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,
17 removeContext -- removeContext probably belongs somewhere else
20 #include "HsVersions.h"
22 import CmdLineOpts ( opt_NoPruneDecls, opt_IgnoreIfacePragmas )
23 import HsSyn ( HsDecl(..), TyClDecl(..), InstDecl(..), IfaceSig(..),
24 HsType(..), ConDecl(..), IE(..), ConDetails(..), Sig(..),
25 FixitySig(..), RuleDecl(..),
28 import BasicTypes ( Version, NewOrData(..), defaultFixity )
29 import RdrHsSyn ( RdrNameHsDecl, RdrNameInstDecl, RdrNameTyClDecl, RdrNameRuleDecl,
32 import RnEnv ( mkImportedGlobalName, newImportedBinder, mkImportedGlobalFromRdrName,
35 availName, availNames, addAvailToNameSet,
39 import RnHsSyn ( RenamedHsDecl )
40 import ParseIface ( parseIface, IfaceStuff(..) )
42 import FiniteMap ( FiniteMap, sizeFM, emptyFM, delFromFM,
43 lookupFM, addToFM, addToFM_C, addListToFM,
44 fmToList, elemFM, foldFM
46 import Name ( Name {-instance NamedThing-},
47 nameModule, isLocallyDefined,
48 isWiredInName, nameUnique, NamedThing(..)
50 import Module ( Module, moduleString, pprModule,
51 mkVanillaModule, pprModuleName,
52 moduleUserString, moduleName, isLibModule,
53 ModuleName, WhereFrom(..),
55 import RdrName ( RdrName, rdrNameOcc )
58 import SrcLoc ( mkSrcLoc, SrcLoc )
59 import PrelMods ( pREL_GHC )
60 import PrelInfo ( cCallishTyKeys, thinAirModules )
62 import Maybes ( MaybeErr(..), maybeToBool, orElse )
63 import ListSetOps ( unionLists )
65 import Unique ( Unique )
66 import StringBuffer ( StringBuffer, hGetStringBuffer )
67 import FastString ( mkFastString )
71 import IO ( isDoesNotExistError )
76 %*********************************************************
78 \subsection{Loading a new interface file}
80 %*********************************************************
83 loadHomeInterface :: SDoc -> Name -> RnM d (Module, Ifaces)
84 loadHomeInterface doc_str name
85 = loadInterface doc_str (moduleName (nameModule name)) ImportBySystem
87 loadInterface :: SDoc -> ModuleName -> WhereFrom -> RnM d (Module, Ifaces)
88 loadInterface doc_str mod_name from
89 = getIfacesRn `thenRn` \ ifaces ->
91 mod_map = iImpModInfo ifaces
92 mod_info = lookupFM mod_map mod_name
93 in_map = maybeToBool mod_info
96 -- Issue a warning for a redundant {- SOURCE -} import
97 -- It's redundant if the moduld is in the iImpModInfo at all,
98 -- because we arrange to read all the ordinary imports before
99 -- any of the {- SOURCE -} imports
100 warnCheckRn (not (in_map && case from of {ImportByUserSource -> True; other -> False}))
101 (warnRedundantSourceImport mod_name) `thenRn_`
103 -- CHECK WHETHER WE HAVE IT ALREADY
105 Just (_, _, Just (load_mod, _, _))
106 -> -- We're read it already so don't re-read it
107 returnRn (load_mod, ifaces) ;
111 -- READ THE MODULE IN
112 findAndReadIface doc_str mod_name from in_map
113 `thenRn` \ (hi_boot_read, read_result) ->
114 case read_result of {
115 Nothing -> -- Not found, so add an empty export env to the Ifaces map
116 -- so that we don't look again
118 mod = mkVanillaModule mod_name
119 new_mod_map = addToFM mod_map mod_name (0, False, Just (mod, False, []))
120 new_ifaces = ifaces { iImpModInfo = new_mod_map }
122 setIfacesRn new_ifaces `thenRn_`
123 failWithRn (mod, new_ifaces) (noIfaceErr mod hi_boot_read) ;
128 -- LOAD IT INTO Ifaces
130 -- NB: *first* we do loadDecl, so that the provenance of all the locally-defined
131 --- names is done correctly (notably, whether this is an .hi file or .hi-boot file).
