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 ( replaceFilenameSuffix )
18 import CmdLineOpts ( opt_IgnoreIfacePragmas, verbosity )
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 mkDataConWrapperOcc, mkDataConWorkerOcc )
58 import TyCon ( DataConDetails(..) )
59 import SrcLoc ( noSrcLoc, mkSrcLoc )
60 import Maybes ( maybeToBool )
61 import StringBuffer ( hGetStringBuffer )
62 import FastString ( mkFastString )
63 import ErrUtils ( Message )
64 import Finder ( findModule, findPackageModule,
65 hiBootExt, hiBootVerExt )
68 import ListSetOps ( minusList )
71 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 -- Now add info about this module to the PIT
229 -- Even home modules loaded by this route (which only
230 -- happens in OneShot mode) are put in the PIT
231 has_orphans = pi_orphan iface
232 new_pit = extendModuleEnv pit mod mod_iface
233 mod_iface = ModIface { mi_module = mod, mi_package = pi_pkg iface,
234 mi_version = version,
235 mi_orphan = has_orphans, mi_boot = hi_boot_file,
237 mi_fixities = fix_env, mi_deprecs = deprec_env,
238 mi_deps = pi_deps iface,
239 mi_usages = panic "No mi_usages in PIT",
240 mi_decls = panic "No mi_decls in PIT",
244 new_eps = eps { eps_PIT = new_pit,
245 eps_decls = new_decls,
246 eps_insts = new_insts,
247 eps_rules = new_rules }
249 setEps new_eps `thenM_`
253 -----------------------------------------------------
254 -- Loading the export list
255 -----------------------------------------------------
257 loadExports :: (Version, [RdrExportItem]) -> TcRn m (Version, [(ModuleName,Avails)])
258 loadExports (vers, items)
259 = mappM loadExport items `thenM` \ avails_s ->
260 returnM (vers, avails_s)
263 loadExport :: RdrExportItem -> TcRn m (ModuleName, Avails)
264 loadExport (mod, entities)
265 = mappM (load_entity mod) entities `thenM` \ avails ->
266 returnM (mod, avails)
268 load_entity mod (Avail occ)
269 = newGlobalName2 mod occ `thenM` \ name ->
271 load_entity mod (AvailTC occ occs)
272 = newGlobalName2 mod occ `thenM` \ name ->
273 mappM (newGlobalName2 mod) occs `thenM` \ names ->
274 returnM (AvailTC name names)
277 -----------------------------------------------------
278 -- Loading type/class/value decls
279 -----------------------------------------------------
283 -> [(Version, RdrNameTyClDecl)]
284 -> TcRn m (NameEnv Version, DeclsMap)
285 loadDecls mod (decls_map, n_slurped) decls
286 = foldlM (loadDecl mod) (emptyNameEnv, decls_map) decls `thenM` \ (vers, decls_map') ->
287 returnM (vers, (decls_map', n_slurped))
289 loadDecl mod (version_map, decls_map) (version, decl)
290 = getTyClDeclBinders mod decl `thenM` \ avail ->
291 getSysBinders mod decl `thenM` \ sys_names ->
293 full_avail = case avail of
295 AvailTC n ns -> AvailTC n (sys_names ++ ns)
296 main_name = availName full_avail
297 new_decls_map = extendNameEnvList decls_map stuff
298 stuff = [ (name, (full_avail, name==main_name, (mod, decl)))
299 | name <- availNames full_avail]
301 new_version_map = extendNameEnv version_map main_name version
303 -- traceRn (text "Loading" <+> ppr full_avail) `thenM_`
304 returnM (new_version_map, new_decls_map)
309 getTyClDeclBinders :: Module -> RdrNameTyClDecl -> TcRn m AvailInfo
311 getTyClDeclBinders mod (IfaceSig {tcdName = var, tcdLoc = src_loc})
312 = newTopBinder mod var src_loc `thenM` \ var_name ->
313 returnM (Avail var_name)
315 getTyClDeclBinders mod tycl_decl
316 = mapM new (tyClDeclNames tycl_decl) `thenM` \ names@(main_name:_) ->
317 returnM (AvailTC main_name names)
319 new (nm,loc) = newTopBinder mod nm loc
321 --------------------------------
322 -- The "system names" are extra implicit names *bound* by the decl.
