[llvm-branch-commits] [clang] [clang] Define ptrauth_string_discriminator builtin. (PR #93903)

[Anton Korobeynikov via llvm-branch-commits]

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@@ -2156,6 +2156,24 @@ static ExprResult PointerAuthAuthAndResign(Sema &S, CallExpr *Call) {
   return Call;
 }
 
+static ExprResult PointerAuthStringDiscriminator(Sema &S, CallExpr *call) {
+  if (checkPointerAuthEnabled(S, call)) return ExprError();
+
+  // We've already performed normal call type-checking.
+  Expr *arg = call->getArgs()[0]->IgnoreParenImpCasts();
+
+  // Operand must be an ordinary or UTF-8 string literal.
+  auto literal = dyn_cast<StringLiteral>(arg);
+  if (!literal || literal->getCharByteWidth() != 1) {
+    S.Diag(arg->getExprLoc(), diag::err_ptrauth_string_not_literal)
+      << (literal ? 1 : 0)
+      << arg->getSourceRange();
+    return ExprError();
+  }
+
+  return call;
----------------
asl wrote:

```suggestion
  return Call;
```

https://github.com/llvm/llvm-project/pull/93903