1 // inremental.cc -- incremental linking support for gold
3 // Copyright 2009, 2010 Free Software Foundation, Inc.
4 // Written by Mikolaj Zalewski <mikolajz@google.com>.
6 // This file is part of gold.
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.
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.
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.
26 #include "libiberty.h"
31 #include "incremental.h"
34 #include "target-select.h"
38 // Version information. Will change frequently during the development, later
39 // we could think about backward (and forward?) compatibility.
40 const unsigned int INCREMENTAL_LINK_VERSION = 1;
42 // This class manages the .gnu_incremental_inputs section, which holds
43 // the header information, a directory of input files, and separate
44 // entries for each input file.
46 template<int size, bool big_endian>
47 class Output_section_incremental_inputs : public Output_section_data
50 Output_section_incremental_inputs(const Incremental_inputs* inputs,
51 const Symbol_table* symtab)
52 : Output_section_data(size / 8), inputs_(inputs), symtab_(symtab)
56 // Set the final data size.
58 set_final_data_size();
60 // Write the data to the file.
62 do_write(Output_file*);
64 // Write to a map file.
66 do_print_to_mapfile(Mapfile* mapfile) const
67 { mapfile->print_output_data(this, _("** incremental_inputs")); }
70 // Write the section header.
72 write_header(unsigned char* pov, unsigned int input_file_count,
73 section_offset_type command_line_offset);
75 // Write the input file entries.
77 write_input_files(unsigned char* oview, unsigned char* pov,
80 // Write the supplemental information blocks.
82 write_info_blocks(unsigned char* oview, unsigned char* pov,
83 Stringpool* strtab, unsigned int* global_syms,
84 unsigned int global_sym_count);
86 // Write the contents of the .gnu_incremental_symtab section.
88 write_symtab(unsigned char* pov, unsigned int* global_syms,
89 unsigned int global_sym_count);
91 // Typedefs for writing the data to the output sections.
92 typedef elfcpp::Swap<size, big_endian> Swap;
93 typedef elfcpp::Swap<16, big_endian> Swap16;
94 typedef elfcpp::Swap<32, big_endian> Swap32;
95 typedef elfcpp::Swap<64, big_endian> Swap64;
97 // Sizes of various structures.
98 static const int sizeof_addr = size / 8;
99 static const int header_size = 16;
100 static const int input_entry_size = 24;
102 // The Incremental_inputs object.
103 const Incremental_inputs* inputs_;
106 const Symbol_table* symtab_;
109 // Inform the user why we don't do an incremental link. Not called in
110 // the obvious case of missing output file. TODO: Is this helpful?
113 vexplain_no_incremental(const char* format, va_list args)
116 if (vasprintf(&buf, format, args) < 0)
118 gold_info(_("the link might take longer: "
119 "cannot perform incremental link: %s"), buf);
124 explain_no_incremental(const char* format, ...)
127 va_start(args, format);
128 vexplain_no_incremental(format, args);
135 Incremental_binary::error(const char* format, ...) const
138 va_start(args, format);
139 // Current code only checks if the file can be used for incremental linking,
140 // so errors shouldn't fail the build, but only result in a fallback to a
142 // TODO: when we implement incremental editing of the file, we may need a
143 // flag that will cause errors to be treated seriously.
144 vexplain_no_incremental(format, args);
148 // Find the .gnu_incremental_inputs section and related sections.
150 template<int size, bool big_endian>
152 Sized_incremental_binary<size, big_endian>::do_find_incremental_inputs_sections(
153 unsigned int* p_inputs_shndx,
154 unsigned int* p_symtab_shndx,
155 unsigned int* p_relocs_shndx,
156 unsigned int* p_strtab_shndx)
158 unsigned int inputs_shndx =
159 this->elf_file_.find_section_by_type(elfcpp::SHT_GNU_INCREMENTAL_INPUTS);
160 if (inputs_shndx == elfcpp::SHN_UNDEF) // Not found.
163 unsigned int symtab_shndx =
164 this->elf_file_.find_section_by_type(elfcpp::SHT_GNU_INCREMENTAL_SYMTAB);
165 if (symtab_shndx == elfcpp::SHN_UNDEF) // Not found.
