2 % (c) The GRASP/AQUA Project, Glasgow University, 1993-1998
5 \section[MkIface]{Print an interface for a module}
10 pprModDetails, pprIface, pprUsage,
14 #include "HsVersions.h"
17 import HsCore ( HsIdInfo(..), UfExpr(..), toUfExpr, toUfBndr )
18 import HsTypes ( toHsTyVars )
19 import TysPrim ( alphaTyVars )
20 import BasicTypes ( Fixity(..), NewOrData(..),
21 Version, initialVersion, bumpVersion,
24 import RnHsSyn ( RenamedInstDecl, RenamedTyClDecl )
25 import HscTypes ( VersionInfo(..), ModIface(..), ModDetails(..),
26 ModuleLocation(..), GhciMode(..),
27 IfaceDecls, mkIfaceDecls, dcl_tycl, dcl_rules, dcl_insts,
28 TyThing(..), DFunId, Avails,
29 WhatsImported(..), GenAvailInfo(..),
30 ImportVersion, AvailInfo, Deprecations(..),
35 import Id ( idType, idInfo, isImplicitId, idCgInfo,
38 import DataCon ( dataConId, dataConSig, dataConFieldLabels, dataConStrictMarks )
40 import CoreSyn ( CoreRule(..) )
41 import CoreFVs ( ruleLhsFreeNames )
42 import CoreUnfold ( neverUnfold, unfoldingTemplate )
43 import PprCore ( pprIdCoreRule )
44 import Name ( getName, nameModule, toRdrName, isGlobalName,
45 nameIsLocalOrFrom, Name, NamedThing(..) )
48 import OccName ( pprOccName )
49 import TyCon ( TyCon, getSynTyConDefn, isSynTyCon, isNewTyCon,
50 isAlgTyCon, tyConGenIds, tyConTheta, tyConTyVars,
51 tyConDataCons, tyConFamilySize, isPrimTyCon,
52 isClassTyCon, isForeignTyCon, tyConArity
54 import Class ( classExtraBigSig, classTyCon, DefMeth(..) )
55 import FieldLabel ( fieldLabelType )
56 import TcType ( tcSplitSigmaTy, tidyTopType, deNoteType, namesOfDFunHead )
57 import SrcLoc ( noSrcLoc )
59 import Module ( ModuleName )
60 import Util ( sortLt )
61 import ErrUtils ( dumpIfSet_dyn )
64 import IO ( IOMode(..), openFile, hClose )
68 %************************************************************************
70 \subsection{Completing an interface}
72 %************************************************************************
78 mkFinalIface :: GhciMode
81 -> Maybe ModIface -- The old interface, if we have it
82 -> ModIface -- The new one, minus the decls and versions
83 -> ModDetails -- The ModDetails for this module
84 -> IO ModIface -- The new one, complete with decls and versions
86 -- a) completes the interface
87 -- b) writes it out to a file if necessary
89 mkFinalIface ghci_mode dflags location
90 maybe_old_iface new_iface new_details
92 -- Add the new declarations, and the is-orphan flag
93 let iface_w_decls = new_iface { mi_decls = new_decls,
94 mi_orphan = orphan_mod }
96 -- Add version information
97 ; let (final_iface, maybe_diffs) = addVersionInfo maybe_old_iface iface_w_decls
99 -- Write the interface file, if necessary
100 ; when (must_write_hi_file maybe_diffs)
101 (writeIface hi_file_path final_iface)
104 ; write_diffs dflags final_iface maybe_diffs
106 ; return final_iface }
109 must_write_hi_file Nothing = False
110 must_write_hi_file (Just diffs) = ghci_mode /= Interactive
111 -- We must write a new .hi file if there are some changes
112 -- and we're not in interactive mode
113 -- maybe_diffs = 'Nothing' means that even the usages havn't changed,
114 -- so there's no need to write a new interface file. But even if
115 -- the usages have changed, the module version may not have.
