
<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Hi all,</div><div dir="ltr"><br></div><div dir="ltr">Congratulations to all!!! Finally!!!</div><div dir="ltr"><br><div dir="ltr"></div><blockquote type="cite">On 27 Jul 2023, at 18:22, Gavin Ray <ray.gavin97@gmail.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div dir="ltr">Amazing, congrats to all involved!<div><br></div><div>What are the odds that "RecordMapper" and "Improve ability to visualize MemorySegments" will be available in the stable release?</div><div><br></div><div><div><a href="https://github.com/openjdk/panama-foreign/pull/833">https://github.com/openjdk/panama-foreign/pull/833</a></div><div><a href="https://github.com/openjdk/panama-foreign/pull/695">https://github.com/openjdk/panama-foreign/pull/695</a></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jul 27, 2023 at 10:25 AM Chris Vest <<a href="mailto:mr.chrisvest@gmail.com">mr.chrisvest@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">This is excellent news.<div>Congratulations to the team on the big milestone!</div><div><br></div><div>Chris</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jul 27, 2023 at 6:58 AM Maurizio Cimadamore <<a href="mailto:maurizio.cimadamore@oracle.com" target="_blank">maurizio.cimadamore@oracle.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi all,<br>

As you know, the FFM API has been a Preview API since Java 19 [1]. The <br>

API was then re-previewed in 20 [2] and 21 [3]. Some of enhancements <br>

delivered in this timeframe were:<br>

<br>

* Unification of memory segments and memory addresses [4]<br>

* Treat arenas as "capabilities", so that memory segments can be safely <br>

shared [5, 6]<br>

* Allow for custom arenas [5, 6]<br>

* Add ways to customize linkage requests [7]<br>

* Add fallback linker, to facilitate porting FFM API to all platforms [8]<br>

<br>

We now believe that the FFM API is largely stable, and that, modulo <br>

disasters :-), it should exit preview in the next Java SE release:<br>

<br>

<a href="https://openjdk.org/jeps/8310626" rel="noreferrer" target="_blank">https://openjdk.org/jeps/8310626</a><br>

<br>

We have already started accumulating some changes in the panama <br>

repository which aim at polishing some minor edges in the API:<br>

<br>

* Add better support for "wide" native strings [9]<br>

* Make var handles derived from layouts more composable [10]<br>

* Add a linker method that can be used to discover platform-dependent <br>

mapping between C types and layouts [11]<br>

<br>

These changes are fairly minor, and should not have a big impact (if any <br>

at all) on existing code using the FFM API.<br>

<br>

Of course, the fact that FFM API is headed for finalization doesn't mean <br>

that development on FFM API will stop. There are several enhancements <br>

(aside from "regular" performance fixes) that we have been discussing <br>

over the years which can be delivered as follow-up JEPs:<br>

<br>

* Support for unsigned/complex types (needs Valhalla)<br>

* Mapping between structs and records [12]<br>

* Integration between Linker and JNI [13]<br>

* Structured arenas (depends on finalization of StructuredTaskScope) [14]<br>

* Pinning of heap segments<br>

<br>

(Of course, we have made sure that all the above enhancement can be <br>

delivered in an additive fashion, e.g. without the need to make <br>

incompatible changes to the FFM API)<br>

<br>

Finally, we'd like to thank all the developers who, over the years, have <br>

taken the time to take the API for a spin, try to build something with <br>

it and report feedback. This has been a long journey, and we wouldn't be <br>

where we are now without your help.<br>

<br>

Cheers<br>

Maurizio<br>

<br>

[1] - <a href="https://openjdk.org/jeps/424" rel="noreferrer" target="_blank">https://openjdk.org/jeps/424</a><br>

[2] - <a href="https://openjdk.org/jeps/434" rel="noreferrer" target="_blank">https://openjdk.org/jeps/434</a><br>

[3] - <a href="https://openjdk.org/jeps/442" rel="noreferrer" target="_blank">https://openjdk.org/jeps/442</a><br>

[4] - <a href="https://cr.openjdk.org/~mcimadamore/panama/segment_address.html" rel="noreferrer" target="_blank">https://cr.openjdk.org/~mcimadamore/panama/segment_address.html</a><br>

[5] - <a href="https://cr.openjdk.org/~mcimadamore/panama/session_arenas.html" rel="noreferrer" target="_blank">https://cr.openjdk.org/~mcimadamore/panama/session_arenas.html</a><br>

[6] - <a href="https://cr.openjdk.org/~mcimadamore/panama/scoped_arenas.html" rel="noreferrer" target="_blank">https://cr.openjdk.org/~mcimadamore/panama/scoped_arenas.html</a><br>

[7] - <a href="https://git.openjdk.org/panama-foreign/pull/734" rel="noreferrer" target="_blank">https://git.openjdk.org/panama-foreign/pull/734</a><br>

[8] - <a href="https://git.openjdk.org/panama-foreign/pull/770" rel="noreferrer" target="_blank">https://git.openjdk.org/panama-foreign/pull/770</a><br>

[9] - <a href="https://git.openjdk.org/panama-foreign/pull/836" rel="noreferrer" target="_blank">https://git.openjdk.org/panama-foreign/pull/836</a><br>

[10] - <a href="https://github.com/openjdk/panama-foreign/pull/840" rel="noreferrer" target="_blank">https://github.com/openjdk/panama-foreign/pull/840</a><br>

[11] - <a href="https://git.openjdk.org/panama-foreign/pull/839" rel="noreferrer" target="_blank">https://git.openjdk.org/panama-foreign/pull/839</a><br>

[12] - <a href="https://github.com/openjdk/panama-foreign/pull/833" rel="noreferrer" target="_blank">https://github.com/openjdk/panama-foreign/pull/833</a><br>

[13] - <a href="https://mail.openjdk.org/pipermail/panama-dev/2023-May/019079.html" rel="noreferrer" target="_blank">https://mail.openjdk.org/pipermail/panama-dev/2023-May/019079.html</a><br>

[14] - <a href="https://cr.openjdk.org/~mcimadamore/panama/session_arenas.html" rel="noreferrer" target="_blank">https://cr.openjdk.org/~mcimadamore/panama/session_arenas.html</a><br>

<br>

</blockquote></div>

</blockquote></div>

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