2 % (c) The University of Glasgow 2006
3 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
6 Type checking of type signatures in interface files
10 tcImportDecl, checkWiredInTyCon, tcHiBootIface, typecheckIface,
11 tcIfaceDecl, tcIfaceInst, tcIfaceFamInst, tcIfaceRules,
12 tcIfaceVectInfo, tcIfaceAnnotations, tcIfaceGlobal, tcExtCoreBindings
15 #include "HsVersions.h"
22 import TcType ( tcSplitSigmaTy )
57 import BasicTypes (Arity)
70 An IfaceDecl is populated with RdrNames, and these are not renamed to
71 Names before typechecking, because there should be no scope errors etc.
73 -- For (b) consider: f = \$(...h....)
74 -- where h is imported, and calls f via an hi-boot file.
75 -- This is bad! But it is not seen as a staging error, because h
76 -- is indeed imported. We don't want the type-checker to black-hole
77 -- when simplifying and compiling the splice!
79 -- Simple solution: discard any unfolding that mentions a variable
80 -- bound in this module (and hence not yet processed).
81 -- The discarding happens when forkM finds a type error.
83 %************************************************************************
85 %* tcImportDecl is the key function for "faulting in" *
88 %************************************************************************
90 The main idea is this. We are chugging along type-checking source code, and
91 find a reference to GHC.Base.map. We call tcLookupGlobal, which doesn't find
92 it in the EPS type envt. So it
94 2 gets the decl for GHC.Base.map
95 3 typechecks it via tcIfaceDecl
96 4 and adds it to the type env in the EPS
98 Note that DURING STEP 4, we may find that map's type mentions a type
101 Notice that for imported things we read the current version from the EPS
102 mutable variable. This is important in situations like
104 where the code that e1 expands to might import some defns that
105 also turn out to be needed by the code that e2 expands to.
108 tcImportDecl :: Name -> TcM TyThing
109 -- Entry point for *source-code* uses of importDecl
111 | Just thing <- wiredInNameTyThing_maybe name
112 = do { when (needWiredInHomeIface thing)
113 (initIfaceTcRn (loadWiredInHomeIface name))
114 -- See Note [Loading instances for wired-in things]
117 = do { traceIf (text "tcImportDecl" <+> ppr name)
118 ; mb_thing <- initIfaceTcRn (importDecl name)
120 Succeeded thing -> return thing
121 Failed err -> failWithTc err }
123 importDecl :: Name -> IfM lcl (MaybeErr Message TyThing)
124 -- Get the TyThing for this Name from an interface file
125 -- It's not a wired-in thing -- the caller caught that
127 = ASSERT( not (isWiredInName name) )
130 -- Load the interface, which should populate the PTE
131 ; mb_iface <- ASSERT2( isExternalName name, ppr name )
132 loadInterface nd_doc (nameModule name) ImportBySystem
134 Failed err_msg -> return (Failed err_msg) ;
137 -- Now look it up again; this time we should find it
139 ; case lookupTypeEnv (eps_PTE eps) name of
140 Just thing -> return (Succeeded thing)
141 Nothing -> return (Failed not_found_msg)
144 nd_doc = ptext (sLit "Need decl for") <+> ppr name
145 not_found_msg = hang (ptext (sLit "Can't find interface-file declaration for") <+>
146 pprNameSpace (occNameSpace (nameOccName name)) <+> ppr name)
147 2 (vcat [ptext (sLit "Probable cause: bug in .hi-boot file, or inconsistent .hi file"),
148 ptext (sLit "Use -ddump-if-trace to get an idea of which file caused the error")])
151 %************************************************************************
153 Checks for wired-in things
155 %************************************************************************
157 Note [Loading instances for wired-in things]
158 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
159 We need to make sure that we have at least *read* the interface files
160 for any module with an instance decl or RULE that we might want.
162 * If the instance decl is an orphan, we have a whole separate mechanism
165 * If the instance decl not an orphan, then the act of looking at the
166 TyCon or Class will force in the defining module for the
167 TyCon/Class, and hence the instance decl
169 * BUT, if the TyCon is a wired-in TyCon, we don't really need its interface;
170 but we must make sure we read its interface in case it has instances or
171 rules. That is what LoadIface.loadWiredInHomeInterface does. It's called
172 from TcIface.{tcImportDecl, checkWiredInTyCon, ifCheckWiredInThing}
174 * HOWEVER, only do this for TyCons. There are no wired-in Classes. There
175 are some wired-in Ids, but we don't want to load their interfaces. For
176 example, Control.Exception.Base.recSelError is wired in, but that module
177 is compiled late in the base library, and we don't want to force it to
178 load before it's been compiled!
180 All of this is done by the type checker. The renamer plays no role.
181 (It used to, but no longer.)
185 checkWiredInTyCon :: TyCon -> TcM ()
186 -- Ensure that the home module of the TyCon (and hence its instances)
187 -- are loaded. See Note [Loading instances for wired-in things]
188 -- It might not be a wired-in tycon (see the calls in TcUnify),
189 -- in which case this is a no-op.
191 | not (isWiredInName tc_name)
194 = do { mod <- getModule
195 ; ASSERT( isExternalName tc_name )
196 when (mod /= nameModule tc_name)
197 (initIfaceTcRn (loadWiredInHomeIface tc_name))
198 -- Don't look for (non-existent) Float.hi when
199 -- compiling Float.lhs, which mentions Float of course
200 -- A bit yukky to call initIfaceTcRn here
203 tc_name = tyConName tc
205 ifCheckWiredInThing :: TyThing -> IfL ()
206 -- Even though we are in an interface file, we want to make
207 -- sure the instances of a wired-in thing are loaded (imagine f :: Double -> Double)
208 -- Ditto want to ensure that RULES are loaded too
209 -- See Note [Loading instances for wired-in things]
210 ifCheckWiredInThing thing
211 = do { mod <- getIfModule
212 -- Check whether we are typechecking the interface for this
213 -- very module. E.g when compiling the base library in --make mode
214 -- we may typecheck GHC.Base.hi. At that point, GHC.Base is not in
215 -- the HPT, so without the test we'll demand-load it into the PIT!
216 -- C.f. the same test in checkWiredInTyCon above
217 ; let name = getName thing
218 ; ASSERT2( isExternalName name, ppr name )
219 when (needWiredInHomeIface thing && mod /= nameModule name)
220 (loadWiredInHomeIface name) }
222 needWiredInHomeIface :: TyThing -> Bool
223 -- Only for TyCons; see Note [Loading instances for wired-in things]
224 needWiredInHomeIface (ATyCon {}) = True
225 needWiredInHomeIface _ = False
228 %************************************************************************
230 Type-checking a complete interface
232 %************************************************************************
234 Suppose we discover we don't need to recompile. Then we must type
235 check the old interface file. This is a bit different to the
236 incremental type checking we do as we suck in interface files. Instead
237 we do things similarly as when we are typechecking source decls: we
238 bring into scope the type envt for the interface all at once, using a
239 knot. Remember, the decls aren't necessarily in dependency order --
240 and even if they were, the type decls might be mutually recursive.
