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* [gcc r13-1991] libstdc++: [_GLIBCXX_DEBUG] Do not consider detached iterators as value-initialized
@ 2022-08-08 18:12 Franथईois Dumont
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From: Franथईois Dumont @ 2022-08-08 18:12 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:01b1afdc35c13cbff5cd3d37f9319285ab84b157
commit r13-1991-g01b1afdc35c13cbff5cd3d37f9319285ab84b157
Author: François Dumont <fdumont@gcc.gnu.org>
Date: Thu Jan 28 22:23:28 2021 +0100
libstdc++: [_GLIBCXX_DEBUG] Do not consider detached iterators as value-initialized
An attach iterator has its _M_version set to something != 0, the container version. This
value shall be preserved when detaching it so that the iterator does not look like a
value-initialized one.
libstdc++-v3/ChangeLog:
* include/debug/formatter.h (__singular_value_init): New _Iterator_state enum entry.
(_Parameter<>(const _Safe_iterator<>&, const char*, _Is_iterator)): Check if iterator
parameter is value-initialized.
(_Parameter<>(const _Safe_local_iterator<>&, const char*, _Is_iterator)): Likewise.
* include/debug/safe_iterator.h (_Safe_iterator<>::_M_value_initialized()): New. Adapt
checks.
* include/debug/safe_local_iterator.h (_Safe_local_iterator<>::_M_value_initialized()): New.
Adapt checks.
* src/c++11/debug.cc (_Safe_iterator_base::_M_reset): Do not reset _M_version.
(print_field(PrintContext&, const _Parameter&, const char*)): Adapt state_names.
* testsuite/23_containers/deque/debug/iterator1_neg.cc: New test.
* testsuite/23_containers/deque/debug/iterator2_neg.cc: New test.
* testsuite/23_containers/forward_list/debug/iterator1_neg.cc: New test.
* testsuite/23_containers/forward_list/debug/iterator2_neg.cc: New test.
* testsuite/23_containers/forward_list/debug/iterator3_neg.cc: New test.
Diff:
---
libstdc++-v3/include/debug/formatter.h | 15 +++++++-
libstdc++-v3/include/debug/safe_iterator.h | 19 +++++----
libstdc++-v3/include/debug/safe_local_iterator.h | 19 +++++----
libstdc++-v3/src/c++11/debug.cc | 7 +++-
.../23_containers/deque/debug/iterator1_neg.cc | 37 ++++++++++++++++++
.../23_containers/deque/debug/iterator2_neg.cc | 40 +++++++++++++++++++
.../forward_list/debug/iterator1_neg.cc | 37 ++++++++++++++++++
.../forward_list/debug/iterator2_neg.cc | 40 +++++++++++++++++++
.../forward_list/debug/iterator3_neg.cc | 45 ++++++++++++++++++++++
9 files changed, 241 insertions(+), 18 deletions(-)
diff --git a/libstdc++-v3/include/debug/formatter.h b/libstdc++-v3/include/debug/formatter.h
index 80e8ba46d1e..748d4fbfea4 100644
--- a/libstdc++-v3/include/debug/formatter.h
+++ b/libstdc++-v3/include/debug/formatter.h
@@ -185,6 +185,7 @@ namespace __gnu_debug
__rbegin, // dereferenceable, and at the reverse-beginning
__rmiddle, // reverse-dereferenceable, not at the reverse-beginning
__rend, // reverse-past-the-end
+ __singular_value_init, // singular, value initialized
__last_state
};
@@ -280,7 +281,12 @@ namespace __gnu_debug
_M_variant._M_iterator._M_seq_type = _GLIBCXX_TYPEID(_Sequence);
if (__it._M_singular())
- _M_variant._M_iterator._M_state = __singular;
+ {
+ if (__it._M_value_initialized())
+ _M_variant._M_iterator._M_state = __singular_value_init;
+ else
+ _M_variant._M_iterator._M_state = __singular;
+ }
else
{
if (__it._M_is_before_begin())
@@ -308,7 +314,12 @@ namespace __gnu_debug
_M_variant._M_iterator._M_seq_type = _GLIBCXX_TYPEID(_Sequence);
if (__it._M_singular())
- _M_variant._M_iterator._M_state = __singular;
+ {
+ if (__it._M_value_initialized())
+ _M_variant._M_iterator._M_state = __singular_value_init;
