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 = do { tc_name <- lookupIfaceTop occ_name
433 ; bindIfaceTyVars tv_bndrs $ \ tyvars -> do
435 { tycon <- fixM ( \ tycon -> do
436 { stupid_theta <- tcIfaceCtxt ctxt
439 Nothing -> return Nothing
441 do { famTyCon <- tcIfaceTyCon fam
442 ; insttys <- mapM tcIfaceType tys
443 ; return $ Just (famTyCon, insttys)
445 ; cons <- tcIfaceDataCons tc_name tycon tyvars rdr_cons
446 ; buildAlgTyCon tc_name tyvars stupid_theta
447 cons is_rec want_generic gadt_syn famInst
449 ; traceIf (text "tcIfaceDecl4" <+> ppr tycon)
450 ; return (ATyCon tycon)
453 tcIfaceDecl _ (IfaceSyn {ifName = occ_name, ifTyVars = tv_bndrs,
454 ifSynRhs = mb_rhs_ty,
455 ifSynKind = kind, ifFamInst = mb_family})
456 = bindIfaceTyVars tv_bndrs $ \ tyvars -> do
457 { tc_name <- lookupIfaceTop occ_name
458 ; rhs_kind <- tcIfaceType kind -- Note [Synonym kind loop]
459 ; ~(rhs, fam) <- forkM (mk_doc tc_name) $
460 do { rhs <- tc_syn_rhs rhs_kind mb_rhs_ty
461 ; fam <- tc_syn_fam mb_family
462 ; return (rhs, fam) }
463 ; tycon <- buildSynTyCon tc_name tyvars rhs rhs_kind fam
464 ; return $ ATyCon tycon
467 mk_doc n = ptext (sLit "Type syonym") <+> ppr n
468 tc_syn_rhs kind Nothing = return (OpenSynTyCon kind Nothing)
469 tc_syn_rhs _ (Just ty) = do { rhs_ty <- tcIfaceType ty
470 ; return (SynonymTyCon rhs_ty) }
473 tc_syn_fam (Just (fam, tys))
474 = do { famTyCon <- tcIfaceTyCon fam
475 ; insttys <- mapM tcIfaceType tys
476 ; return $ Just (famTyCon, insttys) }
478 tcIfaceDecl ignore_prags
479 (IfaceClass {ifCtxt = rdr_ctxt, ifName = occ_name,
480 ifTyVars = tv_bndrs, ifFDs = rdr_fds,
481 ifATs = rdr_ats, ifSigs = rdr_sigs,
483 -- ToDo: in hs-boot files we should really treat abstract classes specially,
484 -- as we do abstract tycons
485 = bindIfaceTyVars tv_bndrs $ \ tyvars -> do
486 { cls_name <- lookupIfaceTop occ_name
487 ; ctxt <- tcIfaceCtxt rdr_ctxt
488 ; sigs <- mapM tc_sig rdr_sigs
489 ; fds <- mapM tc_fd rdr_fds
490 ; ats' <- mapM (tcIfaceDecl ignore_prags) rdr_ats
491 ; let ats = map (setAssocFamilyPermutation tyvars) ats'
492 ; cls <- buildClass ignore_prags cls_name tyvars ctxt fds ats sigs tc_isrec
493 ; return (AClass cls) }
495 tc_sig (IfaceClassOp occ dm rdr_ty)
496 = do { op_name <- lookupIfaceTop occ
497 ; op_ty <- forkM (mk_doc op_name rdr_ty) (tcIfaceType rdr_ty)
498 -- Must be done lazily for just the same reason as the
499 -- type of a data con; to avoid sucking in types that
500 -- it mentions unless it's necessray to do so
501 ; return (op_name, dm, op_ty) }
503 mk_doc op_name op_ty = ptext (sLit "Class op") <+> sep [ppr op_name, ppr op_ty]
505 tc_fd (tvs1, tvs2) = do { tvs1' <- mapM tcIfaceTyVar tvs1
506 ; tvs2' <- mapM tcIfaceTyVar tvs2
507 ; return (tvs1', tvs2') }
509 tcIfaceDecl _ (IfaceForeign {ifName = rdr_name, ifExtName = ext_name})
510 = do { name <- lookupIfaceTop rdr_name
511 ; return (ATyCon (mkForeignTyCon name ext_name
514 tcIfaceDataCons :: Name -> TyCon -> [TyVar] -> IfaceConDecls -> IfL AlgTyConRhs
515 tcIfaceDataCons tycon_name tycon _ if_cons
517 IfAbstractTyCon -> return mkAbstractTyConRhs
518 IfOpenDataTyCon -> return mkOpenDataTyConRhs
519 IfDataTyCon cons -> do { data_cons <- mapM tc_con_decl cons
520 ; return (mkDataTyConRhs data_cons) }
521 IfNewTyCon con -> do { data_con <- tc_con_decl con
522 ; mkNewTyConRhs tycon_name tycon data_con }
524 tc_con_decl (IfCon { ifConInfix = is_infix,
525 ifConUnivTvs = univ_tvs, ifConExTvs = ex_tvs,
526 ifConOcc = occ, ifConCtxt = ctxt, ifConEqSpec = spec,
527 ifConArgTys = args, ifConFields = field_lbls,
528 ifConStricts = stricts})
529 = bindIfaceTyVars univ_tvs $ \ univ_tyvars -> do
530 bindIfaceTyVars ex_tvs $ \ ex_tyvars -> do
531 { name <- lookupIfaceTop occ
532 ; eq_spec <- tcIfaceEqSpec spec
533 ; theta <- tcIfaceCtxt ctxt -- Laziness seems not worth the bother here
534 -- At one stage I thought that this context checking *had*
535 -- to be lazy, because of possible mutual recursion between the
536 -- type and the classe:
538 -- class Real a where { toRat :: a -> Ratio Integer }
539 -- data (Real a) => Ratio a = ...
