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 let name = getName entity,
261 not (isImplicitTyThing entity),
262 -- No implicit Ids and class tycons in the interface file
263 not (isWiredInName name),
264 -- Nor wired-in things; the compiler knows about them anyhow
265 nameIsLocalOrFrom this_mod name ]
266 -- Sigh: see Note [Root-main Id] in TcRnDriver
268 ; fixities = [(occ,fix) | FixItem occ fix _ <- nameEnvElts fix_env]
269 ; deprecs = mkIfaceDeprec src_deprecs
270 ; iface_rules = map coreRuleToIfaceRule rules
271 ; iface_insts = map instanceToIfaceInst insts
272 ; iface_fam_insts = map famInstToIfaceFamInst fam_insts
274 ; intermediate_iface = ModIface {
275 mi_module = this_mod,
279 mi_exports = mkIfaceExports exports,
281 -- Sort these lexicographically, so that
282 -- the result is stable across compilations
283 mi_insts = sortLe le_inst iface_insts,
284 mi_fam_insts= sortLe le_fam_inst iface_fam_insts,
285 mi_rules = sortLe le_rule iface_rules,
287 mi_fixities = fixities,
288 mi_deprecs = deprecs,
289 mi_globals = Just rdr_env,
291 -- Left out deliberately: filled in by addVersionInfo
292 mi_mod_vers = initialVersion,
293 mi_exp_vers = initialVersion,
294 mi_rule_vers = initialVersion,
295 mi_orphan = False, -- Always set by addVersionInfo, but
296 -- it's a strict field, so we can't omit it.
297 mi_finsts = False, -- Ditto
298 mi_decls = deliberatelyOmitted "decls",
299 mi_ver_fn = deliberatelyOmitted "ver_fn",
301 -- And build the cached values
302 mi_dep_fn = mkIfaceDepCache deprecs,
303 mi_fix_fn = mkIfaceFixCache fixities }
305 -- Add version information
306 ; ext_ver_fn = mkParentVerFun hsc_env eps
307 ; (new_iface, no_change_at_all, pp_diffs, pp_orphs)
308 = _scc_ "versioninfo"
309 addVersionInfo ext_ver_fn maybe_old_iface
310 intermediate_iface decls
314 ; when (isJust pp_orphs && dopt Opt_WarnOrphans dflags)
315 (printDump (expectJust "mkIface" pp_orphs))
316 ; when (dopt Opt_D_dump_hi_diffs dflags) (printDump pp_diffs)
317 ; dumpIfSet_dyn dflags Opt_D_dump_hi "FINAL INTERFACE"
318 (pprModIface new_iface)
320 ; return (new_iface, no_change_at_all) }
322 r1 `le_rule` r2 = ifRuleName r1 <= ifRuleName r2
323 i1 `le_inst` i2 = ifDFun i1 `le_occ` ifDFun i2
324 i1 `le_fam_inst` i2 = ifFamInstTcName i1 `le_occ` ifFamInstTcName i2
326 le_occ :: Name -> Name -> Bool
327 -- Compare lexicographically by OccName, *not* by unique, because
328 -- the latter is not stable across compilations
329 le_occ n1 n2 = nameOccName n1 <= nameOccName n2
331 dflags = hsc_dflags hsc_env
332 deliberatelyOmitted x = panic ("Deliberately omitted: " ++ x)
333 ifFamInstTcName = ifaceTyConName . ifFamInstTyCon
336 -----------------------------
337 writeIfaceFile :: DynFlags -> ModLocation -> ModIface -> IO ()
338 writeIfaceFile dflags location new_iface
339 = do createDirectoryHierarchy (directoryOf hi_file_path)
340 writeBinIface dflags hi_file_path new_iface
341 where hi_file_path = ml_hi_file location
344 -- -----------------------------------------------------------------------------
345 -- Look up parents and versions of Names
347 -- This is like a global version of the mi_ver_fn field in each ModIface.
348 -- Given a Name, it finds the ModIface, and then uses mi_ver_fn to get
349 -- the parent and version info.
352 :: HscEnv -- needed to look up versions
353 -> ExternalPackageState -- ditto
354 -> (Name -> (OccName,Version))
355 mkParentVerFun hsc_env eps
358 mod = nameModule name
359 occ = nameOccName name
360 iface = lookupIfaceByModule (hsc_dflags hsc_env) hpt pit mod `orElse`
361 pprPanic "lookupVers2" (ppr mod <+> ppr occ)
363 mi_ver_fn iface occ `orElse`
364 pprPanic "lookupVers1" (ppr mod <+> ppr occ)
366 hpt = hsc_HPT hsc_env
369 -----------------------------------------------------------------------------
370 -- Compute version numbers for local decls
373 :: (Name -> (OccName,Version)) -- lookup parents and versions of names
374 -> Maybe ModIface -- The old interface, read from M.hi
375 -> ModIface -- The new interface (lacking decls)
376 -> [IfaceDecl] -- The new decls
377 -> (ModIface, -- Updated interface
378 Bool, -- True <=> no changes at all; no need to write Iface
380 Maybe SDoc) -- Warnings about orphans
382 addVersionInfo ver_fn Nothing new_iface new_decls
383 -- No old interface, so definitely write a new one!
