Devin Coughlin ef4a89c479 [Exclusivity] Enforce exclusive access for class offsets in KeyPaths ...

Add dynamic enforcement of exclusive access when a KeyPath directly accesses a final
stored property on an instance of a class. For read-only projections, this begins and ends
the access immediately. For mutable projections, this uses the ClassHolder to perform
a long-term access that lasts as long as the lifetime of the ClassHolder.

rdar://problem/31972680

2018-04-19 21:37:12 -07:00

9.3 KiB

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