%
-% (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}
-module RnSource ( rnDecl, rnHsType, rnHsSigType ) where
+module RnSource ( rnDecl, rnTyClDecl, rnIfaceRuleDecl, rnInstDecl, rnSourceDecls,
+ rnHsType, rnHsSigType, rnHsTypeFVs, rnHsSigTypeFVs
+ ) where
#include "HsVersions.h"
import RnExpr
import HsSyn
-import HsDecls ( HsIdInfo(..), HsStrictnessInfo(..) )
-import HsPragmas
-import HsTypes ( getTyVarName, pprClassAssertion, cmpHsTypes )
-import RdrHsSyn
+import HscTypes ( GlobalRdrEnv )
+import HsTypes ( hsTyVarNames, pprHsContext )
+import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, mkRdrNameWkr, elemRdrEnv )
+import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl, RdrNameTyClDecl,
+ extractRuleBndrsTyVars, extractHsTyRdrTyVars,
+ extractHsCtxtRdrTyVars, extractGenericPatTyVars
+ )
import RnHsSyn
import HsCore
-import CmdLineOpts ( opt_IgnoreIfacePragmas )
-import RnBinds ( rnTopBinds, rnMethodBinds )
-import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn, lookupImplicitOccRn, bindLocalsRn,
- newDfunName, checkDupOrQualNames, checkDupNames,
- newLocallyDefinedGlobalName, newImportedGlobalName, ifaceFlavour,
- listType_RDR, tupleType_RDR )
+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 Name ( Name, OccName(..), occNameString, prefixOccName,
- ExportFlag(..), Provenance(..), NameSet,
- elemNameSet
+import Class ( FunDep, DefMeth (..) )
+import Name ( Name, OccName, nameOccName, NamedThing(..) )
+import NameSet
+import PrelInfo ( derivableClassKeys, cCallishClassKeys )
+import PrelNames ( deRefStablePtr_RDR, newStablePtr_RDR,
+ bindIO_RDR, returnIO_RDR
)
-import FiniteMap ( lookupFM )
-import Id ( GenId{-instance NamedThing-} )
-import IdInfo ( FBTypeInfo, ArgUsageInfo )
-import Lex ( isLexCon )
-import PrelInfo ( derivingOccurrences, evalClass_RDR, numClass_RDR, allClass_NAME )
-import Maybes ( maybeToBool )
-import Bag ( bagToList )
+import List ( partition, nub )
import Outputable
import SrcLoc ( SrcLoc )
-import Unique ( Unique )
-import UniqSet ( UniqSet )
-import UniqFM ( UniqFM, lookupUFM )
-import Util
-import List ( partition, nub )
+import CmdLineOpts ( DynFlag(..) )
+ -- Warn of unused for-all'd tyvars
+import Unique ( Uniquable(..) )
+import ErrUtils ( Message )
+import CStrings ( isCLabelString )
+import ListSetOps ( removeDupsEq )
\end{code}
-rnDecl `renames' declarations.
+@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}
-rnDecl :: RdrNameHsDecl -> RnMS s RenamedHsDecl
-
-rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ new_binds ->
- returnRn (ValD new_binds)
-
+rnSourceDecls :: GlobalRdrEnv -> LocalFixityEnv
+ -> [RdrNameHsDecl]
+ -> RnMG ([RenamedHsDecl], FreeVars)
+ -- The decls get reversed, but that's ok
-rnDecl (SigD (IfaceSig name ty id_infos loc))
- = pushSrcLocRn loc $
- lookupBndrRn name `thenRn` \ name' ->
- rnHsType ty `thenRn` \ ty' ->
-
- -- Get the pragma info (if any).
- getModeRn `thenRn` \ (InterfaceMode _ print_unqual) ->
- setModeRn (InterfaceMode Optional print_unqual) $
- -- 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))
+rnSourceDecls gbl_env local_fixity_env decls
+ = initRnMS gbl_env 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) = rnDecl d `thenRn` \(d', fvs') ->
+ go (fvs `plusFV` fvs') (d':ds') ds
\end{code}
+
%*********************************************************
%* *
-\subsection{Type declarations}
+\subsection{Value declarations}
%* *
%*********************************************************
-@rnTyDecl@ uses the `global name function' to create a new type
-declaration in which local names have been replaced by their original
-names, reporting any unknown names.
-
-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.
