| 1 | // inremental.h -- incremental linking support for gold -*- C++ -*- |
| 2 | |
| 3 | // Copyright (C) 2009-2017 Free Software Foundation, Inc. |
| 4 | // Written by Mikolaj Zalewski <mikolajz@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 | #ifndef GOLD_INCREMENTAL_H |
| 24 | #define GOLD_INCREMENTAL_H |
| 25 | |
| 26 | #include <map> |
| 27 | #include <vector> |
| 28 | |
| 29 | #include "elfcpp_file.h" |
| 30 | #include "stringpool.h" |
| 31 | #include "workqueue.h" |
| 32 | #include "fileread.h" |
| 33 | #include "output.h" |
| 34 | #include "archive.h" |
| 35 | |
| 36 | namespace gold |
| 37 | { |
| 38 | |
| 39 | class Input_argument; |
| 40 | class Incremental_inputs_checker; |
| 41 | class Incremental_script_entry; |
| 42 | class Incremental_object_entry; |
| 43 | class Incremental_dynobj_entry; |
| 44 | class Incremental_archive_entry; |
| 45 | class Incremental_inputs; |
| 46 | class Incremental_binary; |
| 47 | class Incremental_library; |
| 48 | class Object; |
| 49 | |
| 50 | // Incremental input type as stored in .gnu_incremental_inputs. |
| 51 | |
| 52 | enum Incremental_input_type |
| 53 | { |
| 54 | INCREMENTAL_INPUT_OBJECT = 1, |
| 55 | INCREMENTAL_INPUT_ARCHIVE_MEMBER = 2, |
| 56 | INCREMENTAL_INPUT_ARCHIVE = 3, |
| 57 | INCREMENTAL_INPUT_SHARED_LIBRARY = 4, |
| 58 | INCREMENTAL_INPUT_SCRIPT = 5 |
| 59 | }; |
| 60 | |
| 61 | // Incremental input file flags. |
| 62 | // The input file type is stored in the lower eight bits. |
| 63 | |
| 64 | enum Incremental_input_flags |
| 65 | { |
| 66 | INCREMENTAL_INPUT_IN_SYSTEM_DIR = 0x8000, |
| 67 | INCREMENTAL_INPUT_AS_NEEDED = 0x4000 |
| 68 | }; |
| 69 | |
| 70 | // Symbol flags for the incremental symbol table. |
| 71 | // These flags are stored in the top two bits of |
| 72 | // the symbol index field. |
| 73 | |
| 74 | enum Incremental_shlib_symbol_flags |
| 75 | { |
| 76 | // Symbol is defined in this library. |
| 77 | INCREMENTAL_SHLIB_SYM_DEF = 2, |
| 78 | // Symbol is defined in this library, with a COPY relocation. |
| 79 | INCREMENTAL_SHLIB_SYM_COPY = 3 |
| 80 | }; |
| 81 | |
| 82 | static const int INCREMENTAL_SHLIB_SYM_FLAGS_SHIFT = 30; |
| 83 | |
| 84 | // Return TRUE if a section of type SH_TYPE can be updated in place |
| 85 | // during an incremental update. |
| 86 | bool |
| 87 | can_incremental_update(unsigned int sh_type); |
| 88 | |
| 89 | // Create an Incremental_binary object for FILE. Returns NULL is this is not |
| 90 | // possible, e.g. FILE is not an ELF file or has an unsupported target. |
| 91 | |
| 92 | Incremental_binary* |
| 93 | open_incremental_binary(Output_file* file); |
| 94 | |
| 95 | // Base class for recording each input file. |
| 96 | |
| 97 | class Incremental_input_entry |
| 98 | { |
| 99 | public: |
| 100 | Incremental_input_entry(Stringpool::Key filename_key, unsigned int arg_serial, |
| 101 | Timespec mtime) |
| 102 | : filename_key_(filename_key), file_index_(0), offset_(0), info_offset_(0), |
| 103 | arg_serial_(arg_serial), mtime_(mtime), is_in_system_directory_(false), |
| 104 | as_needed_(false) |
| 105 | { } |
| 106 | |
| 107 | virtual |
| 108 | ~Incremental_input_entry() |
| 109 | { } |
| 110 | |
| 111 | // Return the type of input file. |
| 112 | Incremental_input_type |
| 113 | type() const |
| 114 | { return this->do_type(); } |
| 115 | |
| 116 | // Set the index and section offset of this input file entry. |
| 117 | void |
| 118 | set_offset(unsigned int file_index, unsigned int offset) |
| 119 | { |
| 120 | this->file_index_ = file_index; |
| 121 | this->offset_ = offset; |
| 122 | } |
| 123 | |
| 124 | // Set the section offset of the supplemental information for this entry. |
| 125 | void |
| 126 | set_info_offset(unsigned int info_offset) |
| 127 | { this->info_offset_ = info_offset; } |
| 128 | |
| 129 | // Get the index of this input file entry. |
| 130 | unsigned int |
| 131 | get_file_index() const |
| 132 | { return this->file_index_; } |
| 133 | |
| 134 | // Get the section offset of this input file entry. |
| 135 | unsigned int |
| 136 | get_offset() const |
| 137 | { return this->offset_; } |
| 138 | |
| 139 | // Get the section offset of the supplemental information for this entry. |
| 140 | unsigned int |
| 141 | get_info_offset() const |
| 142 | { return this->info_offset_; } |
| 143 | |
| 144 | // Get the stringpool key for the input filename. |
| 145 | Stringpool::Key |
| 146 | get_filename_key() const |
| 147 | { return this->filename_key_; } |
| 148 | |
| 149 | // Get the serial number of the input file. |
| 150 | unsigned int |
| 151 | arg_serial() const |
| 152 | { return this->arg_serial_; } |
| 153 | |
| 154 | // Get the modification time of the input file. |
| 155 | const Timespec& |
| 156 | get_mtime() const |
| 157 | { return this->mtime_; } |
| 158 | |
| 159 | // Record that the file was found in a system directory. |
| 160 | void |
| 161 | set_is_in_system_directory() |
| 162 | { this->is_in_system_directory_ = true; } |
| 163 | |
| 164 | // Return TRUE if the file was found in a system directory. |
| 165 | bool |
| 166 | is_in_system_directory() const |
| 167 | { return this->is_in_system_directory_; } |
| 168 | |
| 169 | // Record that the file was linked with --as-needed. |
| 170 | void |
| 171 | set_as_needed() |
| 172 | { this->as_needed_ = true; } |
| 173 | |
| 174 | // Return TRUE if the file was linked with --as-needed. |
| 175 | bool |
| 176 | as_needed() const |
| 177 | { return this->as_needed_; } |
| 178 | |
| 179 | // Return a pointer to the derived Incremental_script_entry object. |
| 180 | // Return NULL for input entries that are not script files. |
| 181 | Incremental_script_entry* |
| 182 | script_entry() |
| 183 | { return this->do_script_entry(); } |
| 184 | |
| 185 | // Return a pointer to the derived Incremental_object_entry object. |
| 186 | // Return NULL for input entries that are not object files. |
| 187 | Incremental_object_entry* |
| 188 | object_entry() |
| 189 | { return this->do_object_entry(); } |
| 190 | |
| 191 | // Return a pointer to the derived Incremental_dynobj_entry object. |
| 192 | // Return NULL for input entries that are not shared object files. |
| 193 | Incremental_dynobj_entry* |
| 194 | dynobj_entry() |
| 195 | { return this->do_dynobj_entry(); } |
| 196 | |
| 197 | // Return a pointer to the derived Incremental_archive_entry object. |
| 198 | // Return NULL for input entries that are not archive files. |
| 199 | Incremental_archive_entry* |
| 200 | archive_entry() |
| 201 | { return this->do_archive_entry(); } |
| 202 | |
| 203 | protected: |
| 204 | // Return the type of input file. |
| 205 | virtual Incremental_input_type |
| 206 | do_type() const = 0; |
| 207 | |
| 208 | // Return a pointer to the derived Incremental_script_entry object. |
| 209 | // Return NULL for input entries that are not script files. |
| 210 | virtual Incremental_script_entry* |
| 211 | do_script_entry() |
| 212 | { return NULL; } |
| 213 | |
| 214 | // Return a pointer to the derived Incremental_object_entry object. |
| 215 | // Return NULL for input entries that are not object files. |
| 216 | virtual Incremental_object_entry* |
| 217 | do_object_entry() |
| 218 | { return NULL; } |
| 219 | |
| 220 | // Return a pointer to the derived Incremental_dynobj_entry object. |
| 221 | // Return NULL for input entries that are not shared object files. |
| 222 | virtual Incremental_dynobj_entry* |
| 223 | do_dynobj_entry() |
| 224 | { return NULL; } |
| 225 | |
| 226 | // Return a pointer to the derived Incremental_archive_entry object. |
| 227 | // Return NULL for input entries that are not archive files. |
| 228 | virtual Incremental_archive_entry* |
| 229 | do_archive_entry() |
| 230 | { return NULL; } |
| 231 | |
| 232 | private: |
| 233 | // Key of the filename string in the section stringtable. |
| 234 | Stringpool::Key filename_key_; |
| 235 | |
| 236 | // Index of the entry in the output section. |
| 237 | unsigned int file_index_; |
| 238 | |
| 239 | // Offset of the entry in the output section. |
| 240 | unsigned int offset_; |
| 241 | |
| 242 | // Offset of the extra information in the output section. |
| 243 | unsigned int info_offset_; |
| 244 | |
| 245 | // Serial number of the file in the argument list. |
| 246 | unsigned int arg_serial_; |
| 247 | |
| 248 | // Last modification time of the file. |
| 249 | Timespec mtime_; |
| 250 | |
| 251 | // TRUE if the file was found in a system directory. |
| 252 | bool is_in_system_directory_; |
| 253 | |
| 254 | // TRUE if the file was linked with --as-needed. |
| 255 | bool as_needed_; |
| 256 | }; |
| 257 | |
| 258 | // Information about a script input that will persist during the whole linker |
| 259 | // run. Needed only during an incremental build to retrieve the input files |
| 260 | // added by this script. |
| 261 | |
| 262 | class Script_info |
| 263 | { |
| 264 | public: |
| 265 | Script_info(const std::string& filename) |
| 266 | : filename_(filename), input_file_index_(0), |
| 267 | incremental_script_entry_(NULL) |
| 268 | { } |
| 269 | |
| 270 | Script_info(const std::string& filename, unsigned int input_file_index) |
| 271 | : filename_(filename), input_file_index_(input_file_index), |
| 272 | incremental_script_entry_(NULL) |
| 273 | { } |
| 274 | |
| 275 | // Store a pointer to the incremental information for this script. |
| 276 | void |
| 277 | set_incremental_info(Incremental_script_entry* entry) |
| 278 | { this->incremental_script_entry_ = entry; } |
| 279 | |
| 280 | // Return the filename. |
| 281 | const std::string& |
| 282 | filename() const |
| 283 | { return this->filename_; } |
| 284 | |
| 285 | // Return the input file index. |
| 286 | unsigned int |
| 287 | input_file_index() const |
| 288 | { return this->input_file_index_; } |
| 289 | |
| 290 | // Return the pointer to the incremental information for this script. |
| 291 | Incremental_script_entry* |
| 292 | incremental_info() const |
| 293 | { return this->incremental_script_entry_; } |
| 294 | |
| 295 | private: |
| 296 | const std::string filename_; |
| 297 | unsigned int input_file_index_; |
| 298 | Incremental_script_entry* incremental_script_entry_; |
| 299 | }; |
| 300 | |
| 301 | // Class for recording input scripts. |
| 302 | |
| 303 | class Incremental_script_entry : public Incremental_input_entry |
| 304 | { |
| 305 | public: |
| 306 | Incremental_script_entry(Stringpool::Key filename_key, |
