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"
207 import PackageConfig hiding ( Version )
209 import BasicTypes hiding ( SuccessFlag(..) )
211 import Util hiding ( eqListBy )
222 %************************************************************************
224 \subsection{Completing an interface}
226 %************************************************************************
230 -> Maybe ModIface -- The old interface, if we have it
231 -> ModGuts -- Usages, deprecations, etc
232 -> ModDetails -- The trimmed, tidied interface
233 -> IO (ModIface, -- The new one, complete with decls and versions
234 Bool) -- True <=> there was an old Iface, and the new one
235 -- is identical, so no need to write it
237 mkIface hsc_env maybe_old_iface
238 (ModGuts{ mg_module = this_mod,
242 mg_rdr_env = rdr_env,
243 mg_fix_env = fix_env,
244 mg_deprecs = src_deprecs })
245 (ModDetails{ md_insts = insts,
246 md_fam_insts = fam_insts,
249 md_exports = exports })
251 -- NB: notice that mkIface does not look at the bindings
252 -- only at the TypeEnv. The previous Tidy phase has
253 -- put exactly the info into the TypeEnv that we want
254 -- to expose in the interface
256 = do { eps <- hscEPS hsc_env
257 ; let { entities = typeEnvElts type_env ;
258 decls = [ tyThingToIfaceDecl entity
259 | entity <- entities,
260 not (isImplicitTyThing entity
261 || isWiredInName (getName entity)) ]
262 -- Don't put implicit Ids and class tycons in
263 -- the interface file, Nor wired-in things; the
264 -- compiler knows about them anyhow
266 ; fixities = [(occ,fix) | FixItem occ fix _ <- nameEnvElts fix_env]
267 ; deprecs = mkIfaceDeprec src_deprecs
268 ; iface_rules = map coreRuleToIfaceRule rules
269 ; iface_insts = map instanceToIfaceInst insts
270 ; iface_fam_insts = map famInstToIfaceFamInst fam_insts
272 ; intermediate_iface = ModIface {
273 mi_module = this_mod,
277 mi_exports = mkIfaceExports exports,
279 -- Sort these lexicographically, so that
280 -- the result is stable across compilations
281 mi_insts = sortLe le_inst iface_insts,
282 mi_fam_insts= sortLe le_fam_inst iface_fam_insts,
283 mi_rules = sortLe le_rule iface_rules,
285 mi_fixities = fixities,
286 mi_deprecs = deprecs,
287 mi_globals = Just rdr_env,
289 -- Left out deliberately: filled in by addVersionInfo
290 mi_mod_vers = initialVersion,
291 mi_exp_vers = initialVersion,
292 mi_rule_vers = initialVersion,
293 mi_orphan = False, -- Always set by addVersionInfo, but
294 -- it's a strict field, so we can't omit it.
295 mi_finsts = False, -- Ditto
296 mi_decls = deliberatelyOmitted "decls",
297 mi_ver_fn = deliberatelyOmitted "ver_fn",
299 -- And build the cached values
300 mi_dep_fn = mkIfaceDepCache deprecs,
301 mi_fix_fn = mkIfaceFixCache fixities }
303 -- Add version information
304 ; ext_ver_fn = mkParentVerFun hsc_env eps
305 ; (new_iface, no_change_at_all, pp_diffs, pp_orphs)
306 = _scc_ "versioninfo"
307 addVersionInfo ext_ver_fn maybe_old_iface
308 intermediate_iface decls
312 ; when (isJust pp_orphs && dopt Opt_WarnOrphans dflags)
313 (printDump (expectJust "mkIface" pp_orphs))
314 ; when (dopt Opt_D_dump_hi_diffs dflags) (printDump pp_diffs)
315 ; dumpIfSet_dyn dflags Opt_D_dump_hi "FINAL INTERFACE"
316 (pprModIface new_iface)
318 ; return (new_iface, no_change_at_all) }
320 r1 `le_rule` r2 = ifRuleName r1 <= ifRuleName r2
321 i1 `le_inst` i2 = ifDFun i1 `le_occ` ifDFun i2
322 i1 `le_fam_inst` i2 = ifFamInstTcName i1 `le_occ` ifFamInstTcName i2
324 le_occ :: Name -> Name -> Bool
325 -- Compare lexicographically by OccName, *not* by unique, because
326 -- the latter is not stable across compilations
327 le_occ n1 n2 = nameOccName n1 <= nameOccName n2
329 dflags = hsc_dflags hsc_env
330 deliberatelyOmitted x = panic ("Deliberately omitted: " ++ x)
331 ifFamInstTcName = ifaceTyConName . ifFamInstTyCon
334 -----------------------------
335 writeIfaceFile :: DynFlags -> ModLocation -> ModIface -> IO ()
336 writeIfaceFile dflags location new_iface
337 = do createDirectoryHierarchy (directoryOf hi_file_path)
338 writeBinIface dflags hi_file_path new_iface
339 where hi_file_path = ml_hi_file location
342 -- -----------------------------------------------------------------------------
343 -- Look up parents and versions of Names
345 -- This is like a global version of the mi_ver_fn field in each ModIface.
346 -- Given a Name, it finds the ModIface, and then uses mi_ver_fn to get
347 -- the parent and version info.
