[Vm-dev] VM Maker: VMMaker.oscog-rsf.1951.mcz

[Eliot Miranda]

Hi Ronie,

    then I'll take a look at fixing the 00000000 1xxxxxxx ... case.  The nice thing is that it's all localized to the extBBytecode.  Excuse my confusion earlier in the week.

_,,,^..^,,,_ (phone)

> On Nov 4, 2016, at 12:53 AM, Ronie Salgado <roniesalg at gmail.com> wrote:
> 
> Hi Eliot,
> 
>>   in the below you, Roni, added extBFirstZero.  As far as I can tell this breaks the newspeak (and Cadence (*)) VM.  I don't quite see the purpose of extBFirstZero and urgently need to restore the Newspeak and Cadence VMs.  So forgive me but I'm going to revert that part of the changes.  It has caused me to misdiagnose the problems with extPushInteger and genExtUnconditionalJump.  These I'll revert too.  If this breaks Lowcode then let's collaborate on developing a fix for Lowcode that doesn't break Newspeak and Cadence VMs.  But it's a priority of mine (they pay for my work) to keep these VMs working.
>> 
> This was a quick hack that I added to be able to encode unsigned values such as 0x00FF . Since ExtB is signed, the sequence ExtB 00 ExtB FF ends decoded as -1 (0xFFFFFFFF) instead of 255, which is the correct value, and it is used by some Lowcode instructions such as pointer offsetting.
> 
> I am still trying to figure out how to move into the opensmalltalk-vm branch. I have been using the pharo-vm branch mostly because the scripts for making a Squeak bases VM Maker image are not working on my Linux boxes.
> 
> Best regards,
> Ronie
> 
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