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