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(..), 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(..) )
204 import HscTypes ( ModIface(..), ModDetails(..),
205 ModGuts(..), HscEnv(..), hscEPS, Dependencies(..),
207 ModSummary(..), msHiFilePath,
208 mkIfaceDepCache, mkIfaceFixCache, mkIfaceVerCache,
209 typeEnvElts, mkIfaceFamInstsCache,
210 GenAvailInfo(..), availName,
211 ExternalPackageState(..),
212 Usage(..), IsBootInterface,
213 Deprecs(..), IfaceDeprecs, Deprecations,
218 import DynFlags ( GhcMode(..), DynFlags(..), DynFlag(..), dopt )
219 import Name ( Name, nameModule, nameOccName, nameParent,
220 isExternalName, isInternalName, nameParent_maybe, isWiredInName,
221 isImplicitName, NamedThing(..) )
224 import OccName ( OccName, OccEnv, mkOccEnv, lookupOccEnv, emptyOccEnv,
226 OccSet, emptyOccSet, elemOccSet, occSetElts,
227 extendOccSet, extendOccSetList,
228 isEmptyOccSet, intersectOccSet, intersectsOccSet,
232 import BasicTypes ( Version, initialVersion, bumpVersion, isAlwaysActive,
233 Activation(..), RecFlag(..), boolToRecFlag )
235 import Util ( createDirectoryHierarchy, directoryOf, sortLe, seqList, lengthIs )
236 import BinIface ( writeBinIface )
237 import Unique ( Unique, Uniquable(..) )
238 import ErrUtils ( dumpIfSet_dyn, showPass )
239 import Digraph ( stronglyConnComp, SCC(..) )
240 import SrcLoc ( SrcSpan )
242 import PackageConfig ( PackageId )
246 import Monad ( when )
247 import List ( insert )
248 import Maybes ( orElse, mapCatMaybes, isNothing, isJust,
249 expectJust, catMaybes, MaybeErr(..) )
254 %************************************************************************
256 \subsection{Completing an interface}
258 %************************************************************************
262 -> Maybe ModIface -- The old interface, if we have it
263 -> ModGuts -- Usages, deprecations, etc
264 -> ModDetails -- The trimmed, tidied interface
265 -> IO (ModIface, -- The new one, complete with decls and versions
266 Bool) -- True <=> there was an old Iface, and the new one
267 -- is identical, so no need to write it
269 mkIface hsc_env maybe_old_iface
270 (ModGuts{ mg_module = this_mod,
274 mg_rdr_env = rdr_env,
275 mg_fix_env = fix_env,
276 mg_deprecs = src_deprecs })
277 (ModDetails{ md_insts = insts,
278 md_fam_insts= _fam_inst, -- we use the type_env instead
281 md_exports = exports })
283 -- NB: notice that mkIface does not look at the bindings
284 -- only at the TypeEnv. The previous Tidy phase has
285 -- put exactly the info into the TypeEnv that we want
286 -- to expose in the interface
288 = do { eps <- hscEPS hsc_env
289 ; let { ext_nm_rhs = mkExtNameFn hsc_env eps this_mod
290 ; ext_nm_lhs = mkLhsNameFn this_mod
292 ; decls = [ tyThingToIfaceDecl ext_nm_rhs thing
293 | thing <- typeEnvElts type_env,
294 let name = getName thing,
295 not (isImplicitName name || isWiredInName name) ]
296 -- Don't put implicit Ids and class tycons in the interface file
297 -- Nor wired-in things; the compiler knows about them anyhow
299 ; fixities = [ (occ,fix)
300 | FixItem occ fix _ <- nameEnvElts fix_env]
301 ; deprecs = mkIfaceDeprec src_deprecs
302 ; iface_rules = map (coreRuleToIfaceRule
303 ext_nm_lhs ext_nm_rhs) rules
304 ; iface_insts = map (instanceToIfaceInst ext_nm_lhs) insts
305 ; iface_fam_insts = extractIfFamInsts decls
307 ; intermediate_iface = ModIface {
308 mi_module = this_mod,
312 mi_exports = mkIfaceExports exports,
313 mi_insts = sortLe le_inst iface_insts,
314 mi_fam_insts= mkIfaceFamInstsCache decls,
315 mi_rules = sortLe le_rule iface_rules,
316 mi_fixities = fixities,
317 mi_deprecs = deprecs,
318 mi_globals = Just rdr_env,
320 -- Left out deliberately: filled in by addVersionInfo
321 mi_mod_vers = initialVersion,
322 mi_exp_vers = initialVersion,
323 mi_rule_vers = initialVersion,
324 mi_orphan = False, -- Always set by addVersionInfo, but
325 -- it's a strict field, so we can't omit it.
