object.cpp

/**************************************************************************/
/*  object.cpp                                                            */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
/*                                                                        */
/* Permission is hereby granted, free of charge, to any person obtaining  */
/* a copy of this software and associated documentation files (the        */
/* "Software"), to deal in the Software without restriction, including    */
/* without limitation the rights to use, copy, modify, merge, publish,    */
/* distribute, sublicense, and/or sell copies of the Software, and to     */
/* permit persons to whom the Software is furnished to do so, subject to  */
/* the following conditions:                                              */
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/* The above copyright notice and this permission notice shall be         */
/* included in all copies or substantial portions of the Software.        */
/*                                                                        */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
/**************************************************************************/

#include "object.h"

#include "core/extension/gdextension_manager.h"
#include "core/io/resource.h"
#include "core/object/class_db.h"
#include "core/object/message_queue.h"
#include "core/object/script_language.h"
#include "core/os/os.h"
#include "core/string/print_string.h"
#include "core/string/translation_server.h"
#include "core/variant/typed_array.h"

#ifdef DEBUG_ENABLED

struct _ObjectDebugLock {
	ObjectID obj_id;

	_ObjectDebugLock(Object *p_obj) {
		obj_id = p_obj->get_instance_id();
		p_obj->_lock_index.ref();
	}
	~_ObjectDebugLock() {
		Object *obj_ptr = ObjectDB::get_instance(obj_id);
		if (likely(obj_ptr)) {
			obj_ptr->_lock_index.unref();
		}
	}
};

#define OBJ_DEBUG_LOCK _ObjectDebugLock _debug_lock(this);

#else

#define OBJ_DEBUG_LOCK

#endif

struct _ObjectSignalLock {
	Mutex *mutex;
	_ObjectSignalLock(const Object *const p_obj) {
		mutex = p_obj->signal_mutex;
		if (mutex) {
			mutex->lock();
		}
	}
	~_ObjectSignalLock() {
		if (mutex) {
			mutex->unlock();
		}
	}
};

#define OBJ_SIGNAL_LOCK _ObjectSignalLock _signal_lock(this);

PropertyInfo::operator Dictionary() const {
	Dictionary d;
	d["name"] = name;
	d["class_name"] = class_name;
	d["type"] = type;
	d["hint"] = hint;
	d["hint_string"] = hint_string;
	d["usage"] = usage;
	return d;
}

PropertyInfo PropertyInfo::from_dict(const Dictionary &p_dict) {
	PropertyInfo pi;

	if (p_dict.has("type")) {
		pi.type = Variant::Type(int(p_dict["type"]));
	}

	if (p_dict.has("name")) {
		pi.name = p_dict["name"];
	}

	if (p_dict.has("class_name")) {
		pi.class_name = p_dict["class_name"];
	}

	if (p_dict.has("hint")) {
		pi.hint = PropertyHint(int(p_dict["hint"]));
	}

	if (p_dict.has("hint_string")) {
		pi.hint_string = p_dict["hint_string"];
	}

	if (p_dict.has("usage")) {
		pi.usage = p_dict["usage"];
	}

	return pi;
}

TypedArray<Dictionary> convert_property_list(const List<PropertyInfo> *p_list) {
	TypedArray<Dictionary> va;
	for (const List<PropertyInfo>::Element *E = p_list->front(); E; E = E->next()) {
		va.push_back(Dictionary(E->get()));
	}

	return va;
}

TypedArray<Dictionary> convert_property_list(const Vector<PropertyInfo> &p_vector) {
	TypedArray<Dictionary> va;
	for (const PropertyInfo &E : p_vector) {
		va.push_back(Dictionary(E));
	}

	return va;
}

MethodInfo::operator Dictionary() const {
	Dictionary d;
	d["name"] = name;
	d["args"] = convert_property_list(arguments);
	Array da;
	for (int i = 0; i < default_arguments.size(); i++) {
		da.push_back(default_arguments[i]);
	}
	d["default_args"] = da;
	d["flags"] = flags;
	d["id"] = id;
	Dictionary r = return_val;
	d["return"] = r;
	return d;
}

MethodInfo MethodInfo::from_dict(const Dictionary &p_dict) {
	MethodInfo mi;

	if (p_dict.has("name")) {
		mi.name = p_dict["name"];
	}
	Array args;
	if (p_dict.has("args")) {
		args = p_dict["args"];
	}

	for (const Variant &arg : args) {
		Dictionary d = arg;
		mi.arguments.push_back(PropertyInfo::from_dict(d));
	}
	Array defargs;
	if (p_dict.has("default_args")) {
		defargs = p_dict["default_args"];
	}
	for (const Variant &defarg : defargs) {
		mi.default_arguments.push_back(defarg);
	}

	if (p_dict.has("return")) {
		mi.return_val = PropertyInfo::from_dict(p_dict["return"]);
	}

	if (p_dict.has("flags")) {
		mi.flags = p_dict["flags"];
	}

	return mi;
}

uint32_t MethodInfo::get_compatibility_hash() const {
	bool has_return = (return_val.type != Variant::NIL) || (return_val.usage & PROPERTY_USAGE_NIL_IS_VARIANT);

	uint32_t hash = hash_murmur3_one_32(has_return);
	hash = hash_murmur3_one_32(arguments.size(), hash);

	if (has_return) {
		hash = hash_murmur3_one_32(return_val.type, hash);
		if (return_val.class_name != StringName()) {
			hash = hash_murmur3_one_32(return_val.class_name.hash(), hash);
		}
	}

	for (const PropertyInfo &arg : arguments) {
		hash = hash_murmur3_one_32(arg.type, hash);
		if (arg.class_name != StringName()) {
			hash = hash_murmur3_one_32(arg.class_name.hash(), hash);
		}
	}

	hash = hash_murmur3_one_32(default_arguments.size(), hash);
	for (const Variant &v : default_arguments) {
		hash = hash_murmur3_one_32(v.hash(), hash);
	}

	hash = hash_murmur3_one_32(flags & METHOD_FLAG_CONST ? 1 : 0, hash);
	hash = hash_murmur3_one_32(flags & METHOD_FLAG_VARARG ? 1 : 0, hash);

	return hash_fmix32(hash);
}

Object::Connection::operator Variant() const {
	Dictionary d;
	d["signal"] = signal;
	d["callable"] = callable;
	d["flags"] = flags;
	return d;
}

void ObjectGDExtension::create_gdtype() {
	ERR_FAIL_COND(gdtype);

	gdtype = memnew(GDType(ClassDB::get_gdtype(parent_class_name), class_name));
}

void ObjectGDExtension::destroy_gdtype() {
	ERR_FAIL_COND(!gdtype);

	memdelete(const_cast<GDType *>(gdtype));
	gdtype = nullptr;
}

ObjectGDExtension::~ObjectGDExtension() {
	if (gdtype) {
		memdelete(const_cast<GDType *>(gdtype));
	}
}

bool Object::Connection::operator<(const Connection &p_conn) const {
	if (signal == p_conn.signal) {
		return callable < p_conn.callable;
	} else {
		return signal < p_conn.signal;
	}
}

Object::Connection::Connection(const Variant &p_variant) {
	Dictionary d = p_variant;
	if (d.has("signal")) {
		signal = d["signal"];
	}
	if (d.has("callable")) {
		callable = d["callable"];
	}
	if (d.has("flags")) {
		flags = d["flags"];
	}
}

bool Object::_predelete() {
	_predelete_ok = true;
	notification(NOTIFICATION_PREDELETE, true);
	if (!_predelete_ok) {
		return false;
	}

	_gdtype_ptr = nullptr; // Must restore, so constructors/destructors have proper class name access at each stage.
	notification(NOTIFICATION_PREDELETE_CLEANUP, true);

	// Destruction order starts with the most derived class, and progresses towards the base Object class:
	// Script subclasses -> GDExtension subclasses -> C++ subclasses -> Object
	if (script_instance) {
		memdelete(script_instance);
	}
	script_instance = nullptr;

	if (_extension) {
#ifdef TOOLS_ENABLED
		if (_extension->untrack_instance) {
			_extension->untrack_instance(_extension->tracking_userdata, this);
		}
#endif
		if (_extension->free_instance) {
			_extension->free_instance(_extension->class_userdata, _extension_instance);
		}
		_extension = nullptr;
		_extension_instance = nullptr;
		// _gdtype_ptr = nullptr; // The pointer already set to nullptr above, no need to do it again.
	}
#ifdef TOOLS_ENABLED
	else if (_instance_bindings != nullptr) {
		Engine *engine = Engine::get_singleton();
		GDExtensionManager *gdextension_manager = GDExtensionManager::get_singleton();
		if (engine && gdextension_manager && engine->is_extension_reloading_enabled()) {
			for (uint32_t i = 0; i < _instance_binding_count; i++) {
				gdextension_manager->untrack_instance_binding(_instance_bindings[i].token, this);
			}
		}
	}
#endif

	return true;
}

void Object::cancel_free() {
	_predelete_ok = false;
}

void Object::_initialize() {
	// Cache the class name in the object for quick reference.
	_gdtype_ptr = &_get_typev();
	_initialize_classv();
}

void Object::_postinitialize() {
	if (_uses_signal_mutex()) {
		signal_mutex = memnew(Mutex);
	}
	notification(NOTIFICATION_POSTINITIALIZE);
}

void Object::set(const StringName &p_name, const Variant &p_value, bool *r_valid) {
#ifdef TOOLS_ENABLED

	_edited = true;
#endif

	if (script_instance) {
		if (script_instance->set(p_name, p_value)) {
			if (r_valid) {
				*r_valid = true;
			}
			return;
		}
	}

	if (_extension && _extension->set) {
		if (_extension->set(_extension_instance, (GDExtensionConstStringNamePtr)&p_name, (GDExtensionConstVariantPtr)&p_value)) {
			if (r_valid) {
				*r_valid = true;
			}
			return;
		}
	}

	// Try built-in setter.
	{
		if (ClassDB::set_property(this, p_name, p_value, r_valid)) {
			return;
		}
	}

	if (p_name == CoreStringName(script)) {
		set_script(p_value);
		if (r_valid) {
			*r_valid = true;
		}
		return;

	} else {
		Variant **V = metadata_properties.getptr(p_name);
		if (V) {
			**V = p_value;
			if (r_valid) {
				*r_valid = true;
			}
			return;
		} else if (p_name.operator String().begins_with("metadata/")) {
			// Must exist, otherwise duplicate() will not work.
			set_meta(p_name.operator String().replace_first("metadata/", ""), p_value);
			if (r_valid) {
				*r_valid = true;
			}
			return;
		}
	}

#ifdef TOOLS_ENABLED
	if (script_instance) {
		bool valid;
		script_instance->property_set_fallback(p_name, p_value, &valid);
		if (valid) {
			if (r_valid) {
				*r_valid = true;
			}
			return;
		}
	}
#endif

