[squeak-dev] [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.


Juan Vuletich

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