384 = (new_iface { mi_orphan = anyNothing ifInstOrph (mi_insts new_iface)
385 || anyNothing ifRuleOrph (mi_rules new_iface)
386 , mi_finsts = not . null $ mi_fam_insts new_iface
387 , mi_decls = [(initialVersion, decl) | decl <- new_decls]
388 , mi_ver_fn = mkIfaceVerCache (zip (repeat initialVersion)
392 ptext SLIT("No old interface file"),
393 pprOrphans orph_insts orph_rules)
395 orph_insts = filter (isNothing . ifInstOrph) (mi_insts new_iface)
396 orph_rules = filter (isNothing . ifRuleOrph) (mi_rules new_iface)
398 addVersionInfo ver_fn (Just old_iface@(ModIface {
399 mi_mod_vers = old_mod_vers,
400 mi_exp_vers = old_exp_vers,
401 mi_rule_vers = old_rule_vers,
402 mi_decls = old_decls,
403 mi_ver_fn = old_decl_vers,
404 mi_fix_fn = old_fixities }))
405 new_iface@(ModIface { mi_fix_fn = new_fixities })
408 = (old_iface, True, ptext SLIT("Interface file unchanged"), pp_orphs)
410 = (final_iface, False, vcat [ptext SLIT("Interface file has changed"),
411 nest 2 pp_diffs], pp_orphs)
413 final_iface = new_iface {
414 mi_mod_vers = bump_unless no_output_change old_mod_vers,
415 mi_exp_vers = bump_unless no_export_change old_exp_vers,
416 mi_rule_vers = bump_unless no_rule_change old_rule_vers,
417 mi_orphan = not (null new_orph_rules && null new_orph_insts),
418 mi_finsts = not . null $ mi_fam_insts new_iface,
419 mi_decls = decls_w_vers,
420 mi_ver_fn = mkIfaceVerCache decls_w_vers }
422 decls_w_vers = [(add_vers decl, decl) | decl <- new_decls]
425 (old_non_orph_insts, old_orph_insts) =
426 mkOrphMap ifInstOrph (mi_insts old_iface)
427 (new_non_orph_insts, new_orph_insts) =
428 mkOrphMap ifInstOrph (mi_insts new_iface)
429 old_fam_insts = mi_fam_insts old_iface
430 new_fam_insts = mi_fam_insts new_iface
431 same_insts occ = eqMaybeBy (eqListBy eqIfInst)
432 (lookupOccEnv old_non_orph_insts occ)
433 (lookupOccEnv new_non_orph_insts occ)
435 (old_non_orph_rules, old_orph_rules) =
436 mkOrphMap ifRuleOrph (mi_rules old_iface)
437 (new_non_orph_rules, new_orph_rules) =
438 mkOrphMap ifRuleOrph (mi_rules new_iface)
439 same_rules occ = eqMaybeBy (eqListBy eqIfRule)
440 (lookupOccEnv old_non_orph_rules occ)
441 (lookupOccEnv new_non_orph_rules occ)
443 -- Computing what changed
444 no_output_change = no_decl_change && no_rule_change &&
445 no_export_change && no_deprec_change
446 no_export_change = mi_exports new_iface == mi_exports old_iface
448 no_decl_change = isEmptyOccSet changed_occs
449 no_rule_change = not (changedWrtNames changed_occs (eqListBy eqIfRule old_orph_rules new_orph_rules)
450 || changedWrtNames changed_occs (eqListBy eqIfInst old_orph_insts new_orph_insts)
451 || changedWrtNames changed_occs (eqListBy eqIfFamInst old_fam_insts new_fam_insts))
452 no_deprec_change = mi_deprecs new_iface == mi_deprecs old_iface
454 -- If the usages havn't changed either, we don't need to write the interface file
455 no_other_changes = mi_usages new_iface == mi_usages old_iface &&
456 mi_deps new_iface == mi_deps old_iface
457 no_change_at_all = no_output_change && no_other_changes
459 pp_diffs = vcat [pp_change no_export_change "Export list"
460 (ppr old_exp_vers <+> arrow <+> ppr (mi_exp_vers final_iface)),
461 pp_change no_rule_change "Rules"
462 (ppr old_rule_vers <+> arrow <+> ppr (mi_rule_vers final_iface)),
463 pp_change no_deprec_change "Deprecations" empty,
464 pp_change no_other_changes "Usages" empty,
466 pp_change True what info = empty
467 pp_change False what info = text what <+> ptext SLIT("changed") <+> info
470 old_decl_env = mkOccEnv [(ifName decl, decl) | (_,decl) <- old_decls]
471 same_fixity n = bool (old_fixities n == new_fixities n)
474 -- Adding version info
475 new_version = bumpVersion old_mod_vers
476 -- Start from the old module version, not from
477 -- zero so that if you remove f, and then add
478 -- it again, you don't thereby reduce f's
481 add_vers decl | occ `elemOccSet` changed_occs = new_version
482 | otherwise = snd (expectJust "add_vers" (old_decl_vers occ))
483 -- If it's unchanged, there jolly well
484 where -- should be an old version number
488 -- Deciding which declarations have changed
490 -- For each local decl, the IfaceEq gives the list of things that
491 -- must be unchanged for the declaration as a whole to be unchanged.
492 eq_info :: [(OccName, IfaceEq)]
493 eq_info = map check_eq new_decls
495 | Just old_decl <- lookupOccEnv old_decl_env occ
496 = (occ, new_decl `eqIfDecl` old_decl &&& eq_indirects new_decl)
497 | otherwise {- No corresponding old decl -}
500 occ = ifName new_decl
502 eq_indirects :: IfaceDecl -> IfaceEq
503 -- When seeing if two decls are the same, remember to
504 -- check whether any relevant fixity or rules have changed
505 eq_indirects (IfaceId {ifName = occ}) = eq_ind_occ occ
506 eq_indirects (IfaceClass {ifName = cls_occ, ifSigs = sigs})
507 = same_insts cls_occ &&&
508 eq_ind_occs [op | IfaceClassOp op _ _ <- sigs]
509 eq_indirects (IfaceData {ifName = tc_occ, ifCons = cons})
510 = same_insts tc_occ &&& same_fixity tc_occ &&& -- The TyCon can have a fixity too
511 eq_ind_occs (map ifConOcc (visibleIfConDecls cons))
512 eq_indirects other = Equal -- Synonyms and foreign declarations
514 eq_ind_occ :: OccName -> IfaceEq -- For class ops and Ids; check fixity and rules
515 eq_ind_occ occ = same_fixity occ &&& same_rules occ
516 eq_ind_occs = foldr ((&&&) . eq_ind_occ) Equal
518 -- The Occs of declarations that changed.
