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0d963fd641
VMObject already has an IntrusiveList of all the Regions that map it. We were keeping a counter in addition to this, and only using it in a single place to avoid iterating over the list in case it only had 1 entry. Simplify VMObject by removing this counter and always iterating the list even if there's only 1 entry. :^)
123 lines
3.2 KiB
C++
123 lines
3.2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/FixedArray.h>
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#include <AK/HashTable.h>
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#include <AK/IntrusiveList.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <AK/Vector.h>
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#include <AK/Weakable.h>
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#include <Kernel/Forward.h>
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#include <Kernel/Mutex.h>
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#include <Kernel/VM/Region.h>
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namespace Kernel {
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class VMObjectDeletedHandler {
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public:
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virtual ~VMObjectDeletedHandler() = default;
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virtual void vmobject_deleted(VMObject&) = 0;
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};
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class VMObject : public RefCounted<VMObject>
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, public Weakable<VMObject> {
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friend class MemoryManager;
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friend class Region;
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public:
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virtual ~VMObject();
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virtual RefPtr<VMObject> try_clone() = 0;
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virtual bool is_anonymous() const { return false; }
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virtual bool is_inode() const { return false; }
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virtual bool is_shared_inode() const { return false; }
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virtual bool is_private_inode() const { return false; }
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virtual bool is_contiguous() const { return false; }
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size_t page_count() const { return m_physical_pages.size(); }
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Span<RefPtr<PhysicalPage> const> physical_pages() const { return m_physical_pages.span(); }
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Span<RefPtr<PhysicalPage>> physical_pages() { return m_physical_pages.span(); }
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size_t size() const { return m_physical_pages.size() * PAGE_SIZE; }
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virtual StringView class_name() const = 0;
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ALWAYS_INLINE void add_region(Region& region)
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{
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ScopedSpinLock locker(m_lock);
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m_regions.append(region);
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}
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ALWAYS_INLINE void remove_region(Region& region)
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{
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ScopedSpinLock locker(m_lock);
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m_regions.remove(region);
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}
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void register_on_deleted_handler(VMObjectDeletedHandler& handler)
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{
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ScopedSpinLock locker(m_on_deleted_lock);
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m_on_deleted.set(&handler);
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}
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void unregister_on_deleted_handler(VMObjectDeletedHandler& handler)
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{
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ScopedSpinLock locker(m_on_deleted_lock);
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m_on_deleted.remove(&handler);
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}
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protected:
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explicit VMObject(size_t);
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explicit VMObject(VMObject const&);
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template<typename Callback>
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void for_each_region(Callback);
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IntrusiveListNode<VMObject> m_list_node;
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FixedArray<RefPtr<PhysicalPage>> m_physical_pages;
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mutable RecursiveSpinLock m_lock;
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private:
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VMObject& operator=(VMObject const&) = delete;
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VMObject& operator=(VMObject&&) = delete;
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VMObject(VMObject&&) = delete;
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HashTable<VMObjectDeletedHandler*> m_on_deleted;
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SpinLock<u8> m_on_deleted_lock;
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Region::ListInVMObject m_regions;
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public:
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using List = IntrusiveList<VMObject, RawPtr<VMObject>, &VMObject::m_list_node>;
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};
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template<typename Callback>
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inline void VMObject::for_each_region(Callback callback)
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{
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ScopedSpinLock lock(m_lock);
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for (auto& region : m_regions) {
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callback(region);
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}
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}
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inline PhysicalPage const* Region::physical_page(size_t index) const
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{
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VERIFY(index < page_count());
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return vmobject().physical_pages()[first_page_index() + index];
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}
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inline RefPtr<PhysicalPage>& Region::physical_page_slot(size_t index)
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{
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VERIFY(index < page_count());
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return vmobject().physical_pages()[first_page_index() + index];
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}
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}
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