mirror of
https://github.com/Relintai/pandemonium_engine.git
synced 2024-12-22 20:06:49 +01:00
393 lines
9.4 KiB
C++
393 lines
9.4 KiB
C++
#ifndef COWDATA_H_
|
|
#define COWDATA_H_
|
|
/*************************************************************************/
|
|
/* cowdata.h */
|
|
/*************************************************************************/
|
|
/* This file is part of: */
|
|
/* GODOT ENGINE */
|
|
/* https://godotengine.org */
|
|
/*************************************************************************/
|
|
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
|
|
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
|
|
/* */
|
|
/* 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 <string.h>
|
|
|
|
#include "core/error/error_macros.h"
|
|
#include "core/os/memory.h"
|
|
#include "core/safe_refcount.h"
|
|
|
|
template <class T>
|
|
class Vector;
|
|
class String;
|
|
class Char16String;
|
|
class CharString;
|
|
template <class T, class V>
|
|
class VMap;
|
|
|
|
#if !defined(NO_THREADS)
|
|
SAFE_NUMERIC_TYPE_PUN_GUARANTEES(uint32_t)
|
|
#endif
|
|
|
|
template <class T>
|
|
class CowData {
|
|
template <class TV>
|
|
friend class Vector;
|
|
friend class String;
|
|
friend class Char16String;
|
|
friend class CharString;
|
|
template <class TV, class VV>
|
|
friend class VMap;
|
|
|
|
private:
|
|
mutable T *_ptr;
|
|
|
|
// internal helpers
|
|
|
|
_FORCE_INLINE_ SafeNumeric<uint32_t> *_get_refcount() const {
|
|
if (!_ptr) {
|
|
return nullptr;
|
|
}
|
|
|
|
return reinterpret_cast<SafeNumeric<uint32_t> *>(_ptr) - 2;
|
|
}
|
|
|
|
_FORCE_INLINE_ uint32_t *_get_size() const {
|
|
if (!_ptr) {
|
|
return nullptr;
|
|
}
|
|
|
|
return reinterpret_cast<uint32_t *>(_ptr) - 1;
|
|
}
|
|
|
|
_FORCE_INLINE_ size_t _get_alloc_size(size_t p_elements) const {
|
|
//return nearest_power_of_2_templated(p_elements*sizeof(T)+sizeof(SafeRefCount)+sizeof(int));
|
|
return next_power_of_2(p_elements * sizeof(T));
|
|
}
|
|
|
|
_FORCE_INLINE_ bool _get_alloc_size_checked(size_t p_elements, size_t *out) const {
|
|
#if defined(_add_overflow) && defined(_mul_overflow)
|
|
size_t o;
|
|
size_t p;
|
|
if (_mul_overflow(p_elements, sizeof(T), &o)) {
|
|
*out = 0;
|
|
return false;
|
|
}
|
|
*out = next_power_of_2(o);
|
|
if (_add_overflow(o, static_cast<size_t>(32), &p)) {
|
|
return false; //no longer allocated here
|
|
}
|
|
return true;
|
|
#else
|
|
// Speed is more important than correctness here, do the operations unchecked
|
|
// and hope the best
|
|
*out = _get_alloc_size(p_elements);
|
|
return true;
|
|
#endif
|
|
}
|
|
|
|
void _unref(void *p_data);
|
|
void _ref(const CowData *p_from);
|
|
void _ref(const CowData &p_from);
|
|
uint32_t _copy_on_write();
|
|
|
|
public:
|
|
void operator=(const CowData<T> &p_from) { _ref(p_from); }
|
|
|
|
_FORCE_INLINE_ T *ptrw() {
|
|
_copy_on_write();
|
|
return _ptr;
|
|
}
|
|
|
|
_FORCE_INLINE_ const T *ptr() const {
|
|
return _ptr;
|
|
}
|
|
|
|
_FORCE_INLINE_ int size() const {
|
|
uint32_t *size = (uint32_t *)_get_size();
