%
-% (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 ( rnDecl, rnSourceDecls, rnHsType, rnHsSigType ) where
-import Ubiq
-import RnLoop -- *check* the RnPass/RnExpr/RnBinds loop-breaking
+#include "HsVersions.h"
+import RnExpr
import HsSyn
import HsPragmas
-import RdrHsSyn
+import HsTypes ( getTyVarName, pprHsContext )
+import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, isRdrTyVar, mkRdrNameWkr )
+import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl,
+ extractRuleBndrsTyVars, extractHsTyRdrTyVars,
+ extractHsTysRdrTyVars, extractHsCtxtRdrTyVars
+ )
import RnHsSyn
+import HsCore
+
+import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, unknownSigErr )
+import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn, getIPName,
+ lookupImplicitOccRn, lookupImplicitOccsRn,
+ bindLocalsRn, bindLocalRn, bindLocalsFVRn, bindUVarRn,
+ bindTyVarsFVRn, bindTyVarsFV2Rn, extendTyVarEnvFVRn,
+ bindCoreLocalFVRn, bindCoreLocalsFVRn,
+ checkDupOrQualNames, checkDupNames,
+ mkImportedGlobalName, mkImportedGlobalFromRdrName,
+ newDFunName, getDFunKey, newImplicitBinder,
+ FreeVars, emptyFVs, plusFV, plusFVs, unitFV,
+ addOneFV, 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 FunDeps ( oclose )
+import Class ( FunDep )
+
+import Name ( Name, OccName,
+ ExportFlag(..), Provenance(..),
+ nameOccName, NamedThing(..)
+ )
+import NameSet
+import OccName ( mkDefaultMethodOcc )
+import FiniteMap ( elemFM )
+import PrelInfo ( derivableClassKeys, cCallishClassKeys,
+ deRefStablePtr_RDR, makeStablePtr_RDR,
+ bindIO_RDR, returnIO_RDR
+ )
+import Bag ( bagToList )
+import List ( partition, nub )
+import Outputable
import SrcLoc ( SrcLoc )
-import Unique ( Unique )
-import UniqFM ( addListToUFM, listToUFM )
-import UniqSet ( UniqSet(..) )
-import Util ( isIn, isn'tIn, sortLt, panic, assertPanic )
-
+import CmdLineOpts ( opt_GlasgowExts, opt_WarnUnusedMatches ) -- Warn of unused for-all'd tyvars
+import Unique ( Uniquable(..) )
+import ErrUtils ( Message )
+import CStrings ( isCLabelString )
+import Maybes ( maybeToBool, catMaybes )
+import Util
\end{code}
-rnSource `renames' the source module and export list.
+@rnDecl@ `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}
-\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)
-
- = pushSrcLocRn src_loc $
+%*********************************************************
+%* *
+\subsection{Value declarations}
+%* *
+%*********************************************************
- 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)
+\begin{code}
+rnSourceDecls :: [RdrNameHsDecl] -> RnMS ([RenamedHsDecl], FreeVars)
+ -- The decls get reversed, but that's ok
- 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
- )
+rnSourceDecls decls
+ = go emptyFVs [] decls
where
- trashed_exports = trace "rnSource:trashed_exports" Nothing
- trashed_imports = trace "rnSource:trashed_imports" []
+ -- 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) = rnDecl d `thenRn` \(d', fvs') ->
+ go (fvs `plusFV` fvs') (d':ds') ds
\end{code}
%*********************************************************
%* *
-\subsection{Export list}
+\subsection{Value declarations}
%* *
%*********************************************************
\begin{code}
-rnExports :: [Module]
- -> Bag (Module,(RnName,ExportFlag))
- -> Maybe [RdrNameIE]
- -> RnM s (Name -> ExportFlag)
+-- rnDecl does all the work
+rnDecl :: RdrNameHsDecl -> RnMS (RenamedHsDecl, FreeVars)
-rnExports mods unqual_imps Nothing
- = returnRn (\n -> if isLocallyDefined n then ExportAll else NotExported)
+rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) ->
+ returnRn (ValD new_binds, fvs)
-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
-
- -- check for duplicate names
- -- check for duplicate modules
-
- -- check for duplicate local names
- -- add in module contents checking for duplicate local names
-
- -- build export flag lookup function
- exp_fn n = if isLocallyDefined n then ExportAll else NotExported
- in
- returnRn exp_fn
