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 // Ensure that leaf function can be unwund.
11 // REQUIRES: linux && (target={{aarch64-.+}} || target={{x86_64-.+}})
12 
13 // TODO: Investigate these failures
14 // XFAIL: asan, tsan, ubsan
15 
16 // TODO: Investigate this failure
17 // XFAIL: 32bits-on-64bits
18 
19 #include <assert.h>
20 #include <dlfcn.h>
21 #include <signal.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 _Unwind_Reason_Code frame_handler(struct _Unwind_Context* ctx, void* arg) {
30   (void)arg;
31   Dl_info info = { 0, 0, 0, 0 };
32 
33   // Unwind util the main is reached, above frames deeped on the platfrom and architecture.
34   if (dladdr(reinterpret_cast<void *>(_Unwind_GetIP(ctx)), &info) &&
35       info.dli_sname && !strcmp("main", info.dli_sname)) {
36     _Exit(0);
37   }
38   return _URC_NO_REASON;
39 }
40 
41 void signal_handler(int signum) {
42   (void)signum;
43   _Unwind_Backtrace(frame_handler, NULL);
44   _Exit(-1);
45 }
46 
47 int* faultyPointer = NULL;
48 
49 __attribute__((noinline)) void crashing_leaf_func(void) {
50   *faultyPointer = 0;
51 }
52 
53 int main(int, char**) {
54   signal(SIGSEGV, signal_handler);
55   crashing_leaf_func();
56   return -2;
57 }