326 mi_decls = deliberatelyOmitted "decls",
327 mi_ver_fn = deliberatelyOmitted "ver_fn",
329 -- And build the cached values
330 mi_dep_fn = mkIfaceDepCache deprecs,
331 mi_fix_fn = mkIfaceFixCache fixities }
333 -- Add version information
334 ; (new_iface, no_change_at_all, pp_diffs, pp_orphs)
335 = _scc_ "versioninfo"
336 addVersionInfo maybe_old_iface intermediate_iface decls
340 ; when (isJust pp_orphs && dopt Opt_WarnOrphans dflags)
341 (printDump (expectJust "mkIface" pp_orphs))
342 ; when (dopt Opt_D_dump_hi_diffs dflags) (printDump pp_diffs)
343 ; dumpIfSet_dyn dflags Opt_D_dump_hi "FINAL INTERFACE"
344 (pprModIface new_iface)
346 ; return (new_iface, no_change_at_all) }
348 r1 `le_rule` r2 = ifRuleName r1 <= ifRuleName r2
349 i1 `le_inst` i2 = ifDFun i1 <= ifDFun i2
351 dflags = hsc_dflags hsc_env
352 deliberatelyOmitted x = panic ("Deliberately omitted: " ++ x)
355 -----------------------------
356 writeIfaceFile :: ModLocation -> ModIface -> IO ()
357 writeIfaceFile location new_iface
358 = do createDirectoryHierarchy (directoryOf hi_file_path)
359 writeBinIface hi_file_path new_iface
360 where hi_file_path = ml_hi_file location
363 -----------------------------
364 mkExtNameFn :: HscEnv -> ExternalPackageState -> Module -> Name -> IfaceExtName
365 mkExtNameFn hsc_env eps this_mod
368 hpt = hsc_HPT hsc_env
372 | mod == this_mod = case nameParent_maybe name of
373 Nothing -> LocalTop occ
374 Just par -> LocalTopSub occ (nameOccName par)
375 | isWiredInName name = ExtPkg mod occ
376 | is_home mod = HomePkg mod_name occ vers
377 | otherwise = ExtPkg mod occ
379 dflags = hsc_dflags hsc_env
380 this_pkg = thisPackage dflags
381 is_home mod = modulePackageId mod == this_pkg
383 mod = nameModule name
384 mod_name = moduleName mod
385 occ = nameOccName name
386 par_occ = nameOccName (nameParent name)
387 -- The version of the *parent* is the one want
388 vers = lookupVersion mod par_occ occ
390 lookupVersion :: Module -> OccName -> OccName -> Version
391 -- Even though we're looking up a home-package thing, in
392 -- one-shot mode the imported interfaces may be in the PIT
393 lookupVersion mod par_occ occ
394 = mi_ver_fn iface par_occ `orElse`
395 pprPanic "lookupVers1" (ppr mod <+> ppr par_occ <+> ppr occ)
397 iface = lookupIfaceByModule (hsc_dflags hsc_env) hpt pit mod `orElse`
398 pprPanic "lookupVers2" (ppr mod <+> ppr par_occ <+> ppr occ)
401 ---------------------
402 -- mkLhsNameFn ignores versioning info altogether
403 -- It is used for the LHS of instance decls and rules, where we
404 -- there's no point in recording version info
405 mkLhsNameFn :: Module -> Name -> IfaceExtName
406 mkLhsNameFn this_mod name
407 | isInternalName name = pprTrace "mkLhsNameFn: unexpected internal" (ppr name) $
408 LocalTop occ -- Should not happen
409 | mod == this_mod = LocalTop occ
410 | otherwise = ExtPkg mod occ
412 mod = nameModule name
413 occ = nameOccName name
416 -----------------------------
417 -- Compute version numbers for local decls
419 addVersionInfo :: Maybe ModIface -- The old interface, read from M.hi
420 -> ModIface -- The new interface decls (lacking decls)
421 -> [IfaceDecl] -- The new decls
423 Bool, -- True <=> no changes at all; no need to write new Iface
425 Maybe SDoc) -- Warnings about orphans
427 addVersionInfo Nothing new_iface new_decls
428 -- No old interface, so definitely write a new one!
429 = (new_iface { mi_orphan = anyNothing ifInstOrph (mi_insts new_iface)
430 || anyNothing ifRuleOrph (mi_rules new_iface),
431 mi_decls = [(initialVersion, decl) | decl <- new_decls],
432 mi_ver_fn = \n -> Just initialVersion },
434 ptext SLIT("No old interface file"),
435 pprOrphans orph_insts orph_rules)
437 orph_insts = filter (isNothing . ifInstOrph) (mi_insts new_iface)
438 orph_rules = filter (isNothing . ifRuleOrph) (mi_rules new_iface)
440 addVersionInfo (Just old_iface@(ModIface { mi_mod_vers = old_mod_vers,
441 mi_exp_vers = old_exp_vers,
442 mi_rule_vers = old_rule_vers,
443 mi_decls = old_decls,
444 mi_ver_fn = old_decl_vers,
445 mi_fix_fn = old_fixities }))
446 new_iface@(ModIface { mi_fix_fn = new_fixities })
449 | no_change_at_all = (old_iface, True, ptext SLIT("Interface file unchanged"), pp_orphs)
450 | otherwise = (final_iface, False, vcat [ptext SLIT("Interface file has changed"),
451 nest 2 pp_diffs], pp_orphs)
453 final_iface = new_iface { mi_mod_vers = bump_unless no_output_change old_mod_vers,
454 mi_exp_vers = bump_unless no_export_change old_exp_vers,
455 mi_rule_vers = bump_unless no_rule_change old_rule_vers,
456 mi_orphan = not (null new_orph_rules && null new_orph_insts),
457 mi_decls = decls_w_vers,
458 mi_ver_fn = mkIfaceVerCache decls_w_vers }
460 decls_w_vers = [(add_vers decl, decl) | decl <- new_decls]
463 (old_non_orph_insts, old_orph_insts) = mkOrphMap ifInstOrph (mi_insts old_iface)
