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hashtable_policy.h (__details::_Before_begin<>): New, combine a base node instance and an allocator.

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2012-11-01  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/hashtable_policy.h (__details::_Before_begin<>):
	New, combine a base node instance and an allocator.
	* include/bits/hashtable.h (_Hashtable<>::_M_node_allocator): Remove.
	(_Hashtable<>::_M_before_begin): Rename into _M_bbegin and type
	modified to __detail::_Before_begin<>.
	(_Hashtable<>::_M_node_allocator()): New, get the node allocator
	part of _M_bbegin.
	(_Hashtable<>::_M_before_begin()): New, get the before begin node
	part of _M_bbegin.
	(_Hashtable<>): Adapt to use latter.

From-SVN: r193068
This commit is contained in:
François Dumont 2012-11-01 20:55:51 +00:00
parent 647d030f8c
commit 0dd4969120
3 changed files with 88 additions and 44 deletions
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13
libstdc++-v3/ChangeLog
View File

@ -1,3 +1,16 @@
2012-11-01 François Dumont <fdumont@gcc.gnu.org>
* include/bits/hashtable_policy.h (__details::_Before_begin<>):
New, combine a base node instance and an allocator.
* include/bits/hashtable.h (_Hashtable<>::_M_node_allocator): Remove.
(_Hashtable<>::_M_before_begin): Rename into _M_bbegin and type
modified to __detail::_Before_begin<>.
(_Hashtable<>::_M_node_allocator()): New, get the node allocator
part of _M_bbegin.
(_Hashtable<>::_M_before_begin()): New, get the before begin node
part of _M_bbegin.
(_Hashtable<>): Adapt to use latter.
2012-11-01 Jonathan Wakely <jwakely.gcc@gmail.com>
* include/bits/forward_list.h (forward_list::assign): Dispatch to new

