2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[RnSource]{Main pass of renamer}
8 rnSrcDecls, addTcgDUs, rnTyClDecls, findSplice
11 #include "HsVersions.h"
13 import {-# SOURCE #-} RnExpr( rnLExpr )
15 import {-# SOURCE #-} TcSplice ( runQuasiQuoteDecl )
19 import RdrName ( RdrName, isRdrDataCon, elemLocalRdrEnv, rdrNameOcc )
20 import RdrHsSyn ( extractGenericPatTyVars, extractHsRhoRdrTyVars )
22 import RnTypes ( rnLHsType, rnLHsTypes, rnHsSigType, rnHsTypeFVs, rnContext, rnConDeclFields )
23 import RnBinds ( rnTopBindsLHS, rnTopBindsRHS, rnMethodBinds, renameSigs, mkSigTvFn,
25 import RnEnv ( lookupLocalDataTcNames, lookupLocatedOccRn,
26 lookupTopBndrRn, lookupLocatedTopBndrRn,
27 lookupOccRn, newLocalBndrsRn, bindLocalNamesFV,
28 bindLocatedLocalsFV, bindPatSigTyVarsFV,
29 bindTyVarsRn, bindTyVarsFV, extendTyVarEnvFVRn,
30 bindLocalNames, checkDupRdrNames, mapFvRn
32 import RnNames ( getLocalNonValBinders, extendGlobalRdrEnvRn )
33 import HscTypes ( GenAvailInfo(..), availsToNameSet )
34 import RnHsDoc ( rnHsDoc, rnMbLHsDoc )
37 import ForeignCall ( CCallTarget(..) )
39 import HscTypes ( Warnings(..), plusWarns )
40 import Class ( FunDep )
41 import Name ( Name, nameOccName )
47 import Util ( filterOut )
50 import HscTypes ( HscEnv, hsc_dflags )
51 import BasicTypes ( Boxity(..) )
52 import ListSetOps ( findDupsEq )
53 import Digraph ( SCC, flattenSCC, stronglyConnCompFromEdgedVertices )
56 import Maybes( orElse )
62 thenM :: Monad a => a b -> (b -> a c) -> a c
65 thenM_ :: Monad a => a b -> a c -> a c
69 @rnSourceDecl@ `renames' declarations.
70 It simultaneously performs dependency analysis and precedence parsing.
71 It also does the following error checks:
74 Checks that tyvars are used properly. This includes checking
75 for undefined tyvars, and tyvars in contexts that are ambiguous.
76 (Some of this checking has now been moved to module @TcMonoType@,
77 since we don't have functional dependency information at this point.)
79 Checks that all variable occurences are defined.
81 Checks the @(..)@ etc constraints in the export list.
86 -- Brings the binders of the group into scope in the appropriate places;
87 -- does NOT assume that anything is in scope already
88 rnSrcDecls :: HsGroup RdrName -> RnM (TcGblEnv, HsGroup Name)
89 -- Rename a HsGroup; used for normal source files *and* hs-boot files
90 rnSrcDecls group@(HsGroup { hs_valds = val_decls,
91 hs_tyclds = tycl_decls,
92 hs_instds = inst_decls,
93 hs_derivds = deriv_decls,
95 hs_warnds = warn_decls,
97 hs_fords = foreign_decls,
98 hs_defds = default_decls,
99 hs_ruleds = rule_decls,
100 hs_vects = vect_decls,
103 -- (A) Process the fixity declarations, creating a mapping from
104 -- FastStrings to FixItems.
105 -- Also checks for duplcates.
106 local_fix_env <- makeMiniFixityEnv fix_decls;
108 -- (B) Bring top level binders (and their fixities) into scope,
109 -- *except* for the value bindings, which get brought in below.
110 -- However *do* include class ops, data constructors
111 -- And for hs-boot files *do* include the value signatures
112 tc_avails <- getLocalNonValBinders group ;
113 tc_envs <- extendGlobalRdrEnvRn tc_avails local_fix_env ;
114 setEnvs tc_envs $ do {
116 failIfErrsM ; -- No point in continuing if (say) we have duplicate declarations
118 -- (C) Extract the mapping from data constructors to field names and
119 -- extend the record field env.
120 -- This depends on the data constructors and field names being in
121 -- scope from (B) above
122 inNewEnv (extendRecordFieldEnv tycl_decls inst_decls) $ \ _ -> do {
124 -- (D) Rename the left-hand sides of the value bindings.
125 -- This depends on everything from (B) being in scope,
126 -- and on (C) for resolving record wild cards.
127 -- It uses the fixity env from (A) to bind fixities for view patterns.
128 new_lhs <- rnTopBindsLHS local_fix_env val_decls ;
129 -- bind the LHSes (and their fixities) in the global rdr environment
130 let { val_binders = collectHsValBinders new_lhs ;
131 val_bndr_set = mkNameSet val_binders ;
132 all_bndr_set = val_bndr_set `unionNameSets` availsToNameSet tc_avails ;
133 val_avails = map Avail val_binders
135 (tcg_env, tcl_env) <- extendGlobalRdrEnvRn val_avails local_fix_env ;
136 setEnvs (tcg_env, tcl_env) $ do {
138 -- Now everything is in scope, as the remaining renaming assumes.
140 -- (E) Rename type and class decls
141 -- (note that value LHSes need to be in scope for default methods)
143 -- You might think that we could build proper def/use information
144 -- for type and class declarations, but they can be involved
145 -- in mutual recursion across modules, and we only do the SCC
146 -- analysis for them in the type checker.
147 -- So we content ourselves with gathering uses only; that
148 -- means we'll only report a declaration as unused if it isn't
149 -- mentioned at all. Ah well.
