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(..)
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,
47 import OccName ( pprOccName )
48 import TyCon ( TyCon, getSynTyConDefn, isSynTyCon, isNewTyCon, isAlgTyCon,
49 tyConTheta, tyConTyVars, tyConDataCons, tyConFamilySize
51 import Class ( classExtraBigSig, DefMeth(..) )
52 import FieldLabel ( fieldLabelType )
53 import Type ( splitSigmaTy, tidyTopType, deNoteType )
54 import SrcLoc ( noSrcLoc )
56 import Module ( ModuleName )
58 import List ( partition )
59 import IO ( IOMode(..), openFile, hClose )
63 %************************************************************************
65 \subsection{Write a new interface file}
67 %************************************************************************
70 mkModDetails :: TypeEnv -> [DFunId] -- From typechecker
71 -> [CoreBind] -> [Id] -- Final bindings, plus the top-level Ids from the
72 -- code generator; they have authoritative arity info
73 -> [IdCoreRule] -- Tidy orphan rules
75 mkModDetails type_env dfun_ids tidy_binds stg_ids orphan_rules
76 = ModDetails { md_types = new_type_env,
80 -- The competed type environment is gotten from
81 -- a) keeping the types and classes
82 -- b) removing all Ids, and Ids with correct IdInfo
83 -- gotten from the bindings
84 -- From (b) we keep only those Ids with Global names, plus Ids
85 -- accessible from them (notably via unfoldings)
86 -- This truncates the type environment to include only the
87 -- exported Ids and things needed from them, which saves space
89 -- However, we do keep things like constructors, which should not appear
90 -- in interface files, because they are needed by importing modules when
91 -- using the compilation manager
92 new_type_env = mkNameEnv [(getName tycl, tycl) | tycl <- orig_type_env, isTyClThing tycl]
94 mkNameEnv [(idName id, AnId id) | id <- final_ids]
96 orig_type_env = nameEnvElts type_env
98 final_ids = bindsToIds (mkVarSet dfun_ids `unionVarSet` orphan_rule_ids)
102 -- The complete rules are gotten by combining
103 -- a) the orphan rules
104 -- b) rules embedded in the top-level Ids
105 rule_dcls | opt_OmitInterfacePragmas = []
106 | otherwise = getRules orphan_rules tidy_binds (mkVarSet final_ids)
108 orphan_rule_ids = unionVarSets [ ruleSomeFreeVars interestingId rule
109 | (_, rule) <- orphan_rules]
112 -- This version is used when we are re-linking a module
113 -- so we've only run the type checker on its previous interface
114 mkModDetailsFromIface :: TypeEnv -> [DFunId] -- From typechecker
115 -> [TypecheckedRuleDecl]
117 mkModDetailsFromIface type_env dfun_ids rules
118 = ModDetails { md_types = type_env,
119 md_rules = rule_dcls,
120 md_insts = dfun_ids }
122 rule_dcls = [(id,rule) | IfaceRuleOut id rule <- rules]
123 -- All the rules from an interface are of the IfaceRuleOut form
126 completeIface :: Maybe ModIface -- The old interface, if we have it
127 -> ModIface -- The new one, minus the decls and versions
128 -> ModDetails -- The ModDetails for this module
129 -> (ModIface, Maybe SDoc) -- The new one, complete with decls and versions
130 -- The SDoc is a debug document giving differences
131 -- Nothing => no change
133 -- NB: 'Nothing' means that even the usages havn't changed, so there's no
134 -- need to write a new interface file. But even if the usages have
135 -- changed, the module version may not have.
