The arguments are:

on/off / inherit

if @on, a trace-point is set on this object. If @off, this object is not traced. If @default, the value if the trace point is inherited. For normal objects the trace-flags will be inherited from the class. For classes it will be inherited from the super-class.

port(s)

The following ports or combinations of ports are defined:

full	Trace all ports (enter, exit and fail)
enter	Only trace entry
exit	Only trace successful completion
fail	Only trace completion with failure

Condition

When present, this code object will be executed if the other conditions are met. If this code object returns success the trace-point will be printed. The arguments are:

@receiver	Receiver of the action
@selector	Selector of the action
@arg1 ...	The arguments.

See also

program_object->break