|
|
if (size) {
|
|
return *size;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
_FORCE_INLINE_ void clear() { resize(0); }
|
|
_FORCE_INLINE_ bool empty() const { return _ptr == nullptr; }
|
|
|
|
_FORCE_INLINE_ void set(int p_index, const T &p_elem) {
|
|
CRASH_BAD_INDEX(p_index, size());
|
|
_copy_on_write();
|
|
_ptr[p_index] = p_elem;
|
|
}
|
|
|
|
_FORCE_INLINE_ T &get_m(int p_index) {
|
|
CRASH_BAD_INDEX(p_index, size());
|
|
_copy_on_write();
|
|
return _ptr[p_index];
|
|
}
|
|
|
|
_FORCE_INLINE_ const T &get(int p_index) const {
|
|
CRASH_BAD_INDEX(p_index, size());
|
|
|
|
return _ptr[p_index];
|
|
}
|
|
|
|
Error resize(int p_size);
|
|
|
|
_FORCE_INLINE_ void remove(int p_index) {
|
|
ERR_FAIL_INDEX(p_index, size());
|
|
T *p = ptrw();
|
|
int len = size();
|
|
for (int i = p_index; i < len - 1; i++) {
|
|
p[i] = p[i + 1];
|
|
};
|
|
|
|
resize(len - 1);
|
|
}
|
|
|
|
Error insert(int p_pos, const T &p_val) {
|
|
ERR_FAIL_INDEX_V(p_pos, size() + 1, ERR_INVALID_PARAMETER);
|
|
resize(size() + 1);
|
|
for (int i = (size() - 1); i > p_pos; i--) {
|
|
set(i, get(i - 1));
|
|
}
|
|
set(p_pos, p_val);
|
|
|
|
return OK;
|
|
}
|
|
|
|
void fill(const T &p_val) {
|
|
int len = size();
|
|
|
|
if (len == 0) {
|
|
return;
|
|
}
|
|
|
|
T *p = ptrw();
|
|
for (int i = 0; i < len; ++i) {
|
|
p[i] = p_val;
|
|
}
|
|
}
|
|
|
|
int find(const T &p_val, int p_from = 0) const;
|
|
|
|
_FORCE_INLINE_ CowData();
|
|
_FORCE_INLINE_ ~CowData();
|
|
_FORCE_INLINE_ CowData(CowData<T> &p_from) { _ref(p_from); };
|
|
};
|
|
|
|
template <class T>
|
|
void CowData<T>::_unref(void *p_data) {
|
|
if (!p_data) {
|
|
return;
|
|
}
|
|
|
|
SafeNumeric<uint32_t> *refc = _get_refcount();
|
|
|
|
if (refc->decrement() > 0) {
|
|
return; // still in use
|
|
}
|
|
// clean up
|
|
|
|
if (!__has_trivial_destructor(T)) {
|
|
uint32_t *count = _get_size();
|
|
T *data = (T *)(count + 1);
|
|
|
|
for (uint32_t i = 0; i < *count; ++i) {
|
|
// call destructors
|
|
data[i].~T();
|
|
}
|
|
}
|
|
|
|
// free mem
|
|
Memory::free_static((uint8_t *)p_data, true);
|
|
}
|
|
|
|
template <class T>
|
|
uint32_t CowData<T>::_copy_on_write() {
|
|
if (!_ptr) {
|
|
return 0;
|
|
}
|
|
|
|
SafeNumeric<uint32_t> *refc = _get_refcount();
|
|
|
|
uint32_t rc = refc->get();
|
|
if (likely(rc > 1)) {
|
|
/* in use by more than me */
|
|
uint32_t current_size = *_get_size();
|
|
|
|
uint32_t *mem_new = (uint32_t *)Memory::alloc_static(_get_alloc_size(current_size), true);
|
|
|
|
new (mem_new - 2, sizeof(uint32_t), "") SafeNumeric<uint32_t>(1); //refcount
|
|
*(mem_new - 1) = current_size; //size
|
|
|
|
T *_data = (T *)(mem_new);
|
|
|
|
// initialize new elements
|
|
if (__has_trivial_copy(T)) {
|
|
memcpy(mem_new, _ptr, current_size * sizeof(T));
|
|
|
|
} else {
|
|
for (uint32_t i = 0; i < current_size; i++) {
|
|
memnew_placement(&_data[i], T(_ptr[i]));
|
|
}
|
|
}
|
|
|
|
_unref(_ptr);
|
|
_ptr = _data;
|
|
|
|
rc = 1;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
template <class T>
|
|