-rnIE mods (IEVar name)
- = lookupValue name `thenRn` \ rn ->
- checkIEVar rn `thenRn` \ exps ->
- returnRn (Nothing, exps)
+rnDecl (SigD (IfaceSig name ty id_infos loc))
+ = pushSrcLocRn loc $
+ mkImportedGlobalFromRdrName name `thenRn` \ name' ->
+ rnHsType doc_str ty `thenRn` \ (ty',fvs1) ->
+ mapFvRn rnIdInfo id_infos `thenRn` \ (id_infos', fvs2) ->
+ returnRn (SigD (IfaceSig name' ty' id_infos' loc), fvs1 `plusFV` fvs2)
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)
- 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_str = text "the interface signature for" <+> quotes (ppr name)
\end{code}
%*********************************************************
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
-
-rnTyDecl (TyData context tycon tyvars condecls derivings pragmas src_loc)
+rnDecl (TyClD (TyData new_or_data context tycon tyvars condecls nconstrs derivings pragmas 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 condecls `thenRn` \ condecls' ->
- rn_derivs tycon' src_loc derivings `thenRn` \ derivings' ->
+ lookupBndrRn tycon `thenRn` \ tycon' ->
+ bindTyVarsFVRn data_doc tyvars $ \ tyvars' ->
+ rnContext data_doc context `thenRn` \ (context', cxt_fvs) ->
+ checkDupOrQualNames data_doc con_names `thenRn_`
+ mapFvRn rnConDecl condecls `thenRn` \ (condecls', con_fvs) ->
+ rnDerivs derivings `thenRn` \ (derivings', deriv_fvs) ->
ASSERT(isNoDataPragmas pragmas)
- returnRn (TyData context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc)
+ returnRn (TyClD (TyData new_or_data context' tycon' tyvars' condecls' nconstrs
+ derivings' noDataPragmas src_loc),
+ cxt_fvs `plusFV` con_fvs `plusFV` deriv_fvs)
+ where
+ data_doc = text "the data type declaration for" <+> quotes (ppr tycon)
+ con_names = map conDeclName condecls
-rnTyDecl (TyNew context tycon tyvars condecl derivings pragmas src_loc)
+rnDecl (TyClD (TySynonym name tyvars ty 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)
+ lookupBndrRn name `thenRn` \ name' ->
+ bindTyVarsFVRn syn_doc tyvars $ \ tyvars' ->
+ rnHsType syn_doc (unquantify ty) `thenRn` \ (ty', ty_fvs) ->
+ returnRn (TyClD (TySynonym name' tyvars' ty' src_loc), ty_fvs)
+ where
+ syn_doc = text "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
+ unquantify (HsForAllTy Nothing ctxt ty) | not opt_GlasgowExts = ty
+ unquantify ty = ty
-rnTyDecl (TySynonym name tyvars ty src_loc)
+rnDecl (TyClD (ClassDecl context cname tyvars fds sigs mbinds pragmas
+ tname dname dwname snames src_loc))
= 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
+ lookupBndrRn 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!
+ -- So the 'Imported' part of this call is not relevant.
+ -- Unclean; but since these two are the only place this happens
+ -- I can't work up the energy to do it more beautifully
+ mkImportedGlobalFromRdrName tname `thenRn` \ tname' ->
+ mkImportedGlobalFromRdrName dname `thenRn` \ dname' ->
+ mkImportedGlobalFromRdrName dwname `thenRn` \ dwname' ->
+ mapRn mkImportedGlobalFromRdrName snames `thenRn` \ snames' ->
-@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
+ bindTyVarsFV2Rn 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', cxt_fvs) ->
-rnConDecls tv_env con_decls
- = mapRn rn_decl con_decls
+ -- Check the functional dependencies
+ rnFds cls_doc fds `thenRn` \ (fds', fds_fvs) ->
+
+ -- Check the signatures
+ let
+ -- First process the class op sigs, then the fixity sigs.
+ (op_sigs, non_op_sigs) = partition isClassOpSig sigs
+ in
+ checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_`
+ mapFvRn (rn_op cname' clas_tyvar_names fds') op_sigs `thenRn` \ (sigs', sig_fvs) ->
+ let
+ binders = mkNameSet [ nm | (ClassOpSig nm _ _ _ _) <- sigs' ]
+ in
+ renameSigs (okClsDclSig binders) non_op_sigs `thenRn` \ (non_ops', fix_fvs) ->
+
+ -- Check the methods
+ checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_`
+ rnMethodBinds mbinds
+ `thenRn` \ (mbinds', meth_fvs) ->
+
+ -- 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.
