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_decls = deliberatelyOmitted "decls",
293 mi_ver_fn = deliberatelyOmitted "ver_fn",
295 -- And build the cached values
296 mi_dep_fn = mkIfaceDepCache deprecs,
297 mi_fix_fn = mkIfaceFixCache fixities }
299 -- Add version information
300 ; ext_ver_fn = mkParentVerFun hsc_env eps
301 ; (new_iface, no_change_at_all, pp_diffs, pp_orphs)
302 = _scc_ "versioninfo"
303 addVersionInfo ext_ver_fn maybe_old_iface
304 intermediate_iface decls
308 ; when (isJust pp_orphs && dopt Opt_WarnOrphans dflags)
309 (printDump (expectJust "mkIface" pp_orphs))
310 ; when (dopt Opt_D_dump_hi_diffs dflags) (printDump pp_diffs)
311 ; dumpIfSet_dyn dflags Opt_D_dump_hi "FINAL INTERFACE"
312 (pprModIface new_iface)
314 ; return (new_iface, no_change_at_all) }
316 r1 `le_rule` r2 = ifRuleName r1 <= ifRuleName r2
317 i1 `le_inst` i2 = ifDFun i1 <= ifDFun i2
318 i1 `le_fam_inst` i2 = ifFamInstTyConOcc i1 <= ifFamInstTyConOcc i2
320 dflags = hsc_dflags hsc_env
321 deliberatelyOmitted x = panic ("Deliberately omitted: " ++ x)
322 ifFamInstTyConOcc = nameOccName . ifaceTyConName . ifFamInstTyCon
325 -----------------------------
326 writeIfaceFile :: DynFlags -> ModLocation -> ModIface -> IO ()
327 writeIfaceFile dflags location new_iface
328 = do createDirectoryHierarchy (directoryOf hi_file_path)
329 writeBinIface dflags hi_file_path new_iface
330 where hi_file_path = ml_hi_file location
333 -- -----------------------------------------------------------------------------
334 -- Look up parents and versions of Names
336 -- This is like a global version of the mi_ver_fn field in each ModIface.
337 -- Given a Name, it finds the ModIface, and then uses mi_ver_fn to get
338 -- the parent and version info.
341 :: HscEnv -- needed to look up versions
342 -> ExternalPackageState -- ditto
343 -> (Name -> (OccName,Version))
344 mkParentVerFun hsc_env eps
347 mod = nameModule name
348 occ = nameOccName name
349 iface = lookupIfaceByModule (hsc_dflags hsc_env) hpt pit mod `orElse`
350 pprPanic "lookupVers2" (ppr mod <+> ppr occ)
352 mi_ver_fn iface occ `orElse`
353 pprPanic "lookupVers1" (ppr mod <+> ppr occ)
355 hpt = hsc_HPT hsc_env
358 -----------------------------------------------------------------------------
359 -- Compute version numbers for local decls
362 :: (Name -> (OccName,Version)) -- lookup parents and versions of names
363 -> Maybe ModIface -- The old interface, read from M.hi
364 -> ModIface -- The new interface (lacking decls)
365 -> [IfaceDecl] -- The new decls
366 -> (ModIface, -- Updated interface
367 Bool, -- True <=> no changes at all; no need to write Iface
369 Maybe SDoc) -- Warnings about orphans
371 addVersionInfo ver_fn Nothing new_iface new_decls
372 -- No old interface, so definitely write a new one!
373 = (new_iface { mi_orphan = anyNothing ifInstOrph (mi_insts new_iface)
374 || anyNothing ifRuleOrph (mi_rules new_iface),
375 mi_decls = [(initialVersion, decl) | decl <- new_decls],
376 mi_ver_fn = mkIfaceVerCache (zip (repeat initialVersion) new_decls)},
378 ptext SLIT("No old interface file"),
379 pprOrphans orph_insts orph_rules)
381 orph_insts = filter (isNothing . ifInstOrph) (mi_insts new_iface)
382 orph_rules = filter (isNothing . ifRuleOrph) (mi_rules new_iface)
384 addVersionInfo ver_fn (Just old_iface@(ModIface {
385 mi_mod_vers = old_mod_vers,
386 mi_exp_vers = old_exp_vers,
387 mi_rule_vers = old_rule_vers,
388 mi_decls = old_decls,
389 mi_ver_fn = old_decl_vers,
390 mi_fix_fn = old_fixities }))
391 new_iface@(ModIface { mi_fix_fn = new_fixities })
394 = (old_iface, True, ptext SLIT("Interface file unchanged"), pp_orphs)
396 = (final_iface, False, vcat [ptext SLIT("Interface file has changed"),
397 nest 2 pp_diffs], pp_orphs)
399 final_iface = new_iface {
400 mi_mod_vers = bump_unless no_output_change old_mod_vers,
401 mi_exp_vers = bump_unless no_export_change old_exp_vers,
402 mi_rule_vers = bump_unless no_rule_change old_rule_vers,
