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
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(..), SynTyConRhs(..),
189 isRecursiveTyCon, isForeignTyCon,
190 isSynTyCon, isAlgTyCon, isPrimTyCon, isFunTyCon,
191 isTupleTyCon, tupleTyConBoxity, tyConStupidTheta,
192 tyConHasGenerics, synTyConRhs, isGadtSyntaxTyCon,
193 tyConArity, tyConTyVars, algTyConRhs, tyConExtName,
195 import DataCon ( dataConName, dataConFieldLabels, dataConStrictMarks,
196 dataConTyCon, dataConIsInfix, dataConUnivTyVars,
197 dataConExTyVars, dataConEqSpec, dataConTheta,
199 import Type ( TyThing(..), splitForAllTys, funResultTy )
200 import TcType ( deNoteType )
201 import TysPrim ( alphaTyVars )
202 import InstEnv ( Instance(..) )
203 import FamInstEnv ( FamInst(..) )
205 import HscTypes ( ModIface(..), ModDetails(..),
206 ModGuts(..), HscEnv(..), hscEPS, Dependencies(..),
208 ModSummary(..), msHiFilePath,
209 mkIfaceDepCache, mkIfaceFixCache, mkIfaceVerCache,
211 GenAvailInfo(..), availName, AvailInfo,
212 ExternalPackageState(..),
213 Usage(..), IsBootInterface,
214 Deprecs(..), IfaceDeprecs, Deprecations,
215 lookupIfaceByModule, isImplicitTyThing
219 import DynFlags ( GhcMode(..), DynFlags(..), DynFlag(..), dopt )
220 import Name ( Name, nameModule, nameModule_maybe, nameOccName,
221 isExternalName, isInternalName, isWiredInName,
225 import OccName ( OccName, OccEnv, mkOccEnv, lookupOccEnv, emptyOccEnv,
227 OccSet, emptyOccSet, elemOccSet, occSetElts,
228 extendOccSet, extendOccSetList, mkOccSet,
229 isEmptyOccSet, intersectOccSet, intersectsOccSet,
230 unionOccSets, unitOccSet,
233 import BinIface ( readBinIface, writeBinIface, v_IgnoreHiWay )
234 import Unique ( Unique, Uniquable(..) )
235 import ErrUtils ( dumpIfSet_dyn, showPass )
236 import Digraph ( stronglyConnComp, SCC(..) )
237 import SrcLoc ( SrcSpan )
238 import PackageConfig ( PackageId )
240 import BasicTypes hiding ( SuccessFlag(..) )
242 import Util hiding ( eqListBy )
246 import Data.List ( partition )
247 import DATA_IOREF ( writeIORef )
248 import Monad ( when )
249 import List ( insert )
250 import Maybes ( orElse, mapCatMaybes, isNothing, isJust,
251 expectJust, catMaybes, MaybeErr(..) )
256 %************************************************************************
258 \subsection{Completing an interface}
260 %************************************************************************
264 -> Maybe ModIface -- The old interface, if we have it
265 -> ModGuts -- Usages, deprecations, etc
266 -> ModDetails -- The trimmed, tidied interface
267 -> IO (ModIface, -- The new one, complete with decls and versions
268 Bool) -- True <=> there was an old Iface, and the new one
269 -- is identical, so no need to write it
271 mkIface hsc_env maybe_old_iface
272 (ModGuts{ mg_module = this_mod,
276 mg_rdr_env = rdr_env,
277 mg_fix_env = fix_env,
278 mg_deprecs = src_deprecs })
279 (ModDetails{ md_insts = insts,
280 md_fam_insts = fam_insts,
283 md_exports = exports })
285 -- NB: notice that mkIface does not look at the bindings
286 -- only at the TypeEnv. The previous Tidy phase has
287 -- put exactly the info into the TypeEnv that we want
288 -- to expose in the interface
290 = do { eps <- hscEPS hsc_env
291 ; let { entities = typeEnvElts type_env ;
292 decls = [ tyThingToIfaceDecl entity
293 | entity <- entities,
294 not (isImplicitTyThing entity
295 || isWiredInName (getName entity)) ]
296 -- Don't put implicit Ids and class tycons in
297 -- the interface file, Nor wired-in things; the
298 -- compiler knows about them anyhow
300 ; fixities = [(occ,fix) | FixItem occ fix _ <- nameEnvElts fix_env]
301 ; deprecs = mkIfaceDeprec src_deprecs
302 ; iface_rules = map coreRuleToIfaceRule rules
303 ; iface_insts = map instanceToIfaceInst insts
304 ; iface_fam_insts = map famInstToIfaceFamInst fam_insts
306 ; intermediate_iface = ModIface {
307 mi_module = this_mod,
311 mi_exports = mkIfaceExports exports,
312 mi_insts = sortLe le_inst iface_insts,
313 mi_fam_insts= sortLe le_fam_inst iface_fam_insts,
314 mi_rules = sortLe le_rule iface_rules,
315 mi_fixities = fixities,
316 mi_deprecs = deprecs,
317 mi_globals = Just rdr_env,
319 -- Left out deliberately: filled in by addVersionInfo
320 mi_mod_vers = initialVersion,
321 mi_exp_vers = initialVersion,
322 mi_rule_vers = initialVersion,
323 mi_orphan = False, -- Always set by addVersionInfo, but
324 -- it's a strict field, so we can't omit it.
