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,
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 )
69 import IO ( isDoesNotExistError )
74 %*********************************************************
76 \subsection{Loading a new interface file}
78 %*********************************************************
81 loadHomeInterface :: SDoc -> Name -> RnM d (Module, Ifaces)
82 loadHomeInterface doc_str name
83 = loadInterface doc_str (moduleName (nameModule name)) ImportBySystem
85 loadInterface :: SDoc -> ModuleName -> WhereFrom -> RnM d (Module, Ifaces)
86 loadInterface doc_str mod_name from
87 = getIfacesRn `thenRn` \ ifaces ->
89 mod_map = iImpModInfo ifaces
90 mod_info = lookupFM mod_map mod_name
91 in_map = maybeToBool mod_info
94 -- Issue a warning for a redundant {- SOURCE -} import
95 -- It's redundant if the moduld is in the iImpModInfo at all,
96 -- because we arrange to read all the ordinary imports before
97 -- any of the {- SOURCE -} imports
98 warnCheckRn (not (in_map && case from of {ImportByUserSource -> True; other -> False}))
99 (warnRedundantSourceImport mod_name) `thenRn_`
101 -- CHECK WHETHER WE HAVE IT ALREADY
103 Just (_, _, Just (load_mod, _, _))
104 -> -- We're read it already so don't re-read it
105 returnRn (load_mod, ifaces) ;
109 -- READ THE MODULE IN
110 findAndReadIface doc_str mod_name from in_map `thenRn` \ (hi_boot_read, read_result) ->
111 case read_result of {
112 Nothing -> -- Not found, so add an empty export env to the Ifaces map
113 -- so that we don't look again
115 mod = mkVanillaModule mod_name
116 new_mod_map = addToFM mod_map mod_name (0, False, Just (mod, False, []))
117 new_ifaces = ifaces { iImpModInfo = new_mod_map }
119 setIfacesRn new_ifaces `thenRn_`
120 failWithRn (mod, new_ifaces) (noIfaceErr mod hi_boot_read) ;
125 -- LOAD IT INTO Ifaces
127 -- NB: *first* we do loadDecl, so that the provenance of all the locally-defined
128 --- names is done correctly (notably, whether this is an .hi file or .hi-boot file).
129 -- If we do loadExport first the wrong info gets into the cache (unless we
130 -- explicitly tag each export which seems a bit of a bore)
132 getModuleRn `thenRn` \ this_mod_nm ->
134 rd_decls = pi_decls iface
136 foldlRn (loadDecl mod) (iDecls ifaces) rd_decls `thenRn` \ new_decls ->
137 foldlRn (loadInstDecl mod) (iInsts ifaces) (pi_insts iface) `thenRn` \ new_insts ->
138 foldlRn (loadRule mod) (iRules ifaces) (pi_rules iface) `thenRn` \ new_rules ->
139 foldlRn (loadFixDecl mod_name) (iFixes ifaces) rd_decls `thenRn` \ new_fixities ->
140 mapRn (loadExport this_mod_nm) (pi_exports iface) `thenRn` \ avails_s ->
142 -- For an explicit user import, add to mod_map info about
143 -- the things the imported module depends on, extracted
144 -- from its usage info.
145 mod_map1 = case from of
146 ImportByUser -> addModDeps mod mod_map (pi_usages iface)
149 -- Now add info about this module
150 mod_map2 = addToFM mod_map1 mod_name mod_details
151 mod_details = (pi_mod iface, pi_orphan iface, Just (mod, hi_boot_read, concat avails_s))
153 new_ifaces = ifaces { iImpModInfo = mod_map2,
155 iFixes = new_fixities,
159 setIfacesRn new_ifaces `thenRn_`
160 returnRn (mod, new_ifaces)
163 addModDeps :: Module -> ImportedModuleInfo
164 -> [ImportVersion a] -> ImportedModuleInfo
165 addModDeps mod mod_deps new_deps
166 = foldr add mod_deps new_deps
168 is_lib = isLibModule mod -- Don't record dependencies when importing a library module
169 add (imp_mod, version, has_orphans, _) deps
170 | is_lib && not has_orphans = deps
171 | otherwise = addToFM_C combine deps imp_mod (version, has_orphans, Nothing)
172 -- Record dependencies for modules that are
173 -- either are dependent via a non-library module
174 -- or contain orphan rules or instance decls
176 -- Don't ditch a module that's already loaded!!