403 mi_orphan = not (null new_orph_rules && null new_orph_insts),
404 mi_decls = decls_w_vers,
405 mi_ver_fn = mkIfaceVerCache decls_w_vers }
407 decls_w_vers = [(add_vers decl, decl) | decl <- new_decls]
410 (old_non_orph_insts, old_orph_insts) =
411 mkOrphMap ifInstOrph (mi_insts old_iface)
412 (new_non_orph_insts, new_orph_insts) =
413 mkOrphMap ifInstOrph (mi_insts new_iface)
414 same_insts occ = eqMaybeBy (eqListBy eqIfInst)
415 (lookupOccEnv old_non_orph_insts occ)
416 (lookupOccEnv new_non_orph_insts occ)
418 (old_non_orph_rules, old_orph_rules) =
419 mkOrphMap ifRuleOrph (mi_rules old_iface)
420 (new_non_orph_rules, new_orph_rules) =
421 mkOrphMap ifRuleOrph (mi_rules new_iface)
422 same_rules occ = eqMaybeBy (eqListBy eqIfRule)
423 (lookupOccEnv old_non_orph_rules occ)
424 (lookupOccEnv new_non_orph_rules occ)
426 -- Computing what changed
427 no_output_change = no_decl_change && no_rule_change &&
428 no_export_change && no_deprec_change
429 no_export_change = mi_exports new_iface == mi_exports old_iface
431 no_decl_change = isEmptyOccSet changed_occs
432 no_rule_change = not (changedWrtNames changed_occs (eqListBy eqIfRule old_orph_rules new_orph_rules)
433 || changedWrtNames changed_occs (eqListBy eqIfInst old_orph_insts new_orph_insts))
434 no_deprec_change = mi_deprecs new_iface == mi_deprecs old_iface
436 -- If the usages havn't changed either, we don't need to write the interface file
437 no_other_changes = mi_usages new_iface == mi_usages old_iface &&
438 mi_deps new_iface == mi_deps old_iface
439 no_change_at_all = no_output_change && no_other_changes
441 pp_diffs = vcat [pp_change no_export_change "Export list"
442 (ppr old_exp_vers <+> arrow <+> ppr (mi_exp_vers final_iface)),
443 pp_change no_rule_change "Rules"
444 (ppr old_rule_vers <+> arrow <+> ppr (mi_rule_vers final_iface)),
445 pp_change no_deprec_change "Deprecations" empty,
446 pp_change no_other_changes "Usages" empty,
448 pp_change True what info = empty
449 pp_change False what info = text what <+> ptext SLIT("changed") <+> info
452 old_decl_env = mkOccEnv [(ifName decl, decl) | (_,decl) <- old_decls]
453 same_fixity n = bool (old_fixities n == new_fixities n)
456 -- Adding version info
457 new_version = bumpVersion old_mod_vers
458 -- Start from the old module version, not from
459 -- zero so that if you remove f, and then add
460 -- it again, you don't thereby reduce f's
463 add_vers decl | occ `elemOccSet` changed_occs = new_version
464 | otherwise = snd (expectJust "add_vers" (old_decl_vers occ))
465 -- If it's unchanged, there jolly well
466 where -- should be an old version number
470 -- Deciding which declarations have changed
472 -- For each local decl, the IfaceEq gives the list of things that
473 -- must be unchanged for the declaration as a whole to be unchanged.
474 eq_info :: [(OccName, IfaceEq)]
475 eq_info = map check_eq new_decls
477 | Just old_decl <- lookupOccEnv old_decl_env occ
478 = (occ, new_decl `eqIfDecl` old_decl &&& eq_indirects new_decl)
479 | otherwise {- No corresponding old decl -}
482 occ = ifName new_decl
484 eq_indirects :: IfaceDecl -> IfaceEq
485 -- When seeing if two decls are the same, remember to
486 -- check whether any relevant fixity or rules have changed
487 eq_indirects (IfaceId {ifName = occ}) = eq_ind_occ occ
488 eq_indirects (IfaceClass {ifName = cls_occ, ifSigs = sigs})
489 = same_insts cls_occ &&&
490 eq_ind_occs [op | IfaceClassOp op _ _ <- sigs]
491 eq_indirects (IfaceData {ifName = tc_occ, ifCons = cons})
492 = same_insts tc_occ &&& same_fixity tc_occ &&& -- The TyCon can have a fixity too
493 eq_ind_occs (map ifConOcc (visibleIfConDecls cons))
494 eq_indirects other = Equal -- Synonyms and foreign declarations
496 eq_ind_occ :: OccName -> IfaceEq -- For class ops and Ids; check fixity and rules
497 eq_ind_occ occ = same_fixity occ &&& same_rules occ
498 eq_ind_occs = foldr ((&&&) . eq_ind_occ) Equal
500 -- The Occs of declarations that changed.
