import HsSyn ( HsModule(..), HsBinds(..), MonoBinds(..), HsDecl(..) )
import HsTypes ( toHsType )
import RnHsSyn ( RenamedHsModule )
-import TcHsSyn ( TcMonoBinds, TypecheckedMonoBinds,
+import TcHsSyn ( TypecheckedMonoBinds,
TypecheckedForeignDecl, TypecheckedRuleDecl,
zonkTopBinds, zonkForeignExports, zonkRules
)
import TcMonad
-import Inst ( Inst, emptyLIE, plusLIE )
-import TcBinds ( tcTopBindsAndThen )
+import Inst ( emptyLIE, plusLIE )
+import TcBinds ( tcTopBinds )
import TcClassDcl ( tcClassDecls2, mkImplicitClassBinds )
import TcDefaults ( tcDefaults )
-import TcEnv ( tcExtendGlobalValEnv, tcExtendTypeEnv,
- getEnvTyCons, getEnvClasses, tcLookupValueByKeyMaybe,
- explicitLookupValueByKey, tcSetValueEnv, tcSetInstEnv,
- initEnv,
- ValueEnv, TcTyThing(..)
+import TcEnv ( tcExtendGlobalValEnv, tcLookupGlobal_maybe,
+ tcEnvTyCons, tcEnvClasses,
+ tcSetEnv, tcSetInstEnv, initEnv
)
-import TcExpr ( tcId )
import TcRules ( tcRules )
import TcForeign ( tcForeignImports, tcForeignExports )
import TcIfaceSig ( tcInterfaceSigs )
import TcInstDcls ( tcInstDecls1, tcInstDecls2 )
-import TcInstUtil ( buildInstanceEnv, InstInfo )
+import TcInstUtil ( InstInfo )
import TcSimplify ( tcSimplifyTop )
import TcTyClsDecls ( tcTyAndClassDecls )
import TcTyDecls ( mkImplicitDataBinds )
-import TcType ( TcType, typeToTcType,
- TcKind, kindToTcKind,
- newTyVarTy
- )
+import CoreUnfold ( unfoldingTemplate )
+import Type ( funResultTy, splitForAllTys )
import RnMonad ( RnNameSupply, FixityEnv )
import Bag ( isEmptyBag )
-import ErrUtils ( Message, printErrorsAndWarnings, dumpIfSet )
-import Id ( Id, idType, idName )
-import Module ( pprModuleName )
-import OccName ( isSysOcc )
-import Name ( Name, nameUnique, nameOccName, isLocallyDefined,
- toRdrName, nameEnvElts, NamedThing(..)
+import ErrUtils ( printErrorsAndWarnings, dumpIfSet )
+import Id ( idType, idName, idUnfolding )
+import Module ( pprModuleName, mkThisModule, plusModuleEnv )
+import Name ( nameOccName, isLocallyDefined, isGlobalName,
+ toRdrName, nameEnvElts,
)
-import TyCon ( TyCon, tyConKind )
-import Class ( Class, classSelIds, classTyCon )
-import Type ( mkTyConApp, mkForAllTy,
- boxedTypeKind, getTyVar, Type )
-import TysWiredIn ( unitTy )
-import PrelInfo ( mAIN_Name )
-import TcUnify ( unifyTauTy )
-import Unique ( Unique, mainKey )
+import TyCon ( TyCon, isDataTyCon, tyConName, tyConGenInfo )
+import OccName ( isSysOcc )
+import TyCon ( TyCon, isClassTyCon )
+import Class ( Class )
+import PrelNames ( mAIN_Name, mainKey )
import UniqSupply ( UniqSupply )
import Maybes ( maybeToBool )
import Util
+import BasicTypes ( EP(..) )
import Bag ( Bag, isEmptyBag )
-import Outputable
+vimport Outputable
-import IOExts
\end{code}
Outside-world interface:
-- Convenient type synonyms first:
data TcResults
= TcResults {
+ tc_pcs :: PersistentCompilerState, -- Augmented with imported information,
+ -- (but not stuff from this module)
+ tc_env :: TypeEnv, -- The TypeEnv just for the stuff from this module
+ tc_insts :: [DFunId], -- Instances, just for this module
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
+ :: PersistentCompilerState
+ -> HomeSymbolTable
-> RenamedHsModule
- -> IO (Maybe TcResults)
+ -> IO (Maybe (PersistentCompilerState, TcResults))
+
+typecheckModule pcs hst (HsModule mod_name _ _ _ decls _ src_loc)
+ = do { env <- initTcEnv global_symbol_table global_inst_env ;
-typecheckModule us rn_name_supply fixity_env mod
- = initTc us initEnv (tcModule rn_name_supply fixity_env mod) >>= \ (maybe_result, warns, errs) ->
