2 % (c) The University of Glasgow 2006
3 % (c) The GRASP/AQUA Project, Glasgow University, 1993-1998
8 mkUsageInfo, -- Construct the usage info for a module
10 mkIface, -- Build a ModIface from a ModGuts,
11 -- including computing version information
13 writeIfaceFile, -- Write the interface file
15 checkOldIface, -- See if recompilation is required, by
16 -- comparing version information
18 tyThingToIfaceDecl -- Converting things to their Iface equivalents
22 -----------------------------------------------
23 MkIface.lhs deals with versioning
24 -----------------------------------------------
26 Here's the version-related info in an interface file
28 module Foo 8 -- module-version
29 3 -- export-list-version
31 Usages: -- Version info for what this compilation of Foo imported
32 Baz 3 -- Module version
33 [4] -- The export-list version if Foo depended on it
34 (g,2) -- Function and its version
35 (T,1) -- Type and its version
37 <version> f :: Int -> Int {- Unfolding: \x -> Wib.t[2] x -}
38 -- The [2] says that f's unfolding
39 -- mentions verison 2 of Wib.t
41 -----------------------------------------------
43 -----------------------------------------------
46 * In the mi_usages information in an interface, we record the
47 version number of each free variable of the module
49 * In mkIface, we compute the version number of each exported thing A.f
50 by comparing its A.f's info with its new info, and bumping its
51 version number if it differs. If A.f mentions B.g, and B.g's version
52 number has changed, then we count A.f as having changed too.
54 * In checkOldIface we compare the mi_usages for the module with
55 the actual version info for all each thing recorded in mi_usages
60 We count A.f as changing if its fixity changes
64 If a rule changes, we want to recompile any module that might be
65 affected by that rule. For non-orphan rules, this is relatively easy.
66 If module M defines f, and a rule for f, just arrange that the version
67 number for M.f changes if any of the rules for M.f change. Any module
68 that does not depend on M.f can't be affected by the rule-change
71 Orphan rules (ones whose 'head function' is not defined in M) are
72 harder. Here's what we do.
74 * We have a per-module orphan-rule version number which changes if
75 any orphan rule changes. (It's unaffected by non-orphan rules.)
77 * We record usage info for any orphan module 'below' this one,
78 giving the orphan-rule version number. We recompile if this
81 The net effect is that if an orphan rule changes, we recompile every
82 module above it. That's very conservative, but it's devilishly hard
83 to know what it might affect, so we just have to be conservative.
87 In an iface file we have
89 instance Eq a => Eq [a] = dfun29
92 We have a version number for dfun29, covering its unfolding
93 etc. Suppose we are compiling a module M that imports A only
94 indirectly. If typechecking M uses this instance decl, we record the
95 dependency on A.dfun29 as if it were a free variable of the module
96 (via the tcg_inst_usages accumulator). That means that A will appear
97 in M's usage list. If the shape of the instance declaration changes,
98 then so will dfun29's version, triggering a recompilation.
100 Adding an instance declaration, or changing an instance decl that is
101 not currently used, is more tricky. (This really only makes a
102 difference when we have overlapping instance decls, because then the
103 new instance decl might kick in to override the old one.) We handle
104 this in a very similar way that we handle rules above.
106 * For non-orphan instance decls, identify one locally-defined tycon/class
107 mentioned in the decl. Treat the instance decl as part of the defn of that
108 tycon/class, so that if the shape of the instance decl changes, so does the
109 tycon/class; that in turn will force recompilation of anything that uses
112 * For orphan instance decls, act the same way as for orphan rules.
113 Indeed, we use the same global orphan-rule version number.
117 mkUsageInfo figures out what the ``usage information'' for this
118 moudule is; that is, what it must record in its interface file as the
121 We produce a line for every module B below the module, A, currently being
124 to record the fact that A does import B indirectly. This is used to decide
125 to look to look for B.hi rather than B.hi-boot when compiling a module that
126 imports A. This line says that A imports B, but uses nothing in it.
127 So we'll get an early bale-out when compiling A if B's version changes.
129 The usage information records:
132 \item (a) anything reachable from its body code
133 \item (b) any module exported with a @module Foo@
134 \item (c) anything reachable from an exported item
137 Why (b)? Because if @Foo@ changes then this module's export list
138 will change, so we must recompile this module at least as far as
139 making a new interface file --- but in practice that means complete
142 Why (c)? Consider this:
144 module A( f, g ) where | module B( f ) where
145 import B( f ) | f = h 3
149 Here, @B.f@ isn't used in A. Should we nevertheless record @B.f@ in
150 @A@'s usages? Our idea is that we aren't going to touch A.hi if it is
151 *identical* to what it was before. If anything about @B.f@ changes
152 than anyone who imports @A@ should be recompiled in case they use
153 @B.f@ (they'll get an early exit if they don't). So, if anything
154 about @B.f@ changes we'd better make sure that something in A.hi
155 changes, and the convenient way to do that is to record the version
156 number @B.f@ in A.hi in the usage list. If B.f changes that'll force a
157 complete recompiation of A, which is overkill but it's the only way to
158 write a new, slightly different, A.hi.
160 But the example is tricker. Even if @B.f@ doesn't change at all,
161 @B.h@ may do so, and this change may not be reflected in @f@'s version
162 number. But with -O, a module that imports A must be recompiled if
163 @B.h@ changes! So A must record a dependency on @B.h@. So we treat
164 the occurrence of @B.f@ in the export list *just as if* it were in the
165 code of A, and thereby haul in all the stuff reachable from it.
167 *** Conclusion: if A mentions B.f in its export list,
168 behave just as if A mentioned B.f in its source code,
169 and slurp in B.f and all its transitive closure ***
171 [NB: If B was compiled with -O, but A isn't, we should really *still*
172 haul in all the unfoldings for B, in case the module that imports A *is*
173 compiled with -O. I think this is the case.]