519 changed_occs :: OccSet
520 changed_occs = computeChangedOccs ver_fn (mi_module new_iface)
521 (mi_usages old_iface) eq_info
525 pp_decl_diffs :: SDoc -- Nothing => no changes
527 | isEmptyOccSet changed_occs = empty
529 = vcat [ptext SLIT("Changed occs:") <+> ppr (occSetElts changed_occs),
530 ptext SLIT("Version change for these decls:"),
531 nest 2 (vcat (map show_change new_decls))]
533 eq_env = mkOccEnv eq_info
535 | not (occ `elemOccSet` changed_occs) = empty
537 = vcat [ppr occ <+> ppr (old_decl_vers occ) <+> arrow <+> ppr new_version,
540 occ = ifName new_decl
541 why = case lookupOccEnv eq_env occ of
542 Just (EqBut names) -> sep [ppr occ <> colon, ptext SLIT("Free vars (only) changed:"),
543 nest 2 (braces (fsep (map ppr (occSetElts
544 (occs `intersectOccSet` changed_occs)))))]
545 where occs = mkOccSet (map nameOccName (nameSetToList names))
547 | Just old_decl <- lookupOccEnv old_decl_env occ
548 -> vcat [ptext SLIT("Old:") <+> ppr old_decl,
549 ptext SLIT("New:") <+> ppr new_decl]
551 -> ppr occ <+> ptext SLIT("only in new interface")
552 other -> pprPanic "MkIface.show_change" (ppr occ)
554 pp_orphs = pprOrphans new_orph_insts new_orph_rules
557 pprOrphans insts rules
558 | null insts && null rules = Nothing
561 if null insts then empty else
562 hang (ptext SLIT("Warning: orphan instances:"))
563 2 (vcat (map ppr insts)),
564 if null rules then empty else
565 hang (ptext SLIT("Warning: orphan rules:"))
566 2 (vcat (map ppr rules))
570 :: (Name -> (OccName,Version)) -- get parents and versions
571 -> Module -- This module
572 -> [Usage] -- Usages from old iface
573 -> [(OccName, IfaceEq)] -- decl names, equality conditions
574 -> OccSet -- set of things that have changed
575 computeChangedOccs ver_fn this_module old_usages eq_info
576 = foldl add_changes emptyOccSet (stronglyConnComp edges)
579 -- return True if an external name has changed
580 name_changed :: Name -> Bool
582 | Just ents <- lookupUFM usg_modmap (moduleName mod)
583 = case lookupUFM ents parent_occ of
584 Nothing -> pprPanic "computeChangedOccs" (ppr nm)
585 Just v -> v < new_version
586 | otherwise = False -- must be in another package
589 (parent_occ, new_version) = ver_fn nm
591 -- Turn the usages from the old ModIface into a mapping
592 usg_modmap = listToUFM [ (usg_mod usg, listToUFM (usg_entities usg))
593 | usg <- old_usages ]
595 get_local_eq_info :: GenIfaceEq NameSet -> GenIfaceEq OccSet
596 get_local_eq_info Equal = Equal
597 get_local_eq_info NotEqual = NotEqual
598 get_local_eq_info (EqBut ns) = foldNameSet f Equal ns
599 where f name eq | nameModule name == this_module =
600 EqBut (unitOccSet (nameOccName name)) `and_occifeq` eq
601 | name_changed name = NotEqual
604 local_eq_infos = mapSnd get_local_eq_info eq_info
606 edges :: [((OccName, OccIfaceEq), Unique, [Unique])]
607 edges = [ (node, getUnique occ, map getUnique occs)
608 | node@(occ, iface_eq) <- local_eq_infos
609 , let occs = case iface_eq of
610 EqBut occ_set -> occSetElts occ_set
613 -- Changes in declarations
614 add_changes :: OccSet -> SCC (OccName, OccIfaceEq) -> OccSet
615 add_changes so_far (AcyclicSCC (occ, iface_eq))
616 | changedWrt so_far iface_eq -- This one has changed
617 = extendOccSet so_far occ
618 add_changes so_far (CyclicSCC pairs)
619 | changedWrt so_far (foldr1 and_occifeq iface_eqs)
620 -- One of this group has changed
621 = extendOccSetList so_far occs
622 where (occs, iface_eqs) = unzip pairs
623 add_changes so_far other = so_far
625 type OccIfaceEq = GenIfaceEq OccSet
627 changedWrt :: OccSet -> OccIfaceEq -> Bool
628 changedWrt so_far Equal = False
629 changedWrt so_far NotEqual = True
630 changedWrt so_far (EqBut kids) = so_far `intersectsOccSet` kids
632 changedWrtNames :: OccSet -> IfaceEq -> Bool
633 changedWrtNames so_far Equal = False
634 changedWrtNames so_far NotEqual = True
635 changedWrtNames so_far (EqBut kids) =
636 so_far `intersectsOccSet` mkOccSet (map nameOccName (nameSetToList kids))
638 and_occifeq :: OccIfaceEq -> OccIfaceEq -> OccIfaceEq
639 Equal `and_occifeq` x = x
640 NotEqual `and_occifeq` x = NotEqual
641 EqBut nms `and_occifeq` Equal = EqBut nms
642 EqBut nms `and_occifeq` NotEqual = NotEqual
643 EqBut nms1 `and_occifeq` EqBut nms2 = EqBut (nms1 `unionOccSets` nms2)
645 ----------------------
646 -- mkOrphMap partitions instance decls or rules into
647 -- (a) an OccEnv for ones that are not orphans,
