2 % (c) The University of Glasgow 2006
3 % (c) The GRASP/AQUA Project, Glasgow University, 1993-1998
8 mkUsageInfo, -- Construct the usage info for a module
10 mkIface, -- Build a ModIface from a ModGuts,
11 -- including computing version information
13 writeIfaceFile, -- Write the interface file
15 checkOldIface, -- See if recompilation is required, by
16 -- comparing version information
18 tyThingToIfaceDecl -- Converting things to their Iface equivalents
22 -----------------------------------------------
23 MkIface.lhs deals with versioning
24 -----------------------------------------------
26 Here's the version-related info in an interface file
28 module Foo 8 -- module-version
29 3 -- export-list-version
31 Usages: -- Version info for what this compilation of Foo imported
32 Baz 3 -- Module version
33 [4] -- The export-list version if Foo depended on it
34 (g,2) -- Function and its version
35 (T,1) -- Type and its version
37 <version> f :: Int -> Int {- Unfolding: \x -> Wib.t[2] x -}
38 -- The [2] says that f's unfolding
39 -- mentions verison 2 of Wib.t
41 -----------------------------------------------
43 -----------------------------------------------
46 * In the mi_usages information in an interface, we record the
47 version number of each free variable of the module
49 * In mkIface, we compute the version number of each exported thing A.f
50 by comparing its A.f's info with its new info, and bumping its
51 version number if it differs. If A.f mentions B.g, and B.g's version
52 number has changed, then we count A.f as having changed too.
54 * In checkOldIface we compare the mi_usages for the module with
55 the actual version info for all each thing recorded in mi_usages
60 We count A.f as changing if its fixity changes
64 If a rule changes, we want to recompile any module that might be
65 affected by that rule. For non-orphan rules, this is relatively easy.
66 If module M defines f, and a rule for f, just arrange that the version
67 number for M.f changes if any of the rules for M.f change. Any module
68 that does not depend on M.f can't be affected by the rule-change
71 Orphan rules (ones whose 'head function' is not defined in M) are
72 harder. Here's what we do.
74 * We have a per-module orphan-rule version number which changes if
75 any orphan rule changes. (It's unaffected by non-orphan rules.)
77 * We record usage info for any orphan module 'below' this one,
78 giving the orphan-rule version number. We recompile if this
81 The net effect is that if an orphan rule changes, we recompile every
82 module above it. That's very conservative, but it's devilishly hard
83 to know what it might affect, so we just have to be conservative.
87 In an iface file we have
89 instance Eq a => Eq [a] = dfun29
92 We have a version number for dfun29, covering its unfolding
93 etc. Suppose we are compiling a module M that imports A only
94 indirectly. If typechecking M uses this instance decl, we record the
95 dependency on A.dfun29 as if it were a free variable of the module
96 (via the tcg_inst_usages accumulator). That means that A will appear
97 in M's usage list. If the shape of the instance declaration changes,
98 then so will dfun29's version, triggering a recompilation.
100 Adding an instance declaration, or changing an instance decl that is
101 not currently used, is more tricky. (This really only makes a
102 difference when we have overlapping instance decls, because then the
103 new instance decl might kick in to override the old one.) We handle
104 this in a very similar way that we handle rules above.
106 * For non-orphan instance decls, identify one locally-defined tycon/class
107 mentioned in the decl. Treat the instance decl as part of the defn of that
108 tycon/class, so that if the shape of the instance decl changes, so does the
109 tycon/class; that in turn will force recompilation of anything that uses
112 * For orphan instance decls, act the same way as for orphan rules.
113 Indeed, we use the same global orphan-rule version number.
117 mkUsageInfo figures out what the ``usage information'' for this
118 moudule is; that is, what it must record in its interface file as the
121 We produce a line for every module B below the module, A, currently being
124 to record the fact that A does import B indirectly. This is used to decide
125 to look to look for B.hi rather than B.hi-boot when compiling a module that
126 imports A. This line says that A imports B, but uses nothing in it.
127 So we'll get an early bale-out when compiling A if B's version changes.
129 The usage information records:
132 \item (a) anything reachable from its body code
133 \item (b) any module exported with a @module Foo@
134 \item (c) anything reachable from an exported item
137 Why (b)? Because if @Foo@ changes then this module's export list
138 will change, so we must recompile this module at least as far as
139 making a new interface file --- but in practice that means complete
142 Why (c)? Consider this:
144 module A( f, g ) where | module B( f ) where
145 import B( f ) | f = h 3
149 Here, @B.f@ isn't used in A. Should we nevertheless record @B.f@ in
150 @A@'s usages? Our idea is that we aren't going to touch A.hi if it is
151 *identical* to what it was before. If anything about @B.f@ changes
152 than anyone who imports @A@ should be recompiled in case they use
153 @B.f@ (they'll get an early exit if they don't). So, if anything
154 about @B.f@ changes we'd better make sure that something in A.hi
155 changes, and the convenient way to do that is to record the version
156 number @B.f@ in A.hi in the usage list. If B.f changes that'll force a
157 complete recompiation of A, which is overkill but it's the only way to
158 write a new, slightly different, A.hi.
160 But the example is tricker. Even if @B.f@ doesn't change at all,
161 @B.h@ may do so, and this change may not be reflected in @f@'s version
162 number. But with -O, a module that imports A must be recompiled if
163 @B.h@ changes! So A must record a dependency on @B.h@. So we treat
164 the occurrence of @B.f@ in the export list *just as if* it were in the
165 code of A, and thereby haul in all the stuff reachable from it.
167 *** Conclusion: if A mentions B.f in its export list,
168 behave just as if A mentioned B.f in its source code,
169 and slurp in B.f and all its transitive closure ***
171 [NB: If B was compiled with -O, but A isn't, we should really *still*
172 haul in all the unfoldings for B, in case the module that imports A *is*
173 compiled with -O. I think this is the case.]
