forked from KolibriOS/kolibrios
451 lines
15 KiB
C++
451 lines
15 KiB
C++
// Debugging support implementation -*- C++ -*-
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// Copyright (C) 2003-2013 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 3, 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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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file debug/functions.h
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* This file is a GNU debug extension to the Standard C++ Library.
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*/
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#ifndef _GLIBCXX_DEBUG_FUNCTIONS_H
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#define _GLIBCXX_DEBUG_FUNCTIONS_H 1
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#include <bits/c++config.h>
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#include <bits/stl_iterator_base_types.h> // for iterator_traits, categories and
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// _Iter_base
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#include <bits/cpp_type_traits.h> // for __is_integer
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#include <debug/formatter.h>
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namespace __gnu_debug
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{
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template<typename _Iterator, typename _Sequence>
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class _Safe_iterator;
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// An arbitrary iterator pointer is not singular.
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inline bool
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__check_singular_aux(const void*) { return false; }
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// We may have an iterator that derives from _Safe_iterator_base but isn't
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// a _Safe_iterator.
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template<typename _Iterator>
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inline bool
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__check_singular(_Iterator& __x)
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{ return __check_singular_aux(&__x); }
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/** Non-NULL pointers are nonsingular. */
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template<typename _Tp>
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inline bool
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__check_singular(const _Tp* __ptr)
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{ return __ptr == 0; }
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/** Safe iterators know if they are singular. */
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template<typename _Iterator, typename _Sequence>
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inline bool
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__check_singular(const _Safe_iterator<_Iterator, _Sequence>& __x)
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{ return __x._M_singular(); }
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/** Assume that some arbitrary iterator is dereferenceable, because we
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can't prove that it isn't. */
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template<typename _Iterator>
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inline bool
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__check_dereferenceable(_Iterator&)
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{ return true; }
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/** Non-NULL pointers are dereferenceable. */
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template<typename _Tp>
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inline bool
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__check_dereferenceable(const _Tp* __ptr)
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{ return __ptr; }
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/** Safe iterators know if they are singular. */
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template<typename _Iterator, typename _Sequence>
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inline bool
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__check_dereferenceable(const _Safe_iterator<_Iterator, _Sequence>& __x)
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{ return __x._M_dereferenceable(); }
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/** If the distance between two random access iterators is
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* nonnegative, assume the range is valid.
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*/
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template<typename _RandomAccessIterator>
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inline bool
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__valid_range_aux2(const _RandomAccessIterator& __first,
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const _RandomAccessIterator& __last,
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std::random_access_iterator_tag)
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{ return __last - __first >= 0; }
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/** Can't test for a valid range with input iterators, because
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* iteration may be destructive. So we just assume that the range
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* is valid.
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*/
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template<typename _InputIterator>
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inline bool
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__valid_range_aux2(const _InputIterator&, const _InputIterator&,
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std::input_iterator_tag)
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{ return true; }
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/** We say that integral types for a valid range, and defer to other
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* routines to realize what to do with integral types instead of
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* iterators.
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*/
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template<typename _Integral>
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inline bool
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__valid_range_aux(const _Integral&, const _Integral&, std::__true_type)
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{ return true; }
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/** We have iterators, so figure out what kind of iterators that are
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* to see if we can check the range ahead of time.
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*/
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template<typename _InputIterator>
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inline bool
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__valid_range_aux(const _InputIterator& __first,
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const _InputIterator& __last, std::__false_type)
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{ return __valid_range_aux2(__first, __last,
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std::__iterator_category(__first)); }
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/** Don't know what these iterators are, or if they are even
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* iterators (we may get an integral type for InputIterator), so
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* see if they are integral and pass them on to the next phase
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* otherwise.
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*/
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template<typename _InputIterator>
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inline bool
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__valid_range(const _InputIterator& __first, const _InputIterator& __last)
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{
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typedef typename std::__is_integer<_InputIterator>::__type _Integral;
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return __valid_range_aux(__first, __last, _Integral());
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}
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/** Safe iterators know how to check if they form a valid range. */
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template<typename _Iterator, typename _Sequence>
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inline bool
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__valid_range(const _Safe_iterator<_Iterator, _Sequence>& __first,
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const _Safe_iterator<_Iterator, _Sequence>& __last)
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{ return __first._M_valid_range(__last); }
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/** Safe local iterators know how to check if they form a valid range. */
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template<typename _Iterator, typename _Sequence>
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inline bool
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__valid_range(const _Safe_local_iterator<_Iterator, _Sequence>& __first,
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const _Safe_local_iterator<_Iterator, _Sequence>& __last)
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{ return __first._M_valid_range(__last); }
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/* Checks that [first, last) is a valid range, and then returns
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* __first. This routine is useful when we can't use a separate
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* assertion statement because, e.g., we are in a constructor.
