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(..), RdrAvailInfo,
29 import Id ( Id, idType, idInfo, omitIfaceSigForId, isUserExportedId, hasNoBinding,
30 idSpecialisation, idName, setIdInfo
34 import DataCon ( StrictnessMark(..), dataConSig, dataConFieldLabels, dataConStrictMarks )
36 import CoreSyn ( CoreExpr, CoreBind, Bind(..), CoreRule(..), IdCoreRule,
37 isBuiltinRule, rulesRules, rulesRhsFreeVars, emptyCoreRules,
40 import CoreFVs ( exprSomeFreeVars, ruleSomeLhsFreeVars, ruleSomeFreeVars )
41 import CoreUnfold ( okToUnfoldInHiFile, mkTopUnfolding, neverUnfold, unfoldingTemplate, noUnfolding )
42 import Name ( isLocallyDefined, getName,
44 plusNameEnv, lookupNameEnv, emptyNameEnv, mkNameEnv,
45 extendNameEnv, lookupNameEnv_NF, nameEnvElts
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, 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 new_type_env = mkNameEnv [(getName tycl, tycl) | tycl <- orig_type_env, isTyClThing tycl]
86 mkNameEnv [(idName id, AnId id) | id <- final_ids]
88 orig_type_env = nameEnvElts type_env
90 final_ids = bindsToIds (mkVarSet dfun_ids `unionVarSet` orphan_rule_ids)
94 -- The complete rules are gotten by combining
95 -- a) the orphan rules
96 -- b) rules embedded in the top-level Ids
97 rule_dcls | opt_OmitInterfacePragmas = []
98 | otherwise = getRules orphan_rules tidy_binds (mkVarSet final_ids)
100 orphan_rule_ids = unionVarSets [ ruleSomeFreeVars interestingId rule
101 | (_, rule) <- orphan_rules]
104 -- This version is used when we are re-linking a module
105 -- so we've only run the type checker on its previous interface
106 mkModDetailsFromIface :: TypeEnv -> [DFunId] -- From typechecker
107 -> [TypecheckedRuleDecl]
109 mkModDetailsFromIface type_env dfun_ids rules
110 = ModDetails { md_types = type_env,
111 md_rules = rule_dcls,
112 md_insts = dfun_ids }
114 rule_dcls = [(id,rule) | IfaceRuleOut id rule <- rules]
115 -- All the rules from an interface are of the IfaceRuleOut form
118 completeIface :: Maybe ModIface -- The old interface, if we have it
119 -> ModIface -- The new one, minus the decls and versions
120 -> ModDetails -- The ModDetails for this module
121 -> Maybe (ModIface, SDoc) -- The new one, complete with decls and versions
122 -- The SDoc is a debug document giving differences
123 -- Nothing => no change
125 -- NB: 'Nothing' means that even the usages havn't changed, so there's no
126 -- need to write a new interface file. But even if the usages have
127 -- changed, the module version may not have.
129 -- The IO in the type is solely for debug output
130 -- In particular, dumping a record of what has changed
131 completeIface maybe_old_iface new_iface mod_details
132 = addVersionInfo maybe_old_iface (new_iface { mi_decls = new_decls })
134 new_decls = IfaceDecls { dcl_tycl = ty_cls_dcls,
135 dcl_insts = inst_dcls,
136 dcl_rules = rule_dcls }
138 inst_dcls = map ifaceInstance (md_insts mod_details)
139 ty_cls_dcls = map ifaceTyCls (nameEnvElts (md_types mod_details))
140 rule_dcls = map ifaceRule (md_rules mod_details)
144 %************************************************************************
146 \subsection{Types and classes}
148 %************************************************************************
151 ifaceTyCls :: TyThing -> RenamedTyClDecl
152 ifaceTyCls (AClass clas)
153 = ClassDecl (toHsContext sc_theta)
155 (toHsTyVars clas_tyvars)
157 (map toClassOpSig op_stuff)
161 (clas_tyvars, clas_fds, sc_theta, _, op_stuff) = classExtraBigSig clas