177 #include "HsVersions.h"
208 import PackageConfig hiding ( Version )
210 import BasicTypes hiding ( SuccessFlag(..) )
212 import Util hiding ( eqListBy )
223 %************************************************************************
225 \subsection{Completing an interface}
227 %************************************************************************
231 -> Maybe ModIface -- The old interface, if we have it
232 -> ModGuts -- Usages, deprecations, etc
233 -> ModDetails -- The trimmed, tidied interface
234 -> IO (ModIface, -- The new one, complete with decls and versions
235 Bool) -- True <=> there was an old Iface, and the new one
236 -- is identical, so no need to write it
238 mkIface hsc_env maybe_old_iface
239 (ModGuts{ mg_module = this_mod,
243 mg_rdr_env = rdr_env,
244 mg_fix_env = fix_env,
245 mg_deprecs = src_deprecs })
246 (ModDetails{ md_insts = insts,
247 md_fam_insts = fam_insts,
250 md_exports = exports })
252 -- NB: notice that mkIface does not look at the bindings
253 -- only at the TypeEnv. The previous Tidy phase has
254 -- put exactly the info into the TypeEnv that we want
255 -- to expose in the interface
257 = do { eps <- hscEPS hsc_env
258 ; let { entities = typeEnvElts type_env ;
259 decls = [ tyThingToIfaceDecl entity
260 | entity <- entities,
261 not (isImplicitTyThing entity
262 || isWiredInName (getName entity)) ]
263 -- Don't put implicit Ids and class tycons in
264 -- the interface file, Nor wired-in things; the
265 -- compiler knows about them anyhow
267 ; fixities = [(occ,fix) | FixItem occ fix _ <- nameEnvElts fix_env]
268 ; deprecs = mkIfaceDeprec src_deprecs
269 ; iface_rules = map coreRuleToIfaceRule rules
270 ; iface_insts = map instanceToIfaceInst insts
271 ; iface_fam_insts = map famInstToIfaceFamInst fam_insts
273 ; intermediate_iface = ModIface {
274 mi_module = this_mod,
278 mi_exports = mkIfaceExports exports,
279 mi_insts = sortLe le_inst iface_insts,
280 mi_fam_insts= sortLe le_fam_inst iface_fam_insts,
281 mi_rules = sortLe le_rule iface_rules,
282 mi_fixities = fixities,
283 mi_deprecs = deprecs,
284 mi_globals = Just rdr_env,
286 -- Left out deliberately: filled in by addVersionInfo
287 mi_mod_vers = initialVersion,
288 mi_exp_vers = initialVersion,
289 mi_rule_vers = initialVersion,
290 mi_orphan = False, -- Always set by addVersionInfo, but
291 -- it's a strict field, so we can't omit it.
292 mi_finsts = False, -- Ditto
293 mi_decls = deliberatelyOmitted "decls",
294 mi_ver_fn = deliberatelyOmitted "ver_fn",
296 -- And build the cached values
297 mi_dep_fn = mkIfaceDepCache deprecs,
298 mi_fix_fn = mkIfaceFixCache fixities }
300 -- Add version information
301 ; ext_ver_fn = mkParentVerFun hsc_env eps
302 ; (new_iface, no_change_at_all, pp_diffs, pp_orphs)
303 = _scc_ "versioninfo"
304 addVersionInfo ext_ver_fn maybe_old_iface
305 intermediate_iface decls
309 ; when (isJust pp_orphs && dopt Opt_WarnOrphans dflags)
310 (printDump (expectJust "mkIface" pp_orphs))
311 ; when (dopt Opt_D_dump_hi_diffs dflags) (printDump pp_diffs)
312 ; dumpIfSet_dyn dflags Opt_D_dump_hi "FINAL INTERFACE"
313 (pprModIface new_iface)
315 ; return (new_iface, no_change_at_all) }
317 r1 `le_rule` r2 = ifRuleName r1 <= ifRuleName r2
318 i1 `le_inst` i2 = ifDFun i1 <= ifDFun i2
319 i1 `le_fam_inst` i2 = ifFamInstTyConOcc i1 <= ifFamInstTyConOcc i2
321 dflags = hsc_dflags hsc_env
322 deliberatelyOmitted x = panic ("Deliberately omitted: " ++ x)
323 ifFamInstTyConOcc = nameOccName . ifaceTyConName . ifFamInstTyCon
326 -----------------------------
327 writeIfaceFile :: DynFlags -> ModLocation -> ModIface -> IO ()
328 writeIfaceFile dflags location new_iface
329 = do createDirectoryHierarchy (directoryOf hi_file_path)
330 writeBinIface dflags hi_file_path new_iface
331 where hi_file_path = ml_hi_file location
334 -- -----------------------------------------------------------------------------
335 -- Look up parents and versions of Names
337 -- This is like a global version of the mi_ver_fn field in each ModIface.
338 -- Given a Name, it finds the ModIface, and then uses mi_ver_fn to get
339 -- the parent and version info.
342 :: HscEnv -- needed to look up versions
343 -> ExternalPackageState -- ditto
344 -> (Name -> (OccName,Version))
345 mkParentVerFun hsc_env eps
348 mod = nameModule name
349 occ = nameOccName name
350 iface = lookupIfaceByModule (hsc_dflags hsc_env) hpt pit mod `orElse`
351 pprPanic "lookupVers2" (ppr mod <+> ppr occ)
353 mi_ver_fn iface occ `orElse`
354 pprPanic "lookupVers1" (ppr mod <+> ppr occ)
356 hpt = hsc_HPT hsc_env
359 -----------------------------------------------------------------------------
360 -- Compute version numbers for local decls
363 :: (Name -> (OccName,Version)) -- lookup parents and versions of names
364 -> Maybe ModIface -- The old interface, read from M.hi
365 -> ModIface -- The new interface (lacking decls)
366 -> [IfaceDecl] -- The new decls
367 -> (ModIface, -- Updated interface
368 Bool, -- True <=> no changes at all; no need to write Iface
370 Maybe SDoc) -- Warnings about orphans
372 addVersionInfo ver_fn Nothing new_iface new_decls
373 -- No old interface, so definitely write a new one!