648 -- mapping the local OccName to a list of its decls
649 -- (b) a list of orphan decls
650 mkOrphMap :: (decl -> Maybe OccName) -- (Just occ) for a non-orphan decl, keyed by occ
651 -- Nothing for an orphan decl
652 -> [decl] -- Sorted into canonical order
653 -> (OccEnv [decl], -- Non-orphan decls associated with their key;
654 -- each sublist in canonical order
655 [decl]) -- Orphan decls; in canonical order
656 mkOrphMap get_key decls
657 = foldl go (emptyOccEnv, []) decls
659 go (non_orphs, orphs) d
660 | Just occ <- get_key d
661 = (extendOccEnv_C (\ ds _ -> d:ds) non_orphs occ [d], orphs)
662 | otherwise = (non_orphs, d:orphs)
664 anyNothing :: (a -> Maybe b) -> [a] -> Bool
665 anyNothing p [] = False
666 anyNothing p (x:xs) = isNothing (p x) || anyNothing p xs
668 ----------------------
669 mkIfaceDeprec :: Deprecations -> IfaceDeprecs
670 mkIfaceDeprec NoDeprecs = NoDeprecs
671 mkIfaceDeprec (DeprecAll t) = DeprecAll t
672 mkIfaceDeprec (DeprecSome env) = DeprecSome (sortLe (<=) (nameEnvElts env))
674 ----------------------
675 bump_unless :: Bool -> Version -> Version
676 bump_unless True v = v -- True <=> no change
677 bump_unless False v = bumpVersion v
681 %*********************************************************
683 \subsection{Keeping track of what we've slurped, and version numbers}
685 %*********************************************************
689 mkUsageInfo :: HscEnv
690 -> ModuleEnv (Module, Bool, SrcSpan)
691 -> [(ModuleName, IsBootInterface)]
692 -> NameSet -> IO [Usage]
693 mkUsageInfo hsc_env dir_imp_mods dep_mods used_names
694 = do { eps <- hscEPS hsc_env
695 ; let usages = mk_usage_info (eps_PIT eps) hsc_env
696 dir_imp_mods dep_mods used_names
697 ; usages `seqList` return usages }
698 -- seq the list of Usages returned: occasionally these
699 -- don't get evaluated for a while and we can end up hanging on to
700 -- the entire collection of Ifaces.
702 mk_usage_info pit hsc_env dir_imp_mods dep_mods used_names
703 = mapCatMaybes mkUsage dep_mods
704 -- ToDo: do we need to sort into canonical order?
706 hpt = hsc_HPT hsc_env
707 dflags = hsc_dflags hsc_env
709 -- ent_map groups together all the things imported and used
710 -- from a particular module in this package
711 ent_map :: ModuleEnv [OccName]
712 ent_map = foldNameSet add_mv emptyModuleEnv used_names
714 | isWiredInName name = mv_map -- ignore wired-in names
716 = case nameModule_maybe name of
717 Nothing -> mv_map -- ignore internal names
718 Just mod -> extendModuleEnv_C add_item mv_map mod [occ]
720 occ = nameOccName name
721 add_item occs _ = occ:occs
723 depend_on_exports mod = case lookupModuleEnv dir_imp_mods mod of
724 Just (_,no_imp,_) -> not no_imp
727 -- We want to create a Usage for a home module if
728 -- a) we used something from; has something in used_names
729 -- b) we imported all of it, even if we used nothing from it
730 -- (need to recompile if its export list changes: export_vers)
731 -- c) is a home-package orphan or family-instance module (need to
732 -- recompile if its instance decls change: rules_vers)
733 mkUsage :: (ModuleName, IsBootInterface) -> Maybe Usage
734 mkUsage (mod_name, _)
735 | isNothing maybe_iface -- We can't depend on it if we didn't
736 || (null used_occs -- load its interface.
737 && isNothing export_vers
740 = Nothing -- Record no usage info
743 = Just (Usage { usg_name = mod_name,
745 usg_exports = export_vers,
746 usg_entities = fmToList ent_vers,
747 usg_rules = rules_vers })
749 maybe_iface = lookupIfaceByModule dflags hpt pit mod
750 -- In one-shot mode, the interfaces for home-package
751 -- modules accumulate in the PIT not HPT. Sigh.
753 mod = mkModule (thisPackage dflags) mod_name
755 Just iface = maybe_iface
756 orphan_mod = mi_orphan iface
757 finsts_mod = mi_finsts iface
758 version_env = mi_ver_fn iface
759 mod_vers = mi_mod_vers iface
760 rules_vers = mi_rule_vers iface
761 export_vers | depend_on_exports mod = Just (mi_exp_vers iface)
762 | otherwise = Nothing
764 used_occs = lookupModuleEnv ent_map mod `orElse` []
766 -- Making a FiniteMap here ensures that (a) we remove duplicates
767 -- when we have usages on several subordinates of a single parent,
768 -- and (b) that the usages emerge in a canonical order, which
769 -- is why we use FiniteMap rather than OccEnv: FiniteMap works
770 -- using Ord on the OccNames, which is a lexicographic ordering.
