#include "HsVersions.h"
-import HsSyn ( HsBinds(..), MonoBinds(..), TyClDecl(..),
- collectMonoBinders )
-import RdrHsSyn ( RdrNameMonoBinds )
-import RnHsSyn ( RenamedHsBinds, RenamedMonoBinds, RenamedTyClDecl, RenamedHsPred )
+import HsSyn
import CmdLineOpts ( DynFlag(..) )
+import Generics ( mkTyConGenericBinds )
import TcRnMonad
-import TcEnv ( tcExtendTempInstEnv, newDFunName,
- InstInfo(..), pprInstInfo, InstBindings(..),
+import TcEnv ( newDFunName,
+ InstInfo(..), InstBindings(..),
pprInstInfoDetails, tcLookupTyCon, tcExtendTyVarEnv
)
import TcGenDeriv -- Deriv stuff
-import InstEnv ( simpleDFunClassTyCon )
-import TcMonoType ( tcHsPred )
+import InstEnv ( simpleDFunClassTyCon, extendInstEnv )
+import TcHsType ( tcHsPred )
import TcSimplify ( tcSimplifyDeriv )
-import RnBinds ( rnMethodBinds, rnTopMonoBinds )
-import RnEnv ( bindLocalsFV, extendTyVarEnvFVRn )
+import RnBinds ( rnMethodBinds, rnTopBinds )
+import RnEnv ( bindLocalNames )
import TcRnMonad ( thenM, returnM, mapAndUnzipM )
-import HscTypes ( DFunId )
+import HscTypes ( DFunId, FixityEnv )
import BasicTypes ( NewOrData(..) )
import Class ( className, classArity, classKey, classTyVars, classSCTheta, Class )
import ErrUtils ( dumpIfSet_dyn )
import MkId ( mkDictFunId )
import DataCon ( dataConOrigArgTys, isNullaryDataCon, isExistentialDataCon )
-import Maybes ( maybeToBool, catMaybes )
-import Name ( Name, getSrcLoc, nameUnique )
-import NameSet
+import Maybes ( catMaybes )
import RdrName ( RdrName )
-
-import TyCon ( tyConTyVars, tyConDataCons, tyConArity,
- tyConTheta, maybeTyConSingleCon, isDataTyCon,
+import Name ( Name, getSrcLoc )
+import NameSet ( NameSet, emptyNameSet, duDefs )
+import Unique ( Unique, getUnique )
+import Kind ( splitKindFunTys )
+import TyCon ( tyConTyVars, tyConDataCons, tyConArity, tyConHasGenerics,
+ tyConTheta, isProductTyCon, isDataTyCon,
isEnumerationTyCon, isRecursiveTyCon, TyCon
)
import TcType ( TcType, ThetaType, mkTyVarTy, mkTyVarTys, mkTyConApp,
- getClassPredTys_maybe,
- isUnLiftedType, mkClassPred, tyVarsOfTypes, tcSplitFunTys, isTypeKind,
+ getClassPredTys_maybe, tcTyConAppTyCon,
+ isUnLiftedType, mkClassPred, tyVarsOfTypes, isArgTypeKind,
tcEqTypes, tcSplitAppTys, mkAppTys, tcSplitDFunTy )
import Var ( TyVar, tyVarKind, idType, varName )
import VarSet ( mkVarSet, subVarSet )
import PrelNames
+import SrcLoc ( srcLocSpan, Located(..) )
import Util ( zipWithEqual, sortLt, notNull )
import ListSetOps ( removeDups, assoc )
import Outputable
+import Bag
\end{code}
%************************************************************************
%************************************************************************
\begin{code}
-tcDeriving :: [RenamedTyClDecl] -- All type constructors
- -> TcM ([InstInfo], -- The generated "instance decls".
- RenamedHsBinds, -- Extra generated bindings
- FreeVars) -- These are free in the generated bindings
+tcDeriving :: [LTyClDecl Name] -- All type constructors
+ -> TcM ([InstInfo], -- The generated "instance decls"
+ [HsBindGroup Name], -- Extra generated top-level bindings
+ NameSet) -- Binders to keep alive
tcDeriving tycl_decls
- = recoverM (returnM ([], EmptyBinds, emptyFVs)) $
- getDOpts `thenM` \ dflags ->
-
- -- Fish the "deriving"-related information out of the TcEnv
- -- and make the necessary "equations".