150 traceRn (text "Start rnTyClDecls") ;
151 (rn_tycl_decls, src_fvs1) <- rnTyClDecls tycl_decls ;
153 -- (F) Rename Value declarations right-hand sides
154 traceRn (text "Start rnmono") ;
155 (rn_val_decls, bind_dus) <- rnTopBindsRHS new_lhs ;
156 traceRn (text "finish rnmono" <+> ppr rn_val_decls) ;
158 -- (G) Rename Fixity and deprecations
160 -- Rename fixity declarations and error if we try to
161 -- fix something from another module (duplicates were checked in (A))
162 rn_fix_decls <- rnSrcFixityDecls all_bndr_set fix_decls ;
164 -- Rename deprec decls;
165 -- check for duplicates and ensure that deprecated things are defined locally
166 -- at the moment, we don't keep these around past renaming
167 rn_warns <- rnSrcWarnDecls all_bndr_set warn_decls ;
169 -- (H) Rename Everything else
171 (rn_inst_decls, src_fvs2) <- rnList rnSrcInstDecl inst_decls ;
172 (rn_rule_decls, src_fvs3) <- setOptM Opt_ScopedTypeVariables $
173 rnList rnHsRuleDecl rule_decls ;
174 -- Inside RULES, scoped type variables are on
175 (rn_vect_decls, src_fvs4) <- rnList rnHsVectDecl vect_decls ;
176 (rn_foreign_decls, src_fvs5) <- rnList rnHsForeignDecl foreign_decls ;
177 (rn_ann_decls, src_fvs6) <- rnList rnAnnDecl ann_decls ;
178 (rn_default_decls, src_fvs7) <- rnList rnDefaultDecl default_decls ;
179 (rn_deriv_decls, src_fvs8) <- rnList rnSrcDerivDecl deriv_decls ;
180 -- Haddock docs; no free vars
181 rn_docs <- mapM (wrapLocM rnDocDecl) docs ;
183 -- (I) Compute the results and return
184 let {rn_group = HsGroup { hs_valds = rn_val_decls,
185 hs_tyclds = rn_tycl_decls,
186 hs_instds = rn_inst_decls,
187 hs_derivds = rn_deriv_decls,
188 hs_fixds = rn_fix_decls,
189 hs_warnds = [], -- warns are returned in the tcg_env
190 -- (see below) not in the HsGroup
191 hs_fords = rn_foreign_decls,
192 hs_annds = rn_ann_decls,
193 hs_defds = rn_default_decls,
194 hs_ruleds = rn_rule_decls,
195 hs_vects = rn_vect_decls,
196 hs_docs = rn_docs } ;
198 tycl_bndrs = hsTyClDeclsBinders rn_tycl_decls rn_inst_decls ;
199 ford_bndrs = hsForeignDeclsBinders rn_foreign_decls ;
200 other_def = (Just (mkNameSet tycl_bndrs `unionNameSets` mkNameSet ford_bndrs), emptyNameSet) ;
201 other_fvs = plusFVs [src_fvs1, src_fvs2, src_fvs3, src_fvs4,
202 src_fvs5, src_fvs6, src_fvs7, src_fvs8] ;
203 -- It is tiresome to gather the binders from type and class decls
205 src_dus = [other_def] `plusDU` bind_dus `plusDU` usesOnly other_fvs ;
206 -- Instance decls may have occurrences of things bound in bind_dus
207 -- so we must put other_fvs last
209 final_tcg_env = let tcg_env' = (tcg_env `addTcgDUs` src_dus)
210 in -- we return the deprecs in the env, not in the HsGroup above
211 tcg_env' { tcg_warns = tcg_warns tcg_env' `plusWarns` rn_warns };
214 traceRn (text "finish rnSrc" <+> ppr rn_group) ;
215 traceRn (text "finish Dus" <+> ppr src_dus ) ;
216 return (final_tcg_env, rn_group)
219 -- some utils because we do this a bunch above
220 -- compute and install the new env
221 inNewEnv :: TcM TcGblEnv -> (TcGblEnv -> TcM a) -> TcM a
222 inNewEnv env cont = do e <- env
225 addTcgDUs :: TcGblEnv -> DefUses -> TcGblEnv
226 -- This function could be defined lower down in the module hierarchy,
227 -- but there doesn't seem anywhere very logical to put it.
228 addTcgDUs tcg_env dus = tcg_env { tcg_dus = tcg_dus tcg_env `plusDU` dus }
230 rnList :: (a -> RnM (b, FreeVars)) -> [Located a] -> RnM ([Located b], FreeVars)
231 rnList f xs = mapFvRn (wrapLocFstM f) xs
235 %*********************************************************
239 %*********************************************************
242 rnDocDecl :: DocDecl -> RnM DocDecl
243 rnDocDecl (DocCommentNext doc) = do
244 rn_doc <- rnHsDoc doc
245 return (DocCommentNext rn_doc)
246 rnDocDecl (DocCommentPrev doc) = do
247 rn_doc <- rnHsDoc doc
248 return (DocCommentPrev rn_doc)
249 rnDocDecl (DocCommentNamed str doc) = do
250 rn_doc <- rnHsDoc doc
251 return (DocCommentNamed str rn_doc)
252 rnDocDecl (DocGroup lev doc) = do
253 rn_doc <- rnHsDoc doc
254 return (DocGroup lev rn_doc)
258 %*********************************************************
260 Source-code fixity declarations
262 %*********************************************************
265 rnSrcFixityDecls :: NameSet -> [LFixitySig RdrName] -> RnM [LFixitySig Name]
266 -- Rename the fixity decls, so we can put
267 -- the renamed decls in the renamed syntax tree
268 -- Errors if the thing being fixed is not defined locally.
270 -- The returned FixitySigs are not actually used for anything,
271 -- except perhaps the GHCi API
272 rnSrcFixityDecls bound_names fix_decls
273 = do fix_decls <- mapM rn_decl fix_decls
274 return (concat fix_decls)
276 rn_decl :: LFixitySig RdrName -> RnM [LFixitySig Name]
277 -- GHC extension: look up both the tycon and data con
278 -- for con-like things; hence returning a list
279 -- If neither are in scope, report an error; otherwise
280 -- return a fixity sig for each (slightly odd)
281 rn_decl (L loc (FixitySig (L name_loc rdr_name) fixity))
282 = setSrcSpan name_loc $
283 -- this lookup will fail if the definition isn't local
284 do names <- lookupLocalDataTcNames bound_names what rdr_name
285 return [ L loc (FixitySig (L name_loc name) fixity)
287 what = ptext (sLit "fixity signature")
291 %*********************************************************
293 Source-code deprecations declarations
295 %*********************************************************
297 Check that the deprecated names are defined, are defined locally, and
298 that there are no duplicate deprecations.
300 It's only imported deprecations, dealt with in RnIfaces, that we
301 gather them together.
