2 % (c) The GRASP/AQUA Project, Glasgow University, 1993-1996
4 \section[MkIface]{Print an interface for a module}
13 #include "HsVersions.h"
15 import IO ( Handle, hPutStr, openFile,
16 hClose, hPutStrLn, IOMode(..) )
19 import RdrHsSyn ( RdrName(..) )
20 import RnHsSyn ( RenamedHsModule )
21 import BasicTypes ( Fixity(..), FixityDirection(..), NewOrData(..), IfaceFlavour(..),
25 import RnEnv ( availName, ifaceFlavour )
27 import TcInstUtil ( InstInfo(..) )
28 import WorkWrap ( getWorkerIdAndCons )
31 import Id ( idType, dataConRawArgTys, dataConFieldLabels,
32 idInfo, omitIfaceSigForId,
33 dataConStrictMarks, StrictnessMark(..),
34 IdSet, idSetToList, unionIdSets, unitIdSet, minusIdSet,
35 isEmptyIdSet, elementOfIdSet, emptyIdSet, mkIdSet,
36 pprId, getIdSpecialisation,
39 import IdInfo ( IdInfo, StrictnessInfo, ArityInfo, InlinePragInfo(..), inlinePragInfo,
40 arityInfo, ppArityInfo, strictnessInfo, ppStrictnessInfo,
41 bottomIsGuaranteed, workerExists,
43 import CoreSyn ( CoreExpr, CoreBinding, GenCoreExpr, GenCoreBinding(..) )
44 import CoreUnfold ( calcUnfoldingGuidance, UnfoldingGuidance(..), Unfolding,
47 import FreeVars ( exprFreeVars )
48 import Name ( isLocallyDefined, isWiredInName, modAndOcc, nameModule, pprOccName,
49 OccName, occNameString, nameOccName, nameString, isExported,
50 Name {-instance NamedThing-}, Provenance, NamedThing(..)
52 import TyCon ( TyCon, getSynTyConDefn, isSynTyCon, isNewTyCon, isAlgTyCon,
53 tyConTheta, tyConTyVars, tyConDataCons
55 import Class ( Class, classBigSig )
56 import SpecEnv ( specEnvToList )
57 import FieldLabel ( fieldLabelName, fieldLabelType )
58 import Type ( mkSigmaTy, splitSigmaTy, mkDictTy,
59 mkTyVarTys, Type, ThetaType
62 import PprEnv -- not sure how much...
64 import PprCore ( pprIfaceUnfolding )
66 import Bag ( bagToList, isEmptyBag )
67 import Maybes ( catMaybes, maybeToBool )
68 import FiniteMap ( emptyFM, addToFM, addToFM_C, lookupFM, fmToList, eltsFM, FiniteMap )
69 import UniqFM ( UniqFM, lookupUFM, listToUFM )
70 import Util ( sortLt, zipWithEqual, zipWith3Equal, mapAccumL )
74 We have a function @startIface@ to open the output file and put
75 (something like) ``interface Foo'' in it. It gives back a handle
76 for subsequent additions to the interface file.
78 We then have one-function-per-block-of-interface-stuff, e.g.,
79 @ifaceExportList@ produces the @__exports__@ section; it appends
80 to the handle provided by @startIface@.
84 -> IO (Maybe Handle) -- Nothing <=> don't do an interface
86 ifaceMain :: Maybe Handle
91 ifaceDecls :: Maybe Handle
94 -> [Id] -- Ids used at code-gen time; they have better pragma info!
