| 1 | // symtab.cc -- the gold symbol table |
| 2 | |
| 3 | // Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
| 4 | // Written by Ian Lance Taylor <iant@google.com>. |
| 5 | |
| 6 | // This file is part of gold. |
| 7 | |
| 8 | // This program is free software; you can redistribute it and/or modify |
| 9 | // it under the terms of the GNU General Public License as published by |
| 10 | // the Free Software Foundation; either version 3 of the License, or |
| 11 | // (at your option) any later version. |
| 12 | |
| 13 | // This program is distributed in the hope that it will be useful, |
| 14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | // GNU General Public License for more details. |
| 17 | |
| 18 | // You should have received a copy of the GNU General Public License |
| 19 | // along with this program; if not, write to the Free Software |
| 20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | // MA 02110-1301, USA. |
| 22 | |
| 23 | #include "gold.h" |
| 24 | |
| 25 | #include <cstring> |
| 26 | #include <stdint.h> |
| 27 | #include <algorithm> |
| 28 | #include <set> |
| 29 | #include <string> |
| 30 | #include <utility> |
| 31 | #include "demangle.h" |
| 32 | |
| 33 | #include "gc.h" |
| 34 | #include "object.h" |
| 35 | #include "dwarf_reader.h" |
| 36 | #include "dynobj.h" |
| 37 | #include "output.h" |
| 38 | #include "target.h" |
| 39 | #include "workqueue.h" |
| 40 | #include "symtab.h" |
| 41 | #include "script.h" |
| 42 | #include "plugin.h" |
| 43 | #include "incremental.h" |
| 44 | |
| 45 | namespace gold |
| 46 | { |
| 47 | |
| 48 | // Class Symbol. |
| 49 | |
| 50 | // Initialize fields in Symbol. This initializes everything except u_ |
| 51 | // and source_. |
| 52 | |
| 53 | void |
| 54 | Symbol::init_fields(const char* name, const char* version, |
| 55 | elfcpp::STT type, elfcpp::STB binding, |
| 56 | elfcpp::STV visibility, unsigned char nonvis) |
| 57 | { |
| 58 | this->name_ = name; |
| 59 | this->version_ = version; |
| 60 | this->symtab_index_ = 0; |
| 61 | this->dynsym_index_ = 0; |
| 62 | this->got_offsets_.init(); |
| 63 | this->plt_offset_ = -1U; |
| 64 | this->type_ = type; |
| 65 | this->binding_ = binding; |
| 66 | this->visibility_ = visibility; |
| 67 | this->nonvis_ = nonvis; |
| 68 | this->is_def_ = false; |
| 69 | this->is_forwarder_ = false; |
| 70 | this->has_alias_ = false; |
| 71 | this->needs_dynsym_entry_ = false; |
| 72 | this->in_reg_ = false; |
| 73 | this->in_dyn_ = false; |
| 74 | this->has_warning_ = false; |
| 75 | this->is_copied_from_dynobj_ = false; |
| 76 | this->is_forced_local_ = false; |
| 77 | this->is_ordinary_shndx_ = false; |
| 78 | this->in_real_elf_ = false; |
| 79 | this->is_defined_in_discarded_section_ = false; |
| 80 | this->undef_binding_set_ = false; |
| 81 | this->undef_binding_weak_ = false; |
| 82 | this->is_predefined_ = false; |
| 83 | } |
| 84 | |
| 85 | // Return the demangled version of the symbol's name, but only |
| 86 | // if the --demangle flag was set. |
| 87 | |
| 88 | static std::string |
| 89 | demangle(const char* name) |
| 90 | { |
| 91 | if (!parameters->options().do_demangle()) |
| 92 | return name; |
| 93 | |
| 94 | // cplus_demangle allocates memory for the result it returns, |
| 95 | // and returns NULL if the name is already demangled. |
| 96 | char* demangled_name = cplus_demangle(name, DMGL_ANSI | DMGL_PARAMS); |
| 97 | if (demangled_name == NULL) |
| 98 | return name; |
| 99 | |
| 100 | std::string retval(demangled_name); |
| 101 | free(demangled_name); |
| 102 | return retval; |
| 103 | } |
| 104 | |
| 105 | std::string |
| 106 | Symbol::demangled_name() const |
| 107 | { |
| 108 | return demangle(this->name()); |
| 109 | } |
| 110 | |
| 111 | // Initialize the fields in the base class Symbol for SYM in OBJECT. |
| 112 | |
| 113 | template<int size, bool big_endian> |
| 114 | void |
| 115 | Symbol::init_base_object(const char* name, const char* version, Object* object, |
| 116 | const elfcpp::Sym<size, big_endian>& sym, |
| 117 | unsigned int st_shndx, bool is_ordinary) |
| 118 | { |
| 119 | this->init_fields(name, version, sym.get_st_type(), sym.get_st_bind(), |
| 120 | sym.get_st_visibility(), sym.get_st_nonvis()); |
| 121 | this->u_.from_object.object = object; |
| 122 | this->u_.from_object.shndx = st_shndx; |
| 123 | this->is_ordinary_shndx_ = is_ordinary; |
| 124 | this->source_ = FROM_OBJECT; |
| 125 | this->in_reg_ = !object->is_dynamic(); |
| 126 | this->in_dyn_ = object->is_dynamic(); |
| 127 | this->in_real_elf_ = object->pluginobj() == NULL; |
| 128 | } |
| 129 | |
| 130 | // Initialize the fields in the base class Symbol for a symbol defined |
| 131 | // in an Output_data. |
| 132 | |
| 133 | void |
| 134 | Symbol::init_base_output_data(const char* name, const char* version, |
| 135 | Output_data* od, elfcpp::STT type, |
| 136 | elfcpp::STB binding, elfcpp::STV visibility, |
| 137 | unsigned char nonvis, bool offset_is_from_end, |
| 138 | bool is_predefined) |
| 139 | { |
| 140 | this->init_fields(name, version, type, binding, visibility, nonvis); |
| 141 | this->u_.in_output_data.output_data = od; |
| 142 | this->u_.in_output_data.offset_is_from_end = offset_is_from_end; |
| 143 | this->source_ = IN_OUTPUT_DATA; |
| 144 | this->in_reg_ = true; |
| 145 | this->in_real_elf_ = true; |
| 146 | this->is_predefined_ = is_predefined; |
| 147 | } |
| 148 | |
| 149 | // Initialize the fields in the base class Symbol for a symbol defined |
| 150 | // in an Output_segment. |
| 151 | |
| 152 | void |
| 153 | Symbol::init_base_output_segment(const char* name, const char* version, |
| 154 | Output_segment* os, elfcpp::STT type, |
| 155 | elfcpp::STB binding, elfcpp::STV visibility, |
| 156 | unsigned char nonvis, |
| 157 | Segment_offset_base offset_base, |
| 158 | bool is_predefined) |
| 159 | { |
| 160 | this->init_fields(name, version, type, binding, visibility, nonvis); |
| 161 | this->u_.in_output_segment.output_segment = os; |
| 162 | this->u_.in_output_segment.offset_base = offset_base; |
| 163 | this->source_ = IN_OUTPUT_SEGMENT; |
| 164 | this->in_reg_ = true; |
| 165 | this->in_real_elf_ = true; |
| 166 | this->is_predefined_ = is_predefined; |
| 167 | } |
| 168 | |
| 169 | // Initialize the fields in the base class Symbol for a symbol defined |
| 170 | // as a constant. |
| 171 | |
| 172 | void |
| 173 | Symbol::init_base_constant(const char* name, const char* version, |
| 174 | elfcpp::STT type, elfcpp::STB binding, |
| 175 | elfcpp::STV visibility, unsigned char nonvis, |
| 176 | bool is_predefined) |
| 177 | { |
| 178 | this->init_fields(name, version, type, binding, visibility, nonvis); |
| 179 | this->source_ = IS_CONSTANT; |
| 180 | this->in_reg_ = true; |
| 181 | this->in_real_elf_ = true; |
| 182 | this->is_predefined_ = is_predefined; |
| 183 | } |
| 184 | |
| 185 | // Initialize the fields in the base class Symbol for an undefined |
| 186 | // symbol. |
| 187 | |
| 188 | void |
| 189 | Symbol::init_base_undefined(const char* name, const char* version, |
| 190 | elfcpp::STT type, elfcpp::STB binding, |
| 191 | elfcpp::STV visibility, unsigned char nonvis) |
| 192 | { |
| 193 | this->init_fields(name, version, type, binding, visibility, nonvis); |
| 194 | this->dynsym_index_ = -1U; |
| 195 | this->source_ = IS_UNDEFINED; |
| 196 | this->in_reg_ = true; |
| 197 | this->in_real_elf_ = true; |
| 198 | } |
| 199 | |
| 200 | // Allocate a common symbol in the base. |
| 201 | |
| 202 | void |
| 203 | Symbol::allocate_base_common(Output_data* od) |
| 204 | { |
| 205 | gold_assert(this->is_common()); |
| 206 | this->source_ = IN_OUTPUT_DATA; |
| 207 | this->u_.in_output_data.output_data = od; |
| 208 | this->u_.in_output_data.offset_is_from_end = false; |
| 209 | } |
| 210 | |
| 211 | // Initialize the fields in Sized_symbol for SYM in OBJECT. |
| 212 | |
| 213 | template<int size> |
| 214 | template<bool big_endian> |
| 215 | void |
| 216 | Sized_symbol<size>::init_object(const char* name, const char* version, |
| 217 | Object* object, |
| 218 | const elfcpp::Sym<size, big_endian>& sym, |
| 219 | unsigned int st_shndx, bool is_ordinary) |
| 220 | { |
| 221 | this->init_base_object(name, version, object, sym, st_shndx, is_ordinary); |
| 222 | this->value_ = sym.get_st_value(); |
| 223 | this->symsize_ = sym.get_st_size(); |
| 224 | } |
| 225 | |
| 226 | // Initialize the fields in Sized_symbol for a symbol defined in an |
| 227 | // Output_data. |
| 228 | |
| 229 | template<int size> |
| 230 | void |
| 231 | Sized_symbol<size>::init_output_data(const char* name, const char* version, |
| 232 | Output_data* od, Value_type value, |
| 233 | Size_type symsize, elfcpp::STT type, |
| 234 | elfcpp::STB binding, |
| 235 | elfcpp::STV visibility, |
| 236 | unsigned char nonvis, |
| 237 | bool offset_is_from_end, |
| 238 | bool is_predefined) |
| 239 | { |
| 240 | this->init_base_output_data(name, version, od, type, binding, visibility, |
| 241 | nonvis, offset_is_from_end, is_predefined); |
| 242 | this->value_ = value; |
| 243 | this->symsize_ = symsize; |
| 244 | } |
| 245 | |
| 246 | // Initialize the fields in Sized_symbol for a symbol defined in an |
| 247 | // Output_segment. |
| 248 | |
| 249 | template<int size> |
| 250 | void |
| 251 | Sized_symbol<size>::init_output_segment(const char* name, const char* version, |
| 252 | Output_segment* os, Value_type value, |
| 253 | Size_type symsize, elfcpp::STT type, |
| 254 | elfcpp::STB binding, |
| 255 | elfcpp::STV visibility, |
| 256 | unsigned char nonvis, |
| 257 | Segment_offset_base offset_base, |
| 258 | bool is_predefined) |
| 259 | { |
| 260 | this->init_base_output_segment(name, version, os, type, binding, visibility, |
| 261 | nonvis, offset_base, is_predefined); |
| 262 | this->value_ = value; |
| 263 | this->symsize_ = symsize; |
| 264 | } |
| 265 | |
| 266 | // Initialize the fields in Sized_symbol for a symbol defined as a |
| 267 | // constant. |
| 268 | |
| 269 | template<int size> |
| 270 | void |
| 271 | Sized_symbol<size>::init_constant(const char* name, const char* version, |
| 272 | Value_type value, Size_type symsize, |
| 273 | elfcpp::STT type, elfcpp::STB binding, |
| 274 | elfcpp::STV visibility, unsigned char nonvis, |
| 275 | bool is_predefined) |
| 276 | { |
| 277 | this->init_base_constant(name, version, type, binding, visibility, nonvis, |
| 278 | is_predefined); |
| 279 | this->value_ = value; |
| 280 | this->symsize_ = symsize; |
| 281 | } |
| 282 | |
| 283 | // Initialize the fields in Sized_symbol for an undefined symbol. |
| 284 | |
| 285 | template<int size> |
| 286 | void |
| 287 | Sized_symbol<size>::init_undefined(const char* name, const char* version, |
| 288 | elfcpp::STT type, elfcpp::STB binding, |
| 289 | elfcpp::STV visibility, unsigned char nonvis) |
| 290 | { |
| 291 | this->init_base_undefined(name, version, type, binding, visibility, nonvis); |
| 292 | this->value_ = 0; |
| 293 | this->symsize_ = 0; |
| 294 | } |
| 295 | |
| 296 | // Return an allocated string holding the symbol's name as |
| 297 | // name@version. This is used for relocatable links. |
| 298 | |
| 299 | std::string |
| 300 | Symbol::versioned_name() const |
| 301 | { |
| 302 | gold_assert(this->version_ != NULL); |
| 303 | std::string ret = this->name_; |
| 304 | ret.push_back('@'); |
| 305 | if (this->is_def_) |
| 306 | ret.push_back('@'); |
| 307 | ret += this->version_; |
| 308 | return ret; |
| 309 | } |
| 310 | |
| 311 | // Return true if SHNDX represents a common symbol. |
| 312 | |
| 313 | bool |
| 314 | Symbol::is_common_shndx(unsigned int shndx) |
| 315 | { |
| 316 | return (shndx == elfcpp::SHN_COMMON |
| 317 | || shndx == parameters->target().small_common_shndx() |
| 318 | || shndx == parameters->target().large_common_shndx()); |
| 319 | } |
| 320 | |
| 321 | // Allocate a common symbol. |
| 322 | |
| 323 | template<int size> |
| 324 | void |
| 325 | Sized_symbol<size>::allocate_common(Output_data* od, Value_type value) |
| 326 | { |
| 327 | this->allocate_base_common(od); |
| 328 | this->value_ = value; |
| 329 | } |
| 330 | |
| 331 | // The ""'s around str ensure str is a string literal, so sizeof works. |
| 332 | #define strprefix(var, str) (strncmp(var, str, sizeof("" str "") - 1) == 0) |
| 333 | |
| 334 | // Return true if this symbol should be added to the dynamic symbol |
| 335 | // table. |
| 336 | |
| 337 | inline bool |
| 338 | Symbol::should_add_dynsym_entry(Symbol_table* symtab) const |
| 339 | { |
| 340 | // If the symbol is only present on plugin files, the plugin decided we |
| 341 | // don't need it. |
| 342 | if (!this->in_real_elf()) |
| 343 | return false; |
| 344 | |
| 345 | // If the symbol is used by a dynamic relocation, we need to add it. |
| 346 | if (this->needs_dynsym_entry()) |
| 347 | return true; |
| 348 | |
| 349 | // If this symbol's section is not added, the symbol need not be added. |
| 350 | // The section may have been GCed. Note that export_dynamic is being |
| 351 | // overridden here. This should not be done for shared objects. |
| 352 | if (parameters->options().gc_sections() |
| 353 | && !parameters->options().shared() |
| 354 | && this->source() == Symbol::FROM_OBJECT |
| 355 | && !this->object()->is_dynamic()) |
| 356 | { |
| 357 | Relobj* relobj = static_cast<Relobj*>(this->object()); |
| 358 | bool is_ordinary; |
| 359 | unsigned int shndx = this->shndx(&is_ordinary); |
| 360 | if (is_ordinary && shndx != elfcpp::SHN_UNDEF |
| 361 | && !relobj->is_section_included(shndx) |
| 362 | && !symtab->is_section_folded(relobj, shndx)) |
| 363 | return false; |
| 364 | } |
| 365 | |
| 366 | // If the symbol was forced dynamic in a --dynamic-list file |
| 367 | // or an --export-dynamic-symbol option, add it. |
| 368 | if (!this->is_from_dynobj() |
| 369 | && (parameters->options().in_dynamic_list(this->name()) |
| 370 | || parameters->options().is_export_dynamic_symbol(this->name()))) |
| 371 | { |
| 372 | if (!this->is_forced_local()) |
| 373 | return true; |
| 374 | gold_warning(_("Cannot export local symbol '%s'"), |
| 375 | this->demangled_name().c_str()); |
| 376 | return false; |
| 377 | } |
| 378 | |
| 379 | // If the symbol was forced local in a version script, do not add it. |
| 380 | if (this->is_forced_local()) |
| 381 | return false; |
| 382 | |
| 383 | // If dynamic-list-data was specified, add any STT_OBJECT. |
| 384 | if (parameters->options().dynamic_list_data() |
| 385 | && !this->is_from_dynobj() |
| 386 | && this->type() == elfcpp::STT_OBJECT) |
| 387 | return true; |
| 388 | |
| 389 | // If --dynamic-list-cpp-new was specified, add any new/delete symbol. |
| 390 | // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols. |
| 391 | if ((parameters->options().dynamic_list_cpp_new() |
| 392 | || parameters->options().dynamic_list_cpp_typeinfo()) |
| 393 | && !this->is_from_dynobj()) |
| 394 | { |
| 395 | // TODO(csilvers): We could probably figure out if we're an operator |
| 396 | // new/delete or typeinfo without the need to demangle. |
| 397 | char* demangled_name = cplus_demangle(this->name(), |
| 398 | DMGL_ANSI | DMGL_PARAMS); |
| 399 | if (demangled_name == NULL) |
| 400 | { |
| 401 | // Not a C++ symbol, so it can't satisfy these flags |
| 402 | } |
| 403 | else if (parameters->options().dynamic_list_cpp_new() |
| 404 | && (strprefix(demangled_name, "operator new") |
| 405 | || strprefix(demangled_name, "operator delete"))) |
| 406 | { |
| 407 | free(demangled_name); |
| 408 | return true; |
| 409 | } |
| 410 | else if (parameters->options().dynamic_list_cpp_typeinfo() |
| 411 | && (strprefix(demangled_name, "typeinfo name for") |
| 412 | || strprefix(demangled_name, "typeinfo for"))) |
| 413 | { |
| 414 | free(demangled_name); |
| 415 | return true; |
| 416 | } |
| 417 | else |
| 418 | free(demangled_name); |
| 419 | } |
| 420 | |
| 421 | // If exporting all symbols or building a shared library, |
| 422 | // and the symbol is defined in a regular object and is |
| 423 | // externally visible, we need to add it. |
| 424 | if ((parameters->options().export_dynamic() || parameters->options().shared()) |
| 425 | && !this->is_from_dynobj() |
| 426 | && !this->is_undefined() |
| 427 | && this->is_externally_visible()) |
| 428 | return true; |
| 429 | |
| 430 | return false; |
| 431 | } |
| 432 | |
| 433 | // Return true if the final value of this symbol is known at link |
| 434 | // time. |
| 435 | |
| 436 | bool |
| 437 | Symbol::final_value_is_known() const |
| 438 | { |
| 439 | // If we are not generating an executable, then no final values are |
| 440 | // known, since they will change at runtime. |
| 441 | if (parameters->options().output_is_position_independent() |