501 changed_occs :: OccSet
502 changed_occs = computeChangedOccs ver_fn (mi_module new_iface)
503 (mi_usages old_iface) eq_info
507 pp_decl_diffs :: SDoc -- Nothing => no changes
509 | isEmptyOccSet changed_occs = empty
511 = vcat [ptext SLIT("Changed occs:") <+> ppr (occSetElts changed_occs),
512 ptext SLIT("Version change for these decls:"),
513 nest 2 (vcat (map show_change new_decls))]
515 eq_env = mkOccEnv eq_info
517 | not (occ `elemOccSet` changed_occs) = empty
519 = vcat [ppr occ <+> ppr (old_decl_vers occ) <+> arrow <+> ppr new_version,
522 occ = ifName new_decl
523 why = case lookupOccEnv eq_env occ of
524 Just (EqBut names) -> sep [ppr occ <> colon, ptext SLIT("Free vars (only) changed:"),
525 nest 2 (braces (fsep (map ppr (occSetElts
526 (occs `intersectOccSet` changed_occs)))))]
527 where occs = mkOccSet (map nameOccName (nameSetToList names))
529 | Just old_decl <- lookupOccEnv old_decl_env occ
530 -> vcat [ptext SLIT("Old:") <+> ppr old_decl,
531 ptext SLIT("New:") <+> ppr new_decl]
533 -> ppr occ <+> ptext SLIT("only in new interface")
534 other -> pprPanic "MkIface.show_change" (ppr occ)
536 pp_orphs = pprOrphans new_orph_insts new_orph_rules
539 pprOrphans insts rules
540 | null insts && null rules = Nothing
543 if null insts then empty else
544 hang (ptext SLIT("Warning: orphan instances:"))
545 2 (vcat (map ppr insts)),
546 if null rules then empty else
547 hang (ptext SLIT("Warning: orphan rules:"))
548 2 (vcat (map ppr rules))
552 :: (Name -> (OccName,Version)) -- get parents and versions
553 -> Module -- This module
554 -> [Usage] -- Usages from old iface
555 -> [(OccName, IfaceEq)] -- decl names, equality conditions
556 -> OccSet -- set of things that have changed
557 computeChangedOccs ver_fn this_module old_usages eq_info
558 = foldl add_changes emptyOccSet (stronglyConnComp edges)
561 -- return True if an external name has changed
562 name_changed :: Name -> Bool
564 | Just ents <- lookupUFM usg_modmap (moduleName mod)
565 = case lookupUFM ents parent_occ of
566 Nothing -> pprPanic "computeChangedOccs" (ppr nm)
567 Just v -> v < new_version
568 | otherwise = False -- must be in another package
571 (parent_occ, new_version) = ver_fn nm
573 -- Turn the usages from the old ModIface into a mapping
574 usg_modmap = listToUFM [ (usg_mod usg, listToUFM (usg_entities usg))
575 | usg <- old_usages ]
577 get_local_eq_info :: GenIfaceEq NameSet -> GenIfaceEq OccSet
578 get_local_eq_info Equal = Equal
579 get_local_eq_info NotEqual = NotEqual
580 get_local_eq_info (EqBut ns) = foldNameSet f Equal ns
581 where f name eq | nameModule name == this_module =
582 EqBut (unitOccSet (nameOccName name)) `and_occifeq` eq
583 | name_changed name = NotEqual
586 local_eq_infos = mapSnd get_local_eq_info eq_info
588 edges :: [((OccName, OccIfaceEq), Unique, [Unique])]
589 edges = [ (node, getUnique occ, map getUnique occs)
590 | node@(occ, iface_eq) <- local_eq_infos
591 , let occs = case iface_eq of
592 EqBut occ_set -> occSetElts occ_set
595 -- Changes in declarations
596 add_changes :: OccSet -> SCC (OccName, OccIfaceEq) -> OccSet
597 add_changes so_far (AcyclicSCC (occ, iface_eq))
598 | changedWrt so_far iface_eq -- This one has changed
599 = extendOccSet so_far occ
600 add_changes so_far (CyclicSCC pairs)
601 | changedWrt so_far (foldr1 and_occifeq iface_eqs)
602 -- One of this group has changed
603 = extendOccSetList so_far occs
604 where (occs, iface_eqs) = unzip pairs
605 add_changes so_far other = so_far
607 type OccIfaceEq = GenIfaceEq OccSet
609 changedWrt :: OccSet -> OccIfaceEq -> Bool
610 changedWrt so_far Equal = False
611 changedWrt so_far NotEqual = True
612 changedWrt so_far (EqBut kids) = so_far `intersectsOccSet` kids
614 changedWrtNames :: OccSet -> IfaceEq -> Bool
615 changedWrtNames so_far Equal = False
616 changedWrtNames so_far NotEqual = True
617 changedWrtNames so_far (EqBut kids) =
618 so_far `intersectsOccSet` mkOccSet (map nameOccName (nameSetToList kids))
620 and_occifeq :: OccIfaceEq -> OccIfaceEq -> OccIfaceEq
621 Equal `and_occifeq` x = x
622 NotEqual `and_occifeq` x = NotEqual
623 EqBut nms `and_occifeq` Equal = EqBut nms
624 EqBut nms `and_occifeq` NotEqual = NotEqual
625 EqBut nms1 `and_occifeq` EqBut nms2 = EqBut (nms1 `unionOccSets` nms2)
627 ----------------------
628 -- mkOrphMap partitions instance decls or rules into
629 -- (a) an OccEnv for ones that are not orphans,
630 -- mapping the local OccName to a list of its decls
631 -- (b) a list of orphan decls
632 mkOrphMap :: (decl -> Maybe OccName) -- (Just occ) for a non-orphan decl, keyed by occ
633 -- Nothing for an orphan decl
634 -> [decl] -- Sorted into canonical order
635 -> (OccEnv [decl], -- Non-orphan decls associated with their key;
636 -- each sublist in canonical order
637 [decl]) -- Orphan decls; in canonical order
638 mkOrphMap get_key decls
639 = foldl go (emptyOccEnv, []) decls
641 go (non_orphs, orphs) d
642 | Just occ <- get_key d
643 = (extendOccEnv_C (\ ds _ -> d:ds) non_orphs occ [d], orphs)
644 | otherwise = (non_orphs, d:orphs)
646 anyNothing :: (a -> Maybe b) -> [a] -> Bool
647 anyNothing p [] = False
648 anyNothing p (x:xs) = isNothing (p x) || anyNothing p xs
650 ----------------------
651 mkIfaceDeprec :: Deprecations -> IfaceDeprecs
652 mkIfaceDeprec NoDeprecs = NoDeprecs
653 mkIfaceDeprec (DeprecAll t) = DeprecAll t
654 mkIfaceDeprec (DeprecSome env) = DeprecSome (sortLe (<=) (nameEnvElts env))
656 ----------------------
657 bump_unless :: Bool -> Version -> Version
658 bump_unless True v = v -- True <=> no change
659 bump_unless False v = bumpVersion v
663 %*********************************************************
665 \subsection{Keeping track of what we've slurped, and version numbers}
667 %*********************************************************
671 mkUsageInfo :: HscEnv
672 -> ModuleEnv (Module, Bool, SrcSpan)
673 -> [(ModuleName, IsBootInterface)]
674 -> NameSet -> IO [Usage]
675 mkUsageInfo hsc_env dir_imp_mods dep_mods used_names
676 = do { eps <- hscEPS hsc_env
677 ; let usages = mk_usage_info (eps_PIT eps) hsc_env
678 dir_imp_mods dep_mods used_names
679 ; usages `seqList` return usages }
680 -- seq the list of Usages returned: occasionally these
681 -- don't get evaluated for a while and we can end up hanging on to
682 -- the entire collection of Ifaces.