177 #include "HsVersions.h"
208 import PackageConfig hiding ( Version )
210 import BasicTypes hiding ( SuccessFlag(..) )
212 import Util hiding ( eqListBy )
223 %************************************************************************
225 \subsection{Completing an interface}
227 %************************************************************************
231 -> Maybe ModIface -- The old interface, if we have it
232 -> ModGuts -- Usages, deprecations, etc
233 -> ModDetails -- The trimmed, tidied interface
234 -> IO (ModIface, -- The new one, complete with decls and versions
235 Bool) -- True <=> there was an old Iface, and the new one
236 -- is identical, so no need to write it
238 mkIface hsc_env maybe_old_iface
239 (ModGuts{ mg_module = this_mod,
243 mg_rdr_env = rdr_env,
244 mg_fix_env = fix_env,
245 mg_deprecs = src_deprecs })
246 (ModDetails{ md_insts = insts,
247 md_fam_insts = fam_insts,
250 md_exports = exports })
252 -- NB: notice that mkIface does not look at the bindings
253 -- only at the TypeEnv. The previous Tidy phase has
254 -- put exactly the info into the TypeEnv that we want
255 -- to expose in the interface
257 = do { eps <- hscEPS hsc_env
258 ; let { entities = typeEnvElts type_env ;
259 decls = [ tyThingToIfaceDecl entity
260 | entity <- entities,
261 let name = getName entity,
262 not (isImplicitTyThing entity),
263 -- No implicit Ids and class tycons in the interface file
264 not (isWiredInName name),
265 -- Nor wired-in things; the compiler knows about them anyhow
266 nameIsLocalOrFrom this_mod name ]
267 -- Sigh: see Note [Root-main Id] in TcRnDriver
269 ; fixities = [(occ,fix) | FixItem occ fix _ <- nameEnvElts fix_env]
270 ; deprecs = mkIfaceDeprec src_deprecs
271 ; iface_rules = map (coreRuleToIfaceRule this_mod) rules
272 ; iface_insts = map instanceToIfaceInst insts
273 ; iface_fam_insts = map famInstToIfaceFamInst fam_insts
275 ; intermediate_iface = ModIface {
276 mi_module = this_mod,
280 mi_exports = mkIfaceExports exports,
282 -- Sort these lexicographically, so that
283 -- the result is stable across compilations
284 mi_insts = sortLe le_inst iface_insts,
285 mi_fam_insts= sortLe le_fam_inst iface_fam_insts,
286 mi_rules = sortLe le_rule iface_rules,
288 mi_fixities = fixities,
289 mi_deprecs = deprecs,
290 mi_globals = Just rdr_env,
292 -- Left out deliberately: filled in by addVersionInfo
293 mi_mod_vers = initialVersion,
294 mi_exp_vers = initialVersion,
295 mi_rule_vers = initialVersion,
296 mi_orphan = False, -- Always set by addVersionInfo, but
297 -- it's a strict field, so we can't omit it.
298 mi_finsts = False, -- Ditto
299 mi_decls = deliberatelyOmitted "decls",
300 mi_ver_fn = deliberatelyOmitted "ver_fn",
302 -- And build the cached values
303 mi_dep_fn = mkIfaceDepCache deprecs,
304 mi_fix_fn = mkIfaceFixCache fixities }
306 -- Add version information
307 ; ext_ver_fn = mkParentVerFun hsc_env eps
308 ; (new_iface, no_change_at_all, pp_diffs, pp_orphs)
309 = _scc_ "versioninfo"
310 addVersionInfo ext_ver_fn maybe_old_iface
311 intermediate_iface decls
315 ; when (isJust pp_orphs && dopt Opt_WarnOrphans dflags)
316 (printDump (expectJust "mkIface" pp_orphs))
317 ; when (dopt Opt_D_dump_hi_diffs dflags) (printDump pp_diffs)
318 ; dumpIfSet_dyn dflags Opt_D_dump_hi "FINAL INTERFACE"
319 (pprModIface new_iface)
321 ; return (new_iface, no_change_at_all) }
323 r1 `le_rule` r2 = ifRuleName r1 <= ifRuleName r2
324 i1 `le_inst` i2 = ifDFun i1 `le_occ` ifDFun i2
325 i1 `le_fam_inst` i2 = ifFamInstTcName i1 `le_occ` ifFamInstTcName i2
327 le_occ :: Name -> Name -> Bool
328 -- Compare lexicographically by OccName, *not* by unique, because
329 -- the latter is not stable across compilations
330 le_occ n1 n2 = nameOccName n1 <= nameOccName n2
332 dflags = hsc_dflags hsc_env
333 deliberatelyOmitted x = panic ("Deliberately omitted: " ++ x)
334 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 = not (null orph_insts && null orph_rules)
385 , mi_finsts = not . null $ mi_fam_insts new_iface
386 , mi_decls = [(initialVersion, decl) | decl <- new_decls]
387 , mi_ver_fn = mkIfaceVerCache (zip (repeat initialVersion)
391 ptext SLIT("No old interface file"),
392 pprOrphans orph_insts orph_rules)
394 orph_insts = filter (isNothing . ifInstOrph) (mi_insts new_iface)
395 orph_rules = filter (isNothing . ifRuleOrph) (mi_rules new_iface)
397 addVersionInfo ver_fn (Just old_iface@(ModIface {
398 mi_mod_vers = old_mod_vers,
399 mi_exp_vers = old_exp_vers,
400 mi_rule_vers = old_rule_vers,
401 mi_decls = old_decls,
402 mi_ver_fn = old_decl_vers,
403 mi_fix_fn = old_fixities }))
404 new_iface@(ModIface { mi_fix_fn = new_fixities })
407 = (old_iface, True, ptext SLIT("Interface file unchanged"), pp_orphs)
409 = (final_iface, False, vcat [ptext SLIT("Interface file has changed"),
410 nest 2 pp_diffs], pp_orphs)
412 final_iface = new_iface {
413 mi_mod_vers = bump_unless no_output_change old_mod_vers,
414 mi_exp_vers = bump_unless no_export_change old_exp_vers,
415 mi_rule_vers = bump_unless no_rule_change old_rule_vers,
416 mi_orphan = not (null new_orph_rules && null new_orph_insts),
417 mi_finsts = not . null $ mi_fam_insts new_iface,
418 mi_decls = decls_w_vers,
419 mi_ver_fn = mkIfaceVerCache decls_w_vers }
421 decls_w_vers = [(add_vers decl, decl) | decl <- new_decls]
424 (old_non_orph_insts, old_orph_insts) =
425 mkOrphMap ifInstOrph (mi_insts old_iface)
426 (new_non_orph_insts, new_orph_insts) =
427 mkOrphMap ifInstOrph (mi_insts new_iface)
428 old_fam_insts = mi_fam_insts old_iface
429 new_fam_insts = mi_fam_insts new_iface
430 same_insts occ = eqMaybeBy (eqListBy eqIfInst)