	// Something inside the object... :|
	bool success = _setv(p_name, p_value);
	if (success) {
		if (r_valid) {
			*r_valid = true;
		}
		return;
	}

	if (r_valid) {
		*r_valid = false;
	}
}

Variant Object::get(const StringName &p_name, bool *r_valid) const {
	Variant ret;

	if (script_instance) {
		if (script_instance->get(p_name, ret)) {
			if (r_valid) {
				*r_valid = true;
			}
			return ret;
		}
	}
	if (_extension && _extension->get) {
		if (_extension->get(_extension_instance, (GDExtensionConstStringNamePtr)&p_name, (GDExtensionVariantPtr)&ret)) {
			if (r_valid) {
				*r_valid = true;
			}
			return ret;
		}
	}

	// Try built-in getter.
	{
		if (ClassDB::get_property(const_cast<Object *>(this), p_name, ret)) {
			if (r_valid) {
				*r_valid = true;
			}
			return ret;
		}
	}

	if (p_name == CoreStringName(script)) {
		ret = get_script();
		if (r_valid) {
			*r_valid = true;
		}
		return ret;
	}

	const Variant *const *V = metadata_properties.getptr(p_name);

	if (V) {
		ret = **V;
		if (r_valid) {
			*r_valid = true;
		}
		return ret;

	} else {
#ifdef TOOLS_ENABLED
		if (script_instance) {
			bool valid;
			ret = script_instance->property_get_fallback(p_name, &valid);
			if (valid) {
				if (r_valid) {
					*r_valid = true;
				}
				return ret;
			}
		}
#endif
		// Something inside the object... :|
		bool success = _getv(p_name, ret);
		if (success) {
			if (r_valid) {
				*r_valid = true;
			}
			return ret;
		}

		if (r_valid) {
			*r_valid = false;
		}
		return Variant();
	}
}

void Object::set_indexed(const Vector<StringName> &p_names, const Variant &p_value, bool *r_valid) {
	if (p_names.is_empty()) {
		if (r_valid) {
			*r_valid = false;
		}
		return;
	}
	if (p_names.size() == 1) {
		set(p_names[0], p_value, r_valid);
		return;
	}

	bool valid = false;
	if (!r_valid) {
		r_valid = &valid;
	}

	List<Variant> value_stack;

	value_stack.push_back(get(p_names[0], r_valid));

	if (!*r_valid) {
		value_stack.clear();
		return;
	}

	for (int i = 1; i < p_names.size() - 1; i++) {
		value_stack.push_back(value_stack.back()->get().get_named(p_names[i], valid));
		if (r_valid) {
			*r_valid = valid;
		}

		if (!valid) {
			value_stack.clear();
			return;
		}
	}

	value_stack.push_back(p_value); // p_names[p_names.size() - 1]

	for (int i = p_names.size() - 1; i > 0; i--) {
		value_stack.back()->prev()->get().set_named(p_names[i], value_stack.back()->get(), valid);
		value_stack.pop_back();

		if (r_valid) {
			*r_valid = valid;
		}
		if (!valid) {
			value_stack.clear();
			return;
		}
	}

	set(p_names[0], value_stack.back()->get(), r_valid);
	value_stack.pop_back();

	ERR_FAIL_COND(!value_stack.is_empty());
}

Variant Object::get_indexed(const Vector<StringName> &p_names, bool *r_valid) const {
	if (p_names.is_empty()) {
		if (r_valid) {
			*r_valid = false;
		}
		return Variant();
	}
	bool valid = false;

	Variant current_value = get(p_names[0], &valid);
	for (int i = 1; i < p_names.size(); i++) {
		current_value = current_value.get_named(p_names[i], valid);

		if (!valid) {
			break;
		}
	}
	if (r_valid) {
		*r_valid = valid;
	}

	return current_value;
}

void Object::get_property_list(List<PropertyInfo> *p_list, bool p_reversed) const {
	if (script_instance && p_reversed) {
		script_instance->get_property_list(p_list);
	}

	if (_extension) {
		const ObjectGDExtension *current_extension = _extension;
		while (current_extension) {
			p_list->push_back(PropertyInfo(Variant::NIL, current_extension->class_name, PROPERTY_HINT_NONE, current_extension->class_name, PROPERTY_USAGE_CATEGORY));

			ClassDB::get_property_list(current_extension->class_name, p_list, true, this);

			if (current_extension->get_property_list) {
#ifdef TOOLS_ENABLED
				// If this is a placeholder, we can't call into the GDExtension on the parent class,
				// because we don't have a real instance of the class to give it.
				if (likely(!_extension->is_placeholder)) {
#endif
					uint32_t pcount;
					const GDExtensionPropertyInfo *pinfo = current_extension->get_property_list(_extension_instance, &pcount);
					for (uint32_t i = 0; i < pcount; i++) {
						p_list->push_back(PropertyInfo(pinfo[i]));
					}
					if (current_extension->free_property_list2) {
						current_extension->free_property_list2(_extension_instance, pinfo, pcount);
					}
#ifndef DISABLE_DEPRECATED
					else if (current_extension->free_property_list) {
						current_extension->free_property_list(_extension_instance, pinfo);
					}
#endif // DISABLE_DEPRECATED
#ifdef TOOLS_ENABLED
				}
#endif
			}

			current_extension = current_extension->parent;
		}
	}

	_get_property_listv(p_list, p_reversed);

	const uint32_t base_script_usage = is_class(Script::get_class_static()) ? PROPERTY_USAGE_NO_EDITOR : PROPERTY_USAGE_DEFAULT;
	p_list->push_back(PropertyInfo(Variant::OBJECT, "script", PROPERTY_HINT_RESOURCE_TYPE, Script::get_class_static(), base_script_usage | PROPERTY_USAGE_INTERNAL | PROPERTY_USAGE_NEVER_DUPLICATE));

	if (script_instance && !p_reversed) {
		script_instance->get_property_list(p_list);
	}

	for (const KeyValue<StringName, Variant> &K : metadata) {
		PropertyInfo pi = PropertyInfo(K.value.get_type(), "metadata/" + K.key.operator String());
		if (K.value.get_type() == Variant::OBJECT) {
			pi.hint = PROPERTY_HINT_RESOURCE_TYPE;
			Object *obj = K.value;
			if (Object::cast_to<Script>(obj)) {
				pi.hint_string = Script::get_class_static();
				pi.usage |= PROPERTY_USAGE_NEVER_DUPLICATE;
			} else {
				pi.hint_string = Resource::get_class_static();
			}
		}
		p_list->push_back(pi);
	}
}

void Object::validate_property(PropertyInfo &p_property) const {
	_validate_propertyv(p_property);

	if (_extension && _extension->validate_property) {
		// GDExtension uses a StringName rather than a String for property name.
		StringName prop_name = p_property.name;
		GDExtensionPropertyInfo gdext_prop = {
			(GDExtensionVariantType)p_property.type,
			&prop_name,
			&p_property.class_name,
			(uint32_t)p_property.hint,
			&p_property.hint_string,
			p_property.usage,
		};
		if (_extension->validate_property(_extension_instance, &gdext_prop)) {
			p_property.type = (Variant::Type)gdext_prop.type;
			p_property.name = *reinterpret_cast<StringName *>(gdext_prop.name);
			p_property.class_name = *reinterpret_cast<StringName *>(gdext_prop.class_name);
			p_property.hint = (PropertyHint)gdext_prop.hint;
			p_property.hint_string = *reinterpret_cast<String *>(gdext_prop.hint_string);
			p_property.usage = gdext_prop.usage;
		};
	}

	if (script_instance) { // Call it last to allow user altering already validated properties.
		script_instance->validate_property(p_property);
	}
}

bool Object::property_can_revert(const StringName &p_name) const {
	if (script_instance) {
		if (script_instance->property_can_revert(p_name)) {
			return true;
		}
	}

	if (_extension && _extension->property_can_revert) {
		if (_extension->property_can_revert(_extension_instance, (GDExtensionConstStringNamePtr)&p_name)) {
			return true;
		}
	}

	return _property_can_revertv(p_name);
}

Variant Object::property_get_revert(const StringName &p_name) const {
	Variant ret;

	if (script_instance) {
		if (script_instance->property_get_revert(p_name, ret)) {
			return ret;
		}
	}

	if (_extension && _extension->property_get_revert) {
		if (_extension->property_get_revert(_extension_instance, (GDExtensionConstStringNamePtr)&p_name, (GDExtensionVariantPtr)&ret)) {
			return ret;
		}
	}

	if (_property_get_revertv(p_name, ret)) {
		return ret;
	}
	return Variant();
}

void Object::get_method_list(List<MethodInfo> *p_list) const {
	ClassDB::get_method_list(get_class_name(), p_list);
	if (script_instance) {
		script_instance->get_method_list(p_list);
	}
}

Variant Object::_call_bind(const Variant **p_args, int p_argcount, Callable::CallError &r_error) {
	if (p_argcount < 1) {
		r_error.error = Callable::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS;
		r_error.expected = 1;
		return Variant();
	}

	if (!p_args[0]->is_string()) {
		r_error.error = Callable::CallError::CALL_ERROR_INVALID_ARGUMENT;
		r_error.argument = 0;
		r_error.expected = Variant::STRING_NAME;
		return Variant();
	}

	StringName method = *p_args[0];

	return callp(method, &p_args[1], p_argcount - 1, r_error);
}

Variant Object::_call_deferred_bind(const Variant **p_args, int p_argcount, Callable::CallError &r_error) {
	if (p_argcount < 1) {
		r_error.error = Callable::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS;
		r_error.expected = 1;
		return Variant();
	}

	if (!p_args[0]->is_string()) {
		r_error.error = Callable::CallError::CALL_ERROR_INVALID_ARGUMENT;
		r_error.argument = 0;
		r_error.expected = Variant::STRING_NAME;
		return Variant();
	}

	r_error.error = Callable::CallError::CALL_OK;

	StringName method = *p_args[0];

	MessageQueue::get_singleton()->push_callp(get_instance_id(), method, &p_args[1], p_argcount - 1, true);

	return Variant();
}

bool Object::has_method(const StringName &p_method) const {
	if (p_method == CoreStringName(free_)) {
		return true;
	}

	if (script_instance && script_instance->has_method(p_method)) {
		return true;
	}

	MethodBind *method = ClassDB::get_method(get_class_name(), p_method);
	if (method != nullptr) {
		return true;
	}

	const Script *scr = Object::cast_to<Script>(this);
	if (scr != nullptr) {
		return scr->has_static_method(p_method);
	}

	return false;
}

int Object::_get_method_argument_count_bind(const StringName &p_method) const {
	return get_method_argument_count(p_method);
}

int Object::get_method_argument_count(const StringName &p_method, bool *r_is_valid) const {
	if (p_method == CoreStringName(free_)) {
		if (r_is_valid) {
			*r_is_valid = true;
		}
		return 0;
	}

	if (script_instance) {
		bool valid = false;
		int ret = script_instance->get_method_argument_count(p_method, &valid);
		if (valid) {
			if (r_is_valid) {
				*r_is_valid = true;
			}
			return ret;
		}
	}