163 toClassOpSig (sel_id, def_meth)
164 = ASSERT(sel_tyvars == clas_tyvars)
165 ClassOpSig (getName sel_id) (Just def_meth') (toHsType op_ty) noSrcLoc
167 (sel_tyvars, _, op_ty) = splitSigmaTy (idType sel_id)
168 def_meth' = case def_meth of
169 NoDefMeth -> NoDefMeth
170 GenDefMeth -> GenDefMeth
171 DefMeth id -> DefMeth (getName id)
173 ifaceTyCls (ATyCon tycon)
175 = TySynonym (getName tycon)(toHsTyVars tyvars) (toHsType ty) noSrcLoc
177 (tyvars, ty) = getSynTyConDefn tycon
179 ifaceTyCls (ATyCon tycon)
181 = TyData new_or_data (toHsContext (tyConTheta tycon))
184 (map ifaceConDecl (tyConDataCons tycon))
185 (tyConFamilySize tycon)
186 Nothing noSrcLoc (panic "gen1") (panic "gen2")
188 tyvars = tyConTyVars tycon
189 new_or_data | isNewTyCon tycon = NewType
190 | otherwise = DataType
192 ifaceConDecl data_con
193 = ConDecl (getName data_con) (error "ifaceConDecl")
194 (toHsTyVars ex_tyvars)
195 (toHsContext ex_theta)
198 (tyvars1, _, ex_tyvars, ex_theta, arg_tys, tycon1) = dataConSig data_con
199 field_labels = dataConFieldLabels data_con
200 strict_marks = dataConStrictMarks data_con
201 details | null field_labels
202 = ASSERT( tycon == tycon1 && tyvars == tyvars1 )
203 VanillaCon (zipWith mk_bang_ty strict_marks arg_tys)
206 = RecCon (zipWith mk_field strict_marks field_labels)
208 mk_bang_ty NotMarkedStrict ty = Unbanged (toHsType ty)
209 mk_bang_ty (MarkedUnboxed _ _) ty = Unpacked (toHsType ty)
210 mk_bang_ty MarkedStrict ty = Banged (toHsType ty)
212 mk_field strict_mark field_label
213 = ([getName field_label], mk_bang_ty strict_mark (fieldLabelType field_label))
215 ifaceTyCls (ATyCon tycon) = pprPanic "ifaceTyCls" (ppr tycon)
218 = IfaceSig (getName id) (toHsType id_type) hs_idinfo noSrcLoc
223 hs_idinfo | opt_OmitInterfacePragmas = []
224 | otherwise = arity_hsinfo ++ caf_hsinfo ++ cpr_hsinfo ++
225 strict_hsinfo ++ wrkr_hsinfo ++ unfold_hsinfo
227 ------------ Arity --------------
228 arity_hsinfo = case arityInfo id_info of
229 a@(ArityExactly n) -> [HsArity a]
232 ------------ Caf Info --------------
233 caf_hsinfo = case cafInfo id_info of
234 NoCafRefs -> [HsNoCafRefs]
237 ------------ CPR Info --------------
238 cpr_hsinfo = case cprInfo id_info of
239 ReturnsCPR -> [HsCprInfo]
242 ------------ Strictness --------------
243 strict_hsinfo = case strictnessInfo id_info of
244 NoStrictnessInfo -> []
245 info -> [HsStrictness info]
248 ------------ Worker --------------
249 wrkr_hsinfo = case workerInfo id_info of
250 HasWorker work_id wrap_arity -> [HsWorker (getName work_id)]
253 ------------ Unfolding --------------
254 unfold_info = unfoldingInfo id_info
255 inline_prag = inlinePragInfo id_info
256 rhs = unfoldingTemplate unfold_info
257 unfold_hsinfo | neverUnfold unfold_info = []
258 | otherwise = [HsUnfold inline_prag (toUfExpr rhs)]
262 %************************************************************************
264 \subsection{Instances and rules}
266 %************************************************************************
269 ifaceInstance :: DFunId -> RenamedInstDecl
270 ifaceInstance dfun_id
271 = InstDecl (toHsType tidy_ty) EmptyMonoBinds [] (Just (getName dfun_id)) noSrcLoc
273 tidy_ty = tidyTopType (deNoteType (idType dfun_id))
274 -- The deNoteType is very important. It removes all type
275 -- synonyms from the instance type in interface files.
276 -- That in turn makes sure that when reading in instance decls
277 -- from interface files that the 'gating' mechanism works properly.
