libstdc++: [_GLIBCXX_DEBUG] Complete deadlock fix on safe iterators [PR108288]

Complete fix on all _Safe_iterator post-increment and post-decrement implementations
and on _Safe_local_iterator.

libstdc++-v3/ChangeLog:

	PR libstdc++/108288
	* include/debug/safe_iterator.h (_Safe_iterator<>::operator++(int)): Extend deadlock
	fix to other iterator category.
	(_Safe_iterator<>::operator--(int)): Likewise.
	* include/debug/safe_local_iterator.h (_Safe_local_iterator<>::operator++(int)):
	Fix deadlock.
	* testsuite/util/debug/unordered_checks.h (invalid_local_iterator_pre_increment): New.
	(invalid_local_iterator_post_increment): New.
	* testsuite/23_containers/unordered_map/debug/invalid_local_iterator_post_increment_neg.cc:
	New test.
	* testsuite/23_containers/unordered_map/debug/invalid_local_iterator_pre_increment_neg.cc:
	New test.

5 files changed, 84 insertions, 40 deletions

diff --git a/libstdc++-v3/include/debug/safe_iterator.h b/libstdc++-v3/include/debug/safe_iterator.h
index f9068ea..755da7d 100644
--- a/libstdc++-v3/include/debug/safe_iterator.h
+++ b/libstdc++-v3/include/debug/safe_iterator.h
@@ -129,14 +129,6 @@ namespace __gnu_debug
 	typename _Sequence::_Base::iterator,
 	typename _Sequence::_Base::const_iterator>::__type _OtherIterator;
 
-      struct _Attach_single
-      { };
-
-      _Safe_iterator(_Iterator __i, _Safe_sequence_base* __seq, _Attach_single)
-      _GLIBCXX_NOEXCEPT
-      : _Iter_base(__i)
-      { _M_attach_single(__seq); }
-
     public:
       typedef _Iterator					iterator_type;
       typedef typename _Traits::iterator_category	iterator_category;
@@ -347,8 +339,9 @@ namespace __gnu_debug
 	_GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(),
 			      _M_message(__msg_bad_inc)
 			      ._M_iterator(*this, "this"));
-	__gnu_cxx::__scoped_lock __l(this->_M_get_mutex());
-	return _Safe_iterator(base()++, this->_M_sequence, _Attach_single());
+	_Safe_iterator __ret = *this;
+	++*this;
+	return __ret;
       }
 
       // ------ Utilities ------
@@ -520,12 +513,6 @@ namespace __gnu_debug
 
     protected:
       typedef typename _Safe_base::_OtherIterator _OtherIterator;
-      typedef typename _Safe_base::_Attach_single _Attach_single;
-
-      _Safe_iterator(_Iterator __i, _Safe_sequence_base* __seq, _Attach_single)
-      _GLIBCXX_NOEXCEPT
-      : _Safe_base(__i, __seq, _Attach_single())
-      { }
 
     public:
       /// @post the iterator is singular and unattached
@@ -609,9 +596,9 @@ namespace __gnu_debug
 	_GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(),
 			      _M_message(__msg_bad_inc)
 			      ._M_iterator(*this, "this"));
-	__gnu_cxx::__scoped_lock __l(this->_M_get_mutex());
-	return _Safe_iterator(this->base()++, this->_M_sequence,
-			      _Attach_single());
+	_Safe_iterator __ret = *this;
+	++*this;
+	return __ret;
       }
 
       // ------ Bidirectional iterator requirements ------
@@ -640,9 +627,9 @@ namespace __gnu_debug
 	_GLIBCXX_DEBUG_VERIFY(this->_M_decrementable(),
 			      _M_message(__msg_bad_dec)
 			      ._M_iterator(*this, "this"));
-	__gnu_cxx::__scoped_lock __l(this->_M_get_mutex());
-	return _Safe_iterator(this->base()--, this->_M_sequence,
-			      _Attach_single());
+	_Safe_iterator __ret = *this;
+	--*this;
+	return __ret;
       }
 
       // ------ Utilities ------
@@ -666,13 +653,6 @@ namespace __gnu_debug
       typedef _Safe_iterator<_OtherIterator, _Sequence,
 			     std::random_access_iterator_tag> _OtherSelf;
 
