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Use uninitialized memory for node-based containers to improve aliasing conformance

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Ion Gaztañaga
2018-09-26 01:10:37 +02:00
parent 1e509c308e
commit e787c4a24d
6 changed files with 311 additions and 128 deletions
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18
include/boost/container/vector.hpp
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@@ -1352,7 +1352,11 @@ class vector
//!
//! <b>Complexity</b>: Constant.
BOOST_CONTAINER_FORCEINLINE iterator end() BOOST_NOEXCEPT_OR_NOTHROW
{ return iterator(this->m_holder.start() + this->m_holder.m_size); }
{
pointer const bg = this->m_holder.start();
size_type const sz = this->m_holder.m_size;
return iterator(BOOST_LIKELY(sz) ? bg + sz : bg); //Avoid UB on null-pointer arithmetic
}
//! <b>Effects</b>: Returns a const_iterator to the end of the vector.
//!
@@ -1412,7 +1416,12 @@ class vector
//!
//! <b>Complexity</b>: Constant.
BOOST_CONTAINER_FORCEINLINE const_iterator cend() const BOOST_NOEXCEPT_OR_NOTHROW
{ return const_iterator(this->m_holder.start() + this->m_holder.m_size); }
{
pointer const bg = this->m_holder.start();
size_type const sz = this->m_holder.m_size;
return const_iterator(BOOST_LIKELY(sz) ? bg + sz : bg); //Avoid UB on null-pointer arithmetic
}
//{ return const_iterator(this->m_holder.start() + this->m_holder.m_size); }
//! <b>Effects</b>: Returns a const_reverse_iterator pointing to the beginning
//! of the reversed vector.
@@ -2037,9 +2046,10 @@ class vector
//! plus linear to the elements between pos and the last element.
iterator erase(const_iterator first, const_iterator last)
{
BOOST_ASSERT(first == last ||
(first < last && this->priv_in_range(first) && this->priv_in_range_or_end(last)));
if (first != last){
BOOST_ASSERT(this->priv_in_range(first));
BOOST_ASSERT(this->priv_in_range_or_end(last));
BOOST_ASSERT(first < last);
T* const old_end_ptr = this->priv_raw_end();
T* const first_ptr = boost::movelib::to_raw_pointer(vector_iterator_get_ptr(first));
T* const last_ptr = boost::movelib::to_raw_pointer(vector_iterator_get_ptr(last));