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 // Forced unwinding causes std::terminate when going through noexcept.
10 
11 // UNSUPPORTED: no-exceptions, c++03
12 
13 #include <exception>
14 #include <stdlib.h>
15 #include <stdio.h>
16 #include <string.h>
17 #include <unwind.h>
18 #include <tuple>
19 #include <__cxxabi_config.h>
20 
21 #if defined(_LIBCXXABI_ARM_EHABI)
22 int main(int, char**) {
23   return 0;
24 }
25 #else
26 template <typename T>
27 struct Stop;
28 
29 template <typename R, typename... Args>
30 struct Stop<R (*)(Args...)> {
31   // The third argument of _Unwind_Stop_Fn is uint64_t in Itanium C++ ABI/LLVM
32   // libunwind while _Unwind_Exception_Class in libgcc.
33   typedef typename std::tuple_element<2, std::tuple<Args...>>::type type;
34 
35   static _Unwind_Reason_Code stop(int, _Unwind_Action actions, type,
36                                   struct _Unwind_Exception*,
37                                   struct _Unwind_Context*, void*) {
38     if (actions & _UA_END_OF_STACK)
39       abort();
40     return _URC_NO_REASON;
41   }
42 };
43 
44 static void forced_unwind() {
45   _Unwind_Exception* exc = new _Unwind_Exception;
46   exc->exception_class = 0;
47   exc->exception_cleanup = 0;
48   _Unwind_ForcedUnwind(exc, Stop<_Unwind_Stop_Fn>::stop, 0);
49   abort();
50 }
51 
52 static void test() noexcept { forced_unwind(); }
53 
54 static void terminate() { exit(0); }
55 
56 int main(int, char**) {
57   std::set_terminate(terminate);
58   try {
59     test();
60   } catch (...) {
61   }
62   abort();
63 }
64 #endif
65