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13 | 1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
13 | 3 | * |
259 | 4 | * Copyright 2017 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. |
13 | 27 | */ |
28 | ||
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29 | #include "ucx/stack.h" |
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30 | |
13 | 31 | #include <string.h> |
32 | ||
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33 | static size_t ucx_stack_align(size_t n) { |
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34 | int align = n % sizeof(void*); |
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35 | if (align) { |
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36 | n += sizeof(void*) - align; |
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37 | } |
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38 | return n; |
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39 | } |
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40 | |
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41 | void ucx_stack_init(UcxStack *stack, char* space, size_t size) { |
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42 | stack->size = size - size % sizeof(void*); |
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43 | stack->space = space; |
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44 | stack->top = NULL; |
182 | 45 | |
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46 | stack->allocator.pool = stack; |
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47 | stack->allocator.malloc = (ucx_allocator_malloc) ucx_stack_malloc; |
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48 | stack->allocator.calloc = (ucx_allocator_calloc) ucx_stack_calloc; |
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49 | stack->allocator.realloc = (ucx_allocator_realloc) ucx_stack_realloc; |
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50 | stack->allocator.free = (ucx_allocator_free) ucx_stack_free; |
13 | 51 | } |
52 | ||
182 | 53 | void *ucx_stack_malloc(UcxStack *stack, size_t n) { |
54 | ||
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55 | if (ucx_stack_avail(stack) < ucx_stack_align(n)) { |
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56 | return NULL; |
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57 | } else { |
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58 | char *prev = stack->top; |
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59 | if (stack->top) { |
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60 | stack->top += ucx_stack_align(ucx_stack_topsize(stack)); |
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61 | } else { |
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62 | stack->top = stack->space; |
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63 | } |
182 | 64 | |
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65 | ((struct ucx_stack_metadata*)stack->top)->prev = prev; |
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66 | ((struct ucx_stack_metadata*)stack->top)->size = n; |
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67 | stack->top += sizeof(struct ucx_stack_metadata); |
182 | 68 | |
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69 | return stack->top; |
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70 | } |
13 | 71 | } |
72 | ||
182 | 73 | void *ucx_stack_calloc(UcxStack *stack, size_t nelem, size_t elsize) { |
74 | void *mem = ucx_stack_malloc(stack, nelem*elsize); | |
75 | memset(mem, 0, nelem*elsize); | |
76 | return mem; | |
13 | 77 | } |
78 | ||
182 | 79 | void *ucx_stack_realloc(UcxStack *stack, void *ptr, size_t n) { |
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80 | if (ptr == stack->top) { |
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81 | if (stack->size - (stack->top - stack->space) < ucx_stack_align(n)) { |
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82 | return NULL; |
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83 | } else { |
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84 | ((struct ucx_stack_metadata*)stack->top - 1)->size = n; |
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85 | return ptr; |
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86 | } |
182 | 87 | } else { |
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88 | if (ucx_stack_align(((struct ucx_stack_metadata*)ptr - 1)->size) < |
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89 | ucx_stack_align(n)) { |
182 | 90 | void *nptr = ucx_stack_malloc(stack, n); |
91 | if (nptr) { | |
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92 | memcpy(nptr, ptr, n); |
182 | 93 | ucx_stack_free(stack, ptr); |
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94 | |
182 | 95 | return nptr; |
96 | } else { | |
97 | return NULL; | |
14 | 98 | } |
182 | 99 | } else { |
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100 | ((struct ucx_stack_metadata*)ptr - 1)->size = n; |
182 | 101 | return ptr; |
13 | 102 | } |
103 | } | |
104 | } | |
105 | ||
182 | 106 | void ucx_stack_free(UcxStack *stack, void *ptr) { |
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107 | if (ptr == stack->top) { |
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108 | stack->top = ((struct ucx_stack_metadata*) stack->top - 1)->prev; |
182 | 109 | } else { |
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110 | struct ucx_stack_metadata *next = (struct ucx_stack_metadata*)( |
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111 | (char*)ptr + |
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112 | ucx_stack_align(((struct ucx_stack_metadata*) ptr - 1)->size) |
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113 | ); |
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114 | next->prev = ((struct ucx_stack_metadata*) ptr - 1)->prev; |
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115 | } |
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116 | } |
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117 | |
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118 | void ucx_stack_popn(UcxStack *stack, void *dest, size_t n) { |
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119 | if (ucx_stack_empty(stack)) { |
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120 | return; |
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121 | } |
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122 | |
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123 | if (dest) { |
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124 | size_t len = ucx_stack_topsize(stack); |
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125 | if (len > n) { |
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126 | len = n; |
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127 | } |
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128 | |
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129 | memcpy(dest, stack->top, len); |
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130 | } |
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131 | |
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132 | ucx_stack_free(stack, stack->top); |
13 | 133 | } |
134 | ||
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135 | size_t ucx_stack_avail(UcxStack *stack) { |
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136 | size_t avail = ((stack->top ? (stack->size |
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137 | - (stack->top - stack->space) |
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138 | - ucx_stack_align(ucx_stack_topsize(stack))) |
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139 | : stack->size)); |
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140 | |
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141 | if (avail > sizeof(struct ucx_stack_metadata)) { |
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142 | return avail - sizeof(struct ucx_stack_metadata); |
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143 | } else { |
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144 | return 0; |
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145 | } |
13 | 146 | } |
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147 | |
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148 | void *ucx_stack_push(UcxStack *stack, size_t n, const void *data) { |
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149 | void *space = ucx_stack_malloc(stack, n); |
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150 | if (space) { |
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151 | memcpy(space, data, n); |
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152 | } |
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153 | return space; |
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154 | } |
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155 | |
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156 | void *ucx_stack_pusharr(UcxStack *stack, |
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157 | size_t nelem, size_t elsize, const void *data) { |
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158 | |
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159 | // skip the memset by using malloc |
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160 | void *space = ucx_stack_malloc(stack, nelem*elsize); |
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161 | if (space) { |
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162 | memcpy(space, data, nelem*elsize); |
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163 | } |
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164 | return space; |
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165 | } |