431 (lookupOccEnv old_non_orph_insts occ)
432 (lookupOccEnv new_non_orph_insts occ)
434 (old_non_orph_rules, old_orph_rules) =
435 mkOrphMap ifRuleOrph (mi_rules old_iface)
436 (new_non_orph_rules, new_orph_rules) =
437 mkOrphMap ifRuleOrph (mi_rules new_iface)
438 same_rules occ = eqMaybeBy (eqListBy eqIfRule)
439 (lookupOccEnv old_non_orph_rules occ)
440 (lookupOccEnv new_non_orph_rules occ)
442 -- Computing what changed
443 no_output_change = no_decl_change && no_rule_change &&
444 no_export_change && no_deprec_change
445 no_export_change = mi_exports new_iface == mi_exports old_iface
447 no_decl_change = isEmptyOccSet changed_occs
448 no_rule_change = not (changedWrtNames changed_occs (eqListBy eqIfRule old_orph_rules new_orph_rules)
449 || changedWrtNames changed_occs (eqListBy eqIfInst old_orph_insts new_orph_insts)
450 || changedWrtNames changed_occs (eqListBy eqIfFamInst old_fam_insts new_fam_insts))
451 no_deprec_change = mi_deprecs new_iface == mi_deprecs old_iface
453 -- If the usages havn't changed either, we don't need to write the interface file
454 no_other_changes = mi_usages new_iface == mi_usages old_iface &&
455 mi_deps new_iface == mi_deps old_iface
456 no_change_at_all = no_output_change && no_other_changes
458 pp_diffs = vcat [pp_change no_export_change "Export list"
459 (ppr old_exp_vers <+> arrow <+> ppr (mi_exp_vers final_iface)),
460 pp_change no_rule_change "Rules"
461 (ppr old_rule_vers <+> arrow <+> ppr (mi_rule_vers final_iface)),
462 pp_change no_deprec_change "Deprecations" empty,
463 pp_change no_other_changes "Usages" empty,
465 pp_change True what info = empty
466 pp_change False what info = text what <+> ptext SLIT("changed") <+> info
469 old_decl_env = mkOccEnv [(ifName decl, decl) | (_,decl) <- old_decls]
470 same_fixity n = bool (old_fixities n == new_fixities n)
473 -- Adding version info
474 new_version = bumpVersion old_mod_vers
475 -- Start from the old module version, not from
476 -- zero so that if you remove f, and then add
477 -- it again, you don't thereby reduce f's
480 add_vers decl | occ `elemOccSet` changed_occs = new_version
481 | otherwise = snd (expectJust "add_vers" (old_decl_vers occ))
482 -- If it's unchanged, there jolly well
483 where -- should be an old version number
487 -- Deciding which declarations have changed
489 -- For each local decl, the IfaceEq gives the list of things that
490 -- must be unchanged for the declaration as a whole to be unchanged.
491 eq_info :: [(OccName, IfaceEq)]
492 eq_info = map check_eq new_decls
494 | Just old_decl <- lookupOccEnv old_decl_env occ
495 = (occ, new_decl `eqIfDecl` old_decl &&& eq_indirects new_decl)
496 | otherwise {- No corresponding old decl -}
499 occ = ifName new_decl
501 eq_indirects :: IfaceDecl -> IfaceEq
502 -- When seeing if two decls are the same, remember to
503 -- check whether any relevant fixity or rules have changed
504 eq_indirects (IfaceId {ifName = occ}) = eq_ind_occ occ
505 eq_indirects (IfaceClass {ifName = cls_occ, ifSigs = sigs})
506 = same_insts cls_occ &&&
507 eq_ind_occs [op | IfaceClassOp op _ _ <- sigs]
508 eq_indirects (IfaceData {ifName = tc_occ, ifCons = cons})
509 = same_insts tc_occ &&& same_fixity tc_occ &&& -- The TyCon can have a fixity too
510 eq_ind_occs (map ifConOcc (visibleIfConDecls cons))
511 eq_indirects other = Equal -- Synonyms and foreign declarations
513 eq_ind_occ :: OccName -> IfaceEq -- For class ops and Ids; check fixity and rules
514 eq_ind_occ occ = same_fixity occ &&& same_rules occ
515 eq_ind_occs = foldr ((&&&) . eq_ind_occ) Equal
517 -- The Occs of declarations that changed.
518 changed_occs :: OccSet
519 changed_occs = computeChangedOccs ver_fn (mi_module new_iface)
520 (mi_usages old_iface) eq_info
524 pp_decl_diffs :: SDoc -- Nothing => no changes
526 | isEmptyOccSet changed_occs = empty
528 = vcat [ptext SLIT("Changed occs:") <+> ppr (occSetElts changed_occs),
529 ptext SLIT("Version change for these decls:"),
530 nest 2 (vcat (map show_change new_decls))]
532 eq_env = mkOccEnv eq_info
534 | not (occ `elemOccSet` changed_occs) = empty
536 = vcat [ppr occ <+> ppr (old_decl_vers occ) <+> arrow <+> ppr new_version,
539 occ = ifName new_decl
540 why = case lookupOccEnv eq_env occ of
541 Just (EqBut names) -> sep [ppr occ <> colon, ptext SLIT("Free vars (only) changed:") <> ppr names,
542 nest 2 (braces (fsep (map ppr (occSetElts
543 (occs `intersectOccSet` changed_occs)))))]
544 where occs = mkOccSet (map nameOccName (nameSetToList names))
546 | Just old_decl <- lookupOccEnv old_decl_env occ
547 -> vcat [ptext SLIT("Old:") <+> ppr old_decl,
548 ptext SLIT("New:") <+> ppr new_decl]
550 -> ppr occ <+> ptext SLIT("only in new interface")
551 other -> pprPanic "MkIface.show_change" (ppr occ)
553 pp_orphs = pprOrphans new_orph_insts new_orph_rules
556 pprOrphans insts rules
557 | null insts && null rules = Nothing
560 if null insts then empty else
561 hang (ptext SLIT("Warning: orphan instances:"))
562 2 (vcat (map ppr insts)),
563 if null rules then empty else
564 hang (ptext SLIT("Warning: orphan rules:"))
565 2 (vcat (map ppr rules))
569 :: (Name -> (OccName,Version)) -- get parents and versions
570 -> Module -- This module
571 -> [Usage] -- Usages from old iface
572 -> [(OccName, IfaceEq)] -- decl names, equality conditions
573 -> OccSet -- set of things that have changed
574 computeChangedOccs ver_fn this_module old_usages eq_info
575 = foldl add_changes emptyOccSet (stronglyConnComp edges)
578 -- return True if an external name has changed
579 name_changed :: Name -> Bool