136 completeIface maybe_old_iface new_iface mod_details
137 = addVersionInfo maybe_old_iface (new_iface { mi_decls = new_decls })
139 new_decls = IfaceDecls { dcl_tycl = ty_cls_dcls,
140 dcl_insts = inst_dcls,
141 dcl_rules = rule_dcls }
143 inst_dcls = map ifaceInstance (md_insts mod_details)
144 ty_cls_dcls = foldNameEnv ifaceTyCls [] (md_types mod_details)
145 rule_dcls = map ifaceRule (md_rules mod_details)
149 %************************************************************************
151 \subsection{Types and classes}
153 %************************************************************************
156 ifaceTyCls :: TyThing -> [RenamedTyClDecl] -> [RenamedTyClDecl]
157 ifaceTyCls (AClass clas) so_far
160 cls_decl = ClassDecl (toHsContext sc_theta)
162 (toHsTyVars clas_tyvars)
164 (map toClassOpSig op_stuff)
168 (clas_tyvars, clas_fds, sc_theta, _, op_stuff) = classExtraBigSig clas
170 toClassOpSig (sel_id, def_meth)
171 = ASSERT(sel_tyvars == clas_tyvars)
172 ClassOpSig (getName sel_id) (Just def_meth') (toHsType op_ty) noSrcLoc
174 (sel_tyvars, _, op_ty) = splitSigmaTy (idType sel_id)
175 def_meth' = case def_meth of
176 NoDefMeth -> NoDefMeth
177 GenDefMeth -> GenDefMeth
178 DefMeth id -> DefMeth (getName id)
180 ifaceTyCls (ATyCon tycon) so_far
184 ty_decl | isSynTyCon tycon
185 = TySynonym (getName tycon)(toHsTyVars tyvars)
186 (toHsType syn_ty) noSrcLoc
189 = TyData new_or_data (toHsContext (tyConTheta tycon))
192 (map ifaceConDecl (tyConDataCons tycon))
193 (tyConFamilySize tycon)
194 Nothing noSrcLoc (panic "gen1") (panic "gen2")
196 | otherwise = pprPanic "ifaceTyCls" (ppr tycon)
198 tyvars = tyConTyVars tycon
199 (_, syn_ty) = getSynTyConDefn tycon
200 new_or_data | isNewTyCon tycon = NewType
201 | otherwise = DataType
203 ifaceConDecl data_con
204 = ConDecl (getName data_con) (error "ifaceConDecl")
205 (toHsTyVars ex_tyvars)
206 (toHsContext ex_theta)
209 (tyvars1, _, ex_tyvars, ex_theta, arg_tys, tycon1) = dataConSig data_con
210 field_labels = dataConFieldLabels data_con
211 strict_marks = dataConStrictMarks data_con
212 details | null field_labels
213 = ASSERT( tycon == tycon1 && tyvars == tyvars1 )
214 VanillaCon (zipWith mk_bang_ty strict_marks arg_tys)
217 = RecCon (zipWith mk_field strict_marks field_labels)
219 mk_bang_ty NotMarkedStrict ty = Unbanged (toHsType ty)
220 mk_bang_ty (MarkedUnboxed _ _) ty = Unpacked (toHsType ty)
221 mk_bang_ty MarkedStrict ty = Banged (toHsType ty)
223 mk_field strict_mark field_label
224 = ([getName field_label], mk_bang_ty strict_mark (fieldLabelType field_label))
226 ifaceTyCls (AnId id) so_far
227 | omitIfaceSigForId id = so_far
228 | otherwise = iface_sig : so_far
230 iface_sig = IfaceSig (getName id) (toHsType id_type) hs_idinfo noSrcLoc
235 hs_idinfo | opt_OmitInterfacePragmas = []
236 | otherwise = arity_hsinfo ++ caf_hsinfo ++ cpr_hsinfo ++
237 strict_hsinfo ++ wrkr_hsinfo ++ unfold_hsinfo
239 ------------ Arity --------------
240 arity_hsinfo = case arityInfo id_info of
241 a@(ArityExactly n) -> [HsArity a]
244 ------------ Caf Info --------------
245 caf_hsinfo = case cafInfo id_info of
246 NoCafRefs -> [HsNoCafRefs]
249 ------------ CPR Info --------------
250 cpr_hsinfo = case cprInfo id_info of
251 ReturnsCPR -> [HsCprInfo]
254 ------------ Strictness --------------
255 strict_hsinfo = case strictnessInfo id_info of
256 NoStrictnessInfo -> []
257 info -> [HsStrictness info]
260 ------------ Worker --------------
261 wrkr_hsinfo = case workerInfo id_info of
262 HasWorker work_id wrap_arity -> [HsWorker (getName work_id)]
265 ------------ Unfolding --------------
266 unfold_info = unfoldingInfo id_info
267 inline_prag = inlinePragInfo id_info
268 rhs = unfoldingTemplate unfold_info
269 unfold_hsinfo | neverUnfold unfold_info = []
270 | otherwise = [HsUnfold inline_prag (toUfExpr rhs)]
274 %************************************************************************
276 \subsection{Instances and rules}
278 %************************************************************************
281 ifaceInstance :: DFunId -> RenamedInstDecl
282 ifaceInstance dfun_id
283 = InstDecl (toHsType tidy_ty) EmptyMonoBinds [] (Just (getName dfun_id)) noSrcLoc
285 tidy_ty = tidyTopType (deNoteType (idType 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.
