mirror of
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667 lines
17 KiB
C++
667 lines
17 KiB
C++
#ifndef HASH_MAP_H
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#define HASH_MAP_H
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/*************************************************************************/
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/* hash_map.h */
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/*************************************************************************/
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/* This file is part of: */
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/* PANDEMONIUM ENGINE */
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/* https://github.com/Relintai/pandemonium_engine */
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/*************************************************************************/
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/* Copyright (c) 2022-present Péter Magyar. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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/* Copyright (c) 2007-2022 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 "hashfuncs.h"
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#include "paged_allocator.h"
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#include "pair.h"
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#include "core/math/math_funcs.h"
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#include "memory.h"
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/**
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* A HashMap implementation that uses open addressing with Robin Hood hashing.
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* Robin Hood hashing swaps out entries that have a smaller probing distance
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* than the to-be-inserted entry, that evens out the average probing distance
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* and enables faster lookups. Backward shift deletion is employed to further
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* improve the performance and to avoid infinite loops in rare cases.
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*
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* Keys and values are stored in a double linked list by insertion order. This
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* has a slight performance overhead on lookup, which can be mostly compensated
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* using a paged allocator if required.
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*
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* The assignment operator copy the pairs from one map to the other.
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*/
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template <class TKey, class TValue, class Hasher = HashMapHasherDefault, class Comparator = HashMapComparatorDefault<TKey>>
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class HashMap {
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public:
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const uint32_t MIN_CAPACITY_INDEX = 2; // Use a prime.
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const float MAX_OCCUPANCY = 0.75;
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const uint32_t EMPTY_HASH = 0;
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public:
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struct Element {
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Element *next = nullptr;
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Element *prev = nullptr;
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KeyValue<TKey, TValue> data;
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const TKey &key() const {
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return data.key;
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}
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TValue &value() {
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return data.value;
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}
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const TValue &value() const {
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return data.value;
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}
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TValue &get() {
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return data.value;
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};
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const TValue &get() const {
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return data.value;
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};
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Element() {}
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Element(const TKey &p_key, const TValue &p_value) :
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data(p_key, p_value) {}
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};
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public:
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_FORCE_INLINE_ uint32_t get_capacity() const { return hash_table_size_primes[capacity_index]; }
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_FORCE_INLINE_ uint32_t size() const { return num_elements; }
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/* Standard Godot Container API */
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bool empty() const {
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return num_elements == 0;
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}
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void clear() {
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if (elements == nullptr || num_elements == 0) {
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return;
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}
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uint32_t capacity = hash_table_size_primes[capacity_index];
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for (uint32_t i = 0; i < capacity; i++) {
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if (hashes[i] == EMPTY_HASH) {
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continue;
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}
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hashes[i] = EMPTY_HASH;
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memdelete(elements[i]);
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elements[i] = nullptr;
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}
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tail_element = nullptr;
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head_element = nullptr;
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num_elements = 0;
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}
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TValue &get(const TKey &p_key) {
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uint32_t pos = 0;
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bool exists = _lookup_pos(p_key, pos);
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CRASH_COND_MSG(!exists, "HashMap key not found.");
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return elements[pos]->data.value;
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}
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const TValue &get(const TKey &p_key) const {
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uint32_t pos = 0;
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bool exists = _lookup_pos(p_key, pos);
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CRASH_COND_MSG(!exists, "HashMap key not found.");
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return elements[pos]->data.value;
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}
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const TValue *getptr(const TKey &p_key) const {
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uint32_t pos = 0;
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bool exists = _lookup_pos(p_key, pos);
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if (exists) {
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return &elements[pos]->data.value;
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}
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return nullptr;
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}
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TValue *getptr(const TKey &p_key) {
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uint32_t pos = 0;
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bool exists = _lookup_pos(p_key, pos);
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if (exists) {
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return &elements[pos]->data.value;
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}
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return nullptr;
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}
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const Element *get_element(const TKey &p_key) const {
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uint32_t pos = 0;
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bool exists = _lookup_pos(p_key, pos);
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if (exists) {
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return elements[pos];
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}
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return NULL;
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}
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Element *get_element(const TKey &p_key) {
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uint32_t pos = 0;
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bool exists = _lookup_pos(p_key, pos);
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if (exists) {
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return elements[pos];
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}
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return NULL;
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}
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_FORCE_INLINE_ const Element *find(const TKey &p_key) const {
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return get_element(p_key);
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}
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_FORCE_INLINE_ Element *find(const TKey &p_key) {
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return get_element(p_key);
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}
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/**
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* Same as get, except it can return NULL when item was not found.
