Zero initialize all pointer class and struct members

This prevents the pitfall of UB when checking if they have been
assigned something valid by comparing to nullptr.

27 files changed, 168 insertions, 168 deletions

diff --git a/modules/csg/csg_shape.h b/modules/csg/csg_shape.h
index 4721d0c11c..b5d5f97cf3 100644
--- a/modules/csg/csg_shape.h
+++ b/modules/csg/csg_shape.h
@@ -368,7 +368,7 @@ private:
 	PathRotation path_rotation;
 	bool path_local;
 
-	Path3D *path;
+	Path3D *path = nullptr;
 
 	bool smooth_faces;
 	bool path_continuous_u;
diff --git a/modules/gdscript/gdscript.h b/modules/gdscript/gdscript.h
index f7fa967883..82125610c2 100644
--- a/modules/gdscript/gdscript.h
+++ b/modules/gdscript/gdscript.h
@@ -265,7 +265,7 @@ class GDScriptInstance : public ScriptInstance {
 	friend struct GDScriptUtilityFunctionsDefinitions;
 
 	ObjectID owner_id;
-	Object *owner;
+	Object *owner = nullptr;
 	Ref<GDScript> script;
 #ifdef DEBUG_ENABLED
 	Map<StringName, int> member_indices_cache; //used only for hot script reloading
@@ -311,17 +311,17 @@ class GDScriptLanguage : public ScriptLanguage {
 
 	static GDScriptLanguage *singleton;
 
-	Variant *_global_array;
+	Variant *_global_array = nullptr;
 	Vector<Variant> global_array;
 	Map<StringName, int> globals;
 	Map<StringName, Variant> named_globals;
 
 	struct CallLevel {
-		Variant *stack;
-		GDScriptFunction *function;
-		GDScriptInstance *instance;
-		int *ip;
-		int *line;
+		Variant *stack = nullptr;
+		GDScriptFunction *function = nullptr;
+		GDScriptInstance *instance = nullptr;
+		int *ip = nullptr;
+		int *line = nullptr;
 	};
 
 	int _debug_parse_err_line;
@@ -329,7 +329,7 @@ class GDScriptLanguage : public ScriptLanguage {
 	String _debug_error;
 	int _debug_call_stack_pos;
 	int _debug_max_call_stack;
-	CallLevel *_call_stack;
+	CallLevel *_call_stack = nullptr;
 
 	void _add_global(const StringName &p_name, const Variant &p_value);
 
diff --git a/modules/gdscript/language_server/gdscript_text_document.h b/modules/gdscript/language_server/gdscript_text_document.h
index eb7b2c0240..a0e584e525 100644
--- a/modules/gdscript/language_server/gdscript_text_document.h
+++ b/modules/gdscript/language_server/gdscript_text_document.h
@@ -40,7 +40,7 @@ class GDScriptTextDocument : public RefCounted {
 protected:
 	static void _bind_methods();
 
-	FileAccess *file_checker;
+	FileAccess *file_checker = nullptr;
 
 	void didOpen(const Variant &p_param);
 	void didClose(const Variant &p_param);
diff --git a/modules/gdscript/tests/gdscript_test_runner.h b/modules/gdscript/tests/gdscript_test_runner.h
index 1a950c6898..d6c6419e21 100644
--- a/modules/gdscript/tests/gdscript_test_runner.h
+++ b/modules/gdscript/tests/gdscript_test_runner.h
@@ -63,8 +63,8 @@ public:
 
 private:
 	struct ErrorHandlerData {
-		TestResult *result;
-		GDScriptTest *self;
+		TestResult *result = nullptr;
+		GDScriptTest *self = nullptr;
 		ErrorHandlerData(TestResult *p_result, GDScriptTest *p_this) {
 			result = p_result;
 			self = p_this;
diff --git a/modules/gridmap/editor/grid_map_editor_plugin.h b/modules/gridmap/editor/grid_map_editor_plugin.h
index adb0da6e2c..3b29397502 100644
--- a/modules/gridmap/editor/grid_map_editor_plugin.h
+++ b/modules/gridmap/editor/grid_map_editor_plugin.h
@@ -62,21 +62,21 @@ class GridMapEditor : public VBoxContainer {
 		DISPLAY_LIST
 	};
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 	InputAction input_action = INPUT_NONE;
-	Panel *panel;
-	MenuButton *options;
-	SpinBox *floor;
+	Panel *panel = nullptr;
+	MenuButton *options = nullptr;
+	SpinBox *floor = nullptr;
 	double accumulated_floor_delta = 0.0;
-	Button *mode_thumbnail;
-	Button *mode_list;
-	LineEdit *search_box;
-	HSlider *size_slider;
-	HBoxContainer *spatial_editor_hb;
-	ConfirmationDialog *settings_dialog;
-	VBoxContainer *settings_vbc;
-	SpinBox *settings_pick_distance;
-	Label *spin_box_label;
+	Button *mode_thumbnail = nullptr;
+	Button *mode_list = nullptr;
+	LineEdit *search_box = nullptr;
+	HSlider *size_slider = nullptr;
+	HBoxContainer *spatial_editor_hb = nullptr;
+	ConfirmationDialog *settings_dialog = nullptr;
+	VBoxContainer *settings_vbc = nullptr;
+	SpinBox *settings_pick_distance = nullptr;
+	Label *spin_box_label = nullptr;
 
