RFR: 8303040: linux PPC64le: Implementation of Foreign Function & Memory API (Preview) [v3]

[Martin Doerr]

On Sat, 11 Mar 2023 02:20:31 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> @JornVernee: Thanks! I've merged in your changes. TestArrayStructs is not yet completely working. I will need to investigate. I think I've done most other things you had requested. You may want to take a look at my recent commits.
>
> @TheRealMDoerr I've been keeping up with the changes you're making. I just have to look at the new test for HFA's you've added you added (next week).
> 
> Besides fixing the TestArrayStructs test, do you have anything else you still want to add to this PR?

@JornVernee: I guess I should add a couple of Upcalls to my new test. Otherwise, I have only planned to fix `TestArrayStructs`. Further changes (and maybe new tests) can still get done when working on Big Endian / AIX or when there is a demand.

I'm currently wondering about the `TestArrayStructs` failures. Passing arrays with up to 7 elements seems to work fine. When I pass 8 elements, the last element of `capturedArgs` gets observed as 0. When I pass more than 8 elements, element 5 and 6 of `capturedArgs` get observed as 0.
`DowncallLinker.invokeInterpBindings` has the correct `args`, but `UpcallLinker.invokeInterpBindings` doesn't receive the correct values as `lowLevelArgs`. They contain the wrong zeros. The remaining elements look correct.
Do you have an idea what could be going wrong? Otherwise, I'll have to continue debugging.

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PR: https://git.openjdk.org/jdk/pull/12708