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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/FixedArray.h>
#include <AK/HashTable.h>
#include <AK/IntrusiveList.h>
#include <AK/RefCounted.h>
#include <AK/RefPtr.h>
#include <AK/Vector.h>
#include <AK/Weakable.h>
#include <Kernel/Forward.h>
#include <Kernel/Mutex.h>
namespace Kernel {
class VMObjectDeletedHandler {
public:
virtual ~VMObjectDeletedHandler() = default;
virtual void vmobject_deleted(VMObject&) = 0;
};
class VMObject : public RefCounted<VMObject>
, public Weakable<VMObject> {
friend class MemoryManager;
friend class Region;
public:
virtual ~VMObject();
virtual RefPtr<VMObject> try_clone() = 0;
virtual bool is_anonymous() const { return false; }
virtual bool is_inode() const { return false; }
virtual bool is_shared_inode() const { return false; }
virtual bool is_private_inode() const { return false; }
virtual bool is_contiguous() const { return false; }
size_t page_count() const { return m_physical_pages.size(); }
Span<RefPtr<PhysicalPage> const> physical_pages() const { return m_physical_pages.span(); }
Span<RefPtr<PhysicalPage>> physical_pages() { return m_physical_pages.span(); }
size_t size() const { return m_physical_pages.size() * PAGE_SIZE; }
virtual StringView class_name() const = 0;
ALWAYS_INLINE void ref_region() { m_regions_count++; }
ALWAYS_INLINE void unref_region() { m_regions_count--; }
ALWAYS_INLINE bool is_shared_by_multiple_regions() const { return m_regions_count > 1; }
void register_on_deleted_handler(VMObjectDeletedHandler& handler)
{
m_on_deleted.set(&handler);
}
void unregister_on_deleted_handler(VMObjectDeletedHandler& handler)
{
m_on_deleted.remove(&handler);
}
protected:
explicit VMObject(size_t);
explicit VMObject(const VMObject&);
template<typename Callback>
void for_each_region(Callback);
IntrusiveListNode<VMObject> m_list_node;
FixedArray<RefPtr<PhysicalPage>> m_physical_pages;
Mutex m_paging_lock { "VMObject" };
mutable SpinLock<u8> m_lock;
private:
VMObject& operator=(const VMObject&) = delete;
VMObject& operator=(VMObject&&) = delete;
VMObject(VMObject&&) = delete;
Atomic<u32, AK::MemoryOrder::memory_order_relaxed> m_regions_count { 0 };
HashTable<VMObjectDeletedHandler*> m_on_deleted;
SpinLock<u8> m_on_deleted_lock;
public:
using List = IntrusiveList<VMObject, RawPtr<VMObject>, &VMObject::m_list_node>;
};
}
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