325 mi_decls = deliberatelyOmitted "decls",
326 mi_ver_fn = deliberatelyOmitted "ver_fn",
328 -- And build the cached values
329 mi_dep_fn = mkIfaceDepCache deprecs,
330 mi_fix_fn = mkIfaceFixCache fixities }
332 -- Add version information
333 ; ext_ver_fn = mkParentVerFun hsc_env eps
334 ; (new_iface, no_change_at_all, pp_diffs, pp_orphs)
335 = _scc_ "versioninfo"
336 addVersionInfo ext_ver_fn maybe_old_iface
337 intermediate_iface decls
341 ; when (isJust pp_orphs && dopt Opt_WarnOrphans dflags)
342 (printDump (expectJust "mkIface" pp_orphs))
343 ; when (dopt Opt_D_dump_hi_diffs dflags) (printDump pp_diffs)
344 ; dumpIfSet_dyn dflags Opt_D_dump_hi "FINAL INTERFACE"
345 (pprModIface new_iface)
347 ; return (new_iface, no_change_at_all) }
349 r1 `le_rule` r2 = ifRuleName r1 <= ifRuleName r2
350 i1 `le_inst` i2 = ifDFun i1 <= ifDFun i2
351 i1 `le_fam_inst` i2 = ifFamInstTyConOcc i1 <= ifFamInstTyConOcc i2
353 dflags = hsc_dflags hsc_env
354 deliberatelyOmitted x = panic ("Deliberately omitted: " ++ x)
355 ifFamInstTyConOcc = nameOccName . ifaceTyConName . ifFamInstTyCon
358 -----------------------------
359 writeIfaceFile :: DynFlags -> ModLocation -> ModIface -> IO ()
360 writeIfaceFile dflags location new_iface
361 = do createDirectoryHierarchy (directoryOf hi_file_path)
362 writeBinIface dflags hi_file_path new_iface
363 where hi_file_path = ml_hi_file location
366 -- -----------------------------------------------------------------------------
367 -- Look up parents and versions of Names
369 -- This is like a global version of the mi_ver_fn field in each ModIface.
370 -- Given a Name, it finds the ModIface, and then uses mi_ver_fn to get
371 -- the parent and version info.
374 :: HscEnv -- needed to look up versions
375 -> ExternalPackageState -- ditto
376 -> (Name -> (OccName,Version))
377 mkParentVerFun hsc_env eps
380 mod = nameModule name
381 occ = nameOccName name
382 iface = lookupIfaceByModule (hsc_dflags hsc_env) hpt pit mod `orElse`
383 pprPanic "lookupVers2" (ppr mod <+> ppr occ)
385 mi_ver_fn iface occ `orElse`
386 pprPanic "lookupVers1" (ppr mod <+> ppr occ)
388 hpt = hsc_HPT hsc_env
391 -----------------------------------------------------------------------------
392 -- Compute version numbers for local decls
395 :: (Name -> (OccName,Version)) -- lookup parents and versions of names
396 -> Maybe ModIface -- The old interface, read from M.hi
397 -> ModIface -- The new interface (lacking decls)
398 -> [IfaceDecl] -- The new decls
399 -> (ModIface, -- Updated interface
400 Bool, -- True <=> no changes at all; no need to write Iface
402 Maybe SDoc) -- Warnings about orphans
404 addVersionInfo ver_fn Nothing new_iface new_decls
405 -- No old interface, so definitely write a new one!
406 = (new_iface { mi_orphan = anyNothing ifInstOrph (mi_insts new_iface)
407 || anyNothing ifRuleOrph (mi_rules new_iface),
408 mi_decls = [(initialVersion, decl) | decl <- new_decls],
409 mi_ver_fn = mkIfaceVerCache (zip (repeat initialVersion) new_decls)},
411 ptext SLIT("No old interface file"),
412 pprOrphans orph_insts orph_rules)
414 orph_insts = filter (isNothing . ifInstOrph) (mi_insts new_iface)
415 orph_rules = filter (isNothing . ifRuleOrph) (mi_rules new_iface)
417 addVersionInfo ver_fn (Just old_iface@(ModIface {
418 mi_mod_vers = old_mod_vers,
419 mi_exp_vers = old_exp_vers,
420 mi_rule_vers = old_rule_vers,
421 mi_decls = old_decls,
422 mi_ver_fn = old_decl_vers,
423 mi_fix_fn = old_fixities }))
424 new_iface@(ModIface { mi_fix_fn = new_fixities })
427 = (old_iface, True, ptext SLIT("Interface file unchanged"), pp_orphs)
429 = (final_iface, False, vcat [ptext SLIT("Interface file has changed"),
430 nest 2 pp_diffs], pp_orphs)
432 final_iface = new_iface {
433 mi_mod_vers = bump_unless no_output_change old_mod_vers,
434 mi_exp_vers = bump_unless no_export_change old_exp_vers,
435 mi_rule_vers = bump_unless no_rule_change old_rule_vers,
436 mi_orphan = not (null new_orph_rules && null new_orph_insts),
437 mi_decls = decls_w_vers,
438 mi_ver_fn = mkIfaceVerCache decls_w_vers }
440 decls_w_vers = [(add_vers decl, decl) | decl <- new_decls]
443 (old_non_orph_insts, old_orph_insts) =
444 mkOrphMap ifInstOrph (mi_insts old_iface)
445 (new_non_orph_insts, new_orph_insts) =
446 mkOrphMap ifInstOrph (mi_insts new_iface)
447 same_insts occ = eqMaybeBy (eqListBy eqIfInst)
448 (lookupOccEnv old_non_orph_insts occ)
449 (lookupOccEnv new_non_orph_insts occ)
451 (old_non_orph_rules, old_orph_rules) =
452 mkOrphMap ifRuleOrph (mi_rules old_iface)
453 (new_non_orph_rules, new_orph_rules) =
454 mkOrphMap ifRuleOrph (mi_rules new_iface)
455 same_rules occ = eqMaybeBy (eqListBy eqIfRule)
456 (lookupOccEnv old_non_orph_rules occ)
457 (lookupOccEnv new_non_orph_rules occ)
459 -- Computing what changed
460 no_output_change = no_decl_change && no_rule_change &&
461 no_export_change && no_deprec_change
462 no_export_change = mi_exports new_iface == mi_exports old_iface
464 no_decl_change = isEmptyOccSet changed_occs
465 no_rule_change = not (changedWrtNames changed_occs (eqListBy eqIfRule old_orph_rules new_orph_rules)
466 || changedWrtNames changed_occs (eqListBy eqIfInst old_orph_insts new_orph_insts))
467 no_deprec_change = mi_deprecs new_iface == mi_deprecs old_iface
469 -- If the usages havn't changed either, we don't need to write the interface file
470 no_other_changes = mi_usages new_iface == mi_usages old_iface &&
471 mi_deps new_iface == mi_deps old_iface
472 no_change_at_all = no_output_change && no_other_changes
474 pp_diffs = vcat [pp_change no_export_change "Export list"
475 (ppr old_exp_vers <+> arrow <+> ppr (mi_exp_vers final_iface)),
476 pp_change no_rule_change "Rules"
477 (ppr old_rule_vers <+> arrow <+> ppr (mi_rule_vers final_iface)),
478 pp_change no_deprec_change "Deprecations" empty,
479 pp_change no_other_changes "Usages" empty,
481 pp_change True what info = empty
482 pp_change False what info = text what <+> ptext SLIT("changed") <+> info
485 old_decl_env = mkOccEnv [(ifName decl, decl) | (_,decl) <- old_decls]
486 same_fixity n = bool (old_fixities n == new_fixities n)
489 -- Adding version info
490 new_version = bumpVersion old_mod_vers
491 -- Start from the old module version, not from
492 -- zero so that if you remove f, and then add
493 -- it again, you don't thereby reduce f's
496 add_vers decl | occ `elemOccSet` changed_occs = new_version
497 | otherwise = snd (expectJust "add_vers" (old_decl_vers occ))
498 -- If it's unchanged, there jolly well
499 where -- should be an old version number
503 -- Deciding which declarations have changed
505 -- For each local decl, the IfaceEq gives the list of things that
506 -- must be unchanged for the declaration as a whole to be unchanged.
