gdb/testsuite/gdb.arch/amd64-tailcall-self.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2015-2019 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program 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
  13    GNU 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, see <http://www.gnu.org/licenses/>.  */
  17
  18 __attribute__((noinline,noclone)) static void b(void) {
  19   asm volatile("");
  20 }
  21
  22 int i;
  23
  24 __attribute__((noinline,noclone)) int c(int q) {
  25   return q+1;
  26 }
  27
  28 __attribute__((noinline,noclone)) void a(int q) {
  29   asm volatile("nop;nop;nop"::"g"(q):"memory");
  30   if (i>=1&&i<=10) {
  31     i|=1;
  32     a(i);
  33   } else if (i==0)
  34     b();
  35 }
  36
  37 int main(int argc,char **argv) {
  38   a(argc);
  39   return 0;
  40 }