\section[RnSource]{Main pass of renamer}
\begin{code}
-module RnSource ( rnDecl, rnHsSigType ) where
+module RnSource ( rnIfaceDecl, rnSourceDecls, rnHsType, rnHsSigType ) where
#include "HsVersions.h"
import HsDecls ( HsIdInfo(..), HsStrictnessInfo(..) )
import HsPragmas
import HsTypes ( getTyVarName, pprClassAssertion, cmpHsTypes )
-import RdrHsSyn
+import RdrName ( RdrName, isRdrDataCon, rdrNameOcc )
+import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl,
+ extractHsTyVars
+ )
import RnHsSyn
import HsCore
-import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs )
+import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, unknownSigErr )
import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn,
lookupImplicitOccRn, addImplicitOccRn,
- bindLocalsRn,
- newDfunName, checkDupOrQualNames, checkDupNames,
+ bindLocalsRn,
+ bindTyVarsFVRn, bindTyVarsFV2Rn, extendTyVarEnvFVRn,
+ checkDupOrQualNames, checkDupNames,
newLocallyDefinedGlobalName, newImportedGlobalName,
- ifaceFlavour, listTyCon_name, tupleTyCon_name )
+ newImportedGlobalFromRdrName,
+ newDFunName,
+ FreeVars, emptyFVs, plusFV, plusFVs, unitFV, addOneFV
+ )
import RnMonad
-import Name ( Name, OccName(..), occNameString, prefixOccName,
- ExportFlag(..), Provenance(..),
- nameOccName, NamedThing(..), isLexCon,
- mkDefaultMethodName
+import Name ( Name, OccName,
+ ExportFlag(..), Provenance(..),
+ nameOccName, NamedThing(..),
+ mkDefaultMethodOcc, mkDFunOcc
)
import NameSet
import BasicTypes ( TopLevelFlag(..) )
+import TysWiredIn ( tupleTyCon, unboxedTupleTyCon, listTyCon )
+import Type ( funTyCon )
import FiniteMap ( elemFM )
import PrelInfo ( derivingOccurrences, numClass_RDR,
deRefStablePtr_NAME, makeStablePtr_NAME,
bindIO_NAME
)
import Bag ( bagToList )
+import List ( partition )
import Outputable
import SrcLoc ( SrcLoc )
+import CmdLineOpts ( opt_WarnUnusedMatches ) -- Warn of unused for-all'd tyvars
import UniqFM ( lookupUFM )
-import Maybes ( maybeToBool )
+import Maybes ( maybeToBool, catMaybes )
import Util
\end{code}
%*********************************************************
\begin{code}
-rnDecl :: RdrNameHsDecl -> RnMS s RenamedHsDecl
+rnSourceDecls :: [RdrNameHsDecl] -> RnMS s ([RenamedHsDecl], FreeVars)
+ -- The decls get reversed, but that's ok
+
+rnSourceDecls decls
+ = go emptyFVs [] decls
+ where
+ -- Fixity decls 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' (d:ds) = rnDecl d `thenRn` \(d', fvs') ->
+ go (fvs `plusFV` fvs') (d':ds') ds
+
+rnIfaceDecl :: RdrNameHsDecl -> RnMS s RenamedHsDecl
+rnIfaceDecl d
+ = rnDecl d `thenRn` \ (d', fvs) ->
+ returnRn d'
+\end{code}
+
+
+%*********************************************************
+%* *
+\subsection{Value declarations}
+%* *
+%*********************************************************
+
+\begin{code}
+-- rnDecl does all the work
+rnDecl :: RdrNameHsDecl -> RnMS s (RenamedHsDecl, FreeVars)
-rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ new_binds ->
- returnRn (ValD new_binds)
+rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) ->
+ returnRn (ValD new_binds, fvs)
rnDecl (SigD (IfaceSig name ty id_infos loc))
= pushSrcLocRn loc $
lookupBndrRn name `thenRn` \ name' ->
- rnHsType doc_str ty `thenRn` \ ty' ->
+ rnIfaceType doc_str ty `thenRn` \ ty' ->
-- Get the pragma info (if any).
- getModeRn `thenRn` \ (InterfaceMode _ print_unqual) ->
- setModeRn (InterfaceMode Optional print_unqual) $
+ setModeRn (InterfaceMode Optional) $
-- In all the rest of the signature we read in optional mode,
-- so that (a) we don't die
mapRn rnIdInfo id_infos `thenRn` \ id_infos' ->
- returnRn (SigD (IfaceSig name' ty' id_infos' loc))
+ returnRn (SigD (IfaceSig name' ty' id_infos' loc), emptyFVs)
+ -- Don't need free-var info for iface binds
where
doc_str = text "the interface signature for" <+> quotes (ppr name)
\end{code}
checks at the same time.