324 getSysBinders :: Module -> TyClDecl RdrName -> TcRn m [Name]
325 -- Similar to tyClDeclNames, but returns the "implicit"
326 -- or "system" names of the declaration. And it only works
327 -- on RdrNames, returning OccNames
329 getSysBinders mod (ClassDecl {tcdName = cname, tcdCtxt = cxt, tcdLoc = loc})
330 = mapM (new_sys_bndr mod loc) sys_occs
332 -- C.f. TcClassDcl.tcClassDecl1
333 sys_occs = tc_occ : data_occ : dwrap_occ : dwork_occ : sc_sel_occs
334 cls_occ = rdrNameOcc cname
335 data_occ = mkClassDataConOcc cls_occ
336 dwrap_occ = mkDataConWrapperOcc data_occ
337 dwork_occ = mkDataConWorkerOcc data_occ
338 tc_occ = mkClassTyConOcc cls_occ
339 sc_sel_occs = [mkSuperDictSelOcc n cls_occ | n <- [1..length cxt]]
341 getSysBinders mod (TyData {tcdName = tc_name, tcdCons = DataCons cons,
342 tcdGeneric = Just want_generic, tcdLoc = loc})
343 -- The 'Just' is because this is an interface-file decl
344 -- so it will say whether to derive generic stuff for it or not
345 = mapM (new_sys_bndr mod loc) (gen_occs ++ concatMap mk_con_occs cons)
348 -- c.f. TcTyDecls.tcTyDecl
349 tc_occ = rdrNameOcc tc_name
350 gen_occs | want_generic = [mkGenOcc1 tc_occ, mkGenOcc2 tc_occ]
352 mk_con_occs (ConDecl name _ _ _ _)
353 = [mkDataConWrapperOcc con_occ, mkDataConWorkerOcc con_occ]
355 con_occ = rdrNameOcc name -- The "source name"
357 getSysBinders mod decl = returnM []
359 new_sys_bndr mod loc occ = newTopBinder mod (mkRdrUnqual occ) loc
362 -----------------------------------------------------
363 -- Loading fixity decls
364 -----------------------------------------------------
367 = mappM loadFixDecl decls `thenM` \ to_add ->
368 returnM (mkNameEnv to_add)
370 loadFixDecl (FixitySig rdr_name fixity loc)
371 = lookupGlobalOccRn rdr_name `thenM` \ name ->
372 returnM (name, FixitySig name fixity loc)
375 -----------------------------------------------------
376 -- Loading instance decls
377 -----------------------------------------------------
379 loadInstDecls :: Module -> IfaceInsts
382 loadInstDecls mod (insts, n_slurped) decls
383 = foldlM (loadInstDecl mod) insts decls `thenM` \ insts' ->
384 returnM (insts', n_slurped)
387 loadInstDecl mod insts decl@(InstDecl inst_ty _ _ _ _)
388 = -- Find out what type constructors and classes are "gates" for the
389 -- instance declaration. If all these "gates" are slurped in then
390 -- we should slurp the instance decl too.
392 -- We *don't* want to count names in the context part as gates, though.
394 -- instance Foo a => Baz (T a) where ...
396 -- Here the gates are Baz and T, but *not* Foo.
398 -- HOWEVER: functional dependencies make things more complicated
399 -- class C a b | a->b where ...
400 -- instance C Foo Baz where ...
401 -- Here, the gates are really only C and Foo, *not* Baz.
402 -- That is, if C and Foo are visible, even if Baz isn't, we must
405 -- Rather than take fundeps into account "properly", we just slurp
406 -- if C is visible and *any one* of the Names in the types
407 -- This is a slightly brutal approximation, but most instance decls
408 -- are regular H98 ones and it's perfect for them.
