2 % (c) The GRASP/AQUA Project, Glasgow University, 1993-1998
7 mkUsageInfo, -- Construct the usage info for a module
9 mkIface, -- Build a ModIface from a ModGuts,
10 -- including computing version information
12 writeIfaceFile, -- Write the interface file
14 checkOldIface, -- See if recompilation is required, by
15 -- comparing version information
17 tyThingToIfaceDecl -- Converting things to their Iface equivalents
21 -----------------------------------------------
22 MkIface.lhs deals with versioning
23 -----------------------------------------------
25 Here's the version-related info in an interface file
27 module Foo 8 -- module-version
28 3 -- export-list-version
30 Usages: -- Version info for what this compilation of Foo imported
31 Baz 3 -- Module version
32 [4] -- The export-list version if Foo depended on it
33 (g,2) -- Function and its version
34 (T,1) -- Type and its version
36 <version> f :: Int -> Int {- Unfolding: \x -> Wib.t[2] x -}
37 -- The [2] says that f's unfolding
38 -- mentions verison 2 of Wib.t
40 -----------------------------------------------
42 -----------------------------------------------
45 * In the mi_usages information in an interface, we record the
46 version number of each free variable of the module
48 * In mkIface, we compute the version number of each exported thing A.f
49 by comparing its A.f's info with its new info, and bumping its
50 version number if it differs. If A.f mentions B.g, and B.g's version
51 number has changed, then we count A.f as having changed too.
53 * In checkOldIface we compare the mi_usages for the module with
54 the actual version info for all each thing recorded in mi_usages
59 We count A.f as changing if its fixity changes
63 If a rule changes, we want to recompile any module that might be
64 affected by that rule. For non-orphan rules, this is relatively easy.
65 If module M defines f, and a rule for f, just arrange that the version
66 number for M.f changes if any of the rules for M.f change. Any module
67 that does not depend on M.f can't be affected by the rule-change
70 Orphan rules (ones whose 'head function' is not defined in M) are
71 harder. Here's what we do.
73 * We have a per-module orphan-rule version number which changes if
74 any orphan rule changes. (It's unaffected by non-orphan rules.)
76 * We record usage info for any orphan module 'below' this one,
77 giving the orphan-rule version number. We recompile if this
80 The net effect is that if an orphan rule changes, we recompile every
81 module above it. That's very conservative, but it's devilishly hard
82 to know what it might affect, so we just have to be conservative.
86 In an iface file we have
88 instance Eq a => Eq [a] = dfun29
91 We have a version number for dfun29, covering its unfolding
92 etc. Suppose we are compiling a module M that imports A only
93 indirectly. If typechecking M uses this instance decl, we record the
94 dependency on A.dfun29 as if it were a free variable of the module
95 (via the tcg_inst_usages accumulator). That means that A will appear
96 in M's usage list. If the shape of the instance declaration changes,
97 then so will dfun29's version, triggering a recompilation.
99 Adding an instance declaration, or changing an instance decl that is
100 not currently used, is more tricky. (This really only makes a
101 difference when we have overlapping instance decls, because then the
102 new instance decl might kick in to override the old one.) We handle
103 this in a very similar way that we handle rules above.
105 * For non-orphan instance decls, identify one locally-defined tycon/class
106 mentioned in the decl. Treat the instance decl as part of the defn of that
107 tycon/class, so that if the shape of the instance decl changes, so does the
108 tycon/class; that in turn will force recompilation of anything that uses
111 * For orphan instance decls, act the same way as for orphan rules.
112 Indeed, we use the same global orphan-rule version number.
116 mkUsageInfo figures out what the ``usage information'' for this
117 moudule is; that is, what it must record in its interface file as the
120 We produce a line for every module B below the module, A, currently being
123 to record the fact that A does import B indirectly. This is used to decide
124 to look to look for B.hi rather than B.hi-boot when compiling a module that
125 imports A. This line says that A imports B, but uses nothing in it.
126 So we'll get an early bale-out when compiling A if B's version changes.
128 The usage information records:
131 \item (a) anything reachable from its body code
132 \item (b) any module exported with a @module Foo@
133 \item (c) anything reachable from an exported item
136 Why (b)? Because if @Foo@ changes then this module's export list
137 will change, so we must recompile this module at least as far as
138 making a new interface file --- but in practice that means complete
141 Why (c)? Consider this:
143 module A( f, g ) where | module B( f ) where
144 import B( f ) | f = h 3
148 Here, @B.f@ isn't used in A. Should we nevertheless record @B.f@ in
149 @A@'s usages? Our idea is that we aren't going to touch A.hi if it is
150 *identical* to what it was before. If anything about @B.f@ changes
151 than anyone who imports @A@ should be recompiled in case they use
152 @B.f@ (they'll get an early exit if they don't). So, if anything
153 about @B.f@ changes we'd better make sure that something in A.hi
154 changes, and the convenient way to do that is to record the version
155 number @B.f@ in A.hi in the usage list. If B.f changes that'll force a
156 complete recompiation of A, which is overkill but it's the only way to
157 write a new, slightly different, A.hi.
159 But the example is tricker. Even if @B.f@ doesn't change at all,
160 @B.h@ may do so, and this change may not be reflected in @f@'s version
161 number. But with -O, a module that imports A must be recompiled if
162 @B.h@ changes! So A must record a dependency on @B.h@. So we treat
163 the occurrence of @B.f@ in the export list *just as if* it were in the
164 code of A, and thereby haul in all the stuff reachable from it.
166 *** Conclusion: if A mentions B.f in its export list,
167 behave just as if A mentioned B.f in its source code,
168 and slurp in B.f and all its transitive closure ***
170 [NB: If B was compiled with -O, but A isn't, we should really *still*
171 haul in all the unfoldings for B, in case the module that imports A *is*
172 compiled with -O. I think this is the case.]
