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1 /*
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2 symbol.c
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3
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4 Copyright © 2010 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 <config.h>
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23
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24 #include <stdlib.h>
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25 #include <string.h>
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26
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27 #include <lw_alloc.h>
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28 #include <lw_expr.h>
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29
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30 #include "lwasm.h"
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31
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32 struct symtabe *register_symbol(asmstate_t *as, char *sym, lw_expr_t val, int flags)
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33 {
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34 struct symtabe *se;
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35 int islocal = 0;
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36 int context = -1;
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37 int version = -1;
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38
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39 if (strchr(sym, '@') || strchr(sym, '?'))
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40 islocal = 1;
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41 if (!(as -> pragmas & PRAGMA_DOLLARNOTLOCAL) && strchr(sym, '$'))
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42 islocal = 1;
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43
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44 if (islocal)
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45 context = as -> context;
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46
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47 // first, look up symbol to see if it is already defined
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48 for (se = as -> symtab.head; se; se = se -> next)
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49 {
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50 if (!strcmp(sym, se -> symbol))
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51 {
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52 if (se -> context != context)
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53 continue;
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54 if ((flags & symbol_flag_set) && (se -> flags & symbol_flag_set))
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55 {
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56 if (version < se -> version)
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57 version = se -> version;
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58 continue;
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59 }
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60 break;
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61 }
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62 }
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63 if (se)
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64 {
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65 // multiply defined symbol
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66 return NULL;
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67 }
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68
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69 if (flags & symbol_flag_set)
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70 {
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71 version++;
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72 }
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73
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74 se = lw_alloc(sizeof(struct symtabe));
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75 se -> next = as -> symtab.head;
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76 as -> symtab.head = se;
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77 se -> context = context;
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78 se -> version = version;
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79 se -> flags = flags;
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80 se -> value = lw_expr_copy(val);
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81 return se;
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82 }
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83
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84 struct symtabe * lookup_symbol(asmstate_t *as, char *sym, int context, int version)
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85 {
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86 return NULL;
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87 }
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