2 % (c) The GRASP/AQUA Project, Glasgow University, 1993-1998
4 \section[MkIface]{Print an interface for a module}
8 mkModDetails, mkModDetailsFromIface, completeIface,
12 #include "HsVersions.h"
15 import HsCore ( HsIdInfo(..), UfExpr(..), toUfExpr, toUfBndr )
16 import HsTypes ( toHsTyVars )
17 import BasicTypes ( Fixity(..), NewOrData(..),
18 Version, initialVersion, bumpVersion, isLoopBreaker
21 import RnHsSyn ( RenamedInstDecl, RenamedTyClDecl )
22 import TcHsSyn ( TypecheckedRuleDecl )
23 import HscTypes ( VersionInfo(..), IfaceDecls(..), ModIface(..), ModDetails(..),
24 TyThing(..), DFunId, TypeEnv, isTyClThing, Avails,
25 WhatsImported(..), GenAvailInfo(..),
26 ImportVersion, AvailInfo, Deprecations(..),
27 Finder, ModuleLocation(..)
31 import Id ( Id, idType, idInfo, omitIfaceSigForId, isUserExportedId, hasNoBinding,
32 idSpecialisation, idName, setIdInfo
36 import DataCon ( StrictnessMark(..), dataConSig, dataConFieldLabels, dataConStrictMarks )
38 import CoreSyn ( CoreExpr, CoreBind, Bind(..), CoreRule(..), IdCoreRule,
39 isBuiltinRule, rulesRules, rulesRhsFreeVars, emptyCoreRules,
42 import CoreFVs ( exprSomeFreeVars, ruleSomeLhsFreeVars, ruleSomeFreeVars )
43 import CoreUnfold ( okToUnfoldInHiFile, mkTopUnfolding, neverUnfold, unfoldingTemplate, noUnfolding )
44 import Name ( isLocallyDefined, getName,
46 plusNameEnv, lookupNameEnv, emptyNameEnv, mkNameEnv,
47 extendNameEnv, lookupNameEnv_NF, nameEnvElts
49 import OccName ( pprOccName )
50 import TyCon ( TyCon, getSynTyConDefn, isSynTyCon, isNewTyCon, isAlgTyCon,
51 tyConTheta, tyConTyVars, tyConDataCons, tyConFamilySize
53 import Class ( classExtraBigSig, DefMeth(..) )
54 import FieldLabel ( fieldLabelType )
55 import Type ( splitSigmaTy, tidyTopType, deNoteType )
56 import SrcLoc ( noSrcLoc )
58 import Module ( ModuleName, moduleName )
60 import List ( partition )
61 import IO ( IOMode(..), openFile, hClose )
65 %************************************************************************
67 \subsection{Write a new interface file}
69 %************************************************************************
72 mkModDetails :: TypeEnv -> [DFunId] -- From typechecker
73 -> [CoreBind] -> [Id] -- Final bindings, plus the top-level Ids from the
74 -- code generator; they have authoritative arity info
75 -> [IdCoreRule] -- Tidy orphan rules
77 mkModDetails type_env dfun_ids tidy_binds stg_ids orphan_rules
78 = ModDetails { md_types = new_type_env,
82 -- The competed type environment is gotten from
83 -- a) keeping the types and classes
84 -- b) removing all Ids, and Ids with correct IdInfo
85 -- gotten from the bindings
86 new_type_env = mkNameEnv [(getName tycl, tycl) | tycl <- orig_type_env, isTyClThing tycl]
88 mkNameEnv [(idName id, AnId id) | id <- final_ids]
90 orig_type_env = nameEnvElts type_env
92 final_ids = bindsToIds (mkVarSet dfun_ids `unionVarSet` orphan_rule_ids)
96 -- The complete rules are gotten by combining
97 -- a) the orphan rules
98 -- b) rules embedded in the top-level Ids
99 rule_dcls | opt_OmitInterfacePragmas = []
100 | otherwise = getRules orphan_rules tidy_binds (mkVarSet final_ids)
102 orphan_rule_ids = unionVarSets [ ruleSomeFreeVars interestingId rule
103 | (_, rule) <- orphan_rules]
106 -- This version is used when we are re-linking a module
107 -- so we've only run the type checker on its previous interface
108 mkModDetailsFromIface :: TypeEnv -> [DFunId] -- From typechecker
109 -> [TypecheckedRuleDecl]
111 mkModDetailsFromIface type_env dfun_ids rules
112 = ModDetails { md_types = type_env,
113 md_rules = rule_dcls,
114 md_insts = dfun_ids }
116 rule_dcls = [(id,rule) | IfaceRuleOut id rule <- rules]
117 -- All the rules from an interface are of the IfaceRuleOut form
120 completeIface :: Maybe ModIface -- The old interface, if we have it
121 -> ModIface -- The new one, minus the decls and versions
122 -> ModDetails -- The ModDetails for this module
123 -> Maybe (ModIface, SDoc) -- The new one, complete with decls and versions
124 -- The SDoc is a debug document giving differences
125 -- Nothing => no change
127 -- NB: 'Nothing' means that even the usages havn't changed, so there's no
128 -- need to write a new interface file. But even if the usages have
129 -- changed, the module version may not have.