771 ent_vers :: FiniteMap OccName Version
772 ent_vers = listToFM (map lookup_occ used_occs)
775 case version_env occ of
776 Nothing -> pprTrace "hmm, strange" (ppr mod <+> ppr occ) $
777 (occ, initialVersion) -- does this ever happen?
778 Just (parent, version) -> (parent, version)
782 mkIfaceExports :: [AvailInfo]
783 -> [(Module, [GenAvailInfo OccName])]
784 -- Group by module and sort by occurrence
785 -- This keeps the list in canonical order
786 mkIfaceExports exports
787 = [ (mod, eltsFM avails)
788 | (mod, avails) <- fmToList groupFM
791 -- Deliberately use FiniteMap rather than UniqFM so we
792 -- get a canonical ordering
793 groupFM :: ModuleEnv (FiniteMap FastString (GenAvailInfo OccName))
794 groupFM = foldl add emptyModuleEnv exports
797 = extendModuleEnv_C add_avail env mod (unitFM avail_fs avail_occ)
799 avail_occ = availToOccs avail
800 mod = nameModule (availName avail)
801 avail_fs = occNameFS (availName avail_occ)
802 add_avail avail_fm _ = addToFM avail_fm avail_fs avail_occ
804 availToOccs (Avail n) = Avail (nameOccName n)
805 availToOccs (AvailTC tc ns) = AvailTC (nameOccName tc) (map nameOccName ns)
809 %************************************************************************
811 Load the old interface file for this module (unless
812 we have it aleady), and check whether it is up to date
815 %************************************************************************
818 checkOldIface :: HscEnv
820 -> Bool -- Source unchanged
821 -> Maybe ModIface -- Old interface from compilation manager, if any
822 -> IO (RecompileRequired, Maybe ModIface)
824 checkOldIface hsc_env mod_summary source_unchanged maybe_iface
825 = do { showPass (hsc_dflags hsc_env)
826 ("Checking old interface for " ++
827 showSDoc (ppr (ms_mod mod_summary))) ;
829 ; initIfaceCheck hsc_env $
830 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
833 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
834 = do -- CHECK WHETHER THE SOURCE HAS CHANGED
835 { ifM (not source_unchanged)
836 (traceHiDiffs (nest 4 (text "Source file changed or recompilation check turned off")))
838 -- If the source has changed and we're in interactive mode, avoid reading
839 -- an interface; just return the one we might have been supplied with.
840 ; ghc_mode <- getGhcMode
841 ; if (ghc_mode == Interactive || ghc_mode == JustTypecheck)
842 && not source_unchanged then
843 return (outOfDate, maybe_iface)
845 case maybe_iface of {
846 Just old_iface -> do -- Use the one we already have
847 { traceIf (text "We already have the old interface for" <+> ppr (ms_mod mod_summary))
848 ; recomp <- checkVersions hsc_env source_unchanged old_iface
849 ; return (recomp, Just old_iface) }
853 -- Try and read the old interface for the current module
854 -- from the .hi file left from the last time we compiled it
855 { let iface_path = msHiFilePath mod_summary
856 ; read_result <- readIface (ms_mod mod_summary) iface_path False
857 ; case read_result of {
858 Failed err -> do -- Old interface file not found, or garbled; give up
859 { traceIf (text "FYI: cannot read old interface file:"
861 ; return (outOfDate, Nothing) }
863 ; Succeeded iface -> do
865 -- We have got the old iface; check its versions
866 { traceIf (text "Read the interface file" <+> text iface_path)
867 ; recomp <- checkVersions hsc_env source_unchanged iface
868 ; returnM (recomp, Just iface)
872 @recompileRequired@ is called from the HscMain. It checks whether
873 a recompilation is required. It needs access to the persistent state,
874 finder, etc, because it may have to load lots of interface files to
875 check their versions.
878 type RecompileRequired = Bool
879 upToDate = False -- Recompile not required
880 outOfDate = True -- Recompile required
882 checkVersions :: HscEnv
883 -> Bool -- True <=> source unchanged
884 -> ModIface -- Old interface
885 -> IfG RecompileRequired
886 checkVersions hsc_env source_unchanged iface
887 | not source_unchanged
890 = do { traceHiDiffs (text "Considering whether compilation is required for" <+>
891 ppr (mi_module iface) <> colon)
893 -- Source code unchanged and no errors yet... carry on
895 -- First put the dependent-module info, read from the old interface, into the envt,
896 -- so that when we look for interfaces we look for the right one (.hi or .hi-boot)
898 -- It's just temporary because either the usage check will succeed
899 -- (in which case we are done with this module) or it'll fail (in which
900 -- case we'll compile the module from scratch anyhow).
902 -- We do this regardless of compilation mode, although in --make mode
903 -- all the dependent modules should be in the HPT already, so it's
905 ; updateEps_ $ \eps -> eps { eps_is_boot = mod_deps }
907 ; let this_pkg = thisPackage (hsc_dflags hsc_env)
908 ; checkList [checkModUsage this_pkg u | u <- mi_usages iface]
911 -- This is a bit of a hack really
912 mod_deps :: ModuleNameEnv (ModuleName, IsBootInterface)
913 mod_deps = mkModDeps (dep_mods (mi_deps iface))
915 checkModUsage :: PackageId ->Usage -> IfG RecompileRequired
916 -- Given the usage information extracted from the old
917 -- M.hi file for the module being compiled, figure out
918 -- whether M needs to be recompiled.
