// Debugging iterator implementation (out of line) -*- C++ -*- // Copyright (C) 2003-2020 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/>. /** @file debug/safe_iterator.tcc * This file is a GNU debug extension to the Standard C++ Library. */ #ifndef _GLIBCXX_DEBUG_SAFE_ITERATOR_TCC #define _GLIBCXX_DEBUG_SAFE_ITERATOR_TCC 1 #include <bits/stl_algobase.h> namespace __gnu_debug { template<typename _Iterator, typename _Sequence, typename _Category> typename _Distance_traits<_Iterator>::__type _Safe_iterator<_Iterator, _Sequence, _Category>:: _M_get_distance_from_begin() const { typedef _Sequence_traits<_Sequence> _SeqTraits; // No need to consider before_begin as this function is only used in // _M_can_advance which won't be used for forward_list iterators. if (_M_is_begin()) return std::make_pair(0, __dp_exact); if (_M_is_end()) return _SeqTraits::_S_size(*_M_get_sequence()); typename _Distance_traits<_Iterator>::__type __res = __get_distance(_M_get_sequence()->_M_base().begin(), base()); if (__res.second == __dp_equality) return std::make_pair(1, __dp_sign); return __res; } template<typename _Iterator, typename _Sequence, typename _Category> typename _Distance_traits<_Iterator>::__type _Safe_iterator<_Iterator, _Sequence, _Category>:: _M_get_distance_to_end() const { typedef _Sequence_traits<_Sequence> _SeqTraits; // No need to consider before_begin as this function is only used in // _M_can_advance which won't be used for forward_list iterators. if (_M_is_begin()) return _SeqTraits::_S_size(*_M_get_sequence()); if (_M_is_end()) return std::make_pair(0, __dp_exact); typename _Distance_traits<_Iterator>::__type __res = __get_distance(base(), _M_get_sequence()->_M_base().end()); if (__res.second == __dp_equality) return std::make_pair(1, __dp_sign); return __res; } template<typename _Iterator, typename _Sequence, typename _Category> bool _Safe_iterator<_Iterator, _Sequence, _Category>:: _M_can_advance(difference_type __n, bool __strict) const { if (this->_M_singular()) return false; if (__n == 0) return true; if (__n < 0) { std::pair<difference_type, _Distance_precision> __dist = _M_get_distance_from_begin(); return __dist.second == __dp_exact ? __dist.first >= -__n : !__strict && __dist.first > 0; } else { std::pair<difference_type, _Distance_precision> __dist = _M_get_distance_to_end(); return __dist.second == __dp_exact ? __dist.first >= __n : !__strict && __dist.first > 0; } } template<typename _Iterator, typename _Sequence, typename _Category> typename _Distance_traits<_Iterator>::__type _Safe_iterator<_Iterator, _Sequence, _Category>:: _M_get_distance_to(const _Safe_iterator& __rhs) const { typedef typename _Distance_traits<_Iterator>::__type _Dist; typedef _Sequence_traits<_Sequence> _SeqTraits; _Dist __base_dist = __get_distance(this->base(), __rhs.base()); if (__base_dist.second == __dp_exact) return __base_dist; _Dist __seq_dist = _SeqTraits::_S_size(*this->_M_get_sequence()); if (this->_M_is_before_begin()) { if (__rhs._M_is_begin()) return std::make_pair(1, __dp_exact); return __seq_dist.second == __dp_exact ? std::make_pair(__seq_dist.first + 1, __dp_exact) : __seq_dist; } if (this->_M_is_begin()) { if (__rhs._M_is_before_begin()) return std::make_pair(-1, __dp_exact); if (__rhs._M_is_end()) return __seq_dist; return std::make_pair(__seq_dist.first, __seq_dist.second == __dp_exact ? __dp_sign_max_size : __seq_dist.second); } if (this->_M_is_end()) { if (__rhs._M_is_before_begin()) return __seq_dist.second == __dp_exact ? std::make_pair(-__seq_dist.first - 1, __dp_exact) : std::make_pair(-__seq_dist.first, __dp_sign); if (__rhs._M_is_begin()) return std::make_pair(-__seq_dist.first, __seq_dist.second); return std::make_pair(-__seq_dist.first, __seq_dist.second == __dp_exact ? __dp_sign_max_size : __seq_dist.second); } if (__rhs._M_is_before_begin()) return __seq_dist.second == __dp_exact ? std::make_pair(__seq_dist.first - 1, __dp_exact) : std::make_pair(-__seq_dist.first, __dp_sign); if (__rhs._M_is_begin()) return std::make_pair(-__seq_dist.first, __seq_dist.second == __dp_exact ? __dp_sign_max_size : __seq_dist.second); if (__rhs._M_is_end()) return std::make_pair(__seq_dist.first, __seq_dist.second == __dp_exact ? __dp_sign_max_size : __seq_dist.second); return std::make_pair(1, __dp_equality); } template<typename _Iterator, typename _Sequence, typename _Category> bool _Safe_iterator<_Iterator, _Sequence, _Category>:: _M_valid_range(const _Safe_iterator& __rhs, std::pair<difference_type, _Distance_precision>& __dist, bool __check_dereferenceable) const { if (!