[PATCH] D121835: [HWASan] do not replace lifetime intrinsics with tagged address.

[Florian Mayer via Phabricator via llvm-commits]

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Quote from the LLVM Language Reference

  If ptr is a stack-allocated object and it points to the first byte of the
  object, the object is initially marked as dead. ptr is conservatively
  considered as a non-stack-allocated object if the stack coloring algorithm
  that is used in the optimization pipeline cannot conclude that ptr is a
  stack-allocated object.

By replacing the alloca pointer with the tagged address, we will confuse
the stack coloring algorithm.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D121835

Files:
  llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
  llvm/test/Instrumentation/HWAddressSanitizer/exception-lifetime.ll
  llvm/test/Instrumentation/HWAddressSanitizer/stack-coloring.ll
  llvm/test/Instrumentation/HWAddressSanitizer/use-after-scope.ll

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