realFloatClassName, -- numeric
cCallableClassName, -- mentioned, ccallish
cReturnableClassName, -- mentioned, ccallish
+ traverseClassName,
+ typeableClassName,
-- Numeric stuff
negateName, minusName,
pREL_FLOAT_Name = mkModuleName "GHC.Float"
pREL_TOP_HANDLER_Name = mkModuleName "GHC.TopHandler"
sYSTEM_IO_Name = mkModuleName "System.IO"
+dYNAMIC_Name = mkModuleName "Data.Dynamic"
+tRAVERSE_Name = mkModuleName "Data.Traverse"
rEAD_PREC_Name = mkModuleName "Text.ParserCombinators.ReadPrec"
lEX_Name = mkModuleName "Text.Read.Lex"
showString_RDR = varQual_RDR pREL_SHOW_Name FSLIT("showString")
showSpace_RDR = varQual_RDR pREL_SHOW_Name FSLIT("showSpace")
showParen_RDR = varQual_RDR pREL_SHOW_Name FSLIT("showParen")
+
+typeOf_RDR = varQual_RDR dYNAMIC_Name FSLIT("typeOf")
+mkTypeRep_RDR = varQual_RDR dYNAMIC_Name FSLIT("mkAppTy")
+mkTyConRep_RDR = varQual_RDR dYNAMIC_Name FSLIT("mkTyCon")
+
+undefined_RDR = varQual_RDR pREL_ERR_Name FSLIT("undefined")
+
+gmapQ_RDR = varQual_RDR tRAVERSE_Name FSLIT("gmapQ")
+gmapT_RDR = varQual_RDR tRAVERSE_Name FSLIT("gmapT")
+gmapM_RDR = varQual_RDR tRAVERSE_Name FSLIT("gmapM")
+gfoldl_RDR = varQual_RDR tRAVERSE_Name FSLIT("gfoldl")
\end{code}
-- Class Ix
ixClassName = clsQual pREL_ARR_Name FSLIT("Ix") ixClassKey
+-- Class Typeable and Traverse
+typeableClassName = clsQual dYNAMIC_Name FSLIT("Typeable") typeableClassKey
+traverseClassName = clsQual tRAVERSE_Name FSLIT("Traverse") traverseClassKey
+
-- Enum module (Enum, Bounded)
enumClassName = clsQual pREL_ENUM_Name FSLIT("Enum") enumClassKey
enumFromName = varQual pREL_ENUM_Name FSLIT("enumFrom") enumFromClassOpKey
boundedClassKey = mkPreludeClassUnique 1
enumClassKey = mkPreludeClassUnique 2
eqClassKey = mkPreludeClassUnique 3
+typeableClassKey = mkPreludeClassUnique 4
floatingClassKey = mkPreludeClassUnique 5
fractionalClassKey = mkPreludeClassUnique 6
integralClassKey = mkPreludeClassUnique 7
monadClassKey = mkPreludeClassUnique 8
+traverseClassKey = mkPreludeClassUnique 9
functorClassKey = mkPreludeClassUnique 10
numClassKey = mkPreludeClassUnique 11
ordClassKey = mkPreludeClassUnique 12
realFloatClassKey = mkPreludeClassUnique 15
realFracClassKey = mkPreludeClassUnique 16
showClassKey = mkPreludeClassUnique 17
-
cCallableClassKey = mkPreludeClassUnique 18
cReturnableClassKey = mkPreludeClassUnique 19
-
ixClassKey = mkPreludeClassUnique 20
\end{code}
import TcSimplify ( tcSimplifyDeriv )
import RnBinds ( rnMethodBinds, rnTopMonoBinds )
-import RnEnv ( bindLocalsFV )
+import RnEnv ( bindLocalsFV, extendTyVarEnvFVRn )
import TcRnMonad ( thenM, returnM, mapAndUnzipM )
import HscTypes ( DFunId )
isEnumerationTyCon, isRecursiveTyCon, TyCon
)
import TcType ( TcType, ThetaType, mkTyVarTys, mkTyConApp, getClassPredTys_maybe,
- isUnLiftedType, mkClassPred, tyVarsOfTypes, tcSplitFunTys,
- tcEqTypes, tcSplitAppTys, mkAppTys )
-import Var ( TyVar, tyVarKind )
+ isUnLiftedType, mkClassPred, tyVarsOfTypes, tcSplitFunTys, isTypeKind,
+ tcEqTypes, tcSplitAppTys, mkAppTys, tcSplitDFunTy )
+import Var ( TyVar, tyVarKind, idType, varName )
import VarSet ( mkVarSet, subVarSet )
import PrelNames
import Util ( zipWithEqual, sortLt, notNull )
extra_mbinds = foldr AndMonoBinds EmptyMonoBinds extra_mbind_list
mbinders = collectMonoBinders extra_mbinds
in
- mappM gen_bind new_dfuns `thenM` \ method_binds_s ->
+ mappM gen_bind new_dfuns `thenM` \ rdr_name_inst_infos ->
- traceTc (text "tcDeriv" <+> ppr method_binds_s) `thenM_`
- getModule `thenM` \ this_mod ->
+ traceTc (text "tcDeriv" <+> vcat (map ppr rdr_name_inst_infos)) `thenM_`
+ getModule `thenM` \ this_mod ->
initRn (InterfaceMode this_mod) (
-- Rename to get RenamedBinds.