540 -- But now I think that the laziness in checking class ops breaks
541 -- the loop, so no laziness needed
543 -- Read the argument types, but lazily to avoid faulting in
544 -- the component types unless they are really needed
545 ; arg_tys <- forkM (mk_doc name) (mapM tcIfaceType args)
546 ; lbl_names <- mapM lookupIfaceTop field_lbls
548 -- Remember, tycon is the representation tycon
549 ; let orig_res_ty = mkFamilyTyConApp tycon
550 (substTyVars (mkTopTvSubst eq_spec) univ_tyvars)
552 ; buildDataCon name is_infix {- Not infix -}
554 univ_tyvars ex_tyvars
556 arg_tys orig_res_ty tycon
558 mk_doc con_name = ptext (sLit "Constructor") <+> ppr con_name
560 tcIfaceEqSpec :: [(OccName, IfaceType)] -> IfL [(TyVar, Type)]
564 do_item (occ, if_ty) = do { tv <- tcIfaceTyVar (occNameFS occ)
565 ; ty <- tcIfaceType if_ty
569 Note [Synonym kind loop]
570 ~~~~~~~~~~~~~~~~~~~~~~~~
571 Notice that we eagerly grab the *kind* from the interface file, but
572 build a forkM thunk for the *rhs* (and family stuff). To see why,
573 consider this (Trac #2412)
575 M.hs: module M where { import X; data T = MkT S }
576 X.hs: module X where { import {-# SOURCE #-} M; type S = T }
577 M.hs-boot: module M where { data T }
579 When kind-checking M.hs we need S's kind. But we do not want to
580 find S's kind from (typeKind S-rhs), because we don't want to look at
581 S-rhs yet! Since S is imported from X.hi, S gets just one chance to
582 be defined, and we must not do that until we've finished with M.T.
584 Solution: record S's kind in the interface file; now we can safely
587 %************************************************************************
591 %************************************************************************
594 tcIfaceInst :: IfaceInst -> IfL Instance
595 tcIfaceInst (IfaceInst { ifDFun = dfun_occ, ifOFlag = oflag,
596 ifInstCls = cls, ifInstTys = mb_tcs })
597 = do { dfun <- forkM (ptext (sLit "Dict fun") <+> ppr dfun_occ) $
598 tcIfaceExtId dfun_occ
599 ; let mb_tcs' = map (fmap ifaceTyConName) mb_tcs
600 ; return (mkImportedInstance cls mb_tcs' dfun oflag) }
602 tcIfaceFamInst :: IfaceFamInst -> IfL FamInst
603 tcIfaceFamInst (IfaceFamInst { ifFamInstTyCon = tycon,
604 ifFamInstFam = fam, ifFamInstTys = mb_tcs })
605 -- { tycon' <- forkM (ptext (sLit "Inst tycon") <+> ppr tycon) $
606 -- the above line doesn't work, but this below does => CPP in Haskell = evil!
607 = do tycon' <- forkM (text ("Inst tycon") <+> ppr tycon) $
609 let mb_tcs' = map (fmap ifaceTyConName) mb_tcs
610 return (mkImportedFamInst fam mb_tcs' tycon')
614 %************************************************************************
618 %************************************************************************
620 We move a IfaceRule from eps_rules to eps_rule_base when all its LHS free vars
621 are in the type environment. However, remember that typechecking a Rule may
622 (as a side effect) augment the type envt, and so we may need to iterate the process.
