1 files changed, 291 insertions, 0 deletions
diff --git a/src/third_party/boost-1.60.0/libs/container/src/pool_resource.cpp b/src/third_party/boost-1.60.0/libs/container/src/pool_resource.cpp
new file mode 100644
index 00000000000..4df7ee2bae8
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+++ b/src/third_party/boost-1.60.0/libs/container/src/pool_resource.cpp
@@ -0,0 +1,291 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2015-2015. Distributed under the Boost
+// Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/container for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#define BOOST_CONTAINER_SOURCE
+#include <boost/container/detail/config_begin.hpp>
+#include <boost/container/detail/workaround.hpp>
+
+#include <boost/container/pmr/global_resource.hpp>
+
+#include <boost/container/detail/pool_resource.hpp>
+#include <boost/container/detail/block_slist.hpp>
+#include <boost/container/detail/min_max.hpp>
+#include <boost/container/detail/placement_new.hpp>
+#include <boost/intrusive/linear_slist_algorithms.hpp>
+#include <boost/intrusive/detail/math.hpp>
+
+#include <cstddef>
+
+namespace boost {
+namespace container {
+namespace pmr {
+
+//pool_data_t
+
+class pool_data_t
+   : public block_slist_base<>
+{
+   typedef block_slist_base<> block_slist_base;
+
+   public:
+   explicit pool_data_t(std::size_t initial_blocks_per_chunk)
+      : block_slist_base(), next_blocks_per_chunk(initial_blocks_per_chunk)
+   {  slist_algo::init_header(&free_slist);  }
+
+   void *allocate_block() BOOST_NOEXCEPT
+   {
+      if(slist_algo::unique(&free_slist)){
+         return 0;
+      }
+      slist_node *pv = slist_algo::node_traits::get_next(&free_slist);
+      slist_algo::unlink_after(&free_slist);
+      pv->~slist_node();
+      return pv;
+   }
+
+   void deallocate_block(void *p) BOOST_NOEXCEPT
+   {
+      slist_node *pv = ::new(p, boost_container_new_t()) slist_node();
+      slist_algo::link_after(&free_slist, pv);
+   }
+
+   void release(memory_resource &upstream)
+   {
+      slist_algo::init_header(&free_slist);
+      this->block_slist_base::release(upstream);
+      next_blocks_per_chunk = pool_options_minimum_max_blocks_per_chunk;
+   }
+
+   void replenish(memory_resource &mr, std::size_t pool_block, std::size_t max_blocks_per_chunk)
+   {
+      //Limit max value
+      std::size_t blocks_per_chunk = boost::container::container_detail::min_value(max_blocks_per_chunk, next_blocks_per_chunk);
+      //Avoid overflow
+      blocks_per_chunk = boost::container::container_detail::min_value(blocks_per_chunk, std::size_t(-1)/pool_block);
+      
+      //Minimum block size is at least max_align, so all pools allocate sizes that are multiple of max_align,
+      //meaning that all blocks are max_align-aligned.
+      char *p = static_cast<char *>(block_slist_base::allocate(blocks_per_chunk*pool_block, mr));
+
+      //Create header types. This is no-throw
+      for(std::size_t i = 0, max = blocks_per_chunk; i != max; ++i){
+         slist_node *const pv = ::new(p, boost_container_new_t()) slist_node();
+         slist_algo::link_after(&free_slist, pv);
+         p += pool_block;
+      }
+
+      //Update next block per chunk         
+      next_blocks_per_chunk = max_blocks_per_chunk/2u < blocks_per_chunk  ? max_blocks_per_chunk : blocks_per_chunk*2u;
+   }
+
+   std::size_t cache_count() const
+   {  return slist_algo::count(&free_slist) - 1u;  }
+
+   slist_node  free_slist;
+   std::size_t next_blocks_per_chunk;
+};
+
+//pool_resource
+
+//Detect overflow in ceil_pow2
+BOOST_STATIC_ASSERT(pool_options_default_max_blocks_per_chunk <= (std::size_t(-1)/2u+1u));
+//Sanity checks
+BOOST_STATIC_ASSERT(bi::detail::static_is_pow2<pool_options_default_max_blocks_per_chunk>::value);
+BOOST_STATIC_ASSERT(bi::detail::static_is_pow2<pool_options_minimum_largest_required_pool_block>::value);
+
+//unsynchronized_pool_resource
+
+void pool_resource::priv_limit_option(std::size_t &val, std::size_t min, std::size_t max) //static
+{
+   if(!val){
+      val = max;
+   }
+   else{
+      val = val < min ? min : boost::container::container_detail::min_value(val, max);
+   }
+}
+
+std::size_t pool_resource::priv_pool_index(std::size_t block_size) //static
+{
+   //For allocations equal or less than pool_options_minimum_largest_required_pool_block
+   //the smallest pool is used
+   block_size = boost::container::container_detail::max_value(block_size, pool_options_minimum_largest_required_pool_block);
+   return bi::detail::ceil_log2(block_size)
+      - bi::detail::ceil_log2(pool_options_minimum_largest_required_pool_block);
+}
+
+std::size_t pool_resource::priv_pool_block(std::size_t index)  //static
+{
+   //For allocations equal or less than pool_options_minimum_largest_required_pool_block
+   //the smallest pool is used
+   return pool_options_minimum_largest_required_pool_block << index;
+}
+
+void pool_resource::priv_fix_options()
+{
+   priv_limit_option(m_options.max_blocks_per_chunk
+                     , pool_options_minimum_max_blocks_per_chunk
