Hi Phil -

The only thing that comes to mind is the special objects array. Try 
executing "Smalltalk recreateSpecialObjectsArray" to ensure it is 
initialized correctly, if that doesn't help check (Smalltalk 
specialObjectsArray copyFrom: 44 to: 48) which should say 
#(ExternalAddress ExternalStructure ExternalData ExternalFunction 
ExternalLibrary).

Cheers,
   - Andreas

Phil (list) wrote:
> I'm not sure whether my problem is specific to Cuis or is more generally 
> related to installing FFI.  I've loaded FFI (from FFI-Kernel-ar9) by 
> extracting the archive, filing in the extracted .st file, and in a 
> workspace executing:
> 
> (Smalltalk at: #ExternalType) initialize.
> (Smalltalk at: #ExternalStructure) compileAllFields.
> 
> FFI appears to be working at least somewhat (i.e. I'm able to make basic 
> OpenGL calls which are behaving as expected) but when I attempt to work 
> with externally allocated memory, I'm having problems. With the 
> following example:
> 
> extern := ExternalAddress allocate: 12.
> 
> I observe the following behavior:
> 1) Do it executes without error
> 2) Most things that attempt to look at the result (i.e. print it) crash 
> the image
> 3) extern class returns CompiledMethod
> 4) Accessing it with what should be valid indexes using byteAt: and 
> byteAt:put: either result in an invalid index error or crashes the image.
> 
> The VM I'm using is 4.2.2 on OS X and I'm not able to reproduce the 
> behavior in any of my non-Cuis images and am curious if there's an 
> installation/configuration step I've missed re: FFI or if there is a bug 
> specific to Cuis that might be causing this issue?
> 
> Thanks,
> Phil
> 
>