350 :: HscEnv -- needed to look up versions
351 -> ExternalPackageState -- ditto
352 -> (Name -> (OccName,Version))
353 mkParentVerFun hsc_env eps
356 mod = nameModule name
357 occ = nameOccName name
358 iface = lookupIfaceByModule (hsc_dflags hsc_env) hpt pit mod `orElse`
359 pprPanic "lookupVers2" (ppr mod <+> ppr occ)
361 mi_ver_fn iface occ `orElse`
362 pprPanic "lookupVers1" (ppr mod <+> ppr occ)
364 hpt = hsc_HPT hsc_env
367 -----------------------------------------------------------------------------
368 -- Compute version numbers for local decls
371 :: (Name -> (OccName,Version)) -- lookup parents and versions of names
372 -> Maybe ModIface -- The old interface, read from M.hi
373 -> ModIface -- The new interface (lacking decls)
374 -> [IfaceDecl] -- The new decls
375 -> (ModIface, -- Updated interface
376 Bool, -- True <=> no changes at all; no need to write Iface
378 Maybe SDoc) -- Warnings about orphans
380 addVersionInfo ver_fn Nothing new_iface new_decls
381 -- No old interface, so definitely write a new one!
382 = (new_iface { mi_orphan = anyNothing ifInstOrph (mi_insts new_iface)
383 || anyNothing ifRuleOrph (mi_rules new_iface)
384 , mi_finsts = not . null $ mi_fam_insts new_iface
385 , mi_decls = [(initialVersion, decl) | decl <- new_decls]
386 , mi_ver_fn = mkIfaceVerCache (zip (repeat initialVersion)
390 ptext SLIT("No old interface file"),
391 pprOrphans orph_insts orph_rules)
393 orph_insts = filter (isNothing . ifInstOrph) (mi_insts new_iface)
394 orph_rules = filter (isNothing . ifRuleOrph) (mi_rules new_iface)
396 addVersionInfo ver_fn (Just old_iface@(ModIface {
397 mi_mod_vers = old_mod_vers,
398 mi_exp_vers = old_exp_vers,
399 mi_rule_vers = old_rule_vers,
400 mi_decls = old_decls,
401 mi_ver_fn = old_decl_vers,
402 mi_fix_fn = old_fixities }))
403 new_iface@(ModIface { mi_fix_fn = new_fixities })
406 = (old_iface, True, ptext SLIT("Interface file unchanged"), pp_orphs)
408 = (final_iface, False, vcat [ptext SLIT("Interface file has changed"),
409 nest 2 pp_diffs], pp_orphs)
411 final_iface = new_iface {
412 mi_mod_vers = bump_unless no_output_change old_mod_vers,
413 mi_exp_vers = bump_unless no_export_change old_exp_vers,
414 mi_rule_vers = bump_unless no_rule_change old_rule_vers,
415 mi_orphan = not (null new_orph_rules && null new_orph_insts),
416 mi_finsts = not . null $ mi_fam_insts new_iface,
417 mi_decls = decls_w_vers,
418 mi_ver_fn = mkIfaceVerCache decls_w_vers }
420 decls_w_vers = [(add_vers decl, decl) | decl <- new_decls]
423 (old_non_orph_insts, old_orph_insts) =
424 mkOrphMap ifInstOrph (mi_insts old_iface)
425 (new_non_orph_insts, new_orph_insts) =
426 mkOrphMap ifInstOrph (mi_insts new_iface)
427 old_fam_insts = mi_fam_insts old_iface
428 new_fam_insts = mi_fam_insts new_iface
429 same_insts occ = eqMaybeBy (eqListBy eqIfInst)
430 (lookupOccEnv old_non_orph_insts occ)
431 (lookupOccEnv new_non_orph_insts occ)
433 (old_non_orph_rules, old_orph_rules) =
434 mkOrphMap ifRuleOrph (mi_rules old_iface)
435 (new_non_orph_rules, new_orph_rules) =
436 mkOrphMap ifRuleOrph (mi_rules new_iface)
437 same_rules occ = eqMaybeBy (eqListBy eqIfRule)
438 (lookupOccEnv old_non_orph_rules occ)
439 (lookupOccEnv new_non_orph_rules occ)
441 -- Computing what changed
442 no_output_change = no_decl_change && no_rule_change &&
443 no_export_change && no_deprec_change
444 no_export_change = mi_exports new_iface == mi_exports old_iface
446 no_decl_change = isEmptyOccSet changed_occs
447 no_rule_change = not (changedWrtNames changed_occs (eqListBy eqIfRule old_orph_rules new_orph_rules)
448 || changedWrtNames changed_occs (eqListBy eqIfInst old_orph_insts new_orph_insts)
449 || changedWrtNames changed_occs (eqListBy eqIfFamInst old_fam_insts new_fam_insts))
450 no_deprec_change = mi_deprecs new_iface == mi_deprecs old_iface
452 -- If the usages havn't changed either, we don't need to write the interface file
453 no_other_changes = mi_usages new_iface == mi_usages old_iface &&
454 mi_deps new_iface == mi_deps old_iface
455 no_change_at_all = no_output_change && no_other_changes
457 pp_diffs = vcat [pp_change no_export_change "Export list"
458 (ppr old_exp_vers <+> arrow <+> ppr (mi_exp_vers final_iface)),
459 pp_change no_rule_change "Rules"
460 (ppr old_rule_vers <+> arrow <+> ppr (mi_rule_vers final_iface)),
461 pp_change no_deprec_change "Deprecations" empty,
462 pp_change no_other_changes "Usages" empty,
464 pp_change True what info = empty
465 pp_change False what info = text what <+> ptext SLIT("changed") <+> info
468 old_decl_env = mkOccEnv [(ifName decl, decl) | (_,decl) <- old_decls]
469 same_fixity n = bool (old_fixities n == new_fixities n)
472 -- Adding version info
473 new_version = bumpVersion old_mod_vers
474 -- Start from the old module version, not from
475 -- zero so that if you remove f, and then add
476 -- it again, you don't thereby reduce f's
479 add_vers decl | occ `elemOccSet` changed_occs = new_version
480 | otherwise = snd (expectJust "add_vers" (old_decl_vers occ))
481 -- If it's unchanged, there jolly well
482 where -- should be an old version number
486 -- Deciding which declarations have changed
488 -- For each local decl, the IfaceEq gives the list of things that
489 -- must be unchanged for the declaration as a whole to be unchanged.
