gmon/tst-gmon.c

   1 /* Test program for profiling information collection (_mcount/gprof).
   2    Copyright (C) 2017 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    <http://www.gnu.org/licenses/>.  */
  18
  19 /* This program does not use the test harness because we want tight
  20    control over the call graph.  */
  21
  22 __attribute__ ((noinline, noclone, weak)) void
  23 f1 (void)
  24 {
  25 }
  26
  27 __attribute__ ((noinline, noclone, weak)) void
  28 f2 (void)
  29 {
  30   f1 ();
  31   /* Prevent tail call.  */
  32   asm volatile ("");
  33 }
  34
  35 __attribute__ ((noinline, noclone, weak)) void
  36 f3 (int count)
  37 {
  38   for (int i = 0; i < count; ++i)
  39     {
  40       f1 ();
  41       f2 ();
  42     }
  43 }
  44
  45 int
  46 main (void)
  47 {
  48   f3 (1000);
  49   return 0;
  50 }