RFR: 8303040: linux PPC64le: Implementation of Foreign Function & Memory API (Preview) [v2]

[Martin Doerr]

On Wed, 22 Feb 2023 18:23:54 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Clean fix for NativeMemorySegmentImpl issue with byteSize 0.
>
> src/java.base/share/classes/jdk/internal/foreign/PlatformLayouts.java line 266:
> 
>> 264:          * The {@code T*} native type.
>> 265:          */
>> 266:         public static final ValueLayout.OfAddress C_POINTER = ValueLayout.ADDRESS.withBitAlignment(64);
> 
> I think this is where the issue with the check in `MemorySegment::copy` comes from. Note how other platforms add a call to `asUnbounded` for the created layout, which makes any pointer boxed using this layout writable/readable (such as the in memory return pointer for upcalls).

Thanks for the hint! You found it pretty quickly. I had missed that when rebasing my early prototype. Fixed.

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