ac8b4708a3
This moves the instance id member from Variant to the ObjectRC so that Variant is still the same size as before the fix (and also regardless if debug or release build).
82 lines
3.3 KiB
C++
82 lines
3.3 KiB
C++
/*************************************************************************/
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/* object_rc.h */
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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) 2007-2020 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2020 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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#ifndef OBJECTRC_H
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#define OBJECTRC_H
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#ifdef DEBUG_ENABLED
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#include "core/os/memory.h"
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#include "core/typedefs.h"
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#include <atomic>
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class Object;
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// Used to track Variants pointing to a non-Reference Object
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class ObjectRC {
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std::atomic<Object *> _ptr;
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std::atomic<uint32_t> _users;
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public:
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// This is for allowing debug builds to check for instance ID validity,
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// so warnings are shown in debug builds when a stray Variant (one pointing
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// to a released Object) would have happened.
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const ObjectID instance_id;
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_FORCE_INLINE_ void increment() {
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_users.fetch_add(1, std::memory_order_relaxed);
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}
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_FORCE_INLINE_ bool decrement() {
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return _users.fetch_sub(1, std::memory_order_relaxed) == 1;
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}
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_FORCE_INLINE_ bool invalidate() {
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_ptr.store(nullptr, std::memory_order_release);
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return decrement();
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}
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_FORCE_INLINE_ Object *get_ptr() {
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return _ptr.load(std::memory_order_acquire);
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}
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_FORCE_INLINE_ ObjectRC(Object *p_object) :
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instance_id(p_object->get_instance_id()) {
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// 1 (the Object) + 1 (the first user)
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_users.store(2, std::memory_order_relaxed);
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_ptr.store(p_object, std::memory_order_release);
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}
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};
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#endif
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#endif
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