| 307 | unsigned int arg_serial, Script_info* /*script*/, |
| 308 | Timespec mtime) |
| 309 | : Incremental_input_entry(filename_key, arg_serial, mtime), |
| 310 | objects_() |
| 311 | { } |
| 312 | |
| 313 | // Add a member object to the archive. |
| 314 | void |
| 315 | add_object(Incremental_input_entry* obj_entry) |
| 316 | { |
| 317 | this->objects_.push_back(obj_entry); |
| 318 | } |
| 319 | |
| 320 | // Return the number of objects included by this script. |
| 321 | unsigned int |
| 322 | get_object_count() |
| 323 | { return this->objects_.size(); } |
| 324 | |
| 325 | // Return the Nth object. |
| 326 | Incremental_input_entry* |
| 327 | get_object(unsigned int n) |
| 328 | { |
| 329 | gold_assert(n < this->objects_.size()); |
| 330 | return this->objects_[n]; |
| 331 | } |
| 332 | |
| 333 | protected: |
| 334 | virtual Incremental_input_type |
| 335 | do_type() const |
| 336 | { return INCREMENTAL_INPUT_SCRIPT; } |
| 337 | |
| 338 | // Return a pointer to the derived Incremental_script_entry object. |
| 339 | virtual Incremental_script_entry* |
| 340 | do_script_entry() |
| 341 | { return this; } |
| 342 | |
| 343 | private: |
| 344 | // Objects that have been included by this script. |
| 345 | std::vector<Incremental_input_entry*> objects_; |
| 346 | }; |
| 347 | |
| 348 | // Class for recording input object files. |
| 349 | |
| 350 | class Incremental_object_entry : public Incremental_input_entry |
| 351 | { |
| 352 | public: |
| 353 | Incremental_object_entry(Stringpool::Key filename_key, Object* obj, |
| 354 | unsigned int arg_serial, Timespec mtime) |
| 355 | : Incremental_input_entry(filename_key, arg_serial, mtime), obj_(obj), |
| 356 | is_member_(false), sections_(), groups_() |
| 357 | { this->sections_.reserve(obj->shnum()); } |
| 358 | |
| 359 | // Get the object. |
| 360 | Object* |
| 361 | object() const |
| 362 | { return this->obj_; } |
| 363 | |
| 364 | // Record that this object is an archive member. |
| 365 | void |
| 366 | set_is_member() |
| 367 | { this->is_member_ = true; } |
| 368 | |
| 369 | // Return true if this object is an archive member. |
| 370 | bool |
| 371 | is_member() const |
| 372 | { return this->is_member_; } |
| 373 | |
| 374 | // Add an input section. |
| 375 | void |
| 376 | add_input_section(unsigned int shndx, Stringpool::Key name_key, off_t sh_size) |
| 377 | { this->sections_.push_back(Input_section(shndx, name_key, sh_size)); } |
| 378 | |
| 379 | // Return the number of input sections in this object. |
| 380 | unsigned int |
| 381 | get_input_section_count() const |
| 382 | { return this->sections_.size(); } |
| 383 | |
| 384 | // Return the input section index for the Nth input section. |
| 385 | Stringpool::Key |
| 386 | get_input_section_index(unsigned int n) const |
| 387 | { return this->sections_[n].shndx_; } |
| 388 | |
| 389 | // Return the stringpool key of the Nth input section. |
| 390 | Stringpool::Key |
| 391 | get_input_section_name_key(unsigned int n) const |
| 392 | { return this->sections_[n].name_key_; } |
| 393 | |
| 394 | // Return the size of the Nth input section. |
| 395 | off_t |
| 396 | get_input_section_size(unsigned int n) const |
| 397 | { return this->sections_[n].sh_size_; } |
| 398 | |
| 399 | // Add a kept COMDAT group. |
| 400 | void |
| 401 | add_comdat_group(Stringpool::Key signature_key) |
| 402 | { this->groups_.push_back(signature_key); } |
| 403 | |
| 404 | // Return the number of COMDAT groups. |
| 405 | unsigned int |
| 406 | get_comdat_group_count() const |
| 407 | { return this->groups_.size(); } |
| 408 | |
| 409 | // Return the stringpool key for the signature of the Nth comdat group. |
| 410 | Stringpool::Key |
| 411 | get_comdat_signature_key(unsigned int n) const |
| 412 | { return this->groups_[n]; } |
| 413 | |
| 414 | protected: |
| 415 | virtual Incremental_input_type |
| 416 | do_type() const |
| 417 | { |
| 418 | return (this->is_member_ |
| 419 | ? INCREMENTAL_INPUT_ARCHIVE_MEMBER |
| 420 | : INCREMENTAL_INPUT_OBJECT); |
| 421 | } |
| 422 | |
| 423 | // Return a pointer to the derived Incremental_object_entry object. |
| 424 | virtual Incremental_object_entry* |
| 425 | do_object_entry() |
| 426 | { return this; } |
| 427 | |
| 428 | private: |
| 429 | // The object file itself. |
| 430 | Object* obj_; |
| 431 | |
| 432 | // Whether this object is an archive member. |
| 433 | bool is_member_; |
| 434 | |
| 435 | // Input sections. |
| 436 | struct Input_section |
| 437 | { |
| 438 | Input_section(unsigned int shndx, Stringpool::Key name_key, off_t sh_size) |
| 439 | : shndx_(shndx), name_key_(name_key), sh_size_(sh_size) |
| 440 | { } |
| 441 | unsigned int shndx_; |
| 442 | Stringpool::Key name_key_; |
| 443 | off_t sh_size_; |
| 444 | }; |
| 445 | std::vector<Input_section> sections_; |
| 446 | |
| 447 | // COMDAT groups. |
| 448 | std::vector<Stringpool::Key> groups_; |
| 449 | }; |
| 450 | |
| 451 | // Class for recording shared library input files. |
| 452 | |
| 453 | class Incremental_dynobj_entry : public Incremental_input_entry |
| 454 | { |
| 455 | public: |
| 456 | Incremental_dynobj_entry(Stringpool::Key filename_key, |
| 457 | Stringpool::Key soname_key, Object* obj, |
| 458 | unsigned int arg_serial, Timespec mtime) |
| 459 | : Incremental_input_entry(filename_key, arg_serial, mtime), |
| 460 | soname_key_(soname_key), obj_(obj) |
| 461 | { } |
| 462 | |
| 463 | // Get the object. |
| 464 | Object* |
| 465 | object() const |
| 466 | { return this->obj_; } |
| 467 | |
| 468 | // Get the stringpool key for the soname. |
| 469 | Stringpool::Key |
| 470 | get_soname_key() const |
| 471 | { return this->soname_key_; } |
| 472 | |
| 473 | protected: |
| 474 | virtual Incremental_input_type |
| 475 | do_type() const |
| 476 | { return INCREMENTAL_INPUT_SHARED_LIBRARY; } |
| 477 | |
| 478 | // Return a pointer to the derived Incremental_dynobj_entry object. |
| 479 | virtual Incremental_dynobj_entry* |
| 480 | do_dynobj_entry() |
| 481 | { return this; } |
| 482 | |
| 483 | private: |
| 484 | // Key of the soname string in the section stringtable. |
| 485 | Stringpool::Key soname_key_; |
| 486 | |
| 487 | // The object file itself. |
| 488 | Object* obj_; |
| 489 | }; |
| 490 | |
| 491 | // Class for recording archive library input files. |
| 492 | |
| 493 | class Incremental_archive_entry : public Incremental_input_entry |
| 494 | { |
| 495 | public: |
| 496 | Incremental_archive_entry(Stringpool::Key filename_key, |
| 497 | unsigned int arg_serial, Timespec mtime) |
| 498 | : Incremental_input_entry(filename_key, arg_serial, mtime), members_(), |
| 499 | unused_syms_() |
| 500 | { } |
| 501 | |
| 502 | // Add a member object to the archive. |
| 503 | void |
| 504 | add_object(Incremental_object_entry* obj_entry) |
| 505 | { |
| 506 | this->members_.push_back(obj_entry); |
| 507 | obj_entry->set_is_member(); |
| 508 | } |
| 509 | |
| 510 | // Add an unused global symbol to the archive. |
| 511 | void |
| 512 | add_unused_global_symbol(Stringpool::Key symbol_key) |
| 513 | { this->unused_syms_.push_back(symbol_key); } |
| 514 | |
| 515 | // Return the number of member objects included in the link. |
| 516 | unsigned int |
| 517 | get_member_count() |
| 518 | { return this->members_.size(); } |
| 519 | |
| 520 | // Return the Nth member object. |
| 521 | Incremental_object_entry* |
| 522 | get_member(unsigned int n) |
| 523 | { return this->members_[n]; } |
| 524 | |
| 525 | // Return the number of unused global symbols in this archive. |
| 526 | unsigned int |
| 527 | get_unused_global_symbol_count() |
| 528 | { return this->unused_syms_.size(); } |
| 529 | |
| 530 | // Return the Nth unused global symbol. |
| 531 | Stringpool::Key |
| 532 | get_unused_global_symbol(unsigned int n) |
| 533 | { return this->unused_syms_[n]; } |
| 534 | |
| 535 | protected: |
| 536 | virtual Incremental_input_type |
| 537 | do_type() const |
| 538 | { return INCREMENTAL_INPUT_ARCHIVE; } |
| 539 | |
| 540 | // Return a pointer to the derived Incremental_archive_entry object. |
| 541 | virtual Incremental_archive_entry* |
| 542 | do_archive_entry() |
| 543 | { return this; } |
| 544 | |
| 545 | private: |
| 546 | // Members of the archive that have been included in the link. |
| 547 | std::vector<Incremental_object_entry*> members_; |
| 548 | |
| 549 | // Unused global symbols from this archive. |
| 550 | std::vector<Stringpool::Key> unused_syms_; |
| 551 | }; |
| 552 | |
| 553 | // This class contains the information needed during an incremental |
| 554 | // build about the inputs necessary to build the .gnu_incremental_inputs. |
| 555 | |
| 556 | class Incremental_inputs |
| 557 | { |
| 558 | public: |
| 559 | typedef std::vector<Incremental_input_entry*> Input_list; |
| 560 | |
| 561 | Incremental_inputs() |
| 562 | : inputs_(), command_line_(), command_line_key_(0), |
| 563 | strtab_(new Stringpool()), current_object_(NULL), |
| 564 | current_object_entry_(NULL), inputs_section_(NULL), |
| 565 | symtab_section_(NULL), relocs_section_(NULL), |
| 566 | reloc_count_(0) |
| 567 | { } |
| 568 | |
| 569 | ~Incremental_inputs() { delete this->strtab_; } |
| 570 | |
| 571 | // Record the command line. |
| 572 | void |
| 573 | report_command_line(int argc, const char* const* argv); |
| 574 | |
| 575 | // Record the initial info for archive file ARCHIVE. |
| 576 | void |
| 577 | report_archive_begin(Library_base* arch, unsigned int arg_serial, |
| 578 | Script_info* script_info); |
| 579 | |
| 580 | // Record the final info for archive file ARCHIVE. |
| 581 | void |
| 582 | report_archive_end(Library_base* arch); |
| 583 | |
| 584 | // Record the info for object file OBJ. If ARCH is not NULL, |
| 585 | // attach the object file to the archive. |
| 586 | void |
| 587 | report_object(Object* obj, unsigned int arg_serial, Library_base* arch, |
| 588 | Script_info* script_info); |
| 589 | |
| 590 | // Record an input section belonging to object file OBJ. |
| 591 | void |
| 592 | report_input_section(Object* obj, unsigned int shndx, const char* name, |
| 593 | off_t sh_size); |
| 594 | |
| 595 | // Record a kept COMDAT group belonging to object file OBJ. |
| 596 | void |
| 597 | report_comdat_group(Object* obj, const char* name); |
| 598 | |
| 599 | // Record the info for input script SCRIPT. |
| 600 | void |
| 601 | report_script(Script_info* script, unsigned int arg_serial, |