-
\begin{code}
-rnDecl (TyD (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 context `thenRn` \ context' ->
- checkDupOrQualNames data_doc con_names `thenRn_`
- mapRn rnConDecl condecls `thenRn` \ condecls' ->
- rnDerivs derivings `thenRn` \ derivings' ->
- ASSERT(isNoDataPragmas pragmas)
- returnRn (TyD (TyData new_or_data context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc))
- where
- data_doc = text "the data type declaration for" <+> ppr tycon
- con_names = map conDeclName condecls
+-- rnDecl does all the work
+rnDecl :: RdrNameHsDecl -> RnMS (RenamedHsDecl, FreeVars)
+
+rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) ->
+ returnRn (ValD new_binds, fvs)
+
+rnDecl (TyClD tycl_decl)
+ = rnTyClDecl tycl_decl `thenRn` \ new_decl ->
+ rnClassBinds tycl_decl new_decl `thenRn` \ (new_decl', fvs) ->
+ returnRn (TyClD new_decl', fvs `plusFV` tyClDeclFVs new_decl')
+
+rnDecl (InstD inst)
+ = rnInstDecl inst `thenRn` \ new_inst ->
+ rnInstBinds inst new_inst `thenRn` \ (new_inst', fvs) ->
+ returnRn (InstD new_inst', fvs `plusFV` instDeclFVs new_inst')
+
+rnDecl (RuleD rule)
+ | isIfaceRuleDecl rule
+ = rnIfaceRuleDecl rule `thenRn` \ new_rule ->
+ returnRn (RuleD new_rule, ruleDeclFVs new_rule)
+ | otherwise
+ = rnHsRuleDecl rule `thenRn` \ (new_rule, fvs) ->
+ returnRn (RuleD new_rule, fvs)
-rnDecl (TyD (TySynonym name tyvars ty src_loc))
+rnDecl (DefD (DefaultDecl tys src_loc))
= pushSrcLocRn src_loc $
- lookupBndrRn name `thenRn` \ name' ->
- bindTyVarsRn syn_doc tyvars $ \ tyvars' ->
- rnHsType ty `thenRn` \ ty' ->
- returnRn (TyD (TySynonym name' tyvars' ty' src_loc))
+ mapFvRn (rnHsTypeFVs doc_str) tys `thenRn` \ (tys', fvs) ->
+ returnRn (DefD (DefaultDecl tys' src_loc), fvs)
where
- syn_doc = text "the declaration for type synonym" <+> ppr name
-\end{code}
+ doc_str = text "a `default' declaration"
-%*********************************************************
-%* *
-\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 (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc))
= pushSrcLocRn src_loc $
+ lookupOccRn name `thenRn` \ name' ->
+ let
+ extra_fvs FoExport
+ | isDyn = lookupOrigNames [newStablePtr_RDR, deRefStablePtr_RDR,
+ bindIO_RDR, returnIO_RDR]
+ | otherwise =
+ lookupOrigNames [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_`
- lookupBndrRn cname `thenRn` \ cname' ->
- lookupBndrRn tname `thenRn` \ tname' ->
- lookupBndrRn dname `thenRn` \ dname' ->
-
- bindTyVarsRn cls_doc tyvars ( \ tyvars' ->
- rnContext context `thenRn` \ context' ->
-
- -- 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') ->
-
- -- Check the methods
- checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_`
- rnMethodBinds mbinds `thenRn` \ mbinds' ->
+ extra_fvs imp_exp `thenRn` \ fvs1 ->
- -- 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.
+ rnHsTypeFVs 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("The foreign declaration for") <+> ppr name
+ isDyn = isDynamicExtName ext_nm
- ASSERT(isNoClassPragmas pragmas)
- returnRn (ClD (ClassDecl context' cname' tyvars' sigs' mbinds' NoClassPragmas tname' dname' src_loc))
- where
- 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 sig@(ClassOpSig op maybe_dm ty locn)
- = pushSrcLocRn locn $
- lookupBndrRn op `thenRn` \ op_name ->
- rnHsSigType (quotes (ppr op)) ty `thenRn` \ new_ty ->
-
- -- Make the default-method name
- let
- dm_occ = prefixOccName SLIT("$m") (rdrNameOcc op)
- in
- getModuleRn `thenRn` \ mod_name ->
- getModeRn `thenRn` \ mode ->
- (case (mode, maybe_dm) of
- (SourceMode, _) | op `elem` meth_rdr_names
- -> -- There's an explicit method decl
- newLocallyDefinedGlobalName mod_name dm_occ
- (\_ -> Exported) locn `thenRn` \ dm_name ->
- returnRn (Just dm_name)
-
- (InterfaceMode _ _, Just _)
- -> -- Imported class that has a default method decl
- newImportedGlobalName mod_name dm_occ (ifaceFlavour clas) `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)
+ 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}
%*********************************************************
\begin{code}
-rnDecl (InstD (InstDecl inst_ty mbinds uprags maybe_dfun src_loc))
+rnInstDecl (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc)
= 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 rnClassBinds
+rnInstBinds (InstDecl _ mbinds uprags _ _ )
+ (InstDecl inst_ty _ _ maybe_dfun_rdr_name src_loc)
+ = let
+ meth_doc = text "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
-- Rename the bindings
-- NB meth_names can be qualified!
