diff options
Diffstat (limited to 'generator/parser/rxx_allocator.h')
-rw-r--r-- | generator/parser/rxx_allocator.h | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/generator/parser/rxx_allocator.h b/generator/parser/rxx_allocator.h new file mode 100644 index 0000000..ee6bddb --- /dev/null +++ b/generator/parser/rxx_allocator.h @@ -0,0 +1,115 @@ +/**************************************************************************** +** +** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved. +** Copyright (C) 2002-2005 Roberto Raggi <roberto@kdevelop.org> +** +** This file is part of the Qt Script Generator project on Trolltech Labs. +** +** This file may be used under the terms of the GNU General Public +** License version 2.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of +** this file. Please review the following information to ensure GNU +** General Public Licensing requirements will be met: +** http://www.trolltech.com/products/qt/opensource.html +** +** If you are unsure which license is appropriate for your use, please +** review the following information: +** http://www.trolltech.com/products/qt/licensing.html or contact the +** sales department at sales@trolltech.com. +** +** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE +** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. +** +****************************************************************************/ + + +#ifndef RXX_ALLOCATOR_H +#define RXX_ALLOCATOR_H + +#include <cstddef> +#include <cstdlib> +#include <cstring> +#include <memory> + +template <class _Tp> class rxx_allocator { +public: + typedef _Tp value_type; + typedef _Tp* pointer; + typedef const _Tp* const_pointer; + typedef _Tp& reference; + typedef const _Tp& const_reference; + typedef std::size_t size_type; + typedef std::ptrdiff_t difference_type; + + static const size_type max_block_count = size_type(-1); + static const size_type _S_block_size = 1 << 16; // 64K + + rxx_allocator() { + _M_block_index = max_block_count; + _M_current_index = 0; + _M_storage = 0; + _M_current_block = 0; + } + + ~rxx_allocator() { + for (size_type index = 0; index < _M_block_index + 1; ++index) + delete[] _M_storage[index]; + + ::free(_M_storage); + } + + pointer address(reference __val) { return &__val; } + const_pointer address(const_reference __val) const { return &__val; } + + pointer allocate(size_type __n, const void* = 0) { + const size_type bytes = __n * sizeof(_Tp); + + if (_M_current_block == 0 + || _S_block_size < _M_current_index + bytes) + { + ++_M_block_index; + + _M_storage = reinterpret_cast<char**> + (::realloc(_M_storage, sizeof(char*) * (1 + _M_block_index))); + + _M_current_block = _M_storage[_M_block_index] = reinterpret_cast<char*> + (new char[_S_block_size]); + +#if defined(RXX_ALLOCATOR_INIT_0) // ### make it a policy + ::memset(_M_current_block, 0, _S_block_size); +#endif + _M_current_index = 0; + } + + pointer p = reinterpret_cast<pointer> + (_M_current_block + _M_current_index); + + _M_current_index += bytes; + + return p; + } + + void deallocate(pointer __p, size_type __n) {} + + size_type max_size() const { return size_type(-1) / sizeof(_Tp); } + + void contruct(pointer __p, const_reference __val) { new (__p) _Tp(__val); } + void destruct(pointer __p) { __p->~_Tp(); } + +private: + template <class _Tp1> struct rebind { + typedef rxx_allocator<_Tp1> other; + }; + + template <class _Tp1> rxx_allocator(const rxx_allocator<_Tp1> &__o) {} + +private: + size_type _M_block_index; + size_type _M_current_index; + char *_M_current_block; + char **_M_storage; +}; + +#endif // RXX_ALLOCATOR_H + +// kate: space-indent on; indent-width 2; replace-tabs on; |