2 % (c) The AQUA Project, Glasgow University, 1996-1998
4 \section[TcHsSyn]{Specialisations of the @HsSyn@ syntax for the typechecker}
6 This module is an extension of @HsSyn@ syntax, for use in the type
11 TcMonoBinds, TcHsBinds, TcPat,
12 TcExpr, TcGRHSs, TcGRHS, TcMatch,
13 TcStmt, TcArithSeqInfo, TcRecordBinds,
14 TcHsModule, TcCoreExpr, TcDictBinds,
17 TypecheckedHsBinds, TypecheckedRuleDecl,
18 TypecheckedMonoBinds, TypecheckedPat,
19 TypecheckedHsExpr, TypecheckedArithSeqInfo,
20 TypecheckedStmt, TypecheckedForeignDecl,
21 TypecheckedMatch, TypecheckedHsModule,
22 TypecheckedGRHSs, TypecheckedGRHS,
23 TypecheckedRecordBinds, TypecheckedDictBinds,
24 TypecheckedMatchContext,
26 mkHsTyApp, mkHsDictApp, mkHsConApp,
27 mkHsTyLam, mkHsDictLam, mkHsLet,
30 collectTypedPatBinders, outPatType,
32 -- re-exported from TcEnv
35 zonkTopBinds, zonkId, zonkIdBndr, zonkIdOcc, zonkExpr,
36 zonkForeignExports, zonkRules
39 #include "HsVersions.h"
42 import HsSyn -- oodles of it
45 import Id ( idName, idType, setIdType, Id )
46 import DataCon ( dataConWrapId )
47 import TcEnv ( tcLookupGlobal_maybe, tcExtendGlobalValEnv, TcEnv, TcId )
51 import TcType ( TcType )
52 import TcMType ( zonkTcTypeToType, zonkTcTyVarToTyVar, zonkTcType, zonkTcSigTyVars )
53 import TysPrim ( charPrimTy, intPrimTy, floatPrimTy,
54 doublePrimTy, addrPrimTy
56 import TysWiredIn ( charTy, stringTy, intTy, integerTy,
57 mkListTy, mkPArrTy, mkTupleTy, unitTy )
58 import CoreSyn ( Expr )
60 import BasicTypes ( RecFlag(..), Boxity(..), IPName(..), ipNameName )
63 import HscTypes ( TyThing(..) )
70 The @Tc...@ datatypes are the ones that apply {\em during} type checking.
71 All the types in @Tc...@ things have mutable type-variables in them for
74 At the end of type checking we zonk everything to @Typechecked...@ datatypes,
75 which have immutable type variables in them.
78 type TcHsBinds = HsBinds TcId TcPat
79 type TcMonoBinds = MonoBinds TcId TcPat
80 type TcDictBinds = TcMonoBinds
81 type TcPat = OutPat TcId
82 type TcExpr = HsExpr TcId TcPat
83 type TcGRHSs = GRHSs TcId TcPat
84 type TcGRHS = GRHS TcId TcPat
85 type TcMatch = Match TcId TcPat
86 type TcStmt = Stmt TcId TcPat
87 type TcArithSeqInfo = ArithSeqInfo TcId TcPat
88 type TcRecordBinds = HsRecordBinds TcId TcPat
89 type TcHsModule = HsModule TcId TcPat
91 type TcCoreExpr = Expr TcId
92 type TcForeignExportDecl = ForeignDecl TcId
93 type TcRuleDecl = RuleDecl TcId TcPat
95 type TypecheckedPat = OutPat Id
96 type TypecheckedMonoBinds = MonoBinds Id TypecheckedPat
97 type TypecheckedDictBinds = TypecheckedMonoBinds
98 type TypecheckedHsBinds = HsBinds Id TypecheckedPat
99 type TypecheckedHsExpr = HsExpr Id TypecheckedPat
100 type TypecheckedArithSeqInfo = ArithSeqInfo Id TypecheckedPat
101 type TypecheckedStmt = Stmt Id TypecheckedPat
102 type TypecheckedMatch = Match Id TypecheckedPat
103 type TypecheckedMatchContext = HsMatchContext Id
104 type TypecheckedGRHSs = GRHSs Id TypecheckedPat
105 type TypecheckedGRHS = GRHS Id TypecheckedPat
106 type TypecheckedRecordBinds = HsRecordBinds Id TypecheckedPat
107 type TypecheckedHsModule = HsModule Id TypecheckedPat
108 type TypecheckedForeignDecl = ForeignDecl Id
109 type TypecheckedRuleDecl = RuleDecl Id TypecheckedPat
113 mkHsTyApp expr [] = expr
114 mkHsTyApp expr tys = TyApp expr tys
116 mkHsDictApp expr [] = expr
117 mkHsDictApp expr dict_vars = DictApp expr dict_vars
119 mkHsTyLam [] expr = expr
120 mkHsTyLam tyvars expr = TyLam tyvars expr
122 mkHsDictLam [] expr = expr
123 mkHsDictLam dicts expr = DictLam dicts expr
