[llvm-branch-commits] [clang] [clang] Define ptrauth_sign_constant builtin. (PR #93904)

[Daniil Kovalev via llvm-branch-commits]

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@@ -58,6 +58,35 @@ void test_string_discriminator(const char *str) {
 }
 
 
+void test_sign_constant(int *dp, int (*fp)(int)) {
+  __builtin_ptrauth_sign_constant(&dv, VALID_DATA_KEY); // expected-error {{too few arguments}}
+  __builtin_ptrauth_sign_constant(&dv, VALID_DATA_KEY, &dv, &dv); // expected-error {{too many arguments}}
+
+  __builtin_ptrauth_sign_constant(mismatched_type, VALID_DATA_KEY, 0); // expected-error {{signed value must have pointer type; type here is 'struct A'}}
+  __builtin_ptrauth_sign_constant(&dv, mismatched_type, 0); // expected-error {{passing 'struct A' to parameter of incompatible type 'int'}}
+  __builtin_ptrauth_sign_constant(&dv, VALID_DATA_KEY, mismatched_type); // expected-error {{extra discriminator must have pointer or integer type; type here is 'struct A'}}
+
+  (void) __builtin_ptrauth_sign_constant(NULL, VALID_DATA_KEY, &dv); // expected-error {{argument to ptrauth_sign_constant must refer to a global variable or function}}
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kovdan01 wrote:

Thanks for explanation. I suppose it's OK to leave the way null sign/auth is handled "as is" for this PR and ship changes (if needed) as future patches.

https://github.com/llvm/llvm-project/pull/93904