| 1 | // resolve.cc -- symbol resolution for gold |
| 2 | |
| 3 | #include "gold.h" |
| 4 | |
| 5 | #include "elfcpp.h" |
| 6 | #include "target.h" |
| 7 | #include "object.h" |
| 8 | #include "symtab.h" |
| 9 | |
| 10 | namespace gold |
| 11 | { |
| 12 | |
| 13 | // Symbol methods used in this file. |
| 14 | |
| 15 | // Override the fields in Symbol. |
| 16 | |
| 17 | template<int size, bool big_endian> |
| 18 | void |
| 19 | Symbol::override_base(const elfcpp::Sym<size, big_endian>& sym, |
| 20 | Object* object, const char* version) |
| 21 | { |
| 22 | gold_assert(this->source_ == FROM_OBJECT); |
| 23 | this->u_.from_object.object = object; |
| 24 | if (version != NULL && this->version() != version) |
| 25 | { |
| 26 | gold_assert(this->version() == NULL); |
| 27 | this->version_ = version; |
| 28 | } |
| 29 | // FIXME: Handle SHN_XINDEX. |
| 30 | this->u_.from_object.shndx = sym.get_st_shndx(); |
| 31 | this->type_ = sym.get_st_type(); |
| 32 | this->binding_ = sym.get_st_bind(); |
| 33 | this->visibility_ = sym.get_st_visibility(); |
| 34 | this->nonvis_ = sym.get_st_nonvis(); |
| 35 | } |
| 36 | |
| 37 | // Override the fields in Sized_symbol. |
| 38 | |
| 39 | template<int size> |
| 40 | template<bool big_endian> |
| 41 | void |
| 42 | Sized_symbol<size>::override(const elfcpp::Sym<size, big_endian>& sym, |
| 43 | Object* object, const char* version) |
| 44 | { |
| 45 | this->override_base(sym, object, version); |
| 46 | this->value_ = sym.get_st_value(); |
| 47 | this->symsize_ = sym.get_st_size(); |
| 48 | } |
| 49 | |
| 50 | // Resolve a symbol. This is called the second and subsequent times |
| 51 | // we see a symbol. TO is the pre-existing symbol. SYM is the new |
| 52 | // symbol, seen in OBJECT. VERSION of the version of SYM. |
| 53 | |
| 54 | template<int size, bool big_endian> |
| 55 | void |
| 56 | Symbol_table::resolve(Sized_symbol<size>* to, |
| 57 | const elfcpp::Sym<size, big_endian>& sym, |
| 58 | Object* object, const char* version) |
| 59 | { |
| 60 | if (object->target()->has_resolve()) |
| 61 | { |
| 62 | Sized_target<size, big_endian>* sized_target; |
| 63 | sized_target = object->sized_target |
| 64 | SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( |
| 65 | SELECT_SIZE_ENDIAN_ONLY(size, big_endian)); |
| 66 | sized_target->resolve(to, sym, object, version); |
| 67 | return; |
| 68 | } |
| 69 | |
| 70 | // Build a little code for each symbol. |
| 71 | // Bit 0: 0 for global, 1 for weak. |
| 72 | // Bit 1: 0 for regular object, 1 for shared object |
| 73 | // Bits 2-3: 0 for normal, 1 for undefined, 2 for common |
| 74 | // This gives us values from 0 to 11: |
| 75 | |
| 76 | enum |
| 77 | { |
| 78 | DEF = 0, |
| 79 | WEAK_DEF = 1, |
| 80 | DYN_DEF = 2, |
| 81 | DYN_WEAK_DEF = 3, |
| 82 | UNDEF = 4, |
| 83 | WEAK_UNDEF = 5, |
| 84 | DYN_UNDEF = 6, |
| 85 | DYN_WEAK_UNDEF = 7, |