	{
		bool valid = false;
		int ret = ClassDB::get_method_argument_count(get_class_name(), p_method, &valid);
		if (valid) {
			if (r_is_valid) {
				*r_is_valid = true;
			}
			return ret;
		}
	}

	const Script *scr = Object::cast_to<Script>(this);
	while (scr != nullptr) {
		bool valid = false;
		int ret = scr->get_script_method_argument_count(p_method, &valid);
		if (valid) {
			if (r_is_valid) {
				*r_is_valid = true;
			}
			return ret;
		}
		scr = scr->get_base_script().ptr();
	}

	if (r_is_valid) {
		*r_is_valid = false;
	}
	return 0;
}

Variant Object::getvar(const Variant &p_key, bool *r_valid) const {
	if (r_valid) {
		*r_valid = false;
	}

	if (p_key.is_string()) {
		return get(p_key, r_valid);
	}
	return Variant();
}

void Object::setvar(const Variant &p_key, const Variant &p_value, bool *r_valid) {
	if (r_valid) {
		*r_valid = false;
	}
	if (p_key.is_string()) {
		return set(p_key, p_value, r_valid);
	}
}

Variant Object::callv(const StringName &p_method, const Array &p_args) {
	const Variant **argptrs = nullptr;

	if (p_args.size() > 0) {
		argptrs = (const Variant **)alloca(sizeof(Variant *) * p_args.size());
		for (int i = 0; i < p_args.size(); i++) {
			argptrs[i] = &p_args[i];
		}
	}

	Callable::CallError ce;
	const Variant ret = callp(p_method, argptrs, p_args.size(), ce);
	if (ce.error != Callable::CallError::CALL_OK) {
		ERR_FAIL_V_MSG(Variant(), vformat("Error calling method from 'callv': %s.", Variant::get_call_error_text(this, p_method, argptrs, p_args.size(), ce)));
	}
	return ret;
}

Variant Object::callp(const StringName &p_method, const Variant **p_args, int p_argcount, Callable::CallError &r_error) {
	r_error.error = Callable::CallError::CALL_OK;

	if (p_method == CoreStringName(free_)) {
//free must be here, before anything, always ready
#ifdef DEBUG_ENABLED
		if (p_argcount != 0) {
			r_error.error = Callable::CallError::CALL_ERROR_TOO_MANY_ARGUMENTS;
			r_error.expected = 0;
			return Variant();
		}
		if (is_ref_counted()) {
			r_error.error = Callable::CallError::CALL_ERROR_INVALID_METHOD;
			ERR_FAIL_V_MSG(Variant(), "Can't free a RefCounted object.");
		}

		if (_lock_index.get() > 1) {
			r_error.argument = 0;
			r_error.error = Callable::CallError::CALL_ERROR_INVALID_METHOD;
			ERR_FAIL_V_MSG(Variant(), "Object is locked and can't be freed.");
		}

#endif
		//must be here, must be before everything,
		memdelete(this);
		r_error.error = Callable::CallError::CALL_OK;
		return Variant();
	}

	Variant ret;
	OBJ_DEBUG_LOCK

	if (script_instance) {
		ret = script_instance->callp(p_method, p_args, p_argcount, r_error);
		// Force jump table.
		switch (r_error.error) {
			case Callable::CallError::CALL_OK:
				return ret;
			case Callable::CallError::CALL_ERROR_INVALID_METHOD:
				break;
			case Callable::CallError::CALL_ERROR_INVALID_ARGUMENT:
			case Callable::CallError::CALL_ERROR_TOO_MANY_ARGUMENTS:
			case Callable::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS:
			case Callable::CallError::CALL_ERROR_METHOD_NOT_CONST:
				return ret;
			case Callable::CallError::CALL_ERROR_INSTANCE_IS_NULL: {
			}
		}
	}

	//extension does not need this, because all methods are registered in MethodBind

	MethodBind *method = ClassDB::get_method(get_class_name(), p_method);

	if (method) {
		ret = method->call(this, p_args, p_argcount, r_error);
	} else {
		r_error.error = Callable::CallError::CALL_ERROR_INVALID_METHOD;
	}

	return ret;
}

Variant Object::call_const(const StringName &p_method, const Variant **p_args, int p_argcount, Callable::CallError &r_error) {
	r_error.error = Callable::CallError::CALL_OK;

	if (p_method == CoreStringName(free_)) {
		// Free is not const, so fail.
		r_error.error = Callable::CallError::CALL_ERROR_METHOD_NOT_CONST;
		return Variant();
	}

	Variant ret;
	OBJ_DEBUG_LOCK

	if (script_instance) {
		ret = script_instance->call_const(p_method, p_args, p_argcount, r_error);
		//force jumptable
		switch (r_error.error) {
			case Callable::CallError::CALL_OK:
				return ret;
			case Callable::CallError::CALL_ERROR_INVALID_METHOD:
				break;
			case Callable::CallError::CALL_ERROR_METHOD_NOT_CONST:
				break;
			case Callable::CallError::CALL_ERROR_INVALID_ARGUMENT:
			case Callable::CallError::CALL_ERROR_TOO_MANY_ARGUMENTS:
			case Callable::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS:
				return ret;
			case Callable::CallError::CALL_ERROR_INSTANCE_IS_NULL: {
			}
		}
	}

	//extension does not need this, because all methods are registered in MethodBind

	MethodBind *method = ClassDB::get_method(get_class_name(), p_method);

	if (method) {
		if (!method->is_const()) {
			r_error.error = Callable::CallError::CALL_ERROR_METHOD_NOT_CONST;
			return ret;
		}
		ret = method->call(this, p_args, p_argcount, r_error);
	} else {
		r_error.error = Callable::CallError::CALL_ERROR_INVALID_METHOD;
	}

	return ret;
}

void Object::_gdvirtual_init_method_ptr(uint32_t p_compat_hash, void *&r_fn_ptr, const StringName &p_fn_name, bool p_compat) const {
	r_fn_ptr = nullptr;
	if (_extension->get_virtual_call_data2 && _extension->call_virtual_with_data) {
		r_fn_ptr = _extension->get_virtual_call_data2(_extension->class_userdata, &p_fn_name, p_compat_hash);
	} else if (_extension->get_virtual2) {
		r_fn_ptr = (void *)_extension->get_virtual2(_extension->class_userdata, &p_fn_name, p_compat_hash);
#ifndef DISABLE_DEPRECATED
	} else if (p_compat || ClassDB::get_virtual_method_compatibility_hashes(get_class_name(), p_fn_name).size() == 0) {
		if (_extension->get_virtual_call_data && _extension->call_virtual_with_data) {
			r_fn_ptr = _extension->get_virtual_call_data(_extension->class_userdata, &p_fn_name);
		} else if (_extension->get_virtual) {
			r_fn_ptr = (void *)_extension->get_virtual(_extension->class_userdata, &p_fn_name);
		}
#endif
	}
#ifdef TOOLS_ENABLED
	if (_extension->reloadable) {
		VirtualMethodTracker *tracker = memnew(VirtualMethodTracker);
		tracker->method = (void **)&r_fn_ptr;
		tracker->next = virtual_method_list;
		virtual_method_list = tracker;
	}
#endif
	if (r_fn_ptr == nullptr) {
		r_fn_ptr = reinterpret_cast<void *>(_INVALID_GDVIRTUAL_FUNC_ADDR);
	}
}

void Object::_notification_forward(int p_notification) {
	// Notify classes starting with Object and ending with most derived subclass.
	// e.g. Object -> Node -> Node3D
	_notification_forwardv(p_notification);

	if (_extension) {
		if (_extension->notification2) {
			_extension->notification2(_extension_instance, p_notification, static_cast<GDExtensionBool>(false));
#ifndef DISABLE_DEPRECATED
		} else if (_extension->notification) {
			_extension->notification(_extension_instance, p_notification);
#endif // DISABLE_DEPRECATED
		}
	}

	if (script_instance) {
		script_instance->notification(p_notification, false);
	}
}

void Object::_notification_backward(int p_notification) {
	if (script_instance) {
		script_instance->notification(p_notification, true);
	}

	if (_extension) {
		if (_extension->notification2) {
			_extension->notification2(_extension_instance, p_notification, static_cast<GDExtensionBool>(true));
#ifndef DISABLE_DEPRECATED
		} else if (_extension->notification) {
			_extension->notification(_extension_instance, p_notification);
#endif // DISABLE_DEPRECATED
		}
	}

	// Notify classes starting with most derived subclass and ending in Object.
	// e.g. Node3D -> Node -> Object
	_notification_backwardv(p_notification);
}

String Object::to_string() {
	// Keep this method in sync with `Node::to_string`.
	if (script_instance) {
		bool valid;
		String ret = script_instance->to_string(&valid);
		if (valid) {
			return ret;
		}
	}
	if (_extension && _extension->to_string) {
		String ret;
		GDExtensionBool is_valid;
		_extension->to_string(_extension_instance, &is_valid, &ret);
		if (is_valid) {
			return ret;
		}
	}
	return _to_string();
}

void Object::set_script(const Variant &p_script) {
	if (get_script() == p_script) {
		return;
	}

	Ref<Script> s = p_script;
	if (!p_script.is_null()) {
		ERR_FAIL_COND_MSG(s.is_null(), "Cannot set object script. Parameter should be null or a reference to a valid script.");
		ERR_FAIL_COND_MSG(s->is_abstract(), vformat("Cannot set object script. Script '%s' should not be abstract.", s->get_path()));
	}

	if (script_instance) {
		memdelete(script_instance);
		script_instance = nullptr;
	}

	if (s.is_valid()) {
		if (s->can_instantiate()) {
			OBJ_DEBUG_LOCK
			script_instance = s->instance_create(this);
		} else if (Engine::get_singleton()->is_editor_hint()) {
			OBJ_DEBUG_LOCK
			script_instance = s->placeholder_instance_create(this);
		}
	}

	notify_property_list_changed(); //scripts may add variables, so refresh is desired
	emit_signal(CoreStringName(script_changed));
}

void Object::set_script_instance(ScriptInstance *p_instance) {
	if (script_instance == p_instance) {
		return;
	}

	if (script_instance) {
		memdelete(script_instance);
	}

	script_instance = p_instance;
}

Variant Object::get_script() const {
	return script_instance ? Variant(script_instance->get_script()) : Variant();
}

bool Object::has_meta(const StringName &p_name) const {
	return metadata.has(p_name);
}

void Object::set_meta(const StringName &p_name, const Variant &p_value) {
	if (p_value.get_type() == Variant::NIL) {
		if (metadata.has(p_name)) {
			metadata.erase(p_name);

			const String &sname = p_name;
			metadata_properties.erase("metadata/" + sname);
			if (!sname.begins_with("_")) {
				// Metadata starting with _ don't show up in the inspector, so no need to update.
				notify_property_list_changed();
			}
		}
		return;
	}