167 if (this->elf_file_.section_link(symtab_shndx) != inputs_shndx)
170 unsigned int relocs_shndx =
171 this->elf_file_.find_section_by_type(elfcpp::SHT_GNU_INCREMENTAL_RELOCS);
172 if (relocs_shndx == elfcpp::SHN_UNDEF) // Not found.
174 if (this->elf_file_.section_link(relocs_shndx) != inputs_shndx)
177 unsigned int strtab_shndx = this->elf_file_.section_link(inputs_shndx);
178 if (strtab_shndx == elfcpp::SHN_UNDEF
179 || strtab_shndx > this->elf_file_.shnum()
180 || this->elf_file_.section_type(strtab_shndx) != elfcpp::SHT_STRTAB)
183 if (p_inputs_shndx != NULL)
184 *p_inputs_shndx = inputs_shndx;
185 if (p_symtab_shndx != NULL)
186 *p_symtab_shndx = symtab_shndx;
187 if (p_relocs_shndx != NULL)
188 *p_relocs_shndx = relocs_shndx;
189 if (p_strtab_shndx != NULL)
190 *p_strtab_shndx = strtab_shndx;
194 // Determine whether an incremental link based on the existing output file
197 template<int size, bool big_endian>
199 Sized_incremental_binary<size, big_endian>::do_check_inputs(
200 Incremental_inputs* incremental_inputs)
202 unsigned int inputs_shndx;
203 unsigned int symtab_shndx;
204 unsigned int relocs_shndx;
205 unsigned int strtab_shndx;
207 if (!do_find_incremental_inputs_sections(&inputs_shndx, &symtab_shndx,
208 &relocs_shndx, &strtab_shndx))
210 explain_no_incremental(_("no incremental data from previous build"));
214 Location inputs_location(this->elf_file_.section_contents(inputs_shndx));
215 Location symtab_location(this->elf_file_.section_contents(symtab_shndx));
216 Location relocs_location(this->elf_file_.section_contents(relocs_shndx));
217 Location strtab_location(this->elf_file_.section_contents(strtab_shndx));
219 View inputs_view(view(inputs_location));
220 View symtab_view(view(symtab_location));
221 View relocs_view(view(relocs_location));
222 View strtab_view(view(strtab_location));
224 elfcpp::Elf_strtab strtab(strtab_view.data(), strtab_location.data_size);
226 Incremental_inputs_reader<size, big_endian>
227 incoming_inputs(inputs_view.data(), strtab);
229 if (incoming_inputs.version() != INCREMENTAL_LINK_VERSION)
231 explain_no_incremental(_("different version of incremental build data"));
235 if (incremental_inputs->command_line() != incoming_inputs.command_line())
237 explain_no_incremental(_("command line changed"));
241 // TODO: compare incremental_inputs->inputs() with entries in data_view.
249 // Create a Sized_incremental_binary object of the specified size and
250 // endianness. Fails if the target architecture is not supported.
252 template<int size, bool big_endian>
254 make_sized_incremental_binary(Output_file* file,
255 const elfcpp::Ehdr<size, big_endian>& ehdr)
257 Target* target = select_target(ehdr.get_e_machine(), size, big_endian,
258 ehdr.get_e_ident()[elfcpp::EI_OSABI],
259 ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]);
262 explain_no_incremental(_("unsupported ELF machine number %d"),
263 ehdr.get_e_machine());
267 if (!parameters->target_valid())
268 set_parameters_target(target);
269 else if (target != ¶meters->target())
270 gold_error(_("%s: incompatible target"), file->filename());
272 return new Sized_incremental_binary<size, big_endian>(file, ehdr, target);
275 } // End of anonymous namespace.
