2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[RnSource]{Main pass of renamer}
7 module RnSource ( rnTyClDecl, rnIfaceRuleDecl, rnInstDecl, rnSourceDecls,
10 #include "HsVersions.h"
14 import HscTypes ( GlobalRdrEnv, AvailEnv )
15 import RdrName ( RdrName, isRdrDataCon, elemRdrEnv )
16 import RdrHsSyn ( RdrNameConDecl, RdrNameTyClDecl,
17 extractGenericPatTyVars
22 import RnTypes ( rnHsType, rnHsSigType, rnHsTypeFVs, rnContext )
24 import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, renameSigsFVs )
25 import RnEnv ( lookupTopBndrRn, lookupOccRn, lookupIfaceName,
26 lookupSysBinder, newLocalsRn,
27 bindLocalsFVRn, bindPatSigTyVars,
28 bindTyVarsRn, extendTyVarEnvFVRn,
29 bindCoreLocalRn, bindCoreLocalsRn, bindLocalNames,
30 checkDupOrQualNames, checkDupNames, mapFvRn
34 import Class ( FunDep, DefMeth (..) )
35 import TyCon ( DataConDetails(..), visibleDataCons )
36 import DataCon ( dataConId )
37 import Name ( Name, NamedThing(..) )
39 import PrelNames ( deRefStablePtrName, newStablePtrName,
40 bindIOName, returnIOName
42 import TysWiredIn ( tupleCon )
43 import List ( partition )
45 import SrcLoc ( SrcLoc )
46 import CmdLineOpts ( DynFlag(..) )
47 -- Warn of unused for-all'd tyvars
48 import Maybes ( maybeToBool )
49 import Maybe ( maybe )
52 @rnSourceDecl@ `renames' declarations.
53 It simultaneously performs dependency analysis and precedence parsing.
54 It also does the following error checks:
57 Checks that tyvars are used properly. This includes checking
58 for undefined tyvars, and tyvars in contexts that are ambiguous.
59 (Some of this checking has now been moved to module @TcMonoType@,
60 since we don't have functional dependency information at this point.)
62 Checks that all variable occurences are defined.
64 Checks the @(..)@ etc constraints in the export list.
68 %*********************************************************
70 \subsection{Source code declarations}
72 %*********************************************************
75 rnSourceDecls :: GlobalRdrEnv -> AvailEnv -> LocalFixityEnv
77 -> RnMG ([RenamedHsDecl], FreeVars)
78 -- The decls get reversed, but that's ok
80 rnSourceDecls gbl_env avails local_fixity_env decls
81 = initRnMS gbl_env avails emptyRdrEnv local_fixity_env SourceMode (go emptyFVs [] decls)
83 -- Fixity and deprecations have been dealt with already; ignore them
84 go fvs ds' [] = returnRn (ds', fvs)
85 go fvs ds' (FixD _:ds) = go fvs ds' ds
86 go fvs ds' (DeprecD _:ds) = go fvs ds' ds
87 go fvs ds' (d:ds) = rnSourceDecl d `thenRn` \(d', fvs') ->
88 go (fvs `plusFV` fvs') (d':ds') ds
91 rnSourceDecl :: RdrNameHsDecl -> RnMS (RenamedHsDecl, FreeVars)
93 rnSourceDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) ->
94 returnRn (ValD new_binds, fvs)
96 rnSourceDecl (TyClD tycl_decl)
97 = rnTyClDecl tycl_decl `thenRn` \ new_decl ->
98 finishSourceTyClDecl tycl_decl new_decl `thenRn` \ (new_decl', fvs) ->
99 returnRn (TyClD new_decl', fvs `plusFV` tyClDeclFVs new_decl')
101 rnSourceDecl (InstD inst)
102 = rnInstDecl inst `thenRn` \ new_inst ->
103 finishSourceInstDecl inst new_inst `thenRn` \ (new_inst', fvs) ->
