Andrew Trick 0b3027a37e Add destroy_value [poison] support to mandatory copy propagation. ...

Ensure that any object lifetime that will be shortened ends in
destroy_value [poison], indicating that the reference should not be
dereferenced (e.g. by the debugger) beyond this point.

This has no way of knowing whether the object will actually be
deallocated at this point. It conservatively avoids showing garbage to
debuggers.

Part 1/2: rdar://75012368 (-Onone compiler support for early object
deinitialization with sentinel dead references)

2021-03-12 19:32:55 -08:00

5.6 KiB

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