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,
249 md_vect_info = vect_info,
251 md_exports = exports })
253 -- NB: notice that mkIface does not look at the bindings
254 -- only at the TypeEnv. The previous Tidy phase has
255 -- put exactly the info into the TypeEnv that we want
256 -- to expose in the interface
258 = do { eps <- hscEPS hsc_env
259 ; let { entities = typeEnvElts type_env ;
260 decls = [ tyThingToIfaceDecl entity
261 | entity <- entities,
262 let name = getName entity,
263 not (isImplicitTyThing entity),
264 -- No implicit Ids and class tycons in the interface file
265 not (isWiredInName name),
266 -- Nor wired-in things; the compiler knows about them anyhow
267 nameIsLocalOrFrom this_mod name ]
268 -- Sigh: see Note [Root-main Id] in TcRnDriver
270 ; fixities = [(occ,fix) | FixItem occ fix _ <- nameEnvElts fix_env]
271 ; deprecs = mkIfaceDeprec src_deprecs
272 ; iface_rules = map (coreRuleToIfaceRule this_mod) rules
273 ; iface_insts = map instanceToIfaceInst insts
274 ; iface_fam_insts = map famInstToIfaceFamInst fam_insts
275 ; iface_vect_info = flattenVectInfo vect_info
277 ; intermediate_iface = ModIface {
278 mi_module = this_mod,
282 mi_exports = mkIfaceExports exports,
284 -- Sort these lexicographically, so that
285 -- the result is stable across compilations
286 mi_insts = sortLe le_inst iface_insts,
287 mi_fam_insts= sortLe le_fam_inst iface_fam_insts,
288 mi_rules = sortLe le_rule iface_rules,
290 mi_vect_info = iface_vect_info,
292 mi_fixities = fixities,
293 mi_deprecs = deprecs,
294 mi_globals = Just rdr_env,
296 -- Left out deliberately: filled in by addVersionInfo
297 mi_mod_vers = initialVersion,
298 mi_exp_vers = initialVersion,
299 mi_rule_vers = initialVersion,
300 mi_orphan = False, -- Always set by addVersionInfo, but
301 -- it's a strict field, so we can't omit it.
302 mi_finsts = False, -- Ditto
303 mi_decls = deliberatelyOmitted "decls",
304 mi_ver_fn = deliberatelyOmitted "ver_fn",
306 -- And build the cached values
307 mi_dep_fn = mkIfaceDepCache deprecs,
308 mi_fix_fn = mkIfaceFixCache fixities }
310 -- Add version information
311 ; ext_ver_fn = mkParentVerFun hsc_env eps
312 ; (new_iface, no_change_at_all, pp_diffs, pp_orphs)
313 = _scc_ "versioninfo"
314 addVersionInfo ext_ver_fn maybe_old_iface
315 intermediate_iface decls
319 ; when (isJust pp_orphs && dopt Opt_WarnOrphans dflags)
320 (printDump (expectJust "mkIface" pp_orphs))
321 ; when (dopt Opt_D_dump_hi_diffs dflags) (printDump pp_diffs)
322 ; dumpIfSet_dyn dflags Opt_D_dump_hi "FINAL INTERFACE"
323 (pprModIface new_iface)
325 ; return (new_iface, no_change_at_all) }
327 r1 `le_rule` r2 = ifRuleName r1 <= ifRuleName r2
328 i1 `le_inst` i2 = ifDFun i1 `le_occ` ifDFun i2
329 i1 `le_fam_inst` i2 = ifFamInstTcName i1 `le_occ` ifFamInstTcName i2
331 le_occ :: Name -> Name -> Bool
332 -- Compare lexicographically by OccName, *not* by unique, because
333 -- the latter is not stable across compilations
334 le_occ n1 n2 = nameOccName n1 <= nameOccName n2
336 dflags = hsc_dflags hsc_env
337 deliberatelyOmitted x = panic ("Deliberately omitted: " ++ x)
338 ifFamInstTcName = ifaceTyConName . ifFamInstTyCon
340 flattenVectInfo (VectInfo ccVar) = IfaceVectInfo (nameSetToList ccVar)
342 -----------------------------
343 writeIfaceFile :: DynFlags -> ModLocation -> ModIface -> IO ()
344 writeIfaceFile dflags location new_iface
345 = do createDirectoryHierarchy (directoryOf hi_file_path)
346 writeBinIface dflags hi_file_path new_iface
347 where hi_file_path = ml_hi_file location
350 -- -----------------------------------------------------------------------------
351 -- Look up parents and versions of Names
353 -- This is like a global version of the mi_ver_fn field in each ModIface.
