2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[RnIfaces]{Cacheing and Renaming of Interfaces}
9 getImportedInstDecls, getImportedRules,
10 lookupFixity, loadHomeInterface,
11 importDecl, recordSlurp,
12 getImportVersions, getSlurped,
16 getDeclBinders, getDeclSysBinders
19 #include "HsVersions.h"
21 import CmdLineOpts ( opt_NoPruneDecls, opt_IgnoreIfacePragmas )
22 import HsSyn ( HsDecl(..), TyClDecl(..), InstDecl(..), IfaceSig(..),
23 HsType(..), ConDecl(..), IE(..), ConDetails(..), Sig(..),
24 FixitySig(..), RuleDecl(..),
27 import BasicTypes ( Version, NewOrData(..), defaultFixity )
28 import RdrHsSyn ( RdrNameHsDecl, RdrNameInstDecl, RdrNameTyClDecl, RdrNameRuleDecl,
31 import RnEnv ( mkImportedGlobalName, newImportedBinder, mkImportedGlobalFromRdrName,
34 availName, availNames, addAvailToNameSet,
38 import RnHsSyn ( RenamedHsDecl )
39 import ParseIface ( parseIface, IfaceStuff(..) )
41 import FiniteMap ( FiniteMap, sizeFM, emptyFM, delFromFM,
42 lookupFM, addToFM, addToFM_C, addListToFM,
43 fmToList, elemFM, foldFM
45 import Name ( Name {-instance NamedThing-},
46 nameModule, isLocallyDefined,
47 isWiredInName, nameUnique, NamedThing(..)
49 import Module ( Module, moduleString, pprModule,
50 mkVanillaModule, pprModuleName,
51 moduleUserString, moduleName, isLibModule,
52 ModuleName, WhereFrom(..),
54 import RdrName ( RdrName, rdrNameOcc )
57 import SrcLoc ( mkSrcLoc, SrcLoc )
58 import PrelMods ( pREL_GHC )
59 import PrelInfo ( cCallishTyKeys, thinAirModules )
61 import Maybes ( MaybeErr(..), maybeToBool, orElse )
62 import ListSetOps ( unionLists )
64 import Unique ( Unique )
65 import StringBuffer ( StringBuffer, hGetStringBuffer )
66 import FastString ( mkFastString )
70 import IO ( isDoesNotExistError )
75 %*********************************************************
77 \subsection{Loading a new interface file}
79 %*********************************************************
82 loadHomeInterface :: SDoc -> Name -> RnM d (Module, Ifaces)
83 loadHomeInterface doc_str name
84 = loadInterface doc_str (moduleName (nameModule name)) ImportBySystem
86 loadInterface :: SDoc -> ModuleName -> WhereFrom -> RnM d (Module, Ifaces)
87 loadInterface doc_str mod_name from
88 = getIfacesRn `thenRn` \ ifaces ->
90 mod_map = iImpModInfo ifaces
91 mod_info = lookupFM mod_map mod_name
92 in_map = maybeToBool mod_info
95 -- Issue a warning for a redundant {- SOURCE -} import
96 -- It's redundant if the moduld is in the iImpModInfo at all,
97 -- because we arrange to read all the ordinary imports before
98 -- any of the {- SOURCE -} imports
99 warnCheckRn (not (in_map && case from of {ImportByUserSource -> True; other -> False}))
100 (warnRedundantSourceImport mod_name) `thenRn_`
102 -- CHECK WHETHER WE HAVE IT ALREADY
104 Just (_, _, Just (load_mod, _, _))
105 -> -- We're read it already so don't re-read it
106 returnRn (load_mod, ifaces) ;
110 -- READ THE MODULE IN
111 findAndReadIface doc_str mod_name from in_map
112 `thenRn` \ (hi_boot_read, read_result) ->
113 case read_result of {
114 Nothing -> -- Not found, so add an empty export env to the Ifaces map
115 -- so that we don't look again
117 mod = mkVanillaModule mod_name
118 new_mod_map = addToFM mod_map mod_name (0, False, Just (mod, False, []))
119 new_ifaces = ifaces { iImpModInfo = new_mod_map }
121 setIfacesRn new_ifaces `thenRn_`
122 failWithRn (mod, new_ifaces) (noIfaceErr mod hi_boot_read) ;
127 -- LOAD IT INTO Ifaces
129 -- NB: *first* we do loadDecl, so that the provenance of all the locally-defined
130 --- names is done correctly (notably, whether this is an .hi file or .hi-boot file).
