%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[RnSource]{Main pass of renamer}
\begin{code}
-#include "HsVersions.h"
-
-module RnSource ( rnSource, rnPolyType ) where
+module RnSource ( rnTyClDecl, rnIfaceRuleDecl, rnInstDecl, rnSourceDecls,
+ rnHsType, rnHsSigType, rnHsTypeFVs, rnHsSigTypeFVs
+ ) where
-import Ubiq
-import RnLoop -- *check* the RnPass/RnExpr/RnBinds loop-breaking
+#include "HsVersions.h"
+import RnExpr
import HsSyn
-import HsPragmas
-import RdrHsSyn
+import HscTypes ( GlobalRdrEnv )
+import HsTypes ( hsTyVarNames, pprHsContext )
+import RdrName ( RdrName, isRdrDataCon, elemRdrEnv )
+import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl, RdrNameTyClDecl,
+ extractRuleBndrsTyVars, extractHsTyRdrTyVars,
+ extractHsCtxtRdrTyVars, extractGenericPatTyVars
+ )
import RnHsSyn
+import HsCore
+
+import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, renameSigsFVs )
+import RnEnv ( lookupTopBndrRn, lookupOccRn, newIPName, lookupIfaceName,
+ lookupOrigNames, lookupSysBinder, newLocalsRn,
+ bindLocalsFVRn,
+ bindTyVarsRn, bindTyVars2Rn,
+ bindTyVarsFV2Rn, extendTyVarEnvFVRn,
+ bindCoreLocalRn, bindCoreLocalsRn, bindLocalNames,
+ checkDupOrQualNames, checkDupNames, mapFvRn
+ )
import RnMonad
-import RnBinds ( rnTopBinds, rnMethodBinds )
-
-import Bag ( emptyBag, unitBag, consBag, unionManyBags, listToBag, bagToList )
-import Class ( derivableClassKeys )
-import ListSetOps ( unionLists, minusList )
-import Maybes ( maybeToBool, catMaybes )
-import Name ( Name, isLocallyDefined, isAvarid, getLocalName, ExportFlag(..), RdrName )
-import Pretty
-import SrcLoc ( SrcLoc )
-import Unique ( Unique )
-import UniqFM ( addListToUFM, listToUFM )
-import UniqSet ( UniqSet(..) )
-import Util ( isIn, isn'tIn, sortLt, panic, assertPanic )
+import Class ( FunDep, DefMeth (..) )
+import DataCon ( dataConId )
+import Name ( Name, NamedThing(..) )
+import NameSet
+import PrelInfo ( derivableClassKeys, cCallishClassKeys )
+import PrelNames ( deRefStablePtr_RDR, newStablePtr_RDR,
+ bindIO_RDR, returnIO_RDR
+ )
+import TysWiredIn ( tupleCon )
+import List ( partition, nub )
+import Outputable
+import SrcLoc ( SrcLoc )
+import CmdLineOpts ( DynFlag(..) )
+ -- Warn of unused for-all'd tyvars
+import Unique ( Uniquable(..) )
+import Maybes ( maybeToBool )
+import ListSetOps ( removeDupsEq )
\end{code}
-rnSource `renames' the source module and export list.
+@rnSourceDecl@ `renames' declarations.
It simultaneously performs dependency analysis and precedence parsing.
It also does the following error checks:
\begin{enumerate}
\item
Checks that tyvars are used properly. This includes checking
for undefined tyvars, and tyvars in contexts that are ambiguous.
+(Some of this checking has now been moved to module @TcMonoType@,
+since we don't have functional dependency information at this point.)
\item
Checks that all variable occurences are defined.
\item
-Checks the (..) etc constraints in the export list.
+Checks the @(..)@ etc constraints in the export list.
\end{enumerate}
+%*********************************************************
+%* *
+\subsection{Source code declarations}
+%* *
+%*********************************************************
+
\begin{code}
-rnSource :: [Module]
- -> Bag (Module,(RnName,ExportFlag)) -- unqualified imports from module
- -> Bag RenamedFixityDecl -- fixity info for imported names
- -> RdrNameHsModule
- -> RnM s (RenamedHsModule,
- Name -> ExportFlag, -- export info
- Bag (RnName, RdrName)) -- occurrence info
-
-rnSource imp_mods unqual_imps imp_fixes
- (HsModule mod version exports _ fixes
- ty_decls specdata_sigs class_decls
- inst_decls specinst_sigs defaults
- binds _ src_loc)
+rnSourceDecls :: GlobalRdrEnv -> LocalFixityEnv
+ -> [RdrNameHsDecl]
+ -> RnMG ([RenamedHsDecl], FreeVars)
+ -- The decls get reversed, but that's ok
- = pushSrcLocRn src_loc $
+rnSourceDecls gbl_env local_fixity_env decls
+ = initRnMS gbl_env emptyRdrEnv local_fixity_env SourceMode (go emptyFVs [] decls)
+ where
+ -- Fixity and deprecations have been dealt with already; ignore them
+ go fvs ds' [] = returnRn (ds', fvs)
+ go fvs ds' (FixD _:ds) = go fvs ds' ds
+ go fvs ds' (DeprecD _:ds) = go fvs ds' ds
+ go fvs ds' (d:ds) = rnSourceDecl d `thenRn` \(d', fvs') ->
+ go (fvs `plusFV` fvs') (d':ds') ds
- rnExports (mod:imp_mods) unqual_imps exports `thenRn` \ exported_fn ->
- rnFixes fixes `thenRn` \ src_fixes ->
- let
- pair_name inf@(InfixL n _) = (n, inf)
- pair_name inf@(InfixR n _) = (n, inf)
- pair_name inf@(InfixN n _) = (n, inf)
- imp_fixes_fm = listToUFM (map pair_name (bagToList imp_fixes))
- all_fixes_fm = addListToUFM imp_fixes_fm (map pair_name src_fixes)
- in
- setExtraRn all_fixes_fm $
-
- mapRn rnTyDecl ty_decls `thenRn` \ new_ty_decls ->
- mapRn rnSpecDataSig specdata_sigs `thenRn` \ new_specdata_sigs ->
- mapRn rnClassDecl class_decls `thenRn` \ new_class_decls ->
- mapRn rnInstDecl inst_decls `thenRn` \ new_inst_decls ->
- mapRn rnSpecInstSig specinst_sigs `thenRn` \ new_specinst_sigs ->
- rnDefaultDecl defaults `thenRn` \ new_defaults ->
- rnTopBinds binds `thenRn` \ new_binds ->
-
- getOccurrenceUpRn `thenRn` \ occ_info ->
-
- returnRn (
- HsModule mod version
- trashed_exports trashed_imports src_fixes
- new_ty_decls new_specdata_sigs new_class_decls
- new_inst_decls new_specinst_sigs new_defaults
- new_binds [] src_loc,
- exported_fn,
- occ_info
- )
+rnSourceDecl :: RdrNameHsDecl -> RnMS (RenamedHsDecl, FreeVars)
+
+rnSourceDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) ->
+ returnRn (ValD new_binds, fvs)
+
+rnSourceDecl (TyClD tycl_decl)
+ = rnTyClDecl tycl_decl `thenRn` \ new_decl ->
+ finishSourceTyClDecl tycl_decl new_decl `thenRn` \ (new_decl', fvs) ->
+ returnRn (TyClD new_decl', fvs `plusFV` tyClDeclFVs new_decl')
+
+rnSourceDecl (InstD inst)
+ = rnInstDecl inst `thenRn` \ new_inst ->
