DTRACEOPT_JSTACKFRAMES
if (dtp->dt_options[DTRACEOPT_JSTACKFRAMES] != DTRACEOPT_UNSET)
nframes = dtp->dt_options[DTRACEOPT_JSTACKFRAMES];
{ "jstackframes", dt_opt_runtime, DTRACEOPT_JSTACKFRAMES },
nframes = opt[DTRACEOPT_JSTACKFRAMES];
opt[DTRACEOPT_JSTACKFRAMES] = dtrace_jstackframes_default;