[all-commits] [llvm/llvm-project] 0b0a37: [clang] Lifetime of locals must end before musttai...

[Oliver Stannard via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0b0a37e158bcf6d0667b4744b3d335f91578e0c9
      https://github.com/llvm/llvm-project/commit/0b0a37e158bcf6d0667b4744b3d335f91578e0c9
  Author: Oliver Stannard <oliver.stannard at arm.com>
  Date:   2024-09-23 (Mon, 23 Sep 2024)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/include/clang/Basic/AttrDocs.td
    M clang/include/clang/Basic/DiagnosticSemaKinds.td
    M clang/lib/Sema/CheckExprLifetime.cpp
    M clang/lib/Sema/CheckExprLifetime.h
    M clang/lib/Sema/SemaStmt.cpp
    M clang/test/SemaCXX/attr-musttail.cpp

  Log Message:
  -----------
  [clang] Lifetime of locals must end before musttail call (#109255)

The lifetimes of local variables and function parameters must end before
the call to a [[clang::musttail]] function, instead of before the
return, because we will not have a stack frame to hold them when doing
the call.

This documents this limitation, and adds diagnostics to warn about some
code which is invalid because of it.



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