Mercurial > hg-old > index.cgi
annotate lwasm/symbol.c @ 426:652eee8f0c82
Fixed lw_expr_destroy() to not crash on NULL
| author | lost@l-w.ca |
|---|---|
| date | Sun, 19 Sep 2010 10:40:37 -0600 |
| parents | cac204676434 |
| children |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 2 symbol.c | |
| 3 | |
| 4 Copyright © 2010 William Astle | |
| 5 | |
| 6 This file is part of LWTOOLS. | |
| 7 | |
| 8 LWTOOLS is free software: you can redistribute it and/or modify it under the | |
| 9 terms of the GNU General Public License as published by the Free Software | |
| 10 Foundation, either version 3 of the License, or (at your option) any later | |
| 11 version. | |
| 12 | |
| 13 This program is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 16 more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License along with | |
| 19 this program. If not, see <http://www.gnu.org/licenses/>. | |
| 20 */ | |
| 21 | |
| 22 #include <config.h> | |
| 23 | |
|
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24 #include <stdio.h> |
| 342 | 25 #include <stdlib.h> |
| 26 #include <string.h> | |
| 27 | |
| 28 #include <lw_alloc.h> | |
| 29 #include <lw_expr.h> | |
| 370 | 30 #include <lw_string.h> |
| 342 | 31 |
| 32 #include "lwasm.h" | |
| 33 | |
| 406 | 34 struct symtabe *symbol_findprev(asmstate_t *as, struct symtabe *se) |
| 35 { | |
| 36 struct symtabe *se1, *se2; | |
| 37 int i; | |
| 38 | |
| 39 for (se2 = NULL, se1 = as -> symtab.head; se1; se1 = se1 -> next) | |
| 40 { | |
| 41 debug_message(as, 200, "Sorting; looking at symbol %s (%p) for %s", se1 -> symbol, se1, se -> symbol); | |
| 42 /* compare se with se1 */ | |
| 43 i = strcasecmp(se -> symbol, se1 -> symbol); | |
| 44 | |
| 45 /* if the symbol sorts before se1, we just need to return */ | |
| 46 if (i < 0) | |
| 47 return se2; | |
| 48 | |
| 49 if (i == 0) | |
| 50 { | |
| 51 /* symbol name matches; compare other things */ | |
| 52 | |
| 53 /*if next version is greater than this one, return */ | |
| 54 if (se -> version > se1 -> version) | |
| 55 return se2; | |
| 56 /* if next context is great than this one, return */ | |
| 57 if (se -> context > se1 -> context) | |
| 58 return se2; | |
| 59 | |
| 60 /* if section name is greater, return */ | |
| 61 /* if se has no section but se1 does, we go first */ | |
| 62 if (se -> section == NULL && se1 -> section != NULL) | |
| 63 return se2; | |
| 64 if (se -> section != NULL && se -> section != NULL) | |
| 65 { | |
| 66 /* compare section names and if se < se1, return */ | |
| 67 i = strcasecmp(se -> section -> name, se1 -> section -> name); | |
| 68 if (i < 0) | |
| 69 return se2; | |
| 70 } | |
| 71 } | |
| 72 | |
| 73 se2 = se1; | |
| 74 } | |
| 75 return se2; | |
| 76 } | |
| 77 | |
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78 struct symtabe *register_symbol(asmstate_t *as, line_t *cl, char *sym, lw_expr_t val, int flags) |
| 342 | 79 { |
| 80 struct symtabe *se; | |
| 406 | 81 struct symtabe *sprev; |
| 342 | 82 int islocal = 0; |
| 83 int context = -1; | |
| 84 int version = -1; | |
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85 char *cp; |
| 342 | 86 |
| 406 | 87 debug_message(as, 200, "Register symbol %s (%02X), %s", sym, flags, lw_expr_print(val)); |
| 88 | |
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89 if (!(flags & symbol_flag_nocheck)) |
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90 { |
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91 if (!sym || !*sym) |
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92 { |
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93 lwasm_register_error(as, cl, "Bad symbol (%s)", sym); |
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94 return NULL; |
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95 } |
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96 if (*sym < 0x80 && (!strchr(SSYMCHARS, *sym) && !strchr(sym + 1, '$') && !strchr(sym + 1, '@') && !strchr(sym + 1, '?'))) |
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97 { |
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98 lwasm_register_error(as, cl, "Bad symbol (%s)", sym); |
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99 return NULL; |
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100 } |
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101 |
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102 if ((*sym == '$' || *sym == '@') && (sym[1] >= '0' && sym[1] <= '9')) |
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103 { |
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104 lwasm_register_error(as, cl, "Bad symbol (%s)", sym); |
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105 return NULL; |
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106 } |
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107 } |
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108 |
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109 for (cp = sym; *cp; cp++) |
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110 { |
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111 if (*cp == '@' || *cp == '?') |
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112 islocal = 1; |
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113 if (*cp == '$' && !(CURPRAGMA(cl, PRAGMA_DOLLARNOTLOCAL))) |
