| 1 | // inremental.cc -- incremental linking support for gold |
| 2 | |
| 3 | // Copyright 2009, 2010 Free Software Foundation, Inc. |
| 4 | // Written by Mikolaj Zalewski <mikolajz@google.com>. |
| 5 | |
| 6 | // This file is part of gold. |
| 7 | |
| 8 | // This program is free software; you can redistribute it and/or modify |
| 9 | // it under the terms of the GNU General Public License as published by |
| 10 | // the Free Software Foundation; either version 3 of the License, or |
| 11 | // (at your option) any later version. |
| 12 | |
| 13 | // This program is distributed in the hope that it will be useful, |
| 14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | // GNU General Public License for more details. |
| 17 | |
| 18 | // You should have received a copy of the GNU General Public License |
| 19 | // along with this program; if not, write to the Free Software |
| 20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | // MA 02110-1301, USA. |
| 22 | |
| 23 | #include "gold.h" |
| 24 | |
| 25 | #include <cstdarg> |
| 26 | #include "libiberty.h" |
| 27 | |
| 28 | #include "elfcpp.h" |
| 29 | #include "output.h" |
| 30 | #include "symtab.h" |
| 31 | #include "incremental.h" |
| 32 | #include "archive.h" |
| 33 | #include "output.h" |
| 34 | #include "target-select.h" |
| 35 | #include "target.h" |
| 36 | |
| 37 | namespace gold { |
| 38 | |
| 39 | // Version information. Will change frequently during the development, later |
| 40 | // we could think about backward (and forward?) compatibility. |
| 41 | const unsigned int INCREMENTAL_LINK_VERSION = 1; |
| 42 | |
| 43 | // This class manages the .gnu_incremental_inputs section, which holds |
| 44 | // the header information, a directory of input files, and separate |
| 45 | // entries for each input file. |
| 46 | |
| 47 | template<int size, bool big_endian> |
| 48 | class Output_section_incremental_inputs : public Output_section_data |
| 49 | { |
| 50 | public: |
| 51 | Output_section_incremental_inputs(const Incremental_inputs* inputs, |
| 52 | const Symbol_table* symtab) |
| 53 | : Output_section_data(size / 8), inputs_(inputs), symtab_(symtab) |
| 54 | { } |
| 55 | |
| 56 | protected: |
| 57 | // Set the final data size. |
| 58 | void |
| 59 | set_final_data_size(); |
| 60 | |
| 61 | // Write the data to the file. |
| 62 | void |
| 63 | do_write(Output_file*); |
| 64 | |
| 65 | // Write to a map file. |
| 66 | void |
| 67 | do_print_to_mapfile(Mapfile* mapfile) const |
| 68 | { mapfile->print_output_data(this, _("** incremental_inputs")); } |
| 69 | |
| 70 | private: |
| 71 | // Write the section header. |
| 72 | unsigned char* |
| 73 | write_header(unsigned char* pov, unsigned int input_file_count, |
| 74 | section_offset_type command_line_offset); |
| 75 | |
| 76 | // Write the input file entries. |
| 77 | unsigned char* |
| 78 | write_input_files(unsigned char* oview, unsigned char* pov, |
| 79 | Stringpool* strtab); |
| 80 | |
| 81 | // Write the supplemental information blocks. |
| 82 | unsigned char* |
| 83 | write_info_blocks(unsigned char* oview, unsigned char* pov, |
| 84 | Stringpool* strtab, unsigned int* global_syms, |
| 85 | unsigned int global_sym_count); |
| 86 | |
| 87 | // Write the contents of the .gnu_incremental_symtab section. |
| 88 | void |
| 89 | write_symtab(unsigned char* pov, unsigned int* global_syms, |
| 90 | unsigned int global_sym_count); |
| 91 | |
| 92 | // Write the contents of the .gnu_incremental_got_plt section. |
| 93 | void |
| 94 | write_got_plt(unsigned char* pov, off_t view_size); |
| 95 | |
| 96 | // Typedefs for writing the data to the output sections. |
| 97 | typedef elfcpp::Swap<size, big_endian> Swap; |
| 98 | typedef elfcpp::Swap<16, big_endian> Swap16; |
| 99 | typedef elfcpp::Swap<32, big_endian> Swap32; |
| 100 | typedef elfcpp::Swap<64, big_endian> Swap64; |
| 101 | |
| 102 | // Sizes of various structures. |
| 103 | static const int sizeof_addr = size / 8; |
| 104 | static const int header_size = 16; |
| 105 | static const int input_entry_size = 24; |
| 106 | |
| 107 | // The Incremental_inputs object. |
| 108 | const Incremental_inputs* inputs_; |
| 109 | |
| 110 | // The symbol table. |
| 111 | const Symbol_table* symtab_; |
| 112 | }; |
| 113 | |
| 114 | // Inform the user why we don't do an incremental link. Not called in |
| 115 | // the obvious case of missing output file. TODO: Is this helpful? |
| 116 | |
| 117 | void |
| 118 | vexplain_no_incremental(const char* format, va_list args) |
| 119 | { |
| 120 | char* buf = NULL; |
| 121 | if (vasprintf(&buf, format, args) < 0) |
| 122 | gold_nomem(); |
| 123 | gold_info(_("the link might take longer: " |
| 124 | "cannot perform incremental link: %s"), buf); |
| 125 | free(buf); |
| 126 | } |
| 127 | |
| 128 | void |
| 129 | explain_no_incremental(const char* format, ...) |
| 130 | { |
| 131 | va_list args; |
| 132 | va_start(args, format); |
| 133 | vexplain_no_incremental(format, args); |
| 134 | va_end(args); |
| 135 | } |
| 136 | |
| 137 | // Report an error. |
| 138 | |
| 139 | void |
| 140 | Incremental_binary::error(const char* format, ...) const |
| 141 | { |
| 142 | va_list args; |
| 143 | va_start(args, format); |
| 144 | // Current code only checks if the file can be used for incremental linking, |
| 145 | // so errors shouldn't fail the build, but only result in a fallback to a |
| 146 | // full build. |
| 147 | // TODO: when we implement incremental editing of the file, we may need a |
| 148 | // flag that will cause errors to be treated seriously. |
| 149 | vexplain_no_incremental(format, args); |
| 150 | va_end(args); |
| 151 | } |
| 152 | |
| 153 | // Find the .gnu_incremental_inputs section and related sections. |
| 154 | |
| 155 | template<int size, bool big_endian> |
| 156 | bool |
| 157 | Sized_incremental_binary<size, big_endian>::do_find_incremental_inputs_sections( |
