2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[RnMonad]{The monad used by the renamer}
21 #include "HsVersions.h"
23 #if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 405
24 import IOExts ( fixIO )
25 #elif defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 302
26 import PrelIOBase ( fixIO ) -- Should be in GlaExts
28 import IOBase ( fixIO )
30 import IOExts ( IORef, newIORef, readIORef, writeIORef, unsafePerformIO )
34 import RnHsSyn ( RenamedFixitySig, RenamedDeprecation )
35 import BasicTypes ( Version )
36 import SrcLoc ( noSrcLoc )
37 import ErrUtils ( addShortErrLocLine, addShortWarnLocLine,
38 pprBagOfErrors, ErrMsg, WarnMsg, Message
40 import Name ( Name, OccName, NamedThing(..),
41 isLocallyDefinedName, nameModule, nameOccName,
42 decode, mkLocalName, mkUnboundName
44 import Module ( Module, ModuleName, ModuleHiMap, SearchPath, WhereFrom,
45 mkModuleHiMaps, moduleName, mkVanillaModule, mkSearchPath
48 import RdrName ( RdrName, dummyRdrVarName, rdrNameOcc )
49 import CmdLineOpts ( opt_D_dump_rn_trace, opt_HiMap )
50 import PrelInfo ( builtinNames )
51 import TysWiredIn ( boolTyCon )
52 import SrcLoc ( SrcLoc, mkGeneratedSrcLoc )
53 import Unique ( Unique, getUnique, unboundKey )
54 import UniqFM ( UniqFM )
55 import FiniteMap ( FiniteMap, emptyFM, bagToFM, lookupFM, addToFM, addListToFM,
56 addListToFM_C, addToFM_C, eltsFM, fmToList
58 import Bag ( Bag, mapBag, emptyBag, isEmptyBag, snocBag )
59 import Maybes ( mapMaybe )
66 infixr 9 `thenRn`, `thenRn_`
70 %************************************************************************
72 \subsection{Somewhat magical interface to other monads}
74 %************************************************************************
77 ioToRnM :: IO r -> RnM d (Either IOError r)
78 ioToRnM io rn_down g_down = (io >>= \ ok -> return (Right ok))
80 (\ err -> return (Left err))
82 traceRn :: SDoc -> RnM d ()
83 traceRn msg | opt_D_dump_rn_trace = putDocRn msg
84 | otherwise = returnRn ()
86 putDocRn :: SDoc -> RnM d ()
87 putDocRn msg = ioToRnM (printErrs msg) `thenRn_`
92 %************************************************************************
94 \subsection{Data types}
96 %************************************************************************
98 %===================================================
99 \subsubsection{ MONAD TYPES}
100 %===================================================
103 type RnM d r = RnDown -> d -> IO r
104 type RnMS r = RnM SDown r -- Renaming source
105 type RnMG r = RnM () r -- Getting global names etc
108 data RnDown = RnDown {
109 rn_mod :: ModuleName,
111 rn_ns :: IORef RnNameSupply,
112 rn_errs :: IORef (Bag WarnMsg, Bag ErrMsg),
113 rn_ifaces :: IORef Ifaces,
114 rn_hi_maps :: (ModuleHiMap, -- for .hi files
115 ModuleHiMap) -- for .hi-boot files
118 -- For renaming source code
122 rn_genv :: GlobalRdrEnv,
123 -- Global envt; the fixity component gets extended
124 -- with local fixity decls
126 rn_lenv :: LocalRdrEnv, -- Local name envt
127 -- Does *not* include global name envt; may shadow it
128 -- Includes both ordinary variables and type variables;
129 -- they are kept distinct because tyvar have a different
130 -- occurrence contructor (Name.TvOcc)
131 -- We still need the unsullied global name env so that
132 -- we can look up record field names
134 rn_fixenv :: FixityEnv -- Local fixities
135 -- The global fixities are held in the
136 -- rn_ifaces field. Why? See the comments
137 -- with RnIfaces.lookupFixity
140 data RnMode = SourceMode -- Renaming source code
141 | InterfaceMode -- Renaming interface declarations.
