[Vm-dev] Return a value from the image to the VM

[Rob Rothwell]

Then, of course, all I want to do is something like:

int ioExit(void)
{
  inCleanExit = 1;
  exit(osErrorCode);
  /* avoid the warnings here */
  return 0;

in sqWin32Window.c...

Take care,

Rob

On Mon, Nov 23, 2009 at 12:19 AM, John M McIntosh <
johnmci at smalltalkconsulting.com> wrote:

>
> Well yes you need to use VMMaker
> Look at the gcBiasToGrowGCLimit setup.
> gcBiasToGrowGCLimit is an instance var on Interpreter
> Then you need
>
> Interpreter>>primitiveSetGCBiasToGrowGCLimit
>        "Primitive. If the GC logic has  bias to grow, set growth limit"
>        | value |
>        self export: true.
>        value := self stackIntegerValue: 0.
>        successFlag ifTrue:[
>                gcBiasToGrowGCLimit := value.
>                //Other clutter here which is not important to the example
>                self pop: argumentCount.
>        ].
>
> Then an example to call it.
>
> SystemDictionary>>setGCBiasToGrowGCLimit: aNumber
>        "Primitive. Indicate that the bias to grow logic should do a GC
> after aNumber Bytes"
>        <primitive: 'primitiveSetGCBiasToGrowGCLimit'>
>        ^self primitiveFailed
> "Example:
>        Smalltalk setGCBiasToGrowGCLimit: 16*1024*1024.
> "
>
> Squeak calls the routine ioExit() to exit, which is platform dependent, in
> that routine you
> would need to load the return code and do something interesting with it.
>
>
> On 2009-11-22, at 5:12 AM, Rob Rothwell wrote:
>
> >
> > On 22.11.2009, at 05:07, Rob Rothwell wrote:
> > > Hello...
> > >
> > > For scripting purposes, I just want to be able to do something like:
> > >
> > > SmalltalkImage current quit: errorCode.
> > >
> > > So that in the VM I can essentially do:
> > >
> > > return errorCode.
> > >
> > > at the end of sqMain?
> > >
> > > Any pointers on how to push a value BACK to the VM?  I have only barely
> dabbled with adding some custom menu commands to the VM long ago, and have
> no idea where to start.
> >
> > You would need to add a primitive to set the errorCode. This would be
> stored in an interpreter variable. Then the VM's exit code would be modified
> to retrieve that value.
> >
> > So, unlike all the other examples out there, this would probably be best
> if it were NOT an external plugin?  Would you be able to use VMMaker to do
> this (I've never done that before), or just go hand code some stuff?
> >
> > Do you think this seems like a generically pretty useful think to add to
> the VM?  If so, I suppose I would like to do it right!
> >
> > I hacked a temporary solution together with batch files and unique file
> names, but it feels a little sloppy.
> >
> > Thanks,
> >
> > Rob
>
> --
> ===========================================================================
> John M. McIntosh <johnmci at smalltalkconsulting.com>   Twitter:
>  squeaker68882
> Corporate Smalltalk Consulting Ltd.  http://www.smalltalkconsulting.com
> ===========================================================================
>
>
>
>
>
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