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author | peter <peter@FreeBSD.org> | 2008-06-01 00:03:21 +0000 |
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committer | peter <peter@FreeBSD.org> | 2008-06-01 00:03:21 +0000 |
commit | a2be5f0c15218b0177d73b17d9bcb7589965d685 (patch) | |
tree | c9f0cd9c22378356a1716d32e13e70bc90f98b9c /libstdc++/include/ext/debug_allocator.h | |
parent | 9e0f3cc19c9df1594c9cc36cfd8fddc83c52ad12 (diff) | |
download | FreeBSD-src-a2be5f0c15218b0177d73b17d9bcb7589965d685.zip FreeBSD-src-a2be5f0c15218b0177d73b17d9bcb7589965d685.tar.gz |
Reorganize the gcc vendor import work area. This flattens out a bunch
of unnecessary path components that are relics of cvs2svn.
(These are directory moves)
Diffstat (limited to 'libstdc++/include/ext/debug_allocator.h')
-rw-r--r-- | libstdc++/include/ext/debug_allocator.h | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/libstdc++/include/ext/debug_allocator.h b/libstdc++/include/ext/debug_allocator.h new file mode 100644 index 0000000..43a9a87 --- /dev/null +++ b/libstdc++/include/ext/debug_allocator.h @@ -0,0 +1,128 @@ +// Allocators -*- C++ -*- + +// Copyright (C) 2001, 2002, 2003, 2004, 2005 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 2, 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. + +// You should have received a copy of the GNU General Public License along +// with this library; see the file COPYING. If not, write to the Free +// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, +// USA. + +// As a special exception, you may use this file as part of a free software +// library without restriction. Specifically, if other files instantiate +// templates or use macros or inline functions from this file, or you compile +// this file and link it with other files to produce an executable, this +// file does not by itself cause the resulting executable to be covered by +// the GNU General Public License. This exception does not however +// invalidate any other reasons why the executable file might be covered by +// the GNU General Public License. + +/* + * 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]. + * + * 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 |