-- The only tricky bit is that the extra_binds must scope
-- over the method bindings for the instances.
bindLocalsFV (ptext (SLIT("deriving"))) mbinders $ \ _ ->
rnTopMonoBinds extra_mbinds [] `thenM` \ (rn_extra_binds, dus) ->
- mapAndUnzipM rn_meths method_binds_s `thenM` \ (rn_method_binds_s, fvs_s) ->
- returnM ((rn_method_binds_s, rn_extra_binds),
+ mapAndUnzipM rn_inst_info rdr_name_inst_infos `thenM` \ (rn_inst_infos, fvs_s) ->
+ returnM ((rn_inst_infos, rn_extra_binds),
duUses dus `plusFV` plusFVs fvs_s)
- ) `thenM` \ ((rn_method_binds_s, rn_extra_binds), fvs) ->
- let
- new_inst_infos = zipWith gen_inst_info new_dfuns rn_method_binds_s
- in
- returnM (new_inst_infos, rn_extra_binds, fvs)
+ ) `thenM` \ ((rn_inst_infos, rn_extra_binds), fvs) ->
+ returnM (rn_inst_infos, rn_extra_binds, fvs)
where
- -- 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 { iDFunId = dfun, iBinds = VanillaInst binds [] }
-
- rn_meths (cls, meths) = rnMethodBinds cls [] meths
+ rn_inst_info (dfun, binds)
+ = extendTyVarEnvFVRn (map varName tyvars) $
+ -- Bring the right type variables into scope
+ rnMethodBinds (className cls) [] binds `thenM` \ (rn_binds, fvs) ->
+ return (InstInfo { iDFunId = dfun, iBinds = VanillaInst rn_binds [] }, fvs)
+ where
+ (tyvars, _, cls, _) = tcSplitDFunTy (idType dfun)
\end{code}
tcHsPred pred `thenM` \ pred' ->
case getClassPredTys_maybe pred' of
Nothing -> bale_out (malformedPredErr tycon pred)
- Just (clas, tys) -> mk_eqn_help new_or_data tycon clas tys
+ Just (clas, tys) -> doptM Opt_GlasgowExts `thenM` \ gla_exts ->
+ mk_eqn_help gla_exts new_or_data tycon clas tys
------------------------------------------------------------------
- mk_eqn_help DataType tycon clas tys
- | Just err <- chk_out clas tycon tys
+ mk_eqn_help gla_exts DataType tycon clas tys
+ | Just err <- chk_out gla_exts clas tycon tys
= bale_out (derivingThingErr clas tys tycon tyvars err)
| otherwise
= new_dfun_name clas tycon `thenM` \ dfun_name ->
-- "extra_constraints": see note [Data decl contexts] above
extra_constraints = tyConTheta tycon
- mk_eqn_help NewType tycon clas tys
- = doptM Opt_GlasgowExts `thenM` \ gla_exts ->
- if can_derive_via_isomorphism && (gla_exts || standard_instance) then
- -- Go ahead and use the isomorphism
+ mk_eqn_help gla_exts NewType tycon clas tys
+ | can_derive_via_isomorphism && (gla_exts || standard_class gla_exts clas)
+ = -- Go ahead and use the isomorphism
traceTc (text "newtype deriving:" <+> ppr tycon <+> ppr rep_tys) `thenM_`
new_dfun_name clas tycon `thenM` \ dfun_name ->
returnM (Nothing, Just (InstInfo { iDFunId = mk_dfun dfun_name,
iBinds = NewTypeDerived rep_tys }))
- else
- if standard_instance then
- mk_eqn_help DataType tycon clas [] -- Go via bale-out route
- else
- -- Non-standard instance
- if gla_exts then
- -- Too hard
- bale_out cant_derive_err
- else
- -- Just complain about being a non-std instance
- bale_out non_std_err
+ | standard_class gla_exts clas
+ = mk_eqn_help gla_exts DataType tycon clas tys -- Go via bale-out route
+
+ | otherwise -- Non-standard instance
+ = bale_out (if gla_exts then
+ cant_derive_err -- Too hard
+ else
+ non_std_err) -- Just complain about being a non-std instance
where
-- Here is the plan for newtype derivings. We see
-- newtype T a1...an = T (t ak...an) deriving (.., C s1 .. sm, ...)
