Support threads in the script debugger

* This implementation adds threads on the side of the client (script debugger).
* Some functions of the debugger are optimized.
* The profile is also now thread safe using atomics.
* The editor can switch between multiple threads when debugging.

This PR adds threaded support for the script language debugger. Every thread has its own thread local data and it will connect to the debugger using multiple thread IDs.
This means that, now, the editor can receive multiple threads entering debug mode at the same time.

1 files changed, 30 insertions, 7 deletions

diff --git a/editor/debugger/script_editor_debugger.h b/editor/debugger/script_editor_debugger.h
index 336a113163..7e9a767273 100644
--- a/editor/debugger/script_editor_debugger.h
+++ b/editor/debugger/script_editor_debugger.h
@@ -138,6 +138,7 @@ private:
 
 	Tree *stack_dump = nullptr;
 	LineEdit *search = nullptr;
+	OptionButton *threads = nullptr;
 	EditorDebuggerInspector *inspector = nullptr;
 	SceneDebuggerTree *scene_tree = nullptr;
 
@@ -152,19 +153,39 @@ private:
 	EditorPerformanceProfiler *performance_profiler = nullptr;
 
 	OS::ProcessID remote_pid = 0;
-	bool breaked = false;
-	bool can_debug = false;
 	bool move_to_foreground = true;
 	bool can_request_idle_draw = false;
 
 	bool live_debug;
 
+	uint64_t debugging_thread_id = Thread::UNASSIGNED_ID;
+
+	struct ThreadDebugged {
+		String name;
+		String error;
+		bool can_debug = false;
+		bool has_stackdump = false;
+		uint32_t debug_order = 0;
+		uint64_t thread_id = Thread::UNASSIGNED_ID; // for order
+	};
+
+	struct ThreadSort {
+		bool operator()(const ThreadDebugged *a, const ThreadDebugged *b) const {
+			return a->debug_order < b->debug_order;
+		}
+	};
+
+	HashMap<uint64_t, ThreadDebugged> threads_debugged;
+	bool thread_list_updating = false;
+
+	void _select_thread(int p_index);
+
 	EditorDebuggerNode::CameraOverride camera_override;
 
 	void _stack_dump_frame_selected();
 
 	void _file_selected(const String &p_file);
-	void _parse_message(const String &p_msg, const Array &p_data);
+	void _parse_message(const String &p_msg, uint64_t p_thread_id, const Array &p_data);
 	void _set_reason_text(const String &p_reason, MessageType p_type);
 	void _update_buttons_state();
 	void _remote_object_selected(ObjectID p_object);
@@ -200,7 +221,7 @@ private:
 	void _item_menu_id_pressed(int p_option);
 	void _tab_changed(int p_tab);
 
-	void _put_msg(String p_message, Array p_data);
+	void _put_msg(String p_message, Array p_data, uint64_t p_thread_id = Thread::MAIN_ID);
 	void _export_csv();
 
 	void _clear_execution();
@@ -213,6 +234,8 @@ private:
 
 	String _format_frame_text(const ScriptLanguage::StackInfo *info);
 
+	void _thread_debug_enter(uint64_t p_thread_id);
+
 protected:
 	void _notification(int p_what);
 	static void _bind_methods();
@@ -238,9 +261,9 @@ public:
 	void debug_step();
 	void debug_break();
 	void debug_continue();
-	bool is_breaked() const { return breaked; }
-	bool is_debuggable() const { return can_debug; }
-	bool is_session_active() { return peer.is_valid() && peer->is_peer_connected(); };
+	bool is_breaked() const { return threads_debugged.size() > 0; }
+	bool is_debuggable() const { return threads_debugged.size() > 0 && threads_debugged[debugging_thread_id].can_debug; }
+	bool is_session_active() { return peer.is_valid() && peer->is_peer_connected(); }
 	int get_remote_pid() const { return remote_pid; }
 
 	bool is_move_to_foreground() const;