Style: Partially apply clang-tidy's `cppcoreguidelines-pro-type-member-init`

Didn't commit all the changes where it wants to initialize a struct
with `{}`. Should be reviewed in a separate PR.

Option `IgnoreArrays` enabled for now to be conservative, can be
disabled to see if it proposes more useful changes.

Also fixed manually a handful of other missing initializations / moved
some from constructors.

16 files changed, 89 insertions, 93 deletions

diff --git a/modules/cvtt/image_compress_cvtt.cpp b/modules/cvtt/image_compress_cvtt.cpp
index d18340a2c8..a7cfcaa262 100644
--- a/modules/cvtt/image_compress_cvtt.cpp
+++ b/modules/cvtt/image_compress_cvtt.cpp
@@ -46,7 +46,7 @@ struct CVTTCompressionJobParams {
 };
 
 struct CVTTCompressionRowTask {
-	const uint8_t *in_mm_bytes;
+	const uint8_t *in_mm_bytes = nullptr;
 	uint8_t *out_mm_bytes = nullptr;
 	int y_start = 0;
 	int width = 0;
@@ -55,7 +55,7 @@ struct CVTTCompressionRowTask {
 
 struct CVTTCompressionJobQueue {
 	CVTTCompressionJobParams job_params;
-	const CVTTCompressionRowTask *job_tasks;
+	const CVTTCompressionRowTask *job_tasks = nullptr;
 	uint32_t num_tasks = 0;
 	SafeNumeric<uint32_t> current_task;
 };
diff --git a/modules/dds/texture_loader_dds.cpp b/modules/dds/texture_loader_dds.cpp
index 58e5e31f46..ad2d58a0e9 100644
--- a/modules/dds/texture_loader_dds.cpp
+++ b/modules/dds/texture_loader_dds.cpp
@@ -68,7 +68,7 @@ enum DDSFormat {
 };
 
 struct DDSFormatInfo {
-	const char *name;
+	const char *name = nullptr;
 	bool compressed = false;
 	bool palette = false;
 	uint32_t divisor = 0;
diff --git a/modules/gdscript/gdscript_utility_functions.cpp b/modules/gdscript/gdscript_utility_functions.cpp
index 89d94d8635..a914374985 100644
--- a/modules/gdscript/gdscript_utility_functions.cpp
+++ b/modules/gdscript/gdscript_utility_functions.cpp
@@ -545,7 +545,7 @@ struct GDScriptUtilityFunctionsDefinitions {
 };
 
 struct GDScriptUtilityFunctionInfo {
-	GDScriptUtilityFunctions::FunctionPtr function;
+	GDScriptUtilityFunctions::FunctionPtr function = nullptr;
 	MethodInfo info;
 	bool is_constant = false;
 };
diff --git a/modules/openxr/extensions/openxr_vulkan_extension.h b/modules/openxr/extensions/openxr_vulkan_extension.h
index cf55ae264f..1e34fe1f80 100644
--- a/modules/openxr/extensions/openxr_vulkan_extension.h
+++ b/modules/openxr/extensions/openxr_vulkan_extension.h
@@ -78,11 +78,11 @@ private:
 
 	bool check_graphics_api_support(XrVersion p_desired_version);
 
-	VkInstance vulkan_instance;
-	VkPhysicalDevice vulkan_physical_device;
-	VkDevice vulkan_device;
-	uint32_t vulkan_queue_family_index;
-	uint32_t vulkan_queue_index;
+	VkInstance vulkan_instance = nullptr;
+	VkPhysicalDevice vulkan_physical_device = nullptr;
+	VkDevice vulkan_device = nullptr;
+	uint32_t vulkan_queue_family_index = 0;
+	uint32_t vulkan_queue_index = 0;
 