| 86 | COMMON = 8, |
| 87 | WEAK_COMMON = 9, |
| 88 | DYN_COMMON = 10, |
| 89 | DYN_WEAK_COMMON = 11 |
| 90 | }; |
| 91 | |
| 92 | int tobits; |
| 93 | switch (to->binding()) |
| 94 | { |
| 95 | case elfcpp::STB_GLOBAL: |
| 96 | tobits = 0; |
| 97 | break; |
| 98 | |
| 99 | case elfcpp::STB_WEAK: |
| 100 | tobits = 1; |
| 101 | break; |
| 102 | |
| 103 | case elfcpp::STB_LOCAL: |
| 104 | // We should only see externally visible symbols in the symbol |
| 105 | // table. |
| 106 | gold_unreachable(); |
| 107 | |
| 108 | default: |
| 109 | // Any target which wants to handle STB_LOOS, etc., needs to |
| 110 | // define a resolve method. |
| 111 | gold_unreachable(); |
| 112 | } |
| 113 | |
| 114 | if (to->source() == Symbol::FROM_OBJECT |
| 115 | && to->object()->is_dynamic()) |
| 116 | tobits |= (1 << 1); |
| 117 | |
| 118 | switch (to->shndx()) |
| 119 | { |
| 120 | case elfcpp::SHN_UNDEF: |
| 121 | tobits |= (1 << 2); |
| 122 | break; |
| 123 | |
| 124 | case elfcpp::SHN_COMMON: |
| 125 | tobits |= (2 << 2); |
| 126 | break; |
| 127 | |
| 128 | default: |
| 129 | if (to->type() == elfcpp::STT_COMMON) |
| 130 | tobits |= (2 << 2); |
| 131 | break; |
| 132 | } |
| 133 | |
| 134 | int frombits; |
| 135 | switch (sym.get_st_bind()) |
| 136 | { |
| 137 | case elfcpp::STB_GLOBAL: |
| 138 | frombits = 0; |
| 139 | break; |
| 140 | |
| 141 | case elfcpp::STB_WEAK: |
| 142 | frombits = 1; |
| 143 | break; |
| 144 | |
| 145 | case elfcpp::STB_LOCAL: |
| 146 | fprintf(stderr, |
| 147 | _("%s: %s: invalid STB_LOCAL symbol %s in external symbols\n"), |
| 148 | program_name, object->name().c_str(), to->name()); |
| 149 | gold_exit(false); |
| 150 | |
| 151 | default: |
| 152 | fprintf(stderr, |
| 153 | _("%s: %s: unsupported symbol binding %d for symbol %s\n"), |
| 154 | program_name, object->name().c_str(), |
| 155 | static_cast<int>(sym.get_st_bind()), to->name()); |
| 156 | gold_exit(false); |
| 157 | } |
| 158 | |
| 159 | if (!object->is_dynamic()) |
| 160 | { |
| 161 | // Record that we've seen this symbol in a regular object. |
| 162 | to->set_in_reg(); |
| 163 | } |
| 164 | else |
| 165 | { |
| 166 | frombits |= (1 << 1); |
| 167 | |
| 168 | // Record that we've seen this symbol in a dynamic object. |
| 169 | to->set_in_dyn(); |
| 170 | } |
| 171 | |
| 172 | switch (sym.get_st_shndx()) |
| 173 | { |
| 174 | case elfcpp::SHN_UNDEF: |
| 175 | frombits |= (1 << 2); |
| 176 | break; |
| 177 | |
| 178 | case elfcpp::SHN_COMMON: |
| 179 | frombits |= (2 << 2); |
| 180 | break; |
| 181 | |
| 182 | default: |
| 183 | if (sym.get_st_type() == elfcpp::STT_COMMON) |
| 184 | frombits |= (2 << 2); |
| 185 | break; |
| 186 | } |
| 187 | |
| 188 | if ((tobits & (1 << 1)) != (frombits & (1 << 1))) |
| 189 | { |
| 190 | // This symbol is seen in both a dynamic object and a regular |
| 191 | // object. That means that we need the symbol to go into the |