checkDupNames meth_doc meth_names `thenRn_`
- rnMethodBinds mbinds `thenRn` \ mbinds' ->
- mapRn rn_uprag uprags `thenRn` \ new_uprags ->
+ 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_rdr_name src_loc,
+ meth_fvs `plusFV` prag_fvs)
+\end{code}
- newDfunName 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
+%*********************************************************
+%* *
+\subsection{Rules}
+%* *
+%*********************************************************
- -- 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))
+\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
- meth_doc = text "the bindings in an instance declaration"
- meth_names = bagToList (collectMonoBinders mbinds)
-
- rn_uprag (SpecSig op ty using locn)
- = pushSrcLocRn src_loc $
- lookupBndrRn op `thenRn` \ op_name ->
- rnHsSigType (quotes (ppr op)) ty `thenRn` \ new_ty ->
- rn_using using `thenRn` \ new_using ->
- returnRn (SpecSig op_name new_ty new_using locn)
-
- rn_uprag (InlineSig op locn)
- = pushSrcLocRn locn $
- lookupBndrRn op `thenRn` \ op_name ->
- returnRn (InlineSig op_name locn)
-
- rn_uprag (MagicUnfoldingSig op str locn)
- = pushSrcLocRn locn $
- lookupBndrRn op `thenRn` \ op_name ->
- returnRn (MagicUnfoldingSig op_name str locn)
-
- rn_using Nothing = returnRn Nothing
- rn_using (Just v) = lookupOccRn v `thenRn` \ new_v ->
- returnRn (Just new_v)
+ 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) = rnHsTypeFVs doc t `thenRn` \ (t', fvs) ->
+ returnRn (RuleBndrSig id t', fvs)
\end{code}
+
%*********************************************************
%* *
-\subsection{Default declarations}
+\subsection{Type, class and iface sig declarations}
%* *
%*********************************************************
+@rnTyDecl@ uses the `global name function' to create a new type
+declaration in which local names have been replaced by their original
+names, reporting any unknown names.
+
+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.
+
\begin{code}
-rnDecl (DefD (DefaultDecl tys src_loc))
+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 "the interface signature for" <+> quotes (ppr name)
+
+rnTyClDecl (TyData {tcdND = new_or_data, tcdCtxt = context, tcdName = tycon,
+ tcdTyVars = tyvars, tcdCons = condecls, tcdNCons = nconstrs,
+ tcdDerivs = derivings, tcdLoc = src_loc, tcdSysNames = sys_names})
+ = pushSrcLocRn src_loc $
+ lookupTopBndrRn tycon `thenRn` \ tycon' ->
+ bindTyVarsRn data_doc tyvars $ \ tyvars' ->
+ rnContext data_doc context `thenRn` \ context' ->
+ checkDupOrQualNames data_doc con_names `thenRn_`
+ mapRn rnConDecl condecls `thenRn` \ condecls' ->
+ mapRn lookupSysBinder sys_names `thenRn` \ sys_names' ->
+ rnDerivs derivings `thenRn` \ derivings' ->
+ returnRn (TyData {tcdND = new_or_data, tcdCtxt = context', tcdName = tycon',
+ tcdTyVars = tyvars', tcdCons = condecls', tcdNCons = nconstrs,
+ tcdDerivs = derivings', tcdLoc = src_loc, tcdSysNames = sys_names'})
+ where
+ data_doc = text "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 $
+ 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 "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 glaExys ty = ty
+
+rnTyClDecl (ClassDecl {tcdCtxt = context, tcdName = cname,
+ tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs,
+ tcdSysNames = names, tcdLoc = src_loc})
= pushSrcLocRn src_loc $
- mapRn rnHsType tys `thenRn` \ tys' ->
- lookupImplicitOccRn numClass_RDR `thenRn_`
- returnRn (DefD (DefaultDecl tys' src_loc))
+
+ lookupTopBndrRn cname `thenRn` \ cname' ->
+
+ -- 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' ->
+
+ -- Tyvars scope over bindings and context
+ bindTyVars2Rn cls_doc tyvars $ \ clas_tyvar_names tyvars' ->
+
+ -- Check the superclasses
+ rnContext cls_doc context `thenRn` \ context' ->
+
+ -- Check the functional dependencies
+ rnFds cls_doc fds `thenRn` \ fds' ->
+
+ -- 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' ->
+
+ -- 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.
+
+ 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 "the declaration for class" <+> ppr cname
+ sig_doc = text "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)
+
+rnClassBinds :: RdrNameTyClDecl -> RenamedTyClDecl -> RnMS (RenamedTyClDecl, FreeVars)
+rnClassBinds (ClassDecl {tcdMeths = Nothing})
+ rn_cls_decl@(ClassDecl {tcdSigs = sigs})
+ -- No method bindings, so this class decl comes from an interface file,
+ -- However we want to treat the default-method names as free (they should
+ -- be defined somewhere else). [In source code this is not so; the class
+ -- decl will bind whatever default-methods are necessary.]