125 mkHsLet EmptyMonoBinds expr = expr
126 mkHsLet mbinds expr = HsLet (MonoBind mbinds [] Recursive) expr
128 mkHsConApp data_con tys args = foldl HsApp (HsVar (dataConWrapId data_con) `mkHsTyApp` tys) args
132 ------------------------------------------------------
134 simpleHsLitTy :: HsLit -> TcType
135 simpleHsLitTy (HsCharPrim c) = charPrimTy
136 simpleHsLitTy (HsStringPrim s) = addrPrimTy
137 simpleHsLitTy (HsInt i) = intTy
138 simpleHsLitTy (HsInteger i) = integerTy
139 simpleHsLitTy (HsIntPrim i) = intPrimTy
140 simpleHsLitTy (HsFloatPrim f) = floatPrimTy
141 simpleHsLitTy (HsDoublePrim d) = doublePrimTy
142 simpleHsLitTy (HsChar c) = charTy
143 simpleHsLitTy (HsString str) = stringTy
147 %************************************************************************
149 \subsection[mkFailurePair]{Code for pattern-matching and other failures}
151 %************************************************************************
153 Note: If @outPatType@ doesn't bear a strong resemblance to @exprType@,
154 then something is wrong.
156 outPatType :: TypecheckedPat -> Type
158 outPatType (WildPat ty) = ty
159 outPatType (VarPat var) = idType var
160 outPatType (LazyPat pat) = outPatType pat
161 outPatType (AsPat var pat) = idType var
162 outPatType (ConPat _ ty _ _ _) = ty
163 outPatType (ListPat ty _) = mkListTy ty
164 outPatType (PArrPat ty _) = mkPArrTy ty
165 outPatType (TuplePat pats box) = mkTupleTy box (length pats) (map outPatType pats)
166 outPatType (RecPat _ ty _ _ _) = ty
167 outPatType (SigPat _ ty _) = ty
168 outPatType (LitPat lit ty) = ty
169 outPatType (NPat lit ty _) = ty
170 outPatType (NPlusKPat _ _ ty _ _) = ty
171 outPatType (DictPat ds ms) = case (length ds_ms) of
173 1 -> idType (head ds_ms)
174 n -> mkTupleTy Boxed n (map idType ds_ms)
180 Nota bene: @DsBinds@ relies on the fact that at least for simple
181 tuple patterns @collectTypedPatBinders@ returns the binders in
182 the same order as they appear in the tuple.
184 @collectTypedBinders@ and @collectedTypedPatBinders@ are the exportees.
187 collectTypedPatBinders :: TypecheckedPat -> [Id]
188 collectTypedPatBinders (VarPat var) = [var]
189 collectTypedPatBinders (LazyPat pat) = collectTypedPatBinders pat
190 collectTypedPatBinders (AsPat a pat) = a : collectTypedPatBinders pat
191 collectTypedPatBinders (SigPat pat _ _) = collectTypedPatBinders pat
192 collectTypedPatBinders (ConPat _ _ _ _ pats) = concat (map collectTypedPatBinders pats)
193 collectTypedPatBinders (ListPat t pats) = concat (map collectTypedPatBinders pats)
194 collectTypedPatBinders (PArrPat t pats) = concat (map collectTypedPatBinders pats)
195 collectTypedPatBinders (TuplePat pats _) = concat (map collectTypedPatBinders pats)
196 collectTypedPatBinders (RecPat _ _ _ _ fields) = concat (map (\ (f,pat,_) -> collectTypedPatBinders pat)
198 collectTypedPatBinders (DictPat ds ms) = ds ++ ms
199 collectTypedPatBinders (NPlusKPat var _ _ _ _) = [var]
200 collectTypedPatBinders any_other_pat = [ {-no binders-} ]
204 %************************************************************************
206 \subsection[BackSubst-HsBinds]{Running a substitution over @HsBinds@}
208 %************************************************************************
210 This zonking pass runs over the bindings
212 a) to convert TcTyVars to TyVars etc, dereferencing any bindings etc
213 b) convert unbound TcTyVar to Void
214 c) convert each TcId to an Id by zonking its type
216 The type variables are converted by binding mutable tyvars to immutable ones
217 and then zonking as normal.
