X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;ds=sidebyside;f=ghc%2Fcompiler%2Frename%2FRnSource.lhs;h=26e6dee936f88cd196c79a3bcb7798f96948a757;hb=a8eecb891f9ca609b1ca96dee520124b00ece40f;hp=51f9ea37c8b53e20976788ff370567e9203d9af7;hpb=d133b73a4d4717892ced072d05e039a54ede0ceb;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnSource.lhs b/ghc/compiler/rename/RnSource.lhs index 51f9ea3..6ee9f8a 100644 --- a/ghc/compiler/rename/RnSource.lhs +++ b/ghc/compiler/rename/RnSource.lhs @@ -4,269 +4,316 @@ \section[RnSource]{Main pass of renamer} \begin{code} -module RnSource ( rnIfaceDecl, rnSourceDecls, rnHsType, rnHsSigType ) where +module RnSource ( + rnSrcDecls, addTcgDUs, + rnTyClDecls, checkModDeprec, + rnBindGroups, rnBindGroupsAndThen, rnSplice + ) where #include "HsVersions.h" -import RnExpr import HsSyn -import HsDecls ( HsIdInfo(..), HsStrictnessInfo(..) ) -import HsPragmas -import HsTypes ( getTyVarName, pprClassAssertion, cmpHsTypes ) -import RdrName ( RdrName, isRdrDataCon, rdrNameOcc ) -import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl, - extractHsTyVars - ) +import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, elemLocalRdrEnv ) +import RdrHsSyn ( extractGenericPatTyVars ) import RnHsSyn -import HsCore - -import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, unknownSigErr ) -import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn, - lookupImplicitOccRn, addImplicitOccRn, - bindLocalsRn, - bindTyVarsFVRn, bindTyVarsFV2Rn, extendTyVarEnvFVRn, - checkDupOrQualNames, checkDupNames, - newLocallyDefinedGlobalName, newImportedGlobalName, - newImportedGlobalFromRdrName, - newDFunName, - FreeVars, emptyFVs, plusFV, plusFVs, unitFV, addOneFV +import RnExpr ( rnLExpr, checkTH ) +import RnTypes ( rnLHsType, rnLHsTypes, rnHsSigType, rnHsTypeFVs, rnContext ) +import RnBinds ( rnTopBinds, rnBinds, rnMethodBinds, + rnBindsAndThen, renameSigs, checkSigs ) +import RnEnv ( lookupTopBndrRn, lookupTopFixSigNames, + lookupLocatedTopBndrRn, lookupLocatedOccRn, + lookupOccRn, newLocalsRn, + bindLocatedLocalsFV, bindPatSigTyVarsFV, + bindTyVarsRn, extendTyVarEnvFVRn, + bindLocalNames, newIPNameRn, + checkDupNames, mapFvRn, + unknownNameErr ) -import RnMonad +import TcRnMonad -import Name ( Name, OccName, - ExportFlag(..), Provenance(..), - nameOccName, NamedThing(..), - mkDefaultMethodOcc, mkDFunOcc - ) +import BasicTypes ( TopLevelFlag(..) ) +import HscTypes ( FixityEnv, FixItem(..), + Deprecations, Deprecs(..), DeprecTxt, plusDeprecs ) +import Class ( FunDep ) +import Name ( Name, nameOccName ) import NameSet -import BasicTypes ( TopLevelFlag(..) ) -import TysWiredIn ( tupleTyCon, unboxedTupleTyCon, listTyCon ) -import Type ( funTyCon ) -import FiniteMap ( elemFM ) -import PrelInfo ( derivingOccurrences, numClass_RDR, - deRefStablePtr_NAME, makeStablePtr_NAME, - bindIO_NAME - ) -import Bag ( bagToList ) -import List ( partition ) +import NameEnv import Outputable -import SrcLoc ( SrcLoc ) -import CmdLineOpts ( opt_WarnUnusedMatches ) -- Warn of unused for-all'd tyvars -import UniqFM ( lookupUFM ) -import Maybes ( maybeToBool, catMaybes ) -import Util +import SrcLoc ( Located(..), unLoc, getLoc, noLoc ) +import CmdLineOpts ( DynFlag(..) ) + -- Warn of unused for-all'd tyvars +import Maybes ( seqMaybe ) +import Maybe ( catMaybes, isNothing ) \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} +\begin{code} +rnSrcDecls :: HsGroup RdrName -> RnM (TcGblEnv, HsGroup Name) + +rnSrcDecls (HsGroup { hs_valds = [HsBindGroup binds sigs _], + hs_tyclds = tycl_decls, + hs_instds = inst_decls, + hs_fixds = fix_decls, + hs_depds = deprec_decls, + hs_fords = foreign_decls, + hs_defds = default_decls, + hs_ruleds = rule_decls }) + + = do { -- Deal with deprecations (returns only the extra deprecations) + deprecs <- rnSrcDeprecDecls deprec_decls ; + updGblEnv (\gbl -> gbl { tcg_deprecs = tcg_deprecs gbl `plusDeprecs` deprecs }) + $ do { + + -- Deal with top-level fixity decls + -- (returns the total new fixity env) + fix_env <- rnSrcFixityDecls fix_decls ; + updGblEnv (\gbl -> gbl { tcg_fix_env = fix_env }) + $ do { + + -- Rename other declarations + traceRn (text "Start rnmono") ; + (rn_val_decls, bind_dus) <- rnTopBinds binds sigs ; + traceRn (text "finish rnmono" <+> ppr rn_val_decls) ; + + -- You might think that we could build proper def/use information + -- for type and class declarations, but they can be involved + -- in mutual recursion across modules, and we only do the SCC + -- analysis for them in the type checker. + -- So we content ourselves with gathering uses only; that + -- means we'll only report a declaration as unused if it isn't + -- mentioned at all. Ah well. + (rn_tycl_decls, src_fvs1) + <- mapFvRn (wrapLocFstM rnTyClDecl) tycl_decls ; + (rn_inst_decls, src_fvs2) + <- mapFvRn (wrapLocFstM rnSrcInstDecl) inst_decls ; + (rn_rule_decls, src_fvs3) + <- mapFvRn (wrapLocFstM rnHsRuleDecl) rule_decls ; + (rn_foreign_decls, src_fvs4) + <- mapFvRn (wrapLocFstM rnHsForeignDecl) foreign_decls ; + (rn_default_decls, src_fvs5) + <- mapFvRn (wrapLocFstM rnDefaultDecl) default_decls ; + + let { + rn_group = HsGroup { hs_valds = rn_val_decls, + hs_tyclds = rn_tycl_decls, + hs_instds = rn_inst_decls, + hs_fixds = [], + hs_depds = [], + hs_fords = rn_foreign_decls, + hs_defds = rn_default_decls, + hs_ruleds = rn_rule_decls } ; + + other_fvs = plusFVs [src_fvs1, src_fvs2, src_fvs3, + src_fvs4, src_fvs5] ; + src_dus = bind_dus `plusDU` usesOnly other_fvs + -- Note: src_dus will contain *uses* for locally-defined types + -- and classes, but no *defs* for them. (Because rnTyClDecl + -- returns only the uses.) This is a little + -- surprising but it doesn't actually matter at all. + } ; + + traceRn (text "finish rnSrc" <+> ppr rn_group) ; + traceRn (text "finish Dus" <+> ppr src_dus ) ; + tcg_env <- getGblEnv ; + return (tcg_env `addTcgDUs` src_dus, rn_group) + }}} + +rnTyClDecls :: [LTyClDecl RdrName] -> RnM [LTyClDecl Name] +rnTyClDecls tycl_decls = do + (decls', fvs) <- mapFvRn (wrapLocFstM rnTyClDecl) tycl_decls + return decls' + +addTcgDUs :: TcGblEnv -> DefUses -> TcGblEnv +addTcgDUs tcg_env dus = tcg_env { tcg_dus = tcg_dus tcg_env `plusDU` dus } +\end{code} + + %********************************************************* -%* * -\subsection{Value declarations} -%* * +%* * + Source-code fixity declarations +%* * %********************************************************* \begin{code} -rnSourceDecls :: [RdrNameHsDecl] -> RnMS s ([RenamedHsDecl], FreeVars) - -- The decls get reversed, but that's ok - -rnSourceDecls decls - = go emptyFVs [] decls +rnSrcFixityDecls :: [LFixitySig RdrName] -> RnM FixityEnv +rnSrcFixityDecls fix_decls + = getGblEnv `thenM` \ gbl_env -> + foldlM rnFixityDecl (tcg_fix_env gbl_env) + fix_decls `thenM` \ fix_env -> + traceRn (text "fixity env" <+> pprFixEnv fix_env) `thenM_` + returnM fix_env + +rnFixityDecl :: FixityEnv -> LFixitySig RdrName -> RnM FixityEnv +rnFixityDecl fix_env (L loc (FixitySig rdr_name fixity)) + = setSrcSpan loc $ + -- GHC extension: look up both the tycon and data con + -- for con-like things + -- If neither are in scope, report an error; otherwise + -- add both to the fixity env + addLocM lookupTopFixSigNames rdr_name `thenM` \ names -> + if null names then + addLocErr rdr_name unknownNameErr `thenM_` + returnM fix_env + else + foldlM add fix_env names 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' + add fix_env name + = case lookupNameEnv fix_env name of + Just (FixItem _ _ loc') + -> addLocErr rdr_name (dupFixityDecl loc') `thenM_` + returnM fix_env + Nothing -> returnM (extendNameEnv fix_env name fix_item) + where + fix_item = FixItem (nameOccName name) fixity (getLoc rdr_name) + +pprFixEnv :: FixityEnv -> SDoc +pprFixEnv env + = pprWithCommas (\ (FixItem n f _) -> ppr f <+> ppr n) + (nameEnvElts env) + +dupFixityDecl loc rdr_name + = vcat [ptext SLIT("Multiple fixity declarations for") <+> quotes (ppr rdr_name), + ptext SLIT("also at ") <+> ppr loc + ] \end{code} %********************************************************* -%* * -\subsection{Value declarations} -%* * +%* * + Source-code deprecations declarations +%* * %********************************************************* -\begin{code} --- rnDecl does all the work -rnDecl :: RdrNameHsDecl -> RnMS s (RenamedHsDecl, FreeVars) - -rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) -> - returnRn (ValD new_binds, fvs) - +For deprecations, all we do is check that the names are in scope. +It's only imported deprecations, dealt with in RnIfaces, that we +gather them together. -rnDecl (SigD (IfaceSig name ty id_infos loc)) - = pushSrcLocRn loc $ - lookupBndrRn name `thenRn` \ name' -> - rnIfaceType doc_str ty `thenRn` \ ty' -> +\begin{code} +rnSrcDeprecDecls :: [LDeprecDecl RdrName] -> RnM Deprecations +rnSrcDeprecDecls [] + = returnM NoDeprecs - -- 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 - where - doc_str = text "the interface signature for" <+> quotes (ppr name) +rnSrcDeprecDecls decls + = mappM (addLocM rn_deprec) decls `thenM` \ pairs -> + returnM (DeprecSome (mkNameEnv (catMaybes pairs))) + where + rn_deprec (Deprecation rdr_name txt) + = lookupTopBndrRn rdr_name `thenM` \ name -> + returnM (Just (name, (rdrNameOcc rdr_name, txt))) + +checkModDeprec :: Maybe DeprecTxt -> Deprecations +-- Check for a module deprecation; done once at top level +checkModDeprec Nothing = NoDeprecs +checkModDeprec (Just txt) = DeprecAll txt \end{code} %********************************************************* %* * -\subsection{Type declarations} +\subsection{Source code 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 (TyClD (TyData new_or_data context tycon tyvars condecls derivings pragmas src_loc)) - = 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) - where - data_doc = text "the data type declaration for" <+> quotes (ppr tycon) - con_names = map conDeclName condecls - -rnDecl (TyClD (TySynonym name tyvars ty 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) +rnDefaultDecl (DefaultDecl tys) + = mapFvRn (rnHsTypeFVs doc_str) tys `thenM` \ (tys', fvs) -> + returnM (DefaultDecl tys', fvs) 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)) - = pushSrcLocRn src_loc $ - - lookupBndrRn 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' -> + doc_str = text "In a `default' declaration" +\end{code} - -- Tyvars scope over bindings and context - bindTyVarsFV2Rn cls_doc tyvars ( \ clas_tyvar_names