581 | Just ents <- lookupUFM usg_modmap (moduleName mod)
582 = case lookupUFM ents parent_occ of
583 Nothing -> pprPanic "computeChangedOccs" (ppr nm)
584 Just v -> v < new_version
585 | otherwise = False -- must be in another package
588 (parent_occ, new_version) = ver_fn nm
590 -- Turn the usages from the old ModIface into a mapping
591 usg_modmap = listToUFM [ (usg_mod usg, listToUFM (usg_entities usg))
592 | usg <- old_usages ]
594 get_local_eq_info :: GenIfaceEq NameSet -> GenIfaceEq OccSet
595 get_local_eq_info Equal = Equal
596 get_local_eq_info NotEqual = NotEqual
597 get_local_eq_info (EqBut ns) = foldNameSet f Equal ns
598 where f name eq | nameModule name == this_module =
599 EqBut (unitOccSet (nameOccName name)) `and_occifeq` eq
600 | name_changed name = NotEqual
603 local_eq_infos = mapSnd get_local_eq_info eq_info
605 edges :: [((OccName, OccIfaceEq), Unique, [Unique])]
606 edges = [ (node, getUnique occ, map getUnique occs)
607 | node@(occ, iface_eq) <- local_eq_infos
608 , let occs = case iface_eq of
609 EqBut occ_set -> occSetElts occ_set
612 -- Changes in declarations
613 add_changes :: OccSet -> SCC (OccName, OccIfaceEq) -> OccSet
614 add_changes so_far (AcyclicSCC (occ, iface_eq))
615 | changedWrt so_far iface_eq -- This one has changed
616 = extendOccSet so_far occ
617 add_changes so_far (CyclicSCC pairs)
618 | changedWrt so_far (foldr1 and_occifeq iface_eqs)
619 -- One of this group has changed
620 = extendOccSetList so_far occs
621 where (occs, iface_eqs) = unzip pairs
622 add_changes so_far other = so_far
624 type OccIfaceEq = GenIfaceEq OccSet
626 changedWrt :: OccSet -> OccIfaceEq -> Bool
627 changedWrt so_far Equal = False
628 changedWrt so_far NotEqual = True
629 changedWrt so_far (EqBut kids) = so_far `intersectsOccSet` kids
631 changedWrtNames :: OccSet -> IfaceEq -> Bool
632 changedWrtNames so_far Equal = False
633 changedWrtNames so_far NotEqual = True
634 changedWrtNames so_far (EqBut kids) =
635 so_far `intersectsOccSet` mkOccSet (map nameOccName (nameSetToList kids))
637 and_occifeq :: OccIfaceEq -> OccIfaceEq -> OccIfaceEq
638 Equal `and_occifeq` x = x
639 NotEqual `and_occifeq` x = NotEqual
640 EqBut nms `and_occifeq` Equal = EqBut nms
641 EqBut nms `and_occifeq` NotEqual = NotEqual
642 EqBut nms1 `and_occifeq` EqBut nms2 = EqBut (nms1 `unionOccSets` nms2)
644 ----------------------
645 -- mkOrphMap partitions instance decls or rules into
646 -- (a) an OccEnv for ones that are not orphans,
647 -- mapping the local OccName to a list of its decls
648 -- (b) a list of orphan decls
649 mkOrphMap :: (decl -> Maybe OccName) -- (Just occ) for a non-orphan decl, keyed by occ
650 -- Nothing for an orphan decl
651 -> [decl] -- Sorted into canonical order
652 -> (OccEnv [decl], -- Non-orphan decls associated with their key;
653 -- each sublist in canonical order
654 [decl]) -- Orphan decls; in canonical order
655 mkOrphMap get_key decls
656 = foldl go (emptyOccEnv, []) decls
658 go (non_orphs, orphs) d
659 | Just occ <- get_key d
660 = (extendOccEnv_C (\ ds _ -> d:ds) non_orphs occ [d], orphs)
661 | otherwise = (non_orphs, d:orphs)
663 ----------------------
664 mkIfaceDeprec :: Deprecations -> IfaceDeprecs
665 mkIfaceDeprec NoDeprecs = NoDeprecs
666 mkIfaceDeprec (DeprecAll t) = DeprecAll t
667 mkIfaceDeprec (DeprecSome env) = DeprecSome (sortLe (<=) (nameEnvElts env))
669 ----------------------
670 bump_unless :: Bool -> Version -> Version
671 bump_unless True v = v -- True <=> no change
672 bump_unless False v = bumpVersion v
676 %*********************************************************
678 \subsection{Keeping track of what we've slurped, and version numbers}
680 %*********************************************************
684 mkUsageInfo :: HscEnv
685 -> ModuleEnv (Module, Bool, SrcSpan)
686 -> [(ModuleName, IsBootInterface)]
687 -> NameSet -> IO [Usage]
688 mkUsageInfo hsc_env dir_imp_mods dep_mods used_names
689 = do { eps <- hscEPS hsc_env
690 ; let usages = mk_usage_info (eps_PIT eps) hsc_env
691 dir_imp_mods dep_mods used_names
692 ; usages `seqList` return usages }
693 -- seq the list of Usages returned: occasionally these
694 -- don't get evaluated for a while and we can end up hanging on to
695 -- the entire collection of Ifaces.
697 mk_usage_info pit hsc_env dir_imp_mods dep_mods used_names
698 = mapCatMaybes mkUsage dep_mods
699 -- ToDo: do we need to sort into canonical order?
701 hpt = hsc_HPT hsc_env
702 dflags = hsc_dflags hsc_env
704 -- ent_map groups together all the things imported and used
705 -- from a particular module in this package
706 ent_map :: ModuleEnv [OccName]
707 ent_map = foldNameSet add_mv emptyModuleEnv used_names
709 | isWiredInName name = mv_map -- ignore wired-in names
711 = case nameModule_maybe name of
712 Nothing -> mv_map -- ignore internal names
713 Just mod -> extendModuleEnv_C add_item mv_map mod [occ]
715 occ = nameOccName name
716 add_item occs _ = occ:occs
718 depend_on_exports mod = case lookupModuleEnv dir_imp_mods mod of
719 Just (_,no_imp,_) -> not no_imp
722 -- We want to create a Usage for a home module if
723 -- a) we used something from; has something in used_names
724 -- b) we imported all of it, even if we used nothing from it
725 -- (need to recompile if its export list changes: export_vers)
726 -- c) is a home-package orphan or family-instance module (need to
727 -- recompile if its instance decls change: rules_vers)
728 mkUsage :: (ModuleName, IsBootInterface) -> Maybe Usage
729 mkUsage (mod_name, _)
730 | isNothing maybe_iface -- We can't depend on it if we didn't
731 || (null used_occs -- load its interface.