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* This version is custom, will take a hash and a custom key (that should support operator==()
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*/
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template <class C>
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_FORCE_INLINE_ TValue *custom_getptr(C p_custom_key, uint32_t p_custom_hash) {
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if (unlikely(!elements)) {
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return NULL;
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}
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const uint32_t capacity = hash_table_size_primes[capacity_index];
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const uint64_t capacity_inv = hash_table_size_primes_inv[capacity_index];
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uint32_t hash = p_custom_hash;
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uint32_t pos = fastmod(hash, capacity_inv, capacity);
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uint32_t distance = 0;
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while (true) {
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if (hashes[pos] == EMPTY_HASH) {
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return NULL;
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}
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if (distance > _get_probe_length(pos, hashes[pos], capacity, capacity_inv)) {
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return NULL;
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}
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if (hashes[pos] == hash && Comparator::compare(elements[pos]->data.key, p_custom_key)) {
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return &elements[pos]->data.value;
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}
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pos = fastmod((pos + 1), capacity_inv, capacity);
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distance++;
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}
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return NULL;
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}
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template <class C>
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_FORCE_INLINE_ const TValue *custom_getptr(C p_custom_key, uint32_t p_custom_hash) const {
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if (unlikely(!elements)) {
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return NULL;
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}
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const uint32_t capacity = hash_table_size_primes[capacity_index];
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const uint64_t capacity_inv = hash_table_size_primes_inv[capacity_index];
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uint32_t hash = p_custom_hash;
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uint32_t pos = fastmod(hash, capacity_inv, capacity);
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uint32_t distance = 0;
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while (true) {
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if (hashes[pos] == EMPTY_HASH) {
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return NULL;
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}
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if (distance > _get_probe_length(pos, hashes[pos], capacity, capacity_inv)) {
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return NULL;
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}
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if (hashes[pos] == hash && Comparator::compare(elements[pos]->data.key, p_custom_key)) {
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return &elements[pos]->data.value;
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}
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pos = fastmod((pos + 1), capacity_inv, capacity);
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distance++;
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}
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return NULL;
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}
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_FORCE_INLINE_ bool has(const TKey &p_key) const {
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uint32_t _pos = 0;
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return _lookup_pos(p_key, _pos);
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}
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bool erase(const TKey &p_key) {
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uint32_t pos = 0;
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bool exists = _lookup_pos(p_key, pos);
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if (!exists) {
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return false;
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}
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const uint32_t capacity = hash_table_size_primes[capacity_index];
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const uint64_t capacity_inv = hash_table_size_primes_inv[capacity_index];
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uint32_t next_pos = fastmod((pos + 1), capacity_inv, capacity);
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while (hashes[next_pos] != EMPTY_HASH && _get_probe_length(next_pos, hashes[next_pos], capacity, capacity_inv) != 0) {
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SWAP(hashes[next_pos], hashes[pos]);
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SWAP(elements[next_pos], elements[pos]);
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pos = next_pos;
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next_pos = fastmod((pos + 1), capacity_inv, capacity);
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}
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hashes[pos] = EMPTY_HASH;
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if (head_element == elements[pos]) {
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head_element = elements[pos]->next;
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}
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if (tail_element == elements[pos]) {
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tail_element = elements[pos]->prev;
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}
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if (elements[pos]->prev) {
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elements[pos]->prev->next = elements[pos]->next;
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}
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if (elements[pos]->next) {
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elements[pos]->next->prev = elements[pos]->prev;
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}
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memdelete(elements[pos]);
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elements[pos] = nullptr;
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num_elements--;
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return true;
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}
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// Reserves space for a number of elements, useful to avoid many resizes and rehashes.