	HashMap<StringName, Variant>::Iterator E = metadata.find(p_name);
	if (E) {
		E->value = p_value;
	} else {
		ERR_FAIL_COND_MSG(!p_name.operator String().is_valid_ascii_identifier(), vformat("Invalid metadata identifier: '%s'.", p_name));
		Variant *V = &metadata.insert(p_name, p_value)->value;

		const String &sname = p_name;
		metadata_properties["metadata/" + sname] = V;
		if (!sname.begins_with("_")) {
			notify_property_list_changed();
		}
	}
}

Variant Object::get_meta(const StringName &p_name, const Variant &p_default) const {
	if (!metadata.has(p_name)) {
		if (p_default != Variant()) {
			return p_default;
		} else {
			ERR_FAIL_V_MSG(Variant(), vformat("The object does not have any 'meta' values with the key '%s'.", p_name));
		}
	}
	return metadata[p_name];
}

void Object::remove_meta(const StringName &p_name) {
	set_meta(p_name, Variant());
}

void Object::merge_meta_from(const Object *p_src) {
	List<StringName> meta_keys;
	p_src->get_meta_list(&meta_keys);
	for (const StringName &key : meta_keys) {
		set_meta(key, p_src->get_meta(key));
	}
}

TypedArray<Dictionary> Object::_get_property_list_bind() const {
	List<PropertyInfo> lpi;
	get_property_list(&lpi);
	return convert_property_list(&lpi);
}

TypedArray<Dictionary> Object::_get_method_list_bind() const {
	List<MethodInfo> ml;
	get_method_list(&ml);
	TypedArray<Dictionary> ret;

	for (const MethodInfo &mi : ml) {
		Dictionary d = mi;
		//va.push_back(d);
		ret.push_back(d);
	}

	return ret;
}

TypedArray<StringName> Object::_get_meta_list_bind() const {
	TypedArray<StringName> _metaret;

	for (const KeyValue<StringName, Variant> &K : metadata) {
		_metaret.push_back(K.key);
	}

	return _metaret;
}

void Object::get_meta_list(List<StringName> *p_list) const {
	for (const KeyValue<StringName, Variant> &K : metadata) {
		p_list->push_back(K.key);
	}
}

void Object::add_user_signal(const MethodInfo &p_signal) {
	ERR_FAIL_COND_MSG(p_signal.name.is_empty(), "Signal name cannot be empty.");
	ERR_FAIL_COND_MSG(ClassDB::has_signal(get_class_name(), p_signal.name), vformat("User signal's name conflicts with a built-in signal of '%s'.", get_class_name()));

	OBJ_SIGNAL_LOCK

	ERR_FAIL_COND_MSG(signal_map.has(p_signal.name), vformat("Trying to add already existing signal '%s'.", p_signal.name));
	SignalData s;
	s.user = p_signal;
	signal_map[p_signal.name] = s;
}

bool Object::_has_user_signal(const StringName &p_name) const {
	OBJ_SIGNAL_LOCK

	if (!signal_map.has(p_name)) {
		return false;
	}
	return signal_map[p_name].user.name.length() > 0;
}

void Object::_remove_user_signal(const StringName &p_name) {
	OBJ_SIGNAL_LOCK

	SignalData *s = signal_map.getptr(p_name);
	ERR_FAIL_NULL_MSG(s, "Provided signal does not exist.");
	ERR_FAIL_COND_MSG(!s->removable, "Signal is not removable (not added with add_user_signal).");
	for (const KeyValue<Callable, SignalData::Slot> &slot_kv : s->slot_map) {
		Object *target = slot_kv.key.get_object();
		if (likely(target)) {
			target->connections.erase(slot_kv.value.cE);
		}
	}

	signal_map.erase(p_name);
}

Error Object::_emit_signal(const Variant **p_args, int p_argcount, Callable::CallError &r_error) {
	if (unlikely(p_argcount < 1)) {
		r_error.error = Callable::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS;
		r_error.expected = 1;
		ERR_FAIL_V(Error::ERR_INVALID_PARAMETER);
	}

	if (unlikely(!p_args[0]->is_string())) {
		r_error.error = Callable::CallError::CALL_ERROR_INVALID_ARGUMENT;
		r_error.argument = 0;
		r_error.expected = Variant::STRING_NAME;
		ERR_FAIL_V(Error::ERR_INVALID_PARAMETER);
	}

	r_error.error = Callable::CallError::CALL_OK;

	StringName signal = *p_args[0];

	const Variant **args = nullptr;

	int argc = p_argcount - 1;
	if (argc) {
		args = &p_args[1];
	}

	return emit_signalp(signal, args, argc);
}

Error Object::emit_signalp(const StringName &p_name, const Variant **p_args, int p_argcount) {
	if (_block_signals) {
		return ERR_CANT_ACQUIRE_RESOURCE; //no emit, signals blocked
	}

	constexpr int MAX_SLOTS_ON_STACK = 5;
	// Don't default initialize the Callable objects on the stack, just reserve the space - we'll memnew_placement() them later.
	alignas(Callable) uint8_t slot_callable_stack[sizeof(Callable) * MAX_SLOTS_ON_STACK];
	uint32_t slot_flags_stack[MAX_SLOTS_ON_STACK];

	Callable *slot_callables = (Callable *)slot_callable_stack;
	uint32_t *slot_flags = slot_flags_stack;
	uint32_t slot_count = 0;

	{
		OBJ_SIGNAL_LOCK

		SignalData *s = signal_map.getptr(p_name);
		if (!s) {
#ifdef DEBUG_ENABLED
			bool signal_is_valid = ClassDB::has_signal(get_class_name(), p_name);
			//check in script
			ERR_FAIL_COND_V_MSG(!signal_is_valid && script_instance && !script_instance->get_script()->has_script_signal(p_name), ERR_UNAVAILABLE, vformat("Can't emit non-existing signal \"%s\".", p_name));
#endif
			//not connected? just return
			return ERR_UNAVAILABLE;
		}

		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());
		}

		// Ensure that disconnecting the signal or even deleting the object
		// will not affect the signal calling.
		for (const KeyValue<Callable, SignalData::Slot> &slot_kv : s->slot_map) {
			memnew_placement(&slot_callables[slot_count], Callable(slot_kv.value.conn.callable));
			slot_flags[slot_count] = slot_kv.value.conn.flags;
			++slot_count;
		}

		DEV_ASSERT(slot_count == s->slot_map.size());

		// Disconnect all one-shot connections before emitting to prevent recursion.
		for (uint32_t i = 0; i < slot_count; ++i) {
			bool disconnect = slot_flags[i] & CONNECT_ONE_SHOT;
#ifdef TOOLS_ENABLED
			if (disconnect && (slot_flags[i] & CONNECT_PERSIST) && Engine::get_singleton()->is_editor_hint()) {
				// This signal was connected from the editor, and is being edited. Just don't disconnect for now.
				disconnect = false;
			}
#endif
			if (disconnect) {
				_disconnect(p_name, slot_callables[i]);
			}
		}
	}

	OBJ_DEBUG_LOCK

	// If this is a ref-counted object, prevent it from being destroyed during signal
	// emission, which is needed in certain edge cases; e.g., GH-73889 and GH-109471.
	// Moreover, since signals can be emitted from constructors (classic example being
	// notify_property_list_changed), we must be careful not to do the ref init ourselves,
	// which would lead to the object being destroyed at the end of this function.
	bool pending_unref = Object::cast_to<RefCounted>(this) ? ((RefCounted *)this)->reference() : false;

	Error err = OK;

	Vector<const Variant *> append_source_mem;
	Variant source = this;

	for (uint32_t i = 0; i < slot_count; ++i) {
		const Callable &callable = slot_callables[i];
		const uint32_t &flags = slot_flags[i];

		if (!callable.is_valid()) {
			// Target might have been deleted during signal callback, this is expected and OK.
			continue;
		}

		const Variant **args = p_args;
		int argc = p_argcount;

		if (flags & CONNECT_APPEND_SOURCE_OBJECT) {
			// Source is being appended regardless of unbinds.
			// Implemented by inserting before the first to-be-unbinded arg.
			int source_index = p_argcount - callable.get_unbound_arguments_count();
			if (source_index >= 0) {
				append_source_mem.resize(p_argcount + 1);
				const Variant **args_mem = append_source_mem.ptrw();

				for (int j = 0; j < source_index; j++) {
					args_mem[j] = p_args[j];
				}
				args_mem[source_index] = &source;
				for (int j = source_index; j < p_argcount; j++) {
					args_mem[j + 1] = p_args[j];
				}

				args = args_mem;
				argc = p_argcount + 1;
			} else {
				// More args unbound than provided, call will fail.
				// Since appended source is non-unbindable, the error
				// about too many unbinds should be correct as is.
			}
		}

		if (flags & CONNECT_DEFERRED) {
			MessageQueue::get_singleton()->push_callablep(callable, args, argc, true);
		} else {
			Callable::CallError ce;
			_emitting = true;
			Variant ret;
			callable.callp(args, argc, ret, ce);
			_emitting = false;

			if (ce.error != Callable::CallError::CALL_OK) {
				Object *target = callable.get_object();
#ifdef DEBUG_ENABLED
				if (target && flags & CONNECT_PERSIST && Engine::get_singleton()->is_editor_hint()) {
					Ref<Script> other_scr = target->get_script();
					if (other_scr.is_valid() && !other_scr->is_tool()) {
						// Trying to call not-tool method in editor, just ignore it.
						continue;
					}
				}
#endif
				if (ce.error == Callable::CallError::CALL_ERROR_INVALID_METHOD && target && !ClassDB::class_exists(target->get_class_name())) {
					// Most likely object is not initialized yet, do not throw error.
				} else {
					ERR_PRINT(vformat("Error calling from signal '%s' to callable: %s.", String(p_name), Variant::get_callable_error_text(callable, args, argc, ce)));
					err = ERR_METHOD_NOT_FOUND;
				}
			}
		}
	}

	for (uint32_t i = 0; i < slot_count; ++i) {
		slot_callables[i].~Callable();
	}

	if (slot_callables != (Callable *)slot_callable_stack) {
		memfree(slot_callables);
		memfree(slot_flags);
	}

	if (pending_unref) {
		// We have to do the same Ref<T> would do. We can't just use Ref<T>
		// because it would do the init ref logic, which is something this function
		// shouldn't do, as explained above.
		if (((RefCounted *)this)->unreference()) {
			memdelete(this);
		}
	}

	return err;
}

void Object::_reset_gdtype() const {
	if (_extension) {
		// Set to extension's type.
		_gdtype_ptr = _extension->gdtype;
	} else {
		// Reset to internal type.
		_gdtype_ptr = &_get_typev();
	}
}

void Object::_add_user_signal(const String &p_name, const Array &p_args) {
	// this version of add_user_signal is meant to be used from scripts or external apis
	// without access to ADD_SIGNAL in bind_methods
	// added events are per instance, as opposed to the other ones, which are global

	OBJ_SIGNAL_LOCK

	MethodInfo mi;
	mi.name = p_name;

	for (const Variant &arg : p_args) {
		Dictionary d = arg;
		PropertyInfo param;

		if (d.has("name")) {
			param.name = d["name"];
		}
		if (d.has("type")) {
			param.type = (Variant::Type)(int)d["type"];
		}

		mi.arguments.push_back(param);
	}

	add_user_signal(mi);

	if (signal_map.has(p_name)) {
		signal_map.getptr(p_name)->removable = true;
	}
}

