On 14 Mar 2013, at 09:09, Luboš Doležel <lu...@dolezel.info> wrote:
> CF_OBJC_FUNCDISPATCH0 is something I've already seen in certain calls in > corebase. Now I fully understand the motivation behind it. Uff, lots of work > ahead! > > And it doesn't use objc_msgSend(), it uses class_getMethodImplementation(). This macro predates the runtime supporting objc_msgSend(), but there's no reason why it couldn't be modified to use it (and would only need to be changed in one place). The runtime currently support objc_msgSend() on i386, x86-64 (SysV ABI, not Win64), and ARM (AArch32). In the next release it will support MIPS (n64, possibly n32) and I plan on adding AArch64 support when I get some hardware to play with. Looking at the Apple implementation, it appears that they removed the isa < 0xffff trick some time ago. It's almost a shame, as it's quite neat, but they probably found the same thing I did when I tried dealing with it: that it added too much extra cost to every message send to be worth it. On a somewhat related note, I have (assuming the paperwork happens in time) an intern this summer working on putting an Objective-C runtime in the FreeBSD kernel to support Objective-C and Pragmatic Smalltalk in kernelspace. We'll be looking at something similar to toll-free bridging to integrate with the kernel's KObj system. David -- Send from my Jacquard Loom _______________________________________________ Gnustep-dev mailing list Gnustep-dev@gnu.org https://lists.gnu.org/mailman/listinfo/gnustep-dev