354 -- Given a Name, it finds the ModIface, and then uses mi_ver_fn to get
355 -- the parent and version info.
358 :: HscEnv -- needed to look up versions
359 -> ExternalPackageState -- ditto
360 -> (Name -> (OccName,Version))
361 mkParentVerFun hsc_env eps
364 mod = nameModule name
365 occ = nameOccName name
366 iface = lookupIfaceByModule (hsc_dflags hsc_env) hpt pit mod `orElse`
367 pprPanic "lookupVers2" (ppr mod <+> ppr occ)
369 mi_ver_fn iface occ `orElse`
370 pprPanic "lookupVers1" (ppr mod <+> ppr occ)
372 hpt = hsc_HPT hsc_env
375 -----------------------------------------------------------------------------
376 -- Compute version numbers for local decls
379 :: (Name -> (OccName,Version)) -- lookup parents and versions of names
380 -> Maybe ModIface -- The old interface, read from M.hi
381 -> ModIface -- The new interface (lacking decls)
382 -> [IfaceDecl] -- The new decls
383 -> (ModIface, -- Updated interface
384 Bool, -- True <=> no changes at all; no need to write Iface
386 Maybe SDoc) -- Warnings about orphans
388 addVersionInfo ver_fn Nothing new_iface new_decls
389 -- No old interface, so definitely write a new one!
390 = (new_iface { mi_orphan = not (null orph_insts && null orph_rules)
391 , mi_finsts = not . null $ mi_fam_insts new_iface
392 , mi_decls = [(initialVersion, decl) | decl <- new_decls]
393 , mi_ver_fn = mkIfaceVerCache (zip (repeat initialVersion)
397 ptext SLIT("No old interface file"),
398 pprOrphans orph_insts orph_rules)
400 orph_insts = filter (isNothing . ifInstOrph) (mi_insts new_iface)
401 orph_rules = filter (isNothing . ifRuleOrph) (mi_rules new_iface)
403 addVersionInfo ver_fn (Just old_iface@(ModIface {
404 mi_mod_vers = old_mod_vers,
405 mi_exp_vers = old_exp_vers,
406 mi_rule_vers = old_rule_vers,
407 mi_decls = old_decls,
408 mi_ver_fn = old_decl_vers,
409 mi_fix_fn = old_fixities }))
410 new_iface@(ModIface { mi_fix_fn = new_fixities })
413 = (old_iface, True, ptext SLIT("Interface file unchanged"), pp_orphs)
415 = (final_iface, False, vcat [ptext SLIT("Interface file has changed"),
416 nest 2 pp_diffs], pp_orphs)
418 final_iface = new_iface {
419 mi_mod_vers = bump_unless no_output_change old_mod_vers,
420 mi_exp_vers = bump_unless no_export_change old_exp_vers,
421 mi_rule_vers = bump_unless no_rule_change old_rule_vers,
422 mi_orphan = not (null new_orph_rules && null new_orph_insts),
423 mi_finsts = not . null $ mi_fam_insts new_iface,
424 mi_decls = decls_w_vers,
425 mi_ver_fn = mkIfaceVerCache decls_w_vers }
427 decls_w_vers = [(add_vers decl, decl) | decl <- new_decls]
430 (old_non_orph_insts, old_orph_insts) =
431 mkOrphMap ifInstOrph (mi_insts old_iface)
432 (new_non_orph_insts, new_orph_insts) =
433 mkOrphMap ifInstOrph (mi_insts new_iface)
434 old_fam_insts = mi_fam_insts old_iface
435 new_fam_insts = mi_fam_insts new_iface
436 same_insts occ = eqMaybeBy (eqListBy eqIfInst)
437 (lookupOccEnv old_non_orph_insts occ)
438 (lookupOccEnv new_non_orph_insts occ)
440 (old_non_orph_rules, old_orph_rules) =
441 mkOrphMap ifRuleOrph (mi_rules old_iface)
442 (new_non_orph_rules, new_orph_rules) =
443 mkOrphMap ifRuleOrph (mi_rules new_iface)
444 same_rules occ = eqMaybeBy (eqListBy eqIfRule)
445 (lookupOccEnv old_non_orph_rules occ)
