X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnSource.lhs;h=a36812236d03256f3b37c6d0af5743f7eedeb967;hb=f3a5e6da3f50e6afdde52988bfabe6ea7b581ac1;hp=71fe8ffc44f8382bc6687208f4ae95086b57dbd8;hpb=cbdeae8fc8a1c72d20d89241acae8a313214b51c;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnSource.lhs b/ghc/compiler/rename/RnSource.lhs index 71fe8ff..a368122 100644 --- a/ghc/compiler/rename/RnSource.lhs +++ b/ghc/compiler/rename/RnSource.lhs @@ -4,52 +4,61 @@ \section[RnSource]{Main pass of renamer} \begin{code} -module RnSource ( rnTyClDecl, rnIfaceRuleDecl, rnInstDecl, rnSourceDecls, - rnHsType, rnHsSigType, rnHsTypeFVs, rnHsSigTypeFVs - ) where +module RnSource ( + rnSrcDecls, rnExtCoreDecls, checkModDeprec, + rnTyClDecl, rnIfaceRuleDecl, rnInstDecl, + rnBinds, rnStats, + ) where #include "HsVersions.h" import RnExpr import HsSyn -import HscTypes ( GlobalRdrEnv ) -import HsTypes ( hsTyVarNames, pprHsContext ) import RdrName ( RdrName, isRdrDataCon, elemRdrEnv ) -import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl, RdrNameTyClDecl, - extractRuleBndrsTyVars, extractHsTyRdrTyVars, - extractHsCtxtRdrTyVars, extractGenericPatTyVars +import RdrHsSyn ( RdrNameConDecl, RdrNameTyClDecl, RdrNameHsDecl, + RdrNameDeprecation, RdrNameFixitySig, + RdrNameHsBinds, + extractGenericPatTyVars ) import RnHsSyn import HsCore -import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, renameSigsFVs ) -import RnEnv ( lookupTopBndrRn, lookupOccRn, newIPName, lookupIfaceName, - lookupOrigNames, lookupSysBinder, newLocalsRn, - bindLocalsFVRn, - bindTyVarsRn, bindTyVars2Rn, - bindTyVarsFV2Rn, extendTyVarEnvFVRn, +import RnNames ( importsFromLocalDecls ) +import RnTypes ( rnHsType, rnHsSigType, rnHsTypeFVs, rnContext ) + +import RnBinds ( rnTopMonoBinds, rnMonoBinds, rnMethodBinds, + renameSigs, renameSigsFVs ) +import RnEnv ( lookupTopBndrRn, lookupOccRn, lookupSysBndr, + newLocalsRn, lookupGlobalOccRn, + bindLocalsFVRn, bindPatSigTyVars, + bindTyVarsRn, extendTyVarEnvFVRn, bindCoreLocalRn, bindCoreLocalsRn, bindLocalNames, - checkDupOrQualNames, checkDupNames, mapFvRn + checkDupOrQualNames, checkDupNames, mapFvRn, + lookupTopSrcBndr_maybe, lookupTopSrcBndr, + dataTcOccs, unknownNameErr, + plusGlobalRdrEnv ) -import RnMonad +import TcRnMonad +import BasicTypes ( FixitySig(..) ) +import HscTypes ( ExternalPackageState(..), FixityEnv, + Deprecations(..), plusDeprecs ) +import Module ( moduleEnvElts ) import Class ( FunDep, DefMeth (..) ) -import DataCon ( dataConId ) -import Name ( Name, NamedThing(..) ) +import TyCon ( DataConDetails(..), visibleDataCons ) +import Name ( Name ) import NameSet -import PrelInfo ( derivableClassKeys, cCallishClassKeys ) -import PrelNames ( deRefStablePtr_RDR, newStablePtr_RDR, - bindIO_RDR, returnIO_RDR - ) -import TysWiredIn ( tupleCon ) -import List ( partition, nub ) +import NameEnv +import ErrUtils ( dumpIfSet ) +import PrelNames ( newStablePtrName, bindIOName, returnIOName ) +import List ( partition ) +import Bag ( bagToList ) import Outputable import SrcLoc ( SrcLoc ) import CmdLineOpts ( DynFlag(..) ) -- Warn of unused for-all'd tyvars -import Unique ( Uniquable(..) ) -import Maybes ( maybeToBool ) -import ListSetOps ( removeDupsEq ) +import Maybes ( maybeToBool, seqMaybe ) +import Maybe ( maybe, catMaybes, isNothing ) \end{code} @rnSourceDecl@ `renames' declarations. @@ -68,6 +77,133 @@ Checks the @(..)@ etc constraints in the export list. \end{enumerate} +\begin{code} +rnSrcDecls :: [RdrNameHsDecl] -> RnM (TcGblEnv, [RenamedHsDecl], FreeVars) + +rnSrcDecls decls + = do { (rdr_env, imports) <- importsFromLocalDecls decls ; + updGblEnv (\gbl -> gbl { tcg_rdr_env = rdr_env `plusGlobalRdrEnv` + tcg_rdr_env gbl, + tcg_imports = imports `plusImportAvails` + tcg_imports gbl }) + $ do { + + -- Deal with deprecations (returns only the extra deprecations) + deprecs <- rnSrcDeprecDecls [d | DeprecD d <- decls] ; + updGblEnv (\gbl -> gbl { tcg_deprecs = tcg_deprecs gbl `plusDeprecs` deprecs }) + $ do { + + -- Deal with top-level fixity decls + -- (returns the total new fixity env) + fix_env <- rnSrcFixityDecls decls ; + updGblEnv (\gbl -> gbl { tcg_fix_env = fix_env }) + $ do { + + -- Rename remaining declarations + (rn_src_decls, src_fvs) <- rn_src_decls decls ; + + tcg_env <- getGblEnv ; + return (tcg_env, rn_src_decls, src_fvs) + }}}} + +rnExtCoreDecls :: [RdrNameHsDecl] -> RnM ([RenamedHsDecl], FreeVars) +rnExtCoreDecls decls = rn_src_decls decls + +rn_src_decls decls -- Declarartions get reversed, but no matter + = go emptyFVs [] decls + where + -- Fixity and deprecations have been dealt with already; ignore them + go fvs ds' [] = returnM (ds', fvs) + go fvs ds' (FixD _:ds) = go fvs ds' ds + go fvs ds' (DeprecD _:ds) = go fvs ds' ds + go fvs ds' (d:ds) = rnSrcDecl d `thenM` \(d', fvs') -> + go (fvs `plusFV` fvs') (d':ds') ds +\end{code} + + +%********************************************************* +%* * + Source-code