X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnSource.lhs;h=ccd609623dd75d9259448867f1a34d56a603b8aa;hb=495ef8bd9ef30bffe50ea399b91e3ba09646b59a;hp=235e9459385f639e3a4c667d3a3a653ec5327f37;hpb=f9120c200bcf613b58d742802172fb4c08171f0d;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnSource.lhs b/ghc/compiler/rename/RnSource.lhs index 235e945..ccd6096 100644 --- a/ghc/compiler/rename/RnSource.lhs +++ b/ghc/compiler/rename/RnSource.lhs @@ -1,104 +1,124 @@ % -% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996 +% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998 % \section[RnSource]{Main pass of renamer} \begin{code} -#include "HsVersions.h" - -module RnSource ( rnSource, rnPolyType ) where +module RnSource ( rnDecl, rnSourceDecls, rnHsType, rnHsSigType ) where -import Ubiq -import RnLoop -- *check* the RnPass4/RnExpr4/RnBinds4 loop-breaking +#include "HsVersions.h" +import RnExpr import HsSyn import HsPragmas -import RdrHsSyn +import HsTypes ( getTyVarName ) +import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, isRdrTyVar, mkRdrNameWkr ) +import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl, + extractRuleBndrsTyVars, extractHsTyRdrTyVars, extractHsTysRdrTyVars + ) import RnHsSyn +import HsCore + +import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, unknownSigErr ) +import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn, getIPName, + lookupImplicitOccRn, lookupImplicitOccsRn, + bindLocalsRn, bindLocalRn, bindLocalsFVRn, bindUVarRn, + bindTyVarsFVRn, bindTyVarsFV2Rn, extendTyVarEnvFVRn, + bindCoreLocalFVRn, bindCoreLocalsFVRn, + checkDupOrQualNames, checkDupNames, + mkImportedGlobalName, mkImportedGlobalFromRdrName, + newDFunName, getDFunKey, newImplicitBinder, + FreeVars, emptyFVs, plusFV, plusFVs, unitFV, addOneFV, mapFvRn + ) import RnMonad -import RnBinds ( rnTopBinds, rnMethodBinds ) +import FunDeps ( oclose ) +import Class ( FunDep ) + +import Name ( Name, OccName, + ExportFlag(..), Provenance(..), + nameOccName, NamedThing(..) + ) +import NameSet +import OccName ( mkDefaultMethodOcc ) +import BasicTypes ( TopLevelFlag(..) ) +import FiniteMap ( elemFM ) +import PrelInfo ( derivableClassKeys, cCallishClassKeys, + deRefStablePtr_RDR, makeStablePtr_RDR, bindIO_RDR + ) import Bag ( bagToList ) -import Class ( derivableClassKeys ) -import ListSetOps ( unionLists, minusList ) -import Name ( RdrName ) -import Maybes ( maybeToBool, catMaybes ) -import Outputable ( isLocallyDefined, isAvarid, getLocalName, ExportFlag(..) ) -import Pretty +import List ( partition, nub ) +import Outputable import SrcLoc ( SrcLoc ) -import Unique ( Unique ) -import UniqFM ( addListToUFM, listToUFM ) -import UniqSet ( UniqSet(..) ) -import Util ( isn'tIn, panic, assertPanic ) - -rnExports mods Nothing = returnRn (\n -> ExportAll) -rnExports mods (Just exps) = returnRn (\n -> ExportAll) +import CmdLineOpts ( opt_GlasgowExts, opt_WarnUnusedMatches ) -- Warn of unused for-all'd tyvars +import Unique ( Uniquable(..) ) +import UniqFM ( lookupUFM ) +import ErrUtils ( Message ) +import CStrings ( isCLabelString ) +import Maybes ( maybeToBool, catMaybes ) +import Util \end{code} -rnSource `renames' the source module and export list. +@rnDecl@ `renames' declarations. It simultaneously performs dependency analysis and precedence parsing. It also does the following error checks: \begin{enumerate} \item Checks that tyvars are used properly. This includes checking for undefined tyvars, and tyvars in contexts that are ambiguous. +(Some of this checking has now been moved to module @TcMonoType@, +since we don't have functional dependency information at this point.) \item Checks that all variable occurences are defined. \item -Checks the (..) etc constraints in the export list. +Checks the @(..)@ etc constraints in the export list. \end{enumerate} +%********************************************************* +%* * +\subsection{Value declarations} +%* * +%********************************************************* + \begin{code} -rnSource :: [Module] -- imported modules - -> Bag RenamedFixityDecl -- fixity info for imported names - -> RdrNameHsModule - -> RnM s (RenamedHsModule, - Name -> ExportFlag, -- export info - Bag (RnName, RdrName)) -- occurrence info - -rnSource imp_mods imp_fixes (HsModule mod version exports _ fixes - ty_decls specdata_sigs class_decls - inst_decls specinst_sigs defaults - binds _ src_loc) +rnSourceDecls :: [RdrNameHsDecl] -> RnMS ([RenamedHsDecl], FreeVars) + -- The decls get reversed, but that's ok - = pushSrcLocRn src_loc $ +rnSourceDecls decls + = go emptyFVs [] decls + where + -- Fixity and deprecations have been dealt with already; ignore them + go fvs ds' [] = returnRn (ds', fvs) + go fvs ds' (FixD _:ds) = go fvs ds' ds + go fvs ds' (DeprecD _:ds) = go fvs ds' ds + go fvs ds' (d:ds) = rnDecl d `thenRn` \(d', fvs') -> + go (fvs `plusFV` fvs') (d':ds') ds +\end{code} - rnExports (mod:imp_mods) exports `thenRn` \ exported_fn -> - rnFixes fixes `thenRn` \ src_fixes -> - let - pair_name (InfixL n i) = (n, i) - pair_name (InfixR n i) = (n, i) - pair_name (InfixN n i) = (n, i) - imp_fixes_fm = listToUFM (map pair_name (bagToList imp_fixes)) - all_fixes_fm = addListToUFM imp_fixes_fm (map pair_name src_fixes) - in - setExtraRn {-all_fixes_fm-}(panic "rnSource:all_fixes_fm") $ - - mapRn rnTyDecl ty_decls `thenRn` \ new_ty_decls -> - mapRn rnSpecDataSig specdata_sigs `thenRn` \ new_specdata_sigs -> - mapRn rnClassDecl class_decls `thenRn` \ new_class_decls -> - mapRn rnInstDecl inst_decls `thenRn` \ new_inst_decls -> - mapRn