| 158 | unsigned int* p_inputs_shndx, |
| 159 | unsigned int* p_symtab_shndx, |
| 160 | unsigned int* p_relocs_shndx, |
| 161 | unsigned int* p_got_plt_shndx, |
| 162 | unsigned int* p_strtab_shndx) |
| 163 | { |
| 164 | unsigned int inputs_shndx = |
| 165 | this->elf_file_.find_section_by_type(elfcpp::SHT_GNU_INCREMENTAL_INPUTS); |
| 166 | if (inputs_shndx == elfcpp::SHN_UNDEF) // Not found. |
| 167 | return false; |
| 168 | |
| 169 | unsigned int symtab_shndx = |
| 170 | this->elf_file_.find_section_by_type(elfcpp::SHT_GNU_INCREMENTAL_SYMTAB); |
| 171 | if (symtab_shndx == elfcpp::SHN_UNDEF) // Not found. |
| 172 | return false; |
| 173 | if (this->elf_file_.section_link(symtab_shndx) != inputs_shndx) |
| 174 | return false; |
| 175 | |
| 176 | unsigned int relocs_shndx = |
| 177 | this->elf_file_.find_section_by_type(elfcpp::SHT_GNU_INCREMENTAL_RELOCS); |
| 178 | if (relocs_shndx == elfcpp::SHN_UNDEF) // Not found. |
| 179 | return false; |
| 180 | if (this->elf_file_.section_link(relocs_shndx) != inputs_shndx) |
| 181 | return false; |
| 182 | |
| 183 | unsigned int got_plt_shndx = |
| 184 | this->elf_file_.find_section_by_type(elfcpp::SHT_GNU_INCREMENTAL_GOT_PLT); |
| 185 | if (got_plt_shndx == elfcpp::SHN_UNDEF) // Not found. |
| 186 | return false; |
| 187 | if (this->elf_file_.section_link(got_plt_shndx) != inputs_shndx) |
| 188 | return false; |
| 189 | |
| 190 | unsigned int strtab_shndx = this->elf_file_.section_link(inputs_shndx); |
| 191 | if (strtab_shndx == elfcpp::SHN_UNDEF |
| 192 | || strtab_shndx > this->elf_file_.shnum() |
| 193 | || this->elf_file_.section_type(strtab_shndx) != elfcpp::SHT_STRTAB) |
| 194 | return false; |
| 195 | |
| 196 | if (p_inputs_shndx != NULL) |
| 197 | *p_inputs_shndx = inputs_shndx; |
| 198 | if (p_symtab_shndx != NULL) |
| 199 | *p_symtab_shndx = symtab_shndx; |
| 200 | if (p_relocs_shndx != NULL) |
| 201 | *p_relocs_shndx = relocs_shndx; |
| 202 | if (p_got_plt_shndx != NULL) |
| 203 | *p_got_plt_shndx = got_plt_shndx; |
| 204 | if (p_strtab_shndx != NULL) |
| 205 | *p_strtab_shndx = strtab_shndx; |
| 206 | return true; |
| 207 | } |
| 208 | |
| 209 | // Determine whether an incremental link based on the existing output file |
| 210 | // can be done. |
| 211 | |
| 212 | template<int size, bool big_endian> |
| 213 | bool |
| 214 | Sized_incremental_binary<size, big_endian>::do_check_inputs( |
| 215 | Incremental_inputs* incremental_inputs) |
| 216 | { |
| 217 | unsigned int inputs_shndx; |
| 218 | unsigned int symtab_shndx; |
| 219 | unsigned int relocs_shndx; |
| 220 | unsigned int plt_got_shndx; |
| 221 | unsigned int strtab_shndx; |
| 222 | |
| 223 | if (!do_find_incremental_inputs_sections(&inputs_shndx, &symtab_shndx, |
| 224 | &relocs_shndx, &plt_got_shndx, |
| 225 | &strtab_shndx)) |
| 226 | { |
| 227 | explain_no_incremental(_("no incremental data from previous build")); |
| 228 | return false; |
| 229 | } |
| 230 | |
| 231 | Location inputs_location(this->elf_file_.section_contents(inputs_shndx)); |
| 232 | Location symtab_location(this->elf_file_.section_contents(symtab_shndx)); |
| 233 | Location relocs_location(this->elf_file_.section_contents(relocs_shndx)); |
| 234 | Location strtab_location(this->elf_file_.section_contents(strtab_shndx)); |
| 235 | |
| 236 | View inputs_view(view(inputs_location)); |
| 237 | View symtab_view(view(symtab_location)); |
| 238 | View relocs_view(view(relocs_location)); |
| 239 | View strtab_view(view(strtab_location)); |
| 240 | |
| 241 | elfcpp::Elf_strtab strtab(strtab_view.data(), strtab_location.data_size); |
| 242 | |
| 243 | Incremental_inputs_reader<size, big_endian> |
| 244 | incoming_inputs(inputs_view.data(), strtab); |
| 245 | |
| 246 | if (incoming_inputs.version() != INCREMENTAL_LINK_VERSION) |
| 247 | { |
| 248 | explain_no_incremental(_("different version of incremental build data")); |
| 249 | return false; |
| 250 | } |
| 251 | |
| 252 | if (incremental_inputs->command_line() != incoming_inputs.command_line()) |
| 253 | { |
| 254 | explain_no_incremental(_("command line changed")); |
| 255 | return false; |
| 256 | } |
| 257 | |
| 258 | // TODO: compare incremental_inputs->inputs() with entries in data_view. |
| 259 | |
| 260 | return true; |
| 261 | } |
| 262 | |
| 263 | namespace |
| 264 | { |
| 265 | |
| 266 | // Create a Sized_incremental_binary object of the specified size and |
| 267 | // endianness. Fails if the target architecture is not supported. |
| 268 | |
| 269 | template<int size, bool big_endian> |
| 270 | Incremental_binary* |
| 271 | make_sized_incremental_binary(Output_file* file, |
| 272 | const elfcpp::Ehdr<size, big_endian>& ehdr) |
| 273 | { |
| 274 | Target* target = select_target(ehdr.get_e_machine(), size, big_endian, |
| 275 | ehdr.get_e_ident()[elfcpp::EI_OSABI], |
| 276 | ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]); |
| 277 | if (target == NULL) |
| 278 | { |
| 279 | explain_no_incremental(_("unsupported ELF machine number %d"), |
| 280 | ehdr.get_e_machine()); |
| 281 | return NULL; |
| 282 | } |
| 283 | |
| 284 | if (!parameters->target_valid()) |
| 285 | set_parameters_target(target); |
| 286 | else if (target != ¶meters->target()) |
| 287 | gold_error(_("%s: incompatible target"), file->filename()); |
| 288 | |
| 289 | return new Sized_incremental_binary<size, big_endian>(file, ehdr, target); |
| 290 | } |
| 291 | |
| 292 | } // End of anonymous namespace. |
| 293 | |
| 294 | // Create an Incremental_binary object for FILE. Returns NULL is this is not |
| 295 | // possible, e.g. FILE is not an ELF file or has an unsupported target. FILE |
| 296 | // should be opened. |
| 297 | |
| 298 | Incremental_binary* |
| 299 | open_incremental_binary(Output_file* file) |
| 300 | { |
| 301 | off_t filesize = file->filesize(); |
| 302 | int want = elfcpp::Elf_recognizer::max_header_size; |
| 303 | if (filesize < want) |
| 304 | want = filesize; |
| 305 | |