+ else
+ _M_variant._M_iterator._M_state = __singular;
+ }
else
{
if (__it._M_is_end())
diff --git a/libstdc++-v3/include/debug/safe_iterator.h b/libstdc++-v3/include/debug/safe_iterator.h
index d613933e236..33f7a86478a 100644
--- a/libstdc++-v3/include/debug/safe_iterator.h
+++ b/libstdc++-v3/include/debug/safe_iterator.h
@@ -41,8 +41,8 @@
#define _GLIBCXX_DEBUG_VERIFY_OPERANDS(_Lhs, _Rhs, _BadMsgId, _DiffMsgId) \
_GLIBCXX_DEBUG_VERIFY(!_Lhs._M_singular() && !_Rhs._M_singular() \
- || (_Lhs.base() == _Iterator() \
- && _Rhs.base() == _Iterator()), \
+ || (_Lhs._M_value_initialized() \
+ && _Rhs._M_value_initialized()), \
_M_message(_BadMsgId) \
._M_iterator(_Lhs, #_Lhs) \
._M_iterator(_Rhs, #_Rhs)); \
@@ -177,7 +177,7 @@ namespace __gnu_debug
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR 408. Is vector<reverse_iterator<char*> > forbidden?
_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
- || __x.base() == _Iterator(),
+ || __x._M_value_initialized(),
_M_message(__msg_init_copy_singular)
._M_iterator(*this, "this")
._M_iterator(__x, "other"));
@@ -193,7 +193,7 @@ namespace __gnu_debug
: _Iter_base()
{
_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
- || __x.base() == _Iterator(),
+ || __x._M_value_initialized(),
_M_message(__msg_init_copy_singular)
._M_iterator(*this, "this")
._M_iterator(__x, "other"));
@@ -220,7 +220,7 @@ namespace __gnu_debug
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR 408. Is vector<reverse_iterator<char*> > forbidden?
_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
- || __x.base() == _MutableIterator(),
+ || __x._M_value_initialized(),
_M_message(__msg_init_const_singular)
._M_iterator(*this, "this")
._M_iterator(__x, "other"));
@@ -236,7 +236,7 @@ namespace __gnu_debug
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR 408. Is vector<reverse_iterator<char*> > forbidden?
_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
- || __x.base() == _Iterator(),
+ || __x._M_value_initialized(),
_M_message(__msg_copy_singular)
._M_iterator(*this, "this")
._M_iterator(__x, "other"));
@@ -266,7 +266,7 @@ namespace __gnu_debug
operator=(_Safe_iterator&& __x) noexcept
{
_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
- || __x.base() == _Iterator(),
+ || __x._M_value_initialized(),
_M_message(__msg_copy_singular)
._M_iterator(*this, "this")
._M_iterator(__x, "other"));
@@ -405,6 +405,11 @@ namespace __gnu_debug
_M_incrementable() const
{ return !this->_M_singular() && !_M_is_end(); }
+ /// Is the iterator value-initialized?
+ bool
+ _M_value_initialized() const
+ { return _M_version == 0 && base() == _Iter_base(); }
+
// Can we advance the iterator @p __n steps (@p __n may be negative)
bool
_M_can_advance(difference_type __n, bool __strict = false) const;
diff --git a/libstdc++-v3/include/debug/safe_local_iterator.h b/libstdc++-v3/include/debug/safe_local_iterator.h
index b5318f50b6a..6e3c4eb1505 100644
--- a/libstdc++-v3/include/debug/safe_local_iterator.h
+++ b/libstdc++-v3/include/debug/safe_local_iterator.h
@@ -33,8 +33,8 @@
#define _GLIBCXX_DEBUG_VERIFY_OPERANDS(_Lhs, _Rhs) \
_GLIBCXX_DEBUG_VERIFY(!_Lhs._M_singular() && !_Rhs._M_singular() \
- || (_Lhs.base() == _Iterator{} \
- && _Rhs.base() == _Iterator{}), \
+ || (_Lhs._M_value_initialized() \
+ && _Rhs._M_value_initialized()), \
_M_message(__msg_iter_compare_bad) \
._M_iterator(_Lhs, "lhs") \
._M_iterator(_Rhs, "rhs")); \
@@ -127,7 +127,7 @@ namespace __gnu_debug
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR 408. Is vector<reverse_iterator<char*> > forbidden?