625 tcIfaceRules :: Bool -- True <=> ignore rules
628 tcIfaceRules ignore_prags if_rules
629 | ignore_prags = return []
630 | otherwise = mapM tcIfaceRule if_rules
632 tcIfaceRule :: IfaceRule -> IfL CoreRule
633 tcIfaceRule (IfaceRule {ifRuleName = name, ifActivation = act, ifRuleBndrs = bndrs,
634 ifRuleHead = fn, ifRuleArgs = args, ifRuleRhs = rhs })
635 = do { ~(bndrs', args', rhs') <-
636 -- Typecheck the payload lazily, in the hope it'll never be looked at
637 forkM (ptext (sLit "Rule") <+> ftext name) $
638 bindIfaceBndrs bndrs $ \ bndrs' ->
639 do { args' <- mapM tcIfaceExpr args
640 ; rhs' <- tcIfaceExpr rhs
641 ; return (bndrs', args', rhs') }
642 ; let mb_tcs = map ifTopFreeName args
643 ; return (Rule { ru_name = name, ru_fn = fn, ru_act = act,
644 ru_bndrs = bndrs', ru_args = args',
647 ru_local = False }) } -- An imported RULE is never for a local Id
648 -- or, even if it is (module loop, perhaps)
649 -- we'll just leave it in the non-local set
651 -- This function *must* mirror exactly what Rules.topFreeName does
652 -- We could have stored the ru_rough field in the iface file
653 -- but that would be redundant, I think.
654 -- The only wrinkle is that we must not be deceived by
655 -- type syononyms at the top of a type arg. Since
656 -- we can't tell at this point, we are careful not
657 -- to write them out in coreRuleToIfaceRule
658 ifTopFreeName :: IfaceExpr -> Maybe Name
659 ifTopFreeName (IfaceType (IfaceTyConApp tc _ )) = Just (ifaceTyConName tc)
660 ifTopFreeName (IfaceApp f _) = ifTopFreeName f
661 ifTopFreeName (IfaceExt n) = Just n
662 ifTopFreeName _ = Nothing
666 %************************************************************************
670 %************************************************************************
673 tcIfaceAnnotations :: [IfaceAnnotation] -> IfL [Annotation]
674 tcIfaceAnnotations = mapM tcIfaceAnnotation
676 tcIfaceAnnotation :: IfaceAnnotation -> IfL Annotation
677 tcIfaceAnnotation (IfaceAnnotation target serialized) = do
678 target' <- tcIfaceAnnTarget target
679 return $ Annotation {
680 ann_target = target',
681 ann_value = serialized
684 tcIfaceAnnTarget :: IfaceAnnTarget -> IfL (AnnTarget Name)
685 tcIfaceAnnTarget (NamedTarget occ) = do
686 name <- lookupIfaceTop occ
687 return $ NamedTarget name
688 tcIfaceAnnTarget (ModuleTarget mod) = do
689 return $ ModuleTarget mod
694 %************************************************************************
696 Vectorisation information
698 %************************************************************************
701 tcIfaceVectInfo :: Module -> TypeEnv -> IfaceVectInfo -> IfL VectInfo
702 tcIfaceVectInfo mod typeEnv (IfaceVectInfo
703 { ifaceVectInfoVar = vars
704 , ifaceVectInfoTyCon = tycons
705 , ifaceVectInfoTyConReuse = tyconsReuse
707 = do { vVars <- mapM vectVarMapping vars
708 ; tyConRes1 <- mapM vectTyConMapping tycons
709 ; tyConRes2 <- mapM vectTyConReuseMapping tyconsReuse
710 ; let (vTyCons, vDataCons, vPAs, vIsos) = unzip4 (tyConRes1 ++ tyConRes2)
712 { vectInfoVar = mkVarEnv vVars
713 , vectInfoTyCon = mkNameEnv vTyCons
714 , vectInfoDataCon = mkNameEnv (concat vDataCons)
715 , vectInfoPADFun = mkNameEnv vPAs
716 , vectInfoIso = mkNameEnv vIsos
721 = do { vName <- lookupOrig mod (mkVectOcc (nameOccName name))
722 ; let { var = lookupVar name
723 ; vVar = lookupVar vName
725 ; return (var, (var, vVar))
727 vectTyConMapping name
728 = do { vName <- lookupOrig mod (mkVectTyConOcc (nameOccName name))
729 ; paName <- lookupOrig mod (mkPADFunOcc (nameOccName name))
730 ; isoName <- lookupOrig mod (mkVectIsoOcc (nameOccName name))
731 ; let { tycon = lookupTyCon name
732 ; vTycon = lookupTyCon vName
