[all-commits] [llvm/llvm-project] ac604c: [lsan][Darwin] Unconditionally strip high bits fro...

[Leonard Grey via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ac604cc310b70c45a07fc9edeaced4b402739af1
      https://github.com/llvm/llvm-project/commit/ac604cc310b70c45a07fc9edeaced4b402739af1
  Author: Leonard Grey <lgrey at chromium.org>
  Date:   2023-07-17 (Mon, 17 Jul 2023)

  Changed paths:
    M compiler-rt/lib/lsan/lsan_common.cpp

  Log Message:
  -----------
  [lsan][Darwin] Unconditionally strip high bits from potential pointers

The method cache stashes a mask in the high bits under some circumstances:
https://github.com/apple-oss-distributions/objc4/blob/689525d556eb3dee1ffb700423bccf5ecc501dbf/runtime/objc-cache.mm#L589

I'm hitting this now on macOS 13.4 arm64, so we can no longer rely on OBJC_FAST_IS_RW to identify potential pointers that need to be transformed

Differential Revision: https://reviews.llvm.org/D153471