2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[RnSource]{Main pass of renamer}
7 module RnSource ( rnDecl, rnTyClDecl, rnIfaceRuleDecl, rnInstDecl, rnSourceDecls,
8 rnHsType, rnHsSigType, rnHsTypeFVs, rnHsSigTypeFVs
11 #include "HsVersions.h"
15 import HscTypes ( GlobalRdrEnv )
16 import HsTypes ( hsTyVarNames, pprHsContext )
17 import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, mkRdrNameWkr, elemRdrEnv )
18 import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl, RdrNameTyClDecl,
19 extractRuleBndrsTyVars, extractHsTyRdrTyVars,
20 extractHsCtxtRdrTyVars, extractGenericPatTyVars
25 import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, renameSigsFVs )
26 import RnEnv ( lookupTopBndrRn, lookupOccRn, newIPName, lookupIfaceName,
27 lookupOrigNames, lookupSysBinder, newLocalsRn,
29 bindTyVarsRn, bindTyVars2Rn,
30 bindTyVarsFV2Rn, extendTyVarEnvFVRn,
31 bindCoreLocalRn, bindCoreLocalsRn, bindLocalNames,
32 checkDupOrQualNames, checkDupNames, mapFvRn
36 import Class ( FunDep, DefMeth (..) )
37 import Name ( Name, OccName, nameOccName, NamedThing(..) )
39 import PrelInfo ( derivableClassKeys, cCallishClassKeys )
40 import PrelNames ( deRefStablePtr_RDR, newStablePtr_RDR,
41 bindIO_RDR, returnIO_RDR
43 import List ( partition, nub )
45 import SrcLoc ( SrcLoc )
46 import CmdLineOpts ( DynFlag(..) )
47 -- Warn of unused for-all'd tyvars
48 import Unique ( Uniquable(..) )
49 import ErrUtils ( Message )
50 import CStrings ( isCLabelString )
51 import ListSetOps ( removeDupsEq )
54 @rnDecl@ `renames' declarations.
55 It simultaneously performs dependency analysis and precedence parsing.
56 It also does the following error checks:
59 Checks that tyvars are used properly. This includes checking
60 for undefined tyvars, and tyvars in contexts that are ambiguous.
61 (Some of this checking has now been moved to module @TcMonoType@,
62 since we don't have functional dependency information at this point.)
64 Checks that all variable occurences are defined.
66 Checks the @(..)@ etc constraints in the export list.
70 %*********************************************************
72 \subsection{Value declarations}
74 %*********************************************************
77 rnSourceDecls :: GlobalRdrEnv -> LocalFixityEnv
79 -> RnMG ([RenamedHsDecl], FreeVars)
80 -- The decls get reversed, but that's ok
82 rnSourceDecls gbl_env local_fixity_env decls
83 = initRnMS gbl_env local_fixity_env SourceMode (go emptyFVs [] decls)
85 -- Fixity and deprecations have been dealt with already; ignore them
86 go fvs ds' [] = returnRn (ds', fvs)
87 go fvs ds' (FixD _:ds) = go fvs ds' ds
88 go fvs ds' (DeprecD _:ds) = go fvs ds' ds
89 go fvs ds' (d:ds) = rnDecl d `thenRn` \(d', fvs') ->
90 go (fvs `plusFV` fvs') (d':ds') ds
94 %*********************************************************
96 \subsection{Value declarations}
98 %*********************************************************
101 -- rnDecl does all the work
102 rnDecl :: RdrNameHsDecl -> RnMS (RenamedHsDecl, FreeVars)
104 rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) ->
105 returnRn (ValD new_binds, fvs)
107 rnDecl (TyClD tycl_decl)
108 = rnTyClDecl tycl_decl `thenRn` \ new_decl ->
109 rnClassBinds tycl_decl new_decl `thenRn` \ (new_decl', fvs) ->
110 returnRn (TyClD new_decl', fvs `plusFV` tyClDeclFVs new_decl')
113 = rnInstDecl inst `thenRn` \ new_inst ->
114 rnInstBinds inst new_inst `thenRn` \ (new_inst', fvs) ->
115 returnRn (InstD new_inst', fvs `plusFV` instDeclFVs new_inst')
118 | isIfaceRuleDecl rule
119 = rnIfaceRuleDecl rule `thenRn` \ new_rule ->
120 returnRn (RuleD new_rule, ruleDeclFVs new_rule)
122 = rnHsRuleDecl rule `thenRn` \ (new_rule, fvs) ->
123 returnRn (RuleD new_rule, fvs)
125 rnDecl (DefD (DefaultDecl tys src_loc))
126 = pushSrcLocRn src_loc $
127 mapFvRn (rnHsTypeFVs doc_str) tys `thenRn` \ (tys', fvs) ->
