2 % (c) The GRASP Project, Glasgow University, 1992-1998
4 \section[Rename]{Renaming and dependency analysis passes}
7 module Rename ( renameModule, closeIfaceDecls, checkOldIface ) where
9 #include "HsVersions.h"
12 import RdrHsSyn ( RdrNameHsModule, RdrNameHsDecl, RdrNameDeprecation,
13 RdrNameTyClDecl, RdrNameRuleDecl, RdrNameInstDecl, RdrNameImportDecl
15 import RnHsSyn ( RenamedHsDecl, RenamedTyClDecl, RenamedRuleDecl, RenamedInstDecl,
17 instDeclFVs, tyClDeclFVs, ruleDeclFVs
20 import CmdLineOpts ( DynFlags, DynFlag(..) )
22 import RnNames ( getGlobalNames )
23 import RnSource ( rnSourceDecls, rnTyClDecl, rnIfaceRuleDecl, rnInstDecl )
24 import RnIfaces ( slurpImpDecls, mkImportInfo,
25 getInterfaceExports, closeDecls,
26 RecompileRequired, recompileRequired
28 import RnHiFiles ( readIface, removeContext,
29 loadExports, loadFixDecls, loadDeprecs )
30 import RnEnv ( availName,
31 emptyAvailEnv, unitAvailEnv, availEnvElts, plusAvailEnv, groupAvails,
32 warnUnusedImports, warnUnusedLocalBinds, warnUnusedModules,
33 lookupOrigNames, lookupGlobalRn, newGlobalName
35 import Module ( Module, ModuleName, WhereFrom(..),
36 moduleNameUserString, moduleName
38 import Name ( Name, isLocallyDefined, NamedThing(..), getSrcLoc,
39 nameOccName, nameModule,
40 mkNameEnv, nameEnvElts, extendNameEnv
42 import RdrName ( elemRdrEnv )
43 import OccName ( occNameFlavour )
45 import TysWiredIn ( unitTyCon, intTyCon, boolTyCon )
46 import PrelNames ( mAIN_Name, pREL_MAIN_Name, pRELUDE_Name,
47 ioTyCon_RDR, main_RDR,
48 unpackCString_RDR, unpackCStringFoldr_RDR, unpackCStringUtf8_RDR,
51 import PrelInfo ( derivingOccurrences )
52 import Type ( funTyCon )
53 import ErrUtils ( dumpIfSet )
54 import Bag ( bagToList )
55 import FiniteMap ( FiniteMap, eltsFM, fmToList, emptyFM, lookupFM,
56 addToFM_C, elemFM, addToFM
58 import UniqFM ( lookupUFM )
59 import Maybes ( maybeToBool, catMaybes )
61 import IO ( openFile, IOMode(..) )
62 import HscTypes ( PersistentCompilerState, HomeIfaceTable, HomeSymbolTable,
63 ModIface(..), WhatsImported(..),
64 VersionInfo(..), ImportVersion, IfaceDecls(..),
65 GlobalRdrEnv, AvailEnv, GenAvailInfo(..), AvailInfo,
66 Provenance(..), ImportReason(..), initialVersionInfo,
67 Deprecations(..), lookupDeprec, lookupTable
69 import List ( partition, nub )
74 %*********************************************************
76 \subsection{The main function: rename}
78 %*********************************************************
81 renameModule :: DynFlags
82 -> HomeIfaceTable -> HomeSymbolTable
83 -> PersistentCompilerState
84 -> Module -> RdrNameHsModule
85 -> IO (PersistentCompilerState, Maybe (ModIface, [RenamedHsDecl]))
86 -- Nothing => some error occurred in the renamer
88 renameModule dflags hit hst old_pcs this_module rdr_module
89 = -- Initialise the renamer monad
91 (new_pcs, errors_found, maybe_rn_stuff)
92 <- initRn dflags hit hst old_pcs this_module (rename this_module rdr_module) ;
94 -- Return results. No harm in updating the PCS
96 return (new_pcs, Nothing)
98 return (new_pcs, maybe_rn_stuff)
103 rename :: Module -> RdrNameHsModule -> RnMG (Maybe (ModIface, [RenamedHsDecl]))
104 rename this_module contents@(HsModule _ _ _ imports local_decls mod_deprec loc)
107 -- FIND THE GLOBAL NAME ENVIRONMENT