 	XrResult xrGetVulkanGraphicsRequirements2KHR(XrInstance p_instance, XrSystemId p_system_id, XrGraphicsRequirementsVulkanKHR *p_graphics_requirements);
 	XrResult xrCreateVulkanInstanceKHR(XrInstance p_instance, const XrVulkanInstanceCreateInfoKHR *p_create_info, VkInstance *r_vulkan_instance, VkResult *r_vulkan_result);
diff --git a/modules/openxr/openxr_api.h b/modules/openxr/openxr_api.h
index 57475944c0..702f6b9b1d 100644
--- a/modules/openxr/openxr_api.h
+++ b/modules/openxr/openxr_api.h
@@ -104,9 +104,9 @@ private:
 
 	// state
 	XrInstance instance = XR_NULL_HANDLE;
-	XrSystemId system_id;
+	XrSystemId system_id = 0;
 	String system_name;
-	uint32_t vendor_id;
+	uint32_t vendor_id = 0;
 	XrSystemTrackingProperties tracking_properties;
 	XrSession session = XR_NULL_HANDLE;
 	XrSessionState session_state = XR_SESSION_STATE_UNKNOWN;
diff --git a/modules/text_server_adv/text_server_adv.cpp b/modules/text_server_adv/text_server_adv.cpp
index 437fbe76ab..8e0bedd8f6 100644
--- a/modules/text_server_adv/text_server_adv.cpp
+++ b/modules/text_server_adv/text_server_adv.cpp
@@ -878,8 +878,8 @@ _FORCE_INLINE_ TextServerAdvanced::FontTexturePosition TextServerAdvanced::find_
 
 struct MSContext {
 	msdfgen::Point2 position;
-	msdfgen::Shape *shape;
-	msdfgen::Contour *contour;
+	msdfgen::Shape *shape = nullptr;
+	msdfgen::Contour *contour = nullptr;
 };
 
 class DistancePixelConversion {
diff --git a/modules/text_server_fb/text_server_fb.cpp b/modules/text_server_fb/text_server_fb.cpp
index d84e9e581a..8ae56aa64d 100644
--- a/modules/text_server_fb/text_server_fb.cpp
+++ b/modules/text_server_fb/text_server_fb.cpp
@@ -322,8 +322,8 @@ _FORCE_INLINE_ TextServerFallback::FontTexturePosition TextServerFallback::find_
 
 struct MSContext {
 	msdfgen::Point2 position;
-	msdfgen::Shape *shape;
-	msdfgen::Contour *contour;
+	msdfgen::Shape *shape = nullptr;
+	msdfgen::Contour *contour = nullptr;
 };
 
 class DistancePixelConversion {
diff --git a/modules/theora/video_stream_theora.h b/modules/theora/video_stream_theora.h
index 6fa7313fad..8fce85679f 100644
--- a/modules/theora/video_stream_theora.h
+++ b/modules/theora/video_stream_theora.h
@@ -99,7 +99,7 @@ class VideoStreamPlaybackTheora : public VideoStreamPlayback {
 
 	Ref<ImageTexture> texture;
 
-	AudioMixCallback mix_callback;
+	AudioMixCallback mix_callback = nullptr;
 	void *mix_udata = nullptr;
 	bool paused = false;
 
diff --git a/modules/visual_script/editor/visual_script_property_selector.h b/modules/visual_script/editor/visual_script_property_selector.h
index 1b32ee2967..90a6265ab7 100644
--- a/modules/visual_script/editor/visual_script_property_selector.h
+++ b/modules/visual_script/editor/visual_script_property_selector.h
@@ -173,8 +173,8 @@ class VisualScriptPropertySelector::SearchRunner : public RefCounted {
 	Control *ui_service = nullptr;
 	Tree *results_tree = nullptr;
 	String term;
-	int search_flags;
-	int scope_flags;
+	int search_flags = 0;
+	int scope_flags = 0;
 