+                     , pool_options_default_max_blocks_per_chunk);
+   priv_limit_option
+      ( m_options.largest_required_pool_block
+      , pool_options_minimum_largest_required_pool_block
+      , pool_options_default_largest_required_pool_block);
+   m_options.largest_required_pool_block = bi::detail::ceil_pow2(m_options.largest_required_pool_block);
+}
+
+void pool_resource::priv_init_pools()
+{
+   const std::size_t num_pools = priv_pool_index(m_options.largest_required_pool_block)+1u;
+   //Otherwise, just use the default alloc (zero pools)
+   void *p = 0;
+   //This can throw
+   p = m_upstream.allocate(sizeof(pool_data_t)*num_pools);
+   //This is nothrow
+   m_pool_data = static_cast<pool_data_t *>(p);
+   for(std::size_t i = 0, max = num_pools; i != max; ++i){
+      ::new(&m_pool_data[i], boost_container_new_t()) pool_data_t(pool_options_minimum_max_blocks_per_chunk);
+   }
+   m_pool_count = num_pools;
+}
+
+void pool_resource::priv_constructor_body()
+{
+   this->priv_fix_options();
+}
+
+pool_resource::pool_resource(const pool_options& opts, memory_resource* upstream) BOOST_NOEXCEPT
+   : m_options(opts), m_upstream(*upstream), m_oversized_list(), m_pool_data(), m_pool_count()
+{  this->priv_constructor_body();  }
+
+pool_resource::pool_resource() BOOST_NOEXCEPT
+   : m_options(), m_upstream(*get_default_resource()), m_oversized_list(), m_pool_data(), m_pool_count()
+{  this->priv_constructor_body();  }
+
+pool_resource::pool_resource(memory_resource* upstream) BOOST_NOEXCEPT
+   : m_options(), m_upstream(*upstream), m_oversized_list(), m_pool_data(), m_pool_count()
+{  this->priv_constructor_body();  }
+
+pool_resource::pool_resource(const pool_options& opts) BOOST_NOEXCEPT
+   : m_options(opts), m_upstream(*get_default_resource()), m_oversized_list(), m_pool_data(), m_pool_count()
+{  this->priv_constructor_body();  }
+
+pool_resource::~pool_resource() //virtual
+{
+   this->release();
+
+   for(std::size_t i = 0, max = m_pool_count; i != max; ++i){
+      m_pool_data[i].~pool_data_t();
+   }
+   if(m_pool_data){
+      m_upstream.deallocate((void*)m_pool_data, sizeof(pool_data_t)*m_pool_count);
+   }
+}
+
+void pool_resource::release()
+{
+   m_oversized_list.release(m_upstream);
+   for(std::size_t i = 0, max = m_pool_count; i != max; ++i)
+   {
+      m_pool_data[i].release(m_upstream);
+   }
+}
+
+memory_resource* pool_resource::upstream_resource() const
+{  return &m_upstream;  }
+
+pool_options pool_resource::options() const
+{  return m_options; }
+
+void* pool_resource::do_allocate(std::size_t bytes, std::size_t alignment) //virtual
+{
+   if(!m_pool_data){
+      this->priv_init_pools();
+   }
+   (void)alignment;  //alignment ignored here, max_align is used by pools
+   if(bytes > m_options.largest_required_pool_block){
+      return m_oversized_list.allocate(bytes, m_upstream);
+   }
+   else{
+      const std::size_t pool_idx = priv_pool_index(bytes);
+      pool_data_t & pool = m_pool_data[pool_idx];
+      void *p = pool.allocate_block();
+      if(!p){
+         pool.replenish(m_upstream, priv_pool_block(pool_idx), m_options.max_blocks_per_chunk);
+         p = pool.allocate_block();
+      }
+      return p;
+   }
+}
+
+void pool_resource::do_deallocate(void* p, std::size_t bytes, std::size_t alignment) //virtual
+{
+   (void)alignment;  //alignment ignored here, max_align is used by pools
+   if(bytes > m_options.largest_required_pool_block){
+      //Just cached
+      return m_oversized_list.deallocate(p, m_upstream);
+   }
+   else{
+      const std::size_t pool_idx = priv_pool_index(bytes);
+      return m_pool_data[pool_idx].deallocate_block(p);
+   }
+}
+
+bool pool_resource::do_is_equal(const memory_resource& other) const BOOST_NOEXCEPT //virtual
+{  return this == dynamic_cast<const pool_resource*>(&other);  }
+
+
+std::size_t pool_resource::pool_count() const
+{
+   if(BOOST_LIKELY((0 != m_pool_data))){
+      return m_pool_count;
+   }
+   else{
+      return priv_pool_index(m_options.largest_required_pool_block)+1u;
+   }
+}
+
+std::size_t pool_resource::pool_index(std::size_t bytes) const
+{
+   if(bytes > m_options.largest_required_pool_block){
+      return pool_count();
+   }
+   else{
+      return priv_pool_index(bytes);
+   }
+}
+
+std::size_t pool_resource::pool_next_blocks_per_chunk(std::size_t pool_idx) const
+{
+   if(BOOST_LIKELY((m_pool_data && pool_idx < m_pool_count))){
+      return m_pool_data[pool_idx].next_blocks_per_chunk;
+   }
+   else{
+      return 1u;
+   }
+}
+
+std::size_t pool_resource::pool_block(std::size_t pool_idx) const
+{  return priv_pool_block(pool_idx);  }
+
+std::size_t pool_resource::pool_cached_blocks(std::size_t pool_idx) const
+{
+   if(BOOST_LIKELY((m_pool_data && pool_idx < m_pool_count))){
+      return m_pool_data[pool_idx].cache_count();
+   }
+   else{
+      return 0u;
+   }
+}
+
+}  //namespace pmr {
+}  //namespace container {
+}  //namespace boost {
+
+#include <boost/container/detail/config_end.hpp>