243 typecheckIface :: ModIface -- Get the decls from here
244 -> TcRnIf gbl lcl ModDetails
246 = initIfaceTc iface $ \ tc_env_var -> do
247 -- The tc_env_var is freshly allocated, private to
248 -- type-checking this particular interface
249 { -- Get the right set of decls and rules. If we are compiling without -O
250 -- we discard pragmas before typechecking, so that we don't "see"
251 -- information that we shouldn't. From a versioning point of view
252 -- It's not actually *wrong* to do so, but in fact GHCi is unable
253 -- to handle unboxed tuples, so it must not see unfoldings.
254 ignore_prags <- doptM Opt_IgnoreInterfacePragmas
256 -- Typecheck the decls. This is done lazily, so that the knot-tying
257 -- within this single module work out right. In the If monad there is
258 -- no global envt for the current interface; instead, the knot is tied
259 -- through the if_rec_types field of IfGblEnv
260 ; names_w_things <- loadDecls ignore_prags (mi_decls iface)
261 ; let type_env = mkNameEnv names_w_things
262 ; writeMutVar tc_env_var type_env
264 -- Now do those rules, instances and annotations
265 ; insts <- mapM tcIfaceInst (mi_insts iface)
266 ; fam_insts <- mapM tcIfaceFamInst (mi_fam_insts iface)
267 ; rules <- tcIfaceRules ignore_prags (mi_rules iface)
268 ; anns <- tcIfaceAnnotations (mi_anns iface)
270 -- Vectorisation information
271 ; vect_info <- tcIfaceVectInfo (mi_module iface) type_env
275 ; exports <- ifaceExportNames (mi_exports iface)
278 ; traceIf (vcat [text "Finished typechecking interface for" <+> ppr (mi_module iface),
279 text "Type envt:" <+> ppr type_env])
280 ; return $ ModDetails { md_types = type_env
282 , md_fam_insts = fam_insts
285 , md_vect_info = vect_info
286 , md_exports = exports
292 %************************************************************************
294 Type and class declarations
296 %************************************************************************
299 tcHiBootIface :: HscSource -> Module -> TcRn ModDetails
300 -- Load the hi-boot iface for the module being compiled,
301 -- if it indeed exists in the transitive closure of imports
302 -- Return the ModDetails, empty if no hi-boot iface
303 tcHiBootIface hsc_src mod
304 | isHsBoot hsc_src -- Already compiling a hs-boot file
305 = return emptyModDetails
307 = do { traceIf (text "loadHiBootInterface" <+> ppr mod)
310 ; if not (isOneShot mode)
311 -- In --make and interactive mode, if this module has an hs-boot file
312 -- we'll have compiled it already, and it'll be in the HPT
314 -- We check wheher the interface is a *boot* interface.
315 -- It can happen (when using GHC from Visual Studio) that we
316 -- compile a module in TypecheckOnly mode, with a stable,
317 -- fully-populated HPT. In that case the boot interface isn't there
318 -- (it's been replaced by the mother module) so we can't check it.
319 -- And that's fine, because if M's ModInfo is in the HPT, then
320 -- it's been compiled once, and we don't need to check the boot iface
321 then do { hpt <- getHpt
322 ; case lookupUFM hpt (moduleName mod) of
323 Just info | mi_boot (hm_iface info)
324 -> return (hm_details info)
325 _ -> return emptyModDetails }
328 -- OK, so we're in one-shot mode.
329 -- In that case, we're read all the direct imports by now,
330 -- so eps_is_boot will record if any of our imports mention us by
331 -- way of hi-boot file
333 ; case lookupUFM (eps_is_boot eps) (moduleName mod) of {
334 Nothing -> return emptyModDetails ; -- The typical case
336 Just (_, False) -> failWithTc moduleLoop ;
337 -- Someone below us imported us!
338 -- This is a loop with no hi-boot in the way
340 Just (_mod, True) -> -- There's a hi-boot interface below us
342 do { read_result <- findAndReadIface
346 ; case read_result of
347 Failed err -> failWithTc (elaborate err)
348 Succeeded (iface, _path) -> typecheckIface iface
351 need = ptext (sLit "Need the hi-boot interface for") <+> ppr mod
352 <+> ptext (sLit "to compare against the Real Thing")
354 moduleLoop = ptext (sLit "Circular imports: module") <+> quotes (ppr mod)
355 <+> ptext (sLit "depends on itself")
357 elaborate err = hang (ptext (sLit "Could not find hi-boot interface for") <+>
358 quotes (ppr mod) <> colon) 4 err
362 %************************************************************************
364 Type and class declarations
366 %************************************************************************
368 When typechecking a data type decl, we *lazily* (via forkM) typecheck
369 the constructor argument types. This is in the hope that we may never
370 poke on those argument types, and hence may never need to load the
371 interface files for types mentioned in the arg types.
374 data Foo.S = MkS Baz.T
375 Mabye we can get away without even loading the interface for Baz!
377 This is not just a performance thing. Suppose we have
378 data Foo.S = MkS Baz.T
379 data Baz.T = MkT Foo.S
380 (in different interface files, of course).
381 Now, first we load and typecheck Foo.S, and add it to the type envt.
382 If we do explore MkS's argument, we'll load and typecheck Baz.T.
383 If we explore MkT's argument we'll find Foo.S already in the envt.
385 If we typechecked constructor args eagerly, when loading Foo.S we'd try to
386 typecheck the type Baz.T. So we'd fault in Baz.T... and then need Foo.S...
387 which isn't done yet.
389 All very cunning. However, there is a rather subtle gotcha which bit
390 me when developing this stuff. When we typecheck the decl for S, we
391 extend the type envt with S, MkS, and all its implicit Ids. Suppose
392 (a bug, but it happened) that the list of implicit Ids depended in
393 turn on the constructor arg types. Then the following sequence of
395 * we build a thunk <t> for the constructor arg tys
396 * we build a thunk for the extended type environment (depends on <t>)
397 * we write the extended type envt into the global EPS mutvar
399 Now we look something up in the type envt
401 * which reads the global type envt out of the global EPS mutvar
402 * but that depends in turn on <t>
404 It's subtle, because, it'd work fine if we typechecked the constructor args
405 eagerly -- they don't need the extended type envt. They just get the extended
406 type envt by accident, because they look at it later.
