Replace NULL with nullptr

19 files changed, 376 insertions, 376 deletions

diff --git a/modules/mono/mono_gd/gd_mono.cpp b/modules/mono/mono_gd/gd_mono.cpp
index 3390aaae88..306a1997ab 100644
--- a/modules/mono/mono_gd/gd_mono.cpp
+++ b/modules/mono/mono_gd/gd_mono.cpp
@@ -76,7 +76,7 @@
 // This has turn into a gigantic mess. There's too much going on here. Too much #ifdef as well.
 // It's just painful to read... It needs to be re-structured. Please, clean this up, future me.
 
-GDMono *GDMono::singleton = NULL;
+GDMono *GDMono::singleton = nullptr;
 
 namespace {
 
@@ -332,8 +332,8 @@ void GDMono::initialize() {
 	determine_mono_dirs(assembly_rootdir, config_dir);
 
 	// Leak if we call mono_set_dirs more than once
-	mono_set_dirs(assembly_rootdir.length() ? assembly_rootdir.utf8().get_data() : NULL,
-			config_dir.length() ? config_dir.utf8().get_data() : NULL);
+	mono_set_dirs(assembly_rootdir.length() ? assembly_rootdir.utf8().get_data() : nullptr,
+			config_dir.length() ? config_dir.utf8().get_data() : nullptr);
 
 	add_mono_shared_libs_dir_to_path();
 #endif
@@ -341,7 +341,7 @@ void GDMono::initialize() {
 #ifdef ANDROID_ENABLED
 	mono_config_parse_memory(get_godot_android_mono_config().utf8().get_data());
 #else
-	mono_config_parse(NULL);
+	mono_config_parse(nullptr);
 #endif
 
 #if defined(ANDROID_ENABLED)
@@ -356,7 +356,7 @@ void GDMono::initialize() {
 	gd_mono_profiler_init();
 #endif
 
-	mono_install_unhandled_exception_hook(&unhandled_exception_hook, NULL);
+	mono_install_unhandled_exception_hook(&unhandled_exception_hook, nullptr);
 
 #ifndef TOOLS_ENABLED
 	// Exported games that don't use C# must still work. They likely don't ship with mscorlib.
@@ -375,7 +375,7 @@ void GDMono::initialize() {
 #endif
 
 	// NOTE: Internal calls must be registered after the Mono runtime initialization.
-	// Otherwise registration fails with the error: 'assertion 'hash != NULL' failed'.
+	// Otherwise registration fails with the error: 'assertion 'hash != nullptr' failed'.
 
 	root_domain = gd_initialize_mono_runtime();
 	ERR_FAIL_NULL_MSG(root_domain, "Mono: Failed to initialize runtime.");
@@ -523,7 +523,7 @@ GDMonoAssembly *GDMono::get_loaded_assembly(const String &p_name) {
 	MonoDomain *domain = mono_domain_get();
 	uint32_t domain_id = domain ? mono_domain_get_id(domain) : 0;
 	GDMonoAssembly **result = assemblies[domain_id].getptr(p_name);
-	return result ? *result : NULL;
+	return result ? *result : nullptr;
 }
 
 bool GDMono::load_assembly(const String &p_name, GDMonoAssembly **r_assembly, bool p_refonly) {
@@ -545,7 +545,7 @@ bool GDMono::load_assembly(const String &p_name, MonoAssemblyName *p_aname, GDMo
 	print_verbose("Mono: Loading assembly " + p_name + (p_refonly ? " (refonly)" : "") + "...");
 
 	MonoImageOpenStatus status = MONO_IMAGE_OK;
-	MonoAssembly *assembly = mono_assembly_load_full(p_aname, NULL, &status, p_refonly);
+	MonoAssembly *assembly = mono_assembly_load_full(p_aname, nullptr, &status, p_refonly);
 
 	if (!assembly)
 		return false;
@@ -556,7 +556,7 @@ bool GDMono::load_assembly(const String &p_name, MonoAssemblyName *p_aname, GDMo
 
 	GDMonoAssembly **stored_assembly = assemblies[domain_id].getptr(p_name);
 
-	ERR_FAIL_COND_V(stored_assembly == NULL, false);
+	ERR_FAIL_COND_V(stored_assembly == nullptr, false);
 	ERR_FAIL_COND_V((*stored_assembly)->get_assembly() != assembly, false);
 
 	*r_assembly = *stored_assembly;
@@ -596,15 +596,15 @@ ApiAssemblyInfo::Version ApiAssemblyInfo::Version::get_from_loaded_assembly(GDMo
 	if (nativecalls_klass) {
 		GDMonoField *api_hash_field = nativecalls_klass->get_field("godot_api_hash");
 		if (api_hash_field)
-			api_assembly_version.godot_api_hash = GDMonoMarshal::unbox<uint64_t>(api_hash_field->get_value(NULL));
+			api_assembly_version.godot_api_hash = GDMonoMarshal::unbox<uint64_t>(api_hash_field->get_value(nullptr));
 
 		GDMonoField *binds_ver_field = nativecalls_klass->get_field("bindings_version");
 		if (binds_ver_field)
-			api_assembly_version.bindings_version = GDMonoMarshal::unbox<uint32_t>(binds_ver_field->get_value(NULL));
+			api_assembly_version.bindings_version = GDMonoMarshal::unbox<uint32_t>(binds_ver_field->get_value(nullptr));
 
 		GDMonoField *cs_glue_ver_field = nativecalls_klass->get_field("cs_glue_version");
 		if (cs_glue_ver_field)
-			api_assembly_version.cs_glue_version = GDMonoMarshal::unbox<uint32_t>(cs_glue_ver_field->get_value(NULL));
+			api_assembly_version.cs_glue_version = GDMonoMarshal::unbox<uint32_t>(cs_glue_ver_field->get_value(nullptr));
 	}
 
 	return api_assembly_version;
@@ -735,7 +735,7 @@ bool GDMono::_temp_domain_load_are_assemblies_out_of_sync(const String &p_config
 	GDMono::LoadedApiAssembly temp_editor_api_assembly;
 
 	if (!_try_load_api_assemblies(temp_core_api_assembly, temp_editor_api_assembly,
-				p_config, /* refonly: */ true, /* loaded_callback: */ NULL)) {
+				p_config, /* refonly: */ true, /* loaded_callback: */ nullptr)) {
 		return temp_core_api_assembly.out_of_sync || temp_editor_api_assembly.out_of_sync;
 	}
 
@@ -1002,8 +1002,8 @@ void GDMono::_install_trace_listener() {
 	GDMonoClass *debug_utils = get_core_api_assembly()->get_class(BINDINGS_NAMESPACE, "DebuggingUtils");
 	GDMonoMethod *install_func = debug_utils->get_method("InstallTraceListener");
 
-	MonoException *exc = NULL;
-	install_func->invoke_raw(NULL, NULL, &exc);
+	MonoException *exc = nullptr;
+	install_func->invoke_raw(nullptr, nullptr, &exc);
 	if (exc) {
 		GDMonoUtils::debug_print_unhandled_exception(exc);
 		ERR_PRINT("Failed to install 'System.Diagnostics.Trace' listener.");
@@ -1014,7 +1014,7 @@ void GDMono::_install_trace_listener() {
 #ifndef GD_MONO_SINGLE_APPDOMAIN
 Error GDMono::_load_scripts_domain() {
 
-	ERR_FAIL_COND_V(scripts_domain != NULL, ERR_BUG);
+	ERR_FAIL_COND_V(scripts_domain != nullptr, ERR_BUG);
 
 	print_verbose("Mono: Loading scripts domain...");
 
@@ -1050,23 +1050,23 @@ Error GDMono::_unload_scripts_domain() {
 
 	_domain_assemblies_cleanup(mono_domain_get_id(scripts_domain));
 
-	core_api_assembly.assembly = NULL;
+	core_api_assembly.assembly = nullptr;
 #ifdef TOOLS_ENABLED
-	editor_api_assembly.assembly = NULL;
+	editor_api_assembly.assembly = nullptr;
 #endif
 
-	project_assembly = NULL;
+	project_assembly = nullptr;
 #ifdef TOOLS_ENABLED
-	tools_assembly = NULL;
-	tools_project_editor_assembly = NULL;
+	tools_assembly = nullptr;
+	tools_project_editor_assembly = nullptr;
 #endif
 
 	MonoDomain *domain = scripts_domain;
-	scripts_domain = NULL;
+	scripts_domain = nullptr;
 
 	print_verbose("Mono: Unloading scripts domain...");
 
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	mono_domain_try_unload(domain, (MonoObject **)&exc);
 
 	if (exc) {
@@ -1119,7 +1119,7 @@ Error GDMono::reload_scripts_domain() {
 #ifndef GD_MONO_SINGLE_APPDOMAIN
 Error GDMono::finalize_and_unload_domain(MonoDomain *p_domain) {
 
-	CRASH_COND(p_domain == NULL);
+	CRASH_COND(p_domain == nullptr);
 	CRASH_COND(p_domain == GDMono::get_singleton()->get_scripts_domain()); // Should use _unload_scripts_domain() instead
 
 	String domain_name = mono_domain_get_friendly_name(p_domain);
@@ -1137,7 +1137,7 @@ Error GDMono::finalize_and_unload_domain(MonoDomain *p_domain) {
 
 	_domain_assemblies_cleanup(mono_domain_get_id(p_domain));
 
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	mono_domain_try_unload(p_domain, (MonoObject **)&exc);
 
 	if (exc) {
@@ -1160,7 +1160,7 @@ GDMonoClass *GDMono::get_class(MonoClass *p_raw_class) {
 	uint32_t domain_id = mono_domain_get_id(mono_domain_get());
 	HashMap<String, GDMonoAssembly *> &domain_assemblies = assemblies[domain_id];
 
-	const String *k = NULL;
+	const String *k = nullptr;
 	while ((k = domain_assemblies.next(k))) {
 		GDMonoAssembly *assembly = domain_assemblies.get(*k);
 		if (assembly->get_image() == image) {
@@ -1171,7 +1171,7 @@ GDMonoClass *GDMono::get_class(MonoClass *p_raw_class) {
 		}
 	}
 
-	return NULL;
+	return nullptr;
 }
 
 GDMonoClass *GDMono::get_class(const StringName &p_namespace, const StringName &p_name) {
@@ -1183,7 +1183,7 @@ GDMonoClass *GDMono::get_class(const StringName &p_namespace, const StringName &
 	uint32_t domain_id = mono_domain_get_id(mono_domain_get());
 	HashMap<String, GDMonoAssembly *> &domain_assemblies = assemblies[domain_id];
 
-	const String *k = NULL;
+	const String *k = nullptr;
 	while ((k = domain_assemblies.next(k))) {
 		GDMonoAssembly *assembly = domain_assemblies.get(*k);
 		klass = assembly->get_class(p_namespace, p_name);
@@ -1191,14 +1191,14 @@ GDMonoClass *GDMono::get_class(const StringName &p_namespace, const StringName &
 			return klass;
 	}
 
-	return NULL;
+	return nullptr;
 }
 
 void GDMono::_domain_assemblies_cleanup(uint32_t p_domain_id) {
 
 	HashMap<String, GDMonoAssembly *> &domain_assemblies = assemblies[p_domain_id];
 
-	const String *k = NULL;
+	const String *k = nullptr;
 	while ((k = domain_assemblies.next(k))) {
 		memdelete(domain_assemblies.get(*k));
 	}
@@ -1232,14 +1232,14 @@ GDMono::GDMono() {
 	runtime_initialized = false;
 	finalizing_scripts_domain = false;
 
-	root_domain = NULL;
-	scripts_domain = NULL;
+	root_domain = nullptr;
+	scripts_domain = nullptr;
 
-	corlib_assembly = NULL;
-	project_assembly = NULL;
+	corlib_assembly = nullptr;
+	project_assembly = nullptr;
 #ifdef TOOLS_ENABLED
-	tools_assembly = NULL;
-	tools_project_editor_assembly = NULL;
+	tools_assembly = nullptr;
+	tools_project_editor_assembly = nullptr;
 #endif
 
 	api_core_hash = 0;
@@ -1282,21 +1282,21 @@ GDMono::~GDMono() {
 
 		_domain_assemblies_cleanup(mono_domain_get_id(root_domain));
 
-		core_api_assembly.assembly = NULL;
+		core_api_assembly.assembly = nullptr;
 
-		project_assembly = NULL;
+		project_assembly = nullptr;
 
-		root_domain = NULL;
-		scripts_domain = NULL;
+		root_domain = nullptr;
+		scripts_domain = nullptr;
 
 		// Leave the rest to 'mono_jit_cleanup'
 #endif
 
-		const uint32_t *k = NULL;
+		const uint32_t *k = nullptr;
 		while ((k = assemblies.next(k))) {
 			HashMap<String, GDMonoAssembly *> &domain_assemblies = assemblies.get(*k);
 
-			const String *kk = NULL;
+			const String *kk = nullptr;
 			while ((kk = domain_assemblies.next(kk))) {
 				memdelete(domain_assemblies.get(*kk));
 			}
@@ -1319,10 +1319,10 @@ GDMono::~GDMono() {
 	if (gdmono_log)
 		memdelete(gdmono_log);
 
-	singleton = NULL;
+	singleton = nullptr;
 }
 
-_GodotSharp *_GodotSharp::singleton = NULL;
+_GodotSharp *_GodotSharp::singleton = nullptr;
 
 void _GodotSharp::attach_thread() {
 
@@ -1350,7 +1350,7 @@ int32_t _GodotSharp::get_scripts_domain_id() {
 
 bool _GodotSharp::is_scripts_domain_loaded() {
 
-	return GDMono::get_singleton()->is_runtime_initialized() && GDMono::get_singleton()->get_scripts_domain() != NULL;
+	return GDMono::get_singleton()->is_runtime_initialized() && GDMono::get_singleton()->get_scripts_domain() != nullptr;
 }
 
 bool _GodotSharp::_is_domain_finalizing_for_unload(int32_t p_domain_id) {
@@ -1415,5 +1415,5 @@ _GodotSharp::_GodotSharp() {
 
 _GodotSharp::~_GodotSharp() {
 
-	singleton = NULL;
+	singleton = nullptr;
 }
diff --git a/modules/mono/mono_gd/gd_mono.h b/modules/mono/mono_gd/gd_mono.h
index f7c2426734..4898833e8e 100644
--- a/modules/mono/mono_gd/gd_mono.h
+++ b/modules/mono/mono_gd/gd_mono.h
@@ -91,7 +91,7 @@ public:
 		bool out_of_sync;
 
