2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[RnSource]{Main pass of renamer}
8 rnSrcDecls, checkModDeprec,
9 rnTyClDecl, rnIfaceRuleDecl, rnInstDecl,
10 rnBinds, rnBindsAndThen, rnStats,
13 #include "HsVersions.h"
16 import RdrName ( RdrName, isRdrDataCon, elemRdrEnv )
17 import RdrHsSyn ( RdrNameConDecl, RdrNameTyClDecl,
18 RdrNameDeprecation, RdrNameFixitySig,
20 extractGenericPatTyVars
24 import RnExpr ( rnExpr )
25 import RnTypes ( rnHsType, rnHsSigType, rnHsTypeFVs, rnContext )
27 import RnBinds ( rnTopMonoBinds, rnMonoBinds, rnMethodBinds,
28 rnMonoBindsAndThen, renameSigs, checkSigs )
29 import RnEnv ( lookupTopBndrRn, lookupOccRn, lookupSysBndr,
30 newLocalsRn, lookupGlobalOccRn,
31 bindLocalsFV, bindPatSigTyVarsFV,
32 bindTyVarsRn, extendTyVarEnvFVRn,
33 bindCoreLocalRn, bindCoreLocalsRn, bindLocalNames,
34 checkDupOrQualNames, checkDupNames, mapFvRn,
35 lookupTopSrcBndr_maybe, lookupTopSrcBndr,
36 dataTcOccs, newIPName, unknownNameErr
40 import BasicTypes ( FixitySig(..), TopLevelFlag(..) )
41 import HscTypes ( ExternalPackageState(..), FixityEnv,
42 Deprecations(..), plusDeprecs )
43 import Module ( moduleEnvElts )
44 import Class ( FunDep, DefMeth (..) )
45 import TyCon ( DataConDetails(..), visibleDataCons )
49 import ErrUtils ( dumpIfSet )
50 import PrelNames ( newStablePtrName, bindIOName, returnIOName
53 , unmarshalObjectName, marshalObjectName
54 , unmarshalStringName, marshalStringName
57 import List ( partition )
58 import Bag ( bagToList )
60 import SrcLoc ( SrcLoc )
61 import CmdLineOpts ( DynFlag(..) )
62 -- Warn of unused for-all'd tyvars
63 import Maybes ( maybeToBool, seqMaybe )
64 import Maybe ( maybe, catMaybes, isNothing )
67 @rnSourceDecl@ `renames' declarations.
68 It simultaneously performs dependency analysis and precedence parsing.
69 It also does the following error checks:
72 Checks that tyvars are used properly. This includes checking
73 for undefined tyvars, and tyvars in contexts that are ambiguous.
74 (Some of this checking has now been moved to module @TcMonoType@,
75 since we don't have functional dependency information at this point.)
77 Checks that all variable occurences are defined.
79 Checks the @(..)@ etc constraints in the export list.
84 rnSrcDecls :: HsGroup RdrName -> RnM (TcGblEnv, HsGroup Name, DefUses)
86 rnSrcDecls (HsGroup { hs_valds = MonoBind binds sigs _,
87 hs_tyclds = tycl_decls,
88 hs_instds = inst_decls,
90 hs_depds = deprec_decls,
91 hs_fords = foreign_decls,
92 hs_defds = default_decls,
93 hs_ruleds = rule_decls,
94 hs_coreds = core_decls })
96 = do { -- Deal with deprecations (returns only the extra deprecations)
97 deprecs <- rnSrcDeprecDecls deprec_decls ;
98 updGblEnv (\gbl -> gbl { tcg_deprecs = tcg_deprecs gbl `plusDeprecs` deprecs })
101 -- Deal with top-level fixity decls
102 -- (returns the total new fixity env)
103 fix_env <- rnSrcFixityDecls fix_decls ;
104 updGblEnv (\gbl -> gbl { tcg_fix_env = fix_env })
107 -- Rename other declarations
108 (rn_val_decls, bind_dus) <- rnTopMonoBinds binds sigs ;
110 -- You might think that we could build proper def/use information
111 -- for type and class declarations, but they can be involved
112 -- in mutual recursion across modules, and we only do the SCC
113 -- analysis for them in the type checker.
114 -- So we content ourselves with gathering uses only; that
115 -- means we'll only report a declaration as unused if it isn't
116 -- mentioned at all. Ah well.
