Proof of concept: Groveller tool(aka jextract)

[Henry Jen]

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http://cr.openjdk.java.net/~henryjen/panama/jextract/

Feedbacks/recommendations are welcome.

Cheers,
Henry


On 09/24/2014 10:48 PM, Henry Jen wrote:
> Hi,
>
> Attached please find a proof of concept of the jextract tool,
> implemented on top of jnr-clang(with local modification to add couple
> more function binding to libclang).
>
> With FindSymbol, one can give a header file and specified symbols to be
> extracted into a interface, and the tool will generate jnr code to
> describe the interface and all struct involved, it's not perfect but
> demonstrate what can be done.
>
> Test.java is the code manualy written to load the native library, in it
> is some code to show we can call to some native functions, in this POC,
> __xstat, gettimeofday and puts.
>
> The work flow to get Test.java working is like this,
>
> 1. Create a headers.h to include needed header files, in this example
> following three are needed for above functions,
>
> #include <stdio.h>
> #include <sys/stat.h>
> #include <sys/time.h>
>
> 2. `java -cp $CP -Xint FindSymbol headers.h __xstat gettimeofday puts`
>
> This will generate a couple java files, MiniLibC.java is the interface
> and other java files describe struct used in those functions, in this
> case, Stat.java, Timespec.java, Timeval.java and Timezone.java.
>
> $CP will have jnr-clang and all its dependencies.
>
> 3. Build generated code and Test.java with javac, will need jnr-ffi in
> classpath.
>
> 4. Run the Test with java -cp $CP Test <file to get stat>. $CP will have
> jnr-ffi and its dependencies.
>
> The POC is tested on Linux with libclang installed.
>
> Like I said, this is a proof of concept, but I would expect simple C
> functions can be quickly generated in the same manner and called
> properly. Certainly there are many places can be improved, this is just
> a start.
>
> Now questions is when will we be able to see jnr code get into panama
> repo? Assuming that's required for this POC to continue evolving within
> panama repo.
>
> Cheers,
> Henry