X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnSource.lhs;h=d8c9a5be5be86012e93ea231dd1fdf86a681ea4a;hb=9af77fa423926fbda946b31e174173d0ec5ebac8;hp=fbcae1c48101d61a5b416d2d241da35de0e2fd22;hpb=791ce2a522626b1332617e9af79e4909dd9bdb2b;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnSource.lhs b/ghc/compiler/rename/RnSource.lhs index fbcae1c..d8c9a5b 100644 --- a/ghc/compiler/rename/RnSource.lhs +++ b/ghc/compiler/rename/RnSource.lhs @@ -4,260 +4,306 @@ \section[RnSource]{Main pass of renamer} \begin{code} -module RnSource ( rnIfaceDecl, rnSourceDecls, rnHsType, rnHsSigType ) where +module RnSource ( + rnSrcDecls, rnExtCoreDecls, checkModDeprec, + rnTyClDecl, rnIfaceRuleDecl, rnInstDecl, + rnBinds, rnStats, + ) 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, elemRdrEnv ) +import RdrHsSyn ( RdrNameConDecl, RdrNameTyClDecl, RdrNameHsDecl, + RdrNameDeprecation, RdrNameFixitySig, + RdrNameHsBinds, + extractGenericPatTyVars ) import RnHsSyn import HsCore -import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs ) -import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn, - lookupImplicitOccRn, addImplicitOccRn, - bindLocalsRn, - bindTyVarsFVRn, bindTyVarsFV2Rn, extendTyVarEnvFVRn, - checkDupOrQualNames, checkDupNames, - newLocallyDefinedGlobalName, newImportedGlobalName, - newImportedGlobalFromRdrName, - newDFunName, - FreeVars, emptyFVs, plusFV, plusFVs, unitFV, addOneFV - ) -import RnMonad - -import Name ( Name, OccName, - ExportFlag(..), Provenance(..), - nameOccName, NamedThing(..), - mkDefaultMethodOcc, mkDFunOcc +import RnNames ( importsFromLocalDecls ) +import RnTypes ( rnHsType, rnHsSigType, rnHsTypeFVs, rnContext ) + +import RnBinds ( rnTopMonoBinds, rnMonoBinds, rnMethodBinds, + renameSigs, renameSigsFVs ) +import RnEnv ( lookupTopBndrRn, lookupOccRn, lookupSysBndr, + newLocalsRn, lookupGlobalOccRn, + bindLocalsFVRn, bindPatSigTyVars, + bindTyVarsRn, extendTyVarEnvFVRn, + bindCoreLocalRn, bindCoreLocalsRn, bindLocalNames, + checkDupOrQualNames, checkDupNames, mapFvRn, + lookupTopSrcBndr_maybe, lookupTopSrcBndr, + dataTcOccs, unknownNameErr, + plusGlobalRdrEnv ) +import TcRnMonad + +import BasicTypes ( FixitySig(..) ) +import HscTypes ( ExternalPackageState(..), FixityEnv, + Deprecations(..), plusDeprecs ) +import Module ( moduleEnvElts ) +import Class ( FunDep, DefMeth (..) ) +import TyCon ( DataConDetails(..), visibleDataCons ) +import Name ( Name ) 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 NameEnv +import ErrUtils ( dumpIfSet ) +import PrelNames ( newStablePtrName, bindIOName, returnIOName ) import List ( partition ) +import Bag ( bagToList ) 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 CmdLineOpts ( DynFlag(..) ) + -- Warn of unused for-all'd tyvars +import Maybes ( maybeToBool ) +import Maybe ( maybe, catMaybes ) \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} -%* * -%********************************************************* - \begin{code} -rnSourceDecls :: [RdrNameHsDecl] -> RnMS s ([RenamedHsDecl], FreeVars) - -- The decls get reversed, but that's ok - -rnSourceDecls decls +rnSrcDecls :: [RdrNameHsDecl] -> RnM (TcGblEnv, [RenamedHsDecl], FreeVars) + +rnSrcDecls decls + = do { (rdr_env, imports) <- importsFromLocalDecls decls ; + updGblEnv (\gbl -> gbl { tcg_rdr_env = rdr_env `plusGlobalRdrEnv` + tcg_rdr_env gbl, + tcg_imports = imports `plusImportAvails` + tcg_imports gbl }) + $ do { + + -- Deal with deprecations (returns only the extra deprecations) + deprecs <- rnSrcDeprecDecls [d | DeprecD d <- 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 decls ; + updGblEnv (\gbl -> gbl { tcg_fix_env = fix_env }) + $ do { + + -- Rename remaining declarations + (rn_src_decls, src_fvs) <- rn_src_decls decls ; + + tcg_env <- getGblEnv ; + return (tcg_env, rn_src_decls, src_fvs) + }}}} + +rnExtCoreDecls :: [RdrNameHsDecl] -> RnM ([RenamedHsDecl], FreeVars) +rnExtCoreDecls decls = rn_src_decls decls + +rn_src_decls decls -- Declarartions get reversed, but no matter = go emptyFVs [] decls where - -- Fixity decls have been dealt with already; ignore them - go fvs ds' [] = returnRn (ds', fvs) - go fvs ds' (FixD _:ds) = go fvs ds' ds - go fvs ds' (d:ds) = rnDecl d `thenRn` \(d', fvs') -> - go (fvs `plusFV` fvs') (d':ds') ds - -rnIfaceDecl :: RdrNameHsDecl -> RnMS s RenamedHsDecl -rnIfaceDecl d - = rnDecl d `thenRn` \ (d', fvs) -> - returnRn d' + -- Fixity and deprecations have been dealt with already; ignore them + go fvs ds' [] = returnM (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) = rnSrcDecl