libbacktrace/edtest.c

   1 /* edtest.c -- Test for libbacktrace storage allocation stress handling
   2    Copyright (C) 2017-2018 Free Software Foundation, Inc.
   3
   4 Redistribution and use in source and binary forms, with or without
   5 modification, are permitted provided that the following conditions are
   6 met:
   7
   8     (1) Redistributions of source code must retain the above copyright
   9     notice, this list of conditions and the following disclaimer.
  10
  11     (2) Redistributions in binary form must reproduce the above copyright
  12     notice, this list of conditions and the following disclaimer in
  13     the documentation and/or other materials provided with the
  14     distribution.
  15
  16     (3) The name of the author may not be used to
  17     endorse or promote products derived from this software without
  18     specific prior written permission.
  19
  20 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  21 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  22 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  23 DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  24 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  25 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  26 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  28 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  29 IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30 POSSIBILITY OF SUCH DAMAGE.  */
  31
  32 #include "config.h"
  33
  34 #include <assert.h>
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <sys/types.h>
  39
  40 #include "backtrace.h"
  41 #include "backtrace-supported.h"
  42 #include "internal.h"
  43
  44 #include "testlib.h"
  45
  46 static int test1 (void) __attribute__ ((noinline, unused));
  47 static int test1 (void) __attribute__ ((noinline, unused));
  48 extern int f2 (int);
  49 extern int f3 (int, int);
  50
  51 static int
  52 test1 (void)
  53 {
  54   /* Returning a value here and elsewhere avoids a tailcall which
  55      would mess up the backtrace.  */
  56   return f2 (__LINE__) + 1;
  57 }
  58
  59 int
  60 f3 (int f1line, int f2line)
  61 {
  62   struct info all[20];
  63   struct bdata data;
  64   int f3line;
  65   int i;
  66
  67   data.all = &all[0];
  68   data.index = 0;
  69   data.max = 20;
  70   data.failed = 0;
  71
  72   f3line = __LINE__ + 1;
  73   i = backtrace_full (state, 0, callback_one, error_callback_one, &data);
  74
  75   if (i != 0)
  76     {
  77       fprintf (stderr, "test1: unexpected return value %d\n", i);
  78       data.failed = 1;
  79     }
  80
  81   if (data.index < 3)
  82     {
  83       fprintf (stderr,
  84                "test1: not enough frames; got %zu, expected at least 3\n",
  85                data.index);
  86       data.failed = 1;
  87     }
  88
  89   check ("test1", 0, all, f3line, "f3", "edtest.c", &data.failed);
  90   check ("test1", 1, all, f2line, "f2", "edtest2_build.c", &data.failed);
  91   check ("test1", 2, all, f1line, "test1", "edtest.c", &data.failed);
  92
  93   printf ("%s: backtrace_full alloc stress\n", data.failed ? "FAIL" : "PASS");
  94
  95   if (data.failed)
  96     ++failures;
  97
  98   return failures;
  99 }
 100
 101 int
 102 main (int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
 103 {
 104   state = backtrace_create_state (argv[0], BACKTRACE_SUPPORTS_THREADS,
 105                                   error_callback_create, NULL);
 106
 107   // Grab the storage allocation lock prior to doing anything interesting.
 108   // The intent here is to insure that the backtrace_alloc code is forced
 109   // to always call mmap() for new memory as opposed to reusing previously
 110   // allocated memory from the free list. Doing things this way helps
 111   // simulate what you might see in a multithreaded program in which there
 112   // are racing calls to the allocator.
 113   struct backtrace_state *state_internal =
 114       (struct backtrace_state *) state;
 115   state_internal->lock_alloc = 1;
 116
 117   // Kick off the test
 118   test1();
 119
 120   exit (failures > 0 ? EXIT_FAILURE : EXIT_SUCCESS);
 121 }