2 % (c) The GRASP/AQUA Project, Glasgow University, 1993-1998
4 \section[MkIface]{Print an interface for a module}
8 mkModDetails, mkModDetailsFromIface, completeIface, writeIface
11 #include "HsVersions.h"
14 import HsCore ( HsIdInfo(..), UfExpr(..), toUfExpr, toUfBndr )
15 import HsTypes ( toHsTyVars )
16 import BasicTypes ( Fixity(..), NewOrData(..),
17 Version, initialVersion, bumpVersion, isLoopBreaker
20 import RnHsSyn ( RenamedInstDecl, RenamedTyClDecl )
21 import TcHsSyn ( TypecheckedRuleDecl )
22 import HscTypes ( VersionInfo(..), IfaceDecls(..), ModIface(..), ModDetails(..),
23 TyThing(..), DFunId, TypeEnv, isTyClThing, Avails,
24 WhatsImported(..), GenAvailInfo(..),
25 ImportVersion, AvailInfo, Deprecations(..),
26 Finder, ModuleLocation(..)
30 import Id ( Id, idType, idInfo, omitIfaceSigForId, isUserExportedId, hasNoBinding,
31 idSpecialisation, idName, setIdInfo
35 import DataCon ( StrictnessMark(..), dataConSig, dataConFieldLabels, dataConStrictMarks )
37 import CoreSyn ( CoreExpr, CoreBind, Bind(..), CoreRule(..), IdCoreRule,
38 isBuiltinRule, rulesRules, rulesRhsFreeVars, emptyCoreRules,
41 import CoreFVs ( exprSomeFreeVars, ruleSomeLhsFreeVars, ruleSomeFreeVars )
42 import CoreUnfold ( okToUnfoldInHiFile, mkTopUnfolding, neverUnfold, unfoldingTemplate, noUnfolding )
43 import Name ( isLocallyDefined, getName,
45 plusNameEnv, lookupNameEnv, emptyNameEnv, mkNameEnv,
46 extendNameEnv, lookupNameEnv_NF, nameEnvElts
48 import OccName ( pprOccName )
49 import TyCon ( TyCon, getSynTyConDefn, isSynTyCon, isNewTyCon, isAlgTyCon,
50 tyConTheta, tyConTyVars, tyConDataCons, tyConFamilySize
52 import Class ( classExtraBigSig, DefMeth(..) )
53 import FieldLabel ( fieldLabelType )
54 import Type ( splitSigmaTy, tidyTopType, deNoteType )
55 import SrcLoc ( noSrcLoc )
57 import Module ( ModuleName, moduleName )
59 import List ( partition )
60 import IO ( IOMode(..), openFile, hClose )
64 %************************************************************************
66 \subsection{Write a new interface file}
68 %************************************************************************
71 mkModDetails :: TypeEnv -> [DFunId] -- From typechecker
72 -> [CoreBind] -> [Id] -- Final bindings, plus the top-level Ids from the
73 -- code generator; they have authoritative arity info
74 -> [IdCoreRule] -- Tidy orphan rules
76 mkModDetails type_env dfun_ids tidy_binds stg_ids orphan_rules
77 = ModDetails { md_types = new_type_env,
81 -- The competed type environment is gotten from
82 -- a) keeping the types and classes
83 -- b) removing all Ids, and Ids with correct IdInfo
84 -- gotten from the bindings
85 new_type_env = mkNameEnv [(getName tycl, tycl) | tycl <- orig_type_env, isTyClThing tycl]
87 mkNameEnv [(idName id, AnId id) | id <- final_ids]
89 orig_type_env = nameEnvElts type_env
91 final_ids = bindsToIds (mkVarSet dfun_ids `unionVarSet` orphan_rule_ids)
95 -- The complete rules are gotten by combining
96 -- a) the orphan rules
97 -- b) rules embedded in the top-level Ids
98 rule_dcls | opt_OmitInterfacePragmas = []
99 | otherwise = getRules orphan_rules tidy_binds (mkVarSet final_ids)
101 orphan_rule_ids = unionVarSets [ ruleSomeFreeVars interestingId rule
102 | (_, rule) <- orphan_rules]
105 -- This version is used when we are re-linking a module
106 -- so we've only run the type checker on its previous interface
107 mkModDetailsFromIface :: TypeEnv -> [DFunId] -- From typechecker
108 -> [TypecheckedRuleDecl]
110 mkModDetailsFromIface type_env dfun_ids rules
111 = ModDetails { md_types = type_env,
112 md_rules = rule_dcls,
113 md_insts = dfun_ids }
115 rule_dcls = [(id,rule) | IfaceRuleOut id rule <- rules]
116 -- All the rules from an interface are of the IfaceRuleOut form
119 completeIface :: Maybe ModIface -- The old interface, if we have it
120 -> ModIface -- The new one, minus the decls and versions
121 -> ModDetails -- The ModDetails for this module
122 -> Maybe (ModIface, SDoc) -- The new one, complete with decls and versions
123 -- The SDoc is a debug document giving differences
124 -- Nothing => no change
126 -- NB: 'Nothing' means that even the usages havn't changed, so there's no
127 -- need to write a new interface file. But even if the usages have
128 -- changed, the module version may not have.
