X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnIfaces.lhs;h=bc6b7bbd22d025cc03f34bbe8302c77b3789957e;hb=438596897ebbe25a07e1c82085cfbc5bdb00f09e;hp=649391dd4d29a5a80e3f96eed6acc1a7a4ceee4a;hpb=7a3bd641457666e10d0a47be9f22762e03defbf0;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnIfaces.lhs b/ghc/compiler/rename/RnIfaces.lhs index 649391d..bc6b7bb 100644 --- a/ghc/compiler/rename/RnIfaces.lhs +++ b/ghc/compiler/rename/RnIfaces.lhs @@ -1,17 +1,15 @@ % -% (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 ( getInterfaceExports, getImportedInstDecls, - getSpecialInstModules, - getDecl, getWiredInDecl, - getImportVersions, + getSpecialInstModules, getDeferredDataDecls, + importDecl, recordSlurp, + getImportVersions, getSlurpedNames, getRnStats, checkUpToDate, @@ -19,146 +17,286 @@ module RnIfaces ( mkSearchPath ) where -IMP_Ubiq() - +#include "HsVersions.h" -import HsSyn ( HsDecl(..), TyDecl(..), ClassDecl(..), HsTyVar, Bind, HsExpr, Sig(..), - HsBinds(..), MonoBinds, DefaultDecl, ConDecl(..), HsType, BangType, IfaceSig(..), - FixityDecl(..), Fixity, Fake, InPat, InstDecl(..), SYN_IE(Version), HsIdInfo +import CmdLineOpts ( opt_PruneTyDecls, opt_PruneInstDecls, + opt_D_show_rn_imports, opt_IgnoreIfacePragmas + ) +import HsSyn ( HsDecl(..), TyDecl(..), ClassDecl(..), InstDecl(..), IfaceSig(..), + HsType(..), ConDecl(..), IE(..), ConDetails(..), Sig(..), + hsDeclName ) -import HsPragmas ( noGenPragmas ) -import RdrHsSyn ( SYN_IE(RdrNameHsDecl), SYN_IE(RdrNameInstDecl), - RdrName, rdrNameOcc +import BasicTypes ( Version, NewOrData(..), IfaceFlavour(..) ) +import RdrHsSyn ( RdrNameHsDecl, RdrNameInstDecl, RdrNameTyDecl, + RdrName(..), rdrNameOcc ) -import RnEnv ( newGlobalName, lookupRn, addImplicitOccsRn, availNames ) -import RnSource ( rnHsType ) +import RnEnv ( newImportedGlobalName, addImplicitOccsRn, + ifaceFlavour, availName, availNames, addAvailToNameSet + ) +import RnSource ( rnHsSigType ) import RnMonad -import ParseIface ( parseIface ) - -import ErrUtils ( SYN_IE(Error), SYN_IE(Warning) ) -import FiniteMap ( FiniteMap, emptyFM, unitFM, lookupFM, addToFM, addListToFM, fmToList ) -import Name ( Name {-instance NamedThing-}, Provenance, OccName(..), - modAndOcc, occNameString, moduleString, pprModule, - NameSet(..), emptyNameSet, unionNameSets, nameSetToList, - minusNameSet, mkNameSet, - isWiredInName, maybeWiredInTyConName, maybeWiredInIdName +import RnHsSyn ( RenamedHsDecl ) +import ParseIface ( parseIface, IfaceStuff(..) ) + +import FiniteMap ( FiniteMap, sizeFM, emptyFM, delFromFM, + lookupFM, addToFM, addToFM_C, addListToFM, + fmToList + ) +import Name ( Name {-instance NamedThing-}, OccName(..), + nameModule, moduleString, pprModule, isLocallyDefined, + isWiredInName, maybeWiredInTyConName, + maybeWiredInIdName, nameUnique, NamedThing(..) ) -import Id ( GenId, Id(..), idType, dataConTyCon, isDataCon ) +import NameSet +import Id ( idType, isDataConId_maybe ) +import DataCon ( dataConTyCon, dataConType ) import TyCon ( TyCon, tyConDataCons, isSynTyCon, getSynTyConDefn ) import Type ( namesOfType ) -import TyVar ( GenTyVar ) -import SrcLoc ( mkIfaceSrcLoc ) -import PrelMods ( gHC__ ) +import Var ( Id ) +import SrcLoc ( mkSrcLoc, SrcLoc ) +import PrelMods ( pREL_GHC ) +import PrelInfo ( cCallishTyKeys, thinAirModules ) import Bag -import Maybes ( MaybeErr(..), expectJust, maybeToBool ) +import Maybes ( MaybeErr(..), maybeToBool ) import ListSetOps ( unionLists ) -import Pretty -import PprStyle ( PprStyle(..) ) -import Util ( pprPanic ) +import Outputable +import Unique ( Unique ) +import StringBuffer ( StringBuffer, hGetStringBuffer ) +import FastString ( mkFastString ) +import Outputable + +import IO ( isDoesNotExistError ) +import List ( nub ) + \end{code} %********************************************************* %* * -\subsection{Loading a new interface file} +\subsection{Statistics} %* * %********************************************************* \begin{code} -loadInterface :: Pretty -> Module -> RnMG Ifaces -loadInterface doc_str load_mod +getRnStats :: [RenamedHsDecl] -> RnMG SDoc +getRnStats all_decls = getIfacesRn `thenRn` \ ifaces -> let - Ifaces this_mod mod_vers_map export_env_map vers_map decls_map inst_map inst_mods = ifaces + Ifaces this_mod mod_map decls_fm all_names imp_names (unslurped_insts,_) deferred_data_decls inst_mods = ifaces + n_mods = sizeFM mod_map + + decls_imported = filter is_imported_decl all_decls + decls_read = [decl | (name, (_, avail, decl)) <- fmToList decls_fm, + name == availName avail, + -- Data, newtype, and class decls are in the decls_fm + -- under multiple names; the tycon/class, and each + -- constructor/class op too. + not (isLocallyDefined name) + ] + + (cd_rd, dd_rd, add_rd, nd_rd, and_rd, sd_rd, vd_rd, _) = count_decls decls_read + (cd_sp, dd_sp, add_sp, nd_sp, and_sp, sd_sp, vd_sp, id_sp) = count_decls decls_imported + + inst_decls_unslurped = length (bagToList unslurped_insts) + inst_decls_read = id_sp + inst_decls_unslurped + + stats = vcat + [int n_mods <> text " interfaces read", + hsep [int cd_sp, text "class decls imported, out of", + int cd_rd, text "read"], + hsep [int dd_sp, text "data decls imported (of which", int add_sp, text "abstractly), out of", + int dd_rd, text "read"], + hsep [int nd_sp, text "newtype decls imported (of which", int and_sp, text "abstractly), out of", + int nd_rd, text "read"], + hsep [int sd_sp, text "type synonym decls imported, out of", + int sd_rd, text "read"], + hsep [int vd_sp, text "value signatures imported, out of", + int vd_rd, text "read"], + hsep [int id_sp, text "instance decls imported, out of", + int inst_decls_read, text "read"] + ] in + returnRn (hcat [text "Renamer stats: ", stats]) + +is_imported_decl (DefD _) = False +is_imported_decl (ValD _) = False +is_imported_decl decl = not (isLocallyDefined (hsDeclName decl)) + +count_decls decls + = -- pprTrace "count_decls" (ppr decls + -- + -- $$ + -- text "=========" + -- $$ + -- ppr imported_decls + -- ) $ + (class_decls, + data_decls, abstract_data_decls, + newtype_decls, abstract_newtype_decls, + syn_decls, + val_decls, + inst_decls) + where + class_decls = length [() | ClD _ <- decls] + data_decls = length [() | TyD (TyData DataType _ _ _ _ _ _ _) <- decls] + newtype_decls = length [() | TyD (TyData NewType _ _ _ _ _ _ _) <- decls] + abstract_data_decls = length [() | TyD (TyData DataType _ _ _ [] _ _ _) <- decls] + abstract_newtype_decls = length [() | TyD (TyData NewType _ _ _ [] _ _ _) <- decls] + syn_decls = length [() | TyD (TySynonym _ _ _ _) <- decls] + val_decls = length [() | SigD _ <- decls] + inst_decls = length [() | InstD _ <- decls] + +\end{code} + +%********************************************************* +%* * +\subsection{Loading a new interface file} +%* * +%********************************************************* + +\begin{code} +loadInterface :: SDoc -> Module -> IfaceFlavour -> RnMG Ifaces +loadInterface doc_str load_mod as_source + = getIfacesRn `thenRn` \ ifaces -> + let + Ifaces this_mod mod_map decls + all_names imp_names (insts, tycls_names) + deferred_data_decls inst_mods = ifaces + in -- CHECK WHETHER WE HAVE IT ALREADY - if maybeToBool (lookupFM export_env_map load_mod) - then - returnRn ifaces -- Already in the cache; don't re-read it - else + case lookupFM mod_map load_mod of { + Just (hif, _, _, _) | hif `as_good_as` as_source + -> -- Already in the cache; don't re-read it + returnRn ifaces ; + other -> -- READ THE MODULE IN - findAndReadIface doc_str load_mod `thenRn` \ read_result -> - case read_result of { + findAndReadIface doc_str load_mod as_source `thenRn` \ read_result -> + case read_result of { -- Check for not found Nothing -> -- Not found, so add an empty export env to the Ifaces map -- so that we don't look again let - new_export_env_map = addToFM export_env_map load_mod ([],[]) - new_ifaces = Ifaces this_mod mod_vers_map - new_export_env_map - vers_map decls_map inst_map inst_mods + new_mod_map = addToFM mod_map load_mod (HiFile, 0, [],[]) + new_ifaces = Ifaces this_mod new_mod_map + decls all_names imp_names (insts, tycls_names) + deferred_data_decls inst_mods in setIfacesRn new_ifaces `thenRn_` failWithRn new_ifaces (noIfaceErr load_mod) ; -- Found and parsed! - Just (ParsedIface _ mod_vers usages exports rd_inst_mods fixs decls insts) -> + Just (ParsedIface _ mod_vers usages exports rd_inst_mods fixs rd_decls rd_insts) -> -- LOAD IT INTO Ifaces - mapRn loadExport exports `thenRn` \ avails -> - foldlRn (loadDecl load_mod) (decls_map,vers_map) decls `thenRn` \ (new_decls_map, new_vers_map) -> - foldlRn (loadInstDecl load_mod) inst_map insts `thenRn` \ new_insts_map -> + -- 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) + foldlRn (loadDecl load_mod as_source) decls rd_decls `thenRn` \ new_decls -> + mapRn loadExport exports `thenRn` \ avails_s -> + foldlRn (loadInstDecl load_mod) insts rd_insts `thenRn` \ new_insts -> let - export_env = (avails, fixs) + mod_details = (as_source, mod_vers, concat avails_s, fixs) -- Exclude this module from the "special-inst" modules new_inst_mods = inst_mods `unionLists` (filter (/= this_mod) rd_inst_mods) new_ifaces = Ifaces this_mod - (addToFM mod_vers_map load_mod mod_vers) - (addToFM export_env_map load_mod export_env) - new_vers_map - new_decls_map - new_insts_map + (addToFM mod_map load_mod mod_details) + new_decls + all_names imp_names + (new_insts, tycls_names) + deferred_data_decls new_inst_mods in setIfacesRn new_ifaces `thenRn_` returnRn new_ifaces - } - -loadExport :: ExportItem -> RnMG AvailInfo -loadExport (mod, occ, occs) - = new_name occ `thenRn` \ name -> - mapRn new_name occs `thenRn` \ names -> - returnRn (Avail name names) - where - new_name occ = newGlobalName mod occ + }} -loadVersion :: Module -> VersionMap -> (OccName,Version) -> RnMG VersionMap -loadVersion mod vers_map (occ, version) - = newGlobalName mod occ `thenRn` \ name -> - returnRn (addToFM vers_map name version) +as_good_as HiFile any = True +as_good_as any HiBootFile = True +as_good_as _ _ = False -loadDecl :: Module -> (DeclsMap, VersionMap) +loadExport :: ExportItem -> RnMG [AvailInfo] +loadExport (mod, hif, entities) + = mapRn load_entity entities + where + new_name occ = newImportedGlobalName mod occ hif + + load_entity (Avail occ) + = new_name occ `thenRn` \ name -> + returnRn (Avail name) + load_entity (AvailTC occ occs) + = new_name occ `thenRn` \ name -> + mapRn new_name occs `thenRn` \ names -> + returnRn (AvailTC name names) + +loadDecl :: Module + -> IfaceFlavour + -> DeclsMap -> (Version, RdrNameHsDecl) - -> RnMG (DeclsMap, VersionMap) -loadDecl mod (decls_map, vers_map) (version, decl) - = getDeclBinders new_implicit_name decl `thenRn` \ avail@(Avail name _) -> + -> RnMG DeclsMap +loadDecl mod as_source decls_map (version, decl) + = getDeclBinders new_implicit_name decl `thenRn` \ avail -> returnRn (addListToFM decls_map - [(name,(avail,decl)) | name <- availNames avail], - addToFM vers_map name version + [(name,(version,avail,decl')) | name <- availNames avail] ) where - new_implicit_name rdr_name loc = newGlobalName mod (rdrNameOcc rdr_name) - -loadInstDecl :: Module -> Bag IfaceInst -> RdrNameInstDecl -> RnMG (Bag IfaceInst) + {- + If a signature decl is being loaded and we're ignoring interface pragmas, + 