490 eq_info :: [(OccName, IfaceEq)]
491 eq_info = map check_eq new_decls
493 | Just old_decl <- lookupOccEnv old_decl_env occ
494 = (occ, new_decl `eqIfDecl` old_decl &&& eq_indirects new_decl)
495 | otherwise {- No corresponding old decl -}
498 occ = ifName new_decl
500 eq_indirects :: IfaceDecl -> IfaceEq
501 -- When seeing if two decls are the same, remember to
502 -- check whether any relevant fixity or rules have changed
503 eq_indirects (IfaceId {ifName = occ}) = eq_ind_occ occ
504 eq_indirects (IfaceClass {ifName = cls_occ, ifSigs = sigs})
505 = same_insts cls_occ &&&
506 eq_ind_occs [op | IfaceClassOp op _ _ <- sigs]
507 eq_indirects (IfaceData {ifName = tc_occ, ifCons = cons})
508 = same_insts tc_occ &&& same_fixity tc_occ &&& -- The TyCon can have a fixity too
509 eq_ind_occs (map ifConOcc (visibleIfConDecls cons))
510 eq_indirects other = Equal -- Synonyms and foreign declarations
512 eq_ind_occ :: OccName -> IfaceEq -- For class ops and Ids; check fixity and rules
513 eq_ind_occ occ = same_fixity occ &&& same_rules occ
514 eq_ind_occs = foldr ((&&&) . eq_ind_occ) Equal
516 -- The Occs of declarations that changed.
517 changed_occs :: OccSet
518 changed_occs = computeChangedOccs ver_fn (mi_module new_iface)
519 (mi_usages old_iface) eq_info
523 pp_decl_diffs :: SDoc -- Nothing => no changes
525 | isEmptyOccSet changed_occs = empty
527 = vcat [ptext SLIT("Changed occs:") <+> ppr (occSetElts changed_occs),
528 ptext SLIT("Version change for these decls:"),
529 nest 2 (vcat (map show_change new_decls))]
531 eq_env = mkOccEnv eq_info
533 | not (occ `elemOccSet` changed_occs) = empty
535 = vcat [ppr occ <+> ppr (old_decl_vers occ) <+> arrow <+> ppr new_version,
538 occ = ifName new_decl
539 why = case lookupOccEnv eq_env occ of
540 Just (EqBut names) -> sep [ppr occ <> colon, ptext SLIT("Free vars (only) changed:"),
541 nest 2 (braces (fsep (map ppr (occSetElts
542 (occs `intersectOccSet` changed_occs)))))]
543 where occs = mkOccSet (map nameOccName (nameSetToList names))
545 | Just old_decl <- lookupOccEnv old_decl_env occ
546 -> vcat [ptext SLIT("Old:") <+> ppr old_decl,
547 ptext SLIT("New:") <+> ppr new_decl]
549 -> ppr occ <+> ptext SLIT("only in new interface")
550 other -> pprPanic "MkIface.show_change" (ppr occ)
552 pp_orphs = pprOrphans new_orph_insts new_orph_rules
555 pprOrphans insts rules
556 | null insts && null rules = Nothing
559 if null insts then empty else
560 hang (ptext SLIT("Warning: orphan instances:"))
561 2 (vcat (map ppr insts)),
562 if null rules then empty else
563 hang (ptext SLIT("Warning: orphan rules:"))
564 2 (vcat (map ppr rules))
568 :: (Name -> (OccName,Version)) -- get parents and versions
569 -> Module -- This module
570 -> [Usage] -- Usages from old iface
571 -> [(OccName, IfaceEq)] -- decl names, equality conditions
572 -> OccSet -- set of things that have changed
573 computeChangedOccs ver_fn this_module old_usages eq_info
574 = foldl add_changes emptyOccSet (stronglyConnComp edges)
577 -- return True if an external name has changed
578 name_changed :: Name -> Bool
580 | Just ents <- lookupUFM usg_modmap (moduleName mod)
581 = case lookupUFM ents parent_occ of
582 Nothing -> pprPanic "computeChangedOccs" (ppr nm)
583 Just v -> v < new_version
584 | otherwise = False -- must be in another package
587 (parent_occ, new_version) = ver_fn nm
589 -- Turn the usages from the old ModIface into a mapping
590 usg_modmap = listToUFM [ (usg_mod usg, listToUFM (usg_entities usg))
591 | usg <- old_usages ]
593 get_local_eq_info :: GenIfaceEq NameSet -> GenIfaceEq OccSet
594 get_local_eq_info Equal = Equal
595 get_local_eq_info NotEqual = NotEqual
596 get_local_eq_info (EqBut ns) = foldNameSet f Equal ns
597 where f name eq | nameModule name == this_module =
598 EqBut (unitOccSet (nameOccName name)) `and_occifeq` eq
599 | name_changed name = NotEqual
602 local_eq_infos = mapSnd get_local_eq_info eq_info
604 edges :: [((OccName, OccIfaceEq), Unique, [Unique])]
605 edges = [ (node, getUnique occ, map getUnique occs)
606 | node@(occ, iface_eq) <- local_eq_infos
607 , let occs = case iface_eq of
608 EqBut occ_set -> occSetElts occ_set
611 -- Changes in declarations
612 add_changes :: OccSet -> SCC (OccName, OccIfaceEq) -> OccSet
613 add_changes so_far (AcyclicSCC (occ, iface_eq))
614 | changedWrt so_far iface_eq -- This one has changed
615 = extendOccSet so_far occ
616 add_changes so_far (CyclicSCC pairs)
617 | changedWrt so_far (foldr1 and_occifeq iface_eqs)
618 -- One of this group has changed
619 = extendOccSetList so_far occs
620 where (occs, iface_eqs) = unzip pairs