177 combine old@(_, _, Just _) new = old
178 combine old@(_, _, Nothing) new = new
180 loadExport :: ModuleName -> ExportItem -> RnM d [AvailInfo]
181 loadExport this_mod (mod, entities)
182 | mod == this_mod = returnRn []
183 -- If the module exports anything defined in this module, just ignore it.
184 -- Reason: otherwise it looks as if there are two local definition sites
185 -- for the thing, and an error gets reported. Easiest thing is just to
186 -- filter them out up front. This situation only arises if a module
187 -- imports itself, or another module that imported it. (Necessarily,
188 -- this invoves a loop.) Consequence: if you say
193 -- module B( AType ) where
194 -- import {-# SOURCE #-} A( AType )
196 -- then you'll get a 'B does not export AType' message. A bit bogus
197 -- but it's a bogus thing to do!
200 = mapRn (load_entity mod) entities
202 new_name mod occ = mkImportedGlobalName mod occ
204 load_entity mod (Avail occ)
205 = new_name mod occ `thenRn` \ name ->
206 returnRn (Avail name)
207 load_entity mod (AvailTC occ occs)
208 = new_name mod occ `thenRn` \ name ->
209 mapRn (new_name mod) occs `thenRn` \ names ->
210 returnRn (AvailTC name names)
213 loadFixDecl :: ModuleName -> FixityEnv
214 -> (Version, RdrNameHsDecl)
216 loadFixDecl mod_name fixity_env (version, FixD sig@(FixitySig rdr_name fixity loc))
217 = -- Ignore the version; when the fixity changes the version of
218 -- its 'host' entity changes, so we don't need a separate version
219 -- number for fixities
220 mkImportedGlobalName mod_name (rdrNameOcc rdr_name) `thenRn` \ name ->
222 new_fixity_env = addToNameEnv fixity_env name (FixitySig name fixity loc)
224 returnRn new_fixity_env
226 -- Ignore the other sorts of decl
227 loadFixDecl mod_name fixity_env other_decl = returnRn fixity_env
231 -> (Version, RdrNameHsDecl)
234 loadDecl mod decls_map (version, decl)
235 = getDeclBinders new_name decl `thenRn` \ maybe_avail ->
236 case maybe_avail of {
237 Nothing -> returnRn decls_map; -- No bindings
240 getDeclSysBinders new_name decl `thenRn` \ sys_bndrs ->
242 main_name = availName avail
243 new_decls_map = foldl add_decl decls_map
244 [ (name, (version, avail, name==main_name, (mod, decl')))
245 | name <- sys_bndrs ++ availNames avail]
246 add_decl decls_map (name, stuff)
247 = WARN( name `elemNameEnv` decls_map, ppr name )
248 addToNameEnv decls_map name stuff
250 returnRn new_decls_map
253 -- newImportedBinder puts into the cache the binder with the
254 -- module information set correctly. When the decl is later renamed,
255 -- the binding site will thereby get the correct module.
256 new_name rdr_name loc = newImportedBinder mod rdr_name
259 If a signature decl is being loaded, and optIgnoreIfacePragmas is on,
260 we toss away unfolding information.
262 Also, if the signature is loaded from a module we're importing from source,
263 we do the same. This is to avoid situations when compiling a pair of mutually
264 recursive modules, peering at unfolding info in the interface file of the other,
265 e.g., you compile A, it looks at B's interface file and may as a result change
266 its interface file. Hence, B is recompiled, maybe changing its interface file,
267 which will the unfolding info used in A to become invalid. Simple way out is to
268 just ignore unfolding info.
270 [Jan 99: I junked the second test above. If we're importing from an hi-boot
271 file there isn't going to *be* any pragma info. Maybe the above comment
272 dates from a time where we picked up a .hi file first if it existed?]
