Integrated: 8292657: Calling GetLocalXXX from virtual thread with thread parameter set to NULL returns carrier locals

[Serguei Spitsyn]

On Fri, 26 Aug 2022 20:13:28 GMT, Serguei Spitsyn <sspitsyn at openjdk.org> wrote:

> If JVM TI GetLocalXXX/SetLocalXXX is called from a virtual thread with the thread parameter set to NULL (meaning current thread) then it should get/set the value of the locals in the virtual thread frames. Instead, it reads the carrier thread locals and/or crashes.
> 
> The fix is that the relevant checking of the jthread parameter for NULL and adjusting it to current thread is added.
> It is done in new utility `function current_thread_obj_or_resolve_external_guard(jthread thread)`. For more convenient testing the same adjustment is done in the JVM TI extension function `GetCarrierThread()`.
> 
> The test serviceability/jvmti/vthread/GetSetLocalTest is updated to add previously missed test coverage.
> 
> The test serviceability/jvmti/vthread/VThreadTest has been updated to adopt to update behavior of the `GetCarrierThread`.
> 
> The fix was verified with the test/hotspot/jtreg/serviceability/jvmti/vthread/ tests.
> 
> The fix was also tested with the existing JVM TI and JDI tests to make sure no regressions are introduced.

This pull request has now been integrated.

Changeset: f5ebbf32
Author:    Serguei Spitsyn <sspitsyn at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/f5ebbf3225fc10367ef4e2b4ec62e9077565e6aa
Stats:     39 lines in 6 files changed: 24 ins; 2 del; 13 mod

8292657: Calling GetLocalXXX from virtual thread with thread parameter set to NULL returns carrier locals

Reviewed-by: cjplummer, alanb

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PR: https://git.openjdk.org/jdk/pull/10051