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 plusNameEnv_C :: (a->a->a) -> NameEnv a -> NameEnv a -> NameEnv a
177 extendNameEnv :: NameEnv a -> [(Name,a)] -> NameEnv a
178 lookupNameEnv :: NameEnv a -> Name -> Maybe a
179 delFromNameEnv :: NameEnv a -> Name -> NameEnv a
180 elemNameEnv :: Name -> NameEnv a -> Bool
181 unitNameEnv :: Name -> a -> NameEnv a
183 emptyNameEnv = emptyUFM
184 nameEnvElts = eltsUFM
185 addToNameEnv_C = addToUFM_C
186 addToNameEnv = addToUFM
187 plusNameEnv = plusUFM
188 plusNameEnv_C = plusUFM_C
189 extendNameEnv = addListToUFM
190 lookupNameEnv = lookupUFM
191 delFromNameEnv = delFromUFM
192 elemNameEnv = elemUFM
193 unitNameEnv = unitUFM
195 --------------------------------
196 type FixityEnv = NameEnv RenamedFixitySig
197 -- We keep the whole fixity sig so that we
198 -- can report line-number info when there is a duplicate
199 -- fixity declaration
201 --------------------------------
202 type DeprecationEnv = NameEnv DeprecTxt
206 --------------------------------
210 , FiniteMap String Int
211 -- This is used as a name supply for dictionary functions
212 -- From the inst decl we derive a string, usually by glomming together
213 -- the class and tycon name -- but it doesn't matter exactly how;
214 -- this map then gives a unique int for each inst decl with that
215 -- string. (In Haskell 98 there can only be one,
216 -- but not so in more extended versions; also class CC type T
217 -- and class C type TT might both give the string CCT
219 -- We could just use one Int for all the instance decls, but this
220 -- way the uniques change less when you add an instance decl,
221 -- hence less recompilation
223 , FiniteMap (ModuleName, OccName) Name
224 -- Ensures that one (module,occname) pair gets one unique
225 , FiniteMap OccName Name
226 -- Ensures that one implicit parameter name gets one unique
230 --------------------------------
231 data ExportEnv = ExportEnv Avails Fixities [ModuleName]
232 -- The list of modules is the modules exported
233 -- with 'module M' in the export list
235 type Avails = [AvailInfo]
236 type Fixities = [(Name, Fixity)]
238 type ExportAvails = (FiniteMap ModuleName Avails,
239 -- Used to figure out "module M" export specifiers
240 -- Includes avails only from *unqualified* imports
241 -- (see 1.4 Report Section 5.1.1)
243 AvailEnv) -- Used to figure out all other export specifiers.
246 data GenAvailInfo name = Avail name -- An ordinary identifier
247 | AvailTC name -- The name of the type or class
248 [name] -- The available pieces of type/class.
249 -- NB: If the type or class is itself
250 -- to be in scope, it must be in this list.
251 -- Thus, typically: AvailTC Eq [Eq, ==, /=]
253 type AvailEnv = NameEnv AvailInfo -- Maps a Name to the AvailInfo that contains it
254 type AvailInfo = GenAvailInfo Name
255 type RdrAvailInfo = GenAvailInfo OccName
258 %===================================================
259 \subsubsection{ INTERFACE FILE STUFF}
260 %===================================================
263 type ExportItem = (ModuleName, [RdrAvailInfo])
264 type VersionInfo name = [ImportVersion name]
266 type ImportVersion name = (ModuleName, Version,
267 WhetherHasOrphans, IsBootInterface, WhatsImported name)
269 type WhetherHasOrphans = Bool
271 -- * an instance decl in a module other than the defn module for
272 -- one of the tycons or classes in the instance head
273 -- * a transformation rule in a module other than the one defining
274 -- the function in the head of the rule.
276 type IsBootInterface = Bool
278 data WhatsImported name = Everything
279 | Specifically [LocalVersion name] -- List guaranteed non-empty
281 -- ("M", hif, ver, Everything) means there was a "module M" in
282 -- this module's export list, so we just have to go by M's version, "ver",
283 -- not the list of LocalVersions.
