X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnSource.lhs;h=f74c71244e1309bda2020269a6685577dcf6042a;hb=715184e20183fbdc71383cbc0b1e07598c91b165;hp=89e484d98e072a559439aa8f7345ba5045444d44;hpb=ffe3daa2cebacc56878467a8ee09602712ff5dee;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnSource.lhs b/ghc/compiler/rename/RnSource.lhs index 89e484d..f74c712 100644 --- a/ghc/compiler/rename/RnSource.lhs +++ b/ghc/compiler/rename/RnSource.lhs @@ -1,227 +1,352 @@ % -% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996 +% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998 % \section[RnSource]{Main pass of renamer} \begin{code} -module RnSource ( rnDecl, rnHsType, rnHsSigType ) where +module RnSource ( + rnSrcDecls, checkModDeprec, + rnTyClDecl, rnIfaceRuleDecl, rnInstDecl, + rnBinds, rnBindsAndThen, rnStats, + ) where #include "HsVersions.h" -import RnExpr import HsSyn -import HsDecls ( HsIdInfo(..), HsStrictnessInfo(..) ) -import HsPragmas -import HsTypes ( getTyVarName, pprClassAssertion, cmpHsTypes ) -import RdrHsSyn +import RdrName ( RdrName, isRdrDataCon, elemRdrEnv ) +import RdrHsSyn ( RdrNameConDecl, RdrNameTyClDecl, + RdrNameDeprecation, RdrNameFixitySig, + RdrNameHsBinds, + extractGenericPatTyVars + ) import RnHsSyn import HsCore -import CmdLineOpts ( opt_IgnoreIfacePragmas ) - -import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs ) -import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn, lookupImplicitOccRn, bindLocalsRn, - newDfunName, checkDupOrQualNames, checkDupNames, lookupGlobalOccRn, - newLocallyDefinedGlobalName, newImportedGlobalName, ifaceFlavour, - listType_RDR, tupleType_RDR, addImplicitOccRn +import RnExpr ( rnExpr ) +import RnTypes ( rnHsType, rnHsSigType, rnHsTypeFVs, rnContext ) + +import RnBinds ( rnTopMonoBinds, rnMonoBinds, rnMethodBinds, + rnMonoBindsAndThen, renameSigs, checkSigs ) +import RnEnv ( lookupTopBndrRn, lookupOccRn, lookupSysBndr, + newLocalsRn, lookupGlobalOccRn, + bindLocalsFV, bindPatSigTyVarsFV, + bindTyVarsRn, extendTyVarEnvFVRn, + bindCoreLocalRn, bindCoreLocalsRn, bindLocalNames, + checkDupOrQualNames, checkDupNames, mapFvRn, + lookupTopSrcBndr_maybe, lookupTopSrcBndr, + dataTcOccs, newIPName, unknownNameErr ) -import RnMonad - -import Name ( Name, OccName(..), occNameString, prefixOccName, - ExportFlag(..), Provenance(..), NameSet, mkNameSet, - elemNameSet, nameOccName, NamedThing(..) +import TcRnMonad + +import BasicTypes ( FixitySig(..), TopLevelFlag(..) ) +import HscTypes ( ExternalPackageState(..), FixityEnv, + Deprecations(..), plusDeprecs ) +import Module ( moduleEnvElts ) +import Class ( FunDep, DefMeth (..) ) +import TyCon ( DataConDetails(..), visibleDataCons ) +import Name ( Name ) +import NameSet +import NameEnv +import ErrUtils ( dumpIfSet ) +import PrelNames ( newStablePtrName, bindIOName, returnIOName + -- dotnet interop + , objectTyConName, + , unmarshalObjectName, marshalObjectName + , unmarshalStringName, marshalStringName + , checkDotnetResName ) -import BasicTypes ( TopLevelFlag(..) ) -import FiniteMap ( lookupFM ) -import Id ( GenId{-instance NamedThing-} ) -import IdInfo ( FBTypeInfo, ArgUsageInfo ) -import Lex ( isLexCon ) -import PrelInfo ( derivingOccurrences, evalClass_RDR, numClass_RDR, allClass_NAME ) -import Maybes ( maybeToBool ) +import List ( partition ) import Bag ( bagToList ) import Outputable import SrcLoc ( SrcLoc ) -import Unique ( Unique ) -import UniqSet ( UniqSet ) -import UniqFM ( UniqFM, lookupUFM ) -import Util -import List ( partition, nub ) +import CmdLineOpts ( DynFlag(..) ) + -- Warn of unused for-all'd tyvars +import Maybes ( maybeToBool, seqMaybe ) +import Maybe ( maybe, catMaybes, isNothing ) \end{code} -rnDecl `renames' declarations. +@rnSourceDecl@ `renames' declarations. It simultaneously performs dependency analysis and precedence parsing. It also does the following error checks: \begin{enumerate} \item Checks that tyvars are used properly. This includes checking for undefined tyvars, and tyvars in contexts that are ambiguous. +(Some of this checking has now been moved to module @TcMonoType@, +since we don't have functional dependency information at this point.) \item Checks that all variable occurences are defined. \item -Checks the (..) etc constraints in the export list. +Checks the @(..)