d `thenM` \(d', fvs') -> + go (fvs `plusFV` fvs') (d':ds') ds \end{code} %********************************************************* -%* * -\subsection{Value declarations} -%* * +%* * + Source-code fixity declarations +%* * %********************************************************* \begin{code} --- rnDecl does all the work -rnDecl :: RdrNameHsDecl -> RnMS s (RenamedHsDecl, FreeVars) +rnSrcFixityDecls :: [RdrNameHsDecl] -> TcRn m FixityEnv +rnSrcFixityDecls decls + = getGblEnv `thenM` \ gbl_env -> + foldlM rnFixityDecl (tcg_fix_env gbl_env) + fix_decls `thenM` \ fix_env -> + traceRn (text "fixity env" <+> ppr fix_env) `thenM_` + returnM fix_env + where + fix_decls = foldr get_fix_sigs [] decls + + -- Get fixities from top level decls, and from class decl sigs too + get_fix_sigs (FixD fix) acc = fix:acc + get_fix_sigs (TyClD (ClassDecl { tcdSigs = sigs})) acc + = [sig | FixSig sig <- sigs] ++ acc + get_fix_sigs other_decl acc = acc + +rnFixityDecl :: FixityEnv -> RdrNameFixitySig -> TcRn m FixityEnv +rnFixityDecl fix_env (FixitySig rdr_name fixity 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 + mappM lookupTopSrcBndr_maybe (dataTcOccs rdr_name) `thenM` \ maybe_ns -> + case catMaybes maybe_ns of + [] -> addSrcLoc loc $ + addErr (unknownNameErr rdr_name) `thenM_` + returnM fix_env + ns -> foldlM add fix_env ns + where + add fix_env name + = case lookupNameEnv fix_env name of + Just (FixitySig _ _ loc') -> addErr (dupFixityDecl rdr_name loc loc') `thenM_` + returnM fix_env + Nothing -> returnM (extendNameEnv fix_env name (FixitySig name fixity loc)) + +dupFixityDecl rdr_name loc1 loc2 + = vcat [ptext SLIT("Multiple fixity declarations for") <+> quotes (ppr rdr_name), + ptext SLIT("at ") <+> ppr loc1, + ptext SLIT("and") <+> ppr loc2] +\end{code} -rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) -> - returnRn (ValD new_binds, fvs) +%********************************************************* +%* * + Source-code deprecations declarations +%* * +%********************************************************* -rnDecl (SigD (IfaceSig name ty id_infos loc)) - = pushSrcLocRn loc $ - lookupBndrRn name `thenRn` \ name' -> - rnIfaceType doc_str ty `thenRn` \ ty' -> +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. - -- 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) +\begin{code} +rnSrcDeprecDecls :: [RdrNameDeprecation] -> TcRn m Deprecations +rnSrcDeprecDecls [] + = returnM NoDeprecs + +rnSrcDeprecDecls decls + = mappM rn_deprec decls `thenM` \ pairs -> + returnM (DeprecSome (mkNameEnv (catMaybes pairs))) + where + rn_deprec (Deprecation rdr_name txt loc) + = addSrcLoc loc $ + lookupTopSrcBndr rdr_name `thenM` \ name -> + returnM (Just (name, (name,txt))) + +checkModDeprec :: Maybe DeprecTxt -> Deprecations +-- Check for a module deprecation; done once at top level +checkModDeprec Nothing = NoDeprecs +checkModdeprec (Just txt) = DeprecAll txt + +badDeprec d + = sep [ptext SLIT("Illegal deprecation when whole module is deprecated"), + nest 4 (ppr d)] \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. +\begin{code} +rnSrcDecl :: RdrNameHsDecl -> RnM (RenamedHsDecl, FreeVars) -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. +rnSrcDecl (ValD binds) = rnTopBinds binds `thenM` \ (new_binds, fvs) -> + returnM (ValD new_binds, fvs) -\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) - where - syn_doc = text "the declaration for type synonym" <+> quotes (ppr name) +rnSrcDecl (TyClD tycl_decl) + = rnTyClDecl tycl_decl `thenM` \ new_decl -> + finishSourceTyClDecl tycl_decl new_decl `thenM` \ (new_decl', fvs) -> + returnM (TyClD new_decl', fvs `plusFV` tyClDeclFVs new_decl') -rnDecl (TyClD (ClassDecl context cname tyvars sigs mbinds pragmas tname dname src_loc)) - = pushSrcLocRn src_loc $ +rnSrcDecl (InstD inst) + = rnInstDecl inst `thenM` \ new_inst -> + finishSourceInstDecl inst new_inst `thenM` \ (new_inst', fvs) -> + returnM (InstD new_inst', fvs `plusFV` instDeclFVs new_inst') - lookupBndrRn cname `thenRn` \ cname' -> +rnSrcDecl (RuleD rule) + = rnHsRuleDecl rule `thenM` \ (new_rule, fvs) -> + returnM (RuleD new_rule, fvs) - -- 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' -> +rnSrcDecl (ForD ford) + = rnHsForeignDecl ford `thenM` \ (new_ford, fvs) -> + returnM (ForD new_ford, fvs) - -- Tyvars scope over bindings and context - bindTyVarsFV2Rn cls_doc tyvars ( \ clas_tyvar_names tyvars' -> +rnSrcDecl (DefD (DefaultDecl tys src_loc)) + = addSrcLoc src_loc $ + mapFvRn (rnHsTypeFVs doc_str) tys `thenM` \ (tys', fvs) -> + returnM (DefD (DefaultDecl tys' src_loc), fvs) + where + doc_str = text "In a `default' declaration" - -- Check the superclasses - rnContext cls_doc context `thenRn` \ (context', cxt_fvs) -> - -- Check the signatures - let - -- Filter out fixity signatures; - -- they are done at top level - nofix_sigs = nonFixitySigs 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) -> +rnSrcDecl (CoreD (CoreDecl name ty rhs loc)) + = addSrcLoc loc $ + lookupTopBndrRn name `thenM` \ name' -> + rnHsTypeFVs doc_str ty `thenM` \ (ty', ty_fvs) -> + rnCoreExpr rhs `thenM` \ rhs' -> + returnM (CoreD (CoreDecl name' ty' rhs' loc), + ty_fvs `plusFV` ufExprFVs rhs') + where + doc_str = text "In the Core declaration for" <+> quotes (ppr name) +\end{code} - -- Check the methods - checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_` - rnMethodBinds mbinds `thenRn` \ (mbinds', meth_fvs) -> +%********************************************************* +%* * + Bindings +%* * +%********************************************************* - -- 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. +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. - 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) - ) +\begin{code} +rnTopBinds :: RdrNameHsBinds -> RnM (RenamedHsBinds, FreeVars) +rnTopBinds EmptyBinds = returnM (EmptyBinds, emptyFVs) +rnTopBinds (MonoBind bind sigs _) = rnTopMonoBinds bind sigs + -- The parser doesn't produce other forms + +rnBinds :: RdrNameHsBinds + -> (RenamedHsBinds -> RnM (result, FreeVars)) + -> RnM (result, FreeVars) +rnBinds EmptyBinds thing_inside = thing_inside EmptyBinds +rnBinds (MonoBind bind sigs _) thing_inside = rnMonoBinds bind sigs thing_inside + -- the parser doesn't produce other forms +\end{code} + + +%********************************************************* +%* * +\subsection{Foreign declarations} +%* * +%********************************************************* + +\begin{code} +rnHsForeignDecl (ForeignImport name ty spec isDeprec src_loc) + = addSrcLoc src_loc $ + lookupTopBndrRn name `thenM` \ name' -> + rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) -> + returnM (ForeignImport name' ty' spec isDeprec src_loc, + fvs `plusFV` extras spec) 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) + extras (CImport _ _ _ _ CWrapper) = mkFVs [newStablePtrName, + bindIOName, returnIOName] + extras _ = emptyFVs + +rnHsForeignDecl (ForeignExport name ty spec isDeprec src_loc) + = addSrcLoc src_loc $ + lookupOccRn name `thenM` \ name' -> + rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) -> + returnM (ForeignExport name' ty' spec isDeprec src_loc, + mkFVs [bindIOName, returnIOName] `plusFV` fvs) + +fo_decl_msg name = ptext SLIT("In the foreign declaration for") <+> ppr name \end{code} @@ -268,172 +314,370 @@ 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) -> +rnInstDecl (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc) + -- Used for both source and interface file decls + = addSrcLoc src_loc $ + rnHsSigType (text "an instance decl") inst_ty `thenM` \ inst_ty' -> + + (case maybe_dfun_rdr_name of + Nothing -> returnM Nothing + Just dfun_rdr_name -> lookupGlobalOccRn dfun_rdr_name `thenM` \ dfun_name -> + returnM (Just dfun_name) + ) `thenM` \ maybe_dfun_name -> + + -- The typechecker checks that all the bindings are for the right class. + returnM (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 - 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 = collectLocatedMonoBinders mbinds + (inst_tyvars, _, cls,_) = splitHsInstDeclTy inst_ty -- (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) -> + checkDupNames meth_doc meth_names `thenM_` + extendTyVarEnvForMethodBinds inst_tyvars ( + rnMethodBinds cls [] mbinds + ) `thenM` \ (mbinds', meth_fvs) -> let - binders = mkNameSet (map fst (bagToList (collectMonoBinders mbinds'))) + binders = collectMonoBinders mbinds' + binder_set = mkNameSet binders in - renameSigs NotTopLevel True binders uprags `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) + -- 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 + ) `thenM` \ (uprags', prag_fvs) -> + + returnM (InstDecl inst_ty mbinds' uprags' maybe_dfun_name src_loc, + meth_fvs `plusFV` prag_fvs) \end{code} %********************************************************* %* * -\subsection{Default declarations} +\subsection{Rules} %* * %********************************************************* \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) +rnIfaceRuleDecl (IfaceRule rule_name act vars fn args rhs src_loc) + = addSrcLoc src_loc $ + lookupOccRn fn `thenM` \ fn' -> + rnCoreBndrs vars $ \ vars' -> + mappM rnCoreExpr args `thenM` \ args' -> + rnCoreExpr rhs `thenM` \ rhs' -> + returnM (IfaceRule rule_name act vars' fn' args' rhs' src_loc) + +rnIfaceRuleDecl (IfaceRuleOut fn rule) -- Builtin rules come this way + = lookupOccRn fn `thenM` \ fn' -> + returnM (IfaceRuleOut fn' rule) + +rnHsRuleDecl (HsRule rule_name act vars lhs rhs src_loc) + = addSrcLoc src_loc $ + bindPatSigTyVars (collectRuleBndrSigTys vars) $ + + bindLocalsFVRn doc (map get_var vars) $ \ ids -> + mapFvRn rn_var (vars `zip` ids) `thenM` \ (vars', fv_vars) -> + + rnExpr lhs `thenM` \ (lhs', fv_lhs) -> + rnExpr rhs `thenM` \ (rhs', fv_rhs) -> + checkErr (validRuleLhs ids lhs') + (badRuleLhsErr rule_name lhs') `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' src_loc, + fv_vars `plusFV` fv_lhs `plusFV` fv_rhs) where - doc_str = text "a `default' declaration" + doc = text "In the transformation rule" <+> ftext rule_name + + get_var (RuleBndr v) = v + get_var (RuleBndrSig v _) = v + + rn_var (RuleBndr v, id) = returnM (RuleBndr id, emptyFVs) + rn_var (RuleBndrSig v t, id) = rnHsTypeFVs doc t `thenM` \ (t', fvs) -> + returnM (RuleBndrSig id t', fvs) \end{code} -%********************************************************* -%* * -\subsection{Foreign declarations} -%* * -%********************************************************* +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} -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 - +validRuleLhs foralls lhs + = check lhs + where + check (OpApp _ op _ _) = check op + check (HsApp e1 e2) = check e1 + check (HsVar v) | v `notElem` foralls = True + check other = False \end{code} + %********************************************************* %* * -\subsection{Support code for type/data declarations} +\subsection{Type, class and iface sig declarations} %* * %********************************************************* +@rnTyDecl@ uses the `global name function' to create a new type +declaration in which local names have been replaced by their original +names, reporting any unknown names. + +Renaming type variables is a pain. Because they now contain uniques, +it is necessary to pass in an association list which maps a parsed +tyvar to its @Name@ representation. +In some cases (type signatures of values), +it is even necessary to go over the type first +in order to get the set of tyvars used by it, make an assoc list, +and then go over it again to rename the tyvars! +However, we can also do some scoping checks at the same time. + \begin{code} -rnDerivs :: Maybe [RdrName] -> RnMS s (Maybe [Name], FreeVars) +rnTyClDecl (IfaceSig {tcdName = name, tcdType = ty, tcdIdInfo = id_infos, tcdLoc = loc}) + = addSrcLoc loc $ + lookupTopBndrRn name `thenM` \ name' -> + rnHsType doc_str ty `thenM` \ ty' -> + mappM rnIdInfo id_infos `thenM` \ id_infos' -> + returnM (IfaceSig {tcdName = name', tcdType = ty', tcdIdInfo = id_infos', tcdLoc = loc}) + where + doc_str = text "In the interface signature for" <+> quotes (ppr name) + +rnTyClDecl (ForeignType {tcdName = name, tcdFoType = fo_type, tcdExtName = ext_name, tcdLoc = loc}) + = addSrcLoc loc $ + lookupTopBndrRn name `thenM` \ name' -> + returnM (ForeignType {tcdName = name', tcdFoType = fo_type, tcdExtName = ext_name, tcdLoc = loc}) + +rnTyClDecl (TyData {tcdND = new_or_data, tcdCtxt = context, tcdName = tycon, + tcdTyVars = tyvars, tcdCons = condecls, tcdGeneric = want_generic, + tcdDerivs = derivs, tcdLoc = src_loc}) + = addSrcLoc src_loc $ + lookupTopBndrRn tycon `thenM` \ tycon' -> + bindTyVarsRn data_doc tyvars $ \ tyvars' -> + rnContext data_doc context `thenM` \ context' -> + rn_derivs derivs `thenM` \ derivs' -> + checkDupOrQualNames data_doc con_names `thenM_` + + rnConDecls tycon' condecls `thenM` \ condecls' -> + returnM (TyData {tcdND = new_or_data, tcdCtxt = context', tcdName = tycon', + tcdTyVars = tyvars', tcdCons = condecls', tcdGeneric = want_generic, + tcdDerivs = derivs', tcdLoc = src_loc}) + where + data_doc = text "In the data type declaration for" <+> quotes (ppr tycon) + con_names = map conDeclName (visibleDataCons condecls) + + rn_derivs Nothing = returnM Nothing + rn_derivs (Just ds) = rnContext data_doc ds `thenM` \ ds' -> returnM (Just ds') + +rnTyClDecl (TySynonym {tcdName = name, tcdTyVars = tyvars, tcdSynRhs = ty, tcdLoc = src_loc}) + = addSrcLoc src_loc $ + lookupTopBndrRn name `thenM` \ name' -> + bindTyVarsRn syn_doc tyvars $ \ tyvars' -> + rnHsType syn_doc ty `thenM` \ ty' -> + returnM (TySynonym {tcdName = name', tcdTyVars = tyvars', tcdSynRhs = ty', tcdLoc = src_loc}) + where + syn_doc = text "In the declaration for type synonym" <+> quotes (ppr name) + +rnTyClDecl (ClassDecl {tcdCtxt = context, tcdName = cname, + tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs, + tcdLoc = src_loc}) + -- Used for both source and interface file decls + = addSrcLoc src_loc $ -rnDerivs Nothing -- derivs not specified - = returnRn (Nothing, emptyFVs) + lookupTopBndrRn cname `thenM` \ cname' -> -rnDerivs (Just ds) - = mapRn rn_deriv ds `thenRn` \ derivs -> - returnRn (Just derivs, foldl addOneFV emptyFVs derivs) + -- Tyvars scope over superclass context and method signatures + bindTyVarsRn cls_doc tyvars $ \ tyvars' -> + + -- Check the superclasses + rnContext cls_doc context `thenM` \ context' -> + + -- Check the functional dependencies + rnFds cls_doc fds `thenM` \ fds' -> + + -- Check the signatures + -- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs). + let + (op_sigs, non_op_sigs) = partition isClassOpSig sigs + sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs] + in + checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenM_` + mappM (rnClassOp cname' fds') op_sigs `thenM` \ sigs' -> + let + binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ] + in + renameSigs (okClsDclSig binders) non_op_sigs `thenM` \ 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. + + returnM (ClassDecl { tcdCtxt = context', tcdName = cname', tcdTyVars = tyvars', + tcdFDs = fds', tcdSigs = non_ops' ++ sigs', tcdMeths = Nothing, + tcdLoc = src_loc}) where - rn_deriv clas - = lookupOccRn clas `thenRn` \ clas_name -> + cls_doc = text "In the declaration for class" <+> ppr cname + sig_doc = text "In the signatures for class" <+> ppr cname - -- 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 +rnClassOp clas clas_fds sig@(ClassOpSig op dm_stuff ty locn) + = addSrcLoc locn $ + lookupTopBndrRn op `thenM` \ op_name -> + + -- Check the signature + rnHsSigType (quotes (ppr op)) ty `thenM` \ new_ty -> + + -- Make the default-method name + (case dm_stuff of + DefMeth dm_rdr_name + -> -- Imported class that has a default method decl + lookupSysBndr dm_rdr_name `thenM` \ dm_name -> + returnM (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 -> returnM GenDefMeth + NoDefMeth -> returnM NoDefMeth + ) `thenM` \ dm_stuff' -> + + returnM (ClassOpSig op_name dm_stuff' new_ty locn) + +finishSourceTyClDecl :: RdrNameTyClDecl -> RenamedTyClDecl -> RnM (RenamedTyClDecl, FreeVars) + -- Used for source file decls only + -- Renames the default-bindings of a class decl +finishSourceTyClDecl (ClassDecl {tcdMeths = Just mbinds, tcdLoc = src_loc}) -- Get mbinds from here + rn_cls_decl@(ClassDecl {tcdName = cls, 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 + addSrcLoc src_loc $ + extendTyVarEnvForMethodBinds tyvars $ + getLocalRdrEnv `thenM` \ name_env -> + let + meth_rdr_names_w_locs = collectLocatedMonoBinders mbinds + gen_rdr_tyvars_w_locs = [(tv,src_loc) | tv <- extractGenericPatTyVars mbinds, + not (tv `elemRdrEnv` name_env)] + in + checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenM_` + newLocalsRn gen_rdr_tyvars_w_locs `thenM` \ gen_tyvars -> + rnMethodBinds cls gen_tyvars mbinds `thenM` \ (mbinds', meth_fvs) -> + returnM (rn_cls_decl {tcdMeths = Just mbinds'}, meth_fvs) + where + meth_doc = text "In the default-methods for class" <+> ppr (tcdName rn_cls_decl) + +finishSourceTyClDecl _ tycl_decl@(TyData {tcdDerivs = derivings}) + -- Derivings are returned here so that they don't form part of the tyClDeclFVs. + -- This is important, because tyClDeclFVs should contain only the + -- FVs that are `needed' by the interface file declaration, and + -- derivings do not appear in this. It also means that the tcGroups + -- are smaller, which turned out to be important for the usage inference. KSW 2002-02. + = returnM (tycl_decl, + maybe emptyFVs extractHsCtxtTyNames derivings) + +finishSourceTyClDecl _ tycl_decl = returnM (tycl_decl, emptyFVs) + -- Not a class declaration +\end{code} - Just occs -> mapRn lookupImplicitOccRn occs `thenRn_` - returnRn clas_name +For the method bindings in class and instance decls, we extend the +type variable environment iff -fglasgow-exts +\begin{code} +extendTyVarEnvForMethodBinds tyvars thing_inside + = doptM Opt_GlasgowExts `thenM` \ opt_GlasgowExts -> + if opt_GlasgowExts then + extendTyVarEnvFVRn (map hsTyVarName tyvars) thing_inside + else + thing_inside \end{code} + +%********************************************************* +%* * +\subsection{Support