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<p style="margin: 0px 0px 1.2em !important;">Hi Duncan,<br>
we took a better look at this, and noticed that, in reality,
there’s not much we can do at the moment about this, for two
reasons.</p>
<p style="margin: 0px 0px 1.2em !important;">First, the idea
behind your approach was to move some of this shared
functionality (such as the “allocate” method) to the Upcall
class. But this changes the client code in ways that IMHO are
not optimal — e.g.</p>
<pre style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;font-size: 1em; line-height: 1.2em;margin: 1.2em 0px;"><code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;white-space: pre; overflow: auto; border-radius: 3px; border: 1px solid rgb(204, 204, 204); padding: 0.5em 0.7em; display: block !important;">compar.allocate(...)
</code></pre>
<p style="margin: 0px 0px 1.2em !important;">becomes</p>
<pre style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;font-size: 1em; line-height: 1.2em;margin: 1.2em 0px;"><code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;white-space: pre; overflow: auto; border-radius: 3px; border: 1px solid rgb(204, 204, 204); padding: 0.5em 0.7em; display: block !important;">compar$func.UPCALL.allocate(...)
</code></pre>
<p style="margin: 0px 0px 1.2em !important;">So I think that, to
make this work, we would have to replicate the <code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;">allocate</code>
method (and possibly other accessors) in the toplevel class —
which reduces the gain.</p>
<p style="margin: 0px 0px 1.2em !important;">A better strategy
would be one where the toplevel class “extends” from Upcall —
then all the various methods would be inherited — and clients
would be good again. But if we do that, we lose “constant-ness”
of the various method handles involved, which will make methods
like “invoke” slower.</p>
<p style="margin: 0px 0px 1.2em !important;">Another difference
between the two approaches is that you have merged the
functional pointer wrapper with the functional interface. This
is a move we have considered when we transitioned to this new
code generation strategy, but we ended up rejecting because
there’s no way to make interface fields non-public. Which is why
we opted for an enclosing <em>class</em> with a nested
interface.</p>
<p style="margin: 0px 0px 1.2em !important;">For these reasons, I
believe that, for the time being, it’s better to keep the
generated code as is. It is possible that the StableValue API
[1] will allow us to change this — at some point we considered
making fields of type StableValue implicitly trusted finals.
While we have removed that trick in the current PR, something
like that might allow for the code generation strategy I was
alluding to earlier — where the function pointer class extends
from some Upcall class that has a pair of stable value fields,
one for the upcall MH, the other for the downcall MH. (In
general, we’re confident that StableValue should result in
jextract bindings become much more compact, as SV will
essentially remove the need for all the holder classes that are
spread throughout the generated code).</p>
<p style="margin: 0px 0px 1.2em !important;">Thanks for the
exploration!<br>
Maurizio</p>
<p style="margin: 0px 0px 1.2em !important;">[1] - <a href="https://github.com/openjdk/jdk/pull/23972" class="moz-txt-link-freetext">https://github.com/openjdk/jdk/pull/23972</a></p>
<p style="margin: 0px 0px 1.2em !important;">On 07/04/2025 16:09,
Maurizio Cimadamore wrote:</p>
<p style="margin: 0px 0px 1.2em !important;"></p>
<div class="markdown-here-exclude">
<p></p>
<blockquote type="cite" cite="mid:140344b9-5401-42be-b647-164fa3e2f7a4@oracle.com">
<p>I like this. The use of record components should probably
preserve the fact that the upcall method handle is treated
as a constant.</p>
<p>This seems related to this PR under review:</p>
<p><a class="moz-txt-link-freetext" href="https://git.openjdk.org/jextract/pull/279" moz-do-not-send="true">https://git.openjdk.org/jextract/pull/279</a></p>
<p>So we should make sure to decide what code we want to
generate (as that PR will make function pointer support even
more verbose).</p>
<p>Cheers<br>
Maurizio<br>
</p>
<div class="moz-cite-prefix">On 07/04/2025 13:42, Duncan
Gittins wrote:<br>
</div>
<blockquote type="cite" cite="mid:CABOqcFs0fbhtVR9-+U5pN6E2Gwo3WyA81q=T=XPFGpp2GaLJJA@mail.gmail.com">
<div dir="ltr">
<div>I've been using jextract successfully for some time
now and it has made it very easy to call into various
Windows. Great work.</div>
<div><br>
</div>
<div>One area which seems a bit verbose is the handling of
the functional interface callbacks for upcalls. For
example, the qsort compare callback is as follows (I've
shortened the jextract version here):</div>
<div><br>
</div>
<div>