278 -- Otherwise you could have
279 -- type Tibble = T Int
280 -- instance Foo Tibble where ...
281 -- and this instance decl wouldn't get imported into a module
282 -- that mentioned T but not Tibble.
284 ifaceRule (id, BuiltinRule _)
285 = pprTrace "toHsRule: builtin" (ppr id) (bogusIfaceRule id)
287 ifaceRule (id, Rule name bndrs args rhs)
288 = IfaceRule name (map toUfBndr bndrs) (getName id)
289 (map toUfExpr args) (toUfExpr rhs) noSrcLoc
292 = IfaceRule SLIT("bogus") [] (getName id) [] (UfVar (getName id)) noSrcLoc
296 %************************************************************************
298 \subsection{Compute final Ids}
300 %************************************************************************
302 A "final Id" has exactly the IdInfo for going into an interface file, or
303 exporting to another module.
306 bindsToIds :: IdSet -- These Ids are needed already
307 -> IdSet -- Ids used at code-gen time; they have better pragma info!
308 -> [CoreBind] -- In dependency order, later depend on earlier
309 -> [Id] -- Set of Ids actually spat out, complete with exactly the IdInfo
310 -- they need for exporting to another module
312 bindsToIds needed_ids codegen_ids binds
313 = go needed_ids (reverse binds) []
314 -- Reverse so that later things will
315 -- provoke earlier ones to be emitted
317 -- The 'needed' set contains the Ids that are needed by earlier
318 -- interface file emissions. If the Id isn't in this set, and isn't
319 -- exported, there's no need to emit anything
320 need_id needed_set id = id `elemVarSet` needed_set || isUserExportedId id
323 | not (isEmptyVarSet needed) = pprTrace "ifaceBinds: free vars:"
324 (sep (map ppr (varSetElems needed)))
326 | otherwise = emitted
328 go needed (NonRec id rhs : binds) emitted
330 = if omitIfaceSigForId id then
331 go (needed `delVarSet` id) binds (id:emitted)
333 go ((needed `unionVarSet` extras) `delVarSet` id)
337 = go needed binds emitted
339 (new_id, extras) = mkFinalId codegen_ids False id rhs
341 -- Recursive groups are a bit more of a pain. We may only need one to
342 -- start with, but it may call out the next one, and so on. So we
343 -- have to look for a fixed point. We don't want necessarily them all,
344 -- because without -O we may only need the first one (if we don't emit
346 go needed (Rec pairs : binds) emitted
347 = go needed' binds emitted'
349 (new_emitted, extras) = go_rec needed pairs
350 needed' = (needed `unionVarSet` extras) `minusVarSet` mkVarSet (map fst pairs)
351 emitted' = new_emitted ++ emitted
353 go_rec :: IdSet -> [(Id,CoreExpr)] -> ([Id], IdSet)
355 | null needed_prs = ([], emptyVarSet)
356 | otherwise = (emitted ++ more_emitted,
357 extras `unionVarSet` more_extras)
359 (needed_prs,leftover_prs) = partition is_needed pairs
360 (emitted, extras_s) = unzip [ mkFinalId codegen_ids True id rhs
361 | (id,rhs) <- needed_prs, not (omitIfaceSigForId id)]
362 extras = unionVarSets extras_s
363 (more_emitted, more_extras) = go_rec extras leftover_prs
365 is_needed (id,_) = need_id needed id
371 mkFinalId :: IdSet -- The Ids with arity info from the code generator
372 -> Bool -- True <=> recursive, so don't include unfolding
374 -> CoreExpr -- The Id's right hand side
375 -> (Id, IdSet) -- The emitted id, plus any *extra* needed Ids
377 mkFinalId codegen_ids is_rec id rhs
378 = (id `setIdInfo` new_idinfo, new_needed_ids)
380 core_idinfo = idInfo id
381 stg_idinfo = case lookupVarSet codegen_ids id of
382 Just id' -> idInfo id'
383 Nothing -> pprTrace "ifaceBinds not found:" (ppr id) $
386 new_idinfo | opt_OmitInterfacePragmas
389 = core_idinfo `setArityInfo` arity_info
390 `setCafInfo` cafInfo stg_idinfo
391 `setUnfoldingInfo` unfold_info
392 `setWorkerInfo` worker_info
393 `setSpecInfo` emptyCoreRules
394 -- We zap the specialisations because they are
395 -- passed on separately through the modules IdCoreRules
397 ------------ Arity --------------
398 arity_info = arityInfo stg_idinfo
399 stg_arity = arityLowerBound arity_info
401 ------------ Worker --------------
402 -- We only treat a function as having a worker if
403 -- the exported arity (which is now the number of visible lambdas)
404 -- is the same as the arity at the moment of the w/w split
405 -- If so, we can safely omit the unfolding inside the wrapper, and
406 -- instead re-generate it from the type/arity/strictness info
407 -- But if the arity has changed, we just take the simple path and
408 -- put the unfolding into the interface file, forgetting the fact
409 -- that it's a wrapper.
