debug/tst-backtrace3.c

   1 /* Test backtrace and backtrace_symbols for recursive calls.
   2    Copyright (C) 2010-2016 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <execinfo.h>
  20 #include <search.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "tst-backtrace.h"
  26
  27 static int do_test (void);
  28 #define TEST_FUNCTION do_test ()
  29 #include "../test-skeleton.c"
  30
  31 /* The backtrace should include at least 3 * fn, and do_test.  */
  32 #define NUM_FUNCTIONS 4
  33
  34 NO_INLINE int
  35 fn (int c)
  36 {
  37   void *addresses[NUM_FUNCTIONS];
  38   char **symbols;
  39   int n;
  40   int i;
  41
  42   if (c > 0)
  43     {
  44       fn (c - 1);
  45       return x;
  46     }
  47   /* Get the backtrace addresses.  */
  48   n = backtrace (addresses, sizeof (addresses) / sizeof (addresses[0]));
  49   printf ("Obtained backtrace with %d functions\n", n);
  50   /*  Check that there are at least four functions.  */
  51   if (n < NUM_FUNCTIONS)
  52     {
  53       FAIL ();
  54       return 1;
  55     }
  56   /* Convert them to symbols.  */
  57   symbols = backtrace_symbols (addresses, n);
  58   /* Check that symbols were obtained.  */
  59   if (symbols == NULL)
  60     {
  61       FAIL ();
  62       return 1;
  63     }
  64   for (i = 0; i < n; ++i)
  65     printf ("Function %d: %s\n", i, symbols[i]);
  66   /* Check that the function names obtained are accurate.  */
  67   for (i = 0; i < n - 1; ++i)
  68     if (!match (symbols[i], "fn"))
  69       {
  70         FAIL ();
  71         return 1;
  72       }
  73   /* Symbol names are not available for static functions, so we do not
  74      check do_test.  */
  75   return x;
  76 }
  77
  78 NO_INLINE static int
  79 do_test (void)
  80 {
  81   fn (2);
  82   return ret;
  83 }