464 (new_non_orph_insts, new_orph_insts) = mkOrphMap ifInstOrph (mi_insts new_iface)
465 same_insts occ = eqMaybeBy (eqListBy eqIfInst)
466 (lookupOccEnv old_non_orph_insts occ)
467 (lookupOccEnv new_non_orph_insts occ)
469 (old_non_orph_rules, old_orph_rules) = mkOrphMap ifRuleOrph (mi_rules old_iface)
470 (new_non_orph_rules, new_orph_rules) = mkOrphMap ifRuleOrph (mi_rules new_iface)
471 same_rules occ = eqMaybeBy (eqListBy eqIfRule)
472 (lookupOccEnv old_non_orph_rules occ)
473 (lookupOccEnv new_non_orph_rules occ)
475 -- Computing what changed
476 no_output_change = no_decl_change && no_rule_change &&
477 no_export_change && no_deprec_change
478 no_export_change = mi_exports new_iface == mi_exports old_iface -- Kept sorted
479 no_decl_change = isEmptyOccSet changed_occs
480 no_rule_change = not (changedWrt changed_occs (eqListBy eqIfRule old_orph_rules new_orph_rules)
481 || changedWrt changed_occs (eqListBy eqIfInst old_orph_insts new_orph_insts))
482 no_deprec_change = mi_deprecs new_iface == mi_deprecs old_iface
484 -- If the usages havn't changed either, we don't need to write the interface file
485 no_other_changes = mi_usages new_iface == mi_usages old_iface &&
486 mi_deps new_iface == mi_deps old_iface
487 no_change_at_all = no_output_change && no_other_changes
489 pp_diffs = vcat [pp_change no_export_change "Export list"
490 (ppr old_exp_vers <+> arrow <+> ppr (mi_exp_vers final_iface)),
491 pp_change no_rule_change "Rules"
492 (ppr old_rule_vers <+> arrow <+> ppr (mi_rule_vers final_iface)),
493 pp_change no_deprec_change "Deprecations" empty,
494 pp_change no_other_changes "Usages" empty,
496 pp_change True what info = empty
497 pp_change False what info = text what <+> ptext SLIT("changed") <+> info
500 old_decl_env = mkOccEnv [(ifName decl, decl) | (_,decl) <- old_decls]
501 same_fixity n = bool (old_fixities n == new_fixities n)
504 -- Adding version info
505 new_version = bumpVersion old_mod_vers -- Start from the old module version, not from zero
506 -- so that if you remove f, and then add it again,
507 -- you don't thereby reduce f's version number
508 add_vers decl | occ `elemOccSet` changed_occs = new_version
509 | otherwise = expectJust "add_vers" (old_decl_vers occ)
510 -- If it's unchanged, there jolly well
511 where -- should be an old version number
515 changed_occs :: OccSet
516 changed_occs = computeChangedOccs eq_info
518 eq_info :: [(OccName, IfaceEq)]
519 eq_info = map check_eq new_decls
520 check_eq new_decl | Just old_decl <- lookupOccEnv old_decl_env occ
521 = (occ, new_decl `eqIfDecl` old_decl &&&
522 eq_indirects new_decl)
523 | otherwise {- No corresponding old decl -}
526 occ = ifName new_decl
528 eq_indirects :: IfaceDecl -> IfaceEq
529 -- When seeing if two decls are the same, remember to
530 -- check whether any relevant fixity or rules have changed
531 eq_indirects (IfaceId {ifName = occ}) = eq_ind_occ occ
532 eq_indirects (IfaceClass {ifName = cls_occ, ifSigs = sigs})
533 = same_insts cls_occ &&&
534 eq_ind_occs [op | IfaceClassOp op _ _ <- sigs]
535 eq_indirects (IfaceData {ifName = tc_occ, ifCons = cons})
536 = same_insts tc_occ &&& same_fixity tc_occ &&& -- The TyCon can have a fixity too
537 eq_ind_occs (map ifConOcc (visibleIfConDecls cons))
538 eq_indirects other = Equal -- Synonyms and foreign declarations
540 eq_ind_occ :: OccName -> IfaceEq -- For class ops and Ids; check fixity and rules
541 eq_ind_occ occ = same_fixity occ &&& same_rules occ
542 eq_ind_occs = foldr ((&&&) . eq_ind_occ) Equal
546 pp_decl_diffs :: SDoc -- Nothing => no changes
548 | isEmptyOccSet changed_occs = empty
550 = vcat [ptext SLIT("Changed occs:") <+> ppr (occSetElts changed_occs),
551 ptext SLIT("Version change for these decls:"),
552 nest 2 (vcat (map show_change new_decls))]
554 eq_env = mkOccEnv eq_info
556 | not (occ `elemOccSet` changed_occs) = empty
558 = vcat [ppr occ <+> ppr (old_decl_vers occ) <+> arrow <+> ppr new_version,
561 occ = ifName new_decl
562 why = case lookupOccEnv eq_env occ of
563 Just (EqBut occs) -> sep [ppr occ <> colon, ptext SLIT("Free vars (only) changed:"),
564 nest 2 (braces (fsep (map ppr (occSetElts
565 (occs `intersectOccSet` changed_occs)))))]
567 | Just old_decl <- lookupOccEnv old_decl_env occ
568 -> vcat [ptext SLIT("Old:") <+> ppr old_decl,
569 ptext SLIT("New:") <+> ppr new_decl]
571 -> ppr occ <+> ptext SLIT("only in new interface")
572 other -> pprPanic "MkIface.show_change" (ppr occ)
574 pp_orphs = pprOrphans new_orph_insts new_orph_rules
576 pprOrphans insts rules
577 | null insts && null rules = Nothing
580 if null insts then empty else
581 hang (ptext SLIT("Warning: orphan instances:"))
582 2 (vcat (map ppr insts)),
583 if null rules then empty else
584 hang (ptext SLIT("Warning: orphan rules:"))
585 2 (vcat (map ppr rules))
588 computeChangedOccs :: [(OccName, IfaceEq)] -> OccSet
589 computeChangedOccs eq_info