132 -- If we do loadExport first the wrong info gets into the cache (unless we
133 -- explicitly tag each export which seems a bit of a bore)
135 getModuleRn `thenRn` \ this_mod_nm ->
137 rd_decls = pi_decls iface
139 foldlRn (loadDecl mod) (iDecls ifaces) rd_decls `thenRn` \ new_decls ->
140 foldlRn (loadInstDecl mod) (iInsts ifaces) (pi_insts iface) `thenRn` \ new_insts ->
141 foldlRn (loadRule mod) (iRules ifaces) (pi_rules iface) `thenRn` \ new_rules ->
142 foldlRn (loadFixDecl mod_name) (iFixes ifaces) rd_decls `thenRn` \ new_fixities ->
143 mapRn (loadExport this_mod_nm) (pi_exports iface) `thenRn` \ avails_s ->
145 -- For an explicit user import, add to mod_map info about
146 -- the things the imported module depends on, extracted
147 -- from its usage info.
148 mod_map1 = case from of
149 ImportByUser -> addModDeps mod mod_map (pi_usages iface)
152 -- Now add info about this module
153 mod_map2 = addToFM mod_map1 mod_name mod_details
154 mod_details = (pi_mod iface, pi_orphan iface, Just (mod, hi_boot_read, concat avails_s))
156 new_ifaces = ifaces { iImpModInfo = mod_map2,
158 iFixes = new_fixities,
162 setIfacesRn new_ifaces `thenRn_`
163 returnRn (mod, new_ifaces)
166 addModDeps :: Module -> ImportedModuleInfo
167 -> [ImportVersion a] -> ImportedModuleInfo
168 addModDeps mod mod_deps new_deps
169 = foldr add mod_deps new_deps
171 is_lib = isLibModule mod -- Don't record dependencies when importing a library module
172 add (imp_mod, version, has_orphans, _) deps
173 | is_lib && not has_orphans = deps
174 | otherwise = addToFM_C combine deps imp_mod (version, has_orphans, Nothing)
175 -- Record dependencies for modules that are
176 -- either are dependent via a non-library module
177 -- or contain orphan rules or instance decls
179 -- Don't ditch a module that's already loaded!!
180 combine old@(_, _, Just _) new = old
181 combine old@(_, _, Nothing) new = new
183 loadExport :: ModuleName -> ExportItem -> RnM d [AvailInfo]
184 loadExport this_mod (mod, entities)
185 | mod == this_mod = returnRn []
186 -- If the module exports anything defined in this module, just ignore it.
187 -- Reason: otherwise it looks as if there are two local definition sites
188 -- for the thing, and an error gets reported. Easiest thing is just to
189 -- filter them out up front. This situation only arises if a module
190 -- imports itself, or another module that imported it. (Necessarily,
191 -- this invoves a loop.) Consequence: if you say
196 -- module B( AType ) where
197 -- import {-# SOURCE #-} A( AType )
199 -- then you'll get a 'B does not export AType' message. A bit bogus
200 -- but it's a bogus thing to do!
203 = mapRn (load_entity mod) entities
205 new_name mod occ = mkImportedGlobalName mod occ
207 load_entity mod (Avail occ)
208 = new_name mod occ `thenRn` \ name ->
209 returnRn (Avail name)
210 load_entity mod (AvailTC occ occs)
211 = new_name mod occ `thenRn` \ name ->
212 mapRn (new_name mod) occs `thenRn` \ names ->
213 returnRn (AvailTC name names)
216 loadFixDecl :: ModuleName -> FixityEnv
217 -> (Version, RdrNameHsDecl)
219 loadFixDecl mod_name fixity_env (version, FixD sig@(FixitySig rdr_name fixity loc))
220 = -- Ignore the version; when the fixity changes the version of
221 -- its 'host' entity changes, so we don't need a separate version
222 -- number for fixities
223 mkImportedGlobalName mod_name (rdrNameOcc rdr_name) `thenRn` \ name ->
225 new_fixity_env = addToNameEnv fixity_env name (FixitySig name fixity loc)
227 returnRn new_fixity_env
229 -- Ignore the other sorts of decl
230 loadFixDecl mod_name fixity_env other_decl = returnRn fixity_env
234 -> (Version, RdrNameHsDecl)
237 loadDecl mod decls_map (version, decl)
238 = getDeclBinders new_name decl `thenRn` \ maybe_avail ->
239 case maybe_avail of {
240 Nothing -> returnRn decls_map; -- No bindings
243 getDeclSysBinders new_name decl `thenRn` \ sys_bndrs ->
245 main_name = availName avail
246 new_decls_map = foldl add_decl decls_map
247 [ (name, (version, avail, name==main_name, (mod, decl')))
248 | name <- sys_bndrs ++ availNames avail]
249 add_decl decls_map (name, stuff)
250 = WARN( name `elemNameEnv` decls_map, ppr name )
251 addToNameEnv decls_map name stuff
253 returnRn new_decls_map
256 -- newImportedBinder puts into the cache the binder with the
257 -- module information set correctly. When the decl is later renamed,
258 -- the binding site will thereby get the correct module.
