2 % (c) The GRASP/AQUA Project, Glasgow University, 1993-1998
4 \section[MkIface]{Print an interface for a module}
8 startIface, endIface, ifaceDecls
11 #include "HsVersions.h"
13 import IO ( Handle, hPutStr, openFile,
14 hClose, hPutStrLn, IOMode(..) )
17 import BasicTypes ( Fixity(..), FixityDirection(..), NewOrData(..),
18 OccInfo, isLoopBreaker
21 import RnEnv ( availName )
23 import TcInstUtil ( InstInfo(..) )
26 import Id ( Id, idType, idInfo, omitIfaceSigForId, isUserExportedId,
31 import DataCon ( StrictnessMark(..), dataConSig, dataConFieldLabels, dataConStrictMarks )
32 import IdInfo ( IdInfo, StrictnessInfo(..), ArityInfo, InlinePragInfo(..), inlinePragInfo,
33 arityInfo, ppArityInfo, arityLowerBound,
34 strictnessInfo, ppStrictnessInfo, isBottomingStrictness,
35 cafInfo, ppCafInfo, specInfo,
36 cprInfo, ppCprInfo, pprInlinePragInfo,
37 occInfo, isNeverInlinePrag,
38 workerExists, workerInfo, ppWorkerInfo, WorkerInfo(..)
40 import CoreSyn ( CoreExpr, CoreBind, Bind(..), rulesRules, rulesRhsFreeVars )
41 import CoreFVs ( exprSomeFreeVars, ruleSomeLhsFreeVars, ruleSomeFreeVars )
42 import CoreUnfold ( okToUnfoldInHiFile, couldBeSmallEnoughToInline )
43 import Module ( moduleString, pprModule, pprModuleName )
44 import Name ( isLocallyDefined, isWiredInName, nameRdrName, nameModule,
47 import OccName ( OccName, pprOccName )
48 import TyCon ( TyCon, getSynTyConDefn, isSynTyCon, isNewTyCon, isAlgTyCon,
49 tyConTheta, tyConTyVars, tyConDataCons
51 import Class ( Class, classExtraBigSig )
52 import FieldLabel ( fieldLabelName, fieldLabelType )
53 import Type ( mkSigmaTy, splitSigmaTy, mkDictTy, tidyTopType,
54 deNoteType, classesToPreds,
55 Type, ThetaType, PredType(..), ClassContext
59 import PprCore ( pprIfaceUnfolding, pprCoreRule )
60 import FunDeps ( pprFundeps )
61 import Rules ( pprProtoCoreRule, ProtoCoreRule(..) )
63 import Bag ( bagToList, isEmptyBag )
64 import Maybes ( catMaybes, maybeToBool )
65 import FiniteMap ( emptyFM, addToFM, addToFM_C, fmToList, FiniteMap )
66 import UniqFM ( lookupUFM, listToUFM )
67 import UniqSet ( uniqSetToList )
68 import Util ( sortLt, mapAccumL )
73 We have a function @startIface@ to open the output file and put
74 (something like) ``interface Foo'' in it. It gives back a handle
75 for subsequent additions to the interface file.
77 We then have one-function-per-block-of-interface-stuff, e.g.,
78 @ifaceExportList@ produces the @__exports__@ section; it appends
79 to the handle provided by @startIface@.
81 NOTE: ALWAYS remember that ghc-iface.lprl rewrites the interface file,
82 so you have to keep it in synch with the code below. Otherwise you'll
83 lose the happiest years of your life, believe me... -- SUP
86 startIface :: Module -> InterfaceDetails
87 -> IO (Maybe Handle) -- Nothing <=> don't do an interface
89 ifaceDecls :: Maybe Handle
92 -> [Id] -- Ids used at code-gen time; they have better pragma info!
93 -> [CoreBind] -- In dependency order, later depend on earlier
94 -> [ProtoCoreRule] -- Rules
98 endIface :: Maybe Handle -> IO ()
102 startIface mod (InterfaceDetails has_orphans import_usages (ExportEnv avails fixities _) _)
103 = case opt_ProduceHi of
104 Nothing -> return Nothing ; -- not producing any .hi file
107 if_hdl <- openFile fn WriteMode
108 hPutStr if_hdl ("__interface \"" ++ show opt_InPackage ++ "\" " ++ moduleString mod)
109 hPutStr if_hdl (' ' : orphan_indicator)
110 hPutStrLn if_hdl " where"
111 ifaceExports if_hdl avails
112 ifaceImports if_hdl import_usages
113 ifaceFixities if_hdl fixities
116 orphan_indicator | has_orphans = " !"