_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
- || __x.base() == _Iterator(),
+ || __x._M_value_initialized(),
_M_message(__msg_init_copy_singular)
._M_iterator(*this, "this")
._M_iterator(__x, "other"));
@@ -142,7 +142,7 @@ namespace __gnu_debug
: _Iter_base()
{
_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
- || __x.base() == _Iterator(),
+ || __x._M_value_initialized(),
_M_message(__msg_init_copy_singular)
._M_iterator(*this, "this")
._M_iterator(__x, "other"));
@@ -167,7 +167,7 @@ namespace __gnu_debug
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR 408. Is vector<reverse_iterator<char*> > forbidden?
_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
- || __x.base() == _MutableIterator(),
+ || __x._M_value_initialized(),
_M_message(__msg_init_const_singular)
._M_iterator(*this, "this")
._M_iterator(__x, "other"));
@@ -183,7 +183,7 @@ namespace __gnu_debug
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR 408. Is vector<reverse_iterator<char*> > forbidden?
_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
- || __x.base() == _Iterator(),
+ || __x._M_value_initialized(),
_M_message(__msg_copy_singular)
._M_iterator(*this, "this")
._M_iterator(__x, "other"));
@@ -212,7 +212,7 @@ namespace __gnu_debug
operator=(_Safe_local_iterator&& __x) noexcept
{
_GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
- || __x.base() == _Iterator(),
+ || __x._M_value_initialized(),
_M_message(__msg_copy_singular)
._M_iterator(*this, "this")
._M_iterator(__x, "other"));
@@ -343,6 +343,11 @@ namespace __gnu_debug
_M_incrementable() const
{ return !this->_M_singular() && !_M_is_end(); }
+ /// Is the iterator value-initialized?
+ bool
+ _M_value_initialized() const
+ { return _M_version == 0 && base() == _Iter_base{}; }
+
// Is the iterator range [*this, __rhs) valid?
bool
_M_valid_range(const _Safe_local_iterator& __rhs,
diff --git a/libstdc++-v3/src/c++11/debug.cc b/libstdc++-v3/src/c++11/debug.cc
index 4706defedf1..8ed61a69913 100644
--- a/libstdc++-v3/src/c++11/debug.cc
+++ b/libstdc++-v3/src/c++11/debug.cc
@@ -426,7 +426,9 @@ namespace __gnu_debug
_M_reset() throw ()
{
__atomic_store_n(&_M_sequence, (_Safe_sequence_base*)0, __ATOMIC_RELEASE);
- _M_version = 0;
+ // Do not reset version, so that a detached iterator does not look like a
+ // value-initialized one.
