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annotate lwasm/symbol.c @ 397:09fe7c40a082 3.0-beta1

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Branched for 3.0-beta1 release
author lost@l-w.ca
date Fri, 23 Jul 2010 17:12:47 -0600
parents 027d7fbcdcfc
children 7bcc50e828ff
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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 <stdio.h>
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25 #include <stdlib.h>
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26 #include <string.h>
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27
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28 #include <lw_alloc.h>
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29 #include <lw_expr.h>
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30 #include <lw_string.h>
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31
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32 #include "lwasm.h"
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33
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34 struct symtabe *register_symbol(asmstate_t *as, line_t *cl, char *sym, lw_expr_t val, int flags)
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35 {
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36 struct symtabe *se;
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37 int islocal = 0;
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38 int context = -1;
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39 int version = -1;
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40 char *cp;
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41
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42 if (!(flags & symbol_flag_nocheck))
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43 {
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44 if (*sym < 0x80 && !strchr(SSYMCHARS, *sym))
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45 {
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46 lwasm_register_error(as, cl, "Bad symbol (%s)", sym);
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47 return NULL;
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48 }
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49
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50 if ((*sym == '$' || *sym == '@') && (sym[1] >= '0' && sym[1] <= '9'))
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51 {
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52 lwasm_register_error(as, cl, "Bad symbol (%s)", sym);
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53 return NULL;
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54 }
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55 }
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56
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57 for (cp = sym; *cp; cp++)
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58 {
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59 if (*cp == '@' || *cp == '?')
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60 islocal = 1;
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61 if (*cp == '$' && !(CURPRAGMA(cl, PRAGMA_DOLLARNOTLOCAL)))
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62 islocal = 1;
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63
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64 // bad symbol
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65 if (!(flags & symbol_flag_nocheck) && *cp < 0x80 && !strchr(SYMCHARS, *cp))
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66 {
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67 lwasm_register_error(as, cl, "Bad symbol (%s)", sym);
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68 return NULL;
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69 }
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70 }
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71
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72 if (islocal)
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73 context = cl -> context;
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74
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75 // first, look up symbol to see if it is already defined
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76 for (se = as -> symtab.head; se; se = se -> next)
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77 {
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78 if (!strcmp(sym, se -> symbol))
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79 {
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80 if (se -> context != context)
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81 continue;
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82 if ((flags & symbol_flag_set) && (se -> flags & symbol_flag_set))
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83 {
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84 if (version < se -> version)
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85 version = se -> version;
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86 continue;
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87 }
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88 break;
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89 }
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90 }
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91
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92 if (se)
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93 {
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94 // multiply defined symbol
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95 lwasm_register_error(as, cl, "Multiply defined symbol (%s)", sym);
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96 return NULL;
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97 }
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98
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99 if (flags & symbol_flag_set)
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100 {
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101 version++;
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102 }
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103
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104 // symplify the symbol expression - replaces "SET" symbols with
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105 // symbol table entries
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106 lwasm_reduce_expr(as, val);
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107
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108 se = lw_alloc(sizeof(struct symtabe));
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109 se -> next = as -> symtab.head;
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110 as -> symtab.head = se;
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111 se -> context = context;
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112 se -> version = version;
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113 se -> flags = flags;
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114 se -> value = lw_expr_copy(val);
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115 se -> symbol = lw_strdup(sym);
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116 se -> section = cl -> csect;
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117 return se;
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118 }
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119
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120 // for "SET" symbols, always returns the LAST definition of the
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121 // symbol. This works because the lwasm_reduce_expr() call in
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122 // register_symbol will ensure there are no lingering "var" references
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123 // to the set symbol anywhere in the symbol table; they will all be
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124 // converted to direct references
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125 // NOTE: this means that for a forward reference to a SET symbol,
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126 // the LAST definition will be the one used.
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127 // This arrangement also ensures that any reference to the symbol
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128 // itself inside a "set" definition will refer to the previous version
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129 // of the symbol.
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130 struct symtabe * lookup_symbol(asmstate_t *as, line_t *cl, char *sym)
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131 {
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132 int local = 0;
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133 struct symtabe *s, *s2;
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134
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135 // check if this is a local symbol
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136 if (strchr(sym, '@') || strchr(sym, '?'))
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137 local = 1;
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138
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139 if (cl && !CURPRAGMA(cl, PRAGMA_DOLLARNOTLOCAL) && strchr(sym, '$'))
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140 local = 1;
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141 if (!cl && !(as -> pragmas & PRAGMA_DOLLARNOTLOCAL) && strchr(sym, '$'))
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142 local = 1;
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143
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144 // cannot look up local symbol in global context!!!!!
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145 if (!cl && local)
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146 return NULL;
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147
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148 for (s = as -> symtab.head, s2 = NULL; s; s = s -> next)
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149 {
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150 if (!strcmp(sym, s -> symbol))
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151 {
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152 if (local && s -> context != cl -> context)
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153 continue;
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154
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155 if (s -> flags & symbol_flag_set)
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156 {
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157 // look for highest version of symbol
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158 if (s -> version > s2 -> version)
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159 s2 = s;
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160 continue;
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161 }
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162 break;
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163 }
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164 }
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165 if (!s && s2)
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166 s = s2;
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167
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168 return s;
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169 }
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170
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171 void list_symbols(asmstate_t *as, FILE *of)
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172 {
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173 struct symtabe *s;
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174
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175 fprintf(of, "\nSymbol Table:\n");
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176
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177 for (s = as -> symtab.head; s; s = s -> next)
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178 {
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179 fputc('[', of);
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180 if (s -> flags & symbol_flag_set)
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181 fputc('S', of);
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182 else
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183 fputc(' ', of);
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184 if (lw_expr_istype(s -> value, lw_expr_type_int))
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185 fputc('G', of);
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186 else
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187 fputc(' ', of);
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188 fputc(']', of);
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189 fputc(' ', of);
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190 fprintf(of, "%-32s ", s -> symbol);
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191 if (lw_expr_istype(s -> value, lw_expr_type_int))
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192 fprintf(of, "%04X\n", lw_expr_intval(s -> value));
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193 else
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194 fprintf(of, "%s\n", lw_expr_print(s -> value));
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195 }
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196 }