131 -- If we do loadExport first the wrong info gets into the cache (unless we
132 -- explicitly tag each export which seems a bit of a bore)
134 getModuleRn `thenRn` \ this_mod_nm ->
136 rd_decls = pi_decls iface
138 foldlRn (loadDecl mod) (iDecls ifaces) rd_decls `thenRn` \ new_decls ->
139 foldlRn (loadInstDecl mod) (iInsts ifaces) (pi_insts iface) `thenRn` \ new_insts ->
140 foldlRn (loadRule mod) (iRules ifaces) (pi_rules iface) `thenRn` \ new_rules ->
141 foldlRn (loadFixDecl mod_name) (iFixes ifaces) rd_decls `thenRn` \ new_fixities ->
142 mapRn (loadExport this_mod_nm) (pi_exports iface) `thenRn` \ avails_s ->
144 -- For an explicit user import, add to mod_map info about
145 -- the things the imported module depends on, extracted
146 -- from its usage info.
147 mod_map1 = case from of
148 ImportByUser -> addModDeps mod mod_map (pi_usages iface)
151 -- Now add info about this module
152 mod_map2 = addToFM mod_map1 mod_name mod_details
153 mod_details = (pi_mod iface, pi_orphan iface, Just (mod, hi_boot_read, concat avails_s))
155 new_ifaces = ifaces { iImpModInfo = mod_map2,
157 iFixes = new_fixities,
161 setIfacesRn new_ifaces `thenRn_`
162 returnRn (mod, new_ifaces)
165 addModDeps :: Module -> ImportedModuleInfo
166 -> [ImportVersion a] -> ImportedModuleInfo
167 addModDeps mod mod_deps new_deps
168 = foldr add mod_deps new_deps
170 is_lib = isLibModule mod -- Don't record dependencies when importing a library module
171 add (imp_mod, version, has_orphans, _) deps
172 | is_lib && not has_orphans = deps
173 | otherwise = addToFM_C combine deps imp_mod (version, has_orphans, Nothing)
174 -- Record dependencies for modules that are
175 -- either are dependent via a non-library module
176 -- or contain orphan rules or instance decls
178 -- Don't ditch a module that's already loaded!!
179 combine old@(_, _, Just _) new = old
180 combine old@(_, _, Nothing) new = new
182 loadExport :: ModuleName -> ExportItem -> RnM d [AvailInfo]
183 loadExport this_mod (mod, entities)
184 | mod == this_mod = returnRn []
185 -- If the module exports anything defined in this module, just ignore it.
186 -- Reason: otherwise it looks as if there are two local definition sites
187 -- for the thing, and an error gets reported. Easiest thing is just to
188 -- filter them out up front. This situation only arises if a module
189 -- imports itself, or another module that imported it. (Necessarily,
190 -- this invoves a loop.) Consequence: if you say
195 -- module B( AType ) where
196 -- import {-# SOURCE #-} A( AType )
198 -- then you'll get a 'B does not export AType' message. A bit bogus
199 -- but it's a bogus thing to do!
202 = mapRn (load_entity mod) entities
204 new_name mod occ = mkImportedGlobalName mod occ
206 load_entity mod (Avail occ)
207 = new_name mod occ `thenRn` \ name ->
208 returnRn (Avail name)
209 load_entity mod (AvailTC occ occs)
210 = new_name mod occ `thenRn` \ name ->
211 mapRn (new_name mod) occs `thenRn` \ names ->
212 returnRn (AvailTC name names)
215 loadFixDecl :: ModuleName -> FixityEnv
216 -> (Version, RdrNameHsDecl)
218 loadFixDecl mod_name fixity_env (version, FixD sig@(FixitySig rdr_name fixity loc))
219 = -- Ignore the version; when the fixity changes the version of
220 -- its 'host' entity changes, so we don't need a separate version
221 -- number for fixities
222 mkImportedGlobalName mod_name (rdrNameOcc rdr_name) `thenRn` \ name ->
224 new_fixity_env = addToNameEnv fixity_env name (FixitySig name fixity loc)
226 returnRn new_fixity_env
228 -- Ignore the other sorts of decl
229 loadFixDecl mod_name fixity_env other_decl = returnRn fixity_env
233 -> (Version, RdrNameHsDecl)
236 loadDecl mod decls_map (version, decl)
237 = getDeclBinders new_name decl `thenRn` \ maybe_avail ->
238 case maybe_avail of {
239 Nothing -> returnRn decls_map; -- No bindings
242 getDeclSysBinders new_name decl `thenRn` \ sys_bndrs ->
244 main_name = availName avail
245 new_decls_map = foldl add_decl decls_map
246 [ (name, (version, avail, name==main_name, (mod, decl')))
247 | name <- sys_bndrs ++ availNames avail]
248 add_decl decls_map (name, stuff)
249 = WARN( name `elemNameEnv` decls_map, ppr name )
250 addToNameEnv decls_map name stuff
252 returnRn new_decls_map
255 -- newImportedBinder puts into the cache the binder with the
256 -- module information set correctly. When the decl is later renamed,
257 -- the binding site will thereby get the correct module.
