2 % (c) The GRASP Project, Glasgow University, 1992-1998
4 \section[Rename]{Renaming and dependency analysis passes}
7 module Rename ( renameModule ) where
9 #include "HsVersions.h"
12 import RdrHsSyn ( RdrNameHsModule )
13 import RnHsSyn ( RenamedHsModule, RenamedHsDecl,
14 extractHsTyNames, extractHsCtxtTyNames
17 import CmdLineOpts ( opt_HiMap, opt_D_dump_rn_trace, opt_D_dump_minimal_imports,
18 opt_D_dump_rn, opt_D_dump_rn_stats, opt_WarnDeprecations
21 import RnNames ( getGlobalNames )
22 import RnSource ( rnSourceDecls, rnDecl )
23 import RnIfaces ( getImportedInstDecls, importDecl, getImportVersions, getInterfaceExports,
24 getImportedRules, loadHomeInterface, getSlurped, removeContext
26 import RnEnv ( availName, availsToNameSet, unitAvailEnv, availEnvElts, plusAvailEnv,
27 warnUnusedImports, warnUnusedLocalBinds, lookupImplicitOccRn, pprAvail,
28 FreeVars, plusFVs, plusFV, unitFV, emptyFVs, isEmptyFVs
30 import Module ( Module, ModuleName, WhereFrom(..),
31 moduleNameUserString, mkSearchPath, moduleName, mkThisModule
33 import Name ( Name, isLocallyDefined, NamedThing(..), getSrcLoc,
34 nameOccName, nameUnique, nameModule, maybeUserImportedFrom,
35 isUserImportedExplicitlyName, isUserImportedName,
36 maybeWiredInTyConName, maybeWiredInIdName, isWiredInName
38 import OccName ( occNameFlavour, isValOcc )
40 import TyCon ( isSynTyCon, getSynTyConDefn )
42 import PrelMods ( mAIN_Name, pREL_MAIN_Name, pRELUDE_Name )
43 import TysWiredIn ( unitTyCon, intTyCon, doubleTyCon, boolTyCon )
44 import PrelInfo ( ioTyCon_NAME, thinAirIdNames, fractionalClassKeys, derivingOccurrences )
45 import Type ( namesOfType, funTyCon )
46 import ErrUtils ( printErrorsAndWarnings, dumpIfSet, ghcExit )
47 import BasicTypes ( NewOrData(..) )
48 import Bag ( isEmptyBag, bagToList )
49 import FiniteMap ( FiniteMap, eltsFM, fmToList, emptyFM, addToFM_C )
50 import UniqSupply ( UniqSupply )
51 import UniqFM ( lookupUFM )
52 import Maybes ( maybeToBool )
54 import IO ( openFile, IOMode(..) )
60 renameModule :: UniqSupply
64 , RenamedHsModule -- Output, after renaming
65 , InterfaceDetails -- Interface; for interface file generation
66 , RnNameSupply -- Final env; for renaming derivings
67 , [ModuleName] -- Imported modules; for profiling
70 renameModule us this_mod@(HsModule mod_name vers exports imports local_decls _ loc)
71 = -- Initialise the renamer monad
72 initRn mod_name us (mkSearchPath opt_HiMap) loc
74 \ ((maybe_rn_stuff, dump_action), rn_errs_bag, rn_warns_bag) ->
77 printErrorsAndWarnings rn_errs_bag rn_warns_bag >>
79 -- Dump any debugging output
83 if not (isEmptyBag rn_errs_bag) then
84 ghcExit 1 >> return Nothing
91 rename :: RdrNameHsModule
92 -> RnMG (Maybe (Module, RenamedHsModule, InterfaceDetails, RnNameSupply, [ModuleName]), IO ())
93 rename this_mod@(HsModule mod_name vers _ imports local_decls mod_deprec loc)
94 = -- FIND THE GLOBAL NAME ENVIRONMENT
95 getGlobalNames this_mod `thenRn` \ maybe_stuff ->
97 -- CHECK FOR EARLY EXIT
98 if not (maybeToBool maybe_stuff) then
99 -- Everything is up to date; no need to recompile further
100 rnDump [] [] `thenRn` \ dump_action ->
101 returnRn (Nothing, dump_action)
104 Just (export_env, gbl_env, fixity_env, global_avail_env) = maybe_stuff
105 ExportEnv export_avails _ _ = export_env
109 initRnMS gbl_env fixity_env SourceMode (
110 rnSourceDecls local_decls
111 ) `thenRn` \ (rn_local_decls, source_fvs) ->
113 -- SLURP IN ALL THE NEEDED DECLARATIONS
114 implicitFVs mod_name rn_local_decls `thenRn` \ implicit_fvs ->
116 real_source_fvs = implicit_fvs `plusFV` source_fvs `plusFV` export_fvs
117 -- It's important to do the "plus" this way round, so that
118 -- when compiling the prelude, locally-defined (), Bool, etc
119 -- override the implicit ones.