130 -- The IO in the type is solely for debug output
131 -- In particular, dumping a record of what has changed
132 completeIface maybe_old_iface new_iface mod_details
133 = addVersionInfo maybe_old_iface (new_iface { mi_decls = new_decls })
135 new_decls = IfaceDecls { dcl_tycl = ty_cls_dcls,
136 dcl_insts = inst_dcls,
137 dcl_rules = rule_dcls }
139 inst_dcls = map ifaceInstance (md_insts mod_details)
140 ty_cls_dcls = map ifaceTyCls (nameEnvElts (md_types mod_details))
141 rule_dcls = map ifaceRule (md_rules mod_details)
145 %************************************************************************
147 \subsection{Types and classes}
149 %************************************************************************
152 ifaceTyCls :: TyThing -> RenamedTyClDecl
153 ifaceTyCls (AClass clas)
154 = ClassDecl (toHsContext sc_theta)
156 (toHsTyVars clas_tyvars)
158 (map toClassOpSig op_stuff)
162 (clas_tyvars, clas_fds, sc_theta, _, op_stuff) = classExtraBigSig clas
164 toClassOpSig (sel_id, def_meth)
165 = ASSERT(sel_tyvars == clas_tyvars)
166 ClassOpSig (getName sel_id) (Just def_meth') (toHsType op_ty) noSrcLoc
168 (sel_tyvars, _, op_ty) = splitSigmaTy (idType sel_id)
169 def_meth' = case def_meth of
170 NoDefMeth -> NoDefMeth
171 GenDefMeth -> GenDefMeth
172 DefMeth id -> DefMeth (getName id)
174 ifaceTyCls (ATyCon tycon)
176 = TySynonym (getName tycon)(toHsTyVars tyvars) (toHsType ty) noSrcLoc
178 (tyvars, ty) = getSynTyConDefn tycon
180 ifaceTyCls (ATyCon tycon)
182 = TyData new_or_data (toHsContext (tyConTheta tycon))
185 (map ifaceConDecl (tyConDataCons tycon))
186 (tyConFamilySize tycon)
187 Nothing noSrcLoc (panic "gen1") (panic "gen2")
189 tyvars = tyConTyVars tycon
190 new_or_data | isNewTyCon tycon = NewType
191 | otherwise = DataType
193 ifaceConDecl data_con
194 = ConDecl (getName data_con) (error "ifaceConDecl")
195 (toHsTyVars ex_tyvars)
196 (toHsContext ex_theta)
199 (tyvars1, _, ex_tyvars, ex_theta, arg_tys, tycon1) = dataConSig data_con
200 field_labels = dataConFieldLabels data_con
201 strict_marks = dataConStrictMarks data_con
202 details | null field_labels
203 = ASSERT( tycon == tycon1 && tyvars == tyvars1 )
204 VanillaCon (zipWith mk_bang_ty strict_marks arg_tys)
207 = RecCon (zipWith mk_field strict_marks field_labels)
209 mk_bang_ty NotMarkedStrict ty = Unbanged (toHsType ty)
210 mk_bang_ty (MarkedUnboxed _ _) ty = Unpacked (toHsType ty)
211 mk_bang_ty MarkedStrict ty = Banged (toHsType ty)
213 mk_field strict_mark field_label
214 = ([getName field_label], mk_bang_ty strict_mark (fieldLabelType field_label))
216 ifaceTyCls (ATyCon tycon) = pprPanic "ifaceTyCls" (ppr tycon)
219 = IfaceSig (getName id) (toHsType id_type) hs_idinfo noSrcLoc