+ = returnRn (rn_cls_decl, mkFVs [v | ClassOpSig _ (DefMeth v) _ _ <- sigs])
+
+rnClassBinds (ClassDecl {tcdMeths = Just mbinds}) -- Get mbinds from here
+ rn_cls_decl@(ClassDecl {tcdTyVars = tyvars, tcdLoc = src_loc}) -- 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
+ extendTyVarEnvFVRn (map hsTyVarName tyvars) $
+ getLocalNameEnv `thenRn` \ name_env ->
+ let
+ meth_rdr_names_w_locs = collectLocatedMonoBinders mbinds
+ gen_rdr_tyvars_w_locs = [(tv,src_loc) | tv <- extractGenericPatTyVars mbinds,
+ not (tv `elemRdrEnv` name_env)]
+ in
+ 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 "the default-methods for class" <+> ppr (tcdName rn_cls_decl)
+
+rnClassBinds _ tycl_decl = returnRn (tycl_decl, emptyFVs)
+ -- Not a class declaration
\end{code}
+
%*********************************************************
%* *
\subsection{Support code for type/data declarations}
%*********************************************************
\begin{code}
-rnDerivs :: Maybe [RdrName] -> RnMS s (Maybe [Name])
+rnDerivs :: Maybe [RdrName] -> RnMS (Maybe [Name])
rnDerivs Nothing -- derivs not specified
- = lookupImplicitOccRn evalClass_RDR `thenRn_`
- returnRn Nothing
+ = returnRn Nothing
-rnDerivs (Just ds)
- = lookupImplicitOccRn evalClass_RDR `thenRn_`
- mapRn rn_deriv ds `thenRn` \ derivs ->
- returnRn (Just derivs)
+rnDerivs (Just clss)
+ = mapRn do_one clss `thenRn` \ clss' ->
+ returnRn (Just clss')
where
- rn_deriv clas
- = lookupOccRn clas `thenRn` \ clas_name ->
-
- -- Now add extra "occurrences" for things that
- -- the deriving mechanism will later need in order to
- -- generate code for this class.
- case lookupUFM derivingOccurrences clas_name of
- Nothing -> addErrRn (derivingNonStdClassErr clas_name) `thenRn_`
- returnRn clas_name
-
- Just occs -> mapRn lookupImplicitOccRn occs `thenRn_`
- returnRn clas_name
+ 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}
conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc)
-conDeclName (ConDecl n _ _ l) = (n,l)
+conDeclName (ConDecl n _ _ _ _ l) = (n,l)
-rnConDecl :: RdrNameConDecl -> RnMS s RenamedConDecl
-rnConDecl (ConDecl name cxt details locn)
+rnConDecl :: RdrNameConDecl -> RnMS RenamedConDecl
+rnConDecl (ConDecl name wkr tvs cxt details locn)
= pushSrcLocRn locn $
- checkConName name `thenRn_`
- lookupBndrRn name `thenRn` \ new_name ->
- rnConDetails name locn details `thenRn` \ new_details ->
- rnContext cxt `thenRn` \ new_context ->
- returnRn (ConDecl new_name new_context new_details locn)
-
-rnConDetails con locn (VanillaCon tys)
- = mapRn rnBangTy tys `thenRn` \ new_tys ->
+ 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 "the definition of data constructor" <+> quotes (ppr name)
+
+rnConDetails doc locn (VanillaCon tys)
+ = mapRn (rnBangTy doc) tys `thenRn` \ new_tys ->
returnRn (VanillaCon new_tys)
-rnConDetails con locn (InfixCon ty1 ty2)
- = rnBangTy ty1 `thenRn` \ new_ty1 ->
- rnBangTy ty2 `thenRn` \ new_ty2 ->
+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 con locn (NewCon ty)
- = rnHsType ty `thenRn` \ new_ty ->
- returnRn (NewCon new_ty)
-
-rnConDetails con locn (RecCon fields)
- = checkDupOrQualNames fld_doc field_names `thenRn_`
- mapRn rnField fields `thenRn` \ new_fields ->
+rnConDetails doc locn (RecCon fields)
+ = checkDupOrQualNames doc field_names `thenRn_`
+ mapRn (rnField doc) fields `thenRn` \ new_fields ->
returnRn (RecCon new_fields)
where
- fld_doc = text "the fields of constructor" <> ppr con
field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds]
-rnField (names, ty)
- = mapRn lookupBndrRn names `thenRn` \ new_names ->
- rnBangTy ty `thenRn` \ new_ty ->
+rnField doc (names, ty)
+ = mapRn lookupTopBndrRn names `thenRn` \ new_names ->
+ rnBangTy doc ty `thenRn` \ new_ty ->
returnRn (new_names, new_ty)
-rnBangTy (Banged ty)
- = rnHsType ty `thenRn` \ new_ty ->
+rnBangTy doc (Banged ty)
+ = rnHsType doc ty `thenRn` \ new_ty ->
returnRn (Banged new_ty)
-rnBangTy (Unbanged ty)
- = rnHsType ty `thenRn` \ new_ty ->
+rnBangTy doc (Unbanged ty)
+ = rnHsType doc ty `thenRn` \ new_ty ->
returnRn (Unbanged new_ty)
+rnBangTy doc (Unpacked ty)
+ = rnHsType doc ty `thenRn` \ new_ty ->
+ returnRn (Unpacked new_ty)
+
-- This data decl will parse OK
-- data T = a Int
-- treating "a" as the constructor.