<div style="background-color:rgb(255,255,255);padding:0px 0px 0px 2px">
<div style="color:rgb(0,0,0);background-color:rgb(255,255,255);font-family:"Consolas";font-size:10pt;white-space:pre"><p style="margin:0px"><span style="color:rgb(127,0,85);font-weight:bold">public</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">class</span><span style="color:rgb(0,0,0)"> QsortCompareFunc {</span></p><p style="margin:0px">
</p><p style="margin:0px"><span style="color:rgb(0,0,0)"> QsortCompareFunc() { }</span></p><p style="margin:0px">
</p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(63,95,191)">/** The function pointer signature, expressed as a functional interface */</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">public</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">interface</span><span style="color:rgb(0,0,0)"> Function {</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">int</span><span style="color:rgb(0,0,0)"> apply(MemorySegment </span><span style="color:rgb(106,62,62)">_x0</span><span style="color:rgb(0,0,0)">, MemorySegment </span><span style="color:rgb(106,62,62)">_x1</span><span style="color:rgb(0,0,0)">);</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> }</span></p><p style="margin:0px">
</p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">private</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">static</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">final</span><span style="color:rgb(0,0,0)"> FunctionDescriptor </span><span style="color:rgb(0,0,192);font-style:italic;font-weight:bold">$DESC</span><span style="color:rgb(0,0,0)"> = FunctionDescriptor.</span><span style="color:rgb(0,0,0);font-style:italic">of</span><span style="color:rgb(0,0,0)">(</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> C_h.C_INT,</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> C_h.C_POINTER,</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> C_h.C_POINTER</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> );</span></p><p style="margin:0px">
</p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(63,95,191)">/** The descriptor of this function pointer */</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">public</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">static</span><span style="color:rgb(0,0,0)"> FunctionDescriptor descriptor() {</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">return</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(0,0,192);font-style:italic;font-weight:bold">$DESC</span><span style="color:rgb(0,0,0)">;</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> }</span></p><p style="margin:0px">
</p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">private</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">static</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">final</span><span style="color:rgb(0,0,0)"> MethodHandle </span><span style="color:rgb(0,0,192);font-style:italic;font-weight:bold">UP$MH</span><span style="color:rgb(0,0,0)"> = C_h.upcallHandle(QsortCompareFunc.Function.</span><span style="color:rgb(127,0,85);font-weight:bold">class</span><span style="color:rgb(0,0,0)">, </span><span style="color:rgb(42,0,255)">"apply"</span><span style="color:rgb(0,0,0)">, </span><span style="color:rgb(0,0,192);font-style:italic;font-weight:bold">$DESC</span><span style="color:rgb(0,0,0)">);</span></p><p style="margin:0px">
</p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(63,95,191)">/**</span></p><p style="margin:0px"><span style="color:rgb(63,95,191)"> * Allocates a new upcall stub, whose implementation is defined by {@code fi}.</span></p><p style="margin:0px"><span style="color:rgb(63,95,191)"> * The lifetime of the returned segment is managed by {@code arena}</span></p><p style="margin:0px"><span style="color:rgb(63,95,191)"> */</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">public</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">static</span><span style="color:rgb(0,0,0)"> MemorySegment allocate(QsortCompareFunc.Function </span><span style="color:rgb(106,62,62)">fi</span><span style="color:rgb(0,0,0)">, Arena </span><span style="color:rgb(106,62,62)">arena</span><span style="color:rgb(0,0,0)">) {</span></p><p style="margin
:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">return</span><span style="color:rgb(0,0,0)"> Linker.</span><span style="color:rgb(0,0,0);font-style:italic">nativeLinker</span><span style="color:rgb(0,0,0)">().upcallStub(</span><span style="color:rgb(0,0,192);font-style:italic;font-weight:bold">UP$MH</span><span style="color:rgb(0,0,0)">.bindTo(</span><span style="color:rgb(106,62,62)">fi</span><span style="color:rgb(0,0,0)">), </span><span style="color:rgb(0,0,192);font-style:italic;font-weight:bold">$DESC</span><span style="color:rgb(0,0,0)">, </span><span style="color:rgb(106,62,62)">arena</span><span style="color:rgb(0,0,0)">);</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> }</span></p><p style="margin:0px">