374 = (new_iface { mi_orphan = anyNothing ifInstOrph (mi_insts new_iface)
375 || anyNothing ifRuleOrph (mi_rules new_iface)
376 , mi_finsts = not . null $ mi_fam_insts new_iface
377 , mi_decls = [(initialVersion, decl) | decl <- new_decls]
378 , mi_ver_fn = mkIfaceVerCache (zip (repeat initialVersion)
382 ptext SLIT("No old interface file"),
383 pprOrphans orph_insts orph_rules)
385 orph_insts = filter (isNothing . ifInstOrph) (mi_insts new_iface)
386 orph_rules = filter (isNothing . ifRuleOrph) (mi_rules new_iface)
388 addVersionInfo ver_fn (Just old_iface@(ModIface {
389 mi_mod_vers = old_mod_vers,
390 mi_exp_vers = old_exp_vers,
391 mi_rule_vers = old_rule_vers,
392 mi_decls = old_decls,
393 mi_ver_fn = old_decl_vers,
394 mi_fix_fn = old_fixities }))
395 new_iface@(ModIface { mi_fix_fn = new_fixities })
398 = (old_iface, True, ptext SLIT("Interface file unchanged"), pp_orphs)
400 = (final_iface, False, vcat [ptext SLIT("Interface file has changed"),
401 nest 2 pp_diffs], pp_orphs)
403 final_iface = new_iface {
404 mi_mod_vers = bump_unless no_output_change old_mod_vers,
405 mi_exp_vers = bump_unless no_export_change old_exp_vers,
406 mi_rule_vers = bump_unless no_rule_change old_rule_vers,
407 mi_orphan = not (null new_orph_rules && null new_orph_insts),
408 mi_finsts = not . null $ mi_fam_insts new_iface,
409 mi_decls = decls_w_vers,
410 mi_ver_fn = mkIfaceVerCache decls_w_vers }
412 decls_w_vers = [(add_vers decl, decl) | decl <- new_decls]
415 (old_non_orph_insts, old_orph_insts) =
416 mkOrphMap ifInstOrph (mi_insts old_iface)
417 (new_non_orph_insts, new_orph_insts) =
418 mkOrphMap ifInstOrph (mi_insts new_iface)
419 old_fam_insts = mi_fam_insts old_iface
420 new_fam_insts = mi_fam_insts new_iface
421 same_insts occ = eqMaybeBy (eqListBy eqIfInst)
422 (lookupOccEnv old_non_orph_insts occ)
423 (lookupOccEnv new_non_orph_insts occ)
425 (old_non_orph_rules, old_orph_rules) =
426 mkOrphMap ifRuleOrph (mi_rules old_iface)
427 (new_non_orph_rules, new_orph_rules) =
428 mkOrphMap ifRuleOrph (mi_rules new_iface)
429 same_rules occ = eqMaybeBy (eqListBy eqIfRule)
430 (lookupOccEnv old_non_orph_rules occ)
431 (lookupOccEnv new_non_orph_rules occ)
433 -- Computing what changed
434 no_output_change = no_decl_change && no_rule_change &&
435 no_export_change && no_deprec_change
436 no_export_change = mi_exports new_iface == mi_exports old_iface
438 no_decl_change = isEmptyOccSet changed_occs
439 no_rule_change = not (changedWrtNames changed_occs (eqListBy eqIfRule old_orph_rules new_orph_rules)
440 || changedWrtNames changed_occs (eqListBy eqIfInst old_orph_insts new_orph_insts)
441 || changedWrtNames changed_occs (eqListBy eqIfFamInst old_fam_insts new_fam_insts))
442 no_deprec_change = mi_deprecs new_iface == mi_deprecs old_iface
444 -- If the usages havn't changed either, we don't need to write the interface file
445 no_other_changes = mi_usages new_iface == mi_usages old_iface &&
446 mi_deps new_iface == mi_deps old_iface
447 no_change_at_all = no_output_change && no_other_changes
449 pp_diffs = vcat [pp_change no_export_change "Export list"
450 (ppr old_exp_vers <+> arrow <+> ppr (mi_exp_vers final_iface)),
451 pp_change no_rule_change "Rules"
452 (ppr old_rule_vers <+> arrow <+> ppr (mi_rule_vers final_iface)),
453 pp_change no_deprec_change "Deprecations" empty,
454 pp_change no_other_changes "Usages" empty,
456 pp_change True what info = empty
457 pp_change False what info = text what <+> ptext SLIT("changed") <+> info
460 old_decl_env = mkOccEnv [(ifName decl, decl) | (_,decl) <- old_decls]
461 same_fixity n = bool (old_fixities n == new_fixities n)
464 -- Adding version info
465 new_version = bumpVersion old_mod_vers
466 -- Start from the old module version, not from
467 -- zero so that if you remove f, and then add
468 -- it again, you don't thereby reduce f's
471 add_vers decl | occ `elemOccSet` changed_occs = new_version
472 | otherwise = snd (expectJust "add_vers" (old_decl_vers occ))
473 -- If it's unchanged, there jolly well
474 where -- should be an old version number
478 -- Deciding which declarations have changed
480 -- For each local decl, the IfaceEq gives the list of things that
481 -- must be unchanged for the declaration as a whole to be unchanged.
482 eq_info :: [(OccName, IfaceEq)]
483 eq_info = map check_eq new_decls
485 | Just old_decl <- lookupOccEnv old_decl_env occ
486 = (occ, new_decl `eqIfDecl` old_decl &&& eq_indirects new_decl)
487 | otherwise {- No corresponding old decl -}
490 occ = ifName new_decl
492 eq_indirects :: IfaceDecl -> IfaceEq
493 -- When seeing if two decls are the same, remember to
494 -- check whether any relevant fixity or rules have changed
495 eq_indirects (IfaceId {ifName = occ}) = eq_ind_occ occ
496 eq_indirects (IfaceClass {ifName = cls_occ, ifSigs = sigs})
497 = same_insts cls_occ &&&
498 eq_ind_occs [op | IfaceClassOp op _ _ <- sigs]
499 eq_indirects (IfaceData {ifName = tc_occ, ifCons = cons})
500 = same_insts tc_occ &&& same_fixity tc_occ &&& -- The TyCon can have a fixity too
501 eq_ind_occs (map ifConOcc (visibleIfConDecls cons))
502 eq_indirects other = Equal -- Synonyms and foreign declarations
504 eq_ind_occ :: OccName -> IfaceEq -- For class ops and Ids; check fixity and rules
505 eq_ind_occ occ = same_fixity occ &&& same_rules occ
506 eq_ind_occs = foldr ((&&&) . eq_ind_occ) Equal
508 -- The Occs of declarations that changed.