| 306 | const unsigned char* p = file->get_input_view(0, want); |
| 307 | if (!elfcpp::Elf_recognizer::is_elf_file(p, want)) |
| 308 | { |
| 309 | explain_no_incremental(_("output is not an ELF file.")); |
| 310 | return NULL; |
| 311 | } |
| 312 | |
| 313 | int size = 0; |
| 314 | bool big_endian = false; |
| 315 | std::string error; |
| 316 | if (!elfcpp::Elf_recognizer::is_valid_header(p, want, &size, &big_endian, |
| 317 | &error)) |
| 318 | { |
| 319 | explain_no_incremental(error.c_str()); |
| 320 | return NULL; |
| 321 | } |
| 322 | |
| 323 | Incremental_binary* result = NULL; |
| 324 | if (size == 32) |
| 325 | { |
| 326 | if (big_endian) |
| 327 | { |
| 328 | #ifdef HAVE_TARGET_32_BIG |
| 329 | result = make_sized_incremental_binary<32, true>( |
| 330 | file, elfcpp::Ehdr<32, true>(p)); |
| 331 | #else |
| 332 | explain_no_incremental(_("unsupported file: 32-bit, big-endian")); |
| 333 | #endif |
| 334 | } |
| 335 | else |
| 336 | { |
| 337 | #ifdef HAVE_TARGET_32_LITTLE |
| 338 | result = make_sized_incremental_binary<32, false>( |
| 339 | file, elfcpp::Ehdr<32, false>(p)); |
| 340 | #else |
| 341 | explain_no_incremental(_("unsupported file: 32-bit, little-endian")); |
| 342 | #endif |
| 343 | } |
| 344 | } |
| 345 | else if (size == 64) |
| 346 | { |
| 347 | if (big_endian) |
| 348 | { |
| 349 | #ifdef HAVE_TARGET_64_BIG |
| 350 | result = make_sized_incremental_binary<64, true>( |
| 351 | file, elfcpp::Ehdr<64, true>(p)); |
| 352 | #else |
| 353 | explain_no_incremental(_("unsupported file: 64-bit, big-endian")); |
| 354 | #endif |
| 355 | } |
| 356 | else |
| 357 | { |
| 358 | #ifdef HAVE_TARGET_64_LITTLE |
| 359 | result = make_sized_incremental_binary<64, false>( |
| 360 | file, elfcpp::Ehdr<64, false>(p)); |
| 361 | #else |
| 362 | explain_no_incremental(_("unsupported file: 64-bit, little-endian")); |
| 363 | #endif |
| 364 | } |
| 365 | } |
| 366 | else |
| 367 | gold_unreachable(); |
| 368 | |
| 369 | return result; |
| 370 | } |
| 371 | |
| 372 | // Analyzes the output file to check if incremental linking is possible and |
| 373 | // (to be done) what files need to be relinked. |
| 374 | |
| 375 | bool |
| 376 | Incremental_checker::can_incrementally_link_output_file() |
| 377 | { |
| 378 | Output_file output(this->output_name_); |
| 379 | if (!output.open_for_modification()) |
| 380 | return false; |
| 381 | Incremental_binary* binary = open_incremental_binary(&output); |
| 382 | if (binary == NULL) |
| 383 | return false; |
| 384 | return binary->check_inputs(this->incremental_inputs_); |
| 385 | } |
| 386 | |
| 387 | // Class Incremental_inputs. |
| 388 | |
| 389 | // Add the command line to the string table, setting |
| 390 | // command_line_key_. In incremental builds, the command line is |
| 391 | // stored in .gnu_incremental_inputs so that the next linker run can |
| 392 | // check if the command line options didn't change. |
| 393 | |
| 394 | void |
| 395 | Incremental_inputs::report_command_line(int argc, const char* const* argv) |
| 396 | { |
| 397 | // Always store 'gold' as argv[0] to avoid a full relink if the user used a |
| 398 | // different path to the linker. |
| 399 | std::string args("gold"); |
| 400 | // Copied from collect_argv in main.cc. |
| 401 | for (int i = 1; i < argc; ++i) |
| 402 | { |
| 403 | // Adding/removing these options should not result in a full relink. |
| 404 | if (strcmp(argv[i], "--incremental") == 0 |
| 405 | || strcmp(argv[i], "--incremental-full") == 0 |
| 406 | || strcmp(argv[i], "--incremental-update") == 0 |
| 407 | || strcmp(argv[i], "--incremental-changed") == 0 |
| 408 | || strcmp(argv[i], "--incremental-unchanged") == 0 |
| 409 | || strcmp(argv[i], "--incremental-unknown") == 0) |
| 410 | continue; |
| 411 | |
| 412 | args.append(" '"); |
| 413 | // Now append argv[i], but with all single-quotes escaped |
| 414 | const char* argpos = argv[i]; |
| 415 | while (1) |
| 416 | { |
| 417 | const int len = strcspn(argpos, "'"); |
| 418 | args.append(argpos, len); |
| 419 | if (argpos[len] == '\0') |
| 420 | break; |
| 421 | args.append("'\"'\"'"); |
| 422 | argpos += len + 1; |
| 423 | } |
| 424 | args.append("'"); |
| 425 | } |
| 426 | |
| 427 | this->command_line_ = args; |
| 428 | this->strtab_->add(this->command_line_.c_str(), false, |
| 429 | &this->command_line_key_); |
| 430 | } |
| 431 | |
| 432 | // Record the input archive file ARCHIVE. This is called by the |
| 433 | // Add_archive_symbols task before determining which archive members |
| 434 | // to include. We create the Incremental_archive_entry here and |
| 435 | // attach it to the Archive, but we do not add it to the list of |
| 436 | // input objects until report_archive_end is called. |
| 437 | |
| 438 | void |
| 439 | Incremental_inputs::report_archive_begin(Archive* arch) |
| 440 | { |
| 441 | Stringpool::Key filename_key; |
| 442 | Timespec mtime = arch->file().get_mtime(); |
| 443 | |
| 444 | this->strtab_->add(arch->filename().c_str(), false, &filename_key); |
| 445 | Incremental_archive_entry* entry = |
| 446 | new Incremental_archive_entry(filename_key, arch, mtime); |
| 447 | arch->set_incremental_info(entry); |
| 448 | } |
| 449 | |
| 450 | // Finish recording the input archive file ARCHIVE. This is called by the |
| 451 | // Add_archive_symbols task after determining which archive members |
| 452 | // to include. |
| 453 | |
| 454 | void |
| 455 | Incremental_inputs::report_archive_end(Archive* arch) |
| 456 | { |
| 457 | Incremental_archive_entry* entry = arch->incremental_info(); |
| 458 | |
| 459 | gold_assert(entry != NULL); |
| 460 | |
| 461 | // Collect unused global symbols. |
| 462 | for (Archive::Unused_symbol_iterator p = arch->unused_symbols_begin(); |
| 463 | p != arch->unused_symbols_end(); |
| 464 | ++p) |
| 465 | { |
| 466 | Stringpool::Key symbol_key; |
| 467 | this->strtab_->add(*p, true, &symbol_key); |
