trace_synth_field
union trace_synth_field fields[];
int size, union trace_synth_field *val, char *space)
union trace_synth_field *data = &entry->fields[n_u64];
union trace_synth_field *data = &entry->fields[n_u64];
union trace_synth_field *data = &entry->fields[*n_u64];
union trace_synth_field *data = &entry->fields[*n_u64];