507 eq_info :: [(OccName, IfaceEq)]
508 eq_info = map check_eq new_decls
510 | Just old_decl <- lookupOccEnv old_decl_env occ
511 = (occ, new_decl `eqIfDecl` old_decl &&& eq_indirects new_decl)
512 | otherwise {- No corresponding old decl -}
515 occ = ifName new_decl
517 eq_indirects :: IfaceDecl -> IfaceEq
518 -- When seeing if two decls are the same, remember to
519 -- check whether any relevant fixity or rules have changed
520 eq_indirects (IfaceId {ifName = occ}) = eq_ind_occ occ
521 eq_indirects (IfaceClass {ifName = cls_occ, ifSigs = sigs})
522 = same_insts cls_occ &&&
523 eq_ind_occs [op | IfaceClassOp op _ _ <- sigs]
524 eq_indirects (IfaceData {ifName = tc_occ, ifCons = cons})
525 = same_insts tc_occ &&& same_fixity tc_occ &&& -- The TyCon can have a fixity too
526 eq_ind_occs (map ifConOcc (visibleIfConDecls cons))
527 eq_indirects other = Equal -- Synonyms and foreign declarations
529 eq_ind_occ :: OccName -> IfaceEq -- For class ops and Ids; check fixity and rules
530 eq_ind_occ occ = same_fixity occ &&& same_rules occ
531 eq_ind_occs = foldr ((&&&) . eq_ind_occ) Equal
533 -- The Occs of declarations that changed.
534 changed_occs :: OccSet
535 changed_occs = computeChangedOccs ver_fn (mi_module new_iface)
536 (mi_usages old_iface) eq_info
540 pp_decl_diffs :: SDoc -- Nothing => no changes
542 | isEmptyOccSet changed_occs = empty
544 = vcat [ptext SLIT("Changed occs:") <+> ppr (occSetElts changed_occs),
545 ptext SLIT("Version change for these decls:"),
546 nest 2 (vcat (map show_change new_decls))]
548 eq_env = mkOccEnv eq_info
550 | not (occ `elemOccSet` changed_occs) = empty
552 = vcat [ppr occ <+> ppr (old_decl_vers occ) <+> arrow <+> ppr new_version,
555 occ = ifName new_decl
556 why = case lookupOccEnv eq_env occ of
557 Just (EqBut names) -> sep [ppr occ <> colon, ptext SLIT("Free vars (only) changed:"),
558 nest 2 (braces (fsep (map ppr (occSetElts
559 (occs `intersectOccSet` changed_occs)))))]
560 where occs = mkOccSet (map nameOccName (nameSetToList names))
562 | Just old_decl <- lookupOccEnv old_decl_env occ
563 -> vcat [ptext SLIT("Old:") <+> ppr old_decl,
564 ptext SLIT("New:") <+> ppr new_decl]
566 -> ppr occ <+> ptext SLIT("only in new interface")
567 other -> pprPanic "MkIface.show_change" (ppr occ)
569 pp_orphs = pprOrphans new_orph_insts new_orph_rules
572 pprOrphans insts rules
573 | null insts && null rules = Nothing
576 if null insts then empty else
577 hang (ptext SLIT("Warning: orphan instances:"))
578 2 (vcat (map ppr insts)),
579 if null rules then empty else
580 hang (ptext SLIT("Warning: orphan rules:"))
581 2 (vcat (map ppr rules))
585 :: (Name -> (OccName,Version)) -- get parents and versions
586 -> Module -- This module
587 -> [Usage] -- Usages from old iface
588 -> [(OccName, IfaceEq)] -- decl names, equality conditions
589 -> OccSet -- set of things that have changed
590 computeChangedOccs ver_fn this_module old_usages eq_info
591 = foldl add_changes emptyOccSet (stronglyConnComp edges)
594 -- return True if an external name has changed
595 name_changed :: Name -> Bool
597 | Just ents <- lookupUFM usg_modmap (moduleName mod)
598 = case lookupUFM ents parent_occ of
599 Nothing -> pprPanic "computeChangedOccs" (ppr nm)
600 Just v -> v < new_version
601 | otherwise = False -- must be in another package
604 (parent_occ, new_version) = ver_fn nm
606 -- Turn the usages from the old ModIface into a mapping
607 usg_modmap = listToUFM [ (usg_mod usg, listToUFM (usg_entities usg))
608 | usg <- old_usages ]
610 get_local_eq_info :: GenIfaceEq NameSet -> GenIfaceEq OccSet
611 get_local_eq_info Equal = Equal
612 get_local_eq_info NotEqual = NotEqual
613 get_local_eq_info (EqBut ns) = foldNameSet f Equal ns
614 where f name eq | nameModule name == this_module =
615 EqBut (unitOccSet (nameOccName name)) `and_occifeq` eq
616 | name_changed name = NotEqual
619 local_eq_infos = mapSnd get_local_eq_info eq_info
621 edges :: [((OccName, OccIfaceEq), Unique, [Unique])]
622 edges = [ (node, getUnique occ, map getUnique occs)
623 | node@(occ, iface_eq) <- local_eq_infos
624 , let occs = case iface_eq of
625 EqBut occ_set -> occSetElts occ_set
628 -- Changes in declarations
629 add_changes :: OccSet -> SCC (OccName, OccIfaceEq) -> OccSet
630 add_changes so_far (AcyclicSCC (occ, iface_eq))
631 | changedWrt so_far iface_eq -- This one has changed
632 = extendOccSet so_far occ
