f8ab79e68a
This prevents the pitfall of UB when checking if they have been assigned something valid by comparing to nullptr.
198 lines
6.8 KiB
C++
198 lines
6.8 KiB
C++
/*************************************************************************/
|
|
/* string_name.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. */
|
|
/*************************************************************************/
|
|
|
|
#ifndef STRING_NAME_H
|
|
#define STRING_NAME_H
|
|
|
|
#include "core/os/mutex.h"
|
|
#include "core/string/ustring.h"
|
|
#include "core/templates/safe_refcount.h"
|
|
|
|
class Main;
|
|
|
|
struct StaticCString {
|
|
const char *ptr;
|
|
static StaticCString create(const char *p_ptr);
|
|
};
|
|
|
|
class StringName {
|
|
enum {
|
|
STRING_TABLE_BITS = 16,
|
|
STRING_TABLE_LEN = 1 << STRING_TABLE_BITS,
|
|
STRING_TABLE_MASK = STRING_TABLE_LEN - 1
|
|
};
|
|
|
|
struct _Data {
|
|
SafeRefCount refcount;
|
|
SafeNumeric<uint32_t> static_count;
|
|
const char *cname = nullptr;
|
|
String name;
|
|
#ifdef DEBUG_ENABLED
|
|
uint32_t debug_references = 0;
|
|
#endif
|
|
String get_name() const { return cname ? String(cname) : name; }
|
|
int idx = 0;
|
|
uint32_t hash = 0;
|
|
_Data *prev = nullptr;
|
|
_Data *next = nullptr;
|
|
_Data() {}
|
|
};
|
|
|
|
static _Data *_table[STRING_TABLE_LEN];
|
|
|
|
_Data *_data = nullptr;
|
|
|
|
union _HashUnion {
|
|
_Data *ptr = nullptr;
|
|
uint32_t hash;
|
|
};
|
|
|
|
void unref();
|
|
friend void register_core_types();
|
|
friend void unregister_core_types();
|
|
friend class Main;
|
|
static Mutex mutex;
|
|
static void setup();
|
|
static void cleanup();
|
|
static bool configured;
|
|
#ifdef DEBUG_ENABLED
|
|
struct DebugSortReferences {
|
|
bool operator()(const _Data *p_left, const _Data *p_right) const {
|
|
return p_left->debug_references > p_right->debug_references;
|
|
}
|
|
};
|
|
|
|
static bool debug_stringname;
|
|
#endif
|
|
|
|
StringName(_Data *p_data) { _data = p_data; }
|
|
|
|
public:
|
|
operator const void *() const { return (_data && (_data->cname || !_data->name.is_empty())) ? (void *)1 : nullptr; }
|
|
|
|
bool operator==(const String &p_name) const;
|
|
bool operator==(const char *p_name) const;
|
|
bool operator!=(const String &p_name) const;
|
|
_FORCE_INLINE_ bool operator<(const StringName &p_name) const {
|
|
return _data < p_name._data;
|
|
}
|
|
_FORCE_INLINE_ bool operator==(const StringName &p_name) const {
|
|
// the real magic of all this mess happens here.
|
|
// this is why path comparisons are very fast
|
|
return _data == p_name._data;
|
|
}
|
|
_FORCE_INLINE_ uint32_t hash() const {
|
|
if (_data) {
|
|
return _data->hash;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
_FORCE_INLINE_ const void *data_unique_pointer() const {
|
|
return (void *)_data;
|
|
}
|
|
bool operator!=(const StringName &p_name) const;
|
|
|
|
_FORCE_INLINE_ operator String() const {
|
|
if (_data) {
|
|
if (_data->cname) {
|
|
return String(_data->cname);
|
|
} else {
|
|
return _data->name;
|
|
}
|
|
}
|
|
|
|
return String();
|
|
}
|
|
|
|
static StringName search(const char *p_name);
|
|
static StringName search(const char32_t *p_name);
|
|
static StringName search(const String &p_name);
|
|
|
|
struct AlphCompare {
|
|
_FORCE_INLINE_ bool operator()(const StringName &l, const StringName &r) const {
|
|
const char *l_cname = l._data ? l._data->cname : "";
|
|
const char *r_cname = r._data ? r._data->cname : "";
|
|
|
|
if (l_cname) {
|
|
if (r_cname) {
|
|
return is_str_less(l_cname, r_cname);
|
|
} else {
|
|
return is_str_less(l_cname, r._data->name.ptr());
|
|
}
|
|
} else {
|
|
if (r_cname) {
|
|
return is_str_less(l._data->name.ptr(), r_cname);
|
|
} else {
|
|
return is_str_less(l._data->name.ptr(), r._data->name.ptr());
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
void operator=(const StringName &p_name);
|
|
StringName(const char *p_name, bool p_static = false);
|
|
StringName(const StringName &p_name);
|
|
StringName(const String &p_name, bool p_static = false);
|
|
StringName(const StaticCString &p_static_string, bool p_static = false);
|
|
StringName() {}
|
|
_FORCE_INLINE_ ~StringName() {
|
|
if (likely(configured) && _data) { //only free if configured
|
|
unref();
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG_ENABLED
|
|
static void set_debug_stringnames(bool p_enable) { debug_stringname = p_enable; }
|
|
#endif
|
|
};
|
|
|
|
bool operator==(const String &p_name, const StringName &p_string_name);
|
|
bool operator!=(const String &p_name, const StringName &p_string_name);
|
|
bool operator==(const char *p_name, const StringName &p_string_name);
|
|
bool operator!=(const char *p_name, const StringName &p_string_name);
|
|
|
|
StringName _scs_create(const char *p_chr, bool p_static = false);
|
|
|
|
/*
|
|
* The SNAME macro is used to speed up StringName creation, as it allows caching it after the first usage in a very efficient way.
|
|
* It should NOT be used everywhere, but instead in places where high performance is required and the creation of a StringName
|
|
* can be costly. Places where it should be used are:
|
|
* - Control::get_theme_*(<name> and Window::get_theme_*(<name> functions.
|
|
* - emit_signal(<name>,..) function
|
|
* - call_deferred(<name>,..) function
|
|
* - Comparisons to a StringName in overridden _set and _get methods.
|
|
*
|
|
* Use in places that can be called hundreds of times per frame (or more) is recommended, but this situation is very rare. If in doubt, do not use.
|
|
*/
|
|
|
|
#define SNAME(m_arg) ([]() -> const StringName & { static StringName sname = _scs_create(m_arg, true); return sname; })()
|
|
|
|
#endif // STRING_NAME_H
|