119 endIface Nothing = return ()
120 endIface (Just if_hdl) = hPutStr if_hdl "\n" >> hClose if_hdl
125 ifaceDecls Nothing tycons classes inst_info final_ids simplified rules _ = return ()
126 ifaceDecls (Just hdl)
131 orphan_rules -- Rules defined locally for an Id that is *not* defined locally
133 | null_decls = return ()
134 -- You could have a module with just (re-)exports/instances in it
136 = ifaceClasses hdl classes >>
137 ifaceInstances hdl inst_infos >>= \ inst_ids ->
138 ifaceTyCons hdl tycons >>
139 ifaceBinds hdl (inst_ids `unionVarSet` orphan_rule_ids)
140 final_ids binds >>= \ emitted_ids ->
141 ifaceRules hdl orphan_rules emitted_ids >>
142 ifaceDeprecations hdl deprecations
144 orphan_rule_ids = unionVarSets [ ruleSomeFreeVars interestingId rule
145 | ProtoCoreRule _ _ rule <- orphan_rules]
147 null_decls = null binds &&
150 isEmptyBag inst_infos &&
156 ifaceImports :: Handle -> VersionInfo Name -> IO ()
157 ifaceImports if_hdl import_usages
158 = hPutCol if_hdl upp_uses (sortLt lt_imp_vers import_usages)
160 upp_uses (m, mv, has_orphans, is_boot, whats_imported)
161 = hsep [ptext SLIT("import"), pprModuleName m,
162 int mv, pp_orphan, pp_boot,
163 upp_import_versions whats_imported
166 pp_orphan | has_orphans = ptext SLIT("!")
168 pp_boot | is_boot = ptext SLIT("@")
171 -- Importing the whole module is indicated by an empty list
172 upp_import_versions Everything = empty
174 -- For imported versions we do print the version number
175 upp_import_versions (Specifically nvs)
176 = dcolon <+> hsep [ hsep [ppr_unqual_name n, int v] | (n,v) <- sort_versions nvs ]
178 {- SUP: What's this??
179 ifaceModuleDeps if_hdl [] = return ()
180 ifaceModuleDeps if_hdl mod_deps
182 lines = map ppr_mod_dep mod_deps
183 ppr_mod_dep (mod, contains_orphans)
184 | contains_orphans = pprModuleName mod <+> ptext SLIT("!")
185 | otherwise = pprModuleName mod
187 printForIface if_hdl (ptext SLIT("__depends") <+> vcat lines <> ptext SLIT(" ;")) >>
191 ifaceExports :: Handle -> Avails -> IO ()
192 ifaceExports if_hdl [] = return ()
193 ifaceExports if_hdl avails
194 = hPutCol if_hdl do_one_module (fmToList export_fm)
196 -- Sort them into groups by module
197 export_fm :: FiniteMap Module [AvailInfo]
198 export_fm = foldr insert emptyFM avails
200 insert avail efm = addToFM_C (++) efm mod [avail]
202 mod = nameModule (availName avail)
204 -- Print one module's worth of stuff
205 do_one_module :: (Module, [AvailInfo]) -> SDoc
206 do_one_module (mod_name, avails@(avail1:_))
207 = ptext SLIT("__export ") <>
208 hsep [pprModule mod_name,
209 hsep (map upp_avail (sortLt lt_avail avails))
212 ifaceFixities :: Handle -> Fixities -> IO ()
213 ifaceFixities if_hdl [] = return ()
214 ifaceFixities if_hdl fixities
215 = hPutCol if_hdl upp_fixity fixities
217 ifaceRules :: Handle -> [ProtoCoreRule] -> IdSet -> IO ()
218 ifaceRules if_hdl rules emitted
219 | opt_OmitInterfacePragmas -- Don't emit rules if we are suppressing
221 || (null orphan_rule_pretties && null local_id_pretties)
224 = printForIface if_hdl (vcat [
225 ptext SLIT("{-## __R"),
226 vcat orphan_rule_pretties,
227 vcat local_id_pretties,
231 orphan_rule_pretties = [ pprCoreRule (Just fn) rule
232 | ProtoCoreRule _ fn rule <- rules
234 local_id_pretties = [ pprCoreRule (Just fn) rule
235 | fn <- varSetElems emitted,
236 rule <- rulesRules (idSpecialisation fn),
237 all (`elemVarSet` emitted) (varSetElems (ruleSomeLhsFreeVars interestingId rule))
238 -- Spit out a rule only if all its lhs free vars are emitted
239 -- This is a good reason not to do it when we emit the Id itself
242 ifaceDeprecations :: Handle -> [Deprecation Name] -> IO ()
243 ifaceDeprecations if_hdl [] = return ()
244 ifaceDeprecations if_hdl deprecations
245 = printForIface if_hdl (vcat [
246 ptext SLIT("{-## __D"),
247 vcat [ pprIE ie <+> doubleQuotes (ppr txt) <> semi | Deprecation ie txt <- deprecations ],
251 pprIE (IEVar n ) = ppr n
252 pprIE (IEThingAbs n ) = ppr n
253 pprIE (IEThingAll n ) = hcat [ppr n, text "(..)"]