\begin{code}
-rnDecl (TyD (TyData new_or_data context tycon tyvars condecls derivings pragmas src_loc))
+rnDecl (TyClD (TyData new_or_data context tycon tyvars condecls derivings pragmas src_loc))
= pushSrcLocRn src_loc $
lookupBndrRn tycon `thenRn` \ tycon' ->
- bindTyVarsRn data_doc tyvars $ \ tyvars' ->
- rnContext data_doc context `thenRn` \ context' ->
+ bindTyVarsFVRn data_doc tyvars $ \ tyvars' ->
+ rnContext data_doc context `thenRn` \ (context', cxt_fvs) ->
checkDupOrQualNames data_doc con_names `thenRn_`
- mapRn rnConDecl condecls `thenRn` \ condecls' ->
- rnDerivs derivings `thenRn` \ derivings' ->
+ mapAndUnzipRn rnConDecl condecls `thenRn` \ (condecls', con_fvs_s) ->
+ rnDerivs derivings `thenRn` \ (derivings', deriv_fvs) ->
ASSERT(isNoDataPragmas pragmas)
- returnRn (TyD (TyData new_or_data context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc))
+ returnRn (TyClD (TyData new_or_data context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc),
+ cxt_fvs `plusFV` plusFVs con_fvs_s `plusFV` deriv_fvs)
where
- data_doc = text "the data type declaration for" <+> ppr tycon
+ data_doc = text "the data type declaration for" <+> quotes (ppr tycon)
con_names = map conDeclName condecls
-rnDecl (TyD (TySynonym name tyvars ty src_loc))
+rnDecl (TyClD (TySynonym name tyvars ty src_loc))
= pushSrcLocRn src_loc $
lookupBndrRn name `thenRn` \ name' ->
- bindTyVarsRn syn_doc tyvars $ \ tyvars' ->
- rnHsType syn_doc ty `thenRn` \ ty' ->
- returnRn (TyD (TySynonym name' tyvars' ty' src_loc))
+ bindTyVarsFVRn syn_doc tyvars $ \ tyvars' ->
+ rnHsType syn_doc 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)
-\end{code}
-
-%*********************************************************
-%* *
-\subsection{Class 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}
-rnDecl (ClD (ClassDecl context cname tyvars sigs mbinds pragmas tname dname src_loc))
+rnDecl (TyClD (ClassDecl context cname tyvars sigs mbinds pragmas tname dname src_loc))
= pushSrcLocRn src_loc $
lookupBndrRn cname `thenRn` \ cname' ->
- lookupBndrRn tname `thenRn` \ tname' ->
- lookupBndrRn dname `thenRn` \ dname' ->
- bindTyVarsRn cls_doc tyvars ( \ tyvars' ->
- rnContext cls_doc context `thenRn` \ context' ->
+ -- 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
+ newImportedGlobalFromRdrName tname `thenRn` \ tname' ->
+ newImportedGlobalFromRdrName dname `thenRn` \ dname' ->
- -- Check the signatures
- let
- clas_tyvar_names = map getTyVarName tyvars'
- in
- checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_`
- mapRn (rn_op cname' clas_tyvar_names) sigs `thenRn` \ sigs' ->
- returnRn (tyvars', context', sigs')
- ) `thenRn` \ (tyvars', context', sigs') ->
+ -- Tyvars scope over bindings and context
+ bindTyVarsFV2Rn cls_doc tyvars ( \ clas_tyvar_names tyvars' ->
+
+ -- Check the superclasses
+ rnContext cls_doc context `thenRn` \ (context', cxt_fvs) ->
+
+ -- Check the signatures
+ let
+ -- First process the class op sigs, then the fixity sigs.
+ (op_sigs, non_op_sigs) = partition isClassOpSig sigs
+ (fix_sigs, non_sigs) = partition isFixitySig non_op_sigs
+ in
+ checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_`
+ mapAndUnzipRn (rn_op cname' clas_tyvar_names) op_sigs `thenRn` \ (sigs', sig_fvs_s) ->
+ mapRn_ (unknownSigErr) non_sigs `thenRn_`
+ let
+ binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ]
+ in
+ renameSigs False binders lookupOccRn fix_sigs `thenRn` \ (fixs', fix_fvs) ->
-- Check the methods
checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_`
- rnMethodBinds mbinds `thenRn` \ mbinds' ->
+ rnMethodBinds mbinds `thenRn` \ (mbinds', meth_fvs) ->
-- Typechecker is responsible for checking that we only
-- give default-method bindings for things in this class.
-- for instance decls.
