150 lines
4.7 KiB
C++
150 lines
4.7 KiB
C++
/*************************************************************************/
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/* reference.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md) */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "reference.h"
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#include "core/script_language.h"
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bool Reference::init_ref() {
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if (reference()) {
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// this may fail in the scenario of two threads assigning the pointer for the FIRST TIME
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// at the same time, which is never likely to happen (would be crazy to do)
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// so don't do it.
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if (refcount_init.get() > 0) {
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refcount_init.unref();
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unreference(); // first referencing is already 1, so compensate for the ref above
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}
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return true;
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} else {
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return false;
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}
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}
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void Reference::_bind_methods() {
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ClassDB::bind_method(D_METHOD("init_ref"), &Reference::init_ref);
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ClassDB::bind_method(D_METHOD("reference"), &Reference::reference);
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ClassDB::bind_method(D_METHOD("unreference"), &Reference::unreference);
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}
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int Reference::reference_get_count() const {
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return refcount.get();
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}
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bool Reference::reference() {
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bool success = refcount.ref();
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if (success && refcount.get() <= 2 /* higher is not relevant */) {
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if (get_script_instance()) {
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get_script_instance()->refcount_incremented();
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}
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if (instance_binding_count > 0 && !ScriptServer::are_languages_finished()) {
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for (int i = 0; i < MAX_SCRIPT_INSTANCE_BINDINGS; i++) {
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if (_script_instance_bindings[i]) {
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ScriptServer::get_language(i)->refcount_incremented_instance_binding(this);
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}
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}
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}
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}
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return success;
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}
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bool Reference::unreference() {
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bool die = refcount.unref();
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if (refcount.get() <= 1 /* higher is not relevant */) {
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if (get_script_instance()) {
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bool script_ret = get_script_instance()->refcount_decremented();
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die = die && script_ret;
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}
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if (instance_binding_count > 0 && !ScriptServer::are_languages_finished()) {
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for (int i = 0; i < MAX_SCRIPT_INSTANCE_BINDINGS; i++) {
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if (_script_instance_bindings[i]) {
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bool script_ret = ScriptServer::get_language(i)->refcount_decremented_instance_binding(this);
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die = die && script_ret;
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}
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}
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}
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}
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return die;
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}
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Reference::Reference() {
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refcount.init();
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refcount_init.init();
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}
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Reference::~Reference() {
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}
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Variant WeakRef::get_ref() const {
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if (ref == 0)
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return Variant();
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Object *obj = ObjectDB::get_instance(ref);
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if (!obj)
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return Variant();
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Reference *r = cast_to<Reference>(obj);
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if (r) {
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return REF(r);
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}
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return obj;
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}
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void WeakRef::set_obj(Object *p_object) {
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ref = p_object ? p_object->get_instance_id() : 0;
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}
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void WeakRef::set_ref(const REF &p_ref) {
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ref = p_ref.is_valid() ? p_ref->get_instance_id() : 0;
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}
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WeakRef::WeakRef() :
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ref(0) {
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}
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void WeakRef::_bind_methods() {
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ClassDB::bind_method(D_METHOD("get_ref"), &WeakRef::get_ref);
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}
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