[squeak-dev] Older VM's won't start the latest beta images

Eliot Miranda eliot.miranda at gmail.com
Sat Jun 25 17:30:54 UTC 2022

On Sun, May 29, 2022 at 7:03 AM David T. Lewis <lewis at mail.msen.com> wrote:

> On Sun, May 29, 2022 at 08:06:59AM +0000, Jaromir Matas wrote:
> > Hi,
> > I wonder what?s changed that the images starting from
> Squeak6.0beta-21772-64bit on won?t start with the previous release VM
> (squeak.cog.spur_win64x64_202003021730) or even with pre-release new VMs
> (e.g. version 3154).
> >
> > I?m on Win10, the process explorer (windows) shortly runs WerFault.exe
> and than the Squeak process is closed/disappears.
> >
> The change is here:
> http://lists.squeakfoundation.org/pipermail/squeak-dev/2022-May/220660.html
> The current release candidate image does not have this, but it will be
> applied as soon as you update that image, and it expected to be part of
> the final release. The update applies a new image format number to the
> saved image files (stored in the first 4 bytes of the image file) when
> multiple bytecode set support is required from the VM. Effectively, the
> means that the image is using the Sista bytecode set. Older VMs can
> run the Sista bytecodes but do not yet have the code for recognizing
> the additional image format number.

So given that older VMs supported the bytecode set and have (as do all Cog
VMs) a VM parameter flag bit to indicate this, what's the rationale for the
image format number including whether the image chooses to use the bytecode
set or not?

> Dave

best, Eliot
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