121 -- The export_fvs make the exported names look just as if they
122 -- occurred in the source program. For the reasoning, see the
123 -- comments with RnIfaces.getImportVersions
124 export_fvs = mkNameSet (map availName export_avails)
126 slurpImpDecls real_source_fvs `thenRn` \ rn_imp_decls ->
128 rn_all_decls = rn_local_decls ++ rn_imp_decls
130 -- COLLECT ALL DEPRECATIONS
131 deprec_sigs = [ ds | ValD bnds <- rn_local_decls, ds <- collectDeprecs bnds ]
132 deprecs = case mod_deprec of
133 Nothing -> deprec_sigs
134 Just txt -> Deprecation (IEModuleContents undefined) txt : deprec_sigs
137 -- EXIT IF ERRORS FOUND
138 checkErrsRn `thenRn` \ no_errs_so_far ->
139 if not no_errs_so_far then
140 -- Found errors already, so exit now
141 rnDump rn_imp_decls rn_all_decls `thenRn` \ dump_action ->
142 returnRn (Nothing, dump_action)
145 -- GENERATE THE VERSION/USAGE INFO
146 getImportVersions mod_name export_env `thenRn` \ my_usages ->
147 getNameSupplyRn `thenRn` \ name_supply ->
149 -- REPORT UNUSED NAMES
150 reportUnusedNames mod_name gbl_env global_avail_env
154 -- RETURN THE RENAMED MODULE
156 has_orphans = any isOrphanDecl rn_local_decls
157 direct_import_mods = [mod | ImportDecl mod _ _ _ _ _ <- imports]
158 renamed_module = HsModule mod_name vers
159 trashed_exports trashed_imports
164 rnDump rn_imp_decls rn_all_decls `thenRn` \ dump_action ->
165 returnRn (Just (mkThisModule mod_name,
167 (InterfaceDetails has_orphans my_usages export_env deprecs),
169 direct_import_mods), dump_action)
171 trashed_exports = {-trace "rnSource:trashed_exports"-} Nothing
172 trashed_imports = {-trace "rnSource:trashed_imports"-} []
174 collectDeprecs EmptyBinds = []
175 collectDeprecs (ThenBinds x y) = collectDeprecs x ++ collectDeprecs y
176 collectDeprecs (MonoBind _ sigs _) = [ d | DeprecSig d _ <- sigs ]
179 @implicitFVs@ forces the renamer to slurp in some things which aren't
180 mentioned explicitly, but which might be needed by the type checker.
183 implicitFVs mod_name decls
184 = mapRn lookupImplicitOccRn implicit_occs `thenRn` \ implicit_names ->
185 returnRn (implicit_main `plusFV`
186 mkNameSet (map getName default_tycons) `plusFV`
187 mkNameSet thinAirIdNames `plusFV`
188 mkNameSet implicit_names)
190 -- Add occurrences for Int, and (), because they
191 -- are the types to which ambigious type variables may be defaulted by
192 -- the type checker; so they won't always appear explicitly.
193 -- [The () one is a GHC extension for defaulting CCall results.]
194 -- ALSO: funTyCon, since it occurs implicitly everywhere!
195 -- (we don't want to be bothered with making funTyCon a
196 -- free var at every function application!)
