| 1 | // output.h -- manage the output file for gold -*- C++ -*- |
| 2 | |
| 3 | // Copyright 2006, 2007 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_OUTPUT_H |
| 24 | #define GOLD_OUTPUT_H |
| 25 | |
| 26 | #include <list> |
| 27 | #include <vector> |
| 28 | |
| 29 | #include "elfcpp.h" |
| 30 | #include "layout.h" |
| 31 | #include "reloc-types.h" |
| 32 | |
| 33 | namespace gold |
| 34 | { |
| 35 | |
| 36 | class General_options; |
| 37 | class Object; |
| 38 | class Symbol; |
| 39 | class Output_file; |
| 40 | class Output_section; |
| 41 | class Target; |
| 42 | template<int size, bool big_endian> |
| 43 | class Sized_target; |
| 44 | template<int size, bool big_endian> |
| 45 | class Sized_relobj; |
| 46 | |
| 47 | // An abtract class for data which has to go into the output file. |
| 48 | |
| 49 | class Output_data |
| 50 | { |
| 51 | public: |
| 52 | explicit Output_data() |
| 53 | : address_(0), data_size_(0), offset_(-1), |
| 54 | is_address_valid_(false), is_data_size_valid_(false), |
| 55 | is_offset_valid_(false), |
| 56 | dynamic_reloc_count_(0) |
| 57 | { } |
| 58 | |
| 59 | virtual |
| 60 | ~Output_data(); |
| 61 | |
| 62 | // Return the address. For allocated sections, this is only valid |
| 63 | // after Layout::finalize is finished. |
| 64 | uint64_t |
| 65 | address() const |
| 66 | { |
| 67 | gold_assert(this->is_address_valid_); |
| 68 | return this->address_; |
| 69 | } |
| 70 | |
| 71 | // Return the size of the data. For allocated sections, this must |
| 72 | // be valid after Layout::finalize calls set_address, but need not |
| 73 | // be valid before then. |
| 74 | off_t |
| 75 | data_size() const |
| 76 | { |
| 77 | gold_assert(this->is_data_size_valid_); |
| 78 | return this->data_size_; |
| 79 | } |
| 80 | |
| 81 | // Return the file offset. This is only valid after |
| 82 | // Layout::finalize is finished. For some non-allocated sections, |
| 83 | // it may not be valid until near the end of the link. |
| 84 | off_t |
| 85 | offset() const |
| 86 | { |
| 87 | gold_assert(this->is_offset_valid_); |
| 88 | return this->offset_; |
| 89 | } |
| 90 | |
| 91 | // Return the required alignment. |
| 92 | uint64_t |
| 93 | addralign() const |
| 94 | { return this->do_addralign(); } |
| 95 | |
| 96 | // Return whether this is an Output_section. |
| 97 | bool |
| 98 | is_section() const |
| 99 | { return this->do_is_section(); } |
| 100 | |
| 101 | // Return whether this is an Output_section of the specified type. |
| 102 | bool |
| 103 | is_section_type(elfcpp::Elf_Word stt) const |
| 104 | { return this->do_is_section_type(stt); } |
| 105 | |
| 106 | // Return whether this is an Output_section with the specified flag |
| 107 | // set. |
| 108 | bool |
| 109 | is_section_flag_set(elfcpp::Elf_Xword shf) const |
| 110 | { return this->do_is_section_flag_set(shf); } |
| 111 | |
| 112 | // Return the output section index, if there is an output section. |
| 113 | unsigned int |
| 114 | out_shndx() const |
| 115 | { return this->do_out_shndx(); } |
| 116 | |
| 117 | // Set the output section index, if this is an output section. |
| 118 | void |
| 119 | set_out_shndx(unsigned int shndx) |
| 120 | { this->do_set_out_shndx(shndx); } |
| 121 | |
| 122 | // Set the address and file offset of this data, and finalize the |
| 123 | // size of the data. This is called during Layout::finalize for |
| 124 | // allocated sections. |
| 125 | void |
| 126 | set_address_and_file_offset(uint64_t addr, off_t off) |
| 127 | { |
| 128 | this->set_address(addr); |
| 129 | this->set_file_offset(off); |
| 130 | this->finalize_data_size(); |
| 131 | } |
| 132 | |
| 133 | // Set the address. |
| 134 | void |
| 135 | set_address(uint64_t addr) |
| 136 | { |
| 137 | gold_assert(!this->is_address_valid_); |
| 138 | this->address_ = addr; |
| 139 | this->is_address_valid_ = true; |
| 140 | } |
| 141 | |
| 142 | // Set the file offset. |
| 143 | void |
| 144 | set_file_offset(off_t off) |
| 145 | { |
| 146 | gold_assert(!this->is_offset_valid_); |
| 147 | this->offset_ = off; |
| 148 | this->is_offset_valid_ = true; |
| 149 | } |
| 150 | |
| 151 | // Finalize the data size. |
| 152 | void |
| 153 | finalize_data_size() |
| 154 | { |
| 155 | if (!this->is_data_size_valid_) |
| 156 | { |
| 157 | // Tell the child class to set the data size. |
| 158 | this->set_final_data_size(); |
| 159 | gold_assert(this->is_data_size_valid_); |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | // Set the TLS offset. Called only for SHT_TLS sections. |
| 164 | void |
| 165 | set_tls_offset(uint64_t tls_base) |
| 166 | { this->do_set_tls_offset(tls_base); } |
| 167 | |
| 168 | // Return the TLS offset, relative to the base of the TLS segment. |
| 169 | // Valid only for SHT_TLS sections. |
| 170 | uint64_t |
| 171 | tls_offset() const |
| 172 | { return this->do_tls_offset(); } |
| 173 | |
| 174 | // Write the data to the output file. This is called after |
| 175 | // Layout::finalize is complete. |
| 176 | void |
| 177 | write(Output_file* file) |
| 178 | { this->do_write(file); } |
| 179 | |
| 180 | // This is called by Layout::finalize to note that the sizes of |
| 181 | // allocated sections must now be fixed. |
| 182 | static void |
| 183 | layout_complete() |
| 184 | { Output_data::allocated_sizes_are_fixed = true; } |
| 185 | |
| 186 | // Used to check that layout has been done. |
| 187 | static bool |
| 188 | is_layout_complete() |
| 189 | { return Output_data::allocated_sizes_are_fixed; } |
| 190 | |
| 191 | // Count the number of dynamic relocations applied to this section. |
| 192 | void |
| 193 | add_dynamic_reloc() |
| 194 | { ++this->dynamic_reloc_count_; } |
| 195 | |
| 196 | // Return the number of dynamic relocations applied to this section. |
| 197 | unsigned int |
| 198 | dynamic_reloc_count() const |
| 199 | { return this->dynamic_reloc_count_; } |
| 200 | |
| 201 | protected: |
| 202 | // Functions that child classes may or in some cases must implement. |
| 203 | |
| 204 | // Write the data to the output file. |
| 205 | virtual void |
| 206 | do_write(Output_file*) = 0; |
| 207 | |
| 208 | // Return the required alignment. |
| 209 | virtual uint64_t |
| 210 | do_addralign() const = 0; |
| 211 | |
| 212 | // Return whether this is an Output_section. |
| 213 | virtual bool |
| 214 | do_is_section() const |
| 215 | { return false; } |
| 216 | |
| 217 | // Return whether this is an Output_section of the specified type. |
| 218 | // This only needs to be implement by Output_section. |
| 219 | virtual bool |
| 220 | do_is_section_type(elfcpp::Elf_Word) const |
| 221 | { return false; } |
| 222 | |
| 223 | // Return whether this is an Output_section with the specific flag |
| 224 | // set. This only needs to be implemented by Output_section. |
| 225 | virtual bool |
| 226 | do_is_section_flag_set(elfcpp::Elf_Xword) const |
| 227 | { return false; } |
| 228 | |
| 229 | // Return the output section index, if there is an output section. |
| 230 | virtual unsigned int |
| 231 | do_out_shndx() const |
| 232 | { gold_unreachable(); } |
| 233 | |
| 234 | // Set the output section index, if this is an output section. |
| 235 | virtual void |
| 236 | do_set_out_shndx(unsigned int) |
| 237 | { gold_unreachable(); } |
| 238 | |
| 239 | // This is a hook for derived classes to set the data size. This is |
| 240 | // called by finalize_data_size, normally called during |
| 241 | // Layout::finalize, when the section address is set. |
| 242 | virtual void |
| 243 | set_final_data_size() |
| 244 | { gold_unreachable(); } |
| 245 | |
| 246 | // Set the TLS offset. Called only for SHT_TLS sections. |
| 247 | virtual void |
| 248 | do_set_tls_offset(uint64_t) |
| 249 | { gold_unreachable(); } |
| 250 | |
| 251 | // Return the TLS offset, relative to the base of the TLS segment. |
| 252 | // Valid only for SHT_TLS sections. |
| 253 | virtual uint64_t |
| 254 | do_tls_offset() const |
| 255 | { gold_unreachable(); } |
| 256 | |
| 257 | // Functions that child classes may call. |
| 258 | |
| 259 | // Whether the address is valid. |
| 260 | bool |
| 261 | is_address_valid() const |
| 262 | { return this->is_address_valid_; } |
| 263 | |
| 264 | // Whether the file offset is valid. |
| 265 | bool |
| 266 | is_offset_valid() const |
| 267 | { return this->is_offset_valid_; } |
| 268 | |
| 269 | // Whether the data size is valid. |
| 270 | bool |
| 271 | is_data_size_valid() const |
| 272 | { return this->is_data_size_valid_; } |
| 273 | |
| 274 | // Set the size of the data. |
| 275 | void |
| 276 | set_data_size(off_t data_size) |
| 277 | { |
| 278 | gold_assert(!this->is_data_size_valid_); |
| 279 | this->data_size_ = data_size; |
| 280 | this->is_data_size_valid_ = true; |
| 281 | } |
| 282 | |
| 283 | // Get the current data size--this is for the convenience of |
| 284 | // sections which build up their size over time. |
| 285 | off_t |
| 286 | current_data_size_for_child() const |
| 287 | { return this->data_size_; } |
| 288 | |
| 289 | // Set the current data size--this is for the convenience of |
| 290 | // sections which build up their size over time. |
| 291 | void |
| 292 | set_current_data_size_for_child(off_t data_size) |
| 293 | { |
| 294 | gold_assert(!this->is_data_size_valid_); |
| 295 | this->data_size_ = data_size; |
| 296 | } |
| 297 | |
| 298 | // Return default alignment for the target size. |
| 299 | static uint64_t |
| 300 | default_alignment(); |
| 301 | |
| 302 | // Return default alignment for a specified size--32 or 64. |
| 303 | static uint64_t |
| 304 | default_alignment_for_size(int size); |
| 305 | |
| 306 | private: |
| 307 | Output_data(const Output_data&); |
| 308 | Output_data& operator=(const Output_data&); |
| 309 | |
| 310 | // This is used for verification, to make sure that we don't try to |
| 311 | // change any sizes of allocated sections after we set the section |
| 312 | // addresses. |
| 313 | static bool allocated_sizes_are_fixed; |
| 314 | |
| 315 | // Memory address in output file. |
| 316 | uint64_t address_; |
| 317 | // Size of data in output file. |
| 318 | off_t data_size_; |
| 319 | // File offset of contents in output file. |
| 320 | off_t offset_; |
| 321 | // Whether address_ is valid. |
| 322 | bool is_address_valid_; |
| 323 | // Whether data_size_ is valid. |
| 324 | bool is_data_size_valid_; |
| 325 | // Whether offset_ is valid. |
| 326 | bool is_offset_valid_; |
| 327 | // Count of dynamic relocations applied to this section. |
| 328 | unsigned int dynamic_reloc_count_; |
| 329 | }; |
| 330 | |
| 331 | // Output the section headers. |
| 332 | |
| 333 | class Output_section_headers : public Output_data |
| 334 | { |
| 335 | public: |
| 336 | Output_section_headers(const Layout*, |
| 337 | const Layout::Segment_list*, |
| 338 | const Layout::Section_list*, |
| 339 | const Stringpool*); |
| 340 | |
| 341 | protected: |
| 342 | // Write the data to the file. |
| 343 | void |
| 344 | do_write(Output_file*); |
| 345 | |
