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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 * \file allocator.h |
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30 * Interface for custom allocators. |
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31 */ |
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32 |
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33 #ifndef UCX_ALLOCATOR_H |
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34 #define UCX_ALLOCATOR_H |
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35 |
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36 #include "common.h" |
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37 |
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38 #ifdef __cplusplus |
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39 extern "C" { |
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40 #endif |
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41 |
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42 /** |
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43 * The class definition for an allocator. |
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44 */ |
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45 typedef struct { |
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46 /** |
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47 * The allocator's malloc() implementation. |
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48 */ |
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49 void *(*malloc)( |
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50 void *data, |
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51 size_t n |
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52 ); |
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53 |
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54 /** |
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55 * The allocator's realloc() implementation. |
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56 */ |
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57 void *(*realloc)( |
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58 void *data, |
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59 void *mem, |
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60 size_t n |
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61 ) |
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62 __attribute__((__warn_unused_result__)); |
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63 |
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64 /** |
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65 * The allocator's calloc() implementation. |
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66 */ |
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67 void *(*calloc)( |
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68 void *data, |
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69 size_t nelem, |
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70 size_t n |
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71 ); |
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72 |
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73 /** |
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74 * The allocator's free() implementation. |
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75 */ |
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76 void (*free)( |
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77 void *data, |
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78 void *mem |
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79 ) |
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80 __attribute__((__nonnull__)); |
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81 } cx_allocator_class; |
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82 |
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83 /** |
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84 * Structure holding the data for an allocator. |
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85 */ |
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86 struct cx_allocator_s { |
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87 /** |
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88 * A pointer to the instance of the allocator class. |
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89 */ |
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90 cx_allocator_class *cl; |
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91 /** |
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92 * A pointer to the data this allocator uses. |
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93 */ |
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94 void *data; |
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95 }; |
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96 |
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97 /** |
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98 * High-Level type alias for the allocator type. |
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99 */ |
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100 typedef struct cx_allocator_s CxAllocator; |
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101 |
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102 /** |
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103 * A default allocator using standard library malloc() etc. |
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104 */ |
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105 extern CxAllocator *cxDefaultAllocator; |
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106 |
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107 /** |
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108 * Function pointer type for destructor functions. |
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109 * |
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110 * A destructor function deallocates possible contents and MAY free the memory |
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111 * pointed to by \p memory. Read the documentation of the respective function |
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112 * pointer to learn if a destructor SHALL, MAY, or MUST NOT free the memory in that |
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113 * particular implementation. |
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114 * |
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115 * @param memory a pointer to the object to destruct |
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116 */ |
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117 typedef void (*cx_destructor_func)(void *memory) __attribute__((__nonnull__)); |
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118 |
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119 /** |
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120 * Function pointer type for destructor functions. |
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121 * |
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122 * A destructor function deallocates possible contents and MAY free the memory |
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123 * pointed to by \p memory. Read the documentation of the respective function |
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124 * pointer to learn if a destructor SHALL, MAY, or MUST NOT free the memory in that |
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125 * particular implementation. |
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126 * |
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127 * @param data an optional pointer to custom data |
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128 * @param memory a pointer to the object to destruct |
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129 */ |
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130 typedef void (*cx_destructor_func2)( |
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131 void *data, |
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132 void *memory |
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133 ) __attribute__((__nonnull__(2))); |
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134 |
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135 /** |
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136 * Re-allocate a previously allocated block and changes the pointer in-place, if necessary. |
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137 * |
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138 * \par Error handling |
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139 * \c errno will be set by realloc() on failure. |
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140 * |
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141 * @param mem pointer to the pointer to allocated block |
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142 * @param n the new size in bytes |
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143 * @return zero on success, non-zero on failure |
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144 */ |
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145 int cx_reallocate( |
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146 void **mem, |
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147 size_t n |
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148 ) |
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149 __attribute__((__nonnull__)); |
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150 |
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151 /** |
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152 * Allocate \p n bytes of memory. |
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153 * |
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154 * @param allocator the allocator |
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155 * @param n the number of bytes |
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156 * @return a pointer to the allocated memory |
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157 */ |
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158 void *cxMalloc( |
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159 CxAllocator const *allocator, |
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160 size_t n |
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161 ) |
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162 __attribute__((__malloc__)) |
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163 __attribute__((__alloc_size__(2))); |
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164 |
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165 /** |
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166 * Re-allocate the previously allocated block in \p mem, making the new block \p n bytes long. |
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167 * This function may return the same pointer that was passed to it, if moving the memory |
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168 * was not necessary. |
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169 * |
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170 * \note Re-allocating a block allocated by a different allocator is undefined. |
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171 * |
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172 * @param allocator the allocator |
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173 * @param mem pointer to the previously allocated block |
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174 * @param n the new size in bytes |
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175 * @return a pointer to the re-allocated memory |
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176 */ |
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177 void *cxRealloc( |
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178 CxAllocator const *allocator, |
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179 void *mem, |
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180 size_t n |
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181 ) |
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182 __attribute__((__warn_unused_result__)) |
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183 __attribute__((__alloc_size__(3))); |
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184 |
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185 /** |
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186 * Re-allocate a previously allocated block and changes the pointer in-place, if necessary. |
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187 * This function acts like cxRealloc() using the pointer pointed to by \p mem. |
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188 * |
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189 * \note Re-allocating a block allocated by a different allocator is undefined. |
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190 * |
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191 * \par Error handling |
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192 * \c errno will be set, if the underlying realloc function does so. |
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193 * |
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194 * @param allocator the allocator |
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195 * @param mem pointer to the pointer to allocated block |
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196 * @param n the new size in bytes |
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197 * @return zero on success, non-zero on failure |
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198 */ |
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199 int cxReallocate( |
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200 CxAllocator const *allocator, |
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201 void **mem, |
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202 size_t n |
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203 ) |
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204 __attribute__((__nonnull__)); |
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205 |
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206 /** |
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207 * Allocate \p nelem elements of \p n bytes each, all initialized to zero. |
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208 * |
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209 * @param allocator the allocator |
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210 * @param nelem the number of elements |
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211 * @param n the size of each element in bytes |
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212 * @return a pointer to the allocated memory |
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213 */ |
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214 void *cxCalloc( |
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215 CxAllocator const *allocator, |
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216 size_t nelem, |
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217 size_t n |
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218 ) |
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219 __attribute__((__malloc__)) |
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220 __attribute__((__alloc_size__(2, 3))); |
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221 |
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222 /** |
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223 * Free a block allocated by this allocator. |
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224 * |
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225 * \note Freeing a block of a different allocator is undefined. |
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226 * |
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227 * @param allocator the allocator |
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228 * @param mem a pointer to the block to free |
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229 */ |
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230 void cxFree( |
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231 CxAllocator const *allocator, |
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232 void *mem |
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233 ) |
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234 __attribute__((__nonnull__)); |
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235 |
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236 #ifdef __cplusplus |
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237 } // extern "C" |
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238 #endif |
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239 |
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240 #endif // UCX_ALLOCATOR_H |