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|ID||Category||Severity||Reproducibility||Date Submitted||Last Update|
|0007454||[Squeak] VM||feature||always||01-16-10 19:03||10-10-10 14:29|
|Summary||0007454: Removal of obsolete prim support for closures is a problem for Scratch images|
Support for some obsolete numbered primitives was removed to make way for closure support. Scratch is based on an older Squeak, and loses some network prims when running on closure-enabled VMs.
It would be good to restore backward compatibility to support Scratch images if possible.
Discussion is on squeak-dev and vm-dev (Jan 2010). John Maloney provides this explanation:
> From: John Maloney <firstname.lastname@example.org>
> Date: 16. Januar 2010 16:21:59 MEZ
> To: Bert Freudenberg <email@example.com>
> Cc: Ian Piumarta <firstname.lastname@example.org>
> Subject: Re: [Vm-dev] Re: [squeak-dev] Numbered primitives in images
> Hi, Bert.
> Thanks for the alert.
> Yep, this would be a problem for Scratch. It would prevent sharing projects on the website. Normally, I would not mind sticking with an older VM, but that there is also a
+change in the sound support on Linux from ALSA to Pulse Audio that we need, and work on that is still ongoing. So we may need to use a current VM, at least on Linux.
> Any chance there are some other numbered primitives that could be co-opted for the closure prims? As I recall there were lots of unused numbered primitives.
> -- John
(0013487 - 797 - 833 - 833 - 833 - 833 - 833)
John Maloney wrote in a follow-up:
Elliot's idea -- just fix the Scratch image to use the named socket prims -- sounds like a winner. It's simple, it doesn't add any complexity to the VM's, and it doesn't break anything. And it puts the burden on Scratch, where it belongs.
Assuming the named socket primitives do exactly the same things the numbered ones did (and it sounds like they do, since the numbered prims have been re-directed to the named ones for about a decade :-)) then nothing should break, right?
Note that Scratch comes bundled with a copy of the Squeak VM, and the bundled VM in the current release still has support for the numbered socket primitives. So this VM change only matters for future releases of Scratch (and the Linux package, which is in active development).
(0013504 - 1021 - 1375 - 1483 - 1483 - 1483 - 1483)
Update on related impact to sound recording for Scratch:
From: John M McIntosh <email@example.com>
Date: Mon, 1 Feb 2010 22:56:25 -0800
To: Squeak Virtual Machine Development Discussion
Subject: [Vm-dev] sound recording in Scratch with new VM
For people keeping track of this, as earlier discussed we grabbed some number primitives originally used by Sockets in the early part
of the last decade for use by the Closure VM, which makes running a Scratch image difficult. Mind it's 5 minutes work to fix in the image.
This evening I discovered that sound recording was changed at some point and the numbered primitives are now marked obsolete.
/* 190*/ (void *)primitiveObsoleteIndexedPrimitive,
/* 191*/ (void *)primitiveObsoleteIndexedPrimitive,
/* 192*/ (void *)primitiveObsoleteIndexedPrimitive,
/* 193*/ (void *)primitiveObsoleteIndexedPrimitive,
/* 194*/ (void *)primitiveObsoleteIndexedPrimitive,
(0013887 - 119 - 119 - 119 - 119 - 119 - 119)
|This should be considered a known limitation of the current VMs. Scratch developers are aware and updating accordingly.|
|01-16-10 19:03||lewis||New Issue|
|01-16-10 19:03||lewis||Status||new => assigned|
|01-16-10 19:03||lewis||Assigned To||=> lewis|
|01-18-10 14:48||bert||Note Added: 0013487|
|02-02-10 12:07||lewis||Note Added: 0013504|
|10-10-10 14:29||lewis||Status||assigned => closed|
|10-10-10 14:29||lewis||Note Added: 0013887|
|10-10-10 14:29||lewis||Resolution||open => fixed|
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