| 346 | // Return the required alignment. |
| 347 | uint64_t |
| 348 | do_addralign() const |
| 349 | { return Output_data::default_alignment(); } |
| 350 | |
| 351 | private: |
| 352 | // Write the data to the file with the right size and endianness. |
| 353 | template<int size, bool big_endian> |
| 354 | void |
| 355 | do_sized_write(Output_file*); |
| 356 | |
| 357 | const Layout* layout_; |
| 358 | const Layout::Segment_list* segment_list_; |
| 359 | const Layout::Section_list* unattached_section_list_; |
| 360 | const Stringpool* secnamepool_; |
| 361 | }; |
| 362 | |
| 363 | // Output the segment headers. |
| 364 | |
| 365 | class Output_segment_headers : public Output_data |
| 366 | { |
| 367 | public: |
| 368 | Output_segment_headers(const Layout::Segment_list& segment_list); |
| 369 | |
| 370 | protected: |
| 371 | // Write the data to the file. |
| 372 | void |
| 373 | do_write(Output_file*); |
| 374 | |
| 375 | // Return the required alignment. |
| 376 | uint64_t |
| 377 | do_addralign() const |
| 378 | { return Output_data::default_alignment(); } |
| 379 | |
| 380 | private: |
| 381 | // Write the data to the file with the right size and endianness. |
| 382 | template<int size, bool big_endian> |
| 383 | void |
| 384 | do_sized_write(Output_file*); |
| 385 | |
| 386 | const Layout::Segment_list& segment_list_; |
| 387 | }; |
| 388 | |
| 389 | // Output the ELF file header. |
| 390 | |
| 391 | class Output_file_header : public Output_data |
| 392 | { |
| 393 | public: |
| 394 | Output_file_header(const Target*, |
| 395 | const Symbol_table*, |
| 396 | const Output_segment_headers*); |
| 397 | |
| 398 | // Add information about the section headers. We lay out the ELF |
| 399 | // file header before we create the section headers. |
| 400 | void set_section_info(const Output_section_headers*, |
| 401 | const Output_section* shstrtab); |
| 402 | |
| 403 | protected: |
| 404 | // Write the data to the file. |
| 405 | void |
| 406 | do_write(Output_file*); |
| 407 | |
| 408 | // Return the required alignment. |
| 409 | uint64_t |
| 410 | do_addralign() const |
| 411 | { return Output_data::default_alignment(); } |
| 412 | |
| 413 | private: |
| 414 | // Write the data to the file with the right size and endianness. |
| 415 | template<int size, bool big_endian> |
| 416 | void |
| 417 | do_sized_write(Output_file*); |
| 418 | |
| 419 | const Target* target_; |
| 420 | const Symbol_table* symtab_; |
| 421 | const Output_segment_headers* segment_header_; |
| 422 | const Output_section_headers* section_header_; |
| 423 | const Output_section* shstrtab_; |
| 424 | }; |
| 425 | |
| 426 | // Output sections are mainly comprised of input sections. However, |
| 427 | // there are cases where we have data to write out which is not in an |
| 428 | // input section. Output_section_data is used in such cases. This is |
| 429 | // an abstract base class. |
| 430 | |
| 431 | class Output_section_data : public Output_data |
| 432 | { |
| 433 | public: |
| 434 | Output_section_data(off_t data_size, uint64_t addralign) |
| 435 | : Output_data(), output_section_(NULL), addralign_(addralign) |
| 436 | { this->set_data_size(data_size); } |
| 437 | |
| 438 | Output_section_data(uint64_t addralign) |
| 439 | : Output_data(), output_section_(NULL), addralign_(addralign) |
| 440 | { } |
| 441 | |
| 442 | // Return the output section. |
| 443 | const Output_section* |
| 444 | output_section() const |
| 445 | { return this->output_section_; } |
| 446 | |
| 447 | // Record the output section. |
| 448 | void |
| 449 | set_output_section(Output_section* os); |
| 450 | |
| 451 | // Add an input section, for SHF_MERGE sections. This returns true |
| 452 | // if the section was handled. |
| 453 | bool |
| 454 | add_input_section(Relobj* object, unsigned int shndx) |
| 455 | { return this->do_add_input_section(object, shndx); } |
| 456 | |
| 457 | // Given an input OBJECT, an input section index SHNDX within that |
| 458 | // object, and an OFFSET relative to the start of that input |
| 459 | // section, return whether or not the corresponding offset within |
| 460 | // the output section is known. If this function returns true, it |
| 461 | // sets *POUTPUT to the output offset. The value -1 indicates that |
| 462 | // this input offset is being discarded. |
| 463 | bool |
| 464 | output_offset(const Relobj* object, unsigned int shndx, |
| 465 | section_offset_type offset, |
| 466 | section_offset_type *poutput) const |
| 467 | { return this->do_output_offset(object, shndx, offset, poutput); } |
| 468 | |
| 469 | // Write the contents to a buffer. This is used for sections which |
| 470 | // require postprocessing, such as compression. |
| 471 | void |
| 472 | write_to_buffer(unsigned char* buffer) |
| 473 | { this->do_write_to_buffer(buffer); } |
| 474 | |
| 475 | // Print merge stats to stderr. This should only be called for |
| 476 | // SHF_MERGE sections. |
| 477 | void |
| 478 | print_merge_stats(const char* section_name) |
| 479 | { this->do_print_merge_stats(section_name); } |
| 480 | |
| 481 | protected: |
| 482 | // The child class must implement do_write. |
| 483 | |
| 484 | // The child class may implement specific adjustments to the output |
| 485 | // section. |
| 486 | virtual void |
| 487 | do_adjust_output_section(Output_section*) |
| 488 | { } |
| 489 | |
| 490 | // May be implemented by child class. Return true if the section |
| 491 | // was handled. |
| 492 | virtual bool |
| 493 | do_add_input_section(Relobj*, unsigned int) |
| 494 | { gold_unreachable(); } |
| 495 | |
| 496 | // The child class may implement output_offset. |
| 497 | virtual bool |
| 498 | do_output_offset(const Relobj*, unsigned int, section_offset_type, |
| 499 | section_offset_type*) const |
| 500 | { return false; } |
| 501 | |
| 502 | // The child class may implement write_to_buffer. Most child |
| 503 | // classes can not appear in a compressed section, and they do not |
| 504 | // implement this. |
| 505 | virtual void |
| 506 | do_write_to_buffer(unsigned char*) |
| 507 | { gold_unreachable(); } |
| 508 | |
| 509 | // Print merge statistics. |
| 510 | virtual void |
| 511 | do_print_merge_stats(const char*) |
| 512 | { gold_unreachable(); } |
| 513 | |
| 514 | // Return the required alignment. |
| 515 | uint64_t |
| 516 | do_addralign() const |
| 517 | { return this->addralign_; } |
| 518 | |
| 519 | // Return the section index of the output section. |
| 520 | unsigned int |
| 521 | do_out_shndx() const; |
| 522 | |
| 523 | // Set the alignment. |
| 524 | void |
| 525 | set_addralign(uint64_t addralign) |
| 526 | { this->addralign_ = addralign; } |
| 527 | |
| 528 | private: |
| 529 | // The output section for this section. |
| 530 | const Output_section* output_section_; |
| 531 | // The required alignment. |
| 532 | uint64_t addralign_; |
| 533 | }; |
| 534 | |
| 535 | // Some Output_section_data classes build up their data step by step, |
| 536 | // rather than all at once. This class provides an interface for |
| 537 | // them. |
| 538 | |
| 539 | class Output_section_data_build : public Output_section_data |
| 540 | { |
| 541 | public: |
| 542 | Output_section_data_build(uint64_t addralign) |
| 543 | : Output_section_data(addralign) |
| 544 | { } |
| 545 | |
| 546 | // Get the current data size. |
| 547 | off_t |
| 548 | current_data_size() const |
| 549 | { return this->current_data_size_for_child(); } |
| 550 | |
| 551 | // Set the current data size. |
| 552 | void |
| 553 | set_current_data_size(off_t data_size) |
| 554 | { this->set_current_data_size_for_child(data_size); } |
| 555 | |
| 556 | protected: |
| 557 | // Set the final data size. |
| 558 | virtual void |
| 559 | set_final_data_size() |
| 560 | { this->set_data_size(this->current_data_size_for_child()); } |
| 561 | }; |
| 562 | |
| 563 | // A simple case of Output_data in which we have constant data to |
| 564 | // output. |
| 565 | |
| 566 | class Output_data_const : public Output_section_data |
| 567 | { |
| 568 | public: |
| 569 | Output_data_const(const std::string& data, uint64_t addralign) |
| 570 | : Output_section_data(data.size(), addralign), data_(data) |
| 571 | { } |
| 572 | |
| 573 | Output_data_const(const char* p, off_t len, uint64_t addralign) |
| 574 | : Output_section_data(len, addralign), data_(p, len) |
| 575 | { } |
| 576 | |
| 577 | Output_data_const(const unsigned char* p, off_t len, uint64_t addralign) |
| 578 | : Output_section_data(len, addralign), |
| 579 | data_(reinterpret_cast<const char*>(p), len) |
| 580 | { } |
| 581 | |
| 582 | protected: |
| 583 | // Write the data to the output file. |
| 584 | void |
| 585 | do_write(Output_file*); |
| 586 | |
| 587 | // Write the data to a buffer. |
| 588 | void |
| 589 | do_write_to_buffer(unsigned char* buffer) |
| 590 | { memcpy(buffer, this->data_.data(), this->data_.size()); } |
| 591 | |
| 592 | private: |
| 593 | std::string data_; |
| 594 | }; |
| 595 | |
| 596 | // Another version of Output_data with constant data, in which the |
| 597 | // buffer is allocated by the caller. |
| 598 | |
| 599 | class Output_data_const_buffer : public Output_section_data |
| 600 | { |
| 601 | public: |
| 602 | Output_data_const_buffer(const unsigned char* p, off_t len, |
| 603 | uint64_t addralign) |
| 604 | : Output_section_data(len, addralign), p_(p) |
| 605 | { } |
| 606 | |
| 607 | protected: |
| 608 | // Write the data the output file. |
| 609 | void |
| 610 | do_write(Output_file*); |
| 611 | |
| 612 | // Write the data to a buffer. |
| 613 | void |
| 614 | do_write_to_buffer(unsigned char* buffer) |
| 615 | { memcpy(buffer, this->p_, this->data_size()); } |
| 616 | |
| 617 | private: |
| 618 | const unsigned char* p_; |
| 619 | }; |
| 620 | |
| 621 | // A place holder for a fixed amount of data written out via some |
| 622 | // other mechanism. |
| 623 | |
| 624 | class Output_data_fixed_space : public Output_section_data |
| 625 | { |
| 626 | public: |
| 627 | Output_data_fixed_space(off_t data_size, uint64_t addralign) |
| 628 | : Output_section_data(data_size, addralign) |
| 629 | { } |
| 630 | |
| 631 | protected: |
| 632 | // Write out the data--the actual data must be written out |
| 633 | // elsewhere. |
| 634 | void |
| 635 | do_write(Output_file*) |
| 636 | { } |
| 637 | }; |
| 638 | |
| 639 | // A place holder for variable sized data written out via some other |
| 640 | // mechanism. |
| 641 | |
| 642 | class Output_data_space : public Output_section_data_build |
| 643 | { |
| 644 | public: |
| 645 | explicit Output_data_space(uint64_t addralign) |
| 646 | : Output_section_data_build(addralign) |
| 647 | { } |
| 648 | |
| 649 | // Set the alignment. |
| 650 | void |
| 651 | set_space_alignment(uint64_t align) |
| 652 | { this->set_addralign(align); } |
| 653 | |
| 654 | protected: |
| 655 | // Write out the data--the actual data must be written out |
| 656 | // elsewhere. |
| 657 | void |
| 658 | do_write(Output_file*) |
| 659 | { } |
