X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnSource.lhs;h=da6a06076e47752f95016a4e4cee72d3d3026a72;hb=111972366435025b2f73bba8b4bdbfdca654528e;hp=34966a75e7bc8a5ba76278e4ef20a0f23dc0aa71;hpb=3160f854580e6d8df412c8cd34d93bae27175d67;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnSource.lhs b/ghc/compiler/rename/RnSource.lhs index 34966a7..da6a060 100644 --- a/ghc/compiler/rename/RnSource.lhs +++ b/ghc/compiler/rename/RnSource.lhs @@ -4,127 +4,260 @@ \section[RnSource]{Main pass of renamer} \begin{code} -module RnSource ( rnIfaceDecl, rnSourceDecls, rnHsType, rnHsSigType ) where +module RnSource ( 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, elemRdrEnv ) +import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl, RdrNameTyClDecl, + extractRuleBndrsTyVars, extractHsTyRdrTyVars, + extractHsCtxtRdrTyVars, extractGenericPatTyVars + ) import RnHsSyn import HsCore -import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs ) -import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn, - lookupImplicitOccRn, addImplicitOccRn, - bindLocalsRn, - bindTyVarsFVRn, bindTyVarsFV2Rn, extendTyVarEnvRn, - checkDupOrQualNames, checkDupNames, - newLocallyDefinedGlobalName, newImportedGlobalName, - newImportedGlobalFromRdrName, - ifaceFlavour, newDFunName, - FreeVars, emptyFVs, plusFV, plusFVs, unitFV, addOneFV +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, - ExportFlag(..), Provenance(..), - nameOccName, NamedThing(..), isConOcc, - mkDefaultMethodOcc, mkDFunOcc - ) +import Class ( FunDep, DefMeth (..) ) +import DataCon ( dataConId ) +import Name ( Name, NamedThing(..) ) import NameSet -import BasicTypes ( TopLevelFlag(..), IfaceFlavour(..) ) -import TysWiredIn ( tupleTyCon, unboxedTupleTyCon, listTyCon ) -import Type ( funTyCon ) -import FiniteMap ( elemFM ) -import PrelInfo ( derivingOccurrences, numClass_RDR, - deRefStablePtr_NAME, makeStablePtr_NAME, - bindIO_NAME +import PrelInfo ( derivableClassKeys, cCallishClassKeys ) +import PrelNames ( deRefStablePtr_RDR, newStablePtr_RDR, + bindIO_RDR, returnIO_RDR ) -import Bag ( bagToList ) +import TysWiredIn ( tupleCon ) +import List ( partition, nub ) import Outputable import SrcLoc ( SrcLoc ) -import UniqFM ( lookupUFM ) +import CmdLineOpts ( DynFlag(..) ) + -- Warn of unused for-all'd tyvars +import Unique ( Uniquable(..) ) import Maybes ( maybeToBool ) -import Util +import ErrUtils ( Message ) +import CStrings ( isCLabelString ) +import ListSetOps ( removeDupsEq ) \end{code} -rnDecl `renames' declarations. +@rnSourceDecl@ `renames' declarations. It simultaneously performs dependency analysis and precedence parsing. It also does the following error checks: \begin{enumerate} \item Checks that tyvars are used properly. This includes checking for undefined tyvars, and tyvars in contexts that are ambiguous. +(Some of this checking has now been moved to module @TcMonoType@, +since we don't have functional dependency information at this point.) \item Checks that all variable occurences are defined. \item -Checks the (..) etc constraints in the export list. +Checks the @(..)@ etc constraints in the export list. \end{enumerate} %********************************************************* %* * -\subsection{Value declarations} +\subsection{Source code declarations} %* * %********************************************************* \begin{code} -rnSourceDecls :: [RdrNameHsDecl] -> RnMS s ([RenamedHsDecl], FreeVars) +rnSourceDecls :: GlobalRdrEnv -> LocalFixityEnv + -> [RdrNameHsDecl] + -> RnMG ([RenamedHsDecl], FreeVars) -- The decls get reversed, but that's ok -rnSourceDecls decls - = go emptyFVs [] decls +rnSourceDecls gbl_env local_fixity_env decls + = initRnMS gbl_env emptyRdrEnv local_fixity_env SourceMode (go emptyFVs [] decls) + where + -- Fixity and deprecations have been dealt with already; ignore them + go fvs ds' [] = returnRn (ds', fvs) + go fvs ds' (FixD _:ds) = go fvs ds' ds + go fvs ds' (DeprecD _:ds) = go fvs ds' ds + go fvs ds' (d:ds) = rnSourceDecl d `thenRn` \(d', fvs') -> + go (fvs `plusFV` fvs') (d':ds') ds + + +rnSourceDecl :: RdrNameHsDecl -> RnMS (RenamedHsDecl, FreeVars) + +rnSourceDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) -> + returnRn (ValD new_binds, fvs) + +rnSourceDecl (TyClD tycl_decl) + = rnTyClDecl tycl_decl `thenRn` \ new_decl -> + finishSourceTyClDecl tycl_decl new_decl `thenRn` \ (new_decl', fvs) -> + returnRn (TyClD new_decl', fvs `plusFV` tyClDeclFVs new_decl') + +rnSourceDecl (InstD inst) + = rnInstDecl inst `thenRn` \ new_inst -> + finishSourceInstDecl inst new_inst `thenRn` \ (new_inst', fvs) -> + returnRn (InstD new_inst', fvs `plusFV` instDeclFVs new_inst') + +rnSourceDecl (RuleD rule) + = rnHsRuleDecl rule `thenRn` \ (new_rule, fvs) -> + returnRn (RuleD new_rule, fvs) + +rnSourceDecl (DefD (DefaultDecl tys src_loc)) + = pushSrcLocRn src_loc $ + mapFvRn (rnHsTypeFVs doc_str) tys `thenRn` \ (tys', fvs) -> + returnRn (DefD (DefaultDecl tys' src_loc), fvs) 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' + doc_str = text "a `default' declaration" + +rnSourceDecl (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_` + + extra_fvs imp_exp `thenRn` \ fvs1 -> + + 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 + + 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{Value declarations} +\subsection{Instance declarations} %* * %********************************************************* \begin{code} --- rnDecl does all the work -rnDecl :: RdrNameHsDecl -> RnMS s (RenamedHsDecl, FreeVars) +rnInstDecl (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc) + -- Used for both source and interface file decls + = pushSrcLocRn src_loc $ + rnHsSigType (text "an instance decl") inst_ty `thenRn` \ inst_ty' -> + + (case maybe_dfun_rdr_name of + Nothing -> returnRn Nothing + Just dfun_rdr_name -> lookupIfaceName dfun_rdr_name `thenRn` \ dfun_name -> + returnRn (Just dfun_name) + ) `thenRn` \ maybe_dfun_name -> + + -- The typechecker checks that all the bindings are for the right class. + returnRn (InstDecl inst_ty' EmptyMonoBinds [] maybe_dfun_name src_loc) + +-- Compare finishSourceTyClDecl +finishSourceInstDecl (InstDecl _ mbinds uprags _ _ ) + (InstDecl inst_ty _ _ maybe_dfun_name src_loc) + -- Used for both source decls only + = ASSERT( not (maybeToBool maybe_dfun_name) ) -- Source decl! + let + meth_doc = text "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 -rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) -> - returnRn (ValD new_binds, fvs) + -- Rename the bindings + -- NB meth_names can be qualified! + checkDupNames meth_doc meth_names `thenRn_` + extendTyVarEnvFVRn (map hsTyVarName inst_tyvars) ( + rnMethodBinds [] mbinds + ) `thenRn` \ (mbinds', meth_fvs) -> + let + binders = collectMonoBinders mbinds' + binder_set = mkNameSet binders + in + -- Rename the prags and signatures. + -- Note that the type variables are not in scope here, + -- so that instance Eq a => Eq (T a) where + -- {-# SPECIALISE instance Eq a => Eq (T [a]) #-} + -- works OK. + -- + -- But the (unqualified) method names are in scope + bindLocalNames binders ( + renameSigsFVs (okInstDclSig binder_set) uprags + ) `thenRn` \ (uprags', prag_fvs) -> + + returnRn (InstDecl inst_ty mbinds' uprags' maybe_dfun_name src_loc, + meth_fvs `plusFV` prag_fvs) +\end{code} +%********************************************************* +%* * +\subsection{Rules} +%* * +%********************************************************* -rnDecl (SigD (IfaceSig name ty id_infos loc)) - = pushSrcLocRn loc $ - lookupBndrRn name `thenRn` \ name' -> - rnIfaceType doc_str ty `thenRn` \ ty' -> - - -- Get the pragma info (if any). - 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), emptyFVs) - -- Don't need free-var info for iface binds +\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 - doc_str = text "the interface signature for" <+> quotes (ppr