104 returnRn (InstD new_inst', fvs `plusFV` instDeclFVs new_inst')
106 rnSourceDecl (RuleD rule)
107 = rnHsRuleDecl rule `thenRn` \ (new_rule, fvs) ->
108 returnRn (RuleD new_rule, fvs)
110 rnSourceDecl (ForD ford)
111 = rnHsForeignDecl ford `thenRn` \ (new_ford, fvs) ->
112 returnRn (ForD new_ford, fvs)
114 rnSourceDecl (DefD (DefaultDecl tys src_loc))
115 = pushSrcLocRn src_loc $
116 mapFvRn (rnHsTypeFVs doc_str) tys `thenRn` \ (tys', fvs) ->
117 returnRn (DefD (DefaultDecl tys' src_loc), fvs)
119 doc_str = text "In a `default' declaration"
123 %*********************************************************
125 \subsection{Foreign declarations}
127 %*********************************************************
130 rnHsForeignDecl (ForeignImport name ty spec isDeprec src_loc)
131 = pushSrcLocRn src_loc $
132 lookupTopBndrRn name `thenRn` \ name' ->
133 rnHsTypeFVs (fo_decl_msg name) ty `thenRn` \ (ty', fvs) ->
134 returnRn (ForeignImport name' ty' spec isDeprec src_loc,
135 fvs `plusFV` extras spec)
137 extras (CImport _ _ _ _ CWrapper) = mkFVs [newStablePtrName,
139 bindIOName, returnIOName]
142 rnHsForeignDecl (ForeignExport name ty spec isDeprec src_loc)
143 = pushSrcLocRn src_loc $
144 lookupOccRn name `thenRn` \ name' ->
145 rnHsTypeFVs (fo_decl_msg name) ty `thenRn` \ (ty', fvs) ->
146 returnRn (ForeignExport name' ty' spec isDeprec src_loc,
147 mkFVs [bindIOName, returnIOName] `plusFV` fvs)
149 fo_decl_msg name = ptext SLIT("The foreign declaration for") <+> ppr name
153 %*********************************************************
155 \subsection{Instance declarations}
157 %*********************************************************
160 rnInstDecl (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc)
161 -- Used for both source and interface file decls
162 = pushSrcLocRn src_loc $
163 rnHsSigType (text "an instance decl") inst_ty `thenRn` \ inst_ty' ->
165 (case maybe_dfun_rdr_name of
166 Nothing -> returnRn Nothing
167 Just dfun_rdr_name -> lookupIfaceName dfun_rdr_name `thenRn` \ dfun_name ->
168 returnRn (Just dfun_name)
169 ) `thenRn` \ maybe_dfun_name ->
171 -- The typechecker checks that all the bindings are for the right class.
172 returnRn (InstDecl inst_ty' EmptyMonoBinds [] maybe_dfun_name src_loc)
174 -- Compare finishSourceTyClDecl
175 finishSourceInstDecl (InstDecl _ mbinds uprags _ _ )
176 (InstDecl inst_ty _ _ maybe_dfun_name src_loc)
177 -- Used for both source decls only
178 = ASSERT( not (maybeToBool maybe_dfun_name) ) -- Source decl!
180 meth_doc = text "In the bindings in an instance declaration"
181 meth_names = collectLocatedMonoBinders mbinds
182 (inst_tyvars, (cls,_)) = getHsInstHead inst_ty
183 -- (Slightly strangely) the forall-d tyvars scope over
184 -- the method bindings too
187 -- Rename the bindings
188 -- NB meth_names can be qualified!
189 checkDupNames meth_doc meth_names `thenRn_`
190 extendTyVarEnvFVRn (map hsTyVarName inst_tyvars) (
191 rnMethodBinds cls [] mbinds
192 ) `thenRn` \ (mbinds', meth_fvs) ->
194 binders = collectMonoBinders mbinds'
195 binder_set = mkNameSet binders
197 -- Rename the prags and signatures.