410 -- NOTICE that we rename the type before extracting its free
411 -- variables. The free-variable finder for a renamed HsType
412 -- does the Right Thing for built-in syntax like [] and (,).
413 rnHsType (text "In an interface instance decl") inst_ty `thenM` \ inst_ty' ->
415 (tvs,_,cls,tys) = splitHsInstDeclTy inst_ty'
416 free_tcs = nameSetToList (extractHsTyNames_s tys) `minusList` hsTyVarNames tvs
418 gate_fn vis_fn = vis_fn cls && (null free_tcs || any vis_fn free_tcs)
419 -- The 'vis_fn' returns True for visible names
420 -- Here is the implementation of HOWEVER above
421 -- (Note that we do let the inst decl in if it mentions
422 -- no tycons at all. Hence the null free_ty_names.)
424 -- traceRn ((text "Load instance for" <+> ppr inst_ty') $$ ppr free_tcs) `thenM_`
425 returnM ((gate_fn, (mod, decl)) `consBag` insts)
429 -----------------------------------------------------
431 -----------------------------------------------------
435 -> (Version, [RdrNameRuleDecl])
436 -> RnM (Version, IfaceRules)
437 loadRules mod (rule_bag, n_slurped) (version, rules)
438 | null rules || opt_IgnoreIfacePragmas
439 = returnM (version, (rule_bag, n_slurped))
441 = mappM (loadRule mod) rules `thenM` \ new_rules ->
442 returnM (version, (rule_bag `unionBags` listToBag new_rules, n_slurped))
444 loadRule :: Module -> RdrNameRuleDecl -> RnM (GatedDecl RdrNameRuleDecl)
445 -- "Gate" the rule simply by whether the rule variable is
446 -- needed. We can refine this later.
447 loadRule mod decl@(IfaceRule _ _ _ var _ _ src_loc)
448 = lookupGlobalOccRn var `thenM` \ var_name ->
449 returnM (\vis_fn -> vis_fn var_name, (mod, decl))
452 -----------------------------------------------------
453 -- Loading Deprecations
454 -----------------------------------------------------
456 loadDeprecs :: IfaceDeprecs -> RnM Deprecations
457 loadDeprecs Nothing = returnM NoDeprecs
458 loadDeprecs (Just (Left txt)) = returnM (DeprecAll txt)
459 loadDeprecs (Just (Right prs)) = foldlM loadDeprec emptyNameEnv prs `thenM` \ env ->
460 returnM (DeprecSome env)
461 loadDeprec deprec_env (n, txt)
462 = lookupGlobalOccRn n `thenM` \ name ->
463 -- traceRn (text "Loaded deprecation(s) for" <+> ppr name <> colon <+> ppr txt) `thenM_`
464 returnM (extendNameEnv deprec_env name (name,txt))
468 %********************************************************
470 Load the ParsedIface for the *current* module
471 into a ModIface; then it can be checked
474 %********************************************************
477 loadOldIface :: ParsedIface -> RnM ModIface
480 = loadHomeDecls (pi_decls iface) `thenM` \ (decls_vers, new_decls) ->
481 loadHomeRules (pi_rules iface) `thenM` \ (rule_vers, new_rules) ->
482 loadHomeInsts (pi_insts iface) `thenM` \ new_insts ->
483 mappM loadHomeUsage (pi_usages iface) `thenM` \ usages ->
484 loadExports (pi_exports iface) `thenM` \ (export_vers, avails) ->
485 loadFixDecls (pi_fixity iface) `thenM` \ fix_env ->
486 loadDeprecs (pi_deprecs iface) `thenM` \ deprec_env ->
488 getModeRn `thenM` \ (InterfaceMode mod) ->
489 -- Caller sets the module before the call; also needed
490 -- by the newGlobalName stuff in some of the loadHomeX calls
492 version = VersionInfo { vers_module = pi_vers iface,
493 vers_exports = export_vers,
494 vers_rules = rule_vers,