128 returnRn (DefD (DefaultDecl tys' src_loc), fvs)
130 doc_str = text "a `default' declaration"
132 rnDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc))
133 = pushSrcLocRn src_loc $
134 lookupOccRn name `thenRn` \ name' ->
137 | isDyn = lookupOrigNames [newStablePtr_RDR, deRefStablePtr_RDR,
138 bindIO_RDR, returnIO_RDR]
140 lookupOrigNames [bindIO_RDR, returnIO_RDR] `thenRn` \ fvs ->
141 returnRn (addOneFV fvs name')
142 extra_fvs other = returnRn emptyFVs
144 checkRn (ok_ext_nm ext_nm) (badExtName ext_nm) `thenRn_`
146 extra_fvs imp_exp `thenRn` \ fvs1 ->
148 rnHsTypeFVs fo_decl_msg ty `thenRn` \ (ty', fvs2) ->
149 returnRn (ForD (ForeignDecl name' imp_exp ty' ext_nm cconv src_loc),
152 fo_decl_msg = ptext SLIT("The foreign declaration for") <+> ppr name
153 isDyn = isDynamicExtName ext_nm
155 ok_ext_nm Dynamic = True
156 ok_ext_nm (ExtName nm (Just mb)) = isCLabelString nm && isCLabelString mb
157 ok_ext_nm (ExtName nm Nothing) = isCLabelString nm
161 %*********************************************************
163 \subsection{Instance declarations}
165 %*********************************************************
168 rnInstDecl (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc)
169 = pushSrcLocRn src_loc $
170 rnHsSigType (text "an instance decl") inst_ty `thenRn` \ inst_ty' ->
172 (case maybe_dfun_rdr_name of
173 Nothing -> returnRn Nothing
174 Just dfun_rdr_name -> lookupIfaceName dfun_rdr_name `thenRn` \ dfun_name ->
175 returnRn (Just dfun_name)
176 ) `thenRn` \ maybe_dfun_name ->
178 -- The typechecker checks that all the bindings are for the right class.
179 returnRn (InstDecl inst_ty' EmptyMonoBinds [] maybe_dfun_name src_loc)
181 -- Compare rnClassBinds
182 rnInstBinds (InstDecl _ mbinds uprags _ _ )
183 (InstDecl inst_ty _ _ maybe_dfun_rdr_name src_loc)
185 meth_doc = text "the bindings in an instance declaration"
186 meth_names = collectLocatedMonoBinders mbinds
187 inst_tyvars = case inst_ty of
188 HsForAllTy (Just inst_tyvars) _ _ -> inst_tyvars
190 -- (Slightly strangely) the forall-d tyvars scope over
191 -- the method bindings too
194 -- Rename the bindings
195 -- NB meth_names can be qualified!
196 checkDupNames meth_doc meth_names `thenRn_`
197 extendTyVarEnvFVRn (map hsTyVarName inst_tyvars) (
198 rnMethodBinds [] mbinds
199 ) `thenRn` \ (mbinds', meth_fvs) ->
201 binders = collectMonoBinders mbinds'
202 binder_set = mkNameSet binders
204 -- Rename the prags and signatures.
205 -- Note that the type variables are not in scope here,
206 -- so that instance Eq a => Eq (T a) where
207 -- {-# SPECIALISE instance Eq a => Eq (T [a]) #-}
210 -- But the (unqualified) method names are in scope
211 bindLocalNames binders (
212 renameSigsFVs (okInstDclSig binder_set) uprags
213 ) `thenRn` \ (uprags', prag_fvs) ->
215 returnRn (InstDecl inst_ty mbinds' uprags' maybe_dfun_rdr_name src_loc,
216 meth_fvs `plusFV` prag_fvs)
219 %*********************************************************
223 %*********************************************************
226 rnIfaceRuleDecl (IfaceRule rule_name vars fn args rhs src_loc)
227 = pushSrcLocRn src_loc $
228 lookupOccRn fn `thenRn` \ fn' ->
229 rnCoreBndrs vars $ \ vars' ->
230 mapRn rnCoreExpr args `thenRn` \ args' ->
231 rnCoreExpr rhs `thenRn` \ rhs' ->
232 returnRn (IfaceRule rule_name vars' fn' args' rhs' src_loc)
234 rnHsRuleDecl (HsRule rule_name tvs vars lhs rhs src_loc)
236 pushSrcLocRn src_loc $
238 bindTyVarsFV2Rn doc (map UserTyVar sig_tvs) $ \ sig_tvs' _ ->
239 bindLocalsFVRn doc (map get_var vars) $ \ ids ->
240 mapFvRn rn_var (vars `zip` ids) `thenRn` \ (vars', fv_vars) ->
242 rnExpr lhs `thenRn` \ (lhs', fv_lhs) ->
243 rnExpr rhs `thenRn` \ (rhs', fv_rhs) ->
244 checkRn (validRuleLhs ids lhs')
245 (badRuleLhsErr rule_name lhs') `thenRn_`
247 bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)]
249 mapRn (addErrRn . badRuleVar rule_name) bad_vars `thenRn_`