| 602 | Timespec mtime); |
| 603 | |
| 604 | // Return the running count of incremental relocations. |
| 605 | unsigned int |
| 606 | get_reloc_count() const |
| 607 | { return this->reloc_count_; } |
| 608 | |
| 609 | // Update the running count of incremental relocations. |
| 610 | void |
| 611 | set_reloc_count(unsigned int count) |
| 612 | { this->reloc_count_ = count; } |
| 613 | |
| 614 | // Prepare for layout. Called from Layout::finalize. |
| 615 | void |
| 616 | finalize(); |
| 617 | |
| 618 | // Create the .gnu_incremental_inputs and related sections. |
| 619 | void |
| 620 | create_data_sections(Symbol_table* symtab); |
| 621 | |
| 622 | // Return the .gnu_incremental_inputs section. |
| 623 | Output_section_data* |
| 624 | inputs_section() const |
| 625 | { return this->inputs_section_; } |
| 626 | |
| 627 | // Return the .gnu_incremental_symtab section. |
| 628 | Output_data_space* |
| 629 | symtab_section() const |
| 630 | { return this->symtab_section_; } |
| 631 | |
| 632 | // Return the .gnu_incremental_relocs section. |
| 633 | Output_data_space* |
| 634 | relocs_section() const |
| 635 | { return this->relocs_section_; } |
| 636 | |
| 637 | // Return the .gnu_incremental_got_plt section. |
| 638 | Output_data_space* |
| 639 | got_plt_section() const |
| 640 | { return this->got_plt_section_; } |
| 641 | |
| 642 | // Return the .gnu_incremental_strtab stringpool. |
| 643 | Stringpool* |
| 644 | get_stringpool() const |
| 645 | { return this->strtab_; } |
| 646 | |
| 647 | // Return the canonical form of the command line, as will be stored in |
| 648 | // .gnu_incremental_strtab. |
| 649 | const std::string& |
| 650 | command_line() const |
| 651 | { return this->command_line_; } |
| 652 | |
| 653 | // Return the stringpool key of the command line. |
| 654 | Stringpool::Key |
| 655 | command_line_key() const |
| 656 | { return this->command_line_key_; } |
| 657 | |
| 658 | // Return the number of input files. |
| 659 | int |
| 660 | input_file_count() const |
| 661 | { return this->inputs_.size(); } |
| 662 | |
| 663 | // Return the input files. |
| 664 | const Input_list& |
| 665 | input_files() const |
| 666 | { return this->inputs_; } |
| 667 | |
| 668 | // Return the sh_entsize value for the .gnu_incremental_relocs section. |
| 669 | unsigned int |
| 670 | relocs_entsize() const; |
| 671 | |
| 672 | private: |
| 673 | // The list of input files. |
| 674 | Input_list inputs_; |
| 675 | |
| 676 | // Canonical form of the command line, as will be stored in |
| 677 | // .gnu_incremental_strtab. |
| 678 | std::string command_line_; |
| 679 | |
| 680 | // The key of the command line string in the string pool. |
| 681 | Stringpool::Key command_line_key_; |
| 682 | |
| 683 | // The .gnu_incremental_strtab string pool associated with the |
| 684 | // .gnu_incremental_inputs. |
| 685 | Stringpool* strtab_; |
| 686 | |
| 687 | // Keep track of the object currently being processed. |
| 688 | Object* current_object_; |
| 689 | Incremental_object_entry* current_object_entry_; |
| 690 | |
| 691 | // The .gnu_incremental_inputs section. |
| 692 | Output_section_data* inputs_section_; |
| 693 | |
| 694 | // The .gnu_incremental_symtab section. |
| 695 | Output_data_space* symtab_section_; |
| 696 | |
| 697 | // The .gnu_incremental_relocs section. |
| 698 | Output_data_space* relocs_section_; |
| 699 | |
| 700 | // The .gnu_incremental_got_plt section. |
| 701 | Output_data_space* got_plt_section_; |
| 702 | |
| 703 | // Total count of incremental relocations. Updated during Scan_relocs |
| 704 | // phase at the completion of each object file. |
| 705 | unsigned int reloc_count_; |
| 706 | }; |
| 707 | |
| 708 | // Reader class for global symbol info from an object file entry in |
| 709 | // the .gnu_incremental_inputs section. |
| 710 | |
| 711 | template<bool big_endian> |
| 712 | class Incremental_global_symbol_reader |
| 713 | { |
| 714 | private: |
| 715 | typedef elfcpp::Swap<32, big_endian> Swap32; |
| 716 | |
| 717 | public: |
| 718 | Incremental_global_symbol_reader(const unsigned char* p) |
| 719 | : p_(p) |
| 720 | { } |
| 721 | |
| 722 | unsigned int |
| 723 | output_symndx() const |
| 724 | { return Swap32::readval(this->p_); } |
| 725 | |
| 726 | unsigned int |
| 727 | shndx() const |
| 728 | { return Swap32::readval(this->p_ + 4); } |
| 729 | |
| 730 | unsigned int |
| 731 | next_offset() const |
| 732 | { return Swap32::readval(this->p_ + 8); } |
| 733 | |
| 734 | unsigned int |
| 735 | reloc_count() const |
| 736 | { return Swap32::readval(this->p_ + 12); } |
| 737 | |
| 738 | unsigned int |
| 739 | reloc_offset() const |
| 740 | { return Swap32::readval(this->p_ + 16); } |
| 741 | |
| 742 | private: |
| 743 | // Base address of the symbol entry. |
| 744 | const unsigned char* p_; |
| 745 | }; |
| 746 | |
| 747 | // Reader class for .gnu_incremental_inputs section. |
| 748 | |
| 749 | template<int size, bool big_endian> |
| 750 | class Incremental_inputs_reader |
| 751 | { |
| 752 | private: |
| 753 | typedef elfcpp::Swap<size, big_endian> Swap; |
| 754 | typedef elfcpp::Swap<16, big_endian> Swap16; |
| 755 | typedef elfcpp::Swap<32, big_endian> Swap32; |
| 756 | typedef elfcpp::Swap<64, big_endian> Swap64; |
| 757 | |
| 758 | public: |
| 759 | // Size of the .gnu_incremental_inputs header. |
| 760 | // (3 x 4-byte fields, plus 4 bytes padding.) |
| 761 | static const unsigned int header_size = 16; |
| 762 | // Size of an input file entry. |
| 763 | // (2 x 4-byte fields, 1 x 12-byte field, 2 x 2-byte fields.) |
| 764 | static const unsigned int input_entry_size = 24; |
| 765 | // Size of the first part of the supplemental info block for |
| 766 | // relocatable objects and archive members. |
| 767 | // (7 x 4-byte fields, plus 4 bytes padding.) |
| 768 | static const unsigned int object_info_size = 32; |
| 769 | // Size of an input section entry. |
| 770 | // (2 x 4-byte fields, 2 x address-sized fields.) |
| 771 | static const unsigned int input_section_entry_size = 8 + 2 * size / 8; |
| 772 | // Size of a global symbol entry in the supplemental info block. |
| 773 | // (5 x 4-byte fields.) |
| 774 | static const unsigned int global_sym_entry_size = 20; |
| 775 | |
| 776 | Incremental_inputs_reader() |
| 777 | : p_(NULL), strtab_(NULL, 0), input_file_count_(0) |
| 778 | { } |
| 779 | |
| 780 | Incremental_inputs_reader(const unsigned char* p, |
| 781 | const elfcpp::Elf_strtab& strtab) |
| 782 | : p_(p), strtab_(strtab) |
| 783 | { this->input_file_count_ = Swap32::readval(this->p_ + 4); } |
| 784 | |
| 785 | // Return the version number. |
| 786 | unsigned int |
| 787 | version() const |
| 788 | { return Swap32::readval(this->p_); } |
| 789 | |
| 790 | // Return the count of input file entries. |
| 791 | unsigned int |
| 792 | input_file_count() const |
| 793 | { return this->input_file_count_; } |
| 794 | |
| 795 | // Return the command line. |
| 796 | const char* |
| 797 | command_line() const |
| 798 | { |
| 799 | unsigned int offset = Swap32::readval(this->p_ + 8); |
| 800 | return this->get_string(offset); |
| 801 | } |
| 802 | |
| 803 | // Reader class for an input file entry and its supplemental info. |
| 804 | class Incremental_input_entry_reader |
| 805 | { |
| 806 | private: |
| 807 | static const unsigned int object_info_size = |
| 808 | Incremental_inputs_reader<size, big_endian>::object_info_size; |
| 809 | static const unsigned int input_section_entry_size = |
| 810 | Incremental_inputs_reader<size, big_endian>::input_section_entry_size; |
| 811 | static const unsigned int global_sym_entry_size = |
| 812 | Incremental_inputs_reader<size, big_endian>::global_sym_entry_size; |
| 813 | |
| 814 | public: |
| 815 | Incremental_input_entry_reader(const Incremental_inputs_reader* inputs, |
| 816 | unsigned int offset) |
| 817 | : inputs_(inputs), offset_(offset) |
| 818 | { |
| 819 | this->info_offset_ = Swap32::readval(inputs->p_ + offset + 4); |
| 820 | this->flags_ = Swap16::readval(this->inputs_->p_ + offset + 20); |
| 821 | } |
| 822 | |
| 823 | // Return the filename. |
| 824 | const char* |
| 825 | filename() const |
| 826 | { |
| 827 | unsigned int offset = Swap32::readval(this->inputs_->p_ + this->offset_); |
| 828 | return this->inputs_->get_string(offset); |
| 829 | } |
| 830 | |
| 831 | // Return the argument serial number. |
| 832 | unsigned int |
| 833 | arg_serial() const |
| 834 | { |
| 835 | return Swap16::readval(this->inputs_->p_ + this->offset_ + 22); |
| 836 | } |
| 837 | |
| 838 | // Return the timestamp. |
| 839 | Timespec |
| 840 | get_mtime() const |
| 841 | { |
| 842 | Timespec t; |
| 843 | const unsigned char* p = this->inputs_->p_ + this->offset_ + 8; |
| 844 | t.seconds = Swap64::readval(p); |
| 845 | t.nanoseconds = Swap32::readval(p+8); |
| 846 | return t; |
| 847 | } |
| 848 | |
| 849 | // Return the type of input file. |
| 850 | Incremental_input_type |
| 851 | type() const |
| 852 | { return static_cast<Incremental_input_type>(this->flags_ & 0xff); } |
| 853 | |
| 854 | // Return TRUE if the file was found in a system directory. |
| 855 | bool |
| 856 | is_in_system_directory() const |
| 857 | { return (this->flags_ & INCREMENTAL_INPUT_IN_SYSTEM_DIR) != 0; } |
| 858 | |
| 859 | // Return TRUE if the file was linked with --as-needed. |
| 860 | bool |
| 861 | as_needed() const |
| 862 | { return (this->flags_ & INCREMENTAL_INPUT_AS_NEEDED) != 0; } |
| 863 | |
| 864 | // Return the input section count -- for objects only. |
| 865 | unsigned int |
| 866 | get_input_section_count() const |
| 867 | { |
| 868 | gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| 869 | || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER); |
| 870 | return Swap32::readval(this->inputs_->p_ + this->info_offset_); |
| 871 | } |
| 872 | |
| 873 | // Return the soname -- for shared libraries only. |
| 874 | const char* |
| 875 | get_soname() const |
| 876 | { |
| 877 | gold_assert(this->type() == INCREMENTAL_INPUT_SHARED_LIBRARY); |
| 878 | unsigned int offset = Swap32::readval(this->inputs_->p_ |
| 879 | + this->info_offset_); |
| 880 | return this->inputs_->get_string(offset); |
| 881 | } |
| 882 | |
| 883 | // Return the offset of the supplemental info for symbol SYMNDX -- |
| 884 | // for objects only. |
| 885 | unsigned int |
| 886 | get_symbol_offset(unsigned int symndx) const |
| 887 | { |