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114 islocal = 1; |
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115 |
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116 // bad symbol |
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117 if (!(flags & symbol_flag_nocheck) && *cp < 0x80 && !strchr(SYMCHARS, *cp)) |
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118 { |
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119 lwasm_register_error(as, cl, "Bad symbol (%s)", sym); |
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120 return NULL; |
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121 } |
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122 } |
| 342 | 123 |
| 124 if (islocal) | |
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125 context = cl -> context; |
| 342 | 126 |
| 127 // first, look up symbol to see if it is already defined | |
| 128 for (se = as -> symtab.head; se; se = se -> next) | |
| 129 { | |
| 406 | 130 debug_message(as, 300, "Symbol add lookup: %p, %p", se, se -> next); |
| 342 | 131 if (!strcmp(sym, se -> symbol)) |
| 132 { | |
| 133 if (se -> context != context) | |
| 134 continue; | |
| 135 if ((flags & symbol_flag_set) && (se -> flags & symbol_flag_set)) | |
| 136 { | |
| 137 if (version < se -> version) | |
| 138 version = se -> version; | |
| 139 continue; | |
| 140 } | |
| 141 break; | |
| 142 } | |
| 143 } | |
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144 |
| 342 | 145 if (se) |
| 146 { | |
| 147 // multiply defined symbol | |
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148 lwasm_register_error(as, cl, "Multiply defined symbol (%s)", sym); |
| 342 | 149 return NULL; |
| 150 } | |
| 151 | |
| 152 if (flags & symbol_flag_set) | |
| 153 { | |
| 154 version++; | |
| 155 } | |
| 156 | |
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157 // symplify the symbol expression - replaces "SET" symbols with |
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158 // symbol table entries |
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159 lwasm_reduce_expr(as, val); |
| 406 | 160 |
| 342 | 161 se = lw_alloc(sizeof(struct symtabe)); |
| 162 se -> context = context; | |
| 163 se -> version = version; | |
| 164 se -> flags = flags; | |
| 165 se -> value = lw_expr_copy(val); | |
| 370 | 166 se -> symbol = lw_strdup(sym); |
| 374 | 167 se -> section = cl -> csect; |
| 406 | 168 sprev = symbol_findprev(as, se); |
| 169 if (!sprev) | |
| 170 { | |
| 171 debug_message(as, 200, "Adding symbol at head of symbol table"); | |
| 172 se -> next = as -> symtab.head; | |
| 173 as -> symtab.head = se; | |
| 174 } | |
| 175 else | |
| 176 { | |
| 177 debug_message(as, 200, "Adding symbol in middle of symbol table"); | |
| 178 se -> next = sprev -> next; | |
| 179 sprev -> next = se; | |
| 180 } | |
| 342 | 181 return se; |
| 182 } | |
| 183 | |
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184 // for "SET" symbols, always returns the LAST definition of the |
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185 // symbol. This works because the lwasm_reduce_expr() call in |
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186 // register_symbol will ensure there are no lingering "var" references |
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187 // to the set symbol anywhere in the symbol table; they will all be |
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188 // converted to direct references |
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189 // NOTE: this means that for a forward reference to a SET symbol, |
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190 // the LAST definition will be the one used. |
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191 // This arrangement also ensures that any reference to the symbol |
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192 // itself inside a "set" definition will refer to the previous version |
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193 // of the symbol. |
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194 struct symtabe * lookup_symbol(asmstate_t *as, line_t *cl, char *sym) |
| 342 | 195 { |
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196 int local = 0; |
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197 struct symtabe *s, *s2; |
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198 |
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199 // check if this is a local symbol |
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200 if (strchr(sym, '@') || strchr(sym, '?')) |
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201 local = 1; |
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202 |
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203 if (cl && !CURPRAGMA(cl, PRAGMA_DOLLARNOTLOCAL) && strchr(sym, '$')) |
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204 local = 1; |
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205 if (!cl && !(as -> pragmas & PRAGMA_DOLLARNOTLOCAL) && strchr(sym, '$')) |
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206 local = 1; |
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207 |
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208 // cannot look up local symbol in global context!!!!! |