144 %===================================================
145 \subsubsection{ ENVIRONMENTS}
146 %===================================================
149 --------------------------------
150 type RdrNameEnv a = FiniteMap RdrName a
151 type GlobalRdrEnv = RdrNameEnv [Name] -- The list is because there may be name clashes
152 -- These only get reported on lookup,
153 -- not on construction
154 type LocalRdrEnv = RdrNameEnv Name
156 emptyRdrEnv :: RdrNameEnv a
157 lookupRdrEnv :: RdrNameEnv a -> RdrName -> Maybe a
158 addListToRdrEnv :: RdrNameEnv a -> [(RdrName,a)] -> RdrNameEnv a
159 extendRdrEnv :: RdrNameEnv a -> RdrName -> a -> RdrNameEnv a
161 emptyRdrEnv = emptyFM
162 lookupRdrEnv = lookupFM
163 addListToRdrEnv = addListToFM
165 extendRdrEnv = addToFM
166 rdrEnvToList = fmToList
168 --------------------------------
169 type NameEnv a = UniqFM a -- Domain is Name
171 emptyNameEnv :: NameEnv a
172 nameEnvElts :: NameEnv a -> [a]
173 addToNameEnv_C :: (a->a->a) -> NameEnv a -> Name -> a -> NameEnv a
174 addToNameEnv :: NameEnv a -> Name -> a -> NameEnv a
175 plusNameEnv :: NameEnv a -> NameEnv a -> NameEnv a
176 extendNameEnv :: NameEnv a -> [(Name,a)] -> NameEnv a
177 lookupNameEnv :: NameEnv a -> Name -> Maybe a
178 delFromNameEnv :: NameEnv a -> Name -> NameEnv a
179 elemNameEnv :: Name -> NameEnv a -> Bool
181 emptyNameEnv = emptyUFM
182 nameEnvElts = eltsUFM
183 addToNameEnv_C = addToUFM_C
184 addToNameEnv = addToUFM
185 plusNameEnv = plusUFM
186 extendNameEnv = addListToUFM
187 lookupNameEnv = lookupUFM
188 delFromNameEnv = delFromUFM
189 elemNameEnv = elemUFM
191 --------------------------------
192 type FixityEnv = NameEnv RenamedFixitySig
193 -- We keep the whole fixity sig so that we
194 -- can report line-number info when there is a duplicate
195 -- fixity declaration
197 --------------------------------
198 type DeprecationEnv = NameEnv DeprecTxt
202 --------------------------------
206 , FiniteMap String Int
207 -- This is used as a name supply for dictionary functions
208 -- From the inst decl we derive a string, usually by glomming together
209 -- the class and tycon name -- but it doesn't matter exactly how;
210 -- this map then gives a unique int for each inst decl with that
211 -- string. (In Haskell 98 there can only be one,
212 -- but not so in more extended versions; also class CC type T
213 -- and class C type TT might both give the string CCT
215 -- We could just use one Int for all the instance decls, but this
216 -- way the uniques change less when you add an instance decl,
217 -- hence less recompilation
219 , FiniteMap (ModuleName, OccName) Name
220 -- Ensures that one (module,occname) pair gets one unique
221 , FiniteMap OccName Name
222 -- Ensures that one implicit parameter name gets one unique
226 --------------------------------
227 data ExportEnv = ExportEnv Avails Fixities [ModuleName]
228 -- The list of modules is the modules exported
229 -- with 'module M' in the export list
231 type Avails = [AvailInfo]
232 type Fixities = [(Name, Fixity)]
234 type ExportAvails = (FiniteMap ModuleName Avails,
235 -- Used to figure out "module M" export specifiers
236 -- Includes avails only from *unqualified* imports
237 -- (see 1.4 Report Section 5.1.1)
239 NameEnv AvailInfo) -- Used to figure out all other export specifiers.
240 -- Maps a Name to the AvailInfo that contains it
243 data GenAvailInfo name = Avail name -- An ordinary identifier
244 | AvailTC name -- The name of the type or class
245 [name] -- The available pieces of type/class.
246 -- NB: If the type or class is itself
247 -- to be in scope, it must be in this list.
248 -- Thus, typically: AvailTC Eq [Eq, ==, /=]
250 type AvailInfo = GenAvailInfo Name
251 type RdrAvailInfo = GenAvailInfo OccName
254 %===================================================
255 \subsubsection{ INTERFACE FILE STUFF}
256 %===================================================
259 type ExportItem = (ModuleName, [RdrAvailInfo])
260 type VersionInfo name = [ImportVersion name]
262 type ImportVersion name = (ModuleName, Version,
263 WhetherHasOrphans, IsBootInterface, WhatsImported name)
265 type WhetherHasOrphans = Bool
267 -- * an instance decl in a module other than the defn module for
268 -- one of the tycons or classes in the instance head
269 -- * a transformation rule in a module other than the one defining
270 -- the function in the head of the rule.