198 -- Note that the type variables are not in scope here,
199 -- so that instance Eq a => Eq (T a) where
200 -- {-# SPECIALISE instance Eq a => Eq (T [a]) #-}
203 -- But the (unqualified) method names are in scope
204 bindLocalNames binders (
205 renameSigsFVs (okInstDclSig binder_set) uprags
206 ) `thenRn` \ (uprags', prag_fvs) ->
208 returnRn (InstDecl inst_ty mbinds' uprags' maybe_dfun_name src_loc,
209 meth_fvs `plusFV` prag_fvs)
212 %*********************************************************
216 %*********************************************************
219 rnIfaceRuleDecl (IfaceRule rule_name act vars fn args rhs src_loc)
220 = pushSrcLocRn src_loc $
221 lookupOccRn fn `thenRn` \ fn' ->
222 rnCoreBndrs vars $ \ vars' ->
223 mapRn rnCoreExpr args `thenRn` \ args' ->
224 rnCoreExpr rhs `thenRn` \ rhs' ->
225 returnRn (IfaceRule rule_name act vars' fn' args' rhs' src_loc)
227 rnIfaceRuleDecl (IfaceRuleOut fn rule) -- Builtin rules come this way
228 = lookupOccRn fn `thenRn` \ fn' ->
229 returnRn (IfaceRuleOut fn' rule)
231 rnHsRuleDecl (HsRule rule_name act vars lhs rhs src_loc)
232 = pushSrcLocRn src_loc $
233 bindPatSigTyVars (collectRuleBndrSigTys vars) $
235 bindLocalsFVRn doc (map get_var vars) $ \ ids ->
236 mapFvRn rn_var (vars `zip` ids) `thenRn` \ (vars', fv_vars) ->
238 rnExpr lhs `thenRn` \ (lhs', fv_lhs) ->
239 rnExpr rhs `thenRn` \ (rhs', fv_rhs) ->
240 checkRn (validRuleLhs ids lhs')
241 (badRuleLhsErr rule_name lhs') `thenRn_`
243 bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)]
245 mapRn (addErrRn . badRuleVar rule_name) bad_vars `thenRn_`
246 returnRn (HsRule rule_name act vars' lhs' rhs' src_loc,
247 fv_vars `plusFV` fv_lhs `plusFV` fv_rhs)
249 doc = text "In the transformation rule" <+> ptext rule_name
251 get_var (RuleBndr v) = v
252 get_var (RuleBndrSig v _) = v
254 rn_var (RuleBndr v, id) = returnRn (RuleBndr id, emptyFVs)
255 rn_var (RuleBndrSig v t, id) = rnHsTypeFVs doc t `thenRn` \ (t', fvs) ->
256 returnRn (RuleBndrSig id t', fvs)
260 %*********************************************************
262 \subsection{Type, class and iface sig declarations}
264 %*********************************************************
266 @rnTyDecl@ uses the `global name function' to create a new type
267 declaration in which local names have been replaced by their original
268 names, reporting any unknown names.
270 Renaming type variables is a pain. Because they now contain uniques,
271 it is necessary to pass in an association list which maps a parsed
272 tyvar to its @Name@ representation.
273 In some cases (type signatures of values),
274 it is even necessary to go over the type first
275 in order to get the set of tyvars used by it, make an assoc list,
276 and then go over it again to rename the tyvars!
277 However, we can also do some scoping checks at the same time.
280 rnTyClDecl (IfaceSig {tcdName = name, tcdType = ty, tcdIdInfo = id_infos, tcdLoc = loc})
282 lookupTopBndrRn name `thenRn` \ name' ->
283 rnHsType doc_str ty `thenRn` \ ty' ->
284 mapRn rnIdInfo id_infos `thenRn` \ id_infos' ->
285 returnRn (IfaceSig {tcdName = name', tcdType = ty', tcdIdInfo = id_infos', tcdLoc = loc})
287 doc_str = text "In the interface signature for" <+> quotes (ppr name)
289 rnTyClDecl (ForeignType {tcdName = name, tcdFoType = fo_type, tcdExtName = ext_name, tcdLoc = loc})
291 lookupTopBndrRn name `thenRn` \ name' ->
292 returnRn (ForeignType {tcdName = name', tcdFoType = fo_type, tcdExtName = ext_name, tcdLoc = loc})
294 rnTyClDecl (TyData {tcdND = new_or_data, tcdCtxt = context, tcdName = tycon,
295 tcdTyVars = tyvars, tcdCons = condecls,
296 tcdDerivs = derivs, 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 rn_derivs derivs `thenRn` \ derivs' ->
302 checkDupOrQualNames data_doc con_names `thenRn_`
304 rnConDecls tycon' condecls `thenRn` \ condecls' ->
305 mapRn lookupSysBinder sys_names `thenRn` \ sys_names' ->
306 returnRn (TyData {tcdND = new_or_data, tcdCtxt = context', tcdName = tycon',
307 tcdTyVars = tyvars', tcdCons = condecls',