| 442 | || parameters->options().relocatable()) |
| 443 | return false; |
| 444 | |
| 445 | // If the symbol is not from an object file, and is not undefined, |
| 446 | // then it is defined, and known. |
| 447 | if (this->source_ != FROM_OBJECT) |
| 448 | { |
| 449 | if (this->source_ != IS_UNDEFINED) |
| 450 | return true; |
| 451 | } |
| 452 | else |
| 453 | { |
| 454 | // If the symbol is from a dynamic object, then the final value |
| 455 | // is not known. |
| 456 | if (this->object()->is_dynamic()) |
| 457 | return false; |
| 458 | |
| 459 | // If the symbol is not undefined (it is defined or common), |
| 460 | // then the final value is known. |
| 461 | if (!this->is_undefined()) |
| 462 | return true; |
| 463 | } |
| 464 | |
| 465 | // If the symbol is undefined, then whether the final value is known |
| 466 | // depends on whether we are doing a static link. If we are doing a |
| 467 | // dynamic link, then the final value could be filled in at runtime. |
| 468 | // This could reasonably be the case for a weak undefined symbol. |
| 469 | return parameters->doing_static_link(); |
| 470 | } |
| 471 | |
| 472 | // Return the output section where this symbol is defined. |
| 473 | |
| 474 | Output_section* |
| 475 | Symbol::output_section() const |
| 476 | { |
| 477 | switch (this->source_) |
| 478 | { |
| 479 | case FROM_OBJECT: |
| 480 | { |
| 481 | unsigned int shndx = this->u_.from_object.shndx; |
| 482 | if (shndx != elfcpp::SHN_UNDEF && this->is_ordinary_shndx_) |
| 483 | { |
| 484 | gold_assert(!this->u_.from_object.object->is_dynamic()); |
| 485 | gold_assert(this->u_.from_object.object->pluginobj() == NULL); |
| 486 | Relobj* relobj = static_cast<Relobj*>(this->u_.from_object.object); |
| 487 | return relobj->output_section(shndx); |
| 488 | } |
| 489 | return NULL; |
| 490 | } |
| 491 | |
| 492 | case IN_OUTPUT_DATA: |
| 493 | return this->u_.in_output_data.output_data->output_section(); |
| 494 | |
| 495 | case IN_OUTPUT_SEGMENT: |
| 496 | case IS_CONSTANT: |
| 497 | case IS_UNDEFINED: |
| 498 | return NULL; |
| 499 | |
| 500 | default: |
| 501 | gold_unreachable(); |
| 502 | } |
| 503 | } |
| 504 | |
| 505 | // Set the symbol's output section. This is used for symbols defined |
| 506 | // in scripts. This should only be called after the symbol table has |
| 507 | // been finalized. |
| 508 | |
| 509 | void |
| 510 | Symbol::set_output_section(Output_section* os) |
| 511 | { |
| 512 | switch (this->source_) |
| 513 | { |
| 514 | case FROM_OBJECT: |
| 515 | case IN_OUTPUT_DATA: |
| 516 | gold_assert(this->output_section() == os); |
| 517 | break; |
| 518 | case IS_CONSTANT: |
| 519 | this->source_ = IN_OUTPUT_DATA; |
| 520 | this->u_.in_output_data.output_data = os; |
| 521 | this->u_.in_output_data.offset_is_from_end = false; |
| 522 | break; |
| 523 | case IN_OUTPUT_SEGMENT: |
| 524 | case IS_UNDEFINED: |
| 525 | default: |
| 526 | gold_unreachable(); |
| 527 | } |
| 528 | } |
| 529 | |
| 530 | // Class Symbol_table. |
| 531 | |
| 532 | Symbol_table::Symbol_table(unsigned int count, |
| 533 | const Version_script_info& version_script) |
| 534 | : saw_undefined_(0), offset_(0), table_(count), namepool_(), |
| 535 | forwarders_(), commons_(), tls_commons_(), small_commons_(), |
| 536 | large_commons_(), forced_locals_(), warnings_(), |
| 537 | version_script_(version_script), gc_(NULL), icf_(NULL) |
| 538 | { |
| 539 | namepool_.reserve(count); |
| 540 | } |
| 541 | |
| 542 | Symbol_table::~Symbol_table() |
| 543 | { |
| 544 | } |
| 545 | |
| 546 | // The symbol table key equality function. This is called with |
| 547 | // Stringpool keys. |
| 548 | |
| 549 | inline bool |
| 550 | Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1, |
| 551 | const Symbol_table_key& k2) const |
| 552 | { |
| 553 | return k1.first == k2.first && k1.second == k2.second; |
| 554 | } |
| 555 | |
| 556 | bool |
| 557 | Symbol_table::is_section_folded(Object* obj, unsigned int shndx) const |
| 558 | { |
| 559 | return (parameters->options().icf_enabled() |
| 560 | && this->icf_->is_section_folded(obj, shndx)); |
| 561 | } |
| 562 | |
| 563 | // For symbols that have been listed with a -u or --export-dynamic-symbol |
| 564 | // option, add them to the work list to avoid gc'ing them. |
| 565 | |
| 566 | void |
| 567 | Symbol_table::gc_mark_undef_symbols(Layout* layout) |
| 568 | { |
| 569 | for (options::String_set::const_iterator p = |
| 570 | parameters->options().undefined_begin(); |
| 571 | p != parameters->options().undefined_end(); |
| 572 | ++p) |
| 573 | { |
| 574 | const char* name = p->c_str(); |
| 575 | Symbol* sym = this->lookup(name); |
| 576 | gold_assert(sym != NULL); |
| 577 | if (sym->source() == Symbol::FROM_OBJECT |
| 578 | && !sym->object()->is_dynamic()) |
| 579 | { |
| 580 | this->gc_mark_symbol(sym); |
| 581 | } |
| 582 | } |
| 583 | |
| 584 | for (options::String_set::const_iterator p = |
| 585 | parameters->options().export_dynamic_symbol_begin(); |
| 586 | p != parameters->options().export_dynamic_symbol_end(); |
| 587 | ++p) |
| 588 | { |
| 589 | const char* name = p->c_str(); |
| 590 | Symbol* sym = this->lookup(name); |
| 591 | // It's not an error if a symbol named by --export-dynamic-symbol |
| 592 | // is undefined. |
| 593 | if (sym != NULL |
| 594 | && sym->source() == Symbol::FROM_OBJECT |
| 595 | && !sym->object()->is_dynamic()) |
| 596 | { |
| 597 | this->gc_mark_symbol(sym); |
| 598 | } |
| 599 | } |
| 600 | |
| 601 | for (Script_options::referenced_const_iterator p = |
| 602 | layout->script_options()->referenced_begin(); |
| 603 | p != layout->script_options()->referenced_end(); |
| 604 | ++p) |
| 605 | { |
| 606 | Symbol* sym = this->lookup(p->c_str()); |
| 607 | gold_assert(sym != NULL); |
| 608 | if (sym->source() == Symbol::FROM_OBJECT |
| 609 | && !sym->object()->is_dynamic()) |
| 610 | { |
| 611 | this->gc_mark_symbol(sym); |
| 612 | } |
| 613 | } |
| 614 | } |
| 615 | |
| 616 | void |
| 617 | Symbol_table::gc_mark_symbol(Symbol* sym) |
| 618 | { |
| 619 | // Add the object and section to the work list. |
| 620 | bool is_ordinary; |
| 621 | unsigned int shndx = sym->shndx(&is_ordinary); |
| 622 | if (is_ordinary && shndx != elfcpp::SHN_UNDEF) |
| 623 | { |
| 624 | gold_assert(this->gc_!= NULL); |
| 625 | this->gc_->worklist().push(Section_id(sym->object(), shndx)); |
| 626 | } |
| 627 | parameters->target().gc_mark_symbol(this, sym); |
| 628 | } |
| 629 | |
| 630 | // When doing garbage collection, keep symbols that have been seen in |
| 631 | // dynamic objects. |
| 632 | inline void |
| 633 | Symbol_table::gc_mark_dyn_syms(Symbol* sym) |
| 634 | { |
| 635 | if (sym->in_dyn() && sym->source() == Symbol::FROM_OBJECT |
| 636 | && !sym->object()->is_dynamic()) |
| 637 | this->gc_mark_symbol(sym); |
| 638 | } |
| 639 | |
| 640 | // Make TO a symbol which forwards to FROM. |
| 641 | |
| 642 | void |
| 643 | Symbol_table::make_forwarder(Symbol* from, Symbol* to) |
| 644 | { |
| 645 | gold_assert(from != to); |
| 646 | gold_assert(!from->is_forwarder() && !to->is_forwarder()); |
| 647 | this->forwarders_[from] = to; |
| 648 | from->set_forwarder(); |
| 649 | } |
| 650 | |
| 651 | // Resolve the forwards from FROM, returning the real symbol. |
| 652 | |
| 653 | Symbol* |
| 654 | Symbol_table::resolve_forwards(const Symbol* from) const |
| 655 | { |
| 656 | gold_assert(from->is_forwarder()); |
| 657 | Unordered_map<const Symbol*, Symbol*>::const_iterator p = |
| 658 | this->forwarders_.find(from); |
| 659 | gold_assert(p != this->forwarders_.end()); |
| 660 | return p->second; |
| 661 | } |
| 662 | |
| 663 | // Look up a symbol by name. |
| 664 | |
| 665 | Symbol* |
| 666 | Symbol_table::lookup(const char* name, const char* version) const |
| 667 | { |
| 668 | Stringpool::Key name_key; |
| 669 | name = this->namepool_.find(name, &name_key); |
| 670 | if (name == NULL) |
| 671 | return NULL; |
| 672 | |
| 673 | Stringpool::Key version_key = 0; |
| 674 | if (version != NULL) |
| 675 | { |
| 676 | version = this->namepool_.find(version, &version_key); |
| 677 | if (version == NULL) |
| 678 | return NULL; |
| 679 | } |
| 680 | |
| 681 | Symbol_table_key key(name_key, version_key); |
| 682 | Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key); |
| 683 | if (p == this->table_.end()) |
| 684 | return NULL; |
| 685 | return p->second; |
| 686 | } |
| 687 | |
| 688 | // Resolve a Symbol with another Symbol. This is only used in the |
| 689 | // unusual case where there are references to both an unversioned |
| 690 | // symbol and a symbol with a version, and we then discover that that |
| 691 | // version is the default version. Because this is unusual, we do |
| 692 | // this the slow way, by converting back to an ELF symbol. |
| 693 | |
| 694 | template<int size, bool big_endian> |
| 695 | void |
| 696 | Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from) |
| 697 | { |
| 698 | unsigned char buf[elfcpp::Elf_sizes<size>::sym_size]; |
| 699 | elfcpp::Sym_write<size, big_endian> esym(buf); |
| 700 | // We don't bother to set the st_name or the st_shndx field. |
| 701 | esym.put_st_value(from->value()); |
| 702 | esym.put_st_size(from->symsize()); |
| 703 | esym.put_st_info(from->binding(), from->type()); |
| 704 | esym.put_st_other(from->visibility(), from->nonvis()); |
| 705 | bool is_ordinary; |
| 706 | unsigned int shndx = from->shndx(&is_ordinary); |
| 707 | this->resolve(to, esym.sym(), shndx, is_ordinary, shndx, from->object(), |
| 708 | from->version()); |
| 709 | if (from->in_reg()) |
| 710 | to->set_in_reg(); |
| 711 | if (from->in_dyn()) |
| 712 | to->set_in_dyn(); |
| 713 | if (parameters->options().gc_sections()) |
| 714 | this->gc_mark_dyn_syms(to); |
| 715 | } |
| 716 | |
| 717 | // Record that a symbol is forced to be local by a version script or |
| 718 | // by visibility. |
| 719 | |
| 720 | void |
| 721 | Symbol_table::force_local(Symbol* sym) |
| 722 | { |
| 723 | if (!sym->is_defined() && !sym->is_common()) |
| 724 | return; |
| 725 | if (sym->is_forced_local()) |
| 726 | { |
| 727 | // We already got this one. |
| 728 | return; |
| 729 | } |
| 730 | sym->set_is_forced_local(); |
| 731 | this->forced_locals_.push_back(sym); |
| 732 | } |
| 733 | |
| 734 | // Adjust NAME for wrapping, and update *NAME_KEY if necessary. This |
| 735 | // is only called for undefined symbols, when at least one --wrap |
| 736 | // option was used. |
| 737 | |
| 738 | const char* |
| 739 | Symbol_table::wrap_symbol(const char* name, Stringpool::Key* name_key) |
| 740 | { |
| 741 | // For some targets, we need to ignore a specific character when |
| 742 | // wrapping, and add it back later. |
| 743 | char prefix = '\0'; |
| 744 | if (name[0] == parameters->target().wrap_char()) |
| 745 | { |
| 746 | prefix = name[0]; |
| 747 | ++name; |
| 748 | } |
| 749 | |
| 750 | if (parameters->options().is_wrap(name)) |
| 751 | { |
| 752 | // Turn NAME into __wrap_NAME. |
| 753 | std::string s; |
| 754 | if (prefix != '\0') |
| 755 | s += prefix; |
| 756 | s += "__wrap_"; |
| 757 | s += name; |
| 758 | |
| 759 | // This will give us both the old and new name in NAMEPOOL_, but |
| 760 | // that is OK. Only the versions we need will wind up in the |
| 761 | // real string table in the output file. |
| 762 | return this->namepool_.add(s.c_str(), true, name_key); |
| 763 | } |
| 764 | |
| 765 | const char* const real_prefix = "__real_"; |
| 766 | const size_t real_prefix_length = strlen(real_prefix); |
| 767 | if (strncmp(name, real_prefix, real_prefix_length) == 0 |
| 768 | && parameters->options().is_wrap(name + real_prefix_length)) |
| 769 | { |
| 770 | // Turn __real_NAME into NAME. |
| 771 | std::string s; |
| 772 | if (prefix != '\0') |
| 773 | s += prefix; |
| 774 | s += name + real_prefix_length; |
| 775 | return this->namepool_.add(s.c_str(), true, name_key); |
| 776 | } |
| 777 | |
| 778 | return name; |
| 779 | } |
| 780 | |
| 781 | // This is called when we see a symbol NAME/VERSION, and the symbol |
| 782 | // already exists in the symbol table, and VERSION is marked as being |
| 783 | // the default version. SYM is the NAME/VERSION symbol we just added. |
| 784 | // DEFAULT_IS_NEW is true if this is the first time we have seen the |
| 785 | // symbol NAME/NULL. PDEF points to the entry for NAME/NULL. |
| 786 | |
| 787 | template<int size, bool big_endian> |
| 788 | void |
| 789 | Symbol_table::define_default_version(Sized_symbol<size>* sym, |
| 790 | bool default_is_new, |
| 791 | Symbol_table_type::iterator pdef) |
| 792 | { |
| 793 | if (default_is_new) |
| 794 | { |
| 795 | // This is the first time we have seen NAME/NULL. Make |
| 796 | // NAME/NULL point to NAME/VERSION, and mark SYM as the default |
| 797 | // version. |
| 798 | pdef->second = sym; |
| 799 | sym->set_is_default(); |
| 800 | } |
| 801 | else if (pdef->second == sym) |
| 802 | { |
| 803 | // NAME/NULL already points to NAME/VERSION. Don't mark the |
| 804 | // symbol as the default if it is not already the default. |
| 805 | } |
| 806 | else |
| 807 | { |
| 808 | // This is the unfortunate case where we already have entries |
| 809 | // for both NAME/VERSION and NAME/NULL. We now see a symbol |
| 810 | // NAME/VERSION where VERSION is the default version. We have |
| 811 | // already resolved this new symbol with the existing |
| 812 | // NAME/VERSION symbol. |
| 813 | |
| 814 | // It's possible that NAME/NULL and NAME/VERSION are both |
| 815 | // defined in regular objects. This can only happen if one |
| 816 | // object file defines foo and another defines foo@@ver. This |
| 817 | // is somewhat obscure, but we call it a multiple definition |
| 818 | // error. |
| 819 | |
| 820 | // It's possible that NAME/NULL actually has a version, in which |
| 821 | // case it won't be the same as VERSION. This happens with |
| 822 | // ver_test_7.so in the testsuite for the symbol t2_2. We see |
| 823 | // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We |
| 824 | // then see an unadorned t2_2 in an object file and give it |
| 825 | // version VER1 from the version script. This looks like a |
| 826 | // default definition for VER1, so it looks like we should merge |
| 827 | // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's |
| 828 | // not obvious that this is an error, either. So we just punt. |
| 829 | |
| 830 | // If one of the symbols has non-default visibility, and the |
| 831 | // other is defined in a shared object, then they are different |
| 832 | // symbols. |
| 833 | |
| 834 | // Otherwise, we just resolve the symbols as though they were |
| 835 | // the same. |
| 836 | |
| 837 | if (pdef->second->version() != NULL) |
| 838 | gold_assert(pdef->second->version() != sym->version()); |
| 839 | else if (sym->visibility() != elfcpp::STV_DEFAULT |
| 840 | && pdef->second->is_from_dynobj()) |
| 841 | ; |
| 842 | else if (pdef->second->visibility() != elfcpp::STV_DEFAULT |
| 843 | && sym->is_from_dynobj()) |
| 844 | ; |
| 845 | else |
| 846 | { |
| 847 | const Sized_symbol<size>* symdef; |
| 848 | symdef = this->get_sized_symbol<size>(pdef->second); |
| 849 | Symbol_table::resolve<size, big_endian>(sym, symdef); |
| 850 | this->make_forwarder(pdef->second, sym); |
| 851 | pdef->second = sym; |
| 852 | sym->set_is_default(); |
| 853 | } |
| 854 | } |
| 855 | } |
| 856 | |
| 857 | // Add one symbol from OBJECT to the symbol table. NAME is symbol |
| 858 | // name and VERSION is the version; both are canonicalized. DEF is |
| 859 | // whether this is the default version. ST_SHNDX is the symbol's |
| 860 | // section index; IS_ORDINARY is whether this is a normal section |
| 861 | // rather than a special code. |
| 862 | |
| 863 | // If IS_DEFAULT_VERSION is true, then this is the definition of a |
| 864 | // default version of a symbol. That means that any lookup of |
| 865 | // NAME/NULL and any lookup of NAME/VERSION should always return the |
| 866 | // same symbol. This is obvious for references, but in particular we |
| 867 | // want to do this for definitions: overriding NAME/NULL should also |
| 868 | // override NAME/VERSION. If we don't do that, it would be very hard |
| 869 | // to override functions in a shared library which uses versioning. |
| 870 | |
| 871 | // We implement this by simply making both entries in the hash table |
| 872 | // point to the same Symbol structure. That is easy enough if this is |
| 873 | // the first time we see NAME/NULL or NAME/VERSION, but it is possible |
| 874 | // that we have seen both already, in which case they will both have |
| 875 | // independent entries in the symbol table. We can't simply change |
| 876 | // the symbol table entry, because we have pointers to the entries |