633 add_changes so_far (CyclicSCC pairs)
634 | changedWrt so_far (foldr1 and_occifeq iface_eqs)
635 -- One of this group has changed
636 = extendOccSetList so_far occs
637 where (occs, iface_eqs) = unzip pairs
638 add_changes so_far other = so_far
640 type OccIfaceEq = GenIfaceEq OccSet
642 changedWrt :: OccSet -> OccIfaceEq -> Bool
643 changedWrt so_far Equal = False
644 changedWrt so_far NotEqual = True
645 changedWrt so_far (EqBut kids) = so_far `intersectsOccSet` kids
647 changedWrtNames :: OccSet -> IfaceEq -> Bool
648 changedWrtNames so_far Equal = False
649 changedWrtNames so_far NotEqual = True
650 changedWrtNames so_far (EqBut kids) =
651 so_far `intersectsOccSet` mkOccSet (map nameOccName (nameSetToList kids))
653 and_occifeq :: OccIfaceEq -> OccIfaceEq -> OccIfaceEq
654 Equal `and_occifeq` x = x
655 NotEqual `and_occifeq` x = NotEqual
656 EqBut nms `and_occifeq` Equal = EqBut nms
657 EqBut nms `and_occifeq` NotEqual = NotEqual
658 EqBut nms1 `and_occifeq` EqBut nms2 = EqBut (nms1 `unionOccSets` nms2)
660 ----------------------
661 -- mkOrphMap partitions instance decls or rules into
662 -- (a) an OccEnv for ones that are not orphans,
663 -- mapping the local OccName to a list of its decls
664 -- (b) a list of orphan decls
665 mkOrphMap :: (decl -> Maybe OccName) -- (Just occ) for a non-orphan decl, keyed by occ
666 -- Nothing for an orphan decl
667 -> [decl] -- Sorted into canonical order
668 -> (OccEnv [decl], -- Non-orphan decls associated with their key;
669 -- each sublist in canonical order
670 [decl]) -- Orphan decls; in canonical order
671 mkOrphMap get_key decls
672 = foldl go (emptyOccEnv, []) decls
674 go (non_orphs, orphs) d
675 | Just occ <- get_key d
676 = (extendOccEnv_C (\ ds _ -> d:ds) non_orphs occ [d], orphs)
677 | otherwise = (non_orphs, d:orphs)
679 anyNothing :: (a -> Maybe b) -> [a] -> Bool
680 anyNothing p [] = False
681 anyNothing p (x:xs) = isNothing (p x) || anyNothing p xs
683 ----------------------
684 mkIfaceDeprec :: Deprecations -> IfaceDeprecs
685 mkIfaceDeprec NoDeprecs = NoDeprecs
686 mkIfaceDeprec (DeprecAll t) = DeprecAll t
687 mkIfaceDeprec (DeprecSome env) = DeprecSome (sortLe (<=) (nameEnvElts env))
689 ----------------------
690 bump_unless :: Bool -> Version -> Version
691 bump_unless True v = v -- True <=> no change
692 bump_unless False v = bumpVersion v
696 %*********************************************************
698 \subsection{Keeping track of what we've slurped, and version numbers}
700 %*********************************************************
704 mkUsageInfo :: HscEnv
705 -> ModuleEnv (Module, Bool, SrcSpan)
706 -> [(ModuleName, IsBootInterface)]
707 -> NameSet -> IO [Usage]
708 mkUsageInfo hsc_env dir_imp_mods dep_mods used_names
709 = do { eps <- hscEPS hsc_env
710 ; let usages = mk_usage_info (eps_PIT eps) hsc_env
711 dir_imp_mods dep_mods used_names
712 ; usages `seqList` return usages }
713 -- seq the list of Usages returned: occasionally these
714 -- don't get evaluated for a while and we can end up hanging on to
715 -- the entire collection of Ifaces.
717 mk_usage_info pit hsc_env dir_imp_mods dep_mods used_names
718 = mapCatMaybes mkUsage dep_mods
719 -- ToDo: do we need to sort into canonical order?
721 hpt = hsc_HPT hsc_env
722 dflags = hsc_dflags hsc_env
724 -- ent_map groups together all the things imported and used
725 -- from a particular module in this package
726 ent_map :: ModuleEnv [OccName]
727 ent_map = foldNameSet add_mv emptyModuleEnv used_names
729 | isWiredInName name = mv_map -- ignore wired-in names
731 = case nameModule_maybe name of
732 Nothing -> mv_map -- ignore internal names
733 Just mod -> extendModuleEnv_C add_item mv_map mod [occ]
735 occ = nameOccName name
736 add_item occs _ = occ:occs
738 depend_on_exports mod = case lookupModuleEnv dir_imp_mods mod of
739 Just (_,no_imp,_) -> not no_imp
742 -- We want to create a Usage for a home module if
743 -- a) we used something from; has something in used_names
744 -- b) we imported all of it, even if we used nothing from it
745 -- (need to recompile if its export list changes: export_vers)
746 -- c) is a home-package orphan module (need to recompile if its
747 -- instance decls change: rules_vers)
748 mkUsage :: (ModuleName, IsBootInterface) -> Maybe Usage
749 mkUsage (mod_name, _)
750 | isNothing maybe_iface -- We can't depend on it if we didn't
751 || (null used_occs -- load its interface.