590 = foldl add_changes emptyOccSet (stronglyConnComp edges)
592 edges :: [((OccName,IfaceEq), Unique, [Unique])]
593 edges = [ (node, getUnique occ, map getUnique occs)
594 | node@(occ, iface_eq) <- eq_info
595 , let occs = case iface_eq of
596 EqBut occ_set -> occSetElts occ_set
599 -- Changes in declarations
600 add_changes :: OccSet -> SCC (OccName, IfaceEq) -> OccSet
601 add_changes so_far (AcyclicSCC (occ, iface_eq))
602 | changedWrt so_far iface_eq -- This one has changed
603 = extendOccSet so_far occ
604 add_changes so_far (CyclicSCC pairs)
605 | changedWrt so_far (foldr1 (&&&) (map snd pairs)) -- One of this group has changed
606 = extendOccSetList so_far (map fst pairs)
607 add_changes so_far other = so_far
609 changedWrt :: OccSet -> IfaceEq -> Bool
610 changedWrt so_far Equal = False
611 changedWrt so_far NotEqual = True
612 changedWrt so_far (EqBut kids) = so_far `intersectsOccSet` kids
614 ----------------------
615 -- mkOrphMap partitions instance decls or rules into
616 -- (a) an OccEnv for ones that are not orphans,
617 -- mapping the local OccName to a list of its decls
618 -- (b) a list of orphan decls
619 mkOrphMap :: (decl -> Maybe OccName) -- (Just occ) for a non-orphan decl, keyed by occ
620 -- Nothing for an orphan decl
621 -> [decl] -- Sorted into canonical order
622 -> (OccEnv [decl], -- Non-orphan decls associated with their key;
623 -- each sublist in canonical order
624 [decl]) -- Orphan decls; in canonical order
625 mkOrphMap get_key decls
626 = foldl go (emptyOccEnv, []) decls
628 go (non_orphs, orphs) d
629 | Just occ <- get_key d
630 = (extendOccEnv_C (\ ds _ -> d:ds) non_orphs occ [d], orphs)
631 | otherwise = (non_orphs, d:orphs)
633 anyNothing :: (a -> Maybe b) -> [a] -> Bool
634 anyNothing p [] = False
635 anyNothing p (x:xs) = isNothing (p x) || anyNothing p xs
637 ----------------------
638 mkIfaceDeprec :: Deprecations -> IfaceDeprecs
639 mkIfaceDeprec NoDeprecs = NoDeprecs
640 mkIfaceDeprec (DeprecAll t) = DeprecAll t
641 mkIfaceDeprec (DeprecSome env) = DeprecSome (sortLe (<=) (nameEnvElts env))
643 ----------------------
644 bump_unless :: Bool -> Version -> Version
645 bump_unless True v = v -- True <=> no change
646 bump_unless False v = bumpVersion v
650 %*********************************************************
652 \subsection{Keeping track of what we've slurped, and version numbers}
654 %*********************************************************
658 mkUsageInfo :: HscEnv
659 -> ModuleEnv (Module, Bool, SrcSpan)
660 -> [(ModuleName, IsBootInterface)]
661 -> NameSet -> IO [Usage]
662 mkUsageInfo hsc_env dir_imp_mods dep_mods used_names
663 = do { eps <- hscEPS hsc_env
664 ; let usages = mk_usage_info (eps_PIT eps) hsc_env
665 dir_imp_mods dep_mods used_names
666 ; usages `seqList` return usages }
667 -- seq the list of Usages returned: occasionally these
668 -- don't get evaluated for a while and we can end up hanging on to
669 -- the entire collection of Ifaces.
671 mk_usage_info pit hsc_env dir_imp_mods dep_mods proto_used_names
672 = mapCatMaybes mkUsage dep_mods
673 -- ToDo: do we need to sort into canonical order?
675 hpt = hsc_HPT hsc_env
676 dflags = hsc_dflags hsc_env
678 used_names = mkNameSet $ -- Eliminate duplicates
679 [ nameParent n -- Just record usage on the 'main' names
680 | n <- nameSetToList proto_used_names
681 , not (isWiredInName n) -- Don't record usages for wired-in names
682 , isExternalName n -- Ignore internal names
685 -- ent_map groups together all the things imported and used
686 -- from a particular module in this package
687 ent_map :: ModuleEnv [OccName]
688 ent_map = foldNameSet add_mv emptyModuleEnv used_names
689 add_mv name mv_map = extendModuleEnv_C add_item mv_map mod [occ]
691 occ = nameOccName name
692 mod = nameModule name
693 add_item occs _ = occ:occs
695 depend_on_exports mod = case lookupModuleEnv dir_imp_mods mod of
696 Just (_,no_imp,_) -> not no_imp
699 -- We want to create a Usage for a home module if
700 -- a) we used something from; has something in used_names
701 -- b) we imported all of it, even if we used nothing from it
702 -- (need to recompile if its export list changes: export_vers)
703 -- c) is a home-package orphan module (need to recompile if its
704 -- instance decls change: rules_vers)
705 mkUsage :: (ModuleName, IsBootInterface) -> Maybe Usage
706 mkUsage (mod_name, _)
707 | isNothing maybe_iface -- We can't depend on it if we didn't
708 || (null used_occs -- load its interface.
709 && isNothing export_vers
711 = Nothing -- Record no usage info
714 = Just (Usage { usg_name = mod_name,
716 usg_exports = export_vers,
717 usg_entities = ent_vers,
718 usg_rules = rules_vers })
720 maybe_iface = lookupIfaceByModule dflags hpt pit mod
721 -- In one-shot mode, the interfaces for home-package
722 -- modules accumulate in the PIT not HPT. Sigh.