117 hi_file_path = ml_hi_file location
118 new_decls = mkIfaceDecls ty_cls_dcls rule_dcls inst_dcls
119 inst_dcls = map ifaceInstance (md_insts new_details)
120 ty_cls_dcls = foldNameEnv ifaceTyCls_acc [] (md_types new_details)
121 rule_dcls = map ifaceRule (md_rules new_details)
122 orphan_mod = isOrphanModule (mi_module new_iface) new_details
124 write_diffs dflags new_iface Nothing
125 = do when (dopt Opt_D_dump_hi_diffs dflags) (printDump (text "INTERFACE UNCHANGED"))
126 dumpIfSet_dyn dflags Opt_D_dump_hi "UNCHANGED FINAL INTERFACE" (pprIface new_iface)
128 write_diffs dflags new_iface (Just sdoc_diffs)
129 = do dumpIfSet_dyn dflags Opt_D_dump_hi_diffs "INTERFACE HAS CHANGED" sdoc_diffs
130 dumpIfSet_dyn dflags Opt_D_dump_hi "NEW FINAL INTERFACE" (pprIface new_iface)
134 isOrphanModule this_mod (ModDetails {md_insts = insts, md_rules = rules})
135 = any orphan_inst insts || any orphan_rule rules
137 orphan_inst dfun_id = no_locals (namesOfDFunHead (idType dfun_id))
138 orphan_rule rule = no_locals (ruleLhsFreeNames rule)
139 no_locals names = isEmptyNameSet (filterNameSet (nameIsLocalOrFrom this_mod) names)
142 Implicit Ids and class tycons aren't included in interface files, so
143 we miss them out of the accumulating parameter here.
146 ifaceTyCls_acc :: TyThing -> [RenamedTyClDecl] -> [RenamedTyClDecl]
147 ifaceTyCls_acc (AnId id) so_far | isImplicitId id = so_far
148 ifaceTyCls_acc (ATyCon id) so_far | isClassTyCon id = so_far
149 ifaceTyCls_acc other so_far = ifaceTyCls other : so_far
152 Convert *any* TyThing into a RenamedTyClDecl. Used both for
153 generating interface files and for the ':info' command in GHCi.
156 ifaceTyCls :: TyThing -> RenamedTyClDecl
157 ifaceTyCls (AClass clas) = cls_decl
159 cls_decl = ClassDecl { tcdCtxt = toHsContext sc_theta,
160 tcdName = getName clas,
161 tcdTyVars = toHsTyVars clas_tyvars,
162 tcdFDs = toHsFDs clas_fds,
163 tcdSigs = map toClassOpSig op_stuff,
165 tcdSysNames = sys_names,
168 (clas_tyvars, clas_fds, sc_theta, sc_sels, op_stuff) = classExtraBigSig clas
169 tycon = classTyCon clas
170 data_con = head (tyConDataCons tycon)
171 sys_names = mkClassDeclSysNames (getName tycon, getName data_con,
172 getName (dataConId data_con), map getName sc_sels)
174 toClassOpSig (sel_id, def_meth)
175 = ASSERT(sel_tyvars == clas_tyvars)
176 ClassOpSig (getName sel_id) def_meth' (toHsType op_ty) noSrcLoc
178 (sel_tyvars, _, op_ty) = tcSplitSigmaTy (idType sel_id)
179 def_meth' = case def_meth of
180 NoDefMeth -> NoDefMeth
181 GenDefMeth -> GenDefMeth
182 DefMeth id -> DefMeth (getName id)
184 ifaceTyCls (ATyCon tycon) = ty_decl
186 ty_decl | isSynTyCon tycon
187 = TySynonym { tcdName = getName tycon,
188 tcdTyVars = toHsTyVars tyvars,
189 tcdSynRhs = toHsType syn_ty,
193 = TyData { tcdND = new_or_data,
194 tcdCtxt = toHsContext (tyConTheta tycon),
195 tcdName = getName tycon,
196 tcdTyVars = toHsTyVars tyvars,
197 tcdCons = map ifaceConDecl (tyConDataCons tycon),
198 tcdNCons = tyConFamilySize tycon,
200 tcdSysNames = map getName (tyConGenIds tycon),
203 | isForeignTyCon tycon
204 = ForeignType { tcdName = getName tycon,
205 tcdFoType = DNType, -- The only case at present