446 (lookupOccEnv new_non_orph_rules occ)
448 -- Computing what changed
449 no_output_change = no_decl_change && no_rule_change &&
450 no_export_change && no_deprec_change
451 no_export_change = mi_exports new_iface == mi_exports old_iface
453 no_decl_change = isEmptyOccSet changed_occs
454 no_rule_change = not (changedWrtNames changed_occs (eqListBy eqIfRule old_orph_rules new_orph_rules)
455 || changedWrtNames changed_occs (eqListBy eqIfInst old_orph_insts new_orph_insts)
456 || changedWrtNames changed_occs (eqListBy eqIfFamInst old_fam_insts new_fam_insts))
457 no_deprec_change = mi_deprecs new_iface == mi_deprecs old_iface
459 -- If the usages havn't changed either, we don't need to write the interface file
460 no_other_changes = mi_usages new_iface == mi_usages old_iface &&
461 mi_deps new_iface == mi_deps old_iface
462 no_change_at_all = no_output_change && no_other_changes
464 pp_diffs = vcat [pp_change no_export_change "Export list"
465 (ppr old_exp_vers <+> arrow <+> ppr (mi_exp_vers final_iface)),
466 pp_change no_rule_change "Rules"
467 (ppr old_rule_vers <+> arrow <+> ppr (mi_rule_vers final_iface)),
468 pp_change no_deprec_change "Deprecations" empty,
469 pp_change no_other_changes "Usages" empty,
471 pp_change True what info = empty
472 pp_change False what info = text what <+> ptext SLIT("changed") <+> info
475 old_decl_env = mkOccEnv [(ifName decl, decl) | (_,decl) <- old_decls]
476 same_fixity n = bool (old_fixities n == new_fixities n)
479 -- Adding version info
480 new_version = bumpVersion old_mod_vers
481 -- Start from the old module version, not from
482 -- zero so that if you remove f, and then add
483 -- it again, you don't thereby reduce f's
486 add_vers decl | occ `elemOccSet` changed_occs = new_version
487 | otherwise = snd (expectJust "add_vers" (old_decl_vers occ))
488 -- If it's unchanged, there jolly well
489 where -- should be an old version number
493 -- Deciding which declarations have changed
495 -- For each local decl, the IfaceEq gives the list of things that
496 -- must be unchanged for the declaration as a whole to be unchanged.
497 eq_info :: [(OccName, IfaceEq)]
498 eq_info = map check_eq new_decls
500 | Just old_decl <- lookupOccEnv old_decl_env occ
501 = (occ, new_decl `eqIfDecl` old_decl &&& eq_indirects new_decl)
502 | otherwise {- No corresponding old decl -}
505 occ = ifName new_decl
507 eq_indirects :: IfaceDecl -> IfaceEq
508 -- When seeing if two decls are the same, remember to
509 -- check whether any relevant fixity or rules have changed
510 eq_indirects (IfaceId {ifName = occ}) = eq_ind_occ occ
511 eq_indirects (IfaceClass {ifName = cls_occ, ifSigs = sigs})
512 = same_insts cls_occ &&&
513 eq_ind_occs [op | IfaceClassOp op _ _ <- sigs]
514 eq_indirects (IfaceData {ifName = tc_occ, ifCons = cons})
515 = same_insts tc_occ &&& same_fixity tc_occ &&& -- The TyCon can have a fixity too
516 eq_ind_occs (map ifConOcc (visibleIfConDecls cons))
517 eq_indirects other = Equal -- Synonyms and foreign declarations
519 eq_ind_occ :: OccName -> IfaceEq -- For class ops and Ids; check fixity and rules
520 eq_ind_occ occ = same_fixity occ &&& same_rules occ
521 eq_ind_occs = foldr ((&&&) . eq_ind_occ) Equal
523 -- The Occs of declarations that changed.
