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 // _Unwind_ForcedUnwind raised exception can be caught by catch (...) and be
10 // rethrown. If not rethrown, exception_cleanup will be called.
11 
12 // UNSUPPORTED: no-exceptions, c++03
13 
14 // These tests fail on previously released dylibs, investigation needed.
15 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
16 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
17 
18 #include <stdlib.h>
19 #include <string.h>
20 #include <unwind.h>
21 #include <tuple>
22 #include <__cxxabi_config.h>
23 
24 static int bits = 0;
25 
26 struct C {
27   int bit;
28   C(int b) : bit(b) {}
29   ~C() { bits |= bit; }
30 };
31 
32 template <typename T>
33 struct Stop;
34 
35 template <typename R, typename... Args>
36 struct Stop<R (*)(Args...)> {
37   // The third argument of _Unwind_Stop_Fn is uint64_t in Itanium C++ ABI/LLVM
38   // libunwind while _Unwind_Exception_Class in libgcc.
39   typedef typename std::tuple_element<2, std::tuple<Args...>>::type type;
40 
41   static _Unwind_Reason_Code stop(int, _Unwind_Action actions, type,
42                                   struct _Unwind_Exception*,
43                                   struct _Unwind_Context*, void*) {
44     if (actions & _UA_END_OF_STACK)
45       abort();
46     return _URC_NO_REASON;
47   }
48 };
49 
50 static void cleanup(_Unwind_Reason_Code, struct _Unwind_Exception* exc) {
51   bits |= 8;
52   delete exc;
53 }
54 
55 static void forced_unwind() {
56   _Unwind_Exception* exc = new _Unwind_Exception;
57   memset(&exc->exception_class, 0, sizeof(exc->exception_class));
58   exc->exception_cleanup = cleanup;
59   _Unwind_ForcedUnwind(exc, Stop<_Unwind_Stop_Fn>::stop, 0);
60   abort();
61 }
62 
63 static void test() {
64   try {
65     C four(4);
66     try {
67       C one(1);
68       forced_unwind();
69     } catch (...) {
70       bits |= 2;
71       throw;
72     }
73   } catch (int) {
74   } catch (...) {
75     // __cxa_end_catch calls cleanup.
76   }
77 }
78 
79 int main(int, char**) {
80   test();
81   return bits != 15;
82 }
83