176 #include "HsVersions.h"
178 import IfaceSyn -- All of it
179 import IfaceType ( toIfaceTvBndrs, toIfaceType, toIfaceContext )
180 import LoadIface ( readIface, loadInterface, pprModIface )
181 import Id ( Id, idName, idType, idInfo, idArity, isDataConWorkId_maybe, isFCallId_maybe )
182 import IdInfo ( IdInfo, CafInfo(..), WorkerInfo(..),
183 arityInfo, cafInfo, newStrictnessInfo,
184 workerInfo, unfoldingInfo, inlinePragInfo )
185 import NewDemand ( isTopSig )
187 import Class ( classExtraBigSig, classTyCon )
188 import TyCon ( TyCon, AlgTyConRhs(..), isRecursiveTyCon, isForeignTyCon,
189 isSynTyCon, isAlgTyCon, isPrimTyCon, isFunTyCon,
190 isTupleTyCon, tupleTyConBoxity, tyConStupidTheta,
191 tyConHasGenerics, synTyConRhs, isGadtSyntaxTyCon,
192 tyConArity, tyConTyVars, algTyConRhs, tyConExtName )
193 import DataCon ( dataConName, dataConFieldLabels, dataConStrictMarks,
194 dataConTyCon, dataConIsInfix, dataConUnivTyVars, dataConExTyVars, dataConEqSpec,
195 dataConTheta, dataConOrigArgTys )
196 import Type ( TyThing(..), splitForAllTys, funResultTy )
197 import TcType ( deNoteType )
198 import TysPrim ( alphaTyVars )
199 import InstEnv ( Instance(..) )
201 import HscTypes ( ModIface(..), ModDetails(..),
202 ModGuts(..), HscEnv(..), hscEPS, Dependencies(..), FixItem(..),
203 ModSummary(..), msHiFilePath,
204 mkIfaceDepCache, mkIfaceFixCache, mkIfaceVerCache,
206 GenAvailInfo(..), availName,
207 ExternalPackageState(..),
208 Usage(..), IsBootInterface,
209 Deprecs(..), IfaceDeprecs, Deprecations,
214 import DynFlags ( GhcMode(..), DynFlags(..), DynFlag(..), dopt )
215 import Name ( Name, nameModule, nameOccName, nameParent,
216 isExternalName, isInternalName, nameParent_maybe, isWiredInName,
217 isImplicitName, NamedThing(..) )
220 import OccName ( OccName, OccEnv, mkOccEnv, lookupOccEnv, emptyOccEnv,
222 OccSet, emptyOccSet, elemOccSet, occSetElts,
223 extendOccSet, extendOccSetList,
224 isEmptyOccSet, intersectOccSet, intersectsOccSet,
228 import BasicTypes ( Version, initialVersion, bumpVersion, isAlwaysActive,
229 Activation(..), RecFlag(..), boolToRecFlag )
231 import Util ( createDirectoryHierarchy, directoryOf, sortLe, seqList, lengthIs )
232 import BinIface ( writeBinIface )
233 import Unique ( Unique, Uniquable(..) )
234 import ErrUtils ( dumpIfSet_dyn, showPass )
235 import Digraph ( stronglyConnComp, SCC(..) )
236 import SrcLoc ( SrcSpan )
238 import PackageConfig ( PackageId )
242 import Monad ( when )
243 import List ( insert )
244 import Maybes ( orElse, mapCatMaybes, isNothing, isJust,
245 expectJust, catMaybes, MaybeErr(..) )
250 %************************************************************************
252 \subsection{Completing an interface}
254 %************************************************************************
258 -> Maybe ModIface -- The old interface, if we have it
259 -> ModGuts -- Usages, deprecations, etc
260 -> ModDetails -- The trimmed, tidied interface
261 -> IO (ModIface, -- The new one, complete with decls and versions
262 Bool) -- True <=> there was an old Iface, and the new one
263 -- is identical, so no need to write it
265 mkIface hsc_env maybe_old_iface
266 (ModGuts{ mg_module = this_mod,
270 mg_rdr_env = rdr_env,
271 mg_fix_env = fix_env,
272 mg_deprecs = src_deprecs })
273 (ModDetails{ md_insts = insts,
276 md_exports = exports })
278 -- NB: notice that mkIface does not look at the bindings
279 -- only at the TypeEnv. The previous Tidy phase has
280 -- put exactly the info into the TypeEnv that we want
281 -- to expose in the interface
283 = do { eps <- hscEPS hsc_env
284 ; let { ext_nm_rhs = mkExtNameFn hsc_env eps this_mod
285 ; ext_nm_lhs = mkLhsNameFn this_mod
287 ; decls = [ tyThingToIfaceDecl ext_nm_rhs thing
288 | thing <- typeEnvElts type_env,
289 let name = getName thing,
290 not (isImplicitName name || isWiredInName name) ]
291 -- Don't put implicit Ids and class tycons in the interface file
292 -- Nor wired-in things; the compiler knows about them anyhow
294 ; fixities = [(occ,fix) | FixItem occ fix _ <- nameEnvElts fix_env]
295 ; deprecs = mkIfaceDeprec src_deprecs
296 ; iface_rules = map (coreRuleToIfaceRule ext_nm_lhs ext_nm_rhs) rules
297 ; iface_insts = map (instanceToIfaceInst ext_nm_lhs) insts
299 ; intermediate_iface = ModIface {
300 mi_module = this_mod,
304 mi_exports = mkIfaceExports exports,
305 mi_insts = sortLe le_inst iface_insts,
306 mi_rules = sortLe le_rule iface_rules,
307 mi_fixities = fixities,
308 mi_deprecs = deprecs,
309 mi_globals = Just rdr_env,
311 -- Left out deliberately: filled in by addVersionInfo
312 mi_mod_vers = initialVersion,
313 mi_exp_vers = initialVersion,
314 mi_rule_vers = initialVersion,
315 mi_orphan = False, -- Always set by addVersionInfo, but
316 -- it's a strict field, so we can't omit it.