286 type LocalVersion name = (name, Version)
290 pi_mod :: Version, -- Module version number
291 pi_orphan :: WhetherHasOrphans, -- Whether this module has orphans
292 pi_usages :: [ImportVersion OccName], -- Usages
293 pi_exports :: [ExportItem], -- Exports
294 pi_decls :: [(Version, RdrNameHsDecl)], -- Local definitions
295 pi_insts :: [RdrNameInstDecl], -- Local instance declarations
296 pi_rules :: [RdrNameRuleDecl], -- Rules
297 pi_deprecs :: [RdrNameDeprecation] -- Deprecations
300 data InterfaceDetails
301 = InterfaceDetails WhetherHasOrphans
302 (VersionInfo Name) -- Version information for what this module imports
303 ExportEnv -- What modules this one depends on
307 -- needed by Main to fish out the fixities assoc list.
308 getIfaceFixities :: InterfaceDetails -> Fixities
309 getIfaceFixities (InterfaceDetails _ _ (ExportEnv _ fs _) _) = fs
312 type RdrNamePragma = () -- Fudge for now
315 data Ifaces = Ifaces {
316 iImpModInfo :: ImportedModuleInfo,
317 -- Modules this one depends on: that is, the union
318 -- of the modules its *direct* imports depend on.
319 -- NB: The direct imports have .hi files that enumerate *all* the
320 -- dependencies (direct or not) of the imported module.
322 iDecls :: DeclsMap, -- A single, global map of Names to decls
324 iFixes :: FixityEnv, -- A single, global map of Names to fixities
325 -- See comments with RnIfaces.lookupFixity
328 -- All the names (whether "big" or "small", whether wired-in or not,
329 -- whether locally defined or not) that have been slurped in so far.
331 iVSlurp :: [(Name,Version)],
332 -- All the (a) non-wired-in (b) "big" (c) non-locally-defined
333 -- names that have been slurped in so far, with their versions.
334 -- This is used to generate the "usage" information for this module.
335 -- Subset of the previous field.
337 iInsts :: Bag GatedDecl,
338 -- The as-yet un-slurped instance decls; this bag is depleted when we
339 -- slurp an instance decl so that we don't slurp the same one twice.
340 -- Each is 'gated' by the names that must be available before
341 -- this instance decl is needed.
343 iRules :: Bag GatedDecl,
344 -- Ditto transformation rules
346 iDeprecs :: DeprecationEnv
349 type GatedDecl = (NameSet, (Module, RdrNameHsDecl))
351 type ImportedModuleInfo
352 = FiniteMap ModuleName (Version, WhetherHasOrphans, IsBootInterface, Maybe (Module, Avails))
353 -- Suppose the domain element is module 'A'
355 -- The first Bool is True if A contains
356 -- 'orphan' rules or instance decls
358 -- The second Bool is true if the interface file actually
359 -- read was an .hi-boot file
361 -- Nothing => A's interface not yet read, but this module has
362 -- imported a module, B, that itself depends on A
364 -- Just xx => A's interface has been read. The Module in
365 -- the Just has the correct Dll flag
367 -- This set is used to decide whether to look for
368 -- A.hi or A.hi-boot when importing A.f.
369 -- Basically, we look for A.hi if A is in the map, and A.hi-boot
372 type DeclsMap = NameEnv (Version, AvailInfo, Bool, (Module, RdrNameHsDecl))
373 -- A DeclsMap contains a binding for each Name in the declaration
374 -- including the constructors of a type decl etc.
375 -- The Bool is True just for the 'main' Name.
