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<p>Hey Manuel,</p>
<p>Thanks for giving jextract 22 a try, and sorry for the
frustrating experience.</p>
<p>- The <font face="monospace">NullPointerException </font>is
definitely a bug. Jextract should not just report an exception.
We'll have a closer look at this on Monday, and see if we can find
what code causes the issue. It would help if you could edit the
jextract launch script, and add
`JLINK_VM_OPTIONS=-Djextract.debug=true` (`JLINK_VM_OPTIONS=`
should already be there), and then retry the failed extraction.
This should print out more information, including the entire stack
trace. that's the part I'm interested in.<br>
<br>
<br>
> I don't understand the error message. What does "xxx depends
on yyy which has been excluded" mean? Have I used it incorrectly?
The error message mostly mentions types (and possibly functions)
that I don't use, neither directly nor indirectly.
</p>
<p>It is meant to tell the user that they've included something that
depends on something else which was not included. This would
previously lead to uncompileable code, since FunctionDescriptors
and MemoryLayouts now refer directly to the layouts defined in
struct classes. For example, if I have a function like `void
foo(struct A)`, then the FunctionDescriptor for `foo` will depend
directly on the class we generate for `struct A`:<br>
<font face="monospace"><br>
FunctionDescriptor.ofVoid(<br>
A.layout()<br>
);</font></p>
<p>If `A` itself is not included, this code would be uncompileable.
So, in the latest version we (try to) issue an error about that.</p>
<p>- For the 'ERROR's due to missing dependencies you are seeing:
this also looks like a bug. We are currently issuing errors if a
_skipped_ symbols depends on a skipped symbol as well, which makes
no sense. We can just ignore missing dependencies of skipped
things. I've tried to implement a quick fix here [1]. Though, you
might be better off using the pre-built binaries for now, which
don't have this dependency scanning behavior in the first place
(i.e the builds at jdk.java.net/jextract)<br>
<br>
<br>
> And why are udev, udev_list_entry, udev_device etc. skipped?
They used to work with jextract 21.</p>
<p>- I took a look at libudev.h, and the warnings about unsupported
types seem correct to me. e.g. `struct udev` does not have a
definition in libudev.h [2], so jextract can not generate a class
for it (since the layout and fields are not known). That is all
the the warning is trying to say. The other structs about which
you get a warning seems to be the same in that they don't have a
definition in that file. (FWIW this is one of the areas we put a
lot of effort into, so it makes sense that you didn't seen a
warning in JDK 21). I think we need to clarify the error message
to say more than "is not supported" though.<br>
<br>
<br>
> /usr/include/linux/usbdevice_fs.h: The code generated for the
struct usbdevfs_urb does not compile (it refers to a
type usbdevfs_iso_packet_desc, which is missing).</p>
<p>This is actually the situation we were trying to detect with the
ERRORs you encountered. There should have been an error about <font face="monospace">usbdevfs_iso_packet_desc</font> being excluded,
but it seems like we are not scanning the element types of arrays
at the moment (linked PR tries to fix this as well).<br>
<br>
<br>
And finally, yeah: we need to update the README on the master
branch to reference JDK 22 instead of 21.<br>
</p>
<p>Thanks for reporting back! While we try to test as much as
possible, some issues slip through the cracks, and are only found
through user feedback like yours.<br>
Jorn<br>
</p>
<p>[1]: <a class="moz-txt-link-freetext" href="https://github.com/openjdk/jextract/pull/217">https://github.com/openjdk/jextract/pull/217</a><br>
[2]:
<a class="moz-txt-link-freetext" href="https://github.com/systemd/systemd/blob/main/src/libudev/libudev.h#L20C1-L20C13">https://github.com/systemd/systemd/blob/main/src/libudev/libudev.h#L20C1-L20C13</a><br>
</p>
<div class="moz-cite-prefix">On 17/02/2024 15:40, Manuel
Bleichenbacher wrote:<br>
</div>
<blockquote type="cite" cite="mid:CAA7F5j+AieT36VTCGqtUZaH5T7=_7Rv+zRFowZq0WzWcUFcjhg@mail.gmail.com">
<div dir="ltr">
<div dir="ltr">Hi Maurizio