224 hs_idinfo | opt_OmitInterfacePragmas = []
225 | otherwise = arity_hsinfo ++ caf_hsinfo ++ cpr_hsinfo ++
226 strict_hsinfo ++ wrkr_hsinfo ++ unfold_hsinfo
228 ------------ Arity --------------
229 arity_hsinfo = case arityInfo id_info of
230 a@(ArityExactly n) -> [HsArity a]
233 ------------ Caf Info --------------
234 caf_hsinfo = case cafInfo id_info of
235 NoCafRefs -> [HsNoCafRefs]
238 ------------ CPR Info --------------
239 cpr_hsinfo = case cprInfo id_info of
240 ReturnsCPR -> [HsCprInfo]
243 ------------ Strictness --------------
244 strict_hsinfo = case strictnessInfo id_info of
245 NoStrictnessInfo -> []
246 info -> [HsStrictness info]
249 ------------ Worker --------------
250 wrkr_hsinfo = case workerInfo id_info of
251 HasWorker work_id wrap_arity -> [HsWorker (getName work_id)]
254 ------------ Unfolding --------------
255 unfold_info = unfoldingInfo id_info
256 inline_prag = inlinePragInfo id_info
257 rhs = unfoldingTemplate unfold_info
258 unfold_hsinfo | neverUnfold unfold_info = []
259 | otherwise = [HsUnfold inline_prag (toUfExpr rhs)]
263 %************************************************************************
265 \subsection{Instances and rules}
267 %************************************************************************
270 ifaceInstance :: DFunId -> RenamedInstDecl
271 ifaceInstance dfun_id
272 = InstDecl (toHsType tidy_ty) EmptyMonoBinds [] (Just (getName dfun_id)) noSrcLoc
274 tidy_ty = tidyTopType (deNoteType (idType dfun_id))
275 -- The deNoteType is very important. It removes all type
276 -- synonyms from the instance type in interface files.
277 -- That in turn makes sure that when reading in instance decls
278 -- from interface files that the 'gating' mechanism works properly.
279 -- Otherwise you could have
280 -- type Tibble = T Int
281 -- instance Foo Tibble where ...
282 -- and this instance decl wouldn't get imported into a module
283 -- that mentioned T but not Tibble.
285 ifaceRule (id, BuiltinRule _)
286 = pprTrace "toHsRule: builtin" (ppr id) (bogusIfaceRule id)
288 ifaceRule (id, Rule name bndrs args rhs)
289 = IfaceRule name (map toUfBndr bndrs) (getName id)
290 (map toUfExpr args) (toUfExpr rhs) noSrcLoc
293 = IfaceRule SLIT("bogus") [] (getName id) [] (UfVar (getName id)) noSrcLoc
297 %************************************************************************
299 \subsection{Compute final Ids}
301 %************************************************************************
303 A "final Id" has exactly the IdInfo for going into an interface file, or
304 exporting to another module.
307 bindsToIds :: IdSet -- These Ids are needed already
308 -> IdSet -- Ids used at code-gen time; they have better pragma info!