| 468 | entry->add_unused_global_symbol(symbol_key); |
| 469 | } |
| 470 | this->inputs_.push_back(entry); |
| 471 | } |
| 472 | |
| 473 | // Record the input object file OBJ. If ARCH is not NULL, attach |
| 474 | // the object file to the archive. This is called by the |
| 475 | // Add_symbols task after finding out the type of the file. |
| 476 | |
| 477 | void |
| 478 | Incremental_inputs::report_object(Object* obj, Archive* arch) |
| 479 | { |
| 480 | Stringpool::Key filename_key; |
| 481 | Timespec mtime = obj->input_file()->file().get_mtime(); |
| 482 | |
| 483 | this->strtab_->add(obj->name().c_str(), false, &filename_key); |
| 484 | Incremental_object_entry* obj_entry = |
| 485 | new Incremental_object_entry(filename_key, obj, mtime); |
| 486 | this->inputs_.push_back(obj_entry); |
| 487 | |
| 488 | if (arch != NULL) |
| 489 | { |
| 490 | Incremental_archive_entry* arch_entry = arch->incremental_info(); |
| 491 | gold_assert(arch_entry != NULL); |
| 492 | arch_entry->add_object(obj_entry); |
| 493 | } |
| 494 | |
| 495 | this->current_object_ = obj; |
| 496 | this->current_object_entry_ = obj_entry; |
| 497 | } |
| 498 | |
| 499 | // Record the input object file OBJ. If ARCH is not NULL, attach |
| 500 | // the object file to the archive. This is called by the |
| 501 | // Add_symbols task after finding out the type of the file. |
| 502 | |
| 503 | void |
| 504 | Incremental_inputs::report_input_section(Object* obj, unsigned int shndx, |
| 505 | const char* name, off_t sh_size) |
| 506 | { |
| 507 | Stringpool::Key key = 0; |
| 508 | |
| 509 | if (name != NULL) |
| 510 | this->strtab_->add(name, true, &key); |
| 511 | |
| 512 | gold_assert(obj == this->current_object_); |
| 513 | this->current_object_entry_->add_input_section(shndx, key, sh_size); |
| 514 | } |
| 515 | |
| 516 | // Record that the input argument INPUT is a script SCRIPT. This is |
| 517 | // called by read_script after parsing the script and reading the list |
| 518 | // of inputs added by this script. |
| 519 | |
| 520 | void |
| 521 | Incremental_inputs::report_script(const std::string& filename, |
| 522 | Script_info* script, Timespec mtime) |
| 523 | { |
| 524 | Stringpool::Key filename_key; |
| 525 | |
| 526 | this->strtab_->add(filename.c_str(), false, &filename_key); |
| 527 | Incremental_script_entry* entry = |
| 528 | new Incremental_script_entry(filename_key, script, mtime); |
| 529 | this->inputs_.push_back(entry); |
| 530 | } |
| 531 | |
| 532 | // Finalize the incremental link information. Called from |
| 533 | // Layout::finalize. |
| 534 | |
| 535 | void |
| 536 | Incremental_inputs::finalize() |
| 537 | { |
| 538 | // Finalize the string table. |
| 539 | this->strtab_->set_string_offsets(); |
| 540 | } |
| 541 | |
| 542 | // Create the .gnu_incremental_inputs, _symtab, and _relocs input sections. |
| 543 | |
| 544 | void |
| 545 | Incremental_inputs::create_data_sections(Symbol_table* symtab) |
| 546 | { |
| 547 | switch (parameters->size_and_endianness()) |
| 548 | { |
| 549 | #ifdef HAVE_TARGET_32_LITTLE |
| 550 | case Parameters::TARGET_32_LITTLE: |
| 551 | this->inputs_section_ = |
| 552 | new Output_section_incremental_inputs<32, false>(this, symtab); |
| 553 | break; |
| 554 | #endif |
| 555 | #ifdef HAVE_TARGET_32_BIG |
| 556 | case Parameters::TARGET_32_BIG: |
| 557 | this->inputs_section_ = |
| 558 | new Output_section_incremental_inputs<32, true>(this, symtab); |
| 559 | break; |
| 560 | #endif |
| 561 | #ifdef HAVE_TARGET_64_LITTLE |
| 562 | case Parameters::TARGET_64_LITTLE: |
| 563 | this->inputs_section_ = |
| 564 | new Output_section_incremental_inputs<64, false>(this, symtab); |
| 565 | break; |
| 566 | #endif |
| 567 | #ifdef HAVE_TARGET_64_BIG |
| 568 | case Parameters::TARGET_64_BIG: |
| 569 | this->inputs_section_ = |
| 570 | new Output_section_incremental_inputs<64, true>(this, symtab); |
| 571 | break; |
| 572 | #endif |
| 573 | default: |
| 574 | gold_unreachable(); |
| 575 | } |
| 576 | this->symtab_section_ = new Output_data_space(4, "** incremental_symtab"); |
| 577 | this->relocs_section_ = new Output_data_space(4, "** incremental_relocs"); |
| 578 | this->got_plt_section_ = new Output_data_space(4, "** incremental_got_plt"); |
| 579 | } |
| 580 | |
| 581 | // Return the sh_entsize value for the .gnu_incremental_relocs section. |
| 582 | unsigned int |
| 583 | Incremental_inputs::relocs_entsize() const |
| 584 | { |
| 585 | return 8 + 2 * parameters->target().get_size() / 8; |
| 586 | } |
| 587 | |
| 588 | // Class Output_section_incremental_inputs. |
| 589 | |
| 590 | // Finalize the offsets for each input section and supplemental info block, |
| 591 | // and set the final data size of the incremental output sections. |
| 592 | |
| 593 | template<int size, bool big_endian> |
| 594 | void |
| 595 | Output_section_incremental_inputs<size, big_endian>::set_final_data_size() |
| 596 | { |
| 597 | const Incremental_inputs* inputs = this->inputs_; |
| 598 | const unsigned int sizeof_addr = size / 8; |
| 599 | const unsigned int rel_size = 8 + 2 * sizeof_addr; |
| 600 | |
| 601 | // Offset of each input entry. |
| 602 | unsigned int input_offset = this->header_size; |
| 603 | |
| 604 | // Offset of each supplemental info block. |
| 605 | unsigned int info_offset = this->header_size; |
| 606 | info_offset += this->input_entry_size * inputs->input_file_count(); |
| 607 | |
| 608 | // Count each input file and its supplemental information block. |
| 609 | for (Incremental_inputs::Input_list::const_iterator p = |
| 610 | inputs->input_files().begin(); |
| 611 | p != inputs->input_files().end(); |
| 612 | ++p) |
| 613 | { |
| 614 | // Set the offset of the input file entry. |
| 615 | (*p)->set_offset(input_offset); |
| 616 | input_offset += this->input_entry_size; |
| 617 | |
| 618 | // Set the offset of the supplemental info block. |
| 619 | switch ((*p)->type()) |
| 620 | { |