| 660 | }; |
| 661 | |
| 662 | // A string table which goes into an output section. |
| 663 | |
| 664 | class Output_data_strtab : public Output_section_data |
| 665 | { |
| 666 | public: |
| 667 | Output_data_strtab(Stringpool* strtab) |
| 668 | : Output_section_data(1), strtab_(strtab) |
| 669 | { } |
| 670 | |
| 671 | protected: |
| 672 | // This is called to set the address and file offset. Here we make |
| 673 | // sure that the Stringpool is finalized. |
| 674 | void |
| 675 | set_final_data_size(); |
| 676 | |
| 677 | // Write out the data. |
| 678 | void |
| 679 | do_write(Output_file*); |
| 680 | |
| 681 | // Write the data to a buffer. |
| 682 | void |
| 683 | do_write_to_buffer(unsigned char* buffer) |
| 684 | { this->strtab_->write_to_buffer(buffer, this->data_size()); } |
| 685 | |
| 686 | private: |
| 687 | Stringpool* strtab_; |
| 688 | }; |
| 689 | |
| 690 | // This POD class is used to represent a single reloc in the output |
| 691 | // file. This could be a private class within Output_data_reloc, but |
| 692 | // the templatization is complex enough that I broke it out into a |
| 693 | // separate class. The class is templatized on either elfcpp::SHT_REL |
| 694 | // or elfcpp::SHT_RELA, and also on whether this is a dynamic |
| 695 | // relocation or an ordinary relocation. |
| 696 | |
| 697 | // A relocation can be against a global symbol, a local symbol, an |
| 698 | // output section, or the undefined symbol at index 0. We represent |
| 699 | // the latter by using a NULL global symbol. |
| 700 | |
| 701 | template<int sh_type, bool dynamic, int size, bool big_endian> |
| 702 | class Output_reloc; |
| 703 | |
| 704 | template<bool dynamic, int size, bool big_endian> |
| 705 | class Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> |
| 706 | { |
| 707 | public: |
| 708 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 709 | |
| 710 | // An uninitialized entry. We need this because we want to put |
| 711 | // instances of this class into an STL container. |
| 712 | Output_reloc() |
| 713 | : local_sym_index_(INVALID_CODE) |
| 714 | { } |
| 715 | |
| 716 | // A reloc against a global symbol. |
| 717 | |
| 718 | Output_reloc(Symbol* gsym, unsigned int type, Output_data* od, |
| 719 | Address address, bool is_relative); |
| 720 | |
| 721 | Output_reloc(Symbol* gsym, unsigned int type, Relobj* relobj, |
| 722 | unsigned int shndx, Address address, bool is_relative); |
| 723 | |
| 724 | // A reloc against a local symbol. |
| 725 | |
| 726 | Output_reloc(Sized_relobj<size, big_endian>* relobj, |
| 727 | unsigned int local_sym_index, unsigned int type, |
| 728 | Output_data* od, Address address, bool is_relative); |
| 729 | |
| 730 | Output_reloc(Sized_relobj<size, big_endian>* relobj, |
| 731 | unsigned int local_sym_index, unsigned int type, |
| 732 | unsigned int shndx, Address address, bool is_relative); |
| 733 | |
| 734 | // A reloc against the STT_SECTION symbol of an output section. |
| 735 | |
| 736 | Output_reloc(Output_section* os, unsigned int type, Output_data* od, |
| 737 | Address address); |
| 738 | |
| 739 | Output_reloc(Output_section* os, unsigned int type, Relobj* relobj, |
| 740 | unsigned int shndx, Address address); |
| 741 | |
| 742 | // Return TRUE if this is a RELATIVE relocation. |
| 743 | bool |
| 744 | is_relative() const |
| 745 | { return this->is_relative_; } |
| 746 | |
| 747 | // Get the value of the symbol referred to by a Rel relocation. |
| 748 | |
| 749 | Address |
| 750 | symbol_value() const; |
| 751 | |
| 752 | // Write the reloc entry to an output view. |
| 753 | void |
| 754 | write(unsigned char* pov) const; |
| 755 | |
| 756 | // Write the offset and info fields to Write_rel. |
| 757 | template<typename Write_rel> |
| 758 | void write_rel(Write_rel*) const; |
| 759 | |
| 760 | private: |
| 761 | // Return the symbol index. We can't do a double template |
| 762 | // specialization, so we do a secondary template here. |
| 763 | unsigned int |
| 764 | get_symbol_index() const; |
| 765 | |
| 766 | // Codes for local_sym_index_. |
| 767 | enum |
| 768 | { |
| 769 | // Global symbol. |
| 770 | GSYM_CODE = -1U, |
| 771 | // Output section. |
| 772 | SECTION_CODE = -2U, |
| 773 | // Invalid uninitialized entry. |
| 774 | INVALID_CODE = -3U |
| 775 | }; |
| 776 | |
| 777 | union |
| 778 | { |
| 779 | // For a local symbol, the object. We will never generate a |
| 780 | // relocation against a local symbol in a dynamic object; that |
| 781 | // doesn't make sense. And our callers will always be |
| 782 | // templatized, so we use Sized_relobj here. |
| 783 | Sized_relobj<size, big_endian>* relobj; |
| 784 | // For a global symbol, the symbol. If this is NULL, it indicates |
| 785 | // a relocation against the undefined 0 symbol. |
| 786 | Symbol* gsym; |
| 787 | // For a relocation against an output section, the output section. |
| 788 | Output_section* os; |
| 789 | } u1_; |
| 790 | union |
| 791 | { |
| 792 | // If shndx_ is not INVALID CODE, the object which holds the input |
| 793 | // section being used to specify the reloc address. |
| 794 | Relobj* relobj; |
| 795 | // If shndx_ is INVALID_CODE, the output data being used to |
| 796 | // specify the reloc address. This may be NULL if the reloc |
| 797 | // address is absolute. |
| 798 | Output_data* od; |
| 799 | } u2_; |
| 800 | // The address offset within the input section or the Output_data. |
| 801 | Address address_; |
| 802 | // For a local symbol, the local symbol index. This is GSYM_CODE |
| 803 | // for a global symbol, or INVALID_CODE for an uninitialized value. |
| 804 | unsigned int local_sym_index_; |
| 805 | // The reloc type--a processor specific code. |
| 806 | unsigned int type_ : 31; |
| 807 | // True if the relocation is a RELATIVE relocation. |
| 808 | bool is_relative_ : 1; |
| 809 | // If the reloc address is an input section in an object, the |
| 810 | // section index. This is INVALID_CODE if the reloc address is |
| 811 | // specified in some other way. |
| 812 | unsigned int shndx_; |
| 813 | }; |
| 814 | |
| 815 | // The SHT_RELA version of Output_reloc<>. This is just derived from |
| 816 | // the SHT_REL version of Output_reloc, but it adds an addend. |
| 817 | |
| 818 | template<bool dynamic, int size, bool big_endian> |
| 819 | class Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian> |
| 820 | { |
| 821 | public: |
| 822 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 823 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend; |
| 824 | |
| 825 | // An uninitialized entry. |
| 826 | Output_reloc() |
| 827 | : rel_() |
| 828 | { } |
| 829 | |
| 830 | // A reloc against a global symbol. |
| 831 | |
| 832 | Output_reloc(Symbol* gsym, unsigned int type, Output_data* od, |
| 833 | Address address, Addend addend, bool is_relative) |
| 834 | : rel_(gsym, type, od, address, is_relative), addend_(addend) |
| 835 | { } |
| 836 | |
| 837 | Output_reloc(Symbol* gsym, unsigned int type, Relobj* relobj, |
| 838 | unsigned int shndx, Address address, Addend addend, |
| 839 | bool is_relative) |
| 840 | : rel_(gsym, type, relobj, shndx, address, is_relative), addend_(addend) |
| 841 | { } |
| 842 | |
| 843 | // A reloc against a local symbol. |
| 844 | |
| 845 | Output_reloc(Sized_relobj<size, big_endian>* relobj, |
| 846 | unsigned int local_sym_index, unsigned int type, |
| 847 | Output_data* od, Address address, |
| 848 | Addend addend, bool is_relative) |
| 849 | : rel_(relobj, local_sym_index, type, od, address, is_relative), |
| 850 | addend_(addend) |
| 851 | { } |
| 852 | |
| 853 | Output_reloc(Sized_relobj<size, big_endian>* relobj, |
| 854 | unsigned int local_sym_index, unsigned int type, |
| 855 | unsigned int shndx, Address address, |
| 856 | Addend addend, bool is_relative) |
| 857 | : rel_(relobj, local_sym_index, type, shndx, address, is_relative), |
| 858 | addend_(addend) |
| 859 | { } |
| 860 | |
| 861 | // A reloc against the STT_SECTION symbol of an output section. |
| 862 | |
| 863 | Output_reloc(Output_section* os, unsigned int type, Output_data* od, |
| 864 | Address address, Addend addend) |
| 865 | : rel_(os, type, od, address), addend_(addend) |
| 866 | { } |
| 867 | |
| 868 | Output_reloc(Output_section* os, unsigned int type, Relobj* relobj, |
| 869 | unsigned int shndx, Address address, Addend addend) |
| 870 | : rel_(os, type, relobj, shndx, address), addend_(addend) |
| 871 | { } |
| 872 | |
| 873 | // Write the reloc entry to an output view. |
| 874 | void |
| 875 | write(unsigned char* pov) const; |
| 876 | |
| 877 | private: |
| 878 | // The basic reloc. |
| 879 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> rel_; |
| 880 | // The addend. |
| 881 | Addend addend_; |
| 882 | }; |
| 883 | |
| 884 | // Output_data_reloc is used to manage a section containing relocs. |
| 885 | // SH_TYPE is either elfcpp::SHT_REL or elfcpp::SHT_RELA. DYNAMIC |
| 886 | // indicates whether this is a dynamic relocation or a normal |
| 887 | // relocation. Output_data_reloc_base is a base class. |
| 888 | // Output_data_reloc is the real class, which we specialize based on |
| 889 | // the reloc type. |
| 890 | |
| 891 | template<int sh_type, bool dynamic, int size, bool big_endian> |
| 892 | class Output_data_reloc_base : public Output_section_data_build |
| 893 | { |
| 894 | public: |
| 895 | typedef Output_reloc<sh_type, dynamic, size, big_endian> Output_reloc_type; |
| 896 | typedef typename Output_reloc_type::Address Address; |
| 897 | static const int reloc_size = |
| 898 | Reloc_types<sh_type, size, big_endian>::reloc_size; |
| 899 | |
| 900 | // Construct the section. |
| 901 | Output_data_reloc_base() |
| 902 | : Output_section_data_build(Output_data::default_alignment_for_size(size)) |
| 903 | { } |
| 904 | |
| 905 | protected: |
| 906 | // Write out the data. |
| 907 | void |
| 908 | do_write(Output_file*); |
| 909 | |
| 910 | // Set the entry size and the link. |
| 911 | void |
| 912 | do_adjust_output_section(Output_section *os); |
| 913 | |
| 914 | // Add a relocation entry. |
| 915 | void |
| 916 | add(Output_data *od, const Output_reloc_type& reloc) |
| 917 | { |
| 918 | this->relocs_.push_back(reloc); |
| 919 | this->set_current_data_size(this->relocs_.size() * reloc_size); |
| 920 | od->add_dynamic_reloc(); |
| 921 | } |
| 922 | |
| 923 | private: |
| 924 | typedef std::vector<Output_reloc_type> Relocs; |
| 925 | |
| 926 | Relocs relocs_; |
| 927 | }; |
| 928 | |
| 929 | // The class which callers actually create. |
| 930 | |
| 931 | template<int sh_type, bool dynamic, int size, bool big_endian> |
| 932 | class Output_data_reloc; |
| 933 | |
| 934 | // The SHT_REL version of Output_data_reloc. |
| 935 | |
| 936 | template<bool dynamic, int size, bool big_endian> |
| 937 | class Output_data_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> |
| 938 | : public Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian> |
| 939 | { |
| 940 | private: |