258 new_name rdr_name loc = newImportedBinder mod rdr_name
261 If a signature decl is being loaded, and optIgnoreIfacePragmas is on,
262 we toss away unfolding information.
264 Also, if the signature is loaded from a module we're importing from source,
265 we do the same. This is to avoid situations when compiling a pair of mutually
266 recursive modules, peering at unfolding info in the interface file of the other,
267 e.g., you compile A, it looks at B's interface file and may as a result change
268 its interface file. Hence, B is recompiled, maybe changing its interface file,
269 which will the unfolding info used in A to become invalid. Simple way out is to
270 just ignore unfolding info.
272 [Jan 99: I junked the second test above. If we're importing from an hi-boot
273 file there isn't going to *be* any pragma info. Maybe the above comment
274 dates from a time where we picked up a .hi file first if it existed?]
277 SigD (IfaceSig name tp ls loc) | opt_IgnoreIfacePragmas
278 -> SigD (IfaceSig name tp [] loc)
281 loadInstDecl :: Module
284 -> RnM d (Bag GatedDecl)
285 loadInstDecl mod insts decl@(InstDecl inst_ty binds uprags dfun_name src_loc)
287 -- Find out what type constructors and classes are "gates" for the
288 -- instance declaration. If all these "gates" are slurped in then
289 -- we should slurp the instance decl too.
291 -- We *don't* want to count names in the context part as gates, though.
293 -- instance Foo a => Baz (T a) where ...
295 -- Here the gates are Baz and T, but *not* Foo.
297 munged_inst_ty = removeContext inst_ty
298 free_names = extractHsTyRdrNames munged_inst_ty
300 setModuleRn (moduleName mod) $
301 mapRn mkImportedGlobalFromRdrName free_names `thenRn` \ gate_names ->
302 returnRn ((mkNameSet gate_names, (mod, InstD decl)) `consBag` insts)
305 -- In interface files, the instance decls now look like
306 -- forall a. Foo a -> Baz (T a)
307 -- so we have to strip off function argument types as well
308 -- as the bit before the '=>' (which is always empty in interface files)
309 removeContext (HsForAllTy tvs cxt ty) = HsForAllTy tvs [] (removeFuns ty)
310 removeContext ty = removeFuns ty
312 removeFuns (MonoFunTy _ ty) = removeFuns ty
316 loadRule :: Module -> Bag GatedDecl
317 -> RdrNameRuleDecl -> RnM d (Bag GatedDecl)
318 -- "Gate" the rule simply by whether the rule variable is
319 -- needed. We can refine this later.
320 loadRule mod rules decl@(IfaceRuleDecl var body src_loc)
321 = setModuleRn (moduleName mod) $
322 mkImportedGlobalFromRdrName var `thenRn` \ var_name ->
323 returnRn ((unitNameSet var_name, (mod, RuleD decl)) `consBag` rules)
327 %********************************************************
329 \subsection{Loading usage information}
331 %********************************************************
334 checkUpToDate :: ModuleName -> RnMG Bool -- True <=> no need to recompile
335 checkUpToDate mod_name
336 = getIfacesRn `thenRn` \ ifaces ->
337 findAndReadIface doc_str mod_name
339 (error "checkUpToDate") `thenRn` \ (_, read_result) ->
341 -- CHECK WHETHER WE HAVE IT ALREADY
343 Nothing -> -- Old interface file not found, so we'd better bail out
344 traceRn (sep [ptext SLIT("Didnt find old iface"),
345 pprModuleName mod_name]) `thenRn_`
349 -> -- Found it, so now check it
350 checkModUsage (pi_usages iface)
352 -- Only look in current directory, with suffix .hi
353 doc_str = sep [ptext SLIT("need usage info from"), pprModuleName mod_name]
355 checkModUsage [] = returnRn True -- Yes! Everything is up to date!