rnSpecInstSig specinst_sigs `thenRn` \ new_specinst_sigs -> - rnDefaultDecl defaults `thenRn` \ new_defaults -> - rnTopBinds binds `thenRn` \ new_binds -> - - getOccurrenceUpRn `thenRn` \ occ_info -> - - returnRn ( - HsModule mod version - trashed_exports trashed_imports - {-new_fixes-}(panic "rnSource:new_fixes (Hi, Patrick!)") - new_ty_decls new_specdata_sigs new_class_decls - new_inst_decls new_specinst_sigs new_defaults - new_binds [] src_loc, - exported_fn, - occ_info - ) +%********************************************************* +%* * +\subsection{Value declarations} +%* * +%********************************************************* + +\begin{code} +-- rnDecl does all the work +rnDecl :: RdrNameHsDecl -> RnMS (RenamedHsDecl, FreeVars) + +rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) -> + returnRn (ValD new_binds, fvs) + + +rnDecl (SigD (IfaceSig name ty id_infos loc)) + = pushSrcLocRn loc $ + mkImportedGlobalFromRdrName name `thenRn` \ name' -> + rnHsType doc_str ty `thenRn` \ (ty',fvs1) -> + mapFvRn rnIdInfo id_infos `thenRn` \ (id_infos', fvs2) -> + returnRn (SigD (IfaceSig name' ty' id_infos' loc), fvs1 `plusFV` fvs2) where - trashed_exports = panic "rnSource:trashed_exports" - trashed_imports = panic "rnSource:trashed_imports" + doc_str = text "the interface signature for" <+> quotes (ppr name) \end{code} %********************************************************* @@ -113,297 +133,399 @@ names, reporting any unknown names. Renaming type variables is a pain. Because they now contain uniques, it is necessary to pass in an association list which maps a parsed -tyvar to its Name representation. In some cases (type signatures of -values), it is even necessary to go over the type first in order to -get the set of tyvars used by it, make an assoc list, and then go over -it again to rename the tyvars! However, we can also do some scoping -checks at the same time. +tyvar to its @Name@ representation. +In some cases (type signatures of values), +it is even necessary to go over the type first +in order to get the set of tyvars used by it, make an assoc list, +and then go over it again to rename the tyvars! +However, we can also do some scoping checks at the same time. \begin{code} -rnTyDecl :: RdrNameTyDecl -> RnM_Fixes s RenamedTyDecl - -rnTyDecl (TyData context tycon tyvars condecls derivings pragmas src_loc) +rnDecl (TyClD (TyData new_or_data context tycon tyvars condecls nconstrs derivings pragmas src_loc)) = pushSrcLocRn src_loc $ - lookupTyCon tycon `thenRn` \ tycon' -> - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env, tyvars') -> - rnContext tv_env context `thenRn` \ context' -> - rnConDecls tv_env condecls `thenRn` \ condecls' -> - rn_derivs tycon' src_loc derivings `thenRn` \ derivings' -> + lookupBndrRn tycon `thenRn` \ tycon' -> + bindTyVarsFVRn data_doc tyvars $ \ tyvars' -> + rnContext data_doc context `thenRn` \ (context', cxt_fvs) -> + checkDupOrQualNames data_doc con_names `thenRn_` + mapFvRn rnConDecl condecls `thenRn` \ (condecls', con_fvs) -> + rnDerivs derivings `thenRn` \ (derivings', deriv_fvs) -> ASSERT(isNoDataPragmas pragmas) - returnRn (TyData context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc) + returnRn (TyClD (TyData new_or_data context' tycon' tyvars' condecls' nconstrs + derivings' noDataPragmas src_loc), + cxt_fvs `plusFV` con_fvs `plusFV` deriv_fvs) + where + data_doc = text "the data type declaration for" <+> quotes (ppr tycon) + con_names = map conDeclName condecls -rnTyDecl (TyNew context tycon tyvars condecl derivings pragmas src_loc) +rnDecl (TyClD (TySynonym name tyvars ty src_loc)) = pushSrcLocRn src_loc $ - lookupTyCon tycon `thenRn` \ tycon' -> - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env, tyvars') -> - rnContext tv_env context `thenRn` \ context' -> - rnConDecls tv_env condecl `thenRn` \ condecl' -> - rn_derivs tycon' src_loc derivings `thenRn` \ derivings' -> - ASSERT(isNoDataPragmas pragmas) - returnRn (TyNew context' tycon' tyvars' condecl' derivings' noDataPragmas src_loc) + lookupBndrRn name `thenRn` \ name' -> + bindTyVarsFVRn syn_doc tyvars $ \ tyvars' -> + rnHsType syn_doc (unquantify 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) -rnTyDecl (TySynonym name tyvars ty src_loc) + -- For H98 we do *not* universally quantify on the RHS of a synonym + -- Silently discard context... but the tyvars in the rest won't be in scope + unquantify (HsForAllTy Nothing ctxt ty) | not opt_GlasgowExts = ty + unquantify ty = ty + +rnDecl (TyClD (ClassDecl context cname tyvars fds sigs mbinds pragmas + tname dname dwname snames src_loc)) = pushSrcLocRn src_loc $ - lookupTyCon name `thenRn` \ name' -> - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env, tyvars') -> - rnMonoType tv_env ty `thenRn` \ ty' -> - returnRn (TySynonym name' tyvars' ty' src_loc) -rn_derivs tycon2 locn Nothing -- derivs not specified - = returnRn Nothing + lookupBndrRn cname `thenRn` \ cname' -> -rn_derivs tycon2 locn (Just ds) - = mapRn (rn_deriv tycon2 locn) ds `thenRn` \ derivs -> - returnRn (Just derivs) - where - rn_deriv tycon2 locn clas - = lookupClass clas `thenRn` \ clas_name -> - addErrIfRn (uniqueOf clas_name `not_elem` derivableClassKeys) - (derivingNonStdClassErr clas locn) - `thenRn_` - returnRn clas_name - where - not_elem = isn'tIn "rn_deriv" -\end{code} + -- 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 + mkImportedGlobalFromRdrName tname `thenRn` \ tname' -> + mkImportedGlobalFromRdrName dname `thenRn` \ dname' -> + mkImportedGlobalFromRdrName dwname `thenRn` \ dwname' -> + mapRn