117 (rn_tycl_decls, src_fvs1) <- mapFvRn rnSrcTyClDecl tycl_decls ;
118 (rn_inst_decls, src_fvs2) <- mapFvRn rnSrcInstDecl inst_decls ;
119 (rn_rule_decls, src_fvs3) <- mapFvRn rnHsRuleDecl rule_decls ;
120 (rn_foreign_decls, src_fvs4) <- mapFvRn rnHsForeignDecl foreign_decls ;
121 (rn_default_decls, src_fvs5) <- mapFvRn rnDefaultDecl default_decls ;
122 (rn_core_decls, src_fvs6) <- mapFvRn rnCoreDecl core_decls ;
125 rn_group = HsGroup { hs_valds = rn_val_decls,
126 hs_tyclds = rn_tycl_decls,
127 hs_instds = rn_inst_decls,
130 hs_fords = rn_foreign_decls,
131 hs_defds = rn_default_decls,
132 hs_ruleds = rn_rule_decls,
133 hs_coreds = rn_core_decls } ;
135 other_fvs = plusFVs [src_fvs1, src_fvs2, src_fvs3,
136 src_fvs4, src_fvs5, src_fvs6] ;
137 src_dus = bind_dus `plusDU` usesOnly other_fvs
140 tcg_env <- getGblEnv ;
141 return (tcg_env, rn_group, src_dus)
146 %*********************************************************
148 Source-code fixity declarations
150 %*********************************************************
153 rnSrcFixityDecls :: [RdrNameFixitySig] -> TcRn m FixityEnv
154 rnSrcFixityDecls fix_decls
155 = getGblEnv `thenM` \ gbl_env ->
156 foldlM rnFixityDecl (tcg_fix_env gbl_env)
157 fix_decls `thenM` \ fix_env ->
158 traceRn (text "fixity env" <+> ppr fix_env) `thenM_`
161 rnFixityDecl :: FixityEnv -> RdrNameFixitySig -> TcRn m FixityEnv
162 rnFixityDecl fix_env (FixitySig rdr_name fixity loc)
163 = -- GHC extension: look up both the tycon and data con
164 -- for con-like things
165 -- If neither are in scope, report an error; otherwise
166 -- add both to the fixity env
167 mappM lookupTopSrcBndr_maybe (dataTcOccs rdr_name) `thenM` \ maybe_ns ->
168 case catMaybes maybe_ns of
169 [] -> addSrcLoc loc $
170 addErr (unknownNameErr rdr_name) `thenM_`
172 ns -> foldlM add fix_env ns
175 = case lookupNameEnv fix_env name of
176 Just (FixitySig _ _ loc') -> addErr (dupFixityDecl rdr_name loc loc') `thenM_`
178 Nothing -> returnM (extendNameEnv fix_env name (FixitySig name fixity loc))
180 dupFixityDecl rdr_name loc1 loc2
181 = vcat [ptext SLIT("Multiple fixity declarations for") <+> quotes (ppr rdr_name),
182 ptext SLIT("at ") <+> ppr loc1,
183 ptext SLIT("and") <+> ppr loc2]
187 %*********************************************************
189 Source-code deprecations declarations
191 %*********************************************************
193 For deprecations, all we do is check that the names are in scope.
194 It's only imported deprecations, dealt with in RnIfaces, that we
195 gather them together.
198 rnSrcDeprecDecls :: [RdrNameDeprecation] -> TcRn m Deprecations
202 rnSrcDeprecDecls decls
203 = mappM rn_deprec decls `thenM` \ pairs ->
204 returnM (DeprecSome (mkNameEnv (catMaybes pairs)))
206 rn_deprec (Deprecation rdr_name txt loc)
208 lookupTopSrcBndr rdr_name `thenM` \ name ->
209 returnM (Just (name, (name,txt)))
211 checkModDeprec :: Maybe DeprecTxt -> Deprecations
212 -- Check for a module deprecation; done once at top level
213 checkModDeprec Nothing = NoDeprecs
214 checkModdeprec (Just txt) = DeprecAll txt
217 = sep [ptext SLIT("Illegal deprecation when whole module is deprecated"),
221 %*********************************************************
223 \subsection{Source code declarations}
225 %*********************************************************
228 rnSrcTyClDecl tycl_decl
229 = rnTyClDecl tycl_decl `thenM` \ new_decl ->
230 finishSourceTyClDecl tycl_decl new_decl `thenM` \ (new_decl', fvs) ->
231 returnM (new_decl', fvs `plusFV` tyClDeclFVs new_decl')
234 = rnInstDecl inst `thenM` \ new_inst ->
235 finishSourceInstDecl inst new_inst `thenM` \ (new_inst', fvs) ->
236 returnM (new_inst', fvs `plusFV` instDeclFVs new_inst')
238 rnDefaultDecl (DefaultDecl tys src_loc)
239 = addSrcLoc src_loc $
240 mapFvRn (rnHsTypeFVs doc_str) tys `thenM` \ (tys', fvs) ->
241 returnM (DefaultDecl tys' src_loc, fvs)
243 doc_str = text "In a `default' declaration"
246 rnCoreDecl (CoreDecl name ty rhs loc)
248 lookupTopBndrRn name `thenM` \ name' ->
249 rnHsTypeFVs doc_str ty `thenM` \ (ty', ty_fvs) ->
250 rnCoreExpr rhs `thenM` \ rhs' ->
251 returnM (CoreDecl name' ty' rhs' loc,
252 ty_fvs `plusFV` ufExprFVs rhs')
254 doc_str = text "In the Core declaration for" <+> quotes (ppr name)
257 %*********************************************************
261 %*********************************************************
263 These chaps are here, rather than in TcBinds, so that there
264 is just one hi-boot file (for RnSource). rnSrcDecls is part
265 of the loop too, and it must be defined in this module.