| 192 | // dynamic symbol table, so that the dynamic linker can use the |
| 193 | // regular symbol to override or define the dynamic symbol. |
| 194 | to->set_needs_dynsym_entry(); |
| 195 | } |
| 196 | |
| 197 | // FIXME: Warn if either but not both of TO and SYM are STT_TLS. |
| 198 | |
| 199 | // We use a giant switch table for symbol resolution. This code is |
| 200 | // unwieldy, but: 1) it is efficient; 2) we definitely handle all |
| 201 | // cases; 3) it is easy to change the handling of a particular case. |
| 202 | // The alternative would be a series of conditionals, but it is easy |
| 203 | // to get the ordering wrong. This could also be done as a table, |
| 204 | // but that is no easier to understand than this large switch |
| 205 | // statement. |
| 206 | |
| 207 | switch (tobits * 16 + frombits) |
| 208 | { |
| 209 | case DEF * 16 + DEF: |
| 210 | // Two definitions of the same symbol. |
| 211 | fprintf(stderr, "%s: %s: multiple definition of %s\n", |
| 212 | program_name, object->name().c_str(), to->name()); |
| 213 | // FIXME: Report locations. Record that we have seen an error. |
| 214 | return; |
| 215 | |
| 216 | case WEAK_DEF * 16 + DEF: |
| 217 | // We've seen a weak definition, and now we see a strong |
| 218 | // definition. In the original SVR4 linker, this was treated as |
| 219 | // a multiple definition error. In the Solaris linker and the |
| 220 | // GNU linker, a weak definition followed by a regular |
| 221 | // definition causes the weak definition to be overridden. We |
| 222 | // are currently compatible with the GNU linker. In the future |
| 223 | // we should add a target specific option to change this. |
| 224 | // FIXME. |
| 225 | to->override(sym, object, version); |
| 226 | return; |
| 227 | |
| 228 | case DYN_DEF * 16 + DEF: |
| 229 | case DYN_WEAK_DEF * 16 + DEF: |
| 230 | // We've seen a definition in a dynamic object, and now we see a |
| 231 | // definition in a regular object. The definition in the |
| 232 | // regular object overrides the definition in the dynamic |
| 233 | // object. |
| 234 | to->override(sym, object, version); |
| 235 | return; |
| 236 | |
| 237 | case UNDEF * 16 + DEF: |
| 238 | case WEAK_UNDEF * 16 + DEF: |
| 239 | case DYN_UNDEF * 16 + DEF: |
| 240 | case DYN_WEAK_UNDEF * 16 + DEF: |
| 241 | // We've seen an undefined reference, and now we see a |
| 242 | // definition. We use the definition. |
| 243 | to->override(sym, object, version); |
| 244 | return; |
| 245 | |
| 246 | case COMMON * 16 + DEF: |
| 247 | case WEAK_COMMON * 16 + DEF: |
| 248 | case DYN_COMMON * 16 + DEF: |
| 249 | case DYN_WEAK_COMMON * 16 + DEF: |
| 250 | // We've seen a common symbol and now we see a definition. The |
| 251 | // definition overrides. FIXME: We should optionally issue, version a |
| 252 | // warning. |
| 253 | to->override(sym, object, version); |