209 -- needed in GHCi for ':info Int#', for example
210 = TyData { tcdND = DataType,
212 tcdName = getName tycon,
213 tcdTyVars = toHsTyVars (take (tyConArity tycon) alphaTyVars),
220 | otherwise = pprPanic "ifaceTyCls" (ppr tycon)
222 tyvars = tyConTyVars tycon
223 (_, syn_ty) = getSynTyConDefn tycon
224 new_or_data | isNewTyCon tycon = NewType
225 | otherwise = DataType
227 ifaceConDecl data_con
228 = ConDecl (getName data_con) (getName (dataConId data_con))
229 (toHsTyVars ex_tyvars)
230 (toHsContext ex_theta)
233 (tyvars1, _, ex_tyvars, ex_theta, arg_tys, tycon1) = dataConSig data_con
234 field_labels = dataConFieldLabels data_con
235 strict_marks = drop (length ex_theta) (dataConStrictMarks data_con)
236 -- The 'drop' is because dataConStrictMarks
237 -- includes the existential dictionaries
238 details | null field_labels
239 = ASSERT( tycon == tycon1 && tyvars == tyvars1 )
240 VanillaCon (zipWith BangType strict_marks (map toHsType arg_tys))
243 = RecCon (zipWith mk_field strict_marks field_labels)
245 mk_field strict_mark field_label
246 = ([getName field_label], BangType strict_mark (toHsType (fieldLabelType field_label)))
248 ifaceTyCls (AnId id) = iface_sig
250 iface_sig = IfaceSig { tcdName = getName id,
251 tcdType = toHsType id_type,
252 tcdIdInfo = hs_idinfo,
257 cg_info = idCgInfo id
258 arity_info = cgArity cg_info
259 caf_info = cgCafInfo cg_info
261 hs_idinfo | opt_OmitInterfacePragmas = []
262 | otherwise = arity_hsinfo ++ caf_hsinfo ++
263 strict_hsinfo ++ wrkr_hsinfo ++ unfold_hsinfo
265 ------------ Arity --------------
266 arity_hsinfo | arity_info == 0 = []
267 | otherwise = [HsArity arity_info]
269 ------------ Caf Info --------------
270 caf_hsinfo = case caf_info of
271 NoCafRefs -> [HsNoCafRefs]
274 ------------ Strictness --------------
275 strict_hsinfo = case newStrictnessInfo id_info of
277 Just sig -> [HsStrictness sig]
279 ------------ Worker --------------
280 work_info = workerInfo id_info
281 has_worker = case work_info of { HasWorker _ _ -> True; other -> False }
282 wrkr_hsinfo = case work_info of
283 HasWorker work_id wrap_arity ->
284 [HsWorker (getName work_id) wrap_arity]
287 ------------ Unfolding --------------
288 -- The unfolding is redundant if there is a worker
289 unfold_info = unfoldingInfo id_info
290 inline_prag = inlinePragInfo id_info
291 rhs = unfoldingTemplate unfold_info
292 unfold_hsinfo | neverUnfold unfold_info
294 | otherwise = [HsUnfold inline_prag (toUfExpr rhs)]
298 ifaceInstance :: DFunId -> RenamedInstDecl
299 ifaceInstance dfun_id
300 = InstDecl (toHsType tidy_ty) EmptyMonoBinds [] (Just (getName dfun_id)) noSrcLoc
302 tidy_ty = tidyTopType (deNoteType (idType dfun_id))
303 -- The deNoteType is very important. It removes all type
304 -- synonyms from the instance type in interface files.
305 -- That in turn makes sure that when reading in instance decls
306 -- from interface files that the 'gating' mechanism works properly.
307 -- Otherwise you could have
308 -- type Tibble = T Int
309 -- instance Foo Tibble where ...
310 -- and this instance decl wouldn't get imported into a module
311 -- that mentioned T but not Tibble.