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*/
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template<typename _InputIterator>
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inline _InputIterator
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__check_valid_range(const _InputIterator& __first,
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const _InputIterator& __last
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__attribute__((__unused__)))
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{
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__glibcxx_check_valid_range(__first, __last);
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return __first;
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}
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/** Checks that __s is non-NULL or __n == 0, and then returns __s. */
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template<typename _CharT, typename _Integer>
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inline const _CharT*
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__check_string(const _CharT* __s,
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const _Integer& __n __attribute__((__unused__)))
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{
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#ifdef _GLIBCXX_DEBUG_PEDANTIC
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__glibcxx_assert(__s != 0 || __n == 0);
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#endif
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return __s;
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}
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/** Checks that __s is non-NULL and then returns __s. */
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template<typename _CharT>
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inline const _CharT*
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__check_string(const _CharT* __s)
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{
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#ifdef _GLIBCXX_DEBUG_PEDANTIC
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__glibcxx_assert(__s != 0);
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#endif
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return __s;
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}
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// Can't check if an input iterator sequence is sorted, because we
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// can't step through the sequence.
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template<typename _InputIterator>
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inline bool
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__check_sorted_aux(const _InputIterator&, const _InputIterator&,
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std::input_iterator_tag)
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{ return true; }
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// Can verify if a forward iterator sequence is in fact sorted using
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// std::__is_sorted
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template<typename _ForwardIterator>
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inline bool
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__check_sorted_aux(_ForwardIterator __first, _ForwardIterator __last,
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std::forward_iterator_tag)
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{
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if (__first == __last)
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return true;
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_ForwardIterator __next = __first;
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for (++__next; __next != __last; __first = __next, ++__next)
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if (*__next < *__first)
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return false;
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return true;
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}
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// For performance reason, as the iterator range has been validated, check on
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// random access safe iterators is done using the base iterator.
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template<typename _Iterator, typename _Sequence>
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inline bool
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__check_sorted_aux(const _Safe_iterator<_Iterator, _Sequence>& __first,
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const _Safe_iterator<_Iterator, _Sequence>& __last,
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std::random_access_iterator_tag __tag)
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{ return __check_sorted_aux(__first.base(), __last.base(), __tag); }
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// Can't check if an input iterator sequence is sorted, because we can't step
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// through the sequence.
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template<typename _InputIterator, typename _Predicate>
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inline bool
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__check_sorted_aux(const _InputIterator&, const _InputIterator&,
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_Predicate, std::input_iterator_tag)
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{ return true; }
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// Can verify if a forward iterator sequence is in fact sorted using
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// std::__is_sorted
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template<typename _ForwardIterator, typename _Predicate>
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inline bool
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__check_sorted_aux(_ForwardIterator __first, _ForwardIterator __last,
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_Predicate __pred, std::forward_iterator_tag)
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{
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if (__first == __last)
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return true;
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_ForwardIterator __next = __first;
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for (++__next; __next != __last; __first = __next, ++__next)
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if (__pred(*__next, *__first))
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return false;
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return true;
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}
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// For performance reason, as the iterator range has been validated, check on
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// random access safe iterators is done using the base iterator.
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template<typename _Iterator, typename _Sequence,
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typename _Predicate>
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inline bool
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__check_sorted_aux(const _Safe_iterator<_Iterator, _Sequence>& __first,
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const _Safe_iterator<_Iterator, _Sequence>& __last,
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_Predicate __pred,
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std::random_access_iterator_tag __tag)
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{ return __check_sorted_aux(__first.base(), __last.base(), __pred, __tag); }
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// Determine if a sequence is sorted.
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template<typename _InputIterator>
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inline bool
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__check_sorted(const _InputIterator& __first, const _InputIterator& __last)
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{
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// Verify that the < operator for elements in the sequence is a
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// StrictWeakOrdering by checking that it is irreflexive.
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__glibcxx_assert(__first == __last || !(*__first < *__first));
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return __check_sorted_aux(__first, __last,
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std::__iterator_category(__first));
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}
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template<typename _InputIterator, typename _Predicate>
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inline bool
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__check_sorted(const _InputIterator& __first, const _InputIterator& __last,
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_Predicate __pred)
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{
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// Verify that the predicate is StrictWeakOrdering by checking that it
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// is irreflexive.
