X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnIfaces.lhs;h=ff3f51c80c79f532444421de0b5d5bbaea6a8337;hb=783e505e2d884f94d30ec8074e590507f2561c49;hp=97445c9c62e117e60759cc99d5e47514f5283a3c;hpb=68afb16743cafd5b7495771d359891c6dfc5a186;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnIfaces.lhs b/ghc/compiler/rename/RnIfaces.lhs index 97445c9..ff3f51c 100644 --- a/ghc/compiler/rename/RnIfaces.lhs +++ b/ghc/compiler/rename/RnIfaces.lhs @@ -1,862 +1,1078 @@ % -% (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 + getInterfaceExports, + getImportedInstDecls, getImportedRules, + lookupFixity, loadHomeInterface, + importDecl, recordSlurp, + getImportVersions, getSlurped, -import Ubiq + checkUpToDate, -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_IgnoreIfacePragmas ) +import HsSyn ( HsDecl(..), TyClDecl(..), InstDecl(..), IfaceSig(..), + HsType(..), ConDecl(..), IE(..), ConDetails(..), Sig(..), + ForeignDecl(..), ForKind(..), isDynamicExtName, + FixitySig(..), RuleDecl(..), + isClassOpSig, Deprecation(..) + ) +import BasicTypes ( Version, NewOrData(..), defaultFixity ) +import RdrHsSyn ( RdrNameHsDecl, RdrNameInstDecl, RdrNameTyClDecl, RdrNameRuleDecl, + extractHsTyRdrNames, RdrNameDeprecation ) +import RnEnv ( mkImportedGlobalName, newImportedBinder, mkImportedGlobalFromRdrName, + lookupOccRn, lookupImplicitOccRn, + pprAvail, + availName, availNames, addAvailToNameSet, addSysAvails, + FreeVars, emptyFVs + ) +import RnMonad +import RnHsSyn ( RenamedHsDecl, RenamedDeprecation ) +import ParseIface ( parseIface, IfaceStuff(..) ) -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 FiniteMap ( FiniteMap, sizeFM, emptyFM, delFromFM, listToFM, + lookupFM, addToFM, addToFM_C, addListToFM, + fmToList, elemFM, foldFM ) -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-} ) +import Name ( Name {-instance NamedThing-}, + nameModule, isLocallyDefined, + isWiredInName, nameUnique, NamedThing(..) + ) +import Module ( Module, moduleString, pprModule, + mkVanillaModule, pprModuleName, + moduleUserString, moduleName, isLibModule, + ModuleName, WhereFrom(..), + ) +import RdrName ( RdrName, rdrNameOcc ) +import NameSet +import Var ( Id ) +import SrcLoc ( mkSrcLoc, SrcLoc ) +import PrelMods ( pREL_GHC ) +import PrelInfo ( cCallishTyKeys ) +import Bag +import Maybes ( MaybeErr(..), maybeToBool, orElse ) +import ListSetOps ( unionLists ) +import Outputable +import Unique ( Unique ) +import StringBuffer ( StringBuffer, hGetStringBuffer ) +import FastString ( mkFastString ) +import ErrUtils ( Message ) +import Lex +import Outputable + +import IO ( isDoesNotExistError ) +import List ( nub ) \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} -* * -********************************************************* +%********************************************************* +%* * +\subsection{Loading a new interface file} +%* * +%********************************************************* -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 +loadHomeInterface :: SDoc -> Name -> RnM d Ifaces +loadHomeInterface doc_str name + = loadInterface doc_str (moduleName (nameModule name)) ImportBySystem `thenRn` \ (_, ifaces) -> + returnRn ifaces + +loadOrphanModules :: [ModuleName] -> RnM d () +loadOrphanModules mods + | null mods = returnRn () + | otherwise = traceRn (text "Loading orphan modules:" <+> fsep (map pprModuleName mods)) `thenRn_` + mapRn_ load mods `thenRn_` + returnRn () 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 == '_' -\end{code} + load mod = loadInterface (pprModuleName mod <+> ptext SLIT("is a orphan-instance module")) mod ImportBySystem + +loadInterface :: SDoc -> ModuleName -> WhereFrom -> RnM d (Module, Ifaces) +loadInterface doc_str mod_name from + = getIfacesRn `thenRn` \ ifaces -> + let + mod_map = iImpModInfo ifaces + mod_info = lookupFM mod_map mod_name + below_me = case mod_info of + Nothing -> False + Just (_, _, is_boot, _) -> not is_boot + in + + -- Issue a warning for a redundant {- SOURCE -} import + -- It's redundant if the moduld is in the iImpModInfo at all, + -- because we arrange to read all the ordinary imports before + -- any of the {- SOURCE -} imports + warnCheckRn (not (below_me && case from of {ImportByUserSource -> True; other -> False})) + (warnRedundantSourceImport mod_name) `thenRn_` + + -- CHECK WHETHER WE HAVE IT ALREADY + case mod_info of { + Just (_, _, _, Just (load_mod, _)) + -> -- We're read it already so don't re-read it + returnRn (load_mod, ifaces) ; + + mod_map_result -> + + -- READ THE MODULE IN + findAndReadIface doc_str mod_name from below_me + `thenRn` \ (hi_boot_read, read_result) -> + case read_result of { + Nothing -> -- Not found, so add an empty export env to the Ifaces map + -- so that we don't look again + let + mod = mkVanillaModule mod_name + new_mod_map = addToFM mod_map mod_name (0, False, False, Just (mod, [])) + new_ifaces = ifaces { iImpModInfo = new_mod_map } + in + setIfacesRn new_ifaces `thenRn_` + failWithRn (mod, new_ifaces) (noIfaceErr mod hi_boot_read) ; + + -- Found and parsed! + Just (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) + + getModuleRn `thenRn` \ this_mod_nm -> + let + rd_decls = pi_decls iface + in + foldlRn (loadDecl mod) (iDecls ifaces) rd_decls `thenRn` \ new_decls -> + foldlRn (loadInstDecl mod) (iInsts ifaces) (pi_insts iface) `thenRn` \ new_insts -> + (if opt_IgnoreIfacePragmas + then returnRn emptyBag + else foldlRn (loadRule mod) (iRules ifaces) (pi_rules iface)) `thenRn` \ new_rules -> + (if opt_IgnoreIfacePragmas + then returnRn emptyNameEnv + else foldlRn (loadDeprec mod) (iDeprecs ifaces) (pi_deprecs iface)) `thenRn` \ new_deprecs -> + foldlRn (loadFixDecl mod_name) (iFixes ifaces) rd_decls `thenRn` \ new_fixities -> + mapRn (loadExport this_mod_nm) (pi_exports iface) `thenRn` \ avails_s -> + let + -- 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 mod_map (pi_usages iface) + other -> mod_map + + -- Now add info about this module + mod_map2 = addToFM mod_map1 mod_name mod_details + mod_details = (pi_mod iface, pi_orphan iface, hi_boot_read, Just (mod, concat avails_s)) + + new_ifaces = ifaces { iImpModInfo = mod_map2, + iDecls = new_decls, + iFixes = new_fixities, + iInsts = new_insts, + iRules = new_rules, + iDeprecs = new_deprecs } + in + setIfacesRn new_ifaces `thenRn_` + returnRn (mod, new_ifaces) + }} + +addModDeps :: Module -> ImportedModuleInfo + -> [ImportVersion a] -> ImportedModuleInfo +addModDeps mod mod_deps new_deps + = foldr add mod_deps new_deps + where + is_lib = isLibModule mod -- Don't record dependencies when importing a library module + add (imp_mod, version, has_orphans, is_boot, _) deps + | is_lib && not has_orphans = deps + | otherwise = addToFM_C combine deps imp_mod (version, has_orphans, is_boot, Nothing) + -- Record dependencies for modules that are + -- either are dependent via a non-library module + -- or contain orphan rules or instance decls + + combine old@(_, _, old_is_boot, cts) new + | maybeToBool cts || 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 + +loadExport :: ModuleName -> ExportItem -> RnM d [AvailInfo] +loadExport this_mod (mod, entities) + | mod == 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 + new_name mod occ = mkImportedGlobalName 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) + + +loadFixDecl :: ModuleName -> FixityEnv + -> (Version, RdrNameHsDecl) + -> RnM d FixityEnv +loadFixDecl mod_name fixity_env (version, FixD sig@(FixitySig rdr_name fixity loc)) + = -- Ignore the version; when the fixity changes the version of + -- its 'host' entity changes, so we don't need a separate version + -- number for fixities + mkImportedGlobalName mod_name (rdrNameOcc rdr_name) `thenRn` \ name -> + let + new_fixity_env = addToNameEnv fixity_env name (FixitySig name fixity loc) + in + returnRn new_fixity_env -********************************************************* -* * -\subsection{Reading interface files} -* * -********************************************************* + -- Ignore the other sorts of decl +loadFixDecl mod_name fixity_env other_decl = returnRn fixity_env -Return cached info about a Module's interface; otherwise, -read the interface (using our @ModuleToIfaceFilePath@ map -to decide where to look). +loadDecl :: Module + -> DeclsMap + -> (Version, RdrNameHsDecl) + -> RnM d DeclsMap -Note: we have two notions of interface - * the interface for a particular file name - * the (combined) interface for a particular module name +loadDecl mod decls_map (version, decl) + = getDeclBinders new_name decl `thenRn` \ maybe_avail -> + case maybe_avail of { + Nothing -> returnRn decls_map; -- No bindings + Just avail -> -The idea is that two source files may declare a module -with the same name with the declarations being merged. + getDeclSysBinders new_name decl `thenRn` \ sys_bndrs -> + let + 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, (version, full_avail, name==main_name, (mod, decl'))) + | name <- availNames full_avail] + add_decl decls_map (name, stuff) + = WARN( name `elemNameEnv` decls_map, ppr name ) + addToNameEnv decls_map name stuff + in + returnRn new_decls_map + } + where + -- newImportedBinder 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. + new_name rdr_name loc = newImportedBinder mod rdr_name -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. + {- + 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 + +loadInstDecl :: Module + -> Bag GatedDecl + -> RdrNameInstDecl + -> RnM d (Bag GatedDecl) +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 (moduleName mod) $ + mapRn mkImportedGlobalFromRdrName 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 (MonoFunTy _ ty) = removeFuns ty +removeFuns ty = ty + + +loadRule :: Module -> Bag GatedDecl + -> RdrNameRuleDecl -> RnM d (Bag GatedDecl) +-- "Gate" the rule simply by whether the rule variable is +-- needed. We can refine this later. +loadRule mod rules decl@(IfaceRuleDecl var body src_loc) + = setModuleRn (moduleName mod) $ + mkImportedGlobalFromRdrName var `thenRn` \ var_name -> + returnRn ((unitNameSet var_name, (mod, RuleD decl)) `consBag` rules) + +-- SUP: TEMPORARY HACK, ignoring module deprecations for now +loadDeprec :: Module -> DeprecationEnv -> RdrNameDeprecation -> RnM d DeprecationEnv +loadDeprec mod deprec_env (Deprecation (IEModuleContents _) txt) + = traceRn (text "module deprecation not yet implemented:" <+> ppr mod <> colon <+> ppr txt) `thenRn_` + returnRn deprec_env +loadDeprec mod deprec_env (Deprecation ie txt) + = setModuleRn (moduleName mod) $ + mapRn mkImportedGlobalFromRdrName (namesFromIE ie) `thenRn` \ names -> + traceRn (text "loaded deprecation(s) for" <+> hcat (punctuate comma (map ppr names)) <> colon <+> ppr txt) `thenRn_` + returnRn (extendNameEnv deprec_env (zip names (repeat txt))) + +namesFromIE :: IE a -> [a] +namesFromIE (IEVar n ) = [n] +namesFromIE (IEThingAbs n ) = [n] +namesFromIE (IEThingAll n ) = [n] +namesFromIE (IEThingWith n ns) = n:ns +namesFromIE (IEModuleContents _ ) = [] +\end{code} -ToDo: Check duplicate definitons are the same. -ToDo: Check/Merge duplicate pragmas. +%******************************************************** +%* * +\subsection{Loading usage information} +%* * +%******************************************************** \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') - 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) - 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)) +checkUpToDate :: ModuleName -> RnMG Bool -- True <=> no need to recompile +checkUpToDate mod_name + = getIfacesRn `thenRn` \ ifaces -> + findAndReadIface doc_str mod_name + ImportByUser + (error "checkUpToDate") `thenRn` \ (_, read_result) -> + + -- CHECK WHETHER WE HAVE IT ALREADY + case read_result of + Nothing -> -- Old interface file not found, so we'd better bail out + traceRn (sep [ptext SLIT("Didnt find old iface"), + pprModuleName mod_name]) `thenRn_` + returnRn False + + Just (_, iface) + -> -- Found it, so now check it + checkModUsage (pi_usages iface) 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 -> + -- Only look in current directory, with suffix .hi + doc_str = sep [ptext SLIT("need usage info from"), pprModuleName mod_name] + +checkModUsage [] = returnRn True -- Yes! Everything is up to date! + +checkModUsage ((mod_name, old_mod_vers, _, _, Specifically []) : rest) + -- If CurrentModule.hi contains + -- import Foo :: ; + -- then that simply records that Foo lies below CurrentModule in the + -- hierarchy, but