- makeDerivEqns tycl_decls `thenM` \ (ordinary_eqns, newtype_inst_info) ->
- tcExtendTempInstEnv (map iDFunId newtype_inst_info) $
- -- Add the newtype-derived instances to the inst env
- -- before tacking the "ordinary" ones
-
- deriveOrdinaryStuff ordinary_eqns `thenM` \ (ordinary_inst_info, binds, fvs) ->
- let
- inst_info = newtype_inst_info ++ ordinary_inst_info
- in
-
- ioToTcRn (dumpIfSet_dyn dflags Opt_D_dump_deriv "Derived instances"
- (ddump_deriving inst_info binds)) `thenM_`
-
- returnM (inst_info, binds, fvs)
-
+ = recoverM (returnM ([], [], emptyNameSet)) $
+ do { -- Fish the "deriving"-related information out of the TcEnv
+ -- and make the necessary "equations".
+ ; (ordinary_eqns, newtype_inst_info) <- makeDerivEqns tycl_decls
+
+ ; (ordinary_inst_info, deriv_binds)
+ <- extendLocalInstEnv (map iDFunId newtype_inst_info) $
+ deriveOrdinaryStuff ordinary_eqns
+ -- Add the newtype-derived instances to the inst env
+ -- before tacking the "ordinary" ones
+
+ -- Generate the generic to/from functions from each type declaration
+ ; gen_binds <- mkGenericBinds tycl_decls
+ ; let inst_info = newtype_inst_info ++ ordinary_inst_info
+
+ -- Rename these extra bindings, discarding warnings about unused bindings etc
+ -- Set -fglasgow exts so that we can have type signatures in patterns,
+ -- which is used in the generic binds
+ ; (rn_binds, gen_bndrs)
+ <- discardWarnings $ setOptM Opt_GlasgowExts $ do
+ { (rn_deriv, _dus1) <- rnTopBinds deriv_binds []
+ ; (rn_gen, dus_gen) <- rnTopBinds gen_binds []
+ ; return (rn_deriv ++ rn_gen, duDefs dus_gen) }
+
+
+ ; dflags <- getDOpts
+ ; ioToTcRn (dumpIfSet_dyn dflags Opt_D_dump_deriv "Derived instances"
+ (ddump_deriving inst_info rn_binds))
+
+ ; returnM (inst_info, rn_binds, gen_bndrs)
+ }
where
- ddump_deriving :: [InstInfo] -> RenamedHsBinds -> SDoc
+ ddump_deriving :: [InstInfo] -> [HsBindGroup Name] -> SDoc
ddump_deriving inst_infos extra_binds
- = vcat (map ppr_info inst_infos) $$ ppr extra_binds
-
- ppr_info inst_info = pprInstInfo inst_info $$
- nest 4 (pprInstInfoDetails inst_info)
- -- pprInstInfo doesn't print much: only the type
+ = vcat (map pprInstInfoDetails inst_infos) $$ vcat (map ppr extra_binds)
-----------------------------------------
deriveOrdinaryStuff [] -- Short cut
- = returnM ([], EmptyBinds, emptyFVs)
+ = returnM ([], emptyBag)
deriveOrdinaryStuff eqns
- = -- Take the equation list and solve it, to deliver a list of
- -- solutions, a.k.a. the contexts for the instance decls
- -- required for the corresponding equations.
- solveDerivEqns eqns `thenM` \ new_dfuns ->
-
- -- Now augment the InstInfos, adding in the rather boring
- -- actual-code-to-do-the-methods binds. We may also need to
- -- generate extra not-one-inst-decl-specific binds, notably
- -- "con2tag" and/or "tag2con" functions. We do these
- -- separately.
- gen_taggery_Names new_dfuns `thenM` \ nm_alist_etc ->
+ = do { -- Take the equation list and solve it, to deliver a list of
+ -- solutions, a.k.a. the contexts for the instance decls
+ -- required for the corresponding equations.