309 -> [CoreBind] -- In dependency order, later depend on earlier
310 -> [Id] -- Set of Ids actually spat out, complete with exactly the IdInfo
311 -- they need for exporting to another module
313 bindsToIds needed_ids codegen_ids binds
314 = go needed_ids (reverse binds) []
315 -- Reverse so that later things will
316 -- provoke earlier ones to be emitted
318 -- The 'needed' set contains the Ids that are needed by earlier
319 -- interface file emissions. If the Id isn't in this set, and isn't
320 -- exported, there's no need to emit anything
321 need_id needed_set id = id `elemVarSet` needed_set || isUserExportedId id
324 | not (isEmptyVarSet needed) = pprTrace "ifaceBinds: free vars:"
325 (sep (map ppr (varSetElems needed)))
327 | otherwise = emitted
329 go needed (NonRec id rhs : binds) emitted
331 = if omitIfaceSigForId id then
332 go (needed `delVarSet` id) binds (id:emitted)
334 go ((needed `unionVarSet` extras) `delVarSet` id)
338 = go needed binds emitted
340 (new_id, extras) = mkFinalId codegen_ids False id rhs
342 -- Recursive groups are a bit more of a pain. We may only need one to
343 -- start with, but it may call out the next one, and so on. So we
344 -- have to look for a fixed point. We don't want necessarily them all,
345 -- because without -O we may only need the first one (if we don't emit
347 go needed (Rec pairs : binds) emitted
348 = go needed' binds emitted'
350 (new_emitted, extras) = go_rec needed pairs
351 needed' = (needed `unionVarSet` extras) `minusVarSet` mkVarSet (map fst pairs)
352 emitted' = new_emitted ++ emitted
354 go_rec :: IdSet -> [(Id,CoreExpr)] -> ([Id], IdSet)
356 | null needed_prs = ([], emptyVarSet)
357 | otherwise = (emitted ++ more_emitted,
358 extras `unionVarSet` more_extras)
360 (needed_prs,leftover_prs) = partition is_needed pairs
361 (emitted, extras_s) = unzip [ mkFinalId codegen_ids True id rhs
362 | (id,rhs) <- needed_prs, not (omitIfaceSigForId id)]
363 extras = unionVarSets extras_s
364 (more_emitted, more_extras) = go_rec extras leftover_prs
366 is_needed (id,_) = need_id needed id
372 mkFinalId :: IdSet -- The Ids with arity info from the code generator
373 -> Bool -- True <=> recursive, so don't include unfolding
375 -> CoreExpr -- The Id's right hand side
376 -> (Id, IdSet) -- The emitted id, plus any *extra* needed Ids
378 mkFinalId codegen_ids is_rec id rhs
379 = (id `setIdInfo` new_idinfo, new_needed_ids)
381 core_idinfo = idInfo id
382 stg_idinfo = case lookupVarSet codegen_ids id of
383 Just id' -> idInfo id'
384 Nothing -> pprTrace "ifaceBinds not found:" (ppr id) $
387 new_idinfo | opt_OmitInterfacePragmas
390 = core_idinfo `setArityInfo` arity_info
391 `setCafInfo` cafInfo stg_idinfo
392 `setUnfoldingInfo` unfold_info
393 `setWorkerInfo` worker_info
394 `setSpecInfo` emptyCoreRules
395 -- We zap the specialisations because they are
396 -- passed on separately through the modules IdCoreRules
398 ------------ Arity --------------
399 arity_info = arityInfo stg_idinfo
400 stg_arity = arityLowerBound arity_info
402 ------------ Worker --------------
403 -- We only treat a function as having a worker if
404 -- the exported arity (which is now the number of visible lambdas)
405 -- is the same as the arity at the moment of the w/w split
406 -- If so, we can safely omit the unfolding inside the wrapper, and
407 -- instead re-generate it from the type/arity/strictness info
408 -- But if the arity has changed, we just take the simple path and
409 -- put the unfolding into the interface file, forgetting the fact
410 -- that it's a wrapper.
412 -- How can this happen? Sometimes we get
413 -- f = coerce t (\x y -> $wf x y)
414 -- at the moment of w/w split; but the eta reducer turns it into
416 -- which is perfectly fine except that the exposed arity so far as
417 -- the code generator is concerned (zero) differs from the arity
418 -- when we did the split (2).
