+ embed_tc <- builtin embedTyCon
+ embed_dc <- builtin embedDataCon
+ cross_tc <- builtin crossTyCon
+ cross_dc <- builtin crossDataCon
+ plus_tc <- builtin plusTyCon
+ left_dc <- builtin leftDataCon
+ right_dc <- builtin rightDataCon
+
+ let mk_embed (expr, ty, pa)
+ = (mkConApp embed_dc [Type ty, pa, expr],
+ mkTyConApp embed_tc [ty])
+
+ mk_cross (expr1, ty1) (expr2, ty2)
+ = (mkConApp cross_dc [Type ty1, Type ty2, expr1, expr2],
+ mkTyConApp cross_tc [ty1, ty2])
+
+ mk_tup [] = (Var unitDataConId, unitTy)
+ mk_tup es = foldr1 mk_cross es
+
+ mk_sum [] = ([Var unitDataConId], unitTy)
+ mk_sum [(expr, ty)] = ([expr], ty)
+ mk_sum ((expr, lty) : es)
+ = let (alts, rty) = mk_sum es
+ in
+ (mkConApp left_dc [Type lty, Type rty, expr]
+ : [mkConApp right_dc [Type lty, Type rty, alt] | alt <- alts],
+ mkTyConApp plus_tc [lty, rty])
+
+ liftM (mk_sum . map (mk_tup . map mk_embed))
+ (mapM (mapM init) ess)
+ where
+ init expr = let ty = exprType expr
+ in do
+ pa <- paDictOfType ty
+ return (expr, ty, pa)
+
+mkClosureType :: Type -> Type -> VM Type
+mkClosureType arg_ty res_ty = mkBuiltinTyConApp closureTyCon [arg_ty, res_ty]
+
+mkClosureTypes :: [Type] -> Type -> VM Type
+mkClosureTypes = mkBuiltinTyConApps closureTyCon
+
+mkPADictType :: Type -> VM Type
+mkPADictType ty = mkBuiltinTyConApp paTyCon [ty]