408 What this means is that the implicitTyThings MUST NOT DEPEND on any of
413 tcIfaceDecl :: Bool -- True <=> discard IdInfo on IfaceId bindings
417 tcIfaceDecl ignore_prags (IfaceId {ifName = occ_name, ifType = iface_type,
418 ifIdDetails = details, ifIdInfo = info})
419 = do { name <- lookupIfaceTop occ_name
420 ; ty <- tcIfaceType iface_type
421 ; details <- tcIdDetails ty details
422 ; info <- tcIdInfo ignore_prags name ty info
423 ; return (AnId (mkGlobalId details name ty info)) }
425 tcIfaceDecl _ (IfaceData {ifName = occ_name,
427 ifCtxt = ctxt, ifGadtSyntax = gadt_syn,
430 ifGeneric = want_generic,
431 ifFamInst = mb_family })
432 = bindIfaceTyVars_AT tv_bndrs $ \ tyvars -> do
433 { tc_name <- lookupIfaceTop occ_name
434 ; tycon <- fixM ( \ tycon -> do
435 { stupid_theta <- tcIfaceCtxt ctxt
436 ; mb_fam_inst <- tcFamInst mb_family
437 ; cons <- tcIfaceDataCons tc_name tycon tyvars rdr_cons
438 ; buildAlgTyCon tc_name tyvars stupid_theta
439 cons is_rec want_generic gadt_syn mb_fam_inst
441 ; traceIf (text "tcIfaceDecl4" <+> ppr tycon)
442 ; return (ATyCon tycon) }
444 tcIfaceDecl _ (IfaceSyn {ifName = occ_name, ifTyVars = tv_bndrs,
445 ifSynRhs = mb_rhs_ty,
446 ifSynKind = kind, ifFamInst = mb_family})
447 = bindIfaceTyVars_AT tv_bndrs $ \ tyvars -> do
448 { tc_name <- lookupIfaceTop occ_name
449 ; rhs_kind <- tcIfaceType kind -- Note [Synonym kind loop]
450 ; ~(rhs, fam) <- forkM (mk_doc tc_name) $
451 do { rhs <- tc_syn_rhs rhs_kind mb_rhs_ty
452 ; fam <- tcFamInst mb_family
453 ; return (rhs, fam) }
454 ; tycon <- buildSynTyCon tc_name tyvars rhs rhs_kind fam
455 ; return $ ATyCon tycon
458 mk_doc n = ptext (sLit "Type syonym") <+> ppr n
459 tc_syn_rhs kind Nothing = return (OpenSynTyCon kind Nothing)
460 tc_syn_rhs _ (Just ty) = do { rhs_ty <- tcIfaceType ty
461 ; return (SynonymTyCon rhs_ty) }
463 tcIfaceDecl ignore_prags
464 (IfaceClass {ifCtxt = rdr_ctxt, ifName = occ_name,
465 ifTyVars = tv_bndrs, ifFDs = rdr_fds,
466 ifATs = rdr_ats, ifSigs = rdr_sigs,
468 -- ToDo: in hs-boot files we should really treat abstract classes specially,
469 -- as we do abstract tycons
470 = bindIfaceTyVars tv_bndrs $ \ tyvars -> do
471 { cls_name <- lookupIfaceTop occ_name
472 ; ctxt <- tcIfaceCtxt rdr_ctxt
473 ; sigs <- mapM tc_sig rdr_sigs
474 ; fds <- mapM tc_fd rdr_fds
475 ; ats' <- mapM (tcIfaceDecl ignore_prags) rdr_ats
476 ; let ats = map (setAssocFamilyPermutation tyvars) ats'
477 ; cls <- buildClass ignore_prags cls_name tyvars ctxt fds ats sigs tc_isrec
478 ; return (AClass cls) }
480 tc_sig (IfaceClassOp occ dm rdr_ty)
481 = do { op_name <- lookupIfaceTop occ
482 ; op_ty <- forkM (mk_doc op_name rdr_ty) (tcIfaceType rdr_ty)
483 -- Must be done lazily for just the same reason as the
484 -- type of a data con; to avoid sucking in types that
485 -- it mentions unless it's necessray to do so
486 ; return (op_name, dm, op_ty) }
488 mk_doc op_name op_ty = ptext (sLit "Class op") <+> sep [ppr op_name, ppr op_ty]
490 tc_fd (tvs1, tvs2) = do { tvs1' <- mapM tcIfaceTyVar tvs1
491 ; tvs2' <- mapM tcIfaceTyVar tvs2
492 ; return (tvs1', tvs2') }
494 tcIfaceDecl _ (IfaceForeign {ifName = rdr_name, ifExtName = ext_name})
495 = do { name <- lookupIfaceTop rdr_name
496 ; return (ATyCon (mkForeignTyCon name ext_name
499 tcFamInst :: Maybe (IfaceTyCon, [IfaceType]) -> IfL (Maybe (TyCon, [Type]))
500 tcFamInst Nothing = return Nothing
501 tcFamInst (Just (fam, tys)) = do { famTyCon <- tcIfaceTyCon fam
502 ; insttys <- mapM tcIfaceType tys
503 ; return $ Just (famTyCon, insttys) }
505 tcIfaceDataCons :: Name -> TyCon -> [TyVar] -> IfaceConDecls -> IfL AlgTyConRhs
506 tcIfaceDataCons tycon_name tycon _ if_cons
508 IfAbstractTyCon -> return mkAbstractTyConRhs
509 IfOpenDataTyCon -> return mkOpenDataTyConRhs
510 IfDataTyCon cons -> do { data_cons <- mapM tc_con_decl cons
511 ; return (mkDataTyConRhs data_cons) }
512 IfNewTyCon con -> do { data_con <- tc_con_decl con
513 ; mkNewTyConRhs tycon_name tycon data_con }
515 tc_con_decl (IfCon { ifConInfix = is_infix,
516 ifConUnivTvs = univ_tvs, ifConExTvs = ex_tvs,
517 ifConOcc = occ, ifConCtxt = ctxt, ifConEqSpec = spec,
518 ifConArgTys = args, ifConFields = field_lbls,
519 ifConStricts = stricts})
520 = bindIfaceTyVars univ_tvs $ \ univ_tyvars -> do
521 bindIfaceTyVars ex_tvs $ \ ex_tyvars -> do
522 { name <- lookupIfaceTop occ
523 ; eq_spec <- tcIfaceEqSpec spec
524 ; theta <- tcIfaceCtxt ctxt -- Laziness seems not worth the bother here
525 -- At one stage I thought that this context checking *had*
526 -- to be lazy, because of possible mutual recursion between the
527 -- type and the classe:
529 -- class Real a where { toRat :: a -> Ratio Integer }
530 -- data (Real a) => Ratio a = ...