524 changed_occs :: OccSet
525 changed_occs = computeChangedOccs ver_fn (mi_module new_iface)
526 (mi_usages old_iface) eq_info
530 pp_decl_diffs :: SDoc -- Nothing => no changes
532 | isEmptyOccSet changed_occs = empty
534 = vcat [ptext SLIT("Changed occs:") <+> ppr (occSetElts changed_occs),
535 ptext SLIT("Version change for these decls:"),
536 nest 2 (vcat (map show_change new_decls))]
538 eq_env = mkOccEnv eq_info
540 | not (occ `elemOccSet` changed_occs) = empty
542 = vcat [ppr occ <+> ppr (old_decl_vers occ) <+> arrow <+> ppr new_version,
545 occ = ifName new_decl
546 why = case lookupOccEnv eq_env occ of
547 Just (EqBut names) -> sep [ppr occ <> colon, ptext SLIT("Free vars (only) changed:") <> ppr names,
548 nest 2 (braces (fsep (map ppr (occSetElts
549 (occs `intersectOccSet` changed_occs)))))]
550 where occs = mkOccSet (map nameOccName (nameSetToList names))
552 | Just old_decl <- lookupOccEnv old_decl_env occ
553 -> vcat [ptext SLIT("Old:") <+> ppr old_decl,
554 ptext SLIT("New:") <+> ppr new_decl]
556 -> ppr occ <+> ptext SLIT("only in new interface")
557 other -> pprPanic "MkIface.show_change" (ppr occ)
559 pp_orphs = pprOrphans new_orph_insts new_orph_rules
562 pprOrphans insts rules
563 | null insts && null rules = Nothing
566 if null insts then empty else
567 hang (ptext SLIT("Warning: orphan instances:"))
568 2 (vcat (map ppr insts)),
569 if null rules then empty else
570 hang (ptext SLIT("Warning: orphan rules:"))
571 2 (vcat (map ppr rules))
575 :: (Name -> (OccName,Version)) -- get parents and versions
576 -> Module -- This module
577 -> [Usage] -- Usages from old iface
578 -> [(OccName, IfaceEq)] -- decl names, equality conditions
579 -> OccSet -- set of things that have changed
580 computeChangedOccs ver_fn this_module old_usages eq_info
581 = foldl add_changes emptyOccSet (stronglyConnComp edges)
584 -- return True if an external name has changed
585 name_changed :: Name -> Bool
587 | Just ents <- lookupUFM usg_modmap (moduleName mod)
588 = case lookupUFM ents parent_occ of
589 Nothing -> pprPanic "computeChangedOccs" (ppr nm)
590 Just v -> v < new_version
591 | otherwise = False -- must be in another package
594 (parent_occ, new_version) = ver_fn nm
596 -- Turn the usages from the old ModIface into a mapping
597 usg_modmap = listToUFM [ (usg_mod usg, listToUFM (usg_entities usg))
598 | usg <- old_usages ]
600 get_local_eq_info :: GenIfaceEq NameSet -> GenIfaceEq OccSet
601 get_local_eq_info Equal = Equal
602 get_local_eq_info NotEqual = NotEqual
603 get_local_eq_info (EqBut ns) = foldNameSet f Equal ns
604 where f name eq | nameModule name == this_module =
605 EqBut (unitOccSet (nameOccName name)) `and_occifeq` eq
606 | name_changed name = NotEqual
609 local_eq_infos = mapSnd get_local_eq_info eq_info
611 edges :: [((OccName, OccIfaceEq), Unique, [Unique])]
612 edges = [ (node, getUnique occ, map getUnique occs)
613 | node@(occ, iface_eq) <- local_eq_infos
614 , let occs = case iface_eq of
615 EqBut occ_set -> occSetElts occ_set
618 -- Changes in declarations
619 add_changes :: OccSet -> SCC (OccName, OccIfaceEq) -> OccSet
620 add_changes so_far (AcyclicSCC (occ, iface_eq))
621 | changedWrt so_far iface_eq -- This one has changed
622 = extendOccSet so_far occ
623 add_changes so_far (CyclicSCC pairs)
624 | changedWrt so_far (foldr1 and_occifeq iface_eqs)
625 -- One of this group has changed
626 = extendOccSetList so_far occs
627 where (occs, iface_eqs) = unzip pairs
628 add_changes so_far other = so_far
630 type OccIfaceEq = GenIfaceEq OccSet
632 changedWrt :: OccSet -> OccIfaceEq -> Bool
633 changedWrt so_far Equal = False
634 changedWrt so_far NotEqual = True
635 changedWrt so_far (EqBut kids) = so_far `intersectsOccSet` kids
637 changedWrtNames :: OccSet -> IfaceEq -> Bool
638 changedWrtNames so_far Equal = False
639 changedWrtNames so_far NotEqual = True
640 changedWrtNames so_far (EqBut kids) =
641 so_far `intersectsOccSet` mkOccSet (map nameOccName (nameSetToList kids))