684 mk_usage_info pit hsc_env dir_imp_mods dep_mods used_names
685 = mapCatMaybes mkUsage dep_mods
686 -- ToDo: do we need to sort into canonical order?
688 hpt = hsc_HPT hsc_env
689 dflags = hsc_dflags hsc_env
691 -- ent_map groups together all the things imported and used
692 -- from a particular module in this package
693 ent_map :: ModuleEnv [OccName]
694 ent_map = foldNameSet add_mv emptyModuleEnv used_names
696 | isWiredInName name = mv_map -- ignore wired-in names
698 = case nameModule_maybe name of
699 Nothing -> mv_map -- ignore internal names
700 Just mod -> extendModuleEnv_C add_item mv_map mod [occ]
702 occ = nameOccName name
703 add_item occs _ = occ:occs
705 depend_on_exports mod = case lookupModuleEnv dir_imp_mods mod of
706 Just (_,no_imp,_) -> not no_imp
709 -- We want to create a Usage for a home module if
710 -- a) we used something from; has something in used_names
711 -- b) we imported all of it, even if we used nothing from it
712 -- (need to recompile if its export list changes: export_vers)
713 -- c) is a home-package orphan module (need to recompile if its
714 -- instance decls change: rules_vers)
715 mkUsage :: (ModuleName, IsBootInterface) -> Maybe Usage
716 mkUsage (mod_name, _)
717 | isNothing maybe_iface -- We can't depend on it if we didn't
718 || (null used_occs -- load its interface.
719 && isNothing export_vers
721 = Nothing -- Record no usage info
724 = Just (Usage { usg_name = mod_name,
726 usg_exports = export_vers,
727 usg_entities = fmToList ent_vers,
728 usg_rules = rules_vers })
730 maybe_iface = lookupIfaceByModule dflags hpt pit mod
731 -- In one-shot mode, the interfaces for home-package
732 -- modules accumulate in the PIT not HPT. Sigh.
734 mod = mkModule (thisPackage dflags) mod_name
736 Just iface = maybe_iface
737 orphan_mod = mi_orphan iface
738 version_env = mi_ver_fn iface
739 mod_vers = mi_mod_vers iface
740 rules_vers = mi_rule_vers iface
741 export_vers | depend_on_exports mod = Just (mi_exp_vers iface)
742 | otherwise = Nothing
744 used_occs = lookupModuleEnv ent_map mod `orElse` []
746 -- Making a FiniteMap here ensures that (a) we remove duplicates
747 -- when we have usages on several subordinates of a single parent,
748 -- and (b) that the usages emerge in a canonical order, which
749 -- is why we use FiniteMap rather than OccEnv: FiniteMap works
750 -- using Ord on the OccNames, which is a lexicographic ordering.
751 ent_vers :: FiniteMap OccName Version
752 ent_vers = listToFM (map lookup_occ used_occs)
755 case version_env occ of
756 Nothing -> pprTrace "hmm, strange" (ppr mod <+> ppr occ) $
757 (occ, initialVersion) -- does this ever happen?
758 Just (parent, version) -> (parent, version)
762 mkIfaceExports :: [AvailInfo]
763 -> [(Module, [GenAvailInfo OccName])]
764 -- Group by module and sort by occurrence
765 -- This keeps the list in canonical order
766 mkIfaceExports exports
767 = [ (mod, eltsFM avails)
768 | (mod, avails) <- fmToList groupFM
771 -- Deliberately use FiniteMap rather than UniqFM so we
772 -- get a canonical ordering
773 groupFM :: ModuleEnv (FiniteMap FastString (GenAvailInfo OccName))
774 groupFM = foldl add emptyModuleEnv exports
777 = extendModuleEnv_C add_avail env mod (unitFM avail_fs avail_occ)
779 avail_occ = availToOccs avail
780 mod = nameModule (availName avail)
781 avail_fs = occNameFS (availName avail_occ)
782 add_avail avail_fm _ = addToFM avail_fm avail_fs avail_occ
784 availToOccs (Avail n) = Avail (nameOccName n)
785 availToOccs (AvailTC tc ns) = AvailTC (nameOccName tc) (map nameOccName ns)
789 %************************************************************************
791 Load the old interface file for this module (unless
792 we have it aleady), and check whether it is up to date
795 %************************************************************************
798 checkOldIface :: HscEnv
800 -> Bool -- Source unchanged
801 -> Maybe ModIface -- Old interface from compilation manager, if any
802 -> IO (RecompileRequired, Maybe ModIface)
804 checkOldIface hsc_env mod_summary source_unchanged maybe_iface
805 = do { showPass (hsc_dflags hsc_env)
806 ("Checking old interface for " ++
807 showSDoc (ppr (ms_mod mod_summary))) ;
809 ; initIfaceCheck hsc_env $
810 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
813 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
814 = do -- CHECK WHETHER THE SOURCE HAS CHANGED
815 { ifM (not source_unchanged)
816 (traceHiDiffs (nest 4 (text "Source file changed or recompilation check turned off")))
818 -- If the source has changed and we're in interactive mode, avoid reading
819 -- an interface; just return the one we might have been supplied with.