357 checkModUsage ((mod_name, old_mod_vers, _, whats_imported) : rest)
358 = loadInterface doc_str mod_name ImportBySystem `thenRn` \ (mod, ifaces) ->
360 maybe_mod_vers = case lookupFM (iImpModInfo ifaces) mod_name of
361 Just (version, _, Just (_, _, _)) -> Just version
364 case maybe_mod_vers of {
365 Nothing -> -- If we can't find a version number for the old module then
366 -- bail out saying things aren't up to date
367 traceRn (sep [ptext SLIT("Can't find version number for module"),
368 pprModuleName mod_name])
369 `thenRn_` returnRn False ;
373 -- If the module version hasn't changed, just move on
374 if new_mod_vers == old_mod_vers then
375 traceRn (sep [ptext SLIT("Module version unchanged:"), pprModuleName mod_name])
376 `thenRn_` checkModUsage rest
378 traceRn (sep [ptext SLIT("Module version has changed:"), pprModuleName mod_name])
380 -- Module version changed, so check entities inside
382 -- If the usage info wants to say "I imported everything from this module"
383 -- it does so by making whats_imported equal to Everything
384 -- In that case, we must recompile
385 case whats_imported of {
386 Everything -> traceRn (ptext SLIT("...and I needed the whole module")) `thenRn_`
387 returnRn False; -- Bale out
389 Specifically old_local_vers ->
391 -- Non-empty usage list, so check item by item
392 checkEntityUsage mod_name (iDecls ifaces) old_local_vers `thenRn` \ up_to_date ->
394 traceRn (ptext SLIT("...but the bits I use haven't.")) `thenRn_`
395 checkModUsage rest -- This one's ok, so check the rest
397 returnRn False -- This one failed, so just bail out now
400 doc_str = sep [ptext SLIT("need version info for"), pprModuleName mod_name]
403 checkEntityUsage mod decls []
404 = returnRn True -- Yes! All up to date!
406 checkEntityUsage mod decls ((occ_name,old_vers) : rest)
407 = mkImportedGlobalName mod occ_name `thenRn` \ name ->
408 case lookupNameEnv decls name of
410 Nothing -> -- We used it before, but it ain't there now
411 putDocRn (sep [ptext SLIT("No longer exported:"), ppr name])
412 `thenRn_` returnRn False
414 Just (new_vers,_,_,_) -- It's there, but is it up to date?
415 | new_vers == old_vers
416 -- Up to date, so check the rest
417 -> checkEntityUsage mod decls rest
420 -- Out of date, so bale out
421 -> putDocRn (sep [ptext SLIT("Out of date:"), ppr name]) `thenRn_`
426 %*********************************************************
428 \subsection{Getting in a declaration}
430 %*********************************************************
433 importDecl :: Name -> RnMG (Maybe (Module, RdrNameHsDecl))
434 -- Returns Nothing for
437 -- (c) already slurped
443 = getSlurped `thenRn` \ already_slurped ->
444 if name `elemNameSet` already_slurped then
445 returnRn Nothing -- Already dealt with
447 getModuleRn `thenRn` \ this_mod ->
449 mod = moduleName (nameModule name)
451 if mod == this_mod then -- Don't bring in decls from
452 -- the renamed module's own interface file
453 addWarnRn (importDeclWarn mod name) `thenRn_`
456 getNonWiredInDecl name
460 getNonWiredInDecl :: Name -> RnMG (Maybe (Module, RdrNameHsDecl))
461 getNonWiredInDecl needed_name
462 = traceRn doc_str `thenRn_`
463 loadHomeInterface doc_str needed_name `thenRn` \ (_, ifaces) ->
464 case lookupNameEnv (iDecls ifaces) needed_name of
466 Just (version,avail,_,decl)
467 -> recordSlurp (Just version) avail `thenRn_`
470 Nothing -- Can happen legitimately for "Optional" occurrences
471 -> addErrRn (getDeclErr needed_name) `thenRn_`
474 doc_str = ptext SLIT("need decl for") <+> ppr needed_name
477 @getWiredInDecl@ maps a wired-in @Name@ to what it makes available.