643 and_occifeq :: OccIfaceEq -> OccIfaceEq -> OccIfaceEq
644 Equal `and_occifeq` x = x
645 NotEqual `and_occifeq` x = NotEqual
646 EqBut nms `and_occifeq` Equal = EqBut nms
647 EqBut nms `and_occifeq` NotEqual = NotEqual
648 EqBut nms1 `and_occifeq` EqBut nms2 = EqBut (nms1 `unionOccSets` nms2)
650 ----------------------
651 -- mkOrphMap partitions instance decls or rules into
652 -- (a) an OccEnv for ones that are not orphans,
653 -- mapping the local OccName to a list of its decls
654 -- (b) a list of orphan decls
655 mkOrphMap :: (decl -> Maybe OccName) -- (Just occ) for a non-orphan decl, keyed by occ
656 -- Nothing for an orphan decl
657 -> [decl] -- Sorted into canonical order
658 -> (OccEnv [decl], -- Non-orphan decls associated with their key;
659 -- each sublist in canonical order
660 [decl]) -- Orphan decls; in canonical order
661 mkOrphMap get_key decls
662 = foldl go (emptyOccEnv, []) decls
664 go (non_orphs, orphs) d
665 | Just occ <- get_key d
666 = (extendOccEnv_C (\ ds _ -> d:ds) non_orphs occ [d], orphs)
667 | otherwise = (non_orphs, d:orphs)
669 ----------------------
670 mkIfaceDeprec :: Deprecations -> IfaceDeprecs
671 mkIfaceDeprec NoDeprecs = NoDeprecs
672 mkIfaceDeprec (DeprecAll t) = DeprecAll t
673 mkIfaceDeprec (DeprecSome env) = DeprecSome (sortLe (<=) (nameEnvElts env))
675 ----------------------
676 bump_unless :: Bool -> Version -> Version
677 bump_unless True v = v -- True <=> no change
678 bump_unless False v = bumpVersion v
682 %*********************************************************
684 \subsection{Keeping track of what we've slurped, and version numbers}
686 %*********************************************************
690 mkUsageInfo :: HscEnv
691 -> ModuleEnv (Module, Bool, SrcSpan)
692 -> [(ModuleName, IsBootInterface)]
693 -> NameSet -> IO [Usage]
694 mkUsageInfo hsc_env dir_imp_mods dep_mods used_names
695 = do { eps <- hscEPS hsc_env
696 ; let usages = mk_usage_info (eps_PIT eps) hsc_env
697 dir_imp_mods dep_mods used_names
698 ; usages `seqList` return usages }
699 -- seq the list of Usages returned: occasionally these
700 -- don't get evaluated for a while and we can end up hanging on to
701 -- the entire collection of Ifaces.
703 mk_usage_info pit hsc_env dir_imp_mods dep_mods used_names
704 = mapCatMaybes mkUsage dep_mods
705 -- ToDo: do we need to sort into canonical order?
707 hpt = hsc_HPT hsc_env
708 dflags = hsc_dflags hsc_env
710 -- ent_map groups together all the things imported and used
711 -- from a particular module in this package
712 ent_map :: ModuleEnv [OccName]
713 ent_map = foldNameSet add_mv emptyModuleEnv used_names
715 | isWiredInName name = mv_map -- ignore wired-in names
717 = case nameModule_maybe name of
718 Nothing -> mv_map -- ignore internal names
719 Just mod -> extendModuleEnv_C add_item mv_map mod [occ]
721 occ = nameOccName name
722 add_item occs _ = occ:occs
724 depend_on_exports mod = case lookupModuleEnv dir_imp_mods mod of
725 Just (_,no_imp,_) -> not no_imp
728 -- We want to create a Usage for a home module if
729 -- a) we used something from; has something in used_names
730 -- b) we imported all of it, even if we used nothing from it
731 -- (need to recompile if its export list changes: export_vers)
732 -- c) is a home-package orphan or family-instance module (need to
733 -- recompile if its instance decls change: rules_vers)
734 mkUsage :: (ModuleName, IsBootInterface) -> Maybe Usage
735 mkUsage (mod_name, _)
736 | isNothing maybe_iface -- We can't depend on it if we didn't
737 || (null used_occs -- load its interface.
738 && isNothing export_vers
741 = Nothing -- Record no usage info
744 = Just (Usage { usg_name = mod_name,
746 usg_exports = export_vers,
747 usg_entities = fmToList ent_vers,
748 usg_rules = rules_vers })
750 maybe_iface = lookupIfaceByModule dflags hpt pit mod
751 -- In one-shot mode, the interfaces for home-package
752 -- modules accumulate in the PIT not HPT. Sigh.
