libstdc++-v3/testsuite/testsuite_allocator.h

   1 // -*- C++ -*-
   2 // Testing allocator for the C++ library testsuite.
   3 //
   4 // Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 2, or (at your option)
  10 // any later version.
  11 //
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING.  If not, write to the Free
  19 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  20 // USA.
  21 //
  22 // As a special exception, you may use this file as part of a free software
  23 // library without restriction.  Specifically, if other files instantiate
  24 // templates or use macros or inline functions from this file, or you compile
  25 // this file and link it with other files to produce an executable, this
  26 // file does not by itself cause the resulting executable to be covered by
  27 // the GNU General Public License.  This exception does not however
  28 // invalidate any other reasons why the executable file might be covered by
  29 // the GNU General Public License.
  30
  31 // This file provides an test instrumentation allocator that can be
  32 // used to verify allocation functionality of standard library
  33 // containers.  2002.11.25 smw
  34
  35 #ifndef _GLIBCXX_TESTSUITE_ALLOCATOR_H
  36 #define _GLIBCXX_TESTSUITE_ALLOCATOR_H
  37
  38 #include <cstddef>
  39 #include <limits>
  40
  41 namespace
  42 {
  43   bool new_called = false;
  44   bool delete_called = false;
  45 };
  46
  47 namespace __gnu_test
  48 {
  49   class allocation_tracker
  50   {
  51   public:
  52     typedef std::size_t    size_type;
  53
  54     static void*
  55     allocate(size_type blocksize)
  56     {
  57       allocationTotal_ += blocksize;
  58       return ::operator new(blocksize);
  59     }
  60
  61     static void
  62     construct() { constructCount_++; }
  63
  64     static void
  65     destroy() { destructCount_++; }
  66
  67     static void
  68     deallocate(void* p, size_type blocksize)
  69     {
  70       ::operator delete(p);
  71       deallocationTotal_ += blocksize;
  72     }
  73
  74     static size_type
  75     allocationTotal() { return allocationTotal_; }
  76
  77     static size_type
  78     deallocationTotal() { return deallocationTotal_; }
  79
  80     static int
  81     constructCount() { return constructCount_; }
  82
  83     static int
  84     destructCount() { return destructCount_; }
  85
  86     static void
  87     resetCounts()
  88     {
  89       allocationTotal_ = 0;
  90       deallocationTotal_ = 0;
  91       constructCount_ = 0;
  92     destructCount_ = 0;
  93     }
  94
  95  private:
  96     static size_type  allocationTotal_;
  97     static size_type  deallocationTotal_;
  98     static int        constructCount_;
  99     static int        destructCount_;
 100   };
 101
 102   // A simple basic allocator that just forwards to the
 103   // allocation_tracker to fulfill memory requests.  This class is
 104   // templated on the target object type, but tracker isn't.
 105   template<class T>
 106   class tracker_alloc
 107   {
 108   public:
 109     typedef T              value_type;
 110     typedef T*             pointer;
 111     typedef const T*       const_pointer;
 112     typedef T&             reference;
 113     typedef const T&       const_reference;
 114     typedef std::size_t    size_type;
 115     typedef std::ptrdiff_t difference_type;
 116
 117     template<class U> struct rebind { typedef tracker_alloc<U> other; };
 118
 119     pointer
 120     address(reference value) const
 121     { return &value; }
 122
 123     const_pointer
 124     address(const_reference value) const
 125     { return &value; }
 126
 127     tracker_alloc() throw()
 128     { }
 129
 130     tracker_alloc(const tracker_alloc&) throw()
 131     { }
 132
 133     template<class U>
 134       tracker_alloc(const tracker_alloc<U>&) throw()
 135       { }
 136
 137     ~tracker_alloc() throw()
 138     { }
 139
 140     size_type
 141     max_size() const throw()
 142     { return std::numeric_limits<std::size_t>::max() / sizeof(T); }
 143
 144     pointer
 145     allocate(size_type n, const void* = 0)
 146     {
 147       return static_cast<pointer>(allocation_tracker::allocate(n * sizeof(T)));
 148     }
 149
 150     void
 151     construct(pointer p, const T& value)
 152     {
 153       new (p) T(value);
 154       allocation_tracker::construct();
 155     }
 156
 157     void
 158     destroy(pointer p)
 159     {
 160       p->~T();
 161       allocation_tracker::destroy();
 162     }
 163
 164     void
 165     deallocate(pointer p, size_type num)
 166     { allocation_tracker::deallocate(p, num * sizeof(T)); }
 167   };
 168
 169   template<class T1, class T2>
 170     bool
 171     operator==(const tracker_alloc<T1>&, const tracker_alloc<T2>&) throw()
 172     { return true; }
 173
 174   template<class T1, class T2>
 175     bool
 176     operator!=(const tracker_alloc<T1>&, const tracker_alloc<T2>&) throw()
 177     { return false; }
 178
 179   bool
 180   check_construct_destroy(const char* tag, int expected_c, int expected_d);
 181
 182   template<typename Alloc, bool uses_global_new>
 183     bool
 184     check_new(Alloc a = Alloc())
 185     {
 186       bool test __attribute__((unused)) = true;
 187       typename Alloc::pointer p = a.allocate(10);
 188       test &= ( new_called == uses_global_new );
 189       return test;
 190     }
 191
 192   template<typename Alloc, bool uses_global_delete>
 193     bool
 194     check_delete(Alloc a = Alloc())
 195     {
 196       bool test __attribute__((unused)) = true;
 197       typename Alloc::pointer p = a.allocate(10);
 198       a.deallocate(p, 10);
 199       test &= ( delete_called == uses_global_delete );
 200       return test;
 201     }
 202
 203   template<typename Alloc>
 204     bool
 205     check_deallocate_null()
 206     {
 207       // Let's not core here...
 208       Alloc  a;
 209       a.deallocate(NULL, 1);
 210       a.deallocate(NULL, 10);
 211     }
 212
 213   template<typename Alloc>
 214     bool
 215     check_allocate_max_size()
 216     {
 217       Alloc a;
 218       try
 219         {
 220           a.allocate(a.max_size() + 1);
 221         }
 222       catch(std::bad_alloc&)
 223         {
 224           return true;
 225         }
 226       catch(...)
 227         {
 228           throw;
 229         }
 230       throw;
 231     }
 232
 233 }; // namespace __gnu_test
 234
 235 #endif // _GLIBCXX_TESTSUITE_ALLOCATOR_H