TypedArray<Dictionary> Object::_get_signal_list() const {
	List<MethodInfo> signal_list;
	get_signal_list(&signal_list);

	TypedArray<Dictionary> ret;
	for (const MethodInfo &E : signal_list) {
		ret.push_back(Dictionary(E));
	}

	return ret;
}

TypedArray<Dictionary> Object::_get_signal_connection_list(const StringName &p_signal) const {
	List<Connection> conns;
	get_all_signal_connections(&conns);

	TypedArray<Dictionary> ret;

	for (const Connection &c : conns) {
		if (c.signal.get_name() == p_signal) {
			ret.push_back(c);
		}
	}

	return ret;
}

TypedArray<Dictionary> Object::_get_incoming_connections() const {
	TypedArray<Dictionary> ret;
	for (const Object::Connection &connection : connections) {
		ret.push_back(connection);
	}

	return ret;
}

bool Object::has_signal(const StringName &p_name) const {
	if (script_instance && script_instance->get_script()->has_script_signal(p_name)) {
		return true;
	}

	if (ClassDB::has_signal(get_class_name(), p_name)) {
		return true;
	}

	if (_has_user_signal(p_name)) {
		return true;
	}

	return false;
}

void Object::get_signal_list(List<MethodInfo> *p_signals) const {
	OBJ_SIGNAL_LOCK

	if (script_instance) {
		script_instance->get_script()->get_script_signal_list(p_signals);
	}

	ClassDB::get_signal_list(get_class_name(), p_signals);
	//find maybe usersignals?

	for (const KeyValue<StringName, SignalData> &E : signal_map) {
		if (!E.value.user.name.is_empty()) {
			//user signal
			p_signals->push_back(E.value.user);
		}
	}
}

void Object::get_all_signal_connections(List<Connection> *p_connections) const {
	OBJ_SIGNAL_LOCK

	for (const KeyValue<StringName, SignalData> &E : signal_map) {
		const SignalData *s = &E.value;

		for (const KeyValue<Callable, SignalData::Slot> &slot_kv : s->slot_map) {
			p_connections->push_back(slot_kv.value.conn);
		}
	}
}

void Object::get_signal_connection_list(const StringName &p_signal, List<Connection> *p_connections) const {
	OBJ_SIGNAL_LOCK

	const SignalData *s = signal_map.getptr(p_signal);
	if (!s) {
		return; //nothing
	}

	for (const KeyValue<Callable, SignalData::Slot> &slot_kv : s->slot_map) {
		p_connections->push_back(slot_kv.value.conn);
	}
}

int Object::get_persistent_signal_connection_count() const {
	OBJ_SIGNAL_LOCK
	int count = 0;

	for (const KeyValue<StringName, SignalData> &E : signal_map) {
		const SignalData *s = &E.value;

		for (const KeyValue<Callable, SignalData::Slot> &slot_kv : s->slot_map) {
			if (slot_kv.value.conn.flags & CONNECT_PERSIST) {
				count += 1;
			}
		}
	}

	return count;
}

uint32_t Object::get_signal_connection_flags(const StringName &p_name, const Callable &p_callable) const {
	OBJ_SIGNAL_LOCK
	const SignalData *signal_data = signal_map.getptr(p_name);
	if (signal_data) {
		const SignalData::Slot *slot = signal_data->slot_map.getptr(p_callable);
		if (slot) {
			return slot->conn.flags;
		}
	}
	return 0;
}

void Object::get_signals_connected_to_this(List<Connection> *p_connections) const {
	OBJ_SIGNAL_LOCK

	for (const Connection &E : connections) {
		p_connections->push_back(E);
	}
}

Error Object::connect(const StringName &p_signal, const Callable &p_callable, uint32_t p_flags) {
	ERR_FAIL_COND_V_MSG(p_callable.is_null(), ERR_INVALID_PARAMETER, vformat("Cannot connect to '%s': the provided callable is null.", p_signal));
	OBJ_SIGNAL_LOCK

	if (p_callable.is_standard()) {
		// FIXME: This branch should probably removed in favor of the `is_valid()` branch, but there exist some classes
		// that call `connect()` before they are fully registered with ClassDB. Until all such classes can be found
		// and registered soon enough this branch is needed to allow `connect()` to succeed.
		ERR_FAIL_NULL_V_MSG(p_callable.get_object(), ERR_INVALID_PARAMETER, vformat("Cannot connect to '%s' to callable '%s': the callable object is null.", p_signal, p_callable));
	} else {
		ERR_FAIL_COND_V_MSG(!p_callable.is_valid(), ERR_INVALID_PARAMETER, vformat("Cannot connect to '%s': the provided callable is not valid: '%s'.", p_signal, p_callable));
	}

	SignalData *s = signal_map.getptr(p_signal);
	if (!s) {
		bool signal_is_valid = ClassDB::has_signal(get_class_name(), p_signal);
		//check in script
		if (!signal_is_valid && script_instance) {
			if (script_instance->get_script()->has_script_signal(p_signal)) {
				signal_is_valid = true;
			}
#ifdef TOOLS_ENABLED
			else {
				//allow connecting signals anyway if script is invalid, see issue #17070
				if (!script_instance->get_script()->is_valid()) {
					signal_is_valid = true;
				}
			}
#endif
		}

		ERR_FAIL_COND_V_MSG(!signal_is_valid, ERR_INVALID_PARAMETER, vformat("In Object of type '%s': Attempt to connect nonexistent signal '%s' to callable '%s'.", String(get_class()), p_signal, p_callable));

		signal_map[p_signal] = SignalData();
		s = &signal_map[p_signal];
	}

	//compare with the base callable, so binds can be ignored
	if (s->slot_map.has(*p_callable.get_base_comparator())) {
		if (p_flags & CONNECT_REFERENCE_COUNTED) {
			s->slot_map[*p_callable.get_base_comparator()].reference_count++;
			return OK;
		} else {
			ERR_FAIL_V_MSG(ERR_INVALID_PARAMETER, vformat("Signal '%s' is already connected to given callable '%s' in that object.", p_signal, p_callable));
		}
	}

	Object *target_object = p_callable.get_object();

	SignalData::Slot slot;

	Connection conn;
	conn.callable = p_callable;
	conn.signal = ::Signal(this, p_signal);
	conn.flags = p_flags;
	slot.conn = conn;
	if (target_object) {
		slot.cE = target_object->connections.push_back(conn);
	}
	if (p_flags & CONNECT_REFERENCE_COUNTED) {
		slot.reference_count = 1;
	}

	//use callable version as key, so binds can be ignored
	s->slot_map[*p_callable.get_base_comparator()] = slot;

	return OK;
}

bool Object::is_connected(const StringName &p_signal, const Callable &p_callable) const {
	ERR_FAIL_COND_V_MSG(p_callable.is_null(), false, vformat("Cannot determine if connected to '%s': the provided callable is null.", p_signal)); // Should use `is_null`, see note in `connect` about the use of `is_valid`.
	OBJ_SIGNAL_LOCK

	const SignalData *s = signal_map.getptr(p_signal);
	if (!s) {
		bool signal_is_valid = ClassDB::has_signal(get_class_name(), p_signal);
		if (signal_is_valid) {
			return false;
		}

		if (script_instance && script_instance->get_script()->has_script_signal(p_signal)) {
			return false;
		}

		ERR_FAIL_V_MSG(false, vformat("Nonexistent signal: '%s'.", p_signal));
	}

	return s->slot_map.has(*p_callable.get_base_comparator());
}

bool Object::has_connections(const StringName &p_signal) const {
	OBJ_SIGNAL_LOCK

	const SignalData *s = signal_map.getptr(p_signal);
	if (!s) {
		bool signal_is_valid = ClassDB::has_signal(get_class_name(), p_signal);
		if (signal_is_valid) {
			return false;
		}

		if (script_instance && script_instance->get_script()->has_script_signal(p_signal)) {
			return false;
		}

		ERR_FAIL_V_MSG(false, vformat("Nonexistent signal: '%s'.", p_signal));
	}

	return !s->slot_map.is_empty();
}

void Object::disconnect(const StringName &p_signal, const Callable &p_callable) {
	_disconnect(p_signal, p_callable);
}

bool Object::_disconnect(const StringName &p_signal, const Callable &p_callable, bool p_force) {
	ERR_FAIL_COND_V_MSG(p_callable.is_null(), false, vformat("Cannot disconnect from '%s': the provided callable is null.", p_signal)); // Should use `is_null`, see note in `connect` about the use of `is_valid`.
	OBJ_SIGNAL_LOCK

	SignalData *s = signal_map.getptr(p_signal);
	if (!s) {
		bool signal_is_valid = ClassDB::has_signal(get_class_name(), p_signal) ||
				(script_instance && script_instance->get_script()->has_script_signal(p_signal));
		ERR_FAIL_COND_V_MSG(signal_is_valid, false, vformat("Attempt to disconnect a nonexistent connection from '%s'. Signal: '%s', callable: '%s'.", to_string(), p_signal, p_callable));
	}
	ERR_FAIL_NULL_V_MSG(s, false, vformat("Disconnecting nonexistent signal '%s' in '%s'.", p_signal, to_string()));

	ERR_FAIL_COND_V_MSG(!s->slot_map.has(*p_callable.get_base_comparator()), false, vformat("Attempt to disconnect a nonexistent connection from '%s'. Signal: '%s', callable: '%s'.", to_string(), p_signal, p_callable));

	SignalData::Slot *slot = &s->slot_map[*p_callable.get_base_comparator()];

	if (!p_force) {
		slot->reference_count--; // by default is zero, if it was not referenced it will go below it
		if (slot->reference_count > 0) {
			return false;
		}
	}

	if (slot->cE) {
		Object *target_object = p_callable.get_object();
		if (target_object) {
			target_object->connections.erase(slot->cE);
		}
	}

	s->slot_map.erase(*p_callable.get_base_comparator());

	if (s->slot_map.is_empty() && ClassDB::has_signal(get_class_name(), p_signal)) {
		//not user signal, delete
		signal_map.erase(p_signal);
	}

	return true;
}

bool Object::_uses_signal_mutex() const {
	return true;
}

String Object::_get_locale() const {
	TranslationServer *ts = TranslationServer::get_singleton();
	const StringName domain_name = get_translation_domain();
	if (ts->has_domain(domain_name)) {
		const Ref<TranslationDomain> domain = ts->get_or_add_domain(domain_name);
		const String &overridden = domain->get_locale_override();
		if (!overridden.is_empty()) {
			return overridden;
		}
	}
	return ts->get_locale();
}

void Object::_set_bind(const StringName &p_set, const Variant &p_value) {
	set(p_set, p_value);
}

Variant Object::_get_bind(const StringName &p_name) const {
	return get(p_name);
}

void Object::_set_indexed_bind(const NodePath &p_name, const Variant &p_value) {
	set_indexed(p_name.get_as_property_path().get_subnames(), p_value);
}

