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296
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1 /*
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2 lwcc/symbol.c
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3
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4 Copyright © 2013 William Astle
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5
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6 This file is part of LWTOOLS.
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7
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8 LWTOOLS is free software: you can redistribute it and/or modify it under the
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9 terms of the GNU General Public License as published by the Free Software
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10 Foundation, either version 3 of the License, or (at your option) any later
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11 version.
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12
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13 This program is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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16 more details.
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17
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18 You should have received a copy of the GNU General Public License along with
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19 this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #include <string.h>
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23
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24 #include <lw_alloc.h>
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25 #include <lw_string.h>
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26
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27 #include "cpp.h"
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28 #include "symbol.h"
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29 #include "token.h"
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30
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31 void symbol_free(struct symtab_e *s)
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32 {
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33 int i;
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34 struct token *t;
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35
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36 lw_free(s -> name);
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37
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38 for (i = 0; i < s -> nargs; i++)
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39 lw_free(s -> params[i]);
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40 lw_free(s -> params);
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41 while (s -> tl)
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42 {
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43 t = s -> tl;
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44 s -> tl = t -> next;
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45 token_free(t);
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46 }
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47 }
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48
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49 struct symtab_e *symtab_find(struct preproc_info *pp, char *name)
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50 {
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51 struct symtab_e *s;
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52
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53 for (s = pp -> sh; s; s = s -> next)
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54 {
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55 if (strcmp(s -> name, name) == 0)
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56 {
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57 return s;
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58 }
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59 }
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60 return NULL;
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61 }
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62
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63 void symtab_undef(struct preproc_info *pp, char *name)
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64 {
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65 struct symtab_e *s, **p;
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66
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67 p = &(pp -> sh);
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68 for (s = pp -> sh; s; s = s -> next)
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69 {
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70 if (strcmp(s -> name, name) == 0)
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71 {
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72 (*p) -> next = s -> next;
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73 symbol_free(s);
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74 return;
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75 }
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76 p = &((*p) -> next);
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77 }
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78 }
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79
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80 void symtab_define(struct preproc_info *pp, char *name, struct token *def, int nargs, char **params, int vargs)
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81 {
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82 struct symtab_e *s;
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83
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84 s = lw_alloc(sizeof(struct symtab_e));
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85 s -> name = lw_strdup(name);
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86 s -> tl = def;
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87 s -> nargs = nargs;
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88 s -> params = params;
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89 s -> vargs = vargs;
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90 s -> next = pp -> sh;
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91 pp -> sh = s;
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92 }
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