+
+ ASSERT(isNoClassPragmas pragmas)
+ returnRn (TyClD (ClassDecl context' cname' tyvars' fds' (non_ops' ++ sigs') mbinds'
+ NoClassPragmas tname' dname' dwname' snames' src_loc),
+ sig_fvs `plusFV`
+ fix_fvs `plusFV`
+ cxt_fvs `plusFV`
+ fds_fvs `plusFV`
+ meth_fvs
+ )
+ )
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)
+ cls_doc = text "the declaration for class" <+> ppr cname
+ sig_doc = text "the signatures for class" <+> ppr cname
+ meth_doc = text "the default-methods for class" <+> ppr cname
+
+ sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ _ locn <- sigs]
+ meth_rdr_names_w_locs = bagToList (collectMonoBinders mbinds)
+ meth_rdr_names = map fst meth_rdr_names_w_locs
+
+ rn_op clas clas_tyvars clas_fds sig@(ClassOpSig op dm_rdr_name explicit_dm ty locn)
+ = pushSrcLocRn locn $
+ lookupBndrRn op `thenRn` \ op_name ->
+
+ -- Check the signature
+ rnHsSigType (quotes (ppr op)) ty `thenRn` \ (new_ty, op_ty_fvs) ->
+ let
+ check_in_op_ty clas_tyvar =
+ checkRn (clas_tyvar `elemNameSet` oclose clas_fds op_ty_fvs)
+ (classTyVarNotInOpTyErr clas_tyvar sig)
+ in
+ mapRn_ check_in_op_ty clas_tyvars `thenRn_`
+
+ -- Make the default-method name
+ getModeRn `thenRn` \ mode ->
+ (case mode of
+ SourceMode -> -- Source class decl
+ newImplicitBinder (mkDefaultMethodOcc (rdrNameOcc op)) locn `thenRn` \ dm_name ->
+ returnRn (dm_name, op `elem` meth_rdr_names, emptyFVs)
+
+ InterfaceMode
+ -> -- Imported class that has a default method decl
+ -- See comments with tname, snames, above
+ lookupImplicitOccRn dm_rdr_name `thenRn` \ dm_name ->
+ returnRn (dm_name, explicit_dm, if explicit_dm then unitFV dm_name else emptyFVs)
+ -- 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
+ ) `thenRn` \ (dm_name, final_explicit_dm, dm_fvs) ->
+
+ returnRn (ClassOpSig op_name dm_name final_explicit_dm new_ty locn, op_ty_fvs `plusFV` dm_fvs)
\end{code}
+
%*********************************************************
%* *
-\subsection{SPECIALIZE data pragmas}
+\subsection{Instance declarations}
%* *
%*********************************************************
\begin{code}
-rnSpecDataSig :: RdrNameSpecDataSig
- -> RnM_Fixes s RenamedSpecDataSig
-
-rnSpecDataSig (SpecDataSig tycon ty src_loc)
+rnDecl (InstD (InstDecl inst_ty mbinds uprags dfun_rdr_name src_loc))
= pushSrcLocRn src_loc $
+ rnHsSigType (text "an instance decl") inst_ty `thenRn` \ (inst_ty', inst_fvs) ->
let
- tyvars = extractMonoTyNames ty
+ 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
+
+ -- Rename the bindings
+ -- NB meth_names can be qualified!
+ checkDupNames meth_doc meth_names `thenRn_`
+ extendTyVarEnvFVRn inst_tyvars (
+ rnMethodBinds mbinds
+ ) `thenRn` \ (mbinds', meth_fvs) ->
+ let
+ binders = mkNameSet (map fst (bagToList (collectMonoBinders mbinds')))
in
- mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env,_) ->
- lookupTyCon tycon `thenRn` \ tycon' ->
- rnMonoType tv_env ty `thenRn` \ ty' ->
- returnRn (SpecDataSig tycon' ty' src_loc)
+ -- 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.
+ renameSigs (okInstDclSig binders) uprags `thenRn` \ (new_uprags, prag_fvs) ->
+
+ getModeRn `thenRn` \ mode ->
+ (case mode of
+ InterfaceMode -> lookupImplicitOccRn dfun_rdr_name `thenRn` \ dfun_name ->
+ returnRn (dfun_name, unitFV dfun_name)
+ SourceMode -> newDFunName (getDFunKey inst_ty') src_loc
+ `thenRn` \ dfun_name ->
+ returnRn (dfun_name, emptyFVs)
+ )
+ `thenRn` \ (dfun_name, dfun_fv) ->
+
+ -- The typechecker checks that all the bindings are for the right class.
+ returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags dfun_name src_loc),
+ inst_fvs `plusFV` meth_fvs `plusFV` prag_fvs `plusFV` dfun_fv)
+ where
+ meth_doc = text "the bindings in an instance declaration"
+ meth_names = bagToList (collectMonoBinders mbinds)
\end{code}
%*********************************************************
%* *
-\subsection{Class declarations}
+\subsection{Default 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}
-rnClassDecl :: RdrNameClassDecl -> RnM_Fixes s RenamedClassDecl
-
-rnClassDecl (ClassDecl context cname tyvar sigs mbinds pragmas src_loc)
+rnDecl (DefD (DefaultDecl tys 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)
+ rnHsTypes doc_str tys `thenRn` \ (tys', fvs) ->
+ returnRn (DefD (DefaultDecl tys' src_loc), fvs)
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)
+ doc_str = text "a `default' declaration"
\end{code}
-
%*********************************************************
%* *
-\subsection{Instance declarations}
+\subsection{Foreign declarations}
%* *
%*********************************************************
-
-@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.