| 888 | gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| 889 | || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER); |
| 890 | |
| 891 | unsigned int section_count = this->get_input_section_count(); |
| 892 | return (this->info_offset_ |
| 893 | + this->object_info_size |
| 894 | + section_count * this->input_section_entry_size |
| 895 | + symndx * this->global_sym_entry_size); |
| 896 | } |
| 897 | |
| 898 | // Return the global symbol count -- for objects & shared libraries only. |
| 899 | unsigned int |
| 900 | get_global_symbol_count() const |
| 901 | { |
| 902 | gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| 903 | || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER |
| 904 | || this->type() == INCREMENTAL_INPUT_SHARED_LIBRARY); |
| 905 | return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 4); |
| 906 | } |
| 907 | |
| 908 | // Return the offset of the first local symbol -- for objects only. |
| 909 | unsigned int |
| 910 | get_local_symbol_offset() const |
| 911 | { |
| 912 | gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| 913 | || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER); |
| 914 | |
| 915 | return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 8); |
| 916 | } |
| 917 | |
| 918 | // Return the local symbol count -- for objects only. |
| 919 | unsigned int |
| 920 | get_local_symbol_count() const |
| 921 | { |
| 922 | gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| 923 | || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER); |
| 924 | |
| 925 | return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 12); |
| 926 | } |
| 927 | |
| 928 | // Return the index of the first dynamic relocation -- for objects only. |
| 929 | unsigned int |
| 930 | get_first_dyn_reloc() const |
| 931 | { |
| 932 | gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| 933 | || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER); |
| 934 | |
| 935 | return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 16); |
| 936 | } |
| 937 | |
| 938 | // Return the dynamic relocation count -- for objects only. |
| 939 | unsigned int |
| 940 | get_dyn_reloc_count() const |
| 941 | { |
| 942 | gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| 943 | || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER); |
| 944 | |
| 945 | return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 20); |
| 946 | } |
| 947 | |
| 948 | // Return the COMDAT group count -- for objects only. |
| 949 | unsigned int |
| 950 | get_comdat_group_count() const |
| 951 | { |
| 952 | gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| 953 | || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER); |
| 954 | |
| 955 | return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 24); |
| 956 | } |
| 957 | |
| 958 | // Return the object count -- for scripts only. |
| 959 | unsigned int |
| 960 | get_object_count() const |
| 961 | { |
| 962 | gold_assert(this->type() == INCREMENTAL_INPUT_SCRIPT); |
| 963 | return Swap32::readval(this->inputs_->p_ + this->info_offset_); |
| 964 | } |
| 965 | |
| 966 | // Return the input file offset for object N -- for scripts only. |
| 967 | unsigned int |
| 968 | get_object_offset(unsigned int n) const |
| 969 | { |
| 970 | gold_assert(this->type() == INCREMENTAL_INPUT_SCRIPT); |
| 971 | return Swap32::readval(this->inputs_->p_ + this->info_offset_ |
| 972 | + 4 + n * 4); |
| 973 | } |
| 974 | |
| 975 | // Return the member count -- for archives only. |
| 976 | unsigned int |
| 977 | get_member_count() const |
| 978 | { |
| 979 | gold_assert(this->type() == INCREMENTAL_INPUT_ARCHIVE); |
| 980 | return Swap32::readval(this->inputs_->p_ + this->info_offset_); |
| 981 | } |
| 982 | |
| 983 | // Return the unused symbol count -- for archives only. |
| 984 | unsigned int |
| 985 | get_unused_symbol_count() const |
| 986 | { |
| 987 | gold_assert(this->type() == INCREMENTAL_INPUT_ARCHIVE); |
| 988 | return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 4); |
| 989 | } |
| 990 | |
| 991 | // Return the input file offset for archive member N -- for archives only. |
| 992 | unsigned int |
| 993 | get_member_offset(unsigned int n) const |
| 994 | { |
| 995 | gold_assert(this->type() == INCREMENTAL_INPUT_ARCHIVE); |
| 996 | return Swap32::readval(this->inputs_->p_ + this->info_offset_ |
| 997 | + 8 + n * 4); |
| 998 | } |
| 999 | |
| 1000 | // Return the Nth unused global symbol -- for archives only. |
| 1001 | const char* |
| 1002 | get_unused_symbol(unsigned int n) const |
| 1003 | { |
| 1004 | gold_assert(this->type() == INCREMENTAL_INPUT_ARCHIVE); |
| 1005 | unsigned int member_count = this->get_member_count(); |
| 1006 | unsigned int offset = Swap32::readval(this->inputs_->p_ |
| 1007 | + this->info_offset_ + 8 |
| 1008 | + member_count * 4 |
| 1009 | + n * 4); |
| 1010 | return this->inputs_->get_string(offset); |
| 1011 | } |
| 1012 | |
| 1013 | // Information about an input section. |
| 1014 | struct Input_section_info |
| 1015 | { |
| 1016 | const char* name; |
| 1017 | unsigned int output_shndx; |
| 1018 | off_t sh_offset; |
| 1019 | off_t sh_size; |
| 1020 | }; |
| 1021 | |
| 1022 | // Return info about the Nth input section -- for objects only. |
| 1023 | Input_section_info |
| 1024 | get_input_section(unsigned int n) const |
| 1025 | { |
| 1026 | Input_section_info info; |
| 1027 | const unsigned char* p = (this->inputs_->p_ |
| 1028 | + this->info_offset_ |
| 1029 | + this->object_info_size |
| 1030 | + n * this->input_section_entry_size); |
| 1031 | unsigned int name_offset = Swap32::readval(p); |
| 1032 | info.name = this->inputs_->get_string(name_offset); |
| 1033 | info.output_shndx = Swap32::readval(p + 4); |
| 1034 | info.sh_offset = Swap::readval(p + 8); |
| 1035 | info.sh_size = Swap::readval(p + 8 + size / 8); |
| 1036 | return info; |
| 1037 | } |
| 1038 | |
| 1039 | // Return info about the Nth global symbol -- for objects only. |
| 1040 | Incremental_global_symbol_reader<big_endian> |
| 1041 | get_global_symbol_reader(unsigned int n) const |
| 1042 | { |
| 1043 | gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| 1044 | || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER); |
| 1045 | unsigned int section_count = this->get_input_section_count(); |
| 1046 | const unsigned char* p = (this->inputs_->p_ |
| 1047 | + this->info_offset_ |
| 1048 | + this->object_info_size |
| 1049 | + section_count * this->input_section_entry_size |
| 1050 | + n * this->global_sym_entry_size); |
| 1051 | return Incremental_global_symbol_reader<big_endian>(p); |
| 1052 | } |
| 1053 | |
| 1054 | // Return the signature of the Nth comdat group -- for objects only. |
| 1055 | const char* |
| 1056 | get_comdat_group_signature(unsigned int n) const |
| 1057 | { |
| 1058 | unsigned int section_count = this->get_input_section_count(); |
| 1059 | unsigned int symbol_count = this->get_global_symbol_count(); |
| 1060 | const unsigned char* p = (this->inputs_->p_ |
| 1061 | + this->info_offset_ |
| 1062 | + this->object_info_size |
| 1063 | + section_count * this->input_section_entry_size |
| 1064 | + symbol_count * this->global_sym_entry_size |
| 1065 | + n * 4); |
| 1066 | unsigned int name_offset = Swap32::readval(p); |
| 1067 | return this->inputs_->get_string(name_offset); |
| 1068 | } |
| 1069 | |
| 1070 | // Return the output symbol index for the Nth global symbol -- for shared |
| 1071 | // libraries only. Sets *IS_DEF to TRUE if the symbol is defined in this |
| 1072 | // input file. Sets *IS_COPY to TRUE if the symbol was copied from this |
| 1073 | // input file with a COPY relocation. |
| 1074 | unsigned int |
| 1075 | get_output_symbol_index(unsigned int n, bool* is_def, bool* is_copy) |
| 1076 | { |
| 1077 | gold_assert(this->type() == INCREMENTAL_INPUT_SHARED_LIBRARY); |
| 1078 | const unsigned char* p = (this->inputs_->p_ |
| 1079 | + this->info_offset_ + 8 |
| 1080 | + n * 4); |
| 1081 | unsigned int output_symndx = Swap32::readval(p); |
| 1082 | unsigned int flags = output_symndx >> INCREMENTAL_SHLIB_SYM_FLAGS_SHIFT; |
| 1083 | output_symndx &= ((1U << INCREMENTAL_SHLIB_SYM_FLAGS_SHIFT) - 1); |
| 1084 | switch (flags) |
| 1085 | { |
| 1086 | case INCREMENTAL_SHLIB_SYM_DEF: |
| 1087 | *is_def = true; |
| 1088 | *is_copy = false; |
| 1089 | break; |
| 1090 | case INCREMENTAL_SHLIB_SYM_COPY: |
| 1091 | *is_def = true; |
| 1092 | *is_copy = true; |
| 1093 | break; |
| 1094 | default: |
| 1095 | *is_def = false; |
| 1096 | *is_copy = false; |
| 1097 | } |
| 1098 | return output_symndx; |
| 1099 | } |
| 1100 | |
| 1101 | private: |
| 1102 | // The reader instance for the containing section. |
| 1103 | const Incremental_inputs_reader* inputs_; |
| 1104 | // The flags, including the type of input file. |
| 1105 | unsigned int flags_; |
| 1106 | // Section offset to the input file entry. |
| 1107 | unsigned int offset_; |
| 1108 | // Section offset to the supplemental info for the input file. |
| 1109 | unsigned int info_offset_; |
| 1110 | }; |
| 1111 | |
| 1112 | // Return the offset of an input file entry given its index N. |
| 1113 | unsigned int |
| 1114 | input_file_offset(unsigned int n) const |
| 1115 | { |
| 1116 | gold_assert(n < this->input_file_count_); |
| 1117 | return this->header_size + n * this->input_entry_size; |
| 1118 | } |
| 1119 | |
| 1120 | // Return the index of an input file entry given its OFFSET. |
| 1121 | unsigned int |
| 1122 | input_file_index(unsigned int offset) const |
| 1123 | { |
| 1124 | int n = ((offset - this->header_size) / this->input_entry_size); |
| 1125 | gold_assert(input_file_offset(n) == offset); |
| 1126 | return n; |
| 1127 | } |
| 1128 | |
| 1129 | // Return a reader for the Nth input file entry. |
| 1130 | Incremental_input_entry_reader |
| 1131 | input_file(unsigned int n) const |
| 1132 | { return Incremental_input_entry_reader(this, this->input_file_offset(n)); } |
| 1133 | |
| 1134 | // Return a reader for the input file entry at OFFSET. |
| 1135 | Incremental_input_entry_reader |
| 1136 | input_file_at_offset(unsigned int offset) const |
| 1137 | { |
| 1138 | gold_assert(offset < (this->header_size |
| 1139 | + this->input_file_count_ * this->input_entry_size)); |
| 1140 | return Incremental_input_entry_reader(this, offset); |
| 1141 | } |
| 1142 | |
| 1143 | // Return a reader for the global symbol info at OFFSET. |
| 1144 | Incremental_global_symbol_reader<big_endian> |