| 941 | typedef Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, |
| 942 | big_endian> Base; |
| 943 | |
| 944 | public: |
| 945 | typedef typename Base::Output_reloc_type Output_reloc_type; |
| 946 | typedef typename Output_reloc_type::Address Address; |
| 947 | |
| 948 | Output_data_reloc() |
| 949 | : Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>() |
| 950 | { } |
| 951 | |
| 952 | // Add a reloc against a global symbol. |
| 953 | |
| 954 | void |
| 955 | add_global(Symbol* gsym, unsigned int type, Output_data* od, Address address) |
| 956 | { this->add(od, Output_reloc_type(gsym, type, od, address, false)); } |
| 957 | |
| 958 | void |
| 959 | add_global(Symbol* gsym, unsigned int type, Output_data* od, Relobj* relobj, |
| 960 | unsigned int shndx, Address address) |
| 961 | { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address, |
| 962 | false)); } |
| 963 | |
| 964 | // Add a RELATIVE reloc against a global symbol. The final relocation |
| 965 | // will not reference the symbol. |
| 966 | |
| 967 | void |
| 968 | add_global_relative(Symbol* gsym, unsigned int type, Output_data* od, |
| 969 | Address address) |
| 970 | { this->add(od, Output_reloc_type(gsym, type, od, address, true)); } |
| 971 | |
| 972 | void |
| 973 | add_global_relative(Symbol* gsym, unsigned int type, Output_data* od, |
| 974 | Relobj* relobj, unsigned int shndx, Address address) |
| 975 | { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address, |
| 976 | true)); } |
| 977 | |
| 978 | // Add a reloc against a local symbol. |
| 979 | |
| 980 | void |
| 981 | add_local(Sized_relobj<size, big_endian>* relobj, |
| 982 | unsigned int local_sym_index, unsigned int type, |
| 983 | Output_data* od, Address address) |
| 984 | { this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, |
| 985 | address, false)); } |
| 986 | |
| 987 | void |
| 988 | add_local(Sized_relobj<size, big_endian>* relobj, |
| 989 | unsigned int local_sym_index, unsigned int type, |
| 990 | Output_data* od, unsigned int shndx, Address address) |
| 991 | { this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx, |
| 992 | address, false)); } |
| 993 | |
| 994 | // Add a RELATIVE reloc against a local symbol. |
| 995 | |
| 996 | void |
| 997 | add_local_relative(Sized_relobj<size, big_endian>* relobj, |
| 998 | unsigned int local_sym_index, unsigned int type, |
| 999 | Output_data* od, Address address) |
| 1000 | { this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, |
| 1001 | address, true)); } |
| 1002 | |
| 1003 | void |
| 1004 | add_local_relative(Sized_relobj<size, big_endian>* relobj, |
| 1005 | unsigned int local_sym_index, unsigned int type, |
| 1006 | Output_data* od, unsigned int shndx, Address address) |
| 1007 | { this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx, |
| 1008 | address, true)); } |
| 1009 | |
| 1010 | // A reloc against the STT_SECTION symbol of an output section. |
| 1011 | // OS is the Output_section that the relocation refers to; OD is |
| 1012 | // the Output_data object being relocated. |
| 1013 | |
| 1014 | void |
| 1015 | add_output_section(Output_section* os, unsigned int type, |
| 1016 | Output_data* od, Address address) |
| 1017 | { this->add(od, Output_reloc_type(os, type, od, address)); } |
| 1018 | |
| 1019 | void |
| 1020 | add_output_section(Output_section* os, unsigned int type, Output_data* od, |
| 1021 | Relobj* relobj, unsigned int shndx, Address address) |
| 1022 | { this->add(od, Output_reloc_type(os, type, relobj, shndx, address)); } |
| 1023 | }; |
| 1024 | |
| 1025 | // The SHT_RELA version of Output_data_reloc. |
| 1026 | |
| 1027 | template<bool dynamic, int size, bool big_endian> |
| 1028 | class Output_data_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian> |
| 1029 | : public Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian> |
| 1030 | { |
| 1031 | private: |
| 1032 | typedef Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, |
| 1033 | big_endian> Base; |
| 1034 | |
| 1035 | public: |
| 1036 | typedef typename Base::Output_reloc_type Output_reloc_type; |
| 1037 | typedef typename Output_reloc_type::Address Address; |
| 1038 | typedef typename Output_reloc_type::Addend Addend; |
| 1039 | |
| 1040 | Output_data_reloc() |
| 1041 | : Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian>() |
| 1042 | { } |
| 1043 | |
| 1044 | // Add a reloc against a global symbol. |
| 1045 | |
| 1046 | void |
| 1047 | add_global(Symbol* gsym, unsigned int type, Output_data* od, |
| 1048 | Address address, Addend addend) |
| 1049 | { this->add(od, Output_reloc_type(gsym, type, od, address, addend, |
| 1050 | false)); } |
| 1051 | |
| 1052 | void |
| 1053 | add_global(Symbol* gsym, unsigned int type, Output_data* od, Relobj* relobj, |
| 1054 | unsigned int shndx, Address address, |
| 1055 | Addend addend) |
| 1056 | { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address, |
| 1057 | addend, false)); } |
| 1058 | |
| 1059 | // Add a RELATIVE reloc against a global symbol. The final output |
| 1060 | // relocation will not reference the symbol, but we must keep the symbol |
| 1061 | // information long enough to set the addend of the relocation correctly |
| 1062 | // when it is written. |
| 1063 | |
| 1064 | void |
| 1065 | add_global_relative(Symbol* gsym, unsigned int type, Output_data* od, |
| 1066 | Address address, Addend addend) |
| 1067 | { this->add(od, Output_reloc_type(gsym, type, od, address, addend, true)); } |
| 1068 | |
| 1069 | void |
| 1070 | add_global_relative(Symbol* gsym, unsigned int type, Output_data* od, |
| 1071 | Relobj* relobj, unsigned int shndx, Address address, |
| 1072 | Addend addend) |
| 1073 | { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address, |
| 1074 | addend, true)); } |
| 1075 | |
| 1076 | // Add a reloc against a local symbol. |
| 1077 | |
| 1078 | void |
| 1079 | add_local(Sized_relobj<size, big_endian>* relobj, |
| 1080 | unsigned int local_sym_index, unsigned int type, |
| 1081 | Output_data* od, Address address, Addend addend) |
| 1082 | { |
| 1083 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address, |
| 1084 | addend, false)); |
| 1085 | } |
| 1086 | |
| 1087 | void |
| 1088 | add_local(Sized_relobj<size, big_endian>* relobj, |
| 1089 | unsigned int local_sym_index, unsigned int type, |
| 1090 | Output_data* od, unsigned int shndx, Address address, |
| 1091 | Addend addend) |
| 1092 | { |
| 1093 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx, |
| 1094 | address, addend, false)); |
| 1095 | } |
| 1096 | |
| 1097 | // Add a RELATIVE reloc against a local symbol. |
| 1098 | |
| 1099 | void |
| 1100 | add_local_relative(Sized_relobj<size, big_endian>* relobj, |
| 1101 | unsigned int local_sym_index, unsigned int type, |
| 1102 | Output_data* od, Address address, Addend addend) |
| 1103 | { |
| 1104 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address, |
| 1105 | addend, true)); |
| 1106 | } |
| 1107 | |
| 1108 | void |
| 1109 | add_local_relative(Sized_relobj<size, big_endian>* relobj, |
| 1110 | unsigned int local_sym_index, unsigned int type, |
| 1111 | Output_data* od, unsigned int shndx, Address address, |
| 1112 | Addend addend) |
| 1113 | { |
| 1114 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx, |
| 1115 | address, addend, true)); |
| 1116 | } |
| 1117 | |
| 1118 | // A reloc against the STT_SECTION symbol of an output section. |
| 1119 | |
| 1120 | void |
| 1121 | add_output_section(Output_section* os, unsigned int type, Output_data* od, |
| 1122 | Address address, Addend addend) |
| 1123 | { this->add(os, Output_reloc_type(os, type, od, address, addend)); } |
| 1124 | |
| 1125 | void |
| 1126 | add_output_section(Output_section* os, unsigned int type, Relobj* relobj, |
| 1127 | unsigned int shndx, Address address, Addend addend) |
| 1128 | { this->add(os, Output_reloc_type(os, type, relobj, shndx, address, |
| 1129 | addend)); } |
| 1130 | }; |
| 1131 | |
| 1132 | // Output_data_got is used to manage a GOT. Each entry in the GOT is |
| 1133 | // for one symbol--either a global symbol or a local symbol in an |
| 1134 | // object. The target specific code adds entries to the GOT as |
| 1135 | // needed. |
| 1136 | |
| 1137 | template<int size, bool big_endian> |
| 1138 | class Output_data_got : public Output_section_data_build |
| 1139 | { |
| 1140 | public: |
| 1141 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype; |
| 1142 | typedef Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian> Rel_dyn; |
| 1143 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Rela_dyn; |
| 1144 | |
| 1145 | Output_data_got() |
| 1146 | : Output_section_data_build(Output_data::default_alignment_for_size(size)), |
| 1147 | entries_() |
| 1148 | { } |
| 1149 | |
| 1150 | // Add an entry for a global symbol to the GOT. Return true if this |
| 1151 | // is a new GOT entry, false if the symbol was already in the GOT. |
| 1152 | bool |
| 1153 | add_global(Symbol* gsym); |
| 1154 | |
| 1155 | // Add an entry for a global symbol to the GOT, and add a dynamic |
| 1156 | // relocation of type R_TYPE for the GOT entry. |
| 1157 | void |
| 1158 | add_global_with_rel(Symbol* gsym, Rel_dyn* rel_dyn, unsigned int r_type); |
| 1159 | |
| 1160 | void |
| 1161 | add_global_with_rela(Symbol* gsym, Rela_dyn* rela_dyn, unsigned int r_type); |
| 1162 | |
| 1163 | // Add an entry for a local symbol to the GOT. This returns true if |
| 1164 | // this is a new GOT entry, false if the symbol already has a GOT |
| 1165 | // entry. |
| 1166 | bool |
| 1167 | add_local(Sized_relobj<size, big_endian>* object, unsigned int sym_index); |
| 1168 | |
| 1169 | // Add an entry for a global symbol to the GOT, and add a dynamic |
| 1170 | // relocation of type R_TYPE for the GOT entry. |
| 1171 | void |
| 1172 | add_local_with_rel(Sized_relobj<size, big_endian>* object, |
| 1173 | unsigned int sym_index, Rel_dyn* rel_dyn, |
| 1174 | unsigned int r_type); |
| 1175 | |
| 1176 | void |
| 1177 | add_local_with_rela(Sized_relobj<size, big_endian>* object, |
| 1178 | unsigned int sym_index, Rela_dyn* rela_dyn, |
| 1179 | unsigned int r_type); |
| 1180 | |
| 1181 | // Add an entry (or pair of entries) for a global TLS symbol to the GOT. |
| 1182 | // Return true if this is a new GOT entry, false if the symbol was |
| 1183 | // already in the GOT. |
| 1184 | bool |
| 1185 | add_global_tls(Symbol* gsym, bool need_pair); |
| 1186 | |
| 1187 | // Add an entry for a global TLS symbol to the GOT, and add a dynamic |
| 1188 | // relocation of type R_TYPE. |
| 1189 | void |
| 1190 | add_global_tls_with_rel(Symbol* gsym, Rel_dyn* rel_dyn, |
| 1191 | unsigned int r_type); |
| 1192 | |
| 1193 | void |
| 1194 | add_global_tls_with_rela(Symbol* gsym, Rela_dyn* rela_dyn, |
| 1195 | unsigned int r_type); |
| 1196 | |
| 1197 | // Add a pair of entries for a global TLS symbol to the GOT, and add |
| 1198 | // dynamic relocations of type MOD_R_TYPE and DTV_R_TYPE, respectively. |
| 1199 | void |
