andMonoBindList
)
import RnHsSyn ( RenamedHsBinds, RenamedInstDecl, RenamedHsDecl )
-import TcHsSyn ( TcMonoBinds,
- maybeBoxedPrimType
- )
+import TcHsSyn ( TcMonoBinds, mkHsConApp )
import TcBinds ( tcSpecSigs )
import TcClassDcl ( tcMethodBind, checkFromThisClass )
import TcMonad
-import RnMonad ( RnNameSupply, Fixities )
+import RnMonad ( RnNameSupply, FixityEnv )
import Inst ( Inst, InstOrigin(..),
- newDicts, LIE, emptyLIE, plusLIE, plusLIEs )
+ newDicts, newClassDicts,
+ LIE, emptyLIE, plusLIE, plusLIEs )
import TcDeriv ( tcDeriving )
import TcEnv ( ValueEnv, tcExtendGlobalValEnv, tcExtendTyVarEnvForMeths,
tcAddImportedIdInfo, tcInstId
import CmdLineOpts ( opt_GlasgowExts, opt_AllowUndecidableInstances )
import Class ( classBigSig, Class )
import Var ( idName, idType, Id, TyVar )
-import DataCon ( isNullaryDataCon, dataConArgTys, dataConId )
+import DataCon ( isNullaryDataCon, splitProductType_maybe )
import Maybes ( maybeToBool, catMaybes, expectJust )
import MkId ( mkDictFunId )
import Module ( ModuleName )
import PrelInfo ( eRROR_ID )
import PprType ( pprConstraint )
import SrcLoc ( SrcLoc )
-import TyCon ( isSynTyCon, isDataTyCon, tyConDerivings )
+import TyCon ( isSynTyCon, tyConDerivings )
import Type ( Type, isUnLiftedType, mkTyVarTys,
splitSigmaTy, isTyVarTy,
- splitTyConApp_maybe, splitDictTy_maybe, unUsgTy,
- splitAlgTyConApp_maybe,
- tyVarsOfTypes
+ splitTyConApp_maybe, splitDictTy_maybe,
+ getClassTys_maybe, splitAlgTyConApp_maybe,
+ classesToPreds, classesOfPreds,
+ unUsgTy, tyVarsOfTypes
)
-import Subst ( mkTopTyVarSubst, substTheta )
+import Subst ( mkTopTyVarSubst, substClasses )
import VarSet ( mkVarSet, varSetElems )
import TysPrim ( byteArrayPrimTyCon, mutableByteArrayPrimTyCon )
-import TysWiredIn ( stringTy )
-import Unique ( Unique, cCallableClassKey, cReturnableClassKey, Uniquable(..) )
+import TysWiredIn ( stringTy, isFFIArgumentTy, isFFIResultTy )
+import Unique ( Unique, cCallableClassKey, cReturnableClassKey, hasKey, Uniquable(..) )
import Outputable
\end{code}
tcInstDecls1 :: ValueEnv -- Contains IdInfo for dfun ids
-> [RenamedHsDecl]
-> ModuleName -- module name for deriving
- -> Fixities
+ -> FixityEnv
-> RnNameSupply -- for renaming derivings
-> TcM s (Bag InstInfo,
RenamedHsBinds)
tcHsTopType poly_ty `thenTc` \ poly_ty' ->
let
(tyvars, theta, dict_ty) = splitSigmaTy poly_ty'
- (clas, inst_tys) = case splitDictTy_maybe dict_ty of
- Nothing -> pprPanic "tcInstDecl1" (ppr poly_ty)
- Just pair -> pair
+ constr = classesOfPreds theta
+ (clas, inst_tys) = case splitDictTy_maybe dict_ty of
+ Just ct -> ct
+ Nothing -> pprPanic "tcInstDecl1" (ppr poly_ty)
in
-- Check for respectable instance type, and context
-- instance CCallable [Char]
(if isLocallyDefined dfun_name then
scrutiniseInstanceHead clas inst_tys `thenNF_Tc_`
- mapNF_Tc scrutiniseInstanceConstraint theta
+ mapNF_Tc scrutiniseInstanceConstraint constr
else
returnNF_Tc []
) `thenNF_Tc_`
-- Make the dfun id
let
- dfun_id = mkDictFunId dfun_name clas tyvars inst_tys theta
+ dfun_id = mkDictFunId dfun_name clas tyvars inst_tys constr
-- Add info from interface file
final_dfun_id = tcAddImportedIdInfo unf_env dfun_id
in
- returnTc (unitBag (InstInfo clas tyvars inst_tys theta