+ finishSourceInstDecl inst new_inst `thenRn` \ (new_inst', fvs) ->
+ returnRn (InstD new_inst', fvs `plusFV` instDeclFVs new_inst')
+
+rnSourceDecl (RuleD rule)
+ = rnHsRuleDecl rule `thenRn` \ (new_rule, fvs) ->
+ returnRn (RuleD new_rule, fvs)
+
+rnSourceDecl (ForD ford)
+ = rnHsForeignDecl ford `thenRn` \ (new_ford, fvs) ->
+ returnRn (ForD new_ford, fvs)
+
+rnSourceDecl (DefD (DefaultDecl tys src_loc))
+ = pushSrcLocRn src_loc $
+ mapFvRn (rnHsTypeFVs doc_str) tys `thenRn` \ (tys', fvs) ->
+ returnRn (DefD (DefaultDecl tys' src_loc), fvs)
where
- trashed_exports = trace "rnSource:trashed_exports" Nothing
- trashed_imports = trace "rnSource:trashed_imports" []
+ doc_str = text "In a `default' declaration"
\end{code}
%*********************************************************
%* *
-\subsection{Export list}
+\subsection{Foreign declarations}
%* *
%*********************************************************
\begin{code}
-rnExports :: [Module]
- -> Bag (Module,(RnName,ExportFlag))
- -> Maybe [RdrNameIE]
- -> RnM s (Name -> ExportFlag)
+rnHsForeignDecl (ForeignImport name ty spec src_loc)
+ = pushSrcLocRn src_loc $
+ lookupOccRn name `thenRn` \ name' ->
+ rnHsTypeFVs (fo_decl_msg name) ty `thenRn` \ (ty', fvs1) ->
+ lookupOrigNames (extras spec) `thenRn` \ fvs2 ->
+ returnRn (ForeignImport name' ty' spec src_loc, fvs1 `plusFV` fvs2)
+ where
+ extras (CDynImport _) = [newStablePtr_RDR, deRefStablePtr_RDR, bindIO_RDR, returnIO_RDR]
+ extras other = []
-rnExports mods unqual_imps Nothing
- = returnRn (\n -> if isLocallyDefined n then ExportAll else NotExported)
+rnHsForeignDecl (ForeignExport name ty spec src_loc)
+ = pushSrcLocRn src_loc $
+ lookupOccRn name `thenRn` \ name' ->
+ rnHsTypeFVs (fo_decl_msg name) ty `thenRn` \ (ty', fvs1) ->
+ lookupOrigNames [bindIO_RDR, returnIO_RDR] `thenRn` \ fvs2 ->
+ returnRn (ForeignExport name' ty' spec src_loc, fvs1 `plusFV` fvs2)
-rnExports mods unqual_imps (Just exps)
- = mapAndUnzipRn (rnIE mods) exps `thenRn` \ (mod_maybes, exp_bags) ->
- let
- exp_mods = catMaybes mod_maybes
- exp_names = unionManyBags exp_bags
+fo_decl_msg name = ptext SLIT("The foreign declaration for") <+> ppr name
+\end{code}
- -- check for duplicate names
- -- check for duplicate modules
- -- check for duplicate local names
- -- add in module contents checking for duplicate local names
+%*********************************************************
+%* *
+\subsection{Instance declarations}
+%* *
+%*********************************************************
- -- build export flag lookup function
- exp_fn n = if isLocallyDefined n then ExportAll else NotExported
+\begin{code}
+rnInstDecl (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc)
+ -- Used for both source and interface file decls
+ = pushSrcLocRn src_loc $
+ rnHsSigType (text "an instance decl") inst_ty `thenRn` \ inst_ty' ->
+
+ (case maybe_dfun_rdr_name of
+ Nothing -> returnRn Nothing
+ Just dfun_rdr_name -> lookupIfaceName dfun_rdr_name `thenRn` \ dfun_name ->
+ returnRn (Just dfun_name)
+ ) `thenRn` \ maybe_dfun_name ->
+
+ -- The typechecker checks that all the bindings are for the right class.
+ returnRn (InstDecl inst_ty' EmptyMonoBinds [] maybe_dfun_name src_loc)
+
+-- Compare finishSourceTyClDecl
+finishSourceInstDecl (InstDecl _ mbinds uprags _ _ )
+ (InstDecl inst_ty _ _ maybe_dfun_name src_loc)
+ -- Used for both source decls only
+ = ASSERT( not (maybeToBool maybe_dfun_name) ) -- Source decl!
+ let
+ meth_doc = text "In the bindings in an instance declaration"
+ meth_names = collectLocatedMonoBinders mbinds
+ inst_tyvars = case inst_ty of
+ HsForAllTy (Just inst_tyvars) _ _ -> inst_tyvars
+ other -> []
+ -- (Slightly strangely) the forall-d tyvars scope over
+ -- the method bindings too
in
- returnRn exp_fn
-rnIE mods (IEVar name)
- = lookupValue name `thenRn` \ rn ->
- checkIEVar rn `thenRn` \ exps ->
- returnRn (Nothing, exps)
- where
- checkIEVar (RnName n) = returnRn (unitBag (n,ExportAbs))
- checkIEVar (RnUnbound _) = returnRn emptyBag
- checkIEVar rn@(RnClassOp _ _) = getSrcLocRn `thenRn` \ src_loc ->
- failButContinueRn emptyBag (classOpExportErr rn src_loc)
- checkIEVar rn = panic "checkIEVar"
-
-rnIE mods (IEThingAbs name)
- = lookupTyConOrClass name `thenRn` \ rn ->
- checkIEAbs rn `thenRn` \ exps ->
- returnRn (Nothing, exps)
- where
- checkIEAbs (RnSyn n) = returnRn (unitBag (n,ExportAbs))
- checkIEAbs (RnData n _) = returnRn (unitBag (n,ExportAbs))
- checkIEAbs (RnClass n _) = returnRn (unitBag (n,ExportAbs))
- checkIEAbs (RnUnbound _) = returnRn emptyBag
- checkIEAbs rn = panic "checkIEAbs"
-
-rnIE mods (IEThingAll name)
- = lookupTyConOrClass name `thenRn` \ rn ->
- checkIEAll rn `thenRn` \ exps ->
- returnRn (Nothing, exps)
- where
- checkIEAll (RnData n cons) = returnRn (consBag (exp_all n) (listToBag (map exp_all cons)))
- checkIEAll (RnClass n ops) = returnRn (consBag (exp_all n) (listToBag (map exp_all ops)))
- checkIEAll (RnUnbound _) = returnRn emptyBag
- checkIEAll rn@(RnSyn _) = getSrcLocRn `thenRn` \ src_loc ->
- warnAndContinueRn emptyBag (synAllExportErr rn src_loc)
- checkIEAll rn = panic "checkIEAll"
-
- exp_all n = (n, ExportAll)
-
-rnIE mods (IEThingWith name names)
- = lookupTyConOrClass name `thenRn` \ rn ->
- mapRn lookupValue names `thenRn` \ rns ->
- checkIEWith rn rns `thenRn` \ exps ->
- returnRn (Nothing, exps)
+ -- Rename the bindings
+ -- NB meth_names can be qualified!
+ checkDupNames meth_doc meth_names `thenRn_`
+ extendTyVarEnvFVRn (map hsTyVarName inst_tyvars) (
+ rnMethodBinds [] mbinds
+ ) `thenRn` \ (mbinds', meth_fvs) ->
+ let
+ binders = collectMonoBinders mbinds'
+ binder_set = mkNameSet binders
+ in
+ -- Rename the prags and signatures.
+ -- Note that the type variables are not in scope here,
+ -- so that instance Eq a => Eq (T a) where
+ -- {-# SPECIALISE instance Eq a => Eq (T [a]) #-}
+ -- works OK.