101
libstdc++-v3/include/bits/hashtable.h
View File

@ -99,7 +99,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* Each _Hashtable data structure has:
*
* - _Bucket[] _M_buckets
* - _Hash_node_base _M_before_begin
* - _Hash_node_base _M_bbegin
* - size_type _M_bucket_count
* - size_type _M_element_count
*
@ -302,17 +302,31 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_Node_allocator_type;
typedef typename _Alloc::template rebind<__bucket_type>::other
_Bucket_allocator_type;
typedef typename _Alloc::template rebind<value_type>::other
_Value_allocator_type;
using __before_begin = __detail::_Before_begin<_Node_allocator_type>;
_Node_allocator_type _M_node_allocator;
__bucket_type* _M_buckets;
size_type _M_bucket_count;
__node_base _M_before_begin;
__before_begin _M_bbegin;
size_type _M_element_count;
_RehashPolicy _M_rehash_policy;
_Node_allocator_type&
_M_node_allocator()
{ return _M_bbegin; }
const _Node_allocator_type&
_M_node_allocator() const
{ return _M_bbegin; }
__node_base&
_M_before_begin()
{ return _M_bbegin._M_node; }
const __node_base&
_M_before_begin() const
{ return _M_bbegin._M_node; }
template<typename... _Args>
__node_type*
_M_allocate_node(_Args&&... __args);
@ -337,7 +351,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
__node_type*
_M_begin() const
{ return static_cast<__node_type*>(_M_before_begin._M_nxt); }
{ return static_cast<__node_type*>(_M_before_begin()._M_nxt); }
public:
// Constructor, destructor, assignment, swap
@ -455,11 +469,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
allocator_type
get_allocator() const noexcept
{ return allocator_type(_M_node_allocator); }
{ return allocator_type(_M_node_allocator()); }
size_type
max_size() const noexcept
{ return _M_node_allocator.max_size(); }
{ return _M_node_allocator().max_size(); }
// Observers
key_equal
@ -685,15 +699,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
_M_allocate_node(_Args&&... __args)
{
__node_type* __n = _M_node_allocator.allocate(1);
__node_type* __n = _M_node_allocator().allocate(1);
__try
{
_M_node_allocator.construct(__n, std::forward<_Args>(__args)...);
_M_node_allocator().construct(__n, std::forward<_Args>(__args)...);
return __n;
}
__catch(...)
{
_M_node_allocator.deallocate(__n, 1);
_M_node_allocator().deallocate(__n, 1);
__throw_exception_again;
}
}
@ -707,8 +721,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
_M_deallocate_node(__node_type* __n)
{
_M_node_allocator.destroy(__n);
_M_node_allocator.deallocate(__n, 1);
_M_node_allocator().destroy(__n);
_M_node_allocator().deallocate(__n, 1);
}
template<typename _Key, typename _Value,
@ -738,7 +752,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
_M_allocate_buckets(size_type __n)
{
_Bucket_allocator_type __alloc(_M_node_allocator);
_Bucket_allocator_type __alloc(_M_node_allocator());
__bucket_type* __p = __alloc.allocate(__n);
__builtin_memset(__p, 0, __n * sizeof(__bucket_type));
@ -754,7 +768,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_H1, _H2, _Hash, _RehashPolicy, _Traits>::
_M_deallocate_buckets(__bucket_type* __p, size_type __n)
{
_Bucket_allocator_type __alloc(_M_node_allocator);
_Bucket_allocator_type __alloc(_M_node_allocator());
__alloc.deallocate(__p, __n);
}
@ -786,8 +800,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
: __hashtable_base(__exk, __h1, __h2, __h, __eq),
__map_base(),
__rehash_base(),
_M_node_allocator(__a),
_M_bucket_count(0),
_M_bbegin(__a),
_M_element_count(0),
_M_rehash_policy()
{
@ -815,8 +829,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
: __hashtable_base(__exk, __h1, __h2, __h, __eq),
__map_base(),
__rehash_base(),
_M_node_allocator(__a),
_M_bucket_count(0),
_M_bbegin(__a),
_M_element_count(0),
_M_rehash_policy()
{
@ -854,15 +868,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
: __hashtable_base(__ht),
__map_base(__ht),
__rehash_base(__ht),
_M_node_allocator(__ht._M_node_allocator),
_M_bucket_count(__ht._M_bucket_count),
_M_bbegin(__ht._M_bbegin),
_M_element_count(__ht._M_element_count),
_M_rehash_policy(__ht._M_rehash_policy)
{
_M_buckets = _M_allocate_buckets(_M_bucket_count);
__try
{
if (!__ht._M_before_begin._M_nxt)
if (!__ht._M_before_begin()._M_nxt)
return;
// First deal with the special first node pointed to by
@ -870,8 +884,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
const __node_type* __ht_n = __ht._M_begin();
__node_type* __this_n = _M_allocate_node(__ht_n->_M_v);
this->_M_copy_code(__this_n, __ht_n);
_M_before_begin._M_nxt = __this_n;
_M_buckets[_M_bucket_index(__this_n)] = &_M_before_begin;
_M_before_begin()._M_nxt = __this_n;
_M_buckets[_M_bucket_index(__this_n)] = &_M_before_begin();
// Then deal with other nodes.
__node_base* __prev_n = __this_n;
@ -904,20 +918,19 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
: __hashtable_base(__ht),