304 -- checks that the deprecations are defined locally, and that there are no duplicates
305 rnSrcWarnDecls :: NameSet -> [LWarnDecl RdrName] -> RnM Warnings
306 rnSrcWarnDecls _bound_names []
309 rnSrcWarnDecls bound_names decls
310 = do { -- check for duplicates
311 ; mapM_ (\ dups -> let (L loc rdr:lrdr':_) = dups
312 in addErrAt loc (dupWarnDecl lrdr' rdr))
314 ; pairs_s <- mapM (addLocM rn_deprec) decls
315 ; return (WarnSome ((concat pairs_s))) }
317 rn_deprec (Warning rdr_name txt)
318 -- ensures that the names are defined locally
319 = lookupLocalDataTcNames bound_names what rdr_name `thenM` \ names ->
320 return [(nameOccName name, txt) | name <- names]
322 what = ptext (sLit "deprecation")
324 -- look for duplicates among the OccNames;
325 -- we check that the names are defined above
326 -- invt: the lists returned by findDupsEq always have at least two elements
327 warn_rdr_dups = findDupsEq (\ x -> \ y -> rdrNameOcc (unLoc x) == rdrNameOcc (unLoc y))
328 (map (\ (L loc (Warning rdr_name _)) -> L loc rdr_name) decls)
330 dupWarnDecl :: Located RdrName -> RdrName -> SDoc
331 -- Located RdrName -> DeprecDecl RdrName -> SDoc
332 dupWarnDecl (L loc _) rdr_name
333 = vcat [ptext (sLit "Multiple warning declarations for") <+> quotes (ppr rdr_name),
334 ptext (sLit "also at ") <+> ppr loc]
338 %*********************************************************
340 \subsection{Annotation declarations}
342 %*********************************************************
345 rnAnnDecl :: AnnDecl RdrName -> RnM (AnnDecl Name, FreeVars)
346 rnAnnDecl (HsAnnotation provenance expr) = do
347 (provenance', provenance_fvs) <- rnAnnProvenance provenance
348 (expr', expr_fvs) <- rnLExpr expr
349 return (HsAnnotation provenance' expr', provenance_fvs `plusFV` expr_fvs)
351 rnAnnProvenance :: AnnProvenance RdrName -> RnM (AnnProvenance Name, FreeVars)
352 rnAnnProvenance provenance = do
353 provenance' <- modifyAnnProvenanceNameM lookupTopBndrRn provenance
354 return (provenance', maybe emptyFVs unitFV (annProvenanceName_maybe provenance'))
357 %*********************************************************
359 \subsection{Default declarations}
361 %*********************************************************
364 rnDefaultDecl :: DefaultDecl RdrName -> RnM (DefaultDecl Name, FreeVars)
365 rnDefaultDecl (DefaultDecl tys)
366 = mapFvRn (rnHsTypeFVs doc_str) tys `thenM` \ (tys', fvs) ->
367 return (DefaultDecl tys', fvs)
369 doc_str = text "In a `default' declaration"
372 %*********************************************************
374 \subsection{Foreign declarations}
376 %*********************************************************
379 rnHsForeignDecl :: ForeignDecl RdrName -> RnM (ForeignDecl Name, FreeVars)
380 rnHsForeignDecl (ForeignImport name ty spec)
381 = getTopEnv `thenM` \ (topEnv :: HscEnv) ->
382 lookupLocatedTopBndrRn name `thenM` \ name' ->
383 rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) ->
385 -- Mark any PackageTarget style imports as coming from the current package
386 let packageId = thisPackage $ hsc_dflags topEnv
387 spec' = patchForeignImport packageId spec
389 in return (ForeignImport name' ty' spec', fvs)
391 rnHsForeignDecl (ForeignExport name ty spec)
392 = lookupLocatedOccRn name `thenM` \ name' ->
393 rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) ->
394 return (ForeignExport name' ty' spec, fvs `addOneFV` unLoc name')
395 -- NB: a foreign export is an *occurrence site* for name, so
396 -- we add it to the free-variable list. It might, for example,
397 -- be imported from another module
399 fo_decl_msg :: Located RdrName -> SDoc
400 fo_decl_msg name = ptext (sLit "In the foreign declaration for") <+> ppr name
403 -- | For Windows DLLs we need to know what packages imported symbols are from
404 -- to generate correct calls. Imported symbols are tagged with the current
405 -- package, so if they get inlined across a package boundry we'll still
406 -- know where they're from.
408 patchForeignImport :: PackageId -> ForeignImport -> ForeignImport
409 patchForeignImport packageId (CImport cconv safety fs spec)
410 = CImport cconv safety fs (patchCImportSpec packageId spec)
412 patchCImportSpec :: PackageId -> CImportSpec -> CImportSpec
413 patchCImportSpec packageId spec
415 CFunction callTarget -> CFunction $ patchCCallTarget packageId callTarget
418 patchCCallTarget :: PackageId -> CCallTarget -> CCallTarget
419 patchCCallTarget packageId callTarget
421 StaticTarget label Nothing
422 -> StaticTarget label (Just packageId)
430 %*********************************************************
432 \subsection{Instance declarations}
434 %*********************************************************
437 rnSrcInstDecl :: InstDecl RdrName -> RnM (InstDecl Name, FreeVars)
438 rnSrcInstDecl (InstDecl inst_ty mbinds uprags ats)
439 -- Used for both source and interface file decls
440 = rnHsSigType (text "an instance decl") inst_ty `thenM` \ inst_ty' ->
442 -- Rename the bindings
443 -- The typechecker (not the renamer) checks that all
444 -- the bindings are for the right class
446 meth_names = collectMethodBinders mbinds
447 (inst_tyvars, _, cls,_) = splitHsInstDeclTy (unLoc inst_ty')
449 checkDupRdrNames meth_names `thenM_`
450 -- Check that the same method is not given twice in the
451 -- same instance decl instance C T where
455 -- We must use checkDupRdrNames because the Name of the
456 -- method is the Name of the class selector, whose SrcSpan
457 -- points to the class declaration
459 extendTyVarEnvForMethodBinds inst_tyvars (
460 -- (Slightly strangely) the forall-d tyvars scope over
461 -- the method bindings too
462 rnMethodBinds cls (\_ -> []) -- No scoped tyvars
464 ) `thenM` \ (mbinds', meth_fvs) ->
465 -- Rename the associated types
466 -- The typechecker (not the renamer) checks that all
467 -- the declarations are for the right class
469 at_names = map (head . hsTyClDeclBinders) ats
471 checkDupRdrNames at_names `thenM_`
472 -- See notes with checkDupRdrNames for methods, above
474 rnATInsts ats `thenM` \ (ats', at_fvs) ->
476 -- Rename the prags and signatures.
477 -- Note that the type variables are not in scope here,
478 -- so that instance Eq a => Eq (T a) where
479 -- {-# SPECIALISE instance Eq a => Eq (T [a]) #-}
482 -- But the (unqualified) method names are in scope
484 binders = collectHsBindsBinders mbinds'
485 bndr_set = mkNameSet binders
487 bindLocalNames binders
488 (renameSigs (Just bndr_set) okInstDclSig uprags) `thenM` \ uprags' ->
490 return (InstDecl inst_ty' mbinds' uprags' ats',
491 meth_fvs `plusFV` at_fvs
492 `plusFV` hsSigsFVs uprags'
493 `plusFV` extractHsTyNames inst_ty')
494 -- We return the renamed associated data type declarations so
495 -- that they can be entered into the list of type declarations
496 -- for the binding group, but we also keep a copy in the instance.
497 -- The latter is needed for well-formedness checks in the type
498 -- checker (eg, to ensure that all ATs of the instance actually
499 -- receive a declaration).
500 -- NB: Even the copies in the instance declaration carry copies of
501 -- the instance context after renaming. This is a bit
502 -- strange, but should not matter (and it would be more work
503 -- to remove the context).
