[clang] [clang] Implement type/address discrimination of type_info vtable. (PR #99726)

[Daniil Kovalev via cfe-commits]

================
@@ -0,0 +1,87 @@
+// RUN: %clang_cc1 -DENABLE_TID=0 -I%S -std=c++11 -triple=arm64e-apple-darwin \
+// RUN:   -fptrauth-calls -fptrauth-intrinsics \
+// RUN:   -fptrauth-vtable-pointer-type-discrimination \
+// RUN:   -fptrauth-vtable-pointer-address-discrimination \
+// RUN:   %s -emit-llvm -o - | FileCheck %s --check-prefixes=CHECK,NODISC
+
+// RUN: %clang_cc1 -DENABLE_TID=1 -I%S -std=c++11 -triple=arm64e-apple-darwin \
+// RUN:   -fptrauth-calls -fptrauth-intrinsics \
+// RUN:   -fptrauth-vtable-pointer-type-discrimination \
+// RUN:   -fptrauth-vtable-pointer-address-discrimination \
+// RUN:   -fptrauth-type-info-vtable-pointer-discrimination \
+// RUN:   %s -emit-llvm -o - | FileCheck %s --check-prefixes=CHECK,DISC
+
+// copied from typeinfo
+namespace std {
+
+#if __has_cpp_attribute(clang::ptrauth_vtable_pointer)
+#  if __has_feature(ptrauth_type_info_vtable_pointer_discrimination)
+#    define _LIBCPP_TYPE_INFO_VTABLE_POINTER_AUTH \
+       [[clang::ptrauth_vtable_pointer(process_independent, address_discrimination, type_discrimination)]]
+#  else
+#    define _LIBCPP_TYPE_INFO_VTABLE_POINTER_AUTH \
+       [[clang::ptrauth_vtable_pointer(process_independent, no_address_discrimination, no_extra_discrimination)]]
+#  endif
+#else
+#  define _LIBCPP_TYPE_INFO_VTABLE_POINTER_AUTH
+#endif
+
+  class _LIBCPP_TYPE_INFO_VTABLE_POINTER_AUTH type_info
+  {
+    type_info& operator=(const type_info&);
+    type_info(const type_info&);
+
+  protected:
+      explicit type_info(const char* __n);
+
+  public:
+      virtual ~type_info();
+
+      virtual void test_method();
+  };
+}
----------------
kovdan01 wrote:

```suggestion
} // namespace std
```

https://github.com/llvm/llvm-project/pull/99726