732 && isNothing export_vers
735 = Nothing -- Record no usage info
738 = Just (Usage { usg_name = mod_name,
740 usg_exports = export_vers,
741 usg_entities = fmToList ent_vers,
742 usg_rules = rules_vers })
744 maybe_iface = lookupIfaceByModule dflags hpt pit mod
745 -- In one-shot mode, the interfaces for home-package
746 -- modules accumulate in the PIT not HPT. Sigh.
748 mod = mkModule (thisPackage dflags) mod_name
750 Just iface = maybe_iface
751 orphan_mod = mi_orphan iface
752 finsts_mod = mi_finsts iface
753 version_env = mi_ver_fn iface
754 mod_vers = mi_mod_vers iface
755 rules_vers = mi_rule_vers iface
756 export_vers | depend_on_exports mod = Just (mi_exp_vers iface)
757 | otherwise = Nothing
759 used_occs = lookupModuleEnv ent_map mod `orElse` []
761 -- Making a FiniteMap here ensures that (a) we remove duplicates
762 -- when we have usages on several subordinates of a single parent,
763 -- and (b) that the usages emerge in a canonical order, which
764 -- is why we use FiniteMap rather than OccEnv: FiniteMap works
765 -- using Ord on the OccNames, which is a lexicographic ordering.
766 ent_vers :: FiniteMap OccName Version
767 ent_vers = listToFM (map lookup_occ used_occs)
770 case version_env occ of
771 Nothing -> pprTrace "hmm, strange" (ppr mod <+> ppr occ) $
772 (occ, initialVersion) -- does this ever happen?
773 Just (parent, version) -> (parent, version)
777 mkIfaceExports :: [AvailInfo]
778 -> [(Module, [GenAvailInfo OccName])]
779 -- Group by module and sort by occurrence
780 -- This keeps the list in canonical order
781 mkIfaceExports exports
782 = [ (mod, eltsFM avails)
783 | (mod, avails) <- fmToList groupFM
786 -- Deliberately use FiniteMap rather than UniqFM so we
787 -- get a canonical ordering
788 groupFM :: ModuleEnv (FiniteMap FastString (GenAvailInfo OccName))
789 groupFM = foldl add emptyModuleEnv exports
792 = extendModuleEnv_C add_avail env mod (unitFM avail_fs avail_occ)
794 avail_occ = availToOccs avail
795 mod = nameModule (availName avail)
796 avail_fs = occNameFS (availName avail_occ)
797 add_avail avail_fm _ = addToFM avail_fm avail_fs avail_occ
799 availToOccs (Avail n) = Avail (nameOccName n)
800 availToOccs (AvailTC tc ns) = AvailTC (nameOccName tc) (map nameOccName ns)
804 %************************************************************************
806 Load the old interface file for this module (unless
807 we have it aleady), and check whether it is up to date
810 %************************************************************************
813 checkOldIface :: HscEnv
815 -> Bool -- Source unchanged
816 -> Maybe ModIface -- Old interface from compilation manager, if any
817 -> IO (RecompileRequired, Maybe ModIface)
819 checkOldIface hsc_env mod_summary source_unchanged maybe_iface
820 = do { showPass (hsc_dflags hsc_env)
821 ("Checking old interface for " ++
822 showSDoc (ppr (ms_mod mod_summary))) ;
824 ; initIfaceCheck hsc_env $
825 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
828 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
829 = do -- CHECK WHETHER THE SOURCE HAS CHANGED
830 { ifM (not source_unchanged)
831 (traceHiDiffs (nest 4 (text "Source file changed or recompilation check turned off")))
833 -- If the source has changed and we're in interactive mode, avoid reading
834 -- an interface; just return the one we might have been supplied with.
835 ; ghc_mode <- getGhcMode
836 ; if (ghc_mode == Interactive || ghc_mode == JustTypecheck)
837 && not source_unchanged then
838 return (outOfDate, maybe_iface)
840 case maybe_iface of {
841 Just old_iface -> do -- Use the one we already have
842 { traceIf (text "We already have the old interface for" <+> ppr (ms_mod mod_summary))
843 ; recomp <- checkVersions hsc_env source_unchanged old_iface
844 ; return (recomp, Just old_iface) }
848 -- Try and read the old interface for the current module
849 -- from the .hi file left from the last time we compiled it
850 { let iface_path = msHiFilePath mod_summary
851 ; read_result <- readIface (ms_mod mod_summary) iface_path False
852 ; case read_result of {
853 Failed err -> do -- Old interface file not found, or garbled; give up
854 { traceIf (text "FYI: cannot read old interface file:"
856 ; return (outOfDate, Nothing) }
858 ; Succeeded iface -> do
860 -- We have got the old iface; check its versions
861 { traceIf (text "Read the interface file" <+> text iface_path)
862 ; recomp <- checkVersions hsc_env source_unchanged iface
863 ; returnM (recomp, Just iface)
867 @recompileRequired@ is called from the HscMain. It checks whether
868 a recompilation is required. It needs access to the persistent state,
869 finder, etc, because it may have to load lots of interface files to
870 check their versions.
873 type RecompileRequired = Bool
874 upToDate = False -- Recompile not required
875 outOfDate = True -- Recompile required
877 checkVersions :: HscEnv
878 -> Bool -- True <=> source unchanged
879 -> ModIface -- Old interface
880 -> IfG RecompileRequired
881 checkVersions hsc_env source_unchanged iface
882 | not source_unchanged
885 = do { traceHiDiffs (text "Considering whether compilation is required for" <+>
886 ppr (mi_module iface) <> colon)
888 -- Source code unchanged and no errors yet... carry on
890 -- First put the dependent-module info, read from the old interface, into the envt,
891 -- so that when we look for interfaces we look for the right one (.hi or .hi-boot)
893 -- It's just temporary because either the usage check will succeed
894 -- (in which case we are done with this module) or it'll fail (in which
895 -- case we'll compile the module from scratch anyhow).