 	struct SetItem {
 		Vector3i position;
@@ -89,7 +89,7 @@ class GridMapEditor : public VBoxContainer {
 	List<SetItem> set_items;
 
 	GridMap *node = nullptr;
-	MeshLibrary *last_mesh_library;
+	MeshLibrary *last_mesh_library = nullptr;
 
 	Transform3D grid_xform;
 	Transform3D edit_grid_xform;
@@ -173,15 +173,15 @@ class GridMapEditor : public VBoxContainer {
 
 	};
 
-	Node3DEditorPlugin *spatial_editor;
+	Node3DEditorPlugin *spatial_editor = nullptr;
 
 	struct AreaDisplay {
 		RID mesh;
 		RID instance;
 	};
 
-	ItemList *mesh_library_palette;
-	Label *info_message;
+	ItemList *mesh_library_palette = nullptr;
+	Label *info_message = nullptr;
 
 	void update_grid(); // Change which and where the grid is displayed
 	void _draw_grids(const Vector3 &cell_size);
@@ -234,7 +234,7 @@ public:
 class GridMapEditorPlugin : public EditorPlugin {
 	GDCLASS(GridMapEditorPlugin, EditorPlugin);
 
-	GridMapEditor *grid_map_editor;
+	GridMapEditor *grid_map_editor = nullptr;
 
 protected:
 	void _notification(int p_what);
diff --git a/modules/mono/glue/arguments_vector.h b/modules/mono/glue/arguments_vector.h
index 7c991d87a4..4405809887 100644
--- a/modules/mono/glue/arguments_vector.h
+++ b/modules/mono/glue/arguments_vector.h
@@ -37,7 +37,7 @@ template <typename T, int POOL_SIZE = 5>
 struct ArgumentsVector {
 private:
 	T pool[POOL_SIZE];
-	T *_ptr;
+	T *_ptr = nullptr;
 	int size;
 
 	ArgumentsVector() = delete;
diff --git a/modules/mono/managed_callable.h b/modules/mono/managed_callable.h
index ea7231f43b..d50a8a7b08 100644
--- a/modules/mono/managed_callable.h
+++ b/modules/mono/managed_callable.h
@@ -43,7 +43,7 @@
 class ManagedCallable : public CallableCustom {
 	friend class CSharpLanguage;
 	MonoGCHandleData delegate_handle;
-	GDMonoMethod *delegate_invoke;
+	GDMonoMethod *delegate_invoke = nullptr;
 
 #ifdef GD_MONO_HOT_RELOAD
 	SelfList<ManagedCallable> self_instance = this;
diff --git a/modules/mono/mono_gd/gd_mono.h b/modules/mono/mono_gd/gd_mono.h
index aab0b31c37..51fd0f8483 100644
--- a/modules/mono/mono_gd/gd_mono.h
+++ b/modules/mono/mono_gd/gd_mono.h
@@ -94,16 +94,16 @@ private:
 
 	UnhandledExceptionPolicy unhandled_exception_policy;
 
-	MonoDomain *root_domain;
-	MonoDomain *scripts_domain;
+	MonoDomain *root_domain = nullptr;
+	MonoDomain *scripts_domain = nullptr;
 
 	HashMap<int32_t, HashMap<String, GDMonoAssembly *>> assemblies;
 
