[squeak-dev] A update to SystemTracer for getting back to 32 bits

Eliot Miranda eliot.miranda at gmail.com
Mon Jan 12 19:02:27 UTC 2015

Hi Dave, give me detailed instructions on what to load (or preferably an image ready to go) and I'll fix this.

Eliot (phone)

On Jan 12, 2015, at 10:20 AM, "David T. Lewis" <lewis at mail.msen.com> wrote:

>> On 12.01.2015, at 01:47, David T. Lewis <lewis at mail.msen.com> wrote:
>>> I made a minor update to the SystemTracer that allows it to convert a
>>> 64-bit
>>> image back to 32-bit format, and it worked perfectly with my working
>>> Squeak
>>> image that has been in 64-bit format for several months now.
>> Nice!
>>> The resulting 32-bit image must be opened first using an interpreter
>>> VM,
>>> after which it can be run normally with a Cog VM. Tracing should be
>>> done
>>> using an interpreter VM.
>> Why is that?
> I have not yet figured out why it did not work with Cog. One possibility
> is that the system is running a jitted method at the time of the trace,
> and when the new 64-bit image wakes up in the interpreter VM, it is still
> in the middle of that method and the VM does not know what to do with it.
> That said, I also tried tracing 64 back to 32 and then running the traced
> 32-bit image immediately in Cog. That also did not work, so it may be that
> there is some other issue involved. I am guessing that it might be related
> to the saved start of memory location in the image header, but this is
> just a guess.
> Dave

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