self-referecing operator '->' member function was causing

infinit recursion. This patch fixes it. [13.3.1.2]-p2

llvm-svn: 83124

Author: Fariborz Jahanian

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -1646,6 +1646,8 @@ def err_return_in_constructor_handler : Error<
 
 def err_ident_in_pseudo_dtor_not_a_type : Error<
   "identifier %0 in pseudo-destructor expression does not name a type">;
+def err_operator_arrow_circular : Error<
+  "circular pointer delegation detected">;
 def err_pseudo_dtor_base_not_scalar : Error<
   "object expression of non-scalar type %0 cannot be used in a "
   "pseudo-destructor expression">;

clang/lib/Sema/SemaExprCXX.cpp

@@ -1982,6 +1982,11 @@ Sema::ActOnStartCXXMemberReference(Scope *S, ExprArg Base, SourceLocation OpLoc,
       BaseExpr = (Expr*)Base.get();
       if (BaseExpr == NULL)
         return ExprError();
+      if (Context.getCanonicalType(BaseExpr->getType()) == 
+          Context.getCanonicalType(BaseType)) {
+        Diag(OpLoc, diag::err_operator_arrow_circular);
+        return ExprError();
+      }
       BaseType = BaseExpr->getType();
     }
   }

clang/test/SemaCXX/overloaded-operator.cpp

@@ -213,3 +213,14 @@ namespace M {
 struct AA { bool operator!=(AA&); };
 struct BB : AA {};
 bool x(BB y, BB z) { return y != z; }
+
+
+struct AX { 
+  AX& operator ->();
+  int b;
+}; 
+
+void m() {
+  AX a; 
+  a->b = 0; // expected-error {{circular pointer delegation detected}}
+}