+ --
+ -- But the (unqualified) method names are in scope
+ bindLocalNames binders (
+ renameSigsFVs (okInstDclSig binder_set) uprags
+ ) `thenRn` \ (uprags', prag_fvs) ->
+
+ returnRn (InstDecl inst_ty mbinds' uprags' maybe_dfun_name src_loc,
+ meth_fvs `plusFV` prag_fvs)
+\end{code}
+
+%*********************************************************
+%* *
+\subsection{Rules}
+%* *
+%*********************************************************
+
+\begin{code}
+rnIfaceRuleDecl (IfaceRule rule_name vars fn args rhs src_loc)
+ = pushSrcLocRn src_loc $
+ lookupOccRn fn `thenRn` \ fn' ->
+ rnCoreBndrs vars $ \ vars' ->
+ mapRn rnCoreExpr args `thenRn` \ args' ->
+ rnCoreExpr rhs `thenRn` \ rhs' ->
+ returnRn (IfaceRule rule_name vars' fn' args' rhs' src_loc)
+
+rnHsRuleDecl (HsRule rule_name tvs vars lhs rhs src_loc)
+ = ASSERT( null tvs )
+ pushSrcLocRn src_loc $
+
+ bindTyVarsFV2Rn doc (map UserTyVar sig_tvs) $ \ sig_tvs' _ ->
+ bindLocalsFVRn doc (map get_var vars) $ \ ids ->
+ mapFvRn rn_var (vars `zip` ids) `thenRn` \ (vars', fv_vars) ->
+
+ rnExpr lhs `thenRn` \ (lhs', fv_lhs) ->
+ rnExpr rhs `thenRn` \ (rhs', fv_rhs) ->
+ checkRn (validRuleLhs ids lhs')
+ (badRuleLhsErr rule_name lhs') `thenRn_`
+ let
+ bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)]
+ in
+ mapRn (addErrRn . badRuleVar rule_name) bad_vars `thenRn_`
+ returnRn (HsRule rule_name sig_tvs' vars' lhs' rhs' src_loc,
+ fv_vars `plusFV` fv_lhs `plusFV` fv_rhs)
where
- checkIEWith rn@(RnData n cons) rns
- | same_names cons rns = returnRn (consBag (exp_all n) (listToBag (map exp_all cons)))
- | otherwise = rnWithErr "constructrs" rn cons rns
- checkIEWith rn@(RnClass n ops) rns
- | same_names ops rns = returnRn (consBag (exp_all n) (listToBag (map exp_all ops)))
- | otherwise = rnWithErr "class ops" rn ops rns
- checkIEWith (RnUnbound _) rns = returnRn emptyBag
- checkIEWith rn@(RnSyn _) rns = getSrcLocRn `thenRn` \ src_loc ->
- failButContinueRn emptyBag (synAllExportErr rn src_loc)
- checkIEWith rn rns = panic "checkIEWith"
-
- exp_all n = (n, ExportAll)
-
- same_names has rns
- = all (not.isRnUnbound) rns &&
- sortLt (<) (map uniqueOf has) == sortLt (<) (map uniqueOf rns)
-
- rnWithErr str rn has rns
- = getSrcLocRn `thenRn` \ src_loc ->
- failButContinueRn emptyBag (withExportErr str rn has rns src_loc)
-
-rnIE mods (IEModuleContents mod)
- | isIn "IEModule" mod mods = returnRn (Just mod, emptyBag)
- | otherwise = getSrcLocRn `thenRn` \ src_loc ->
- failButContinueRn (Nothing,emptyBag) (badModExportErr mod src_loc)
+ doc = text "In the transformation rule" <+> ptext rule_name
+ sig_tvs = extractRuleBndrsTyVars vars
+
+ get_var (RuleBndr v) = v
+ get_var (RuleBndrSig v _) = v
+
+ rn_var (RuleBndr v, id) = returnRn (RuleBndr id, emptyFVs)
+ rn_var (RuleBndrSig v t, id) = rnHsTypeFVs doc t `thenRn` \ (t', fvs) ->
+ returnRn (RuleBndrSig id t', fvs)
\end{code}
+
%*********************************************************
%* *
-\subsection{Type declarations}
+\subsection{Type, class and iface sig declarations}
%* *
%*********************************************************
Renaming type variables is a pain. Because they now contain uniques,
it is necessary to pass in an association list which maps a parsed
-tyvar to its Name representation. In some cases (type signatures of
-values), it is even necessary to go over the type first in order to
-get the set of tyvars used by it, make an assoc list, and then go over
-it again to rename the tyvars! However, we can also do some scoping
-checks at the same time.
+tyvar to its @Name@ representation.
+In some cases (type signatures of values),
+it is even necessary to go over the type first
+in order to get the set of tyvars used by it, make an assoc list,
+and then go over it again to rename the tyvars!
+However, we can also do some scoping checks at the same time.
\begin{code}
-rnTyDecl :: RdrNameTyDecl -> RnM_Fixes s RenamedTyDecl
+rnTyClDecl (IfaceSig {tcdName = name, tcdType = ty, tcdIdInfo = id_infos, tcdLoc = loc})
+ = pushSrcLocRn loc $
+ lookupTopBndrRn name `thenRn` \ name' ->
+ rnHsType doc_str ty `thenRn` \ ty' ->
+ mapRn rnIdInfo id_infos `thenRn` \ id_infos' ->
+ returnRn (IfaceSig {tcdName = name', tcdType = ty', tcdIdInfo = id_infos', tcdLoc = loc})
+ where
+ doc_str = text "In the interface signature for" <+> quotes (ppr name)
-rnTyDecl (TyData context tycon tyvars condecls derivings pragmas src_loc)
+rnTyClDecl (ForeignType {tcdName = name, tcdFoType = spec, tcdLoc = loc})
+ = pushSrcLocRn loc $
+ lookupTopBndrRn name `thenRn` \ name' ->
+ returnRn (ForeignType {tcdName = name', tcdFoType = spec, tcdLoc = loc})
+
+rnTyClDecl (TyData {tcdND = new_or_data, tcdCtxt = context, tcdName = tycon,
+ tcdTyVars = tyvars, tcdCons = condecls, tcdNCons = nconstrs,
+ tcdLoc = src_loc, tcdSysNames = sys_names})
= pushSrcLocRn src_loc $
- lookupTyCon tycon `thenRn` \ tycon' ->
- mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env, tyvars') ->
- rnContext tv_env context `thenRn` \ context' ->
- rnConDecls tv_env condecls `thenRn` \ condecls' ->
- rn_derivs tycon' src_loc derivings `thenRn` \ derivings' ->
- ASSERT(isNoDataPragmas pragmas)
- returnRn (TyData context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc)
-
-rnTyDecl (TyNew context tycon tyvars condecl derivings pragmas src_loc)
+ lookupTopBndrRn tycon `thenRn` \ tycon' ->
+ bindTyVarsRn data_doc tyvars $ \ tyvars' ->
+ rnContext data_doc context `thenRn` \ context' ->
+ checkDupOrQualNames data_doc con_names `thenRn_`
+
+ -- Check that there's at least one condecl,
+ -- or else we're reading an interface file, or -fglasgow-exts
+ (if null condecls then
+ doptRn Opt_GlasgowExts `thenRn` \ glaExts ->
+ getModeRn `thenRn` \ mode ->
+ checkRn (glaExts || isInterfaceMode mode)
+ (emptyConDeclsErr tycon)
+ else returnRn ()
+ ) `thenRn_`
+
+ mapRn rnConDecl condecls `thenRn` \ condecls' ->
+ mapRn lookupSysBinder sys_names `thenRn` \ sys_names' ->
+ returnRn (TyData {tcdND = new_or_data, tcdCtxt = context', tcdName = tycon',
+ tcdTyVars = tyvars', tcdCons = condecls', tcdNCons = nconstrs,
+ tcdDerivs = Nothing, tcdLoc = src_loc, tcdSysNames = sys_names'})
+ where
+ data_doc = text "In the data type declaration for" <+> quotes (ppr tycon)
+ con_names = map conDeclName condecls
+
+rnTyClDecl (TySynonym {tcdName = name, tcdTyVars = tyvars, tcdSynRhs = ty, tcdLoc = src_loc})
= pushSrcLocRn src_loc $
- lookupTyCon tycon `thenRn` \ tycon' ->
- mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env, tyvars') ->
- rnContext tv_env context `thenRn` \ context' ->
- rnConDecls tv_env condecl `thenRn` \ condecl' ->
- rn_derivs tycon' src_loc derivings `thenRn` \ derivings' ->
- ASSERT(isNoDataPragmas pragmas)
- returnRn (TyNew context' tycon' tyvars' condecl' derivings' noDataPragmas src_loc)
-
-rnTyDecl (TySynonym name tyvars ty src_loc)
+ doptRn Opt_GlasgowExts `thenRn` \ glaExts ->
+ lookupTopBndrRn name `thenRn` \ name' ->
+ bindTyVarsRn syn_doc tyvars $ \ tyvars' ->
+ rnHsType syn_doc (unquantify glaExts ty) `thenRn` \ ty' ->
+ returnRn (TySynonym {tcdName = name', tcdTyVars = tyvars', tcdSynRhs = ty', tcdLoc = src_loc})
+ where
+ syn_doc = text "In the declaration for type synonym" <+> quotes (ppr name)
+
+ -- For H98 we do *not* universally quantify on the RHS of a synonym
+ -- Silently discard context... but the tyvars in the rest won't be in scope
+ -- In interface files all types are quantified, so this is a no-op
+ unquantify glaExts (HsForAllTy Nothing ctxt ty) | glaExts = ty
+ unquantify glaExts ty = ty
+
+rnTyClDecl (ClassDecl {tcdCtxt = context, tcdName = cname,
+ tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs,
+ tcdSysNames = names, tcdLoc = src_loc})
+ -- Used for both source and interface file decls
= pushSrcLocRn src_loc $
- lookupTyCon name `thenRn` \ name' ->
- mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env, tyvars') ->
- rnMonoType tv_env ty `thenRn` \ ty' ->
- returnRn (TySynonym name' tyvars' ty' src_loc)
-rn_derivs tycon2 locn Nothing -- derivs not specified
- = returnRn Nothing
+ lookupTopBndrRn cname `thenRn` \ cname' ->
-rn_derivs tycon2 locn (Just ds)
- = mapRn (rn_deriv tycon2 locn) ds `thenRn` \ derivs ->
- returnRn (Just derivs)
- where
- rn_deriv tycon2 locn clas
- = lookupClass clas `thenRn` \ clas_name ->
- addErrIfRn (uniqueOf clas_name `not_elem` derivableClassKeys)
- (derivingNonStdClassErr clas locn)
- `thenRn_`
- returnRn clas_name
- where
- not_elem = isn'tIn "rn_deriv"
-\end{code}
+ -- Deal with the implicit tycon and datacon name
+ -- They aren't in scope (because they aren't visible to the user)
+ -- and what we want to do is simply look them up in the cache;
+ -- we jolly well ought to get a 'hit' there!