733 ; paTycon = lookupVar paName
734 ; isoTycon = lookupVar isoName
736 ; vDataCons <- mapM vectDataConMapping (tyConDataCons tycon)
737 ; return ((name, (tycon, vTycon)), -- (T, T_v)
738 vDataCons, -- list of (Ci, Ci_v)
739 (vName, (vTycon, paTycon)), -- (T_v, paT)
740 (name, (tycon, isoTycon))) -- (T, isoT)
742 vectTyConReuseMapping name
743 = do { paName <- lookupOrig mod (mkPADFunOcc (nameOccName name))
744 ; isoName <- lookupOrig mod (mkVectIsoOcc (nameOccName name))
745 ; let { tycon = lookupTyCon name
746 ; paTycon = lookupVar paName
747 ; isoTycon = lookupVar isoName
748 ; vDataCons = [ (dataConName dc, (dc, dc))
749 | dc <- tyConDataCons tycon]
751 ; return ((name, (tycon, tycon)), -- (T, T)
752 vDataCons, -- list of (Ci, Ci)
753 (name, (tycon, paTycon)), -- (T, paT)
754 (name, (tycon, isoTycon))) -- (T, isoT)
756 vectDataConMapping datacon
757 = do { let name = dataConName datacon
758 ; vName <- lookupOrig mod (mkVectDataConOcc (nameOccName name))
759 ; let vDataCon = lookupDataCon vName
760 ; return (name, (datacon, vDataCon))
763 lookupVar name = case lookupTypeEnv typeEnv name of
764 Just (AnId var) -> var
766 panic "TcIface.tcIfaceVectInfo: not an id"
768 panic "TcIface.tcIfaceVectInfo: unknown name"
769 lookupTyCon name = case lookupTypeEnv typeEnv name of
770 Just (ATyCon tc) -> tc
772 panic "TcIface.tcIfaceVectInfo: not a tycon"
774 panic "TcIface.tcIfaceVectInfo: unknown name"
775 lookupDataCon name = case lookupTypeEnv typeEnv name of
776 Just (ADataCon dc) -> dc
778 panic "TcIface.tcIfaceVectInfo: not a datacon"
780 panic "TcIface.tcIfaceVectInfo: unknown name"
783 %************************************************************************
787 %************************************************************************
790 tcIfaceType :: IfaceType -> IfL Type
791 tcIfaceType (IfaceTyVar n) = do { tv <- tcIfaceTyVar n; return (TyVarTy tv) }
792 tcIfaceType (IfaceAppTy t1 t2) = do { t1' <- tcIfaceType t1; t2' <- tcIfaceType t2; return (AppTy t1' t2') }
793 tcIfaceType (IfaceFunTy t1 t2) = do { t1' <- tcIfaceType t1; t2' <- tcIfaceType t2; return (FunTy t1' t2') }
794 tcIfaceType (IfaceTyConApp tc ts) = do { tc' <- tcIfaceTyCon tc; ts' <- tcIfaceTypes ts; return (mkTyConApp tc' ts') }
795 tcIfaceType (IfaceForAllTy tv t) = bindIfaceTyVar tv $ \ tv' -> do { t' <- tcIfaceType t; return (ForAllTy tv' t') }
796 tcIfaceType (IfacePredTy st) = do { st' <- tcIfacePredType st; return (PredTy st') }
798 tcIfaceTypes :: [IfaceType] -> IfL [Type]
799 tcIfaceTypes tys = mapM tcIfaceType tys
801 -----------------------------------------
802 tcIfacePredType :: IfacePredType -> IfL PredType
803 tcIfacePredType (IfaceClassP cls ts) = do { cls' <- tcIfaceClass cls; ts' <- tcIfaceTypes ts; return (ClassP cls' ts') }
804 tcIfacePredType (IfaceIParam ip t) = do { ip' <- newIPName ip; t' <- tcIfaceType t; return (IParam ip' t') }
805 tcIfacePredType (IfaceEqPred t1 t2) = do { t1' <- tcIfaceType t1; t2' <- tcIfaceType t2; return (EqPred t1' t2') }
807 -----------------------------------------
808 tcIfaceCtxt :: IfaceContext -> IfL ThetaType
809 tcIfaceCtxt sts = mapM tcIfacePredType sts
813 %************************************************************************
817 %************************************************************************
820 tcIfaceExpr :: IfaceExpr -> IfL CoreExpr
821 tcIfaceExpr (IfaceType ty)
822 = Type <$> tcIfaceType ty
824 tcIfaceExpr (IfaceLcl name)
825 = Var <$> tcIfaceLclId name
827 tcIfaceExpr (IfaceTick modName tickNo)
828 = Var <$> tcIfaceTick modName tickNo
830 tcIfaceExpr (IfaceExt gbl)
831 = Var <$> tcIfaceExtId gbl
833 tcIfaceExpr (IfaceLit lit)
836 tcIfaceExpr (IfaceFCall cc ty) = do
