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 )
234 import Util ( createDirectoryHierarchy, directoryOf, sortLe, seqList, lengthIs )
235 import BinIface ( writeBinIface )
236 import Unique ( Unique, Uniquable(..) )
237 import ErrUtils ( dumpIfSet_dyn, showPass )
238 import Digraph ( stronglyConnComp, SCC(..) )
239 import SrcLoc ( SrcSpan )
241 import PackageConfig ( PackageId )
245 import Monad ( when )
246 import List ( insert )
247 import Maybes ( orElse, mapCatMaybes, isNothing, isJust,
248 expectJust, catMaybes, MaybeErr(..) )
253 %************************************************************************
255 \subsection{Completing an interface}
257 %************************************************************************
261 -> Maybe ModIface -- The old interface, if we have it
262 -> ModGuts -- Usages, deprecations, etc
263 -> ModDetails -- The trimmed, tidied interface
264 -> IO (ModIface, -- The new one, complete with decls and versions
265 Bool) -- True <=> there was an old Iface, and the new one
266 -- is identical, so no need to write it
268 mkIface hsc_env maybe_old_iface
269 (ModGuts{ mg_module = this_mod,
273 mg_rdr_env = rdr_env,
274 mg_fix_env = fix_env,
275 mg_deprecs = src_deprecs })
276 (ModDetails{ md_insts = insts,
277 md_fam_insts= _fam_inst, -- we use the type_env instead
280 md_exports = exports })
282 -- NB: notice that mkIface does not look at the bindings
283 -- only at the TypeEnv. The previous Tidy phase has
284 -- put exactly the info into the TypeEnv that we want
285 -- to expose in the interface
287 = do { eps <- hscEPS hsc_env
288 ; let { ext_nm_rhs = mkExtNameFn hsc_env eps this_mod
289 ; ext_nm_lhs = mkLhsNameFn this_mod
291 ; decls = [ tyThingToIfaceDecl ext_nm_rhs thing
292 | thing <- typeEnvElts type_env,
293 let name = getName thing,
294 not (isImplicitName name || isWiredInName name) ]
295 -- Don't put implicit Ids and class tycons in the interface file
296 -- Nor wired-in things; the compiler knows about them anyhow
298 ; fixities = [ (occ,fix)
299 | FixItem occ fix _ <- nameEnvElts fix_env]
300 ; deprecs = mkIfaceDeprec src_deprecs
301 ; iface_rules = map (coreRuleToIfaceRule
302 ext_nm_lhs ext_nm_rhs) rules
303 ; iface_insts = map (instanceToIfaceInst ext_nm_lhs) insts
304 ; iface_fam_insts = extractIfFamInsts decls
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= mkIfaceFamInstsCache decls,
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 ; (new_iface, no_change_at_all, pp_diffs, pp_orphs)
334 = _scc_ "versioninfo"
335 addVersionInfo maybe_old_iface intermediate_iface decls
339 ; when (isJust pp_orphs && dopt Opt_WarnOrphans dflags)
340 (printDump (expectJust "mkIface" pp_orphs))
341 ; when (dopt Opt_D_dump_hi_diffs dflags) (printDump pp_diffs)
342 ; dumpIfSet_dyn dflags Opt_D_dump_hi "FINAL INTERFACE"
343 (pprModIface new_iface)
345 ; return (new_iface, no_change_at_all) }
347 r1 `le_rule` r2 = ifRuleName r1 <= ifRuleName r2
348 i1 `le_inst` i2 = ifDFun i1 <= ifDFun i2
350 dflags = hsc_dflags hsc_env
351 deliberatelyOmitted x = panic ("Deliberately omitted: " ++ x)
354 -----------------------------
355 writeIfaceFile :: ModLocation -> ModIface -> IO ()
356 writeIfaceFile location new_iface
357 = do createDirectoryHierarchy (directoryOf hi_file_path)
358 writeBinIface hi_file_path new_iface
359 where hi_file_path = ml_hi_file location
362 -----------------------------
363 mkExtNameFn :: HscEnv -> ExternalPackageState -> Module -> Name -> IfaceExtName
364 mkExtNameFn hsc_env eps this_mod
367 hpt = hsc_HPT hsc_env
371 | mod == this_mod = case nameParent_maybe name of
372 Nothing -> LocalTop occ
373 Just par -> LocalTopSub occ (nameOccName par)
374 | isWiredInName name = ExtPkg mod occ
375 | is_home mod = HomePkg mod_name occ vers
376 | otherwise = ExtPkg mod occ
378 dflags = hsc_dflags hsc_env
379 this_pkg = thisPackage dflags
380 is_home mod = modulePackageId mod == this_pkg
382 mod = nameModule name
383 mod_name = moduleName mod
384 occ = nameOccName name
385 par_occ = nameOccName (nameParent name)
386 -- The version of the *parent* is the one want
387 vers = lookupVersion mod par_occ occ
389 lookupVersion :: Module -> OccName -> OccName -> Version
390 -- Even though we're looking up a home-package thing, in
391 -- one-shot mode the imported interfaces may be in the PIT
392 lookupVersion mod par_occ occ
393 = mi_ver_fn iface par_occ `orElse`
394 pprPanic "lookupVers1" (ppr mod <+> ppr par_occ <+> ppr occ)
396 iface = lookupIfaceByModule (hsc_dflags hsc_env) hpt pit mod `orElse`
397 pprPanic "lookupVers2" (ppr mod <+> ppr par_occ <+> ppr occ)
400 ---------------------
401 -- mkLhsNameFn ignores versioning info altogether
402 -- It is used for the LHS of instance decls and rules, where we
403 -- there's no point in recording version info
404 mkLhsNameFn :: Module -> Name -> IfaceExtName
405 mkLhsNameFn this_mod name
406 | isInternalName name = pprTrace "mkLhsNameFn: unexpected internal" (ppr name) $
407 LocalTop occ -- Should not happen
408 | mod == this_mod = LocalTop occ
409 | otherwise = ExtPkg mod occ
411 mod = nameModule name
412 occ = nameOccName name
415 -----------------------------
416 -- Compute version numbers for local decls
418 addVersionInfo :: Maybe ModIface -- The old interface, read from M.hi
419 -> ModIface -- The new interface decls (lacking decls)
420 -> [IfaceDecl] -- The new decls
422 Bool, -- True <=> no changes at all; no need to write new Iface
424 Maybe SDoc) -- Warnings about orphans
426 addVersionInfo Nothing new_iface new_decls
427 -- No old interface, so definitely write a new one!