313 ifaceRule (id, BuiltinRule _ _)
314 = pprTrace "toHsRule: builtin" (ppr id) (bogusIfaceRule id)
316 ifaceRule (id, Rule name bndrs args rhs)
317 = IfaceRule name (map toUfBndr bndrs) (getName id)
318 (map toUfExpr args) (toUfExpr rhs) noSrcLoc
321 = IfaceRule SLIT("bogus") [] (getName id) [] (UfVar (getName id)) noSrcLoc
325 %************************************************************************
327 \subsection{Checking if the new interface is up to date
329 %************************************************************************
332 addVersionInfo :: Maybe ModIface -- The old interface, read from M.hi
333 -> ModIface -- The new interface decls
334 -> (ModIface, Maybe SDoc) -- Nothing => no change; no need to write new Iface
335 -- Just mi => Here is the new interface to write
336 -- with correct version numbers
338 -- NB: the fixities, declarations, rules are all assumed
339 -- to be sorted by increasing order of hsDeclName, so that
340 -- we can compare for equality
342 addVersionInfo Nothing new_iface
343 -- No old interface, so definitely write a new one!
344 = (new_iface, Just (text "No old interface available"))
346 addVersionInfo (Just old_iface@(ModIface { mi_version = old_version,
347 mi_decls = old_decls,
348 mi_fixities = old_fixities,
349 mi_deprecs = old_deprecs }))
350 new_iface@(ModIface { mi_decls = new_decls,
351 mi_fixities = new_fixities,
352 mi_deprecs = new_deprecs })
354 | no_output_change && no_usage_change
355 = (new_iface, Nothing)
356 -- don't return the old iface because it may not have an
357 -- mi_globals field set to anything reasonable.
359 | otherwise -- Add updated version numbers
360 = --pprTrace "completeIface" (ppr (dcl_tycl old_decls))
361 (final_iface, Just pp_diffs)
364 final_iface = new_iface { mi_version = new_version }
365 old_mod_vers = vers_module old_version
366 new_version = VersionInfo { vers_module = bumpVersion no_output_change old_mod_vers,
367 vers_exports = bumpVersion no_export_change (vers_exports old_version),
368 vers_rules = bumpVersion no_rule_change (vers_rules old_version),
369 vers_decls = tc_vers }
371 no_output_change = no_tc_change && no_rule_change && no_export_change && no_deprec_change
372 no_usage_change = mi_usages old_iface == mi_usages new_iface
374 no_export_change = mi_exports old_iface == mi_exports new_iface -- Kept sorted
375 no_rule_change = dcl_rules old_decls == dcl_rules new_decls -- Ditto
376 no_deprec_change = old_deprecs == new_deprecs
378 -- Fill in the version number on the new declarations by looking at the old declarations.
379 -- Set the flag if anything changes.
380 -- Assumes that the decls are sorted by hsDeclName.
381 (no_tc_change, pp_tc_diffs, tc_vers) = diffDecls old_version old_fixities new_fixities
382 (dcl_tycl old_decls) (dcl_tycl new_decls)
383 pp_diffs = vcat [pp_tc_diffs,
384 pp_change no_export_change "Export list",
385 pp_change no_rule_change "Rules",
386 pp_change no_deprec_change "Deprecations",
387 pp_change no_usage_change "Usages"]
388 pp_change True what = empty
389 pp_change False what = text what <+> ptext SLIT("changed")
391 diffDecls :: VersionInfo -- Old version
392 -> NameEnv Fixity -> NameEnv Fixity -- Old and new fixities
393 -> [RenamedTyClDecl] -> [RenamedTyClDecl] -- Old and new decls
394 -> (Bool, -- True <=> no change
395 SDoc, -- Record of differences
396 NameEnv Version) -- New version map
398 diffDecls (VersionInfo { vers_module = old_mod_vers, vers_decls = old_decls_vers })
