On 2016-06-22 1:05 PM, Henri Sivonen wrote:
Additionally, there was some discussion about reference counting.
Implementing an XPCOM binding for Rust was not a popular idea and was
discarded. Still, it was considered important to be able to use
Gecko-style reference counting in a cycle collector-compatible manner
across the C++/Rust boundary. Specifically, we should introduce a
macro for implementing AddRef, Release and associated cycle collection
methods in Rust in a cycle collector-compatible way and we should
implement a Gecko-flavored replacement for Rc<> that calls Gecko-style
AddRef/Release as appropriate.
Now that I'm looking at the hand-written notes that I made in the
meeting, I notice that the above paragraph fails to say how the
AddRef, Release and associated cycle collection-related calls are
routed from C++ to Rust or from Rust to C++. There was some talk about
vtable hacks, but my recollection is that those got rejected along
with XPCOM. So as far as I can tell, we are left with the meeting not
concluding how exactly these calls across the language boundary.
I do not recall dismissing exposing COM-compatible vtables from Rust.
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