428 = (new_iface { mi_orphan = anyNothing ifInstOrph (mi_insts new_iface)
429 || anyNothing ifRuleOrph (mi_rules new_iface),
430 mi_decls = [(initialVersion, decl) | decl <- new_decls],
431 mi_ver_fn = \n -> Just initialVersion },
433 ptext SLIT("No old interface file"),
434 pprOrphans orph_insts orph_rules)
436 orph_insts = filter (isNothing . ifInstOrph) (mi_insts new_iface)
437 orph_rules = filter (isNothing . ifRuleOrph) (mi_rules new_iface)
439 addVersionInfo (Just old_iface@(ModIface { mi_mod_vers = old_mod_vers,
440 mi_exp_vers = old_exp_vers,
441 mi_rule_vers = old_rule_vers,
442 mi_decls = old_decls,
443 mi_ver_fn = old_decl_vers,
444 mi_fix_fn = old_fixities }))
445 new_iface@(ModIface { mi_fix_fn = new_fixities })
448 | no_change_at_all = (old_iface, True, ptext SLIT("Interface file unchanged"), pp_orphs)
449 | otherwise = (final_iface, False, vcat [ptext SLIT("Interface file has changed"),
450 nest 2 pp_diffs], pp_orphs)
452 final_iface = new_iface { mi_mod_vers = bump_unless no_output_change old_mod_vers,
453 mi_exp_vers = bump_unless no_export_change old_exp_vers,
454 mi_rule_vers = bump_unless no_rule_change old_rule_vers,
455 mi_orphan = not (null new_orph_rules && null new_orph_insts),
456 mi_decls = decls_w_vers,
457 mi_ver_fn = mkIfaceVerCache decls_w_vers }
459 decls_w_vers = [(add_vers decl, decl) | decl <- new_decls]
462 (old_non_orph_insts, old_orph_insts) = mkOrphMap ifInstOrph (mi_insts old_iface)
463 (new_non_orph_insts, new_orph_insts) = mkOrphMap ifInstOrph (mi_insts new_iface)
464 same_insts occ = eqMaybeBy (eqListBy eqIfInst)
465 (lookupOccEnv old_non_orph_insts occ)
466 (lookupOccEnv new_non_orph_insts occ)
468 (old_non_orph_rules, old_orph_rules) = mkOrphMap ifRuleOrph (mi_rules old_iface)
469 (new_non_orph_rules, new_orph_rules) = mkOrphMap ifRuleOrph (mi_rules new_iface)
470 same_rules occ = eqMaybeBy (eqListBy eqIfRule)
471 (lookupOccEnv old_non_orph_rules occ)
472 (lookupOccEnv new_non_orph_rules occ)
474 -- Computing what changed
475 no_output_change = no_decl_change && no_rule_change &&
476 no_export_change && no_deprec_change
477 no_export_change = mi_exports new_iface == mi_exports old_iface -- Kept sorted
478 no_decl_change = isEmptyOccSet changed_occs
479 no_rule_change = not (changedWrt changed_occs (eqListBy eqIfRule old_orph_rules new_orph_rules)
480 || changedWrt changed_occs (eqListBy eqIfInst old_orph_insts new_orph_insts))
481 no_deprec_change = mi_deprecs new_iface == mi_deprecs old_iface
483 -- If the usages havn't changed either, we don't need to write the interface file
484 no_other_changes = mi_usages new_iface == mi_usages old_iface &&
485 mi_deps new_iface == mi_deps old_iface
486 no_change_at_all = no_output_change && no_other_changes
488 pp_diffs = vcat [pp_change no_export_change "Export list"
489 (ppr old_exp_vers <+> arrow <+> ppr (mi_exp_vers final_iface)),
490 pp_change no_rule_change "Rules"
491 (ppr old_rule_vers <+> arrow <+> ppr (mi_rule_vers final_iface)),
492 pp_change no_deprec_change "Deprecations" empty,
493 pp_change no_other_changes "Usages" empty,
495 pp_change True what info = empty
496 pp_change False what info = text what <+> ptext SLIT("changed") <+> info
499 old_decl_env = mkOccEnv [(ifName decl, decl) | (_,decl) <- old_decls]
500 same_fixity n = bool (old_fixities n == new_fixities n)
503 -- Adding version info
504 new_version = bumpVersion old_mod_vers -- Start from the old module version, not from zero
505 -- so that if you remove f, and then add it again,
506 -- you don't thereby reduce f's version number
507 add_vers decl | occ `elemOccSet` changed_occs = new_version
508 | otherwise = expectJust "add_vers" (old_decl_vers occ)
509 -- If it's unchanged, there jolly well
510 where -- should be an old version number
514 changed_occs :: OccSet
515 changed_occs = computeChangedOccs eq_info
517 eq_info :: [(OccName, IfaceEq)]
518 eq_info = map check_eq new_decls
519 check_eq new_decl | Just old_decl <- lookupOccEnv old_decl_env occ
520 = (occ, new_decl `eqIfDecl` old_decl &&&
521 eq_indirects new_decl)
522 | otherwise {- No corresponding old decl -}
525 occ = ifName new_decl
527 eq_indirects :: IfaceDecl -> IfaceEq
528 -- When seeing if two decls are the same, remember to
529 -- check whether any relevant fixity or rules have changed
530 eq_indirects (IfaceId {ifName = occ}) = eq_ind_occ occ
531 eq_indirects (IfaceClass {ifName = cls_occ, ifSigs = sigs})
532 = same_insts cls_occ &&&
533 eq_ind_occs [op | IfaceClassOp op _ _ <- sigs]
534 eq_indirects (IfaceData {ifName = tc_occ, ifCons = cons})
535 = same_insts tc_occ &&& same_fixity tc_occ &&& -- The TyCon can have a fixity too