-- from interface files, which always print in prefix form
checkConName name
- = checkRn (isLexCon (occNameString (rdrNameOcc name)))
+ = checkRn (isRdrDataCon name)
(badDataCon name)
\end{code}
%*********************************************************
\begin{code}
-rnHsSigType :: SDoc -> RdrNameHsType -> RnMS s RenamedHsType
+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 "the type signature for" <+> doc_str) ty
+
+---------------------------------------
+rnHsType :: SDoc -> RdrNameHsType -> RnMS RenamedHsType
--- 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.
-
-rnHsSigType doc_str full_ty@(HsPreForAllTy ctxt ty) -- From source code (no kinds on tyvars)
+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_tyvars = extractHsTyVars ty
- forall_tyvars = filter (not . in_scope) mentioned_tyvars
- in_scope tv = maybeToBool (lookupFM name_env tv)
-
- constrained_tyvars = extractHsCtxtTyVars ctxt
- constrained_and_in_scope = filter in_scope constrained_tyvars
- constrained_and_not_mentioned = filter (not . (`elem` mentioned_tyvars)) constrained_tyvars
-
- -- Zap the context if there's a problem, to avoid duplicate error message.
- ctxt' | null constrained_and_in_scope && null constrained_and_not_mentioned = ctxt
- | otherwise = []
+ 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
- checkRn (null constrained_and_in_scope)
- (ctxtErr1 sig_doc constrained_and_in_scope) `thenRn_`
- checkRn (null constrained_and_not_mentioned)
- (ctxtErr2 sig_doc constrained_and_not_mentioned ty) `thenRn_`
-
- (bindTyVarsRn sig_doc (map UserTyVar forall_tyvars) $ \ new_tyvars ->
- rnContext ctxt' `thenRn` \ new_ctxt ->
- rnHsType ty `thenRn` \ new_ty ->
- returnRn (HsForAllTy new_tyvars new_ctxt new_ty)
- )
- where
- sig_doc = text "the type signature for" <+> doc_str
-
-
-rnHsSigType doc_str other_ty = rnHsType other_ty
-
-rnHsType :: RdrNameHsType -> RnMS s RenamedHsType
-rnHsType (HsForAllTy tvs ctxt ty) -- From an interface file (tyvars may be kinded)
- = rn_poly_help tvs ctxt ty
-
-rnHsType full_ty@(HsPreForAllTy ctxt ty) -- A (context => ty) embedded in a type.
- -- Universally quantify over tyvars in context
- = getLocalNameEnv `thenRn` \ name_env ->
- let
- forall_tyvars = extractHsCtxtTyVars ctxt
+ rnForAll doc (map UserTyVar forall_tyvars) 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 = hsTyVarNames forall_tyvars
+
+ -- Explicitly quantified but not mentioned in ctxt or tau
+ warn_guys = filter (`notElem` mentioned) forall_tyvar_names
in
- rn_poly_help (map UserTyVar forall_tyvars) ctxt ty
+ mapRn_ (forAllWarn doc tau) warn_guys `thenRn_`
+ rnForAll doc forall_tyvars ctxt tau
-rnHsType (MonoTyVar tyvar)
+rnHsType doc (HsTyVar tyvar)
= lookupOccRn tyvar `thenRn` \ tyvar' ->
- returnRn (MonoTyVar tyvar')
-
-rnHsType (MonoFunTy ty1 ty2)
- = andRn MonoFunTy (rnHsType ty1) (rnHsType ty2)
-
-rnHsType (MonoListTy _ ty)
- = lookupImplicitOccRn listType_RDR `thenRn` \ tycon_name ->
- rnHsType ty `thenRn` \ ty' ->
- returnRn (MonoListTy tycon_name ty')
-
-rnHsType (MonoTupleTy _ tys)
- = lookupImplicitOccRn (tupleType_RDR (length tys)) `thenRn` \ tycon_name ->
- mapRn rnHsType tys `thenRn` \ tys' ->
- returnRn (MonoTupleTy tycon_name tys')
-
-rnHsType (MonoTyApp ty1 ty2)
- = rnHsType ty1 `thenRn` \ ty1' ->
- rnHsType ty2 `thenRn` \ ty2' ->
- returnRn (MonoTyApp ty1' ty2')
-
-rnHsType (MonoDictTy clas tys)
- = lookupOccRn clas `thenRn` \ clas' ->
- mapRn rnHsType tys `thenRn` \ tys' ->
- returnRn (MonoDictTy clas' tys')
-
-rn_poly_help :: [HsTyVar RdrName] -- Universally quantified tyvars
- -> RdrNameContext
- -> RdrNameHsType
- -> RnMS s RenamedHsType
-rn_poly_help tyvars ctxt ty
