1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // UNSUPPORTED: c++03
10 // UNSUPPORTED: no-exceptions
11
12 #include <cassert>
13 #include <cstddef>
14 #include <cstdlib>
15 #include <type_traits>
16
17 struct A {};
18
19 template<typename T, bool CanCatchNullptr>
catch_nullptr_test()20 static void catch_nullptr_test() {
21 try {
22 throw nullptr;
23 } catch (T &p) {
24 assert(CanCatchNullptr && !static_cast<bool>(p));
25 } catch (...) {
26 assert(!CanCatchNullptr);
27 }
28 }
29
main(int,char **)30 int main(int, char**)
31 {
32 static_assert(std::is_same<std::nullptr_t, decltype(nullptr)>::value, "");
33
34 // A reference to nullptr_t can catch nullptr.
35 catch_nullptr_test<std::nullptr_t, true>();
36 catch_nullptr_test<const std::nullptr_t, true>();
37 catch_nullptr_test<volatile std::nullptr_t, true>();
38 catch_nullptr_test<const volatile std::nullptr_t, true>();
39
40 // No other reference type can.
41 #if 0
42 // FIXME: These tests fail, because the ABI provides no way for us to
43 // distinguish this from catching by value.
44 catch_nullptr_test<void *, false>();
45 catch_nullptr_test<void * const, false>();
46 catch_nullptr_test<int *, false>();
47 catch_nullptr_test<A *, false>();
48 catch_nullptr_test<int A::*, false>();
49 catch_nullptr_test<int (A::*)(), false>();
50 #endif
51
52 return 0;
53 }
54