621 add_changes so_far other = so_far
623 type OccIfaceEq = GenIfaceEq OccSet
625 changedWrt :: OccSet -> OccIfaceEq -> Bool
626 changedWrt so_far Equal = False
627 changedWrt so_far NotEqual = True
628 changedWrt so_far (EqBut kids) = so_far `intersectsOccSet` kids
630 changedWrtNames :: OccSet -> IfaceEq -> Bool
631 changedWrtNames so_far Equal = False
632 changedWrtNames so_far NotEqual = True
633 changedWrtNames so_far (EqBut kids) =
634 so_far `intersectsOccSet` mkOccSet (map nameOccName (nameSetToList kids))
636 and_occifeq :: OccIfaceEq -> OccIfaceEq -> OccIfaceEq
637 Equal `and_occifeq` x = x
638 NotEqual `and_occifeq` x = NotEqual
639 EqBut nms `and_occifeq` Equal = EqBut nms
640 EqBut nms `and_occifeq` NotEqual = NotEqual
641 EqBut nms1 `and_occifeq` EqBut nms2 = EqBut (nms1 `unionOccSets` nms2)
643 ----------------------
644 -- mkOrphMap partitions instance decls or rules into
645 -- (a) an OccEnv for ones that are not orphans,
646 -- mapping the local OccName to a list of its decls
647 -- (b) a list of orphan decls
648 mkOrphMap :: (decl -> Maybe OccName) -- (Just occ) for a non-orphan decl, keyed by occ
649 -- Nothing for an orphan decl
650 -> [decl] -- Sorted into canonical order
651 -> (OccEnv [decl], -- Non-orphan decls associated with their key;
652 -- each sublist in canonical order
653 [decl]) -- Orphan decls; in canonical order
654 mkOrphMap get_key decls
655 = foldl go (emptyOccEnv, []) decls
657 go (non_orphs, orphs) d
658 | Just occ <- get_key d
659 = (extendOccEnv_C (\ ds _ -> d:ds) non_orphs occ [d], orphs)
660 | otherwise = (non_orphs, d:orphs)
662 anyNothing :: (a -> Maybe b) -> [a] -> Bool
663 anyNothing p [] = False
664 anyNothing p (x:xs) = isNothing (p x) || anyNothing p xs
666 ----------------------
667 mkIfaceDeprec :: Deprecations -> IfaceDeprecs
668 mkIfaceDeprec NoDeprecs = NoDeprecs
669 mkIfaceDeprec (DeprecAll t) = DeprecAll t
670 mkIfaceDeprec (DeprecSome env) = DeprecSome (sortLe (<=) (nameEnvElts env))
672 ----------------------
673 bump_unless :: Bool -> Version -> Version
674 bump_unless True v = v -- True <=> no change
675 bump_unless False v = bumpVersion v
679 %*********************************************************
681 \subsection{Keeping track of what we've slurped, and version numbers}
683 %*********************************************************
687 mkUsageInfo :: HscEnv
688 -> ModuleEnv (Module, Bool, SrcSpan)
689 -> [(ModuleName, IsBootInterface)]
690 -> NameSet -> IO [Usage]
691 mkUsageInfo hsc_env dir_imp_mods dep_mods used_names
692 = do { eps <- hscEPS hsc_env
693 ; let usages = mk_usage_info (eps_PIT eps) hsc_env
694 dir_imp_mods dep_mods used_names
695 ; usages `seqList` return usages }
696 -- seq the list of Usages returned: occasionally these
697 -- don't get evaluated for a while and we can end up hanging on to
698 -- the entire collection of Ifaces.
700 mk_usage_info pit hsc_env dir_imp_mods dep_mods used_names
701 = mapCatMaybes mkUsage dep_mods
702 -- ToDo: do we need to sort into canonical order?
704 hpt = hsc_HPT hsc_env
705 dflags = hsc_dflags hsc_env
707 -- ent_map groups together all the things imported and used
708 -- from a particular module in this package
709 ent_map :: ModuleEnv [OccName]
710 ent_map = foldNameSet add_mv emptyModuleEnv used_names
712 | isWiredInName name = mv_map -- ignore wired-in names
714 = case nameModule_maybe name of
715 Nothing -> mv_map -- ignore internal names
716 Just mod -> extendModuleEnv_C add_item mv_map mod [occ]
718 occ = nameOccName name
719 add_item occs _ = occ:occs
721 depend_on_exports mod = case lookupModuleEnv dir_imp_mods mod of
722 Just (_,no_imp,_) -> not no_imp
725 -- We want to create a Usage for a home module if
726 -- a) we used something from; has something in used_names
727 -- b) we imported all of it, even if we used nothing from it
728 -- (need to recompile if its export list changes: export_vers)
729 -- c) is a home-package orphan or family-instance module (need to
730 -- recompile if its instance decls change: rules_vers)
731 mkUsage :: (ModuleName, IsBootInterface) -> Maybe Usage
732 mkUsage (mod_name, _)
733 | isNothing maybe_iface -- We can't depend on it if we didn't
734 || (null used_occs -- load its interface.
735 && isNothing export_vers
738 = Nothing -- Record no usage info
741 = Just (Usage { usg_name = mod_name,
743 usg_exports = export_vers,
744 usg_entities = fmToList ent_vers,
745 usg_rules = rules_vers })
747 maybe_iface = lookupIfaceByModule dflags hpt pit mod
748 -- In one-shot mode, the interfaces for home-package
749 -- modules accumulate in the PIT not HPT. Sigh.