| 621 | case INCREMENTAL_INPUT_SCRIPT: |
| 622 | // No supplemental info for a script. |
| 623 | (*p)->set_info_offset(0); |
| 624 | break; |
| 625 | case INCREMENTAL_INPUT_OBJECT: |
| 626 | case INCREMENTAL_INPUT_ARCHIVE_MEMBER: |
| 627 | { |
| 628 | Incremental_object_entry* entry = (*p)->object_entry(); |
| 629 | gold_assert(entry != NULL); |
| 630 | (*p)->set_info_offset(info_offset); |
| 631 | // Input section count + global symbol count. |
| 632 | info_offset += 8; |
| 633 | // Each input section. |
| 634 | info_offset += (entry->get_input_section_count() |
| 635 | * (8 + 2 * sizeof_addr)); |
| 636 | // Each global symbol. |
| 637 | const Object::Symbols* syms = entry->object()->get_global_symbols(); |
| 638 | info_offset += syms->size() * 16; |
| 639 | } |
| 640 | break; |
| 641 | case INCREMENTAL_INPUT_SHARED_LIBRARY: |
| 642 | { |
| 643 | Incremental_object_entry* entry = (*p)->object_entry(); |
| 644 | gold_assert(entry != NULL); |
| 645 | (*p)->set_info_offset(info_offset); |
| 646 | // Global symbol count. |
| 647 | info_offset += 4; |
| 648 | // Each global symbol. |
| 649 | const Object::Symbols* syms = entry->object()->get_global_symbols(); |
| 650 | unsigned int nsyms = syms != NULL ? syms->size() : 0; |
| 651 | info_offset += nsyms * 4; |
| 652 | } |
| 653 | break; |
| 654 | case INCREMENTAL_INPUT_ARCHIVE: |
| 655 | { |
| 656 | Incremental_archive_entry* entry = (*p)->archive_entry(); |
| 657 | gold_assert(entry != NULL); |
| 658 | (*p)->set_info_offset(info_offset); |
| 659 | // Member count + unused global symbol count. |
| 660 | info_offset += 8; |
| 661 | // Each member. |
| 662 | info_offset += (entry->get_member_count() * 4); |
| 663 | // Each global symbol. |
| 664 | info_offset += (entry->get_unused_global_symbol_count() * 4); |
| 665 | } |
| 666 | break; |
| 667 | default: |
| 668 | gold_unreachable(); |
| 669 | } |
| 670 | } |
| 671 | |
| 672 | this->set_data_size(info_offset); |
| 673 | |
| 674 | // Set the size of the .gnu_incremental_symtab section. |
| 675 | inputs->symtab_section()->set_current_data_size(this->symtab_->output_count() |
| 676 | * sizeof(unsigned int)); |
| 677 | |
| 678 | // Set the size of the .gnu_incremental_relocs section. |
| 679 | inputs->relocs_section()->set_current_data_size(inputs->get_reloc_count() |
| 680 | * rel_size); |
| 681 | |
| 682 | // Set the size of the .gnu_incremental_got_plt section. |
| 683 | Sized_target<size, big_endian>* target = |
| 684 | parameters->sized_target<size, big_endian>(); |
| 685 | unsigned int got_count = target->got_entry_count(); |
| 686 | unsigned int plt_count = target->plt_entry_count(); |
| 687 | unsigned int got_plt_size = 8; // GOT entry count, PLT entry count. |
| 688 | got_plt_size = (got_plt_size + got_count + 3) & ~3; // GOT type array. |
| 689 | got_plt_size += got_count * 4 + plt_count * 4; // GOT array, PLT array. |
| 690 | inputs->got_plt_section()->set_current_data_size(got_plt_size); |
| 691 | } |
| 692 | |
| 693 | // Write the contents of the .gnu_incremental_inputs and |
| 694 | // .gnu_incremental_symtab sections. |
| 695 | |
| 696 | template<int size, bool big_endian> |
| 697 | void |
| 698 | Output_section_incremental_inputs<size, big_endian>::do_write(Output_file* of) |
| 699 | { |
| 700 | const Incremental_inputs* inputs = this->inputs_; |
| 701 | Stringpool* strtab = inputs->get_stringpool(); |
| 702 | |
| 703 | // Get a view into the .gnu_incremental_inputs section. |
| 704 | const off_t off = this->offset(); |
| 705 | const off_t oview_size = this->data_size(); |
| 706 | unsigned char* const oview = of->get_output_view(off, oview_size); |
| 707 | unsigned char* pov = oview; |
| 708 | |
| 709 | // Get a view into the .gnu_incremental_symtab section. |
| 710 | const off_t symtab_off = inputs->symtab_section()->offset(); |
| 711 | const off_t symtab_size = inputs->symtab_section()->data_size(); |
| 712 | unsigned char* const symtab_view = of->get_output_view(symtab_off, |
| 713 | symtab_size); |
| 714 | |
| 715 | // Allocate an array of linked list heads for the .gnu_incremental_symtab |
| 716 | // section. Each element corresponds to a global symbol in the output |
| 717 | // symbol table, and points to the head of the linked list that threads |
| 718 | // through the object file input entries. The value of each element |
| 719 | // is the section-relative offset to a global symbol entry in a |
| 720 | // supplemental information block. |
| 721 | unsigned int global_sym_count = this->symtab_->output_count(); |
| 722 | unsigned int* global_syms = new unsigned int[global_sym_count]; |
| 723 | memset(global_syms, 0, global_sym_count * sizeof(unsigned int)); |
| 724 | |
| 725 | // Write the section header. |
| 726 | Stringpool::Key command_line_key = inputs->command_line_key(); |
| 727 | pov = this->write_header(pov, inputs->input_file_count(), |
| 728 | strtab->get_offset_from_key(command_line_key)); |
| 729 | |
| 730 | // Write the list of input files. |
| 731 | pov = this->write_input_files(oview, pov, strtab); |
| 732 | |
| 733 | // Write the supplemental information blocks for each input file. |
| 734 | pov = this->write_info_blocks(oview, pov, strtab, global_syms, |
| 735 | global_sym_count); |
| 736 | |
| 737 | gold_assert(pov - oview == oview_size); |
| 738 | |
| 739 | // Write the .gnu_incremental_symtab section. |
| 740 | gold_assert(global_sym_count * 4 == symtab_size); |
| 741 | this->write_symtab(symtab_view, global_syms, global_sym_count); |
| 742 | |
| 743 | delete[] global_syms; |
| 744 | |
| 745 | // Write the .gnu_incremental_got_plt section. |
| 746 | const off_t got_plt_off = inputs->got_plt_section()->offset(); |
| 747 | const off_t got_plt_size = inputs->got_plt_section()->data_size(); |
| 748 | unsigned char* const got_plt_view = of->get_output_view(got_plt_off, |
| 749 | got_plt_size); |
| 750 | this->write_got_plt(got_plt_view, got_plt_size); |
| 751 | |
