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re PR libstdc++/63698 (std::set leaks nodes on assignment)

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2014-11-04  François Dumont  <fdumont@gcc.gnu.org>
	    Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/63698
	* include/bits/stl_tree.h (_Reuse_or_alloc_node): Simplify constructor.
	Always move to the left node if there is one.
	* testsuite/23_containers/set/allocator/move_assign.cc (test04): New.

Co-Authored-By: Jonathan Wakely <jwakely@redhat.com>

From-SVN: r217154
This commit is contained in:
François Dumont 2014-11-05 19:16:13 +00:00
parent e028b0bbca
commit 6c52b7dfc4
3 changed files with 61 additions and 11 deletions
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8
libstdc++-v3/ChangeLog
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@ -1,3 +1,11 @@
2014-11-05 François Dumont <fdumont@gcc.gnu.org>
Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/63698
* include/bits/stl_tree.h (_Reuse_or_alloc_node): Simplify constructor.
Always move to the left node if there is one.
* testsuite/23_containers/set/allocator/move_assign.cc (test04): New.
2014-11-04 Jonathan Wakely <jwakely@redhat.com>
* include/bits/unique_ptr.h (make_unique): Use alias for trait.

29
libstdc++-v3/include/bits/stl_tree.h
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@ -359,16 +359,20 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
typedef const _Rb_tree_node<_Val>* _Const_Link_type;
private:
// Functor recycling a pool of nodes and using allocation once the pool is
// empty.
// Functor recycling a pool of nodes and using allocation once the pool
// is empty.
struct _Reuse_or_alloc_node
{
_Reuse_or_alloc_node(const _Rb_tree_node_base& __header,
_Rb_tree& __t)
: _M_root(__header._M_parent), _M_nodes(__header._M_right), _M_t(__t)
_Reuse_or_alloc_node(_Rb_tree& __t)
: _M_root(__t._M_root()), _M_nodes(__t._M_rightmost()), _M_t(__t)
{
if (_M_root)
_M_root->_M_parent = 0;
{
_M_root->_M_parent = 0;
if (_M_nodes->_M_left)
_M_nodes = _M_nodes->_M_left;
}
else
_M_nodes = 0;
}
@ -420,6 +424,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
while (_M_nodes->_M_right)
_M_nodes = _M_nodes->_M_right;
if (_M_nodes->_M_left)
_M_nodes = _M_nodes->_M_left;
}
}
else // __node is on the left.
@ -436,7 +443,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_Rb_tree& _M_t;
};
// Functor similar to the previous one but without any pool of node to
// Functor similar to the previous one but without any pool of nodes to
// recycle.
struct _Alloc_node
{
@ -1271,7 +1278,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Try to move each node reusing existing nodes and copying __x nodes
// structure.
_Reuse_or_alloc_node __roan(_M_impl._M_header, *this);
_Reuse_or_alloc_node __roan(*this);
_M_impl._M_reset();
if (__x._M_root() != nullptr)
{
@ -1297,7 +1304,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
_M_assign_unique(_Iterator __first, _Iterator __last)
{
_Reuse_or_alloc_node __roan(this->_M_impl._M_header, *this);
_Reuse_or_alloc_node __roan(*this);
_M_impl._M_reset();
for (; __first != __last; ++__first)
_M_insert_unique_(end(), *__first, __roan);
@ -1310,7 +1317,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
_M_assign_equal(_Iterator __first, _Iterator __last)
{
_Reuse_or_alloc_node __roan(this->_M_impl._M_header, *this);
_Reuse_or_alloc_node __roan(*this);
_M_impl._M_reset();
for (; __first != __last; ++__first)
_M_insert_equal_(end(), *__first, __roan);
@ -1342,7 +1349,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
#endif
_Reuse_or_alloc_node __roan(this->_M_impl._M_header, *this);
_Reuse_or_alloc_node __roan(*this);
_M_impl._M_reset();
_M_impl._M_key_compare = __x._M_impl._M_key_compare;
if (__x._M_root() != 0)

35
libstdc++-v3/testsuite/23_containers/set/allocator/move_assign.cc
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@ -18,6 +18,8 @@
// { dg-options "-std=gnu++11" }
#include <set>
#include <random>
#include <testsuite_hooks.h>
#include <testsuite_allocator.h>
@ -89,10 +91,43 @@ void test03()
VERIFY( tracker_allocator_counter::get_construct_count() == constructs + 2 );
}
void test04()
{
bool test __attribute__((unused)) = true;
using namespace __gnu_test;
typedef tracker_allocator<int> alloc_type;
typedef std::set<int, std::less<int>, alloc_type> test_type;
std::mt19937 rng;
std::uniform_int_distribution<int> d;
std::uniform_int_distribution<int>::param_type p{0, 100};
std::uniform_int_distribution<int>::param_type x{0, 1000};
for (int i = 0; i < 10; ++i)
{
test_type l, r;
for (int n = d(rng, p); n > 0; --n)
{
int i = d(rng, x);
l.insert(i);
r.insert(i);
tracker_allocator_counter::reset();
l = r;
VERIFY( tracker_allocator_counter::get_allocation_count() == 0 );
}
}
}
int main()
{
test01();
test02();
test03();
test04();
return 0;
}