751 mod = mkModule (thisPackage dflags) mod_name
753 Just iface = maybe_iface
754 orphan_mod = mi_orphan iface
755 finsts_mod = mi_finsts iface
756 version_env = mi_ver_fn iface
757 mod_vers = mi_mod_vers iface
758 rules_vers = mi_rule_vers iface
759 export_vers | depend_on_exports mod = Just (mi_exp_vers iface)
760 | otherwise = Nothing
762 used_occs = lookupModuleEnv ent_map mod `orElse` []
764 -- Making a FiniteMap here ensures that (a) we remove duplicates
765 -- when we have usages on several subordinates of a single parent,
766 -- and (b) that the usages emerge in a canonical order, which
767 -- is why we use FiniteMap rather than OccEnv: FiniteMap works
768 -- using Ord on the OccNames, which is a lexicographic ordering.
769 ent_vers :: FiniteMap OccName Version
770 ent_vers = listToFM (map lookup_occ used_occs)
773 case version_env occ of
774 Nothing -> pprTrace "hmm, strange" (ppr mod <+> ppr occ) $
775 (occ, initialVersion) -- does this ever happen?
776 Just (parent, version) -> (parent, version)
780 mkIfaceExports :: [AvailInfo]
781 -> [(Module, [GenAvailInfo OccName])]
782 -- Group by module and sort by occurrence
783 -- This keeps the list in canonical order
784 mkIfaceExports exports
785 = [ (mod, eltsFM avails)
786 | (mod, avails) <- fmToList groupFM
789 -- Deliberately use FiniteMap rather than UniqFM so we
790 -- get a canonical ordering
791 groupFM :: ModuleEnv (FiniteMap FastString (GenAvailInfo OccName))
792 groupFM = foldl add emptyModuleEnv exports
795 = extendModuleEnv_C add_avail env mod (unitFM avail_fs avail_occ)
797 avail_occ = availToOccs avail
798 mod = nameModule (availName avail)
799 avail_fs = occNameFS (availName avail_occ)
800 add_avail avail_fm _ = addToFM avail_fm avail_fs avail_occ
802 availToOccs (Avail n) = Avail (nameOccName n)
803 availToOccs (AvailTC tc ns) = AvailTC (nameOccName tc) (map nameOccName ns)
807 %************************************************************************
809 Load the old interface file for this module (unless
810 we have it aleady), and check whether it is up to date
813 %************************************************************************
816 checkOldIface :: HscEnv
818 -> Bool -- Source unchanged
819 -> Maybe ModIface -- Old interface from compilation manager, if any
820 -> IO (RecompileRequired, Maybe ModIface)
822 checkOldIface hsc_env mod_summary source_unchanged maybe_iface
823 = do { showPass (hsc_dflags hsc_env)
824 ("Checking old interface for " ++
825 showSDoc (ppr (ms_mod mod_summary))) ;
827 ; initIfaceCheck hsc_env $
828 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
831 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
832 = do -- CHECK WHETHER THE SOURCE HAS CHANGED
833 { ifM (not source_unchanged)
834 (traceHiDiffs (nest 4 (text "Source file changed or recompilation check turned off")))
836 -- If the source has changed and we're in interactive mode, avoid reading
837 -- an interface; just return the one we might have been supplied with.
838 ; ghc_mode <- getGhcMode
839 ; if (ghc_mode == Interactive || ghc_mode == JustTypecheck)
840 && not source_unchanged then
841 return (outOfDate, maybe_iface)
843 case maybe_iface of {
844 Just old_iface -> do -- Use the one we already have
845 { traceIf (text "We already have the old interface for" <+> ppr (ms_mod mod_summary))
846 ; recomp <- checkVersions hsc_env source_unchanged old_iface
847 ; return (recomp, Just old_iface) }
851 -- Try and read the old interface for the current module
852 -- from the .hi file left from the last time we compiled it
853 { let iface_path = msHiFilePath mod_summary
854 ; read_result <- readIface (ms_mod mod_summary) iface_path False
855 ; case read_result of {
856 Failed err -> do -- Old interface file not found, or garbled; give up
857 { traceIf (text "FYI: cannot read old interface file:"
859 ; return (outOfDate, Nothing) }
861 ; Succeeded iface -> do
863 -- We have got the old iface; check its versions
864 { traceIf (text "Read the interface file" <+> text iface_path)
865 ; recomp <- checkVersions hsc_env source_unchanged iface
866 ; returnM (recomp, Just iface)
870 @recompileRequired@ is called from the HscMain. It checks whether
871 a recompilation is required. It needs access to the persistent state,
872 finder, etc, because it may have to load lots of interface files to
873 check their versions.
876 type RecompileRequired = Bool
877 upToDate = False -- Recompile not required
878 outOfDate = True -- Recompile required
880 checkVersions :: HscEnv
881 -> Bool -- True <=> source unchanged
882 -> ModIface -- Old interface
883 -> IfG RecompileRequired
884 checkVersions hsc_env source_unchanged iface
885 | not source_unchanged
888 = do { traceHiDiffs (text "Considering whether compilation is required for" <+>
889 ppr (mi_module iface) <> colon)
891 -- Source code unchanged and no errors yet... carry on
893 -- First put the dependent-module info, read from the old interface, into the envt,
894 -- so that when we look for interfaces we look for the right one (.hi or .hi-boot)
896 -- It's just temporary because either the usage check will succeed
897 -- (in which case we are done with this module) or it'll fail (in which
898 -- case we'll compile the module from scratch anyhow).
900 -- We do this regardless of compilation mode, although in --make mode
901 -- all the dependent modules should be in the HPT already, so it's
903 ; updateEps_ $ \eps -> eps { eps_is_boot = mod_deps }
905 ; let this_pkg = thisPackage (hsc_dflags hsc_env)
906 ; checkList [checkModUsage this_pkg u | u <- mi_usages iface]
909 -- This is a bit of a hack really
910 mod_deps :: ModuleNameEnv (ModuleName, IsBootInterface)
911 mod_deps = mkModDeps (dep_mods (mi_deps iface))
913 checkModUsage :: PackageId ->Usage -> IfG RecompileRequired
914 -- Given the usage information extracted from the old
915 -- M.hi file for the module being compiled, figure out
916 -- whether M needs to be recompiled.
