mirror of
https://github.com/RGBCube/serenity
synced 2025-07-27 04:27:45 +00:00
LibCore: Make CObject reference-counted
Okay, I've spent a whole day on this now, and it finally kinda works!
With this patch, CObject and all of its derived classes are reference
counted instead of tree-owned.
The previous, Qt-like model was nice and familiar, but ultimately also
outdated and difficult to reason about.
CObject-derived types should now be stored in RefPtr/NonnullRefPtr and
each class can be constructed using the forwarding construct() helper:
auto widget = GWidget::construct(parent_widget);
Note that construct() simply forwards all arguments to an existing
constructor. It is inserted into each class by the C_OBJECT macro,
see CObject.h to understand how that works.
CObject::delete_later() disappears in this patch, as there is no longer
a single logical owner of a CObject.
This commit is contained in:
Andreas Kling
parent
0c72e0c09f
commit
bc319d9e88
45 changed files with 174 additions and 233 deletions
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@ -15,7 +15,6 @@ public:
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Timer,
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NotifierRead,
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NotifierWrite,
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DeferredDestroy,
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DeferredInvoke,
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ChildAdded,
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ChildRemoved,
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@ -43,7 +43,7 @@ public:
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int nread = m_socket->read((u8*)&length, sizeof(length));
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if (nread == 0) {
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dbg() << "RPC client disconnected";
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delete_later();
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shutdown();
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return;
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}
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ASSERT(nread == sizeof(length));
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@ -52,7 +52,7 @@ public:
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auto request_json = JsonValue::from_string(request);
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if (!request_json.is_object()) {
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dbg() << "RPC client sent invalid request";
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delete_later();
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shutdown();
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return;
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}
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@ -111,11 +111,17 @@ public:
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}
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if (type == "Disconnect") {
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delete_later();
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shutdown();
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return;
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}
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}
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void shutdown()
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{
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// FIXME: This is quite a hackish way to clean ourselves up.
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delete this;
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}
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private:
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ObjectPtr<CLocalSocket> m_socket;
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};
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@ -148,7 +154,8 @@ CEventLoop::CEventLoop()
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s_rpc_server->on_ready_to_accept = [&] {
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auto client_socket = s_rpc_server->accept();
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ASSERT(client_socket);
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new RPCClient(move(client_socket));
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// NOTE: RPCClient will delete itself in RPCClient::shutdown().
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(void)RPCClient::construct(move(client_socket)).leak_ref();
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};
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}
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@ -246,6 +253,7 @@ void CEventLoop::pump(WaitMode mode)
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#endif
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static_cast<CDeferredInvocationEvent&>(event).m_invokee(*receiver);
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} else {
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NonnullRefPtr<CObject> protector(*receiver);
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receiver->dispatch_event(event);
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}
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@ -23,13 +23,18 @@ CObject::CObject(CObject* parent, bool is_widget)
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CObject::~CObject()
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{
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// NOTE: We move our children out to a stack vector to prevent other
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// code from trying to iterate over them.
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auto children = move(m_children);
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// NOTE: We also unparent the children, so that they won't try to unparent
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// themselves in their own destructors.
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for (auto& child : children)
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child.m_parent = nullptr;
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all_objects().remove(*this);
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stop_timer();
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if (m_parent)
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m_parent->remove_child(*this);
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auto children_to_delete = move(m_children);
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for (auto* child : children_to_delete)
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delete child;
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}
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void CObject::event(CEvent& event)
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@ -37,9 +42,6 @@ void CObject::event(CEvent& event)
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switch (event.type()) {
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case CEvent::Timer:
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return timer_event(static_cast<CTimerEvent&>(event));
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case CEvent::DeferredDestroy:
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delete this;
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break;
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case CEvent::ChildAdded:
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case CEvent::ChildRemoved:
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return child_event(static_cast<CChildEvent&>(event));
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@ -58,19 +60,24 @@ void CObject::add_child(CObject& object)
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// FIXME: Should we support reparenting objects?
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ASSERT(!object.parent() || object.parent() == this);
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object.m_parent = this;
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m_children.append(&object);
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m_children.append(object);
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event(*make<CChildEvent>(CEvent::ChildAdded, object));
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}
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void CObject::remove_child(CObject& object)
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{
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for (ssize_t i = 0; i < m_children.size(); ++i) {
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if (m_children[i] == &object) {
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for (int i = 0; i < m_children.size(); ++i) {
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dbg() << i << "] " << m_children.at(i);
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if (m_children.ptr_at(i).ptr() == &object) {
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// NOTE: We protect the child so it survives the handling of ChildRemoved.