mkImportedGlobalFromRdrName snames `thenRn` \ snames' -> -@rnConDecls@ uses the `global name function' to create a new -constructor in which local names have been replaced by their original -names, reporting any unknown names. + -- Tyvars scope over bindings and context + bindTyVarsFV2Rn cls_doc tyvars ( \ clas_tyvar_names tyvars' -> -\begin{code} -rnConDecls :: TyVarNamesEnv - -> [RdrNameConDecl] - -> RnM_Fixes s [RenamedConDecl] + -- Check the superclasses + rnContext cls_doc context `thenRn` \ (context', cxt_fvs) -> + + -- Check the functional dependencies + rnFds cls_doc fds `thenRn` \ (fds', fds_fvs) -> + + -- Check the signatures + let + -- First process the class op sigs, then the fixity sigs. + (op_sigs, non_op_sigs) = partition isClassOpSig sigs + in + checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_` + mapFvRn (rn_op cname' clas_tyvar_names fds') op_sigs `thenRn` \ (sigs', sig_fvs) -> + let + binders = mkNameSet [ nm | (ClassOpSig nm _ _ _ _) <- sigs' ] + in + renameSigs (okClsDclSig binders) non_op_sigs `thenRn` \ (non_ops', fix_fvs) -> + + -- 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. -rnConDecls tv_env con_decls - = mapRn rn_decl con_decls + ASSERT(isNoClassPragmas pragmas) + returnRn (TyClD (ClassDecl context' cname' tyvars' fds' (non_ops' ++ sigs') mbinds' + NoClassPragmas tname' dname' dwname' snames' src_loc), + sig_fvs `plusFV` + fix_fvs `plusFV` + cxt_fvs `plusFV` + fds_fvs `plusFV` + meth_fvs + ) + ) where - rn_decl (ConDecl name tys src_loc) - = pushSrcLocRn src_loc $ - lookupValue name `thenRn` \ new_name -> - mapRn rn_bang_ty tys `thenRn` \ new_tys -> - returnRn (ConDecl new_name new_tys src_loc) - - rn_decl (ConOpDecl ty1 op ty2 src_loc) - = pushSrcLocRn src_loc $ - lookupValue op `thenRn` \ new_op -> - rn_bang_ty ty1 `thenRn` \ new_ty1 -> - rn_bang_ty ty2 `thenRn` \ new_ty2 -> - returnRn (ConOpDecl new_ty1 new_op new_ty2 src_loc) - - rn_decl (NewConDecl name ty src_loc) - = pushSrcLocRn src_loc $ - lookupValue name `thenRn` \ new_name -> - rn_mono_ty ty `thenRn` \ new_ty -> - returnRn (NewConDecl new_name new_ty src_loc) - - rn_decl (RecConDecl con fields src_loc) - = panic "rnConDecls:RecConDecl" - - ---------- - rn_mono_ty = rnMonoType tv_env - - rn_bang_ty (Banged ty) - = rn_mono_ty ty `thenRn` \ new_ty -> - returnRn (Banged new_ty) - rn_bang_ty (Unbanged ty) - = rn_mono_ty ty `thenRn` \ new_ty -> - returnRn (Unbanged new_ty) + 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 clas_fds sig@(ClassOpSig op dm_rdr_name explicit_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` oclose clas_fds op_ty_fvs) + (classTyVarNotInOpTyErr clas_tyvar sig) + in + mapRn_ check_in_op_ty clas_tyvars `thenRn_` + + -- Make the default-method name + getModeRn `thenRn` \ mode -> + (case mode of + SourceMode -> -- Source class decl + newImplicitBinder (mkDefaultMethodOcc (rdrNameOcc op)) locn `thenRn` \ dm_name -> + returnRn (dm_name, op `elem` meth_rdr_names, emptyFVs) + + InterfaceMode + -> -- Imported class that has a default method decl + -- See comments with tname, snames, above + lookupImplicitOccRn dm_rdr_name `thenRn` \ dm_name -> + returnRn (dm_name, explicit_dm, if explicit_dm then unitFV dm_name else emptyFVs) + -- 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 + ) `thenRn` \ (dm_name, final_explicit_dm, dm_fvs) -> + + returnRn (ClassOpSig op_name dm_name final_explicit_dm new_ty locn, op_ty_fvs `plusFV` dm_fvs) \end{code} + %********************************************************* %* * -\subsection{SPECIALIZE data pragmas} +\subsection{Instance declarations} %* * %********************************************************* \begin{code} -rnSpecDataSig :: RdrNameSpecDataSig - -> RnM_Fixes s RenamedSpecDataSig - -rnSpecDataSig (SpecDataSig tycon ty src_loc) +rnDecl (InstD (InstDecl inst_ty mbinds uprags dfun_rdr_name src_loc)) = pushSrcLocRn src_loc $ + rnHsSigType (text "an instance decl") inst_ty `thenRn` \ (inst_ty', inst_fvs) -> let - tyvars = extractMonoTyNames ty + inst_tyvars = case inst_ty' of + HsForAllTy (Just inst_tyvars) _ _ -> inst_tyvars + other -> [] + -- (Slightly strangely) the forall-d tyvars scope over + -- the method bindings too in - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env,_) -> - lookupTyCon tycon `thenRn` \ tycon' -> - rnMonoType tv_env ty `thenRn` \ ty' -> - returnRn (SpecDataSig tycon' ty' src_loc) + + -- Rename the bindings + -- NB meth_names can be qualified! + checkDupNames meth_doc meth_names `thenRn_` + extendTyVarEnvFVRn inst_tyvars ( + rnMethodBinds mbinds + ) `thenRn` \ (mbinds', meth_fvs) -> + let + binders = mkNameSet (map fst (bagToList (collectMonoBinders mbinds'))) + in + -- Rename the prags and signatures. + -- Note that the type variables are not in scope here, + -- so that instance Eq a => Eq (T a) where + -- {-# SPECIALISE instance Eq a => Eq (T [a]) #-} + -- works OK. + renameSigs (okInstDclSig binders) uprags `thenRn` \ (new_uprags, prag_fvs) -> + + getModeRn `thenRn` \ mode -> + (case mode of + InterfaceMode -> lookupImplicitOccRn dfun_rdr_name `thenRn` \ dfun_name -> + returnRn (dfun_name, unitFV dfun_name) + SourceMode -> newDFunName (getDFunKey inst_ty') src_loc + `thenRn` \ dfun_name -> + returnRn (dfun_name, emptyFVs) + ) + `thenRn` \ (dfun_name, dfun_fv) -> + + -- The typechecker checks that all the bindings are for the right class. + returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags dfun_name src_loc), + inst_fvs `plusFV` meth_fvs `plusFV` prag_fvs `plusFV` dfun_fv) + where + meth_doc = text "the bindings in an instance declaration" + meth_names = bagToList (collectMonoBinders mbinds) \end{code} %********************************************************* %* * -\subsection{Class declarations} +\subsection{Default declarations} %* * %********************************************************* -@rnClassDecl@ uses the `global name function' to create a new -class declaration in which local names have been replaced by their -original names, reporting any unknown names. - \begin{code} -rnClassDecl :: RdrNameClassDecl -> RnM_Fixes s RenamedClassDecl - -rnClassDecl (ClassDecl context cname tyvar sigs mbinds pragmas src_loc) +rnDecl (DefD (DefaultDecl tys src_loc)) = pushSrcLocRn src_loc $ - mkTyVarNamesEnv src_loc [tyvar] `thenRn` \ (tv_env, [tyvar']) -> - rnContext tv_env context `thenRn` \ context' -> - lookupClass cname `thenRn` \ cname' -> - mapRn (rn_op cname' tv_env) sigs `thenRn` \ sigs' -> - rnMethodBinds cname' mbinds `thenRn` \ mbinds' -> - ASSERT(isNoClassPragmas pragmas) - returnRn (ClassDecl context' cname' tyvar' sigs' mbinds' NoClassPragmas src_loc) + rnHsTypes doc_str tys `thenRn` \ (tys', fvs) -> + returnRn (DefD (DefaultDecl tys' src_loc), fvs) where - rn_op clas tv_env (ClassOpSig op ty pragmas locn) - = pushSrcLocRn locn $ - lookupClassOp clas op `thenRn` \ op_name -> - rnPolyType tv_env ty `thenRn` \ new_ty -> - -{- -*** Please check here that tyvar' appears in new_ty *** -*** (used to be in tcClassSig, but it's better here) -*** not_elem = isn'tIn "tcClassSigs" -*** -- Check that the class type variable is mentioned -*** checkTc (clas_tyvar `not_elem` extractTyVarTemplatesFromTy local_ty) -*** (methodTypeLacksTyVarErr clas_tyvar (_UNPK_ op_name) src_loc) `thenTc_` --} - - ASSERT(isNoClassOpPragmas pragmas) - returnRn (ClassOpSig op_name new_ty noClassOpPragmas locn) + doc_str = text "a `default' declaration" \end{code} - %********************************************************* %* * -\subsection{Instance declarations} +\subsection{Foreign declarations} %* * %********************************************************* - -@rnInstDecl@ uses the `global name function' to create a new of -instance declaration in which local names have been replaced by their -original names, reporting any unknown names. - \begin{code} -rnInstDecl :: RdrNameInstDecl -> RnM_Fixes s RenamedInstDecl - -rnInstDecl (InstDecl cname ty mbinds from_here modname uprags pragmas src_loc) +rnDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc)) = pushSrcLocRn src_loc $ - lookupClass cname `thenRn` \ cname' -> - - rnPolyType [] ty `thenRn` \ ty' -> - -- [] tv_env ensures that tyvars will be foralled - - rnMethodBinds cname' mbinds `thenRn` \ mbinds' -> - mapRn (rn_uprag cname') uprags `thenRn` \ new_uprags -> - - ASSERT(isNoInstancePragmas pragmas) - returnRn (InstDecl cname' ty' mbinds' - from_here modname new_uprags noInstancePragmas src_loc) - where - rn_uprag class_name (SpecSig op ty using locn) - = pushSrcLocRn src_loc $ - lookupClassOp class_name op `thenRn` \ op_name -> - rnPolyType nullTyVarNamesEnv ty `thenRn` \ new_ty -> - rn_using using `thenRn` \ new_using -> - returnRn (SpecSig op_name new_ty new_using locn) - - rn_uprag class_name (InlineSig op locn) - = pushSrcLocRn locn $ - lookupClassOp class_name op `thenRn` \ op_name -> - returnRn (InlineSig op_name locn) - - rn_uprag class_name (DeforestSig op locn) - = pushSrcLocRn locn $ - lookupClassOp class_name op `thenRn` \ op_name -> - returnRn (DeforestSig op_name locn) - - rn_uprag class_name (MagicUnfoldingSig op str locn) - = pushSrcLocRn locn $ - lookupClassOp class_name op `thenRn` \ op_name -> - returnRn (MagicUnfoldingSig op_name str locn) - - rn_using Nothing - = returnRn Nothing - rn_using (Just v) - = lookupValue v `thenRn` \ new_v -> - returnRn (Just new_v) + lookupOccRn name `thenRn` \ name' -> + let + extra_fvs FoExport + | isDyn = lookupImplicitOccsRn [makeStablePtr_RDR, deRefStablePtr_RDR, bindIO_RDR] + | otherwise = returnRn (unitFV name') + extra_fvs other = returnRn emptyFVs + in + checkRn (ok_ext_nm ext_nm) (badExtName ext_nm) `thenRn_` + extra_fvs imp_exp `thenRn` \ fvs1 -> + rnHsSigType fo_decl_msg ty `thenRn` \ (ty', fvs2) -> + returnRn (ForD (ForeignDecl name' imp_exp ty' ext_nm cconv src_loc), + fvs1 `plusFV` fvs2) + where + fo_decl_msg = ptext SLIT("a foreign declaration") + isDyn = isDynamicExtName ext_nm + + ok_ext_nm Dynamic = True + ok_ext_nm (ExtName nm (Just mb)) = isCLabelString nm && isCLabelString mb + ok_ext_nm (ExtName nm Nothing) = isCLabelString nm \end{code} %********************************************************* %* * -\subsection{@SPECIALIZE instance@ user-pragmas} +\subsection{Rules} %* * %********************************************************* \begin{code} -rnSpecInstSig :: RdrNameSpecInstSig - -> RnM_Fixes s RenamedSpecInstSig - -rnSpecInstSig (SpecInstSig clas ty src_loc) - = pushSrcLocRn src_loc $ +rnDecl (RuleD (IfaceRule rule_name vars fn args rhs src_loc)) + = pushSrcLocRn src_loc $ + lookupOccRn fn `thenRn` \ fn' -> + rnCoreBndrs vars $ \ vars' -> + mapFvRn rnCoreExpr args `thenRn` \ (args', fvs1) -> + rnCoreExpr rhs `thenRn` \ (rhs', fvs2) -> + returnRn (RuleD (IfaceRule rule_name vars' fn' args' rhs' src_loc), + (fvs1 `plusFV` fvs2) `addOneFV` fn') + +rnDecl (RuleD (IfaceRuleOut fn rule)) + -- This one is used for BuiltInRules + -- The rule itself is already done, but the thing + -- to attach it to is not. + = lookupOccRn fn `thenRn` \ fn' -> + returnRn (RuleD (IfaceRuleOut fn' rule), unitFV fn') + +rnDecl (RuleD (HsRule rule_name tvs vars lhs rhs src_loc)) + = ASSERT( null tvs ) + pushSrcLocRn