-	GDMonoAssembly *corlib_assembly;
-	GDMonoAssembly *project_assembly;
+	GDMonoAssembly *corlib_assembly = nullptr;
+	GDMonoAssembly *project_assembly = nullptr;
 #ifdef TOOLS_ENABLED
-	GDMonoAssembly *tools_assembly;
-	GDMonoAssembly *tools_project_editor_assembly;
+	GDMonoAssembly *tools_assembly = nullptr;
+	GDMonoAssembly *tools_project_editor_assembly = nullptr;
 #endif
 
 	LoadedApiAssembly core_api_assembly;
@@ -150,7 +150,7 @@ private:
 	void _init_godot_api_hashes();
 	void _init_exception_policy();
 
-	GDMonoLog *gdmono_log;
+	GDMonoLog *gdmono_log = nullptr;
 
 #if defined(WINDOWS_ENABLED) && defined(TOOLS_ENABLED)
 	MonoRegInfo mono_reg_info;
@@ -250,7 +250,7 @@ public:
 namespace gdmono {
 
 class ScopeDomain {
-	MonoDomain *prev_domain;
+	MonoDomain *prev_domain = nullptr;
 
 public:
 	ScopeDomain(MonoDomain *p_domain) {
@@ -270,7 +270,7 @@ public:
 };
 
 class ScopeExitDomainUnload {
-	MonoDomain *domain;
+	MonoDomain *domain = nullptr;
 
 public:
 	ScopeExitDomainUnload(MonoDomain *p_domain) :
diff --git a/modules/mono/mono_gd/gd_mono_assembly.h b/modules/mono/mono_gd/gd_mono_assembly.h
index b25d773be7..a96357b082 100644
--- a/modules/mono/mono_gd/gd_mono_assembly.h
+++ b/modules/mono/mono_gd/gd_mono_assembly.h
@@ -68,8 +68,8 @@ class GDMonoAssembly {
 	};
 
 	String name;
-	MonoImage *image;
-	MonoAssembly *assembly;
+	MonoImage *image = nullptr;
+	MonoAssembly *assembly = nullptr;
 
 	bool attrs_fetched = false;
 	MonoCustomAttrInfo *attributes = nullptr;
diff --git a/modules/mono/mono_gd/gd_mono_cache.h b/modules/mono/mono_gd/gd_mono_cache.h
index 49f47b0a15..4000342c94 100644
--- a/modules/mono/mono_gd/gd_mono_cache.h
+++ b/modules/mono/mono_gd/gd_mono_cache.h
@@ -41,91 +41,91 @@ struct CachedData {
 	// corlib classes
 
 	// Let's use the no-namespace format for these too
-	GDMonoClass *class_MonoObject; // object
-	GDMonoClass *class_bool; // bool
-	GDMonoClass *class_int8_t; // sbyte
-	GDMonoClass *class_int16_t; // short
-	GDMonoClass *class_int32_t; // int
-	GDMonoClass *class_int64_t; // long
-	GDMonoClass *class_uint8_t; // byte
-	GDMonoClass *class_uint16_t; // ushort
-	GDMonoClass *class_uint32_t; // uint
-	GDMonoClass *class_uint64_t; // ulong
-	GDMonoClass *class_float; // float
-	GDMonoClass *class_double; // double
-	GDMonoClass *class_String; // string
-	GDMonoClass *class_IntPtr; // System.IntPtr
-
-	GDMonoClass *class_System_Collections_IEnumerable;
-	GDMonoClass *class_System_Collections_ICollection;
-	GDMonoClass *class_System_Collections_IDictionary;
+	GDMonoClass *class_MonoObject = nullptr; // object
+	GDMonoClass *class_bool = nullptr; // bool
+	GDMonoClass *class_int8_t = nullptr; // sbyte
+	GDMonoClass *class_int16_t = nullptr; // short
+	GDMonoClass *class_int32_t = nullptr; // int
+	GDMonoClass *class_int64_t = nullptr; // long
+	GDMonoClass *class_uint8_t = nullptr; // byte
+	GDMonoClass *class_uint16_t = nullptr; // ushort
+	GDMonoClass *class_uint32_t = nullptr; // uint
+	GDMonoClass *class_uint64_t = nullptr; // ulong
+	GDMonoClass *class_float = nullptr; // float
+	GDMonoClass *class_double = nullptr; // double
+	GDMonoClass *class_String = nullptr; // string
+	GDMonoClass *class_IntPtr = nullptr; // System.IntPtr
+
+	GDMonoClass *class_System_Collections_IEnumerable = nullptr;
+	GDMonoClass *class_System_Collections_ICollection = nullptr;
+	GDMonoClass *class_System_Collections_IDictionary = nullptr;
 