820 ; ghc_mode <- getGhcMode
821 ; if (ghc_mode == Interactive || ghc_mode == JustTypecheck)
822 && not source_unchanged then
823 return (outOfDate, maybe_iface)
825 case maybe_iface of {
826 Just old_iface -> do -- Use the one we already have
827 { traceIf (text "We already have the old interface for" <+> ppr (ms_mod mod_summary))
828 ; recomp <- checkVersions hsc_env source_unchanged old_iface
829 ; return (recomp, Just old_iface) }
833 -- Try and read the old interface for the current module
834 -- from the .hi file left from the last time we compiled it
835 { let iface_path = msHiFilePath mod_summary
836 ; read_result <- readIface (ms_mod mod_summary) iface_path False
837 ; case read_result of {
838 Failed err -> do -- Old interface file not found, or garbled; give up
839 { traceIf (text "FYI: cannot read old interface file:"
841 ; return (outOfDate, Nothing) }
843 ; Succeeded iface -> do
845 -- We have got the old iface; check its versions
846 { traceIf (text "Read the interface file" <+> text iface_path)
847 ; recomp <- checkVersions hsc_env source_unchanged iface
848 ; returnM (recomp, Just iface)
852 @recompileRequired@ is called from the HscMain. It checks whether
853 a recompilation is required. It needs access to the persistent state,
854 finder, etc, because it may have to load lots of interface files to
855 check their versions.
858 type RecompileRequired = Bool
859 upToDate = False -- Recompile not required
860 outOfDate = True -- Recompile required
862 checkVersions :: HscEnv
863 -> Bool -- True <=> source unchanged
864 -> ModIface -- Old interface
865 -> IfG RecompileRequired
866 checkVersions hsc_env source_unchanged iface
867 | not source_unchanged
870 = do { traceHiDiffs (text "Considering whether compilation is required for" <+>
871 ppr (mi_module iface) <> colon)
873 -- Source code unchanged and no errors yet... carry on
875 -- First put the dependent-module info, read from the old interface, into the envt,
876 -- so that when we look for interfaces we look for the right one (.hi or .hi-boot)
878 -- It's just temporary because either the usage check will succeed
879 -- (in which case we are done with this module) or it'll fail (in which
880 -- case we'll compile the module from scratch anyhow).
882 -- We do this regardless of compilation mode, although in --make mode
883 -- all the dependent modules should be in the HPT already, so it's
885 ; updateEps_ $ \eps -> eps { eps_is_boot = mod_deps }
887 ; let this_pkg = thisPackage (hsc_dflags hsc_env)
888 ; checkList [checkModUsage this_pkg u | u <- mi_usages iface]
891 -- This is a bit of a hack really
892 mod_deps :: ModuleNameEnv (ModuleName, IsBootInterface)
893 mod_deps = mkModDeps (dep_mods (mi_deps iface))
895 checkModUsage :: PackageId ->Usage -> IfG RecompileRequired
896 -- Given the usage information extracted from the old
897 -- M.hi file for the module being compiled, figure out
898 -- whether M needs to be recompiled.
900 checkModUsage this_pkg (Usage { usg_name = mod_name, usg_mod = old_mod_vers,
901 usg_rules = old_rule_vers,
902 usg_exports = maybe_old_export_vers,
903 usg_entities = old_decl_vers })
904 = -- Load the imported interface is possible
906 doc_str = sep [ptext SLIT("need version info for"), ppr mod_name]
908 traceHiDiffs (text "Checking usages for module" <+> ppr mod_name) `thenM_`
911 mod = mkModule this_pkg mod_name
913 loadInterface doc_str mod ImportBySystem `thenM` \ mb_iface ->
914 -- Load the interface, but don't complain on failure;
915 -- Instead, get an Either back which we can test
918 Failed exn -> (out_of_date (sep [ptext SLIT("Can't find version number for module"),
920 -- Couldn't find or parse a module mentioned in the
921 -- old interface file. Don't complain -- it might just be that
922 -- the current module doesn't need that import and it's been deleted
926 new_mod_vers = mi_mod_vers iface
927 new_decl_vers = mi_ver_fn iface
928 new_export_vers = mi_exp_vers iface
929 new_rule_vers = mi_rule_vers iface
932 checkModuleVersion old_mod_vers new_mod_vers `thenM` \ recompile ->
933 if not recompile then
938 if checkExportList maybe_old_export_vers new_export_vers then
939 out_of_date_vers (ptext SLIT(" Export list changed"))
940 (expectJust "checkModUsage" maybe_old_export_vers)
945 if old_rule_vers /= new_rule_vers then
946 out_of_date_vers (ptext SLIT(" Rules changed"))
947 old_rule_vers new_rule_vers
950 -- CHECK ITEMS ONE BY ONE
951 checkList [checkEntityUsage new_decl_vers u | u <- old_decl_vers] `thenM` \ recompile ->
953 returnM outOfDate -- This one failed, so just bail out now
955 up_to_date (ptext SLIT(" Great! The bits I use are up to date"))
958 ------------------------
959 checkModuleVersion old_mod_vers new_mod_vers
960 | new_mod_vers == old_mod_vers
961 = up_to_date (ptext SLIT("Module version unchanged"))
964 = out_of_date_vers (ptext SLIT(" Module version has changed"))
965 old_mod_vers new_mod_vers
967 ------------------------
968 checkExportList Nothing new_vers = upToDate
969 checkExportList (Just v) new_vers = v /= new_vers
971 ------------------------
972 checkEntityUsage new_vers (name,old_vers)
973 = case new_vers name of
975 Nothing -> -- We used it before, but it ain't there now
976 out_of_date (sep [ptext SLIT("No longer exported:"), ppr name])
