Sun, 21 May 2023 14:37:56 +0200
add empty map implementation - fixes #259
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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |
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29 | #include <string.h> |
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30 | #include "cx/hash_map.h" |
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31 | #include "cx/utils.h" |
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32 | |
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33 | struct cx_hash_map_element_s { |
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34 | /** A pointer to the next element in the current bucket. */ |
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35 | struct cx_hash_map_element_s *next; |
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36 | |
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37 | /** The corresponding key. */ |
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38 | CxHashKey key; |
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39 | |
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40 | /** The value data. */ |
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41 | char data[]; |
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42 | }; |
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43 | |
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44 | static void cx_hash_map_clear(struct cx_map_s *map) { |
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45 | struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map; |
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46 | cx_for_n(i, hash_map->bucket_count) { |
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47 | struct cx_hash_map_element_s *elem = hash_map->buckets[i]; |
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48 | if (elem != NULL) { |
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49 | do { |
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50 | struct cx_hash_map_element_s *next = elem->next; |
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51 | // invoke the destructor |
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52 | cx_invoke_destructor(map, elem->data); |
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53 | // free the key data |
690 | 54 | cxFree(map->allocator, (void *) elem->key.data); |
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55 | // free the node |
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56 | cxFree(map->allocator, elem); |
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57 | // proceed |
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58 | elem = next; |
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59 | } while (elem != NULL); |
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60 | |
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61 | // do not leave a dangling pointer |
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62 | hash_map->buckets[i] = NULL; |
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63 | } |
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64 | } |
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65 | map->size = 0; |
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66 | } |
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67 | |
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68 | static void cx_hash_map_destructor(struct cx_map_s *map) { |
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69 | struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map; |
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70 | |
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71 | // free the buckets |
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72 | cx_hash_map_clear(map); |
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73 | cxFree(map->allocator, hash_map->buckets); |
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74 | |
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75 | // free the map structure |
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76 | cxFree(map->allocator, map); |
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77 | } |
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78 | |
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79 | static int cx_hash_map_put( |
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80 | CxMap *map, |
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81 | CxHashKey key, |
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82 | void *value |
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83 | ) { |
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84 | struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map; |
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85 | CxAllocator const *allocator = map->allocator; |
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86 | |
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87 | unsigned hash = key.hash; |
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88 | if (hash == 0) { |
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89 | cx_hash_murmur(&key); |
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90 | hash = key.hash; |
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91 | } |
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92 | |
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93 | size_t slot = hash % hash_map->bucket_count; |
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94 | struct cx_hash_map_element_s *elm = hash_map->buckets[slot]; |
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95 | struct cx_hash_map_element_s *prev = NULL; |
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96 | |
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97 | while (elm != NULL && elm->key.hash < hash) { |
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98 | prev = elm; |
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99 | elm = elm->next; |
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100 | } |
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101 | |
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102 | if (elm != NULL && elm->key.hash == hash && elm->key.len == key.len && |
690 | 103 | memcmp(elm->key.data, key.data, key.len) == 0) { |
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104 | // overwrite existing element |
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105 | if (map->store_pointer) { |
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106 | memcpy(elm->data, &value, sizeof(void *)); |
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107 | } else { |
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108 | memcpy(elm->data, value, map->item_size); |
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109 | } |
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110 | } else { |
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111 | // allocate new element |
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112 | struct cx_hash_map_element_s *e = cxMalloc( |
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113 | allocator, |
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114 | sizeof(struct cx_hash_map_element_s) + map->item_size |
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115 | ); |
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116 | if (e == NULL) { |
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117 | return -1; |
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118 | } |
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119 | |
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120 | // write the value |
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121 | if (map->store_pointer) { |
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122 | memcpy(e->data, &value, sizeof(void *)); |
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123 | } else { |
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124 | memcpy(e->data, value, map->item_size); |