268 rnBinds :: RdrNameHsBinds -> RnM (RenamedHsBinds, DefUses)
269 -- This version assumes that the binders are already in scope
270 -- It's used only in 'mdo'
271 rnBinds EmptyBinds = returnM (EmptyBinds, emptyDUs)
272 rnBinds (MonoBind bind sigs _) = rnMonoBinds NotTopLevel bind sigs
273 rnBinds b@(IPBinds bind) = addErr (badIpBinds b) `thenM_`
274 returnM (EmptyBinds, emptyDUs)
276 rnBindsAndThen :: RdrNameHsBinds
277 -> (RenamedHsBinds -> RnM (result, FreeVars))
278 -> RnM (result, FreeVars)
279 -- This version (a) assumes that the binding vars are not already in scope
280 -- (b) removes the binders from the free vars of the thing inside
281 -- The parser doesn't produce ThenBinds
282 rnBindsAndThen EmptyBinds thing_inside = thing_inside EmptyBinds
283 rnBindsAndThen (MonoBind bind sigs _) thing_inside = rnMonoBindsAndThen bind sigs thing_inside
284 rnBindsAndThen (IPBinds binds) thing_inside
285 = rnIPBinds binds `thenM` \ (binds',fv_binds) ->
286 thing_inside (IPBinds binds') `thenM` \ (thing, fvs_thing) ->
287 returnM (thing, fvs_thing `plusFV` fv_binds)
291 %************************************************************************
293 \subsubsection{@rnIPBinds@s: in implicit parameter bindings} *
295 %************************************************************************
298 rnIPBinds [] = returnM ([], emptyFVs)
299 rnIPBinds ((n, expr) : binds)
300 = newIPName n `thenM` \ name ->
301 rnExpr expr `thenM` \ (expr',fvExpr) ->
302 rnIPBinds binds `thenM` \ (binds',fvBinds) ->
303 returnM ((name, expr') : binds', fvExpr `plusFV` fvBinds)
307 %*********************************************************
309 \subsection{Foreign declarations}
311 %*********************************************************
314 rnHsForeignDecl (ForeignImport name ty spec isDeprec src_loc)
315 = addSrcLoc src_loc $
316 lookupTopBndrRn name `thenM` \ name' ->
317 rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) ->
318 returnM (ForeignImport name' ty' spec isDeprec src_loc,
319 fvs `plusFV` extras spec)
321 extras (CImport _ _ _ _ CWrapper)
322 = mkFVs [ newStablePtrName
329 , unmarshalObjectName
332 , unmarshalStringName
337 rnHsForeignDecl (ForeignExport name ty spec isDeprec src_loc)
338 = addSrcLoc src_loc $
339 lookupOccRn name `thenM` \ name' ->
340 rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) ->
341 returnM (ForeignExport name' ty' spec isDeprec src_loc,
342 mkFVs [name', bindIOName, returnIOName] `plusFV` fvs )
343 -- NB: a foreign export is an *occurrence site* for name, so
344 -- we add it to the free-variable list. It might, for example,
345 -- be imported from another module
347 fo_decl_msg name = ptext SLIT("In the foreign declaration for") <+> ppr name
351 %*********************************************************
353 \subsection{Instance declarations}
355 %*********************************************************
358 rnInstDecl (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc)
359 -- Used for both source and interface file decls
360 = addSrcLoc src_loc $
361 rnHsSigType (text "an instance decl") inst_ty `thenM` \ inst_ty' ->
363 (case maybe_dfun_rdr_name of
364 Nothing -> returnM Nothing
365 Just dfun_rdr_name -> lookupGlobalOccRn dfun_rdr_name `thenM` \ dfun_name ->
366 returnM (Just dfun_name)
367 ) `thenM` \ maybe_dfun_name ->
369 -- The typechecker checks that all the bindings are for the right class.
370 returnM (InstDecl inst_ty' EmptyMonoBinds [] maybe_dfun_name src_loc)
372 -- Compare finishSourceTyClDecl
373 finishSourceInstDecl (InstDecl _ mbinds uprags _ _ )
374 (InstDecl inst_ty _ _ maybe_dfun_name src_loc)
375 -- Used for both source decls only
376 = ASSERT( not (maybeToBool maybe_dfun_name) ) -- Source decl!
378 meth_doc = text "In the bindings in an instance declaration"
379 meth_names = collectLocatedMonoBinders mbinds
380 (inst_tyvars, _, cls,_) = splitHsInstDeclTy inst_ty
381 -- (Slightly strangely) the forall-d tyvars scope over
382 -- the method bindings too
385 -- Rename the bindings
386 -- NB meth_names can be qualified!
