[Vm-dev] A stab at explaining Spur

Clément Bera bera.clement at gmail.com
Fri Aug 14 06:41:27 UTC 2015

2015-08-14 4:29 GMT+02:00 Ryan Macnak <rmacnak at gmail.com>:

> On Thu, Aug 13, 2015 at 1:19 AM, Clément Bera <bera.clement at gmail.com>
> wrote:
>> I heard recently that the implementation used by Cincom Smalltalk,
>> splitting the object in 2 (header + fields), is also used in Pypy and the
>> Dart VM as Python and Dart allow the user to add instance variables to
>> objects at runtime which leads to the same problem.
> Objects are not split in the Dart VM, and it does not support adding
> instance variables or otherwise changing classes at runtime. Objects have a
> single-word header with a class index, size information and GC bits.
> Identity hashes are not often used in Dart, so they are kept in a side
> table.

And I put "accept" on a paper that was claiming that... Damned. Any clue
about Pypy ?
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