897 -- We do this regardless of compilation mode, although in --make mode
898 -- all the dependent modules should be in the HPT already, so it's
900 ; updateEps_ $ \eps -> eps { eps_is_boot = mod_deps }
902 ; let this_pkg = thisPackage (hsc_dflags hsc_env)
903 ; checkList [checkModUsage this_pkg u | u <- mi_usages iface]
906 -- This is a bit of a hack really
907 mod_deps :: ModuleNameEnv (ModuleName, IsBootInterface)
908 mod_deps = mkModDeps (dep_mods (mi_deps iface))
910 checkModUsage :: PackageId ->Usage -> IfG RecompileRequired
911 -- Given the usage information extracted from the old
912 -- M.hi file for the module being compiled, figure out
913 -- whether M needs to be recompiled.
915 checkModUsage this_pkg (Usage { usg_name = mod_name, usg_mod = old_mod_vers,
916 usg_rules = old_rule_vers,
917 usg_exports = maybe_old_export_vers,
918 usg_entities = old_decl_vers })
919 = -- Load the imported interface is possible
921 doc_str = sep [ptext SLIT("need version info for"), ppr mod_name]
923 traceHiDiffs (text "Checking usages for module" <+> ppr mod_name) `thenM_`
926 mod = mkModule this_pkg mod_name
928 loadInterface doc_str mod ImportBySystem `thenM` \ mb_iface ->
929 -- Load the interface, but don't complain on failure;
930 -- Instead, get an Either back which we can test
933 Failed exn -> (out_of_date (sep [ptext SLIT("Can't find version number for module"),
935 -- Couldn't find or parse a module mentioned in the
936 -- old interface file. Don't complain -- it might just be that
937 -- the current module doesn't need that import and it's been deleted
941 new_mod_vers = mi_mod_vers iface
942 new_decl_vers = mi_ver_fn iface
943 new_export_vers = mi_exp_vers iface
944 new_rule_vers = mi_rule_vers iface
947 checkModuleVersion old_mod_vers new_mod_vers `thenM` \ recompile ->
948 if not recompile then
953 if checkExportList maybe_old_export_vers new_export_vers then
954 out_of_date_vers (ptext SLIT(" Export list changed"))
955 (expectJust "checkModUsage" maybe_old_export_vers)
960 if old_rule_vers /= new_rule_vers then
961 out_of_date_vers (ptext SLIT(" Rules changed"))
962 old_rule_vers new_rule_vers
965 -- CHECK ITEMS ONE BY ONE
966 checkList [checkEntityUsage new_decl_vers u | u <- old_decl_vers] `thenM` \ recompile ->
968 returnM outOfDate -- This one failed, so just bail out now
970 up_to_date (ptext SLIT(" Great! The bits I use are up to date"))
973 ------------------------
974 checkModuleVersion old_mod_vers new_mod_vers
975 | new_mod_vers == old_mod_vers
976 = up_to_date (ptext SLIT("Module version unchanged"))
979 = out_of_date_vers (ptext SLIT(" Module version has changed"))
980 old_mod_vers new_mod_vers
982 ------------------------
983 checkExportList Nothing new_vers = upToDate
984 checkExportList (Just v) new_vers = v /= new_vers
986 ------------------------
987 checkEntityUsage new_vers (name,old_vers)
988 = case new_vers name of
990 Nothing -> -- We used it before, but it ain't there now
991 out_of_date (sep [ptext SLIT("No longer exported:"), ppr name])
993 Just (_, new_vers) -- It's there, but is it up to date?
994 | new_vers == old_vers -> traceHiDiffs (text " Up to date" <+> ppr name <+> parens (ppr new_vers)) `thenM_`
996 | otherwise -> out_of_date_vers (ptext SLIT(" Out of date:") <+> ppr name)
999 up_to_date msg = traceHiDiffs msg `thenM_` returnM upToDate
1000 out_of_date msg = traceHiDiffs msg `thenM_` returnM outOfDate
1001 out_of_date_vers msg old_vers new_vers
1002 = out_of_date (hsep [msg, ppr old_vers, ptext SLIT("->"), ppr new_vers])
1004 ----------------------
1005 checkList :: [IfG RecompileRequired] -> IfG RecompileRequired
1006 -- This helper is used in two places
1007 checkList [] = returnM upToDate
1008 checkList (check:checks) = check `thenM` \ recompile ->
1015 %************************************************************************
1017 Converting things to their Iface equivalents
1019 %************************************************************************
1022 tyThingToIfaceDecl :: TyThing -> IfaceDecl
1023 -- Assumption: the thing is already tidied, so that locally-bound names
1024 -- (lambdas, for-alls) already have non-clashing OccNames
1025 -- Reason: Iface stuff uses OccNames, and the conversion here does
1026 -- not do tidying on the way
1027 tyThingToIfaceDecl (AnId id)
1028 = IfaceId { ifName = getOccName id,
1029 ifType = toIfaceType (idType id),
1032 info = case toIfaceIdInfo (idInfo id) of
1034 items -> HasInfo items
1036 tyThingToIfaceDecl (AClass clas)
1037 = IfaceClass { ifCtxt = toIfaceContext sc_theta,
1038 ifName = getOccName clas,
1039 ifTyVars = toIfaceTvBndrs clas_tyvars,
1040 ifFDs = map toIfaceFD clas_fds,
1041 ifATs = map (tyThingToIfaceDecl . ATyCon) clas_ats,
1042 ifSigs = map toIfaceClassOp op_stuff,
1043 ifRec = boolToRecFlag (isRecursiveTyCon tycon) }
1045 (clas_tyvars, clas_fds, sc_theta, _, clas_ats, op_stuff)
1046 = classExtraBigSig clas
1047 tycon = classTyCon clas
1049 toIfaceClassOp (sel_id, def_meth)
1050 = ASSERT(sel_tyvars == clas_tyvars)
1051 IfaceClassOp (getOccName sel_id) def_meth (toIfaceType op_ty)
1053 -- Be careful when splitting the type, because of things
1054 -- like class Foo a where
1055 -- op :: (?x :: String) => a -> a
1056 -- and class Baz a where
1057 -- op :: (Ord a) => a -> a
1058 (sel_tyvars, rho_ty) = splitForAllTys (idType sel_id)
1059 op_ty = funResultTy rho_ty
1061 toIfaceFD (tvs1, tvs2) = (map getFS tvs1, map getFS tvs2)
1063 tyThingToIfaceDecl (ATyCon tycon)
1065 = IfaceSyn { ifName = getOccName tycon,
1066 ifTyVars = toIfaceTvBndrs tyvars,
1067 ifOpenSyn = syn_isOpen,
1068 ifSynRhs = toIfaceType syn_tyki }
1071 = IfaceData { ifName = getOccName tycon,
1072 ifTyVars = toIfaceTvBndrs tyvars,
1073 ifCtxt = toIfaceContext (tyConStupidTheta tycon),
1074 ifCons = ifaceConDecls (algTyConRhs tycon),
1075 ifRec = boolToRecFlag (isRecursiveTyCon tycon),
1076 ifGadtSyntax = isGadtSyntaxTyCon tycon,
1077 ifGeneric = tyConHasGenerics tycon,
1078 ifFamInst = famInstToIface (tyConFamInst_maybe tycon)}
1080 | isForeignTyCon tycon
1081 = IfaceForeign { ifName = getOccName tycon,
1082 ifExtName = tyConExtName tycon }
1084 | otherwise = pprPanic "toIfaceDecl" (ppr tycon)
1086 tyvars = tyConTyVars tycon
1087 (syn_isOpen, syn_tyki) = case synTyConRhs tycon of
1088 OpenSynTyCon ki _ -> (True , ki)
1089 SynonymTyCon ty -> (False, ty)
1091 ifaceConDecls (NewTyCon { data_con = con }) =
1092 IfNewTyCon (ifaceConDecl con)
1093 ifaceConDecls (DataTyCon { data_cons = cons }) =
1094 IfDataTyCon (map ifaceConDecl cons)
1095 ifaceConDecls OpenTyCon { otIsNewtype = False } = IfOpenDataTyCon
1096 ifaceConDecls OpenTyCon { otIsNewtype = True } = IfOpenNewTyCon
1097 ifaceConDecls AbstractTyCon = IfAbstractTyCon
1098 -- The last case happens when a TyCon has been trimmed during tidying
1099 -- Furthermore, tyThingToIfaceDecl is also used
1100 -- in TcRnDriver for GHCi, when browsing a module, in which case the
1101 -- AbstractTyCon case is perfectly sensible.