+ mapRn lookupSysBinder names `thenRn` \ names' ->
-@rnConDecls@ uses the `global name function' to create a new
-constructor in which local names have been replaced by their original
-names, reporting any unknown names.
+ -- Tyvars scope over bindings and context
+ bindTyVars2Rn cls_doc tyvars $ \ clas_tyvar_names tyvars' ->
-\begin{code}
-rnConDecls :: TyVarNamesEnv
- -> [RdrNameConDecl]
- -> RnM_Fixes s [RenamedConDecl]
+ -- Check the superclasses
+ rnContext cls_doc context `thenRn` \ context' ->
-rnConDecls tv_env con_decls
- = mapRn rn_decl con_decls
- where
- rn_decl (ConDecl name tys src_loc)
- = pushSrcLocRn src_loc $
- lookupValue name `thenRn` \ new_name ->
- mapRn rn_bang_ty tys `thenRn` \ new_tys ->
- returnRn (ConDecl new_name new_tys src_loc)
-
- rn_decl (ConOpDecl ty1 op ty2 src_loc)
- = pushSrcLocRn src_loc $
- lookupValue op `thenRn` \ new_op ->
- rn_bang_ty ty1 `thenRn` \ new_ty1 ->
- rn_bang_ty ty2 `thenRn` \ new_ty2 ->
- returnRn (ConOpDecl new_ty1 new_op new_ty2 src_loc)
-
- rn_decl (NewConDecl name ty src_loc)
- = pushSrcLocRn src_loc $
- lookupValue name `thenRn` \ new_name ->
- rn_mono_ty ty `thenRn` \ new_ty ->
- returnRn (NewConDecl new_name new_ty src_loc)
-
- rn_decl (RecConDecl con fields src_loc)
- = panic "rnConDecls:RecConDecl"
-
- ----------
- rn_mono_ty = rnMonoType tv_env
-
- rn_bang_ty (Banged ty)
- = rn_mono_ty ty `thenRn` \ new_ty ->
- returnRn (Banged new_ty)
- rn_bang_ty (Unbanged ty)
- = rn_mono_ty ty `thenRn` \ new_ty ->
- returnRn (Unbanged new_ty)
-\end{code}
+ -- Check the functional dependencies
+ rnFds cls_doc fds `thenRn` \ fds' ->
-%*********************************************************
-%* *
-\subsection{SPECIALIZE data pragmas}
-%* *
-%*********************************************************
+ -- Check the signatures
+ -- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs).
+ let
+ (op_sigs, non_op_sigs) = partition isClassOpSig sigs
+ sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs]
+ in
+ checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_`
+ mapRn (rnClassOp cname' clas_tyvar_names fds') op_sigs `thenRn` \ sigs' ->
+ let
+ binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ]
+ in
+ renameSigs (okClsDclSig binders) non_op_sigs `thenRn` \ non_ops' ->
-\begin{code}
-rnSpecDataSig :: RdrNameSpecDataSig
- -> RnM_Fixes s RenamedSpecDataSig
+ -- Typechecker is responsible for checking that we only
+ -- give default-method bindings for things in this class.
+ -- The renamer *could* check this for class decls, but can't
+ -- for instance decls.
-rnSpecDataSig (SpecDataSig tycon ty src_loc)
- = pushSrcLocRn src_loc $
+ returnRn (ClassDecl { tcdCtxt = context', tcdName = cname', tcdTyVars = tyvars',
+ tcdFDs = fds', tcdSigs = non_ops' ++ sigs', tcdMeths = Nothing,
+ tcdSysNames = names', tcdLoc = src_loc})
+ where
+ cls_doc = text "In the declaration for class" <+> ppr cname
+ sig_doc = text "In the signatures for class" <+> ppr cname
+
+rnClassOp clas clas_tyvars clas_fds sig@(ClassOpSig op dm_stuff ty locn)
+ = pushSrcLocRn locn $
+ lookupTopBndrRn op `thenRn` \ op_name ->
+
+ -- Check the signature
+ rnHsSigType (quotes (ppr op)) ty `thenRn` \ new_ty ->
+
+ -- Make the default-method name
+ (case dm_stuff of
+ DefMeth dm_rdr_name
+ -> -- Imported class that has a default method decl
+ -- See comments with tname, snames, above
+ lookupSysBinder dm_rdr_name `thenRn` \ dm_name ->
+ returnRn (DefMeth dm_name)
+ -- An imported class decl for a class decl that had an explicit default
+ -- method, mentions, rather than defines,
+ -- the default method, so we must arrange to pull it in
+
+ GenDefMeth -> returnRn GenDefMeth
+ NoDefMeth -> returnRn NoDefMeth
+ ) `thenRn` \ dm_stuff' ->
+
+ returnRn (ClassOpSig op_name dm_stuff' new_ty locn)
+
+finishSourceTyClDecl :: RdrNameTyClDecl -> RenamedTyClDecl -> RnMS (RenamedTyClDecl, FreeVars)
+ -- Used for source file decls only
+ -- Renames the default-bindings of a class decl
+ -- the derivings of a data decl
+finishSourceTyClDecl (TyData {tcdDerivs = Just derivs, tcdLoc = src_loc}) -- Derivings in here
+ rn_ty_decl -- Everything else is here
+ = pushSrcLocRn src_loc $
+ mapRn rnDeriv derivs `thenRn` \ derivs' ->
+ returnRn (rn_ty_decl {tcdDerivs = Just derivs'}, mkNameSet derivs')
+
+finishSourceTyClDecl (ClassDecl {tcdMeths = Just mbinds, tcdLoc = src_loc}) -- Get mbinds from here
+ rn_cls_decl@(ClassDecl {tcdTyVars = tyvars}) -- Everything else is here
+ -- There are some default-method bindings (abeit possibly empty) so
+ -- this is a source-code class declaration
+ = -- The newLocals call is tiresome: given a generic class decl
+ -- class C a where
+ -- op :: a -> a
+ -- op {| x+y |} (Inl a) = ...
