Appendix C P4 reserved annotations

The following table shows all P4 reserved annotations.

Annotation	Purpose	See Section
atomic	specify atomic execution	Concurrency model
defaultonly	action can only appear in the default action	Annotations on the table action list
hidden	hides a controllable entity from the control plane	Annotations controlling naming
match	specify match_kind of a field in a value_set	Value set annotations
name	assign local control-plane name	Annotations controlling naming
optional	parameter is optional	Optional parameter annotations
tableonly	action cannot be a default_action	Annotations on the table action list
deprecated	Construct has been deprecated	Deprecated annotation
pure	pure function	Extern function/method annotations
noSideEffects	function with no side effects	Extern function/method annotations
noWarn	Has a string argument; inhibits compiler warnings	No warnings annotation