mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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250 lines
10 KiB
C++
250 lines
10 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <mesosphere/kern_common.hpp>
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#include <mesosphere/kern_k_typed_address.hpp>
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#include <mesosphere/kern_k_class_token.hpp>
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namespace ams::kern {
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class KProcess;
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#define MESOSPHERE_AUTOOBJECT_TRAITS(CLASS, BASE_CLASS) \
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NON_COPYABLE(CLASS); \
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NON_MOVEABLE(CLASS); \
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private: \
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friend class ::ams::kern::KClassTokenGenerator; \
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static constexpr inline auto ObjectType = ::ams::kern::KClassTokenGenerator::ObjectType::CLASS; \
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static constexpr inline const char * const TypeName = #CLASS; \
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static constexpr inline ClassTokenType ClassToken() { return ::ams::kern::ClassToken<CLASS>; } \
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public: \
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using BaseClass = BASE_CLASS; \
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static constexpr ALWAYS_INLINE TypeObj GetStaticTypeObj() { \
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constexpr ClassTokenType Token = ClassToken(); \
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return TypeObj(TypeName, Token); \
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} \
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static constexpr ALWAYS_INLINE const char *GetStaticTypeName() { return TypeName; } \
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virtual TypeObj GetTypeObj() const { return GetStaticTypeObj(); } \
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virtual const char *GetTypeName() { return GetStaticTypeName(); } \
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private:
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class KAutoObject {
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protected:
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class TypeObj {
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private:
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const char *m_name;
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ClassTokenType m_class_token;
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public:
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constexpr explicit TypeObj(const char *n, ClassTokenType tok) : m_name(n), m_class_token(tok) { /* ... */ }
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constexpr ALWAYS_INLINE const char *GetName() const { return m_name; }
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constexpr ALWAYS_INLINE ClassTokenType GetClassToken() const { return m_class_token; }
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constexpr ALWAYS_INLINE bool operator==(const TypeObj &rhs) {
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return this->GetClassToken() == rhs.GetClassToken();
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}
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constexpr ALWAYS_INLINE bool operator!=(const TypeObj &rhs) {
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return this->GetClassToken() != rhs.GetClassToken();
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}
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constexpr ALWAYS_INLINE bool IsDerivedFrom(const TypeObj &rhs) {
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return (this->GetClassToken() | rhs.GetClassToken()) == this->GetClassToken();
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}
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};
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private:
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MESOSPHERE_AUTOOBJECT_TRAITS(KAutoObject, KAutoObject);
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private:
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std::atomic<u32> m_ref_count;
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public:
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static KAutoObject *Create(KAutoObject *ptr);
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public:
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constexpr ALWAYS_INLINE explicit KAutoObject() : m_ref_count(0) { MESOSPHERE_ASSERT_THIS(); }
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virtual ~KAutoObject() { MESOSPHERE_ASSERT_THIS(); }
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/* Destroy is responsible for destroying the auto object's resources when ref_count hits zero. */
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virtual void Destroy() { MESOSPHERE_ASSERT_THIS(); }
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/* Finalize is responsible for cleaning up resource, but does not destroy the object. */
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virtual void Finalize() { MESOSPHERE_ASSERT_THIS(); }
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virtual KProcess *GetOwner() const { return nullptr; }
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u32 GetReferenceCount() const {
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return m_ref_count.load();
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}
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ALWAYS_INLINE bool IsDerivedFrom(const TypeObj &rhs) const {
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return this->GetTypeObj().IsDerivedFrom(rhs);
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}
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ALWAYS_INLINE bool IsDerivedFrom(const KAutoObject &rhs) const {
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return this->IsDerivedFrom(rhs.GetTypeObj());
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}
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template<typename Derived>
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ALWAYS_INLINE Derived DynamicCast() {
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static_assert(std::is_pointer<Derived>::value);
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using DerivedType = typename std::remove_pointer<Derived>::type;
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if (AMS_LIKELY(this->IsDerivedFrom(DerivedType::GetStaticTypeObj()))) {
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return static_cast<Derived>(this);
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} else {
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return nullptr;
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}
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}
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template<typename Derived>
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ALWAYS_INLINE const Derived DynamicCast() const {
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static_assert(std::is_pointer<Derived>::value);
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using DerivedType = typename std::remove_pointer<Derived>::type;
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if (AMS_LIKELY(this->IsDerivedFrom(DerivedType::GetStaticTypeObj()))) {
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return static_cast<Derived>(this);
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} else {
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return nullptr;
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}
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}
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ALWAYS_INLINE bool Open() {
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MESOSPHERE_ASSERT_THIS();
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/* Atomically increment the reference count, only if it's positive. */
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u32 cur_ref_count = m_ref_count.load(std::memory_order_acquire);