| 1145 | global_symbol_reader_at_offset(unsigned int offset) const |
| 1146 | { |
| 1147 | const unsigned char* p = this->p_ + offset; |
| 1148 | return Incremental_global_symbol_reader<big_endian>(p); |
| 1149 | } |
| 1150 | |
| 1151 | private: |
| 1152 | // Lookup a string in the ELF string table. |
| 1153 | const char* get_string(unsigned int offset) const |
| 1154 | { |
| 1155 | const char* s; |
| 1156 | if (this->strtab_.get_c_string(offset, &s)) |
| 1157 | return s; |
| 1158 | return NULL; |
| 1159 | } |
| 1160 | |
| 1161 | // Base address of the .gnu_incremental_inputs section. |
| 1162 | const unsigned char* p_; |
| 1163 | // The associated ELF string table. |
| 1164 | elfcpp::Elf_strtab strtab_; |
| 1165 | // The number of input file entries in this section. |
| 1166 | unsigned int input_file_count_; |
| 1167 | }; |
| 1168 | |
| 1169 | // Reader class for the .gnu_incremental_symtab section. |
| 1170 | |
| 1171 | template<bool big_endian> |
| 1172 | class Incremental_symtab_reader |
| 1173 | { |
| 1174 | public: |
| 1175 | Incremental_symtab_reader() |
| 1176 | : p_(NULL), len_(0) |
| 1177 | { } |
| 1178 | |
| 1179 | Incremental_symtab_reader(const unsigned char* p, off_t len) |
| 1180 | : p_(p), len_(len) |
| 1181 | { } |
| 1182 | |
| 1183 | // Return the count of symbols in this section. |
| 1184 | unsigned int |
| 1185 | symbol_count() const |
| 1186 | { return static_cast<unsigned int>(this->len_ / 4); } |
| 1187 | |
| 1188 | // Return the list head for symbol table entry N. |
| 1189 | unsigned int |
| 1190 | get_list_head(unsigned int n) const |
| 1191 | { return elfcpp::Swap<32, big_endian>::readval(this->p_ + 4 * n); } |
| 1192 | |
| 1193 | private: |
| 1194 | // Base address of the .gnu_incremental_relocs section. |
| 1195 | const unsigned char* p_; |
| 1196 | // Size of the section. |
| 1197 | off_t len_; |
| 1198 | }; |
| 1199 | |
| 1200 | // Reader class for the .gnu_incremental_relocs section. |
| 1201 | |
| 1202 | template<int size, bool big_endian> |
| 1203 | class Incremental_relocs_reader |
| 1204 | { |
| 1205 | private: |
| 1206 | // Size of each field. |
| 1207 | static const unsigned int field_size = size / 8; |
| 1208 | |
| 1209 | public: |
| 1210 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 1211 | typedef typename elfcpp::Elf_types<size>::Elf_Swxword Addend; |
| 1212 | |
| 1213 | // Size of each entry. |
| 1214 | static const unsigned int reloc_size = 8 + 2 * field_size; |
| 1215 | |
| 1216 | Incremental_relocs_reader() |
| 1217 | : p_(NULL), len_(0) |
| 1218 | { } |
| 1219 | |
| 1220 | Incremental_relocs_reader(const unsigned char* p, off_t len) |
| 1221 | : p_(p), len_(len) |
| 1222 | { } |
| 1223 | |
| 1224 | // Return the count of relocations in this section. |
| 1225 | unsigned int |
| 1226 | reloc_count() const |
| 1227 | { return static_cast<unsigned int>(this->len_ / reloc_size); } |
| 1228 | |
| 1229 | // Return the relocation type for relocation entry at offset OFF. |
| 1230 | unsigned int |
| 1231 | get_r_type(unsigned int off) const |
| 1232 | { return elfcpp::Swap<32, big_endian>::readval(this->p_ + off); } |
| 1233 | |
| 1234 | // Return the output section index for relocation entry at offset OFF. |
| 1235 | unsigned int |
| 1236 | get_r_shndx(unsigned int off) const |
| 1237 | { return elfcpp::Swap<32, big_endian>::readval(this->p_ + off + 4); } |
| 1238 | |
| 1239 | // Return the output section offset for relocation entry at offset OFF. |
| 1240 | Address |
| 1241 | get_r_offset(unsigned int off) const |
| 1242 | { return elfcpp::Swap<size, big_endian>::readval(this->p_ + off + 8); } |
| 1243 | |
| 1244 | // Return the addend for relocation entry at offset OFF. |
| 1245 | Addend |
| 1246 | get_r_addend(unsigned int off) const |
| 1247 | { |
| 1248 | return elfcpp::Swap<size, big_endian>::readval(this->p_ + off + 8 |
| 1249 | + this->field_size); |
| 1250 | } |
| 1251 | |
| 1252 | // Return a pointer to the relocation entry at offset OFF. |
| 1253 | const unsigned char* |
| 1254 | data(unsigned int off) const |
| 1255 | { return this->p_ + off; } |
| 1256 | |
| 1257 | private: |
| 1258 | // Base address of the .gnu_incremental_relocs section. |
| 1259 | const unsigned char* p_; |
| 1260 | // Size of the section. |
| 1261 | off_t len_; |
| 1262 | }; |
| 1263 | |
| 1264 | // Reader class for the .gnu_incremental_got_plt section. |
| 1265 | |
| 1266 | template<bool big_endian> |
| 1267 | class Incremental_got_plt_reader |
| 1268 | { |
| 1269 | public: |
| 1270 | Incremental_got_plt_reader() |
| 1271 | : p_(NULL), got_count_(0), got_desc_p_(NULL), plt_desc_p_(NULL) |
| 1272 | { } |
| 1273 | |
| 1274 | Incremental_got_plt_reader(const unsigned char* p) : p_(p) |
| 1275 | { |
| 1276 | this->got_count_ = elfcpp::Swap<32, big_endian>::readval(p); |
| 1277 | this->got_desc_p_ = p + 8 + ((this->got_count_ + 3) & ~3); |
| 1278 | this->plt_desc_p_ = this->got_desc_p_ + this->got_count_ * 8; |
| 1279 | } |
| 1280 | |
| 1281 | // Return the GOT entry count. |
| 1282 | unsigned int |
| 1283 | get_got_entry_count() const |
| 1284 | { |
| 1285 | return this->got_count_; |
| 1286 | } |
| 1287 | |
| 1288 | // Return the PLT entry count. |
| 1289 | unsigned int |
| 1290 | get_plt_entry_count() const |
| 1291 | { |
| 1292 | return elfcpp::Swap<32, big_endian>::readval(this->p_ + 4); |
| 1293 | } |
| 1294 | |
| 1295 | // Return the GOT type for GOT entry N. |
| 1296 | unsigned int |
| 1297 | get_got_type(unsigned int n) |
| 1298 | { |
| 1299 | return this->p_[8 + n]; |
| 1300 | } |
| 1301 | |
| 1302 | // Return the symbol index for GOT entry N. |
| 1303 | unsigned int |
| 1304 | get_got_symndx(unsigned int n) |
| 1305 | { |
| 1306 | return elfcpp::Swap<32, big_endian>::readval(this->got_desc_p_ + n * 8); |
| 1307 | } |
| 1308 | |
| 1309 | // Return the input file index for GOT entry N. |
| 1310 | unsigned int |
| 1311 | get_got_input_index(unsigned int n) |
| 1312 | { |
| 1313 | return elfcpp::Swap<32, big_endian>::readval(this->got_desc_p_ + n * 8 + 4); |
| 1314 | } |
| 1315 | |
| 1316 | // Return the PLT descriptor for PLT entry N. |
| 1317 | unsigned int |
| 1318 | get_plt_desc(unsigned int n) |
| 1319 | { |
| 1320 | return elfcpp::Swap<32, big_endian>::readval(this->plt_desc_p_ + n * 4); |
| 1321 | } |
| 1322 | |
| 1323 | private: |
| 1324 | // Base address of the .gnu_incremental_got_plt section. |
| 1325 | const unsigned char* p_; |
| 1326 | // GOT entry count. |
| 1327 | unsigned int got_count_; |
| 1328 | // Base address of the GOT descriptor array. |
| 1329 | const unsigned char* got_desc_p_; |
| 1330 | // Base address of the PLT descriptor array. |
| 1331 | const unsigned char* plt_desc_p_; |
| 1332 | }; |
| 1333 | |
| 1334 | // An object representing the ELF file we edit during an incremental build. |
| 1335 | // Similar to Object or Dynobj, but operates on Output_file and contains |
| 1336 | // methods to support incremental updating. This is the abstract parent class |
| 1337 | // implemented in Sized_incremental_binary<size, big_endian> for a specific |
| 1338 | // endianness and size. |
| 1339 | |
| 1340 | class Incremental_binary |
| 1341 | { |
| 1342 | public: |
| 1343 | Incremental_binary(Output_file* output, Target* /*target*/) |
| 1344 | : input_args_map_(), library_map_(), script_map_(), |
| 1345 | output_(output) |
| 1346 | { } |
| 1347 | |
| 1348 | virtual |
| 1349 | ~Incremental_binary() |
| 1350 | { } |
| 1351 | |
| 1352 | // Check the .gnu_incremental_inputs section to see whether an incremental |
| 1353 | // build is possible. |
| 1354 | bool |
| 1355 | check_inputs(const Command_line& cmdline, |
| 1356 | Incremental_inputs* incremental_inputs) |
| 1357 | { return this->do_check_inputs(cmdline, incremental_inputs); } |
| 1358 | |
| 1359 | // Report an error. |
| 1360 | void |
| 1361 | error(const char* format, ...) const ATTRIBUTE_PRINTF_2; |
| 1362 | |
| 1363 | // Proxy class for a sized Incremental_input_entry_reader. |
| 1364 | |
| 1365 | class Input_reader |
| 1366 | { |
| 1367 | public: |
| 1368 | Input_reader() |
| 1369 | { } |
| 1370 | |
| 1371 | virtual |
| 1372 | ~Input_reader() |
| 1373 | { } |
| 1374 | |
| 1375 | const char* |
| 1376 | filename() const |
| 1377 | { return this->do_filename(); } |
| 1378 | |
| 1379 | Timespec |
| 1380 | get_mtime() const |
| 1381 | { return this->do_get_mtime(); } |
| 1382 | |
| 1383 | Incremental_input_type |
| 1384 | type() const |
| 1385 | { return this->do_type(); } |
| 1386 | |
| 1387 | unsigned int |
| 1388 | arg_serial() const |
| 1389 | { return this->do_arg_serial(); } |
| 1390 | |
| 1391 | unsigned int |
| 1392 | get_unused_symbol_count() const |
| 1393 | { return this->do_get_unused_symbol_count(); } |
| 1394 | |
| 1395 | const char* |
| 1396 | get_unused_symbol(unsigned int n) const |
| 1397 | { return this->do_get_unused_symbol(n); } |
| 1398 | |
| 1399 | protected: |
| 1400 | virtual const char* |
| 1401 | do_filename() const = 0; |
| 1402 | |
| 1403 | virtual Timespec |
| 1404 | do_get_mtime() const = 0; |
| 1405 | |
| 1406 | virtual Incremental_input_type |
| 1407 | do_type() const = 0; |
| 1408 | |
| 1409 | virtual unsigned int |
| 1410 | do_arg_serial() const = 0; |
| 1411 | |
| 1412 | virtual unsigned int |
| 1413 | do_get_unused_symbol_count() const = 0; |
| 1414 | |
| 1415 | virtual const char* |
| 1416 | do_get_unused_symbol(unsigned int n) const = 0; |
| 1417 | }; |
| 1418 | |
| 1419 | // Return the number of input files. |
| 1420 | unsigned int |
| 1421 | input_file_count() const |
| 1422 | { return this->do_input_file_count(); } |
| 1423 | |
| 1424 | // Return an Input_reader for input file N. |
| 1425 | const Input_reader* |
| 1426 | get_input_reader(unsigned int n) const |
| 1427 | { return this->do_get_input_reader(n); } |
| 1428 | |
| 1429 | // Return TRUE if the input file N has changed since the last link. |
| 1430 | bool |
| 1431 | file_has_changed(unsigned int n) const |
| 1432 | { return this->do_file_has_changed(n); } |
| 1433 | |
| 1434 | // Return the Input_argument for input file N. Returns NULL if |
| 1435 | // the Input_argument is not available. |
| 1436 | const Input_argument* |
| 1437 | get_input_argument(unsigned int n) const |
| 1438 | { |
| 1439 | const Input_reader* input_file = this->do_get_input_reader(n); |
| 1440 | unsigned int arg_serial = input_file->arg_serial(); |
| 1441 | if (arg_serial == 0 || arg_serial > this->input_args_map_.size()) |
| 1442 | return NULL; |