509 changed_occs :: OccSet
510 changed_occs = computeChangedOccs ver_fn (mi_module new_iface)
511 (mi_usages old_iface) eq_info
515 pp_decl_diffs :: SDoc -- Nothing => no changes
517 | isEmptyOccSet changed_occs = empty
519 = vcat [ptext SLIT("Changed occs:") <+> ppr (occSetElts changed_occs),
520 ptext SLIT("Version change for these decls:"),
521 nest 2 (vcat (map show_change new_decls))]
523 eq_env = mkOccEnv eq_info
525 | not (occ `elemOccSet` changed_occs) = empty
527 = vcat [ppr occ <+> ppr (old_decl_vers occ) <+> arrow <+> ppr new_version,
530 occ = ifName new_decl
531 why = case lookupOccEnv eq_env occ of
532 Just (EqBut names) -> sep [ppr occ <> colon, ptext SLIT("Free vars (only) changed:"),
533 nest 2 (braces (fsep (map ppr (occSetElts
534 (occs `intersectOccSet` changed_occs)))))]
535 where occs = mkOccSet (map nameOccName (nameSetToList names))
537 | Just old_decl <- lookupOccEnv old_decl_env occ
538 -> vcat [ptext SLIT("Old:") <+> ppr old_decl,
539 ptext SLIT("New:") <+> ppr new_decl]
541 -> ppr occ <+> ptext SLIT("only in new interface")
542 other -> pprPanic "MkIface.show_change" (ppr occ)
544 pp_orphs = pprOrphans new_orph_insts new_orph_rules
547 pprOrphans insts rules
548 | null insts && null rules = Nothing
551 if null insts then empty else
552 hang (ptext SLIT("Warning: orphan instances:"))
553 2 (vcat (map ppr insts)),
554 if null rules then empty else
555 hang (ptext SLIT("Warning: orphan rules:"))
556 2 (vcat (map ppr rules))
560 :: (Name -> (OccName,Version)) -- get parents and versions
561 -> Module -- This module
562 -> [Usage] -- Usages from old iface
563 -> [(OccName, IfaceEq)] -- decl names, equality conditions
564 -> OccSet -- set of things that have changed
565 computeChangedOccs ver_fn this_module old_usages eq_info
566 = foldl add_changes emptyOccSet (stronglyConnComp edges)
569 -- return True if an external name has changed
570 name_changed :: Name -> Bool
572 | Just ents <- lookupUFM usg_modmap (moduleName mod)
573 = case lookupUFM ents parent_occ of
574 Nothing -> pprPanic "computeChangedOccs" (ppr nm)
575 Just v -> v < new_version
576 | otherwise = False -- must be in another package
579 (parent_occ, new_version) = ver_fn nm
581 -- Turn the usages from the old ModIface into a mapping
582 usg_modmap = listToUFM [ (usg_mod usg, listToUFM (usg_entities usg))
583 | usg <- old_usages ]
585 get_local_eq_info :: GenIfaceEq NameSet -> GenIfaceEq OccSet
586 get_local_eq_info Equal = Equal
587 get_local_eq_info NotEqual = NotEqual
588 get_local_eq_info (EqBut ns) = foldNameSet f Equal ns
589 where f name eq | nameModule name == this_module =
590 EqBut (unitOccSet (nameOccName name)) `and_occifeq` eq
591 | name_changed name = NotEqual
594 local_eq_infos = mapSnd get_local_eq_info eq_info
596 edges :: [((OccName, OccIfaceEq), Unique, [Unique])]
597 edges = [ (node, getUnique occ, map getUnique occs)
598 | node@(occ, iface_eq) <- local_eq_infos
599 , let occs = case iface_eq of
600 EqBut occ_set -> occSetElts occ_set
603 -- Changes in declarations
604 add_changes :: OccSet -> SCC (OccName, OccIfaceEq) -> OccSet
605 add_changes so_far (AcyclicSCC (occ, iface_eq))
606 | changedWrt so_far iface_eq -- This one has changed
607 = extendOccSet so_far occ
608 add_changes so_far (CyclicSCC pairs)
609 | changedWrt so_far (foldr1 and_occifeq iface_eqs)
610 -- One of this group has changed
611 = extendOccSetList so_far occs
612 where (occs, iface_eqs) = unzip pairs
613 add_changes so_far other = so_far
615 type OccIfaceEq = GenIfaceEq OccSet
617 changedWrt :: OccSet -> OccIfaceEq -> Bool
618 changedWrt so_far Equal = False
619 changedWrt so_far NotEqual = True
620 changedWrt so_far (EqBut kids) = so_far `intersectsOccSet` kids
622 changedWrtNames :: OccSet -> IfaceEq -> Bool
623 changedWrtNames so_far Equal = False
624 changedWrtNames so_far NotEqual = True
625 changedWrtNames so_far (EqBut kids) =
626 so_far `intersectsOccSet` mkOccSet (map nameOccName (nameSetToList kids))
628 and_occifeq :: OccIfaceEq -> OccIfaceEq -> OccIfaceEq
629 Equal `and_occifeq` x = x
630 NotEqual `and_occifeq` x = NotEqual
631 EqBut nms `and_occifeq` Equal = EqBut nms
632 EqBut nms `and_occifeq` NotEqual = NotEqual
633 EqBut nms1 `and_occifeq` EqBut nms2 = EqBut (nms1 `unionOccSets` nms2)
635 ----------------------
636 -- mkOrphMap partitions instance decls or rules into
637 -- (a) an OccEnv for ones that are not orphans,
638 -- mapping the local OccName to a list of its decls
639 -- (b) a list of orphan decls
640 mkOrphMap :: (decl -> Maybe OccName) -- (Just occ) for a non-orphan decl, keyed by occ
641 -- Nothing for an orphan decl
642 -> [decl] -- Sorted into canonical order
643 -> (OccEnv [decl], -- Non-orphan decls associated with their key;
644 -- each sublist in canonical order
645 [decl]) -- Orphan decls; in canonical order
646 mkOrphMap get_key decls
647 = foldl go (emptyOccEnv, []) decls
649 go (non_orphs, orphs) d
650 | Just occ <- get_key d
651 = (extendOccEnv_C (\ ds _ -> d:ds) non_orphs occ [d], orphs)
652 | otherwise = (non_orphs, d:orphs)
654 anyNothing :: (a -> Maybe b) -> [a] -> Bool
655 anyNothing p [] = False
656 anyNothing p (x:xs) = isNothing (p x) || anyNothing p xs
658 ----------------------
659 mkIfaceDeprec :: Deprecations -> IfaceDeprecs
660 mkIfaceDeprec NoDeprecs = NoDeprecs
661 mkIfaceDeprec (DeprecAll t) = DeprecAll t
662 mkIfaceDeprec (DeprecSome env) = DeprecSome (sortLe (<=) (nameEnvElts env))
664 ----------------------
665 bump_unless :: Bool -> Version -> Version
666 bump_unless True v = v -- True <=> no change
667 bump_unless False v = bumpVersion v
671 %*********************************************************
673 \subsection{Keeping track of what we've slurped, and version numbers}
675 %*********************************************************
679 mkUsageInfo :: HscEnv
680 -> ModuleEnv (Module, Bool, SrcSpan)
681 -> [(ModuleName, IsBootInterface)]
682 -> NameSet -> IO [Usage]
683 mkUsageInfo hsc_env dir_imp_mods dep_mods used_names
684 = do { eps <- hscEPS hsc_env
685 ; let usages = mk_usage_info (eps_PIT eps) hsc_env
686 dir_imp_mods dep_mods used_names
687 ; usages `seqList` return usages }
688 -- seq the list of Usages returned: occasionally these
689 -- don't get evaluated for a while and we can end up hanging on to
690 -- the entire collection of Ifaces.