tyvars' -> +%********************************************************* +%* * + Bindings +%* * +%********************************************************* - -- Check the superclasses - rnContext cls_doc context `thenRn` \ (context', cxt_fvs) -> +These chaps are here, rather than in TcBinds, so that there +is just one hi-boot file (for RnSource). rnSrcDecls is part +of the loop too, and it must be defined in this module. - -- Check the signatures - let - -- First process the class op sigs, then the fixity sigs. - (op_sigs, non_op_sigs) = partition isClassOpSig sigs - (fix_sigs, non_sigs) = partition isFixitySig non_op_sigs - in - checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_` - mapAndUnzipRn (rn_op cname' clas_tyvar_names) op_sigs `thenRn` \ (sigs', sig_fvs_s) -> - mapRn_ (unknownSigErr) non_sigs `thenRn_` - let - binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ] - in - renameSigs False binders lookupOccRn fix_sigs `thenRn` \ (fixs', fix_fvs) -> +\begin{code} +rnBindGroups :: [HsBindGroup RdrName] -> RnM ([HsBindGroup Name], DefUses) +-- This version assumes that the binders are already in scope +-- It's used only in 'mdo' +rnBindGroups [] + = returnM ([], emptyDUs) +rnBindGroups [HsBindGroup bind sigs _] + = rnBinds NotTopLevel bind sigs +rnBindGroups b@[HsIPBinds bind] + = do addErr (badIpBinds b) + returnM ([], emptyDUs) +rnBindGroups _ + = panic "rnBindGroups" + +rnBindGroupsAndThen + :: [HsBindGroup RdrName] + -> ([HsBindGroup Name] -> RnM (result, FreeVars)) + -> RnM (result, FreeVars) +-- This version (a) assumes that the binding vars are not already in scope +-- (b) removes the binders from the free vars of the thing inside +-- The parser doesn't produce ThenBinds +rnBindGroupsAndThen [] thing_inside + = thing_inside [] +rnBindGroupsAndThen [HsBindGroup bind sigs _] thing_inside + = rnBindsAndThen bind sigs $ \ groups -> thing_inside groups +rnBindGroupsAndThen [HsIPBinds binds] thing_inside + = rnIPBinds binds `thenM` \ (binds',fv_binds) -> + thing_inside [HsIPBinds binds'] `thenM` \ (thing, fvs_thing) -> + returnM (thing, fvs_thing `plusFV` fv_binds) + +rnIPBinds [] = returnM ([], emptyFVs) +rnIPBinds (bind : binds) + = wrapLocFstM rnIPBind bind `thenM` \ (bind', fvBind) -> + rnIPBinds binds `thenM` \ (binds',fvBinds) -> + returnM (bind' : binds', fvBind `plusFV` fvBinds) + +rnIPBind (IPBind n expr) + = newIPNameRn n `thenM` \ name -> + rnLExpr expr `thenM` \ (expr',fvExpr) -> + return (IPBind name expr', fvExpr) + +badIpBinds binds + = hang (ptext SLIT("Implicit-parameter bindings illegal in 'mdo':")) 4 + (ppr binds) +\end{code} - -- Check the methods - checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_` - rnMethodBinds mbinds `thenRn` \ (mbinds', meth_fvs) -> - -- Typechecker is responsible for checking that we only - -- give default-method bindings for things in this class. - -- The renamer *could* check this for class decls, but can't - -- for instance decls. +%********************************************************* +%* * +\subsection{Foreign declarations} +%* * +%********************************************************* - ASSERT(isNoClassPragmas pragmas) - returnRn (TyClD (ClassDecl context' cname' tyvars' (fixs' ++ sigs') mbinds' NoClassPragmas tname' dname' src_loc), - plusFVs sig_fvs_s `plusFV` - fix_fvs `plusFV` - cxt_fvs `plusFV` - meth_fvs - ) - ) - where - cls_doc = text "the declaration for class" <+> ppr cname - sig_doc = text "the signatures for class" <+> ppr cname - 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 `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) +\begin{code} +rnHsForeignDecl (ForeignImport name ty spec isDeprec) + = lookupLocatedTopBndrRn name `thenM` \ name' -> + rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) -> + returnM (ForeignImport name' ty' spec isDeprec, fvs) + +rnHsForeignDecl (ForeignExport name ty spec isDeprec) + = lookupLocatedOccRn name `thenM` \ name' -> + rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) -> + returnM (ForeignExport name' ty' spec isDeprec, fvs ) + -- NB: a foreign export is an *occurrence site* for name, so + -- we add it to the free-variable list. It might, for example, + -- be imported from another module + +fo_decl_msg name = ptext SLIT("In the foreign declaration for") <+> ppr name \end{code} @@ -277,581 +324,406 @@ rnDecl (TyClD (ClassDecl context cname tyvars sigs mbinds pragmas tname dname sr %********************************************************* \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) -> +rnSrcInstDecl (InstDecl inst_ty mbinds uprags) + -- Used for both source and interface file decls + = rnHsSigType (text "an instance decl") inst_ty `thenM` \ inst_ty' -> + + -- Rename the bindings + -- The typechecker (not the renamer) checks that all + -- the bindings are for the right class let - inst_tyvars = case inst_ty' of - HsForAllTy (Just inst_tyvars) _ _ -> inst_tyvars - other -> [] + meth_doc = text "In the bindings in an instance declaration" + meth_names = collectHsBindLocatedBinders mbinds + (inst_tyvars, _, cls,_) = splitHsInstDeclTy (unLoc inst_ty') + in + checkDupNames meth_doc meth_names `thenM_` + extendTyVarEnvForMethodBinds inst_tyvars ( -- (Slightly strangely) the forall-d tyvars scope over -- the