+ // _M_version = 0;
_M_prior = 0;
_M_next = 0;
}
@@ -767,7 +769,8 @@ namespace
"before-begin",
"dereferenceable (start-of-reverse-sequence)",
"dereferenceable (reverse)",
- "past-the-reverse-end"
+ "past-the-reverse-end",
+ "singular (value-initialized)"
};
print_word(ctx, state_names[iterator._M_state]);
}
diff --git a/libstdc++-v3/testsuite/23_containers/deque/debug/iterator1_neg.cc b/libstdc++-v3/testsuite/23_containers/deque/debug/iterator1_neg.cc
new file mode 100644
index 00000000000..73f8a044d43
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/deque/debug/iterator1_neg.cc
@@ -0,0 +1,37 @@
+// Copyright (C) 2022 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.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+//
+// { dg-do run { xfail *-*-* } }
+// { dg-require-debug-mode "" }
+
+#include <deque>
+
+void test01()
+{
+ typedef typename std::deque<int>::iterator It;
+ std::deque<int> dq;
+ dq.push_back(1);
+
+ It it = It();
+ (void)(dq.begin() != it);
+}
+
+int main()
+{
+ test01();
+ return 0;
+}
diff --git a/libstdc++-v3/testsuite/23_containers/deque/debug/iterator2_neg.cc b/libstdc++-v3/testsuite/23_containers/deque/debug/iterator2_neg.cc
new file mode 100644
index 00000000000..0abf5cbd4ec
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/deque/debug/iterator2_neg.cc
@@ -0,0 +1,40 @@
+// Copyright (C) 2022 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.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+//
+// { dg-do run { xfail *-*-* } }
+// { dg-require-debug-mode "" }
+
+#include <deque>
+
+void test01()
+{
+ typedef typename std::deque<int>::iterator It;
+ It it;
+ {
+ std::deque<int> dq;
+ it = dq.begin();
+ }
+
+ It value_init_it = It();
+ (void)(it != value_init_it);
+}
+
+int main()
+{
+ test01();
+ return 0;
+}
diff --git a/libstdc++-v3/testsuite/23_containers/forward_list/debug/iterator1_neg.cc b/libstdc++-v3/testsuite/23_containers/forward_list/debug/iterator1_neg.cc
new file mode 100644
index 00000000000..8ca44e248ed
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/forward_list/debug/iterator1_neg.cc
@@ -0,0 +1,37 @@
+// Copyright (C) 2022 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.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+//
+// { dg-do run { xfail *-*-* } }
+// { dg-require-debug-mode "" }
+
+#include <forward_list>
+
+void test01()
+{
+ typedef typename std::forward_list<int>::iterator It;
+ std::forward_list<int> fl;
+ fl.push_front(1);
+
+ It it = It();
+ (void)(fl.begin() != it);
+}
+
+int main()
+{
+ test01();
+ return 0;
+}
diff --git a/libstdc++-v3/testsuite/23_containers/forward_list/debug/iterator2_neg.cc b/libstdc++-v3/testsuite/23_containers/forward_list/debug/iterator2_neg.cc
new file mode 100644
index 00000000000..92ab059e6b8
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/forward_list/debug/iterator2_neg.cc
@@ -0,0 +1,40 @@
+// Copyright (C) 2022 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.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+//
+// { dg-do run { target c++11 xfail *-*-* } }
+// { dg-require-debug-mode "" }
+
+#include <forward_list>
+
+void test01()
+{
+ typedef typename std::forward_list<int>::iterator It;
+ It it;
+ {
+ std::forward_list<int> fl;
+ it = fl.begin();
+ }
+
+ It value_init_it{};
+ (void)(it != value_init_it);
+}
+
+int main()
+{
+ test01();
+ return 0;
+}
diff --git a/libstdc++-v3/testsuite/23_containers/forward_list/debug/iterator3_neg.cc b/libstdc++-v3/testsuite/23_containers/forward_list/debug/iterator3_neg.cc
new file mode 100644
index 00000000000..32ae7a5b7a6
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/forward_list/debug/iterator3_neg.cc
@@ -0,0 +1,45 @@
+// Copyright (C) 2022 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.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+//
+// { dg-do run { xfail *-*-* } }
+// { dg-require-debug-mode "" }
+
+#include <forward_list>
+
+#include <testsuite_hooks.h>
+
+void test01()
+{
+ typedef typename std::forward_list<int>::iterator It;
+ It end1, end2;
+
+ {
+ std::forward_list<int> fl;
+ fl.push_front(1);
+
+ end1 = end2 = fl.end();
+ VERIFY( end1 == end2 );
+ }
+
+ (void)(end1 == end2);
+}
+
+int main()
+{
+ test01();
+ return 0;
+}
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