src/ucx/array_list.c

Fri, 20 Sep 2024 20:04:35 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Fri, 20 Sep 2024 20:04:35 +0200
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parent 504
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fix trace log use after free

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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 "cx/array_list.h"
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30 #include <assert.h>
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31 #include <string.h>
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32
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33 // LOW LEVEL ARRAY LIST FUNCTIONS
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34
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35 enum cx_array_copy_result cx_array_copy(
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36 void **target,
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37 size_t *size,
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38 size_t *capacity,
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39 size_t index,
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40 void const *src,
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41 size_t elem_size,
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42 size_t elem_count,
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43 struct cx_array_reallocator_s *reallocator
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44 ) {
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45 // assert pointers
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46 assert(target != NULL);
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47 assert(size != NULL);
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48 assert(src != NULL);
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49
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50 // determine capacity
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51 size_t cap = capacity == NULL ? *size : *capacity;
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52
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53 // check if resize is required
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54 size_t minsize = index + elem_count;
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55 size_t newsize = *size < minsize ? minsize : *size;
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56 bool needrealloc = newsize > cap;
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57
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58 // reallocate if possible
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59 if (needrealloc) {
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60 // a reallocator and a capacity variable must be available
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61 if (reallocator == NULL || capacity == NULL) {
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62 return CX_ARRAY_COPY_REALLOC_NOT_SUPPORTED;
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63 }
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64
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65 // check, if we need to repair the src pointer
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66 uintptr_t targetaddr = (uintptr_t) *target;
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67 uintptr_t srcaddr = (uintptr_t) src;
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68 bool repairsrc = targetaddr <= srcaddr
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69 && srcaddr < targetaddr + cap * elem_size;
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70
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71 // calculate new capacity (next number divisible by 16)
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72 cap = newsize - (newsize % 16) + 16;
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73 assert(cap > newsize);
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74
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75 // perform reallocation
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76 void *newmem = reallocator->realloc(
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77 *target, cap, elem_size, reallocator
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78 );
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79 if (newmem == NULL) {
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80 return CX_ARRAY_COPY_REALLOC_FAILED;
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81 }
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82
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83 // repair src pointer, if necessary
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84 if (repairsrc) {
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85 src = ((char *) newmem) + (srcaddr - targetaddr);
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86 }
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87
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88 // store new pointer and capacity
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89 *target = newmem;
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90 *capacity = cap;
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91 }
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92
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93 // determine target pointer
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94 char *start = *target;
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95 start += index * elem_size;
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96
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97 // copy elements and set new size
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98 memmove(start, src, elem_count * elem_size);
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99 *size = newsize;
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100
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101 // return successfully
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102 return CX_ARRAY_COPY_SUCCESS;
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103 }
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104
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105 #ifndef CX_ARRAY_SWAP_SBO_SIZE
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106 #define CX_ARRAY_SWAP_SBO_SIZE 128
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107 #endif
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108
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109 void cx_array_swap(
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110 void *arr,
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111 size_t elem_size,
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112 size_t idx1,
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113 size_t idx2
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114 ) {
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115 assert(arr != NULL);
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116
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117 // short circuit
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118 if (idx1 == idx2) return;
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119
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120 char sbo_mem[CX_ARRAY_SWAP_SBO_SIZE];
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121 void *tmp;
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122
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123 // decide if we can use the local buffer
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124 if (elem_size > CX_ARRAY_SWAP_SBO_SIZE) {
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125 tmp = malloc(elem_size);
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126 // we don't want to enforce error handling
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127 if (tmp == NULL) abort();
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128 } else {
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129 tmp = sbo_mem;
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130 }
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131
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132 // calculate memory locations
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133 char *left = arr, *right = arr;
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134 left += idx1 * elem_size;
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135 right += idx2 * elem_size;
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136
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137 // three-way swap
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138 memcpy(tmp, left, elem_size);
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139 memcpy(left, right, elem_size);
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140 memcpy(right, tmp, elem_size);
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141
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142 // free dynamic memory, if it was needed
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143 if (tmp != sbo_mem) {
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144 free(tmp);
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145 }
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146 }
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147
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148 // HIGH LEVEL ARRAY LIST FUNCTIONS
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149
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150 typedef struct {
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151 struct cx_list_s base;
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152 void *data;
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153 size_t capacity;
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154 struct cx_array_reallocator_s reallocator;
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155 } cx_array_list;
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156
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157 static void *cx_arl_realloc(
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158 void *array,
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159 size_t capacity,
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160 size_t elem_size,
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161 struct cx_array_reallocator_s *alloc