name) + 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{Type declarations} +\subsection{Type, class and iface sig declarations} %* * %********************************************************* @@ -134,210 +267,170 @@ 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. +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 (TyClD (TyData new_or_data context tycon tyvars condecls derivings pragmas 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, + tcdLoc = src_loc, tcdSysNames = sys_names}) = pushSrcLocRn src_loc $ - lookupBndrRn tycon `thenRn` \ tycon' -> - bindTyVarsFVRn data_doc tyvars $ \ tyvars' -> - rnContext data_doc context `thenRn` \ (context', cxt_fvs) -> - checkDupOrQualNames data_doc con_names `thenRn_` - mapAndUnzipRn rnConDecl condecls `thenRn` \ (condecls', con_fvs_s) -> - rnDerivs derivings `thenRn` \ (derivings', deriv_fvs) -> - ASSERT(isNoDataPragmas pragmas) - returnRn (TyClD (TyData new_or_data context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc), - cxt_fvs `plusFV` plusFVs con_fvs_s `plusFV` deriv_fvs) + 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' -> + returnRn (TyData {tcdND = new_or_data, tcdCtxt = context', tcdName = tycon', + tcdTyVars = tyvars', tcdCons = condecls', tcdNCons = nconstrs, + tcdDerivs = Nothing, tcdLoc = src_loc, tcdSysNames = sys_names'}) where - data_doc = text "the data type declaration for" <+> ppr tycon + data_doc = text "the data type declaration for" <+> quotes (ppr tycon) con_names = map conDeclName condecls -rnDecl (TyClD (TySynonym name tyvars ty src_loc)) +rnTyClDecl (TySynonym {tcdName = name, tcdTyVars = tyvars, tcdSynRhs = ty, tcdLoc = src_loc}) = pushSrcLocRn src_loc $ - lookupBndrRn name `thenRn` \ name' -> - bindTyVarsFVRn syn_doc tyvars $ \ tyvars' -> - rnHsType syn_doc ty `thenRn` \ (ty', ty_fvs) -> - returnRn (TyClD (TySynonym name' tyvars' ty' src_loc), ty_fvs) + 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) -rnDecl (TyClD (ClassDecl context cname tyvars sigs mbinds pragmas tname dname src_loc)) + -- 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}) + -- Used for both source and interface file decls = pushSrcLocRn src_loc $ - lookupBndrRn cname `thenRn` \ cname' -> + 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! - -- 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' -> + mapRn lookupSysBinder names `thenRn` \ names' -> -- Tyvars scope over bindings and context - bindTyVarsFV2Rn cls_doc tyvars ( \ clas_tyvar_names tyvars' -> + bindTyVars2Rn cls_doc tyvars $ \ clas_tyvar_names tyvars' -> -- Check the superclasses - rnContext cls_doc context `thenRn` \ (context', cxt_fvs) -> + 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 - -- Filter out fixity signatures; - -- they are done at top level - nofix_sigs = nonFixitySigs sigs + (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_` - mapAndUnzipRn (rn_op cname' clas_tyvar_names) nofix_sigs `thenRn` \ (sigs', sig_fvs_s) -> - - -- Check the methods - checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_` - rnMethodBinds mbinds `thenRn` \ (mbinds', meth_fvs) -> + 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. - ASSERT(isNoClassPragmas pragmas) - returnRn (TyClD (ClassDecl context' cname' tyvars' sigs' mbinds' NoClassPragmas tname' dname' src_loc), - plusFVs sig_fvs_s `plusFV` cxt_fvs `plusFV` meth_fvs) - ) + 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 - 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 -> - - -- 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 = mkDefaultMethodOcc (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 -> - - - returnRn (ClassOpSig op_name maybe_dm_name new_ty locn, op_ty_fvs) -\end{code} - - -%********************************************************* -%* * -\subsection{Instance declarations} -%* * -%********************************************************* -\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', inst_fvs) -> +rnClassOp