+ ; new_dfuns <- solveDerivEqns eqns
- let
- extra_mbind_list = map gen_tag_n_con_monobind nm_alist_etc
- extra_mbinds = foldr AndMonoBinds EmptyMonoBinds extra_mbind_list
- mbinders = collectMonoBinders extra_mbinds
- in
- mappM gen_bind new_dfuns `thenM` \ rdr_name_inst_infos ->
-
- 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_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_inst_infos, rn_extra_binds), fvs) ->
- returnM (rn_inst_infos, rn_extra_binds, fvs)
+ -- Generate the InstInfo for each dfun,
+ -- plus any auxiliary bindings it needs
+ ; (inst_infos, aux_binds_s) <- mapAndUnzipM genInst new_dfuns
- where
- 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)
+ -- Generate any extra not-one-inst-decl-specific binds,
+ -- notably "con2tag" and/or "tag2con" functions.
+ ; extra_binds <- genTaggeryBinds new_dfuns
+
+ -- Done
+ ; returnM (inst_infos, unionManyBags (extra_binds : aux_binds_s))
+ }
+
+-----------------------------------------
+mkGenericBinds tycl_decls
+ = do { tcs <- mapM tcLookupTyCon
+ [ tc_name |
+ L _ (TyData { tcdLName = L _ tc_name }) <- tycl_decls]
+ -- We are only interested in the data type declarations
+ ; return (unionManyBags [ mkTyConGenericBinds tc |
+ tc <- tcs, tyConHasGenerics tc ]) }
+ -- And then only in the ones whose 'has-generics' flag is on
\end{code}
all those.
\begin{code}
-makeDerivEqns :: [RenamedTyClDecl]
+makeDerivEqns :: [LTyClDecl Name]
-> TcM ([DerivEqn], -- Ordinary derivings
[InstInfo]) -- Special newtype derivings
returnM (catMaybes maybe_ordinaries, catMaybes maybe_newtypes)
where
------------------------------------------------------------------
- derive_these :: [(NewOrData, Name, RenamedHsPred)]
+ derive_these :: [(NewOrData, Name, LHsPred Name)]
-- Find the (nd, TyCon, Pred) pairs that must be `derived'
-- NB: only source-language decls have deriving, no imported ones do
derive_these = [ (nd, tycon, pred)
- | TyData {tcdND = nd, tcdName = tycon, tcdDerivs = Just preds} <- tycl_decls,
+ | L _ (TyData { tcdND = nd, tcdLName = L _ tycon,
+ tcdDerivs = Just (L _ preds) }) <- tycl_decls,
pred <- preds ]
------------------------------------------------------------------
- mk_eqn :: (NewOrData, Name, RenamedHsPred) -> TcM (Maybe DerivEqn, Maybe InstInfo)
+ mk_eqn :: (NewOrData, Name, LHsPred Name) -> TcM (Maybe DerivEqn, Maybe InstInfo)
-- We swizzle the tyvars and datacons out of the tycon
-- to make the rest of the equation
mk_eqn (new_or_data, tycon_name, pred)
= tcLookupTyCon tycon_name `thenM` \ tycon ->
- addSrcLoc (getSrcLoc tycon) $
+ addSrcSpan (srcLocSpan (getSrcLoc tycon)) $
addErrCtxt (derivCtxt Nothing tycon) $
tcExtendTyVarEnv (tyConTyVars tycon) $ -- Deriving preds may (now) mention
-- the type variables for the type constructor
------------------------------------------------------------------
mk_eqn_help gla_exts DataType tycon clas tys
- | Just err <- chk_out gla_exts clas tycon tys
+ | Just err <- checkSideConditions gla_exts clas tycon tys
= bale_out (derivingThingErr clas tys tycon tyvars err)
| otherwise
= new_dfun_name clas tycon `thenM` \ dfun_name ->
returnM (Just (dfun_name, clas, tycon, tyvars, constraints), Nothing)
where
- tyvars = tyConTyVars tycon
- data_cons = tyConDataCons tycon
+ tyvars = tyConTyVars tycon
constraints = extra_constraints ++ ordinary_constraints
-- "extra_constraints": see note [Data decl contexts] above
extra_constraints = tyConTheta tycon
]
mk_eqn_help gla_exts NewType tycon clas tys
- | can_derive_via_isomorphism && (gla_exts || standard_class gla_exts clas)