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NonnullRefPtr<CObject> protector = object;
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object.m_parent = nullptr;
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m_children.remove(i);
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event(*make<CChildEvent>(CEvent::ChildRemoved, object));
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return;
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}
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}
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ASSERT_NOT_REACHED();
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}
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void CObject::timer_event(CTimerEvent&)
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@ -104,11 +111,6 @@ void CObject::stop_timer()
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m_timer_id = 0;
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}
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void CObject::delete_later()
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{
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CEventLoop::current().post_event(*this, make<CEvent>(CEvent::DeferredDestroy));
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}
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void CObject::dump_tree(int indent)
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{
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for (int i = 0; i < indent; ++i) {
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@ -2,6 +2,8 @@
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#include <AK/Function.h>
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#include <AK/IntrusiveList.h>
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#include <AK/Noncopyable.h>
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#include <AK/NonnullRefPtrVector.h>
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#include <AK/StdLibExtras.h>
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#include <AK/String.h>
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#include <AK/Vector.h>
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@ -21,13 +23,18 @@ class CTimerEvent;
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public: \
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virtual const char* class_name() const override { return #klass; } \
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template<class... Args> \
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static inline ObjectPtr<klass> construct(Args&&... args) \
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static inline NonnullRefPtr<klass> construct(Args&&... args) \
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{ \
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return ObjectPtr<klass>(new klass(forward<Args>(args)...)); \
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return adopt(*new klass(forward<Args>(args)...)); \
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}
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class CObject : public Weakable<CObject> {
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class CObject
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: public RefCounted<CObject>
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, public Weakable<CObject> {
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// NOTE: No C_OBJECT macro for CObject itself.
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AK_MAKE_NONCOPYABLE(CObject)
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AK_MAKE_NONMOVABLE(CObject)
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public:
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IntrusiveListNode m_all_objects_list_node;
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@ -39,14 +46,14 @@ public:
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const String& name() const { return m_name; }
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void set_name(const StringView& name) { m_name = name; }
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Vector<CObject*>& children() { return m_children; }
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const Vector<CObject*>& children() const { return m_children; }
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NonnullRefPtrVector<CObject>& children() { return m_children; }
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const NonnullRefPtrVector<CObject>& children() const { return m_children; }
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template<typename Callback>
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void for_each_child(Callback callback)
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{
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for (auto* child : m_children) {
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if (callback(*child) == IterationDecision::Break)
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for (auto& child : m_children) {
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if (callback(child) == IterationDecision::Break)
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return;
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}
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}
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@ -66,8 +73,6 @@ public:
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void add_child(CObject&);
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void remove_child(CObject&);
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void delete_later();
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void dump_tree(int indent = 0);
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void deferred_invoke(Function<void(CObject&)>);
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@ -95,7 +100,7 @@ private:
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String m_name;
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int m_timer_id { 0 };
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bool m_widget { false };
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Vector<CObject*> m_children;
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NonnullRefPtrVector<CObject> m_children;
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};
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template<typename T>
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@ -49,22 +49,22 @@ namespace Server {
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};
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template<typename T, class... Args>
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T* new_connection_for_client(Args&&... args)
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NonnullRefPtr<T> new_connection_for_client(Args&&... args)
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{
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auto conn = new T(AK::forward<Args>(args)...) /* arghs */;
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auto conn = T::construct(forward<Args>(args)...);
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conn->send_greeting();
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return conn;
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}
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template<typename T, class... Args>
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T* new_connection_ng_for_client(Args&&... args)
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NonnullRefPtr<T> new_connection_ng_for_client(Args&&... args)
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{
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return new T(AK::forward<Args>(args)...) /* arghs */;
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return T::construct(forward<Args>(args)...) /* arghs */;
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}
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template<typename ServerMessage, typename ClientMessage>
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class Connection : public CObject {
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public:
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protected:
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Connection(CLocalSocket& socket, int client_id)
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: m_socket(socket)
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, m_client_id(client_id)
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@ -76,6 +76,7 @@ namespace Server {
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#endif
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}
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public:
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~Connection()
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{
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#if defined(CIPC_DEBUG)
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@ -108,14 +109,12 @@ namespace Server {
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switch (errno) {
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case EPIPE:
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dbgprintf("Connection::post_message: Disconnected from peer.\n");
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delete_later();
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shutdown();
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return;
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break;
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case EAGAIN:
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dbgprintf("Connection::post_message: Client buffer overflowed.\n");
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did_misbehave();
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return;
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break;
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default:
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perror("Connection::post_message writev");
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ASSERT_NOT_REACHED();
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@ -134,7 +133,6 @@ namespace Server {
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ssize_t nread = recv(m_socket->fd(), &message, sizeof(ClientMessage), MSG_DONTWAIT);
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if (nread == 0 || (nread == -1 && errno == EAGAIN)) {
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if (!messages_received) {
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// TODO: is delete_later() sufficient?