495 vers_decls = decls_vers }
497 decls = mkIfaceDecls new_decls new_rules new_insts
499 mod_iface = ModIface { mi_module = mod, mi_package = pi_pkg iface,
500 mi_version = version, mi_deps = pi_deps iface,
501 mi_exports = avails, mi_usages = usages,
502 mi_boot = False, mi_orphan = pi_orphan iface,
503 mi_fixities = fix_env, mi_deprecs = deprec_env,
512 loadHomeDecls :: [(Version, RdrNameTyClDecl)]
513 -> RnM (NameEnv Version, [RenamedTyClDecl])
514 loadHomeDecls decls = foldlM loadHomeDecl (emptyNameEnv, []) decls
516 loadHomeDecl :: (NameEnv Version, [RenamedTyClDecl])
517 -> (Version, RdrNameTyClDecl)
518 -> RnM (NameEnv Version, [RenamedTyClDecl])
519 loadHomeDecl (version_map, decls) (version, decl)
520 = rnTyClDecl decl `thenM` \ decl' ->
521 returnM (extendNameEnv version_map (tyClDeclName decl') version, decl':decls)
524 loadHomeRules :: (Version, [RdrNameRuleDecl])
525 -> RnM (Version, [RenamedRuleDecl])
526 loadHomeRules (version, rules)
527 = mappM rnIfaceRuleDecl rules `thenM` \ rules' ->
528 returnM (version, rules')
531 loadHomeInsts :: [RdrNameInstDecl]
532 -> RnM [RenamedInstDecl]
533 loadHomeInsts insts = mappM rnInstDecl insts
536 loadHomeUsage :: Usage OccName -> TcRn m (Usage Name)
538 = mappM rn_imp (usg_entities usage) `thenM` \ entities' ->
539 returnM (usage { usg_entities = entities' })
541 mod_name = usg_name usage
542 rn_imp (occ,vers) = newGlobalName2 mod_name occ `thenM` \ name ->
547 %*********************************************************
549 \subsection{Reading an interface file}
551 %*********************************************************
554 findAndReadIface :: SDoc -> ModuleName
555 -> IsBootInterface -- True <=> Look for a .hi-boot file
556 -- False <=> Look for .hi file
557 -> TcRn m (Either Message (Module, ParsedIface))
558 -- Nothing <=> file not found, or unreadable, or illegible
559 -- Just x <=> successfully found and parsed
561 -- It *doesn't* add an error to the monad, because
562 -- sometimes it's ok to fail... see notes with loadInterface
564 findAndReadIface doc_str mod_name hi_boot_file
565 = traceRn trace_msg `thenM_`
567 -- Check for GHC.Prim, and return its static interface
568 if mod_name == gHC_PRIM_Name
569 then returnM (Right (gHC_PRIM, ghcPrimIface))
572 ioToTcRn (findHiFile mod_name hi_boot_file) `thenM` \ maybe_found ->
576 traceRn (ptext SLIT("...not found")) `thenM_`
577 getDOpts `thenM` \ dflags ->
578 returnM (Left (noIfaceErr dflags mod_name hi_boot_file files))
580 Right (wanted_mod, file_path) ->
581 traceRn (ptext SLIT("readIFace") <+> text file_path) `thenM_`
583 readIface wanted_mod file_path hi_boot_file `thenM` \ read_result ->
584 -- Catch exceptions here
587 Left exn -> returnM (Left (badIfaceFile file_path
588 (text (showException exn))))
590 Right iface -> returnM (Right (wanted_mod, iface))
593 trace_msg = sep [hsep [ptext SLIT("Reading"),
594 if hi_boot_file then ptext SLIT("[boot]") else empty,
595 ptext SLIT("interface for"),
596 ppr mod_name <> semi],
597 nest 4 (ptext SLIT("reason:") <+> doc_str)]
599 findHiFile :: ModuleName -> IsBootInterface
600 -> IO (Either [FilePath] (Module, FilePath))
601 findHiFile mod_name hi_boot_file
603 -- In interactive or --make mode, we are *not allowed* to demand-load
604 -- a home package .hi file. So don't even look for them.