108 getGlobalNames this_module contents `thenRn` \ (gbl_env, local_gbl_env,
109 export_avails, global_avail_env) ->
111 -- Exit if we've found any errors
112 checkErrsRn `thenRn` \ no_errs_so_far ->
113 if not no_errs_so_far then
114 -- Found errors already, so exit now
115 rnDump [] [] `thenRn_`
119 -- DEAL WITH DEPRECATIONS
120 rnDeprecs local_gbl_env mod_deprec
121 [d | DeprecD d <- local_decls] `thenRn` \ my_deprecs ->
123 -- DEAL WITH LOCAL FIXITIES
124 fixitiesFromLocalDecls local_gbl_env local_decls `thenRn` \ local_fixity_env ->
127 initRnMS gbl_env local_fixity_env SourceMode (
128 rnSourceDecls local_decls
129 ) `thenRn` \ (rn_local_decls, source_fvs) ->
131 -- CHECK THAT main IS DEFINED, IF REQUIRED
132 checkMain this_module local_gbl_env `thenRn_`
134 -- SLURP IN ALL THE NEEDED DECLARATIONS
135 implicitFVs mod_name rn_local_decls `thenRn` \ implicit_fvs ->
137 -- The export_fvs make the exported names look just as if they
138 -- occurred in the source program. For the reasoning, see the
139 -- comments with RnIfaces.getImportVersions.
140 -- We only need the 'parent name' of the avail;
141 -- that's enough to suck in the declaration.
142 export_fvs = mkNameSet (map availName export_avails)
143 real_source_fvs = source_fvs `plusFV` export_fvs
145 slurp_fvs = implicit_fvs `plusFV` real_source_fvs
146 -- It's important to do the "plus" this way round, so that
147 -- when compiling the prelude, locally-defined (), Bool, etc
148 -- override the implicit ones.
150 slurpImpDecls slurp_fvs `thenRn` \ rn_imp_decls ->
152 -- EXIT IF ERRORS FOUND
153 rnDump rn_imp_decls rn_local_decls `thenRn_`
154 checkErrsRn `thenRn` \ no_errs_so_far ->
155 if not no_errs_so_far then
156 -- Found errors already, so exit now
160 -- GENERATE THE VERSION/USAGE INFO
161 mkImportInfo mod_name imports `thenRn` \ my_usages ->
163 -- RETURN THE RENAMED MODULE
164 getNameSupplyRn `thenRn` \ name_supply ->
165 getIfacesRn `thenRn` \ ifaces ->
167 -- We record fixities even for things that aren't exported,
168 -- so that we can change into the context of this moodule easily
169 fixities = mkNameEnv [ (name, fixity)
170 | FixitySig name fixity loc <- nameEnvElts local_fixity_env
174 -- Sort the exports to make them easier to compare for versions
175 my_exports = groupAvails this_module export_avails
177 mod_iface = ModIface { mi_module = this_module,
178 mi_version = initialVersionInfo,
179 mi_orphan = any isOrphanDecl rn_local_decls,
180 mi_exports = my_exports,
181 mi_globals = gbl_env,
182 mi_usages = my_usages,
183 mi_fixities = fixities,
184 mi_deprecs = my_deprecs,
185 mi_decls = panic "mi_decls"
188 final_decls = rn_local_decls ++ rn_imp_decls
191 -- REPORT UNUSED NAMES, AND DEBUG DUMP
192 reportUnusedNames mod_iface imports global_avail_env
193 real_source_fvs rn_imp_decls `thenRn_`
195 returnRn (Just (mod_iface, final_decls))
197 mod_name = moduleName this_module
200 Checking that main is defined
203 checkMain :: Module -> GlobalRdrEnv -> RnMG ()
204 checkMain this_mod local_env
205 | moduleName this_mod == mAIN_Name
206 = checkRn (main_RDR `elemRdrEnv` local_env) noMainErr
211 @implicitFVs@ forces the renamer to slurp in some things which aren't
212 mentioned explicitly, but which might be needed by the type checker.
