[jdk18] RFR: 8262134: compiler/uncommontrap/TestDeoptOOM.java failed with "guarantee(false) failed: wrong number of expression stack elements during deopt"

[Dean Long]

On Fri, 10 Dec 2021 17:09:31 GMT, Igor Veresov <iveresov at openjdk.org> wrote:

>> C1 patching stubs use the Unpack_reexecute deoptimization type, but if an exception is thrown, that information is lost, causing the VerifyStack logic to fail. Rather than relaxing the VerifyStack logic to accept Unpack_exception in this case, this change sets the reexecute flag on the patch stub call site.
>> Other changes:
>> use runtime/BootstrapMethod/BSMCalledTwice.java as a reproducer
>> improve VerifyStack failure output
>
> Have you run tier7 where is it does -XX:DeoptimizeALot ?

@veresov, tier7 testing passed.

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PR: https://git.openjdk.java.net/jdk18/pull/7