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// If adding a known (possibly large) number of elements at once, must be larger than old capacity.
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void reserve(uint32_t p_new_capacity) {
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uint32_t new_index = capacity_index;
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while (hash_table_size_primes[new_index] < p_new_capacity) {
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ERR_FAIL_COND_MSG(new_index + 1 == (uint32_t)HASH_TABLE_SIZE_MAX, nullptr);
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new_index++;
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}
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if (new_index == capacity_index) {
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return;
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}
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if (elements == nullptr) {
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capacity_index = new_index;
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return; // Unallocated yet.
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}
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_resize_and_rehash(new_index);
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}
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_FORCE_INLINE_ Element *front() {
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return head_element;
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}
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_FORCE_INLINE_ Element *back() {
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return tail_element;
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}
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_FORCE_INLINE_ const Element *front() const {
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return head_element;
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}
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_FORCE_INLINE_ const Element *back() const {
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return tail_element;
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}
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/**
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* Get the next key to p_key, and the first key if p_key is null.
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* Returns a pointer to the next key if found, NULL otherwise.
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* Adding/Removing elements while iterating will, of course, have unexpected results, don't do it.
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*
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* Example:
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*
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* const TKey *k=NULL;
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*
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* while( (k=table.next(k)) ) {
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*
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* print( *k );
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* }
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*
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* This is for backwards compatibility. Use this syntax instead for new code:
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*
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* for (const HashMap<K, V>::Element *E = map.front(); E; E = E->next) {
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* ...
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* }
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*
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*/
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const TKey *next(const TKey *p_key) const {
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if (unlikely(!elements)) {
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return nullptr;
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}
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if (!p_key) { /* get the first key */
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if (unlikely(!front())) {
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return nullptr;
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}
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return &front()->data.key;
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} else { /* get the next key */
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const Element *e = get_element(*p_key);
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ERR_FAIL_COND_V_MSG(!e, nullptr, "Invalid key supplied.");
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if (e->next) {
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/* if there is a "next" in the list, return that */
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return &e->next->data.key;
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}
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/* nothing found, was at end */
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}
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return nullptr; /* nothing found */
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}
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/* Indexing */
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const TValue &operator[](const TKey &p_key) const {
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uint32_t pos = 0;
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bool exists = _lookup_pos(p_key, pos);
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CRASH_COND(!exists);
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return elements[pos]->data.value;
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}
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TValue &operator[](const TKey &p_key) {
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uint32_t pos = 0;
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bool exists = _lookup_pos(p_key, pos);
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if (!exists) {
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return _insert(p_key, TValue())->data.value;
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} else {
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return elements[pos]->data.value;
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}
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}
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/* Insert */
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Element *insert(const TKey &p_key, const TValue &p_value, bool p_front_insert = false) {
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return _insert(p_key, p_value, p_front_insert);
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}
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Element *set(const TKey &p_key, const TValue &p_value, bool p_front_insert = false) {
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return _insert(p_key, p_value, p_front_insert);
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}
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/* Helpers */
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void get_key_list(List<TKey> *p_keys) const {
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if (unlikely(!elements)) {
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return;
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}
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for (const Element *E = front(); E; E = E->next) {
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p_keys->push_back(E->data.key);
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}
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}
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/* Constructors */
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HashMap(const HashMap &p_other) {
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reserve(hash_table_size_primes[p_other.capacity_index]);
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if (p_other.num_elements == 0) {
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return;
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}
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for (const Element *E = p_other.front(); E; E = E->next) {
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insert(E->data.key, E->data.value);
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}
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}
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void operator=(const HashMap &p_other) {
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if (this == &p_other) {
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return; // Ignore self assignment.