| 254 | return; |
| 255 | |
| 256 | case DEF * 16 + WEAK_DEF: |
| 257 | case WEAK_DEF * 16 + WEAK_DEF: |
| 258 | // We've seen a definition and now we see a weak definition. We |
| 259 | // ignore the new weak definition. |
| 260 | return; |
| 261 | |
| 262 | case DYN_DEF * 16 + WEAK_DEF: |
| 263 | case DYN_WEAK_DEF * 16 + WEAK_DEF: |
| 264 | // We've seen a dynamic definition and now we see a regular weak |
| 265 | // definition. The regular weak definition overrides. |
| 266 | to->override(sym, object, version); |
| 267 | return; |
| 268 | |
| 269 | case UNDEF * 16 + WEAK_DEF: |
| 270 | case WEAK_UNDEF * 16 + WEAK_DEF: |
| 271 | case DYN_UNDEF * 16 + WEAK_DEF: |
| 272 | case DYN_WEAK_UNDEF * 16 + WEAK_DEF: |
| 273 | // A weak definition of a currently undefined symbol. |
| 274 | to->override(sym, object, version); |
| 275 | return; |
| 276 | |
| 277 | case COMMON * 16 + WEAK_DEF: |
| 278 | case WEAK_COMMON * 16 + WEAK_DEF: |
| 279 | // A weak definition does not override a common definition. |
| 280 | return; |
| 281 | |
| 282 | case DYN_COMMON * 16 + WEAK_DEF: |
| 283 | case DYN_WEAK_COMMON * 16 + WEAK_DEF: |
| 284 | // A weak definition does override a definition in a dynamic |
| 285 | // object. FIXME: We should optionally issue a warning. |
| 286 | to->override(sym, object, version); |
| 287 | return; |
| 288 | |
| 289 | case DEF * 16 + DYN_DEF: |
| 290 | case WEAK_DEF * 16 + DYN_DEF: |
| 291 | case DYN_DEF * 16 + DYN_DEF: |
| 292 | case DYN_WEAK_DEF * 16 + DYN_DEF: |
| 293 | // Ignore a dynamic definition if we already have a definition. |
| 294 | return; |
| 295 | |
| 296 | case UNDEF * 16 + DYN_DEF: |
| 297 | case WEAK_UNDEF * 16 + DYN_DEF: |
| 298 | case DYN_UNDEF * 16 + DYN_DEF: |
| 299 | case DYN_WEAK_UNDEF * 16 + DYN_DEF: |
| 300 | // Use a dynamic definition if we have a reference. |
| 301 | to->override(sym, object, version); |
| 302 | return; |
| 303 | |
| 304 | case COMMON * 16 + DYN_DEF: |
| 305 | case WEAK_COMMON * 16 + DYN_DEF: |
| 306 | case DYN_COMMON * 16 + DYN_DEF: |
| 307 | case DYN_WEAK_COMMON * 16 + DYN_DEF: |
| 308 | // Ignore a dynamic definition if we already have a common |
| 309 | // definition. |
| 310 | return; |
| 311 | |
| 312 | case DEF * 16 + DYN_WEAK_DEF: |
| 313 | case WEAK_DEF * 16 + DYN_WEAK_DEF: |
| 314 | case DYN_DEF * 16 + DYN_WEAK_DEF: |
| 315 | case DYN_WEAK_DEF * 16 + DYN_WEAK_DEF: |
| 316 | // Ignore a weak dynamic definition if we already have a |
| 317 | // definition. |
| 318 | return; |
| 319 | |
| 320 | case UNDEF * 16 + DYN_WEAK_DEF: |
| 321 | case WEAK_UNDEF * 16 + DYN_WEAK_DEF: |
| 322 | case DYN_UNDEF * 16 + DYN_WEAK_DEF: |
| 323 | case DYN_WEAK_UNDEF * 16 + DYN_WEAK_DEF: |
| 324 | // Use a weak dynamic definition if we have a reference. |
| 325 | to->override(sym, object, version); |
| 326 | return; |
| 327 | |
| 328 | case COMMON * 16 + DYN_WEAK_DEF: |
| 329 | case WEAK_COMMON * 16 + DYN_WEAK_DEF: |
| 330 | case DYN_COMMON * 16 + DYN_WEAK_DEF: |
| 331 | case DYN_WEAK_COMMON * 16 + DYN_WEAK_DEF: |
| 332 | // Ignore a weak dynamic definition if we already have a common |
| 333 | // definition. |
| 334 | return; |
| 335 | |
| 336 | case DEF * 16 + UNDEF: |
| 337 | case WEAK_DEF * 16 + UNDEF: |
| 338 | case DYN_DEF * 16 + UNDEF: |
| 339 | case DYN_WEAK_DEF * 16 + UNDEF: |
| 340 | case UNDEF * 16 + UNDEF: |
| 341 | // A new undefined reference tells us nothing. |
| 342 | return; |
| 343 | |
| 344 | case WEAK_UNDEF * 16 + UNDEF: |
| 345 | case DYN_UNDEF * 16 + UNDEF: |
| 346 | case DYN_WEAK_UNDEF * 16 + UNDEF: |
| 347 | // A strong undef overrides a dynamic or weak undef. |
| 348 | to->override(sym, object, version); |
| 349 | return; |
| 350 | |
| 351 | case COMMON * 16 + UNDEF: |
| 352 | case WEAK_COMMON * 16 + UNDEF: |
| 353 | case DYN_COMMON * 16 + UNDEF: |
| 354 | case DYN_WEAK_COMMON * 16 + UNDEF: |
| 355 | // A new undefined reference tells us nothing. |
| 356 | return; |
| 357 | |
| 358 | case DEF * 16 + WEAK_UNDEF: |
| 359 | case WEAK_DEF * 16 + WEAK_UNDEF: |
| 360 | case DYN_DEF * 16 + WEAK_UNDEF: |
| 361 | case DYN_WEAK_DEF * 16 + WEAK_UNDEF: |
| 362 | case UNDEF * 16 + WEAK_UNDEF: |
| 363 | case WEAK_UNDEF * 16 + WEAK_UNDEF: |
| 364 | case DYN_UNDEF * 16 + WEAK_UNDEF: |
| 365 | case DYN_WEAK_UNDEF * 16 + WEAK_UNDEF: |
| 366 | case COMMON * 16 + WEAK_UNDEF: |
| 367 | case WEAK_COMMON * 16 + WEAK_UNDEF: |
| 368 | case DYN_COMMON * 16 + WEAK_UNDEF: |
| 369 | case DYN_WEAK_COMMON * 16 + WEAK_UNDEF: |
| 370 | // A new weak undefined reference tells us nothing. |
| 371 | return; |
| 372 | |
| 373 | case DEF * 16 + DYN_UNDEF: |
| 374 | case WEAK_DEF * 16 + DYN_UNDEF: |
| 375 | case DYN_DEF * 16 + DYN_UNDEF: |
| 376 | case DYN_WEAK_DEF * 16 + DYN_UNDEF: |
| 377 | case UNDEF * 16 + DYN_UNDEF: |
| 378 | case WEAK_UNDEF * 16 + DYN_UNDEF: |
| 379 | case DYN_UNDEF * 16 + DYN_UNDEF: |
| 380 | case DYN_WEAK_UNDEF * 16 + DYN_UNDEF: |
| 381 | case COMMON * 16 + DYN_UNDEF: |
| 382 | case WEAK_COMMON * 16 + DYN_UNDEF: |
| 383 | case DYN_COMMON * 16 + DYN_UNDEF: |
| 384 | case DYN_WEAK_COMMON * 16 + DYN_UNDEF: |
| 385 | // A new dynamic undefined reference tells us nothing. |
| 386 | return; |
| 387 | |
| 388 | case DEF * 16 + DYN_WEAK_UNDEF: |
| 389 | case WEAK_DEF * 16 + DYN_WEAK_UNDEF: |
| 390 | case DYN_DEF * 16 + DYN_WEAK_UNDEF: |
| 391 | case DYN_WEAK_DEF * 16 + DYN_WEAK_UNDEF: |
| 392 | case UNDEF * 16 + DYN_WEAK_UNDEF: |
| 393 | case WEAK_UNDEF * 16 + DYN_WEAK_UNDEF: |
| 394 | case DYN_UNDEF * 16 + DYN_WEAK_UNDEF: |
| 395 | case DYN_WEAK_UNDEF * 16 + DYN_WEAK_UNDEF: |
| 396 | case COMMON * 16 + DYN_WEAK_UNDEF: |
| 397 | case WEAK_COMMON * 16 + DYN_WEAK_UNDEF: |
| 398 | case DYN_COMMON * 16 + DYN_WEAK_UNDEF: |
| 399 | case DYN_WEAK_COMMON * 16 + DYN_WEAK_UNDEF: |
