\begin{code}
module TcModule (
- typecheckModule,
- TcResults(..)
+ typecheckModule, typecheckExpr, TcResults(..)
) where
#include "HsVersions.h"
import CmdLineOpts ( DynFlag(..), DynFlags, opt_PprStyle_Debug )
-import HsSyn ( HsBinds(..), MonoBinds(..), HsDecl(..) )
+import HsSyn ( HsBinds(..), MonoBinds(..), HsDecl(..),
+ isIfaceRuleDecl, nullBinds, andMonoBindList
+ )
import HsTypes ( toHsType )
-import RnHsSyn ( RenamedHsDecl )
-import TcHsSyn ( TypecheckedMonoBinds,
+import RnHsSyn ( RenamedHsBinds, RenamedHsDecl, RenamedHsExpr )
+import TcHsSyn ( TypecheckedMonoBinds, TypecheckedHsExpr,
TypecheckedForeignDecl, TypecheckedRuleDecl,
- zonkTopBinds, zonkForeignExports, zonkRules
+ zonkTopBinds, zonkForeignExports, zonkRules, mkHsLet,
+ zonkExpr
)
+
import TcMonad
+import TcType ( newTyVarTy, zonkTcType )
import Inst ( plusLIE )
import TcBinds ( tcTopBinds )
-import TcClassDcl ( tcClassDecls2, mkImplicitClassBinds )
-import TcDefaults ( tcDefaults )
+import TcClassDcl ( tcClassDecls2 )
+import TcDefaults ( tcDefaults, defaultDefaultTys )
+import TcExpr ( tcMonoExpr )
import TcEnv ( TcEnv, InstInfo(iDFunId), tcExtendGlobalValEnv,
- tcEnvTyCons, tcEnvClasses, isLocalThing,
- tcSetEnv, tcSetInstEnv, initTcEnv, getTcGEnv
+ isLocalThing, tcSetEnv, tcSetInstEnv, initTcEnv, getTcGEnv
)
-import TcRules ( tcRules )
+import TcRules ( tcIfaceRules, tcSourceRules )
import TcForeign ( tcForeignImports, tcForeignExports )
import TcIfaceSig ( tcInterfaceSigs )
import TcInstDcls ( tcInstDecls1, tcInstDecls2 )
import TcSimplify ( tcSimplifyTop )
import TcTyClsDecls ( tcTyAndClassDecls )
-import TcTyDecls ( mkImplicitDataBinds )
-import CoreUnfold ( unfoldingTemplate )
-import Type ( funResultTy, splitForAllTys )
+import CoreUnfold ( unfoldingTemplate, hasUnfolding )
+import Type ( funResultTy, splitForAllTys, openTypeKind )
import Bag ( isEmptyBag )
import ErrUtils ( printErrorsAndWarnings, dumpIfSet_dyn, showPass )
import Id ( idType, idUnfolding )
import HscTypes ( PersistentCompilerState(..), HomeSymbolTable,
PackageTypeEnv, DFunId, ModIface(..),
TypeEnv, extendTypeEnvList,
- TyThing(..), mkTypeEnv )
-import List ( partition )
+ TyThing(..), implicitTyThingIds,
+ mkTypeEnv
+ )
\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)
-
-- All these fields have info *just for this module*
tc_env :: TypeEnv, -- The top level TypeEnv
tc_insts :: [DFunId], -- Instances
---------------
typecheckModule
:: DynFlags
- -> Module
-> PersistentCompilerState
-> HomeSymbolTable
-> ModIface -- Iface for this module
-> PrintUnqualified -- For error printing
-> [RenamedHsDecl]
- -> IO (Maybe TcResults)
+ -> IO (Maybe (PersistentCompilerState, TcResults))
+ -- The new PCS is Augmented with imported information,
+ -- (but not stuff from this module)
-typecheckModule dflags this_mod pcs hst mod_iface unqual decls
- = do { showPass dflags "Typechecker";
+
+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
+
+---------------
+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 (tcModule pcs hst get_fixity this_mod decls)
+ ; (maybe_tc_result, (warns,errs)) <- initTc dflags env thing_inside
; printErrorsAndWarnings unqual (errs,warns)
- ; printTcDump dflags maybe_tc_result
; if isEmptyBag errs then
return maybe_tc_result
else
return Nothing
}
- where
- fixity_env = mi_fixities mod_iface
-
- get_fixity :: Name -> Maybe Fixity
- get_fixity nm = lookupNameEnv fixity_env nm
\end{code}
The internal monster:
-> (Name -> Maybe Fixity)
-> Module
-> [RenamedHsDecl]
- -> TcM TcResults
+ -> TcM (PersistentCompilerState, TcResults)
tcModule pcs hst get_fixity this_mod decls
- = -- Type-check the type and class 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 decls `thenTc` \ env ->
- tcSetEnv env $
- let
- classes = tcEnvClasses env
- tycons = tcEnvTyCons env -- INCLUDES tycons derived from classes
- in
-
- -- 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
- tycons 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
- -- We must do this before mkImplicitDataBinds (which comes next), since
- -- the latter looks up unpackCStringId, for example, which is usually
- -- imported
--- traceTc (text "Tc3") `thenNF_Tc_`
- 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 this_mod tycons `thenTc` \ (data_ids, imp_data_binds) ->
- mkImplicitClassBinds this_mod 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 $
- tcGetEnv `thenTc` \ unf_env ->
- returnTc (unf_env, new_pcs_insts, local_inst_info, deriv_binds,
- imp_data_binds `AndMonoBinds` imp_cls_binds)
- ) `thenTc` \ (env, new_pcs_insts, local_inst_info, deriv_binds, data_cls_binds) ->
-
+ = -- 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
-- Value declarations next.