-
\begin{code}
-rnInstDecl :: RdrNameInstDecl -> RnM_Fixes s RenamedInstDecl
-
-rnInstDecl (InstDecl cname ty mbinds from_here modname uprags pragmas src_loc)
+rnDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc))
= pushSrcLocRn src_loc $
- lookupClass cname `thenRn` \ cname' ->
+ lookupOccRn name `thenRn` \ name' ->
+ let
+ extra_fvs FoExport
+ | isDyn =
+ lookupImplicitOccsRn [makeStablePtr_RDR, deRefStablePtr_RDR,
+ bindIO_RDR, returnIO_RDR]
+ | otherwise =
+ lookupImplicitOccsRn [bindIO_RDR, returnIO_RDR] `thenRn` \ fvs ->
+ returnRn (addOneFV fvs name')
+ extra_fvs other = returnRn emptyFVs
+ in
+ checkRn (ok_ext_nm ext_nm) (badExtName ext_nm) `thenRn_`
- rnPolyType [] ty `thenRn` \ ty' ->
- -- [] tv_env ensures that tyvars will be foralled
+ extra_fvs imp_exp `thenRn` \ fvs1 ->
- rnMethodBinds cname' mbinds `thenRn` \ mbinds' ->
- mapRn (rn_uprag cname') uprags `thenRn` \ new_uprags ->
+ rnHsSigType fo_decl_msg ty `thenRn` \ (ty', fvs2) ->
+ returnRn (ForD (ForeignDecl name' imp_exp ty' ext_nm cconv src_loc),
+ fvs1 `plusFV` fvs2)
+ where
+ fo_decl_msg = ptext SLIT("a foreign declaration")
+ isDyn = isDynamicExtName ext_nm
- 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)
+ ok_ext_nm Dynamic = True
+ ok_ext_nm (ExtName nm (Just mb)) = isCLabelString nm && isCLabelString mb
+ ok_ext_nm (ExtName nm Nothing) = isCLabelString nm
\end{code}
%*********************************************************
%* *
-\subsection{@SPECIALIZE instance@ user-pragmas}
+\subsection{Rules}
%* *
%*********************************************************
\begin{code}
-rnSpecInstSig :: RdrNameSpecInstSig
- -> RnM_Fixes s RenamedSpecInstSig
-
-rnSpecInstSig (SpecInstSig clas ty src_loc)
- = pushSrcLocRn src_loc $
+rnDecl (RuleD (IfaceRule rule_name vars fn args rhs src_loc))
+ = pushSrcLocRn src_loc $
+ lookupOccRn fn `thenRn` \ fn' ->
+ rnCoreBndrs vars $ \ vars' ->
+ mapFvRn rnCoreExpr args `thenRn` \ (args', fvs1) ->
+ rnCoreExpr rhs `thenRn` \ (rhs', fvs2) ->
+ returnRn (RuleD (IfaceRule rule_name vars' fn' args' rhs' src_loc),
+ (fvs1 `plusFV` fvs2) `addOneFV` fn')
+
+rnDecl (RuleD (IfaceRuleOut fn rule))
+ -- This one is used for BuiltInRules
+ -- The rule itself is already done, but the thing
+ -- to attach it to is not.
+ = lookupOccRn fn `thenRn` \ fn' ->
+ returnRn (RuleD (IfaceRuleOut fn' rule), unitFV fn')
+
+rnDecl (RuleD (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
- tyvars = extractMonoTyNames ty
+ bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)]
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)
+ mapRn (addErrRn . badRuleVar rule_name) bad_vars `thenRn_`
+ returnRn (RuleD (HsRule rule_name sig_tvs' vars' lhs' rhs' src_loc),
+ fv_vars `plusFV` fv_lhs `plusFV` fv_rhs)
+ where
+ doc = text "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) = rnHsType doc t `thenRn` \ (t', fvs) ->
+ returnRn (RuleBndrSig id t', fvs)
\end{code}
+
%*********************************************************
%* *
-\subsection{Default declarations}
+\subsection{Support code for type/data declarations}
%* *
%*********************************************************
-@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]
+rnDerivs :: Maybe [RdrName] -> RnMS (Maybe [Name], FreeVars)
-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]
-\end{code}
+rnDerivs Nothing -- derivs not specified
+ = returnRn (Nothing, emptyFVs)
-%*************************************************************************
-%* *
-\subsection{Fixity declarations}
-%* *
-%*************************************************************************
+rnDerivs (Just clss)
+ = mapRn do_one clss `thenRn` \ clss' ->
+ returnRn (Just clss', mkNameSet clss')
+ where
+ do_one cls = lookupOccRn cls `thenRn` \ clas_name ->
+ checkRn (getUnique clas_name `elem` derivableClassKeys)
+ (derivingNonStdClassErr clas_name) `thenRn_`
+ returnRn clas_name
+\end{code}
\begin{code}
-rnFixes :: [RdrNameFixityDecl] -> RnM s [RenamedFixityDecl]
+conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc)
+conDeclName (ConDecl n _ _ _ _ l) = (n,l)
+
+rnConDecl :: RdrNameConDecl -> RnMS (RenamedConDecl, FreeVars)
+rnConDecl (ConDecl name wkr tvs cxt details locn)
+ = pushSrcLocRn locn $
+ checkConName name `thenRn_`
+ lookupBndrRn name `thenRn` \ new_name ->
+
+ mkImportedGlobalFromRdrName wkr `thenRn` \ new_wkr ->
+ -- See comments with ClassDecl
+
+ bindTyVarsFVRn doc tvs $ \ new_tyvars ->
+ rnContext doc cxt `thenRn` \ (new_context, cxt_fvs) ->
+ rnConDetails doc locn details `thenRn` \ (new_details, det_fvs) ->
+ returnRn (ConDecl new_name new_wkr new_tyvars new_context new_details locn,
+ cxt_fvs `plusFV` det_fvs)
+ where