277 // Create an Incremental_binary object for FILE. Returns NULL is this is not
278 // possible, e.g. FILE is not an ELF file or has an unsupported target. FILE
282 open_incremental_binary(Output_file* file)
284 off_t filesize = file->filesize();
285 int want = elfcpp::Elf_recognizer::max_header_size;
289 const unsigned char* p = file->get_input_view(0, want);
290 if (!elfcpp::Elf_recognizer::is_elf_file(p, want))
292 explain_no_incremental(_("output is not an ELF file."));
297 bool big_endian = false;
299 if (!elfcpp::Elf_recognizer::is_valid_header(p, want, &size, &big_endian,
302 explain_no_incremental(error.c_str());
306 Incremental_binary* result = NULL;
311 #ifdef HAVE_TARGET_32_BIG
312 result = make_sized_incremental_binary<32, true>(
313 file, elfcpp::Ehdr<32, true>(p));
315 explain_no_incremental(_("unsupported file: 32-bit, big-endian"));
320 #ifdef HAVE_TARGET_32_LITTLE
321 result = make_sized_incremental_binary<32, false>(
322 file, elfcpp::Ehdr<32, false>(p));
324 explain_no_incremental(_("unsupported file: 32-bit, little-endian"));
332 #ifdef HAVE_TARGET_64_BIG
333 result = make_sized_incremental_binary<64, true>(
334 file, elfcpp::Ehdr<64, true>(p));
336 explain_no_incremental(_("unsupported file: 64-bit, big-endian"));
341 #ifdef HAVE_TARGET_64_LITTLE
342 result = make_sized_incremental_binary<64, false>(
343 file, elfcpp::Ehdr<64, false>(p));
345 explain_no_incremental(_("unsupported file: 64-bit, little-endian"));
355 // Analyzes the output file to check if incremental linking is possible and
356 // (to be done) what files need to be relinked.
359 Incremental_checker::can_incrementally_link_output_file()
361 Output_file output(this->output_name_);
362 if (!output.open_for_modification())
364 Incremental_binary* binary = open_incremental_binary(&output);
367 return binary->check_inputs(this->incremental_inputs_);
370 // Class Incremental_inputs.
372 // Add the command line to the string table, setting
373 // command_line_key_. In incremental builds, the command line is
374 // stored in .gnu_incremental_inputs so that the next linker run can
375 // check if the command line options didn't change.
378 Incremental_inputs::report_command_line(int argc, const char* const* argv)
380 // Always store 'gold' as argv[0] to avoid a full relink if the user used a
381 // different path to the linker.
382 std::string args("gold");
383 // Copied from collect_argv in main.cc.
384 for (int i = 1; i < argc; ++i)
386 // Adding/removing these options should not result in a full relink.
387 if (strcmp(argv[i], "--incremental-changed") == 0
388 || strcmp(argv[i], "--incremental-unchanged") == 0
389 || strcmp(argv[i], "--incremental-unknown") == 0)
393 // Now append argv[i], but with all single-quotes escaped
394 const char* argpos = argv[i];
397 const int len = strcspn(argpos, "'");
398 args.append(argpos, len);
399 if (argpos[len] == '\0')
401 args.append("'\"'\"'");
407 this->command_line_ = args;
408 this->strtab_->add(this->command_line_.c_str(), false,
409 &this->command_line_key_);
412 // Record the input archive file ARCHIVE. This is called by the
413 // Add_archive_symbols task before determining which archive members
414 // to include. We create the Incremental_archive_entry here and
415 // attach it to the Archive, but we do not add it to the list of
416 // input objects until report_archive_end is called.
419 Incremental_inputs::report_archive_begin(Archive* arch)
421 Stringpool::Key filename_key;
422 Timespec mtime = arch->file().get_mtime();
424 this->strtab_->add(arch->filename().c_str(), false, &filename_key);
425 Incremental_archive_entry* entry =
426 new Incremental_archive_entry(filename_key, arch, mtime);
427 arch->set_incremental_info(entry);
430 // Finish recording the input archive file ARCHIVE. This is called by the
431 // Add_archive_symbols task after determining which archive members
435 Incremental_inputs::report_archive_end(Archive* arch)
437 Incremental_archive_entry* entry = arch->incremental_info();
439 gold_assert(entry != NULL);
441 // Collect unused global symbols.
