[all-commits] [llvm/llvm-project] 7c814c: [clang] Define ptrauth_sign_constant builtin. (#93...

[Ahmed Bougacha via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7c814c13d0df6dbd0ef6a8b2be214d3f6edbb566
      https://github.com/llvm/llvm-project/commit/7c814c13d0df6dbd0ef6a8b2be214d3f6edbb566
  Author: Ahmed Bougacha <ahmed at bougacha.org>
  Date:   2024-06-20 (Thu, 20 Jun 2024)

  Changed paths:
    M clang/docs/PointerAuthentication.rst
    M clang/include/clang/Basic/Builtins.td
    M clang/include/clang/Basic/DiagnosticSemaKinds.td
    M clang/lib/AST/ExprConstant.cpp
    M clang/lib/CodeGen/CGBuiltin.cpp
    M clang/lib/CodeGen/CGExprConstant.cpp
    A clang/lib/CodeGen/CGPointerAuth.cpp
    M clang/lib/CodeGen/CMakeLists.txt
    M clang/lib/CodeGen/CodeGenModule.h
    M clang/lib/Headers/ptrauth.h
    M clang/lib/Sema/SemaChecking.cpp
    A clang/test/CodeGen/ptrauth-intrinsic-sign-constant.c
    M clang/test/Sema/ptrauth-intrinsics-macro.c
    M clang/test/Sema/ptrauth.c

  Log Message:
  -----------
  [clang] Define ptrauth_sign_constant builtin. (#93904)

This is a constant-expression equivalent to
ptrauth_sign_unauthenticated.  Its constant nature lets us guarantee
a non-attackable sequence is generated, unlike
ptrauth_sign_unauthenticated which we generally discourage using.

It being a constant also allows its usage in global initializers, though
requiring constant pointers and discriminators.

The value must be a constant expression of pointer type which evaluates
to a non-null pointer.

The key must be a constant expression of type ptrauth_key.
The extra data must be a constant expression of pointer or integer type;
if an integer, it will be coerced to ptrauth_extra_data_t.
The result will have the same type as the original value.

This can be used in constant expressions.

Co-authored-by: John McCall <rjmccall at apple.com>



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