399 old_fixities new_fixities old new
400 = diff True empty emptyNameEnv old new
402 -- When seeing if two decls are the same,
403 -- remember to check whether any relevant fixity has changed
404 eq_tc d1 d2 = d1 == d2 && all (same_fixity . fst) (tyClDeclNames d1)
405 same_fixity n = lookupNameEnv old_fixities n == lookupNameEnv new_fixities n
407 diff ok_so_far pp new_vers [] [] = (ok_so_far, pp, new_vers)
408 diff ok_so_far pp new_vers (od:ods) [] = diff False (pp $$ only_old od) new_vers ods []
409 diff ok_so_far pp new_vers [] (nd:nds) = diff False (pp $$ only_new nd) new_vers_with_new [] nds
411 new_vers_with_new = extendNameEnv new_vers (tyClDeclName nd) (bumpVersion False old_mod_vers)
412 -- When adding a new item, start from the old module version
413 -- This way, if you have version 4 of f, then delete f, then add f again,
414 -- you'll get version 6 of f, which will (correctly) force recompilation of
417 diff ok_so_far pp new_vers (od:ods) (nd:nds)
418 = case od_name `compare` nd_name of
419 LT -> diff False (pp $$ only_old od) new_vers ods (nd:nds)
420 GT -> diff False (pp $$ only_new nd) new_vers (od:ods) nds
421 EQ | od `eq_tc` nd -> diff ok_so_far pp new_vers ods nds
422 | otherwise -> diff False (pp $$ changed od nd) new_vers_with_diff ods nds
424 od_name = tyClDeclName od
425 nd_name = tyClDeclName nd
426 new_vers_with_diff = extendNameEnv new_vers nd_name (bumpVersion False old_version)
427 old_version = lookupVersion old_decls_vers od_name
429 only_old d = ptext SLIT("Only in old iface:") <+> ppr d
430 only_new d = ptext SLIT("Only in new iface:") <+> ppr d
431 changed od nd = ptext SLIT("Changed in iface: ") <+> ((ptext SLIT("Old:") <+> ppr od) $$
432 (ptext SLIT("New:") <+> ppr nd))
437 %************************************************************************
439 \subsection{Writing ModDetails}
441 %************************************************************************
444 pprModDetails :: ModDetails -> SDoc
445 pprModDetails (ModDetails { md_types = type_env, md_insts = dfun_ids, md_rules = rules })
446 = vcat [ dump_types dfun_ids type_env
447 , dump_insts dfun_ids
450 dump_types dfun_ids type_env
451 = text "TYPE SIGNATURES" $$ nest 4 (dump_sigs ids)
453 ids = [id | AnId id <- nameEnvElts type_env, want_sig id]
454 want_sig id | opt_PprStyle_Debug = True
455 | otherwise = isLocalId id &&
456 isGlobalName (idName id) &&
457 not (id `elem` dfun_ids)
458 -- isLocalId ignores data constructors, records selectors etc
459 -- The isGlobalName ignores local dictionary and method bindings
460 -- that the type checker has invented. User-defined things have
463 dump_insts [] = empty
464 dump_insts dfun_ids = text "INSTANCES" $$ nest 4 (dump_sigs dfun_ids)
467 -- Print type signatures
468 -- Convert to HsType so that we get source-language style printing
469 -- And sort by RdrName
470 = vcat $ map ppr_sig $ sortLt lt_sig $
471 [ (toRdrName id, toHsType (idType id))
474 lt_sig (n1,_) (n2,_) = n1 < n2
475 ppr_sig (n,t) = ppr n <+> dcolon <+> ppr t
477 dump_rules [] = empty
478 dump_rules rs = vcat [ptext SLIT("{-# RULES"),
479 nest 4 (vcat (map pprIdCoreRule rs)),
484 %************************************************************************
486 \subsection{Writing an interface file}
488 %************************************************************************
491 writeIface :: FilePath -> ModIface -> IO ()
492 writeIface hi_path mod_iface
493 = do { if_hdl <- openFile hi_path WriteMode