 	Ref<Texture2D> empty_icon;
 	Color disabled_color;
diff --git a/modules/visual_script/visual_script_builtin_funcs.cpp b/modules/visual_script/visual_script_builtin_funcs.cpp
index 7e2df23618..5320f99b7c 100644
--- a/modules/visual_script/visual_script_builtin_funcs.cpp
+++ b/modules/visual_script/visual_script_builtin_funcs.cpp
@@ -1180,8 +1180,8 @@ void VisualScriptBuiltinFunc::exec_func(BuiltinFunc p_func, const Variant **p_in
 
 class VisualScriptNodeInstanceBuiltinFunc : public VisualScriptNodeInstance {
 public:
-	VisualScriptBuiltinFunc *node;
-	VisualScriptInstance *instance;
+	VisualScriptBuiltinFunc *node = nullptr;
+	VisualScriptInstance *instance = nullptr;
 
 	VisualScriptBuiltinFunc::BuiltinFunc func;
 
diff --git a/modules/visual_script/visual_script_expression.cpp b/modules/visual_script/visual_script_expression.cpp
index bd36a9ceec..e0f6436094 100644
--- a/modules/visual_script/visual_script_expression.cpp
+++ b/modules/visual_script/visual_script_expression.cpp
@@ -1299,8 +1299,8 @@ bool VisualScriptExpression::_compile_expression() {
 
 class VisualScriptNodeInstanceExpression : public VisualScriptNodeInstance {
 public:
-	VisualScriptInstance *instance;
-	VisualScriptExpression *expression;
+	VisualScriptInstance *instance = nullptr;
+	VisualScriptExpression *expression = nullptr;
 
 	//virtual int get_working_memory_size() const override { return 0; }
 	//execute by parsing the tree directly
diff --git a/modules/visual_script/visual_script_flow_control.cpp b/modules/visual_script/visual_script_flow_control.cpp
index 7946d96b29..0e63753720 100644
--- a/modules/visual_script/visual_script_flow_control.cpp
+++ b/modules/visual_script/visual_script_flow_control.cpp
@@ -119,9 +119,9 @@ void VisualScriptReturn::_bind_methods() {
 
 class VisualScriptNodeInstanceReturn : public VisualScriptNodeInstance {
 public:
-	VisualScriptReturn *node;
-	VisualScriptInstance *instance;
-	bool with_value;
+	VisualScriptReturn *node = nullptr;
+	VisualScriptInstance *instance = nullptr;
+	bool with_value = false;
 
 	virtual int get_working_memory_size() const override { return 1; }
 	//virtual bool is_output_port_unsequenced(int p_idx) const { return false; }
@@ -213,8 +213,8 @@ void VisualScriptCondition::_bind_methods() {
 
 class VisualScriptNodeInstanceCondition : public VisualScriptNodeInstance {
 public:
-	VisualScriptCondition *node;
-	VisualScriptInstance *instance;
+	VisualScriptCondition *node = nullptr;
+	VisualScriptInstance *instance = nullptr;
 
 	//virtual int get_working_memory_size() const override { return 1; }
 	//virtual bool is_output_port_unsequenced(int p_idx) const { return false; }
@@ -293,8 +293,8 @@ void VisualScriptWhile::_bind_methods() {
 
 class VisualScriptNodeInstanceWhile : public VisualScriptNodeInstance {
 public:
-	VisualScriptWhile *node;
-	VisualScriptInstance *instance;
+	VisualScriptWhile *node = nullptr;
+	VisualScriptInstance *instance = nullptr;
 
 	//virtual int get_working_memory_size() const override { return 1; }
 	//virtual bool is_output_port_unsequenced(int p_idx) const { return false; }
@@ -376,8 +376,8 @@ void VisualScriptIterator::_bind_methods() {
 
 class VisualScriptNodeInstanceIterator : public VisualScriptNodeInstance {
 public:
-	VisualScriptIterator *node;
-	VisualScriptInstance *instance;
+	VisualScriptIterator *node = nullptr;
+	VisualScriptInstance *instance = nullptr;
 
 	virtual int get_working_memory_size() const override { return 2; }
 	//virtual bool is_output_port_unsequenced(int p_idx) const { return false; }
@@ -508,9 +508,9 @@ void VisualScriptSequence::_bind_methods() {
 