 #ifdef DEBUG_ENABLED
-	GDMonoClass *class_System_Diagnostics_StackTrace;
+	GDMonoClass *class_System_Diagnostics_StackTrace = nullptr;
 	GDMonoMethodThunkR<MonoArray *, MonoObject *> methodthunk_System_Diagnostics_StackTrace_GetFrames;
-	GDMonoMethod *method_System_Diagnostics_StackTrace_ctor_bool;
-	GDMonoMethod *method_System_Diagnostics_StackTrace_ctor_Exception_bool;
+	GDMonoMethod *method_System_Diagnostics_StackTrace_ctor_bool = nullptr;
+	GDMonoMethod *method_System_Diagnostics_StackTrace_ctor_Exception_bool = nullptr;
 #endif
 
-	GDMonoClass *class_KeyNotFoundException;
+	GDMonoClass *class_KeyNotFoundException = nullptr;
 
-	MonoClass *rawclass_Dictionary;
+	MonoClass *rawclass_Dictionary = nullptr;
 	// -----------------------------------------------
 
-	GDMonoClass *class_Vector2;
-	GDMonoClass *class_Vector2i;
-	GDMonoClass *class_Rect2;
-	GDMonoClass *class_Rect2i;
-	GDMonoClass *class_Transform2D;
-	GDMonoClass *class_Vector3;
-	GDMonoClass *class_Vector3i;
-	GDMonoClass *class_Basis;
-	GDMonoClass *class_Quaternion;
-	GDMonoClass *class_Transform3D;
-	GDMonoClass *class_AABB;
-	GDMonoClass *class_Color;
-	GDMonoClass *class_Plane;
-	GDMonoClass *class_StringName;
-	GDMonoClass *class_NodePath;
-	GDMonoClass *class_RID;
-	GDMonoClass *class_GodotObject;
-	GDMonoClass *class_GodotResource;
-	GDMonoClass *class_Node;
-	GDMonoClass *class_Control;
-	GDMonoClass *class_Node3D;
-	GDMonoClass *class_WeakRef;
-	GDMonoClass *class_Callable;
-	GDMonoClass *class_SignalInfo;
-	GDMonoClass *class_Array;
-	GDMonoClass *class_Dictionary;
-	GDMonoClass *class_MarshalUtils;
-	GDMonoClass *class_ISerializationListener;
+	GDMonoClass *class_Vector2 = nullptr;
+	GDMonoClass *class_Vector2i = nullptr;
+	GDMonoClass *class_Rect2 = nullptr;
+	GDMonoClass *class_Rect2i = nullptr;
+	GDMonoClass *class_Transform2D = nullptr;
+	GDMonoClass *class_Vector3 = nullptr;
+	GDMonoClass *class_Vector3i = nullptr;
+	GDMonoClass *class_Basis = nullptr;
+	GDMonoClass *class_Quaternion = nullptr;
+	GDMonoClass *class_Transform3D = nullptr;
+	GDMonoClass *class_AABB = nullptr;
+	GDMonoClass *class_Color = nullptr;
+	GDMonoClass *class_Plane = nullptr;
+	GDMonoClass *class_StringName = nullptr;
+	GDMonoClass *class_NodePath = nullptr;
+	GDMonoClass *class_RID = nullptr;
+	GDMonoClass *class_GodotObject = nullptr;
+	GDMonoClass *class_GodotResource = nullptr;
+	GDMonoClass *class_Node = nullptr;
+	GDMonoClass *class_Control = nullptr;
+	GDMonoClass *class_Node3D = nullptr;
+	GDMonoClass *class_WeakRef = nullptr;
+	GDMonoClass *class_Callable = nullptr;
+	GDMonoClass *class_SignalInfo = nullptr;
+	GDMonoClass *class_Array = nullptr;
+	GDMonoClass *class_Dictionary = nullptr;
+	GDMonoClass *class_MarshalUtils = nullptr;
+	GDMonoClass *class_ISerializationListener = nullptr;
 
 #ifdef DEBUG_ENABLED
-	GDMonoClass *class_DebuggingUtils;
+	GDMonoClass *class_DebuggingUtils = nullptr;
 	GDMonoMethodThunk<MonoObject *, MonoString **, int *, MonoString **> methodthunk_DebuggingUtils_GetStackFrameInfo;
 #endif
 