272 type IsBootInterface = Bool
274 data WhatsImported name = Everything
275 | Specifically [LocalVersion name] -- List guaranteed non-empty
277 -- ("M", hif, ver, Everything) means there was a "module M" in
278 -- this module's export list, so we just have to go by M's version, "ver",
279 -- not the list of LocalVersions.
282 type LocalVersion name = (name, Version)
286 pi_mod :: Version, -- Module version number
287 pi_orphan :: WhetherHasOrphans, -- Whether this module has orphans
288 pi_usages :: [ImportVersion OccName], -- Usages
289 pi_exports :: [ExportItem], -- Exports
290 pi_decls :: [(Version, RdrNameHsDecl)], -- Local definitions
291 pi_insts :: [RdrNameInstDecl], -- Local instance declarations
292 pi_rules :: [RdrNameRuleDecl], -- Rules
293 pi_deprecs :: [RdrNameDeprecation] -- Deprecations
296 data InterfaceDetails
297 = InterfaceDetails WhetherHasOrphans
298 (VersionInfo Name) -- Version information for what this module imports
299 ExportEnv -- What modules this one depends on
303 -- needed by Main to fish out the fixities assoc list.
304 getIfaceFixities :: InterfaceDetails -> Fixities
305 getIfaceFixities (InterfaceDetails _ _ (ExportEnv _ fs _) _) = fs
308 type RdrNamePragma = () -- Fudge for now
311 data Ifaces = Ifaces {
312 iImpModInfo :: ImportedModuleInfo,
313 -- Modules this one depends on: that is, the union
314 -- of the modules its *direct* imports depend on.
315 -- NB: The direct imports have .hi files that enumerate *all* the
316 -- dependencies (direct or not) of the imported module.
318 iDecls :: DeclsMap, -- A single, global map of Names to decls
320 iFixes :: FixityEnv, -- A single, global map of Names to fixities
321 -- See comments with RnIfaces.lookupFixity
324 -- All the names (whether "big" or "small", whether wired-in or not,
325 -- whether locally defined or not) that have been slurped in so far.
327 iVSlurp :: [(Name,Version)],
328 -- All the (a) non-wired-in (b) "big" (c) non-locally-defined
329 -- names that have been slurped in so far, with their versions.
330 -- This is used to generate the "usage" information for this module.
331 -- Subset of the previous field.
333 iInsts :: Bag GatedDecl,
334 -- The as-yet un-slurped instance decls; this bag is depleted when we
335 -- slurp an instance decl so that we don't slurp the same one twice.
336 -- Each is 'gated' by the names that must be available before
337 -- this instance decl is needed.
339 iRules :: Bag GatedDecl,
340 -- Ditto transformation rules
342 iDeprecs :: DeprecationEnv
345 type GatedDecl = (NameSet, (Module, RdrNameHsDecl))
347 type ImportedModuleInfo
348 = FiniteMap ModuleName (Version, WhetherHasOrphans, IsBootInterface, Maybe (Module, Avails))
349 -- Suppose the domain element is module 'A'
351 -- The first Bool is True if A contains
352 -- 'orphan' rules or instance decls
354 -- The second Bool is true if the interface file actually
355 -- read was an .hi-boot file
357 -- Nothing => A's interface not yet read, but this module has
358 -- imported a module, B, that itself depends on A
360 -- Just xx => A's interface has been read. The Module in
361 -- the Just has the correct Dll flag
363 -- This set is used to decide whether to look for
364 -- A.hi or A.hi-boot when importing A.f.
365 -- Basically, we look for A.hi if A is in the map, and A.hi-boot
368 type DeclsMap = NameEnv (Version, AvailInfo, Bool, (Module, RdrNameHsDecl))
369 -- A DeclsMap contains a binding for each Name in the declaration
370 -- including the constructors of a type decl etc.
371 -- The Bool is True just for the 'main' Name.
