RFR (XS): 8225141: Better handling of classes in error state in fast class initialization checks
vladimir.x.ivanov at oracle.com
Fri May 31 20:53:35 UTC 2019
Fast class initialization checks don't properly handle classes in error
state when performed from (previously) initializing thread.
One way to fix it is to add one more fast path check
(InstanceKlass::_init_state == being_initialized) into the barrier, but
that would require significant changes, since both newly introduced
checks (JDK-8223213 ) and existing C1 checks should be changed.
What I propose is to set InstanceKlass::_init_thread only for the
duration when the klass is in being_initialized state and reset it back
to NULL when changing class state. It makes existing "_init_thread ==
current_thread" check equivalent to "_init_state == being_initialized &&
_init_thread == current_thread".
Testing: hs-precheckin-comp, tier1-4
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