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annotate src/symbol.c @ 59:89657cb3fdf8

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Moved insn_rel.c to simplified expression evaluation
author lost
date Mon, 05 Jan 2009 00:40:58 +0000
parents b1d81800bc91
children d85ba47b1e8f
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37
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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
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15 more details.
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16
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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
40
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32 /*
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33 Note that this function may accept symbols that the expression evaluator doesn't
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34 recognize because the expression evaluator must avoid all ambiguity in order
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35 to achieve predictable results. The checks here are simply a fuzz check.
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36 */
37
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37 int lwasm_register_symbol(asmstate_t *as, lwasm_line_t *l, char *sym, int val)
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38 {
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39 lwasm_symbol_ent_t *se, *se2;
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40 char *p;
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41
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42 int scontext = -1;
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43
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44 // first check if the symbol is valid
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45 // the following characters are allowed in a symbol:
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46 // [a-zA-Z0-9._$?@] and any byte value larger than 0x7F
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47 // although symbols should be restricted to the 7 bit range
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48 // symbols must start with [a-zA-Z._]
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49 if (!strchr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz._@?", *sym))
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50 {
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51 register_error(as, l, 1, "Bad symbol: %s", sym);
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52 return -1;
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53 }
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54
40
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55 if (*sym == '@' && isdigit(sym[1]))
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56 {
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57 register_error(as, l, 1, "Bad symbol: %s", sym);
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58 return -1;
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59 }
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60
37
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61 for (p = sym; *p; p++)
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62 {
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63 if (!strchr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz._$?@0123456789", *sym))
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64 {
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65 register_error(as, l, 1, "Bad symbol: %s", sym);
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66 return -1;
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67 }
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68 // flag local symbols while we're at it...
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69 if (*p == '?' || *p == '@')
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70 scontext = as -> context;
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71 }
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72
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73 debug_message(3, "lwasm_register_symbol(): registering '%s' (%d) at %04X", sym, scontext, val);
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74
37
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75 // now look it for to see if it is a duplicate
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76 se = lwasm_find_symbol(as, sym, scontext);
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77 if (se)
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78 {
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79 register_error(as, l, 1, "Mulitply defined symbol: %s", sym);
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80 return -1;
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81 }
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82
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83 // if not a duplicate, register it with the value
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84 se = lwasm_alloc(sizeof(lwasm_symbol_ent_t));
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85 if (as -> symhead)
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86 {
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87 se -> prev = NULL;
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88 se -> next = as -> symhead;
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89 as -> symhead -> prev = se;
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90 as -> symhead = se;
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91 }
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92 else
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93 {
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94 se -> next = NULL;
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95 se -> prev = NULL;
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96 as -> symhead = se;
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97 as -> symtail = se;
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98 }
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99 se -> value = val;
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100 se -> sym = lwasm_strdup(sym);
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101 se -> context = scontext;
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102
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103 return 0;
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104 }
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105
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106 lwasm_symbol_ent_t *lwasm_find_symbol(asmstate_t *as, char *sym, int scontext)
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107 {
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108 lwasm_symbol_ent_t *se;
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109
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110 for (se = as -> symhead; se; se = se -> next)
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111 {
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112 if (scontext == se -> context && !strcmp(sym, se -> sym))
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113 {
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114 return se;
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115 }
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116 }
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117 return NULL;
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118 }
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119
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120 // reset the value of a symbol - should not be used normally
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121 // it is intended for use by such operations as EQU
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122 // returns -1 if the symbol is not registered
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123 int lwasm_set_symbol(asmstate_t *as, char *sym, int scontext, int val)
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124 {
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125 lwasm_symbol_ent_t *se;
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126
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127 se = lwasm_find_symbol(as, sym, scontext);
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128 if (!se)
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129 return -1;
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130
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131 se -> value = val;
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132 return 0;
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133 }
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134
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135 void lwasm_list_symbols(asmstate_t *as, FILE *lf)
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136 {
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137 lwasm_symbol_ent_t *se;
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138
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139 for (se = as -> symhead; se; se = se -> next)
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140 {
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141 if (se -> value > 0xffff || se -> value < -0x8000)
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142 {
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143 fprintf(lf, "%08X ", se -> value);
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144 }
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145 else
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146 {
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147 fprintf(lf, " %04X ", se -> value);
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148 }
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149 if (se -> context < 0)
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150 fputc('G', lf);
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151 else
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152 fputc('L', lf);
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153
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154 fprintf(lf, " %s", se -> sym);
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155
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156 if (se -> context >= 0)
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157 fprintf(lf, " (%d)", se -> context);
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158
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159 fputc('\n', lf);
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160 }
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161 }