197 -- Double is dealt with separately in getGates
198 default_tycons = [unitTyCon, funTyCon, boolTyCon, intTyCon]
200 -- Add occurrences for IO or PrimIO
201 implicit_main | mod_name == mAIN_Name
202 || mod_name == pREL_MAIN_Name = unitFV ioTyCon_NAME
203 | otherwise = emptyFVs
205 -- Now add extra "occurrences" for things that
206 -- the deriving mechanism, or defaulting, will later need in order to
208 implicit_occs = foldr ((++) . get) [] decls
210 get (TyClD (TyData _ _ _ _ _ (Just deriv_classes) _ _))
211 = concat (map get_deriv deriv_classes)
214 get_deriv cls = case lookupUFM derivingOccurrences cls of
220 isOrphanDecl (InstD (InstDecl inst_ty _ _ _ _))
221 = not (foldNameSet ((||) . isLocallyDefined) False (extractHsTyNames (removeContext inst_ty)))
222 -- The 'removeContext' is because of
223 -- instance Foo a => Baz T where ...
224 -- The decl is an orphan if Baz and T are both not locally defined,
225 -- even if Foo *is* locally defined
227 isOrphanDecl (RuleD (RuleDecl _ _ _ lhs _ _))
230 -- At the moment we just check for common LHS forms
231 -- Expand as necessary. Getting it wrong just means
232 -- more orphans than necessary
233 check (HsVar v) = not (isLocallyDefined v)
234 check (HsApp f a) = check f && check a
235 check (HsLit _) = False
236 check (OpApp l o _ r) = check l && check o && check r
237 check (NegApp e _) = check e
238 check (HsPar e) = check e
239 check (SectionL e o) = check e && check o
240 check (SectionR o e) = check e && check o
242 check other = True -- Safe fall through
244 isOrphanDecl other = False
249 dupDefaultDeclErrRn (DefaultDecl _ locn1 : dup_things)
250 = pushSrcLocRn locn1 $
253 msg = hang (ptext SLIT("Multiple default declarations"))
254 4 (vcat (map pp dup_things))
255 pp (DefaultDecl _ locn) = ptext SLIT("here was another default declaration") <+> ppr locn
259 %*********************************************************
261 \subsection{Slurping declarations}
263 %*********************************************************
266 -------------------------------------------------------
267 slurpImpDecls source_fvs
268 = traceRn (text "slurpImp" <+> fsep (map ppr (nameSetToList source_fvs))) `thenRn_`
270 -- The current slurped-set records all local things
271 getSlurped `thenRn` \ source_binders ->
272 slurpSourceRefs source_binders source_fvs `thenRn` \ (decls, needed) ->
274 -- And finally get everything else
275 closeDecls decls needed
277 -------------------------------------------------------
278 slurpSourceRefs :: NameSet -- Variables defined in source
279 -> FreeVars -- Variables referenced in source
280 -> RnMG ([RenamedHsDecl],
281 FreeVars) -- Un-satisfied needs
282 -- The declaration (and hence home module) of each gate has
283 -- already been loaded
285 slurpSourceRefs source_binders source_fvs
286 = go_outer [] -- Accumulating decls
287 emptyFVs -- Unsatisfied needs
288 emptyFVs -- Accumulating gates
289 (nameSetToList source_fvs) -- Things whose defn hasn't been loaded yet
291 -- The outer loop repeatedly slurps the decls for the current gates
292 -- and the instance decls
294 -- The outer loop is needed because consider
295 -- instance Foo a => Baz (Maybe a) where ...
296 -- It may be that @Baz@ and @Maybe@ are used in the source module,
297 -- but not @Foo@; so we need to chase @Foo@ too.
299 -- We also need to follow superclass refs. In particular, 'chasing @Foo@' must
300 -- include actually getting in Foo's class decl
301 -- class Wib a => Foo a where ..
302 -- so that its superclasses are discovered. The point is that Wib is a gate too.
303 -- We do this for tycons too, so that we look through type synonyms.