ASSERT(isNoClassPragmas pragmas)
- returnRn (ClD (ClassDecl context' cname' tyvars' sigs' mbinds' NoClassPragmas tname' dname' src_loc))
+ returnRn (TyClD (ClassDecl context' cname' tyvars' (fixs' ++ sigs') mbinds' NoClassPragmas tname' dname' src_loc),
+ plusFVs sig_fvs_s `plusFV`
+ fix_fvs `plusFV`
+ cxt_fvs `plusFV`
+ meth_fvs
+ )
+ )
where
cls_doc = text "the declaration for class" <+> ppr cname
sig_doc = text "the signatures for class" <+> ppr cname
rn_op clas clas_tyvars sig@(ClassOpSig op maybe_dm ty locn)
= pushSrcLocRn locn $
lookupBndrRn op `thenRn` \ op_name ->
- rnHsSigType (quotes (ppr op)) ty `thenRn` \ new_ty ->
+
+ -- 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` op_ty_fvs)
+ (classTyVarNotInOpTyErr clas_tyvar sig)
+ in
+ mapRn_ check_in_op_ty clas_tyvars `thenRn_`
-- Make the default-method name
let
- dm_occ = mkDefaultMethodName (rdrNameOcc op)
+ dm_occ = mkDefaultMethodOcc (rdrNameOcc op)
in
getModuleRn `thenRn` \ mod_name ->
getModeRn `thenRn` \ mode ->
(\_ -> Exported) locn `thenRn` \ dm_name ->
returnRn (Just dm_name)
- (InterfaceMode _ _, Just _)
+ (InterfaceMode _, Just _)
-> -- Imported class that has a default method decl
- newImportedGlobalName mod_name dm_occ (ifaceFlavour clas) `thenRn` \ dm_name ->
- addOccurrenceName dm_name `thenRn_`
+ newImportedGlobalName mod_name dm_occ `thenRn` \ dm_name ->
+ addOccurrenceName dm_name `thenRn_`
returnRn (Just dm_name)
other -> returnRn Nothing
) `thenRn` \ maybe_dm_name ->
- -- Check that each class tyvar appears in op_ty
- let
- (ctxt, op_ty) = case new_ty of
- HsForAllTy tvs ctxt op_ty -> (ctxt, op_ty)
- other -> ([], new_ty)
- ctxt_fvs = extractHsCtxtTyNames ctxt -- Includes tycons/classes but we
- op_ty_fvs = extractHsTyNames op_ty -- don't care about that
-
- check_in_op_ty clas_tyvar = checkRn (clas_tyvar `elemNameSet` op_ty_fvs)
- (classTyVarNotInOpTyErr clas_tyvar sig)
- in
- mapRn check_in_op_ty clas_tyvars `thenRn_`
- returnRn (ClassOpSig op_name maybe_dm_name new_ty locn)
+ returnRn (ClassOpSig op_name maybe_dm_name new_ty locn, op_ty_fvs)
\end{code}
\begin{code}
rnDecl (InstD (InstDecl inst_ty mbinds uprags maybe_dfun src_loc))
= pushSrcLocRn src_loc $
- rnHsSigType (text "an instance decl") inst_ty `thenRn` \ inst_ty' ->
-
+ rnHsSigType (text "an instance decl") inst_ty `thenRn` \ (inst_ty', inst_fvs) ->
+ let
+ 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
+ extendTyVarEnvFVRn inst_tyvars $
-- Rename the bindings
-- NB meth_names can be qualified!
checkDupNames meth_doc meth_names `thenRn_`
- rnMethodBinds mbinds `thenRn` \ mbinds' ->
+ rnMethodBinds mbinds `thenRn` \ (mbinds', meth_fvs) ->
let
binders = mkNameSet (map fst (bagToList (collectMonoBinders mbinds')))
+
+ -- Delete sigs (&report) sigs that aren't allowed inside an
+ -- instance decl:
+ --
+ -- + type signatures
+ -- + fixity decls
+ --
+ (ok_sigs, not_ok_idecl_sigs) = partition okInInstDecl uprags
+
+ okInInstDecl (FixSig _) = False
+ okInInstDecl (Sig _ _ _) = False
+ okInInstDecl _ = True
+
in
- renameSigs NotTopLevel True binders uprags `thenRn` \ new_uprags ->
-
- let
- -- We use the class name and the name of the first
- -- type constructor the class is applied to.
- (cl_nm, tycon_nm) = mkDictPrefix inst_ty'
-
- mkDictPrefix (MonoDictTy cl tys) =
- case tys of
- [] -> (c_nm, nilOccName )
- (ty:_) -> (c_nm, getInstHeadTy ty)
- where
- c_nm = nameOccName (getName cl)
-
- mkDictPrefix (HsForAllTy _ _ ty) = mkDictPrefix ty -- can this
- mkDictPrefix _ = (nilOccName, nilOccName)
-
- getInstHeadTy t
- = case t of
- MonoTyVar tv -> nameOccName (getName tv)
- MonoTyApp t _ -> getInstHeadTy t
- _ -> nilOccName
- -- I cannot see how the rest of HsType constructors
- -- can occur, but this isn't really a failure condition,
- -- so we return silently.
-
- nilOccName = (VarOcc _NIL_) -- ToDo: add OccName constructor fun for this.
- in
- newDfunName cl_nm tycon_nm maybe_dfun src_loc `thenRn` \ dfun_name ->
- addOccurrenceName dfun_name `thenRn_`
+ -- You can't have fixity decls & type signatures
+ -- within an instance declaration.