478 It behaves exactly as if the wired in decl were actually in an interface file.
481 \item if the wired-in name is a data type constructor or a data constructor,
482 it brings in the type constructor and all the data constructors; and
483 marks as ``occurrences'' any free vars of the data con.
485 \item similarly for synonum type constructor
487 \item if the wired-in name is another wired-in Id, it marks as ``occurrences''
488 the free vars of the Id's type.
490 \item it loads the interface file for the wired-in thing for the
491 sole purpose of making sure that its instance declarations are available
493 All this is necessary so that we know all types that are ``in play'', so
494 that we know just what instances to bring into scope.
499 %*********************************************************
501 \subsection{Getting what a module exports}
503 %*********************************************************
505 @getInterfaceExports@ is called only for directly-imported modules.
508 getInterfaceExports :: ModuleName -> WhereFrom -> RnMG (Module, Avails)
509 getInterfaceExports mod_name from
510 = loadInterface doc_str mod_name from `thenRn` \ (mod, ifaces) ->
511 case lookupFM (iImpModInfo ifaces) mod_name of
512 Nothing -> -- Not there; it must be that the interface file wasn't found;
513 -- the error will have been reported already.
514 -- (Actually loadInterface should put the empty export env in there
515 -- anyway, but this does no harm.)
518 Just (_, _, Just (mod, _, avails)) -> returnRn (mod, avails)
520 doc_str = sep [pprModuleName mod_name, ptext SLIT("is directly imported")]
524 %*********************************************************
526 \subsection{Instance declarations are handled specially}
528 %*********************************************************
531 getImportedInstDecls :: NameSet -> RnMG [(Module,RdrNameHsDecl)]
532 getImportedInstDecls gates
533 = -- First load any orphan-instance modules that aren't aready loaded
534 -- Orphan-instance modules are recorded in the module dependecnies
535 getIfacesRn `thenRn` \ ifaces ->
538 [mod | (mod, (_, True, Nothing)) <- fmToList (iImpModInfo ifaces)]
540 traceRn (text "Loading orphan modules" <+> fsep (map pprModuleName orphan_mods))
541 `thenRn_` mapRn_ load_it orphan_mods `thenRn_`
543 -- Now we're ready to grab the instance declarations
544 -- Find the un-gated ones and return them,
545 -- removing them from the bag kept in Ifaces
546 getIfacesRn `thenRn` \ ifaces ->
548 (decls, new_insts) = selectGated gates (iInsts ifaces)
550 setIfacesRn (ifaces { iInsts = new_insts }) `thenRn_`
552 traceRn (sep [text "getImportedInstDecls:",
553 nest 4 (fsep (map ppr (nameSetToList gates))),
554 text "Slurped" <+> int (length decls)
555 <+> text "instance declarations"]) `thenRn_`
558 load_it mod = loadInterface (doc_str mod) mod ImportBySystem
559 doc_str mod = sep [pprModuleName mod, ptext SLIT("is a orphan-instance module")]
561 getImportedRules :: RnMG [(Module,RdrNameHsDecl)]
563 = getIfacesRn `thenRn` \ ifaces ->
565 gates = iSlurp ifaces -- Anything at all that's been slurped
566 (decls, new_rules) = selectGated gates (iRules ifaces)
568 setIfacesRn (ifaces { iRules = new_rules }) `thenRn_`
569 traceRn (sep [text "getImportedRules:",
570 text "Slurped" <+> int (length decls) <+> text "rules"]) `thenRn_`
573 selectGated gates decl_bag
575 | opt_NoPruneDecls -- Just to try the effect of not gating at all
576 = (foldrBag (\ (_,d) ds -> d:ds) [] decl_bag, emptyBag) -- Grab them all
580 = foldrBag select ([], emptyBag) decl_bag
582 select (reqd, decl) (yes, no)
583 | isEmptyNameSet (reqd `minusNameSet` gates) = (decl:yes, no)
584 | otherwise = (yes, (reqd,decl) `consBag` no)
586 lookupFixity :: Name -> RnMS Fixity
588 | isLocallyDefined name
589 = getFixityEnv `thenRn` \ local_fix_env ->
590 case lookupNameEnv local_fix_env name of
591 Just (FixitySig _ fix _) -> returnRn fix
592 Nothing -> returnRn defaultFixity
594 | otherwise -- Imported
595 = loadHomeInterface doc name `thenRn` \ (_, ifaces) ->
596 case lookupNameEnv (iFixes ifaces) name of
597 Just (FixitySig _ fix _) -> returnRn fix
598 Nothing -> returnRn defaultFixity
600 doc = ptext SLIT("Checking fixity for") <+> ppr name
604 %*********************************************************
606 \subsection{Keeping track of what we've slurped, and version numbers}
608 %*********************************************************
610 getImportVersions figures out
611 what the ``usage information'' for this moudule is;
612 that is, what it must record in its interface file as the things it uses.
