[Vm-dev] Reserving/allocating some slots in the specialObjectsArray for DoubleByteArray, WordArray and DoubleWordArray
Juan Vuletich
JuanVuletich at zoho.com
Wed Jan 15 13:36:38 UTC 2020
Hi Eliot, Folks,
Speaking for Cuis.
On 1/13/2020 2:47 PM, Eliot Miranda wrote:
> Hi All,
>
> currently the following slots in the specialObjectsArray are
> unused in both Squeak and Pharo (& I suspect Cuis).
>
> newArray at: 32 put: nil. "was the prototype Float"
> newArray at: 33 put: nil. "was the prototype 4-byte LargePositiveInteger"
> newArray at: 34 put: nil. "was the prototype Point"
>
> The specialObjectsArray already contains ByteArray
> newArray at: 27 put: ByteArray.
Yep. The same in Cuis.
> I would like to have a full set of little-endian unsigned integer
> arrays. In Spur Squeak these are ByteArray, DoubleByteArray,
> WordArray (Bitmap is big endian), and DoubleWordArray.
Same in Spur Cuis (if you load the optional
"Collections-TwoAndEightByteArrays.pck.st" package).
> The VM's at:[put:] directly supports these four at the JIT level
> giving us efficient unsigned access. There is also efficient signed
> access for some signed arrays but these are less useful (at least in
> theVM simulator).
>
> I want to make all four unsigned integer array classs available to
> plugins etc via the interpreterProxy. So here's a formal request to
> reserve these values for use as follows:
> newArray at: 27 put: ByteArray.
> ...
> newArray at: 32 put: DoubleByteArray.
> newArray at: 33 put: WordArray.
> newArray at: 34 put: DoubleWordArray.
>
> _,,,^..^,,,_
> best, Eliot
>
Sounds good to me.
Thanks,
--
Juan Vuletich
www.cuis-smalltalk.org
https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev
https://github.com/jvuletich
https://www.linkedin.com/in/juan-vuletich-75611b3
@JuanVuletich
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