259 new_name rdr_name loc = newImportedBinder mod rdr_name
262 If a signature decl is being loaded, and optIgnoreIfacePragmas is on,
263 we toss away unfolding information.
265 Also, if the signature is loaded from a module we're importing from source,
266 we do the same. This is to avoid situations when compiling a pair of mutually
267 recursive modules, peering at unfolding info in the interface file of the other,
268 e.g., you compile A, it looks at B's interface file and may as a result change
269 its interface file. Hence, B is recompiled, maybe changing its interface file,
270 which will the unfolding info used in A to become invalid. Simple way out is to
271 just ignore unfolding info.
273 [Jan 99: I junked the second test above. If we're importing from an hi-boot
274 file there isn't going to *be* any pragma info. Maybe the above comment
275 dates from a time where we picked up a .hi file first if it existed?]
278 SigD (IfaceSig name tp ls loc) | opt_IgnoreIfacePragmas
279 -> SigD (IfaceSig name tp [] loc)
282 loadInstDecl :: Module
285 -> RnM d (Bag GatedDecl)
286 loadInstDecl mod insts decl@(InstDecl inst_ty binds uprags dfun_name src_loc)
288 -- Find out what type constructors and classes are "gates" for the
289 -- instance declaration. If all these "gates" are slurped in then
290 -- we should slurp the instance decl too.
292 -- We *don't* want to count names in the context part as gates, though.
294 -- instance Foo a => Baz (T a) where ...
296 -- Here the gates are Baz and T, but *not* Foo.
298 munged_inst_ty = removeContext inst_ty
299 free_names = extractHsTyRdrNames munged_inst_ty
301 setModuleRn (moduleName mod) $
302 mapRn mkImportedGlobalFromRdrName free_names `thenRn` \ gate_names ->
303 returnRn ((mkNameSet gate_names, (mod, InstD decl)) `consBag` insts)
306 -- In interface files, the instance decls now look like
307 -- forall a. Foo a -> Baz (T a)
308 -- so we have to strip off function argument types as well
309 -- as the bit before the '=>' (which is always empty in interface files)
310 removeContext (HsForAllTy tvs cxt ty) = HsForAllTy tvs [] (removeFuns ty)
311 removeContext ty = removeFuns ty
313 removeFuns (MonoFunTy _ ty) = removeFuns ty
317 loadRule :: Module -> Bag GatedDecl
318 -> RdrNameRuleDecl -> RnM d (Bag GatedDecl)
319 -- "Gate" the rule simply by whether the rule variable is
320 -- needed. We can refine this later.
321 loadRule mod rules decl@(IfaceRuleDecl var body src_loc)
322 = setModuleRn (moduleName mod) $
323 mkImportedGlobalFromRdrName var `thenRn` \ var_name ->
324 returnRn ((unitNameSet var_name, (mod, RuleD decl)) `consBag` rules)
328 %********************************************************
330 \subsection{Loading usage information}
332 %********************************************************
335 checkUpToDate :: ModuleName -> RnMG Bool -- True <=> no need to recompile
336 checkUpToDate mod_name
337 = getIfacesRn `thenRn` \ ifaces ->
338 findAndReadIface doc_str mod_name
340 (error "checkUpToDate") `thenRn` \ (_, read_result) ->
342 -- CHECK WHETHER WE HAVE IT ALREADY
344 Nothing -> -- Old interface file not found, so we'd better bail out
345 traceRn (sep [ptext SLIT("Didnt find old iface"),
346 pprModuleName mod_name]) `thenRn_`
350 -> -- Found it, so now check it
351 checkModUsage (pi_usages iface)
353 -- Only look in current directory, with suffix .hi
354 doc_str = sep [ptext SLIT("need usage info from"), pprModuleName mod_name]
356 checkModUsage [] = returnRn True -- Yes! Everything is up to date!