837 ty' <- tcIfaceType ty
839 return (Var (mkFCallId u cc ty'))
841 tcIfaceExpr (IfaceTuple boxity args) = do
842 args' <- mapM tcIfaceExpr args
843 -- Put the missing type arguments back in
844 let con_args = map (Type . exprType) args' ++ args'
845 return (mkApps (Var con_id) con_args)
848 con_id = dataConWorkId (tupleCon boxity arity)
851 tcIfaceExpr (IfaceLam bndr body)
852 = bindIfaceBndr bndr $ \bndr' ->
853 Lam bndr' <$> tcIfaceExpr body
855 tcIfaceExpr (IfaceApp fun arg)
856 = App <$> tcIfaceExpr fun <*> tcIfaceExpr arg
858 tcIfaceExpr (IfaceCase scrut case_bndr ty alts) = do
859 scrut' <- tcIfaceExpr scrut
860 case_bndr_name <- newIfaceName (mkVarOccFS case_bndr)
862 scrut_ty = exprType scrut'
863 case_bndr' = mkLocalId case_bndr_name scrut_ty
864 tc_app = splitTyConApp scrut_ty
865 -- NB: Won't always succeed (polymoprhic case)
866 -- but won't be demanded in those cases
867 -- NB: not tcSplitTyConApp; we are looking at Core here
868 -- look through non-rec newtypes to find the tycon that
869 -- corresponds to the datacon in this case alternative
871 extendIfaceIdEnv [case_bndr'] $ do
872 alts' <- mapM (tcIfaceAlt scrut' tc_app) alts
873 ty' <- tcIfaceType ty
874 return (Case scrut' case_bndr' ty' alts')
876 tcIfaceExpr (IfaceLet (IfaceNonRec bndr rhs) body) = do
877 rhs' <- tcIfaceExpr rhs
878 id <- tcIfaceLetBndr bndr
879 body' <- extendIfaceIdEnv [id] (tcIfaceExpr body)
880 return (Let (NonRec id rhs') body')
882 tcIfaceExpr (IfaceLet (IfaceRec pairs) body) = do
883 ids <- mapM tcIfaceLetBndr bndrs
884 extendIfaceIdEnv ids $ do
885 rhss' <- mapM tcIfaceExpr rhss
886 body' <- tcIfaceExpr body
887 return (Let (Rec (ids `zip` rhss')) body')
889 (bndrs, rhss) = unzip pairs
891 tcIfaceExpr (IfaceCast expr co) = do
892 expr' <- tcIfaceExpr expr
893 co' <- tcIfaceType co
894 return (Cast expr' co')
896 tcIfaceExpr (IfaceNote note expr) = do
897 expr' <- tcIfaceExpr expr
899 IfaceInlineMe -> return (Note InlineMe expr')
900 IfaceSCC cc -> return (Note (SCC cc) expr')
901 IfaceCoreNote n -> return (Note (CoreNote n) expr')
903 -------------------------
904 tcIfaceAlt :: CoreExpr -> (TyCon, [Type])
905 -> (IfaceConAlt, [FastString], IfaceExpr)
906 -> IfL (AltCon, [TyVar], CoreExpr)
907 tcIfaceAlt _ _ (IfaceDefault, names, rhs)
908 = ASSERT( null names ) do
909 rhs' <- tcIfaceExpr rhs
910 return (DEFAULT, [], rhs')
912 tcIfaceAlt _ _ (IfaceLitAlt lit, names, rhs)
913 = ASSERT( null names ) do
914 rhs' <- tcIfaceExpr rhs
915 return (LitAlt lit, [], rhs')
917 -- A case alternative is made quite a bit more complicated
918 -- by the fact that we omit type annotations because we can
919 -- work them out. True enough, but its not that easy!
920 tcIfaceAlt scrut (tycon, inst_tys) (IfaceDataAlt data_occ, arg_strs, rhs)
921 = do { con <- tcIfaceDataCon data_occ
922 ; when (debugIsOn && not (con `elem` tyConDataCons tycon))
923 (failIfM (ppr scrut $$ ppr con $$ ppr tycon $$ ppr (tyConDataCons tycon)))
924 ; tcIfaceDataAlt con inst_tys arg_strs rhs }
926 tcIfaceAlt _ (tycon, inst_tys) (IfaceTupleAlt _boxity, arg_occs, rhs)
927 = ASSERT( isTupleTyCon tycon )
928 do { let [data_con] = tyConDataCons tycon
929 ; tcIfaceDataAlt data_con inst_tys arg_occs rhs }
931 tcIfaceDataAlt :: DataCon -> [Type] -> [FastString] -> IfaceExpr
932 -> IfL (AltCon, [TyVar], CoreExpr)
933 tcIfaceDataAlt con inst_tys arg_strs rhs
934 = do { us <- newUniqueSupply
935 ; let uniqs = uniqsFromSupply us
936 ; let (ex_tvs, co_tvs, arg_ids)
937 = dataConRepFSInstPat arg_strs uniqs con inst_tys
938 all_tvs = ex_tvs ++ co_tvs
940 ; rhs' <- extendIfaceTyVarEnv all_tvs $
941 extendIfaceIdEnv arg_ids $
943 ; return (DataAlt con, all_tvs ++ arg_ids, rhs') }