131 -- The IO in the type is solely for debug output
132 -- In particular, dumping a record of what has changed
133 completeIface maybe_old_iface new_iface mod_details
134 = addVersionInfo maybe_old_iface (new_iface { mi_decls = new_decls })
136 new_decls = IfaceDecls { dcl_tycl = ty_cls_dcls,
137 dcl_insts = inst_dcls,
138 dcl_rules = rule_dcls }
140 inst_dcls = map ifaceInstance (md_insts mod_details)
141 ty_cls_dcls = map ifaceTyCls (nameEnvElts (md_types mod_details))
142 rule_dcls = map ifaceRule (md_rules mod_details)
146 %************************************************************************
148 \subsection{Types and classes}
150 %************************************************************************
153 ifaceTyCls :: TyThing -> RenamedTyClDecl
154 ifaceTyCls (AClass clas)
155 = ClassDecl (toHsContext sc_theta)
157 (toHsTyVars clas_tyvars)
159 (map toClassOpSig op_stuff)
163 (clas_tyvars, clas_fds, sc_theta, _, op_stuff) = classExtraBigSig clas
165 toClassOpSig (sel_id, def_meth)
166 = ASSERT(sel_tyvars == clas_tyvars)
167 ClassOpSig (getName sel_id) (Just def_meth') (toHsType op_ty) noSrcLoc
169 (sel_tyvars, _, op_ty) = splitSigmaTy (idType sel_id)
170 def_meth' = case def_meth of
171 NoDefMeth -> NoDefMeth
172 GenDefMeth -> GenDefMeth
173 DefMeth id -> DefMeth (getName id)
175 ifaceTyCls (ATyCon tycon)
177 = TySynonym (getName tycon)(toHsTyVars tyvars) (toHsType ty) noSrcLoc
179 (tyvars, ty) = getSynTyConDefn tycon
181 ifaceTyCls (ATyCon tycon)
183 = TyData new_or_data (toHsContext (tyConTheta tycon))
186 (map ifaceConDecl (tyConDataCons tycon))
187 (tyConFamilySize tycon)
188 Nothing noSrcLoc (panic "gen1") (panic "gen2")
190 tyvars = tyConTyVars tycon
191 new_or_data | isNewTyCon tycon = NewType
192 | otherwise = DataType
194 ifaceConDecl data_con
195 = ConDecl (getName data_con) (error "ifaceConDecl")
196 (toHsTyVars ex_tyvars)
197 (toHsContext ex_theta)
200 (tyvars1, _, ex_tyvars, ex_theta, arg_tys, tycon1) = dataConSig data_con
201 field_labels = dataConFieldLabels data_con
202 strict_marks = dataConStrictMarks data_con
203 details | null field_labels
204 = ASSERT( tycon == tycon1 && tyvars == tyvars1 )
205 VanillaCon (zipWith mk_bang_ty strict_marks arg_tys)
208 = RecCon (zipWith mk_field strict_marks field_labels)
210 mk_bang_ty NotMarkedStrict ty = Unbanged (toHsType ty)
211 mk_bang_ty (MarkedUnboxed _ _) ty = Unpacked (toHsType ty)
212 mk_bang_ty MarkedStrict ty = Banged (toHsType ty)
214 mk_field strict_mark field_label
215 = ([getName field_label], mk_bang_ty strict_mark (fieldLabelType field_label))
217 ifaceTyCls (ATyCon tycon) = pprPanic "ifaceTyCls" (ppr tycon)
220 = IfaceSig (getName id) (toHsType id_type) hs_idinfo noSrcLoc