724 mod = mkModule (thisPackage dflags) mod_name
726 Just iface = maybe_iface
727 orphan_mod = mi_orphan iface
728 version_env = mi_ver_fn iface
729 mod_vers = mi_mod_vers iface
730 rules_vers = mi_rule_vers iface
731 export_vers | depend_on_exports mod = Just (mi_exp_vers iface)
732 | otherwise = Nothing
734 -- The sort is to put them into canonical order
735 used_occs = lookupModuleEnv ent_map mod `orElse` []
736 ent_vers :: [(OccName,Version)]
737 ent_vers = [ (occ, version_env occ `orElse` initialVersion)
738 | occ <- sortLe (<=) used_occs]
742 mkIfaceExports :: NameSet -> [(Module, [GenAvailInfo OccName])]
743 -- Group by module and sort by occurrence
744 -- This keeps the list in canonical order
745 mkIfaceExports exports
746 = [ (mod, eltsUFM avails)
747 | (mod, avails) <- fmToList groupFM
750 groupFM :: ModuleEnv (UniqFM (GenAvailInfo OccName))
751 -- Deliberately use the FastString so we
752 -- get a canonical ordering
753 groupFM = foldl add emptyModuleEnv (nameSetToList exports)
755 add env name = extendModuleEnv_C add_avail env mod
756 (unitUFM avail_fs avail)
758 occ = nameOccName name
759 mod = nameModule name
760 avail | Just p <- nameParent_maybe name = AvailTC (nameOccName p) [occ]
761 | isTcOcc occ = AvailTC occ [occ]
762 | otherwise = Avail occ
763 avail_fs = occNameFS (availName avail)
764 add_avail avail_fm _ = addToUFM_C add_item avail_fm avail_fs avail
766 add_item (AvailTC p occs) _ = AvailTC p (List.insert occ occs)
767 add_item (Avail n) _ = pprPanic "MkIface.addAvail" (ppr n <+> ppr name)
771 %************************************************************************
773 Load the old interface file for this module (unless
774 we have it aleady), and check whether it is up to date
777 %************************************************************************
780 checkOldIface :: HscEnv
782 -> Bool -- Source unchanged
783 -> Maybe ModIface -- Old interface from compilation manager, if any
784 -> IO (RecompileRequired, Maybe ModIface)
786 checkOldIface hsc_env mod_summary source_unchanged maybe_iface
787 = do { showPass (hsc_dflags hsc_env)
788 ("Checking old interface for " ++
789 showSDoc (ppr (ms_mod mod_summary))) ;
791 ; initIfaceCheck hsc_env $
792 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
795 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
796 = -- CHECK WHETHER THE SOURCE HAS CHANGED
797 ifM (not source_unchanged)
798 (traceHiDiffs (nest 4 (text "Source file changed or recompilation check turned off")))
801 -- If the source has changed and we're in interactive mode, avoid reading
802 -- an interface; just return the one we might have been supplied with.
803 getGhcMode `thenM` \ ghc_mode ->
804 if (ghc_mode == Interactive || ghc_mode == JustTypecheck)
805 && not source_unchanged then
806 returnM (outOfDate, maybe_iface)
809 case maybe_iface of {
810 Just old_iface -> do -- Use the one we already have
811 recomp <- checkVersions hsc_env source_unchanged old_iface
812 return (recomp, Just old_iface)
816 -- Try and read the old interface for the current module
817 -- from the .hi file left from the last time we compiled it
819 iface_path = msHiFilePath mod_summary
821 readIface (ms_mod mod_summary) iface_path False `thenM` \ read_result ->
822 case read_result of {
823 Failed err -> -- Old interface file not found, or garbled; give up
824 traceIf (text "FYI: cannot read old interface file:"
825 $$ nest 4 err) `thenM_`
826 returnM (outOfDate, Nothing)
830 -- We have got the old iface; check its versions
831 checkVersions hsc_env source_unchanged iface `thenM` \ recomp ->
832 returnM (recomp, Just iface)
836 @recompileRequired@ is called from the HscMain. It checks whether
837 a recompilation is required. It needs access to the persistent state,
838 finder, etc, because it may have to load lots of interface files to
839 check their versions.
842 type RecompileRequired = Bool
843 upToDate = False -- Recompile not required
844 outOfDate = True -- Recompile required
846 checkVersions :: HscEnv
847 -> Bool -- True <=> source unchanged
848 -> ModIface -- Old interface
849 -> IfG RecompileRequired
850 checkVersions hsc_env source_unchanged iface
851 | not source_unchanged
854 = do { traceHiDiffs (text "Considering whether compilation is required for" <+>
855 ppr (mi_module iface) <> colon)
857 -- Source code unchanged and no errors yet... carry on
859 -- First put the dependent-module info, read from the old interface, into the envt,
860 -- so that when we look for interfaces we look for the right one (.hi or .hi-boot)
862 -- It's just temporary because either the usage check will succeed
863 -- (in which case we are done with this module) or it'll fail (in which
864 -- case we'll compile the module from scratch anyhow).
866 -- We do this regardless of compilation mode
867 ; updateEps_ $ \eps -> eps { eps_is_boot = mod_deps }
869 ; let this_pkg = thisPackage (hsc_dflags hsc_env)
870 ; checkList [checkModUsage this_pkg u | u <- mi_usages iface]
873 -- This is a bit of a hack really
874 mod_deps :: ModuleNameEnv (ModuleName, IsBootInterface)
875 mod_deps = mkModDeps (dep_mods (mi_deps iface))
877 checkModUsage :: PackageId ->Usage -> IfG RecompileRequired
878 -- Given the usage information extracted from the old
879 -- M.hi file for the module being compiled, figure out
880 -- whether M needs to be recompiled.