 class VisualScriptNodeInstanceSequence : public VisualScriptNodeInstance {
 public:
-	VisualScriptSequence *node;
-	VisualScriptInstance *instance;
-	int steps;
+	VisualScriptSequence *node = nullptr;
+	VisualScriptInstance *instance = nullptr;
+	int steps = 0;
 
 	virtual int get_working_memory_size() const override { return 1; }
 	//virtual bool is_output_port_unsequenced(int p_idx) const { return false; }
@@ -596,8 +596,8 @@ String VisualScriptSwitch::get_text() const {
 
 class VisualScriptNodeInstanceSwitch : public VisualScriptNodeInstance {
 public:
-	VisualScriptInstance *instance;
-	int case_count;
+	VisualScriptInstance *instance = nullptr;
+	int case_count = 0;
 
 	//virtual int get_working_memory_size() const override { return 0; }
 	//virtual bool is_output_port_unsequenced(int p_idx) const { return false; }
@@ -774,7 +774,7 @@ VisualScriptTypeCast::TypeGuess VisualScriptTypeCast::guess_output_type(TypeGues
 
 class VisualScriptNodeInstanceTypeCast : public VisualScriptNodeInstance {
 public:
-	VisualScriptInstance *instance;
+	VisualScriptInstance *instance = nullptr;
 	StringName base_type;
 	String script;
 
diff --git a/modules/visual_script/visual_script_func_nodes.cpp b/modules/visual_script/visual_script_func_nodes.cpp
index 5cc9236a9a..483fc8b6c3 100644
--- a/modules/visual_script/visual_script_func_nodes.cpp
+++ b/modules/visual_script/visual_script_func_nodes.cpp
@@ -720,15 +720,15 @@ class VisualScriptNodeInstanceFunctionCall : public VisualScriptNodeInstance {
 public:
 	VisualScriptFunctionCall::CallMode call_mode;
 	NodePath node_path;
-	int input_args;
-	bool validate;
-	int returns;
+	int input_args = 0;
+	bool validate = false;
+	int returns = 0;
 	VisualScriptFunctionCall::RPCCallMode rpc_mode;
 	StringName function;
 	StringName singleton;
 
-	VisualScriptFunctionCall *node;
-	VisualScriptInstance *instance;
+	VisualScriptFunctionCall *node = nullptr;
+	VisualScriptInstance *instance = nullptr;
 
 	//virtual int get_working_memory_size() const override { return 0; }
 	//virtual bool is_output_port_unsequenced(int p_idx) const { return false; }
@@ -1462,11 +1462,11 @@ public:
 	NodePath node_path;
 	StringName property;
 
-	VisualScriptPropertySet *node;
-	VisualScriptInstance *instance;
+	VisualScriptPropertySet *node = nullptr;
+	VisualScriptInstance *instance = nullptr;
 	VisualScriptPropertySet::AssignOp assign_op;
 	StringName index;
-	bool needs_get;
+	bool needs_get = false;
 
 	//virtual int get_working_memory_size() const override { return 0; }
 	//virtual bool is_output_port_unsequenced(int p_idx) const { return false; }
@@ -2152,8 +2152,8 @@ public:
 	StringName property;
 	StringName index;
 
-	VisualScriptPropertyGet *node;
-	VisualScriptInstance *instance;
+	VisualScriptPropertyGet *node = nullptr;
+	VisualScriptInstance *instance = nullptr;
 
 	virtual int step(const Variant **p_inputs, Variant **p_outputs, StartMode p_start_mode, Variant *p_working_mem, Callable::CallError &r_error, String &r_error_str) override {
 		switch (call_mode) {
@@ -2362,9 +2362,9 @@ void VisualScriptEmitSignal::_bind_methods() {
 
 class VisualScriptNodeInstanceEmitSignal : public VisualScriptNodeInstance {
 public:
-	VisualScriptEmitSignal *node;
-	VisualScriptInstance *instance;
-	int argcount;
+	VisualScriptEmitSignal *node = nullptr;
+	VisualScriptInstance *instance = nullptr;
+	int argcount = 0;
 	StringName name;
 
