gold/testsuite/initpri3.c

   1 /* initpri3.c -- test ctor odering when using init_array.
   2
   3    Copyright (C) 2011-2021 Free Software Foundation, Inc.
   4    Written by Ian Lance Taylor <iant@google.com>.
   5
   6    This file is part of gold.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21    MA 02110-1301, USA.  */
  22
  23 /* This tests that the linker correctly orders .ctor entries when
  24    putting them into .init_array, as is the default.  */
  25
  26 #include <assert.h>
  27
  28 int i = 1;
  29
  30 static void
  31 ctor1 (void)
  32 {
  33   assert (i == 1);
  34   i = 2;
  35 }
  36
  37 static void
  38 ctor2 (void)
  39 {
  40   assert (i == 2);
  41   i = 3;
  42 }
  43
  44 static void
  45 dtor1 (void)
  46 {
  47   assert (i == 3);
  48   i = 2;
  49 }
  50
  51 static void
  52 dtor2 (void)
  53 {
  54   assert (i == 2);
  55   i = 1;
  56 }
  57
  58 /* The .ctors section is run in reverse order, the .dtors section in
  59    run in forward order.  We give these arrays the "aligned" attribute
  60    because the x86_64 ABI would otherwise give them a 16-byte
  61    alignment, which may leave a hole in the section.  */
  62
  63 void (*ctors[]) (void)
  64   __attribute__ ((aligned (4), section (".ctors"))) = {
  65   ctor2,
  66   ctor1
  67 };
  68
  69 void (*dtors[]) (void)
  70   __attribute__ ((aligned (4), section (".dtors"))) = {
  71   dtor1,
  72   dtor2
  73 };
  74
  75 int
  76 main (void)
  77 {
  78   assert (i == 3);
  79   return 0;
  80 }