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      1 /* libunwind - a platform-independent unwind library
      2    Copyright (C) 2002-2003 Hewlett-Packard Co
      3 	Contributed by David Mosberger-Tang <davidm (at) hpl.hp.com>
      4 
      5 This file is part of libunwind.
      6 
      7 Permission is hereby granted, free of charge, to any person obtaining
      8 a copy of this software and associated documentation files (the
      9 "Software"), to deal in the Software without restriction, including
     10 without limitation the rights to use, copy, modify, merge, publish,
     11 distribute, sublicense, and/or sell copies of the Software, and to
     12 permit persons to whom the Software is furnished to do so, subject to
     13 the following conditions:
     14 
     15 The above copyright notice and this permission notice shall be
     16 included in all copies or substantial portions of the Software.
     17 
     18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     21 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     24 WITH 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 #include "compiler.h"
     35 
     36 int verbose, errors;
     37 
     38 #define panic(args...)					\
     39 	{ ++errors; fprintf (stderr, args); return; }
     40 
     41 class Test_Class {
     42   public:
     43   Test_Class (void);
     44 };
     45 
     46 static Test_Class t;
     47 
     48 static void
     49 do_backtrace (void)
     50 {
     51   char name[128], off[32];
     52   unw_word_t ip, offset;
     53   unw_cursor_t cursor;
     54   unw_context_t uc;
     55   int ret, count = 0;
     56 
     57   unw_getcontext (&uc);
     58   unw_init_local (&cursor, &uc);
     59 
     60   do
     61     {
     62       unw_get_reg (&cursor, UNW_REG_IP, &ip);
     63       name[0] = '\0';
     64       off[0] = '\0';
     65       if (unw_get_proc_name (&cursor, name, sizeof (name), &offset) == 0
     66 	  && offset > 0)
     67 	snprintf (off, sizeof (off), "+0x%lx", (long) offset);
     68       if (verbose)
     69 	printf ("  [%lx] <%s%s>\n", (long) ip, name, off);
     70       if (++count > 32)
     71 	panic ("FAILURE: didn't reach beginning of unwind-chain\n");
     72     }
     73   while ((ret = unw_step (&cursor)) > 0);
     74 
     75   if (ret < 0)
     76     panic ("FAILURE: unw_step() returned %d\n", ret);
     77 }
     78 
     79 static void
     80 b (void)
     81 {
     82   do_backtrace();
     83 }
     84 
     85 static void
     86 a (void)
     87 {
     88   if (verbose)
     89     printf ("do_backtrace() from atexit()-handler:\n");
     90   b();
     91   if (errors)
     92     abort ();	/* cannot portably call exit() from an atexit() handler */
     93 }
     94 
     95 Test_Class::Test_Class (void)
     96 {
     97   if (verbose)
     98     printf ("do_backtrace() from constructor:\n");
     99   b();
    100 }
    101 
    102 int
    103 main (int argc, char **argv UNUSED)
    104 {
    105   verbose = argc > 1;
    106   return atexit (a);
    107 }
    108