225 hs_idinfo | opt_OmitInterfacePragmas = []
226 | otherwise = arity_hsinfo ++ caf_hsinfo ++ cpr_hsinfo ++
227 strict_hsinfo ++ wrkr_hsinfo ++ unfold_hsinfo
229 ------------ Arity --------------
230 arity_hsinfo = case arityInfo id_info of
231 a@(ArityExactly n) -> [HsArity a]
234 ------------ Caf Info --------------
235 caf_hsinfo = case cafInfo id_info of
236 NoCafRefs -> [HsNoCafRefs]
239 ------------ CPR Info --------------
240 cpr_hsinfo = case cprInfo id_info of
241 ReturnsCPR -> [HsCprInfo]
244 ------------ Strictness --------------
245 strict_hsinfo = case strictnessInfo id_info of
246 NoStrictnessInfo -> []
247 info -> [HsStrictness info]
250 ------------ Worker --------------
251 wrkr_hsinfo = case workerInfo id_info of
252 HasWorker work_id wrap_arity -> [HsWorker (getName work_id)]
255 ------------ Unfolding --------------
256 unfold_info = unfoldingInfo id_info
257 inline_prag = inlinePragInfo id_info
258 rhs = unfoldingTemplate unfold_info
259 unfold_hsinfo | neverUnfold unfold_info = []
260 | otherwise = [HsUnfold inline_prag (toUfExpr rhs)]
264 %************************************************************************
266 \subsection{Instances and rules}
268 %************************************************************************
271 ifaceInstance :: DFunId -> RenamedInstDecl
272 ifaceInstance dfun_id
273 = InstDecl (toHsType tidy_ty) EmptyMonoBinds [] (Just (getName dfun_id)) noSrcLoc
275 tidy_ty = tidyTopType (deNoteType (idType dfun_id))
276 -- The deNoteType is very important. It removes all type
277 -- synonyms from the instance type in interface files.
278 -- That in turn makes sure that when reading in instance decls
279 -- from interface files that the 'gating' mechanism works properly.
280 -- Otherwise you could have
281 -- type Tibble = T Int
282 -- instance Foo Tibble where ...
283 -- and this instance decl wouldn't get imported into a module
284 -- that mentioned T but not Tibble.
286 ifaceRule (id, BuiltinRule _)
287 = pprTrace "toHsRule: builtin" (ppr id) (bogusIfaceRule id)
289 ifaceRule (id, Rule name bndrs args rhs)
290 = IfaceRule name (map toUfBndr bndrs) (getName id)
291 (map toUfExpr args) (toUfExpr rhs) noSrcLoc
294 = IfaceRule SLIT("bogus") [] (getName id) [] (UfVar (getName id)) noSrcLoc
298 %************************************************************************
300 \subsection{Compute final Ids}
302 %************************************************************************
304 A "final Id" has exactly the IdInfo for going into an interface file, or
305 exporting to another module.
308 bindsToIds :: IdSet -- These Ids are needed already
309 -> IdSet -- Ids used at code-gen time; they have better pragma info!