| 877 | // attached to the object files. So we mark the entry attached to the |
| 878 | // object file as a forwarder, and record it in the forwarders_ map. |
| 879 | // Note that entries in the hash table will never be marked as |
| 880 | // forwarders. |
| 881 | // |
| 882 | // ORIG_ST_SHNDX and ST_SHNDX are almost always the same. |
| 883 | // ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF |
| 884 | // for a special section code. ST_SHNDX may be modified if the symbol |
| 885 | // is defined in a section being discarded. |
| 886 | |
| 887 | template<int size, bool big_endian> |
| 888 | Sized_symbol<size>* |
| 889 | Symbol_table::add_from_object(Object* object, |
| 890 | const char* name, |
| 891 | Stringpool::Key name_key, |
| 892 | const char* version, |
| 893 | Stringpool::Key version_key, |
| 894 | bool is_default_version, |
| 895 | const elfcpp::Sym<size, big_endian>& sym, |
| 896 | unsigned int st_shndx, |
| 897 | bool is_ordinary, |
| 898 | unsigned int orig_st_shndx) |
| 899 | { |
| 900 | // Print a message if this symbol is being traced. |
| 901 | if (parameters->options().is_trace_symbol(name)) |
| 902 | { |
| 903 | if (orig_st_shndx == elfcpp::SHN_UNDEF) |
| 904 | gold_info(_("%s: reference to %s"), object->name().c_str(), name); |
| 905 | else |
| 906 | gold_info(_("%s: definition of %s"), object->name().c_str(), name); |
| 907 | } |
| 908 | |
| 909 | // For an undefined symbol, we may need to adjust the name using |
| 910 | // --wrap. |
| 911 | if (orig_st_shndx == elfcpp::SHN_UNDEF |
| 912 | && parameters->options().any_wrap()) |
| 913 | { |
| 914 | const char* wrap_name = this->wrap_symbol(name, &name_key); |
| 915 | if (wrap_name != name) |
| 916 | { |
| 917 | // If we see a reference to malloc with version GLIBC_2.0, |
| 918 | // and we turn it into a reference to __wrap_malloc, then we |
| 919 | // discard the version number. Otherwise the user would be |
| 920 | // required to specify the correct version for |
| 921 | // __wrap_malloc. |
| 922 | version = NULL; |
| 923 | version_key = 0; |
| 924 | name = wrap_name; |
| 925 | } |
| 926 | } |
| 927 | |
| 928 | Symbol* const snull = NULL; |
| 929 | std::pair<typename Symbol_table_type::iterator, bool> ins = |
| 930 | this->table_.insert(std::make_pair(std::make_pair(name_key, version_key), |
| 931 | snull)); |
| 932 | |
| 933 | std::pair<typename Symbol_table_type::iterator, bool> insdefault = |
| 934 | std::make_pair(this->table_.end(), false); |
| 935 | if (is_default_version) |
| 936 | { |
| 937 | const Stringpool::Key vnull_key = 0; |
| 938 | insdefault = this->table_.insert(std::make_pair(std::make_pair(name_key, |
| 939 | vnull_key), |
| 940 | snull)); |
| 941 | } |
| 942 | |
| 943 | // ins.first: an iterator, which is a pointer to a pair. |
| 944 | // ins.first->first: the key (a pair of name and version). |
| 945 | // ins.first->second: the value (Symbol*). |
| 946 | // ins.second: true if new entry was inserted, false if not. |
| 947 | |
| 948 | Sized_symbol<size>* ret; |
| 949 | bool was_undefined; |
| 950 | bool was_common; |
| 951 | if (!ins.second) |
| 952 | { |
| 953 | // We already have an entry for NAME/VERSION. |
| 954 | ret = this->get_sized_symbol<size>(ins.first->second); |
| 955 | gold_assert(ret != NULL); |
| 956 | |
| 957 | was_undefined = ret->is_undefined(); |
| 958 | was_common = ret->is_common(); |
| 959 | |
| 960 | this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object, |
| 961 | version); |
| 962 | if (parameters->options().gc_sections()) |
| 963 | this->gc_mark_dyn_syms(ret); |
| 964 | |
| 965 | if (is_default_version) |
| 966 | this->define_default_version<size, big_endian>(ret, insdefault.second, |
| 967 | insdefault.first); |
| 968 | } |
| 969 | else |
| 970 | { |
| 971 | // This is the first time we have seen NAME/VERSION. |
| 972 | gold_assert(ins.first->second == NULL); |
| 973 | |
| 974 | if (is_default_version && !insdefault.second) |
| 975 | { |
| 976 | // We already have an entry for NAME/NULL. If we override |
| 977 | // it, then change it to NAME/VERSION. |
| 978 | ret = this->get_sized_symbol<size>(insdefault.first->second); |
| 979 | |
| 980 | was_undefined = ret->is_undefined(); |
| 981 | was_common = ret->is_common(); |
| 982 | |
| 983 | this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object, |
| 984 | version); |
| 985 | if (parameters->options().gc_sections()) |
| 986 | this->gc_mark_dyn_syms(ret); |
| 987 | ins.first->second = ret; |
| 988 | } |
| 989 | else |
| 990 | { |
| 991 | was_undefined = false; |
| 992 | was_common = false; |
| 993 | |
| 994 | Sized_target<size, big_endian>* target = |
| 995 | parameters->sized_target<size, big_endian>(); |
| 996 | if (!target->has_make_symbol()) |
| 997 | ret = new Sized_symbol<size>(); |
| 998 | else |
| 999 | { |
| 1000 | ret = target->make_symbol(); |
| 1001 | if (ret == NULL) |
| 1002 | { |
| 1003 | // This means that we don't want a symbol table |
| 1004 | // entry after all. |
| 1005 | if (!is_default_version) |
| 1006 | this->table_.erase(ins.first); |
| 1007 | else |
| 1008 | { |
| 1009 | this->table_.erase(insdefault.first); |
| 1010 | // Inserting INSDEFAULT invalidated INS. |
| 1011 | this->table_.erase(std::make_pair(name_key, |
| 1012 | version_key)); |
| 1013 | } |
| 1014 | return NULL; |
| 1015 | } |
| 1016 | } |
| 1017 | |
| 1018 | ret->init_object(name, version, object, sym, st_shndx, is_ordinary); |
| 1019 | |
| 1020 | ins.first->second = ret; |
| 1021 | if (is_default_version) |
| 1022 | { |
| 1023 | // This is the first time we have seen NAME/NULL. Point |
| 1024 | // it at the new entry for NAME/VERSION. |
| 1025 | gold_assert(insdefault.second); |
| 1026 | insdefault.first->second = ret; |
| 1027 | } |
| 1028 | } |
| 1029 | |
| 1030 | if (is_default_version) |
| 1031 | ret->set_is_default(); |
| 1032 | } |
| 1033 | |
| 1034 | // Record every time we see a new undefined symbol, to speed up |
| 1035 | // archive groups. |
| 1036 | if (!was_undefined && ret->is_undefined()) |
| 1037 | { |
| 1038 | ++this->saw_undefined_; |
| 1039 | if (parameters->options().has_plugins()) |
| 1040 | parameters->options().plugins()->new_undefined_symbol(ret); |
| 1041 | } |
| 1042 | |
| 1043 | // Keep track of common symbols, to speed up common symbol |
| 1044 | // allocation. |
| 1045 | if (!was_common && ret->is_common()) |
| 1046 | { |
| 1047 | if (ret->type() == elfcpp::STT_TLS) |
| 1048 | this->tls_commons_.push_back(ret); |
| 1049 | else if (!is_ordinary |
| 1050 | && st_shndx == parameters->target().small_common_shndx()) |
| 1051 | this->small_commons_.push_back(ret); |
| 1052 | else if (!is_ordinary |
| 1053 | && st_shndx == parameters->target().large_common_shndx()) |
| 1054 | this->large_commons_.push_back(ret); |
| 1055 | else |
| 1056 | this->commons_.push_back(ret); |
| 1057 | } |
| 1058 | |
| 1059 | // If we're not doing a relocatable link, then any symbol with |
| 1060 | // hidden or internal visibility is local. |
| 1061 | if ((ret->visibility() == elfcpp::STV_HIDDEN |
| 1062 | || ret->visibility() == elfcpp::STV_INTERNAL) |
| 1063 | && (ret->binding() == elfcpp::STB_GLOBAL |
| 1064 | || ret->binding() == elfcpp::STB_GNU_UNIQUE |
| 1065 | || ret->binding() == elfcpp::STB_WEAK) |
| 1066 | && !parameters->options().relocatable()) |
| 1067 | this->force_local(ret); |
| 1068 | |
| 1069 | return ret; |
| 1070 | } |
| 1071 | |
| 1072 | // Add all the symbols in a relocatable object to the hash table. |
| 1073 | |
| 1074 | template<int size, bool big_endian> |
| 1075 | void |
| 1076 | Symbol_table::add_from_relobj( |
| 1077 | Sized_relobj_file<size, big_endian>* relobj, |
| 1078 | const unsigned char* syms, |
| 1079 | size_t count, |
| 1080 | size_t symndx_offset, |
| 1081 | const char* sym_names, |
| 1082 | size_t sym_name_size, |
| 1083 | typename Sized_relobj_file<size, big_endian>::Symbols* sympointers, |
| 1084 | size_t* defined) |
| 1085 | { |
| 1086 | *defined = 0; |
| 1087 | |
| 1088 | gold_assert(size == parameters->target().get_size()); |
| 1089 | |
| 1090 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
| 1091 | |
| 1092 | const bool just_symbols = relobj->just_symbols(); |
| 1093 | |
| 1094 | const unsigned char* p = syms; |
| 1095 | for (size_t i = 0; i < count; ++i, p += sym_size) |
| 1096 | { |
| 1097 | (*sympointers)[i] = NULL; |
| 1098 | |
| 1099 | elfcpp::Sym<size, big_endian> sym(p); |
| 1100 | |
| 1101 | unsigned int st_name = sym.get_st_name(); |
| 1102 | if (st_name >= sym_name_size) |
| 1103 | { |
| 1104 | relobj->error(_("bad global symbol name offset %u at %zu"), |
| 1105 | st_name, i); |
| 1106 | continue; |
| 1107 | } |
| 1108 | |
| 1109 | const char* name = sym_names + st_name; |
| 1110 | |
| 1111 | bool is_ordinary; |
| 1112 | unsigned int st_shndx = relobj->adjust_sym_shndx(i + symndx_offset, |
| 1113 | sym.get_st_shndx(), |
| 1114 | &is_ordinary); |
| 1115 | unsigned int orig_st_shndx = st_shndx; |
| 1116 | if (!is_ordinary) |
| 1117 | orig_st_shndx = elfcpp::SHN_UNDEF; |
| 1118 | |
| 1119 | if (st_shndx != elfcpp::SHN_UNDEF) |
| 1120 | ++*defined; |
| 1121 | |
| 1122 | // A symbol defined in a section which we are not including must |
| 1123 | // be treated as an undefined symbol. |
| 1124 | bool is_defined_in_discarded_section = false; |
| 1125 | if (st_shndx != elfcpp::SHN_UNDEF |
| 1126 | && is_ordinary |
| 1127 | && !relobj->is_section_included(st_shndx) |
| 1128 | && !this->is_section_folded(relobj, st_shndx)) |
| 1129 | { |
| 1130 | st_shndx = elfcpp::SHN_UNDEF; |
| 1131 | is_defined_in_discarded_section = true; |
| 1132 | } |
| 1133 | |
| 1134 | // In an object file, an '@' in the name separates the symbol |
| 1135 | // name from the version name. If there are two '@' characters, |
| 1136 | // this is the default version. |
| 1137 | const char* ver = strchr(name, '@'); |
| 1138 | Stringpool::Key ver_key = 0; |
| 1139 | int namelen = 0; |
| 1140 | // IS_DEFAULT_VERSION: is the version default? |
| 1141 | // IS_FORCED_LOCAL: is the symbol forced local? |
| 1142 | bool is_default_version = false; |
| 1143 | bool is_forced_local = false; |
| 1144 | |
| 1145 | // FIXME: For incremental links, we don't store version information, |
| 1146 | // so we need to ignore version symbols for now. |
| 1147 | if (parameters->incremental_update() && ver != NULL) |
| 1148 | { |
| 1149 | namelen = ver - name; |
| 1150 | ver = NULL; |
| 1151 | } |
| 1152 | |
| 1153 | if (ver != NULL) |
| 1154 | { |
| 1155 | // The symbol name is of the form foo@VERSION or foo@@VERSION |
| 1156 | namelen = ver - name; |
| 1157 | ++ver; |
| 1158 | if (*ver == '@') |
| 1159 | { |
| 1160 | is_default_version = true; |
| 1161 | ++ver; |
| 1162 | } |
| 1163 | ver = this->namepool_.add(ver, true, &ver_key); |
| 1164 | } |
| 1165 | // We don't want to assign a version to an undefined symbol, |
| 1166 | // even if it is listed in the version script. FIXME: What |
| 1167 | // about a common symbol? |
| 1168 | else |
| 1169 | { |
| 1170 | namelen = strlen(name); |
| 1171 | if (!this->version_script_.empty() |
| 1172 | && st_shndx != elfcpp::SHN_UNDEF) |
| 1173 | { |
| 1174 | // The symbol name did not have a version, but the |
| 1175 | // version script may assign a version anyway. |
| 1176 | std::string version; |
| 1177 | bool is_global; |
| 1178 | if (this->version_script_.get_symbol_version(name, &version, |
| 1179 | &is_global)) |
| 1180 | { |
| 1181 | if (!is_global) |
| 1182 | is_forced_local = true; |
| 1183 | else if (!version.empty()) |
| 1184 | { |
| 1185 | ver = this->namepool_.add_with_length(version.c_str(), |
| 1186 | version.length(), |
| 1187 | true, |
| 1188 | &ver_key); |
| 1189 | is_default_version = true; |
| 1190 | } |
| 1191 | } |
| 1192 | } |
| 1193 | } |
| 1194 | |
| 1195 | elfcpp::Sym<size, big_endian>* psym = &sym; |
| 1196 | unsigned char symbuf[sym_size]; |
| 1197 | elfcpp::Sym<size, big_endian> sym2(symbuf); |
| 1198 | if (just_symbols) |
| 1199 | { |
| 1200 | memcpy(symbuf, p, sym_size); |
| 1201 | elfcpp::Sym_write<size, big_endian> sw(symbuf); |
| 1202 | if (orig_st_shndx != elfcpp::SHN_UNDEF |
| 1203 | && is_ordinary |
| 1204 | && relobj->e_type() == elfcpp::ET_REL) |
| 1205 | { |
| 1206 | // Symbol values in relocatable object files are section |
| 1207 | // relative. This is normally what we want, but since here |
| 1208 | // we are converting the symbol to absolute we need to add |
| 1209 | // the section address. The section address in an object |
| 1210 | // file is normally zero, but people can use a linker |
| 1211 | // script to change it. |
| 1212 | sw.put_st_value(sym.get_st_value() |
| 1213 | + relobj->section_address(orig_st_shndx)); |
| 1214 | } |
| 1215 | st_shndx = elfcpp::SHN_ABS; |
| 1216 | is_ordinary = false; |
| 1217 | psym = &sym2; |
| 1218 | } |
| 1219 | |
| 1220 | // Fix up visibility if object has no-export set. |
| 1221 | if (relobj->no_export() |
| 1222 | && (orig_st_shndx != elfcpp::SHN_UNDEF || !is_ordinary)) |
| 1223 | { |
| 1224 | // We may have copied symbol already above. |
| 1225 | if (psym != &sym2) |
| 1226 | { |
| 1227 | memcpy(symbuf, p, sym_size); |
| 1228 | psym = &sym2; |
| 1229 | } |
| 1230 | |
| 1231 | elfcpp::STV visibility = sym2.get_st_visibility(); |
| 1232 | if (visibility == elfcpp::STV_DEFAULT |
| 1233 | || visibility == elfcpp::STV_PROTECTED) |
| 1234 | { |
| 1235 | elfcpp::Sym_write<size, big_endian> sw(symbuf); |
| 1236 | unsigned char nonvis = sym2.get_st_nonvis(); |
| 1237 | sw.put_st_other(elfcpp::STV_HIDDEN, nonvis); |
| 1238 | } |
| 1239 | } |
| 1240 | |
| 1241 | Stringpool::Key name_key; |
| 1242 | name = this->namepool_.add_with_length(name, namelen, true, |
| 1243 | &name_key); |
| 1244 | |
| 1245 | Sized_symbol<size>* res; |
| 1246 | res = this->add_from_object(relobj, name, name_key, ver, ver_key, |
| 1247 | is_default_version, *psym, st_shndx, |
| 1248 | is_ordinary, orig_st_shndx); |
| 1249 | |
| 1250 | if (is_forced_local) |
| 1251 | this->force_local(res); |
| 1252 | |
| 1253 | // Do not treat this symbol as garbage if this symbol will be |
| 1254 | // exported to the dynamic symbol table. This is true when |
| 1255 | // building a shared library or using --export-dynamic and |
| 1256 | // the symbol is externally visible. |
| 1257 | if (parameters->options().gc_sections() |
| 1258 | && res->is_externally_visible() |
| 1259 | && !res->is_from_dynobj() |
| 1260 | && (parameters->options().shared() |
| 1261 | || parameters->options().export_dynamic())) |
| 1262 | this->gc_mark_symbol(res); |
| 1263 | |
| 1264 | if (is_defined_in_discarded_section) |
| 1265 | res->set_is_defined_in_discarded_section(); |
| 1266 | |
| 1267 | (*sympointers)[i] = res; |
| 1268 | } |
| 1269 | } |
| 1270 | |
| 1271 | // Add a symbol from a plugin-claimed file. |
| 1272 | |
| 1273 | template<int size, bool big_endian> |
| 1274 | Symbol* |
| 1275 | Symbol_table::add_from_pluginobj( |
| 1276 | Sized_pluginobj<size, big_endian>* obj, |
| 1277 | const char* name, |
| 1278 | const char* ver, |
| 1279 | elfcpp::Sym<size, big_endian>* sym) |
| 1280 | { |
| 1281 | unsigned int st_shndx = sym->get_st_shndx(); |
| 1282 | bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE; |
| 1283 | |
| 1284 | Stringpool::Key ver_key = 0; |
| 1285 | bool is_default_version = false; |
| 1286 | bool is_forced_local = false; |
| 1287 | |
| 1288 | if (ver != NULL) |
| 1289 | { |
| 1290 | ver = this->namepool_.add(ver, true, &ver_key); |
| 1291 | } |
| 1292 | // We don't want to assign a version to an undefined symbol, |
| 1293 | // even if it is listed in the version script. FIXME: What |
| 1294 | // about a common symbol? |
| 1295 | else |
| 1296 | { |
| 1297 | if (!this->version_script_.empty() |
| 1298 | && st_shndx != elfcpp::SHN_UNDEF) |
| 1299 | { |
| 1300 | // The symbol name did not have a version, but the |
| 1301 | // version script may assign a version anyway. |
| 1302 | std::string version; |
| 1303 | bool is_global; |
| 1304 | if (this->version_script_.get_symbol_version(name, &version, |
| 1305 | &is_global)) |
| 1306 | { |
| 1307 | if (!is_global) |
| 1308 | is_forced_local = true; |
| 1309 | else if (!version.empty()) |
| 1310 | { |
| 1311 | ver = this->namepool_.add_with_length(version.c_str(), |
| 1312 | version.length(), |
| 1313 | true, |
| 1314 | &ver_key); |
| 1315 | is_default_version = true; |
| 1316 | } |
| 1317 | } |
| 1318 | } |
| 1319 | } |
| 1320 | |
| 1321 | Stringpool::Key name_key; |
| 1322 | name = this->namepool_.add(name, true, &name_key); |
| 1323 | |
| 1324 | Sized_symbol<size>* res; |
| 1325 | res = this->add_from_object(obj, name, name_key, ver, ver_key, |
| 1326 | is_default_version, *sym, st_shndx, |
| 1327 | is_ordinary, st_shndx); |