250 returnRn (HsRule rule_name sig_tvs' vars' lhs' rhs' src_loc,
251 fv_vars `plusFV` fv_lhs `plusFV` fv_rhs)
253 doc = text "the transformation rule" <+> ptext rule_name
254 sig_tvs = extractRuleBndrsTyVars vars
256 get_var (RuleBndr v) = v
257 get_var (RuleBndrSig v _) = v
259 rn_var (RuleBndr v, id) = returnRn (RuleBndr id, emptyFVs)
260 rn_var (RuleBndrSig v t, id) = rnHsTypeFVs doc t `thenRn` \ (t', fvs) ->
261 returnRn (RuleBndrSig id t', fvs)
265 %*********************************************************
267 \subsection{Type, class and iface sig declarations}
269 %*********************************************************
271 @rnTyDecl@ uses the `global name function' to create a new type
272 declaration in which local names have been replaced by their original
273 names, reporting any unknown names.
275 Renaming type variables is a pain. Because they now contain uniques,
276 it is necessary to pass in an association list which maps a parsed
277 tyvar to its @Name@ representation.
278 In some cases (type signatures of values),
279 it is even necessary to go over the type first
280 in order to get the set of tyvars used by it, make an assoc list,
281 and then go over it again to rename the tyvars!
282 However, we can also do some scoping checks at the same time.
285 rnTyClDecl (IfaceSig {tcdName = name, tcdType = ty, tcdIdInfo = id_infos, tcdLoc = loc})
287 lookupTopBndrRn name `thenRn` \ name' ->
288 rnHsType doc_str ty `thenRn` \ ty' ->
289 mapRn rnIdInfo id_infos `thenRn` \ id_infos' ->
290 returnRn (IfaceSig {tcdName = name', tcdType = ty', tcdIdInfo = id_infos', tcdLoc = loc})
292 doc_str = text "the interface signature for" <+> quotes (ppr name)
294 rnTyClDecl (TyData {tcdND = new_or_data, tcdCtxt = context, tcdName = tycon,
295 tcdTyVars = tyvars, tcdCons = condecls, tcdNCons = nconstrs,
296 tcdDerivs = derivings, tcdLoc = src_loc, tcdSysNames = sys_names})
297 = pushSrcLocRn src_loc $
298 lookupTopBndrRn tycon `thenRn` \ tycon' ->
299 bindTyVarsRn data_doc tyvars $ \ tyvars' ->
300 rnContext data_doc context `thenRn` \ context' ->
301 checkDupOrQualNames data_doc con_names `thenRn_`
302 mapRn rnConDecl condecls `thenRn` \ condecls' ->
303 mapRn lookupSysBinder sys_names `thenRn` \ sys_names' ->
304 rnDerivs derivings `thenRn` \ derivings' ->
305 returnRn (TyData {tcdND = new_or_data, tcdCtxt = context', tcdName = tycon',
306 tcdTyVars = tyvars', tcdCons = condecls', tcdNCons = nconstrs,
307 tcdDerivs = derivings', tcdLoc = src_loc, tcdSysNames = sys_names'})
309 data_doc = text "the data type declaration for" <+> quotes (ppr tycon)
310 con_names = map conDeclName condecls
312 rnTyClDecl (TySynonym {tcdName = name, tcdTyVars = tyvars, tcdSynRhs = ty, tcdLoc = src_loc})
313 = pushSrcLocRn src_loc $
314 doptRn Opt_GlasgowExts `thenRn` \ glaExts ->
315 lookupTopBndrRn name `thenRn` \ name' ->
316 bindTyVarsRn syn_doc tyvars $ \ tyvars' ->
317 rnHsType syn_doc (unquantify glaExts ty) `thenRn` \ ty' ->
318 returnRn (TySynonym {tcdName = name', tcdTyVars = tyvars', tcdSynRhs = ty', tcdLoc = src_loc})
320 syn_doc = text "the declaration for type synonym" <+> quotes (ppr name)
322 -- For H98 we do *not* universally quantify on the RHS of a synonym
323 -- Silently discard context... but the tyvars in the rest won't be in scope
324 unquantify glaExts (HsForAllTy Nothing ctxt ty) | glaExts = ty
325 unquantify glaExys ty = ty
327 rnTyClDecl (ClassDecl {tcdCtxt = context, tcdName = cname,
328 tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs,
329 tcdSysNames = names, tcdLoc = src_loc})
330 = pushSrcLocRn src_loc $
332 lookupTopBndrRn cname `thenRn` \ cname' ->
334 -- Deal with the implicit tycon and datacon name
335 -- They aren't in scope (because they aren't visible to the user)
336 -- and what we want to do is simply look them up in the cache;
337 -- we jolly well ought to get a 'hit' there!