-	GDMonoClass *class_ExportAttribute;
-	GDMonoField *field_ExportAttribute_hint;
-	GDMonoField *field_ExportAttribute_hintString;
-	GDMonoClass *class_SignalAttribute;
-	GDMonoClass *class_ToolAttribute;
-	GDMonoClass *class_AnyPeerAttribute;
-	GDMonoClass *class_AuthorityAttribute;
-	GDMonoClass *class_GodotMethodAttribute;
-	GDMonoField *field_GodotMethodAttribute_methodName;
-	GDMonoClass *class_ScriptPathAttribute;
-	GDMonoField *field_ScriptPathAttribute_path;
-	GDMonoClass *class_AssemblyHasScriptsAttribute;
-	GDMonoField *field_AssemblyHasScriptsAttribute_requiresLookup;
-	GDMonoField *field_AssemblyHasScriptsAttribute_scriptTypes;
-
-	GDMonoField *field_GodotObject_ptr;
-	GDMonoField *field_StringName_ptr;
-	GDMonoField *field_NodePath_ptr;
-	GDMonoField *field_Image_ptr;
-	GDMonoField *field_RID_ptr;
+	GDMonoClass *class_ExportAttribute = nullptr;
+	GDMonoField *field_ExportAttribute_hint = nullptr;
+	GDMonoField *field_ExportAttribute_hintString = nullptr;
+	GDMonoClass *class_SignalAttribute = nullptr;
+	GDMonoClass *class_ToolAttribute = nullptr;
+	GDMonoClass *class_AnyPeerAttribute = nullptr;
+	GDMonoClass *class_AuthorityAttribute = nullptr;
+	GDMonoClass *class_GodotMethodAttribute = nullptr;
+	GDMonoField *field_GodotMethodAttribute_methodName = nullptr;
+	GDMonoClass *class_ScriptPathAttribute = nullptr;
+	GDMonoField *field_ScriptPathAttribute_path = nullptr;
+	GDMonoClass *class_AssemblyHasScriptsAttribute = nullptr;
+	GDMonoField *field_AssemblyHasScriptsAttribute_requiresLookup = nullptr;
+	GDMonoField *field_AssemblyHasScriptsAttribute_scriptTypes = nullptr;
+
+	GDMonoField *field_GodotObject_ptr = nullptr;
+	GDMonoField *field_StringName_ptr = nullptr;
+	GDMonoField *field_NodePath_ptr = nullptr;
+	GDMonoField *field_Image_ptr = nullptr;
+	GDMonoField *field_RID_ptr = nullptr;
 
 	GDMonoMethodThunk<MonoObject *> methodthunk_GodotObject_Dispose;
 	GDMonoMethodThunkR<Array *, MonoObject *> methodthunk_Array_GetPtr;
diff --git a/modules/mono/mono_gd/gd_mono_class.h b/modules/mono/mono_gd/gd_mono_class.h
index bfb5797d4b..b32d561f61 100644
--- a/modules/mono/mono_gd/gd_mono_class.h
+++ b/modules/mono/mono_gd/gd_mono_class.h
@@ -70,11 +70,11 @@ class GDMonoClass {
 	StringName namespace_name;
 	StringName class_name;
 
-	MonoClass *mono_class;
-	GDMonoAssembly *assembly;
+	MonoClass *mono_class = nullptr;
+	GDMonoAssembly *assembly = nullptr;
 
 	bool attrs_fetched;
-	MonoCustomAttrInfo *attributes;
+	MonoCustomAttrInfo *attributes = nullptr;
 
 	// This contains both the original method names and remapped method names from the native Godot identifiers to the C# functions.
 	// Most method-related functions refer to this and it's possible this is unintuitive for outside users; this may be a prime location for refactoring or renaming.
diff --git a/modules/mono/mono_gd/gd_mono_field.h b/modules/mono/mono_gd/gd_mono_field.h
index abcdef378c..87ef245f3f 100644
--- a/modules/mono/mono_gd/gd_mono_field.h
+++ b/modules/mono/mono_gd/gd_mono_field.h
@@ -36,14 +36,14 @@
 #include "i_mono_class_member.h"
 
 class GDMonoField : public IMonoClassMember {
-	GDMonoClass *owner;
-	MonoClassField *mono_field;
+	GDMonoClass *owner = nullptr;
+	MonoClassField *mono_field = nullptr;
 