| 1328 | |
| 1329 | if (is_forced_local) |
| 1330 | this->force_local(res); |
| 1331 | |
| 1332 | return res; |
| 1333 | } |
| 1334 | |
| 1335 | // Add all the symbols in a dynamic object to the hash table. |
| 1336 | |
| 1337 | template<int size, bool big_endian> |
| 1338 | void |
| 1339 | Symbol_table::add_from_dynobj( |
| 1340 | Sized_dynobj<size, big_endian>* dynobj, |
| 1341 | const unsigned char* syms, |
| 1342 | size_t count, |
| 1343 | const char* sym_names, |
| 1344 | size_t sym_name_size, |
| 1345 | const unsigned char* versym, |
| 1346 | size_t versym_size, |
| 1347 | const std::vector<const char*>* version_map, |
| 1348 | typename Sized_relobj_file<size, big_endian>::Symbols* sympointers, |
| 1349 | size_t* defined) |
| 1350 | { |
| 1351 | *defined = 0; |
| 1352 | |
| 1353 | gold_assert(size == parameters->target().get_size()); |
| 1354 | |
| 1355 | if (dynobj->just_symbols()) |
| 1356 | { |
| 1357 | gold_error(_("--just-symbols does not make sense with a shared object")); |
| 1358 | return; |
| 1359 | } |
| 1360 | |
| 1361 | // FIXME: For incremental links, we don't store version information, |
| 1362 | // so we need to ignore version symbols for now. |
| 1363 | if (parameters->incremental_update()) |
| 1364 | versym = NULL; |
| 1365 | |
| 1366 | if (versym != NULL && versym_size / 2 < count) |
| 1367 | { |
| 1368 | dynobj->error(_("too few symbol versions")); |
| 1369 | return; |
| 1370 | } |
| 1371 | |
| 1372 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
| 1373 | |
| 1374 | // We keep a list of all STT_OBJECT symbols, so that we can resolve |
| 1375 | // weak aliases. This is necessary because if the dynamic object |
| 1376 | // provides the same variable under two names, one of which is a |
| 1377 | // weak definition, and the regular object refers to the weak |
| 1378 | // definition, we have to put both the weak definition and the |
| 1379 | // strong definition into the dynamic symbol table. Given a weak |
| 1380 | // definition, the only way that we can find the corresponding |
| 1381 | // strong definition, if any, is to search the symbol table. |
| 1382 | std::vector<Sized_symbol<size>*> object_symbols; |
| 1383 | |
| 1384 | const unsigned char* p = syms; |
| 1385 | const unsigned char* vs = versym; |
| 1386 | for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2) |
| 1387 | { |
| 1388 | elfcpp::Sym<size, big_endian> sym(p); |
| 1389 | |
| 1390 | if (sympointers != NULL) |
| 1391 | (*sympointers)[i] = NULL; |
| 1392 | |
| 1393 | // Ignore symbols with local binding or that have |
| 1394 | // internal or hidden visibility. |
| 1395 | if (sym.get_st_bind() == elfcpp::STB_LOCAL |
| 1396 | || sym.get_st_visibility() == elfcpp::STV_INTERNAL |
| 1397 | || sym.get_st_visibility() == elfcpp::STV_HIDDEN) |
| 1398 | continue; |
| 1399 | |
| 1400 | // A protected symbol in a shared library must be treated as a |
| 1401 | // normal symbol when viewed from outside the shared library. |
| 1402 | // Implement this by overriding the visibility here. |
| 1403 | elfcpp::Sym<size, big_endian>* psym = &sym; |
| 1404 | unsigned char symbuf[sym_size]; |
| 1405 | elfcpp::Sym<size, big_endian> sym2(symbuf); |
| 1406 | if (sym.get_st_visibility() == elfcpp::STV_PROTECTED) |
| 1407 | { |
| 1408 | memcpy(symbuf, p, sym_size); |
| 1409 | elfcpp::Sym_write<size, big_endian> sw(symbuf); |
| 1410 | sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis()); |
| 1411 | psym = &sym2; |
| 1412 | } |
| 1413 | |
| 1414 | unsigned int st_name = psym->get_st_name(); |
| 1415 | if (st_name >= sym_name_size) |
| 1416 | { |
| 1417 | dynobj->error(_("bad symbol name offset %u at %zu"), |
| 1418 | st_name, i); |
| 1419 | continue; |
| 1420 | } |
| 1421 | |
| 1422 | const char* name = sym_names + st_name; |
| 1423 | |
| 1424 | bool is_ordinary; |
| 1425 | unsigned int st_shndx = dynobj->adjust_sym_shndx(i, psym->get_st_shndx(), |
| 1426 | &is_ordinary); |
| 1427 | |
| 1428 | if (st_shndx != elfcpp::SHN_UNDEF) |
| 1429 | ++*defined; |
| 1430 | |
| 1431 | Sized_symbol<size>* res; |
| 1432 | |
| 1433 | if (versym == NULL) |
| 1434 | { |
| 1435 | Stringpool::Key name_key; |
| 1436 | name = this->namepool_.add(name, true, &name_key); |
| 1437 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, |
| 1438 | false, *psym, st_shndx, is_ordinary, |
| 1439 | st_shndx); |
| 1440 | } |
| 1441 | else |
| 1442 | { |
| 1443 | // Read the version information. |
| 1444 | |
| 1445 | unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs); |
| 1446 | |
| 1447 | bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0; |
| 1448 | v &= elfcpp::VERSYM_VERSION; |
| 1449 | |
| 1450 | // The Sun documentation says that V can be VER_NDX_LOCAL, |
| 1451 | // or VER_NDX_GLOBAL, or a version index. The meaning of |
| 1452 | // VER_NDX_LOCAL is defined as "Symbol has local scope." |
| 1453 | // The old GNU linker will happily generate VER_NDX_LOCAL |
| 1454 | // for an undefined symbol. I don't know what the Sun |
| 1455 | // linker will generate. |
| 1456 | |
| 1457 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
| 1458 | && st_shndx != elfcpp::SHN_UNDEF) |
| 1459 | { |
| 1460 | // This symbol should not be visible outside the object. |
| 1461 | continue; |
| 1462 | } |
| 1463 | |
| 1464 | // At this point we are definitely going to add this symbol. |
| 1465 | Stringpool::Key name_key; |
| 1466 | name = this->namepool_.add(name, true, &name_key); |
| 1467 | |
| 1468 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
| 1469 | || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL)) |
| 1470 | { |
| 1471 | // This symbol does not have a version. |
| 1472 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, |
| 1473 | false, *psym, st_shndx, is_ordinary, |
| 1474 | st_shndx); |
| 1475 | } |
| 1476 | else |
| 1477 | { |
| 1478 | if (v >= version_map->size()) |
| 1479 | { |
| 1480 | dynobj->error(_("versym for symbol %zu out of range: %u"), |
| 1481 | i, v); |
| 1482 | continue; |
| 1483 | } |
| 1484 | |
| 1485 | const char* version = (*version_map)[v]; |
| 1486 | if (version == NULL) |
| 1487 | { |
| 1488 | dynobj->error(_("versym for symbol %zu has no name: %u"), |
| 1489 | i, v); |
| 1490 | continue; |
| 1491 | } |
| 1492 | |
| 1493 | Stringpool::Key version_key; |
| 1494 | version = this->namepool_.add(version, true, &version_key); |
| 1495 | |
| 1496 | // If this is an absolute symbol, and the version name |
| 1497 | // and symbol name are the same, then this is the |
| 1498 | // version definition symbol. These symbols exist to |
| 1499 | // support using -u to pull in particular versions. We |
| 1500 | // do not want to record a version for them. |
| 1501 | if (st_shndx == elfcpp::SHN_ABS |
| 1502 | && !is_ordinary |
| 1503 | && name_key == version_key) |
| 1504 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, |
| 1505 | false, *psym, st_shndx, is_ordinary, |
| 1506 | st_shndx); |
| 1507 | else |
| 1508 | { |
| 1509 | const bool is_default_version = |
| 1510 | !hidden && st_shndx != elfcpp::SHN_UNDEF; |
| 1511 | res = this->add_from_object(dynobj, name, name_key, version, |
| 1512 | version_key, is_default_version, |
| 1513 | *psym, st_shndx, |
| 1514 | is_ordinary, st_shndx); |
| 1515 | } |
| 1516 | } |
| 1517 | } |
| 1518 | |
| 1519 | // Note that it is possible that RES was overridden by an |
| 1520 | // earlier object, in which case it can't be aliased here. |
| 1521 | if (st_shndx != elfcpp::SHN_UNDEF |
| 1522 | && is_ordinary |
| 1523 | && psym->get_st_type() == elfcpp::STT_OBJECT |
| 1524 | && res->source() == Symbol::FROM_OBJECT |
| 1525 | && res->object() == dynobj) |
| 1526 | object_symbols.push_back(res); |
| 1527 | |
| 1528 | if (sympointers != NULL) |
| 1529 | (*sympointers)[i] = res; |
| 1530 | } |
| 1531 | |
| 1532 | this->record_weak_aliases(&object_symbols); |
| 1533 | } |
| 1534 | |
| 1535 | // Add a symbol from a incremental object file. |
| 1536 | |
| 1537 | template<int size, bool big_endian> |
| 1538 | Sized_symbol<size>* |
| 1539 | Symbol_table::add_from_incrobj( |
| 1540 | Object* obj, |
| 1541 | const char* name, |
| 1542 | const char* ver, |
| 1543 | elfcpp::Sym<size, big_endian>* sym) |
| 1544 | { |
| 1545 | unsigned int st_shndx = sym->get_st_shndx(); |
| 1546 | bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE; |
| 1547 | |
| 1548 | Stringpool::Key ver_key = 0; |
| 1549 | bool is_default_version = false; |
| 1550 | bool is_forced_local = false; |
| 1551 | |
| 1552 | Stringpool::Key name_key; |
| 1553 | name = this->namepool_.add(name, true, &name_key); |
| 1554 | |
| 1555 | Sized_symbol<size>* res; |
| 1556 | res = this->add_from_object(obj, name, name_key, ver, ver_key, |
| 1557 | is_default_version, *sym, st_shndx, |
| 1558 | is_ordinary, st_shndx); |
| 1559 | |
| 1560 | if (is_forced_local) |
| 1561 | this->force_local(res); |
| 1562 | |
| 1563 | return res; |
| 1564 | } |
| 1565 | |
| 1566 | // This is used to sort weak aliases. We sort them first by section |
| 1567 | // index, then by offset, then by weak ahead of strong. |
| 1568 | |
| 1569 | template<int size> |
| 1570 | class Weak_alias_sorter |
| 1571 | { |
| 1572 | public: |
| 1573 | bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const; |
| 1574 | }; |
| 1575 | |
| 1576 | template<int size> |
| 1577 | bool |
| 1578 | Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1, |
| 1579 | const Sized_symbol<size>* s2) const |
| 1580 | { |
| 1581 | bool is_ordinary; |
| 1582 | unsigned int s1_shndx = s1->shndx(&is_ordinary); |
| 1583 | gold_assert(is_ordinary); |
| 1584 | unsigned int s2_shndx = s2->shndx(&is_ordinary); |
| 1585 | gold_assert(is_ordinary); |
| 1586 | if (s1_shndx != s2_shndx) |
| 1587 | return s1_shndx < s2_shndx; |
| 1588 | |
| 1589 | if (s1->value() != s2->value()) |
| 1590 | return s1->value() < s2->value(); |
| 1591 | if (s1->binding() != s2->binding()) |
| 1592 | { |
| 1593 | if (s1->binding() == elfcpp::STB_WEAK) |
| 1594 | return true; |
| 1595 | if (s2->binding() == elfcpp::STB_WEAK) |
| 1596 | return false; |
| 1597 | } |
| 1598 | return std::string(s1->name()) < std::string(s2->name()); |
| 1599 | } |
| 1600 | |
| 1601 | // SYMBOLS is a list of object symbols from a dynamic object. Look |
| 1602 | // for any weak aliases, and record them so that if we add the weak |
| 1603 | // alias to the dynamic symbol table, we also add the corresponding |
| 1604 | // strong symbol. |
| 1605 | |
| 1606 | template<int size> |
| 1607 | void |
| 1608 | Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols) |
| 1609 | { |
| 1610 | // Sort the vector by section index, then by offset, then by weak |
| 1611 | // ahead of strong. |
| 1612 | std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>()); |
| 1613 | |
| 1614 | // Walk through the vector. For each weak definition, record |
| 1615 | // aliases. |
| 1616 | for (typename std::vector<Sized_symbol<size>*>::const_iterator p = |
| 1617 | symbols->begin(); |
| 1618 | p != symbols->end(); |
| 1619 | ++p) |
| 1620 | { |
| 1621 | if ((*p)->binding() != elfcpp::STB_WEAK) |
| 1622 | continue; |
| 1623 | |
| 1624 | // Build a circular list of weak aliases. Each symbol points to |
| 1625 | // the next one in the circular list. |
| 1626 | |
| 1627 | Sized_symbol<size>* from_sym = *p; |
| 1628 | typename std::vector<Sized_symbol<size>*>::const_iterator q; |
| 1629 | for (q = p + 1; q != symbols->end(); ++q) |
| 1630 | { |
| 1631 | bool dummy; |
| 1632 | if ((*q)->shndx(&dummy) != from_sym->shndx(&dummy) |
| 1633 | || (*q)->value() != from_sym->value()) |
| 1634 | break; |
| 1635 | |
| 1636 | this->weak_aliases_[from_sym] = *q; |
| 1637 | from_sym->set_has_alias(); |
| 1638 | from_sym = *q; |
| 1639 | } |
| 1640 | |
| 1641 | if (from_sym != *p) |
| 1642 | { |
| 1643 | this->weak_aliases_[from_sym] = *p; |
| 1644 | from_sym->set_has_alias(); |
| 1645 | } |
| 1646 | |
| 1647 | p = q - 1; |
| 1648 | } |
| 1649 | } |
| 1650 | |
| 1651 | // Create and return a specially defined symbol. If ONLY_IF_REF is |
| 1652 | // true, then only create the symbol if there is a reference to it. |
| 1653 | // If this does not return NULL, it sets *POLDSYM to the existing |
| 1654 | // symbol if there is one. This sets *RESOLVE_OLDSYM if we should |
| 1655 | // resolve the newly created symbol to the old one. This |
| 1656 | // canonicalizes *PNAME and *PVERSION. |
| 1657 | |
| 1658 | template<int size, bool big_endian> |
| 1659 | Sized_symbol<size>* |
| 1660 | Symbol_table::define_special_symbol(const char** pname, const char** pversion, |
| 1661 | bool only_if_ref, |
| 1662 | Sized_symbol<size>** poldsym, |
| 1663 | bool* resolve_oldsym) |
| 1664 | { |
| 1665 | *resolve_oldsym = false; |
| 1666 | *poldsym = NULL; |
| 1667 | |
| 1668 | // If the caller didn't give us a version, see if we get one from |
| 1669 | // the version script. |
| 1670 | std::string v; |
| 1671 | bool is_default_version = false; |
| 1672 | if (*pversion == NULL) |
| 1673 | { |
| 1674 | bool is_global; |
| 1675 | if (this->version_script_.get_symbol_version(*pname, &v, &is_global)) |
| 1676 | { |
| 1677 | if (is_global && !v.empty()) |
| 1678 | { |
| 1679 | *pversion = v.c_str(); |
| 1680 | // If we get the version from a version script, then we |
| 1681 | // are also the default version. |
| 1682 | is_default_version = true; |
| 1683 | } |
| 1684 | } |
| 1685 | } |
| 1686 | |
| 1687 | Symbol* oldsym; |
| 1688 | Sized_symbol<size>* sym; |
| 1689 | |
| 1690 | bool add_to_table = false; |
| 1691 | typename Symbol_table_type::iterator add_loc = this->table_.end(); |
| 1692 | bool add_def_to_table = false; |
| 1693 | typename Symbol_table_type::iterator add_def_loc = this->table_.end(); |
| 1694 | |
| 1695 | if (only_if_ref) |
| 1696 | { |
| 1697 | oldsym = this->lookup(*pname, *pversion); |
| 1698 | if (oldsym == NULL && is_default_version) |
| 1699 | oldsym = this->lookup(*pname, NULL); |
| 1700 | if (oldsym == NULL || !oldsym->is_undefined()) |
| 1701 | return NULL; |
| 1702 | |
| 1703 | *pname = oldsym->name(); |
| 1704 | if (is_default_version) |
| 1705 | *pversion = this->namepool_.add(*pversion, true, NULL); |
| 1706 | else |
| 1707 | *pversion = oldsym->version(); |
| 1708 | } |
| 1709 | else |
| 1710 | { |
| 1711 | // Canonicalize NAME and VERSION. |
| 1712 | Stringpool::Key name_key; |
| 1713 | *pname = this->namepool_.add(*pname, true, &name_key); |
| 1714 | |
| 1715 | Stringpool::Key version_key = 0; |
| 1716 | if (*pversion != NULL) |
| 1717 | *pversion = this->namepool_.add(*pversion, true, &version_key); |
| 1718 | |
| 1719 | Symbol* const snull = NULL; |
| 1720 | std::pair<typename Symbol_table_type::iterator, bool> ins = |
| 1721 | this->table_.insert(std::make_pair(std::make_pair(name_key, |
| 1722 | version_key), |
| 1723 | snull)); |
| 1724 | |
| 1725 | std::pair<typename Symbol_table_type::iterator, bool> insdefault = |
| 1726 | std::make_pair(this->table_.end(), false); |
| 1727 | if (is_default_version) |
| 1728 | { |
| 1729 | const Stringpool::Key vnull = 0; |
| 1730 | insdefault = |
| 1731 | this->table_.insert(std::make_pair(std::make_pair(name_key, |
| 1732 | vnull), |
| 1733 | snull)); |
| 1734 | } |
| 1735 | |
| 1736 | if (!ins.second) |
| 1737 | { |
| 1738 | // We already have a symbol table entry for NAME/VERSION. |
| 1739 | oldsym = ins.first->second; |
| 1740 | gold_assert(oldsym != NULL); |
| 1741 | |
| 1742 | if (is_default_version) |
| 1743 | { |
| 1744 | Sized_symbol<size>* soldsym = |
| 1745 | this->get_sized_symbol<size>(oldsym); |
| 1746 | this->define_default_version<size, big_endian>(soldsym, |
| 1747 | insdefault.second, |
| 1748 | insdefault.first); |
| 1749 | } |
| 1750 | } |
| 1751 | else |
| 1752 | { |
| 1753 | // We haven't seen this symbol before. |
| 1754 | gold_assert(ins.first->second == NULL); |
| 1755 | |
| 1756 | add_to_table = true; |
| 1757 | add_loc = ins.first; |
| 1758 | |
| 1759 | if (is_default_version && !insdefault.second) |
| 1760 | { |
| 1761 | // We are adding NAME/VERSION, and it is the default |
| 1762 | // version. We already have an entry for NAME/NULL. |
| 1763 | oldsym = insdefault.first->second; |
| 1764 | *resolve_oldsym = true; |
| 1765 | } |
| 1766 | else |
| 1767 | { |
| 1768 | oldsym = NULL; |
| 1769 | |
| 1770 | if (is_default_version) |
| 1771 | { |
| 1772 | add_def_to_table = true; |
| 1773 | add_def_loc = insdefault.first; |
| 1774 | } |
| 1775 | } |
| 1776 | } |
| 1777 | } |
| 1778 | |
| 1779 | const Target& target = parameters->target(); |
| 1780 | if (!target.has_make_symbol()) |
| 1781 | sym = new Sized_symbol<size>(); |
| 1782 | else |
| 1783 | { |
| 1784 | Sized_target<size, big_endian>* sized_target = |
| 1785 | parameters->sized_target<size, big_endian>(); |