-      typedef typename _Safe_base::_Attach_single _Attach_single;
-
-      _Safe_iterator(_Iterator __i, _Safe_sequence_base* __seq, _Attach_single)
-      _GLIBCXX_NOEXCEPT
-      : _Safe_base(__i, __seq, _Attach_single())
-      { }
-
     public:
       typedef typename _Safe_base::difference_type	difference_type;
       typedef typename _Safe_base::reference		reference;
@@ -761,6 +741,9 @@ namespace __gnu_debug
       _Safe_iterator
       operator++(int) _GLIBCXX_NOEXCEPT
       {
+	_GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(),
+			      _M_message(__msg_bad_inc)
+			      ._M_iterator(*this, "this"));
 	_Safe_iterator __ret = *this;
 	++*this;
 	return __ret;
@@ -785,6 +768,9 @@ namespace __gnu_debug
       _Safe_iterator
       operator--(int) _GLIBCXX_NOEXCEPT
       {
+	_GLIBCXX_DEBUG_VERIFY(this->_M_decrementable(),
+			      _M_message(__msg_bad_dec)
+			      ._M_iterator(*this, "this"));
 	_Safe_iterator __ret = *this;
 	--*this;
 	return __ret;
diff --git a/libstdc++-v3/include/debug/safe_local_iterator.h b/libstdc++-v3/include/debug/safe_local_iterator.h
index 6e3c4eb..1079ee8 100644
--- a/libstdc++-v3/include/debug/safe_local_iterator.h
+++ b/libstdc++-v3/include/debug/safe_local_iterator.h
@@ -84,14 +84,6 @@ namespace __gnu_debug
       typedef _Safe_local_iterator _Self;
       typedef _Safe_local_iterator<_OtherIterator, _Sequence> _OtherSelf;
 
-      struct _Attach_single
-      { };
-
-      _Safe_local_iterator(_Iterator __i, _Safe_sequence_base* __cont,
-			   _Attach_single) noexcept
-      : _Iter_base(__i)
-      { _M_attach_single(__cont); }
-
     public:
       typedef _Iterator					iterator_type;
       typedef typename _Traits::iterator_category	iterator_category;
@@ -290,9 +282,9 @@ namespace __gnu_debug
 	_GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(),
 			      _M_message(__msg_bad_inc)
 			      ._M_iterator(*this, "this"));
-	__gnu_cxx::__scoped_lock __l(this->_M_get_mutex());
-	return _Safe_local_iterator(base()++, this->_M_sequence,
-				    _Attach_single());
+	_Safe_local_iterator __ret = *this;
+	++*this;
+	return __ret;
       }
 
       // ------ Utilities ------
diff --git a/libstdc++-v3/testsuite/23_containers/unordered_map/debug/invalid_local_iterator_post_increment_neg.cc b/libstdc++-v3/testsuite/23_containers/unordered_map/debug/invalid_local_iterator_post_increment_neg.cc
new file mode 100644
index 0000000..74005c3
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/unordered_map/debug/invalid_local_iterator_post_increment_neg.cc
@@ -0,0 +1,16 @@
+// { dg-do run { target c++11 xfail *-*-* } }
+// { dg-require-debug-mode "" }
+
+#include <unordered_map>
+#include <debug/unordered_checks.h>
+
+void test01()
+{
+  __gnu_test::invalid_local_iterator_post_increment<std::unordered_map<int, int>>();
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/23_containers/unordered_map/debug/invalid_local_iterator_pre_increment_neg.cc b/libstdc++-v3/testsuite/23_containers/unordered_map/debug/invalid_local_iterator_pre_increment_neg.cc
new file mode 100644
index 0000000..016cd1c
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/unordered_map/debug/invalid_local_iterator_pre_increment_neg.cc
@@ -0,0 +1,16 @@
+// { dg-do run { target c++11 xfail *-*-* } }
+// { dg-require-debug-mode "" }
+
+#include <unordered_map>
+#include <debug/unordered_checks.h>
+
+void test01()
+{
+  __gnu_test::invalid_local_iterator_pre_increment<std::unordered_map<int, int>>();
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/util/debug/unordered_checks.h b/libstdc++-v3/testsuite/util/debug/unordered_checks.h
index 655f16f..76ae05b 100644
--- a/libstdc++-v3/testsuite/util/debug/unordered_checks.h
+++ b/libstdc++-v3/testsuite/util/debug/unordered_checks.h
@@ -126,6 +126,40 @@ namespace __gnu_test
     }
 
   template<typename _Tp>
+    void invalid_local_iterator_pre_increment()
+    {
+      typedef _Tp cont_type;
+      typedef typename cont_type::value_type cont_val_type;
+      typedef typename CopyableValueType<cont_val_type>::value_type val_type;
+      generate_unique<val_type> gu;
+
+      cont_type c;
+      for (size_t i = 0; i != 5; ++i)
+	c.insert(gu.build());
+
+      auto lit = c.begin(0);
+      for (size_t i = 0; i != 6; ++i)
+	++lit;
+    }
+
+  template<typename _Tp>
+    void invalid_local_iterator_post_increment()
+    {
+      typedef _Tp cont_type;
+      typedef typename cont_type::value_type cont_val_type;
+      typedef typename CopyableValueType<cont_val_type>::value_type val_type;
+      generate_unique<val_type> gu;
+
+      cont_type c;
+      for (size_t i = 0; i != 5; ++i)
+	c.insert(gu.build());
+
+      auto lit = c.begin(0);
+      for (size_t i = 0; i != 6; ++i)
+	lit++;
+    }
+
+  template<typename _Tp>
     void invalid_local_iterator_compare()
     {
       typedef _Tp cont_type;