Fix many asan and ubsan reported issues

This allows most demos to run without any ubsan or asan errors. There
are still some things in thirdpart/ and some things in AudioServer that
needs a look but this fixes a lot of issues. This should help debug less
obvious issues, hopefully.

This fixes #25217 and fixes #25218

4 files changed, 18 insertions, 2 deletions

diff --git a/modules/gdscript/gdscript_editor.cpp b/modules/gdscript/gdscript_editor.cpp
index 08ad101967..3daa006353 100644
--- a/modules/gdscript/gdscript_editor.cpp
+++ b/modules/gdscript/gdscript_editor.cpp
@@ -615,6 +615,9 @@ static GDScriptCompletionIdentifier _type_from_gdtype(const GDScriptDataType &p_
 	ci.type.script_type = p_gdtype.script_type;
 
 	switch (p_gdtype.kind) {
+		case GDScriptDataType::UNINITIALIZED: {
+			ERR_EXPLAIN("Uninitialized completion. Please report a bug.");
+		} break;
 		case GDScriptDataType::BUILTIN: {
 			ci.type.kind = GDScriptParser::DataType::BUILTIN;
 		} break;
diff --git a/modules/gdscript/gdscript_function.h b/modules/gdscript/gdscript_function.h
index f4058664ff..a412b2950f 100644
--- a/modules/gdscript/gdscript_function.h
+++ b/modules/gdscript/gdscript_function.h
@@ -45,10 +45,11 @@ class GDScript;
 struct GDScriptDataType {
 	bool has_type;
 	enum {
+		UNINITIALIZED,
 		BUILTIN,
 		NATIVE,
 		SCRIPT,
-		GDSCRIPT
+		GDSCRIPT,
 	} kind;
 	Variant::Type builtin_type;
 	StringName native_type;
@@ -58,6 +59,8 @@ struct GDScriptDataType {
 		if (!has_type) return true; // Can't type check
 
 		switch (kind) {
+			case UNINITIALIZED:
+				break;
 			case BUILTIN: {
 				Variant::Type var_type = p_variant.get_type();
 				bool valid = builtin_type == var_type;
@@ -113,6 +116,8 @@ struct GDScriptDataType {
 		PropertyInfo info;
 		if (has_type) {
 			switch (kind) {
+				case UNINITIALIZED:
+					break;
 				case BUILTIN: {
 					info.type = builtin_type;
 				} break;
@@ -134,7 +139,9 @@ struct GDScriptDataType {
 	}
 
 	GDScriptDataType() :
-			has_type(false) {}
+			has_type(false),
+			kind(UNINITIALIZED),
+			builtin_type(Variant::NIL) {}
 };
 
 class GDScriptFunction {
diff --git a/modules/gdscript/gdscript_parser.cpp b/modules/gdscript/gdscript_parser.cpp
index af189fdb7e..77ae17e573 100644
--- a/modules/gdscript/gdscript_parser.cpp
+++ b/modules/gdscript/gdscript_parser.cpp
@@ -4553,6 +4553,7 @@ void GDScriptParser::_parse_class(ClassNode *p_class) {
 				//variale declaration and (eventual) initialization
 
 				ClassNode::Member member;
+
 				bool autoexport = tokenizer->get_token(-1) == GDScriptTokenizer::TK_PR_EXPORT;
 				if (current_export.type != Variant::NIL) {
 					member._export = current_export;
@@ -5594,6 +5595,9 @@ GDScriptParser::DataType GDScriptParser::_type_from_gdtype(const GDScriptDataTyp
 	result.script_type = p_gdtype.script_type;
 
 	switch (p_gdtype.kind) {
+		case GDScriptDataType::UNINITIALIZED: {
+			ERR_EXPLAIN("Uninitialized datatype. Please report a bug.");
+		} break;
 		case GDScriptDataType::BUILTIN: {
 			result.kind = DataType::BUILTIN;
 		} break;
diff --git a/modules/gdscript/gdscript_parser.h b/modules/gdscript/gdscript_parser.h
index b4a705c9e7..d1ddf9aa12 100644
--- a/modules/gdscript/gdscript_parser.h
+++ b/modules/gdscript/gdscript_parser.h
@@ -95,6 +95,7 @@ public:
 		}
 
 		DataType() :
+				kind(UNRESOLVED),
 				has_type(false),
 				is_constant(false),
 				is_meta_type(false),
@@ -168,6 +169,7 @@ public:
 			MultiplayerAPI::RPCMode rpc_mode;
 			int usages;
 		};
+
 		struct Constant {
 			Node *expression;
 			DataType type;