| 752 | of->write_output_view(off, oview_size, oview); |
| 753 | of->write_output_view(symtab_off, symtab_size, symtab_view); |
| 754 | of->write_output_view(got_plt_off, got_plt_size, got_plt_view); |
| 755 | } |
| 756 | |
| 757 | // Write the section header: version, input file count, offset of command line |
| 758 | // in the string table, and 4 bytes of padding. |
| 759 | |
| 760 | template<int size, bool big_endian> |
| 761 | unsigned char* |
| 762 | Output_section_incremental_inputs<size, big_endian>::write_header( |
| 763 | unsigned char* pov, |
| 764 | unsigned int input_file_count, |
| 765 | section_offset_type command_line_offset) |
| 766 | { |
| 767 | Swap32::writeval(pov, INCREMENTAL_LINK_VERSION); |
| 768 | Swap32::writeval(pov + 4, input_file_count); |
| 769 | Swap32::writeval(pov + 8, command_line_offset); |
| 770 | Swap32::writeval(pov + 12, 0); |
| 771 | return pov + this->header_size; |
| 772 | } |
| 773 | |
| 774 | // Write the input file entries. |
| 775 | |
| 776 | template<int size, bool big_endian> |
| 777 | unsigned char* |
| 778 | Output_section_incremental_inputs<size, big_endian>::write_input_files( |
| 779 | unsigned char* oview, |
| 780 | unsigned char* pov, |
| 781 | Stringpool* strtab) |
| 782 | { |
| 783 | const Incremental_inputs* inputs = this->inputs_; |
| 784 | |
| 785 | for (Incremental_inputs::Input_list::const_iterator p = |
| 786 | inputs->input_files().begin(); |
| 787 | p != inputs->input_files().end(); |
| 788 | ++p) |
| 789 | { |
| 790 | gold_assert(static_cast<unsigned int>(pov - oview) == (*p)->get_offset()); |
| 791 | section_offset_type filename_offset = |
| 792 | strtab->get_offset_from_key((*p)->get_filename_key()); |
| 793 | const Timespec& mtime = (*p)->get_mtime(); |
| 794 | Swap32::writeval(pov, filename_offset); |
| 795 | Swap32::writeval(pov + 4, (*p)->get_info_offset()); |
| 796 | Swap64::writeval(pov + 8, mtime.seconds); |
| 797 | Swap32::writeval(pov + 16, mtime.nanoseconds); |
| 798 | Swap16::writeval(pov + 20, (*p)->type()); |
| 799 | Swap16::writeval(pov + 22, 0); |
| 800 | pov += this->input_entry_size; |
| 801 | } |
| 802 | return pov; |
| 803 | } |
| 804 | |
| 805 | // Write the supplemental information blocks. |
| 806 | |
| 807 | template<int size, bool big_endian> |
| 808 | unsigned char* |
| 809 | Output_section_incremental_inputs<size, big_endian>::write_info_blocks( |
| 810 | unsigned char* oview, |
| 811 | unsigned char* pov, |
| 812 | Stringpool* strtab, |
| 813 | unsigned int* global_syms, |
| 814 | unsigned int global_sym_count) |
| 815 | { |
| 816 | const Incremental_inputs* inputs = this->inputs_; |
| 817 | unsigned int first_global_index = this->symtab_->first_global_index(); |
| 818 | |
| 819 | for (Incremental_inputs::Input_list::const_iterator p = |
| 820 | inputs->input_files().begin(); |
| 821 | p != inputs->input_files().end(); |
| 822 | ++p) |
| 823 | { |
| 824 | switch ((*p)->type()) |
| 825 | { |
| 826 | case INCREMENTAL_INPUT_SCRIPT: |
| 827 | // No supplemental info for a script. |
| 828 | break; |
| 829 | |
| 830 | case INCREMENTAL_INPUT_OBJECT: |
| 831 | case INCREMENTAL_INPUT_ARCHIVE_MEMBER: |
| 832 | { |
| 833 | gold_assert(static_cast<unsigned int>(pov - oview) |
| 834 | == (*p)->get_info_offset()); |
| 835 | Incremental_object_entry* entry = (*p)->object_entry(); |
| 836 | gold_assert(entry != NULL); |
| 837 | const Object* obj = entry->object(); |
| 838 | const Object::Symbols* syms = obj->get_global_symbols(); |
| 839 | // Write the input section count and global symbol count. |
| 840 | unsigned int nsections = entry->get_input_section_count(); |
| 841 | unsigned int nsyms = syms->size(); |
| 842 | Swap32::writeval(pov, nsections); |
| 843 | Swap32::writeval(pov + 4, nsyms); |
| 844 | pov += 8; |
| 845 | |
| 846 | // For each input section, write the name, output section index, |
| 847 | // offset within output section, and input section size. |
| 848 | for (unsigned int i = 0; i < nsections; i++) |
| 849 | { |
| 850 | Stringpool::Key key = entry->get_input_section_name_key(i); |
| 851 | off_t name_offset = 0; |
| 852 | if (key != 0) |
| 853 | name_offset = strtab->get_offset_from_key(key); |
| 854 | int out_shndx = 0; |
| 855 | off_t out_offset = 0; |
| 856 | off_t sh_size = 0; |
| 857 | Output_section* os = obj->output_section(i); |
| 858 | if (os != NULL) |
| 859 | { |
| 860 | out_shndx = os->out_shndx(); |
| 861 | out_offset = obj->output_section_offset(i); |
| 862 | sh_size = entry->get_input_section_size(i); |
| 863 | } |
| 864 | Swap32::writeval(pov, name_offset); |
| 865 | Swap32::writeval(pov + 4, out_shndx); |
| 866 | Swap::writeval(pov + 8, out_offset); |
| 867 | Swap::writeval(pov + 8 + sizeof_addr, sh_size); |
| 868 | pov += 8 + 2 * sizeof_addr; |
| 869 | } |
| 870 | |
| 871 | // For each global symbol, write its associated relocations, |
| 872 | // add it to the linked list of globals, then write the |
| 873 | // supplemental information: global symbol table index, |
| 874 | // linked list chain pointer, relocation count, and offset |
| 875 | // to the relocations. |
| 876 | for (unsigned int i = 0; i < nsyms; i++) |
| 877 | { |
| 878 | const Symbol* sym = (*syms)[i]; |
| 879 | if (sym->is_forwarder()) |
| 880 | sym = this->symtab_->resolve_forwards(sym); |
| 881 | unsigned int symtab_index = sym->symtab_index(); |
| 882 | unsigned int chain = 0; |
| 883 | unsigned int first_reloc = 0; |
| 884 | unsigned int nrelocs = obj->get_incremental_reloc_count(i); |
| 885 | if (nrelocs > 0) |
| 886 | { |
| 887 | gold_assert(symtab_index != -1U |
| 888 | && (symtab_index - first_global_index |
| 889 | < global_sym_count)); |
| 890 | first_reloc = obj->get_incremental_reloc_base(i); |
| 891 | chain = global_syms[symtab_index - first_global_index]; |
| 892 | global_syms[symtab_index - first_global_index] = |
| 893 | pov - oview; |
| 894 | } |
| 895 | Swap32::writeval(pov, symtab_index); |
