On Tue, 24 May 2022 22:31:16 GMT, Alex Menkov <amen...@openjdk.org> wrote:
>> src/hotspot/share/prims/jvmtiEventController.cpp line 775: >> >>> 773: env->set_event_callbacks(callbacks, size_of_callbacks); >>> 774: // Mask to clear normal event bits. >>> 775: const jlong CLEARING_MASK = (1L >> (JVMTI_MIN_EVENT_TYPE_VAL - >>> TOTAL_MIN_EVENT_TYPE_VAL)) - 1L; >> >> I don't follow how this works.. >> Should it be "<<" instead of ">>" ? > > Maybe it would be clearer to turn off the bits when there are no events: > > jlong enabled_bits = > env->env_event_enable()->_event_callback_enabled.get_bits(); > for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; > ++ei) { > jvmtiEvent evt_t = (jvmtiEvent)ei; > if (!env->has_callback(evt_t)) { > // clear the bit if there is no callback > enabled_bits &= ~JvmtiEventEnabled::bit_for(evt_t); > } > } Thanks, Alex! You are right - fixed. I was stupid enough to confuse the direction. Minimal tracing helps in such cases. ------------- PR: https://git.openjdk.java.net/jdk/pull/8860