215 implicitFVs mod_name decls
216 = lookupOrigNames implicit_occs `thenRn` \ implicit_names ->
217 returnRn (mkNameSet (map getName default_tycons) `plusFV`
220 -- Add occurrences for Int, and (), because they
221 -- are the types to which ambigious type variables may be defaulted by
222 -- the type checker; so they won't always appear explicitly.
223 -- [The () one is a GHC extension for defaulting CCall results.]
224 -- ALSO: funTyCon, since it occurs implicitly everywhere!
225 -- (we don't want to be bothered with making funTyCon a
226 -- free var at every function application!)
227 -- Double is dealt with separately in getGates
228 default_tycons = [unitTyCon, funTyCon, boolTyCon, intTyCon]
230 -- Add occurrences for IO or PrimIO
231 implicit_main | mod_name == mAIN_Name
232 || mod_name == pREL_MAIN_Name = [ioTyCon_RDR]
235 -- Now add extra "occurrences" for things that
236 -- the deriving mechanism, or defaulting, will later need in order to
238 implicit_occs = string_occs ++ foldr ((++) . get) implicit_main decls
240 -- Virtually every program has error messages in it somewhere
241 string_occs = [unpackCString_RDR, unpackCStringFoldr_RDR, unpackCStringUtf8_RDR,
244 get (TyClD (TyData _ _ _ _ _ _ (Just deriv_classes) _ _ _))
245 = concat (map get_deriv deriv_classes)
248 get_deriv cls = case lookupUFM derivingOccurrences cls of
254 isOrphanDecl (InstD (InstDecl inst_ty _ _ _ _))
255 = not (foldNameSet ((||) . isLocallyDefined) False (extractHsTyNames (removeContext inst_ty)))
256 -- The 'removeContext' is because of
257 -- instance Foo a => Baz T where ...
258 -- The decl is an orphan if Baz and T are both not locally defined,
259 -- even if Foo *is* locally defined
261 isOrphanDecl (RuleD (HsRule _ _ _ lhs _ _))
264 -- At the moment we just check for common LHS forms
265 -- Expand as necessary. Getting it wrong just means
266 -- more orphans than necessary
267 check (HsVar v) = not (isLocallyDefined v)
268 check (HsApp f a) = check f && check a
269 check (HsLit _) = False
270 check (HsOverLit _) = False
271 check (OpApp l o _ r) = check l && check o && check r
272 check (NegApp e _) = check e
273 check (HsPar e) = check e
274 check (SectionL e o) = check e && check o
275 check (SectionR o e) = check e && check o
277 check other = True -- Safe fall through
279 isOrphanDecl other = False
283 %*********************************************************
285 \subsection{Fixities}
287 %*********************************************************
290 fixitiesFromLocalDecls :: GlobalRdrEnv -> [RdrNameHsDecl] -> RnMG LocalFixityEnv
291 fixitiesFromLocalDecls gbl_env decls
292 = doptRn Opt_WarnUnusedBinds `thenRn` \ warn_unused ->
293 foldlRn (getFixities warn_unused) emptyNameEnv decls `thenRn` \ env ->
294 traceRn (text "fixity env" <+> vcat (map ppr (nameEnvElts env)))
298 getFixities :: Bool -> LocalFixityEnv -> RdrNameHsDecl -> RnMG LocalFixityEnv
299 getFixities warn_uu acc (FixD fix)
300 = fix_decl warn_uu acc fix
302 getFixities warn_uu acc (TyClD (ClassDecl _ _ _ _ sigs _ _ _ ))
303 = foldlRn (fix_decl warn_uu) acc [sig | FixSig sig <- sigs]
304 -- Get fixities from class decl sigs too.
