Add is_instance_valid() method to GDScript, ending more than a decade of pain.

core/object.cpp

@@ -1919,9 +1919,7 @@ ObjectID ObjectDB::add_instance(Object *p_object) {
 
 	rw_lock->write_lock();
 	instances[++instance_counter] = p_object;
-#ifdef DEBUG_ENABLED
 	instance_checks[p_object] = instance_counter;
-#endif
 	rw_lock->write_unlock();
 
 	return instance_counter;
@@ -1932,9 +1930,7 @@ void ObjectDB::remove_instance(Object *p_object) {
 	rw_lock->write_lock();
 
 	instances.erase(p_object->get_instance_id());
-#ifdef DEBUG_ENABLED
 	instance_checks.erase(p_object);
-#endif
 
 	rw_lock->write_unlock();
 }

core/object.h

@@ -762,15 +762,10 @@ public:
 	static void debug_objects(DebugFunc p_func);
 	static int get_object_count();
 
-#ifdef DEBUG_ENABLED
 	_FORCE_INLINE_ static bool instance_validate(Object *p_ptr) {
 
 		return instance_checks.has(p_ptr);
 	}
-#else
-	_FORCE_INLINE_ static bool instance_validate(Object *p_ptr) { return true; }
-
-#endif
 };
 
 //needed by macros

modules/gdscript/gdscript_functions.cpp

@@ -122,6 +122,7 @@ const char *GDScriptFunctions::get_func_name(Function p_func) {
 		"print_stack",
 		"instance_from_id",
 		"len",
+		"is_instance_valid",
 	};
 
 	return _names[p_func];
@@ -1277,6 +1278,17 @@ void GDScriptFunctions::call(Function p_func, const Variant **p_args, int p_arg_
 			}
 
 		} break;
+		case IS_INSTANCE_VALID: {
+
+			VALIDATE_ARG_COUNT(1);
+			if (p_args[0]->get_type() != Variant::OBJECT) {
+				r_ret = false;
+			} else {
+				Object *obj = *p_args[0];
+				r_ret = ObjectDB::instance_validate(obj);
+			}
+
+		} break;
 		case FUNC_MAX: {
 
 			ERR_FAIL();
@@ -1798,7 +1810,11 @@ MethodInfo GDScriptFunctions::get_info(Function p_func) {
 			mi.return_val.type = Variant::INT;
 			return mi;
 		} break;
-
+		case IS_INSTANCE_VALID: {
+			MethodInfo mi("is_instance_valid", PropertyInfo(Variant::OBJECT, "instance"));
+			mi.return_val.type = Variant::BOOL;
+			return mi;
+		} break;
 		case FUNC_MAX: {
 
 			ERR_FAIL_V(MethodInfo());

modules/gdscript/gdscript_functions.h

@@ -113,6 +113,7 @@ public:
 		PRINT_STACK,
 		INSTANCE_FROM_ID,
 		LEN,
+		IS_INSTANCE_VALID,
 		FUNC_MAX
 
 	};