Variant Object::_get_indexed_bind(const NodePath &p_name) const {
	return get_indexed(p_name.get_as_property_path().get_subnames());
}

void Object::initialize_class() {
	static bool initialized = false;
	if (initialized) {
		return;
	}
	_add_class_to_classdb(get_gdtype_static(), nullptr);
	_bind_methods();
	_bind_compatibility_methods();
	initialized = true;
}

StringName Object::get_translation_domain() const {
	return _translation_domain;
}

void Object::set_translation_domain(const StringName &p_domain) {
	_translation_domain = p_domain;
}

String Object::tr(const StringName &p_message, const StringName &p_context) const {
	if (!_can_translate || !TranslationServer::get_singleton()) {
		return p_message;
	}

	const Ref<TranslationDomain> domain = TranslationServer::get_singleton()->get_or_add_domain(get_translation_domain());
	return domain->translate(p_message, p_context);
}

String Object::tr_n(const StringName &p_message, const StringName &p_message_plural, int p_n, const StringName &p_context) const {
	if (!_can_translate || !TranslationServer::get_singleton()) {
		// Return message based on English plural rule if translation is not possible.
		if (p_n == 1) {
			return p_message;
		}
		return p_message_plural;
	}

	const Ref<TranslationDomain> domain = TranslationServer::get_singleton()->get_or_add_domain(get_translation_domain());
	return domain->translate_plural(p_message, p_message_plural, p_n, p_context);
}

void Object::_clear_internal_resource_paths(const Variant &p_var) {
	switch (p_var.get_type()) {
		case Variant::OBJECT: {
			Ref<Resource> r = p_var;
			if (r.is_null()) {
				return;
			}

			if (!r->is_built_in()) {
				return; //not an internal resource
			}

			Object *object = p_var;
			if (!object) {
				return;
			}

			r->set_path("");
			r->clear_internal_resource_paths();
		} break;
		case Variant::ARRAY: {
			Array a = p_var;
			for (const Variant &var : a) {
				_clear_internal_resource_paths(var);
			}

		} break;
		case Variant::DICTIONARY: {
			Dictionary d = p_var;

			for (const KeyValue<Variant, Variant> &kv : d) {
				_clear_internal_resource_paths(kv.key);
				_clear_internal_resource_paths(kv.value);
			}
		} break;
		default: {
		}
	}
}

void Object::_add_class_to_classdb(const GDType &p_type, const GDType *p_inherits) {
	ClassDB::_add_class(p_type, p_inherits);
}

void Object::_get_property_list_from_classdb(const StringName &p_class, List<PropertyInfo> *p_list, bool p_no_inheritance, const Object *p_validator) {
	ClassDB::get_property_list(p_class, p_list, p_no_inheritance, p_validator);
}

#ifdef TOOLS_ENABLED
void Object::editor_set_section_unfold(const String &p_section, bool p_unfolded, bool p_initializing) {
	if (!p_initializing) {
		set_edited(true);
	}

	if (p_unfolded) {
		editor_section_folding.insert(p_section);
	} else {
		editor_section_folding.erase(p_section);
	}
}

bool Object::editor_is_section_unfolded(const String &p_section) {
	return editor_section_folding.has(p_section);
}

#endif

void Object::clear_internal_resource_paths() {
	List<PropertyInfo> pinfo;

	get_property_list(&pinfo);

	for (const PropertyInfo &E : pinfo) {
		_clear_internal_resource_paths(get(E.name));
	}
}

void Object::notify_property_list_changed() {
	emit_signal(CoreStringName(property_list_changed));
}

String Object::_to_string() {
	return "<" + get_class() + "#" + itos(get_instance_id()) + ">";
}

void Object::_bind_methods() {
	ClassDB::bind_method(D_METHOD("get_class"), &Object::get_class);
	ClassDB::bind_method(D_METHOD("is_class", "class"), &Object::is_class);
	ClassDB::bind_method(D_METHOD("set", "property", "value"), &Object::_set_bind);
	ClassDB::bind_method(D_METHOD("get", "property"), &Object::_get_bind);
	ClassDB::bind_method(D_METHOD("set_indexed", "property_path", "value"), &Object::_set_indexed_bind);
	ClassDB::bind_method(D_METHOD("get_indexed", "property_path"), &Object::_get_indexed_bind);
	ClassDB::bind_method(D_METHOD("get_property_list"), &Object::_get_property_list_bind);
	ClassDB::bind_method(D_METHOD("get_method_list"), &Object::_get_method_list_bind);
	ClassDB::bind_method(D_METHOD("property_can_revert", "property"), &Object::property_can_revert);
	ClassDB::bind_method(D_METHOD("property_get_revert", "property"), &Object::property_get_revert);
	ClassDB::bind_method(D_METHOD("notification", "what", "reversed"), &Object::notification, DEFVAL(false));
	ClassDB::bind_method(D_METHOD("to_string"), &Object::to_string);
	ClassDB::bind_method(D_METHOD("get_instance_id"), &Object::get_instance_id);

	ClassDB::bind_method(D_METHOD("set_script", "script"), &Object::set_script);
	ClassDB::bind_method(D_METHOD("get_script"), &Object::get_script);

	ClassDB::bind_method(D_METHOD("set_meta", "name", "value"), &Object::set_meta);
	ClassDB::bind_method(D_METHOD("remove_meta", "name"), &Object::remove_meta);
	ClassDB::bind_method(D_METHOD("get_meta", "name", "default"), &Object::get_meta, DEFVAL(Variant()));
	ClassDB::bind_method(D_METHOD("has_meta", "name"), &Object::has_meta);
	ClassDB::bind_method(D_METHOD("get_meta_list"), &Object::_get_meta_list_bind);

	ClassDB::bind_method(D_METHOD("add_user_signal", "signal", "arguments"), &Object::_add_user_signal, DEFVAL(Array()));
	ClassDB::bind_method(D_METHOD("has_user_signal", "signal"), &Object::_has_user_signal);
	ClassDB::bind_method(D_METHOD("remove_user_signal", "signal"), &Object::_remove_user_signal);

	{
		MethodInfo mi;
		mi.name = "emit_signal";
		mi.arguments.push_back(PropertyInfo(Variant::STRING_NAME, "signal"));

		ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "emit_signal", &Object::_emit_signal, mi, varray(), false);
	}

	{
		MethodInfo mi;
		mi.name = "call";
		mi.arguments.push_back(PropertyInfo(Variant::STRING_NAME, "method"));

		ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "call", &Object::_call_bind, mi);
	}

	{
		MethodInfo mi;
		mi.name = "call_deferred";
		mi.arguments.push_back(PropertyInfo(Variant::STRING_NAME, "method"));

		ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "call_deferred", &Object::_call_deferred_bind, mi, varray(), false);
	}

	ClassDB::bind_method(D_METHOD("set_deferred", "property", "value"), &Object::set_deferred);

	ClassDB::bind_method(D_METHOD("callv", "method", "arg_array"), &Object::callv);

	ClassDB::bind_method(D_METHOD("has_method", "method"), &Object::has_method);

	ClassDB::bind_method(D_METHOD("get_method_argument_count", "method"), &Object::_get_method_argument_count_bind);

	ClassDB::bind_method(D_METHOD("has_signal", "signal"), &Object::has_signal);
	ClassDB::bind_method(D_METHOD("get_signal_list"), &Object::_get_signal_list);
	ClassDB::bind_method(D_METHOD("get_signal_connection_list", "signal"), &Object::_get_signal_connection_list);
	ClassDB::bind_method(D_METHOD("get_incoming_connections"), &Object::_get_incoming_connections);

	ClassDB::bind_method(D_METHOD("connect", "signal", "callable", "flags"), &Object::connect, DEFVAL(0));
	ClassDB::bind_method(D_METHOD("disconnect", "signal", "callable"), &Object::disconnect);
	ClassDB::bind_method(D_METHOD("is_connected", "signal", "callable"), &Object::is_connected);
	ClassDB::bind_method(D_METHOD("has_connections", "signal"), &Object::has_connections);

	ClassDB::bind_method(D_METHOD("set_block_signals", "enable"), &Object::set_block_signals);
	ClassDB::bind_method(D_METHOD("is_blocking_signals"), &Object::is_blocking_signals);
	ClassDB::bind_method(D_METHOD("notify_property_list_changed"), &Object::notify_property_list_changed);

	ClassDB::bind_method(D_METHOD("set_message_translation", "enable"), &Object::set_message_translation);
	ClassDB::bind_method(D_METHOD("can_translate_messages"), &Object::can_translate_messages);
	ClassDB::bind_method(D_METHOD("tr", "message", "context"), &Object::tr, DEFVAL(StringName()));
	ClassDB::bind_method(D_METHOD("tr_n", "message", "plural_message", "n", "context"), &Object::tr_n, DEFVAL(StringName()));
	ClassDB::bind_method(D_METHOD("get_translation_domain"), &Object::get_translation_domain);
	ClassDB::bind_method(D_METHOD("set_translation_domain", "domain"), &Object::set_translation_domain);

	ClassDB::bind_method(D_METHOD("is_queued_for_deletion"), &Object::is_queued_for_deletion);
	ClassDB::bind_method(D_METHOD("cancel_free"), &Object::cancel_free);

	ClassDB::add_virtual_method("Object", MethodInfo("free"), false);

	ADD_SIGNAL(MethodInfo("script_changed"));
	ADD_SIGNAL(MethodInfo("property_list_changed"));

#define BIND_OBJ_CORE_METHOD(m_method) \
	::ClassDB::add_virtual_method(get_class_static(), m_method, true, Vector<String>(), true);

	BIND_OBJ_CORE_METHOD(MethodInfo("_init"));

	BIND_OBJ_CORE_METHOD(MethodInfo(Variant::STRING, "_to_string"));

	{
		MethodInfo mi("_notification");
		mi.arguments.push_back(PropertyInfo(Variant::INT, "what"));
		mi.arguments_metadata.push_back(GodotTypeInfo::Metadata::METADATA_INT_IS_INT32);
		BIND_OBJ_CORE_METHOD(mi);
	}

	{
		MethodInfo mi("_set");
		mi.arguments.push_back(PropertyInfo(Variant::STRING_NAME, "property"));
		mi.arguments.push_back(PropertyInfo(Variant::NIL, "value", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_NIL_IS_VARIANT));
		mi.return_val.type = Variant::BOOL;
		BIND_OBJ_CORE_METHOD(mi);
	}

#ifdef TOOLS_ENABLED
	{
		MethodInfo mi("_get");
		mi.arguments.push_back(PropertyInfo(Variant::STRING_NAME, "property"));
		mi.return_val.usage |= PROPERTY_USAGE_NIL_IS_VARIANT;
		BIND_OBJ_CORE_METHOD(mi);
	}

	{
		MethodInfo mi("_get_property_list");
		mi.return_val.type = Variant::ARRAY;
		mi.return_val.hint = PROPERTY_HINT_ARRAY_TYPE;
		mi.return_val.hint_string = "Dictionary";
		BIND_OBJ_CORE_METHOD(mi);
	}

	BIND_OBJ_CORE_METHOD(MethodInfo(Variant::NIL, "_validate_property", PropertyInfo(Variant::DICTIONARY, "property")));

	BIND_OBJ_CORE_METHOD(MethodInfo(Variant::BOOL, "_property_can_revert", PropertyInfo(Variant::STRING_NAME, "property")));

	{
		MethodInfo mi("_property_get_revert");
		mi.arguments.push_back(PropertyInfo(Variant::STRING_NAME, "property"));
		mi.return_val.usage |= PROPERTY_USAGE_NIL_IS_VARIANT;
		BIND_OBJ_CORE_METHOD(mi);
	}

	// These are actually `Variant` methods, but that doesn't matter since scripts can't inherit built-in types.