254 pprIE (IEThingWith n ns) = ppr n <> parens (hcat (punctuate comma (map ppr ns)))
255 pprIE (IEModuleContents _ ) = empty
258 %************************************************************************
260 \subsection{Instance declarations}
262 %************************************************************************
266 ifaceInstances :: Handle -> Bag InstInfo -> IO IdSet -- The IdSet is the needed dfuns
267 ifaceInstances if_hdl inst_infos
268 | null togo_insts = return emptyVarSet
269 | otherwise = hPutCol if_hdl pp_inst (sortLt lt_inst togo_insts) >>
272 togo_insts = filter is_togo_inst (bagToList inst_infos)
273 needed_ids = mkVarSet [dfun_id | InstInfo _ _ _ _ dfun_id _ _ _ <- togo_insts]
274 is_togo_inst (InstInfo _ _ _ _ dfun_id _ _ _) = isLocallyDefined dfun_id
277 lt_inst (InstInfo _ _ _ _ dfun_id1 _ _ _)
278 (InstInfo _ _ _ _ dfun_id2 _ _ _)
279 = getOccName dfun_id1 < getOccName dfun_id2
280 -- The dfuns are assigned names df1, df2, etc, in order of original textual
281 -- occurrence, and this makes as good a sort order as any
284 pp_inst (InstInfo clas tvs tys theta dfun_id _ _ _)
286 -- The deNoteType is very important. It removes all type
287 -- synonyms from the instance type in interface files.
288 -- That in turn makes sure that when reading in instance decls
289 -- from interface files that the 'gating' mechanism works properly.
290 -- Otherwise you could have
291 -- type Tibble = T Int
292 -- instance Foo Tibble where ...
293 -- and this instance decl wouldn't get imported into a module
294 -- that mentioned T but not Tibble.
295 forall_ty = mkSigmaTy tvs (classesToPreds theta)
296 (deNoteType (mkDictTy clas tys))
297 renumbered_ty = tidyTopType forall_ty
299 hcat [ptext SLIT("instance "), pprType renumbered_ty,
300 ptext SLIT(" = "), ppr_unqual_name dfun_id, semi]
304 %************************************************************************
306 \subsection{Printing values}
308 %************************************************************************
311 ifaceId :: (Id -> IdInfo) -- This function "knows" the extra info added
312 -- by the STG passes. Sigh
314 -> IdSet -- Set of Ids that are needed by earlier interface
315 -- file emissions. If the Id isn't in this set, and isn't
316 -- exported, there's no need to emit anything
317 -> Bool -- True <=> recursive, so don't print unfolding
319 -> CoreExpr -- The Id's right hand side
320 -> Maybe (SDoc, IdSet) -- The emitted stuff, plus any *extra* needed Ids
322 ifaceId get_idinfo needed_ids is_rec id rhs
323 | not (id `elemVarSet` needed_ids || -- Needed [no id in needed_ids has omitIfaceSigForId]
324 (isUserExportedId id && not (omitIfaceSigForId id))) -- or exported and not to be omitted
325 = Nothing -- Well, that was easy!
