[pypy-dev] Telling the JIT to remove a stack array

[Maciej Fijalkowski]

since we managed to even write a document, please read it ;-)

http://doc.pypy.org/en/latest/jit/virtualizable.html

On Mon, Feb 24, 2014 at 9:37 PM, Timothy Baldridge <tbaldridge at gmail.com> wrote:
> That did the trick. My "count up" program now consists of int_eq, a guard
> and int_add, that's what I wanted to see.  Thanks!
>
> Timothy
>
>
> On Sun, Feb 23, 2014 at 1:06 AM, Armin Rigo <arigo at tunes.org> wrote:
>>
>> Hi Timothy,
>>
>> On 23 February 2014 01:24, Timothy Baldridge <tbaldridge at gmail.com> wrote:
>> > I tried digging into the PyPy source to find how how this is done there,
>> > but
>> > I haven't been able to find it yet.
>>
>> pypy/interpreter/pyframe.py: self.locals_stack_w.  The trick is that
>> it's an attribute of a "frame" class, which is itself turned into a
>> virtualizable with a special declaration about the attribute.  See
>> ``PyFrame._virtualizable_ = ['locals_stack_w[*]']'' in
>> pypy/module/pypyjit/interp_jit.py.  It's currently the only way to
>> trigger special behavior about the list: you have to make it a
>> special attribute of a virtualizable "frame" class.
>>
>>
>> A bientôt,
>>
>> Armin.
>
>
>
>
> --
> “One of the main causes of the fall of the Roman Empire was that–lacking
> zero–they had no way to indicate successful termination of their C
> programs.”
> (Robert Firth)
>
> _______________________________________________
> pypy-dev mailing list
> pypy-dev at python.org
> https://mail.python.org/mailman/listinfo/pypy-dev
>