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JIT: pgo/devirt diagnostic improvements #53247
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Please describe the memory behavior of this pointer. In particular, is it expected to be remain across multiple calls to resolveVirtulaMethod?
Also, superpmi is not currently storing/restoring this value.
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Currently it is only used immediately after the call.
I suppose it would be simpler to make it an enum. I made it a string because I anticipated there would be a lot of churn as we evolve this and didn't want to also have to rev the jit interface each time.
I don't expect actual behavior of the jit to depend on this -- it is just there for diagnostics -- so perhaps an enum with an understanding that a given jit build might see values outside its known enum range will work.
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A string is a fine choice. I just want to document its memory behavior, and used directly after the call is a simple and fairly common behavior in the jit interface. The only concern is that handling of strings across the managed/native boundary needs to have some care taken around object lifetime, etc, and writing down the contract is necessary.
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I went ahead and changed it over to an enum, it's simple for SPMI to deal with.