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8c96f7b3aa
Inheriting from AtomicRefCounted and Weakable is asking for misuse of WeakPtr to result in TOCTOU-caused UAFs. In order to ensure we're not misusing EventReceiver across threads, I ran test-web and some sites with a temporary hack to verify that ref()s and unref()s are always called from the same thread on the class.
82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
/*
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* Copyright (c) 2018-2025, Andreas Kling <andreas@ladybird.org>
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* Copyright (c) 2022, the SerenityOS developers.
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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/AtomicRefCounted.h>
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#include <AK/Forward.h>
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#include <AK/Noncopyable.h>
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#include <AK/StringView.h>
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#include <AK/Weakable.h>
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#include <LibCore/Export.h>
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#include <LibCore/Forward.h>
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namespace Core {
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#define C_OBJECT(klass) \
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public: \
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virtual StringView class_name() const override \
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{ \
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return #klass##sv; \
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} \
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template<typename Klass = klass, class... Args> \
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static NonnullRefPtr<klass> construct(Args&&... args) \
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{ \
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return adopt_ref(*new Klass(::forward<Args>(args)...)); \
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}
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#define C_OBJECT_ABSTRACT(klass) \
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public: \
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virtual StringView class_name() const override \
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{ \
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return #klass##sv; \
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}
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class CORE_API EventReceiver
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: public RefCounted<EventReceiver>
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, public Weakable<EventReceiver> {
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// NOTE: No C_OBJECT macro for Core::EventReceiver itself.
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AK_MAKE_NONCOPYABLE(EventReceiver);
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AK_MAKE_NONMOVABLE(EventReceiver);
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public:
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virtual ~EventReceiver();
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virtual StringView class_name() const = 0;
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template<typename T>
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bool fast_is() const = delete;
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void start_timer(int ms);
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void stop_timer();
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bool has_timer() const { return m_timer_id; }
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void deferred_invoke(Function<void()>);
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void dispatch_event(Core::Event&);
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protected:
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EventReceiver();
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virtual void event(Core::Event&);
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virtual void timer_event(TimerEvent&);
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private:
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intptr_t m_timer_id { 0 };
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};
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}
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template<>
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struct AK::Formatter<Core::EventReceiver> : AK::Formatter<FormatString> {
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ErrorOr<void> format(FormatBuilder& builder, Core::EventReceiver const& value)
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{
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return AK::Formatter<FormatString>::format(builder, "{}({})"sv, value.class_name(), &value);
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}
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};
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