[all-commits] [llvm/llvm-project] ef84e1: [compiler-rt][memprof] fix off-by-one in shadow ac...

[David CARLIER via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ef84e19e3fd3f13ffbc87544054e6605226dfc79
      https://github.com/llvm/llvm-project/commit/ef84e19e3fd3f13ffbc87544054e6605226dfc79
  Author: David CARLIER <devnexen at gmail.com>
  Date:   2026-07-09 (Thu, 09 Jul 2026)

  Changed paths:
    M compiler-rt/lib/memprof/memprof_allocator.cpp
    M compiler-rt/lib/memprof/memprof_mapping.h
    M compiler-rt/lib/memprof/tests/CMakeLists.txt
    A compiler-rt/lib/memprof/tests/shadow.cpp

  Log Message:
  -----------
  [compiler-rt][memprof] fix off-by-one in shadow access-count accumula… (#208376)

…tion.

GetShadowCount and GetShadowCountHistogram used an inclusive loop up to
MEM_TO_SHADOW(p + size), summing an extra adjacent cell when p + size is
granule-aligned. Use p + size - 1 to stay within the allocation.



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