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125 | } |
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126 | |
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127 | // copy the key |
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128 | void *kd = cxMalloc(allocator, key.len); |
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129 | if (kd == NULL) { |
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130 | return -1; |
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131 | } |
690 | 132 | memcpy(kd, key.data, key.len); |
133 | e->key.data = kd; | |
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134 | e->key.len = key.len; |
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135 | e->key.hash = hash; |
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136 | |
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137 | // insert the element into the linked list |
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138 | if (prev == NULL) { |
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139 | hash_map->buckets[slot] = e; |
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140 | } else { |
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141 | prev->next = e; |
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142 | } |
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143 | e->next = elm; |
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144 | |
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145 | // increase the size |
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146 | map->size++; |
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147 | } |
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148 | |
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149 | return 0; |
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150 | } |
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151 | |
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152 | static void cx_hash_map_unlink( |
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153 | struct cx_hash_map_s *hash_map, |
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154 | size_t slot, |
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155 | struct cx_hash_map_element_s *prev, |
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156 | struct cx_hash_map_element_s *elm |
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157 | ) { |
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158 | // unlink |
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159 | if (prev == NULL) { |
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160 | hash_map->buckets[slot] = elm->next; |
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161 | } else { |
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162 | prev->next = elm->next; |
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163 | } |
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164 | // free element |
690 | 165 | cxFree(hash_map->base.allocator, (void *) elm->key.data); |
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166 | cxFree(hash_map->base.allocator, elm); |
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167 | // decrease size |
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168 | hash_map->base.size--; |
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169 | } |
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170 | |
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171 | /** |
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172 | * Helper function to avoid code duplication. |
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173 | * |
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174 | * @param map the map |
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175 | * @param key the key to look up |
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176 | * @param remove flag indicating whether the looked up entry shall be removed |
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177 | * @param destroy flag indicating whether the destructor shall be invoked |
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178 | * @return a pointer to the value corresponding to the key or \c NULL |
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179 | */ |
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180 | static void *cx_hash_map_get_remove( |
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181 | CxMap *map, |
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182 | CxHashKey key, |
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183 | bool remove, |
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184 | bool destroy |
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185 | ) { |
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186 | struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map; |
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187 | |
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188 | unsigned hash = key.hash; |
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189 | if (hash == 0) { |
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190 | cx_hash_murmur(&key); |
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191 | hash = key.hash; |
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192 | } |
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193 | |
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194 | size_t slot = hash % hash_map->bucket_count; |
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195 | struct cx_hash_map_element_s *elm = hash_map->buckets[slot]; |
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196 | struct cx_hash_map_element_s *prev = NULL; |
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197 | while (elm && elm->key.hash <= hash) { |
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198 | if (elm->key.hash == hash && elm->key.len == key.len) { |
690 | 199 | if (memcmp(elm->key.data, key.data, key.len) == 0) { |
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200 | void *data = NULL; |
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201 | if (destroy) { |
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202 | cx_invoke_destructor(map, elm->data); |
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203 | } else { |
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204 | if (map->store_pointer) { |
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205 | data = *(void **) elm->data; |
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206 | } else { |
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207 | data = elm->data; |
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208 | } |
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209 | } |
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210 | if (remove) { |
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211 | cx_hash_map_unlink(hash_map, slot, prev, elm); |
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212 | } |
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213 | return data; |
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214 | } |
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215 | } |
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216 | prev = elm; |
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217 | elm = prev->next; |
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218 | } |
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219 | |
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220 | return NULL; |
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221 | } |
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222 | |
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223 | static void *cx_hash_map_get( |
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224 | CxMap const *map, |
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225 | CxHashKey key |
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226 | ) { |