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162 ) {
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163 // retrieve the pointer to the list allocator
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164 CxAllocator const *al = alloc->ptr1;
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165
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166 // use the list allocator to reallocate the memory
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167 return cxRealloc(al, array, capacity * elem_size);
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168 }
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169
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170 static void cx_arl_destructor(struct cx_list_s *list) {
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171 cx_array_list *arl = (cx_array_list *) list;
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172
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173 char *ptr = arl->data;
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174
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175 if (list->simple_destructor) {
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176 for (size_t i = 0; i < list->size; i++) {
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177 cx_invoke_simple_destructor(list, ptr);
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178 ptr += list->item_size;
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179 }
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180 }
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181 if (list->advanced_destructor) {
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182 for (size_t i = 0; i < list->size; i++) {
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183 cx_invoke_advanced_destructor(list, ptr);
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184 ptr += list->item_size;
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185 }
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186 }
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187
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188 cxFree(list->allocator, arl->data);
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189 cxFree(list->allocator, list);
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190 }
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191
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192 static size_t cx_arl_insert_array(
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193 struct cx_list_s *list,
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194 size_t index,
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195 void const *array,
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196 size_t n
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197 ) {
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198 // out of bounds and special case check
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199 if (index > list->size || n == 0) return 0;
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200
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201 // get a correctly typed pointer to the list
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202 cx_array_list *arl = (cx_array_list *) list;
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203
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204 // do we need to move some elements?
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205 if (index < list->size) {
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206 char const *first_to_move = (char const *) arl->data;
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207 first_to_move += index * list->item_size;
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208 size_t elems_to_move = list->size - index;
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209 size_t start_of_moved = index + n;
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210
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211 if (CX_ARRAY_COPY_SUCCESS != cx_array_copy(
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212 &arl->data,
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213 &list->size,
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214 &arl->capacity,
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215 start_of_moved,
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216 first_to_move,
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217 list->item_size,
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218 elems_to_move,
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219 &arl->reallocator
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220 )) {
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221 // if moving existing elems is unsuccessful, abort
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222 return 0;
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223 }
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224 }
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225
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226 // note that if we had to move the elements, the following operation
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227 // is guaranteed to succeed, because we have the memory already allocated
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228 // therefore, it is impossible to leave this function with an invalid array
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229
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230 // place the new elements
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231 if (CX_ARRAY_COPY_SUCCESS == cx_array_copy(
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232 &arl->data,
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233 &list->size,
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234 &arl->capacity,
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235 index,
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236 array,
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237 list->item_size,
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238 n,
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239 &arl->reallocator
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240 )) {
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241 return n;
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242 } else {
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243 // array list implementation is "all or nothing"
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244 return 0;
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245 }
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246 }
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247
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248 static int cx_arl_insert_element(
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249 struct cx_list_s *list,
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250 size_t index,
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251 void const *element
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252 ) {
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253 return 1 != cx_arl_insert_array(list, index, element, 1);
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254 }
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255
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256 static int cx_arl_insert_iter(
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257 struct cx_mut_iterator_s *iter,
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258 void const *elem,
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259 int prepend
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260 ) {
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261 struct cx_list_s *list = iter->src_handle;
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262 if (iter->index < list->size) {
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263 int result = cx_arl_insert_element(
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264 list,
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265 iter->index + 1 - prepend,
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266 elem
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267 );
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268 if (result == 0 && prepend != 0) {
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269 iter->index++;
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270 iter->elem_handle = ((char *) iter->elem_handle) + list->item_size;
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271 }
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272 return result;
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273 } else {
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274 int result = cx_arl_insert_element(list, list->size, elem);
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275 iter->index = list->size;
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276 return result;
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277 }
436
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278 }
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279
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280 static int cx_arl_remove(
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281 struct cx_list_s *list,
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282 size_t index
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283 ) {
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284 cx_array_list *arl = (cx_array_list *) list;
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285
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286 // out-of-bounds check
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287 if (index >= list->size) {
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288 return 1;
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289 }
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290
490
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291 // content destruction
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292 cx_invoke_destructor(list, ((char *) arl->data) + index * list->item_size);
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293
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294 // short-circuit removal of last element
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295 if (index == list->size - 1) {
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296 list->size--;
