2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section{Dealing with interface files}
8 readIface, loadInterface, loadHomeInterface,
14 #include "HsVersions.h"
16 import DriverState ( v_GhcMode, isCompManagerMode )
17 import DriverUtil ( splitFilename, replaceFilenameSuffix )
18 import CmdLineOpts ( opt_IgnoreIfacePragmas )
19 import Parser ( parseIface )
20 import HscTypes ( ModIface(..), emptyModIface,
21 ExternalPackageState(..), noDependencies,
22 VersionInfo(..), Usage(..),
23 lookupIfaceByModName, RdrExportItem,
25 DeclsMap, GatedDecl, IfaceInsts, IfaceRules, mkIfaceDecls,
26 AvailInfo, GenAvailInfo(..), ParsedIface(..), IfaceDeprecs,
27 Avails, availNames, availName, Deprecations(..)
29 import HsSyn ( TyClDecl(..), InstDecl(..), RuleDecl(..), ConDecl(..),
30 hsTyVarNames, splitHsInstDeclTy, tyClDeclName, tyClDeclNames
32 import RdrHsSyn ( RdrNameTyClDecl, RdrNameInstDecl, RdrNameRuleDecl )
33 import RnHsSyn ( RenamedInstDecl, RenamedRuleDecl, RenamedTyClDecl,
35 import BasicTypes ( Version, FixitySig(..), Fixity(..), FixityDirection(..) )
36 import RnSource ( rnIfaceRuleDecl, rnTyClDecl, rnInstDecl )
37 import RnTypes ( rnHsType )
41 import PrelNames ( gHC_PRIM_Name, gHC_PRIM )
42 import PrelInfo ( ghcPrimExports, cCallableClassDecl, cReturnableClassDecl )
43 import Name ( Name {-instance NamedThing-},
44 nameModule, isInternalName )
49 import Packages ( basePackage )
50 import Module ( Module, ModuleName, ModLocation(ml_hi_file),
51 moduleName, isHomeModule, mkPackageModule,
52 extendModuleEnv, lookupModuleEnvByName
54 import RdrName ( RdrName, mkRdrUnqual, rdrNameOcc, nameRdrName )
55 import OccName ( OccName, mkWorkerOcc, mkClassTyConOcc, mkClassDataConOcc,
56 mkSuperDictSelOcc, mkGenOcc1, mkGenOcc2 )
57 import TyCon ( DataConDetails(..) )
58 import SrcLoc ( noSrcLoc, mkSrcLoc )
59 import Maybes ( maybeToBool )
60 import StringBuffer ( hGetStringBuffer )
61 import FastString ( mkFastString )
62 import ErrUtils ( Message )
63 import Finder ( findModule, findPackageModule,
64 hiBootExt, hiBootVerExt )
67 import ListSetOps ( minusList )
70 import BinIface ( readBinIface )
74 import EXCEPTION as Exception
75 import DATA_IOREF ( readIORef )
81 %*********************************************************
83 \subsection{Loading a new interface file}
85 %*********************************************************
88 loadHomeInterface :: SDoc -> Name -> TcRn m ModIface
89 loadHomeInterface doc_str name
90 = ASSERT2( not (isInternalName name), ppr name <+> parens doc_str )
91 loadInterface doc_str (moduleName (nameModule name)) ImportBySystem
93 loadOrphanModules :: [ModuleName] -> TcRn m ()
94 loadOrphanModules mods
95 | null mods = returnM ()
96 | otherwise = traceRn (text "Loading orphan modules:" <+>
97 fsep (map ppr mods)) `thenM_`
98 mappM_ load mods `thenM_`
101 load mod = loadInterface (mk_doc mod) mod ImportBySystem
102 mk_doc mod = ppr mod <+> ptext SLIT("is a orphan-instance module")
104 loadInterface :: SDoc -> ModuleName -> WhereFrom -> TcRn m ModIface
105 -- Returns Nothing if failed
106 -- If we can't find an interface file, and we are doing ImportForUsage,
107 -- just fail in the monad, and modify anything else
108 -- Otherwise, if we can't find an interface file,
109 -- add an error message to the monad (the first time only)
110 -- and return emptyIface
111 -- The "first time only" part is done by modifying the PackageIfaceTable
112 -- to have an empty entry
114 -- The ImportForUsage case is because when we read the usage information from
115 -- an interface file, we try to read the interfaces it mentions.