fixity declarations +%* * +%********************************************************* + +\begin{code} +rnSrcFixityDecls :: [RdrNameHsDecl] -> TcRn m FixityEnv +rnSrcFixityDecls decls + = getGblEnv `thenM` \ gbl_env -> + foldlM rnFixityDecl (tcg_fix_env gbl_env) + fix_decls `thenM` \ fix_env -> + traceRn (text "fixity env" <+> ppr fix_env) `thenM_` + returnM fix_env + where + fix_decls = foldr get_fix_sigs [] decls + + -- Get fixities from top level decls, and from class decl sigs too + get_fix_sigs (FixD fix) acc = fix:acc + get_fix_sigs (TyClD (ClassDecl { tcdSigs = sigs})) acc + = [sig | FixSig sig <- sigs] ++ acc + get_fix_sigs other_decl acc = acc + +rnFixityDecl :: FixityEnv -> RdrNameFixitySig -> TcRn m FixityEnv +rnFixityDecl fix_env (FixitySig rdr_name fixity loc) + = -- GHC extension: look up both the tycon and data con + -- for con-like things + -- If neither are in scope, report an error; otherwise + -- add both to the fixity env + mappM lookupTopSrcBndr_maybe (dataTcOccs rdr_name) `thenM` \ maybe_ns -> + case catMaybes maybe_ns of + [] -> addSrcLoc loc $ + addErr (unknownNameErr rdr_name) `thenM_` + returnM fix_env + ns -> foldlM add fix_env ns + where + add fix_env name + = case lookupNameEnv fix_env name of + Just (FixitySig _ _ loc') -> addErr (dupFixityDecl rdr_name loc loc') `thenM_` + returnM fix_env + Nothing -> returnM (extendNameEnv fix_env name (FixitySig name fixity loc)) + +dupFixityDecl rdr_name loc1 loc2 + = vcat [ptext SLIT("Multiple fixity declarations for") <+> quotes (ppr rdr_name), + ptext SLIT("at ") <+> ppr loc1, + ptext SLIT("and") <+> ppr loc2] +\end{code} + + +%********************************************************* +%* * + Source-code deprecations declarations +%* * +%********************************************************* + +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 + +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{Source code declarations} @@ -75,51 +211,70 @@ Checks the @(..)@ etc constraints in the export list. %********************************************************* \begin{code} -rnSourceDecls :: GlobalRdrEnv -> LocalFixityEnv - -> [RdrNameHsDecl] - -> RnMG ([RenamedHsDecl], FreeVars) - -- The decls get reversed, but that's ok - -rnSourceDecls gbl_env local_fixity_env decls - = initRnMS gbl_env emptyRdrEnv local_fixity_env SourceMode (go emptyFVs [] decls) - where - -- Fixity and deprecations have been dealt with already; ignore them - go fvs ds' [] = returnRn (ds', fvs) - go fvs ds' (FixD _:ds) = go fvs ds' ds - go fvs ds' (DeprecD _:ds) = go fvs ds' ds - go fvs ds' (d:ds) = rnSourceDecl d `thenRn` \(d', fvs') -> - go (fvs `plusFV` fvs') (d':ds') ds +rnSrcDecl :: RdrNameHsDecl -> RnM (RenamedHsDecl, FreeVars) +rnSrcDecl (ValD binds) = rnTopBinds binds `thenM` \ (new_binds, fvs) -> + returnM (ValD new_binds, fvs) -rnSourceDecl :: RdrNameHsDecl -> RnMS (RenamedHsDecl, FreeVars) +rnSrcDecl (TyClD tycl_decl) + = rnTyClDecl tycl_decl `thenM` \ new_decl -> + finishSourceTyClDecl tycl_decl new_decl `thenM` \ (new_decl', fvs) -> + returnM (TyClD new_decl', fvs `plusFV` tyClDeclFVs new_decl') -rnSourceDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) -> - returnRn (ValD new_binds, fvs) +rnSrcDecl (InstD inst) + = rnInstDecl inst `thenM` \ new_inst -> + finishSourceInstDecl inst new_inst `thenM` \ (new_inst', fvs) -> + returnM (InstD new_inst', fvs `plusFV` instDeclFVs new_inst') -rnSourceDecl (TyClD tycl_decl) - = rnTyClDecl tycl_decl `thenRn` \ new_decl -> - finishSourceTyClDecl tycl_decl new_decl `thenRn` \ (new_decl', fvs) -> - returnRn (TyClD new_decl', fvs `plusFV` tyClDeclFVs new_decl') +rnSrcDecl (RuleD rule) + = rnHsRuleDecl rule `thenM` \ (new_rule, fvs) -> + returnM (RuleD new_rule, fvs) -rnSourceDecl (InstD inst) - = rnInstDecl inst `thenRn` \ new_inst -> - finishSourceInstDecl inst new_inst `thenRn` \ (new_inst', fvs) -> - returnRn (InstD new_inst', fvs `plusFV` instDeclFVs new_inst') +rnSrcDecl (ForD ford) + = rnHsForeignDecl ford `thenM` \ (new_ford, fvs) -> + returnM (ForD new_ford, fvs) -rnSourceDecl (RuleD rule) - = rnHsRuleDecl rule `thenRn` \ (new_rule, fvs) -> - returnRn (RuleD new_rule, fvs) +rnSrcDecl (DefD (DefaultDecl tys src_loc)) + = addSrcLoc src_loc $ + mapFvRn (rnHsTypeFVs doc_str) tys `thenM` \ (tys', fvs) -> + returnM (DefD (DefaultDecl tys' src_loc), fvs) + where + doc_str = text "In a `default' declaration" -rnSourceDecl (ForD ford) - = rnHsForeignDecl ford `thenRn` \ (new_ford, fvs) -> - returnRn (ForD new_ford, fvs) -rnSourceDecl (DefD (DefaultDecl tys src_loc)) - = pushSrcLocRn src_loc $ - mapFvRn (rnHsTypeFVs doc_str) tys `thenRn` \ (tys', fvs) -> - returnRn (DefD (DefaultDecl tys' src_loc), fvs) +rnSrcDecl (CoreD (CoreDecl name ty rhs loc)) + = addSrcLoc loc $ + lookupTopBndrRn name `thenM` \ name' -> + rnHsTypeFVs doc_str ty `thenM` \ (ty', ty_fvs) -> + rnCoreExpr rhs `thenM` \ rhs' -> + returnM (CoreD (CoreDecl name' ty' rhs' loc), + ty_fvs `plusFV` ufExprFVs rhs') where - doc_str = text "a `default' declaration" + doc_str = text "In the Core declaration for" <+> quotes (ppr name) +\end{code} + +%********************************************************* +%* * + Bindings +%* * +%********************************************************* + +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} +rnTopBinds :: RdrNameHsBinds -> RnM (RenamedHsBinds, FreeVars) +rnTopBinds EmptyBinds = returnM (EmptyBinds, emptyFVs) +rnTopBinds (MonoBind bind sigs _) = rnTopMonoBinds bind sigs + -- The parser doesn't produce other forms + +rnBinds :: RdrNameHsBinds + -> (RenamedHsBinds -> RnM (result, FreeVars)) + -> RnM (result, FreeVars) +rnBinds EmptyBinds thing_inside = thing_inside EmptyBinds +rnBinds (MonoBind bind sigs _) thing_inside = rnMonoBinds bind sigs thing_inside + -- the parser doesn't produce other forms \end{code} @@ -130,24 +285,28 @@ rnSourceDecl (DefD (DefaultDecl tys src_loc)) %********************************************************* \begin{code} -rnHsForeignDecl (ForeignImport name ty spec src_loc) - = pushSrcLocRn src_loc $ - lookupOccRn name `thenRn` \ name' -> - rnHsTypeFVs (fo_decl_msg name) ty `thenRn` \ (ty', fvs1) -> - lookupOrigNames (extras spec) `thenRn` \ fvs2 -> - returnRn (ForeignImport name' ty' spec src_loc, fvs1 `plusFV` fvs2) +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 - extras (CDynImport _) = [newStablePtr_RDR, deRefStablePtr_RDR, bindIO_RDR, returnIO_RDR] - extras other = [] - -rnHsForeignDecl (ForeignExport name ty spec src_loc) - = pushSrcLocRn src_loc $ - lookupOccRn name `thenRn` \ name' -> - rnHsTypeFVs (fo_decl_msg name) ty `thenRn` \ (ty', fvs1) -> - lookupOrigNames [bindIO_RDR, returnIO_RDR] `thenRn` \ fvs2 -> - returnRn (ForeignExport name' ty' spec src_loc, fvs1 `plusFV` fvs2) - -fo_decl_msg name = ptext SLIT("The foreign declaration for") <+> ppr name + extras (CImport _ _ _ _ CWrapper) = mkFVs [newStablePtrName, + bindIOName, returnIOName] + extras _ = emptyFVs + +rnHsForeignDecl (ForeignExport name ty spec isDeprec src_loc) + = addSrcLoc src_loc $ + lookupOccRn name `thenM` \ name' -> + rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) -> + returnM (ForeignExport name' ty' spec isDeprec src_loc, + mkFVs [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} @@ -160,17 +319,17 @@ fo_decl_msg name = ptext SLIT("The foreign declaration for") <+> ppr name \begin{code} rnInstDecl (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc) -- Used for both source and interface file decls - = pushSrcLocRn src_loc $ - rnHsSigType (text "an instance decl") inst_ty `thenRn` \ inst_ty' -> + = addSrcLoc src_loc $ + rnHsSigType (text "an instance decl") inst_ty `thenM` \ inst_ty' -> (case maybe_dfun_rdr_name of - Nothing -> returnRn Nothing - Just dfun_rdr_name -> lookupIfaceName dfun_rdr_name `thenRn` \ dfun_name -> - returnRn (Just dfun_name) - ) `thenRn` \ maybe_dfun_name -> + 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. - returnRn (InstDecl inst_ty' EmptyMonoBinds [] maybe_dfun_name src_loc) + returnM (InstDecl inst_ty' EmptyMonoBinds [] maybe_dfun_name src_loc) -- Compare finishSourceTyClDecl finishSourceInstDecl (InstDecl _ mbinds uprags _ _ ) @@ -178,21 +337,19 @@ finishSourceInstDecl (InstDecl _ mbinds uprags _ _ ) -- Used for both source decls only = ASSERT( not (maybeToBool maybe_dfun_name) ) -- Source decl! let - meth_doc = text "the bindings in an instance declaration" + meth_doc = text "In the bindings in an instance declaration" meth_names = collectLocatedMonoBinders mbinds - inst_tyvars = case inst_ty of - HsForAllTy (Just inst_tyvars) _ _ -> inst_tyvars - other -> [] + (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_` - extendTyVarEnvFVRn (map hsTyVarName inst_tyvars) ( - rnMethodBinds [] mbinds - ) `thenRn` \ (mbinds', meth_fvs) -> + checkDupNames meth_doc meth_names `thenM_` + extendTyVarEnvForMethodBinds inst_tyvars ( + rnMethodBinds cls [] mbinds + ) `thenM` \ (mbinds', meth_fvs) -> let binders = collectMonoBinders mbinds' binder_set = mkNameSet binders @@ -206,9 +363,9 @@ finishSourceInstDecl (InstDecl _ mbinds uprags _ _ ) -- But the (unqualified) method names are in scope bindLocalNames binders ( renameSigsFVs (okInstDclSig binder_set) uprags - ) `thenRn` \ (uprags', prag_fvs) -> + ) `thenM` \ (uprags', prag_fvs) -> - returnRn (InstDecl inst_ty mbinds' uprags' maybe_dfun_name src_loc, + returnM (InstDecl inst_ty mbinds' uprags' maybe_dfun_name src_loc, meth_fvs `plusFV` prag_fvs) \end{code} @@ -219,42 +376,82 @@ finishSourceInstDecl (InstDecl _ mbinds uprags _ _ ) %********************************************************* \begin{code} -rnIfaceRuleDecl (IfaceRule rule_name vars fn args rhs src_loc) - = pushSrcLocRn src_loc $ - lookupOccRn fn `thenRn` \ fn' -> +rnIfaceRuleDecl (IfaceRule rule_name act vars fn args rhs src_loc) + = addSrcLoc src_loc $ + lookupOccRn fn `thenM` \ fn' -> rnCoreBndrs