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 // TODO: Investigate this failure
16 // XFAIL: 32bits-on-64bits
17 
18 // Basic test for _Unwind_ForcedUnwind.
19 // See libcxxabi/test/forced_unwind* tests too.
20 
21 #include <assert.h>
22 #include <dlfcn.h>
23 #include <signal.h>
24 #include <stdint.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <sys/types.h>
29 #include <unistd.h>
30 #include <unwind.h>
31 
32 void foo();
33 _Unwind_Exception ex;
34 
35 _Unwind_Reason_Code stop(int version, _Unwind_Action actions,
36                          _Unwind_Exception_Class exceptionClass,
37                          _Unwind_Exception *exceptionObject,
38                          struct _Unwind_Context *context,
39                          void *stop_parameter) {
40   assert(version == 1);
41   assert((actions & _UA_FORCE_UNWIND) != 0);
42   (void)exceptionClass;
43   assert(exceptionObject == &ex);
44   assert(stop_parameter == &foo);
45 
46   Dl_info info = {0, 0, 0, 0};
47 
48   // Unwind util the main is reached, above frames depend on the platform and
49   // architecture.
50   if (dladdr(reinterpret_cast<void *>(_Unwind_GetIP(context)), &info) &&
51       info.dli_sname && !strcmp("main", info.dli_sname)) {
52     _Exit(0);
53   }
54   return _URC_NO_REASON;
55 }
56 
57 __attribute__((noinline)) void foo() {
58 
59   // Arm EHABI defines struct _Unwind_Control_Block as exception
60   // object. Ensure struct _Unwind_Exception* work there too,
61   // because _Unwind_Exception in this case is just an alias.
62   struct _Unwind_Exception *e = &ex;
63 #if defined(_LIBUNWIND_ARM_EHABI)
64   // Create a mock exception object.
65   memset(e, '\0', sizeof(*e));
66   strcpy(reinterpret_cast<char *>(&e->exception_class), "CLNGUNW");
67 #endif
68   _Unwind_ForcedUnwind(e, stop, (void *)&foo);
69 }
70 
71 int main() {
72   foo();
73   return -2;
74 }
75