Integrated: 8308819: add JDWP and JDI virtual thread support for ThreadReference.ForceEarlyReturn

[Chris Plummer]

On Fri, 26 May 2023 03:21:12 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> Improve ThreadReference.ForceEarlyReturn to support virtual threads as long as they are suspended and mounted.
> 
> [JDK-8308400](https://bugs.openjdk.org/browse/JDK-8308400) improved JVMTI ForceEarlyReturn support for virtual threads. The spec now says it is supported if the thread is suspended at an event (not a specific event as previously spec'd), and additional support may also be provided. The implementation now just requires that the virtual thread be mounted, so this covers being suspended at an event, but also other situations in which the virtual thread is mounted.
> 
> JDWP and JDI need to line up with JVMTI. Only spec changes will be needed.
> 
> A new test was added mostly to cover the unmounted virtual thread case that results in OpaqueFrameException.
> 
> forceEarlyReturn002 test had previously been updated for virtual threads to expect OpaqueFrameException. These changes have all been undone since the test now runs the same when using virtual threads as with platform threads.

This pull request has now been integrated.

Changeset: 5531f6ba
Author:    Chris Plummer <cjplummer at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/5531f6ba1b75f922f08501eda4b2a7a849ee49f5
Stats:     351 lines in 9 files changed: 302 ins; 29 del; 20 mod

8308819: add JDWP and JDI virtual thread support for ThreadReference.ForceEarlyReturn

Reviewed-by: sspitsyn, alanb

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PR: https://git.openjdk.org/jdk/pull/14167