%
-% (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}
-#include "HsVersions.h"
-
module TcModule (
typecheckModule,
- SYN_IE(TcResults),
- SYN_IE(TcSpecialiseRequests),
- SYN_IE(TcDDumpDeriv)
+ TcResults
) where
-IMP_Ubiq(){-uitous-}
+#include "HsVersions.h"
-import CmdLineOpts ( opt_D_dump_tc, opt_D_dump_deriv )
-import HsSyn ( HsDecl(..), HsModule(..), HsBinds(..), HsExpr, MonoBinds(..),
- TyDecl, SpecDataSig, ClassDecl, InstDecl, IfaceSig,
- SpecInstSig, DefaultDecl, Sig, Fake, InPat,
- SYN_IE(RecFlag), nonRecursive, GRHSsAndBinds, Match,
- FixityDecl, IE, ImportDecl, OutPat
+import CmdLineOpts ( opt_D_dump_tc )
+import HsSyn ( HsModule(..), HsBinds(..), MonoBinds(..), HsDecl(..) )
+import RnHsSyn ( RenamedHsModule )
+import TcHsSyn ( TcMonoBinds, TypecheckedMonoBinds, zonkTopBinds,
+ TypecheckedForeignDecl, zonkForeignExports
)
-import RnHsSyn ( SYN_IE(RenamedHsModule), RenamedFixityDecl(..) )
-import TcHsSyn ( SYN_IE(TypecheckedHsBinds), SYN_IE(TypecheckedHsExpr),
- SYN_IE(TypecheckedDictBinds), SYN_IE(TcMonoBinds),
- SYN_IE(TypecheckedMonoBinds),
- zonkTopBinds )
import TcMonad
import Inst ( Inst, emptyLIE, plusLIE )
-import TcBinds ( tcBindsAndThen )
+import TcBinds ( tcTopBindsAndThen )
import TcClassDcl ( tcClassDecls2 )
import TcDefaults ( tcDefaults )
-import TcEnv ( tcExtendGlobalValEnv, getEnv_LocalIds,
- getEnv_TyCons, getEnv_Classes, tcLookupLocalValue,
- tcLookupLocalValueByKey, tcLookupTyCon,
- tcLookupGlobalValueByKeyMaybe )
-import SpecEnv ( SpecEnv )
+import TcEnv ( tcExtendGlobalValEnv, tcExtendTypeEnv,
+ getEnvTyCons, getEnvClasses, tcLookupValueMaybe,
+ explicitLookupValueByKey, tcSetValueEnv,
+ tcLookupTyCon, initEnv,
+ ValueEnv, TcTyThing(..)
+ )
import TcExpr ( tcId )
+import TcForeign ( tcForeignImports, tcForeignExports )
import TcIfaceSig ( tcInterfaceSigs )
import TcInstDcls ( tcInstDecls1, tcInstDecls2 )
-import TcInstUtil ( buildInstanceEnvs, InstInfo )
+import TcInstUtil ( buildInstanceEnvs, classDataCon, InstInfo )
import TcSimplify ( tcSimplifyTop )
-import TcTyClsDecls ( tcTyAndClassDecls1 )
+import TcTyClsDecls ( tcTyAndClassDecls )
import TcTyDecls ( mkDataBinds )
-import TcType ( TcIdOcc(..), SYN_IE(TcType), tcInstType )
-import TcKind ( TcKind )
+import TcType ( TcType, typeToTcType,
+ TcKind, kindToTcKind,
+ newTyVarTy
+ )
-import RnMonad ( RnNameSupply(..) )
-import Bag ( listToBag )
-import ErrUtils ( SYN_IE(Warning), SYN_IE(Error),
- pprBagOfErrors, dumpIfSet, ghcExit
+import RnMonad ( RnNameSupply )
+import Bag ( isEmptyBag )
+import ErrUtils ( Message,
+ pprBagOfErrors, dumpIfSet
)
-import Id ( idType, GenId, SYN_IE(IdEnv), nullIdEnv )
-import Maybes ( catMaybes, MaybeErr(..) )
-import Name ( Name, isLocallyDefined, pprModule )
-import Pretty
-import TyCon ( TyCon, isSynTyCon )
-import Class ( GenClass, SYN_IE(Class), classSelIds )
-import Type ( applyTyCon, mkSynTy, SYN_IE(Type) )
-import PprType ( GenType, GenTyVar )
+import Id ( Id, idType )
+import Name ( Name, nameUnique, isLocallyDefined, pprModule, NamedThing(..) )
+import TyCon ( TyCon, tyConKind )
+import DataCon ( dataConId )
+import Class ( Class, classSelIds, classTyCon )
+import Type ( mkTyConApp, mkForAllTy, mkTyVarTy,
+ boxedTypeKind, getTyVar, Type )
import TysWiredIn ( unitTy )
-import PrelMods ( gHC_MAIN, mAIN )
-import PrelInfo ( main_NAME, mainPrimIO_NAME, ioTyCon_NAME, primIoTyCon_NAME )
-import TyVar ( GenTyVar, SYN_IE(TyVarEnv), nullTyVarEnv )
-import Unify ( unifyTauTy )
-import UniqFM ( lookupUFM_Directly, lookupWithDefaultUFM_Directly,
- filterUFM, eltsUFM )
+import PrelMods ( mAIN )
+import PrelInfo ( main_NAME, ioTyCon_NAME,
+ thinAirIdNames, setThinAirIds
+ )
+import TcUnify ( unifyTauTy )
import Unique ( Unique )