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 + it's interface file. Hence, B is recompiled, maybe changing it's interface file, + which will the ufolding info used in A to become invalid. Simple way out is to + just ignore unfolding info. + -} + decl' = + case decl of + SigD (IfaceSig name tp ls loc) | from_hi_boot || opt_IgnoreIfacePragmas -> + SigD (IfaceSig name tp [] loc) + _ -> decl + + new_implicit_name rdr_name loc = newImportedGlobalName mod (rdrNameOcc rdr_name) as_source + + from_hi_boot = case as_source of + HiBootFile -> True + other -> False + +loadInstDecl :: Module + -> Bag IfaceInst + -> RdrNameInstDecl + -> RnMG (Bag IfaceInst) loadInstDecl mod_name insts decl@(InstDecl inst_ty binds uprags dfun_name src_loc) - = initRnMS emptyRnEnv mod_name InterfaceMode $ - - -- Find out what type constructors and classes are mentioned in the - -- instance declaration. We have to be a bit clever. + = + -- 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 ... -- - -- We want to rename the type so that we can find what - -- (free) type constructors are inside it. But we must *not* thereby - -- put new occurrences into the global pool because otherwise we'll force - -- them all to be loaded. We kill two birds with ones stone by renaming - -- with a fresh occurrence pool. - findOccurrencesRn (rnHsType inst_ty) `thenRn` \ ty_names -> - - returnRn ((ty_names, mod_name, decl) `consBag` insts) + -- Here the gates are Baz and T, but *not* Foo. + let + munged_inst_ty = case inst_ty of + HsForAllTy tvs cxt ty -> HsForAllTy tvs [] ty + other -> inst_ty + in + -- We find the gates by renaming the instance type with in a + -- and returning the occurrence pool. + initRnMS emptyRnEnv mod_name vanillaInterfaceMode ( + findOccurrencesRn (rnHsSigType (text "an instance decl") munged_inst_ty) + ) `thenRn` \ gate_names -> + returnRn (((mod_name, decl), gate_names) `consBag` insts) + +vanillaInterfaceMode = InterfaceMode Compulsory (\_ -> False) \end{code} @@ -171,10 +309,13 @@ loadInstDecl mod_name insts decl@(InstDecl inst_ty binds uprags dfun_name src_lo \begin{code} checkUpToDate :: Module -> RnMG Bool -- True <=> no need to recompile checkUpToDate mod_name - = findAndReadIface doc_str mod_name `thenRn` \ read_result -> + = findAndReadIface doc_str mod_name HiFile `thenRn` \ read_result -> + + -- CHECK WHETHER WE HAVE IT ALREADY case read_result of - Nothing -> -- Old interface file not found, so we'd better bale out - traceRn (ppSep [ppStr "Didnt find old iface", pprModule PprDebug mod_name]) `thenRn_` + Nothing -> -- Old interface file not found, so we'd better bail out + traceRn (sep [ptext SLIT("Didnt find old iface"), + pprModule mod_name]) `thenRn_` returnRn False Just (ParsedIface _ _ usages _ _ _ _ _) @@ -182,60 +323,74 @@ checkUpToDate mod_name checkModUsage usages where -- Only look in current directory, with suffix .hi - doc_str = ppSep [ppStr "Need usage info from", pprModule PprDebug mod_name] - + doc_str = sep [ptext SLIT("need usage info from"), pprModule mod_name] checkModUsage [] = returnRn True -- Yes! Everything is up to date! -checkModUsage ((mod, old_mod_vers, old_local_vers) : rest) - = loadInterface doc_str mod `thenRn` \ ifaces -> +checkModUsage ((mod, hif, old_mod_vers, whats_imported) : rest) + = loadInterface doc_str mod hif `thenRn` \ ifaces -> let - Ifaces _ mod_vers_map _ new_vers_map _ _ _ = ifaces - maybe_new_mod_vers = lookupFM mod_vers_map mod - Just new_mod_vers = maybe_new_mod_vers + Ifaces _ mod_map decls _ _ _ _ _ = ifaces + maybe_new_mod_vers = lookupFM mod_map mod + Just (_, new_mod_vers, _, _) = maybe_new_mod_vers in -- If we can't find a version number for the old module then - -- bale out saying things aren't up to date + -- bail out saying things aren't up to date if not (maybeToBool maybe_new_mod_vers) then + traceRn (sep [ptext SLIT("Can't find version number for module"), pprModule mod]) `thenRn_` returnRn False else -- If the module version hasn't changed, just move on if new_mod_vers == old_mod_vers then - traceRn (ppSep [ppStr "Module version unchanged:", pprModule PprDebug mod]) `thenRn_` + traceRn (sep [ptext SLIT("Module version unchanged:"), pprModule mod]) `thenRn_` checkModUsage rest else - traceRn (ppSep [ppStr "Module version has changed:", pprModule PprDebug mod]) `thenRn_` + traceRn (sep [ptext SLIT("Module version has changed:"), pprModule mod]) `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 -> - -- New module version, so check entities inside - checkEntityUsage mod new_vers_map old_local_vers `thenRn` \ up_to_date -> + -- Non-empty usage list, so check item by item + checkEntityUsage mod decls old_local_vers `thenRn` \ up_to_date -> if up_to_date then - traceRn (ppStr "...but the bits I use havn't.") `thenRn_` + 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 - doc_str = ppSep [ppStr "need version info for", pprModule PprDebug mod] + doc_str = sep [ptext SLIT("need version info for"), pprModule mod] -checkEntityUsage mod new_vers_map [] +checkEntityUsage mod decls [] = returnRn True -- Yes! All up to date! -checkEntityUsage mod new_vers_map ((occ_name,old_vers) : rest) - = newGlobalName mod occ_name `thenRn` \ name -> - case lookupFM new_vers_map name of +checkEntityUsage mod decls ((occ_name,old_vers) : rest) + = newImportedGlobalName mod occ_name HiFile `thenRn` \ name -> + case lookupFM decls name of Nothing -> -- We used it before, but it ain't there now - traceRn (ppSep [ppStr "...and this no longer exported:", ppr PprDebug name]) `thenRn_` + putDocRn (sep [ptext SLIT("No longer exported:"), ppr name]) `thenRn_` returnRn False - Just new_vers -> -- It's there, but is it up