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CEventLoop::current().post_event(*this, make<DisconnectedEvent>(client_id()));
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}
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break;
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@ -171,8 +169,13 @@ namespace Server {
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void did_misbehave()
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{
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dbgprintf("Connection{%p} (id=%d, pid=%d) misbehaved, disconnecting.\n", this, client_id(), m_client_pid);
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shutdown();
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}
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void shutdown()
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{
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m_socket->close();
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delete_later();
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die();
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}
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int client_id() const { return m_client_id; }
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@ -182,13 +185,15 @@ namespace Server {
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// ### having this public is sad
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virtual void send_greeting() = 0;
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virtual void die() = 0;
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protected:
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void event(CEvent& event)
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{
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if (event.type() == Event::Disconnected) {
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int client_id = static_cast<const DisconnectedEvent&>(event).client_id();
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dbgprintf("Connection: Client disconnected: %d\n", client_id);
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delete this;
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die();
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return;
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}
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@ -228,13 +233,12 @@ namespace Server {
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switch (errno) {
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case EPIPE:
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dbg() << "Connection::post_message: Disconnected from peer";
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delete_later();
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shutdown();
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return;
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case EAGAIN:
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dbg() << "Connection::post_message: Client buffer overflowed.";
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did_misbehave();
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return;
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break;
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default:
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perror("Connection::post_message write");
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ASSERT_NOT_REACHED();
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@ -252,7 +256,6 @@ namespace Server {
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ssize_t nread = recv(m_socket->fd(), buffer, sizeof(buffer), MSG_DONTWAIT);
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if (nread == 0 || (nread == -1 && errno == EAGAIN)) {
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if (!messages_received) {
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// TODO: is delete_later() sufficient?
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CEventLoop::current().post_event(*this, make<DisconnectedEvent>(client_id()));
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}
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break;
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@ -278,21 +281,28 @@ namespace Server {
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void did_misbehave()
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{
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dbg() << "Connection{" << this << "} (id=" << m_client_id << ", pid=" << m_client_pid << ") misbehaved, disconnecting.";
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shutdown();
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}
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void shutdown()
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{
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m_socket->close();
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delete_later();
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die();
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}
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int client_id() const { return m_client_id; }
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pid_t client_pid() const { return m_client_pid; }
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void set_client_pid(pid_t pid) { m_client_pid = pid; }
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virtual void die() = 0;
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protected:
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void event(CEvent& event) override
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{
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if (event.type() == Event::Disconnected) {
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int client_id = static_cast<const DisconnectedEvent&>(event).client_id();
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dbgprintf("Connection: Client disconnected: %d\n", client_id);
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delete this;
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die();
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return;
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}
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@ -1,99 +1,3 @@
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#pragma once
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#include <AK/StdLibExtras.h>
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// This is a stopgap pointer. It's not meant to stick around forever.
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template<typename T>
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class ObjectPtr {
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public:
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ObjectPtr() {}
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ObjectPtr(T* ptr)
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: m_ptr(ptr)
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{
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}
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ObjectPtr(T& ptr)
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: m_ptr(&ptr)
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{
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}
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~ObjectPtr()
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{
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clear();
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}
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void clear()
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{
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if (m_ptr && !m_ptr->parent())
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delete m_ptr;
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m_ptr = nullptr;
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}
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ObjectPtr& operator=(std::nullptr_t)
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{
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clear();
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return *this;
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}
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template<typename U>
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ObjectPtr(U* ptr)
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: m_ptr(static_cast<T*>(ptr))
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{
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}
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ObjectPtr(const ObjectPtr& other)
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: m_ptr(other.m_ptr)
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{
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}
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template<typename U>
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ObjectPtr(const ObjectPtr<U>& other)
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: m_ptr(static_cast<T*>(const_cast<ObjectPtr<U>&>(other).ptr()))
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{
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}
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ObjectPtr(ObjectPtr&& other)
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{
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m_ptr = other.leak_ptr();
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}
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template<typename U>
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ObjectPtr(const ObjectPtr<U>&& other)
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{
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m_ptr = static_cast<T*>(const_cast<ObjectPtr<U>&>(other).leak_ptr());
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}
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ObjectPtr& operator=(const ObjectPtr& other)
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{
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if (this != &other) {
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clear();
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m_ptr = other.m_ptr;
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}
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return *this;
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}
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ObjectPtr& operator=(ObjectPtr&& other)
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{
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if (this != &other) {
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clear();
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m_ptr = exchange(other.m_ptr, nullptr);
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}
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return *this;
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}
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T* operator->() { return m_ptr; }
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const T* operator->() const { return m_ptr; }
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operator T*() { return m_ptr; }
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operator const T*() const { return m_ptr; }
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T& operator*() { return *m_ptr; }
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const T& operator*() const { return *m_ptr; }
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T* ptr() const { return m_ptr; }
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T* leak_ptr() { return exchange(m_ptr, nullptr); }
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operator bool() const { return !!m_ptr; }
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private:
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T* m_ptr { nullptr };
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};
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#define ObjectPtr RefPtr
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