536 eq_ind_occs (map ifConOcc (visibleIfConDecls cons))
537 eq_indirects other = Equal -- Synonyms and foreign declarations
539 eq_ind_occ :: OccName -> IfaceEq -- For class ops and Ids; check fixity and rules
540 eq_ind_occ occ = same_fixity occ &&& same_rules occ
541 eq_ind_occs = foldr ((&&&) . eq_ind_occ) Equal
545 pp_decl_diffs :: SDoc -- Nothing => no changes
547 | isEmptyOccSet changed_occs = empty
549 = vcat [ptext SLIT("Changed occs:") <+> ppr (occSetElts changed_occs),
550 ptext SLIT("Version change for these decls:"),
551 nest 2 (vcat (map show_change new_decls))]
553 eq_env = mkOccEnv eq_info
555 | not (occ `elemOccSet` changed_occs) = empty
557 = vcat [ppr occ <+> ppr (old_decl_vers occ) <+> arrow <+> ppr new_version,
560 occ = ifName new_decl
561 why = case lookupOccEnv eq_env occ of
562 Just (EqBut occs) -> sep [ppr occ <> colon, ptext SLIT("Free vars (only) changed:"),
563 nest 2 (braces (fsep (map ppr (occSetElts
564 (occs `intersectOccSet` changed_occs)))))]
566 | Just old_decl <- lookupOccEnv old_decl_env occ
567 -> vcat [ptext SLIT("Old:") <+> ppr old_decl,
568 ptext SLIT("New:") <+> ppr new_decl]
570 -> ppr occ <+> ptext SLIT("only in new interface")
571 other -> pprPanic "MkIface.show_change" (ppr occ)
573 pp_orphs = pprOrphans new_orph_insts new_orph_rules
575 pprOrphans insts rules
576 | null insts && null rules = Nothing
579 if null insts then empty else
580 hang (ptext SLIT("Warning: orphan instances:"))
581 2 (vcat (map ppr insts)),
582 if null rules then empty else
583 hang (ptext SLIT("Warning: orphan rules:"))
584 2 (vcat (map ppr rules))
587 computeChangedOccs :: [(OccName, IfaceEq)] -> OccSet
588 computeChangedOccs eq_info
589 = foldl add_changes emptyOccSet (stronglyConnComp edges)
591 edges :: [((OccName,IfaceEq), Unique, [Unique])]
592 edges = [ (node, getUnique occ, map getUnique occs)
593 | node@(occ, iface_eq) <- eq_info
594 , let occs = case iface_eq of
595 EqBut occ_set -> occSetElts occ_set
598 -- Changes in declarations
599 add_changes :: OccSet -> SCC (OccName, IfaceEq) -> OccSet
600 add_changes so_far (AcyclicSCC (occ, iface_eq))
601 | changedWrt so_far iface_eq -- This one has changed
602 = extendOccSet so_far occ
603 add_changes so_far (CyclicSCC pairs)
604 | changedWrt so_far (foldr1 (&&&) (map snd pairs)) -- One of this group has changed
605 = extendOccSetList so_far (map fst pairs)
606 add_changes so_far other = so_far
608 changedWrt :: OccSet -> IfaceEq -> Bool
609 changedWrt so_far Equal = False
610 changedWrt so_far NotEqual = True
611 changedWrt so_far (EqBut kids) = so_far `intersectsOccSet` kids
613 ----------------------
614 -- mkOrphMap partitions instance decls or rules into
615 -- (a) an OccEnv for ones that are not orphans,
616 -- mapping the local OccName to a list of its decls
617 -- (b) a list of orphan decls
618 mkOrphMap :: (decl -> Maybe OccName) -- (Just occ) for a non-orphan decl, keyed by occ
619 -- Nothing for an orphan decl
620 -> [decl] -- Sorted into canonical order
621 -> (OccEnv [decl], -- Non-orphan decls associated with their key;
622 -- each sublist in canonical order
623 [decl]) -- Orphan decls; in canonical order
624 mkOrphMap get_key decls
625 = foldl go (emptyOccEnv, []) decls
627 go (non_orphs, orphs) d
628 | Just occ <- get_key d
629 = (extendOccEnv_C (\ ds _ -> d:ds) non_orphs occ [d], orphs)
630 | otherwise = (non_orphs, d:orphs)
632 anyNothing :: (a -> Maybe b) -> [a] -> Bool
633 anyNothing p [] = False
634 anyNothing p (x:xs) = isNothing (p x) || anyNothing p xs
636 ----------------------
637 mkIfaceDeprec :: Deprecations -> IfaceDeprecs
638 mkIfaceDeprec NoDeprecs = NoDeprecs
639 mkIfaceDeprec (DeprecAll t) = DeprecAll t
640 mkIfaceDeprec (DeprecSome env) = DeprecSome (sortLe (<=) (nameEnvElts env))
642 ----------------------
643 bump_unless :: Bool -> Version -> Version
644 bump_unless True v = v -- True <=> no change
645 bump_unless False v = bumpVersion v
649 %*********************************************************
651 \subsection{Keeping track of what we've slurped, and version numbers}
653 %*********************************************************
657 mkUsageInfo :: HscEnv
658 -> ModuleEnv (Module, Bool, SrcSpan)
659 -> [(ModuleName, IsBootInterface)]
660 -> NameSet -> IO [Usage]
661 mkUsageInfo hsc_env dir_imp_mods dep_mods used_names
662 = do { eps <- hscEPS hsc_env
663 ; let usages = mk_usage_info (eps_PIT eps) hsc_env
664 dir_imp_mods dep_mods used_names
665 ; usages `seqList` return usages }
666 -- seq the list of Usages returned: occasionally these
667 -- don't get evaluated for a while and we can end up hanging on to
668 -- the entire collection of Ifaces.