+ mapRn_ unknownSigErr not_ok_idecl_sigs `thenRn_`
+ renameSigs False binders lookupOccRn ok_sigs `thenRn` \ (new_uprags, prag_fvs) ->
+ mkDFunName inst_ty' maybe_dfun src_loc `thenRn` \ dfun_name ->
+ addOccurrenceName dfun_name `thenRn_`
-- The dfun is not optional, because we use its version number
-- to identify the version of the instance declaration
-- The typechecker checks that all the bindings are for the right class.
- returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags (Just dfun_name) src_loc))
+ returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags (Just dfun_name) src_loc),
+ inst_fvs `plusFV` meth_fvs `plusFV` prag_fvs)
where
meth_doc = text "the bindings in an instance declaration"
meth_names = bagToList (collectMonoBinders mbinds)
\begin{code}
rnDecl (DefD (DefaultDecl tys src_loc))
= pushSrcLocRn src_loc $
- mapRn (rnHsType doc_str) tys `thenRn` \ tys' ->
+ rnHsTypes doc_str tys `thenRn` \ (tys', fvs) ->
lookupImplicitOccRn numClass_RDR `thenRn_`
- returnRn (DefD (DefaultDecl tys' src_loc))
+ returnRn (DefD (DefaultDecl tys' src_loc), fvs)
where
doc_str = text "a `default' declaration"
\end{code}
addImplicitOccRn deRefStablePtr_NAME `thenRn_`
addImplicitOccRn bindIO_NAME `thenRn_`
returnRn name'
- _ -> returnRn name') `thenRn_`
- rnHsSigType fo_decl_msg ty `thenRn` \ ty' ->
- returnRn (ForD (ForeignDecl name' imp_exp ty' ext_nm cconv src_loc))
+ _ -> returnRn name') `thenRn_`
+ rnHsSigType fo_decl_msg ty `thenRn` \ (ty', fvs) ->
+ returnRn (ForD (ForeignDecl name' imp_exp ty' ext_nm cconv src_loc), fvs)
where
fo_decl_msg = ptext SLIT("a foreign declaration")
isDyn = isDynamic ext_nm
%*********************************************************
\begin{code}
-rnDerivs :: Maybe [RdrName] -> RnMS s (Maybe [Name])
+rnDerivs :: Maybe [RdrName] -> RnMS s (Maybe [Name], FreeVars)
rnDerivs Nothing -- derivs not specified
- = returnRn Nothing
+ = returnRn (Nothing, emptyFVs)
rnDerivs (Just ds)
= mapRn rn_deriv ds `thenRn` \ derivs ->
- returnRn (Just derivs)
+ returnRn (Just derivs, foldl addOneFV emptyFVs derivs)
where
rn_deriv clas
= lookupOccRn clas `thenRn` \ clas_name ->
Nothing -> addErrRn (derivingNonStdClassErr clas_name) `thenRn_`
returnRn clas_name
- Just occs -> mapRn lookupImplicitOccRn occs `thenRn_`
+ Just occs -> mapRn_ lookupImplicitOccRn occs `thenRn_`
returnRn clas_name
+
\end{code}
\begin{code}
conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc)
conDeclName (ConDecl n _ _ _ l) = (n,l)
-rnConDecl :: RdrNameConDecl -> RnMS s RenamedConDecl
+rnConDecl :: RdrNameConDecl -> RnMS s (RenamedConDecl, FreeVars)
rnConDecl (ConDecl name tvs cxt details locn)
= pushSrcLocRn locn $
checkConName name `thenRn_`
lookupBndrRn name `thenRn` \ new_name ->
- bindTyVarsRn doc tvs $ \ new_tyvars ->
- rnContext doc cxt `thenRn` \ new_context ->
- rnConDetails doc locn details `thenRn` \ new_details ->
- returnRn (ConDecl new_name new_tyvars new_context new_details locn)
+ 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_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)
- = mapRn (rnBangTy doc) tys `thenRn` \ new_tys ->
- returnRn (VanillaCon new_tys)
+ = mapAndUnzipRn (rnBangTy doc) tys `thenRn` \ (new_tys, fvs_s) ->
+ returnRn (VanillaCon new_tys, plusFVs fvs_s)
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 (NewCon ty)
- = rnHsType doc ty `thenRn` \ new_ty ->
- returnRn (NewCon new_ty)
+ = rnBangTy doc ty1 `thenRn` \ (new_ty1, fvs1) ->
+ rnBangTy doc ty2 `thenRn` \ (new_ty2, fvs2) ->
+ returnRn (InfixCon new_ty1 new_ty2, fvs1 `plusFV` fvs2)
+
+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_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_`
- mapRn (rnField doc) fields `thenRn` \ new_fields ->
- returnRn (RecCon new_fields)
+ mapAndUnzipRn (rnField doc) fields `thenRn` \ (new_fields, fvs_s) ->
+ returnRn (RecCon new_fields, plusFVs fvs_s)
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 ->
- returnRn (new_names, new_ty)
+ rnBangTy doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn ((new_names, new_ty), fvs)
rnBangTy doc (Banged ty)
- = rnHsType doc ty `thenRn` \ new_ty ->
- returnRn (Banged new_ty)