+ (_, (maybe_result, msgs)) <- initTc env src_loc tc_module
- printErrorsAndWarnings errs warns >>
+ printErrorsAndWarnings msgs ;
- (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)
- ) >>
+ printTcDumps maybe_result ;
- return (if isEmptyBag errs then
- maybe_result
- else
- Nothing)
+ if isEmptyBag errs then
+ return Nothing
+ else
+ return result
+ }
+ where
+ this_mod = mkThisModule
+ global_symbol_table = pcs_PST pcs `plusModuleEnv` hst
+
+ tc_module = fixTc (\ ~(unf_env ,_) -> tcModule pcs hst this_mod decls unf_env)
+\end{code}
+
+The internal monster:
+\begin{code}
+tcModule :: PersistentCompilerState
+ -> HomeSymbolTable
+ -> Module
+ -> [RenamedHsDecl]
+ -> TcEnv -- The knot-tied environment
+ -> TcM TcResults
+
+ -- (unf_env :: TcEnv) 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
+
+tcModule pcs hst this_mod decls unf_env
+ = -- Type-check the type and class decls
+ tcTyAndClassDecls unf_env decls `thenTc` \ env ->
+ tcSetEnv env $
+ let
+ classes = tcEnvClasses env
+ tycons = tcEnvTyCons env -- INCLUDES tycons derived from classes
+ local_classes = filter isLocallyDefined classes
+ local_tycons = [ tc | tc <- tycons,
+ isLocallyDefined tc,
+ not (isClassTyCon tc)
+ ]
+ -- For local_tycons, filter out the ones derived from classes
+ -- Otherwise the latter show up in interface files
+ in
+
+ -- Typecheck the instance decls, includes deriving
+ tcInstDecls1 pcs hst unf_env this_mod
+ local_tycons decls `thenTc` \ (pcs_with_insts, inst_env, inst_info, deriv_binds) ->
+ tcSetInstEnv inst_env $
+
+ -- 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
+ -- 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... 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
+ tcTopBinds (get_binds decls `ThenBinds` deriv_binds) `thenTc` \ ((val_binds, env), lie_valdecls) ->
+ tcSetEnv 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
+ checkMain this_mod `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', final_env) ->
+ tcSetEnv final_env $
+ -- zonkTopBinds puts all the top-level Ids into the tcGEnv
+ zonkForeignExports foe_decls `thenNF_Tc` \ foe_decls' ->
+ zonkRules rules `thenNF_Tc` \ rules' ->
+
+
+ let groups :: FiniteMap Module TypeEnv
+ groups = groupTyThings (nameEnvElts (tcGEnv final_env))
+
+ local_type_env :: TypeEnv
+ local_type_env = lookupWithDefaultFM groups this_mod emptyNameEnv
+
+ new_pst :: PackageSymbolTable
+ new_pst = extendTypeEnv (pcs_PST pcs) (delFromFM groups this_mod)
+
+ final_pcs :: PersistentCompilerState
+ final_pcs = pcs_with_insts {pcs_PST = new_pst}
+ in
+ returnTc (really_final_env,
+ TcResults { tc_pcs = final_pcs,
+ tc_env = local_type_env,
+ tc_binds = all_binds',
+ tc_insts = map instInfoDfunId inst_infos,
+ tc_fords = foi_decls ++ foe_decls',
+ tc_rules = rules'
+ }))
+
+get_binds decls = foldr ThenBinds EmptyBinds [binds | ValD binds <- decls]
+\end{code}
+
+
+\begin{code}
+checkMain :: Module -> TcM ()
+checkMain this_mod
+ | moduleName this_mod == mAIN_Name
+ = tcLookupGlobal_maybe mainName `thenNF_Tc` \ maybe_main ->
+ case maybe_main of
+ Just (AnId _) -> returnTc ()
+ other -> addErrTc noMainErr
+
+ | otherwise = returnTc ()
+
+noMainErr
+ = hsep [ptext SLIT("Module"), quotes (pprModuleName mAIN_Name),
+ ptext SLIT("must include a definition for"), quotes (ptext SLIT("main"))]
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Dumping output}
+%* *
+%************************************************************************
+
+\begin{code}
+printTcDump Nothing = return ()