method bindings too - in - extendTyVarEnvFVRn inst_tyvars $ - - -- Rename the bindings - -- NB meth_names can be qualified! - checkDupNames meth_doc meth_names `thenRn_` - rnMethodBinds mbinds `thenRn` \ (mbinds', meth_fvs) -> - let - binders = mkNameSet (map fst (bagToList (collectMonoBinders mbinds'))) - - -- Delete sigs (&report) sigs that aren't allowed inside an - -- instance decl: + rnMethodBinds cls [] mbinds + ) `thenM` \ (mbinds', meth_fvs) -> + -- 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. -- - -- + type signatures - -- + fixity decls - -- - (ok_sigs, not_ok_idecl_sigs) = partition okInInstDecl uprags - - okInInstDecl (FixSig _) = False - okInInstDecl (Sig _ _ _) = False - okInInstDecl _ = True - + -- But the (unqualified) method names are in scope + let + binders = collectHsBindBinders mbinds' in - -- You can't have fixity decls & type signatures - -- within an instance declaration. - mapRn_ unknownSigErr not_ok_idecl_sigs `thenRn_` - renameSigs False binders lookupOccRn ok_sigs `thenRn` \ (new_uprags, prag_fvs) -> - mkDFunName inst_ty' maybe_dfun src_loc `thenRn` \ dfun_name -> - addOccurrenceName dfun_name `thenRn_` - -- The dfun is not optional, because we use its version number - -- to identify the version of the instance declaration - - -- The typechecker checks that all the bindings are for the right class. - returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags (Just dfun_name) src_loc), - inst_fvs `plusFV` meth_fvs `plusFV` prag_fvs) - where - meth_doc = text "the bindings in an instance declaration" - meth_names = bagToList (collectMonoBinders mbinds) -\end{code} - -%********************************************************* -%* * -\subsection{Default declarations} -%* * -%********************************************************* + bindLocalNames binders (renameSigs uprags) `thenM` \ uprags' -> + checkSigs (okInstDclSig (mkNameSet binders)) uprags' `thenM_` -\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" + returnM (InstDecl inst_ty' mbinds' uprags', + meth_fvs `plusFV` hsSigsFVs uprags' + `plusFV` extractHsTyNames inst_ty') \end{code} -%********************************************************* -%* * -\subsection{Foreign declarations} -%* * -%********************************************************* +For the method bindings in class and instance decls, we extend the +type variable environment iff -fglasgow-exts \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 - +extendTyVarEnvForMethodBinds tyvars thing_inside + = doptM Opt_GlasgowExts `thenM` \ opt_GlasgowExts -> + if opt_GlasgowExts then + extendTyVarEnvFVRn (map hsLTyVarName tyvars) thing_inside + else + thing_inside \end{code} + %********************************************************* %* * -\subsection{Support code for type/data declarations} +\subsection{Rules} %* * %********************************************************* \begin{code} -rnDerivs :: Maybe [RdrName] -> RnMS s (Maybe [Name], FreeVars) +rnHsRuleDecl (HsRule rule_name act vars lhs rhs) + = bindPatSigTyVarsFV (collectRuleBndrSigTys vars) $ -rnDerivs Nothing -- derivs not specified - = returnRn (Nothing, emptyFVs) + bindLocatedLocalsFV doc (map get_var vars) $ \ ids -> + mapFvRn rn_var (vars `zip` ids) `thenM` \ (vars', fv_vars) -> -rnDerivs (Just ds) - = mapRn rn_deriv ds `thenRn` \ derivs -> - returnRn (Just derivs, foldl addOneFV emptyFVs derivs) + rnLExpr lhs `thenM` \ (lhs', fv_lhs) -> + rnLExpr rhs `thenM` \ (rhs', fv_rhs) -> + let + mb_bad = validRuleLhs ids lhs' + in + checkErr (isNothing mb_bad) + (badRuleLhsErr rule_name lhs' mb_bad) `thenM_` + let + bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)] + in + mappM (addErr . badRuleVar rule_name) bad_vars `thenM_` + returnM (HsRule rule_name act vars' lhs' rhs', + fv_vars `plusFV` fv_lhs `plusFV` fv_rhs) 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 + doc = text "In the transformation rule" <+> ftext rule_name + + get_var (RuleBndr v) = v + get_var (RuleBndrSig v _) = v + + rn_var (RuleBndr (L loc v), id) + = returnM (RuleBndr (L loc id), emptyFVs) + rn_var (RuleBndrSig (L loc v) t, id) + = rnHsTypeFVs doc t `thenM` \ (t', fvs) -> + returnM (RuleBndrSig (L loc id) t', fvs) +\end{code} - Just occs -> mapRn_ lookupImplicitOccRn occs `thenRn_` - returnRn clas_name +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. We also restrict the form of the LHS so +that it may be plausibly matched. Basically you only get to write ordinary +applications. (E.g. a case expression is not allowed: too elaborate.) -\end{code} +NB: if you add new cases here, make sure you add new ones to TcRule.ruleLhsTvs \begin{code} -conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc) -conDeclName (ConDecl n _ _ _ l) = (n,l) - -rnConDecl :: RdrNameConDecl -> RnMS s (RenamedConDecl, FreeVars) -rnConDecl (ConDecl name 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) +validRuleLhs :: [Name] -> LHsExpr Name -> Maybe (HsExpr Name) +-- Nothing => OK +-- Just e => Not ok, and e is the offending expression +validRuleLhs foralls lhs + = checkl lhs where - doc = text "the definition of data constructor" <+> quotes (ppr name) + checkl (L loc e) = check e -rnConDetails doc locn (VanillaCon tys) - = mapAndUnzipRn (rnBangTy