531 -- But now I think that the laziness in checking class ops breaks
532 -- the loop, so no laziness needed
534 -- Read the argument types, but lazily to avoid faulting in
535 -- the component types unless they are really needed
536 ; arg_tys <- forkM (mk_doc name) (mapM tcIfaceType args)
537 ; lbl_names <- mapM lookupIfaceTop field_lbls
539 -- Remember, tycon is the representation tycon
540 ; let orig_res_ty = mkFamilyTyConApp tycon
541 (substTyVars (mkTopTvSubst eq_spec) univ_tyvars)
543 ; buildDataCon name is_infix {- Not infix -}
545 univ_tyvars ex_tyvars
547 arg_tys orig_res_ty tycon
549 mk_doc con_name = ptext (sLit "Constructor") <+> ppr con_name
551 tcIfaceEqSpec :: [(OccName, IfaceType)] -> IfL [(TyVar, Type)]
555 do_item (occ, if_ty) = do { tv <- tcIfaceTyVar (occNameFS occ)
556 ; ty <- tcIfaceType if_ty
560 Note [Synonym kind loop]
561 ~~~~~~~~~~~~~~~~~~~~~~~~
562 Notice that we eagerly grab the *kind* from the interface file, but
563 build a forkM thunk for the *rhs* (and family stuff). To see why,
564 consider this (Trac #2412)
566 M.hs: module M where { import X; data T = MkT S }
567 X.hs: module X where { import {-# SOURCE #-} M; type S = T }
568 M.hs-boot: module M where { data T }
570 When kind-checking M.hs we need S's kind. But we do not want to
571 find S's kind from (typeKind S-rhs), because we don't want to look at
572 S-rhs yet! Since S is imported from X.hi, S gets just one chance to
573 be defined, and we must not do that until we've finished with M.T.
575 Solution: record S's kind in the interface file; now we can safely
578 %************************************************************************
582 %************************************************************************
585 tcIfaceInst :: IfaceInst -> IfL Instance
586 tcIfaceInst (IfaceInst { ifDFun = dfun_occ, ifOFlag = oflag,
587 ifInstCls = cls, ifInstTys = mb_tcs })
588 = do { dfun <- forkM (ptext (sLit "Dict fun") <+> ppr dfun_occ) $
589 tcIfaceExtId dfun_occ
590 ; let mb_tcs' = map (fmap ifaceTyConName) mb_tcs
591 ; return (mkImportedInstance cls mb_tcs' dfun oflag) }
593 tcIfaceFamInst :: IfaceFamInst -> IfL FamInst
594 tcIfaceFamInst (IfaceFamInst { ifFamInstTyCon = tycon,
595 ifFamInstFam = fam, ifFamInstTys = mb_tcs })
596 -- { tycon' <- forkM (ptext (sLit "Inst tycon") <+> ppr tycon) $
597 -- the above line doesn't work, but this below does => CPP in Haskell = evil!
598 = do tycon' <- forkM (text ("Inst tycon") <+> ppr tycon) $
600 let mb_tcs' = map (fmap ifaceTyConName) mb_tcs
601 return (mkImportedFamInst fam mb_tcs' tycon')
605 %************************************************************************
609 %************************************************************************
611 We move a IfaceRule from eps_rules to eps_rule_base when all its LHS free vars
612 are in the type environment. However, remember that typechecking a Rule may
613 (as a side effect) augment the type envt, and so we may need to iterate the process.
616 tcIfaceRules :: Bool -- True <=> ignore rules
619 tcIfaceRules ignore_prags if_rules
620 | ignore_prags = return []
621 | otherwise = mapM tcIfaceRule if_rules
623 tcIfaceRule :: IfaceRule -> IfL CoreRule
624 tcIfaceRule (IfaceRule {ifRuleName = name, ifActivation = act, ifRuleBndrs = bndrs,
625 ifRuleHead = fn, ifRuleArgs = args, ifRuleRhs = rhs })
626 = do { ~(bndrs', args', rhs') <-
627 -- Typecheck the payload lazily, in the hope it'll never be looked at
628 forkM (ptext (sLit "Rule") <+> ftext name) $
629 bindIfaceBndrs bndrs $ \ bndrs' ->
630 do { args' <- mapM tcIfaceExpr args
631 ; rhs' <- tcIfaceExpr rhs
632 ; return (bndrs', args', rhs') }
633 ; let mb_tcs = map ifTopFreeName args
634 ; return (Rule { ru_name = name, ru_fn = fn, ru_act = act,
635 ru_bndrs = bndrs', ru_args = args',
638 ru_local = False }) } -- An imported RULE is never for a local Id
639 -- or, even if it is (module loop, perhaps)
640 -- we'll just leave it in the non-local set
642 -- This function *must* mirror exactly what Rules.topFreeName does
643 -- We could have stored the ru_rough field in the iface file
644 -- but that would be redundant, I think.
