4485b43a57
- Based on C++11's `atomic` - Reworked `SafeRefCount` (based on the rewrite by @hpvb) - Replaced free atomic functions by the new `SafeNumeric<T>` - Replaced wrong cases of `volatile` by the new `SafeFlag` - Platform-specific implementations no longer needed Co-authored-by: Hein-Pieter van Braam-Stewart <hp@tmm.cx>
384 lines
9.1 KiB
C++
384 lines
9.1 KiB
C++
/*************************************************************************/
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/* cowdata.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) 2007-2021 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2021 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 COWDATA_H_
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#define COWDATA_H_
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#include <string.h>
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#include "core/error_macros.h"
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#include "core/os/memory.h"
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#include "core/safe_refcount.h"
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template <class T>
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class Vector;
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class String;
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class CharString;
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template <class T, class V>
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class VMap;
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// CowData is relying on this to be true
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static_assert(sizeof(SafeNumeric<uint32_t>) == sizeof(uint32_t), "");
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template <class T>
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class CowData {
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template <class TV>
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friend class Vector;
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friend class String;
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friend class CharString;
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template <class TV, class VV>
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friend class VMap;
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private:
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mutable T *_ptr;
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// internal helpers
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_FORCE_INLINE_ SafeNumeric<uint32_t> *_get_refcount() const {
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if (!_ptr)
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return NULL;
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return reinterpret_cast<SafeNumeric<uint32_t> *>(_ptr) - 2;
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}
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_FORCE_INLINE_ uint32_t *_get_size() const {
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if (!_ptr)
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return NULL;
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return reinterpret_cast<uint32_t *>(_ptr) - 1;
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}
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_FORCE_INLINE_ T *_get_data() const {
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if (!_ptr)
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return NULL;
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return reinterpret_cast<T *>(_ptr);
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}
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_FORCE_INLINE_ size_t _get_alloc_size(size_t p_elements) const {
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//return nearest_power_of_2_templated(p_elements*sizeof(T)+sizeof(SafeRefCount)+sizeof(int));
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return next_power_of_2(p_elements * sizeof(T));
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}
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_FORCE_INLINE_ bool _get_alloc_size_checked(size_t p_elements, size_t *out) const {
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#if defined(_add_overflow) && defined(_mul_overflow)
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size_t o;
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size_t p;
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if (_mul_overflow(p_elements, sizeof(T), &o)) {
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*out = 0;
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return false;
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}
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*out = next_power_of_2(o);
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if (_add_overflow(o, static_cast<size_t>(32), &p)) return false; //no longer allocated here
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return true;
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#else
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// Speed is more important than correctness here, do the operations unchecked
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// and hope the best
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*out = _get_alloc_size(p_elements);
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return true;
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#endif
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}
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void _unref(void *p_data);
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void _ref(const CowData *p_from);
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void _ref(const CowData &p_from);
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void _copy_on_write();
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public:
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void operator=(const CowData<T> &p_from) { _ref(p_from); }
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_FORCE_INLINE_ T *ptrw() {
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_copy_on_write();
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return (T *)_get_data();
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}
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_FORCE_INLINE_ const T *ptr() const {
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return _get_data();
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}
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_FORCE_INLINE_ int size() const {
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uint32_t *size = (uint32_t *)_get_size();
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if (size)
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return *size;
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else
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return 0;
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}
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_FORCE_INLINE_ void clear() { resize(0); }
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_FORCE_INLINE_ bool empty() const { return _ptr == 0; }
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_FORCE_INLINE_ void set(int p_index, const T &p_elem) {
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CRASH_BAD_INDEX(p_index, size());
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_copy_on_write();
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_get_data()[p_index] = p_elem;
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}
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_FORCE_INLINE_ T &get_m(int p_index) {
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CRASH_BAD_INDEX(p_index, size());
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_copy_on_write();
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return _get_data()[p_index];
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}
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_FORCE_INLINE_ const T &get(int p_index) const {
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CRASH_BAD_INDEX(p_index, size());
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return _get_data()[p_index];
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}
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Error resize(int p_size);
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_FORCE_INLINE_ void remove(int p_index) {
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ERR_FAIL_INDEX(p_index, size());
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T *p = ptrw();
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int len = size();
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for (int i = p_index; i < len - 1; i++) {
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p[i] = p[i + 1];
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};
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resize(len - 1);
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};
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Error insert(int p_pos, const T &p_val) {
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ERR_FAIL_INDEX_V(p_pos, size() + 1, ERR_INVALID_PARAMETER);
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resize(size() + 1);
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for (int i = (size() - 1); i > p_pos; i--)
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set(i, get(i - 1));
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set(p_pos, p_val);
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return OK;
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};
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int find(const T &p_val, int p_from = 0) const;
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_FORCE_INLINE_ CowData();
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_FORCE_INLINE_ ~CowData();
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_FORCE_INLINE_ CowData(CowData<T> &p_from) { _ref(p_from); };
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};
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template <class T>
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void CowData<T>::_unref(void *p_data) {
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if (!p_data)
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return;