+ doc = text "the definition of data constructor" <+> quotes (ppr name)
+
+rnConDetails doc locn (VanillaCon tys)
+ = mapFvRn (rnBangTy doc) tys `thenRn` \ (new_tys, fvs) ->
+ returnRn (VanillaCon new_tys, fvs)
+
+rnConDetails doc locn (InfixCon ty1 ty2)
+ = rnBangTy doc ty1 `thenRn` \ (new_ty1, fvs1) ->
+ rnBangTy doc ty2 `thenRn` \ (new_ty2, fvs2) ->
+ returnRn (InfixCon new_ty1 new_ty2, fvs1 `plusFV` fvs2)
-rnFixes fixities
- = mapRn rn_fixity fixities `thenRn` \ fixes_maybe ->
- returnRn (catMaybes fixes_maybe)
+rnConDetails doc locn (NewCon ty mb_field)
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
+ rn_field mb_field `thenRn` \ new_mb_field ->
+ returnRn (NewCon new_ty new_mb_field, fvs)
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)
-
+ rn_field Nothing = returnRn Nothing
+ rn_field (Just f) =
+ lookupBndrRn f `thenRn` \ new_f ->
+ returnRn (Just new_f)
+
+rnConDetails doc locn (RecCon fields)
+ = checkDupOrQualNames doc field_names `thenRn_`
+ mapFvRn (rnField doc) fields `thenRn` \ (new_fields, fvs) ->
+ returnRn (RecCon new_fields, fvs)
+ where
+ field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds]
+
+rnField doc (names, ty)
+ = mapRn lookupBndrRn names `thenRn` \ new_names ->
+ rnBangTy doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn ((new_names, new_ty), fvs)
+
+rnBangTy doc (Banged ty)
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn (Banged new_ty, fvs)
+
+rnBangTy doc (Unbanged ty)
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn (Unbanged new_ty, fvs)
+
+rnBangTy doc (Unpacked ty)
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn (Unpacked new_ty, fvs)
+
+-- 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{Support code to rename types}
%*********************************************************
\begin{code}
-rnPolyType :: TyVarNamesEnv
- -> RdrNamePolyType
- -> RnM_Fixes s RenamedPolyType
+rnHsSigType :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
+ -- rnHsSigType is used for source-language type signatures,
+ -- which use *implicit* universal quantification.
+rnHsSigType doc_str ty
+ = rnHsType (text "the type signature for" <+> doc_str) ty
+
+---------------------------------------
+rnHsType :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
+
+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 . (`elemFM` name_env)) mentioned
+ in
+ rnForAll doc (map UserTyVar forall_tyvars) ctxt ty
-rnPolyType tv_env (HsForAllTy tvs ctxt ty)
- = rn_poly_help tv_env tvs ctxt ty
+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 = map getTyVarName forall_tyvars
-rnPolyType tv_env poly_ty@(HsPreForAllTy ctxt ty)
- = rn_poly_help tv_env forall_tyvars ctxt ty
+ -- 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', unitFV tyvar')
+
+rnHsType doc (HsFunTy ty1 ty2)
+ = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
+ -- Might find a for-all as the arg of a function type
+ rnHsType doc ty2 `thenRn` \ (ty2', fvs2) ->
+ -- 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', fvs1 `plusFV` fvs2)
+
+rnHsType doc (HsListTy ty)
+ = rnHsType doc ty `thenRn` \ (ty', fvs) ->
+ returnRn (HsListTy ty', fvs `addOneFV` listTyCon_name)
+
+-- 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) tys)
+ -- Don't do lookupOccRn, because this is built-in syntax
+ -- so it doesn't need to be in scope
+ = mapFvRn (rnHsType doc) tys `thenRn` \ (tys', fvs) ->
+ returnRn (HsTupleTy (HsTupCon n' boxity) tys', fvs `addOneFV` n')
+ where
+ n' = tupleTyCon_name boxity (length tys)
+
+
+rnHsType doc (HsAppTy ty1 ty2)
+ = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
+ rnHsType doc ty2 `thenRn` \ (ty2', fvs2) ->
+ returnRn (HsAppTy ty1' ty2', fvs1 `plusFV` fvs2)
+
+rnHsType doc (HsPredTy pred)
+ = rnPred doc pred `thenRn` \ (pred', fvs) ->
+ returnRn (HsPredTy pred', fvs)
+
+rnHsType doc (HsUsgForAllTy uv_rdr ty)
+ = bindUVarRn doc uv_rdr $ \ uv_name ->
+ rnHsType doc ty `thenRn` \ (ty', fvs) ->
+ returnRn (HsUsgForAllTy uv_name ty',
+ fvs )
+
+rnHsType doc (HsUsgTy usg ty)
+ = newUsg usg `thenRn` \ (usg', usg_fvs) ->
+ rnHsType doc ty `thenRn` \ (ty', ty_fvs) ->
+ -- A for-all can occur inside a usage annotation
+ returnRn (HsUsgTy usg' ty',
+ usg_fvs `plusFV` ty_fvs)
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) ->
+ newUsg usg = case usg of
+ HsUsOnce -> returnRn (HsUsOnce, emptyFVs)
+ HsUsMany -> returnRn (HsUsMany, emptyFVs)
+ HsUsVar uv_rdr -> lookupOccRn uv_rdr `thenRn` \ uv_name ->
+ returnRn (HsUsVar uv_name, emptyFVs)
+
+rnHsTypes doc tys = mapFvRn (rnHsType doc) tys
+\end{code}
+
+\begin{code}
+-- We use lookupOcc here because this is interface file only stuff
+-- and we need the workers...