vars $ \ vars' -> - mapRn rnCoreExpr args `thenRn` \ args' -> - rnCoreExpr rhs `thenRn` \ rhs' -> - returnRn (IfaceRule rule_name vars' fn' args' rhs' src_loc) + 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 tvs vars lhs rhs src_loc) - = ASSERT( null tvs ) - pushSrcLocRn src_loc $ +rnHsRuleDecl (HsRule rule_name act vars lhs rhs src_loc) + = addSrcLoc src_loc $ + bindPatSigTyVars (collectRuleBndrSigTys vars) $ - 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) -> + mapFvRn rn_var (vars `zip` ids) `thenM` \ (vars', fv_vars) -> - rnExpr lhs `thenRn` \ (lhs', fv_lhs) -> - rnExpr rhs `thenRn` \ (rhs', fv_rhs) -> - checkRn (validRuleLhs ids lhs') - (badRuleLhsErr rule_name lhs') `thenRn_` + 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 - mapRn (addErrRn . badRuleVar rule_name) bad_vars `thenRn_` - returnRn (HsRule rule_name sig_tvs' vars' lhs' rhs' src_loc, + 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 "the transformation rule" <+> ptext rule_name - sig_tvs = extractRuleBndrsTyVars vars + doc = text "In the transformation rule" <+> ftext rule_name get_var (RuleBndr v) = v get_var (RuleBndrSig v _) = v - rn_var (RuleBndr v, id) = returnRn (RuleBndr id, emptyFVs) - rn_var (RuleBndrSig v t, id) = rnHsTypeFVs doc t `thenRn` \ (t', fvs) -> - returnRn (RuleBndrSig id t', fvs) + 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} @@ -279,74 +476,65 @@ However, we can also do some scoping checks at the same time. \begin{code} rnTyClDecl (IfaceSig {tcdName = name, tcdType = ty, tcdIdInfo = id_infos, tcdLoc = loc}) - = pushSrcLocRn loc $ - lookupTopBndrRn name `thenRn` \ name' -> - rnHsType doc_str ty `thenRn` \ ty' -> - mapRn rnIdInfo id_infos `thenRn` \ id_infos' -> - returnRn (IfaceSig {tcdName = name', tcdType = ty', tcdIdInfo = id_infos', tcdLoc = loc}) + = 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 "the interface signature for" <+> quotes (ppr name) + doc_str = text "In the interface signature for" <+> quotes (ppr name) -rnTyClDecl (ForeignType {tcdName = name, tcdFoType = spec, tcdLoc = loc}) - = pushSrcLocRn loc $ - lookupTopBndrRn name `thenRn` \ name' -> - returnRn (ForeignType {tcdName = name', tcdFoType = spec, tcdLoc = loc}) +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, tcdNCons = nconstrs, - tcdLoc = src_loc, tcdSysNames = sys_names}) - = pushSrcLocRn src_loc $ - lookupTopBndrRn tycon `thenRn` \ 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 `thenRn` \ context' -> - checkDupOrQualNames data_doc con_names `thenRn_` - mapRn rnConDecl condecls `thenRn` \ condecls' -> - mapRn lookupSysBinder sys_names `thenRn` \ sys_names' -> - returnRn (TyData {tcdND = new_or_data, tcdCtxt = context', tcdName = tycon', - tcdTyVars = tyvars', tcdCons = condecls', tcdNCons = nconstrs, - tcdDerivs = Nothing, tcdLoc = src_loc, tcdSysNames = sys_names'}) + 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 "the data type declaration for" <+> quotes (ppr tycon) - con_names = map conDeclName condecls + 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}) - = pushSrcLocRn src_loc $ - doptRn Opt_GlasgowExts `thenRn` \ glaExts -> - lookupTopBndrRn name `thenRn` \ name' -> + = addSrcLoc src_loc $ + lookupTopBndrRn name `thenM` \ name' -> bindTyVarsRn syn_doc tyvars $ \ tyvars' -> - rnHsType syn_doc (unquantify glaExts ty) `thenRn` \ ty' -> - returnRn (TySynonym {tcdName = name', tcdTyVars = tyvars', tcdSynRhs = ty', tcdLoc = src_loc}) + rnHsType syn_doc ty `thenM` \ ty' -> + returnM (TySynonym {tcdName = name', tcdTyVars = tyvars', tcdSynRhs = ty', tcdLoc = src_loc}) where - syn_doc = text "the declaration for type synonym" <+> quotes (ppr name) - - -- For H98 we do *not* universally quantify on the RHS of a synonym - -- Silently discard context... but the tyvars in the rest won't be in scope - -- In interface files all types are quantified, so this is a no-op - unquantify glaExts (HsForAllTy Nothing ctxt ty) | glaExts = ty - unquantify glaExts ty = ty + syn_doc = text "In the declaration for type synonym" <+> quotes (ppr name) rnTyClDecl (ClassDecl {tcdCtxt = context, tcdName = cname, tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs, - tcdSysNames = names, tcdLoc = src_loc}) + tcdLoc = src_loc}) -- Used for both source and interface file decls - = pushSrcLocRn src_loc $ + = addSrcLoc src_loc $ - lookupTopBndrRn cname `thenRn` \ cname' -> + lookupTopBndrRn cname `thenM` \ cname' -> - -- Deal with the implicit tycon and datacon name - -- They aren't in scope (because they aren't visible to the user) - -- and what we want to do is simply look them up in the cache; - -- we jolly well ought to get a 'hit' there! - mapRn lookupSysBinder names `thenRn` \ names' -> - - -- Tyvars scope over bindings and context - bindTyVars2Rn cls_doc tyvars $ \ clas_tyvar_names tyvars' -> + -- Tyvars scope over superclass context and method signatures + bindTyVarsRn cls_doc tyvars $ \ tyvars' -> -- Check the superclasses - rnContext cls_doc context `thenRn` \ context' -> + rnContext cls_doc context `thenM` \ context' -> -- Check the functional dependencies - rnFds cls_doc fds `thenRn` \ fds' -> + rnFds cls_doc fds `thenM` \ fds' -> -- Check the signatures -- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs). @@ -354,61 +542,53 @@ rnTyClDecl (ClassDecl {tcdCtxt = context, tcdName = cname, (op_sigs, non_op_sigs) = partition isClassOpSig sigs sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs] in - checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_` - mapRn (rnClassOp cname' clas_tyvar_names fds') op_sigs `thenRn` \ sigs' -> + checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenM_` + mappM (rnClassOp cname' fds') op_sigs `thenM` \ sigs' -> let binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ] in - renameSigs (okClsDclSig binders) non_op_sigs `thenRn` \ non_ops' -> + renameSigs (okClsDclSig binders) non_op_sigs `thenM` \ non_ops' -> -- Typechecker is responsible for checking that we only -- give default-method bindings for things in this class. -- The renamer *could* check this for class decls, but can't -- for instance decls. - returnRn (ClassDecl { tcdCtxt = context', tcdName = cname', tcdTyVars = tyvars', - tcdFDs = fds', tcdSigs = non_ops' ++ sigs', tcdMeths = Nothing, - tcdSysNames = names', tcdLoc = src_loc}) + returnM (ClassDecl { tcdCtxt = context', tcdName = cname', tcdTyVars = tyvars', + tcdFDs = fds', tcdSigs = non_ops' ++ sigs', tcdMeths = Nothing, + tcdLoc = src_loc}) where - cls_doc = text "the declaration for class" <+> ppr cname - sig_doc = text "the signatures for class" <+> ppr cname + cls_doc = text "In the declaration for class" <+> ppr cname + sig_doc = text "In the signatures for class" <+> ppr cname -rnClassOp clas clas_tyvars clas_fds sig@(ClassOpSig op dm_stuff ty locn) - = pushSrcLocRn locn $ - lookupTopBndrRn op `thenRn` \ op_name -> +rnClassOp clas clas_fds sig@(ClassOpSig op dm_stuff ty locn) + = addSrcLoc locn $ + lookupTopBndrRn op `thenM` \ op_name -> -- Check the signature - rnHsSigType (quotes (ppr op)) ty `thenRn` \ new_ty -> + 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 - -- See comments with tname, snames, above - lookupSysBinder dm_rdr_name `thenRn` \ dm_name -> - returnRn (DefMeth dm_name) + 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 -> returnRn GenDefMeth - NoDefMeth -> returnRn NoDefMeth - ) `thenRn` \ dm_stuff' -> + GenDefMeth -> returnM GenDefMeth + NoDefMeth -> returnM NoDefMeth + ) `thenM` \ dm_stuff' -> - returnRn (ClassOpSig op_name dm_stuff' new_ty locn) + returnM (ClassOpSig op_name dm_stuff' new_ty locn) -finishSourceTyClDecl :: RdrNameTyClDecl -> RenamedTyClDecl -> RnMS (RenamedTyClDecl, FreeVars) +finishSourceTyClDecl :: RdrNameTyClDecl -> RenamedTyClDecl -> RnM (RenamedTyClDecl, FreeVars) -- Used for source file decls only -- Renames the default-bindings of a class decl - -- the derivings of a data decl -finishSourceTyClDecl (TyData {tcdDerivs = Just derivs, tcdLoc = src_loc}) -- Derivings in here - rn_ty_decl -- Everything else is here - = pushSrcLocRn src_loc $ - mapRn rnDeriv derivs `thenRn` \ derivs' -> - returnRn (rn_ty_decl {tcdDerivs = Just derivs'}, mkNameSet derivs') - finishSourceTyClDecl (ClassDecl {tcdMeths = Just mbinds, tcdLoc = src_loc}) -- Get mbinds from here - rn_cls_decl@(ClassDecl {tcdTyVars = tyvars}) -- Everything else is here + 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 @@ -420,23 +600,44 @@ finishSourceTyClDecl (ClassDecl {tcdMeths = Just mbinds, tcdLoc = src_loc}) -- G -- we want to name both "x" tyvars with the same unique, so that they are -- easy to group together in the typechecker. -- Hence the - pushSrcLocRn src_loc $ - extendTyVarEnvFVRn (map hsTyVarName tyvars) $ - getLocalNameEnv `thenRn` \ name_env -> + 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 `thenRn_` - newLocalsRn gen_rdr_tyvars_w_locs `thenRn` \ gen_tyvars -> - rnMethodBinds gen_tyvars mbinds `thenRn` \ (mbinds', meth_fvs) -> - returnRn (rn_cls_decl {tcdMeths = Just mbinds'}, meth_fvs) + 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 "the default-methods for class" <+> ppr (tcdName rn_cls_decl) + 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 -finishSourceTyClDecl _ tycl_decl = returnRn (tycl_decl, emptyFVs) - -- Not a class or data type declaration +\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} @@ -447,58 +648,63 @@ finishSourceTyClDecl _ tycl_decl = returnRn (tycl_decl, emptyFVs) %********************************************************* \begin{code} -rnDeriv :: RdrName -> RnMS Name -rnDeriv cls - = lookupOccRn cls `thenRn` \ clas_name -> - checkRn (getUnique clas_name `elem` derivableClassKeys) - (derivingNonStdClassErr clas_name) `thenRn_` - returnRn clas_name -\end{code} - -\begin{code} conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc) -conDeclName (ConDecl n _ _ _ _ l) = (n,l) - -rnConDecl :: RdrNameConDecl -> RnMS RenamedConDecl -rnConDecl (ConDecl name wkr tvs cxt details locn) - = pushSrcLocRn locn $ - checkConName name `thenRn_` - lookupTopBndrRn name `thenRn` \ new_name -> - - lookupSysBinder wkr `thenRn` \ new_wkr -> - -- See comments with ClassDecl +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 `thenRn` \ new_context -> - rnConDetails doc locn details `thenRn` \ new_details -> - returnRn (ConDecl new_name new_wkr new_tyvars new_context new_details locn) + rnContext doc cxt `thenM` \ new_context -> + rnConDetails doc locn details `thenM` \ new_details -> + returnM (ConDecl new_name new_tyvars new_context new_details locn) where - doc = text "the definition of data constructor" <+> quotes (ppr name) + doc = text "In the definition of data constructor" <+> quotes (ppr name) -rnConDetails doc locn (VanillaCon tys) - = mapRn (rnBangTy doc) tys `thenRn` \ new_tys -> - returnRn (VanillaCon new_tys) +rnConDetails doc locn (PrefixCon tys) + = mappM (rnBangTy doc) tys `thenM` \ new_tys -> + returnM (PrefixCon new_tys) rnConDetails doc locn (InfixCon ty1 ty2) - = rnBangTy doc ty1 `thenRn` \ new_ty1 -> - rnBangTy doc ty2 `thenRn` \ new_ty2 -> - returnRn (InfixCon new_ty1 new_ty2) + = rnBangTy doc ty1 `thenM` \ new_ty1 -> + rnBangTy doc ty2 `thenM` \ new_ty2 -> + returnM (InfixCon new_ty1 new_ty2) rnConDetails doc locn (RecCon fields) - = checkDupOrQualNames doc field_names `thenRn_` - mapRn (rnField doc) fields `thenRn` \ new_fields -> - returnRn (RecCon new_fields) + = checkDupOrQualNames doc field_names `thenM_` + mappM (rnField doc) fields `thenM` \ new_fields -> + returnM (RecCon new_fields) where - field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds] + field_names = [(fld, locn) | (fld, _) <- fields] -rnField doc (names, ty) - = mapRn lookupTopBndrRn names `thenRn` \ new_names -> - rnBangTy doc ty `thenRn` \ new_ty -> - returnRn (new_names, new_ty) +rnField doc (name, ty) + = lookupTopBndrRn name `thenM` \ new_name -> + rnBangTy doc ty `thenM` \ new_ty -> + returnM (new_name, new_ty) rnBangTy doc (BangType s ty) - = rnHsType doc ty `thenRn` \ new_ty -> - returnRn (BangType s new_ty) + = rnHsType doc ty `thenM` \ new_ty -> + returnM (BangType s new_ty) -- This data decl will parse OK -- data T = a Int @@ -511,8 +717,7 @@ rnBangTy doc (BangType s ty) -- from interface files, which always print in prefix form checkConName name - = checkRn (isRdrDataCon name) - (badDataCon name) + = checkErr (isRdrDataCon name) (badDataCon name) \end{code} @@ -523,166 +728,17 @@ checkConName name %********************************************************* \begin{code} -rnHsTypeFVs :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars) -rnHsTypeFVs doc_str ty - = rnHsType doc_str ty `thenRn` \ ty' -> - returnRn (ty', extractHsTyNames ty') - -rnHsSigTypeFVs :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars) -rnHsSigTypeFVs doc_str ty - = rnHsSigType doc_str ty `thenRn` \ ty' -> - returnRn (ty', extractHsTyNames ty') - -rnHsSigType :: SDoc -> RdrNameHsType -> RnMS RenamedHsType - -- rnHsSigType is used for source-language type signatures, - -- which use *implicit* universal quantification. -rnHsSigType doc_str ty - = rnHsType (text "the type signature for" <+> doc_str) ty - ---------------------------------------- -rnHsType :: SDoc -> RdrNameHsType -> RnMS RenamedHsType - -rnHsType doc (HsForAllTy Nothing ctxt ty) - -- Implicit quantifiction in source code (no kinds on tyvars) - -- Given the signature C => T we universally quantify - -- over FV(T) \ {in-scope-tyvars} - = getLocalNameEnv `thenRn` \ name_env -> - let - mentioned_in_tau = extractHsTyRdrTyVars ty - mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt - mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt) - forall_tyvars = filter (not . (`elemRdrEnv` name_env)) mentioned - in - rnForAll doc (map UserTyVar forall_tyvars) ctxt ty - -rnHsType doc (HsForAllTy (Just forall_tyvars) ctxt tau) - -- Explicit quantification. - -- Check that the forall'd tyvars are actually - -- mentioned in the type, and produce a warning if not - = let - mentioned_in_tau = extractHsTyRdrTyVars tau - mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt - mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt) - forall_tyvar_names = hsTyVarNames forall_tyvars - - -- Explicitly quantified but not mentioned in ctxt or tau - warn_guys = filter (`notElem` mentioned) forall_tyvar_names - in - mapRn_ (forAllWarn doc tau) warn_guys `thenRn_` - rnForAll doc forall_tyvars ctxt tau - -rnHsType doc (HsTyVar tyvar) - = lookupOccRn tyvar `thenRn` \ tyvar' -> - returnRn (HsTyVar tyvar') - -rnHsType doc (HsOpTy ty1 opname ty2) - = lookupOccRn opname `thenRn` \ name' -> - rnHsType doc ty1 `thenRn` \ ty1' -> - rnHsType doc ty2 `thenRn` \ ty2' -> - returnRn (HsOpTy ty1' name' ty2') - -rnHsType doc (HsNumTy i) - | i == 1 = returnRn (HsNumTy i) - | otherwise = failWithRn (HsNumTy i) - (ptext SLIT("Only