1103 ifaceConDecl data_con
1104 = IfCon { ifConOcc = getOccName (dataConName data_con),
1105 ifConInfix = dataConIsInfix data_con,
1106 ifConUnivTvs = toIfaceTvBndrs (dataConUnivTyVars data_con),
1107 ifConExTvs = toIfaceTvBndrs (dataConExTyVars data_con),
1108 ifConEqSpec = to_eq_spec (dataConEqSpec data_con),
1109 ifConCtxt = toIfaceContext (dataConTheta data_con),
1110 ifConArgTys = map toIfaceType (dataConOrigArgTys data_con),
1111 ifConFields = map getOccName
1112 (dataConFieldLabels data_con),
1113 ifConStricts = dataConStrictMarks data_con }
1115 to_eq_spec spec = [(getOccName tv, toIfaceType ty) | (tv,ty) <- spec]
1117 famInstToIface Nothing = Nothing
1118 famInstToIface (Just (famTyCon, instTys)) =
1119 Just (toIfaceTyCon famTyCon, map toIfaceType instTys)
1121 tyThingToIfaceDecl (ADataCon dc)
1122 = pprPanic "toIfaceDecl" (ppr dc) -- Should be trimmed out earlier
1125 getFS x = occNameFS (getOccName x)
1127 --------------------------
1128 instanceToIfaceInst :: Instance -> IfaceInst
1129 instanceToIfaceInst ispec@(Instance { is_dfun = dfun_id, is_flag = oflag,
1130 is_cls = cls_name, is_tcs = mb_tcs })
1131 = ASSERT( cls_name == className cls )
1132 IfaceInst { ifDFun = dfun_name,
1134 ifInstCls = cls_name,
1135 ifInstTys = map do_rough mb_tcs,
1138 do_rough Nothing = Nothing
1139 do_rough (Just n) = Just (toIfaceTyCon_name n)
1141 dfun_name = idName dfun_id
1142 mod = nameModule dfun_name
1143 is_local name = nameIsLocalOrFrom mod name
1145 -- Compute orphanhood. See Note [Orphans] in IfaceSyn
1146 (_, _, cls, tys) = tcSplitDFunTy (idType dfun_id)
1147 -- Slightly awkward: we need the Class to get the fundeps
1148 (tvs, fds) = classTvsFds cls
1149 arg_names = [filterNameSet is_local (tyClsNamesOfType ty) | ty <- tys]
1150 orph | is_local cls_name = Just (nameOccName cls_name)
1151 | all isJust mb_ns = head mb_ns
1152 | otherwise = Nothing
1154 mb_ns :: [Maybe OccName] -- One for each fundep; a locally-defined name
1155 -- that is not in the "determined" arguments
1156 mb_ns | null fds = [choose_one arg_names]
1157 | otherwise = map do_one fds
1158 do_one (ltvs,rtvs) = choose_one [ns | (tv,ns) <- tvs `zip` arg_names
1159 , not (tv `elem` rtvs)]
1161 choose_one :: [NameSet] -> Maybe OccName
1162 choose_one nss = case nameSetToList (unionManyNameSets nss) of
1164 (n:ns) -> Just (nameOccName n)
1166 --------------------------
1167 famInstToIfaceFamInst :: FamInst -> IfaceFamInst
1168 famInstToIfaceFamInst fi@(FamInst { fi_tycon = tycon,
1169 fi_fam = fam, fi_tcs = mb_tcs })
1170 = IfaceFamInst { ifFamInstTyCon = toIfaceTyCon tycon
1171 , ifFamInstFam = fam
1172 , ifFamInstTys = map do_rough mb_tcs }
1174 do_rough Nothing = Nothing
1175 do_rough (Just n) = Just (toIfaceTyCon_name n)
1177 --------------------------
1178 toIfaceIdInfo :: IdInfo -> [IfaceInfoItem]
1179 toIfaceIdInfo id_info
1180 = catMaybes [arity_hsinfo, caf_hsinfo, strict_hsinfo,
1181 inline_hsinfo, wrkr_hsinfo, unfold_hsinfo]
1183 ------------ Arity --------------
1184 arity_info = arityInfo id_info
1185 arity_hsinfo | arity_info == 0 = Nothing
1186 | otherwise = Just (HsArity arity_info)
1188 ------------ Caf Info --------------
1189 caf_info = cafInfo id_info
1190 caf_hsinfo = case caf_info of
1191 NoCafRefs -> Just HsNoCafRefs
1194 ------------ Strictness --------------
1195 -- No point in explicitly exporting TopSig
1196 strict_hsinfo = case newStrictnessInfo id_info of
1197 Just sig | not (isTopSig sig) -> Just (HsStrictness sig)
1200 ------------ Worker --------------
1201 work_info = workerInfo id_info
1202 has_worker = case work_info of { HasWorker _ _ -> True; other -> False }
1203 wrkr_hsinfo = case work_info of
1204 HasWorker work_id wrap_arity ->
1205 Just (HsWorker ((idName work_id)) wrap_arity)
1208 ------------ Unfolding --------------
1209 -- The unfolding is redundant if there is a worker
1210 unfold_info = unfoldingInfo id_info
1211 rhs = unfoldingTemplate unfold_info
1212 no_unfolding = neverUnfold unfold_info
1213 -- The CoreTidy phase retains unfolding info iff
1214 -- we want to expose the unfolding, taking into account
1215 -- unconditional NOINLINE, etc. See TidyPgm.addExternal
1216 unfold_hsinfo | no_unfolding = Nothing
1217 | has_worker = Nothing -- Unfolding is implicit
1218 | otherwise = Just (HsUnfold (toIfaceExpr rhs))
1220 ------------ Inline prag --------------
1221 inline_prag = inlinePragInfo id_info
1222 inline_hsinfo | isAlwaysActive inline_prag = Nothing
1223 | no_unfolding && not has_worker = Nothing
1224 -- If the iface file give no unfolding info, we
1225 -- don't need to say when inlining is OK!
