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: x86_64-linux
12
13 #include <assert.h>
14 #include <dlfcn.h>
15 #include <signal.h>
16 #include <stdio.h>
17 #include <stdlib.h>
18 #include <string.h>
19 #include <sys/types.h>
20 #include <unistd.h>
21 #include <unwind.h>
22
frame_handler(struct _Unwind_Context * ctx,void * arg)23 _Unwind_Reason_Code frame_handler(struct _Unwind_Context* ctx, void* arg) {
24 (void)arg;
25 Dl_info info = { 0, 0, 0, 0 };
26 assert(dladdr((void*)_Unwind_GetIP(ctx), &info));
27
28 // Unwind util the main is reached, above frames deeped on the platfrom and architecture.
29 if(info.dli_sname && !strcmp("main", info.dli_sname)) {
30 _Exit(0);
31 }
32 return _URC_NO_REASON;
33 }
34
signal_handler(int signum)35 void signal_handler(int signum) {
36 (void)signum;
37 _Unwind_Backtrace(frame_handler, NULL);
38 _Exit(-1);
39 }
40
41 int* faultyPointer = NULL;
42
crashing_leaf_func(void)43 __attribute__((noinline)) void crashing_leaf_func(void) {
44 *faultyPointer = 0;
45 }
46
main(int,char **)47 int main(int, char**) {
48 signal(SIGSEGV, signal_handler);
49 crashing_leaf_func();
50 return -2;
51 }