305 getFixities warn_uu acc other_decl
308 fix_decl warn_uu acc sig@(FixitySig rdr_name fixity loc)
309 = -- Check for fixity decl for something not declared
311 lookupGlobalRn gbl_env rdr_name `thenRn` \ maybe_name ->
313 Nothing -> checkRn (not warn_uu) (unusedFixityDecl rdr_name fixity) `thenRn_`
318 -- Check for duplicate fixity decl
319 case lookupNameEnv acc name of {
320 Just (FixitySig _ _ loc') -> addErrRn (dupFixityDecl rdr_name loc loc')
321 `thenRn_` returnRn acc ;
323 Nothing -> returnRn (extendNameEnv acc name (FixitySig name fixity loc))
328 %*********************************************************
330 \subsection{Deprecations}
332 %*********************************************************
334 For deprecations, all we do is check that the names are in scope.
335 It's only imported deprecations, dealt with in RnIfaces, that we
336 gather them together.
339 rnDeprecs :: GlobalRdrEnv -> Maybe DeprecTxt
340 -> [RdrNameDeprecation] -> RnMG Deprecations
341 rnDeprecs gbl_env Nothing []
344 rnDeprecs gbl_env (Just txt) decls
345 = mapRn (addErrRn . badDeprec) decls `thenRn_`
346 returnRn (DeprecAll txt)
348 rnDeprecs gbl_env Nothing decls
349 = mapRn rn_deprec decls `thenRn` \ pairs ->
350 returnRn (DeprecSome (mkNameEnv (catMaybes pairs)))
352 rn_deprec (Deprecation rdr_name txt loc)
354 lookupGlobalRn gbl_env rdr_name `thenRn` \ maybe_name ->
356 Just n -> returnRn (Just (n,(n,txt)))
357 Nothing -> returnRn Nothing
361 %************************************************************************
363 \subsection{Grabbing the old interface file and checking versions}
365 %************************************************************************
368 checkOldIface :: DynFlags
369 -> HomeIfaceTable -> HomeSymbolTable
370 -> PersistentCompilerState
372 -> Bool -- Source unchanged
373 -> Maybe ModIface -- Old interface from compilation manager, if any
374 -> IO (PersistentCompilerState, Bool, (RecompileRequired, Maybe ModIface))
375 -- True <=> errors happened
377 checkOldIface dflags hit hst pcs iface_path source_unchanged maybe_iface
378 = initRn dflags hit hst pcs (panic "checkOldIface: bogus mod") $
380 -- Load the old interface file, if we havn't already got it
381 loadOldIface iface_path maybe_iface `thenRn` \ maybe_iface2 ->
384 recompileRequired iface_path source_unchanged maybe_iface2 `thenRn` \ recompile ->
386 returnRn (recompile, maybe_iface2)
391 loadOldIface :: FilePath -> Maybe ModIface -> RnMG (Maybe ModIface)
392 loadOldIface iface_path (Just iface)
393 = returnRn (Just iface)
395 loadOldIface iface_path Nothing
396 = -- LOAD THE OLD INTERFACE FILE
397 -- call readIface ...