-- We also typecheck any extra binds that came out of the "deriving" process
--- traceTc (text "Tc5") `thenNF_Tc_`
- tcTopBinds (get_binds decls `ThenBinds` deriv_binds) `thenTc` \ ((val_binds, env), lie_valdecls) ->
+-- traceTc (text "Tc5") `thenNF_Tc_`
+ tcTopBinds (val_binds `ThenBinds` deriv_binds) `thenTc` \ ((val_binds, env), lie_valdecls) ->
tcSetEnv env $
-- Foreign export declarations next
-- Second pass over class and instance declarations,
-- to compile the bindings themselves.
--- traceTc (text "Tc7") `thenNF_Tc_`
tcInstDecls2 local_inst_info `thenNF_Tc` \ (lie_instdecls, inst_binds) ->
--- traceTc (text "Tc8") `thenNF_Tc_`
- tcClassDecls2 this_mod decls `thenNF_Tc` \ (lie_clasdecls, cls_dm_binds) ->
- tcRules (pcs_rules pcs) this_mod decls `thenNF_Tc` \ (new_pcs_rules, lie_rules, local_rules) ->
+ tcClassDecls2 this_mod tycl_decls `thenNF_Tc` \ (lie_clasdecls, cls_dm_binds) ->
+ tcSourceRules source_rules `thenNF_Tc` \ (lie_rules, more_local_rules) ->
-- Deal with constant or ambiguous InstIds. How could
-- there be ambiguous ones? They can only arise if a
-- during the generalisation step.)
let
lie_alldecls = lie_valdecls `plusLIE`
- lie_instdecls `plusLIE`
- lie_clasdecls `plusLIE`
- lie_fodecls `plusLIE`
- lie_rules
+ lie_instdecls `plusLIE`
+ lie_clasdecls `plusLIE`
+ lie_fodecls `plusLIE`
+ lie_rules
in
tcSimplifyTop lie_alldecls `thenTc` \ const_inst_binds ->
-- Backsubstitution. This must be done last.
-- Even tcSimplifyTop may do some unification.
let
- all_binds = data_cls_binds `AndMonoBinds`
- val_binds `AndMonoBinds`
+ all_binds = val_binds `AndMonoBinds`
inst_binds `AndMonoBinds`
cls_dm_binds `AndMonoBinds`
const_inst_binds `AndMonoBinds`
tcSetEnv final_env $
-- zonkTopBinds puts all the top-level Ids into the tcGEnv
zonkForeignExports foe_decls `thenNF_Tc` \ foe_decls' ->
- zonkRules local_rules `thenNF_Tc` \ local_rules' ->
-
+ zonkRules more_local_rules `thenNF_Tc` \ more_local_rules' ->
- let (local_things, imported_things) = partition (isLocalThing this_mod)
- (nameEnvElts (getTcGEnv final_env))
-
- local_type_env :: TypeEnv
- local_type_env = mkTypeEnv local_things
- new_pte :: PackageTypeEnv
- new_pte = extendTypeEnvList (pcs_PTE pcs) imported_things
-
- final_pcs :: PersistentCompilerState
- final_pcs = pcs { pcs_PTE = new_pte,
- pcs_insts = new_pcs_insts,
- pcs_rules = new_pcs_rules
- }
+ 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 (TcResults { tc_pcs = final_pcs,
- tc_env = local_type_env,
- tc_binds = all_binds',
+ returnTc (new_pcs,
+ TcResults { tc_env = local_type_env,
+ tc_binds = implicit_binds `AndMonoBinds` all_binds',
tc_insts = map iDFunId local_inst_info,
tc_fords = foi_decls ++ foe_decls',
- tc_rules = local_rules'
+ tc_rules = all_local_rules
}
)
-
-get_binds decls = foldr ThenBinds EmptyBinds [binds | ValD binds <- decls]
+ 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}
+\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
+ 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 (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}
%************************************************************************
%* *
\begin{code}
printTcDump dflags Nothing = return ()
-printTcDump dflags (Just results)
+printTcDump dflags (Just (_, results))
= do dumpIfSet_dyn dflags Opt_D_dump_types
"Type signatures" (dump_sigs results)
dumpIfSet_dyn dflags Opt_D_dump_tc
projects / ghc-hetmet.git / blobdiff