	BIND_OBJ_CORE_METHOD(MethodInfo(Variant::BOOL, "_iter_init", PropertyInfo(Variant::ARRAY, "iter")));

	BIND_OBJ_CORE_METHOD(MethodInfo(Variant::BOOL, "_iter_next", PropertyInfo(Variant::ARRAY, "iter")));

	{
		MethodInfo mi("_iter_get");
		mi.arguments.push_back(PropertyInfo(Variant::NIL, "iter", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_NIL_IS_VARIANT));
		mi.return_val.usage |= PROPERTY_USAGE_NIL_IS_VARIANT;
		BIND_OBJ_CORE_METHOD(mi);
	}
#endif

	BIND_CONSTANT(NOTIFICATION_POSTINITIALIZE);
	BIND_CONSTANT(NOTIFICATION_PREDELETE);
	BIND_CONSTANT(NOTIFICATION_EXTENSION_RELOADED);

	BIND_ENUM_CONSTANT(CONNECT_DEFERRED);
	BIND_ENUM_CONSTANT(CONNECT_PERSIST);
	BIND_ENUM_CONSTANT(CONNECT_ONE_SHOT);
	BIND_ENUM_CONSTANT(CONNECT_REFERENCE_COUNTED);
	BIND_ENUM_CONSTANT(CONNECT_APPEND_SOURCE_OBJECT);
}

void Object::set_deferred(const StringName &p_property, const Variant &p_value) {
	MessageQueue::get_singleton()->push_set(this, p_property, p_value);
}

void Object::set_block_signals(bool p_block) {
	_block_signals = p_block;
}

bool Object::is_blocking_signals() const {
	return _block_signals;
}

Variant::Type Object::get_static_property_type(const StringName &p_property, bool *r_valid) const {
	bool valid;
	Variant::Type t = ClassDB::get_property_type(get_class_name(), p_property, &valid);
	if (valid) {
		if (r_valid) {
			*r_valid = true;
		}
		return t;
	}

	if (get_script_instance()) {
		return get_script_instance()->get_property_type(p_property, r_valid);
	}
	if (r_valid) {
		*r_valid = false;
	}

	return Variant::NIL;
}

Variant::Type Object::get_static_property_type_indexed(const Vector<StringName> &p_path, bool *r_valid) const {
	if (p_path.is_empty()) {
		if (r_valid) {
			*r_valid = false;
		}

		return Variant::NIL;
	}

	bool valid = false;
	Variant::Type t = get_static_property_type(p_path[0], &valid);
	if (!valid) {
		if (r_valid) {
			*r_valid = false;
		}

		return Variant::NIL;
	}

	Callable::CallError ce;
	Variant check;
	Variant::construct(t, check, nullptr, 0, ce);

	for (int i = 1; i < p_path.size(); i++) {
		if (check.get_type() == Variant::OBJECT || check.get_type() == Variant::DICTIONARY || check.get_type() == Variant::ARRAY) {
			// We cannot be sure about the type of properties this type can have
			if (r_valid) {
				*r_valid = false;
			}
			return Variant::NIL;
		}

		check = check.get_named(p_path[i], valid);

		if (!valid) {
			if (r_valid) {
				*r_valid = false;
			}
			return Variant::NIL;
		}
	}

	if (r_valid) {
		*r_valid = true;
	}

	return check.get_type();
}

bool Object::is_queued_for_deletion() const {
	return _is_queued_for_deletion;
}

#ifdef TOOLS_ENABLED
void Object::set_edited(bool p_edited) {
	_edited = p_edited;
	_edited_version++;
}

bool Object::is_edited() const {
	return _edited;
}

uint32_t Object::get_edited_version() const {
	return _edited_version;
}
#endif

const GDType &Object::get_gdtype() const {
	if (unlikely(!_gdtype_ptr)) {
		// While class is initializing / deinitializing, constructors and destructors
		// need access to the proper type at the proper stage.
		return _get_typev();
	}
	return *_gdtype_ptr;
}

bool Object::is_class(const String &p_class) const {
	for (const StringName &name : get_gdtype().get_name_hierarchy()) {
		if (name == p_class) {
			return true;
		}
	}
	return false;
}

const StringName &Object::get_class_name() const {
	return get_gdtype().get_name();
}

StringName Object::get_class_name_for_extension(const GDExtension *p_library) const {
#ifdef TOOLS_ENABLED
	// If this is the library this extension comes from and it's a placeholder, we
	// have to return the closest native parent's class name, so that it doesn't try to
	// use this like the real object.
	if (unlikely(_extension && _extension->library == p_library && _extension->is_placeholder)) {
		return get_class_name();
	}
#endif

	// Only return the class name per the extension if it matches the given p_library.
	if (_extension && _extension->library == p_library) {
		return _extension->class_name;
	}

	// Extensions only have wrapper classes for classes exposed in ClassDB.
	const StringName &class_name = get_class_name();
	if (ClassDB::is_class_exposed(class_name)) {
		return class_name;
	}

	// Find the nearest parent class that's exposed.
	StringName parent_class = ClassDB::get_parent_class(class_name);
	while (parent_class != StringName()) {
		if (ClassDB::is_class_exposed(parent_class)) {
			return parent_class;
		}
		parent_class = ClassDB::get_parent_class(parent_class);
	}

	return SNAME("Object");
}

void Object::set_instance_binding(void *p_token, void *p_binding, const GDExtensionInstanceBindingCallbacks *p_callbacks) {
	// This is only meant to be used on creation by the binder, but we also
	// need to account for reloading (where the 'binding' will be cleared).
	ERR_FAIL_COND(_instance_bindings != nullptr && _instance_bindings[0].binding != nullptr);
	if (_instance_bindings == nullptr) {
		_instance_bindings = (InstanceBinding *)memalloc(sizeof(InstanceBinding));
		_instance_binding_count = 1;
	}
	_instance_bindings[0].binding = p_binding;
	_instance_bindings[0].free_callback = p_callbacks->free_callback;
	_instance_bindings[0].reference_callback = p_callbacks->reference_callback;
	_instance_bindings[0].token = p_token;
}

void *Object::get_instance_binding(void *p_token, const GDExtensionInstanceBindingCallbacks *p_callbacks) {
	void *binding = nullptr;
	MutexLock instance_binding_lock(_instance_binding_mutex);
	for (uint32_t i = 0; i < _instance_binding_count; i++) {
		if (_instance_bindings[i].token == p_token) {
			binding = _instance_bindings[i].binding;
			break;
		}
	}
	if (unlikely(!binding && p_callbacks)) {
		uint32_t current_size = next_power_of_2(_instance_binding_count);
		uint32_t new_size = next_power_of_2(_instance_binding_count + 1);

		if (current_size == 0 || new_size > current_size) {
			_instance_bindings = (InstanceBinding *)memrealloc(_instance_bindings, new_size * sizeof(InstanceBinding));
		}

		_instance_bindings[_instance_binding_count].free_callback = p_callbacks->free_callback;
		_instance_bindings[_instance_binding_count].reference_callback = p_callbacks->reference_callback;
		_instance_bindings[_instance_binding_count].token = p_token;

		binding = p_callbacks->create_callback(p_token, this);
		_instance_bindings[_instance_binding_count].binding = binding;

#ifdef TOOLS_ENABLED
		if (!_extension && Engine::get_singleton()->is_extension_reloading_enabled()) {
			GDExtensionManager::get_singleton()->track_instance_binding(p_token, this);
		}
#endif

		_instance_binding_count++;
	}

	return binding;
}

bool Object::has_instance_binding(void *p_token) {
	bool found = false;
	MutexLock instance_binding_lock(_instance_binding_mutex);
	for (uint32_t i = 0; i < _instance_binding_count; i++) {
		if (_instance_bindings[i].token == p_token) {
			found = true;
			break;
		}
	}

	return found;
}

void Object::free_instance_binding(void *p_token) {
	bool found = false;
	MutexLock instance_binding_lock(_instance_binding_mutex);
	for (uint32_t i = 0; i < _instance_binding_count; i++) {
		if (!found && _instance_bindings[i].token == p_token) {
			if (_instance_bindings[i].free_callback) {
				_instance_bindings[i].free_callback(_instance_bindings[i].token, this, _instance_bindings[i].binding);
			}
			found = true;
		}
		if (found) {
			if (i + 1 < _instance_binding_count) {
				_instance_bindings[i] = _instance_bindings[i + 1];
			} else {
				_instance_bindings[i] = { nullptr };
			}
		}
	}
	if (found) {
		_instance_binding_count--;
	}
}

#ifdef TOOLS_ENABLED
void Object::clear_internal_extension() {
	ERR_FAIL_NULL(_extension);

	// Free the instance inside the GDExtension.
	if (_extension->free_instance) {
		_extension->free_instance(_extension->class_userdata, _extension_instance);
	}
	_extension = nullptr;
	_extension_instance = nullptr;
	// Reset GDType to internal type.
	_gdtype_ptr = &_get_typev();

	// Clear the instance bindings.
	_instance_binding_mutex.lock();
	if (_instance_bindings) {
		if (_instance_bindings[0].free_callback) {
			_instance_bindings[0].free_callback(_instance_bindings[0].token, this, _instance_bindings[0].binding);
		}
		_instance_bindings[0].binding = nullptr;
		_instance_bindings[0].token = nullptr;
		_instance_bindings[0].free_callback = nullptr;
		_instance_bindings[0].reference_callback = nullptr;
	}
	_instance_binding_mutex.unlock();

	// Clear the virtual methods.
	while (virtual_method_list) {
		(*virtual_method_list->method) = nullptr;
		virtual_method_list = virtual_method_list->next;
	}
}

void Object::reset_internal_extension(ObjectGDExtension *p_extension) {
	ERR_FAIL_COND(_extension != nullptr);

	if (p_extension) {
		_extension_instance = p_extension->recreate_instance ? p_extension->recreate_instance(p_extension->class_userdata, (GDExtensionObjectPtr)this) : nullptr;
		ERR_FAIL_NULL_MSG(_extension_instance, "Unable to recreate GDExtension instance - does this extension support hot reloading?");
		_extension = p_extension;
		_gdtype_ptr = p_extension->gdtype;
	}
}
#endif

void Object::_construct_object(bool p_reference) {
	_block_signals = false;
	_can_translate = true;
	_emitting = false;
	_is_queued_for_deletion = false;
	_predelete_ok = false;