615 \item anything reachable from its body code
616 \item any module exported with a @module Foo@.
619 Why the latter? Because if @Foo@ changes then this module's export list
620 will change, so we must recompile this module at least as far as
621 making a new interface file --- but in practice that means complete
626 module A( f, g ) where | module B( f ) where
627 import B( f ) | f = h 3
630 Should we record @B.f@ in @A@'s usages? In fact we don't. Certainly, if
631 anything about @B.f@ changes than anyone who imports @A@ should be recompiled;
632 they'll get an early exit if they don't use @B.f@. However, even if @B.f@
633 doesn't change at all, @B.h@ may do so, and this change may not be reflected
634 in @f@'s version number. So there are two things going on when compiling module @A@:
636 \item Are @A.o@ and @A.hi@ correct? Then we can bale out early.
637 \item Should modules that import @A@ be recompiled?
639 For (1) it is slightly harmful to record @B.f@ in @A@'s usages,
640 because a change in @B.f@'s version will provoke full recompilation of @A@,
641 producing an identical @A.o@,
642 and @A.hi@ differing only in its usage-version of @B.f@
643 (which isn't used by any importer).
645 For (2), because of the tricky @B.h@ question above,
646 we ensure that @A.hi@ is touched
647 (even if identical to its previous version)
648 if A's recompilation was triggered by an imported @.hi@ file date change.
649 Given that, there's no need to record @B.f@ in @A@'s usages.
651 On the other hand, if @A@ exports @module B@,
652 then we {\em do} count @module B@ among @A@'s usages,
653 because we must recompile @A@ to ensure that @A.hi@ changes appropriately.
656 getImportVersions :: ModuleName -- Name of this module
657 -> Maybe [IE any] -- Export list for this module
658 -> RnMG (VersionInfo Name) -- Version info for these names
660 getImportVersions this_mod exports
661 = getIfacesRn `thenRn` \ ifaces ->
663 mod_map = iImpModInfo ifaces
664 imp_names = iVSlurp ifaces
666 -- mv_map groups together all the things imported from a particular module.
667 mv_map1, mv_map2 :: FiniteMap ModuleName (WhatsImported Name)
669 -- mv_map1 records all the modules that have a "module M"
670 -- in this module's export list with an "Everything"
671 mv_map1 = foldr add_mod emptyFM export_mods
673 -- mv_map2 adds the version numbers of things exported individually
674 mv_map2 = foldr add_mv mv_map1 imp_names
676 -- Build the result list by adding info for each module,
677 -- *omitting* (a) library modules
678 -- (b) source-imported modules
679 mk_version_info mod_name (version, has_orphans, cts) so_far
680 | omit cts = so_far -- Don't record usage info for this module
681 | otherwise = (mod_name, version, has_orphans, whats_imported) : so_far
683 whats_imported = case lookupFM mv_map2 mod_name of
685 Nothing -> Specifically []
687 omit (Just (mod, boot_import, _)) = isLibModule mod || boot_import
690 returnRn (foldFM mk_version_info [] mod_map)
692 export_mods = case exports of
694 Just es -> [mod | IEModuleContents mod <- es, mod /= this_mod]
696 add_mv v@(name, version) mv_map
697 = addToFM_C add_item mv_map mod (Specifically [v])
699 mod = moduleName (nameModule name)
701 add_item Everything _ = Everything
702 add_item (Specifically xs) _ = Specifically (v:xs)
704 add_mod mod mv_map = addToFM mv_map mod Everything
709 = getIfacesRn `thenRn` \ ifaces ->
710 returnRn (iSlurp ifaces)
712 recordSlurp maybe_version avail
713 = getIfacesRn `thenRn` \ ifaces@(Ifaces { iSlurp = slurped_names,
714 iVSlurp = imp_names }) ->
716 new_slurped_names = addAvailToNameSet slurped_names avail
718 new_imp_names = case maybe_version of
719 Just version -> (availName avail, version) : imp_names
722 setIfacesRn (ifaces { iSlurp = new_slurped_names,
723 iVSlurp = new_imp_names })
727 %*********************************************************
729 \subsection{Getting binders out of a declaration}
731 %*********************************************************
733 @getDeclBinders@ returns the names for a @RdrNameHsDecl@.