| 1443 | return this->input_args_map_[arg_serial - 1]; |
| 1444 | } |
| 1445 | |
| 1446 | // Return an Incremental_library for the given input file. |
| 1447 | Incremental_library* |
| 1448 | get_library(unsigned int n) const |
| 1449 | { return this->library_map_[n]; } |
| 1450 | |
| 1451 | // Return a Script_info for the given input file. |
| 1452 | Script_info* |
| 1453 | get_script_info(unsigned int n) const |
| 1454 | { return this->script_map_[n]; } |
| 1455 | |
| 1456 | // Initialize the layout of the output file based on the existing |
| 1457 | // output file. |
| 1458 | void |
| 1459 | init_layout(Layout* layout) |
| 1460 | { this->do_init_layout(layout); } |
| 1461 | |
| 1462 | // Mark regions of the input file that must be kept unchanged. |
| 1463 | void |
| 1464 | reserve_layout(unsigned int input_file_index) |
| 1465 | { this->do_reserve_layout(input_file_index); } |
| 1466 | |
| 1467 | // Process the GOT and PLT entries from the existing output file. |
| 1468 | void |
| 1469 | process_got_plt(Symbol_table* symtab, Layout* layout) |
| 1470 | { this->do_process_got_plt(symtab, layout); } |
| 1471 | |
| 1472 | // Emit COPY relocations from the existing output file. |
| 1473 | void |
| 1474 | emit_copy_relocs(Symbol_table* symtab) |
| 1475 | { this->do_emit_copy_relocs(symtab); } |
| 1476 | |
| 1477 | // Apply incremental relocations for symbols whose values have changed. |
| 1478 | void |
| 1479 | apply_incremental_relocs(const Symbol_table* symtab, Layout* layout, |
| 1480 | Output_file* of) |
| 1481 | { this->do_apply_incremental_relocs(symtab, layout, of); } |
| 1482 | |
| 1483 | // Functions and types for the elfcpp::Elf_file interface. This |
| 1484 | // permit us to use Incremental_binary as the File template parameter for |
| 1485 | // elfcpp::Elf_file. |
| 1486 | |
| 1487 | // The View class is returned by view. It must support a single |
| 1488 | // method, data(). This is trivial, because Output_file::get_output_view |
| 1489 | // does what we need. |
| 1490 | class View |
| 1491 | { |
| 1492 | public: |
| 1493 | View(const unsigned char* p) |
| 1494 | : p_(p) |
| 1495 | { } |
| 1496 | |
| 1497 | const unsigned char* |
| 1498 | data() const |
| 1499 | { return this->p_; } |
| 1500 | |
| 1501 | private: |
| 1502 | const unsigned char* p_; |
| 1503 | }; |
| 1504 | |
| 1505 | // Return a View. |
| 1506 | View |
| 1507 | view(off_t file_offset, section_size_type data_size) |
| 1508 | { return View(this->output_->get_input_view(file_offset, data_size)); } |
| 1509 | |
| 1510 | // A location in the file. |
| 1511 | struct Location |
| 1512 | { |
| 1513 | off_t file_offset; |
| 1514 | off_t data_size; |
| 1515 | |
| 1516 | Location(off_t fo, section_size_type ds) |
| 1517 | : file_offset(fo), data_size(ds) |
| 1518 | { } |
| 1519 | |
| 1520 | Location() |
| 1521 | : file_offset(0), data_size(0) |
| 1522 | { } |
| 1523 | }; |
| 1524 | |
| 1525 | // Get a View given a Location. |
| 1526 | View |
| 1527 | view(Location loc) |
| 1528 | { return View(this->view(loc.file_offset, loc.data_size)); } |
| 1529 | |
| 1530 | // Return the Output_file. |
| 1531 | Output_file* |
| 1532 | output_file() |
| 1533 | { return this->output_; } |
| 1534 | |
| 1535 | protected: |
| 1536 | // Check the .gnu_incremental_inputs section to see whether an incremental |
| 1537 | // build is possible. |
| 1538 | virtual bool |
| 1539 | do_check_inputs(const Command_line& cmdline, |
| 1540 | Incremental_inputs* incremental_inputs) = 0; |
| 1541 | |
| 1542 | // Return TRUE if input file N has changed since the last incremental link. |
| 1543 | virtual bool |
| 1544 | do_file_has_changed(unsigned int n) const = 0; |
| 1545 | |
| 1546 | // Initialize the layout of the output file based on the existing |
| 1547 | // output file. |
| 1548 | virtual void |
| 1549 | do_init_layout(Layout* layout) = 0; |
| 1550 | |
| 1551 | // Mark regions of the input file that must be kept unchanged. |
| 1552 | virtual void |
| 1553 | do_reserve_layout(unsigned int input_file_index) = 0; |
| 1554 | |
| 1555 | // Process the GOT and PLT entries from the existing output file. |
| 1556 | virtual void |
| 1557 | do_process_got_plt(Symbol_table* symtab, Layout* layout) = 0; |
| 1558 | |
| 1559 | // Emit COPY relocations from the existing output file. |
| 1560 | virtual void |
| 1561 | do_emit_copy_relocs(Symbol_table* symtab) = 0; |
| 1562 | |
| 1563 | // Apply incremental relocations for symbols whose values have changed. |
| 1564 | virtual void |
| 1565 | do_apply_incremental_relocs(const Symbol_table*, Layout*, Output_file*) = 0; |
| 1566 | |
| 1567 | virtual unsigned int |
| 1568 | do_input_file_count() const = 0; |
| 1569 | |
| 1570 | virtual const Input_reader* |
| 1571 | do_get_input_reader(unsigned int) const = 0; |
| 1572 | |
| 1573 | // Map from input file index to Input_argument. |
| 1574 | std::vector<const Input_argument*> input_args_map_; |
| 1575 | // Map from an input file index to an Incremental_library. |
| 1576 | std::vector<Incremental_library*> library_map_; |
| 1577 | // Map from an input file index to a Script_info. |
| 1578 | std::vector<Script_info*> script_map_; |
| 1579 | |
| 1580 | private: |
| 1581 | // Edited output file object. |
| 1582 | Output_file* output_; |
| 1583 | }; |
| 1584 | |
| 1585 | template<int size, bool big_endian> |
| 1586 | class Sized_relobj_incr; |
| 1587 | |
| 1588 | template<int size, bool big_endian> |
| 1589 | class Sized_incremental_binary : public Incremental_binary |
| 1590 | { |
| 1591 | public: |
| 1592 | Sized_incremental_binary(Output_file* output, |
| 1593 | const elfcpp::Ehdr<size, big_endian>& ehdr, |
| 1594 | Target* target) |
| 1595 | : Incremental_binary(output, target), elf_file_(this, ehdr), |
| 1596 | input_objects_(), section_map_(), symbol_map_(), copy_relocs_(), |
| 1597 | main_symtab_loc_(), main_strtab_loc_(), has_incremental_info_(false), |
| 1598 | inputs_reader_(), symtab_reader_(), relocs_reader_(), got_plt_reader_(), |
| 1599 | input_entry_readers_() |
| 1600 | { this->setup_readers(); } |
| 1601 | |
| 1602 | // Returns TRUE if the file contains incremental info. |
| 1603 | bool |
| 1604 | has_incremental_info() const |
| 1605 | { return this->has_incremental_info_; } |
| 1606 | |
| 1607 | // Record a pointer to the object for input file N. |
| 1608 | void |
| 1609 | set_input_object(unsigned int n, |
| 1610 | Sized_relobj_incr<size, big_endian>* obj) |
| 1611 | { this->input_objects_[n] = obj; } |
| 1612 | |
| 1613 | // Return a pointer to the object for input file N. |
| 1614 | Sized_relobj_incr<size, big_endian>* |
| 1615 | input_object(unsigned int n) const |
| 1616 | { |
| 1617 | gold_assert(n < this->input_objects_.size()); |
| 1618 | return this->input_objects_[n]; |
| 1619 | } |
| 1620 | |
| 1621 | // Return the Output_section for section index SHNDX. |
| 1622 | Output_section* |
| 1623 | output_section(unsigned int shndx) |
| 1624 | { return this->section_map_[shndx]; } |
| 1625 | |
| 1626 | // Map a symbol table entry from the base file to the output symbol table. |
| 1627 | // SYMNDX is relative to the first forced-local or global symbol in the |
| 1628 | // input file symbol table. |
| 1629 | void |
| 1630 | add_global_symbol(unsigned int symndx, Symbol* gsym) |
| 1631 | { this->symbol_map_[symndx] = gsym; } |
| 1632 | |
| 1633 | // Map a symbol table entry from the base file to the output symbol table. |
| 1634 | // SYMNDX is relative to the first forced-local or global symbol in the |
| 1635 | // input file symbol table. |
| 1636 | Symbol* |
| 1637 | global_symbol(unsigned int symndx) const |
| 1638 | { return this->symbol_map_[symndx]; } |
| 1639 | |
| 1640 | // Add a COPY relocation for a global symbol. |
| 1641 | void |
| 1642 | add_copy_reloc(Symbol* gsym, Output_section* os, off_t offset) |
| 1643 | { this->copy_relocs_.push_back(Copy_reloc(gsym, os, offset)); } |
| 1644 | |
| 1645 | // Readers for the incremental info sections. |
| 1646 | |
| 1647 | const Incremental_inputs_reader<size, big_endian>& |
| 1648 | inputs_reader() const |
| 1649 | { return this->inputs_reader_; } |
| 1650 | |
| 1651 | const Incremental_symtab_reader<big_endian>& |
| 1652 | symtab_reader() const |
| 1653 | { return this->symtab_reader_; } |
| 1654 | |
| 1655 | const Incremental_relocs_reader<size, big_endian>& |
| 1656 | relocs_reader() const |
| 1657 | { return this->relocs_reader_; } |
| 1658 | |
| 1659 | const Incremental_got_plt_reader<big_endian>& |
| 1660 | got_plt_reader() const |
| 1661 | { return this->got_plt_reader_; } |
| 1662 | |
| 1663 | void |
| 1664 | get_symtab_view(View* symtab_view, unsigned int* sym_count, |
| 1665 | elfcpp::Elf_strtab* strtab); |
| 1666 | |
| 1667 | protected: |
| 1668 | typedef Incremental_inputs_reader<size, big_endian> Inputs_reader; |
| 1669 | typedef typename Inputs_reader::Incremental_input_entry_reader |
| 1670 | Input_entry_reader; |
| 1671 | |
| 1672 | virtual bool |
| 1673 | do_check_inputs(const Command_line& cmdline, |
| 1674 | Incremental_inputs* incremental_inputs); |
| 1675 | |
| 1676 | // Return TRUE if input file N has changed since the last incremental link. |
| 1677 | virtual bool |
| 1678 | do_file_has_changed(unsigned int n) const; |
| 1679 | |
| 1680 | // Initialize the layout of the output file based on the existing |
| 1681 | // output file. |
| 1682 | virtual void |
| 1683 | do_init_layout(Layout* layout); |
| 1684 | |
| 1685 | // Mark regions of the input file that must be kept unchanged. |
| 1686 | virtual void |
| 1687 | do_reserve_layout(unsigned int input_file_index); |
| 1688 | |
| 1689 | // Process the GOT and PLT entries from the existing output file. |
| 1690 | virtual void |
| 1691 | do_process_got_plt(Symbol_table* symtab, Layout* layout); |
| 1692 | |
| 1693 | // Emit COPY relocations from the existing output file. |
| 1694 | virtual void |
| 1695 | do_emit_copy_relocs(Symbol_table* symtab); |
| 1696 | |
| 1697 | // Apply incremental relocations for symbols whose values have changed. |
| 1698 | virtual void |
| 1699 | do_apply_incremental_relocs(const Symbol_table* symtab, Layout* layout, |
| 1700 | Output_file* of); |
| 1701 | |
| 1702 | // Proxy class for a sized Incremental_input_entry_reader. |
| 1703 | |
| 1704 | class Sized_input_reader : public Input_reader |
| 1705 | { |
| 1706 | public: |
| 1707 | Sized_input_reader(Input_entry_reader r) |
| 1708 | : Input_reader(), reader_(r) |