358 checkModUsage ((mod_name, old_mod_vers, _, whats_imported) : rest)
359 = loadInterface doc_str mod_name ImportBySystem `thenRn` \ (mod, ifaces) ->
361 maybe_mod_vers = case lookupFM (iImpModInfo ifaces) mod_name of
362 Just (version, _, Just (_, _, _)) -> Just version
365 case maybe_mod_vers of {
366 Nothing -> -- If we can't find a version number for the old module then
367 -- bail out saying things aren't up to date
368 traceRn (sep [ptext SLIT("Can't find version number for module"),
369 pprModuleName mod_name])
370 `thenRn_` returnRn False ;
374 -- If the module version hasn't changed, just move on
375 if new_mod_vers == old_mod_vers then
376 traceRn (sep [ptext SLIT("Module version unchanged:"), pprModuleName mod_name])
377 `thenRn_` checkModUsage rest
379 traceRn (sep [ptext SLIT("Module version has changed:"), pprModuleName mod_name])
381 -- Module version changed, so check entities inside
383 -- If the usage info wants to say "I imported everything from this module"
384 -- it does so by making whats_imported equal to Everything
385 -- In that case, we must recompile
386 case whats_imported of {
387 Everything -> traceRn (ptext SLIT("...and I needed the whole module")) `thenRn_`
388 returnRn False; -- Bale out
390 Specifically old_local_vers ->
392 -- Non-empty usage list, so check item by item
393 checkEntityUsage mod_name (iDecls ifaces) old_local_vers `thenRn` \ up_to_date ->
395 traceRn (ptext SLIT("...but the bits I use haven't.")) `thenRn_`
396 checkModUsage rest -- This one's ok, so check the rest
398 returnRn False -- This one failed, so just bail out now
401 doc_str = sep [ptext SLIT("need version info for"), pprModuleName mod_name]
404 checkEntityUsage mod decls []
405 = returnRn True -- Yes! All up to date!
407 checkEntityUsage mod decls ((occ_name,old_vers) : rest)
408 = mkImportedGlobalName mod occ_name `thenRn` \ name ->
409 case lookupNameEnv decls name of
411 Nothing -> -- We used it before, but it ain't there now
412 putDocRn (sep [ptext SLIT("No longer exported:"), ppr name])
413 `thenRn_` returnRn False
415 Just (new_vers,_,_,_) -- It's there, but is it up to date?
416 | new_vers == old_vers
417 -- Up to date, so check the rest
418 -> checkEntityUsage mod decls rest
421 -- Out of date, so bale out
422 -> putDocRn (sep [ptext SLIT("Out of date:"), ppr name]) `thenRn_`
427 %*********************************************************
429 \subsection{Getting in a declaration}
431 %*********************************************************
434 importDecl :: Name -> RnMG (Maybe (Module, RdrNameHsDecl))
435 -- Returns Nothing for
438 -- (c) already slurped
444 = getSlurped `thenRn` \ already_slurped ->
445 if name `elemNameSet` already_slurped then
446 returnRn Nothing -- Already dealt with
448 getModuleRn `thenRn` \ this_mod ->
450 mod = moduleName (nameModule name)
452 if mod == this_mod then -- Don't bring in decls from
453 -- the renamed module's own interface file
454 addWarnRn (importDeclWarn mod name) `thenRn_`
457 getNonWiredInDecl name
461 getNonWiredInDecl :: Name -> RnMG (Maybe (Module, RdrNameHsDecl))
462 getNonWiredInDecl needed_name
463 = traceRn doc_str `thenRn_`
464 loadHomeInterface doc_str needed_name `thenRn` \ (_, ifaces) ->
465 case lookupNameEnv (iDecls ifaces) needed_name of
467 Just (version,avail,_,decl)
468 -> recordSlurp (Just version) avail `thenRn_`
471 Nothing -- Can happen legitimately for "Optional" occurrences
472 -> addErrRn (getDeclErr needed_name) `thenRn_`
475 doc_str = ptext SLIT("need decl for") <+> ppr needed_name
478 @getWiredInDecl@ maps a wired-in @Name@ to what it makes available.
