InstSig c t _ inst_decl) - = ppCat [ppr PprDebug c, ppr PprDebug t, ppr PprDebug inst_decl] -\end{code} + fields = concat (map fst fielddecls) -\begin{code} -rnIfaceInst :: RdrIfaceInst -> RnM_Fixes _RealWorld RenamedInstDecl +getConFieldNames new_name (ConDecl con _ _ _ condecl src_loc : rest) + = new_name con src_loc `thenRn` \ n -> + getConFieldNames new_name rest `thenRn` \ ns -> + returnRn (n : ns) -rnIfaceInst (InstSig _ _ _ inst_decl) = rnInstDecl inst_decl +getConFieldNames new_name [] = returnRn [] + +getClassOpNames new_name (ClassOpSig op _ _ src_loc) = new_name op src_loc \end{code} +@getDeclSysBinders@ gets the implicit binders introduced by a decl. +A the moment that's just the tycon and datacon that come with a class decl. +They aren't returned by @getDeclBinders@ because they aren't in scope; +but they {\em should} be put into the @DeclsMap@ of this module. + +Note that this excludes the default-method names of a class decl, +and the dict fun of an instance decl, because both of these have +bindings of their own elsewhere. + \begin{code} -finalIfaceInfo :: - IfaceCache -- iface cache - -> Module -- this module's name - -> RnEnv - -> [RenamedInstDecl] --- -> [RnName] -- all imported names required --- -> [Module] -- directly imported modules - -> IO (UsagesMap, - VersionsMap, -- info about version numbers - [Module]) -- special instance modules - -finalIfaceInfo iface_cache modname if_final_env@((qual, unqual, tc_qual, tc_unqual), stack) if_instdecls - = - pprTrace "usageIf:qual:" (ppCat [ppBesides[ppPStr m,ppChar '.',ppPStr n] | (n,m) <- keysFM qual]) $ --- pprTrace "usageIf:unqual:" (ppCat (map ppPStr (keysFM unqual))) $ - pprTrace "usageIf:tc_qual:" (ppCat [ppBesides[ppPStr m,ppChar '.',ppPStr n] | (n,m) <- keysFM tc_qual]) $ --- pprTrace "usageIf:tc_unqual:" (ppCat (map ppPStr (keysFM tc_unqual))) $ - let - val_stuff@(val_usages, val_versions) - = foldFM process_item (emptyFM, emptyFM){-init-} qual +getDeclSysBinders new_name (TyClD (ClassDecl _ cname _ _ sigs _ _ names + src_loc)) + = sequenceRn [new_name n src_loc | n <- names] - (all_usages, all_versions) - = foldFM process_item val_stuff{-keep going-} tc_qual - in - return (all_usages, all_versions, []) - where - process_item :: (FAST_STRING,Module) -> RnName -- RnEnv (QualNames) components - -> (UsagesMap, VersionsMap) -- input - -> (UsagesMap, VersionsMap) -- output - - process_item (n,m) rn as_before@(usages, versions) - | irrelevant rn - = as_before - | m == modname -- this module => add to "versions" - = (usages, addToFM versions n 1{-stub-}) - | otherwise -- from another module => add to "usages" - = (add_to_usages usages m n 1{-stub-}, versions) - - irrelevant (RnConstr _ _) = True -- We don't report these in their - irrelevant (RnField _ _) = True -- own right in usages/etc. - irrelevant (RnClassOp _ _) = True - irrelevant _ = False - - add_to_usages usages m n version - = addToFM usages m ( - case (lookupFM usages m) of - Nothing -> -- nothing for this module yet... - (1{-stub-}, unitFM n version) - - Just (mversion, mstuff) -> -- the "new" stuff will shadow the old - (mversion, addToFM mstuff n version) - ) +getDeclSysBinders new_name (TyClD (TyData _ _ _ _ cons _ _ _ _ _ _)) + = sequenceRn [new_name wkr_name src_loc | ConDecl _ wkr_name _ _ _ src_loc <- cons] + +getDeclSysBinders new_name other_decl + = returnRn [] \end{code} +%********************************************************* +%* * +\subsection{Reading an interface file} +%* * +%********************************************************* \begin{code} -thisModImplicitErr mod n sty - = ppCat [ppPStr SLIT("Implicit import of"), ppr sty n, ppPStr SLIT("when compiling"), ppPStr mod] +findAndReadIface :: SDoc -> ModuleName + -> IsBootInterface -- True <=> Look for a .hi-boot file + -- False <=> Look for .hi file + -> RnM d (Either Message (Module, ParsedIface)) + -- Nothing <=> file not found, or unreadable, or illegible + -- Just x <=> successfully found and parsed + +findAndReadIface doc_str mod_name hi_boot_file + = traceRn trace_msg `thenRn_` + -- we keep two maps for interface files, + -- one