| 1200 | add_global_tls_with_rel(Symbol* gsym, Rel_dyn* rel_dyn, |
| 1201 | unsigned int mod_r_type, |
| 1202 | unsigned int dtv_r_type); |
| 1203 | |
| 1204 | void |
| 1205 | add_global_tls_with_rela(Symbol* gsym, Rela_dyn* rela_dyn, |
| 1206 | unsigned int mod_r_type, |
| 1207 | unsigned int dtv_r_type); |
| 1208 | |
| 1209 | // Add an entry (or pair of entries) for a local TLS symbol to the GOT. |
| 1210 | // This returns true if this is a new GOT entry, false if the symbol |
| 1211 | // already has a GOT entry. |
| 1212 | bool |
| 1213 | add_local_tls(Sized_relobj<size, big_endian>* object, |
| 1214 | unsigned int sym_index, bool need_pair); |
| 1215 | |
| 1216 | // Add an entry (or pair of entries) for a local TLS symbol to the GOT, |
| 1217 | // and add a dynamic relocation of type R_TYPE for the first GOT entry. |
| 1218 | // Because this is a local symbol, the first GOT entry can be relocated |
| 1219 | // relative to a section symbol, and the second GOT entry will have an |
| 1220 | // dtv-relative value that can be computed at link time. |
| 1221 | void |
| 1222 | add_local_tls_with_rel(Sized_relobj<size, big_endian>* object, |
| 1223 | unsigned int sym_index, unsigned int shndx, |
| 1224 | bool need_pair, Rel_dyn* rel_dyn, |
| 1225 | unsigned int r_type); |
| 1226 | |
| 1227 | void |
| 1228 | add_local_tls_with_rela(Sized_relobj<size, big_endian>* object, |
| 1229 | unsigned int sym_index, unsigned int shndx, |
| 1230 | bool need_pair, Rela_dyn* rela_dyn, |
| 1231 | unsigned int r_type); |
| 1232 | |
| 1233 | // Add a constant to the GOT. This returns the offset of the new |
| 1234 | // entry from the start of the GOT. |
| 1235 | unsigned int |
| 1236 | add_constant(Valtype constant) |
| 1237 | { |
| 1238 | this->entries_.push_back(Got_entry(constant)); |
| 1239 | this->set_got_size(); |
| 1240 | return this->last_got_offset(); |
| 1241 | } |
| 1242 | |
| 1243 | protected: |
| 1244 | // Write out the GOT table. |
| 1245 | void |
| 1246 | do_write(Output_file*); |
| 1247 | |
| 1248 | private: |
| 1249 | // This POD class holds a single GOT entry. |
| 1250 | class Got_entry |
| 1251 | { |
| 1252 | public: |
| 1253 | // Create a zero entry. |
| 1254 | Got_entry() |
| 1255 | : local_sym_index_(CONSTANT_CODE) |
| 1256 | { this->u_.constant = 0; } |
| 1257 | |
| 1258 | // Create a global symbol entry. |
| 1259 | explicit Got_entry(Symbol* gsym) |
| 1260 | : local_sym_index_(GSYM_CODE) |
| 1261 | { this->u_.gsym = gsym; } |
| 1262 | |
| 1263 | // Create a local symbol entry. |
| 1264 | Got_entry(Sized_relobj<size, big_endian>* object, |
| 1265 | unsigned int local_sym_index) |
| 1266 | : local_sym_index_(local_sym_index) |
| 1267 | { |
| 1268 | gold_assert(local_sym_index != GSYM_CODE |
| 1269 | && local_sym_index != CONSTANT_CODE); |
| 1270 | this->u_.object = object; |
| 1271 | } |
| 1272 | |
| 1273 | // Create a constant entry. The constant is a host value--it will |
| 1274 | // be swapped, if necessary, when it is written out. |
| 1275 | explicit Got_entry(Valtype constant) |
| 1276 | : local_sym_index_(CONSTANT_CODE) |
| 1277 | { this->u_.constant = constant; } |
| 1278 | |
| 1279 | // Write the GOT entry to an output view. |
| 1280 | void |
| 1281 | write(unsigned char* pov) const; |
| 1282 | |
| 1283 | private: |
| 1284 | enum |
| 1285 | { |
| 1286 | GSYM_CODE = -1U, |
| 1287 | CONSTANT_CODE = -2U |
| 1288 | }; |
| 1289 | |
| 1290 | union |
| 1291 | { |
| 1292 | // For a local symbol, the object. |
| 1293 | Sized_relobj<size, big_endian>* object; |
| 1294 | // For a global symbol, the symbol. |
| 1295 | Symbol* gsym; |
| 1296 | // For a constant, the constant. |
| 1297 | Valtype constant; |
| 1298 | } u_; |
| 1299 | // For a local symbol, the local symbol index. This is GSYM_CODE |
| 1300 | // for a global symbol, or CONSTANT_CODE for a constant. |
| 1301 | unsigned int local_sym_index_; |
| 1302 | }; |
| 1303 | |
| 1304 | typedef std::vector<Got_entry> Got_entries; |
| 1305 | |
| 1306 | // Return the offset into the GOT of GOT entry I. |
| 1307 | unsigned int |
| 1308 | got_offset(unsigned int i) const |
| 1309 | { return i * (size / 8); } |
| 1310 | |
| 1311 | // Return the offset into the GOT of the last entry added. |
| 1312 | unsigned int |
| 1313 | last_got_offset() const |
| 1314 | { return this->got_offset(this->entries_.size() - 1); } |
| 1315 | |
| 1316 | // Set the size of the section. |
| 1317 | void |
| 1318 | set_got_size() |
| 1319 | { this->set_current_data_size(this->got_offset(this->entries_.size())); } |
| 1320 | |
| 1321 | // The list of GOT entries. |
| 1322 | Got_entries entries_; |
| 1323 | }; |
| 1324 | |
| 1325 | // Output_data_dynamic is used to hold the data in SHT_DYNAMIC |
| 1326 | // section. |
| 1327 | |
| 1328 | class Output_data_dynamic : public Output_section_data |
| 1329 | { |
| 1330 | public: |
| 1331 | Output_data_dynamic(Stringpool* pool) |
| 1332 | : Output_section_data(Output_data::default_alignment()), |
| 1333 | entries_(), pool_(pool) |
| 1334 | { } |
| 1335 | |
| 1336 | // Add a new dynamic entry with a fixed numeric value. |
| 1337 | void |
| 1338 | add_constant(elfcpp::DT tag, unsigned int val) |
| 1339 | { this->add_entry(Dynamic_entry(tag, val)); } |
| 1340 | |
| 1341 | // Add a new dynamic entry with the address of output data. |
| 1342 | void |
| 1343 | add_section_address(elfcpp::DT tag, const Output_data* od) |
| 1344 | { this->add_entry(Dynamic_entry(tag, od, false)); } |
| 1345 | |
| 1346 | // Add a new dynamic entry with the size of output data. |
| 1347 | void |
| 1348 | add_section_size(elfcpp::DT tag, const Output_data* od) |
| 1349 | { this->add_entry(Dynamic_entry(tag, od, true)); } |
| 1350 | |
| 1351 | // Add a new dynamic entry with the address of a symbol. |
| 1352 | void |
| 1353 | add_symbol(elfcpp::DT tag, const Symbol* sym) |
| 1354 | { this->add_entry(Dynamic_entry(tag, sym)); } |
| 1355 | |
| 1356 | // Add a new dynamic entry with a string. |
| 1357 | void |
| 1358 | add_string(elfcpp::DT tag, const char* str) |
| 1359 | { this->add_entry(Dynamic_entry(tag, this->pool_->add(str, true, NULL))); } |
| 1360 | |
| 1361 | void |
| 1362 | add_string(elfcpp::DT tag, const std::string& str) |
| 1363 | { this->add_string(tag, str.c_str()); } |
| 1364 | |
| 1365 | protected: |
| 1366 | // Adjust the output section to set the entry size. |
| 1367 | void |
| 1368 | do_adjust_output_section(Output_section*); |
| 1369 | |
| 1370 | // Set the final data size. |
| 1371 | void |
| 1372 | set_final_data_size(); |
| 1373 | |
| 1374 | // Write out the dynamic entries. |
| 1375 | void |
| 1376 | do_write(Output_file*); |
| 1377 | |
| 1378 | private: |
| 1379 | // This POD class holds a single dynamic entry. |
| 1380 | class Dynamic_entry |
| 1381 | { |
| 1382 | public: |
| 1383 | // Create an entry with a fixed numeric value. |
| 1384 | Dynamic_entry(elfcpp::DT tag, unsigned int val) |
| 1385 | : tag_(tag), classification_(DYNAMIC_NUMBER) |
| 1386 | { this->u_.val = val; } |
| 1387 | |
| 1388 | // Create an entry with the size or address of a section. |
| 1389 | Dynamic_entry(elfcpp::DT tag, const Output_data* od, bool section_size) |
| 1390 | : tag_(tag), |
| 1391 | classification_(section_size |
| 1392 | ? DYNAMIC_SECTION_SIZE |
| 1393 | : DYNAMIC_SECTION_ADDRESS) |
| 1394 | { this->u_.od = od; } |
| 1395 | |
| 1396 | // Create an entry with the address of a symbol. |
| 1397 | Dynamic_entry(elfcpp::DT tag, const Symbol* sym) |
| 1398 | : tag_(tag), classification_(DYNAMIC_SYMBOL) |
| 1399 | { this->u_.sym = sym; } |
| 1400 | |
| 1401 | // Create an entry with a string. |
| 1402 | Dynamic_entry(elfcpp::DT tag, const char* str) |
| 1403 | : tag_(tag), classification_(DYNAMIC_STRING) |
| 1404 | { this->u_.str = str; } |
| 1405 | |
| 1406 | // Write the dynamic entry to an output view. |
| 1407 | template<int size, bool big_endian> |
| 1408 | void |
| 1409 | write(unsigned char* pov, const Stringpool* ACCEPT_SIZE_ENDIAN) const; |
| 1410 | |
| 1411 | private: |
| 1412 | enum Classification |
| 1413 | { |
| 1414 | // Number. |
| 1415 | DYNAMIC_NUMBER, |
| 1416 | // Section address. |
| 1417 | DYNAMIC_SECTION_ADDRESS, |
| 1418 | // Section size. |
| 1419 | DYNAMIC_SECTION_SIZE, |
| 1420 | // Symbol adress. |
| 1421 | DYNAMIC_SYMBOL, |
| 1422 | // String. |
| 1423 | DYNAMIC_STRING |
| 1424 | }; |
| 1425 | |
| 1426 | union |
| 1427 | { |
| 1428 | // For DYNAMIC_NUMBER. |
| 1429 | unsigned int val; |
| 1430 | // For DYNAMIC_SECTION_ADDRESS and DYNAMIC_SECTION_SIZE. |
| 1431 | const Output_data* od; |
| 1432 | // For DYNAMIC_SYMBOL. |
| 1433 | const Symbol* sym; |
| 1434 | // For DYNAMIC_STRING. |
| 1435 | const char* str; |
| 1436 | } u_; |
| 1437 | // The dynamic tag. |
| 1438 | elfcpp::DT tag_; |
| 1439 | // The type of entry. |
| 1440 | Classification classification_; |
| 1441 | }; |
| 1442 | |
| 1443 | // Add an entry to the list. |
| 1444 | void |
| 1445 | add_entry(const Dynamic_entry& entry) |
| 1446 | { this->entries_.push_back(entry); } |
| 1447 | |
| 1448 | // Sized version of write function. |
| 1449 | template<int size, bool big_endian> |
| 1450 | void |
| 1451 | sized_write(Output_file* of); |
| 1452 | |
| 1453 | // The type of the list of entries. |
| 1454 | typedef std::vector<Dynamic_entry> Dynamic_entries; |
| 1455 | |
| 1456 | // The entries. |
| 1457 | Dynamic_entries entries_; |
| 1458 | // The pool used for strings. |
| 1459 | Stringpool* pool_; |
| 1460 | }; |
| 1461 | |
| 1462 | // An output section. We don't expect to have too many output |
| 1463 | // sections, so we don't bother to do a template on the size. |
| 1464 | |
| 1465 | class Output_section : public Output_data |
| 1466 | { |
| 1467 | public: |
| 1468 | // Create an output section, giving the name, type, and flags. |
| 1469 | Output_section(const char* name, elfcpp::Elf_Word, elfcpp::Elf_Xword); |
| 1470 | virtual ~Output_section(); |
| 1471 | |
| 1472 | // Add a new input section SHNDX, named NAME, with header SHDR, from |
| 1473 | // object OBJECT. RELOC_SHNDX is the index of a relocation section |
| 1474 | // which applies to this section, or 0 if none, or -1U if more than |
| 1475 | // one. Return the offset within the output section. |
| 1476 | template<int size, bool big_endian> |
| 1477 | off_t |
| 1478 | add_input_section(Sized_relobj<size, big_endian>* object, unsigned int shndx, |
| 1479 | const char *name, |
| 1480 | const elfcpp::Shdr<size, big_endian>& shdr, |
| 1481 | unsigned int reloc_shndx); |
| 1482 | |
| 1483 | // Add generated data POSD to this output section. |
| 1484 | void |
| 1485 | add_output_section_data(Output_section_data* posd); |
| 1486 | |
| 1487 | // Return the section name. |
| 1488 | const char* |
| 1489 | name() const |
| 1490 | { return this->name_; } |
| 1491 | |
| 1492 | // Return the section type. |
| 1493 | elfcpp::Elf_Word |
| 1494 | type() const |
| 1495 | { return this->type_; } |
| 1496 | |
| 1497 | // Return the section flags. |
| 1498 | elfcpp::Elf_Xword |
| 1499 | flags() const |