338 mapRn lookupSysBinder names `thenRn` \ names' ->
340 -- Tyvars scope over bindings and context
341 bindTyVars2Rn cls_doc tyvars $ \ clas_tyvar_names tyvars' ->
343 -- Check the superclasses
344 rnContext cls_doc context `thenRn` \ context' ->
346 -- Check the functional dependencies
347 rnFds cls_doc fds `thenRn` \ fds' ->
349 -- Check the signatures
350 -- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs).
352 (op_sigs, non_op_sigs) = partition isClassOpSig sigs
353 sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs]
355 checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_`
356 mapRn (rnClassOp cname' clas_tyvar_names fds') op_sigs `thenRn` \ sigs' ->
358 binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ]
360 renameSigs (okClsDclSig binders) non_op_sigs `thenRn` \ non_ops' ->
362 -- Typechecker is responsible for checking that we only
363 -- give default-method bindings for things in this class.
364 -- The renamer *could* check this for class decls, but can't
365 -- for instance decls.
367 returnRn (ClassDecl { tcdCtxt = context', tcdName = cname', tcdTyVars = tyvars',
368 tcdFDs = fds', tcdSigs = non_ops' ++ sigs', tcdMeths = Nothing,
369 tcdSysNames = names', tcdLoc = src_loc})
371 cls_doc = text "the declaration for class" <+> ppr cname
372 sig_doc = text "the signatures for class" <+> ppr cname
374 rnClassOp clas clas_tyvars clas_fds sig@(ClassOpSig op dm_stuff ty locn)
375 = pushSrcLocRn locn $
376 lookupTopBndrRn op `thenRn` \ op_name ->
378 -- Check the signature
379 rnHsSigType (quotes (ppr op)) ty `thenRn` \ new_ty ->
381 -- Make the default-method name
384 -> -- Imported class that has a default method decl
385 -- See comments with tname, snames, above
386 lookupSysBinder dm_rdr_name `thenRn` \ dm_name ->
387 returnRn (DefMeth dm_name)
388 -- An imported class decl for a class decl that had an explicit default
389 -- method, mentions, rather than defines,
390 -- the default method, so we must arrange to pull it in
392 GenDefMeth -> returnRn GenDefMeth
393 NoDefMeth -> returnRn NoDefMeth
394 ) `thenRn` \ dm_stuff' ->
396 returnRn (ClassOpSig op_name dm_stuff' new_ty locn)
398 rnClassBinds :: RdrNameTyClDecl -> RenamedTyClDecl -> RnMS (RenamedTyClDecl, FreeVars)
399 -- Rename the mbinds only; the rest is done already
400 rnClassBinds (ClassDecl {tcdMeths = Nothing}) rn_cls_decl
401 = returnRn (rn_cls_decl, emptyFVs) -- No meth binds; decl came from interface file
403 rnClassBinds (ClassDecl {tcdMeths = Just mbinds}) -- Get mbinds from here
404 rn_cls_decl@(ClassDecl {tcdTyVars = tyvars, tcdLoc = src_loc}) -- Everything else is here
405 = -- The newLocals call is tiresome: given a generic class decl
408 -- op {| x+y |} (Inl a) = ...
409 -- op {| x+y |} (Inr b) = ...
410 -- op {| a*b |} (a*b) = ...
411 -- we want to name both "x" tyvars with the same unique, so that they are
412 -- easy to group together in the typechecker.