95 -> [CoreBinding] -- In dependency order, later depend on earlier
98 endIface :: Maybe Handle -> IO ()
103 = case opt_ProduceHi of
104 Nothing -> return Nothing -- not producing any .hi file
106 if_hdl <- openFile fn WriteMode
107 hPutStrLn if_hdl ("_interface_ "++ _UNPK_ mod ++ ' ':show (opt_HiVersion :: Int))
110 endIface Nothing = return ()
111 endIface (Just if_hdl) = hPutStr if_hdl "\n" >> hClose if_hdl
116 ifaceMain Nothing iface_stuff = return ()
117 ifaceMain (Just if_hdl)
118 (import_usages, ExportEnv avails fixities, instance_modules)
120 ifaceInstanceModules if_hdl instance_modules >>
121 ifaceUsages if_hdl import_usages >>
122 ifaceExports if_hdl avails >>
123 ifaceFixities if_hdl fixities >>
126 ifaceDecls Nothing tycons classes inst_info final_ids simplified = return ()
127 ifaceDecls (Just hdl)
131 | null_decls = return ()
132 -- You could have a module with just (re-)exports/instances in it
134 = ifaceInstances hdl inst_infos >>= \ needed_ids ->
135 hPutStr hdl "_declarations_\n" >>
136 ifaceClasses hdl classes >>
137 ifaceTyCons hdl tycons >>
138 ifaceBinds hdl needed_ids final_ids binds >>
141 null_decls = null binds &&
144 isEmptyBag inst_infos
148 ifaceUsages if_hdl import_usages
149 = hPutStr if_hdl "_usages_\n" >>
150 hPutCol if_hdl upp_uses (sortLt lt_imp_vers import_usages)
152 upp_uses (m, hif, mv, whats_imported)
153 = hsep [pprModule m, pp_hif hif, int mv, ptext SLIT("::"),
154 upp_import_versions whats_imported
157 -- Importing the whole module is indicated by an empty list
158 upp_import_versions Everything = empty
160 -- For imported versions we do print the version number
161 upp_import_versions (Specifically nvs)
162 = hsep [ hsep [ppr_unqual_name n, int v] | (n,v) <- sort_versions nvs ]
164 ifaceInstanceModules if_hdl [] = return ()
165 ifaceInstanceModules if_hdl imods
166 = hPutStr if_hdl "_instance_modules_\n" >>
167 printForIface if_hdl (hsep (map ptext (sortLt (<) imods))) >>
170 ifaceExports if_hdl [] = return ()
171 ifaceExports if_hdl avails
172 = hPutStr if_hdl "_exports_\n" >>
173 hPutCol if_hdl do_one_module (fmToList export_fm)
175 -- Sort them into groups by module
176 export_fm :: FiniteMap Module [AvailInfo]
177 export_fm = foldr insert emptyFM avails
179 insert NotAvailable efm = efm
180 insert avail efm = addToFM_C (++) efm mod [avail]
182 mod = nameModule (availName avail)
184 -- Print one module's worth of stuff
185 do_one_module :: (Module, [AvailInfo]) -> SDoc
186 do_one_module (mod_name, avails@(avail1:_))
187 = hsep [pp_hif (ifaceFlavour (availName avail1)),
189 hsep (map upp_avail (sortLt lt_avail avails))
192 -- The "!" indicates that the exported things came from a hi-boot interface
193 pp_hif HiFile = empty
194 pp_hif HiBootFile = char '!'
196 ifaceFixities if_hdl [] = return ()
197 ifaceFixities if_hdl fixities
198 = hPutStr if_hdl "_fixities_\n" >>
199 hPutCol if_hdl upp_fixity fixities
202 %************************************************************************
204 \subsection{Instance declarations}
206 %************************************************************************
210 ifaceInstances :: Handle -> Bag InstInfo -> IO IdSet -- The IdSet is the needed dfuns
211 ifaceInstances if_hdl inst_infos
212 | null togo_insts = return emptyIdSet
213 | otherwise = hPutStr if_hdl "_instances_\n" >>
214 hPutCol if_hdl pp_inst (sortLt lt_inst togo_insts) >>
217 togo_insts = filter is_togo_inst (bagToList inst_infos)
218 needed_ids = mkIdSet [dfun_id | InstInfo _ _ _ _ _ dfun_id _ _ _ <- togo_insts]
219 is_togo_inst (InstInfo _ _ _ _ _ dfun_id _ _ _) = isLocallyDefined dfun_id
222 lt_inst (InstInfo _ _ _ _ _ dfun_id1 _ _ _)
223 (InstInfo _ _ _ _ _ dfun_id2 _ _ _)
224 = getOccName dfun_id1 < getOccName dfun_id2
225 -- The dfuns are assigned names df1, df2, etc, in order of original textual
226 -- occurrence, and this makes as good a sort order as any
229 pp_inst (InstInfo clas tvs tys theta _ dfun_id _ _ _)
231 forall_ty = mkSigmaTy tvs theta (mkDictTy clas tys)
232 renumbered_ty = nmbrGlobalType forall_ty
234 hcat [ptext SLIT("instance "), pprType renumbered_ty,
235 ptext SLIT(" = "), ppr_unqual_name dfun_id, semi]
239 %************************************************************************
241 \subsection{Printing values}
243 %************************************************************************
246 ifaceId :: (Id -> IdInfo) -- This function "knows" the extra info added
247 -- by the STG passes. Sigh
249 -> IdSet -- Set of Ids that are needed by earlier interface
250 -- file emissions. If the Id isn't in this set, and isn't
251 -- exported, there's no need to emit anything
252 -> Bool -- True <=> recursive, so don't print unfolding
254 -> CoreExpr -- The Id's right hand side
255 -> Maybe (SDoc, IdSet) -- The emitted stuff, plus a possibly-augmented set of needed Ids
257 ifaceId get_idinfo needed_ids is_rec id rhs
258 | not (id `elementOfIdSet` needed_ids || -- Needed [no id in needed_ids has omitIfaceSigForId]
259 (isExported id && not (omitIfaceSigForId id))) -- or exported and not to be omitted
260 = Nothing -- Well, that was easy!