@ etc constraints in the export list. \end{enumerate} +\begin{code} +rnSrcDecls :: HsGroup RdrName -> RnM (TcGblEnv, HsGroup Name, DefUses) + +rnSrcDecls (HsGroup { hs_valds = MonoBind binds sigs _, + hs_tyclds = tycl_decls, + hs_instds = inst_decls, + hs_fixds = fix_decls, + hs_depds = deprec_decls, + hs_fords = foreign_decls, + hs_defds = default_decls, + hs_ruleds = rule_decls, + hs_coreds = core_decls }) + + = do { -- Deal with deprecations (returns only the extra deprecations) + deprecs <- rnSrcDeprecDecls deprec_decls ; + updGblEnv (\gbl -> gbl { tcg_deprecs = tcg_deprecs gbl `plusDeprecs` deprecs }) + $ do { + + -- Deal with top-level fixity decls + -- (returns the total new fixity env) + fix_env <- rnSrcFixityDecls fix_decls ; + updGblEnv (\gbl -> gbl { tcg_fix_env = fix_env }) + $ do { + + -- Rename other declarations + (rn_val_decls, bind_dus) <- rnTopMonoBinds binds sigs ; + + -- You might think that we could build proper def/use information + -- for type and class declarations, but they can be involved + -- in mutual recursion across modules, and we only do the SCC + -- analysis for them in the type checker. + -- So we content ourselves with gathering uses only; that + -- means we'll only report a declaration as unused if it isn't + -- mentioned at all. Ah well. + (rn_tycl_decls, src_fvs1) <- mapFvRn rnSrcTyClDecl tycl_decls ; + (rn_inst_decls, src_fvs2) <- mapFvRn rnSrcInstDecl inst_decls ; + (rn_rule_decls, src_fvs3) <- mapFvRn rnHsRuleDecl rule_decls ; + (rn_foreign_decls, src_fvs4) <- mapFvRn rnHsForeignDecl foreign_decls ; + (rn_default_decls, src_fvs5) <- mapFvRn rnDefaultDecl default_decls ; + (rn_core_decls, src_fvs6) <- mapFvRn rnCoreDecl core_decls ; + + let { + rn_group = HsGroup { hs_valds = rn_val_decls, + hs_tyclds = rn_tycl_decls, + hs_instds = rn_inst_decls, + hs_fixds = [], + hs_depds = [], + hs_fords = rn_foreign_decls, + hs_defds = rn_default_decls, + hs_ruleds = rn_rule_decls, + hs_coreds = rn_core_decls } ; + + other_fvs = plusFVs [src_fvs1, src_fvs2, src_fvs3, + src_fvs4, src_fvs5, src_fvs6] ; + src_dus = bind_dus `plusDU` usesOnly other_fvs + } ; + + tcg_env <- getGblEnv ; + return (tcg_env, rn_group, src_dus) + }}} +\end{code} + + %********************************************************* -%* * -\subsection{Value declarations} -%* * +%* * + Source-code fixity declarations +%* * %********************************************************* \begin{code} -rnDecl :: RdrNameHsDecl -> RnMS s RenamedHsDecl +rnSrcFixityDecls :: [RdrNameFixitySig] -> TcRn m FixityEnv +rnSrcFixityDecls fix_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 + +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 -> - returnRn (ValD new_binds) +%********************************************************* +%* * + Source-code deprecations declarations +%* * +%********************************************************* -rnDecl (SigD (IfaceSig name ty id_infos loc)) - = pushSrcLocRn loc $ - lookupBndrRn name `thenRn` \ name' -> - rnHsType 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. + +\begin{code} +rnSrcDeprecDecls :: [RdrNameDeprecation] -> TcRn m Deprecations +rnSrcDeprecDecls [] + = returnM NoDeprecs - -- Get the pragma info (if any). - getModeRn `thenRn` \ (InterfaceMode _ print_unqual) -> - setModeRn (InterfaceMode Optional print_unqual) $ - -- In all the rest of the signature we read in optional mode, - -- so that (a) we don't die - mapRn rnIdInfo id_infos `thenRn` \ id_infos' -> - returnRn (SigD (IfaceSig name' ty' id_infos' loc)) +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. - -Renaming type variables is a pain. Because they now contain uniques, -it is necessary to pass in an association list which maps a parsed -tyvar to its Name representation. In some cases (type signatures of -values), it is even necessary to go over the type first in order to -get the set of tyvars used by it, make an assoc list, and then go over -it again to rename the tyvars! However, we can also do some scoping -checks at the same time. - \begin{code} -rnDecl (TyD (TyData new_or_data context tycon tyvars condecls derivings pragmas src_loc)) - = pushSrcLocRn src_loc $ - lookupBndrRn tycon `thenRn` \ tycon' -> - bindTyVarsRn data_doc tyvars $ \ tyvars' -> - rnContext context `thenRn` \ context' -> - checkDupOrQualNames data_doc con_names `thenRn_` - mapRn rnConDecl condecls `thenRn` \ condecls' -> - rnDerivs derivings `thenRn` \ derivings' -> - ASSERT(isNoDataPragmas pragmas) - returnRn (TyD (TyData new_or_data context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc)) +rnSrcTyClDecl tycl_decl + = rnTyClDecl tycl_decl `thenM` \ new_decl -> + finishSourceTyClDecl tycl_decl new_decl `thenM` \ (new_decl', fvs) -> + returnM (new_decl', fvs `plusFV` tyClDeclFVs new_decl') + +rnSrcInstDecl inst + = rnInstDecl inst `thenM` \ new_inst -> + finishSourceInstDecl inst new_inst `thenM` \ (new_inst', fvs) -> + returnM (new_inst', fvs `plusFV` instDeclFVs new_inst') + +rnDefaultDecl (DefaultDecl tys src_loc) + = addSrcLoc src_loc $ + mapFvRn (rnHsTypeFVs doc_str) tys `thenM` \ (tys', fvs) -> + returnM (DefaultDecl tys' src_loc, fvs) where - data_doc = text "the data type declaration for" <+> ppr tycon - con_names = map conDeclName condecls + doc_str = text "In a `default' declaration" -rnDecl (TyD (TySynonym name tyvars ty src_loc)) - = pushSrcLocRn src_loc $ - lookupBndrRn name `thenRn` \ name' -> - bindTyVarsRn syn_doc tyvars $ \ tyvars' -> - rnHsType ty `thenRn` \ ty' -> - returnRn (TyD (TySynonym name' tyvars' ty' src_loc)) + +rnCoreDecl (CoreDecl name ty rhs loc) + = addSrcLoc loc $ + lookupTopBndrRn name `thenM` \ name' -> + rnHsTypeFVs doc_str ty `thenM` \ (ty', ty_fvs) -> + rnCoreExpr rhs `thenM` \ rhs' -> + returnM (CoreDecl name' ty' rhs' loc, + ty_fvs `plusFV` ufExprFVs rhs') where - syn_doc = text "the declaration for type synonym" <+> ppr name + doc_str = text "In the Core declaration for" <+> quotes (ppr name) \end{code} %********************************************************* %* * -\subsection{Class declarations} + Bindings %* * %********************************************************* -@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. +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. \begin{code} -rnDecl (ClD (ClassDecl context cname tyvars sigs mbinds pragmas tname dname src_loc)) - = pushSrcLocRn src_loc $ +rnBinds :: RdrNameHsBinds -> RnM (RenamedHsBinds, DefUses) +-- This version assumes that the binders are already in scope +-- It's used only in 'mdo' +rnBinds EmptyBinds = returnM (EmptyBinds, emptyDUs) +rnBinds (MonoBind bind sigs _) = rnMonoBinds NotTopLevel bind sigs +rnBinds b@(IPBinds bind _) = addErr (badIpBinds b) `thenM_` + returnM (EmptyBinds, emptyDUs) + +rnBindsAndThen :: RdrNameHsBinds + -> (RenamedHsBinds -> RnM (result, FreeVars)) + -> RnM (result, FreeVars) +-- This version (a) assumes that the binding vars are not already in scope +-- (b) removes the binders from the free vars of the thing inside +-- The parser doesn't produce ThenBinds +rnBindsAndThen EmptyBinds thing_inside = thing_inside EmptyBinds +rnBindsAndThen (MonoBind bind sigs _) thing_inside = rnMonoBindsAndThen bind sigs thing_inside +rnBindsAndThen (IPBinds binds is_with) thing_inside + = warnIf is_with withWarning `thenM_` + rnIPBinds binds `thenM` \ (binds',fv_binds) -> + thing_inside (IPBinds binds' is_with) `thenM` \ (thing, fvs_thing) -> + returnM (thing, fvs_thing `plusFV` fv_binds) +\end{code} - lookupBndrRn cname `thenRn` \ cname' -> - lookupBndrRn tname `thenRn` \ tname' -> - lookupBndrRn dname `thenRn` \ dname' -> - bindTyVarsRn cls_doc tyvars ( \ tyvars' -> - rnContext context `thenRn` \ context' -> +%************************************************************************ +%* * +\subsubsection{@rnIPBinds@s: in implicit parameter bindings} * +%* * +%************************************************************************ - -- Check the signatures - let - clas_tyvar_names = map getTyVarName tyvars' - in - checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_` - mapRn (rn_op cname' clas_tyvar_names) sigs `thenRn` \ sigs' -> - returnRn (tyvars', context', sigs') - ) `thenRn` \ (tyvars', context', sigs') -> +\begin{code} +rnIPBinds [] = returnM ([], emptyFVs) +rnIPBinds ((n, expr) : binds) + = newIPName n `thenM` \ name -> + rnExpr expr `thenM` \ (expr',fvExpr) -> + rnIPBinds binds `thenM` \ (binds',fvBinds) -> + returnM ((name, expr') : binds', fvExpr `plusFV` fvBinds) - -- Check the methods - checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_` - rnMethodBinds mbinds `thenRn` \ mbinds' -> +\end{code} - -- Typechecker is responsible for checking that we only - -- give default-method bindings for things in this class. - -- The renamer *could* check this for class decls, but can't - -- for instance decls. - ASSERT(isNoClassPragmas pragmas) - returnRn (ClD (ClassDecl context' cname' tyvars' sigs' mbinds' NoClassPragmas tname' dname' src_loc)) +%********************************************************* +%* * +\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 -> - rnHsSigType (quotes (ppr op)) ty `thenRn` \ new_ty -> - - -- Make the default-method name - let - dm_occ = prefixOccName SLIT("$m") (rdrNameOcc op) - in - getModuleRn `thenRn` \ mod_name -> - getModeRn `thenRn` \ mode -> - (case (mode, maybe_dm) of - (SourceMode, _) | op `elem` meth_rdr_names - -> -- There's an explicit method decl - newLocallyDefinedGlobalName mod_name dm_occ - (\_ -> Exported) locn `thenRn` \ dm_name -> - returnRn (Just dm_name) - - (InterfaceMode _ _, Just _) - -> -- Imported class that has a default method decl - newImportedGlobalName mod_name dm_occ (ifaceFlavour clas) `thenRn` \ dm_name -> - addOccurrenceName dm_name `thenRn_` - returnRn (Just dm_name) - - other -> returnRn Nothing - ) `thenRn` \ maybe_dm_name -> - - -- Check that each class