948 tcExtCoreBindings :: [IfaceBinding] -> IfL [CoreBind] -- Used for external core
949 tcExtCoreBindings [] = return []
950 tcExtCoreBindings (b:bs) = do_one b (tcExtCoreBindings bs)
952 do_one :: IfaceBinding -> IfL [CoreBind] -> IfL [CoreBind]
953 do_one (IfaceNonRec bndr rhs) thing_inside
954 = do { rhs' <- tcIfaceExpr rhs
955 ; bndr' <- newExtCoreBndr bndr
956 ; extendIfaceIdEnv [bndr'] $ do
957 { core_binds <- thing_inside
958 ; return (NonRec bndr' rhs' : core_binds) }}
960 do_one (IfaceRec pairs) thing_inside
961 = do { bndrs' <- mapM newExtCoreBndr bndrs
962 ; extendIfaceIdEnv bndrs' $ do
963 { rhss' <- mapM tcIfaceExpr rhss
964 ; core_binds <- thing_inside
965 ; return (Rec (bndrs' `zip` rhss') : core_binds) }}
967 (bndrs,rhss) = unzip pairs
971 %************************************************************************
975 %************************************************************************
978 tcIdDetails :: Type -> IfaceIdDetails -> IfL IdDetails
979 tcIdDetails _ IfVanillaId = return VanillaId
980 tcIdDetails _ IfDFunId = return DFunId
981 tcIdDetails ty (IfRecSelId naughty)
982 = return (RecSelId { sel_tycon = tc, sel_naughty = naughty })
984 (_, _, tau) = tcSplitSigmaTy ty
985 tc = tyConAppTyCon (funArgTy tau)
986 -- A bit fragile. Relies on the selector type looking like
987 -- forall abc. (stupid-context) => T a b c -> blah
989 tcIdInfo :: Bool -> Name -> Type -> IfaceIdInfo -> IfL IdInfo
990 tcIdInfo ignore_prags name ty info
991 | ignore_prags = return vanillaIdInfo
992 | otherwise = case info of
993 NoInfo -> return vanillaIdInfo
994 HasInfo info -> foldlM tcPrag init_info info
996 -- Set the CgInfo to something sensible but uninformative before
997 -- we start; default assumption is that it has CAFs
998 init_info = vanillaIdInfo
1000 tcPrag :: IdInfo -> IfaceInfoItem -> IfL IdInfo
1001 tcPrag info HsNoCafRefs = return (info `setCafInfo` NoCafRefs)
1002 tcPrag info (HsArity arity) = return (info `setArityInfo` arity)
1003 tcPrag info (HsStrictness str) = return (info `setAllStrictnessInfo` Just str)
1005 -- The next two are lazy, so they don't transitively suck stuff in
1006 tcPrag info (HsWorker nm arity) = tcWorkerInfo ty info nm arity
1007 tcPrag info (HsInline inline_prag) = return (info `setInlinePragInfo` inline_prag)
1008 tcPrag info (HsUnfold expr) = do
1009 maybe_expr' <- tcPragExpr name expr
1011 -- maybe_expr' doesn't get looked at if the unfolding
1012 -- is never inspected; so the typecheck doesn't even happen
1013 unfold_info = case maybe_expr' of
1014 Nothing -> noUnfolding
1015 Just expr' -> mkTopUnfolding expr'
1016 return (info `setUnfoldingInfoLazily` unfold_info)
1020 tcWorkerInfo :: Type -> IdInfo -> Name -> Arity -> IfL IdInfo
1021 tcWorkerInfo ty info wkr arity
1022 = do { mb_wkr_id <- forkM_maybe doc (tcIfaceExtId wkr)
1024 -- We return without testing maybe_wkr_id, but as soon as info is
1025 -- looked at we will test it. That's ok, because its outside the
1026 -- knot; and there seems no big reason to further defer the
1027 -- tcIfaceId lookup. (Contrast with tcPragExpr, where postponing walking
1028 -- over the unfolding until it's actually used does seem worth while.)
1029 ; us <- newUniqueSupply
1031 ; return (case mb_wkr_id of
1033 Just wkr_id -> add_wkr_info us wkr_id info) }
1035 doc = text "Worker for" <+> ppr wkr
1036 add_wkr_info us wkr_id info
1037 = info `setUnfoldingInfoLazily` mk_unfolding us wkr_id
1038 `setWorkerInfo` HasWorker wkr_id arity
1040 mk_unfolding us wkr_id = mkTopUnfolding (initUs_ us (mkWrapper ty strict_sig) wkr_id)
1042 -- We are relying here on strictness info always appearing
1043 -- before worker info, fingers crossed ....