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}
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if (num_elements != 0) {
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clear();
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}
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reserve(hash_table_size_primes[p_other.capacity_index]);
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if (p_other.elements == nullptr) {
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return; // Nothing to copy.
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}
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for (const Element *E = p_other.front(); E; E = E->next) {
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insert(E->data.key, E->data.value);
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}
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}
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HashMap(uint32_t p_initial_capacity) {
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// Capacity can't be 0.
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capacity_index = 0;
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reserve(p_initial_capacity);
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}
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HashMap() {
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capacity_index = MIN_CAPACITY_INDEX;
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}
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uint32_t debug_get_hash(uint32_t p_index) {
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if (num_elements == 0) {
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return 0;
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}
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ERR_FAIL_INDEX_V(p_index, get_capacity(), 0);
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return hashes[p_index];
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}
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Element *debug_get_element(uint32_t p_index) {
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if (num_elements == 0) {
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return NULL;
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}
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ERR_FAIL_INDEX_V(p_index, get_capacity(), NULL);
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return elements[p_index];
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}
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~HashMap() {
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clear();
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if (elements != nullptr) {
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Memory::free_static(elements);
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Memory::free_static(hashes);
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}
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}
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private:
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Element **elements = nullptr;
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uint32_t *hashes = nullptr;
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Element *head_element = nullptr;
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Element *tail_element = nullptr;
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uint32_t capacity_index = 0;
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uint32_t num_elements = 0;
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_FORCE_INLINE_ uint32_t _hash(const TKey &p_key) const {
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uint32_t hash = Hasher::hash(p_key);
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if (unlikely(hash == EMPTY_HASH)) {
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hash = EMPTY_HASH + 1;
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}
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return hash;
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}
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static _FORCE_INLINE_ uint32_t _get_probe_length(const uint32_t p_pos, const uint32_t p_hash, const uint32_t p_capacity, const uint64_t p_capacity_inv) {
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const uint32_t original_pos = fastmod(p_hash, p_capacity_inv, p_capacity);
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return fastmod(p_pos - original_pos + p_capacity, p_capacity_inv, p_capacity);
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}
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bool _lookup_pos(const TKey &p_key, uint32_t &r_pos) const {
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if (elements == nullptr || num_elements == 0) {
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return false; // Failed lookups, no elements
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}
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const uint32_t capacity = hash_table_size_primes[capacity_index];
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const uint64_t capacity_inv = hash_table_size_primes_inv[capacity_index];
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uint32_t hash = _hash(p_key);
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uint32_t pos = fastmod(hash, capacity_inv, capacity);
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uint32_t distance = 0;
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while (true) {
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if (hashes[pos] == EMPTY_HASH) {
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return false;
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}
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if (distance > _get_probe_length(pos, hashes[pos], capacity, capacity_inv)) {
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return false;
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}
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if (hashes[pos] == hash && Comparator::compare(elements[pos]->data.key, p_key)) {
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r_pos = pos;
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return true;
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|
}
|
|
|
|
pos = fastmod((pos + 1), capacity_inv, capacity);
|
|
distance++;
|
|
}
|
|
}
|
|
|
|
void _insert_with_hash(uint32_t p_hash, Element *p_value) {
|
|
const uint32_t capacity = hash_table_size_primes[capacity_index];
|
|
const uint64_t capacity_inv = hash_table_size_primes_inv[capacity_index];
|
|
uint32_t hash = p_hash;
|
|
Element *value = p_value;
|
|
uint32_t distance = 0;
|
|
uint32_t pos = fastmod(hash, capacity_inv, capacity);
|
|
|
|
while (true) {
|
|
if (hashes[pos] == EMPTY_HASH) {
|
|
elements[pos] = value;
|
|
hashes[pos] = hash;
|
|
|
|
num_elements++;
|
|
|
|
return;
|
|
}
|
|
|
|
// Not an empty slot, let's check the probing length of the existing one.
