Fix inheriting from class_name messing up constants

Fixes #29586

2 files changed, 15 insertions, 10 deletions

diff --git a/modules/gdscript/gdscript_parser.cpp b/modules/gdscript/gdscript_parser.cpp
index 9ab86a5459..67b790bd52 100644
--- a/modules/gdscript/gdscript_parser.cpp
+++ b/modules/gdscript/gdscript_parser.cpp
@@ -826,11 +826,12 @@ GDScriptParser::Node *GDScriptParser::_parse_expression(Node *p_parent, bool p_s
 					}
 
 					// Check parents for the constant
-					if (!bfn && cln->extends_file != StringName()) {
-						Ref<GDScript> parent = ResourceLoader::load(cln->extends_file);
-						if (parent.is_valid() && parent->is_valid()) {
+					if (!bfn) {
+						// Using current_class instead of cln here, since cln is const*
+						_determine_inheritance(current_class, false);
+						if (cln->base_type.has_type && cln->base_type.kind == DataType::GDSCRIPT && cln->base_type.script_type->is_valid()) {
 							Map<StringName, Variant> parent_constants;
-							parent->get_constants(&parent_constants);
+							current_class->base_type.script_type->get_constants(&parent_constants);
 							if (parent_constants.has(identifier)) {
 								ConstantNode *constant = alloc_node<ConstantNode>();
 								constant->value = parent_constants[identifier];
@@ -5158,9 +5159,11 @@ void GDScriptParser::_parse_class(ClassNode *p_class) {
 	}
 }
 
-void GDScriptParser::_determine_inheritance(ClassNode *p_class) {
+void GDScriptParser::_determine_inheritance(ClassNode *p_class, bool p_recursive) {
 
-	if (p_class->extends_used) {
+	if (p_class->base_type.has_type) {
+		// Already determined
+	} else if (p_class->extends_used) {
 		//do inheritance
 		String path = p_class->extends_file;
 
@@ -5355,9 +5358,11 @@ void GDScriptParser::_determine_inheritance(ClassNode *p_class) {
 		p_class->base_type.native_type = "Reference";
 	}
 
-	// Recursively determine subclasses
-	for (int i = 0; i < p_class->subclasses.size(); i++) {
-		_determine_inheritance(p_class->subclasses[i]);
+	if (p_recursive) {
+		// Recursively determine subclasses
+		for (int i = 0; i < p_class->subclasses.size(); i++) {
+			_determine_inheritance(p_class->subclasses[i], p_recursive);
+		}
 	}
 }
 
diff --git a/modules/gdscript/gdscript_parser.h b/modules/gdscript/gdscript_parser.h
index 5e4de11357..0bed4cb0a5 100644
--- a/modules/gdscript/gdscript_parser.h
+++ b/modules/gdscript/gdscript_parser.h
@@ -599,7 +599,7 @@ private:
 	void _parse_class(ClassNode *p_class);
 	bool _end_statement();
 
-	void _determine_inheritance(ClassNode *p_class);
+	void _determine_inheritance(ClassNode *p_class, bool p_recursive = true);
 	bool _parse_type(DataType &r_type, bool p_can_be_void = false);
 	DataType _resolve_type(const DataType &p_source, int p_line);
 	DataType _type_from_variant(const Variant &p_value) const;