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209 if (!cl && local) |
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210 return NULL; |
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211 |
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212 for (s = as -> symtab.head, s2 = NULL; s; s = s -> next) |
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213 { |
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214 if (!strcmp(sym, s -> symbol)) |
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215 { |
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216 if (local && s -> context != cl -> context) |
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217 continue; |
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218 |
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219 if (s -> flags & symbol_flag_set) |
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220 { |
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221 // look for highest version of symbol |
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222 if (s -> version > s2 -> version) |
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223 s2 = s; |
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224 continue; |
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225 } |
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226 break; |
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227 } |
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228 } |
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229 if (!s && s2) |
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230 s = s2; |
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231 |
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232 return s; |
| 342 | 233 } |
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234 |
| 405 | 235 struct listinfo |
| 236 { | |
| 237 sectiontab_t *sect; | |
| 238 asmstate_t *as; | |
| 239 int complex; | |
| 240 }; | |
| 241 | |
| 242 int list_symbols_test(lw_expr_t e, void *p) | |
| 243 { | |
| 244 struct listinfo *li = p; | |
| 245 | |
| 246 if (li -> complex) | |
| 247 return 0; | |
| 248 | |
| 249 if (lw_expr_istype(e, lw_expr_type_special)) | |
| 250 { | |
| 251 if (lw_expr_specint(e) == lwasm_expr_secbase) | |
| 252 { | |
| 253 if (li -> sect) | |
| 254 { | |
| 255 li -> complex = 1; | |
| 256 } | |
| 257 else | |
| 258 { | |
| 259 li -> sect = lw_expr_specptr(e); | |
| 260 } | |
| 261 } | |
| 262 } | |
| 263 return 0; | |
| 264 } | |
| 265 | |
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266 void list_symbols(asmstate_t *as, FILE *of) |
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267 { |
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268 struct symtabe *s; |
| 405 | 269 lw_expr_t te; |
| 270 struct listinfo li; | |
| 271 | |
| 272 li.as = as; | |
| 273 | |
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274 fprintf(of, "\nSymbol Table:\n"); |
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275 |
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276 for (s = as -> symtab.head; s; s = s -> next) |
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277 { |
| 405 | 278 lwasm_reduce_expr(as, s -> value); |
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279 fputc('[', of); |
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280 if (s -> flags & symbol_flag_set) |
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281 fputc('S', of); |
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282 else |
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283 fputc(' ', of); |
| 405 | 284 if (as -> output_format == OUTPUT_OBJ) |
| 285 { | |
| 286 if (lw_expr_istype(s -> value, lw_expr_type_int)) | |
| 287 fputc('c', of); | |
| 288 else | |
| 289 fputc('s', of); | |
| 290 } | |
| 291 if (s -> context < 0) | |
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292 fputc('G', of); |
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293 else |
| 405 | 294 fputc('L', of); |
| 295 | |
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296 fputc(']', of); |
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297 fputc(' ', of); |
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298 fprintf(of, "%-32s ", s -> symbol); |
| 405 | 299 |
| 300 te = lw_expr_copy(s -> value); | |
| 301 li.complex = 0; | |
| 302 li.sect = NULL; | |
| 303 lw_expr_testterms(te, list_symbols_test, &li); | |
| 304 if (li.sect) | |
| 305 { | |
| 306 as -> exportcheck = 1; | |
| 307 as -> csect = li.sect; | |
| 308 lwasm_reduce_expr(as, te); | |
| 309 as -> exportcheck = 0; | |
| 310 } | |
| 311 | |
| 312 if (lw_expr_istype(te, lw_expr_type_int)) | |
| 313 { | |
| 314 fprintf(of, "%04X", lw_expr_intval(te)); | |
| 315 if (li.sect) | |
| 316 { | |
| 317 fprintf(of, " (%s)", li.sect -> name); | |
| 318 } | |
| 319 fprintf(of, "\n"); | |
| 320 } | |
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321 else |
| 405 | 322 { |
| 323 fprintf(of, "<<incomplete>>\n"); | |
| 324 // fprintf(of, "%s\n", lw_expr_print(s -> value)); | |
| 325 } | |
| 326 lw_expr_destroy(te); | |
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327 } |
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328 } |