506 Renaming of the associated types in instances.
509 rnATInsts :: [LTyClDecl RdrName] -> RnM ([LTyClDecl Name], FreeVars)
510 rnATInsts atDecls = rnList rnATInst atDecls
512 rnATInst tydecl@TyData {} = rnTyClDecl tydecl
513 rnATInst tydecl@TySynonym {} = rnTyClDecl tydecl
515 pprPanic "RnSource.rnATInsts: invalid AT instance"
516 (ppr (tcdName tydecl))
519 For the method bindings in class and instance decls, we extend the
520 type variable environment iff -fglasgow-exts
523 extendTyVarEnvForMethodBinds :: [LHsTyVarBndr Name]
524 -> RnM (Bag (LHsBind Name), FreeVars)
525 -> RnM (Bag (LHsBind Name), FreeVars)
526 extendTyVarEnvForMethodBinds tyvars thing_inside
527 = do { scoped_tvs <- xoptM Opt_ScopedTypeVariables
529 extendTyVarEnvFVRn (map hsLTyVarName tyvars) thing_inside
534 %*********************************************************
536 \subsection{Stand-alone deriving declarations}
538 %*********************************************************
541 rnSrcDerivDecl :: DerivDecl RdrName -> RnM (DerivDecl Name, FreeVars)
542 rnSrcDerivDecl (DerivDecl ty)
543 = do { standalone_deriv_ok <- xoptM Opt_StandaloneDeriving
544 ; unless standalone_deriv_ok (addErr standaloneDerivErr)
545 ; ty' <- rnLHsType (text "a deriving decl") ty
546 ; let fvs = extractHsTyNames ty'
547 ; return (DerivDecl ty', fvs) }
549 standaloneDerivErr :: SDoc
551 = hang (ptext (sLit "Illegal standalone deriving declaration"))
552 2 (ptext (sLit "Use -XStandaloneDeriving to enable this extension"))
555 %*********************************************************
559 %*********************************************************
562 rnHsRuleDecl :: RuleDecl RdrName -> RnM (RuleDecl Name, FreeVars)
563 rnHsRuleDecl (HsRule rule_name act vars lhs _fv_lhs rhs _fv_rhs)
564 = bindPatSigTyVarsFV (collectRuleBndrSigTys vars) $
565 bindLocatedLocalsFV (map get_var vars) $ \ ids ->
566 do { (vars', fv_vars) <- mapFvRn rn_var (vars `zip` ids)
567 -- NB: The binders in a rule are always Ids
568 -- We don't (yet) support type variables
570 ; (lhs', fv_lhs') <- rnLExpr lhs
571 ; (rhs', fv_rhs') <- rnLExpr rhs
573 ; checkValidRule rule_name ids lhs' fv_lhs'
575 ; return (HsRule rule_name act vars' lhs' fv_lhs' rhs' fv_rhs',
576 fv_vars `plusFV` fv_lhs' `plusFV` fv_rhs') }
578 doc = text "In the transformation rule" <+> ftext rule_name
580 get_var (RuleBndr v) = v
581 get_var (RuleBndrSig v _) = v
583 rn_var (RuleBndr (L loc _), id)
584 = return (RuleBndr (L loc id), emptyFVs)
585 rn_var (RuleBndrSig (L loc _) t, id)
586 = rnHsTypeFVs doc t `thenM` \ (t', fvs) ->
587 return (RuleBndrSig (L loc id) t', fvs)
589 badRuleVar :: FastString -> Name -> SDoc
591 = sep [ptext (sLit "Rule") <+> doubleQuotes (ftext name) <> colon,
592 ptext (sLit "Forall'd variable") <+> quotes (ppr var) <+>
593 ptext (sLit "does not appear on left hand side")]
596 Note [Rule LHS validity checking]
597 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
598 Check the shape of a transformation rule LHS. Currently we only allow
599 LHSs of the form @(f e1 .. en)@, where @f@ is not one of the
600 @forall@'d variables.
602 We used restrict the form of the 'ei' to prevent you writing rules
603 with LHSs with a complicated desugaring (and hence unlikely to match);
604 (e.g. a case expression is not allowed: too elaborate.)
606 But there are legitimate non-trivial args ei, like sections and
607 lambdas. So it seems simmpler not to check at all, and that is why
608 check_e is commented out.
611 checkValidRule :: FastString -> [Name] -> LHsExpr Name -> NameSet -> RnM ()
612 checkValidRule rule_name ids lhs' fv_lhs'
613 = do { -- Check for the form of the LHS
614 case (validRuleLhs ids lhs') of
616 Just bad -> failWithTc (badRuleLhsErr rule_name lhs' bad)
618 -- Check that LHS vars are all bound
619 ; let bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs')]
620 ; mapM_ (addErr . badRuleVar rule_name) bad_vars }
622 validRuleLhs :: [Name] -> LHsExpr Name -> Maybe (HsExpr Name)
624 -- Just e => Not ok, and e is the offending expression
625 validRuleLhs foralls lhs
628 checkl (L _ e) = check e
630 check (OpApp e1 op _ e2) = checkl op `mplus` checkl_e e1 `mplus` checkl_e e2
631 check (HsApp e1 e2) = checkl e1 `mplus` checkl_e e2
632 check (HsVar v) | v `notElem` foralls = Nothing
633 check other = Just other -- Failure
636 checkl_e (L _ _e) = Nothing -- Was (check_e e); see Note [Rule LHS validity checking]
638 {- Commented out; see Note [Rule LHS validity checking] above
639 check_e (HsVar v) = Nothing
640 check_e (HsPar e) = checkl_e e
641 check_e (HsLit e) = Nothing
642 check_e (HsOverLit e) = Nothing
644 check_e (OpApp e1 op _ e2) = checkl_e e1 `mplus` checkl_e op `mplus` checkl_e e2
645 check_e (HsApp e1 e2) = checkl_e e1 `mplus` checkl_e e2
646 check_e (NegApp e _) = checkl_e e
647 check_e (ExplicitList _ es) = checkl_es es
648 check_e other = Just other -- Fails
650 checkl_es es = foldr (mplus . checkl_e) Nothing es
653 badRuleLhsErr :: FastString -> LHsExpr Name -> HsExpr Name -> SDoc
654 badRuleLhsErr name lhs bad_e
655 = sep [ptext (sLit "Rule") <+> ftext name <> colon,
656 nest 4 (vcat [ptext (sLit "Illegal expression:") <+> ppr bad_e,
657 ptext (sLit "in left-hand side:") <+> ppr lhs])]
659 ptext (sLit "LHS must be of form (f e1 .. en) where f is not forall'd")
663 %*********************************************************
665 \subsection{Vectorisation declarations}
667 %*********************************************************
670 rnHsVectDecl :: VectDecl RdrName -> RnM (VectDecl Name, FreeVars)
671 rnHsVectDecl (HsVect var Nothing)
672 = do { var' <- wrapLocM lookupTopBndrRn var
673 ; return (HsVect var' Nothing, unitFV (unLoc var'))
675 rnHsVectDecl (HsVect var (Just rhs))
676 = do { var' <- wrapLocM lookupTopBndrRn var
677 ; (rhs', fv_rhs) <- rnLExpr rhs
678 ; return (HsVect var' (Just rhs'), fv_rhs `addOneFV` unLoc var')
682 %*********************************************************
684 \subsection{Type, class and iface sig declarations}
686 %*********************************************************
688 @rnTyDecl@ uses the `global name function' to create a new type
689 declaration in which local names have been replaced by their original
690 names, reporting any unknown names.
