[PATCH] D81678: Introduce partialinit attribute at call sites for stricter poison analysis

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

So I guess we've discussed the following alternatives so far:

1. Attach the "frozen" attribute everywhere; this makes the textual IR generated by clang messy, and likely bloats memory usage (not sure by how much).
2. Invert the meaning of the attribute; this makes reasoning about it messy.
3. Have a "frozen" attribute, but have a function attribute "frozen_args" to freeze all arguments.  This is slightly messy to access from C++, and messy to modify from C++.
4. Choose one of the previous three for memory, and a different one for textual IR, and do some magic to translate.  This makes it harder to understand the in-memory representation from reading textual IR.

I'm not particularly happy with any of these...

Maybe (1) is the least-bad; all the others compromise by making LLVM harder to understand.  We can make porting the clang tests easier by adding a cc1 flag to turn off emitting frozen attributes, I guess (so instead of updating the CHECK lines, you could just mechanically update the RUN line).

Maybe worth sending an email to llvm-dev.


Repository:
  rG LLVM Github Monorepo

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https://reviews.llvm.org/D81678