On 2 Mar 2011, at 12:26, Frédéric Point wrote:

> Is the obc_msgSend function available in other Obj-C runtime ? Do you
> have some plan to implement it in the new libobjc2 ?

No, there are no plans to implement it.  It is not possible to implement in a 
portable way - the Mac runtime needs completely different implementations for 
each of the supported architectures, plus different variations for methods that 
return floating point values and structures.  This would not be feasible for us 
to do in something that needs to be portable.

> Where in OSX environnment this function is implemented (libSystem or dyld) ?

In libobjc.  OS X also does some cheating in dyld so libobjc is always loaded 
at the same location in memory, so you can do a direct jump to objc_msgSend().

If you want a portable solution, then you can use 
class_getMethodImplementation(), but it's not very sensible.  

David

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