 	//virtual int get_working_memory_size() const override { return 0; }
diff --git a/modules/visual_script/visual_script_nodes.cpp b/modules/visual_script/visual_script_nodes.cpp
index 6e10b72013..dbbe74f3d5 100644
--- a/modules/visual_script/visual_script_nodes.cpp
+++ b/modules/visual_script/visual_script_nodes.cpp
@@ -271,8 +271,8 @@ Multiplayer::RPCMode VisualScriptFunction::get_rpc_mode() const {
 
 class VisualScriptNodeInstanceFunction : public VisualScriptNodeInstance {
 public:
-	VisualScriptFunction *node;
-	VisualScriptInstance *instance;
+	VisualScriptFunction *node = nullptr;
+	VisualScriptInstance *instance = nullptr;
 
 	//virtual int get_working_memory_size() const override { return 0; }
 
@@ -1097,7 +1097,7 @@ void VisualScriptOperator::_bind_methods() {
 
 class VisualScriptNodeInstanceOperator : public VisualScriptNodeInstance {
 public:
-	bool unary;
+	bool unary = false;
 	Variant::Operator op;
 
 	//virtual int get_working_memory_size() const override { return 0; }
@@ -1328,8 +1328,8 @@ void VisualScriptVariableGet::_bind_methods() {
 
 class VisualScriptNodeInstanceVariableGet : public VisualScriptNodeInstance {
 public:
-	VisualScriptVariableGet *node;
-	VisualScriptInstance *instance;
+	VisualScriptVariableGet *node = nullptr;
+	VisualScriptInstance *instance = nullptr;
 	StringName variable;
 
 	virtual int step(const Variant **p_inputs, Variant **p_outputs, StartMode p_start_mode, Variant *p_working_mem, Callable::CallError &r_error, String &r_error_str) override {
@@ -1438,8 +1438,8 @@ void VisualScriptVariableSet::_bind_methods() {
 
 class VisualScriptNodeInstanceVariableSet : public VisualScriptNodeInstance {
 public:
-	VisualScriptVariableSet *node;
-	VisualScriptInstance *instance;
+	VisualScriptVariableSet *node = nullptr;
+	VisualScriptInstance *instance = nullptr;
 	StringName variable;
 
 	//virtual int get_working_memory_size() const override { return 0; }
@@ -1851,8 +1851,7 @@ int VisualScriptGlobalConstant::get_global_constant() {
 
 class VisualScriptNodeInstanceGlobalConstant : public VisualScriptNodeInstance {
 public:
-	int index;
-	//virtual int get_working_memory_size() const override { return 0; }
+	int index = 0;
 
 	virtual int step(const Variant **p_inputs, Variant **p_outputs, StartMode p_start_mode, Variant *p_working_mem, Callable::CallError &r_error, String &r_error_str) override {
 		*p_outputs[0] = CoreConstants::get_global_constant_value(index);
@@ -1963,9 +1962,8 @@ StringName VisualScriptClassConstant::get_base_type() {
 
 class VisualScriptNodeInstanceClassConstant : public VisualScriptNodeInstance {
 public:
-	int value;
-	bool valid;
-	//virtual int get_working_memory_size() const override { return 0; }
+	int value = 0;
+	bool valid = false;
 
 	virtual int step(const Variant **p_inputs, Variant **p_outputs, StartMode p_start_mode, Variant *p_working_mem, Callable::CallError &r_error, String &r_error_str) override {
 		if (!valid) {
@@ -2098,8 +2096,7 @@ Variant::Type VisualScriptBasicTypeConstant::get_basic_type() const {
 class VisualScriptNodeInstanceBasicTypeConstant : public VisualScriptNodeInstance {
 public:
 	Variant value;
-	bool valid;
-	//virtual int get_working_memory_size() const override { return 0; }
+	bool valid = false;
 
 	virtual int step(const Variant **p_inputs, Variant **p_outputs, StartMode p_start_mode, Variant *p_working_mem, Callable::CallError &r_error, String &r_error_str) override {
 		if (!valid) {
@@ -2227,8 +2224,7 @@ VisualScriptMathConstant::MathConstant VisualScriptMathConstant::get_math_consta
 