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SafeNumeric<uint32_t> *refc = _get_refcount();
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if (refc->decrement() > 0)
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return; // still in use
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// clean up
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if (!__has_trivial_destructor(T)) {
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uint32_t *count = _get_size();
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T *data = (T *)(count + 1);
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for (uint32_t i = 0; i < *count; ++i) {
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// call destructors
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data[i].~T();
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}
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}
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// free mem
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Memory::free_static((uint8_t *)p_data, true);
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}
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template <class T>
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void CowData<T>::_copy_on_write() {
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if (!_ptr)
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return;
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SafeNumeric<uint32_t> *refc = _get_refcount();
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if (unlikely(refc->get() > 1)) {
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/* in use by more than me */
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uint32_t current_size = *_get_size();
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uint32_t *mem_new = (uint32_t *)Memory::alloc_static(_get_alloc_size(current_size), true);
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reinterpret_cast<SafeNumeric<uint32_t> *>(mem_new - 2)->set(1); //refcount
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*(mem_new - 1) = current_size; //size
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T *_data = (T *)(mem_new);
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// initialize new elements
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if (__has_trivial_copy(T)) {
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memcpy(mem_new, _ptr, current_size * sizeof(T));
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} else {
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for (uint32_t i = 0; i < current_size; i++) {
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memnew_placement(&_data[i], T(_get_data()[i]));
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}
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}
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_unref(_ptr);
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_ptr = _data;
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}
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}
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template <class T>
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Error CowData<T>::resize(int p_size) {
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ERR_FAIL_COND_V(p_size < 0, ERR_INVALID_PARAMETER);
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int current_size = size();
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if (p_size == current_size)
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return OK;
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if (p_size == 0) {
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// wants to clean up
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_unref(_ptr);
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_ptr = NULL;
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return OK;
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}
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// possibly changing size, copy on write
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_copy_on_write();
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size_t current_alloc_size = _get_alloc_size(current_size);
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size_t alloc_size;
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ERR_FAIL_COND_V(!_get_alloc_size_checked(p_size, &alloc_size), ERR_OUT_OF_MEMORY);
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if (p_size > current_size) {
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if (alloc_size != current_alloc_size) {
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if (current_size == 0) {
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// alloc from scratch
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uint32_t *ptr = (uint32_t *)Memory::alloc_static(alloc_size, true);
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ERR_FAIL_COND_V(!ptr, ERR_OUT_OF_MEMORY);
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*(ptr - 1) = 0; //size, currently none
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reinterpret_cast<SafeNumeric<uint32_t> *>(ptr - 2)->set(1); //refcount
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_ptr = (T *)ptr;
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} else {
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void *_ptrnew = (T *)Memory::realloc_static(_ptr, alloc_size, true);
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ERR_FAIL_COND_V(!_ptrnew, ERR_OUT_OF_MEMORY);
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_ptr = (T *)(_ptrnew);
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}
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}
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// construct the newly created elements
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if (!__has_trivial_constructor(T)) {
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T *elems = _get_data();
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for (int i = *_get_size(); i < p_size; i++) {
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memnew_placement(&elems[i], T);
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}
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}
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*_get_size() = p_size;
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} else if (p_size < current_size) {
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if (!__has_trivial_destructor(T)) {
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// deinitialize no longer needed elements
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for (uint32_t i = p_size; i < *_get_size(); i++) {
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T *t = &_get_data()[i];
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t->~T();
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}
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}
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if (alloc_size != current_alloc_size) {
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void *_ptrnew = (T *)Memory::realloc_static(_ptr, alloc_size, true);
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ERR_FAIL_COND_V(!_ptrnew, ERR_OUT_OF_MEMORY);
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_ptr = (T *)(_ptrnew);
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}
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*_get_size() = p_size;
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}
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return OK;
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}
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template <class T>
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int CowData<T>::find(const T &p_val, int p_from) const {
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int ret = -1;
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if (p_from < 0 || size() == 0) {
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return ret;
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}
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for (int i = p_from; i < size(); i++) {
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if (get(i) == p_val) {
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ret = i;
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break;
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}
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}
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return ret;
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}
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template <class T>
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void CowData<T>::_ref(const CowData *p_from) {
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_ref(*p_from);
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}
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template <class T>
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void CowData<T>::_ref(const CowData &p_from) {
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if (_ptr == p_from._ptr)
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return; // self assign, do nothing.
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_unref(_ptr);
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_ptr = NULL;
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if (!p_from._ptr)
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return; //nothing to do
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if (p_from._get_refcount()->increment() > 0) { // could reference
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_ptr = p_from._ptr;
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}
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}
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template <class T>
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CowData<T>::CowData() {
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_ptr = NULL;
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}
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template <class T>
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CowData<T>::~CowData() {
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_unref(_ptr);
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}
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#endif /* COW_H_ */
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