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn (Banged new_ty, fvs)
rnBangTy doc (Unbanged ty)
- = rnHsType doc ty `thenRn` \ new_ty ->
- returnRn (Unbanged new_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
-- from interface files, which always print in prefix form
checkConName name
- = checkRn (isLexCon (occNameString (rdrNameOcc name)))
+ = checkRn (isRdrDataCon name)
(badDataCon name)
\end{code}
%*********************************************************
%* *
-\subsection{Support code to rename types}
+\subsection{Naming a dfun}
%* *
%*********************************************************
-\begin{code}
-rnHsSigType :: SDoc -> RdrNameHsType -> RnMS s RenamedHsType
- -- 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
+Make a name for the dict fun for an instance decl
+\begin{code}
+mkDFunName :: RenamedHsType -- Instance type
+ -> Maybe RdrName -- Dfun thing from decl; Nothing <=> source
+ -> SrcLoc
+ -> RnMS s Name
+mkDFunName inst_ty maybe_df src_loc
+ = newDFunName cl_occ tycon_occ maybe_df src_loc
+ where
+ (cl_occ, tycon_occ) = get_key inst_ty
+
+ get_key (HsForAllTy _ _ ty) = get_key ty
+ get_key (MonoFunTy _ ty) = get_key ty
+ get_key (MonoDictTy cls (ty:_)) = (nameOccName cls, get_tycon_key ty)
+
+ get_tycon_key (MonoTyVar tv) = nameOccName (getName tv)
+ get_tycon_key (MonoTyApp ty _) = get_tycon_key ty
+ get_tycon_key (MonoTupleTy tys True) = getOccName (tupleTyCon (length tys))
+ get_tycon_key (MonoTupleTy tys False) = getOccName (unboxedTupleTyCon (length tys))
+ get_tycon_key (MonoListTy _) = getOccName listTyCon
+ get_tycon_key (MonoFunTy _ _) = getOccName funTyCon
+\end{code}
-rnHsType :: SDoc -> RdrNameHsType -> RnMS s RenamedHsType
+%*********************************************************
+%* *
+\subsection{Support code to rename types}
+%* *
+%*********************************************************
-rnHsType doc (HsForAllTy [] ctxt ty)
+\begin{code}
+rnHsSigType :: SDoc -> RdrNameHsType -> RnMS s (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
+
+rnIfaceType :: SDoc -> RdrNameHsType -> RnMS s RenamedHsType
+rnIfaceType doc ty
+ = rnHsType doc ty `thenRn` \ (ty,_) ->
+ returnRn ty
+
+
+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 new_tyvars new_ctxt new_ty,
+ cxt_fvs `plusFV` ty_fvs)
+
+-- 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 explicit_forall doc forall_tyvars ctxt ty
+ = mapRn check ctxt `thenRn` \ maybe_ctxt' ->
+ returnRn (catMaybes maybe_ctxt')
+ -- Remove problem ones, to avoid duplicate error message.
+ where
+ check ct@(_,tys)
+ | forall_mentioned = returnRn (Just ct)
+ | otherwise = addErrRn (ctxtErr explicit_forall doc forall_tyvars ct ty) `thenRn_`
+ returnRn Nothing
+ where
+ forall_mentioned = foldr ((||) . any (`elem` forall_tyvars) . extractHsTyVars)
+ False
+ tys
+
+
+rnHsType :: SDoc -> RdrNameHsType -> RnMS s (RenamedHsType, FreeVars)
+
+rnHsType doc (HsForAllTy Nothing ctxt ty)
-- From source code (no kinds on tyvars)
-
-- Given the signature C => T we universally quantify
-- over FV(T) \ {in-scope-tyvars}
- --
- -- We insist that the universally quantified type vars is a superset of FV(C)
- -- It follows that FV(T) is a superset of FV(C), so that the context constrains
- -- no type variables that don't appear free in the tau-type part.
-
= getLocalNameEnv `thenRn` \ name_env ->
let
mentioned_tyvars = extractHsTyVars ty
forall_tyvars = filter (not . (`elemFM` name_env)) mentioned_tyvars
-
- ctxt_w_ftvs :: [((RdrName,[RdrNameHsType]), [RdrName])]
- ctxt_w_ftvs = [ (constraint, foldr ((++) . extractHsTyVars) [] tys)
- | constraint@(_,tys) <- ctxt]
-
- -- A 'non-poly constraint' is one that does not mention *any*
- -- of the forall'd type variables
- non_poly_constraints = filter non_poly ctxt_w_ftvs
- non_poly (c,ftvs) = not (any (`elem` forall_tyvars) ftvs)
-
- -- A 'non-mentioned' constraint is one that mentions a
- -- type variable that does not appear in 'ty'
- non_mentioned_constraints = filter non_mentioned ctxt_w_ftvs
- non_mentioned (c,ftvs) = any (not . (`elem` mentioned_tyvars)) ftvs
-
- -- Zap the context if there's a problem, to avoid duplicate error message.
