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Diffstat (limited to 'gcc-4.4.3/libstdc++-v3/include/ext/debug_allocator.h')
| -rw-r--r-- | gcc-4.4.3/libstdc++-v3/include/ext/debug_allocator.h | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/gcc-4.4.3/libstdc++-v3/include/ext/debug_allocator.h b/gcc-4.4.3/libstdc++-v3/include/ext/debug_allocator.h new file mode 100644 index 000000000..18d80498e --- /dev/null +++ b/gcc-4.4.3/libstdc++-v3/include/ext/debug_allocator.h @@ -0,0 +1,124 @@ +// Allocators -*- C++ -*- + +// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2009 Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library is free +// software; you can redistribute it and/or modify it under the +// terms of the GNU General Public License as published by the +// Free Software Foundation; either version 3, or (at your option) +// any later version. + +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// Under Section 7 of GPL version 3, you are granted additional +// permissions described in the GCC Runtime Library Exception, version +// 3.1, as published by the Free Software Foundation. + +// You should have received a copy of the GNU General Public License and +// a copy of the GCC Runtime Library Exception along with this program; +// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +// <http://www.gnu.org/licenses/>. + +/* + * Copyright (c) 1996-1997 + * Silicon Graphics Computer Systems, Inc. + * + * Permission to use, copy, modify, distribute and sell this software + * and its documentation for any purpose is hereby granted without fee, + * provided that the above copyright notice appear in all copies and + * that both that copyright notice and this permission notice appear + * in supporting documentation. Silicon Graphics makes no + * representations about the suitability of this software for any + * purpose. It is provided "as is" without express or implied warranty. + */ + +/** @file ext/debug_allocator.h + * This file is a GNU extension to the Standard C++ Library. + * You should only include this header if you are using GCC 3 or later. + */ + +#ifndef _DEBUG_ALLOCATOR_H +#define _DEBUG_ALLOCATOR_H 1 + +#include <stdexcept> + +_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) + + using std::size_t; + + /** + * @brief A meta-allocator with debugging bits, as per [20.4]. + * @ingroup allocators + * + * This is precisely the allocator defined in the C++ Standard. + * - all allocation calls operator new + * - all deallocation calls operator delete + */ + template<typename _Alloc> + class debug_allocator + { + public: + typedef typename _Alloc::size_type size_type; + typedef typename _Alloc::difference_type difference_type; + typedef typename _Alloc::pointer pointer; + typedef typename _Alloc::const_pointer const_pointer; + typedef typename _Alloc::reference reference; + typedef typename _Alloc::const_reference const_reference; + typedef typename _Alloc::value_type value_type; + + private: + // _M_extra is the number of objects that correspond to the + // extra space where debug information is stored. + size_type _M_extra; + + _Alloc _M_allocator; + + public: + debug_allocator() + { + const size_t __obj_size = sizeof(value_type); + _M_extra = (sizeof(size_type) + __obj_size - 1) / __obj_size; + } + + pointer + allocate(size_type __n) + { + pointer __res = _M_allocator.allocate(__n + _M_extra); + size_type* __ps = reinterpret_cast<size_type*>(__res); + *__ps = __n; + return __res + _M_extra; + } + + pointer + allocate(size_type __n, const void* __hint) + { + pointer __res = _M_allocator.allocate(__n + _M_extra, __hint); + size_type* __ps = reinterpret_cast<size_type*>(__res); + *__ps = __n; + return __res + _M_extra; + } + + void + deallocate(pointer __p, size_type __n) + { + if (__p) + { + pointer __real_p = __p - _M_extra; + if (*reinterpret_cast<size_type*>(__real_p) != __n) + { + throw std::runtime_error("debug_allocator::deallocate" + " wrong size"); + } + _M_allocator.deallocate(__real_p, __n + _M_extra); + } + else + throw std::runtime_error("debug_allocator::deallocate null pointer"); + } + }; + +_GLIBCXX_END_NAMESPACE + +#endif |