308 tcdDerivs = derivs', tcdLoc = src_loc, tcdSysNames = sys_names'})
310 data_doc = text "In the data type declaration for" <+> quotes (ppr tycon)
311 con_names = map conDeclName (visibleDataCons condecls)
313 rn_derivs Nothing = returnRn Nothing
314 rn_derivs (Just ds) = rnContext data_doc ds `thenRn` \ ds' -> returnRn (Just ds')
316 rnTyClDecl (TySynonym {tcdName = name, tcdTyVars = tyvars, tcdSynRhs = ty, tcdLoc = src_loc})
317 = pushSrcLocRn src_loc $
318 lookupTopBndrRn name `thenRn` \ name' ->
319 bindTyVarsRn syn_doc tyvars $ \ tyvars' ->
320 rnHsType syn_doc ty `thenRn` \ ty' ->
321 returnRn (TySynonym {tcdName = name', tcdTyVars = tyvars', tcdSynRhs = ty', tcdLoc = src_loc})
323 syn_doc = text "In the declaration for type synonym" <+> quotes (ppr name)
325 rnTyClDecl (ClassDecl {tcdCtxt = context, tcdName = cname,
326 tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs,
327 tcdSysNames = names, tcdLoc = src_loc})
328 -- Used for both source and interface file decls
329 = pushSrcLocRn src_loc $
331 lookupTopBndrRn cname `thenRn` \ cname' ->
333 -- Deal with the implicit tycon and datacon name
334 -- They aren't in scope (because they aren't visible to the user)
335 -- and what we want to do is simply look them up in the cache;
336 -- we jolly well ought to get a 'hit' there!
337 mapRn lookupSysBinder names `thenRn` \ names' ->
339 -- Tyvars scope over bindings and context
340 bindTyVarsRn cls_doc tyvars $ \ tyvars' ->
342 -- Check the superclasses
343 rnContext cls_doc context `thenRn` \ context' ->
345 -- Check the functional dependencies
346 rnFds cls_doc fds `thenRn` \ fds' ->
348 -- Check the signatures
349 -- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs).
351 (op_sigs, non_op_sigs) = partition isClassOpSig sigs
352 sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs]
354 checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_`
355 mapRn (rnClassOp cname' fds') op_sigs `thenRn` \ sigs' ->
357 binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ]
359 renameSigs (okClsDclSig binders) non_op_sigs `thenRn` \ non_ops' ->
361 -- Typechecker is responsible for checking that we only
362 -- give default-method bindings for things in this class.
363 -- The renamer *could* check this for class decls, but can't
364 -- for instance decls.
366 returnRn (ClassDecl { tcdCtxt = context', tcdName = cname', tcdTyVars = tyvars',
367 tcdFDs = fds', tcdSigs = non_ops' ++ sigs', tcdMeths = Nothing,
368 tcdSysNames = names', tcdLoc = src_loc})
370 cls_doc = text "In the declaration for class" <+> ppr cname
371 sig_doc = text "In the signatures for class" <+> ppr cname
373 rnClassOp clas clas_fds sig@(ClassOpSig op dm_stuff ty locn)
374 = pushSrcLocRn locn $
375 lookupTopBndrRn op `thenRn` \ op_name ->
377 -- Check the signature
378 rnHsSigType (quotes (ppr op)) ty `thenRn` \ new_ty ->
380 -- Make the default-method name
383 -> -- Imported class that has a default method decl
384 -- See comments with tname, snames, above
385 lookupSysBinder dm_rdr_name `thenRn` \ dm_name ->
386 returnRn (DefMeth dm_name)
387 -- An imported class decl for a class decl that had an explicit default
388 -- method, mentions, rather than defines,
389 -- the default method, so we must arrange to pull it in
391 GenDefMeth -> returnRn GenDefMeth
392 NoDefMeth -> returnRn NoDefMeth
393 ) `thenRn` \ dm_stuff' ->
395 returnRn (ClassOpSig op_name dm_stuff' new_ty locn)
397 finishSourceTyClDecl :: RdrNameTyClDecl -> RenamedTyClDecl -> RnMS (RenamedTyClDecl, FreeVars)
398 -- Used for source file decls only
399 -- Renames the default-bindings of a class decl
400 finishSourceTyClDecl (ClassDecl {tcdMeths = Just mbinds, tcdLoc = src_loc}) -- Get mbinds from here
401 rn_cls_decl@(ClassDecl {tcdName = cls, tcdTyVars = tyvars}) -- Everything else is here
402 -- There are some default-method bindings (abeit possibly empty) so
403 -- this is a source-code class declaration
404 = -- The newLocals call is tiresome: given a generic class decl
407 -- op {| x+y |} (Inl a) = ...
