// Debugging support implementation -*- C++ -*-
// Copyright (C) 2003-2017 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/functions.h
* This file is a GNU debug extension to the Standard C++ Library.
*/
#ifndef _GLIBCXX_DEBUG_FUNCTIONS_H
#define _GLIBCXX_DEBUG_FUNCTIONS_H 1
#include <bits/move.h> // for __addressof
#include <bits/stl_function.h> // for less
#if __cplusplus >= 201103L
# include <type_traits> // for is_lvalue_reference and conditional.
#endif
#include <debug/helper_functions.h>
#include <debug/formatter.h>
namespace __gnu_debug
{
template<typename _Iterator, typename _Sequence>
class _Safe_iterator;
template<typename _Sequence>
struct _Insert_range_from_self_is_safe
{ enum { __value = 0 }; };
template<typename _Sequence>
struct _Is_contiguous_sequence : std::__false_type { };
// An arbitrary iterator pointer is not singular.
inline bool
__check_singular_aux(const void*) { return false; }
// We may have an iterator that derives from _Safe_iterator_base but isn't
// a _Safe_iterator.
template<typename _Iterator>
inline bool
__check_singular(const _Iterator& __x)
{ return __check_singular_aux(std::__addressof(__x)); }
/** Non-NULL pointers are nonsingular. */
template<typename _Tp>
inline bool
__check_singular(const _Tp* __ptr)
{ return __ptr == 0; }
/** Assume that some arbitrary iterator is dereferenceable, because we
can't prove that it isn't. */
template<typename _Iterator>
inline bool
__check_dereferenceable(const _Iterator&)
{ return true; }
/** Non-NULL pointers are dereferenceable. */
template<typename _Tp>
inline bool
__check_dereferenceable(const _Tp* __ptr)
{ return __ptr; }
/* Checks that [first, last) is a valid range, and then returns
* __first. This routine is useful when we can't use a separate
* assertion statement because, e.g., we are in a constructor.
*/
template<typename _InputIterator>
inline _InputIterator
__check_valid_range(const _InputIterator& __first,
const _InputIterator& __last
__attribute__((__unused__)))
{
__glibcxx_check_valid_range(__first, __last);
return __first;
}
/* Handle the case where __other is a pointer to _Sequence::value_type. */
template<typename _Iterator, typename _Sequence>
inline bool
__foreign_iterator_aux4(const _Safe_iterator<_Iterator, _Sequence>& __it,
const typename _Sequence::value_type* __other)
{
typedef const typename _Sequence::value_type* _PointerType;
typedef std::less<_PointerType> _Less;
#if __cplusplus >= 201103L
constexpr _Less __l{};
#else
const _Less __l = _Less();
#endif
const _Sequence* __seq = __it._M_get_sequence();
const _PointerType __begin = std::__addressof(*__seq->_M_base().begin());
const _PointerType __end = std::__addressof(*(__seq->_M_base().end()-1));
// Check whether __other points within the contiguous storage.
return __l(__other, __begin) || __l(__end, __other);
}
/* Fallback overload for when we can't tell, assume it is valid. */
template<typename _Iterator, typename _Sequence>
inline bool
__foreign_iterator_aux4(const _Safe_iterator<_Iterator, _Sequence>&, ...)
{ return true; }
/* Handle sequences with contiguous storage */
template<typename _Iterator, typename _Sequence, typename _InputIterator>
inline bool
__foreign_iterator_aux3(const _Safe_iterator<_Iterator, _Sequence>& __it,
const _InputIterator& __other,
const _InputIterator& __other_end,
std::__true_type)
{
if (__other == __other_end)
return true; // inserting nothing is safe even if not foreign iters
if (__it._M_get_sequence()->begin() == __it._M_get_sequence()->end())
return true; // can't be self-inserting if self is empty
return __foreign_iterator_aux4(__it, std::__addressof(*__other));
}
/* Handle non-contiguous containers, assume it is valid. */
template<typename _Iterator, typename _Sequence, typename _InputIterator>
inline bool
__foreign_iterator_aux3(const _Safe_iterator<_Iterator, _Sequence>&,
const _InputIterator&, const _InputIterator&,
std::__false_type)
{ return true; }
/** Handle debug iterators from the same type of container. */
template<typename _Iterator, typename _Sequence, typename _OtherIterator>
inline bool
__foreign_iterator_aux2(const _Safe_iterator<_Iterator, _Sequence>& __it,
const _Safe_iterator<_OtherIterator, _Sequence>& __other,
const _Safe_iterator<_OtherIterator, _Sequence>&)
{ return __it._M_get_sequence() != __other._M_get_sequence(); }
/** Handle debug iterators from different types of container. */
template<typename _Iterator, typename _Sequence, typename _OtherIterator,
typename _OtherSequence>
inline bool