420 -- All this arises because we use 'arity' to mean "exactly how many
421 -- top level lambdas are there" in interface files; but during the
422 -- compilation of this module it means "how many things can I apply
424 worker_info = case workerInfo core_idinfo of
425 info@(HasWorker work_id wrap_arity)
426 | wrap_arity == stg_arity -> info
427 | otherwise -> pprTrace "ifaceId: arity change:" (ppr id)
431 has_worker = case worker_info of
432 HasWorker _ _ -> True
435 HasWorker work_id _ = worker_info
437 ------------ Unfolding --------------
438 inline_pragma = inlinePragInfo core_idinfo
439 dont_inline = isNeverInlinePrag inline_pragma
440 loop_breaker = isLoopBreaker (occInfo core_idinfo)
441 bottoming_fn = isBottomingStrictness (strictnessInfo core_idinfo)
443 unfolding = mkTopUnfolding rhs
444 rhs_is_small = neverUnfold unfolding
446 unfold_info | show_unfold = unfolding
447 | otherwise = noUnfolding
449 show_unfold = not has_worker && -- Not unnecessary
450 not bottoming_fn && -- Not necessary
453 rhs_is_small && -- Small enough
454 okToUnfoldInHiFile rhs -- No casms etc
457 ------------ Extra free Ids --------------
458 new_needed_ids | opt_OmitInterfacePragmas = emptyVarSet
459 | otherwise = worker_ids `unionVarSet`
460 unfold_ids `unionVarSet`
463 spec_ids = filterVarSet interestingId (rulesRhsFreeVars (specInfo core_idinfo))
465 worker_ids | has_worker && interestingId work_id = unitVarSet work_id
466 -- Conceivably, the worker might come from
468 | otherwise = emptyVarSet
470 unfold_ids | show_unfold = find_fvs rhs
471 | otherwise = emptyVarSet
473 find_fvs expr = exprSomeFreeVars interestingId expr
475 interestingId id = isId id && isLocallyDefined id && not (hasNoBinding id)
480 getRules :: [IdCoreRule] -- Orphan rules
481 -> [CoreBind] -- Bindings, with rules in the top-level Ids
482 -> IdSet -- Ids that are exported, so we need their rules
484 getRules orphan_rules binds emitted
485 = orphan_rules ++ local_rules
487 local_rules = [ (fn, rule)
488 | fn <- bindersOfBinds binds,
489 fn `elemVarSet` emitted,
490 rule <- rulesRules (idSpecialisation fn),
491 not (isBuiltinRule rule),
492 -- We can't print builtin rules in interface files
493 -- Since they are built in, an importing module
494 -- will have access to them anyway
496 -- Sept 00: I've disabled this test. It doesn't stop many, if any, rules
497 -- from coming out, and to make it work properly we need to add ????
498 -- (put it back in for now)
499 all (`elemVarSet` emitted) (varSetElems (ruleSomeLhsFreeVars interestingId rule))
500 -- Spit out a rule only if all its lhs free vars are emitted
501 -- This is a good reason not to do it when we emit the Id itself
506 %************************************************************************
508 \subsection{Checking if the new interface is up to date
510 %************************************************************************
513 addVersionInfo :: Maybe ModIface -- The old interface, read from M.hi
514 -> ModIface -- The new interface decls
515 -> Maybe (ModIface, SDoc) -- Nothing => no change; no need to write new Iface
516 -- Just mi => Here is the new interface to write
517 -- with correct version numbers
519 -- NB: the fixities, declarations, rules are all assumed
520 -- to be sorted by increasing order of hsDeclName, so that
521 -- we can compare for equality
523 addVersionInfo Nothing new_iface
524 -- No old interface, so definitely write a new one!
