Signal viewer dock

core/object/object.cpp

@@ -42,6 +42,10 @@
 #include "core/string/translation_server.h"
 #include "core/variant/typed_array.h"
 
+// Static member initialization for signal emission callback
+std::atomic<Object::SignalEmissionCallback> Object::signal_emission_callback = nullptr;
+std::atomic<bool> Object::signal_emission_callback_enabled = false;
+
 #ifdef DEBUG_ENABLED
 
 struct _ObjectDebugLock {
@@ -1223,6 +1227,12 @@ Error Object::emit_signalp(const StringName &p_name, const Variant **p_args, int
 	uint32_t *slot_flags = slot_flags_stack;
 	uint32_t slot_count = 0;
 
+	// STEP 1: Signal emission hook - Declare variables for callback capture
+	// This allows editor tools like the Signal Viewer to track signal emissions globally
+	// We capture the callback while holding the lock, but call it after releasing to prevent deadlocks
+	Object::SignalEmissionCallback emission_callback = nullptr;
+	bool should_call_callback = false;
+
 	{
 		OBJ_SIGNAL_LOCK
 
@@ -1237,6 +1247,12 @@ Error Object::emit_signalp(const StringName &p_name, const Variant **p_args, int
 			return ERR_UNAVAILABLE;
 		}
 
+		// Capture callback state under lock (thread-safe atomic load)
+		should_call_callback = signal_emission_callback_enabled.load(std::memory_order_acquire) && signal_emission_callback.load(std::memory_order_acquire);
+		if (should_call_callback) {
+			emission_callback = signal_emission_callback.load(std::memory_order_acquire);
+		}
+
 		if (s->slot_map.size() > MAX_SLOTS_ON_STACK) {
 			slot_callables = (Callable *)memalloc(sizeof(Callable) * s->slot_map.size());
 			slot_flags = (uint32_t *)memalloc(sizeof(uint32_t) * s->slot_map.size());
@@ -1267,6 +1283,12 @@ Error Object::emit_signalp(const StringName &p_name, const Variant **p_args, int
 		}
 	}
 
+	// STEP 1: Call the emission callback outside the lock to prevent deadlocks
+	// if the callback re-enters signal code paths
+	if (should_call_callback && emission_callback) {
+		emission_callback(this, p_name, p_args, p_argcount);
+	}
+
 	OBJ_DEBUG_LOCK
 
 	// If this is a ref-counted object, prevent it from being destroyed during signal

core/object/object.h

@@ -791,6 +791,29 @@ class Object {
 public:
 	static constexpr bool _class_is_enabled = true;
 
+	// Signal tracking callback for editor tools (e.g., Signal Viewer)
+	// This callback is invoked whenever a signal is emitted, allowing tools to track signal activity
+	// The callback is only active when explicitly registered to minimize performance impact
+	typedef void (*SignalEmissionCallback)(Object *p_emitter, const StringName &p_signal, const Variant **p_args, int p_argcount);
+
+private:
+	static std::atomic<SignalEmissionCallback> signal_emission_callback;
+	static std::atomic<bool> signal_emission_callback_enabled;
+
+public:
+	static void set_signal_emission_callback(SignalEmissionCallback p_callback) {
+		signal_emission_callback.store(p_callback, std::memory_order_release);
+		signal_emission_callback_enabled.store(p_callback != nullptr, std::memory_order_release);
+	}
+
+	static SignalEmissionCallback get_signal_emission_callback() {
+		return signal_emission_callback.load(std::memory_order_acquire);
+	}
+
+	static bool is_signal_emission_callback_enabled() {
+		return signal_emission_callback_enabled.load(std::memory_order_acquire);
+	}
+
 	void notify_property_list_changed();
 
 	static void *get_class_ptr_static() {

doc/classes/SignalViewerRuntime.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="SignalViewerRuntime" inherits="Object" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+	<brief_description>
+	</brief_description>
+	<description>
+	</description>
+	<tutorials>
+	</tutorials>
+	<methods>
+		<method name="is_tracking_enabled" qualifiers="const">
+			<return type="bool" />
+			<description>
+			</description>
+		</method>
+		<method name="send_node_signal_data">
+			<return type="void" />
+			<param index="0" name="node_id" type="int" />
+			<description>
+			</description>
+		</method>
+		<method name="start_tracking">
+			<return type="void" />
+			<description>
+			</description>
+		</method>
+		<method name="stop_tracking">
+			<return type="void" />
+			<description>
+			</description>
+		</method>
+	</methods>
+</class>

editor/debugger/debug_adapter/debug_adapter_parser.cpp

@@ -514,7 +514,7 @@ Dictionary DebugAdapterParser::req_godot_put_msg(const Dictionary &p_params) con
 	String msg = args["message"];
 	Array data = args["data"];
 
-	EditorDebuggerNode::get_singleton()->get_default_debugger()->_put_msg(msg, data);
+	EditorDebuggerNode::get_singleton()->get_default_debugger()->put_msg(msg, data);
 
 	return prepare_success_response(p_params);
 }