379 %************************************************************************
381 \subsection{Main monad code}
383 %************************************************************************
386 initRn :: ModuleName -> UniqSupply -> SearchPath -> SrcLoc
388 -> IO (r, Bag ErrMsg, Bag WarnMsg)
390 initRn mod us dirs loc do_rn = do
391 himaps <- mkModuleHiMaps dirs
392 names_var <- newIORef (us, emptyFM, builtins, emptyFM)
393 errs_var <- newIORef (emptyBag,emptyBag)
394 iface_var <- newIORef emptyIfaces
396 rn_down = RnDown { rn_loc = loc, rn_ns = names_var,
399 rn_ifaces = iface_var,
403 res <- do_rn rn_down ()
405 -- grab errors and return
406 (warns, errs) <- readIORef errs_var
408 return (res, errs, warns)
411 initRnMS :: GlobalRdrEnv -> FixityEnv -> RnMode -> RnMS r -> RnM d r
412 initRnMS rn_env fixity_env mode thing_inside rn_down g_down
414 s_down = SDown { rn_genv = rn_env, rn_lenv = emptyRdrEnv,
415 rn_fixenv = fixity_env, rn_mode = mode }
417 thing_inside rn_down s_down
419 initIfaceRnMS :: Module -> RnMS r -> RnM d r
420 initIfaceRnMS mod thing_inside
421 = initRnMS emptyRdrEnv emptyNameEnv InterfaceMode $
422 setModuleRn (moduleName mod) thing_inside
424 emptyIfaces :: Ifaces
425 emptyIfaces = Ifaces { iImpModInfo = emptyFM,
426 iDecls = emptyNameEnv,
427 iFixes = emptyNameEnv,
428 iSlurp = unitNameSet (mkUnboundName dummyRdrVarName),
429 -- Pretend that the dummy unbound name has already been
430 -- slurped. This is what's returned for an out-of-scope name,
431 -- and we don't want thereby to try to suck it in!
435 iDeprecs = emptyNameEnv
438 builtins :: FiniteMap (ModuleName,OccName) Name
441 mapBag (\ name -> ((moduleName (nameModule name), nameOccName name), name))
445 @renameSourceCode@ is used to rename stuff ``out-of-line'';
446 that is, not as part of the main renamer.
447 Sole examples: derived definitions,
448 which are only generated in the type checker.
450 The @RnNameSupply@ includes a @UniqueSupply@, so if you call it more than
451 once you must either split it, or install a fresh unique supply.
454 renameSourceCode :: ModuleName
459 renameSourceCode mod_name name_supply m
461 -- It's not really unsafe! When renaming source code we
462 -- only do any I/O if we need to read in a fixity declaration;
463 -- and that doesn't happen in pragmas etc
465 mkModuleHiMaps (mkSearchPath opt_HiMap) >>= \ himaps ->
466 newIORef name_supply >>= \ names_var ->
467 newIORef (emptyBag,emptyBag) >>= \ errs_var ->
469 rn_down = RnDown { rn_loc = mkGeneratedSrcLoc, rn_ns = names_var,
470 rn_errs = errs_var, rn_hi_maps = himaps,
472 rn_ifaces = panic "rnameSourceCode: rn_ifaces" -- Not required
474 s_down = SDown { rn_mode = InterfaceMode,
475 -- So that we can refer to PrelBase.True etc
476 rn_genv = emptyRdrEnv, rn_lenv = emptyRdrEnv,
477 rn_fixenv = emptyNameEnv }
479 m rn_down s_down >>= \ result ->
481 readIORef errs_var >>= \ (warns,errs) ->
483 (if not (isEmptyBag errs) then
484 pprTrace "Urk! renameSourceCode found errors" (display errs)
486 else if not (isEmptyBag warns) then
487 pprTrace "Note: renameSourceCode found warnings" (display warns)
495 display errs = pprBagOfErrors errs
497 {-# INLINE thenRn #-}
498 {-# INLINE thenRn_ #-}
499 {-# INLINE returnRn #-}
502 returnRn :: a -> RnM d a
503 thenRn :: RnM d a -> (a -> RnM d b) -> RnM d b
504 thenRn_ :: RnM d a -> RnM d b -> RnM d b
505 andRn :: (a -> a -> a) -> RnM d a -> RnM d a -> RnM d a
506 mapRn :: (a -> RnM d b) -> [a] -> RnM d [b]
507 mapRn_ :: (a -> RnM d b) -> [a] -> RnM d ()
508 mapMaybeRn :: (a -> RnM d (Maybe b)) -> [a] -> RnM d [b]
509 flatMapRn :: (a -> RnM d [b]) -> [a] -> RnM d [b]