752 && isNothing export_vers
754 = Nothing -- Record no usage info
757 = Just (Usage { usg_name = mod_name,
759 usg_exports = export_vers,
760 usg_entities = fmToList ent_vers,
761 usg_rules = rules_vers })
763 maybe_iface = lookupIfaceByModule dflags hpt pit mod
764 -- In one-shot mode, the interfaces for home-package
765 -- modules accumulate in the PIT not HPT. Sigh.
767 mod = mkModule (thisPackage dflags) mod_name
769 Just iface = maybe_iface
770 orphan_mod = mi_orphan iface
771 version_env = mi_ver_fn iface
772 mod_vers = mi_mod_vers iface
773 rules_vers = mi_rule_vers iface
774 export_vers | depend_on_exports mod = Just (mi_exp_vers iface)
775 | otherwise = Nothing
777 used_occs = lookupModuleEnv ent_map mod `orElse` []
779 -- Making a FiniteMap here ensures that (a) we remove duplicates
780 -- when we have usages on several subordinates of a single parent,
781 -- and (b) that the usages emerge in a canonical order, which
782 -- is why we use FiniteMap rather than OccEnv: FiniteMap works
783 -- using Ord on the OccNames, which is a lexicographic ordering.
784 ent_vers :: FiniteMap OccName Version
785 ent_vers = listToFM (map lookup_occ used_occs)
788 case version_env occ of
789 Nothing -> pprTrace "hmm, strange" (ppr mod <+> ppr occ) $
790 (occ, initialVersion) -- does this ever happen?
791 Just (parent, version) -> (parent, version)
795 mkIfaceExports :: [AvailInfo]
796 -> [(Module, [GenAvailInfo OccName])]
797 -- Group by module and sort by occurrence
798 -- This keeps the list in canonical order
799 mkIfaceExports exports
800 = [ (mod, eltsFM avails)
801 | (mod, avails) <- fmToList groupFM
804 -- Deliberately use FiniteMap rather than UniqFM so we
805 -- get a canonical ordering
806 groupFM :: ModuleEnv (FiniteMap FastString (GenAvailInfo OccName))
807 groupFM = foldl add emptyModuleEnv exports
810 = extendModuleEnv_C add_avail env mod (unitFM avail_fs avail_occ)
812 avail_occ = availToOccs avail
813 mod = nameModule (availName avail)
814 avail_fs = occNameFS (availName avail_occ)
815 add_avail avail_fm _ = addToFM avail_fm avail_fs avail_occ
817 availToOccs (Avail n) = Avail (nameOccName n)
818 availToOccs (AvailTC tc ns) = AvailTC (nameOccName tc) (map nameOccName ns)
822 %************************************************************************
824 Load the old interface file for this module (unless
825 we have it aleady), and check whether it is up to date
828 %************************************************************************
831 checkOldIface :: HscEnv
833 -> Bool -- Source unchanged
834 -> Maybe ModIface -- Old interface from compilation manager, if any
835 -> IO (RecompileRequired, Maybe ModIface)
837 checkOldIface hsc_env mod_summary source_unchanged maybe_iface
838 = do { showPass (hsc_dflags hsc_env)
839 ("Checking old interface for " ++
840 showSDoc (ppr (ms_mod mod_summary))) ;
842 ; initIfaceCheck hsc_env $
843 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
846 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
847 = do -- CHECK WHETHER THE SOURCE HAS CHANGED
848 { ifM (not source_unchanged)
849 (traceHiDiffs (nest 4 (text "Source file changed or recompilation check turned off")))
851 -- If the source has changed and we're in interactive mode, avoid reading
852 -- an interface; just return the one we might have been supplied with.
853 ; ghc_mode <- getGhcMode
854 ; if (ghc_mode == Interactive || ghc_mode == JustTypecheck)
855 && not source_unchanged then
856 return (outOfDate, maybe_iface)
858 case maybe_iface of {
859 Just old_iface -> do -- Use the one we already have
860 { traceIf (text "We already have the old interface for" <+> ppr (ms_mod mod_summary))
861 ; recomp <- checkVersions hsc_env source_unchanged old_iface
862 ; return (recomp, Just old_iface) }
866 -- Try and read the old interface for the current module
867 -- from the .hi file left from the last time we compiled it
868 { let iface_path = msHiFilePath mod_summary
869 ; read_result <- readIface (ms_mod mod_summary) iface_path False
870 ; case read_result of {
871 Failed err -> do -- Old interface file not found, or garbled; give up
872 { traceIf (text "FYI: cannot read old interface file:"
874 ; return (outOfDate, Nothing) }
876 ; Succeeded iface -> do
878 -- We have got the old iface; check its versions
879 { traceIf (text "Read the interface file" <+> text iface_path)
880 ; recomp <- checkVersions hsc_env source_unchanged iface
881 ; returnM (recomp, Just iface)
885 @recompileRequired@ is called from the HscMain. It checks whether
886 a recompilation is required. It needs access to the persistent state,
887 finder, etc, because it may have to load lots of interface files to
888 check their versions.
891 type RecompileRequired = Bool
892 upToDate = False -- Recompile not required
893 outOfDate = True -- Recompile required
895 checkVersions :: HscEnv
896 -> Bool -- True <=> source unchanged
897 -> ModIface -- Old interface
898 -> IfG RecompileRequired
899 checkVersions hsc_env source_unchanged iface
900 | not source_unchanged
903 = do { traceHiDiffs (text "Considering whether compilation is required for" <+>
904 ppr (mi_module iface) <> colon)
906 -- Source code unchanged and no errors yet... carry on
908 -- First put the dependent-module info, read from the old interface, into the envt,
909 -- so that when we look for interfaces we look for the right one (.hi or .hi-boot)
911 -- It's just temporary because either the usage check will succeed
912 -- (in which case we are done with this module) or it'll fail (in which
913 -- case we'll compile the module from scratch anyhow).