code for type/data declarations} +%* * +%********************************************************* + \begin{code} conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc) conDeclName (ConDecl n _ _ _ l) = (n,l) -rnConDecl :: RdrNameConDecl -> RnMS s (RenamedConDecl, FreeVars) +rnConDecls :: Name -> DataConDetails RdrNameConDecl -> RnM (DataConDetails RenamedConDecl) +rnConDecls tycon Unknown = returnM Unknown +rnConDecls tycon (HasCons n) = returnM (HasCons n) +rnConDecls tycon (DataCons 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 -> + getModeRn `thenM` \ mode -> + checkErr (glaExts || isInterfaceMode mode) + (emptyConDeclsErr tycon) + else returnM () + ) `thenM_` + + mappM rnConDecl condecls `thenM` \ condecls' -> + returnM (DataCons condecls') + +rnConDecl :: RdrNameConDecl -> RnM RenamedConDecl 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) + = addSrcLoc locn $ + checkConName name `thenM_` + lookupTopBndrRn name `thenM` \ new_name -> + + bindTyVarsRn doc tvs $ \ new_tyvars -> + rnContext doc cxt `thenM` \ new_context -> + rnConDetails doc locn details `thenM` \ new_details -> + returnM (ConDecl new_name new_tyvars new_context new_details locn) where - doc = text "the definition of data constructor" <+> quotes (ppr name) + doc = text "In 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) +rnConDetails doc locn (PrefixCon tys) + = mappM (rnBangTy doc) tys `thenM` \ new_tys -> + returnM (PrefixCon 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 `thenM` \ new_ty1 -> + rnBangTy doc ty2 `thenM` \ new_ty2 -> + returnM (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) + = checkDupOrQualNames doc field_names `thenM_` + mappM (rnField doc) fields `thenM` \ new_fields -> + returnM (RecCon new_fields) where - field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds] + field_names = [(fld, locn) | (fld, _) <- fields] -rnField doc (names, ty) - = mapRn lookupBndrRn names `thenRn` \ new_names -> - rnBangTy doc ty `thenRn` \ (new_ty, fvs) -> - returnRn ((new_names, new_ty), fvs) +rnField doc (name, ty) + = lookupTopBndrRn name `thenM` \ new_name -> + rnBangTy doc ty `thenM` \ new_ty -> + returnM (new_name, new_ty) -rnBangTy doc (Banged ty) - = rnHsType doc ty `thenRn` \ (new_ty, fvs) -> - returnRn (Banged new_ty, fvs) - -rnBangTy doc (Unbanged ty) - = rnHsType doc ty `thenRn` \ (new_ty, fvs) -> - returnRn (Unbanged new_ty, fvs) - -rnBangTy doc (Unpacked ty) - = rnHsType doc ty `thenRn` \ (new_ty, fvs) -> - returnRn (Unpacked new_ty, fvs) +rnBangTy doc (BangType s ty) + = rnHsType doc ty `thenM` \ new_ty -> + returnM (BangType s new_ty) -- This data decl will parse OK -- data T = a Int @@ -446,40 +690,7 @@ rnBangTy doc (Unpacked ty) -- from interface files, which always print in prefix form checkConName name - = checkRn (isRdrDataCon name) - (badDataCon name) -\end{code} - - -%********************************************************* -%* * -\subsection{Naming a dfun} -%* * -%********************************************************* - -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 + = checkErr (isRdrDataCon name) (badDataCon name) \end{code} @@ -490,339 +701,227 @@ mkDFunName inst_ty maybe_df src_loc %********************************************************* \begin{code} -rnHsSigType :: SDoc -> RdrNameHsType -> RnMS s (RenamedHsType, FreeVars) - -- rnHsSigType is used for source-language type signatures, - -- which use *implicit* universal quantification. -rnHsSigType doc_str ty - = rnHsType (text "the type signature for" <+> doc_str) ty - -rnIfaceType :: SDoc -> RdrNameHsType -> RnMS s RenamedHsType -rnIfaceType doc ty - = rnHsType doc ty `thenRn` \ (ty,_) -> - returnRn ty - - -rnForAll doc forall_tyvars ctxt ty - = bindTyVarsFVRn doc forall_tyvars $ \ new_tyvars -> - rnContext doc ctxt `thenRn` \ (new_ctxt, cxt_fvs) -> - rnHsType doc ty `thenRn` \ (new_ty, ty_fvs) -> - returnRn (mkHsForAllTy new_tyvars new_ctxt new_ty, - cxt_fvs `plusFV` ty_fvs) - --- Check that each constraint mentions at least one of the forall'd type variables --- Since the forall'd type variables are a subset of the free tyvars --- of the tau-type part, this guarantees that every constraint mentions --- at least one of the free tyvars in ty -checkConstraints explicit_forall doc forall_tyvars ctxt ty - = mapRn check ctxt `thenRn` \ maybe_ctxt' -> - returnRn (catMaybes maybe_ctxt') - -- Remove problem ones, to avoid duplicate error message. - where - check ct@(_,tys) - | forall_mentioned = returnRn (Just ct) - | otherwise = addErrRn (ctxtErr