1 // -*- C++ -*-
2 //===----------------------------------------------------------------------===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // REQUIRES: linux
11 
12 // Basic test for _Unwind_ForcedUnwind.
13 // See libcxxabi/test/forced_unwind* tests too.
14 
15 #include <assert.h>
16 #include <dlfcn.h>
17 #include <signal.h>
18 #include <stdint.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <sys/types.h>
23 #include <unistd.h>
24 #include <unwind.h>
25 
26 void foo();
27 _Unwind_Exception ex;
28 
29 _Unwind_Reason_Code stop(int version, _Unwind_Action actions,
30                          _Unwind_Exception_Class exceptionClass,
31                          _Unwind_Exception *exceptionObject,
32                          struct _Unwind_Context *context,
33                          void *stop_parameter) {
34   assert(version == 1);
35   assert((actions & _UA_FORCE_UNWIND) != 0);
36   (void)exceptionClass;
37   assert(exceptionObject == &ex);
38   assert(stop_parameter == &foo);
39 
40   Dl_info info = {0, 0, 0, 0};
41 
42   // Unwind util the main is reached, above frames depend on the platform and
43   // architecture.
44   if (dladdr(reinterpret_cast<void *>(_Unwind_GetIP(context)), &info) &&
45       info.dli_sname && !strcmp("main", info.dli_sname)) {
46     _Exit(0);
47   }
48   return _URC_NO_REASON;
49 }
50 
51 __attribute__((noinline)) void foo() {
52 
53   // Arm EHABI defines struct _Unwind_Control_Block as exception
54   // object. Ensure struct _Unwind_Exception* work there too,
55   // because _Unwind_Exception in this case is just an alias.
56   struct _Unwind_Exception *e = &ex;
57 #if defined(_LIBUNWIND_ARM_EHABI)
58   // Create a mock exception object.
59   memset(e, '\0', sizeof(*e));
60   strcpy(reinterpret_cast<char *>(&e->exception_class), "CLNGUNW");
61 #endif
62   _Unwind_ForcedUnwind(e, stop, (void *)&foo);
63 }
64 
65 int main() {
66   foo();
67   return -2;
68 }
69