915 -- We do this regardless of compilation mode, although in --make mode
916 -- all the dependent modules should be in the HPT already, so it's
918 ; updateEps_ $ \eps -> eps { eps_is_boot = mod_deps }
920 ; let this_pkg = thisPackage (hsc_dflags hsc_env)
921 ; checkList [checkModUsage this_pkg u | u <- mi_usages iface]
924 -- This is a bit of a hack really
925 mod_deps :: ModuleNameEnv (ModuleName, IsBootInterface)
926 mod_deps = mkModDeps (dep_mods (mi_deps iface))
928 checkModUsage :: PackageId ->Usage -> IfG RecompileRequired
929 -- Given the usage information extracted from the old
930 -- M.hi file for the module being compiled, figure out
931 -- whether M needs to be recompiled.
933 checkModUsage this_pkg (Usage { usg_name = mod_name, usg_mod = old_mod_vers,
934 usg_rules = old_rule_vers,
935 usg_exports = maybe_old_export_vers,
936 usg_entities = old_decl_vers })
937 = -- Load the imported interface is possible
939 doc_str = sep [ptext SLIT("need version info for"), ppr mod_name]
941 traceHiDiffs (text "Checking usages for module" <+> ppr mod_name) `thenM_`
944 mod = mkModule this_pkg mod_name
946 loadInterface doc_str mod ImportBySystem `thenM` \ mb_iface ->
947 -- Load the interface, but don't complain on failure;
948 -- Instead, get an Either back which we can test
951 Failed exn -> (out_of_date (sep [ptext SLIT("Can't find version number for module"),
953 -- Couldn't find or parse a module mentioned in the
954 -- old interface file. Don't complain -- it might just be that
955 -- the current module doesn't need that import and it's been deleted
959 new_mod_vers = mi_mod_vers iface
960 new_decl_vers = mi_ver_fn iface
961 new_export_vers = mi_exp_vers iface
962 new_rule_vers = mi_rule_vers iface
965 checkModuleVersion old_mod_vers new_mod_vers `thenM` \ recompile ->
966 if not recompile then
971 if checkExportList maybe_old_export_vers new_export_vers then
972 out_of_date_vers (ptext SLIT(" Export list changed"))
973 (expectJust "checkModUsage" maybe_old_export_vers)
978 if old_rule_vers /= new_rule_vers then
979 out_of_date_vers (ptext SLIT(" Rules changed"))
980 old_rule_vers new_rule_vers
983 -- CHECK ITEMS ONE BY ONE
984 checkList [checkEntityUsage new_decl_vers u | u <- old_decl_vers] `thenM` \ recompile ->
986 returnM outOfDate -- This one failed, so just bail out now
988 up_to_date (ptext SLIT(" Great! The bits I use are up to date"))
991 ------------------------
992 checkModuleVersion old_mod_vers new_mod_vers
993 | new_mod_vers == old_mod_vers
994 = up_to_date (ptext SLIT("Module version unchanged"))
997 = out_of_date_vers (ptext SLIT(" Module version has changed"))
998 old_mod_vers new_mod_vers
1000 ------------------------
1001 checkExportList Nothing new_vers = upToDate
1002 checkExportList (Just v) new_vers = v /= new_vers
1004 ------------------------
1005 checkEntityUsage new_vers (name,old_vers)
1006 = case new_vers name of
1008 Nothing -> -- We used it before, but it ain't there now
1009 out_of_date (sep [ptext SLIT("No longer exported:"), ppr name])
1011 Just (_, new_vers) -- It's there, but is it up to date?
1012 | new_vers == old_vers -> traceHiDiffs (text " Up to date" <+> ppr name <+> parens (ppr new_vers)) `thenM_`
1014 | otherwise -> out_of_date_vers (ptext SLIT(" Out of date:") <+> ppr name)
1017 up_to_date msg = traceHiDiffs msg `thenM_` returnM upToDate
1018 out_of_date msg = traceHiDiffs msg `thenM_` returnM outOfDate
1019 out_of_date_vers msg old_vers new_vers
1020 = out_of_date (hsep [msg, ppr old_vers, ptext SLIT("->"), ppr new_vers])
1022 ----------------------
1023 checkList :: [IfG RecompileRequired] -> IfG RecompileRequired
1024 -- This helper is used in two places
1025 checkList [] = returnM upToDate
1026 checkList (check:checks) = check `thenM` \ recompile ->
1033 %************************************************************************
1035 Converting things to their Iface equivalents
1037 %************************************************************************
1040 tyThingToIfaceDecl :: TyThing -> IfaceDecl
1041 -- Assumption: the thing is already tidied, so that locally-bound names
1042 -- (lambdas, for-alls) already have non-clashing OccNames
1043 -- Reason: Iface stuff uses OccNames, and the conversion here does
1044 -- not do tidying on the way
1045 tyThingToIfaceDecl (AnId id)
1046 = IfaceId { ifName = getOccName id,
1047 ifType = toIfaceType (idType id),
1050 info = case toIfaceIdInfo (idInfo id) of
1052 items -> HasInfo items
1054 tyThingToIfaceDecl (AClass clas)
1055 = IfaceClass { ifCtxt = toIfaceContext sc_theta,
1056 ifName = getOccName clas,
1057 ifTyVars = toIfaceTvBndrs clas_tyvars,
1058 ifFDs = map toIfaceFD clas_fds,
1059 ifATs = map (tyThingToIfaceDecl . ATyCon) clas_ats,
1060 ifSigs = map toIfaceClassOp op_stuff,
1061 ifRec = boolToRecFlag (isRecursiveTyCon tycon) }
1063 (clas_tyvars, clas_fds, sc_theta, _, clas_ats, op_stuff)
1064 = classExtraBigSig clas
1065 tycon = classTyCon clas
1067 toIfaceClassOp (sel_id, def_meth)
1068 = ASSERT(sel_tyvars == clas_tyvars)
1069 IfaceClassOp (getOccName sel_id) def_meth (toIfaceType op_ty)
1071 -- Be careful when splitting the type, because of things
1072 -- like class Foo a where
1073 -- op :: (?x :: String) => a -> a
1074 -- and class Baz a where
1075 -- op :: (Ord a) => a -> a
1076 (sel_tyvars, rho_ty) = splitForAllTys (idType sel_id)
1077 op_ty = funResultTy rho_ty