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do {
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if (AMS_UNLIKELY(cur_ref_count == 0)) {
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MESOSPHERE_AUDIT(cur_ref_count != 0);
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return false;
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}
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MESOSPHERE_ABORT_UNLESS(cur_ref_count < cur_ref_count + 1);
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} while (!m_ref_count.compare_exchange_weak(cur_ref_count, cur_ref_count + 1, std::memory_order_relaxed));
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return true;
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}
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ALWAYS_INLINE void Close() {
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MESOSPHERE_ASSERT_THIS();
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/* Atomically decrement the reference count, not allowing it to become negative. */
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u32 cur_ref_count = m_ref_count.load(std::memory_order_acquire);
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do {
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MESOSPHERE_ABORT_UNLESS(cur_ref_count > 0);
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} while (!m_ref_count.compare_exchange_weak(cur_ref_count, cur_ref_count - 1, std::memory_order_relaxed));
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/* If ref count hits zero, destroy the object. */
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if (cur_ref_count - 1 == 0) {
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this->Destroy();
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}
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}
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};
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class KAutoObjectWithListContainer;
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class KAutoObjectWithList : public KAutoObject {
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private:
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friend class KAutoObjectWithListContainer;
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private:
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util::IntrusiveRedBlackTreeNode list_node;
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public:
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static ALWAYS_INLINE int Compare(const KAutoObjectWithList &lhs, const KAutoObjectWithList &rhs) {
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const u64 lid = lhs.GetId();
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const u64 rid = rhs.GetId();
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if (lid < rid) {
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return -1;
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} else if (lid > rid) {
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return 1;
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} else {
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return 0;
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}
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}
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public:
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virtual u64 GetId() const {
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return reinterpret_cast<u64>(this);
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}
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};
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template<typename T> requires std::derived_from<T, KAutoObject>
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class KScopedAutoObject {
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NON_COPYABLE(KScopedAutoObject);
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private:
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template<typename U>
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friend class KScopedAutoObject;
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private:
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T *m_obj;
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private:
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constexpr ALWAYS_INLINE void Swap(KScopedAutoObject &rhs) {
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std::swap(m_obj, rhs.m_obj);
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}
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public:
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constexpr ALWAYS_INLINE KScopedAutoObject() : m_obj(nullptr) { /* ... */ }
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constexpr ALWAYS_INLINE KScopedAutoObject(T *o) : m_obj(o) {
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if (m_obj != nullptr) {
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m_obj->Open();
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}
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}
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~KScopedAutoObject() {
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if (m_obj != nullptr) {
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m_obj->Close();
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}
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m_obj = nullptr;
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}
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template<typename U> requires (std::derived_from<T, U> || std::derived_from<U, T>)
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constexpr KScopedAutoObject(KScopedAutoObject<U> &&rhs) {
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if constexpr (std::derived_from<U, T>) {
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/* Upcast. */
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m_obj = rhs.m_obj;
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rhs.m_obj = nullptr;
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} else {
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/* Downcast. */
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T *derived = nullptr;
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if (rhs.m_obj != nullptr) {
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derived = rhs.m_obj->template DynamicCast<T *>();
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if (derived == nullptr) {
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rhs.m_obj->Close();
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}
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}
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m_obj = derived;
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rhs.m_obj = nullptr;
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}
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}
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constexpr ALWAYS_INLINE KScopedAutoObject<T> &operator=(KScopedAutoObject<T> &&rhs) {
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rhs.Swap(*this);
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return *this;
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}
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constexpr ALWAYS_INLINE T *operator->() { return m_obj; }
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constexpr ALWAYS_INLINE T &operator*() { return *m_obj; }
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constexpr ALWAYS_INLINE void Reset(T *o) {
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KScopedAutoObject(o).Swap(*this);
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}
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constexpr ALWAYS_INLINE T *GetPointerUnsafe() { return m_obj; }
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constexpr ALWAYS_INLINE T *ReleasePointerUnsafe() { T *ret = m_obj; m_obj = nullptr; return ret; }
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constexpr ALWAYS_INLINE bool IsNull() const { return m_obj == nullptr; }
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constexpr ALWAYS_INLINE bool IsNotNull() const { return m_obj != nullptr; }
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};
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}
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