 class VisualScriptNodeInstanceMathConstant : public VisualScriptNodeInstance {
 public:
-	float value;
-	//virtual int get_working_memory_size() const override { return 0; }
+	float value = 0.0f;
 
 	virtual int step(const Variant **p_inputs, Variant **p_outputs, StartMode p_start_mode, Variant *p_working_mem, Callable::CallError &r_error, String &r_error_str) override {
 		*p_outputs[0] = value;
@@ -2320,7 +2316,7 @@ String VisualScriptEngineSingleton::get_singleton() {
 
 class VisualScriptNodeInstanceEngineSingleton : public VisualScriptNodeInstance {
 public:
-	Object *singleton;
+	Object *singleton = nullptr;
 
 	//virtual int get_working_memory_size() const override { return 0; }
 
@@ -2429,8 +2425,8 @@ NodePath VisualScriptSceneNode::get_node_path() {
 
 class VisualScriptNodeInstanceSceneNode : public VisualScriptNodeInstance {
 public:
-	VisualScriptSceneNode *node;
-	VisualScriptInstance *instance;
+	VisualScriptSceneNode *node = nullptr;
+	VisualScriptInstance *instance = nullptr;
 	NodePath path;
 
 	//virtual int get_working_memory_size() const override { return 0; }
@@ -2610,8 +2606,8 @@ String VisualScriptSceneTree::get_caption() const {
 
 class VisualScriptNodeInstanceSceneTree : public VisualScriptNodeInstance {
 public:
-	VisualScriptSceneTree *node;
-	VisualScriptInstance *instance;
+	VisualScriptSceneTree *node = nullptr;
+	VisualScriptInstance *instance = nullptr;
 
 	//virtual int get_working_memory_size() const override { return 0; }
 
@@ -2779,7 +2775,7 @@ String VisualScriptSelf::get_caption() const {
 
 class VisualScriptNodeInstanceSelf : public VisualScriptNodeInstance {
 public:
-	VisualScriptInstance *instance;
+	VisualScriptInstance *instance = nullptr;
 
 	//virtual int get_working_memory_size() const override { return 0; }
 
@@ -2965,11 +2961,11 @@ String VisualScriptCustomNode::get_category() const {
 
 class VisualScriptNodeInstanceCustomNode : public VisualScriptNodeInstance {
 public:
-	VisualScriptInstance *instance;
-	VisualScriptCustomNode *node;
-	int in_count;
-	int out_count;
-	int work_mem_size;
+	VisualScriptInstance *instance = nullptr;
+	VisualScriptCustomNode *node = nullptr;
+	int in_count = 0;
+	int out_count = 0;
+	int work_mem_size = 0;
 
 	virtual int get_working_memory_size() const override { return work_mem_size; }
 	virtual int step(const Variant **p_inputs, Variant **p_outputs, StartMode p_start_mode, Variant *p_working_mem, Callable::CallError &r_error, String &r_error_str) override {
@@ -3161,10 +3157,10 @@ String VisualScriptSubCall::get_category() const {
 
 class VisualScriptNodeInstanceSubCall : public VisualScriptNodeInstance {
 public:
-	VisualScriptInstance *instance;
-	VisualScriptSubCall *subcall;
-	int input_args;
-	bool valid;
+	VisualScriptInstance *instance = nullptr;
+	VisualScriptSubCall *subcall = nullptr;
+	int input_args = 0;
+	bool valid = false;
 
 	//virtual int get_working_memory_size() const override { return 0; }
 
@@ -3281,7 +3277,7 @@ String VisualScriptComment::get_category() const {
 
 class VisualScriptNodeInstanceComment : public VisualScriptNodeInstance {
 public:
-	VisualScriptInstance *instance;
+	VisualScriptInstance *instance = nullptr;
 
