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annotate lwasm/section.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 | 35a0b086bf4a |
| children |
| rev | line source |
|---|---|
| 353 | 1 /* |
| 2 section.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 | |
| 24 #include <string.h> | |
| 25 | |
| 26 #include <lw_string.h> | |
| 27 #include <lw_alloc.h> | |
| 28 | |
| 29 #include "lwasm.h" | |
| 30 #include "instab.h" | |
| 31 | |
| 32 PARSEFUNC(pseudo_parse_section) | |
| 33 { | |
| 34 char *p2; | |
| 35 char *sn; | |
| 36 char *opts = NULL; | |
| 37 sectiontab_t *s; | |
| 38 | |
| 39 if (as -> output_format != OUTPUT_OBJ) | |
| 40 { | |
| 41 lwasm_register_error(as, l, "Cannot use sections unless using the object target"); | |
| 42 return; | |
| 43 } | |
| 44 | |
| 45 if (!**p) | |
| 46 { | |
| 47 lwasm_register_error(as, l, "Need section name"); | |
| 48 return; | |
| 49 } | |
| 50 | |
|
387
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
385
diff
changeset
|
51 l -> len = 0; |
|
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
385
diff
changeset
|
52 |
| 353 | 53 if (as -> csect) |
| 54 { | |
| 55 lw_expr_destroy(as -> csect -> offset); | |
|
412
35a0b086bf4a
Added dummy .bank pseudo and fixed segfault in output for object target (on imported symbol)
lost@l-w.ca
parents:
387
diff
changeset
|
56 as -> csect -> offset = lw_expr_copy(l -> addr); |
| 353 | 57 as -> csect = NULL; |
| 58 } | |
| 59 | |
| 60 for (p2 = *p; *p2 && *p2 != ',' && !isspace(*p2); p2++) | |
| 61 /* do nothing */ ; | |
| 62 | |
| 63 sn = lw_strndup(*p, p2 - *p); | |
| 64 *p = p2; | |
| 65 | |
| 66 if (**p == ',') | |
| 67 { | |
| 68 // have opts | |
| 69 (*p)++; | |
| 70 | |
| 71 for (p2 = *p; *p2 && !isspace(*p2); p2++) | |
| 72 /* do nothing */ ; | |
| 73 | |
| 74 opts = lw_strndup(*p, p2 - *p); | |
| 75 *p = p2; | |
| 76 } | |
| 77 | |
| 78 for (s = as -> sections; s; s = s -> next) | |
| 79 { | |
| 80 if (!strcmp(s -> name, sn)) | |
| 81 break; | |
| 82 } | |
| 83 if (s && opts) | |
| 84 { | |
| 85 lwasm_register_warning(as, l, "Section flags can only be specified the first time; ignoring duplicate definition"); | |
| 86 } | |
| 87 if (!s) | |
| 88 { | |
| 89 // create section data structure | |
| 90 s = lw_alloc(sizeof(sectiontab_t)); | |
|
387
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
385
diff
changeset
|
91 s -> oblen = 0; |
|
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
385
diff
changeset
|
92 s -> obsize = 0; |
|
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
385
diff
changeset
|
93 s -> obytes = NULL; |
| 353 | 94 s -> name = lw_strdup(sn); |
| 367 | 95 s -> offset = lw_expr_build(lw_expr_type_special, lwasm_expr_secbase, s); |
| 353 | 96 s -> flags = section_flag_none; |
|
387
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
385
diff
changeset
|
97 s -> reloctab = NULL; |
| 353 | 98 if (!strcasecmp(sn, "bss") || !strcasecmp(sn, ".bss")) |
| 99 { | |
| 100 s -> flags |= section_flag_bss; | |
| 101 } | |
| 102 // parse options | |
| 103 if (opts) | |
| 104 { | |
| 105 // only one option ("bss" or "!bss") | |
| 106 if (!strcasecmp(opts, "bss")) | |
| 107 { | |
| 108 s -> flags |= section_flag_bss; | |
| 109 } | |
| 110 else if (!strcasecmp(opts, "!bss")) | |
| 111 { | |
| 112 s -> flags &= ~section_flag_bss; | |
| 113 } | |
| 114 else | |
| 115 { | |
| 116 lwasm_register_error(as, l, "Unrecognized section flag"); | |
