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re PR libstdc++/61143 (Arithmetic exception on emplacing into unordered_map moved out)

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2014-05-21  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/61143
	* include/bits/hashtable.h: Fix move semantic to leave hashtable in a
	usable state.
	* testsuite/23_containers/unordered_set/61143.cc: New.
	* testsuite/23_containers/unordered_set/modifiers/swap.cc: New.

From-SVN: r210726
This commit is contained in:
François Dumont 2014-05-21 19:51:05 +00:00
parent 9652331a6b
commit 95539f21f5
4 changed files with 210 additions and 47 deletions
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8
libstdc++-v3/ChangeLog
View File

@ -1,3 +1,11 @@
2014-05-21 François Dumont <fdumont@gcc.gnu.org>
PR libstdc++/61143
* include/bits/hashtable.h: Fix move semantic to leave hashtable in a
usable state.
* testsuite/23_containers/unordered_set/61143.cc: New.
* testsuite/23_containers/unordered_set/modifiers/swap.cc: New.
2014-05-21 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/61269

146
libstdc++-v3/include/bits/hashtable.h
View File

@ -316,14 +316,49 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
size_type _M_element_count;
_RehashPolicy _M_rehash_policy;
// A single bucket used when only need for 1 bucket. Especially
// interesting in move semantic to leave hashtable with only 1 buckets
// which is not allocated so that we can have those operations noexcept
// qualified.
// Note that we can't leave hashtable with 0 bucket without adding
// numerous checks in the code to avoid 0 modulus.
__bucket_type _M_single_bucket;
bool
_M_uses_single_bucket(__bucket_type* __bkts) const
{ return __builtin_expect(_M_buckets == &_M_single_bucket, false); }
bool
_M_uses_single_bucket() const
{ return _M_uses_single_bucket(_M_buckets); }
__hashtable_alloc&
_M_base_alloc() { return *this; }
using __hashtable_alloc::_M_deallocate_buckets;
__bucket_type*
_M_allocate_buckets(size_type __n)
{
if (__builtin_expect(__n == 1, false))
{
_M_single_bucket = nullptr;
return &_M_single_bucket;
}
return __hashtable_alloc::_M_allocate_buckets(__n);
}
void
_M_deallocate_buckets(__bucket_type* __bkts, size_type __n)
{
if (_M_uses_single_bucket(__bkts))
return;
__hashtable_alloc::_M_deallocate_buckets(__bkts, __n);
}
void
_M_deallocate_buckets()
{ this->_M_deallocate_buckets(_M_buckets, _M_bucket_count); }
{ _M_deallocate_buckets(_M_buckets, _M_bucket_count); }
// Gets bucket begin, deals with the fact that non-empty buckets contain
// their before begin node.
@ -703,11 +738,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
size_type
erase(const key_type& __k)
{
if (__builtin_expect(_M_bucket_count == 0, false))
return 0;
return _M_erase(__unique_keys(), __k);
}
{ return _M_erase(__unique_keys(), __k); }
iterator
erase(const_iterator, const_iterator);
@ -768,7 +799,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_M_rehash_policy()
{
_M_bucket_count = _M_rehash_policy._M_next_bkt(__bucket_hint);
_M_buckets = this->_M_allocate_buckets(_M_bucket_count);
_M_buckets = _M_allocate_buckets(_M_bucket_count);
}
template<typename _Key, typename _Value,
@ -796,7 +827,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
std::max(_M_rehash_policy._M_bkt_for_elements(__nb_elems),
__bucket_hint));
_M_buckets = this->_M_allocate_buckets(_M_bucket_count);
_M_buckets = _M_allocate_buckets(_M_bucket_count);
__try
{
for (; __f != __l; ++__f)
@ -833,9 +864,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{
// Replacement allocator cannot free existing storage.
this->_M_deallocate_nodes(_M_begin());
if (__builtin_expect(_M_bucket_count != 0, true))
_M_deallocate_buckets();
_M_reset();
_M_before_begin._M_nxt = nullptr;
_M_deallocate_buckets();
_M_buckets = nullptr;
std::__alloc_on_copy(__this_alloc, __that_alloc);
__hashtable_base::operator=(__ht);
_M_bucket_count = __ht._M_bucket_count;
@ -867,7 +898,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
if (_M_bucket_count != __ht._M_bucket_count)
{
__former_buckets = _M_buckets;
_M_buckets = this->_M_allocate_buckets(__ht._M_bucket_count);
_M_buckets = _M_allocate_buckets(__ht._M_bucket_count);
_M_bucket_count = __ht._M_bucket_count;
}
else
@ -885,8 +916,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
[&__roan](const __node_type* __n)
{ return __roan(__n->_M_v()); });
if (__former_buckets)
this->_M_deallocate_buckets(__former_buckets,
__former_bucket_count);
_M_deallocate_buckets(__former_buckets, __former_bucket_count);
}
__catch(...)
{
@ -917,7 +947,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{
__bucket_type* __buckets = nullptr;
if (!_M_buckets)
_M_buckets = __buckets = this->_M_allocate_buckets(_M_bucket_count);
_M_buckets = __buckets = _M_allocate_buckets(_M_bucket_count);
__try
{
@ -964,8 +994,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_M_reset() noexcept
{
_M_rehash_policy._M_reset();
_M_bucket_count = 0;
_M_buckets = nullptr;
_M_bucket_count = 1;
_M_single_bucket = nullptr;
_M_buckets = &_M_single_bucket;
_M_before_begin._M_nxt = nullptr;
_M_element_count = 0;
}
@ -980,12 +1011,16 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_M_move_assign(_Hashtable&& __ht, std::true_type)
{
this->_M_deallocate_nodes(_M_begin());
if (__builtin_expect(_M_bucket_count != 0, true))
_M_deallocate_buckets();
_M_deallocate_buckets();
__hashtable_base::operator=(std::move(__ht));
_M_rehash_policy = __ht._M_rehash_policy;
_M_buckets = __ht._M_buckets;
if (!__ht._M_uses_single_bucket())
_M_buckets = __ht._M_buckets;
else
{
_M_buckets = &_M_single_bucket;