| 1786 | sym = sized_target->make_symbol(); |
| 1787 | if (sym == NULL) |
| 1788 | return NULL; |
| 1789 | } |
| 1790 | |
| 1791 | if (add_to_table) |
| 1792 | add_loc->second = sym; |
| 1793 | else |
| 1794 | gold_assert(oldsym != NULL); |
| 1795 | |
| 1796 | if (add_def_to_table) |
| 1797 | add_def_loc->second = sym; |
| 1798 | |
| 1799 | *poldsym = this->get_sized_symbol<size>(oldsym); |
| 1800 | |
| 1801 | return sym; |
| 1802 | } |
| 1803 | |
| 1804 | // Define a symbol based on an Output_data. |
| 1805 | |
| 1806 | Symbol* |
| 1807 | Symbol_table::define_in_output_data(const char* name, |
| 1808 | const char* version, |
| 1809 | Defined defined, |
| 1810 | Output_data* od, |
| 1811 | uint64_t value, |
| 1812 | uint64_t symsize, |
| 1813 | elfcpp::STT type, |
| 1814 | elfcpp::STB binding, |
| 1815 | elfcpp::STV visibility, |
| 1816 | unsigned char nonvis, |
| 1817 | bool offset_is_from_end, |
| 1818 | bool only_if_ref) |
| 1819 | { |
| 1820 | if (parameters->target().get_size() == 32) |
| 1821 | { |
| 1822 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
| 1823 | return this->do_define_in_output_data<32>(name, version, defined, od, |
| 1824 | value, symsize, type, binding, |
| 1825 | visibility, nonvis, |
| 1826 | offset_is_from_end, |
| 1827 | only_if_ref); |
| 1828 | #else |
| 1829 | gold_unreachable(); |
| 1830 | #endif |
| 1831 | } |
| 1832 | else if (parameters->target().get_size() == 64) |
| 1833 | { |
| 1834 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) |
| 1835 | return this->do_define_in_output_data<64>(name, version, defined, od, |
| 1836 | value, symsize, type, binding, |
| 1837 | visibility, nonvis, |
| 1838 | offset_is_from_end, |
| 1839 | only_if_ref); |
| 1840 | #else |
| 1841 | gold_unreachable(); |
| 1842 | #endif |
| 1843 | } |
| 1844 | else |
| 1845 | gold_unreachable(); |
| 1846 | } |
| 1847 | |
| 1848 | // Define a symbol in an Output_data, sized version. |
| 1849 | |
| 1850 | template<int size> |
| 1851 | Sized_symbol<size>* |
| 1852 | Symbol_table::do_define_in_output_data( |
| 1853 | const char* name, |
| 1854 | const char* version, |
| 1855 | Defined defined, |
| 1856 | Output_data* od, |
| 1857 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
| 1858 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, |
| 1859 | elfcpp::STT type, |
| 1860 | elfcpp::STB binding, |
| 1861 | elfcpp::STV visibility, |
| 1862 | unsigned char nonvis, |
| 1863 | bool offset_is_from_end, |
| 1864 | bool only_if_ref) |
| 1865 | { |
| 1866 | Sized_symbol<size>* sym; |
| 1867 | Sized_symbol<size>* oldsym; |
| 1868 | bool resolve_oldsym; |
| 1869 | |
| 1870 | if (parameters->target().is_big_endian()) |
| 1871 | { |
| 1872 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) |
| 1873 | sym = this->define_special_symbol<size, true>(&name, &version, |
| 1874 | only_if_ref, &oldsym, |
| 1875 | &resolve_oldsym); |
| 1876 | #else |
| 1877 | gold_unreachable(); |
| 1878 | #endif |
| 1879 | } |
| 1880 | else |
| 1881 | { |
| 1882 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) |
| 1883 | sym = this->define_special_symbol<size, false>(&name, &version, |
| 1884 | only_if_ref, &oldsym, |
| 1885 | &resolve_oldsym); |
| 1886 | #else |
| 1887 | gold_unreachable(); |
| 1888 | #endif |
| 1889 | } |
| 1890 | |
| 1891 | if (sym == NULL) |
| 1892 | return NULL; |
| 1893 | |
| 1894 | sym->init_output_data(name, version, od, value, symsize, type, binding, |
| 1895 | visibility, nonvis, offset_is_from_end, |
| 1896 | defined == PREDEFINED); |
| 1897 | |
| 1898 | if (oldsym == NULL) |
| 1899 | { |
| 1900 | if (binding == elfcpp::STB_LOCAL |
| 1901 | || this->version_script_.symbol_is_local(name)) |
| 1902 | this->force_local(sym); |
| 1903 | else if (version != NULL) |
| 1904 | sym->set_is_default(); |
| 1905 | return sym; |
| 1906 | } |
| 1907 | |
| 1908 | if (Symbol_table::should_override_with_special(oldsym, type, defined)) |
| 1909 | this->override_with_special(oldsym, sym); |
| 1910 | |
| 1911 | if (resolve_oldsym) |
| 1912 | return sym; |
| 1913 | else |
| 1914 | { |
| 1915 | delete sym; |
| 1916 | return oldsym; |
| 1917 | } |
| 1918 | } |
| 1919 | |
| 1920 | // Define a symbol based on an Output_segment. |
| 1921 | |
| 1922 | Symbol* |
| 1923 | Symbol_table::define_in_output_segment(const char* name, |
| 1924 | const char* version, |
| 1925 | Defined defined, |
| 1926 | Output_segment* os, |
| 1927 | uint64_t value, |
| 1928 | uint64_t symsize, |
| 1929 | elfcpp::STT type, |
| 1930 | elfcpp::STB binding, |
| 1931 | elfcpp::STV visibility, |
| 1932 | unsigned char nonvis, |
| 1933 | Symbol::Segment_offset_base offset_base, |
| 1934 | bool only_if_ref) |
| 1935 | { |
| 1936 | if (parameters->target().get_size() == 32) |
| 1937 | { |
| 1938 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
| 1939 | return this->do_define_in_output_segment<32>(name, version, defined, os, |
| 1940 | value, symsize, type, |
| 1941 | binding, visibility, nonvis, |
| 1942 | offset_base, only_if_ref); |
| 1943 | #else |
| 1944 | gold_unreachable(); |
| 1945 | #endif |
| 1946 | } |
| 1947 | else if (parameters->target().get_size() == 64) |
| 1948 | { |
| 1949 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) |
| 1950 | return this->do_define_in_output_segment<64>(name, version, defined, os, |
| 1951 | value, symsize, type, |
| 1952 | binding, visibility, nonvis, |
| 1953 | offset_base, only_if_ref); |
| 1954 | #else |
| 1955 | gold_unreachable(); |
| 1956 | #endif |
| 1957 | } |
| 1958 | else |
| 1959 | gold_unreachable(); |
| 1960 | } |
| 1961 | |
| 1962 | // Define a symbol in an Output_segment, sized version. |
| 1963 | |
| 1964 | template<int size> |
| 1965 | Sized_symbol<size>* |
| 1966 | Symbol_table::do_define_in_output_segment( |
| 1967 | const char* name, |
| 1968 | const char* version, |
| 1969 | Defined defined, |
| 1970 | Output_segment* os, |
| 1971 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
| 1972 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, |
| 1973 | elfcpp::STT type, |
| 1974 | elfcpp::STB binding, |
| 1975 | elfcpp::STV visibility, |
| 1976 | unsigned char nonvis, |
| 1977 | Symbol::Segment_offset_base offset_base, |
| 1978 | bool only_if_ref) |
| 1979 | { |
| 1980 | Sized_symbol<size>* sym; |
| 1981 | Sized_symbol<size>* oldsym; |
| 1982 | bool resolve_oldsym; |
| 1983 | |
| 1984 | if (parameters->target().is_big_endian()) |
| 1985 | { |
| 1986 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) |
| 1987 | sym = this->define_special_symbol<size, true>(&name, &version, |
| 1988 | only_if_ref, &oldsym, |
| 1989 | &resolve_oldsym); |
| 1990 | #else |
| 1991 | gold_unreachable(); |
| 1992 | #endif |
| 1993 | } |
| 1994 | else |
| 1995 | { |
| 1996 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) |
| 1997 | sym = this->define_special_symbol<size, false>(&name, &version, |
| 1998 | only_if_ref, &oldsym, |
| 1999 | &resolve_oldsym); |
| 2000 | #else |
| 2001 | gold_unreachable(); |
| 2002 | #endif |
| 2003 | } |
| 2004 | |
| 2005 | if (sym == NULL) |
| 2006 | return NULL; |
| 2007 | |
| 2008 | sym->init_output_segment(name, version, os, value, symsize, type, binding, |
| 2009 | visibility, nonvis, offset_base, |
| 2010 | defined == PREDEFINED); |
| 2011 | |
| 2012 | if (oldsym == NULL) |
| 2013 | { |
| 2014 | if (binding == elfcpp::STB_LOCAL |
| 2015 | || this->version_script_.symbol_is_local(name)) |
| 2016 | this->force_local(sym); |
| 2017 | else if (version != NULL) |
| 2018 | sym->set_is_default(); |
| 2019 | return sym; |
| 2020 | } |
| 2021 | |
| 2022 | if (Symbol_table::should_override_with_special(oldsym, type, defined)) |
| 2023 | this->override_with_special(oldsym, sym); |
| 2024 | |
| 2025 | if (resolve_oldsym) |
| 2026 | return sym; |
| 2027 | else |
| 2028 | { |
| 2029 | delete sym; |
| 2030 | return oldsym; |
| 2031 | } |
| 2032 | } |
| 2033 | |
| 2034 | // Define a special symbol with a constant value. It is a multiple |
| 2035 | // definition error if this symbol is already defined. |
| 2036 | |
| 2037 | Symbol* |
| 2038 | Symbol_table::define_as_constant(const char* name, |
| 2039 | const char* version, |
| 2040 | Defined defined, |
| 2041 | uint64_t value, |
| 2042 | uint64_t symsize, |
| 2043 | elfcpp::STT type, |
| 2044 | elfcpp::STB binding, |
| 2045 | elfcpp::STV visibility, |
| 2046 | unsigned char nonvis, |
| 2047 | bool only_if_ref, |
| 2048 | bool force_override) |
| 2049 | { |
| 2050 | if (parameters->target().get_size() == 32) |
| 2051 | { |
| 2052 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
| 2053 | return this->do_define_as_constant<32>(name, version, defined, value, |
| 2054 | symsize, type, binding, |
| 2055 | visibility, nonvis, only_if_ref, |
| 2056 | force_override); |
| 2057 | #else |
| 2058 | gold_unreachable(); |
| 2059 | #endif |
| 2060 | } |
| 2061 | else if (parameters->target().get_size() == 64) |
| 2062 | { |
| 2063 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) |
| 2064 | return this->do_define_as_constant<64>(name, version, defined, value, |
| 2065 | symsize, type, binding, |
| 2066 | visibility, nonvis, only_if_ref, |
| 2067 | force_override); |
| 2068 | #else |
| 2069 | gold_unreachable(); |
| 2070 | #endif |
| 2071 | } |
| 2072 | else |
| 2073 | gold_unreachable(); |
| 2074 | } |
| 2075 | |
| 2076 | // Define a symbol as a constant, sized version. |
| 2077 | |
| 2078 | template<int size> |
| 2079 | Sized_symbol<size>* |
| 2080 | Symbol_table::do_define_as_constant( |
| 2081 | const char* name, |
| 2082 | const char* version, |
| 2083 | Defined defined, |
| 2084 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
| 2085 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, |
| 2086 | elfcpp::STT type, |
| 2087 | elfcpp::STB binding, |
| 2088 | elfcpp::STV visibility, |
| 2089 | unsigned char nonvis, |
| 2090 | bool only_if_ref, |
| 2091 | bool force_override) |
| 2092 | { |
| 2093 | Sized_symbol<size>* sym; |
| 2094 | Sized_symbol<size>* oldsym; |
| 2095 | bool resolve_oldsym; |
| 2096 | |
| 2097 | if (parameters->target().is_big_endian()) |
| 2098 | { |
| 2099 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) |
| 2100 | sym = this->define_special_symbol<size, true>(&name, &version, |
| 2101 | only_if_ref, &oldsym, |
| 2102 | &resolve_oldsym); |
| 2103 | #else |
| 2104 | gold_unreachable(); |
| 2105 | #endif |
| 2106 | } |
| 2107 | else |
| 2108 | { |
| 2109 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) |
| 2110 | sym = this->define_special_symbol<size, false>(&name, &version, |
| 2111 | only_if_ref, &oldsym, |
| 2112 | &resolve_oldsym); |
| 2113 | #else |
| 2114 | gold_unreachable(); |
| 2115 | #endif |
| 2116 | } |
| 2117 | |
| 2118 | if (sym == NULL) |
| 2119 | return NULL; |
| 2120 | |
| 2121 | sym->init_constant(name, version, value, symsize, type, binding, visibility, |
| 2122 | nonvis, defined == PREDEFINED); |
| 2123 | |
| 2124 | if (oldsym == NULL) |
| 2125 | { |
| 2126 | // Version symbols are absolute symbols with name == version. |
| 2127 | // We don't want to force them to be local. |
| 2128 | if ((version == NULL |
| 2129 | || name != version |
| 2130 | || value != 0) |
| 2131 | && (binding == elfcpp::STB_LOCAL |
| 2132 | || this->version_script_.symbol_is_local(name))) |
| 2133 | this->force_local(sym); |
| 2134 | else if (version != NULL |
| 2135 | && (name != version || value != 0)) |
| 2136 | sym->set_is_default(); |
| 2137 | return sym; |
| 2138 | } |
| 2139 | |
| 2140 | if (force_override |
| 2141 | || Symbol_table::should_override_with_special(oldsym, type, defined)) |
| 2142 | this->override_with_special(oldsym, sym); |
| 2143 | |
| 2144 | if (resolve_oldsym) |
| 2145 | return sym; |
| 2146 | else |
| 2147 | { |
| 2148 | delete sym; |
| 2149 | return oldsym; |
| 2150 | } |
| 2151 | } |
| 2152 | |
| 2153 | // Define a set of symbols in output sections. |
| 2154 | |
| 2155 | void |
| 2156 | Symbol_table::define_symbols(const Layout* layout, int count, |
| 2157 | const Define_symbol_in_section* p, |
| 2158 | bool only_if_ref) |
| 2159 | { |
| 2160 | for (int i = 0; i < count; ++i, ++p) |
| 2161 | { |
| 2162 | Output_section* os = layout->find_output_section(p->output_section); |
| 2163 | if (os != NULL) |
| 2164 | this->define_in_output_data(p->name, NULL, PREDEFINED, os, p->value, |
| 2165 | p->size, p->type, p->binding, |
| 2166 | p->visibility, p->nonvis, |
| 2167 | p->offset_is_from_end, |
| 2168 | only_if_ref || p->only_if_ref); |
| 2169 | else |
| 2170 | this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size, |
| 2171 | p->type, p->binding, p->visibility, p->nonvis, |
| 2172 | only_if_ref || p->only_if_ref, |
| 2173 | false); |
| 2174 | } |
| 2175 | } |
| 2176 | |
| 2177 | // Define a set of symbols in output segments. |
| 2178 | |
| 2179 | void |
| 2180 | Symbol_table::define_symbols(const Layout* layout, int count, |
| 2181 | const Define_symbol_in_segment* p, |
| 2182 | bool only_if_ref) |
| 2183 | { |
| 2184 | for (int i = 0; i < count; ++i, ++p) |
| 2185 | { |
| 2186 | Output_segment* os = layout->find_output_segment(p->segment_type, |
| 2187 | p->segment_flags_set, |
| 2188 | p->segment_flags_clear); |
| 2189 | if (os != NULL) |
| 2190 | this->define_in_output_segment(p->name, NULL, PREDEFINED, os, p->value, |
| 2191 | p->size, p->type, p->binding, |
| 2192 | p->visibility, p->nonvis, |
| 2193 | p->offset_base, |
| 2194 | only_if_ref || p->only_if_ref); |
| 2195 | else |
| 2196 | this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size, |
| 2197 | p->type, p->binding, p->visibility, p->nonvis, |
| 2198 | only_if_ref || p->only_if_ref, |
| 2199 | false); |
| 2200 | } |
| 2201 | } |
| 2202 | |
| 2203 | // Define CSYM using a COPY reloc. POSD is the Output_data where the |
| 2204 | // symbol should be defined--typically a .dyn.bss section. VALUE is |
| 2205 | // the offset within POSD. |
| 2206 | |
| 2207 | template<int size> |
| 2208 | void |
| 2209 | Symbol_table::define_with_copy_reloc( |
| 2210 | Sized_symbol<size>* csym, |
| 2211 | Output_data* posd, |
| 2212 | typename elfcpp::Elf_types<size>::Elf_Addr value) |
| 2213 | { |
| 2214 | gold_assert(csym->is_from_dynobj()); |
| 2215 | gold_assert(!csym->is_copied_from_dynobj()); |
| 2216 | Object* object = csym->object(); |
| 2217 | gold_assert(object->is_dynamic()); |
| 2218 | Dynobj* dynobj = static_cast<Dynobj*>(object); |
| 2219 | |
| 2220 | // Our copied variable has to override any variable in a shared |
| 2221 | // library. |
| 2222 | elfcpp::STB binding = csym->binding(); |
| 2223 | if (binding == elfcpp::STB_WEAK) |
| 2224 | binding = elfcpp::STB_GLOBAL; |
| 2225 | |
| 2226 | this->define_in_output_data(csym->name(), csym->version(), COPY, |
| 2227 | posd, value, csym->symsize(), |
| 2228 | csym->type(), binding, |
| 2229 | csym->visibility(), csym->nonvis(), |
| 2230 | false, false); |
| 2231 | |
| 2232 | csym->set_is_copied_from_dynobj(); |
| 2233 | csym->set_needs_dynsym_entry(); |
| 2234 | |
| 2235 | this->copied_symbol_dynobjs_[csym] = dynobj; |
| 2236 | |
| 2237 | // We have now defined all aliases, but we have not entered them all |
| 2238 | // in the copied_symbol_dynobjs_ map. |
| 2239 | if (csym->has_alias()) |
| 2240 | { |
| 2241 | Symbol* sym = csym; |
| 2242 | while (true) |
| 2243 | { |
| 2244 | sym = this->weak_aliases_[sym]; |
| 2245 | if (sym == csym) |
| 2246 | break; |
| 2247 | gold_assert(sym->output_data() == posd); |
| 2248 | |
| 2249 | sym->set_is_copied_from_dynobj(); |
| 2250 | this->copied_symbol_dynobjs_[sym] = dynobj; |
| 2251 | } |
| 2252 | } |
| 2253 | } |
| 2254 | |
| 2255 | // SYM is defined using a COPY reloc. Return the dynamic object where |
| 2256 | // the original definition was found. |
| 2257 | |
| 2258 | Dynobj* |
| 2259 | Symbol_table::get_copy_source(const Symbol* sym) const |
| 2260 | { |
| 2261 | gold_assert(sym->is_copied_from_dynobj()); |
| 2262 | Copied_symbol_dynobjs::const_iterator p = |
| 2263 | this->copied_symbol_dynobjs_.find(sym); |
| 2264 | gold_assert(p != this->copied_symbol_dynobjs_.end()); |
| 2265 | return p->second; |
| 2266 | } |
| 2267 | |
| 2268 | // Add any undefined symbols named on the command line. |
| 2269 | |
| 2270 | void |
| 2271 | Symbol_table::add_undefined_symbols_from_command_line(Layout* layout) |
| 2272 | { |
| 2273 | if (parameters->options().any_undefined() |
| 2274 | || layout->script_options()->any_unreferenced()) |
| 2275 | { |
| 2276 | if (parameters->target().get_size() == 32) |
| 2277 | { |
| 2278 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
| 2279 | this->do_add_undefined_symbols_from_command_line<32>(layout); |
| 2280 | #else |
| 2281 | gold_unreachable(); |
| 2282 | #endif |