754 mod = mkModule (thisPackage dflags) mod_name
756 Just iface = maybe_iface
757 orphan_mod = mi_orphan iface
758 finsts_mod = mi_finsts iface
759 version_env = mi_ver_fn iface
760 mod_vers = mi_mod_vers iface
761 rules_vers = mi_rule_vers iface
762 export_vers | depend_on_exports mod = Just (mi_exp_vers iface)
763 | otherwise = Nothing
765 used_occs = lookupModuleEnv ent_map mod `orElse` []
767 -- Making a FiniteMap here ensures that (a) we remove duplicates
768 -- when we have usages on several subordinates of a single parent,
769 -- and (b) that the usages emerge in a canonical order, which
770 -- is why we use FiniteMap rather than OccEnv: FiniteMap works
771 -- using Ord on the OccNames, which is a lexicographic ordering.
772 ent_vers :: FiniteMap OccName Version
773 ent_vers = listToFM (map lookup_occ used_occs)
776 case version_env occ of
777 Nothing -> pprTrace "hmm, strange" (ppr mod <+> ppr occ) $
778 (occ, initialVersion) -- does this ever happen?
779 Just (parent, version) -> (parent, version)
783 mkIfaceExports :: [AvailInfo]
784 -> [(Module, [GenAvailInfo OccName])]
785 -- Group by module and sort by occurrence
786 -- This keeps the list in canonical order
787 mkIfaceExports exports
788 = [ (mod, eltsFM avails)
789 | (mod, avails) <- fmToList groupFM
792 -- Deliberately use FiniteMap rather than UniqFM so we
793 -- get a canonical ordering
794 groupFM :: ModuleEnv (FiniteMap FastString (GenAvailInfo OccName))
795 groupFM = foldl add emptyModuleEnv exports
798 = extendModuleEnv_C add_avail env mod (unitFM avail_fs avail_occ)
800 avail_occ = availToOccs avail
801 mod = nameModule (availName avail)
802 avail_fs = occNameFS (availName avail_occ)
803 add_avail avail_fm _ = addToFM avail_fm avail_fs avail_occ
805 availToOccs (Avail n) = Avail (nameOccName n)
806 availToOccs (AvailTC tc ns) = AvailTC (nameOccName tc) (map nameOccName ns)
810 %************************************************************************
812 Load the old interface file for this module (unless
813 we have it aleady), and check whether it is up to date
816 %************************************************************************
819 checkOldIface :: HscEnv
821 -> Bool -- Source unchanged
822 -> Maybe ModIface -- Old interface from compilation manager, if any
823 -> IO (RecompileRequired, Maybe ModIface)
825 checkOldIface hsc_env mod_summary source_unchanged maybe_iface
826 = do { showPass (hsc_dflags hsc_env)
827 ("Checking old interface for " ++
828 showSDoc (ppr (ms_mod mod_summary))) ;
830 ; initIfaceCheck hsc_env $
831 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
834 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
835 = do -- CHECK WHETHER THE SOURCE HAS CHANGED
836 { ifM (not source_unchanged)
837 (traceHiDiffs (nest 4 (text "Source file changed or recompilation check turned off")))
839 -- If the source has changed and we're in interactive mode, avoid reading
840 -- an interface; just return the one we might have been supplied with.
841 ; let dflags = hsc_dflags hsc_env
842 ; if not (isObjectTarget (hscTarget dflags)) && 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 OpenTyCon { otIsNewtype = False } = IfOpenDataTyCon
1101 ifaceConDecls OpenTyCon { otIsNewtype = True } = 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_name, is_tcs = mb_tcs })
1136 = ASSERT( cls_name == className cls )
1137 IfaceInst { ifDFun = dfun_name,
1139 ifInstCls = cls_name,
1140 ifInstTys = map do_rough mb_tcs,
1143 do_rough Nothing = Nothing
1144 do_rough (Just n) = Just (toIfaceTyCon_name n)
1146 dfun_name = idName dfun_id
1147 mod = nameModule dfun_name
1148 is_local name = nameIsLocalOrFrom mod name
1150 -- Compute orphanhood. See Note [Orphans] in IfaceSyn
1151 (_, _, cls, tys) = tcSplitDFunTy (idType dfun_id)
1152 -- Slightly awkward: we need the Class to get the fundeps
1153 (tvs, fds) = classTvsFds cls
1154 arg_names = [filterNameSet is_local (tyClsNamesOfType ty) | ty <- tys]
1155 orph | is_local cls_name = Just (nameOccName cls_name)
1156 | all isJust mb_ns = head mb_ns
1157 | otherwise = Nothing
1159 mb_ns :: [Maybe OccName] -- One for each fundep; a locally-defined name
1160 -- that is not in the "determined" arguments
1161 mb_ns | null fds = [choose_one arg_names]
1162 | otherwise = map do_one fds
1163 do_one (ltvs,rtvs) = choose_one [ns | (tv,ns) <- tvs `zip` arg_names
1164 , not (tv `elem` rtvs)]
1166 choose_one :: [NameSet] -> Maybe OccName
1167 choose_one nss = case nameSetToList (unionManyNameSets nss) of
1169 (n:ns) -> Just (nameOccName n)
1171 --------------------------
1172 famInstToIfaceFamInst :: FamInst -> IfaceFamInst
1173 famInstToIfaceFamInst fi@(FamInst { fi_tycon = tycon,
1174 fi_fam = fam, fi_tcs = mb_tcs })
1175 = IfaceFamInst { ifFamInstTyCon = toIfaceTyCon tycon
1176 , ifFamInstFam = fam
1177 , ifFamInstTys = map do_rough mb_tcs }
1179 do_rough Nothing = Nothing
1180 do_rough (Just n) = Just (toIfaceTyCon_name n)
1182 --------------------------
1183 toIfaceLetBndr id = IfLetBndr (occNameFS (getOccName id))
1184 (toIfaceType (idType id))
1187 -- Stripped-down version of tcIfaceIdInfo
1188 -- Change this if you want to export more IdInfo for
1189 -- non-top-level Ids. Don't forget to change
1190 -- CoreTidy.tidyLetBndr too!