978 Just (_, new_vers) -- It's there, but is it up to date?
979 | new_vers == old_vers -> traceHiDiffs (text " Up to date" <+> ppr name <+> parens (ppr new_vers)) `thenM_`
981 | otherwise -> out_of_date_vers (ptext SLIT(" Out of date:") <+> ppr name)
984 up_to_date msg = traceHiDiffs msg `thenM_` returnM upToDate
985 out_of_date msg = traceHiDiffs msg `thenM_` returnM outOfDate
986 out_of_date_vers msg old_vers new_vers
987 = out_of_date (hsep [msg, ppr old_vers, ptext SLIT("->"), ppr new_vers])
989 ----------------------
990 checkList :: [IfG RecompileRequired] -> IfG RecompileRequired
991 -- This helper is used in two places
992 checkList [] = returnM upToDate
993 checkList (check:checks) = check `thenM` \ recompile ->
1000 %************************************************************************
1002 Converting things to their Iface equivalents
1004 %************************************************************************
1007 tyThingToIfaceDecl :: TyThing -> IfaceDecl
1008 -- Assumption: the thing is already tidied, so that locally-bound names
1009 -- (lambdas, for-alls) already have non-clashing OccNames
1010 -- Reason: Iface stuff uses OccNames, and the conversion here does
1011 -- not do tidying on the way
1012 tyThingToIfaceDecl (AnId id)
1013 = IfaceId { ifName = getOccName id,
1014 ifType = toIfaceType (idType id),
1017 info = case toIfaceIdInfo (idInfo id) of
1019 items -> HasInfo items
1021 tyThingToIfaceDecl (AClass clas)
1022 = IfaceClass { ifCtxt = toIfaceContext sc_theta,
1023 ifName = getOccName clas,
1024 ifTyVars = toIfaceTvBndrs clas_tyvars,
1025 ifFDs = map toIfaceFD clas_fds,
1026 ifATs = map (tyThingToIfaceDecl . ATyCon) clas_ats,
1027 ifSigs = map toIfaceClassOp op_stuff,
1028 ifRec = boolToRecFlag (isRecursiveTyCon tycon) }
1030 (clas_tyvars, clas_fds, sc_theta, _, clas_ats, op_stuff)
1031 = classExtraBigSig clas
1032 tycon = classTyCon clas
1034 toIfaceClassOp (sel_id, def_meth)
1035 = ASSERT(sel_tyvars == clas_tyvars)
1036 IfaceClassOp (getOccName sel_id) def_meth (toIfaceType op_ty)
1038 -- Be careful when splitting the type, because of things
1039 -- like class Foo a where
1040 -- op :: (?x :: String) => a -> a
1041 -- and class Baz a where
1042 -- op :: (Ord a) => a -> a
1043 (sel_tyvars, rho_ty) = splitForAllTys (idType sel_id)
1044 op_ty = funResultTy rho_ty
1046 toIfaceFD (tvs1, tvs2) = (map getFS tvs1, map getFS tvs2)
1048 tyThingToIfaceDecl (ATyCon tycon)
1050 = IfaceSyn { ifName = getOccName tycon,
1051 ifTyVars = toIfaceTvBndrs tyvars,
1052 ifOpenSyn = syn_isOpen,
1053 ifSynRhs = toIfaceType syn_tyki }
1056 = IfaceData { ifName = getOccName tycon,
1057 ifTyVars = toIfaceTvBndrs tyvars,
1058 ifCtxt = toIfaceContext (tyConStupidTheta tycon),
1059 ifCons = ifaceConDecls (algTyConRhs tycon),
1060 ifRec = boolToRecFlag (isRecursiveTyCon tycon),
1061 ifGadtSyntax = isGadtSyntaxTyCon tycon,
1062 ifGeneric = tyConHasGenerics tycon,
1063 ifFamInst = famInstToIface (tyConFamInst_maybe tycon)}
1065 | isForeignTyCon tycon
1066 = IfaceForeign { ifName = getOccName tycon,
1067 ifExtName = tyConExtName tycon }
1069 | isPrimTyCon tycon || isFunTyCon tycon
1070 -- Needed in GHCi for ':info Int#', for example
1071 = IfaceData { ifName = getOccName tycon,
1072 ifTyVars = toIfaceTvBndrs (take (tyConArity tycon) alphaTyVars),
1074 ifCons = IfAbstractTyCon,
1075 ifGadtSyntax = False,
1077 ifRec = NonRecursive,
1078 ifFamInst = Nothing }
1080 | otherwise = pprPanic "toIfaceDecl" (ppr tycon)
1082 tyvars = tyConTyVars tycon
1083 (syn_isOpen, syn_tyki) = case synTyConRhs tycon of
1084 OpenSynTyCon ki -> (True , ki)
1085 SynonymTyCon ty -> (False, ty)
1087 ifaceConDecls (NewTyCon { data_con = con }) =
1088 IfNewTyCon (ifaceConDecl con)
1089 ifaceConDecls (DataTyCon { data_cons = cons }) =
1090 IfDataTyCon (map ifaceConDecl cons)
1091 ifaceConDecls OpenDataTyCon = IfOpenDataTyCon
1092 ifaceConDecls OpenNewTyCon = IfOpenNewTyCon
1093 ifaceConDecls AbstractTyCon = IfAbstractTyCon
1094 -- The last case happens when a TyCon has been trimmed during tidying
1095 -- Furthermore, tyThingToIfaceDecl is also used
1096 -- in TcRnDriver for GHCi, when browsing a module, in which case the
1097 -- AbstractTyCon case is perfectly sensible.
