Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/libcxxabi/test/catch_reference_nullptr.pass.cpp

@@ -0,0 +1,49 @@
+//===--------------------- catch_pointer_nullptr.cpp ----------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++98, c++03, libcxxabi-no-exceptions
+
+#include <cassert>
+#include <cstdlib>
+
+struct A {};
+
+template<typename T, bool CanCatchNullptr>
+static void catch_nullptr_test() {
+  try {
+    throw nullptr;
+  } catch (T &p) {
+    assert(CanCatchNullptr && !static_cast<bool>(p));
+  } catch (...) {
+    assert(!CanCatchNullptr);
+  }
+}
+
+int main()
+{
+  using nullptr_t = decltype(nullptr);
+
+  // A reference to nullptr_t can catch nullptr.
+  catch_nullptr_test<nullptr_t, true>();
+  catch_nullptr_test<const nullptr_t, true>();
+  catch_nullptr_test<volatile nullptr_t, true>();
+  catch_nullptr_test<const volatile nullptr_t, true>();
+
+  // No other reference type can.
+#if 0
+  // FIXME: These tests fail, because the ABI provides no way for us to
+  // distinguish this from catching by value.
+  catch_nullptr_test<void *, false>();
+  catch_nullptr_test<void * const, false>();
+  catch_nullptr_test<int *, false>();
+  catch_nullptr_test<A *, false>();
+  catch_nullptr_test<int A::*, false>();
+  catch_nullptr_test<int (A::*)(), false>();
+#endif
+}