[all-commits] [llvm/llvm-project] aaa4eb: [Clang][Sema] Reland -Wstringop-overread with comp...

[John Paul Jepko via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: aaa4ebd2ad174920ddce67c4641292a44788e879
      https://github.com/llvm/llvm-project/commit/aaa4ebd2ad174920ddce67c4641292a44788e879
  Author: John Paul Jepko <john.jepko at ericsson.com>
  Date:   2026-07-16 (Thu, 16 Jul 2026)

  Changed paths:
    M clang/docs/ReleaseNotes.md
    M clang/include/clang/Basic/DiagnosticSemaKinds.td
    M clang/lib/AST/ComputeDependence.cpp
    M clang/lib/Sema/SemaChecking.cpp
    M clang/test/AST/ByteCode/builtin-functions.cpp
    M clang/test/Analysis/bstring.c
    M clang/test/Analysis/malloc.c
    M clang/test/Analysis/pr22954.c
    M clang/test/Sema/builtin-memcpy.c
    M clang/test/Sema/builtin-object-size.c
    M clang/test/Sema/warn-fortify-source.c
    A clang/test/Sema/warn-stringop-overread-fortify.c
    A clang/test/Sema/warn-stringop-overread.c
    M clang/test/SemaCXX/warn-memset-bad-sizeof.cpp
    M compiler-rt/test/asan/TestCases/Windows/issue64990.cpp

  Log Message:
  -----------
  [Clang][Sema] Reland -Wstringop-overread with computeDependence fix (#208012)

Reland #183004 and follow-up #205201 (reverted in #207840) which adds `-Wstringop-overread` to warn when memory functions `memcpy`, `memmove`, `memcmp`, and other related builtins read more bytes than the source buffer size.

The revert was due to a crash when a memory function is called on `&x` where `x` is a static constexpr local inside a template. The original PR exposed a bug in `computeDependence(UnaryOperator*)` where only the value-dependence bit is set for this case, when the instantiation-dependence bit should also be set. This is the root cause behind the crash.

Fix `computeDependence` to properly set both value and instantiation-dependence bits, and add a regression for this crash via `warn-stringop-overread.c`.



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