d95794ec8a
As many open source projects have started doing it, we're removing the current year from the copyright notice, so that we don't need to bump it every year. It seems like only the first year of publication is technically relevant for copyright notices, and even that seems to be something that many companies stopped listing altogether (in a version controlled codebase, the commits are a much better source of date of publication than a hardcoded copyright statement). We also now list Godot Engine contributors first as we're collectively the current maintainers of the project, and we clarify that the "exclusive" copyright of the co-founders covers the timespan before opensourcing (their further contributions are included as part of Godot Engine contributors). Also fixed "cf." Frenchism - it's meant as "refer to / see".
419 lines
10 KiB
C++
419 lines
10 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) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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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 "core/error/error_macros.h"
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#include "core/os/memory.h"
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#include "core/templates/safe_refcount.h"
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#include <string.h>
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#include <type_traits>
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template <class T>
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class Vector;
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class String;
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class Char16String;
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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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SAFE_NUMERIC_TYPE_PUN_GUARANTEES(uint32_t)
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// Silence a false positive warning (see GH-52119).
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#if defined(__GNUC__) && !defined(__clang__)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wplacement-new"
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#endif
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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 Char16String;
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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 = nullptr;
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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 nullptr;
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}
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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 nullptr;
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}
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return reinterpret_cast<uint32_t *>(_ptr) - 1;
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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 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(__GNUC__)
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size_t o;
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size_t p;
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if (__builtin_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 (__builtin_add_overflow(o, static_cast<size_t>(32), &p)) {
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return false; // No longer allocated here.
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}
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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 for 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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uint32_t _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 _ptr;
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}
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_FORCE_INLINE_ const T *ptr() const {
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return _ptr;
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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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}
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_FORCE_INLINE_ void clear() { resize(0); }
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_FORCE_INLINE_ bool is_empty() const { return _ptr == nullptr; }
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_FORCE_INLINE_ void set(int p_index, const T &p_elem) {
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ERR_FAIL_INDEX(p_index, size());
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_copy_on_write();
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_ptr[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 _ptr[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 _ptr[p_index];
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}
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template <bool p_ensure_zero = false>
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Error resize(int p_size);
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_FORCE_INLINE_ void remove_at(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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}
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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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int rfind(const T &p_val, int p_from = -1) const;
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int count(const T &p_val) 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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}
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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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}
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// clean up
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if (!std::is_trivially_destructible<T>::value) {
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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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uint32_t CowData<T>::_copy_on_write() {
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if (!_ptr) {
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return 0;
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}
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SafeNumeric<uint32_t> *refc = _get_refcount();
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uint32_t rc = refc->get();
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if (unlikely(rc > 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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new (mem_new - 2) SafeNumeric<uint32_t>(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 (std::is_trivially_copyable<T>::value) {
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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(_ptr[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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rc = 1;
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}
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return rc;
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}
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template <class T>
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template <bool p_ensure_zero>
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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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}
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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 = nullptr;
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return OK;
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}
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// possibly changing size, copy on write
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uint32_t rc = _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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new (ptr - 2) SafeNumeric<uint32_t>(1); //refcount
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_ptr = (T *)ptr;
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} else {
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uint32_t *_ptrnew = (uint32_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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new (_ptrnew - 2) SafeNumeric<uint32_t>(rc); //refcount
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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 (!std::is_trivially_constructible<T>::value) {
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for (int i = *_get_size(); i < p_size; i++) {
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memnew_placement(&_ptr[i], T);
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}
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} else if (p_ensure_zero) {
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memset((void *)(_ptr + current_size), 0, (p_size - current_size) * sizeof(T));
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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 (!std::is_trivially_destructible<T>::value) {
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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 = &_ptr[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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uint32_t *_ptrnew = (uint32_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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new (_ptrnew - 2) SafeNumeric<uint32_t>(rc); //refcount
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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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int CowData<T>::rfind(const T &p_val, int p_from) const {
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const int s = size();
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if (p_from < 0) {
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p_from = s + p_from;
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}
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if (p_from < 0 || p_from >= s) {
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p_from = s - 1;
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}
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for (int i = p_from; i >= 0; i--) {
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if (get(i) == p_val) {
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return i;
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}
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}
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return -1;
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}
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template <class T>
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int CowData<T>::count(const T &p_val) const {
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int amount = 0;
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for (int i = 0; i < size(); i++) {
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if (get(i) == p_val) {
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amount++;
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}
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}
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return amount;
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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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}
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_unref(_ptr);
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_ptr = nullptr;
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if (!p_from._ptr) {
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return; //nothing to do
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}
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if (p_from._get_refcount()->conditional_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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_unref(_ptr);
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}
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#if defined(__GNUC__) && !defined(__clang__)
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#pragma GCC diagnostic pop
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#endif
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#endif // COWDATA_H
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