442 for (Archive::Unused_symbol_iterator p = arch->unused_symbols_begin();
443 p != arch->unused_symbols_end();
446 Stringpool::Key symbol_key;
447 this->strtab_->add(*p, true, &symbol_key);
448 entry->add_unused_global_symbol(symbol_key);
450 this->inputs_.push_back(entry);
453 // Record the input object file OBJ. If ARCH is not NULL, attach
454 // the object file to the archive. This is called by the
455 // Add_symbols task after finding out the type of the file.
458 Incremental_inputs::report_object(Object* obj, Archive* arch)
460 Stringpool::Key filename_key;
461 Timespec mtime = obj->input_file()->file().get_mtime();
463 this->strtab_->add(obj->name().c_str(), false, &filename_key);
464 Incremental_object_entry* obj_entry =
465 new Incremental_object_entry(filename_key, obj, mtime);
466 this->inputs_.push_back(obj_entry);
470 Incremental_archive_entry* arch_entry = arch->incremental_info();
471 gold_assert(arch_entry != NULL);
472 arch_entry->add_object(obj_entry);
475 this->current_object_ = obj;
476 this->current_object_entry_ = obj_entry;
479 // Record the input object file OBJ. If ARCH is not NULL, attach
480 // the object file to the archive. This is called by the
481 // Add_symbols task after finding out the type of the file.
484 Incremental_inputs::report_input_section(Object* obj, unsigned int shndx,
485 const char* name, off_t sh_size)
487 Stringpool::Key key = 0;
490 this->strtab_->add(name, true, &key);
492 gold_assert(obj == this->current_object_);
493 this->current_object_entry_->add_input_section(shndx, key, sh_size);
496 // Record that the input argument INPUT is a script SCRIPT. This is
497 // called by read_script after parsing the script and reading the list
498 // of inputs added by this script.
501 Incremental_inputs::report_script(const std::string& filename,
502 Script_info* script, Timespec mtime)
504 Stringpool::Key filename_key;
506 this->strtab_->add(filename.c_str(), false, &filename_key);
507 Incremental_script_entry* entry =
508 new Incremental_script_entry(filename_key, script, mtime);
509 this->inputs_.push_back(entry);
512 // Finalize the incremental link information. Called from
516 Incremental_inputs::finalize()
518 // Finalize the string table.
519 this->strtab_->set_string_offsets();
522 // Create the .gnu_incremental_inputs, _symtab, and _relocs input sections.
525 Incremental_inputs::create_data_sections(Symbol_table* symtab)
527 switch (parameters->size_and_endianness())
529 #ifdef HAVE_TARGET_32_LITTLE
530 case Parameters::TARGET_32_LITTLE:
531 this->inputs_section_ =
532 new Output_section_incremental_inputs<32, false>(this, symtab);
535 #ifdef HAVE_TARGET_32_BIG
536 case Parameters::TARGET_32_BIG:
537 this->inputs_section_ =
538 new Output_section_incremental_inputs<32, true>(this, symtab);
541 #ifdef HAVE_TARGET_64_LITTLE
542 case Parameters::TARGET_64_LITTLE:
543 this->inputs_section_ =
544 new Output_section_incremental_inputs<64, false>(this, symtab);
547 #ifdef HAVE_TARGET_64_BIG
548 case Parameters::TARGET_64_BIG:
549 this->inputs_section_ =
550 new Output_section_incremental_inputs<64, true>(this, symtab);
556 this->symtab_section_ = new Output_data_space(4, "** incremental_symtab");
557 this->relocs_section_ = new Output_data_space(4, "** incremental_relocs");
560 // Return the sh_entsize value for the .gnu_incremental_relocs section.
562 Incremental_inputs::relocs_entsize() const
564 return 8 + 2 * parameters->target().get_size() / 8;
567 // Class Output_section_incremental_inputs.
569 // Finalize the offsets for each input section and supplemental info block,
570 // and set the final data size of the incremental output sections.
572 template<int size, bool big_endian>
574 Output_section_incremental_inputs<size, big_endian>::set_final_data_size()
576 const Incremental_inputs* inputs = this->inputs_;
577 const unsigned int sizeof_addr = size / 8;
578 const unsigned int rel_size = 8 + 2 * sizeof_addr;
580 // Offset of each input entry.
