initial commit, 4.5 stable

core/object/callable_method_pointer.cpp

@@ -0,0 +1,83 @@
+/**************************************************************************/
+/*  callable_method_pointer.cpp                                           */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* 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 "callable_method_pointer.h"
+
+bool CallableCustomMethodPointerBase::compare_equal(const CallableCustom *p_a, const CallableCustom *p_b) {
+	const CallableCustomMethodPointerBase *a = static_cast<const CallableCustomMethodPointerBase *>(p_a);
+	const CallableCustomMethodPointerBase *b = static_cast<const CallableCustomMethodPointerBase *>(p_b);
+
+	if (a->comp_size != b->comp_size) {
+		return false;
+	}
+
+	// Avoid sorting by memory address proximity, which leads to unpredictable performance over time
+	// due to the reuse of old addresses for newer objects. Use byte-wise comparison to leverage the
+	// backwards encoding of little-endian systems as a way to decouple spatiality and time.
+	return memcmp(a->comp_ptr, b->comp_ptr, a->comp_size * 4) == 0;
+}
+
+bool CallableCustomMethodPointerBase::compare_less(const CallableCustom *p_a, const CallableCustom *p_b) {
+	const CallableCustomMethodPointerBase *a = static_cast<const CallableCustomMethodPointerBase *>(p_a);
+	const CallableCustomMethodPointerBase *b = static_cast<const CallableCustomMethodPointerBase *>(p_b);
+
+	if (a->comp_size != b->comp_size) {
+		return a->comp_size < b->comp_size;
+	}
+
+	// See note in compare_equal().
+	return memcmp(a->comp_ptr, b->comp_ptr, a->comp_size * 4) < 0;
+}
+
+CallableCustom::CompareEqualFunc CallableCustomMethodPointerBase::get_compare_equal_func() const {
+	return compare_equal;
+}
+
+CallableCustom::CompareLessFunc CallableCustomMethodPointerBase::get_compare_less_func() const {
+	return compare_less;
+}
+
+uint32_t CallableCustomMethodPointerBase::hash() const {
+	return h;
+}
+
+void CallableCustomMethodPointerBase::_setup(uint32_t *p_base_ptr, uint32_t p_ptr_size) {
+	comp_ptr = p_base_ptr;
+	comp_size = p_ptr_size / 4;
+
+	// Precompute hash.
+	for (uint32_t i = 0; i < comp_size; i++) {
+		if (i == 0) {
+			h = hash_murmur3_one_32(comp_ptr[i]);
+		} else {
+			h = hash_murmur3_one_32(comp_ptr[i], h);
+		}
+	}
+}