[Vm-dev] Interpreter simulator error

[Eliot Miranda]

Hi Subbu,

> On May 11, 2020, at 6:17 AM, K K Subbu <kksubbu.ml at gmail.com> wrote:
> 
> On 06/05/20 1:19 am, karl ramberg wrote:
> 
>> Seems wrong with floating point value here ?
>> Bitmap(Object)>>at:put:
>> Receiver: a Bitmap of length 5499668
>> Arguments and temporary variables:
>> index: 4902231
>> value: 0.006711409395973154
>> Receiver's instance variables:
>> a Bitmap of length 5499668
> 
> The problem turned out to be that the simulator allocates a Bitmap for its memory and Bitmap does not support at:put: in SVN trunk. It only supports ByteAt:put: :-(.
> 
> I then tried simulating Squeak32 3.8 image on Squeak 5.3+VMMaker but the simulator crashed even earlier - many ivars being used before init. E.g. it calls on primitiveVMParameter which tries to read stats* even before they are bound in GC.
> 
> I am not sure of what I should do now. Should I get InterpreterSimulator working in VMMaker and then port it to VMMaker.oscog or get it working in VMMaker.oscog directly?

Because VMMaker.oscog works and is the production environment for opensmalltalk VMs it will be more effective to work within VMMaker.oscog, not breaking anything, having the full VMMaker.oscog facilities available, than working within VMMaker and porting later.  IMO.

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