734 It's used for both source code (from @availsFromDecl@) and interface files
737 It doesn't deal with source-code specific things: @ValD@, @DefD@. They
738 are handled by the sourc-code specific stuff in @RnNames@.
741 getDeclBinders :: (RdrName -> SrcLoc -> RnM d Name) -- New-name function
743 -> RnM d (Maybe AvailInfo)
745 getDeclBinders new_name (TyClD (TyData _ _ tycon _ condecls _ _ src_loc))
746 = new_name tycon src_loc `thenRn` \ tycon_name ->
747 getConFieldNames new_name condecls `thenRn` \ sub_names ->
748 returnRn (Just (AvailTC tycon_name (tycon_name : nub sub_names)))
749 -- The "nub" is because getConFieldNames can legitimately return duplicates,
750 -- when a record declaration has the same field in multiple constructors
752 getDeclBinders new_name (TyClD (TySynonym tycon _ _ src_loc))
753 = new_name tycon src_loc `thenRn` \ tycon_name ->
754 returnRn (Just (AvailTC tycon_name [tycon_name]))
756 getDeclBinders new_name (TyClD (ClassDecl _ cname _ sigs _ _ _ _ _ src_loc))
757 = new_name cname src_loc `thenRn` \ class_name ->
759 -- Record the names for the class ops
761 -- just want class-op sigs
762 op_sigs = filter isClassOpSig sigs
764 mapRn (getClassOpNames new_name) op_sigs `thenRn` \ sub_names ->
766 returnRn (Just (AvailTC class_name (class_name : sub_names)))
768 getDeclBinders new_name (SigD (IfaceSig var ty prags src_loc))
769 = new_name var src_loc `thenRn` \ var_name ->
770 returnRn (Just (Avail var_name))
772 getDeclBinders new_name (FixD _) = returnRn Nothing
773 getDeclBinders new_name (ForD _) = returnRn Nothing
774 getDeclBinders new_name (DefD _) = returnRn Nothing
775 getDeclBinders new_name (InstD _) = returnRn Nothing
776 getDeclBinders new_name (RuleD _) = returnRn Nothing
779 getConFieldNames new_name (ConDecl con _ _ (RecCon fielddecls) src_loc : rest)
780 = mapRn (\n -> new_name n src_loc) (con:fields) `thenRn` \ cfs ->
781 getConFieldNames new_name rest `thenRn` \ ns ->
784 fields = concat (map fst fielddecls)
786 getConFieldNames new_name (ConDecl con _ _ condecl src_loc : rest)
787 = new_name con src_loc `thenRn` \ n ->
790 new_name f src_loc `thenRn` \ new_f ->
792 _ -> returnRn [n]) `thenRn` \ nn ->
793 getConFieldNames new_name rest `thenRn` \ ns ->
796 getConFieldNames new_name [] = returnRn []
798 getClassOpNames new_name (ClassOpSig op _ _ src_loc) = new_name op src_loc
801 @getDeclSysBinders@ gets the implicit binders introduced by a decl.
802 A the moment that's just the tycon and datacon that come with a class decl.
803 They aren't returned by @getDeclBinders@ because they aren't in scope;
804 but they {\em should} be put into the @DeclsMap@ of this module.
806 Note that this excludes the default-method names of a class decl,
807 and the dict fun of an instance decl, because both of these have
808 bindings of their own elsewhere.