645 -- The only wrinkle is that we must not be deceived by
646 -- type syononyms at the top of a type arg. Since
647 -- we can't tell at this point, we are careful not
648 -- to write them out in coreRuleToIfaceRule
649 ifTopFreeName :: IfaceExpr -> Maybe Name
650 ifTopFreeName (IfaceType (IfaceTyConApp tc _ )) = Just (ifaceTyConName tc)
651 ifTopFreeName (IfaceApp f _) = ifTopFreeName f
652 ifTopFreeName (IfaceExt n) = Just n
653 ifTopFreeName _ = Nothing
657 %************************************************************************
661 %************************************************************************
664 tcIfaceAnnotations :: [IfaceAnnotation] -> IfL [Annotation]
665 tcIfaceAnnotations = mapM tcIfaceAnnotation
667 tcIfaceAnnotation :: IfaceAnnotation -> IfL Annotation
668 tcIfaceAnnotation (IfaceAnnotation target serialized) = do
669 target' <- tcIfaceAnnTarget target
670 return $ Annotation {
671 ann_target = target',
672 ann_value = serialized
675 tcIfaceAnnTarget :: IfaceAnnTarget -> IfL (AnnTarget Name)
676 tcIfaceAnnTarget (NamedTarget occ) = do
677 name <- lookupIfaceTop occ
678 return $ NamedTarget name
679 tcIfaceAnnTarget (ModuleTarget mod) = do
680 return $ ModuleTarget mod
685 %************************************************************************
687 Vectorisation information
689 %************************************************************************
692 tcIfaceVectInfo :: Module -> TypeEnv -> IfaceVectInfo -> IfL VectInfo
693 tcIfaceVectInfo mod typeEnv (IfaceVectInfo
694 { ifaceVectInfoVar = vars
695 , ifaceVectInfoTyCon = tycons
696 , ifaceVectInfoTyConReuse = tyconsReuse
698 = do { vVars <- mapM vectVarMapping vars
699 ; tyConRes1 <- mapM vectTyConMapping tycons
700 ; tyConRes2 <- mapM vectTyConReuseMapping tyconsReuse
701 ; let (vTyCons, vDataCons, vPAs, vIsos) = unzip4 (tyConRes1 ++ tyConRes2)
703 { vectInfoVar = mkVarEnv vVars
704 , vectInfoTyCon = mkNameEnv vTyCons
705 , vectInfoDataCon = mkNameEnv (concat vDataCons)
706 , vectInfoPADFun = mkNameEnv vPAs
707 , vectInfoIso = mkNameEnv vIsos
712 = do { vName <- lookupOrig mod (mkVectOcc (nameOccName name))
713 ; let { var = lookupVar name
714 ; vVar = lookupVar vName
716 ; return (var, (var, vVar))
718 vectTyConMapping name
719 = do { vName <- lookupOrig mod (mkVectTyConOcc (nameOccName name))
720 ; paName <- lookupOrig mod (mkPADFunOcc (nameOccName name))
721 ; isoName <- lookupOrig mod (mkVectIsoOcc (nameOccName name))
722 ; let { tycon = lookupTyCon name
723 ; vTycon = lookupTyCon vName
724 ; paTycon = lookupVar paName
725 ; isoTycon = lookupVar isoName
727 ; vDataCons <- mapM vectDataConMapping (tyConDataCons tycon)
728 ; return ((name, (tycon, vTycon)), -- (T, T_v)
729 vDataCons, -- list of (Ci, Ci_v)
730 (vName, (vTycon, paTycon)), -- (T_v, paT)
731 (name, (tycon, isoTycon))) -- (T, isoT)
733 vectTyConReuseMapping name
734 = do { paName <- lookupOrig mod (mkPADFunOcc (nameOccName name))
735 ; isoName <- lookupOrig mod (mkVectIsoOcc (nameOccName name))
736 ; let { tycon = lookupTyCon name
737 ; paTycon = lookupVar paName
738 ; isoTycon = lookupVar isoName
739 ; vDataCons = [ (dataConName dc, (dc, dc))
740 | dc <- tyConDataCons tycon]
742 ; return ((name, (tycon, tycon)), -- (T, T)
743 vDataCons, -- list of (Ci, Ci)
744 (name, (tycon, paTycon)), -- (T, paT)
745 (name, (tycon, isoTycon))) -- (T, isoT)
747 vectDataConMapping datacon
748 = do { let name = dataConName datacon
749 ; vName <- lookupOrig mod (mkVectDataConOcc (nameOccName name))
750 ; let vDataCon = lookupDataCon vName
751 ; return (name, (datacon, vDataCon))
754 lookupVar name = case lookupTypeEnv typeEnv name of
755 Just (AnId var) -> var
757 panic "TcIface.tcIfaceVectInfo: not an id"
759 panic "TcIface.tcIfaceVectInfo: unknown name"
760 lookupTyCon name = case lookupTypeEnv typeEnv name of
761 Just (ATyCon tc) -> tc
763 panic "TcIface.tcIfaceVectInfo: not a tycon"
765 panic "TcIface.tcIfaceVectInfo: unknown name"
766 lookupDataCon name = case lookupTypeEnv typeEnv name of
767 Just (ADataCon dc) -> dc
769 panic "TcIface.tcIfaceVectInfo: not a datacon"
771 panic "TcIface.tcIfaceVectInfo: unknown name"
774 %************************************************************************
778 %************************************************************************
781 tcIfaceType :: IfaceType -> IfL Type
782 tcIfaceType (IfaceTyVar n) = do { tv <- tcIfaceTyVar n; return (TyVarTy tv) }
783 tcIfaceType (IfaceAppTy t1 t2) = do { t1' <- tcIfaceType t1; t2' <- tcIfaceType t2; return (AppTy t1' t2') }
784 tcIfaceType (IfaceFunTy t1 t2) = do { t1' <- tcIfaceType t1; t2' <- tcIfaceType t2; return (FunTy t1' t2') }
785 tcIfaceType (IfaceTyConApp tc ts) = do { tc' <- tcIfaceTyCon tc; ts' <- tcIfaceTypes ts; return (mkTyConApp tc' ts') }
786 tcIfaceType (IfaceForAllTy tv t) = bindIfaceTyVar tv $ \ tv' -> do { t' <- tcIfaceType t; return (ForAllTy tv' t') }
787 tcIfaceType (IfacePredTy st) = do { st' <- tcIfacePredType st; return (PredTy st') }
789 tcIfaceTypes :: [IfaceType] -> IfL [Type]
790 tcIfaceTypes tys = mapM tcIfaceType tys
792 -----------------------------------------
793 tcIfacePredType :: IfacePredType -> IfL PredType
794 tcIfacePredType (IfaceClassP cls ts) = do { cls' <- tcIfaceClass cls; ts' <- tcIfaceTypes ts; return (ClassP cls' ts') }
795 tcIfacePredType (IfaceIParam ip t) = do { ip' <- newIPName ip; t' <- tcIfaceType t; return (IParam ip' t') }
796 tcIfacePredType (IfaceEqPred t1 t2) = do { t1' <- tcIfaceType t1; t2' <- tcIfaceType t2; return (EqPred t1' t2') }
