[PATCH] D105201: [hwasan] Detect use after scope within function.

[Evgenii Stepanov via Phabricator via llvm-commits]

eugenis added inline comments.


================
Comment at: llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp:1350
+      }
+      if (!StandardLifetime) {
+        for (auto &II : Info.LifetimeStart)
----------------
vitalybuka wrote:
> can we avoid removing them? it can break other optimizations.
> I guess the goal is to avoid them in tagLifetimeEnd, but recalculating them in StandardLifetime there is cheap.
We can't. Tagging before/after lifetime is UB - consider that this memory may be reused for another alloca with different tag value.


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https://reviews.llvm.org/D105201