479 It behaves exactly as if the wired in decl were actually in an interface file.
482 \item if the wired-in name is a data type constructor or a data constructor,
483 it brings in the type constructor and all the data constructors; and
484 marks as ``occurrences'' any free vars of the data con.
486 \item similarly for synonum type constructor
488 \item if the wired-in name is another wired-in Id, it marks as ``occurrences''
489 the free vars of the Id's type.
491 \item it loads the interface file for the wired-in thing for the
492 sole purpose of making sure that its instance declarations are available
494 All this is necessary so that we know all types that are ``in play'', so
495 that we know just what instances to bring into scope.
500 %*********************************************************
502 \subsection{Getting what a module exports}
504 %*********************************************************
506 @getInterfaceExports@ is called only for directly-imported modules.
509 getInterfaceExports :: ModuleName -> WhereFrom -> RnMG (Module, Avails)
510 getInterfaceExports mod_name from
511 = loadInterface doc_str mod_name from `thenRn` \ (mod, ifaces) ->
512 case lookupFM (iImpModInfo ifaces) mod_name of
513 Nothing -> -- Not there; it must be that the interface file wasn't found;
514 -- the error will have been reported already.
515 -- (Actually loadInterface should put the empty export env in there
516 -- anyway, but this does no harm.)
519 Just (_, _, Just (mod, _, avails)) -> returnRn (mod, avails)
521 doc_str = sep [pprModuleName mod_name, ptext SLIT("is directly imported")]
525 %*********************************************************
527 \subsection{Instance declarations are handled specially}
529 %*********************************************************
532 getImportedInstDecls :: NameSet -> RnMG [(Module,RdrNameHsDecl)]
533 getImportedInstDecls gates
534 = -- First load any orphan-instance modules that aren't aready loaded
535 -- Orphan-instance modules are recorded in the module dependecnies
536 getIfacesRn `thenRn` \ ifaces ->
539 [mod | (mod, (_, True, Nothing)) <- fmToList (iImpModInfo ifaces)]
541 traceRn (text "Loading orphan modules" <+> fsep (map pprModuleName orphan_mods))
542 `thenRn_` mapRn_ load_it orphan_mods `thenRn_`
544 -- Now we're ready to grab the instance declarations
545 -- Find the un-gated ones and return them,
546 -- removing them from the bag kept in Ifaces
547 getIfacesRn `thenRn` \ ifaces ->
549 (decls, new_insts) = selectGated gates (iInsts ifaces)
551 setIfacesRn (ifaces { iInsts = new_insts }) `thenRn_`
553 traceRn (sep [text "getImportedInstDecls:",
554 nest 4 (fsep (map ppr (nameSetToList gates))),
555 text "Slurped" <+> int (length decls)
556 <+> text "instance declarations"]) `thenRn_`
559 load_it mod = loadInterface (doc_str mod) mod ImportBySystem
560 doc_str mod = sep [pprModuleName mod, ptext SLIT("is a orphan-instance module")]
562 getImportedRules :: RnMG [(Module,RdrNameHsDecl)]
564 = getIfacesRn `thenRn` \ ifaces ->
566 gates = iSlurp ifaces -- Anything at all that's been slurped
567 (decls, new_rules) = selectGated gates (iRules ifaces)
569 setIfacesRn (ifaces { iRules = new_rules }) `thenRn_`
570 traceRn (sep [text "getImportedRules:",
571 text "Slurped" <+> int (length decls) <+> text "rules"]) `thenRn_`
574 selectGated gates decl_bag
576 | opt_NoPruneDecls -- Just to try the effect of not gating at all
577 = (foldrBag (\ (_,d) ds -> d:ds) [] decl_bag, emptyBag) -- Grab them all
581 = foldrBag select ([], emptyBag) decl_bag
583 select (reqd, decl) (yes, no)
584 | isEmptyNameSet (reqd `minusNameSet` gates) = (decl:yes, no)
585 | otherwise = (yes, (reqd,decl) `consBag` no)
587 lookupFixity :: Name -> RnMS Fixity
589 | isLocallyDefined name
590 = getFixityEnv `thenRn` \ local_fix_env ->
591 case lookupNameEnv local_fix_env name of
592 Just (FixitySig _ fix _) -> returnRn fix
593 Nothing -> returnRn defaultFixity
595 | otherwise -- Imported
596 = loadHomeInterface doc name `thenRn` \ (_, ifaces) ->
597 case lookupNameEnv (iFixes ifaces) name of
598 Just (FixitySig _ fix _) -> returnRn fix
599 Nothing -> returnRn defaultFixity
601 doc = ptext SLIT("Checking fixity for") <+> ppr name
605 %*********************************************************
607 \subsection{Keeping track of what we've slurped, and version numbers}
609 %*********************************************************
611 getImportVersions figures out
612 what the ``usage information'' for this moudule is;
613 that is, what it must record in its interface file as the things it uses.
