ttest.c

/* ttest.c -- Test for libbacktrace library
   Copyright (C) 2017-2021 Free Software Foundation, Inc.
   Written by Ian Lance Taylor, Google.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    (1) Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.

    (2) Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in
    the documentation and/or other materials provided with the
    distribution.

    (3) The name of the author may not be used to
    endorse or promote products derived from this software without
    specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.  */

/* Test using the libbacktrace library from multiple threads.  */

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <pthread.h>

#include "filenames.h"

#include "backtrace.h"
#include "backtrace-supported.h"

#include "testlib.h"

static int f2 (int) __attribute__ ((noinline));
static int f3 (int, int) __attribute__ ((noinline));

/* Test that a simple backtrace works.  This is called via
   pthread_create.  It returns the number of failures, as void *.  */

static void *
test1_thread (void *arg ATTRIBUTE_UNUSED)
{
  /* Returning a value here and elsewhere avoids a tailcall which
     would mess up the backtrace.  */
  return (void *) (uintptr_t) (f2 (__LINE__) - 2);
}

static int
f2 (int f1line)
{
  return f3 (f1line, __LINE__) + 2;
}

static int
f3 (int f1line, int f2line)
{
  struct info all[20];
  struct bdata data;
  int f3line;
  int i;

  data.all = &all[0];
  data.index = 0;
  data.max = 20;
  data.failed = 0;

  f3line = __LINE__ + 1;
  i = backtrace_full (state, 0, callback_one, error_callback_one, &data);

  if (i != 0)
    {
      fprintf (stderr, "test1: unexpected return value %d\n", i);
      data.failed = 1;
    }

  if (data.index < 3)
    {
      fprintf (stderr,
	       "test1: not enough frames; got %zu, expected at least 3\n",
	       data.index);
      data.failed = 1;
    }

  check ("test1", 0, all, f3line, "f3", "ttest.c", &data.failed);
  check ("test1", 1, all, f2line, "f2", "ttest.c", &data.failed);
  check ("test1", 2, all, f1line, "test1_thread", "ttest.c", &data.failed);

  return data.failed;
}

/* Run the test with 10 threads simultaneously.  */

#define THREAD_COUNT 10

static void test1 (void) __attribute__ ((unused));

static void
test1 (void)
{
  pthread_t atid[THREAD_COUNT];
  int i;
  int errnum;
  int this_fail;
  void *ret;

  for (i = 0; i < THREAD_COUNT; i++)
    {
      errnum = pthread_create (&atid[i], NULL, test1_thread, NULL);
      if (errnum != 0)
	{
	  fprintf (stderr, "pthread_create %d: %s\n", i, strerror (errnum));
	  exit (EXIT_FAILURE);
	}
    }

  this_fail = 0;
  for (i = 0; i < THREAD_COUNT; i++)
    {
      errnum = pthread_join (atid[i], &ret);
      if (errnum != 0)
	{
	  fprintf (stderr, "pthread_join %d: %s\n", i, strerror (errnum));
	  exit (EXIT_FAILURE);
	}
      this_fail += (int) (uintptr_t) ret;
    }

  printf ("%s: threaded backtrace_full noinline\n", this_fail > 0 ? "FAIL" : "PASS");

  failures += this_fail;
}

int
main (int argc ATTRIBUTE_UNUSED, char **argv)
{
  state = backtrace_create_state (argv[0], BACKTRACE_SUPPORTS_THREADS,
				  error_callback_create, NULL);

#if BACKTRACE_SUPPORTED
#if BACKTRACE_SUPPORTS_THREADS
  test1 ();
#endif
#endif

  exit (failures ? EXIT_FAILURE : EXIT_SUCCESS);
}