1 /*
2 * This file is part of ltrace.
3 * Copyright (C) 2012 Petr Machata, Red Hat Inc.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of the
8 * License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
18 * 02110-1301 USA
19 */
20
21 /* This is specially made to produce tail calls. We then trace them
22 * and see if ltrace handles it well, or whether its internal stack
23 * overflows. */
24
25 __attribute__((noinline, optimize(3))) int
func3(int i)26 func3(int i)
27 {
28 return i + 1;
29 }
30
31 __attribute__((noinline, optimize(3))) int
func2(int i)32 func2(int i)
33 {
34 return func3(i * 3);
35 }
36
37 __attribute__((noinline, optimize(3))) int
func1(int i)38 func1(int i)
39 {
40 return func2(i + 2);
41 }
42
43 __attribute__((optimize(0))) int
main(int argc,char ** argv)44 main(int argc, char **argv)
45 {
46 int counter = 0;
47 int i;
48 for (i = 0; i < 100; ++i)
49 counter += func1(i);
50 return counter;
51 }
52