tyvar appears in op_ty - let - (ctxt, op_ty) = case new_ty of - HsForAllTy tvs ctxt op_ty -> (ctxt, op_ty) - other -> ([], new_ty) - ctxt_fvs = extractHsCtxtTyNames ctxt -- Includes tycons/classes but we - op_ty_fvs = extractHsTyNames op_ty -- don't care about that - - check_in_op_ty clas_tyvar = checkRn (clas_tyvar `elemNameSet` op_ty_fvs) - (classTyVarNotInOpTyErr clas_tyvar sig) - in - mapRn check_in_op_ty clas_tyvars `thenRn_` - - returnRn (ClassOpSig op_name maybe_dm_name new_ty locn) + extras (CImport _ _ _ _ CWrapper) + = mkFVs [ newStablePtrName + , bindIOName + , returnIOName + ] + extras (DNImport _) + = mkFVs [ bindIOName + , objectTyConName + , unmarshalObjectName + , marshalObjectName + , marshalStringName + , unmarshalStringName + , checkDotnetResName + ] + 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 [name', bindIOName, returnIOName] `plusFV` fvs ) + -- NB: a foreign export is an *occurrence site* for name, so + -- we add it to the free-variable list. It might, for example, + -- be imported from another module + +fo_decl_msg name = ptext SLIT("In the foreign declaration for") <+> ppr name \end{code} @@ -232,95 +357,325 @@ rnDecl (ClD (ClassDecl context cname tyvars sigs mbinds pragmas tname dname src_ %********************************************************* \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' -> - +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 + 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 -- Rename the bindings -- NB meth_names can be qualified! - checkDupNames meth_doc meth_names `thenRn_` - rnMethodBinds mbinds `thenRn` \ mbinds' -> + checkDupNames meth_doc meth_names `thenM_` + extendTyVarEnvForMethodBinds inst_tyvars ( + rnMethodBinds cls [] mbinds + ) `thenM` \ (mbinds', meth_fvs) -> let - binders = mkNameSet (map fst (bagToList (collectMonoBinders mbinds'))) - in - renameSigs NotTopLevel True binders uprags `thenRn` \ new_uprags -> - - let - -- We use the class name and the name of the first - -- type constructor the class is applied to. - (cl_nm, tycon_nm) = mkDictPrefix inst_ty' - - mkDictPrefix (MonoDictTy cl tys) = - case tys of - [] -> (c_nm, nilOccName ) - (ty:_) -> (c_nm, getInstHeadTy ty) - where - c_nm = nameOccName (getName cl) - - mkDictPrefix (HsPreForAllTy _ ty) = mkDictPrefix ty - mkDictPrefix (HsForAllTy _ _ ty) = mkDictPrefix ty -- can this - mkDictPrefix _ = (nilOccName, nilOccName) - - getInstHeadTy t - = case t of - MonoTyVar tv -> nameOccName (getName tv) - MonoTyApp t _ -> getInstHeadTy t - _ -> nilOccName - -- I cannot see how the rest of HsType constructors - -- can occur, but this isn't really a failure condition, - -- so we return silently. - - nilOccName = (VarOcc _NIL_) -- ToDo: add OccName constructor fun for this. + binders = collectMonoBinders mbinds' in - newDfunName cl_nm tycon_nm 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)) - 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 (renameSigs uprags) `thenM` \ uprags' -> + checkSigs (okInstDclSig (mkNameSet binders)) uprags' `thenM_` + + returnM (InstDecl inst_ty mbinds' uprags' maybe_dfun_name src_loc, + meth_fvs `plusFV` hsSigsFVs uprags') \end{code} %********************************************************* %* * -\subsection{Default declarations} +\subsection{Rules} %* * %********************************************************* \begin{code} -rnDecl (DefD (DefaultDecl tys src_loc)) - = pushSrcLocRn src_loc $ - mapRn rnHsType tys `thenRn` \ tys' -> - lookupImplicitOccRn numClass_RDR `thenRn_` - returnRn (DefD (DefaultDecl tys' src_loc)) +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 $ + bindPatSigTyVarsFV (collectRuleBndrSigTys vars) $ + + bindLocalsFV 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) -> + let + mb_bad = validRuleLhs ids lhs' + in + checkErr (isNothing mb_bad) + (badRuleLhsErr rule_name lhs' mb_bad) `thenM_` + let + bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)] + in + mappM (addErr . badRuleVar rule_name) bad_vars `thenM_` + returnM (HsRule rule_name act vars' lhs' rhs' src_loc, + fv_vars `plusFV` fv_lhs `plusFV` fv_rhs) + where + 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} + +Check the shape of a transformation rule LHS. Currently +we only allow LHSs of the form @(f e1 .. en)@, where @f@ is +not one of the @forall@'d variables. We also restrict the form of the LHS so +that it may be plausibly matched. Basically you only get to write ordinary +applications. (E.g. a case expression is not allowed: too elaborate.) + +NB: if you add new cases here, make sure you add new ones to TcRule.ruleLhsTvs + +\begin{code} +validRuleLhs :: [Name] -> RenamedHsExpr -> Maybe RenamedHsExpr +-- Nothing => OK +-- Just e => Not ok, and