525 = Just (new_iface, text "No old interface available")
527 addVersionInfo (Just old_iface@(ModIface { mi_version = old_version,
528 mi_decls = old_decls,
529 mi_fixities = old_fixities }))
530 new_iface@(ModIface { mi_decls = new_decls,
531 mi_fixities = new_fixities })
533 | no_output_change && no_usage_change
536 | otherwise -- Add updated version numbers
537 = Just (final_iface, pp_tc_diffs)
540 final_iface = new_iface { mi_version = new_version }
541 new_version = VersionInfo { vers_module = bumpVersion no_output_change (vers_module old_version),
542 vers_exports = bumpVersion no_export_change (vers_exports old_version),
543 vers_rules = bumpVersion no_rule_change (vers_rules old_version),
544 vers_decls = tc_vers }
546 no_output_change = no_tc_change && no_rule_change && no_export_change
547 no_usage_change = mi_usages old_iface == mi_usages new_iface
549 no_export_change = mi_exports old_iface == mi_exports new_iface -- Kept sorted
550 no_rule_change = dcl_rules old_decls == dcl_rules new_decls -- Ditto
552 -- Fill in the version number on the new declarations by looking at the old declarations.
553 -- Set the flag if anything changes.
554 -- Assumes that the decls are sorted by hsDeclName.
555 old_vers_decls = vers_decls old_version
556 (no_tc_change, pp_tc_diffs, tc_vers) = diffDecls old_vers_decls old_fixities new_fixities
557 (dcl_tycl old_decls) (dcl_tycl new_decls)
561 diffDecls :: NameEnv Version -- Old version map
562 -> NameEnv Fixity -> NameEnv Fixity -- Old and new fixities
563 -> [RenamedTyClDecl] -> [RenamedTyClDecl] -- Old and new decls
564 -> (Bool, -- True <=> no change
565 SDoc, -- Record of differences
566 NameEnv Version) -- New version
568 diffDecls old_vers old_fixities new_fixities old new
569 = diff True empty emptyNameEnv old new
571 -- When seeing if two decls are the same,
572 -- remember to check whether any relevant fixity has changed
573 eq_tc d1 d2 = d1 == d2 && all (same_fixity . fst) (tyClDeclNames d1)
574 same_fixity n = lookupNameEnv old_fixities n == lookupNameEnv new_fixities n
576 diff ok_so_far pp new_vers [] [] = (ok_so_far, pp, new_vers)
577 diff ok_so_far pp new_vers old [] = (False, pp, new_vers)
578 diff ok_so_far pp new_vers [] (nd:nds) = diff False (pp $$ only_new nd) new_vers [] nds
579 diff ok_so_far pp new_vers (od:ods) (nd:nds)
580 = case od_name `compare` nd_name of
581 LT -> diff False (pp $$ only_old od) new_vers ods (nd:nds)
582 GT -> diff False (pp $$ only_new nd) new_vers (od:ods) nds
583 EQ | od `eq_tc` nd -> diff ok_so_far pp new_vers ods nds
584 | otherwise -> diff False (pp $$ changed od nd) new_vers' ods nds
586 od_name = tyClDeclName od
587 nd_name = tyClDeclName nd
588 new_vers' = extendNameEnv new_vers nd_name
589 (bumpVersion True (lookupNameEnv_NF old_vers od_name))
591 only_old d = ptext SLIT("Only in old iface:") <+> ppr d
592 only_new d = ptext SLIT("Only in new iface:") <+> ppr d
593 changed d nd = ptext SLIT("Changed in iface: ") <+> ((ptext SLIT("Old:") <+> ppr d) $$
594 (ptext SLIT("New:") <+> ppr nd))
599 %************************************************************************
601 \subsection{Writing an interface file}
603 %************************************************************************
606 writeIface :: Finder -> Maybe ModIface -> IO ()
607 writeIface finder Nothing
610 writeIface finder (Just mod_iface)
611 = do { maybe_found <- finder mod_name ;
612 ; case maybe_found of {
