[all-commits] [llvm/llvm-project] 00c43a: [C2y] Implement WG14 N3369 and N3469 (_Countof) (#...

[Aaron Ballman via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 00c43ae23524d72707701620da89ad248393a8e4
      https://github.com/llvm/llvm-project/commit/00c43ae23524d72707701620da89ad248393a8e4
  Author: Aaron Ballman <aaron at aaronballman.com>
  Date:   2025-03-27 (Thu, 27 Mar 2025)

  Changed paths:
    M clang/docs/LanguageExtensions.rst
    M clang/docs/ReleaseNotes.rst
    M clang/include/clang/AST/Stmt.h
    M clang/include/clang/AST/Type.h
    M clang/include/clang/Basic/DiagnosticParseKinds.td
    M clang/include/clang/Basic/DiagnosticSemaKinds.td
    M clang/include/clang/Basic/Features.def
    M clang/include/clang/Basic/TokenKinds.def
    M clang/lib/AST/ByteCode/Compiler.cpp
    M clang/lib/AST/ExprConstant.cpp
    M clang/lib/AST/ItaniumMangle.cpp
    M clang/lib/CodeGen/CGExprScalar.cpp
    M clang/lib/Parse/ParseExpr.cpp
    M clang/lib/Sema/SemaExpr.cpp
    A clang/test/C/C2y/n3369.c
    A clang/test/C/C2y/n3369_1.c
    A clang/test/C/C2y/n3369_2.c
    A clang/test/C/C2y/n3469.c
    M clang/www/c_status.html

  Log Message:
  -----------
  [C2y] Implement WG14 N3369 and N3469 (_Countof) (#133125)

C2y adds the `_Countof` operator which returns the number of elements in
an array. As with `sizeof`, `_Countof` either accepts a parenthesized
type name or an expression. Its operand must be (of) an array type. When
passed a constant-size array operand, the operator is a constant
expression which is valid for use as an integer constant expression.

This is being exposed as an extension in earlier C language modes, but
not in C++. C++ already has `std::extent` and `std::size` to cover these
needs, so the operator doesn't seem to get the user enough benefit to
warrant carrying this as an extension.

Fixes #102836



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