670 mk_usage_info pit hsc_env dir_imp_mods dep_mods proto_used_names
671 = mapCatMaybes mkUsage dep_mods
672 -- ToDo: do we need to sort into canonical order?
674 hpt = hsc_HPT hsc_env
675 dflags = hsc_dflags hsc_env
677 used_names = mkNameSet $ -- Eliminate duplicates
678 [ nameParent n -- Just record usage on the 'main' names
679 | n <- nameSetToList proto_used_names
680 , not (isWiredInName n) -- Don't record usages for wired-in names
681 , isExternalName n -- Ignore internal names
684 -- ent_map groups together all the things imported and used
685 -- from a particular module in this package
686 ent_map :: ModuleEnv [OccName]
687 ent_map = foldNameSet add_mv emptyModuleEnv used_names
688 add_mv name mv_map = extendModuleEnv_C add_item mv_map mod [occ]
690 occ = nameOccName name
691 mod = nameModule name
692 add_item occs _ = occ:occs
694 depend_on_exports mod = case lookupModuleEnv dir_imp_mods mod of
695 Just (_,no_imp,_) -> not no_imp
698 -- We want to create a Usage for a home module if
699 -- a) we used something from; has something in used_names
700 -- b) we imported all of it, even if we used nothing from it
701 -- (need to recompile if its export list changes: export_vers)
702 -- c) is a home-package orphan module (need to recompile if its
703 -- instance decls change: rules_vers)
704 mkUsage :: (ModuleName, IsBootInterface) -> Maybe Usage
705 mkUsage (mod_name, _)
706 | isNothing maybe_iface -- We can't depend on it if we didn't
707 || (null used_occs -- load its interface.
708 && isNothing export_vers
710 = Nothing -- Record no usage info
713 = Just (Usage { usg_name = mod_name,
715 usg_exports = export_vers,
716 usg_entities = ent_vers,
717 usg_rules = rules_vers })
719 maybe_iface = lookupIfaceByModule dflags hpt pit mod
720 -- In one-shot mode, the interfaces for home-package
721 -- modules accumulate in the PIT not HPT. Sigh.
723 mod = mkModule (thisPackage dflags) mod_name
725 Just iface = maybe_iface
726 orphan_mod = mi_orphan iface
727 version_env = mi_ver_fn iface
728 mod_vers = mi_mod_vers iface
729 rules_vers = mi_rule_vers iface
730 export_vers | depend_on_exports mod = Just (mi_exp_vers iface)
731 | otherwise = Nothing
733 -- The sort is to put them into canonical order
734 used_occs = lookupModuleEnv ent_map mod `orElse` []
735 ent_vers :: [(OccName,Version)]
736 ent_vers = [ (occ, version_env occ `orElse` initialVersion)
737 | occ <- sortLe (<=) used_occs]
741 mkIfaceExports :: NameSet -> [(Module, [GenAvailInfo OccName])]
742 -- Group by module and sort by occurrence
743 -- This keeps the list in canonical order
744 mkIfaceExports exports
745 = [ (mod, eltsUFM avails)
746 | (mod, avails) <- fmToList groupFM
749 groupFM :: ModuleEnv (UniqFM (GenAvailInfo OccName))
750 -- Deliberately use the FastString so we
751 -- get a canonical ordering
752 groupFM = foldl add emptyModuleEnv (nameSetToList exports)
754 add env name = extendModuleEnv_C add_avail env mod
755 (unitUFM avail_fs avail)
757 occ = nameOccName name
758 mod = nameModule name
759 avail | Just p <- nameParent_maybe name = AvailTC (nameOccName p) [occ]
760 | isTcOcc occ = AvailTC occ [occ]
761 | otherwise = Avail occ
762 avail_fs = occNameFS (availName avail)
763 add_avail avail_fm _ = addToUFM_C add_item avail_fm avail_fs avail
765 add_item (AvailTC p occs) _ = AvailTC p (List.insert occ occs)
766 add_item (Avail n) _ = pprPanic "MkIface.addAvail" (ppr n <+> ppr name)
770 %************************************************************************
772 Load the old interface file for this module (unless
773 we have it aleady), and check whether it is up to date
776 %************************************************************************
779 checkOldIface :: HscEnv
781 -> Bool -- Source unchanged
782 -> Maybe ModIface -- Old interface from compilation manager, if any
783 -> IO (RecompileRequired, Maybe ModIface)
785 checkOldIface hsc_env mod_summary source_unchanged maybe_iface
786 = do { showPass (hsc_dflags hsc_env)
787 ("Checking old interface for " ++
788 showSDoc (ppr (ms_mod mod_summary))) ;
790 ; initIfaceCheck hsc_env $
791 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
794 check_old_iface hsc_env mod_summary source_unchanged maybe_iface
795 = do -- CHECK WHETHER THE SOURCE HAS CHANGED
796 { ifM (not source_unchanged)
797 (traceHiDiffs (nest 4 (text "Source file changed or recompilation check turned off")))
799 -- If the source has changed and we're in interactive mode, avoid reading
800 -- an interface; just return the one we might have been supplied with.