262 ifaceId get_idinfo needed_ids is_rec id rhs
263 = Just (hsep [sig_pretty, pp_double_semi, prag_pretty], new_needed_ids)
265 pp_double_semi = ptext SLIT(";;")
266 idinfo = get_idinfo id
267 inline_pragma = inlinePragInfo idinfo
269 ty_pretty = pprType (nmbrGlobalType (idType id))
270 sig_pretty = hcat [ppr (getOccName id), ptext SLIT(" _:_ "), ty_pretty]
273 | opt_OmitInterfacePragmas = empty
274 | otherwise = hsep [arity_pretty, strict_pretty, unfold_pretty,
275 spec_pretty, pp_double_semi]
277 ------------ Arity --------------
278 arity_pretty = ppArityInfo (arityInfo idinfo)
280 ------------ Strictness --------------
281 strict_info = strictnessInfo idinfo
282 has_worker = workerExists strict_info
283 strict_pretty = ppStrictnessInfo strict_info <+> wrkr_pretty
285 wrkr_pretty | not has_worker = empty
286 | null con_list = pprId work_id
287 | otherwise = pprId work_id <+>
288 braces (hsep (map (pprId) con_list))
290 (work_id, wrapper_cons) = getWorkerIdAndCons id rhs
291 con_list = idSetToList wrapper_cons
293 ------------ Unfolding --------------
294 unfold_pretty | show_unfold = hsep [ptext unfold_herald, pprIfaceUnfolding rhs]
297 unfold_herald = case inline_pragma of
298 IMustBeINLINEd -> SLIT("_U_")
299 IWantToBeINLINEd -> SLIT("_U_")
302 show_unfold = not implicit_unfolding && -- Not unnecessary
303 unfolding_is_ok -- Not dangerous
305 implicit_unfolding = has_worker ||
306 bottomIsGuaranteed strict_info
309 = case inline_pragma of
310 IMustBeINLINEd -> definitely_ok_to_unfold
311 IWantToBeINLINEd -> definitely_ok_to_unfold
312 IDontWantToBeINLINEd -> False
313 IMustNotBeINLINEd -> False
314 NoPragmaInfo -> case guidance of
315 UnfoldNever -> False -- Too big
316 other -> definitely_ok_to_unfold
318 definitely_ok_to_unfold = okToUnfoldInHiFile rhs
319 guidance = calcUnfoldingGuidance opt_InterfaceUnfoldThreshold rhs
321 ------------ Specialisations --------------
322 spec_list = specEnvToList (getIdSpecialisation id)
323 spec_pretty = hsep (map pp_spec spec_list)
324 pp_spec (tyvars, tys, rhs) = hsep [ptext SLIT("_P_"),
325 if null tyvars then ptext SLIT("[ ]")
326 else brackets (interppSP tyvars),
327 -- The lexer interprets "[]" as a CONID. Sigh.