510 sequenceRn :: [RnM d a] -> RnM d [a]
511 foldlRn :: (b -> a -> RnM d b) -> b -> [a] -> RnM d b
512 mapAndUnzipRn :: (a -> RnM d (b,c)) -> [a] -> RnM d ([b],[c])
513 fixRn :: (a -> RnM d a) -> RnM d a
515 returnRn v gdown ldown = return v
516 thenRn m k gdown ldown = m gdown ldown >>= \ r -> k r gdown ldown
517 thenRn_ m k gdown ldown = m gdown ldown >> k gdown ldown
518 fixRn m gdown ldown = fixIO (\r -> m r gdown ldown)
519 andRn combiner m1 m2 gdown ldown
520 = m1 gdown ldown >>= \ res1 ->
521 m2 gdown ldown >>= \ res2 ->
522 return (combiner res1 res2)
524 sequenceRn [] = returnRn []
525 sequenceRn (m:ms) = m `thenRn` \ r ->
526 sequenceRn ms `thenRn` \ rs ->
529 mapRn f [] = returnRn []
531 = f x `thenRn` \ r ->
532 mapRn f xs `thenRn` \ rs ->
535 mapRn_ f [] = returnRn ()
540 foldlRn k z [] = returnRn z
541 foldlRn k z (x:xs) = k z x `thenRn` \ z' ->
544 mapAndUnzipRn f [] = returnRn ([],[])
545 mapAndUnzipRn f (x:xs)
546 = f x `thenRn` \ (r1, r2) ->
547 mapAndUnzipRn f xs `thenRn` \ (rs1, rs2) ->
548 returnRn (r1:rs1, r2:rs2)
550 mapAndUnzip3Rn f [] = returnRn ([],[],[])
551 mapAndUnzip3Rn f (x:xs)
552 = f x `thenRn` \ (r1, r2, r3) ->
553 mapAndUnzip3Rn f xs `thenRn` \ (rs1, rs2, rs3) ->
554 returnRn (r1:rs1, r2:rs2, r3:rs3)
556 mapMaybeRn f [] = returnRn []
557 mapMaybeRn f (x:xs) = f x `thenRn` \ maybe_r ->
558 mapMaybeRn f xs `thenRn` \ rs ->
560 Nothing -> returnRn rs
561 Just r -> returnRn (r:rs)
563 flatMapRn f [] = returnRn []
564 flatMapRn f (x:xs) = f x `thenRn` \ r ->
565 flatMapRn f xs `thenRn` \ rs ->
571 %************************************************************************
573 \subsection{Boring plumbing for common part}
575 %************************************************************************
579 \subsubsection{ Errors and warnings}
580 %=====================
583 failWithRn :: a -> Message -> RnM d a
584 failWithRn res msg (RnDown {rn_errs = errs_var, rn_loc = loc}) l_down
585 = readIORef errs_var >>= \ (warns,errs) ->
586 writeIORef errs_var (warns, errs `snocBag` err) >>
589 err = addShortErrLocLine loc msg
591 warnWithRn :: a -> Message -> RnM d a
592 warnWithRn res msg (RnDown {rn_errs = errs_var, rn_loc = loc}) l_down
593 = readIORef errs_var >>= \ (warns,errs) ->
594 writeIORef errs_var (warns `snocBag` warn, errs) >>
597 warn = addShortWarnLocLine loc msg
599 addErrRn :: Message -> RnM d ()
600 addErrRn err = failWithRn () err
602 checkRn :: Bool -> Message -> RnM d () -- Check that a condition is true
603 checkRn False err = addErrRn err
604 checkRn True err = returnRn ()
606 warnCheckRn :: Bool -> Message -> RnM d () -- Check that a condition is true
607 warnCheckRn False err = addWarnRn err
608 warnCheckRn True err = returnRn ()
610 addWarnRn :: Message -> RnM d ()
611 addWarnRn warn = warnWithRn () warn
613 checkErrsRn :: RnM d Bool -- True <=> no errors so far
614 checkErrsRn (RnDown {rn_errs = errs_var}) l_down
615 = readIORef errs_var >>= \ (warns,errs) ->
616 return (isEmptyBag errs)
621 \subsubsection{ Source location}
622 %=====================
625 pushSrcLocRn :: SrcLoc -> RnM d a -> RnM d a
626 pushSrcLocRn loc' m down l_down
627 = m (down {rn_loc = loc'}) l_down
629 getSrcLocRn :: RnM d SrcLoc
630 getSrcLocRn down l_down
631 = return (rn_loc down)
635 \subsubsection{ Name supply}
636 %=====================
639 getNameSupplyRn :: RnM d RnNameSupply
640 getNameSupplyRn rn_down l_down
641 = readIORef (rn_ns rn_down)
643 setNameSupplyRn :: RnNameSupply -> RnM d ()
644 setNameSupplyRn names' (RnDown {rn_ns = names_var}) l_down
645 = writeIORef names_var names'
647 -- See comments with RnNameSupply above.
