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1901 | serge | 1 | /* |
2 | * Copyright © 2008 Intel Corporation |
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3 | * |
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4 | * Permission is hereby granted, free of charge, to any person obtaining a |
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5 | * copy of this software and associated documentation files (the "Software"), |
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6 | * to deal in the Software without restriction, including without limitation |
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7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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8 | * and/or sell copies of the Software, and to permit persons to whom the |
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9 | * Software is furnished to do so, subject to the following conditions: |
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10 | * |
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11 | * The above copyright notice and this permission notice (including the next |
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12 | * paragraph) shall be included in all copies or substantial portions of the |
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13 | * Software. |
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14 | * |
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15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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21 | * DEALINGS IN THE SOFTWARE. |
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22 | */ |
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23 | |||
24 | #include "main/imports.h" |
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25 | #include "symbol_table.h" |
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26 | #include "hash_table.h" |
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27 | |||
28 | struct symbol { |
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29 | /** |
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30 | * Link to the next symbol in the table with the same name |
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31 | * |
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32 | * The linked list of symbols with the same name is ordered by scope |
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33 | * from inner-most to outer-most. |
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34 | */ |
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35 | struct symbol *next_with_same_name; |
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36 | |||
37 | |||
38 | /** |
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39 | * Link to the next symbol in the table with the same scope |
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40 | * |
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41 | * The linked list of symbols with the same scope is unordered. Symbols |
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42 | * in this list my have unique names. |
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43 | */ |
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44 | struct symbol *next_with_same_scope; |
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45 | |||
46 | |||
47 | /** |
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48 | * Header information for the list of symbols with the same name. |
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49 | */ |
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50 | struct symbol_header *hdr; |
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51 | |||
52 | |||
53 | /** |
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54 | * Name space of the symbol |
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55 | * |
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56 | * Name space are arbitrary user assigned integers. No two symbols can |
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57 | * exist in the same name space at the same scope level. |
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58 | */ |
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59 | int name_space; |
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60 | |||
61 | /** Scope depth where this symbol was defined. */ |
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62 | unsigned depth; |
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63 | |||
64 | /** |
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65 | * Arbitrary user supplied data. |
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66 | */ |
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67 | void *data; |
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68 | }; |
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69 | |||
70 | |||
71 | /** |
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72 | */ |
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73 | struct symbol_header { |
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74 | /** Linkage in list of all headers in a given symbol table. */ |
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75 | struct symbol_header *next; |
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76 | |||
77 | /** Symbol name. */ |
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78 | char *name; |
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79 | |||
80 | /** Linked list of symbols with the same name. */ |
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81 | struct symbol *symbols; |
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82 | }; |
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83 | |||
84 | |||
85 | /** |
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86 | * Element of the scope stack. |
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87 | */ |
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88 | struct scope_level { |
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89 | /** Link to next (inner) scope level. */ |
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90 | struct scope_level *next; |
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91 | |||
92 | /** Linked list of symbols with the same scope. */ |
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93 | struct symbol *symbols; |
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94 | }; |
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95 | |||
96 | |||
97 | /** |
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98 | * |
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99 | */ |
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100 | struct _mesa_symbol_table { |
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101 | /** Hash table containing all symbols in the symbol table. */ |
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102 | struct hash_table *ht; |
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103 | |||
104 | /** Top of scope stack. */ |
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105 | struct scope_level *current_scope; |
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106 | |||
107 | /** List of all symbol headers in the table. */ |
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108 | struct symbol_header *hdr; |
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109 | |||
110 | /** Current scope depth. */ |
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111 | unsigned depth; |
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112 | }; |
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113 | |||
114 | |||
115 | struct _mesa_symbol_table_iterator { |
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116 | /** |
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117 | * Name space of symbols returned by this iterator. |
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118 | */ |
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119 | int name_space; |
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120 | |||
121 | |||
122 | /** |
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123 | * Currently iterated symbol |
