[fpc-devel] The "implements" keyword

[Florian Klaempfl]

Christian Iversen wrote:
> Finally I got some spare time for coding.
> 
> So, after quite a bit of help from Florian (Thank you!), the 
> implements-keyword is.... well, IMPLEMENTED! Finally!
> 
> It's not yet in trunk, but it will be soon.
> 
> As far as I can tell, it's completely hack-free, but I will submit the 
> revisions as patches for code review.
> 
> The code is still not complete, and there are some needed changes that will 
> happen when I can find the time (for instance, what's the procedure to add 
> new compiler messages? should I just add them to errore.msg?)

Yes, at the appropriate place. Then run make msg in fpc/compiler and
commit the changed msg*.inc files as well.

> 
> The current version of the patch adds 2*sizeof(pointer) to each 
> TInterfaceEntry. That might seem like a lot, but with bitpacking this can be 
> brought down to just 1*sizeof(pointer). 
> 
> Now, to make the bitpacking I need to be able to assume VMT's are always 
> aligned to at least 4-byte boundaries. I think this is a safe assumption, but 
> maybe it's not?

Well, when compiling optimized for size it isn't I fear.

> 
> (if this is not possible, it's not a huge problem, just a slight waste of 
> space)
> 
> I'd be happy to answer any questions, or hear any comments regarding this new 
> feature.
>