_M_single_bucket = __ht._M_single_bucket;
}
_M_bucket_count = __ht._M_bucket_count;
_M_before_begin._M_nxt = __ht._M_before_begin._M_nxt;
_M_element_count = __ht._M_element_count;
@ -1019,7 +1054,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
if (_M_bucket_count != __ht._M_bucket_count)
{
__former_buckets = _M_buckets;
_M_buckets = this->_M_allocate_buckets(__ht._M_bucket_count);
_M_buckets = _M_allocate_buckets(__ht._M_bucket_count);
_M_bucket_count = __ht._M_bucket_count;
}
else
@ -1093,10 +1128,18 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_M_element_count(__ht._M_element_count),
_M_rehash_policy(__ht._M_rehash_policy)
{
// Update, if necessary, buckets if __ht is using its single bucket.
if (__ht._M_uses_single_bucket())
{
_M_buckets = &_M_single_bucket;
_M_single_bucket = __ht._M_single_bucket;
}
// Update, if necessary, bucket pointing to before begin that hasn't
// moved.
if (_M_begin())
_M_buckets[_M_bucket_index(_M_begin())] = &_M_before_begin;
__ht._M_reset();
}
@ -1139,7 +1182,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{
if (__ht._M_node_allocator() == this->_M_node_allocator())
{
_M_buckets = __ht._M_buckets;
if (__ht._M_uses_single_bucket())
{
_M_buckets = &_M_single_bucket;
_M_single_bucket = __ht._M_single_bucket;
}
else
_M_buckets = __ht._M_buckets;
_M_before_begin._M_nxt = __ht._M_before_begin._M_nxt;
// Update, if necessary, bucket pointing to before begin that hasn't
// moved.
@ -1189,15 +1239,34 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
std::__alloc_on_swap(this->_M_node_allocator(), __x._M_node_allocator());
std::swap(_M_rehash_policy, __x._M_rehash_policy);
std::swap(_M_buckets, __x._M_buckets);
// Deal properly with potentially moved instances.
if (this->_M_uses_single_bucket())
{
if (!__x._M_uses_single_bucket())
{
_M_buckets = __x._M_buckets;
__x._M_buckets = &__x._M_single_bucket;
}
}
else if (__x._M_uses_single_bucket())
{
__x._M_buckets = _M_buckets;
_M_buckets = &_M_single_bucket;
}
else
std::swap(_M_buckets, __x._M_buckets);
std::swap(_M_bucket_count, __x._M_bucket_count);
std::swap(_M_before_begin._M_nxt, __x._M_before_begin._M_nxt);
std::swap(_M_element_count, __x._M_element_count);
std::swap(_M_single_bucket, __x._M_single_bucket);
// Fix buckets containing the _M_before_begin pointers that can't be
// swapped.
if (_M_begin())
_M_buckets[_M_bucket_index(_M_begin())] = &_M_before_begin;
if (__x._M_begin())
__x._M_buckets[__x._M_bucket_index(__x._M_begin())]
= &__x._M_before_begin;
@ -1230,9 +1299,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
find(const key_type& __k)
{
if (__builtin_expect(_M_bucket_count == 0, false))
return end();
__hash_code __code = this->_M_hash_code(__k);
std::size_t __n = _M_bucket_index(__k, __code);
__node_type* __p = _M_find_node(__n, __k, __code);
@ -1250,9 +1316,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
find(const key_type& __k) const
{
if (__builtin_expect(_M_bucket_count == 0, false))
return end();
__hash_code __code = this->_M_hash_code(__k);
std::size_t __n = _M_bucket_index(__k, __code);
__node_type* __p = _M_find_node(__n, __k, __code);
@ -1270,9 +1333,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
count(const key_type& __k) const
{
if (__builtin_expect(_M_bucket_count == 0, false))
return 0;
__hash_code __code = this->_M_hash_code(__k);
std::size_t __n = _M_bucket_index(__k, __code);
__node_type* __p = _M_bucket_begin(__n);
@ -1287,7 +1347,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
else if (__result)
// All equivalent values are next to each other, if we
// found a non-equivalent value after an equivalent one it
// means that we won't find any more equivalent values.
// means that we won't find any new equivalent value.
break;
if (!__p->_M_nxt || _M_bucket_index(__p->_M_next()) != __n)
break;
@ -1311,9 +1371,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
equal_range(const key_type& __k)
{
if (__builtin_expect(_M_bucket_count == 0, false))
return std::make_pair(end(), end());
__hash_code __code = this->_M_hash_code(__k);
std::size_t __n = _M_bucket_index(__k, __code);
__node_type* __p = _M_find_node(__n, __k, __code);
@ -1347,9 +1404,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
equal_range(const key_type& __k) const
{
if (__builtin_expect(_M_bucket_count == 0, false))
return std::make_pair(end(), end());
__hash_code __code = this->_M_hash_code(__k);
std::size_t __n = _M_bucket_index(__k, __code);
__node_type* __p = _M_find_node(__n, __k, __code);
@ -1944,7 +1998,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
_M_rehash_aux(size_type __n, std::true_type)
{
__bucket_type* __new_buckets = this->_M_allocate_buckets(__n);
__bucket_type* __new_buckets = _M_allocate_buckets(__n);
__node_type* __p = _M_begin();
_M_before_begin._M_nxt = nullptr;
std::size_t __bbegin_bkt = 0;
@ -1969,8 +2023,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
__p = __next;
}
if (__builtin_expect(_M_bucket_count != 0, true))
_M_deallocate_buckets();
_M_deallocate_buckets();
_M_bucket_count = __n;
_M_buckets = __new_buckets;
}
@ -1986,7 +2039,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
_M_rehash_aux(size_type __n, std::false_type)
{
__bucket_type* __new_buckets = this->_M_allocate_buckets(__n);
__bucket_type* __new_buckets = _M_allocate_buckets(__n);
__node_type* __p = _M_begin();
_M_before_begin._M_nxt = nullptr;
@ -2060,8 +2113,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
__new_buckets[__next_bkt] = __prev_p;
}
if (__builtin_expect(_M_bucket_count != 0, true))
_M_deallocate_buckets();
_M_deallocate_buckets();
_M_bucket_count = __n;
_M_buckets = __new_buckets;
}