clas clas_tyvars clas_fds sig@(ClassOpSig op dm_stuff ty locn) + = pushSrcLocRn locn $ + lookupTopBndrRn op `thenRn` \ op_name -> + + -- Check the signature + rnHsSigType (quotes (ppr op)) ty `thenRn` \ new_ty -> + + -- Make the default-method name + (case dm_stuff of + DefMeth dm_rdr_name + -> -- Imported class that has a default method decl + -- See comments with tname, snames, above + lookupSysBinder dm_rdr_name `thenRn` \ dm_name -> + returnRn (DefMeth dm_name) + -- An imported class decl for a class decl that had an explicit default + -- method, mentions, rather than defines, + -- the default method, so we must arrange to pull it in + + GenDefMeth -> returnRn GenDefMeth + NoDefMeth -> returnRn NoDefMeth + ) `thenRn` \ dm_stuff' -> + + returnRn (ClassOpSig op_name dm_stuff' new_ty locn) + +finishSourceTyClDecl :: RdrNameTyClDecl -> RenamedTyClDecl -> RnMS (RenamedTyClDecl, FreeVars) + -- Used for source file decls only + -- Renames the default-bindings of a class decl + -- the derivings of a data decl +finishSourceTyClDecl (TyData {tcdDerivs = Just derivs, tcdLoc = src_loc}) -- Derivings in here + rn_ty_decl -- Everything else is here + = pushSrcLocRn src_loc $ + mapRn rnDeriv derivs `thenRn` \ derivs' -> + returnRn (rn_ty_decl {tcdDerivs = Just derivs'}, mkNameSet derivs') + +finishSourceTyClDecl (ClassDecl {tcdMeths = Just mbinds, tcdLoc = src_loc}) -- Get mbinds from here + rn_cls_decl@(ClassDecl {tcdTyVars = tyvars}) -- Everything else is here + -- There are some default-method bindings (abeit possibly empty) so + -- this is a source-code class declaration + = -- The newLocals call is tiresome: given a generic class decl + -- class C a where + -- op :: a -> a + -- op {| x+y |} (Inl a) = ... + -- op {| x+y |} (Inr b) = ... + -- op {| a*b |} (a*b) = ... + -- we want to name both "x" tyvars with the same unique, so that they are + -- easy to group together in the typechecker. + -- Hence the + pushSrcLocRn src_loc $ + extendTyVarEnvFVRn (map hsTyVarName tyvars) $ + getLocalNameEnv `thenRn` \ name_env -> let - inst_tyvars = case inst_ty' of - HsForAllTy inst_tyvars _ _ -> inst_tyvars - other -> [] - -- (Slightly strangely) the forall-d tyvars scope over - -- the method bindings too + meth_rdr_names_w_locs = collectLocatedMonoBinders mbinds + gen_rdr_tyvars_w_locs = [(tv,src_loc) | tv <- extractGenericPatTyVars mbinds, + not (tv `elemRdrEnv` name_env)] in - extendTyVarEnvRn inst_tyvars $ - - -- Rename the bindings - -- NB meth_names can be qualified! - checkDupNames meth_doc meth_names `thenRn_` - rnMethodBinds mbinds `thenRn` \ (mbinds', meth_fvs) -> - let - binders = mkNameSet (map fst (bagToList (collectMonoBinders mbinds'))) - in - renameSigs NotTopLevel True binders uprags `thenRn` \ new_uprags -> - 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), - inst_fvs `plusFV` meth_fvs) + 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 bindings in an instance declaration" - meth_names = bagToList (collectMonoBinders mbinds) -\end{code} - -%********************************************************* -%* * -\subsection{Default declarations} -%* * -%********************************************************* + meth_doc = text "the default-methods for class" <+> ppr (tcdName rn_cls_decl) -\begin{code} -rnDecl (DefD (DefaultDecl tys src_loc)) - = pushSrcLocRn src_loc $ - rnHsTypes doc_str tys `thenRn` \ (tys', fvs) -> - lookupImplicitOccRn numClass_RDR `thenRn_` - returnRn (DefD (DefaultDecl tys' src_loc), fvs) - where - doc_str = text "a `default' declaration" +finishSourceTyClDecl _ tycl_decl = returnRn (tycl_decl, emptyFVs) + -- Not a class declaration \end{code} -%********************************************************* -%* * -\subsection{Foreign declarations} -%* * -%********************************************************* - -\begin{code} -rnDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc)) - = pushSrcLocRn src_loc $ - lookupBndrRn