882 checkModUsage this_pkg (Usage { usg_name = mod_name, usg_mod = old_mod_vers,
883 usg_rules = old_rule_vers,
884 usg_exports = maybe_old_export_vers,
885 usg_entities = old_decl_vers })
886 = -- Load the imported interface is possible
888 doc_str = sep [ptext SLIT("need version info for"), ppr mod_name]
890 traceHiDiffs (text "Checking usages for module" <+> ppr mod_name) `thenM_`
893 mod = mkModule this_pkg mod_name
895 loadInterface doc_str mod ImportBySystem `thenM` \ mb_iface ->
896 -- Load the interface, but don't complain on failure;
897 -- Instead, get an Either back which we can test
900 Failed exn -> (out_of_date (sep [ptext SLIT("Can't find version number for module"),
902 -- Couldn't find or parse a module mentioned in the
903 -- old interface file. Don't complain -- it might just be that
904 -- the current module doesn't need that import and it's been deleted
908 new_mod_vers = mi_mod_vers iface
909 new_decl_vers = mi_ver_fn iface
910 new_export_vers = mi_exp_vers iface
911 new_rule_vers = mi_rule_vers iface
914 checkModuleVersion old_mod_vers new_mod_vers `thenM` \ recompile ->
915 if not recompile then
920 if checkExportList maybe_old_export_vers new_export_vers then
921 out_of_date_vers (ptext SLIT(" Export list changed"))
922 (expectJust "checkModUsage" maybe_old_export_vers)
927 if old_rule_vers /= new_rule_vers then
928 out_of_date_vers (ptext SLIT(" Rules changed"))
929 old_rule_vers new_rule_vers
932 -- CHECK ITEMS ONE BY ONE
933 checkList [checkEntityUsage new_decl_vers u | u <- old_decl_vers] `thenM` \ recompile ->
935 returnM outOfDate -- This one failed, so just bail out now
937 up_to_date (ptext SLIT(" Great! The bits I use are up to date"))
940 ------------------------
941 checkModuleVersion old_mod_vers new_mod_vers
942 | new_mod_vers == old_mod_vers
943 = up_to_date (ptext SLIT("Module version unchanged"))
946 = out_of_date_vers (ptext SLIT(" Module version has changed"))
947 old_mod_vers new_mod_vers
949 ------------------------
950 checkExportList Nothing new_vers = upToDate
951 checkExportList (Just v) new_vers = v /= new_vers
953 ------------------------
954 checkEntityUsage new_vers (name,old_vers)
955 = case new_vers name of
957 Nothing -> -- We used it before, but it ain't there now
958 out_of_date (sep [ptext SLIT("No longer exported:"), ppr name])
960 Just new_vers -- It's there, but is it up to date?
961 | new_vers == old_vers -> traceHiDiffs (text " Up to date" <+> ppr name <+> parens (ppr new_vers)) `thenM_`
963 | otherwise -> out_of_date_vers (ptext SLIT(" Out of date:") <+> ppr name)
966 up_to_date msg = traceHiDiffs msg `thenM_` returnM upToDate
967 out_of_date msg = traceHiDiffs msg `thenM_` returnM outOfDate
968 out_of_date_vers msg old_vers new_vers
969 = out_of_date (hsep [msg, ppr old_vers, ptext SLIT("->"), ppr new_vers])
971 ----------------------
972 checkList :: [IfG RecompileRequired] -> IfG RecompileRequired
973 -- This helper is used in two places
974 checkList [] = returnM upToDate
975 checkList (check:checks) = check `thenM` \ recompile ->
982 %************************************************************************
984 Converting things to their Iface equivalents
986 %************************************************************************
989 tyThingToIfaceDecl :: (Name -> IfaceExtName) -> TyThing -> IfaceDecl
990 -- Assumption: the thing is already tidied, so that locally-bound names
991 -- (lambdas, for-alls) already have non-clashing OccNames
992 -- Reason: Iface stuff uses OccNames, and the conversion here does
993 -- not do tidying on the way
994 tyThingToIfaceDecl ext (AnId id)
995 = IfaceId { ifName = getOccName id,
996 ifType = toIfaceType ext (idType id),
999 info = case toIfaceIdInfo ext (idInfo id) of
1001 items -> HasInfo items
1003 tyThingToIfaceDecl ext (AClass clas)
1004 = IfaceClass { ifCtxt = toIfaceContext ext sc_theta,
1005 ifName = getOccName clas,
1006 ifTyVars = toIfaceTvBndrs clas_tyvars,
1007 ifFDs = map toIfaceFD clas_fds,
1008 ifATs = map (tyThingToIfaceDecl ext . ATyCon) clas_ats,
1009 ifSigs = map toIfaceClassOp op_stuff,
1010 ifRec = boolToRecFlag (isRecursiveTyCon tycon) }
1012 (clas_tyvars, clas_fds, sc_theta, _, clas_ats, op_stuff)
1013 = classExtraBigSig clas
1014 tycon = classTyCon clas
1016 toIfaceClassOp (sel_id, def_meth)
1017 = ASSERT(sel_tyvars == clas_tyvars)
1018 IfaceClassOp (getOccName sel_id) def_meth (toIfaceType ext op_ty)
1020 -- Be careful when splitting the type, because of things
1021 -- like class Foo a where
1022 -- op :: (?x :: String) => a -> a
1023 -- and class Baz a where
1024 -- op :: (Ord a) => a -> a
1025 (sel_tyvars, rho_ty) = splitForAllTys (idType sel_id)
1026 op_ty = funResultTy rho_ty
1028 toIfaceFD (tvs1, tvs2) = (map (occNameFS.getOccName) tvs1, map (occNameFS.getOccName) tvs2)
1030 tyThingToIfaceDecl ext (ATyCon tycon)
1032 = IfaceSyn { ifName = getOccName tycon,
1033 ifTyVars = toIfaceTvBndrs tyvars,
1034 ifOpenSyn = syn_isOpen,
1035 ifSynRhs = toIfaceType ext syn_tyki }
1038 = IfaceData { ifName = getOccName tycon,
1039 ifTyVars = toIfaceTvBndrs tyvars,
1040 ifCtxt = toIfaceContext ext (tyConStupidTheta tycon),
1041 ifCons = ifaceConDecls (algTyConRhs tycon),
1042 ifRec = boolToRecFlag (isRecursiveTyCon tycon),
1043 ifGadtSyntax = isGadtSyntaxTyCon tycon,
1044 ifGeneric = tyConHasGenerics tycon,
1045 ifFamInst = famInstToIface (tyConFamInst_maybe tycon)}
1047 | isForeignTyCon tycon
1048 = IfaceForeign { ifName = getOccName tycon,
1049 ifExtName = tyConExtName tycon }
1051 | isPrimTyCon tycon || isFunTyCon tycon
1052 -- Needed in GHCi for ':info Int#', for example
1053 = IfaceData { ifName = getOccName tycon,
1054 ifTyVars = toIfaceTvBndrs (take (tyConArity tycon) alphaTyVars),
1056 ifCons = IfAbstractTyCon,
1057 ifGadtSyntax = False,
1059 ifRec = NonRecursive,
1060 ifFamInst = Nothing }
1062 | otherwise = pprPanic "toIfaceDecl" (ppr tycon)
1064 tyvars = tyConTyVars tycon
1065 (syn_isOpen, syn_tyki) = case synTyConRhs tycon of
1066 OpenSynTyCon ki -> (True , ki)
1067 SynonymTyCon ty -> (False, ty)
1069 ifaceConDecls (NewTyCon { data_con = con }) =
1070 IfNewTyCon (ifaceConDecl con)
1071 ifaceConDecls (DataTyCon { data_cons = cons }) =
1072 IfDataTyCon (map ifaceConDecl cons)
1073 ifaceConDecls OpenDataTyCon = IfOpenDataTyCon
1074 ifaceConDecls OpenNewTyCon = IfOpenNewTyCon
1075 ifaceConDecls AbstractTyCon = IfAbstractTyCon
1076 -- The last case happens when a TyCon has been trimmed during tidying
1077 -- Furthermore, tyThingToIfaceDecl is also used
1078 -- in TcRnDriver for GHCi, when browsing a module, in which case the
1079 -- AbstractTyCon case is perfectly sensible.