798 -----------------------------------------
799 tcIfaceCtxt :: IfaceContext -> IfL ThetaType
800 tcIfaceCtxt sts = mapM tcIfacePredType sts
804 %************************************************************************
808 %************************************************************************
811 tcIfaceExpr :: IfaceExpr -> IfL CoreExpr
812 tcIfaceExpr (IfaceType ty)
813 = Type <$> tcIfaceType ty
815 tcIfaceExpr (IfaceLcl name)
816 = Var <$> tcIfaceLclId name
818 tcIfaceExpr (IfaceTick modName tickNo)
819 = Var <$> tcIfaceTick modName tickNo
821 tcIfaceExpr (IfaceExt gbl)
822 = Var <$> tcIfaceExtId gbl
824 tcIfaceExpr (IfaceLit lit)
827 tcIfaceExpr (IfaceFCall cc ty) = do
828 ty' <- tcIfaceType ty
830 return (Var (mkFCallId u cc ty'))
832 tcIfaceExpr (IfaceTuple boxity args) = do
833 args' <- mapM tcIfaceExpr args
834 -- Put the missing type arguments back in
835 let con_args = map (Type . exprType) args' ++ args'
836 return (mkApps (Var con_id) con_args)
839 con_id = dataConWorkId (tupleCon boxity arity)
842 tcIfaceExpr (IfaceLam bndr body)
843 = bindIfaceBndr bndr $ \bndr' ->
844 Lam bndr' <$> tcIfaceExpr body
846 tcIfaceExpr (IfaceApp fun arg)
847 = App <$> tcIfaceExpr fun <*> tcIfaceExpr arg
849 tcIfaceExpr (IfaceCase scrut case_bndr ty alts) = do
850 scrut' <- tcIfaceExpr scrut
851 case_bndr_name <- newIfaceName (mkVarOccFS case_bndr)
853 scrut_ty = exprType scrut'
854 case_bndr' = mkLocalId case_bndr_name scrut_ty
855 tc_app = splitTyConApp scrut_ty
856 -- NB: Won't always succeed (polymoprhic case)
857 -- but won't be demanded in those cases
858 -- NB: not tcSplitTyConApp; we are looking at Core here
859 -- look through non-rec newtypes to find the tycon that
860 -- corresponds to the datacon in this case alternative
862 extendIfaceIdEnv [case_bndr'] $ do
863 alts' <- mapM (tcIfaceAlt scrut' tc_app) alts
864 ty' <- tcIfaceType ty
865 return (Case scrut' case_bndr' ty' alts')
867 tcIfaceExpr (IfaceLet (IfaceNonRec bndr rhs) body) = do
868 rhs' <- tcIfaceExpr rhs
869 id <- tcIfaceLetBndr bndr
870 body' <- extendIfaceIdEnv [id] (tcIfaceExpr body)
871 return (Let (NonRec id rhs') body')
873 tcIfaceExpr (IfaceLet (IfaceRec pairs) body) = do
874 ids <- mapM tcIfaceLetBndr bndrs
875 extendIfaceIdEnv ids $ do
876 rhss' <- mapM tcIfaceExpr rhss
877 body' <- tcIfaceExpr body
878 return (Let (Rec (ids `zip` rhss')) body')
880 (bndrs, rhss) = unzip pairs
882 tcIfaceExpr (IfaceCast expr co) = do
883 expr' <- tcIfaceExpr expr
884 co' <- tcIfaceType co
885 return (Cast expr' co')
887 tcIfaceExpr (IfaceNote note expr) = do
888 expr' <- tcIfaceExpr expr
890 IfaceInlineMe -> return (Note InlineMe expr')
891 IfaceSCC cc -> return (Note (SCC cc) expr')
892 IfaceCoreNote n -> return (Note (CoreNote n) expr')
894 -------------------------
895 tcIfaceAlt :: CoreExpr -> (TyCon, [Type])
896 -> (IfaceConAlt, [FastString], IfaceExpr)
897 -> IfL (AltCon, [TyVar], CoreExpr)
898 tcIfaceAlt _ _ (IfaceDefault, names, rhs)
899 = ASSERT( null names ) do
900 rhs' <- tcIfaceExpr rhs
901 return (DEFAULT, [], rhs')
903 tcIfaceAlt _ _ (IfaceLitAlt lit, names, rhs)
904 = ASSERT( null names ) do
905 rhs' <- tcIfaceExpr rhs
906 return (LitAlt lit, [], rhs')
908 -- A case alternative is made quite a bit more complicated
909 -- by the fact that we omit type annotations because we can
910 -- work them out. True enough, but its not that easy!
911 tcIfaceAlt scrut (tycon, inst_tys) (IfaceDataAlt data_occ, arg_strs, rhs)
912 = do { con <- tcIfaceDataCon data_occ
913 ; when (debugIsOn && not (con `elem` tyConDataCons tycon))
914 (failIfM (ppr scrut $$ ppr con $$ ppr tycon $$ ppr (tyConDataCons tycon)))
915 ; tcIfaceDataAlt con inst_tys arg_strs rhs }
917 tcIfaceAlt _ (tycon, inst_tys) (IfaceTupleAlt _boxity, arg_occs, rhs)
918 = ASSERT( isTupleTyCon tycon )
919 do { let [data_con] = tyConDataCons tycon
920 ; tcIfaceDataAlt data_con inst_tys arg_occs rhs }
922 tcIfaceDataAlt :: DataCon -> [Type] -> [FastString] -> IfaceExpr
923 -> IfL (AltCon, [TyVar], CoreExpr)
924 tcIfaceDataAlt con inst_tys arg_strs rhs
925 = do { us <- newUniqueSupply
926 ; let uniqs = uniqsFromSupply us
927 ; let (ex_tvs, co_tvs, arg_ids)
928 = dataConRepFSInstPat arg_strs uniqs con inst_tys
929 all_tvs = ex_tvs ++ co_tvs
931 ; rhs' <- extendIfaceTyVarEnv all_tvs $
932 extendIfaceIdEnv arg_ids $
934 ; return (DataAlt con, all_tvs ++ arg_ids, rhs') }
939 tcExtCoreBindings :: [IfaceBinding] -> IfL [CoreBind] -- Used for external core
940 tcExtCoreBindings [] = return []
941 tcExtCoreBindings (b:bs) = do_one b (tcExtCoreBindings bs)
943 do_one :: IfaceBinding -> IfL [CoreBind] -> IfL [CoreBind]
944 do_one (IfaceNonRec bndr rhs) thing_inside
945 = do { rhs' <- tcIfaceExpr rhs
946 ; bndr' <- newExtCoreBndr bndr
947 ; extendIfaceIdEnv [bndr'] $ do
948 { core_binds <- thing_inside
949 ; return (NonRec bndr' rhs' : core_binds) }}
951 do_one (IfaceRec pairs) thing_inside
952 = do { bndrs' <- mapM newExtCoreBndr bndrs
953 ; extendIfaceIdEnv bndrs' $ do
954 { rhss' <- mapM tcIfaceExpr rhss
955 ; core_binds <- thing_inside
956 ; return (Rec (bndrs' `zip` rhss') : core_binds) }}
958 (bndrs,rhss) = unzip pairs
962 %************************************************************************
966 %************************************************************************
969 tcIdDetails :: Type -> IfaceIdDetails -> IfL IdDetails
970 tcIdDetails _ IfVanillaId = return VanillaId
971 tcIdDetails _ IfDFunId = return DFunId