317 mi_decls = deliberatelyOmitted "decls",
318 mi_ver_fn = deliberatelyOmitted "ver_fn",
320 -- And build the cached values
321 mi_dep_fn = mkIfaceDepCache deprecs,
322 mi_fix_fn = mkIfaceFixCache fixities }
324 -- Add version information
325 ; (new_iface, no_change_at_all, pp_diffs, pp_orphs)
326 = _scc_ "versioninfo"
327 addVersionInfo maybe_old_iface intermediate_iface decls
331 ; when (isJust pp_orphs && dopt Opt_WarnOrphans dflags)
332 (printDump (expectJust "mkIface" pp_orphs))
333 ; when (dopt Opt_D_dump_hi_diffs dflags) (printDump pp_diffs)
334 ; dumpIfSet_dyn dflags Opt_D_dump_hi "FINAL INTERFACE"
335 (pprModIface new_iface)
337 ; return (new_iface, no_change_at_all) }
339 r1 `le_rule` r2 = ifRuleName r1 <= ifRuleName r2
340 i1 `le_inst` i2 = ifDFun i1 <= ifDFun i2
342 dflags = hsc_dflags hsc_env
343 deliberatelyOmitted x = panic ("Deliberately omitted: " ++ x)
346 -----------------------------
347 writeIfaceFile :: ModLocation -> ModIface -> IO ()
348 writeIfaceFile location new_iface
349 = do createDirectoryHierarchy (directoryOf hi_file_path)
350 writeBinIface hi_file_path new_iface
351 where hi_file_path = ml_hi_file location
354 -----------------------------
355 mkExtNameFn :: HscEnv -> ExternalPackageState -> Module -> Name -> IfaceExtName
356 mkExtNameFn hsc_env eps this_mod
359 hpt = hsc_HPT hsc_env
363 | mod == this_mod = case nameParent_maybe name of
364 Nothing -> LocalTop occ
365 Just par -> LocalTopSub occ (nameOccName par)
366 | isWiredInName name = ExtPkg mod occ
367 | is_home mod = HomePkg mod_name occ vers
368 | otherwise = ExtPkg mod occ
370 dflags = hsc_dflags hsc_env
371 this_pkg = thisPackage dflags
372 is_home mod = modulePackageId mod == this_pkg
374 mod = nameModule name
375 mod_name = moduleName mod
376 occ = nameOccName name
377 par_occ = nameOccName (nameParent name)
378 -- The version of the *parent* is the one want
379 vers = lookupVersion mod par_occ
381 lookupVersion :: Module -> OccName -> Version
382 -- Even though we're looking up a home-package thing, in
383 -- one-shot mode the imported interfaces may be in the PIT
384 lookupVersion mod occ
385 = mi_ver_fn iface occ `orElse`
386 pprPanic "lookupVers1" (ppr mod <+> ppr occ)
388 iface = lookupIfaceByModule (hsc_dflags hsc_env) hpt pit mod `orElse`
389 pprPanic "lookupVers2" (ppr mod <+> ppr occ)
392 ---------------------
393 -- mkLhsNameFn ignores versioning info altogether
394 -- It is used for the LHS of instance decls and rules, where we
395 -- there's no point in recording version info
396 mkLhsNameFn :: Module -> Name -> IfaceExtName
397 mkLhsNameFn this_mod name
398 | isInternalName name = pprTrace "mkLhsNameFn: unexpected internal" (ppr name) $
399 LocalTop occ -- Should not happen
400 | mod == this_mod = LocalTop occ
401 | otherwise = ExtPkg mod occ
403 mod = nameModule name
404 occ = nameOccName name
407 -----------------------------
408 -- Compute version numbers for local decls
410 addVersionInfo :: Maybe ModIface -- The old interface, read from M.hi
411 -> ModIface -- The new interface decls (lacking decls)
412 -> [IfaceDecl] -- The new decls
414 Bool, -- True <=> no changes at all; no need to write new Iface
416 Maybe SDoc) -- Warnings about orphans
418 addVersionInfo Nothing new_iface new_decls
419 -- No old interface, so definitely write a new one!
420 = (new_iface { mi_orphan = anyNothing ifInstOrph (mi_insts new_iface)
421 || anyNothing ifRuleOrph (mi_rules new_iface),
422 mi_decls = [(initialVersion, decl) | decl <- new_decls],
423 mi_ver_fn = \n -> Just initialVersion },
425 ptext SLIT("No old interface file"),
426 pprOrphans orph_insts orph_rules)
428 orph_insts = filter (isNothing . ifInstOrph) (mi_insts new_iface)
429 orph_rules = filter (isNothing . ifRuleOrph) (mi_rules new_iface)
431 addVersionInfo (Just old_iface@(ModIface { mi_mod_vers = old_mod_vers,
432 mi_exp_vers = old_exp_vers,
433 mi_rule_vers = old_rule_vers,
434 mi_decls = old_decls,
435 mi_ver_fn = old_decl_vers,
436 mi_fix_fn = old_fixities }))
437 new_iface@(ModIface { mi_fix_fn = new_fixities })
440 | no_change_at_all = (old_iface, True, ptext SLIT("Interface file unchanged"), pp_orphs)
441 | otherwise = (final_iface, False, vcat [ptext SLIT("Interface file has changed"),
442 nest 2 pp_diffs], pp_orphs)
444 final_iface = new_iface { mi_mod_vers = bump_unless no_output_change old_mod_vers,
445 mi_exp_vers = bump_unless no_export_change old_exp_vers,
446 mi_rule_vers = bump_unless no_rule_change old_rule_vers,
447 mi_orphan = not (null new_orph_rules && null new_orph_insts),
448 mi_decls = decls_w_vers,
449 mi_ver_fn = mkIfaceVerCache decls_w_vers }
451 decls_w_vers = [(add_vers decl, decl) | decl <- new_decls]
454 (old_non_orph_insts, old_orph_insts) = mkOrphMap ifInstOrph (mi_insts old_iface)
455 (new_non_orph_insts, new_orph_insts) = mkOrphMap ifInstOrph (mi_insts new_iface)
456 same_insts occ = eqMaybeBy (eqListBy eqIfInst)
457 (lookupOccEnv old_non_orph_insts occ)
458 (lookupOccEnv new_non_orph_insts occ)
460 (old_non_orph_rules, old_orph_rules) = mkOrphMap ifRuleOrph (mi_rules old_iface)
461 (new_non_orph_rules, new_orph_rules) = mkOrphMap ifRuleOrph (mi_rules new_iface)
462 same_rules occ = eqMaybeBy (eqListBy eqIfRule)
463 (lookupOccEnv old_non_orph_rules occ)
464 (lookupOccEnv new_non_orph_rules occ)
466 -- Computing what changed
467 no_output_change = no_decl_change && no_rule_change &&
468 no_export_change && no_deprec_change
469 no_export_change = mi_exports new_iface == mi_exports old_iface -- Kept sorted
470 no_decl_change = isEmptyOccSet changed_occs
471 no_rule_change = not (changedWrt changed_occs (eqListBy eqIfRule old_orph_rules new_orph_rules)
472 || changedWrt changed_occs (eqListBy eqIfInst old_orph_insts new_orph_insts))
473 no_deprec_change = mi_deprecs new_iface == mi_deprecs old_iface
475 -- If the usages havn't changed either, we don't need to write the interface file
476 no_other_changes = mi_usages new_iface == mi_usages old_iface &&
477 mi_deps new_iface == mi_deps old_iface
478 no_change_at_all = no_output_change && no_other_changes
480 pp_diffs = vcat [pp_change no_export_change "Export list"
481 (ppr old_exp_vers <+> arrow <+> ppr (mi_exp_vers final_iface)),
482 pp_change no_rule_change "Rules"
483 (ppr old_rule_vers <+> arrow <+> ppr (mi_rule_vers final_iface)),