116 -- But it's OK to fail; perhaps the module has changed, and that interface
117 -- is no longer used.
119 loadInterface doc_str mod_name from
120 = getHpt `thenM` \ hpt ->
121 getModule `thenM` \ this_mod ->
122 getImports `thenM` \ import_avails ->
123 getEps `thenM` \ eps@(EPS { eps_PIT = pit }) ->
125 -- CHECK WHETHER WE HAVE IT ALREADY
126 case lookupIfaceByModName hpt pit mod_name of {
127 Just iface | case from of
128 ImportByUser src_imp -> src_imp == mi_boot iface
129 ImportForUsage src_imp -> src_imp == mi_boot iface
130 ImportBySystem -> True
131 -> returnM iface ; -- Already loaded
132 -- The not (mi_boot iface) test checks that the already-loaded
133 -- interface isn't a boot iface. This can conceivably happen,
134 -- if the version checking happened to load a boot interface
135 -- before we got to real imports.
139 mod_map = imp_dep_mods import_avails
140 mod_info = lookupModuleEnvByName mod_map mod_name
143 = case (from, mod_info) of
144 (ImportByUser is_boot, _) -> is_boot
145 (ImportForUsage is_boot, _) -> is_boot
146 (ImportBySystem, Just (_, is_boot)) -> is_boot
147 (ImportBySystem, Nothing) -> False
148 -- We're importing a module we know absolutely
149 -- nothing about, so we assume it's from
150 -- another package, where we aren't doing
151 -- dependency tracking. So it won't be a hi-boot file.
153 redundant_source_import
154 = case (from, mod_info) of
155 (ImportByUser True, Just (_, False)) -> True
159 -- Issue a warning for a redundant {- SOURCE -} import
160 -- NB that we arrange to read all the ordinary imports before
161 -- any of the {- SOURCE -} imports
162 warnIf redundant_source_import
163 (warnRedundantSourceImport mod_name) `thenM_`
165 -- Check that we aren't importing ourselves.
166 -- That only happens in Rename.checkOldIface,
167 -- which doesn't call loadInterface
169 (isHomeModule this_mod && moduleName this_mod == mod_name)
170 (warnSelfImport this_mod) `thenM_`
172 -- READ THE MODULE IN
173 findAndReadIface doc_str mod_name hi_boot_file
174 `thenM` \ read_result ->
175 case read_result of {
177 | case from of { ImportForUsage _ -> True ; other -> False }
178 -> failM -- Fail with no error messages
181 -> let -- Not found, so add an empty export env to
182 -- the EPS map so that we don't look again
183 fake_mod = mkPackageModule mod_name
184 fake_iface = emptyModIface fake_mod
185 new_eps = eps { eps_PIT = extendModuleEnv pit fake_mod fake_iface }
187 setEps new_eps `thenM_`
188 addErr (elaborate err) `thenM_`
191 elaborate err = hang (ptext SLIT("Failed to load interface for") <+>
192 quotes (ppr mod_name) <> colon) 4 err
196 Right (mod, iface) ->
200 -- NB: *first* we do loadDecl, so that the provenance of all the locally-defined
201 --- names is done correctly (notably, whether this is an .hi file or .hi-boot file).