1192 -- See Note [IdInfo on nested let-bindings] in IfaceSyn
1194 inline_prag = inlinePragInfo id_info
1195 prag_info | isAlwaysActive inline_prag = NoInfo
1196 | otherwise = HasInfo [HsInline inline_prag]
1198 --------------------------
1199 toIfaceIdInfo :: IdInfo -> [IfaceInfoItem]
1200 toIfaceIdInfo id_info
1201 = catMaybes [arity_hsinfo, caf_hsinfo, strict_hsinfo,
1202 inline_hsinfo, wrkr_hsinfo, unfold_hsinfo]
1204 ------------ Arity --------------
1205 arity_info = arityInfo id_info
1206 arity_hsinfo | arity_info == 0 = Nothing
1207 | otherwise = Just (HsArity arity_info)
1209 ------------ Caf Info --------------
1210 caf_info = cafInfo id_info
1211 caf_hsinfo = case caf_info of
1212 NoCafRefs -> Just HsNoCafRefs
1215 ------------ Strictness --------------
1216 -- No point in explicitly exporting TopSig
1217 strict_hsinfo = case newStrictnessInfo id_info of
1218 Just sig | not (isTopSig sig) -> Just (HsStrictness sig)
1221 ------------ Worker --------------
1222 work_info = workerInfo id_info
1223 has_worker = case work_info of { HasWorker _ _ -> True; other -> False }
1224 wrkr_hsinfo = case work_info of
1225 HasWorker work_id wrap_arity ->
1226 Just (HsWorker ((idName work_id)) wrap_arity)
1229 ------------ Unfolding --------------
1230 -- The unfolding is redundant if there is a worker
1231 unfold_info = unfoldingInfo id_info
1232 rhs = unfoldingTemplate unfold_info
1233 no_unfolding = neverUnfold unfold_info
1234 -- The CoreTidy phase retains unfolding info iff
1235 -- we want to expose the unfolding, taking into account
1236 -- unconditional NOINLINE, etc. See TidyPgm.addExternal
1237 unfold_hsinfo | no_unfolding = Nothing
1238 | has_worker = Nothing -- Unfolding is implicit
1239 | otherwise = Just (HsUnfold (toIfaceExpr rhs))
1241 ------------ Inline prag --------------
1242 inline_prag = inlinePragInfo id_info
1243 inline_hsinfo | isAlwaysActive inline_prag = Nothing
1244 | no_unfolding && not has_worker = Nothing
1245 -- If the iface file give no unfolding info, we
1246 -- don't need to say when inlining is OK!