CurrentModule doesn't depend in any way on Foo. + -- In this case we don't even want to open Foo's interface. + = traceRn (ptext SLIT("Nothing used from:") <+> ppr mod_name) `thenRn_` + checkModUsage rest -- This one's ok, so check the rest + +checkModUsage ((mod_name, old_mod_vers, _, _, whats_imported) : rest) + = loadInterface doc_str mod_name ImportBySystem `thenRn` \ (mod, ifaces) -> let - return_maybe_decl = return maybe_decl - return_failed msg = return (Failed msg) + maybe_mod_vers = case lookupFM (iImpModInfo ifaces) mod_name of + Just (version, _, _, Just (_, _)) -> Just version + other -> Nothing 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) + case maybe_mod_vers of { + Nothing -> -- If we can't find a version number for the old module then + -- bail out saying things aren't up to date + traceRn (sep [ptext SLIT("Can't find version number for module"), + pprModuleName mod_name]) + `thenRn_` returnRn False ; + + Just new_mod_vers -> + + -- If the module version hasn't changed, just move on + if new_mod_vers == old_mod_vers then + traceRn (sep [ptext SLIT("Module version unchanged:"), pprModuleName mod_name]) + `thenRn_` checkModUsage rest + else + traceRn (sep [ptext SLIT("Module version has changed:"), pprModuleName mod_name]) + `thenRn_` + -- Module version changed, so check entities inside + + -- If the usage info wants to say "I imported everything from this module" + -- it does so by making whats_imported equal to Everything + -- In that case, we must recompile + case whats_imported of { + Everything -> traceRn (ptext SLIT("...and I needed the whole module")) `thenRn_` + returnRn False; -- Bale out + + Specifically old_local_vers -> + + -- Non-empty usage list, so check item by item + checkEntityUsage mod_name (iDecls ifaces) old_local_vers `thenRn` \ up_to_date -> + if up_to_date then + traceRn (ptext SLIT("...but the bits I use haven't.")) `thenRn_` + checkModUsage rest -- This one's ok, so check the rest + else + returnRn False -- This one failed, so just bail out now + }} 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} + doc_str = sep [ptext SLIT("need version info for"), pprModuleName mod_name] -\begin{code} -readIface :: FilePath -> Module - -> IO (MaybeErr ParsedIface Error) -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 +checkEntityUsage mod decls [] + = returnRn True -- Yes! All up to date! + +checkEntityUsage mod decls ((occ_name,old_vers) : rest) + = mkImportedGlobalName mod occ_name `thenRn` \ name -> + case lookupNameEnv decls name of + + Nothing -> -- We used it before, but it ain't there now + traceRn (sep [ptext SLIT("No longer exported:"), ppr name]) + `thenRn_` returnRn False + + Just (new_vers,_,_,_) -- It's there, but is it up to date? + | new_vers == old_vers + -- Up to date, so check the rest + -> checkEntityUsage mod decls rest + + | otherwise + -- Out of date, so bale out + -> traceRn (sep [ptext SLIT("Out of date:"), ppr name]) `thenRn_` + returnRn False \end{code} +%********************************************************* +%* * +\subsection{Getting in a declaration} +%* * +%********************************************************* + \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))) $ - -} +importDecl :: Name -> RnMG (Maybe (Module, RdrNameHsDecl)) + -- Returns Nothing for + -- (a) wired in name + -- (b) local decl + -- (c) already slurped + +importDecl name + | isWiredInName name + = returnRn Nothing + | otherwise + = getSlurped `thenRn` \ already_slurped -> + if name `elemNameSet` already_slurped then + returnRn Nothing -- Already dealt with + else + if isLocallyDefined name then -- Don't bring in decls from + -- the renamed module's own interface file + addWarnRn (importDeclWarn name) `thenRn_` + returnRn Nothing + else + getNonWiredInDecl name +\end{code} - -- 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} +getNonWiredInDecl :: Name -> RnMG (Maybe (Module, RdrNameHsDecl)) +getNonWiredInDecl needed_name + = traceRn doc_str `thenRn_` + loadHomeInterface doc_str needed_name `thenRn` \ ifaces -> + case lookupNameEnv (iDecls ifaces) needed_name of + + Just (version,avail,_,decl) + -> recordSlurp (Just