diff --git a/nac3artiq/demo.py b/nac3artiq/demo.py
index 8e9411f..9410b6f 100644
--- a/nac3artiq/demo.py
+++ b/nac3artiq/demo.py
@@ -63,4 +63,4 @@ class Demo:
 
 
 if __name__ == "__main__":
-    Demo().run()
+    run_on_core(Demo().run)
diff --git a/nac3artiq/demo_host_obj.py b/nac3artiq/demo_host_obj.py
new file mode 100644
index 0000000..b9916d0
--- /dev/null
+++ b/nac3artiq/demo_host_obj.py
@@ -0,0 +1,43 @@
+from language import *
+from artiq_builtins import *
+from numpy import int32, int64
+
+test_int = 123
+test_float = 123.456
+test_list = [1] * 1
+test_list2 = [[1.1], [], [3.0]]
+test_list_fail = [1, 2, 3.0]
+
+test_tuple = (1, 2, 3.0)
+
+@kernel
+class Test:
+    a: int32
+
+    @kernel
+    def __init__(self, a: int32):
+        self.a = a
+
+test = Test(1)
+print(test.a)
+
+@kernel
+class Demo:
+    @kernel
+    def run(self):
+        while True:
+            delay_mu(round64(test_float * 2.0))
+            delay_mu(int64(test_int))
+            delay_mu(int64(test_list[0]))
+            # delay_mu(int64(test_list_fail[0]))
+            delay_mu(int64(test_tuple[0]))
+            delay_mu(int64(test_tuple[2]))
+            delay_mu(int64(test_list2[2][0]))
+
+            delay_mu(int64(test.a))
+            test.a = 10
+            delay_mu(int64(test.a))
+
+
+if __name__ == "__main__":
+    run_on_core(Demo().run)
diff --git a/nac3artiq/language.py b/nac3artiq/language.py
index 73c79df..c479e75 100644
--- a/nac3artiq/language.py
+++ b/nac3artiq/language.py
@@ -1,12 +1,13 @@
 from inspect import isclass, getmodule
 from functools import wraps
+import sys
 
 import nac3artiq
 
 import device_db
 
 
-__all__ = ["extern", "kernel"]
+__all__ = ["extern", "kernel", "run_on_core"]
 
 
 nac3 = nac3artiq.NAC3(device_db.device_db["core"]["arguments"]["target"])
@@ -35,14 +36,15 @@ def kernel(class_or_function):
         nac3.register_module(module)
         registered_ids.add(module_id)
 
-    if isclass(class_or_function):
-        return class_or_function
-    else:
-        @wraps(class_or_function)
-        def run_on_core(self, *args, **kwargs):
-            global allow_module_registration
-            if allow_module_registration:
-                nac3.analyze()
-                allow_module_registration = False
-            nac3.compile_method(id(self.__class__), class_or_function.__name__)
-        return run_on_core
+    return class_or_function
+
+def get_defined_class(method):
+    return vars(sys.modules[method.__module__])[method.__qualname__.split('.')[0]]
+
+def run_on_core(method, *args, **kwargs):
+    global allow_module_registration
+    if allow_module_registration:
+        nac3.analyze()
+        allow_module_registration = False
+    nac3.compile_method(id(get_defined_class(method)), method.__name__)
+