310 -> [CoreBind] -- In dependency order, later depend on earlier
311 -> [Id] -- Set of Ids actually spat out, complete with exactly the IdInfo
312 -- they need for exporting to another module
314 bindsToIds needed_ids codegen_ids binds
315 = go needed_ids (reverse binds) []
316 -- Reverse so that later things will
317 -- provoke earlier ones to be emitted
319 -- The 'needed' set contains the Ids that are needed by earlier
320 -- interface file emissions. If the Id isn't in this set, and isn't
321 -- exported, there's no need to emit anything
322 need_id needed_set id = id `elemVarSet` needed_set || isUserExportedId id
325 | not (isEmptyVarSet needed) = pprTrace "ifaceBinds: free vars:"
326 (sep (map ppr (varSetElems needed)))
328 | otherwise = emitted
330 go needed (NonRec id rhs : binds) emitted
332 = if omitIfaceSigForId id then
333 go (needed `delVarSet` id) binds (id:emitted)
335 go ((needed `unionVarSet` extras) `delVarSet` id)
339 = go needed binds emitted
341 (new_id, extras) = mkFinalId codegen_ids False id rhs
343 -- Recursive groups are a bit more of a pain. We may only need one to
344 -- start with, but it may call out the next one, and so on. So we
345 -- have to look for a fixed point. We don't want necessarily them all,
346 -- because without -O we may only need the first one (if we don't emit
348 go needed (Rec pairs : binds) emitted
349 = go needed' binds emitted'
351 (new_emitted, extras) = go_rec needed pairs
352 needed' = (needed `unionVarSet` extras) `minusVarSet` mkVarSet (map fst pairs)
353 emitted' = new_emitted ++ emitted
355 go_rec :: IdSet -> [(Id,CoreExpr)] -> ([Id], IdSet)
357 | null needed_prs = ([], emptyVarSet)
358 | otherwise = (emitted ++ more_emitted,
359 extras `unionVarSet` more_extras)
361 (needed_prs,leftover_prs) = partition is_needed pairs
362 (emitted, extras_s) = unzip [ mkFinalId codegen_ids True id rhs
363 | (id,rhs) <- needed_prs, not (omitIfaceSigForId id)]
364 extras = unionVarSets extras_s
365 (more_emitted, more_extras) = go_rec extras leftover_prs
367 is_needed (id,_) = need_id needed id
373 mkFinalId :: IdSet -- The Ids with arity info from the code generator
374 -> Bool -- True <=> recursive, so don't include unfolding
376 -> CoreExpr -- The Id's right hand side
377 -> (Id, IdSet) -- The emitted id, plus any *extra* needed Ids
379 mkFinalId codegen_ids is_rec id rhs
380 = (id `setIdInfo` new_idinfo, new_needed_ids)
382 core_idinfo = idInfo id
383 stg_idinfo = case lookupVarSet codegen_ids id of
384 Just id' -> idInfo id'
385 Nothing -> pprTrace "ifaceBinds not found:" (ppr id) $
388 new_idinfo | opt_OmitInterfacePragmas
391 = core_idinfo `setArityInfo` arity_info
392 `setCafInfo` cafInfo stg_idinfo
393 `setUnfoldingInfo` unfold_info
394 `setWorkerInfo` worker_info
395 `setSpecInfo` emptyCoreRules
396 -- We zap the specialisations because they are
397 -- passed on separately through the modules IdCoreRules
399 ------------ Arity --------------
400 arity_info = arityInfo stg_idinfo
401 stg_arity = arityLowerBound arity_info
403 ------------ Worker --------------
404 -- We only treat a function as having a worker if
405 -- the exported arity (which is now the number of visible lambdas)
406 -- is the same as the arity at the moment of the w/w split
407 -- If so, we can safely omit the unfolding inside the wrapper, and
408 -- instead re-generate it from the type/arity/strictness info
409 -- But if the arity has changed, we just take the simple path and
410 -- put the unfolding into the interface file, forgetting the fact
411 -- that it's a wrapper.
413 -- How can this happen? Sometimes we get
414 -- f = coerce t (\x y -> $wf x y)
415 -- at the moment of w/w split; but the eta reducer turns it into
417 -- which is perfectly fine except that the exposed arity so far as
418 -- the code generator is concerned (zero) differs from the arity
419 -- when we did the split (2).