version) avail `thenRn_` + returnRn (Just decl) + + Nothing -- Can happen legitimately for "Optional" occurrences + -> addErrRn (getDeclErr needed_name) `thenRn_` + returnRn Nothing 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 + doc_str = ptext SLIT("need decl for") <+> ppr needed_name +\end{code} - 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) +@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. - | 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) - let - val_occs = val_defds ++ fmToList val_imps - tc_occs = tc_defds ++ fmToList tc_imps - in - case (extendGlobalRnEnv occ_env val_occs tc_occs) of { (new_occ_env, occ_dups) -> +\item similarly for synonum type constructor --- ASSERT(isEmptyBag occ_dups) --- False because we may get a dup on the name we just shoved in +\item if the wired-in name is another wired-in Id, it marks as ``occurrences'' + the free vars of the Id's type. - (new_def_env, new_occ_env, us) }} +\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. + ----------------- -type To_Return = (([RenamedTyDecl], [RenamedClassDecl], [RenamedInstDecl], [RenamedSig]), - ImplicitEnv, -- new names used implicitly - (Bag Error, Bag Warning) - ) -empty_return :: To_Return -empty_return = (([],[],[],[]), emptyImplicitEnv, (emptyBag,emptyBag)) + +%********************************************************* +%* * +\subsection{Getting what a module exports} +%* * +%********************************************************* -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) +@getInterfaceExports@ is called only for directly-imported modules. -add_insts is ((tydecls, classdecls, instdecls, sigs), implicit, msgs) - = ((tydecls, classdecls, is ++ instdecls, sigs), implicit, msgs) +\begin{code} +getInterfaceExports :: ModuleName -> WhereFrom -> RnMG (Module, Avails) +getInterfaceExports mod_name from + = loadInterface doc_str mod_name from `thenRn` \ (mod, ifaces) -> + case lookupFM (iImpModInfo ifaces) mod_name of + Nothing -> -- Not there; it must be that the interface file wasn't found; + -- the error will have been reported already. + -- (Actually loadInterface should put the empty export env in there + -- anyway, but this does no harm.) + returnRn (mod, []) + + Just (_, _, _, Just (mod, avails)) -> returnRn (mod, avails) + where + doc_str = sep [pprModuleName mod_name, ptext SLIT("is directly imported")] +\end{code} -add_implicits (val_imps, tc_imps) (decls, (val_fm, tc_fm), msgs) - = (decls, (val_fm `plusFM` val_imps, tc_fm `plusFM` tc_imps), msgs) -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)) -\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, _, Nothing)) <- 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 + + load_home gate | isLocallyDefined gate + = returnRn () + | otherwise + = loadHomeInterface (ppr gate <+> text "is an instance gate") gate `thenRn_` + returnRn () + +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 + (decls, new_rules) = selectGated gates (iRules ifaces) in - returnRn (AddedTy rn_decl, defds, implicits) + 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) + +lookupFixity :: Name -> RnMS Fixity +lookupFixity name + | isLocallyDefined name + = getFixityEnv `thenRn` \ local_fix_env -> + case lookupNameEnv local_fix_env name of + Just (FixitySig _ fix _) -> returnRn fix + Nothing -> returnRn defaultFixity + + | 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. + = loadHomeInterface doc name `thenRn` \ ifaces -> + case lookupNameEnv (iFixes ifaces) name of + Just (FixitySig _ fix _) -> returnRn fix + Nothing -> returnRn 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} +getImportVersions :: ModuleName -- Name of this module + -> ExportEnv -- Info about exports + -> RnMG (VersionInfo Name) -- Version info for these names -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 -> +getImportVersions this_mod (ExportEnv _ _ export_all_mods) + = getIfacesRn `thenRn` \ ifaces -> let - defds = (ops `zip` rn_ops, [(clas, rn_clas)]) - implicits = mentioned `sub` defds + mod_map = iImpModInfo ifaces + imp_names = iVSlurp ifaces + + -- mv_map groups together all the things imported from a particular module. + mv_map :: FiniteMap ModuleName [(Name,Version)] + mv_map = foldr add_mv emptyFM imp_names + + -- 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_version_info mod_name (version, has_orphans, is_boot, contents) 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 + + | otherwise + = let + go_for_it exports = (mod_name, version, has_orphans, is_boot, exports) + : so_far + in + case contents of + Nothing -> -- 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 dependeny info. + go_for_it (Specifically []) + + Just (mod, _) -- We did open the interface + | is_lib_module && not has_orphans + -> so_far + + | is_lib_module -- Record the module but not detailed + || mod_name `elem` export_all_mods -- version information for the imports + -> go_for_it Everything + + | otherwise + -> case lookupFM mv_map mod_name of + Just whats_imported -> go_for_it (Specifically whats_imported) + Nothing -> go_for_it (Specifically []) + -- This happens if you have + -- import Foo + -- but don't actually *use* anything from Foo + -- In which case record an empty dependency list + where + is_lib_module = isLibModule mod + 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 -> + + returnRn (foldFM mk_version_info [] mod_map) + where + add_mv v@(name, version) mv_map + = addToFM_C add_item mv_map mod [v] + where + mod = moduleName (nameModule name) + add_item vs _ = (v:vs) +\end{code} + +\begin{code} +getSlurped + = getIfacesRn `thenRn` \ ifaces -> + returnRn (iSlurp ifaces) + +recordSlurp maybe_version avail +-- Nothing for locally defined names +-- Just version for imported names + = getIfacesRn `thenRn` \ ifaces@(Ifaces { iSlurp = slurped_names, + iVSlurp = imp_names }) -> let - defds = ([(f, rn_f)], []) - implicits = mentioned `sub` defds + new_slurped_names = addAvailToNameSet slurped_names avail + + new_imp_names = case maybe_version of + Just version -> (availName avail, version) : imp_names + Nothing -> imp_names in - returnRn (AddedSig (Sig rn_f rn_ty noGenPragmas src_loc), defds, implicits) + setIfacesRn (ifaces { iSlurp = new_slurped_names, + iVSlurp = new_imp_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 -\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 + = lookupImplicitOccRn 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)) - } - where - get_insts (ParsedIface _ _ _ _ _ _ _ _ _ _ _ insts _) = insts +getDeclBinders new_name (DefD _) = returnRn Nothing +getDeclBinders new_name (InstD _) = returnRn Nothing +getDeclBinders new_name (RuleD _) = returnRn Nothing - add_done_inst (InstSig clas tycon _ _) inst_env - = addToFM_C (+) inst_env (tycon,clas) 1 +binds_haskell_name (FoImport _) _ = True +binds_haskell_name FoLabel _ = True +binds_haskell_name FoExport ext_nm = isDynamicExtName ext_nm - is_done_inst (InstSig clas tycon _ _) - = maybeToBool (lookupFM done_inst_env (tycon,clas)) +---------------- +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 + fields = concat (map fst fielddecls) - 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 +getConFieldNames new_name (ConDecl con _ _ _ condecl src_loc : rest) + = new_name con src_loc `thenRn` \ n -> + (case condecl of + NewCon _ (Just f) -> + new_name f src_loc `thenRn` \ new_f -> + returnRn [n,new_f] + _ -> returnRn [n]) `thenRn` \ nn -> + getConFieldNames new_name rest `thenRn` \ ns -> + returnRn (nn ++ ns) - 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 ... +getConFieldNames new_name [] = returnRn [] - 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] +getClassOpNames new_name (ClassOpSig op _ _ _ src_loc) = new_name op src_loc \end{code} -\begin{code} -rnIfaceInst :: RdrIfaceInst -> RnM_Fixes _RealWorld RenamedInstDecl +@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. -rnIfaceInst (InstSig _ _ _ inst_decl) = rnInstDecl inst_decl -\end{code} +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 _ _ tname dname dwname snames src_loc)) + = sequenceRn [new_name n src_loc | n <- (tname : dname : dwname : snames)] - (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 -> WhereFrom + -> Bool -- Only relevant for SystemImport + -- True <=> Look for a .hi file + -- False <=> Look for .hi-boot file unless