</p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">private</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">static</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">final</span><span style="color:rgb(0,0,0)"> MethodHandle </span><span style="color:rgb(0,0,192);font-style:italic;font-weight:bold">DOWN$MH</span><span style="color:rgb(0,0,0)"> = Linker.</span><span style="color:rgb(0,0,0);font-style:italic">nativeLinker</span><span style="color:rgb(0,0,0)">().downcallHandle(</span><span style="color:rgb(0,0,192);font-style:italic;font-weight:bold">$DESC</span><span style="color:rgb(0,0,0)">);</span></p><p style="margin:0px">
</p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(63,95,191)">/**</span></p><p style="margin:0px"><span style="color:rgb(63,95,191)"> * Invoke the upcall stub {@code funcPtr}, with given parameters</span></p><p style="margin:0px"><span style="color:rgb(63,95,191)"> */</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">public</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">static</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">int</span><span style="color:rgb(0,0,0)"> invoke(MemorySegment </span><span style="color:rgb(106,62,62)">funcPtr</span><span style="color:rgb(0,0,0)">,MemorySegment </span><span style="color:rgb(106,62,62)">_x0</span><span style="color:rgb(0,0,0)">, MemorySegment </span><span style="color:rgb(106,62,62)">_x1</span><span style="color:rgb(0,0,0)">)
{</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">try</span><span style="color:rgb(0,0,0)"> {</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">return</span><span style="color:rgb(0,0,0)"> (</span><span style="color:rgb(127,0,85);font-weight:bold">int</span><span style="color:rgb(0,0,0)">) </span><span style="color:rgb(0,0,192);font-style:italic;font-weight:bold">DOWN$MH</span><span style="color:rgb(0,0,0)">.invokeExact(</span><span style="color:rgb(106,62,62)">funcPtr</span><span style="color:rgb(0,0,0)">, </span><span style="color:rgb(106,62,62)">_x0</span><span style="color:rgb(0,0,0)">, </span><span style="color:rgb(106,62,62)">_x1</span><span style="color:rgb(0,0,0)">);</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> } </span><span style="color:rgb(127,0,85);font-weight:bold">catch</span><span style="color:rgb(0,0,0)"> (Throwable </span><span style="color:rgb(106,62,62)">ex$</span><span style="color:rgb(0,0,0)">) {</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">throw</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">new</span><span style="color:rgb(0,0,0)"> AssertionError(</span><span style="color:rgb(42,0,255)">"should not reach here"</span><span style="color:rgb(0,0,0)">, </span><span style="color:rgb(106,62,62)">ex$</span><span style="color:rgb(0,0,0)">);</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> }</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> }</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)">}</span></p></div>
</div>
</div>
<div><br>
</div>
<div>I made a few changes in jextract to make the
callbacks generate interface rather than a class, adding
a helper record Upcall to do most of the actions:</div>
<div><br>
</div>
<div>
<div style="background-color:rgb(255,255,255);padding:0px 0px 0px 2px">
<div style="color:rgb(0,0,0);background-color:rgb(255,255,255);font-family:"Consolas";font-size:10pt;white-space:pre"><p style="margin:0px"><span style="color:rgb(127,0,85);font-weight:bold">public</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">interface</span><span style="color:rgb(0,0,0)"> QsortCompareFunc {</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(63,95,191)">/** The function pointer signature, expressed as a functional interface */</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">int</span><span style="color:rgb(0,0,0)"> apply(MemorySegment </span><span style="color:rgb(106,62,62)">_x0</span><span style="color:rgb(0,0,0)">, MemorySegment </span><span style="color:rgb(106,62,62)">_x1</span><span style="color:rgb(0,0,0)">);</span></p><p style="margin:0px">
</p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">static</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">final</span><span style="color:rgb(0,0,0)"> C_h.Upcall<QsortCompareFunc> </span><span style="color:rgb(0,0,192);font-style:italic;font-weight:bold">UPCALL</span><span style="color:rgb(0,0,0)"> = </span><span style="color:rgb(127,0,85);font-weight:bold">new</span><span style="color:rgb(0,0,0)"> C_h.Upcall<>(QsortCompareFunc.</span><span style="color:rgb(127,0,85);font-weight:bold">class</span><span style="color:rgb(0,0,0)">, </span><span style="color:rgb(42,0,255)">"apply"</span><span style="color:rgb(0,0,0)">, FunctionDescriptor.</span><span style="color:rgb(0,0,0);font-style:italic">of</span><span style="color:rgb(0,0,0)">(</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> C_h.</span><span style="color:rgb(0,0,192);font-st