| 1709 | { } |
| 1710 | |
| 1711 | virtual |
| 1712 | ~Sized_input_reader() |
| 1713 | { } |
| 1714 | |
| 1715 | private: |
| 1716 | const char* |
| 1717 | do_filename() const |
| 1718 | { return this->reader_.filename(); } |
| 1719 | |
| 1720 | Timespec |
| 1721 | do_get_mtime() const |
| 1722 | { return this->reader_.get_mtime(); } |
| 1723 | |
| 1724 | Incremental_input_type |
| 1725 | do_type() const |
| 1726 | { return this->reader_.type(); } |
| 1727 | |
| 1728 | unsigned int |
| 1729 | do_arg_serial() const |
| 1730 | { return this->reader_.arg_serial(); } |
| 1731 | |
| 1732 | unsigned int |
| 1733 | do_get_unused_symbol_count() const |
| 1734 | { return this->reader_.get_unused_symbol_count(); } |
| 1735 | |
| 1736 | const char* |
| 1737 | do_get_unused_symbol(unsigned int n) const |
| 1738 | { return this->reader_.get_unused_symbol(n); } |
| 1739 | |
| 1740 | Input_entry_reader reader_; |
| 1741 | }; |
| 1742 | |
| 1743 | virtual unsigned int |
| 1744 | do_input_file_count() const |
| 1745 | { return this->inputs_reader_.input_file_count(); } |
| 1746 | |
| 1747 | virtual const Input_reader* |
| 1748 | do_get_input_reader(unsigned int n) const |
| 1749 | { |
| 1750 | gold_assert(n < this->input_entry_readers_.size()); |
| 1751 | return &this->input_entry_readers_[n]; |
| 1752 | } |
| 1753 | |
| 1754 | private: |
| 1755 | // List of symbols that need COPY relocations. |
| 1756 | struct Copy_reloc |
| 1757 | { |
| 1758 | Copy_reloc(Symbol* sym, Output_section* os, off_t off) |
| 1759 | : symbol(sym), output_section(os), offset(off) |
| 1760 | { } |
| 1761 | |
| 1762 | // The global symbol to copy. |
| 1763 | Symbol* symbol; |
| 1764 | // The output section into which the symbol was copied. |
| 1765 | Output_section* output_section; |
| 1766 | // The offset within that output section. |
| 1767 | off_t offset; |
| 1768 | }; |
| 1769 | typedef std::vector<Copy_reloc> Copy_relocs; |
| 1770 | |
| 1771 | bool |
| 1772 | find_incremental_inputs_sections(unsigned int* p_inputs_shndx, |
| 1773 | unsigned int* p_symtab_shndx, |
| 1774 | unsigned int* p_relocs_shndx, |
| 1775 | unsigned int* p_got_plt_shndx, |
| 1776 | unsigned int* p_strtab_shndx); |
| 1777 | |
| 1778 | void |
| 1779 | setup_readers(); |
| 1780 | |
| 1781 | // Output as an ELF file. |
| 1782 | elfcpp::Elf_file<size, big_endian, Incremental_binary> elf_file_; |
| 1783 | |
| 1784 | // Vector of pointers to the input objects for the unchanged files. |
| 1785 | // For replaced files, the corresponding pointer is NULL. |
| 1786 | std::vector<Sized_relobj_incr<size, big_endian>*> input_objects_; |
| 1787 | |
| 1788 | // Map section index to an Output_section in the updated layout. |
| 1789 | std::vector<Output_section*> section_map_; |
| 1790 | |
| 1791 | // Map global symbols from the input file to the symbol table. |
| 1792 | std::vector<Symbol*> symbol_map_; |
| 1793 | |
| 1794 | // List of symbols that need COPY relocations. |
| 1795 | Copy_relocs copy_relocs_; |
| 1796 | |
| 1797 | // Locations of the main symbol table and symbol string table. |
| 1798 | Location main_symtab_loc_; |
| 1799 | Location main_strtab_loc_; |
| 1800 | |
| 1801 | // Readers for the incremental info sections. |
| 1802 | bool has_incremental_info_; |
| 1803 | Incremental_inputs_reader<size, big_endian> inputs_reader_; |
| 1804 | Incremental_symtab_reader<big_endian> symtab_reader_; |
| 1805 | Incremental_relocs_reader<size, big_endian> relocs_reader_; |
| 1806 | Incremental_got_plt_reader<big_endian> got_plt_reader_; |
| 1807 | std::vector<Sized_input_reader> input_entry_readers_; |
| 1808 | }; |
| 1809 | |
| 1810 | // An incremental Relobj. This class represents a relocatable object |
| 1811 | // that has not changed since the last incremental link, and whose contents |
| 1812 | // can be used directly from the base file. |
| 1813 | |
| 1814 | template<int size, bool big_endian> |
| 1815 | class Sized_relobj_incr : public Sized_relobj<size, big_endian> |
| 1816 | { |
| 1817 | public: |
| 1818 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 1819 | typedef typename Sized_relobj<size, big_endian>::Symbols Symbols; |
| 1820 | |
| 1821 | Sized_relobj_incr(const std::string& name, |
| 1822 | Sized_incremental_binary<size, big_endian>* ibase, |
| 1823 | unsigned int input_file_index); |
| 1824 | |
| 1825 | private: |
| 1826 | // For convenience. |
| 1827 | typedef Sized_relobj_incr<size, big_endian> This; |
| 1828 | static const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
| 1829 | |
| 1830 | typedef typename Sized_relobj<size, big_endian>::Output_sections |
| 1831 | Output_sections; |
| 1832 | typedef Incremental_inputs_reader<size, big_endian> Inputs_reader; |
| 1833 | typedef typename Inputs_reader::Incremental_input_entry_reader |
| 1834 | Input_entry_reader; |
| 1835 | |
| 1836 | // A local symbol. |
| 1837 | struct Local_symbol |
| 1838 | { |
| 1839 | Local_symbol(const char* name_, Address value_, unsigned int size_, |
| 1840 | unsigned int shndx_, unsigned int type_, |
| 1841 | bool needs_dynsym_entry_) |
| 1842 | : st_value(value_), name(name_), st_size(size_), st_shndx(shndx_), |
| 1843 | st_type(type_), output_dynsym_index(0), |
| 1844 | needs_dynsym_entry(needs_dynsym_entry_) |
| 1845 | { } |
| 1846 | // The symbol value. |
| 1847 | Address st_value; |
| 1848 | // The symbol name. This points to the stringpool entry. |
| 1849 | const char* name; |
| 1850 | // The symbol size. |
| 1851 | unsigned int st_size; |
| 1852 | // The output section index. |
| 1853 | unsigned int st_shndx : 28; |
| 1854 | // The symbol type. |
| 1855 | unsigned int st_type : 4; |
| 1856 | // The index of the symbol in the output dynamic symbol table. |
| 1857 | unsigned int output_dynsym_index : 31; |
| 1858 | // TRUE if the symbol needs to appear in the dynamic symbol table. |
| 1859 | unsigned int needs_dynsym_entry : 1; |
| 1860 | }; |
| 1861 | |
| 1862 | // Return TRUE if this is an incremental (unchanged) input file. |
| 1863 | bool |
| 1864 | do_is_incremental() const |
| 1865 | { return true; } |
| 1866 | |
| 1867 | // Return the last modified time of the file. |
| 1868 | Timespec |
| 1869 | do_get_mtime() |
| 1870 | { return this->input_reader_.get_mtime(); } |
| 1871 | |
| 1872 | // Read the symbols. |
| 1873 | void |
| 1874 | do_read_symbols(Read_symbols_data*); |
| 1875 | |
| 1876 | // Lay out the input sections. |
| 1877 | void |
| 1878 | do_layout(Symbol_table*, Layout*, Read_symbols_data*); |
| 1879 | |
| 1880 | // Layout sections whose layout was deferred while waiting for |
| 1881 | // input files from a plugin. |
| 1882 | void |
| 1883 | do_layout_deferred_sections(Layout*); |
| 1884 | |
| 1885 | // Add the symbols to the symbol table. |
| 1886 | void |
| 1887 | do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*); |
| 1888 | |
| 1889 | Archive::Should_include |
| 1890 | do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*, |
| 1891 | std::string* why); |
| 1892 | |
| 1893 | // Iterate over global symbols, calling a visitor class V for each. |
| 1894 | void |
| 1895 | do_for_all_global_symbols(Read_symbols_data* sd, |
| 1896 | Library_base::Symbol_visitor_base* v); |
| 1897 | |
| 1898 | // Get the size of a section. |
| 1899 | uint64_t |
| 1900 | do_section_size(unsigned int shndx); |
| 1901 | |
| 1902 | // Get the name of a section. |
| 1903 | std::string |
| 1904 | do_section_name(unsigned int shndx) const; |
| 1905 | |
| 1906 | // Return a view of the contents of a section. |
| 1907 | const unsigned char* |
| 1908 | do_section_contents(unsigned int shndx, section_size_type* plen, |
| 1909 | bool cache); |
| 1910 | |
| 1911 | // Return section flags. |
| 1912 | uint64_t |
| 1913 | do_section_flags(unsigned int shndx); |
| 1914 | |
| 1915 | // Return section entsize. |
| 1916 | uint64_t |
| 1917 | do_section_entsize(unsigned int shndx); |
| 1918 | |
| 1919 | // Return section address. |
| 1920 | uint64_t |
| 1921 | do_section_address(unsigned int shndx); |
| 1922 | |
| 1923 | // Return section type. |
| 1924 | unsigned int |
| 1925 | do_section_type(unsigned int shndx); |
| 1926 | |
| 1927 | // Return the section link field. |
| 1928 | unsigned int |
| 1929 | do_section_link(unsigned int shndx); |
| 1930 | |
| 1931 | // Return the section link field. |
| 1932 | unsigned int |
| 1933 | do_section_info(unsigned int shndx); |
| 1934 | |
| 1935 | // Return the section alignment. |
| 1936 | uint64_t |
| 1937 | do_section_addralign(unsigned int shndx); |
| 1938 | |
| 1939 | // Return the Xindex structure to use. |
| 1940 | Xindex* |
| 1941 | do_initialize_xindex(); |
| 1942 | |
| 1943 | // Get symbol counts. |
| 1944 | void |
| 1945 | do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const; |
| 1946 | |
| 1947 | // Get global symbols. |
| 1948 | const Symbols* |
| 1949 | do_get_global_symbols() const |
| 1950 | { return &this->symbols_; } |
| 1951 | |
| 1952 | // Return the value of a local symbol. |
| 1953 | uint64_t |
| 1954 | do_local_symbol_value(unsigned int, uint64_t) const |
| 1955 | { gold_unreachable(); } |
| 1956 | |
| 1957 | unsigned int |
| 1958 | do_local_plt_offset(unsigned int) const |
| 1959 | { gold_unreachable(); } |
| 1960 | |
| 1961 | bool |
| 1962 | do_local_is_tls(unsigned int) const |
| 1963 | { gold_unreachable(); } |
| 1964 | |
| 1965 | // Return the number of local symbols. |
| 1966 | unsigned int |
| 1967 | do_local_symbol_count() const |
| 1968 | { return this->local_symbol_count_; } |
| 1969 | |
| 1970 | // Return the number of local symbols in the output symbol table. |
| 1971 | unsigned int |
| 1972 | do_output_local_symbol_count() const |
| 1973 | { return this->local_symbol_count_; } |
| 1974 | |
| 1975 | // Return the file offset for local symbols in the output symbol table. |
| 1976 | off_t |
| 1977 | do_local_symbol_offset() const |
| 1978 | { return this->local_symbol_offset_; } |
| 1979 | |
| 1980 | // Read the relocs. |
| 1981 | void |
| 1982 | do_read_relocs(Read_relocs_data*); |
| 1983 | |
| 1984 | // Process the relocs to find list of referenced sections. Used only |
| 1985 | // during garbage collection. |
| 1986 | void |
| 1987 | do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*); |
| 1988 | |
| 1989 | // Scan the relocs and adjust the symbol table. |
| 1990 | void |
| 1991 | do_scan_relocs(Symbol_table*, Layout*, Read_relocs_data*); |
| 1992 | |
| 1993 | // Count the local symbols. |
