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/*
* File: memory/tracked_ptr.hpp
* Purpose: Custom smart pointer implementation in C++
* Author: Amlal El Mahrouss (amlal@nekernel.org)
* Copyright 2025, Amlal El Mahrouss, licensed under the Boost Software License.
*/
#pragma once
#include <cstddef>
#include <utility>
#include <new>
#include <atomic>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
namespace ocl::memory
{
template <typename T>
class tracked_allocator;
template <typename T>
class tracked_mgr;
template <typename T, typename Mgr>
class tracked_ptr;
template <typename T>
class tracked_allocator
{
public:
std::atomic<size_t> allocated_count_ = 0;
std::atomic<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:
template <typename... U>
void retain(T*& ptr, U&&... args)
{
ptr = new T(std::forward<U>(args)...);
if (ptr)
{
++allocated_count_;
return;
}
throw std::bad_alloc();
}
template <typename... U>
void must_retain(T*& ptr, U&&... args) noexcept
{
this->retain(ptr, args...);
}
void dispose(T*& ptr) noexcept
{
if (ptr)
{
if (allocated_count_)
--allocated_count_;
++deallocated_count_;
delete ptr;
ptr = nullptr;
}
}
};
template <typename T>
class tracked_mgr
{
private:
tracked_allocator<T> allocator_;
public:
explicit tracked_mgr() = default;
virtual ~tracked_mgr() = default;
tracked_mgr& operator=(const tracked_mgr&) = default;
tracked_mgr(const tracked_mgr&) = default;
public:
const tracked_allocator<T>& allocator() noexcept
{
return allocator_;
}
template <typename... U>
T* retain(U&&... args)
{
T* ptr = nullptr;
allocator_.retain(ptr, std::forward<U>(args)...);
return ptr;
}
template <typename... U>
T* must_retain(U&&... args) noexcept
{
return this->retain(std::forward<U>(args)...);
}
void dispose(T*& ptr) noexcept
{
allocator_.dispose(ptr);
}
};
template <typename T, typename Mgr = tracked_mgr<T>>
class tracked_ptr
{
public:
static Mgr& manager() noexcept
{
static Mgr mgr;
return mgr;
}
public:
template <typename... U>
tracked_ptr(U&&... args)
: ptr_(nullptr)
{
ptr_ = tracked_ptr::manager().retain(std::forward<U>(args)...);
}
virtual ~tracked_ptr() noexcept
{
this->reset();
}
tracked_ptr(const tracked_ptr&) = delete;
tracked_ptr& operator=(const tracked_ptr&) = delete;
public:
void reset()
{
if (ptr_)
{
tracked_ptr::manager().dispose(ptr_);
}
}
T* get() const
{
return ptr_;
}
T* data()
{
return ptr_;
}
T& operator*() const
{
return *ptr_;
}
T* 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)
{
this->reset();
ptr_ = other.ptr_;
other.ptr_ = nullptr;
}
return *this;
}
private:
T* ptr_{nullptr};
};
template <typename T>
inline auto make_tracked() -> tracked_ptr<T>
{
return tracked_ptr<T>();
}
template <typename U, typename... T>
inline auto make_tracked(T&&... arg) -> tracked_ptr<U>
{
return tracked_ptr<U>(std::forward<T>(arg)...);
}
template <typename T>
inline void swap(tracked_ptr<T>& a, tracked_ptr<T>& b)
{
a.swap(b);
}
/// @brief a Must Pass function is a standard way to verify a container' validity, inspired from NeKernel/VMKernel.
template <typename T, typename error_handler>
inline void must_pass(tracked_ptr<T>& ptr, error_handler handler)
{
if (ptr.manager().allocator().allocated_count_ < ptr.manager().allocator().deallocated_count_)
{
handler.template error<true>("Invalid TrackedPtr detected: Deallocated count exceeds allocated count.");
}
}
} // namespace ocl::memory
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