__foreign_iterator_aux2(const _Safe_iterator<_Iterator, _Sequence>& __it,
const _Safe_iterator<_OtherIterator, _OtherSequence>&,
const _Safe_iterator<_OtherIterator, _OtherSequence>&)
{ return true; }
/* Handle non-debug iterators. */
template<typename _Iterator, typename _Sequence, typename _InputIterator>
inline bool
__foreign_iterator_aux2(const _Safe_iterator<_Iterator, _Sequence>& __it,
const _InputIterator& __other,
const _InputIterator& __other_end)
{
#if __cplusplus < 201103L
typedef _Is_contiguous_sequence<_Sequence> __tag;
#else
using __lvalref = std::is_lvalue_reference<
typename std::iterator_traits<_InputIterator>::reference>;
using __contiguous = _Is_contiguous_sequence<_Sequence>;
using __tag = typename std::conditional<__lvalref::value, __contiguous,
std::__false_type>::type;
#endif
return __foreign_iterator_aux3(__it, __other, __other_end, __tag());
}
/* Handle the case where we aren't really inserting a range after all */
template<typename _Iterator, typename _Sequence, typename _Integral>
inline bool
__foreign_iterator_aux(const _Safe_iterator<_Iterator, _Sequence>&,
_Integral, _Integral,
std::__true_type)
{ return true; }
/* Handle all iterators. */
template<typename _Iterator, typename _Sequence,
typename _InputIterator>
inline bool
__foreign_iterator_aux(const _Safe_iterator<_Iterator, _Sequence>& __it,
_InputIterator __other, _InputIterator __other_end,
std::__false_type)
{
return _Insert_range_from_self_is_safe<_Sequence>::__value
|| __foreign_iterator_aux2(__it, std::__miter_base(__other),
std::__miter_base(__other_end));
}
template<typename _Iterator, typename _Sequence,
typename _InputIterator>
inline bool
__foreign_iterator(const _Safe_iterator<_Iterator, _Sequence>& __it,
_InputIterator __other, _InputIterator __other_end)
{
typedef typename std::__is_integer<_InputIterator>::__type _Integral;
return __foreign_iterator_aux(__it, __other, __other_end, _Integral());
}
/** Checks that __s is non-NULL or __n == 0, and then returns __s. */
template<typename _CharT, typename _Integer>
inline const _CharT*
__check_string(const _CharT* __s,
const _Integer& __n __attribute__((__unused__)))
{
#ifdef _GLIBCXX_DEBUG_PEDANTIC
__glibcxx_assert(__s != 0 || __n == 0);
#endif
return __s;
}
/** Checks that __s is non-NULL and then returns __s. */
template<typename _CharT>
inline const _CharT*
__check_string(const _CharT* __s)
{
#ifdef _GLIBCXX_DEBUG_PEDANTIC
__glibcxx_assert(__s != 0);
#endif
return __s;
}
// Can't check if an input iterator sequence is sorted, because we
// can't step through the sequence.
template<typename _InputIterator>
inline bool
__check_sorted_aux(const _InputIterator&, const _InputIterator&,
std::input_iterator_tag)
{ return true; }
// Can verify if a forward iterator sequence is in fact sorted using
// std::__is_sorted
template<typename _ForwardIterator>
inline bool
__check_sorted_aux(_ForwardIterator __first, _ForwardIterator __last,
std::forward_iterator_tag)
{
if (__first == __last)
return true;
_ForwardIterator __next = __first;
for (++__next; __next != __last; __first = __next, (void)++__next)
if (*__next < *__first)
return false;
return true;
}
// Can't check if an input iterator sequence is sorted, because we can't step
// through the sequence.
template<typename _InputIterator, typename _Predicate>
inline bool
__check_sorted_aux(const _InputIterator&, const _InputIterator&,
_Predicate, std::input_iterator_tag)
{ return true; }
// Can verify if a forward iterator sequence is in fact sorted using
// std::__is_sorted
template<typename _ForwardIterator, typename _Predicate>
inline bool
__check_sorted_aux(_ForwardIterator __first, _ForwardIterator __last,
_Predicate __pred, std::forward_iterator_tag)
{
if (__first == __last)
return true;
_ForwardIterator __next = __first;
for (++__next; __next != __last; __first = __next, (void)++__next)
if (__pred(*__next, *__first))
return false;
return true;
}
// Determine if a sequence is sorted.
template<typename _InputIterator>
inline bool
__check_sorted(const _InputIterator& __first, const _InputIterator& __last)
{
// Verify that the < operator for elements in the sequence is a
// StrictWeakOrdering by checking that it is irreflexive.
__glibcxx_assert(__first == __last || !(*__first < *__first));
return __check_sorted_aux(__first, __last,
std::__iterator_category(__first));
}
template<typename _InputIterator, typename _Predicate>
inline bool
__check_sorted(const _InputIterator& __first, const _InputIterator& __last,
_Predicate __pred)
{
// Verify that the predicate is StrictWeakOrdering by checking that it
// is irreflexive.