692 mk_usage_info pit hsc_env dir_imp_mods dep_mods used_names
693 = mapCatMaybes mkUsage dep_mods
694 -- ToDo: do we need to sort into canonical order?
696 hpt = hsc_HPT hsc_env
697 dflags = hsc_dflags hsc_env
699 -- ent_map groups together all the things imported and used
700 -- from a particular module in this package
701 ent_map :: ModuleEnv [OccName]
702 ent_map = foldNameSet add_mv emptyModuleEnv used_names
704 | isWiredInName name = mv_map -- ignore wired-in names
706 = case nameModule_maybe name of
707 Nothing -> mv_map -- ignore internal names
708 Just mod -> extendModuleEnv_C add_item mv_map mod [occ]
710 occ = nameOccName name
711 add_item occs _ = occ:occs
713 depend_on_exports mod = case lookupModuleEnv dir_imp_mods mod of
714 Just (_,no_imp,_) -> not no_imp
717 -- We want to create a Usage for a home module if
718 -- a) we used something from; has something in used_names
719 -- b) we imported all of it, even if we used nothing from it
720 -- (need to recompile if its export list changes: export_vers)
721 -- c) is a home-package orphan or family-instance module (need to
722 -- recompile if its instance decls change: rules_vers)
723 mkUsage :: (ModuleName, IsBootInterface) -> Maybe Usage
724 mkUsage (mod_name, _)
725 | isNothing maybe_iface -- We can't depend on it if we didn't
726 || (null used_occs -- load its interface.
727 && isNothing export_vers
730 = Nothing -- Record no usage info
733 = Just (Usage { usg_name = mod_name,
735 usg_exports = export_vers,
736 usg_entities = fmToList ent_vers,
737 usg_rules = rules_vers })
739 maybe_iface = lookupIfaceByModule dflags hpt pit mod
740 -- In one-shot mode, the interfaces for home-package
741 -- modules accumulate in the PIT not HPT. Sigh.
743 mod = mkModule (thisPackage dflags) mod_name
745 Just iface = maybe_iface
746 orphan_mod = mi_orphan iface
747 finsts_mod = mi_finsts iface
748 version_env = mi_ver_fn iface
749 mod_vers = mi_mod_vers iface
750 rules_vers = mi_rule_vers iface
751 export_vers | depend_on_exports mod = Just (mi_exp_vers iface)
752 | otherwise = Nothing
754 used_occs = lookupModuleEnv ent_map mod `orElse` []
756 -- Making a FiniteMap here ensures that (a) we remove duplicates
757 -- when we have usages on several subordinates of a single parent,
758 -- and (b) that the usages emerge in a canonical order, which
759 -- is why we use FiniteMap rather than OccEnv: FiniteMap works
760 -- using Ord on the OccNames, which is a lexicographic ordering.
761 ent_vers :: FiniteMap OccName Version
762 ent_vers = listToFM (map lookup_occ used_occs)
765 case version_env occ of
766 Nothing -> pprTrace "hmm, strange" (ppr mod <+> ppr occ) $
767 (occ, initialVersion) -- does this ever happen?
768 Just (parent, version) -> (parent, version)
772 mkIfaceExports :: [AvailInfo]
773 -> [(Module, [GenAvailInfo OccName])]
774 -- Group by module and sort by occurrence
775 -- This keeps the list in canonical order
776 mkIfaceExports exports
777 = [ (mod, eltsFM avails)
778 | (mod, avails) <- fmToList groupFM
781 -- Deliberately use FiniteMap rather than UniqFM so we
782 -- get a canonical ordering
783 groupFM :: ModuleEnv (FiniteMap FastString (GenAvailInfo OccName))
784 groupFM = foldl add emptyModuleEnv exports
787 = extendModuleEnv_C add_avail env mod (unitFM avail_fs avail_occ)
789 avail_occ = availToOccs avail
790 mod = nameModule (availName avail)
791 avail_fs = occNameFS (availName avail_occ)
792 add_avail avail_fm _ = addToFM avail_fm avail_fs avail_occ
794 availToOccs (Avail n) = Avail (nameOccName n)
795 availToOccs (AvailTC tc ns) = AvailTC (nameOccName tc) (map nameOccName ns)
799 %************************************************************************
801 Load the old interface file for this module (unless
802 we have it aleady), and check whether it is up to date
805 %************************************************************************
808 checkOldIface :: HscEnv
810 -> Bool -- Source unchanged
811 -> Maybe ModIface -- Old interface from compilation manager, if any
812 -> IO (RecompileRequired, Maybe ModIface)
814 checkOldIface hsc_env mod_summary source_unchanged maybe_iface
815 = do { showPass (hsc_dflags hsc_env)
816 ("Checking old interface for " ++
817 showSDoc (ppr (ms_mod mod_summary))) ;
819 ; initIfaceCheck hsc_env $
820 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
823 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
824 = do -- CHECK WHETHER THE SOURCE HAS CHANGED
825 { ifM (not source_unchanged)
826 (traceHiDiffs (nest 4 (text "Source file changed or recompilation check turned off")))
828 -- If the source has changed and we're in interactive mode, avoid reading
829 -- an interface; just return the one we might have been supplied with.
830 ; ghc_mode <- getGhcMode
831 ; if (ghc_mode == Interactive || ghc_mode == JustTypecheck)
832 && not source_unchanged then
833 return (outOfDate, maybe_iface)
835 case maybe_iface of {
836 Just old_iface -> do -- Use the one we already have
837 { traceIf (text "We already have the old interface for" <+> ppr (ms_mod mod_summary))
838 ; recomp <- checkVersions hsc_env source_unchanged old_iface
839 ; return (recomp, Just old_iface) }
843 -- Try and read the old interface for the current module
844 -- from the .hi file left from the last time we compiled it
845 { let iface_path = msHiFilePath mod_summary
846 ; read_result <- readIface (ms_mod mod_summary) iface_path False
847 ; case read_result of {
848 Failed err -> do -- Old interface file not found, or garbled; give up
849 { traceIf (text "FYI: cannot read old interface file:"
851 ; return (outOfDate, Nothing) }
853 ; Succeeded iface -> do
855 -- We have got the old iface; check its versions
856 { traceIf (text "Read the interface file" <+> text iface_path)
857 ; recomp <- checkVersions hsc_env source_unchanged iface
858 ; returnM (recomp, Just iface)
862 @recompileRequired@ is called from the HscMain. It checks whether
863 a recompilation is required. It needs access to the persistent state,
864 finder, etc, because it may have to load lots of interface files to
865 check their versions.