1079 toIfaceFD (tvs1, tvs2) = (map getFS tvs1, map getFS tvs2)
1081 tyThingToIfaceDecl (ATyCon tycon)
1083 = IfaceSyn { ifName = getOccName tycon,
1084 ifTyVars = toIfaceTvBndrs tyvars,
1085 ifOpenSyn = syn_isOpen,
1086 ifSynRhs = toIfaceType syn_tyki }
1089 = IfaceData { ifName = getOccName tycon,
1090 ifTyVars = toIfaceTvBndrs tyvars,
1091 ifCtxt = toIfaceContext (tyConStupidTheta tycon),
1092 ifCons = ifaceConDecls (algTyConRhs tycon),
1093 ifRec = boolToRecFlag (isRecursiveTyCon tycon),
1094 ifGadtSyntax = isGadtSyntaxTyCon tycon,
1095 ifGeneric = tyConHasGenerics tycon,
1096 ifFamInst = famInstToIface (tyConFamInst_maybe tycon)}
1098 | isForeignTyCon tycon
1099 = IfaceForeign { ifName = getOccName tycon,
1100 ifExtName = tyConExtName tycon }
1102 | isPrimTyCon tycon || isFunTyCon tycon
1103 -- Needed in GHCi for ':info Int#', for example
1104 = IfaceData { ifName = getOccName tycon,
1105 ifTyVars = toIfaceTvBndrs (take (tyConArity tycon) alphaTyVars),
1107 ifCons = IfAbstractTyCon,
1108 ifGadtSyntax = False,
1110 ifRec = NonRecursive,
1111 ifFamInst = Nothing }
1113 | otherwise = pprPanic "toIfaceDecl" (ppr tycon)
1115 tyvars = tyConTyVars tycon
1116 (syn_isOpen, syn_tyki) = case synTyConRhs tycon of
1117 OpenSynTyCon ki -> (True , ki)
1118 SynonymTyCon ty -> (False, ty)
1120 ifaceConDecls (NewTyCon { data_con = con }) =
1121 IfNewTyCon (ifaceConDecl con)
1122 ifaceConDecls (DataTyCon { data_cons = cons }) =
1123 IfDataTyCon (map ifaceConDecl cons)
1124 ifaceConDecls OpenDataTyCon = IfOpenDataTyCon
1125 ifaceConDecls OpenNewTyCon = IfOpenNewTyCon
1126 ifaceConDecls AbstractTyCon = IfAbstractTyCon
1127 -- The last case happens when a TyCon has been trimmed during tidying
1128 -- Furthermore, tyThingToIfaceDecl is also used
1129 -- in TcRnDriver for GHCi, when browsing a module, in which case the
1130 -- AbstractTyCon case is perfectly sensible.
1132 ifaceConDecl data_con
1133 = IfCon { ifConOcc = getOccName (dataConName data_con),
1134 ifConInfix = dataConIsInfix data_con,
1135 ifConUnivTvs = toIfaceTvBndrs (dataConUnivTyVars data_con),
1136 ifConExTvs = toIfaceTvBndrs (dataConExTyVars data_con),
1137 ifConEqSpec = to_eq_spec (dataConEqSpec data_con),
1138 ifConCtxt = toIfaceContext (dataConTheta data_con),
1139 ifConArgTys = map toIfaceType (dataConOrigArgTys data_con),
1140 ifConFields = map getOccName
1141 (dataConFieldLabels data_con),
1142 ifConStricts = dataConStrictMarks data_con }
1144 to_eq_spec spec = [(getOccName tv, toIfaceType ty) | (tv,ty) <- spec]
1146 famInstToIface Nothing = Nothing
1147 famInstToIface (Just (famTyCon, instTys)) =
1148 Just (toIfaceTyCon famTyCon, map toIfaceType instTys)
1150 tyThingToIfaceDecl (ADataCon dc)
1151 = pprPanic "toIfaceDecl" (ppr dc) -- Should be trimmed out earlier
1154 getFS x = occNameFS (getOccName x)
1156 --------------------------
1157 instanceToIfaceInst :: Instance -> IfaceInst
1158 instanceToIfaceInst ispec@(Instance { is_dfun = dfun_id, is_flag = oflag,
1159 is_cls = cls, is_tcs = mb_tcs,
1161 = IfaceInst { ifDFun = getName dfun_id,
1164 ifInstTys = map do_rough mb_tcs,
1167 do_rough Nothing = Nothing
1168 do_rough (Just n) = Just (toIfaceTyCon_name n)
1170 --------------------------
1171 famInstToIfaceFamInst :: FamInst -> IfaceFamInst
1172 famInstToIfaceFamInst fi@(FamInst { fi_tycon = tycon,
1173 fi_fam = fam, fi_tcs = mb_tcs })
1174 = IfaceFamInst { ifFamInstTyCon = toIfaceTyCon tycon
1175 , ifFamInstFam = fam
1176 , ifFamInstTys = map do_rough mb_tcs }
1178 do_rough Nothing = Nothing
1179 do_rough (Just n) = Just (toIfaceTyCon_name n)
1181 --------------------------
1182 toIfaceIdInfo :: IdInfo -> [IfaceInfoItem]
1183 toIfaceIdInfo id_info
1184 = catMaybes [arity_hsinfo, caf_hsinfo, strict_hsinfo,
1185 inline_hsinfo, wrkr_hsinfo, unfold_hsinfo]
1187 ------------ Arity --------------
1188 arity_info = arityInfo id_info
1189 arity_hsinfo | arity_info == 0 = Nothing
1190 | otherwise = Just (HsArity arity_info)
1192 ------------ Caf Info --------------
1193 caf_info = cafInfo id_info
1194 caf_hsinfo = case caf_info of
1195 NoCafRefs -> Just HsNoCafRefs
1198 ------------ Strictness --------------
1199 -- No point in explicitly exporting TopSig
1200 strict_hsinfo = case newStrictnessInfo id_info of
1201 Just sig | not (isTopSig sig) -> Just (HsStrictness sig)
1204 ------------ Worker --------------
1205 work_info = workerInfo id_info
1206 has_worker = case work_info of { HasWorker _ _ -> True; other -> False }
1207 wrkr_hsinfo = case work_info of
1208 HasWorker work_id wrap_arity ->
1209 Just (HsWorker ((idName work_id)) wrap_arity)
1212 ------------ Unfolding --------------
1213 -- The unfolding is redundant if there is a worker
1214 unfold_info = unfoldingInfo id_info
1215 rhs = unfoldingTemplate unfold_info
1216 no_unfolding = neverUnfold unfold_info
1217 -- The CoreTidy phase retains unfolding info iff
1218 -- we want to expose the unfolding, taking into account
1219 -- unconditional NOINLINE, etc. See TidyPgm.addExternal
1220 unfold_hsinfo | no_unfolding = Nothing
1221 | has_worker = Nothing -- Unfolding is implicit
1222 | otherwise = Just (HsUnfold (toIfaceExpr rhs))
1224 ------------ Inline prag --------------
1225 inline_prag = inlinePragInfo id_info
1226 inline_hsinfo | isAlwaysActive inline_prag = Nothing
1227 | no_unfolding && not has_worker = Nothing
1228 -- If the iface file give no unfolding info, we
1229 -- don't need to say when inlining is OK!