name `thenRn` \ name' -> - (case imp_exp of - FoImport _ | not isDyn -> addImplicitOccRn name' - FoLabel -> addImplicitOccRn name' - FoExport | isDyn -> - addImplicitOccRn makeStablePtr_NAME `thenRn_` - addImplicitOccRn deRefStablePtr_NAME `thenRn_` - addImplicitOccRn bindIO_NAME `thenRn_` - returnRn name' - _ -> 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 - -\end{code} %********************************************************* %* * @@ -346,85 +439,66 @@ rnDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc)) %********************************************************* \begin{code} -rnDerivs :: Maybe [RdrName] -> RnMS s (Maybe [Name], FreeVars) - -rnDerivs Nothing -- derivs not specified - = returnRn (Nothing, emptyFVs) - -rnDerivs (Just ds) - = mapRn rn_deriv ds `thenRn` \ derivs -> - returnRn (Just derivs, mkNameSet derivs) - 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 - +rnDeriv :: RdrName -> RnMS Name +rnDeriv cls + = lookupOccRn cls `thenRn` \ clas_name -> + checkRn (getUnique clas_name `elem` derivableClassKeys) + (derivingNonStdClassErr clas_name) `thenRn_` + returnRn clas_name \end{code} \begin{code} conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc) -conDeclName (ConDecl n _ _ _ l) = (n,l) +conDeclName (ConDecl n _ _ _ _ l) = (n,l) -rnConDecl :: RdrNameConDecl -> RnMS s (RenamedConDecl, FreeVars) -rnConDecl (ConDecl name tvs 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 -> - 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) + 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) - = mapAndUnzipRn (rnBangTy doc) tys `thenRn` \ (new_tys, fvs_s) -> - returnRn (VanillaCon new_tys, plusFVs fvs_s) + = mapRn (rnBangTy doc) tys `thenRn` \ new_tys -> + returnRn (VanillaCon new_tys) 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) - -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) + = rnBangTy doc ty1 `thenRn` \ new_ty1 -> + rnBangTy doc ty2 `thenRn` \ new_ty2 -> + returnRn (InfixCon new_ty1 new_ty2) rnConDetails doc locn (RecCon fields) = checkDupOrQualNames doc field_names `thenRn_` - mapAndUnzipRn (rnField doc) fields `thenRn` \ (new_fields, fvs_s) -> - returnRn (RecCon new_fields, plusFVs fvs_s) + mapRn (rnField doc) fields `thenRn` \ new_fields -> + returnRn (RecCon new_fields) 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) + = mapRn lookupTopBndrRn names `thenRn` \ new_names -> + rnBangTy doc ty `thenRn` \ new_ty -> + returnRn (new_names, new_ty) rnBangTy doc (Banged ty) - = rnHsType doc ty `thenRn` \ (new_ty, fvs) -> - returnRn (Banged new_ty, fvs) + = rnHsType doc ty `thenRn` \ new_ty -> + returnRn (Banged new_ty) rnBangTy doc (Unbanged ty) - = rnHsType doc ty `thenRn` \ (new_ty, fvs) -> - returnRn (Unbanged new_ty, fvs) + = 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 @@ -437,251 +511,240 @@ rnBangTy doc (Unbanged ty) -- from interface files, which always print in prefix form checkConName name - = checkRn (isConOcc (rdrNameOcc name)) + = checkRn (isRdrDataCon name) (badDataCon name) \end{code} %********************************************************* %* * -\subsection{Naming a dfun} +\subsection{Support code to rename types} %* * %********************************************************* -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} +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') -%********************************************************* -%* * -\subsection{Support code to rename types} -%* * -%********************************************************* - -\begin{code} -rnHsSigType :: SDoc -> RdrNameHsType -> RnMS s (RenamedHsType, FreeVars) +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 -rnIfaceType :: SDoc -> RdrNameHsType -> RnMS s RenamedHsType -rnIfaceType doc ty - = rnHsType doc ty `thenRn` \ (ty,_) -> - returnRn ty - -rnHsType :: SDoc -> RdrNameHsType -> RnMS s (RenamedHsType, FreeVars) - -rnHsType doc (HsForAllTy [] ctxt ty) - -- From source code (no kinds on tyvars) +--------------------------------------- +rnHsType :: SDoc -> RdrNameHsType -> RnMS RenamedHsType +rnHsType doc (HsForAllTy Nothing ctxt ty) + -- Implicit quantifiction in source code (no kinds on tyvars) -- Given the signature C => T we universally quantify -- over FV(T) \ {in-scope-tyvars} - -- - -- 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 = [] + 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 - mapRn (ctxtErr1 doc forall_tyvars ty) non_poly_constraints `thenRn_` - mapRn (ctxtErr2 doc ty) non_mentioned_constraints `thenRn_` - - (bindTyVarsFVRn doc (map UserTyVar 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) - ) - -rnHsType doc (HsForAllTy tvs ctxt ty) - -- tvs are non-empty, hence must be from an interface file - -- (tyvars may be kinded) - = bindTyVarsFVRn doc tvs $ \ 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) - -rnHsType doc (MonoTyVar tyvar) + 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 + mapRn_ (forAllWarn doc tau) warn_guys `thenRn_` + rnForAll doc forall_tyvars ctxt tau + +rnHsType doc (HsTyVar tyvar) = lookupOccRn tyvar `thenRn` \ tyvar' -> - returnRn (MonoTyVar tyvar', unitFV tyvar') - -rnHsType doc (MonoFunTy ty1 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', fvs) -> - returnRn (MonoListTy ty', fvs `addOneFV` listTyCon_name) - -rnHsType doc (MonoTupleTy tys boxed) - = addImplicitOccRn tup_con_name `thenRn_` - rnHsTypes doc tys `thenRn` \ (tys', fvs) -> - returnRn (MonoTupleTy tys' boxed, fvs `addOneFV` tup_con_name) + returnRn (HsTyVar tyvar') + +rnHsType doc (HsOpTy ty1 opname ty2) + = lookupOccRn opname `thenRn` \ name' -> + rnHsType doc ty1 `thenRn` \ ty1' -> + rnHsType doc ty2 `thenRn` \ ty2' -> + returnRn (HsOpTy ty1' name' ty2') + +rnHsType doc (HsNumTy i) + | i == 1 = returnRn (HsNumTy i) + | otherwise = failWithRn (HsNumTy i) + (ptext SLIT("Only unit numeric type pattern is valid")) + +rnHsType doc (HsFunTy ty1 ty2) + = rnHsType doc ty1 `thenRn` \ ty1' -> + -- Might find a for-all as the arg of a function type + rnHsType doc ty2 `thenRn` \ ty2' -> + -- Or as the result. This happens when reading Prelude.hi + -- when we find return :: forall m. Monad m -> forall a. a -> m a + returnRn (HsFunTy ty1' ty2') + +rnHsType doc (HsListTy ty) + = rnHsType doc ty `thenRn` \ ty' -> + returnRn (HsListTy ty') + +-- Unboxed tuples are allowed to have poly-typed arguments. These +-- sometimes crop up as a result of CPR worker-wrappering dictionaries. +rnHsType doc (HsTupleTy (HsTupCon _ boxity arity) tys) + -- Don't do lookupOccRn, because this is built-in syntax + -- so it doesn't need to be in scope + = mapRn (rnHsType doc) tys `thenRn` \ tys' -> + returnRn (HsTupleTy (HsTupCon tup_name boxity arity) tys') where - tup_con_name = tupleTyCon_name boxed (length tys) + tup_name = tupleTyCon_name boxity arity + -rnHsType doc (MonoTyApp ty1 ty2) - = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) -> - rnHsType doc ty2 `thenRn` \ (ty2', fvs2) -> - returnRn (MonoTyApp ty1' ty2', fvs1 `plusFV` fvs2) +rnHsType doc (HsAppTy ty1 ty2) + = rnHsType doc ty1 `thenRn` \ ty1' -> + rnHsType doc ty2 `thenRn` \ ty2' -> + returnRn (HsAppTy ty1' ty2') -rnHsType doc (MonoDictTy clas tys) - = lookupOccRn clas `thenRn` \ clas' -> - rnHsTypes doc tys `thenRn` \ (tys', fvs) -> - returnRn (MonoDictTy clas' tys', fvs `addOneFV` clas') +rnHsType doc (HsPredTy pred) + = rnPred doc pred `thenRn` \ pred' -> + returnRn (HsPredTy pred') -rnHsTypes doc tys - = mapAndUnzipRn (rnHsType doc) tys `thenRn` \ (tys, fvs_s) -> - returnRn (tys, plusFVs fvs_s) +rnHsTypes doc tys = mapRn (rnHsType doc) tys \end{code} - \begin{code} -rnContext :: SDoc -> RdrNameContext -> RnMS s (RenamedContext, FreeVars) +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} +\begin{code} +rnContext :: SDoc -> RdrNameContext -> RnMS RenamedContext rnContext doc ctxt - = mapAndUnzipRn rn_ctxt ctxt `thenRn` \ (theta, fvs_s) -> + = mapRn