initial commit, 4.5 stable

core/object/ref_counted.cpp

@@ -0,0 +1,129 @@
+/**************************************************************************/
+/*  ref_counted.cpp                                                       */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#include "ref_counted.h"
+
+#include "core/object/script_language.h"
+
+bool RefCounted::init_ref() {
+	if (reference()) {
+		if (!is_referenced() && refcount_init.unref()) {
+			unreference(); // first referencing is already 1, so compensate for the ref above
+		}
+
+		return true;
+	} else {
+		return false;
+	}
+}
+
+void RefCounted::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("init_ref"), &RefCounted::init_ref);
+	ClassDB::bind_method(D_METHOD("reference"), &RefCounted::reference);
+	ClassDB::bind_method(D_METHOD("unreference"), &RefCounted::unreference);
+	ClassDB::bind_method(D_METHOD("get_reference_count"), &RefCounted::get_reference_count);
+}
+
+int RefCounted::get_reference_count() const {
+	return refcount.get();
+}
+
+bool RefCounted::reference() {
+	uint32_t rc_val = refcount.refval();
+	bool success = rc_val != 0;
+
+	if (success && rc_val <= 2 /* higher is not relevant */) {
+		if (get_script_instance()) {
+			get_script_instance()->refcount_incremented();
+		}
+		if (_get_extension() && _get_extension()->reference) {
+			_get_extension()->reference(_get_extension_instance());
+		}
+
+		_instance_binding_reference(true);
+	}
+
+	return success;
+}
+
+bool RefCounted::unreference() {
+	uint32_t rc_val = refcount.unrefval();
+	bool die = rc_val == 0;
+
+	if (rc_val <= 1 /* higher is not relevant */) {
+		if (get_script_instance()) {
+			bool script_ret = get_script_instance()->refcount_decremented();
+			die = die && script_ret;
+		}
+		if (_get_extension() && _get_extension()->unreference) {
+			_get_extension()->unreference(_get_extension_instance());
+		}
+
+		bool binding_ret = _instance_binding_reference(false);
+		die = die && binding_ret;
+	}
+
+	return die;
+}
+
+RefCounted::RefCounted() :
+		Object(true) {
+	refcount.init();
+	refcount_init.init();
+}
+
+Variant WeakRef::get_ref() const {
+	if (ref.is_null()) {
+		return Variant();
+	}
+
+	Object *obj = ObjectDB::get_instance(ref);
+	if (!obj) {
+		return Variant();
+	}
+	RefCounted *r = cast_to<RefCounted>(obj);
+	if (r) {
+		return Ref<RefCounted>(r);
+	}
+
+	return obj;
+}
+
+void WeakRef::set_obj(Object *p_object) {
+	ref = p_object ? p_object->get_instance_id() : ObjectID();
+}
+
+void WeakRef::set_ref(const Ref<RefCounted> &p_ref) {
+	ref = p_ref.is_valid() ? p_ref->get_instance_id() : ObjectID();
+}
+
+void WeakRef::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("get_ref"), &WeakRef::get_ref);
+}