__map_base(__ht),
__rehash_base(__ht),
_M_node_allocator(std::move(__ht._M_node_allocator)),
_M_buckets(__ht._M_buckets),
_M_bucket_count(__ht._M_bucket_count),
_M_before_begin(__ht._M_before_begin._M_nxt),
_M_bbegin(std::move(__ht._M_bbegin)),
_M_element_count(__ht._M_element_count),
_M_rehash_policy(__ht._M_rehash_policy)
{
// Update, if necessary, bucket pointing to before begin that hasn't move.
if (_M_begin())
_M_buckets[_M_bucket_index(_M_begin())] = &_M_before_begin;
_M_buckets[_M_bucket_index(_M_begin())] = &_M_before_begin();
__ht._M_rehash_policy = _RehashPolicy();
__ht._M_bucket_count = __ht._M_rehash_policy._M_next_bkt(0);
__ht._M_buckets = __ht._M_allocate_buckets(__ht._M_bucket_count);
__ht._M_before_begin._M_nxt = nullptr;
__ht._M_before_begin()._M_nxt = nullptr;
__ht._M_element_count = 0;
}
@ -949,22 +962,22 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 431. Swapping containers with unequal allocators.
std::__alloc_swap<_Node_allocator_type>::_S_do_it(_M_node_allocator,
__x._M_node_allocator);
std::__alloc_swap<_Node_allocator_type>::_S_do_it(_M_node_allocator(),
__x._M_node_allocator());
std::swap(_M_rehash_policy, __x._M_rehash_policy);
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_before_begin()._M_nxt, __x._M_before_begin()._M_nxt);
std::swap(_M_element_count, __x._M_element_count);
// 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;
_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);
= &(__x._M_before_begin());
}
template<typename _Key, typename _Value,
@ -1165,13 +1178,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// The bucket is empty, the new node is inserted at the
// beginning of the singly linked list and the bucket will
// contain _M_before_begin pointer.
__node->_M_nxt = _M_before_begin._M_nxt;
_M_before_begin._M_nxt = __node;
__node->_M_nxt = _M_before_begin()._M_nxt;
_M_before_begin()._M_nxt = __node;
if (__node->_M_nxt)
// We must update former begin bucket that is pointing to
// _M_before_begin.
_M_buckets[_M_bucket_index(__node->_M_next())] = __node;
_M_buckets[__bkt] = &_M_before_begin;
_M_buckets[__bkt] = &_M_before_begin();
}
}
@ -1193,8 +1206,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_M_buckets[__next_bkt] = _M_buckets[__bkt];
// Second update before begin node if necessary
if (&_M_before_begin == _M_buckets[__bkt])
_M_before_begin._M_nxt = __next;
if (&_M_before_begin() == _M_buckets[__bkt])
_M_before_begin()._M_nxt = __next;
_M_buckets[__bkt] = nullptr;
}
}
@ -1614,7 +1627,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_M_deallocate_nodes(_M_begin());
__builtin_memset(_M_buckets, 0, _M_bucket_count * sizeof(__bucket_type));
_M_element_count = 0;
_M_before_begin._M_nxt = nullptr;
_M_before_begin()._M_nxt = nullptr;
}
template<typename _Key, typename _Value,
@ -1677,7 +1690,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{
__bucket_type* __new_buckets = _M_allocate_buckets(__n);
__node_type* __p = _M_begin();
_M_before_begin._M_nxt = nullptr;
_M_before_begin()._M_nxt = nullptr;
std::size_t __bbegin_bkt;
while (__p)
{
@ -1685,9 +1698,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
std::size_t __bkt = __hash_code_base::_M_bucket_index(__p, __n);
if (!__new_buckets[__bkt])
{
__p->_M_nxt = _M_before_begin._M_nxt;
_M_before_begin._M_nxt = __p;
__new_buckets[__bkt] = &_M_before_begin;
__p->_M_nxt = _M_before_begin()._M_nxt;
_M_before_begin()._M_nxt = __p;
__new_buckets[__bkt] = &_M_before_begin();
if (__p->_M_nxt)
__new_buckets[__bbegin_bkt] = __p;
__bbegin_bkt = __bkt;
@ -1718,7 +1731,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
__bucket_type* __new_buckets = _M_allocate_buckets(__n);
__node_type* __p = _M_begin();
_M_before_begin._M_nxt = nullptr;
_M_before_begin()._M_nxt = nullptr;
std::size_t __bbegin_bkt;
std::size_t __prev_bkt;
__node_type* __prev_p = nullptr;
@ -1763,9 +1776,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
if (!__new_buckets[__bkt])
{
__p->_M_nxt = _M_before_begin._M_nxt;
_M_before_begin._M_nxt = __p;
__new_buckets[__bkt] = &_M_before_begin;
__p->_M_nxt = _M_before_begin()._M_nxt;
_M_before_begin()._M_nxt = __p;
__new_buckets[__bkt] = &_M_before_begin();
if (__p->_M_nxt)
__new_buckets[__bbegin_bkt] = __p;
__bbegin_bkt = __bkt;

18
libstdc++-v3/include/bits/hashtable_policy.h
View File

@ -1708,6 +1708,24 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
return true;
}
/**
* This type is to combine a _Hash_node_base instance with an allocator
* instance through inheritance to benefit from EBO when possible.
*/
template<typename _NodeAlloc>
struct _Before_begin : public _NodeAlloc
{
_Hash_node_base _M_node;
_Before_begin(const _Before_begin&) = default;
_Before_begin(_Before_begin&&) = default;
template<typename _Alloc>
_Before_begin(_Alloc&& __a)
: _NodeAlloc(std::forward<_Alloc>(__a))
{ }
};
//@} hashtable-detail
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace __detail