- ctxt' | null non_poly_constraints && null non_mentioned_constraints = ctxt
- | otherwise = []
in
- mapRn (ctxtErr1 doc forall_tyvars ty) non_poly_constraints `thenRn_`
- mapRn (ctxtErr2 doc ty) non_mentioned_constraints `thenRn_`
-
- (bindTyVarsRn doc (map UserTyVar forall_tyvars) $ \ new_tyvars ->
- rnContext doc ctxt' `thenRn` \ new_ctxt ->
- rnHsType doc ty `thenRn` \ new_ty ->
- returnRn (mkHsForAllTy new_tyvars new_ctxt new_ty))
-
-rnHsType doc (HsForAllTy tvs ctxt ty)
- -- tvs are non-empty, hence must be from an interface file
- -- (tyvars may be kinded)
- = bindTyVarsRn doc tvs $ \ new_tyvars ->
- rnContext doc ctxt `thenRn` \ new_ctxt ->
- rnHsType doc ty `thenRn` \ new_ty ->
- returnRn (mkHsForAllTy new_tyvars new_ctxt new_ty)
-
+ checkConstraints False doc forall_tyvars ctxt ty `thenRn` \ ctxt' ->
+ rnForAll doc (map UserTyVar forall_tyvars) ctxt' ty
+
+rnHsType doc (HsForAllTy (Just forall_tyvars) ctxt ty)
+ -- Explicit quantification.
+ -- Check that the forall'd tyvars are a subset of the
+ -- free tyvars in the tau-type part
+ -- That's only a warning... unless the tyvar is constrained by a
+ -- context in which case it's an error
+ = let
+ mentioned_tyvars = extractHsTyVars ty
+ constrained_tyvars = [tv | (_,tys) <- ctxt,
+ ty <- tys,
+ tv <- extractHsTyVars ty]
+ dubious_guys = filter (`notElem` mentioned_tyvars) forall_tyvar_names
+ (bad_guys, warn_guys) = partition (`elem` constrained_tyvars) dubious_guys
+ forall_tyvar_names = map getTyVarName forall_tyvars
+ in
+ mapRn_ (forAllErr doc ty) bad_guys `thenRn_`
+ mapRn_ (forAllWarn doc ty) warn_guys `thenRn_`
+ checkConstraints True doc forall_tyvar_names ctxt ty `thenRn` \ ctxt' ->
+ rnForAll doc forall_tyvars ctxt' ty
rnHsType doc (MonoTyVar tyvar)
= lookupOccRn tyvar `thenRn` \ tyvar' ->
- returnRn (MonoTyVar tyvar')
+ returnRn (MonoTyVar tyvar', unitFV tyvar')
rnHsType doc (MonoFunTy ty1 ty2)
- = andRn MonoFunTy (rnHsType doc ty1) (rnHsType doc ty2)
+ = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
+ rnHsType doc ty2 `thenRn` \ (ty2', fvs2) ->
+ returnRn (MonoFunTy ty1' ty2', fvs1 `plusFV` fvs2)
rnHsType doc (MonoListTy ty)
= addImplicitOccRn listTyCon_name `thenRn_`
- rnHsType doc ty `thenRn` \ ty' ->
- returnRn (MonoListTy ty')
+ rnHsType doc ty `thenRn` \ (ty', fvs) ->
+ returnRn (MonoListTy ty', fvs `addOneFV` listTyCon_name)
rnHsType doc (MonoTupleTy tys boxed)
- = addImplicitOccRn (tupleTyCon_name boxed (length tys)) `thenRn_`
- mapRn (rnHsType doc) tys `thenRn` \ tys' ->
- returnRn (MonoTupleTy tys' boxed)
+ = addImplicitOccRn tup_con_name `thenRn_`
+ rnHsTypes doc tys `thenRn` \ (tys', fvs) ->
+ returnRn (MonoTupleTy tys' boxed, fvs `addOneFV` tup_con_name)
+ where
+ tup_con_name = tupleTyCon_name boxed (length tys)
rnHsType doc (MonoTyApp ty1 ty2)
- = rnHsType doc ty1 `thenRn` \ ty1' ->
- rnHsType doc ty2 `thenRn` \ ty2' ->
- returnRn (MonoTyApp ty1' ty2')
+ = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
+ rnHsType doc ty2 `thenRn` \ (ty2', fvs2) ->
+ returnRn (MonoTyApp ty1' ty2', fvs1 `plusFV` fvs2)
rnHsType doc (MonoDictTy clas tys)
= lookupOccRn clas `thenRn` \ clas' ->