327 ifaceId get_idinfo needed_ids is_rec id rhs
328 = ASSERT2( arity_matches_strictness, ppr id )
329 Just (hsep [sig_pretty, prag_pretty, char ';'], new_needed_ids)
331 core_idinfo = idInfo id
332 stg_idinfo = get_idinfo id
334 ty_pretty = pprType (idType id)
335 sig_pretty = hsep [ppr (getOccName id), dcolon, ty_pretty]
338 | opt_OmitInterfacePragmas = empty
339 | otherwise = hsep [ptext SLIT("{-##"),
348 ------------ Arity --------------
349 arity_info = arityInfo stg_idinfo
350 arity_pretty = ppArityInfo arity_info
352 ------------ Caf Info --------------
353 caf_pretty = ppCafInfo (cafInfo stg_idinfo)
355 ------------ CPR Info --------------
356 cpr_pretty = ppCprInfo (cprInfo core_idinfo)
358 ------------ Strictness --------------
359 strict_info = strictnessInfo core_idinfo
360 bottoming_fn = isBottomingStrictness strict_info
361 strict_pretty = ppStrictnessInfo strict_info
363 ------------ Worker --------------
364 work_info = workerInfo core_idinfo
365 has_worker = workerExists work_info
366 wrkr_pretty = ppWorkerInfo work_info
367 HasWorker work_id wrap_arity = work_info
370 ------------ Occ info --------------
371 loop_breaker = isLoopBreaker (occInfo core_idinfo)
373 ------------ Unfolding --------------
374 inline_pragma = inlinePragInfo core_idinfo
375 dont_inline = isNeverInlinePrag inline_pragma
377 unfold_pretty | show_unfold = ptext SLIT("__U") <> pprInlinePragInfo inline_pragma <+> pprIfaceUnfolding rhs
380 show_unfold = not has_worker && -- Not unnecessary
381 not bottoming_fn && -- Not necessary
384 rhs_is_small && -- Small enough
385 okToUnfoldInHiFile rhs -- No casms etc
387 rhs_is_small = couldBeSmallEnoughToInline opt_UF_HiFileThreshold rhs
389 ------------ Specialisations --------------
390 spec_info = specInfo core_idinfo
392 ------------ Extra free Ids --------------
393 new_needed_ids | opt_OmitInterfacePragmas = emptyVarSet
394 | otherwise = worker_ids `unionVarSet`
395 unfold_ids `unionVarSet`
398 worker_ids | has_worker && interestingId work_id = unitVarSet work_id
399 -- Conceivably, the worker might come from
401 | otherwise = emptyVarSet
403 spec_ids = filterVarSet interestingId (rulesRhsFreeVars spec_info)
405 unfold_ids | show_unfold = find_fvs rhs
406 | otherwise = emptyVarSet
408 find_fvs expr = exprSomeFreeVars interestingId expr
410 ------------ Sanity checking --------------
411 -- The arity of a wrapper function should match its strictness,
412 -- or else an importing module will get very confused indeed.
413 arity_matches_strictness = not has_worker ||
414 wrap_arity == arityLowerBound arity_info
416 interestingId id = isId id && isLocallyDefined id &&
417 not (omitIfaceSigForId id)
422 -> IdSet -- These Ids are needed already
423 -> [Id] -- Ids used at code-gen time; they have better pragma info!
424 -> [CoreBind] -- In dependency order, later depend on earlier
425 -> IO IdSet -- Set of Ids actually spat out
427 ifaceBinds hdl needed_ids final_ids binds
428 = mapIO (printForIface hdl) (bagToList pretties) >>
432 final_id_map = listToUFM [(id,id) | id <- final_ids]
433 get_idinfo id = case lookupUFM final_id_map id of
434 Just id' -> idInfo id'
435 Nothing -> pprTrace "ifaceBinds not found:" (ppr id) $
438 (pretties, emitted) = go needed_ids (reverse binds) emptyBag emptyVarSet
439 -- Reverse so that later things will
440 -- provoke earlier ones to be emitted
441 go needed [] pretties emitted
442 | not (isEmptyVarSet needed) = pprTrace "ifaceBinds: free vars:"
443 (sep (map ppr (varSetElems needed)))
445 | otherwise = (pretties, emitted)
447 go needed (NonRec id rhs : binds) pretties emitted
448 = case ifaceId get_idinfo needed False id rhs of
449 Nothing -> go needed binds pretties emitted
450 Just (pretty, extras) -> let
451 needed' = (needed `unionVarSet` extras) `delVarSet` id
452 -- 'extras' can include the Id itself via a rule
453 emitted' = emitted `extendVarSet` id
455 go needed' binds (pretty `consBag` pretties) emitted'
457 -- Recursive groups are a bit more of a pain. We may only need one to
458 -- start with, but it may call out the next one, and so on. So we
459 -- have to look for a fixed point.