-------------------------------------------------------------------
-- Figuring out whether we can only do this newtype-deriving thing
- standard_instance = null tys && classKey clas `elem` derivableClassKeys
right_arity = length tys + 1 == classArity clas
can_derive_via_isomorphism
- = not (clas `hasKey` readClassKey) -- Never derive Read,Show this way
+ = not (clas `hasKey` readClassKey) -- Never derive Read,Show,Typeable this way
&& not (clas `hasKey` showClassKey)
+ && not (clas `hasKey` typeableClassKey)
&& right_arity -- Well kinded;
-- eg not: newtype T ... deriving( ST )
-- because ST needs *2* type params
bale_out err = addErrTc err `thenM_` returnM (Nothing, Nothing)
+ standard_class gla_exts clas = key `elem` derivableClassKeys
+ || (gla_exts && (key == typeableClassKey || key == traverseClassKey))
+ where
+ key = classKey clas
------------------------------------------------------------------
- chk_out :: Class -> TyCon -> [TcType] -> Maybe SDoc
- chk_out clas tycon tys
+ chk_out :: Bool -> Class -> TyCon -> [TcType] -> Maybe SDoc
+ chk_out gla_exts clas tycon tys
| notNull tys = Just ty_args_why
- | not (getUnique clas `elem` derivableClassKeys) = Just (non_std_why clas)
+ | not (standard_class gla_exts clas) = Just (non_std_why clas)
| clas `hasKey` enumClassKey && not is_enumeration = Just nullary_why
| clas `hasKey` boundedClassKey && not is_enumeration_or_single = Just single_nullary_why
| clas `hasKey` ixClassKey && not is_enumeration_or_single = Just single_nullary_why
+ | clas `hasKey` typeableClassKey && not all_type_kind = Just not_type_kind_why
| null data_cons = Just no_cons_why
| any isExistentialDataCon data_cons = Just existential_why
| otherwise = Nothing
is_enumeration = isEnumerationTyCon tycon
is_single_con = maybeToBool (maybeTyConSingleCon tycon)
is_enumeration_or_single = is_enumeration || is_single_con
+ all_type_kind = all (isTypeKind . tyVarKind) (tyConTyVars tycon)
single_nullary_why = ptext SLIT("one constructor data type or type with all nullary constructors expected")
nullary_why = quotes (ppr tycon) <+> ptext SLIT("has non-nullary constructors")
no_cons_why = quotes (ppr tycon) <+> ptext SLIT("has no data constructors")
ty_args_why = quotes (ppr pred) <+> ptext SLIT("is not a class")
existential_why = quotes (ppr tycon) <+> ptext SLIT("has existentially-quantified constructor(s)")
+ not_type_kind_why = quotes (ppr tycon) <+> ptext SLIT("is parameterised over arguments of kind other than `*'")
pred = mkClassPred clas tys
\begin{code}
-- Generate the method bindings for the required instance
--- (paired with class name, as we need that when renaming
+-- (paired with DFunId, as we need that when renaming
-- the method binds)
-gen_bind :: DFunId -> TcM (Name, RdrNameMonoBinds)
+gen_bind :: DFunId -> TcM (DFunId, RdrNameMonoBinds)
gen_bind dfun
= getFixityEnv `thenM` \ fix_env ->
- returnM (cls_nm, gen_binds_fn fix_env cls_nm tycon)
- where
- cls_nm = className clas
- (clas, tycon) = simpleDFunClassTyCon dfun
-
-gen_binds_fn fix_env cls_nm
- = assoc "gen_bind:bad derived class"
- gen_list (nameUnique cls_nm)
- where
- 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 fix_env)
- ,(readClassKey, gen_Read_binds fix_env)
- ]
+ let
+ (clas, tycon) = simpleDFunClassTyCon dfun
+ gen_binds_fn = assoc "gen_bind:bad derived class"
+ gen_list (getUnique clas)
+
+ 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 fix_env)
+ ,(readClassKey, gen_Read_binds fix_env)
+ ,(typeableClassKey,gen_Typeable_binds)
+ ]
+ in
+ returnM (dfun, gen_binds_fn tycon)
\end{code}
projects / ghc-hetmet.git / commitdiff