692 Renaming type variables is a pain. Because they now contain uniques,
693 it is necessary to pass in an association list which maps a parsed
694 tyvar to its @Name@ representation.
695 In some cases (type signatures of values),
696 it is even necessary to go over the type first
697 in order to get the set of tyvars used by it, make an assoc list,
698 and then go over it again to rename the tyvars!
699 However, we can also do some scoping checks at the same time.
702 rnTyClDecls :: [[LTyClDecl RdrName]] -> RnM ([[LTyClDecl Name]], FreeVars)
703 -- Renamed the declarations and do depedency analysis on them
705 = do { ds_w_fvs <- mapM (wrapLocFstM rnTyClDecl) (concat tycl_ds)
707 ; let sccs :: [SCC (LTyClDecl Name)]
708 sccs = depAnalTyClDecls ds_w_fvs
710 all_fvs = foldr (plusFV . snd) emptyFVs ds_w_fvs
712 ; return (map flattenSCC sccs, all_fvs) }
714 rnTyClDecl :: TyClDecl RdrName -> RnM (TyClDecl Name, FreeVars)
715 rnTyClDecl (ForeignType {tcdLName = name, tcdExtName = ext_name})
716 = lookupLocatedTopBndrRn name `thenM` \ name' ->
717 return (ForeignType {tcdLName = name', tcdExtName = ext_name},
720 -- all flavours of type family declarations ("type family", "newtype fanily",
721 -- and "data family")
722 rnTyClDecl tydecl@TyFamily {} = rnFamily tydecl bindTyVarsFV
724 -- "data", "newtype", "data instance, and "newtype instance" declarations
725 rnTyClDecl tydecl@TyData {tcdND = new_or_data, tcdCtxt = context,
726 tcdLName = tycon, tcdTyVars = tyvars,
727 tcdTyPats = typats, tcdCons = condecls,
728 tcdKindSig = sig, tcdDerivs = derivs}
729 = do { tycon' <- if isFamInstDecl tydecl
730 then lookupLocatedOccRn tycon -- may be imported family
731 else lookupLocatedTopBndrRn tycon
732 ; checkTc (h98_style || null (unLoc context))
733 (badGadtStupidTheta tycon)
734 ; ((tyvars', context', typats', derivs'), stuff_fvs)
735 <- bindTyVarsFV tyvars $ \ tyvars' -> do
736 -- Checks for distinct tyvars
737 { context' <- rnContext data_doc context
738 ; (typats', fvs1) <- rnTyPats data_doc tycon' typats
739 ; (derivs', fvs2) <- rn_derivs derivs
740 ; let fvs = fvs1 `plusFV` fvs2 `plusFV`
741 extractHsCtxtTyNames context'
742 ; return ((tyvars', context', typats', derivs'), fvs) }
744 -- For the constructor declarations, bring into scope the tyvars
745 -- bound by the header, but *only* in the H98 case
746 -- Reason: for GADTs, the type variables in the declaration
747 -- do not scope over the constructor signatures
748 -- data T a where { T1 :: forall b. b-> b }
749 ; let tc_tvs_in_scope | h98_style = hsLTyVarNames tyvars'
751 ; (condecls', con_fvs) <- bindLocalNamesFV tc_tvs_in_scope $
753 -- No need to check for duplicate constructor decls
754 -- since that is done by RnNames.extendGlobalRdrEnvRn
756 ; return (TyData {tcdND = new_or_data, tcdCtxt = context',
757 tcdLName = tycon', tcdTyVars = tyvars',
758 tcdTyPats = typats', tcdKindSig = sig,
759 tcdCons = condecls', tcdDerivs = derivs'},
760 con_fvs `plusFV` stuff_fvs)
763 h98_style = case condecls of -- Note [Stupid theta]
764 L _ (ConDecl { con_res = ResTyGADT {} }) : _ -> False
767 data_doc = text "In the data type declaration for" <+> quotes (ppr tycon)
769 rn_derivs Nothing = return (Nothing, emptyFVs)
770 rn_derivs (Just ds) = rnLHsTypes data_doc ds `thenM` \ ds' ->
771 return (Just ds', extractHsTyNames_s ds')
773 -- "type" and "type instance" declarations
774 rnTyClDecl tydecl@(TySynonym {tcdLName = name, tcdTyVars = tyvars,
775 tcdTyPats = typats, tcdSynRhs = ty})
776 = bindTyVarsFV tyvars $ \ tyvars' -> do
777 { -- Checks for distinct tyvars
778 name' <- if isFamInstDecl tydecl
779 then lookupLocatedOccRn name -- may be imported family
780 else lookupLocatedTopBndrRn name
781 ; (typats',fvs1) <- rnTyPats syn_doc name' typats
782 ; (ty', fvs2) <- rnHsTypeFVs syn_doc ty
783 ; return (TySynonym { tcdLName = name', tcdTyVars = tyvars'
784 , tcdTyPats = typats', tcdSynRhs = ty'},
785 fvs1 `plusFV` fvs2) }
787 syn_doc = text "In the declaration for type synonym" <+> quotes (ppr name)
789 rnTyClDecl (ClassDecl {tcdCtxt = context, tcdLName = cname,
790 tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs,
791 tcdMeths = mbinds, tcdATs = ats, tcdDocs = docs})
792 = do { cname' <- lookupLocatedTopBndrRn cname
794 -- Tyvars scope over superclass context and method signatures
795 ; ((tyvars', context', fds', ats', sigs'), stuff_fvs)
796 <- bindTyVarsFV tyvars $ \ tyvars' -> do
797 -- Checks for distinct tyvars
798 { context' <- rnContext cls_doc context
799 ; fds' <- rnFds cls_doc fds
800 ; (ats', at_fvs) <- rnATs ats
801 ; sigs' <- renameSigs Nothing okClsDclSig sigs
802 ; let fvs = at_fvs `plusFV`
803 extractHsCtxtTyNames context' `plusFV`
805 -- The fundeps have no free variables
806 ; return ((tyvars', context', fds', ats', sigs'), fvs) }
808 -- No need to check for duplicate associated type decls
809 -- since that is done by RnNames.extendGlobalRdrEnvRn
811 -- Check the signatures
812 -- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs).