484 pp_change no_deprec_change "Deprecations" empty,
485 pp_change no_other_changes "Usages" empty,
487 pp_change True what info = empty
488 pp_change False what info = text what <+> ptext SLIT("changed") <+> info
491 old_decl_env = mkOccEnv [(ifName decl, decl) | (_,decl) <- old_decls]
492 same_fixity n = bool (old_fixities n == new_fixities n)
495 -- Adding version info
496 new_version = bumpVersion old_mod_vers -- Start from the old module version, not from zero
497 -- so that if you remove f, and then add it again,
498 -- you don't thereby reduce f's version number
499 add_vers decl | occ `elemOccSet` changed_occs = new_version
500 | otherwise = expectJust "add_vers" (old_decl_vers occ)
501 -- If it's unchanged, there jolly well
502 where -- should be an old version number
506 changed_occs :: OccSet
507 changed_occs = computeChangedOccs eq_info
509 eq_info :: [(OccName, IfaceEq)]
510 eq_info = map check_eq new_decls
511 check_eq new_decl | Just old_decl <- lookupOccEnv old_decl_env occ
512 = (occ, new_decl `eqIfDecl` old_decl &&&
513 eq_indirects new_decl)
514 | otherwise {- No corresponding old decl -}
517 occ = ifName new_decl
519 eq_indirects :: IfaceDecl -> IfaceEq
520 -- When seeing if two decls are the same, remember to
521 -- check whether any relevant fixity or rules have changed
522 eq_indirects (IfaceId {ifName = occ}) = eq_ind_occ occ
523 eq_indirects (IfaceClass {ifName = cls_occ, ifSigs = sigs})
524 = same_insts cls_occ &&&
525 eq_ind_occs [op | IfaceClassOp op _ _ <- sigs]
526 eq_indirects (IfaceData {ifName = tc_occ, ifCons = cons})
527 = same_insts tc_occ &&& same_fixity tc_occ &&& -- The TyCon can have a fixity too
528 eq_ind_occs (map ifConOcc (visibleIfConDecls cons))
529 eq_indirects other = Equal -- Synonyms and foreign declarations
531 eq_ind_occ :: OccName -> IfaceEq -- For class ops and Ids; check fixity and rules
532 eq_ind_occ occ = same_fixity occ &&& same_rules occ
533 eq_ind_occs = foldr ((&&&) . eq_ind_occ) Equal
537 pp_decl_diffs :: SDoc -- Nothing => no changes
539 | isEmptyOccSet changed_occs = empty
541 = vcat [ptext SLIT("Changed occs:") <+> ppr (occSetElts changed_occs),
542 ptext SLIT("Version change for these decls:"),
543 nest 2 (vcat (map show_change new_decls))]
545 eq_env = mkOccEnv eq_info
547 | not (occ `elemOccSet` changed_occs) = empty
549 = vcat [ppr occ <+> ppr (old_decl_vers occ) <+> arrow <+> ppr new_version,
552 occ = ifName new_decl
553 why = case lookupOccEnv eq_env occ of
554 Just (EqBut occs) -> sep [ppr occ <> colon, ptext SLIT("Free vars (only) changed:"),
555 nest 2 (braces (fsep (map ppr (occSetElts
556 (occs `intersectOccSet` changed_occs)))))]
558 | Just old_decl <- lookupOccEnv old_decl_env occ
559 -> vcat [ptext SLIT("Old:") <+> ppr old_decl,
560 ptext SLIT("New:") <+> ppr new_decl]
562 -> ppr occ <+> ptext SLIT("only in new interface")
563 other -> pprPanic "MkIface.show_change" (ppr occ)
565 pp_orphs = pprOrphans new_orph_insts new_orph_rules
567 pprOrphans insts rules
568 | null insts && null rules = Nothing
571 if null insts then empty else
572 hang (ptext SLIT("Warning: orphan instances:"))
573 2 (vcat (map ppr insts)),
574 if null rules then empty else
575 hang (ptext SLIT("Warning: orphan rules:"))
576 2 (vcat (map ppr rules))
579 computeChangedOccs :: [(OccName, IfaceEq)] -> OccSet
580 computeChangedOccs eq_info
581 = foldl add_changes emptyOccSet (stronglyConnComp edges)
583 edges :: [((OccName,IfaceEq), Unique, [Unique])]
584 edges = [ (node, getUnique occ, map getUnique occs)
585 | node@(occ, iface_eq) <- eq_info
586 , let occs = case iface_eq of
587 EqBut occ_set -> occSetElts occ_set
590 -- Changes in declarations
591 add_changes :: OccSet -> SCC (OccName, IfaceEq) -> OccSet
592 add_changes so_far (AcyclicSCC (occ, iface_eq))
593 | changedWrt so_far iface_eq -- This one has changed
594 = extendOccSet so_far occ
595 add_changes so_far (CyclicSCC pairs)
596 | changedWrt so_far (foldr1 (&&&) (map snd pairs)) -- One of this group has changed
597 = extendOccSetList so_far (map fst pairs)
598 add_changes so_far other = so_far
600 changedWrt :: OccSet -> IfaceEq -> Bool
601 changedWrt so_far Equal = False
602 changedWrt so_far NotEqual = True
603 changedWrt so_far (EqBut kids) = so_far `intersectsOccSet` kids
605 ----------------------
606 -- mkOrphMap partitions instance decls or rules into
607 -- (a) an OccEnv for ones that are not orphans,
608 -- mapping the local OccName to a list of its decls
609 -- (b) a list of orphan decls
610 mkOrphMap :: (decl -> Maybe OccName) -- (Just occ) for a non-orphan decl, keyed by occ
611 -- Nothing for an orphan decl
612 -> [decl] -- Sorted into canonical order
613 -> (OccEnv [decl], -- Non-orphan decls associated with their key;
614 -- each sublist in canonical order
615 [decl]) -- Orphan decls; in canonical order
616 mkOrphMap get_key decls
617 = foldl go (emptyOccEnv, []) decls
619 go (non_orphs, orphs) d
620 | Just occ <- get_key d
621 = (extendOccEnv_C (\ ds _ -> d:ds) non_orphs occ [d], orphs)
622 | otherwise = (non_orphs, d:orphs)
624 anyNothing :: (a -> Maybe b) -> [a] -> Bool
625 anyNothing p [] = False
626 anyNothing p (x:xs) = isNothing (p x) || anyNothing p xs
628 ----------------------
629 mkIfaceDeprec :: Deprecations -> IfaceDeprecs
630 mkIfaceDeprec NoDeprecs = NoDeprecs
631 mkIfaceDeprec (DeprecAll t) = DeprecAll t
632 mkIfaceDeprec (DeprecSome env) = DeprecSome (sortLe (<=) (nameEnvElts env))
634 ----------------------
635 bump_unless :: Bool -> Version -> Version
636 bump_unless True v = v -- True <=> no change
637 bump_unless False v = bumpVersion v
641 %*********************************************************
643 \subsection{Keeping track of what we've slurped, and version numbers}
645 %*********************************************************
649 mkUsageInfo :: HscEnv
650 -> ModuleEnv (Module, Bool, SrcSpan)
651 -> [(ModuleName, IsBootInterface)]
652 -> NameSet -> IO [Usage]
653 mkUsageInfo hsc_env dir_imp_mods dep_mods used_names
654 = do { eps <- hscEPS hsc_env
655 ; let usages = mk_usage_info (eps_PIT eps) hsc_env
656 dir_imp_mods dep_mods used_names
657 ; usages `seqList` return usages }
658 -- seq the list of Usages returned: occasionally these
659 -- don't get evaluated for a while and we can end up hanging on to
660 -- the entire collection of Ifaces.