202 -- If we do loadExport first the wrong info gets into the cache (unless we
203 -- explicitly tag each export which seems a bit of a bore)
206 -- Sanity check. If we're system-importing a module we know nothing at all
207 -- about, it should be from a different package to this one
208 WARN( not (maybeToBool mod_info) &&
209 case from of { ImportBySystem -> True; other -> False } &&
213 initRn (InterfaceMode mod) $
214 -- Set the module, for use when looking up occurrences
215 -- of names in interface decls and rules
216 loadDecls mod (eps_decls eps) (pi_decls iface) `thenM` \ (decls_vers, new_decls) ->
217 loadRules mod (eps_rules eps) (pi_rules iface) `thenM` \ (rule_vers, new_rules) ->
218 loadInstDecls mod (eps_insts eps) (pi_insts iface) `thenM` \ new_insts ->
219 loadExports (pi_exports iface) `thenM` \ (export_vers, avails) ->
220 loadFixDecls (pi_fixity iface) `thenM` \ fix_env ->
221 loadDeprecs (pi_deprecs iface) `thenM` \ deprec_env ->
223 version = VersionInfo { vers_module = pi_vers iface,
224 vers_exports = export_vers,
225 vers_rules = rule_vers,
226 vers_decls = decls_vers }
228 this_mod_name = moduleName this_mod
229 is_loaded m = m == this_mod_name
230 || maybeToBool (lookupIfaceByModName hpt pit m)
231 -- We treat the currently-being-compiled module as 'loaded' because
232 -- even though it isn't yet in the HIT or PIT; otherwise it gets
233 -- put into iImpModInfo, and then spat out into its own interface
234 -- file as a dependency
236 -- Now add info about this module to the PIT
237 has_orphans = pi_orphan iface
238 new_pit = extendModuleEnv pit mod mod_iface
239 mod_iface = ModIface { mi_module = mod, mi_package = pi_pkg iface,
240 mi_version = version,
241 mi_orphan = has_orphans, mi_boot = hi_boot_file,
243 mi_fixities = fix_env, mi_deprecs = deprec_env,
244 mi_deps = pi_deps iface,
245 mi_usages = panic "No mi_usages in PIT",
246 mi_decls = panic "No mi_decls in PIT",
250 new_eps = eps { eps_PIT = new_pit,
251 eps_decls = new_decls,
252 eps_insts = new_insts,
253 eps_rules = new_rules }
255 setEps new_eps `thenM_`
259 -----------------------------------------------------
260 -- Loading the export list
261 -----------------------------------------------------
263 loadExports :: (Version, [RdrExportItem]) -> TcRn m (Version, [(ModuleName,Avails)])
264 loadExports (vers, items)
265 = mappM loadExport items `thenM` \ avails_s ->
266 returnM (vers, avails_s)
269 loadExport :: RdrExportItem -> TcRn m (ModuleName, Avails)
270 loadExport (mod, entities)
271 = mappM (load_entity mod) entities `thenM` \ avails ->
272 returnM (mod, avails)
274 load_entity mod (Avail occ)
275 = newGlobalName2 mod occ `thenM` \ name ->
277 load_entity mod (AvailTC occ occs)
278 = newGlobalName2 mod occ `thenM` \ name ->
279 mappM (newGlobalName2 mod) occs `thenM` \ names ->
280 returnM (AvailTC name names)
283 -----------------------------------------------------
284 -- Loading type/class/value decls
285 -----------------------------------------------------
289 -> [(Version, RdrNameTyClDecl)]
290 -> TcRn m (NameEnv Version, DeclsMap)
291 loadDecls mod (decls_map, n_slurped) decls
292 = foldlM (loadDecl mod) (emptyNameEnv, decls_map) decls `thenM` \ (vers, decls_map') ->
293 returnM (vers, (decls_map', n_slurped))
295 loadDecl mod (version_map, decls_map) (version, decl)
296 = getTyClDeclBinders mod decl `thenM` \ avail ->
297 getSysBinders mod decl `thenM` \ sys_names ->
299 full_avail = case avail of
301 AvailTC n ns -> AvailTC n (sys_names ++ ns)
302 main_name = availName full_avail
303 new_decls_map = extendNameEnvList decls_map stuff
304 stuff = [ (name, (full_avail, name==main_name, (mod, decl)))
305 | name <- availNames full_avail]
307 new_version_map = extendNameEnv version_map main_name version
309 traceRn (text "Loading" <+> ppr full_avail) `thenM_`
310 returnM (new_version_map, new_decls_map)
315 getTyClDeclBinders :: Module -> RdrNameTyClDecl -> TcRn m AvailInfo
317 getTyClDeclBinders mod (IfaceSig {tcdName = var, tcdLoc = src_loc})
318 = newTopBinder mod var src_loc `thenM` \ var_name ->
319 returnM (Avail var_name)
321 getTyClDeclBinders mod tycl_decl
322 = mapM new (tyClDeclNames tycl_decl) `thenM` \ names@(main_name:_) ->
323 returnM (AvailTC main_name names)
325 new (nm,loc) = newTopBinder mod nm loc
327 --------------------------------
328 -- The "system names" are extra implicit names *bound* by the decl.