 		LoadedApiAssembly() :
-				assembly(NULL),
+				assembly(nullptr),
 				out_of_sync(false) {
 		}
 	};
@@ -200,7 +200,7 @@ public:
 
 #ifdef TOOLS_ENABLED
 	bool copy_prebuilt_api_assembly(ApiAssemblyInfo::Type p_api_type, const String &p_config);
-	String update_api_assemblies_from_prebuilt(const String &p_config, const bool *p_core_api_out_of_sync = NULL, const bool *p_editor_api_out_of_sync = NULL);
+	String update_api_assemblies_from_prebuilt(const String &p_config, const bool *p_core_api_out_of_sync = nullptr, const bool *p_editor_api_out_of_sync = nullptr);
 #endif
 
 	static GDMono *get_singleton() { return singleton; }
@@ -265,7 +265,7 @@ public:
 			this->prev_domain = prev_domain;
 			mono_domain_set(p_domain, false);
 		} else {
-			this->prev_domain = NULL;
+			this->prev_domain = nullptr;
 		}
 	}
 
diff --git a/modules/mono/mono_gd/gd_mono_assembly.cpp b/modules/mono/mono_gd/gd_mono_assembly.cpp
index a6a44fe8eb..8439769d84 100644
--- a/modules/mono/mono_gd/gd_mono_assembly.cpp
+++ b/modules/mono/mono_gd/gd_mono_assembly.cpp
@@ -144,7 +144,7 @@ MonoAssembly *GDMonoAssembly::_search_hook(MonoAssemblyName *aname, void *user_d
 	if (loaded_asm)
 		return loaded_asm->get_assembly();
 
-	return NULL;
+	return nullptr;
 }
 
 MonoAssembly *GDMonoAssembly::_preload_hook(MonoAssemblyName *aname, char **, void *user_data, bool refonly) {
@@ -157,7 +157,7 @@ MonoAssembly *GDMonoAssembly::_preload_hook(MonoAssemblyName *aname, char **, vo
 
 MonoAssembly *GDMonoAssembly::_load_assembly_search(const String &p_name, const Vector<String> &p_search_dirs, bool p_refonly) {
 
-	MonoAssembly *res = NULL;
+	MonoAssembly *res = nullptr;
 	String path;
 
 	bool has_extension = p_name.ends_with(".dll") || p_name.ends_with(".exe");
@@ -169,27 +169,27 @@ MonoAssembly *GDMonoAssembly::_load_assembly_search(const String &p_name, const
 			path = search_dir.plus_file(p_name);
 			if (FileAccess::exists(path)) {
 				res = _real_load_assembly_from(path, p_refonly);
-				if (res != NULL)
+				if (res != nullptr)
 					return res;
 			}
 		} else {
 			path = search_dir.plus_file(p_name + ".dll");
 			if (FileAccess::exists(path)) {
 				res = _real_load_assembly_from(path, p_refonly);
-				if (res != NULL)
+				if (res != nullptr)
 					return res;
 			}
 
 			path = search_dir.plus_file(p_name + ".exe");
 			if (FileAccess::exists(path)) {
 				res = _real_load_assembly_from(path, p_refonly);
-				if (res != NULL)
+				if (res != nullptr)
 					return res;
 			}
 		}
 	}
 
-	return NULL;
+	return nullptr;
 }
 
 String GDMonoAssembly::find_assembly(const String &p_name) {
@@ -223,17 +223,17 @@ void GDMonoAssembly::initialize() {
 
 	fill_search_dirs(search_dirs);
 
-	mono_install_assembly_search_hook(&assembly_search_hook, NULL);
-	mono_install_assembly_refonly_search_hook(&assembly_refonly_search_hook, NULL);
-	mono_install_assembly_preload_hook(&assembly_preload_hook, NULL);
-	mono_install_assembly_refonly_preload_hook(&assembly_refonly_preload_hook, NULL);
-	mono_install_assembly_load_hook(&assembly_load_hook, NULL);
+	mono_install_assembly_search_hook(&assembly_search_hook, nullptr);
+	mono_install_assembly_refonly_search_hook(&assembly_refonly_search_hook, nullptr);
+	mono_install_assembly_preload_hook(&assembly_preload_hook, nullptr);
+	mono_install_assembly_refonly_preload_hook(&assembly_refonly_preload_hook, nullptr);
+	mono_install_assembly_load_hook(&assembly_load_hook, nullptr);
 }
 
 MonoAssembly *GDMonoAssembly::_real_load_assembly_from(const String &p_path, bool p_refonly) {
 
 	Vector<uint8_t> data = FileAccess::get_file_as_array(p_path);
-	ERR_FAIL_COND_V_MSG(data.empty(), NULL, "Could read the assembly in the specified location");
+	ERR_FAIL_COND_V_MSG(data.empty(), nullptr, "Could read the assembly in the specified location");
 
 	String image_filename;
 
@@ -255,7 +255,7 @@ MonoAssembly *GDMonoAssembly::_real_load_assembly_from(const String &p_path, boo
 			true, &status, p_refonly,
 			image_filename.utf8());
 
-	ERR_FAIL_COND_V_MSG(status != MONO_IMAGE_OK || !image, NULL, "Failed to open assembly image from the loaded data");
+	ERR_FAIL_COND_V_MSG(status != MONO_IMAGE_OK || !image, nullptr, "Failed to open assembly image from the loaded data");
 
 #ifdef DEBUG_ENABLED
 	Vector<uint8_t> pdb_data;
@@ -281,7 +281,7 @@ no_pdb:
 
 	MonoAssembly *assembly = mono_assembly_load_from_full(image, image_filename.utf8().get_data(), &status, p_refonly);
 
-	ERR_FAIL_COND_V_MSG(status != MONO_IMAGE_OK || !assembly, NULL, "Failed to load assembly for image");
+	ERR_FAIL_COND_V_MSG(status != MONO_IMAGE_OK || !assembly, nullptr, "Failed to load assembly for image");
 
 	// Decrement refcount which was previously incremented by mono_image_open_from_data_with_name
 	mono_image_close(image);
@@ -300,8 +300,8 @@ void GDMonoAssembly::unload() {
 	cached_classes.clear();
 	cached_raw.clear();
 
-	assembly = NULL;
-	image = NULL;
+	assembly = nullptr;
+	image = nullptr;
 }
 
 String GDMonoAssembly::get_path() const {
@@ -310,7 +310,7 @@ String GDMonoAssembly::get_path() const {
 
 GDMonoClass *GDMonoAssembly::get_class(const StringName &p_namespace, const StringName &p_name) {
 
-	ERR_FAIL_NULL_V(image, NULL);
+	ERR_FAIL_NULL_V(image, nullptr);
 
 	ClassKey key(p_namespace, p_name);
 
@@ -322,7 +322,7 @@ GDMonoClass *GDMonoAssembly::get_class(const StringName &p_namespace, const Stri
 	MonoClass *mono_class = mono_class_from_name(image, String(p_namespace).utf8(), String(p_name).utf8());
 
 	if (!mono_class)
-		return NULL;
+		return nullptr;
 
 	GDMonoClass *wrapped_class = memnew(GDMonoClass(p_namespace, p_name, mono_class, this));
 
@@ -334,7 +334,7 @@ GDMonoClass *GDMonoAssembly::get_class(const StringName &p_namespace, const Stri
 
 GDMonoClass *GDMonoAssembly::get_class(MonoClass *p_mono_class) {
 
-	ERR_FAIL_NULL_V(image, NULL);
+	ERR_FAIL_NULL_V(image, nullptr);
 
 	Map<MonoClass *, GDMonoClass *>::Element *match = cached_raw.find(p_mono_class);
 
@@ -354,7 +354,7 @@ GDMonoClass *GDMonoAssembly::get_class(MonoClass *p_mono_class) {
 
 GDMonoClass *GDMonoAssembly::get_object_derived_class(const StringName &p_class) {
 
-	GDMonoClass *match = NULL;
+	GDMonoClass *match = nullptr;
 
 	if (gdobject_class_cache_updated) {
 		Map<StringName, GDMonoClass *>::Element *result = gdobject_class_cache.find(p_class);
@@ -386,7 +386,7 @@ GDMonoClass *GDMonoAssembly::get_object_derived_class(const StringName &p_class)
 				GDMonoClass *current_nested = nested_classes.front()->get();
 				nested_classes.pop_back();
 
-				void *iter = NULL;
+				void *iter = nullptr;
 
 				while (true) {
 					MonoClass *raw_nested = mono_class_get_nested_types(current_nested->get_mono_ptr(), &iter);
@@ -425,11 +425,11 @@ GDMonoAssembly *GDMonoAssembly::load_from(const String &p_name, const String &p_
 
 	if (!assembly) {
 		assembly = _real_load_assembly_from(p_path, p_refonly);
-		ERR_FAIL_NULL_V(assembly, NULL);
+		ERR_FAIL_NULL_V(assembly, nullptr);
 	}
 
 	GDMonoAssembly *loaded_asm = GDMono::get_singleton()->get_loaded_assembly(p_name);
-	ERR_FAIL_NULL_V_MSG(loaded_asm, NULL, "Loaded assembly missing from table. Did we not receive the load hook?");
+	ERR_FAIL_NULL_V_MSG(loaded_asm, nullptr, "Loaded assembly missing from table. Did we not receive the load hook?");
 
 	return loaded_asm;
 }
diff --git a/modules/mono/mono_gd/gd_mono_cache.cpp b/modules/mono/mono_gd/gd_mono_cache.cpp
index e493098211..40cc41122b 100644
--- a/modules/mono/mono_gd/gd_mono_cache.cpp
+++ b/modules/mono/mono_gd/gd_mono_cache.cpp
@@ -40,11 +40,11 @@ namespace GDMonoCache {
 
 CachedData cached_data;
 
-#define CACHE_AND_CHECK(m_var, m_val)                                               \
-	{                                                                               \
-		CRASH_COND(m_var != NULL);                                                  \
-		m_var = m_val;                                                              \
-		ERR_FAIL_COND_MSG(m_var == NULL, "Mono Cache: Member " #m_var " is null."); \
+#define CACHE_AND_CHECK(m_var, m_val)                                                  \
+	{                                                                                  \
+		CRASH_COND(m_var != nullptr);                                                  \
+		m_var = m_val;                                                                 \
+		ERR_FAIL_COND_MSG(m_var == nullptr, "Mono Cache: Member " #m_var " is null."); \
 	}
 
 #define CACHE_CLASS_AND_CHECK(m_class, m_val) CACHE_AND_CHECK(cached_data.class_##m_class, m_val)
@@ -54,12 +54,12 @@ CachedData cached_data;
 #define CACHE_METHOD_AND_CHECK(m_class, m_method, m_val) CACHE_AND_CHECK(cached_data.method_##m_class##_##m_method, m_val)
 #define CACHE_PROPERTY_AND_CHECK(m_class, m_property, m_val) CACHE_AND_CHECK(cached_data.property_##m_class##_##m_property, m_val)
 
-#define CACHE_METHOD_THUNK_AND_CHECK_IMPL(m_var, m_val)                                        \
-	{                                                                                          \
-		CRASH_COND(!m_var.is_null());                                                          \
-		ERR_FAIL_COND_MSG(m_val == NULL, "Mono Cache: Method for member " #m_var " is null."); \
-		m_var.set_from_method(m_val);                                                          \
-		ERR_FAIL_COND_MSG(m_var.is_null(), "Mono Cache: Member " #m_var " is null.");          \
+#define CACHE_METHOD_THUNK_AND_CHECK_IMPL(m_var, m_val)                                           \
+	{                                                                                             \
+		CRASH_COND(!m_var.is_null());                                                             \
+		ERR_FAIL_COND_MSG(m_val == nullptr, "Mono Cache: Method for member " #m_var " is null."); \
+		m_var.set_from_method(m_val);                                                             \
+		ERR_FAIL_COND_MSG(m_var.is_null(), "Mono Cache: Member " #m_var " is null.");             \
 	}
 
 #define CACHE_METHOD_THUNK_AND_CHECK(m_class, m_method, m_val) CACHE_METHOD_THUNK_AND_CHECK_IMPL(cached_data.methodthunk_##m_class##_##m_method, m_val)
@@ -68,93 +68,93 @@ void CachedData::clear_corlib_cache() {
 
 	corlib_cache_updated = false;
 
-	class_MonoObject = NULL;
-	class_bool = NULL;
-	class_int8_t = NULL;
-	class_int16_t = NULL;
-	class_int32_t = NULL;
-	class_int64_t = NULL;
-	class_uint8_t = NULL;
-	class_uint16_t = NULL;
-	class_uint32_t = NULL;
-	class_uint64_t = NULL;
-	class_float = NULL;
-	class_double = NULL;
-	class_String = NULL;
-	class_IntPtr = NULL;
-
-	class_System_Collections_IEnumerable = NULL;
-	class_System_Collections_IDictionary = NULL;
+	class_MonoObject = nullptr;
+	class_bool = nullptr;
+	class_int8_t = nullptr;
+	class_int16_t = nullptr;
+	class_int32_t = nullptr;
+	class_int64_t = nullptr;
+	class_uint8_t = nullptr;
+	class_uint16_t = nullptr;
+	class_uint32_t = nullptr;
+	class_uint64_t = nullptr;
+	class_float = nullptr;
+	class_double = nullptr;
+	class_String = nullptr;
+	class_IntPtr = nullptr;
+
+	class_System_Collections_IEnumerable = nullptr;
+	class_System_Collections_IDictionary = nullptr;
 
 #ifdef DEBUG_ENABLED
-	class_System_Diagnostics_StackTrace = NULL;
+	class_System_Diagnostics_StackTrace = nullptr;
 	methodthunk_System_Diagnostics_StackTrace_GetFrames.nullify();
-	method_System_Diagnostics_StackTrace_ctor_bool = NULL;
-	method_System_Diagnostics_StackTrace_ctor_Exception_bool = NULL;
+	method_System_Diagnostics_StackTrace_ctor_bool = nullptr;
+	method_System_Diagnostics_StackTrace_ctor_Exception_bool = nullptr;
 #endif
 
-	class_KeyNotFoundException = NULL;
+	class_KeyNotFoundException = nullptr;
 }
 
 void CachedData::clear_godot_api_cache() {
 
 	godot_api_cache_updated = false;
 