unit numeric type pattern is valid")) - -rnHsType doc (HsFunTy ty1 ty2) - = rnHsType doc ty1 `thenRn` \ ty1' -> - -- Might find a for-all as the arg of a function type - rnHsType doc ty2 `thenRn` \ ty2' -> - -- Or as the result. This happens when reading Prelude.hi - -- when we find return :: forall m. Monad m -> forall a. a -> m a - returnRn (HsFunTy ty1' ty2') - -rnHsType doc (HsListTy ty) - = rnHsType doc ty `thenRn` \ ty' -> - returnRn (HsListTy ty') - --- Unboxed tuples are allowed to have poly-typed arguments. These --- sometimes crop up as a result of CPR worker-wrappering dictionaries. -rnHsType doc (HsTupleTy (HsTupCon _ boxity arity) tys) - -- Don't do lookupOccRn, because this is built-in syntax - -- so it doesn't need to be in scope - = mapRn (rnHsType doc) tys `thenRn` \ tys' -> - returnRn (HsTupleTy (HsTupCon tup_name boxity arity) tys') - where - tup_name = tupleTyCon_name boxity arity - - -rnHsType doc (HsAppTy ty1 ty2) - = rnHsType doc ty1 `thenRn` \ ty1' -> - rnHsType doc ty2 `thenRn` \ ty2' -> - returnRn (HsAppTy ty1' ty2') - -rnHsType doc (HsPredTy pred) - = rnPred doc pred `thenRn` \ pred' -> - returnRn (HsPredTy pred') - -rnHsTypes doc tys = mapRn (rnHsType doc) tys -\end{code} - -\begin{code} -rnForAll doc forall_tyvars ctxt ty - = bindTyVarsRn doc forall_tyvars $ \ new_tyvars -> - rnContext doc ctxt `thenRn` \ new_ctxt -> - rnHsType doc ty `thenRn` \ new_ty -> - returnRn (mkHsForAllTy (Just new_tyvars) new_ctxt new_ty) -\end{code} - -\begin{code} -rnContext :: SDoc -> RdrNameContext -> RnMS RenamedContext -rnContext doc ctxt - = mapRn rn_pred ctxt `thenRn` \ theta -> - - -- Check for duplicate assertions - -- If this isn't an error, then it ought to be: - ifOptRn Opt_WarnMisc ( - let - (_, dups) = removeDupsEq theta - -- We only have equality, not ordering - in - mapRn (addWarnRn . dupClassAssertWarn theta) dups - ) `thenRn_` - - returnRn theta - where - --Someone discovered that @CCallable@ and @CReturnable@ - -- could be used in contexts such as: - -- foo :: CCallable a => a -> PrimIO Int - -- Doing this utterly wrecks the whole point of introducing these - -- classes so we specifically check that this isn't being done. - rn_pred pred = rnPred doc pred `thenRn` \ pred'-> - checkRn (not (bad_pred pred')) - (naughtyCCallContextErr pred') `thenRn_` - returnRn pred' - - bad_pred (HsClassP clas _) = getUnique clas `elem` cCallishClassKeys - bad_pred other = False - - -rnPred doc (HsClassP clas tys) - = lookupOccRn clas `thenRn` \ clas_name -> - rnHsTypes doc tys `thenRn` \ tys' -> - returnRn (HsClassP clas_name tys') - -rnPred doc (HsIParam n ty) - = newIPName n `thenRn` \ name -> - rnHsType doc ty `thenRn` \ ty' -> - returnRn (HsIParam name ty') -\end{code} - -\begin{code} -rnFds :: SDoc -> [FunDep RdrName] -> RnMS [FunDep Name] +rnFds :: SDoc -> [FunDep RdrName] -> RnM [FunDep Name] rnFds doc fds - = mapRn rn_fds fds + = mappM rn_fds fds where rn_fds (tys1, tys2) - = rnHsTyVars doc tys1 `thenRn` \ tys1' -> - rnHsTyVars doc tys2 `thenRn` \ tys2' -> - returnRn (tys1', tys2') + = rnHsTyVars doc tys1 `thenM` \ tys1' -> + rnHsTyVars doc tys2 `thenM` \ tys2' -> + returnM (tys1', tys2') -rnHsTyVars doc tvs = mapRn (rnHsTyvar doc) tvs +rnHsTyVars doc tvs = mappM (rnHsTyvar doc) tvs rnHsTyvar doc tyvar = lookupOccRn tyvar \end{code} @@ -694,85 +750,81 @@ rnHsTyvar doc tyvar = lookupOccRn tyvar \begin{code} rnIdInfo (HsWorker worker arity) - = lookupOccRn worker `thenRn` \ worker' -> - returnRn (HsWorker worker' arity) - -rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ expr' -> - returnRn (HsUnfold inline expr') -rnIdInfo (HsStrictness str) = returnRn (HsStrictness str) -rnIdInfo (HsArity arity) = returnRn (HsArity arity) -rnIdInfo HsNoCafRefs = returnRn HsNoCafRefs -rnIdInfo HsCprInfo = returnRn HsCprInfo + = 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. \begin{code} rnCoreExpr (UfType ty) - = rnHsType (text "unfolding type") ty `thenRn` \ ty' -> - returnRn (UfType ty') + = rnHsType (text "unfolding type") ty `thenM` \ ty' -> + returnM (UfType ty') rnCoreExpr (UfVar v) - = lookupOccRn v `thenRn` \ v' -> - returnRn (UfVar v') + = lookupOccRn v `thenM` \ v' -> + returnM (UfVar v') rnCoreExpr (UfLit l) - = returnRn (UfLit l) + = returnM (UfLit l) rnCoreExpr (UfLitLit l ty) - = rnHsType (text "litlit") ty `thenRn` \ ty' -> - returnRn (UfLitLit l ty') + = rnHsType (text "litlit") ty `thenM` \ ty' -> + returnM (UfLitLit l ty') rnCoreExpr (UfFCall cc ty) - = rnHsType (text "ccall") ty `thenRn` \ ty' -> - returnRn (UfFCall cc ty') + = rnHsType (text "ccall") ty `thenM` \ ty' -> + returnM (UfFCall cc ty') -rnCoreExpr (UfTuple (HsTupCon _ boxity arity) args) - = mapRn rnCoreExpr args `thenRn` \ args' -> - returnRn (UfTuple (HsTupCon tup_name boxity arity) args') - where - tup_name = getName (dataConId (tupleCon boxity arity)) - -- Get the *worker* name and use that +rnCoreExpr (UfTuple (HsTupCon boxity arity) args) + = mappM