| 2283 | } |
| 2284 | else if (parameters->target().get_size() == 64) |
| 2285 | { |
| 2286 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) |
| 2287 | this->do_add_undefined_symbols_from_command_line<64>(layout); |
| 2288 | #else |
| 2289 | gold_unreachable(); |
| 2290 | #endif |
| 2291 | } |
| 2292 | else |
| 2293 | gold_unreachable(); |
| 2294 | } |
| 2295 | } |
| 2296 | |
| 2297 | template<int size> |
| 2298 | void |
| 2299 | Symbol_table::do_add_undefined_symbols_from_command_line(Layout* layout) |
| 2300 | { |
| 2301 | for (options::String_set::const_iterator p = |
| 2302 | parameters->options().undefined_begin(); |
| 2303 | p != parameters->options().undefined_end(); |
| 2304 | ++p) |
| 2305 | this->add_undefined_symbol_from_command_line<size>(p->c_str()); |
| 2306 | |
| 2307 | for (options::String_set::const_iterator p = |
| 2308 | parameters->options().export_dynamic_symbol_begin(); |
| 2309 | p != parameters->options().export_dynamic_symbol_end(); |
| 2310 | ++p) |
| 2311 | this->add_undefined_symbol_from_command_line<size>(p->c_str()); |
| 2312 | |
| 2313 | for (Script_options::referenced_const_iterator p = |
| 2314 | layout->script_options()->referenced_begin(); |
| 2315 | p != layout->script_options()->referenced_end(); |
| 2316 | ++p) |
| 2317 | this->add_undefined_symbol_from_command_line<size>(p->c_str()); |
| 2318 | } |
| 2319 | |
| 2320 | template<int size> |
| 2321 | void |
| 2322 | Symbol_table::add_undefined_symbol_from_command_line(const char* name) |
| 2323 | { |
| 2324 | if (this->lookup(name) != NULL) |
| 2325 | return; |
| 2326 | |
| 2327 | const char* version = NULL; |
| 2328 | |
| 2329 | Sized_symbol<size>* sym; |
| 2330 | Sized_symbol<size>* oldsym; |
| 2331 | bool resolve_oldsym; |
| 2332 | if (parameters->target().is_big_endian()) |
| 2333 | { |
| 2334 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) |
| 2335 | sym = this->define_special_symbol<size, true>(&name, &version, |
| 2336 | false, &oldsym, |
| 2337 | &resolve_oldsym); |
| 2338 | #else |
| 2339 | gold_unreachable(); |
| 2340 | #endif |
| 2341 | } |
| 2342 | else |
| 2343 | { |
| 2344 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) |
| 2345 | sym = this->define_special_symbol<size, false>(&name, &version, |
| 2346 | false, &oldsym, |
| 2347 | &resolve_oldsym); |
| 2348 | #else |
| 2349 | gold_unreachable(); |
| 2350 | #endif |
| 2351 | } |
| 2352 | |
| 2353 | gold_assert(oldsym == NULL); |
| 2354 | |
| 2355 | sym->init_undefined(name, version, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| 2356 | elfcpp::STV_DEFAULT, 0); |
| 2357 | ++this->saw_undefined_; |
| 2358 | } |
| 2359 | |
| 2360 | // Set the dynamic symbol indexes. INDEX is the index of the first |
| 2361 | // global dynamic symbol. Pointers to the symbols are stored into the |
| 2362 | // vector SYMS. The names are added to DYNPOOL. This returns an |
| 2363 | // updated dynamic symbol index. |
| 2364 | |
| 2365 | unsigned int |
| 2366 | Symbol_table::set_dynsym_indexes(unsigned int index, |
| 2367 | std::vector<Symbol*>* syms, |
| 2368 | Stringpool* dynpool, |
| 2369 | Versions* versions) |
| 2370 | { |
| 2371 | std::vector<Symbol*> as_needed_sym; |
| 2372 | |
| 2373 | for (Symbol_table_type::iterator p = this->table_.begin(); |
| 2374 | p != this->table_.end(); |
| 2375 | ++p) |
| 2376 | { |
| 2377 | Symbol* sym = p->second; |
| 2378 | |
| 2379 | // Note that SYM may already have a dynamic symbol index, since |
| 2380 | // some symbols appear more than once in the symbol table, with |
| 2381 | // and without a version. |
| 2382 | |
| 2383 | if (!sym->should_add_dynsym_entry(this)) |
| 2384 | sym->set_dynsym_index(-1U); |
| 2385 | else if (!sym->has_dynsym_index()) |
| 2386 | { |
| 2387 | sym->set_dynsym_index(index); |
| 2388 | ++index; |
| 2389 | syms->push_back(sym); |
| 2390 | dynpool->add(sym->name(), false, NULL); |
| 2391 | |
| 2392 | // If the symbol is defined in a dynamic object and is |
| 2393 | // referenced strongly in a regular object, then mark the |
| 2394 | // dynamic object as needed. This is used to implement |
| 2395 | // --as-needed. |
| 2396 | if (sym->is_from_dynobj() |
| 2397 | && sym->in_reg() |
| 2398 | && !sym->is_undef_binding_weak()) |
| 2399 | sym->object()->set_is_needed(); |
| 2400 | |
| 2401 | // Record any version information, except those from |
| 2402 | // as-needed libraries not seen to be needed. Note that the |
| 2403 | // is_needed state for such libraries can change in this loop. |
| 2404 | if (sym->version() != NULL) |
| 2405 | { |
| 2406 | if (!sym->is_from_dynobj() |
| 2407 | || !sym->object()->as_needed() |
| 2408 | || sym->object()->is_needed()) |
| 2409 | versions->record_version(this, dynpool, sym); |
| 2410 | else |
| 2411 | as_needed_sym.push_back(sym); |
| 2412 | } |
| 2413 | } |
| 2414 | } |
| 2415 | |
| 2416 | // Process version information for symbols from as-needed libraries. |
| 2417 | for (std::vector<Symbol*>::iterator p = as_needed_sym.begin(); |
| 2418 | p != as_needed_sym.end(); |
| 2419 | ++p) |
| 2420 | { |
| 2421 | Symbol* sym = *p; |
| 2422 | |
| 2423 | if (sym->object()->is_needed()) |
| 2424 | versions->record_version(this, dynpool, sym); |
| 2425 | else |
| 2426 | sym->clear_version(); |
| 2427 | } |
| 2428 | |
| 2429 | // Finish up the versions. In some cases this may add new dynamic |
| 2430 | // symbols. |
| 2431 | index = versions->finalize(this, index, syms); |
| 2432 | |
| 2433 | return index; |
| 2434 | } |
| 2435 | |
| 2436 | // Set the final values for all the symbols. The index of the first |
| 2437 | // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the |
| 2438 | // file offset OFF. Add their names to POOL. Return the new file |
| 2439 | // offset. Update *PLOCAL_SYMCOUNT if necessary. |
| 2440 | |
| 2441 | off_t |
| 2442 | Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index, |
| 2443 | size_t dyncount, Stringpool* pool, |
| 2444 | unsigned int* plocal_symcount) |
| 2445 | { |
| 2446 | off_t ret; |
| 2447 | |
| 2448 | gold_assert(*plocal_symcount != 0); |
| 2449 | this->first_global_index_ = *plocal_symcount; |
| 2450 | |
| 2451 | this->dynamic_offset_ = dynoff; |
| 2452 | this->first_dynamic_global_index_ = dyn_global_index; |
| 2453 | this->dynamic_count_ = dyncount; |
| 2454 | |
| 2455 | if (parameters->target().get_size() == 32) |
| 2456 | { |
| 2457 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE) |
| 2458 | ret = this->sized_finalize<32>(off, pool, plocal_symcount); |
| 2459 | #else |
| 2460 | gold_unreachable(); |
| 2461 | #endif |
| 2462 | } |
| 2463 | else if (parameters->target().get_size() == 64) |
| 2464 | { |
| 2465 | #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE) |
| 2466 | ret = this->sized_finalize<64>(off, pool, plocal_symcount); |
| 2467 | #else |
| 2468 | gold_unreachable(); |
| 2469 | #endif |
| 2470 | } |
| 2471 | else |
| 2472 | gold_unreachable(); |
| 2473 | |
| 2474 | // Now that we have the final symbol table, we can reliably note |
| 2475 | // which symbols should get warnings. |
| 2476 | this->warnings_.note_warnings(this); |
| 2477 | |
| 2478 | return ret; |
| 2479 | } |
| 2480 | |
| 2481 | // SYM is going into the symbol table at *PINDEX. Add the name to |
| 2482 | // POOL, update *PINDEX and *POFF. |
| 2483 | |
| 2484 | template<int size> |
| 2485 | void |
| 2486 | Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool, |
| 2487 | unsigned int* pindex, off_t* poff) |
| 2488 | { |
| 2489 | sym->set_symtab_index(*pindex); |
| 2490 | if (sym->version() == NULL || !parameters->options().relocatable()) |
| 2491 | pool->add(sym->name(), false, NULL); |
| 2492 | else |
| 2493 | pool->add(sym->versioned_name(), true, NULL); |
| 2494 | ++*pindex; |
| 2495 | *poff += elfcpp::Elf_sizes<size>::sym_size; |
| 2496 | } |
| 2497 | |
| 2498 | // Set the final value for all the symbols. This is called after |
| 2499 | // Layout::finalize, so all the output sections have their final |
| 2500 | // address. |
| 2501 | |
| 2502 | template<int size> |
| 2503 | off_t |
| 2504 | Symbol_table::sized_finalize(off_t off, Stringpool* pool, |
| 2505 | unsigned int* plocal_symcount) |
| 2506 | { |
| 2507 | off = align_address(off, size >> 3); |
| 2508 | this->offset_ = off; |
| 2509 | |
| 2510 | unsigned int index = *plocal_symcount; |
| 2511 | const unsigned int orig_index = index; |
| 2512 | |
| 2513 | // First do all the symbols which have been forced to be local, as |
| 2514 | // they must appear before all global symbols. |
| 2515 | for (Forced_locals::iterator p = this->forced_locals_.begin(); |
| 2516 | p != this->forced_locals_.end(); |
| 2517 | ++p) |
| 2518 | { |
| 2519 | Symbol* sym = *p; |
| 2520 | gold_assert(sym->is_forced_local()); |
| 2521 | if (this->sized_finalize_symbol<size>(sym)) |
| 2522 | { |
| 2523 | this->add_to_final_symtab<size>(sym, pool, &index, &off); |
| 2524 | ++*plocal_symcount; |
| 2525 | } |
| 2526 | } |
| 2527 | |
| 2528 | // Now do all the remaining symbols. |
| 2529 | for (Symbol_table_type::iterator p = this->table_.begin(); |
| 2530 | p != this->table_.end(); |
| 2531 | ++p) |
| 2532 | { |
| 2533 | Symbol* sym = p->second; |
| 2534 | if (this->sized_finalize_symbol<size>(sym)) |
| 2535 | this->add_to_final_symtab<size>(sym, pool, &index, &off); |
| 2536 | } |
| 2537 | |
| 2538 | this->output_count_ = index - orig_index; |
| 2539 | |
| 2540 | return off; |
| 2541 | } |
| 2542 | |
| 2543 | // Compute the final value of SYM and store status in location PSTATUS. |
| 2544 | // During relaxation, this may be called multiple times for a symbol to |
| 2545 | // compute its would-be final value in each relaxation pass. |
| 2546 | |
| 2547 | template<int size> |
| 2548 | typename Sized_symbol<size>::Value_type |
| 2549 | Symbol_table::compute_final_value( |
| 2550 | const Sized_symbol<size>* sym, |
| 2551 | Compute_final_value_status* pstatus) const |
| 2552 | { |
| 2553 | typedef typename Sized_symbol<size>::Value_type Value_type; |
| 2554 | Value_type value; |
| 2555 | |
| 2556 | switch (sym->source()) |
| 2557 | { |
| 2558 | case Symbol::FROM_OBJECT: |
| 2559 | { |
| 2560 | bool is_ordinary; |
| 2561 | unsigned int shndx = sym->shndx(&is_ordinary); |
| 2562 | |
| 2563 | if (!is_ordinary |
| 2564 | && shndx != elfcpp::SHN_ABS |
| 2565 | && !Symbol::is_common_shndx(shndx)) |
| 2566 | { |
| 2567 | *pstatus = CFVS_UNSUPPORTED_SYMBOL_SECTION; |
| 2568 | return 0; |
| 2569 | } |
| 2570 | |
| 2571 | Object* symobj = sym->object(); |
| 2572 | if (symobj->is_dynamic()) |
| 2573 | { |
| 2574 | value = 0; |
| 2575 | shndx = elfcpp::SHN_UNDEF; |
| 2576 | } |
| 2577 | else if (symobj->pluginobj() != NULL) |
| 2578 | { |
| 2579 | value = 0; |
| 2580 | shndx = elfcpp::SHN_UNDEF; |
| 2581 | } |
| 2582 | else if (shndx == elfcpp::SHN_UNDEF) |
| 2583 | value = 0; |
| 2584 | else if (!is_ordinary |
| 2585 | && (shndx == elfcpp::SHN_ABS |
| 2586 | || Symbol::is_common_shndx(shndx))) |
| 2587 | value = sym->value(); |
| 2588 | else |
| 2589 | { |
| 2590 | Relobj* relobj = static_cast<Relobj*>(symobj); |
| 2591 | Output_section* os = relobj->output_section(shndx); |
| 2592 | |
| 2593 | if (this->is_section_folded(relobj, shndx)) |
| 2594 | { |
| 2595 | gold_assert(os == NULL); |
| 2596 | // Get the os of the section it is folded onto. |
| 2597 | Section_id folded = this->icf_->get_folded_section(relobj, |
| 2598 | shndx); |
| 2599 | gold_assert(folded.first != NULL); |
| 2600 | Relobj* folded_obj = reinterpret_cast<Relobj*>(folded.first); |
| 2601 | unsigned folded_shndx = folded.second; |
| 2602 | |
| 2603 | os = folded_obj->output_section(folded_shndx); |
| 2604 | gold_assert(os != NULL); |
| 2605 | |
| 2606 | // Replace (relobj, shndx) with canonical ICF input section. |
| 2607 | shndx = folded_shndx; |
| 2608 | relobj = folded_obj; |
| 2609 | } |
| 2610 | |
| 2611 | uint64_t secoff64 = relobj->output_section_offset(shndx); |
| 2612 | if (os == NULL) |
| 2613 | { |
| 2614 | bool static_or_reloc = (parameters->doing_static_link() || |
| 2615 | parameters->options().relocatable()); |
| 2616 | gold_assert(static_or_reloc || sym->dynsym_index() == -1U); |
| 2617 | |
| 2618 | *pstatus = CFVS_NO_OUTPUT_SECTION; |
| 2619 | return 0; |
| 2620 | } |
| 2621 | |
| 2622 | if (secoff64 == -1ULL) |
| 2623 | { |
| 2624 | // The section needs special handling (e.g., a merge section). |
| 2625 | |
| 2626 | value = os->output_address(relobj, shndx, sym->value()); |
| 2627 | } |
| 2628 | else |
| 2629 | { |
| 2630 | Value_type secoff = |
| 2631 | convert_types<Value_type, uint64_t>(secoff64); |
| 2632 | if (sym->type() == elfcpp::STT_TLS) |
| 2633 | value = sym->value() + os->tls_offset() + secoff; |
| 2634 | else |
| 2635 | value = sym->value() + os->address() + secoff; |
| 2636 | } |
| 2637 | } |
| 2638 | } |
| 2639 | break; |
| 2640 | |
| 2641 | case Symbol::IN_OUTPUT_DATA: |
| 2642 | { |
| 2643 | Output_data* od = sym->output_data(); |
| 2644 | value = sym->value(); |
| 2645 | if (sym->type() != elfcpp::STT_TLS) |
| 2646 | value += od->address(); |
| 2647 | else |
| 2648 | { |
| 2649 | Output_section* os = od->output_section(); |
| 2650 | gold_assert(os != NULL); |
| 2651 | value += os->tls_offset() + (od->address() - os->address()); |
| 2652 | } |
| 2653 | if (sym->offset_is_from_end()) |
| 2654 | value += od->data_size(); |
| 2655 | } |
| 2656 | break; |
| 2657 | |
| 2658 | case Symbol::IN_OUTPUT_SEGMENT: |
| 2659 | { |
| 2660 | Output_segment* os = sym->output_segment(); |
| 2661 | value = sym->value(); |
| 2662 | if (sym->type() != elfcpp::STT_TLS) |
| 2663 | value += os->vaddr(); |
| 2664 | switch (sym->offset_base()) |
| 2665 | { |
| 2666 | case Symbol::SEGMENT_START: |
| 2667 | break; |
| 2668 | case Symbol::SEGMENT_END: |
| 2669 | value += os->memsz(); |
| 2670 | break; |
| 2671 | case Symbol::SEGMENT_BSS: |
| 2672 | value += os->filesz(); |
| 2673 | break; |
| 2674 | default: |
| 2675 | gold_unreachable(); |
| 2676 | } |
| 2677 | } |
| 2678 | break; |
| 2679 | |
| 2680 | case Symbol::IS_CONSTANT: |
| 2681 | value = sym->value(); |
| 2682 | break; |
| 2683 | |
| 2684 | case Symbol::IS_UNDEFINED: |
| 2685 | value = 0; |
| 2686 | break; |
| 2687 | |
| 2688 | default: |
| 2689 | gold_unreachable(); |
| 2690 | } |
| 2691 | |
| 2692 | *pstatus = CFVS_OK; |
| 2693 | return value; |
| 2694 | } |
| 2695 | |
| 2696 | // Finalize the symbol SYM. This returns true if the symbol should be |
| 2697 | // added to the symbol table, false otherwise. |
| 2698 | |
| 2699 | template<int size> |
| 2700 | bool |
| 2701 | Symbol_table::sized_finalize_symbol(Symbol* unsized_sym) |
| 2702 | { |
| 2703 | typedef typename Sized_symbol<size>::Value_type Value_type; |
| 2704 | |
| 2705 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym); |
| 2706 | |
| 2707 | // The default version of a symbol may appear twice in the symbol |
| 2708 | // table. We only need to finalize it once. |
| 2709 | if (sym->has_symtab_index()) |
| 2710 | return false; |
| 2711 | |
| 2712 | if (!sym->in_reg()) |
| 2713 | { |
| 2714 | gold_assert(!sym->has_symtab_index()); |
| 2715 | sym->set_symtab_index(-1U); |
| 2716 | gold_assert(sym->dynsym_index() == -1U); |
| 2717 | return false; |
| 2718 | } |
| 2719 | |
| 2720 | // If the symbol is only present on plugin files, the plugin decided we |
| 2721 | // don't need it. |
| 2722 | if (!sym->in_real_elf()) |
| 2723 | { |
| 2724 | gold_assert(!sym->has_symtab_index()); |
| 2725 | sym->set_symtab_index(-1U); |
| 2726 | return false; |
| 2727 | } |
| 2728 | |
| 2729 | // Compute final symbol value. |
| 2730 | Compute_final_value_status status; |
| 2731 | Value_type value = this->compute_final_value(sym, &status); |
| 2732 | |
| 2733 | switch (status) |
| 2734 | { |
| 2735 | case CFVS_OK: |
| 2736 | break; |
| 2737 | case CFVS_UNSUPPORTED_SYMBOL_SECTION: |
| 2738 | { |
| 2739 | bool is_ordinary; |
| 2740 | unsigned int shndx = sym->shndx(&is_ordinary); |
| 2741 | gold_error(_("%s: unsupported symbol section 0x%x"), |
| 2742 | sym->demangled_name().c_str(), shndx); |
| 2743 | } |
| 2744 | break; |
| 2745 | case CFVS_NO_OUTPUT_SECTION: |
| 2746 | sym->set_symtab_index(-1U); |
| 2747 | return false; |
| 2748 | default: |
| 2749 | gold_unreachable(); |
| 2750 | } |
| 2751 | |
| 2752 | sym->set_value(value); |
| 2753 | |
| 2754 | if (parameters->options().strip_all() |
| 2755 | || !parameters->options().should_retain_symbol(sym->name())) |
| 2756 | { |
| 2757 | sym->set_symtab_index(-1U); |
| 2758 | return false; |
| 2759 | } |
| 2760 | |
| 2761 | return true; |
| 2762 | } |
| 2763 | |
| 2764 | // Write out the global symbols. |
| 2765 | |
| 2766 | void |
| 2767 | Symbol_table::write_globals(const Stringpool* sympool, |
| 2768 | const Stringpool* dynpool, |
