Integrated: 8309400: JDI spec needs to clarify when OpaqueFrameException and NativeMethodException are thrown

[Chris Plummer]

On Tue, 15 Jul 2025 22:07:40 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> Fix how ThreadReference.popFrame() and ThreadReference.forceEarlyReturn deal with JDWP OPAQUE_FRAME error.
> 
> Before virtual threads, OpaqueFrameException did not exist and these API always threw NativeMethodException when JDWP OPAQUE_FRAME error was returned. For virtual threads OpaqueFrameException was added to handle the case where a virtual thread was not suspended at an event, so the JDI implementation was updated to throw OpaqueFrameException if it detected that a native method was not the cause. It turns out however that JVMTI (and therefore JDWP) can return OPAQUE_FRAME error for reasons other than a native method or the special virtual thread case, and for platform threads we were incorrectly throwing NativeMethodException in these cases. This PR fixes that. For platform threads we now only throw NativeMethodException if a native method is detected, and otherwise throw OpaqueFrameException.
> 
> The spec language is also being cleaned up to better align with JVMTI. Rather than calling out all the reasons for OpaqueFrameException, a more generic explanation is given.
> 
> This is somewhat of a preliminary PR so I can get some feedback. I still need to do a CSR and complete testing.

This pull request has now been integrated.

Changeset: 9041f4c4
Author:    Chris Plummer <cjplummer at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/9041f4c47f3c9b90abe825f652f572351060c96a
Stats:     35 lines in 3 files changed: 5 ins; 10 del; 20 mod

8309400: JDI spec needs to clarify when OpaqueFrameException and NativeMethodException are thrown

Reviewed-by: sspitsyn, alanb, amenkov

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PR: https://git.openjdk.org/jdk/pull/26335