868 type RecompileRequired = Bool
869 upToDate = False -- Recompile not required
870 outOfDate = True -- Recompile required
872 checkVersions :: HscEnv
873 -> Bool -- True <=> source unchanged
874 -> ModIface -- Old interface
875 -> IfG RecompileRequired
876 checkVersions hsc_env source_unchanged iface
877 | not source_unchanged
880 = do { traceHiDiffs (text "Considering whether compilation is required for" <+>
881 ppr (mi_module iface) <> colon)
883 -- Source code unchanged and no errors yet... carry on
885 -- First put the dependent-module info, read from the old interface, into the envt,
886 -- so that when we look for interfaces we look for the right one (.hi or .hi-boot)
888 -- It's just temporary because either the usage check will succeed
889 -- (in which case we are done with this module) or it'll fail (in which
890 -- case we'll compile the module from scratch anyhow).
892 -- We do this regardless of compilation mode, although in --make mode
893 -- all the dependent modules should be in the HPT already, so it's
895 ; updateEps_ $ \eps -> eps { eps_is_boot = mod_deps }
897 ; let this_pkg = thisPackage (hsc_dflags hsc_env)
898 ; checkList [checkModUsage this_pkg u | u <- mi_usages iface]
901 -- This is a bit of a hack really
902 mod_deps :: ModuleNameEnv (ModuleName, IsBootInterface)
903 mod_deps = mkModDeps (dep_mods (mi_deps iface))
905 checkModUsage :: PackageId ->Usage -> IfG RecompileRequired
906 -- Given the usage information extracted from the old
907 -- M.hi file for the module being compiled, figure out
908 -- whether M needs to be recompiled.
910 checkModUsage this_pkg (Usage { usg_name = mod_name, usg_mod = old_mod_vers,
911 usg_rules = old_rule_vers,
912 usg_exports = maybe_old_export_vers,
913 usg_entities = old_decl_vers })
914 = -- Load the imported interface is possible
916 doc_str = sep [ptext SLIT("need version info for"), ppr mod_name]
918 traceHiDiffs (text "Checking usages for module" <+> ppr mod_name) `thenM_`
921 mod = mkModule this_pkg mod_name
923 loadInterface doc_str mod ImportBySystem `thenM` \ mb_iface ->
924 -- Load the interface, but don't complain on failure;
925 -- Instead, get an Either back which we can test
928 Failed exn -> (out_of_date (sep [ptext SLIT("Can't find version number for module"),
930 -- Couldn't find or parse a module mentioned in the
931 -- old interface file. Don't complain -- it might just be that
932 -- the current module doesn't need that import and it's been deleted
936 new_mod_vers = mi_mod_vers iface
937 new_decl_vers = mi_ver_fn iface
938 new_export_vers = mi_exp_vers iface
939 new_rule_vers = mi_rule_vers iface
942 checkModuleVersion old_mod_vers new_mod_vers `thenM` \ recompile ->
943 if not recompile then
948 if checkExportList maybe_old_export_vers new_export_vers then
949 out_of_date_vers (ptext SLIT(" Export list changed"))
950 (expectJust "checkModUsage" maybe_old_export_vers)
955 if old_rule_vers /= new_rule_vers then
956 out_of_date_vers (ptext SLIT(" Rules changed"))
957 old_rule_vers new_rule_vers
960 -- CHECK ITEMS ONE BY ONE
961 checkList [checkEntityUsage new_decl_vers u | u <- old_decl_vers] `thenM` \ recompile ->
963 returnM outOfDate -- This one failed, so just bail out now
965 up_to_date (ptext SLIT(" Great! The bits I use are up to date"))
968 ------------------------
969 checkModuleVersion old_mod_vers new_mod_vers
970 | new_mod_vers == old_mod_vers
971 = up_to_date (ptext SLIT("Module version unchanged"))
974 = out_of_date_vers (ptext SLIT(" Module version has changed"))
975 old_mod_vers new_mod_vers
977 ------------------------
978 checkExportList Nothing new_vers = upToDate
979 checkExportList (Just v) new_vers = v /= new_vers
981 ------------------------
982 checkEntityUsage new_vers (name,old_vers)
983 = case new_vers name of
985 Nothing -> -- We used it before, but it ain't there now
986 out_of_date (sep [ptext SLIT("No longer exported:"), ppr name])
