Lists are resizable, GcArray are not. A Python "list" object will become a
GcArray automatically if you never call a method that can resize it, such
as append. Basically for it to be a GcArray you should allocate it with
[None] * n, and then only use __setitem__ and __getitem__.
Cheers,
Alex
On Sat, Oct 11, 2014 at 8:08 AM, Timothy Baldridge <tbaldri...@gmail.com>
wrote:
> I'm in the process of tuning my JIT, and thus far it's going pretty well.
> However I can't mark the args in my Frame object a virtualizable array,
> because doing so throws this exception:
>
> [translation:info] File
> "/Users/tim/Dropbox/oss/pypy/rpython/jit/metainterp/warmspot.py", line 477,
> in make_virtualizable_infos
> [translation:info] vinfos[VTYPEPTR] = VirtualizableInfo(self, VTYPEPTR)
> [translation:info] File
> "/Users/tim/Dropbox/oss/pypy/rpython/jit/metainterp/virtualizable.py", line
> 52, in __init__
> [translation:info] assert isinstance(ARRAY, lltype.GcArray)
>
> Digging into it I see that ARRAY is: <GcStruct list { length, items }>--
>
> That makes me think that there's something I'm doing to my list of args
> that's flagging it as a list instead of a GcArray? Before I go and rework
> how args are handled in my interpreter I'd like a bit more information
> about what could be going on here.
>
> For the record, I make sure that every access to my args array is inside
> the valid range of the array, and is always a positive value. I'm then
> marking it as "args[*]" in my virtualizables.
>
> If I remove the [*] it translates fine, but then allocates a list on every
> invocation of an interpreter function.
>
> Thanks for all the help this far, my interpreter is coming along nicely.
>
> Timothy Baldridge
>
>
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