920 checkModUsage this_pkg (Usage { usg_name = mod_name, usg_mod = old_mod_vers,
921 usg_rules = old_rule_vers,
922 usg_exports = maybe_old_export_vers,
923 usg_entities = old_decl_vers })
924 = -- Load the imported interface is possible
926 doc_str = sep [ptext SLIT("need version info for"), ppr mod_name]
928 traceHiDiffs (text "Checking usages for module" <+> ppr mod_name) `thenM_`
931 mod = mkModule this_pkg mod_name
933 loadInterface doc_str mod ImportBySystem `thenM` \ mb_iface ->
934 -- Load the interface, but don't complain on failure;
935 -- Instead, get an Either back which we can test
938 Failed exn -> (out_of_date (sep [ptext SLIT("Can't find version number for module"),
940 -- Couldn't find or parse a module mentioned in the
941 -- old interface file. Don't complain -- it might just be that
942 -- the current module doesn't need that import and it's been deleted
946 new_mod_vers = mi_mod_vers iface
947 new_decl_vers = mi_ver_fn iface
948 new_export_vers = mi_exp_vers iface
949 new_rule_vers = mi_rule_vers iface
952 checkModuleVersion old_mod_vers new_mod_vers `thenM` \ recompile ->
953 if not recompile then
958 if checkExportList maybe_old_export_vers new_export_vers then
959 out_of_date_vers (ptext SLIT(" Export list changed"))
960 (expectJust "checkModUsage" maybe_old_export_vers)
965 if old_rule_vers /= new_rule_vers then
966 out_of_date_vers (ptext SLIT(" Rules changed"))
967 old_rule_vers new_rule_vers
970 -- CHECK ITEMS ONE BY ONE
971 checkList [checkEntityUsage new_decl_vers u | u <- old_decl_vers] `thenM` \ recompile ->
973 returnM outOfDate -- This one failed, so just bail out now
975 up_to_date (ptext SLIT(" Great! The bits I use are up to date"))
978 ------------------------
979 checkModuleVersion old_mod_vers new_mod_vers
980 | new_mod_vers == old_mod_vers
981 = up_to_date (ptext SLIT("Module version unchanged"))
984 = out_of_date_vers (ptext SLIT(" Module version has changed"))
985 old_mod_vers new_mod_vers
987 ------------------------
988 checkExportList Nothing new_vers = upToDate
989 checkExportList (Just v) new_vers = v /= new_vers
991 ------------------------
992 checkEntityUsage new_vers (name,old_vers)
993 = case new_vers name of
995 Nothing -> -- We used it before, but it ain't there now
996 out_of_date (sep [ptext SLIT("No longer exported:"), ppr name])
998 Just (_, new_vers) -- It's there, but is it up to date?
999 | new_vers == old_vers -> traceHiDiffs (text " Up to date" <+> ppr name <+> parens (ppr new_vers)) `thenM_`
1001 | otherwise -> out_of_date_vers (ptext SLIT(" Out of date:") <+> ppr name)
1004 up_to_date msg = traceHiDiffs msg `thenM_` returnM upToDate
1005 out_of_date msg = traceHiDiffs msg `thenM_` returnM outOfDate
1006 out_of_date_vers msg old_vers new_vers
1007 = out_of_date (hsep [msg, ppr old_vers, ptext SLIT("->"), ppr new_vers])
1009 ----------------------
1010 checkList :: [IfG RecompileRequired] -> IfG RecompileRequired
1011 -- This helper is used in two places
1012 checkList [] = returnM upToDate
1013 checkList (check:checks) = check `thenM` \ recompile ->
1020 %************************************************************************
1022 Converting things to their Iface equivalents
1024 %************************************************************************
1027 tyThingToIfaceDecl :: TyThing -> IfaceDecl
1028 -- Assumption: the thing is already tidied, so that locally-bound names
1029 -- (lambdas, for-alls) already have non-clashing OccNames
1030 -- Reason: Iface stuff uses OccNames, and the conversion here does
1031 -- not do tidying on the way
1032 tyThingToIfaceDecl (AnId id)
1033 = IfaceId { ifName = getOccName id,
1034 ifType = toIfaceType (idType id),
1037 info = case toIfaceIdInfo (idInfo id) of
1039 items -> HasInfo items
1041 tyThingToIfaceDecl (AClass clas)
1042 = IfaceClass { ifCtxt = toIfaceContext sc_theta,
1043 ifName = getOccName clas,
1044 ifTyVars = toIfaceTvBndrs clas_tyvars,
1045 ifFDs = map toIfaceFD clas_fds,
1046 ifATs = map (tyThingToIfaceDecl . ATyCon) clas_ats,
1047 ifSigs = map toIfaceClassOp op_stuff,
1048 ifRec = boolToRecFlag (isRecursiveTyCon tycon) }
1050 (clas_tyvars, clas_fds, sc_theta, _, clas_ats, op_stuff)
1051 = classExtraBigSig clas
1052 tycon = classTyCon clas
1054 toIfaceClassOp (sel_id, def_meth)
1055 = ASSERT(sel_tyvars == clas_tyvars)
1056 IfaceClassOp (getOccName sel_id) def_meth (toIfaceType op_ty)
1058 -- Be careful when splitting the type, because of things
1059 -- like class Foo a where
1060 -- op :: (?x :: String) => a -> a
1061 -- and class Baz a where
1062 -- op :: (Ord a) => a -> a
1063 (sel_tyvars, rho_ty) = splitForAllTys (idType sel_id)
1064 op_ty = funResultTy rho_ty
1066 toIfaceFD (tvs1, tvs2) = (map getFS tvs1, map getFS tvs2)
1068 tyThingToIfaceDecl (ATyCon tycon)
1070 = IfaceSyn { ifName = getOccName tycon,
1071 ifTyVars = toIfaceTvBndrs tyvars,
1072 ifOpenSyn = syn_isOpen,