-	rawclass_Dictionary = NULL;
-
-	class_Vector2 = NULL;
-	class_Vector2i = NULL;
-	class_Rect2 = NULL;
-	class_Rect2i = NULL;
-	class_Transform2D = NULL;
-	class_Vector3 = NULL;
-	class_Vector3i = NULL;
-	class_Basis = NULL;
-	class_Quat = NULL;
-	class_Transform = NULL;
-	class_AABB = NULL;
-	class_Color = NULL;
-	class_Plane = NULL;
-	class_StringName = NULL;
-	class_NodePath = NULL;
-	class_RID = NULL;
-	class_GodotObject = NULL;
-	class_GodotResource = NULL;
-	class_Node = NULL;
-	class_Control = NULL;
-	class_Node3D = NULL;
-	class_WeakRef = NULL;
-	class_Callable = NULL;
-	class_SignalInfo = NULL;
-	class_Array = NULL;
-	class_Dictionary = NULL;
-	class_MarshalUtils = NULL;
-	class_ISerializationListener = NULL;
+	rawclass_Dictionary = nullptr;
+
+	class_Vector2 = nullptr;
+	class_Vector2i = nullptr;
+	class_Rect2 = nullptr;
+	class_Rect2i = nullptr;
+	class_Transform2D = nullptr;
+	class_Vector3 = nullptr;
+	class_Vector3i = nullptr;
+	class_Basis = nullptr;
+	class_Quat = nullptr;
+	class_Transform = nullptr;
+	class_AABB = nullptr;
+	class_Color = nullptr;
+	class_Plane = nullptr;
+	class_StringName = nullptr;
+	class_NodePath = nullptr;
+	class_RID = nullptr;
+	class_GodotObject = nullptr;
+	class_GodotResource = nullptr;
+	class_Node = nullptr;
+	class_Control = nullptr;
+	class_Node3D = nullptr;
+	class_WeakRef = nullptr;
+	class_Callable = nullptr;
+	class_SignalInfo = nullptr;
+	class_Array = nullptr;
+	class_Dictionary = nullptr;
+	class_MarshalUtils = nullptr;
+	class_ISerializationListener = nullptr;
 
 #ifdef DEBUG_ENABLED
-	class_DebuggingUtils = NULL;
+	class_DebuggingUtils = nullptr;
 	methodthunk_DebuggingUtils_GetStackFrameInfo.nullify();
 #endif
 
-	class_ExportAttribute = NULL;
-	field_ExportAttribute_hint = NULL;
-	field_ExportAttribute_hintString = NULL;
-	class_SignalAttribute = NULL;
-	class_ToolAttribute = NULL;
-	class_RemoteAttribute = NULL;
-	class_MasterAttribute = NULL;
-	class_PuppetAttribute = NULL;
-	class_RemoteSyncAttribute = NULL;
-	class_MasterSyncAttribute = NULL;
-	class_PuppetSyncAttribute = NULL;
-	class_GodotMethodAttribute = NULL;
-	field_GodotMethodAttribute_methodName = NULL;
-
-	field_GodotObject_ptr = NULL;
-	field_StringName_ptr = NULL;
-	field_NodePath_ptr = NULL;
-	field_Image_ptr = NULL;
-	field_RID_ptr = NULL;
+	class_ExportAttribute = nullptr;
+	field_ExportAttribute_hint = nullptr;
+	field_ExportAttribute_hintString = nullptr;
+	class_SignalAttribute = nullptr;
+	class_ToolAttribute = nullptr;
+	class_RemoteAttribute = nullptr;
+	class_MasterAttribute = nullptr;
+	class_PuppetAttribute = nullptr;
+	class_RemoteSyncAttribute = nullptr;
+	class_MasterSyncAttribute = nullptr;
+	class_PuppetSyncAttribute = nullptr;
+	class_GodotMethodAttribute = nullptr;
+	field_GodotMethodAttribute_methodName = nullptr;
+
+	field_GodotObject_ptr = nullptr;
+	field_StringName_ptr = nullptr;
+	field_NodePath_ptr = nullptr;
+	field_Image_ptr = nullptr;
+	field_RID_ptr = nullptr;
 
 	methodthunk_GodotObject_Dispose.nullify();
 	methodthunk_Array_GetPtr.nullify();
diff --git a/modules/mono/mono_gd/gd_mono_class.cpp b/modules/mono/mono_gd/gd_mono_class.cpp
index 648f5f6c6b..ede4203e35 100644
--- a/modules/mono/mono_gd/gd_mono_class.cpp
+++ b/modules/mono/mono_gd/gd_mono_class.cpp
@@ -40,7 +40,7 @@ String GDMonoClass::get_full_name(MonoClass *p_mono_class) {
 	// mono_type_get_full_name is not exposed to embedders, but this seems to do the job
 	MonoReflectionType *type_obj = mono_type_get_object(mono_domain_get(), get_mono_type(p_mono_class));
 
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	MonoString *str = GDMonoUtils::object_to_string((MonoObject *)type_obj, &exc);
 	UNHANDLED_EXCEPTION(exc);
 
@@ -76,12 +76,12 @@ bool GDMonoClass::is_assignable_from(GDMonoClass *p_from) const {
 
 GDMonoClass *GDMonoClass::get_parent_class() {
 	MonoClass *parent_mono_class = mono_class_get_parent(mono_class);
-	return parent_mono_class ? GDMono::get_singleton()->get_class(parent_mono_class) : NULL;
+	return parent_mono_class ? GDMono::get_singleton()->get_class(parent_mono_class) : nullptr;
 }
 
 GDMonoClass *GDMonoClass::get_nesting_class() {
 	MonoClass *nesting_type = mono_class_get_nesting_type(mono_class);
-	return nesting_type ? GDMono::get_singleton()->get_class(nesting_type) : NULL;
+	return nesting_type ? GDMono::get_singleton()->get_class(nesting_type) : nullptr;
 }
 
 #ifdef TOOLS_ENABLED
@@ -92,9 +92,9 @@ Vector<MonoClassField *> GDMonoClass::get_enum_fields() {
 
 	Vector<MonoClassField *> enum_fields;
 
-	void *iter = NULL;
-	MonoClassField *raw_field = NULL;
-	while ((raw_field = mono_class_get_fields(get_mono_ptr(), &iter)) != NULL) {
+	void *iter = nullptr;
+	MonoClassField *raw_field = nullptr;
+	while ((raw_field = mono_class_get_fields(get_mono_ptr(), &iter)) != nullptr) {
 		uint32_t field_flags = mono_field_get_flags(raw_field);
 
 		// Enums have an instance field named value__ which holds the value of the enum.
@@ -126,21 +126,21 @@ bool GDMonoClass::has_attribute(GDMonoClass *p_attr_class) {
 MonoObject *GDMonoClass::get_attribute(GDMonoClass *p_attr_class) {
 
 #ifdef DEBUG_ENABLED
-	ERR_FAIL_NULL_V(p_attr_class, NULL);
+	ERR_FAIL_NULL_V(p_attr_class, nullptr);
 #endif
 
 	if (!attrs_fetched)
 		fetch_attributes();
 
 	if (!attributes)
-		return NULL;
+		return nullptr;
 
 	return mono_custom_attrs_get_attr(attributes, p_attr_class->get_mono_ptr());
 }
 
 void GDMonoClass::fetch_attributes() {
 
-	ERR_FAIL_COND(attributes != NULL);
+	ERR_FAIL_COND(attributes != nullptr);
 
 	attributes = mono_custom_attrs_from_class(get_mono_ptr());
 	attrs_fetched = true;
@@ -153,9 +153,9 @@ void GDMonoClass::fetch_methods_with_godot_api_checks(GDMonoClass *p_native_base
 	if (methods_fetched)
 		return;
 
-	void *iter = NULL;
-	MonoMethod *raw_method = NULL;
-	while ((raw_method = mono_class_get_methods(get_mono_ptr(), &iter)) != NULL) {
+	void *iter = nullptr;
+	MonoMethod *raw_method = nullptr;
+	while ((raw_method = mono_class_get_methods(get_mono_ptr(), &iter)) != nullptr) {
 		StringName name = mono_method_get_name(raw_method);
 
 		// get_method implicitly fetches methods and adds them to this->methods
@@ -198,7 +198,7 @@ void GDMonoClass::fetch_methods_with_godot_api_checks(GDMonoClass *p_native_base
 		}
 #endif
 
-		uint32_t flags = mono_method_get_flags(method->mono_method, NULL);
+		uint32_t flags = mono_method_get_flags(method->mono_method, nullptr);
 
 		if (!(flags & MONO_METHOD_ATTR_VIRTUAL))
 			continue;
@@ -242,21 +242,21 @@ void GDMonoClass::fetch_methods_with_godot_api_checks(GDMonoClass *p_native_base
 
 GDMonoMethod *GDMonoClass::get_fetched_method_unknown_params(const StringName &p_name) {
 
-	ERR_FAIL_COND_V(!methods_fetched, NULL);
+	ERR_FAIL_COND_V(!methods_fetched, nullptr);
 
-	const MethodKey *k = NULL;
+	const MethodKey *k = nullptr;
 
 	while ((k = methods.next(k))) {
 		if (k->name == p_name)
 			return methods.get(*k);
 	}
 
-	return NULL;
+	return nullptr;
 }
 
 bool GDMonoClass::has_fetched_method_unknown_params(const StringName &p_name) {
 
-	return get_fetched_method_unknown_params(p_name) != NULL;
+	return get_fetched_method_unknown_params(p_name) != nullptr;
 }
 
 bool GDMonoClass::implements_interface(GDMonoClass *p_interface) {
@@ -274,7 +274,7 @@ GDMonoMethod *GDMonoClass::get_method(const StringName &p_name, int p_params_cou
 		return *match;
 
 	if (methods_fetched)
-		return NULL;
+		return nullptr;
 
 	MonoMethod *raw_method = mono_class_get_method_from_name(mono_class, String(p_name).utf8().get_data(), p_params_count);
 
@@ -285,7 +285,7 @@ GDMonoMethod *GDMonoClass::get_method(const StringName &p_name, int p_params_cou
 		return method;
 	}
 
-	return NULL;
+	return nullptr;
 }
 
 GDMonoMethod *GDMonoClass::get_method(MonoMethod *p_raw_method) {
@@ -307,7 +307,7 @@ GDMonoMethod *GDMonoClass::get_method(MonoMethod *p_raw_method, const StringName
 
 GDMonoMethod *GDMonoClass::get_method(MonoMethod *p_raw_method, const StringName &p_name, int p_params_count) {
 
-	ERR_FAIL_NULL_V(p_raw_method, NULL);
+	ERR_FAIL_NULL_V(p_raw_method, nullptr);
 
 	MethodKey key = MethodKey(p_name, p_params_count);
 
@@ -328,7 +328,7 @@ GDMonoMethod *GDMonoClass::get_method_with_desc(const String &p_description, boo
 	MonoMethod *method = mono_method_desc_search_in_class(desc, mono_class);
 	mono_method_desc_free(desc);
 
-	ERR_FAIL_COND_V(mono_method_get_class(method) != mono_class, NULL);
+	ERR_FAIL_COND_V(mono_method_get_class(method) != mono_class, nullptr);
 
 	return get_method(method);
 }
@@ -341,7 +341,7 @@ GDMonoField *GDMonoClass::get_field(const StringName &p_name) {
 		return result->value();
 
 	if (fields_fetched)
-		return NULL;
+		return nullptr;
 
 	MonoClassField *raw_field = mono_class_get_field_from_name(mono_class, String(p_name).utf8().get_data());
 
@@ -352,7 +352,7 @@ GDMonoField *GDMonoClass::get_field(const StringName &p_name) {
 		return field;
 	}
 
-	return NULL;
+	return nullptr;
 }
 
 const Vector<GDMonoField *> &GDMonoClass::get_all_fields() {
@@ -360,9 +360,9 @@ const Vector<GDMonoField *> &GDMonoClass::get_all_fields() {
 	if (fields_fetched)
 		return fields_list;
 
-	void *iter = NULL;
-	MonoClassField *raw_field = NULL;
-	while ((raw_field = mono_class_get_fields(mono_class, &iter)) != NULL) {
+	void *iter = nullptr;
+	MonoClassField *raw_field = nullptr;
+	while ((raw_field = mono_class_get_fields(mono_class, &iter)) != nullptr) {
 		StringName name = mono_field_get_name(raw_field);
 
 		Map<StringName, GDMonoField *>::Element *match = fields.find(name);
@@ -389,7 +389,7 @@ GDMonoProperty *GDMonoClass::get_property(const StringName &p_name) {
 		return result->value();
 
 	if (properties_fetched)
-		return NULL;
+		return nullptr;
 
 	MonoProperty *raw_property = mono_class_get_property_from_name(mono_class, String(p_name).utf8().get_data());
 
@@ -400,7 +400,7 @@ GDMonoProperty *GDMonoClass::get_property(const StringName &p_name) {
 		return property;
 	}
 
-	return NULL;
+	return nullptr;
 }
 
 const Vector<GDMonoProperty *> &GDMonoClass::get_all_properties() {
@@ -408,9 +408,9 @@ const Vector<GDMonoProperty *> &GDMonoClass::get_all_properties() {
 	if (properties_fetched)
 		return properties_list;
 
-	void *iter = NULL;
-	MonoProperty *raw_property = NULL;
-	while ((raw_property = mono_class_get_properties(mono_class, &iter)) != NULL) {
+	void *iter = nullptr;
+	MonoProperty *raw_property = nullptr;
+	while ((raw_property = mono_class_get_properties(mono_class, &iter)) != nullptr) {
 		StringName name = mono_property_get_name(raw_property);
 
 		Map<StringName, GDMonoProperty *>::Element *match = properties.find(name);
@@ -433,9 +433,9 @@ const Vector<GDMonoClass *> &GDMonoClass::get_all_delegates() {
 	if (delegates_fetched)
 		return delegates_list;
 
-	void *iter = NULL;
-	MonoClass *raw_class = NULL;
-	while ((raw_class = mono_class_get_nested_types(mono_class, &iter)) != NULL) {
+	void *iter = nullptr;
+	MonoClass *raw_class = nullptr;
+	while ((raw_class = mono_class_get_nested_types(mono_class, &iter)) != nullptr) {
 		if (mono_class_is_delegate(raw_class)) {
 			StringName name = mono_class_get_name(raw_class);
 
@@ -459,9 +459,9 @@ const Vector<GDMonoClass *> &GDMonoClass::get_all_delegates() {
 const Vector<GDMonoMethod *> &GDMonoClass::get_all_methods() {
 
 	if (!method_list_fetched) {
-		void *iter = NULL;
-		MonoMethod *raw_method = NULL;
-		while ((raw_method = mono_class_get_methods(get_mono_ptr(), &iter)) != NULL) {
+		void *iter = nullptr;
+		MonoMethod *raw_method = nullptr;
+		while ((raw_method = mono_class_get_methods(get_mono_ptr(), &iter)) != nullptr) {
 			method_list.push_back(memnew(GDMonoMethod(mono_method_get_name(raw_method), raw_method)));
 		}
 