explicit_forall doc forall_tyvars ct ty) `thenRn_` - returnRn Nothing - where - forall_mentioned = foldr ((||) . any (`elem` forall_tyvars) . extractHsTyVars) - False - tys - - -rnHsType :: SDoc -> RdrNameHsType -> RnMS s (RenamedHsType, FreeVars) - -rnHsType doc (HsForAllTy Nothing ctxt ty) - -- From source code (no kinds on tyvars) - -- Given the signature C => T we universally quantify - -- over FV(T) \ {in-scope-tyvars} - = 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) - where - tup_con_name = tupleTyCon_name boxed (length tys) - -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 (MonoDictTy clas tys) - = lookupOccRn clas `thenRn` \ clas' -> - rnHsTypes doc tys `thenRn` \ (tys', fvs) -> - returnRn (MonoDictTy clas' tys', fvs `addOneFV` clas') +rnFds :: SDoc -> [FunDep RdrName] -> RnM [FunDep Name] -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) -> - let - (_, dup_asserts) = removeDups cmp_assert theta - in - -- Check for duplicate assertions - -- If this isn't an error, then it ought to be: - mapRn (addWarnRn . dupClassAssertWarn theta) dup_asserts `thenRn_` - - returnRn (theta, plusFVs fvs_s) +rnFds doc fds + = mappM 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 `thenM` \ tys1' -> + rnHsTyVars doc tys2 `thenM` \ tys2' -> + returnM (tys1', tys2') - cmp_assert (c1,tys1) (c2,tys2) - = (c1 `compare` c2) `thenCmp` (cmpHsTypes compare tys1 tys2) +rnHsTyVars doc tvs = mappM (rnHsTyvar doc) tvs +rnHsTyvar doc tyvar = lookupOccRn tyvar \end{code} - %********************************************************* -%* * +%* * \subsection{IdInfo} -%* * +%* * %********************************************************* \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') - where - doc = text "Specialise in interface pragma" +rnIdInfo (HsWorker worker arity) + = lookupOccRn worker `thenM` \ worker' -> + returnM (HsWorker worker' arity) + +rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenM` \ expr' -> + returnM (HsUnfold inline expr') +rnIdInfo (HsStrictness str) = returnM (HsStrictness str) +rnIdInfo (HsArity arity) = returnM (HsArity arity) +rnIdInfo HsNoCafRefs = returnM HsNoCafRefs \end{code} -UfCore expressions. +@UfCore@ expressions. \begin{code} rnCoreExpr (UfType ty) - = rnIfaceType (text "unfolding type") ty `thenRn` \ ty' -> - returnRn (UfType ty') + = rnHsType (text "unfolding type") ty `thenM` \ ty' -> + returnM (UfType ty') rnCoreExpr (UfVar v) - = lookupOccRn v `thenRn` \ v' -> - returnRn (UfVar v') + = lookupOccRn v `thenM` \ v' -> + returnM (UfVar v') + +rnCoreExpr (UfLit l) + = returnM (UfLit l) -rnCoreExpr (UfCon con args) - = rnUfCon con `thenRn` \ con' -> - mapRn rnCoreExpr args `thenRn` \ args' -> - returnRn (UfCon con' args') +rnCoreExpr (UfLitLit l ty) + = rnHsType (text "litlit") ty `thenM` \ ty' -> + returnM (UfLitLit l ty') -rnCoreExpr (UfTuple con args) - = lookupOccRn con `thenRn` \ con' -> - mapRn rnCoreExpr args `thenRn` \ args' -> - returnRn (UfTuple con' args') +rnCoreExpr (UfFCall cc ty) + = rnHsType (text "ccall") ty `thenM` \ ty' -> + returnM (UfFCall cc ty') + +rnCoreExpr (UfTuple (HsTupCon boxity arity) args) + = mappM rnCoreExpr args `thenM` \ args' -> + returnM (UfTuple (HsTupCon boxity arity) args') rnCoreExpr (UfApp fun arg) - = rnCoreExpr fun `thenRn` \ fun' -> - rnCoreExpr arg `thenRn` \ arg' -> - returnRn (UfApp fun' arg') + = rnCoreExpr fun `thenM` \ fun' -> + rnCoreExpr arg `thenM` \ arg' -> + returnM (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 (UfCase scrut bndr alts) + = rnCoreExpr scrut `thenM` \ scrut' -> + bindCoreLocalRn bndr $ \ bndr' -> + mappM rnCoreAlt alts `thenM` \ alts' -> + returnM (UfCase scrut' bndr' alts') rnCoreExpr (UfNote note expr) - = rnNote note `thenRn` \ note' -> - rnCoreExpr expr `thenRn` \ expr' -> - returnRn (UfNote note' expr') + = rnNote note `thenM` \ note' -> + rnCoreExpr expr `thenM` \ expr' -> + returnM (UfNote note' expr') rnCoreExpr (UfLam bndr body) = rnCoreBndr bndr $ \ bndr' -> - rnCoreExpr body `thenRn` \ body' -> - returnRn (UfLam bndr' body') + rnCoreExpr body `thenM` \ body' -> + returnM (UfLam bndr' body') rnCoreExpr (UfLet (UfNonRec bndr rhs) body) - = rnCoreExpr rhs `thenRn` \ rhs' -> + = rnCoreExpr rhs `thenM` \ rhs' -> rnCoreBndr bndr $ \ bndr' -> - rnCoreExpr body `thenRn` \ body' -> - returnRn (UfLet (UfNonRec bndr' rhs') body') + rnCoreExpr body `thenM` \ body' -> + returnM (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') + mappM rnCoreExpr rhss `thenM` \ rhss' -> + rnCoreExpr body `thenM` \ body' -> + returnM (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'] -> + = rnHsType doc ty `thenM` \ ty' -> + bindCoreLocalRn name $ \ name' -> thing_inside (UfValBinder name' ty') where - str = "unfolding id" + doc = text "unfolding id" rnCoreBndr (UfTyBinder name kind) thing_inside - = bindLocalsRn "an 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 "an unfolding alt" bndrs $ \ bndrs' -> - rnCoreExpr rhs `thenRn` \ rhs' -> - returnRn (con', bndrs', rhs') - + = rnUfCon con `thenM` \ con' -> + bindCoreLocalsRn bndrs $ \ bndrs' -> + rnCoreExpr rhs `thenM` \ rhs' -> + returnM (con', bndrs', rhs') rnNote (UfCoerce ty) - = rnIfaceType (text "unfolding coerce") ty `thenRn` \ ty' -> - returnRn (UfCoerce ty') + = rnHsType (text "unfolding coerce") ty `thenM` \ ty' -> + returnM (UfCoerce ty') -rnNote (UfSCC cc) = returnRn (UfSCC cc) -rnNote UfInlineCall = returnRn UfInlineCall +rnNote (UfSCC cc) = returnM (UfSCC cc) +rnNote UfInlineCall = returnM UfInlineCall +rnNote UfInlineMe = returnM UfInlineMe rnUfCon UfDefault - = returnRn UfDefault - -rnUfCon (UfDataCon con) - = lookupOccRn con `thenRn` \ con' -> - returnRn (UfDataCon con') + = returnM UfDefault -rnUfCon (UfLitCon lit) - = returnRn (UfLitCon lit) +rnUfCon (UfTupleAlt tup_con) + = returnM (UfTupleAlt tup_con) -rnUfCon (UfLitLitCon lit ty) - = rnIfaceType (text "litlit") ty `thenRn` \ ty' -> - returnRn (UfLitLitCon lit ty') +rnUfCon (UfDataAlt con) + = lookupOccRn con `thenM` \ con' -> + returnM (UfDataAlt con') -rnUfCon (UfPrimOp op) - = lookupOccRn op `thenRn` \ op' -> - returnRn (UfPrimOp op') +rnUfCon (UfLitAlt lit) + = returnM (UfLitAlt lit) -rnUfCon (UfCCallOp str is_dyn casm gc) - = returnRn (UfCCallOp str is_dyn casm gc) +rnUfCon (UfLitLitAlt lit ty) + = rnHsType (text "litlit") ty `thenM` \ ty' -> + returnM (UfLitLitAlt lit ty') \end{code} %********************************************************* %* * -\subsection{Errors} +\subsection{Statistics} %* * %********************************************************* \begin{code} -derivingNonStdClassErr clas - = hsep [ptext SLIT("non-standard class"), ppr clas, ptext SLIT("in deriving clause")] +rnStats :: [RenamedHsDecl] -- Imported decls + -> TcRn m () +rnStats imp_decls + = doptM Opt_D_dump_rn_trace `thenM` \ dump_rn_trace -> + doptM Opt_D_dump_rn_stats `thenM` \ dump_rn_stats -> + doptM Opt_D_dump_rn `thenM` \ dump_rn -> + getEps `thenM` \ eps -> + + ioToTcRn (dumpIfSet (dump_rn_trace || dump_rn_stats || dump_rn) + "Renamer statistics" + (getRnStats eps imp_decls)) `thenM_` + returnM () + +getRnStats :: ExternalPackageState -> [RenamedHsDecl] -> SDoc +getRnStats eps imported_decls + = hcat [text "Renamer stats: ", stats] + where + n_mods = length [() | _ <- moduleEnvElts (eps_PIT eps)] + -- This is really only right for a one-shot compile -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) + (decls_map, n_decls_slurped) = eps_decls eps + + n_decls_left = length [decl | (avail, True, (_,decl)) <- nameEnvElts decls_map + -- Data, newtype, and class decls are in the decls_fm + -- under multiple names; the tycon/class, and each + -- constructor/class op too. + -- The 'True' selects just the 'main' decl + ] + + (insts_left, n_insts_slurped) = eps_insts eps + n_insts_left = length (bagToList insts_left) + + (rules_left, n_rules_slurped) = eps_rules eps + n_rules_left = length (bagToList rules_left) + + stats = vcat + [int n_mods <+> text "interfaces read", + hsep [ int n_decls_slurped, text "type/class/variable imported, out of", + int (n_decls_slurped + n_decls_left), text "read"], + hsep [ int n_insts_slurped, text "instance decls imported, out of", + int (n_insts_slurped + n_insts_left), text "read"], + hsep [ int n_rules_slurped, text "rule decls imported, out of", + int (n_rules_slurped + n_rules_left), text "read"] + ] +\end{code} -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("..."))] +%********************************************************* +%* * +\subsection{Errors} +%* * +%********************************************************* +\begin{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)) - ] +badRuleLhsErr name lhs + = sep [ptext SLIT("Rule") <+> ftext name <> colon, + nest 4 (ptext SLIT("Illegal left-hand side:") <+> ppr lhs)] $$ - (ptext SLIT("In") <+> doc) + ptext SLIT("LHS must be of form (f e1 .. en) where f is not forall'd") + +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")] + +emptyConDeclsErr tycon + = sep [quotes (ppr tycon) <+> ptext SLIT("has no constructors"), + nest 4 (ptext SLIT("(-fglasgow-exts permits this)"))] \end{code}