X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Ftypecheck%2FTcModule.lhs;h=34a82d1049bb95fccb9f5a69e236f94c4ce58e75;hb=fe69f3c1d6062b90635963aa414c33951bf18427;hp=d2163149a0ab6a0b3cb90c17356675f2d0e70ff1;hpb=28139aea50376444d56f43f0914291348a51a7e7;p=ghc-hetmet.git diff --git a/ghc/compiler/typecheck/TcModule.lhs b/ghc/compiler/typecheck/TcModule.lhs index d216314..34a82d1 100644 --- a/ghc/compiler/typecheck/TcModule.lhs +++ b/ghc/compiler/typecheck/TcModule.lhs @@ -1,67 +1,63 @@ % -% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996 +% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998 % \section[TcModule]{Typechecking a whole module} \begin{code} module TcModule ( typecheckModule, - TcResults, - TcDDumpDeriv + TcResults(..) ) where #include "HsVersions.h" -import CmdLineOpts ( opt_D_dump_tc, opt_D_dump_deriv ) +import CmdLineOpts ( opt_D_dump_tc, opt_D_dump_types, opt_PprStyle_Debug ) import HsSyn ( HsModule(..), HsBinds(..), MonoBinds(..), HsDecl(..) ) -import RnHsSyn ( RenamedHsModule, RenamedFixityDecl(..) ) -import TcHsSyn ( TypecheckedHsBinds, TypecheckedHsExpr, - TypecheckedDictBinds, TcMonoBinds, - TypecheckedMonoBinds, - zonkTopBinds ) +import HsTypes ( toHsType ) +import RnHsSyn ( RenamedHsModule ) +import TcHsSyn ( TcMonoBinds, TypecheckedMonoBinds, + TypecheckedForeignDecl, TypecheckedRuleDecl, + zonkTopBinds, zonkForeignExports, zonkRules + ) import TcMonad import Inst ( Inst, emptyLIE, plusLIE ) import TcBinds ( tcTopBindsAndThen ) -import TcClassDcl ( tcClassDecls2 ) +import TcClassDcl ( tcClassDecls2, mkImplicitClassBinds ) import TcDefaults ( tcDefaults ) -import TcEnv ( TcIdOcc(..), tcExtendGlobalValEnv, tcExtendTyConEnv, getEnv_LocalIds, - getEnv_TyCons, getEnv_Classes, tcLookupLocalValue, - tcLookupLocalValueByKey, tcLookupTyCon, - tcLookupGlobalValueByKeyMaybe ) -import TcExpr ( tcId ) +import TcEnv ( tcExtendGlobalValEnv, tcExtendTypeEnv, + getEnvTyCons, getEnvClasses, tcLookupValueByKeyMaybe, + tcSetValueEnv, tcSetInstEnv, + initEnv, + ValueEnv, + ) +import TcRules ( tcRules ) +import TcForeign ( tcForeignImports, tcForeignExports ) import TcIfaceSig ( tcInterfaceSigs ) import TcInstDcls ( tcInstDecls1, tcInstDecls2 ) -import TcInstUtil ( buildInstanceEnvs, classDataCon, InstInfo ) +import TcInstUtil ( buildInstanceEnv, InstInfo ) import TcSimplify ( tcSimplifyTop ) -import TcTyClsDecls ( tcTyAndClassDecls1 ) -import TcTyDecls ( mkDataBinds ) -import TcType ( TcType, tcInstType ) -import TcKind ( TcKind, kindToTcKind ) +import TcTyClsDecls ( tcTyAndClassDecls ) +import TcTyDecls ( mkImplicitDataBinds ) +import TcType ( TcType, TcKind ) -import RnMonad ( RnNameSupply(..) ) +import RnMonad ( RnNameSupply, FixityEnv ) import Bag ( isEmptyBag ) -import ErrUtils ( WarnMsg, ErrMsg, - pprBagOfErrors, dumpIfSet, ghcExit +import ErrUtils ( Message, printErrorsAndWarnings, dumpIfSet ) +import Id ( Id, idType, idName ) +import Module ( pprModuleName, mkThisModule ) +import OccName ( isSysOcc ) +import Name ( Name, nameUnique, nameOccName, isLocallyDefined, + toRdrName, nameEnvElts, NamedThing(..) ) -import Id ( idType, GenId, IdEnv, nullIdEnv ) -import Maybes ( catMaybes, MaybeErr(..) ) -import Name ( Name, isLocallyDefined, pprModule, NamedThing(..) ) -import TyCon ( TyCon, isSynTyCon, tyConKind ) +import TyCon ( TyCon, tyConKind, tyConClass_maybe ) import Class ( Class, classSelIds, classTyCon ) -import Type ( mkTyConApp, mkSynTy, Type ) -import TyVar ( emptyTyVarEnv ) -import TysWiredIn ( unitTy ) -import PrelMods ( pREL_MAIN, mAIN ) -import PrelInfo ( main_NAME, ioTyCon_NAME ) -import Unify ( unifyTauTy ) -import UniqFM ( lookupUFM_Directly, lookupWithDefaultUFM_Directly, - filterUFM, eltsUFM ) -import Unique ( Unique ) +import PrelInfo ( mAIN_Name ) +import Unique ( Unique, mainKey ) import UniqSupply ( UniqSupply ) +import Maybes ( maybeToBool ) import Util import Bag ( Bag, isEmptyBag ) -import FiniteMap ( emptyFM, FiniteMap ) import Outputable \end{code} @@ -69,56 +65,75 @@ Outside-world interface: \begin{code} -- Convenient type synonyms first: -type TcResults - = (TypecheckedMonoBinds, - [TyCon], [Class], - Bag InstInfo, -- Instance declaration information - TcDDumpDeriv) - -type TcDDumpDeriv = SDoc +data TcResults + = TcResults { + tc_binds :: TypecheckedMonoBinds, + tc_tycons :: [TyCon], + tc_classes :: [Class], + tc_insts :: Bag InstInfo, -- Instance declaration information + tc_fords :: [TypecheckedForeignDecl], -- Foreign import & exports. + tc_rules :: [TypecheckedRuleDecl], -- Transformation rules + tc_env :: ValueEnv + } --------------- typecheckModule :: UniqSupply -> RnNameSupply + -> FixityEnv -> RenamedHsModule -> IO (Maybe TcResults) -typecheckModule us rn_name_supply mod - = let - (maybe_result, warns, errs) = initTc us (tcModule rn_name_supply mod) - in - print_errs warns >> - print_errs errs >> - - dumpIfSet opt_D_dump_tc "Typechecked" - (case maybe_result of - Just (binds, _, _, _, _) -> ppr binds - Nothing -> text "Typecheck failed") >> - - dumpIfSet opt_D_dump_deriv "Derived instances" - (case maybe_result of - Just (_, _, _, _, dump_deriv) -> dump_deriv - Nothing -> empty) >> - +typecheckModule us rn_name_supply fixity_env mod + = initTc us initEnv (tcModule rn_name_supply fixity_env mod) >>= \ (maybe_result, warns, errs) -> + + printErrorsAndWarnings errs warns >> + + (case maybe_result of + Nothing -> return () + Just results -> dumpIfSet opt_D_dump_types "Type signatures" (dump_sigs results) >> + dumpIfSet opt_D_dump_tc "Typechecked" (dump_tc results) + ) >> + return (if isEmptyBag errs then maybe_result else Nothing) -print_errs errs - | isEmptyBag errs = return () - | otherwise = printErrs (pprBagOfErrors errs) +dump_tc results + = ppr (tc_binds results) $$ pp_rules (tc_rules results) + +dump_sigs results -- Print type signatures + = -- Convert to HsType so that we get source-language style printing + -- And sort by RdrName + vcat $ map ppr_sig $ sortLt lt_sig $ + [(toRdrName id, toHsType (idType id)) | id <- nameEnvElts (tc_env results), + want_sig id + ] + where + lt_sig (n1,_) (n2,_) = n1 < n2 + ppr_sig (n,t) = ppr n <+> dcolon <+> ppr t + + want_sig id | opt_PprStyle_Debug = True + | otherwise = isLocallyDefined n && not (isSysOcc (nameOccName n)) + where + n = idName id + +pp_rules [] = empty +pp_rules rs = vcat [ptext SLIT("{-# RULES"), + nest 