581 unsigned int input_offset = this->header_size;
583 // Offset of each supplemental info block.
584 unsigned int info_offset = this->header_size;
585 info_offset += this->input_entry_size * inputs->input_file_count();
587 // Count each input file and its supplemental information block.
588 for (Incremental_inputs::Input_list::const_iterator p =
589 inputs->input_files().begin();
590 p != inputs->input_files().end();
593 // Set the offset of the input file entry.
594 (*p)->set_offset(input_offset);
595 input_offset += this->input_entry_size;
597 // Set the offset of the supplemental info block.
598 switch ((*p)->type())
600 case INCREMENTAL_INPUT_SCRIPT:
601 // No supplemental info for a script.
602 (*p)->set_info_offset(0);
604 case INCREMENTAL_INPUT_OBJECT:
605 case INCREMENTAL_INPUT_ARCHIVE_MEMBER:
607 Incremental_object_entry *entry = (*p)->object_entry();
608 gold_assert(entry != NULL);
609 (*p)->set_info_offset(info_offset);
610 // Input section count + global symbol count.
612 // Each input section.
613 info_offset += (entry->get_input_section_count()
614 * (8 + 2 * sizeof_addr));
615 // Each global symbol.
616 const Object::Symbols* syms = entry->object()->get_global_symbols();
617 info_offset += syms->size() * 16;
620 case INCREMENTAL_INPUT_SHARED_LIBRARY:
622 Incremental_object_entry *entry = (*p)->object_entry();
623 gold_assert(entry != NULL);
624 (*p)->set_info_offset(info_offset);
625 // Global symbol count.
627 // Each global symbol.
628 const Object::Symbols* syms = entry->object()->get_global_symbols();
629 unsigned int nsyms = syms != NULL ? syms->size() : 0;
630 info_offset += nsyms * 4;
633 case INCREMENTAL_INPUT_ARCHIVE:
635 Incremental_archive_entry *entry = (*p)->archive_entry();
636 gold_assert(entry != NULL);
637 (*p)->set_info_offset(info_offset);
638 // Member count + unused global symbol count.
641 info_offset += (entry->get_member_count() * 4);
642 // Each global symbol.
643 info_offset += (entry->get_unused_global_symbol_count() * 4);
651 this->set_data_size(info_offset);
653 // Set the size of the .gnu_incremental_symtab section.
654 inputs->symtab_section()->set_current_data_size(this->symtab_->output_count()
655 * sizeof(unsigned int));
657 // Set the size of the .gnu_incremental_relocs section.
658 inputs->relocs_section()->set_current_data_size(inputs->get_reloc_count()
662 // Write the contents of the .gnu_incremental_inputs and
663 // .gnu_incremental_symtab sections.
665 template<int size, bool big_endian>
667 Output_section_incremental_inputs<size, big_endian>::do_write(Output_file* of)
669 const Incremental_inputs* inputs = this->inputs_;
670 Stringpool* strtab = inputs->get_stringpool();
672 // Get a view into the .gnu_incremental_inputs section.
673 const off_t off = this->offset();
674 const off_t oview_size = this->data_size();
675 unsigned char* const oview = of->get_output_view(off, oview_size);
676 unsigned char* pov = oview;
678 // Get a view into the .gnu_incremental_symtab section.
679 const off_t symtab_off = inputs->symtab_section()->offset();
680 const off_t symtab_size = inputs->symtab_section()->data_size();
681 unsigned char* const symtab_view = of->get_output_view(symtab_off,
684 // Allocate an array of linked list heads for the .gnu_incremental_symtab
685 // section. Each element corresponds to a global symbol in the output
686 // symbol table, and points to the head of the linked list that threads
687 // through the object file input entries. The value of each element
688 // is the section-relative offset to a global symbol entry in a
689 // supplemental information block.
690 unsigned int global_sym_count = this->symtab_->output_count();
691 unsigned int* global_syms = new unsigned int[global_sym_count];
692 memset(global_syms, 0, global_sym_count * sizeof(unsigned int));
694 // Write the section header.
