RFR: 8283689: Update the foreign linker VM implementation [v7]

[David Holmes]

On Wed, 11 May 2022 20:27:42 GMT, Patricio Chilano Mateo <pchilanomate at openjdk.org> wrote:

>> I went ahead and implemented this suggestion. Now we block async exceptions in on_entry, and unblock in on_exit.
>
> Is it possible for these upcalls to be nested? If yes, we could add a boolean to context to avoid unsetting the flag in those nested cases. And now that I think we should probably add that check in NoAsyncExceptionDeliveryMark too if we allow broader use of this flag. David added the NoAsyncExceptionDeliveryMark code with that assert about nesting so maybe he might have more insights about that.

NoAsyncExceptionDeliveryMark is not for general use! There is no provision for blocking async exceptions when running user-defined Java code. NoAsyncExceptionDeliveryMark was purely for protecting "system Java code".

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PR: https://git.openjdk.java.net/jdk/pull/7959