- = bindTyVarsRn sig_doc tyvars $ \ new_tyvars ->
- rnContext ctxt `thenRn` \ new_ctxt ->
- rnHsType ty `thenRn` \ new_ty ->
- returnRn (HsForAllTy new_tyvars new_ctxt new_ty)
+ 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) 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 n' boxity) tys')
where
- sig_doc = text "a nested for-all type"
+ n' = tupleTyCon_name boxity (length tys)
+
+
+rnHsType doc (HsAppTy ty1 ty2)
+ = rnHsType doc ty1 `thenRn` \ ty1' ->
+ rnHsType doc ty2 `thenRn` \ ty2' ->
+ returnRn (HsAppTy ty1' ty2')
+
+rnHsType doc (HsPredTy pred)
+ = rnPred doc pred `thenRn` \ pred' ->
+ returnRn (HsPredTy pred')
+
+rnHsTypes doc tys = mapRn (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)
+
+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)
+\end{code}
\begin{code}
-rnContext :: RdrNameContext -> RnMS s RenamedContext
+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}
-rnContext ctxt
- = mapRn rn_ctxt ctxt `thenRn` \ result ->
+\begin{code}
+rnContext :: SDoc -> RdrNameContext -> RnMS RenamedContext
+rnContext doc ctxt
+ = mapRn rn_pred ctxt `thenRn` \ theta ->
let
- (_, dup_asserts) = removeDups cmp_assert result
- (alls, theta) = partition (\(c,_) -> c == allClass_NAME) result
+ (_, dups) = removeDupsEq theta
+ -- We only have equality, not ordering
in
-
-- Check for duplicate assertions
-- If this isn't an error, then it ought to be:
- mapRn (addWarnRn . dupClassAssertWarn theta) dup_asserts `thenRn_`
-
- -- Check for All constraining a non-type-variable
- mapRn check_All alls `thenRn_`
-
- -- Done. Return a theta omitting all the "All" constraints.
- -- They have done done their work by ensuring that we universally
- -- quantify over their tyvar.
+ mapRn (addWarnRn . dupClassAssertWarn theta) dups `thenRn_`
returnRn theta
where
- rn_ctxt (clas, tys)
- = -- Mini hack here. If the class is our pseudo-class "All",
- -- then we don't want to record it as an occurrence, otherwise
- -- we try to slurp it in later and it doesn't really exist at all.
- -- Easiest thing is simply not to put it in the occurrence set.
- lookupBndrRn clas `thenRn` \ clas_name ->
- (if clas_name /= allClass_NAME then
- addOccurrenceName clas_name
- else
- returnRn clas_name
- ) `thenRn_`
- mapRn rnHsType tys `thenRn` \ tys' ->
- returnRn (clas_name, tys')
-
-
- cmp_assert (c1,tys1) (c2,tys2)
- = (c1 `compare` c2) `thenCmp` (cmpHsTypes compare tys1 tys2)
-
- check_All (c, [MonoTyVar _]) = returnRn () -- OK!
- check_All assertion = addErrRn (wierdAllErr assertion)
+ --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 (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' ->
+ returnRn (HsPClass clas_name tys')
+
+rnPred doc (HsPIParam n ty)
+ = newIPName n `thenRn` \ name ->
+ rnHsType doc ty `thenRn` \ ty' ->
+ returnRn (HsPIParam name ty')
\end{code}
+\begin{code}
+rnFds :: SDoc -> [FunDep RdrName] -> RnMS [FunDep Name]
+
+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{IdInfo}
-%* *
+%* *
%*********************************************************
\begin{code}
-rnIdInfo (HsStrictness strict)
- = rnStrict strict `thenRn` \ strict' ->
- returnRn (HsStrictness strict')
+rnIdInfo (HsWorker worker)
+ = lookupOccRn worker `thenRn` \ worker' ->
+ returnRn (HsWorker worker')
-rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ expr' ->
+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 (HsUpdate update) = returnRn (HsUpdate update)
-rnIdInfo (HsFBType fb) = returnRn (HsFBType fb)
-rnIdInfo (HsArgUsage au) = returnRn (HsArgUsage au)
-
-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
+rnIdInfo HsNoCafRefs = returnRn HsNoCafRefs
+rnIdInfo HsCprInfo = returnRn HsCprInfo
\end{code}
-UfCore expressions.
