[Vm-dev] Re: [Cog] reproducable crash with SmallInteger as methods

Mariano Martinez Peck marianopeck at gmail.com
Fri Dec 17 10:01:52 UTC 2010

Hi Eliot. I "fix/patch" it by chaging primitiveIndexOf:   to this:

primitiveIndexOf: methodPointer
    "Note: We now have 10 bits of primitive index, but they are in two
    for temporary backward compatibility.  The time to unpack is negligible,
     since the derived primitive function pointer is stored in the method
    | primBits |

    (objectMemory isOopCompiledMethod: methodPointer)
            [primBits := ((self headerOf: methodPointer) >> 1) bitAnd:
            ^(primBits bitAnd: 16r1FF) + (primBits >> 19)]
            [^ 0 ].

at least for my case, it patches the problem. Still, I have no idea:

- the implicance/side effect of this change
- why in development was crashing but not in deployment.



On Thu, Dec 16, 2010 at 5:27 PM, Mariano Martinez Peck <
marianopeck at gmail.com> wrote:

> Hi Eliot. Today I can reproduce a do-it that crash Cog, when using
> SmallIntegers as compiled methods. The problem is actually that IT ONLY
> crashes when compiling in XCode with "Development". However, if I compile
> with "Deployment", it doesn't crash....
> The code is this:
> SmallInteger compile: 'flushCache "emtpy"'.
> SmallInteger compile: 'run: aSelector with: arguments in: aReceiver
>     Transcript show: ''something''.'.
> TestCase compile: 'foo  ^ ''foo'' '.
> TestCase methodDict at: #foo put: 5.
> TestCase new foo.
> I really don't understand how this can work in "Deployment" but not in
> "Development" since the code is the same as I know. Maybe when debugging
> certain functions/methods are called that crash?
> Thanks for any tip.
> Mariano
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