[PATCH] [Sema] Union(s) cannot have virtual functions
Davide Italiano
dccitaliano at gmail.com
Thu Jun 25 16:54:26 PDT 2015
Hi rsmith, doug.gregor,
This fixes PR23931 .
I'm not entirely sure about the words of the error message.
REPOSITORY
rL LLVM
http://reviews.llvm.org/D10752
Files:
include/clang/Basic/DiagnosticSemaKinds.td
lib/Sema/SemaDecl.cpp
test/SemaCXX/virtual-function-in-union.cpp
Index: include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- include/clang/Basic/DiagnosticSemaKinds.td
+++ include/clang/Basic/DiagnosticSemaKinds.td
@@ -1262,6 +1262,8 @@
def err_mutable_const : Error<"'mutable' and 'const' cannot be mixed">;
def err_mutable_nonmember : Error<
"'mutable' can only be applied to member variables">;
+def err_virtual_in_union : Error<
+ "function %0 declared 'virtual' within a union">;
def err_virtual_non_function : Error<
"'virtual' can only appear on non-static member functions">;
def err_virtual_out_of_class : Error<
Index: lib/Sema/SemaDecl.cpp
===================================================================
--- lib/Sema/SemaDecl.cpp
+++ lib/Sema/SemaDecl.cpp
@@ -7202,6 +7202,14 @@
dyn_cast<CXXRecordDecl>(NewFD->getDeclContext())) {
if (Parent->isInterface() && cast<CXXMethodDecl>(NewFD)->isUserProvided())
NewFD->setPure(true);
+
+ // C++ [class.union]p2
+ // A union can have member functions, but not virtual functions.
+ if (isVirtual && Parent->isUnion()) {
+ Diag(D.getDeclSpec().getVirtualSpecLoc(),
+ diag::err_virtual_in_union) << NewFD->getDeclName();
+ NewFD->setInvalidDecl();
+ }
}
SetNestedNameSpecifier(NewFD, D);
Index: test/SemaCXX/virtual-function-in-union.cpp
===================================================================
--- test/SemaCXX/virtual-function-in-union.cpp
+++ test/SemaCXX/virtual-function-in-union.cpp
@@ -0,0 +1,5 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+union x {
+ virtual void f(); // expected-error {{function 'f' declared 'virtual' within a union}}
+};
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