libstdc++-v3/testsuite/util/replacement_memory_operators.h

   1 //
   2 // Copyright (C) 2007-2025 Free Software Foundation, Inc.
   3 //
   4 // This file is part of the GNU ISO C++ Library.  This library is free
   5 // software; you can redistribute it and/or modify it under the
   6 // terms of the GNU General Public License as published by the
   7 // Free Software Foundation; either version 3, or (at your option)
   8 // any later version.
   9 //
  10 // This library is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License along
  16 // with this library; see the file COPYING3.  If not see
  17 // <http://www.gnu.org/licenses/>.
  18
  19 #include <exception>
  20 #include <stdexcept>
  21 #include <cstdlib>
  22 #include <cstdio>
  23 #include <testsuite_hooks.h>
  24
  25 namespace __gnu_test
  26 {
  27   struct counter_error : public std::exception { };
  28
  29   struct counter
  30   {
  31     std::size_t _M_count;
  32     std::size_t _M_increments, _M_decrements;
  33     bool        _M_throw;
  34
  35     counter() : _M_count(0), _M_throw(true) { }
  36
  37     ~counter() THROW (counter_error)
  38     {
  39       if (_M_throw && _M_count != 0)
  40         throw counter_error();
  41     }
  42
  43     static void
  44     increment()
  45     {
  46       counter& cntr = get();
  47       cntr._M_count++;
  48       cntr._M_increments++;
  49     }
  50
  51     static void
  52     decrement()
  53     {
  54       counter& cntr = get();
  55       cntr._M_count--;
  56       cntr._M_decrements++;
  57     }
  58
  59     static counter&
  60     get()
  61     {
  62       static counter g;
  63       return g;
  64     }
  65
  66     static std::size_t
  67     count() { return get()._M_count; }
  68
  69     static void
  70     exceptions(bool __b) { get()._M_throw = __b; }
  71
  72     static void
  73     reset()
  74     {
  75       counter& cntr = get();
  76       cntr._M_increments = cntr._M_decrements = 0;
  77     }
  78
  79     struct scope
  80     {
  81       scope() : _M_count(counter::count())
  82       { counter::get()._M_count = 0; }
  83       ~scope()
  84       { counter::get()._M_count = _M_count; }
  85
  86     private:
  87       std::size_t _M_count;
  88
  89 #if __cplusplus >= 201103L
  90       scope(const scope&) = delete;
  91       scope& operator=(const scope&) = delete;
  92 #else
  93       scope(const scope&);
  94       scope& operator=(const scope&);
  95 #endif
  96     };
  97   };
  98
  99   template<typename Alloc, bool uses_global_new>
 100     bool
 101     check_new(Alloc a = Alloc())
 102     {
 103       __gnu_test::counter::scope s;
 104       __gnu_test::counter::exceptions(false);
 105       (void) a.allocate(10);
 106       const bool __b((__gnu_test::counter::count() > 0) == uses_global_new);
 107       if (!__b)
 108         throw std::logic_error("counter not incremented");
 109       return __b;
 110     }
 111
 112   template<typename Alloc, bool uses_global_delete>
 113     bool
 114     check_delete(Alloc a = Alloc())
 115     {
 116       __gnu_test::counter::exceptions(false);
 117 #if __cplusplus >= 201103L
 118       auto p = a.allocate(10);
 119 #else
 120       typename Alloc::pointer p = a.allocate(10);
 121 #endif
 122       const std::size_t count1 = __gnu_test::counter::count();
 123       a.deallocate(p, 10);
 124       const std::size_t count2 = __gnu_test::counter::count();
 125       const bool __b((count2 < count1) == uses_global_delete);
 126       if (!__b)
 127         throw std::logic_error("counter not decremented");
 128       return __b;
 129     }
 130 } // namespace __gnu_test
 131
 132 void* operator new(std::size_t size) THROW(std::bad_alloc)
 133 {
 134   std::printf("operator new is called \n");
 135   void* p = std::malloc(size);
 136   if (!p)
 137     throw std::bad_alloc();
 138   __gnu_test::counter::increment();
 139   return p;
 140 }
 141
 142 void operator delete(void* p) throw()
 143 {
 144   std::printf("operator delete is called \n");
 145   if (p)
 146     {
 147       std::free(p);
 148       __gnu_test::counter::decrement();
 149
 150       std::size_t count = __gnu_test::counter::count();
 151       if (count == 0)
 152         std::printf("All memory released \n");
 153       else
 154         std::printf("%lu allocations to be released \n", (unsigned long)count);
 155     }
 156 }
 157
 158 #if __cpp_sized_deallocation
 159 void operator delete(void* p, std::size_t) throw() { ::operator delete(p); }
 160 #endif