662 mk_usage_info pit hsc_env dir_imp_mods dep_mods proto_used_names
663 = mapCatMaybes mkUsage dep_mods
664 -- ToDo: do we need to sort into canonical order?
666 hpt = hsc_HPT hsc_env
667 dflags = hsc_dflags hsc_env
669 used_names = mkNameSet $ -- Eliminate duplicates
670 [ nameParent n -- Just record usage on the 'main' names
671 | n <- nameSetToList proto_used_names
672 , not (isWiredInName n) -- Don't record usages for wired-in names
673 , isExternalName n -- Ignore internal names
676 -- ent_map groups together all the things imported and used
677 -- from a particular module in this package
678 ent_map :: ModuleEnv [OccName]
679 ent_map = foldNameSet add_mv emptyModuleEnv used_names
680 add_mv name mv_map = extendModuleEnv_C add_item mv_map mod [occ]
682 occ = nameOccName name
683 mod = nameModule name
684 add_item occs _ = occ:occs
686 depend_on_exports mod = case lookupModuleEnv dir_imp_mods mod of
687 Just (_,no_imp,_) -> not no_imp
690 -- We want to create a Usage for a home module if
691 -- a) we used something from; has something in used_names
692 -- b) we imported all of it, even if we used nothing from it
693 -- (need to recompile if its export list changes: export_vers)
694 -- c) is a home-package orphan module (need to recompile if its
695 -- instance decls change: rules_vers)
696 mkUsage :: (ModuleName, IsBootInterface) -> Maybe Usage
697 mkUsage (mod_name, _)
698 | isNothing maybe_iface -- We can't depend on it if we didn't
699 || (null used_occs -- load its interface.
700 && isNothing export_vers
702 = Nothing -- Record no usage info
705 = Just (Usage { usg_name = mod_name,
707 usg_exports = export_vers,
708 usg_entities = ent_vers,
709 usg_rules = rules_vers })
711 maybe_iface = lookupIfaceByModule dflags hpt pit mod
712 -- In one-shot mode, the interfaces for home-package
713 -- modules accumulate in the PIT not HPT. Sigh.
715 mod = mkModule (thisPackage dflags) mod_name
717 Just iface = maybe_iface
718 orphan_mod = mi_orphan iface
719 version_env = mi_ver_fn iface
720 mod_vers = mi_mod_vers iface
721 rules_vers = mi_rule_vers iface
722 export_vers | depend_on_exports mod = Just (mi_exp_vers iface)
723 | otherwise = Nothing
725 -- The sort is to put them into canonical order
726 used_occs = lookupModuleEnv ent_map mod `orElse` []
727 ent_vers :: [(OccName,Version)]
728 ent_vers = [ (occ, version_env occ `orElse` initialVersion)
729 | occ <- sortLe (<=) used_occs]
733 mkIfaceExports :: NameSet -> [(Module, [GenAvailInfo OccName])]
734 -- Group by module and sort by occurrence
735 -- This keeps the list in canonical order
736 mkIfaceExports exports
737 = [ (mod, eltsUFM avails)
738 | (mod, avails) <- fmToList groupFM
741 groupFM :: ModuleEnv (UniqFM (GenAvailInfo OccName))
742 -- Deliberately use the FastString so we
743 -- get a canonical ordering
744 groupFM = foldl add emptyModuleEnv (nameSetToList exports)
746 add env name = extendModuleEnv_C add_avail env mod
747 (unitUFM avail_fs avail)
749 occ = nameOccName name
750 mod = nameModule name
751 avail | Just p <- nameParent_maybe name = AvailTC (nameOccName p) [occ]
752 | isTcOcc occ = AvailTC occ [occ]
753 | otherwise = Avail occ
754 avail_fs = occNameFS (availName avail)
755 add_avail avail_fm _ = addToUFM_C add_item avail_fm avail_fs avail
757 add_item (AvailTC p occs) _ = AvailTC p (List.insert occ occs)
758 add_item (Avail n) _ = pprPanic "MkIface.addAvail" (ppr n <+> ppr name)
762 %************************************************************************
764 Load the old interface file for this module (unless
765 we have it aleady), and check whether it is up to date
768 %************************************************************************
771 checkOldIface :: HscEnv
773 -> Bool -- Source unchanged
774 -> Maybe ModIface -- Old interface from compilation manager, if any
775 -> IO (RecompileRequired, Maybe ModIface)
777 checkOldIface hsc_env mod_summary source_unchanged maybe_iface
778 = do { showPass (hsc_dflags hsc_env)
779 ("Checking old interface for " ++
780 showSDoc (ppr (ms_mod mod_summary))) ;
782 ; initIfaceCheck hsc_env $
783 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
786 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
787 = -- CHECK WHETHER THE SOURCE HAS CHANGED
788 ifM (not source_unchanged)
789 (traceHiDiffs (nest 4 (text "Source file changed or recompilation check turned off")))
792 -- If the source has changed and we're in interactive mode, avoid reading
793 -- an interface; just return the one we might have been supplied with.
