RFR: 8338745: Intrinsify Continuation.pin() and Continuation.unpin()

[Markus Grönlund]

On Thu, 22 Aug 2024 09:11:03 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> The functional requirement I have is that the branch takes an uncommon trap and restarts / re-executes the same method the interpreter, because that version enters the VM where an IllegalStateException is thrown. 
>> 
>> I don't need the compiled method to be invalidated, only that an attempt that over/underflows (thread-local) restarts in the interpeter for the exception to be thrown. Is Action_none better suited for this purpose?
>
> The pattern of the uncommon trap construct was taken from the precedent in LibraryCallKit::inline_profileBoolean().

Is it an implicit invariant that execution always continues in the interpreter after an uncommon trap? I.e., I don't need to explicitly tell it to "re-execute" there?

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PR Review Comment: https://git.openjdk.org/jdk/pull/20664#discussion_r1726689737