1081 ifaceConDecl data_con
1082 = IfCon { ifConOcc = getOccName (dataConName data_con),
1083 ifConInfix = dataConIsInfix data_con,
1084 ifConUnivTvs = toIfaceTvBndrs (dataConUnivTyVars data_con),
1085 ifConExTvs = toIfaceTvBndrs (dataConExTyVars data_con),
1086 ifConEqSpec = to_eq_spec (dataConEqSpec data_con),
1087 ifConCtxt = toIfaceContext ext (dataConTheta data_con),
1088 ifConArgTys = map (toIfaceType ext)
1089 (dataConOrigArgTys data_con),
1090 ifConFields = map getOccName
1091 (dataConFieldLabels data_con),
1092 ifConStricts = dataConStrictMarks data_con }
1094 to_eq_spec spec = [(getOccName tv, toIfaceType ext ty) | (tv,ty) <- spec]
1096 famInstToIface Nothing = Nothing
1097 famInstToIface (Just (famTyCon, instTys)) =
1098 Just $ IfaceFamInst { ifFamInstTyCon = toIfaceTyCon ext famTyCon
1099 , ifFamInstTys = map (toIfaceType ext) instTys
1102 tyThingToIfaceDecl ext (ADataCon dc)
1103 = pprPanic "toIfaceDecl" (ppr dc) -- Should be trimmed out earlier
1106 --------------------------
1107 instanceToIfaceInst :: (Name -> IfaceExtName) -> Instance -> IfaceInst
1108 instanceToIfaceInst ext_lhs ispec@(Instance { is_dfun = dfun_id, is_flag = oflag,
1109 is_cls = cls, is_tcs = mb_tcs,
1111 = IfaceInst { ifDFun = getOccName dfun_id,
1113 ifInstCls = ext_lhs cls,
1114 ifInstTys = map do_rough mb_tcs,
1117 do_rough Nothing = Nothing
1118 do_rough (Just n) = Just (toIfaceTyCon_name ext_lhs n)
1120 --------------------------
1121 toIfaceIdInfo :: (Name -> IfaceExtName) -> IdInfo -> [IfaceInfoItem]
1122 toIfaceIdInfo ext id_info
1123 = catMaybes [arity_hsinfo, caf_hsinfo, strict_hsinfo,
1124 inline_hsinfo, wrkr_hsinfo, unfold_hsinfo]
1126 ------------ Arity --------------
1127 arity_info = arityInfo id_info
1128 arity_hsinfo | arity_info == 0 = Nothing
1129 | otherwise = Just (HsArity arity_info)
1131 ------------ Caf Info --------------
1132 caf_info = cafInfo id_info
1133 caf_hsinfo = case caf_info of
1134 NoCafRefs -> Just HsNoCafRefs
1137 ------------ Strictness --------------
1138 -- No point in explicitly exporting TopSig
1139 strict_hsinfo = case newStrictnessInfo id_info of
1140 Just sig | not (isTopSig sig) -> Just (HsStrictness sig)
1143 ------------ Worker --------------
1144 work_info = workerInfo id_info
1145 has_worker = case work_info of { HasWorker _ _ -> True; other -> False }
1146 wrkr_hsinfo = case work_info of
1147 HasWorker work_id wrap_arity ->
1148 Just (HsWorker (ext (idName work_id)) wrap_arity)
1151 ------------ Unfolding --------------
1152 -- The unfolding is redundant if there is a worker
1153 unfold_info = unfoldingInfo id_info
1154 rhs = unfoldingTemplate unfold_info
1155 no_unfolding = neverUnfold unfold_info
1156 -- The CoreTidy phase retains unfolding info iff
1157 -- we want to expose the unfolding, taking into account
1158 -- unconditional NOINLINE, etc. See TidyPgm.addExternal
1159 unfold_hsinfo | no_unfolding = Nothing
1160 | has_worker = Nothing -- Unfolding is implicit
1161 | otherwise = Just (HsUnfold (toIfaceExpr ext rhs))
1163 ------------ Inline prag --------------
1164 inline_prag = inlinePragInfo id_info
1165 inline_hsinfo | isAlwaysActive inline_prag = Nothing
1166 | no_unfolding && not has_worker = Nothing
1167 -- If the iface file give no unfolding info, we
1168 -- don't need to say when inlining is OK!