1044 strict_sig = case newStrictnessInfo info of
1046 Nothing -> pprPanic "Worker info but no strictness for" (ppr wkr)
1049 For unfoldings we try to do the job lazily, so that we never type check
1050 an unfolding that isn't going to be looked at.
1053 tcPragExpr :: Name -> IfaceExpr -> IfL (Maybe CoreExpr)
1054 tcPragExpr name expr
1055 = forkM_maybe doc $ do
1056 core_expr' <- tcIfaceExpr expr
1058 -- Check for type consistency in the unfolding
1059 ifOptM Opt_DoCoreLinting $ do
1060 in_scope <- get_in_scope_ids
1061 case lintUnfolding noSrcLoc in_scope core_expr' of
1062 Nothing -> return ()
1063 Just fail_msg -> pprPanic "Iface Lint failure" (hang doc 2 fail_msg)
1067 doc = text "Unfolding of" <+> ppr name
1068 get_in_scope_ids -- Urgh; but just for linting
1070 do { env <- getGblEnv
1071 ; case if_rec_types env of {
1072 Nothing -> return [] ;
1073 Just (_, get_env) -> do
1074 { type_env <- get_env
1075 ; return (typeEnvIds type_env) }}}
1080 %************************************************************************
1082 Getting from Names to TyThings
1084 %************************************************************************
1087 tcIfaceGlobal :: Name -> IfL TyThing
1089 | Just thing <- wiredInNameTyThing_maybe name
1090 -- Wired-in things include TyCons, DataCons, and Ids
1091 = do { ifCheckWiredInThing thing; return thing }
1093 = do { env <- getGblEnv
1094 ; case if_rec_types env of { -- Note [Tying the knot]
1095 Just (mod, get_type_env)
1096 | nameIsLocalOrFrom mod name
1097 -> do -- It's defined in the module being compiled
1098 { type_env <- setLclEnv () get_type_env -- yuk
1099 ; case lookupNameEnv type_env name of
1100 Just thing -> return thing
1101 Nothing -> pprPanic "tcIfaceGlobal (local): not found:"
1102 (ppr name $$ ppr type_env) }
1106 { hsc_env <- getTopEnv
1107 ; mb_thing <- liftIO (lookupTypeHscEnv hsc_env name)
1108 ; case mb_thing of {
1109 Just thing -> return thing ;
1112 { mb_thing <- importDecl name -- It's imported; go get it
1114 Failed err -> failIfM err
1115 Succeeded thing -> return thing
1118 -- Note [Tying the knot]
1119 -- ~~~~~~~~~~~~~~~~~~~~~
1120 -- The if_rec_types field is used in two situations:
1122 -- a) Compiling M.hs, which indiretly imports Foo.hi, which mentions M.T
1123 -- Then we look up M.T in M's type environment, which is splatted into if_rec_types
1124 -- after we've built M's type envt.
1126 -- b) In ghc --make, during the upsweep, we encounter M.hs, whose interface M.hi
1127 -- is up to date. So we call typecheckIface on M.hi. This splats M.T into
1128 -- if_rec_types so that the (lazily typechecked) decls see all the other decls
1130 -- In case (b) it's important to do the if_rec_types check *before* looking in the HPT
1131 -- Because if M.hs also has M.hs-boot, M.T will *already be* in the HPT, but in its
1132 -- emasculated form (e.g. lacking data constructors).
1134 tcIfaceTyCon :: IfaceTyCon -> IfL TyCon
1135 tcIfaceTyCon IfaceIntTc = tcWiredInTyCon intTyCon
1136 tcIfaceTyCon IfaceBoolTc = tcWiredInTyCon boolTyCon
1137 tcIfaceTyCon IfaceCharTc = tcWiredInTyCon charTyCon
1138 tcIfaceTyCon IfaceListTc = tcWiredInTyCon listTyCon
1139 tcIfaceTyCon IfacePArrTc = tcWiredInTyCon parrTyCon
1140 tcIfaceTyCon (IfaceTupTc bx ar) = tcWiredInTyCon (tupleTyCon bx ar)
1141 tcIfaceTyCon (IfaceTc name) = do { thing <- tcIfaceGlobal name
1142 ; return (check_tc (tyThingTyCon thing)) }
1145 | debugIsOn = case toIfaceTyCon tc of
1147 _ -> pprTrace "check_tc" (ppr tc) tc
1149 -- we should be okay just returning Kind constructors without extra loading
1150 tcIfaceTyCon IfaceLiftedTypeKindTc = return liftedTypeKindTyCon