813 ; let sig_rdr_names_w_locs = [op | L _ (TypeSig op _) <- sigs]
814 ; checkDupRdrNames sig_rdr_names_w_locs
815 -- Typechecker is responsible for checking that we only
816 -- give default-method bindings for things in this class.
817 -- The renamer *could* check this for class decls, but can't
818 -- for instance decls.
820 -- The newLocals call is tiresome: given a generic class decl
823 -- op {| x+y |} (Inl a) = ...
824 -- op {| x+y |} (Inr b) = ...
825 -- op {| a*b |} (a*b) = ...
826 -- we want to name both "x" tyvars with the same unique, so that they are
827 -- easy to group together in the typechecker.
828 ; (mbinds', meth_fvs)
829 <- extendTyVarEnvForMethodBinds tyvars' $ do
830 { name_env <- getLocalRdrEnv
831 ; let gen_rdr_tyvars_w_locs = [ tv | tv <- extractGenericPatTyVars mbinds,
832 not (unLoc tv `elemLocalRdrEnv` name_env) ]
833 -- No need to check for duplicate method signatures
834 -- since that is done by RnNames.extendGlobalRdrEnvRn
835 -- and the methods are already in scope
836 ; gen_tyvars <- newLocalBndrsRn gen_rdr_tyvars_w_locs
837 ; rnMethodBinds (unLoc cname') (mkSigTvFn sigs') gen_tyvars mbinds }
840 ; docs' <- mapM (wrapLocM rnDocDecl) docs
842 ; return (ClassDecl { tcdCtxt = context', tcdLName = cname',
843 tcdTyVars = tyvars', tcdFDs = fds', tcdSigs = sigs',
844 tcdMeths = mbinds', tcdATs = ats', tcdDocs = docs'},
845 meth_fvs `plusFV` stuff_fvs) }
847 cls_doc = text "In the declaration for class" <+> ppr cname
849 badGadtStupidTheta :: Located RdrName -> SDoc
851 = vcat [ptext (sLit "No context is allowed on a GADT-style data declaration"),
852 ptext (sLit "(You can put a context on each contructor, though.)")]
857 Trac #3850 complains about a regression wrt 6.10 for
859 There is no reason not to allow the stupid theta if there are no data
860 constructors. It's still stupid, but does no harm, and I don't want
861 to cause programs to break unnecessarily (notably HList). So if there
862 are no data constructors we allow h98_style = True
866 depAnalTyClDecls :: [(LTyClDecl Name, FreeVars)] -> [SCC (LTyClDecl Name)]
867 -- See Note [Dependency analysis of type and class decls]
868 depAnalTyClDecls ds_w_fvs
869 = stronglyConnCompFromEdgedVertices edges
871 edges = [ (d, tcdName (unLoc d), map get_assoc (nameSetToList fvs))
872 | (d, fvs) <- ds_w_fvs ]
873 get_assoc n = lookupNameEnv assoc_env n `orElse` n
874 assoc_env = mkNameEnv [ (tcdName assoc_decl, cls_name)
875 | (L _ (ClassDecl { tcdLName = L _ cls_name
876 , tcdATs = ats }) ,_) <- ds_w_fvs
877 , L _ assoc_decl <- ats ]
880 Note [Dependency analysis of type and class decls]
881 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
882 We need to do dependency analysis on type and class declarations
883 else we get bad error messages. Consider
886 data S f a = MkS f (T f a)
888 This has a kind error, but the error message is better if you
889 check T first, (fixing its kind) and *then* S. If you do kind
890 inference together, you might get an error reported in S, which
891 is jolly confusing. See Trac #4875
894 %*********************************************************
896 \subsection{Support code for type/data declarations}
898 %*********************************************************
901 rnTyPats :: SDoc -> Located Name -> Maybe [LHsType RdrName] -> RnM (Maybe [LHsType Name], FreeVars)
902 -- Although, we are processing type patterns here, all type variables will
903 -- already be in scope (they are the same as in the 'tcdTyVars' field of the
904 -- type declaration to which these patterns belong)
906 = return (Nothing, emptyFVs)
907 rnTyPats doc tc (Just typats)
908 = do { typats' <- rnLHsTypes doc typats
909 ; let fvs = addOneFV (extractHsTyNames_s typats') (unLoc tc)
910 -- type instance => use, hence addOneFV
911 ; return (Just typats', fvs) }
913 rnConDecls :: [LConDecl RdrName] -> RnM ([LConDecl Name], FreeVars)
915 = do { condecls' <- mapM (wrapLocM rnConDecl) condecls
916 ; return (condecls', plusFVs (map conDeclFVs condecls')) }
918 rnConDecl :: ConDecl RdrName -> RnM (ConDecl Name)
919 rnConDecl decl@(ConDecl { con_name = name, con_qvars = tvs
920 , con_cxt = cxt, con_details = details
921 , con_res = res_ty, con_doc = mb_doc
922 , con_old_rec = old_rec, con_explicit = expl })
923 = do { addLocM checkConName name
924 ; when old_rec (addWarn (deprecRecSyntax decl))
925 ; new_name <- lookupLocatedTopBndrRn name
927 -- For H98 syntax, the tvs are the existential ones
928 -- For GADT syntax, the tvs are all the quantified tyvars
929 -- Hence the 'filter' in the ResTyH98 case only
930 ; rdr_env <- getLocalRdrEnv
931 ; let in_scope = (`elemLocalRdrEnv` rdr_env) . unLoc
932 arg_tys = hsConDeclArgTys details
933 implicit_tvs = case res_ty of
934 ResTyH98 -> filterOut in_scope (get_rdr_tvs arg_tys)
935 ResTyGADT ty -> get_rdr_tvs (ty : arg_tys)
936 new_tvs = case expl of
938 Implicit -> userHsTyVarBndrs implicit_tvs
940 ; mb_doc' <- rnMbLHsDoc mb_doc
942 ; bindTyVarsRn new_tvs $ \new_tyvars -> do
943 { new_context <- rnContext doc cxt
944 ; new_details <- rnConDeclDetails doc details
945 ; (new_details', new_res_ty) <- rnConResult doc new_details res_ty
946 ; return (decl { con_name = new_name, con_qvars = new_tyvars, con_cxt = new_context
947 , con_details = new_details', con_res = new_res_ty, con_doc = mb_doc' }) }}
949 doc = text "In the definition of data constructor" <+> quotes (ppr name)
950 get_rdr_tvs tys = extractHsRhoRdrTyVars cxt (noLoc (HsTupleTy Boxed tys))
953 -> HsConDetails (LHsType Name) [ConDeclField Name]
955 -> RnM (HsConDetails (LHsType Name) [ConDeclField Name],
957 rnConResult _ details ResTyH98 = return (details, ResTyH98)
958 rnConResult doc details (ResTyGADT ty)
959 = do { ty' <- rnLHsType doc ty
960 ; let (arg_tys, res_ty) = splitHsFunType ty'
961 -- We can finally split it up,
962 -- now the renamer has dealt with fixities
963 -- See Note [Sorting out the result type] in RdrHsSyn
965 details' = case details of
967 PrefixCon {} -> PrefixCon arg_tys
968 InfixCon {} -> pprPanic "rnConResult" (ppr ty)
969 -- See Note [Sorting out the result type] in RdrHsSyn
971 ; when (not (null arg_tys) && case details of { RecCon {} -> True; _ -> False })
972 (addErr (badRecResTy doc))
973 ; return (details', ResTyGADT res_ty) }
975 rnConDeclDetails :: SDoc
976 -> HsConDetails (LHsType RdrName) [ConDeclField RdrName]
977 -> RnM (HsConDetails (LHsType Name) [ConDeclField Name])
978 rnConDeclDetails doc (PrefixCon tys)
979 = mapM (rnLHsType doc) tys `thenM` \ new_tys ->
980 return (PrefixCon new_tys)
982 rnConDeclDetails doc (InfixCon ty1 ty2)
983 = rnLHsType doc ty1 `thenM` \ new_ty1 ->
984 rnLHsType doc ty2 `thenM` \ new_ty2 ->
985 return (InfixCon new_ty1 new_ty2)
987 rnConDeclDetails doc (RecCon fields)
988 = do { new_fields <- rnConDeclFields doc fields
989 -- No need to check for duplicate fields
990 -- since that is done by RnNames.extendGlobalRdrEnvRn
991 ; return (RecCon new_fields) }
993 -- Rename family declarations
995 -- * This function is parametrised by the routine handling the index
996 -- variables. On the toplevel, these are defining occurences, whereas they
997 -- are usage occurences for associated types.