e is the offending expression +validRuleLhs foralls lhs + = check lhs + where + check (OpApp e1 op _ e2) = check op `seqMaybe` check_e e1 `seqMaybe` check_e e2 + check (HsApp e1 e2) = check e1 `seqMaybe` check_e e2 + check (HsVar v) | v `notElem` foralls = Nothing + check other = Just other -- Failure + + check_e (HsVar v) = Nothing + check_e (HsPar e) = check_e e + check_e (HsLit e) = Nothing + check_e (HsOverLit e) = Nothing + + check_e (OpApp e1 op _ e2) = check_e e1 `seqMaybe` check_e op `seqMaybe` check_e e2 + check_e (HsApp e1 e2) = check_e e1 `seqMaybe` check_e e2 + check_e (NegApp e _) = check_e e + check_e (ExplicitList _ es) = check_es es + check_e (ExplicitTuple es _) = check_es es + check_e other = Just other -- Fails + + check_es es = foldr (seqMaybe . check_e) Nothing es \end{code} + %********************************************************* %* * -\subsection{Foreign declarations} +\subsection{Type, class and iface sig declarations} %* * %********************************************************* +@rnTyDecl@ uses the `global name function' to create a new type +declaration in which local names have been replaced by their original +names, reporting any unknown names. + +Renaming type variables is a pain. Because they now contain uniques, +it is necessary to pass in an association list which maps a parsed +tyvar to its @Name@ representation. +In some cases (type signatures of values), +it is even necessary to go over the type first +in order to get the set of tyvars used by it, make an assoc list, +and then go over it again to rename the tyvars! +However, we can also do some scoping checks at the same time. + \begin{code} -rnDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc)) - = pushSrcLocRn src_loc $ - lookupBndrRn name `thenRn` \ name' -> - (if is_export then - addImplicitOccRn name' - else - returnRn name') `thenRn_` - rnHsSigType fo_decl_msg ty `thenRn` \ ty' -> - returnRn (ForD (ForeignDecl name' imp_exp ty' ext_nm cconv src_loc)) - where - fo_decl_msg = ptext SLIT("a foreign declaration") - is_export = not (maybeToBool imp_exp) && not (isDynamic ext_nm) +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 $ + + lookupTopBndrRn cname `thenM` \ cname' -> + + -- 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' -> + renameSigs non_op_sigs `thenM` \ non_ops' -> + checkSigs okClsDclSig non_ops' `thenM_` + -- Typechecker is responsible for checking that we only + -- give default-method bindings for things in this class. + -- The renamer *could* check this for class decls, but can't + -- for instance decls. + + returnM (ClassDecl { tcdCtxt = context', tcdName = cname', tcdTyVars = tyvars', + tcdFDs = fds', tcdSigs = non_ops' ++ sigs', tcdMeths = Nothing, + tcdLoc = src_loc}) + where + cls_doc = text "In the declaration for class" <+> ppr cname + sig_doc = text "In the signatures for class" <+> ppr cname + +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} +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} @@ -328,77 +683,63 @@ rnDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc)) %********************************************************* \begin{code} -rnDerivs :: Maybe [RdrName] -> RnMS s (Maybe [Name]) +conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc) +conDeclName (ConDecl n _ _ _ l) = (n,l) + +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) + = 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 "In the definition of data constructor" <+> quotes (ppr name) -rnDerivs Nothing -- derivs not specified - = lookupImplicitOccRn evalClass_RDR `thenRn_` - returnRn Nothing +rnConDetails doc locn (PrefixCon tys) + = mappM (rnBangTy doc) tys `thenM` \ new_tys -> + returnM (PrefixCon new_tys) -rnDerivs (Just ds) - = lookupImplicitOccRn evalClass_RDR `thenRn_` - mapRn rn_deriv ds `thenRn` \ derivs -> - returnRn (Just derivs) - where - rn_deriv clas - = lookupOccRn clas `thenRn` \ clas_name -> - - -- Now add extra "occurrences" for things that - -- the deriving mechanism will later need in order to - -- generate code for this class. - case lookupUFM derivingOccurrences clas_name of - Nothing -> addErrRn (derivingNonStdClassErr clas_name) `thenRn_` - returnRn clas_name - - Just occs -> mapRn lookupImplicitOccRn occs `thenRn_` - returnRn clas_name -\end{code} +rnConDetails doc locn (InfixCon ty1 ty2) + = rnBangTy doc ty1 `thenM` \ new_ty1 -> + rnBangTy doc ty2 `thenM` \ new_ty2 -> + returnM (InfixCon new_ty1 new_ty2) -\begin{code} -conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc) -conDeclName (ConDecl n _ _ l) = (n,l) - -rnConDecl :: RdrNameConDecl -> RnMS s RenamedConDecl -rnConDecl (ConDecl name cxt details locn) - = pushSrcLocRn locn $ - checkConName name `thenRn_` - lookupBndrRn name `thenRn` \ new_name -> - rnConDetails name locn details `thenRn` \ new_details -> - rnContext cxt `thenRn` \ new_context -> - returnRn (ConDecl new_name new_context new_details locn) - -rnConDetails con locn (VanillaCon tys) - = mapRn rnBangTy tys `thenRn` \ new_tys -> - returnRn (VanillaCon new_tys) - -rnConDetails con locn (InfixCon ty1 ty2) - = rnBangTy ty1 `thenRn` \ new_ty1 -> - rnBangTy ty2 `thenRn` \ new_ty2 -> - returnRn (InfixCon new_ty1 new_ty2) - -rnConDetails con locn (NewCon ty) - = rnHsType ty `thenRn` \ new_ty -> - returnRn (NewCon new_ty) - -rnConDetails con locn (RecCon fields) - = checkDupOrQualNames fld_doc field_names `thenRn_` - mapRn rnField fields `thenRn` \ new_fields -> - returnRn (RecCon new_fields) +rnConDetails doc locn (RecCon fields) + = checkDupOrQualNames doc field_names `thenM_` + mappM (rnField doc) fields `thenM` \ new_fields -> + returnM (RecCon new_fields) where - fld_doc = text "the fields of constructor" <> ppr con - field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds] - -rnField (names, ty) - = mapRn lookupBndrRn names `thenRn` \ new_names -> - rnBangTy ty `thenRn` \ new_ty -> - returnRn (new_names, new_ty) + field_names = [(fld, locn) | (fld, _) <- fields] -rnBangTy (Banged ty) - = rnHsType ty `thenRn` \ new_ty -> - returnRn (Banged new_ty) +rnField doc (name, ty) + = lookupTopBndrRn name `thenM` \ new_name -> + rnBangTy doc ty `thenM` \ new_ty -> + returnM (new_name, new_ty) -rnBangTy (Unbanged ty) - = rnHsType ty `thenRn` \ new_ty -> - returnRn (Unbanged new_ty) +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 @@ -411,8 +752,7 @@ rnBangTy (Unbanged ty) -- from interface files, which always print in prefix form checkConName name - = checkRn (isLexCon (occNameString (rdrNameOcc name))) - (badDataCon name) + = checkErr (isRdrDataCon name) (badDataCon name) \end{code} @@ -423,344 +763,239 @@ checkConName name %********************************************************* \begin{code} -rnHsSigType :: SDoc -> RdrNameHsType -> RnMS s RenamedHsType - -- rnHsSigType is used for source-language type signatures, - -- which use *implicit* universal quantification. - --- Given the signature C => T we universally quantify over FV(T) \ {in-scope-tyvars} --- --- We insist that the universally quantified type vars is a superset of FV(C) --- It follows that FV(T) is a superset of FV(C), so that the context constrains --- no type variables that don't appear free in the tau-type part. - -rnHsSigType doc_str full_ty@(HsPreForAllTy ctxt ty) -- From source code (no kinds on tyvars) - = getLocalNameEnv `thenRn` \ name_env -> - let - mentioned_tyvars = extractHsTyVars ty - forall_tyvars = filter (not . in_scope) mentioned_tyvars - in_scope tv = maybeToBool (lookupFM name_env tv) +rnFds :: SDoc -> [FunDep RdrName] -> RnM [FunDep Name] - constrained_tyvars = extractHsCtxtTyVars ctxt - constrained_and_in_scope = filter in_scope constrained_tyvars - constrained_and_not_mentioned = filter (not . (`elem` mentioned_tyvars)) constrained_tyvars - - -- Zap the context if there's a problem, to avoid duplicate error message. - ctxt' | null constrained_and_in_scope && null constrained_and_not_mentioned = ctxt - | otherwise = [] - in - checkRn (null constrained_and_in_scope) - (ctxtErr1 sig_doc constrained_and_in_scope) `thenRn_` - checkRn (null constrained_and_not_mentioned) - (ctxtErr2 sig_doc constrained_and_not_mentioned ty) `thenRn_` - - (bindTyVarsRn sig_doc (map UserTyVar forall_tyvars) $ \ new_tyvars -> - rnContext ctxt' `thenRn` \ new_ctxt -> - rnHsType ty `thenRn` \ new_ty -> - returnRn (HsForAllTy new_tyvars new_ctxt new_ty) - ) +rnFds doc fds + = mappM rn_fds fds where - sig_doc = text "the type signature for" <+> doc_str - - -rnHsSigType doc_str other_ty = rnHsType other_ty - -rnHsType :: RdrNameHsType -> RnMS s RenamedHsType -rnHsType (HsForAllTy tvs ctxt ty) -- From an interface file (tyvars may be kinded) - = rn_poly_help tvs ctxt ty - -rnHsType full_ty@(HsPreForAllTy ctxt ty) -- A (context => ty) embedded in a type. - -- Universally quantify over tyvars in context - = getLocalNameEnv `thenRn` \ name_env -> - let - forall_tyvars = extractHsCtxtTyVars ctxt - in - rn_poly_help (map UserTyVar forall_tyvars) ctxt ty - -rnHsType (MonoTyVar tyvar) - = lookupOccRn tyvar `thenRn` \ tyvar' -> - returnRn (MonoTyVar tyvar') - -rnHsType (MonoFunTy ty1 ty2) - = andRn MonoFunTy (rnHsType ty1) (rnHsType ty2) - -rnHsType (MonoListTy _ ty) - = lookupImplicitOccRn listType_RDR `thenRn` \ tycon_name -> - rnHsType ty `thenRn` \ ty' -> - returnRn (MonoListTy tycon_name ty') - -rnHsType (MonoTupleTy _ tys) - = lookupImplicitOccRn (tupleType_RDR (length tys)) `thenRn` \ tycon_name -> - mapRn