414 extendTyVarEnvFVRn (map hsTyVarName tyvars) $
415 getLocalNameEnv `thenRn` \ name_env ->
417 meth_rdr_names_w_locs = collectLocatedMonoBinders mbinds
418 gen_rdr_tyvars_w_locs = [(tv,src_loc) | tv <- extractGenericPatTyVars mbinds,
419 not (tv `elemRdrEnv` name_env)]
421 checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_`
422 newLocalsRn gen_rdr_tyvars_w_locs `thenRn` \ gen_tyvars ->
423 rnMethodBinds gen_tyvars mbinds `thenRn` \ (mbinds', meth_fvs) ->
424 returnRn (rn_cls_decl {tcdMeths = Just mbinds'}, meth_fvs)
426 meth_doc = text "the default-methods for class" <+> ppr (tcdName rn_cls_decl)
428 rnClassBinds _ tycl_decl = returnRn (tycl_decl, emptyFVs)
429 -- Not a class declaration
433 %*********************************************************
435 \subsection{Support code for type/data declarations}
437 %*********************************************************
440 rnDerivs :: Maybe [RdrName] -> RnMS (Maybe [Name])
442 rnDerivs Nothing -- derivs not specified
446 = mapRn do_one clss `thenRn` \ clss' ->
447 returnRn (Just clss')
449 do_one cls = lookupOccRn cls `thenRn` \ clas_name ->
450 checkRn (getUnique clas_name `elem` derivableClassKeys)
451 (derivingNonStdClassErr clas_name) `thenRn_`
456 conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc)
457 conDeclName (ConDecl n _ _ _ _ l) = (n,l)
459 rnConDecl :: RdrNameConDecl -> RnMS RenamedConDecl
460 rnConDecl (ConDecl name wkr tvs cxt details locn)
461 = pushSrcLocRn locn $
462 checkConName name `thenRn_`
463 lookupTopBndrRn name `thenRn` \ new_name ->
465 lookupSysBinder wkr `thenRn` \ new_wkr ->
466 -- See comments with ClassDecl
468 bindTyVarsRn doc tvs $ \ new_tyvars ->
469 rnContext doc cxt `thenRn` \ new_context ->
470 rnConDetails doc locn details `thenRn` \ new_details ->
471 returnRn (ConDecl new_name new_wkr new_tyvars new_context new_details locn)
473 doc = text "the definition of data constructor" <+> quotes (ppr name)
475 rnConDetails doc locn (VanillaCon tys)
476 = mapRn (rnBangTy doc) tys `thenRn` \ new_tys ->
477 returnRn (VanillaCon new_tys)
479 rnConDetails doc locn (InfixCon ty1 ty2)
480 = rnBangTy doc ty1 `thenRn` \ new_ty1 ->
481 rnBangTy doc ty2 `thenRn` \ new_ty2 ->
482 returnRn (InfixCon new_ty1 new_ty2)
484 rnConDetails doc locn (RecCon fields)
485 = checkDupOrQualNames doc field_names `thenRn_`
486 mapRn (rnField doc) fields `thenRn` \ new_fields ->
487 returnRn (RecCon new_fields)
489 field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds]
491 rnField doc (names, ty)
492 = mapRn lookupTopBndrRn names `thenRn` \ new_names ->
493 rnBangTy doc ty `thenRn` \ new_ty ->
494 returnRn (new_names, new_ty)
496 rnBangTy doc (Banged ty)
497 = rnHsType doc ty `thenRn` \ new_ty ->
498 returnRn (Banged new_ty)
500 rnBangTy doc (Unbanged ty)
501 = rnHsType doc ty `thenRn` \ new_ty ->
502 returnRn (Unbanged new_ty)
504 rnBangTy doc (Unpacked ty)
505 = rnHsType doc ty `thenRn` \ new_ty ->
506 returnRn (Unpacked new_ty)
508 -- This data decl will parse OK
510 -- treating "a" as the constructor.
511 -- It is really hard to make the parser spot this malformation.
512 -- So the renamer has to check that the constructor is legal
514 -- We can get an operator as the constructor, even in the prefix form:
515 -- data T = :% Int Int
516 -- from interface files, which always print in prefix form
519 = checkRn (isRdrDataCon name)
524 %*********************************************************
526 \subsection{Support code to rename types}
528 %*********************************************************
531 rnHsTypeFVs :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
532 rnHsTypeFVs doc_str ty
533 = rnHsType doc_str ty `thenRn` \ ty' ->
534 returnRn (ty', extractHsTyNames ty')
536 rnHsSigTypeFVs :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
537 rnHsSigTypeFVs doc_str ty
538 = rnHsSigType doc_str ty `thenRn` \ ty' ->
539 returnRn (ty', extractHsTyNames ty')
541 rnHsSigType :: SDoc -> RdrNameHsType -> RnMS RenamedHsType
542 -- rnHsSigType is used for source-language type signatures,
543 -- which use *implicit* universal quantification.