999 rnFamily :: TyClDecl RdrName
1000 -> ([LHsTyVarBndr RdrName] ->
1001 ([LHsTyVarBndr Name] -> RnM (TyClDecl Name, FreeVars)) ->
1002 RnM (TyClDecl Name, FreeVars))
1003 -> RnM (TyClDecl Name, FreeVars)
1005 rnFamily (tydecl@TyFamily {tcdFlavour = flavour,
1006 tcdLName = tycon, tcdTyVars = tyvars})
1008 do { bindIdxVars tyvars $ \tyvars' -> do {
1009 ; tycon' <- lookupLocatedTopBndrRn tycon
1010 ; return (TyFamily {tcdFlavour = flavour, tcdLName = tycon',
1011 tcdTyVars = tyvars', tcdKind = tcdKind tydecl},
1014 rnFamily d _ = pprPanic "rnFamily" (ppr d)
1016 -- Rename associated type declarations (in classes)
1018 -- * This can be family declarations and (default) type instances
1020 rnATs :: [LTyClDecl RdrName] -> RnM ([LTyClDecl Name], FreeVars)
1021 rnATs ats = mapFvRn (wrapLocFstM rn_at) ats
1023 rn_at (tydecl@TyFamily {}) = rnFamily tydecl lookupIdxVars
1024 rn_at (tydecl@TySynonym {}) =
1026 unless (isNothing (tcdTyPats tydecl)) $ addErr noPatterns
1028 rn_at _ = panic "RnSource.rnATs: invalid TyClDecl"
1030 lookupIdxVars tyvars cont =
1031 do { checkForDups tyvars
1032 ; tyvars' <- mapM lookupIdxVar tyvars
1035 -- Type index variables must be class parameters, which are the only
1036 -- type variables in scope at this point.
1037 lookupIdxVar (L l tyvar) =
1039 name' <- lookupOccRn (hsTyVarName tyvar)
1040 return $ L l (replaceTyVarName tyvar name')
1042 -- Type variable may only occur once.
1044 checkForDups [] = return ()
1045 checkForDups (L loc tv:ltvs) =
1046 do { setSrcSpan loc $
1047 when (hsTyVarName tv `ltvElem` ltvs) $
1048 addErr (repeatedTyVar tv)
1052 _ `ltvElem` [] = False
1053 rdrName `ltvElem` (L _ tv:ltvs)
1054 | rdrName == hsTyVarName tv = True
1055 | otherwise = rdrName `ltvElem` ltvs
1057 deprecRecSyntax :: ConDecl RdrName -> SDoc
1058 deprecRecSyntax decl
1059 = vcat [ ptext (sLit "Declaration of") <+> quotes (ppr (con_name decl))
1060 <+> ptext (sLit "uses deprecated syntax")
1061 , ptext (sLit "Instead, use the form")
1062 , nest 2 (ppr decl) ] -- Pretty printer uses new form
1064 badRecResTy :: SDoc -> SDoc
1065 badRecResTy doc = ptext (sLit "Malformed constructor signature") $$ doc
1068 noPatterns = text "Default definition for an associated synonym cannot have"
1069 <+> text "type pattern"
1071 repeatedTyVar :: HsTyVarBndr RdrName -> SDoc
1072 repeatedTyVar tv = ptext (sLit "Illegal repeated type variable") <+>
1075 -- This data decl will parse OK
1077 -- treating "a" as the constructor.
1078 -- It is really hard to make the parser spot this malformation.
1079 -- So the renamer has to check that the constructor is legal
1081 -- We can get an operator as the constructor, even in the prefix form:
1082 -- data T = :% Int Int
1083 -- from interface files, which always print in prefix form
1085 checkConName :: RdrName -> TcRn ()
1086 checkConName name = checkErr (isRdrDataCon name) (badDataCon name)
1088 badDataCon :: RdrName -> SDoc
1090 = hsep [ptext (sLit "Illegal data constructor name"), quotes (ppr name)]
1094 %*********************************************************
1096 \subsection{Support code for type/data declarations}
1098 %*********************************************************
1100 Get the mapping from constructors to fields for this module.
1101 It's convenient to do this after the data type decls have been renamed
1103 extendRecordFieldEnv :: [[LTyClDecl RdrName]] -> [LInstDecl RdrName] -> TcM TcGblEnv
1104 extendRecordFieldEnv tycl_decls inst_decls
1105 = do { tcg_env <- getGblEnv
1106 ; field_env' <- foldrM get_con (tcg_field_env tcg_env) all_data_cons
1107 ; return (tcg_env { tcg_field_env = field_env' }) }
1109 -- we want to lookup:
1110 -- (a) a datatype constructor
1111 -- (b) a record field
1112 -- knowing that they're from this module.
1113 -- lookupLocatedTopBndrRn does this, because it does a lookupGreLocalRn,
1114 -- which keeps only the local ones.