398 readIface iface_path `thenRn` \ read_result ->
399 case read_result of {
400 Left err -> -- Old interface file not found, or garbled, so we'd better bail out
401 traceRn (vcat [ptext SLIT("No old interface file:"), err]) `thenRn_`
407 let mod = pi_mod iface
408 doc_str = ptext SLIT("need usage info from") <+> ppr mod
411 loadHomeDecls (pi_decls iface) `thenRn` \ decls ->
412 loadHomeRules (pi_rules iface) `thenRn` \ rules ->
413 loadHomeInsts (pi_insts iface) `thenRn` \ insts ->
414 returnRn (decls, rules, insts)
415 ) `thenRn` \ ((decls_vers, new_decls), (rule_vers, new_rules), new_insts) ->
417 mapRn loadHomeUsage (pi_usages iface) `thenRn` \ usages ->
418 loadExports (pi_exports iface) `thenRn` \ (export_vers, avails) ->
419 loadFixDecls mod (pi_fixity iface) `thenRn` \ fix_env ->
420 loadDeprecs mod (pi_deprecs iface) `thenRn` \ deprec_env ->
422 version = VersionInfo { vers_module = pi_vers iface,
423 vers_exports = export_vers,
424 vers_rules = rule_vers,
425 vers_decls = decls_vers }
427 decls = IfaceDecls { dcl_tycl = new_decls,
428 dcl_rules = new_rules,
429 dcl_insts = new_insts }
431 mod_iface = ModIface { mi_module = mod, mi_version = version,
432 mi_exports = avails, mi_orphan = pi_orphan iface,
433 mi_fixities = fix_env, mi_deprecs = deprec_env,
436 mi_globals = panic "No mi_globals in old interface"
439 returnRn (Just mod_iface)
444 loadHomeDecls :: [(Version, RdrNameTyClDecl)]
445 -> RnMS (NameEnv Version, [RenamedTyClDecl])
446 loadHomeDecls decls = foldlRn loadHomeDecl (emptyNameEnv, []) decls
448 loadHomeDecl :: (NameEnv Version, [RenamedTyClDecl])
449 -> (Version, RdrNameTyClDecl)
450 -> RnMS (NameEnv Version, [RenamedTyClDecl])
451 loadHomeDecl (version_map, decls) (version, decl)
452 = rnTyClDecl decl `thenRn` \ decl' ->
453 returnRn (extendNameEnv version_map (tyClDeclName decl') version, decl':decls)
456 loadHomeRules :: (Version, [RdrNameRuleDecl])
457 -> RnMS (Version, [RenamedRuleDecl])
458 loadHomeRules (version, rules)
459 = mapRn rnIfaceRuleDecl rules `thenRn` \ rules' ->
460 returnRn (version, rules')
463 loadHomeInsts :: [RdrNameInstDecl]
464 -> RnMS [RenamedInstDecl]
465 loadHomeInsts insts = mapRn rnInstDecl insts
468 loadHomeUsage :: ImportVersion OccName
469 -> RnMG (ImportVersion Name)
470 loadHomeUsage (mod_name, orphans, is_boot, whats_imported)
471 = rn_imps whats_imported `thenRn` \ whats_imported' ->
472 returnRn (mod_name, orphans, is_boot, whats_imported')
474 rn_imps NothingAtAll = returnRn NothingAtAll
475 rn_imps (Everything v) = returnRn (Everything v)
476 rn_imps (Specifically mv ev items rv) = mapRn rn_imp items `thenRn` \ items' ->
477 returnRn (Specifically mv ev items' rv)