4 (vcat (map ppr rs)), + ptext SLIT("#-}")] \end{code} The internal monster: \begin{code} tcModule :: RnNameSupply -- for renaming derivings + -> FixityEnv -- needed for Show/Read derivings. -> RenamedHsModule -- input -> TcM s TcResults -- output -tcModule rn_name_supply - (HsModule mod_name verion exports imports fixities decls src_loc) +tcModule rn_name_supply fixities + (HsModule mod_name _ _ _ decls _ src_loc) = tcAddSrcLoc src_loc $ -- record where we're starting fixTc (\ ~(unf_env ,_) -> @@ -126,125 +141,141 @@ tcModule rn_name_supply -- which is done lazily [ie failure just drops the pragma -- without having any global-failure effect]. -- - -- unf_env is also used to get the pragam info for dfuns. + -- unf_env is also used to get the pragam info + -- for imported dfuns and default methods - -- The knot for instance information. This isn't used at all - -- till we type-check value declarations - fixTc ( \ ~(rec_inst_mapper, _, _, _, _) -> - -- Type-check the type and class decls - -- trace "tcTyAndClassDecls:" $ - tcTyAndClassDecls1 unf_env rec_inst_mapper decls `thenTc` \ env -> + tcTyAndClassDecls unf_env decls `thenTc` \ env -> - -- trace "tc3" $ - -- Typecheck the instance decls, includes deriving - tcSetEnv env ( - -- trace "tcInstDecls:" $ - tcInstDecls1 unf_env decls mod_name rn_name_supply - ) `thenTc` \ (inst_info, deriv_binds, ddump_deriv) -> - - -- trace "tc4" $ - buildInstanceEnvs inst_info `thenNF_Tc` \ inst_mapper -> - - returnTc (inst_mapper, env, inst_info, deriv_binds, ddump_deriv) - - -- End of inner fix loop - ) `thenTc` \ (_, env, inst_info, deriv_binds, ddump_deriv) -> + -- Typecheck the instance decls, includes deriving + tcSetEnv env $ + + tcInstDecls1 unf_env decls + (mkThisModule mod_name) + fixities rn_name_supply `thenTc` \ (inst_info, deriv_binds) -> - -- trace "tc5" $ - tcSetEnv env $ + buildInstanceEnv inst_info `thenNF_Tc` \ inst_env -> + + tcSetInstEnv inst_env $ + let + classes = getEnvClasses env + tycons = getEnvTyCons env -- INCLUDES tycons derived from classes + local_classes = filter isLocallyDefined classes + local_tycons = [ tc | tc <- tycons, + isLocallyDefined tc, + Nothing <- [tyConClass_maybe tc] + ] + -- For local_tycons, filter out the ones derived from classes + -- Otherwise the latter show up in interface files + in -- Default declarations tcDefaults decls `thenTc` \ defaulting_tys -> tcSetDefaultTys defaulting_tys $ + -- Interface type signatures + -- We tie a knot so that the Ids read out of interfaces are in scope + -- when we read their pragmas. + -- What we rely on is that pragmas are typechecked lazily; if + -- any type errors are found (ie there's an inconsistency) + -- we silently discard the pragma + -- We must do this before mkImplicitDataBinds (which comes next), since + -- the latter looks up unpackCStringId, for example, which is usually + -- imported + tcInterfaceSigs unf_env decls `thenTc` \ sig_ids -> + tcExtendGlobalValEnv sig_ids $ + -- Create any necessary record selector Ids and their bindings -- "Necessary" includes data and newtype declarations - let - tycons = getEnv_TyCons env - classes = getEnv_Classes env - local_tycons = filter isLocallyDefined tycons - local_classes = filter isLocallyDefined classes - in - mkDataBinds tycons `thenTc` \ (data_ids, data_binds) -> + -- We don't create bindings for dictionary constructors; + -- they are always fully applied, and the bindings are just there + -- to support partial applications + mkImplicitDataBinds tycons `thenTc` \ (data_ids, imp_data_binds) -> + mkImplicitClassBinds classes `thenNF_Tc` \ (cls_ids, imp_cls_binds) -> -- Extend the global value environment with -- (a) constructors -- (b) record selectors -- (c) class op selectors - -- (d) default-method ids - tcExtendGlobalValEnv data_ids $ - tcExtendGlobalValEnv (concat (map classSelIds classes)) $ - - -- Extend the TyCon envt with the tycons corresponding to - -- the classes, and the global value environment with the - -- corresponding data cons. - -- They are mentioned in types in interface files. - tcExtendGlobalValEnv (map classDataCon classes) $ - tcExtendTyConEnv [ (getName tycon, (kindToTcKind (tyConKind tycon), Nothing, tycon)) - | clas <- classes, - let tycon = classTyCon clas - ] $ - - -- Interface type signatures - -- We tie a knot so that the Ids read out of interfaces are in scope - -- when we read their pragmas. - -- What we rely on is that pragmas are typechecked lazily; if - -- any type errors are found (ie there's an inconsistency) - -- we silently discard the pragma - tcInterfaceSigs unf_env decls `thenTc` \ sig_ids -> - tcExtendGlobalValEnv sig_ids $ + -- (d) default-method ids... where? I can't see where these are + -- put into the envt, and I'm worried that the zonking phase + -- will find they aren't there and complain. + tcExtendGlobalValEnv data_ids $ + tcExtendGlobalValEnv cls_ids $ + -- foreign import declarations next. + tcForeignImports decls `thenTc` \ (fo_ids, foi_decls) -> + tcExtendGlobalValEnv fo_ids $ -- Value declarations next. -- We also typecheck any extra binds that came out of the "deriving" process - -- trace "tcBinds:" $ tcTopBindsAndThen (\ is_rec binds1 (binds2, thing) -> (binds1 `AndMonoBinds` binds2, thing)) (get_val_decls decls `ThenBinds` deriv_binds) - ( tcGetEnv `thenNF_Tc` \ env -> + ( tcGetEnv `thenNF_Tc` \ env -> + tcGetUnique `thenNF_Tc` \ uniq -> returnTc ((EmptyMonoBinds, env), emptyLIE) ) `thenTc` \ ((val_binds, final_env), lie_valdecls) -> tcSetEnv final_env $ + -- foreign export declarations next. + tcForeignExports decls `thenTc` \ (lie_fodecls, foe_binds, foe_decls) -> -- Second pass over class and instance declarations, -- to compile the bindings themselves. - -- trace "tc8" $ tcInstDecls2 inst_info `thenNF_Tc` \ (lie_instdecls, inst_binds) -> - tcClassDecls2 decls `thenNF_Tc` \ (lie_clasdecls, cls_binds) -> + tcClassDecls2 decls `thenNF_Tc` \ (lie_clasdecls, cls_dm_binds) -> + tcRules decls `thenNF_Tc` \ (lie_rules, rules) -> - - -- Check that "main" has the right signature - tcCheckMainSig mod_name `thenTc_` - -- Deal with constant or ambiguous InstIds. How could -- there be ambiguous ones? They can only arise if a -- top-level decl falls under the monomorphism -- restriction, and no subsequent decl instantiates its -- type. (Usually, ambiguous type variables are