613 Nothing -> printErrs (text "Can't write interface file for" <+> ppr mod_name) ;
616 do { let filename = hi_file locn
617 ; if_hdl <- openFile filename WriteMode
618 ; printForIface if_hdl (pprIface mod_iface)
622 mod_name = moduleName (mi_module mod_iface)
625 = vcat [ ptext SLIT("__interface")
626 <+> doubleQuotes (ptext opt_InPackage)
627 <+> ppr (mi_module iface) <+> ppr (vers_module version_info)
629 <+> (if mi_orphan iface then char '!' else empty)
630 <+> int opt_HiVersion
631 <+> ptext SLIT("where")
633 , vcat (map pprExport (mi_exports iface))
634 , vcat (map pprUsage (mi_usages iface))
636 , pprIfaceDecls (vers_decls version_info)
640 , pprDeprecs (mi_deprecs iface)
643 version_info = mi_version iface
644 exp_vers = vers_exports version_info
645 rule_vers = vers_rules version_info
647 pp_sub_vers | exp_vers == initialVersion && rule_vers == initialVersion = empty
648 | otherwise = brackets (ppr exp_vers <+> ppr rule_vers)
651 When printing export lists, we print like this:
653 AvailTC C [C, x, y] C(x,y)
654 AvailTC C [x, y] C!(x,y) -- Exporting x, y but not C
657 pprExport :: (ModuleName, Avails) -> SDoc
658 pprExport (mod, items)
659 = hsep [ ptext SLIT("__export "), ppr mod, hsep (map pp_avail items) ] <> semi
661 ppr_name :: Name -> SDoc -- Print the occurrence name only
662 ppr_name n = ppr (nameOccName n)
664 pp_avail :: AvailInfo -> SDoc
665 pp_avail (Avail name) = ppr_name name
666 pp_avail (AvailTC name []) = empty
667 pp_avail (AvailTC name ns) = hcat [ppr_name name, bang, pp_export ns']
669 bang | name `elem` ns = empty
670 | otherwise = char '|'
671 ns' = filter (/= name) ns
674 pp_export names = braces (hsep (map ppr_name names))
679 pprUsage :: ImportVersion Name -> SDoc
680 pprUsage (m, has_orphans, is_boot, whats_imported)
681 = hsep [ptext SLIT("import"), ppr m,
683 pp_versions whats_imported
686 pp_orphan | has_orphans = char '!'
688 pp_boot | is_boot = char '@'
691 -- Importing the whole module is indicated by an empty list
692 pp_versions NothingAtAll = empty
693 pp_versions (Everything v) = dcolon <+> int v
694 pp_versions (Specifically vm ve nvs vr) = dcolon <+> int vm <+> pp_export_version ve <+> int vr
695 <+> hsep [ ppr n <+> int v | (n,v) <- nvs ]
697 -- HACK for the moment: print the export-list version even if
698 -- we don't use it, so that syntax of interface files doesn't change
699 pp_export_version Nothing = int 1
700 pp_export_version (Just v) = int v
704 pprIfaceDecls version_map fixity_map decls
705 = vcat [ vcat [ppr i <+> semi | i <- dcl_insts decls]
706 , vcat (map ppr_decl (dcl_tycl decls))
707 , pprRules (dcl_rules decls)
710 ppr_decl d = (ppr_vers d <+> ppr d <> semi) $$ ppr_fixes d
712 -- Print the version for the decl
713 ppr_vers d = case lookupNameEnv version_map (tyClDeclName d) of
717 -- Print fixities relevant to the decl
718 ppr_fixes d = vcat [ ppr fix <+> ppr n <> semi
719 | (n,_) <- tyClDeclNames d,
720 Just fix <- [lookupNameEnv fixity_map n]
726 pprRules rules = hsep [ptext SLIT("{-## __R"), vcat (map ppr rules), ptext SLIT("##-}")]
728 pprDeprecs NoDeprecs = empty
729 pprDeprecs deprecs = ptext SLIT("{-## __D") <+> guts <+> ptext SLIT("##-}")
731 guts = case deprecs of
732 DeprecAll txt -> ptext txt
733 DeprecSome env -> pp_deprecs env
735 pp_deprecs env = vcat (punctuate semi (map pp_deprec (nameEnvElts env)))
737 pp_deprec (name, txt) = pprOccName (nameOccName name) <+> ptext txt