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83 lines
4 KiB
C++
83 lines
4 KiB
C++
/**************************************************************************/
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/* callable_method_pointer.cpp */
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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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#include "callable_method_pointer.h"
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bool CallableCustomMethodPointerBase::compare_equal(const CallableCustom *p_a, const CallableCustom *p_b) {
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const CallableCustomMethodPointerBase *a = static_cast<const CallableCustomMethodPointerBase *>(p_a);
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const CallableCustomMethodPointerBase *b = static_cast<const CallableCustomMethodPointerBase *>(p_b);
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if (a->comp_size != b->comp_size) {
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return false;
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}
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// Avoid sorting by memory address proximity, which leads to unpredictable performance over time
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// due to the reuse of old addresses for newer objects. Use byte-wise comparison to leverage the
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// backwards encoding of little-endian systems as a way to decouple spatiality and time.
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return memcmp(a->comp_ptr, b->comp_ptr, a->comp_size * 4) == 0;
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}
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bool CallableCustomMethodPointerBase::compare_less(const CallableCustom *p_a, const CallableCustom *p_b) {
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const CallableCustomMethodPointerBase *a = static_cast<const CallableCustomMethodPointerBase *>(p_a);
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const CallableCustomMethodPointerBase *b = static_cast<const CallableCustomMethodPointerBase *>(p_b);
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if (a->comp_size != b->comp_size) {
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return a->comp_size < b->comp_size;
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}
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// See note in compare_equal().
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return memcmp(a->comp_ptr, b->comp_ptr, a->comp_size * 4) < 0;
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}
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CallableCustom::CompareEqualFunc CallableCustomMethodPointerBase::get_compare_equal_func() const {
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return compare_equal;
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}
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CallableCustom::CompareLessFunc CallableCustomMethodPointerBase::get_compare_less_func() const {
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return compare_less;
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}
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uint32_t CallableCustomMethodPointerBase::hash() const {
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return h;
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}
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void CallableCustomMethodPointerBase::_setup(uint32_t *p_base_ptr, uint32_t p_ptr_size) {
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comp_ptr = p_base_ptr;
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comp_size = p_ptr_size / 4;
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// Precompute hash.
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for (uint32_t i = 0; i < comp_size; i++) {
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if (i == 0) {
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h = hash_murmur3_one_32(comp_ptr[i]);
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} else {
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h = hash_murmur3_one_32(comp_ptr[i], h);
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}
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}
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}
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