import UniqSupply ( UniqSupply )
import Util
import Bag ( Bag, isEmptyBag )
+import Outputable
-import FiniteMap ( emptyFM, FiniteMap )
-
-import Outputable ( Outputable(..), PprStyle, printErrs, pprDumpStyle, pprErrorsStyle )
-
-tycon_specs = emptyFM
+import IOExts
\end{code}
Outside-world interface:
\begin{code}
---ToDo: put this in HsVersions
-#if __GLASGOW_HASKELL__ >= 200
-# define REAL_WORLD RealWorld
-#else
-# define REAL_WORLD _RealWorld
-#endif
-
-- Convenient type synonyms first:
type TcResults
= (TypecheckedMonoBinds,
[TyCon], [Class],
Bag InstInfo, -- Instance declaration information
- TcSpecialiseRequests,
- TcDDumpDeriv)
-
-type TcSpecialiseRequests
- = FiniteMap TyCon [(Bool, [Maybe Type])]
- -- source tycon specialisation requests
-
-type TcDDumpDeriv
- = PprStyle -> Doc
+ [TypecheckedForeignDecl], -- foreign import & exports.
+ ValueEnv,
+ [Id] -- The thin-air Ids
+ )
---------------
typecheckModule
-> IO (Maybe TcResults)
typecheckModule us rn_name_supply mod
- = case initTc us (tcModule rn_name_supply mod) of
- Failed (errs, warns) ->
- print_errs warns >>
- print_errs errs >>
- return Nothing
-
- Succeeded (results@(binds, _, _, _, _, dump_deriv), warns) ->
- print_errs warns >>
-
- dumpIfSet opt_D_dump_tc "Typechecked"
- (ppr pprDumpStyle binds) >>
-
- dumpIfSet opt_D_dump_deriv "Derived instances"
- (dump_deriv pprDumpStyle) >>
-
- return (Just results)
+ = initTc us initEnv (tcModule rn_name_supply mod) >>= \ (maybe_result, warns, errs) ->
+
+ print_errs warns >>
+ print_errs errs >>
+
+ -- write the thin-air Id map
+ (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") >>
+
+ return (if isEmptyBag errs then
+ maybe_result
+ else
+ Nothing)
print_errs errs
| isEmptyBag errs = return ()
- | otherwise = printErrs (pprBagOfErrors pprErrorsStyle errs)
+ | otherwise = printErrs (pprBagOfErrors errs)
\end{code}
The internal monster:
-> TcM s TcResults -- output
tcModule rn_name_supply
- (HsModule mod_name verion exports imports fixities decls src_loc)
+ (HsModule mod_name verion exports imports decls src_loc)
= tcAddSrcLoc src_loc $ -- record where we're starting
fixTc (\ ~(unf_env ,_) ->
-- 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, _, _, _, _) ->
+ 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 rec_inst_mapper 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) ->
+ ) `thenTc` \ (inst_info, deriv_binds) ->
- -- trace "tc4" $
- buildInstanceEnvs inst_info `thenTc` \ inst_mapper ->
+ buildInstanceEnvs inst_info `thenNF_Tc` \ inst_mapper ->
- returnTc (inst_mapper, env, inst_info, deriv_binds, ddump_deriv)
+ returnTc (inst_mapper, env, inst_info, deriv_binds)
-- End of inner fix loop
- ) `thenTc` \ (_, env, inst_info, deriv_binds, ddump_deriv) ->
+ ) `thenTc` \ (_, env, inst_info, deriv_binds) ->
- -- trace "tc5" $
- tcSetEnv env $
+ tcSetEnv env (
-- Default declarations
tcDefaults decls `thenTc` \ 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 = getEnv_TyCons env
- classes = getEnv_Classes env
+ tycons = getEnvTyCons env
+ classes = getEnvClasses env
+ local_tycons = filter isLocallyDefined tycons
+ local_classes = filter isLocallyDefined classes
in
mkDataBinds tycons `thenTc` \ (data_ids, data_binds) ->
-- (a) constructors
-- (b) record selectors
-- (c) class op selectors
- -- (d) default-method 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 (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
tcInterfaceSigs unf_env decls `thenTc` \ sig_ids ->
tcExtendGlobalValEnv sig_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:" $
- tcBindsAndThen
+ 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) ->
-
-
-- Check that "main" has the right signature
tcCheckMainSig mod_name `thenTc_`