387 checkDupNames meth_doc meth_names `thenM_`
388 extendTyVarEnvForMethodBinds inst_tyvars (
389 rnMethodBinds cls [] mbinds
390 ) `thenM` \ (mbinds', meth_fvs) ->
392 binders = collectMonoBinders mbinds'
394 -- Rename the prags and signatures.
395 -- Note that the type variables are not in scope here,
396 -- so that instance Eq a => Eq (T a) where
397 -- {-# SPECIALISE instance Eq a => Eq (T [a]) #-}
400 -- But the (unqualified) method names are in scope
401 bindLocalNames binders (renameSigs uprags) `thenM` \ uprags' ->
402 checkSigs (okInstDclSig (mkNameSet binders)) uprags' `thenM_`
404 returnM (InstDecl inst_ty mbinds' uprags' maybe_dfun_name src_loc,
405 meth_fvs `plusFV` hsSigsFVs uprags')
408 %*********************************************************
412 %*********************************************************
415 rnIfaceRuleDecl (IfaceRule rule_name act vars fn args rhs src_loc)
416 = addSrcLoc src_loc $
417 lookupOccRn fn `thenM` \ fn' ->
418 rnCoreBndrs vars $ \ vars' ->
419 mappM rnCoreExpr args `thenM` \ args' ->
420 rnCoreExpr rhs `thenM` \ rhs' ->
421 returnM (IfaceRule rule_name act vars' fn' args' rhs' src_loc)
423 rnIfaceRuleDecl (IfaceRuleOut fn rule) -- Builtin rules come this way
424 = lookupOccRn fn `thenM` \ fn' ->
425 returnM (IfaceRuleOut fn' rule)
427 rnHsRuleDecl (HsRule rule_name act vars lhs rhs src_loc)
428 = addSrcLoc src_loc $
429 bindPatSigTyVarsFV (collectRuleBndrSigTys vars) $
431 bindLocalsFV doc (map get_var vars) $ \ ids ->
432 mapFvRn rn_var (vars `zip` ids) `thenM` \ (vars', fv_vars) ->
434 rnExpr lhs `thenM` \ (lhs', fv_lhs) ->
435 rnExpr rhs `thenM` \ (rhs', fv_rhs) ->
437 mb_bad = validRuleLhs ids lhs'
439 checkErr (isNothing mb_bad)
440 (badRuleLhsErr rule_name lhs' mb_bad) `thenM_`
442 bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)]
444 mappM (addErr . badRuleVar rule_name) bad_vars `thenM_`
445 returnM (HsRule rule_name act vars' lhs' rhs' src_loc,
446 fv_vars `plusFV` fv_lhs `plusFV` fv_rhs)
448 doc = text "In the transformation rule" <+> ftext rule_name
450 get_var (RuleBndr v) = v
451 get_var (RuleBndrSig v _) = v
453 rn_var (RuleBndr v, id) = returnM (RuleBndr id, emptyFVs)
454 rn_var (RuleBndrSig v t, id) = rnHsTypeFVs doc t `thenM` \ (t', fvs) ->
455 returnM (RuleBndrSig id t', fvs)
458 Check the shape of a transformation rule LHS. Currently
459 we only allow LHSs of the form @(f e1 .. en)@, where @f@ is
460 not one of the @forall@'d variables. We also restrict the form of the LHS so
461 that it may be plausibly matched. Basically you only get to write ordinary
462 applications. (E.g. a case expression is not allowed: too elaborate.)
464 NB: if you add new cases here, make sure you add new ones to TcRule.ruleLhsTvs
467 validRuleLhs :: [Name] -> RenamedHsExpr -> Maybe RenamedHsExpr
469 -- Just e => Not ok, and e is the offending expression
470 validRuleLhs foralls lhs
473 check (OpApp e1 op _ e2) = check op `seqMaybe` check_e e1 `seqMaybe` check_e e2
474 check (HsApp e1 e2) = check e1 `seqMaybe` check_e e2
475 check (HsVar v) | v `notElem` foralls = Nothing
476 check other = Just other -- Failure
478 check_e (HsVar v) = Nothing
479 check_e (HsPar e) = check_e e
480 check_e (HsLit e) = Nothing
481 check_e (HsOverLit e) = Nothing
483 check_e (OpApp e1 op _ e2) = check_e e1 `seqMaybe` check_e op `seqMaybe` check_e e2
484 check_e (HsApp e1 e2) = check_e e1 `seqMaybe` check_e e2
485 check_e (NegApp e _) = check_e e
486 check_e (ExplicitList _ es) = check_es es
487 check_e (ExplicitTuple es _) = check_es es
488 check_e other = Just other -- Fails
490 check_es es = foldr (seqMaybe . check_e) Nothing es
494 %*********************************************************
496 \subsection{Type, class and iface sig declarations}
498 %*********************************************************
500 @rnTyDecl@ uses the `global name function' to create a new type
501 declaration in which local names have been replaced by their original
502 names, reporting any unknown names.
504 Renaming type variables is a pain. Because they now contain uniques,
505 it is necessary to pass in an association list which maps a parsed
506 tyvar to its @Name@ representation.