616 \item anything reachable from its body code
617 \item any module exported with a @module Foo@.
620 Why the latter? Because if @Foo@ changes then this module's export list
621 will change, so we must recompile this module at least as far as
622 making a new interface file --- but in practice that means complete
627 module A( f, g ) where | module B( f ) where
628 import B( f ) | f = h 3
631 Should we record @B.f@ in @A@'s usages? In fact we don't. Certainly, if
632 anything about @B.f@ changes than anyone who imports @A@ should be recompiled;
633 they'll get an early exit if they don't use @B.f@. However, even if @B.f@
634 doesn't change at all, @B.h@ may do so, and this change may not be reflected
635 in @f@'s version number. So there are two things going on when compiling module @A@:
637 \item Are @A.o@ and @A.hi@ correct? Then we can bale out early.
638 \item Should modules that import @A@ be recompiled?
640 For (1) it is slightly harmful to record @B.f@ in @A@'s usages,
641 because a change in @B.f@'s version will provoke full recompilation of @A@,
642 producing an identical @A.o@,
643 and @A.hi@ differing only in its usage-version of @B.f@
644 (which isn't used by any importer).
646 For (2), because of the tricky @B.h@ question above,
647 we ensure that @A.hi@ is touched
648 (even if identical to its previous version)
649 if A's recompilation was triggered by an imported @.hi@ file date change.
650 Given that, there's no need to record @B.f@ in @A@'s usages.
652 On the other hand, if @A@ exports @module B@,
653 then we {\em do} count @module B@ among @A@'s usages,
654 because we must recompile @A@ to ensure that @A.hi@ changes appropriately.
657 getImportVersions :: ModuleName -- Name of this module
658 -> Maybe [IE any] -- Export list for this module
659 -> RnMG (VersionInfo Name) -- Version info for these names
661 getImportVersions this_mod exports
662 = getIfacesRn `thenRn` \ ifaces ->
664 mod_map = iImpModInfo ifaces
665 imp_names = iVSlurp ifaces
667 -- mv_map groups together all the things imported from a particular module.
668 mv_map1, mv_map2 :: FiniteMap ModuleName (WhatsImported Name)
670 -- mv_map1 records all the modules that have a "module M"
671 -- in this module's export list with an "Everything"
672 mv_map1 = foldr add_mod emptyFM export_mods
674 -- mv_map2 adds the version numbers of things exported individually
675 mv_map2 = foldr add_mv mv_map1 imp_names
677 -- Build the result list by adding info for each module,
678 -- *omitting* (a) library modules
679 -- (b) source-imported modules
680 mk_version_info mod_name (version, has_orphans, cts) so_far
681 | omit cts = so_far -- Don't record usage info for this module
682 | otherwise = (mod_name, version, has_orphans, whats_imported) : so_far
684 whats_imported = case lookupFM mv_map2 mod_name of
686 Nothing -> Specifically []
688 omit (Just (mod, boot_import, _)) = isLibModule mod || boot_import
691 returnRn (foldFM mk_version_info [] mod_map)
693 export_mods = case exports of
695 Just es -> [mod | IEModuleContents mod <- es, mod /= this_mod]
697 add_mv v@(name, version) mv_map
698 = addToFM_C add_item mv_map mod (Specifically [v])
700 mod = moduleName (nameModule name)
702 add_item Everything _ = Everything
703 add_item (Specifically xs) _ = Specifically (v:xs)
705 add_mod mod mv_map = addToFM mv_map mod Everything
710 = getIfacesRn `thenRn` \ ifaces ->
711 returnRn (iSlurp ifaces)
713 recordSlurp maybe_version avail
714 = getIfacesRn `thenRn` \ ifaces@(Ifaces { iSlurp = slurped_names,
715 iVSlurp = imp_names }) ->
717 new_slurped_names = addAvailToNameSet slurped_names avail
719 new_imp_names = case maybe_version of
720 Just version -> (availName avail, version) : imp_names
723 setIfacesRn (ifaces { iSlurp = new_slurped_names,
724 iVSlurp = new_imp_names })
728 %*********************************************************
730 \subsection{Getting binders out of a declaration}
732 %*********************************************************
734 @getDeclBinders@ returns the names for a @RdrNameHsDecl@.
