Gtest-init.cxx revision a4ab1098ea2b47aef9c6b684580849db18fec874 
1/* libunwind - a platform-independent unwind library
2   Copyright (C) 2002-2003 Hewlett-Packard Co
3	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
4
5This file is part of libunwind.
6
7Permission is hereby granted, free of charge, to any person obtaining
8a copy of this software and associated documentation files (the
9"Software"), to deal in the Software without restriction, including
10without limitation the rights to use, copy, modify, merge, publish,
11distribute, sublicense, and/or sell copies of the Software, and to
12permit persons to whom the Software is furnished to do so, subject to
13the following conditions:
14
15The above copyright notice and this permission notice shall be
16included in all copies or substantial portions of the Software.
17
18THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
22LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
25
26/* This file tests unwinding from a constructor from within an
27   atexit() handler.  */
28
29#include <stdio.h>
30#include <stdlib.h>
31#include <unistd.h>
32
33#include <libunwind.h>
34
35int errors;
36
37#define panic(args...)					\
38	{ ++errors; fprintf (stderr, args); return; }
39
40class Test_Class {
41  public:
42  Test_Class (void);
43};
44
45static Test_Class t;
46
47static void
48backtrace (void)
49{
50  char name[128], off[32];
51  unw_word_t ip, offset;
52  unw_cursor_t cursor;
53  unw_context_t uc;
54  int ret, count = 0;
55
56  unw_getcontext (&uc);
57  unw_init_local (&cursor, &uc);
58
59  do
60    {
61      unw_get_reg (&cursor, UNW_REG_IP, &ip);
62      name[0] = '\0';
63      off[0] = '\0';
64      if (unw_get_proc_name (&cursor, name, sizeof (name), &offset) == 0
65	  && off > 0)
66	snprintf (off, sizeof (off), "+0x%lx", (long) offset);
67      printf ("  [%lx] <%s%s>\n", (long) ip, name, off);
68      if (++count > 32)
69	panic ("FAILURE: didn't reach beginning of unwind-chain\n");
70    }
71  while ((ret = unw_step (&cursor)) > 0);
72
73  if (ret < 0)
74    panic ("FAILURE: unw_step() returned %d\n", ret);
75}
76
77static void
78b (void)
79{
80  backtrace();
81}
82
83static void
84a (void)
85{
86  printf ("backtrace() from atexit()-handler:\n");
87  b();
88  if (errors)
89    abort ();	/* cannot portably call exit() from an atexit() handler */
90}
91
92Test_Class::Test_Class (void)
93{
94  printf ("backtrace() from constructor:\n");
95  b();
96}
97
98int
99main (int argc, char **argv)
100{
101  return atexit (a);
102}
103