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124 | * |
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125 | * The next call to \c _mesa_symbol_table_iterator_get will return this |
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126 | * value. It will also update this value to the value that should be |
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127 | * returned by the next call. |
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128 | */ |
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129 | struct symbol *curr; |
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130 | }; |
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131 | |||
132 | |||
133 | static void |
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134 | check_symbol_table(struct _mesa_symbol_table *table) |
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135 | { |
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136 | #if 1 |
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137 | struct scope_level *scope; |
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138 | |||
139 | for (scope = table->current_scope; scope != NULL; scope = scope->next) { |
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140 | struct symbol *sym; |
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141 | |||
142 | for (sym = scope->symbols |
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143 | ; sym != NULL |
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144 | ; sym = sym->next_with_same_name) { |
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145 | const struct symbol_header *const hdr = sym->hdr; |
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146 | struct symbol *sym2; |
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147 | |||
148 | for (sym2 = hdr->symbols |
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149 | ; sym2 != NULL |
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150 | ; sym2 = sym2->next_with_same_name) { |
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151 | assert(sym2->hdr == hdr); |
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152 | } |
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153 | } |
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154 | } |
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155 | #endif |
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156 | } |
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157 | |||
158 | void |
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159 | _mesa_symbol_table_pop_scope(struct _mesa_symbol_table *table) |
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160 | { |
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161 | struct scope_level *const scope = table->current_scope; |
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162 | struct symbol *sym = scope->symbols; |
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163 | |||
164 | table->current_scope = scope->next; |
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165 | table->depth--; |
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166 | |||
167 | free(scope); |
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168 | |||
169 | while (sym != NULL) { |
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170 | struct symbol *const next = sym->next_with_same_scope; |
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171 | struct symbol_header *const hdr = sym->hdr; |
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172 | |||
173 | assert(hdr->symbols == sym); |
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174 | |||
175 | hdr->symbols = sym->next_with_same_name; |
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176 | |||
177 | free(sym); |
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178 | |||
179 | sym = next; |
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180 | } |
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181 | |||
182 | check_symbol_table(table); |
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183 | } |
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184 | |||
185 | |||
186 | void |
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187 | _mesa_symbol_table_push_scope(struct _mesa_symbol_table *table) |
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188 | { |
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189 | struct scope_level *const scope = calloc(1, sizeof(*scope)); |
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190 | |||
191 | scope->next = table->current_scope; |
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192 | table->current_scope = scope; |
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193 | table->depth++; |
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194 | } |
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195 | |||
196 | |||
197 | static struct symbol_header * |
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198 | find_symbol(struct _mesa_symbol_table *table, const char *name) |
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199 | { |
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200 | return (struct symbol_header *) hash_table_find(table->ht, name); |
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201 | } |
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202 | |||
203 | |||
204 | struct _mesa_symbol_table_iterator * |
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205 | _mesa_symbol_table_iterator_ctor(struct _mesa_symbol_table *table, |
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206 | int name_space, const char *name) |
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207 | { |
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208 | struct _mesa_symbol_table_iterator *iter = calloc(1, sizeof(*iter)); |
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209 | struct symbol_header *const hdr = find_symbol(table, name); |
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210 | |||
211 | iter->name_space = name_space; |
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212 | |||
213 | if (hdr != NULL) { |
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214 | struct symbol *sym; |
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215 | |||
216 | for (sym = hdr->symbols; sym != NULL; sym = sym->next_with_same_name) { |
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217 | assert(sym->hdr == hdr); |
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218 | |||
219 | if ((name_space == -1) || (sym->name_space == name_space)) { |
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220 | iter->curr = sym; |
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221 | break; |
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222 | } |
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223 | } |
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224 | } |
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225 | |||
226 | return iter; |
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227 | } |
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228 | |||
229 | |||
230 | void |
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231 | _mesa_symbol_table_iterator_dtor(struct _mesa_symbol_table_iterator *iter) |
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232 | { |
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233 | free(iter); |
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234 | } |
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235 | |||
236 | |||
237 | void * |
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238 | _mesa_symbol_table_iterator_get(struct _mesa_symbol_table_iterator *iter) |
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239 | { |
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240 | return (iter->curr == NULL) ? NULL : iter->curr->data; |
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241 | } |
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242 | |||
243 | |||
244 | int |
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245 | _mesa_symbol_table_iterator_next(struct _mesa_symbol_table_iterator *iter) |
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246 | { |