@@ -479,7 +479,7 @@ GDMonoClass::GDMonoClass(const StringName &p_namespace, const StringName &p_name
 	assembly = p_assembly;
 
 	attrs_fetched = false;
-	attributes = NULL;
+	attributes = nullptr;
 
 	methods_fetched = false;
 	method_list_fetched = false;
@@ -512,7 +512,7 @@ GDMonoClass::~GDMonoClass() {
 		Vector<GDMonoMethod *> deleted_methods;
 		deleted_methods.resize(methods.size());
 
-		const MethodKey *k = NULL;
+		const MethodKey *k = nullptr;
 		while ((k = methods.next(k))) {
 			GDMonoMethod *method = methods.get(*k);
 
diff --git a/modules/mono/mono_gd/gd_mono_field.cpp b/modules/mono/mono_gd/gd_mono_field.cpp
index 11942c47d9..3f4e5fe5ac 100644
--- a/modules/mono/mono_gd/gd_mono_field.cpp
+++ b/modules/mono/mono_gd/gd_mono_field.cpp
@@ -116,7 +116,7 @@ void GDMonoField::set_value_from_variant(MonoObject *p_object, const Variant &p_
 		case MONO_TYPE_STRING: {
 			if (p_value.get_type() == Variant::NIL) {
 				// Otherwise, Variant -> String would return the string "Null"
-				MonoString *mono_string = NULL;
+				MonoString *mono_string = nullptr;
 				mono_field_set_value(p_object, mono_field, mono_string);
 			} else {
 				MonoString *mono_string = GDMonoMarshal::mono_string_from_godot(p_value);
@@ -623,19 +623,19 @@ bool GDMonoField::has_attribute(GDMonoClass *p_attr_class) {
 }
 
 MonoObject *GDMonoField::get_attribute(GDMonoClass *p_attr_class) {
-	ERR_FAIL_NULL_V(p_attr_class, NULL);
+	ERR_FAIL_NULL_V(p_attr_class, nullptr);
 
 	if (!attrs_fetched)
 		fetch_attributes();
 
 	if (!attributes)
-		return NULL;
+		return nullptr;
 
 	return mono_custom_attrs_get_attr(attributes, p_attr_class->get_mono_ptr());
 }
 
 void GDMonoField::fetch_attributes() {
-	ERR_FAIL_COND(attributes != NULL);
+	ERR_FAIL_COND(attributes != nullptr);
 	attributes = mono_custom_attrs_from_field(owner->get_mono_ptr(), mono_field);
 	attrs_fetched = true;
 }
@@ -671,7 +671,7 @@ GDMonoField::GDMonoField(MonoClassField *p_mono_field, GDMonoClass *p_owner) {
 	type.type_class = GDMono::get_singleton()->get_class(field_type_class);
 
 	attrs_fetched = false;
-	attributes = NULL;
+	attributes = nullptr;
 }
 
 GDMonoField::~GDMonoField() {
diff --git a/modules/mono/mono_gd/gd_mono_internals.cpp b/modules/mono/mono_gd/gd_mono_internals.cpp
index 53e642f317..1898785699 100644
--- a/modules/mono/mono_gd/gd_mono_internals.cpp
+++ b/modules/mono/mono_gd/gd_mono_internals.cpp
@@ -61,7 +61,7 @@ void tie_managed_to_unmanaged(MonoObject *managed, Object *unmanaged) {
 
 	GDMonoClass *native = GDMonoUtils::get_class_native_base(klass);
 
-	CRASH_COND(native == NULL);
+	CRASH_COND(native == nullptr);
 
 	if (native == klass) {
 		// If it's just a wrapper Godot class and not a custom inheriting class, then attach a
@@ -119,7 +119,7 @@ void unhandled_exception(MonoException *p_exc) {
 
 	if (GDMono::get_singleton()->get_unhandled_exception_policy() == GDMono::POLICY_TERMINATE_APP) {
 		// Too bad 'mono_invoke_unhandled_exception_hook' is not exposed to embedders
-		GDMono::unhandled_exception_hook((MonoObject *)p_exc, NULL);
+		GDMono::unhandled_exception_hook((MonoObject *)p_exc, nullptr);
 		GD_UNREACHABLE();
 	} else {
 #ifdef DEBUG_ENABLED
diff --git a/modules/mono/mono_gd/gd_mono_log.cpp b/modules/mono/mono_gd/gd_mono_log.cpp
index 4189934570..ca16c2b76a 100644
--- a/modules/mono/mono_gd/gd_mono_log.cpp
+++ b/modules/mono/mono_gd/gd_mono_log.cpp
@@ -46,13 +46,13 @@ static CharString get_default_log_level() {
 #endif
 }
 
-GDMonoLog *GDMonoLog::singleton = NULL;
+GDMonoLog *GDMonoLog::singleton = nullptr;
 
 #ifdef GD_MONO_LOG_ENABLED
 
 static int get_log_level_id(const char *p_log_level) {
 
-	const char *valid_log_levels[] = { "error", "critical", "warning", "message", "info", "debug", NULL };
+	const char *valid_log_levels[] = { "error", "critical", "warning", "message", "info", "debug", nullptr };
 
 	int i = 0;
 	while (valid_log_levels[i]) {
@@ -191,7 +191,7 @@ GDMonoLog::GDMonoLog() {
 
 GDMonoLog::~GDMonoLog() {
 
-	singleton = NULL;
+	singleton = nullptr;
 
 	if (log_file) {
 		log_file->close();
@@ -213,7 +213,7 @@ GDMonoLog::GDMonoLog() {
 
 GDMonoLog::~GDMonoLog() {
 
-	singleton = NULL;
+	singleton = nullptr;
 }
 
 #endif // !defined(JAVASCRIPT_ENABLED)
diff --git a/modules/mono/mono_gd/gd_mono_marshal.cpp b/modules/mono/mono_gd/gd_mono_marshal.cpp
index 0de5352752..1878038f44 100644
--- a/modules/mono/mono_gd/gd_mono_marshal.cpp
+++ b/modules/mono/mono_gd/gd_mono_marshal.cpp
@@ -410,7 +410,7 @@ MonoObject *variant_to_mono_object(const Variant *p_var, const ManagedType &p_ty
 
 		case MONO_TYPE_STRING: {
 			if (p_var->get_type() == Variant::NIL)
-				return NULL; // Otherwise, Variant -> String would return the string "Null"
+				return nullptr; // Otherwise, Variant -> String would return the string "Null"
 			return (MonoObject *)mono_string_from_godot(p_var->operator String());
 		} break;
 
@@ -537,7 +537,7 @@ MonoObject *variant_to_mono_object(const Variant *p_var, const ManagedType &p_ty
 						return BOX_ENUM(enum_baseclass, val);
 					}
 					default: {
-						ERR_FAIL_V_MSG(NULL, "Attempted to convert Variant to a managed enum value of unmarshallable base type.");
+						ERR_FAIL_V_MSG(nullptr, "Attempted to convert Variant to a managed enum value of unmarshallable base type.");
 					}
 				}
 			}
@@ -577,7 +577,7 @@ MonoObject *variant_to_mono_object(const Variant *p_var, const ManagedType &p_ty
 			if (array_type->eklass == CACHED_CLASS_RAW(Color))
 				return (MonoObject *)PackedColorArray_to_mono_array(p_var->operator PackedColorArray());
 
-			ERR_FAIL_V_MSG(NULL, "Attempted to convert Variant to a managed array of unmarshallable element type.");
+			ERR_FAIL_V_MSG(nullptr, "Attempted to convert Variant to a managed array of unmarshallable element type.");
 		} break;
 
 		case MONO_TYPE_CLASS: {
@@ -749,7 +749,7 @@ MonoObject *variant_to_mono_object(const Variant *p_var, const ManagedType &p_ty
 				case Variant::PACKED_COLOR_ARRAY:
 					return (MonoObject *)PackedColorArray_to_mono_array(p_var->operator PackedColorArray());
 				default:
-					return NULL;
+					return nullptr;
 			}
 			break;
 			case MONO_TYPE_GENERICINST: {
@@ -792,8 +792,8 @@ MonoObject *variant_to_mono_object(const Variant *p_var, const ManagedType &p_ty
 		} break;
 	}
 
-	ERR_FAIL_V_MSG(NULL, "Attempted to convert Variant to an unmarshallable managed type. Name: '" +
-								 p_type.type_class->get_name() + "' Encoding: " + itos(p_type.type_encoding) + ".");
+	ERR_FAIL_V_MSG(nullptr, "Attempted to convert Variant to an unmarshallable managed type. Name: '" +
+									p_type.type_class->get_name() + "' Encoding: " + itos(p_type.type_encoding) + ".");
 }
 
 Variant mono_object_to_variant_impl(MonoObject *p_obj, const ManagedType &p_type, bool p_fail_with_err = true) {
@@ -831,7 +831,7 @@ Variant mono_object_to_variant_impl(MonoObject *p_obj, const ManagedType &p_type
 			return unbox<double>(p_obj);
 
 		case MONO_TYPE_STRING: {
-			if (p_obj == NULL)
+			if (p_obj == nullptr)
 				return Variant(); // NIL
 			return mono_string_to_godot_not_null((MonoString *)p_obj);
 		} break;
@@ -935,7 +935,7 @@ Variant mono_object_to_variant_impl(MonoObject *p_obj, const ManagedType &p_type
 			// GodotObject
 			if (CACHED_CLASS(GodotObject)->is_assignable_from(type_class)) {
 				Object *ptr = unbox<Object *>(CACHED_FIELD(GodotObject, ptr)->get_value(p_obj));
-				if (ptr != NULL) {
+				if (ptr != nullptr) {
 					Reference *ref = Object::cast_to<Reference>(ptr);
 					return ref ? Variant(Ref<Reference>(ref)) : Variant(ptr);
 				}
@@ -958,14 +958,14 @@ Variant mono_object_to_variant_impl(MonoObject *p_obj, const ManagedType &p_type
 			}
 
 			if (CACHED_CLASS(Array) == type_class) {
-				MonoException *exc = NULL;
+				MonoException *exc = nullptr;
 				Array *ptr = CACHED_METHOD_THUNK(Array, GetPtr).invoke(p_obj, &exc);
 				UNHANDLED_EXCEPTION(exc);
 				return ptr ? Variant(*ptr) : Variant();
 			}
 
 			if (CACHED_CLASS(Dictionary) == type_class) {
-				MonoException *exc = NULL;
+				MonoException *exc = nullptr;
 				Dictionary *ptr = CACHED_METHOD_THUNK(Dictionary, GetPtr).invoke(p_obj, &exc);
 				UNHANDLED_EXCEPTION(exc);
 				return ptr ? Variant(*ptr) : Variant();
@@ -996,14 +996,14 @@ Variant mono_object_to_variant_impl(MonoObject *p_obj, const ManagedType &p_type
 			MonoReflectionType *reftype = mono_type_get_object(mono_domain_get(), p_type.type_class->get_mono_type());
 
 			if (GDMonoUtils::Marshal::type_is_generic_dictionary(reftype)) {
-				MonoException *exc = NULL;
+				MonoException *exc = nullptr;
 				MonoObject *ret = p_type.type_class->get_method("GetPtr")->invoke(p_obj, &exc);
 				UNHANDLED_EXCEPTION(exc);
 				return *unbox<Dictionary *>(ret);
 			}
 
 			if (GDMonoUtils::Marshal::type_is_generic_array(reftype)) {
-				MonoException *exc = NULL;
+				MonoException *exc = nullptr;
 				MonoObject *ret = p_type.type_class->get_method("GetPtr")->invoke(p_obj, &exc);
 				UNHANDLED_EXCEPTION(exc);
 				return *unbox<Array *>(ret);
@@ -1064,9 +1064,9 @@ String mono_object_to_variant_string(MonoObject *p_obj, MonoException **r_exc) {
 	ManagedType type = ManagedType::from_class(mono_object_get_class(p_obj));
 	Variant var = GDMonoMarshal::mono_object_to_variant_no_err(p_obj, type);
 
-	if (var.get_type() == Variant::NIL && p_obj != NULL) {
+	if (var.get_type() == Variant::NIL && p_obj != nullptr) {
 		// Cannot convert MonoObject* to Variant; fallback to 'ToString()'.
-		MonoException *exc = NULL;
+		MonoException *exc = nullptr;
 		MonoString *mono_str = GDMonoUtils::object_to_string(p_obj, &exc);
 
 		if (exc) {
@@ -1393,7 +1393,7 @@ Callable managed_to_callable(const M_Callable &p_managed_callable) {
 	} else {
 		Object *target = p_managed_callable.target ?
 								 unbox<Object *>(CACHED_FIELD(GodotObject, ptr)->get_value(p_managed_callable.target)) :
-								 NULL;
+								 nullptr;
 		StringName *method_ptr = unbox<StringName *>(CACHED_FIELD(StringName, ptr)->get_value(p_managed_callable.method_string_name));
 		StringName method = method_ptr ? *method_ptr : StringName();
 		return Callable(target, method);
@@ -1408,7 +1408,7 @@ M_Callable callable_to_managed(const Callable &p_callable) {
 		if (compare_equal_func == ManagedCallable::compare_equal_func_ptr) {
 			ManagedCallable *managed_callable = static_cast<ManagedCallable *>(custom);
 			return {
-				NULL, NULL,
+				nullptr, nullptr,
 				managed_callable->get_delegate()
 			};
 		} else if (compare_equal_func == SignalAwaiterCallable::compare_equal_func_ptr) {
@@ -1416,30 +1416,30 @@ M_Callable callable_to_managed(const Callable &p_callable) {
 			return {
 				GDMonoUtils::unmanaged_get_managed(ObjectDB::get_instance(signal_awaiter_callable->get_object())),
 				GDMonoUtils::create_managed_from(signal_awaiter_callable->get_signal()),
-				NULL
+				nullptr
 			};
 		} else if (compare_equal_func == EventSignalCallable::compare_equal_func_ptr) {
 			EventSignalCallable *event_signal_callable = static_cast<EventSignalCallable *>(custom);
 			return {
 				GDMonoUtils::unmanaged_get_managed(ObjectDB::get_instance(event_signal_callable->get_object())),
 				GDMonoUtils::create_managed_from(event_signal_callable->get_signal()),
-				NULL
+				nullptr
 			};
 		}
 
 		// Some other CallableCustom. We only support ManagedCallable.
-		return { NULL, NULL, NULL };
+		return { nullptr, nullptr, nullptr };
 	} else {
 		MonoObject *target_managed = GDMonoUtils::unmanaged_get_managed(p_callable.get_object());
 		MonoObject *method_string_name_managed = GDMonoUtils::create_managed_from(p_callable.get_method());
-		return { target_managed, method_string_name_managed, NULL };
+		return { target_managed, method_string_name_managed, nullptr };
 	}
 }
 