| 117 lw_free(sn); | |
| 118 lw_free(opts); | |
| 119 lw_free(s -> name); | |
| 120 lw_expr_destroy(s -> offset); | |
| 121 lw_free(s); | |
| 122 return; | |
| 123 } | |
| 124 } | |
| 125 s -> next = as -> sections; | |
| 126 as -> sections = s; | |
| 127 } | |
| 128 | |
| 129 lw_expr_destroy(l -> addr); | |
| 130 l -> addr = lw_expr_copy(s -> offset); | |
| 131 | |
| 132 as -> csect = s; | |
| 133 as -> context = lwasm_next_context(as); | |
| 134 | |
| 135 l -> len = 0; | |
| 136 | |
| 137 lw_free(opts); | |
| 138 lw_free(sn); | |
| 139 } | |
| 140 | |
| 141 PARSEFUNC(pseudo_parse_endsection) | |
| 142 { | |
| 143 if (as -> output_format != OUTPUT_OBJ) | |
| 144 { | |
| 145 lwasm_register_error(as, l, "Cannot use sections unless using the object target"); | |
| 146 return; | |
| 147 } | |
| 148 | |
|
387
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
385
diff
changeset
|
149 l -> len = 0; |
|
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
385
diff
changeset
|
150 |
| 353 | 151 if (!(as -> csect)) |
| 152 { | |
| 153 lwasm_register_error(as, l, "ENDSECTION without SECTION"); | |
| 154 return; | |
| 155 } | |
| 156 | |
| 157 // save offset in case another instance of the section appears | |
| 158 lw_expr_destroy(as -> csect -> offset); | |
| 159 as -> csect -> offset = l -> addr; | |
| 160 | |
| 161 // reset address to 0 | |
| 162 l -> addr = lw_expr_build(lw_expr_type_int, 0); | |
| 163 as -> csect = NULL; | |
| 164 | |
| 165 // end of section is a context break | |
| 166 as -> context = lwasm_next_context(as); | |
| 167 | |
| 168 skip_operand(p); | |
| 169 } | |
| 356 | 170 |
| 171 PARSEFUNC(pseudo_parse_export) | |
| 172 { | |
| 173 int after = 0; | |
| 174 char *sym = NULL; | |
| 175 exportlist_t *e; | |
| 176 | |
| 177 if (as -> output_format != OUTPUT_OBJ) | |
| 178 { | |
| 179 lwasm_register_error(as, l, "EXPORT only supported for object target"); | |
| 180 return; | |
| 181 } | |
|
387
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
385
diff
changeset
|
182 |
|
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
385
diff
changeset
|
183 l -> len = 0; |
| 356 | 184 |
| 185 if (l -> sym) | |
| 385 | 186 { |
| 356 | 187 sym = lw_strdup(l -> sym); |
| 385 | 188 l -> symset = 1; |
| 189 } | |
| 356 | 190 |
| 191 if (l -> sym) | |
| 192 { | |
| 193 skip_operand(p); | |
| 194 } | |
| 195 | |
| 196 again: | |
| 197 if (after || !sym) | |
| 198 { | |
| 199 char *p2; | |
| 200 | |
| 201 after = 1; | |
| 202 for (p2 = *p; *p2 && *p2 != ',' && !isspace(*p2); p2++) | |
| 203 /* do nothing */ ; | |
| 204 | |
| 205 sym = lw_strndup(*p, p2 - *p); | |
| 385 | 206 *p = p2; |
| 356 | 207 } |
| 208 if (!sym) | |
| 209 { | |
| 210 lwasm_register_error(as, l, "No symbol for EXPORT"); | |
| 211 return; | |
| 212 } | |
| 213 | |
| 214 // add the symbol to the "export" list (which will be resolved | |
| 215 // after the parse pass is complete | |
| 216 e = lw_alloc(sizeof(exportlist_t)); | |
| 217 e -> next = as -> exportlist; | |
| 218 e -> symbol = lw_strdup(sym); | |
|
363
d96c30e60ddf
Added pass2 and various supporting logic including symbol lookups
lost@starbug
parents:
356
diff
changeset
|
219 e -> line = l; |
| 374 | 220 e -> se = NULL; |
| 356 | 221 as -> exportlist = e; |
| 222 lw_free(sym); | |
| 223 | |
| 224 if (after && **p == ',') | |
| 225 { | |
| 226 (*p)++; | |
| 227 for (; **p && isspace(**p); (*p)++) | |