411 -- How can this happen? Sometimes we get
412 -- f = coerce t (\x y -> $wf x y)
413 -- at the moment of w/w split; but the eta reducer turns it into
415 -- which is perfectly fine except that the exposed arity so far as
416 -- the code generator is concerned (zero) differs from the arity
417 -- when we did the split (2).
419 -- All this arises because we use 'arity' to mean "exactly how many
420 -- top level lambdas are there" in interface files; but during the
421 -- compilation of this module it means "how many things can I apply
423 worker_info = case workerInfo core_idinfo of
424 info@(HasWorker work_id wrap_arity)
425 | wrap_arity == stg_arity -> info
426 | otherwise -> pprTrace "ifaceId: arity change:" (ppr id)
430 has_worker = case worker_info of
431 HasWorker _ _ -> True
434 HasWorker work_id _ = worker_info
436 ------------ Unfolding --------------
437 inline_pragma = inlinePragInfo core_idinfo
438 dont_inline = isNeverInlinePrag inline_pragma
439 loop_breaker = isLoopBreaker (occInfo core_idinfo)
440 bottoming_fn = isBottomingStrictness (strictnessInfo core_idinfo)
442 unfolding = mkTopUnfolding rhs
443 rhs_is_small = neverUnfold unfolding
445 unfold_info | show_unfold = unfolding
446 | otherwise = noUnfolding
448 show_unfold = not has_worker && -- Not unnecessary
449 not bottoming_fn && -- Not necessary
452 rhs_is_small && -- Small enough
453 okToUnfoldInHiFile rhs -- No casms etc
456 ------------ Extra free Ids --------------
457 new_needed_ids | opt_OmitInterfacePragmas = emptyVarSet
458 | otherwise = worker_ids `unionVarSet`
459 unfold_ids `unionVarSet`
462 spec_ids = filterVarSet interestingId (rulesRhsFreeVars (specInfo core_idinfo))
464 worker_ids | has_worker && interestingId work_id = unitVarSet work_id
465 -- Conceivably, the worker might come from
467 | otherwise = emptyVarSet
469 unfold_ids | show_unfold = find_fvs rhs
470 | otherwise = emptyVarSet
472 find_fvs expr = exprSomeFreeVars interestingId expr
474 interestingId id = isId id && isLocallyDefined id && not (hasNoBinding id)
479 getRules :: [IdCoreRule] -- Orphan rules
480 -> [CoreBind] -- Bindings, with rules in the top-level Ids
481 -> IdSet -- Ids that are exported, so we need their rules
483 getRules orphan_rules binds emitted
484 = orphan_rules ++ local_rules
486 local_rules = [ (fn, rule)
487 | fn <- bindersOfBinds binds,
488 fn `elemVarSet` emitted,
489 rule <- rulesRules (idSpecialisation fn),
490 not (isBuiltinRule rule),
491 -- We can't print builtin rules in interface files
492 -- Since they are built in, an importing module
493 -- will have access to them anyway
495 -- Sept 00: I've disabled this test. It doesn't stop many, if any, rules
496 -- from coming out, and to make it work properly we need to add ????