 Signal managed_to_signal_info(const M_SignalInfo &p_managed_signal) {
 	Object *owner = p_managed_signal.owner ?
 							unbox<Object *>(CACHED_FIELD(GodotObject, ptr)->get_value(p_managed_signal.owner)) :
-							NULL;
+							nullptr;
 	StringName *name_ptr = unbox<StringName *>(CACHED_FIELD(StringName, ptr)->get_value(p_managed_signal.name_string_name));
 	StringName name = name_ptr ? *name_ptr : StringName();
 	return Signal(owner, name);
diff --git a/modules/mono/mono_gd/gd_mono_marshal.h b/modules/mono/mono_gd/gd_mono_marshal.h
index 7d09f46b00..8b405291a7 100644
--- a/modules/mono/mono_gd/gd_mono_marshal.h
+++ b/modules/mono/mono_gd/gd_mono_marshal.h
@@ -63,7 +63,7 @@ T *unbox_addr(MonoObject *p_obj) {
 #define BOX_PTR(x) mono_value_box(mono_domain_get(), CACHED_CLASS_RAW(IntPtr), x)
 #define BOX_ENUM(m_enum_class, x) mono_value_box(mono_domain_get(), m_enum_class, &x)
 
-Variant::Type managed_to_variant_type(const ManagedType &p_type, bool *r_nil_is_variant = NULL);
+Variant::Type managed_to_variant_type(const ManagedType &p_type, bool *r_nil_is_variant = nullptr);
 
 bool try_get_array_element_type(const ManagedType &p_array_type, ManagedType &r_elem_type);
 bool try_get_dictionary_key_value_types(const ManagedType &p_dictionary_type, ManagedType &r_key_type, ManagedType &r_value_type);
@@ -81,7 +81,7 @@ _FORCE_INLINE_ String mono_string_to_godot_not_null(MonoString *p_mono_string) {
 }
 
 _FORCE_INLINE_ String mono_string_to_godot(MonoString *p_mono_string) {
-	if (p_mono_string == NULL)
+	if (p_mono_string == nullptr)
 		return String();
 
 	return mono_string_to_godot_not_null(p_mono_string);
diff --git a/modules/mono/mono_gd/gd_mono_method.cpp b/modules/mono/mono_gd/gd_mono_method.cpp
index e6a1ec2697..c8cc5247c6 100644
--- a/modules/mono/mono_gd/gd_mono_method.cpp
+++ b/modules/mono/mono_gd/gd_mono_method.cpp
@@ -58,9 +58,9 @@ void GDMonoMethod::_update_signature(MonoMethodSignature *p_method_sig) {
 		}
 	}
 
-	void *iter = NULL;
+	void *iter = nullptr;
 	MonoType *param_raw_type;
-	while ((param_raw_type = mono_signature_get_params(p_method_sig, &iter)) != NULL) {
+	while ((param_raw_type = mono_signature_get_params(p_method_sig, &iter)) != nullptr) {
 		ManagedType param_type;
 
 		param_type.type_encoding = mono_type_get_type(param_raw_type);
@@ -81,11 +81,11 @@ GDMonoClass *GDMonoMethod::get_enclosing_class() const {
 }
 
 bool GDMonoMethod::is_static() {
-	return mono_method_get_flags(mono_method, NULL) & MONO_METHOD_ATTR_STATIC;
+	return mono_method_get_flags(mono_method, nullptr) & MONO_METHOD_ATTR_STATIC;
 }
 
 IMonoClassMember::Visibility GDMonoMethod::get_visibility() {
-	switch (mono_method_get_flags(mono_method, NULL) & MONO_METHOD_ATTR_ACCESS_MASK) {
+	switch (mono_method_get_flags(mono_method, nullptr) & MONO_METHOD_ATTR_ACCESS_MASK) {
 		case MONO_METHOD_ATTR_PRIVATE:
 			return IMonoClassMember::PRIVATE;
 		case MONO_METHOD_ATTR_FAM_AND_ASSEM:
@@ -102,7 +102,7 @@ IMonoClassMember::Visibility GDMonoMethod::get_visibility() {
 }
 
 MonoObject *GDMonoMethod::invoke(MonoObject *p_object, const Variant **p_params, MonoException **r_exc) const {
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	MonoObject *ret;
 
 	if (params_count > 0) {
@@ -115,11 +115,11 @@ MonoObject *GDMonoMethod::invoke(MonoObject *p_object, const Variant **p_params,
 
 		ret = GDMonoUtils::runtime_invoke_array(mono_method, p_object, params, &exc);
 	} else {
-		ret = GDMonoUtils::runtime_invoke(mono_method, p_object, NULL, &exc);
+		ret = GDMonoUtils::runtime_invoke(mono_method, p_object, nullptr, &exc);
 	}
 
 	if (exc) {
-		ret = NULL;
+		ret = nullptr;
 		if (r_exc) {
 			*r_exc = exc;
 		} else {
@@ -131,16 +131,16 @@ MonoObject *GDMonoMethod::invoke(MonoObject *p_object, const Variant **p_params,
 }
 
 MonoObject *GDMonoMethod::invoke(MonoObject *p_object, MonoException **r_exc) const {
-	ERR_FAIL_COND_V(get_parameters_count() > 0, NULL);
-	return invoke_raw(p_object, NULL, r_exc);
+	ERR_FAIL_COND_V(get_parameters_count() > 0, nullptr);
+	return invoke_raw(p_object, nullptr, r_exc);
 }
 
 MonoObject *GDMonoMethod::invoke_raw(MonoObject *p_object, void **p_params, MonoException **r_exc) const {
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	MonoObject *ret = GDMonoUtils::runtime_invoke(mono_method, p_object, p_params, &exc);
 
 	if (exc) {
-		ret = NULL;
+		ret = nullptr;
 		if (r_exc) {
 			*r_exc = exc;
 		} else {
@@ -164,19 +164,19 @@ bool GDMonoMethod::has_attribute(GDMonoClass *p_attr_class) {
 }
 
 MonoObject *GDMonoMethod::get_attribute(GDMonoClass *p_attr_class) {
-	ERR_FAIL_NULL_V(p_attr_class, NULL);
+	ERR_FAIL_NULL_V(p_attr_class, nullptr);
 
 	if (!attrs_fetched)
 		fetch_attributes();
 
 	if (!attributes)
-		return NULL;
+		return nullptr;
 
 	return mono_custom_attrs_get_attr(attributes, p_attr_class->get_mono_ptr());
 }
 
 void GDMonoMethod::fetch_attributes() {
-	ERR_FAIL_COND(attributes != NULL);
+	ERR_FAIL_COND(attributes != nullptr);
 	attributes = mono_custom_attrs_from_method(mono_method);
 	attrs_fetched = true;
 }
@@ -281,7 +281,7 @@ GDMonoMethod::GDMonoMethod(StringName p_name, MonoMethod *p_method) {
 	method_info_fetched = false;
 
 	attrs_fetched = false;
-	attributes = NULL;
+	attributes = nullptr;
 
 	_update_signature();
 }
diff --git a/modules/mono/mono_gd/gd_mono_method.h b/modules/mono/mono_gd/gd_mono_method.h
index d4379f41fe..54b2eba3e8 100644
--- a/modules/mono/mono_gd/gd_mono_method.h
+++ b/modules/mono/mono_gd/gd_mono_method.h
@@ -76,9 +76,9 @@ public:
 	_FORCE_INLINE_ int get_parameters_count() const { return params_count; }
 	_FORCE_INLINE_ ManagedType get_return_type() const { return return_type; }
 
-	MonoObject *invoke(MonoObject *p_object, const Variant **p_params, MonoException **r_exc = NULL) const;
-	MonoObject *invoke(MonoObject *p_object, MonoException **r_exc = NULL) const;
-	MonoObject *invoke_raw(MonoObject *p_object, void **p_params, MonoException **r_exc = NULL) const;
+	MonoObject *invoke(MonoObject *p_object, const Variant **p_params, MonoException **r_exc = nullptr) const;
+	MonoObject *invoke(MonoObject *p_object, MonoException **r_exc = nullptr) const;
+	MonoObject *invoke_raw(MonoObject *p_object, void **p_params, MonoException **r_exc = nullptr) const;
 
 	String get_full_name(bool p_signature = false) const;
 	String get_full_name_no_class() const;
diff --git a/modules/mono/mono_gd/gd_mono_method_thunk.h b/modules/mono/mono_gd/gd_mono_method_thunk.h
index 614ae30947..0e05e974e9 100644
--- a/modules/mono/mono_gd/gd_mono_method_thunk.h
+++ b/modules/mono/mono_gd/gd_mono_method_thunk.h
@@ -60,16 +60,16 @@ public:
 	}
 
 	_FORCE_INLINE_ bool is_null() {
-		return mono_method_thunk == NULL;
+		return mono_method_thunk == nullptr;
 	}
 
 	_FORCE_INLINE_ void nullify() {
-		mono_method_thunk = NULL;
+		mono_method_thunk = nullptr;
 	}
 
 	_FORCE_INLINE_ void set_from_method(GDMonoMethod *p_mono_method) {
 #ifdef DEBUG_ENABLED
-		CRASH_COND(p_mono_method == NULL);
+		CRASH_COND(p_mono_method == nullptr);
 		CRASH_COND(p_mono_method->get_return_type().type_encoding != MONO_TYPE_VOID);
 
 		if (p_mono_method->is_static()) {
@@ -82,7 +82,7 @@ public:
 	}
 
 	GDMonoMethodThunk() :
-			mono_method_thunk(NULL) {
+			mono_method_thunk(nullptr) {
 	}
 
 	explicit GDMonoMethodThunk(GDMonoMethod *p_mono_method) {
@@ -106,16 +106,16 @@ public:
 	}
 
 	_FORCE_INLINE_ bool is_null() {
-		return mono_method_thunk == NULL;
+		return mono_method_thunk == nullptr;
 	}
 
 	_FORCE_INLINE_ void nullify() {
-		mono_method_thunk = NULL;
+		mono_method_thunk = nullptr;
 	}
 
 	_FORCE_INLINE_ void set_from_method(GDMonoMethod *p_mono_method) {
 #ifdef DEBUG_ENABLED
-		CRASH_COND(p_mono_method == NULL);
+		CRASH_COND(p_mono_method == nullptr);
 		CRASH_COND(p_mono_method->get_return_type().type_encoding == MONO_TYPE_VOID);
 
 		if (p_mono_method->is_static()) {
@@ -128,12 +128,12 @@ public:
 	}
 
 	GDMonoMethodThunkR() :
-			mono_method_thunk(NULL) {
+			mono_method_thunk(nullptr) {
 	}
 
 	explicit GDMonoMethodThunkR(GDMonoMethod *p_mono_method) {
 #ifdef DEBUG_ENABLED
-		CRASH_COND(p_mono_method == NULL);
+		CRASH_COND(p_mono_method == nullptr);
 #endif
 		mono_method_thunk = (M)mono_method_get_unmanaged_thunk(p_mono_method->get_mono_ptr());
 	}
@@ -146,7 +146,7 @@ struct VariadicInvokeMonoMethodImpl {
 	static void invoke(GDMonoMethod *p_mono_method, P1 p_arg1, ParamTypes... p_args, MonoException **r_exc) {
 		if (p_mono_method->is_static()) {
 			void *args[ThunkParamCount] = { p_arg1, p_args... };
-			p_mono_method->invoke_raw(NULL, args, r_exc);
+			p_mono_method->invoke_raw(nullptr, args, r_exc);
 		} else {
 			void *args[ThunkParamCount] = { p_args... };
 			p_mono_method->invoke_raw((MonoObject *)p_arg1, args, r_exc);
@@ -167,7 +167,7 @@ struct VariadicInvokeMonoMethod<0> {
 #ifdef DEBUG_ENABLED
 		CRASH_COND(!p_mono_method->is_static());
 #endif
-		p_mono_method->invoke_raw(NULL, NULL, r_exc);
+		p_mono_method->invoke_raw(nullptr, nullptr, r_exc);
 	}
 };
 
@@ -176,9 +176,9 @@ struct VariadicInvokeMonoMethod<1, P1> {
 	static void invoke(GDMonoMethod *p_mono_method, P1 p_arg1, MonoException **r_exc) {
 		if (p_mono_method->is_static()) {
 			void *args[1] = { p_arg1 };
-			p_mono_method->invoke_raw(NULL, args, r_exc);
+			p_mono_method->invoke_raw(nullptr, args, r_exc);
 		} else {
-			p_mono_method->invoke_raw((MonoObject *)p_arg1, NULL, r_exc);
+			p_mono_method->invoke_raw((MonoObject *)p_arg1, nullptr, r_exc);
 		}
 	}
 };
@@ -203,7 +203,7 @@ struct VariadicInvokeMonoMethodRImpl {
 	static R invoke(GDMonoMethod *p_mono_method, P1 p_arg1, ParamTypes... p_args, MonoException **r_exc) {
 		if (p_mono_method->is_static()) {
 			void *args[ThunkParamCount] = { p_arg1, p_args... };
-			MonoObject *r = p_mono_method->invoke_raw(NULL, args, r_exc);
+			MonoObject *r = p_mono_method->invoke_raw(nullptr, args, r_exc);
 			return unbox_if_needed<R>(r, p_mono_method->get_return_type());
 		} else {
 			void *args[ThunkParamCount] = { p_args... };
@@ -226,7 +226,7 @@ struct VariadicInvokeMonoMethodR<0, R> {
 #ifdef DEBUG_ENABLED
 		CRASH_COND(!p_mono_method->is_static());
 #endif
-		MonoObject *r = p_mono_method->invoke_raw(NULL, NULL, r_exc);
+		MonoObject *r = p_mono_method->invoke_raw(nullptr, nullptr, r_exc);
 		return unbox_if_needed<R>(r, p_mono_method->get_return_type());
 	}
 };
@@ -236,10 +236,10 @@ struct VariadicInvokeMonoMethodR<1, R, P1> {
 	static R invoke(GDMonoMethod *p_mono_method, P1 p_arg1, MonoException **r_exc) {
 		if (p_mono_method->is_static()) {
 			void *args[1] = { p_arg1 };
-			MonoObject *r = p_mono_method->invoke_raw(NULL, args, r_exc);
+			MonoObject *r = p_mono_method->invoke_raw(nullptr, args, r_exc);
 			return unbox_if_needed<R>(r, p_mono_method->get_return_type());
 		} else {
-			MonoObject *r = p_mono_method->invoke_raw((MonoObject *)p_arg1, NULL, r_exc);
+			MonoObject *r = p_mono_method->invoke_raw((MonoObject *)p_arg1, nullptr, r_exc);
 			return unbox_if_needed<R>(r, p_mono_method->get_return_type());
 		}
 	}
@@ -256,16 +256,16 @@ public:
 	}
 