| 896 | Swap32::writeval(pov + 4, chain); |
| 897 | Swap32::writeval(pov + 8, nrelocs); |
| 898 | Swap32::writeval(pov + 12, first_reloc * 3 * sizeof_addr); |
| 899 | pov += 16; |
| 900 | } |
| 901 | } |
| 902 | break; |
| 903 | |
| 904 | case INCREMENTAL_INPUT_SHARED_LIBRARY: |
| 905 | { |
| 906 | gold_assert(static_cast<unsigned int>(pov - oview) |
| 907 | == (*p)->get_info_offset()); |
| 908 | Incremental_object_entry* entry = (*p)->object_entry(); |
| 909 | gold_assert(entry != NULL); |
| 910 | const Object* obj = entry->object(); |
| 911 | const Object::Symbols* syms = obj->get_global_symbols(); |
| 912 | |
| 913 | // Write the global symbol count. |
| 914 | unsigned int nsyms = syms != NULL ? syms->size() : 0; |
| 915 | Swap32::writeval(pov, nsyms); |
| 916 | pov += 4; |
| 917 | |
| 918 | // For each global symbol, write the global symbol table index. |
| 919 | for (unsigned int i = 0; i < nsyms; i++) |
| 920 | { |
| 921 | const Symbol* sym = (*syms)[i]; |
| 922 | Swap32::writeval(pov, sym->symtab_index()); |
| 923 | pov += 4; |
| 924 | } |
| 925 | } |
| 926 | break; |
| 927 | |
| 928 | case INCREMENTAL_INPUT_ARCHIVE: |
| 929 | { |
| 930 | gold_assert(static_cast<unsigned int>(pov - oview) |
| 931 | == (*p)->get_info_offset()); |
| 932 | Incremental_archive_entry* entry = (*p)->archive_entry(); |
| 933 | gold_assert(entry != NULL); |
| 934 | |
| 935 | // Write the member count and unused global symbol count. |
| 936 | unsigned int nmembers = entry->get_member_count(); |
| 937 | unsigned int nsyms = entry->get_unused_global_symbol_count(); |
| 938 | Swap32::writeval(pov, nmembers); |
| 939 | Swap32::writeval(pov + 4, nsyms); |
| 940 | pov += 8; |
| 941 | |
| 942 | // For each member, write the offset to its input file entry. |
| 943 | for (unsigned int i = 0; i < nmembers; ++i) |
| 944 | { |
| 945 | Incremental_object_entry* member = entry->get_member(i); |
| 946 | Swap32::writeval(pov, member->get_offset()); |
| 947 | pov += 4; |
| 948 | } |
| 949 | |
| 950 | // For each global symbol, write the name offset. |
| 951 | for (unsigned int i = 0; i < nsyms; ++i) |
| 952 | { |
| 953 | Stringpool::Key key = entry->get_unused_global_symbol(i); |
| 954 | Swap32::writeval(pov, strtab->get_offset_from_key(key)); |
| 955 | pov += 4; |
| 956 | } |
| 957 | } |
| 958 | break; |
| 959 | |
| 960 | default: |
| 961 | gold_unreachable(); |
| 962 | } |
| 963 | } |
| 964 | return pov; |
| 965 | } |
| 966 | |
| 967 | // Write the contents of the .gnu_incremental_symtab section. |
| 968 | |
| 969 | template<int size, bool big_endian> |
| 970 | void |
| 971 | Output_section_incremental_inputs<size, big_endian>::write_symtab( |
| 972 | unsigned char* pov, |
| 973 | unsigned int* global_syms, |
| 974 | unsigned int global_sym_count) |
| 975 | { |
| 976 | for (unsigned int i = 0; i < global_sym_count; ++i) |
| 977 | { |
| 978 | Swap32::writeval(pov, global_syms[i]); |
| 979 | pov += 4; |
| 980 | } |
| 981 | } |
| 982 | |
| 983 | // This struct holds the view information needed to write the |
| 984 | // .gnu_incremental_got_plt section. |
| 985 | |
| 986 | struct Got_plt_view_info |
| 987 | { |
| 988 | // Start of the GOT type array in the output view. |
| 989 | unsigned char* got_type_p; |
| 990 | // Start of the GOT descriptor array in the output view. |
| 991 | unsigned char* got_desc_p; |
| 992 | // Start of the PLT descriptor array in the output view. |
| 993 | unsigned char* plt_desc_p; |
| 994 | // Number of GOT entries. |
| 995 | unsigned int got_count; |
| 996 | // Number of PLT entries. |
| 997 | unsigned int plt_count; |
| 998 | // Offset of the first non-reserved PLT entry (this is a target-dependent value). |
| 999 | unsigned int first_plt_entry_offset; |
| 1000 | // Size of a PLT entry (this is a target-dependent value). |
| 1001 | unsigned int plt_entry_size; |
| 1002 | // Value to write in the GOT descriptor array. For global symbols, |
| 1003 | // this is the global symbol table index; for local symbols, it is |
| 1004 | // the offset of the input file entry in the .gnu_incremental_inputs |
| 1005 | // section. |
| 1006 | unsigned int got_descriptor; |
| 1007 | }; |
| 1008 | |
| 1009 | // Functor class for processing a GOT offset list for local symbols. |
| 1010 | // Writes the GOT type and symbol index into the GOT type and descriptor |
| 1011 | // arrays in the output section. |
| 1012 | |
| 1013 | template<int size, bool big_endian> |
| 1014 | class Local_got_offset_visitor |
| 1015 | { |
| 1016 | public: |
| 1017 | Local_got_offset_visitor(struct Got_plt_view_info& info) |
| 1018 | : info_(info) |
| 1019 | { } |
| 1020 | |
| 1021 | void |
| 1022 | operator()(unsigned int got_type, unsigned int got_offset) |
| 1023 | { |
| 1024 | unsigned int got_index = got_offset / this->got_entry_size_; |
| 1025 | gold_assert(got_index < this->info_.got_count); |
| 1026 | // We can only handle GOT entry types in the range 0..0x7e |
| 1027 | // because we use a byte array to store them, and we use the |
| 1028 | // high bit to flag a local symbol. |
| 1029 | gold_assert(got_type < 0x7f); |
| 1030 | this->info_.got_type_p[got_index] = got_type | 0x80; |
| 1031 | unsigned char* pov = this->info_.got_desc_p + got_index * 4; |
| 1032 | elfcpp::Swap<32, big_endian>::writeval(pov, this->info_.got_descriptor); |
| 1033 | } |
| 1034 | |
| 1035 | private: |
| 1036 | static const unsigned int got_entry_size_ = size / 8; |
| 1037 | struct Got_plt_view_info& info_; |
| 1038 | }; |
| 1039 | |
| 1040 | // Functor class for processing a GOT offset list. Writes the GOT type |
| 1041 | // and symbol index into the GOT type and descriptor arrays in the output |
| 1042 | // section. |
| 1043 | |
| 1044 | template<int size, bool big_endian> |
| 1045 | class Global_got_offset_visitor |
| 1046 | { |
| 1047 | public: |
| 1048 | Global_got_offset_visitor(struct Got_plt_view_info& info) |
| 1049 | : info_(info) |