794 getGhcMode `thenM` \ ghc_mode ->
795 if (ghc_mode == Interactive || ghc_mode == JustTypecheck)
796 && not source_unchanged then
797 returnM (outOfDate, maybe_iface)
800 case maybe_iface of {
801 Just old_iface -> do -- Use the one we already have
802 recomp <- checkVersions hsc_env source_unchanged old_iface
803 return (recomp, Just old_iface)
807 -- Try and read the old interface for the current module
808 -- from the .hi file left from the last time we compiled it
810 iface_path = msHiFilePath mod_summary
812 readIface (ms_mod mod_summary) iface_path False `thenM` \ read_result ->
813 case read_result of {
814 Failed err -> -- Old interface file not found, or garbled; give up
815 traceIf (text "FYI: cannot read old interface file:"
816 $$ nest 4 err) `thenM_`
817 returnM (outOfDate, Nothing)
821 -- We have got the old iface; check its versions
822 checkVersions hsc_env source_unchanged iface `thenM` \ recomp ->
823 returnM (recomp, Just iface)
827 @recompileRequired@ is called from the HscMain. It checks whether
828 a recompilation is required. It needs access to the persistent state,
829 finder, etc, because it may have to load lots of interface files to
830 check their versions.
833 type RecompileRequired = Bool
834 upToDate = False -- Recompile not required
835 outOfDate = True -- Recompile required
837 checkVersions :: HscEnv
838 -> Bool -- True <=> source unchanged
839 -> ModIface -- Old interface
840 -> IfG RecompileRequired
841 checkVersions hsc_env source_unchanged iface
842 | not source_unchanged
845 = do { traceHiDiffs (text "Considering whether compilation is required for" <+>
846 ppr (mi_module iface) <> colon)
848 -- Source code unchanged and no errors yet... carry on
850 -- First put the dependent-module info, read from the old interface, into the envt,
851 -- so that when we look for interfaces we look for the right one (.hi or .hi-boot)
853 -- It's just temporary because either the usage check will succeed
854 -- (in which case we are done with this module) or it'll fail (in which
855 -- case we'll compile the module from scratch anyhow).
857 -- We do this regardless of compilation mode
858 ; updateEps_ $ \eps -> eps { eps_is_boot = mod_deps }
860 ; let this_pkg = thisPackage (hsc_dflags hsc_env)
861 ; checkList [checkModUsage this_pkg u | u <- mi_usages iface]
864 -- This is a bit of a hack really
865 mod_deps :: ModuleNameEnv (ModuleName, IsBootInterface)
866 mod_deps = mkModDeps (dep_mods (mi_deps iface))
868 checkModUsage :: PackageId ->Usage -> IfG RecompileRequired
869 -- Given the usage information extracted from the old
870 -- M.hi file for the module being compiled, figure out
871 -- whether M needs to be recompiled.
873 checkModUsage this_pkg (Usage { usg_name = mod_name, usg_mod = old_mod_vers,
874 usg_rules = old_rule_vers,
875 usg_exports = maybe_old_export_vers,
876 usg_entities = old_decl_vers })
877 = -- Load the imported interface is possible
879 doc_str = sep [ptext SLIT("need version info for"), ppr mod_name]
881 traceHiDiffs (text "Checking usages for module" <+> ppr mod_name) `thenM_`
884 mod = mkModule this_pkg mod_name
886 loadInterface doc_str mod ImportBySystem `thenM` \ mb_iface ->
887 -- Load the interface, but don't complain on failure;
888 -- Instead, get an Either back which we can test
891 Failed exn -> (out_of_date (sep [ptext SLIT("Can't find version number for module"),
893 -- Couldn't find or parse a module mentioned in the
894 -- old interface file. Don't complain -- it might just be that
895 -- the current module doesn't need that import and it's been deleted
899 new_mod_vers = mi_mod_vers iface
900 new_decl_vers = mi_ver_fn iface
901 new_export_vers = mi_exp_vers iface
902 new_rule_vers = mi_rule_vers iface
905 checkModuleVersion old_mod_vers new_mod_vers `thenM` \ recompile ->
906 if not recompile then
911 if checkExportList maybe_old_export_vers new_export_vers then
912 out_of_date_vers (ptext SLIT(" Export list changed"))
913 (expectJust "checkModUsage" maybe_old_export_vers)
918 if old_rule_vers /= new_rule_vers then
919 out_of_date_vers (ptext SLIT(" Rules changed"))
920 old_rule_vers new_rule_vers
923 -- CHECK ITEMS ONE BY ONE
924 checkList [checkEntityUsage new_decl_vers u | u <- old_decl_vers] `thenM` \ recompile ->
926 returnM outOfDate -- This one failed, so just bail out now
928 up_to_date (ptext SLIT(" Great! The bits I use are up to date"))
931 ------------------------
932 checkModuleVersion old_mod_vers new_mod_vers
933 | new_mod_vers == old_mod_vers
934 = up_to_date (ptext SLIT("Module version unchanged"))
937 = out_of_date_vers (ptext SLIT(" Module version has changed"))
938 old_mod_vers new_mod_vers
940 ------------------------
941 checkExportList Nothing new_vers = upToDate
942 checkExportList (Just v) new_vers = v /= new_vers
944 ------------------------
945 checkEntityUsage new_vers (name,old_vers)
946 = case new_vers name of
948 Nothing -> -- We used it before, but it ain't there now
949 out_of_date (sep [ptext SLIT("No longer exported:"), ppr name])