219 The Ids are converted by binding them in the normal Tc envt; that
220 way we maintain sharing; eg an Id is zonked at its binding site and they
221 all occurrences of that Id point to the common zonked copy
223 It's all pretty boring stuff, because HsSyn is such a large type, and
224 the environment manipulation is tiresome.
227 -- zonkId is used *during* typechecking just to zonk the Id's type
228 zonkId :: TcId -> NF_TcM TcId
230 = zonkTcType (idType id) `thenNF_Tc` \ ty' ->
231 returnNF_Tc (setIdType id ty')
233 -- zonkIdBndr is used *after* typechecking to get the Id's type
234 -- to its final form. The TyVarEnv give
235 zonkIdBndr :: TcId -> NF_TcM Id
237 = zonkTcTypeToType (idType id) `thenNF_Tc` \ ty' ->
238 returnNF_Tc (setIdType id ty')
240 zonkIdOcc :: TcId -> NF_TcM Id
242 = tcLookupGlobal_maybe (idName id) `thenNF_Tc` \ maybe_id' ->
243 -- We're even look up up superclass selectors and constructors;
244 -- even though zonking them is a no-op anyway, and the
245 -- superclass selectors aren't in the environment anyway.
246 -- But we don't want to call isLocalId to find out whether
247 -- it's a superclass selector (for example) because that looks
248 -- at the IdInfo field, which in turn be in a knot because of
249 -- the big knot in typecheckModule
251 new_id = case maybe_id' of
252 Just (AnId id') -> id'
253 other -> id -- WARN( isLocalId id, ppr id ) id
254 -- Oops: the warning can give a black hole
255 -- because it looks at the idinfo
262 zonkTopBinds :: TcMonoBinds -> NF_TcM (TypecheckedMonoBinds, TcEnv)
263 zonkTopBinds binds -- Top level is implicitly recursive
264 = fixNF_Tc (\ ~(_, new_ids) ->
265 tcExtendGlobalValEnv (bagToList new_ids) $
266 zonkMonoBinds binds `thenNF_Tc` \ (binds', new_ids) ->
267 tcGetEnv `thenNF_Tc` \ env ->
268 returnNF_Tc ((binds', env), new_ids)
269 ) `thenNF_Tc` \ (stuff, _) ->
272 zonkBinds :: TcHsBinds -> NF_TcM (TypecheckedHsBinds, TcEnv)
275 = go binds (\ binds' -> tcGetEnv `thenNF_Tc` \ env ->
276 returnNF_Tc (binds', env))
279 -- -> (TypecheckedHsBinds
280 -- -> NF_TcM (TypecheckedHsBinds, TcEnv)
282 -- -> NF_TcM (TypecheckedHsBinds, TcEnv)
284 go (ThenBinds b1 b2) thing_inside = go b1 $ \ b1' ->
286 thing_inside (b1' `ThenBinds` b2')
288 go EmptyBinds thing_inside = thing_inside EmptyBinds
290 go (MonoBind bind sigs is_rec) thing_inside
291 = ASSERT( null sigs )
292 fixNF_Tc (\ ~(_, new_ids) ->
293 tcExtendGlobalValEnv (bagToList new_ids) $
294 zonkMonoBinds bind `thenNF_Tc` \ (new_bind, new_ids) ->
295 thing_inside (mkMonoBind new_bind [] is_rec) `thenNF_Tc` \ stuff ->
296 returnNF_Tc (stuff, new_ids)
297 ) `thenNF_Tc` \ (stuff, _) ->
302 -------------------------------------------------------------------------
303 zonkMonoBinds :: TcMonoBinds
304 -> NF_TcM (TypecheckedMonoBinds, Bag Id)
306 zonkMonoBinds EmptyMonoBinds = returnNF_Tc (EmptyMonoBinds, emptyBag)
308 zonkMonoBinds (AndMonoBinds mbinds1 mbinds2)
309 = zonkMonoBinds mbinds1 `thenNF_Tc` \ (b1', ids1) ->
310 zonkMonoBinds mbinds2 `thenNF_Tc` \ (b2', ids2) ->
311 returnNF_Tc (b1' `AndMonoBinds` b2',
312 ids1 `unionBags` ids2)
314 zonkMonoBinds (PatMonoBind pat grhss locn)
315 = zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
316 zonkGRHSs grhss `thenNF_Tc` \ new_grhss ->
317 returnNF_Tc (PatMonoBind new_pat new_grhss locn, ids)
319 zonkMonoBinds (VarMonoBind var expr)