296 ifaceRule (id, BuiltinRule _)
297 = pprTrace "toHsRule: builtin" (ppr id) (bogusIfaceRule id)
299 ifaceRule (id, Rule name bndrs args rhs)
300 = IfaceRule name (map toUfBndr bndrs) (getName id)
301 (map toUfExpr args) (toUfExpr rhs) noSrcLoc
304 = IfaceRule SLIT("bogus") [] (getName id) [] (UfVar (getName id)) noSrcLoc
308 %************************************************************************
310 \subsection{Compute final Ids}
312 %************************************************************************
314 A "final Id" has exactly the IdInfo for going into an interface file, or
315 exporting to another module.
318 bindsToIds :: IdSet -- These Ids are needed already
319 -> IdSet -- Ids used at code-gen time; they have better pragma info!
320 -> [CoreBind] -- In dependency order, later depend on earlier
321 -> [Id] -- Set of Ids actually spat out, complete with exactly the IdInfo
322 -- they need for exporting to another module
324 bindsToIds needed_ids codegen_ids binds
325 = go needed_ids (reverse binds) []
326 -- Reverse so that later things will
327 -- provoke earlier ones to be emitted
329 -- The 'needed' set contains the Ids that are needed by earlier
330 -- interface file emissions. If the Id isn't in this set, and isn't
331 -- exported, there's no need to emit anything
332 need_id needed_set id = id `elemVarSet` needed_set || isUserExportedId id
335 | not (isEmptyVarSet needed) = pprTrace "ifaceBinds: free vars:"
336 (sep (map ppr (varSetElems needed)))
338 | otherwise = emitted
340 go needed (NonRec id rhs : binds) emitted
341 | need_id needed id = go new_needed binds (new_id:emitted)
342 | otherwise = go needed binds emitted
344 (new_id, extras) = mkFinalId codegen_ids False id rhs
345 new_needed = (needed `unionVarSet` extras) `delVarSet` id
347 -- Recursive groups are a bit more of a pain. We may only need one to
348 -- start with, but it may call out the next one, and so on. So we
349 -- have to look for a fixed point. We don't want necessarily them all,
350 -- because without -O we may only need the first one (if we don't emit
352 go needed (Rec pairs : binds) emitted
353 = go needed' binds emitted'
355 (new_emitted, extras) = go_rec needed pairs
356 needed' = (needed `unionVarSet` extras) `minusVarSet` mkVarSet (map fst pairs)
357 emitted' = new_emitted ++ emitted
359 go_rec :: IdSet -> [(Id,CoreExpr)] -> ([Id], IdSet)
361 | null needed_prs = ([], emptyVarSet)
362 | otherwise = (emitted ++ more_emitted,
363 extras `unionVarSet` more_extras)
365 (needed_prs,leftover_prs) = partition is_needed pairs
366 (emitted, extras_s) = unzip [ mkFinalId codegen_ids True id rhs
367 | (id,rhs) <- needed_prs, not (omitIfaceSigForId id)]
368 extras = unionVarSets extras_s
369 (more_emitted, more_extras) = go_rec extras leftover_prs
371 is_needed (id,_) = need_id needed id
377 mkFinalId :: IdSet -- The Ids with arity info from the code generator
378 -> Bool -- True <=> recursive, so don't include unfolding
380 -> CoreExpr -- The Id's right hand side
381 -> (Id, IdSet) -- The emitted id, plus any *extra* needed Ids
383 mkFinalId codegen_ids is_rec id rhs
384 | omitIfaceSigForId id
385 = (id, emptyVarSet) -- An optimisation for top-level constructors and suchlike
387 = (id `setIdInfo` new_idinfo, new_needed_ids)
389 core_idinfo = idInfo id
390 stg_idinfo = case lookupVarSet codegen_ids id of
391 Just id' -> idInfo id'
392 Nothing -> pprTrace "ifaceBinds not found:" (ppr id) $
395 new_idinfo | opt_OmitInterfacePragmas
398 = core_idinfo `setArityInfo` arity_info
399 `setCafInfo` cafInfo stg_idinfo
400 `setUnfoldingInfo` unfold_info
401 `setWorkerInfo` worker_info
402 `setSpecInfo` emptyCoreRules
403 -- We zap the specialisations because they are
404 -- passed on separately through the modules IdCoreRules
406 ------------ Arity --------------
407 arity_info = arityInfo stg_idinfo
408 stg_arity = arityLowerBound arity_info
410 ------------ Worker --------------
411 -- We only treat a function as having a worker if
412 -- the exported arity (which is now the number of visible lambdas)
413 -- is the same as the arity at the moment of the w/w split
414 -- If so, we can safely omit the unfolding inside the wrapper, and
415 -- instead re-generate it from the type/arity/strictness info
416 -- But if the arity has changed, we just take the simple path and
417 -- put the unfolding into the interface file, forgetting the fact
418 -- that it's a wrapper.
