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 // TODO: Investigate these failures
13 // XFAIL: asan, tsan, ubsan
14 
15 // Basic test for _Unwind_ForcedUnwind.
16 // See libcxxabi/test/forced_unwind* tests too.
17 
18 #include <assert.h>
19 #include <dlfcn.h>
20 #include <signal.h>
21 #include <stdint.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <sys/types.h>
26 #include <unistd.h>
27 #include <unwind.h>
28 
29 void foo();
30 _Unwind_Exception ex;
31 
32 _Unwind_Reason_Code stop(int version, _Unwind_Action actions,
33                          _Unwind_Exception_Class exceptionClass,
34                          _Unwind_Exception *exceptionObject,
35                          struct _Unwind_Context *context,
36                          void *stop_parameter) {
37   assert(version == 1);
38   assert((actions & _UA_FORCE_UNWIND) != 0);
39   (void)exceptionClass;
40   assert(exceptionObject == &ex);
41   assert(stop_parameter == &foo);
42 
43   Dl_info info = {0, 0, 0, 0};
44 
45   // Unwind util the main is reached, above frames depend on the platform and
46   // architecture.
47   if (dladdr(reinterpret_cast<void *>(_Unwind_GetIP(context)), &info) &&
48       info.dli_sname && !strcmp("main", info.dli_sname)) {
49     _Exit(0);
50   }
51   return _URC_NO_REASON;
52 }
53 
54 __attribute__((noinline)) void foo() {
55 
56   // Arm EHABI defines struct _Unwind_Control_Block as exception
57   // object. Ensure struct _Unwind_Exception* work there too,
58   // because _Unwind_Exception in this case is just an alias.
59   struct _Unwind_Exception *e = &ex;
60 #if defined(_LIBUNWIND_ARM_EHABI)
61   // Create a mock exception object.
62   memset(e, '\0', sizeof(*e));
63   strcpy(reinterpret_cast<char *>(&e->exception_class), "CLNGUNW");
64 #endif
65   _Unwind_ForcedUnwind(e, stop, (void *)&foo);
66 }
67 
68 int main() {
69   foo();
70   return -2;
71 }
72