330 getSysBinders :: Module -> TyClDecl RdrName -> TcRn m [Name]
331 -- Similar to tyClDeclNames, but returns the "implicit"
332 -- or "system" names of the declaration. And it only works
333 -- on RdrNames, returning OccNames
335 getSysBinders mod (ClassDecl {tcdName = cname, tcdCtxt = cxt, tcdLoc = loc})
336 = sequenceM [new_sys_bndr mod n loc | n <- sys_occs]
338 -- C.f. TcClassDcl.tcClassDecl1
339 sys_occs = tc_occ : data_occ : dw_occ : sc_sel_occs
340 cls_occ = rdrNameOcc cname
341 data_occ = mkClassDataConOcc cls_occ
342 dw_occ = mkWorkerOcc data_occ
343 tc_occ = mkClassTyConOcc cls_occ
344 sc_sel_occs = [mkSuperDictSelOcc n cls_occ | n <- [1..length cxt]]
346 getSysBinders mod (TyData {tcdName = tc_name, tcdCons = DataCons cons,
347 tcdGeneric = Just want_generic, tcdLoc = loc})
348 -- The 'Just' is because this is an interface-file decl
349 -- so it will say whether to derive generic stuff for it or not
350 = sequenceM ([new_sys_bndr mod n loc | n <- gen_occs] ++
351 map con_sys_occ cons)
353 -- c.f. TcTyDecls.tcTyDecl
354 tc_occ = rdrNameOcc tc_name
355 gen_occs | want_generic = [mkGenOcc1 tc_occ, mkGenOcc2 tc_occ]
357 con_sys_occ (ConDecl name _ _ _ loc)
358 = new_sys_bndr mod (mkWorkerOcc (rdrNameOcc name)) loc
360 getSysBinders mod decl = returnM []
362 new_sys_bndr mod occ loc = newTopBinder mod (mkRdrUnqual occ) loc
365 -----------------------------------------------------
366 -- Loading fixity decls
367 -----------------------------------------------------
370 = mappM loadFixDecl decls `thenM` \ to_add ->
371 returnM (mkNameEnv to_add)
373 loadFixDecl (FixitySig rdr_name fixity loc)
374 = lookupGlobalOccRn rdr_name `thenM` \ name ->
375 returnM (name, FixitySig name fixity loc)
378 -----------------------------------------------------
379 -- Loading instance decls
380 -----------------------------------------------------
382 loadInstDecls :: Module -> IfaceInsts
385 loadInstDecls mod (insts, n_slurped) decls
386 = foldlM (loadInstDecl mod) insts decls `thenM` \ insts' ->
387 returnM (insts', n_slurped)
390 loadInstDecl mod insts decl@(InstDecl inst_ty _ _ _ _)
391 = -- Find out what type constructors and classes are "gates" for the
392 -- instance declaration. If all these "gates" are slurped in then
393 -- we should slurp the instance decl too.
395 -- We *don't* want to count names in the context part as gates, though.
397 -- instance Foo a => Baz (T a) where ...
399 -- Here the gates are Baz and T, but *not* Foo.
401 -- HOWEVER: functional dependencies make things more complicated
402 -- class C a b | a->b where ...
403 -- instance C Foo Baz where ...
404 -- Here, the gates are really only C and Foo, *not* Baz.