to date? - if new_vers == old_vers then - -- Up to date, so check the rest - checkEntityUsage mod new_vers_map rest - else - traceRn (ppSep [ppStr "...and this is out of date:", ppr PprDebug name]) `thenRn_` - returnRn False -- Out of date, so bale out + 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 + -> putDocRn (sep [ptext SLIT("Out of date:"), ppr name]) `thenRn_` + returnRn False \end{code} @@ -246,24 +401,68 @@ checkEntityUsage mod new_vers_map ((occ_name,old_vers) : rest) %********************************************************* \begin{code} -getDecl :: Name -> RnMG (AvailInfo, RdrNameHsDecl) -getDecl name - = traceRn doc_str `thenRn_` - loadInterface doc_str mod `thenRn` \ (Ifaces _ _ _ _ decls_map _ _) -> - case lookupFM decls_map name of - - Just avail_w_decl -> returnRn avail_w_decl +importDecl :: Occurrence -> RnSMode -> RnMG (Maybe RdrNameHsDecl) + -- Returns Nothing for a wired-in or already-slurped decl + +importDecl (name, loc) mode + = checkSlurped name `thenRn` \ already_slurped -> + if already_slurped then +-- traceRn (sep [text "Already slurped:", ppr name]) `thenRn_` + returnRn Nothing -- Already dealt with + else + if isWiredInName name then + getWiredInDecl name mode + else + getIfacesRn `thenRn` \ ifaces -> + let + Ifaces this_mod _ _ _ _ _ _ _ = ifaces + mod = nameModule name + in + if mod == this_mod then -- Don't bring in decls from + addWarnRn (importDeclWarn mod name loc) `thenRn_` +-- pprTrace "importDecl wierdness:" (ppr name) $ + returnRn Nothing -- the renamed module's own interface file + -- + else + getNonWiredInDecl name loc mode +\end{code} - Nothing -> -- Can happen legitimately for "Optional" occurrences - returnRn (NotAvailable, ValD EmptyBinds) +\begin{code} +getNonWiredInDecl :: Name -> SrcLoc -> RnSMode -> RnMG (Maybe RdrNameHsDecl) +getNonWiredInDecl needed_name loc mode + = traceRn doc_str `thenRn_` + loadInterface doc_str mod (ifaceFlavour needed_name) `thenRn` \ (Ifaces _ _ decls _ _ _ _ _) -> + case lookupFM decls needed_name of + + -- Special case for data/newtype type declarations + Just (version, avail, TyD ty_decl) | is_data_or_newtype ty_decl + -> getNonWiredDataDecl needed_name version avail ty_decl `thenRn` \ (avail', maybe_decl) -> + recordSlurp (Just version) necessity avail' `thenRn_` + returnRn maybe_decl + + Just (version,avail,decl) + -> recordSlurp (Just version) necessity avail `thenRn_` + returnRn (Just decl) + + Nothing -> -- Can happen legitimately for "Optional" occurrences + case necessity of { + Optional -> addWarnRn (getDeclWarn needed_name loc); + other -> addErrRn (getDeclErr needed_name loc) + } `thenRn_` + returnRn Nothing where - (mod,_) = modAndOcc name - doc_str = ppSep [ppStr "Need decl for", ppr PprDebug name] + necessity = modeToNecessity mode + doc_str = sep [ptext SLIT("need decl for"), ppr needed_name, ptext SLIT("needed at"), ppr loc] + mod = nameModule needed_name + + is_data_or_newtype (TyData _ _ _ _ _ _ _ _) = True + is_data_or_newtype other = False \end{code} @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, + * 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. @@ -280,139 +479,402 @@ 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. \begin{code} -getWiredInDecl :: Name -> RnMG AvailInfo -getWiredInDecl name - = -- Force in the home module in case it has instance decls for - -- the thing we are interested in - (if mod == gHC__ then - returnRn () -- Mini hack; GHC is guaranteed not to have - -- instance decls, so it's a waste of time - -- to read it +getWiredInDecl name mode + = initRnMS emptyRnEnv mod_name new_mode + get_wired `thenRn` \ avail -> + recordSlurp Nothing necessity avail `thenRn_` + + -- Force in the home module in case it has instance decls for + -- the thing we are interested in. + -- + -- Mini hack 1: no point for non-tycons/class; and if we + -- do this we find PrelNum trying to import PackedString, + -- because PrelBase's .hi file mentions PackedString.unpackString + -- But PackedString.hi isn't built by that point! + -- + -- Mini hack 2; GHC is guaranteed not to have + -- instance decls, so it's a waste of time to read it + -- + -- NB: We *must* look at the availName of the slurped avail, + -- not the name passed to getWiredInDecl! Why? Because if a data constructor + -- or class op is passed to getWiredInDecl we'll pull in the whole data/class + -- decl, and recordSlurp will record that fact. But since the data constructor + -- isn't a tycon/class we won't force in the home module. And even if the + -- type constructor/class comes along later, loadDecl will say that it's already + -- been slurped, so getWiredInDecl won't even be called. Pretty obscure bug, this was. + let + main_name = availName avail + main_is_tc = case avail of { AvailTC _ _ -> True; Avail _ -> False } + mod = nameModule main_name + doc_str = sep [ptext SLIT("need home module for wired in thing"), ppr name] + in + (if not main_is_tc || mod == pREL_GHC then + returnRn () else - loadInterface doc_str mod `thenRn_` + loadInterface doc_str mod (ifaceFlavour main_name) `thenRn_` returnRn () - ) `thenRn_` - - if (maybeToBool maybe_wired_in_tycon) then - get_wired_tycon the_tycon - else -- Must be a wired-in-Id - if (isDataCon the_id) then -- ... a wired-in data constructor - get_wired_tycon (dataConTyCon the_id) - else -- ... a wired-in non data-constructor - get_wired_id the_id + ) `thenRn_` + + returnRn Nothing -- No declaration to process further where - doc_str = ppSep [ppStr "Need home module for wired in thing", ppr PprDebug name] - (mod,_) = modAndOcc name + necessity = modeToNecessity mode + new_mode = case mode of + InterfaceMode _ _ -> mode + SourceMode -> vanillaInterfaceMode + + get_wired | is_tycon -- ... a type constructor + = get_wired_tycon the_tycon + + | maybeToBool maybe_data_con -- ... a wired-in data constructor + = get_wired_tycon (dataConTyCon data_con) + + | otherwise -- ... a wired-in non data-constructor + = get_wired_id the_id + + mod_name = nameModule name maybe_wired_in_tycon = maybeWiredInTyConName name + is_tycon = maybeToBool maybe_wired_in_tycon maybe_wired_in_id = maybeWiredInIdName name Just the_tycon = maybe_wired_in_tycon Just the_id = maybe_wired_in_id + maybe_data_con = isDataConId_maybe the_id + Just data_con = maybe_data_con + get_wired_id id - = addImplicitOccsRn (nameSetToList id_mentioned) `thenRn_` - returnRn (Avail (getName id) []) + = addImplicitOccsRn id_mentions `thenRn_` + returnRn (Avail (getName id)) where - id_mentioned = namesOfType (idType id) + id_mentions = nameSetToList (namesOfType ty) + ty = idType id get_wired_tycon tycon | isSynTyCon tycon = addImplicitOccsRn (nameSetToList mentioned) `thenRn_` - returnRn (Avail (getName tycon) []) + returnRn (AvailTC tc_name [tc_name]) where + tc_name = getName tycon (tyvars,ty) = getSynTyConDefn tycon - mentioned = namesOfType ty `minusNameSet` mkNameSet (map getName tyvars) + mentioned = namesOfType ty `minusNameSet` mkNameSet (map getName tyvars) get_wired_tycon tycon | otherwise -- data or newtype = addImplicitOccsRn (nameSetToList mentioned) `thenRn_` - returnRn (Avail (getName tycon) (map getName data_cons)) + returnRn (AvailTC tycon_name (tycon_name : map getName data_cons)) where - data_cons = tyConDataCons tycon - mentioned = foldr (unionNameSets . namesOfType . idType) emptyNameSet data_cons + tycon_name = getName tycon + data_cons = tyConDataCons tycon + mentioned = foldr (unionNameSets . namesOfType . dataConType) emptyNameSet data_cons \end{code} + %********************************************************* %* * -\subsection{Getting other stuff} +\subsection{Getting what a module exports} %* * %********************************************************* \begin{code} -getInterfaceExports :: Module -> RnMG (Avails, [(OccName,Fixity)]) -getInterfaceExports mod - = loadInterface doc_str mod `thenRn` \ (Ifaces _ _ export_envs _ _ _ _) -> - case lookupFM export_envs mod of +getInterfaceExports :: Module -> IfaceFlavour -> RnMG (Avails, [(OccName,Fixity)]) +getInterfaceExports mod as_source + = loadInterface doc_str mod as_source `thenRn` \ (Ifaces _ mod_map _ _ _ _ _ _) -> + case lookupFM mod_map mod 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 ([],[]) - Just stuff -> returnRn stuff + Just (_, _, avails, fixities) -> returnRn (avails, fixities) where - doc_str = ppSep [pprModule PprDebug mod, ppStr "is directly imported"] + doc_str = sep [pprModule mod, ptext SLIT("is directly imported")] +\end{code} -getImportedInstDecls :: RnMG [IfaceInst] +%********************************************************* +%* * +\subsection{Data type declarations are handled specially} +%* * +%********************************************************* + +Data type declarations get special treatment. If we import a data type decl +with all its constructors, we end up importing all the types mentioned in +the constructors' signatures, and hence {\em their} data type decls, and so on. +In effect, we get the transitive closure of data type decls. Worse, this drags +in tons on instance decls, and their unfoldings, and so on. + +If only the type constructor is mentioned, then all this is a waste of time. +If any of the data constructors are mentioned then we really have to +drag in the whole declaration. + +So when we import the type constructor for a @data@ or @newtype@ decl, we +put it in the "deferred data/newtype decl" pile in Ifaces. Right at the end +we slurp these decls, if they havn't already been dragged in by an occurrence +of a constructor. + +\begin{code} +getNonWiredDataDecl needed_name + version + avail@(AvailTC tycon_name _) + ty_decl@(TyData new_or_data context tycon tyvars condecls derivings pragmas src_loc) + | needed_name == tycon_name + && opt_PruneTyDecls + -- don't prune newtypes, as the code generator may + -- want to peer inside a newtype type constructor + -- (ClosureInfo.fun_result_ty is the culprit.) + && not (new_or_data == NewType) + && not (nameUnique needed_name `elem` cCallishTyKeys) + -- Hack! Don't prune these tycons whose constructors + -- the desugarer must be able to see when desugaring + -- a CCall. Ugh! + + = -- Need the type constructor; so put it in the deferred set for now + getIfacesRn `thenRn` \ ifaces -> + let + Ifaces this_mod mod_map decls_fm slurped_names imp_names + unslurped_insts deferred_data_decls inst_mods = ifaces + + new_ifaces = Ifaces this_mod mod_map decls_fm slurped_names imp_names + unslurped_insts new_deferred_data_decls inst_mods + + no_constr_ty_decl = TyData new_or_data [] tycon tyvars [] derivings pragmas src_loc + new_deferred_data_decls = addToFM deferred_data_decls tycon_name no_constr_ty_decl + -- Nota bene: we nuke both the constructors and the context in the deferred decl. + -- If we don't nuke the context then renaming the deferred data decls can give + -- new unresolved names (for the classes). This could be handled, but there's + -- no point. If the data type is completely abstract then we aren't interested + -- its context. + in + setIfacesRn new_ifaces `thenRn_` + returnRn (AvailTC tycon_name [tycon_name], Nothing) + + | otherwise + = -- Need a data constructor, so delete the data decl from the deferred set if it's there + getIfacesRn `thenRn` \ ifaces -> + let + Ifaces this_mod mod_map decls_fm slurped_names imp_names + unslurped_insts deferred_data_decls inst_mods = ifaces + + new_ifaces = Ifaces this_mod mod_map decls_fm slurped_names imp_names + unslurped_insts new_deferred_data_decls inst_mods + + new_deferred_data_decls = delFromFM deferred_data_decls tycon_name + in + setIfacesRn new_ifaces `thenRn_` + returnRn (avail, Just (TyD ty_decl)) +\end{code} + +\begin{code} +getDeferredDataDecls :: RnMG [(Name, RdrNameTyDecl)] +getDeferredDataDecls + = getIfacesRn `thenRn` \ (Ifaces _ _ _ _ _ _ deferred_data_decls _) -> + let + deferred_list = fmToList deferred_data_decls + trace_msg = hang (text "Slurping abstract data/newtype decls for: ") + 4 (ppr (map fst deferred_list)) + in + traceRn trace_msg `thenRn_` + returnRn deferred_list +\end{code} + + +%********************************************************* +%* * +\subsection{Instance declarations are handled specially} +%* * +%********************************************************* + +\begin{code} +getImportedInstDecls :: RnMG [(Module,RdrNameInstDecl)] getImportedInstDecls = -- First load any special-instance modules that aren't aready loaded getSpecialInstModules `thenRn` \ inst_mods -> mapRn load_it inst_mods `thenRn_` -- Now we're ready to grab the instance declarations - getIfacesRn `thenRn` \ ifaces -> + -- Find the un-gated ones and return them, + -- removing them from the bag kept in Ifaces + getIfacesRn `thenRn` \ ifaces -> let - Ifaces _ _ _ _ _ insts _ = ifaces + Ifaces this_mod mod_map decls slurped_names imp_names (insts, tycls_names) deferred_data_decls inst_mods = ifaces + + -- An instance decl is ungated if all its gates have been slurped + select_ungated :: IfaceInst -- A gated inst decl + + -> ([(Module, RdrNameInstDecl)], [IfaceInst]) -- Accumulator + + -> ([(Module, RdrNameInstDecl)], -- The ungated ones + [IfaceInst]) -- Still gated, but with + -- depeleted gates + select_ungated (decl,gates) (ungated_decls, gated_decls) + | null remaining_gates + = (decl : ungated_decls, gated_decls) + | otherwise + = (ungated_decls, (decl, remaining_gates) : gated_decls) + where + remaining_gates = filter (not . (`elemNameSet` tycls_names)) gates + + (un_gated_insts, still_gated_insts) = foldrBag select_ungated ([], []) insts + + new_ifaces = Ifaces this_mod mod_map decls slurped_names imp_names + ((listToBag still_gated_insts), tycls_names) + -- NB: don't throw away tycls_names; we may comre across more instance decls + deferred_data_decls + inst_mods in - returnRn (bagToList insts) + traceRn (sep [text "getInstDecls:", fsep (map ppr (nameSetToList tycls_names))]) `thenRn_` + setIfacesRn new_ifaces `thenRn_` + returnRn un_gated_insts where - load_it mod = loadInterface (doc_str mod) mod - doc_str mod = ppSep [pprModule PprDebug mod, ppStr "is a special-instance module"] + load_it mod = loadInterface (doc_str mod) mod HiFile + doc_str mod = sep [pprModule mod, ptext SLIT("is a special-instance module")] + getSpecialInstModules :: RnMG [Module] getSpecialInstModules = getIfacesRn `thenRn` \ ifaces -> let - Ifaces _ _ _ _ _ _ inst_mods = ifaces + Ifaces _ _ _ _ _ _ _ inst_mods = ifaces in returnRn inst_mods \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: + - anything reachable from its body code + - any module exported with a "module Foo". + +Why the latter? 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. + +What about this? + module A( f, g ) where module B( f ) where + import B( f ) f = h 3 + g = ... h = ... + +Should we record B.f in A's usages? In fact we don't. Certainly, if +anything about B.f changes than anyone who imports A should be recompiled; +they'll get an early exit if they don't use B.f. However, 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. So there are two things going on when compiling module A: + +1. Are A.o and A.hi correct? Then we can bale out early. +2. Should modules that import A be recompiled? + +For (1) it is slightly harmful to record B.f in A's usages, because a change in +B.f's version will provoke full recompilation of A, producing an identical A.o, +and A.hi differing only in its usage-version of B.f (which isn't used by any importer). + +For (2), because of the tricky B.h question above, we ensure that A.hi is touched +(even if identical to its previous version) if A's recompilation was triggered by +an imported .hi file date change. Given that, there's no need to record B.f in +A's usages. + +On the other hand, if A exports "module B" then we *do* count module B among +A's usages, because we must recompile A to ensure that A.hi changes appropriately. + \begin{code} -getImportVersions :: [AvailInfo] -- Imported avails +getImportVersions :: Module -- Name of this module + -> Maybe [IE any] -- Export list for this module -> RnMG (VersionInfo Name) -- Version info for these names -getImportVersions imported_avails +getImportVersions this_mod exports = getIfacesRn `thenRn` \ ifaces -> let - Ifaces _ mod_versions_map _ version_map _ _ _ = ifaces - - -- import_versions is harder: we have to group together all the things imported - -- from a particular module. We do this with yet another finite map - - mv_map :: FiniteMap Module [LocalVersion Name] - mv_map = foldl add_mv emptyFM imported_avails - add_mv mv_map (Avail name _) - | isWiredInName name = mv_map -- Don't record versions for wired-in names - | otherwise = case lookupFM mv_map mod of - Just versions -> addToFM mv_map mod ((name,version):versions) - Nothing -> addToFM mv_map mod [(name,version)] - where - (mod,_) = modAndOcc name - version = case lookupFM version_map name of - Just v -> v - Nothing -> pprPanic "getVersionInfo:" (ppr PprDebug name) - - import_versions = [ (mod, expectJust "import_versions" (lookupFM mod_versions_map mod), local_versions) - | (mod, local_versions) <- fmToList mv_map - ] - - -- Question: should we filter the builtins out of import_versions? + Ifaces _ mod_map _ _ imp_names _ _ _ = ifaces + + -- mv_map groups together all the things imported from a particular module. + mv_map, mv_map_mod :: FiniteMap Module (WhatsImported Name) + + mv_map_mod = foldl add_mod emptyFM export_mods + -- mv_map_mod records all the modules that have a "module M" + -- in this module's export list with an "Everything" + + mv_map = foldl add_mv mv_map_mod imp_names + -- mv_map adds the version numbers of things exported individually + + mk_version_info (mod, local_versions) + = case lookupFM mod_map mod of + Just (hif, version, _, _) -> (mod, hif, version, local_versions) in - returnRn import_versions + returnRn (map mk_version_info (fmToList mv_map)) + where + export_mods = case exports of + Nothing -> [] + Just es -> [mod | IEModuleContents mod <- es, mod /= this_mod] + + add_mv mv_map v@(name, version) + = addToFM_C add_item mv_map mod (Specifically [v]) + where + mod = nameModule name + + add_item Everything _ = Everything + add_item (Specifically xs) _ = Specifically (v:xs) + + add_mod mv_map mod = addToFM mv_map mod Everything \end{code} +\begin{code} +checkSlurped name + = getIfacesRn `thenRn` \ (Ifaces _ _ _ slurped_names _ _ _ _) -> + returnRn (name `elemNameSet` slurped_names) + +getSlurpedNames :: RnMG NameSet +getSlurpedNames + = getIfacesRn `thenRn` \ ifaces -> + let + Ifaces _ _ _ slurped_names _ _ _ _ = ifaces + in + returnRn slurped_names + +recordSlurp maybe_version necessity avail + = {- traceRn (hsep [text "Record slurp:", pprAvail avail, + -- NB PprForDebug prints export flag, which is too + -- strict; it's a knot-tied thing in RnNames + case necessity of {Compulsory -> text "comp"; Optional -> text "opt" } ]) `thenRn_` + -} + getIfacesRn `thenRn` \ ifaces -> + let + Ifaces this_mod mod_map decls slurped_names imp_names + (insts, tycls_names) deferred_data_decls inst_mods = ifaces + + new_slurped_names = addAvailToNameSet slurped_names avail + + new_imp_names = case maybe_version of + Just version -> (availName avail, version) : imp_names + Nothing -> imp_names + + -- Add to the names that will let in instance declarations; + -- but only (a) if it's a type/class + -- (b) if it's compulsory (unless the test flag opt_PruneInstDecls is off) + new_tycls_names = case avail of + AvailTC tc _ | not opt_PruneInstDecls || + case necessity of {Optional -> False; Compulsory -> True } + -> tycls_names `addOneToNameSet` tc + otherwise -> tycls_names + + new_ifaces = Ifaces this_mod mod_map decls + new_slurped_names + new_imp_names + (insts, new_tycls_names) + deferred_data_decls + inst_mods + in + setIfacesRn new_ifaces +\end{code} + + %********************************************************* %* * \subsection{Getting binders out of a declaration} @@ -427,59 +889,52 @@ It doesn't deal with source-code specific things: ValD, DefD. They are handled by the sourc-code specific stuff in RnNames. \begin{code} -getDeclBinders :: (RdrName -> SrcLoc -> RnMG Name) -- New-name function +getDeclBinders :: (RdrName -> SrcLoc -> RnMG Name) -- New-name function -> RdrNameHsDecl -> RnMG AvailInfo -getDeclBinders new_name (TyD (TyData _ tycon _ condecls _ _ src_loc)) +getDeclBinders new_name (TyD (TyData _ _ tycon _ condecls _ _ src_loc)) = new_name tycon src_loc `thenRn` \ tycon_name -> getConFieldNames new_name condecls `thenRn` \ sub_names -> - returnRn (Avail tycon_name sub_names) - -getDeclBinders new_name (TyD (TyNew _ tycon _ (NewConDecl con _ con_loc) _ _ src_loc)) - = new_name tycon src_loc `thenRn` \ tycon_name -> - new_name con src_loc `thenRn` \ con_name -> - returnRn (Avail tycon_name [con_name]) + returnRn (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 getDeclBinders new_name (TyD (TySynonym tycon _ _ src_loc)) = new_name tycon src_loc `thenRn` \ tycon_name -> - returnRn (Avail tycon_name []) + returnRn (AvailTC tycon_name [tycon_name]) -getDeclBinders new_name (ClD (ClassDecl _ cname _ sigs _ _ src_loc)) +getDeclBinders new_name (ClD (ClassDecl _ cname _ sigs _ _ tname dname src_loc)) = new_name cname src_loc `thenRn` \ class_name -> + new_name dname src_loc `thenRn` \ datacon_name -> + new_name tname src_loc `thenRn` \ tycon_name -> + + -- Record the names for the class ops mapRn (getClassOpNames new_name) sigs `thenRn` \ sub_names -> - returnRn (Avail class_name sub_names) + + returnRn (AvailTC class_name (class_name : datacon_name : tycon_name : sub_names)) getDeclBinders new_name (SigD (IfaceSig var ty prags src_loc)) = new_name var src_loc `thenRn` \ var_name -> - returnRn (Avail var_name []) + returnRn (Avail var_name) +getDeclBinders new_name (ForD _) = returnRn NotAvailable getDeclBinders new_name (DefD _) = returnRn NotAvailable getDeclBinders new_name (InstD _) = returnRn NotAvailable ---------------- -getConFieldNames new_name (ConDecl con _ src_loc : rest) - = new_name con src_loc `thenRn` \ n -> - getConFieldNames new_name rest `thenRn` \ ns -> - returnRn (n:ns) - -getConFieldNames new_name (NewConDecl con _ src_loc : rest) - = new_name con src_loc `thenRn` \ n -> - getConFieldNames new_name rest `thenRn` \ ns -> - returnRn (n:ns) - -getConFieldNames new_name (ConOpDecl _ con _ src_loc : rest) - = new_name con src_loc `thenRn` \ n -> - getConFieldNames new_name rest `thenRn` \ ns -> - returnRn (n:ns) - -getConFieldNames new_name (RecConDecl con fielddecls src_loc : rest) +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) +getConFieldNames new_name (ConDecl con _ _ _ src_loc : rest) + = new_name con