src_loc $ + + bindTyVarsFV2Rn doc (map UserTyVar sig_tvs) $ \ sig_tvs' _ -> + bindLocalsFVRn doc (map get_var vars) $ \ ids -> + mapFvRn rn_var (vars `zip` ids) `thenRn` \ (vars', fv_vars) -> + + rnExpr lhs `thenRn` \ (lhs', fv_lhs) -> + rnExpr rhs `thenRn` \ (rhs', fv_rhs) -> + checkRn (validRuleLhs ids lhs') + (badRuleLhsErr rule_name lhs') `thenRn_` let - tyvars = extractMonoTyNames ty + bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)] in - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env,_) -> - lookupClass clas `thenRn` \ new_clas -> - rnMonoType tv_env ty `thenRn` \ new_ty -> - returnRn (SpecInstSig new_clas new_ty src_loc) + mapRn (addErrRn . badRuleVar rule_name) bad_vars `thenRn_` + returnRn (RuleD (HsRule rule_name sig_tvs' vars' lhs' rhs' src_loc), + fv_vars `plusFV` fv_lhs `plusFV` fv_rhs) + where + doc = text "the transformation rule" <+> ptext rule_name + sig_tvs = extractRuleBndrsTyVars vars + + get_var (RuleBndr v) = v + get_var (RuleBndrSig v _) = v + + rn_var (RuleBndr v, id) = returnRn (RuleBndr id, emptyFVs) + rn_var (RuleBndrSig v t, id) = rnHsType doc t `thenRn` \ (t', fvs) -> + returnRn (RuleBndrSig id t', fvs) \end{code} + %********************************************************* %* * -\subsection{Default declarations} +\subsection{Support code for type/data declarations} %* * %********************************************************* -@rnDefaultDecl@ uses the `global name function' to create a new set -of default declarations in which local names have been replaced by -their original names, reporting any unknown names. - \begin{code} -rnDefaultDecl :: [RdrNameDefaultDecl] -> RnM_Fixes s [RenamedDefaultDecl] +rnDerivs :: Maybe [RdrName] -> RnMS (Maybe [Name], FreeVars) -rnDefaultDecl [] = returnRn [] -rnDefaultDecl [DefaultDecl tys src_loc] - = pushSrcLocRn src_loc $ - mapRn (rnMonoType nullTyVarNamesEnv) tys `thenRn` \ tys' -> - returnRn [DefaultDecl tys' src_loc] -rnDefaultDecl defs@(d:ds) - = addErrRn (dupDefaultDeclErr defs) `thenRn_` - rnDefaultDecl [d] -\end{code} +rnDerivs Nothing -- derivs not specified + = returnRn (Nothing, emptyFVs) -%************************************************************************* -%* * -\subsection{Fixity declarations} -%* * -%************************************************************************* +rnDerivs (Just clss) + = mapRn do_one clss `thenRn` \ clss' -> + returnRn (Just clss', mkNameSet clss') + where + do_one cls = lookupOccRn cls `thenRn` \ clas_name -> + checkRn (getUnique clas_name `elem` derivableClassKeys) + (derivingNonStdClassErr clas_name) `thenRn_` + returnRn clas_name +\end{code} \begin{code} -rnFixes :: [RdrNameFixityDecl] -> RnM s [RenamedFixityDecl] +conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc) +conDeclName (ConDecl n _ _ _ _ l) = (n,l) + +rnConDecl :: RdrNameConDecl -> RnMS (RenamedConDecl, FreeVars) +rnConDecl (ConDecl name wkr tvs cxt details locn) + = pushSrcLocRn locn $ + checkConName name `thenRn_` + lookupBndrRn name `thenRn` \ new_name -> + + mkImportedGlobalFromRdrName wkr `thenRn` \ new_wkr -> + -- See comments with ClassDecl + + 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_wkr new_tyvars new_context new_details locn, + cxt_fvs `plusFV` det_fvs) + where + doc = text "the definition of data constructor" <+> quotes (ppr name) -rnFixes fixities - = mapRn rn_fixity fixities `thenRn` \ fixes_maybe -> - returnRn (catMaybes fixes_maybe) +rnConDetails doc locn (VanillaCon tys) + = mapFvRn (rnBangTy doc) tys `thenRn` \ (new_tys, fvs) -> + returnRn (VanillaCon new_tys, fvs) + +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_` + mapFvRn (rnField doc) fields `thenRn` \ (new_fields, fvs) -> + returnRn (RecCon new_fields, fvs) where - rn_fixity fix@(InfixL name i) - = rn_fixity_pieces InfixL name i fix - rn_fixity fix@(InfixR name i) - = rn_fixity_pieces InfixR name i fix - rn_fixity fix@(InfixN name i) - = rn_fixity_pieces InfixN name i fix - - rn_fixity_pieces mk_fixity name i fix - = lookupValueMaybe name `thenRn` \ maybe_res -> - case maybe_res of - Just res | isLocallyDefined res - -> returnRn (Just (mk_fixity res i)) - _ -> failButContinueRn Nothing (undefinedFixityDeclErr fix) - + field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds] + +rnField doc (names, ty) + = mapRn lookupBndrRn names `thenRn` \ new_names -> + rnBangTy doc ty `thenRn` \ (new_ty, fvs) -> + returnRn ((new_names, new_ty), fvs) + +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) + +-- 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 + +checkConName name + = checkRn (isRdrDataCon name) + (badDataCon name) \end{code} + %********************************************************* %* * \subsection{Support code to rename types} @@ -411,100 +533,462 @@ rnFixes fixities %********************************************************* \begin{code} -rnPolyType :: TyVarNamesEnv - -> RdrNamePolyType - -> RnM_Fixes s RenamedPolyType +rnHsSigType :: SDoc -> RdrNameHsType -> RnMS (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 + +--------------------------------------- +rnHsType :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars) + +rnHsType doc (HsForAllTy Nothing ctxt ty) + -- Implicit quantifiction in source code (no kinds on tyvars) + -- Given the signature C => T we universally quantify + -- over FV(T) \ {in-scope-tyvars} + = getLocalNameEnv `thenRn` \ name_env -> + let + mentioned_in_tau = extractHsTyRdrTyVars ty + forall_tyvars = filter (not . (`elemFM` name_env)) mentioned_in_tau + in + checkConstraints doc forall_tyvars mentioned_in_tau ctxt