38
libstdc++-v3/testsuite/23_containers/unordered_set/61143.cc Normal file
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@ -0,0 +1,38 @@
// { dg-options "-std=gnu++11" }
// Copyright (C) 2014 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/>.
// libstdc++/61143
#include <unordered_set>
void test01()
{
std::unordered_set<int> us1, us2;
us1.insert(1);
us2 = std::move(us1);
us1.insert(1);
}
int main()
{
test01();
return 0;
}

65
libstdc++-v3/testsuite/23_containers/unordered_set/modifiers/swap.cc Normal file
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@ -0,0 +1,65 @@
// Copyright (C) 2014 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-options "-std=gnu++11" }
#include <unordered_set>
#include <testsuite_hooks.h>
void test01()
{
bool test __attribute__((unused)) = true;
std::unordered_set<int> us1 { 0, 1 };
{
std::unordered_set<int> us2(std::move(us1));
us1.swap(us2);
VERIFY( us1.find(0) != us1.end() );
us1.insert(2);
VERIFY( us1.size() == 3 );
us2.swap(us1);
VERIFY( us2.size() == 3 );
VERIFY( us2.find(2) != us2.end() );
us1 = { 3, 4, 5 };
VERIFY( us1.size() == 3 );
VERIFY( us1.bucket_count() >= 3 );
std::unordered_set<int> us3(std::move(us1));
us3 = std::move(us2);
us1.swap(us2);
VERIFY( us1.empty() );
VERIFY( us2.empty() );
}
us1 = { 0, 1 };
VERIFY( us1.size() == 2 );
}
int main()
{
test01();
return 0;
}