+ -- op {| x+y |} (Inr b) = ...
+ -- op {| a*b |} (a*b) = ...
+ -- we want to name both "x" tyvars with the same unique, so that they are
+ -- easy to group together in the typechecker.
+ -- Hence the
+ pushSrcLocRn src_loc $
+ extendTyVarEnvFVRn (map hsTyVarName tyvars) $
+ getLocalNameEnv `thenRn` \ name_env ->
let
- tyvars = extractMonoTyNames ty
+ meth_rdr_names_w_locs = collectLocatedMonoBinders mbinds
+ gen_rdr_tyvars_w_locs = [(tv,src_loc) | tv <- extractGenericPatTyVars mbinds,
+ not (tv `elemRdrEnv` name_env)]
in
- mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env,_) ->
- lookupTyCon tycon `thenRn` \ tycon' ->
- rnMonoType tv_env ty `thenRn` \ ty' ->
- returnRn (SpecDataSig tycon' ty' src_loc)
+ checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_`
+ newLocalsRn gen_rdr_tyvars_w_locs `thenRn` \ gen_tyvars ->
+ rnMethodBinds gen_tyvars mbinds `thenRn` \ (mbinds', meth_fvs) ->
+ returnRn (rn_cls_decl {tcdMeths = Just mbinds'}, meth_fvs)
+ where
+ meth_doc = text "In the default-methods for class" <+> ppr (tcdName rn_cls_decl)
+
+finishSourceTyClDecl _ tycl_decl = returnRn (tycl_decl, emptyFVs)
+ -- Not a class or data type declaration
\end{code}
+
%*********************************************************
%* *
-\subsection{Class declarations}
+\subsection{Support code for type/data declarations}
%* *
%*********************************************************
-@rnClassDecl@ uses the `global name function' to create a new
-class declaration in which local names have been replaced by their
-original names, reporting any unknown names.
+\begin{code}
+rnDeriv :: RdrName -> RnMS Name
+rnDeriv cls
+ = lookupOccRn cls `thenRn` \ clas_name ->
+ checkRn (getUnique clas_name `elem` derivableClassKeys)
+ (derivingNonStdClassErr clas_name) `thenRn_`
+ returnRn clas_name
+\end{code}
\begin{code}
-rnClassDecl :: RdrNameClassDecl -> RnM_Fixes s RenamedClassDecl
+conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc)
+conDeclName (ConDecl n _ _ _ _ l) = (n,l)
+
+rnConDecl :: RdrNameConDecl -> RnMS RenamedConDecl
+rnConDecl (ConDecl name wkr tvs cxt details locn)
+ = pushSrcLocRn locn $
+ checkConName name `thenRn_`
+ lookupTopBndrRn name `thenRn` \ new_name ->
+
+ lookupSysBinder wkr `thenRn` \ new_wkr ->
+ -- See comments with ClassDecl
+
+ bindTyVarsRn doc tvs $ \ new_tyvars ->
+ rnContext doc cxt `thenRn` \ new_context ->
+ rnConDetails doc locn details `thenRn` \ new_details ->
+ returnRn (ConDecl new_name new_wkr new_tyvars new_context new_details locn)
+ where
+ doc = text "In the definition of data constructor" <+> quotes (ppr name)
-rnClassDecl (ClassDecl context cname tyvar sigs mbinds pragmas src_loc)
- = pushSrcLocRn src_loc $
- mkTyVarNamesEnv src_loc [tyvar] `thenRn` \ (tv_env, [tyvar']) ->
- rnContext tv_env context `thenRn` \ context' ->
- lookupClass cname `thenRn` \ cname' ->
- mapRn (rn_op cname' tv_env) sigs `thenRn` \ sigs' ->
- rnMethodBinds cname' mbinds `thenRn` \ mbinds' ->
- ASSERT(isNoClassPragmas pragmas)
- returnRn (ClassDecl context' cname' tyvar' sigs' mbinds' NoClassPragmas src_loc)
+rnConDetails doc locn (VanillaCon tys)
+ = mapRn (rnBangTy doc) tys `thenRn` \ new_tys ->
+ returnRn (VanillaCon new_tys)
+
+rnConDetails doc locn (InfixCon ty1 ty2)
+ = rnBangTy doc ty1 `thenRn` \ new_ty1 ->
+ rnBangTy doc ty2 `thenRn` \ new_ty2 ->
+ returnRn (InfixCon new_ty1 new_ty2)
+
+rnConDetails doc locn (RecCon fields)
+ = checkDupOrQualNames doc field_names `thenRn_`
+ mapRn (rnField doc) fields `thenRn` \ new_fields ->
+ returnRn (RecCon new_fields)
where
- rn_op clas tv_env (ClassOpSig op ty pragmas locn)
- = pushSrcLocRn locn $
- lookupClassOp clas op `thenRn` \ op_name ->
- rnPolyType tv_env ty `thenRn` \ new_ty ->
-
-{-
-*** Please check here that tyvar' appears in new_ty ***
-*** (used to be in tcClassSig, but it's better here)
-*** not_elem = isn'tIn "tcClassSigs"
-*** -- Check that the class type variable is mentioned
-*** checkTc (clas_tyvar `not_elem` extractTyVarTemplatesFromTy local_ty)
-*** (methodTypeLacksTyVarErr clas_tyvar (_UNPK_ op_name) src_loc) `thenTc_`
--}
-
- ASSERT(isNoClassOpPragmas pragmas)
- returnRn (ClassOpSig op_name new_ty noClassOpPragmas locn)
+ field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds]
+
+rnField doc (names, ty)
+ = mapRn lookupTopBndrRn names `thenRn` \ new_names ->
+ rnBangTy doc ty `thenRn` \ new_ty ->
+ returnRn (new_names, new_ty)
+
+rnBangTy doc (BangType s ty)
+ = rnHsType doc ty `thenRn` \ new_ty ->
+ returnRn (BangType s new_ty)
+
+-- This data decl will parse OK
+-- data T = a Int
+-- treating "a" as the constructor.
+-- It is really hard to make the parser spot this malformation.
+-- So the renamer has to check that the constructor is legal
+--
+-- We can get an operator as the constructor, even in the prefix form:
+-- data T = :% Int Int
+-- from interface files, which always print in prefix form
+
+checkConName name
+ = checkRn (isRdrDataCon name)
+ (badDataCon name)
\end{code}
%*********************************************************
%* *
-\subsection{Instance declarations}
+\subsection{Support code to rename types}
%* *
%*********************************************************
+\begin{code}
+rnHsTypeFVs :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
+rnHsTypeFVs doc_str ty
+ = rnHsType doc_str ty `thenRn` \ ty' ->
+ returnRn (ty', extractHsTyNames ty')
+
+rnHsSigTypeFVs :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
+rnHsSigTypeFVs doc_str ty
+ = rnHsSigType doc_str ty `thenRn` \ ty' ->
+ returnRn (ty', extractHsTyNames ty')
+
+rnHsSigType :: SDoc -> RdrNameHsType -> RnMS RenamedHsType
+ -- rnHsSigType is used for source-language type signatures,
+ -- which use *implicit* universal quantification.
+rnHsSigType doc_str ty
+ = rnHsType (text "In the type signature for" <+> doc_str) ty
+
+---------------------------------------
+rnHsType :: SDoc -> RdrNameHsType -> RnMS RenamedHsType
+
+rnHsType doc (HsForAllTy Nothing ctxt ty)
+ -- Implicit quantifiction in source code (no kinds on tyvars)
+ -- Given the signature C => T we universally quantify
+ -- over FV(T) \ {in-scope-tyvars}
+ = getLocalNameEnv `thenRn` \ name_env ->
+ let
+ mentioned_in_tau = extractHsTyRdrTyVars ty
+ mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt
+ mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt)
+ forall_tyvars = filter (not . (`elemRdrEnv` name_env)) mentioned
+ in
+ rnForAll doc (map UserTyVar forall_tyvars) ctxt ty
-@rnInstDecl@ uses the `global name function' to create a new of
-instance declaration in which local names have been replaced by their
-original names, reporting any unknown names.
