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annotate src/symbol.c @ 37:538e15927776

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Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
author lost
date Sat, 03 Jan 2009 04:20:49 +0000
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children d2cee0c335e7
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37
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
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1 /*
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2 symbol.c
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3 Copyright © 2009 William Astle
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4
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5 This file is part of LWASM.
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6
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7 LWASM is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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11
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
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15 more details.
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16
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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19 */
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20
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21 /*
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22 for handling the symbol table
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23 */
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24
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25 #define __symbol_c_seen__
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26
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27 #include <string.h>
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28
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29 #include "lwasm.h"
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30 #include "util.h"
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31
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32 int lwasm_register_symbol(asmstate_t *as, lwasm_line_t *l, char *sym, int val)
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33 {
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34 lwasm_symbol_ent_t *se, *se2;
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35 char *p;
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36
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37 int scontext = -1;
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38
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39 // first check if the symbol is valid
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40 // the following characters are allowed in a symbol:
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41 // [a-zA-Z0-9._$?@] and any byte value larger than 0x7F
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42 // although symbols should be restricted to the 7 bit range
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43 // symbols must start with [a-zA-Z._]
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44 if (!strchr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz._@?", *sym))
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45 {
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46 register_error(as, l, 1, "Bad symbol: %s", sym);
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47 return -1;
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48 }
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49
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50 for (p = sym; *p; p++)
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51 {
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52 if (!strchr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz._$?@0123456789", *sym) && (unsigned char)*sym < 0x80)
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53 {
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54 register_error(as, l, 1, "Bad symbol: %s", sym);
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55 return -1;
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56 }
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57 // flag local symbols while we're at it...
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58 if (*p == '?' || *p == '@')
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59 scontext = as -> context;
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60 }
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61
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62 // now look it for to see if it is a duplicate
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63 se = lwasm_find_symbol(as, sym, scontext);
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64 if (se)
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65 {
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66 register_error(as, l, 1, "Mulitply defined symbol: %s", sym);
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67 return -1;
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68 }
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69
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70 // if not a duplicate, register it with the value
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71 se = lwasm_alloc(sizeof(lwasm_symbol_ent_t));
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72 if (as -> symhead)
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73 {
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74 se -> prev = NULL;
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75 se -> next = as -> symhead;
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76 as -> symhead -> prev = se;
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77 as -> symhead = se;
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78 }
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79 else
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80 {
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81 se -> next = NULL;
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82 se -> prev = NULL;
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83 as -> symhead = se;
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84 as -> symtail = se;
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85 }
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86 se -> value = val;
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87 se -> sym = lwasm_strdup(sym);
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88 se -> context = scontext;
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89
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90 return 0;
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91 }
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92
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93 lwasm_symbol_ent_t *lwasm_find_symbol(asmstate_t *as, char *sym, int scontext)
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94 {
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95 lwasm_symbol_ent_t *se;
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96
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97 for (se = as -> symhead; se; se = se -> next)
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98 {
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99 if (scontext == se -> context && !strcmp(sym, se -> sym))
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100 {
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101 return se;
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102 }
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103 }
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104 return NULL;
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105 }
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106
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107 // reset the value of a symbol - should not be used normally
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108 // it is intended for use by such operations as EQU
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109 // returns -1 if the symbol is not registered
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110 int lwasm_set_symbol(asmstate_t *as, char *sym, int scontext, int val)
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111 {
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112 lwasm_symbol_ent_t *se;
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113
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114 se = lwasm_find_symbol(as, sym, scontext);
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115 if (!se)
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116 return -1;
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117
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118 se -> value = val;
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119 return 0;
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120 }