yle:italic;font-weight:bold">C_INT</span><span style="color:rgb(0,0,0)">,</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> C_h.</span><span style="color:rgb(0,0,192);font-style:italic;font-weight:bold">C_POINTER</span><span style="color:rgb(0,0,0)">,</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> C_h.</span><span style="color:rgb(0,0,192);font-style:italic;font-weight:bold">C_POINTER</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> ));</span></p><p style="margin:0px">
</p><div style="background-color:rgb(255,255,255);padding:0px 0px 0px 2px"><div style="color:rgb(0,0,0);background-color:rgb(255,255,255);font-family:"Consolas";font-size:10pt;white-space:pre"><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(63,127,95)">// </span><span style="color:rgb(63,127,95)">A </span><span style="color:rgb(63,127,95)">new upcall stub </span><span style="color:rgb(63,127,95)">is </span><span style="background-color:rgb(255,255,255);padding:0px 0px 0px 2px"><span style="color:rgb(0,0,0);background-color:rgb(255,255,255);font-family:"Consolas";font-size:10pt;white-space:pre"><span style="color:rgb(63,127,95)">allocated </span></span></span><span style="color:rgb(63,127,95)">by</span>:</p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(63,127,95)">// MemorySegment funcPtr = QsortCompareFunc.UPCALL.allocate(fi,arena)</span></p><p style="margin:0px">
</p></div></div><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(63,95,191)">/**</span></p><p style="margin:0px"><span style="color:rgb(63,95,191)"> * Invoke the upcall stub {@code funcPtr}, with given parameters</span></p><p style="margin:0px"><span style="color:rgb(63,95,191)"> */</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">public</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">static</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">int</span><span style="color:rgb(0,0,0)"> invoke(MemorySegment </span><span style="color:rgb(106,62,62)">funcPtr</span><span style="color:rgb(0,0,0)">,MemorySegment </span><span style="color:rgb(106,62,62)">_x0</span><span style="color:rgb(0,0,0)">, MemorySegment </span><span style="color:rgb(106,62,62)">_x1</span><span style="color:rg
b(0,0,0)">) {</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">try</span><span style="color:rgb(0,0,0)"> {</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">return</span><span style="color:rgb(0,0,0)"> (</span><span style="color:rgb(127,0,85);font-weight:bold">int</span><span style="color:rgb(0,0,0)">) </span><span style="color:rgb(0,0,192);font-style:italic;font-weight:bold">UPCALL</span><span style="color:rgb(0,0,0)">.downcall().invokeExact(</span><span style="color:rgb(106,62,62)">funcPtr</span><span style="color:rgb(0,0,0)">, </span><span style="color:rgb(106,62,62)">_x0</span><span style="color:rgb(0,0,0)">, </span><span style="color:rgb(106,62,62)">_x1</span><span style="color:rgb(0,0,0)">);</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> } </span><span style="color:rgb(127,0,85);font-weight:bo
ld">catch</span><span style="color:rgb(0,0,0)"> (Throwable </span><span style="color:rgb(106,62,62)">ex$</span><span style="color:rgb(0,0,0)">) {</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">throw</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">new</span><span style="color:rgb(0,0,0)"> AssertionError(</span><span style="color:rgb(42,0,255)">"should not reach here"</span><span style="color:rgb(0,0,0)">, </span><span style="color:rgb(106,62,62)">ex$</span><span style="color:rgb(0,0,0)">);</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> }</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> }</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)">}</span></p></div>
</div>
<br>
</div>
<div>This reduces the definition somewhat, as long as the
top level header has a record to handle all callback
interfaces:</div>
<div><br>
</div>
<div>
<div style="background-color:rgb(255,255,255);padding:0px 0px 0px 2px">
<div style="color:rgb(0,0,0);background-color:rgb(255,255,255);font-family:"Consolas";font-size:10pt;white-space:pre"><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">public</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">record</span><span style="color:rgb(0,0,0)"> Upcall<FunctionInterface>(FunctionDescriptor </span><span style="color:rgb(106,62,62)">descriptor</span><span style="color:rgb(0,0,0)">, MethodHandle </span><span style="color:rgb(106,62,62)">upcall</span><span style="color:rgb(0,0,0)">, MethodHandle </span><span style="color:rgb(106,62,62)">downcall</span><span style="color:rgb(0,0,0)">) {</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">public</span><span style="color:rgb(0,0,0)"> Upcall(Class<FunctionInterface> </span><span style="color:rgb(106,
