RFR: 8288324: Loom: Uninitialized JvmtiEnvs in VM_Virtual* ops

[David Holmes]

On Tue, 14 Jun 2022 08:33:05 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> I'm confused by the comments above. The code failed to initialize the `_env` member but then makes calls via this uninitialized pointer! Surely we should have crashed?
>
>> I'm confused by the comments above. The code failed to initialize the `_env` member but then makes calls via this uninitialized pointer! Surely we should have crashed?
> 
> JvmtiEnvBase::get_frame_count is static and I think `((JvmtiEnvBase*)_env)->get_frame_count(_vthread_h(), _count_ptr);` is compiled to just call it and the not-initialised _env is not used.

Thanks @AlanBateman !

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PR: https://git.openjdk.org/jdk19/pull/10