for 'normal' ones, the other for .hi-boot files, + -- hence the need to signal which kind we're interested. + + getFinderRn `thenRn` \ finder -> + ioToRnM (finder mod_name) `thenRn` \ maybe_found -> + + case maybe_found of + Right (Just (mod,locn)) + | hi_boot_file -> readIface mod (hi_file locn ++ "-hi-boot") + | otherwise -> readIface mod (hi_file locn) + + -- Can't find it + other -> traceRn (ptext SLIT("...not found")) `thenRn_` + returnRn (Left (noIfaceErr mod_name hi_boot_file)) -noIfaceErr mod sty - = ppCat [ppPStr SLIT("Could not find interface for:"), ppPStr mod] + where + trace_msg = sep [hsep [ptext SLIT("Reading"), + if hi_boot_file then ptext SLIT("[boot]") else empty, + ptext SLIT("interface for"), + ppr mod_name <> semi], + nest 4 (ptext SLIT("reason:") <+> doc_str)] +\end{code} -noOrigIfaceErr mod sty - = ppCat [ppPStr SLIT("Could not find original interface for:"), ppPStr mod] +@readIface@ tries just the one file. -noDeclInIfaceErr mod str sty - = ppBesides [ppPStr SLIT("Could not find interface declaration of: "), - ppPStr mod, ppStr ".", ppPStr str] +\begin{code} +readIface :: Module -> String -> RnM d (Either Message (Module, ParsedIface)) + -- Nothing <=> file not found, or unreadable, or illegible + -- Just x <=> successfully found and parsed +readIface wanted_mod file_path + = traceRn (ptext SLIT("...reading from") <+> text file_path) `thenRn_` + ioToRnM (hGetStringBuffer False file_path) `thenRn` \ read_result -> + case read_result of + Right contents -> + case parseIface contents + PState{ bol = 0#, atbol = 1#, + context = [], + glasgow_exts = 1#, + loc = mkSrcLoc (mkFastString file_path) 1 } of + POk _ (PIface iface) -> + warnCheckRn (wanted_mod == read_mod) + (hiModuleNameMismatchWarn wanted_mod read_mod) `thenRn_` + returnRn (Right (wanted_mod, iface)) + where + read_mod = pi_mod iface + + PFailed err -> bale_out err + parse_result -> bale_out empty + -- This last case can happen if the interface file is (say) empty + -- in which case the parser thinks it looks like an IdInfo or + -- something like that. Just an artefact of the fact that the + -- parser is used for several purposes at once. + + Left io_err -> bale_out (text (show io_err)) + where + bale_out err = returnRn (Left (badIfaceFile file_path err)) +\end{code} -cannaeReadErr file err sty - = ppBesides [ppPStr SLIT("Failed in reading file: "), ppStr file, ppStr "; error=", ppStr (show err)] +%********************************************************* +%* * +\subsection{Errors} +%* * +%********************************************************* -ifaceLookupWiredErr msg n sty - = ppBesides [ppPStr SLIT("Why am I looking up a wired-in "), ppStr msg, ppChar ':', ppr sty n] +\begin{code} +noIfaceErr mod_name boot_file + = ptext SLIT("Could not find interface file for") <+> quotes (ppr mod_name) + -- We used to print the search path, but we can't do that + -- now, becuase it's hidden inside the finder. + -- Maybe the finder should expose more functions. + +badIfaceFile file err + = vcat [ptext SLIT("Bad interface file:") <+> text file, + nest 4 err] + +getDeclErr name + = vcat [ptext SLIT("Failed to find interface decl for") <+> quotes (ppr name), + ptext SLIT("from module") <+> quotes (ppr (nameModule name)) + ] + +importDeclWarn name + = sep [ptext SLIT( + "Compiler tried to import decl from interface file with same name as module."), + ptext SLIT( + "(possible cause: module name clashes with interface file already in scope.)") + ] $$ + hsep [ptext SLIT("name:"), quotes (ppr name)] + +warnRedundantSourceImport mod_name + = ptext SLIT("Unnecessary {- SOURCE -} in the import of module") + <+> quotes (ppr mod_name) + +hiModuleNameMismatchWarn :: Module -> Module -> Message +hiModuleNameMismatchWarn requested_mod read_mod = + hsep [ ptext SLIT("Something is amiss; requested module name") + , ppr (moduleName requested_mod) + , ptext SLIT("differs from name found in the interface file") + , ppr read_mod + ] -badIfaceLookupErr msg name decl sty - = ppBesides [ppPStr SLIT("Expected a "), ppStr msg, ppPStr SLIT(" declaration, but got this: ???")] \end{code}