544 rnHsSigType doc_str ty
545 = rnHsType (text "the type signature for" <+> doc_str) ty
547 ---------------------------------------
548 rnHsType :: SDoc -> RdrNameHsType -> RnMS RenamedHsType
550 rnHsType doc (HsForAllTy Nothing ctxt ty)
551 -- Implicit quantifiction in source code (no kinds on tyvars)
552 -- Given the signature C => T we universally quantify
553 -- over FV(T) \ {in-scope-tyvars}
554 = getLocalNameEnv `thenRn` \ name_env ->
556 mentioned_in_tau = extractHsTyRdrTyVars ty
557 mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt
558 mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt)
559 forall_tyvars = filter (not . (`elemRdrEnv` name_env)) mentioned
561 rnForAll doc (map UserTyVar forall_tyvars) ctxt ty
563 rnHsType doc (HsForAllTy (Just forall_tyvars) ctxt tau)
564 -- Explicit quantification.
565 -- Check that the forall'd tyvars are actually
566 -- mentioned in the type, and produce a warning if not
568 mentioned_in_tau = extractHsTyRdrTyVars tau
569 mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt
570 mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt)
571 forall_tyvar_names = hsTyVarNames forall_tyvars
573 -- Explicitly quantified but not mentioned in ctxt or tau
574 warn_guys = filter (`notElem` mentioned) forall_tyvar_names
576 mapRn_ (forAllWarn doc tau) warn_guys `thenRn_`
577 rnForAll doc forall_tyvars ctxt tau
579 rnHsType doc (HsTyVar tyvar)
580 = lookupOccRn tyvar `thenRn` \ tyvar' ->
581 returnRn (HsTyVar tyvar')
583 rnHsType doc (HsOpTy ty1 opname ty2)
584 = lookupOccRn opname `thenRn` \ name' ->
585 rnHsType doc ty1 `thenRn` \ ty1' ->
586 rnHsType doc ty2 `thenRn` \ ty2' ->
587 returnRn (HsOpTy ty1' name' ty2')
589 rnHsType doc (HsNumTy i)
590 | i == 1 = returnRn (HsNumTy i)
591 | otherwise = failWithRn (HsNumTy i)
592 (ptext SLIT("Only unit numeric type pattern is valid"))
594 rnHsType doc (HsFunTy ty1 ty2)
595 = rnHsType doc ty1 `thenRn` \ ty1' ->
596 -- Might find a for-all as the arg of a function type
597 rnHsType doc ty2 `thenRn` \ ty2' ->
598 -- Or as the result. This happens when reading Prelude.hi
599 -- when we find return :: forall m. Monad m -> forall a. a -> m a
600 returnRn (HsFunTy ty1' ty2')
602 rnHsType doc (HsListTy ty)
603 = rnHsType doc ty `thenRn` \ ty' ->
604 returnRn (HsListTy ty')
606 -- Unboxed tuples are allowed to have poly-typed arguments. These
607 -- sometimes crop up as a result of CPR worker-wrappering dictionaries.
608 rnHsType doc (HsTupleTy (HsTupCon _ boxity) tys)
609 -- Don't do lookupOccRn, because this is built-in syntax
610 -- so it doesn't need to be in scope
611 = mapRn (rnHsType doc) tys `thenRn` \ tys' ->
612 returnRn (HsTupleTy (HsTupCon n' boxity) tys')
614 n' = tupleTyCon_name boxity (length tys)
617 rnHsType doc (HsAppTy ty1 ty2)
618 = rnHsType doc ty1 `thenRn` \ ty1' ->
619 rnHsType doc ty2 `thenRn` \ ty2' ->
620 returnRn (HsAppTy ty1' ty2')
622 rnHsType doc (HsPredTy pred)
623 = rnPred doc pred `thenRn` \ pred' ->
624 returnRn (HsPredTy pred')
626 rnHsTypes doc tys = mapRn (rnHsType doc) tys
630 -- We use lookupOcc here because this is interface file only stuff
631 -- and we need the workers...
632 rnHsTupCon (HsTupCon n boxity)
633 = lookupOccRn n `thenRn` \ n' ->
634 returnRn (HsTupCon n' boxity)
636 rnHsTupConWkr (HsTupCon n boxity)
637 -- Tuple construtors are for the *worker* of the tuple
638 -- Going direct saves needless messing about
639 = lookupOccRn (mkRdrNameWkr n) `thenRn` \ n' ->
640 returnRn (HsTupCon n' boxity)
644 rnForAll doc forall_tyvars ctxt ty
645 = bindTyVarsRn doc forall_tyvars $ \ new_tyvars ->
646 rnContext doc ctxt `thenRn` \ new_ctxt ->
647 rnHsType doc ty `thenRn` \ new_ty ->
648 returnRn (mkHsForAllTy (Just new_tyvars) new_ctxt new_ty)
652 rnContext :: SDoc -> RdrNameContext -> RnMS RenamedContext
654 = mapRn rn_pred ctxt `thenRn` \ theta ->
656 (_, dups) = removeDupsEq theta
657 -- We only have equality, not ordering
659 -- Check for duplicate assertions
660 -- If this isn't an error, then it ought to be:
661 mapRn (addWarnRn . dupClassAssertWarn theta) dups `thenRn_`
664 --Someone discovered that @CCallable@ and @CReturnable@
665 -- could be used in contexts such as:
666 -- foo :: CCallable a => a -> PrimIO Int
667 -- Doing this utterly wrecks the whole point of introducing these
668 -- classes so we specifically check that this isn't being done.