305 go_outer decls fvs all_gates []
306 = returnRn (decls, fvs)
308 go_outer decls fvs all_gates refs -- refs are not necessarily slurped yet
309 = traceRn (text "go_outer" <+> ppr refs) `thenRn_`
310 go_inner decls fvs emptyFVs refs `thenRn` \ (decls1, fvs1, gates1) ->
311 getImportedInstDecls (all_gates `plusFV` gates1) `thenRn` \ inst_decls ->
312 rnInstDecls decls1 fvs1 gates1 inst_decls `thenRn` \ (decls2, fvs2, gates2) ->
313 go_outer decls2 fvs2 (all_gates `plusFV` gates2)
314 (nameSetToList (gates2 `minusNameSet` all_gates))
315 -- Knock out the all_gates because even if we don't slurp any new
316 -- decls we can get some apparently-new gates from wired-in names
318 go_inner decls fvs gates []
319 = returnRn (decls, fvs, gates)
321 go_inner decls fvs gates (wanted_name:refs)
322 | isWiredInName wanted_name
323 = load_home wanted_name `thenRn_`
324 go_inner decls fvs (gates `plusFV` getWiredInGates wanted_name) refs
327 = importDecl wanted_name `thenRn` \ maybe_decl ->
329 Nothing -> go_inner decls fvs gates refs -- No declaration... (already slurped, or local)
330 Just decl -> rnIfaceDecl decl `thenRn` \ (new_decl, fvs1) ->
331 go_inner (new_decl : decls)
333 (gates `plusFV` getGates source_fvs new_decl)
336 -- When we find a wired-in name we must load its
337 -- home module so that we find any instance decls therein
339 | name `elemNameSet` source_binders = returnRn ()
340 -- When compiling the prelude, a wired-in thing may
341 -- be defined in this module, in which case we don't
342 -- want to load its home module!
343 -- Using 'isLocallyDefined' doesn't work because some of
344 -- the free variables returned are simply 'listTyCon_Name',
345 -- with a system provenance. We could look them up every time
346 -- but that seems a waste.
347 | otherwise = loadHomeInterface doc name `thenRn_`
350 doc = ptext SLIT("need home module for wired in thing") <+> ppr name
352 rnInstDecls decls fvs gates []
353 = returnRn (decls, fvs, gates)
354 rnInstDecls decls fvs gates (d:ds)
355 = rnIfaceDecl d `thenRn` \ (new_decl, fvs1) ->
356 rnInstDecls (new_decl:decls)
358 (gates `plusFV` getInstDeclGates new_decl)
364 -------------------------------------------------------
365 -- closeDecls keeps going until the free-var set is empty
366 closeDecls decls needed
367 | not (isEmptyFVs needed)
368 = slurpDecls decls needed `thenRn` \ (decls1, needed1) ->
369 closeDecls decls1 needed1
372 = getImportedRules `thenRn` \ rule_decls ->
374 [] -> returnRn decls -- No new rules, so we are done
375 other -> rnIfaceDecls decls emptyFVs rule_decls `thenRn` \ (decls1, needed1) ->
376 closeDecls decls1 needed1
379 -------------------------------------------------------
380 rnIfaceDecls :: [RenamedHsDecl] -> FreeVars
381 -> [(Module, RdrNameHsDecl)]
382 -> RnM d ([RenamedHsDecl], FreeVars)
383 rnIfaceDecls decls fvs [] = returnRn (decls, fvs)
384 rnIfaceDecls decls fvs (d:ds) = rnIfaceDecl d `thenRn` \ (new_decl, fvs1) ->
385 rnIfaceDecls (new_decl:decls) (fvs1 `plusFV` fvs) ds
387 rnIfaceDecl (mod, decl) = initIfaceRnMS mod (rnDecl decl)
390 -------------------------------------------------------
391 -- Augment decls with any decls needed by needed.
392 -- Return also free vars of the new decls (only)
393 slurpDecls decls needed
394 = go decls emptyFVs (nameSetToList needed)
396 go decls fvs [] = returnRn (decls, fvs)
397 go decls fvs (ref:refs) = slurpDecl decls fvs ref `thenRn` \ (decls1, fvs1) ->
400 -------------------------------------------------------
401 slurpDecl decls fvs wanted_name
402 = importDecl wanted_name `thenRn` \ maybe_decl ->
404 -- No declaration... (wired in thing)
405 Nothing -> returnRn (decls, fvs)
407 -- Found a declaration... rename it
408 Just decl -> rnIfaceDecl decl `thenRn` \ (new_decl, fvs1) ->
409 returnRn (new_decl:decls, fvs1 `plusFV` fvs)
413 %*********************************************************
415 \subsection{Extracting the `gates'}
417 %*********************************************************
419 When we import a declaration like
421 data T = T1 Wibble | T2 Wobble
423 we don't want to treat @Wibble@ and @Wobble@ as gates
424 {\em unless} @T1@, @T2@ respectively are mentioned by the user program.