	// ObjectDB::add_instance relies on AncestralClass::REF_COUNTED
	// being already set in the case of references.
	_ancestry = p_reference ? (uint32_t)AncestralClass::REF_COUNTED : 0;

	_instance_id = ObjectDB::add_instance(this);

#ifdef TOOLS_ENABLED
	_edited = false;
#endif

#ifdef DEBUG_ENABLED
	_lock_index.init(1);
#endif
}

Object::Object(bool p_reference) {
	_construct_object(p_reference);
}

Object::Object() {
	_construct_object(false);
}

void Object::detach_from_objectdb() {
	if (_instance_id != ObjectID()) {
		ObjectDB::remove_instance(this);
		_instance_id = ObjectID();
	}
}

void Object::assign_type_static(GDType **type_ptr, const char *p_name, const GDType *super_type) {
	static BinaryMutex _mutex;
	MutexLock lock(_mutex);
	GDType *type = *type_ptr;
	if (type) {
		// Assigned while we were waiting.
		return;
	}
	type = memnew(GDType(super_type, StringName(p_name)));
	*type_ptr = type;

	ClassDB::gdtype_autorelease_pool.push_back(type_ptr);
}

Object::~Object() {
	if (_emitting) {
		//@todo this may need to actually reach the debugger prioritarily somehow because it may crash before
		ERR_PRINT(vformat("Object '%s' was freed or unreferenced while a signal is being emitted from it. Try connecting to the signal using 'CONNECT_DEFERRED' flag, or use queue_free() to free the object (if this object is a Node) to avoid this error and potential crashes.", to_string()));
	}

	{
		OBJ_SIGNAL_LOCK
		// Drop all connections to the signals of this object.
		while (signal_map.size()) {
			// Avoid regular iteration so erasing is safe.
			KeyValue<StringName, SignalData> &E = *signal_map.begin();
			SignalData *s = &E.value;

			for (const KeyValue<Callable, SignalData::Slot> &slot_kv : s->slot_map) {
				Object *target = slot_kv.value.conn.callable.get_object();
				if (likely(target)) {
					target->connections.erase(slot_kv.value.cE);
				}
			}

			signal_map.erase(E.key);
		}

		// Disconnect signals that connect to this object.
		while (connections.size()) {
			Connection c = connections.front()->get();
			Object *obj = c.callable.get_object();
			bool disconnected = false;
			if (likely(obj)) {
				disconnected = c.signal.get_object()->_disconnect(c.signal.get_name(), c.callable, true);
			}
			if (unlikely(!disconnected)) {
				// If the disconnect has failed, abandon the connection to avoid getting trapped in an infinite loop here.
				connections.pop_front();
			}
		}
	}

	if (_instance_id != ObjectID()) {
		ObjectDB::remove_instance(this);
		_instance_id = ObjectID();
	}
	_predelete_ok = true;

	if (_instance_bindings != nullptr) {
		for (uint32_t i = 0; i < _instance_binding_count; i++) {
			if (_instance_bindings[i].free_callback) {
				_instance_bindings[i].free_callback(_instance_bindings[i].token, this, _instance_bindings[i].binding);
			}
		}
		memfree(_instance_bindings);
	}

	if (signal_mutex) {
		memdelete(signal_mutex);
	}
}

bool predelete_handler(Object *p_object) {
	return p_object->_predelete();
}

void postinitialize_handler(Object *p_object) {
	p_object->_initialize();
	p_object->_postinitialize();
}

void ObjectDB::debug_objects(DebugFunc p_func, void *p_user_data) {
	spin_lock.lock();

	for (uint32_t i = 0, count = slot_count; i < slot_max && count != 0; i++) {
		if (object_slots[i].validator) {
			p_func(object_slots[i].object, p_user_data);
			count--;
		}
	}
	spin_lock.unlock();
}

#ifdef TOOLS_ENABLED
void Object::get_argument_options(const StringName &p_function, int p_idx, List<String> *r_options) const {
	const String pf = p_function;
	if (p_idx == 0) {
		if (pf == "connect" || pf == "is_connected" || pf == "disconnect" || pf == "emit_signal" || pf == "has_signal") {
			List<MethodInfo> signals;
			get_signal_list(&signals);
			for (const MethodInfo &E : signals) {
				r_options->push_back(E.name.quote());
			}
		} else if (pf == "call" || pf == "call_deferred" || pf == "callv" || pf == "has_method") {
			List<MethodInfo> methods;
			get_method_list(&methods);
			for (const MethodInfo &E : methods) {
				if (E.name.begins_with("_") && !(E.flags & METHOD_FLAG_VIRTUAL)) {
					continue;
				}
				r_options->push_back(E.name.quote());
			}
		} else if (pf == "set" || pf == "set_deferred" || pf == "get") {
			List<PropertyInfo> properties;
			get_property_list(&properties);
			for (const PropertyInfo &E : properties) {
				if (E.usage & PROPERTY_USAGE_DEFAULT && !(E.usage & PROPERTY_USAGE_INTERNAL)) {
					r_options->push_back(E.name.quote());
				}
			}
		} else if (pf == "set_meta" || pf == "get_meta" || pf == "has_meta" || pf == "remove_meta") {
			for (const KeyValue<StringName, Variant> &K : metadata) {
				r_options->push_back(String(K.key).quote());
			}
		}
	} else if (p_idx == 2) {
		if (pf == "connect") {
			// Ideally, the constants should be inferred by the parameter.
			// But a parameter's PropertyInfo does not store the enum they come from, so this will do for now.
			List<StringName> constants;
			ClassDB::get_enum_constants("Object", "ConnectFlags", &constants);
			for (const StringName &E : constants) {
				r_options->push_back(String(E));
			}
		}
	}
}
#endif

SpinLock ObjectDB::spin_lock;
uint32_t ObjectDB::slot_count = 0;
uint32_t ObjectDB::slot_max = 0;
ObjectDB::ObjectSlot *ObjectDB::object_slots = nullptr;
uint64_t ObjectDB::validator_counter = 0;

int ObjectDB::get_object_count() {
	return slot_count;
}

ObjectID ObjectDB::add_instance(Object *p_object) {
	spin_lock.lock();
	if (unlikely(slot_count == slot_max)) {
		CRASH_COND(slot_count == (1 << OBJECTDB_SLOT_MAX_COUNT_BITS));

		uint32_t new_slot_max = slot_max > 0 ? slot_max * 2 : 1;
		object_slots = (ObjectSlot *)memrealloc(object_slots, sizeof(ObjectSlot) * new_slot_max);
		for (uint32_t i = slot_max; i < new_slot_max; i++) {
			object_slots[i].object = nullptr;
			object_slots[i].is_ref_counted = false;
			object_slots[i].next_free = i;
			object_slots[i].validator = 0;
		}
		slot_max = new_slot_max;
	}

	uint32_t slot = object_slots[slot_count].next_free;
	if (object_slots[slot].object != nullptr) {
		spin_lock.unlock();
		ERR_FAIL_COND_V(object_slots[slot].object != nullptr, ObjectID());
	}
	object_slots[slot].object = p_object;
	object_slots[slot].is_ref_counted = p_object->is_ref_counted();
	validator_counter = (validator_counter + 1) & OBJECTDB_VALIDATOR_MASK;
	if (unlikely(validator_counter == 0)) {
		validator_counter = 1;
	}
	object_slots[slot].validator = validator_counter;

	uint64_t id = validator_counter;
	id <<= OBJECTDB_SLOT_MAX_COUNT_BITS;
	id |= uint64_t(slot);

	if (p_object->is_ref_counted()) {
		id |= OBJECTDB_REFERENCE_BIT;
	}

	slot_count++;

	spin_lock.unlock();

	return ObjectID(id);
}

void ObjectDB::remove_instance(Object *p_object) {
	uint64_t t = p_object->get_instance_id();
	uint32_t slot = t & OBJECTDB_SLOT_MAX_COUNT_MASK; //slot is always valid on valid object

	spin_lock.lock();

#ifdef DEBUG_ENABLED

	if (object_slots[slot].object != p_object) {
		spin_lock.unlock();
		ERR_FAIL_COND(object_slots[slot].object != p_object);
	}
	{
		uint64_t validator = (t >> OBJECTDB_SLOT_MAX_COUNT_BITS) & OBJECTDB_VALIDATOR_MASK;
		if (object_slots[slot].validator != validator) {
			spin_lock.unlock();
			ERR_FAIL_COND(object_slots[slot].validator != validator);
		}
	}

#endif
	//decrease slot count
	slot_count--;
	//set the free slot properly
	object_slots[slot_count].next_free = slot;
	//invalidate, so checks against it fail
	object_slots[slot].validator = 0;
	object_slots[slot].is_ref_counted = false;
	object_slots[slot].object = nullptr;

	spin_lock.unlock();
}

void ObjectDB::setup() {
	//nothing to do now
}

void ObjectDB::cleanup() {
	spin_lock.lock();

	if (slot_count > 0) {
		WARN_PRINT("ObjectDB instances leaked at exit (run with --verbose for details).");
		if (OS::get_singleton()->is_stdout_verbose()) {
			// Ensure calling the native classes because if a leaked instance has a script
			// that overrides any of those methods, it'd not be OK to call them at this point,
			// now the scripting languages have already been terminated.
			MethodBind *node_get_path = ClassDB::get_method("Node", "get_path");
			MethodBind *resource_get_path = ClassDB::get_method("Resource", "get_path");
			Callable::CallError call_error;

			for (uint32_t i = 0, count = slot_count; i < slot_max && count != 0; i++) {
				if (object_slots[i].validator) {
					Object *obj = object_slots[i].object;

					String extra_info;
					if (obj->is_class("Node")) {
						extra_info = " - Node path: " + String(node_get_path->call(obj, nullptr, 0, call_error));
					}
					if (obj->is_class("Resource")) {
						extra_info = " - Resource path: " + String(resource_get_path->call(obj, nullptr, 0, call_error));
					}
					if (obj->is_class("RefCounted")) {
						extra_info = " - Reference count: " + itos((static_cast<RefCounted *>(obj))->get_reference_count());
					}

					uint64_t id = uint64_t(i) | (uint64_t(object_slots[i].validator) << OBJECTDB_SLOT_MAX_COUNT_BITS) | (object_slots[i].is_ref_counted ? OBJECTDB_REFERENCE_BIT : 0);
					DEV_ASSERT(id == (uint64_t)obj->get_instance_id()); // We could just use the id from the object, but this check may help catching memory corruption catastrophes.
					print_line("Leaked instance: " + String(obj->get_class()) + ":" + uitos(id) + extra_info);

					count--;
				}
			}
			print_line("Hint: Leaked instances typically happen when nodes are removed from the scene tree (with `remove_child()`) but not freed (with `free()` or `queue_free()`).");
		}
	}

	if (object_slots) {
		memfree(object_slots);
	}

	spin_lock.unlock();
}