+@UfCore@ expressions.
\begin{code}
+rnCoreExpr (UfType ty)
+ = rnHsType (text "unfolding type") ty `thenRn` \ ty' ->
+ returnRn (UfType ty')
+
rnCoreExpr (UfVar v)
= lookupOccRn v `thenRn` \ v' ->
returnRn (UfVar v')
-rnCoreExpr (UfLit lit) = returnRn (UfLit lit)
+rnCoreExpr (UfLit l)
+ = returnRn (UfLit l)
-rnCoreExpr (UfCon con args)
- = lookupOccRn con `thenRn` \ con' ->
- mapRn rnCoreArg args `thenRn` \ args' ->
- returnRn (UfCon con' args')
+rnCoreExpr (UfLitLit l ty)
+ = rnHsType (text "litlit") ty `thenRn` \ ty' ->
+ returnRn (UfLitLit l ty')
-rnCoreExpr (UfPrim prim args)
- = rnCorePrim prim `thenRn` \ prim' ->
- mapRn rnCoreArg args `thenRn` \ args' ->
- returnRn (UfPrim prim' args')
+rnCoreExpr (UfCCall cc ty)
+ = rnHsType (text "ccall") ty `thenRn` \ ty' ->
+ returnRn (UfCCall cc ty')
+
+rnCoreExpr (UfTuple con args)
+ = rnHsTupConWkr con `thenRn` \ con' ->
+ mapRn rnCoreExpr args `thenRn` \ args' ->
+ returnRn (UfTuple con' args')
rnCoreExpr (UfApp fun arg)
= rnCoreExpr fun `thenRn` \ fun' ->
- rnCoreArg arg `thenRn` \ arg' ->
+ rnCoreExpr arg `thenRn` \ arg' ->
returnRn (UfApp fun' arg')
-rnCoreExpr (UfCase scrut alts)
- = rnCoreExpr scrut `thenRn` \ scrut' ->
- rnCoreAlts alts `thenRn` \ alts' ->
- returnRn (UfCase scrut' alts')
-
-rnCoreExpr (UfSCC cc expr)
- = rnCoreExpr expr `thenRn` \ expr' ->
- returnRn (UfSCC cc expr')
+rnCoreExpr (UfCase scrut bndr alts)
+ = rnCoreExpr scrut `thenRn` \ scrut' ->
+ bindCoreLocalRn bndr $ \ bndr' ->
+ mapRn rnCoreAlt alts `thenRn` \ alts' ->
+ returnRn (UfCase scrut' bndr' alts')
-rnCoreExpr(UfCoerce coercion ty body)
- = rnCoercion coercion `thenRn` \ coercion' ->
- rnHsType ty `thenRn` \ ty' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfCoerce coercion' ty' body')
+rnCoreExpr (UfNote note expr)
+ = rnNote note `thenRn` \ note' ->
+ rnCoreExpr expr `thenRn` \ expr' ->
+ returnRn (UfNote note' expr')
rnCoreExpr (UfLam bndr body)
= rnCoreBndr bndr $ \ bndr' ->
\begin{code}
rnCoreBndr (UfValBinder name ty) thing_inside
- = rnHsType ty `thenRn` \ ty' ->
- bindLocalsRn "unfolding value" [name] $ \ [name'] ->
+ = rnHsType doc ty `thenRn` \ ty' ->
+ bindCoreLocalRn name $ \ name' ->
thing_inside (UfValBinder name' ty')
+ where
+ doc = text "unfolding id"
rnCoreBndr (UfTyBinder name kind) thing_inside
- = bindLocalsRn "unfolding tyvar" [name] $ \ [name'] ->
+ = bindCoreLocalRn name $ \ name' ->
thing_inside (UfTyBinder name' kind)
-rnCoreBndrs bndrs thing_inside -- Expect them all to be ValBinders
- = mapRn rnHsType tys `thenRn` \ tys' ->
- bindLocalsRn "unfolding value" names $ \ names' ->
- thing_inside (zipWith UfValBinder names' tys')
- where
- names = map (\ (UfValBinder name _) -> name) bndrs
- tys = map (\ (UfValBinder _ ty) -> ty) bndrs
-
-rnCoreBndrNamess names thing_inside
- = bindLocalsRn "unfolding value" names $ \ names' ->
- thing_inside names'
+rnCoreBndrs [] thing_inside = thing_inside []
+rnCoreBndrs (b:bs) thing_inside = rnCoreBndr b $ \ name' ->
+ rnCoreBndrs bs $ \ names' ->
+ thing_inside (name':names')
\end{code}
\begin{code}
-rnCoreArg (UfVarArg v) = lookupOccRn v `thenRn` \ v' -> returnRn (UfVarArg v')
-rnCoreArg (UfTyArg ty) = rnHsType ty `thenRn` \ ty' -> returnRn (UfTyArg ty')
-rnCoreArg (UfLitArg lit) = returnRn (UfLitArg lit)
-
-rnCoreAlts (UfAlgAlts alts deflt)
- = mapRn rn_alt alts `thenRn` \ alts' ->
- rnCoreDefault deflt `thenRn` \ deflt' ->
- returnRn (UfAlgAlts alts' deflt')
- where
- rn_alt (con, bndrs, rhs) = lookupOccRn con `thenRn` \ con' ->