1230 | otherwise = Just (HsInline inline_prag)
1232 --------------------------
1233 coreRuleToIfaceRule :: CoreRule -> IfaceRule
1234 coreRuleToIfaceRule (BuiltinRule { ru_fn = fn})
1235 = pprTrace "toHsRule: builtin" (ppr fn) $
1238 coreRuleToIfaceRule (Rule { ru_name = name, ru_fn = fn,
1239 ru_act = act, ru_bndrs = bndrs,
1240 ru_args = args, ru_rhs = rhs, ru_orph = orph })
1241 = IfaceRule { ifRuleName = name, ifActivation = act,
1242 ifRuleBndrs = map toIfaceBndr bndrs,
1244 ifRuleArgs = map do_arg args,
1245 ifRuleRhs = toIfaceExpr rhs,
1248 -- For type args we must remove synonyms from the outermost
1249 -- level. Reason: so that when we read it back in we'll
1250 -- construct the same ru_rough field as we have right now;
1252 do_arg (Type ty) = IfaceType (toIfaceType (deNoteType ty))
1253 do_arg arg = toIfaceExpr arg
1255 bogusIfaceRule :: Name -> IfaceRule
1256 bogusIfaceRule id_name
1257 = IfaceRule { ifRuleName = FSLIT("bogus"), ifActivation = NeverActive,
1258 ifRuleBndrs = [], ifRuleHead = id_name, ifRuleArgs = [],
1259 ifRuleRhs = IfaceExt id_name, ifRuleOrph = Nothing }
1261 ---------------------
1262 toIfaceExpr :: CoreExpr -> IfaceExpr
1263 toIfaceExpr (Var v) = toIfaceVar v
1264 toIfaceExpr (Lit l) = IfaceLit l
1265 toIfaceExpr (Type ty) = IfaceType (toIfaceType ty)
1266 toIfaceExpr (Lam x b) = IfaceLam (toIfaceBndr x) (toIfaceExpr b)
1267 toIfaceExpr (App f a) = toIfaceApp f [a]
1268 toIfaceExpr (Case s x ty as) = IfaceCase (toIfaceExpr s) (getFS x) (toIfaceType ty) (map toIfaceAlt as)
1269 toIfaceExpr (Let b e) = IfaceLet (toIfaceBind b) (toIfaceExpr e)
1270 toIfaceExpr (Cast e co) = IfaceCast (toIfaceExpr e) (toIfaceType co)
1271 toIfaceExpr (Note n e) = IfaceNote (toIfaceNote n) (toIfaceExpr e)
1273 ---------------------
1274 toIfaceNote (SCC cc) = IfaceSCC cc
1275 toIfaceNote InlineMe = IfaceInlineMe
1276 toIfaceNote (CoreNote s) = IfaceCoreNote s
1278 ---------------------
1279 toIfaceBind (NonRec b r) = IfaceNonRec (toIfaceIdBndr b) (toIfaceExpr r)
1280 toIfaceBind (Rec prs) = IfaceRec [(toIfaceIdBndr b, toIfaceExpr r) | (b,r) <- prs]
1282 ---------------------
1283 toIfaceAlt (c,bs,r) = (toIfaceCon c, map getFS bs, toIfaceExpr r)
1285 ---------------------
1286 toIfaceCon (DataAlt dc) | isTupleTyCon tc = IfaceTupleAlt (tupleTyConBoxity tc)
1287 | otherwise = IfaceDataAlt (getName dc)
1289 tc = dataConTyCon dc
1291 toIfaceCon (LitAlt l) = IfaceLitAlt l
1292 toIfaceCon DEFAULT = IfaceDefault
1294 ---------------------
1295 toIfaceApp (App f a) as = toIfaceApp f (a:as)
1296 toIfaceApp (Var v) as
1297 = case isDataConWorkId_maybe v of
1298 -- We convert the *worker* for tuples into IfaceTuples
1299 Just dc | isTupleTyCon tc && saturated
1300 -> IfaceTuple (tupleTyConBoxity tc) tup_args
1302 val_args = dropWhile isTypeArg as
1303 saturated = val_args `lengthIs` idArity v
1304 tup_args = map toIfaceExpr val_args
1305 tc = dataConTyCon dc
1307 other -> mkIfaceApps (toIfaceVar v) as
1309 toIfaceApp e as = mkIfaceApps (toIfaceExpr e) as
1311 mkIfaceApps f as = foldl (\f a -> IfaceApp f (toIfaceExpr a)) f as
1313 ---------------------
1314 toIfaceVar :: Id -> IfaceExpr
1316 | Just fcall <- isFCallId_maybe v = IfaceFCall fcall (toIfaceType (idType v))
1317 -- Foreign calls have special syntax
1318 | isExternalName name = IfaceExt name
1319 | otherwise = IfaceLcl (getFS name)