| 1 | // readsyms.h -- read input file symbols for gold -*- C++ -*- |
| 2 | |
| 3 | // Copyright (C) 2006-2014 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 | #ifndef GOLD_READSYMS_H |
| 24 | #define GOLD_READSYMS_H |
| 25 | |
| 26 | #include <vector> |
| 27 | |
| 28 | #include "workqueue.h" |
| 29 | #include "object.h" |
| 30 | #include "incremental.h" |
| 31 | |
| 32 | namespace gold |
| 33 | { |
| 34 | |
| 35 | class Input_objects; |
| 36 | class Symbol_table; |
| 37 | class Input_group; |
| 38 | class Archive; |
| 39 | class Finish_group; |
| 40 | |
| 41 | // This Task is responsible for reading the symbols from an input |
| 42 | // file. This also includes reading the relocations so that we can |
| 43 | // check for any that require a PLT and/or a GOT. After the data has |
| 44 | // been read, this queues up another task to actually add the symbols |
| 45 | // to the symbol table. The tasks are separated because the file |
| 46 | // reading can occur in parallel but adding the symbols must be done |
| 47 | // in the order of the input files. |
| 48 | |
| 49 | class Read_symbols : public Task |
| 50 | { |
| 51 | public: |
| 52 | // DIRPATH is the list of directories to search for libraries. |
| 53 | // INPUT is the file to read. INPUT_GROUP is not NULL if we are in |
| 54 | // the middle of an input group. THIS_BLOCKER is used to prevent |
| 55 | // the associated Add_symbols task from running before the previous |
| 56 | // one has completed; it will be NULL for the first task. |
| 57 | // NEXT_BLOCKER is used to block the next input file from adding |
| 58 | // symbols. |
| 59 | Read_symbols(Input_objects* input_objects, Symbol_table* symtab, |
| 60 | Layout* layout, Dirsearch* dirpath, int dirindex, |
| 61 | Mapfile* mapfile, const Input_argument* input_argument, |
| 62 | Input_group* input_group, Archive_member* member, |
| 63 | Task_token* this_blocker, Task_token* next_blocker) |
| 64 | : input_objects_(input_objects), symtab_(symtab), layout_(layout), |
| 65 | dirpath_(dirpath), dirindex_(dirindex), mapfile_(mapfile), |
| 66 | input_argument_(input_argument), input_group_(input_group), |
| 67 | member_(member), this_blocker_(this_blocker), |
| 68 | next_blocker_(next_blocker) |
| 69 | { } |
| 70 | |
| 71 | ~Read_symbols(); |
| 72 | |
| 73 | // If appropriate, issue a warning about skipping an incompatible |
| 74 | // object. |
| 75 | static void |
| 76 | incompatible_warning(const Input_argument*, const Input_file*); |
| 77 | |
| 78 | // Requeue a Read_symbols task to search for the next object with |
| 79 | // the same name. |
| 80 | static void |
| 81 | requeue(Workqueue*, Input_objects*, Symbol_table*, Layout*, Dirsearch*, |
| 82 | int dirindex, Mapfile*, const Input_argument*, Input_group*, |
| 83 | Task_token* next_blocker); |
| 84 | |
| 85 | // The standard Task methods. |
| 86 | |
| 87 | Task_token* |
| 88 | is_runnable(); |
| 89 | |
| 90 | void |
| 91 | locks(Task_locker*); |
| 92 | |
| 93 | void |
| 94 | run(Workqueue*); |
| 95 | |
| 96 | std::string |
| 97 | get_name() const; |
| 98 | |
| 99 | private: |
| 100 | // Handle an archive group. |
| 101 | void |
| 102 | do_group(Workqueue*); |
| 103 | |
| 104 | // Handle --start-lib ... --end-lib |
| 105 | bool |
| 106 | do_lib_group(Workqueue*); |
| 107 | |
| 108 | // Handle --whole-archive --start-lib ... --end-lib --no-whole-archive |
| 109 | bool |
| 110 | do_whole_lib_group(Workqueue*); |
| 111 | |
| 112 | // Open and identify the file. |
| 113 | bool |
| 114 | do_read_symbols(Workqueue*); |
| 115 | |
| 116 | Input_objects* input_objects_; |
| 117 | Symbol_table* symtab_; |
| 118 | Layout* layout_; |
| 119 | Dirsearch* dirpath_; |
| 120 | int dirindex_; |
| 121 | Mapfile* mapfile_; |
| 122 | const Input_argument* input_argument_; |
| 123 | Input_group* input_group_; |
| 124 | Archive_member* member_; |
| 125 | Task_token* this_blocker_; |
| 126 | Task_token* next_blocker_; |
| 127 | }; |
| 128 | |