rn_pred ctxt `thenRn` \ theta -> let - (_, dup_asserts) = removeDups cmp_assert theta + (_, 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_` + mapRn (addWarnRn . dupClassAssertWarn theta) dups `thenRn_` + returnRn theta + where + --Someone discovered that @CCallable@ and @CReturnable@ + -- could be used in contexts such as: + -- foo :: CCallable a => a -> PrimIO Int + -- Doing this utterly wrecks the whole point of introducing these + -- classes so we specifically check that this isn't being done. + rn_pred pred = rnPred doc pred `thenRn` \ pred'-> + checkRn (not (bad_pred pred')) + (naughtyCCallContextErr pred') `thenRn_` + returnRn pred' + + bad_pred (HsClassP clas _) = getUnique clas `elem` cCallishClassKeys + bad_pred other = False + + +rnPred doc (HsClassP clas tys) + = lookupOccRn clas `thenRn` \ clas_name -> + rnHsTypes doc tys `thenRn` \ tys' -> + returnRn (HsClassP clas_name tys') + +rnPred doc (HsIParam n ty) + = newIPName n `thenRn` \ name -> + rnHsType doc ty `thenRn` \ ty' -> + returnRn (HsIParam name ty') +\end{code} - returnRn (theta, plusFVs fvs_s) +\begin{code} +rnFds :: SDoc -> [FunDep RdrName] -> RnMS [FunDep Name] + +rnFds doc fds + = mapRn rn_fds fds where - rn_ctxt (clas, tys) - = lookupOccRn clas `thenRn` \ clas_name -> - rnHsTypes doc tys `thenRn` \ (tys', fvs) -> - returnRn ((clas_name, tys'), fvs `addOneFV` clas_name) + rn_fds (tys1, tys2) + = rnHsTyVars doc tys1 `thenRn` \ tys1' -> + rnHsTyVars doc tys2 `thenRn` \ tys2' -> + returnRn (tys1', tys2') - cmp_assert (c1,tys1) (c2,tys2) - = (c1 `compare` c2) `thenCmp` (cmpHsTypes compare 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 (HsUnfold inline (Just expr)) = rnCoreExpr expr `thenRn` \ expr' -> - returnRn (HsUnfold inline (Just expr')) -rnIdInfo (HsUnfold inline Nothing) = returnRn (HsUnfold inline Nothing) -rnIdInfo (HsArity arity) = returnRn (HsArity arity) -rnIdInfo (HsUpdate update) = returnRn (HsUpdate update) -rnIdInfo (HsNoCafRefs) = returnRn (HsNoCafRefs) -rnIdInfo (HsSpecialise tyvars tys expr) - = bindTyVarsRn doc tyvars $ \ tyvars' -> - rnCoreExpr expr `thenRn` \ expr' -> - 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. +rnIdInfo (HsWorker worker arity) = lookupOccRn worker `thenRn` \ worker' -> - mapRn lookupOccRn cons `thenRn_` - returnRn (HsStrictnessInfo demands (Just (worker',[]))) + returnRn (HsWorker worker' arity) --- Boring, but necessary for the type checker. -rnStrict (HsStrictnessInfo demands Nothing) = returnRn (HsStrictnessInfo demands Nothing) -rnStrict HsBottom = returnRn HsBottom +rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ expr' -> + returnRn (HsUnfold inline expr') +rnIdInfo (HsStrictness str) = returnRn (HsStrictness str) +rnIdInfo (HsArity arity) = returnRn (HsArity arity) +rnIdInfo HsNoCafRefs = returnRn HsNoCafRefs +rnIdInfo HsCprInfo = returnRn HsCprInfo \end{code} -UfCore expressions. +@UfCore@ expressions. \begin{code} rnCoreExpr (UfType ty) - = rnIfaceType (text "unfolding type") ty `thenRn` \ ty' -> + = rnHsType (text "unfolding type") ty `thenRn` \ ty' -> returnRn (UfType ty') rnCoreExpr (UfVar v) = lookupOccRn v `thenRn` \ v' -> returnRn (UfVar v') -rnCoreExpr (UfCon con args) - = rnUfCon con `thenRn` \ con' -> - mapRn rnCoreExpr args `thenRn` \ args' -> - returnRn (UfCon con' args') +rnCoreExpr (UfLit l) + = returnRn (UfLit l) -rnCoreExpr (UfTuple con args) - = lookupOccRn con `thenRn` \ con' -> - mapRn rnCoreExpr args `thenRn` \ args' -> - returnRn (UfTuple con' args') +rnCoreExpr (UfLitLit l ty) + = rnHsType (text "litlit") ty `thenRn` \ ty' -> + returnRn (UfLitLit l ty') + +rnCoreExpr (UfCCall cc ty) + = rnHsType (text "ccall") ty `thenRn` \ ty' -> + returnRn (UfCCall cc ty') + +rnCoreExpr (UfTuple (HsTupCon _ boxity arity) args) + = mapRn rnCoreExpr args `thenRn` \ args' -> + returnRn (UfTuple (HsTupCon tup_name boxity arity) args') + where + tup_name = getName (dataConId (tupleCon boxity arity)) + -- Get