811 getDeclSysBinders new_name (TyClD (ClassDecl _ cname _ sigs _ _ tname dname snames src_loc))
812 = new_name dname src_loc `thenRn` \ datacon_name ->
813 new_name tname src_loc `thenRn` \ tycon_name ->
814 sequenceRn [new_name n src_loc | n <- snames] `thenRn` \ scsel_names ->
815 returnRn (tycon_name : datacon_name : scsel_names)
817 getDeclSysBinders new_name other_decl
821 %*********************************************************
823 \subsection{Reading an interface file}
825 %*********************************************************
828 findAndReadIface :: SDoc -> ModuleName -> WhereFrom
829 -> Bool -- Only relevant for SystemImport
830 -- True <=> Look for a .hi file
831 -- False <=> Look for .hi-boot file unless there's
832 -- a library .hi file
833 -> RnM d (Bool, Maybe (Module, ParsedIface))
834 -- Bool is True if the interface actually read was a .hi-boot one
835 -- Nothing <=> file not found, or unreadable, or illegible
836 -- Just x <=> successfully found and parsed
838 findAndReadIface doc_str mod_name from hi_file
839 = traceRn trace_msg `thenRn_`
840 -- we keep two maps for interface files,
841 -- one for 'normal' ones, the other for .hi-boot files,
842 -- hence the need to signal which kind we're interested.
844 getHiMaps `thenRn` \ hi_maps ->
846 case find_path from hi_maps of
848 (hi_boot, Just (fpath, mod)) -> traceRn (ptext SLIT("...reading from") <+> text fpath)
850 readIface mod fpath `thenRn` \ result ->
851 returnRn (hi_boot, result)
852 (hi_boot, Nothing) -> traceRn (ptext SLIT("...not found")) `thenRn_`
853 returnRn (hi_boot, Nothing)
855 find_path ImportByUser (hi_map, _) = (False, lookupFM hi_map mod_name)
856 find_path ImportByUserSource (_, hiboot_map) = (True, lookupFM hiboot_map mod_name)
858 find_path ImportBySystem (hi_map, hiboot_map)
860 = -- If the module we seek is in our dependent set,
861 -- Look for a .hi file
862 (False, lookupFM hi_map mod_name)
865 -- Check if there's a library module of that name
866 -- If not, look for an hi-boot file
867 = case lookupFM hi_map mod_name of
868 stuff@(Just (_, mod)) | isLibModule mod -> (False, stuff)
869 other -> (True, lookupFM hiboot_map mod_name)
871 trace_msg = sep [hsep [ptext SLIT("Reading"),
873 ptext SLIT("interface for"),
874 pprModuleName mod_name <> semi],
875 nest 4 (ptext SLIT("reason:") <+> doc_str)]
878 @readIface@ tries just the one file.
881 readIface :: Module -> String -> RnM d (Maybe (Module, ParsedIface))
882 -- Nothing <=> file not found, or unreadable, or illegible
883 -- Just x <=> successfully found and parsed
884 readIface the_mod file_path
885 = ioToRnM (hGetStringBuffer False file_path) `thenRn` \ read_result ->
888 case parseIface contents
889 PState{ bol = 0#, atbol = 1#,
892 loc = mkSrcLoc (mkFastString file_path) 1 } of
893 PFailed err -> failWithRn Nothing err
894 POk _ (PIface mod_nm iface) ->
895 warnCheckRn (mod_nm == moduleName the_mod)
896 (hsep [ ptext SLIT("Something is amiss; requested module name")
898 , ptext SLIT("differs from name found in the interface file ")
899 , pprModuleName mod_nm
901 `thenRn_` returnRn (Just (the_mod, iface))
904 | isDoesNotExistError err -> returnRn Nothing
905 | otherwise -> failWithRn Nothing (cannaeReadFile file_path err)
908 %*********************************************************
912 %*********************************************************
915 noIfaceErr filename boot_file
916 = hsep [ptext SLIT("Could not find valid"), boot,
917 ptext SLIT("interface file"), quotes (pprModule filename)]
919 boot | boot_file = ptext SLIT("[boot]")
922 cannaeReadFile file err
923 = hcat [ptext SLIT("Failed in reading file: "),
925 ptext SLIT("; error="),
929 = ptext SLIT("Failed to find interface decl for") <+> quotes (ppr name)
932 = sep [ptext SLIT("Failed to find (optional) interface decl for") <+> quotes (ppr name),
933 ptext SLIT("desired at") <+> ppr loc]
935 importDeclWarn mod name
937 "Compiler tried to import decl from interface file with same name as module."),
939 "(possible cause: module name clashes with interface file already in scope.)")
941 hsep [ptext SLIT("Interface:"), quotes (pprModuleName mod),
942 comma, ptext SLIT("name:"), quotes (ppr name)]
944 warnRedundantSourceImport mod_name
945 = ptext SLIT("Unnecessary {- SOURCE -} in the import of module")
946 <+> quotes (pprModuleName mod_name)