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297 return 0;
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298 }
436
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299
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300 // just move the elements starting at index to the left
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301 int result = cx_array_copy(
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302 &arl->data,
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303 &list->size,
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304 &arl->capacity,
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305 index,
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306 ((char *) arl->data) + (index + 1) * list->item_size,
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307 list->item_size,
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308 list->size - index - 1,
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309 &arl->reallocator
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310 );
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311 if (result == 0) {
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312 // decrease the size
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313 list->size--;
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314 }
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315 return result;
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316 }
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317
490
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318 static void cx_arl_clear(struct cx_list_s *list) {
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319 if (list->size == 0) return;
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320
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321 cx_array_list *arl = (cx_array_list *) list;
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322 char *ptr = arl->data;
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323
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324 if (list->simple_destructor) {
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325 for (size_t i = 0; i < list->size; i++) {
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326 cx_invoke_simple_destructor(list, ptr);
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327 ptr += list->item_size;
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328 }
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329 }
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330 if (list->advanced_destructor) {
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331 for (size_t i = 0; i < list->size; i++) {
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332 cx_invoke_advanced_destructor(list, ptr);
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333 ptr += list->item_size;
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334 }
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335 }
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336
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337 memset(arl->data, 0, list->size * list->item_size);
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338 list->size = 0;
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339 }
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340
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341 static int cx_arl_swap(
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342 struct cx_list_s *list,
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343 size_t i,
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344 size_t j
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345 ) {
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346 if (i >= list->size || j >= list->size) return 1;
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347 cx_array_list *arl = (cx_array_list *) list;
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348 cx_array_swap(arl->data, list->item_size, i, j);
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349 return 0;
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350 }
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351
436
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352 static void *cx_arl_at(
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353 struct cx_list_s const *list,
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354 size_t index
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355 ) {
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356 if (index < list->size) {
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357 cx_array_list const *arl = (cx_array_list const *) list;
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358 char *space = arl->data;
490
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359 return space + index * list->item_size;
436
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360 } else {
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361 return NULL;
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362 }
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363 }
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364
490
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365 static ssize_t cx_arl_find(
436
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366 struct cx_list_s const *list,
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367 void const *elem
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368 ) {
490
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369 assert(list->cmpfunc != NULL);
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370 assert(list->size < SIZE_MAX / 2);
436
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371 char *cur = ((cx_array_list const *) list)->data;
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372
490
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373 for (ssize_t i = 0; i < (ssize_t) list->size; i++) {
436
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374 if (0 == list->cmpfunc(elem, cur)) {
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375 return i;
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376 }
490
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377 cur += list->item_size;
436
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378 }
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379
490
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380 return -1;
436
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381 }
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382
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383 static void cx_arl_sort(struct cx_list_s *list) {
490
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384 assert(list->cmpfunc != NULL);
436
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385 qsort(((cx_array_list *) list)->data,
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386 list->size,
490
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387 list->item_size,
436
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388 list->cmpfunc
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389 );
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390 }
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391
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392 static int cx_arl_compare(
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393 struct cx_list_s const *list,
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394 struct cx_list_s const *other
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395 ) {
490
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diff changeset
396 assert(list->cmpfunc != NULL);
438
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397 if (list->size == other->size) {
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398 char const *left = ((cx_array_list const *) list)->data;
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399 char const *right = ((cx_array_list const *) other)->data;
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400 for (size_t i = 0; i < list->size; i++) {
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401 int d = list->cmpfunc(left, right);
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402 if (d != 0) {
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403 return d;
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404 }
490
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diff changeset
405 left += list->item_size;
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406 right += other->item_size;
438
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diff changeset
407 }
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408 return 0;
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diff changeset
409 } else {
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410 return list->size < other->size ? -1 : 1;
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411 }
436
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parents:
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412 }
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parents:
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413
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414 static void cx_arl_reverse(struct cx_list_s *list) {
438
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415 if (list->size < 2) return;
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416 void *data = ((cx_array_list const *) list)->data;
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417 size_t half = list->size / 2;
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418 for (size_t i = 0; i < half; i++) {
490
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diff changeset
419 cx_array_swap(data, list->item_size, i, list->size - 1 - i);
438
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420 }
436
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421 }
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422
438
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423 static bool cx_arl_iter_valid(void const *it) {
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424 struct cx_iterator_s const *iter = it;
436
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425 struct cx_list_s const *list = iter->src_handle;
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426 return iter->index < list->size;
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parents:
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427 }
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diff changeset