+rnHsType doc (HsForAllTy (Just forall_tyvars) ctxt tau)
+ -- Explicit quantification.
+ -- Check that the forall'd tyvars are actually
+ -- mentioned in the type, and produce a warning if not
+ = let
+ mentioned_in_tau = extractHsTyRdrTyVars tau
+ mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt
+ mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt)
+ forall_tyvar_names = hsTyVarNames forall_tyvars
-\begin{code}
-rnInstDecl :: RdrNameInstDecl -> RnM_Fixes s RenamedInstDecl
+ -- Explicitly quantified but not mentioned in ctxt or tau
+ warn_guys = filter (`notElem` mentioned) forall_tyvar_names
+ in
+ mapRn_ (forAllWarn doc tau) warn_guys `thenRn_`
+ rnForAll doc forall_tyvars ctxt tau
+
+rnHsType doc (HsTyVar tyvar)
+ = lookupOccRn tyvar `thenRn` \ tyvar' ->
+ returnRn (HsTyVar tyvar')
+
+rnHsType doc (HsOpTy ty1 opname ty2)
+ = lookupOccRn opname `thenRn` \ name' ->
+ rnHsType doc ty1 `thenRn` \ ty1' ->
+ rnHsType doc ty2 `thenRn` \ ty2' ->
+ returnRn (HsOpTy ty1' name' ty2')
+
+rnHsType doc (HsNumTy i)
+ | i == 1 = returnRn (HsNumTy i)
+ | otherwise = failWithRn (HsNumTy i)
+ (ptext SLIT("Only unit numeric type pattern is valid"))
+
+rnHsType doc (HsFunTy ty1 ty2)
+ = rnHsType doc ty1 `thenRn` \ ty1' ->
+ -- Might find a for-all as the arg of a function type
+ rnHsType doc ty2 `thenRn` \ ty2' ->
+ -- Or as the result. This happens when reading Prelude.hi
+ -- when we find return :: forall m. Monad m -> forall a. a -> m a
+ returnRn (HsFunTy ty1' ty2')
+
+rnHsType doc (HsListTy ty)
+ = rnHsType doc ty `thenRn` \ ty' ->
+ returnRn (HsListTy ty')
+
+-- Unboxed tuples are allowed to have poly-typed arguments. These
+-- sometimes crop up as a result of CPR worker-wrappering dictionaries.
+rnHsType doc (HsTupleTy (HsTupCon _ boxity arity) tys)
+ -- Don't do lookupOccRn, because this is built-in syntax
+ -- so it doesn't need to be in scope
+ = mapRn (rnHsType doc) tys `thenRn` \ tys' ->
+ returnRn (HsTupleTy (HsTupCon tup_name boxity arity) tys')
+ where
+ tup_name = tupleTyCon_name boxity arity
+
-rnInstDecl (InstDecl cname ty mbinds from_here modname uprags pragmas src_loc)
- = pushSrcLocRn src_loc $
- lookupClass cname `thenRn` \ cname' ->
+rnHsType doc (HsAppTy ty1 ty2)
+ = rnHsType doc ty1 `thenRn` \ ty1' ->
+ rnHsType doc ty2 `thenRn` \ ty2' ->
+ returnRn (HsAppTy ty1' ty2')
- rnPolyType [] ty `thenRn` \ ty' ->
- -- [] tv_env ensures that tyvars will be foralled
+rnHsType doc (HsPredTy pred)
+ = rnPred doc pred `thenRn` \ pred' ->
+ returnRn (HsPredTy pred')
- rnMethodBinds cname' mbinds `thenRn` \ mbinds' ->
- mapRn (rn_uprag cname') uprags `thenRn` \ new_uprags ->
+rnHsTypes doc tys = mapRn (rnHsType doc) tys
+\end{code}
- ASSERT(isNoInstancePragmas pragmas)
- returnRn (InstDecl cname' ty' mbinds'
- from_here modname new_uprags noInstancePragmas src_loc)
- where
- rn_uprag class_name (SpecSig op ty using locn)
- = pushSrcLocRn src_loc $
- lookupClassOp class_name op `thenRn` \ op_name ->
- rnPolyType nullTyVarNamesEnv ty `thenRn` \ new_ty ->
- rn_using using `thenRn` \ new_using ->
- returnRn (SpecSig op_name new_ty new_using locn)
-
- rn_uprag class_name (InlineSig op locn)
- = pushSrcLocRn locn $
- lookupClassOp class_name op `thenRn` \ op_name ->
- returnRn (InlineSig op_name locn)
-
- rn_uprag class_name (DeforestSig op locn)
- = pushSrcLocRn locn $
- lookupClassOp class_name op `thenRn` \ op_name ->
- returnRn (DeforestSig op_name locn)
-
- rn_uprag class_name (MagicUnfoldingSig op str locn)
- = pushSrcLocRn locn $
- lookupClassOp class_name op `thenRn` \ op_name ->
- returnRn (MagicUnfoldingSig op_name str locn)
-
- rn_using Nothing
- = returnRn Nothing
- rn_using (Just v)
- = lookupValue v `thenRn` \ new_v ->
- returnRn (Just new_v)
+\begin{code}
+rnForAll doc forall_tyvars ctxt ty
+ = bindTyVarsRn doc forall_tyvars $ \ new_tyvars ->
+ rnContext doc ctxt `thenRn` \ new_ctxt ->
+ rnHsType doc ty `thenRn` \ new_ty ->
+ returnRn (mkHsForAllTy (Just new_tyvars) new_ctxt new_ty)
\end{code}
-%*********************************************************
-%* *
-\subsection{@SPECIALIZE instance@ user-pragmas}
-%* *
-%*********************************************************
+\begin{code}
+rnContext :: SDoc -> RdrNameContext -> RnMS RenamedContext
+rnContext doc ctxt
+ = mapRn rn_pred ctxt `thenRn` \ theta ->
+
+ -- Check for duplicate assertions
+ -- If this isn't an error, then it ought to be:
+ ifOptRn Opt_WarnMisc (
+ let
+ (_, dups) = removeDupsEq theta
+ -- We only have equality, not ordering
+ in
+ mapRn (addWarnRn . dupClassAssertWarn theta) dups
+ ) `thenRn_`
+
+ returnRn theta
+ where
+ --Someone discovered that @CCallable@ and @CReturnable@
+ -- could be used in contexts such as:
+ -- foo :: CCallable a => a -> PrimIO Int
+ -- Doing this utterly wrecks the whole point of introducing these
+ -- classes so we specifically check that this isn't being done.
