/* Test backtrace and backtrace_symbols.

   Copyright (C) 2009-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <execinfo.h>

#include <search.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "tst-backtrace.h"

/* The backtrace should include at least f1, f2, f3, and do_test.  */

#define NUM_FUNCTIONS 4

NO_INLINE void

fn1 (void)

{

  void *addresses[NUM_FUNCTIONS];

  char **symbols;

  int n;

  int i;

  /* Get the backtrace addresses.  */

  n = backtrace (addresses, sizeof (addresses) / sizeof (addresses[0]));

  printf ("Obtained backtrace with %d functions\n", n);

  /*  Check that there are at least four functions.  */

  if (n < NUM_FUNCTIONS)

    {

      FAIL ();

      return;

    }

  /* Convert them to symbols.  */

  symbols = backtrace_symbols (addresses, n);

  /* Check that symbols were obtained.  */

  if (symbols == NULL)

    {

      FAIL ();

      return;

    }

  for (i = 0; i < n; ++i)

    printf ("Function %d: %s\n", i, symbols[i]);

  /* Check that the function names obtained are accurate.  */

  if (!match (symbols[0], "fn1"))

    {

      FAIL ();

      return;

    }

  /* Symbol names are not available for static functions, so we do not

     check f2.  */

  if (!match (symbols[2], "fn3"))

    {

      FAIL ();

      return;

    }

  /* Symbol names are not available for static functions, so we do not

     check do_test.  */

}

NO_INLINE int

fn2 (void)

{

  fn1 ();

  /* Prevent tail calls.  */

  return x;

}

NO_INLINE int

fn3 (void)

{

  fn2();

  /* Prevent tail calls.  */

  return x;

}

NO_INLINE int

do_test (void)

{

  /* Test BZ #18084.  */

  void *buffer[1];

  if (backtrace (buffer, 0) != 0)

    FAIL ();

  fn3 ();

  return ret;

}

#include <support/test-driver.c>