328 hsep (map pprParendType tys),
330 pprIfaceUnfolding rhs
333 ------------ Extra free Ids --------------
334 new_needed_ids = (needed_ids `minusIdSet` unitIdSet id) `unionIdSets`
337 extra_ids | opt_OmitInterfacePragmas = emptyIdSet
338 | otherwise = worker_ids `unionIdSets`
339 unfold_ids `unionIdSets`
342 worker_ids | has_worker = unitIdSet work_id
343 | otherwise = emptyIdSet
345 spec_ids = foldr add emptyIdSet spec_list
347 add (_, _, rhs) = unionIdSets (find_fvs rhs)
349 unfold_ids | show_unfold = find_fvs rhs
350 | otherwise = emptyIdSet
352 find_fvs expr = free_vars
354 free_vars = exprFreeVars interesting expr
355 interesting id = isLocallyDefined id &&
356 not (omitIfaceSigForId id)
361 -> IdSet -- These Ids are needed already
362 -> [Id] -- Ids used at code-gen time; they have better pragma info!
363 -> [CoreBinding] -- In dependency order, later depend on earlier
366 ifaceBinds hdl needed_ids final_ids binds
367 = mapIO (printForIface hdl) pretties >>
370 final_id_map = listToUFM [(id,id) | id <- final_ids]
371 get_idinfo id = case lookupUFM final_id_map id of
372 Just id' -> idInfo id'
373 Nothing -> pprTrace "ifaceBinds not found:" (ppr id) $
376 pretties = go needed_ids (reverse binds) -- Reverse so that later things will
377 -- provoke earlier ones to be emitted
378 go needed [] = if not (isEmptyIdSet needed) then
379 pprTrace "ifaceBinds: free vars:"
380 (sep (map ppr (idSetToList needed))) $
385 go needed (NonRec id rhs : binds)
386 = case ifaceId get_idinfo needed False id rhs of
387 Nothing -> go needed binds
388 Just (pretty, needed') -> pretty : go needed' binds
390 -- Recursive groups are a bit more of a pain. We may only need one to
391 -- start with, but it may call out the next one, and so on. So we
392 -- have to look for a fixed point.
393 go needed (Rec pairs : binds)
394 = pretties ++ go needed'' binds
396 (needed', pretties) = go_rec needed pairs
397 needed'' = needed' `minusIdSet` mkIdSet (map fst pairs)
398 -- Later ones may spuriously cause earlier ones to be "needed" again
400 go_rec :: IdSet -> [(Id,CoreExpr)] -> (IdSet, [SDoc])
402 | null pretties = (needed, [])
403 | otherwise = (final_needed, more_pretties ++ pretties)
405 reduced_pairs = [pair | (pair,Nothing) <- pairs `zip` maybes]
406 pretties = catMaybes maybes
407 (needed', maybes) = mapAccumL do_one needed pairs
408 (final_needed, more_pretties) = go_rec needed' reduced_pairs
410 do_one needed (id,rhs) = case ifaceId get_idinfo needed True id rhs of
411 Nothing -> (needed, Nothing)
412 Just (pretty, needed') -> (needed', Just pretty)
416 %************************************************************************
418 \subsection{Random small things}
420 %************************************************************************
423 ifaceTyCons hdl tycons = hPutCol hdl upp_tycon (sortLt (<) (filter (for_iface_name . getName) tycons ))
424 ifaceClasses hdl classes = hPutCol hdl upp_class (sortLt (<) (filter (for_iface_name . getName) classes))
426 for_iface_name name = isLocallyDefined name &&
427 not (isWiredInName name)
429 upp_tycon tycon = ifaceTyCon tycon
430 upp_class clas = ifaceClass clas
435 ifaceTyCon :: TyCon -> SDoc
438 = hsep [ ptext SLIT("type"),
440 pprTyVarBndrs tyvars,
446 (tyvars, ty) = getSynTyConDefn tycon
450 = hsep [ ptext keyword,
451 ppr_decl_context (tyConTheta tycon),
453 pprTyVarBndrs (tyConTyVars tycon),
455 hsep (punctuate (ptext SLIT(" | ")) (map ppr_con (tyConDataCons tycon))),
459 keyword | isNewTyCon tycon = SLIT("newtype")
460 | otherwise = SLIT("data")
465 hsep (map ppr_arg_ty (strict_marks `zip` arg_tys))
470 braces $ hsep $ punctuate comma (map ppr_field (strict_marks `zip` field_labels))