669 rn_pred pred = rnPred doc pred `thenRn` \ pred'->
670 checkRn (not (bad_pred pred'))
671 (naughtyCCallContextErr pred') `thenRn_`
674 bad_pred (HsPClass clas _) = getUnique clas `elem` cCallishClassKeys
675 bad_pred other = False
678 rnPred doc (HsPClass clas tys)
679 = lookupOccRn clas `thenRn` \ clas_name ->
680 rnHsTypes doc tys `thenRn` \ tys' ->
681 returnRn (HsPClass clas_name tys')
683 rnPred doc (HsPIParam n ty)
684 = newIPName n `thenRn` \ name ->
685 rnHsType doc ty `thenRn` \ ty' ->
686 returnRn (HsPIParam name ty')
690 rnFds :: SDoc -> [FunDep RdrName] -> RnMS [FunDep Name]
696 = rnHsTyVars doc tys1 `thenRn` \ tys1' ->
697 rnHsTyVars doc tys2 `thenRn` \ tys2' ->
698 returnRn (tys1', tys2')
700 rnHsTyVars doc tvs = mapRn (rnHsTyvar doc) tvs
701 rnHsTyvar doc tyvar = lookupOccRn tyvar
704 %*********************************************************
708 %*********************************************************
711 rnIdInfo (HsWorker worker)
712 = lookupOccRn worker `thenRn` \ worker' ->
713 returnRn (HsWorker worker')
715 rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ expr' ->
716 returnRn (HsUnfold inline expr')
717 rnIdInfo (HsStrictness str) = returnRn (HsStrictness str)
718 rnIdInfo (HsArity arity) = returnRn (HsArity arity)
719 rnIdInfo HsNoCafRefs = returnRn HsNoCafRefs
720 rnIdInfo HsCprInfo = returnRn HsCprInfo
723 @UfCore@ expressions.
726 rnCoreExpr (UfType ty)
727 = rnHsType (text "unfolding type") ty `thenRn` \ ty' ->
728 returnRn (UfType ty')
731 = lookupOccRn v `thenRn` \ v' ->
737 rnCoreExpr (UfLitLit l ty)
738 = rnHsType (text "litlit") ty `thenRn` \ ty' ->
739 returnRn (UfLitLit l ty')
741 rnCoreExpr (UfCCall cc ty)
742 = rnHsType (text "ccall") ty `thenRn` \ ty' ->
743 returnRn (UfCCall cc ty')
745 rnCoreExpr (UfTuple con args)
746 = rnHsTupConWkr con `thenRn` \ con' ->
747 mapRn rnCoreExpr args `thenRn` \ args' ->
748 returnRn (UfTuple con' args')
750 rnCoreExpr (UfApp fun arg)
751 = rnCoreExpr fun `thenRn` \ fun' ->
752 rnCoreExpr arg `thenRn` \ arg' ->
753 returnRn (UfApp fun' arg')
755 rnCoreExpr (UfCase scrut bndr alts)
756 = rnCoreExpr scrut `thenRn` \ scrut' ->
757 bindCoreLocalRn bndr $ \ bndr' ->
758 mapRn rnCoreAlt alts `thenRn` \ alts' ->
759 returnRn (UfCase scrut' bndr' alts')
761 rnCoreExpr (UfNote note expr)
762 = rnNote note `thenRn` \ note' ->
763 rnCoreExpr expr `thenRn` \ expr' ->
764 returnRn (UfNote note' expr')
766 rnCoreExpr (UfLam bndr body)
767 = rnCoreBndr bndr $ \ bndr' ->
768 rnCoreExpr body `thenRn` \ body' ->
769 returnRn (UfLam bndr' body')
771 rnCoreExpr (UfLet (UfNonRec bndr rhs) body)
772 = rnCoreExpr rhs `thenRn` \ rhs' ->
773 rnCoreBndr bndr $ \ bndr' ->
774 rnCoreExpr body `thenRn` \ body' ->
775 returnRn (UfLet (UfNonRec bndr' rhs') body')
777 rnCoreExpr (UfLet (UfRec pairs) body)
778 = rnCoreBndrs bndrs $ \ bndrs' ->
779 mapRn rnCoreExpr rhss `thenRn` \ rhss' ->
780 rnCoreExpr body `thenRn` \ body' ->
781 returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body')
783 (bndrs, rhss) = unzip pairs
787 rnCoreBndr (UfValBinder name ty) thing_inside
788 = rnHsType doc ty `thenRn` \ ty' ->
789 bindCoreLocalRn name $ \ name' ->
790 thing_inside (UfValBinder name' ty')
792 doc = text "unfolding id"
794 rnCoreBndr (UfTyBinder name kind) thing_inside
795 = bindCoreLocalRn name $ \ name' ->