+ returnTc (unitBag (InstInfo clas tyvars inst_tys constr
final_dfun_id
binds src_loc uprags))
\end{code}
origin = InstanceDeclOrigin
- (class_tyvars,
- sc_theta, sc_sel_ids,
- op_sel_ids, defm_ids) = classBigSig clas
+ (class_tyvars, sc_theta, _, op_items) = classBigSig clas
+
+ dm_ids = [dm_id | (_, dm_id, _) <- op_items]
-- Instantiate the theta found in the original instance decl
- inst_decl_theta' = substTheta (mkTopTyVarSubst inst_tyvars (mkTyVarTys inst_tyvars'))
- inst_decl_theta
+ inst_decl_theta' = substClasses (mkTopTyVarSubst inst_tyvars (mkTyVarTys inst_tyvars'))
+ inst_decl_theta
-- Instantiate the super-class context with inst_tys
- sc_theta' = substTheta (mkTopTyVarSubst class_tyvars inst_tys') sc_theta
+ sc_theta' = substClasses (mkTopTyVarSubst class_tyvars inst_tys') sc_theta
in
-- Create dictionary Ids from the specified instance contexts.
- newDicts origin sc_theta' `thenNF_Tc` \ (sc_dicts, sc_dict_ids) ->
+ newClassDicts origin sc_theta' `thenNF_Tc` \ (sc_dicts, sc_dict_ids) ->
newDicts origin dfun_theta' `thenNF_Tc` \ (dfun_arg_dicts, dfun_arg_dicts_ids) ->
- newDicts origin inst_decl_theta' `thenNF_Tc` \ (inst_decl_dicts, _) ->
- newDicts origin [(clas,inst_tys')] `thenNF_Tc` \ (this_dict, [this_dict_id]) ->
+ newClassDicts origin inst_decl_theta' `thenNF_Tc` \ (inst_decl_dicts, _) ->
+ newClassDicts origin [(clas,inst_tys')] `thenNF_Tc` \ (this_dict, [this_dict_id]) ->
-- Check that all the method bindings come from this class
- checkFromThisClass clas op_sel_ids monobinds `thenNF_Tc_`
+ checkFromThisClass clas op_items monobinds `thenNF_Tc_`
tcExtendTyVarEnvForMeths inst_tyvars inst_tyvars' (
- tcExtendGlobalValEnv (catMaybes defm_ids) (
+ tcExtendGlobalValEnv dm_ids (
-- Default-method Ids may be mentioned in synthesised RHSs
- mapAndUnzip3Tc (tcMethodBind clas origin inst_tyvars' inst_tys' inst_decl_theta'
- monobinds uprags True)
- (op_sel_ids `zip` defm_ids)
+ mapAndUnzip3Tc (tcMethodBind clas origin inst_tyvars' inst_tys'
+ (classesToPreds inst_decl_theta')
+ monobinds uprags True)
+ op_items
)) `thenTc` \ (method_binds_s, insts_needed_s, meth_lies_w_ids) ->
-- Deal with SPECIALISE instance pragmas by making them
(HsLitOut (HsString msg) stringTy)
| otherwise -- The common case
- = foldl HsApp (TyApp (HsVar (dataConId dict_constr)) inst_tys')
- (map HsVar (sc_dict_ids ++ meth_ids))
+ = mkHsConApp dict_constr inst_tys' (map HsVar (sc_dict_ids ++ meth_ids))
-- We don't produce a binding for the dict_constr; instead we
-- rely on the simplifier to unfold this saturated application
-- We do this rather than generate an HsCon directly, because
-- it means that the special cases (e.g. dictionary with only one
- -- member) are dealt with by the common MkId.mkDataConId code rather
+ -- member) are dealt with by the common MkId.mkDataConWrapId code rather
-- than needing to be repeated here.
where
| otherwise = addErrTc (instConstraintErr clas tys)
scrutiniseInstanceHead clas inst_taus
- | -- CCALL CHECK (a).... urgh!
- -- To verify that a user declaration of a CCallable/CReturnable
- -- instance is OK, we must be able to see the constructor(s)
- -- of the instance type (see next guard.)
- --
- -- We flag this separately to give a more precise error msg.