1099 ifaceConDecl data_con
1100 = IfCon { ifConOcc = getOccName (dataConName data_con),
1101 ifConInfix = dataConIsInfix data_con,
1102 ifConUnivTvs = toIfaceTvBndrs (dataConUnivTyVars data_con),
1103 ifConExTvs = toIfaceTvBndrs (dataConExTyVars data_con),
1104 ifConEqSpec = to_eq_spec (dataConEqSpec data_con),
1105 ifConCtxt = toIfaceContext (dataConTheta data_con),
1106 ifConArgTys = map toIfaceType (dataConOrigArgTys data_con),
1107 ifConFields = map getOccName
1108 (dataConFieldLabels data_con),
1109 ifConStricts = dataConStrictMarks data_con }
1111 to_eq_spec spec = [(getOccName tv, toIfaceType ty) | (tv,ty) <- spec]
1113 famInstToIface Nothing = Nothing
1114 famInstToIface (Just (famTyCon, instTys)) =
1115 Just (toIfaceTyCon famTyCon, map toIfaceType instTys)
1117 tyThingToIfaceDecl (ADataCon dc)
1118 = pprPanic "toIfaceDecl" (ppr dc) -- Should be trimmed out earlier
1121 getFS x = occNameFS (getOccName x)
1123 --------------------------
1124 instanceToIfaceInst :: Instance -> IfaceInst
1125 instanceToIfaceInst ispec@(Instance { is_dfun = dfun_id, is_flag = oflag,
1126 is_cls = cls, is_tcs = mb_tcs,
1128 = IfaceInst { ifDFun = getName dfun_id,
1131 ifInstTys = map do_rough mb_tcs,
1134 do_rough Nothing = Nothing
1135 do_rough (Just n) = Just (toIfaceTyCon_name n)
1137 --------------------------
1138 famInstToIfaceFamInst :: FamInst -> IfaceFamInst
1139 famInstToIfaceFamInst fi@(FamInst { fi_tycon = tycon,
1140 fi_fam = fam, fi_tcs = mb_tcs })
1141 = IfaceFamInst { ifFamInstTyCon = toIfaceTyCon tycon
1142 , ifFamInstFam = fam
1143 , ifFamInstTys = map do_rough mb_tcs }
1145 do_rough Nothing = Nothing
1146 do_rough (Just n) = Just (toIfaceTyCon_name n)
1148 --------------------------
1149 toIfaceIdInfo :: IdInfo -> [IfaceInfoItem]
1150 toIfaceIdInfo id_info
1151 = catMaybes [arity_hsinfo, caf_hsinfo, strict_hsinfo,
1152 inline_hsinfo, wrkr_hsinfo, unfold_hsinfo]
1154 ------------ Arity --------------
1155 arity_info = arityInfo id_info
1156 arity_hsinfo | arity_info == 0 = Nothing
1157 | otherwise = Just (HsArity arity_info)
1159 ------------ Caf Info --------------
1160 caf_info = cafInfo id_info
1161 caf_hsinfo = case caf_info of
1162 NoCafRefs -> Just HsNoCafRefs
1165 ------------ Strictness --------------
1166 -- No point in explicitly exporting TopSig
1167 strict_hsinfo = case newStrictnessInfo id_info of
1168 Just sig | not (isTopSig sig) -> Just (HsStrictness sig)
1171 ------------ Worker --------------
1172 work_info = workerInfo id_info
1173 has_worker = case work_info of { HasWorker _ _ -> True; other -> False }
1174 wrkr_hsinfo = case work_info of
1175 HasWorker work_id wrap_arity ->
1176 Just (HsWorker ((idName work_id)) wrap_arity)
1179 ------------ Unfolding --------------
1180 -- The unfolding is redundant if there is a worker
1181 unfold_info = unfoldingInfo id_info
1182 rhs = unfoldingTemplate unfold_info
1183 no_unfolding = neverUnfold unfold_info
1184 -- The CoreTidy phase retains unfolding info iff
1185 -- we want to expose the unfolding, taking into account
1186 -- unconditional NOINLINE, etc. See TidyPgm.addExternal
1187 unfold_hsinfo | no_unfolding = Nothing
1188 | has_worker = Nothing -- Unfolding is implicit
1189 | otherwise = Just (HsUnfold (toIfaceExpr rhs))
1191 ------------ Inline prag --------------
1192 inline_prag = inlinePragInfo id_info
1193 inline_hsinfo | isAlwaysActive inline_prag = Nothing
1194 | no_unfolding && not has_worker = Nothing
1195 -- If the iface file give no unfolding info, we
1196 -- don't need to say when inlining is OK!