<div><br>
</div>
<div>I have tried to upgrade the JavaDoesUSB library (<a href="https://github.com/manuelbl/JavaDoesUSB" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">https://github.com/manuelbl/JavaDoesUSB</a>)
from JDK 21 to 22, and it was very frustrating. It failed on
macOS, Windows nor Linux. And the problem is jextract.</div>
<div><br>
</div>
<div>(The header files I'm trying the process are operating
system header files.)</div>
<div><br>
</div>
<div><br>
</div>
<div>On macOS, it always crashes:</div>
<div><br>
</div>
<div>FATAL: Unexpected exception
java.lang.NullPointerException: Cannot invoke
"org.openjdk.jextract.Declaration$Constant.name()" because
"<parameter2>" is null occurred<br>
</div>
<div><br>
</div>
<div>I've tried different branches (master, panama, jdk22) and
the pre-built binaries. They all behave the same except the
error message is sometimes shorter and starts at "Cannot
invoke..."</div>
<div><br>
</div>
<div>The full commands can be found here (remove "--source"): <a href="https://github.com/manuelbl/JavaDoesUSB/blob/main/java-does-usb/jextract/macos/gen_macos.sh" moz-do-not-send="true" class="moz-txt-link-freetext">https://github.com/manuelbl/JavaDoesUSB/blob/main/java-does-usb/jextract/macos/gen_macos.sh</a></div>
<div><br>
</div>
<div><br>
</div>
<div>On Linux, jextract worked partially. But for several
files, it refused to generate anything or generated code
that didn't compile:</div>
<div><br>
</div>
<div>/usr/include/fcntl.h:</div>
<div>ERROR: stat depends on timespec which has been excluded<br>
ERROR: stat depends on timespec which has been excluded<br>
ERROR: stat depends on timespec which has been excluded<br>
</div>
<div><br>
</div>
<div>/usr/include/libudev.h:</div>
<div>ERROR: __pthread_list_t depends on
__pthread_internal_list which has been excluded<br>
ERROR: __pthread_slist_t depends on __pthread_internal_slist
which has been excluded<br>
ERROR: __pthread_mutex_s depends on __pthread_internal_list
which has been excluded<br>
WARNING: Skipping va_list (type <error: struct
__va_list_tag> is not supported)<br>
WARNING: Skipping __gnuc_va_list (type <error: struct
__va_list_tag> is not supported)<br>
WARNING: Skipping udev (type Declared(udev) is not
supported)<br>
WARNING: Skipping udev_list_entry (type
Declared(udev_list_entry) is not supported)<br>
WARNING: Skipping udev_device (type Declared(udev_device) is
not supported)<br>
WARNING: Skipping udev_monitor (type Declared(udev_monitor)
is not supported)<br>
WARNING: Skipping udev_enumerate (type
Declared(udev_enumerate) is not supported)<br>
WARNING: Skipping udev_queue (type Declared(udev_queue) is
not supported)<br>
WARNING: Skipping udev_hwdb (type Declared(udev_hwdb) is not
supported)<br>
</div>
<div><br>
</div>
<div>sys/epoll.h:</div>
<div>ERROR: __pthread_list_t depends on
__pthread_internal_list which has been excluded<br>
ERROR: __pthread_slist_t depends on __pthread_internal_slist
which has been excluded<br>
ERROR: __pthread_mutex_s depends on __pthread_internal_list
which has been excluded<br>
ERROR: epoll_data_t depends on epoll_data which has been
excluded<br>
ERROR: epoll_event depends on epoll_data which has been
excluded<br>
</div>
<div><br>
</div>
<div>/usr/include/linux/usbdevice_fs.h:<br>
</div>
<div>The code generated for the structusbdevfs_urb does not
compile (it refers to a type usbdevfs_iso_packet_desc, which
is missing).</div>
<div><br>
</div>
<div>The full commands for jextract can be found here. I've
only removed "--source" as it is no longer needed.</div>
<div><a href="https://github.com/manuelbl/JavaDoesUSB/blob/main/java-does-usb/jextract/linux/gen_linux.sh" moz-do-not-send="true" class="moz-txt-link-freetext">https://github.com/manuelbl/JavaDoesUSB/blob/main/java-does-usb/jextract/linux/gen_linux.sh</a><br>
</div>
<div><br>
</div>
<div>All these files could successfully be processed with
jextract 21.</div>
<div><br>
</div>
<div>I don't understand the error message. What does "xxx
depends on yyy which has been excluded" mean? Have I used it
incorrectly? The error message mostly mentions types (and
possibly functions) that I don't use, neither directly nor
indirectly.</div>
<div><br>
</div>
<div>And why are udev, udev_list_entry, udev_device etc.