972 tcIdDetails ty (IfRecSelId naughty)
973 = return (RecSelId { sel_tycon = tc, sel_naughty = naughty })
975 (_, _, tau) = tcSplitSigmaTy ty
976 tc = tyConAppTyCon (funArgTy tau)
977 -- A bit fragile. Relies on the selector type looking like
978 -- forall abc. (stupid-context) => T a b c -> blah
980 tcIdInfo :: Bool -> Name -> Type -> IfaceIdInfo -> IfL IdInfo
981 tcIdInfo ignore_prags name ty info
982 | ignore_prags = return vanillaIdInfo
983 | otherwise = case info of
984 NoInfo -> return vanillaIdInfo
985 HasInfo info -> foldlM tcPrag init_info info
987 -- Set the CgInfo to something sensible but uninformative before
988 -- we start; default assumption is that it has CAFs
989 init_info = vanillaIdInfo
991 tcPrag :: IdInfo -> IfaceInfoItem -> IfL IdInfo
992 tcPrag info HsNoCafRefs = return (info `setCafInfo` NoCafRefs)
993 tcPrag info (HsArity arity) = return (info `setArityInfo` arity)
994 tcPrag info (HsStrictness str) = return (info `setAllStrictnessInfo` Just str)
996 -- The next two are lazy, so they don't transitively suck stuff in
997 tcPrag info (HsWorker nm arity) = tcWorkerInfo ty info nm arity
998 tcPrag info (HsInline inline_prag) = return (info `setInlinePragInfo` inline_prag)
999 tcPrag info (HsUnfold expr) = do
1000 maybe_expr' <- tcPragExpr name expr
1002 -- maybe_expr' doesn't get looked at if the unfolding
1003 -- is never inspected; so the typecheck doesn't even happen
1004 unfold_info = case maybe_expr' of
1005 Nothing -> noUnfolding
1006 Just expr' -> mkTopUnfolding expr'
1007 return (info `setUnfoldingInfoLazily` unfold_info)
1011 tcWorkerInfo :: Type -> IdInfo -> Name -> Arity -> IfL IdInfo
1012 tcWorkerInfo ty info wkr arity
1013 = do { mb_wkr_id <- forkM_maybe doc (tcIfaceExtId wkr)
1015 -- We return without testing maybe_wkr_id, but as soon as info is
1016 -- looked at we will test it. That's ok, because its outside the
1017 -- knot; and there seems no big reason to further defer the
1018 -- tcIfaceId lookup. (Contrast with tcPragExpr, where postponing walking
1019 -- over the unfolding until it's actually used does seem worth while.)
1020 ; us <- newUniqueSupply
1022 ; return (case mb_wkr_id of
1024 Just wkr_id -> add_wkr_info us wkr_id info) }
1026 doc = text "Worker for" <+> ppr wkr
1027 add_wkr_info us wkr_id info
1028 = info `setUnfoldingInfoLazily` mk_unfolding us wkr_id
1029 `setWorkerInfo` HasWorker wkr_id arity
1031 mk_unfolding us wkr_id = mkTopUnfolding (initUs_ us (mkWrapper ty strict_sig) wkr_id)
1033 -- We are relying here on strictness info always appearing
1034 -- before worker info, fingers crossed ....
1035 strict_sig = case newStrictnessInfo info of
1037 Nothing -> pprPanic "Worker info but no strictness for" (ppr wkr)
1040 For unfoldings we try to do the job lazily, so that we never type check
1041 an unfolding that isn't going to be looked at.
1044 tcPragExpr :: Name -> IfaceExpr -> IfL (Maybe CoreExpr)
1045 tcPragExpr name expr
1046 = forkM_maybe doc $ do
1047 core_expr' <- tcIfaceExpr expr
1049 -- Check for type consistency in the unfolding
1050 ifOptM Opt_DoCoreLinting $ do
1051 in_scope <- get_in_scope_ids
1052 case lintUnfolding noSrcLoc in_scope core_expr' of
1053 Nothing -> return ()
1054 Just fail_msg -> pprPanic "Iface Lint failure" (hang doc 2 fail_msg)
1058 doc = text "Unfolding of" <+> ppr name
1059 get_in_scope_ids -- Urgh; but just for linting
1061 do { env <- getGblEnv
1062 ; case if_rec_types env of {
1063 Nothing -> return [] ;
1064 Just (_, get_env) -> do
1065 { type_env <- get_env
1066 ; return (typeEnvIds type_env) }}}
1071 %************************************************************************
1073 Getting from Names to TyThings
1075 %************************************************************************
1078 tcIfaceGlobal :: Name -> IfL TyThing
1080 | Just thing <- wiredInNameTyThing_maybe name
1081 -- Wired-in things include TyCons, DataCons, and Ids
1082 = do { ifCheckWiredInThing thing; return thing }
1084 = do { env <- getGblEnv
1085 ; case if_rec_types env of { -- Note [Tying the knot]
1086 Just (mod, get_type_env)
1087 | nameIsLocalOrFrom mod name
1088 -> do -- It's defined in the module being compiled
1089 { type_env <- setLclEnv () get_type_env -- yuk
1090 ; case lookupNameEnv type_env name of
1091 Just thing -> return thing
1092 Nothing -> pprPanic "tcIfaceGlobal (local): not found:"
1093 (ppr name $$ ppr type_env) }
1097 { hsc_env <- getTopEnv
1098 ; mb_thing <- liftIO (lookupTypeHscEnv hsc_env name)
1099 ; case mb_thing of {
1100 Just thing -> return thing ;
1103 { mb_thing <- importDecl name -- It's imported; go get it
1105 Failed err -> failIfM err
1106 Succeeded thing -> return thing
1109 -- Note [Tying the knot]
1110 -- ~~~~~~~~~~~~~~~~~~~~~
1111 -- The if_rec_types field is used in two situations:
1113 -- a) Compiling M.hs, which indiretly imports Foo.hi, which mentions M.T
1114 -- Then we look up M.T in M's type environment, which is splatted into if_rec_types
1115 -- after we've built M's type envt.
1117 -- b) In ghc --make, during the upsweep, we encounter M.hs, whose interface M.hi
1118 -- is up to date. So we call typecheckIface on M.hi. This splats M.T into
1119 -- if_rec_types so that the (lazily typechecked) decls see all the other decls
1121 -- In case (b) it's important to do the if_rec_types check *before* looking in the HPT
1122 -- Because if M.hs also has M.hs-boot, M.T will *already be* in the HPT, but in its
1123 -- emasculated form (e.g. lacking data constructors).