421 -- All this arises because we use 'arity' to mean "exactly how many
422 -- top level lambdas are there" in interface files; but during the
423 -- compilation of this module it means "how many things can I apply
425 worker_info = case workerInfo core_idinfo of
426 info@(HasWorker work_id wrap_arity)
427 | wrap_arity == stg_arity -> info
428 | otherwise -> pprTrace "ifaceId: arity change:" (ppr id)
432 has_worker = case worker_info of
433 HasWorker _ _ -> True
436 HasWorker work_id _ = worker_info
438 ------------ Unfolding --------------
439 inline_pragma = inlinePragInfo core_idinfo
440 dont_inline = isNeverInlinePrag inline_pragma
441 loop_breaker = isLoopBreaker (occInfo core_idinfo)
442 bottoming_fn = isBottomingStrictness (strictnessInfo core_idinfo)
444 unfolding = mkTopUnfolding rhs
445 rhs_is_small = neverUnfold unfolding
447 unfold_info | show_unfold = unfolding
448 | otherwise = noUnfolding
450 show_unfold = not has_worker && -- Not unnecessary
451 not bottoming_fn && -- Not necessary
454 rhs_is_small && -- Small enough
455 okToUnfoldInHiFile rhs -- No casms etc
458 ------------ Extra free Ids --------------
459 new_needed_ids | opt_OmitInterfacePragmas = emptyVarSet
460 | otherwise = worker_ids `unionVarSet`
461 unfold_ids `unionVarSet`
464 spec_ids = filterVarSet interestingId (rulesRhsFreeVars (specInfo core_idinfo))
466 worker_ids | has_worker && interestingId work_id = unitVarSet work_id
467 -- Conceivably, the worker might come from
469 | otherwise = emptyVarSet
471 unfold_ids | show_unfold = find_fvs rhs
472 | otherwise = emptyVarSet
474 find_fvs expr = exprSomeFreeVars interestingId expr
476 interestingId id = isId id && isLocallyDefined id && not (hasNoBinding id)
481 getRules :: [IdCoreRule] -- Orphan rules
482 -> [CoreBind] -- Bindings, with rules in the top-level Ids
483 -> IdSet -- Ids that are exported, so we need their rules
485 getRules orphan_rules binds emitted
486 = orphan_rules ++ local_rules
488 local_rules = [ (fn, rule)
489 | fn <- bindersOfBinds binds,
490 fn `elemVarSet` emitted,
491 rule <- rulesRules (idSpecialisation fn),
492 not (isBuiltinRule rule),
493 -- We can't print builtin rules in interface files
494 -- Since they are built in, an importing module
495 -- will have access to them anyway
497 -- Sept 00: I've disabled this test. It doesn't stop many, if any, rules
498 -- from coming out, and to make it work properly we need to add ????
499 -- (put it back in for now)
500 all (`elemVarSet` emitted) (varSetElems (ruleSomeLhsFreeVars interestingId rule))
501 -- Spit out a rule only if all its lhs free vars are emitted
502 -- This is a good reason not to do it when we emit the Id itself
507 %************************************************************************
509 \subsection{Checking if the new interface is up to date
511 %************************************************************************
514 addVersionInfo :: Maybe ModIface -- The old interface, read from M.hi
515 -> ModIface -- The new interface decls
516 -> Maybe (ModIface, SDoc) -- Nothing => no change; no need to write new Iface
517 -- Just mi => Here is the new interface to write
518 -- with correct version numbers
520 -- NB: the fixities, declarations, rules are all assumed
521 -- to be sorted by increasing order of hsDeclName, so that
522 -- we can compare for equality
524 addVersionInfo Nothing new_iface
525 -- No old interface, so definitely write a new one!