| 1500 | { return this->flags_; } |
| 1501 | |
| 1502 | // Return the entsize field. |
| 1503 | uint64_t |
| 1504 | entsize() const |
| 1505 | { return this->entsize_; } |
| 1506 | |
| 1507 | // Set the entsize field. |
| 1508 | void |
| 1509 | set_entsize(uint64_t v); |
| 1510 | |
| 1511 | // Set the link field to the output section index of a section. |
| 1512 | void |
| 1513 | set_link_section(const Output_data* od) |
| 1514 | { |
| 1515 | gold_assert(this->link_ == 0 |
| 1516 | && !this->should_link_to_symtab_ |
| 1517 | && !this->should_link_to_dynsym_); |
| 1518 | this->link_section_ = od; |
| 1519 | } |
| 1520 | |
| 1521 | // Set the link field to a constant. |
| 1522 | void |
| 1523 | set_link(unsigned int v) |
| 1524 | { |
| 1525 | gold_assert(this->link_section_ == NULL |
| 1526 | && !this->should_link_to_symtab_ |
| 1527 | && !this->should_link_to_dynsym_); |
| 1528 | this->link_ = v; |
| 1529 | } |
| 1530 | |
| 1531 | // Record that this section should link to the normal symbol table. |
| 1532 | void |
| 1533 | set_should_link_to_symtab() |
| 1534 | { |
| 1535 | gold_assert(this->link_section_ == NULL |
| 1536 | && this->link_ == 0 |
| 1537 | && !this->should_link_to_dynsym_); |
| 1538 | this->should_link_to_symtab_ = true; |
| 1539 | } |
| 1540 | |
| 1541 | // Record that this section should link to the dynamic symbol table. |
| 1542 | void |
| 1543 | set_should_link_to_dynsym() |
| 1544 | { |
| 1545 | gold_assert(this->link_section_ == NULL |
| 1546 | && this->link_ == 0 |
| 1547 | && !this->should_link_to_symtab_); |
| 1548 | this->should_link_to_dynsym_ = true; |
| 1549 | } |
| 1550 | |
| 1551 | // Return the info field. |
| 1552 | unsigned int |
| 1553 | info() const |
| 1554 | { |
| 1555 | gold_assert(this->info_section_ == NULL); |
| 1556 | return this->info_; |
| 1557 | } |
| 1558 | |
| 1559 | // Set the info field to the output section index of a section. |
| 1560 | void |
| 1561 | set_info_section(const Output_data* od) |
| 1562 | { |
| 1563 | gold_assert(this->info_ == 0); |
| 1564 | this->info_section_ = od; |
| 1565 | } |
| 1566 | |
| 1567 | // Set the info field to a constant. |
| 1568 | void |
| 1569 | set_info(unsigned int v) |
| 1570 | { |
| 1571 | gold_assert(this->info_section_ == NULL); |
| 1572 | this->info_ = v; |
| 1573 | } |
| 1574 | |
| 1575 | // Set the addralign field. |
| 1576 | void |
| 1577 | set_addralign(uint64_t v) |
| 1578 | { this->addralign_ = v; } |
| 1579 | |
| 1580 | // Indicate that we need a symtab index. |
| 1581 | void |
| 1582 | set_needs_symtab_index() |
| 1583 | { this->needs_symtab_index_ = true; } |
| 1584 | |
| 1585 | // Return whether we need a symtab index. |
| 1586 | bool |
| 1587 | needs_symtab_index() const |
| 1588 | { return this->needs_symtab_index_; } |
| 1589 | |
| 1590 | // Get the symtab index. |
| 1591 | unsigned int |
| 1592 | symtab_index() const |
| 1593 | { |
| 1594 | gold_assert(this->symtab_index_ != 0); |
| 1595 | return this->symtab_index_; |
| 1596 | } |
| 1597 | |
| 1598 | // Set the symtab index. |
| 1599 | void |
| 1600 | set_symtab_index(unsigned int index) |
| 1601 | { |
| 1602 | gold_assert(index != 0); |
| 1603 | this->symtab_index_ = index; |
| 1604 | } |
| 1605 | |
| 1606 | // Indicate that we need a dynsym index. |
| 1607 | void |
| 1608 | set_needs_dynsym_index() |
| 1609 | { this->needs_dynsym_index_ = true; } |
| 1610 | |
| 1611 | // Return whether we need a dynsym index. |
| 1612 | bool |
| 1613 | needs_dynsym_index() const |
| 1614 | { return this->needs_dynsym_index_; } |
| 1615 | |
| 1616 | // Get the dynsym index. |
| 1617 | unsigned int |
| 1618 | dynsym_index() const |
| 1619 | { |
| 1620 | gold_assert(this->dynsym_index_ != 0); |
| 1621 | return this->dynsym_index_; |
| 1622 | } |
| 1623 | |
| 1624 | // Set the dynsym index. |
| 1625 | void |
| 1626 | set_dynsym_index(unsigned int index) |
| 1627 | { |
| 1628 | gold_assert(index != 0); |
| 1629 | this->dynsym_index_ = index; |
| 1630 | } |
| 1631 | |
| 1632 | // Return whether this section should be written after all the input |
| 1633 | // sections are complete. |
| 1634 | bool |
| 1635 | after_input_sections() const |
| 1636 | { return this->after_input_sections_; } |
| 1637 | |
| 1638 | // Record that this section should be written after all the input |
| 1639 | // sections are complete. |
| 1640 | void |
| 1641 | set_after_input_sections() |
| 1642 | { this->after_input_sections_ = true; } |
| 1643 | |
| 1644 | // Return whether this section requires postprocessing after all |
| 1645 | // relocations have been applied. |
| 1646 | bool |
| 1647 | requires_postprocessing() const |
| 1648 | { return this->requires_postprocessing_; } |
| 1649 | |
| 1650 | // If a section requires postprocessing, return the buffer to use. |
| 1651 | unsigned char* |
| 1652 | postprocessing_buffer() const |
| 1653 | { |
| 1654 | gold_assert(this->postprocessing_buffer_ != NULL); |
| 1655 | return this->postprocessing_buffer_; |
| 1656 | } |
| 1657 | |
| 1658 | // If a section requires postprocessing, create the buffer to use. |
| 1659 | void |
| 1660 | create_postprocessing_buffer(); |
| 1661 | |
| 1662 | // If a section requires postprocessing, this is the size of the |
| 1663 | // buffer to which relocations should be applied. |
| 1664 | off_t |
| 1665 | postprocessing_buffer_size() const |
| 1666 | { return this->current_data_size_for_child(); } |
| 1667 | |
| 1668 | // Return whether the offset OFFSET in the input section SHNDX in |
| 1669 | // object OBJECT is being included in the link. |
| 1670 | bool |
| 1671 | is_input_address_mapped(const Relobj* object, unsigned int shndx, |
| 1672 | off_t offset) const; |
| 1673 | |
| 1674 | // Return the offset within the output section of OFFSET relative to |
| 1675 | // the start of input section SHNDX in object OBJECT. |
| 1676 | section_offset_type |
| 1677 | output_offset(const Relobj* object, unsigned int shndx, |
| 1678 | section_offset_type offset) const; |
| 1679 | |
| 1680 | // Return the output virtual address of OFFSET relative to the start |
| 1681 | // of input section SHNDX in object OBJECT. |
| 1682 | uint64_t |
| 1683 | output_address(const Relobj* object, unsigned int shndx, |
| 1684 | off_t offset) const; |
| 1685 | |
| 1686 | // Write the section header into *OPHDR. |
| 1687 | template<int size, bool big_endian> |
| 1688 | void |
| 1689 | write_header(const Layout*, const Stringpool*, |
| 1690 | elfcpp::Shdr_write<size, big_endian>*) const; |
| 1691 | |
| 1692 | // Print merge statistics to stderr. |
| 1693 | void |
| 1694 | print_merge_stats(); |
| 1695 | |
| 1696 | protected: |
| 1697 | // Return the section index in the output file. |
| 1698 | unsigned int |
| 1699 | do_out_shndx() const |
| 1700 | { |
| 1701 | gold_assert(this->out_shndx_ != -1U); |
| 1702 | return this->out_shndx_; |
| 1703 | } |
| 1704 | |
| 1705 | // Set the output section index. |
| 1706 | void |
| 1707 | do_set_out_shndx(unsigned int shndx) |
| 1708 | { |
| 1709 | gold_assert(this->out_shndx_ == -1U); |
| 1710 | this->out_shndx_ = shndx; |
| 1711 | } |
| 1712 | |
| 1713 | // Set the final data size of the Output_section. For a typical |
| 1714 | // Output_section, there is nothing to do, but if there are any |
| 1715 | // Output_section_data objects we need to set their final addresses |
| 1716 | // here. |
| 1717 | virtual void |
| 1718 | set_final_data_size(); |
| 1719 | |
| 1720 | // Write the data to the file. For a typical Output_section, this |
| 1721 | // does nothing: the data is written out by calling Object::Relocate |
| 1722 | // on each input object. But if there are any Output_section_data |
| 1723 | // objects we do need to write them out here. |
| 1724 | virtual void |
| 1725 | do_write(Output_file*); |
| 1726 | |
| 1727 | // Return the address alignment--function required by parent class. |
| 1728 | uint64_t |
| 1729 | do_addralign() const |
| 1730 | { return this->addralign_; } |
| 1731 | |
| 1732 | // Return whether this is an Output_section. |
| 1733 | bool |
| 1734 | do_is_section() const |
| 1735 | { return true; } |
| 1736 | |
| 1737 | // Return whether this is a section of the specified type. |
| 1738 | bool |
| 1739 | do_is_section_type(elfcpp::Elf_Word type) const |
| 1740 | { return this->type_ == type; } |
| 1741 | |
| 1742 | // Return whether the specified section flag is set. |
| 1743 | bool |
| 1744 | do_is_section_flag_set(elfcpp::Elf_Xword flag) const |
| 1745 | { return (this->flags_ & flag) != 0; } |
| 1746 | |
| 1747 | // Set the TLS offset. Called only for SHT_TLS sections. |
| 1748 | void |
| 1749 | do_set_tls_offset(uint64_t tls_base); |
| 1750 | |
| 1751 | // Return the TLS offset, relative to the base of the TLS segment. |
| 1752 | // Valid only for SHT_TLS sections. |
| 1753 | uint64_t |
| 1754 | do_tls_offset() const |
| 1755 | { return this->tls_offset_; } |
| 1756 | |
| 1757 | // Modify the section name. This is only permitted for an |
| 1758 | // unallocated section, and only before the size has been finalized. |
| 1759 | // Otherwise the name will not get into Layout::namepool_. |
| 1760 | void |
| 1761 | set_name(const char* newname) |
| 1762 | { |
| 1763 | gold_assert((this->flags_ & elfcpp::SHF_ALLOC) == 0); |
| 1764 | gold_assert(!this->is_data_size_valid()); |
| 1765 | this->name_ = newname; |
| 1766 | } |
| 1767 | |
| 1768 | // This may be implemented by a child class. |
| 1769 | virtual void |
| 1770 | do_finalize_name(Layout*) |
| 1771 | { } |
| 1772 | |
| 1773 | // Record that this section requires postprocessing after all |
| 1774 | // relocations have been applied. This is called by a child class. |
| 1775 | void |
| 1776 | set_requires_postprocessing() |
| 1777 | { |
| 1778 | this->requires_postprocessing_ = true; |
| 1779 | this->after_input_sections_ = true; |
| 1780 | } |
| 1781 | |
| 1782 | // Write all the data of an Output_section into the postprocessing |
| 1783 | // buffer. |
| 1784 | void |
| 1785 | write_to_postprocessing_buffer(); |
| 1786 | |
| 1787 | private: |
| 1788 | // In some cases we need to keep a list of the input sections |
| 1789 | // associated with this output section. We only need the list if we |
| 1790 | // might have to change the offsets of the input section within the |
| 1791 | // output section after we add the input section. The ordinary |
| 1792 | // input sections will be written out when we process the object |
| 1793 | // file, and as such we don't need to track them here. We do need |
| 1794 | // to track Output_section_data objects here. We store instances of |
| 1795 | // this structure in a std::vector, so it must be a POD. There can |
| 1796 | // be many instances of this structure, so we use a union to save |
| 1797 | // some space. |
| 1798 | class Input_section |
| 1799 | { |
| 1800 | public: |
| 1801 | Input_section() |
| 1802 | : shndx_(0), p2align_(0) |
| 1803 | { |
| 1804 | this->u1_.data_size = 0; |
| 1805 | this->u2_.object = NULL; |
| 1806 | } |