+rnHsTupCon (HsTupCon n boxity)
+ = lookupOccRn n `thenRn` \ n' ->
+ returnRn (HsTupCon n' boxity, unitFV n')
+
+rnHsTupConWkr (HsTupCon n boxity)
+ -- Tuple construtors are for the *worker* of the tuple
+ -- Going direct saves needless messing about
+ = lookupOccRn (mkRdrNameWkr n) `thenRn` \ n' ->
+ returnRn (HsTupCon n' boxity, unitFV n')
+\end{code}
+
+\begin{code}
+-- Check that each constraint mentions at least one of the forall'd type variables
+-- Since the forall'd type variables are a subset of the free tyvars
+-- of the tau-type part, this guarantees that every constraint mentions
+-- at least one of the free tyvars in ty
+checkConstraints doc forall_tyvars tau_vars ctxt ty
+ = mapRn (checkPred doc forall_tyvars ty) ctxt `thenRn` \ maybe_ctxt' ->
+ returnRn (catMaybes maybe_ctxt')
+ -- Remove problem ones, to avoid duplicate error message.
+
+checkPred doc forall_tyvars ty p@(HsPClass clas tys)
+ | not_univ = failWithRn Nothing (univErr doc p ty)
+ | otherwise = returnRn (Just p)
+ where
+ ct_vars = extractHsTysRdrTyVars tys
+ not_univ = -- At least one of the tyvars in each constraint must
+ -- be universally quantified. This restriction isn't in Hugs
+ not (any (`elem` forall_tyvars) ct_vars)
+checkPred doc forall_tyvars ty p@(HsPIParam _ _)
+ = returnRn (Just p)
+
+rnForAll doc forall_tyvars ctxt ty
+ = bindTyVarsFVRn doc forall_tyvars $ \ new_tyvars ->
+ rnContext doc ctxt `thenRn` \ (new_ctxt, cxt_fvs) ->
+ rnHsType doc ty `thenRn` \ (new_ty, ty_fvs) ->
+ returnRn (mkHsForAllTy (Just new_tyvars) new_ctxt new_ty,
+ cxt_fvs `plusFV` ty_fvs)
+\end{code}
+
+\begin{code}
+rnContext :: SDoc -> RdrNameContext -> RnMS (RenamedContext, FreeVars)
+rnContext doc ctxt
+ = mapAndUnzipRn rn_pred ctxt `thenRn` \ (theta, fvs_s) ->
let
- tv_env2 = catTyVarNamesEnvs tv_env1 tv_env
+ (_, dups) = removeDupsEq theta
+ -- We only have equality, not ordering
in
- rnContext tv_env2 ctxt `thenRn` \ new_ctxt ->
- rnMonoType tv_env2 ty `thenRn` \ new_ty ->
- returnRn (HsForAllTy new_tyvars new_ctxt new_ty)
+ -- Check for duplicate assertions
+ -- If this isn't an error, then it ought to be:
+ mapRn (addWarnRn . dupClassAssertWarn theta) dups `thenRn_`
+ returnRn (theta, plusFVs fvs_s)
+ 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', fvs)->
+ checkRn (not (bad_pred pred'))
+ (naughtyCCallContextErr pred') `thenRn_`
+ returnRn (pred', fvs)
+
+ bad_pred (HsPClass clas _) = getUnique clas `elem` cCallishClassKeys
+ bad_pred other = False
+
+
+rnPred doc (HsPClass clas tys)
+ = lookupOccRn clas `thenRn` \ clas_name ->
+ rnHsTypes doc tys `thenRn` \ (tys', fvs) ->
+ returnRn (HsPClass clas_name tys', fvs `addOneFV` clas_name)
+
+rnPred doc (HsPIParam n ty)
+ = getIPName n `thenRn` \ name ->
+ rnHsType doc ty `thenRn` \ (ty', fvs) ->
+ returnRn (HsPIParam name ty', fvs)
\end{code}
\begin{code}
-rnMonoType :: TyVarNamesEnv
- -> RdrNameMonoType
- -> RnM_Fixes s RenamedMonoType
+rnFds :: SDoc -> [FunDep RdrName] -> RnMS ([FunDep Name], FreeVars)
-rnMonoType tv_env (MonoTyVar tyvar)
- = lookupTyVarName tv_env tyvar `thenRn` \ tyvar' ->
- returnRn (MonoTyVar tyvar')
+rnFds doc fds
+ = mapAndUnzipRn rn_fds fds `thenRn` \ (theta, fvs_s) ->
+ returnRn (theta, plusFVs fvs_s)
+ where
+ rn_fds (tys1, tys2)
+ = rnHsTyVars doc tys1 `thenRn` \ (tys1', fvs1) ->
+ rnHsTyVars doc tys2 `thenRn` \ (tys2', fvs2) ->
+ returnRn ((tys1', tys2'), fvs1 `plusFV` fvs2)
+
+rnHsTyVars doc tvs = mapFvRn (rnHsTyvar doc) tvs
+rnHsTyvar doc tyvar