425 If only @T@ is mentioned
426 we want only @T@ to be a gate;
427 that way we don't suck in useless instance
428 decls for (say) @Eq Wibble@, when they can't possibly be useful.
430 @getGates@ takes a newly imported (and renamed) decl, and the free
431 vars of the source program, and extracts from the decl the gate names.
434 getGates source_fvs (SigD (IfaceSig _ ty _ _))
435 = extractHsTyNames ty
437 getGates source_fvs (TyClD (ClassDecl ctxt cls tvs _ sigs _ _ _ _ _ _ _))
438 = (delListFromNameSet (foldr (plusFV . get) (extractHsCtxtTyNames ctxt) sigs)
439 (map getTyVarName tvs)
440 `addOneToNameSet` cls)
441 `plusFV` maybe_double
443 get (ClassOpSig n _ _ ty _)
444 | n `elemNameSet` source_fvs = extractHsTyNames ty
445 | otherwise = emptyFVs
447 -- If we load any numeric class that doesn't have
448 -- Int as an instance, add Double to the gates.
449 -- This takes account of the fact that Double might be needed for
450 -- defaulting, but we don't want to load Double (and all its baggage)
451 -- if the more exotic classes aren't used at all.
452 maybe_double | nameUnique cls `elem` fractionalClassKeys
453 = unitFV (getName doubleTyCon)
457 getGates source_fvs (TyClD (TySynonym tycon tvs ty _))
458 = delListFromNameSet (extractHsTyNames ty)
459 (map getTyVarName tvs)
460 -- A type synonym type constructor isn't a "gate" for instance decls
462 getGates source_fvs (TyClD (TyData _ ctxt tycon tvs cons _ _ _))
463 = delListFromNameSet (foldr (plusFV . get) (extractHsCtxtTyNames ctxt) cons)
464 (map getTyVarName tvs)
465 `addOneToNameSet` tycon
467 get (ConDecl n _ tvs ctxt details _)
468 | n `elemNameSet` source_fvs
469 -- If the constructor is method, get fvs from all its fields
470 = delListFromNameSet (get_details details `plusFV`
471 extractHsCtxtTyNames ctxt)
472 (map getTyVarName tvs)
473 get (ConDecl n _ tvs ctxt (RecCon fields) _)
474 -- Even if the constructor isn't mentioned, the fields
475 -- might be, as selectors. They can't mention existentially
476 -- bound tyvars (typechecker checks for that) so no need for
477 -- the deleteListFromNameSet part
478 = foldr (plusFV . get_field) emptyFVs fields
480 get other_con = emptyFVs
482 get_details (VanillaCon tys) = plusFVs (map get_bang tys)
483 get_details (InfixCon t1 t2) = get_bang t1 `plusFV` get_bang t2
484 get_details (RecCon fields) = plusFVs [get_bang t | (_, t) <- fields]
485 get_details (NewCon t _) = extractHsTyNames t
487 get_field (fs,t) | any (`elemNameSet` source_fvs) fs = get_bang t
488 | otherwise = emptyFVs
490 get_bang (Banged t) = extractHsTyNames t
491 get_bang (Unbanged t) = extractHsTyNames t
492 get_bang (Unpacked t) = extractHsTyNames t
494 getGates source_fvs other_decl = emptyFVs
497 @getWiredInGates@ is just like @getGates@, but it sees a wired-in @Name@
498 rather than a declaration.