473 field_labels = dataConFieldLabels data_con
474 arg_tys = dataConRawArgTys data_con
475 strict_marks = dataConStrictMarks data_con
476 name = getName data_con
478 ppr_arg_ty (strict_mark, ty) = ppr_strict_mark strict_mark <> pprParendType ty
480 ppr_strict_mark NotMarkedStrict = empty
481 ppr_strict_mark MarkedStrict = ptext SLIT("! ")
482 -- The extra space helps the lexical analyser that lexes
483 -- interface files; it doesn't make the rigid operator/identifier
484 -- distinction, so "!a" is a valid identifier so far as it is concerned
486 ppr_field (strict_mark, field_label)
487 = hsep [ ppr (fieldLabelName field_label),
489 ppr_strict_mark strict_mark <> pprParendType (fieldLabelType field_label)
493 = pprPanic "pprIfaceTyDecl" (ppr tycon)
496 = hsep [ptext SLIT("class"),
497 ppr_decl_context sc_theta,
498 ppr clas, -- Print the name
499 pprTyVarBndrs clas_tyvars,
504 (clas_tyvars, sc_theta, _, sel_ids, defms) = classBigSig clas
506 pp_ops | null sel_ids = empty
507 | otherwise = hsep [ptext SLIT("where"),
508 braces (hsep (punctuate semi (zipWith ppr_classop sel_ids defms)))
511 ppr_classop sel_id maybe_defm
512 = ASSERT( sel_tyvars == clas_tyvars)
513 hsep [ppr (getOccName sel_id),
514 if maybeToBool maybe_defm then equals else empty,
519 (sel_tyvars, _, op_ty) = splitSigmaTy (idType sel_id)
521 ppr_decl_context :: ThetaType -> SDoc
522 ppr_decl_context [] = empty
523 ppr_decl_context theta
524 = braces (hsep (punctuate comma (map (ppr_dict) theta)))
528 ppr_dict (clas,tys) = ppr clas <+> hsep (map pprParendType tys)
531 %************************************************************************
533 \subsection{Random small things}
535 %************************************************************************
537 When printing export lists, we print like this:
539 AvailTC C [C, x, y] C(x,y)
540 AvailTC C [x, y] C!(x,y) -- Exporting x, y but not C
543 upp_avail NotAvailable = empty
544 upp_avail (Avail name) = upp_occname (getOccName name)
545 upp_avail (AvailTC name []) = empty
546 upp_avail (AvailTC name ns) = hcat [upp_occname (getOccName name), bang, upp_export ns']
548 bang | name `elem` ns = empty
549 | otherwise = char '|'
550 ns' = filter (/= name) ns
552 upp_export [] = empty
553 upp_export names = parens (hsep (map (upp_occname . getOccName) names))
555 upp_fixity (occ, fixity) = hcat [ppr fixity, space, upp_occname occ, semi]
557 ppr_unqual_name :: NamedThing a => a -> SDoc -- Just its occurrence name
558 ppr_unqual_name name = upp_occname (getOccName name)
560 upp_occname :: OccName -> SDoc
561 upp_occname occ = ptext (occNameString occ)
565 %************************************************************************
567 \subsection{Comparisons
569 %************************************************************************
572 The various sorts above simply prevent unnecessary "wobbling" when
573 things change that don't have to. We therefore compare lexically, not
577 lt_avail :: AvailInfo -> AvailInfo -> Bool
579 a1 `lt_avail` a2 = availName a1 `lt_name` availName a2
581 lt_name :: Name -> Name -> Bool
582 n1 `lt_name` n2 = modAndOcc n1 < modAndOcc n2
584 lt_lexical :: NamedThing a => a -> a -> Bool
585 lt_lexical a1 a2 = getName a1 `lt_name` getName a2
587 lt_imp_vers :: ImportVersion a -> ImportVersion a -> Bool
588 lt_imp_vers (m1,_,_,_) (m2,_,_,_) = m1 < m2
590 sort_versions vs = sortLt lt_vers vs
592 lt_vers :: LocalVersion Name -> LocalVersion Name -> Bool
593 lt_vers (n1,v1) (n2,v2) = n1 `lt_name` n2
602 hPutCol hdl fmt xs = mapIO (printForIface hdl . fmt) xs
604 mapIO :: (a -> IO b) -> [a] -> IO ()
605 mapIO f [] = return ()
606 mapIO f (x:xs) = f x >> mapIO f xs