988 Just (_, new_vers) -- It's there, but is it up to date?
989 | new_vers == old_vers -> traceHiDiffs (text " Up to date" <+> ppr name <+> parens (ppr new_vers)) `thenM_`
991 | otherwise -> out_of_date_vers (ptext SLIT(" Out of date:") <+> ppr name)
994 up_to_date msg = traceHiDiffs msg `thenM_` returnM upToDate
995 out_of_date msg = traceHiDiffs msg `thenM_` returnM outOfDate
996 out_of_date_vers msg old_vers new_vers
997 = out_of_date (hsep [msg, ppr old_vers, ptext SLIT("->"), ppr new_vers])
999 ----------------------
1000 checkList :: [IfG RecompileRequired] -> IfG RecompileRequired
1001 -- This helper is used in two places
1002 checkList [] = returnM upToDate
1003 checkList (check:checks) = check `thenM` \ recompile ->
1010 %************************************************************************
1012 Converting things to their Iface equivalents
1014 %************************************************************************
1017 tyThingToIfaceDecl :: TyThing -> IfaceDecl
1018 -- Assumption: the thing is already tidied, so that locally-bound names
1019 -- (lambdas, for-alls) already have non-clashing OccNames
1020 -- Reason: Iface stuff uses OccNames, and the conversion here does
1021 -- not do tidying on the way
1022 tyThingToIfaceDecl (AnId id)
1023 = IfaceId { ifName = getOccName id,
1024 ifType = toIfaceType (idType id),
1027 info = case toIfaceIdInfo (idInfo id) of
1029 items -> HasInfo items
1031 tyThingToIfaceDecl (AClass clas)
1032 = IfaceClass { ifCtxt = toIfaceContext sc_theta,
1033 ifName = getOccName clas,
1034 ifTyVars = toIfaceTvBndrs clas_tyvars,
1035 ifFDs = map toIfaceFD clas_fds,
1036 ifATs = map (tyThingToIfaceDecl . ATyCon) clas_ats,
1037 ifSigs = map toIfaceClassOp op_stuff,
1038 ifRec = boolToRecFlag (isRecursiveTyCon tycon) }
1040 (clas_tyvars, clas_fds, sc_theta, _, clas_ats, op_stuff)
1041 = classExtraBigSig clas
1042 tycon = classTyCon clas
1044 toIfaceClassOp (sel_id, def_meth)
1045 = ASSERT(sel_tyvars == clas_tyvars)
1046 IfaceClassOp (getOccName sel_id) def_meth (toIfaceType op_ty)
1048 -- Be careful when splitting the type, because of things
1049 -- like class Foo a where
1050 -- op :: (?x :: String) => a -> a
1051 -- and class Baz a where
1052 -- op :: (Ord a) => a -> a
1053 (sel_tyvars, rho_ty) = splitForAllTys (idType sel_id)
1054 op_ty = funResultTy rho_ty
1056 toIfaceFD (tvs1, tvs2) = (map getFS tvs1, map getFS tvs2)
1058 tyThingToIfaceDecl (ATyCon tycon)
1060 = IfaceSyn { ifName = getOccName tycon,
1061 ifTyVars = toIfaceTvBndrs tyvars,
1062 ifOpenSyn = syn_isOpen,
1063 ifSynRhs = toIfaceType syn_tyki }
1066 = IfaceData { ifName = getOccName tycon,
1067 ifTyVars = toIfaceTvBndrs tyvars,
1068 ifCtxt = toIfaceContext (tyConStupidTheta tycon),
1069 ifCons = ifaceConDecls (algTyConRhs tycon),
1070 ifRec = boolToRecFlag (isRecursiveTyCon tycon),
1071 ifGadtSyntax = isGadtSyntaxTyCon tycon,
1072 ifGeneric = tyConHasGenerics tycon,
1073 ifFamInst = famInstToIface (tyConFamInst_maybe tycon)}
1075 | isForeignTyCon tycon
1076 = IfaceForeign { ifName = getOccName tycon,
1077 ifExtName = tyConExtName tycon }
1079 | otherwise = pprPanic "toIfaceDecl" (ppr tycon)
1081 tyvars = tyConTyVars tycon
1082 (syn_isOpen, syn_tyki) = case synTyConRhs tycon of
1083 OpenSynTyCon ki -> (True , ki)
1084 SynonymTyCon ty -> (False, ty)
1086 ifaceConDecls (NewTyCon { data_con = con }) =
1087 IfNewTyCon (ifaceConDecl con)
1088 ifaceConDecls (DataTyCon { data_cons = cons }) =
1089 IfDataTyCon (map ifaceConDecl cons)
1090 ifaceConDecls OpenDataTyCon = IfOpenDataTyCon
1091 ifaceConDecls OpenNewTyCon = IfOpenNewTyCon
1092 ifaceConDecls AbstractTyCon = IfAbstractTyCon
1093 -- The last case happens when a TyCon has been trimmed during tidying
1094 -- Furthermore, tyThingToIfaceDecl is also used
1095 -- in TcRnDriver for GHCi, when browsing a module, in which case the
1096 -- AbstractTyCon case is perfectly sensible.
1098 ifaceConDecl data_con
1099 = IfCon { ifConOcc = getOccName (dataConName data_con),
1100 ifConInfix = dataConIsInfix data_con,
1101 ifConUnivTvs = toIfaceTvBndrs (dataConUnivTyVars data_con),
1102 ifConExTvs = toIfaceTvBndrs (dataConExTyVars data_con),
1103 ifConEqSpec = to_eq_spec (dataConEqSpec data_con),
1104 ifConCtxt = toIfaceContext (dataConTheta data_con),
1105 ifConArgTys = map toIfaceType (dataConOrigArgTys data_con),
1106 ifConFields = map getOccName
1107 (dataConFieldLabels data_con),
1108 ifConStricts = dataConStrictMarks data_con }
1110 to_eq_spec spec = [(getOccName tv, toIfaceType ty) | (tv,ty) <- spec]
1112 famInstToIface Nothing = Nothing
1113 famInstToIface (Just (famTyCon, instTys)) =
1114 Just (toIfaceTyCon famTyCon, map toIfaceType instTys)
1116 tyThingToIfaceDecl (ADataCon dc)
1117 = pprPanic "toIfaceDecl" (ppr dc) -- Should be trimmed out earlier
1120 getFS x = occNameFS (getOccName x)
1122 --------------------------
1123 instanceToIfaceInst :: Instance -> IfaceInst
1124 instanceToIfaceInst ispec@(Instance { is_dfun = dfun_id, is_flag = oflag,
1125 is_cls = cls, is_tcs = mb_tcs,
1127 = IfaceInst { ifDFun = getName dfun_id,
1130 ifInstTys = map do_rough mb_tcs,
1133 do_rough Nothing = Nothing
1134 do_rough (Just n) = Just (toIfaceTyCon_name n)
1136 --------------------------
1137 famInstToIfaceFamInst :: FamInst -> IfaceFamInst
1138 famInstToIfaceFamInst fi@(FamInst { fi_tycon = tycon,
1139 fi_fam = fam, fi_tcs = mb_tcs })
1140 = IfaceFamInst { ifFamInstTyCon = toIfaceTyCon tycon
1141 , ifFamInstFam = fam
1142 , ifFamInstTys = map do_rough mb_tcs }
1144 do_rough Nothing = Nothing
1145 do_rough (Just n) = Just (toIfaceTyCon_name n)
1147 --------------------------
1148 toIfaceIdInfo :: IdInfo -> [IfaceInfoItem]
1149 toIfaceIdInfo id_info
1150 = catMaybes [arity_hsinfo, caf_hsinfo, strict_hsinfo,
1151 inline_hsinfo, wrkr_hsinfo, unfold_hsinfo]
1153 ------------ Arity --------------
1154 arity_info = arityInfo id_info
1155 arity_hsinfo | arity_info == 0 = Nothing
1156 | otherwise = Just (HsArity arity_info)
1158 ------------ Caf Info --------------
1159 caf_info = cafInfo id_info
1160 caf_hsinfo = case caf_info of
1161 NoCafRefs -> Just HsNoCafRefs
1164 ------------ Strictness --------------
1165 -- No point in explicitly exporting TopSig
1166 strict_hsinfo = case newStrictnessInfo id_info of
1167 Just sig | not (isTopSig sig) -> Just (HsStrictness sig)
1170 ------------ Worker --------------
1171 work_info = workerInfo id_info
1172 has_worker = case work_info of { HasWorker _ _ -> True; other -> False }
1173 wrkr_hsinfo = case work_info of
1174 HasWorker work_id wrap_arity ->
1175 Just (HsWorker ((idName work_id)) wrap_arity)
1178 ------------ Unfolding --------------
1179 -- The unfolding is redundant if there is a worker
1180 unfold_info = unfoldingInfo id_info
1181 rhs = unfoldingTemplate unfold_info
1182 no_unfolding = neverUnfold unfold_info
1183 -- The CoreTidy phase retains unfolding info iff
1184 -- we want to expose the unfolding, taking into account
1185 -- unconditional NOINLINE, etc. See TidyPgm.addExternal
1186 unfold_hsinfo | no_unfolding = Nothing
1187 | has_worker = Nothing -- Unfolding is implicit
1188 | otherwise = Just (HsUnfold (toIfaceExpr rhs))
1190 ------------ Inline prag --------------
1191 inline_prag = inlinePragInfo id_info
1192 inline_hsinfo | isAlwaysActive inline_prag = Nothing
1193 | no_unfolding && not has_worker = Nothing
1194 -- If the iface file give no unfolding info, we
1195 -- don't need to say when inlining is OK!
