debug/tst-backtrace2.c

   1 /* Test backtrace and backtrace_symbols.
   2    Copyright (C) 2009-2016 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 f1, f2, f3, and do_test.  */
  32 #define NUM_FUNCTIONS 4
  33
  34 NO_INLINE void
  35 fn1 (void)
  36 {
  37   void *addresses[NUM_FUNCTIONS];
  38   char **symbols;
  39   int n;
  40   int i;
  41
  42   /* Get the backtrace addresses.  */
  43   n = backtrace (addresses, sizeof (addresses) / sizeof (addresses[0]));
  44   printf ("Obtained backtrace with %d functions\n", n);
  45   /*  Check that there are at least four functions.  */
  46   if (n < NUM_FUNCTIONS)
  47     {
  48       FAIL ();
  49       return;
  50     }
  51   /* Convert them to symbols.  */
  52   symbols = backtrace_symbols (addresses, n);
  53   /* Check that symbols were obtained.  */
  54   if (symbols == NULL)
  55     {
  56       FAIL ();
  57       return;
  58     }
  59   for (i = 0; i < n; ++i)
  60     printf ("Function %d: %s\n", i, symbols[i]);
  61   /* Check that the function names obtained are accurate.  */
  62   if (!match (symbols[0], "fn1"))
  63     {
  64       FAIL ();
  65       return;
  66     }
  67   /* Symbol names are not available for static functions, so we do not
  68      check f2.  */
  69   if (!match (symbols[2], "fn3"))
  70     {
  71       FAIL ();
  72       return;
  73     }
  74   /* Symbol names are not available for static functions, so we do not
  75      check do_test.  */
  76 }
  77
  78 NO_INLINE static int
  79 fn2 (void)
  80 {
  81   fn1 ();
  82   /* Prevent tail calls.  */
  83   return x;
  84 }
  85
  86 NO_INLINE int
  87 fn3 (void)
  88 {
  89   fn2();
  90   /* Prevent tail calls.  */
  91   return x;
  92 }
  93
  94 NO_INLINE static int
  95 do_test (void)
  96 {
  97   /* Test BZ #18084.  */
  98   void *buffer[1];
  99
 100   if (backtrace (buffer, 0) != 0)
 101     FAIL ();
 102
 103   fn3 ();
 104   return ret;
 105 }