- bindLocalsRn "unfolding alt" bndrs $ \ bndrs' ->
- rnCoreExpr rhs `thenRn` \ rhs' ->
- returnRn (con', bndrs', rhs')
-
-rnCoreAlts (UfPrimAlts alts deflt)
- = mapRn rn_alt alts `thenRn` \ alts' ->
- rnCoreDefault deflt `thenRn` \ deflt' ->
- returnRn (UfPrimAlts alts' deflt')
- where
- rn_alt (lit, rhs) = rnCoreExpr rhs `thenRn` \ rhs' ->
- returnRn (lit, rhs')
+rnCoreAlt (con, bndrs, rhs)
+ = rnUfCon con bndrs `thenRn` \ con' ->
+ bindCoreLocalsRn bndrs $ \ bndrs' ->
+ rnCoreExpr rhs `thenRn` \ rhs' ->
+ returnRn (con', bndrs', rhs')
+
+rnNote (UfCoerce ty)
+ = rnHsType (text "unfolding coerce") ty `thenRn` \ ty' ->
+ returnRn (UfCoerce ty')
+
+rnNote (UfSCC cc) = returnRn (UfSCC cc)
+rnNote UfInlineCall = returnRn UfInlineCall
+rnNote UfInlineMe = returnRn UfInlineMe
+
+
+rnUfCon UfDefault _
+ = returnRn UfDefault
+
+rnUfCon (UfTupleAlt tup_con) bndrs
+ = rnHsTupCon tup_con `thenRn` \ (HsTupCon con' _) ->
+ returnRn (UfDataAlt con')
+ -- Makes the type checker a little easier
-rnCoreDefault UfNoDefault = returnRn UfNoDefault
-rnCoreDefault (UfBindDefault bndr rhs) = bindLocalsRn "unfolding default" [bndr] $ \ [bndr'] ->
- rnCoreExpr rhs `thenRn` \ rhs' ->
- returnRn (UfBindDefault bndr' rhs')
+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}
-rnCoercion (UfIn n) = lookupOccRn n `thenRn` \ n' -> returnRn (UfIn n')
-rnCoercion (UfOut n) = lookupOccRn n `thenRn` \ n' -> returnRn (UfOut n')
+%*********************************************************
+%* *
+\subsection{Rule shapes}
+%* *
+%*********************************************************
-rnCorePrim (UfOtherOp op)
- = lookupOccRn op `thenRn` \ op' ->
- returnRn (UfOtherOp op')
+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.
-rnCorePrim (UfCCallOp str casm gc arg_tys res_ty)
- = mapRn rnHsType arg_tys `thenRn` \ arg_tys' ->
- rnHsType res_ty `thenRn` \ res_ty' ->
- returnRn (UfCCallOp str casm gc arg_tys' res_ty')
+\begin{code}
+validRuleLhs foralls lhs
+ = check lhs
+ where
+ check (HsApp e1 e2) = check e1
+ check (HsVar v) | v `notElem` foralls = True
+ check other = False
\end{code}
+
%*********************************************************
-%* *
+%* *
\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)
-
-dupClassAssertWarn ctxt (assertion : dups)
- = sep [hsep [ptext SLIT("Duplicated class assertion"),
- quotes (pprClassAssertion assertion),
- ptext SLIT("in the context:")],
- nest 4 (pprContext ctxt)]
-
badDataCon name
= hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)]
-wierdAllErr assertion
- = ptext SLIT("Mal-formed use of `All':") <+> pprClassAssertion assertion
-
-ctxtErr1 doc tyvars
- = hsep [ptext SLIT("Context constrains in-scope type variable(s)"),
- pprQuotedList tyvars]
+forAllWarn doc ty tyvar
+ = doptRn Opt_WarnUnusedMatches `thenRn` \ warn_unused -> case () of
+ () | not warn_unused -> 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))]
+ $$
+ (ptext SLIT("In") <+> doc)
+ )
+ }
+
+badRuleLhsErr name lhs
+ = sep [ptext SLIT("Rule") <+> ptext name <> colon,
+ nest 4 (ptext SLIT("Illegal left-hand side:") <+> ppr lhs)]
$$
- nest 4 (ptext SLIT("in") <+> doc)
+ ptext SLIT("LHS must be of form (f e1 .. en) where f is not forall'd")
-ctxtErr2 doc tyvars ty
- = (ptext SLIT("Context constrains type variable(s)")
- <+> pprQuotedList tyvars)
- $$
- nest 4 (vcat [ptext SLIT("that do not appear in") <+> quotes (ppr ty),
- ptext SLIT("in") <+> doc])
+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