801 ; ghc_mode <- getGhcMode
802 ; if (ghc_mode == Interactive || ghc_mode == JustTypecheck)
803 && not source_unchanged then
804 return (outOfDate, maybe_iface)
806 case maybe_iface of {
807 Just old_iface -> do -- Use the one we already have
808 { traceIf (text "We already have the old interface for" <+> ppr (ms_mod mod_summary))
809 ; recomp <- checkVersions hsc_env source_unchanged old_iface
810 ; return (recomp, Just old_iface) }
814 -- Try and read the old interface for the current module
815 -- from the .hi file left from the last time we compiled it
816 { let iface_path = msHiFilePath mod_summary
817 ; read_result <- readIface (ms_mod mod_summary) iface_path False
818 ; case read_result of {
819 Failed err -> do -- Old interface file not found, or garbled; give up
820 { traceIf (text "FYI: cannot read old interface file:"
822 ; return (outOfDate, Nothing) }
824 ; Succeeded iface -> do
826 -- We have got the old iface; check its versions
827 { traceIf (text "Read the interface file" <+> text iface_path)
828 ; recomp <- checkVersions hsc_env source_unchanged iface
829 ; returnM (recomp, Just iface)
833 @recompileRequired@ is called from the HscMain. It checks whether
834 a recompilation is required. It needs access to the persistent state,
835 finder, etc, because it may have to load lots of interface files to
836 check their versions.
839 type RecompileRequired = Bool
840 upToDate = False -- Recompile not required
841 outOfDate = True -- Recompile required
843 checkVersions :: HscEnv
844 -> Bool -- True <=> source unchanged
845 -> ModIface -- Old interface
846 -> IfG RecompileRequired
847 checkVersions hsc_env source_unchanged iface
848 | not source_unchanged
851 = do { traceHiDiffs (text "Considering whether compilation is required for" <+>
852 ppr (mi_module iface) <> colon)
854 -- Source code unchanged and no errors yet... carry on
856 -- First put the dependent-module info, read from the old interface, into the envt,
857 -- so that when we look for interfaces we look for the right one (.hi or .hi-boot)
859 -- It's just temporary because either the usage check will succeed
860 -- (in which case we are done with this module) or it'll fail (in which
861 -- case we'll compile the module from scratch anyhow).
863 -- We do this regardless of compilation mode, although in --make mode
864 -- all the dependent modules should be in the HPT already, so it's
866 ; updateEps_ $ \eps -> eps { eps_is_boot = mod_deps }
868 ; let this_pkg = thisPackage (hsc_dflags hsc_env)
869 ; checkList [checkModUsage this_pkg u | u <- mi_usages iface]
872 -- This is a bit of a hack really
873 mod_deps :: ModuleNameEnv (ModuleName, IsBootInterface)
874 mod_deps = mkModDeps (dep_mods (mi_deps iface))
876 checkModUsage :: PackageId ->Usage -> IfG RecompileRequired
877 -- Given the usage information extracted from the old
878 -- M.hi file for the module being compiled, figure out
879 -- whether M needs to be recompiled.
881 checkModUsage this_pkg (Usage { usg_name = mod_name, usg_mod = old_mod_vers,
882 usg_rules = old_rule_vers,
883 usg_exports = maybe_old_export_vers,
884 usg_entities = old_decl_vers })
885 = -- Load the imported interface is possible
887 doc_str = sep [ptext SLIT("need version info for"), ppr mod_name]
889 traceHiDiffs (text "Checking usages for module" <+> ppr mod_name) `thenM_`
892 mod = mkModule this_pkg mod_name
894 loadInterface doc_str mod ImportBySystem `thenM` \ mb_iface ->
895 -- Load the interface, but don't complain on failure;
896 -- Instead, get an Either back which we can test
899 Failed exn -> (out_of_date (sep [ptext SLIT("Can't find version number for module"),
901 -- Couldn't find or parse a module mentioned in the
902 -- old interface file. Don't complain -- it might just be that
903 -- the current module doesn't need that import and it's been deleted
907 new_mod_vers = mi_mod_vers iface
908 new_decl_vers = mi_ver_fn iface
909 new_export_vers = mi_exp_vers iface
910 new_rule_vers = mi_rule_vers iface
913 checkModuleVersion old_mod_vers new_mod_vers `thenM` \ recompile ->
914 if not recompile then
919 if checkExportList maybe_old_export_vers new_export_vers then
920 out_of_date_vers (ptext SLIT(" Export list changed"))
921 (expectJust "checkModUsage" maybe_old_export_vers)
926 if old_rule_vers /= new_rule_vers then
927 out_of_date_vers (ptext SLIT(" Rules changed"))
928 old_rule_vers new_rule_vers
931 -- CHECK ITEMS ONE BY ONE
932 checkList [checkEntityUsage new_decl_vers u | u <- old_decl_vers] `thenM` \ recompile ->
934 returnM outOfDate -- This one failed, so just bail out now
936 up_to_date (ptext SLIT(" Great! The bits I use are up to date"))
939 ------------------------
940 checkModuleVersion old_mod_vers new_mod_vers
941 | new_mod_vers == old_mod_vers
942 = up_to_date (ptext SLIT("Module version unchanged"))
945 = out_of_date_vers (ptext SLIT(" Module version has changed"))
946 old_mod_vers new_mod_vers
948 ------------------------
949 checkExportList Nothing new_vers = upToDate
950 checkExportList (Just v) new_vers = v /= new_vers
952 ------------------------
953 checkEntityUsage new_vers (name,old_vers)
954 = case new_vers name of
956 Nothing -> -- We used it before, but it ain't there now
957 out_of_date (sep [ptext SLIT("No longer exported:"), ppr name])
