Mercurial > repos > rhope
annotate runtime/fixed_alloc.c @ 71:c40c3d399133
Add Int32@String and Get Char. Fix stack bug
author | Mike Pavone <pavone@retrodev.com> |
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date | Fri, 18 Jun 2010 15:07:09 -0400 |
parents | d1569087348f |
children | 5a195ee08eac |
rev | line source |
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1 #include "fixed_alloc.h" |
67 | 2 #include <stdlib.h> |
48
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3 #include <string.h> |
41
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4 |
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5 uint16_t max_free[(MAX_SIZE-MIN_SIZE)/STRIDE]; |
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6 |
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7 void fixed_alloc_init() |
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8 { |
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9 int i; |
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10 for(i = 0; i < (MAX_SIZE-MIN_SIZE)/STRIDE; ++i) |
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11 max_free[i] = (BLOCK_SIZE - sizeof(mem_block)+1)*8/((i*STRIDE+MIN_SIZE)*8+1); |
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12 } |
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13 |
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14 mem_manager * new_mem_manager() |
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15 { |
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16 int i; |
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17 mem_manager * ret = malloc(sizeof(mem_manager)); |
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18 memset(ret, 0, sizeof(mem_manager)); |
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19 return ret; |
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20 } |
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21 |
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22 void * falloc(size_t size, mem_manager * manager) |
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23 { |
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24 uint16_t i,bit; |
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25 uint16_t bucket; |
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26 mem_block * block,*temp; |
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27 if(size > MAX_SIZE) |
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28 return malloc(size); |
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29 //puts("falloc"); |
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30 size = ADJUST_SIZE(size); |
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31 bucket = (size-MIN_SIZE)/STRIDE; |
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32 block = manager->inuse[bucket]; |
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33 if(!block) |
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34 { |
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35 block = manager->freelist; |
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36 if(block) |
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37 { |
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38 --manager->freecount; |
67 | 39 manager->freelist = block->next; |
40 //memset(block, 0xCD, BLOCK_SIZE); | |
41
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41 } |
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42 else |
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43 { |
67 | 44 block = block_alloc(BLOCK_SIZE); |
45 //memset(block, 0xAB, BLOCK_SIZE); | |
41
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46 } |
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47 manager->inuse[bucket] = block; |
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48 block->next = NULL; |
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49 block->last = NULL; |
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50 block->numfree = max_free[bucket]; |
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51 block->firstfree = 0; |
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52 memset(block->bitmap, 0xFF, max_free[bucket]/8+1); |
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53 } |
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54 //printf("block: %X,numfree: %d, firstfree: %d, maxfree: %d\n", block, block->numfree, block->firstfree, max_free[bucket]); |
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55 /*if(block->numfree > max_free[bucket]) |
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56 { |
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57 puts("uh oh!"); |
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58 exit(1); |
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59 }*/ |
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60 //find first free |
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61 i = block->firstfree; |
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62 while(!block->bitmap[i]) |
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63 ++i; |
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64 //printf("i:%d,bitmap:%X\n", i, block->bitmap[i]); |
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65 bit = 0; |
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66 while(!((1 << bit) & block->bitmap[i])) |
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67 ++bit; |
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68 //update free bitmask |
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69 block->bitmap[i] ^= 1 << bit; |
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70 //If current bitmap has no more free elements, set firstfree to the next bitmap |
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71 if(!block->bitmap[i]) |
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72 block->firstfree = i+1; |
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73 else |
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74 block->firstfree = i; |
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75 --block->numfree; |
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76 if(!block->numfree) |
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77 { |
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78 //Remove from linked list if there are no more free elements |
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79 manager->inuse[bucket] = block->next; |
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80 if(block->next) |
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81 block->next->last = block->last; |
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82 } |
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83 i = i*8+bit; |
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84 return (void *)(((char *)block)+BLOCK_SIZE-((i+1)*size)); |
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85 } |
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86 |
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87 void ffree(void * ptr, size_t size, mem_manager * manager) |
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88 { |
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89 mem_block * block,*temp; |
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90 uint16_t i,bit,bucket; |
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91 if(size > MAX_SIZE) |
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92 { |
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93 free(ptr); |
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94 return; |
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95 } |
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96 //puts("ffree"); |
67 | 97 size = ADJUST_SIZE(size); |
98 //memset(ptr, 0xEF, size); | |
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99 block = GET_BLOCK(ptr); |
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100 i = (((((char *)block) + BLOCK_SIZE) - ((char *)ptr))/size)-1; |
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101 bit = i & 0x7; |
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102 i = (i&0xFFFFFFF8) >> 3; |
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103 //printf("ptr:%X,block:%X,i:%d,bit:%d\n", ptr,block,bit,i); |
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104 block->bitmap[i] |= 1 << bit; |
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105 if(i < block->firstfree) |
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106 block->firstfree = i; |
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107 ++block->numfree; |
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108 bucket = (size-MIN_SIZE)/STRIDE; |
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109 //printf("numfree:%d,max_free:%d,last:%X,next:%X\n", block->numfree, max_free[bucket], block->last, block->next); |
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110 /*if(block->numfree > max_free[bucket]) |
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111 { |
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112 puts("uh oh!"); |
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113 exit(1); |
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114 }*/ |
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115 if(block->numfree == max_free[bucket]) |
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116 { |
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117 //Block is now unused, remove it from the inuse list |
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118 if(block->last) |
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119 block->last->next = block->next; |
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120 else |
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121 manager->inuse[bucket] = block->next; |
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122 if(block->next) |
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123 block->next->last = block->last; |
67 | 124 if(manager->freecount == MAX_FREE) |
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125 { |
67 | 126 block_free(block, BLOCK_SIZE); |
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127 } |
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128 else |
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129 { |
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130 block->next = manager->freelist; |
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131 manager->freelist = block; |
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132 ++manager->freecount; |
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133 } |
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134 } else if(block->numfree == 1) { |
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135 //Block was previously full, add it to the inuse list |
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136 block->next = manager->inuse[bucket]; |
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137 block->last = NULL; |
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138 manager->inuse[bucket] = block; |
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139 if(block->next) |
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140 block->next->last = block; |
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141 } else if(block->next && block->next->numfree < block->numfree) { |
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142 //We want to use more filled blockes before less filled ones |
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143 //so we can return empty ones to the OS more often |
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144 //so if we now have more free nodes in this block than the |
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145 //next one swap them |
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146 temp = block->next; |
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147 block->next = temp->next; |
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148 temp->last = block->last; |
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149 block->last = temp; |
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150 temp->next = block; |
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151 if(block->next) |
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152 block->next->last = block; |
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153 if(temp->last) |
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154 temp->last->next = temp; |
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155 else |
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156 manager->inuse[bucket] = temp; |
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157 } |
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158 } |