735 It's used for both source code (from @availsFromDecl@) and interface files
738 It doesn't deal with source-code specific things: @ValD@, @DefD@. They
739 are handled by the sourc-code specific stuff in @RnNames@.
742 getDeclBinders :: (RdrName -> SrcLoc -> RnM d Name) -- New-name function
744 -> RnM d (Maybe AvailInfo)
746 getDeclBinders new_name (TyClD (TyData _ _ tycon _ condecls _ _ src_loc))
747 = new_name tycon src_loc `thenRn` \ tycon_name ->
748 getConFieldNames new_name condecls `thenRn` \ sub_names ->
749 returnRn (Just (AvailTC tycon_name (tycon_name : nub sub_names)))
750 -- The "nub" is because getConFieldNames can legitimately return duplicates,
751 -- when a record declaration has the same field in multiple constructors
753 getDeclBinders new_name (TyClD (TySynonym tycon _ _ src_loc))
754 = new_name tycon src_loc `thenRn` \ tycon_name ->
755 returnRn (Just (AvailTC tycon_name [tycon_name]))
757 getDeclBinders new_name (TyClD (ClassDecl _ cname _ sigs _ _ _ _ _ src_loc))
758 = new_name cname src_loc `thenRn` \ class_name ->
760 -- Record the names for the class ops
762 -- just want class-op sigs
763 op_sigs = filter isClassOpSig sigs
765 mapRn (getClassOpNames new_name) op_sigs `thenRn` \ sub_names ->
767 returnRn (Just (AvailTC class_name (class_name : sub_names)))
769 getDeclBinders new_name (SigD (IfaceSig var ty prags src_loc))
770 = new_name var src_loc `thenRn` \ var_name ->
771 returnRn (Just (Avail var_name))
773 getDeclBinders new_name (FixD _) = returnRn Nothing
774 getDeclBinders new_name (ForD _) = returnRn Nothing
775 getDeclBinders new_name (DefD _) = returnRn Nothing
776 getDeclBinders new_name (InstD _) = returnRn Nothing
777 getDeclBinders new_name (RuleD _) = returnRn Nothing
780 getConFieldNames new_name (ConDecl con _ _ (RecCon fielddecls) src_loc : rest)
781 = mapRn (\n -> new_name n src_loc) (con:fields) `thenRn` \ cfs ->
782 getConFieldNames new_name rest `thenRn` \ ns ->
785 fields = concat (map fst fielddecls)
787 getConFieldNames new_name (ConDecl con _ _ condecl src_loc : rest)
788 = new_name con src_loc `thenRn` \ n ->
791 new_name f src_loc `thenRn` \ new_f ->
793 _ -> returnRn [n]) `thenRn` \ nn ->
794 getConFieldNames new_name rest `thenRn` \ ns ->
797 getConFieldNames new_name [] = returnRn []
799 getClassOpNames new_name (ClassOpSig op _ _ src_loc) = new_name op src_loc
802 @getDeclSysBinders@ gets the implicit binders introduced by a decl.
803 A the moment that's just the tycon and datacon that come with a class decl.
804 They aren't returned by @getDeclBinders@ because they aren't in scope;
805 but they {\em should} be put into the @DeclsMap@ of this module.
807 Note that this excludes the default-method names of a class decl,
808 and the dict fun of an instance decl, because both of these have
809 bindings of their own elsewhere.