| 1994 | void |
| 1995 | do_count_local_symbols(Stringpool_template<char>*, |
| 1996 | Stringpool_template<char>*); |
| 1997 | |
| 1998 | // Finalize the local symbols. |
| 1999 | unsigned int |
| 2000 | do_finalize_local_symbols(unsigned int, off_t, Symbol_table*); |
| 2001 | |
| 2002 | // Set the offset where local dynamic symbol information will be stored. |
| 2003 | unsigned int |
| 2004 | do_set_local_dynsym_indexes(unsigned int); |
| 2005 | |
| 2006 | // Set the offset where local dynamic symbol information will be stored. |
| 2007 | unsigned int |
| 2008 | do_set_local_dynsym_offset(off_t); |
| 2009 | |
| 2010 | // Relocate the input sections and write out the local symbols. |
| 2011 | void |
| 2012 | do_relocate(const Symbol_table* symtab, const Layout*, Output_file* of); |
| 2013 | |
| 2014 | // Set the offset of a section. |
| 2015 | void |
| 2016 | do_set_section_offset(unsigned int shndx, uint64_t off); |
| 2017 | |
| 2018 | // The Incremental_binary base file. |
| 2019 | Sized_incremental_binary<size, big_endian>* ibase_; |
| 2020 | // The index of the object in the input file list. |
| 2021 | unsigned int input_file_index_; |
| 2022 | // The reader for the input file. |
| 2023 | Input_entry_reader input_reader_; |
| 2024 | // The number of local symbols. |
| 2025 | unsigned int local_symbol_count_; |
| 2026 | // The number of local symbols which go into the output file's dynamic |
| 2027 | // symbol table. |
| 2028 | unsigned int output_local_dynsym_count_; |
| 2029 | // This starting symbol index in the output symbol table. |
| 2030 | unsigned int local_symbol_index_; |
| 2031 | // The file offset for local symbols in the output symbol table. |
| 2032 | unsigned int local_symbol_offset_; |
| 2033 | // The file offset for local symbols in the output symbol table. |
| 2034 | unsigned int local_dynsym_offset_; |
| 2035 | // The entries in the symbol table for the external symbols. |
| 2036 | Symbols symbols_; |
| 2037 | // Number of symbols defined in object file itself. |
| 2038 | size_t defined_count_; |
| 2039 | // The offset of the first incremental relocation for this object. |
| 2040 | unsigned int incr_reloc_offset_; |
| 2041 | // The number of incremental relocations for this object. |
| 2042 | unsigned int incr_reloc_count_; |
| 2043 | // The index of the first incremental relocation for this object in the |
| 2044 | // updated output file. |
| 2045 | unsigned int incr_reloc_output_index_; |
| 2046 | // A copy of the incremental relocations from this object. |
| 2047 | unsigned char* incr_relocs_; |
| 2048 | // The local symbols. |
| 2049 | std::vector<Local_symbol> local_symbols_; |
| 2050 | }; |
| 2051 | |
| 2052 | // An incremental Dynobj. This class represents a shared object that has |
| 2053 | // not changed since the last incremental link, and whose contents can be |
| 2054 | // used directly from the base file. |
| 2055 | |
| 2056 | template<int size, bool big_endian> |
| 2057 | class Sized_incr_dynobj : public Dynobj |
| 2058 | { |
| 2059 | public: |
| 2060 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 2061 | |
| 2062 | static const Address invalid_address = static_cast<Address>(0) - 1; |
| 2063 | |
| 2064 | Sized_incr_dynobj(const std::string& name, |
| 2065 | Sized_incremental_binary<size, big_endian>* ibase, |
| 2066 | unsigned int input_file_index); |
| 2067 | |
| 2068 | private: |
| 2069 | typedef Incremental_inputs_reader<size, big_endian> Inputs_reader; |
| 2070 | typedef typename Inputs_reader::Incremental_input_entry_reader |
| 2071 | Input_entry_reader; |
| 2072 | |
| 2073 | // Return TRUE if this is an incremental (unchanged) input file. |
| 2074 | bool |
| 2075 | do_is_incremental() const |
| 2076 | { return true; } |
| 2077 | |
| 2078 | // Return the last modified time of the file. |
| 2079 | Timespec |
| 2080 | do_get_mtime() |
| 2081 | { return this->input_reader_.get_mtime(); } |
| 2082 | |
| 2083 | // Read the symbols. |
| 2084 | void |
| 2085 | do_read_symbols(Read_symbols_data*); |
| 2086 | |
| 2087 | // Lay out the input sections. |
| 2088 | void |
| 2089 | do_layout(Symbol_table*, Layout*, Read_symbols_data*); |
| 2090 | |
| 2091 | // Add the symbols to the symbol table. |
| 2092 | void |
| 2093 | do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*); |
| 2094 | |
| 2095 | Archive::Should_include |
| 2096 | do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*, |
| 2097 | std::string* why); |
| 2098 | |
| 2099 | // Iterate over global symbols, calling a visitor class V for each. |
| 2100 | void |
| 2101 | do_for_all_global_symbols(Read_symbols_data* sd, |
| 2102 | Library_base::Symbol_visitor_base* v); |
| 2103 | |
| 2104 | // Iterate over local symbols, calling a visitor class V for each GOT offset |
| 2105 | // associated with a local symbol. |
| 2106 | void |
| 2107 | do_for_all_local_got_entries(Got_offset_list::Visitor* v) const; |
| 2108 | |
| 2109 | // Get the size of a section. |
| 2110 | uint64_t |
| 2111 | do_section_size(unsigned int shndx); |
| 2112 | |
| 2113 | // Get the name of a section. |
| 2114 | std::string |
| 2115 | do_section_name(unsigned int shndx) const; |
| 2116 | |
| 2117 | // Return a view of the contents of a section. |
| 2118 | const unsigned char* |
| 2119 | do_section_contents(unsigned int shndx, section_size_type* plen, |
| 2120 | bool cache); |
| 2121 | |
| 2122 | // Return section flags. |
| 2123 | uint64_t |
| 2124 | do_section_flags(unsigned int shndx); |
| 2125 | |
| 2126 | // Return section entsize. |
| 2127 | uint64_t |
| 2128 | do_section_entsize(unsigned int shndx); |
| 2129 | |
| 2130 | // Return section address. |
| 2131 | uint64_t |
| 2132 | do_section_address(unsigned int shndx); |
| 2133 | |
| 2134 | // Return section type. |
| 2135 | unsigned int |
| 2136 | do_section_type(unsigned int shndx); |
| 2137 | |
| 2138 | // Return the section link field. |
| 2139 | unsigned int |
| 2140 | do_section_link(unsigned int shndx); |
| 2141 | |
| 2142 | // Return the section link field. |
| 2143 | unsigned int |
| 2144 | do_section_info(unsigned int shndx); |
| 2145 | |
| 2146 | // Return the section alignment. |
| 2147 | uint64_t |
| 2148 | do_section_addralign(unsigned int shndx); |
| 2149 | |
| 2150 | // Return the Xindex structure to use. |
| 2151 | Xindex* |
| 2152 | do_initialize_xindex(); |
| 2153 | |
| 2154 | // Get symbol counts. |
| 2155 | void |
| 2156 | do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const; |
| 2157 | |
| 2158 | // Get global symbols. |
| 2159 | const Symbols* |
| 2160 | do_get_global_symbols() const |
| 2161 | { return &this->symbols_; } |
| 2162 | |
| 2163 | // The Incremental_binary base file. |
| 2164 | Sized_incremental_binary<size, big_endian>* ibase_; |
| 2165 | // The index of the object in the input file list. |
| 2166 | unsigned int input_file_index_; |
| 2167 | // The reader for the input file. |
| 2168 | Input_entry_reader input_reader_; |
| 2169 | // The entries in the symbol table for the external symbols. |
| 2170 | Symbols symbols_; |
| 2171 | // Number of symbols defined in object file itself. |
| 2172 | size_t defined_count_; |
| 2173 | }; |
| 2174 | |
| 2175 | // Allocate an incremental object of the appropriate size and endianness. |
| 2176 | extern Object* |
| 2177 | make_sized_incremental_object( |
| 2178 | Incremental_binary* base, |
| 2179 | unsigned int input_file_index, |
| 2180 | Incremental_input_type input_type, |
| 2181 | const Incremental_binary::Input_reader* input_reader); |
| 2182 | |
| 2183 | // This class represents an Archive library (or --start-lib/--end-lib group) |
| 2184 | // that has not changed since the last incremental link. Its contents come |
| 2185 | // from the incremental inputs entry in the base file. |
| 2186 | |
| 2187 | class Incremental_library : public Library_base |
| 2188 | { |
| 2189 | public: |
| 2190 | Incremental_library(const char* filename, unsigned int input_file_index, |
| 2191 | const Incremental_binary::Input_reader* input_reader) |
| 2192 | : Library_base(NULL), filename_(filename), |
| 2193 | input_file_index_(input_file_index), input_reader_(input_reader), |
| 2194 | unused_symbols_(), is_reported_(false) |
| 2195 | { } |
| 2196 | |
| 2197 | // Return the input file index. |
| 2198 | unsigned int |
| 2199 | input_file_index() const |
| 2200 | { return this->input_file_index_; } |
| 2201 | |
| 2202 | // Return the serial number of the input file. |
| 2203 | unsigned int |
| 2204 | arg_serial() const |
| 2205 | { return this->input_reader_->arg_serial(); } |
| 2206 | |
| 2207 | // Copy the unused symbols from the incremental input info. |
| 2208 | // We need to do this because we may be overwriting the incremental |
| 2209 | // input info in the base file before we write the new incremental |
| 2210 | // info. |
| 2211 | void |
| 2212 | copy_unused_symbols(); |
| 2213 | |
| 2214 | // Return FALSE on the first call to indicate that the library needs |
| 2215 | // to be recorded; return TRUE subsequently. |
| 2216 | bool |
| 2217 | is_reported() |
| 2218 | { |
| 2219 | bool was_reported = this->is_reported_; |
| 2220 | is_reported_ = true; |
| 2221 | return was_reported; |
| 2222 | } |
| 2223 | |
| 2224 | private: |
| 2225 | typedef std::vector<std::string> Symbol_list; |
| 2226 | |
| 2227 | // The file name. |
| 2228 | const std::string& |
| 2229 | do_filename() const |
| 2230 | { return this->filename_; } |
| 2231 | |
| 2232 | // Return the modification time of the archive file. |
| 2233 | Timespec |
| 2234 | do_get_mtime() |
| 2235 | { return this->input_reader_->get_mtime(); } |
| 2236 | |
| 2237 | // Iterator for unused global symbols in the library. |
| 2238 | void |
| 2239 | do_for_all_unused_symbols(Symbol_visitor_base* v) const; |
| 2240 | |
| 2241 | // The name of the library. |
| 2242 | std::string filename_; |
| 2243 | // The input file index of this library. |
| 2244 | unsigned int input_file_index_; |
| 2245 | // A reader for the incremental input information. |
| 2246 | const Incremental_binary::Input_reader* input_reader_; |
| 2247 | // List of unused symbols defined in this library. |
| 2248 | Symbol_list unused_symbols_; |
| 2249 | // TRUE when this library has been reported to the new incremental info. |
| 2250 | bool is_reported_; |
| 2251 | }; |
| 2252 | |
| 2253 | } // End namespace gold. |
| 2254 | |
| 2255 | #endif // !defined(GOLD_INCREMENTAL_H) |