478 rn_imp (occ,vers) = newGlobalName mod_name occ `thenRn` \ name ->
484 %*********************************************************
486 \subsection{Closing up the interface decls}
488 %*********************************************************
490 Suppose we discover we don't need to recompile. Then we start from the
491 IfaceDecls in the ModIface, and fluff them up by sucking in all the decls they need.
494 closeIfaceDecls :: DynFlags
495 -> HomeIfaceTable -> HomeSymbolTable
496 -> PersistentCompilerState
497 -> ModIface -- Get the decls from here
498 -> IO (PersistentCompilerState, Bool, [RenamedHsDecl])
499 -- True <=> errors happened
500 closeIfaceDecls dflags hit hst pcs
501 mod_iface@(ModIface { mi_module = mod, mi_decls = iface_decls })
502 = initRn dflags hit hst pcs mod $
505 rule_decls = dcl_rules iface_decls
506 inst_decls = dcl_insts iface_decls
507 tycl_decls = dcl_tycl iface_decls
508 decls = map RuleD rule_decls ++
509 map InstD inst_decls ++
511 needed = unionManyNameSets (map ruleDeclFVs rule_decls) `unionNameSets`
512 unionManyNameSets (map instDeclFVs inst_decls) `unionNameSets`
513 unionManyNameSets (map tyClDeclFVs tycl_decls)
515 closeDecls decls needed
518 %*********************************************************
520 \subsection{Unused names}
522 %*********************************************************
525 reportUnusedNames :: ModIface -> [RdrNameImportDecl]
530 reportUnusedNames my_mod_iface imports avail_env
531 used_names imported_decls
532 = warnUnusedModules unused_imp_mods `thenRn_`
533 warnUnusedLocalBinds bad_locals `thenRn_`
534 warnUnusedImports bad_imp_names `thenRn_`
535 printMinimalImports my_mod_iface minimal_imports `thenRn_`
536 warnDeprecations my_mod_iface really_used_names `thenRn_`
540 gbl_env = mi_globals my_mod_iface
542 -- Now, a use of C implies a use of T,
543 -- if C was brought into scope by T(..) or T(C)
544 really_used_names = used_names `unionNameSets`
545 mkNameSet [ parent_name
546 | sub_name <- nameSetToList used_names
548 -- Usually, every used name will appear in avail_env, but there
549 -- is one time when it doesn't: tuples and other built in syntax. When you
550 -- write (a,b) that gives rise to a *use* of "(,)", so that the
551 -- instances will get pulled in, but the tycon "(,)" isn't actually
552 -- in scope. Also, (-x) gives rise to an implicit use of 'negate';
553 -- similarly, 3.5 gives rise to an implcit use of :%
554 -- Hence the silent 'False' in all other cases
556 , Just parent_name <- [case lookupNameEnv avail_env sub_name of
557 Just (AvailTC n _) -> Just n
561 defined_names, defined_and_used, defined_but_not_used :: [(Name,Provenance)]
562 defined_names = concat (rdrEnvElts gbl_env)
563 (defined_and_used, defined_but_not_used) = partition used defined_names
564 used (name,_) = not (name `elemNameSet` really_used_names)
566 -- Filter out the ones only defined implicitly
568 bad_locals = [n | (n,LocalDef) <- defined_but_not_used]
570 bad_imp_names :: [(Name,Provenance)]
571 bad_imp_names = [(n,p) | (n,p@(NonLocalDef (UserImport mod _ True) _)) <- defined_but_not_used,
572 not (module_unused mod)]
574 -- inst_mods are directly-imported modules that
575 -- contain instance decl(s) that the renamer decided to suck in
576 -- It's not necessarily redundant to import such modules.
582 -- The import M() is not *necessarily* redundant, even if
583 -- we suck in no instance decls from M (e.g. it contains
584 -- no instance decls, or This contains no code). It may be
585 -- that we import M solely to ensure that M's orphan instance
586 -- decls (or those in its imports) are visible to people who
587 -- import This. Sigh.