1197 | otherwise = Just (HsInline inline_prag)
1199 --------------------------
1200 coreRuleToIfaceRule :: CoreRule -> IfaceRule
1201 coreRuleToIfaceRule (BuiltinRule { ru_fn = fn})
1202 = pprTrace "toHsRule: builtin" (ppr fn) $
1205 coreRuleToIfaceRule (Rule { ru_name = name, ru_fn = fn,
1206 ru_act = act, ru_bndrs = bndrs,
1207 ru_args = args, ru_rhs = rhs, ru_orph = orph })
1208 = IfaceRule { ifRuleName = name, ifActivation = act,
1209 ifRuleBndrs = map toIfaceBndr bndrs,
1211 ifRuleArgs = map do_arg args,
1212 ifRuleRhs = toIfaceExpr rhs,
1215 -- For type args we must remove synonyms from the outermost
1216 -- level. Reason: so that when we read it back in we'll
1217 -- construct the same ru_rough field as we have right now;
1219 do_arg (Type ty) = IfaceType (toIfaceType (deNoteType ty))
1220 do_arg arg = toIfaceExpr arg
1222 bogusIfaceRule :: Name -> IfaceRule
1223 bogusIfaceRule id_name
1224 = IfaceRule { ifRuleName = FSLIT("bogus"), ifActivation = NeverActive,
1225 ifRuleBndrs = [], ifRuleHead = id_name, ifRuleArgs = [],
1226 ifRuleRhs = IfaceExt id_name, ifRuleOrph = Nothing }
1228 ---------------------
1229 toIfaceExpr :: CoreExpr -> IfaceExpr
1230 toIfaceExpr (Var v) = toIfaceVar v
1231 toIfaceExpr (Lit l) = IfaceLit l
1232 toIfaceExpr (Type ty) = IfaceType (toIfaceType ty)
1233 toIfaceExpr (Lam x b) = IfaceLam (toIfaceBndr x) (toIfaceExpr b)
1234 toIfaceExpr (App f a) = toIfaceApp f [a]
1235 toIfaceExpr (Case s x ty as) = IfaceCase (toIfaceExpr s) (getFS x) (toIfaceType ty) (map toIfaceAlt as)
1236 toIfaceExpr (Let b e) = IfaceLet (toIfaceBind b) (toIfaceExpr e)
1237 toIfaceExpr (Cast e co) = IfaceCast (toIfaceExpr e) (toIfaceType co)
1238 toIfaceExpr (Note n e) = IfaceNote (toIfaceNote n) (toIfaceExpr e)
1240 ---------------------
1241 toIfaceNote (SCC cc) = IfaceSCC cc
1242 toIfaceNote InlineMe = IfaceInlineMe
1243 toIfaceNote (CoreNote s) = IfaceCoreNote s
1245 ---------------------
1246 toIfaceBind (NonRec b r) = IfaceNonRec (toIfaceIdBndr b) (toIfaceExpr r)
1247 toIfaceBind (Rec prs) = IfaceRec [(toIfaceIdBndr b, toIfaceExpr r) | (b,r) <- prs]
1249 ---------------------
1250 toIfaceAlt (c,bs,r) = (toIfaceCon c, map getFS bs, toIfaceExpr r)
1252 ---------------------
1253 toIfaceCon (DataAlt dc) | isTupleTyCon tc = IfaceTupleAlt (tupleTyConBoxity tc)
1254 | otherwise = IfaceDataAlt (getName dc)
1256 tc = dataConTyCon dc
1258 toIfaceCon (LitAlt l) = IfaceLitAlt l
1259 toIfaceCon DEFAULT = IfaceDefault
1261 ---------------------
1262 toIfaceApp (App f a) as = toIfaceApp f (a:as)
1263 toIfaceApp (Var v) as
1264 = case isDataConWorkId_maybe v of
1265 -- We convert the *worker* for tuples into IfaceTuples
1266 Just dc | isTupleTyCon tc && saturated
1267 -> IfaceTuple (tupleTyConBoxity tc) tup_args
1269 val_args = dropWhile isTypeArg as
1270 saturated = val_args `lengthIs` idArity v
1271 tup_args = map toIfaceExpr val_args
1272 tc = dataConTyCon dc
1274 other -> mkIfaceApps (toIfaceVar v) as
1276 toIfaceApp e as = mkIfaceApps (toIfaceExpr e) as
1278 mkIfaceApps f as = foldl (\f a -> IfaceApp f (toIfaceExpr a)) f as
1280 ---------------------
1281 toIfaceVar :: Id -> IfaceExpr
1283 | Just fcall <- isFCallId_maybe v = IfaceFCall fcall (toIfaceType (idType v))
1284 -- Foreign calls have special syntax
1285 | isExternalName name = IfaceExt name
1286 | otherwise = IfaceLcl (getFS name)