497 -- (put it back in for now)
498 all (`elemVarSet` emitted) (varSetElems (ruleSomeLhsFreeVars interestingId rule))
499 -- Spit out a rule only if all its lhs free vars are emitted
500 -- This is a good reason not to do it when we emit the Id itself
505 %************************************************************************
507 \subsection{Checking if the new interface is up to date
509 %************************************************************************
512 addVersionInfo :: Maybe ModIface -- The old interface, read from M.hi
513 -> ModIface -- The new interface decls
514 -> Maybe (ModIface, SDoc) -- Nothing => no change; no need to write new Iface
515 -- Just mi => Here is the new interface to write
516 -- with correct version numbers
518 -- NB: the fixities, declarations, rules are all assumed
519 -- to be sorted by increasing order of hsDeclName, so that
520 -- we can compare for equality
522 addVersionInfo Nothing new_iface
523 -- No old interface, so definitely write a new one!
524 = Just (new_iface, text "No old interface available")
526 addVersionInfo (Just old_iface@(ModIface { mi_version = old_version,
527 mi_decls = old_decls,
528 mi_fixities = old_fixities }))
529 new_iface@(ModIface { mi_decls = new_decls,
530 mi_fixities = new_fixities })
532 | no_output_change && no_usage_change
535 | otherwise -- Add updated version numbers
536 = Just (final_iface, pp_tc_diffs)
539 final_iface = new_iface { mi_version = new_version }
540 new_version = VersionInfo { vers_module = bumpVersion no_output_change (vers_module old_version),
541 vers_exports = bumpVersion no_export_change (vers_exports old_version),
542 vers_rules = bumpVersion no_rule_change (vers_rules old_version),
543 vers_decls = tc_vers }
545 no_output_change = no_tc_change && no_rule_change && no_export_change
546 no_usage_change = mi_usages old_iface == mi_usages new_iface
548 no_export_change = mi_exports old_iface == mi_exports new_iface -- Kept sorted
549 no_rule_change = dcl_rules old_decls == dcl_rules new_decls -- Ditto
551 -- Fill in the version number on the new declarations by looking at the old declarations.
552 -- Set the flag if anything changes.
553 -- Assumes that the decls are sorted by hsDeclName.
554 old_vers_decls = vers_decls old_version
555 (no_tc_change, pp_tc_diffs, tc_vers) = diffDecls old_vers_decls old_fixities new_fixities
556 (dcl_tycl old_decls) (dcl_tycl new_decls)
560 diffDecls :: NameEnv Version -- Old version map
561 -> NameEnv Fixity -> NameEnv Fixity -- Old and new fixities
562 -> [RenamedTyClDecl] -> [RenamedTyClDecl] -- Old and new decls
563 -> (Bool, -- True <=> no change
564 SDoc, -- Record of differences
565 NameEnv Version) -- New version
567 diffDecls old_vers old_fixities new_fixities old new
568 = diff True empty emptyNameEnv old new
570 -- When seeing if two decls are the same,
571 -- remember to check whether any relevant fixity has changed
572 eq_tc d1 d2 = d1 == d2 && all (same_fixity . fst) (tyClDeclNames d1)
573 same_fixity n = lookupNameEnv old_fixities n == lookupNameEnv new_fixities n
575 diff ok_so_far pp new_vers [] [] = (ok_so_far, pp, new_vers)
576 diff ok_so_far pp new_vers old [] = (False, pp, new_vers)
577 diff ok_so_far pp new_vers [] (nd:nds) = diff False (pp $$ only_new nd) new_vers [] nds
578 diff ok_so_far pp new_vers (od:ods) (nd:nds)
579 = case od_name `compare` nd_name of
580 LT -> diff False (pp $$ only_old od) new_vers ods (nd:nds)
581 GT -> diff False (pp $$ only_new nd) new_vers (od:ods) nds
582 EQ | od `eq_tc` nd -> diff ok_so_far pp new_vers ods nds
583 | otherwise -> diff False (pp $$ changed od nd) new_vers' ods nds
585 od_name = tyClDeclName od
586 nd_name = tyClDeclName nd
587 new_vers' = extendNameEnv new_vers nd_name
588 (bumpVersion True (lookupNameEnv_NF old_vers od_name))
590 only_old d = ptext SLIT("Only in old iface:") <+> ppr d
591 only_new d = ptext SLIT("Only in new iface:") <+> ppr d
592 changed d nd = ptext SLIT("Changed in iface: ") <+> ((ptext SLIT("Old:") <+> ppr d) $$
593 (ptext SLIT("New:") <+> ppr nd))
598 %************************************************************************
600 \subsection{Writing an interface file}
602 %************************************************************************
605 --writeIface :: Finder -> ModIface -> IO ()
606 writeIface {-finder-} mod_iface
607 = do { let filename = error "... find the right file..."