420 -- How can this happen? Sometimes we get
421 -- f = coerce t (\x y -> $wf x y)
422 -- at the moment of w/w split; but the eta reducer turns it into
424 -- which is perfectly fine except that the exposed arity so far as
425 -- the code generator is concerned (zero) differs from the arity
426 -- when we did the split (2).
428 -- All this arises because we use 'arity' to mean "exactly how many
429 -- top level lambdas are there" in interface files; but during the
430 -- compilation of this module it means "how many things can I apply
432 worker_info = case workerInfo core_idinfo of
433 info@(HasWorker work_id wrap_arity)
434 | wrap_arity == stg_arity -> info
435 | otherwise -> pprTrace "ifaceId: arity change:" (ppr id)
439 has_worker = case worker_info of
440 HasWorker _ _ -> True
443 HasWorker work_id _ = worker_info
445 ------------ Unfolding --------------
446 inline_pragma = inlinePragInfo core_idinfo
447 dont_inline = isNeverInlinePrag inline_pragma
448 loop_breaker = isLoopBreaker (occInfo core_idinfo)
449 bottoming_fn = isBottomingStrictness (strictnessInfo core_idinfo)
451 unfolding = mkTopUnfolding rhs
452 rhs_is_small = neverUnfold unfolding
454 unfold_info | show_unfold = unfolding
455 | otherwise = noUnfolding
457 show_unfold = not has_worker && -- Not unnecessary
458 not bottoming_fn && -- Not necessary
461 rhs_is_small && -- Small enough
462 okToUnfoldInHiFile rhs -- No casms etc
465 ------------ Extra free Ids --------------
466 new_needed_ids | opt_OmitInterfacePragmas = emptyVarSet
467 | otherwise = worker_ids `unionVarSet`
468 unfold_ids `unionVarSet`
471 spec_ids = filterVarSet interestingId (rulesRhsFreeVars (specInfo core_idinfo))
473 worker_ids | has_worker && interestingId work_id = unitVarSet work_id
474 -- Conceivably, the worker might come from
476 | otherwise = emptyVarSet
478 unfold_ids | show_unfold = find_fvs rhs
479 | otherwise = emptyVarSet
481 find_fvs expr = exprSomeFreeVars interestingId expr
483 interestingId id = isId id && isLocallyDefined id && not (hasNoBinding id)
488 getRules :: [IdCoreRule] -- Orphan rules
489 -> [CoreBind] -- Bindings, with rules in the top-level Ids
490 -> IdSet -- Ids that are exported, so we need their rules
492 getRules orphan_rules binds emitted
493 = orphan_rules ++ local_rules
495 local_rules = [ (fn, rule)
496 | fn <- bindersOfBinds binds,
497 fn `elemVarSet` emitted,
498 rule <- rulesRules (idSpecialisation fn),
499 not (isBuiltinRule rule),
500 -- We can't print builtin rules in interface files
501 -- Since they are built in, an importing module
502 -- will have access to them anyway
504 -- Sept 00: I've disabled this test. It doesn't stop many, if any, rules
505 -- from coming out, and to make it work properly we need to add ????
