\begin{code}
module TcModule (
typecheckModule,
- TcResults
+ TcResults(..)
) where
#include "HsVersions.h"
-import CmdLineOpts ( opt_D_dump_tc )
+import CmdLineOpts ( opt_D_dump_tc, opt_D_dump_types, opt_PprStyle_Debug )
import HsSyn ( HsModule(..), HsBinds(..), MonoBinds(..), HsDecl(..) )
+import HsTypes ( toHsType )
import RnHsSyn ( RenamedHsModule )
-import TcHsSyn ( TcMonoBinds, TypecheckedMonoBinds, zonkTopBinds,
- TypecheckedForeignDecl, zonkForeignExports
+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 ( tcExtendGlobalValEnv, tcExtendTypeEnv,
- getEnvTyCons, getEnvClasses, tcLookupValueMaybe,
- explicitLookupValueByKey, tcSetValueEnv,
- tcLookupTyCon, initEnv,
- ValueEnv, TcTyThing(..)
+ getEnvTyCons, getEnvClasses, tcLookupValueByKeyMaybe,
+ tcSetValueEnv, tcSetInstEnv,
+ initEnv,
+ ValueEnv,
)
-import TcExpr ( tcId )
+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 ( tcTyAndClassDecls )
-import TcTyDecls ( mkDataBinds )
-import TcType ( TcType, typeToTcType,
- TcKind, kindToTcKind
- )
+import TcTyDecls ( mkImplicitDataBinds )
+import TcType ( TcType, TcKind )
-import RnMonad ( RnNameSupply )
+import RnMonad ( RnNameSupply, FixityEnv )
import Bag ( isEmptyBag )
-import ErrUtils ( ErrMsg,
- pprBagOfErrors, dumpIfSet
+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 ( Id, idType )
-import Name ( Name, nameUnique, isLocallyDefined, pprModule, NamedThing(..) )
-import TyCon ( TyCon, tyConKind )
-import DataCon ( dataConId )
+import TyCon ( TyCon, tyConKind, tyConClass_maybe )
import Class ( Class, classSelIds, classTyCon )
-import Type ( mkTyConApp, Type )
-import TysWiredIn ( unitTy )
-import PrelMods ( mAIN )
-import PrelInfo ( main_NAME, ioTyCon_NAME,
- thinAirIdNames, setThinAirIds
- )
-import TcUnify ( unifyTauTy )
-import Unique ( Unique )
+import PrelInfo ( mAIN_Name )
+import Unique ( Unique, mainKey )
import UniqSupply ( UniqSupply )
+import Maybes ( maybeToBool )
import Util
import Bag ( Bag, isEmptyBag )
import Outputable
-
-import IOExts
\end{code}
Outside-world interface:
\begin{code}
-- Convenient type synonyms first:
-type TcResults
- = (TypecheckedMonoBinds,
- [TyCon], [Class],
- Bag InstInfo, -- Instance declaration information
- [TypecheckedForeignDecl], -- foreign import & exports.
- ValueEnv,
- [Id] -- The thin-air Ids
- )
+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
- = initTc us initEnv (tcModule rn_name_supply mod) >>= \ (maybe_result, warns, errs) ->
+typecheckModule us rn_name_supply fixity_env mod
+ = initTc us initEnv (tcModule rn_name_supply fixity_env mod) >>= \ (maybe_result, warns, errs) ->
- print_errs warns >>
- print_errs errs >>
-
- -- write the thin-air Id map
+ printErrorsAndWarnings errs warns >>
+
(case maybe_result of
- Just (_, _, _, _, _, _, thin_air_ids) -> setThinAirIds thin_air_ids
- Nothing -> return ()
- ) >>
-
- dumpIfSet opt_D_dump_tc "Typechecked"
- (case maybe_result of
- Just (binds, _, _, _, _, _, _) -> ppr binds
- Nothing -> text "Typecheck failed") >>
-
+ 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 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 ,_) ->
-- 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
- tcTyAndClassDecls unf_env rec_inst_mapper decls `thenTc` \ env ->
-
- -- Typecheck the instance decls, includes deriving
- tcSetEnv env (
- tcInstDecls1 unf_env decls mod_name rn_name_supply
- ) `thenTc` \ (inst_info, deriv_binds) ->
+ tcTyAndClassDecls unf_env decls `thenTc` \ env ->
- buildInstanceEnvs inst_info `thenNF_Tc` \ inst_mapper ->
-
- returnTc (inst_mapper, env, inst_info, deriv_binds)
-
- -- End of inner fix loop
- ) `thenTc` \ (_, env, inst_info, deriv_binds) ->
+ -- Typecheck the instance decls, includes deriving
+ tcSetEnv env $
+
+ tcInstDecls1 unf_env decls
+ (mkThisModule mod_name)
+ fixities rn_name_supply `thenTc` \ (inst_info, deriv_binds) ->
- 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
-- 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
- mkDataBinds tycons `thenTc` \ (data_ids, data_binds) ->
+ 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
-- (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 (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 (dataConId . classDataCon) classes) $
- 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 $
+ tcExtendGlobalValEnv data_ids $
+ tcExtendGlobalValEnv cls_ids $
-- foreign import declarations next.
tcForeignImports decls `thenTc` \ (fo_ids, foi_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_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
lie_alldecls = lie_valdecls `plusLIE`
lie_instdecls `plusLIE`
lie_clasdecls `plusLIE`
- lie_fodecls
+ 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`
+ 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' ->
+ zonkForeignExports foe_decls `thenNF_Tc` \ foe_decls' ->
+ zonkRules rules `thenNF_Tc` \ rules' ->
- 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
- in
returnTc (really_final_env,
- (all_binds', local_tycons, local_classes, inst_info,
- foi_decls ++ foe_decls',
- really_final_env,
- thin_air_ids))
- )
+ (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) ->
\begin{code}
-tcCheckMainSig mod_name
- | mod_name /= mAIN
- = returnTc () -- A non-main module
-
- | otherwise
- = -- Check that main is defined
- tcLookupTyCon ioTyCon_NAME `thenTc` \ ioTyCon ->
- tcLookupValueMaybe 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_tau = typeToTcType (mkTyConApp ioTyCon [unitTy])
- in
- tcId main_NAME `thenNF_Tc` \ (_, lie, main_tau) ->
- tcSetErrCtxt mainTyCheckCtxt $
- unifyTauTy expected_tau
- main_tau `thenTc_`
- checkTc (isEmptyBag lie) (mainTyMisMatch expected_tau (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 :: TcType -> TcType -> 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}
+
projects / ghc-hetmet.git / blobdiff