+ | can_derive_via_isomorphism && (gla_exts || std_class_via_iso 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 }))
- | standard_class gla_exts clas
+ | std_class gla_exts clas
= mk_eqn_help gla_exts DataType tycon clas tys -- Go via bale-out route
| otherwise -- Non-standard instance
-- Kind of the thing we want to instance
-- e.g. argument kind of Monad, *->*
- (arg_kinds, _) = tcSplitFunTys kind
+ (arg_kinds, _) = splitKindFunTys kind
n_args_to_drop = length arg_kinds
-- Want to drop 1 arg from (T s a) and (ST s a)
-- to get instance Monad (ST s) => Monad (T s)
right_arity = length tys + 1 == classArity clas
+ -- Never derive Read,Show,Typeable,Data this way
+ non_iso_classes = [readClassKey, showClassKey, typeableClassKey, dataClassKey]
can_derive_via_isomorphism
- = not (clas `hasKey` readClassKey) -- Never derive Read,Show,Typeable this way
- && not (clas `hasKey` showClassKey)
- && not (clas `hasKey` typeableClassKey)
+ = not (getUnique clas `elem` non_iso_classes)
&& right_arity -- Well kinded;
-- eg not: newtype T ... deriving( ST )
-- because ST needs *2* type params
-- Don't want
-- instance Eq [A] => Eq A !!
+ -- Here's a recursive newtype that's actually OK
+ -- newtype S1 = S1 [T1 ()]
+ -- newtype T1 a = T1 (StateT S1 IO a ) deriving( Monad )
+ -- It's currently rejected. Oh well.
+
-- Check that eta reduction is OK
-- (a) the dropped-off args are identical
-- (b) the remaining type args mention
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 :: Bool -> Class -> TyCon -> [TcType] -> Maybe SDoc
- chk_out gla_exts clas tycon tys
- | notNull tys = Just ty_args_why
- | 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
- where
- data_cons = tyConDataCons tycon
- 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
+std_class gla_exts clas
+ = key `elem` derivableClassKeys
+ || (gla_exts && (key == typeableClassKey || key == dataClassKey))
+ where
+ key = classKey clas
+
+std_class_via_iso clas -- These standard classes can be derived for a newtype
+ -- using the isomorphism trick *even if no -fglasgow-exts*
+ = classKey clas `elem` [eqClassKey, ordClassKey, ixClassKey, boundedClassKey]
+ -- Not Read/Show because they respect the type
+ -- Not Enum, becuase newtypes are never in Enum
-non_std_why clas = quotes (ppr clas) <+> ptext SLIT("is not a derivable class")
new_dfun_name clas tycon -- Just a simple wrapper
= newDFunName clas [mkTyConApp tycon []] (getSrcLoc tycon)
-- The type passed to newDFunName is only used to generate
-- a suitable string; hence the empty type arg list
+
+------------------------------------------------------------------
+-- Check side conditions that dis-allow derivability for particular classes
+-- This is *apart* from the newtype-deriving mechanism
+
+checkSideConditions :: Bool -> Class -> TyCon -> [TcType] -> Maybe SDoc
+checkSideConditions gla_exts clas tycon tys
+ | notNull tys
+ = Just ty_args_why -- e.g. deriving( Foo s )
+ | otherwise
+ = case [cond | (key,cond) <- sideConditions, key == getUnique clas] of
+ [] -> Just (non_std_why clas)
+ [cond] -> cond (gla_exts, tycon)
+ other -> pprPanic "checkSideConditions" (ppr clas)
+ where
+ ty_args_why = quotes (ppr (mkClassPred clas tys)) <+> ptext SLIT("is not a class")
+
+non_std_why clas = quotes (ppr clas) <+> ptext SLIT("is not a derivable class")
+
+sideConditions :: [(Unique, Condition)]
+sideConditions
+ = [ (eqClassKey, cond_std),
+ (ordClassKey, cond_std),
+ (readClassKey, cond_std),
+ (showClassKey, cond_std),
+ (enumClassKey, cond_std `andCond` cond_isEnumeration),
+ (ixClassKey, cond_std `andCond` (cond_isEnumeration `orCond` cond_isProduct)),
