[pypy-dev] The JVM backend and Jython

Leonardo Santagada santagada at gmail.com
Wed Mar 30 19:57:30 CEST 2011

On Wed, Mar 30, 2011 at 2:37 PM, fwierzbicki at gmail.com
<fwierzbicki at gmail.com> wrote:
> On Wed, Mar 30, 2011 at 12:18 AM, Antonio Cuni <anto.cuni at gmail.com> wrote:
>> I have to warn you that at the moment, you cannot invoke any Java code from
>> RPython.  Implementing it has been on my todo list for years now :-(, but I
>> never managed to find the time and the motivation to do it.  However, for
>> using the PyPy parser inside Jython it should be enough to do the other way
>> around, i.e. call RPython code from Java, which should be possible.
> My thoughts here are taking a very primitive step - that is run the
> JVM translation and look at the generated Java - then see what needs
> to be modified so that I could use the generated Java parser from
> Jython. At this stage I would be using PyPy exactly the way I use
> ANTLR now - as a parser generator. There wouldn't be any need at all
> for calling into Java code (as far as I can think of). I think if we
> Jython developers get some experience with PyPY - we might be able to
> help with the task of calling into Java from PyPy - since we know a
> bit about that :)

IIRC the jvm backend generates java bytecode directly in text form for
a java assembler (I forgot the name of it), maybe a step would be to
see if there is any way to import the .class back in a java program.

Leonardo Santagada

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