| 400 | // A new weak dynamic undefined reference tells us nothing. |
| 401 | return; |
| 402 | |
| 403 | case DEF * 16 + COMMON: |
| 404 | // A common symbol does not override a definition. |
| 405 | return; |
| 406 | |
| 407 | case WEAK_DEF * 16 + COMMON: |
| 408 | case DYN_DEF * 16 + COMMON: |
| 409 | case DYN_WEAK_DEF * 16 + COMMON: |
| 410 | // A common symbol does override a weak definition or a dynamic |
| 411 | // definition. |
| 412 | to->override(sym, object, version); |
| 413 | return; |
| 414 | |
| 415 | case UNDEF * 16 + COMMON: |
| 416 | case WEAK_UNDEF * 16 + COMMON: |
| 417 | case DYN_UNDEF * 16 + COMMON: |
| 418 | case DYN_WEAK_UNDEF * 16 + COMMON: |
| 419 | // A common symbol is a definition for a reference. |
| 420 | to->override(sym, object, version); |
| 421 | return; |
| 422 | |
| 423 | case COMMON * 16 + COMMON: |
| 424 | // Set the size to the maximum. |
| 425 | if (sym.get_st_size() > to->symsize()) |
| 426 | to->set_symsize(sym.get_st_size()); |
| 427 | return; |
| 428 | |
| 429 | case WEAK_COMMON * 16 + COMMON: |
| 430 | // I'm not sure just what a weak common symbol means, but |
| 431 | // presumably it can be overridden by a regular common symbol. |
| 432 | to->override(sym, object, version); |
| 433 | return; |
| 434 | |
| 435 | case DYN_COMMON * 16 + COMMON: |
| 436 | case DYN_WEAK_COMMON * 16 + COMMON: |
| 437 | { |
| 438 | // Use the real common symbol, but adjust the size if necessary. |
| 439 | typename Sized_symbol<size>::Size_type symsize = to->symsize(); |
| 440 | to->override(sym, object, version); |
| 441 | if (to->symsize() < symsize) |
| 442 | to->set_symsize(symsize); |
| 443 | } |
| 444 | return; |
| 445 | |
| 446 | case DEF * 16 + WEAK_COMMON: |
| 447 | case WEAK_DEF * 16 + WEAK_COMMON: |
| 448 | case DYN_DEF * 16 + WEAK_COMMON: |
| 449 | case DYN_WEAK_DEF * 16 + WEAK_COMMON: |
| 450 | // Whatever a weak common symbol is, it won't override a |
| 451 | // definition. |
| 452 | return; |
| 453 | |
| 454 | case UNDEF * 16 + WEAK_COMMON: |
| 455 | case WEAK_UNDEF * 16 + WEAK_COMMON: |
| 456 | case DYN_UNDEF * 16 + WEAK_COMMON: |
| 457 | case DYN_WEAK_UNDEF * 16 + WEAK_COMMON: |
| 458 | // A weak common symbol is better than an undefined symbol. |
| 459 | to->override(sym, object, version); |
| 460 | return; |
| 461 | |
| 462 | case COMMON * 16 + WEAK_COMMON: |
| 463 | case WEAK_COMMON * 16 + WEAK_COMMON: |
| 464 | case DYN_COMMON * 16 + WEAK_COMMON: |
| 465 | case DYN_WEAK_COMMON * 16 + WEAK_COMMON: |
| 466 | // Ignore a weak common symbol in the presence of a real common |
| 467 | // symbol. |
| 468 | return; |
| 469 | |
| 470 | case DEF * 16 + DYN_COMMON: |
| 471 | case WEAK_DEF * 16 + DYN_COMMON: |
| 472 | case DYN_DEF * 16 + DYN_COMMON: |
| 473 | case DYN_WEAK_DEF * 16 + DYN_COMMON: |
| 474 | // Ignore a dynamic common symbol in the presence of a |
| 475 | // definition. |