275 SigD (IfaceSig name tp ls loc) | opt_IgnoreIfacePragmas -> SigD (IfaceSig name tp [] loc)
278 loadInstDecl :: Module
281 -> RnM d (Bag GatedDecl)
282 loadInstDecl mod insts decl@(InstDecl inst_ty binds uprags dfun_name src_loc)
284 -- Find out what type constructors and classes are "gates" for the
285 -- instance declaration. If all these "gates" are slurped in then
286 -- we should slurp the instance decl too.
288 -- We *don't* want to count names in the context part as gates, though.
290 -- instance Foo a => Baz (T a) where ...
292 -- Here the gates are Baz and T, but *not* Foo.
294 munged_inst_ty = removeContext inst_ty
295 free_names = extractHsTyRdrNames munged_inst_ty
297 setModuleRn (moduleName mod) $
298 mapRn mkImportedGlobalFromRdrName free_names `thenRn` \ gate_names ->
299 returnRn ((mkNameSet gate_names, (mod, InstD decl)) `consBag` insts)
302 -- In interface files, the instance decls now look like
303 -- forall a. Foo a -> Baz (T a)
304 -- so we have to strip off function argument types as well
305 -- as the bit before the '=>' (which is always empty in interface files)
306 removeContext (HsForAllTy tvs cxt ty) = HsForAllTy tvs [] (removeFuns ty)
307 removeContext ty = removeFuns ty
309 removeFuns (MonoFunTy _ ty) = removeFuns ty
313 loadRule :: Module -> Bag GatedDecl
314 -> RdrNameRuleDecl -> RnM d (Bag GatedDecl)
315 -- "Gate" the rule simply by whether the rule variable is
316 -- needed. We can refine this later.
317 loadRule mod rules decl@(IfaceRuleDecl var body src_loc)
318 = setModuleRn (moduleName mod) $
319 mkImportedGlobalFromRdrName var `thenRn` \ var_name ->
320 returnRn ((unitNameSet var_name, (mod, RuleD decl)) `consBag` rules)
324 %********************************************************
326 \subsection{Loading usage information}
328 %********************************************************
331 checkUpToDate :: ModuleName -> RnMG Bool -- True <=> no need to recompile
332 checkUpToDate mod_name
333 = getIfacesRn `thenRn` \ ifaces ->
334 findAndReadIface doc_str mod_name
336 (error "checkUpToDate") `thenRn` \ (_, read_result) ->
338 -- CHECK WHETHER WE HAVE IT ALREADY
340 Nothing -> -- Old interface file not found, so we'd better bail out
341 traceRn (sep [ptext SLIT("Didnt find old iface"),
342 pprModuleName mod_name]) `thenRn_`
346 -> -- Found it, so now check it
347 checkModUsage (pi_usages iface)
349 -- Only look in current directory, with suffix .hi
350 doc_str = sep [ptext SLIT("need usage info from"), pprModuleName mod_name]
352 checkModUsage [] = returnRn True -- Yes! Everything is up to date!
354 checkModUsage ((mod_name, old_mod_vers, _, whats_imported) : rest)
355 = loadInterface doc_str mod_name ImportBySystem `thenRn` \ (mod, ifaces) ->
357 maybe_mod_vers = case lookupFM (iImpModInfo ifaces) mod_name of
358 Just (version, _, Just (_, _, _)) -> Just version
361 case maybe_mod_vers of {
362 Nothing -> -- If we can't find a version number for the old module then
363 -- bail out saying things aren't up to date
364 traceRn (sep [ptext SLIT("Can't find version number for module"),
365 pprModuleName mod_name]) `thenRn_`
370 -- If the module version hasn't changed, just move on
371 if new_mod_vers == old_mod_vers then
372 traceRn (sep [ptext SLIT("Module version unchanged:"), pprModuleName mod_name]) `thenRn_`
375 traceRn (sep [ptext SLIT("Module version has changed:"), pprModuleName mod_name]) `thenRn_`
377 -- Module version changed, so check entities inside
379 -- If the usage info wants to say "I imported everything from this module"
380 -- it does so by making whats_imported equal to Everything
381 -- In that case, we must recompile
382 case whats_imported of {
383 Everything -> traceRn (ptext SLIT("...and I needed the whole module")) `thenRn_`
384 returnRn False; -- Bale out
386 Specifically old_local_vers ->
388 -- Non-empty usage list, so check item by item
389 checkEntityUsage mod_name (iDecls ifaces) old_local_vers `thenRn` \ up_to_date ->
391 traceRn (ptext SLIT("...but the bits I use haven't.")) `thenRn_`
392 checkModUsage rest -- This one's ok, so check the rest
394 returnRn False -- This one failed, so just bail out now
397 doc_str = sep [ptext SLIT("need version info for"), pprModuleName mod_name]
400 checkEntityUsage mod decls []
401 = returnRn True -- Yes! All up to date!