+ = lookupOccRn tyvar `thenRn` \ tyvar' ->
+ returnRn (tyvar', unitFV tyvar')
+\end{code}
-rnMonoType tv_env (MonoListTy ty)
- = rnMonoType tv_env ty `thenRn` \ ty' ->
- returnRn (MonoListTy ty')
+%*********************************************************
+%* *
+\subsection{IdInfo}
+%* *
+%*********************************************************
-rnMonoType tv_env (MonoFunTy ty1 ty2)
- = andRn MonoFunTy (rnMonoType tv_env ty1)
- (rnMonoType tv_env ty2)
+\begin{code}
+rnIdInfo (HsStrictness str) = returnRn (HsStrictness str, emptyFVs)
-rnMonoType tv_env (MonoTupleTy tys)
- = mapRn (rnMonoType tv_env) tys `thenRn` \ tys' ->
- returnRn (MonoTupleTy tys')
+rnIdInfo (HsWorker worker)
+ = lookupOccRn worker `thenRn` \ worker' ->
+ returnRn (HsWorker worker', unitFV worker')
+
+rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ (expr', fvs) ->
+ returnRn (HsUnfold inline expr', fvs)
+rnIdInfo (HsArity arity) = returnRn (HsArity arity, emptyFVs)
+rnIdInfo (HsUpdate update) = returnRn (HsUpdate update, emptyFVs)
+rnIdInfo HsNoCafRefs = returnRn (HsNoCafRefs, emptyFVs)
+rnIdInfo HsCprInfo = returnRn (HsCprInfo, emptyFVs)
-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}
+@UfCore@ expressions.
+
\begin{code}
-rnContext :: TyVarNamesEnv -> RdrNameContext -> RnM_Fixes s RenamedContext
+rnCoreExpr (UfType ty)
+ = rnHsType (text "unfolding type") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfType ty', fvs)
+
+rnCoreExpr (UfVar v)
+ = lookupOccRn v `thenRn` \ v' ->
+ returnRn (UfVar v', unitFV v')
+
+rnCoreExpr (UfLit l)
+ = returnRn (UfLit l, emptyFVs)
+
+rnCoreExpr (UfLitLit l ty)
+ = rnHsType (text "litlit") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfLitLit l ty', fvs)
+
+rnCoreExpr (UfCCall cc ty)
+ = rnHsType (text "ccall") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfCCall cc ty', fvs)
+
+rnCoreExpr (UfTuple con args)
+ = rnHsTupConWkr con `thenRn` \ (con', fvs1) ->
+ mapFvRn rnCoreExpr args `thenRn` \ (args', fvs2) ->
+ returnRn (UfTuple con' args', fvs1 `plusFV` fvs2)
+
+rnCoreExpr (UfApp fun arg)
+ = rnCoreExpr fun `thenRn` \ (fun', fv1) ->
+ rnCoreExpr arg `thenRn` \ (arg', fv2) ->
+ returnRn (UfApp fun' arg', fv1 `plusFV` fv2)
+
+rnCoreExpr (UfCase scrut bndr alts)
+ = rnCoreExpr scrut `thenRn` \ (scrut', fvs1) ->
+ bindCoreLocalFVRn bndr ( \ bndr' ->
+ mapFvRn rnCoreAlt alts `thenRn` \ (alts', fvs2) ->
+ returnRn (UfCase scrut' bndr' alts', fvs2)
+ ) `thenRn` \ (case', fvs3) ->
+ returnRn (case', fvs1 `plusFV` fvs3)
+
+rnCoreExpr (UfNote note expr)
+ = rnNote note `thenRn` \ (note', fvs1) ->
+ rnCoreExpr expr `thenRn` \ (expr', fvs2) ->
+ returnRn (UfNote note' expr', fvs1 `plusFV` fvs2)
+
+rnCoreExpr (UfLam bndr body)
+ = rnCoreBndr bndr $ \ bndr' ->
+ rnCoreExpr body `thenRn` \ (body', fvs) ->
+ returnRn (UfLam bndr' body', fvs)
+
+rnCoreExpr (UfLet (UfNonRec bndr rhs) body)
+ = rnCoreExpr rhs `thenRn` \ (rhs', fvs1) ->
+ rnCoreBndr bndr ( \ bndr' ->
+ rnCoreExpr body `thenRn` \ (body', fvs2) ->
+ returnRn (UfLet (UfNonRec bndr' rhs') body', fvs2)
+ ) `thenRn` \ (result, fvs3) ->
+ returnRn (result, fvs1 `plusFV` fvs3)
+
+rnCoreExpr (UfLet (UfRec pairs) body)
+ = rnCoreBndrs bndrs $ \ bndrs' ->
+ mapFvRn rnCoreExpr rhss `thenRn` \ (rhss', fvs1) ->
+ rnCoreExpr body `thenRn` \ (body', fvs2) ->
+ returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body', fvs1 `plusFV` fvs2)
+ where
+ (bndrs, rhss) = unzip pairs
+\end{code}
-rnContext tv_env ctxt
- = mapRn rn_ctxt ctxt
+\begin{code}