| 2769 | Output_symtab_xindex* symtab_xindex, |
| 2770 | Output_symtab_xindex* dynsym_xindex, |
| 2771 | Output_file* of) const |
| 2772 | { |
| 2773 | switch (parameters->size_and_endianness()) |
| 2774 | { |
| 2775 | #ifdef HAVE_TARGET_32_LITTLE |
| 2776 | case Parameters::TARGET_32_LITTLE: |
| 2777 | this->sized_write_globals<32, false>(sympool, dynpool, symtab_xindex, |
| 2778 | dynsym_xindex, of); |
| 2779 | break; |
| 2780 | #endif |
| 2781 | #ifdef HAVE_TARGET_32_BIG |
| 2782 | case Parameters::TARGET_32_BIG: |
| 2783 | this->sized_write_globals<32, true>(sympool, dynpool, symtab_xindex, |
| 2784 | dynsym_xindex, of); |
| 2785 | break; |
| 2786 | #endif |
| 2787 | #ifdef HAVE_TARGET_64_LITTLE |
| 2788 | case Parameters::TARGET_64_LITTLE: |
| 2789 | this->sized_write_globals<64, false>(sympool, dynpool, symtab_xindex, |
| 2790 | dynsym_xindex, of); |
| 2791 | break; |
| 2792 | #endif |
| 2793 | #ifdef HAVE_TARGET_64_BIG |
| 2794 | case Parameters::TARGET_64_BIG: |
| 2795 | this->sized_write_globals<64, true>(sympool, dynpool, symtab_xindex, |
| 2796 | dynsym_xindex, of); |
| 2797 | break; |
| 2798 | #endif |
| 2799 | default: |
| 2800 | gold_unreachable(); |
| 2801 | } |
| 2802 | } |
| 2803 | |
| 2804 | // Write out the global symbols. |
| 2805 | |
| 2806 | template<int size, bool big_endian> |
| 2807 | void |
| 2808 | Symbol_table::sized_write_globals(const Stringpool* sympool, |
| 2809 | const Stringpool* dynpool, |
| 2810 | Output_symtab_xindex* symtab_xindex, |
| 2811 | Output_symtab_xindex* dynsym_xindex, |
| 2812 | Output_file* of) const |
| 2813 | { |
| 2814 | const Target& target = parameters->target(); |
| 2815 | |
| 2816 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
| 2817 | |
| 2818 | const unsigned int output_count = this->output_count_; |
| 2819 | const section_size_type oview_size = output_count * sym_size; |
| 2820 | const unsigned int first_global_index = this->first_global_index_; |
| 2821 | unsigned char* psyms; |
| 2822 | if (this->offset_ == 0 || output_count == 0) |
| 2823 | psyms = NULL; |
| 2824 | else |
| 2825 | psyms = of->get_output_view(this->offset_, oview_size); |
| 2826 | |
| 2827 | const unsigned int dynamic_count = this->dynamic_count_; |
| 2828 | const section_size_type dynamic_size = dynamic_count * sym_size; |
| 2829 | const unsigned int first_dynamic_global_index = |
| 2830 | this->first_dynamic_global_index_; |
| 2831 | unsigned char* dynamic_view; |
| 2832 | if (this->dynamic_offset_ == 0 || dynamic_count == 0) |
| 2833 | dynamic_view = NULL; |
| 2834 | else |
| 2835 | dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size); |
| 2836 | |
| 2837 | for (Symbol_table_type::const_iterator p = this->table_.begin(); |
| 2838 | p != this->table_.end(); |
| 2839 | ++p) |
| 2840 | { |
| 2841 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second); |
| 2842 | |
| 2843 | // Possibly warn about unresolved symbols in shared libraries. |
| 2844 | this->warn_about_undefined_dynobj_symbol(sym); |
| 2845 | |
| 2846 | unsigned int sym_index = sym->symtab_index(); |
| 2847 | unsigned int dynsym_index; |
| 2848 | if (dynamic_view == NULL) |
| 2849 | dynsym_index = -1U; |
| 2850 | else |
| 2851 | dynsym_index = sym->dynsym_index(); |
| 2852 | |
| 2853 | if (sym_index == -1U && dynsym_index == -1U) |
| 2854 | { |
| 2855 | // This symbol is not included in the output file. |
| 2856 | continue; |
| 2857 | } |
| 2858 | |
| 2859 | unsigned int shndx; |
| 2860 | typename elfcpp::Elf_types<size>::Elf_Addr sym_value = sym->value(); |
| 2861 | typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value; |
| 2862 | elfcpp::STB binding = sym->binding(); |
| 2863 | |
| 2864 | // If --no-gnu-unique is set, change STB_GNU_UNIQUE to STB_GLOBAL. |
| 2865 | if (binding == elfcpp::STB_GNU_UNIQUE |
| 2866 | && !parameters->options().gnu_unique()) |
| 2867 | binding = elfcpp::STB_GLOBAL; |
| 2868 | |
| 2869 | switch (sym->source()) |
| 2870 | { |
| 2871 | case Symbol::FROM_OBJECT: |
| 2872 | { |
| 2873 | bool is_ordinary; |
| 2874 | unsigned int in_shndx = sym->shndx(&is_ordinary); |
| 2875 | |
| 2876 | if (!is_ordinary |
| 2877 | && in_shndx != elfcpp::SHN_ABS |
| 2878 | && !Symbol::is_common_shndx(in_shndx)) |
| 2879 | { |
| 2880 | gold_error(_("%s: unsupported symbol section 0x%x"), |
| 2881 | sym->demangled_name().c_str(), in_shndx); |
| 2882 | shndx = in_shndx; |
| 2883 | } |
| 2884 | else |
| 2885 | { |
| 2886 | Object* symobj = sym->object(); |
| 2887 | if (symobj->is_dynamic()) |
| 2888 | { |
| 2889 | if (sym->needs_dynsym_value()) |
| 2890 | dynsym_value = target.dynsym_value(sym); |
| 2891 | shndx = elfcpp::SHN_UNDEF; |
| 2892 | if (sym->is_undef_binding_weak()) |
| 2893 | binding = elfcpp::STB_WEAK; |
| 2894 | else |
| 2895 | binding = elfcpp::STB_GLOBAL; |
| 2896 | } |
| 2897 | else if (symobj->pluginobj() != NULL) |
| 2898 | shndx = elfcpp::SHN_UNDEF; |
| 2899 | else if (in_shndx == elfcpp::SHN_UNDEF |
| 2900 | || (!is_ordinary |
| 2901 | && (in_shndx == elfcpp::SHN_ABS |
| 2902 | || Symbol::is_common_shndx(in_shndx)))) |
| 2903 | shndx = in_shndx; |
| 2904 | else |
| 2905 | { |
| 2906 | Relobj* relobj = static_cast<Relobj*>(symobj); |
| 2907 | Output_section* os = relobj->output_section(in_shndx); |
| 2908 | if (this->is_section_folded(relobj, in_shndx)) |
| 2909 | { |
| 2910 | // This global symbol must be written out even though |
| 2911 | // it is folded. |
| 2912 | // Get the os of the section it is folded onto. |
| 2913 | Section_id folded = |
| 2914 | this->icf_->get_folded_section(relobj, in_shndx); |
| 2915 | gold_assert(folded.first !=NULL); |
| 2916 | Relobj* folded_obj = |
| 2917 | reinterpret_cast<Relobj*>(folded.first); |
| 2918 | os = folded_obj->output_section(folded.second); |
| 2919 | gold_assert(os != NULL); |
| 2920 | } |
| 2921 | gold_assert(os != NULL); |
| 2922 | shndx = os->out_shndx(); |
| 2923 | |
| 2924 | if (shndx >= elfcpp::SHN_LORESERVE) |
| 2925 | { |
| 2926 | if (sym_index != -1U) |
| 2927 | symtab_xindex->add(sym_index, shndx); |
| 2928 | if (dynsym_index != -1U) |
| 2929 | dynsym_xindex->add(dynsym_index, shndx); |
| 2930 | shndx = elfcpp::SHN_XINDEX; |
| 2931 | } |
| 2932 | |
| 2933 | // In object files symbol values are section |
| 2934 | // relative. |
| 2935 | if (parameters->options().relocatable()) |
| 2936 | sym_value -= os->address(); |
| 2937 | } |
| 2938 | } |
| 2939 | } |
| 2940 | break; |
| 2941 | |
| 2942 | case Symbol::IN_OUTPUT_DATA: |
| 2943 | { |
| 2944 | Output_data* od = sym->output_data(); |
| 2945 | |
| 2946 | shndx = od->out_shndx(); |
| 2947 | if (shndx >= elfcpp::SHN_LORESERVE) |
| 2948 | { |
| 2949 | if (sym_index != -1U) |
| 2950 | symtab_xindex->add(sym_index, shndx); |
| 2951 | if (dynsym_index != -1U) |
| 2952 | dynsym_xindex->add(dynsym_index, shndx); |
| 2953 | shndx = elfcpp::SHN_XINDEX; |
| 2954 | } |
| 2955 | |
| 2956 | // In object files symbol values are section |
| 2957 | // relative. |
| 2958 | if (parameters->options().relocatable()) |
| 2959 | sym_value -= od->address(); |
| 2960 | } |
| 2961 | break; |
| 2962 | |
| 2963 | case Symbol::IN_OUTPUT_SEGMENT: |
| 2964 | shndx = elfcpp::SHN_ABS; |
| 2965 | break; |
| 2966 | |
| 2967 | case Symbol::IS_CONSTANT: |
| 2968 | shndx = elfcpp::SHN_ABS; |
| 2969 | break; |
| 2970 | |
| 2971 | case Symbol::IS_UNDEFINED: |
| 2972 | shndx = elfcpp::SHN_UNDEF; |
| 2973 | break; |
| 2974 | |
| 2975 | default: |
| 2976 | gold_unreachable(); |
| 2977 | } |
| 2978 | |
| 2979 | if (sym_index != -1U) |
| 2980 | { |
| 2981 | sym_index -= first_global_index; |
| 2982 | gold_assert(sym_index < output_count); |
| 2983 | unsigned char* ps = psyms + (sym_index * sym_size); |
| 2984 | this->sized_write_symbol<size, big_endian>(sym, sym_value, shndx, |
| 2985 | binding, sympool, ps); |
| 2986 | } |
| 2987 | |
| 2988 | if (dynsym_index != -1U) |
| 2989 | { |
| 2990 | dynsym_index -= first_dynamic_global_index; |
| 2991 | gold_assert(dynsym_index < dynamic_count); |
| 2992 | unsigned char* pd = dynamic_view + (dynsym_index * sym_size); |
| 2993 | this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx, |
| 2994 | binding, dynpool, pd); |
| 2995 | } |
| 2996 | } |
| 2997 | |
| 2998 | of->write_output_view(this->offset_, oview_size, psyms); |
| 2999 | if (dynamic_view != NULL) |
| 3000 | of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view); |
| 3001 | } |
| 3002 | |
| 3003 | // Write out the symbol SYM, in section SHNDX, to P. POOL is the |
| 3004 | // strtab holding the name. |
| 3005 | |
| 3006 | template<int size, bool big_endian> |
| 3007 | void |
| 3008 | Symbol_table::sized_write_symbol( |
| 3009 | Sized_symbol<size>* sym, |
| 3010 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
| 3011 | unsigned int shndx, |
| 3012 | elfcpp::STB binding, |
| 3013 | const Stringpool* pool, |
| 3014 | unsigned char* p) const |
| 3015 | { |
| 3016 | elfcpp::Sym_write<size, big_endian> osym(p); |
| 3017 | if (sym->version() == NULL || !parameters->options().relocatable()) |
| 3018 | osym.put_st_name(pool->get_offset(sym->name())); |
| 3019 | else |
| 3020 | osym.put_st_name(pool->get_offset(sym->versioned_name())); |
| 3021 | osym.put_st_value(value); |
| 3022 | // Use a symbol size of zero for undefined symbols from shared libraries. |
| 3023 | if (shndx == elfcpp::SHN_UNDEF && sym->is_from_dynobj()) |
| 3024 | osym.put_st_size(0); |
| 3025 | else |
| 3026 | osym.put_st_size(sym->symsize()); |
| 3027 | elfcpp::STT type = sym->type(); |
| 3028 | // Turn IFUNC symbols from shared libraries into normal FUNC symbols. |
| 3029 | if (type == elfcpp::STT_GNU_IFUNC |
| 3030 | && sym->is_from_dynobj()) |
| 3031 | type = elfcpp::STT_FUNC; |
| 3032 | // A version script may have overridden the default binding. |
| 3033 | if (sym->is_forced_local()) |
| 3034 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, type)); |
| 3035 | else |
| 3036 | osym.put_st_info(elfcpp::elf_st_info(binding, type)); |
| 3037 | osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis())); |
| 3038 | osym.put_st_shndx(shndx); |
| 3039 | } |
| 3040 | |
| 3041 | // Check for unresolved symbols in shared libraries. This is |
| 3042 | // controlled by the --allow-shlib-undefined option. |
| 3043 | |
| 3044 | // We only warn about libraries for which we have seen all the |
| 3045 | // DT_NEEDED entries. We don't try to track down DT_NEEDED entries |
| 3046 | // which were not seen in this link. If we didn't see a DT_NEEDED |
| 3047 | // entry, we aren't going to be able to reliably report whether the |
| 3048 | // symbol is undefined. |
| 3049 | |
| 3050 | // We also don't warn about libraries found in a system library |
| 3051 | // directory (e.g., /lib or /usr/lib); we assume that those libraries |
| 3052 | // are OK. This heuristic avoids problems on GNU/Linux, in which -ldl |
| 3053 | // can have undefined references satisfied by ld-linux.so. |
| 3054 | |
| 3055 | inline void |
| 3056 | Symbol_table::warn_about_undefined_dynobj_symbol(Symbol* sym) const |
| 3057 | { |
| 3058 | bool dummy; |
| 3059 | if (sym->source() == Symbol::FROM_OBJECT |
| 3060 | && sym->object()->is_dynamic() |
| 3061 | && sym->shndx(&dummy) == elfcpp::SHN_UNDEF |
| 3062 | && sym->binding() != elfcpp::STB_WEAK |
| 3063 | && !parameters->options().allow_shlib_undefined() |
| 3064 | && !parameters->target().is_defined_by_abi(sym) |
| 3065 | && !sym->object()->is_in_system_directory()) |
| 3066 | { |
| 3067 | // A very ugly cast. |
| 3068 | Dynobj* dynobj = static_cast<Dynobj*>(sym->object()); |
| 3069 | if (!dynobj->has_unknown_needed_entries()) |
| 3070 | gold_undefined_symbol(sym); |
| 3071 | } |
| 3072 | } |
| 3073 | |
| 3074 | // Write out a section symbol. Return the update offset. |
| 3075 | |
| 3076 | void |
| 3077 | Symbol_table::write_section_symbol(const Output_section* os, |
| 3078 | Output_symtab_xindex* symtab_xindex, |
| 3079 | Output_file* of, |
| 3080 | off_t offset) const |
| 3081 | { |
| 3082 | switch (parameters->size_and_endianness()) |
| 3083 | { |
| 3084 | #ifdef HAVE_TARGET_32_LITTLE |
| 3085 | case Parameters::TARGET_32_LITTLE: |
| 3086 | this->sized_write_section_symbol<32, false>(os, symtab_xindex, of, |
| 3087 | offset); |
| 3088 | break; |
| 3089 | #endif |
| 3090 | #ifdef HAVE_TARGET_32_BIG |
| 3091 | case Parameters::TARGET_32_BIG: |
| 3092 | this->sized_write_section_symbol<32, true>(os, symtab_xindex, of, |
| 3093 | offset); |
| 3094 | break; |
| 3095 | #endif |
| 3096 | #ifdef HAVE_TARGET_64_LITTLE |
| 3097 | case Parameters::TARGET_64_LITTLE: |
| 3098 | this->sized_write_section_symbol<64, false>(os, symtab_xindex, of, |
| 3099 | offset); |
| 3100 | break; |
| 3101 | #endif |
| 3102 | #ifdef HAVE_TARGET_64_BIG |
| 3103 | case Parameters::TARGET_64_BIG: |
| 3104 | this->sized_write_section_symbol<64, true>(os, symtab_xindex, of, |
| 3105 | offset); |
| 3106 | break; |
| 3107 | #endif |
| 3108 | default: |
| 3109 | gold_unreachable(); |
| 3110 | } |
| 3111 | } |
| 3112 | |
| 3113 | // Write out a section symbol, specialized for size and endianness. |
| 3114 | |
| 3115 | template<int size, bool big_endian> |
| 3116 | void |
| 3117 | Symbol_table::sized_write_section_symbol(const Output_section* os, |
| 3118 | Output_symtab_xindex* symtab_xindex, |
| 3119 | Output_file* of, |
| 3120 | off_t offset) const |
| 3121 | { |
| 3122 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
| 3123 | |
| 3124 | unsigned char* pov = of->get_output_view(offset, sym_size); |
| 3125 | |
| 3126 | elfcpp::Sym_write<size, big_endian> osym(pov); |
| 3127 | osym.put_st_name(0); |
| 3128 | if (parameters->options().relocatable()) |
| 3129 | osym.put_st_value(0); |
| 3130 | else |
| 3131 | osym.put_st_value(os->address()); |
| 3132 | osym.put_st_size(0); |
| 3133 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, |
| 3134 | elfcpp::STT_SECTION)); |
| 3135 | osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0)); |
| 3136 | |
| 3137 | unsigned int shndx = os->out_shndx(); |
| 3138 | if (shndx >= elfcpp::SHN_LORESERVE) |
| 3139 | { |
| 3140 | symtab_xindex->add(os->symtab_index(), shndx); |
| 3141 | shndx = elfcpp::SHN_XINDEX; |
| 3142 | } |
| 3143 | osym.put_st_shndx(shndx); |
| 3144 | |
| 3145 | of->write_output_view(offset, sym_size, pov); |
| 3146 | } |
| 3147 | |
| 3148 | // Print statistical information to stderr. This is used for --stats. |
| 3149 | |
| 3150 | void |
| 3151 | Symbol_table::print_stats() const |
| 3152 | { |
| 3153 | #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP) |
| 3154 | fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"), |
| 3155 | program_name, this->table_.size(), this->table_.bucket_count()); |
| 3156 | #else |
| 3157 | fprintf(stderr, _("%s: symbol table entries: %zu\n"), |
| 3158 | program_name, this->table_.size()); |
| 3159 | #endif |
| 3160 | this->namepool_.print_stats("symbol table stringpool"); |
| 3161 | } |
| 3162 | |
| 3163 | // We check for ODR violations by looking for symbols with the same |
| 3164 | // name for which the debugging information reports that they were |
| 3165 | // defined in disjoint source locations. When comparing the source |
| 3166 | // location, we consider instances with the same base filename to be |
| 3167 | // the same. This is because different object files/shared libraries |
| 3168 | // can include the same header file using different paths, and |
| 3169 | // different optimization settings can make the line number appear to |
| 3170 | // be a couple lines off, and we don't want to report an ODR violation |
| 3171 | // in those cases. |
| 3172 | |
| 3173 | // This struct is used to compare line information, as returned by |
| 3174 | // Dwarf_line_info::one_addr2line. It implements a < comparison |
| 3175 | // operator used with std::sort. |
| 3176 | |
| 3177 | struct Odr_violation_compare |
| 3178 | { |
| 3179 | bool |
| 3180 | operator()(const std::string& s1, const std::string& s2) const |
| 3181 | { |
| 3182 | // Inputs should be of the form "dirname/filename:linenum" where |
| 3183 | // "dirname/" is optional. We want to compare just the filename:linenum. |
| 3184 | |
| 3185 | // Find the last '/' in each string. |
| 3186 | std::string::size_type s1begin = s1.rfind('/'); |
| 3187 | std::string::size_type s2begin = s2.rfind('/'); |
| 3188 | // If there was no '/' in a string, start at the beginning. |
| 3189 | if (s1begin == std::string::npos) |
| 3190 | s1begin = 0; |
| 3191 | if (s2begin == std::string::npos) |
| 3192 | s2begin = 0; |
| 3193 | return s1.compare(s1begin, std::string::npos, |
| 3194 | s2, s2begin, std::string::npos) < 0; |
| 3195 | } |
| 3196 | }; |
| 3197 | |
| 3198 | // Returns all of the lines attached to LOC, not just the one the |