 	_FORCE_INLINE_ bool is_null() {
-		return mono_method == NULL;
+		return mono_method == nullptr;
 	}
 
 	_FORCE_INLINE_ void nullify() {
-		mono_method = NULL;
+		mono_method = nullptr;
 	}
 
 	_FORCE_INLINE_ void set_from_method(GDMonoMethod *p_mono_method) {
 #ifdef DEBUG_ENABLED
-		CRASH_COND(p_mono_method == NULL);
+		CRASH_COND(p_mono_method == nullptr);
 		CRASH_COND(p_mono_method->get_return_type().type_encoding != MONO_TYPE_VOID);
 
 		if (p_mono_method->is_static()) {
@@ -278,7 +278,7 @@ public:
 	}
 
 	GDMonoMethodThunk() :
-			mono_method(NULL) {
+			mono_method(nullptr) {
 	}
 
 	explicit GDMonoMethodThunk(GDMonoMethod *p_mono_method) {
@@ -297,16 +297,16 @@ public:
 	}
 
 	_FORCE_INLINE_ bool is_null() {
-		return mono_method == NULL;
+		return mono_method == nullptr;
 	}
 
 	_FORCE_INLINE_ void nullify() {
-		mono_method = NULL;
+		mono_method = nullptr;
 	}
 
 	_FORCE_INLINE_ void set_from_method(GDMonoMethod *p_mono_method) {
 #ifdef DEBUG_ENABLED
-		CRASH_COND(p_mono_method == NULL);
+		CRASH_COND(p_mono_method == nullptr);
 		CRASH_COND(p_mono_method->get_return_type().type_encoding == MONO_TYPE_VOID);
 
 		if (p_mono_method->is_static()) {
@@ -319,7 +319,7 @@ public:
 	}
 
 	GDMonoMethodThunkR() :
-			mono_method(NULL) {
+			mono_method(nullptr) {
 	}
 
 	explicit GDMonoMethodThunkR(GDMonoMethod *p_mono_method) {
diff --git a/modules/mono/mono_gd/gd_mono_property.cpp b/modules/mono/mono_gd/gd_mono_property.cpp
index 3b5ce58d80..c3e7598f2d 100644
--- a/modules/mono/mono_gd/gd_mono_property.cpp
+++ b/modules/mono/mono_gd/gd_mono_property.cpp
@@ -57,7 +57,7 @@ GDMonoProperty::GDMonoProperty(MonoProperty *p_mono_property, GDMonoClass *p_own
 
 		MonoMethodSignature *setter_sig = mono_method_signature(prop_method);
 
-		void *iter = NULL;
+		void *iter = nullptr;
 		MonoType *param_raw_type = mono_signature_get_params(setter_sig, &iter);
 
 		type.type_encoding = mono_type_get_type(param_raw_type);
@@ -66,7 +66,7 @@ GDMonoProperty::GDMonoProperty(MonoProperty *p_mono_property, GDMonoClass *p_own
 	}
 
 	attrs_fetched = false;
-	attributes = NULL;
+	attributes = nullptr;
 }
 
 GDMonoProperty::~GDMonoProperty() {
@@ -77,17 +77,17 @@ GDMonoProperty::~GDMonoProperty() {
 
 bool GDMonoProperty::is_static() {
 	MonoMethod *prop_method = mono_property_get_get_method(mono_property);
-	if (prop_method == NULL)
+	if (prop_method == nullptr)
 		prop_method = mono_property_get_set_method(mono_property);
-	return mono_method_get_flags(prop_method, NULL) & MONO_METHOD_ATTR_STATIC;
+	return mono_method_get_flags(prop_method, nullptr) & MONO_METHOD_ATTR_STATIC;
 }
 
 IMonoClassMember::Visibility GDMonoProperty::get_visibility() {
 	MonoMethod *prop_method = mono_property_get_get_method(mono_property);
-	if (prop_method == NULL)
+	if (prop_method == nullptr)
 		prop_method = mono_property_get_set_method(mono_property);
 
-	switch (mono_method_get_flags(prop_method, NULL) & MONO_METHOD_ATTR_ACCESS_MASK) {
+	switch (mono_method_get_flags(prop_method, nullptr) & MONO_METHOD_ATTR_ACCESS_MASK) {
 		case MONO_METHOD_ATTR_PRIVATE:
 			return IMonoClassMember::PRIVATE;
 		case MONO_METHOD_ATTR_FAM_AND_ASSEM:
@@ -116,36 +116,36 @@ bool GDMonoProperty::has_attribute(GDMonoClass *p_attr_class) {
 }
 
 MonoObject *GDMonoProperty::get_attribute(GDMonoClass *p_attr_class) {
-	ERR_FAIL_NULL_V(p_attr_class, NULL);
+	ERR_FAIL_NULL_V(p_attr_class, nullptr);
 
 	if (!attrs_fetched)
 		fetch_attributes();
 
 	if (!attributes)
-		return NULL;
+		return nullptr;
 
 	return mono_custom_attrs_get_attr(attributes, p_attr_class->get_mono_ptr());
 }
 
 void GDMonoProperty::fetch_attributes() {
-	ERR_FAIL_COND(attributes != NULL);
+	ERR_FAIL_COND(attributes != nullptr);
 	attributes = mono_custom_attrs_from_property(owner->get_mono_ptr(), mono_property);
 	attrs_fetched = true;
 }
 
 bool GDMonoProperty::has_getter() {
-	return mono_property_get_get_method(mono_property) != NULL;
+	return mono_property_get_get_method(mono_property) != nullptr;
 }
 
 bool GDMonoProperty::has_setter() {
-	return mono_property_get_set_method(mono_property) != NULL;
+	return mono_property_get_set_method(mono_property) != nullptr;
 }
 
 void GDMonoProperty::set_value(MonoObject *p_object, MonoObject *p_value, MonoException **r_exc) {
 	MonoMethod *prop_method = mono_property_get_set_method(mono_property);
 	MonoArray *params = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(MonoObject), 1);
 	mono_array_setref(params, 0, p_value);
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	GDMonoUtils::runtime_invoke_array(prop_method, p_object, params, &exc);
 	if (exc) {
 		if (r_exc) {
@@ -157,7 +157,7 @@ void GDMonoProperty::set_value(MonoObject *p_object, MonoObject *p_value, MonoEx
 }
 
 void GDMonoProperty::set_value(MonoObject *p_object, void **p_params, MonoException **r_exc) {
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	GDMonoUtils::property_set_value(mono_property, p_object, p_params, &exc);
 
 	if (exc) {
@@ -170,11 +170,11 @@ void GDMonoProperty::set_value(MonoObject *p_object, void **p_params, MonoExcept
 }
 
 MonoObject *GDMonoProperty::get_value(MonoObject *p_object, MonoException **r_exc) {
-	MonoException *exc = NULL;
-	MonoObject *ret = GDMonoUtils::property_get_value(mono_property, p_object, NULL, &exc);
+	MonoException *exc = nullptr;
+	MonoObject *ret = GDMonoUtils::property_get_value(mono_property, p_object, nullptr, &exc);
 
 	if (exc) {
-		ret = NULL;
+		ret = nullptr;
 		if (r_exc) {
 			*r_exc = exc;
 		} else {
diff --git a/modules/mono/mono_gd/gd_mono_property.h b/modules/mono/mono_gd/gd_mono_property.h
index 2aec64f565..4653758a86 100644
--- a/modules/mono/mono_gd/gd_mono_property.h
+++ b/modules/mono/mono_gd/gd_mono_property.h
@@ -65,9 +65,9 @@ public:
 
 	_FORCE_INLINE_ ManagedType get_type() const { return type; }
 
-	void set_value(MonoObject *p_object, MonoObject *p_value, MonoException **r_exc = NULL);
-	void set_value(MonoObject *p_object, void **p_params, MonoException **r_exc = NULL);
-	MonoObject *get_value(MonoObject *p_object, MonoException **r_exc = NULL);
+	void set_value(MonoObject *p_object, MonoObject *p_value, MonoException **r_exc = nullptr);
+	void set_value(MonoObject *p_object, void **p_params, MonoException **r_exc = nullptr);
+	MonoObject *get_value(MonoObject *p_object, MonoException **r_exc = nullptr);
 
 	bool get_bool_value(MonoObject *p_object);
 	int get_int_value(MonoObject *p_object);
diff --git a/modules/mono/mono_gd/gd_mono_utils.cpp b/modules/mono/mono_gd/gd_mono_utils.cpp
index 5a2bdffe54..00119ced88 100644
--- a/modules/mono/mono_gd/gd_mono_utils.cpp
+++ b/modules/mono/mono_gd/gd_mono_utils.cpp
@@ -57,7 +57,7 @@ namespace GDMonoUtils {
 MonoObject *unmanaged_get_managed(Object *unmanaged) {
 
 	if (!unmanaged)
-		return NULL;
+		return nullptr;
 
 	if (unmanaged->get_script_instance()) {
 		CSharpInstance *cs_instance = CAST_CSHARP_INSTANCE(unmanaged->get_script_instance());
@@ -71,7 +71,7 @@ MonoObject *unmanaged_get_managed(Object *unmanaged) {
 
 	void *data = unmanaged->get_script_instance_binding(CSharpLanguage::get_singleton()->get_language_index());
 
-	ERR_FAIL_NULL_V(data, NULL);
+	ERR_FAIL_NULL_V(data, nullptr);
 
 	CSharpScriptBinding &script_binding = ((Map<Object *, CSharpScriptBinding>::Element *)data)->value();
 
@@ -82,7 +82,7 @@ MonoObject *unmanaged_get_managed(Object *unmanaged) {
 			// Already had a binding that needs to be setup
 			CSharpLanguage::get_singleton()->setup_csharp_script_binding(script_binding, unmanaged);
 
-			ERR_FAIL_COND_V(!script_binding.inited, NULL);
+			ERR_FAIL_COND_V(!script_binding.inited, nullptr);
 		}
 	}
 
@@ -99,11 +99,11 @@ MonoObject *unmanaged_get_managed(Object *unmanaged) {
 
 #ifdef DEBUG_ENABLED
 	CRASH_COND(script_binding.type_name == StringName());
-	CRASH_COND(script_binding.wrapper_class == NULL);
+	CRASH_COND(script_binding.wrapper_class == nullptr);
 #endif
 
 	MonoObject *mono_object = GDMonoUtils::create_managed_for_godot_object(script_binding.wrapper_class, script_binding.type_name, unmanaged);
-	ERR_FAIL_NULL_V(mono_object, NULL);
+	ERR_FAIL_NULL_V(mono_object, nullptr);
 
 	gchandle = MonoGCHandleData::new_strong_handle(mono_object);
 
@@ -127,7 +127,7 @@ void set_main_thread(MonoThread *p_thread) {
 }
 
 MonoThread *attach_current_thread() {
-	ERR_FAIL_COND_V(!GDMono::get_singleton()->is_runtime_initialized(), NULL);
+	ERR_FAIL_COND_V(!GDMono::get_singleton()->is_runtime_initialized(), nullptr);
 	MonoDomain *scripts_domain = GDMono::get_singleton()->get_scripts_domain();
 #ifndef GD_MONO_SINGLE_APPDOMAIN
 	MonoThread *mono_thread = mono_thread_attach(scripts_domain ? scripts_domain : mono_get_root_domain());
@@ -135,7 +135,7 @@ MonoThread *attach_current_thread() {
 	// The scripts domain is the root domain
 	MonoThread *mono_thread = mono_thread_attach(scripts_domain);
 #endif
-	ERR_FAIL_NULL_V(mono_thread, NULL);
+	ERR_FAIL_NULL_V(mono_thread, nullptr);
 	return mono_thread;
 }
 
@@ -157,7 +157,7 @@ MonoThread *get_current_thread() {
 }
 
 bool is_thread_attached() {
-	return mono_domain_get() != NULL;
+	return mono_domain_get() != nullptr;
 }
 
 uint32_t new_strong_gchandle(MonoObject *p_object) {
@@ -179,11 +179,11 @@ void free_gchandle(uint32_t p_gchandle) {
 void runtime_object_init(MonoObject *p_this_obj, GDMonoClass *p_class, MonoException **r_exc) {
 	GDMonoMethod *ctor = p_class->get_method(".ctor", 0);
 	ERR_FAIL_NULL(ctor);
-	ctor->invoke_raw(p_this_obj, NULL, r_exc);
+	ctor->invoke_raw(p_this_obj, nullptr, r_exc);
 }
 
 bool mono_delegate_equal(MonoDelegate *p_a, MonoDelegate *p_b) {
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	MonoBoolean res = CACHED_METHOD_THUNK(Delegate, Equals).invoke((MonoObject *)p_a, (MonoObject *)p_b, &exc);
 	UNHANDLED_EXCEPTION(exc);
 	return (bool)res;
@@ -226,18 +226,18 @@ GDMonoClass *get_class_native_base(GDMonoClass *p_class) {
 		if (assembly == GDMono::get_singleton()->get_editor_api_assembly())
 			return klass;
 #endif
-	} while ((klass = klass->get_parent_class()) != NULL);
+	} while ((klass = klass->get_parent_class()) != nullptr);
 
-	return NULL;
+	return nullptr;
 }
 
 MonoObject *create_managed_for_godot_object(GDMonoClass *p_class, const StringName &p_native, Object *p_object) {
 	bool parent_is_object_class = ClassDB::is_parent_class(p_object->get_class_name(), p_native);
-	ERR_FAIL_COND_V_MSG(!parent_is_object_class, NULL,
+	ERR_FAIL_COND_V_MSG(!parent_is_object_class, nullptr,
 			"Type inherits from native type '" + p_native + "', so it can't be instanced in object of type: '" + p_object->get_class() + "'.");
 
 	MonoObject *mono_object = mono_object_new(mono_domain_get(), p_class->get_mono_ptr());
-	ERR_FAIL_NULL_V(mono_object, NULL);
+	ERR_FAIL_NULL_V(mono_object, nullptr);
 
 	CACHED_FIELD(GodotObject, ptr)->set_value_raw(mono_object, p_object);
 
@@ -249,7 +249,7 @@ MonoObject *create_managed_for_godot_object(GDMonoClass *p_class, const StringNa
 
