import CmdLineOpts ( DynFlag(..), DynFlags )
import TcMonad
-import TcEnv ( TcEnv, tcSetInstEnv, newDFunName, InstInfo(..), pprInstInfo,
+import TcEnv ( tcSetInstEnv, newDFunName, InstInfo(..), pprInstInfo,
tcLookupClass, tcLookupTyCon
)
import TcGenDeriv -- Deriv stuff
import HscTypes ( DFunId, PersistentRenamerState )
import BasicTypes ( Fixity )
-import Class ( classKey, Class )
+import Class ( className, classKey, Class )
import ErrUtils ( dumpIfSet_dyn, Message )
import MkId ( mkDictFunId )
import DataCon ( dataConArgTys, isNullaryDataCon, isExistentialDataCon )
import PrelInfo ( needsDataDeclCtxtClassKeys )
import Maybes ( maybeToBool, catMaybes )
import Module ( Module )
-import Name ( Name, getSrcLoc )
+import Name ( Name, getSrcLoc, nameUnique )
import RdrName ( RdrName )
import TyCon ( tyConTyVars, tyConDataCons,
tyConTheta, maybeTyConSingleCon, isDataTyCon,
isEnumerationTyCon, TyCon
)
-import Type ( TauType, PredType(..), mkTyVarTys, mkTyConApp, isUnboxedType )
+import TcType ( ThetaType, mkTyVarTys, mkTyConApp,
+ isUnLiftedType, mkClassPred )
import Var ( TyVar )
import PrelNames
import Util ( zipWithEqual, sortLt )
-- The Name is the name for the DFun we'll build
-- The tyvars bind all the variables in the RHS
-type DerivRhs = [(Class, [TauType])] -- Same as a ThetaType!
- --[PredType] -- ... | Class Class [Type==TauType]
-
+type DerivRhs = ThetaType
type DerivSoln = DerivRhs
\end{code}
-- Fish the "deriving"-related information out of the TcEnv
-- and make the necessary "equations".
- makeDerivEqns mod tycl_decls `thenTc` \ eqns ->
+ makeDerivEqns tycl_decls `thenTc` \ eqns ->
if null eqns then
returnTc ([], EmptyBinds)
else
-- Make a Real dfun instead of the dummy one we have so far
gen_inst_info :: DFunId -> RenamedMonoBinds -> InstInfo
gen_inst_info dfun binds
- = InstInfo { iLocal = True, iDFunId = dfun,
- iBinds = binds, iPrags = [] }
+ = InstInfo { iDFunId = dfun, iBinds = binds, iPrags = [] }
- rn_meths meths = rnMethodBinds [] meths `thenRn` \ (meths', _) -> returnRn meths'
- -- Ignore the free vars returned
+ rn_meths (cls, meths) = rnMethodBinds cls [] meths `thenRn` \ (meths', _) ->
+ returnRn meths' -- Ignore the free vars returned
\end{code}
all those.
\begin{code}
-makeDerivEqns :: Module -> [RenamedTyClDecl] -> TcM [DerivEqn]
+makeDerivEqns :: [RenamedTyClDecl] -> TcM [DerivEqn]
-makeDerivEqns this_mod tycl_decls
+makeDerivEqns tycl_decls
= mapTc mk_eqn derive_these `thenTc` \ maybe_eqns ->
returnTc (catMaybes maybe_eqns)
where
-- Find the (Class,TyCon) pairs that must be `derived'
-- NB: only source-language decls have deriving, no imported ones do
derive_these = [ (clas,tycon)
- | TyData _ _ tycon _ _ _ (Just classes) _ _ _ <- tycl_decls,
+ | TyData {tcdName = tycon, tcdDerivs = Just classes} <- tycl_decls,
clas <- nub classes ]
------------------------------------------------------------------
offensive_class = clas_key `elem` needsDataDeclCtxtClassKeys
mk_constraints data_con
- = [ (clas, [arg_ty])
+ = [ mkClassPred clas [arg_ty]
| arg_ty <- dataConArgTys data_con tyvar_tys,
- not (isUnboxedType arg_ty) -- No constraints for unboxed types?
+ not (isUnLiftedType arg_ty) -- No constraints for unlifted types?
