mirror of
https://github.com/SerenityOS/serenity
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80 lines
1.7 KiB
C++
80 lines
1.7 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/Assertions.h>
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#include <AK/Types.h>
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#ifdef KERNEL
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# include <Kernel/Memory/VirtualAddress.h>
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#endif
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namespace AK {
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template<typename T>
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concept PointerTypeName = IsPointer<T>;
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template<PointerTypeName T>
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class Userspace {
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public:
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Userspace() = default;
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// Disable default implementations that would use surprising integer promotion.
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bool operator==(Userspace const&) const = delete;
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bool operator<=(Userspace const&) const = delete;
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bool operator>=(Userspace const&) const = delete;
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bool operator<(Userspace const&) const = delete;
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bool operator>(Userspace const&) const = delete;
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#ifdef KERNEL
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Userspace(FlatPtr ptr)
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: m_ptr(ptr)
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{
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}
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explicit operator bool() const { return m_ptr != 0; }
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FlatPtr ptr() const { return m_ptr; }
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VirtualAddress vaddr() const { return VirtualAddress(m_ptr); }
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T unsafe_userspace_ptr() const { return reinterpret_cast<T>(m_ptr); }
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#else
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Userspace(T ptr)
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: m_ptr(ptr)
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{
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}
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explicit operator bool() const { return m_ptr != nullptr; }
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T ptr() const { return m_ptr; }
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#endif
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private:
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#ifdef KERNEL
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FlatPtr m_ptr { 0 };
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#else
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T m_ptr { nullptr };
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#endif
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};
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template<typename T, typename U>
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inline Userspace<T> static_ptr_cast(Userspace<U> const& ptr)
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{
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#ifdef KERNEL
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auto casted_ptr = static_cast<T>(ptr.unsafe_userspace_ptr());
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#else
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auto casted_ptr = static_cast<T>(ptr.ptr());
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#endif
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return Userspace<T>(reinterpret_cast<FlatPtr>(casted_ptr));
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}
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}
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#if USING_AK_GLOBALLY
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using AK::static_ptr_cast;
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using AK::Userspace;
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#endif
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