rnCoreExpr args `thenM` \ args' -> + returnM (UfTuple (HsTupCon boxity arity) args') rnCoreExpr (UfApp fun arg) - = rnCoreExpr fun `thenRn` \ fun' -> - rnCoreExpr arg `thenRn` \ arg' -> - returnRn (UfApp fun' arg') + = rnCoreExpr fun `thenM` \ fun' -> + rnCoreExpr arg `thenM` \ arg' -> + returnM (UfApp fun' arg') rnCoreExpr (UfCase scrut bndr alts) - = rnCoreExpr scrut `thenRn` \ scrut' -> + = rnCoreExpr scrut `thenM` \ scrut' -> bindCoreLocalRn bndr $ \ bndr' -> - mapRn rnCoreAlt alts `thenRn` \ alts' -> - returnRn (UfCase scrut' bndr' alts') + 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 doc ty `thenRn` \ ty' -> + = rnHsType doc ty `thenM` \ ty' -> bindCoreLocalRn name $ \ name' -> thing_inside (UfValBinder name' ty') where @@ -790,60 +842,90 @@ rnCoreBndrs (b:bs) thing_inside = rnCoreBndr b $ \ name' -> \begin{code} rnCoreAlt (con, bndrs, rhs) - = rnUfCon con `thenRn` \ con' -> + = rnUfCon con `thenM` \ con' -> bindCoreLocalsRn bndrs $ \ bndrs' -> - rnCoreExpr rhs `thenRn` \ rhs' -> - returnRn (con', bndrs', rhs') + rnCoreExpr rhs `thenM` \ rhs' -> + returnM (con', bndrs', rhs') rnNote (UfCoerce ty) - = rnHsType (text "unfolding coerce") ty `thenRn` \ ty' -> - returnRn (UfCoerce ty') + = rnHsType (text "unfolding coerce") ty `thenM` \ ty' -> + returnM (UfCoerce ty') -rnNote (UfSCC cc) = returnRn (UfSCC cc) -rnNote UfInlineCall = returnRn UfInlineCall -rnNote UfInlineMe = returnRn UfInlineMe +rnNote (UfSCC cc) = returnM (UfSCC cc) +rnNote UfInlineCall = returnM UfInlineCall +rnNote UfInlineMe = returnM UfInlineMe rnUfCon UfDefault - = returnRn UfDefault + = returnM UfDefault -rnUfCon (UfTupleAlt (HsTupCon _ boxity arity)) - = returnRn (UfTupleAlt (HsTupCon tup_name boxity arity)) - where - tup_name = getName (tupleCon boxity arity) +rnUfCon (UfTupleAlt tup_con) + = returnM (UfTupleAlt tup_con) rnUfCon (UfDataAlt con) - = lookupOccRn con `thenRn` \ con' -> - returnRn (UfDataAlt con') + = lookupOccRn con `thenM` \ con' -> + returnM (UfDataAlt con') rnUfCon (UfLitAlt lit) - = returnRn (UfLitAlt lit) + = returnM (UfLitAlt lit) rnUfCon (UfLitLitAlt lit ty) - = rnHsType (text "litlit") ty `thenRn` \ ty' -> - returnRn (UfLitLitAlt lit ty') + = rnHsType (text "litlit") ty `thenM` \ ty' -> + returnM (UfLitLitAlt lit ty') \end{code} %********************************************************* -%* * -\subsection{Rule shapes} -%* * +%* * +\subsection{Statistics} +%* * %********************************************************* -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 +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 - check (OpApp _ op _ _) = check op - check (HsApp e1 e2) = check e1 - check (HsVar v) | v `notElem` foralls = True - check other = False -\end{code} + n_mods = length [() | _ <- moduleEnvElts (eps_PIT eps)] + -- This is really only right for a one-shot compile + (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} %********************************************************* %* * @@ -852,48 +934,22 @@ validRuleLhs foralls lhs %********************************************************* \begin{code} -derivingNonStdClassErr clas - = hsep [ptext SLIT("non-standard class"), ppr clas, ptext SLIT("in deriving clause")] - badDataCon name = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)] -forAllWarn doc ty tyvar - = ifOptRn Opt_WarnUnusedMatches $ - getModeRn `thenRn` \ mode -> - case mode of { -#ifndef DEBUG - InterfaceMode -> returnRn () ; -- Don't warn of unused tyvars in interface files - -- unless DEBUG is on, in which case it is slightly - -- informative. They can arise from mkRhsTyLam, -#endif -- leading to (say) f :: forall a b. [b] -> [b] - other -> - addWarnRn ( - sep [ptext SLIT("The universally quantified type variable") <+> quotes (ppr tyvar), - nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))] - $$ - (ptext SLIT("In") <+> doc) - ) - } - -badRuleLhsErr name lhs - = sep [ptext SLIT("Rule") <+> ptext name <> colon, - nest 4 (ptext SLIT("Illegal left-hand side:") <+> ppr lhs)] +badRuleLhsErr name lhs (Just bad_e) + = sep [ptext SLIT("Rule") <+> ftext name <> colon, + nest 4 (vcat [ptext SLIT("Illegal expression:") <+> ppr bad_e, + ptext SLIT("in left-hand side:") <+> ppr lhs])] $$ ptext SLIT("LHS must be of form (f e1 .. en) where f is not forall'd") badRuleVar name var - = sep [ptext SLIT("Rule") <+> doubleQuotes (ptext name) <> colon, + = 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")] -dupClassAssertWarn ctxt (assertion : dups) - = sep [hsep [ptext SLIT("Duplicate class assertion"), - quotes (ppr assertion), - ptext SLIT("in the context:")], - nest 4 (pprHsContext ctxt <+> ptext SLIT("..."))] - -naughtyCCallContextErr (HsClassP clas _) - = sep [ptext SLIT("Can't use class") <+> quotes (ppr clas), - ptext SLIT("in a context")] +emptyConDeclsErr tycon + = sep [quotes (ppr tycon) <+> ptext SLIT("has no constructors"), + nest 4 (ptext SLIT("(-fglasgow-exts permits this)"))] \end{code}