320 = zonkIdBndr var `thenNF_Tc` \ new_var ->
321 zonkExpr expr `thenNF_Tc` \ new_expr ->
322 returnNF_Tc (VarMonoBind new_var new_expr, unitBag new_var)
324 zonkMonoBinds (CoreMonoBind var core_expr)
325 = zonkIdBndr var `thenNF_Tc` \ new_var ->
326 returnNF_Tc (CoreMonoBind new_var core_expr, unitBag new_var)
328 zonkMonoBinds (FunMonoBind var inf ms locn)
329 = zonkIdBndr var `thenNF_Tc` \ new_var ->
330 mapNF_Tc zonkMatch ms `thenNF_Tc` \ new_ms ->
331 returnNF_Tc (FunMonoBind new_var inf new_ms locn, unitBag new_var)
334 zonkMonoBinds (AbsBinds tyvars dicts exports inlines val_bind)
335 = mapNF_Tc zonkTcTyVarToTyVar tyvars `thenNF_Tc` \ new_tyvars ->
336 -- No need to extend tyvar env: the effects are
337 -- propagated through binding the tyvars themselves
339 mapNF_Tc zonkIdBndr dicts `thenNF_Tc` \ new_dicts ->
340 tcExtendGlobalValEnv new_dicts $
342 fixNF_Tc (\ ~(_, _, val_bind_ids) ->
343 tcExtendGlobalValEnv (bagToList val_bind_ids) $
344 zonkMonoBinds val_bind `thenNF_Tc` \ (new_val_bind, val_bind_ids) ->
345 mapNF_Tc zonkExport exports `thenNF_Tc` \ new_exports ->
346 returnNF_Tc (new_val_bind, new_exports, val_bind_ids)
347 ) `thenNF_Tc ` \ (new_val_bind, new_exports, _) ->
349 new_globals = listToBag [global | (_, global, local) <- new_exports]
351 returnNF_Tc (AbsBinds new_tyvars new_dicts new_exports inlines new_val_bind,
354 zonkExport (tyvars, global, local)
355 = zonkTcSigTyVars tyvars `thenNF_Tc` \ new_tyvars ->
356 -- This isn't the binding occurrence of these tyvars
357 -- but they should *be* tyvars. Hence zonkTcSigTyVars.
358 zonkIdBndr global `thenNF_Tc` \ new_global ->
359 zonkIdOcc local `thenNF_Tc` \ new_local ->
360 returnNF_Tc (new_tyvars, new_global, new_local)
363 %************************************************************************
365 \subsection[BackSubst-Match-GRHSs]{Match and GRHSs}
367 %************************************************************************
370 zonkMatch :: TcMatch -> NF_TcM TypecheckedMatch
372 zonkMatch (Match pats _ grhss)
373 = zonkPats pats `thenNF_Tc` \ (new_pats, new_ids) ->
374 tcExtendGlobalValEnv (bagToList new_ids) $
375 zonkGRHSs grhss `thenNF_Tc` \ new_grhss ->
376 returnNF_Tc (Match new_pats Nothing new_grhss)
378 -------------------------------------------------------------------------
380 -> NF_TcM TypecheckedGRHSs
382 zonkGRHSs (GRHSs grhss binds ty)
383 = zonkBinds binds `thenNF_Tc` \ (new_binds, new_env) ->
386 zonk_grhs (GRHS guarded locn)
387 = zonkStmts guarded `thenNF_Tc` \ new_guarded ->
388 returnNF_Tc (GRHS new_guarded locn)
390 mapNF_Tc zonk_grhs grhss `thenNF_Tc` \ new_grhss ->
391 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
392 returnNF_Tc (GRHSs new_grhss new_binds new_ty)
395 %************************************************************************
397 \subsection[BackSubst-HsExpr]{Running a zonkitution over a TypeCheckedExpr}
399 %************************************************************************
402 zonkExpr :: TcExpr -> NF_TcM TypecheckedHsExpr
405 = zonkIdOcc id `thenNF_Tc` \ id' ->
406 returnNF_Tc (HsVar id')
408 zonkExpr (HsIPVar id)
409 = mapIPNameTc zonkIdOcc id `thenNF_Tc` \ id' ->
410 returnNF_Tc (HsIPVar id')
412 zonkExpr (HsLit (HsRat f ty))
413 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
414 returnNF_Tc (HsLit (HsRat f new_ty))
416 zonkExpr (HsLit (HsLitLit lit ty))
