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// Copyright 2025, Amlal El Mahrouss (amlal@nekernel.org)
// 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)
// Official repository: https://github.com/ocl-foss-org/core
#ifndef OCL_TRACKED_PTR
#define OCL_TRACKED_PTR
#include "boost/assert/source_location.hpp"
#include <ocl/detail/config.hpp>
#include <atomic>
#include <stdexcept>
namespace ocl
{
template <typename Type>
class tracked_allocator
{
public:
std::atomic<std::size_t> allocated_count_{0};
std::atomic<std::size_t> deallocated_count_{0};
public:
explicit tracked_allocator() = default;
virtual ~tracked_allocator() = default;
tracked_allocator& operator=(const tracked_allocator&) = default;
tracked_allocator(const tracked_allocator&) = default;
public:
using pointer_type = Type*;
using type = Type;
template <typename... Args>
void retain(pointer_type& ptr, Args&&... args)
{
ptr = new type(std::forward<Args>(args)...);
if (ptr)
{
++allocated_count_;
return;
}
throw std::bad_alloc();
}
void dispose(pointer_type& ptr)
{
if (ptr)
{
if (allocated_count_)
--allocated_count_;
++deallocated_count_;
delete ptr;
ptr = nullptr;
}
}
};
template <typename Type>
class tracked_mgr
{
private:
tracked_allocator<Type> allocator_;
public:
explicit tracked_mgr() = default;
virtual ~tracked_mgr() = default;
tracked_mgr& operator=(const tracked_mgr&) = default;
tracked_mgr(const tracked_mgr&) = default;
public:
using pointer_type = Type*;
using type = Type;
const tracked_allocator<Type>& allocator() noexcept
{
return allocator_;
}
template <typename... Args>
pointer_type retain(Args&&... args)
{
pointer_type ptr = nullptr;
allocator_.retain(ptr, std::forward<Args>(args)...);
return ptr;
}
template <typename... Args>
[[maybe_unused]] pointer_type must_retain(Args&&... args)
{
try
{
return this->retain(std::forward<Args>(args)...);
}
catch (...)
{
std::terminate();
}
}
void dispose(pointer_type& ptr) noexcept
{
allocator_.dispose(ptr);
}
};
template <typename Type, typename Mgr = tracked_mgr<Type>>
class tracked_ptr
{
using manager = Mgr;
manager mgr_;
public:
template <typename... Args>
tracked_ptr(Args&&... args)
: ptr_(nullptr)
{
ptr_ = mgr_.retain(std::forward<Args>(args)...);
}
virtual ~tracked_ptr() noexcept
{
this->reset();
}
tracked_ptr(const tracked_ptr&) = delete;
tracked_ptr& operator=(const tracked_ptr&) = delete;
public:
using pointer_type = Type*;
using type = Type;
using reference_type = Type&;
using const_reference_type = const Type&;
using manager_type = tracked_mgr<manager>;
using pointer = pointer_type;
using reference = reference_type;
void reset()
{
if (ptr_)
{
mgr_.dispose(ptr_);
}
}
pointer_type get() const
{
return ptr_;
}
type& operator*() const
{
return *ptr_;
}
pointer_type operator->() const
{
return ptr_;
}
explicit operator bool() const
{
return ptr_ != nullptr;
}
void swap(tracked_ptr& other)
{
std::swap(ptr_, other.ptr_);
}
public:
tracked_ptr(tracked_ptr&& other) noexcept
: ptr_(other.ptr_)
{
other.ptr_ = nullptr;
}
tracked_ptr& operator=(tracked_ptr&& other) noexcept
{
if (this != &other)
{
ptr_ = other.ptr_;
other.ptr_ = nullptr;
}
return *this;
}
private:
pointer_type ptr_{nullptr};
};
template <typename Type>
inline auto make_tracked() -> tracked_ptr<Type>
{
return tracked_ptr<Type>();
}
template <typename RetType, typename... Type>
inline auto make_tracked(Type&&... arg) -> tracked_ptr<RetType>
{
return tracked_ptr<RetType>(std::forward<Type>(arg)...);
}
template <typename Type>
inline void swap(tracked_ptr<Type>& a, tracked_ptr<Type>& b)
{
a.swap(b);
}
namespace detail
{
using tracked_error = std::runtime_error;
inline void throw_tracked_error(const boost::source_location& loc = BOOST_CURRENT_LOCATION)
{
throw tracked_error(loc.to_string());
}
} // namespace detail
/// @brief This function is a standard way to verify a container' validity, inspired from NeKernel/VMKernel.
template <typename Type>
inline void try_throw(tracked_ptr<Type>& ptr)
{
if (ptr.manager().allocator().allocated_count_ < ptr.manager().allocator().deallocated_count_)
{
detail::throw_tracked_error();
}
}
} // namespace ocl
#endif // ifndef OCL_TRACKED_PTR
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