608 ; if_hdl <- openFile filename WriteMode
609 ; printForIface if_hdl (pprIface mod_iface)
614 = vcat [ ptext SLIT("__interface")
615 <+> doubleQuotes (ptext opt_InPackage)
616 <+> ppr (mi_module iface) <+> ppr (vers_module version_info)
618 <+> (if mi_orphan iface then char '!' else empty)
619 <+> int opt_HiVersion
620 <+> ptext SLIT("where")
622 , pprExport (mi_exports iface)
623 , vcat (map pprUsage (mi_usages iface))
625 , pprIfaceDecls (vers_decls version_info)
629 , pprDeprecs (mi_deprecs iface)
632 version_info = mi_version iface
633 exp_vers = vers_exports version_info
634 rule_vers = vers_rules version_info
636 pp_sub_vers | exp_vers == initialVersion && rule_vers == initialVersion = empty
637 | otherwise = brackets (ppr exp_vers <+> ppr rule_vers)
640 When printing export lists, we print like this:
642 AvailTC C [C, x, y] C(x,y)
643 AvailTC C [x, y] C!(x,y) -- Exporting x, y but not C
646 pprExport :: (ModuleName, Avails) -> SDoc
647 pprExport (mod, items)
648 = hsep [ ptext SLIT("__export "), ppr mod, hsep (map pp_avail items) ] <> semi
650 pp_avail :: RdrAvailInfo -> SDoc
651 pp_avail (Avail name) = pprOccName name
652 pp_avail (AvailTC name []) = empty
653 pp_avail (AvailTC name ns) = hcat [pprOccName name, bang, pp_export ns']
655 bang | name `elem` ns = empty
656 | otherwise = char '|'
657 ns' = filter (/= name) ns
660 pp_export names = braces (hsep (map pprOccName names))
665 pprUsage :: ImportVersion Name -> SDoc
666 pprUsage (m, has_orphans, is_boot, whats_imported)
667 = hsep [ptext SLIT("import"), ppr (moduleName m),
669 pp_versions whats_imported
672 pp_orphan | has_orphans = char '!'
674 pp_boot | is_boot = char '@'
677 -- Importing the whole module is indicated by an empty list
678 pp_versions NothingAtAll = empty
679 pp_versions (Everything v) = dcolon <+> int v
680 pp_versions (Specifically vm ve nvs vr) = dcolon <+> int vm <+> pp_export_version ve <+> int vr
681 <+> hsep [ ppr n <+> int v | (n,v) <- nvs ]
683 -- HACK for the moment: print the export-list version even if
684 -- we don't use it, so that syntax of interface files doesn't change
685 pp_export_version Nothing = int 1
686 pp_export_version (Just v) = int v
690 pprIfaceDecls version_map fixity_map decls
691 = vcat [ vcat [ppr i <+> semi | i <- dcl_insts decls]
692 , vcat (map ppr_decl (dcl_tycl decls))
693 , pprRules (dcl_rules decls)
696 ppr_decl d = (ppr_vers d <+> ppr d <> semi) $$ ppr_fixes d
698 -- Print the version for the decl
699 ppr_vers d = case lookupNameEnv version_map (tyClDeclName d) of
703 -- Print fixities relevant to the decl
704 ppr_fixes d = vcat (map ppr_fix d)
705 ppr_fix d = [ ppr fix <+> ppr n <> semi
706 | n <- tyClDeclNames d,
707 [Just fix] <- lookupNameEnv fixity_map n
713 pprRules rules = hsep [ptext SLIT("{-## __R"), vcat (map ppr rules), ptext SLIT("##-}")]
715 pprDeprecs [] = empty
716 pprDeprecs deps = hsep [ ptext SLIT("{-## __D"), guts, ptext SLIT("##-}")]
718 guts = hsep [ ppr ie <+> doubleQuotes (ppr txt) <> semi
719 | Deprecation ie txt _ <- deps ]