417 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
418 returnNF_Tc (HsLit (HsLitLit lit new_ty))
421 = returnNF_Tc (HsLit lit)
423 -- HsOverLit doesn't appear in typechecker output
425 zonkExpr (HsLam match)
426 = zonkMatch match `thenNF_Tc` \ new_match ->
427 returnNF_Tc (HsLam new_match)
429 zonkExpr (HsApp e1 e2)
430 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
431 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
432 returnNF_Tc (HsApp new_e1 new_e2)
434 zonkExpr (OpApp e1 op fixity e2)
435 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
436 zonkExpr op `thenNF_Tc` \ new_op ->
437 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
438 returnNF_Tc (OpApp new_e1 new_op fixity new_e2)
440 zonkExpr (NegApp _ _) = panic "zonkExpr: NegApp"
441 zonkExpr (HsPar _) = panic "zonkExpr: HsPar"
443 zonkExpr (SectionL expr op)
444 = zonkExpr expr `thenNF_Tc` \ new_expr ->
445 zonkExpr op `thenNF_Tc` \ new_op ->
446 returnNF_Tc (SectionL new_expr new_op)
448 zonkExpr (SectionR op expr)
449 = zonkExpr op `thenNF_Tc` \ new_op ->
450 zonkExpr expr `thenNF_Tc` \ new_expr ->
451 returnNF_Tc (SectionR new_op new_expr)
453 zonkExpr (HsCase expr ms src_loc)
454 = zonkExpr expr `thenNF_Tc` \ new_expr ->
455 mapNF_Tc zonkMatch ms `thenNF_Tc` \ new_ms ->
456 returnNF_Tc (HsCase new_expr new_ms src_loc)
458 zonkExpr (HsIf e1 e2 e3 src_loc)
459 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
460 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
461 zonkExpr e3 `thenNF_Tc` \ new_e3 ->
462 returnNF_Tc (HsIf new_e1 new_e2 new_e3 src_loc)
464 zonkExpr (HsLet binds expr)
465 = zonkBinds binds `thenNF_Tc` \ (new_binds, new_env) ->
467 zonkExpr expr `thenNF_Tc` \ new_expr ->
468 returnNF_Tc (HsLet new_binds new_expr)
470 zonkExpr (HsWith expr binds)
471 = zonkIPBinds binds `thenNF_Tc` \ new_binds ->
472 tcExtendGlobalValEnv (map (ipNameName . fst) new_binds) $
473 zonkExpr expr `thenNF_Tc` \ new_expr ->
474 returnNF_Tc (HsWith new_expr new_binds)
476 zonkIPBinds = mapNF_Tc zonkIPBind
478 = mapIPNameTc zonkIdBndr n `thenNF_Tc` \ n' ->
479 zonkExpr e `thenNF_Tc` \ e' ->
482 zonkExpr (HsDo _ _ _) = panic "zonkExpr:HsDo"
484 zonkExpr (HsDoOut do_or_lc stmts return_id then_id zero_id ty src_loc)
485 = zonkStmts stmts `thenNF_Tc` \ new_stmts ->
486 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
487 zonkIdOcc return_id `thenNF_Tc` \ new_return_id ->
488 zonkIdOcc then_id `thenNF_Tc` \ new_then_id ->
489 zonkIdOcc zero_id `thenNF_Tc` \ new_zero_id ->
490 returnNF_Tc (HsDoOut do_or_lc new_stmts new_return_id new_then_id new_zero_id
493 zonkExpr (ExplicitList ty exprs)
494 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
495 mapNF_Tc zonkExpr exprs `thenNF_Tc` \ new_exprs ->
496 returnNF_Tc (ExplicitList new_ty new_exprs)
498 zonkExpr (ExplicitPArr ty exprs)
499 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
500 mapNF_Tc zonkExpr exprs `thenNF_Tc` \ new_exprs ->
501 returnNF_Tc (ExplicitPArr new_ty new_exprs)
503 zonkExpr (ExplicitTuple exprs boxed)
504 = mapNF_Tc zonkExpr exprs `thenNF_Tc` \ new_exprs ->
505 returnNF_Tc (ExplicitTuple new_exprs boxed)
507 zonkExpr (RecordConOut data_con con_expr rbinds)
508 = zonkExpr con_expr `thenNF_Tc` \ new_con_expr ->
509 zonkRbinds rbinds `thenNF_Tc` \ new_rbinds ->
510 returnNF_Tc (RecordConOut data_con new_con_expr new_rbinds)
512 zonkExpr (RecordUpd _ _) = panic "zonkExpr:RecordUpd"