Error CowData<T>::resize(int p_size) {
|
|
ERR_FAIL_COND_V(p_size < 0, ERR_INVALID_PARAMETER);
|
|
|
|
int current_size = size();
|
|
|
|
if (p_size == current_size) {
|
|
return OK;
|
|
}
|
|
|
|
if (p_size == 0) {
|
|
// wants to clean up
|
|
_unref(_ptr);
|
|
_ptr = nullptr;
|
|
return OK;
|
|
}
|
|
|
|
// possibly changing size, copy on write
|
|
uint32_t rc = _copy_on_write();
|
|
|
|
size_t current_alloc_size = _get_alloc_size(current_size);
|
|
size_t alloc_size;
|
|
ERR_FAIL_COND_V(!_get_alloc_size_checked(p_size, &alloc_size), ERR_OUT_OF_MEMORY);
|
|
|
|
if (p_size > current_size) {
|
|
if (alloc_size != current_alloc_size) {
|
|
if (current_size == 0) {
|
|
// alloc from scratch
|
|
uint32_t *ptr = (uint32_t *)Memory::alloc_static(alloc_size, true);
|
|
ERR_FAIL_COND_V(!ptr, ERR_OUT_OF_MEMORY);
|
|
*(ptr - 1) = 0; //size, currently none
|
|
new (ptr - 2, sizeof(uint32_t), "") SafeNumeric<uint32_t>(1); //refcount
|
|
|
|
_ptr = (T *)ptr;
|
|
|
|
} else {
|
|
uint32_t *_ptrnew = (uint32_t *)Memory::realloc_static(_ptr, alloc_size, true);
|
|
ERR_FAIL_COND_V(!_ptrnew, ERR_OUT_OF_MEMORY);
|
|
new (_ptrnew - 2, sizeof(uint32_t), "") SafeNumeric<uint32_t>(rc); //refcount
|
|
|
|
_ptr = (T *)(_ptrnew);
|
|
}
|
|
}
|
|
|
|
// construct the newly created elements
|
|
|
|
if (!__has_trivial_constructor(T)) {
|
|
for (int i = *_get_size(); i < p_size; i++) {
|
|
memnew_placement(&_ptr[i], T);
|
|
}
|
|
}
|
|
|
|
*_get_size() = p_size;
|
|
|
|
} else if (p_size < current_size) {
|
|
if (!__has_trivial_destructor(T)) {
|
|
// deinitialize no longer needed elements
|
|
for (uint32_t i = p_size; i < *_get_size(); i++) {
|
|
T *t = &_ptr[i];
|
|
t->~T();
|
|
}
|
|
}
|
|
|
|
if (alloc_size != current_alloc_size) {
|
|
uint32_t *_ptrnew = (uint32_t *)Memory::realloc_static(_ptr, alloc_size, true);
|
|
ERR_FAIL_COND_V(!_ptrnew, ERR_OUT_OF_MEMORY);
|
|
new (_ptrnew - 2, sizeof(uint32_t), "") SafeNumeric<uint32_t>(rc); //refcount
|
|
|
|
_ptr = (T *)(_ptrnew);
|
|
}
|
|
|
|
*_get_size() = p_size;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
template <class T>
|
|
int CowData<T>::find(const T &p_val, int p_from) const {
|
|
int ret = -1;
|
|
|
|
if (p_from < 0 || size() == 0) {
|
|
return ret;
|
|
}
|
|
|
|
for (int i = p_from; i < size(); i++) {
|
|
if (get(i) == p_val) {
|
|
ret = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
template <class T>
|
|
void CowData<T>::_ref(const CowData *p_from) {
|
|
_ref(*p_from);
|
|
}
|
|
|
|
template <class T>
|
|
void CowData<T>::_ref(const CowData &p_from) {
|
|
if (_ptr == p_from._ptr) {
|
|
return; // self assign, do nothing.
|
|
}
|
|
|
|
_unref(_ptr);
|
|
_ptr = nullptr;
|
|
|
|
if (!p_from._ptr) {
|
|
return; //nothing to do
|
|
}
|
|
|
|
if (p_from._get_refcount()->conditional_increment() > 0) { // could reference
|
|
_ptr = p_from._ptr;
|
|
}
|
|
}
|
|
|
|
template <class T>
|
|
CowData<T>::CowData() {
|
|
_ptr = nullptr;
|
|
}
|
|
|
|
template <class T>
|
|
CowData<T>::~CowData() {
|
|
_unref(_ptr);
|
|
}
|
|
|
|
#endif /* COW_H_ */
|