501 getWiredInGates :: Name -> FreeVars
502 getWiredInGates name -- No classes are wired in
503 | is_id = getWiredInGates_s (namesOfType (idType the_id))
504 | isSynTyCon the_tycon = getWiredInGates_s
505 (delListFromNameSet (namesOfType ty) (map getName tyvars))
506 | otherwise = unitFV name
508 maybe_wired_in_id = maybeWiredInIdName name
509 is_id = maybeToBool maybe_wired_in_id
510 maybe_wired_in_tycon = maybeWiredInTyConName name
511 Just the_id = maybe_wired_in_id
512 Just the_tycon = maybe_wired_in_tycon
513 (tyvars,ty) = getSynTyConDefn the_tycon
515 getWiredInGates_s names = foldr (plusFV . getWiredInGates) emptyFVs (nameSetToList names)
519 getInstDeclGates (InstD (InstDecl inst_ty _ _ _ _)) = extractHsTyNames inst_ty
520 getInstDeclGates other = emptyFVs
524 %*********************************************************
526 \subsection{Unused names}
528 %*********************************************************
531 reportUnusedNames :: ModuleName -> GlobalRdrEnv -> AvailEnv -> ExportEnv -> NameSet -> RnMG ()
532 reportUnusedNames mod_name gbl_env avail_env (ExportEnv export_avails _ _) mentioned_names
534 used_names = mentioned_names `unionNameSets` availsToNameSet export_avails
536 -- Now, a use of C implies a use of T,
537 -- if C was brought into scope by T(..) or T(C)
538 really_used_names = used_names `unionNameSets`
539 mkNameSet [ availName parent_avail
540 | sub_name <- nameSetToList used_names
541 , isValOcc (getOccName sub_name)
543 -- Usually, every used name will appear in avail_env, but there
544 -- is one time when it doesn't: tuples and other built in syntax. When you
545 -- write (a,b) that gives rise to a *use* of "(,)", so that the
546 -- instances will get pulled in, but the tycon "(,)" isn't actually
547 -- in scope. Hence the isValOcc filter.
549 -- Also, (-x) gives rise to an implicit use of 'negate'; similarly,
550 -- 3.5 gives rise to an implcit use of :%
551 -- hence the isUserImportedName filter on the warning
554 = case lookupNameEnv avail_env sub_name of
556 Nothing -> WARN( isUserImportedName sub_name,
557 text "reportUnusedName: not in avail_env" <+> ppr sub_name )
560 , case parent_avail of { AvailTC _ _ -> True; other -> False }
563 defined_names = mkNameSet (concat (rdrEnvElts gbl_env))
564 defined_but_not_used =
565 nameSetToList (defined_names `minusNameSet` really_used_names)
567 -- Filter out the ones only defined implicitly
568 bad_locals = [n | n <- defined_but_not_used, isLocallyDefined n]
569 bad_imps = [n | n <- defined_but_not_used, isUserImportedExplicitlyName n]
571 deprec_used deprec_env = [ (n,txt)
572 | n <- nameSetToList mentioned_names,
573 not (isLocallyDefined n),
574 Just txt <- [lookupNameEnv deprec_env n] ]
576 minimal_imports :: FiniteMap Module AvailEnv
577 minimal_imports = foldNameSet add emptyFM really_used_names
578 add n acc = case maybeUserImportedFrom n of
580 Just m -> addToFM_C plusAvailEnv acc m
581 (unitAvailEnv (mk_avail n))
582 mk_avail n = case lookupNameEnv avail_env n of
583 Just (AvailTC m _) | n==m -> AvailTC n [n]
584 | otherwise -> AvailTC m [n,m]
585 Just avail -> Avail n
586 Nothing -> pprPanic "mk_avail" (ppr n)
588 warnUnusedLocalBinds bad_locals `thenRn_`
589 warnUnusedImports bad_imps `thenRn_`
590 printMinimalImports mod_name minimal_imports `thenRn_`
591 getIfacesRn `thenRn` \ ifaces ->
592 (if opt_WarnDeprecations
593 then mapRn_ warnDeprec (deprec_used (iDeprecs ifaces))
596 -- ToDo: deal with original imports with 'qualified' and 'as M' clauses
597 printMinimalImports mod_name imps
598 | not opt_D_dump_minimal_imports
601 = mapRn to_ies (fmToList imps) `thenRn` \ mod_ies ->