405 -- That is, if C and Foo are visible, even if Baz isn't, we must
408 -- Rather than take fundeps into account "properly", we just slurp
409 -- if C is visible and *any one* of the Names in the types
410 -- This is a slightly brutal approximation, but most instance decls
411 -- are regular H98 ones and it's perfect for them.
413 -- NOTICE that we rename the type before extracting its free
414 -- variables. The free-variable finder for a renamed HsType
415 -- does the Right Thing for built-in syntax like [] and (,).
416 rnHsType (text "In an interface instance decl") inst_ty `thenM` \ inst_ty' ->
418 (tvs,_,cls,tys) = splitHsInstDeclTy inst_ty'
419 free_tcs = nameSetToList (extractHsTyNames_s tys) `minusList` hsTyVarNames tvs
421 gate_fn vis_fn = vis_fn cls && (null free_tcs || any vis_fn free_tcs)
422 -- The 'vis_fn' returns True for visible names
423 -- Here is the implementation of HOWEVER above
424 -- (Note that we do let the inst decl in if it mentions
425 -- no tycons at all. Hence the null free_ty_names.)
427 traceRn ((text "Load instance for" <+> ppr inst_ty') $$ ppr free_tcs) `thenM_`
428 returnM ((gate_fn, (mod, decl)) `consBag` insts)
432 -----------------------------------------------------
434 -----------------------------------------------------
438 -> (Version, [RdrNameRuleDecl])
439 -> RnM (Version, IfaceRules)
440 loadRules mod (rule_bag, n_slurped) (version, rules)
441 | null rules || opt_IgnoreIfacePragmas
442 = returnM (version, (rule_bag, n_slurped))
444 = mappM (loadRule mod) rules `thenM` \ new_rules ->
445 returnM (version, (rule_bag `unionBags` listToBag new_rules, n_slurped))
447 loadRule :: Module -> RdrNameRuleDecl -> RnM (GatedDecl RdrNameRuleDecl)
448 -- "Gate" the rule simply by whether the rule variable is
449 -- needed. We can refine this later.
450 loadRule mod decl@(IfaceRule _ _ _ var _ _ src_loc)
451 = lookupGlobalOccRn var `thenM` \ var_name ->
452 returnM (\vis_fn -> vis_fn var_name, (mod, decl))
455 -----------------------------------------------------
456 -- Loading Deprecations
457 -----------------------------------------------------
459 loadDeprecs :: IfaceDeprecs -> RnM Deprecations
460 loadDeprecs Nothing = returnM NoDeprecs
461 loadDeprecs (Just (Left txt)) = returnM (DeprecAll txt)
462 loadDeprecs (Just (Right prs)) = foldlM loadDeprec emptyNameEnv prs `thenM` \ env ->
463 returnM (DeprecSome env)
464 loadDeprec deprec_env (n, txt)
465 = lookupGlobalOccRn n `thenM` \ name ->
466 traceRn (text "Loaded deprecation(s) for" <+> ppr name <> colon <+> ppr txt) `thenM_`
467 returnM (extendNameEnv deprec_env name (name,txt))
471 %********************************************************
473 Load the ParsedIface for the *current* module
474 into a ModIface; then it can be checked
477 %********************************************************
480 loadOldIface :: ParsedIface -> RnM ModIface
483 = loadHomeDecls (pi_decls iface) `thenM` \ (decls_vers, new_decls) ->
484 loadHomeRules (pi_rules iface) `thenM` \ (rule_vers, new_rules) ->
485 loadHomeInsts (pi_insts iface) `thenM` \ new_insts ->
486 mappM loadHomeUsage (pi_usages iface) `thenM` \ usages ->
487 loadExports (pi_exports iface) `thenM` \ (export_vers, avails) ->
488 loadFixDecls (pi_fixity iface) `thenM` \ fix_env ->
489 loadDeprecs (pi_deprecs iface) `thenM` \ deprec_env ->
491 getModeRn `thenM` \ (InterfaceMode mod) ->
492 -- Caller sets the module before the call; also needed