403 checkEntityUsage mod decls ((occ_name,old_vers) : rest)
404 = mkImportedGlobalName mod occ_name `thenRn` \ name ->
405 case lookupNameEnv decls name of
407 Nothing -> -- We used it before, but it ain't there now
408 putDocRn (sep [ptext SLIT("No longer exported:"), ppr name]) `thenRn_`
411 Just (new_vers,_,_,_) -- It's there, but is it up to date?
412 | new_vers == old_vers
413 -- Up to date, so check the rest
414 -> checkEntityUsage mod decls rest
417 -- Out of date, so bale out
418 -> putDocRn (sep [ptext SLIT("Out of date:"), ppr name]) `thenRn_`
423 %*********************************************************
425 \subsection{Getting in a declaration}
427 %*********************************************************
430 importDecl :: Name -> RnMG (Maybe (Module, RdrNameHsDecl))
431 -- Returns Nothing for
434 -- (c) already slurped
440 = getSlurped `thenRn` \ already_slurped ->
441 if name `elemNameSet` already_slurped then
442 returnRn Nothing -- Already dealt with
444 getModuleRn `thenRn` \ this_mod ->
446 mod = moduleName (nameModule name)
448 if mod == this_mod then -- Don't bring in decls from
449 -- the renamed module's own interface file
450 addWarnRn (importDeclWarn mod name) `thenRn_`
453 getNonWiredInDecl name
457 getNonWiredInDecl :: Name -> RnMG (Maybe (Module, RdrNameHsDecl))
458 getNonWiredInDecl needed_name
459 = traceRn doc_str `thenRn_`
460 loadHomeInterface doc_str needed_name `thenRn` \ (_, ifaces) ->
461 case lookupNameEnv (iDecls ifaces) needed_name of
463 Just (version,avail,_,decl)
464 -> recordSlurp (Just version) avail `thenRn_`
467 Nothing -- Can happen legitimately for "Optional" occurrences
468 -> addErrRn (getDeclErr needed_name) `thenRn_`
471 doc_str = ptext SLIT("need decl for") <+> ppr needed_name
474 @getWiredInDecl@ maps a wired-in @Name@ to what it makes available.
475 It behaves exactly as if the wired in decl were actually in an interface file.
478 * if the wired-in name is a data type constructor or a data constructor,
479 it brings in the type constructor and all the data constructors; and
480 marks as "occurrences" any free vars of the data con.
482 * similarly for synonum type constructor
484 * if the wired-in name is another wired-in Id, it marks as "occurrences"
485 the free vars of the Id's type.
487 * it loads the interface file for the wired-in thing for the
488 sole purpose of making sure that its instance declarations are available
490 All this is necessary so that we know all types that are "in play", so
491 that we know just what instances to bring into scope.
496 %*********************************************************
498 \subsection{Getting what a module exports}
500 %*********************************************************
502 @getInterfaceExports@ is called only for directly-imported modules
505 getInterfaceExports :: ModuleName -> WhereFrom -> RnMG (Module, Avails)
506 getInterfaceExports mod_name from
507 = loadInterface doc_str mod_name from `thenRn` \ (mod, ifaces) ->
508 case lookupFM (iImpModInfo ifaces) mod_name of
509 Nothing -> -- Not there; it must be that the interface file wasn't found;
510 -- the error will have been reported already.