doc) tys `thenRn` \ (new_tys, fvs_s) -> - returnRn (VanillaCon new_tys, plusFVs fvs_s) + check (OpApp e1 op _ e2) = checkl op `seqMaybe` checkl_e e1 `seqMaybe` checkl_e e2 + check (HsApp e1 e2) = checkl e1 `seqMaybe` checkl_e e2 + check (HsVar v) | v `notElem` foralls = Nothing + check other = Just other -- Failure -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) - -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) - where - field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds] + checkl_e (L loc e) = check_e e -rnField doc (names, ty) - = mapRn lookupBndrRn names `thenRn` \ new_names -> - rnBangTy doc ty `thenRn` \ (new_ty, fvs) -> - returnRn ((new_names, new_ty), fvs) + check_e (HsVar v) = Nothing + check_e (HsPar e) = checkl_e e + check_e (HsLit e) = Nothing + check_e (HsOverLit e) = Nothing -rnBangTy doc (Banged ty) - = rnHsType doc ty `thenRn` \ (new_ty, fvs) -> - returnRn (Banged new_ty, fvs) + check_e (OpApp e1 op _ e2) = checkl_e e1 `seqMaybe` checkl_e op `seqMaybe` checkl_e e2 + check_e (HsApp e1 e2) = checkl_e e1 `seqMaybe` checkl_e e2 + check_e (NegApp e _) = checkl_e e + check_e (ExplicitList _ es) = checkl_es es + check_e (ExplicitTuple es _) = checkl_es es + check_e other = Just other -- Fails -rnBangTy doc (Unbanged ty) - = rnHsType doc ty `thenRn` \ (new_ty, fvs) -> - returnRn (Unbanged new_ty, fvs) + checkl_es es = foldr (seqMaybe . checkl_e) Nothing es -rnBangTy doc (Unpacked ty) - = rnHsType doc ty `thenRn` \ (new_ty, fvs) -> - returnRn (Unpacked new_ty, fvs) - --- This data decl will parse OK --- data T = a Int --- treating "a" as the constructor. --- It is really hard to make the parser spot this malformation. --- So the renamer has to check that the constructor is legal --- --- We can get an operator as the constructor, even in the prefix form: --- data T = :% Int Int --- from interface files, which always print in prefix form +badRuleLhsErr name lhs (Just bad_e) + = sep [ptext SLIT("Rule") <+> ftext name <> colon, + nest 4 (vcat [ptext SLIT("Illegal expression:") <+> ppr bad_e, + ptext SLIT("in left-hand side:") <+> ppr lhs])] + $$ + ptext SLIT("LHS must be of form (f e1 .. en) where f is not forall'd") -checkConName name - = checkRn (isRdrDataCon name) - (badDataCon name) +badRuleVar name var + = sep [ptext SLIT("Rule") <+> doubleQuotes (ftext name) <> colon, + ptext SLIT("Forall'd variable") <+> quotes (ppr var) <+> + ptext SLIT("does not appear on left hand side")] \end{code} %********************************************************* %* * -\subsection{Naming a dfun} +\subsection{Type, class and iface sig declarations} %* * %********************************************************* -Make a name for the dict fun for an instance decl +@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} -mkDFunName :: RenamedHsType -- Instance type - -> Maybe RdrName -- Dfun thing from decl; Nothing <=> source - -> SrcLoc - -> RnMS s Name +rnTyClDecl (ForeignType {tcdLName = name, tcdFoType = fo_type, tcdExtName = ext_name}) + = lookupLocatedTopBndrRn name `thenM` \ name' -> + returnM (ForeignType {tcdLName = name', tcdFoType = fo_type, tcdExtName = ext_name}, + emptyFVs) + +rnTyClDecl (TyData {tcdND = new_or_data, tcdCtxt = context, tcdLName = tycon, + tcdTyVars = tyvars, tcdCons = condecls, + tcdKindSig = sig, tcdDerivs = derivs}) + | is_vanilla -- Normal Haskell data type decl + = ASSERT( isNothing sig ) -- In normal H98 form, kind signature on the + -- data type is syntactically illegal + bindTyVarsRn data_doc tyvars $ \ tyvars' -> + do { tycon' <- lookupLocatedTopBndrRn tycon + ; context' <- rnContext data_doc context + ; (derivs', deriv_fvs) <- rn_derivs derivs + ; checkDupNames data_doc con_names + ; condecls' <- rnConDecls (unLoc tycon') condecls + ; returnM (TyData {tcdND = new_or_data, tcdCtxt = context', tcdLName = tycon', + tcdTyVars = tyvars', tcdKindSig = Nothing, tcdCons = condecls', + tcdDerivs = derivs'}, + delFVs (map hsLTyVarName tyvars') $ + extractHsCtxtTyNames context' `plusFV` + plusFVs (map conDeclFVs condecls') `plusFV` + deriv_fvs) } + + | otherwise -- GADT + = ASSERT( null (unLoc context) ) + do { tycon' <- lookupLocatedTopBndrRn tycon + ; tyvars' <- bindTyVarsRn data_doc tyvars + (\ tyvars' -> return tyvars') + -- For GADTs, the type variables in the declaration + -- do not scope over the constructor signatures + -- data T a where { T1 :: forall b. b-> b } + ; (derivs', deriv_fvs) <- rn_derivs derivs + ; checkDupNames data_doc con_names + ; condecls' <- rnConDecls (unLoc tycon') condecls + ; returnM (TyData {tcdND = new_or_data, tcdCtxt = noLoc [], tcdLName = tycon', + tcdTyVars = tyvars', tcdCons = condecls', tcdKindSig = sig, + tcdDerivs = derivs'}, + plusFVs (map conDeclFVs condecls') `plusFV` deriv_fvs) } -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} + is_vanilla = case condecls of -- Yuk + [] -> True + L _ (ConDecl {}) : _ -> True + other -> False + data_doc = text "In the data type declaration for" <+> quotes (ppr tycon) + con_names = map con_names_helper condecls -%********************************************************* -%* * -\subsection{Support code to rename types} -%* * -%********************************************************* + con_names_helper (L _ (ConDecl n _ _ _)) = n + con_names_helper (L _ (GadtDecl n _)) = n -\begin{code} -rnHsSigType :: SDoc -> RdrNameHsType -> RnMS s (RenamedHsType, FreeVars) - -- rnHsSigType is used for source-language type signatures, - -- which use *implicit* universal quantification. -rnHsSigType doc_str ty - = rnHsType (text "the type signature for" <+> doc_str) ty + rn_derivs Nothing = returnM (Nothing, emptyFVs) + rn_derivs (Just ds) = rnLHsTypes data_doc ds `thenM` \ ds' -> + returnM (Just ds', extractHsTyNames_s ds') -rnIfaceType :: SDoc -> RdrNameHsType -> RnMS s RenamedHsType -rnIfaceType doc ty - = rnHsType doc ty `thenRn` \ (ty,_) -> - returnRn ty - - -rnForAll doc forall_tyvars ctxt ty - = bindTyVarsFVRn doc forall_tyvars $ \ new_tyvars -> - rnContext doc ctxt `thenRn` \ (new_ctxt, cxt_fvs) -> - rnHsType doc ty `thenRn` \ (new_ty, ty_fvs) -> - returnRn (mkHsForAllTy new_tyvars new_ctxt new_ty, - cxt_fvs `plusFV` ty_fvs) - --- Check that each constraint mentions at least one of the forall'd type variables --- Since the forall'd type variables are a subset of the free tyvars --- of the tau-type part, this guarantees that every constraint mentions --- at least one of the free tyvars in ty -checkConstraints explicit_forall doc forall_tyvars ctxt ty - = mapRn check ctxt `thenRn` \ maybe_ctxt' -> - returnRn (catMaybes maybe_ctxt') - -- Remove problem ones, to avoid duplicate error message. - where - check ct@(_,tys) - | forall_mentioned = returnRn (Just ct) - | otherwise = addErrRn (ctxtErr explicit_forall doc forall_tyvars ct ty) `thenRn_` - returnRn Nothing - where - forall_mentioned = foldr ((||) . any (`elem` forall_tyvars) . extractHsTyVars) - False - tys - - -rnHsType :: SDoc -> RdrNameHsType -> RnMS s (RenamedHsType, FreeVars) - -rnHsType doc (HsForAllTy Nothing ctxt ty) - -- From source code (no kinds on tyvars) - -- Given the signature C => T we universally quantify - -- over FV(T) \ {in-scope-tyvars} - = getLocalNameEnv `thenRn` \ name_env -> - let - mentioned_tyvars = extractHsTyVars ty - forall_tyvars = filter (not . (`elemFM` name_env)) mentioned_tyvars - in - checkConstraints False doc forall_tyvars ctxt ty `thenRn` \ ctxt' -> - rnForAll doc (map UserTyVar forall_tyvars) ctxt' ty - -rnHsType doc (HsForAllTy (Just forall_tyvars) ctxt ty) - -- Explicit quantification. - -- Check that the forall'd tyvars are a subset of the - -- free tyvars in the tau-type part - -- That's only a warning... unless the tyvar is constrained by a - -- context in which case it's an error - = let - mentioned_tyvars = extractHsTyVars ty - constrained_tyvars = [tv | (_,tys) <- ctxt, - ty <- tys, - tv <- extractHsTyVars ty] - dubious_guys = filter (`notElem` mentioned_tyvars) forall_tyvar_names - (bad_guys, warn_guys) = partition (`elem` constrained_tyvars) dubious_guys - forall_tyvar_names = map getTyVarName forall_tyvars - in - mapRn_ (forAllErr doc ty) bad_guys `thenRn_` - mapRn_ (forAllWarn doc ty) warn_guys `thenRn_` - checkConstraints True doc forall_tyvar_names ctxt ty `thenRn` \ ctxt' -> - rnForAll doc forall_tyvars ctxt' ty - -rnHsType doc (MonoTyVar tyvar) - = lookupOccRn tyvar `thenRn` \ tyvar' -> - returnRn (MonoTyVar tyvar', 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) +rnTyClDecl (TySynonym {tcdLName = name, tcdTyVars = tyvars, tcdSynRhs = ty}) + = lookupLocatedTopBndrRn name `thenM` \ name' -> + bindTyVarsRn syn_doc tyvars $ \ tyvars' -> + rnHsTypeFVs syn_doc ty `thenM` \ (ty', fvs) -> + returnM (TySynonym {tcdLName = name', tcdTyVars = tyvars', + tcdSynRhs = ty'}, + delFVs (map hsLTyVarName tyvars') fvs) where - tup_con_name = tupleTyCon_name boxed (length tys) + syn_doc = text "In the declaration for type synonym" <+> quotes (ppr name) -rnHsType doc (MonoTyApp ty1 ty2) - = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) -> - rnHsType doc ty2 `thenRn` \ (ty2', fvs2) -> - returnRn (MonoTyApp ty1' ty2', fvs1 `plusFV` fvs2) +rnTyClDecl (ClassDecl {tcdCtxt = context, tcdLName = cname, + tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs, + tcdMeths = mbinds}) + = lookupLocatedTopBndrRn cname `thenM` \ cname' -> -rnHsType doc (MonoDictTy clas tys) - = lookupOccRn clas `thenRn` \ clas' -> - rnHsTypes doc tys `thenRn` \ (tys', fvs) -> - returnRn (MonoDictTy clas' tys', fvs `addOneFV` clas') + -- Tyvars scope over superclass context and method signatures + bindTyVarsRn cls_doc tyvars ( \ tyvars' -> + rnContext cls_doc context `thenM` \ context' -> + rnFds cls_doc fds `thenM` \ fds' -> + renameSigs sigs `thenM` \ sigs' -> + returnM (tyvars', context', fds', sigs') + ) `thenM` \ (tyvars', context', fds', sigs') -> -rnHsType doc (MonoUsgTy usg ty) - = rnHsType doc ty `thenRn` \ (ty', fvs) -> - returnRn (MonoUsgTy usg ty', fvs) - -rnHsTypes doc tys - = mapAndUnzipRn (rnHsType doc) tys `thenRn` \ (tys, fvs_s) -> - returnRn (tys, plusFVs fvs_s) -\end{code} - - -\begin{code} -rnContext :: SDoc -> RdrNameContext -> RnMS s (RenamedContext, FreeVars) - -rnContext doc ctxt - = mapAndUnzipRn rn_ctxt ctxt `thenRn` \ (theta, fvs_s) -> + -- Check the signatures + -- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs). let - (_, dup_asserts) = removeDups cmp_assert theta + sig_rdr_names_w_locs = [op | L _ (Sig op _) <- sigs] in - -- Check for