]
in
case chk_out clas tycon of
- Just err -> addErrTc err `thenNF_Tc_`
+ Just err -> tcAddSrcLoc (getSrcLoc tycon) $
+ addErrTc err `thenNF_Tc_`
returnNF_Tc Nothing
- Nothing -> newDFunName this_mod clas [ty] locn `thenNF_Tc` \ dfun_name ->
+ Nothing -> newDFunName clas [ty] locn `thenNF_Tc` \ dfun_name ->
returnNF_Tc (Just (dfun_name, clas, tycon, tyvars, constraints))
------------------------------------------------------------------
chk_out :: Class -> TyCon -> Maybe Message
chk_out clas tycon
- | clas `hasKey` enumClassKey && not is_enumeration = bog_out nullary_why
+ | clas `hasKey` enumClassKey && not is_enumeration = bog_out nullary_why
| clas `hasKey` boundedClassKey && not is_enumeration_or_single = bog_out single_nullary_why
| clas `hasKey` ixClassKey && not is_enumeration_or_single = bog_out single_nullary_why
- | any isExistentialDataCon (tyConDataCons tycon) = Just (existentialErr clas tycon)
- | otherwise = Nothing
+ | null data_cons = bog_out no_cons_why
+ | any isExistentialDataCon data_cons = Just (existentialErr clas tycon)
+ | otherwise = Nothing
where
+ data_cons = tyConDataCons tycon
is_enumeration = isEnumerationTyCon tycon
is_single_con = maybeToBool (maybeTyConSingleCon tycon)
is_enumeration_or_single = is_enumeration || is_single_con
single_nullary_why = SLIT("one constructor data type or type with all nullary constructors expected")
nullary_why = SLIT("data type with all nullary constructors expected")
+ no_cons_why = SLIT("type has no data constructors")
bog_out why = Just (derivingThingErr clas tycon why)
\end{code}
in
-- Simplify each RHS
tcSetInstEnv inst_env (
- listTc [ tcAddErrCtxt (derivCtxt tc) $
+ listTc [ tcAddSrcLoc (getSrcLoc tc) $
+ tcAddErrCtxt (derivCtxt tc) $
tcSimplifyThetas deriv_rhs
| (_, _,tc,_,deriv_rhs) <- orig_eqns ]
) `thenTc` \ next_solns ->
-- They'll appear later, when we do the top-level extendInstEnvs
mk_deriv_dfun (dfun_name, clas, tycon, tyvars, _) theta
- = mkDictFunId dfun_name clas tyvars [mkTyConApp tycon (mkTyVarTys tyvars)]
- (map pair2PredType theta)
-
- pair2PredType (clas, tautypes) = Class clas tautypes
+ = mkDictFunId dfun_name clas tyvars
+ [mkTyConApp tycon (mkTyVarTys tyvars)]
+ theta
\end{code}
%************************************************************************
\begin{code}
-- Generate the method bindings for the required instance
--- (paired with class name, as we need that when generating dict
--- names.)
-gen_bind :: (Name -> Maybe Fixity) -> DFunId -> RdrNameMonoBinds
+-- (paired with class name, as we need that when renaming
+-- the method binds)
+gen_bind :: (Name -> Maybe Fixity) -> DFunId -> (Name, RdrNameMonoBinds)
gen_bind get_fixity dfun
- | clas `hasKey` showClassKey = gen_Show_binds get_fixity tycon
- | clas `hasKey` readClassKey = gen_Read_binds get_fixity tycon
- | otherwise
- = assoc "gen_bind:bad derived class"
- [(eqClassKey, gen_Eq_binds)
- ,(ordClassKey, gen_Ord_binds)
- ,(enumClassKey, gen_Enum_binds)
- ,(boundedClassKey, gen_Bounded_binds)
- ,(ixClassKey, gen_Ix_binds)
- ]
- (classKey clas)
- tycon
+ = (cls_nm, binds)
where
+ cls_nm = className clas
(clas, tycon) = simpleDFunClassTyCon dfun
+
+ binds = assoc "gen_bind:bad derived class" gen_list
+ (nameUnique cls_nm) tycon
+
+ gen_list = [(eqClassKey, gen_Eq_binds)
+ ,(ordClassKey, gen_Ord_binds)
+ ,(enumClassKey, gen_Enum_binds)
+ ,(boundedClassKey, gen_Bounded_binds)
+ ,(ixClassKey, gen_Ix_binds)
+ ,(showClassKey, gen_Show_binds get_fixity)
+ ,(readClassKey, gen_Read_binds get_fixity)
+ ]
\end{code}
con2tag_Foo :: Foo ... -> Int#
tag2con_Foo :: Int -> Foo ... -- easier if Int, not Int#
-maxtag_Foo :: Int -- ditto (NB: not unboxed)
+maxtag_Foo :: Int -- ditto (NB: not unlifted)
We have a @con2tag@ function for a tycon if:
projects / ghc-hetmet.git / blobdiff