[3.x] GDScript: Fix `get_method_list` for custom functions

modules/gdscript/gdscript.cpp

@@ -223,11 +223,15 @@ void GDScript::get_script_method_list(List<MethodInfo> *p_list) const {
 			GDScriptFunction *func = E->get();
 			MethodInfo mi;
 			mi.name = E->key();
+			mi.return_val = func->get_return_type();
 			for (int i = 0; i < func->get_argument_count(); i++) {
-				mi.arguments.push_back(func->get_argument_type(i));
+				PropertyInfo arginfo = func->get_argument_type(i);
+				arginfo.name = func->get_argument_name(i);
+				mi.arguments.push_back(arginfo);
+			}
+			for (int i = 0; i < func->get_default_argument_count(); i++) {
+				mi.default_arguments.push_back(func->get_default_argument_value(i));
 			}
-
-			mi.return_val = func->get_return_type();
 			p_list->push_back(mi);
 		}
 
@@ -276,11 +280,15 @@ MethodInfo GDScript::get_method_info(const StringName &p_method) const {
 	GDScriptFunction *func = E->get();
 	MethodInfo mi;
 	mi.name = E->key();
+	mi.return_val = func->get_return_type();
 	for (int i = 0; i < func->get_argument_count(); i++) {
-		mi.arguments.push_back(func->get_argument_type(i));
+		PropertyInfo arginfo = func->get_argument_type(i);
+		arginfo.name = func->get_argument_name(i);
+		mi.arguments.push_back(arginfo);
+	}
+	for (int i = 0; i < func->get_default_argument_count(); i++) {
+		mi.default_arguments.push_back(func->get_default_argument_value(i));
 	}
-
-	mi.return_val = func->get_return_type();
 	return mi;
 }
 
@@ -1166,11 +1174,18 @@ void GDScriptInstance::get_method_list(List<MethodInfo> *p_list) const {
 	const GDScript *sptr = script.ptr();
 	while (sptr) {
 		for (Map<StringName, GDScriptFunction *>::Element *E = sptr->member_functions.front(); E; E = E->next()) {
+			GDScriptFunction *func = E->get();
 			MethodInfo mi;
 			mi.name = E->key();
+			mi.return_val = func->get_return_type();
 			mi.flags |= METHOD_FLAG_FROM_SCRIPT;
 			for (int i = 0; i < E->get()->get_argument_count(); i++) {
-				mi.arguments.push_back(PropertyInfo(Variant::NIL, "arg" + itos(i)));
+				PropertyInfo arginfo = func->get_argument_type(i);
+				arginfo.name = func->get_argument_name(i);
+				mi.arguments.push_back(arginfo);
+			}
+			for (int i = 0; i < func->get_default_argument_count(); i++) {
+				mi.default_arguments.push_back(func->get_default_argument_value(i));
 			}
 			p_list->push_back(mi);
 		}

modules/gdscript/gdscript_compiler.cpp

@@ -1628,7 +1628,10 @@ Error GDScriptCompiler::_parse_function(GDScript *p_script, const GDScriptParser
 	codegen.current_line = 0;
 	codegen.call_max = 0;
 	codegen.debug_stack = ScriptDebugger::get_singleton() != nullptr;
+#ifdef TOOLS_ENABLED
 	Vector<StringName> argnames;
+	Vector<Variant> default_arg_values;
+#endif
 
 	int stack_level = 0;
 
@@ -1693,6 +1696,15 @@ Error GDScriptCompiler::_parse_function(GDScript *p_script, const GDScriptParser
 			for (int i = 0; i < p_func->default_values.size(); i++) {
 				_parse_expression(codegen, p_func->default_values[i], stack_level, true);
 				defarg_addr.push_back(codegen.opcodes.size());
+#ifdef TOOLS_ENABLED
+				const GDScriptParser::OperatorNode *assign = static_cast<const GDScriptParser::OperatorNode *>(p_func->default_values[i]);
+				if (assign->arguments.size() >= 2 && assign->arguments[1]->type == GDScriptParser::Node::TYPE_CONSTANT) {
+					const GDScriptParser::ConstantNode *cn = static_cast<const GDScriptParser::ConstantNode *>(assign->arguments[1]);
+					default_arg_values.push_back(cn->value);
+				} else {
+					default_arg_values.push_back(Variant());
+				}
+#endif
 			}
 
 			defarg_addr.invert();
@@ -1742,6 +1754,7 @@ Error GDScriptCompiler::_parse_function(GDScript *p_script, const GDScriptParser
 
 #ifdef TOOLS_ENABLED
 	gdfunc->arg_names = argnames;
+	gdfunc->default_arg_values = default_arg_values;
 #endif
 	//constants
 	if (codegen.constant_map.size()) {

modules/gdscript/gdscript_function.h

@@ -264,6 +264,7 @@ private:
 
 #ifdef TOOLS_ENABLED
 	Vector<StringName> arg_names;
+	Vector<Variant> default_arg_values;
 #endif
 
 	List<StackDebug> stack_debug;
@@ -336,12 +337,16 @@ public:
 		ERR_FAIL_INDEX_V(p_idx, arg_names.size(), StringName());
 		return arg_names[p_idx];
 #else
-		return StringName();
+		return StringName("arg" + itos(p_idx));
 #endif
 	}
-	Variant get_default_argument(int p_idx) const {
-		ERR_FAIL_INDEX_V(p_idx, default_arguments.size(), Variant());
-		return default_arguments[p_idx];
+	Variant get_default_argument_value(int p_idx) const {
+#ifdef TOOLS_ENABLED
+		ERR_FAIL_INDEX_V(p_idx, default_arg_values.size(), Variant());
+		return default_arg_values[p_idx];
+#else
+		return Variant();
+#endif
 	}
 
 	Variant call(GDScriptInstance *p_instance, const Variant **p_args, int p_argcount, Variant::CallError &r_err, CallState *p_state = nullptr);