918 checkModUsage this_pkg (Usage { usg_name = mod_name, usg_mod = old_mod_vers,
919 usg_rules = old_rule_vers,
920 usg_exports = maybe_old_export_vers,
921 usg_entities = old_decl_vers })
922 = -- Load the imported interface is possible
924 doc_str = sep [ptext SLIT("need version info for"), ppr mod_name]
926 traceHiDiffs (text "Checking usages for module" <+> ppr mod_name) `thenM_`
929 mod = mkModule this_pkg mod_name
931 loadInterface doc_str mod ImportBySystem `thenM` \ mb_iface ->
932 -- Load the interface, but don't complain on failure;
933 -- Instead, get an Either back which we can test
936 Failed exn -> (out_of_date (sep [ptext SLIT("Can't find version number for module"),
938 -- Couldn't find or parse a module mentioned in the
939 -- old interface file. Don't complain -- it might just be that
940 -- the current module doesn't need that import and it's been deleted
944 new_mod_vers = mi_mod_vers iface
945 new_decl_vers = mi_ver_fn iface
946 new_export_vers = mi_exp_vers iface
947 new_rule_vers = mi_rule_vers iface
950 checkModuleVersion old_mod_vers new_mod_vers `thenM` \ recompile ->
951 if not recompile then
956 if checkExportList maybe_old_export_vers new_export_vers then
957 out_of_date_vers (ptext SLIT(" Export list changed"))
958 (expectJust "checkModUsage" maybe_old_export_vers)
963 if old_rule_vers /= new_rule_vers then
964 out_of_date_vers (ptext SLIT(" Rules changed"))
965 old_rule_vers new_rule_vers
968 -- CHECK ITEMS ONE BY ONE
969 checkList [checkEntityUsage new_decl_vers u | u <- old_decl_vers] `thenM` \ recompile ->
971 returnM outOfDate -- This one failed, so just bail out now
973 up_to_date (ptext SLIT(" Great! The bits I use are up to date"))
976 ------------------------
977 checkModuleVersion old_mod_vers new_mod_vers
978 | new_mod_vers == old_mod_vers
979 = up_to_date (ptext SLIT("Module version unchanged"))
982 = out_of_date_vers (ptext SLIT(" Module version has changed"))
983 old_mod_vers new_mod_vers
985 ------------------------
986 checkExportList Nothing new_vers = upToDate
987 checkExportList (Just v) new_vers = v /= new_vers
989 ------------------------
990 checkEntityUsage new_vers (name,old_vers)
991 = case new_vers name of
993 Nothing -> -- We used it before, but it ain't there now
994 out_of_date (sep [ptext SLIT("No longer exported:"), ppr name])
996 Just (_, new_vers) -- It's there, but is it up to date?
997 | new_vers == old_vers -> traceHiDiffs (text " Up to date" <+> ppr name <+> parens (ppr new_vers)) `thenM_`
999 | otherwise -> out_of_date_vers (ptext SLIT(" Out of date:") <+> ppr name)
1002 up_to_date msg = traceHiDiffs msg `thenM_` returnM upToDate
1003 out_of_date msg = traceHiDiffs msg `thenM_` returnM outOfDate
1004 out_of_date_vers msg old_vers new_vers
1005 = out_of_date (hsep [msg, ppr old_vers, ptext SLIT("->"), ppr new_vers])
1007 ----------------------
1008 checkList :: [IfG RecompileRequired] -> IfG RecompileRequired
1009 -- This helper is used in two places
1010 checkList [] = returnM upToDate
1011 checkList (check:checks) = check `thenM` \ recompile ->
1018 %************************************************************************
1020 Converting things to their Iface equivalents
1022 %************************************************************************
1025 tyThingToIfaceDecl :: TyThing -> IfaceDecl
1026 -- Assumption: the thing is already tidied, so that locally-bound names
1027 -- (lambdas, for-alls) already have non-clashing OccNames
1028 -- Reason: Iface stuff uses OccNames, and the conversion here does
1029 -- not do tidying on the way
1030 tyThingToIfaceDecl (AnId id)
1031 = IfaceId { ifName = getOccName id,
1032 ifType = toIfaceType (idType id),
1035 info = case toIfaceIdInfo (idInfo id) of
1037 items -> HasInfo items
1039 tyThingToIfaceDecl (AClass clas)
1040 = IfaceClass { ifCtxt = toIfaceContext sc_theta,
1041 ifName = getOccName clas,
1042 ifTyVars = toIfaceTvBndrs clas_tyvars,
1043 ifFDs = map toIfaceFD clas_fds,
1044 ifATs = map (tyThingToIfaceDecl . ATyCon) clas_ats,
1045 ifSigs = map toIfaceClassOp op_stuff,
1046 ifRec = boolToRecFlag (isRecursiveTyCon tycon) }
1048 (clas_tyvars, clas_fds, sc_theta, _, clas_ats, op_stuff)
1049 = classExtraBigSig clas
1050 tycon = classTyCon clas
1052 toIfaceClassOp (sel_id, def_meth)
1053 = ASSERT(sel_tyvars == clas_tyvars)
1054 IfaceClassOp (getOccName sel_id) def_meth (toIfaceType op_ty)
1056 -- Be careful when splitting the type, because of things
1057 -- like class Foo a where
1058 -- op :: (?x :: String) => a -> a
1059 -- and class Baz a where
1060 -- op :: (Ord a) => a -> a
1061 (sel_tyvars, rho_ty) = splitForAllTys (idType sel_id)
1062 op_ty = funResultTy rho_ty
1064 toIfaceFD (tvs1, tvs2) = (map getFS tvs1, map getFS tvs2)
1066 tyThingToIfaceDecl (ATyCon tycon)
1068 = IfaceSyn { ifName = getOccName tycon,
1069 ifTyVars = toIfaceTvBndrs tyvars,
1070 ifOpenSyn = syn_isOpen,