1151 tcIfaceTyCon IfaceOpenTypeKindTc = return openTypeKindTyCon
1152 tcIfaceTyCon IfaceUnliftedTypeKindTc = return unliftedTypeKindTyCon
1153 tcIfaceTyCon IfaceArgTypeKindTc = return argTypeKindTyCon
1154 tcIfaceTyCon IfaceUbxTupleKindTc = return ubxTupleKindTyCon
1156 -- Even though we are in an interface file, we want to make
1157 -- sure the instances and RULES of this tycon are loaded
1158 -- Imagine: f :: Double -> Double
1159 tcWiredInTyCon :: TyCon -> IfL TyCon
1160 tcWiredInTyCon tc = do { ifCheckWiredInThing (ATyCon tc)
1163 tcIfaceClass :: Name -> IfL Class
1164 tcIfaceClass name = do { thing <- tcIfaceGlobal name
1165 ; return (tyThingClass thing) }
1167 tcIfaceDataCon :: Name -> IfL DataCon
1168 tcIfaceDataCon name = do { thing <- tcIfaceGlobal name
1170 ADataCon dc -> return dc
1171 _ -> pprPanic "tcIfaceExtDC" (ppr name$$ ppr thing) }
1173 tcIfaceExtId :: Name -> IfL Id
1174 tcIfaceExtId name = do { thing <- tcIfaceGlobal name
1176 AnId id -> return id
1177 _ -> pprPanic "tcIfaceExtId" (ppr name$$ ppr thing) }
1180 %************************************************************************
1184 %************************************************************************
1187 bindIfaceBndr :: IfaceBndr -> (CoreBndr -> IfL a) -> IfL a
1188 bindIfaceBndr (IfaceIdBndr (fs, ty)) thing_inside
1189 = do { name <- newIfaceName (mkVarOccFS fs)
1190 ; ty' <- tcIfaceType ty
1191 ; let id = mkLocalId name ty'
1192 ; extendIfaceIdEnv [id] (thing_inside id) }
1193 bindIfaceBndr (IfaceTvBndr bndr) thing_inside
1194 = bindIfaceTyVar bndr thing_inside
1196 bindIfaceBndrs :: [IfaceBndr] -> ([CoreBndr] -> IfL a) -> IfL a
1197 bindIfaceBndrs [] thing_inside = thing_inside []
1198 bindIfaceBndrs (b:bs) thing_inside
1199 = bindIfaceBndr b $ \ b' ->
1200 bindIfaceBndrs bs $ \ bs' ->
1201 thing_inside (b':bs')
1203 -----------------------
1204 tcIfaceLetBndr :: IfaceLetBndr -> IfL Id
1205 tcIfaceLetBndr (IfLetBndr fs ty info)
1206 = do { name <- newIfaceName (mkVarOccFS fs)
1207 ; ty' <- tcIfaceType ty
1209 NoInfo -> return (mkLocalId name ty')
1210 HasInfo i -> return (mkLocalIdWithInfo name ty' (tc_info i)) }
1212 -- Similar to tcIdInfo, but much simpler
1213 tc_info [] = vanillaIdInfo
1214 tc_info (HsInline p : i) = tc_info i `setInlinePragInfo` p
1215 tc_info (HsArity a : i) = tc_info i `setArityInfo` a
1216 tc_info (HsStrictness s : i) = tc_info i `setAllStrictnessInfo` Just s
1217 tc_info (other : i) = pprTrace "tcIfaceLetBndr: discarding unexpected IdInfo"
1218 (ppr other) (tc_info i)
1220 -----------------------
1221 newExtCoreBndr :: IfaceLetBndr -> IfL Id
1222 newExtCoreBndr (IfLetBndr var ty _) -- Ignoring IdInfo for now
1223 = do { mod <- getIfModule
1224 ; name <- newGlobalBinder mod (mkVarOccFS var) noSrcSpan
1225 ; ty' <- tcIfaceType ty
1226 ; return (mkLocalId name ty') }
1228 -----------------------
1229 bindIfaceTyVar :: IfaceTvBndr -> (TyVar -> IfL a) -> IfL a
1230 bindIfaceTyVar (occ,kind) thing_inside
1231 = do { name <- newIfaceName (mkTyVarOccFS occ)
1232 ; tyvar <- mk_iface_tyvar name kind
1233 ; extendIfaceTyVarEnv [tyvar] (thing_inside tyvar) }
1235 bindIfaceTyVars :: [IfaceTvBndr] -> ([TyVar] -> IfL a) -> IfL a
1236 bindIfaceTyVars bndrs thing_inside
1237 = do { names <- newIfaceNames (map mkTyVarOccFS occs)
1238 ; tyvars <- zipWithM mk_iface_tyvar names kinds
1239 ; extendIfaceTyVarEnv tyvars (thing_inside tyvars) }
1241 (occs,kinds) = unzip bndrs
1243 mk_iface_tyvar :: Name -> IfaceKind -> IfL TyVar
1244 mk_iface_tyvar name ifKind
1245 = do { kind <- tcIfaceType ifKind
1246 ; if isCoercionKind kind then
1247 return (Var.mkCoVar name kind)
1249 return (Var.mkTyVar name kind) }