+ (boundedClassKey, cond_std `andCond` (cond_isEnumeration `orCond` cond_isProduct)),
+ (typeableClassKey, cond_glaExts `andCond` cond_allTypeKind),
+ (dataClassKey, cond_glaExts `andCond` cond_std)
+ ]
+
+type Condition = (Bool, TyCon) -> Maybe SDoc -- Nothing => OK
+
+orCond :: Condition -> Condition -> Condition
+orCond c1 c2 tc
+ = case c1 tc of
+ Nothing -> Nothing -- c1 succeeds
+ Just x -> case c2 tc of -- c1 fails
+ Nothing -> Nothing
+ Just y -> Just (x $$ ptext SLIT(" and") $$ y)
+ -- Both fail
+
+andCond c1 c2 tc = case c1 tc of
+ Nothing -> c2 tc -- c1 succeeds
+ Just x -> Just x -- c1 fails
+
+cond_std :: Condition
+cond_std (gla_exts, tycon)
+ | any isExistentialDataCon data_cons = Just existential_why
+ | null data_cons = Just no_cons_why
+ | otherwise = Nothing
+ where
+ data_cons = tyConDataCons tycon
+ no_cons_why = quotes (ppr tycon) <+> ptext SLIT("has no data constructors")
+ existential_why = quotes (ppr tycon) <+> ptext SLIT("has existentially-quantified constructor(s)")
+
+cond_isEnumeration :: Condition
+cond_isEnumeration (gla_exts, tycon)
+ | isEnumerationTyCon tycon = Nothing
+ | otherwise = Just why
+ where
+ why = quotes (ppr tycon) <+> ptext SLIT("has non-nullary constructors")
+
+cond_isProduct :: Condition
+cond_isProduct (gla_exts, tycon)
+ | isProductTyCon tycon = Nothing
+ | otherwise = Just why
+ where
+ why = quotes (ppr tycon) <+> ptext SLIT("has more than one constructor")
+
+cond_allTypeKind :: Condition
+cond_allTypeKind (gla_exts, tycon)
+ | all (isArgTypeKind . tyVarKind) (tyConTyVars tycon) = Nothing
+ | otherwise = Just why
+ where
+ why = quotes (ppr tycon) <+> ptext SLIT("is parameterised over arguments of kind other than `*'")
+
+cond_glaExts :: Condition
+cond_glaExts (gla_exts, tycon) | gla_exts = Nothing
+ | otherwise = Just why
+ where
+ why = ptext SLIT("You need -fglasgow-exts to derive an instance for this class")
\end{code}
%************************************************************************
checkNoErrs (
-- Extend the inst info from the explicit instance decls
-- with the current set of solutions, and simplify each RHS
- tcExtendTempInstEnv dfuns $
+ extendLocalInstEnv dfuns $
mappM gen_soln orig_eqns
) `thenM` \ new_solns ->
if (current_solns == new_solns) then
------------------------------------------------------------------
gen_soln (_, clas, tc,tyvars,deriv_rhs)
- = addSrcLoc (getSrcLoc tc) $
+ = addSrcSpan (srcLocSpan (getSrcLoc tc)) $
addErrCtxt (derivCtxt (Just clas) tc) $
tcSimplifyDeriv tyvars deriv_rhs `thenM` \ theta ->
returnM (sortLt (<) theta) -- Canonicalise before returning the soluction
mk_deriv_dfun (dfun_name, clas, tycon, tyvars, _) theta
= mkDictFunId dfun_name tyvars theta
clas [mkTyConApp tycon (mkTyVarTys tyvars)]
+
+extendLocalInstEnv :: [DFunId] -> TcM a -> TcM a
+-- Add new locall-defined instances; don't bother to check
+-- for functional dependency errors -- that'll happen in TcInstDcls
+extendLocalInstEnv dfuns thing_inside
+ = do { env <- getGblEnv
+ ; let inst_env' = foldl extendInstEnv (tcg_inst_env env) dfuns
+ env' = env { tcg_inst_env = inst_env' }
+ ; setGblEnv env' thing_inside }
\end{code}
%************************************************************************
\item
We use the renamer!!! Reason: we're supposed to be
-producing @RenamedMonoBinds@ for the methods, but that means
+producing @LHsBinds Name@ for the methods, but that means
producing correctly-uniquified code on the fly. This is entirely
possible (the @TcM@ monad has a @UniqueSupply@), but it is painful.