494 ; printForIface if_hdl from_this_mod (pprIface mod_iface)
498 -- Print names unqualified if they are from this module
499 from_this_mod n = nameModule n == this_mod
500 this_mod = mi_module mod_iface
502 pprIface :: ModIface -> SDoc
504 = vcat [ ptext SLIT("__interface")
505 <+> doubleQuotes (ptext opt_InPackage)
506 <+> ppr (mi_module iface) <+> ppr (vers_module version_info)
508 <+> (if mi_orphan iface then char '!' else empty)
509 <+> int opt_HiVersion
510 <+> ptext SLIT("where")
512 , vcat (map pprExport (mi_exports iface))
513 , vcat (map pprUsage (mi_usages iface))
515 , pprFixities (mi_fixities iface) (dcl_tycl decls)
516 , pprIfaceDecls (vers_decls version_info) decls
517 , pprRulesAndDeprecs (dcl_rules decls) (mi_deprecs iface)
520 version_info = mi_version iface
521 decls = mi_decls iface
522 exp_vers = vers_exports version_info
523 rule_vers = vers_rules version_info
525 pp_sub_vers | exp_vers == initialVersion && rule_vers == initialVersion = empty
526 | otherwise = brackets (ppr exp_vers <+> ppr rule_vers)
529 When printing export lists, we print like this:
531 AvailTC C [C, x, y] C(x,y)
532 AvailTC C [x, y] C!(x,y) -- Exporting x, y but not C
535 pprExport :: (ModuleName, Avails) -> SDoc
536 pprExport (mod, items)
537 = hsep [ ptext SLIT("__export "), ppr mod, hsep (map pp_avail items) ] <> semi
539 pp_avail :: AvailInfo -> SDoc
540 pp_avail (Avail name) = pprOcc name
541 pp_avail (AvailTC n []) = empty
542 pp_avail (AvailTC n (n':ns)) | n==n' = pprOcc n <> pp_export ns
543 | otherwise = pprOcc n <> char '|' <> pp_export (n':ns)
546 pp_export names = braces (hsep (map pprOcc names))
548 pprOcc :: Name -> SDoc -- Print the occurrence name only
549 pprOcc n = pprOccName (nameOccName n)
554 pprUsage :: ImportVersion Name -> SDoc
555 pprUsage (m, has_orphans, is_boot, whats_imported)
556 = hsep [ptext SLIT("import"), ppr m,
558 pp_versions whats_imported
561 pp_orphan | has_orphans = char '!'
563 pp_boot | is_boot = char '@'
566 -- Importing the whole module is indicated by an empty list
567 pp_versions NothingAtAll = empty
568 pp_versions (Everything v) = dcolon <+> int v
569 pp_versions (Specifically vm ve nvs vr) = dcolon <+> int vm <+> pp_export_version ve <+> int vr
570 <+> hsep [ pprOcc n <+> int v | (n,v) <- nvs ]
572 pp_export_version Nothing = empty
573 pp_export_version (Just v) = int v
577 pprIfaceDecls version_map decls
578 = vcat [ vcat [ppr i <+> semi | i <- dcl_insts decls]
579 , vcat (map ppr_decl (dcl_tycl decls))
582 ppr_decl d = ppr_vers d <+> ppr d <> semi
584 -- Print the version for the decl
585 ppr_vers d = case lookupNameEnv version_map (tyClDeclName d) of
591 pprFixities fixity_map decls
592 = hsep [ ppr fix <+> ppr n
594 (n,_) <- tyClDeclNames d,
595 Just fix <- [lookupNameEnv fixity_map n]] <> semi
597 -- Disgusting to print these two together, but that's
598 -- the way the interface parser currently expects them.
599 pprRulesAndDeprecs [] NoDeprecs = empty
600 pprRulesAndDeprecs rules deprecs
601 = ptext SLIT("{-##") <+> (pp_rules rules $$ pp_deprecs deprecs) <+> ptext SLIT("##-}")
604 pp_rules rules = ptext SLIT("__R") <+> vcat (map ppr rules)
606 pp_deprecs NoDeprecs = empty
607 pp_deprecs deprecs = ptext SLIT("__D") <+> guts
609 guts = case deprecs of
610 DeprecAll txt -> doubleQuotes (ptext txt)
611 DeprecSome env -> ppr_deprec_env env
613 ppr_deprec_env env = vcat (punctuate semi (map pp_deprec (nameEnvElts env)))
615 pp_deprec (name, txt) = pprOcc name <+> doubleQuotes (ptext txt)