959 Just new_vers -- It's there, but is it up to date?
960 | new_vers == old_vers -> traceHiDiffs (text " Up to date" <+> ppr name <+> parens (ppr new_vers)) `thenM_`
962 | otherwise -> out_of_date_vers (ptext SLIT(" Out of date:") <+> ppr name)
965 up_to_date msg = traceHiDiffs msg `thenM_` returnM upToDate
966 out_of_date msg = traceHiDiffs msg `thenM_` returnM outOfDate
967 out_of_date_vers msg old_vers new_vers
968 = out_of_date (hsep [msg, ppr old_vers, ptext SLIT("->"), ppr new_vers])
970 ----------------------
971 checkList :: [IfG RecompileRequired] -> IfG RecompileRequired
972 -- This helper is used in two places
973 checkList [] = returnM upToDate
974 checkList (check:checks) = check `thenM` \ recompile ->
981 %************************************************************************
983 Converting things to their Iface equivalents
985 %************************************************************************
988 tyThingToIfaceDecl :: (Name -> IfaceExtName) -> TyThing -> IfaceDecl
989 -- Assumption: the thing is already tidied, so that locally-bound names
990 -- (lambdas, for-alls) already have non-clashing OccNames
991 -- Reason: Iface stuff uses OccNames, and the conversion here does
992 -- not do tidying on the way
993 tyThingToIfaceDecl ext (AnId id)
994 = IfaceId { ifName = getOccName id,
995 ifType = toIfaceType ext (idType id),
998 info = case toIfaceIdInfo ext (idInfo id) of
1000 items -> HasInfo items
1002 tyThingToIfaceDecl ext (AClass clas)
1003 = IfaceClass { ifCtxt = toIfaceContext ext sc_theta,
1004 ifName = getOccName clas,
1005 ifTyVars = toIfaceTvBndrs clas_tyvars,
1006 ifFDs = map toIfaceFD clas_fds,
1007 ifATs = map (tyThingToIfaceDecl ext . ATyCon) clas_ats,
1008 ifSigs = map toIfaceClassOp op_stuff,
1009 ifRec = boolToRecFlag (isRecursiveTyCon tycon) }
1011 (clas_tyvars, clas_fds, sc_theta, _, clas_ats, op_stuff)
1012 = classExtraBigSig clas
1013 tycon = classTyCon clas
1015 toIfaceClassOp (sel_id, def_meth)
1016 = ASSERT(sel_tyvars == clas_tyvars)
1017 IfaceClassOp (getOccName sel_id) def_meth (toIfaceType ext op_ty)
1019 -- Be careful when splitting the type, because of things
1020 -- like class Foo a where
1021 -- op :: (?x :: String) => a -> a
1022 -- and class Baz a where
1023 -- op :: (Ord a) => a -> a
1024 (sel_tyvars, rho_ty) = splitForAllTys (idType sel_id)
1025 op_ty = funResultTy rho_ty
1027 toIfaceFD (tvs1, tvs2) = (map (occNameFS.getOccName) tvs1, map (occNameFS.getOccName) tvs2)
1029 tyThingToIfaceDecl ext (ATyCon tycon)
1031 = IfaceSyn { ifName = getOccName tycon,
1032 ifTyVars = toIfaceTvBndrs tyvars,
1033 ifOpenSyn = syn_isOpen,
1034 ifSynRhs = toIfaceType ext syn_tyki }
1037 = IfaceData { ifName = getOccName tycon,
1038 ifTyVars = toIfaceTvBndrs tyvars,
1039 ifCtxt = toIfaceContext ext (tyConStupidTheta tycon),
1040 ifCons = ifaceConDecls (algTyConRhs tycon),
1041 ifRec = boolToRecFlag (isRecursiveTyCon tycon),
1042 ifGadtSyntax = isGadtSyntaxTyCon tycon,
1043 ifGeneric = tyConHasGenerics tycon,
1044 ifFamInst = famInstToIface (tyConFamInst_maybe tycon)}
1046 | isForeignTyCon tycon
1047 = IfaceForeign { ifName = getOccName tycon,
1048 ifExtName = tyConExtName tycon }
1050 | isPrimTyCon tycon || isFunTyCon tycon
1051 -- Needed in GHCi for ':info Int#', for example
1052 = IfaceData { ifName = getOccName tycon,
1053 ifTyVars = toIfaceTvBndrs (take (tyConArity tycon) alphaTyVars),
1055 ifCons = IfAbstractTyCon,
1056 ifGadtSyntax = False,
1058 ifRec = NonRecursive,
1059 ifFamInst = Nothing }
1061 | otherwise = pprPanic "toIfaceDecl" (ppr tycon)
1063 tyvars = tyConTyVars tycon
1064 (syn_isOpen, syn_tyki) = case synTyConRhs tycon of
1065 OpenSynTyCon ki -> (True , ki)
1066 SynonymTyCon ty -> (False, ty)
1068 ifaceConDecls (NewTyCon { data_con = con }) =
1069 IfNewTyCon (ifaceConDecl con)
1070 ifaceConDecls (DataTyCon { data_cons = cons }) =
1071 IfDataTyCon (map ifaceConDecl cons)
1072 ifaceConDecls OpenDataTyCon = IfOpenDataTyCon
1073 ifaceConDecls OpenNewTyCon = IfOpenNewTyCon
1074 ifaceConDecls AbstractTyCon = IfAbstractTyCon
1075 -- The last case happens when a TyCon has been trimmed during tidying
1076 -- Furthermore, tyThingToIfaceDecl is also used
1077 -- in TcRnDriver for GHCi, when browsing a module, in which case the
1078 -- AbstractTyCon case is perfectly sensible.