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227 | // we can safely cast, because we know the map stays untouched |
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228 | return cx_hash_map_get_remove((CxMap *) map, key, false, false); |
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229 | } |
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230 | |
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231 | static void *cx_hash_map_remove( |
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232 | CxMap *map, |
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233 | CxHashKey key, |
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234 | bool destroy |
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235 | ) { |
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236 | return cx_hash_map_get_remove(map, key, true, destroy); |
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237 | } |
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238 | |
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239 | static void *cx_hash_map_iter_current_entry(void const *it) { |
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240 | struct cx_iterator_s const *iter = it; |
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241 | // struct has to have a compatible signature |
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242 | return (struct cx_map_entry_s *) &(iter->kv_data); |
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243 | } |
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244 | |
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245 | static void *cx_hash_map_iter_current_key(void const *it) { |
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246 | struct cx_iterator_s const *iter = it; |
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247 | struct cx_hash_map_element_s *elm = iter->elem_handle; |
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248 | return &elm->key; |
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249 | } |
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250 | |
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251 | static void *cx_hash_map_iter_current_value(void const *it) { |
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252 | struct cx_iterator_s const *iter = it; |
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253 | struct cx_hash_map_s const *map = iter->src_handle; |
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254 | struct cx_hash_map_element_s *elm = iter->elem_handle; |
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255 | if (map->base.store_pointer) { |
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256 | return *(void **) elm->data; |
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257 | } else { |
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258 | return elm->data; |
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259 | } |
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260 | } |
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261 | |
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262 | static bool cx_hash_map_iter_valid(void const *it) { |
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263 | struct cx_iterator_s const *iter = it; |
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264 | return iter->elem_handle != NULL; |
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265 | } |
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266 | |
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267 | static void cx_hash_map_iter_next(void *it) { |
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268 | struct cx_iterator_s *iter = it; |
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269 | struct cx_hash_map_element_s *elm = iter->elem_handle; |
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270 | |
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271 | // remove current element, if asked |
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272 | if (iter->base.remove) { |
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273 | // obtain mutable pointer to the map |
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274 | struct cx_mut_iterator_s *miter = it; |
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275 | struct cx_hash_map_s *map = miter->src_handle; |
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276 | |
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277 | // clear the flag |
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278 | iter->base.remove = false; |
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279 | |
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280 | // determine the next element |
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281 | struct cx_hash_map_element_s *next = elm->next; |
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282 | |
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283 | // search the previous element |
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284 | struct cx_hash_map_element_s *prev = NULL; |
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285 | if (map->buckets[iter->slot] != elm) { |
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286 | prev = map->buckets[iter->slot]; |
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287 | while (prev->next != elm) { |
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288 | prev = prev->next; |
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289 | } |
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290 | } |
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291 | |
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292 | // destroy |
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293 | cx_invoke_destructor((struct cx_map_s *) map, elm->data); |
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294 | |
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295 | // unlink |
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296 | cx_hash_map_unlink(map, iter->slot, prev, elm); |
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297 | |
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298 | // advance |
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299 | elm = next; |
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300 | } else { |
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301 | // just advance |
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302 | elm = elm->next; |
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303 | iter->index++; |
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304 | } |
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305 | |
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306 | // search the next bucket, if required |
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307 | struct cx_hash_map_s const *map = iter->src_handle; |
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308 | while (elm == NULL && ++iter->slot < map->bucket_count) { |
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309 | elm = map->buckets[iter->slot]; |
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310 | } |
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311 | |
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312 | // fill the struct with the next element |
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313 | iter->elem_handle = elm; |
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314 | if (elm == NULL) { |
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315 | iter->kv_data.key = NULL; |
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316 | iter->kv_data.value = NULL; |
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317 | } else { |
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318 | iter->kv_data.key = &elm->key; |
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319 | if (map->base.store_pointer) { |
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320 | iter->kv_data.value = *(void **) elm->data; |