rnHsType tys `thenRn` \ tys' -> - returnRn (MonoTupleTy tycon_name tys') - -rnHsType (MonoTyApp ty1 ty2) - = rnHsType ty1 `thenRn` \ ty1' -> - rnHsType ty2 `thenRn` \ ty2' -> - returnRn (MonoTyApp ty1' ty2') - -rnHsType (MonoDictTy clas tys) - = lookupOccRn clas `thenRn` \ clas' -> - mapRn rnHsType tys `thenRn` \ tys' -> - returnRn (MonoDictTy clas' tys') - -rn_poly_help :: [HsTyVar RdrName] -- Universally quantified tyvars - -> RdrNameContext - -> RdrNameHsType - -> RnMS s RenamedHsType -rn_poly_help tyvars ctxt ty - = bindTyVarsRn sig_doc tyvars $ \ new_tyvars -> - rnContext ctxt `thenRn` \ new_ctxt -> - rnHsType ty `thenRn` \ new_ty -> - returnRn (HsForAllTy new_tyvars new_ctxt new_ty) - where - sig_doc = text "a nested for-all type" -\end{code} - - -\begin{code} -rnContext :: RdrNameContext -> RnMS s RenamedContext - -rnContext ctxt - = mapRn rn_ctxt ctxt `thenRn` \ result -> - let - (_, dup_asserts) = removeDups cmp_assert result - (alls, theta) = partition (\(c,_) -> c == allClass_NAME) result - in - - -- Check for duplicate assertions - -- If this isn't an error, then it ought to be: - mapRn (addWarnRn . dupClassAssertWarn theta) dup_asserts `thenRn_` + rn_fds (tys1, tys2) + = rnHsTyVars doc tys1 `thenM` \ tys1' -> + rnHsTyVars doc tys2 `thenM` \ tys2' -> + returnM (tys1', tys2') - -- Check for All constraining a non-type-variable - mapRn check_All alls `thenRn_` - - -- Done. Return a theta omitting all the "All" constraints. - -- They have done done their work by ensuring that we universally - -- quantify over their tyvar. - returnRn theta - where - rn_ctxt (clas, tys) - = -- Mini hack here. If the class is our pseudo-class "All", - -- then we don't want to record it as an occurrence, otherwise - -- we try to slurp it in later and it doesn't really exist at all. - -- Easiest thing is simply not to put it in the occurrence set. - lookupBndrRn clas `thenRn` \ clas_name -> - (if clas_name /= allClass_NAME then - addOccurrenceName clas_name - else - returnRn clas_name - ) `thenRn_` - mapRn rnHsType tys `thenRn` \ tys' -> - returnRn (clas_name, tys') - - - cmp_assert (c1,tys1) (c2,tys2) - = (c1 `compare` c2) `thenCmp` (cmpHsTypes compare tys1 tys2) - - check_All (c, [MonoTyVar _]) = returnRn () -- OK! - check_All assertion = addErrRn (wierdAllErr assertion) +rnHsTyVars doc tvs = mappM (rnHsTyvar doc) tvs +rnHsTyvar doc tyvar = lookupOccRn tyvar \end{code} - %********************************************************* -%* * +%* * \subsection{IdInfo} -%* * +%* * %********************************************************* \begin{code} -rnIdInfo (HsStrictness strict) - = rnStrict strict `thenRn` \ strict' -> - returnRn (HsStrictness strict') - -rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ expr' -> - returnRn (HsUnfold inline expr') -rnIdInfo (HsArity arity) = returnRn (HsArity arity) -rnIdInfo (HsUpdate update) = returnRn (HsUpdate update) -rnIdInfo (HsFBType fb) = returnRn (HsFBType fb) -rnIdInfo (HsArgUsage au) = returnRn (HsArgUsage au) -rnIdInfo (HsSpecialise tyvars tys expr) - = bindTyVarsRn doc tyvars $ \ tyvars' -> - rnCoreExpr expr `thenRn` \ expr' -> - mapRn rnHsType tys `thenRn` \ tys' -> - returnRn (HsSpecialise tyvars' tys' expr') - where - doc = text "Specialise in interface pragma" - - -rnStrict (HsStrictnessInfo demands (Just (worker,cons))) - -- The sole purpose of the "cons" field is so that we can mark the constructors - -- needed to build the wrapper as "needed", so that their data type decl will be - -- slurped in. After that their usefulness is o'er, so we just put in the empty list. - = lookupOccRn worker `thenRn` \ worker' -> - mapRn lookupOccRn cons `thenRn_` - returnRn (HsStrictnessInfo demands (Just (worker',[]))) - --- Boring, but necessary for the type checker. -rnStrict (HsStrictnessInfo demands Nothing) = returnRn (HsStrictnessInfo demands Nothing) -rnStrict HsBottom = returnRn HsBottom +rnIdInfo (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) + = 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 (UfLit lit) = returnRn (UfLit lit) +rnCoreExpr (UfLitLit l ty) + = rnHsType (text "litlit") ty `thenM` \ ty' -> + returnM (UfLitLit l ty') -rnCoreExpr (UfCon con args) - = lookupOccRn con `thenRn` \ con' -> - mapRn rnCoreArg args `thenRn` \ args' -> - returnRn (UfCon con' args') +rnCoreExpr (UfFCall cc ty) + = rnHsType (text "ccall") ty `thenM` \ ty' -> + returnM (UfFCall cc ty') -rnCoreExpr (UfPrim prim args) - = rnCorePrim prim `thenRn` \ prim' -> - mapRn rnCoreArg args `thenRn` \ args' -> - returnRn (UfPrim prim' args') +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' -> - rnCoreArg arg `thenRn` \ arg' -> - returnRn (UfApp fun' arg') + = rnCoreExpr fun `thenM` \ fun' -> + rnCoreExpr