605 -- This helps in the case where you are sitting in eg. ghc/lib/std
606 -- and start up GHCi - it won't complain that all the modules it tries
607 -- to load are found in the home location.
608 ghci_mode <- readIORef v_GhcMode ;
609 let { home_allowed = hi_boot_file ||
610 not (isCompManagerMode ghci_mode) } ;
611 maybe_found <- if home_allowed
612 then findModule mod_name
613 else findPackageModule mod_name ;
615 case maybe_found of {
616 Left files -> return (Left files) ;
618 Right (mod,loc) -> do {
620 -- Return the path to M.hi, M.hi-boot, or M.hi-boot-n as appropriate
621 let { hi_path = ml_hi_file loc ;
622 hi_boot_path = replaceFilenameSuffix hi_path hiBootExt ;
623 hi_boot_ver_path = replaceFilenameSuffix hi_path hiBootVerExt
626 if not hi_boot_file then
627 return (Right (mod, hi_path))
629 hi_ver_exists <- doesFileExist hi_boot_ver_path ;
630 if hi_ver_exists then return (Right (mod, hi_boot_ver_path))
631 else return (Right (mod, hi_boot_path))
635 @readIface@ tries just the one file.
638 readIface :: Module -> String -> IsBootInterface -> TcRn m (Either Exception ParsedIface)
639 -- Nothing <=> file not found, or unreadable, or illegible
640 -- Just x <=> successfully found and parsed
642 readIface mod file_path is_hi_boot_file
643 = ioToTcRn (tryMost (read_iface mod file_path is_hi_boot_file))
645 read_iface mod file_path is_hi_boot_file
646 | is_hi_boot_file -- Read ascii
647 = do { buffer <- hGetStringBuffer file_path ;
648 case parseIface buffer (mkPState loc exts) of
649 POk _ iface | wanted_mod_name == actual_mod_name
652 -> throwDyn (ProgramError (showSDoc err))
653 -- 'showSDoc' is a bit yukky
655 wanted_mod_name = moduleName mod
656 actual_mod_name = pi_mod iface
657 err = hiModuleNameMismatchWarn wanted_mod_name actual_mod_name
659 PFailed err -> throwDyn (ProgramError (showSDoc err))
662 | otherwise -- Read binary
663 = readBinIface file_path
666 exts = ExtFlags {glasgowExtsEF = True,
670 loc = mkSrcLoc (mkFastString file_path) 1
674 %*********************************************************
676 Wired-in interface for GHC.Prim
678 %*********************************************************
681 ghcPrimIface :: ParsedIface
682 ghcPrimIface = ParsedIface {
683 pi_mod = gHC_PRIM_Name,
684 pi_pkg = basePackage,
685 pi_deps = noDependencies,
689 pi_exports = (1, [(gHC_PRIM_Name, ghcPrimExports)]),
690 pi_decls = [(1,cCallableClassDecl),
691 (1,cReturnableClassDecl)],
692 pi_fixity = [FixitySig (nameRdrName (idName seqId))
693 (Fixity 0 InfixR) noSrcLoc],
701 %*********************************************************
705 %*********************************************************
708 badIfaceFile file err
709 = vcat [ptext SLIT("Bad interface file:") <+> text file,
712 hiModuleNameMismatchWarn :: ModuleName -> ModuleName -> Message
713 hiModuleNameMismatchWarn requested_mod read_mod =
714 hsep [ ptext SLIT("Something is amiss; requested module name")
716 , ptext SLIT("differs from name found in the interface file")
720 warnRedundantSourceImport mod_name
721 = ptext SLIT("Unnecessary {- SOURCE -} in the import of module")
722 <+> quotes (ppr mod_name)
725 = ptext SLIT("Importing my own interface: module") <+> ppr mod