507 In some cases (type signatures of values),
508 it is even necessary to go over the type first
509 in order to get the set of tyvars used by it, make an assoc list,
510 and then go over it again to rename the tyvars!
511 However, we can also do some scoping checks at the same time.
514 rnTyClDecl (IfaceSig {tcdName = name, tcdType = ty, tcdIdInfo = id_infos, tcdLoc = loc})
516 lookupTopBndrRn name `thenM` \ name' ->
517 rnHsType doc_str ty `thenM` \ ty' ->
518 mappM rnIdInfo id_infos `thenM` \ id_infos' ->
519 returnM (IfaceSig {tcdName = name', tcdType = ty', tcdIdInfo = id_infos', tcdLoc = loc})
521 doc_str = text "In the interface signature for" <+> quotes (ppr name)
523 rnTyClDecl (ForeignType {tcdName = name, tcdFoType = fo_type, tcdExtName = ext_name, tcdLoc = loc})
525 lookupTopBndrRn name `thenM` \ name' ->
526 returnM (ForeignType {tcdName = name', tcdFoType = fo_type, tcdExtName = ext_name, tcdLoc = loc})
528 rnTyClDecl (TyData {tcdND = new_or_data, tcdCtxt = context, tcdName = tycon,
529 tcdTyVars = tyvars, tcdCons = condecls, tcdGeneric = want_generic,
530 tcdDerivs = derivs, tcdLoc = src_loc})
531 = addSrcLoc src_loc $
532 lookupTopBndrRn tycon `thenM` \ tycon' ->
533 bindTyVarsRn data_doc tyvars $ \ tyvars' ->
534 rnContext data_doc context `thenM` \ context' ->
535 rn_derivs derivs `thenM` \ derivs' ->
536 checkDupOrQualNames data_doc con_names `thenM_`
538 rnConDecls tycon' condecls `thenM` \ condecls' ->
539 returnM (TyData {tcdND = new_or_data, tcdCtxt = context', tcdName = tycon',
540 tcdTyVars = tyvars', tcdCons = condecls', tcdGeneric = want_generic,
541 tcdDerivs = derivs', tcdLoc = src_loc})
543 data_doc = text "In the data type declaration for" <+> quotes (ppr tycon)
544 con_names = map conDeclName (visibleDataCons condecls)
546 rn_derivs Nothing = returnM Nothing
547 rn_derivs (Just ds) = rnContext data_doc ds `thenM` \ ds' -> returnM (Just ds')
549 rnTyClDecl (TySynonym {tcdName = name, tcdTyVars = tyvars, tcdSynRhs = ty, tcdLoc = src_loc})
550 = addSrcLoc src_loc $
551 lookupTopBndrRn name `thenM` \ name' ->
552 bindTyVarsRn syn_doc tyvars $ \ tyvars' ->
553 rnHsType syn_doc ty `thenM` \ ty' ->
554 returnM (TySynonym {tcdName = name', tcdTyVars = tyvars', tcdSynRhs = ty', tcdLoc = src_loc})
556 syn_doc = text "In the declaration for type synonym" <+> quotes (ppr name)
558 rnTyClDecl (ClassDecl {tcdCtxt = context, tcdName = cname,
559 tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs,
561 -- Used for both source and interface file decls
562 = addSrcLoc src_loc $
564 lookupTopBndrRn cname `thenM` \ cname' ->
566 -- Tyvars scope over superclass context and method signatures
567 bindTyVarsRn cls_doc tyvars $ \ tyvars' ->
569 -- Check the superclasses
570 rnContext cls_doc context `thenM` \ context' ->
572 -- Check the functional dependencies
573 rnFds cls_doc fds `thenM` \ fds' ->
575 -- Check the signatures
576 -- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs).
578 (op_sigs, non_op_sigs) = partition isClassOpSig sigs
579 sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs]
581 checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenM_`
582 mappM (rnClassOp cname' fds') op_sigs `thenM` \ sigs' ->
583 renameSigs non_op_sigs `thenM` \ non_ops' ->
584 checkSigs okClsDclSig non_ops' `thenM_`
585 -- Typechecker is responsible for checking that we only
586 -- give default-method bindings for things in this class.
587 -- The renamer *could* check this for class decls, but can't
588 -- for instance decls.