+rnCoreBndr (UfValBinder name ty) thing_inside
+ = rnHsType doc ty `thenRn` \ (ty', fvs1) ->
+ bindCoreLocalFVRn name ( \ name' ->
+ thing_inside (UfValBinder name' ty')
+ ) `thenRn` \ (result, fvs2) ->
+ returnRn (result, fvs1 `plusFV` fvs2)
where
- rn_ctxt (clas, tyvar)
- = lookupClass clas `thenRn` \ clas_name ->
- lookupTyVarName tv_env tyvar `thenRn` \ tyvar_name ->
- returnRn (clas_name, tyvar_name)
+ doc = text "unfolding id"
+
+rnCoreBndr (UfTyBinder name kind) thing_inside
+ = bindCoreLocalFVRn 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}
+
+\begin{code}
+rnCoreAlt (con, bndrs, rhs)
+ = rnUfCon con bndrs `thenRn` \ (con', fvs1) ->
+ bindCoreLocalsFVRn bndrs ( \ bndrs' ->
+ rnCoreExpr rhs `thenRn` \ (rhs', fvs2) ->
+ returnRn ((con', bndrs', rhs'), fvs2)
+ ) `thenRn` \ (result, fvs3) ->
+ returnRn (result, fvs1 `plusFV` fvs3)
+
+rnNote (UfCoerce ty)
+ = rnHsType (text "unfolding coerce") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfCoerce ty', fvs)
+
+rnNote (UfSCC cc) = returnRn (UfSCC cc, emptyFVs)
+rnNote UfInlineCall = returnRn (UfInlineCall, emptyFVs)
+rnNote UfInlineMe = returnRn (UfInlineMe, emptyFVs)
+
+
+rnUfCon UfDefault _
+ = returnRn (UfDefault, emptyFVs)
+
+rnUfCon (UfTupleAlt tup_con) bndrs
+ = rnHsTupCon tup_con `thenRn` \ (HsTupCon con' _, fvs) ->
+ returnRn (UfDataAlt con', fvs)
+ -- Makes the type checker a little easier
+
+rnUfCon (UfDataAlt con) _
+ = lookupOccRn con `thenRn` \ con' ->
+ returnRn (UfDataAlt con', unitFV con')
+
+rnUfCon (UfLitAlt lit) _
+ = returnRn (UfLitAlt lit, emptyFVs)
+
+rnUfCon (UfLitLitAlt lit ty) _
+ = rnHsType (text "litlit") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfLitLitAlt lit ty', fvs)
\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 (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")]
+
+classTyVarNotInOpTyErr clas_tyvar sig
+ = hang (hsep [ptext SLIT("Class type variable"),
+ quotes (ppr clas_tyvar),
+ ptext SLIT("does not appear in method signature")])
+ 4 (ppr sig)
+
+badDataCon name
+ = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)]
+
+forAllWarn doc ty tyvar
+ | not opt_WarnUnusedMatches = returnRn ()
+ | otherwise
+ = 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))]
+ $$
+ (ptext SLIT("In") <+> doc))
+ }
+
+forAllErr doc ty tyvar
+ = addErrRn (
+ sep [ptext SLIT("The constrained type variable") <+> quotes (ppr tyvar),
+ nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))]
+ $$
+ (ptext SLIT("In") <+> doc))
+
+univErr doc constraint ty
+ = sep [ptext SLIT("All of the type variable(s) in the constraint")
+ <+> quotes (ppr constraint)
+ <+> ptext SLIT("are already in scope"),
+ nest 4 (ptext SLIT("At least one must be universally quantified here"))
+ ]
+ $$
+ (ptext SLIT("In") <+> doc)
+
+badRuleLhsErr name lhs
+ = sep [ptext SLIT("Rule") <+> ptext name <> colon,
+ nest 4 (ptext SLIT("Illegal left-hand side:") <+> ppr lhs)]
+ $$
+ ptext SLIT("LHS must be of form (f e1 .. en) where f is not forall'd")
+
+badRuleVar name var
+ = sep [ptext SLIT("Rule") <+> ptext name <> colon,
+ ptext SLIT("Forall'd variable") <+> quotes (ppr var) <+>
+ ptext SLIT("does not appear on left hand side")]
+
+badExtName :: ExtName -> Message
+badExtName ext_nm
+ = sep [quotes (ppr ext_nm) <+> ptext SLIT("is not a valid C identifier")]
+
+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 (HsPClass clas _)
+ = sep [ptext SLIT("Can't use class") <+> quotes (ppr clas),
+ ptext SLIT("in a context")]
\end{code}
projects / ghc-hetmet.git / blobdiff