1080 ifaceConDecl data_con
1081 = IfCon { ifConOcc = getOccName (dataConName data_con),
1082 ifConInfix = dataConIsInfix data_con,
1083 ifConUnivTvs = toIfaceTvBndrs (dataConUnivTyVars data_con),
1084 ifConExTvs = toIfaceTvBndrs (dataConExTyVars data_con),
1085 ifConEqSpec = to_eq_spec (dataConEqSpec data_con),
1086 ifConCtxt = toIfaceContext ext (dataConTheta data_con),
1087 ifConArgTys = map (toIfaceType ext)
1088 (dataConOrigArgTys data_con),
1089 ifConFields = map getOccName
1090 (dataConFieldLabels data_con),
1091 ifConStricts = dataConStrictMarks data_con }
1093 to_eq_spec spec = [(getOccName tv, toIfaceType ext ty) | (tv,ty) <- spec]
1095 famInstToIface Nothing = Nothing
1096 famInstToIface (Just (famTyCon, instTys)) =
1097 Just $ IfaceFamInst { ifFamInstTyCon = toIfaceTyCon ext famTyCon
1098 , ifFamInstTys = map (toIfaceType ext) instTys
1101 tyThingToIfaceDecl ext (ADataCon dc)
1102 = pprPanic "toIfaceDecl" (ppr dc) -- Should be trimmed out earlier
1105 --------------------------
1106 instanceToIfaceInst :: (Name -> IfaceExtName) -> Instance -> IfaceInst
1107 instanceToIfaceInst ext_lhs ispec@(Instance { is_dfun = dfun_id, is_flag = oflag,
1108 is_cls = cls, is_tcs = mb_tcs,
1110 = IfaceInst { ifDFun = getOccName dfun_id,
1112 ifInstCls = ext_lhs cls,
1113 ifInstTys = map do_rough mb_tcs,
1116 do_rough Nothing = Nothing
1117 do_rough (Just n) = Just (toIfaceTyCon_name ext_lhs n)
1119 --------------------------
1120 toIfaceIdInfo :: (Name -> IfaceExtName) -> IdInfo -> [IfaceInfoItem]
1121 toIfaceIdInfo ext id_info
1122 = catMaybes [arity_hsinfo, caf_hsinfo, strict_hsinfo,
1123 inline_hsinfo, wrkr_hsinfo, unfold_hsinfo]
1125 ------------ Arity --------------
1126 arity_info = arityInfo id_info
1127 arity_hsinfo | arity_info == 0 = Nothing
1128 | otherwise = Just (HsArity arity_info)
1130 ------------ Caf Info --------------
1131 caf_info = cafInfo id_info
1132 caf_hsinfo = case caf_info of
1133 NoCafRefs -> Just HsNoCafRefs
1136 ------------ Strictness --------------
1137 -- No point in explicitly exporting TopSig
1138 strict_hsinfo = case newStrictnessInfo id_info of
1139 Just sig | not (isTopSig sig) -> Just (HsStrictness sig)
1142 ------------ Worker --------------
1143 work_info = workerInfo id_info
1144 has_worker = case work_info of { HasWorker _ _ -> True; other -> False }
1145 wrkr_hsinfo = case work_info of
1146 HasWorker work_id wrap_arity ->
1147 Just (HsWorker (ext (idName work_id)) wrap_arity)
1150 ------------ Unfolding --------------
1151 -- The unfolding is redundant if there is a worker
1152 unfold_info = unfoldingInfo id_info
1153 rhs = unfoldingTemplate unfold_info
1154 no_unfolding = neverUnfold unfold_info
1155 -- The CoreTidy phase retains unfolding info iff
1156 -- we want to expose the unfolding, taking into account
1157 -- unconditional NOINLINE, etc. See TidyPgm.addExternal
1158 unfold_hsinfo | no_unfolding = Nothing
1159 | has_worker = Nothing -- Unfolding is implicit
1160 | otherwise = Just (HsUnfold (toIfaceExpr ext rhs))
1162 ------------ Inline prag --------------
1163 inline_prag = inlinePragInfo id_info
1164 inline_hsinfo | isAlwaysActive inline_prag = Nothing
1165 | no_unfolding && not has_worker = Nothing
1166 -- If the iface file give no unfolding info, we
1167 -- don't need to say when inlining is OK!