511 -- (Actually loadInterface should put the empty export env in there
512 -- anyway, but this does no harm.)
515 Just (_, _, Just (mod, _, avails)) -> returnRn (mod, avails)
517 doc_str = sep [pprModuleName mod_name, ptext SLIT("is directly imported")]
521 %*********************************************************
523 \subsection{Instance declarations are handled specially}
525 %*********************************************************
528 getImportedInstDecls :: NameSet -> RnMG [(Module,RdrNameHsDecl)]
529 getImportedInstDecls gates
530 = -- First load any orphan-instance modules that aren't aready loaded
531 -- Orphan-instance modules are recorded in the module dependecnies
532 getIfacesRn `thenRn` \ ifaces ->
534 orphan_mods = [mod | (mod, (_, True, Nothing)) <- fmToList (iImpModInfo ifaces)]
536 traceRn (text "Loading orphan modules" <+> fsep (map pprModuleName orphan_mods)) `thenRn_`
537 mapRn_ load_it orphan_mods `thenRn_`
539 -- Now we're ready to grab the instance declarations
540 -- Find the un-gated ones and return them,
541 -- removing them from the bag kept in Ifaces
542 getIfacesRn `thenRn` \ ifaces ->
544 (decls, new_insts) = selectGated gates (iInsts ifaces)
546 setIfacesRn (ifaces { iInsts = new_insts }) `thenRn_`
548 traceRn (sep [text "getImportedInstDecls:",
549 nest 4 (fsep (map ppr (nameSetToList gates))),
550 text "Slurped" <+> int (length decls) <+> text "instance declarations"]) `thenRn_`
553 load_it mod = loadInterface (doc_str mod) mod ImportBySystem
554 doc_str mod = sep [pprModuleName mod, ptext SLIT("is a orphan-instance module")]
556 getImportedRules :: RnMG [(Module,RdrNameHsDecl)]
558 = getIfacesRn `thenRn` \ ifaces ->
560 gates = iSlurp ifaces -- Anything at all that's been slurped
561 (decls, new_rules) = selectGated gates (iRules ifaces)
563 setIfacesRn (ifaces { iRules = new_rules }) `thenRn_`
564 traceRn (sep [text "getImportedRules:",
565 text "Slurped" <+> int (length decls) <+> text "rules"]) `thenRn_`
568 selectGated gates decl_bag
570 | opt_NoPruneDecls -- Just to try the effect of not gating at all
571 = (foldrBag (\ (_,d) ds -> d:ds) [] decl_bag, emptyBag) -- Grab them all
575 = foldrBag select ([], emptyBag) decl_bag
577 select (reqd, decl) (yes, no)
578 | isEmptyNameSet (reqd `minusNameSet` gates) = (decl:yes, no)
579 | otherwise = (yes, (reqd,decl) `consBag` no)
581 lookupFixity :: Name -> RnMS Fixity
583 | isLocallyDefined name
584 = getFixityEnv `thenRn` \ local_fix_env ->
585 case lookupNameEnv local_fix_env name of
586 Just (FixitySig _ fix _) -> returnRn fix
587 Nothing -> returnRn defaultFixity
589 | otherwise -- Imported
590 = loadHomeInterface doc name `thenRn` \ (_, ifaces) ->
591 case lookupNameEnv (iFixes ifaces) name of
592 Just (FixitySig _ fix _) -> returnRn fix
593 Nothing -> returnRn defaultFixity
595 doc = ptext SLIT("Checking fixity for") <+> ppr name
599 %*********************************************************
601 \subsection{Keeping track of what we've slurped, and version numbers}
603 %*********************************************************
605 getImportVersions figures out what the "usage information" for this moudule is;
606 that is, what it must record in its interface file as the things it uses.
608 - anything reachable from its body code
609 - any module exported with a "module Foo".