506 -- (put it back in for now)
507 all (`elemVarSet` emitted) (varSetElems (ruleSomeLhsFreeVars interestingId rule))
508 -- Spit out a rule only if all its lhs free vars are emitted
509 -- This is a good reason not to do it when we emit the Id itself
514 %************************************************************************
516 \subsection{Checking if the new interface is up to date
518 %************************************************************************
521 addVersionInfo :: Maybe ModIface -- The old interface, read from M.hi
522 -> ModIface -- The new interface decls
523 -> (ModIface, Maybe SDoc) -- Nothing => no change; no need to write new Iface
524 -- Just mi => Here is the new interface to write
525 -- with correct version numbers
527 -- NB: the fixities, declarations, rules are all assumed
528 -- to be sorted by increasing order of hsDeclName, so that
529 -- we can compare for equality
531 addVersionInfo Nothing new_iface
532 -- No old interface, so definitely write a new one!
533 = (new_iface, Just (text "No old interface available"))
535 addVersionInfo (Just old_iface@(ModIface { mi_version = old_version,
536 mi_decls = old_decls,
537 mi_fixities = old_fixities }))
538 new_iface@(ModIface { mi_decls = new_decls,
539 mi_fixities = new_fixities })
541 | no_output_change && no_usage_change
542 = (old_iface, Nothing)
544 | otherwise -- Add updated version numbers
545 = (final_iface, Just pp_tc_diffs)
548 final_iface = new_iface { mi_version = new_version }
549 new_version = VersionInfo { vers_module = bumpVersion no_output_change (vers_module old_version),
550 vers_exports = bumpVersion no_export_change (vers_exports old_version),
551 vers_rules = bumpVersion no_rule_change (vers_rules old_version),
552 vers_decls = tc_vers }
554 no_output_change = no_tc_change && no_rule_change && no_export_change
555 no_usage_change = mi_usages old_iface == mi_usages new_iface
557 no_export_change = mi_exports old_iface == mi_exports new_iface -- Kept sorted
558 no_rule_change = dcl_rules old_decls == dcl_rules new_decls -- Ditto
560 -- Fill in the version number on the new declarations by looking at the old declarations.
561 -- Set the flag if anything changes.
562 -- Assumes that the decls are sorted by hsDeclName.
563 old_vers_decls = vers_decls old_version
564 (no_tc_change, pp_tc_diffs, tc_vers) = diffDecls old_vers_decls old_fixities new_fixities
565 (dcl_tycl old_decls) (dcl_tycl new_decls)
569 diffDecls :: NameEnv Version -- Old version map
570 -> NameEnv Fixity -> NameEnv Fixity -- Old and new fixities
571 -> [RenamedTyClDecl] -> [RenamedTyClDecl] -- Old and new decls
572 -> (Bool, -- True <=> no change
573 SDoc, -- Record of differences
574 NameEnv Version) -- New version
576 diffDecls old_vers old_fixities new_fixities old new
577 = diff True empty emptyNameEnv old new
579 -- When seeing if two decls are the same,
580 -- remember to check whether any relevant fixity has changed
581 eq_tc d1 d2 = d1 == d2 && all (same_fixity . fst) (tyClDeclNames d1)
582 same_fixity n = lookupNameEnv old_fixities n == lookupNameEnv new_fixities n
584 diff ok_so_far pp new_vers [] [] = (ok_so_far, pp, new_vers)
585 diff ok_so_far pp new_vers old [] = (False, pp, new_vers)
586 diff ok_so_far pp new_vers [] (nd:nds) = diff False (pp $$ only_new nd) new_vers [] nds
587 diff ok_so_far pp new_vers (od:ods) (nd:nds)
588 = case od_name `compare` nd_name of
589 LT -> diff False (pp $$ only_old od) new_vers ods (nd:nds)
590 GT -> diff False (pp $$ only_new nd) new_vers (od:ods) nds
591 EQ | od `eq_tc` nd -> diff ok_so_far pp new_vers ods nds
592 | otherwise -> diff False (pp $$ changed od nd) new_vers' ods nds
594 od_name = tyClDeclName od
595 nd_name = tyClDeclName nd
596 new_vers' = extendNameEnv new_vers nd_name
597 (bumpVersion True (lookupNameEnv_NF old_vers od_name))