514 zonkExpr (RecordUpdOut expr in_ty out_ty dicts rbinds)
515 = zonkExpr expr `thenNF_Tc` \ new_expr ->
516 zonkTcTypeToType in_ty `thenNF_Tc` \ new_in_ty ->
517 zonkTcTypeToType out_ty `thenNF_Tc` \ new_out_ty ->
518 mapNF_Tc zonkIdOcc dicts `thenNF_Tc` \ new_dicts ->
519 zonkRbinds rbinds `thenNF_Tc` \ new_rbinds ->
520 returnNF_Tc (RecordUpdOut new_expr new_in_ty new_out_ty new_dicts new_rbinds)
522 zonkExpr (ExprWithTySig _ _) = panic "zonkExpr:ExprWithTySig"
523 zonkExpr (ArithSeqIn _) = panic "zonkExpr:ArithSeqIn"
524 zonkExpr (PArrSeqIn _) = panic "zonkExpr:PArrSeqIn"
526 zonkExpr (ArithSeqOut expr info)
527 = zonkExpr expr `thenNF_Tc` \ new_expr ->
528 zonkArithSeq info `thenNF_Tc` \ new_info ->
529 returnNF_Tc (ArithSeqOut new_expr new_info)
531 zonkExpr (PArrSeqOut expr info)
532 = zonkExpr expr `thenNF_Tc` \ new_expr ->
533 zonkArithSeq info `thenNF_Tc` \ new_info ->
534 returnNF_Tc (PArrSeqOut new_expr new_info)
536 zonkExpr (HsCCall fun args may_gc is_casm result_ty)
537 = mapNF_Tc zonkExpr args `thenNF_Tc` \ new_args ->
538 zonkTcTypeToType result_ty `thenNF_Tc` \ new_result_ty ->
539 returnNF_Tc (HsCCall fun new_args may_gc is_casm new_result_ty)
541 zonkExpr (HsSCC lbl expr)
542 = zonkExpr expr `thenNF_Tc` \ new_expr ->
543 returnNF_Tc (HsSCC lbl new_expr)
545 zonkExpr (TyLam tyvars expr)
546 = mapNF_Tc zonkTcTyVarToTyVar tyvars `thenNF_Tc` \ new_tyvars ->
547 -- No need to extend tyvar env; see AbsBinds
549 zonkExpr expr `thenNF_Tc` \ new_expr ->
550 returnNF_Tc (TyLam new_tyvars new_expr)
552 zonkExpr (TyApp expr tys)
553 = zonkExpr expr `thenNF_Tc` \ new_expr ->
554 mapNF_Tc zonkTcTypeToType tys `thenNF_Tc` \ new_tys ->
555 returnNF_Tc (TyApp new_expr new_tys)
557 zonkExpr (DictLam dicts expr)
558 = mapNF_Tc zonkIdBndr dicts `thenNF_Tc` \ new_dicts ->
559 tcExtendGlobalValEnv new_dicts $
560 zonkExpr expr `thenNF_Tc` \ new_expr ->
561 returnNF_Tc (DictLam new_dicts new_expr)
563 zonkExpr (DictApp expr dicts)
564 = zonkExpr expr `thenNF_Tc` \ new_expr ->
565 mapNF_Tc zonkIdOcc dicts `thenNF_Tc` \ new_dicts ->
566 returnNF_Tc (DictApp new_expr new_dicts)
570 -------------------------------------------------------------------------
571 zonkArithSeq :: TcArithSeqInfo -> NF_TcM TypecheckedArithSeqInfo
573 zonkArithSeq (From e)
574 = zonkExpr e `thenNF_Tc` \ new_e ->
575 returnNF_Tc (From new_e)
577 zonkArithSeq (FromThen e1 e2)
578 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
579 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
580 returnNF_Tc (FromThen new_e1 new_e2)
582 zonkArithSeq (FromTo e1 e2)
583 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
584 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
585 returnNF_Tc (FromTo new_e1 new_e2)
587 zonkArithSeq (FromThenTo e1 e2 e3)
588 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
589 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
590 zonkExpr e3 `thenNF_Tc` \ new_e3 ->
591 returnNF_Tc (FromThenTo new_e1 new_e2 new_e3)
593 -------------------------------------------------------------------------
594 zonkStmts :: [TcStmt]
595 -> NF_TcM [TypecheckedStmt]
597 zonkStmts [] = returnNF_Tc []
599 zonkStmts (ParStmtOut bndrstmtss : stmts)
600 = mapNF_Tc (mapNF_Tc zonkId) bndrss `thenNF_Tc` \ new_bndrss ->
601 let new_binders = concat new_bndrss in
602 mapNF_Tc zonkStmts stmtss `thenNF_Tc` \ new_stmtss ->