- mapRn (rnHsType doc) tys `thenRn` \ tys' ->
- returnRn (MonoDictTy clas' tys')
+ rnHsTypes doc tys `thenRn` \ (tys', fvs) ->
+ returnRn (MonoDictTy clas' tys', fvs `addOneFV` clas')
+
+rnHsTypes doc tys
+ = mapAndUnzipRn (rnHsType doc) tys `thenRn` \ (tys, fvs_s) ->
+ returnRn (tys, plusFVs fvs_s)
\end{code}
\begin{code}
-rnContext :: SDoc -> RdrNameContext -> RnMS s RenamedContext
+rnContext :: SDoc -> RdrNameContext -> RnMS s (RenamedContext, FreeVars)
rnContext doc ctxt
- = mapRn rn_ctxt ctxt `thenRn` \ theta ->
+ = mapAndUnzipRn rn_ctxt ctxt `thenRn` \ (theta, fvs_s) ->
let
(_, dup_asserts) = removeDups cmp_assert theta
in
-- Check for duplicate assertions
-- If this isn't an error, then it ought to be:
- mapRn (addWarnRn . dupClassAssertWarn theta) dup_asserts `thenRn_`
+ mapRn_ (addWarnRn . dupClassAssertWarn theta) dup_asserts `thenRn_`
- returnRn theta
+ returnRn (theta, plusFVs fvs_s)
where
rn_ctxt (clas, tys)
- = lookupBndrRn clas `thenRn` \ clas_name ->
- addOccurrenceName clas_name `thenRn_`
- mapRn (rnHsType doc) tys `thenRn` \ tys' ->
- returnRn (clas_name, tys')
+ = lookupOccRn clas `thenRn` \ clas_name ->
+ rnHsTypes doc tys `thenRn` \ (tys', fvs) ->
+ returnRn ((clas_name, tys'), fvs `addOneFV` clas_name)
cmp_assert (c1,tys1) (c2,tys2)
= (c1 `compare` c2) `thenCmp` (cmpHsTypes compare tys1 tys2)
%*********************************************************
\begin{code}
-rnIdInfo (HsStrictness strict)
- = rnStrict strict `thenRn` \ strict' ->
- returnRn (HsStrictness strict')
+rnIdInfo (HsStrictness str) = returnRn (HsStrictness str)
+
+rnIdInfo (HsWorker worker cons)
+ -- The sole purpose of the "cons" field is so that we can mark the
+ -- constructors needed to build the wrapper as "needed", so that their
+ -- data type decl will be slurped in. After that their usefulness is
+ -- o'er, so we just put in the empty list.
+ = lookupOccRn worker `thenRn` \ worker' ->
+ mapRn lookupOccRn cons `thenRn_`
+ returnRn (HsWorker worker' [])
rnIdInfo (HsUnfold inline (Just expr)) = rnCoreExpr expr `thenRn` \ expr' ->
returnRn (HsUnfold inline (Just expr'))
rnIdInfo (HsArity arity) = returnRn (HsArity arity)
rnIdInfo (HsUpdate update) = returnRn (HsUpdate update)
rnIdInfo (HsNoCafRefs) = returnRn (HsNoCafRefs)
+rnIdInfo (HsCprInfo cpr_info) = returnRn (HsCprInfo cpr_info)
rnIdInfo (HsSpecialise tyvars tys expr)
= bindTyVarsRn doc tyvars $ \ tyvars' ->
rnCoreExpr expr `thenRn` \ expr' ->
- mapRn (rnHsType doc) tys `thenRn` \ tys' ->
+ mapRn (rnIfaceType doc) tys `thenRn` \ tys' ->
returnRn (HsSpecialise tyvars' tys' expr')
where
doc = text "Specialise in interface pragma"
-
-
-rnStrict (HsStrictnessInfo demands (Just (worker,cons)))
- -- The sole purpose of the "cons" field is so that we can mark the constructors
- -- needed to build the wrapper as "needed", so that their data type decl will be
- -- slurped in. After that their usefulness is o'er, so we just put in the empty list.
- = lookupOccRn worker `thenRn` \ worker' ->
- mapRn lookupOccRn cons `thenRn_`
- returnRn (HsStrictnessInfo demands (Just (worker',[])))
-
--- Boring, but necessary for the type checker.
