splitTyConApp_maybe, splitTyConApp,
splitNewTyConApp_maybe, splitNewTyConApp,
- repType, repType', typePrimRep, coreView, tcView, kindView,
+ repType, typePrimRep, coreView, tcView, kindView, rttiView,
mkForAllTy, mkForAllTys, splitForAllTy_maybe, splitForAllTys,
applyTy, applyTys, isForAllTy, dropForAlls,
newTyConInstRhs,
-- Lifting and boxity
- isUnLiftedType, isUnboxedTupleType, isAlgType, isPrimitiveType,
- isStrictType, isStrictPred,
+ isUnLiftedType, isUnboxedTupleType, isAlgType, isClosedAlgType,
+ isPrimitiveType, isStrictType, isStrictPred,
-- Free variables
tyVarsOfType, tyVarsOfTypes, tyVarsOfPred, tyVarsOfTheta,
tcView ty = Nothing
-----------------------------------------------
+rttiView :: Type -> Type
+-- Same, but for the RTTI system, which cannot deal with predicates nor polymorphism
+rttiView (ForAllTy _ ty) = rttiView ty
+rttiView (NoteTy _ ty) = rttiView ty
+rttiView (FunTy PredTy{} ty) = rttiView ty
+rttiView (FunTy NoteTy{} ty) = rttiView ty
+rttiView ty@TyConApp{} | Just ty' <- coreView ty
+ = rttiView ty'
+rttiView (TyConApp tc tys) = mkTyConApp tc (map rttiView tys)
+rttiView ty = ty
+
+-----------------------------------------------
{-# INLINE kindView #-}
kindView :: Kind -> Maybe Kind
-- C.f. coreView, tcView
-- Does the AppTy split, but assumes that any view stuff is already done
repSplitAppTy_maybe (FunTy ty1 ty2) = Just (TyConApp funTyCon [ty1], ty2)
repSplitAppTy_maybe (AppTy ty1 ty2) = Just (ty1, ty2)
-repSplitAppTy_maybe (TyConApp tc tys) = case snocView tys of
- Just (tys', ty') -> Just (TyConApp tc tys', ty')
- Nothing -> Nothing
-repSplitAppTy_maybe other = Nothing
+repSplitAppTy_maybe (TyConApp tc tys)
+ | not (isOpenSynTyCon tc) || length tys > tyConArity tc
+ = case snocView tys of -- never create unsaturated type family apps
+ Just (tys', ty') -> Just (TyConApp tc tys', ty')
+ Nothing -> Nothing
+repSplitAppTy_maybe _other = Nothing
-------------
splitAppTy :: Type -> (Type, Type)
splitAppTy ty = case splitAppTy_maybe ty of
where
split orig_ty ty args | Just ty' <- coreView ty = split orig_ty ty' args
split orig_ty (AppTy ty arg) args = split ty ty (arg:args)
- split orig_ty (TyConApp tc tc_args) args = (TyConApp tc [], tc_args ++ args)
+ split orig_ty (TyConApp tc tc_args) args
+ = let -- keep type families saturated
+ n | isOpenSynTyCon tc = tyConArity tc
+ | otherwise = 0
+ (tc_args1, tc_args2) = splitAt n tc_args
+ in
+ (TyConApp tc tc_args1, tc_args2 ++ args)
split orig_ty (FunTy ty1 ty2) args = ASSERT( null args )
(TyConApp funTyCon [], [ty1,ty2])
split orig_ty ty args = (orig_ty, args)
repType ty = ty
--- repType' aims to be a more thorough version of repType
--- For now it simply looks through the TyConApp args too
-repType' ty -- | pprTrace "repType'" (ppr ty $$ ppr (go1 ty)) False = undefined
- | otherwise = go1 ty
- where
- go1 = go . repType
- go (TyConApp tc tys) = mkTyConApp tc (map repType' tys)
- go ty = ty
-
-
-- ToDo: this could be moved to the code generator, using splitTyConApp instead
-- of inspecting the type directly.
typePrimRep :: Type -> PrimRep
-- Should only be applied to *types*; hence the assert
isAlgType :: Type -> Bool
-isAlgType ty = case splitTyConApp_maybe ty of
- Just (tc, ty_args) -> ASSERT( ty_args `lengthIs` tyConArity tc )
- isAlgTyCon tc
- other -> False
+isAlgType ty
+ = case splitTyConApp_maybe ty of
+ Just (tc, ty_args) -> ASSERT( ty_args `lengthIs` tyConArity tc )
+ isAlgTyCon tc
+ _other -> False
+
+-- Should only be applied to *types*; hence the assert
+isClosedAlgType :: Type -> Bool
+isClosedAlgType ty
+ = case splitTyConApp_maybe ty of
+ Just (tc, ty_args) -> ASSERT( ty_args `lengthIs` tyConArity tc )
+ isAlgTyCon tc && not (isOpenTyCon tc)
+ _other -> False
\end{code}
@isStrictType@ computes whether an argument (or let RHS) should
\begin{code}
tcPartOfType :: Type -> Type -> Bool
-tcPartOfType t1 t2 = tcEqType t1 t2
+tcPartOfType t1 t2
+ | tcEqType t1 t2 = True
tcPartOfType t1 t2
| Just t2' <- tcView t2 = tcPartOfType t1 t2'
+tcPartOfType _ (TyVarTy _) = False
tcPartOfType t1 (ForAllTy _ t2) = tcPartOfType t1 t2
tcPartOfType t1 (AppTy s2 t2) = tcPartOfType t1 s2 || tcPartOfType t1 t2
tcPartOfType t1 (FunTy s2 t2) = tcPartOfType t1 s2 || tcPartOfType t1 t2