libstdc++-v3/testsuite/20_util/monotonic_buffer_resource/deallocate.cc

   1 // Copyright (C) 2018-2020 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 "-std=gnu++17" }
  19 // { dg-do run { target c++17 } }
  20 // { dg-require-cstdint "" }
  21
  22 #include <memory_resource>
  23 #include <testsuite_allocator.h>
  24
  25 struct resource : __gnu_test::memory_resource
  26 {
  27   int allocate_calls = 0;
  28   int deallocate_calls = 0;
  29
  30   void*
  31   do_allocate(std::size_t bytes, std::size_t align) override
  32   {
  33     ++allocate_calls;
  34     return __gnu_test::memory_resource::do_allocate(bytes, align);
  35   }
  36
  37   void
  38   do_deallocate(void* p, std::size_t bytes, std::size_t align) override
  39   {
  40     ++deallocate_calls;
  41     __gnu_test::memory_resource::do_deallocate(p, bytes, align);
  42   }
  43 };
  44
  45 void
  46 test01()
  47 {
  48   resource r;
  49
  50   // test that it's possible to deallocate after each of the constructors
  51   {
  52     std::pmr::monotonic_buffer_resource mr(&r);
  53     auto p = mr.allocate(1024);
  54     VERIFY( p != nullptr );
  55     const std::uintptr_t pi = reinterpret_cast<std::uintptr_t>(p);
  56     mr.deallocate(p, 1024);
  57     VERIFY( r.deallocate_calls == 0 );
  58     auto q = mr.allocate(1024);
  59     VERIFY( q != nullptr );
  60     VERIFY( pi != reinterpret_cast<std::uintptr_t>(q) );
  61     mr.deallocate(q, 1024);
  62     VERIFY( r.deallocate_calls == 0 );
  63   }
  64   VERIFY( r.deallocate_calls == r.allocate_calls );
  65   VERIFY( r.number_of_active_allocations() == 0 );
  66   {
  67     r.deallocate_calls = r.allocate_calls = 0;
  68     std::pmr::monotonic_buffer_resource mr(128, &r);
  69     auto p = mr.allocate(64);
  70     VERIFY( p != nullptr );
  71     const std::uintptr_t pi = reinterpret_cast<std::uintptr_t>(p);
  72     mr.deallocate(p, 64);
  73     auto q = mr.allocate(1024);
  74     VERIFY( q != nullptr );
  75     VERIFY( p != q );
  76     VERIFY( pi != reinterpret_cast<std::uintptr_t>(q) );
  77     mr.deallocate(q, 1024);
  78     VERIFY( r.deallocate_calls == 0 );
  79   }
  80   VERIFY( r.number_of_active_allocations() == 0 );
  81   {
  82     r.deallocate_calls = r.allocate_calls = 0;
  83     unsigned char buf[64];
  84     std::pmr::monotonic_buffer_resource mr((void*)buf, sizeof(buf), &r);
  85     auto p = mr.allocate(64);
  86     VERIFY( p != nullptr );
  87     const std::uintptr_t pi = reinterpret_cast<std::uintptr_t>(p);
  88     mr.deallocate(p, 64);
  89     auto q = mr.allocate(1024);
  90     VERIFY( q != nullptr );
  91     VERIFY( p != q );
  92     VERIFY( pi != reinterpret_cast<std::uintptr_t>(q) );
  93     mr.deallocate(q, 1024);
  94     VERIFY( r.deallocate_calls == 0 );
  95   }
  96   VERIFY( r.deallocate_calls == r.allocate_calls );
  97   VERIFY( r.number_of_active_allocations() == 0 );
  98 }
  99
 100 int
 101 main()
 102 {
 103   test01();
 104 }