 	StringName name;
 	ManagedType type;
 
 	bool attrs_fetched;
-	MonoCustomAttrInfo *attributes;
+	MonoCustomAttrInfo *attributes = nullptr;
 
 public:
 	virtual GDMonoClass *get_enclosing_class() const final { return owner; }
diff --git a/modules/mono/mono_gd/gd_mono_marshal.h b/modules/mono/mono_gd/gd_mono_marshal.h
index 20d4743e5c..eb33c6119e 100644
--- a/modules/mono/mono_gd/gd_mono_marshal.h
+++ b/modules/mono/mono_gd/gd_mono_marshal.h
@@ -196,14 +196,14 @@ PackedVector3Array mono_array_to_PackedVector3Array(MonoArray *p_array);
 #pragma pack(push, 1)
 
 struct M_Callable {
-	MonoObject *target;
-	MonoObject *method_string_name;
-	MonoDelegate *delegate;
+	MonoObject *target = nullptr;
+	MonoObject *method_string_name = nullptr;
+	MonoDelegate *delegate = nullptr;
 };
 
 struct M_SignalInfo {
-	MonoObject *owner;
-	MonoObject *name_string_name;
+	MonoObject *owner = nullptr;
+	MonoObject *name_string_name = nullptr;
 };
 
 #pragma pack(pop)
diff --git a/modules/mono/mono_gd/gd_mono_method.h b/modules/mono/mono_gd/gd_mono_method.h
index 6e87a60ee2..be11ef5bfe 100644
--- a/modules/mono/mono_gd/gd_mono_method.h
+++ b/modules/mono/mono_gd/gd_mono_method.h
@@ -54,7 +54,7 @@ class GDMonoMethod : public IMonoClassMember {
 
 	friend class GDMonoClass;
 
-	MonoMethod *mono_method;
+	MonoMethod *mono_method = nullptr;
 
 public:
 	virtual GDMonoClass *get_enclosing_class() const final;
diff --git a/modules/mono/mono_gd/gd_mono_property.h b/modules/mono/mono_gd/gd_mono_property.h
index 003bcf05e1..6fc681aeb5 100644
--- a/modules/mono/mono_gd/gd_mono_property.h
+++ b/modules/mono/mono_gd/gd_mono_property.h
@@ -36,14 +36,14 @@
 #include "i_mono_class_member.h"
 
 class GDMonoProperty : public IMonoClassMember {
-	GDMonoClass *owner;
-	MonoProperty *mono_property;
+	GDMonoClass *owner = nullptr;
+	MonoProperty *mono_property = nullptr;
 
 	StringName name;
 	ManagedType type;
 
 	bool attrs_fetched;
-	MonoCustomAttrInfo *attributes;
+	MonoCustomAttrInfo *attributes = nullptr;
 
 	unsigned int param_buffer_size;
 
diff --git a/modules/mono/mono_gd/gd_mono_wasm_m2n.h b/modules/mono/mono_gd/gd_mono_wasm_m2n.h
index 68299aa984..83e2750e5a 100644
--- a/modules/mono/mono_gd/gd_mono_wasm_m2n.h
+++ b/modules/mono/mono_gd/gd_mono_wasm_m2n.h
@@ -47,11 +47,11 @@ struct Mono_InterpMethodArguments {
 	size_t ilen;
 	void **iargs;
 	size_t flen;
-	double *fargs;
+	double *fargs = nullptr;
 	void **retval;
 	size_t is_float_ret;
 	//#ifdef TARGET_WASM
-	void *sig;
+	void *sig = nullptr;
 	//#endif
 };
 } // extern "C"
diff --git a/modules/mono/signal_awaiter_utils.h b/modules/mono/signal_awaiter_utils.h
index 1a62f36625..532aa3e327 100644
--- a/modules/mono/signal_awaiter_utils.h
+++ b/modules/mono/signal_awaiter_utils.h
@@ -68,7 +68,7 @@ public:
 };
 
 class EventSignalCallable : public CallableCustom {
-	Object *owner;
+	Object *owner = nullptr;
 	const CSharpScript::EventSignal *event_signal;
 
 public:
diff --git a/modules/navigation/editor/navigation_mesh_editor_plugin.h b/modules/navigation/editor/navigation_mesh_editor_plugin.h
index 3c3e804fd2..bc9e4185b7 100644
--- a/modules/navigation/editor/navigation_mesh_editor_plugin.h
+++ b/modules/navigation/editor/navigation_mesh_editor_plugin.h
@@ -42,14 +42,14 @@ class NavigationMeshEditor : public Control {
 
 	GDCLASS(NavigationMeshEditor, Control);
 
