libstdc++-v3/testsuite/20_util/allocator/overaligned.cc

   1 // Copyright (C) 2016-2023 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-options "-faligned-new" }
  19 // { dg-do run { target { c++11 && { c++17 || std_allocator_new } } } }
  20 // { dg-require-cstdint "" }
  21 // { dg-require-effective-target hosted }
  22
  23 #include <memory>
  24 #include <cstddef>
  25 #include <cstdint>
  26 #include <testsuite_hooks.h>
  27
  28 constexpr std::size_t align = alignof(std::max_align_t) * 4;
  29
  30 struct X {
  31   alignas(align) char c;
  32 };
  33
  34 void
  35 test01()
  36 {
  37   std::allocator<X> a;
  38   X* p1 = a.allocate(1);
  39   VERIFY( (reinterpret_cast<std::uintptr_t>(p1) % align) == 0 );
  40   a.deallocate(p1, 1);
  41   X* p2 = a.allocate(20);
  42   VERIFY( (reinterpret_cast<std::uintptr_t>(p2) % align) == 0 );
  43   a.deallocate(p2, 20);
  44 }
  45
  46 int
  47 main()
  48 {
  49   test01();
  50 }