375 %************************************************************************
377 \subsection{Main monad code}
379 %************************************************************************
382 initRn :: ModuleName -> UniqSupply -> SearchPath -> SrcLoc
384 -> IO (r, Bag ErrMsg, Bag WarnMsg)
386 initRn mod us dirs loc do_rn = do
387 himaps <- mkModuleHiMaps dirs
388 names_var <- newIORef (us, emptyFM, builtins, emptyFM)
389 errs_var <- newIORef (emptyBag,emptyBag)
390 iface_var <- newIORef emptyIfaces
392 rn_down = RnDown { rn_loc = loc, rn_ns = names_var,
395 rn_ifaces = iface_var,
399 res <- do_rn rn_down ()
401 -- grab errors and return
402 (warns, errs) <- readIORef errs_var
404 return (res, errs, warns)
407 initRnMS :: GlobalRdrEnv -> FixityEnv -> RnMode -> RnMS r -> RnM d r
408 initRnMS rn_env fixity_env mode thing_inside rn_down g_down
410 s_down = SDown { rn_genv = rn_env, rn_lenv = emptyRdrEnv,
411 rn_fixenv = fixity_env, rn_mode = mode }
413 thing_inside rn_down s_down
415 initIfaceRnMS :: Module -> RnMS r -> RnM d r
416 initIfaceRnMS mod thing_inside
417 = initRnMS emptyRdrEnv emptyNameEnv InterfaceMode $
418 setModuleRn (moduleName mod) thing_inside
420 emptyIfaces :: Ifaces
421 emptyIfaces = Ifaces { iImpModInfo = emptyFM,
422 iDecls = emptyNameEnv,
423 iFixes = emptyNameEnv,
424 iSlurp = unitNameSet (mkUnboundName dummyRdrVarName),
425 -- Pretend that the dummy unbound name has already been
426 -- slurped. This is what's returned for an out-of-scope name,
427 -- and we don't want thereby to try to suck it in!
431 iDeprecs = emptyNameEnv
434 builtins :: FiniteMap (ModuleName,OccName) Name
437 mapBag (\ name -> ((moduleName (nameModule name), nameOccName name), name))
441 @renameSourceCode@ is used to rename stuff ``out-of-line'';
442 that is, not as part of the main renamer.
443 Sole examples: derived definitions,
444 which are only generated in the type checker.
446 The @RnNameSupply@ includes a @UniqueSupply@, so if you call it more than
447 once you must either split it, or install a fresh unique supply.
450 renameSourceCode :: ModuleName
455 renameSourceCode mod_name name_supply m
457 -- It's not really unsafe! When renaming source code we
458 -- only do any I/O if we need to read in a fixity declaration;
459 -- and that doesn't happen in pragmas etc
461 mkModuleHiMaps (mkSearchPath opt_HiMap) >>= \ himaps ->
462 newIORef name_supply >>= \ names_var ->
463 newIORef (emptyBag,emptyBag) >>= \ errs_var ->
465 rn_down = RnDown { rn_loc = mkGeneratedSrcLoc, rn_ns = names_var,
466 rn_errs = errs_var, rn_hi_maps = himaps,
468 rn_ifaces = panic "rnameSourceCode: rn_ifaces" -- Not required
470 s_down = SDown { rn_mode = InterfaceMode,
471 -- So that we can refer to PrelBase.True etc
472 rn_genv = emptyRdrEnv, rn_lenv = emptyRdrEnv,
473 rn_fixenv = emptyNameEnv }
475 m rn_down s_down >>= \ result ->
477 readIORef errs_var >>= \ (warns,errs) ->
479 (if not (isEmptyBag errs) then
480 pprTrace "Urk! renameSourceCode found errors" (display errs)
482 else if not (isEmptyBag warns) then
483 pprTrace "Note: renameSourceCode found warnings" (display warns)
491 display errs = pprBagOfErrors errs
493 {-# INLINE thenRn #-}
494 {-# INLINE thenRn_ #-}
495 {-# INLINE returnRn #-}
498 returnRn :: a -> RnM d a
499 thenRn :: RnM d a -> (a -> RnM d b) -> RnM d b
500 thenRn_ :: RnM d a -> RnM d b -> RnM d b
501 andRn :: (a -> a -> a) -> RnM d a -> RnM d a -> RnM d a
502 mapRn :: (a -> RnM d b) -> [a] -> RnM d [b]
503 mapRn_ :: (a -> RnM d b) -> [a] -> RnM d ()
504 mapMaybeRn :: (a -> RnM d (Maybe b)) -> [a] -> RnM d [b]
505 flatMapRn :: (a -> RnM d [b]) -> [a] -> RnM d [b]