-	AcceptDialog *err_dialog;
+	AcceptDialog *err_dialog = nullptr;
 
-	HBoxContainer *bake_hbox;
-	Button *button_bake;
-	Button *button_reset;
-	Label *bake_info;
+	HBoxContainer *bake_hbox = nullptr;
+	Button *button_bake = nullptr;
+	Button *button_reset = nullptr;
+	Label *bake_info = nullptr;
 
-	NavigationRegion3D *node;
+	NavigationRegion3D *node = nullptr;
 
 	void _bake_pressed();
 	void _clear_pressed();
@@ -68,7 +68,7 @@ public:
 class NavigationMeshEditorPlugin : public EditorPlugin {
 	GDCLASS(NavigationMeshEditorPlugin, EditorPlugin);
 
-	NavigationMeshEditor *navigation_mesh_editor;
+	NavigationMeshEditor *navigation_mesh_editor = nullptr;
 
 public:
 	virtual String get_name() const override { return "NavigationMesh"; }
diff --git a/modules/navigation/nav_utils.h b/modules/navigation/nav_utils.h
index 0c02885b10..5b6c695ca4 100644
--- a/modules/navigation/nav_utils.h
+++ b/modules/navigation/nav_utils.h
@@ -89,7 +89,7 @@ struct Edge {
 };
 
 struct Polygon {
-	NavRegion *owner;
+	NavRegion *owner = nullptr;
 
 	/// The points of this `Polygon`
 	std::vector<Point> points;
diff --git a/modules/noise/noise.h b/modules/noise/noise.h
index c05bc057da..767aa830e8 100644
--- a/modules/noise/noise.h
+++ b/modules/noise/noise.h
@@ -39,7 +39,7 @@ class Noise : public Resource {
 	// Helper struct for get_seamless_image(). See comments in .cpp for usage.
 	template <typename T>
 	struct img_buff {
-		T *img;
+		T *img = nullptr;
 		int width; // Array dimensions & default modulo for image.
 		int height;
 		int offset_x; // Offset index location on image (wrapped by specified modulo).
diff --git a/modules/openxr/editor/openxr_editor_plugin.h b/modules/openxr/editor/openxr_editor_plugin.h
index 9d04bc4e45..af8ee7d54c 100644
--- a/modules/openxr/editor/openxr_editor_plugin.h
+++ b/modules/openxr/editor/openxr_editor_plugin.h
@@ -37,7 +37,7 @@
 class OpenXREditorPlugin : public EditorPlugin {
 	GDCLASS(OpenXREditorPlugin, EditorPlugin);
 
-	OpenXRActionMapEditor *action_map_editor;
+	OpenXRActionMapEditor *action_map_editor = nullptr;
 
 public:
 	virtual String get_name() const override { return "OpenXRPlugin"; }
diff --git a/modules/openxr/extensions/openxr_extension_wrapper.h b/modules/openxr/extensions/openxr_extension_wrapper.h
index 5242ee6063..00f81731c2 100644
--- a/modules/openxr/extensions/openxr_extension_wrapper.h
+++ b/modules/openxr/extensions/openxr_extension_wrapper.h
@@ -43,7 +43,7 @@ class OpenXRAPI;
 
 class OpenXRExtensionWrapper {
 protected:
-	OpenXRAPI *openxr_api;
+	OpenXRAPI *openxr_api = nullptr;
 
 	// Store extension we require.
 	// If bool pointer is a nullptr this means this extension is mandatory and initialisation will fail if it is not available
diff --git a/modules/raycast/raycast_occlusion_cull.h b/modules/raycast/raycast_occlusion_cull.h
index a22e52dd17..8453c5341d 100644
--- a/modules/raycast/raycast_occlusion_cull.h
+++ b/modules/raycast/raycast_occlusion_cull.h
@@ -115,7 +115,7 @@ private:
 
 	struct Scenario {
 		struct RaycastThreadData {
-			CameraRayTile *rays;
+			CameraRayTile *rays = nullptr;
 			const uint32_t *masks;
 		};
 
@@ -124,7 +124,7 @@ private:
 			uint32_t vertex_count;
 			Transform3D xform;
 			const Vector3 *read;
-			Vector3 *write;
+			Vector3 *write = nullptr;
 		};
 
