#include "HsVersions.h"
module RnIfaces (
- findHiFiles,
- cacheInterface,
- readInterface,
- rnInterfaces,
- finalIfaceInfo,
- IfaceCache(..),
- VersionInfo(..),
- ParsedIface(..)
- ) where
+ getInterfaceExports,
+ getImportedInstDecls,
+ getSpecialInstModules,
+ getDecl, getWiredInDecl,
+ getImportVersions,
+
+ checkUpToDate,
-import PreludeGlaST ( returnPrimIO, thenPrimIO,
- readVar, writeVar, MutableVar(..) )
+ getDeclBinders,
+ mkSearchPath
+ ) where
-import Ubiq
+IMP_Ubiq()
-import HsSyn
-import RdrHsSyn
-import RnHsSyn
+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 HsPragmas ( noGenPragmas )
+import RdrHsSyn ( SYN_IE(RdrNameHsDecl), SYN_IE(RdrNameInstDecl),
+ RdrName, rdrNameOcc
+ )
+import RnEnv ( newGlobalName, lookupRn, addImplicitOccsRn, availNames )
+import RnSource ( rnHsType )
import RnMonad
-import RnUtils ( RnEnv(..) )
+import ParseIface ( parseIface )
-import Bag ( emptyBag )
-import ErrUtils ( Error(..), Warning(..) )
-import FiniteMap ( emptyFM, lookupFM, addToFM )
+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 Id ( GenId, Id(..), idType, dataConTyCon, isDataCon )
+import TyCon ( TyCon, tyConDataCons, isSynTyCon, getSynTyConDefn )
+import Type ( namesOfType )
+import TyVar ( GenTyVar )
+import SrcLoc ( mkIfaceSrcLoc )
+import PrelMods ( gHC__ )
+import Bag
+import Maybes ( MaybeErr(..), expectJust, maybeToBool )
+import ListSetOps ( unionLists )
import Pretty
-import Maybes ( MaybeErr(..) )
-import Util ( panic )
+import PprStyle ( PprStyle(..) )
+import Util ( pprPanic )
+\end{code}
+
+
+
+%*********************************************************
+%* *
+\subsection{Loading a new interface file}
+%* *
+%*********************************************************
+
+\begin{code}
+loadInterface :: Pretty -> Module -> RnMG Ifaces
+loadInterface doc_str load_mod
+ = getIfacesRn `thenRn` \ ifaces ->
+ let
+ Ifaces this_mod mod_vers_map export_env_map vers_map decls_map inst_map 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
+
+ -- READ THE MODULE IN
+ findAndReadIface doc_str load_mod `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
+ 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) ->
+
+ -- LOAD IT INTO Ifaces
+ mapRn loadExport exports `thenRn` \ avails_s ->
+ 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 ->
+ let
+ export_env = (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
+ new_inst_mods
+ in
+ setIfacesRn new_ifaces `thenRn_`
+ returnRn new_ifaces
+ }
+
+loadExport :: ExportItem -> RnMG [AvailInfo]
+loadExport (mod, entities)
+ = mapRn load_entity entities
+ where
+ new_name occ = newGlobalName mod occ
+
+ load_entity (occ, occs)
+ = new_name occ `thenRn` \ name ->
+ mapRn new_name occs `thenRn` \ names ->
+ returnRn (Avail name names)
+
+loadVersion :: Module -> VersionMap -> (OccName,Version) -> RnMG VersionMap
+loadVersion mod vers_map (occ, version)
+ = newGlobalName mod occ `thenRn` \ name ->
+ returnRn (addToFM vers_map name version)
+
+
+loadDecl :: Module -> (DeclsMap, VersionMap)
+ -> (Version, RdrNameHsDecl)
+ -> RnMG (DeclsMap, VersionMap)
+loadDecl mod (decls_map, vers_map) (version, decl)
+ = getDeclBinders new_implicit_name decl `thenRn` \ avail@(Avail name _) ->
+ returnRn (addListToFM decls_map
+ [(name,(avail,decl)) | name <- availNames avail],
+ addToFM vers_map name version
+ )
+ where
+ new_implicit_name rdr_name loc = newGlobalName mod (rdrNameOcc rdr_name)
+
+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.