duplicate assertions - -- If this isn't an error, then it ought to be: - mapRn_ (addWarnRn . dupClassAssertWarn theta) dup_asserts `thenRn_` + checkDupNames sig_doc sig_rdr_names_w_locs `thenM_` + checkSigs okClsDclSig sigs' `thenM_` + -- 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 (theta, plusFVs fvs_s) + -- 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. + extendTyVarEnvForMethodBinds tyvars' ( + getLocalRdrEnv `thenM` \ name_env -> + let + meth_rdr_names_w_locs = collectHsBindLocatedBinders mbinds + gen_rdr_tyvars_w_locs = + [ tv | tv <- extractGenericPatTyVars mbinds, + not (unLoc tv `elemLocalRdrEnv` name_env) ] + in + checkDupNames meth_doc meth_rdr_names_w_locs `thenM_` + newLocalsRn gen_rdr_tyvars_w_locs `thenM` \ gen_tyvars -> + rnMethodBinds (unLoc cname') gen_tyvars mbinds + ) `thenM` \ (mbinds', meth_fvs) -> + + returnM (ClassDecl { tcdCtxt = context', tcdLName = cname', tcdTyVars = tyvars', + tcdFDs = fds', tcdSigs = sigs', tcdMeths = mbinds'}, + delFVs (map hsLTyVarName tyvars') $ + extractHsCtxtTyNames context' `plusFV` + plusFVs (map extractFunDepNames (map unLoc fds')) `plusFV` + hsSigsFVs sigs' `plusFV` + meth_fvs) where - rn_ctxt (clas, tys) - = lookupOccRn clas `thenRn` \ clas_name -> - rnHsTypes doc tys `thenRn` \ (tys', fvs) -> - returnRn ((clas_name, tys'), fvs `addOneFV` clas_name) - - cmp_assert (c1,tys1) (c2,tys2) - = (c1 `compare` c2) `thenCmp` (cmpHsTypes compare tys1 tys2) + meth_doc = text "In the default-methods for class" <+> ppr cname + cls_doc = text "In the declaration for class" <+> ppr cname + sig_doc = text "In the signatures for class" <+> ppr cname \end{code} - %********************************************************* %* * -\subsection{IdInfo} +\subsection{Support code for type/data declarations} %* * %********************************************************* \begin{code} -rnIdInfo (HsStrictness str) = returnRn (HsStrictness str) - -rnIdInfo (HsWorker worker cons) - -- The sole purpose of the "cons" field is so that we can mark the - -- constructors needed to build the wrapper as "needed", so that their - -- data type decl will be slurped in. After that their usefulness is - -- o'er, so we just put in the empty list. - = lookupOccRn worker `thenRn` \ worker' -> - mapRn lookupOccRn cons `thenRn_` - returnRn (HsWorker worker' []) - -rnIdInfo (HsUnfold inline (Just expr)) = rnCoreExpr expr `thenRn` \ expr' -> - returnRn (HsUnfold inline (Just expr')) -rnIdInfo (HsUnfold inline Nothing) = returnRn (HsUnfold inline Nothing) -rnIdInfo (HsArity arity) = returnRn (HsArity arity) -rnIdInfo (HsUpdate update) = returnRn (HsUpdate update) -rnIdInfo (HsNoCafRefs) = returnRn (HsNoCafRefs) -rnIdInfo (HsCprInfo cpr_info) = returnRn (HsCprInfo cpr_info) -rnIdInfo (HsSpecialise tyvars tys expr) - = bindTyVarsRn doc tyvars $ \ tyvars' -> - rnCoreExpr expr `thenRn` \ expr' -> - mapRn (rnIfaceType doc) tys `thenRn` \ tys' -> - returnRn (HsSpecialise tyvars' tys' expr') +rnConDecls :: Name -> [LConDecl RdrName] -> RnM [LConDecl Name] +rnConDecls tycon condecls + = -- Check that there's at least one condecl, + -- or else we're reading an interface file, or -fglasgow-exts + (if null condecls then + doptM Opt_GlasgowExts `thenM` \ glaExts -> + checkErr glaExts (emptyConDeclsErr tycon) + else returnM () + ) `thenM_` + mappM (wrapLocM rnConDecl) condecls + +rnConDecl :: ConDecl RdrName -> RnM (ConDecl Name) +rnConDecl (ConDecl name tvs cxt details) + = addLocM checkConName name `thenM_` + lookupLocatedTopBndrRn name `thenM` \ new_name -> + + bindTyVarsRn doc tvs $ \ new_tyvars -> + rnContext doc cxt `thenM` \ new_context -> + rnConDetails doc details `thenM` \ new_details -> + returnM (ConDecl new_name new_tyvars new_context new_details) where - doc = text "Specialise in interface pragma" -\end{code} - -UfCore expressions. + doc = text "In the definition of data constructor" <+> quotes (ppr name) -\begin{code} -rnCoreExpr (UfType ty) - = rnIfaceType (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 (UfTuple con args) - = lookupOccRn con `thenRn` \ con' -> - mapRn rnCoreExpr args `thenRn` \ args' -> - returnRn (UfTuple con' args') - -rnCoreExpr (UfApp fun arg) - = rnCoreExpr fun `thenRn` \ fun' -> - rnCoreExpr arg `thenRn` \ arg' -> - returnRn (UfApp fun' arg') - -rnCoreExpr (UfCase scrut bndr alts) - = rnCoreExpr scrut `thenRn` \ scrut' -> - bindLocalsRn "a UfCase" [bndr] $ \ [bndr'] -> - mapRn rnCoreAlt alts `thenRn` \ alts' -> - returnRn (UfCase scrut' bndr' alts') - -rnCoreExpr (UfNote note expr) - = rnNote note `thenRn` \ note' -> - rnCoreExpr expr `thenRn` \ expr' -> - returnRn (UfNote note' expr') - -rnCoreExpr (UfLam bndr body) - = rnCoreBndr bndr $ \ bndr' -> - rnCoreExpr body `thenRn` \ body' -> - returnRn (UfLam bndr' body') - -rnCoreExpr (UfLet (UfNonRec bndr rhs) body) - = rnCoreExpr rhs `thenRn` \ rhs' -> - rnCoreBndr bndr $ \ bndr' -> - rnCoreExpr body `thenRn` \ body' -> - returnRn (UfLet (UfNonRec bndr' rhs') body') - -rnCoreExpr (UfLet (UfRec pairs) body) - = rnCoreBndrs bndrs $ \ bndrs' -> - mapRn rnCoreExpr rhss `thenRn` \ rhss' -> - rnCoreExpr body `thenRn` \ body' -> - returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body') - where - (bndrs, rhss) = unzip pairs -\end{code} - -\begin{code} -rnCoreBndr (UfValBinder name ty) thing_inside - = rnIfaceType (text str) ty `thenRn` \ ty' -> - bindLocalsRn str [name] $ \ [name'] -> - thing_inside (UfValBinder name' ty') +rnConDecl (GadtDecl name ty) + = addLocM checkConName name `thenM_` + lookupLocatedTopBndrRn name `thenM` \ new_name -> + rnHsSigType doc ty `thenM` \ new_ty -> + returnM (GadtDecl new_name new_ty) where - str = "unfolding id" - -rnCoreBndr (UfTyBinder name kind) thing_inside - = bindLocalsRn "an unfolding tyvar" [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 -\end{code} - -\begin{code} -rnCoreAlt (con, bndrs, rhs) - = rnUfCon con `thenRn` \ con' -> - bindLocalsRn "an unfolding alt" bndrs $ \ bndrs' -> - rnCoreExpr rhs `thenRn` \ rhs' -> - returnRn (con', bndrs', rhs') - + doc = text "In the definition of data constructor" <+> quotes (ppr name) -rnNote (UfCoerce ty) - = rnIfaceType (text "unfolding coerce") ty `thenRn` \ ty' -> - returnRn (UfCoerce ty') +rnConDetails doc (PrefixCon tys) + = mappM (rnLHsType doc) tys `thenM` \ new_tys -> + returnM (PrefixCon new_tys) -rnNote (UfSCC cc) = returnRn (UfSCC cc) -rnNote UfInlineCall = returnRn UfInlineCall +rnConDetails doc (InfixCon ty1 ty2) + = rnLHsType doc ty1 `thenM` \ new_ty1 -> + rnLHsType doc ty2 `thenM` \ new_ty2 -> + returnM (InfixCon new_ty1 new_ty2) +rnConDetails doc (RecCon fields) + = checkDupNames doc field_names `thenM_` + mappM (rnField doc) fields `thenM` \ new_fields -> + returnM (RecCon new_fields) + where + field_names = [fld | (fld, _) <- fields] -rnUfCon UfDefault - = returnRn UfDefault - -rnUfCon (UfDataCon con) - = lookupOccRn con `thenRn` \ con' -> - returnRn (UfDataCon con') +rnField doc (name, ty) + = lookupLocatedTopBndrRn name `thenM` \ new_name -> + rnLHsType doc ty `thenM` \ new_ty -> + returnM (new_name, new_ty) -rnUfCon (UfLitCon lit) - = returnRn (UfLitCon lit) +-- This data decl will parse OK +-- data T = a Int +-- treating "a" as the constructor. +-- It is really hard to make the parser spot this malformation. +-- So the renamer has to check that the constructor is legal +-- +-- We can get an operator as the constructor, even in the prefix form: +-- data T = :% Int Int +-- from interface files, which always print in prefix form -rnUfCon (UfLitLitCon lit ty) - = rnIfaceType (text "litlit") ty `thenRn` \ ty' -> - returnRn (UfLitLitCon lit ty') +checkConName name = checkErr (isRdrDataCon name) (badDataCon name) -rnUfCon (UfPrimOp op) - = lookupOccRn op `thenRn` \ op' -> - returnRn (UfPrimOp op') +badDataCon name + = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)] -rnUfCon (UfCCallOp str is_dyn casm gc) - = returnRn (UfCCallOp str is_dyn casm gc) +emptyConDeclsErr tycon + = sep [quotes (ppr tycon) <+> ptext SLIT("has no constructors"), + nest 4 (ptext SLIT("(-fglasgow-exts permits this)"))] \end{code} + %********************************************************* %* * -\subsection{Errors} +\subsection{Support code to rename types} %* * %********************************************************* \begin{code} -derivingNonStdClassErr clas - = hsep [ptext SLIT("non-standard class"), ppr clas, ptext SLIT("in deriving clause")] +rnFds :: SDoc -> [Located (FunDep RdrName)] -> RnM [Located (FunDep Name)] -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) +rnFds doc fds + = mappM (wrapLocM rn_fds) fds + where + rn_fds (tys1, tys2) + = rnHsTyVars doc tys1 `thenM` \ tys1' -> + rnHsTyVars doc tys2 `thenM` \ tys2' -> + returnM (tys1', tys2') -dupClassAssertWarn ctxt (assertion : dups) - = sep [hsep [ptext SLIT("Duplicate class assertion"), - quotes (pprClassAssertion assertion), - ptext SLIT("in the context:")], - nest 4 (pprContext ctxt <+> ptext SLIT("..."))] +rnHsTyVars doc tvs = mappM (rnHsTyvar doc) tvs +rnHsTyvar doc tyvar = lookupOccRn tyvar +\end{code} -badDataCon name - = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)] -forAllWarn doc ty tyvar - | not opt_WarnUnusedMatches = returnRn () - | otherwise - = addWarnRn ( - sep [ptext SLIT("The universally quantified type variable") <+> quotes (ppr tyvar), - nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))] - $$ - (ptext SLIT("In") <+> doc)) - -forAllErr doc ty tyvar - = addErrRn ( - sep [ptext SLIT("The constrained type variable") <+> quotes (ppr tyvar), - nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))] - $$ - (ptext SLIT("In") <+> doc)) - -ctxtErr explicit_forall doc tyvars constraint ty - = sep [ptext SLIT("The constraint") <+> quotes (pprClassAssertion constraint) <+> - ptext SLIT("does not mention any of"), - if explicit_forall then - nest 4 (ptext SLIT("the universally quantified type variables") <+> braces (interpp'SP tyvars)) - else - nest 4 (ptext SLIT("the type variables in the type") <+> quotes (ppr ty)) - ] - $$ - (ptext SLIT("In") <+> doc) +%********************************************************* +%* * + Splices +%* * +%********************************************************* + +\begin{code} +rnSplice :: HsSplice RdrName -> RnM (HsSplice Name, FreeVars) +rnSplice (HsSplice n expr) + = checkTH expr "splice" `thenM_` + getSrcSpanM `thenM` \ loc -> + newLocalsRn [L loc n] `thenM` \ [n'] -> + rnLExpr expr `thenM` \ (expr', fvs) -> + returnM (HsSplice n' expr', fvs) \end{code}