796 thing_inside (UfTyBinder name' kind)
798 rnCoreBndrs [] thing_inside = thing_inside []
799 rnCoreBndrs (b:bs) thing_inside = rnCoreBndr b $ \ name' ->
800 rnCoreBndrs bs $ \ names' ->
801 thing_inside (name':names')
805 rnCoreAlt (con, bndrs, rhs)
806 = rnUfCon con bndrs `thenRn` \ con' ->
807 bindCoreLocalsRn bndrs $ \ bndrs' ->
808 rnCoreExpr rhs `thenRn` \ rhs' ->
809 returnRn (con', bndrs', rhs')
812 = rnHsType (text "unfolding coerce") ty `thenRn` \ ty' ->
813 returnRn (UfCoerce ty')
815 rnNote (UfSCC cc) = returnRn (UfSCC cc)
816 rnNote UfInlineCall = returnRn UfInlineCall
817 rnNote UfInlineMe = returnRn UfInlineMe
823 rnUfCon (UfTupleAlt tup_con) bndrs
824 = rnHsTupCon tup_con `thenRn` \ (HsTupCon con' _) ->
825 returnRn (UfDataAlt con')
826 -- Makes the type checker a little easier
828 rnUfCon (UfDataAlt con) _
829 = lookupOccRn con `thenRn` \ con' ->
830 returnRn (UfDataAlt con')
832 rnUfCon (UfLitAlt lit) _
833 = returnRn (UfLitAlt lit)
835 rnUfCon (UfLitLitAlt lit ty) _
836 = rnHsType (text "litlit") ty `thenRn` \ ty' ->
837 returnRn (UfLitLitAlt lit ty')
840 %*********************************************************
842 \subsection{Rule shapes}
844 %*********************************************************
846 Check the shape of a transformation rule LHS. Currently
847 we only allow LHSs of the form @(f e1 .. en)@, where @f@ is
848 not one of the @forall@'d variables.
851 validRuleLhs foralls lhs
854 check (HsApp e1 e2) = check e1
855 check (HsVar v) | v `notElem` foralls = True
860 %*********************************************************
864 %*********************************************************
867 derivingNonStdClassErr clas
868 = hsep [ptext SLIT("non-standard class"), ppr clas, ptext SLIT("in deriving clause")]
871 = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)]
873 forAllWarn doc ty tyvar
874 = doptRn Opt_WarnUnusedMatches `thenRn` \ warn_unused -> case () of
875 () | not warn_unused -> returnRn ()
877 -> getModeRn `thenRn` \ mode ->
880 InterfaceMode -> returnRn () ; -- Don't warn of unused tyvars in interface files
881 -- unless DEBUG is on, in which case it is slightly
882 -- informative. They can arise from mkRhsTyLam,
883 #endif -- leading to (say) f :: forall a b. [b] -> [b]
886 sep [ptext SLIT("The universally quantified type variable") <+> quotes (ppr tyvar),
887 nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))]
889 (ptext SLIT("In") <+> doc)
893 badRuleLhsErr name lhs
894 = sep [ptext SLIT("Rule") <+> ptext name <> colon,
895 nest 4 (ptext SLIT("Illegal left-hand side:") <+> ppr lhs)]
897 ptext SLIT("LHS must be of form (f e1 .. en) where f is not forall'd")
900 = sep [ptext SLIT("Rule") <+> ptext name <> colon,
901 ptext SLIT("Forall'd variable") <+> quotes (ppr var) <+>
902 ptext SLIT("does not appear on left hand side")]
904 badExtName :: ExtName -> Message
906 = sep [quotes (ppr ext_nm) <+> ptext SLIT("is not a valid C identifier")]
908 dupClassAssertWarn ctxt (assertion : dups)
909 = sep [hsep [ptext SLIT("Duplicate class assertion"),
910 quotes (ppr assertion),
911 ptext SLIT("in the context:")],
912 nest 4 (pprHsContext ctxt <+> ptext SLIT("..."))]
914 naughtyCCallContextErr (HsPClass clas _)
915 = sep [ptext SLIT("Can't use class") <+> quotes (ppr clas),
916 ptext SLIT("in a context")]