arg `thenM` \ arg' -> + returnM (UfApp fun' arg') -rnCoreExpr (UfCase scrut alts) - = rnCoreExpr scrut `thenRn` \ scrut' -> - rnCoreAlts alts `thenRn` \ alts' -> - returnRn (UfCase scrut' 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 - = rnHsType ty `thenRn` \ ty' -> - bindLocalsRn "unfolding value" [name] $ \ [name'] -> + = rnHsType doc ty `thenM` \ ty' -> + bindCoreLocalRn name $ \ name' -> thing_inside (UfValBinder name' ty') + where + doc = text "unfolding id" rnCoreBndr (UfTyBinder name kind) thing_inside - = bindLocalsRn "unfolding tyvar" [name] $ \ [name'] -> + = bindCoreLocalRn name $ \ name' -> thing_inside (UfTyBinder name' kind) -rnCoreBndrs bndrs thing_inside -- Expect them all to be ValBinders - = mapRn rnHsType tys `thenRn` \ tys' -> - bindLocalsRn "unfolding value" names $ \ names' -> - thing_inside (zipWith UfValBinder names' tys') - where - names = map (\ (UfValBinder name _) -> name) bndrs - tys = map (\ (UfValBinder _ ty) -> ty) bndrs - -rnCoreBndrNamess names thing_inside - = bindLocalsRn "unfolding value" names $ \ names' -> - thing_inside names' +rnCoreBndrs [] thing_inside = thing_inside [] +rnCoreBndrs (b:bs) thing_inside = rnCoreBndr b $ \ name' -> + rnCoreBndrs bs $ \ names' -> + thing_inside (name':names') \end{code} \begin{code} -rnCoreArg (UfVarArg v) = lookupOccRn v `thenRn` \ v' -> returnRn (UfVarArg v') -rnCoreArg (UfTyArg ty) = rnHsType ty `thenRn` \ ty' -> returnRn (UfTyArg ty') -rnCoreArg (UfLitArg lit) = returnRn (UfLitArg lit) - -rnCoreAlts (UfAlgAlts alts deflt) - = mapRn rn_alt alts `thenRn` \ alts' -> - rnCoreDefault deflt `thenRn` \ deflt' -> - returnRn (UfAlgAlts alts' deflt') - where - rn_alt (con, bndrs, rhs) = lookupOccRn con `thenRn` \ con' -> - bindLocalsRn "unfolding alt" bndrs $ \ bndrs' -> - rnCoreExpr rhs `thenRn` \ rhs' -> - returnRn (con', bndrs', rhs') - -rnCoreAlts (UfPrimAlts alts deflt) - = mapRn rn_alt alts `thenRn` \ alts' -> - rnCoreDefault deflt `thenRn` \ deflt' -> - returnRn (UfPrimAlts alts' deflt') - where - rn_alt (lit, rhs) = rnCoreExpr rhs `thenRn` \ rhs' -> - returnRn (lit, rhs') - -rnCoreDefault UfNoDefault = returnRn UfNoDefault -rnCoreDefault (UfBindDefault bndr rhs) = bindLocalsRn "unfolding default" [bndr] $ \ [bndr'] -> - rnCoreExpr rhs `thenRn` \ rhs' -> - returnRn (UfBindDefault bndr' rhs') +rnCoreAlt (con, bndrs, rhs) + = rnUfCon con `thenM` \ con' -> + bindCoreLocalsRn bndrs $ \ bndrs' -> + rnCoreExpr rhs `thenM` \ rhs' -> + returnM (con', bndrs', rhs') rnNote (UfCoerce ty) - = rnHsType ty `thenRn` \ ty' -> - returnRn (UfCoerce ty') + = rnHsType (text "unfolding coerce") ty `thenM` \ ty' -> + returnM (UfCoerce ty') + +rnNote (UfSCC cc) = returnM (UfSCC cc) +rnNote UfInlineCall = returnM UfInlineCall +rnNote UfInlineMe = returnM UfInlineMe +rnNote (UfCoreNote s) = returnM (UfCoreNote s) + +rnUfCon UfDefault + = returnM UfDefault -rnNote (UfSCC cc) = returnRn (UfSCC cc) -rnNote UfInlineCall = returnRn UfInlineCall +rnUfCon (UfTupleAlt tup_con) + = returnM (UfTupleAlt tup_con) -rnCorePrim (UfOtherOp op) - = lookupOccRn op `thenRn` \ op' -> - returnRn (UfOtherOp op') +rnUfCon (UfDataAlt con) + = lookupOccRn con `thenM` \ con' -> + returnM (UfDataAlt con') -rnCorePrim (UfCCallOp str casm gc arg_tys res_ty) - = mapRn rnHsType arg_tys `thenRn` \ arg_tys' -> - rnHsType res_ty `thenRn` \ res_ty' -> - returnRn (UfCCallOp str casm gc arg_tys' res_ty') +rnUfCon (UfLitAlt lit) + = returnM (UfLitAlt lit) + +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)] +%********************************************************* +%* * +\subsection{Errors} +%* * +%********************************************************* +\begin{code} badDataCon name = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)] -wierdAllErr assertion - = ptext SLIT("Mal-formed use of `All':") <+> pprClassAssertion assertion - -ctxtErr1 doc tyvars - = hsep [ptext SLIT("Context constrains in-scope type variable(s)"), - pprQuotedList tyvars] - $$ - nest 4 (ptext SLIT("in") <+> doc) - -ctxtErr2 doc tyvars ty - = (ptext SLIT("Context constrains type variable(s)") - <+> pprQuotedList tyvars) +badRuleLhsErr name lhs (Just bad_e) + = sep [ptext SLIT("Rule") <+> ftext name <> colon, + nest 4 (vcat [ptext SLIT("Illegal expression:") <+> ppr bad_e, + ptext SLIT("in left-hand side:") <+> ppr lhs])] $$ - nest 4 (vcat [ptext SLIT("that do not appear in") <+> quotes (ppr ty), - 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)"))] + +withWarning + = sep [quotes (ptext SLIT("with")), + ptext SLIT("is deprecated, use"), + quotes (ptext SLIT("let")), + ptext SLIT("instead")] + +badIpBinds binds + = hang (ptext SLIT("Implicit-parameter bindings illegal in 'mdo':")) 4 + (ppr binds) \end{code} +