460 go needed (Rec pairs : binds) pretties emitted
461 = go needed' binds pretties' emitted'
463 (new_pretties, new_emitted, extras) = go_rec needed pairs
464 pretties' = new_pretties `unionBags` pretties
465 needed' = (needed `unionVarSet` extras) `minusVarSet` mkVarSet (map fst pairs)
466 emitted' = emitted `unionVarSet` new_emitted
468 go_rec :: IdSet -> [(Id,CoreExpr)] -> (Bag SDoc, IdSet, IdSet)
470 | null pretties = (emptyBag, emptyVarSet, emptyVarSet)
471 | otherwise = (more_pretties `unionBags` listToBag pretties,
472 more_emitted `unionVarSet` mkVarSet emitted,
473 more_extras `unionVarSet` extras)
475 maybes = map do_one pairs
476 emitted = [id | ((id,_), Just _) <- pairs `zip` maybes]
477 reduced_pairs = [pair | (pair, Nothing) <- pairs `zip` maybes]
478 (pretties, extras_s) = unzip (catMaybes maybes)
479 extras = unionVarSets extras_s
480 (more_pretties, more_emitted, more_extras) = go_rec extras reduced_pairs
482 do_one (id,rhs) = ifaceId get_idinfo needed True id rhs
486 %************************************************************************
488 \subsection{Random small things}
490 %************************************************************************
493 ifaceTyCons hdl tycons = hPutCol hdl upp_tycon (sortLt (<) (filter (for_iface_name . getName) tycons))
494 ifaceClasses hdl classes = hPutCol hdl upp_class (sortLt (<) (filter (for_iface_name . getName) classes))
496 for_iface_name name = isLocallyDefined name &&
497 not (isWiredInName name)
499 upp_tycon tycon = ifaceTyCon tycon
500 upp_class clas = ifaceClass clas
505 ifaceTyCon :: TyCon -> SDoc
508 = hsep [ ptext SLIT("type"),
510 pprTyVarBndrs tyvars,
516 (tyvars, ty) = getSynTyConDefn tycon
520 = hsep [ ptext keyword,
521 ppr_decl_class_context (tyConTheta tycon),
523 pprTyVarBndrs (tyConTyVars tycon),
525 hsep (punctuate (ptext SLIT(" | ")) (map ppr_con (tyConDataCons tycon))),
529 keyword | isNewTyCon tycon = SLIT("newtype")
530 | otherwise = SLIT("data")
532 tyvars = tyConTyVars tycon
536 = ASSERT( tycon == tycon1 && tyvars == tyvars1 )
537 hsep [ ppr_ex ex_tyvars ex_theta,
539 hsep (map ppr_arg_ty (strict_marks `zip` arg_tys))
543 = hsep [ ppr_ex ex_tyvars ex_theta,
545 braces $ hsep $ punctuate comma (map ppr_field (strict_marks `zip` field_labels))
548 (tyvars1, _, ex_tyvars, ex_theta, arg_tys, tycon1) = dataConSig data_con
549 field_labels = dataConFieldLabels data_con
550 strict_marks = dataConStrictMarks data_con
551 name = getName data_con
553 ppr_ex [] ex_theta = ASSERT( null ex_theta ) empty
554 ppr_ex ex_tvs ex_theta = ptext SLIT("__forall") <+> brackets (pprTyVarBndrs ex_tvs)
555 <+> pprIfaceClasses ex_theta <+> ptext SLIT("=>")
557 ppr_arg_ty (strict_mark, ty) = ppr_strict_mark strict_mark <> pprParendType ty
559 ppr_strict_mark NotMarkedStrict = empty
560 ppr_strict_mark (MarkedUnboxed _ _) = ptext SLIT("! ! ")
561 ppr_strict_mark MarkedStrict = ptext SLIT("! ")
563 ppr_field (strict_mark, field_label)
564 = hsep [ ppr (fieldLabelName field_label),
566 ppr_strict_mark strict_mark <> pprParendType (fieldLabelType field_label)
570 = pprPanic "pprIfaceTyDecl" (ppr tycon)
573 = hsep [ptext SLIT("class"),
574 ppr_decl_class_context sc_theta,
575 ppr clas, -- Print the name
576 pprTyVarBndrs clas_tyvars,
582 (clas_tyvars, clas_fds, sc_theta, _, op_stuff) = classExtraBigSig clas
584 pp_ops | null op_stuff = empty
585 | otherwise = hsep [ptext SLIT("where"),