951 Just new_vers -- It's there, but is it up to date?
952 | new_vers == old_vers -> traceHiDiffs (text " Up to date" <+> ppr name <+> parens (ppr new_vers)) `thenM_`
954 | otherwise -> out_of_date_vers (ptext SLIT(" Out of date:") <+> ppr name)
957 up_to_date msg = traceHiDiffs msg `thenM_` returnM upToDate
958 out_of_date msg = traceHiDiffs msg `thenM_` returnM outOfDate
959 out_of_date_vers msg old_vers new_vers
960 = out_of_date (hsep [msg, ppr old_vers, ptext SLIT("->"), ppr new_vers])
962 ----------------------
963 checkList :: [IfG RecompileRequired] -> IfG RecompileRequired
964 -- This helper is used in two places
965 checkList [] = returnM upToDate
966 checkList (check:checks) = check `thenM` \ recompile ->
973 %************************************************************************
975 Converting things to their Iface equivalents
977 %************************************************************************
980 tyThingToIfaceDecl :: (Name -> IfaceExtName) -> TyThing -> IfaceDecl
981 -- Assumption: the thing is already tidied, so that locally-bound names
982 -- (lambdas, for-alls) already have non-clashing OccNames
983 -- Reason: Iface stuff uses OccNames, and the conversion here does
984 -- not do tidying on the way
985 tyThingToIfaceDecl ext (AnId id)
986 = IfaceId { ifName = getOccName id,
987 ifType = toIfaceType ext (idType id),
990 info = case toIfaceIdInfo ext (idInfo id) of
992 items -> HasInfo items
994 tyThingToIfaceDecl ext (AClass clas)
995 = IfaceClass { ifCtxt = toIfaceContext ext sc_theta,
996 ifName = getOccName clas,
997 ifTyVars = toIfaceTvBndrs clas_tyvars,
998 ifFDs = map toIfaceFD clas_fds,
999 ifSigs = map toIfaceClassOp op_stuff,
1000 ifRec = boolToRecFlag (isRecursiveTyCon tycon) }
1002 (clas_tyvars, clas_fds, sc_theta, _, op_stuff) = classExtraBigSig clas
1003 tycon = classTyCon clas
1005 toIfaceClassOp (sel_id, def_meth)
1006 = ASSERT(sel_tyvars == clas_tyvars)
1007 IfaceClassOp (getOccName sel_id) def_meth (toIfaceType ext op_ty)
1009 -- Be careful when splitting the type, because of things
1010 -- like class Foo a where
1011 -- op :: (?x :: String) => a -> a
1012 -- and class Baz a where
1013 -- op :: (Ord a) => a -> a
1014 (sel_tyvars, rho_ty) = splitForAllTys (idType sel_id)
1015 op_ty = funResultTy rho_ty
1017 toIfaceFD (tvs1, tvs2) = (map (occNameFS.getOccName) tvs1, map (occNameFS.getOccName) tvs2)
1019 tyThingToIfaceDecl ext (ATyCon tycon)
1021 = IfaceSyn { ifName = getOccName tycon,
1022 ifTyVars = toIfaceTvBndrs tyvars,
1023 ifSynRhs = toIfaceType ext syn_ty }
1026 = IfaceData { ifName = getOccName tycon,
1027 ifTyVars = toIfaceTvBndrs tyvars,
1028 ifCtxt = toIfaceContext ext (tyConStupidTheta tycon),
1029 ifCons = ifaceConDecls (algTyConRhs tycon),
1030 ifRec = boolToRecFlag (isRecursiveTyCon tycon),
1031 ifGadtSyntax = isGadtSyntaxTyCon tycon,
1032 ifGeneric = tyConHasGenerics tycon }
1034 | isForeignTyCon tycon
1035 = IfaceForeign { ifName = getOccName tycon,
1036 ifExtName = tyConExtName tycon }
1038 | isPrimTyCon tycon || isFunTyCon tycon
1039 -- Needed in GHCi for ':info Int#', for example
1040 = IfaceData { ifName = getOccName tycon,
1041 ifTyVars = toIfaceTvBndrs (take (tyConArity tycon) alphaTyVars),
1043 ifCons = IfAbstractTyCon,
1044 ifGadtSyntax = False,
1046 ifRec = NonRecursive}
1048 | otherwise = pprPanic "toIfaceDecl" (ppr tycon)
1050 tyvars = tyConTyVars tycon
1051 syn_ty = synTyConRhs tycon
1053 ifaceConDecls (NewTyCon { data_con = con }) = IfNewTyCon (ifaceConDecl con)
1054 ifaceConDecls (DataTyCon { data_cons = cons }) = IfDataTyCon (map ifaceConDecl cons)
1055 ifaceConDecls AbstractTyCon = IfAbstractTyCon
1056 -- The last case happens when a TyCon has been trimmed during tidying
1057 -- Furthermore, tyThingToIfaceDecl is also used
1058 -- in TcRnDriver for GHCi, when browsing a module, in which case the
1059 -- AbstractTyCon case is perfectly sensible.
1061 ifaceConDecl data_con
1062 = IfCon { ifConOcc = getOccName (dataConName data_con),
1063 ifConInfix = dataConIsInfix data_con,
1064 ifConUnivTvs = toIfaceTvBndrs (dataConUnivTyVars data_con),
1065 ifConExTvs = toIfaceTvBndrs (dataConExTyVars data_con),
1066 ifConEqSpec = to_eq_spec (dataConEqSpec data_con),
1067 ifConCtxt = toIfaceContext ext (dataConTheta data_con),
1068 ifConArgTys = map (toIfaceType ext) (dataConOrigArgTys data_con),
1069 ifConFields = map getOccName (dataConFieldLabels data_con),
1070 ifConStricts = dataConStrictMarks data_con }
1072 to_eq_spec spec = [(getOccName tv, toIfaceType ext ty) | (tv,ty) <- spec]
1074 tyThingToIfaceDecl ext (ADataCon dc)
1075 = pprPanic "toIfaceDecl" (ppr dc) -- Should be trimmed out earlier
1078 --------------------------
1079 instanceToIfaceInst :: (Name -> IfaceExtName) -> Instance -> IfaceInst
1080 instanceToIfaceInst ext_lhs ispec@(Instance { is_dfun = dfun_id, is_flag = oflag,
1081 is_cls = cls, is_tcs = mb_tcs,
1083 = IfaceInst { ifDFun = getOccName dfun_id,
1085 ifInstCls = ext_lhs cls,
1086 ifInstTys = map do_rough mb_tcs,
1089 do_rough Nothing = Nothing
1090 do_rough (Just n) = Just (toIfaceTyCon_name ext_lhs n)
1092 --------------------------
1093 toIfaceIdInfo :: (Name -> IfaceExtName) -> IdInfo -> [IfaceInfoItem]
1094 toIfaceIdInfo ext id_info
1095 = catMaybes [arity_hsinfo, caf_hsinfo, strict_hsinfo,
1096 inline_hsinfo, wrkr_hsinfo, unfold_hsinfo]
1098 ------------ Arity --------------
1099 arity_info = arityInfo id_info
1100 arity_hsinfo | arity_info == 0 = Nothing
1101 | otherwise = Just (HsArity arity_info)
1103 ------------ Caf Info --------------
1104 caf_info = cafInfo id_info
1105 caf_hsinfo = case caf_info of
1106 NoCafRefs -> Just HsNoCafRefs
1109 ------------ Strictness --------------
1110 -- No point in explicitly exporting TopSig
1111 strict_hsinfo = case newStrictnessInfo id_info of
1112 Just sig | not (isTopSig sig) -> Just (HsStrictness sig)
1115 ------------ Worker --------------
1116 work_info = workerInfo id_info
1117 has_worker = case work_info of { HasWorker _ _ -> True; other -> False }
1118 wrkr_hsinfo = case work_info of
1119 HasWorker work_id wrap_arity ->
1120 Just (HsWorker (ext (idName work_id)) wrap_arity)
1123 ------------ Unfolding --------------
1124 -- The unfolding is redundant if there is a worker
1125 unfold_info = unfoldingInfo id_info
1126 rhs = unfoldingTemplate unfold_info
1127 no_unfolding = neverUnfold unfold_info
1128 -- The CoreTidy phase retains unfolding info iff
1129 -- we want to expose the unfolding, taking into account
1130 -- unconditional NOINLINE, etc. See TidyPgm.addExternal
1131 unfold_hsinfo | no_unfolding = Nothing
1132 | has_worker = Nothing -- Unfolding is implicit
1133 | otherwise = Just (HsUnfold (toIfaceExpr ext rhs))
1135 ------------ Inline prag --------------
1136 inline_prag = inlinePragInfo id_info
1137 inline_hsinfo | isAlwaysActive inline_prag = Nothing
1138 | no_unfolding && not has_worker = Nothing
1139 -- If the iface file give no unfolding info, we
1140 -- don't need to say when inlining is OK!