1168 | otherwise = Just (HsInline inline_prag)
1170 --------------------------
1171 coreRuleToIfaceRule :: (Name -> IfaceExtName) -- For the LHS names
1172 -> (Name -> IfaceExtName) -- For the RHS names
1173 -> CoreRule -> IfaceRule
1174 coreRuleToIfaceRule ext_lhs ext_rhs (BuiltinRule { ru_fn = fn})
1175 = pprTrace "toHsRule: builtin" (ppr fn) $
1176 bogusIfaceRule (mkIfaceExtName fn)
1178 coreRuleToIfaceRule ext_lhs ext_rhs
1179 (Rule { ru_name = name, ru_fn = fn, ru_act = act, ru_bndrs = bndrs,
1180 ru_args = args, ru_rhs = rhs, ru_orph = orph })
1181 = IfaceRule { ifRuleName = name, ifActivation = act,
1182 ifRuleBndrs = map (toIfaceBndr ext_lhs) bndrs,
1183 ifRuleHead = ext_lhs fn,
1184 ifRuleArgs = map do_arg args,
1185 ifRuleRhs = toIfaceExpr ext_rhs rhs,
1188 -- For type args we must remove synonyms from the outermost
1189 -- level. Reason: so that when we read it back in we'll
1190 -- construct the same ru_rough field as we have right now;
1192 do_arg (Type ty) = IfaceType (toIfaceType ext_lhs (deNoteType ty))
1193 do_arg arg = toIfaceExpr ext_lhs arg
1195 bogusIfaceRule :: IfaceExtName -> IfaceRule
1196 bogusIfaceRule id_name
1197 = IfaceRule { ifRuleName = FSLIT("bogus"), ifActivation = NeverActive,
1198 ifRuleBndrs = [], ifRuleHead = id_name, ifRuleArgs = [],
1199 ifRuleRhs = IfaceExt id_name, ifRuleOrph = Nothing }
1201 ---------------------
1202 toIfaceExpr :: (Name -> IfaceExtName) -> CoreExpr -> IfaceExpr
1203 toIfaceExpr ext (Var v) = toIfaceVar ext v
1204 toIfaceExpr ext (Lit l) = IfaceLit l
1205 toIfaceExpr ext (Type ty) = IfaceType (toIfaceType ext ty)
1206 toIfaceExpr ext (Lam x b) = IfaceLam (toIfaceBndr ext x) (toIfaceExpr ext b)
1207 toIfaceExpr ext (App f a) = toIfaceApp ext f [a]
1208 toIfaceExpr ext (Case s x ty as) = IfaceCase (toIfaceExpr ext s) (occNameFS (getOccName x)) (toIfaceType ext ty) (map (toIfaceAlt ext) as)
1209 toIfaceExpr ext (Let b e) = IfaceLet (toIfaceBind ext b) (toIfaceExpr ext e)
1210 toIfaceExpr ext (Cast e co) = IfaceCast (toIfaceExpr ext e) (toIfaceType ext co)
1211 toIfaceExpr ext (Note n e) = IfaceNote (toIfaceNote ext n) (toIfaceExpr ext e)
1213 ---------------------
1214 toIfaceNote ext (SCC cc) = IfaceSCC cc
1215 toIfaceNote ext InlineMe = IfaceInlineMe
1216 toIfaceNote ext (CoreNote s) = IfaceCoreNote s
1218 ---------------------
1219 toIfaceBind ext (NonRec b r) = IfaceNonRec (toIfaceIdBndr ext b) (toIfaceExpr ext r)
1220 toIfaceBind ext (Rec prs) = IfaceRec [(toIfaceIdBndr ext b, toIfaceExpr ext r) | (b,r) <- prs]
1222 ---------------------
1223 toIfaceAlt ext (c,bs,r) = (toIfaceCon c, map (occNameFS.getOccName) bs, toIfaceExpr ext r)
1225 ---------------------
1226 toIfaceCon (DataAlt dc) | isTupleTyCon tc = IfaceTupleAlt (tupleTyConBoxity tc)
1227 | otherwise = IfaceDataAlt (getOccName dc)
1229 tc = dataConTyCon dc
1231 toIfaceCon (LitAlt l) = IfaceLitAlt l
1232 toIfaceCon DEFAULT = IfaceDefault
1234 ---------------------
1235 toIfaceApp ext (App f a) as = toIfaceApp ext f (a:as)
1236 toIfaceApp ext (Var v) as
1237 = case isDataConWorkId_maybe v of
1238 -- We convert the *worker* for tuples into IfaceTuples
1239 Just dc | isTupleTyCon tc && saturated
1240 -> IfaceTuple (tupleTyConBoxity tc) tup_args
1242 val_args = dropWhile isTypeArg as
1243 saturated = val_args `lengthIs` idArity v
1244 tup_args = map (toIfaceExpr ext) val_args
1245 tc = dataConTyCon dc
1247 other -> mkIfaceApps ext (toIfaceVar ext v) as
1249 toIfaceApp ext e as = mkIfaceApps ext (toIfaceExpr ext e) as
1251 mkIfaceApps ext f as = foldl (\f a -> IfaceApp f (toIfaceExpr ext a)) f as
1253 ---------------------
1254 toIfaceVar :: (Name -> IfaceExtName) -> Id -> IfaceExpr
1256 | Just fcall <- isFCallId_maybe v = IfaceFCall fcall (toIfaceType ext (idType v))
1257 -- Foreign calls have special syntax
1258 | isExternalName name = IfaceExt (ext name)
1259 | otherwise = IfaceLcl (occNameFS (nameOccName name))