| 129 | // This Task handles adding the symbols to the symbol table. These |
| 130 | // tasks must be run in the same order as the arguments appear on the |
| 131 | // command line. |
| 132 | |
| 133 | class Add_symbols : public Task |
| 134 | { |
| 135 | public: |
| 136 | // THIS_BLOCKER is used to prevent this task from running before the |
| 137 | // one for the previous input file. NEXT_BLOCKER is used to prevent |
| 138 | // the next task from running. |
| 139 | Add_symbols(Input_objects* input_objects, Symbol_table* symtab, |
| 140 | Layout* layout, Dirsearch* /*dirpath*/, int /*dirindex*/, |
| 141 | Mapfile* /*mapfile*/, const Input_argument* input_argument, |
| 142 | Object* object, Incremental_library* library, |
| 143 | Read_symbols_data* sd, Task_token* this_blocker, |
| 144 | Task_token* next_blocker) |
| 145 | : input_objects_(input_objects), symtab_(symtab), layout_(layout), |
| 146 | input_argument_(input_argument), object_(object), library_(library), |
| 147 | sd_(sd), this_blocker_(this_blocker), next_blocker_(next_blocker) |
| 148 | { } |
| 149 | |
| 150 | ~Add_symbols(); |
| 151 | |
| 152 | // The standard Task methods. |
| 153 | |
| 154 | Task_token* |
| 155 | is_runnable(); |
| 156 | |
| 157 | void |
| 158 | locks(Task_locker*); |
| 159 | |
| 160 | void |
| 161 | run(Workqueue*); |
| 162 | |
| 163 | std::string |
| 164 | get_name() const |
| 165 | { return "Add_symbols " + this->object_->name(); } |
| 166 | |
| 167 | private: |
| 168 | Input_objects* input_objects_; |
| 169 | Symbol_table* symtab_; |
| 170 | Layout* layout_; |
| 171 | const Input_argument* input_argument_; |
| 172 | Object* object_; |
| 173 | Incremental_library* library_; |
| 174 | Read_symbols_data* sd_; |
| 175 | Task_token* this_blocker_; |
| 176 | Task_token* next_blocker_; |
| 177 | }; |
| 178 | |
| 179 | // This Task is responsible for reading the symbols from an archive |
| 180 | // member that has changed since the last incremental link. |
| 181 | |
| 182 | class Read_member : public Task |
| 183 | { |
| 184 | public: |
| 185 | // INPUT is the file to read. INPUT_GROUP is not NULL if we are in |
| 186 | // the middle of an input group. THIS_BLOCKER is used to prevent |
| 187 | // the associated Add_symbols task from running before the previous |
| 188 | // one has completed; it will be NULL for the first task. |
| 189 | // NEXT_BLOCKER is used to block the next input file from adding |
| 190 | // symbols. |
| 191 | Read_member(Input_objects* /*input_objects*/, Symbol_table* /*symtab*/, |
| 192 | Layout* /*layout*/, Mapfile* /*mapfile*/, |
| 193 | const Incremental_binary::Input_reader* input_reader, |
| 194 | Task_token* this_blocker, Task_token* next_blocker) |
| 195 | : input_reader_(input_reader), |
| 196 | this_blocker_(this_blocker), next_blocker_(next_blocker) |
| 197 | { } |
| 198 | |
| 199 | ~Read_member(); |
| 200 | |
| 201 | // The standard Task methods. |
| 202 | |
| 203 | Task_token* |
| 204 | is_runnable(); |
| 205 | |
| 206 | void |
| 207 | locks(Task_locker*); |
| 208 | |
| 209 | void |
| 210 | run(Workqueue*); |
| 211 | |
| 212 | std::string |
| 213 | get_name() const |
| 214 | { |
| 215 | return (std::string("Read_member ") + this->input_reader_->filename()); |
| 216 | } |
| 217 | |
| 218 | private: |
| 219 | const Incremental_binary::Input_reader* input_reader_; |
| 220 | Task_token* this_blocker_; |
| 221 | Task_token* next_blocker_; |
| 222 | }; |
| 223 | |
| 224 | // This Task is responsible for processing an input script file that has |
| 225 | // not changed since the last incremental link. |
| 226 | |
| 227 | class Check_script : public Task |
| 228 | { |
| 229 | public: |
| 230 | Check_script(Layout* layout, Incremental_binary* ibase, |
| 231 | unsigned int input_file_index, |
| 232 | const Incremental_binary::Input_reader* input_reader, |
| 233 | Task_token* this_blocker, Task_token* next_blocker) |
| 234 | : layout_(layout), ibase_(ibase), input_file_index_(input_file_index), |
