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1 /**
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2 * vec - a tiny SIMD vector library in C99
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3 *
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4 * Copyright (c) 2024 Paper
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5 *
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6 * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 * of this software and associated documentation files (the "Software"), to deal
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8 * in the Software without restriction, including without limitation the rights
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9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 * copies of the Software, and to permit persons to whom the Software is
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11 * furnished to do so, subject to the following conditions:
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12 *
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13 * The above copyright notice and this permission notice shall be included in all
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14 * copies or substantial portions of the Software.
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15 *
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16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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22 * SOFTWARE.
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23 **/
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24
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25 #include "vec/mem.h"
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26
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27 #include <stdlib.h>
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28 #include <string.h>
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29
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30 #define VEC_MALLOC_ALIGNMENT (64)
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31
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32 VEC_STATIC_ASSERT(!(VEC_MALLOC_ALIGNMENT & (VEC_MALLOC_ALIGNMENT - 1))
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33 && (VEC_MALLOC_ALIGNMENT > 0),
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34 "VEC_MALLOC_ALIGNMENT must be a power of two");
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35
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36 typedef unsigned char vec_alignment_type;
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37
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38 #define VEC_MALLOC_ADDITIONAL_SIZE (sizeof(vec_alignment_type) + (VEC_MALLOC_ALIGNMENT - 1))
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39 #define VEC_MALLOC_MAX_SIZE (SIZE_MAX - VEC_MALLOC_ADDITIONAL_SIZE)
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40
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41 VEC_FUNC_IMPL void *vec_align_ptr(void *q)
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42 {
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43 vec_alignment_type diff;
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44
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45 diff = (((uintptr_t)q + (VEC_MALLOC_ALIGNMENT - 1)) & ~(VEC_MALLOC_ALIGNMENT - 1)) - (uintptr_t)q;
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46 q = (char *)q + diff;
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47
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48 memcpy((char *)q - sizeof(diff), &diff, sizeof(diff));
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49
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50 return q;
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51 }
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52
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53 /* reverses vec_align_ptr */
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54 VEC_FUNC_IMPL void *vec_unalign_ptr(void *q)
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55 {
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56 vec_alignment_type diff;
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57
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58 memcpy(&diff, (char *)q - sizeof(diff), sizeof(diff));
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59 q = (char *)q - diff;
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60
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61 return q;
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62 }
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63
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64 void *vec_malloc(size_t size)
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65 {
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66 void *q;
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67
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68 if (size > VEC_MALLOC_MAX_SIZE)
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69 return NULL;
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70
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71 /* allocate space for the diff (we have to do this,
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72 * for realloc has no way of knowing the original ptr) */
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73 q = malloc(size + VEC_MALLOC_ADDITIONAL_SIZE);
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74 if (!q)
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75 return NULL;
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76
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77 return vec_align_ptr(q);
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78 }
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79
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80 void *vec_calloc(size_t count, size_t nmemb)
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81 {
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82 size_t size;
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83 void *q;
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84
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85 size = count * nmemb;
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86 if (size && size / count != nmemb)
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87 return NULL; /* nope */
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88
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89 q = vec_malloc(size);
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90
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91 if (q)
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92 memset(q, 0, size);
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93
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94 return q;
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95 }
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96
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97 void *vec_realloc(void *ptr, size_t newsize)
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98 {
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99 vec_alignment_type diff;
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100 void *q;
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101
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102 if (!ptr)
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103 return vec_malloc(newsize);
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104
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105 if (newsize > VEC_MALLOC_MAX_SIZE)
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106 return NULL;
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107
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108 q = realloc(vec_unalign_ptr(ptr), VEC_MALLOC_ADDITIONAL_SIZE);
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109 if (!q)
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110 return NULL;
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111
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112 return vec_align_ptr(q);
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113 }
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114
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115 void vec_free(void *ptr)
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116 {
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117 if (ptr)
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118 free(vec_unalign_ptr(ptr));
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119 }
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