-So, instead, we produce @RdrNameMonoBinds@ then heave 'em through
+So, instead, we produce @MonoBinds RdrName@ then heave 'em through
the renamer. What a great hack!
\end{itemize}
\begin{code}
--- Generate the method bindings for the required instance
--- (paired with DFunId, as we need that when renaming
--- the method binds)
-gen_bind :: DFunId -> TcM (DFunId, RdrNameMonoBinds)
-gen_bind dfun
+-- Generate the InstInfo for the required instance,
+-- plus any auxiliary bindings required
+genInst :: DFunId -> TcM (InstInfo, LHsBinds RdrName)
+genInst dfun
= getFixityEnv `thenM` \ 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)
- ]
+ (tyvars,_,clas,[ty]) = tcSplitDFunTy (idType dfun)
+ clas_nm = className clas
+ tycon = tcTyConAppTyCon ty
+ (meth_binds, aux_binds) = assoc "gen_bind:bad derived class"
+ gen_list (getUnique clas) fix_env tycon
in
- returnM (dfun, gen_binds_fn tycon)
+ -- Bring the right type variables into
+ -- scope, and rename the method binds
+ bindLocalNames (map varName tyvars) $
+ rnMethodBinds clas_nm [] meth_binds `thenM` \ (rn_meth_binds, _fvs) ->
+
+ -- Build the InstInfo
+ returnM (InstInfo { iDFunId = dfun, iBinds = VanillaInst rn_meth_binds [] },
+ aux_binds)
+
+gen_list :: [(Unique, FixityEnv -> TyCon -> (LHsBinds RdrName, LHsBinds RdrName))]
+gen_list = [(eqClassKey, no_aux_binds (ignore_fix_env gen_Eq_binds))
+ ,(ordClassKey, no_aux_binds (ignore_fix_env gen_Ord_binds))
+ ,(enumClassKey, no_aux_binds (ignore_fix_env gen_Enum_binds))
+ ,(boundedClassKey, no_aux_binds (ignore_fix_env gen_Bounded_binds))
+ ,(ixClassKey, no_aux_binds (ignore_fix_env gen_Ix_binds))
+ ,(typeableClassKey,no_aux_binds (ignore_fix_env gen_Typeable_binds))
+ ,(showClassKey, no_aux_binds gen_Show_binds)
+ ,(readClassKey, no_aux_binds gen_Read_binds)
+ ,(dataClassKey, gen_Data_binds)
+ ]
+
+ -- no_aux_binds is used for generators that don't
+ -- need to produce any auxiliary bindings
+no_aux_binds f fix_env tc = (f fix_env tc, emptyBag)
+ignore_fix_env f fix_env tc = f tc
\end{code}
If we have a @tag2con@ function, we also generate a @maxtag@ constant.
\begin{code}
-gen_taggery_Names :: [DFunId]
- -> TcM [(RdrName, -- for an assoc list
- TyCon, -- related tycon
- TagThingWanted)]
-
-gen_taggery_Names dfuns
- = foldlM do_con2tag [] tycons_of_interest `thenM` \ names_so_far ->
- foldlM do_tag2con names_so_far tycons_of_interest
+genTaggeryBinds :: [DFunId] -> TcM (LHsBinds RdrName)
+genTaggeryBinds dfuns
+ = do { names_so_far <- foldlM do_con2tag [] tycons_of_interest
+ ; nm_alist_etc <- foldlM do_tag2con names_so_far tycons_of_interest
+ ; return (listToBag (map gen_tag_n_con_monobind nm_alist_etc)) }
where
all_CTs = map simpleDFunClassTyCon dfuns
all_tycons = map snd all_CTs
((we_are_deriving eqClassKey tycon
&& any isNullaryDataCon (tyConDataCons tycon))
|| (we_are_deriving ordClassKey tycon
- && not (maybeToBool (maybeTyConSingleCon tycon)))
+ && not (isProductTyCon tycon))
|| (we_are_deriving enumClassKey tycon)
|| (we_are_deriving ixClassKey tycon))