 		Thread *commit_thread = nullptr;
diff --git a/modules/regex/regex.h b/modules/regex/regex.h
index a745c50a58..e7221f4070 100644
--- a/modules/regex/regex.h
+++ b/modules/regex/regex.h
@@ -71,7 +71,7 @@ public:
 class RegEx : public RefCounted {
 	GDCLASS(RegEx, RefCounted);
 
-	void *general_ctx;
+	void *general_ctx = nullptr;
 	void *code = nullptr;
 	String pattern;
 
diff --git a/modules/theora/video_stream_theora.h b/modules/theora/video_stream_theora.h
index 3bc96908a2..b61412e665 100644
--- a/modules/theora/video_stream_theora.h
+++ b/modules/theora/video_stream_theora.h
@@ -112,7 +112,7 @@ class VideoStreamPlaybackTheora : public VideoStreamPlayback {
 	RingBuffer<uint8_t> ring_buffer;
 	Vector<uint8_t> read_buffer;
 	bool thread_eof = false;
-	Semaphore *thread_sem;
+	Semaphore *thread_sem = nullptr;
 	Thread thread;
 	SafeFlag thread_exit;
 
diff --git a/modules/visual_script/editor/visual_script_property_selector.h b/modules/visual_script/editor/visual_script_property_selector.h
index 6b5112f1af..faf39a14e4 100644
--- a/modules/visual_script/editor/visual_script_property_selector.h
+++ b/modules/visual_script/editor/visual_script_property_selector.h
@@ -62,23 +62,23 @@ class VisualScriptPropertySelector : public ConfirmationDialog {
 		SCOPE_ALL = SCOPE_BASE | SCOPE_INHERITERS | SCOPE_UNRELATED
 	};
 
-	LineEdit *search_box;
+	LineEdit *search_box = nullptr;
 
-	Button *case_sensitive_button;
-	Button *hierarchy_button;
+	Button *case_sensitive_button = nullptr;
+	Button *hierarchy_button = nullptr;
 
-	Button *search_visual_script_nodes;
-	Button *search_classes;
-	Button *search_operators;
+	Button *search_visual_script_nodes = nullptr;
+	Button *search_classes = nullptr;
+	Button *search_operators = nullptr;
 
-	Button *search_methods;
-	Button *search_signals;
-	Button *search_constants;
-	Button *search_properties;
-	Button *search_theme_items;
+	Button *search_methods = nullptr;
+	Button *search_signals = nullptr;
+	Button *search_constants = nullptr;
+	Button *search_properties = nullptr;
+	Button *search_theme_items = nullptr;
 
-	OptionButton *scope_combo;
-	Tree *results_tree;
+	OptionButton *scope_combo = nullptr;
+	Tree *results_tree = nullptr;
 
 	class SearchRunner;
 	Ref<SearchRunner> search_runner;
@@ -94,7 +94,7 @@ class VisualScriptPropertySelector : public ConfirmationDialog {
 	void _item_selected();
 	void _hide_requested();
 
-	EditorHelpBit *help_bit;
+	EditorHelpBit *help_bit = nullptr;
 
 	bool properties = false;
 	bool visual_script_generic = false;
@@ -104,9 +104,9 @@ class VisualScriptPropertySelector : public ConfirmationDialog {
 	String base_type;
 	String base_script;
 	ObjectID script;
-	Object *instance;
+	Object *instance = nullptr;
 	bool virtuals_only = false;
-	VBoxContainer *vbox;
+	VBoxContainer *vbox = nullptr;
 
 protected:
 	void _notification(int p_what);
@@ -159,9 +159,9 @@ class VisualScriptPropertySelector::SearchRunner : public RefCounted {
 		}
 	};
 
-	VisualScriptPropertySelector *selector_ui;
-	Control *ui_service;
-	Tree *results_tree;
+	VisualScriptPropertySelector *selector_ui = nullptr;
+	Control *ui_service = nullptr;
+	Tree *results_tree = nullptr;
 	String term;
 	int search_flags;
 	int scope_flags;
diff --git a/modules/visual_script/visual_script.h b/modules/visual_script/visual_script.h
index d72bdf9128..6b27af15f6 100644
--- a/modules/visual_script/visual_script.h
+++ b/modules/visual_script/visual_script.h
@@ -495,7 +495,7 @@ class VisualScriptLanguage : public ScriptLanguage {
 	String _debug_error;
 	int _debug_call_stack_pos = 0;
 	int _debug_max_call_stack;
-	CallLevel *_call_stack;
+	CallLevel *_call_stack = nullptr;
 
 public:
 	StringName notification = "_notification";