140 lines
4.7 KiB
C
140 lines
4.7 KiB
C
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// Allocators -*- C++ -*-
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// Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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/*
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* Copyright (c) 1996-1997
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*/
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/** @file ext/debug_allocator.h
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* This file is a GNU extension to the Standard C++ Library.
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* You should only include this header if you are using GCC 3 or later.
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*/
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#ifndef _DEBUG_ALLOCATOR_H
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#define _DEBUG_ALLOCATOR_H 1
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#include <bits/allocator_traits.h>
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namespace __gnu_cxx
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{
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/**
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* @if maint
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* An adaptor for an underlying allocator (_Alloc) to check the size
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* arguments for debugging.
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*
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* "There is some evidence that this can confuse Purify." - SGI comment
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*
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* This adaptor is "SGI" style. The _Alloc parameter must also be "SGI".
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* @endif
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* (See @link Allocators allocators info @endlink for more.)
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*/
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template<typename _Alloc>
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class __debug_alloc
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{
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private:
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// Size of space used to store size. Note that this must be
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// large enough to preserve alignment.
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enum {_S_extra = 8};
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public:
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static void*
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allocate(size_t __n)
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{
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char* __result = (char*)_Alloc::allocate(__n + (int) _S_extra);
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*(size_t*)__result = __n;
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return __result + (int) _S_extra;
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}
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static void
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deallocate(void* __p, size_t __n)
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{
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char* __real_p = (char*)__p - (int) _S_extra;
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if (*(size_t*)__real_p != __n)
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abort();
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_Alloc::deallocate(__real_p, __n + (int) _S_extra);
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}
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};
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//@{
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/** Comparison operators for all of the predifined SGI-style allocators.
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* This ensures that __allocator<malloc_alloc> (for example) will work
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* correctly. As required, all allocators compare equal.
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*/
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template<typename _Alloc>
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inline bool
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operator==(const __debug_alloc<_Alloc>&, const __debug_alloc<_Alloc>&)
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{ return true; }
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template<typename _Alloc>
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inline bool
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operator!=(const __debug_alloc<_Alloc>&, const __debug_alloc<_Alloc>&)
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{ return false; }
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//@}
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} // namespace __gnu_cxx
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namespace std
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{
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//@{
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/// Versions for the predefined "SGI" style allocators.
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template<typename _Tp, typename _Alloc>
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struct _Alloc_traits<_Tp, __gnu_cxx::__debug_alloc<_Alloc> >
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{
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static const bool _S_instanceless = true;
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typedef __gnu_cxx::__debug_alloc<_Alloc> base_alloc_type;
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typedef __simple_alloc<_Tp, base_alloc_type> _Alloc_type;
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typedef __allocator<_Tp, base_alloc_type> allocator_type;
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};
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//@}
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//@{
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/// Versions for the __allocator adaptor used with the predefined
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/// "SGI" style allocators.
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template<typename _Tp, typename _Tp1, typename _Alloc>
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struct _Alloc_traits<_Tp, __allocator<_Tp1,
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__gnu_cxx::__debug_alloc<_Alloc> > >
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{
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static const bool _S_instanceless = true;
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typedef __gnu_cxx::__debug_alloc<_Alloc> base_alloc_type;
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typedef __simple_alloc<_Tp, base_alloc_type> _Alloc_type;
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typedef __allocator<_Tp, base_alloc_type> allocator_type;
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};
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//@}
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} // namespace std
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#endif
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