- --
- (getUnique clas == cCallableClassKey || getUnique clas == cReturnableClassKey)
- && is_alg_tycon_app && not constructors_visible
- = addErrTc (invisibleDataConPrimCCallErr clas first_inst_tau)
-
- | -- CCALL CHECK (b)
+ | -- CCALL CHECK
-- A user declaration of a CCallable/CReturnable instance
-- must be for a "boxed primitive" type.
- (getUnique clas == cCallableClassKey && not (ccallable_type first_inst_tau)) ||
- (getUnique clas == cReturnableClassKey && not (creturnable_type first_inst_tau))
+ (clas `hasKey` cCallableClassKey && not (ccallable_type first_inst_tau)) ||
+ (clas `hasKey` cReturnableClassKey && not (creturnable_type first_inst_tau))
= addErrTc (nonBoxedPrimCCallErr clas first_inst_tau)
-- DERIVING CHECK
Just (tycon, arg_tys) = maybe_tycon_app
-- Stuff for an *algebraic* data type
- alg_tycon_app_maybe = splitAlgTyConApp_maybe first_inst_tau
- -- The "Alg" part looks through synonyms
- is_alg_tycon_app = maybeToBool alg_tycon_app_maybe
- Just (alg_tycon, _, data_cons) = alg_tycon_app_maybe
-
- constructors_visible = not (null data_cons)
+ alg_tycon_app_maybe = splitAlgTyConApp_maybe first_inst_tau
+ -- The "Alg" part looks through synonyms
+ Just (alg_tycon, _, _) = alg_tycon_app_maybe
-
--- These conditions come directly from what the DsCCall is capable of.
--- Totally grotesque. Green card should solve this.
-
-ccallable_type ty = isUnLiftedType ty || -- Allow CCallable Int# etc
- maybeToBool (maybeBoxedPrimType ty) || -- Ditto Int etc
- ty == stringTy ||
- byte_arr_thing
- where
- byte_arr_thing = case splitAlgTyConApp_maybe ty of
- Just (tycon, ty_args, [data_con]) | isDataTyCon tycon ->
- length data_con_arg_tys == 2 &&
- maybeToBool maybe_arg2_tycon &&
- (arg2_tycon == byteArrayPrimTyCon ||
- arg2_tycon == mutableByteArrayPrimTyCon)
- where
- data_con_arg_tys = dataConArgTys data_con ty_args
- (data_con_arg_ty1 : data_con_arg_ty2 : _) = data_con_arg_tys
- maybe_arg2_tycon = splitTyConApp_maybe data_con_arg_ty2
- Just (arg2_tycon,_) = maybe_arg2_tycon
-
- other -> False
-
-creturnable_type ty = maybeToBool (maybeBoxedPrimType ty) ||
- -- Or, a data type with a single nullary constructor
- case (splitAlgTyConApp_maybe ty) of
- Just (tycon, tys_applied, [data_con])
- -> isNullaryDataCon data_con
- other -> False
+ccallable_type ty = isFFIArgumentTy False {- Not safe call -} ty
+creturnable_type ty = isFFIResultTy ty
\end{code}
\begin{code}
instConstraintErr clas tys
- = hang (ptext SLIT("Illegal constaint") <+>
+ = hang (ptext SLIT("Illegal constraint") <+>
quotes (pprConstraint clas tys) <+>
ptext SLIT("in instance context"))
4 (ptext SLIT("(Instance contexts must constrain only type variables)"))
4 (hsep [ ptext SLIT("class"), ppr clas, ptext SLIT("type"),
ppr inst_ty])
-{-
- Declaring CCallable & CReturnable instances in a module different
- from where the type was defined. Caused by importing data type
- abstractly (either programmatically or by the renamer being over-eager
- in its pruning.)
--}
-invisibleDataConPrimCCallErr clas inst_ty
- = hang (hsep [ptext SLIT("Constructors for"), quotes (ppr inst_ty),
- ptext SLIT("not visible when checking"),
- quotes (ppr clas), ptext SLIT("instance")])
- 4 (hsep [text "(Try either importing", ppr inst_ty,
- text "non-abstractly or compile using -fno-prune-tydecls ..)"])
-
methodCtxt = ptext SLIT("When checking the methods of an instance declaration")
superClassCtxt = ptext SLIT("When checking the superclasses of an instance declaration")
\end{code}
projects / ghc-hetmet.git / blobdiff