1115 lookup x = do { x' <- lookupLocatedTopBndrRn x
1116 ; return $ unLoc x'}
1118 all_data_cons :: [ConDecl RdrName]
1119 all_data_cons = [con | L _ (TyData { tcdCons = cons }) <- all_tycl_decls
1121 all_tycl_decls = at_tycl_decls ++ concat tycl_decls
1122 at_tycl_decls = instDeclATs inst_decls -- Do not forget associated types!
1124 get_con (ConDecl { con_name = con, con_details = RecCon flds })
1125 (RecFields env fld_set)
1126 = do { con' <- lookup con
1127 ; flds' <- mapM lookup (map cd_fld_name flds)
1128 ; let env' = extendNameEnv env con' flds'
1129 fld_set' = addListToNameSet fld_set flds'
1130 ; return $ (RecFields env' fld_set') }
1131 get_con _ env = return env
1134 %*********************************************************
1136 \subsection{Support code to rename types}
1138 %*********************************************************
1141 rnFds :: SDoc -> [Located (FunDep RdrName)] -> RnM [Located (FunDep Name)]
1144 = mapM (wrapLocM rn_fds) fds
1147 = rnHsTyVars doc tys1 `thenM` \ tys1' ->
1148 rnHsTyVars doc tys2 `thenM` \ tys2' ->
1149 return (tys1', tys2')
1151 rnHsTyVars :: SDoc -> [RdrName] -> RnM [Name]
1152 rnHsTyVars doc tvs = mapM (rnHsTyVar doc) tvs
1154 rnHsTyVar :: SDoc -> RdrName -> RnM Name
1155 rnHsTyVar _doc tyvar = lookupOccRn tyvar
1159 %*********************************************************
1163 %*********************************************************
1165 This code marches down the declarations, looking for the first
1166 Template Haskell splice. As it does so it
1167 a) groups the declarations into a HsGroup
1168 b) runs any top-level quasi-quotes
1171 findSplice :: [LHsDecl RdrName] -> RnM (HsGroup RdrName, Maybe (SpliceDecl RdrName, [LHsDecl RdrName]))
1172 findSplice ds = addl emptyRdrGroup ds
1174 addl :: HsGroup RdrName -> [LHsDecl RdrName]
1175 -> RnM (HsGroup RdrName, Maybe (SpliceDecl RdrName, [LHsDecl RdrName]))
1176 -- This stuff reverses the declarations (again) but it doesn't matter
1177 addl gp [] = return (gp, Nothing)
1178 addl gp (L l d : ds) = add gp l d ds
1181 add :: HsGroup RdrName -> SrcSpan -> HsDecl RdrName -> [LHsDecl RdrName]
1182 -> RnM (HsGroup RdrName, Maybe (SpliceDecl RdrName, [LHsDecl RdrName]))
1184 add gp loc (SpliceD splice@(SpliceDecl _ flag)) ds
1185 = do { -- We've found a top-level splice. If it is an *implicit* one
1186 -- (i.e. a naked top level expression)
1188 Explicit -> return ()
1189 Implicit -> do { th_on <- xoptM Opt_TemplateHaskell
1190 ; unless th_on $ setSrcSpan loc $
1191 failWith badImplicitSplice }
1193 ; return (gp, Just (splice, ds)) }
1195 badImplicitSplice = ptext (sLit "Parse error: naked expression at top level")
1198 add _ _ (QuasiQuoteD qq) _
1199 = pprPanic "Can't do QuasiQuote declarations without GHCi" (ppr qq)
1201 add gp _ (QuasiQuoteD qq) ds -- Expand quasiquotes
1202 = do { ds' <- runQuasiQuoteDecl qq
1203 ; addl gp (ds' ++ ds) }
1206 -- Class declarations: pull out the fixity signatures to the top
1207 add gp@(HsGroup {hs_tyclds = ts, hs_fixds = fs}) l (TyClD d) ds
1209 = let fsigs = [ L l f | L l (FixSig f) <- tcdSigs d ] in
1210 addl (gp { hs_tyclds = add_tycld (L l d) ts, hs_fixds = fsigs ++ fs}) ds
1212 = addl (gp { hs_tyclds = add_tycld (L l d) ts }) ds
1214 -- Signatures: fixity sigs go a different place than all others
1215 add gp@(HsGroup {hs_fixds = ts}) l (SigD (FixSig f)) ds
1216 = addl (gp {hs_fixds = L l f : ts}) ds
1217 add gp@(HsGroup {hs_valds = ts}) l (SigD d) ds
1218 = addl (gp {hs_valds = add_sig (L l d) ts}) ds
1220 -- Value declarations: use add_bind
1221 add gp@(HsGroup {hs_valds = ts}) l (ValD d) ds
1222 = addl (gp { hs_valds = add_bind (L l d) ts }) ds
1224 -- The rest are routine
1225 add gp@(HsGroup {hs_instds = ts}) l (InstD d) ds
1226 = addl (gp { hs_instds = L l d : ts }) ds
1227 add gp@(HsGroup {hs_derivds = ts}) l (DerivD d) ds
1228 = addl (gp { hs_derivds = L l d : ts }) ds
1229 add gp@(HsGroup {hs_defds = ts}) l (DefD d) ds
1230 = addl (gp { hs_defds = L l d : ts }) ds
1231 add gp@(HsGroup {hs_fords = ts}) l (ForD d) ds
1232 = addl (gp { hs_fords = L l d : ts }) ds
1233 add gp@(HsGroup {hs_warnds = ts}) l (WarningD d) ds
1234 = addl (gp { hs_warnds = L l d : ts }) ds
1235 add gp@(HsGroup {hs_annds = ts}) l (AnnD d) ds
1236 = addl (gp { hs_annds = L l d : ts }) ds
1237 add gp@(HsGroup {hs_ruleds = ts}) l (RuleD d) ds
1238 = addl (gp { hs_ruleds = L l d : ts }) ds
1239 add gp@(HsGroup {hs_vects = ts}) l (VectD d) ds
1240 = addl (gp { hs_vects = L l d : ts }) ds
1241 add gp l (DocD d) ds
1242 = addl (gp { hs_docs = (L l d) : (hs_docs gp) }) ds
1244 add_tycld :: LTyClDecl a -> [[LTyClDecl a]] -> [[LTyClDecl a]]
1245 add_tycld d [] = [[d]]
1246 add_tycld d (ds:dss) = (d:ds) : dss
1248 add_bind :: LHsBind a -> HsValBinds a -> HsValBinds a
1249 add_bind b (ValBindsIn bs sigs) = ValBindsIn (bs `snocBag` b) sigs
1250 add_bind _ (ValBindsOut {}) = panic "RdrHsSyn:add_bind"
1252 add_sig :: LSig a -> HsValBinds a -> HsValBinds a
1253 add_sig s (ValBindsIn bs sigs) = ValBindsIn bs (s:sigs)
1254 add_sig _ (ValBindsOut {}) = panic "RdrHsSyn:add_sig"