| 235 | input_reader_(input_reader), this_blocker_(this_blocker), |
| 236 | next_blocker_(next_blocker) |
| 237 | { |
| 238 | this->filename_ = std::string(this->input_reader_->filename()); |
| 239 | } |
| 240 | |
| 241 | ~Check_script(); |
| 242 | |
| 243 | // The standard Task methods. |
| 244 | |
| 245 | Task_token* |
| 246 | is_runnable(); |
| 247 | |
| 248 | void |
| 249 | locks(Task_locker*); |
| 250 | |
| 251 | void |
| 252 | run(Workqueue*); |
| 253 | |
| 254 | std::string |
| 255 | get_name() const |
| 256 | { |
| 257 | return (std::string("Check_script ") + this->input_reader_->filename()); |
| 258 | } |
| 259 | |
| 260 | private: |
| 261 | std::string filename_; |
| 262 | Layout* layout_; |
| 263 | Incremental_binary* ibase_; |
| 264 | unsigned int input_file_index_; |
| 265 | const Incremental_binary::Input_reader* input_reader_; |
| 266 | Task_token* this_blocker_; |
| 267 | Task_token* next_blocker_; |
| 268 | }; |
| 269 | |
| 270 | // This Task is responsible for processing an archive library that has |
| 271 | // not changed since the last incremental link. |
| 272 | |
| 273 | class Check_library : public Task |
| 274 | { |
| 275 | public: |
| 276 | Check_library(Symbol_table* /*symtab*/, Layout* layout, |
| 277 | Incremental_binary* ibase, |
| 278 | unsigned int input_file_index, |
| 279 | const Incremental_binary::Input_reader* input_reader, |
| 280 | Task_token* this_blocker, Task_token* next_blocker) |
| 281 | : layout_(layout), ibase_(ibase), |
| 282 | input_file_index_(input_file_index), input_reader_(input_reader), |
| 283 | this_blocker_(this_blocker), next_blocker_(next_blocker) |
| 284 | { } |
| 285 | |
| 286 | ~Check_library(); |
| 287 | |
| 288 | // The standard Task methods. |
| 289 | |
| 290 | Task_token* |
| 291 | is_runnable(); |
| 292 | |
| 293 | void |
| 294 | locks(Task_locker*); |
| 295 | |
| 296 | void |
| 297 | run(Workqueue*); |
| 298 | |
| 299 | std::string |
| 300 | get_name() const |
| 301 | { |
| 302 | return (std::string("Check_library ") + this->input_reader_->filename()); |
| 303 | } |
| 304 | |
| 305 | private: |
| 306 | Layout* layout_; |
| 307 | Incremental_binary* ibase_; |
| 308 | unsigned int input_file_index_; |
| 309 | const Incremental_binary::Input_reader* input_reader_; |
| 310 | Task_token* this_blocker_; |
| 311 | Task_token* next_blocker_; |
| 312 | }; |
| 313 | |
| 314 | // This class is used to track the archives in a group. |
| 315 | |
| 316 | class Input_group |
| 317 | { |
| 318 | public: |
| 319 | typedef std::vector<Archive*> Archives; |
| 320 | typedef Archives::const_iterator const_iterator; |
| 321 | |
| 322 | Input_group() |
| 323 | : archives_() |
| 324 | { } |
| 325 | |
| 326 | ~Input_group(); |
| 327 | |
| 328 | // Add an archive to the group. |
| 329 | void |
| 330 | add_archive(Archive* arch) |
| 331 | { this->archives_.push_back(arch); } |
| 332 | |
| 333 | // Loop over the archives in the group. |
| 334 | |
| 335 | const_iterator |
| 336 | begin() const |
| 337 | { return this->archives_.begin(); } |
| 338 | |
| 339 | const_iterator |
| 340 | end() const |
| 341 | { return this->archives_.end(); } |
| 342 | |
| 343 | private: |
| 344 | Archives archives_; |
| 345 | }; |
| 346 | |
| 347 | // This class starts the handling of a group. It exists only to pick |
| 348 | // up the number of undefined symbols at that point, so that we only |
| 349 | // run back through the group if we saw a new undefined symbol. |
| 350 | |
| 351 | class Start_group : public Task |
| 352 | { |
| 353 | public: |
| 354 | Start_group(Symbol_table* symtab, Finish_group* finish_group, |
| 355 | Task_token* this_blocker, Task_token* next_blocker) |
| 356 | : symtab_(symtab), finish_group_(finish_group), |
| 357 | this_blocker_(this_blocker), next_blocker_(next_blocker) |
| 358 | { } |
| 359 | |
| 360 | ~Start_group(); |
| 361 | |
| 362 | // The standard Task methods. |
| 363 | |
| 364 | Task_token* |
| 365 | is_runnable(); |
| 366 | |