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247 | struct symbol_header *hdr; |
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248 | |||
249 | if (iter->curr == NULL) { |
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250 | return 0; |
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251 | } |
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252 | |||
253 | hdr = iter->curr->hdr; |
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254 | iter->curr = iter->curr->next_with_same_name; |
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255 | |||
256 | while (iter->curr != NULL) { |
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257 | assert(iter->curr->hdr == hdr); |
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258 | |||
259 | if ((iter->name_space == -1) |
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260 | || (iter->curr->name_space == iter->name_space)) { |
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261 | return 1; |
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262 | } |
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263 | |||
264 | iter->curr = iter->curr->next_with_same_name; |
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265 | } |
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266 | |||
267 | return 0; |
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268 | } |
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269 | |||
270 | |||
271 | /** |
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272 | * Determine the scope "distance" of a symbol from the current scope |
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273 | * |
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274 | * \return |
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275 | * A non-negative number for the number of scopes between the current scope |
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276 | * and the scope where a symbol was defined. A value of zero means the current |
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277 | * scope. A negative number if the symbol does not exist. |
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278 | */ |
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279 | int |
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280 | _mesa_symbol_table_symbol_scope(struct _mesa_symbol_table *table, |
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281 | int name_space, const char *name) |
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282 | { |
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283 | struct symbol_header *const hdr = find_symbol(table, name); |
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284 | struct symbol *sym; |
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285 | |||
286 | if (hdr != NULL) { |
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287 | for (sym = hdr->symbols; sym != NULL; sym = sym->next_with_same_name) { |
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288 | assert(sym->hdr == hdr); |
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289 | |||
290 | if ((name_space == -1) || (sym->name_space == name_space)) { |
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291 | assert(sym->depth <= table->depth); |
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292 | return sym->depth - table->depth; |
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293 | } |
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294 | } |
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295 | } |
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296 | |||
297 | return -1; |
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298 | } |
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299 | |||
300 | |||
301 | void * |
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302 | _mesa_symbol_table_find_symbol(struct _mesa_symbol_table *table, |
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303 | int name_space, const char *name) |
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304 | { |
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305 | struct symbol_header *const hdr = find_symbol(table, name); |
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306 | |||
307 | if (hdr != NULL) { |
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308 | struct symbol *sym; |
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309 | |||
310 | |||
311 | for (sym = hdr->symbols; sym != NULL; sym = sym->next_with_same_name) { |
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312 | assert(sym->hdr == hdr); |
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313 | |||
314 | if ((name_space == -1) || (sym->name_space == name_space)) { |
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315 | return sym->data; |
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316 | } |
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317 | } |
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318 | } |
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319 | |||
320 | return NULL; |
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321 | } |
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322 | |||
323 | |||
324 | int |
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325 | _mesa_symbol_table_add_symbol(struct _mesa_symbol_table *table, |
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326 | int name_space, const char *name, |
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327 | void *declaration) |
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328 | { |
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329 | struct symbol_header *hdr; |
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330 | struct symbol *sym; |
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331 | |||
332 | check_symbol_table(table); |
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333 | |||
334 | hdr = find_symbol(table, name); |
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335 | |||
336 | check_symbol_table(table); |
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337 | |||
338 | if (hdr == NULL) { |
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339 | hdr = calloc(1, sizeof(*hdr)); |
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340 | hdr->name = strdup(name); |
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341 | |||
342 | hash_table_insert(table->ht, hdr, hdr->name); |
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343 | hdr->next = table->hdr; |
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344 | table->hdr = hdr; |
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345 | } |
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346 | |||
347 | check_symbol_table(table); |
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348 | |||
349 | /* If the symbol already exists in this namespace at this scope, it cannot |
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350 | * be added to the table. |
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351 | */ |
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352 | for (sym = hdr->symbols |
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353 | ; (sym != NULL) && (sym->name_space != name_space) |
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354 | ; sym = sym->next_with_same_name) { |
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355 | /* empty */ |
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356 | } |
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357 | |||
358 | if (sym && (sym->depth == table->depth)) |
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359 | return -1; |
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360 | |||
361 | sym = calloc(1, sizeof(*sym)); |
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362 | sym->next_with_same_name = hdr->symbols; |
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363 | sym->next_with_same_scope = table->current_scope->symbols; |
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364 | sym->hdr = hdr; |
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365 | sym->name_space = name_space; |
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366 | sym->data = declaration; |