| 1807 | |
| 1808 | // For an ordinary input section. |
| 1809 | Input_section(Relobj* object, unsigned int shndx, off_t data_size, |
| 1810 | uint64_t addralign) |
| 1811 | : shndx_(shndx), |
| 1812 | p2align_(ffsll(static_cast<long long>(addralign))) |
| 1813 | { |
| 1814 | gold_assert(shndx != OUTPUT_SECTION_CODE |
| 1815 | && shndx != MERGE_DATA_SECTION_CODE |
| 1816 | && shndx != MERGE_STRING_SECTION_CODE); |
| 1817 | this->u1_.data_size = data_size; |
| 1818 | this->u2_.object = object; |
| 1819 | } |
| 1820 | |
| 1821 | // For a non-merge output section. |
| 1822 | Input_section(Output_section_data* posd) |
| 1823 | : shndx_(OUTPUT_SECTION_CODE), |
| 1824 | p2align_(ffsll(static_cast<long long>(posd->addralign()))) |
| 1825 | { |
| 1826 | this->u1_.data_size = 0; |
| 1827 | this->u2_.posd = posd; |
| 1828 | } |
| 1829 | |
| 1830 | // For a merge section. |
| 1831 | Input_section(Output_section_data* posd, bool is_string, uint64_t entsize) |
| 1832 | : shndx_(is_string |
| 1833 | ? MERGE_STRING_SECTION_CODE |
| 1834 | : MERGE_DATA_SECTION_CODE), |
| 1835 | p2align_(ffsll(static_cast<long long>(posd->addralign()))) |
| 1836 | { |
| 1837 | this->u1_.entsize = entsize; |
| 1838 | this->u2_.posd = posd; |
| 1839 | } |
| 1840 | |
| 1841 | // The required alignment. |
| 1842 | uint64_t |
| 1843 | addralign() const |
| 1844 | { |
| 1845 | return (this->p2align_ == 0 |
| 1846 | ? 0 |
| 1847 | : static_cast<uint64_t>(1) << (this->p2align_ - 1)); |
| 1848 | } |
| 1849 | |
| 1850 | // Return the required size. |
| 1851 | off_t |
| 1852 | data_size() const; |
| 1853 | |
| 1854 | // Return whether this is a merge section which matches the |
| 1855 | // parameters. |
| 1856 | bool |
| 1857 | is_merge_section(bool is_string, uint64_t entsize, |
| 1858 | uint64_t addralign) const |
| 1859 | { |
| 1860 | return (this->shndx_ == (is_string |
| 1861 | ? MERGE_STRING_SECTION_CODE |
| 1862 | : MERGE_DATA_SECTION_CODE) |
| 1863 | && this->u1_.entsize == entsize |
| 1864 | && this->addralign() == addralign); |
| 1865 | } |
| 1866 | |
| 1867 | // Set the output section. |
| 1868 | void |
| 1869 | set_output_section(Output_section* os) |
| 1870 | { |
| 1871 | gold_assert(!this->is_input_section()); |
| 1872 | this->u2_.posd->set_output_section(os); |
| 1873 | } |
| 1874 | |
| 1875 | // Set the address and file offset. This is called during |
| 1876 | // Layout::finalize. SECTION_FILE_OFFSET is the file offset of |
| 1877 | // the enclosing section. |
| 1878 | void |
| 1879 | set_address_and_file_offset(uint64_t address, off_t file_offset, |
| 1880 | off_t section_file_offset); |
| 1881 | |
| 1882 | // Finalize the data size. |
| 1883 | void |
| 1884 | finalize_data_size(); |
| 1885 | |
| 1886 | // Add an input section, for SHF_MERGE sections. |
| 1887 | bool |
| 1888 | add_input_section(Relobj* object, unsigned int shndx) |
| 1889 | { |
| 1890 | gold_assert(this->shndx_ == MERGE_DATA_SECTION_CODE |
| 1891 | || this->shndx_ == MERGE_STRING_SECTION_CODE); |
| 1892 | return this->u2_.posd->add_input_section(object, shndx); |
| 1893 | } |
| 1894 | |
| 1895 | // Given an input OBJECT, an input section index SHNDX within that |
| 1896 | // object, and an OFFSET relative to the start of that input |
| 1897 | // section, return whether or not the output offset is known. If |
| 1898 | // this function returns true, it sets *POUTPUT to the offset in |
| 1899 | // the output section, relative to the start of the input section |
| 1900 | // in the output section. *POUTPUT may be different from OFFSET |
| 1901 | // for a merged section. |
| 1902 | bool |
| 1903 | output_offset(const Relobj* object, unsigned int shndx, |
| 1904 | section_offset_type offset, |
| 1905 | section_offset_type *poutput) const; |
| 1906 | |
| 1907 | // Write out the data. This does nothing for an input section. |
| 1908 | void |
| 1909 | write(Output_file*); |
| 1910 | |
| 1911 | // Write the data to a buffer. This does nothing for an input |
| 1912 | // section. |
| 1913 | void |
| 1914 | write_to_buffer(unsigned char*); |
| 1915 | |
| 1916 | // Print statistics about merge sections to stderr. |
| 1917 | void |
| 1918 | print_merge_stats(const char* section_name) |
| 1919 | { |
| 1920 | if (this->shndx_ == MERGE_DATA_SECTION_CODE |
| 1921 | || this->shndx_ == MERGE_STRING_SECTION_CODE) |
| 1922 | this->u2_.posd->print_merge_stats(section_name); |
| 1923 | } |
| 1924 | |
| 1925 | private: |
| 1926 | // Code values which appear in shndx_. If the value is not one of |
| 1927 | // these codes, it is the input section index in the object file. |
| 1928 | enum |
| 1929 | { |
| 1930 | // An Output_section_data. |
| 1931 | OUTPUT_SECTION_CODE = -1U, |
| 1932 | // An Output_section_data for an SHF_MERGE section with |
| 1933 | // SHF_STRINGS not set. |
| 1934 | MERGE_DATA_SECTION_CODE = -2U, |
| 1935 | // An Output_section_data for an SHF_MERGE section with |
| 1936 | // SHF_STRINGS set. |
| 1937 | MERGE_STRING_SECTION_CODE = -3U |
| 1938 | }; |
| 1939 | |
| 1940 | // Whether this is an input section. |
| 1941 | bool |
| 1942 | is_input_section() const |
| 1943 | { |
| 1944 | return (this->shndx_ != OUTPUT_SECTION_CODE |
| 1945 | && this->shndx_ != MERGE_DATA_SECTION_CODE |
| 1946 | && this->shndx_ != MERGE_STRING_SECTION_CODE); |
| 1947 | } |
| 1948 | |
| 1949 | // For an ordinary input section, this is the section index in the |
| 1950 | // input file. For an Output_section_data, this is |
| 1951 | // OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or |
| 1952 | // MERGE_STRING_SECTION_CODE. |
| 1953 | unsigned int shndx_; |
| 1954 | // The required alignment, stored as a power of 2. |
| 1955 | unsigned int p2align_; |
| 1956 | union |
| 1957 | { |
| 1958 | // For an ordinary input section, the section size. |
| 1959 | off_t data_size; |
| 1960 | // For OUTPUT_SECTION_CODE, this is not used. For |
| 1961 | // MERGE_DATA_SECTION_CODE or MERGE_STRING_SECTION_CODE, the |
| 1962 | // entity size. |
| 1963 | uint64_t entsize; |
| 1964 | } u1_; |
| 1965 | union |
| 1966 | { |
| 1967 | // For an ordinary input section, the object which holds the |
| 1968 | // input section. |
| 1969 | Relobj* object; |
| 1970 | // For OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or |
| 1971 | // MERGE_STRING_SECTION_CODE, the data. |
| 1972 | Output_section_data* posd; |
| 1973 | } u2_; |
| 1974 | }; |
| 1975 | |
| 1976 | typedef std::vector<Input_section> Input_section_list; |
| 1977 | |
| 1978 | // Fill data. This is used to fill in data between input sections. |
| 1979 | // When we have to keep track of the input sections, we can use an |
| 1980 | // Output_data_const, but we don't want to have to keep track of |
| 1981 | // input sections just to implement fills. For a fill we record the |
| 1982 | // offset, and the actual data to be written out. |
| 1983 | class Fill |
| 1984 | { |
| 1985 | public: |
| 1986 | Fill(off_t section_offset, off_t length) |
| 1987 | : section_offset_(section_offset), length_(length) |
| 1988 | { } |
| 1989 | |
| 1990 | // Return section offset. |
| 1991 | off_t |
| 1992 | section_offset() const |
| 1993 | { return this->section_offset_; } |
| 1994 | |
| 1995 | // Return fill length. |
| 1996 | off_t |
| 1997 | length() const |
| 1998 | { return this->length_; } |
| 1999 | |
| 2000 | private: |
| 2001 | // The offset within the output section. |
| 2002 | off_t section_offset_; |
| 2003 | // The length of the space to fill. |
| 2004 | off_t length_; |
| 2005 | }; |
| 2006 | |
| 2007 | typedef std::vector<Fill> Fill_list; |
| 2008 | |
| 2009 | // Add a new output section by Input_section. |
| 2010 | void |
| 2011 | add_output_section_data(Input_section*); |
| 2012 | |
| 2013 | // Add an SHF_MERGE input section. Returns true if the section was |
| 2014 | // handled. |
| 2015 | bool |
| 2016 | add_merge_input_section(Relobj* object, unsigned int shndx, uint64_t flags, |
| 2017 | uint64_t entsize, uint64_t addralign); |
| 2018 | |
| 2019 | // Add an output SHF_MERGE section POSD to this output section. |
| 2020 | // IS_STRING indicates whether it is a SHF_STRINGS section, and |
| 2021 | // ENTSIZE is the entity size. This returns the entry added to |
| 2022 | // input_sections_. |
| 2023 | void |
| 2024 | add_output_merge_section(Output_section_data* posd, bool is_string, |
| 2025 | uint64_t entsize); |
| 2026 | |
| 2027 | // Most of these fields are only valid after layout. |
| 2028 | |
| 2029 | // The name of the section. This will point into a Stringpool. |
| 2030 | const char* name_; |
| 2031 | // The section address is in the parent class. |
| 2032 | // The section alignment. |
| 2033 | uint64_t addralign_; |
| 2034 | // The section entry size. |
| 2035 | uint64_t entsize_; |
| 2036 | // The file offset is in the parent class. |
| 2037 | // Set the section link field to the index of this section. |
| 2038 | const Output_data* link_section_; |
| 2039 | // If link_section_ is NULL, this is the link field. |
| 2040 | unsigned int link_; |
| 2041 | // Set the section info field to the index of this section. |
| 2042 | const Output_data* info_section_; |
| 2043 | // If info_section_ is NULL, this is the section info field. |
| 2044 | unsigned int info_; |
| 2045 | // The section type. |
| 2046 | const elfcpp::Elf_Word type_; |
| 2047 | // The section flags. |
| 2048 | const elfcpp::Elf_Xword flags_; |
| 2049 | // The section index. |
| 2050 | unsigned int out_shndx_; |
| 2051 | // If there is a STT_SECTION for this output section in the normal |
| 2052 | // symbol table, this is the symbol index. This starts out as zero. |
| 2053 | // It is initialized in Layout::finalize() to be the index, or -1U |
| 2054 | // if there isn't one. |
| 2055 | unsigned int symtab_index_; |
| 2056 | // If there is a STT_SECTION for this output section in the dynamic |
| 2057 | // symbol table, this is the symbol index. This starts out as zero. |
| 2058 | // It is initialized in Layout::finalize() to be the index, or -1U |
| 2059 | // if there isn't one. |
| 2060 | unsigned int dynsym_index_; |
| 2061 | // The input sections. This will be empty in cases where we don't |
| 2062 | // need to keep track of them. |
| 2063 | Input_section_list input_sections_; |
| 2064 | // The offset of the first entry in input_sections_. |
| 2065 | off_t first_input_offset_; |
| 2066 | // The fill data. This is separate from input_sections_ because we |
| 2067 | // often will need fill sections without needing to keep track of |
| 2068 | // input sections. |
| 2069 | Fill_list fills_; |
| 2070 | // If the section requires postprocessing, this buffer holds the |
| 2071 | // section contents during relocation. |
| 2072 | unsigned char* postprocessing_buffer_; |
| 2073 | // Whether this output section needs a STT_SECTION symbol in the |
| 2074 | // normal symbol table. This will be true if there is a relocation |
| 2075 | // which needs it. |
| 2076 | bool needs_symtab_index_ : 1; |
| 2077 | // Whether this output section needs a STT_SECTION symbol in the |