1226 | otherwise = Just (HsInline inline_prag)
1228 --------------------------
1229 coreRuleToIfaceRule :: Module -> CoreRule -> IfaceRule
1230 coreRuleToIfaceRule mod (BuiltinRule { ru_fn = fn})
1231 = pprTrace "toHsRule: builtin" (ppr fn) $
1234 coreRuleToIfaceRule mod (Rule { ru_name = name, ru_fn = fn,
1235 ru_act = act, ru_bndrs = bndrs,
1236 ru_args = args, ru_rhs = rhs })
1237 = IfaceRule { ifRuleName = name, ifActivation = act,
1238 ifRuleBndrs = map toIfaceBndr bndrs,
1240 ifRuleArgs = map do_arg args,
1241 ifRuleRhs = toIfaceExpr rhs,
1244 -- For type args we must remove synonyms from the outermost
1245 -- level. Reason: so that when we read it back in we'll
1246 -- construct the same ru_rough field as we have right now;
1248 do_arg (Type ty) = IfaceType (toIfaceType (deNoteType ty))
1249 do_arg arg = toIfaceExpr arg
1251 -- Compute orphanhood. See Note [Orphans] in IfaceSyn
1252 -- A rule is an orphan only if none of the variables
1253 -- mentioned on its left-hand side are locally defined
1254 lhs_names = fn : nameSetToList (exprsFreeNames args)
1255 -- No need to delete bndrs, because
1256 -- exprsFreeNames finds only External names
1258 orph = case filter (nameIsLocalOrFrom mod) lhs_names of
1259 (n:ns) -> Just (nameOccName n)
1262 bogusIfaceRule :: Name -> IfaceRule
1263 bogusIfaceRule id_name
1264 = IfaceRule { ifRuleName = FSLIT("bogus"), ifActivation = NeverActive,
1265 ifRuleBndrs = [], ifRuleHead = id_name, ifRuleArgs = [],
1266 ifRuleRhs = IfaceExt id_name, ifRuleOrph = Nothing }
1268 ---------------------
1269 toIfaceExpr :: CoreExpr -> IfaceExpr
1270 toIfaceExpr (Var v) = toIfaceVar v
1271 toIfaceExpr (Lit l) = IfaceLit l
1272 toIfaceExpr (Type ty) = IfaceType (toIfaceType ty)
1273 toIfaceExpr (Lam x b) = IfaceLam (toIfaceBndr x) (toIfaceExpr b)
1274 toIfaceExpr (App f a) = toIfaceApp f [a]
1275 toIfaceExpr (Case s x ty as) = IfaceCase (toIfaceExpr s) (getFS x) (toIfaceType ty) (map toIfaceAlt as)
1276 toIfaceExpr (Let b e) = IfaceLet (toIfaceBind b) (toIfaceExpr e)
1277 toIfaceExpr (Cast e co) = IfaceCast (toIfaceExpr e) (toIfaceType co)
1278 toIfaceExpr (Note n e) = IfaceNote (toIfaceNote n) (toIfaceExpr e)
1280 ---------------------
1281 toIfaceNote (SCC cc) = IfaceSCC cc
1282 toIfaceNote InlineMe = IfaceInlineMe
1283 toIfaceNote (CoreNote s) = IfaceCoreNote s
1285 ---------------------
1286 toIfaceBind (NonRec b r) = IfaceNonRec (toIfaceIdBndr b) (toIfaceExpr r)
1287 toIfaceBind (Rec prs) = IfaceRec [(toIfaceIdBndr b, toIfaceExpr r) | (b,r) <- prs]
1289 ---------------------
1290 toIfaceAlt (c,bs,r) = (toIfaceCon c, map getFS bs, toIfaceExpr r)
1292 ---------------------
1293 toIfaceCon (DataAlt dc) | isTupleTyCon tc = IfaceTupleAlt (tupleTyConBoxity tc)
1294 | otherwise = IfaceDataAlt (getName dc)
1296 tc = dataConTyCon dc
1298 toIfaceCon (LitAlt l) = IfaceLitAlt l
1299 toIfaceCon DEFAULT = IfaceDefault
1301 ---------------------
1302 toIfaceApp (App f a) as = toIfaceApp f (a:as)
1303 toIfaceApp (Var v) as
1304 = case isDataConWorkId_maybe v of
1305 -- We convert the *worker* for tuples into IfaceTuples
1306 Just dc | isTupleTyCon tc && saturated
1307 -> IfaceTuple (tupleTyConBoxity tc) tup_args
1309 val_args = dropWhile isTypeArg as
1310 saturated = val_args `lengthIs` idArity v
1311 tup_args = map toIfaceExpr val_args
1312 tc = dataConTyCon dc
1314 other -> mkIfaceApps (toIfaceVar v) as
1316 toIfaceApp e as = mkIfaceApps (toIfaceExpr e) as
1318 mkIfaceApps f as = foldl (\f a -> IfaceApp f (toIfaceExpr a)) f as
1320 ---------------------
1321 toIfaceVar :: Id -> IfaceExpr
1323 | Just fcall <- isFCallId_maybe v = IfaceFCall fcall (toIfaceType (idType v))
1324 -- Foreign calls have special syntax
1325 | isExternalName name = IfaceExt name
1326 | otherwise = IfaceLcl (getFS name)