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321 | } else { |
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322 | iter->kv_data.value = elm->data; |
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323 | } |
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324 | } |
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325 | } |
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326 | |
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327 | static bool cx_hash_map_iter_flag_rm(void *it) { |
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328 | struct cx_iterator_base_s *iter = it; |
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329 | if (iter->mutating) { |
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330 | iter->remove = true; |
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331 | return true; |
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332 | } else { |
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333 | return false; |
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334 | } |
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335 | } |
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336 | |
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337 | static CxIterator cx_hash_map_iterator(CxMap const *map) { |
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338 | CxIterator iter; |
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339 | |
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340 | iter.src_handle = map; |
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341 | iter.base.valid = cx_hash_map_iter_valid; |
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342 | iter.base.next = cx_hash_map_iter_next; |
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343 | iter.base.current = cx_hash_map_iter_current_entry; |
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344 | iter.base.flag_removal = cx_hash_map_iter_flag_rm; |
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345 | iter.base.remove = false; |
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346 | iter.base.mutating = false; |
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347 | |
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348 | iter.slot = 0; |
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349 | iter.index = 0; |
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350 | |
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351 | if (map->size > 0) { |
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352 | struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map; |
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353 | struct cx_hash_map_element_s *elm = hash_map->buckets[0]; |
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354 | while (elm == NULL) { |
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355 | elm = hash_map->buckets[++iter.slot]; |
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356 | } |
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357 | iter.elem_handle = elm; |
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358 | iter.kv_data.key = &elm->key; |
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359 | if (map->store_pointer) { |
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360 | iter.kv_data.value = *(void **) elm->data; |
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361 | } else { |
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362 | iter.kv_data.value = elm->data; |
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363 | } |
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364 | } else { |
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365 | iter.elem_handle = NULL; |
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366 | iter.kv_data.key = NULL; |
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367 | iter.kv_data.value = NULL; |
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368 | } |
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369 | |
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370 | return iter; |
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371 | } |
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372 | |
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373 | static CxIterator cx_hash_map_iterator_keys(CxMap const *map) { |
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374 | CxIterator iter = cx_hash_map_iterator(map); |
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375 | iter.base.current = cx_hash_map_iter_current_key; |
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376 | return iter; |
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377 | } |
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378 | |
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379 | static CxIterator cx_hash_map_iterator_values(CxMap const *map) { |
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380 | CxIterator iter = cx_hash_map_iterator(map); |
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381 | iter.base.current = cx_hash_map_iter_current_value; |
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382 | return iter; |
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383 | } |
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384 | |
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385 | static CxMutIterator cx_hash_map_mut_iterator(CxMap *map) { |
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386 | CxIterator it = cx_hash_map_iterator(map); |
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387 | it.base.mutating = true; |
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388 | |
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389 | // we know the iterators share the same memory layout |
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390 | CxMutIterator iter; |
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391 | memcpy(&iter, &it, sizeof(CxMutIterator)); |
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392 | return iter; |
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393 | } |
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394 | |
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395 | static CxMutIterator cx_hash_map_mut_iterator_keys(CxMap *map) { |
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396 | CxMutIterator iter = cx_hash_map_mut_iterator(map); |
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397 | iter.base.current = cx_hash_map_iter_current_key; |
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398 | return iter; |
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399 | } |
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400 | |
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401 | static CxMutIterator cx_hash_map_mut_iterator_values(CxMap *map) { |
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402 | CxMutIterator iter = cx_hash_map_mut_iterator(map); |
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403 | iter.base.current = cx_hash_map_iter_current_value; |
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404 | return iter; |
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405 | } |
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406 | |
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407 | static cx_map_class cx_hash_map_class = { |
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408 | cx_hash_map_destructor, |
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409 | cx_hash_map_clear, |
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410 | cx_hash_map_put, |
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411 | cx_hash_map_get, |
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412 | cx_hash_map_remove, |
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413 | cx_hash_map_iterator, |
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414 | cx_hash_map_iterator_keys, |
