debug/tst-backtrace2.c

   1 /* Test backtrace and backtrace_symbols.
   2    Copyright (C) 2009-2019 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    <https://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 /* The backtrace should include at least f1, f2, f3, and do_test.  */
  28 #define NUM_FUNCTIONS 4
  29
  30 NO_INLINE void
  31 fn1 (void)
  32 {
  33   void *addresses[NUM_FUNCTIONS];
  34   char **symbols;
  35   int n;
  36   int i;
  37
  38   /* Get the backtrace addresses.  */
  39   n = backtrace (addresses, sizeof (addresses) / sizeof (addresses[0]));
  40   printf ("Obtained backtrace with %d functions\n", n);
  41   /*  Check that there are at least four functions.  */
  42   if (n < NUM_FUNCTIONS)
  43     {
  44       FAIL ();
  45       return;
  46     }
  47   /* Convert them to symbols.  */
  48   symbols = backtrace_symbols (addresses, n);
  49   /* Check that symbols were obtained.  */
  50   if (symbols == NULL)
  51     {
  52       FAIL ();
  53       return;
  54     }
  55   for (i = 0; i < n; ++i)
  56     printf ("Function %d: %s\n", i, symbols[i]);
  57   /* Check that the function names obtained are accurate.  */
  58   if (!match (symbols[0], "fn1"))
  59     {
  60       FAIL ();
  61       return;
  62     }
  63   /* Symbol names are not available for static functions, so we do not
  64      check f2.  */
  65   if (!match (symbols[2], "fn3"))
  66     {
  67       FAIL ();
  68       return;
  69     }
  70   /* Symbol names are not available for static functions, so we do not
  71      check do_test.  */
  72 }
  73
  74 NO_INLINE int
  75 fn2 (void)
  76 {
  77   fn1 ();
  78   /* Prevent tail calls.  */
  79   return x;
  80 }
  81
  82 NO_INLINE int
  83 fn3 (void)
  84 {
  85   fn2();
  86   /* Prevent tail calls.  */
  87   return x;
  88 }
  89
  90 NO_INLINE int
  91 do_test (void)
  92 {
  93   /* Test BZ #18084.  */
  94   void *buffer[1];
  95
  96   if (backtrace (buffer, 0) != 0)
  97     FAIL ();
  98
  99   fn3 ();
 100   return ret;
 101 }
 102
 103 #include <support/test-driver.c>