493 -- by the newGlobalName stuff in some of the loadHomeX calls
495 version = VersionInfo { vers_module = pi_vers iface,
496 vers_exports = export_vers,
497 vers_rules = rule_vers,
498 vers_decls = decls_vers }
500 decls = mkIfaceDecls new_decls new_rules new_insts
502 mod_iface = ModIface { mi_module = mod, mi_package = pi_pkg iface,
503 mi_version = version, mi_deps = pi_deps iface,
504 mi_exports = avails, mi_usages = usages,
505 mi_boot = False, mi_orphan = pi_orphan iface,
506 mi_fixities = fix_env, mi_deprecs = deprec_env,
515 loadHomeDecls :: [(Version, RdrNameTyClDecl)]
516 -> RnM (NameEnv Version, [RenamedTyClDecl])
517 loadHomeDecls decls = foldlM loadHomeDecl (emptyNameEnv, []) decls
519 loadHomeDecl :: (NameEnv Version, [RenamedTyClDecl])
520 -> (Version, RdrNameTyClDecl)
521 -> RnM (NameEnv Version, [RenamedTyClDecl])
522 loadHomeDecl (version_map, decls) (version, decl)
523 = rnTyClDecl decl `thenM` \ decl' ->
524 returnM (extendNameEnv version_map (tyClDeclName decl') version, decl':decls)
527 loadHomeRules :: (Version, [RdrNameRuleDecl])
528 -> RnM (Version, [RenamedRuleDecl])
529 loadHomeRules (version, rules)
530 = mappM rnIfaceRuleDecl rules `thenM` \ rules' ->
531 returnM (version, rules')
534 loadHomeInsts :: [RdrNameInstDecl]
535 -> RnM [RenamedInstDecl]
536 loadHomeInsts insts = mappM rnInstDecl insts
539 loadHomeUsage :: Usage OccName -> TcRn m (Usage Name)
541 = mappM rn_imp (usg_entities usage) `thenM` \ entities' ->
542 returnM (usage { usg_entities = entities' })
544 mod_name = usg_name usage
545 rn_imp (occ,vers) = newGlobalName2 mod_name occ `thenM` \ name ->
550 %*********************************************************
552 \subsection{Reading an interface file}
554 %*********************************************************
557 findAndReadIface :: SDoc -> ModuleName
558 -> IsBootInterface -- True <=> Look for a .hi-boot file
559 -- False <=> Look for .hi file
560 -> TcRn m (Either Message (Module, ParsedIface))
561 -- Nothing <=> file not found, or unreadable, or illegible
562 -- Just x <=> successfully found and parsed
564 -- It *doesn't* add an error to the monad, because
565 -- sometimes it's ok to fail... see notes with loadInterface
567 findAndReadIface doc_str mod_name hi_boot_file
568 = traceRn trace_msg `thenM_`
570 -- Check for GHC.Prim, and return its static interface
571 if mod_name == gHC_PRIM_Name
572 then returnM (Right (gHC_PRIM, ghcPrimIface))
575 ioToTcRn (findHiFile mod_name hi_boot_file) `thenM` \ maybe_found ->
579 traceRn (ptext SLIT("...not found")) `thenM_`
580 returnM (Left (noIfaceErr mod_name hi_boot_file))
582 Just (wanted_mod, file_path) ->
583 traceRn (ptext SLIT("readIFace") <+> text file_path) `thenM_`
585 readIface wanted_mod file_path hi_boot_file `thenM` \ read_result ->
586 -- Catch exceptions here
589 Left exn -> returnM (Left (badIfaceFile file_path
590 (text (showException exn))))
592 Right iface -> returnM (Right (wanted_mod, iface))
595 trace_msg = sep [hsep [ptext SLIT("Reading"),
596 if hi_boot_file then ptext SLIT("[boot]") else empty,
597 ptext SLIT("interface for"),
598 ppr mod_name <> semi],
599 nest 4 (ptext SLIT("reason:") <+> doc_str)]
601 findHiFile :: ModuleName -> IsBootInterface -> IO (Maybe (Module, FilePath))
602 findHiFile mod_name hi_boot_file
604 -- In interactive or --make mode, we are *not allowed* to demand-load
605 -- a home package .hi file. So don't even look for them.