+ --
+ -- 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)
+\end{code}
+
+
+%********************************************************
+%* *
+\subsection{Loading usage information}
+%* *
+%********************************************************
+
+\begin{code}
+checkUpToDate :: Module -> RnMG Bool -- True <=> no need to recompile
+checkUpToDate mod_name
+ = findAndReadIface doc_str mod_name `thenRn` \ read_result ->
+ 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_`
+ returnRn False
+
+ Just (ParsedIface _ _ usages _ _ _ _ _)
+ -> -- Found it, so now check it
+ checkModUsage usages
+ where
+ -- Only look in current directory, with suffix .hi
+ doc_str = ppSep [ppStr "Need usage info from", pprModule PprDebug 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 ->
+ 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
+ in
+ -- If we can't find a version number for the old module then
+ -- bale out saying things aren't up to date
+ if not (maybeToBool maybe_new_mod_vers) then
+ 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_`
+ checkModUsage rest
+ else
+ traceRn (ppSep [ppStr "Module version has changed:", pprModule PprDebug mod]) `thenRn_`
+
+ -- New module version, so check entities inside
+ checkEntityUsage mod new_vers_map old_local_vers `thenRn` \ up_to_date ->
+ if up_to_date then
+ traceRn (ppStr "...but the bits I use havn'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]
+
+
+checkEntityUsage mod new_vers_map []
+ = 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
+
+ Nothing -> -- We used it before, but it ain't there now
+ traceRn (ppSep [ppStr "...and this no longer exported:", ppr PprDebug 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
+\end{code}
+
+
+%*********************************************************
+%* *
+\subsection{Getting in a declaration}
+%* *
+%*********************************************************
+
+\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
+ Nothing -> -- Can happen legitimately for "Optional" occurrences
+ returnRn (NotAvailable, ValD EmptyBinds)
+ where
+ (mod,_) = modAndOcc name
+ doc_str = ppSep [ppStr "Need decl for", ppr PprDebug name]
\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.
+ * similarly for synonum type constructor
+
+ * if the wired-in name is another wired-in Id, it marks as "occurrences"
+ the free vars of the Id's type.
+
+ * it loads the interface file for the wired-in thing for the
+ sole purpose of making sure that its instance declarations are available
+
+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}
-type IfaceCache = MutableVar _RealWorld (FiniteMap Module ParsedIface,
- FiniteMap Module String)
+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 not is_tycon || mod == gHC__ then
+ returnRn () -- Mini hack 1: no point for non-tycons; 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
+ else
+ loadInterface doc_str mod `thenRn_`
+ returnRn ()
+ ) `thenRn_`
+
+ if is_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
+ where
+ doc_str = ppSep [ppStr "Need home module for wired in thing", ppr PprDebug name]
+ (mod,_) = modAndOcc 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
+
+get_wired_id id
+ = addImplicitOccsRn (nameSetToList id_mentioned) `thenRn_`
+ returnRn (Avail (getName id) [])
+ where
+ id_mentioned = namesOfType (idType id)
+
+get_wired_tycon tycon
+ | isSynTyCon tycon
+ = addImplicitOccsRn (nameSetToList mentioned) `thenRn_`
+ returnRn (Avail (getName tycon) [])
+ where
+ (tyvars,ty) = getSynTyConDefn tycon
+ mentioned = namesOfType ty `minusNameSet` mkNameSet (map getName tyvars)
-data ParsedIface = ParsedIface
+get_wired_tycon tycon
+ | otherwise -- data or newtype
+ = addImplicitOccsRn (nameSetToList mentioned) `thenRn_`
+ returnRn (Avail (getName tycon) (map getName data_cons))
+ where
+ data_cons = tyConDataCons tycon
+ mentioned = foldr (unionNameSets . namesOfType . idType) emptyNameSet data_cons
\end{code}
-*********************************************************
-* *
-\subsection{Looking for interface files}
-* *
-*********************************************************
+
+%*********************************************************
+%* *
+\subsection{Getting other stuff}
+%* *
+%*********************************************************
+
+\begin{code}
+getInterfaceExports :: Module -> RnMG (Avails, [(OccName,Fixity)])
+getInterfaceExports mod
+ = loadInterface doc_str mod `thenRn` \ (Ifaces _ _ export_envs _ _ _ _) ->
+ case lookupFM export_envs 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
+ where
+ doc_str = ppSep [pprModule PprDebug mod, ppStr "is directly imported"]
+
+
+getImportedInstDecls :: RnMG [IfaceInst]
+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 ->
+ let
+ Ifaces _ _ _ _ _ insts _ = ifaces
+ in
+ returnRn (bagToList insts)
+ where
+ load_it mod = loadInterface (doc_str mod) mod
+ doc_str mod = ppSep [pprModule PprDebug mod, ppStr "is a special-instance module"]
+
+getSpecialInstModules :: RnMG [Module]
+getSpecialInstModules
+ = getIfacesRn `thenRn` \ ifaces ->
+ let
+ Ifaces _ _ _ _ _ _ inst_mods = ifaces
+ in
+ returnRn inst_mods
+\end{code}
\begin{code}
-findHiFiles :: [String] -> PrimIO (FiniteMap Module String)
-findHiFiles dirs = returnPrimIO emptyFM
+getImportVersions :: [AvailInfo] -- Imported avails
+ -> RnMG (VersionInfo Name) -- Version info for these names
+
+getImportVersions imported_avails
+ = 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?
+ in
+ returnRn import_versions
\end{code}
-*********************************************************
-* *
-\subsection{Reading interface files}
-* *
-*********************************************************
+%*********************************************************
+%* *
+\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@).