62,62)">fi</span><span style="color:rgb(0,0,0)">, String </span><span style="color:rgb(106,62,62)">name</span><span style="color:rgb(0,0,0)">, FunctionDescriptor </span><span style="color:rgb(106,62,62)">descriptor</span><span style="color:rgb(0,0,0)">) {</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">this</span><span style="color:rgb(0,0,0)">(</span><span style="color:rgb(106,62,62)">descriptor</span><span style="color:rgb(0,0,0)">, </span><span style="color:rgb(0,0,0);font-style:italic">upcallHandle</span><span style="color:rgb(0,0,0)">(</span><span style="color:rgb(106,62,62)">fi</span><span style="color:rgb(0,0,0)">, </span><span style="color:rgb(106,62,62)">name</span><span style="color:rgb(0,0,0)">, </span><span style="color:rgb(106,62,62)">descriptor</span><span style="color:rgb(0,0,0)">), Linker.</span><span style="color:rgb(0,0,0);font-style:italic">nativeLinker</span><span style="color:rg
b(0,0,0)">().downcallHandle(</span><span style="color:rgb(106,62,62)">descriptor</span><span style="color:rgb(0,0,0)">));</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> }</span></p><p style="margin:0px">
</p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(63,95,191)">/** Find Java method handle of interface for upcall from native </span><span style="color:rgb(127,127,159)">-></span><span style="color:rgb(63,95,191)"> Java */</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">public</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">static</span><span style="color:rgb(0,0,0)"> MethodHandle upcallHandle(Class<?> </span><span style="color:rgb(106,62,62)">fi</span><span style="color:rgb(0,0,0)">, String </span><span style="color:rgb(106,62,62)">name</span><span style="color:rgb(0,0,0)">, FunctionDescriptor </span><span style="color:rgb(106,62,62)">fdesc</span><span style="color:rgb(0,0,0)">) {</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weig
ht:bold">try</span><span style="color:rgb(0,0,0)"> {</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">return</span><span style="color:rgb(0,0,0)"> MethodHandles.</span><span style="color:rgb(0,0,0);font-style:italic">lookup</span><span style="color:rgb(0,0,0)">().findVirtual(</span><span style="color:rgb(106,62,62)">fi</span><span style="color:rgb(0,0,0)">, </span><span style="color:rgb(106,62,62)">name</span><span style="color:rgb(0,0,0)">, </span><span style="color:rgb(106,62,62)">fdesc</span><span style="color:rgb(0,0,0)">.toMethodType());</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> } </span><span style="color:rgb(127,0,85);font-weight:bold">catch</span><span style="color:rgb(0,0,0)"> (ReflectiveOperationException </span><span style="color:rgb(106,62,62)">ex</span><span style="color:rgb(0,0,0)">) {</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)">
</span><span style="color:rgb(127,0,85);font-weight:bold">throw</span><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">new</span><span style="color:rgb(0,0,0)"> AssertionError(</span><span style="color:rgb(106,62,62)">ex</span><span style="color:rgb(0,0,0)">);</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> }</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> }</span></p><p style="margin:0px">
</p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(63,95,191)">/// Allocate java stub for upcall</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">public</span><span style="color:rgb(0,0,0)"> MemorySegment allocate(FunctionInterface </span><span style="color:rgb(106,62,62)">javaImpl</span><span style="color:rgb(0,0,0)">, Arena </span><span style="color:rgb(106,62,62)">scope</span><span style="color:rgb(0,0,0)">) {</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> </span><span style="color:rgb(127,0,85);font-weight:bold">return</span><span style="color:rgb(0,0,0)"> Linker.</span><span style="color:rgb(0,0,0);font-style:italic">nativeLinker</span><span style="color:rgb(0,0,0)">().upcallStub(</span><span style="color:rgb(0,0,192)">upcall</span><span style="color:rgb(0,0,0)">.bindTo(</span><span style="color:rgb(106,62,62)">javaImpl</span><sp an="" style="color:rgb(0,0,0)">), <span style="color:rgb(0,0,192)">descriptor</span><span style="color:rgb(0,0,0)">, </span><span style="color:rgb(106,62,62)">scope</span><span style="color:rgb(0,0,0)">);</span></sp></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> }</span></p><p style="margin:0px"><span style="color:rgb(0,0,0)"> }</span></p><p style="margin:0px">
</p><p style="margin:0px">Worth considering?</p><p style="margin:0px">
</p><p style="margin:0px">Duncan</p></div>
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<p style="margin: 0px 0px 1.2em !important;"></p>
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