|
|
uint32_t existing_probe_len = _get_probe_length(pos, hashes[pos], capacity, capacity_inv);
|
|
if (existing_probe_len < distance) {
|
|
SWAP(hash, hashes[pos]);
|
|
SWAP(value, elements[pos]);
|
|
distance = existing_probe_len;
|
|
}
|
|
|
|
pos = fastmod((pos + 1), capacity_inv, capacity);
|
|
distance++;
|
|
}
|
|
}
|
|
|
|
void _resize_and_rehash(uint32_t p_new_capacity_index) {
|
|
uint32_t old_capacity = hash_table_size_primes[capacity_index];
|
|
|
|
// Capacity can't be 0.
|
|
capacity_index = MAX((uint32_t)MIN_CAPACITY_INDEX, p_new_capacity_index);
|
|
|
|
uint32_t capacity = hash_table_size_primes[capacity_index];
|
|
|
|
Element **old_elements = elements;
|
|
uint32_t *old_hashes = hashes;
|
|
|
|
num_elements = 0;
|
|
hashes = reinterpret_cast<uint32_t *>(Memory::alloc_static(sizeof(uint32_t) * capacity));
|
|
elements = reinterpret_cast<Element **>(Memory::alloc_static(sizeof(Element *) * capacity));
|
|
|
|
for (uint32_t i = 0; i < capacity; i++) {
|
|
hashes[i] = 0;
|
|
elements[i] = nullptr;
|
|
}
|
|
|
|
if (old_capacity == 0) {
|
|
// Nothing to do.
|
|
return;
|
|
}
|
|
|
|
for (uint32_t i = 0; i < old_capacity; i++) {
|
|
if (old_hashes[i] == EMPTY_HASH) {
|
|
continue;
|
|
}
|
|
|
|
_insert_with_hash(old_hashes[i], old_elements[i]);
|
|
}
|
|
|
|
Memory::free_static(old_elements);
|
|
Memory::free_static(old_hashes);
|
|
}
|
|
|
|
_FORCE_INLINE_ Element *_insert(const TKey &p_key, const TValue &p_value, bool p_front_insert = false) {
|
|
uint32_t capacity = hash_table_size_primes[capacity_index];
|
|
if (unlikely(elements == nullptr)) {
|
|
// Allocate on demand to save memory.
|
|
|
|
hashes = reinterpret_cast<uint32_t *>(Memory::alloc_static(sizeof(uint32_t) * capacity));
|
|
elements = reinterpret_cast<Element **>(Memory::alloc_static(sizeof(Element *) * capacity));
|
|
|
|
for (uint32_t i = 0; i < capacity; i++) {
|
|
hashes[i] = EMPTY_HASH;
|
|
elements[i] = nullptr;
|
|
}
|
|
}
|
|
|
|
uint32_t pos = 0;
|
|
bool exists = _lookup_pos(p_key, pos);
|
|
|
|
if (exists) {
|
|
elements[pos]->data.value = p_value;
|
|
return elements[pos];
|
|
} else {
|
|
if (num_elements + 1 > MAX_OCCUPANCY * capacity) {
|
|
ERR_FAIL_COND_V_MSG(capacity_index + 1 == HASH_TABLE_SIZE_MAX, nullptr, "Hash table maximum capacity reached, aborting insertion.");
|
|
_resize_and_rehash(capacity_index + 1);
|
|
}
|
|
|
|
Element *elem = memnew(Element(p_key, p_value));
|
|
|
|
if (tail_element == nullptr) {
|
|
head_element = elem;
|
|
tail_element = elem;
|
|
} else if (p_front_insert) {
|
|
head_element->prev = elem;
|
|
elem->next = head_element;
|
|
head_element = elem;
|
|
} else {
|
|
tail_element->next = elem;
|
|
elem->prev = tail_element;
|
|
tail_element = elem;
|
|
}
|
|
|
|
uint32_t hash = _hash(p_key);
|
|
_insert_with_hash(hash, elem);
|
|
return elem;
|
|
}
|
|
}
|
|
};
|
|
|
|
#endif // HASH_MAP_H
|