the *worker* name and use that rnCoreExpr (UfApp fun arg) = rnCoreExpr fun `thenRn` \ fun' -> rnCoreExpr arg `thenRn` \ arg' -> returnRn (UfApp fun' arg') -rnCoreExpr (UfCase scrut bndr alts) +rnCoreExpr (UfCase scrut bndr alts) = rnCoreExpr scrut `thenRn` \ scrut' -> - bindLocalsRn "UfCase" [bndr] $ \ [bndr'] -> + bindCoreLocalRn bndr $ \ bndr' -> mapRn rnCoreAlt alts `thenRn` \ alts' -> returnRn (UfCase scrut' bndr' alts') rnCoreExpr (UfNote note expr) = rnNote note `thenRn` \ note' -> rnCoreExpr expr `thenRn` \ expr' -> - returnRn (UfNote note' expr') + returnRn (UfNote note' expr') rnCoreExpr (UfLam bndr body) = rnCoreBndr bndr $ \ bndr' -> @@ -705,106 +768,133 @@ rnCoreExpr (UfLet (UfRec pairs) body) \begin{code} rnCoreBndr (UfValBinder name ty) thing_inside - = rnIfaceType (text str) ty `thenRn` \ ty' -> - bindLocalsRn str [name] $ \ [name'] -> + = rnHsType doc ty `thenRn` \ ty' -> + bindCoreLocalRn name $ \ name' -> thing_inside (UfValBinder name' ty') where - str = "unfolding id" + 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 (rnIfaceType (text str)) tys `thenRn` \ tys' -> - bindLocalsRn str names $ \ names' -> - thing_inside (zipWith UfValBinder names' tys') - where - str = "unfolding id" - names = map (\ (UfValBinder name _ ) -> name) bndrs - tys = map (\ (UfValBinder _ ty) -> ty) bndrs +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 `thenRn` \ con' -> - bindLocalsRn "unfolding alt" bndrs $ \ bndrs' -> + = rnUfCon con `thenRn` \ con' -> + bindCoreLocalsRn bndrs $ \ bndrs' -> rnCoreExpr rhs `thenRn` \ rhs' -> returnRn (con', bndrs', rhs') - rnNote (UfCoerce ty) - = rnIfaceType (text "unfolding coerce") ty `thenRn` \ 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 (UfDataCon con) +rnUfCon (UfTupleAlt (HsTupCon _ boxity arity)) + = returnRn (UfTupleAlt (HsTupCon tup_name boxity arity)) + where + tup_name = getName (tupleCon boxity arity) + +rnUfCon (UfDataAlt con) = lookupOccRn con `thenRn` \ con' -> - returnRn (UfDataCon con') + returnRn (UfDataAlt con') -rnUfCon (UfLitCon lit) - = returnRn (UfLitCon lit) +rnUfCon (UfLitAlt lit) + = returnRn (UfLitAlt lit) -rnUfCon (UfLitLitCon lit ty) - = rnIfaceType (text "litlit") ty `thenRn` \ ty' -> - returnRn (UfLitLitCon lit ty') +rnUfCon (UfLitLitAlt lit ty) + = rnHsType (text "litlit") ty `thenRn` \ ty' -> + returnRn (UfLitLitAlt lit ty') +\end{code} -rnUfCon (UfPrimOp op) - = lookupOccRn op `thenRn` \ op' -> - returnRn (UfPrimOp op') +%********************************************************* +%* * +\subsection{Rule shapes} +%* * +%********************************************************* -rnUfCon (UfCCallOp str casm gc) - = returnRn (UfCCallOp str casm gc) +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} +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) +badDataCon name + = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)] + +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))] + $$ + (ptext SLIT("In") <+> doc) + ) + } + +badRuleLhsErr name lhs + = sep [ptext SLIT("Rule") <+> ptext name <> colon, + nest 4 (ptext SLIT("Illegal left-hand side:") <+> ppr lhs)] + $$ + 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 (pprClassAssertion assertion), + quotes (ppr assertion), ptext SLIT("in the context:")], - nest 4 (pprContext ctxt)] - -badDataCon name - = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)] + nest 4 (pprHsContext ctxt <+> ptext SLIT("..."))] -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)) - ] - $$ - (ptext SLIT("In") <+> doc) - ) - -ctxtErr2 doc ty (constraint,_) - = addErrRn ( - sep [ptext SLIT("The constraint") <+> quotes (pprClassAssertion constraint), - nest 4 (ptext SLIT("mentions type variables that do not appear in the type")), - nest 4 (quotes (ppr ty))] - $$ - (ptext SLIT("In") <+> doc) - ) +naughtyCCallContextErr (HsClassP clas _) + = sep [ptext SLIT("Can't use class") <+> quotes (ppr clas), + ptext SLIT("in a context")] \end{code}