ty `thenRn` \ ctxt' -> + rnForAll doc (map UserTyVar forall_tyvars) ctxt' ty + +rnHsType doc (HsForAllTy (Just forall_tyvars) ctxt tau) + -- Explicit quantification. + -- Check that the forall'd tyvars are 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_in_tau = extractHsTyRdrTyVars tau + mentioned_in_ctxt = nub [tv | p <- ctxt, + ty <- tys_of_pred p, + tv <- extractHsTyRdrTyVars ty] + tys_of_pred (HsPClass clas tys) = tys + tys_of_pred (HsPIParam n ty) = [ty] + + dubious_guys = filter (`notElem` mentioned_in_tau) forall_tyvar_names + -- dubious = explicitly quantified but not mentioned in tau type + + (bad_guys, warn_guys) = partition (`elem` mentioned_in_ctxt) dubious_guys + -- bad = explicitly quantified and constrained, but not mentioned in tau + -- warn = explicitly quantified but not mentioned in ctxt or tau + + forall_tyvar_names = map getTyVarName forall_tyvars + in + -- mapRn_ (forAllErr doc tau) bad_guys `thenRn_` + mapRn_ (forAllWarn doc tau) warn_guys `thenRn_` + checkConstraints doc forall_tyvar_names mentioned_in_tau ctxt tau `thenRn` \ ctxt' -> + rnForAll doc forall_tyvars ctxt' tau + +rnHsType doc (HsTyVar tyvar) + = lookupOccRn tyvar `thenRn` \ tyvar' -> + returnRn (HsTyVar tyvar', unitFV tyvar') + +rnHsType doc (HsFunTy ty1 ty2) + = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) -> + -- Might find a for-all as the arg of a function type + rnHsType doc ty2 `thenRn` \ (ty2', fvs2) -> + -- Or as the result. This happens when reading Prelude.hi + -- when we find return :: forall m. Monad m -> forall a. a -> m a + returnRn (HsFunTy ty1' ty2', fvs1 `plusFV` fvs2) + +rnHsType doc (HsListTy ty) + = rnHsType doc ty `thenRn` \ (ty', fvs) -> + returnRn (HsListTy ty', fvs `addOneFV` listTyCon_name) + +-- Unboxed tuples are allowed to have poly-typed arguments. These +-- sometimes crop up as a result of CPR worker-wrappering dictionaries. +rnHsType doc (HsTupleTy (HsTupCon _ boxity) tys) + -- Don't do lookupOccRn, because this is built-in syntax + -- so it doesn't need to be in scope + = mapFvRn (rnHsType doc) tys `thenRn` \ (tys', fvs) -> + returnRn (HsTupleTy (HsTupCon n' boxity) tys', fvs `addOneFV` n') + where + n' = tupleTyCon_name boxity (length tys) + + +rnHsType doc (HsAppTy ty1 ty2) + = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) -> + rnHsType doc ty2 `thenRn` \ (ty2', fvs2) -> + returnRn (HsAppTy ty1' ty2', fvs1 `plusFV` fvs2) + +rnHsType doc (HsPredTy pred) + = rnPred doc pred `thenRn` \ (pred', fvs) -> + returnRn (HsPredTy pred', fvs) + +rnHsType doc (HsUsgForAllTy uv_rdr ty) + = bindUVarRn doc uv_rdr $ \ uv_name -> + rnHsType doc ty `thenRn` \ (ty', fvs) -> + returnRn (HsUsgForAllTy uv_name ty', + fvs ) + +rnHsType doc (HsUsgTy usg ty) + = newUsg usg `thenRn` \ (usg', usg_fvs) -> + rnHsType doc ty `thenRn` \ (ty', ty_fvs) -> + -- A for-all can occur inside a usage annotation + returnRn (HsUsgTy usg' ty', + usg_fvs `plusFV` ty_fvs) + where + newUsg usg = case usg of + HsUsOnce -> returnRn (HsUsOnce, emptyFVs) + HsUsMany -> returnRn (HsUsMany, emptyFVs) + HsUsVar uv_rdr -> lookupOccRn uv_rdr `thenRn` \ uv_name -> + returnRn (HsUsVar uv_name, emptyFVs) + +rnHsTypes doc tys = mapFvRn (rnHsType doc) tys +\end{code} -rnPolyType tv_env (HsForAllTy tvs ctxt ty) - = rn_poly_help tv_env tvs ctxt ty +\begin{code} +-- We use lookupOcc here because this is interface file only stuff +-- and we need the workers... +rnHsTupCon (HsTupCon n boxity) + = lookupOccRn n `thenRn` \ n' -> + returnRn (HsTupCon n' boxity, unitFV n') + +rnHsTupConWkr (HsTupCon n boxity) + -- Tuple construtors are for the *worker* of the tuple + -- Going direct saves needless messing about + = lookupOccRn (mkRdrNameWkr n) `thenRn` \ n' -> + returnRn (HsTupCon n' boxity, unitFV n') +\end{code} -rnPolyType tv_env poly_ty@(HsPreForAllTy ctxt ty) - = rn_poly_help tv_env forall_tyvars ctxt ty +\begin{code} +-- 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 doc forall_tyvars tau_vars ctxt ty + = mapRn (checkPred doc forall_tyvars ty) ctxt `thenRn` \ maybe_ctxt' -> + returnRn (catMaybes maybe_ctxt') + -- Remove problem ones, to avoid duplicate error message. + +checkPred doc forall_tyvars ty p@(HsPClass clas tys) + | not_univ = failWithRn Nothing (univErr doc p ty) + | otherwise = returnRn (Just p) where - mentioned_tyvars = extract_poly_ty_names poly_ty - forall_tyvars = mentioned_tyvars `minusList` domTyVarNamesEnv tv_env - ------------- -extract_poly_ty_names (HsPreForAllTy ctxt ty) - = extractCtxtTyNames ctxt - `unionLists` - extractMonoTyNames ty - ------------- -rn_poly_help :: TyVarNamesEnv - -> [RdrName] - -> RdrNameContext - -> RdrNameMonoType - -> RnM_Fixes s RenamedPolyType - -rn_poly_help tv_env tyvars ctxt ty - = getSrcLocRn `thenRn` \ src_loc -> - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env1, new_tyvars) -> + ct_vars = extractHsTysRdrTyVars tys + not_univ = -- At least one of the tyvars in each constraint must + -- be universally quantified. This restriction isn't in Hugs + not (any (`elem` forall_tyvars) ct_vars) +checkPred doc forall_tyvars ty p@(HsPIParam _ _) + = returnRn (Just p) + +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 (Just new_tyvars) new_ctxt new_ty, + cxt_fvs `plusFV` ty_fvs) +\end{code} + +\begin{code} +rnContext :: SDoc -> RdrNameContext -> RnMS (RenamedContext, FreeVars) +rnContext doc ctxt + = mapAndUnzipRn rn_pred ctxt `thenRn` \ (theta, fvs_s) -> let - tv_env2 = catTyVarNamesEnvs tv_env1 tv_env + (_, dups) = removeDupsEq theta + -- We only have equality, not ordering in - rnContext tv_env2 ctxt `thenRn` \ new_ctxt -> - rnMonoType tv_env2 ty `thenRn` \ new_ty -> - returnRn (HsForAllTy new_tyvars new_ctxt new_ty) + -- Check for duplicate assertions + -- If this isn't an error, then it ought to be: + mapRn (addWarnRn . dupClassAssertWarn theta) dups `thenRn_` + returnRn (theta, plusFVs fvs_s) + where + --Someone discovered that @CCallable@ and @CReturnable@ + -- could be used in contexts such as: + -- foo :: CCallable a => a -> PrimIO Int + -- Doing this utterly wrecks the whole point of introducing these + -- classes so we specifically check that this isn't being done. + rn_pred pred = rnPred doc pred `thenRn` \ (pred', fvs)-> + checkRn (not (bad_pred pred')) + (naughtyCCallContextErr pred') `thenRn_` + returnRn (pred', fvs) + + bad_pred (HsPClass clas _) = getUnique clas `elem` cCallishClassKeys + bad_pred other = False + + +rnPred doc (HsPClass clas tys) + = lookupOccRn clas `thenRn` \ clas_name -> + rnHsTypes doc tys `thenRn` \ (tys', fvs) -> + returnRn (HsPClass clas_name tys', fvs `addOneFV` clas_name) + +rnPred doc (HsPIParam n ty) + = getIPName n `thenRn` \ name -> + rnHsType doc ty `thenRn` \ (ty', fvs) -> + returnRn (HsPIParam name ty', fvs) \end{code} \begin{code} -rnMonoType :: TyVarNamesEnv - -> RdrNameMonoType - -> RnM_Fixes s RenamedMonoType +rnFds :: SDoc -> [FunDep RdrName] -> RnMS ([FunDep Name], FreeVars) -rnMonoType tv_env (MonoTyVar tyvar) - = lookupTyVarName tv_env tyvar `thenRn` \ tyvar' -> - returnRn (MonoTyVar tyvar') +rnFds doc fds + = mapAndUnzipRn rn_fds fds `thenRn` \ (theta, fvs_s) -> + returnRn (theta, plusFVs fvs_s) + where + rn_fds (tys1, tys2) + = rnHsTyVars doc tys1 `thenRn` \ (tys1', fvs1) -> + rnHsTyVars doc tys2 `thenRn` \ (tys2', fvs2) -> + returnRn ((tys1', tys2'), fvs1 `plusFV` fvs2) + +rnHsTyVars doc tvs = mapFvRn (rnHsTyvar doc) tvs +rnHsTyvar doc tyvar + = lookupOccRn tyvar `thenRn` \ tyvar' -> + returnRn (tyvar', unitFV tyvar') +\end{code} -rnMonoType tv_env (MonoListTy ty) - = rnMonoType tv_env ty `thenRn` \ ty' -> - returnRn (MonoListTy ty') +%********************************************************* +%* * +\subsection{IdInfo} +%* * +%********************************************************* -rnMonoType tv_env (MonoFunTy ty1 ty2) - = andRn MonoFunTy (rnMonoType tv_env ty1) - (rnMonoType tv_env ty2) +\begin{code} +rnIdInfo (HsStrictness str) = returnRn (HsStrictness str, emptyFVs) -rnMonoType tv_env (MonoTupleTy tys) - = mapRn (rnMonoType tv_env) tys `thenRn` \ tys' -> - returnRn (MonoTupleTy tys') +rnIdInfo (HsWorker worker) + = lookupOccRn worker `thenRn` \ worker' -> + returnRn (HsWorker worker', unitFV worker') + +rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ (expr', fvs) -> + returnRn (HsUnfold inline expr', fvs) +rnIdInfo (HsArity arity) = returnRn (HsArity arity, emptyFVs) +rnIdInfo (HsUpdate update) = returnRn (HsUpdate update, emptyFVs) +rnIdInfo HsNoCafRefs = returnRn (HsNoCafRefs, emptyFVs) +rnIdInfo HsCprInfo = returnRn (HsCprInfo, emptyFVs) -rnMonoType tv_env (MonoTyApp name tys) - = let - lookup_fn = if isAvarid (getLocalName name) - then lookupTyVarName tv_env - else lookupTyCon - in - lookup_fn name `thenRn` \ name' -> - mapRn (rnMonoType tv_env) tys `thenRn` \ tys' -> - returnRn (MonoTyApp name' tys') \end{code} -\begin{code} -rnContext :: TyVarNamesEnv -> RdrNameContext -> RnM_Fixes s RenamedContext +@UfCore@ expressions. -rnContext tv_env ctxt - = mapRn rn_ctxt ctxt +\begin{code} +rnCoreExpr (UfType ty) + = rnHsType (text "unfolding type") ty `thenRn` \ (ty', fvs) -> + returnRn (UfType ty', fvs) + +rnCoreExpr (UfVar v) + = lookupOccRn v `thenRn` \ v' -> + returnRn (UfVar v', unitFV v') + +rnCoreExpr (UfLit l) + = returnRn (UfLit l, emptyFVs) + +rnCoreExpr (UfLitLit l ty) + = rnHsType (text "litlit") ty `thenRn` \ (ty', fvs) -> + returnRn (UfLitLit l ty', fvs) + +rnCoreExpr (UfCCall cc ty) + = rnHsType (text "ccall") ty `thenRn` \ (ty', fvs) -> + returnRn (UfCCall cc ty', fvs) + +rnCoreExpr (UfTuple con args) + = rnHsTupConWkr con `thenRn` \ (con', fvs1) -> + mapFvRn rnCoreExpr args `thenRn` \ (args', fvs2) -> + returnRn (UfTuple con' args', fvs1 `plusFV` fvs2) + +rnCoreExpr (UfApp fun arg) + = rnCoreExpr fun `thenRn` \ (fun', fv1) -> + rnCoreExpr arg `thenRn` \ (arg', fv2) -> + returnRn (UfApp fun' arg', fv1 `plusFV` fv2) + +rnCoreExpr (UfCase scrut bndr alts) + = rnCoreExpr scrut `thenRn` \ (scrut', fvs1) -> + bindCoreLocalFVRn bndr ( \ bndr' -> + mapFvRn rnCoreAlt alts `thenRn` \ (alts', fvs2) -> + returnRn (UfCase scrut' bndr' alts', fvs2) + ) `thenRn` \ (case', fvs3) -> + returnRn (case', fvs1 `plusFV` fvs3) + +rnCoreExpr (UfNote note expr) + = rnNote note `thenRn` \ (note', fvs1) -> + rnCoreExpr expr `thenRn` \ (expr', fvs2) -> + returnRn (UfNote note' expr', fvs1 `plusFV` fvs2) + +rnCoreExpr (UfLam bndr body) + = rnCoreBndr bndr $ \ bndr' -> + rnCoreExpr body `thenRn` \ (body', fvs) -> + returnRn (UfLam bndr' body', fvs) + +rnCoreExpr (UfLet (UfNonRec bndr rhs) body) + = rnCoreExpr rhs `thenRn` \ (rhs', fvs1) -> + rnCoreBndr bndr ( \ bndr' -> + rnCoreExpr body `thenRn` \ (body', fvs2) -> + returnRn (UfLet (UfNonRec bndr' rhs') body', fvs2) + ) `thenRn` \ (result, fvs3) -> + returnRn (result, fvs1 `plusFV` fvs3) + +rnCoreExpr (UfLet (UfRec pairs) body) + = rnCoreBndrs bndrs $ \ bndrs' -> + mapFvRn rnCoreExpr rhss `thenRn` \ (rhss', fvs1) -> + rnCoreExpr body `thenRn` \ (body', fvs2) -> + returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body', fvs1 `plusFV` fvs2) where - rn_ctxt (clas, tyvar) - = lookupClass clas `thenRn` \ clas_name -> - lookupTyVarName tv_env tyvar `thenRn` \ tyvar_name -> - returnRn (clas_name, tyvar_name) + (bndrs, rhss) = unzip pairs \end{code} +\begin{code} +rnCoreBndr (UfValBinder name ty) thing_inside + = rnHsType doc ty `thenRn` \ (ty', fvs1) -> + bindCoreLocalFVRn name ( \ name' -> + thing_inside (UfValBinder name' ty') + ) `thenRn` \ (result, fvs2) -> + returnRn (result, fvs1 `plusFV` fvs2) + where + doc = text "unfolding id" + +rnCoreBndr (UfTyBinder name kind) thing_inside + = bindCoreLocalFVRn name $ \ name' -> + thing_inside (UfTyBinder name' kind) + +rnCoreBndrs [] thing_inside = thing_inside [] +rnCoreBndrs (b:bs) thing_inside = rnCoreBndr b $ \ name' -> + rnCoreBndrs bs $ \ names' -> + thing_inside (name':names') +\end{code} \begin{code} -derivingNonStdClassErr clas locn sty - = ppHang (ppStr "Non-standard class in deriving") - 4 (ppCat [ppr sty clas, ppr sty locn]) +rnCoreAlt (con, bndrs, rhs) + = rnUfCon con bndrs `thenRn` \ (con', fvs1) -> + bindCoreLocalsFVRn bndrs ( \ bndrs' -> + rnCoreExpr rhs `thenRn` \ (rhs', fvs2) -> + returnRn ((con', bndrs', rhs'), fvs2) + ) `thenRn` \ (result, fvs3) -> + returnRn (result, fvs1 `plusFV` fvs3) + +rnNote (UfCoerce ty) + = rnHsType (text "unfolding coerce") ty `thenRn` \ (ty', fvs) -> + returnRn (UfCoerce ty', fvs) + +rnNote (UfSCC cc) = returnRn (UfSCC cc, emptyFVs) +rnNote UfInlineCall = returnRn (UfInlineCall, emptyFVs) +rnNote UfInlineMe = returnRn (UfInlineMe, emptyFVs) + -dupDefaultDeclErr defs sty - = ppHang (ppStr "Duplicate default declarations") - 4 (ppAboves (map pp_def_loc defs)) +rnUfCon UfDefault _ + = returnRn (UfDefault, emptyFVs) + +rnUfCon (UfTupleAlt tup_con) bndrs + = rnHsTupCon tup_con `thenRn` \ (HsTupCon con' _, fvs) -> + returnRn (UfDataAlt con', fvs) + -- Makes the type checker a little easier + +rnUfCon (UfDataAlt con) _ + = lookupOccRn con `thenRn` \ con' -> + returnRn (UfDataAlt con', unitFV con') + +rnUfCon (UfLitAlt lit) _ + = returnRn (UfLitAlt lit, emptyFVs) + +rnUfCon (UfLitLitAlt lit ty) _ + = rnHsType (text "litlit") ty `thenRn` \ (ty', fvs) -> + returnRn (UfLitLitAlt lit ty', fvs) +\end{code} + +%********************************************************* +%* * +\subsection{Rule shapes} +%* * +%********************************************************* + +Check the shape of a transformation rule LHS. Currently +we only allow LHSs of the form @(f e1 .. en)@, where @f@ is +not one of the @forall@'d variables. + +\begin{code} +validRuleLhs foralls lhs + = check lhs where - pp_def_loc (DefaultDecl _ src_loc) = ppr sty src_loc + check (HsApp e1 e2) = check e1 + check (HsVar v) | v `notElem` foralls = True + check other = False +\end{code} + -undefinedFixityDeclErr decl sty - = ppHang (ppStr "Fixity declaration for unknown operator") - 4 (ppr sty decl) +%********************************************************* +%* * +\subsection{Errors} +%* * +%********************************************************* + +\begin{code} +derivingNonStdClassErr clas + = hsep [ptext SLIT("non-standard class"), ppr clas, ptext SLIT("in deriving clause")] + +classTyVarNotInOpTyErr clas_tyvar sig + = hang (hsep [ptext SLIT("Class type variable"), + quotes (ppr clas_tyvar), + ptext SLIT("does not appear in method signature")]) + 4 (ppr sig) + +badDataCon name + = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)] + +forAllWarn doc ty tyvar + | not opt_WarnUnusedMatches = returnRn () + | otherwise + = getModeRn `thenRn` \ mode -> + case mode of { +#ifndef DEBUG + InterfaceMode -> returnRn () ; -- Don't warn of unused tyvars in interface files + -- unless DEBUG is on, in which case it is slightly + -- informative. They can arise from mkRhsTyLam, +#endif -- leading to (say) f :: forall a b. [b] -> [b] + other -> + + addWarnRn ( + sep [ptext SLIT("The universally quantified type variable") <+> quotes (ppr tyvar), + nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))] + $$ + (ptext SLIT("In") <+> doc)) + } + +forAllErr doc ty tyvar + = addErrRn ( + sep [ptext SLIT("The constrained type variable") <+> quotes (ppr tyvar), + nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))] + $$ + (ptext SLIT("In") <+> doc)) + +univErr doc constraint ty + = sep [ptext SLIT("All of the type variable(s) in the constraint") + <+> quotes (ppr constraint) + <+> ptext SLIT("are already in scope"), + nest 4 (ptext SLIT("At least one must be universally quantified here")) + ] + $$ + (ptext SLIT("In") <+> doc) + +ambigErr doc constraint ty + = sep [ptext SLIT("Ambiguous constraint") <+> quotes (ppr constraint), + nest 4 (ptext SLIT("in the type:") <+> ppr ty), + nest 4 (ptext SLIT("Each forall-d type variable mentioned by the constraint must appear after the =>."))] + $$ + (ptext SLIT("In") <+> doc) + +badRuleLhsErr name lhs + = sep [ptext SLIT("Rule") <+> ptext name <> colon, + nest 4 (ptext SLIT("Illegal left-hand side:") <+> ppr lhs)] + $$ + ptext SLIT("LHS must be of form (f e1 .. en) where f is not forall'd") + +badRuleVar name var + = sep [ptext SLIT("Rule") <+> ptext name <> colon, + ptext SLIT("Forall'd variable") <+> quotes (ppr var) <+> + ptext SLIT("does not appear on left hand side")] + +badExtName :: ExtName -> Message +badExtName ext_nm + = sep [quotes (ppr ext_nm) <+> ptext SLIT("is not a valid C identifier")] + +dupClassAssertWarn ctxt (assertion : dups) + = sep [hsep [ptext SLIT("Duplicate class assertion"), + quotes (ppr assertion), + ptext SLIT("in the context:")], + nest 4 (ppr ctxt <+> ptext SLIT("..."))] + +naughtyCCallContextErr (HsPClass clas _) + = sep [ptext SLIT("Can't use class") <+> quotes (ppr clas), + ptext SLIT("in a context")] \end{code}