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<p style="margin: 0px 0px 1.2em !important;">On 22/06/2023 08:03,
Andrii Lomakin wrote:</p>
<p style="margin: 0px 0px 1.2em !important;"></p>
<div class="markdown-here-exclude">
<p></p>
<blockquote type="cite" cite="mid:CAJmD-=4ny8NB1m56sowXZOkPa62B5cPMcfpVBfpcyRkhH2x4hg@mail.gmail.com">
<div dir="ltr">Hi team.
<div>I am working with foreign API and noticed that offsets
are treated differently for the "set" and "copy" methods
of MemorySegment in the case of heap-based segments. </div>
<div><br clear="all">
<div>If I create a segment from let's say, byte[] and call
"set(OfDouble, 0)" on such a segment it doesn't take
array offset into account during the calculation of the
applied offset value. So it processes this offset as is,
and I get an exception about address misalignment. <br>
</div>
</div>
</div>
</blockquote>
<p></p>
</div>
<p style="margin: 0px 0px 1.2em !important;"></p>
<p style="margin: 0px 0px 1.2em !important;">The alignment
exception is by design. If you want to work with unaligned
values (because we can’t really guarantee any alignment when
working on a byte[]), then you can use the JAVA_DOUBLE_UNALIGNED
constant.</p>
<p style="margin: 0px 0px 1.2em !important;"></p>
<div class="markdown-here-exclude">
<p></p>
<blockquote type="cite" cite="mid:CAJmD-=4ny8NB1m56sowXZOkPa62B5cPMcfpVBfpcyRkhH2x4hg@mail.gmail.com">
<div dir="ltr">
<div>
<div>But if I pass offsets into the "copy" method, they
are automatically corrected.</div>
</div>
</div>
</blockquote>
<p></p>
</div>
<p style="margin: 0px 0px 1.2em !important;"></p>
<p style="margin: 0px 0px 1.2em !important;">There are several
copy methods in memory segments, which all bottom out here:</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 class="hljs language-java" 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;display: block; overflow-x: auto; padding: 0.5em; color: rgb(51, 51, 51); background: rgb(248, 248, 248) none repeat scroll 0% 0%; -moz-text-size-adjust: none;"><span class="hljs-function"><span class="hljs-keyword" style="color: rgb(51, 51, 51); font-weight: bold;">static</span> <span class="hljs-keyword" style="color: rgb(51, 51, 51); font-weight: bold;">void</span> <span class="hljs-title" style="color: rgb(153, 0, 0); font-weight: bold;">copy</span><span class="hljs-params">(MemorySegment srcSegment, ValueLayout srcElementLayout, <span class="hljs-keyword" style="color: rgb(51, 51, 51); font-weight: bold;">long</span> srcOffset,
MemorySegment dstSegment, ValueLayout dstElementLayout, <span class="hljs-keyword" style="color: rgb(51, 51, 51); font-weight: bold;">long</span> dstOffset,
<span class="hljs-keyword" style="color: rgb(51, 51, 51); font-weight: bold;">long</span> elementCount)</span> </span>{ ... }
</code></pre>
<p style="margin: 0px 0px 1.2em !important;">Now, as you can see
this method takes two layouts. The layouts are used to determine
alignment of the copy, as well as byte swap.</p>
<p style="margin: 0px 0px 1.2em !important;">If you pass
JAVA_DOUBLE to this copy method you should get exactly the same
exception you get with the get/set method. But note that the
copy method that doesn’t take a layout just uses JAVA_BYTE
underneath, so that might be why you get the impression that the
copy is working. See below:</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;">jshell> var seg = MemorySegment.allocateNative(10, SegmentScope.auto());
seg ==> MemorySegment{ array: Optional.empty address:140000700364496 limit: 10 }
jshell> var byteSeg = MemorySegment.ofArray(new byte[10]);
byteSeg ==> MemorySegment{ array: Optional[[B@7e6cbb7a] address:0 limit: 10 }
jshell> MemorySegment.copy(byteSeg, 0, seg, 0, 10); // ok, because it uses JAVA_BYTE
jshell> MemorySegment.copy(byteSeg, JAVA_DOUBLE, 0, seg, JAVA_DOUBLE, 0, 1); // fails
| Exception java.lang.IllegalArgumentException: Source segment incompatible with alignment constraints
| at MemorySegment.copy (MemorySegment.java:1352)
| at (#6:1)
jshell> MemorySegment.copy(byteSeg, JAVA_DOUBLE_UNALIGNED, 0, seg, JAVA_DOUBLE_UNALIGNED, 0, 1); // ok again
</code></pre>
<p style="margin: 0px 0px 1.2em !important;">The treatment of
alignment w.r.t. heap segments is explained in great details
here:</p>
<p style="margin: 0px 0px 1.2em !important;"><a href="https://docs.oracle.com/en/java/javase/20/docs/api/java.base/java/lang/foreign/MemorySegment.html" class="moz-txt-link-freetext">https://docs.oracle.com/en/java/javase/20/docs/api/java.base/java/lang/foreign/MemorySegment.html</a></p>
<p style="margin: 0px 0px 1.2em !important;">(Java 21 has a
similar section).</p>
<p style="margin: 0px 0px 1.2em !important;">Note that this has
nothing to do with methods not treating offsets uniformly -
offsets are in fact treated uniformly, and always checked
against the alignment constraints of the layout being used for
the dereference operation.</p>
<p style="margin: 0px 0px 1.2em !important;">If you don’t care
about alignment, use unaligned layouts (for which constants are
also provided), or use segments that wrap long[], which allow
for more alignment.</p>
<p style="margin: 0px 0px 1.2em !important;">The current behavior
is kind of a forced move, driven by the fact that heap segments
have different alignment properties based on platform and JVM
implementation. So the alignment of heap segment is defined in
terms of the lowest common denominator. If the API didn’t do
this, you might write some code using memory segments that would
work well in one platform and then fail on another because of
different alignment constraints. While platform-dependent
behavior is fair game when interacting with native code, in this
case you would be able to get platform-dependent behavior only
when accessing memory, and we didn’t want that (as this API will
likely be used as a replacement for ByteBuffer in many cases,
e.g. even when no native interop is needed).</p>
<p style="margin: 0px 0px 1.2em !important;">Cheers<br>
Maurizio</p>
<p style="margin: 0px 0px 1.2em !important;"></p>
<div class="markdown-here-exclude">
<p></p>
<blockquote type="cite" cite="mid:CAJmD-=4ny8NB1m56sowXZOkPa62B5cPMcfpVBfpcyRkhH2x4hg@mail.gmail.com">
<div dir="ltr">
<div>
<div>Is it done by design? </div>
<div>IMHO, both methods should treat offsets uniformly,
and that is not taking into account that such treatments
of offsets in "set" methods make it very hard to work
with heap-based segments.</div>
<div><br>
</div>
<div>P.S. I am using JDK 20.</div>
<span class="gmail_signature_prefix">-- </span><br>
<div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">Best regards,<br>
Andrii Lomakin.<br>
<br>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<p></p>
</div>
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