590 returnM (ClassDecl { tcdCtxt = context', tcdName = cname', tcdTyVars = tyvars',
591 tcdFDs = fds', tcdSigs = non_ops' ++ sigs', tcdMeths = Nothing,
594 cls_doc = text "In the declaration for class" <+> ppr cname
595 sig_doc = text "In the signatures for class" <+> ppr cname
597 rnClassOp clas clas_fds sig@(ClassOpSig op dm_stuff ty locn)
599 lookupTopBndrRn op `thenM` \ op_name ->
601 -- Check the signature
602 rnHsSigType (quotes (ppr op)) ty `thenM` \ new_ty ->
604 -- Make the default-method name
607 -> -- Imported class that has a default method decl
608 lookupSysBndr dm_rdr_name `thenM` \ dm_name ->
609 returnM (DefMeth dm_name)
610 -- An imported class decl for a class decl that had an explicit default
611 -- method, mentions, rather than defines,
612 -- the default method, so we must arrange to pull it in
614 GenDefMeth -> returnM GenDefMeth
615 NoDefMeth -> returnM NoDefMeth
616 ) `thenM` \ dm_stuff' ->
618 returnM (ClassOpSig op_name dm_stuff' new_ty locn)
620 finishSourceTyClDecl :: RdrNameTyClDecl -> RenamedTyClDecl -> RnM (RenamedTyClDecl, FreeVars)
621 -- Used for source file decls only
622 -- Renames the default-bindings of a class decl
623 finishSourceTyClDecl (ClassDecl {tcdMeths = Just mbinds, tcdLoc = src_loc}) -- Get mbinds from here
624 rn_cls_decl@(ClassDecl {tcdName = cls, tcdTyVars = tyvars}) -- Everything else is here
625 -- There are some default-method bindings (abeit possibly empty) so
626 -- this is a source-code class declaration
627 = -- The newLocals call is tiresome: given a generic class decl
630 -- op {| x+y |} (Inl a) = ...
631 -- op {| x+y |} (Inr b) = ...
632 -- op {| a*b |} (a*b) = ...
633 -- we want to name both "x" tyvars with the same unique, so that they are
634 -- easy to group together in the typechecker.
637 extendTyVarEnvForMethodBinds tyvars $
638 getLocalRdrEnv `thenM` \ name_env ->
640 meth_rdr_names_w_locs = collectLocatedMonoBinders mbinds
641 gen_rdr_tyvars_w_locs = [(tv,src_loc) | tv <- extractGenericPatTyVars mbinds,
642 not (tv `elemRdrEnv` name_env)]
644 checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenM_`
645 newLocalsRn gen_rdr_tyvars_w_locs `thenM` \ gen_tyvars ->
646 rnMethodBinds cls gen_tyvars mbinds `thenM` \ (mbinds', meth_fvs) ->
647 returnM (rn_cls_decl {tcdMeths = Just mbinds'}, meth_fvs)
649 meth_doc = text "In the default-methods for class" <+> ppr (tcdName rn_cls_decl)
651 finishSourceTyClDecl _ tycl_decl@(TyData {tcdDerivs = derivings})
652 -- Derivings are returned here so that they don't form part of the tyClDeclFVs.
653 -- This is important, because tyClDeclFVs should contain only the
654 -- FVs that are `needed' by the interface file declaration, and
655 -- derivings do not appear in this. It also means that the tcGroups
656 -- are smaller, which turned out to be important for the usage inference. KSW 2002-02.
657 = returnM (tycl_decl,
658 maybe emptyFVs extractHsCtxtTyNames derivings)
660 finishSourceTyClDecl _ tycl_decl = returnM (tycl_decl, emptyFVs)
661 -- Not a class declaration
664 For the method bindings in class and instance decls, we extend the
665 type variable environment iff -fglasgow-exts
668 extendTyVarEnvForMethodBinds tyvars thing_inside
669 = doptM Opt_GlasgowExts `thenM` \ opt_GlasgowExts ->
670 if opt_GlasgowExts then
671 extendTyVarEnvFVRn (map hsTyVarName tyvars) thing_inside
677 %*********************************************************
679 \subsection{Support code for type/data declarations}
681 %*********************************************************
684 conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc)
685 conDeclName (ConDecl n _ _ _ l) = (n,l)
687 rnConDecls :: Name -> DataConDetails RdrNameConDecl -> RnM (DataConDetails RenamedConDecl)
688 rnConDecls tycon Unknown = returnM Unknown
689 rnConDecls tycon (HasCons n) = returnM (HasCons n)
690 rnConDecls tycon (DataCons condecls)
691 = -- Check that there's at least one condecl,
692 -- or else we're reading an interface file, or -fglasgow-exts
693 (if null condecls then
694 doptM Opt_GlasgowExts `thenM` \ glaExts ->
695 getModeRn `thenM` \ mode ->
696 checkErr (glaExts || isInterfaceMode mode)
697 (emptyConDeclsErr tycon)
701 mappM rnConDecl condecls `thenM` \ condecls' ->
702 returnM (DataCons condecls')
704 rnConDecl :: RdrNameConDecl -> RnM RenamedConDecl
705 rnConDecl (ConDecl name tvs cxt details locn)
707 checkConName name `thenM_`
708 lookupTopBndrRn name `thenM` \ new_name ->
710 bindTyVarsRn doc tvs $ \ new_tyvars ->
711 rnContext doc cxt `thenM` \ new_context ->
712 rnConDetails doc locn details `thenM` \ new_details ->
713 returnM (ConDecl new_name new_tyvars new_context new_details locn)
715 doc = text "In the definition of data constructor" <+> quotes (ppr name)
717 rnConDetails doc locn (PrefixCon tys)
718 = mappM (rnBangTy doc) tys `thenM` \ new_tys ->
719 returnM (PrefixCon new_tys)
721 rnConDetails doc locn (InfixCon ty1 ty2)
722 = rnBangTy doc ty1 `thenM` \ new_ty1 ->
723 rnBangTy doc ty2 `thenM` \ new_ty2 ->
724 returnM (InfixCon new_ty1 new_ty2)
726 rnConDetails doc locn (RecCon fields)
727 = checkDupOrQualNames doc field_names `thenM_`
728 mappM (rnField doc) fields `thenM` \ new_fields ->
729 returnM (RecCon new_fields)
731 field_names = [(fld, locn) | (fld, _) <- fields]
733 rnField doc (name, ty)
734 = lookupTopBndrRn name `thenM` \ new_name ->
735 rnBangTy doc ty `thenM` \ new_ty ->
736 returnM (new_name, new_ty)
738 rnBangTy doc (BangType s ty)
739 = rnHsType doc ty `thenM` \ new_ty ->
740 returnM (BangType s new_ty)
742 -- This data decl will parse OK
744 -- treating "a" as the constructor.