648 newInstUniq :: String -> RnM d Int
649 newInstUniq key (RnDown {rn_ns = names_var}) l_down
650 = readIORef names_var >>= \ (us, mapInst, cache, ipcache) ->
652 uniq = case lookupFM mapInst key of
655 mapInst' = addToFM mapInst key uniq
657 writeIORef names_var (us, mapInst', cache, ipcache) >>
660 getUniqRn :: RnM d Unique
661 getUniqRn (RnDown {rn_ns = names_var}) l_down
662 = readIORef names_var >>= \ (us, mapInst, cache, ipcache) ->
664 (us1,us') = splitUniqSupply us
666 writeIORef names_var (us', mapInst, cache, ipcache) >>
667 return (uniqFromSupply us1)
671 \subsubsection{ Module}
672 %=====================
675 getModuleRn :: RnM d ModuleName
676 getModuleRn (RnDown {rn_mod = mod_name}) l_down
679 setModuleRn :: ModuleName -> RnM d a -> RnM d a
680 setModuleRn new_mod enclosed_thing rn_down l_down
681 = enclosed_thing (rn_down {rn_mod = new_mod}) l_down
685 %************************************************************************
687 \subsection{Plumbing for rename-source part}
689 %************************************************************************
692 \subsubsection{ RnEnv}
693 %=====================
696 getNameEnvs :: RnMS (GlobalRdrEnv, LocalRdrEnv)
697 getNameEnvs rn_down (SDown {rn_genv = global_env, rn_lenv = local_env})
698 = return (global_env, local_env)
700 getLocalNameEnv :: RnMS LocalRdrEnv
701 getLocalNameEnv rn_down (SDown {rn_lenv = local_env})
704 setLocalNameEnv :: LocalRdrEnv -> RnMS a -> RnMS a
705 setLocalNameEnv local_env' m rn_down l_down
706 = m rn_down (l_down {rn_lenv = local_env'})
708 getFixityEnv :: RnMS FixityEnv
709 getFixityEnv rn_down (SDown {rn_fixenv = fixity_env})
712 extendFixityEnv :: [(Name, RenamedFixitySig)] -> RnMS a -> RnMS a
713 extendFixityEnv fixes enclosed_scope
714 rn_down l_down@(SDown {rn_fixenv = fixity_env})
716 new_fixity_env = extendNameEnv fixity_env fixes
718 enclosed_scope rn_down (l_down {rn_fixenv = new_fixity_env})
722 \subsubsection{ Mode}
723 %=====================
726 getModeRn :: RnMS RnMode
727 getModeRn rn_down (SDown {rn_mode = mode})
730 setModeRn :: RnMode -> RnMS a -> RnMS a
731 setModeRn new_mode thing_inside rn_down l_down
732 = thing_inside rn_down (l_down {rn_mode = new_mode})
736 %************************************************************************
738 \subsection{Plumbing for rename-globals part}
740 %************************************************************************
743 getIfacesRn :: RnM d Ifaces
744 getIfacesRn (RnDown {rn_ifaces = iface_var}) _
745 = readIORef iface_var
747 setIfacesRn :: Ifaces -> RnM d ()
748 setIfacesRn ifaces (RnDown {rn_ifaces = iface_var}) _
749 = writeIORef iface_var ifaces
751 getHiMaps :: RnM d (ModuleHiMap, ModuleHiMap)
752 getHiMaps (RnDown {rn_hi_maps = himaps}) _
757 lookupModuleRn :: ModuleName -> RnM d Module
759 getHiMaps `thenRn` \ (himap, _) ->
760 case lookupFM himap x of
761 Nothing -> returnRn (mkVanillaModule x)
762 Just (_,x) -> returnRn x