skipped? They used to work with jextract 21.</div>
<div><br>
</div>
<div><br>
</div>
<div>On Windows, it completely failed as well. jextract
outputs more than 5000 lines of errors and warnings. Here is
just a random selection:</div>
<div><br>
</div>
<div>ERROR: mbstate_t depends on _Mbstatet which has been
excluded<br>
</div>
<div>ERROR: LIST_ENTRY depends on _LIST_ENTRY which has been
excluded<br>
</div>
<div>ERROR: depends on _M128A which has been excluded<br>
</div>
<div>ERROR: WIN32_FIND_STREAM_DATA depends on
_WIN32_FIND_STREAM_DATA which has been excluded<br>
</div>
<div>ERROR: tagEXTLOGFONTW depends on tagLOGFONTW which has
been excluded<br>
</div>
<div>ERROR: MULTIKEYHELPW depends on tagMULTIKEYHELPW which
has been excluded<br>
</div>
<div>WARNING: Skipping MEM_EXTENDED_PARAMETER.Reserved
(bitfields are not supported)<br>
</div>
<div>WARNING: Skipping Flags.Reserved (bitfields are not
supported)<br>
</div>
<div><br>
</div>
<div>The full command can be found here (remove "--source"): <a href="https://github.com/manuelbl/JavaDoesUSB/blob/main/java-does-usb/jextract/windows/gen_win.cmd" moz-do-not-send="true" class="moz-txt-link-freetext">https://github.com/manuelbl/JavaDoesUSB/blob/main/java-does-usb/jextract/windows/gen_win.cmd</a></div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>The REAMDE on <a href="https://github.com/openjdk/jextract" moz-do-not-send="true" class="moz-txt-link-freetext">https://github.com/openjdk/jextract</a>
could also profit from an update:</div>
<div><br>
</div>
<div>The command line "$ sh ./gradlew
-Pjdk21_home=<jdk21_home_dir> ..." sent me on search
for the branch with the JDK 22 code. But it's just the
README that's outdated.</div>
<div><br>
</div>
<div>And the instruction "Run the Gradle build with a Java
version appropriate for the Gradle version. For example,
Gradle 7.5.1 supports JDK 21." sent me down another rabbit
hole. I have the latest Gradle version installed, which
nicely runs with JDK 21. But it failed anyway. Turns out
that the installed gradle is irrelevant but the gradle
wrapper relevant (see command line above). And the gradle
wrapper is at version 7.3.3. So there is nothing to choose
really. You must use JDK 17 (or even earlier). It has never
worked with JDK 21.</div>
<div><br>
</div>
<div><br>
</div>
<div>I would appreciate some feedback. Are these bugs? Or has
jextract become so much more restrictive?</div>
<div><br>
</div>
<div>Regards</div>
<div>Manuel</div>
<div><br>
</div>
<div><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">Am Fr., 16. Feb. 2024 um
16:50 Uhr schrieb Maurizio Cimadamore <<a href="mailto:maurizio.cimadamore@oracle.com" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">maurizio.cimadamore@oracle.com</a>>:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">Hi,<br>
with JDK 22 near us, we have spent some quality time with
jextract, to <br>
make sure the code it generates is as good as it can be
ahead of the <br>
finalizaton of the FFM API. This resulted in several
changes, both in <br>
the implementation (so, invisible to jextract users) and in
the <br>
generated code, as we cleaned up the translation strategy to
better <br>
adhere with the core principles behind the jextract tool.
These changes <br>
are captured in details in this document:<br>
<br>
<a href="https://cr.openjdk.org/~mcimadamore/panama/jextract_changes.html" rel="noreferrer" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">https://cr.openjdk.org/~mcimadamore/panama/jextract_changes.html</a><br>
<br>
It might be a good time to take the latest jextract for a
spin (using <br>
your favourite C library!) and report back, in case we
missed anything. <br>
You can find the latest sources in this branch:<br>
<br>
<a href="https://github.com/openjdk/jextract/tree/panama" rel="noreferrer" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">https://github.com/openjdk/jextract/tree/panama</a><br>
<br>
Binary snapshots of this newer version are also available
here (note <br>
that MacOS/Arm64 builds is also supported now):<br>
<br>
<a href="https://jdk.java.net/jextract/" rel="noreferrer" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">https://jdk.java.net/jextract/</a><br>
<br>
Cheers<br>
Maurizio<br>
<br>
</blockquote>
</div>
</div>
</blockquote>
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