408 -- op {| x+y |} (Inr b) = ...
409 -- op {| a*b |} (a*b) = ...
410 -- we want to name both "x" tyvars with the same unique, so that they are
411 -- easy to group together in the typechecker.
413 pushSrcLocRn src_loc $
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 cls gen_tyvars mbinds `thenRn` \ (mbinds', meth_fvs) ->
424 returnRn (rn_cls_decl {tcdMeths = Just mbinds'}, meth_fvs)
426 meth_doc = text "In the default-methods for class" <+> ppr (tcdName rn_cls_decl)
428 finishSourceTyClDecl _ tycl_decl@(TyData {tcdDerivs = derivings})
429 -- Derivings are returned here so that they don't form part of the tyClDeclFVs.
430 -- This is important, because tyClDeclFVs should contain only the
431 -- FVs that are `needed' by the interface file declaration, and
432 -- derivings do not appear in this. It also means that the tcGroups
433 -- are smaller, which turned out to be important for the usage inference. KSW 2002-02.
434 = returnRn (tycl_decl,
435 maybe emptyFVs extractHsCtxtTyNames derivings)
437 finishSourceTyClDecl _ tycl_decl = returnRn (tycl_decl, emptyFVs)
438 -- Not a class declaration
442 %*********************************************************
444 \subsection{Support code for type/data declarations}
446 %*********************************************************
449 conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc)
450 conDeclName (ConDecl n _ _ _ _ l) = (n,l)
452 rnConDecls :: Name -> DataConDetails RdrNameConDecl -> RnMS (DataConDetails RenamedConDecl)
453 rnConDecls tycon Unknown = returnRn Unknown
454 rnConDecls tycon (HasCons n) = returnRn (HasCons n)
455 rnConDecls tycon (DataCons condecls)
456 = -- Check that there's at least one condecl,
457 -- or else we're reading an interface file, or -fglasgow-exts
458 (if null condecls then
459 doptRn Opt_GlasgowExts `thenRn` \ glaExts ->
460 getModeRn `thenRn` \ mode ->
461 checkRn (glaExts || isInterfaceMode mode)
462 (emptyConDeclsErr tycon)
466 mapRn rnConDecl condecls `thenRn` \ condecls' ->
467 returnRn (DataCons condecls')
469 rnConDecl :: RdrNameConDecl -> RnMS RenamedConDecl
470 rnConDecl (ConDecl name wkr tvs cxt details locn)
471 = pushSrcLocRn locn $
472 checkConName name `thenRn_`
473 lookupTopBndrRn name `thenRn` \ new_name ->
475 lookupSysBinder wkr `thenRn` \ new_wkr ->
476 -- See comments with ClassDecl
478 bindTyVarsRn doc tvs $ \ new_tyvars ->
479 rnContext doc cxt `thenRn` \ new_context ->
480 rnConDetails doc locn details `thenRn` \ new_details ->
481 returnRn (ConDecl new_name new_wkr new_tyvars new_context new_details locn)
483 doc = text "In the definition of data constructor" <+> quotes (ppr name)
485 rnConDetails doc locn (VanillaCon tys)
486 = mapRn (rnBangTy doc) tys `thenRn` \ new_tys ->
487 returnRn (VanillaCon new_tys)
489 rnConDetails doc locn (InfixCon ty1 ty2)
490 = rnBangTy doc ty1 `thenRn` \ new_ty1 ->
491 rnBangTy doc ty2 `thenRn` \ new_ty2 ->
492 returnRn (InfixCon new_ty1 new_ty2)
494 rnConDetails doc locn (RecCon fields)
495 = checkDupOrQualNames doc field_names `thenRn_`
496 mapRn (rnField doc) fields `thenRn` \ new_fields ->
497 returnRn (RecCon new_fields)
499 field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds]
501 rnField doc (names, ty)
502 = mapRn lookupTopBndrRn names `thenRn` \ new_names ->
503 rnBangTy doc ty `thenRn` \ new_ty ->
504 returnRn (new_names, new_ty)
506 rnBangTy doc (BangType s ty)
507 = rnHsType doc ty `thenRn` \ new_ty ->
508 returnRn (BangType s new_ty)
510 -- This data decl will parse OK
512 -- treating "a" as the constructor.
