[clang] [PAC] Add support for __ptrauth type qualifier (PR #100830)

[Aaron Ballman via cfe-commits]

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@@ -3401,6 +3401,40 @@ void Parser::DistributeCLateParsedAttrs(Decl *Dcl,
   }
 }
 
+/// type-qualifier:
+///    ('__ptrauth') '(' constant-expression
+///                   (',' constant-expression)[opt]
+///                   (',' constant-expression)[opt] ')'
+void Parser::ParsePtrauthQualifier(ParsedAttributes &attrs) {
+  assert(Tok.is(tok::kw___ptrauth));
+
+  IdentifierInfo *KwName = Tok.getIdentifierInfo();
+  SourceLocation KwLoc = ConsumeToken();
+
+  BalancedDelimiterTracker T(*this, tok::l_paren);
+  if (T.expectAndConsume())
+    return;
+
+  ArgsVector ArgExprs;
+  do {
+    ExprResult ER = ParseAssignmentExpression();
+    if (ER.isInvalid()) {
+      T.skipToEnd();
+      return;
+    }
+    ArgExprs.push_back(ER.get());
+  } while (TryConsumeToken(tok::comma));
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AaronBallman wrote:

This doesn't match the grammar in the comment above -- it allows an arbitrary number of expressions to be parsed instead of failing when I'd expect it to.

https://github.com/llvm/llvm-project/pull/100830