| 228 /* do nothing */ ; | |
| 229 goto again; | |
| 230 } | |
| 231 } | |
| 232 | |
| 233 PARSEFUNC(pseudo_parse_extern) | |
| 234 { | |
| 235 int after = 0; | |
| 236 char *sym = NULL; | |
| 237 importlist_t *e; | |
| 238 | |
| 239 if (as -> output_format != OUTPUT_OBJ) | |
| 240 { | |
| 241 lwasm_register_error(as, l, "IMPORT only supported for object target"); | |
| 242 return; | |
| 243 } | |
| 244 | |
|
387
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
385
diff
changeset
|
245 l -> len = 0; |
|
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
385
diff
changeset
|
246 |
| 356 | 247 if (l -> sym) |
| 385 | 248 { |
| 356 | 249 sym = lw_strdup(l -> sym); |
| 385 | 250 l -> symset = 1; |
| 251 } | |
| 356 | 252 |
| 253 if (l -> sym) | |
| 254 { | |
| 255 skip_operand(p); | |
| 256 } | |
| 257 | |
| 258 again: | |
| 259 if (after || !sym) | |
| 260 { | |
| 261 char *p2; | |
| 262 | |
| 263 after = 1; | |
| 264 for (p2 = *p; *p2 && *p2 != ',' && !isspace(*p2); p2++) | |
| 265 /* do nothing */ ; | |
| 266 | |
| 267 sym = lw_strndup(*p, p2 - *p); | |
| 385 | 268 *p = p2; |
| 356 | 269 } |
| 270 if (!sym) | |
| 271 { | |
| 272 lwasm_register_error(as, l, "No symbol for IMPORT"); | |
| 273 return; | |
| 274 } | |
| 275 | |
| 276 // add the symbol to the "export" list (which will be resolved | |
| 277 // after the parse pass is complete | |
| 278 e = lw_alloc(sizeof(importlist_t)); | |
| 279 e -> next = as -> importlist; | |
| 280 e -> symbol = lw_strdup(sym); | |
| 281 as -> importlist = e; | |
| 282 lw_free(sym); | |
| 283 | |
| 284 if (after && **p == ',') | |
| 285 { | |
| 286 (*p)++; | |
| 287 for (; **p && isspace(**p); (*p)++) | |
| 288 /* do nothing */ ; | |
| 289 goto again; | |
| 290 } | |
| 291 } | |
| 380 | 292 |
| 293 PARSEFUNC(pseudo_parse_extdep) | |
| 294 { | |
| 295 int after = 0; | |
| 296 char *sym = NULL; | |
| 297 importlist_t *e; | |
| 298 | |
| 299 if (as -> output_format != OUTPUT_OBJ) | |
| 300 { | |
| 301 lwasm_register_error(as, l, "EXTDEP only supported for object target"); | |
| 302 return; | |
| 303 } | |
| 304 | |
| 305 if (!as -> csect) | |
| 306 { | |
| 307 lwasm_register_error(as, l, "EXTDEP must be within a section"); | |
| 308 return; | |
| 309 } | |
| 310 | |
|
387
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
385
diff
changeset
|
311 l -> len = 0; |
|
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
385
diff
changeset
|
312 |
| 380 | 313 if (l -> sym) |
| 314 sym = lw_strdup(l -> sym); | |
| 315 | |
| 316 if (l -> sym) | |
| 317 { | |
| 318 skip_operand(p); | |
| 319 } | |
| 320 | |
| 321 again: | |
| 322 if (after || !sym) | |
| 323 { | |
| 324 char *p2; | |
| 325 | |
| 326 after = 1; | |
| 327 for (p2 = *p; *p2 && *p2 != ',' && !isspace(*p2); p2++) | |
| 328 /* do nothing */ ; | |
| 329 | |
| 330 sym = lw_strndup(*p, p2 - *p); | |
| 331 } | |
| 332 if (!sym) | |
| 333 { | |
| 334 lwasm_register_error(as, l, "No symbol for EXTDEP"); | |
| 335 return; | |
| 336 } | |
| 337 | |
| 338 // create a zero-width dependency | |
| 339 { | |
| 340 lw_expr_t e; | |
| 341 e = lw_expr_build(lw_expr_type_int, 0); | |
| 342 lwasm_emitexpr(l, e, 0); | |
| 343 lw_expr_destroy(e); | |
| 344 } | |
| 345 | |
| 346 if (after && **p == ',') | |
| 347 { | |
| 348 (*p)++; | |
| 349 for (; **p && isspace(**p); (*p)++) | |
| 350 /* do nothing */ ; | |
| 351 goto again; | |
| 352 } | |
| 353 } |