gold/testsuite/constructor_test.cc

   1 // constructor_test.cc -- a test case for gold global constructors
   2
   3 // Copyright (C) 2006-2021 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 file just runs some global constructors and destructors.  The
  24 // last global destructor verifies that the state is as expected, and
  25 // we assume that it runs correctly itself.
  26
  27 #include <cassert>
  28 #include <cstdlib>
  29
  30 // These counters let us verify the state.
  31
  32 int c1_count;
  33 int c2_count;
  34 int atexit_count;
  35
  36 // This class verifies that there are no objects left when it is
  37 // destroyed.  Therefore, we can only have one instance of this
  38 // object.
  39
  40 class c1
  41 {
  42  public:
  43   static int count;
  44
  45   c1()
  46   { ++c1_count; }
  47
  48   ~c1()
  49   {
  50     --c1_count;
  51     assert(c1_count == 0 && c2_count == 0 && atexit_count == 0);
  52   }
  53 };
  54
  55 c1 c1v;
  56
  57 // A function called at atexit time.
  58
  59 void
  60 atexit_function()
  61 {
  62   --atexit_count;
  63   assert(atexit_count == c2_count);
  64 }
  65
  66 // A class which counts itself and also calls atexit.
  67
  68 class c2
  69 {
  70  public:
  71   c2()
  72   {
  73     assert(atexit_count == c2_count);
  74     ++c2_count;
  75     atexit(atexit_function);
  76     ++atexit_count;
  77   }
  78
  79   ~c2()
  80   { --c2_count; }
  81 };
  82
  83 c2 c2v1;
  84 c2 c2v2;
  85
  86 int
  87 main()
  88 {
  89   return 0;
  90 }