513 -- It is really hard to make the parser spot this malformation.
514 -- So the renamer has to check that the constructor is legal
516 -- We can get an operator as the constructor, even in the prefix form:
517 -- data T = :% Int Int
518 -- from interface files, which always print in prefix form
521 = checkRn (isRdrDataCon name)
526 %*********************************************************
528 \subsection{Support code to rename types}
530 %*********************************************************
533 rnFds :: SDoc -> [FunDep RdrName] -> RnMS [FunDep Name]
539 = rnHsTyVars doc tys1 `thenRn` \ tys1' ->
540 rnHsTyVars doc tys2 `thenRn` \ tys2' ->
541 returnRn (tys1', tys2')
543 rnHsTyVars doc tvs = mapRn (rnHsTyvar doc) tvs
544 rnHsTyvar doc tyvar = lookupOccRn tyvar
547 %*********************************************************
551 %*********************************************************
554 rnIdInfo (HsWorker worker arity)
555 = lookupOccRn worker `thenRn` \ worker' ->
556 returnRn (HsWorker worker' arity)
558 rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ expr' ->
559 returnRn (HsUnfold inline expr')
560 rnIdInfo (HsStrictness str) = returnRn (HsStrictness str)
561 rnIdInfo (HsArity arity) = returnRn (HsArity arity)
562 rnIdInfo HsNoCafRefs = returnRn HsNoCafRefs
565 @UfCore@ expressions.
568 rnCoreExpr (UfType ty)
569 = rnHsType (text "unfolding type") ty `thenRn` \ ty' ->
570 returnRn (UfType ty')
573 = lookupOccRn v `thenRn` \ v' ->
579 rnCoreExpr (UfLitLit l ty)
580 = rnHsType (text "litlit") ty `thenRn` \ ty' ->
581 returnRn (UfLitLit l ty')
583 rnCoreExpr (UfFCall cc ty)
584 = rnHsType (text "ccall") ty `thenRn` \ ty' ->
585 returnRn (UfFCall cc ty')
587 rnCoreExpr (UfTuple (HsTupCon _ boxity arity) args)
588 = mapRn rnCoreExpr args `thenRn` \ args' ->
589 returnRn (UfTuple (HsTupCon tup_name boxity arity) args')
591 tup_name = getName (dataConId (tupleCon boxity arity))
592 -- Get the *worker* name and use that
594 rnCoreExpr (UfApp fun arg)
595 = rnCoreExpr fun `thenRn` \ fun' ->
596 rnCoreExpr arg `thenRn` \ arg' ->
597 returnRn (UfApp fun' arg')
599 rnCoreExpr (UfCase scrut bndr alts)
600 = rnCoreExpr scrut `thenRn` \ scrut' ->
601 bindCoreLocalRn bndr $ \ bndr' ->
602 mapRn rnCoreAlt alts `thenRn` \ alts' ->
603 returnRn (UfCase scrut' bndr' alts')
605 rnCoreExpr (UfNote note expr)
606 = rnNote note `thenRn` \ note' ->
607 rnCoreExpr expr `thenRn` \ expr' ->
608 returnRn (UfNote note' expr')
610 rnCoreExpr (UfLam bndr body)
611 = rnCoreBndr bndr $ \ bndr' ->
612 rnCoreExpr body `thenRn` \ body' ->
613 returnRn (UfLam bndr' body')
615 rnCoreExpr (UfLet (UfNonRec bndr rhs) body)
616 = rnCoreExpr rhs `thenRn` \ rhs' ->
617 rnCoreBndr bndr $ \ bndr' ->
618 rnCoreExpr body `thenRn` \ body' ->
619 returnRn (UfLet (UfNonRec bndr' rhs') body')