611 Why the latter? Because if Foo changes then this module's export list
612 will change, so we must recompile this module at least as far as
613 making a new interface file --- but in practice that means complete
617 module A( f, g ) where module B( f ) where
618 import B( f ) f = h 3
621 Should we record B.f in A's usages? In fact we don't. Certainly, if
622 anything about B.f changes than anyone who imports A should be recompiled;
623 they'll get an early exit if they don't use B.f. However, even if B.f
624 doesn't change at all, B.h may do so, and this change may not be reflected
625 in f's version number. So there are two things going on when compiling module A:
627 1. Are A.o and A.hi correct? Then we can bale out early.
628 2. Should modules that import A be recompiled?
630 For (1) it is slightly harmful to record B.f in A's usages, because a change in
631 B.f's version will provoke full recompilation of A, producing an identical A.o,
632 and A.hi differing only in its usage-version of B.f (which isn't used by any importer).
634 For (2), because of the tricky B.h question above, we ensure that A.hi is touched
635 (even if identical to its previous version) if A's recompilation was triggered by
636 an imported .hi file date change. Given that, there's no need to record B.f in
639 On the other hand, if A exports "module B" then we *do* count module B among
640 A's usages, because we must recompile A to ensure that A.hi changes appropriately.
643 getImportVersions :: ModuleName -- Name of this module
644 -> Maybe [IE any] -- Export list for this module
645 -> RnMG (VersionInfo Name) -- Version info for these names
647 getImportVersions this_mod exports
648 = getIfacesRn `thenRn` \ ifaces ->
650 mod_map = iImpModInfo ifaces
651 imp_names = iVSlurp ifaces
653 -- mv_map groups together all the things imported from a particular module.
654 mv_map1, mv_map2 :: FiniteMap ModuleName (WhatsImported Name)
656 -- mv_map1 records all the modules that have a "module M"
657 -- in this module's export list with an "Everything"
658 mv_map1 = foldr add_mod emptyFM export_mods
660 -- mv_map2 adds the version numbers of things exported individually
661 mv_map2 = foldr add_mv mv_map1 imp_names
663 -- Build the result list by adding info for each module,
664 -- *omitting* (a) library modules
665 -- (b) source-imported modules
666 mk_version_info mod_name (version, has_orphans, cts) so_far
667 | omit cts = so_far -- Don't record usage info for this module
668 | otherwise = (mod_name, version, has_orphans, whats_imported) : so_far
670 whats_imported = case lookupFM mv_map2 mod_name of
672 Nothing -> Specifically []
674 omit (Just (mod, boot_import, _)) = isLibModule mod || boot_import
677 returnRn (foldFM mk_version_info [] mod_map)
679 export_mods = case exports of
681 Just es -> [mod | IEModuleContents mod <- es, mod /= this_mod]
683 add_mv v@(name, version) mv_map
684 = addToFM_C add_item mv_map mod (Specifically [v])
686 mod = moduleName (nameModule name)
688 add_item Everything _ = Everything
689 add_item (Specifically xs) _ = Specifically (v:xs)
691 add_mod mod mv_map = addToFM mv_map mod Everything
696 = getIfacesRn `thenRn` \ ifaces ->
697 returnRn (iSlurp ifaces)
699 recordSlurp maybe_version avail
700 = getIfacesRn `thenRn` \ ifaces@(Ifaces { iSlurp = slurped_names,
701 iVSlurp = imp_names }) ->
703 new_slurped_names = addAvailToNameSet slurped_names avail
705 new_imp_names = case maybe_version of
706 Just version -> (availName avail, version) : imp_names
709 setIfacesRn (ifaces { iSlurp = new_slurped_names,
710 iVSlurp = new_imp_names })
714 %*********************************************************
716 \subsection{Getting binders out of a declaration}
718 %*********************************************************
720 @getDeclBinders@ returns the names for a @RdrNameHsDecl@.
721 It's used for both source code (from @availsFromDecl@) and interface files
724 It doesn't deal with source-code specific things: ValD, DefD. They
725 are handled by the sourc-code specific stuff in RnNames.