506 sequenceRn :: [RnM d a] -> RnM d [a]
507 foldlRn :: (b -> a -> RnM d b) -> b -> [a] -> RnM d b
508 mapAndUnzipRn :: (a -> RnM d (b,c)) -> [a] -> RnM d ([b],[c])
509 fixRn :: (a -> RnM d a) -> RnM d a
511 returnRn v gdown ldown = return v
512 thenRn m k gdown ldown = m gdown ldown >>= \ r -> k r gdown ldown
513 thenRn_ m k gdown ldown = m gdown ldown >> k gdown ldown
514 fixRn m gdown ldown = fixIO (\r -> m r gdown ldown)
515 andRn combiner m1 m2 gdown ldown
516 = m1 gdown ldown >>= \ res1 ->
517 m2 gdown ldown >>= \ res2 ->
518 return (combiner res1 res2)
520 sequenceRn [] = returnRn []
521 sequenceRn (m:ms) = m `thenRn` \ r ->
522 sequenceRn ms `thenRn` \ rs ->
525 mapRn f [] = returnRn []
527 = f x `thenRn` \ r ->
528 mapRn f xs `thenRn` \ rs ->
531 mapRn_ f [] = returnRn ()
536 foldlRn k z [] = returnRn z
537 foldlRn k z (x:xs) = k z x `thenRn` \ z' ->
540 mapAndUnzipRn f [] = returnRn ([],[])
541 mapAndUnzipRn f (x:xs)
542 = f x `thenRn` \ (r1, r2) ->
543 mapAndUnzipRn f xs `thenRn` \ (rs1, rs2) ->
544 returnRn (r1:rs1, r2:rs2)
546 mapAndUnzip3Rn f [] = returnRn ([],[],[])
547 mapAndUnzip3Rn f (x:xs)
548 = f x `thenRn` \ (r1, r2, r3) ->
549 mapAndUnzip3Rn f xs `thenRn` \ (rs1, rs2, rs3) ->
550 returnRn (r1:rs1, r2:rs2, r3:rs3)
552 mapMaybeRn f [] = returnRn []
553 mapMaybeRn f (x:xs) = f x `thenRn` \ maybe_r ->
554 mapMaybeRn f xs `thenRn` \ rs ->
556 Nothing -> returnRn rs
557 Just r -> returnRn (r:rs)
559 flatMapRn f [] = returnRn []
560 flatMapRn f (x:xs) = f x `thenRn` \ r ->
561 flatMapRn f xs `thenRn` \ rs ->
567 %************************************************************************
569 \subsection{Boring plumbing for common part}
571 %************************************************************************
575 \subsubsection{ Errors and warnings}
576 %=====================
579 failWithRn :: a -> Message -> RnM d a
580 failWithRn res msg (RnDown {rn_errs = errs_var, rn_loc = loc}) l_down
581 = readIORef errs_var >>= \ (warns,errs) ->
582 writeIORef errs_var (warns, errs `snocBag` err) >>
585 err = addShortErrLocLine loc msg
587 warnWithRn :: a -> Message -> RnM d a
588 warnWithRn res msg (RnDown {rn_errs = errs_var, rn_loc = loc}) l_down
589 = readIORef errs_var >>= \ (warns,errs) ->
590 writeIORef errs_var (warns `snocBag` warn, errs) >>
593 warn = addShortWarnLocLine loc msg
595 addErrRn :: Message -> RnM d ()
596 addErrRn err = failWithRn () err
598 checkRn :: Bool -> Message -> RnM d () -- Check that a condition is true
599 checkRn False err = addErrRn err
600 checkRn True err = returnRn ()
602 warnCheckRn :: Bool -> Message -> RnM d () -- Check that a condition is true
603 warnCheckRn False err = addWarnRn err
604 warnCheckRn True err = returnRn ()
606 addWarnRn :: Message -> RnM d ()
607 addWarnRn warn = warnWithRn () warn
609 checkErrsRn :: RnM d Bool -- True <=> no errors so far
610 checkErrsRn (RnDown {rn_errs = errs_var}) l_down
611 = readIORef errs_var >>= \ (warns,errs) ->
612 return (isEmptyBag errs)
617 \subsubsection{ Source location}
618 %=====================
621 pushSrcLocRn :: SrcLoc -> RnM d a -> RnM d a
622 pushSrcLocRn loc' m down l_down
623 = m (down {rn_loc = loc'}) l_down
625 getSrcLocRn :: RnM d SrcLoc
626 getSrcLocRn down l_down
627 = return (rn_loc down)
631 \subsubsection{ Name supply}
632 %=====================
635 getNameSupplyRn :: RnM d RnNameSupply
636 getNameSupplyRn rn_down l_down
637 = readIORef (rn_ns rn_down)
639 setNameSupplyRn :: RnNameSupply -> RnM d ()
640 setNameSupplyRn names' (RnDown {rn_ns = names_var}) l_down
641 = writeIORef names_var names'
643 -- See comments with RnNameSupply above.