526 = Just (new_iface, text "No old interface available")
528 addVersionInfo (Just old_iface@(ModIface { mi_version = old_version,
529 mi_decls = old_decls,
530 mi_fixities = old_fixities }))
531 new_iface@(ModIface { mi_decls = new_decls,
532 mi_fixities = new_fixities })
534 | no_output_change && no_usage_change
537 | otherwise -- Add updated version numbers
538 = Just (final_iface, pp_tc_diffs)
541 final_iface = new_iface { mi_version = new_version }
542 new_version = VersionInfo { vers_module = bumpVersion no_output_change (vers_module old_version),
543 vers_exports = bumpVersion no_export_change (vers_exports old_version),
544 vers_rules = bumpVersion no_rule_change (vers_rules old_version),
545 vers_decls = tc_vers }
547 no_output_change = no_tc_change && no_rule_change && no_export_change
548 no_usage_change = mi_usages old_iface == mi_usages new_iface
550 no_export_change = mi_exports old_iface == mi_exports new_iface -- Kept sorted
551 no_rule_change = dcl_rules old_decls == dcl_rules new_decls -- Ditto
553 -- Fill in the version number on the new declarations by looking at the old declarations.
554 -- Set the flag if anything changes.
555 -- Assumes that the decls are sorted by hsDeclName.
556 old_vers_decls = vers_decls old_version
557 (no_tc_change, pp_tc_diffs, tc_vers) = diffDecls old_vers_decls old_fixities new_fixities
558 (dcl_tycl old_decls) (dcl_tycl new_decls)
562 diffDecls :: NameEnv Version -- Old version map
563 -> NameEnv Fixity -> NameEnv Fixity -- Old and new fixities
564 -> [RenamedTyClDecl] -> [RenamedTyClDecl] -- Old and new decls
565 -> (Bool, -- True <=> no change
566 SDoc, -- Record of differences
567 NameEnv Version) -- New version
569 diffDecls old_vers old_fixities new_fixities old new
570 = diff True empty emptyNameEnv old new
572 -- When seeing if two decls are the same,
573 -- remember to check whether any relevant fixity has changed
574 eq_tc d1 d2 = d1 == d2 && all (same_fixity . fst) (tyClDeclNames d1)
575 same_fixity n = lookupNameEnv old_fixities n == lookupNameEnv new_fixities n
577 diff ok_so_far pp new_vers [] [] = (ok_so_far, pp, new_vers)
578 diff ok_so_far pp new_vers old [] = (False, pp, new_vers)
579 diff ok_so_far pp new_vers [] (nd:nds) = diff False (pp $$ only_new nd) new_vers [] nds
580 diff ok_so_far pp new_vers (od:ods) (nd:nds)
581 = case od_name `compare` nd_name of
582 LT -> diff False (pp $$ only_old od) new_vers ods (nd:nds)
583 GT -> diff False (pp $$ only_new nd) new_vers (od:ods) nds
584 EQ | od `eq_tc` nd -> diff ok_so_far pp new_vers ods nds
585 | otherwise -> diff False (pp $$ changed od nd) new_vers' ods nds
587 od_name = tyClDeclName od
588 nd_name = tyClDeclName nd
589 new_vers' = extendNameEnv new_vers nd_name
590 (bumpVersion True (lookupNameEnv_NF old_vers od_name))
592 only_old d = ptext SLIT("Only in old iface:") <+> ppr d
593 only_new d = ptext SLIT("Only in new iface:") <+> ppr d
594 changed d nd = ptext SLIT("Changed in iface: ") <+> ((ptext SLIT("Old:") <+> ppr d) $$
595 (ptext SLIT("New:") <+> ppr nd))
600 %************************************************************************
602 \subsection{Writing an interface file}
604 %************************************************************************
607 writeIface :: Finder -> Maybe ModIface -> IO ()
608 writeIface finder Nothing
611 writeIface finder (Just mod_iface)
612 = do { maybe_found <- finder mod_name ;
613 ; case maybe_found of {