 MonoObject *create_managed_from(const StringName &p_from) {
 	MonoObject *mono_object = mono_object_new(mono_domain_get(), CACHED_CLASS_RAW(StringName));
-	ERR_FAIL_NULL_V(mono_object, NULL);
+	ERR_FAIL_NULL_V(mono_object, nullptr);
 
 	// Construct
 	GDMonoUtils::runtime_object_init(mono_object, CACHED_CLASS(StringName));
@@ -261,7 +261,7 @@ MonoObject *create_managed_from(const StringName &p_from) {
 
 MonoObject *create_managed_from(const NodePath &p_from) {
 	MonoObject *mono_object = mono_object_new(mono_domain_get(), CACHED_CLASS_RAW(NodePath));
-	ERR_FAIL_NULL_V(mono_object, NULL);
+	ERR_FAIL_NULL_V(mono_object, nullptr);
 
 	// Construct
 	GDMonoUtils::runtime_object_init(mono_object, CACHED_CLASS(NodePath));
@@ -273,7 +273,7 @@ MonoObject *create_managed_from(const NodePath &p_from) {
 
 MonoObject *create_managed_from(const RID &p_from) {
 	MonoObject *mono_object = mono_object_new(mono_domain_get(), CACHED_CLASS_RAW(RID));
-	ERR_FAIL_NULL_V(mono_object, NULL);
+	ERR_FAIL_NULL_V(mono_object, nullptr);
 
 	// Construct
 	GDMonoUtils::runtime_object_init(mono_object, CACHED_CLASS(RID));
@@ -285,15 +285,15 @@ MonoObject *create_managed_from(const RID &p_from) {
 
 MonoObject *create_managed_from(const Array &p_from, GDMonoClass *p_class) {
 	MonoObject *mono_object = mono_object_new(mono_domain_get(), p_class->get_mono_ptr());
-	ERR_FAIL_NULL_V(mono_object, NULL);
+	ERR_FAIL_NULL_V(mono_object, nullptr);
 
 	// Search constructor that takes a pointer as parameter
 	MonoMethod *m;
-	void *iter = NULL;
+	void *iter = nullptr;
 	while ((m = mono_class_get_methods(p_class->get_mono_ptr(), &iter))) {
 		if (strcmp(mono_method_get_name(m), ".ctor") == 0) {
 			MonoMethodSignature *sig = mono_method_signature(m);
-			void *front = NULL;
+			void *front = nullptr;
 			if (mono_signature_get_param_count(sig) == 1 &&
 					mono_class_from_mono_type(mono_signature_get_params(sig, &front)) == CACHED_CLASS(IntPtr)->get_mono_ptr()) {
 				break;
@@ -301,12 +301,12 @@ MonoObject *create_managed_from(const Array &p_from, GDMonoClass *p_class) {
 		}
 	}
 
-	CRASH_COND(m == NULL);
+	CRASH_COND(m == nullptr);
 
 	Array *new_array = memnew(Array(p_from));
 	void *args[1] = { &new_array };
 
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	GDMonoUtils::runtime_invoke(m, mono_object, args, &exc);
 	UNHANDLED_EXCEPTION(exc);
 
@@ -315,15 +315,15 @@ MonoObject *create_managed_from(const Array &p_from, GDMonoClass *p_class) {
 
 MonoObject *create_managed_from(const Dictionary &p_from, GDMonoClass *p_class) {
 	MonoObject *mono_object = mono_object_new(mono_domain_get(), p_class->get_mono_ptr());
-	ERR_FAIL_NULL_V(mono_object, NULL);
+	ERR_FAIL_NULL_V(mono_object, nullptr);
 
 	// Search constructor that takes a pointer as parameter
 	MonoMethod *m;
-	void *iter = NULL;
+	void *iter = nullptr;
 	while ((m = mono_class_get_methods(p_class->get_mono_ptr(), &iter))) {
 		if (strcmp(mono_method_get_name(m), ".ctor") == 0) {
 			MonoMethodSignature *sig = mono_method_signature(m);
-			void *front = NULL;
+			void *front = nullptr;
 			if (mono_signature_get_param_count(sig) == 1 &&
 					mono_class_from_mono_type(mono_signature_get_params(sig, &front)) == CACHED_CLASS(IntPtr)->get_mono_ptr()) {
 				break;
@@ -331,12 +331,12 @@ MonoObject *create_managed_from(const Dictionary &p_from, GDMonoClass *p_class)
 		}
 	}
 
-	CRASH_COND(m == NULL);
+	CRASH_COND(m == nullptr);
 
 	Dictionary *new_dict = memnew(Dictionary(p_from));
 	void *args[1] = { &new_dict };
 
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	GDMonoUtils::runtime_invoke(m, mono_object, args, &exc);
 	UNHANDLED_EXCEPTION(exc);
 
@@ -346,7 +346,7 @@ MonoObject *create_managed_from(const Dictionary &p_from, GDMonoClass *p_class)
 MonoDomain *create_domain(const String &p_friendly_name) {
 	print_verbose("Mono: Creating domain '" + p_friendly_name + "'...");
 
-	MonoDomain *domain = mono_domain_create_appdomain((char *)p_friendly_name.utf8().get_data(), NULL);
+	MonoDomain *domain = mono_domain_create_appdomain((char *)p_friendly_name.utf8().get_data(), nullptr);
 
 	if (domain) {
 		// Workaround to avoid this exception:
@@ -371,7 +371,7 @@ String get_exception_name_and_message(MonoException *p_exc) {
 	res += ": ";
 
 	MonoProperty *prop = mono_class_get_property_from_name(klass, "Message");
-	MonoString *msg = (MonoString *)property_get_value(prop, (MonoObject *)p_exc, NULL, NULL);
+	MonoString *msg = (MonoString *)property_get_value(prop, (MonoObject *)p_exc, nullptr, nullptr);
 	res += GDMonoMarshal::mono_string_to_godot(msg);
 
 	return res;
@@ -382,7 +382,7 @@ void set_exception_message(MonoException *p_exc, String message) {
 	MonoProperty *prop = mono_class_get_property_from_name(klass, "Message");
 	MonoString *msg = GDMonoMarshal::mono_string_from_godot(message);
 	void *params[1] = { msg };
-	property_set_value(prop, (MonoObject *)p_exc, params, NULL);
+	property_set_value(prop, (MonoObject *)p_exc, params, nullptr);
 }
 
 void debug_print_unhandled_exception(MonoException *p_exc) {
@@ -415,14 +415,14 @@ void debug_send_unhandled_exception_error(MonoException *p_exc) {
 	Vector<ScriptLanguage::StackInfo> si;
 	String exc_msg;
 
-	while (p_exc != NULL) {
+	while (p_exc != nullptr) {
 		GDMonoClass *st_klass = CACHED_CLASS(System_Diagnostics_StackTrace);
 		MonoObject *stack_trace = mono_object_new(mono_domain_get(), st_klass->get_mono_ptr());
 
 		MonoBoolean need_file_info = true;
 		void *ctor_args[2] = { p_exc, &need_file_info };
 
-		MonoException *unexpected_exc = NULL;
+		MonoException *unexpected_exc = nullptr;
 		CACHED_METHOD(System_Diagnostics_StackTrace, ctor_Exception_bool)->invoke_raw(stack_trace, ctor_args, &unexpected_exc);
 
 		if (unexpected_exc) {
@@ -431,7 +431,7 @@ void debug_send_unhandled_exception_error(MonoException *p_exc) {
 		}
 
 		Vector<ScriptLanguage::StackInfo> _si;
-		if (stack_trace != NULL) {
+		if (stack_trace != nullptr) {
 			_si = CSharpLanguage::get_singleton()->stack_trace_get_info(stack_trace);
 			for (int i = _si.size() - 1; i >= 0; i--)
 				si.insert(0, _si[i]);
@@ -441,10 +441,10 @@ void debug_send_unhandled_exception_error(MonoException *p_exc) {
 
 		GDMonoClass *exc_class = GDMono::get_singleton()->get_class(mono_get_exception_class());
 		GDMonoProperty *inner_exc_prop = exc_class->get_property("InnerException");
-		CRASH_COND(inner_exc_prop == NULL);
+		CRASH_COND(inner_exc_prop == nullptr);
 
 		MonoObject *inner_exc = inner_exc_prop->get_value((MonoObject *)p_exc);
-		if (inner_exc != NULL)
+		if (inner_exc != nullptr)
 			si.insert(0, separator);
 
 		p_exc = (MonoException *)inner_exc;
@@ -570,7 +570,7 @@ namespace Marshal {
 
 bool type_is_generic_array(MonoReflectionType *p_reftype) {
 	NO_GLUE_RET(false);
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	MonoBoolean res = CACHED_METHOD_THUNK(MarshalUtils, TypeIsGenericArray).invoke(p_reftype, &exc);
 	UNHANDLED_EXCEPTION(exc);
 	return (bool)res;
@@ -578,27 +578,27 @@ bool type_is_generic_array(MonoReflectionType *p_reftype) {
 
 bool type_is_generic_dictionary(MonoReflectionType *p_reftype) {
 	NO_GLUE_RET(false);
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	MonoBoolean res = CACHED_METHOD_THUNK(MarshalUtils, TypeIsGenericDictionary).invoke(p_reftype, &exc);
 	UNHANDLED_EXCEPTION(exc);
 	return (bool)res;
 }
 
 void array_get_element_type(MonoReflectionType *p_array_reftype, MonoReflectionType **r_elem_reftype) {
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	CACHED_METHOD_THUNK(MarshalUtils, ArrayGetElementType).invoke(p_array_reftype, r_elem_reftype, &exc);
 	UNHANDLED_EXCEPTION(exc);
 }
 
 void dictionary_get_key_value_types(MonoReflectionType *p_dict_reftype, MonoReflectionType **r_key_reftype, MonoReflectionType **r_value_reftype) {
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	CACHED_METHOD_THUNK(MarshalUtils, DictionaryGetKeyValueTypes).invoke(p_dict_reftype, r_key_reftype, r_value_reftype, &exc);
 	UNHANDLED_EXCEPTION(exc);
 }
 
 bool generic_ienumerable_is_assignable_from(MonoReflectionType *p_reftype) {
 	NO_GLUE_RET(false);
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	MonoBoolean res = CACHED_METHOD_THUNK(MarshalUtils, GenericIEnumerableIsAssignableFromType).invoke(p_reftype, &exc);
 	UNHANDLED_EXCEPTION(exc);
 	return (bool)res;
@@ -606,7 +606,7 @@ bool generic_ienumerable_is_assignable_from(MonoReflectionType *p_reftype) {
 
 bool generic_idictionary_is_assignable_from(MonoReflectionType *p_reftype) {
 	NO_GLUE_RET(false);
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	MonoBoolean res = CACHED_METHOD_THUNK(MarshalUtils, GenericIDictionaryIsAssignableFromType).invoke(p_reftype, &exc);
 	UNHANDLED_EXCEPTION(exc);
 	return (bool)res;
@@ -614,7 +614,7 @@ bool generic_idictionary_is_assignable_from(MonoReflectionType *p_reftype) {
 
 bool generic_ienumerable_is_assignable_from(MonoReflectionType *p_reftype, MonoReflectionType **r_elem_reftype) {
 	NO_GLUE_RET(false);
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	MonoBoolean res = CACHED_METHOD_THUNK(MarshalUtils, GenericIEnumerableIsAssignableFromType_with_info).invoke(p_reftype, r_elem_reftype, &exc);
 	UNHANDLED_EXCEPTION(exc);
 	return (bool)res;
@@ -622,7 +622,7 @@ bool generic_ienumerable_is_assignable_from(MonoReflectionType *p_reftype, MonoR
 
 bool generic_idictionary_is_assignable_from(MonoReflectionType *p_reftype, MonoReflectionType **r_key_reftype, MonoReflectionType **r_value_reftype) {
 	NO_GLUE_RET(false);
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	MonoBoolean res = CACHED_METHOD_THUNK(MarshalUtils, GenericIDictionaryIsAssignableFromType_with_info).invoke(p_reftype, r_key_reftype, r_value_reftype, &exc);
 	UNHANDLED_EXCEPTION(exc);
 	return (bool)res;
@@ -631,7 +631,7 @@ bool generic_idictionary_is_assignable_from(MonoReflectionType *p_reftype, MonoR
 Array enumerable_to_array(MonoObject *p_enumerable) {
 	NO_GLUE_RET(Array());
 	Array result;
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	CACHED_METHOD_THUNK(MarshalUtils, EnumerableToArray).invoke(p_enumerable, &result, &exc);
 	UNHANDLED_EXCEPTION(exc);
 	return result;
@@ -640,7 +640,7 @@ Array enumerable_to_array(MonoObject *p_enumerable) {
 Dictionary idictionary_to_dictionary(MonoObject *p_idictionary) {
 	NO_GLUE_RET(Dictionary());
 	Dictionary result;
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	CACHED_METHOD_THUNK(MarshalUtils, IDictionaryToDictionary).invoke(p_idictionary, &result, &exc);
 	UNHANDLED_EXCEPTION(exc);
 	return result;
@@ -649,23 +649,23 @@ Dictionary idictionary_to_dictionary(MonoObject *p_idictionary) {
 Dictionary generic_idictionary_to_dictionary(MonoObject *p_generic_idictionary) {
 	NO_GLUE_RET(Dictionary());
 	Dictionary result;
-	MonoException *exc = NULL;
+	MonoException *exc = nullptr;
 	CACHED_METHOD_THUNK(MarshalUtils, GenericIDictionaryToDictionary).invoke(p_generic_idictionary, &result, &exc);
 	UNHANDLED_EXCEPTION(exc);
 	return result;
 }
 
 GDMonoClass *make_generic_array_type(MonoReflectionType *p_elem_reftype) {
-	NO_GLUE_RET(NULL);
-	MonoException *exc = NULL;
+	NO_GLUE_RET(nullptr);
+	MonoException *exc = nullptr;
 	MonoReflectionType *reftype = CACHED_METHOD_THUNK(MarshalUtils, MakeGenericArrayType).invoke(p_elem_reftype, &exc);
 	UNHANDLED_EXCEPTION(exc);
 	return GDMono::get_singleton()->get_class(mono_class_from_mono_type(mono_reflection_type_get_type(reftype)));
 }
 
 GDMonoClass *make_generic_dictionary_type(MonoReflectionType *p_key_reftype, MonoReflectionType *p_value_reftype) {
-	NO_GLUE_RET(NULL);
-	MonoException *exc = NULL;
+	NO_GLUE_RET(nullptr);
+	MonoException *exc = nullptr;
 	MonoReflectionType *reftype = CACHED_METHOD_THUNK(MarshalUtils, MakeGenericDictionaryType).invoke(p_key_reftype, p_value_reftype, &exc);
 	UNHANDLED_EXCEPTION(exc);
 	return GDMono::get_singleton()->get_class(mono_class_from_mono_type(mono_reflection_type_get_type(reftype)));
@@ -674,7 +674,7 @@ GDMonoClass *make_generic_dictionary_type(MonoReflectionType *p_key_reftype, Mon
 } // namespace Marshal
 