745 -- It is really hard to make the parser spot this malformation.
746 -- So the renamer has to check that the constructor is legal
748 -- We can get an operator as the constructor, even in the prefix form:
749 -- data T = :% Int Int
750 -- from interface files, which always print in prefix form
753 = checkErr (isRdrDataCon name) (badDataCon name)
757 %*********************************************************
759 \subsection{Support code to rename types}
761 %*********************************************************
764 rnFds :: SDoc -> [FunDep RdrName] -> RnM [FunDep Name]
770 = rnHsTyVars doc tys1 `thenM` \ tys1' ->
771 rnHsTyVars doc tys2 `thenM` \ tys2' ->
772 returnM (tys1', tys2')
774 rnHsTyVars doc tvs = mappM (rnHsTyvar doc) tvs
775 rnHsTyvar doc tyvar = lookupOccRn tyvar
778 %*********************************************************
782 %*********************************************************
785 rnIdInfo (HsWorker worker arity)
786 = lookupOccRn worker `thenM` \ worker' ->
787 returnM (HsWorker worker' arity)
789 rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenM` \ expr' ->
790 returnM (HsUnfold inline expr')
791 rnIdInfo (HsStrictness str) = returnM (HsStrictness str)
792 rnIdInfo (HsArity arity) = returnM (HsArity arity)
793 rnIdInfo HsNoCafRefs = returnM HsNoCafRefs
796 @UfCore@ expressions.
799 rnCoreExpr (UfType ty)
800 = rnHsType (text "unfolding type") ty `thenM` \ ty' ->
804 = lookupOccRn v `thenM` \ v' ->
810 rnCoreExpr (UfFCall cc ty)
811 = rnHsType (text "ccall") ty `thenM` \ ty' ->
812 returnM (UfFCall cc ty')
814 rnCoreExpr (UfTuple (HsTupCon boxity arity) args)
815 = mappM rnCoreExpr args `thenM` \ args' ->
816 returnM (UfTuple (HsTupCon boxity arity) args')
818 rnCoreExpr (UfApp fun arg)
819 = rnCoreExpr fun `thenM` \ fun' ->
820 rnCoreExpr arg `thenM` \ arg' ->
821 returnM (UfApp fun' arg')
823 rnCoreExpr (UfCase scrut bndr alts)
824 = rnCoreExpr scrut `thenM` \ scrut' ->
825 bindCoreLocalRn bndr $ \ bndr' ->
826 mappM rnCoreAlt alts `thenM` \ alts' ->
827 returnM (UfCase scrut' bndr' alts')
829 rnCoreExpr (UfNote note expr)
830 = rnNote note `thenM` \ note' ->
831 rnCoreExpr expr `thenM` \ expr' ->
832 returnM (UfNote note' expr')
834 rnCoreExpr (UfLam bndr body)
835 = rnCoreBndr bndr $ \ bndr' ->
836 rnCoreExpr body `thenM` \ body' ->
837 returnM (UfLam bndr' body')
839 rnCoreExpr (UfLet (UfNonRec bndr rhs) body)
840 = rnCoreExpr rhs `thenM` \ rhs' ->
841 rnCoreBndr bndr $ \ bndr' ->
842 rnCoreExpr body `thenM` \ body' ->
843 returnM (UfLet (UfNonRec bndr' rhs') body')
845 rnCoreExpr (UfLet (UfRec pairs) body)
846 = rnCoreBndrs bndrs $ \ bndrs' ->
847 mappM rnCoreExpr rhss `thenM` \ rhss' ->
848 rnCoreExpr body `thenM` \ body' ->
849 returnM (UfLet (UfRec (bndrs' `zip` rhss')) body')
851 (bndrs, rhss) = unzip pairs
855 rnCoreBndr (UfValBinder name ty) thing_inside
856 = rnHsType doc ty `thenM` \ ty' ->
857 bindCoreLocalRn name $ \ name' ->
858 thing_inside (UfValBinder name' ty')
860 doc = text "unfolding id"
862 rnCoreBndr (UfTyBinder name kind) thing_inside
863 = bindCoreLocalRn name $ \ name' ->
864 thing_inside (UfTyBinder name' kind)
866 rnCoreBndrs [] thing_inside = thing_inside []
867 rnCoreBndrs (b:bs) thing_inside = rnCoreBndr b $ \ name' ->
868 rnCoreBndrs bs $ \ names' ->
869 thing_inside (name':names')
873 rnCoreAlt (con, bndrs, rhs)
