Core: Implement NotNull template

Author: Repiteo

core/extension/extension_api_dump.cpp

@@ -88,7 +88,7 @@ static String get_property_info_type_name(const PropertyInfo &p_info) {
 }
 
 static String get_type_meta_name(const GodotTypeInfo::Metadata metadata) {
-	static const char *argmeta[13] = { "none", "int8", "int16", "int32", "int64", "uint8", "uint16", "uint32", "uint64", "float", "double", "char16", "char32" };
+	static const char *argmeta[14] = { "none", "int8", "int16", "int32", "int64", "uint8", "uint16", "uint32", "uint64", "float", "double", "char16", "char32", "not_null" };
 	return argmeta[metadata];
 }
 

core/extension/gdextension_interface.cpp

@@ -1359,7 +1359,7 @@ static void gdextension_object_free_instance_binding(GDExtensionObjectPtr p_obje
 
 static void gdextension_object_set_instance(GDExtensionObjectPtr p_object, GDExtensionConstStringNamePtr p_classname, GDExtensionClassInstancePtr p_instance) {
 	const StringName classname = *reinterpret_cast<const StringName *>(p_classname);
-	Object *o = (Object *)p_object;
+	NeverNull<Object *> o = NeverNull<Object *>((Object *)p_object);
 	ClassDB::set_object_extension_instance(o, classname, p_instance);
 }
 

core/object/class_db.cpp

@@ -730,8 +730,7 @@ ObjectGDExtension *ClassDB::get_placeholder_extension(const StringName &p_class)
 }
 #endif
 
-void ClassDB::set_object_extension_instance(Object *p_object, const StringName &p_class, GDExtensionClassInstancePtr p_instance) {
-	ERR_FAIL_NULL(p_object);
+void ClassDB::set_object_extension_instance(NeverNull<Object *> p_object, const StringName &p_class, GDExtensionClassInstancePtr p_instance) {
 	ClassInfo *ti;
 	{
 		Locker::Lock lock(Locker::STATE_READ);

core/object/class_db.h

@@ -325,7 +325,7 @@ class ClassDB {
 	static Object *instantiate(const StringName &p_class);
 	static Object *instantiate_no_placeholders(const StringName &p_class);
 	static Object *instantiate_without_postinitialization(const StringName &p_class);
-	static void set_object_extension_instance(Object *p_object, const StringName &p_class, GDExtensionClassInstancePtr p_instance);
+	static void set_object_extension_instance(NeverNull<Object *> p_object, const StringName &p_class, GDExtensionClassInstancePtr p_instance);
 
 	static APIType get_api_type(const StringName &p_class);