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__glibcxx_assert(__first == __last || !__pred(*__first, *__first));
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return __check_sorted_aux(__first, __last, __pred,
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std::__iterator_category(__first));
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}
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template<typename _InputIterator>
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inline bool
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__check_sorted_set_aux(const _InputIterator& __first,
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const _InputIterator& __last,
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std::__true_type)
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{ return __check_sorted(__first, __last); }
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template<typename _InputIterator>
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inline bool
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__check_sorted_set_aux(const _InputIterator&,
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const _InputIterator&,
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std::__false_type)
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{ return true; }
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template<typename _InputIterator, typename _Predicate>
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inline bool
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__check_sorted_set_aux(const _InputIterator& __first,
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const _InputIterator& __last,
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_Predicate __pred, std::__true_type)
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{ return __check_sorted(__first, __last, __pred); }
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template<typename _InputIterator, typename _Predicate>
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inline bool
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__check_sorted_set_aux(const _InputIterator&,
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const _InputIterator&, _Predicate,
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std::__false_type)
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{ return true; }
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// ... special variant used in std::merge, std::includes, std::set_*.
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template<typename _InputIterator1, typename _InputIterator2>
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inline bool
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__check_sorted_set(const _InputIterator1& __first,
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const _InputIterator1& __last,
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const _InputIterator2&)
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{
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typedef typename std::iterator_traits<_InputIterator1>::value_type
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_ValueType1;
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typedef typename std::iterator_traits<_InputIterator2>::value_type
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_ValueType2;
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typedef typename std::__are_same<_ValueType1, _ValueType2>::__type
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_SameType;
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return __check_sorted_set_aux(__first, __last, _SameType());
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}
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template<typename _InputIterator1, typename _InputIterator2,
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typename _Predicate>
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inline bool
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__check_sorted_set(const _InputIterator1& __first,
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const _InputIterator1& __last,
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const _InputIterator2&, _Predicate __pred)
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{
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typedef typename std::iterator_traits<_InputIterator1>::value_type
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_ValueType1;
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typedef typename std::iterator_traits<_InputIterator2>::value_type
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_ValueType2;
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typedef typename std::__are_same<_ValueType1, _ValueType2>::__type
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_SameType;
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return __check_sorted_set_aux(__first, __last, __pred, _SameType());
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}
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 270. Binary search requirements overly strict
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// Determine if a sequence is partitioned w.r.t. this element.
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template<typename _ForwardIterator, typename _Tp>
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inline bool
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__check_partitioned_lower(_ForwardIterator __first,
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_ForwardIterator __last, const _Tp& __value)
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{
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while (__first != __last && *__first < __value)
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++__first;
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if (__first != __last)
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{
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++__first;
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while (__first != __last && !(*__first < __value))
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++__first;
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}
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return __first == __last;
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}
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template<typename _ForwardIterator, typename _Tp>
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inline bool
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__check_partitioned_upper(_ForwardIterator __first,
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_ForwardIterator __last, const _Tp& __value)
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{
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while (__first != __last && !(__value < *__first))
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++__first;
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if (__first != __last)
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{
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++__first;
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while (__first != __last && __value < *__first)
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++__first;
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}
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return __first == __last;
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}
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// Determine if a sequence is partitioned w.r.t. this element.
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template<typename _ForwardIterator, typename _Tp, typename _Pred>
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inline bool
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__check_partitioned_lower(_ForwardIterator __first,
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_ForwardIterator __last, const _Tp& __value,
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_Pred __pred)
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{
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while (__first != __last && bool(__pred(*__first, __value)))
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++__first;
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if (__first != __last)
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{
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++__first;
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while (__first != __last && !bool(__pred(*__first, __value)))
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++__first;
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}
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return __first == __last;
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}
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template<typename _ForwardIterator, typename _Tp, typename _Pred>
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inline bool
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__check_partitioned_upper(_ForwardIterator __first,
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_ForwardIterator __last, const _Tp& __value,
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_Pred __pred)
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{
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while (__first != __last && !bool(__pred(__value, *__first)))
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++__first;
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if (__first != __last)
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{
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++__first;
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while (__first != __last && bool(__pred(__value, *__first)))
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++__first;
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}
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return __first == __last;
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}
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// Helper struct to detect random access safe iterators.
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template<typename _Iterator>
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struct __is_safe_random_iterator
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{
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enum { __value = 0 };
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typedef std::__false_type __type;
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};
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template<typename _Iterator, typename _Sequence>
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struct __is_safe_random_iterator<_Safe_iterator<_Iterator, _Sequence> >
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: std::__are_same<std::random_access_iterator_tag,
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typename std::iterator_traits<_Iterator>::
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iterator_category>
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{ };
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template<typename _Iterator>
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struct _Siter_base
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: std::_Iter_base<_Iterator, __is_safe_random_iterator<_Iterator>::__value>
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{ };
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/** Helper function to extract base iterator of random access safe iterator
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in order to reduce performance impact of debug mode. Limited to random
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access iterator because it is the only category for which it is possible
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to check for correct iterators order in the __valid_range function
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thanks to the < operator.
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*/
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template<typename _Iterator>
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inline typename _Siter_base<_Iterator>::iterator_type
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__base(_Iterator __it)
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{ return _Siter_base<_Iterator>::_S_base(__it); }
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} // namespace __gnu_debug
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#endif
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