tracer.go
func (t *BTTracer) AddOptions(options []string, v ...string) []string {
	if options != nil {
		return append(options, v...)
	}

	t.m.Lock()
	defer t.m.Unlock()

	t.options = append(t.options, v...)
	return nil
}
func (t *BTTracer) AddOptions(options []string, v ...string) []string {
	if options != nil {
		return append(options, v...)
	}

	t.m.Lock()
	defer t.m.Unlock()

	t.options = append(t.options, v...)
	return nil
}
// See bcd.Tracer.AddOptions().