libstdc++-v3/testsuite/ext/malloc_allocator/overaligned.cc

   1 // Copyright (C) 2016-2019 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 } }
  20 // { dg-require-cstdint "" }
  21
  22 #include <ext/malloc_allocator.h>
  23 #include <cstddef>
  24 #include <cstdint>
  25 #include <testsuite_hooks.h>
  26
  27 constexpr std::size_t align = alignof(std::max_align_t) * 2;
  28
  29 struct X {
  30   alignas(align) char c;
  31 };
  32
  33 void
  34 test01()
  35 {
  36   __gnu_cxx::malloc_allocator<X> a;
  37 #if __cplusplus > 201402L && _GLIBCXX_HAVE_ALIGNED_ALLOC
  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 #else
  45   // Allocating for extended alignment is unreliable without aligned_alloc()
  46   try
  47   {
  48     X* p1 = a.allocate(1);
  49     VERIFY( (reinterpret_cast<std::uintptr_t>(p1) % align) == 0 );
  50     a.deallocate(p1, 1);
  51   }
  52   catch (const std::bad_alloc&)
  53   { }
  54   try
  55   {
  56     X* p2 = a.allocate(20);
  57     VERIFY( (reinterpret_cast<std::uintptr_t>(p2) % align) == 0 );
  58     a.deallocate(p2, 20);
  59   }
  60   catch (const std::bad_alloc&)
  61   { }
  62 #endif
  63 }
  64
  65 int
  66 main()
  67 {
  68   test01();
  69 }