602 ioToRnM (do { h <- openFile filename WriteMode ;
603 printForUser h (vcat (map ppr_mod_ie mod_ies))
607 filename = moduleNameUserString mod_name ++ ".imports"
608 ppr_mod_ie (mod_name, ies)
609 | mod_name == pRELUDE_Name
612 = ptext SLIT("import") <+> ppr mod_name <>
613 parens (fsep (punctuate comma (map ppr ies)))
615 to_ies (mod, avail_env) = mapRn to_ie (availEnvElts avail_env) `thenRn` \ ies ->
616 returnRn (moduleName mod, ies)
618 to_ie :: AvailInfo -> RnMG (IE Name)
619 to_ie (Avail n) = returnRn (IEVar n)
620 to_ie (AvailTC n [m]) = ASSERT( n==m )
621 returnRn (IEThingAbs n)
622 to_ie (AvailTC n ns) = getInterfaceExports (moduleName (nameModule n))
623 ImportBySystem `thenRn` \ (_, avails) ->
624 case [ms | AvailTC m ms <- avails, m == n] of
625 [ms] | all (`elem` ns) ms -> returnRn (IEThingAll n)
626 | otherwise -> returnRn (IEThingWith n (filter (/= n) ns))
627 other -> pprTrace "to_ie" (ppr n <+> ppr (nameModule n) <+> ppr other) $
630 warnDeprec :: (Name, DeprecTxt) -> RnM d ()
631 warnDeprec (name, txt)
632 = pushSrcLocRn (getSrcLoc name) $
634 sep [ text (occNameFlavour (nameOccName name)) <+> ppr name <+>
635 text "is deprecated:", nest 4 (ppr txt) ]
638 rnDump :: [RenamedHsDecl] -- Renamed imported decls
639 -> [RenamedHsDecl] -- Renamed local decls
641 rnDump imp_decls decls
642 | opt_D_dump_rn_trace ||
643 opt_D_dump_rn_stats ||
645 = getRnStats imp_decls `thenRn` \ stats_msg ->
647 returnRn (printErrs stats_msg >>
648 dumpIfSet opt_D_dump_rn "Renamer:" (vcat (map ppr decls)))
650 | otherwise = returnRn (return ())
654 %*********************************************************
656 \subsection{Statistics}
658 %*********************************************************
661 getRnStats :: [RenamedHsDecl] -> RnMG SDoc
662 getRnStats imported_decls
663 = getIfacesRn `thenRn` \ ifaces ->
665 n_mods = length [() | (_, _, _, Just _) <- eltsFM (iImpModInfo ifaces)]
667 decls_read = [decl | (_, avail, True, (_,decl)) <- nameEnvElts (iDecls ifaces),
668 -- Data, newtype, and class decls are in the decls_fm
669 -- under multiple names; the tycon/class, and each
670 -- constructor/class op too.
671 -- The 'True' selects just the 'main' decl
672 not (isLocallyDefined (availName avail))
675 (cd_rd, dd_rd, nd_rd, sd_rd, vd_rd, _) = count_decls decls_read
676 (cd_sp, dd_sp, nd_sp, sd_sp, vd_sp, id_sp) = count_decls imported_decls
678 unslurped_insts = iInsts ifaces
679 inst_decls_unslurped = length (bagToList unslurped_insts)
680 inst_decls_read = id_sp + inst_decls_unslurped
683 [int n_mods <+> text "interfaces read",
684 hsep [ int cd_sp, text "class decls imported, out of",
685 int cd_rd, text "read"],
686 hsep [ int dd_sp, text "data decls imported, out of",
687 int dd_rd, text "read"],
688 hsep [ int nd_sp, text "newtype decls imported, out of",
689 int nd_rd, text "read"],
690 hsep [int sd_sp, text "type synonym decls imported, out of",
691 int sd_rd, text "read"],
692 hsep [int vd_sp, text "value signatures imported, out of",
693 int vd_rd, text "read"],
694 hsep [int id_sp, text "instance decls imported, out of",
695 int inst_decls_read, text "read"],
696 text "cls dcls slurp" <+> fsep (map (ppr . tyClDeclName)
697 [d | TyClD d <- imported_decls, isClassDecl d]),
698 text "cls dcls read" <+> fsep (map (ppr . tyClDeclName)
699 [d | TyClD d <- decls_read, isClassDecl d])]
701 returnRn (hcat [text "Renamer stats: ", stats])
711 tycl_decls = [d | TyClD d <- decls]
712 (class_decls, data_decls, newtype_decls, syn_decls) = countTyClDecls tycl_decls
714 val_decls = length [() | SigD _ <- decls]
715 inst_decls = length [() | InstD _ <- decls]