614 Nothing -> printErrs (text "Can't write interface file for" <+> ppr mod_name) ;
617 do { let filename = hi_file locn
618 ; if_hdl <- openFile filename WriteMode
619 ; printForIface if_hdl (pprIface mod_iface)
623 mod_name = moduleName (mi_module mod_iface)
625 pprIface :: ModIface -> SDoc
627 = vcat [ ptext SLIT("__interface")
628 <+> doubleQuotes (ptext opt_InPackage)
629 <+> ppr (mi_module iface) <+> ppr (vers_module version_info)
631 <+> (if mi_orphan iface then char '!' else empty)
632 <+> int opt_HiVersion
633 <+> ptext SLIT("where")
635 , vcat (map pprExport (mi_exports iface))
636 , vcat (map pprUsage (mi_usages iface))
638 , pprIfaceDecls (vers_decls version_info)
642 , pprDeprecs (mi_deprecs iface)
645 version_info = mi_version iface
646 exp_vers = vers_exports version_info
647 rule_vers = vers_rules version_info
649 pp_sub_vers | exp_vers == initialVersion && rule_vers == initialVersion = empty
650 | otherwise = brackets (ppr exp_vers <+> ppr rule_vers)
653 When printing export lists, we print like this:
655 AvailTC C [C, x, y] C(x,y)
656 AvailTC C [x, y] C!(x,y) -- Exporting x, y but not C
659 pprExport :: (ModuleName, Avails) -> SDoc
660 pprExport (mod, items)
661 = hsep [ ptext SLIT("__export "), ppr mod, hsep (map pp_avail items) ] <> semi
663 ppr_name :: Name -> SDoc -- Print the occurrence name only
664 ppr_name n = ppr (nameOccName n)
666 pp_avail :: AvailInfo -> SDoc
667 pp_avail (Avail name) = ppr_name name
668 pp_avail (AvailTC name []) = empty
669 pp_avail (AvailTC name ns) = hcat [ppr_name name, bang, pp_export ns']
671 bang | name `elem` ns = empty
672 | otherwise = char '|'
673 ns' = filter (/= name) ns
676 pp_export names = braces (hsep (map ppr_name names))
681 pprUsage :: ImportVersion Name -> SDoc
682 pprUsage (m, has_orphans, is_boot, whats_imported)
683 = hsep [ptext SLIT("import"), ppr m,
685 pp_versions whats_imported
688 pp_orphan | has_orphans = char '!'
690 pp_boot | is_boot = char '@'
693 -- Importing the whole module is indicated by an empty list
694 pp_versions NothingAtAll = empty
695 pp_versions (Everything v) = dcolon <+> int v
696 pp_versions (Specifically vm ve nvs vr) = dcolon <+> int vm <+> pp_export_version ve <+> int vr
697 <+> hsep [ ppr n <+> int v | (n,v) <- nvs ]
699 -- HACK for the moment: print the export-list version even if
700 -- we don't use it, so that syntax of interface files doesn't change
701 pp_export_version Nothing = int 1
702 pp_export_version (Just v) = int v
706 pprIfaceDecls version_map fixity_map decls
707 = vcat [ vcat [ppr i <+> semi | i <- dcl_insts decls]
708 , vcat (map ppr_decl (dcl_tycl decls))
709 , pprRules (dcl_rules decls)
712 ppr_decl d = (ppr_vers d <+> ppr d <> semi) $$ ppr_fixes d
714 -- Print the version for the decl
715 ppr_vers d = case lookupNameEnv version_map (tyClDeclName d) of
719 -- Print fixities relevant to the decl
720 ppr_fixes d = vcat [ ppr fix <+> ppr n <> semi
721 | (n,_) <- tyClDeclNames d,
722 Just fix <- [lookupNameEnv fixity_map n]
728 pprRules rules = hsep [ptext SLIT("{-## __R"), vcat (map ppr rules), ptext SLIT("##-}")]
730 pprDeprecs NoDeprecs = empty
731 pprDeprecs deprecs = ptext SLIT("{-## __D") <+> guts <+> ptext SLIT("##-}")
733 guts = case deprecs of
734 DeprecAll txt -> ptext txt
735 DeprecSome env -> pp_deprecs env
737 pp_deprecs env = vcat (punctuate semi (map pp_deprec (nameEnvElts env)))
739 pp_deprec (name, txt) = pprOccName (nameOccName name) <+> ptext txt