812 getDeclSysBinders new_name (TyClD (ClassDecl _ cname _ sigs _ _ tname dname snames src_loc))
813 = new_name dname src_loc `thenRn` \ datacon_name ->
814 new_name tname src_loc `thenRn` \ tycon_name ->
815 sequenceRn [new_name n src_loc | n <- snames] `thenRn` \ scsel_names ->
816 returnRn (tycon_name : datacon_name : scsel_names)
818 getDeclSysBinders new_name other_decl
822 %*********************************************************
824 \subsection{Reading an interface file}
826 %*********************************************************
829 findAndReadIface :: SDoc -> ModuleName -> WhereFrom
830 -> Bool -- Only relevant for SystemImport
831 -- True <=> Look for a .hi file
832 -- False <=> Look for .hi-boot file unless there's
833 -- a library .hi file
834 -> RnM d (Bool, Maybe (Module, ParsedIface))
835 -- Bool is True if the interface actually read was a .hi-boot one
836 -- Nothing <=> file not found, or unreadable, or illegible
837 -- Just x <=> successfully found and parsed
839 findAndReadIface doc_str mod_name from hi_file
840 = traceRn trace_msg `thenRn_`
841 -- we keep two maps for interface files,
842 -- one for 'normal' ones, the other for .hi-boot files,
843 -- hence the need to signal which kind we're interested.
845 getHiMaps `thenRn` \ hi_maps ->
847 case find_path from hi_maps of
849 (hi_boot, Just (fpath, mod)) -> traceRn (ptext SLIT("...reading from") <+> text fpath)
851 readIface mod fpath `thenRn` \ result ->
852 returnRn (hi_boot, result)
853 (hi_boot, Nothing) -> traceRn (ptext SLIT("...not found")) `thenRn_`
854 returnRn (hi_boot, Nothing)
856 find_path ImportByUser (hi_map, _) = (False, lookupFM hi_map mod_name)
857 find_path ImportByUserSource (_, hiboot_map) = (True, lookupFM hiboot_map mod_name)
859 find_path ImportBySystem (hi_map, hiboot_map)
861 = -- If the module we seek is in our dependent set,
862 -- Look for a .hi file
863 (False, lookupFM hi_map mod_name)
866 -- Check if there's a library module of that name
867 -- If not, look for an hi-boot file
868 = case lookupFM hi_map mod_name of
869 stuff@(Just (_, mod)) | isLibModule mod -> (False, stuff)
870 other -> (True, lookupFM hiboot_map mod_name)
872 trace_msg = sep [hsep [ptext SLIT("Reading"),
874 ptext SLIT("interface for"),
875 pprModuleName mod_name <> semi],
876 nest 4 (ptext SLIT("reason:") <+> doc_str)]
879 @readIface@ tries just the one file.
882 readIface :: Module -> String -> RnM d (Maybe (Module, ParsedIface))
883 -- Nothing <=> file not found, or unreadable, or illegible
884 -- Just x <=> successfully found and parsed
885 readIface the_mod file_path
886 = ioToRnM (hGetStringBuffer False file_path) `thenRn` \ read_result ->
889 case parseIface contents
890 PState{ bol = 0#, atbol = 1#,
893 loc = mkSrcLoc (mkFastString file_path) 1 } of
894 PFailed err -> failWithRn Nothing err
895 POk _ (PIface mod_nm iface) ->
896 warnCheckRn (mod_nm == moduleName the_mod)
897 (hsep [ ptext SLIT("Something is amiss; requested module name")
899 , ptext SLIT("differs from name found in the interface file ")
900 , pprModuleName mod_nm
902 `thenRn_` returnRn (Just (the_mod, iface))
905 | isDoesNotExistError err -> returnRn Nothing
906 | otherwise -> failWithRn Nothing (cannaeReadFile file_path err)
909 %*********************************************************
913 %*********************************************************
916 noIfaceErr filename boot_file
917 = hsep [ptext SLIT("Could not find valid"), boot,
918 ptext SLIT("interface file"), quotes (pprModule filename)]
920 boot | boot_file = ptext SLIT("[boot]")
923 cannaeReadFile file err
924 = hcat [ptext SLIT("Failed in reading file: "),
926 ptext SLIT("; error="),
930 = ptext SLIT("Failed to find interface decl for") <+> quotes (ppr name)
933 = sep [ptext SLIT("Failed to find (optional) interface decl for") <+> quotes (ppr name),
934 ptext SLIT("desired at") <+> ppr loc]
936 importDeclWarn mod name
938 "Compiler tried to import decl from interface file with same name as module."),
940 "(possible cause: module name clashes with interface file already in scope.)")
942 hsep [ptext SLIT("Interface:"), quotes (pprModuleName mod),
943 comma, ptext SLIT("name:"), quotes (ppr name)]
945 warnRedundantSourceImport mod_name
946 = ptext SLIT("Unnecessary {- SOURCE -} in the import of module")
947 <+> quotes (pprModuleName mod_name)