root/maint/gnulib/tests/test-alloca-opt.c

/* */

DEFINITIONS

1. do_allocation
2. main

   1 /* Test of optional automatic memory allocation.
   2    Copyright (C) 2005, 2007, 2009-2021 Free Software Foundation, Inc.
   3 
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8 
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13 
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16 
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
  18 
  19 #include <config.h>
  20 
  21 #include <alloca.h>
  22 
  23 #if HAVE_ALLOCA
  24 
  25 static void
  26 do_allocation (int n)
     /*  */
  27 {
  28   void *volatile ptr = alloca (n);
  29   (void) ptr;
  30 }
  31 
  32 void (*func) (int) = do_allocation;
  33 
  34 #endif
  35 
  36 int
  37 main ()
     /*  */
  38 {
  39 #if HAVE_ALLOCA
  40   int i;
  41 
  42   /* Repeat a lot of times, to make sure there's no memory leak.  */
  43   for (i = 0; i < 100000; i++)
  44     {
  45       /* Try various values.
  46          n = 0 gave a crash on Alpha with gcc-2.5.8.
  47          Some versions of Mac OS X have a stack size limit of 512 KB.  */
  48       func (34);
  49       func (134);
  50       func (399);
  51       func (510823);
  52       func (129321);
  53       func (0);
  54       func (4070);
  55       func (4095);
  56       func (1);
  57       func (16582);
  58     }
  59 #endif
  60 
  61   return 0;
  62 }

/* */