586 braces (hsep (punctuate semi (map ppr_classop op_stuff)))
589 ppr_classop (sel_id, dm_id, explicit_dm)
590 = ASSERT( sel_tyvars == clas_tyvars)
591 hsep [ppr (getOccName sel_id),
592 if explicit_dm then equals else empty,
597 (sel_tyvars, _, op_ty) = splitSigmaTy (idType sel_id)
599 ppr_decl_context :: ThetaType -> SDoc
600 ppr_decl_context [] = empty
601 ppr_decl_context theta = pprIfaceTheta theta <+> ptext SLIT(" =>")
603 ppr_decl_class_context :: ClassContext -> SDoc
604 ppr_decl_class_context [] = empty
605 ppr_decl_class_context ctxt = pprIfaceClasses ctxt <+> ptext SLIT(" =>")
607 pprIfaceTheta :: ThetaType -> SDoc -- Use braces rather than parens in interface files
608 pprIfaceTheta [] = empty
609 pprIfaceTheta theta = braces (hsep (punctuate comma [pprIfacePred p | p <- theta]))
611 -- ZZ - not sure who uses this - i.e. whether IParams really show up or not
612 -- (it's not used to print normal value signatures)
613 pprIfacePred :: PredType -> SDoc
614 pprIfacePred (Class clas tys) = pprConstraint clas tys
615 pprIfacePred (IParam n ty) = char '?' <> ppr n <+> ptext SLIT("::") <+> ppr ty
617 pprIfaceClasses :: ClassContext -> SDoc
618 pprIfaceClasses [] = empty
619 pprIfaceClasses theta = braces (hsep (punctuate comma [pprConstraint c tys | (c,tys) <- theta]))
622 %************************************************************************
624 \subsection{Random small things}
626 %************************************************************************
628 When printing export lists, we print like this:
630 AvailTC C [C, x, y] C(x,y)
631 AvailTC C [x, y] C!(x,y) -- Exporting x, y but not C
634 upp_avail :: AvailInfo -> SDoc
635 upp_avail (Avail name) = pprOccName (getOccName name)
636 upp_avail (AvailTC name []) = empty
637 upp_avail (AvailTC name ns) = hcat [pprOccName (getOccName name), bang, upp_export ns']
639 bang | name `elem` ns = empty
640 | otherwise = char '|'
641 ns' = filter (/= name) ns
643 upp_export :: [Name] -> SDoc
644 upp_export [] = empty
645 upp_export names = braces (hsep (map (pprOccName . getOccName) names))
647 upp_fixity :: (Name, Fixity) -> SDoc
648 upp_fixity (name, fixity) = hsep [ptext SLIT("0"), ppr fixity, ppr name, semi]
649 -- Dummy version number!
651 ppr_unqual_name :: NamedThing a => a -> SDoc -- Just its occurrence name
652 ppr_unqual_name name = pprOccName (getOccName name)
656 %************************************************************************
658 \subsection{Comparisons}
660 %************************************************************************
663 The various sorts above simply prevent unnecessary "wobbling" when
664 things change that don't have to. We therefore compare lexically, not
668 lt_avail :: AvailInfo -> AvailInfo -> Bool
670 a1 `lt_avail` a2 = availName a1 `lt_name` availName a2
672 lt_name :: Name -> Name -> Bool
673 n1 `lt_name` n2 = nameRdrName n1 < nameRdrName n2
675 lt_lexical :: NamedThing a => a -> a -> Bool
676 lt_lexical a1 a2 = getName a1 `lt_name` getName a2
678 lt_imp_vers :: ImportVersion a -> ImportVersion a -> Bool
679 lt_imp_vers (m1,_,_,_,_) (m2,_,_,_,_) = m1 < m2
681 sort_versions vs = sortLt lt_vers vs
683 lt_vers :: LocalVersion Name -> LocalVersion Name -> Bool
684 lt_vers (n1,v1) (n2,v2) = n1 `lt_name` n2
693 hPutCol hdl fmt xs = mapIO (printForIface hdl . fmt) xs
695 mapIO :: (a -> IO b) -> [a] -> IO ()
696 mapIO f [] = return ()
697 mapIO f (x:xs) = f x >> mapIO f xs