1141 | otherwise = Just (HsInline inline_prag)
1143 --------------------------
1144 coreRuleToIfaceRule :: (Name -> IfaceExtName) -- For the LHS names
1145 -> (Name -> IfaceExtName) -- For the RHS names
1146 -> CoreRule -> IfaceRule
1147 coreRuleToIfaceRule ext_lhs ext_rhs (BuiltinRule { ru_fn = fn})
1148 = pprTrace "toHsRule: builtin" (ppr fn) $
1149 bogusIfaceRule (mkIfaceExtName fn)
1151 coreRuleToIfaceRule ext_lhs ext_rhs
1152 (Rule { ru_name = name, ru_fn = fn, ru_act = act, ru_bndrs = bndrs,
1153 ru_args = args, ru_rhs = rhs, ru_orph = orph })
1154 = IfaceRule { ifRuleName = name, ifActivation = act,
1155 ifRuleBndrs = map (toIfaceBndr ext_lhs) bndrs,
1156 ifRuleHead = ext_lhs fn,
1157 ifRuleArgs = map do_arg args,
1158 ifRuleRhs = toIfaceExpr ext_rhs rhs,
1161 -- For type args we must remove synonyms from the outermost
1162 -- level. Reason: so that when we read it back in we'll
1163 -- construct the same ru_rough field as we have right now;
1165 do_arg (Type ty) = IfaceType (toIfaceType ext_lhs (deNoteType ty))
1166 do_arg arg = toIfaceExpr ext_lhs arg
1168 bogusIfaceRule :: IfaceExtName -> IfaceRule
1169 bogusIfaceRule id_name
1170 = IfaceRule { ifRuleName = FSLIT("bogus"), ifActivation = NeverActive,
1171 ifRuleBndrs = [], ifRuleHead = id_name, ifRuleArgs = [],
1172 ifRuleRhs = IfaceExt id_name, ifRuleOrph = Nothing }
1174 ---------------------
1175 toIfaceExpr :: (Name -> IfaceExtName) -> CoreExpr -> IfaceExpr
1176 toIfaceExpr ext (Var v) = toIfaceVar ext v
1177 toIfaceExpr ext (Lit l) = IfaceLit l
1178 toIfaceExpr ext (Type ty) = IfaceType (toIfaceType ext ty)
1179 toIfaceExpr ext (Lam x b) = IfaceLam (toIfaceBndr ext x) (toIfaceExpr ext b)
1180 toIfaceExpr ext (App f a) = toIfaceApp ext f [a]
1181 toIfaceExpr ext (Case s x ty as) = IfaceCase (toIfaceExpr ext s) (occNameFS (getOccName x)) (toIfaceType ext ty) (map (toIfaceAlt ext) as)
1182 toIfaceExpr ext (Let b e) = IfaceLet (toIfaceBind ext b) (toIfaceExpr ext e)
1183 toIfaceExpr ext (Cast e co) = IfaceCast (toIfaceExpr ext e) (toIfaceType ext co)
1184 toIfaceExpr ext (Note n e) = IfaceNote (toIfaceNote ext n) (toIfaceExpr ext e)
1186 ---------------------
1187 toIfaceNote ext (SCC cc) = IfaceSCC cc
1188 toIfaceNote ext InlineMe = IfaceInlineMe
1189 toIfaceNote ext (CoreNote s) = IfaceCoreNote s
1191 ---------------------
1192 toIfaceBind ext (NonRec b r) = IfaceNonRec (toIfaceIdBndr ext b) (toIfaceExpr ext r)
1193 toIfaceBind ext (Rec prs) = IfaceRec [(toIfaceIdBndr ext b, toIfaceExpr ext r) | (b,r) <- prs]
1195 ---------------------
1196 toIfaceAlt ext (c,bs,r) = (toIfaceCon c, map (occNameFS.getOccName) bs, toIfaceExpr ext r)
1198 ---------------------
1199 toIfaceCon (DataAlt dc) | isTupleTyCon tc = IfaceTupleAlt (tupleTyConBoxity tc)
1200 | otherwise = IfaceDataAlt (getOccName dc)
1202 tc = dataConTyCon dc
1204 toIfaceCon (LitAlt l) = IfaceLitAlt l
1205 toIfaceCon DEFAULT = IfaceDefault
1207 ---------------------
1208 toIfaceApp ext (App f a) as = toIfaceApp ext f (a:as)
1209 toIfaceApp ext (Var v) as
1210 = case isDataConWorkId_maybe v of
1211 -- We convert the *worker* for tuples into IfaceTuples
1212 Just dc | isTupleTyCon tc && saturated
1213 -> IfaceTuple (tupleTyConBoxity tc) tup_args
1215 val_args = dropWhile isTypeArg as
1216 saturated = val_args `lengthIs` idArity v
1217 tup_args = map (toIfaceExpr ext) val_args
1218 tc = dataConTyCon dc
1220 other -> mkIfaceApps ext (toIfaceVar ext v) as
1222 toIfaceApp ext e as = mkIfaceApps ext (toIfaceExpr ext e) as
1224 mkIfaceApps ext f as = foldl (\f a -> IfaceApp f (toIfaceExpr ext a)) f as
1226 ---------------------
1227 toIfaceVar :: (Name -> IfaceExtName) -> Id -> IfaceExpr
1229 | Just fcall <- isFCallId_maybe v = IfaceFCall fcall (toIfaceType ext (idType v))
1230 -- Foreign calls have special syntax
1231 | isExternalName name = IfaceExt (ext name)
1232 | otherwise = IfaceLcl (occNameFS (nameOccName name))