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367 | sym->depth = table->depth; |
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368 | |||
369 | assert(sym->hdr == hdr); |
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370 | |||
371 | hdr->symbols = sym; |
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372 | table->current_scope->symbols = sym; |
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373 | |||
374 | check_symbol_table(table); |
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375 | return 0; |
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376 | } |
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377 | |||
378 | |||
379 | int |
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380 | _mesa_symbol_table_add_global_symbol(struct _mesa_symbol_table *table, |
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381 | int name_space, const char *name, |
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382 | void *declaration) |
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383 | { |
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384 | struct symbol_header *hdr; |
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385 | struct symbol *sym; |
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386 | struct symbol *curr; |
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387 | struct scope_level *top_scope; |
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388 | |||
389 | check_symbol_table(table); |
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390 | |||
391 | hdr = find_symbol(table, name); |
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392 | |||
393 | check_symbol_table(table); |
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394 | |||
395 | if (hdr == NULL) { |
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396 | hdr = calloc(1, sizeof(*hdr)); |
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397 | hdr->name = strdup(name); |
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398 | |||
399 | hash_table_insert(table->ht, hdr, hdr->name); |
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400 | hdr->next = table->hdr; |
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401 | table->hdr = hdr; |
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402 | } |
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403 | |||
404 | check_symbol_table(table); |
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405 | |||
406 | /* If the symbol already exists in this namespace at this scope, it cannot |
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407 | * be added to the table. |
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408 | */ |
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409 | for (sym = hdr->symbols |
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410 | ; (sym != NULL) && (sym->name_space != name_space) |
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411 | ; sym = sym->next_with_same_name) { |
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412 | /* empty */ |
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413 | } |
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414 | |||
415 | if (sym && sym->depth == 0) |
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416 | return -1; |
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417 | |||
418 | /* Find the top-level scope */ |
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419 | for (top_scope = table->current_scope |
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420 | ; top_scope->next != NULL |
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421 | ; top_scope = top_scope->next) { |
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422 | /* empty */ |
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423 | } |
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424 | |||
425 | sym = calloc(1, sizeof(*sym)); |
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426 | sym->next_with_same_scope = top_scope->symbols; |
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427 | sym->hdr = hdr; |
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428 | sym->name_space = name_space; |
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429 | sym->data = declaration; |
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430 | |||
431 | assert(sym->hdr == hdr); |
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432 | |||
433 | /* Since next_with_same_name is ordered by scope, we need to append the |
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434 | * new symbol to the _end_ of the list. |
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435 | */ |
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436 | if (hdr->symbols == NULL) { |
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437 | hdr->symbols = sym; |
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438 | } else { |
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439 | for (curr = hdr->symbols |
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440 | ; curr->next_with_same_name != NULL |
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441 | ; curr = curr->next_with_same_name) { |
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442 | /* empty */ |
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443 | } |
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444 | curr->next_with_same_name = sym; |
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445 | } |
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446 | top_scope->symbols = sym; |
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447 | |||
448 | check_symbol_table(table); |
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449 | return 0; |
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450 | } |
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451 | |||
452 | |||
453 | |||
454 | struct _mesa_symbol_table * |
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455 | _mesa_symbol_table_ctor(void) |
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456 | { |
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457 | struct _mesa_symbol_table *table = calloc(1, sizeof(*table)); |
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458 | |||
459 | if (table != NULL) { |
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460 | table->ht = hash_table_ctor(32, hash_table_string_hash, |
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461 | hash_table_string_compare); |
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462 | |||
463 | _mesa_symbol_table_push_scope(table); |
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464 | } |
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465 | |||
466 | return table; |
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467 | } |
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468 | |||
469 | |||
470 | void |
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471 | _mesa_symbol_table_dtor(struct _mesa_symbol_table *table) |
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472 | { |
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473 | struct symbol_header *hdr; |
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474 | struct symbol_header *next; |
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475 | |||
476 | while (table->current_scope != NULL) { |
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477 | _mesa_symbol_table_pop_scope(table); |
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478 | } |
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479 | |||
480 | for (hdr = table->hdr; hdr != NULL; hdr = next) { |
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481 | next = hdr->next; |
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482 | free(hdr->name); |
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483 | free(hdr); |
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484 | } |
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485 | |||
486 | hash_table_dtor(table->ht); |
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487 | free(table); |
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488 | }=> |