1073 ifSynRhs = toIfaceType syn_tyki }
1076 = IfaceData { ifName = getOccName tycon,
1077 ifTyVars = toIfaceTvBndrs tyvars,
1078 ifCtxt = toIfaceContext (tyConStupidTheta tycon),
1079 ifCons = ifaceConDecls (algTyConRhs tycon),
1080 ifRec = boolToRecFlag (isRecursiveTyCon tycon),
1081 ifGadtSyntax = isGadtSyntaxTyCon tycon,
1082 ifGeneric = tyConHasGenerics tycon,
1083 ifFamInst = famInstToIface (tyConFamInst_maybe tycon)}
1085 | isForeignTyCon tycon
1086 = IfaceForeign { ifName = getOccName tycon,
1087 ifExtName = tyConExtName tycon }
1089 | otherwise = pprPanic "toIfaceDecl" (ppr tycon)
1091 tyvars = tyConTyVars tycon
1092 (syn_isOpen, syn_tyki) = case synTyConRhs tycon of
1093 OpenSynTyCon ki -> (True , ki)
1094 SynonymTyCon ty -> (False, ty)
1096 ifaceConDecls (NewTyCon { data_con = con }) =
1097 IfNewTyCon (ifaceConDecl con)
1098 ifaceConDecls (DataTyCon { data_cons = cons }) =
1099 IfDataTyCon (map ifaceConDecl cons)
1100 ifaceConDecls OpenDataTyCon = IfOpenDataTyCon
1101 ifaceConDecls OpenNewTyCon = IfOpenNewTyCon
1102 ifaceConDecls AbstractTyCon = IfAbstractTyCon
1103 -- The last case happens when a TyCon has been trimmed during tidying
1104 -- Furthermore, tyThingToIfaceDecl is also used
1105 -- in TcRnDriver for GHCi, when browsing a module, in which case the
1106 -- AbstractTyCon case is perfectly sensible.
1108 ifaceConDecl data_con
1109 = IfCon { ifConOcc = getOccName (dataConName data_con),
1110 ifConInfix = dataConIsInfix data_con,
1111 ifConUnivTvs = toIfaceTvBndrs (dataConUnivTyVars data_con),
1112 ifConExTvs = toIfaceTvBndrs (dataConExTyVars data_con),
1113 ifConEqSpec = to_eq_spec (dataConEqSpec data_con),
1114 ifConCtxt = toIfaceContext (dataConTheta data_con),
1115 ifConArgTys = map toIfaceType (dataConOrigArgTys data_con),
1116 ifConFields = map getOccName
1117 (dataConFieldLabels data_con),
1118 ifConStricts = dataConStrictMarks data_con }
1120 to_eq_spec spec = [(getOccName tv, toIfaceType ty) | (tv,ty) <- spec]
1122 famInstToIface Nothing = Nothing
1123 famInstToIface (Just (famTyCon, instTys)) =
1124 Just (toIfaceTyCon famTyCon, map toIfaceType instTys)
1126 tyThingToIfaceDecl (ADataCon dc)
1127 = pprPanic "toIfaceDecl" (ppr dc) -- Should be trimmed out earlier
1130 getFS x = occNameFS (getOccName x)
1132 --------------------------
1133 instanceToIfaceInst :: Instance -> IfaceInst
1134 instanceToIfaceInst ispec@(Instance { is_dfun = dfun_id, is_flag = oflag,
1135 is_cls = cls, is_tcs = mb_tcs,
1137 = IfaceInst { ifDFun = getName dfun_id,
1140 ifInstTys = map do_rough mb_tcs,
1143 do_rough Nothing = Nothing
1144 do_rough (Just n) = Just (toIfaceTyCon_name n)
1146 --------------------------
1147 famInstToIfaceFamInst :: FamInst -> IfaceFamInst
1148 famInstToIfaceFamInst fi@(FamInst { fi_tycon = tycon,
1149 fi_fam = fam, fi_tcs = mb_tcs })
1150 = IfaceFamInst { ifFamInstTyCon = toIfaceTyCon tycon
1151 , ifFamInstFam = fam
1152 , ifFamInstTys = map do_rough mb_tcs }
1154 do_rough Nothing = Nothing
1155 do_rough (Just n) = Just (toIfaceTyCon_name n)
1157 --------------------------
1158 toIfaceIdInfo :: IdInfo -> [IfaceInfoItem]
1159 toIfaceIdInfo id_info
1160 = catMaybes [arity_hsinfo, caf_hsinfo, strict_hsinfo,
1161 inline_hsinfo, wrkr_hsinfo, unfold_hsinfo]
1163 ------------ Arity --------------
1164 arity_info = arityInfo id_info
1165 arity_hsinfo | arity_info == 0 = Nothing
1166 | otherwise = Just (HsArity arity_info)
1168 ------------ Caf Info --------------
1169 caf_info = cafInfo id_info
1170 caf_hsinfo = case caf_info of
1171 NoCafRefs -> Just HsNoCafRefs
1174 ------------ Strictness --------------
1175 -- No point in explicitly exporting TopSig
1176 strict_hsinfo = case newStrictnessInfo id_info of
1177 Just sig | not (isTopSig sig) -> Just (HsStrictness sig)
1180 ------------ Worker --------------
1181 work_info = workerInfo id_info
1182 has_worker = case work_info of { HasWorker _ _ -> True; other -> False }
1183 wrkr_hsinfo = case work_info of
1184 HasWorker work_id wrap_arity ->
1185 Just (HsWorker ((idName work_id)) wrap_arity)
1188 ------------ Unfolding --------------
1189 -- The unfolding is redundant if there is a worker
1190 unfold_info = unfoldingInfo id_info
1191 rhs = unfoldingTemplate unfold_info
1192 no_unfolding = neverUnfold unfold_info
1193 -- The CoreTidy phase retains unfolding info iff
1194 -- we want to expose the unfolding, taking into account
1195 -- unconditional NOINLINE, etc. See TidyPgm.addExternal
1196 unfold_hsinfo | no_unfolding = Nothing
1197 | has_worker = Nothing -- Unfolding is implicit
1198 | otherwise = Just (HsUnfold (toIfaceExpr rhs))
1200 ------------ Inline prag --------------
1201 inline_prag = inlinePragInfo id_info
1202 inline_hsinfo | isAlwaysActive inline_prag = Nothing
1203 | no_unfolding && not has_worker = Nothing
1204 -- If the iface file give no unfolding info, we
1205 -- don't need to say when inlining is OK!
