X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Ftypecheck%2FTcModule.lhs;h=3bd6902b408dc06f9313bf107ff28282823d819a;hb=f43ebad1020dccdf6fde2fddc91994b27d0f565e;hp=4fc393756534722b3939a0b44685e07a643f9539;hpb=111cee3f1ad93816cb828e38b38521d85c3bcebb;p=ghc-hetmet.git diff --git a/ghc/compiler/typecheck/TcModule.lhs b/ghc/compiler/typecheck/TcModule.lhs index 4fc3937..3bd6902 100644 --- a/ghc/compiler/typecheck/TcModule.lhs +++ b/ghc/compiler/typecheck/TcModule.lhs @@ -5,67 +5,60 @@ \begin{code} module TcModule ( - typecheckModule, - TcResults(..) + typecheckModule, typecheckExpr, TcResults(..) ) where #include "HsVersions.h" -import CmdLineOpts ( opt_D_dump_tc ) -import HsSyn ( HsModule(..), HsBinds(..), MonoBinds(..), HsDecl(..) ) -import RnHsSyn ( RenamedHsModule ) -import TcHsSyn ( TcMonoBinds, TypecheckedMonoBinds, +import CmdLineOpts ( DynFlag(..), DynFlags, opt_PprStyle_Debug ) +import HsSyn ( HsBinds(..), MonoBinds(..), HsDecl(..), + isIfaceRuleDecl, nullBinds, andMonoBindList + ) +import HsTypes ( toHsType ) +import RnHsSyn ( RenamedHsBinds, RenamedHsDecl, RenamedHsExpr ) +import TcHsSyn ( TypecheckedMonoBinds, TypecheckedHsExpr, TypecheckedForeignDecl, TypecheckedRuleDecl, - zonkTopBinds, zonkForeignExports, zonkRules + zonkTopBinds, zonkForeignExports, zonkRules, mkHsLet, + zonkExpr ) + import TcMonad -import Inst ( Inst, emptyLIE, plusLIE ) -import TcBinds ( tcTopBindsAndThen ) -import TcClassDcl ( tcClassDecls2, mkImplicitClassBinds ) -import TcDefaults ( tcDefaults ) -import TcEnv ( tcExtendGlobalValEnv, tcExtendTypeEnv, - getEnvTyCons, getEnvClasses, tcLookupValueMaybe, - explicitLookupValueByKey, tcSetValueEnv, - tcLookupTyCon, initEnv, - ValueEnv, TcTyThing(..) +import TcType ( newTyVarTy, zonkTcType ) +import Inst ( plusLIE ) +import TcBinds ( tcTopBinds ) +import TcClassDcl ( tcClassDecls2 ) +import TcDefaults ( tcDefaults, defaultDefaultTys ) +import TcExpr ( tcMonoExpr ) +import TcEnv ( TcEnv, InstInfo, tcExtendGlobalValEnv, + isLocalThing, tcSetEnv, tcSetInstEnv, initTcEnv, getTcGEnv ) -import TcExpr ( tcId ) -import TcRules ( tcRules ) +import TcRules ( tcIfaceRules, tcSourceRules ) import TcForeign ( tcForeignImports, tcForeignExports ) import TcIfaceSig ( tcInterfaceSigs ) import TcInstDcls ( tcInstDecls1, tcInstDecls2 ) -import TcInstUtil ( buildInstanceEnvs, classDataCon, InstInfo ) import TcSimplify ( tcSimplifyTop ) import TcTyClsDecls ( tcTyAndClassDecls ) -import TcTyDecls ( mkImplicitDataBinds ) -import TcType ( TcType, typeToTcType, - TcKind, kindToTcKind, - newTyVarTy - ) -import RnMonad ( RnNameSupply, getIfaceFixities, Fixities, InterfaceDetails ) +import CoreUnfold ( unfoldingTemplate, hasUnfolding ) +import Type ( funResultTy, splitForAllTys, openTypeKind ) import Bag ( isEmptyBag ) -import ErrUtils ( Message, printErrorsAndWarnings, dumpIfSet ) -import Id ( Id, idType ) -import Module ( pprModuleName ) -import Name ( Name, nameUnique, isLocallyDefined, NamedThing(..) ) -import TyCon ( TyCon, tyConKind ) -import Class ( Class, classSelIds, classTyCon ) -import Type ( mkTyConApp, mkForAllTy, - boxedTypeKind, getTyVar, Type ) -import TysWiredIn ( unitTy ) -import PrelMods ( mAIN_Name ) -import PrelInfo ( main_NAME, thinAirIdNames, setThinAirIds ) -import TcUnify ( unifyTauTy ) -import Unique ( Unique ) -import UniqSupply ( UniqSupply ) -import Maybes ( maybeToBool ) +import ErrUtils ( printErrorsAndWarnings, dumpIfSet_dyn, showPass ) +import Id ( idType, idUnfolding ) +import Module ( Module ) +import Name ( Name, toRdrName ) +import Name ( nameEnvElts, lookupNameEnv ) +import TyCon ( tyConGenInfo ) import Util -import Bag ( Bag, isEmptyBag ) +import BasicTypes ( EP(..), Fixity ) +import Bag ( isEmptyBag ) import Outputable - -import IOExts +import HscTypes ( PersistentCompilerState(..), HomeSymbolTable, + PackageTypeEnv, ModIface(..), + TypeEnv, extendTypeEnvList, + TyThing(..), implicitTyThingIds, + mkTypeEnv + ) \end{code} Outside-world interface: @@ -74,232 +67,322 @@ Outside-world interface: -- Convenient type synonyms first: data TcResults = TcResults { - tc_binds :: TypecheckedMonoBinds, - tc_tycons :: [TyCon], - tc_classes :: [Class], - tc_insts :: Bag InstInfo, -- Instance declaration information + -- All these fields have info *just for this module* + tc_env :: TypeEnv, -- The top level TypeEnv + tc_binds :: TypecheckedMonoBinds, -- Bindings tc_fords :: [TypecheckedForeignDecl], -- Foreign import & exports. - tc_rules :: [TypecheckedRuleDecl], -- Transformation rules - tc_env :: ValueEnv, - tc_thinair :: [Id] -- The thin-air Ids + tc_rules :: [TypecheckedRuleDecl] -- Transformation rules } --------------- typecheckModule - :: UniqSupply - -> RnNameSupply - -> InterfaceDetails - -> RenamedHsModule - -> IO (Maybe TcResults) - -typecheckModule us rn_name_supply iface_det mod - = initTc us initEnv (tcModule rn_name_supply (getIfaceFixities iface_det) mod) - >>= \ (maybe_result, warns, errs) -> - - printErrorsAndWarnings errs warns >> - - -- write the thin-air Id map - (case maybe_result of - Just results -> setThinAirIds (tc_thinair results) - Nothing -> return () - ) >> - - dumpIfSet opt_D_dump_tc "Typechecked" - (case maybe_result of - Just results -> ppr (tc_binds results) - $$ - pp_rules (tc_rules results) - Nothing -> text "Typecheck failed") >> - - return (if isEmptyBag errs then - maybe_result - else - Nothing) + :: DynFlags + -> PersistentCompilerState + -> HomeSymbolTable + -> ModIface -- Iface for this module + -> PrintUnqualified -- For error printing + -> [RenamedHsDecl] + -> IO (Maybe (PersistentCompilerState, TcResults)) + -- The new PCS is Augmented with imported information, + -- (but not stuff from this module) + + +typecheckModule dflags pcs hst mod_iface unqual decls + = do { maybe_tc_result <- typecheck dflags pcs hst unqual $ + tcModule pcs hst get_fixity this_mod decls + ; printTcDump dflags maybe_tc_result + ; return maybe_tc_result } + where + this_mod = mi_module mod_iface + fixity_env = mi_fixities mod_iface + + get_fixity :: Name -> Maybe Fixity + get_fixity nm = lookupNameEnv fixity_env nm -pp_rules [] = empty -pp_rules rs = vcat [ptext SLIT("{-# RULES"), - nest 4 (vcat (map ppr rs)), - ptext SLIT("#-}")] +--------------- +typecheckExpr :: DynFlags + -> PersistentCompilerState + -> HomeSymbolTable + -> PrintUnqualified -- For error printing + -> Module + -> (RenamedHsExpr, -- The expression itself + [RenamedHsDecl]) -- Plus extra decls it sucked in from interface files + -> IO (Maybe (PersistentCompilerState, TypecheckedHsExpr, TcType)) + +typecheckExpr dflags pcs hst unqual this_mod (expr, decls) + = typecheck dflags pcs hst unqual $ + + -- use the default default settings, i.e. [Integer, Double] + tcSetDefaultTys defaultDefaultTys $ + tcImports pcs hst get_fixity this_mod decls `thenTc` \ (env, new_pcs, local_inst_info, deriv_binds, local_rules) -> + ASSERT( null local_inst_info && nullBinds deriv_binds && null local_rules ) + + tcSetEnv env $ + newTyVarTy openTypeKind `thenTc` \ ty -> + tcMonoExpr expr ty `thenTc` \ (expr', lie) -> + tcSimplifyTop lie `thenTc` \ binds -> + let all_expr = mkHsLet binds expr' in + zonkExpr all_expr `thenNF_Tc` \ zonked_expr -> + zonkTcType ty `thenNF_Tc` \ zonked_ty -> + returnTc (new_pcs, zonked_expr, zonked_ty) + where + get_fixity :: Name -> Maybe Fixity + get_fixity n = pprPanic "typecheckExpr" (ppr n) + +--------------- +typecheck :: DynFlags + -> PersistentCompilerState + -> HomeSymbolTable + -> PrintUnqualified -- For error printing + -> TcM r + -> IO (Maybe r) + +typecheck dflags pcs hst unqual thing_inside + = do { showPass dflags "Typechecker"; + ; env <- initTcEnv hst (pcs_PTE pcs) + + ; (maybe_tc_result, (warns,errs)) <- initTc dflags env thing_inside + + ; printErrorsAndWarnings unqual (errs,warns) + + ; if isEmptyBag errs then + return maybe_tc_result + else + return Nothing + } \end{code} The internal monster: \begin{code} -tcModule :: RnNameSupply -- for renaming derivings - -> Fixities -- needed for Show/Read derivings. - -> RenamedHsModule -- input - -> TcM s TcResults -- output - -tcModule rn_name_supply fixities - (HsModule mod_name verion exports imports decls _ src_loc) - = tcAddSrcLoc src_loc $ -- record where we're starting - - fixTc (\ ~(unf_env ,_) -> - -- unf_env is used for type-checking interface pragmas - -- 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 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, _, _, _) -> +tcModule :: PersistentCompilerState + -> HomeSymbolTable + -> (Name -> Maybe Fixity) + -> Module + -> [RenamedHsDecl] + -> TcM (PersistentCompilerState, TcResults) + +tcModule pcs hst get_fixity this_mod decls + = -- Type-check the type and class decls, and all imported decls + tcImports pcs hst get_fixity this_mod decls `thenTc` \ (env, new_pcs, local_inst_info, deriv_binds, local_rules) -> + + tcSetEnv env $ + + -- Foreign import declarations next +-- traceTc (text "Tc4") `thenNF_Tc_` + tcForeignImports decls `thenTc` \ (fo_ids, foi_decls) -> + tcExtendGlobalValEnv fo_ids $ - -- Type-check the type and class decls - tcTyAndClassDecls unf_env rec_inst_mapper decls `thenTc` \ env -> + -- Default declarations + tcDefaults decls `thenTc` \ defaulting_tys -> + tcSetDefaultTys defaulting_tys $ + + -- Value declarations next. + -- We also typecheck any extra binds that came out of the "deriving" process +-- traceTc (text "Tc5") `thenNF_Tc_` + tcTopBinds (val_binds `ThenBinds` deriv_binds) `thenTc` \ ((val_binds, env), lie_valdecls) -> + tcSetEnv env $ - -- Typecheck the instance decls, includes deriving - tcSetEnv env ( - tcInstDecls1 unf_env decls mod_name fixities rn_name_supply - ) `thenTc` \ (inst_info, deriv_binds) -> + -- Foreign export declarations next +-- traceTc (text "Tc6") `thenNF_Tc_` + tcForeignExports decls `thenTc` \ (lie_fodecls, foe_binds, foe_decls) -> - buildInstanceEnvs inst_info `thenNF_Tc` \ inst_mapper -> + -- Second pass over class and instance declarations, + -- to compile the bindings themselves. + tcInstDecls2 local_inst_info `thenNF_Tc` \ (lie_instdecls, inst_binds) -> + tcClassDecls2 this_mod tycl_decls `thenNF_Tc` \ (lie_clasdecls, cls_dm_binds) -> + tcSourceRules source_rules `thenNF_Tc` \ (lie_rules, more_local_rules) -> - returnTc (inst_mapper, env, inst_info, deriv_binds) + -- 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.) + let + lie_alldecls = lie_valdecls `plusLIE` + lie_instdecls `plusLIE` + lie_clasdecls `plusLIE` + lie_fodecls `plusLIE` + lie_rules + in + tcSimplifyTop lie_alldecls `thenTc` \ const_inst_binds -> - -- End of inner fix loop - ) `thenTc` \ (_, env, inst_info, deriv_binds) -> + -- Backsubstitution. This must be done last. + -- Even tcSimplifyTop may do some unification. + let + all_binds = val_binds `AndMonoBinds` + inst_binds `AndMonoBinds` + cls_dm_binds `AndMonoBinds` + const_inst_binds `AndMonoBinds` + foe_binds + in +-- traceTc (text "Tc9") `thenNF_Tc_` + zonkTopBinds all_binds `thenNF_Tc` \ (all_binds', final_env) -> + tcSetEnv final_env $ + -- zonkTopBinds puts all the top-level Ids into the tcGEnv + zonkForeignExports foe_decls `thenNF_Tc` \ foe_decls' -> + zonkRules more_local_rules `thenNF_Tc` \ more_local_rules' -> - tcSetEnv env ( - - -- Default declarations - tcDefaults decls `thenTc` \ defaulting_tys -> - tcSetDefaultTys defaulting_tys $ - - -- Create any necessary record selector Ids and their bindings - -- "Necessary" includes data and newtype declarations - -- We don't create bindings for dictionary constructors; - -- they are always fully applied, and the bindings are just there - -- to support partial applications - let - tycons = getEnvTyCons env - classes = getEnvClasses env - local_tycons = filter isLocallyDefined tycons - local_classes = filter isLocallyDefined classes - in - 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... 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 $ - - -- Extend the TyCon envt with the tycons corresponding to - -- the classes. - -- They are mentioned in types in interface files. - tcExtendTypeEnv [ (getName tycon, (kindToTcKind (tyConKind tycon), Nothing, ATyCon 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 $ + + let local_things = filter (isLocalThing this_mod) (nameEnvElts (getTcGEnv final_env)) + + -- Create any necessary "implicit" bindings (data constructors etc) + -- Should we create bindings for dictionary constructors? + -- They are always fully applied, and the bindings are just there + -- to support partial applications. But it's easier to let them through. + implicit_binds = andMonoBindList [ CoreMonoBind id (unfoldingTemplate unf) + | id <- implicitTyThingIds local_things + , let unf = idUnfolding id + , hasUnfolding unf + ] + + local_type_env :: TypeEnv + local_type_env = mkTypeEnv local_things + + all_local_rules = local_rules ++ more_local_rules' + in +-- traceTc (text "Tc10") `thenNF_Tc_` + returnTc (new_pcs, + TcResults { tc_env = local_type_env, + tc_binds = implicit_binds `AndMonoBinds` all_binds', + tc_fords = foi_decls ++ foe_decls', + tc_rules = all_local_rules + } + ) + where + tycl_decls = [d | TyClD d <- decls] + val_binds = foldr ThenBinds EmptyBinds [binds | ValD binds <- decls] + source_rules = [d | RuleD d <- decls, not (isIfaceRuleDecl d)] +\end{code} - -- 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 - tcTopBindsAndThen - (\ is_rec binds1 (binds2, thing) -> (binds1 `AndMonoBinds` binds2, thing)) - (get_val_decls decls `ThenBinds` deriv_binds) - ( 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. - tcInstDecls2 inst_info `thenNF_Tc` \ (lie_instdecls, inst_binds) -> - tcClassDecls2 decls `thenNF_Tc` \ (lie_clasdecls, cls_dm_binds) -> - tcRules decls `thenNF_Tc` \ (lie_rules, rules) -> - - - -- 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.) - let - 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 - tcLookupValueMaybe main_NAME `thenNF_Tc` \ maybe_main -> - checkTc (maybeToBool maybe_main) noMainErr - else - returnTc () - ) `thenTc_` - - -- Backsubstitution. This must be done last. - -- Even tcSimplifyTop may do some unification. - let - all_binds = imp_data_binds `AndMonoBinds` - imp_cls_binds `AndMonoBinds` - val_binds `AndMonoBinds` - inst_binds `AndMonoBinds` - cls_dm_binds `AndMonoBinds` - const_inst_binds `AndMonoBinds` - foe_binds - in - 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' -> +\begin{code} +tcImports :: PersistentCompilerState + -> HomeSymbolTable + -> (Name -> Maybe Fixity) + -> Module + -> [RenamedHsDecl] + -> TcM (TcEnv, PersistentCompilerState, + [InstInfo], RenamedHsBinds, [TypecheckedRuleDecl]) + +-- tcImports is a slight mis-nomer. +-- It deals with everythign that could be an import: +-- type and class decls +-- interface signatures +-- instance decls +-- rule decls +-- These can occur in source code too, of course + +tcImports pcs hst get_fixity this_mod decls + = fixTc (\ ~(unf_env, _, _, _, _) -> + -- (unf_env :: RecTcEnv) is used for type-checking interface pragmas + -- which is done lazily [ie failure just drops the pragma + -- without having any global-failure effect]. + -- + -- unf_env is also used to get the pragama info + -- for imported dfuns and default methods + +-- traceTc (text "Tc1") `thenNF_Tc_` + tcTyAndClassDecls unf_env tycl_decls `thenTc` \ env -> + tcSetEnv env $ + + -- Typecheck the instance decls, includes deriving +-- traceTc (text "Tc2") `thenNF_Tc_` + tcInstDecls1 (pcs_insts pcs) (pcs_PRS pcs) + hst unf_env get_fixity this_mod + decls `thenTc` \ (new_pcs_insts, inst_env, local_inst_info, deriv_binds) -> + tcSetInstEnv inst_env $ + + -- 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 +-- traceTc (text "Tc3") `thenNF_Tc_` + tcInterfaceSigs unf_env tycl_decls `thenTc` \ sig_ids -> + tcExtendGlobalValEnv sig_ids $ + + + tcIfaceRules (pcs_rules pcs) this_mod iface_rules `thenNF_Tc` \ (new_pcs_rules, local_rules) -> + tcGetEnv `thenTc` \ unf_env -> let - thin_air_ids = map (explicitLookupValueByKey really_final_env . nameUnique) thinAirIdNames - -- When looking up the thin-air names we must use - -- a global env that includes the zonked locally-defined Ids too - -- Hence using really_final_env + imported_things = filter (not . isLocalThing this_mod) (nameEnvElts (getTcGEnv unf_env)) + + new_pte :: PackageTypeEnv + new_pte = extendTypeEnvList (pcs_PTE pcs) imported_things + + new_pcs :: PersistentCompilerState + new_pcs = pcs { pcs_PTE = new_pte, + pcs_insts = new_pcs_insts, + pcs_rules = new_pcs_rules + } in - returnTc (really_final_env, - (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, - tc_thinair = thin_air_ids - })) - ) - - -- End of outer fix loop - ) `thenTc` \ (final_env, stuff) -> - returnTc stuff - -get_val_decls decls = foldr ThenBinds EmptyBinds [binds | ValD binds <- decls] -\end{code} - + returnTc (unf_env, new_pcs, local_inst_info, deriv_binds, local_rules) + ) + where + tycl_decls = [d | TyClD d <- decls] + iface_rules = [d | RuleD d <- decls, isIfaceRuleDecl d] +\end{code} + +%************************************************************************ +%* * +\subsection{Dumping output} +%* * +%************************************************************************ \begin{code} -noMainErr - = hsep [ptext SLIT("Module"), quotes (pprModuleName mAIN_Name), - ptext SLIT("must include a definition for"), quotes (ppr main_NAME)] -\end{code} +printTcDump dflags Nothing = return () +printTcDump dflags (Just (_, results)) + = do dumpIfSet_dyn dflags Opt_D_dump_types + "Type signatures" (dump_sigs results) + dumpIfSet_dyn dflags Opt_D_dump_tc + "Typechecked" (dump_tc results) + +dump_tc results + = vcat [ppr (tc_binds results), + pp_rules (tc_rules results), + ppr_gen_tycons [tc | ATyCon tc <- nameEnvElts (tc_env 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)) + | AnId 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 = True -- For now + +ppr_gen_tycons tcs = vcat [ptext SLIT("{-# Generic type constructor details"), + vcat (map ppr_gen_tycon tcs), + ptext SLIT("#-}") + ] + +-- x&y are now Id's, not CoreExpr's +ppr_gen_tycon tycon + | Just ep <- tyConGenInfo tycon + = (ppr tycon <> colon) $$ nest 4 (ppr_ep ep) + + | otherwise = ppr tycon <> colon <+> ptext SLIT("Not derivable") + +ppr_ep (EP from to) + = vcat [ ptext SLIT("Rep type:") <+> ppr (funResultTy from_tau), + ptext SLIT("From:") <+> ppr (unfoldingTemplate (idUnfolding from)), + ptext SLIT("To:") <+> ppr (unfoldingTemplate (idUnfolding to)) + ] + where + (_,from_tau) = splitForAllTys (idType from) +pp_rules [] = empty +pp_rules rs = vcat [ptext SLIT("{-# RULES"), + nest 4 (vcat (map ppr rs)), + ptext SLIT("#-}")] +\end{code}