695 Stringpool::Key command_line_key = inputs->command_line_key();
696 pov = this->write_header(pov, inputs->input_file_count(),
697 strtab->get_offset_from_key(command_line_key));
699 // Write the list of input files.
700 pov = this->write_input_files(oview, pov, strtab);
702 // Write the supplemental information blocks for each input file.
703 pov = this->write_info_blocks(oview, pov, strtab, global_syms,
706 gold_assert(pov - oview == oview_size);
708 // Write the .gnu_incremental_symtab section.
709 gold_assert(global_sym_count * 4 == symtab_size);
710 this->write_symtab(symtab_view, global_syms, global_sym_count);
712 delete[] global_syms;
714 of->write_output_view(off, oview_size, oview);
715 of->write_output_view(symtab_off, symtab_size, symtab_view);
718 // Write the section header: version, input file count, offset of command line
719 // in the string table, and 4 bytes of padding.
721 template<int size, bool big_endian>
723 Output_section_incremental_inputs<size, big_endian>::write_header(
725 unsigned int input_file_count,
726 section_offset_type command_line_offset)
728 Swap32::writeval(pov, INCREMENTAL_LINK_VERSION);
729 Swap32::writeval(pov + 4, input_file_count);
730 Swap32::writeval(pov + 8, command_line_offset);
731 Swap32::writeval(pov + 12, 0);
732 return pov + this->header_size;
735 // Write the input file entries.
737 template<int size, bool big_endian>
739 Output_section_incremental_inputs<size, big_endian>::write_input_files(
740 unsigned char* oview,
744 const Incremental_inputs* inputs = this->inputs_;
746 for (Incremental_inputs::Input_list::const_iterator p =
747 inputs->input_files().begin();
748 p != inputs->input_files().end();
751 gold_assert(pov - oview == (*p)->get_offset());
752 section_offset_type filename_offset =
753 strtab->get_offset_from_key((*p)->get_filename_key());
754 const Timespec& mtime = (*p)->get_mtime();
755 Swap32::writeval(pov, filename_offset);
756 Swap32::writeval(pov + 4, (*p)->get_info_offset());
757 Swap64::writeval(pov + 8, mtime.seconds);
758 Swap32::writeval(pov + 16, mtime.nanoseconds);
759 Swap16::writeval(pov + 20, (*p)->type());
760 Swap16::writeval(pov + 22, 0);
761 pov += this->input_entry_size;
766 // Write the supplemental information blocks.
768 template<int size, bool big_endian>
770 Output_section_incremental_inputs<size, big_endian>::write_info_blocks(
771 unsigned char* oview,
774 unsigned int* global_syms,
775 unsigned int global_sym_count)
777 const Incremental_inputs* inputs = this->inputs_;
778 unsigned int first_global_index = this->symtab_->first_global_index();
780 for (Incremental_inputs::Input_list::const_iterator p =
781 inputs->input_files().begin();
782 p != inputs->input_files().end();
785 switch ((*p)->type())
787 case INCREMENTAL_INPUT_SCRIPT:
788 // No supplemental info for a script.
791 case INCREMENTAL_INPUT_OBJECT:
792 case INCREMENTAL_INPUT_ARCHIVE_MEMBER:
794 gold_assert(pov - oview == (*p)->get_info_offset());
795 Incremental_object_entry* entry = (*p)->object_entry();
796 gold_assert(entry != NULL);
797 const Object* obj = entry->object();
798 const Object::Symbols* syms = obj->get_global_symbols();
799 // Write the input section count and global symbol count.
800 unsigned int nsections = entry->get_input_section_count();
801 unsigned int nsyms = syms->size();
802 Swap32::writeval(pov, nsections);
803 Swap32::writeval(pov + 4, nsyms);
806 // For each input section, write the name, output section index,
807 // offset within output section, and input section size.