+ rn_pred pred = rnPred doc pred `thenRn` \ pred'->
+ checkRn (not (bad_pred pred'))
+ (naughtyCCallContextErr pred') `thenRn_`
+ returnRn pred'
+
+ bad_pred (HsClassP clas _) = getUnique clas `elem` cCallishClassKeys
+ bad_pred other = False
+
+
+rnPred doc (HsClassP clas tys)
+ = lookupOccRn clas `thenRn` \ clas_name ->
+ rnHsTypes doc tys `thenRn` \ tys' ->
+ returnRn (HsClassP clas_name tys')
+
+rnPred doc (HsIParam n ty)
+ = newIPName n `thenRn` \ name ->
+ rnHsType doc ty `thenRn` \ ty' ->
+ returnRn (HsIParam name ty')
+\end{code}
\begin{code}
-rnSpecInstSig :: RdrNameSpecInstSig
- -> RnM_Fixes s RenamedSpecInstSig
+rnFds :: SDoc -> [FunDep RdrName] -> RnMS [FunDep Name]
-rnSpecInstSig (SpecInstSig clas ty src_loc)
- = pushSrcLocRn src_loc $
- let
- tyvars = extractMonoTyNames ty
- in
- mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env,_) ->
- lookupClass clas `thenRn` \ new_clas ->
- rnMonoType tv_env ty `thenRn` \ new_ty ->
- returnRn (SpecInstSig new_clas new_ty src_loc)
+rnFds doc fds
+ = mapRn rn_fds fds
+ where
+ rn_fds (tys1, tys2)
+ = rnHsTyVars doc tys1 `thenRn` \ tys1' ->
+ rnHsTyVars doc tys2 `thenRn` \ tys2' ->
+ returnRn (tys1', tys2')
+
+rnHsTyVars doc tvs = mapRn (rnHsTyvar doc) tvs
+rnHsTyvar doc tyvar = lookupOccRn tyvar
\end{code}
%*********************************************************
-%* *
-\subsection{Default declarations}
-%* *
+%* *
+\subsection{IdInfo}
+%* *
%*********************************************************
-@rnDefaultDecl@ uses the `global name function' to create a new set
-of default declarations in which local names have been replaced by
-their original names, reporting any unknown names.
-
\begin{code}
-rnDefaultDecl :: [RdrNameDefaultDecl] -> RnM_Fixes s [RenamedDefaultDecl]
-
-rnDefaultDecl [] = returnRn []
-rnDefaultDecl [DefaultDecl tys src_loc]
- = pushSrcLocRn src_loc $
- mapRn (rnMonoType nullTyVarNamesEnv) tys `thenRn` \ tys' ->
- returnRn [DefaultDecl tys' src_loc]
-rnDefaultDecl defs@(d:ds)
- = addErrRn (dupDefaultDeclErr defs) `thenRn_`
- rnDefaultDecl [d]
+rnIdInfo (HsWorker worker arity)
+ = lookupOccRn worker `thenRn` \ worker' ->
+ returnRn (HsWorker worker' arity)
+
+rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ expr' ->
+ returnRn (HsUnfold inline expr')
+rnIdInfo (HsStrictness str) = returnRn (HsStrictness str)
+rnIdInfo (HsArity arity) = returnRn (HsArity arity)
+rnIdInfo HsNoCafRefs = returnRn HsNoCafRefs
+rnIdInfo HsCprInfo = returnRn HsCprInfo
\end{code}
-%*************************************************************************
-%* *
-\subsection{Fixity declarations}
-%* *
-%*************************************************************************
+@UfCore@ expressions.
\begin{code}
-rnFixes :: [RdrNameFixityDecl] -> RnM s [RenamedFixityDecl]
+rnCoreExpr (UfType ty)
+ = rnHsType (text "unfolding type") ty `thenRn` \ ty' ->
+ returnRn (UfType ty')
-rnFixes fixities
- = mapRn rn_fixity fixities `thenRn` \ fixes_maybe ->
- returnRn (catMaybes fixes_maybe)
- where
- rn_fixity fix@(InfixL name i)
- = rn_fixity_pieces InfixL name i fix
- rn_fixity fix@(InfixR name i)
- = rn_fixity_pieces InfixR name i fix
- rn_fixity fix@(InfixN name i)
- = rn_fixity_pieces InfixN name i fix
-
- rn_fixity_pieces mk_fixity name i fix
- = lookupValueMaybe name `thenRn` \ maybe_res ->
- case maybe_res of
- Just res | isLocallyDefined res
- -> returnRn (Just (mk_fixity res i))
- _ -> failButContinueRn Nothing (undefinedFixityDeclErr fix)
-
-\end{code}
+rnCoreExpr (UfVar v)
+ = lookupOccRn v `thenRn` \ v' ->
+ returnRn (UfVar v')
-%*********************************************************
-%* *
-\subsection{Support code to rename types}
-%* *
-%*********************************************************
+rnCoreExpr (UfLit l)
+ = returnRn (UfLit l)
-\begin{code}
-rnPolyType :: TyVarNamesEnv
- -> RdrNamePolyType
- -> RnM_Fixes s RenamedPolyType
+rnCoreExpr (UfLitLit l ty)
+ = rnHsType (text "litlit") ty `thenRn` \ ty' ->
+ returnRn (UfLitLit l ty')
-rnPolyType tv_env (HsForAllTy tvs ctxt ty)
- = rn_poly_help tv_env tvs ctxt ty
+rnCoreExpr (UfFCall cc ty)
+ = rnHsType (text "ccall") ty `thenRn` \ ty' ->
+ returnRn (UfFCall cc ty')
-rnPolyType tv_env poly_ty@(HsPreForAllTy ctxt ty)
- = rn_poly_help tv_env forall_tyvars ctxt ty
+rnCoreExpr (UfTuple (HsTupCon _ boxity arity) args)
+ = mapRn rnCoreExpr args `thenRn` \ args' ->
+ returnRn (UfTuple (HsTupCon tup_name boxity arity) args')
where
- mentioned_tyvars = extract_poly_ty_names poly_ty
- forall_tyvars = mentioned_tyvars `minusList` domTyVarNamesEnv tv_env
-
-------------
-extract_poly_ty_names (HsPreForAllTy ctxt ty)
- = extractCtxtTyNames ctxt
- `unionLists`
- extractMonoTyNames ty
-
-------------
-rn_poly_help :: TyVarNamesEnv
- -> [RdrName]
- -> RdrNameContext
- -> RdrNameMonoType
- -> RnM_Fixes s RenamedPolyType
-
-rn_poly_help tv_env tyvars ctxt ty
- = getSrcLocRn `thenRn` \ src_loc ->
- mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env1, new_tyvars) ->
- let
- tv_env2 = catTyVarNamesEnvs tv_env1 tv_env
- in
- rnContext tv_env2 ctxt `thenRn` \ new_ctxt ->
- rnMonoType tv_env2 ty `thenRn` \ new_ty ->
- returnRn (HsForAllTy new_tyvars new_ctxt new_ty)
+ tup_name = getName (dataConId (tupleCon boxity arity))
+ -- Get the *worker* name and use that
+
+rnCoreExpr (UfApp fun arg)
+ = rnCoreExpr fun `thenRn` \ fun' ->
+ rnCoreExpr arg `thenRn` \ arg' ->
+ returnRn (UfApp fun' arg')
+
+rnCoreExpr (UfCase scrut bndr alts)
+ = rnCoreExpr scrut `thenRn` \ scrut' ->
+ bindCoreLocalRn bndr $ \ bndr' ->
+ mapRn rnCoreAlt alts `thenRn` \ alts' ->
+ returnRn (UfCase scrut' bndr' alts')
+
+rnCoreExpr (UfNote note expr)
+ = rnNote note `thenRn` \ note' ->
+ rnCoreExpr expr `thenRn` \ expr' ->
+ returnRn (UfNote note' expr')
+
+rnCoreExpr (UfLam bndr body)
+ = rnCoreBndr bndr $ \ bndr' ->
+ rnCoreExpr body `thenRn` \ body' ->
+ returnRn (UfLam bndr' body')
+
+rnCoreExpr (UfLet (UfNonRec bndr rhs) body)
+ = rnCoreExpr rhs `thenRn` \ rhs' ->
+ rnCoreBndr bndr $ \ bndr' ->
+ rnCoreExpr body `thenRn` \ body' ->
+ returnRn (UfLet (UfNonRec bndr' rhs') body')
+
+rnCoreExpr (UfLet (UfRec pairs) body)
+ = rnCoreBndrs bndrs $ \ bndrs' ->
+ mapRn rnCoreExpr rhss `thenRn` \ rhss' ->