resolved -- during the generalisation step.) - -- trace "tc9" $ let - lie_alldecls = lie_valdecls `plusLIE` lie_instdecls `plusLIE` lie_clasdecls + lie_alldecls = lie_valdecls `plusLIE` + lie_instdecls `plusLIE` + lie_clasdecls `plusLIE` + lie_fodecls `plusLIE` + lie_rules in tcSimplifyTop lie_alldecls `thenTc` \ const_inst_binds -> + -- Check that Main defines main + (if mod_name == mAIN_Name then + tcLookupValueByKeyMaybe mainKey `thenNF_Tc` \ maybe_main -> + checkTc (maybeToBool maybe_main) noMainErr + else + returnTc () + ) `thenTc_` -- Backsubstitution. This must be done last. - -- Even tcCheckMainSig and tcSimplifyTop may do some unification. + -- Even tcSimplifyTop may do some unification. let - all_binds = data_binds `AndMonoBinds` + all_binds = imp_data_binds `AndMonoBinds` + imp_cls_binds `AndMonoBinds` val_binds `AndMonoBinds` inst_binds `AndMonoBinds` - cls_binds `AndMonoBinds` - const_inst_binds + cls_dm_binds `AndMonoBinds` + const_inst_binds `AndMonoBinds` + foe_binds in - zonkTopBinds all_binds `thenNF_Tc` \ (all_binds', really_final_env) -> + zonkTopBinds all_binds `thenNF_Tc` \ (all_binds', really_final_env) -> + tcSetValueEnv really_final_env $ + zonkForeignExports foe_decls `thenNF_Tc` \ foe_decls' -> + zonkRules rules `thenNF_Tc` \ rules' -> returnTc (really_final_env, - (all_binds', local_tycons, local_classes, inst_info, ddump_deriv)) + (TcResults { tc_binds = all_binds', + tc_tycons = local_tycons, + tc_classes = local_classes, + tc_insts = inst_info, + tc_fords = foi_decls ++ foe_decls', + tc_rules = rules', + tc_env = really_final_env + })) -- End of outer fix loop ) `thenTc` \ (final_env, stuff) -> @@ -255,43 +286,8 @@ get_val_decls decls = foldr ThenBinds EmptyBinds [binds | ValD binds <- decls] \begin{code} -tcCheckMainSig mod_name - | mod_name /= mAIN - = returnTc () -- A non-main module - - | otherwise - = -- Check that main is defined - tcLookupTyCon ioTyCon_NAME `thenTc` \ (_,_,ioTyCon) -> - tcLookupLocalValue main_NAME `thenNF_Tc` \ maybe_main_id -> - case maybe_main_id of { - Nothing -> failWithTc noMainErr ; - Just main_id -> - - -- Check that it has the right type (or a more general one) - let - expected_ty = mkTyConApp ioTyCon [unitTy] - in - tcInstType emptyTyVarEnv expected_ty `thenNF_Tc` \ expected_tau -> - tcId main_NAME `thenNF_Tc` \ (_, lie, main_tau) -> - tcSetErrCtxt mainTyCheckCtxt $ - unifyTauTy expected_tau - main_tau `thenTc_` - checkTc (isEmptyBag lie) (mainTyMisMatch expected_ty (idType main_id)) - } - - -mainTyCheckCtxt - = hsep [ptext SLIT("When checking that"), ppr main_NAME, ptext SLIT("has the required type")] - noMainErr - = hsep [ptext SLIT("Module"), quotes (pprModule mAIN), - ptext SLIT("must include a definition for"), quotes (ppr main_NAME)] - -mainTyMisMatch :: Type -> TcType s -> ErrMsg -mainTyMisMatch expected actual - = hang (hsep [ppr main_NAME, ptext SLIT("has the wrong type")]) - 4 (vcat [ - hsep [ptext SLIT("Expected:"), ppr expected], - hsep [ptext SLIT("Inferred:"), ppr actual] - ]) + = hsep [ptext SLIT("Module"), quotes (pprModuleName mAIN_Name), + ptext SLIT("must include a definition for"), quotes (ptext SLIT("main"))] \end{code} +