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// Copyright (C) 2015-2025 Jonathan Müller and foonathan/memory contributors
// SPDX-License-Identifier: Zlib
#ifndef FOONATHAN_MEMORY_DETAIL_LOWLEVEL_ALLOCATOR_HPP_INCLUDED
#define FOONATHAN_MEMORY_DETAIL_LOWLEVEL_ALLOCATOR_HPP_INCLUDED
#include <type_traits>
#include "../config.hpp"
#include "../error.hpp"
#include "align.hpp"
#include "debug_helpers.hpp"
#include "assert.hpp"
namespace foonathan
{
namespace memory
{
namespace detail
{
template <class Functor>
struct lowlevel_allocator_leak_handler
{
void operator()(std::ptrdiff_t amount)
{
debug_handle_memory_leak(Functor::info(), amount);
}
};
// Functor controls low-level allocation:
// static allocator_info info()
// static void* allocate(std::size_t size, std::size_t alignment);
// static void deallocate(void *memory, std::size_t size, std::size_t alignment);
// static std::size_t max_node_size();
template <class Functor>
class lowlevel_allocator : global_leak_checker<lowlevel_allocator_leak_handler<Functor>>
{
public:
using is_stateful = std::false_type;
lowlevel_allocator() noexcept {}
lowlevel_allocator(lowlevel_allocator&&) noexcept {}
~lowlevel_allocator() noexcept {}
lowlevel_allocator& operator=(lowlevel_allocator&&) noexcept
{
return *this;
}
void* allocate_node(std::size_t size, std::size_t alignment)
{
auto actual_size = size + (debug_fence_size ? 2 * max_alignment : 0u);
auto memory = Functor::allocate(actual_size, alignment);
if (!memory)
FOONATHAN_THROW(out_of_memory(Functor::info(), actual_size));
this->on_allocate(actual_size);
return debug_fill_new(memory, size, max_alignment);
}
void deallocate_node(void* node, std::size_t size, std::size_t alignment) noexcept
{
auto actual_size = size + (debug_fence_size ? 2 * max_alignment : 0u);
auto memory = debug_fill_free(node, size, max_alignment);
Functor::deallocate(memory, actual_size, alignment);
this->on_deallocate(actual_size);
}
std::size_t max_node_size() const noexcept
{
return Functor::max_node_size();
}
};
#define FOONATHAN_MEMORY_LL_ALLOCATOR_LEAK_CHECKER(functor, var_name) \
FOONATHAN_MEMORY_GLOBAL_LEAK_CHECKER(lowlevel_allocator_leak_handler<functor>, var_name)
} // namespace detail
} // namespace memory
} // namespace foonathan
#endif // FOONATHAN_MEMORY_DETAIL_LOWLEVEL_ALLOCATOR_HPP_INCLUDED
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