On Tue, 24 May 2022 22:31:16 GMT, Alex Menkov <[email protected]> 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