588 -- There's really no good way to detect this, so the error message
589 -- in RnEnv.warnUnusedModules is weakened instead
590 inst_mods :: [ModuleName]
591 inst_mods = [m | InstD (InstDecl _ _ _ (Just dfun) _) <- imported_decls,
592 let m = moduleName (nameModule dfun),
593 m `elem` direct_import_mods
596 -- To figure out the minimal set of imports, start with the things
597 -- that are in scope (i.e. in gbl_env). Then just combine them
598 -- into a bunch of avails, so they are properly grouped
599 minimal_imports :: FiniteMap ModuleName AvailEnv
600 minimal_imports0 = emptyFM
601 minimal_imports1 = foldr add_name minimal_imports0 defined_and_used
602 minimal_imports = foldr add_inst_mod minimal_imports1 inst_mods
604 add_name (n,NonLocalDef (UserImport m _ _) _) acc = addToFM_C plusAvailEnv acc (moduleName (nameModule n))
605 (unitAvailEnv (mk_avail n))
606 add_name (n,other_prov) acc = acc
608 mk_avail n = case lookupNameEnv avail_env n of
609 Just (AvailTC m _) | n==m -> AvailTC n [n]
610 | otherwise -> AvailTC m [n,m]
611 Just avail -> Avail n
612 Nothing -> pprPanic "mk_avail" (ppr n)
615 | m `elemFM` acc = acc -- We import something already
616 | otherwise = addToFM acc m emptyAvailEnv
617 -- Add an empty collection of imports for a module
618 -- from which we have sucked only instance decls
620 direct_import_mods :: [ModuleName]
621 direct_import_mods = nub [m | ImportDecl m _ _ _ _ _ <- imports]
623 -- unused_imp_mods are the directly-imported modules
624 -- that are not mentioned in minimal_imports
625 unused_imp_mods = [m | m <- direct_import_mods,
626 not (maybeToBool (lookupFM minimal_imports m)),
629 module_unused :: Module -> Bool
630 module_unused mod = moduleName mod `elem` unused_imp_mods
633 warnDeprecations my_mod_iface used_names
634 = doptRn Opt_WarnDeprecations `thenRn` \ warn_drs ->
635 if not warn_drs then returnRn () else
637 getIfacesRn `thenRn` \ ifaces ->
638 getHomeIfaceTableRn `thenRn` \ hit ->
642 | n <- nameSetToList used_names,
643 Just txt <- [lookup_deprec hit pit n] ]
645 mapRn_ warnDeprec deprecs
648 my_deprecs = mi_deprecs my_mod_iface
649 lookup_deprec hit pit n
650 | isLocallyDefined n = lookupDeprec my_deprecs n
651 | otherwise = case lookupTable hit pit n of
652 Just iface -> lookupDeprec (mi_deprecs iface) n
653 Nothing -> pprPanic "warnDeprecations:" (ppr n)
655 -- ToDo: deal with original imports with 'qualified' and 'as M' clauses
656 printMinimalImports my_mod_iface imps
657 = doptRn Opt_D_dump_minimal_imports `thenRn` \ dump_minimal ->
658 if not dump_minimal then returnRn () else
660 mapRn to_ies (fmToList imps) `thenRn` \ mod_ies ->
661 ioToRnM (do { h <- openFile filename WriteMode ;
662 printForUser h (vcat (map ppr_mod_ie mod_ies))
666 filename = moduleNameUserString (moduleName (mi_module my_mod_iface))
668 ppr_mod_ie (mod_name, ies)
669 | mod_name == pRELUDE_Name
672 = ptext SLIT("import") <+> ppr mod_name <>
673 parens (fsep (punctuate comma (map ppr ies)))
675 to_ies (mod, avail_env) = mapRn to_ie (availEnvElts avail_env) `thenRn` \ ies ->
678 to_ie :: AvailInfo -> RnMG (IE Name)
679 to_ie (Avail n) = returnRn (IEVar n)
680 to_ie (AvailTC n [m]) = ASSERT( n==m )
681 returnRn (IEThingAbs n)
683 = getInterfaceExports n_mod ImportBySystem `thenRn` \ (_, avails_by_module) ->
684 case [xs | (m,as) <- avails_by_module,
688 [xs] | all (`elem` ns) xs -> returnRn (IEThingAll n)
689 | otherwise -> returnRn (IEThingWith n (filter (/= n) ns))
690 other -> pprTrace "to_ie" (ppr n <+> ppr (nameModule n) <+> ppr other) $
693 n_mod = moduleName (nameModule n)
695 rnDump :: [RenamedHsDecl] -- Renamed imported decls
696 -> [RenamedHsDecl] -- Renamed local decls
698 rnDump imp_decls local_decls
699 = doptRn Opt_D_dump_rn_trace `thenRn` \ dump_rn_trace ->
700 doptRn Opt_D_dump_rn_stats `thenRn` \ dump_rn_stats ->
701 doptRn Opt_D_dump_rn `thenRn` \ dump_rn ->
702 getIfacesRn `thenRn` \ ifaces ->
704 ioToRnM (do { dumpIfSet (dump_rn_trace || dump_rn_stats || dump_rn)
706 (getRnStats imp_decls ifaces) ;
708 dumpIfSet dump_rn "Renamer:"
709 (vcat (map ppr (local_decls ++ imp_decls)))
716 %*********************************************************
718 \subsection{Statistics}
720 %*********************************************************
723 getRnStats :: [RenamedHsDecl] -> Ifaces -> SDoc
724 getRnStats imported_decls ifaces
725 = hcat [text "Renamer stats: ", stats]
727 n_mods = length [() | (_, _, True) <- eltsFM (iImpModInfo ifaces)]
729 decls_read = [decl | (avail, True, (_,decl)) <- nameEnvElts (iDecls ifaces),
730 -- Data, newtype, and class decls are in the decls_fm
731 -- under multiple names; the tycon/class, and each
732 -- constructor/class op too.