728 getDeclBinders :: (RdrName -> SrcLoc -> RnM d Name) -- New-name function
730 -> RnM d (Maybe AvailInfo)
732 getDeclBinders new_name (TyClD (TyData _ _ tycon _ condecls _ _ src_loc))
733 = new_name tycon src_loc `thenRn` \ tycon_name ->
734 getConFieldNames new_name condecls `thenRn` \ sub_names ->
735 returnRn (Just (AvailTC tycon_name (tycon_name : nub sub_names)))
736 -- The "nub" is because getConFieldNames can legitimately return duplicates,
737 -- when a record declaration has the same field in multiple constructors
739 getDeclBinders new_name (TyClD (TySynonym tycon _ _ src_loc))
740 = new_name tycon src_loc `thenRn` \ tycon_name ->
741 returnRn (Just (AvailTC tycon_name [tycon_name]))
743 getDeclBinders new_name (TyClD (ClassDecl _ cname _ sigs _ _ _ _ _ src_loc))
744 = new_name cname src_loc `thenRn` \ class_name ->
746 -- Record the names for the class ops
748 -- just want class-op sigs
749 op_sigs = filter isClassOpSig sigs
751 mapRn (getClassOpNames new_name) op_sigs `thenRn` \ sub_names ->
753 returnRn (Just (AvailTC class_name (class_name : sub_names)))
755 getDeclBinders new_name (SigD (IfaceSig var ty prags src_loc))
756 = new_name var src_loc `thenRn` \ var_name ->
757 returnRn (Just (Avail var_name))
759 getDeclBinders new_name (FixD _) = returnRn Nothing
760 getDeclBinders new_name (ForD _) = returnRn Nothing
761 getDeclBinders new_name (DefD _) = returnRn Nothing
762 getDeclBinders new_name (InstD _) = returnRn Nothing
763 getDeclBinders new_name (RuleD _) = returnRn Nothing
766 getConFieldNames new_name (ConDecl con _ _ (RecCon fielddecls) src_loc : rest)
767 = mapRn (\n -> new_name n src_loc) (con:fields) `thenRn` \ cfs ->
768 getConFieldNames new_name rest `thenRn` \ ns ->
771 fields = concat (map fst fielddecls)
773 getConFieldNames new_name (ConDecl con _ _ condecl src_loc : rest)
774 = new_name con src_loc `thenRn` \ n ->
777 new_name f src_loc `thenRn` \ new_f ->
779 _ -> returnRn [n]) `thenRn` \ nn ->
780 getConFieldNames new_name rest `thenRn` \ ns ->
783 getConFieldNames new_name [] = returnRn []
785 getClassOpNames new_name (ClassOpSig op _ _ src_loc) = new_name op src_loc
788 @getDeclSysBinders@ gets the implicit binders introduced by a decl.
789 A the moment that's just the tycon and datacon that come with a class decl.
790 They aren'te returned by getDeclBinders because they aren't in scope;
791 but they *should* be put into the DeclsMap of this module.
793 Note that this excludes the default-method names of a class decl,
794 and the dict fun of an instance decl, because both of these have
795 bindings of their own elsewhere.
798 getDeclSysBinders new_name (TyClD (ClassDecl _ cname _ sigs _ _ tname dname snames src_loc))
799 = new_name dname src_loc `thenRn` \ datacon_name ->
800 new_name tname src_loc `thenRn` \ tycon_name ->
801 sequenceRn [new_name n src_loc | n <- snames] `thenRn` \ scsel_names ->
802 returnRn (tycon_name : datacon_name : scsel_names)
804 getDeclSysBinders new_name other_decl
808 %*********************************************************
810 \subsection{Reading an interface file}
812 %*********************************************************
815 findAndReadIface :: SDoc -> ModuleName -> WhereFrom
816 -> Bool -- Only relevant for SystemImport
817 -- True <=> Look for a .hi file
818 -- False <=> Look for .hi-boot file unless there's
819 -- a library .hi file
820 -> RnM d (Bool, Maybe (Module, ParsedIface))
821 -- Bool is True if the interface actually read was a .hi-boot one
822 -- Nothing <=> file not found, or unreadable, or illegible
823 -- Just x <=> successfully found and parsed
825 findAndReadIface doc_str mod_name from hi_file
826 = traceRn trace_msg `thenRn_`
827 -- we keep two maps for interface files,
828 -- one for 'normal' ones, the other for .hi-boot files,
829 -- hence the need to signal which kind we're interested.