-rnStrict (HsStrictnessInfo demands Nothing) = returnRn (HsStrictnessInfo demands Nothing)
-rnStrict HsBottom = returnRn HsBottom
\end{code}
UfCore expressions.
\begin{code}
rnCoreExpr (UfType ty)
- = rnHsType (text "unfolding type") ty `thenRn` \ ty' ->
+ = rnIfaceType (text "unfolding type") ty `thenRn` \ ty' ->
returnRn (UfType ty')
rnCoreExpr (UfVar v)
rnCoreExpr (UfCase scrut bndr alts)
= rnCoreExpr scrut `thenRn` \ scrut' ->
- bindLocalsRn "UfCase" [bndr] $ \ [bndr'] ->
+ bindLocalsRn "a UfCase" [bndr] $ \ [bndr'] ->
mapRn rnCoreAlt alts `thenRn` \ alts' ->
returnRn (UfCase scrut' bndr' alts')
\begin{code}
rnCoreBndr (UfValBinder name ty) thing_inside
- = rnHsType (text str) ty `thenRn` \ ty' ->
+ = rnIfaceType (text str) ty `thenRn` \ ty' ->
bindLocalsRn str [name] $ \ [name'] ->
thing_inside (UfValBinder name' ty')
where
str = "unfolding id"
rnCoreBndr (UfTyBinder name kind) thing_inside
- = bindLocalsRn "unfolding tyvar" [name] $ \ [name'] ->
+ = bindLocalsRn "an unfolding tyvar" [name] $ \ [name'] ->
thing_inside (UfTyBinder name' kind)
rnCoreBndrs bndrs thing_inside -- Expect them all to be ValBinders
- = mapRn (rnHsType (text str)) tys `thenRn` \ tys' ->
+ = mapRn (rnIfaceType (text str)) tys `thenRn` \ tys' ->
bindLocalsRn str names $ \ names' ->
thing_inside (zipWith UfValBinder names' tys')
where
\begin{code}
rnCoreAlt (con, bndrs, rhs)
- = rnUfCon con `thenRn` \ con' ->
- bindLocalsRn "unfolding alt" bndrs $ \ bndrs' ->
- rnCoreExpr rhs `thenRn` \ rhs' ->
+ = rnUfCon con `thenRn` \ con' ->
+ bindLocalsRn "an unfolding alt" bndrs $ \ bndrs' ->
+ rnCoreExpr rhs `thenRn` \ rhs' ->
returnRn (con', bndrs', rhs')
rnNote (UfCoerce ty)
- = rnHsType (text "unfolding coerce") ty `thenRn` \ ty' ->
+ = rnIfaceType (text "unfolding coerce") ty `thenRn` \ ty' ->
returnRn (UfCoerce ty')
rnNote (UfSCC cc) = returnRn (UfSCC cc)
= returnRn (UfLitCon lit)
rnUfCon (UfLitLitCon lit ty)
- = rnHsType (text "litlit") ty `thenRn` \ ty' ->
+ = rnIfaceType (text "litlit") ty `thenRn` \ ty' ->
returnRn (UfLitLitCon lit ty')
rnUfCon (UfPrimOp op)
= lookupOccRn op `thenRn` \ op' ->
returnRn (UfPrimOp op')
-rnUfCon (UfCCallOp str casm gc)
- = returnRn (UfCCallOp str casm gc)
+rnUfCon (UfCCallOp str is_dyn casm gc)
+ = returnRn (UfCCallOp str is_dyn casm gc)
\end{code}
%*********************************************************
= sep [hsep [ptext SLIT("Duplicate class assertion"),
quotes (pprClassAssertion assertion),
ptext SLIT("in the context:")],
- nest 4 (pprContext ctxt)]
+ nest 4 (pprContext ctxt <+> ptext SLIT("..."))]
badDataCon name
= hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)]
-ctxtErr1 doc tyvars ty (constraint, _)
- = addErrRn (
- sep [ptext SLIT("The constraint") <+> quotes (pprClassAssertion constraint) <+>
- ptext SLIT("does not mention any of"),
- nest 4 (ptext SLIT("the universally quantified type variables") <+> braces (interpp'SP tyvars)),
- nest 4 (ptext SLIT("of the type") <+> quotes (ppr ty))
- ]
+forAllWarn doc ty tyvar
+ | not opt_WarnUnusedMatches = returnRn ()
+ | otherwise
+ = 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))]
$$
- (ptext SLIT("In") <+> doc)
- )
+ (ptext SLIT("In") <+> doc))
-ctxtErr2 doc ty (constraint,_)
+forAllErr doc ty tyvar
= addErrRn (
- sep [ptext SLIT("The constraint") <+> quotes (pprClassAssertion constraint),
- nest 4 (ptext SLIT("mentions type variables that do not appear in the type")),
- nest 4 (quotes (ppr ty))]
- $$
- (ptext SLIT("In") <+> doc)
- )
+ sep [ptext SLIT("The constrained type variable") <+> quotes (ppr tyvar),
+ nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))]
+ $$
+ (ptext SLIT("In") <+> doc))
+
+ctxtErr explicit_forall doc tyvars constraint ty
+ = sep [ptext SLIT("The constraint") <+> quotes (pprClassAssertion constraint) <+>
+ ptext SLIT("does not mention any of"),
+ if explicit_forall then
+ nest 4 (ptext SLIT("the universally quantified type variables") <+> braces (interpp'SP tyvars))
+ else
+ nest 4 (ptext SLIT("the type variables in the type") <+> quotes (ppr ty))
+ ]
+ $$
+ (ptext SLIT("In") <+> doc)
\end{code}