| 3199 | // instruction actually came from. |
| 3200 | std::vector<std::string> |
| 3201 | Symbol_table::linenos_from_loc(const Task* task, |
| 3202 | const Symbol_location& loc) |
| 3203 | { |
| 3204 | // We need to lock the object in order to read it. This |
| 3205 | // means that we have to run in a singleton Task. If we |
| 3206 | // want to run this in a general Task for better |
| 3207 | // performance, we will need one Task for object, plus |
| 3208 | // appropriate locking to ensure that we don't conflict with |
| 3209 | // other uses of the object. Also note, one_addr2line is not |
| 3210 | // currently thread-safe. |
| 3211 | Task_lock_obj<Object> tl(task, loc.object); |
| 3212 | |
| 3213 | std::vector<std::string> result; |
| 3214 | Symbol_location code_loc = loc; |
| 3215 | parameters->target().function_location(&code_loc); |
| 3216 | // 16 is the size of the object-cache that one_addr2line should use. |
| 3217 | std::string canonical_result = Dwarf_line_info::one_addr2line( |
| 3218 | code_loc.object, code_loc.shndx, code_loc.offset, 16, &result); |
| 3219 | if (!canonical_result.empty()) |
| 3220 | result.push_back(canonical_result); |
| 3221 | return result; |
| 3222 | } |
| 3223 | |
| 3224 | // OutputIterator that records if it was ever assigned to. This |
| 3225 | // allows it to be used with std::set_intersection() to check for |
| 3226 | // intersection rather than computing the intersection. |
| 3227 | struct Check_intersection |
| 3228 | { |
| 3229 | Check_intersection() |
| 3230 | : value_(false) |
| 3231 | {} |
| 3232 | |
| 3233 | bool had_intersection() const |
| 3234 | { return this->value_; } |
| 3235 | |
| 3236 | Check_intersection& operator++() |
| 3237 | { return *this; } |
| 3238 | |
| 3239 | Check_intersection& operator*() |
| 3240 | { return *this; } |
| 3241 | |
| 3242 | template<typename T> |
| 3243 | Check_intersection& operator=(const T&) |
| 3244 | { |
| 3245 | this->value_ = true; |
| 3246 | return *this; |
| 3247 | } |
| 3248 | |
| 3249 | private: |
| 3250 | bool value_; |
| 3251 | }; |
| 3252 | |
| 3253 | // Check candidate_odr_violations_ to find symbols with the same name |
| 3254 | // but apparently different definitions (different source-file/line-no |
| 3255 | // for each line assigned to the first instruction). |
| 3256 | |
| 3257 | void |
| 3258 | Symbol_table::detect_odr_violations(const Task* task, |
| 3259 | const char* output_file_name) const |
| 3260 | { |
| 3261 | for (Odr_map::const_iterator it = candidate_odr_violations_.begin(); |
| 3262 | it != candidate_odr_violations_.end(); |
| 3263 | ++it) |
| 3264 | { |
| 3265 | const char* const symbol_name = it->first; |
| 3266 | |
| 3267 | std::string first_object_name; |
| 3268 | std::vector<std::string> first_object_linenos; |
| 3269 | |
| 3270 | Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator |
| 3271 | locs = it->second.begin(); |
| 3272 | const Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator |
| 3273 | locs_end = it->second.end(); |
| 3274 | for (; locs != locs_end && first_object_linenos.empty(); ++locs) |
| 3275 | { |
| 3276 | // Save the line numbers from the first definition to |
| 3277 | // compare to the other definitions. Ideally, we'd compare |
| 3278 | // every definition to every other, but we don't want to |
| 3279 | // take O(N^2) time to do this. This shortcut may cause |
| 3280 | // false negatives that appear or disappear depending on the |
| 3281 | // link order, but it won't cause false positives. |
| 3282 | first_object_name = locs->object->name(); |
| 3283 | first_object_linenos = this->linenos_from_loc(task, *locs); |
| 3284 | } |
| 3285 | |
| 3286 | // Sort by Odr_violation_compare to make std::set_intersection work. |
| 3287 | std::sort(first_object_linenos.begin(), first_object_linenos.end(), |
| 3288 | Odr_violation_compare()); |
| 3289 | |
| 3290 | for (; locs != locs_end; ++locs) |
| 3291 | { |
| 3292 | std::vector<std::string> linenos = |
| 3293 | this->linenos_from_loc(task, *locs); |
| 3294 | // linenos will be empty if we couldn't parse the debug info. |
| 3295 | if (linenos.empty()) |
| 3296 | continue; |
| 3297 | // Sort by Odr_violation_compare to make std::set_intersection work. |
| 3298 | std::sort(linenos.begin(), linenos.end(), Odr_violation_compare()); |
| 3299 | |
| 3300 | Check_intersection intersection_result = |
| 3301 | std::set_intersection(first_object_linenos.begin(), |
| 3302 | first_object_linenos.end(), |
| 3303 | linenos.begin(), |
| 3304 | linenos.end(), |
| 3305 | Check_intersection(), |
| 3306 | Odr_violation_compare()); |
| 3307 | if (!intersection_result.had_intersection()) |
| 3308 | { |
| 3309 | gold_warning(_("while linking %s: symbol '%s' defined in " |
| 3310 | "multiple places (possible ODR violation):"), |
| 3311 | output_file_name, demangle(symbol_name).c_str()); |
| 3312 | // This only prints one location from each definition, |
| 3313 | // which may not be the location we expect to intersect |
| 3314 | // with another definition. We could print the whole |
| 3315 | // set of locations, but that seems too verbose. |
| 3316 | gold_assert(!first_object_linenos.empty()); |
| 3317 | gold_assert(!linenos.empty()); |
| 3318 | fprintf(stderr, _(" %s from %s\n"), |
| 3319 | first_object_linenos[0].c_str(), |
| 3320 | first_object_name.c_str()); |
| 3321 | fprintf(stderr, _(" %s from %s\n"), |
| 3322 | linenos[0].c_str(), |
| 3323 | locs->object->name().c_str()); |
| 3324 | // Only print one broken pair, to avoid needing to |
| 3325 | // compare against a list of the disjoint definition |
| 3326 | // locations we've found so far. (If we kept comparing |
| 3327 | // against just the first one, we'd get a lot of |
| 3328 | // redundant complaints about the second definition |
| 3329 | // location.) |
| 3330 | break; |
| 3331 | } |
| 3332 | } |
| 3333 | } |
| 3334 | // We only call one_addr2line() in this function, so we can clear its cache. |
| 3335 | Dwarf_line_info::clear_addr2line_cache(); |
| 3336 | } |
| 3337 | |
| 3338 | // Warnings functions. |
| 3339 | |
| 3340 | // Add a new warning. |
| 3341 | |
| 3342 | void |
| 3343 | Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj, |
| 3344 | const std::string& warning) |
| 3345 | { |
| 3346 | name = symtab->canonicalize_name(name); |
| 3347 | this->warnings_[name].set(obj, warning); |
| 3348 | } |
| 3349 | |
| 3350 | // Look through the warnings and mark the symbols for which we should |
| 3351 | // warn. This is called during Layout::finalize when we know the |
| 3352 | // sources for all the symbols. |
| 3353 | |
| 3354 | void |
| 3355 | Warnings::note_warnings(Symbol_table* symtab) |
| 3356 | { |
| 3357 | for (Warning_table::iterator p = this->warnings_.begin(); |
| 3358 | p != this->warnings_.end(); |
| 3359 | ++p) |
| 3360 | { |
| 3361 | Symbol* sym = symtab->lookup(p->first, NULL); |
| 3362 | if (sym != NULL |
| 3363 | && sym->source() == Symbol::FROM_OBJECT |
| 3364 | && sym->object() == p->second.object) |
| 3365 | sym->set_has_warning(); |
| 3366 | } |
| 3367 | } |
| 3368 | |
| 3369 | // Issue a warning. This is called when we see a relocation against a |
| 3370 | // symbol for which has a warning. |
| 3371 | |
| 3372 | template<int size, bool big_endian> |
| 3373 | void |
| 3374 | Warnings::issue_warning(const Symbol* sym, |
| 3375 | const Relocate_info<size, big_endian>* relinfo, |
| 3376 | size_t relnum, off_t reloffset) const |
| 3377 | { |
| 3378 | gold_assert(sym->has_warning()); |
| 3379 | |
| 3380 | // We don't want to issue a warning for a relocation against the |
| 3381 | // symbol in the same object file in which the symbol is defined. |
| 3382 | if (sym->object() == relinfo->object) |
| 3383 | return; |
| 3384 | |
| 3385 | Warning_table::const_iterator p = this->warnings_.find(sym->name()); |
| 3386 | gold_assert(p != this->warnings_.end()); |
| 3387 | gold_warning_at_location(relinfo, relnum, reloffset, |
| 3388 | "%s", p->second.text.c_str()); |
| 3389 | } |
| 3390 | |
| 3391 | // Instantiate the templates we need. We could use the configure |
| 3392 | // script to restrict this to only the ones needed for implemented |
| 3393 | // targets. |
| 3394 | |
| 3395 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
| 3396 | template |
| 3397 | void |
| 3398 | Sized_symbol<32>::allocate_common(Output_data*, Value_type); |
| 3399 | #endif |
| 3400 | |
| 3401 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) |
| 3402 | template |
| 3403 | void |
| 3404 | Sized_symbol<64>::allocate_common(Output_data*, Value_type); |
| 3405 | #endif |
| 3406 | |
| 3407 | #ifdef HAVE_TARGET_32_LITTLE |
| 3408 | template |
| 3409 | void |
| 3410 | Symbol_table::add_from_relobj<32, false>( |
| 3411 | Sized_relobj_file<32, false>* relobj, |
| 3412 | const unsigned char* syms, |
| 3413 | size_t count, |
| 3414 | size_t symndx_offset, |
| 3415 | const char* sym_names, |
| 3416 | size_t sym_name_size, |
| 3417 | Sized_relobj_file<32, false>::Symbols* sympointers, |
| 3418 | size_t* defined); |
| 3419 | #endif |
| 3420 | |
| 3421 | #ifdef HAVE_TARGET_32_BIG |
| 3422 | template |
| 3423 | void |
| 3424 | Symbol_table::add_from_relobj<32, true>( |
| 3425 | Sized_relobj_file<32, true>* relobj, |
| 3426 | const unsigned char* syms, |
| 3427 | size_t count, |
| 3428 | size_t symndx_offset, |
| 3429 | const char* sym_names, |
| 3430 | size_t sym_name_size, |
| 3431 | Sized_relobj_file<32, true>::Symbols* sympointers, |
| 3432 | size_t* defined); |
| 3433 | #endif |
| 3434 | |
| 3435 | #ifdef HAVE_TARGET_64_LITTLE |
| 3436 | template |
| 3437 | void |
| 3438 | Symbol_table::add_from_relobj<64, false>( |
| 3439 | Sized_relobj_file<64, false>* relobj, |
| 3440 | const unsigned char* syms, |
| 3441 | size_t count, |
| 3442 | size_t symndx_offset, |
| 3443 | const char* sym_names, |
| 3444 | size_t sym_name_size, |
| 3445 | Sized_relobj_file<64, false>::Symbols* sympointers, |
| 3446 | size_t* defined); |
| 3447 | #endif |
| 3448 | |
| 3449 | #ifdef HAVE_TARGET_64_BIG |
| 3450 | template |
| 3451 | void |
| 3452 | Symbol_table::add_from_relobj<64, true>( |
| 3453 | Sized_relobj_file<64, true>* relobj, |
| 3454 | const unsigned char* syms, |
| 3455 | size_t count, |
| 3456 | size_t symndx_offset, |
| 3457 | const char* sym_names, |
| 3458 | size_t sym_name_size, |
| 3459 | Sized_relobj_file<64, true>::Symbols* sympointers, |
| 3460 | size_t* defined); |
| 3461 | #endif |
| 3462 | |
| 3463 | #ifdef HAVE_TARGET_32_LITTLE |
| 3464 | template |
| 3465 | Symbol* |
| 3466 | Symbol_table::add_from_pluginobj<32, false>( |
| 3467 | Sized_pluginobj<32, false>* obj, |
| 3468 | const char* name, |
| 3469 | const char* ver, |
| 3470 | elfcpp::Sym<32, false>* sym); |
| 3471 | #endif |
| 3472 | |
| 3473 | #ifdef HAVE_TARGET_32_BIG |
| 3474 | template |
| 3475 | Symbol* |
| 3476 | Symbol_table::add_from_pluginobj<32, true>( |
| 3477 | Sized_pluginobj<32, true>* obj, |
| 3478 | const char* name, |
| 3479 | const char* ver, |
| 3480 | elfcpp::Sym<32, true>* sym); |
| 3481 | #endif |
| 3482 | |
| 3483 | #ifdef HAVE_TARGET_64_LITTLE |
| 3484 | template |
| 3485 | Symbol* |
| 3486 | Symbol_table::add_from_pluginobj<64, false>( |
| 3487 | Sized_pluginobj<64, false>* obj, |
| 3488 | const char* name, |
| 3489 | const char* ver, |
| 3490 | elfcpp::Sym<64, false>* sym); |
| 3491 | #endif |
| 3492 | |
| 3493 | #ifdef HAVE_TARGET_64_BIG |
| 3494 | template |
| 3495 | Symbol* |
| 3496 | Symbol_table::add_from_pluginobj<64, true>( |
| 3497 | Sized_pluginobj<64, true>* obj, |
| 3498 | const char* name, |
| 3499 | const char* ver, |
| 3500 | elfcpp::Sym<64, true>* sym); |
| 3501 | #endif |
| 3502 | |
| 3503 | #ifdef HAVE_TARGET_32_LITTLE |
| 3504 | template |
| 3505 | void |
| 3506 | Symbol_table::add_from_dynobj<32, false>( |
| 3507 | Sized_dynobj<32, false>* dynobj, |
| 3508 | const unsigned char* syms, |
| 3509 | size_t count, |
| 3510 | const char* sym_names, |
| 3511 | size_t sym_name_size, |
| 3512 | const unsigned char* versym, |
| 3513 | size_t versym_size, |
| 3514 | const std::vector<const char*>* version_map, |
| 3515 | Sized_relobj_file<32, false>::Symbols* sympointers, |
| 3516 | size_t* defined); |
| 3517 | #endif |
| 3518 | |
| 3519 | #ifdef HAVE_TARGET_32_BIG |
| 3520 | template |
| 3521 | void |
| 3522 | Symbol_table::add_from_dynobj<32, true>( |
| 3523 | Sized_dynobj<32, true>* dynobj, |
| 3524 | const unsigned char* syms, |
| 3525 | size_t count, |
| 3526 | const char* sym_names, |
| 3527 | size_t sym_name_size, |
| 3528 | const unsigned char* versym, |
| 3529 | size_t versym_size, |
| 3530 | const std::vector<const char*>* version_map, |
| 3531 | Sized_relobj_file<32, true>::Symbols* sympointers, |
| 3532 | size_t* defined); |
| 3533 | #endif |
| 3534 | |
| 3535 | #ifdef HAVE_TARGET_64_LITTLE |
| 3536 | template |
| 3537 | void |
| 3538 | Symbol_table::add_from_dynobj<64, false>( |
| 3539 | Sized_dynobj<64, false>* dynobj, |
| 3540 | const unsigned char* syms, |
| 3541 | size_t count, |
| 3542 | const char* sym_names, |
| 3543 | size_t sym_name_size, |
| 3544 | const unsigned char* versym, |
| 3545 | size_t versym_size, |
| 3546 | const std::vector<const char*>* version_map, |
| 3547 | Sized_relobj_file<64, false>::Symbols* sympointers, |
| 3548 | size_t* defined); |
| 3549 | #endif |
| 3550 | |
| 3551 | #ifdef HAVE_TARGET_64_BIG |
| 3552 | template |
| 3553 | void |
| 3554 | Symbol_table::add_from_dynobj<64, true>( |
| 3555 | Sized_dynobj<64, true>* dynobj, |
| 3556 | const unsigned char* syms, |
| 3557 | size_t count, |
| 3558 | const char* sym_names, |
| 3559 | size_t sym_name_size, |
| 3560 | const unsigned char* versym, |
| 3561 | size_t versym_size, |
| 3562 | const std::vector<const char*>* version_map, |
| 3563 | Sized_relobj_file<64, true>::Symbols* sympointers, |
| 3564 | size_t* defined); |
| 3565 | #endif |
| 3566 | |
| 3567 | #ifdef HAVE_TARGET_32_LITTLE |
| 3568 | template |
| 3569 | Sized_symbol<32>* |
| 3570 | Symbol_table::add_from_incrobj( |
| 3571 | Object* obj, |
| 3572 | const char* name, |
| 3573 | const char* ver, |
| 3574 | elfcpp::Sym<32, false>* sym); |
| 3575 | #endif |
| 3576 | |
| 3577 | #ifdef HAVE_TARGET_32_BIG |
| 3578 | template |
| 3579 | Sized_symbol<32>* |
| 3580 | Symbol_table::add_from_incrobj( |
| 3581 | Object* obj, |
| 3582 | const char* name, |
| 3583 | const char* ver, |
| 3584 | elfcpp::Sym<32, true>* sym); |
| 3585 | #endif |
| 3586 | |
| 3587 | #ifdef HAVE_TARGET_64_LITTLE |
| 3588 | template |
| 3589 | Sized_symbol<64>* |
| 3590 | Symbol_table::add_from_incrobj( |
| 3591 | Object* obj, |
| 3592 | const char* name, |
| 3593 | const char* ver, |
| 3594 | elfcpp::Sym<64, false>* sym); |
| 3595 | #endif |
| 3596 | |
| 3597 | #ifdef HAVE_TARGET_64_BIG |
| 3598 | template |
| 3599 | Sized_symbol<64>* |
| 3600 | Symbol_table::add_from_incrobj( |
| 3601 | Object* obj, |
| 3602 | const char* name, |
| 3603 | const char* ver, |
| 3604 | elfcpp::Sym<64, true>* sym); |
| 3605 | #endif |
| 3606 | |
| 3607 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
| 3608 | template |
| 3609 | void |
| 3610 | Symbol_table::define_with_copy_reloc<32>( |
| 3611 | Sized_symbol<32>* sym, |
| 3612 | Output_data* posd, |
| 3613 | elfcpp::Elf_types<32>::Elf_Addr value); |
| 3614 | #endif |
| 3615 | |
| 3616 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) |
| 3617 | template |
| 3618 | void |
| 3619 | Symbol_table::define_with_copy_reloc<64>( |
| 3620 | Sized_symbol<64>* sym, |
| 3621 | Output_data* posd, |
| 3622 | elfcpp::Elf_types<64>::Elf_Addr value); |
| 3623 | #endif |
| 3624 | |
| 3625 | #ifdef HAVE_TARGET_32_LITTLE |
| 3626 | template |
| 3627 | void |
| 3628 | Warnings::issue_warning<32, false>(const Symbol* sym, |
| 3629 | const Relocate_info<32, false>* relinfo, |
| 3630 | size_t relnum, off_t reloffset) const; |
| 3631 | #endif |
| 3632 | |
| 3633 | #ifdef HAVE_TARGET_32_BIG |
| 3634 | template |
| 3635 | void |
| 3636 | Warnings::issue_warning<32, true>(const Symbol* sym, |
| 3637 | const Relocate_info<32, true>* relinfo, |
| 3638 | size_t relnum, off_t reloffset) const; |
| 3639 | #endif |
| 3640 | |
| 3641 | #ifdef HAVE_TARGET_64_LITTLE |
| 3642 | template |
| 3643 | void |
| 3644 | Warnings::issue_warning<64, false>(const Symbol* sym, |
| 3645 | const Relocate_info<64, false>* relinfo, |
| 3646 | size_t relnum, off_t reloffset) const; |
| 3647 | #endif |
| 3648 | |
| 3649 | #ifdef HAVE_TARGET_64_BIG |
| 3650 | template |
| 3651 | void |
| 3652 | Warnings::issue_warning<64, true>(const Symbol* sym, |
| 3653 | const Relocate_info<64, true>* relinfo, |
| 3654 | size_t relnum, off_t reloffset) const; |
| 3655 | #endif |
| 3656 | |
| 3657 | } // End namespace gold. |