diff --git a/.gitignore b/.gitignore
index ea8c4bf..691f494 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
+__pycache__
 /target
diff --git a/nac3embedded/demo.py b/nac3embedded/demo.py
new file mode 100644
index 0000000..9264b96
--- /dev/null
+++ b/nac3embedded/demo.py
@@ -0,0 +1,11 @@
+from language import *
+
+
+class Demo:
+    @kernel
+    def run(self):
+        pass
+
+
+if __name__ == "__main__":
+    Demo().run()
diff --git a/nac3embedded/language.py b/nac3embedded/language.py
new file mode 100644
index 0000000..57e10d9
--- /dev/null
+++ b/nac3embedded/language.py
@@ -0,0 +1,17 @@
+from functools import wraps
+
+import nac3embedded
+
+
+__all__ = ["kernel", "portable"]
+
+
+def kernel(function):
+    @wraps(function)
+    def run_on_core(self, *args, **kwargs):
+        nac3embedded.add_host_object(self)
+    return run_on_core
+
+
+def portable(function):
+    return fn
diff --git a/nac3embedded/src/lib.rs b/nac3embedded/src/lib.rs
index c0e864d..213f15e 100644
--- a/nac3embedded/src/lib.rs
+++ b/nac3embedded/src/lib.rs
@@ -2,13 +2,20 @@ use pyo3::prelude::*;
 use pyo3::wrap_pyfunction;
 
 #[pyfunction]
-fn sum_as_string(a: usize, b: usize) -> PyResult<String> {
-    Ok((a + b).to_string())
+fn add_host_object(obj: PyObject) -> PyResult<()> {
+    Python::with_gil(|py| -> PyResult<()> {
+        let obj: &PyAny = obj.extract(py)?;
+        let inspect = PyModule::import(py, "inspect")?;
+        let source = inspect.call1("getsource", (obj.get_type(), ))?;
+        println!("source:\n{}", source);
+        Ok(())
+    })?;
+    Ok(())
 }
 
 #[pymodule]
-fn nac3embedded(py: Python, m: &PyModule) -> PyResult<()> {
-    m.add_function(wrap_pyfunction!(sum_as_string, m)?)?;
+fn nac3embedded(_py: Python, m: &PyModule) -> PyResult<()> {
+    m.add_function(wrap_pyfunction!(add_host_object, m)?)?;
 
     Ok(())
 }