606 -- This helps in the case where you are sitting in eg. ghc/lib/std
607 -- and start up GHCi - it won't complain that all the modules it tries
608 -- to load are found in the home location.
609 ghci_mode <- readIORef v_GhcMode ;
610 let { home_allowed = hi_boot_file ||
611 not (isCompManagerMode ghci_mode) } ;
612 maybe_found <- if home_allowed
613 then findModule mod_name
614 else findPackageModule mod_name ;
616 case maybe_found of {
617 Nothing -> return Nothing ;
619 Just (mod,loc) -> do {
621 -- Return the path to M.hi, M.hi-boot, or M.hi-boot-n as appropriate
622 let { hi_path = ml_hi_file loc ;
623 hi_boot_path = replaceFilenameSuffix hi_path hiBootExt ;
624 hi_boot_ver_path = replaceFilenameSuffix hi_path hiBootVerExt
627 if not hi_boot_file then
628 return (Just (mod, hi_path))
630 hi_ver_exists <- doesFileExist hi_boot_ver_path ;
631 if hi_ver_exists then return (Just (mod, hi_boot_ver_path))
632 else return (Just (mod, hi_boot_path))
636 @readIface@ tries just the one file.
639 readIface :: Module -> String -> IsBootInterface -> TcRn m (Either Exception ParsedIface)
640 -- Nothing <=> file not found, or unreadable, or illegible
641 -- Just x <=> successfully found and parsed
643 readIface mod file_path is_hi_boot_file
644 = ioToTcRn (tryMost (read_iface mod file_path is_hi_boot_file))
646 read_iface mod file_path is_hi_boot_file
647 | is_hi_boot_file -- Read ascii
648 = do { buffer <- hGetStringBuffer file_path ;
649 case parseIface buffer (mkPState loc exts) of
650 POk _ iface | wanted_mod_name == actual_mod_name
653 -> throwDyn (ProgramError (showSDoc err))
654 -- 'showSDoc' is a bit yukky
656 wanted_mod_name = moduleName mod
657 actual_mod_name = pi_mod iface
658 err = hiModuleNameMismatchWarn wanted_mod_name actual_mod_name
660 PFailed err -> throwDyn (ProgramError (showSDoc err))
663 | otherwise -- Read binary
664 = readBinIface file_path
667 exts = ExtFlags {glasgowExtsEF = True,
671 loc = mkSrcLoc (mkFastString file_path) 1
675 %*********************************************************
677 Wired-in interface for GHC.Prim
679 %*********************************************************
682 ghcPrimIface :: ParsedIface
683 ghcPrimIface = ParsedIface {
684 pi_mod = gHC_PRIM_Name,
685 pi_pkg = basePackage,
686 pi_deps = noDependencies,
690 pi_exports = (1, [(gHC_PRIM_Name, ghcPrimExports)]),
691 pi_decls = [(1,cCallableClassDecl),
692 (1,cReturnableClassDecl)],
693 pi_fixity = [FixitySig (nameRdrName (idName seqId))
694 (Fixity 0 InfixR) noSrcLoc],
702 %*********************************************************
706 %*********************************************************
709 noIfaceErr mod_name boot_file
710 = ptext SLIT("Could not find interface file for") <+> quotes (ppr mod_name)
711 -- We used to print the search path, but we can't do that
712 -- now, because it's hidden inside the finder.
713 -- Maybe the finder should expose more functions.
715 badIfaceFile file err
716 = vcat [ptext SLIT("Bad interface file:") <+> text file,
719 hiModuleNameMismatchWarn :: ModuleName -> ModuleName -> Message
720 hiModuleNameMismatchWarn requested_mod read_mod =
721 hsep [ ptext SLIT("Something is amiss; requested module name")
723 , ptext SLIT("differs from name found in the interface file")
727 warnRedundantSourceImport mod_name
728 = ptext SLIT("Unnecessary {- SOURCE -} in the import of module")
729 <+> quotes (ppr mod_name)
732 = ptext SLIT("Importing my own interface: module") <+> ppr mod