 ScopeThreadAttach::ScopeThreadAttach() :
-		mono_thread(NULL) {
+		mono_thread(nullptr) {
 	if (likely(GDMono::get_singleton()->is_runtime_initialized()) && unlikely(!mono_domain_get())) {
 		mono_thread = GDMonoUtils::attach_current_thread();
 	}
@@ -687,7 +687,7 @@ ScopeThreadAttach::~ScopeThreadAttach() {
 }
 
 StringName get_native_godot_class_name(GDMonoClass *p_class) {
-	MonoObject *native_name_obj = p_class->get_field(BINDINGS_NATIVE_NAME_FIELD)->get_value(NULL);
+	MonoObject *native_name_obj = p_class->get_field(BINDINGS_NATIVE_NAME_FIELD)->get_value(nullptr);
 	StringName *ptr = GDMonoMarshal::unbox<StringName *>(CACHED_FIELD(StringName, ptr)->get_value(native_name_obj));
 	return ptr ? *ptr : StringName();
 }
diff --git a/modules/mono/mono_gd/gd_mono_utils.h b/modules/mono/mono_gd/gd_mono_utils.h
index fd02907d87..b850e1be9b 100644
--- a/modules/mono/mono_gd/gd_mono_utils.h
+++ b/modules/mono/mono_gd/gd_mono_utils.h
@@ -41,7 +41,7 @@
 #include "core/reference.h"
 
 #define UNHANDLED_EXCEPTION(m_exc)                     \
-	if (unlikely(m_exc != NULL)) {                     \
+	if (unlikely(m_exc != nullptr)) {                  \
 		GDMonoUtils::debug_unhandled_exception(m_exc); \
 		GD_UNREACHABLE();                              \
 	}
@@ -77,7 +77,7 @@ _FORCE_INLINE_ void hash_combine(uint32_t &p_hash, const uint32_t &p_with_hash)
 /**
  * If the object has a csharp script, returns the target of the gchandle stored in the script instance
  * Otherwise returns a newly constructed MonoObject* which is attached to the object
- * Returns NULL on error
+ * Returns nullptr on error
  */
 MonoObject *unmanaged_get_managed(Object *unmanaged);
 
@@ -89,7 +89,7 @@ MonoThread *get_current_thread();
 bool is_thread_attached();
 
 _FORCE_INLINE_ bool is_main_thread() {
-	return mono_domain_get() != NULL && mono_thread_get_main() == mono_thread_current();
+	return mono_domain_get() != nullptr && mono_thread_get_main() == mono_thread_current();
 }
 
 uint32_t new_strong_gchandle(MonoObject *p_object);
@@ -97,7 +97,7 @@ uint32_t new_strong_gchandle_pinned(MonoObject *p_object);
 uint32_t new_weak_gchandle(MonoObject *p_object);
 void free_gchandle(uint32_t p_gchandle);
 
-void runtime_object_init(MonoObject *p_this_obj, GDMonoClass *p_class, MonoException **r_exc = NULL);
+void runtime_object_init(MonoObject *p_this_obj, GDMonoClass *p_class, MonoException **r_exc = nullptr);
 
 bool mono_delegate_equal(MonoDelegate *p_a, MonoDelegate *p_b);
 
diff --git a/modules/mono/mono_gd/managed_type.h b/modules/mono/mono_gd/managed_type.h
index 11b832d0cc..84d1837853 100644
--- a/modules/mono/mono_gd/managed_type.h
+++ b/modules/mono/mono_gd/managed_type.h
@@ -46,7 +46,7 @@ struct ManagedType {
 
 	ManagedType() :
 			type_encoding(0),
-			type_class(NULL) {
+			type_class(nullptr) {
 	}
 
 	ManagedType(int p_type_encoding, GDMonoClass *p_type_class) :
diff --git a/modules/mono/mono_gd/support/android_support.cpp b/modules/mono/mono_gd/support/android_support.cpp
index 222b50730d..8bcdeec9dd 100755
--- a/modules/mono/mono_gd/support/android_support.cpp
+++ b/modules/mono/mono_gd/support/android_support.cpp
@@ -69,7 +69,7 @@ struct ScopedLocalRef {
 	_FORCE_INLINE_ operator T() const { return local_ref; }
 	_FORCE_INLINE_ operator jvalue() const { return (jvalue)local_ref; }
 
-	_FORCE_INLINE_ operator bool() const { return local_ref != NULL; }
+	_FORCE_INLINE_ operator bool() const { return local_ref != nullptr; }
 
 	_FORCE_INLINE_ bool operator==(std::nullptr_t) const {
 		return local_ref == nullptr;
@@ -124,7 +124,7 @@ String determine_app_native_lib_dir() {
 
 	String result;
 
-	const char *const nativeLibraryDirUtf8 = env->GetStringUTFChars(nativeLibraryDir, NULL);
+	const char *const nativeLibraryDirUtf8 = env->GetStringUTFChars(nativeLibraryDir, nullptr);
 	if (nativeLibraryDirUtf8) {
 		result.parse_utf8(nativeLibraryDirUtf8);
 		env->ReleaseStringUTFChars(nativeLibraryDir, nativeLibraryDirUtf8);
@@ -159,14 +159,14 @@ int gd_mono_convert_dl_flags(int flags) {
 const char *mono_so_name = GD_MONO_SO_NAME;
 const char *godot_so_name = "libgodot_android.so";
 
-void *mono_dl_handle = NULL;
-void *godot_dl_handle = NULL;
+void *mono_dl_handle = nullptr;
+void *godot_dl_handle = nullptr;
 
 void *try_dlopen(const String &p_so_path, int p_flags) {
 	if (!FileAccess::exists(p_so_path)) {
 		if (OS::get_singleton()->is_stdout_verbose())
 			OS::get_singleton()->print("Cannot find shared library: '%s'\n", p_so_path.utf8().get_data());
-		return NULL;
+		return nullptr;
 	}
 
 	int lflags = gd_mono_convert_dl_flags(p_flags);
@@ -176,7 +176,7 @@ void *try_dlopen(const String &p_so_path, int p_flags) {
 	if (!handle) {
 		if (OS::get_singleton()->is_stdout_verbose())
 			OS::get_singleton()->print("Failed to open shared library: '%s'. Error: '%s'\n", p_so_path.utf8().get_data(), dlerror());
-		return NULL;
+		return nullptr;
 	}
 
 	if (OS::get_singleton()->is_stdout_verbose())
@@ -186,7 +186,7 @@ void *try_dlopen(const String &p_so_path, int p_flags) {
 }
 
 void *gd_mono_android_dlopen(const char *p_name, int p_flags, char **r_err, void *p_user_data) {
-	if (p_name == NULL) {
+	if (p_name == nullptr) {
 		// __Internal
 
 		if (!mono_dl_handle) {
@@ -211,7 +211,7 @@ void *gd_mono_android_dlopen(const char *p_name, int p_flags, char **r_err, void
 		return try_dlopen(so_path, p_flags);
 	}
 
-	return NULL;
+	return nullptr;
 }
 
 void *gd_mono_android_dlsym(void *p_handle, const char *p_name, char **r_err, void *p_user_data) {
@@ -232,7 +232,7 @@ void *gd_mono_android_dlsym(void *p_handle, const char *p_name, char **r_err, vo
 	if (r_err)
 		*r_err = str_format_new("%s\n", dlerror());
 
-	return NULL;
+	return nullptr;
 }
 
 void *gd_mono_android_dlclose(void *p_handle, void *p_user_data) {
@@ -240,9 +240,9 @@ void *gd_mono_android_dlclose(void *p_handle, void *p_user_data) {
 
 	// Not sure if this ever happens. Does Mono close the handle for the main module?
 	if (p_handle == mono_dl_handle)
-		mono_dl_handle = NULL;
+		mono_dl_handle = nullptr;
 
-	return NULL;
+	return nullptr;
 }
 
 int32_t build_version_sdk_int = 0;
@@ -267,7 +267,7 @@ int32_t get_build_version_sdk_int() {
 	return build_version_sdk_int;
 }
 
-jobject certStore = NULL; // KeyStore
+jobject certStore = nullptr; // KeyStore
 
 MonoBoolean _gd_mono_init_cert_store() {
 	// The JNI code is the equivalent of:
@@ -295,7 +295,7 @@ MonoBoolean _gd_mono_init_cert_store() {
 	if (jni_exception_check(env))
 		return 0;
 
-	env->CallVoidMethod(certStoreLocal, load, NULL);
+	env->CallVoidMethod(certStoreLocal, load, nullptr);
 
 	if (jni_exception_check(env))
 		return 0;
@@ -319,7 +319,7 @@ MonoArray *_gd_mono_android_cert_store_lookup(MonoString *p_alias) {
 	if (!mono_error_ok(&mono_error)) {
 		ERR_PRINT(String() + "Failed to convert MonoString* to UTF-8: '" + mono_error_get_message(&mono_error) + "'.");
 		mono_error_cleanup(&mono_error);
-		return NULL;
+		return nullptr;
 	}
 
 	JNIEnv *env = ThreadAndroid::get_env();
@@ -328,20 +328,20 @@ MonoArray *_gd_mono_android_cert_store_lookup(MonoString *p_alias) {
 	mono_free(alias_utf8);
 
 	ScopedLocalRef<jclass> keyStoreClass(env, env->FindClass("java/security/KeyStore"));
-	ERR_FAIL_NULL_V(keyStoreClass, NULL);
+	ERR_FAIL_NULL_V(keyStoreClass, nullptr);
 	ScopedLocalRef<jclass> certificateClass(env, env->FindClass("java/security/cert/Certificate"));
-	ERR_FAIL_NULL_V(certificateClass, NULL);
+	ERR_FAIL_NULL_V(certificateClass, nullptr);
 
 	jmethodID getCertificate = env->GetMethodID(keyStoreClass, "getCertificate", "(Ljava/lang/String;)Ljava/security/cert/Certificate;");
-	ERR_FAIL_NULL_V(getCertificate, NULL);
+	ERR_FAIL_NULL_V(getCertificate, nullptr);
 
 	jmethodID getEncoded = env->GetMethodID(certificateClass, "getEncoded", "()[B");
-	ERR_FAIL_NULL_V(getEncoded, NULL);
+	ERR_FAIL_NULL_V(getEncoded, nullptr);
 
 	ScopedLocalRef<jobject> certificate(env, env->CallObjectMethod(certStore, getCertificate, js_alias.get()));
 
 	if (!certificate)
-		return NULL;
+		return nullptr;
 
 	ScopedLocalRef<jbyteArray> encoded(env, (jbyteArray)env->CallObjectMethod(certificate, getEncoded));
 	jsize encodedLength = env->GetArrayLength(encoded);
@@ -363,7 +363,7 @@ void initialize() {
 	// We need to set this environment variable to make the monodroid BCL use btls instead of legacy as the default provider
 	OS::get_singleton()->set_environment("XA_TLS_PROVIDER", "btls");
 
-	mono_dl_fallback_register(gd_mono_android_dlopen, gd_mono_android_dlsym, gd_mono_android_dlclose, NULL);
+	mono_dl_fallback_register(gd_mono_android_dlopen, gd_mono_android_dlsym, gd_mono_android_dlclose, nullptr);
 
 	String app_native_lib_dir = get_app_native_lib_dir();
 	String so_path = path::join(app_native_lib_dir, godot_so_name);
@@ -375,16 +375,16 @@ void cleanup() {
 	// This is called after shutting down the Mono runtime
 
 	if (mono_dl_handle)
-		gd_mono_android_dlclose(mono_dl_handle, NULL);
+		gd_mono_android_dlclose(mono_dl_handle, nullptr);
 
 	if (godot_dl_handle)
-		gd_mono_android_dlclose(godot_dl_handle, NULL);
+		gd_mono_android_dlclose(godot_dl_handle, nullptr);
 
 	JNIEnv *env = ThreadAndroid::get_env();
 
 	if (certStore) {
 		env->DeleteGlobalRef(certStore);
-		certStore = NULL;
+		certStore = nullptr;
 	}
 }
 
@@ -421,7 +421,7 @@ GD_PINVOKE_EXPORT int32_t monodroid_get_system_property(const char *p_name, char
 			memcpy(*r_value, prop_value_str, len);
 			(*r_value)[len] = '\0';
 		} else {
-			*r_value = NULL;
+			*r_value = nullptr;
 		}
 	}
 
@@ -608,7 +608,7 @@ GD_PINVOKE_EXPORT int32_t _monodroid_get_dns_servers(void **r_dns_servers_array)
 	if (!r_dns_servers_array)
 		return -1;
 
-	*r_dns_servers_array = NULL;
+	*r_dns_servers_array = nullptr;
 
 	char *dns_servers[dns_servers_len];
 	int dns_servers_count = 0;
@@ -652,23 +652,23 @@ GD_PINVOKE_EXPORT const char *_monodroid_timezone_get_default_id() {
 	JNIEnv *env = ThreadAndroid::get_env();
 
 	ScopedLocalRef<jclass> timeZoneClass(env, env->FindClass("java/util/TimeZone"));
-	ERR_FAIL_NULL_V(timeZoneClass, NULL);
+	ERR_FAIL_NULL_V(timeZoneClass, nullptr);
 
 	jmethodID getDefault = env->GetStaticMethodID(timeZoneClass, "getDefault", "()Ljava/util/TimeZone;");
-	ERR_FAIL_NULL_V(getDefault, NULL);
+	ERR_FAIL_NULL_V(getDefault, nullptr);
 
 	jmethodID getID = env->GetMethodID(timeZoneClass, "getID", "()Ljava/lang/String;");
-	ERR_FAIL_NULL_V(getID, NULL);
+	ERR_FAIL_NULL_V(getID, nullptr);
 
 	ScopedLocalRef<jobject> defaultTimeZone(env, env->CallStaticObjectMethod(timeZoneClass, getDefault));
 
 	if (!defaultTimeZone)
-		return NULL;
+		return nullptr;
 
 	ScopedLocalRef<jstring> defaultTimeZoneID(env, (jstring)env->CallObjectMethod(defaultTimeZone, getID));
 
 	if (!defaultTimeZoneID)
-		return NULL;
+		return nullptr;
 
 	const char *default_time_zone_id = env->GetStringUTFChars(defaultTimeZoneID, 0);