808 for (unsigned int i = 0; i < nsections; i++)
810 Stringpool::Key key = entry->get_input_section_name_key(i);
811 off_t name_offset = 0;
813 name_offset = strtab->get_offset_from_key(key);
815 off_t out_offset = 0;
817 Output_section* os = obj->output_section(i);
820 out_shndx = os->out_shndx();
821 out_offset = obj->output_section_offset(i);
822 sh_size = entry->get_input_section_size(i);
824 Swap32::writeval(pov, name_offset);
825 Swap32::writeval(pov + 4, out_shndx);
826 Swap::writeval(pov + 8, out_offset);
827 Swap::writeval(pov + 8 + sizeof_addr, sh_size);
828 pov += 8 + 2 * sizeof_addr;
831 // For each global symbol, write its associated relocations,
832 // add it to the linked list of globals, then write the
833 // supplemental information: global symbol table index,
834 // linked list chain pointer, relocation count, and offset
835 // to the relocations.
836 for (unsigned int i = 0; i < nsyms; i++)
838 const Symbol* sym = (*syms)[i];
839 unsigned int symtab_index = sym->symtab_index();
840 unsigned int chain = 0;
841 unsigned int first_reloc = 0;
842 unsigned int nrelocs = obj->get_incremental_reloc_count(i);
845 gold_assert(symtab_index != -1U
846 && (symtab_index - first_global_index
847 < global_sym_count));
848 first_reloc = obj->get_incremental_reloc_base(i);
849 chain = global_syms[symtab_index - first_global_index];
850 global_syms[symtab_index - first_global_index] =
853 Swap32::writeval(pov, symtab_index);
854 Swap32::writeval(pov + 4, chain);
855 Swap32::writeval(pov + 8, nrelocs);
856 Swap32::writeval(pov + 12, first_reloc * 3 * sizeof_addr);
862 case INCREMENTAL_INPUT_SHARED_LIBRARY:
864 gold_assert(pov - oview == (*p)->get_info_offset());
865 Incremental_object_entry* entry = (*p)->object_entry();
866 gold_assert(entry != NULL);
867 const Object* obj = entry->object();
868 const Object::Symbols* syms = obj->get_global_symbols();
870 // Write the global symbol count.
871 unsigned int nsyms = syms != NULL ? syms->size() : 0;
872 Swap32::writeval(pov, nsyms);
875 // For each global symbol, write the global symbol table index.
876 for (unsigned int i = 0; i < nsyms; i++)
878 const Symbol* sym = (*syms)[i];
879 Swap32::writeval(pov, sym->symtab_index());
885 case INCREMENTAL_INPUT_ARCHIVE:
887 gold_assert(pov - oview == (*p)->get_info_offset());
888 Incremental_archive_entry* entry = (*p)->archive_entry();
889 gold_assert(entry != NULL);
891 // Write the member count and unused global symbol count.
892 unsigned int nmembers = entry->get_member_count();
893 unsigned int nsyms = entry->get_unused_global_symbol_count();
894 Swap32::writeval(pov, nmembers);
895 Swap32::writeval(pov + 4, nsyms);
898 // For each member, write the offset to its input file entry.
899 for (unsigned int i = 0; i < nmembers; ++i)
901 Incremental_object_entry* member = entry->get_member(i);
902 Swap32::writeval(pov, member->get_offset());
906 // For each global symbol, write the name offset.
907 for (unsigned int i = 0; i < nsyms; ++i)
909 Stringpool::Key key = entry->get_unused_global_symbol(i);
910 Swap32::writeval(pov, strtab->get_offset_from_key(key));
923 // Write the contents of the .gnu_incremental_symtab section.
925 template<int size, bool big_endian>
927 Output_section_incremental_inputs<size, big_endian>::write_symtab(
929 unsigned int* global_syms,
930 unsigned int global_sym_count)
932 for (unsigned int i = 0; i < global_sym_count; ++i)
934 Swap32::writeval(pov, global_syms[i]);
939 // Instantiate the templates we need.
941 #ifdef HAVE_TARGET_32_LITTLE
943 class Sized_incremental_binary<32, false>;
946 #ifdef HAVE_TARGET_32_BIG
948 class Sized_incremental_binary<32, true>;
951 #ifdef HAVE_TARGET_64_LITTLE
953 class Sized_incremental_binary<64, false>;
956 #ifdef HAVE_TARGET_64_BIG
958 class Sized_incremental_binary<64, true>;
961 } // End namespace gold.