there's + -- a library .hi file + -> RnM d (Bool, Maybe (Module, ParsedIface)) + -- Bool is True if the interface actually read was a .hi-boot one + -- Nothing <=> file not found, or unreadable, or illegible + -- Just x <=> successfully found and parsed + +findAndReadIface doc_str mod_name from hi_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. + + getHiMaps `thenRn` \ hi_maps -> + + case find_path from hi_maps of + -- Found the file + (hi_boot, Just (fpath, mod)) -> traceRn (ptext SLIT("...reading from") <+> text fpath) + `thenRn_` + readIface mod fpath `thenRn` \ result -> + returnRn (hi_boot, result) + (hi_boot, Nothing) -> traceRn (ptext SLIT("...not found")) `thenRn_` + returnRn (hi_boot, Nothing) + where + find_path ImportByUser (hi_map, _) = (False, lookupFM hi_map mod_name) + find_path ImportByUserSource (_, hiboot_map) = (True, lookupFM hiboot_map mod_name) -noIfaceErr mod sty - = ppCat [ppPStr SLIT("Could not find interface for:"), ppPStr mod] + find_path ImportBySystem (hi_map, hiboot_map) + | hi_file + = -- If the module we seek is in our dependent set, + -- Look for a .hi file + (False, lookupFM hi_map mod_name) -noOrigIfaceErr mod sty - = ppCat [ppPStr SLIT("Could not find original interface for:"), ppPStr mod] + | otherwise + -- Check if there's a library module of that name + -- If not, look for an hi-boot file + = case lookupFM hi_map mod_name of + stuff@(Just (_, mod)) | isLibModule mod -> (False, stuff) + other -> (True, lookupFM hiboot_map mod_name) + + trace_msg = sep [hsep [ptext SLIT("Reading"), + ppr from, + ptext SLIT("interface for"), + pprModuleName mod_name <> semi], + nest 4 (ptext SLIT("reason:") <+> doc_str)] +\end{code} -noDeclInIfaceErr mod str sty - = ppBesides [ppPStr SLIT("Could not find interface declaration of: "), - ppPStr mod, ppStr ".", ppPStr str] +@readIface@ tries just the one file. -cannaeReadErr file err sty - = ppBesides [ppPStr SLIT("Failed in reading file: "), ppStr file, ppStr "; error=", ppStr (show err)] +\begin{code} +readIface :: Module -> String -> RnM d (Maybe (Module, ParsedIface)) + -- Nothing <=> file not found, or unreadable, or illegible + -- Just x <=> successfully found and parsed +readIface the_mod file_path + = 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 mod_nm iface) -> + warnCheckRn (mod_nm == moduleName the_mod) + (hiModuleNameMismatchWarn the_mod mod_nm) `thenRn_` + returnRn (Just (the_mod, iface)) + + PFailed err -> failWithRn Nothing err + other -> failWithRn Nothing (ptext SLIT("Unrecognisable interface file")) + -- 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 err + | isDoesNotExistError err -> returnRn Nothing + | otherwise -> failWithRn Nothing (cannaeReadFile file_path err) +\end{code} -ifaceLookupWiredErr msg n sty - = ppBesides [ppPStr SLIT("Why am I looking up a wired-in "), ppStr msg, ppChar ':', ppr sty n] +%********************************************************* +%* * +\subsection{Errors} +%* * +%********************************************************* + +\begin{code} +noIfaceErr filename boot_file + = hsep [ptext SLIT("Could not find valid"), boot, + ptext SLIT("interface file"), quotes (pprModule filename)] + where + boot | boot_file = ptext SLIT("[boot]") + | otherwise = empty + +cannaeReadFile file err + = hcat [ptext SLIT("Failed in reading file: "), + text file, + ptext SLIT("; error="), + text (show err)] + +getDeclErr name + = ptext SLIT("Failed to find interface decl for") <+> quotes (ppr name) + +getDeclWarn name loc + = sep [ptext SLIT("Failed to find (optional) interface decl for") <+> quotes (ppr name), + ptext SLIT("desired at") <+> ppr loc] + +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 (pprModuleName mod_name) + +hiModuleNameMismatchWarn :: Module -> ModuleName -> Message +hiModuleNameMismatchWarn requested_mod mod_nm = + hsep [ ptext SLIT("Something is amiss; requested module name") + , pprModule requested_mod + , ptext SLIT("differs from name found in the interface file ") + , pprModuleName mod_nm + ] -badIfaceLookupErr msg name decl sty - = ppBesides [ppPStr SLIT("Expected a "), ppStr msg, ppPStr SLIT(" declaration, but got this: ???")] \end{code}