| 367 | void |
| 368 | locks(Task_locker*); |
| 369 | |
| 370 | void |
| 371 | run(Workqueue*); |
| 372 | |
| 373 | std::string |
| 374 | get_name() const |
| 375 | { return "Start_group"; } |
| 376 | |
| 377 | private: |
| 378 | Symbol_table* symtab_; |
| 379 | Finish_group* finish_group_; |
| 380 | Task_token* this_blocker_; |
| 381 | Task_token* next_blocker_; |
| 382 | }; |
| 383 | |
| 384 | // This class is used to finish up handling a group. It is just a |
| 385 | // closure. |
| 386 | |
| 387 | class Finish_group : public Task |
| 388 | { |
| 389 | public: |
| 390 | Finish_group(Input_objects* input_objects, Symbol_table* symtab, |
| 391 | Layout* layout, Mapfile* mapfile, Input_group* input_group, |
| 392 | Task_token* next_blocker) |
| 393 | : input_objects_(input_objects), symtab_(symtab), |
| 394 | layout_(layout), mapfile_(mapfile), input_group_(input_group), |
| 395 | saw_undefined_(0), this_blocker_(NULL), next_blocker_(next_blocker) |
| 396 | { } |
| 397 | |
| 398 | ~Finish_group(); |
| 399 | |
| 400 | // Set the number of undefined symbols when we start processing the |
| 401 | // group. This is called by the Start_group task. |
| 402 | void |
| 403 | set_saw_undefined(size_t saw_undefined) |
| 404 | { this->saw_undefined_ = saw_undefined; } |
| 405 | |
| 406 | // Set the blocker to use for this task. |
| 407 | void |
| 408 | set_blocker(Task_token* this_blocker) |
| 409 | { |
| 410 | gold_assert(this->this_blocker_ == NULL); |
| 411 | this->this_blocker_ = this_blocker; |
| 412 | } |
| 413 | |
| 414 | // The standard Task methods. |
| 415 | |
| 416 | Task_token* |
| 417 | is_runnable(); |
| 418 | |
| 419 | void |
| 420 | locks(Task_locker*); |
| 421 | |
| 422 | void |
| 423 | run(Workqueue*); |
| 424 | |
| 425 | std::string |
| 426 | get_name() const |
| 427 | { return "Finish_group"; } |
| 428 | |
| 429 | private: |
| 430 | Input_objects* input_objects_; |
| 431 | Symbol_table* symtab_; |
| 432 | Layout* layout_; |
| 433 | Mapfile* mapfile_; |
| 434 | Input_group* input_group_; |
| 435 | size_t saw_undefined_; |
| 436 | Task_token* this_blocker_; |
| 437 | Task_token* next_blocker_; |
| 438 | }; |
| 439 | |
| 440 | // This class is used to read a file which was not recognized as an |
| 441 | // object or archive. It tries to read it as a linker script, using |
| 442 | // the tokens to serialize with the calls to Add_symbols. |
| 443 | |
| 444 | class Read_script : public Task |
| 445 | { |
| 446 | public: |
| 447 | Read_script(Symbol_table* symtab, Layout* layout, Dirsearch* dirpath, |
| 448 | int dirindex, Input_objects* input_objects, Mapfile* mapfile, |
| 449 | Input_group* input_group, const Input_argument* input_argument, |
| 450 | Input_file* input_file, Task_token* this_blocker, |
| 451 | Task_token* next_blocker) |
| 452 | : symtab_(symtab), layout_(layout), dirpath_(dirpath), dirindex_(dirindex), |
| 453 | input_objects_(input_objects), mapfile_(mapfile), |
| 454 | input_group_(input_group), input_argument_(input_argument), |
| 455 | input_file_(input_file), this_blocker_(this_blocker), |
| 456 | next_blocker_(next_blocker) |
| 457 | { } |
| 458 | |
| 459 | ~Read_script(); |
| 460 | |
| 461 | // The standard Task methods. |
| 462 | |
| 463 | Task_token* |
| 464 | is_runnable(); |
| 465 | |
| 466 | void |
| 467 | locks(Task_locker*); |
| 468 | |
| 469 | void |
| 470 | run(Workqueue*); |
| 471 | |
| 472 | std::string |
| 473 | get_name() const; |
| 474 | |
| 475 | private: |
| 476 | Symbol_table* symtab_; |
| 477 | Layout* layout_; |
| 478 | Dirsearch* dirpath_; |
| 479 | int dirindex_; |
| 480 | Input_objects* input_objects_; |
| 481 | Mapfile* mapfile_; |
| 482 | Input_group* input_group_; |
| 483 | const Input_argument* input_argument_; |
| 484 | Input_file* input_file_; |
| 485 | Task_token* this_blocker_; |
| 486 | Task_token* next_blocker_; |
| 487 | }; |
| 488 | |
| 489 | } // end namespace gold |
| 490 | |
| 491 | #endif // !defined(GOLD_READSYMS_H) |