__glibcxx_assert(__first == __last || !__pred(*__first, *__first));
return __check_sorted_aux(__first, __last, __pred,
std::__iterator_category(__first));
}
template<typename _InputIterator>
inline bool
__check_sorted_set_aux(const _InputIterator& __first,
const _InputIterator& __last,
std::__true_type)
{ return __check_sorted(__first, __last); }
template<typename _InputIterator>
inline bool
__check_sorted_set_aux(const _InputIterator&,
const _InputIterator&,
std::__false_type)
{ return true; }
template<typename _InputIterator, typename _Predicate>
inline bool
__check_sorted_set_aux(const _InputIterator& __first,
const _InputIterator& __last,
_Predicate __pred, std::__true_type)
{ return __check_sorted(__first, __last, __pred); }
template<typename _InputIterator, typename _Predicate>
inline bool
__check_sorted_set_aux(const _InputIterator&,
const _InputIterator&, _Predicate,
std::__false_type)
{ return true; }
// ... special variant used in std::merge, std::includes, std::set_*.
template<typename _InputIterator1, typename _InputIterator2>
inline bool
__check_sorted_set(const _InputIterator1& __first,
const _InputIterator1& __last,
const _InputIterator2&)
{
typedef typename std::iterator_traits<_InputIterator1>::value_type
_ValueType1;
typedef typename std::iterator_traits<_InputIterator2>::value_type
_ValueType2;
typedef typename std::__are_same<_ValueType1, _ValueType2>::__type
_SameType;
return __check_sorted_set_aux(__first, __last, _SameType());
}
template<typename _InputIterator1, typename _InputIterator2,
typename _Predicate>
inline bool
__check_sorted_set(const _InputIterator1& __first,
const _InputIterator1& __last,
const _InputIterator2&, _Predicate __pred)
{
typedef typename std::iterator_traits<_InputIterator1>::value_type
_ValueType1;
typedef typename std::iterator_traits<_InputIterator2>::value_type
_ValueType2;
typedef typename std::__are_same<_ValueType1, _ValueType2>::__type
_SameType;
return __check_sorted_set_aux(__first, __last, __pred, _SameType());
}
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 270. Binary search requirements overly strict
// Determine if a sequence is partitioned w.r.t. this element.
template<typename _ForwardIterator, typename _Tp>
inline bool
__check_partitioned_lower(_ForwardIterator __first,
_ForwardIterator __last, const _Tp& __value)
{
while (__first != __last && *__first < __value)
++__first;
if (__first != __last)
{
++__first;
while (__first != __last && !(*__first < __value))
++__first;
}
return __first == __last;
}
template<typename _ForwardIterator, typename _Tp>
inline bool
__check_partitioned_upper(_ForwardIterator __first,
_ForwardIterator __last, const _Tp& __value)
{
while (__first != __last && !(__value < *__first))
++__first;
if (__first != __last)
{
++__first;
while (__first != __last && __value < *__first)
++__first;
}
return __first == __last;
}
// Determine if a sequence is partitioned w.r.t. this element.
template<typename _ForwardIterator, typename _Tp, typename _Pred>
inline bool
__check_partitioned_lower(_ForwardIterator __first,
_ForwardIterator __last, const _Tp& __value,
_Pred __pred)
{
while (__first != __last && bool(__pred(*__first, __value)))
++__first;
if (__first != __last)
{
++__first;
while (__first != __last && !bool(__pred(*__first, __value)))
++__first;
}
return __first == __last;
}
template<typename _ForwardIterator, typename _Tp, typename _Pred>
inline bool
__check_partitioned_upper(_ForwardIterator __first,
_ForwardIterator __last, const _Tp& __value,
_Pred __pred)
{
while (__first != __last && !bool(__pred(__value, *__first)))
++__first;
if (__first != __last)
{
++__first;
while (__first != __last && bool(__pred(__value, *__first)))
++__first;
}
return __first == __last;
}
#if __cplusplus >= 201103L
struct _Irreflexive_checker
{
template<typename _It>
static typename std::iterator_traits<_It>::reference
__deref();
template<typename _It,
typename = decltype(__deref<_It>() < __deref<_It>())>
static bool
_S_is_valid(_It __it)
{ return !(*__it < *__it); }
// Fallback method if operator doesn't exist.
template<typename... _Args>
static bool
_S_is_valid(_Args...)
{ return true; }
template<typename _It, typename _Pred, typename
= decltype(std::declval<_Pred>()(__deref<_It>(), __deref<_It>()))>
static bool
_S_is_valid_pred(_It __it, _Pred __pred)
{ return !__pred(*__it, *__it); }
// Fallback method if predicate can't be invoked.
template<typename... _Args>
static bool
_S_is_valid_pred(_Args...)
{ return true; }
};
template<typename _Iterator>
inline bool
__is_irreflexive(_Iterator __it)
{ return _Irreflexive_checker::_S_is_valid(__it); }
template<typename _Iterator, typename _Pred>
inline bool
__is_irreflexive_pred(_Iterator __it, _Pred __pred)
{ return _Irreflexive_checker::_S_is_valid_pred(__it, __pred); }
#endif
} // namespace __gnu_debug
#endif