[swift-dev] swift_retainCount in CoreFoundation
phausler at apple.com
Sat Dec 26 14:52:25 CST 2015
> On Dec 26, 2015, at 12:31 PM, Joe Groff <jgroff at apple.com> wrote:
>> On Dec 25, 2015, at 9:02 PM, Philippe Hausler <phausler at apple.com <mailto:phausler at apple.com>> wrote:
>> > On Dec 22, 2015, at 1:08 PM, Joe Groff via swift-dev <swift-dev at swift.org <https://lists.swift.org/mailman/listinfo/swift-dev>> wrote:
>> > It looks like the corelibs implementation of CoreFoundation references swift_retainCount in order to implement CFGetRetainCount. Is getting the retain count necessary to CF functionality, or can these functions be removed?
>> For some reason I was not on this list;
>> So in response to your query about CF’s usage of CFGetRetainCount - I think we can safely forbid that function in the swift version since there is no safe way to use it (even CFMachPort is a bit dodgy for it’s usage).
>> It might take some surgery but I can probably excise that fairly simply.
> That'd be awesome. Thanks Philippe! For CFMachPort's usage, since it's checking for a retainCount of 1, maybe we could use swift_isUniquelyReferenced* instead, which we do need to reliably support for COW.
Actually the method that was being used there is not even compiled on mac targets, I was able to safely excise the usage and disallow the function in the Swift version of CF.
I pushed this:
Which should no longer swift_retainCount in swift-corelibs-foundation builds anymore.
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