[Vm-dev] A stab at explaining Spur

[Ryan Macnak]

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.
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