+printTcDump (Just results)
+ = do { dumpIfSet opt_D_dump_types "Type signatures" (dump_sigs results) ;
+ dumpIfSet opt_D_dump_tc "Typechecked" (dump_tc results)
+ }
dump_tc results
- = ppr (tc_binds results) $$ pp_rules (tc_rules results)
+ = vcat [ppr (tc_binds results),
+ pp_rules (tc_rules results),
+ ppr_gen_tycons (tc_tycons results)
+ ]
dump_sigs results -- Print type signatures
= -- Convert to HsType so that we get source-language style printing
ppr_sig (n,t) = ppr n <+> dcolon <+> ppr t
want_sig id | opt_PprStyle_Debug = True
- | otherwise = isLocallyDefined n && not (isSysOcc (nameOccName n))
+ | otherwise = isLocallyDefined n &&
+ isGlobalName n &&
+ not (isSysOcc (nameOccName n))
where
n = idName id
-pp_rules [] = empty
-pp_rules rs = vcat [ptext SLIT("{-# RULES"),
- nest 4 (vcat (map ppr rs)),
- ptext SLIT("#-}")]
-\end{code}
+ppr_gen_tycons tcs = vcat [ptext SLIT("{-# Generic type constructor details"),
+ vcat (map ppr_gen_tycon (filter isLocallyDefined tcs)),
+ ptext SLIT("#-}")
+ ]
-The internal monster:
-\begin{code}
-tcModule :: RnNameSupply -- for renaming derivings
- -> FixityEnv -- needed for Show/Read derivings.
- -> RenamedHsModule -- input
- -> TcM s TcResults -- output
-
-tcModule rn_name_supply fixities
- (HsModule mod_name _ _ _ decls _ src_loc)
- = tcAddSrcLoc src_loc $ -- record where we're starting
-
- fixTc (\ ~(unf_env ,_) ->
- -- unf_env is used for type-checking interface pragmas
- -- which is done lazily [ie failure just drops the pragma
- -- without having any global-failure effect].
- --
- -- unf_env is also used to get the pragam info
- -- for imported dfuns and default methods
-
- -- Type-check the type and class decls
- tcTyAndClassDecls unf_env decls `thenTc` \ env ->
-
- -- Typecheck the instance decls, includes deriving
- tcSetEnv env $
+-- x&y are now Id's, not CoreExpr's
+ppr_gen_tycon tycon
+ | Just ep <- tyConGenInfo tycon
+ = (ppr tycon <> colon) $$ nest 4 (ppr_ep ep)
- tcInstDecls1 unf_env decls
- mod_name fixities
- rn_name_supply `thenTc` \ (inst_info, deriv_binds) ->
-
- buildInstanceEnv inst_info `thenNF_Tc` \ inst_env ->
-
- tcSetInstEnv inst_env $
- let
- tycons = getEnvTyCons env
- classes = getEnvClasses env
- local_tycons = filter isLocallyDefined tycons
- local_classes = filter isLocallyDefined classes
- in
-
- -- Default declarations
- tcDefaults decls `thenTc` \ defaulting_tys ->
- tcSetDefaultTys defaulting_tys $
-
- -- 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), ADataTyCon 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
- -- 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
- -- 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... 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
- 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
- tcLookupValueByKeyMaybe mainKey `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' ->
-
- 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
- }))
-
- -- End of outer fix loop
- ) `thenTc` \ (final_env, stuff) ->
- returnTc stuff
-
-get_val_decls decls = foldr ThenBinds EmptyBinds [binds | ValD binds <- decls]
-\end{code}
+ | 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)
-\begin{code}
-noMainErr
- = hsep [ptext SLIT("Module"), quotes (pprModuleName mAIN_Name),
- ptext SLIT("must include a definition for"), quotes (ptext SLIT("main"))]
+pp_rules [] = empty
+pp_rules rs = vcat [ptext SLIT("{-# RULES"),
+ nest 4 (vcat (map ppr rs)),
+ ptext SLIT("#-}")]
\end{code}
-
projects / ghc-hetmet.git / blobdiff