 	//virtual int get_working_memory_size() const override { return 0; }
 
@@ -3380,9 +3376,9 @@ Dictionary VisualScriptConstructor::get_constructor() const {
 
 class VisualScriptNodeInstanceConstructor : public VisualScriptNodeInstance {
 public:
-	VisualScriptInstance *instance;
+	VisualScriptInstance *instance = nullptr;
 	Variant::Type type;
-	int argcount;
+	int argcount = 0;
 
 	//virtual int get_working_memory_size() const override { return 0; }
 
@@ -3497,7 +3493,7 @@ Variant::Type VisualScriptLocalVar::get_var_type() const {
 
 class VisualScriptNodeInstanceLocalVar : public VisualScriptNodeInstance {
 public:
-	VisualScriptInstance *instance;
+	VisualScriptInstance *instance = nullptr;
 	StringName name;
 
 	virtual int get_working_memory_size() const override { return 1; }
@@ -3604,7 +3600,7 @@ Variant::Type VisualScriptLocalVarSet::get_var_type() const {
 
 class VisualScriptNodeInstanceLocalVarSet : public VisualScriptNodeInstance {
 public:
-	VisualScriptInstance *instance;
+	VisualScriptInstance *instance = nullptr;
 	StringName name;
 
 	virtual int get_working_memory_size() const override { return 1; }
@@ -3728,7 +3724,7 @@ VisualScriptInputAction::Mode VisualScriptInputAction::get_action_mode() const {
 
 class VisualScriptNodeInstanceInputAction : public VisualScriptNodeInstance {
 public:
-	VisualScriptInstance *instance;
+	VisualScriptInstance *instance = nullptr;
 	StringName action;
 	VisualScriptInputAction::Mode mode;
 
@@ -3906,7 +3902,7 @@ Array VisualScriptDeconstruct::_get_elem_cache() const {
 
 class VisualScriptNodeInstanceDeconstruct : public VisualScriptNodeInstance {
 public:
-	VisualScriptInstance *instance;
+	VisualScriptInstance *instance = nullptr;
 	Vector<StringName> outputs;
 
 	//virtual int get_working_memory_size() const override { return 0; }
diff --git a/modules/visual_script/visual_script_yield_nodes.cpp b/modules/visual_script/visual_script_yield_nodes.cpp
index e6e7f79d1f..96e91a0baf 100644
--- a/modules/visual_script/visual_script_yield_nodes.cpp
+++ b/modules/visual_script/visual_script_yield_nodes.cpp
@@ -93,7 +93,7 @@ String VisualScriptYield::get_text() const {
 class VisualScriptNodeInstanceYield : public VisualScriptNodeInstance {
 public:
 	VisualScriptYield::YieldMode mode;
-	double wait_time;
+	double wait_time = 0.0;
 
 	virtual int get_working_memory_size() const override { return 1; } //yield needs at least 1
 	//virtual bool is_output_port_unsequenced(int p_idx) const { return false; }
@@ -500,11 +500,11 @@ class VisualScriptNodeInstanceYieldSignal : public VisualScriptNodeInstance {
 public:
 	VisualScriptYieldSignal::CallMode call_mode;
 	NodePath node_path;
-	int output_args;
+	int output_args = 0;
 	StringName signal;
 
-	VisualScriptYieldSignal *node;
-	VisualScriptInstance *instance;
+	VisualScriptYieldSignal *node = nullptr;
+	VisualScriptInstance *instance = nullptr;
 
 	virtual int get_working_memory_size() const override { return 1; }
 	//virtual bool is_output_port_unsequenced(int p_idx) const { return false; }
diff --git a/modules/websocket/wsl_client.h b/modules/websocket/wsl_client.h
index 22b3a4f373..04af83f28c 100644
--- a/modules/websocket/wsl_client.h
+++ b/modules/websocket/wsl_client.h
@@ -63,7 +63,7 @@ private:
 
 	String _key;
 	String _host;
-	uint16_t _port;
+	uint16_t _port = 0;
 	Array _ip_candidates;
 	Vector<String> _protocols;
 	bool _use_ssl = false;