Diagnose taking the address of a bit-field inside a conditional operator.

llvm-svn: 81808

clang/lib/Sema/SemaExpr.cpp

@@ -5062,6 +5062,10 @@ QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) {
     Diag(OpLoc, diag::err_typecheck_address_of)
       << "property expression" << op->getSourceRange();
     return QualType();
+  } else if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(op)) {
+    // FIXME: Can LHS ever be null here?
+    if (!CheckAddressOfOperand(CO->getLHS(), OpLoc).isNull())
+      return CheckAddressOfOperand(CO->getRHS(), OpLoc);
   } else if (dcl) { // C99 6.5.3.2p1
     // We have an lvalue with a decl. Make sure the decl is not declared
     // with the register storage-class specifier.

clang/test/SemaCXX/conditional-expr.cpp

@@ -174,7 +174,9 @@ void test()
   // Conversion of primitives does not result in an lvalue.
   &(i1 ? i1 : d1); // expected-error {{address expression must be an lvalue or a function designator}}
 
-
+  (void)&(i1 ? flds.b1 : flds.i1); // expected-error {{address of bit-field requested}}
+  (void)&(i1 ? flds.i1 : flds.b1); // expected-error {{address of bit-field requested}}
+  
   // Note the thing that this does not test: since DR446, various situations
   // *must* create a separate temporary copy of class objects. This can only
   // be properly tested at runtime, though.