src_loc `thenRn` \ n -> + getConFieldNames new_name rest `thenRn` \ ns -> + returnRn (n:ns) + getConFieldNames new_name [] = returnRn [] getClassOpNames new_name (ClassOpSig op _ _ src_loc) = new_name op src_loc @@ -493,79 +948,127 @@ getClassOpNames new_name (ClassOpSig op _ _ src_loc) = new_name op src_loc %********************************************************* \begin{code} -findAndReadIface :: Pretty -> Module -> RnMG (Maybe ParsedIface) +findAndReadIface :: SDoc -> Module + -> IfaceFlavour + -> RnMG (Maybe ParsedIface) -- Nothing <=> file not found, or unreadable, or illegible -- Just x <=> successfully found and parsed -findAndReadIface doc_str mod +findAndReadIface doc_str mod_name as_source = traceRn trace_msg `thenRn_` - getSearchPathRn `thenRn` \ dirs -> - try dirs dirs + -- 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. + getModuleHiMap as_source `thenRn` \ himap -> + case (lookupFM himap (moduleString mod_name)) of + -- Found the file + Just fpath -> readIface fpath + -- Hack alert! When compiling PrelBase we have to load the + -- decls for packCString# and friends; they are 'thin-air' Ids + -- (see PrelInfo.lhs). So if we don't find the HiFile we quietly + -- look for a .hi-boot file instead, and use that + Nothing | thinAirLoop mod_name as_source + -> findAndReadIface doc_str mod_name HiBootFile + | otherwise + -> traceRn (ptext SLIT("...failed")) `thenRn_` + returnRn Nothing where - trace_msg = ppHang (ppBesides [ppStr "Reading interface for ", - pprModule PprDebug mod, ppSemi]) - 4 (ppBesides [ppStr "reason: ", doc_str]) - - try all_dirs [] = traceRn (ppStr "...failed") `thenRn_` - returnRn Nothing - - try all_dirs (dir:dirs) - = readIface file_path `thenRn` \ read_result -> - case read_result of - Nothing -> try all_dirs dirs - Just iface -> traceRn (ppStr "...done") `thenRn_` - returnRn (Just iface) - where - file_path = dir ++ "/" ++ moduleString mod ++ ".hi" + thinAirLoop mod_name HiFile = mod_name `elem` thinAirModules + thinAirLoop mod_name hif = False + + trace_msg = sep [hsep [ptext SLIT("Reading"), + case as_source of { HiBootFile -> ptext SLIT("[boot]"); other -> empty}, + ptext SLIT("interface for"), + ptext mod_name <> semi], + nest 4 (ptext SLIT("reason:") <+> doc_str)] \end{code} -@readIface@ trys just one file. +@readIface@ tries just the one file. \begin{code} readIface :: String -> RnMG (Maybe ParsedIface) -- Nothing <=> file not found, or unreadable, or illegible -- Just x <=> successfully found and parsed readIface file_path - = ioToRnMG (readFile file_path) `thenRn` \ read_result -> + = ioToRnMG (hGetStringBuffer file_path) `thenRn` \ read_result -> case read_result of - Right contents -> case parseIface contents of - Failed err -> failWithRn Nothing err - Succeeded iface -> returnRn (Just iface) - - Left (NoSuchThing _) -> returnRn Nothing - - Left err -> failWithRn Nothing - (cannaeReadFile file_path err) - + Right contents -> + case parseIface contents (mkSrcLoc (mkFastString file_path) 1) of + Failed err -> failWithRn Nothing err + Succeeded (PIface iface) -> + if opt_D_show_rn_imports then + putDocRn (hcat[ptext SLIT("Read "), text file_path]) `thenRn_` + returnRn (Just iface) + else + returnRn (Just iface) + + Left err -> + if isDoesNotExistError err then + returnRn Nothing + else + failWithRn Nothing (cannaeReadFile file_path err) \end{code} -mkSearchPath takes a string consisting of a colon-separated list of directories, and turns it into -a list of directories. For example: +%********************************************************* +%* * +\subsection{Utils} +%* * +%********************************************************* - mkSearchPath "foo:.:baz" = ["foo", ".", "baz"] +@mkSearchPath@ takes a string consisting of a colon-separated list +of directories and corresponding suffixes, and turns it into a list +of (directory, suffix) pairs. For example: + +\begin{verbatim} + mkSearchPath "foo%.hi:.%.p_hi:baz%.mc_hi" + = [("foo",".hi"),( ".", ".p_hi"), ("baz",".mc_hi")] +\begin{verbatim} \begin{code} mkSearchPath :: Maybe String -> SearchPath -mkSearchPath Nothing = ["."] +mkSearchPath Nothing = [(".",".hi")] mkSearchPath (Just s) = go s where go "" = [] - go s = first : go (drop 1 rest) - where - (first,rest) = span (/= ':') s + go s = + case span (/= '%') s of + (dir,'%':rs) -> + case span (/= ':') rs of + (hisuf,_:rest) -> (dir,hisuf):go rest + (hisuf,[]) -> [(dir,hisuf)] \end{code} %********************************************************* -%* * +%* * \subsection{Errors} -%* * +%* * %********************************************************* \begin{code} -noIfaceErr mod sty - = ppBesides [ppStr "Could not find interface for ", ppQuote (pprModule sty mod)] --- , ppStr " in"]) 4 (ppAboves (map ppStr dirs)) +noIfaceErr filename + = hcat [ptext SLIT("Could not find valid interface file "), + quotes (pprModule filename)] + +cannaeReadFile file err + = hcat [ptext SLIT("Failed in reading file: "), + text file, + ptext SLIT("; error="), + text (show err)] + +getDeclErr name loc + = sep [ptext SLIT("Failed to find interface decl for"), + quotes (ppr name), ptext SLIT("needed at"), ppr loc] + +getDeclWarn name loc + = sep [ptext SLIT("Failed to find (optional) interface decl for"), + quotes (ppr name), ptext SLIT("desired at"), ppr loc] + +importDeclWarn mod name loc + = 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("Interface:"), quotes (pprModule mod), comma, ptext SLIT("name:"), quotes (ppr name), + comma, ptext SLIT("desired at:"), ppr loc + ] -cannaeReadFile file err sty - = ppBesides [ppPStr SLIT("Failed in reading file: "), ppStr file, ppStr "; error=", ppStr (show err)] \end{code}