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415 | cx_hash_map_iterator_values, |
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416 | cx_hash_map_mut_iterator, |
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417 | cx_hash_map_mut_iterator_keys, |
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418 | cx_hash_map_mut_iterator_values, |
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419 | }; |
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420 | |
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421 | CxMap *cxHashMapCreate( |
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422 | CxAllocator const *allocator, |
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423 | size_t itemsize, |
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424 | size_t buckets |
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425 | ) { |
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426 | if (buckets == 0) { |
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427 | // implementation defined default |
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428 | buckets = 16; |
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429 | } |
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430 | |
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431 | struct cx_hash_map_s *map = cxCalloc(allocator, 1, |
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432 | sizeof(struct cx_hash_map_s)); |
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433 | if (map == NULL) return NULL; |
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434 | |
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435 | // initialize hash map members |
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436 | map->bucket_count = buckets; |
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437 | map->buckets = cxCalloc(allocator, buckets, |
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438 | sizeof(struct cx_hash_map_element_s *)); |
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439 | if (map->buckets == NULL) { |
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440 | cxFree(allocator, map); |
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441 | return NULL; |
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442 | } |
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443 | |
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444 | // initialize base members |
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445 | map->base.cl = &cx_hash_map_class; |
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446 | map->base.allocator = allocator; |
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447 | |
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448 | if (itemsize > 0) { |
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449 | map->base.store_pointer = false; |
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450 | map->base.item_size = itemsize; |
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451 | } else { |
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452 | map->base.store_pointer = true; |
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453 | map->base.item_size = sizeof(void *); |
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454 | } |
550
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455 | |
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456 | return (CxMap *) map; |
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457 | } |
562
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458 | |
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459 | int cxMapRehash(CxMap *map) { |
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460 | struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map; |
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461 | if (map->size > ((hash_map->bucket_count * 3) >> 2)) { |
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462 | |
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463 | size_t new_bucket_count = (map->size * 5) >> 1; |
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464 | struct cx_hash_map_element_s **new_buckets = cxCalloc( |
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465 | map->allocator, |
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466 | new_bucket_count, sizeof(struct cx_hash_map_element_s *) |
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467 | ); |
562
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468 | |
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469 | if (new_buckets == NULL) { |
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470 | return 1; |
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471 | } |
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472 | |
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473 | // iterate through the elements and assign them to their new slots |
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474 | cx_for_n(slot, hash_map->bucket_count) { |
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475 | struct cx_hash_map_element_s *elm = hash_map->buckets[slot]; |
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476 | while (elm != NULL) { |
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477 | struct cx_hash_map_element_s *next = elm->next; |
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478 | size_t new_slot = elm->key.hash % new_bucket_count; |
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479 | |
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480 | // find position where to insert |
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481 | struct cx_hash_map_element_s *bucket_next = new_buckets[new_slot]; |
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482 | struct cx_hash_map_element_s *bucket_prev = NULL; |
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483 | while (bucket_next != NULL && |
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484 | bucket_next->key.hash < elm->key.hash) { |
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485 | bucket_prev = bucket_next; |
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486 | bucket_next = bucket_next->next; |
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487 | } |
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488 | |
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489 | // insert |
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490 | if (bucket_prev == NULL) { |
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491 | elm->next = new_buckets[new_slot]; |
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492 | new_buckets[new_slot] = elm; |
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493 | } else { |
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494 | bucket_prev->next = elm; |
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495 | elm->next = bucket_next; |
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496 | } |
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497 | |
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498 | // advance |
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499 | elm = next; |
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500 | } |
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501 | } |
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502 | |
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503 | // assign result to the map |
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504 | hash_map->bucket_count = new_bucket_count; |
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505 | cxFree(map->allocator, hash_map->buckets); |
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506 | hash_map->buckets = new_buckets; |
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507 | } |
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508 | return 0; |
fd3368c20413
#189 #199 implement and test map rehash
Mike Becker <universe@uap-core.de>
parents:
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509 | } |