733 -- The 'True' selects just the 'main' decl
734 not (isLocallyDefined (availName avail))
737 (cd_rd, dd_rd, nd_rd, sd_rd, vd_rd) = countTyClDecls decls_read
738 (cd_sp, dd_sp, nd_sp, sd_sp, vd_sp, id_sp) = count_decls imported_decls
740 unslurped_insts = iInsts ifaces
741 inst_decls_unslurped = length (bagToList unslurped_insts)
742 inst_decls_read = id_sp + inst_decls_unslurped
745 [int n_mods <+> text "interfaces read",
746 hsep [ int cd_sp, text "class decls imported, out of",
747 int cd_rd, text "read"],
748 hsep [ int dd_sp, text "data decls imported, out of",
749 int dd_rd, text "read"],
750 hsep [ int nd_sp, text "newtype decls imported, out of",
751 int nd_rd, text "read"],
752 hsep [int sd_sp, text "type synonym decls imported, out of",
753 int sd_rd, text "read"],
754 hsep [int vd_sp, text "value signatures imported, out of",
755 int vd_rd, text "read"],
756 hsep [int id_sp, text "instance decls imported, out of",
757 int inst_decls_read, text "read"],
758 text "cls dcls slurp" <+> fsep (map (ppr . tyClDeclName)
759 [d | TyClD d <- imported_decls, isClassDecl d]),
760 text "cls dcls read" <+> fsep (map (ppr . tyClDeclName)
761 [d | d <- decls_read, isClassDecl d])]
771 tycl_decls = [d | TyClD d <- decls]
772 (class_decls, data_decls, newtype_decls, syn_decls, val_decls) = countTyClDecls tycl_decls
774 inst_decls = length [() | InstD _ <- decls]
778 %************************************************************************
780 \subsection{Errors and warnings}
782 %************************************************************************
785 warnDeprec :: (Name, DeprecTxt) -> RnM d ()
786 warnDeprec (name, txt)
787 = pushSrcLocRn (getSrcLoc name) $
789 sep [ text (occNameFlavour (nameOccName name)) <+> ppr name <+>
790 text "is deprecated:", nest 4 (ppr txt) ]
793 unusedFixityDecl rdr_name fixity
794 = hsep [ptext SLIT("Unused fixity declaration for"), quotes (ppr rdr_name)]
796 dupFixityDecl rdr_name loc1 loc2
797 = vcat [ptext SLIT("Multiple fixity declarations for") <+> quotes (ppr rdr_name),
798 ptext SLIT("at ") <+> ppr loc1,
799 ptext SLIT("and") <+> ppr loc2]
802 = sep [ptext SLIT("Illegal deprecation when whole module is deprecated"),
806 = hsep [ptext SLIT("Module"), quotes (ppr mAIN_Name),
807 ptext SLIT("must include a definition for"), quotes (ptext SLIT("main"))]