| 2078 | // dynamic symbol table. This will be true if there is a dynamic |
| 2079 | // relocation which needs it. |
| 2080 | bool needs_dynsym_index_ : 1; |
| 2081 | // Whether the link field of this output section should point to the |
| 2082 | // normal symbol table. |
| 2083 | bool should_link_to_symtab_ : 1; |
| 2084 | // Whether the link field of this output section should point to the |
| 2085 | // dynamic symbol table. |
| 2086 | bool should_link_to_dynsym_ : 1; |
| 2087 | // Whether this section should be written after all the input |
| 2088 | // sections are complete. |
| 2089 | bool after_input_sections_ : 1; |
| 2090 | // Whether this section requires post processing after all |
| 2091 | // relocations have been applied. |
| 2092 | bool requires_postprocessing_ : 1; |
| 2093 | // For SHT_TLS sections, the offset of this section relative to the base |
| 2094 | // of the TLS segment. |
| 2095 | uint64_t tls_offset_; |
| 2096 | }; |
| 2097 | |
| 2098 | // An output segment. PT_LOAD segments are built from collections of |
| 2099 | // output sections. Other segments typically point within PT_LOAD |
| 2100 | // segments, and are built directly as needed. |
| 2101 | |
| 2102 | class Output_segment |
| 2103 | { |
| 2104 | public: |
| 2105 | // Create an output segment, specifying the type and flags. |
| 2106 | Output_segment(elfcpp::Elf_Word, elfcpp::Elf_Word); |
| 2107 | |
| 2108 | // Return the virtual address. |
| 2109 | uint64_t |
| 2110 | vaddr() const |
| 2111 | { return this->vaddr_; } |
| 2112 | |
| 2113 | // Return the physical address. |
| 2114 | uint64_t |
| 2115 | paddr() const |
| 2116 | { return this->paddr_; } |
| 2117 | |
| 2118 | // Return the segment type. |
| 2119 | elfcpp::Elf_Word |
| 2120 | type() const |
| 2121 | { return this->type_; } |
| 2122 | |
| 2123 | // Return the segment flags. |
| 2124 | elfcpp::Elf_Word |
| 2125 | flags() const |
| 2126 | { return this->flags_; } |
| 2127 | |
| 2128 | // Return the memory size. |
| 2129 | uint64_t |
| 2130 | memsz() const |
| 2131 | { return this->memsz_; } |
| 2132 | |
| 2133 | // Return the file size. |
| 2134 | off_t |
| 2135 | filesz() const |
| 2136 | { return this->filesz_; } |
| 2137 | |
| 2138 | // Return the maximum alignment of the Output_data. |
| 2139 | uint64_t |
| 2140 | addralign(); |
| 2141 | |
| 2142 | // Add an Output_section to this segment. |
| 2143 | void |
| 2144 | add_output_section(Output_section* os, elfcpp::Elf_Word seg_flags) |
| 2145 | { this->add_output_section(os, seg_flags, false); } |
| 2146 | |
| 2147 | // Add an Output_section to the start of this segment. |
| 2148 | void |
| 2149 | add_initial_output_section(Output_section* os, elfcpp::Elf_Word seg_flags) |
| 2150 | { this->add_output_section(os, seg_flags, true); } |
| 2151 | |
| 2152 | // Add an Output_data (which is not an Output_section) to the start |
| 2153 | // of this segment. |
| 2154 | void |
| 2155 | add_initial_output_data(Output_data*); |
| 2156 | |
| 2157 | // Return the number of dynamic relocations applied to this segment. |
| 2158 | unsigned int |
| 2159 | dynamic_reloc_count() const; |
| 2160 | |
| 2161 | // Set the address of the segment to ADDR and the offset to *POFF |
| 2162 | // (aligned if necessary), and set the addresses and offsets of all |
| 2163 | // contained output sections accordingly. Set the section indexes |
| 2164 | // of all contained output sections starting with *PSHNDX. Return |
| 2165 | // the address of the immediately following segment. Update *POFF |
| 2166 | // and *PSHNDX. This should only be called for a PT_LOAD segment. |
| 2167 | uint64_t |
| 2168 | set_section_addresses(uint64_t addr, off_t* poff, unsigned int* pshndx); |
| 2169 | |
| 2170 | // Set the minimum alignment of this segment. This may be adjusted |
| 2171 | // upward based on the section alignments. |
| 2172 | void |
| 2173 | set_minimum_addralign(uint64_t align) |
| 2174 | { |
| 2175 | gold_assert(!this->is_align_known_); |
| 2176 | this->align_ = align; |
| 2177 | } |
| 2178 | |
| 2179 | // Set the offset of this segment based on the section. This should |
| 2180 | // only be called for a non-PT_LOAD segment. |
| 2181 | void |
| 2182 | set_offset(); |
| 2183 | |
| 2184 | // Set the TLS offsets of the sections contained in the PT_TLS segment. |
| 2185 | void |
| 2186 | set_tls_offsets(); |
| 2187 | |
| 2188 | // Return the number of output sections. |
| 2189 | unsigned int |
| 2190 | output_section_count() const; |
| 2191 | |
| 2192 | // Write the segment header into *OPHDR. |
| 2193 | template<int size, bool big_endian> |
| 2194 | void |
| 2195 | write_header(elfcpp::Phdr_write<size, big_endian>*); |
| 2196 | |
| 2197 | // Write the section headers of associated sections into V. |
| 2198 | template<int size, bool big_endian> |
| 2199 | unsigned char* |
| 2200 | write_section_headers(const Layout*, const Stringpool*, unsigned char* v, |
| 2201 | unsigned int* pshndx ACCEPT_SIZE_ENDIAN) const; |
| 2202 | |
| 2203 | private: |
| 2204 | Output_segment(const Output_segment&); |
| 2205 | Output_segment& operator=(const Output_segment&); |
| 2206 | |
| 2207 | typedef std::list<Output_data*> Output_data_list; |
| 2208 | |
| 2209 | // Add an Output_section to this segment, specifying front or back. |
| 2210 | void |
| 2211 | add_output_section(Output_section*, elfcpp::Elf_Word seg_flags, |
| 2212 | bool front); |
| 2213 | |
| 2214 | // Find the maximum alignment in an Output_data_list. |
| 2215 | static uint64_t |
| 2216 | maximum_alignment(const Output_data_list*); |
| 2217 | |
| 2218 | // Set the section addresses in an Output_data_list. |
| 2219 | uint64_t |
| 2220 | set_section_list_addresses(Output_data_list*, uint64_t addr, off_t* poff, |
| 2221 | unsigned int* pshndx); |
| 2222 | |
| 2223 | // Return the number of Output_sections in an Output_data_list. |
| 2224 | unsigned int |
| 2225 | output_section_count_list(const Output_data_list*) const; |
| 2226 | |
| 2227 | // Return the number of dynamic relocs in an Output_data_list. |
| 2228 | unsigned int |
| 2229 | dynamic_reloc_count_list(const Output_data_list*) const; |
| 2230 | |
| 2231 | // Write the section headers in the list into V. |
| 2232 | template<int size, bool big_endian> |
| 2233 | unsigned char* |
| 2234 | write_section_headers_list(const Layout*, const Stringpool*, |
| 2235 | const Output_data_list*, unsigned char* v, |
| 2236 | unsigned int* pshdx ACCEPT_SIZE_ENDIAN) const; |
| 2237 | |
| 2238 | // The list of output data with contents attached to this segment. |
| 2239 | Output_data_list output_data_; |
| 2240 | // The list of output data without contents attached to this segment. |
| 2241 | Output_data_list output_bss_; |
| 2242 | // The segment virtual address. |
| 2243 | uint64_t vaddr_; |
| 2244 | // The segment physical address. |
| 2245 | uint64_t paddr_; |
| 2246 | // The size of the segment in memory. |
| 2247 | uint64_t memsz_; |
| 2248 | // The segment alignment. The is_align_known_ field indicates |
| 2249 | // whether this has been finalized. It can be set to a minimum |
| 2250 | // value before it is finalized. |
| 2251 | uint64_t align_; |
| 2252 | // The offset of the segment data within the file. |
| 2253 | off_t offset_; |
| 2254 | // The size of the segment data in the file. |
| 2255 | off_t filesz_; |
| 2256 | // The segment type; |
| 2257 | elfcpp::Elf_Word type_; |
| 2258 | // The segment flags. |
| 2259 | elfcpp::Elf_Word flags_; |
| 2260 | // Whether we have finalized align_. |
| 2261 | bool is_align_known_; |
| 2262 | }; |
| 2263 | |
| 2264 | // This class represents the output file. |
| 2265 | |
| 2266 | class Output_file |
| 2267 | { |
| 2268 | public: |
| 2269 | Output_file(const General_options& options, Target*); |
| 2270 | |
| 2271 | // Get a pointer to the target. |
| 2272 | Target* |
| 2273 | target() const |
| 2274 | { return this->target_; } |
| 2275 | |
| 2276 | // Open the output file. FILE_SIZE is the final size of the file. |
| 2277 | void |
| 2278 | open(off_t file_size); |
| 2279 | |
| 2280 | // Resize the output file. |
| 2281 | void |
| 2282 | resize(off_t file_size); |
| 2283 | |
| 2284 | // Close the output file (flushing all buffered data) and make sure |
| 2285 | // there are no errors. |
| 2286 | void |
| 2287 | close(); |
| 2288 | |
| 2289 | // We currently always use mmap which makes the view handling quite |
| 2290 | // simple. In the future we may support other approaches. |
| 2291 | |
| 2292 | // Write data to the output file. |
| 2293 | void |
| 2294 | write(off_t offset, const void* data, size_t len) |
| 2295 | { memcpy(this->base_ + offset, data, len); } |
| 2296 | |
| 2297 | // Get a buffer to use to write to the file, given the offset into |
| 2298 | // the file and the size. |
| 2299 | unsigned char* |
| 2300 | get_output_view(off_t start, size_t size) |
| 2301 | { |
| 2302 | gold_assert(start >= 0 && start + size <= this->file_size_); |
| 2303 | return this->base_ + start; |
| 2304 | } |
| 2305 | |
| 2306 | // VIEW must have been returned by get_output_view. Write the |
| 2307 | // buffer to the file, passing in the offset and the size. |
| 2308 | void |
| 2309 | write_output_view(off_t, size_t, unsigned char*) |
| 2310 | { } |
| 2311 | |
| 2312 | // Get a read/write buffer. This is used when we want to write part |
| 2313 | // of the file, read it in, and write it again. |
| 2314 | unsigned char* |
| 2315 | get_input_output_view(off_t start, size_t size) |
| 2316 | { return this->get_output_view(start, size); } |
| 2317 | |
| 2318 | // Write a read/write buffer back to the file. |
| 2319 | void |
| 2320 | write_input_output_view(off_t, size_t, unsigned char*) |
| 2321 | { } |
| 2322 | |
| 2323 | // Get a read buffer. This is used when we just want to read part |
| 2324 | // of the file back it in. |
| 2325 | const unsigned char* |
| 2326 | get_input_view(off_t start, size_t size) |
| 2327 | { return this->get_output_view(start, size); } |
| 2328 | |
| 2329 | // Release a read bfufer. |
| 2330 | void |
| 2331 | free_input_view(off_t, size_t, const unsigned char*) |
| 2332 | { } |
| 2333 | |
| 2334 | private: |
| 2335 | // Map the file into memory and return a pointer to the map. |
| 2336 | void |
| 2337 | map(); |
| 2338 | |
| 2339 | // Unmap the file from memory (and flush to disk buffers). |
| 2340 | void |
| 2341 | unmap(); |
| 2342 | |
| 2343 | |
| 2344 | // General options. |
| 2345 | const General_options& options_; |
| 2346 | // Target. |
| 2347 | Target* target_; |
| 2348 | // File name. |
| 2349 | const char* name_; |
| 2350 | // File descriptor. |
| 2351 | int o_; |
| 2352 | // File size. |
| 2353 | off_t file_size_; |
| 2354 | // Base of file mapped into memory. |
| 2355 | unsigned char* base_; |
| 2356 | // True iff base_ points to a memory buffer rather than an output file. |
| 2357 | bool map_is_anonymous_; |
| 2358 | }; |
| 2359 | |
| 2360 | } // End namespace gold. |
| 2361 | |
| 2362 | #endif // !defined(GOLD_OUTPUT_H) |