603 tcExtendGlobalValEnv new_binders $
604 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
605 returnNF_Tc (ParStmtOut (zip new_bndrss new_stmtss) : new_stmts)
606 where (bndrss, stmtss) = unzip bndrstmtss
608 zonkStmts (ResultStmt expr locn : stmts)
609 = zonkExpr expr `thenNF_Tc` \ new_expr ->
610 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
611 returnNF_Tc (ResultStmt new_expr locn : new_stmts)
613 zonkStmts (ExprStmt expr ty locn : stmts)
614 = zonkExpr expr `thenNF_Tc` \ new_expr ->
615 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
616 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
617 returnNF_Tc (ExprStmt new_expr new_ty locn : new_stmts)
619 zonkStmts (LetStmt binds : stmts)
620 = zonkBinds binds `thenNF_Tc` \ (new_binds, new_env) ->
622 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
623 returnNF_Tc (LetStmt new_binds : new_stmts)
625 zonkStmts (BindStmt pat expr locn : stmts)
626 = zonkExpr expr `thenNF_Tc` \ new_expr ->
627 zonkPat pat `thenNF_Tc` \ (new_pat, new_ids) ->
628 tcExtendGlobalValEnv (bagToList new_ids) $
629 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
630 returnNF_Tc (BindStmt new_pat new_expr locn : new_stmts)
634 -------------------------------------------------------------------------
635 zonkRbinds :: TcRecordBinds -> NF_TcM TypecheckedRecordBinds
638 = mapNF_Tc zonk_rbind rbinds
640 zonk_rbind (field, expr, pun)
641 = zonkExpr expr `thenNF_Tc` \ new_expr ->
642 zonkIdOcc field `thenNF_Tc` \ new_field ->
643 returnNF_Tc (new_field, new_expr, pun)
645 -------------------------------------------------------------------------
646 mapIPNameTc :: (a -> NF_TcM b) -> IPName a -> NF_TcM (IPName b)
647 mapIPNameTc f (Dupable n) = f n `thenNF_Tc` \ r -> returnNF_Tc (Dupable r)
648 mapIPNameTc f (Linear n) = f n `thenNF_Tc` \ r -> returnNF_Tc (Linear r)
652 %************************************************************************
654 \subsection[BackSubst-Pats]{Patterns}
656 %************************************************************************
659 zonkPat :: TcPat -> NF_TcM (TypecheckedPat, Bag Id)
662 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
663 returnNF_Tc (WildPat new_ty, emptyBag)
666 = zonkIdBndr v `thenNF_Tc` \ new_v ->
667 returnNF_Tc (VarPat new_v, unitBag new_v)
669 zonkPat (LazyPat pat)
670 = zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
671 returnNF_Tc (LazyPat new_pat, ids)
673 zonkPat (AsPat n pat)
674 = zonkIdBndr n `thenNF_Tc` \ new_n ->
675 zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
676 returnNF_Tc (AsPat new_n new_pat, new_n `consBag` ids)
678 zonkPat (ListPat ty pats)
679 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
680 zonkPats pats `thenNF_Tc` \ (new_pats, ids) ->
681 returnNF_Tc (ListPat new_ty new_pats, ids)
683 zonkPat (PArrPat ty pats)
684 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
685 zonkPats pats `thenNF_Tc` \ (new_pats, ids) ->
686 returnNF_Tc (PArrPat new_ty new_pats, ids)
688 zonkPat (TuplePat pats boxed)
689 = zonkPats pats `thenNF_Tc` \ (new_pats, ids) ->
690 returnNF_Tc (TuplePat new_pats boxed, ids)
692 zonkPat (ConPat n ty tvs dicts pats)
693 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
694 mapNF_Tc zonkTcTyVarToTyVar tvs `thenNF_Tc` \ new_tvs ->
695 mapNF_Tc zonkIdBndr dicts `thenNF_Tc` \ new_dicts ->
696 tcExtendGlobalValEnv new_dicts $