1071 ifSynRhs = toIfaceType syn_tyki }
1074 = IfaceData { ifName = getOccName tycon,
1075 ifTyVars = toIfaceTvBndrs tyvars,
1076 ifCtxt = toIfaceContext (tyConStupidTheta tycon),
1077 ifCons = ifaceConDecls (algTyConRhs tycon),
1078 ifRec = boolToRecFlag (isRecursiveTyCon tycon),
1079 ifGadtSyntax = isGadtSyntaxTyCon tycon,
1080 ifGeneric = tyConHasGenerics tycon,
1081 ifFamInst = famInstToIface (tyConFamInst_maybe tycon)}
1083 | isForeignTyCon tycon
1084 = IfaceForeign { ifName = getOccName tycon,
1085 ifExtName = tyConExtName tycon }
1087 | otherwise = pprPanic "toIfaceDecl" (ppr tycon)
1089 tyvars = tyConTyVars tycon
1090 (syn_isOpen, syn_tyki) = case synTyConRhs tycon of
1091 OpenSynTyCon ki -> (True , ki)
1092 SynonymTyCon ty -> (False, ty)
1094 ifaceConDecls (NewTyCon { data_con = con }) =
1095 IfNewTyCon (ifaceConDecl con)
1096 ifaceConDecls (DataTyCon { data_cons = cons }) =
1097 IfDataTyCon (map ifaceConDecl cons)
1098 ifaceConDecls OpenDataTyCon = IfOpenDataTyCon
1099 ifaceConDecls OpenNewTyCon = IfOpenNewTyCon
1100 ifaceConDecls AbstractTyCon = IfAbstractTyCon
1101 -- The last case happens when a TyCon has been trimmed during tidying
1102 -- Furthermore, tyThingToIfaceDecl is also used
1103 -- in TcRnDriver for GHCi, when browsing a module, in which case the
1104 -- AbstractTyCon case is perfectly sensible.
1106 ifaceConDecl data_con
1107 = IfCon { ifConOcc = getOccName (dataConName data_con),
1108 ifConInfix = dataConIsInfix data_con,
1109 ifConUnivTvs = toIfaceTvBndrs (dataConUnivTyVars data_con),
1110 ifConExTvs = toIfaceTvBndrs (dataConExTyVars data_con),
1111 ifConEqSpec = to_eq_spec (dataConEqSpec data_con),
1112 ifConCtxt = toIfaceContext (dataConTheta data_con),
1113 ifConArgTys = map toIfaceType (dataConOrigArgTys data_con),
1114 ifConFields = map getOccName
1115 (dataConFieldLabels data_con),
1116 ifConStricts = dataConStrictMarks data_con }
1118 to_eq_spec spec = [(getOccName tv, toIfaceType ty) | (tv,ty) <- spec]
1120 famInstToIface Nothing = Nothing
1121 famInstToIface (Just (famTyCon, instTys)) =
1122 Just (toIfaceTyCon famTyCon, map toIfaceType instTys)
1124 tyThingToIfaceDecl (ADataCon dc)
1125 = pprPanic "toIfaceDecl" (ppr dc) -- Should be trimmed out earlier
1128 getFS x = occNameFS (getOccName x)
1130 --------------------------
1131 instanceToIfaceInst :: Instance -> IfaceInst
1132 instanceToIfaceInst ispec@(Instance { is_dfun = dfun_id, is_flag = oflag,
1133 is_cls = cls, is_tcs = mb_tcs,
1135 = IfaceInst { ifDFun = getName dfun_id,
1138 ifInstTys = map do_rough mb_tcs,
1141 do_rough Nothing = Nothing
1142 do_rough (Just n) = Just (toIfaceTyCon_name n)
1144 --------------------------
1145 famInstToIfaceFamInst :: FamInst -> IfaceFamInst
1146 famInstToIfaceFamInst fi@(FamInst { fi_tycon = tycon,
1147 fi_fam = fam, fi_tcs = mb_tcs })
1148 = IfaceFamInst { ifFamInstTyCon = toIfaceTyCon tycon
1149 , ifFamInstFam = fam
1150 , ifFamInstTys = map do_rough mb_tcs }
1152 do_rough Nothing = Nothing
1153 do_rough (Just n) = Just (toIfaceTyCon_name n)
1155 --------------------------
1156 toIfaceIdInfo :: IdInfo -> [IfaceInfoItem]
1157 toIfaceIdInfo id_info
1158 = catMaybes [arity_hsinfo, caf_hsinfo, strict_hsinfo,
1159 inline_hsinfo, wrkr_hsinfo, unfold_hsinfo]
1161 ------------ Arity --------------
1162 arity_info = arityInfo id_info
1163 arity_hsinfo | arity_info == 0 = Nothing
1164 | otherwise = Just (HsArity arity_info)
1166 ------------ Caf Info --------------
1167 caf_info = cafInfo id_info
1168 caf_hsinfo = case caf_info of
1169 NoCafRefs -> Just HsNoCafRefs
1172 ------------ Strictness --------------
1173 -- No point in explicitly exporting TopSig
1174 strict_hsinfo = case newStrictnessInfo id_info of
1175 Just sig | not (isTopSig sig) -> Just (HsStrictness sig)
1178 ------------ Worker --------------
1179 work_info = workerInfo id_info
1180 has_worker = case work_info of { HasWorker _ _ -> True; other -> False }
1181 wrkr_hsinfo = case work_info of
1182 HasWorker work_id wrap_arity ->
1183 Just (HsWorker ((idName work_id)) wrap_arity)
1186 ------------ Unfolding --------------
1187 -- The unfolding is redundant if there is a worker
1188 unfold_info = unfoldingInfo id_info
1189 rhs = unfoldingTemplate unfold_info
1190 no_unfolding = neverUnfold unfold_info
1191 -- The CoreTidy phase retains unfolding info iff
1192 -- we want to expose the unfolding, taking into account
1193 -- unconditional NOINLINE, etc. See TidyPgm.addExternal
1194 unfold_hsinfo | no_unfolding = Nothing
1195 | has_worker = Nothing -- Unfolding is implicit
1196 | otherwise = Just (HsUnfold (toIfaceExpr rhs))
1198 ------------ Inline prag --------------
1199 inline_prag = inlinePragInfo id_info
1200 inline_hsinfo | isAlwaysActive inline_prag = Nothing
1201 | no_unfolding && not has_worker = Nothing
1202 -- If the iface file give no unfolding info, we
1203 -- don't need to say when inlining is OK!