1125 tcIfaceTyCon :: IfaceTyCon -> IfL TyCon
1126 tcIfaceTyCon IfaceIntTc = tcWiredInTyCon intTyCon
1127 tcIfaceTyCon IfaceBoolTc = tcWiredInTyCon boolTyCon
1128 tcIfaceTyCon IfaceCharTc = tcWiredInTyCon charTyCon
1129 tcIfaceTyCon IfaceListTc = tcWiredInTyCon listTyCon
1130 tcIfaceTyCon IfacePArrTc = tcWiredInTyCon parrTyCon
1131 tcIfaceTyCon (IfaceTupTc bx ar) = tcWiredInTyCon (tupleTyCon bx ar)
1132 tcIfaceTyCon (IfaceTc name) = do { thing <- tcIfaceGlobal name
1133 ; return (check_tc (tyThingTyCon thing)) }
1136 | debugIsOn = case toIfaceTyCon tc of
1138 _ -> pprTrace "check_tc" (ppr tc) tc
1140 -- we should be okay just returning Kind constructors without extra loading
1141 tcIfaceTyCon IfaceLiftedTypeKindTc = return liftedTypeKindTyCon
1142 tcIfaceTyCon IfaceOpenTypeKindTc = return openTypeKindTyCon
1143 tcIfaceTyCon IfaceUnliftedTypeKindTc = return unliftedTypeKindTyCon
1144 tcIfaceTyCon IfaceArgTypeKindTc = return argTypeKindTyCon
1145 tcIfaceTyCon IfaceUbxTupleKindTc = return ubxTupleKindTyCon
1147 -- Even though we are in an interface file, we want to make
1148 -- sure the instances and RULES of this tycon are loaded
1149 -- Imagine: f :: Double -> Double
1150 tcWiredInTyCon :: TyCon -> IfL TyCon
1151 tcWiredInTyCon tc = do { ifCheckWiredInThing (ATyCon tc)
1154 tcIfaceClass :: Name -> IfL Class
1155 tcIfaceClass name = do { thing <- tcIfaceGlobal name
1156 ; return (tyThingClass thing) }
1158 tcIfaceDataCon :: Name -> IfL DataCon
1159 tcIfaceDataCon name = do { thing <- tcIfaceGlobal name
1161 ADataCon dc -> return dc
1162 _ -> pprPanic "tcIfaceExtDC" (ppr name$$ ppr thing) }
1164 tcIfaceExtId :: Name -> IfL Id
1165 tcIfaceExtId name = do { thing <- tcIfaceGlobal name
1167 AnId id -> return id
1168 _ -> pprPanic "tcIfaceExtId" (ppr name$$ ppr thing) }
1171 %************************************************************************
1175 %************************************************************************
1178 bindIfaceBndr :: IfaceBndr -> (CoreBndr -> IfL a) -> IfL a
1179 bindIfaceBndr (IfaceIdBndr (fs, ty)) thing_inside
1180 = do { name <- newIfaceName (mkVarOccFS fs)
1181 ; ty' <- tcIfaceType ty
1182 ; let id = mkLocalId name ty'
1183 ; extendIfaceIdEnv [id] (thing_inside id) }
1184 bindIfaceBndr (IfaceTvBndr bndr) thing_inside
1185 = bindIfaceTyVar bndr thing_inside
1187 bindIfaceBndrs :: [IfaceBndr] -> ([CoreBndr] -> IfL a) -> IfL a
1188 bindIfaceBndrs [] thing_inside = thing_inside []
1189 bindIfaceBndrs (b:bs) thing_inside
1190 = bindIfaceBndr b $ \ b' ->
1191 bindIfaceBndrs bs $ \ bs' ->
1192 thing_inside (b':bs')
1195 -----------------------
1196 tcIfaceLetBndr :: IfaceLetBndr -> IfL Id
1197 tcIfaceLetBndr (IfLetBndr fs ty info)
1198 = do { name <- newIfaceName (mkVarOccFS fs)
1199 ; ty' <- tcIfaceType ty
1201 NoInfo -> return (mkLocalId name ty')
1202 HasInfo i -> return (mkLocalIdWithInfo name ty' (tc_info i)) }
1204 -- Similar to tcIdInfo, but much simpler
1205 tc_info [] = vanillaIdInfo
1206 tc_info (HsInline p : i) = tc_info i `setInlinePragInfo` p
1207 tc_info (HsArity a : i) = tc_info i `setArityInfo` a
1208 tc_info (HsStrictness s : i) = tc_info i `setAllStrictnessInfo` Just s
1209 tc_info (other : i) = pprTrace "tcIfaceLetBndr: discarding unexpected IdInfo"
1210 (ppr other) (tc_info i)
1212 -----------------------
1213 newExtCoreBndr :: IfaceLetBndr -> IfL Id
1214 newExtCoreBndr (IfLetBndr var ty _) -- Ignoring IdInfo for now
1215 = do { mod <- getIfModule
1216 ; name <- newGlobalBinder mod (mkVarOccFS var) noSrcSpan
1217 ; ty' <- tcIfaceType ty
1218 ; return (mkLocalId name ty') }
1220 -----------------------
1221 bindIfaceTyVar :: IfaceTvBndr -> (TyVar -> IfL a) -> IfL a
1222 bindIfaceTyVar (occ,kind) thing_inside
1223 = do { name <- newIfaceName (mkTyVarOccFS occ)
1224 ; tyvar <- mk_iface_tyvar name kind
1225 ; extendIfaceTyVarEnv [tyvar] (thing_inside tyvar) }
1227 bindIfaceTyVars :: [IfaceTvBndr] -> ([TyVar] -> IfL a) -> IfL a
1228 bindIfaceTyVars bndrs thing_inside
1229 = do { names <- newIfaceNames (map mkTyVarOccFS occs)
1230 ; tyvars <- zipWithM mk_iface_tyvar names kinds
1231 ; extendIfaceTyVarEnv tyvars (thing_inside tyvars) }
1233 (occs,kinds) = unzip bndrs
1235 mk_iface_tyvar :: Name -> IfaceKind -> IfL TyVar
1236 mk_iface_tyvar name ifKind
1237 = do { kind <- tcIfaceType ifKind
1238 ; if isCoercionKind kind then
1239 return (Var.mkCoVar name kind)
1241 return (Var.mkTyVar name kind) }
1243 bindIfaceTyVars_AT :: [IfaceTvBndr] -> ([TyVar] -> IfL a) -> IfL a
1244 -- Used for type variable in nested associated data/type declarations
1245 -- where some of the type variables are already in scope
1246 -- class C a where { data T a b }
1247 -- Here 'a' is in scope when we look at the 'data T'
1248 bindIfaceTyVars_AT [] thing_inside
1250 bindIfaceTyVars_AT (b@(tv_occ,_) : bs) thing_inside
1251 = bindIfaceTyVars_AT bs $ \ bs' ->
1252 do { mb_tv <- lookupIfaceTyVar tv_occ
1254 Just b' -> thing_inside (b':bs')
1255 Nothing -> bindIfaceTyVar b $ \ b' ->
1256 thing_inside (b':bs') }