| 476 | return; |
| 477 | |
| 478 | case UNDEF * 16 + DYN_COMMON: |
| 479 | case WEAK_UNDEF * 16 + DYN_COMMON: |
| 480 | case DYN_UNDEF * 16 + DYN_COMMON: |
| 481 | case DYN_WEAK_UNDEF * 16 + DYN_COMMON: |
| 482 | // A dynamic common symbol is a definition of sorts. |
| 483 | to->override(sym, object, version); |
| 484 | return; |
| 485 | |
| 486 | case COMMON * 16 + DYN_COMMON: |
| 487 | case WEAK_COMMON * 16 + DYN_COMMON: |
| 488 | case DYN_COMMON * 16 + DYN_COMMON: |
| 489 | case DYN_WEAK_COMMON * 16 + DYN_COMMON: |
| 490 | // Set the size to the maximum. |
| 491 | if (sym.get_st_size() > to->symsize()) |
| 492 | to->set_symsize(sym.get_st_size()); |
| 493 | return; |
| 494 | |
| 495 | case DEF * 16 + DYN_WEAK_COMMON: |
| 496 | case WEAK_DEF * 16 + DYN_WEAK_COMMON: |
| 497 | case DYN_DEF * 16 + DYN_WEAK_COMMON: |
| 498 | case DYN_WEAK_DEF * 16 + DYN_WEAK_COMMON: |
| 499 | // A common symbol is ignored in the face of a definition. |
| 500 | return; |
| 501 | |
| 502 | case UNDEF * 16 + DYN_WEAK_COMMON: |
| 503 | case WEAK_UNDEF * 16 + DYN_WEAK_COMMON: |
| 504 | case DYN_UNDEF * 16 + DYN_WEAK_COMMON: |
| 505 | case DYN_WEAK_UNDEF * 16 + DYN_WEAK_COMMON: |
| 506 | // I guess a weak common symbol is better than a definition. |
| 507 | to->override(sym, object, version); |
| 508 | return; |
| 509 | |
| 510 | case COMMON * 16 + DYN_WEAK_COMMON: |
| 511 | case WEAK_COMMON * 16 + DYN_WEAK_COMMON: |
| 512 | case DYN_COMMON * 16 + DYN_WEAK_COMMON: |
| 513 | case DYN_WEAK_COMMON * 16 + DYN_WEAK_COMMON: |
| 514 | // Set the size to the maximum. |
| 515 | if (sym.get_st_size() > to->symsize()) |
| 516 | to->set_symsize(sym.get_st_size()); |
| 517 | return; |
| 518 | |
| 519 | default: |
| 520 | gold_unreachable(); |
| 521 | } |
| 522 | } |
| 523 | |
| 524 | // Instantiate the templates we need. We could use the configure |
| 525 | // script to restrict this to only the ones needed for implemented |
| 526 | // targets. |
| 527 | |
| 528 | template |
| 529 | void |
| 530 | Symbol_table::resolve<32, true>( |
| 531 | Sized_symbol<32>* to, |
| 532 | const elfcpp::Sym<32, true>& sym, |
| 533 | Object* object, |
| 534 | const char* version); |
| 535 | |
| 536 | template |
| 537 | void |
| 538 | Symbol_table::resolve<32, false>( |
| 539 | Sized_symbol<32>* to, |
| 540 | const elfcpp::Sym<32, false>& sym, |
| 541 | Object* object, |
| 542 | const char* version); |
| 543 | |
| 544 | template |
| 545 | void |
| 546 | Symbol_table::resolve<64, true>( |
| 547 | Sized_symbol<64>* to, |
| 548 | const elfcpp::Sym<64, true>& sym, |
| 549 | Object* object, |
| 550 | const char* version); |
| 551 | |
| 552 | template |
| 553 | void |
| 554 | Symbol_table::resolve<64, false>( |
| 555 | Sized_symbol<64>* to, |
| 556 | const elfcpp::Sym<64, false>& sym, |
| 557 | Object* object, |
| 558 | const char* version); |
| 559 | |
| 560 | } // End namespace gold. |