599 only_old d = ptext SLIT("Only in old iface:") <+> ppr d
600 only_new d = ptext SLIT("Only in new iface:") <+> ppr d
601 changed d nd = ptext SLIT("Changed in iface: ") <+> ((ptext SLIT("Old:") <+> ppr d) $$
602 (ptext SLIT("New:") <+> ppr nd))
607 %************************************************************************
609 \subsection{Writing an interface file}
611 %************************************************************************
614 writeIface :: FilePath -> ModIface -> IO ()
615 writeIface hi_path mod_iface
616 = do { if_hdl <- openFile hi_path WriteMode
617 ; printForIface if_hdl (pprIface mod_iface)
621 pprIface :: ModIface -> SDoc
623 = vcat [ ptext SLIT("__interface")
624 <+> doubleQuotes (ptext opt_InPackage)
625 <+> ppr (mi_module iface) <+> ppr (vers_module version_info)
627 <+> (if mi_orphan iface then char '!' else empty)
628 <+> int opt_HiVersion
629 <+> ptext SLIT("where")
631 , vcat (map pprExport (mi_exports iface))
632 , vcat (map pprUsage (mi_usages iface))
634 , pprFixities (mi_fixities iface) (dcl_tycl decls)
635 , pprIfaceDecls (vers_decls version_info) decls
636 , pprDeprecs (mi_deprecs iface)
639 version_info = mi_version iface
640 decls = mi_decls iface
641 exp_vers = vers_exports version_info
642 rule_vers = vers_rules version_info
644 pp_sub_vers | exp_vers == initialVersion && rule_vers == initialVersion = empty
645 | otherwise = brackets (ppr exp_vers <+> ppr rule_vers)
648 When printing export lists, we print like this:
650 AvailTC C [C, x, y] C(x,y)
651 AvailTC C [x, y] C!(x,y) -- Exporting x, y but not C
654 pprExport :: (ModuleName, Avails) -> SDoc
655 pprExport (mod, items)
656 = hsep [ ptext SLIT("__export "), ppr mod, hsep (map pp_avail items) ] <> semi
658 pp_avail :: AvailInfo -> SDoc
659 pp_avail (Avail name) = pprOcc name
660 pp_avail (AvailTC n []) = empty
661 pp_avail (AvailTC n (n':ns)) | n==n' = pprOcc n <> pp_export ns
662 | otherwise = pprOcc n <> char '|' <> pp_export (n':ns)
665 pp_export names = braces (hsep (map pprOcc names))
667 pprOcc :: Name -> SDoc -- Print the occurrence name only
668 pprOcc n = pprOccName (nameOccName n)
673 pprUsage :: ImportVersion Name -> SDoc
674 pprUsage (m, has_orphans, is_boot, whats_imported)
675 = hsep [ptext SLIT("import"), ppr m,
677 pp_versions whats_imported
680 pp_orphan | has_orphans = char '!'
682 pp_boot | is_boot = char '@'
685 -- Importing the whole module is indicated by an empty list
686 pp_versions NothingAtAll = empty
687 pp_versions (Everything v) = dcolon <+> int v
688 pp_versions (Specifically vm ve nvs vr) = dcolon <+> int vm <+> pp_export_version ve <+> int vr
689 <+> hsep [ pprOcc n <+> int v | (n,v) <- nvs ]
691 -- HACK for the moment: print the export-list version even if
692 -- we don't use it, so that syntax of interface files doesn't change
693 pp_export_version Nothing = int 1
694 pp_export_version (Just v) = int v
698 pprIfaceDecls version_map decls
699 = vcat [ vcat [ppr i <+> semi | i <- dcl_insts decls]
700 , vcat (map ppr_decl (dcl_tycl decls))
701 , pprRules (dcl_rules decls)
704 ppr_decl d = ppr_vers d <+> ppr d <> semi
706 -- Print the version for the decl
707 ppr_vers d = case lookupNameEnv version_map (tyClDeclName d) of
713 pprFixities fixity_map decls
714 = hsep [ ppr fix <+> ppr n
716 (n,_) <- tyClDeclNames d,
717 Just fix <- [lookupNameEnv fixity_map n]] <> semi
720 pprRules rules = hsep [ptext SLIT("{-## __R"), vcat (map ppr rules), ptext SLIT("##-}")]
722 pprDeprecs NoDeprecs = empty
723 pprDeprecs deprecs = ptext SLIT("{-## __D") <+> guts <+> ptext SLIT("##-}")
725 guts = case deprecs of
726 DeprecAll txt -> ptext txt
727 DeprecSome env -> pp_deprecs env
729 pp_deprecs env = vcat (punctuate semi (map pp_deprec (nameEnvElts env)))
731 pp_deprec (name, txt) = pprOcc name <+> ptext txt