1169 | otherwise = Just (HsInline inline_prag)
1171 --------------------------
1172 coreRuleToIfaceRule :: (Name -> IfaceExtName) -- For the LHS names
1173 -> (Name -> IfaceExtName) -- For the RHS names
1174 -> CoreRule -> IfaceRule
1175 coreRuleToIfaceRule ext_lhs ext_rhs (BuiltinRule { ru_fn = fn})
1176 = pprTrace "toHsRule: builtin" (ppr fn) $
1177 bogusIfaceRule (mkIfaceExtName fn)
1179 coreRuleToIfaceRule ext_lhs ext_rhs
1180 (Rule { ru_name = name, ru_fn = fn, ru_act = act, ru_bndrs = bndrs,
1181 ru_args = args, ru_rhs = rhs, ru_orph = orph })
1182 = IfaceRule { ifRuleName = name, ifActivation = act,
1183 ifRuleBndrs = map (toIfaceBndr ext_lhs) bndrs,
1184 ifRuleHead = ext_lhs fn,
1185 ifRuleArgs = map do_arg args,
1186 ifRuleRhs = toIfaceExpr ext_rhs rhs,
1189 -- For type args we must remove synonyms from the outermost
1190 -- level. Reason: so that when we read it back in we'll
1191 -- construct the same ru_rough field as we have right now;
1193 do_arg (Type ty) = IfaceType (toIfaceType ext_lhs (deNoteType ty))
1194 do_arg arg = toIfaceExpr ext_lhs arg
1196 bogusIfaceRule :: IfaceExtName -> IfaceRule
1197 bogusIfaceRule id_name
1198 = IfaceRule { ifRuleName = FSLIT("bogus"), ifActivation = NeverActive,
1199 ifRuleBndrs = [], ifRuleHead = id_name, ifRuleArgs = [],
1200 ifRuleRhs = IfaceExt id_name, ifRuleOrph = Nothing }
1202 ---------------------
1203 toIfaceExpr :: (Name -> IfaceExtName) -> CoreExpr -> IfaceExpr
1204 toIfaceExpr ext (Var v) = toIfaceVar ext v
1205 toIfaceExpr ext (Lit l) = IfaceLit l
1206 toIfaceExpr ext (Type ty) = IfaceType (toIfaceType ext ty)
1207 toIfaceExpr ext (Lam x b) = IfaceLam (toIfaceBndr ext x) (toIfaceExpr ext b)
1208 toIfaceExpr ext (App f a) = toIfaceApp ext f [a]
1209 toIfaceExpr ext (Case s x ty as) = IfaceCase (toIfaceExpr ext s) (occNameFS (getOccName x)) (toIfaceType ext ty) (map (toIfaceAlt ext) as)
1210 toIfaceExpr ext (Let b e) = IfaceLet (toIfaceBind ext b) (toIfaceExpr ext e)
1211 toIfaceExpr ext (Cast e co) = IfaceCast (toIfaceExpr ext e) (toIfaceType ext co)
1212 toIfaceExpr ext (Note n e) = IfaceNote (toIfaceNote ext n) (toIfaceExpr ext e)
1214 ---------------------
1215 toIfaceNote ext (SCC cc) = IfaceSCC cc
1216 toIfaceNote ext InlineMe = IfaceInlineMe
1217 toIfaceNote ext (CoreNote s) = IfaceCoreNote s
1219 ---------------------
1220 toIfaceBind ext (NonRec b r) = IfaceNonRec (toIfaceIdBndr ext b) (toIfaceExpr ext r)
1221 toIfaceBind ext (Rec prs) = IfaceRec [(toIfaceIdBndr ext b, toIfaceExpr ext r) | (b,r) <- prs]
1223 ---------------------
1224 toIfaceAlt ext (c,bs,r) = (toIfaceCon c, map (occNameFS.getOccName) bs, toIfaceExpr ext r)
1226 ---------------------
1227 toIfaceCon (DataAlt dc) | isTupleTyCon tc = IfaceTupleAlt (tupleTyConBoxity tc)
1228 | otherwise = IfaceDataAlt (getOccName dc)
1230 tc = dataConTyCon dc
1232 toIfaceCon (LitAlt l) = IfaceLitAlt l
1233 toIfaceCon DEFAULT = IfaceDefault
1235 ---------------------
1236 toIfaceApp ext (App f a) as = toIfaceApp ext f (a:as)
1237 toIfaceApp ext (Var v) as
1238 = case isDataConWorkId_maybe v of
1239 -- We convert the *worker* for tuples into IfaceTuples
1240 Just dc | isTupleTyCon tc && saturated
1241 -> IfaceTuple (tupleTyConBoxity tc) tup_args
1243 val_args = dropWhile isTypeArg as
1244 saturated = val_args `lengthIs` idArity v
1245 tup_args = map (toIfaceExpr ext) val_args
1246 tc = dataConTyCon dc
1248 other -> mkIfaceApps ext (toIfaceVar ext v) as
1250 toIfaceApp ext e as = mkIfaceApps ext (toIfaceExpr ext e) as
1252 mkIfaceApps ext f as = foldl (\f a -> IfaceApp f (toIfaceExpr ext a)) f as
1254 ---------------------
1255 toIfaceVar :: (Name -> IfaceExtName) -> Id -> IfaceExpr
1257 | Just fcall <- isFCallId_maybe v = IfaceFCall fcall (toIfaceType ext (idType v))
1258 -- Foreign calls have special syntax
1259 | isExternalName name = IfaceExt (ext name)
1260 | otherwise = IfaceLcl (occNameFS (nameOccName name))