1247 | otherwise = Just (HsInline inline_prag)
1249 --------------------------
1250 coreRuleToIfaceRule :: Module -> CoreRule -> IfaceRule
1251 coreRuleToIfaceRule mod (BuiltinRule { ru_fn = fn})
1252 = pprTrace "toHsRule: builtin" (ppr fn) $
1255 coreRuleToIfaceRule mod (Rule { ru_name = name, ru_fn = fn,
1256 ru_act = act, ru_bndrs = bndrs,
1257 ru_args = args, ru_rhs = rhs })
1258 = IfaceRule { ifRuleName = name, ifActivation = act,
1259 ifRuleBndrs = map toIfaceBndr bndrs,
1261 ifRuleArgs = map do_arg args,
1262 ifRuleRhs = toIfaceExpr rhs,
1265 -- For type args we must remove synonyms from the outermost
1266 -- level. Reason: so that when we read it back in we'll
1267 -- construct the same ru_rough field as we have right now;
1269 do_arg (Type ty) = IfaceType (toIfaceType (deNoteType ty))
1270 do_arg arg = toIfaceExpr arg
1272 -- Compute orphanhood. See Note [Orphans] in IfaceSyn
1273 -- A rule is an orphan only if none of the variables
1274 -- mentioned on its left-hand side are locally defined
1275 lhs_names = fn : nameSetToList (exprsFreeNames args)
1276 -- No need to delete bndrs, because
1277 -- exprsFreeNames finds only External names
1279 orph = case filter (nameIsLocalOrFrom mod) lhs_names of
1280 (n:ns) -> Just (nameOccName n)
1283 bogusIfaceRule :: Name -> IfaceRule
1284 bogusIfaceRule id_name
1285 = IfaceRule { ifRuleName = FSLIT("bogus"), ifActivation = NeverActive,
1286 ifRuleBndrs = [], ifRuleHead = id_name, ifRuleArgs = [],
1287 ifRuleRhs = IfaceExt id_name, ifRuleOrph = Nothing }
1289 ---------------------
1290 toIfaceExpr :: CoreExpr -> IfaceExpr
1291 toIfaceExpr (Var v) = toIfaceVar v
1292 toIfaceExpr (Lit l) = IfaceLit l
1293 toIfaceExpr (Type ty) = IfaceType (toIfaceType ty)
1294 toIfaceExpr (Lam x b) = IfaceLam (toIfaceBndr x) (toIfaceExpr b)
1295 toIfaceExpr (App f a) = toIfaceApp f [a]
1296 toIfaceExpr (Case s x ty as) = IfaceCase (toIfaceExpr s) (getFS x) (toIfaceType ty) (map toIfaceAlt as)
1297 toIfaceExpr (Let b e) = IfaceLet (toIfaceBind b) (toIfaceExpr e)
1298 toIfaceExpr (Cast e co) = IfaceCast (toIfaceExpr e) (toIfaceType co)
1299 toIfaceExpr (Note n e) = IfaceNote (toIfaceNote n) (toIfaceExpr e)
1301 ---------------------
1302 toIfaceNote (SCC cc) = IfaceSCC cc
1303 toIfaceNote InlineMe = IfaceInlineMe
1304 toIfaceNote (CoreNote s) = IfaceCoreNote s
1306 ---------------------
1307 toIfaceBind (NonRec b r) = IfaceNonRec (toIfaceLetBndr b) (toIfaceExpr r)
1308 toIfaceBind (Rec prs) = IfaceRec [(toIfaceLetBndr b, toIfaceExpr r) | (b,r) <- prs]
1310 ---------------------
1311 toIfaceAlt (c,bs,r) = (toIfaceCon c, map getFS bs, toIfaceExpr r)
1313 ---------------------
1314 toIfaceCon (DataAlt dc) | isTupleTyCon tc = IfaceTupleAlt (tupleTyConBoxity tc)
1315 | otherwise = IfaceDataAlt (getName dc)
1317 tc = dataConTyCon dc
1319 toIfaceCon (LitAlt l) = IfaceLitAlt l
1320 toIfaceCon DEFAULT = IfaceDefault
1322 ---------------------
1323 toIfaceApp (App f a) as = toIfaceApp f (a:as)
1324 toIfaceApp (Var v) as
1325 = case isDataConWorkId_maybe v of
1326 -- We convert the *worker* for tuples into IfaceTuples
1327 Just dc | isTupleTyCon tc && saturated
1328 -> IfaceTuple (tupleTyConBoxity tc) tup_args
1330 val_args = dropWhile isTypeArg as
1331 saturated = val_args `lengthIs` idArity v
1332 tup_args = map toIfaceExpr val_args
1333 tc = dataConTyCon dc
1335 other -> mkIfaceApps (toIfaceVar v) as
1337 toIfaceApp e as = mkIfaceApps (toIfaceExpr e) as
1339 mkIfaceApps f as = foldl (\f a -> IfaceApp f (toIfaceExpr a)) f as
1341 ---------------------
1342 toIfaceVar :: Id -> IfaceExpr
1344 | Just fcall <- isFCallId_maybe v = IfaceFCall fcall (toIfaceType (idType v))
1345 -- Foreign calls have special syntax
1346 | isExternalName name = IfaceExt name
1347 | otherwise = IfaceLcl (getFS name)