| 1050 | { } |
| 1051 | |
| 1052 | void |
| 1053 | operator()(unsigned int got_type, unsigned int got_offset) |
| 1054 | { |
| 1055 | unsigned int got_index = got_offset / this->got_entry_size_; |
| 1056 | gold_assert(got_index < this->info_.got_count); |
| 1057 | // We can only handle GOT entry types in the range 0..0x7e |
| 1058 | // because we use a byte array to store them, and we use the |
| 1059 | // high bit to flag a local symbol. |
| 1060 | gold_assert(got_type < 0x7f); |
| 1061 | this->info_.got_type_p[got_index] = got_type; |
| 1062 | unsigned char* pov = this->info_.got_desc_p + got_index * 4; |
| 1063 | elfcpp::Swap<32, big_endian>::writeval(pov, this->info_.got_descriptor); |
| 1064 | } |
| 1065 | |
| 1066 | private: |
| 1067 | static const unsigned int got_entry_size_ = size / 8; |
| 1068 | struct Got_plt_view_info& info_; |
| 1069 | }; |
| 1070 | |
| 1071 | // Functor class for processing the global symbol table. Processes the |
| 1072 | // GOT offset list for the symbol, and writes the symbol table index |
| 1073 | // into the PLT descriptor array in the output section. |
| 1074 | |
| 1075 | template<int size, bool big_endian> |
| 1076 | class Global_symbol_visitor_got_plt |
| 1077 | { |
| 1078 | public: |
| 1079 | Global_symbol_visitor_got_plt(struct Got_plt_view_info& info) |
| 1080 | : info_(info) |
| 1081 | { } |
| 1082 | |
| 1083 | void |
| 1084 | operator()(const Sized_symbol<size>* sym) |
| 1085 | { |
| 1086 | typedef Global_got_offset_visitor<size, big_endian> Got_visitor; |
| 1087 | const Got_offset_list* got_offsets = sym->got_offset_list(); |
| 1088 | if (got_offsets != NULL) |
| 1089 | { |
| 1090 | info_.got_descriptor = sym->symtab_index(); |
| 1091 | got_offsets->for_all_got_offsets(Got_visitor(info_)); |
| 1092 | } |
| 1093 | if (sym->has_plt_offset()) |
| 1094 | { |
| 1095 | unsigned int plt_index = |
| 1096 | ((sym->plt_offset() - this->info_.first_plt_entry_offset) |
| 1097 | / this->info_.plt_entry_size); |
| 1098 | gold_assert(plt_index < this->info_.plt_count); |
| 1099 | unsigned char* pov = this->info_.plt_desc_p + plt_index * 4; |
| 1100 | elfcpp::Swap<32, big_endian>::writeval(pov, sym->symtab_index()); |
| 1101 | } |
| 1102 | } |
| 1103 | |
| 1104 | private: |
| 1105 | struct Got_plt_view_info& info_; |
| 1106 | }; |
| 1107 | |
| 1108 | // Write the contents of the .gnu_incremental_got_plt section. |
| 1109 | |
| 1110 | template<int size, bool big_endian> |
| 1111 | void |
| 1112 | Output_section_incremental_inputs<size, big_endian>::write_got_plt( |
| 1113 | unsigned char* pov, |
| 1114 | off_t view_size) |
| 1115 | { |
| 1116 | Sized_target<size, big_endian>* target = |
| 1117 | parameters->sized_target<size, big_endian>(); |
| 1118 | |
| 1119 | // Set up the view information for the functors. |
| 1120 | struct Got_plt_view_info view_info; |
| 1121 | view_info.got_count = target->got_entry_count(); |
| 1122 | view_info.plt_count = target->plt_entry_count(); |
| 1123 | view_info.first_plt_entry_offset = target->first_plt_entry_offset(); |
| 1124 | view_info.plt_entry_size = target->plt_entry_size(); |
| 1125 | view_info.got_type_p = pov + 8; |
| 1126 | view_info.got_desc_p = (view_info.got_type_p |
| 1127 | + ((view_info.got_count + 3) & ~3)); |
| 1128 | view_info.plt_desc_p = view_info.got_desc_p + view_info.got_count * 4; |
| 1129 | |
| 1130 | gold_assert(pov + view_size == |
| 1131 | view_info.plt_desc_p + view_info.plt_count * 4); |
| 1132 | |
| 1133 | // Write the section header. |
| 1134 | Swap32::writeval(pov, view_info.got_count); |
| 1135 | Swap32::writeval(pov + 4, view_info.plt_count); |
| 1136 | |
| 1137 | // Initialize the GOT type array to 0xff (reserved). |
| 1138 | memset(view_info.got_type_p, 0xff, view_info.got_count); |
| 1139 | |
| 1140 | // Write the incremental GOT descriptors for local symbols. |
| 1141 | for (Incremental_inputs::Input_list::const_iterator p = |
| 1142 | this->inputs_->input_files().begin(); |
| 1143 | p != this->inputs_->input_files().end(); |
| 1144 | ++p) |
| 1145 | { |
| 1146 | if ((*p)->type() != INCREMENTAL_INPUT_OBJECT |
| 1147 | && (*p)->type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER) |
| 1148 | continue; |
| 1149 | Incremental_object_entry* entry = (*p)->object_entry(); |
| 1150 | gold_assert(entry != NULL); |
| 1151 | const Sized_relobj<size, big_endian>* obj = |
| 1152 | static_cast<Sized_relobj<size, big_endian>*>(entry->object()); |
| 1153 | gold_assert(obj != NULL); |
| 1154 | unsigned int nsyms = obj->local_symbol_count(); |
| 1155 | for (unsigned int i = 0; i < nsyms; i++) |
| 1156 | { |
| 1157 | const Got_offset_list* got_offsets = obj->local_got_offset_list(i); |
| 1158 | if (got_offsets != NULL) |
| 1159 | { |
| 1160 | typedef Local_got_offset_visitor<size, big_endian> Got_visitor; |
| 1161 | view_info.got_descriptor = (*p)->get_offset(); |
| 1162 | got_offsets->for_all_got_offsets(Got_visitor(view_info)); |
| 1163 | } |
| 1164 | } |
| 1165 | } |
| 1166 | |
| 1167 | // Write the incremental GOT and PLT descriptors for global symbols. |
| 1168 | typedef Global_symbol_visitor_got_plt<size, big_endian> Symbol_visitor; |
| 1169 | symtab_->for_all_symbols<size, Symbol_visitor>(Symbol_visitor(view_info)); |
| 1170 | } |
| 1171 | |
| 1172 | // Instantiate the templates we need. |
| 1173 | |
| 1174 | #ifdef HAVE_TARGET_32_LITTLE |
| 1175 | template |
| 1176 | class Sized_incremental_binary<32, false>; |
| 1177 | #endif |
| 1178 | |
| 1179 | #ifdef HAVE_TARGET_32_BIG |
| 1180 | template |
| 1181 | class Sized_incremental_binary<32, true>; |
| 1182 | #endif |
| 1183 | |
| 1184 | #ifdef HAVE_TARGET_64_LITTLE |
| 1185 | template |
| 1186 | class Sized_incremental_binary<64, false>; |
| 1187 | #endif |
| 1188 | |
| 1189 | #ifdef HAVE_TARGET_64_BIG |
| 1190 | template |
| 1191 | class Sized_incremental_binary<64, true>; |
| 1192 | #endif |
| 1193 | |
| 1194 | } // End namespace gold. |