1196 | otherwise = Just (HsInline inline_prag)
1198 --------------------------
1199 coreRuleToIfaceRule :: CoreRule -> IfaceRule
1200 coreRuleToIfaceRule (BuiltinRule { ru_fn = fn})
1201 = pprTrace "toHsRule: builtin" (ppr fn) $
1204 coreRuleToIfaceRule (Rule { ru_name = name, ru_fn = fn,
1205 ru_act = act, ru_bndrs = bndrs,
1206 ru_args = args, ru_rhs = rhs, ru_orph = orph })
1207 = IfaceRule { ifRuleName = name, ifActivation = act,
1208 ifRuleBndrs = map toIfaceBndr bndrs,
1210 ifRuleArgs = map do_arg args,
1211 ifRuleRhs = toIfaceExpr rhs,
1214 -- For type args we must remove synonyms from the outermost
1215 -- level. Reason: so that when we read it back in we'll
1216 -- construct the same ru_rough field as we have right now;
1218 do_arg (Type ty) = IfaceType (toIfaceType (deNoteType ty))
1219 do_arg arg = toIfaceExpr arg
1221 bogusIfaceRule :: Name -> IfaceRule
1222 bogusIfaceRule id_name
1223 = IfaceRule { ifRuleName = FSLIT("bogus"), ifActivation = NeverActive,
1224 ifRuleBndrs = [], ifRuleHead = id_name, ifRuleArgs = [],
1225 ifRuleRhs = IfaceExt id_name, ifRuleOrph = Nothing }
1227 ---------------------
1228 toIfaceExpr :: CoreExpr -> IfaceExpr
1229 toIfaceExpr (Var v) = toIfaceVar v
1230 toIfaceExpr (Lit l) = IfaceLit l
1231 toIfaceExpr (Type ty) = IfaceType (toIfaceType ty)
1232 toIfaceExpr (Lam x b) = IfaceLam (toIfaceBndr x) (toIfaceExpr b)
1233 toIfaceExpr (App f a) = toIfaceApp f [a]
1234 toIfaceExpr (Case s x ty as) = IfaceCase (toIfaceExpr s) (getFS x) (toIfaceType ty) (map toIfaceAlt as)
1235 toIfaceExpr (Let b e) = IfaceLet (toIfaceBind b) (toIfaceExpr e)
1236 toIfaceExpr (Cast e co) = IfaceCast (toIfaceExpr e) (toIfaceType co)
1237 toIfaceExpr (Note n e) = IfaceNote (toIfaceNote n) (toIfaceExpr e)
1239 ---------------------
1240 toIfaceNote (SCC cc) = IfaceSCC cc
1241 toIfaceNote InlineMe = IfaceInlineMe
1242 toIfaceNote (CoreNote s) = IfaceCoreNote s
1244 ---------------------
1245 toIfaceBind (NonRec b r) = IfaceNonRec (toIfaceIdBndr b) (toIfaceExpr r)
1246 toIfaceBind (Rec prs) = IfaceRec [(toIfaceIdBndr b, toIfaceExpr r) | (b,r) <- prs]
1248 ---------------------
1249 toIfaceAlt (c,bs,r) = (toIfaceCon c, map getFS bs, toIfaceExpr r)
1251 ---------------------
1252 toIfaceCon (DataAlt dc) | isTupleTyCon tc = IfaceTupleAlt (tupleTyConBoxity tc)
1253 | otherwise = IfaceDataAlt (getName dc)
1255 tc = dataConTyCon dc
1257 toIfaceCon (LitAlt l) = IfaceLitAlt l
1258 toIfaceCon DEFAULT = IfaceDefault
1260 ---------------------
1261 toIfaceApp (App f a) as = toIfaceApp f (a:as)
1262 toIfaceApp (Var v) as
1263 = case isDataConWorkId_maybe v of
1264 -- We convert the *worker* for tuples into IfaceTuples
1265 Just dc | isTupleTyCon tc && saturated
1266 -> IfaceTuple (tupleTyConBoxity tc) tup_args
1268 val_args = dropWhile isTypeArg as
1269 saturated = val_args `lengthIs` idArity v
1270 tup_args = map toIfaceExpr val_args
1271 tc = dataConTyCon dc
1273 other -> mkIfaceApps (toIfaceVar v) as
1275 toIfaceApp e as = mkIfaceApps (toIfaceExpr e) as
1277 mkIfaceApps f as = foldl (\f a -> IfaceApp f (toIfaceExpr a)) f as
1279 ---------------------
1280 toIfaceVar :: Id -> IfaceExpr
1282 | Just fcall <- isFCallId_maybe v = IfaceFCall fcall (toIfaceType (idType v))
1283 -- Foreign calls have special syntax
1284 | isExternalName name = IfaceExt name
1285 | otherwise = IfaceLcl (getFS name)