428
438
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diff changeset
429 static void *cx_arl_iter_current(void const *it) {
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430 struct cx_iterator_s const *iter = it;
436
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431 return iter->elem_handle;
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parents:
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432 }
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433
438
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diff changeset
434 static void cx_arl_iter_next(void *it) {
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diff changeset
435 struct cx_iterator_base_s *itbase = it;
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parents: 436
diff changeset
436 if (itbase->remove) {
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diff changeset
437 struct cx_mut_iterator_s *iter = it;
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diff changeset
438 itbase->remove = false;
436
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439 cx_arl_remove(iter->src_handle, iter->index);
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440 } else {
438
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diff changeset
441 struct cx_iterator_s *iter = it;
436
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442 iter->index++;
438
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443 iter->elem_handle =
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diff changeset
444 ((char *) iter->elem_handle)
490
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diff changeset
445 + ((struct cx_list_s const *) iter->src_handle)->item_size;
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diff changeset
446 }
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diff changeset
447 }
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diff changeset
448
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diff changeset
449 static void cx_arl_iter_prev(void *it) {
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diff changeset
450 struct cx_iterator_base_s *itbase = it;
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diff changeset
451 struct cx_mut_iterator_s *iter = it;
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diff changeset
452 cx_array_list *const list = iter->src_handle;
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diff changeset
453 if (itbase->remove) {
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diff changeset
454 itbase->remove = false;
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diff changeset
455 cx_arl_remove(iter->src_handle, iter->index);
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diff changeset
456 }
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diff changeset
457 iter->index--;
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diff changeset
458 if (iter->index < list->base.size) {
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diff changeset
459 iter->elem_handle = ((char *) list->data)
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parents: 438
diff changeset
460 + iter->index * list->base.item_size;
438
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diff changeset
461 }
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diff changeset
462 }
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diff changeset
463
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diff changeset
464 static bool cx_arl_iter_flag_rm(void *it) {
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diff changeset
465 struct cx_iterator_base_s *iter = it;
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diff changeset
466 if (iter->mutating) {
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diff changeset
467 iter->remove = true;
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468 return true;
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diff changeset
469 } else {
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diff changeset
470 return false;
436
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parents:
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471 }
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parents:
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472 }
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parents:
diff changeset
473
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parents:
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474 static struct cx_iterator_s cx_arl_iterator(
438
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diff changeset
475 struct cx_list_s const *list,
490
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diff changeset
476 size_t index,
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parents: 438
diff changeset
477 bool backwards
436
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parents:
diff changeset
478 ) {
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parents:
diff changeset
479 struct cx_iterator_s iter;
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parents:
diff changeset
480
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diff changeset
481 iter.index = index;
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482 iter.src_handle = list;
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483 iter.elem_handle = cx_arl_at(list, index);
438
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484 iter.base.valid = cx_arl_iter_valid;
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485 iter.base.current = cx_arl_iter_current;
490
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486 iter.base.next = backwards ? cx_arl_iter_prev : cx_arl_iter_next;
438
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487 iter.base.flag_removal = cx_arl_iter_flag_rm;
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488 iter.base.remove = false;
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489 iter.base.mutating = false;
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490
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491 return iter;
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492 }
436
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493
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494 static cx_list_class cx_array_list_class = {
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495 cx_arl_destructor,
490
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496 cx_arl_insert_element,
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497 cx_arl_insert_array,
436
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498 cx_arl_insert_iter,
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499 cx_arl_remove,
490
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500 cx_arl_clear,
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501 cx_arl_swap,
436
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502 cx_arl_at,
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503 cx_arl_find,
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504 cx_arl_sort,
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505 cx_arl_compare,
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506 cx_arl_reverse,
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507 cx_arl_iterator,
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508 };
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509
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510 CxList *cxArrayListCreate(
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511 CxAllocator const *allocator,
490
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512 cx_compare_func comparator,
436
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513 size_t item_size,
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514 size_t initial_capacity
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515 ) {
490
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516 if (allocator == NULL) {
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517 allocator = cxDefaultAllocator;
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518 }
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519
436
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520 cx_array_list *list = cxCalloc(allocator, 1, sizeof(cx_array_list));
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521 if (list == NULL) return NULL;
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522
490
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523 list->base.cl = &cx_array_list_class;
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524 list->base.allocator = allocator;
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525 list->base.cmpfunc = comparator;
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526 list->capacity = initial_capacity;
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527
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528 if (item_size > 0) {
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529 list->base.item_size = item_size;
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530 } else {
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531 item_size = sizeof(void *);
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532 cxListStorePointers((CxList *) list);
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533 }
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534
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535 // allocate the array after the real item_size is known
436
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536 list->data = cxCalloc(allocator, initial_capacity, item_size);
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537 if (list->data == NULL) {
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538 cxFree(allocator, list);
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539 return NULL;
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540 }
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541
438
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542 // configure the reallocator
436
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543 list->reallocator.realloc = cx_arl_realloc;
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544 list->reallocator.ptr1 = (void *) allocator;
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545
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546 return (CxList *) list;
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547 }

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