[Vm-dev] Fwd: About systemTracer

[Eliot Miranda]

On Sat, Dec 31, 2011 at 2:37 PM, Igor Stasenko <siguctua at gmail.com> wrote:

>
> system tracer writes an image 6404 version
> while cog uses 6405
> i dont remember what is the difference between them, can someone remind me?
>

You mean 6504 (6502 + 2) and 6505 (6504+1).

6502 = the Squeak V3 format with blue-book BlockContext (but _without_
BlockClosure support).
6504 = the Squeak V3 format with blue-book BlockContext /and/ BlockClosure
support.
6505 = the Squeak V3 format with BlockClosure support (but _without_
BlockContext support).

One simple approach is to have the SystemTracer write out an image with the
format of the VM.
This is Smalltalk vmParameterAt: 41


>
> On 31 December 2011 10:49, Luc Fabresse <luc.fabresse at gmail.com> wrote:
> >
> > Hi All,
> >
> >  I am forwarding a message from David (Thanks a lot to him) who pointed
> that SystemTracer2 should be run  with a non-cog VM otherwize, the
> generated image is not usable.
> >
> >  Does someone know why?
> >  Thanks,
> >
> > #Luc
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: David T. Lewis <lewis at mail.msen.com>
> > Date: 2011/12/30
> >
> > Actually, I think I just spotted the problem. If I use an interpreter
> > VM to run the system tracer, then load the cloned image with an
> interpreter
> > VM, then save the cloned image, then run it under Cog, it works.
> >
> > If I use Cog to do the system tracing, the cloned image does not work.
> >
> > If I use the interpreter VM to trace the image, then run the cloned
> > image under Cog, it does not work.
> >
> > If I run the same cloned image on an interpreter VM, it works.
> >
> > After the cloned image has been saved from an interpreter VM, it
> > can be used with Cog.
> >
> > I do not know the reason for this, but that is what I am seeing.
> >
> > I am using Linux, but on a Mac you can probably use Ian's unix VM
> > for Mac from http://squeakvm.org/unix/ and see if you get the same
> > results.
> >
> > Dave
> >
> >
>
>
>
> --
> Best regards,
> Igor Stasenko.
>



-- 
best,
Eliot
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