697 zonkPats pats `thenNF_Tc` \ (new_pats, ids) ->
698 returnNF_Tc (ConPat n new_ty new_tvs new_dicts new_pats,
699 listToBag new_dicts `unionBags` ids)
701 zonkPat (RecPat n ty tvs dicts rpats)
702 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
703 mapNF_Tc zonkTcTyVarToTyVar tvs `thenNF_Tc` \ new_tvs ->
704 mapNF_Tc zonkIdBndr dicts `thenNF_Tc` \ new_dicts ->
705 tcExtendGlobalValEnv new_dicts $
706 mapAndUnzipNF_Tc zonk_rpat rpats `thenNF_Tc` \ (new_rpats, ids_s) ->
707 returnNF_Tc (RecPat n new_ty new_tvs new_dicts new_rpats,
708 listToBag new_dicts `unionBags` unionManyBags ids_s)
710 zonk_rpat (f, pat, pun)
711 = zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
712 returnNF_Tc ((f, new_pat, pun), ids)
714 zonkPat (LitPat lit ty)
715 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
716 returnNF_Tc (LitPat lit new_ty, emptyBag)
718 zonkPat (SigPat pat ty expr)
719 = zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
720 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
721 zonkExpr expr `thenNF_Tc` \ new_expr ->
722 returnNF_Tc (SigPat new_pat new_ty new_expr, ids)
724 zonkPat (NPat lit ty expr)
725 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
726 zonkExpr expr `thenNF_Tc` \ new_expr ->
727 returnNF_Tc (NPat lit new_ty new_expr, emptyBag)
729 zonkPat (NPlusKPat n k ty e1 e2)
730 = zonkIdBndr n `thenNF_Tc` \ new_n ->
731 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
732 zonkExpr e1 `thenNF_Tc` \ new_e1 ->
733 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
734 returnNF_Tc (NPlusKPat new_n k new_ty new_e1 new_e2, unitBag new_n)
736 zonkPat (DictPat ds ms)
737 = mapNF_Tc zonkIdBndr ds `thenNF_Tc` \ new_ds ->
738 mapNF_Tc zonkIdBndr ms `thenNF_Tc` \ new_ms ->
739 returnNF_Tc (DictPat new_ds new_ms,
740 listToBag new_ds `unionBags` listToBag new_ms)
744 = returnNF_Tc ([], emptyBag)
747 = zonkPat pat `thenNF_Tc` \ (pat', ids1) ->
748 zonkPats pats `thenNF_Tc` \ (pats', ids2) ->
749 returnNF_Tc (pat':pats', ids1 `unionBags` ids2)
752 %************************************************************************
754 \subsection[BackSubst-Foreign]{Foreign exports}
756 %************************************************************************
760 zonkForeignExports :: [TcForeignExportDecl] -> NF_TcM [TypecheckedForeignDecl]
761 zonkForeignExports ls = mapNF_Tc zonkForeignExport ls
763 zonkForeignExport :: TcForeignExportDecl -> NF_TcM (TypecheckedForeignDecl)
764 zonkForeignExport (ForeignExport i hs_ty spec isDeprec src_loc) =
765 zonkIdOcc i `thenNF_Tc` \ i' ->
766 returnNF_Tc (ForeignExport i' undefined spec isDeprec src_loc)
770 zonkRules :: [TcRuleDecl] -> NF_TcM [TypecheckedRuleDecl]
771 zonkRules rs = mapNF_Tc zonkRule rs
773 zonkRule (HsRule name act vars lhs rhs loc)
774 = mapNF_Tc zonk_bndr vars `thenNF_Tc` \ new_bndrs ->
775 tcExtendGlobalValEnv (filter isId new_bndrs) $
776 -- Type variables don't need an envt
777 -- They are bound through the mutable mechanism
778 zonkExpr lhs `thenNF_Tc` \ new_lhs ->
779 zonkExpr rhs `thenNF_Tc` \ new_rhs ->
780 returnNF_Tc (HsRule name act (map RuleBndr new_bndrs) new_lhs new_rhs loc)
781 -- I hate this map RuleBndr stuff
783 zonk_bndr (RuleBndr v)
784 | isId v = zonkIdBndr v
785 | otherwise = zonkTcTyVarToTyVar v
787 zonkRule (IfaceRuleOut fun rule)
788 = zonkIdOcc fun `thenNF_Tc` \ fun' ->
789 returnNF_Tc (IfaceRuleOut fun' rule)