+
+It doesn't deal with source-code specific things: ValD, DefD. They
+are handled by the sourc-code specific stuff in RnNames.
\begin{code}
-cacheInterface :: IfaceCache -> Module
- -> PrimIO (MaybeErr ParsedIface Error)
-
-cacheInterface iface_var mod
- = readVar iface_var `thenPrimIO` \ (iface_fm, file_fm) ->
- case lookupFM iface_fm mod of
- Just iface -> returnPrimIO (Succeeded iface)
- Nothing ->
- case lookupFM file_fm mod of
- Nothing -> returnPrimIO (Failed (noIfaceErr mod))
- Just file ->
- readInterface file mod `thenPrimIO` \ read_iface ->
- case read_iface of
- Failed err -> returnPrimIO (Failed err)
- Succeeded iface ->
- let
- iface_fm' = addToFM iface_fm mod iface
- in
- writeVar iface_var (iface_fm', file_fm) `thenPrimIO` \ _ ->
- returnPrimIO (Succeeded iface)
-
-
-readInterface :: String -> Module
- -> PrimIO (MaybeErr ParsedIface Error)
-
-readInterface file mod = panic "readInterface"
+getDeclBinders :: (RdrName -> SrcLoc -> RnMG Name) -- New-name function
+ -> RdrNameHsDecl
+ -> RnMG AvailInfo
+
+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])
+
+getDeclBinders new_name (TyD (TySynonym tycon _ _ src_loc))
+ = new_name tycon src_loc `thenRn` \ tycon_name ->
+ returnRn (Avail tycon_name [])
+
+getDeclBinders new_name (ClD (ClassDecl _ cname _ sigs _ _ src_loc))
+ = new_name cname src_loc `thenRn` \ class_name ->
+ mapRn (getClassOpNames new_name) sigs `thenRn` \ sub_names ->
+ returnRn (Avail class_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 [])
+
+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)
+ = 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 [] = returnRn []
+
+getClassOpNames new_name (ClassOpSig op _ _ src_loc) = new_name op src_loc
\end{code}
+%*********************************************************
+%* *
+\subsection{Reading an interface file}
+%* *
+%*********************************************************
+
\begin{code}
-rnInterfaces ::
- IfaceCache -- iface cache
- -> RnEnv -- original name env
- -> UniqSupply
- -> RenamedHsModule -- module to extend with iface decls
- -> [RnName] -- imported names required
- -> PrimIO (RenamedHsModule, -- extended module
- ImplicitEnv, -- implicit names required
- Bag Error,
- Bag Warning)
-
-rnInterfaces iface_var occ_env us rn_module todo
- = returnPrimIO (rn_module, (emptyFM, emptyFM), emptyBag, emptyBag)
+findAndReadIface :: Pretty -> Module -> RnMG (Maybe ParsedIface)
+ -- Nothing <=> file not found, or unreadable, or illegible
+ -- Just x <=> successfully found and parsed
+findAndReadIface doc_str mod
+ = traceRn trace_msg `thenRn_`
+ getSearchPathRn `thenRn` \ dirs ->
+ try dirs dirs
+ 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"
\end{code}
+@readIface@ trys just one file.
\begin{code}
-finalIfaceInfo ::
- IfaceCache -- iface cache
- -> [RnName] -- all imported names required
- -> [Module] -- directly imported modules
- -> PrimIO (VersionInfo, -- info about version numbers
- [Module]) -- special instance modules
+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 ->
+ case read_result of
+ Right contents -> case parseIface contents of
+ Failed err -> failWithRn Nothing err
+ Succeeded iface -> returnRn (Just iface)
+
+ Left (NoSuchThing _) -> returnRn Nothing
-type VersionInfo = [(Module, Version, [(FAST_STRING, Version)])]
+ Left err -> failWithRn Nothing
+ (cannaeReadFile file_path err)
-finalIfaceInfo iface_var imps_reqd imp_mods
- = returnPrimIO ([], [])
\end{code}
+mkSearchPath takes a string consisting of a colon-separated list of directories, and turns it into
+a list of directories. For example:
+
+ mkSearchPath "foo:.:baz" = ["foo", ".", "baz"]
+
+\begin{code}
+mkSearchPath :: Maybe String -> SearchPath
+mkSearchPath Nothing = ["."]
+mkSearchPath (Just s)
+ = go s
+ where
+ go "" = []
+ go s = first : go (drop 1 rest)
+ where
+ (first,rest) = span (/= ':') s
+\end{code}
+
+%*********************************************************
+%* *
+\subsection{Errors}
+%* *
+%*********************************************************
\begin{code}
noIfaceErr mod sty
- = ppCat [ppStr "Could not find interface for", ppPStr mod]
+ = ppBesides [ppStr "Could not find interface for ", ppQuote (pprModule sty mod)]
+-- , ppStr " in"]) 4 (ppAboves (map ppStr dirs))
+
+cannaeReadFile file err sty
+ = ppBesides [ppPStr SLIT("Failed in reading file: "), ppStr file, ppStr "; error=", ppStr (show err)]
\end{code}
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