+ rnCoreExpr body `thenRn` \ body' ->
+ returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body')
+ where
+ (bndrs, rhss) = unzip pairs
\end{code}
\begin{code}
-rnMonoType :: TyVarNamesEnv
- -> RdrNameMonoType
- -> RnM_Fixes s RenamedMonoType
-
-rnMonoType tv_env (MonoTyVar tyvar)
- = lookupTyVarName tv_env tyvar `thenRn` \ tyvar' ->
- returnRn (MonoTyVar tyvar')
+rnCoreBndr (UfValBinder name ty) thing_inside
+ = rnHsType doc ty `thenRn` \ ty' ->
+ bindCoreLocalRn name $ \ name' ->
+ thing_inside (UfValBinder name' ty')
+ where
+ doc = text "unfolding id"
+
+rnCoreBndr (UfTyBinder name kind) thing_inside
+ = bindCoreLocalRn name $ \ name' ->
+ thing_inside (UfTyBinder name' kind)
+
+rnCoreBndrs [] thing_inside = thing_inside []
+rnCoreBndrs (b:bs) thing_inside = rnCoreBndr b $ \ name' ->
+ rnCoreBndrs bs $ \ names' ->
+ thing_inside (name':names')
+\end{code}
-rnMonoType tv_env (MonoListTy ty)
- = rnMonoType tv_env ty `thenRn` \ ty' ->
- returnRn (MonoListTy ty')
+\begin{code}
+rnCoreAlt (con, bndrs, rhs)
+ = rnUfCon con `thenRn` \ con' ->
+ bindCoreLocalsRn bndrs $ \ bndrs' ->
+ rnCoreExpr rhs `thenRn` \ rhs' ->
+ returnRn (con', bndrs', rhs')
-rnMonoType tv_env (MonoFunTy ty1 ty2)
- = andRn MonoFunTy (rnMonoType tv_env ty1)
- (rnMonoType tv_env ty2)
+rnNote (UfCoerce ty)
+ = rnHsType (text "unfolding coerce") ty `thenRn` \ ty' ->
+ returnRn (UfCoerce ty')
-rnMonoType tv_env (MonoTupleTy tys)
- = mapRn (rnMonoType tv_env) tys `thenRn` \ tys' ->
- returnRn (MonoTupleTy tys')
+rnNote (UfSCC cc) = returnRn (UfSCC cc)
+rnNote UfInlineCall = returnRn UfInlineCall
+rnNote UfInlineMe = returnRn UfInlineMe
-rnMonoType tv_env (MonoTyApp name tys)
- = let
- lookup_fn = if isAvarid (getLocalName name)
- then lookupTyVarName tv_env
- else lookupTyCon
- in
- lookup_fn name `thenRn` \ name' ->
- mapRn (rnMonoType tv_env) tys `thenRn` \ tys' ->
- returnRn (MonoTyApp name' tys')
-\end{code}
-\begin{code}
-rnContext :: TyVarNamesEnv -> RdrNameContext -> RnM_Fixes s RenamedContext
+rnUfCon UfDefault
+ = returnRn UfDefault
-rnContext tv_env ctxt
- = mapRn rn_ctxt ctxt
+rnUfCon (UfTupleAlt (HsTupCon _ boxity arity))
+ = returnRn (UfTupleAlt (HsTupCon tup_name boxity arity))
where
- rn_ctxt (clas, tyvar)
- = lookupClass clas `thenRn` \ clas_name ->
- lookupTyVarName tv_env tyvar `thenRn` \ tyvar_name ->
- returnRn (clas_name, tyvar_name)
+ tup_name = getName (tupleCon boxity arity)
+
+rnUfCon (UfDataAlt con)
+ = lookupOccRn con `thenRn` \ con' ->
+ returnRn (UfDataAlt con')
+
+rnUfCon (UfLitAlt lit)
+ = returnRn (UfLitAlt lit)
+
+rnUfCon (UfLitLitAlt lit ty)
+ = rnHsType (text "litlit") ty `thenRn` \ ty' ->
+ returnRn (UfLitLitAlt lit ty')
\end{code}
+%*********************************************************
+%* *
+\subsection{Rule shapes}
+%* *
+%*********************************************************
+
+Check the shape of a transformation rule LHS. Currently
+we only allow LHSs of the form @(f e1 .. en)@, where @f@ is
+not one of the @forall@'d variables.
\begin{code}
-classOpExportErr op locn sty
- = ppHang (ppStr "Class operation can only be exported with class:")
- 4 (ppCat [ppr sty op, ppr sty locn])
-
-synAllExportErr syn locn sty
- = ppHang (ppStr "Type synonym should be exported abstractly:")
- 4 (ppCat [ppr sty syn, ppr sty locn])
-
-withExportErr str rn has rns locn sty
- = ppHang (ppBesides [ppStr "Inconsistent list of ", ppStr str, ppStr ": ", ppr sty locn])
- 4 (ppAbove (ppCat [ppStr "expected:", ppInterleave ppComma (map (ppr sty) has)])
- (ppCat [ppStr "found: ", ppInterleave ppComma (map (ppr sty) rns)]))
-
-badModExportErr mod locn sty
- = ppHang (ppStr "Unknown module in export list:")
- 4 (ppCat [ppStr "module", ppPStr mod, ppr sty locn])
-
-derivingNonStdClassErr clas locn sty
- = ppHang (ppStr "Non-standard class in deriving:")
- 4 (ppCat [ppr sty clas, ppr sty locn])
-
-dupDefaultDeclErr defs sty
- = ppHang (ppStr "Duplicate default declarations:")
- 4 (ppAboves (map pp_def_loc defs))
+validRuleLhs foralls lhs
+ = check lhs
where
- pp_def_loc (DefaultDecl _ src_loc) = ppr sty src_loc
+ check (OpApp _ op _ _) = check op
+ check (HsApp e1 e2) = check e1
+ check (HsVar v) | v `notElem` foralls = True
+ check other = False
+\end{code}
+
-undefinedFixityDeclErr decl sty
- = ppHang (ppStr "Fixity declaration for unknown operator:")
- 4 (ppr sty decl)
+%*********************************************************
+%* *
+\subsection{Errors}
+%* *
+%*********************************************************
+
+\begin{code}
+derivingNonStdClassErr clas
+ = hsep [ptext SLIT("non-standard class"), ppr clas, ptext SLIT("in deriving clause")]
+
+badDataCon name
+ = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)]
+
+forAllWarn doc ty tyvar
+ = ifOptRn Opt_WarnUnusedMatches $
+ getModeRn `thenRn` \ mode ->
+ case mode of {
+#ifndef DEBUG
+ InterfaceMode -> returnRn () ; -- Don't warn of unused tyvars in interface files
+ -- unless DEBUG is on, in which case it is slightly
+ -- informative. They can arise from mkRhsTyLam,
+#endif -- leading to (say) f :: forall a b. [b] -> [b]
+ other ->
+ addWarnRn (
+ sep [ptext SLIT("The universally quantified type variable") <+> quotes (ppr tyvar),
+ nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))]
+ $$
+ doc
+ )
+ }
+
+badRuleLhsErr name lhs
+ = sep [ptext SLIT("Rule") <+> ptext name <> colon,
+ nest 4 (ptext SLIT("Illegal left-hand side:") <+> ppr lhs)]
+ $$
+ ptext SLIT("LHS must be of form (f e1 .. en) where f is not forall'd")
+
+badRuleVar name var
+ = sep [ptext SLIT("Rule") <+> doubleQuotes (ptext name) <> colon,
+ ptext SLIT("Forall'd variable") <+> quotes (ppr var) <+>
+ ptext SLIT("does not appear on left hand side")]
+
+dupClassAssertWarn ctxt (assertion : dups)
+ = sep [hsep [ptext SLIT("Duplicate class assertion"),
+ quotes (ppr assertion),
+ ptext SLIT("in the context:")],
+ nest 4 (pprHsContext ctxt <+> ptext SLIT("..."))]
+
+naughtyCCallContextErr (HsClassP clas _)
+ = sep [ptext SLIT("Can't use class") <+> quotes (ppr clas),
+ ptext SLIT("in a context")]
+emptyConDeclsErr tycon
+ = sep [quotes (ppr tycon) <+> ptext SLIT("has no constructors"),
+ nest 4 (ptext SLIT("(-fglasgow-exts permits this)"))]
\end{code}
projects / ghc-hetmet.git / blobdiff