Add _handle_none_return

pythonbpf/functions/return_utils.py

@@ -0,0 +1,11 @@
+import logging
+import ir
+
+logger: logging.Logger = logging.getLogger(__name__)
+
+
+def _handle_none_return(builder) -> bool:
+    """Handle return or return None -> returns 0."""
+    builder.ret(ir.Constant(ir.IntType(64), 0))
+    logger.debug("Generated default return: 0")
+    return True