1206 | otherwise = Just (HsInline inline_prag)
1208 --------------------------
1209 coreRuleToIfaceRule :: CoreRule -> IfaceRule
1210 coreRuleToIfaceRule (BuiltinRule { ru_fn = fn})
1211 = pprTrace "toHsRule: builtin" (ppr fn) $
1214 coreRuleToIfaceRule (Rule { ru_name = name, ru_fn = fn,
1215 ru_act = act, ru_bndrs = bndrs,
1216 ru_args = args, ru_rhs = rhs, ru_orph = orph })
1217 = IfaceRule { ifRuleName = name, ifActivation = act,
1218 ifRuleBndrs = map toIfaceBndr bndrs,
1220 ifRuleArgs = map do_arg args,
1221 ifRuleRhs = toIfaceExpr rhs,
1224 -- For type args we must remove synonyms from the outermost
1225 -- level. Reason: so that when we read it back in we'll
1226 -- construct the same ru_rough field as we have right now;
1228 do_arg (Type ty) = IfaceType (toIfaceType (deNoteType ty))
1229 do_arg arg = toIfaceExpr arg
1231 bogusIfaceRule :: Name -> IfaceRule
1232 bogusIfaceRule id_name
1233 = IfaceRule { ifRuleName = FSLIT("bogus"), ifActivation = NeverActive,
1234 ifRuleBndrs = [], ifRuleHead = id_name, ifRuleArgs = [],
1235 ifRuleRhs = IfaceExt id_name, ifRuleOrph = Nothing }
1237 ---------------------
1238 toIfaceExpr :: CoreExpr -> IfaceExpr
1239 toIfaceExpr (Var v) = toIfaceVar v
1240 toIfaceExpr (Lit l) = IfaceLit l
1241 toIfaceExpr (Type ty) = IfaceType (toIfaceType ty)
1242 toIfaceExpr (Lam x b) = IfaceLam (toIfaceBndr x) (toIfaceExpr b)
1243 toIfaceExpr (App f a) = toIfaceApp f [a]
1244 toIfaceExpr (Case s x ty as) = IfaceCase (toIfaceExpr s) (getFS x) (toIfaceType ty) (map toIfaceAlt as)
1245 toIfaceExpr (Let b e) = IfaceLet (toIfaceBind b) (toIfaceExpr e)
1246 toIfaceExpr (Cast e co) = IfaceCast (toIfaceExpr e) (toIfaceType co)
1247 toIfaceExpr (Note n e) = IfaceNote (toIfaceNote n) (toIfaceExpr e)
1249 ---------------------
1250 toIfaceNote (SCC cc) = IfaceSCC cc
1251 toIfaceNote InlineMe = IfaceInlineMe
1252 toIfaceNote (CoreNote s) = IfaceCoreNote s
1254 ---------------------
1255 toIfaceBind (NonRec b r) = IfaceNonRec (toIfaceIdBndr b) (toIfaceExpr r)
1256 toIfaceBind (Rec prs) = IfaceRec [(toIfaceIdBndr b, toIfaceExpr r) | (b,r) <- prs]
1258 ---------------------
1259 toIfaceAlt (c,bs,r) = (toIfaceCon c, map getFS bs, toIfaceExpr r)
1261 ---------------------
1262 toIfaceCon (DataAlt dc) | isTupleTyCon tc = IfaceTupleAlt (tupleTyConBoxity tc)
1263 | otherwise = IfaceDataAlt (getName dc)
1265 tc = dataConTyCon dc
1267 toIfaceCon (LitAlt l) = IfaceLitAlt l
1268 toIfaceCon DEFAULT = IfaceDefault
1270 ---------------------
1271 toIfaceApp (App f a) as = toIfaceApp f (a:as)
1272 toIfaceApp (Var v) as
1273 = case isDataConWorkId_maybe v of
1274 -- We convert the *worker* for tuples into IfaceTuples
1275 Just dc | isTupleTyCon tc && saturated
1276 -> IfaceTuple (tupleTyConBoxity tc) tup_args
1278 val_args = dropWhile isTypeArg as
1279 saturated = val_args `lengthIs` idArity v
1280 tup_args = map toIfaceExpr val_args
1281 tc = dataConTyCon dc
1283 other -> mkIfaceApps (toIfaceVar v) as
1285 toIfaceApp e as = mkIfaceApps (toIfaceExpr e) as
1287 mkIfaceApps f as = foldl (\f a -> IfaceApp f (toIfaceExpr a)) f as
1289 ---------------------
1290 toIfaceVar :: Id -> IfaceExpr
1292 | Just fcall <- isFCallId_maybe v = IfaceFCall fcall (toIfaceType (idType v))
1293 -- Foreign calls have special syntax
1294 | isExternalName name = IfaceExt name
1295 | otherwise = IfaceLcl (getFS name)