mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
/* Test program to trigger mcount overflow in profiling collection.
|
|
Copyright (C) 2017-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
/* Program with sufficiently complex, yet pointless, call graph
|
|
that it will trigger an mcount overflow, when you set the
|
|
minarcs/maxarcs tunables to very low values. */
|
|
|
|
#define PREVENT_TAIL_CALL asm volatile ("")
|
|
|
|
/* Calls REP(n) macro 16 times, for n=0..15.
|
|
* You need to define REP(n) before using this.
|
|
*/
|
|
#define REPS \
|
|
REP(0) REP(1) REP(2) REP(3) REP(4) REP(5) REP(6) REP(7) \
|
|
REP(8) REP(9) REP(10) REP(11) REP(12) REP(13) REP(14) REP(15)
|
|
|
|
/* Defines 16 leaf functions named f1_0 to f1_15 */
|
|
#define REP(n) \
|
|
__attribute__ ((noinline, noclone, weak)) void f1_##n (void) {};
|
|
REPS
|
|
#undef REP
|
|
|
|
/* Calls all 16 leaf functions f1_* in succession */
|
|
__attribute__ ((noinline, noclone, weak)) void
|
|
f2 (void)
|
|
{
|
|
# define REP(n) f1_##n();
|
|
REPS
|
|
# undef REP
|
|
PREVENT_TAIL_CALL;
|
|
}
|
|
|
|
/* Defines 16 functions named f2_0 to f2_15, which all just call f2 */
|
|
#define REP(n) \
|
|
__attribute__ ((noinline, noclone, weak)) void \
|
|
f2_##n (void) { f2(); PREVENT_TAIL_CALL; };
|
|
REPS
|
|
#undef REP
|
|
|
|
__attribute__ ((noinline, noclone, weak)) void
|
|
f3 (int count)
|
|
{
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
/* Calls f1_0(), f2_0(), f1_1(), f2_1(), f3_0(), etc */
|
|
# define REP(n) f1_##n(); f2_##n();
|
|
REPS
|
|
# undef REP
|
|
}
|
|
}
|
|
|
|
int
|
|
main (void)
|
|
{
|
|
f3 (1000);
|
|
return 0;
|
|
}
|