831 getHiMaps `thenRn` \ hi_maps ->
833 case find_path from hi_maps of
835 (hi_boot, Just (fpath, mod)) -> traceRn (ptext SLIT("...reading from") <+> text fpath) `thenRn_`
836 readIface mod fpath `thenRn` \ result ->
837 returnRn (hi_boot, result)
838 (hi_boot, Nothing) -> traceRn (ptext SLIT("...not found")) `thenRn_`
839 returnRn (hi_boot, Nothing)
841 find_path ImportByUser (hi_map, _) = (False, lookupFM hi_map mod_name)
842 find_path ImportByUserSource (_, hiboot_map) = (True, lookupFM hiboot_map mod_name)
844 find_path ImportBySystem (hi_map, hiboot_map)
846 = -- If the module we seek is in our dependent set,
847 -- Look for a .hi file
848 (False, lookupFM hi_map mod_name)
851 -- Check if there's a library module of that name
852 -- If not, look for an hi-boot file
853 = case lookupFM hi_map mod_name of
854 stuff@(Just (_, mod)) | isLibModule mod -> (False, stuff)
855 other -> (True, lookupFM hiboot_map mod_name)
857 trace_msg = sep [hsep [ptext SLIT("Reading"),
859 ptext SLIT("interface for"),
860 pprModuleName mod_name <> semi],
861 nest 4 (ptext SLIT("reason:") <+> doc_str)]
864 @readIface@ tries just the one file.
867 readIface :: Module -> String -> RnM d (Maybe (Module, ParsedIface))
868 -- Nothing <=> file not found, or unreadable, or illegible
869 -- Just x <=> successfully found and parsed
870 readIface the_mod file_path
871 = ioToRnM (hGetStringBuffer file_path) `thenRn` \ read_result ->
874 case parseIface contents (mkSrcLoc (mkFastString file_path) 1) of
875 Failed err -> failWithRn Nothing err
876 Succeeded (PIface mod_nm iface) ->
877 warnCheckRn (mod_nm == moduleName the_mod)
878 (hsep [ ptext SLIT("Something is amiss; requested module name")
880 , ptext SLIT("differs from name found in the interface file ")
881 , pprModuleName mod_nm
883 returnRn (Just (the_mod, iface))
886 | isDoesNotExistError err -> returnRn Nothing
887 | otherwise -> failWithRn Nothing (cannaeReadFile file_path err)
890 %*********************************************************
894 %*********************************************************
897 noIfaceErr filename boot_file
898 = hsep [ptext SLIT("Could not find valid"), boot,
899 ptext SLIT("interface file"), quotes (pprModule filename)]
901 boot | boot_file = ptext SLIT("[boot]")
904 cannaeReadFile file err
905 = hcat [ptext SLIT("Failed in reading file: "),
907 ptext SLIT("; error="),
911 = ptext SLIT("Failed to find interface decl for") <+> quotes (ppr name)
914 = sep [ptext SLIT("Failed to find (optional) interface decl for") <+> quotes (ppr name),
915 ptext SLIT("desired at") <+> ppr loc]
917 importDeclWarn mod name
918 = sep [ptext SLIT("Compiler tried to import decl from interface file with same name as module."),
919 ptext SLIT("(possible cause: module name clashes with interface file already in scope.)")
921 hsep [ptext SLIT("Interface:"), quotes (pprModuleName mod),
922 comma, ptext SLIT("name:"), quotes (ppr name)]
924 warnRedundantSourceImport mod_name
925 = ptext SLIT("Unnecessary {- SOURCE -} in the import of module") <+> quotes (pprModuleName mod_name)