874 = rnUfCon con `thenM` \ con' ->
875 bindCoreLocalsRn bndrs $ \ bndrs' ->
876 rnCoreExpr rhs `thenM` \ rhs' ->
877 returnM (con', bndrs', rhs')
880 = rnHsType (text "unfolding coerce") ty `thenM` \ ty' ->
881 returnM (UfCoerce ty')
883 rnNote (UfSCC cc) = returnM (UfSCC cc)
884 rnNote UfInlineCall = returnM UfInlineCall
885 rnNote UfInlineMe = returnM UfInlineMe
886 rnNote (UfCoreNote s) = returnM (UfCoreNote s)
891 rnUfCon (UfTupleAlt tup_con)
892 = returnM (UfTupleAlt tup_con)
894 rnUfCon (UfDataAlt con)
895 = lookupOccRn con `thenM` \ con' ->
896 returnM (UfDataAlt con')
898 rnUfCon (UfLitAlt lit)
899 = returnM (UfLitAlt lit)
902 %*********************************************************
904 \subsection{Statistics}
906 %*********************************************************
909 rnStats :: [RenamedHsDecl] -- Imported decls
912 = doptM Opt_D_dump_rn_trace `thenM` \ dump_rn_trace ->
913 doptM Opt_D_dump_rn_stats `thenM` \ dump_rn_stats ->
914 doptM Opt_D_dump_rn `thenM` \ dump_rn ->
915 getEps `thenM` \ eps ->
917 ioToTcRn (dumpIfSet (dump_rn_trace || dump_rn_stats || dump_rn)
919 (getRnStats eps imp_decls)) `thenM_`
922 getRnStats :: ExternalPackageState -> [RenamedHsDecl] -> SDoc
923 getRnStats eps imported_decls
924 = hcat [text "Renamer stats: ", stats]
926 n_mods = length [() | _ <- moduleEnvElts (eps_PIT eps)]
927 -- This is really only right for a one-shot compile
929 (decls_map, n_decls_slurped) = eps_decls eps
931 n_decls_left = length [decl | (avail, True, (_,decl)) <- nameEnvElts decls_map
932 -- Data, newtype, and class decls are in the decls_fm
933 -- under multiple names; the tycon/class, and each
934 -- constructor/class op too.
935 -- The 'True' selects just the 'main' decl
938 (insts_left, n_insts_slurped) = eps_insts eps
939 n_insts_left = length (bagToList insts_left)
941 (rules_left, n_rules_slurped) = eps_rules eps
942 n_rules_left = length (bagToList rules_left)
945 [int n_mods <+> text "interfaces read",
946 hsep [ int n_decls_slurped, text "type/class/variable imported, out of",
947 int (n_decls_slurped + n_decls_left), text "read"],
948 hsep [ int n_insts_slurped, text "instance decls imported, out of",
949 int (n_insts_slurped + n_insts_left), text "read"],
950 hsep [ int n_rules_slurped, text "rule decls imported, out of",
951 int (n_rules_slurped + n_rules_left), text "read"]
955 %*********************************************************
959 %*********************************************************
963 = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)]
965 badRuleLhsErr name lhs (Just bad_e)
966 = sep [ptext SLIT("Rule") <+> ftext name <> colon,
967 nest 4 (vcat [ptext SLIT("Illegal expression:") <+> ppr bad_e,
968 ptext SLIT("in left-hand side:") <+> ppr lhs])]
970 ptext SLIT("LHS must be of form (f e1 .. en) where f is not forall'd")
973 = sep [ptext SLIT("Rule") <+> doubleQuotes (ftext name) <> colon,
974 ptext SLIT("Forall'd variable") <+> quotes (ppr var) <+>
975 ptext SLIT("does not appear on left hand side")]
977 emptyConDeclsErr tycon
978 = sep [quotes (ppr tycon) <+> ptext SLIT("has no constructors"),
979 nest 4 (ptext SLIT("(-fglasgow-exts permits this)"))]
982 = sep [quotes (ptext SLIT("with")),
983 ptext SLIT("is deprecated, use"),
984 quotes (ptext SLIT("let")),
985 ptext SLIT("instead")]
988 = hang (ptext SLIT("Implicit-parameter bindings illegal in 'mdo':")) 4