1204 | otherwise = Just (HsInline inline_prag)
1206 --------------------------
1207 coreRuleToIfaceRule :: CoreRule -> IfaceRule
1208 coreRuleToIfaceRule (BuiltinRule { ru_fn = fn})
1209 = pprTrace "toHsRule: builtin" (ppr fn) $
1212 coreRuleToIfaceRule (Rule { ru_name = name, ru_fn = fn,
1213 ru_act = act, ru_bndrs = bndrs,
1214 ru_args = args, ru_rhs = rhs, ru_orph = orph })
1215 = IfaceRule { ifRuleName = name, ifActivation = act,
1216 ifRuleBndrs = map toIfaceBndr bndrs,
1218 ifRuleArgs = map do_arg args,
1219 ifRuleRhs = toIfaceExpr rhs,
1222 -- For type args we must remove synonyms from the outermost
1223 -- level. Reason: so that when we read it back in we'll
1224 -- construct the same ru_rough field as we have right now;
1226 do_arg (Type ty) = IfaceType (toIfaceType (deNoteType ty))
1227 do_arg arg = toIfaceExpr arg
1229 bogusIfaceRule :: Name -> IfaceRule
1230 bogusIfaceRule id_name
1231 = IfaceRule { ifRuleName = FSLIT("bogus"), ifActivation = NeverActive,
1232 ifRuleBndrs = [], ifRuleHead = id_name, ifRuleArgs = [],
1233 ifRuleRhs = IfaceExt id_name, ifRuleOrph = Nothing }
1235 ---------------------
1236 toIfaceExpr :: CoreExpr -> IfaceExpr
1237 toIfaceExpr (Var v) = toIfaceVar v
1238 toIfaceExpr (Lit l) = IfaceLit l
1239 toIfaceExpr (Type ty) = IfaceType (toIfaceType ty)
1240 toIfaceExpr (Lam x b) = IfaceLam (toIfaceBndr x) (toIfaceExpr b)
1241 toIfaceExpr (App f a) = toIfaceApp f [a]
1242 toIfaceExpr (Case s x ty as) = IfaceCase (toIfaceExpr s) (getFS x) (toIfaceType ty) (map toIfaceAlt as)
1243 toIfaceExpr (Let b e) = IfaceLet (toIfaceBind b) (toIfaceExpr e)
1244 toIfaceExpr (Cast e co) = IfaceCast (toIfaceExpr e) (toIfaceType co)
1245 toIfaceExpr (Note n e) = IfaceNote (toIfaceNote n) (toIfaceExpr e)
1247 ---------------------
1248 toIfaceNote (SCC cc) = IfaceSCC cc
1249 toIfaceNote InlineMe = IfaceInlineMe
1250 toIfaceNote (CoreNote s) = IfaceCoreNote s
1252 ---------------------
1253 toIfaceBind (NonRec b r) = IfaceNonRec (toIfaceIdBndr b) (toIfaceExpr r)
1254 toIfaceBind (Rec prs) = IfaceRec [(toIfaceIdBndr b, toIfaceExpr r) | (b,r) <- prs]
1256 ---------------------
1257 toIfaceAlt (c,bs,r) = (toIfaceCon c, map getFS bs, toIfaceExpr r)
1259 ---------------------
1260 toIfaceCon (DataAlt dc) | isTupleTyCon tc = IfaceTupleAlt (tupleTyConBoxity tc)
1261 | otherwise = IfaceDataAlt (getName dc)
1263 tc = dataConTyCon dc
1265 toIfaceCon (LitAlt l) = IfaceLitAlt l
1266 toIfaceCon DEFAULT = IfaceDefault
1268 ---------------------
1269 toIfaceApp (App f a) as = toIfaceApp f (a:as)
1270 toIfaceApp (Var v) as
1271 = case isDataConWorkId_maybe v of
1272 -- We convert the *worker* for tuples into IfaceTuples
1273 Just dc | isTupleTyCon tc && saturated
1274 -> IfaceTuple (tupleTyConBoxity tc) tup_args
1276 val_args = dropWhile isTypeArg as
1277 saturated = val_args `lengthIs` idArity v
1278 tup_args = map toIfaceExpr val_args
1279 tc = dataConTyCon dc
1281 other -> mkIfaceApps (toIfaceVar v) as
1283 toIfaceApp e as = mkIfaceApps (toIfaceExpr e) as
1285 mkIfaceApps f as = foldl (\f a -> IfaceApp f (toIfaceExpr a)) f as
1287 ---------------------
1288 toIfaceVar :: Id -> IfaceExpr
1290 | Just fcall <- isFCallId_maybe v = IfaceFCall fcall (toIfaceType (idType v))
1291 -- Foreign calls have special syntax
1292 | isExternalName name = IfaceExt name
1293 | otherwise = IfaceLcl (getFS name)