621 rnCoreExpr (UfLet (UfRec pairs) body)
622 = rnCoreBndrs bndrs $ \ bndrs' ->
623 mapRn rnCoreExpr rhss `thenRn` \ rhss' ->
624 rnCoreExpr body `thenRn` \ body' ->
625 returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body')
627 (bndrs, rhss) = unzip pairs
631 rnCoreBndr (UfValBinder name ty) thing_inside
632 = rnHsType doc ty `thenRn` \ ty' ->
633 bindCoreLocalRn name $ \ name' ->
634 thing_inside (UfValBinder name' ty')
636 doc = text "unfolding id"
638 rnCoreBndr (UfTyBinder name kind) thing_inside
639 = bindCoreLocalRn name $ \ name' ->
640 thing_inside (UfTyBinder name' kind)
642 rnCoreBndrs [] thing_inside = thing_inside []
643 rnCoreBndrs (b:bs) thing_inside = rnCoreBndr b $ \ name' ->
644 rnCoreBndrs bs $ \ names' ->
645 thing_inside (name':names')
649 rnCoreAlt (con, bndrs, rhs)
650 = rnUfCon con `thenRn` \ con' ->
651 bindCoreLocalsRn bndrs $ \ bndrs' ->
652 rnCoreExpr rhs `thenRn` \ rhs' ->
653 returnRn (con', bndrs', rhs')
656 = rnHsType (text "unfolding coerce") ty `thenRn` \ ty' ->
657 returnRn (UfCoerce ty')
659 rnNote (UfSCC cc) = returnRn (UfSCC cc)
660 rnNote UfInlineCall = returnRn UfInlineCall
661 rnNote UfInlineMe = returnRn UfInlineMe
667 rnUfCon (UfTupleAlt (HsTupCon _ boxity arity))
668 = returnRn (UfTupleAlt (HsTupCon tup_name boxity arity))
670 tup_name = getName (tupleCon boxity arity)
672 rnUfCon (UfDataAlt con)
673 = lookupOccRn con `thenRn` \ con' ->
674 returnRn (UfDataAlt con')
676 rnUfCon (UfLitAlt lit)
677 = returnRn (UfLitAlt lit)
679 rnUfCon (UfLitLitAlt lit ty)
680 = rnHsType (text "litlit") ty `thenRn` \ ty' ->
681 returnRn (UfLitLitAlt lit ty')
684 %*********************************************************
686 \subsection{Rule shapes}
688 %*********************************************************
690 Check the shape of a transformation rule LHS. Currently
691 we only allow LHSs of the form @(f e1 .. en)@, where @f@ is
692 not one of the @forall@'d variables.
695 validRuleLhs foralls lhs
698 check (OpApp _ op _ _) = check op
699 check (HsApp e1 e2) = check e1
700 check (HsVar v) | v `notElem` foralls = True
705 %*********************************************************
709 %*********************************************************
713 = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)]
715 badRuleLhsErr name lhs
716 = sep [ptext SLIT("Rule") <+> ptext name <> colon,
717 nest 4 (ptext SLIT("Illegal left-hand side:") <+> ppr lhs)]
719 ptext SLIT("LHS must be of form (f e1 .. en) where f is not forall'd")
722 = sep [ptext SLIT("Rule") <+> doubleQuotes (ptext name) <> colon,
723 ptext SLIT("Forall'd variable") <+> quotes (ppr var) <+>
724 ptext SLIT("does not appear on left hand side")]
726 emptyConDeclsErr tycon
727 = sep [quotes (ppr tycon) <+> ptext SLIT("has no constructors"),
728 nest 4 (ptext SLIT("(-fglasgow-exts permits this)"))]