-- 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
in
tcSimplifyTop lie_alldecls `thenTc` \ const_inst_binds ->
val_binds `AndMonoBinds`
inst_binds `AndMonoBinds`
cls_binds `AndMonoBinds`
- const_inst_binds
+ 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' ->
- returnTc (really_final_env, (all_binds', inst_info, ddump_deriv))
+ 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))
+ )
-- End of outer fix loop
- ) `thenTc` \ (final_env, (all_binds', inst_info, ddump_deriv)) ->
-
-
- let
- tycons = getEnv_TyCons final_env
- classes = getEnv_Classes final_env
-
- local_tycons = filter isLocallyDefined tycons
- local_classes = filter isLocallyDefined classes
- in
- -- FINISHED AT LAST
- returnTc (
- all_binds',
-
- local_tycons, local_classes, inst_info, tycon_specs,
-
- ddump_deriv
- )
+ ) `thenTc` \ (final_env, stuff) ->
+ returnTc stuff
get_val_decls decls = foldr ThenBinds EmptyBinds [binds | ValD binds <- decls]
\end{code}
\begin{code}
tcCheckMainSig mod_name
- | not is_main && not is_ghc_main
+ | mod_name /= mAIN
= returnTc () -- A non-main module
| otherwise
= -- Check that main is defined
- tcLookupTyCon tycon_name `thenTc` \ (_,_,tycon) ->
- tcLookupLocalValue main_name `thenNF_Tc` \ maybe_main_id ->
+ tcLookupTyCon ioTyCon_NAME `thenTc` \ ioTyCon ->
+ tcLookupValueMaybe main_NAME `thenNF_Tc` \ maybe_main_id ->
case maybe_main_id of {
- Nothing -> failTc (noMainErr mod_name main_name);
+ Nothing -> failWithTc noMainErr ;
Just main_id ->
-- Check that it has the right type (or a more general one)
- let
- expected_ty | isSynTyCon tycon = mkSynTy tycon [unitTy]
- | otherwise = applyTyCon tycon [unitTy]
- -- This is bizarre. There ought to be a suitable function in Type.lhs!
+ -- As of Haskell 98, anything that unifies with (IO a) is OK.
+ newTyVarTy boxedTypeKind `thenNF_Tc` \ t_tv ->
+ let
+ tv = getTyVar "tcCheckMainSig" t_tv
+ expected_tau = typeToTcType ((mkTyConApp ioTyCon [t_tv]))
in
- tcInstType [] expected_ty `thenNF_Tc` \ expected_tau ->
- tcId main_name `thenNF_Tc` \ (_, lie, main_tau) ->
- tcSetErrCtxt (mainTyCheckCtxt main_name) $
+ tcId main_NAME `thenNF_Tc` \ (_, lie, main_tau) ->
+ tcSetErrCtxt mainTyCheckCtxt $
unifyTauTy expected_tau
- main_tau `thenTc_`
- checkTc (isEmptyBag lie) (mainTyMisMatch main_name expected_ty (idType main_id))
+ main_tau `thenTc_`
+ checkTc (isEmptyBag lie) (mainTyMisMatch expected_tau (idType main_id))
}
- where
- is_main = mod_name == mAIN
- is_ghc_main = mod_name == gHC_MAIN
-
- main_name | is_main = main_NAME
- | otherwise = mainPrimIO_NAME
- tycon_name | is_main = ioTyCon_NAME
- | otherwise = primIoTyCon_NAME
-mainTyCheckCtxt main_name sty
- = hsep [ptext SLIT("When checking that"), ppr sty main_name, ptext SLIT("has the required type")]
+mainTyCheckCtxt
+ = hsep [ptext SLIT("When checking that"), ppr main_NAME, ptext SLIT("has the required type")]
-noMainErr mod_name main_name sty
- = hsep [ptext SLIT("Module"), pprModule sty mod_name,
- ptext SLIT("must include a definition for"), ppr sty main_name]
+noMainErr
+ = hsep [ptext SLIT("Module"), quotes (pprModule mAIN),
+ ptext SLIT("must include a definition for"), quotes (ppr main_NAME)]
-mainTyMisMatch :: Name -> Type -> TcType s -> Error
-mainTyMisMatch main_name expected actual sty
- = hang (hsep [ppr sty main_name, ptext SLIT("has the wrong type")])
+mainTyMisMatch :: TcType -> TcType -> Message
+mainTyMisMatch expected actual
+ = hang (hsep [ppr main_NAME, ptext SLIT("has the wrong type")])
4 (vcat [
- hsep [ptext SLIT("Expected:"), ppr sty expected],
- hsep [ptext SLIT("Inferred:"), ppr sty actual]
+ hsep [ptext SLIT("Expected:"), ppr expected],
+ hsep [ptext SLIT("Inferred:"), ppr actual]
])
\end{code}
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