644 newInstUniq :: String -> RnM d Int
645 newInstUniq key (RnDown {rn_ns = names_var}) l_down
646 = readIORef names_var >>= \ (us, mapInst, cache, ipcache) ->
648 uniq = case lookupFM mapInst key of
651 mapInst' = addToFM mapInst key uniq
653 writeIORef names_var (us, mapInst', cache, ipcache) >>
656 getUniqRn :: RnM d Unique
657 getUniqRn (RnDown {rn_ns = names_var}) l_down
658 = readIORef names_var >>= \ (us, mapInst, cache, ipcache) ->
660 (us1,us') = splitUniqSupply us
662 writeIORef names_var (us', mapInst, cache, ipcache) >>
663 return (uniqFromSupply us1)
667 \subsubsection{ Module}
668 %=====================
671 getModuleRn :: RnM d ModuleName
672 getModuleRn (RnDown {rn_mod = mod_name}) l_down
675 setModuleRn :: ModuleName -> RnM d a -> RnM d a
676 setModuleRn new_mod enclosed_thing rn_down l_down
677 = enclosed_thing (rn_down {rn_mod = new_mod}) l_down
681 %************************************************************************
683 \subsection{Plumbing for rename-source part}
685 %************************************************************************
688 \subsubsection{ RnEnv}
689 %=====================
692 getNameEnvs :: RnMS (GlobalRdrEnv, LocalRdrEnv)
693 getNameEnvs rn_down (SDown {rn_genv = global_env, rn_lenv = local_env})
694 = return (global_env, local_env)
696 getLocalNameEnv :: RnMS LocalRdrEnv
697 getLocalNameEnv rn_down (SDown {rn_lenv = local_env})
700 setLocalNameEnv :: LocalRdrEnv -> RnMS a -> RnMS a
701 setLocalNameEnv local_env' m rn_down l_down
702 = m rn_down (l_down {rn_lenv = local_env'})
704 getFixityEnv :: RnMS FixityEnv
705 getFixityEnv rn_down (SDown {rn_fixenv = fixity_env})
708 extendFixityEnv :: [(Name, RenamedFixitySig)] -> RnMS a -> RnMS a
709 extendFixityEnv fixes enclosed_scope
710 rn_down l_down@(SDown {rn_fixenv = fixity_env})
712 new_fixity_env = extendNameEnv fixity_env fixes
714 enclosed_scope rn_down (l_down {rn_fixenv = new_fixity_env})
718 \subsubsection{ Mode}
719 %=====================
722 getModeRn :: RnMS RnMode
723 getModeRn rn_down (SDown {rn_mode = mode})
726 setModeRn :: RnMode -> RnMS a -> RnMS a
727 setModeRn new_mode thing_inside rn_down l_down
728 = thing_inside rn_down (l_down {rn_mode = new_mode})
732 %************************************************************************
734 \subsection{Plumbing for rename-globals part}
736 %************************************************************************
739 getIfacesRn :: RnM d Ifaces
740 getIfacesRn (RnDown {rn_ifaces = iface_var}) _
741 = readIORef iface_var
743 setIfacesRn :: Ifaces -> RnM d ()
744 setIfacesRn ifaces (RnDown {rn_ifaces = iface_var}) _
745 = writeIORef iface_var ifaces
747 getHiMaps :: RnM d (ModuleHiMap, ModuleHiMap)
748 getHiMaps (RnDown {rn_hi_maps = himaps}) _
753 lookupModuleRn :: ModuleName -> RnM d Module
755 getHiMaps `thenRn` \ (himap, _) ->
756 case lookupFM himap x of
757 Nothing -> returnRn (mkVanillaModule x)
758 Just (_,x) -> returnRn x