_M_can_compare(__rhs)) return false; /* Determine iterators order */ __dist = _M_get_distance_to(__rhs); switch (__dist.second) { case __dp_equality: if (__dist.first == 0) return true; break; case __dp_sign: case __dp_exact: // If range is not empty first iterator must be dereferenceable. if (__dist.first > 0) return !__check_dereferenceable || _M_dereferenceable(); return __dist.first == 0; } // Assume that this is a valid range; we can't check anything else. return true; } template<typename _Iterator, typename _Sequence> bool _Safe_iterator<_Iterator, _Sequence, std::random_access_iterator_tag>:: _M_valid_range(const _Safe_iterator& __rhs, std::pair<difference_type, _Distance_precision>& __dist) const { if (!this->_M_can_compare(__rhs)) return false; /* Determine iterators order */ __dist = std::make_pair(__rhs.base() - this->base(), __dp_exact); // If range is not empty first iterator must be dereferenceable. if (__dist.first > 0) return this->_M_dereferenceable(); return __dist.first == 0; } } // namespace __gnu_debug namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION template<bool _IsMove, typename _Ite, typename _Seq, typename _Cat, typename _OI> _OI __copy_move_a( const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __first, const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __last, _OI __result) { typename ::__gnu_debug::_Distance_traits<_Ite>::__type __dist; __glibcxx_check_valid_range2(__first, __last, __dist); __glibcxx_check_can_increment(__result, __dist.first); if (__dist.second > ::__gnu_debug::__dp_equality) return std::__copy_move_a<_IsMove>(__first.base(), __last.base(), __result); return std::__copy_move_a1<_IsMove>(__first, __last, __result); } template<bool _IsMove, typename _II, typename _Ite, typename _Seq, typename _Cat> __gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat> __copy_move_a(_II __first, _II __last, const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __result) { typename ::__gnu_debug::_Distance_traits<_II>::__type __dist; __glibcxx_check_valid_range2(__first, __last, __dist); __glibcxx_check_can_increment(__result, __dist.first); if (__dist.second > ::__gnu_debug::__dp_sign && __result._M_can_advance(__dist.first, true)) return ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>( std::__copy_move_a<_IsMove>(__first, __last, __result.base()), __result._M_sequence); return std::__copy_move_a1<_IsMove>(__first, __last, __result); } template<bool _IsMove, typename _IIte, typename _ISeq, typename _ICat, typename _OIte, typename _OSeq, typename _OCat> ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat> __copy_move_a( const ::__gnu_debug::_Safe_iterator<_IIte, _ISeq, _ICat>& __first, const ::__gnu_debug::_Safe_iterator<_IIte, _ISeq, _ICat>& __last, const ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>& __result) { typename ::__gnu_debug::_Distance_traits<_IIte>::__type __dist; __glibcxx_check_valid_range2(__first, __last, __dist); __glibcxx_check_can_increment(__result, __dist.first); if (__dist.second > ::__gnu_debug::__dp_equality) { if (__dist.second > ::__gnu_debug::__dp_sign && __result._M_can_advance(__dist.first, true)) return ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>( std::__copy_move_a<_IsMove>(__first.base(), __last.base(), __result.base()), __result._M_sequence); return std::__copy_move_a<_IsMove>(__first.base(), __last.base(), __result); } return std::__copy_move_a1<_IsMove>(__first, __last, __result); } template<bool _IsMove, typename _Ite, typename _Seq, typename _Cat, typename _OI> _OI __copy_move_backward_a( const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __first, const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __last, _OI __result) { typename ::__gnu_debug::_Distance_traits<_Ite>::__type __dist; __glibcxx_check_valid_range2(__first, __last, __dist); __glibcxx_check_can_increment(__result, -__dist.first); if (__dist.second > ::__gnu_debug::__dp_equality) return std::__copy_move_backward_a<_IsMove>( __first.base(), __last.base(), __result); return std::__copy_move_backward_a1<_IsMove>(__first, __last, __result); } template<bool _IsMove, typename _II, typename _Ite, typename _Seq, typename _Cat> __gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat> __copy_move_backward_a(_II __first, _II __last, const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __result) { typename ::__gnu_debug::_Distance_traits<_II>::__type __dist; __glibcxx_check_valid_range2(__first, __last, __dist); __glibcxx_check_can_increment(__result, -__dist.first); if (__dist.second > ::__gnu_debug::__dp_sign && __result._M_can_advance(-__dist.first, true)) return ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>( std::__copy_move_backward_a<_IsMove>(__first, __last, __result.base()), __result._M_sequence); return std::__copy_move_backward_a1<_IsMove>(__first, __last, __result); } template<bool _IsMove, typename _IIte, typename _ISeq, typename _ICat, typename _OIte, typename _OSeq, typename _OCat> ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat> __copy_move_backward_a( const ::__gnu_debug::_Safe_iterator<_IIte, _ISeq, _ICat>& __first, const ::__gnu_debug::_Safe_iterator<_IIte, _ISeq, _ICat>& __last, const ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>& __result) { typename ::__gnu_debug::_Distance_traits<_IIte>::__type __dist; __glibcxx_check_valid_range2(__first, __last, __dist); __glibcxx_check_can_increment(__result, -__dist.first); if (__dist.second > ::__gnu_debug::__dp_equality) { if (__dist.second > ::__gnu_debug::__dp_sign && __result._M_can_advance(-__dist.first, true)) return ::__gnu_debug::_Safe_iterator<_OIte, _OSeq, _OCat>( std::__copy_move_backward_a<_IsMove>(__first.base(), __last.base(), __result.base()), __result._M_sequence); return std::__copy_move_backward_a<_IsMove>( __first.base(), __last.base(), __result); } return std::__copy_move_backward_a1<_IsMove>(__first, __last, __result); } template<typename _Ite, typename _Seq, typename _Cat, typename _Tp> void __fill_a(const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __first, const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __last, const _Tp& __value) { typename ::__gnu_debug::_Distance_traits<_Ite>::__type __dist; __glibcxx_check_valid_range2(__first, __last, __dist); if (__dist.second > ::__gnu_debug::__dp_equality) std::__fill_a(__first.base(), __last.base(), __value); std::__fill_a1(__first, __last, __value); } template<typename _Ite, typename _Seq, typename _Cat, typename _Size, typename _Tp> ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat> __fill_n_a(const ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>& __first, _Size __n, const _Tp& __value, std::input_iterator_tag) { #if __cplusplus >= 201103L static_assert(is_integral<_Size>{}, "fill_n must pass integral size"); #endif if (__n <= 0) return __first; __glibcxx_check_can_increment(__first, __n); if (__first._M_can_advance(__n, true)) return ::__gnu_debug::_Safe_iterator<_Ite, _Seq, _Cat>( std::__fill_n_a(__first.base(), __n, __value, _Cat()), __first._M_sequence); return std::__fill_n_a1(__first, __n, __value); } template<typename _II1, typename _Seq1, typename _Cat1, typename _II2> bool __equal_aux( const ::__gnu_debug::_Safe_iterator<_II1, _Seq1, _Cat1>& __first1, const ::__gnu_debug::_Safe_iterator<_II1, _Seq1, _Cat1>& __last1, _II2 __first2) { typename ::__gnu_debug::_Distance_traits<_II1>::__type __dist; __glibcxx_check_valid_range2(__first1, __last1, __dist); __glibcxx_check_can_increment(__first2, __dist.first); if (__dist.second > ::__gnu_debug::__dp_equality) return std::__equal_aux(__first1.base(), __last1.base(), __first2); return std::__equal_aux1(__first1, __last1, __first2); } template<typename _II1, typename _II2, typename _Seq2, typename _Cat2> bool __equal_aux(_II1 __first1, _II1 __last1, const ::__gnu_debug::_Safe_iterator<_II2, _Seq2, _Cat2>& __first2) { typename ::__gnu_debug::_Distance_traits<_II1>::__type __dist; __glibcxx_check_valid_range2(__first1, __last1, __dist); __glibcxx_check_can_increment(__first2, __dist.first); if (__dist.second > ::__gnu_debug::__dp_sign && __first2._M_can_advance(__dist.first, true)) return std::__equal_aux(__first1, __last1, __first2.base()); return std::__equal_aux1(__first1, __last1, __first2); } template<typename _II1, typename _Seq1, typename _Cat1, typename _II2, typename _Seq2, typename _Cat2> bool __equal_aux( const ::__gnu_debug::_Safe_iterator<_II1, _Seq1, _Cat1>& __first1, const ::__gnu_debug::_Safe_iterator<_II1, _Seq1, _Cat1>& __last1, const ::__gnu_debug::_Safe_iterator<_II2, _Seq2, _Cat2>& __first2) { typename ::__gnu_debug::_Distance_traits<_II1>::__type __dist; __glibcxx_check_valid_range2(__first1, __last1, __dist); __glibcxx_check_can_increment(__first2, __dist.first); if (__dist.second > ::__gnu_debug::__dp_equality) { if (__dist.second > ::__gnu_debug::__dp_sign && __first2._M_can_advance(__dist.first, true)) return std::__equal_aux(__first1.base(), __last1.base(), __first2.base()); return std::__equal_aux(__first1.base(), __last1.base(), __first2); } return __equal_aux1(__first1, __last1, __first2); } _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif