1 // object.cc -- support for an object file for linking in gold
3 // Copyright (C) 2006-2018 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@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.
29 #include "libiberty.h"
32 #include "target-select.h"
33 #include "dwarf_reader.h"
42 #include "compressed_output.h"
43 #include "incremental.h"
49 // Struct Read_symbols_data.
51 // Destroy any remaining File_view objects and buffers of decompressed
54 Read_symbols_data::~Read_symbols_data()
56 if (this->section_headers != NULL)
57 delete this->section_headers;
58 if (this->section_names != NULL)
59 delete this->section_names;
60 if (this->symbols != NULL)
62 if (this->symbol_names != NULL)
63 delete this->symbol_names;
64 if (this->versym != NULL)
66 if (this->verdef != NULL)
68 if (this->verneed != NULL)
74 // Initialize the symtab_xindex_ array. Find the SHT_SYMTAB_SHNDX
75 // section and read it in. SYMTAB_SHNDX is the index of the symbol
76 // table we care about.
78 template<int size, bool big_endian>
80 Xindex::initialize_symtab_xindex(Object* object, unsigned int symtab_shndx)
82 if (!this->symtab_xindex_.empty())
85 gold_assert(symtab_shndx != 0);
87 // Look through the sections in reverse order, on the theory that it
88 // is more likely to be near the end than the beginning.
89 unsigned int i = object->shnum();
93 if (object->section_type(i) == elfcpp::SHT_SYMTAB_SHNDX
94 && this->adjust_shndx(object->section_link(i)) == symtab_shndx)
96 this->read_symtab_xindex<size, big_endian>(object, i, NULL);
101 object->error(_("missing SHT_SYMTAB_SHNDX section"));
104 // Read in the symtab_xindex_ array, given the section index of the
105 // SHT_SYMTAB_SHNDX section. If PSHDRS is not NULL, it points at the
108 template<int size, bool big_endian>
110 Xindex::read_symtab_xindex(Object* object, unsigned int xindex_shndx,
111 const unsigned char* pshdrs)
113 section_size_type bytecount;
114 const unsigned char* contents;
116 contents = object->section_contents(xindex_shndx, &bytecount, false);
119 const unsigned char* p = (pshdrs
121 * elfcpp::Elf_sizes<size>::shdr_size));
122 typename elfcpp::Shdr<size, big_endian> shdr(p);
123 bytecount = convert_to_section_size_type(shdr.get_sh_size());
124 contents = object->get_view(shdr.get_sh_offset(), bytecount, true, false);
127 gold_assert(this->symtab_xindex_.empty());
128 this->symtab_xindex_.reserve(bytecount / 4);
129 for (section_size_type i = 0; i < bytecount; i += 4)
131 unsigned int shndx = elfcpp::Swap<32, big_endian>::readval(contents + i);
132 // We preadjust the section indexes we save.
133 this->symtab_xindex_.push_back(this->adjust_shndx(shndx));
137 // Symbol symndx has a section of SHN_XINDEX; return the real section
141 Xindex::sym_xindex_to_shndx(Object* object, unsigned int symndx)
143 if (symndx >= this->symtab_xindex_.size())
145 object->error(_("symbol %u out of range for SHT_SYMTAB_SHNDX section"),
147 return elfcpp::SHN_UNDEF;
149 unsigned int shndx = this->symtab_xindex_[symndx];
150 if (shndx < elfcpp::SHN_LORESERVE || shndx >= object->shnum())
152 object->error(_("extended index for symbol %u out of range: %u"),
154 return elfcpp::SHN_UNDEF;
161 // Report an error for this object file. This is used by the
162 // elfcpp::Elf_file interface, and also called by the Object code
166 Object::error(const char* format, ...) const
169 va_start(args, format);
171 if (vasprintf(&buf, format, args) < 0)
174 gold_error(_("%s: %s"), this->name().c_str(), buf);
178 // Return a view of the contents of a section.
181 Object::section_contents(unsigned int shndx, section_size_type* plen,
183 { return this->do_section_contents(shndx, plen, cache); }
185 // Read the section data into SD. This is code common to Sized_relobj_file
186 // and Sized_dynobj, so we put it into Object.
188 template<int size, bool big_endian>
190 Object::read_section_data(elfcpp::Elf_file<size, big_endian, Object>* elf_file,
191 Read_symbols_data* sd)
193 const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
195 // Read the section headers.
196 const off_t shoff = elf_file->shoff();
197 const unsigned int shnum = this->shnum();
198 sd->section_headers = this->get_lasting_view(shoff, shnum * shdr_size,
201 // Read the section names.
202 const unsigned char* pshdrs = sd->section_headers->data();
203 const unsigned char* pshdrnames = pshdrs + elf_file->shstrndx() * shdr_size;
204 typename elfcpp::Shdr<size, big_endian> shdrnames(pshdrnames);
206 if (shdrnames.get_sh_type() != elfcpp::SHT_STRTAB)
207 this->error(_("section name section has wrong type: %u"),
208 static_cast<unsigned int>(shdrnames.get_sh_type()));
210 sd->section_names_size =
211 convert_to_section_size_type(shdrnames.get_sh_size());
212 sd->section_names = this->get_lasting_view(shdrnames.get_sh_offset(),
213 sd->section_names_size, false,
217 // If NAME is the name of a special .gnu.warning section, arrange for
218 // the warning to be issued. SHNDX is the section index. Return
219 // whether it is a warning section.
222 Object::handle_gnu_warning_section(const char* name, unsigned int shndx,
223 Symbol_table* symtab)
225 const char warn_prefix[] = ".gnu.warning.";
226 const int warn_prefix_len = sizeof warn_prefix - 1;
227 if (strncmp(name, warn_prefix, warn_prefix_len) == 0)
229 // Read the section contents to get the warning text. It would
230 // be nicer if we only did this if we have to actually issue a
231 // warning. Unfortunately, warnings are issued as we relocate
232 // sections. That means that we can not lock the object then,
233 // as we might try to issue the same warning multiple times
235 section_size_type len;
236 const unsigned char* contents = this->section_contents(shndx, &len,
240 const char* warning = name + warn_prefix_len;
241 contents = reinterpret_cast<const unsigned char*>(warning);
242 len = strlen(warning);
244 std::string warning(reinterpret_cast<const char*>(contents), len);
245 symtab->add_warning(name + warn_prefix_len, this, warning);
251 // If NAME is the name of the special section which indicates that
252 // this object was compiled with -fsplit-stack, mark it accordingly.
255 Object::handle_split_stack_section(const char* name)
257 if (strcmp(name, ".note.GNU-split-stack") == 0)
259 this->uses_split_stack_ = true;
262 if (strcmp(name, ".note.GNU-no-split-stack") == 0)
264 this->has_no_split_stack_ = true;
274 Relobj::initialize_input_to_output_map(unsigned int shndx,
275 typename elfcpp::Elf_types<size>::Elf_Addr starting_address,
276 Unordered_map<section_offset_type,
277 typename elfcpp::Elf_types<size>::Elf_Addr>* output_addresses) const {
278 Object_merge_map *map = this->object_merge_map_;
279 map->initialize_input_to_output_map<size>(shndx, starting_address,
284 Relobj::add_merge_mapping(Output_section_data *output_data,
285 unsigned int shndx, section_offset_type offset,
286 section_size_type length,
287 section_offset_type output_offset) {
288 Object_merge_map* object_merge_map = this->get_or_create_merge_map();
289 object_merge_map->add_mapping(output_data, shndx, offset, length, output_offset);
293 Relobj::merge_output_offset(unsigned int shndx, section_offset_type offset,
294 section_offset_type *poutput) const {
295 Object_merge_map* object_merge_map = this->object_merge_map_;
296 if (object_merge_map == NULL)
298 return object_merge_map->get_output_offset(shndx, offset, poutput);
301 const Output_section_data*
302 Relobj::find_merge_section(unsigned int shndx) const {
303 Object_merge_map* object_merge_map = this->object_merge_map_;
304 if (object_merge_map == NULL)
306 return object_merge_map->find_merge_section(shndx);
309 // To copy the symbols data read from the file to a local data structure.
310 // This function is called from do_layout only while doing garbage
314 Relobj::copy_symbols_data(Symbols_data* gc_sd, Read_symbols_data* sd,
315 unsigned int section_header_size)
317 gc_sd->section_headers_data =
318 new unsigned char[(section_header_size)];
319 memcpy(gc_sd->section_headers_data, sd->section_headers->data(),
320 section_header_size);
321 gc_sd->section_names_data =
322 new unsigned char[sd->section_names_size];
323 memcpy(gc_sd->section_names_data, sd->section_names->data(),
324 sd->section_names_size);
325 gc_sd->section_names_size = sd->section_names_size;
326 if (sd->symbols != NULL)
328 gc_sd->symbols_data =
329 new unsigned char[sd->symbols_size];
330 memcpy(gc_sd->symbols_data, sd->symbols->data(),
335 gc_sd->symbols_data = NULL;
337 gc_sd->symbols_size = sd->symbols_size;
338 gc_sd->external_symbols_offset = sd->external_symbols_offset;
339 if (sd->symbol_names != NULL)
341 gc_sd->symbol_names_data =
342 new unsigned char[sd->symbol_names_size];
343 memcpy(gc_sd->symbol_names_data, sd->symbol_names->data(),
344 sd->symbol_names_size);
348 gc_sd->symbol_names_data = NULL;
350 gc_sd->symbol_names_size = sd->symbol_names_size;
353 // This function determines if a particular section name must be included
354 // in the link. This is used during garbage collection to determine the
355 // roots of the worklist.
358 Relobj::is_section_name_included(const char* name)
360 if (is_prefix_of(".ctors", name)
361 || is_prefix_of(".dtors", name)
362 || is_prefix_of(".note", name)
363 || is_prefix_of(".init", name)
364 || is_prefix_of(".fini", name)
365 || is_prefix_of(".gcc_except_table", name)
366 || is_prefix_of(".jcr", name)
367 || is_prefix_of(".preinit_array", name)
368 || (is_prefix_of(".text", name)
369 && strstr(name, "personality"))
370 || (is_prefix_of(".data", name)
371 && strstr(name, "personality"))
372 || (is_prefix_of(".sdata", name)
373 && strstr(name, "personality"))
374 || (is_prefix_of(".gnu.linkonce.d", name)
375 && strstr(name, "personality"))
376 || (is_prefix_of(".rodata", name)
377 && strstr(name, "nptl_version")))
384 // Finalize the incremental relocation information. Allocates a block
385 // of relocation entries for each symbol, and sets the reloc_bases_
386 // array to point to the first entry in each block. If CLEAR_COUNTS
387 // is TRUE, also clear the per-symbol relocation counters.
390 Relobj::finalize_incremental_relocs(Layout* layout, bool clear_counts)
392 unsigned int nsyms = this->get_global_symbols()->size();
393 this->reloc_bases_ = new unsigned int[nsyms];
395 gold_assert(this->reloc_bases_ != NULL);
396 gold_assert(layout->incremental_inputs() != NULL);
398 unsigned int rindex = layout->incremental_inputs()->get_reloc_count();
399 for (unsigned int i = 0; i < nsyms; ++i)
401 this->reloc_bases_[i] = rindex;
402 rindex += this->reloc_counts_[i];
404 this->reloc_counts_[i] = 0;
406 layout->incremental_inputs()->set_reloc_count(rindex);
410 Relobj::get_or_create_merge_map()
412 if (!this->object_merge_map_)
413 this->object_merge_map_ = new Object_merge_map();
414 return this->object_merge_map_;
417 // Class Sized_relobj.
419 // Iterate over local symbols, calling a visitor class V for each GOT offset
420 // associated with a local symbol.
422 template<int size, bool big_endian>
424 Sized_relobj<size, big_endian>::do_for_all_local_got_entries(
425 Got_offset_list::Visitor* v) const
427 unsigned int nsyms = this->local_symbol_count();
428 for (unsigned int i = 0; i < nsyms; i++)
430 Local_got_entry_key key(i, 0);
431 Local_got_offsets::const_iterator p = this->local_got_offsets_.find(key);
432 if (p != this->local_got_offsets_.end())
434 const Got_offset_list* got_offsets = p->second;
435 got_offsets->for_all_got_offsets(v);
440 // Get the address of an output section.
442 template<int size, bool big_endian>
444 Sized_relobj<size, big_endian>::do_output_section_address(
447 // If the input file is linked as --just-symbols, the output
448 // section address is the input section address.
449 if (this->just_symbols())
450 return this->section_address(shndx);
452 const Output_section* os = this->do_output_section(shndx);
453 gold_assert(os != NULL);
454 return os->address();
457 // Class Sized_relobj_file.
459 template<int size, bool big_endian>
460 Sized_relobj_file<size, big_endian>::Sized_relobj_file(
461 const std::string& name,
462 Input_file* input_file,
464 const elfcpp::Ehdr<size, big_endian>& ehdr)
465 : Sized_relobj<size, big_endian>(name, input_file, offset),
466 elf_file_(this, ehdr),
468 local_symbol_count_(0),
469 output_local_symbol_count_(0),
470 output_local_dynsym_count_(0),
473 local_symbol_offset_(0),
474 local_dynsym_offset_(0),
476 local_plt_offsets_(),
477 kept_comdat_sections_(),
478 has_eh_frame_(false),
479 is_deferred_layout_(false),
481 deferred_layout_relocs_(),
484 this->e_type_ = ehdr.get_e_type();
487 template<int size, bool big_endian>
488 Sized_relobj_file<size, big_endian>::~Sized_relobj_file()
492 // Set up an object file based on the file header. This sets up the
493 // section information.
495 template<int size, bool big_endian>
497 Sized_relobj_file<size, big_endian>::do_setup()
499 const unsigned int shnum = this->elf_file_.shnum();
500 this->set_shnum(shnum);
503 // Find the SHT_SYMTAB section, given the section headers. The ELF
504 // standard says that maybe in the future there can be more than one
505 // SHT_SYMTAB section. Until somebody figures out how that could
506 // work, we assume there is only one.
508 template<int size, bool big_endian>
510 Sized_relobj_file<size, big_endian>::find_symtab(const unsigned char* pshdrs)
512 const unsigned int shnum = this->shnum();
513 this->symtab_shndx_ = 0;
516 // Look through the sections in reverse order, since gas tends
517 // to put the symbol table at the end.
518 const unsigned char* p = pshdrs + shnum * This::shdr_size;
519 unsigned int i = shnum;
520 unsigned int xindex_shndx = 0;
521 unsigned int xindex_link = 0;
525 p -= This::shdr_size;
526 typename This::Shdr shdr(p);
527 if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB)
529 this->symtab_shndx_ = i;
530 if (xindex_shndx > 0 && xindex_link == i)
533 new Xindex(this->elf_file_.large_shndx_offset());
534 xindex->read_symtab_xindex<size, big_endian>(this,
537 this->set_xindex(xindex);
542 // Try to pick up the SHT_SYMTAB_SHNDX section, if there is
543 // one. This will work if it follows the SHT_SYMTAB
545 if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX)
548 xindex_link = this->adjust_shndx(shdr.get_sh_link());
554 // Return the Xindex structure to use for object with lots of
557 template<int size, bool big_endian>
559 Sized_relobj_file<size, big_endian>::do_initialize_xindex()
561 gold_assert(this->symtab_shndx_ != -1U);
562 Xindex* xindex = new Xindex(this->elf_file_.large_shndx_offset());
563 xindex->initialize_symtab_xindex<size, big_endian>(this, this->symtab_shndx_);
567 // Return whether SHDR has the right type and flags to be a GNU
568 // .eh_frame section.
570 template<int size, bool big_endian>
572 Sized_relobj_file<size, big_endian>::check_eh_frame_flags(
573 const elfcpp::Shdr<size, big_endian>* shdr) const
575 elfcpp::Elf_Word sh_type = shdr->get_sh_type();
576 return ((sh_type == elfcpp::SHT_PROGBITS
577 || sh_type == parameters->target().unwind_section_type())
578 && (shdr->get_sh_flags() & elfcpp::SHF_ALLOC) != 0);
581 // Find the section header with the given name.
583 template<int size, bool big_endian>
586 const unsigned char* pshdrs,
589 section_size_type names_size,
590 const unsigned char* hdr) const
592 const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
593 const unsigned int shnum = this->shnum();
594 const unsigned char* hdr_end = pshdrs + shdr_size * shnum;
601 // We found HDR last time we were called, continue looking.
602 typename elfcpp::Shdr<size, big_endian> shdr(hdr);
603 sh_name = shdr.get_sh_name();
607 // Look for the next occurrence of NAME in NAMES.
608 // The fact that .shstrtab produced by current GNU tools is
609 // string merged means we shouldn't have both .not.foo and
610 // .foo in .shstrtab, and multiple .foo sections should all
611 // have the same sh_name. However, this is not guaranteed
612 // by the ELF spec and not all ELF object file producers may
614 size_t len = strlen(name) + 1;
615 const char *p = sh_name ? names + sh_name + len : names;
616 p = reinterpret_cast<const char*>(memmem(p, names_size - (p - names),
627 while (hdr < hdr_end)
629 typename elfcpp::Shdr<size, big_endian> shdr(hdr);
630 if (shdr.get_sh_name() == sh_name)
640 // Return whether there is a GNU .eh_frame section, given the section
641 // headers and the section names.
643 template<int size, bool big_endian>
645 Sized_relobj_file<size, big_endian>::find_eh_frame(
646 const unsigned char* pshdrs,
648 section_size_type names_size) const
650 const unsigned char* s = NULL;
654 s = this->template find_shdr<size, big_endian>(pshdrs, ".eh_frame",
655 names, names_size, s);
659 typename This::Shdr shdr(s);
660 if (this->check_eh_frame_flags(&shdr))
665 // Return TRUE if this is a section whose contents will be needed in the
666 // Add_symbols task. This function is only called for sections that have
667 // already passed the test in is_compressed_debug_section() and the debug
668 // section name prefix, ".debug"/".zdebug", has been skipped.
671 need_decompressed_section(const char* name)
676 #ifdef ENABLE_THREADS
677 // Decompressing these sections now will help only if we're
679 if (parameters->options().threads())
681 // We will need .zdebug_str if this is not an incremental link
682 // (i.e., we are processing string merge sections) or if we need
683 // to build a gdb index.
684 if ((!parameters->incremental() || parameters->options().gdb_index())
685 && strcmp(name, "str") == 0)
688 // We will need these other sections when building a gdb index.
689 if (parameters->options().gdb_index()
690 && (strcmp(name, "info") == 0
691 || strcmp(name, "types") == 0
692 || strcmp(name, "pubnames") == 0
693 || strcmp(name, "pubtypes") == 0
694 || strcmp(name, "ranges") == 0
695 || strcmp(name, "abbrev") == 0))
700 // Even when single-threaded, we will need .zdebug_str if this is
701 // not an incremental link and we are building a gdb index.
702 // Otherwise, we would decompress the section twice: once for
703 // string merge processing, and once for building the gdb index.
704 if (!parameters->incremental()
705 && parameters->options().gdb_index()
706 && strcmp(name, "str") == 0)
712 // Build a table for any compressed debug sections, mapping each section index
713 // to the uncompressed size and (if needed) the decompressed contents.
715 template<int size, bool big_endian>
716 Compressed_section_map*
717 build_compressed_section_map(
718 const unsigned char* pshdrs,
721 section_size_type names_size,
723 bool decompress_if_needed)
725 Compressed_section_map* uncompressed_map = new Compressed_section_map();
726 const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
727 const unsigned char* p = pshdrs + shdr_size;
729 for (unsigned int i = 1; i < shnum; ++i, p += shdr_size)
731 typename elfcpp::Shdr<size, big_endian> shdr(p);
732 if (shdr.get_sh_type() == elfcpp::SHT_PROGBITS
733 && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
735 if (shdr.get_sh_name() >= names_size)
737 obj->error(_("bad section name offset for section %u: %lu"),
738 i, static_cast<unsigned long>(shdr.get_sh_name()));
742 const char* name = names + shdr.get_sh_name();
743 bool is_compressed = ((shdr.get_sh_flags()
744 & elfcpp::SHF_COMPRESSED) != 0);
745 bool is_zcompressed = (!is_compressed
746 && is_compressed_debug_section(name));
748 if (is_zcompressed || is_compressed)
750 section_size_type len;
751 const unsigned char* contents =
752 obj->section_contents(i, &len, false);
753 uint64_t uncompressed_size;
756 // Skip over the ".zdebug" prefix.
758 uncompressed_size = get_uncompressed_size(contents, len);
762 // Skip over the ".debug" prefix.
764 elfcpp::Chdr<size, big_endian> chdr(contents);
765 uncompressed_size = chdr.get_ch_size();
767 Compressed_section_info info;
768 info.size = convert_to_section_size_type(uncompressed_size);
769 info.flag = shdr.get_sh_flags();
770 info.contents = NULL;
771 if (uncompressed_size != -1ULL)
773 unsigned char* uncompressed_data = NULL;
774 if (decompress_if_needed && need_decompressed_section(name))
776 uncompressed_data = new unsigned char[uncompressed_size];
777 if (decompress_input_section(contents, len,
781 shdr.get_sh_flags()))
782 info.contents = uncompressed_data;
784 delete[] uncompressed_data;
786 (*uncompressed_map)[i] = info;
791 return uncompressed_map;
794 // Stash away info for a number of special sections.
795 // Return true if any of the sections found require local symbols to be read.
797 template<int size, bool big_endian>
799 Sized_relobj_file<size, big_endian>::do_find_special_sections(
800 Read_symbols_data* sd)
802 const unsigned char* const pshdrs = sd->section_headers->data();
803 const unsigned char* namesu = sd->section_names->data();
804 const char* names = reinterpret_cast<const char*>(namesu);
806 if (this->find_eh_frame(pshdrs, names, sd->section_names_size))
807 this->has_eh_frame_ = true;
809 Compressed_section_map* compressed_sections =
810 build_compressed_section_map<size, big_endian>(
811 pshdrs, this->shnum(), names, sd->section_names_size, this, true);
812 if (compressed_sections != NULL)
813 this->set_compressed_sections(compressed_sections);
815 return (this->has_eh_frame_
816 || (!parameters->options().relocatable()
817 && parameters->options().gdb_index()
818 && (memmem(names, sd->section_names_size, "debug_info", 11) != NULL
819 || memmem(names, sd->section_names_size,
820 "debug_types", 12) != NULL)));
823 // Read the sections and symbols from an object file.
825 template<int size, bool big_endian>
827 Sized_relobj_file<size, big_endian>::do_read_symbols(Read_symbols_data* sd)
829 this->base_read_symbols(sd);
832 // Read the sections and symbols from an object file. This is common
833 // code for all target-specific overrides of do_read_symbols().
835 template<int size, bool big_endian>
837 Sized_relobj_file<size, big_endian>::base_read_symbols(Read_symbols_data* sd)
839 this->read_section_data(&this->elf_file_, sd);
841 const unsigned char* const pshdrs = sd->section_headers->data();
843 this->find_symtab(pshdrs);
845 bool need_local_symbols = this->do_find_special_sections(sd);
848 sd->symbols_size = 0;
849 sd->external_symbols_offset = 0;
850 sd->symbol_names = NULL;
851 sd->symbol_names_size = 0;
853 if (this->symtab_shndx_ == 0)
855 // No symbol table. Weird but legal.
859 // Get the symbol table section header.
860 typename This::Shdr symtabshdr(pshdrs
861 + this->symtab_shndx_ * This::shdr_size);
862 gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
864 // If this object has a .eh_frame section, or if building a .gdb_index
865 // section and there is debug info, we need all the symbols.
866 // Otherwise we only need the external symbols. While it would be
867 // simpler to just always read all the symbols, I've seen object
868 // files with well over 2000 local symbols, which for a 64-bit
869 // object file format is over 5 pages that we don't need to read
872 const int sym_size = This::sym_size;
873 const unsigned int loccount = symtabshdr.get_sh_info();
874 this->local_symbol_count_ = loccount;
875 this->local_values_.resize(loccount);
876 section_offset_type locsize = loccount * sym_size;
877 off_t dataoff = symtabshdr.get_sh_offset();
878 section_size_type datasize =
879 convert_to_section_size_type(symtabshdr.get_sh_size());
880 off_t extoff = dataoff + locsize;
881 section_size_type extsize = datasize - locsize;
883 off_t readoff = need_local_symbols ? dataoff : extoff;
884 section_size_type readsize = need_local_symbols ? datasize : extsize;
888 // No external symbols. Also weird but also legal.
892 File_view* fvsymtab = this->get_lasting_view(readoff, readsize, true, false);
894 // Read the section header for the symbol names.
895 unsigned int strtab_shndx = this->adjust_shndx(symtabshdr.get_sh_link());
896 if (strtab_shndx >= this->shnum())
898 this->error(_("invalid symbol table name index: %u"), strtab_shndx);
901 typename This::Shdr strtabshdr(pshdrs + strtab_shndx * This::shdr_size);
902 if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB)
904 this->error(_("symbol table name section has wrong type: %u"),
905 static_cast<unsigned int>(strtabshdr.get_sh_type()));
909 // Read the symbol names.
910 File_view* fvstrtab = this->get_lasting_view(strtabshdr.get_sh_offset(),
911 strtabshdr.get_sh_size(),
914 sd->symbols = fvsymtab;
915 sd->symbols_size = readsize;
916 sd->external_symbols_offset = need_local_symbols ? locsize : 0;
917 sd->symbol_names = fvstrtab;
918 sd->symbol_names_size =
919 convert_to_section_size_type(strtabshdr.get_sh_size());
922 // Return the section index of symbol SYM. Set *VALUE to its value in
923 // the object file. Set *IS_ORDINARY if this is an ordinary section
924 // index, not a special code between SHN_LORESERVE and SHN_HIRESERVE.
925 // Note that for a symbol which is not defined in this object file,
926 // this will set *VALUE to 0 and return SHN_UNDEF; it will not return
927 // the final value of the symbol in the link.
929 template<int size, bool big_endian>
931 Sized_relobj_file<size, big_endian>::symbol_section_and_value(unsigned int sym,
935 section_size_type symbols_size;
936 const unsigned char* symbols = this->section_contents(this->symtab_shndx_,
940 const size_t count = symbols_size / This::sym_size;
941 gold_assert(sym < count);
943 elfcpp::Sym<size, big_endian> elfsym(symbols + sym * This::sym_size);
944 *value = elfsym.get_st_value();
946 return this->adjust_sym_shndx(sym, elfsym.get_st_shndx(), is_ordinary);
949 // Return whether to include a section group in the link. LAYOUT is
950 // used to keep track of which section groups we have already seen.
951 // INDEX is the index of the section group and SHDR is the section
952 // header. If we do not want to include this group, we set bits in
953 // OMIT for each section which should be discarded.
955 template<int size, bool big_endian>
957 Sized_relobj_file<size, big_endian>::include_section_group(
958 Symbol_table* symtab,
962 const unsigned char* shdrs,
963 const char* section_names,
964 section_size_type section_names_size,
965 std::vector<bool>* omit)
967 // Read the section contents.
968 typename This::Shdr shdr(shdrs + index * This::shdr_size);
969 const unsigned char* pcon = this->get_view(shdr.get_sh_offset(),
970 shdr.get_sh_size(), true, false);
971 const elfcpp::Elf_Word* pword =
972 reinterpret_cast<const elfcpp::Elf_Word*>(pcon);
974 // The first word contains flags. We only care about COMDAT section
975 // groups. Other section groups are always included in the link
976 // just like ordinary sections.
977 elfcpp::Elf_Word flags = elfcpp::Swap<32, big_endian>::readval(pword);
979 // Look up the group signature, which is the name of a symbol. ELF
980 // uses a symbol name because some group signatures are long, and
981 // the name is generally already in the symbol table, so it makes
982 // sense to put the long string just once in .strtab rather than in
983 // both .strtab and .shstrtab.
985 // Get the appropriate symbol table header (this will normally be
986 // the single SHT_SYMTAB section, but in principle it need not be).
987 const unsigned int link = this->adjust_shndx(shdr.get_sh_link());
988 typename This::Shdr symshdr(this, this->elf_file_.section_header(link));
990 // Read the symbol table entry.
991 unsigned int symndx = shdr.get_sh_info();
992 if (symndx >= symshdr.get_sh_size() / This::sym_size)
994 this->error(_("section group %u info %u out of range"),
998 off_t symoff = symshdr.get_sh_offset() + symndx * This::sym_size;
999 const unsigned char* psym = this->get_view(symoff, This::sym_size, true,
1001 elfcpp::Sym<size, big_endian> sym(psym);
1003 // Read the symbol table names.
1004 section_size_type symnamelen;
1005 const unsigned char* psymnamesu;
1006 psymnamesu = this->section_contents(this->adjust_shndx(symshdr.get_sh_link()),
1008 const char* psymnames = reinterpret_cast<const char*>(psymnamesu);
1010 // Get the section group signature.
1011 if (sym.get_st_name() >= symnamelen)
1013 this->error(_("symbol %u name offset %u out of range"),
1014 symndx, sym.get_st_name());
1018 std::string signature(psymnames + sym.get_st_name());
1020 // It seems that some versions of gas will create a section group
1021 // associated with a section symbol, and then fail to give a name to
1022 // the section symbol. In such a case, use the name of the section.
1023 if (signature[0] == '\0' && sym.get_st_type() == elfcpp::STT_SECTION)
1026 unsigned int sym_shndx = this->adjust_sym_shndx(symndx,
1029 if (!is_ordinary || sym_shndx >= this->shnum())
1031 this->error(_("symbol %u invalid section index %u"),
1035 typename This::Shdr member_shdr(shdrs + sym_shndx * This::shdr_size);
1036 if (member_shdr.get_sh_name() < section_names_size)
1037 signature = section_names + member_shdr.get_sh_name();
1040 // Record this section group in the layout, and see whether we've already
1041 // seen one with the same signature.
1044 Kept_section* kept_section = NULL;
1046 if ((flags & elfcpp::GRP_COMDAT) == 0)
1048 include_group = true;
1053 include_group = layout->find_or_add_kept_section(signature,
1055 true, &kept_section);
1059 if (is_comdat && include_group)
1061 Incremental_inputs* incremental_inputs = layout->incremental_inputs();
1062 if (incremental_inputs != NULL)
1063 incremental_inputs->report_comdat_group(this, signature.c_str());
1066 size_t count = shdr.get_sh_size() / sizeof(elfcpp::Elf_Word);
1068 std::vector<unsigned int> shndxes;
1069 bool relocate_group = include_group && parameters->options().relocatable();
1071 shndxes.reserve(count - 1);
1073 for (size_t i = 1; i < count; ++i)
1075 elfcpp::Elf_Word shndx =
1076 this->adjust_shndx(elfcpp::Swap<32, big_endian>::readval(pword + i));
1079 shndxes.push_back(shndx);
1081 if (shndx >= this->shnum())
1083 this->error(_("section %u in section group %u out of range"),
1088 // Check for an earlier section number, since we're going to get
1089 // it wrong--we may have already decided to include the section.
1091 this->error(_("invalid section group %u refers to earlier section %u"),
1094 // Get the name of the member section.
1095 typename This::Shdr member_shdr(shdrs + shndx * This::shdr_size);
1096 if (member_shdr.get_sh_name() >= section_names_size)
1098 // This is an error, but it will be diagnosed eventually
1099 // in do_layout, so we don't need to do anything here but
1103 std::string mname(section_names + member_shdr.get_sh_name());
1108 kept_section->add_comdat_section(mname, shndx,
1109 member_shdr.get_sh_size());
1113 (*omit)[shndx] = true;
1115 // Store a mapping from this section to the Kept_section
1116 // information for the group. This mapping is used for
1117 // relocation processing and diagnostics.
1118 // If the kept section is a linkonce section, we don't
1119 // bother with it unless the comdat group contains just
1120 // a single section, making it easy to match up.
1122 && (kept_section->is_comdat() || count == 2))
1123 this->set_kept_comdat_section(shndx, true, symndx,
1124 member_shdr.get_sh_size(),
1130 layout->layout_group(symtab, this, index, name, signature.c_str(),
1131 shdr, flags, &shndxes);
1133 return include_group;
1136 // Whether to include a linkonce section in the link. NAME is the
1137 // name of the section and SHDR is the section header.
1139 // Linkonce sections are a GNU extension implemented in the original
1140 // GNU linker before section groups were defined. The semantics are
1141 // that we only include one linkonce section with a given name. The
1142 // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME,
1143 // where T is the type of section and SYMNAME is the name of a symbol.
1144 // In an attempt to make linkonce sections interact well with section
1145 // groups, we try to identify SYMNAME and use it like a section group
1146 // signature. We want to block section groups with that signature,
1147 // but not other linkonce sections with that signature. We also use
1148 // the full name of the linkonce section as a normal section group
1151 template<int size, bool big_endian>
1153 Sized_relobj_file<size, big_endian>::include_linkonce_section(
1157 const elfcpp::Shdr<size, big_endian>& shdr)
1159 typename elfcpp::Elf_types<size>::Elf_WXword sh_size = shdr.get_sh_size();
1160 // In general the symbol name we want will be the string following
1161 // the last '.'. However, we have to handle the case of
1162 // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by
1163 // some versions of gcc. So we use a heuristic: if the name starts
1164 // with ".gnu.linkonce.t.", we use everything after that. Otherwise
1165 // we look for the last '.'. We can't always simply skip
1166 // ".gnu.linkonce.X", because we have to deal with cases like
1167 // ".gnu.linkonce.d.rel.ro.local".
1168 const char* const linkonce_t = ".gnu.linkonce.t.";
1169 const char* symname;
1170 if (strncmp(name, linkonce_t, strlen(linkonce_t)) == 0)
1171 symname = name + strlen(linkonce_t);
1173 symname = strrchr(name, '.') + 1;
1174 std::string sig1(symname);
1175 std::string sig2(name);
1176 Kept_section* kept1;
1177 Kept_section* kept2;
1178 bool include1 = layout->find_or_add_kept_section(sig1, this, index, false,
1180 bool include2 = layout->find_or_add_kept_section(sig2, this, index, false,
1185 // We are not including this section because we already saw the
1186 // name of the section as a signature. This normally implies
1187 // that the kept section is another linkonce section. If it is
1188 // the same size, record it as the section which corresponds to
1190 if (kept2->object() != NULL && !kept2->is_comdat())
1191 this->set_kept_comdat_section(index, false, 0, sh_size, kept2);
1195 // The section is being discarded on the basis of its symbol
1196 // name. This means that the corresponding kept section was
1197 // part of a comdat group, and it will be difficult to identify
1198 // the specific section within that group that corresponds to
1199 // this linkonce section. We'll handle the simple case where
1200 // the group has only one member section. Otherwise, it's not
1201 // worth the effort.
1202 if (kept1->object() != NULL && kept1->is_comdat())
1203 this->set_kept_comdat_section(index, false, 0, sh_size, kept1);
1207 kept1->set_linkonce_size(sh_size);
1208 kept2->set_linkonce_size(sh_size);
1211 return include1 && include2;
1214 // Layout an input section.
1216 template<int size, bool big_endian>
1218 Sized_relobj_file<size, big_endian>::layout_section(
1222 const typename This::Shdr& shdr,
1223 unsigned int sh_type,
1224 unsigned int reloc_shndx,
1225 unsigned int reloc_type)
1228 Output_section* os = layout->layout(this, shndx, name, shdr, sh_type,
1229 reloc_shndx, reloc_type, &offset);
1231 this->output_sections()[shndx] = os;
1233 this->section_offsets()[shndx] = invalid_address;
1235 this->section_offsets()[shndx] = convert_types<Address, off_t>(offset);
1237 // If this section requires special handling, and if there are
1238 // relocs that apply to it, then we must do the special handling
1239 // before we apply the relocs.
1240 if (offset == -1 && reloc_shndx != 0)
1241 this->set_relocs_must_follow_section_writes();
1244 // Layout an input .eh_frame section.
1246 template<int size, bool big_endian>
1248 Sized_relobj_file<size, big_endian>::layout_eh_frame_section(
1250 const unsigned char* symbols_data,
1251 section_size_type symbols_size,
1252 const unsigned char* symbol_names_data,
1253 section_size_type symbol_names_size,
1255 const typename This::Shdr& shdr,
1256 unsigned int reloc_shndx,
1257 unsigned int reloc_type)
1259 gold_assert(this->has_eh_frame_);
1262 Output_section* os = layout->layout_eh_frame(this,
1272 this->output_sections()[shndx] = os;
1273 if (os == NULL || offset == -1)
1274 this->section_offsets()[shndx] = invalid_address;
1276 this->section_offsets()[shndx] = convert_types<Address, off_t>(offset);
1278 // If this section requires special handling, and if there are
1279 // relocs that aply to it, then we must do the special handling
1280 // before we apply the relocs.
1281 if (os != NULL && offset == -1 && reloc_shndx != 0)
1282 this->set_relocs_must_follow_section_writes();
1285 // Layout an input .note.gnu.property section.
1287 // This note section has an *extremely* non-standard layout.
1288 // The gABI spec says that ELF-64 files should have 8-byte fields and
1289 // 8-byte alignment in the note section, but the Gnu tools generally
1290 // use 4-byte fields and 4-byte alignment (see the comment for
1291 // Layout::create_note). This section uses 4-byte fields (i.e.,
1292 // namesz, descsz, and type are always 4 bytes), the name field is
1293 // padded to a multiple of 4 bytes, but the desc field is padded
1294 // to a multiple of 4 or 8 bytes, depending on the ELF class.
1295 // The individual properties within the desc field always use
1296 // 4-byte pr_type and pr_datasz fields, but pr_data is padded to
1297 // a multiple of 4 or 8 bytes, depending on the ELF class.
1299 template<int size, bool big_endian>
1301 Sized_relobj_file<size, big_endian>::layout_gnu_property_section(
1305 section_size_type contents_len;
1306 const unsigned char* pcontents = this->section_contents(shndx,
1309 const unsigned char* pcontents_end = pcontents + contents_len;
1311 // Loop over all the notes in this section.
1312 while (pcontents < pcontents_end)
1314 if (pcontents + 16 > pcontents_end)
1316 gold_warning(_("%s: corrupt .note.gnu.property section "
1317 "(note too short)"),
1318 this->name().c_str());
1322 size_t namesz = elfcpp::Swap<32, big_endian>::readval(pcontents);
1323 size_t descsz = elfcpp::Swap<32, big_endian>::readval(pcontents + 4);
1324 unsigned int ntype = elfcpp::Swap<32, big_endian>::readval(pcontents + 8);
1325 const unsigned char* pname = pcontents + 12;
1327 if (namesz != 4 || strcmp(reinterpret_cast<const char*>(pname), "GNU") != 0)
1329 gold_warning(_("%s: corrupt .note.gnu.property section "
1330 "(name is not 'GNU')"),
1331 this->name().c_str());
1335 if (ntype != elfcpp::NT_GNU_PROPERTY_TYPE_0)
1337 gold_warning(_("%s: unsupported note type %d "
1338 "in .note.gnu.property section"),
1339 this->name().c_str(), ntype);
1343 size_t aligned_namesz = align_address(namesz, 4);
1344 const unsigned char* pdesc = pname + aligned_namesz;
1346 if (pdesc + descsz > pcontents + contents_len)
1348 gold_warning(_("%s: corrupt .note.gnu.property section"),
1349 this->name().c_str());
1353 const unsigned char* pprop = pdesc;
1355 // Loop over the program properties in this note.
1356 while (pprop < pdesc + descsz)
1358 if (pprop + 8 > pdesc + descsz)
1360 gold_warning(_("%s: corrupt .note.gnu.property section"),
1361 this->name().c_str());
1364 unsigned int pr_type = elfcpp::Swap<32, big_endian>::readval(pprop);
1365 size_t pr_datasz = elfcpp::Swap<32, big_endian>::readval(pprop + 4);
1367 if (pprop + pr_datasz > pdesc + descsz)
1369 gold_warning(_("%s: corrupt .note.gnu.property section"),
1370 this->name().c_str());
1373 layout->layout_gnu_property(ntype, pr_type, pr_datasz, pprop, this);
1374 pprop += align_address(pr_datasz, size / 8);
1377 pcontents = pdesc + align_address(descsz, size / 8);
1381 // Lay out the input sections. We walk through the sections and check
1382 // whether they should be included in the link. If they should, we
1383 // pass them to the Layout object, which will return an output section
1385 // This function is called twice sometimes, two passes, when mapping
1386 // of input sections to output sections must be delayed.
1387 // This is true for the following :
1388 // * Garbage collection (--gc-sections): Some input sections will be
1389 // discarded and hence the assignment must wait until the second pass.
1390 // In the first pass, it is for setting up some sections as roots to
1391 // a work-list for --gc-sections and to do comdat processing.
1392 // * Identical Code Folding (--icf=<safe,all>): Some input sections
1393 // will be folded and hence the assignment must wait.
1394 // * Using plugins to map some sections to unique segments: Mapping
1395 // some sections to unique segments requires mapping them to unique
1396 // output sections too. This can be done via plugins now and this
1397 // information is not available in the first pass.
1399 template<int size, bool big_endian>
1401 Sized_relobj_file<size, big_endian>::do_layout(Symbol_table* symtab,
1403 Read_symbols_data* sd)
1405 const unsigned int unwind_section_type =
1406 parameters->target().unwind_section_type();
1407 const unsigned int shnum = this->shnum();
1409 /* Should this function be called twice? */
1410 bool is_two_pass = (parameters->options().gc_sections()
1411 || parameters->options().icf_enabled()
1412 || layout->is_unique_segment_for_sections_specified());
1414 /* Only one of is_pass_one and is_pass_two is true. Both are false when
1415 a two-pass approach is not needed. */
1416 bool is_pass_one = false;
1417 bool is_pass_two = false;
1419 Symbols_data* gc_sd = NULL;
1421 /* Check if do_layout needs to be two-pass. If so, find out which pass
1422 should happen. In the first pass, the data in sd is saved to be used
1423 later in the second pass. */
1426 gc_sd = this->get_symbols_data();
1429 gold_assert(sd != NULL);
1434 if (parameters->options().gc_sections())
1435 gold_assert(symtab->gc()->is_worklist_ready());
1436 if (parameters->options().icf_enabled())
1437 gold_assert(symtab->icf()->is_icf_ready());
1447 // During garbage collection save the symbols data to use it when
1448 // re-entering this function.
1449 gc_sd = new Symbols_data;
1450 this->copy_symbols_data(gc_sd, sd, This::shdr_size * shnum);
1451 this->set_symbols_data(gc_sd);
1454 const unsigned char* section_headers_data = NULL;
1455 section_size_type section_names_size;
1456 const unsigned char* symbols_data = NULL;
1457 section_size_type symbols_size;
1458 const unsigned char* symbol_names_data = NULL;
1459 section_size_type symbol_names_size;
1463 section_headers_data = gc_sd->section_headers_data;
1464 section_names_size = gc_sd->section_names_size;
1465 symbols_data = gc_sd->symbols_data;
1466 symbols_size = gc_sd->symbols_size;
1467 symbol_names_data = gc_sd->symbol_names_data;
1468 symbol_names_size = gc_sd->symbol_names_size;
1472 section_headers_data = sd->section_headers->data();
1473 section_names_size = sd->section_names_size;
1474 if (sd->symbols != NULL)
1475 symbols_data = sd->symbols->data();
1476 symbols_size = sd->symbols_size;
1477 if (sd->symbol_names != NULL)
1478 symbol_names_data = sd->symbol_names->data();
1479 symbol_names_size = sd->symbol_names_size;
1482 // Get the section headers.
1483 const unsigned char* shdrs = section_headers_data;
1484 const unsigned char* pshdrs;
1486 // Get the section names.
1487 const unsigned char* pnamesu = (is_two_pass
1488 ? gc_sd->section_names_data
1489 : sd->section_names->data());
1491 const char* pnames = reinterpret_cast<const char*>(pnamesu);
1493 // If any input files have been claimed by plugins, we need to defer
1494 // actual layout until the replacement files have arrived.
1495 const bool should_defer_layout =
1496 (parameters->options().has_plugins()
1497 && parameters->options().plugins()->should_defer_layout());
1498 unsigned int num_sections_to_defer = 0;
1500 // For each section, record the index of the reloc section if any.
1501 // Use 0 to mean that there is no reloc section, -1U to mean that
1502 // there is more than one.
1503 std::vector<unsigned int> reloc_shndx(shnum, 0);
1504 std::vector<unsigned int> reloc_type(shnum, elfcpp::SHT_NULL);
1505 // Skip the first, dummy, section.
1506 pshdrs = shdrs + This::shdr_size;
1507 for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size)
1509 typename This::Shdr shdr(pshdrs);
1511 // Count the number of sections whose layout will be deferred.
1512 if (should_defer_layout && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC))
1513 ++num_sections_to_defer;
1515 unsigned int sh_type = shdr.get_sh_type();
1516 if (sh_type == elfcpp::SHT_REL || sh_type == elfcpp::SHT_RELA)
1518 unsigned int target_shndx = this->adjust_shndx(shdr.get_sh_info());
1519 if (target_shndx == 0 || target_shndx >= shnum)
1521 this->error(_("relocation section %u has bad info %u"),
1526 if (reloc_shndx[target_shndx] != 0)
1527 reloc_shndx[target_shndx] = -1U;
1530 reloc_shndx[target_shndx] = i;
1531 reloc_type[target_shndx] = sh_type;
1536 Output_sections& out_sections(this->output_sections());
1537 std::vector<Address>& out_section_offsets(this->section_offsets());
1541 out_sections.resize(shnum);
1542 out_section_offsets.resize(shnum);
1545 // If we are only linking for symbols, then there is nothing else to
1547 if (this->input_file()->just_symbols())
1551 delete sd->section_headers;
1552 sd->section_headers = NULL;
1553 delete sd->section_names;
1554 sd->section_names = NULL;
1559 if (num_sections_to_defer > 0)
1561 parameters->options().plugins()->add_deferred_layout_object(this);
1562 this->deferred_layout_.reserve(num_sections_to_defer);
1563 this->is_deferred_layout_ = true;
1566 // Whether we've seen a .note.GNU-stack section.
1567 bool seen_gnu_stack = false;
1568 // The flags of a .note.GNU-stack section.
1569 uint64_t gnu_stack_flags = 0;
1571 // Keep track of which sections to omit.
1572 std::vector<bool> omit(shnum, false);
1574 // Keep track of reloc sections when emitting relocations.
1575 const bool relocatable = parameters->options().relocatable();
1576 const bool emit_relocs = (relocatable
1577 || parameters->options().emit_relocs());
1578 std::vector<unsigned int> reloc_sections;
1580 // Keep track of .eh_frame sections.
1581 std::vector<unsigned int> eh_frame_sections;
1583 // Keep track of .debug_info and .debug_types sections.
1584 std::vector<unsigned int> debug_info_sections;
1585 std::vector<unsigned int> debug_types_sections;
1587 // Skip the first, dummy, section.
1588 pshdrs = shdrs + This::shdr_size;
1589 for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size)
1591 typename This::Shdr shdr(pshdrs);
1592 const unsigned int sh_name = shdr.get_sh_name();
1593 unsigned int sh_type = shdr.get_sh_type();
1595 if (sh_name >= section_names_size)
1597 this->error(_("bad section name offset for section %u: %lu"),
1598 i, static_cast<unsigned long>(sh_name));
1602 const char* name = pnames + sh_name;
1606 if (this->handle_gnu_warning_section(name, i, symtab))
1608 if (!relocatable && !parameters->options().shared())
1612 // The .note.GNU-stack section is special. It gives the
1613 // protection flags that this object file requires for the stack
1615 if (strcmp(name, ".note.GNU-stack") == 0)
1617 seen_gnu_stack = true;
1618 gnu_stack_flags |= shdr.get_sh_flags();
1622 // The .note.GNU-split-stack section is also special. It
1623 // indicates that the object was compiled with
1625 if (this->handle_split_stack_section(name))
1627 if (!relocatable && !parameters->options().shared())
1631 // Skip attributes section.
1632 if (parameters->target().is_attributes_section(name))
1637 // Handle .note.gnu.property sections.
1638 if (sh_type == elfcpp::SHT_NOTE
1639 && strcmp(name, ".note.gnu.property") == 0)
1641 this->layout_gnu_property_section(layout, i);
1645 bool discard = omit[i];
1648 if (sh_type == elfcpp::SHT_GROUP)
1650 if (!this->include_section_group(symtab, layout, i, name,
1656 else if ((shdr.get_sh_flags() & elfcpp::SHF_GROUP) == 0
1657 && Layout::is_linkonce(name))
1659 if (!this->include_linkonce_section(layout, i, name, shdr))
1664 // Add the section to the incremental inputs layout.
1665 Incremental_inputs* incremental_inputs = layout->incremental_inputs();
1666 if (incremental_inputs != NULL
1668 && can_incremental_update(sh_type))
1670 off_t sh_size = shdr.get_sh_size();
1671 section_size_type uncompressed_size;
1672 if (this->section_is_compressed(i, &uncompressed_size))
1673 sh_size = uncompressed_size;
1674 incremental_inputs->report_input_section(this, i, name, sh_size);
1679 // Do not include this section in the link.
1680 out_sections[i] = NULL;
1681 out_section_offsets[i] = invalid_address;
1686 if (is_pass_one && parameters->options().gc_sections())
1688 if (this->is_section_name_included(name)
1689 || layout->keep_input_section (this, name)
1690 || sh_type == elfcpp::SHT_INIT_ARRAY
1691 || sh_type == elfcpp::SHT_FINI_ARRAY)
1693 symtab->gc()->worklist().push_back(Section_id(this, i));
1695 // If the section name XXX can be represented as a C identifier
1696 // it cannot be discarded if there are references to
1697 // __start_XXX and __stop_XXX symbols. These need to be
1698 // specially handled.
1699 if (is_cident(name))
1701 symtab->gc()->add_cident_section(name, Section_id(this, i));
1705 // When doing a relocatable link we are going to copy input
1706 // reloc sections into the output. We only want to copy the
1707 // ones associated with sections which are not being discarded.
1708 // However, we don't know that yet for all sections. So save
1709 // reloc sections and process them later. Garbage collection is
1710 // not triggered when relocatable code is desired.
1712 && (sh_type == elfcpp::SHT_REL
1713 || sh_type == elfcpp::SHT_RELA))
1715 reloc_sections.push_back(i);
1719 if (relocatable && sh_type == elfcpp::SHT_GROUP)
1722 // The .eh_frame section is special. It holds exception frame
1723 // information that we need to read in order to generate the
1724 // exception frame header. We process these after all the other
1725 // sections so that the exception frame reader can reliably
1726 // determine which sections are being discarded, and discard the
1727 // corresponding information.
1728 if (this->check_eh_frame_flags(&shdr)
1729 && strcmp(name, ".eh_frame") == 0)
1731 // If the target has a special unwind section type, let's
1732 // canonicalize it here.
1733 sh_type = unwind_section_type;
1738 if (this->is_deferred_layout())
1739 out_sections[i] = reinterpret_cast<Output_section*>(2);
1741 out_sections[i] = reinterpret_cast<Output_section*>(1);
1742 out_section_offsets[i] = invalid_address;
1744 else if (this->is_deferred_layout())
1745 this->deferred_layout_.push_back(
1746 Deferred_layout(i, name, sh_type, pshdrs,
1747 reloc_shndx[i], reloc_type[i]));
1749 eh_frame_sections.push_back(i);
1754 if (is_pass_two && parameters->options().gc_sections())
1756 // This is executed during the second pass of garbage
1757 // collection. do_layout has been called before and some
1758 // sections have been already discarded. Simply ignore
1759 // such sections this time around.
1760 if (out_sections[i] == NULL)
1762 gold_assert(out_section_offsets[i] == invalid_address);
1765 if (((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0)
1766 && symtab->gc()->is_section_garbage(this, i))
1768 if (parameters->options().print_gc_sections())
1769 gold_info(_("%s: removing unused section from '%s'"
1771 program_name, this->section_name(i).c_str(),
1772 this->name().c_str());
1773 out_sections[i] = NULL;
1774 out_section_offsets[i] = invalid_address;
1779 if (is_pass_two && parameters->options().icf_enabled())
1781 if (out_sections[i] == NULL)
1783 gold_assert(out_section_offsets[i] == invalid_address);
1786 if (((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0)
1787 && symtab->icf()->is_section_folded(this, i))
1789 if (parameters->options().print_icf_sections())
1792 symtab->icf()->get_folded_section(this, i);
1793 Relobj* folded_obj =
1794 reinterpret_cast<Relobj*>(folded.first);
1795 gold_info(_("%s: ICF folding section '%s' in file '%s' "
1796 "into '%s' in file '%s'"),
1797 program_name, this->section_name(i).c_str(),
1798 this->name().c_str(),
1799 folded_obj->section_name(folded.second).c_str(),
1800 folded_obj->name().c_str());
1802 out_sections[i] = NULL;
1803 out_section_offsets[i] = invalid_address;
1808 // Defer layout here if input files are claimed by plugins. When gc
1809 // is turned on this function is called twice; we only want to do this
1810 // on the first pass.
1812 && this->is_deferred_layout()
1813 && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC))
1815 this->deferred_layout_.push_back(Deferred_layout(i, name, sh_type,
1819 // Put dummy values here; real values will be supplied by
1820 // do_layout_deferred_sections.
1821 out_sections[i] = reinterpret_cast<Output_section*>(2);
1822 out_section_offsets[i] = invalid_address;
1826 // During gc_pass_two if a section that was previously deferred is
1827 // found, do not layout the section as layout_deferred_sections will
1828 // do it later from gold.cc.
1830 && (out_sections[i] == reinterpret_cast<Output_section*>(2)))
1835 // This is during garbage collection. The out_sections are
1836 // assigned in the second call to this function.
1837 out_sections[i] = reinterpret_cast<Output_section*>(1);
1838 out_section_offsets[i] = invalid_address;
1842 // When garbage collection is switched on the actual layout
1843 // only happens in the second call.
1844 this->layout_section(layout, i, name, shdr, sh_type, reloc_shndx[i],
1847 // When generating a .gdb_index section, we do additional
1848 // processing of .debug_info and .debug_types sections after all
1849 // the other sections for the same reason as above.
1851 && parameters->options().gdb_index()
1852 && !(shdr.get_sh_flags() & elfcpp::SHF_ALLOC))
1854 if (strcmp(name, ".debug_info") == 0
1855 || strcmp(name, ".zdebug_info") == 0)
1856 debug_info_sections.push_back(i);
1857 else if (strcmp(name, ".debug_types") == 0
1858 || strcmp(name, ".zdebug_types") == 0)
1859 debug_types_sections.push_back(i);
1866 layout->merge_gnu_properties(this);
1867 layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags, this);
1870 // Handle the .eh_frame sections after the other sections.
1871 gold_assert(!is_pass_one || eh_frame_sections.empty());
1872 for (std::vector<unsigned int>::const_iterator p = eh_frame_sections.begin();
1873 p != eh_frame_sections.end();
1876 unsigned int i = *p;
1877 const unsigned char* pshdr;
1878 pshdr = section_headers_data + i * This::shdr_size;
1879 typename This::Shdr shdr(pshdr);
1881 this->layout_eh_frame_section(layout,
1892 // When doing a relocatable link handle the reloc sections at the
1893 // end. Garbage collection and Identical Code Folding is not
1894 // turned on for relocatable code.
1896 this->size_relocatable_relocs();
1898 gold_assert(!is_two_pass || reloc_sections.empty());
1900 for (std::vector<unsigned int>::const_iterator p = reloc_sections.begin();
1901 p != reloc_sections.end();
1904 unsigned int i = *p;
1905 const unsigned char* pshdr;
1906 pshdr = section_headers_data + i * This::shdr_size;
1907 typename This::Shdr shdr(pshdr);
1909 unsigned int data_shndx = this->adjust_shndx(shdr.get_sh_info());
1910 if (data_shndx >= shnum)
1912 // We already warned about this above.
1916 Output_section* data_section = out_sections[data_shndx];
1917 if (data_section == reinterpret_cast<Output_section*>(2))
1921 // The layout for the data section was deferred, so we need
1922 // to defer the relocation section, too.
1923 const char* name = pnames + shdr.get_sh_name();
1924 this->deferred_layout_relocs_.push_back(
1925 Deferred_layout(i, name, shdr.get_sh_type(), pshdr, 0,
1927 out_sections[i] = reinterpret_cast<Output_section*>(2);
1928 out_section_offsets[i] = invalid_address;
1931 if (data_section == NULL)
1933 out_sections[i] = NULL;
1934 out_section_offsets[i] = invalid_address;
1938 Relocatable_relocs* rr = new Relocatable_relocs();
1939 this->set_relocatable_relocs(i, rr);
1941 Output_section* os = layout->layout_reloc(this, i, shdr, data_section,
1943 out_sections[i] = os;
1944 out_section_offsets[i] = invalid_address;
1947 // When building a .gdb_index section, scan the .debug_info and
1948 // .debug_types sections.
1949 gold_assert(!is_pass_one
1950 || (debug_info_sections.empty() && debug_types_sections.empty()));
1951 for (std::vector<unsigned int>::const_iterator p
1952 = debug_info_sections.begin();
1953 p != debug_info_sections.end();
1956 unsigned int i = *p;
1957 layout->add_to_gdb_index(false, this, symbols_data, symbols_size,
1958 i, reloc_shndx[i], reloc_type[i]);
1960 for (std::vector<unsigned int>::const_iterator p
1961 = debug_types_sections.begin();
1962 p != debug_types_sections.end();
1965 unsigned int i = *p;
1966 layout->add_to_gdb_index(true, this, symbols_data, symbols_size,
1967 i, reloc_shndx[i], reloc_type[i]);
1972 delete[] gc_sd->section_headers_data;
1973 delete[] gc_sd->section_names_data;
1974 delete[] gc_sd->symbols_data;
1975 delete[] gc_sd->symbol_names_data;
1976 this->set_symbols_data(NULL);
1980 delete sd->section_headers;
1981 sd->section_headers = NULL;
1982 delete sd->section_names;
1983 sd->section_names = NULL;
1987 // Layout sections whose layout was deferred while waiting for
1988 // input files from a plugin.
1990 template<int size, bool big_endian>
1992 Sized_relobj_file<size, big_endian>::do_layout_deferred_sections(Layout* layout)
1994 typename std::vector<Deferred_layout>::iterator deferred;
1996 for (deferred = this->deferred_layout_.begin();
1997 deferred != this->deferred_layout_.end();
2000 typename This::Shdr shdr(deferred->shdr_data_);
2002 if (!parameters->options().relocatable()
2003 && deferred->name_ == ".eh_frame"
2004 && this->check_eh_frame_flags(&shdr))
2006 // Checking is_section_included is not reliable for
2007 // .eh_frame sections, because they do not have an output
2008 // section. This is not a problem normally because we call
2009 // layout_eh_frame_section unconditionally, but when
2010 // deferring sections that is not true. We don't want to
2011 // keep all .eh_frame sections because that will cause us to
2012 // keep all sections that they refer to, which is the wrong
2013 // way around. Instead, the eh_frame code will discard
2014 // .eh_frame sections that refer to discarded sections.
2016 // Reading the symbols again here may be slow.
2017 Read_symbols_data sd;
2018 this->base_read_symbols(&sd);
2019 this->layout_eh_frame_section(layout,
2022 sd.symbol_names->data(),
2023 sd.symbol_names_size,
2026 deferred->reloc_shndx_,
2027 deferred->reloc_type_);
2031 // If the section is not included, it is because the garbage collector
2032 // decided it is not needed. Avoid reverting that decision.
2033 if (!this->is_section_included(deferred->shndx_))
2036 this->layout_section(layout, deferred->shndx_, deferred->name_.c_str(),
2037 shdr, shdr.get_sh_type(), deferred->reloc_shndx_,
2038 deferred->reloc_type_);
2041 this->deferred_layout_.clear();
2043 // Now handle the deferred relocation sections.
2045 Output_sections& out_sections(this->output_sections());
2046 std::vector<Address>& out_section_offsets(this->section_offsets());
2048 for (deferred = this->deferred_layout_relocs_.begin();
2049 deferred != this->deferred_layout_relocs_.end();
2052 unsigned int shndx = deferred->shndx_;
2053 typename This::Shdr shdr(deferred->shdr_data_);
2054 unsigned int data_shndx = this->adjust_shndx(shdr.get_sh_info());
2056 Output_section* data_section = out_sections[data_shndx];
2057 if (data_section == NULL)
2059 out_sections[shndx] = NULL;
2060 out_section_offsets[shndx] = invalid_address;
2064 Relocatable_relocs* rr = new Relocatable_relocs();
2065 this->set_relocatable_relocs(shndx, rr);
2067 Output_section* os = layout->layout_reloc(this, shndx, shdr,
2069 out_sections[shndx] = os;
2070 out_section_offsets[shndx] = invalid_address;
2074 // Add the symbols to the symbol table.
2076 template<int size, bool big_endian>
2078 Sized_relobj_file<size, big_endian>::do_add_symbols(Symbol_table* symtab,
2079 Read_symbols_data* sd,
2082 if (sd->symbols == NULL)
2084 gold_assert(sd->symbol_names == NULL);
2088 const int sym_size = This::sym_size;
2089 size_t symcount = ((sd->symbols_size - sd->external_symbols_offset)
2091 if (symcount * sym_size != sd->symbols_size - sd->external_symbols_offset)
2093 this->error(_("size of symbols is not multiple of symbol size"));
2097 this->symbols_.resize(symcount);
2099 const char* sym_names =
2100 reinterpret_cast<const char*>(sd->symbol_names->data());
2101 symtab->add_from_relobj(this,
2102 sd->symbols->data() + sd->external_symbols_offset,
2103 symcount, this->local_symbol_count_,
2104 sym_names, sd->symbol_names_size,
2106 &this->defined_count_);
2110 delete sd->symbol_names;
2111 sd->symbol_names = NULL;
2114 // Find out if this object, that is a member of a lib group, should be included
2115 // in the link. We check every symbol defined by this object. If the symbol
2116 // table has a strong undefined reference to that symbol, we have to include
2119 template<int size, bool big_endian>
2120 Archive::Should_include
2121 Sized_relobj_file<size, big_endian>::do_should_include_member(
2122 Symbol_table* symtab,
2124 Read_symbols_data* sd,
2127 char* tmpbuf = NULL;
2128 size_t tmpbuflen = 0;
2129 const char* sym_names =
2130 reinterpret_cast<const char*>(sd->symbol_names->data());
2131 const unsigned char* syms =
2132 sd->symbols->data() + sd->external_symbols_offset;
2133 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
2134 size_t symcount = ((sd->symbols_size - sd->external_symbols_offset)
2137 const unsigned char* p = syms;
2139 for (size_t i = 0; i < symcount; ++i, p += sym_size)
2141 elfcpp::Sym<size, big_endian> sym(p);
2142 unsigned int st_shndx = sym.get_st_shndx();
2143 if (st_shndx == elfcpp::SHN_UNDEF)
2146 unsigned int st_name = sym.get_st_name();
2147 const char* name = sym_names + st_name;
2149 Archive::Should_include t = Archive::should_include_member(symtab,
2155 if (t == Archive::SHOULD_INCLUDE_YES)
2164 return Archive::SHOULD_INCLUDE_UNKNOWN;
2167 // Iterate over global defined symbols, calling a visitor class V for each.
2169 template<int size, bool big_endian>
2171 Sized_relobj_file<size, big_endian>::do_for_all_global_symbols(
2172 Read_symbols_data* sd,
2173 Library_base::Symbol_visitor_base* v)
2175 const char* sym_names =
2176 reinterpret_cast<const char*>(sd->symbol_names->data());
2177 const unsigned char* syms =
2178 sd->symbols->data() + sd->external_symbols_offset;
2179 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
2180 size_t symcount = ((sd->symbols_size - sd->external_symbols_offset)
2182 const unsigned char* p = syms;
2184 for (size_t i = 0; i < symcount; ++i, p += sym_size)
2186 elfcpp::Sym<size, big_endian> sym(p);
2187 if (sym.get_st_shndx() != elfcpp::SHN_UNDEF)
2188 v->visit(sym_names + sym.get_st_name());
2192 // Return whether the local symbol SYMNDX has a PLT offset.
2194 template<int size, bool big_endian>
2196 Sized_relobj_file<size, big_endian>::local_has_plt_offset(
2197 unsigned int symndx) const
2199 typename Local_plt_offsets::const_iterator p =
2200 this->local_plt_offsets_.find(symndx);
2201 return p != this->local_plt_offsets_.end();
2204 // Get the PLT offset of a local symbol.
2206 template<int size, bool big_endian>
2208 Sized_relobj_file<size, big_endian>::do_local_plt_offset(
2209 unsigned int symndx) const
2211 typename Local_plt_offsets::const_iterator p =
2212 this->local_plt_offsets_.find(symndx);
2213 gold_assert(p != this->local_plt_offsets_.end());
2217 // Set the PLT offset of a local symbol.
2219 template<int size, bool big_endian>
2221 Sized_relobj_file<size, big_endian>::set_local_plt_offset(
2222 unsigned int symndx, unsigned int plt_offset)
2224 std::pair<typename Local_plt_offsets::iterator, bool> ins =
2225 this->local_plt_offsets_.insert(std::make_pair(symndx, plt_offset));
2226 gold_assert(ins.second);
2229 // First pass over the local symbols. Here we add their names to
2230 // *POOL and *DYNPOOL, and we store the symbol value in
2231 // THIS->LOCAL_VALUES_. This function is always called from a
2232 // singleton thread. This is followed by a call to
2233 // finalize_local_symbols.
2235 template<int size, bool big_endian>
2237 Sized_relobj_file<size, big_endian>::do_count_local_symbols(Stringpool* pool,
2238 Stringpool* dynpool)
2240 gold_assert(this->symtab_shndx_ != -1U);
2241 if (this->symtab_shndx_ == 0)
2243 // This object has no symbols. Weird but legal.
2247 // Read the symbol table section header.
2248 const unsigned int symtab_shndx = this->symtab_shndx_;
2249 typename This::Shdr symtabshdr(this,
2250 this->elf_file_.section_header(symtab_shndx));
2251 gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
2253 // Read the local symbols.
2254 const int sym_size = This::sym_size;
2255 const unsigned int loccount = this->local_symbol_count_;
2256 gold_assert(loccount == symtabshdr.get_sh_info());
2257 off_t locsize = loccount * sym_size;
2258 const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
2259 locsize, true, true);
2261 // Read the symbol names.
2262 const unsigned int strtab_shndx =
2263 this->adjust_shndx(symtabshdr.get_sh_link());
2264 section_size_type strtab_size;
2265 const unsigned char* pnamesu = this->section_contents(strtab_shndx,
2268 const char* pnames = reinterpret_cast<const char*>(pnamesu);
2270 // Loop over the local symbols.
2272 const Output_sections& out_sections(this->output_sections());
2273 std::vector<Address>& out_section_offsets(this->section_offsets());
2274 unsigned int shnum = this->shnum();
2275 unsigned int count = 0;
2276 unsigned int dyncount = 0;
2277 // Skip the first, dummy, symbol.
2279 bool strip_all = parameters->options().strip_all();
2280 bool discard_all = parameters->options().discard_all();
2281 bool discard_locals = parameters->options().discard_locals();
2282 bool discard_sec_merge = parameters->options().discard_sec_merge();
2283 for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
2285 elfcpp::Sym<size, big_endian> sym(psyms);
2287 Symbol_value<size>& lv(this->local_values_[i]);
2290 unsigned int shndx = this->adjust_sym_shndx(i, sym.get_st_shndx(),
2292 lv.set_input_shndx(shndx, is_ordinary);
2294 if (sym.get_st_type() == elfcpp::STT_SECTION)
2295 lv.set_is_section_symbol();
2296 else if (sym.get_st_type() == elfcpp::STT_TLS)
2297 lv.set_is_tls_symbol();
2298 else if (sym.get_st_type() == elfcpp::STT_GNU_IFUNC)
2299 lv.set_is_ifunc_symbol();
2301 // Save the input symbol value for use in do_finalize_local_symbols().
2302 lv.set_input_value(sym.get_st_value());
2304 // Decide whether this symbol should go into the output file.
2308 && (out_sections[shndx] == NULL
2309 || (out_sections[shndx]->order() == ORDER_EHFRAME
2310 && out_section_offsets[shndx] == invalid_address)))
2312 // This is either a discarded section or an optimized .eh_frame
2314 lv.set_no_output_symtab_entry();
2315 gold_assert(!lv.needs_output_dynsym_entry());
2319 if (sym.get_st_type() == elfcpp::STT_SECTION
2320 || !this->adjust_local_symbol(&lv))
2322 lv.set_no_output_symtab_entry();
2323 gold_assert(!lv.needs_output_dynsym_entry());
2327 if (sym.get_st_name() >= strtab_size)
2329 this->error(_("local symbol %u section name out of range: %u >= %u"),
2330 i, sym.get_st_name(),
2331 static_cast<unsigned int>(strtab_size));
2332 lv.set_no_output_symtab_entry();
2336 const char* name = pnames + sym.get_st_name();
2338 // If needed, add the symbol to the dynamic symbol table string pool.
2339 if (lv.needs_output_dynsym_entry())
2341 dynpool->add(name, true, NULL);
2346 || (discard_all && lv.may_be_discarded_from_output_symtab()))
2348 lv.set_no_output_symtab_entry();
2352 // By default, discard temporary local symbols in merge sections.
2353 // If --discard-locals option is used, discard all temporary local
2354 // symbols. These symbols start with system-specific local label
2355 // prefixes, typically .L for ELF system. We want to be compatible
2356 // with GNU ld so here we essentially use the same check in
2357 // bfd_is_local_label(). The code is different because we already
2360 // - the symbol is local and thus cannot have global or weak binding.
2361 // - the symbol is not a section symbol.
2362 // - the symbol has a name.
2364 // We do not discard a symbol if it needs a dynamic symbol entry.
2366 || (discard_sec_merge
2368 && out_section_offsets[shndx] == invalid_address))
2369 && sym.get_st_type() != elfcpp::STT_FILE
2370 && !lv.needs_output_dynsym_entry()
2371 && lv.may_be_discarded_from_output_symtab()
2372 && parameters->target().is_local_label_name(name))
2374 lv.set_no_output_symtab_entry();
2378 // Discard the local symbol if -retain_symbols_file is specified
2379 // and the local symbol is not in that file.
2380 if (!parameters->options().should_retain_symbol(name))
2382 lv.set_no_output_symtab_entry();
2386 // Add the symbol to the symbol table string pool.
2387 pool->add(name, true, NULL);
2391 this->output_local_symbol_count_ = count;
2392 this->output_local_dynsym_count_ = dyncount;
2395 // Compute the final value of a local symbol.
2397 template<int size, bool big_endian>
2398 typename Sized_relobj_file<size, big_endian>::Compute_final_local_value_status
2399 Sized_relobj_file<size, big_endian>::compute_final_local_value_internal(
2401 const Symbol_value<size>* lv_in,
2402 Symbol_value<size>* lv_out,
2404 const Output_sections& out_sections,
2405 const std::vector<Address>& out_offsets,
2406 const Symbol_table* symtab)
2408 // We are going to overwrite *LV_OUT, if it has a merged symbol value,
2409 // we may have a memory leak.
2410 gold_assert(lv_out->has_output_value());
2413 unsigned int shndx = lv_in->input_shndx(&is_ordinary);
2415 // Set the output symbol value.
2419 if (shndx == elfcpp::SHN_ABS || Symbol::is_common_shndx(shndx))
2420 lv_out->set_output_value(lv_in->input_value());
2423 this->error(_("unknown section index %u for local symbol %u"),
2425 lv_out->set_output_value(0);
2426 return This::CFLV_ERROR;
2431 if (shndx >= this->shnum())
2433 this->error(_("local symbol %u section index %u out of range"),
2435 lv_out->set_output_value(0);
2436 return This::CFLV_ERROR;
2439 Output_section* os = out_sections[shndx];
2440 Address secoffset = out_offsets[shndx];
2441 if (symtab->is_section_folded(this, shndx))
2443 gold_assert(os == NULL && secoffset == invalid_address);
2444 // Get the os of the section it is folded onto.
2445 Section_id folded = symtab->icf()->get_folded_section(this,
2447 gold_assert(folded.first != NULL);
2448 Sized_relobj_file<size, big_endian>* folded_obj = reinterpret_cast
2449 <Sized_relobj_file<size, big_endian>*>(folded.first);
2450 os = folded_obj->output_section(folded.second);
2451 gold_assert(os != NULL);
2452 secoffset = folded_obj->get_output_section_offset(folded.second);
2454 // This could be a relaxed input section.
2455 if (secoffset == invalid_address)
2457 const Output_relaxed_input_section* relaxed_section =
2458 os->find_relaxed_input_section(folded_obj, folded.second);
2459 gold_assert(relaxed_section != NULL);
2460 secoffset = relaxed_section->address() - os->address();
2466 // This local symbol belongs to a section we are discarding.
2467 // In some cases when applying relocations later, we will
2468 // attempt to match it to the corresponding kept section,
2469 // so we leave the input value unchanged here.
2470 return This::CFLV_DISCARDED;
2472 else if (secoffset == invalid_address)
2476 // This is a SHF_MERGE section or one which otherwise
2477 // requires special handling.
2478 if (os->order() == ORDER_EHFRAME)
2480 // This local symbol belongs to a discarded or optimized
2481 // .eh_frame section. Just treat it like the case in which
2482 // os == NULL above.
2483 gold_assert(this->has_eh_frame_);
2484 return This::CFLV_DISCARDED;
2486 else if (!lv_in->is_section_symbol())
2488 // This is not a section symbol. We can determine
2489 // the final value now.
2491 os->output_address(this, shndx, lv_in->input_value());
2493 value -= os->address();
2494 lv_out->set_output_value(value);
2496 else if (!os->find_starting_output_address(this, shndx, &start))
2498 // This is a section symbol, but apparently not one in a
2499 // merged section. First check to see if this is a relaxed
2500 // input section. If so, use its address. Otherwise just
2501 // use the start of the output section. This happens with
2502 // relocatable links when the input object has section
2503 // symbols for arbitrary non-merge sections.
2504 const Output_section_data* posd =
2505 os->find_relaxed_input_section(this, shndx);
2508 uint64_t value = posd->address();
2510 value -= os->address();
2511 lv_out->set_output_value(value);
2514 lv_out->set_output_value(os->address());
2518 // We have to consider the addend to determine the
2519 // value to use in a relocation. START is the start
2520 // of this input section. If we are doing a relocatable
2521 // link, use offset from start output section instead of
2523 Address adjusted_start =
2524 relocatable ? start - os->address() : start;
2525 Merged_symbol_value<size>* msv =
2526 new Merged_symbol_value<size>(lv_in->input_value(),
2528 lv_out->set_merged_symbol_value(msv);
2531 else if (lv_in->is_tls_symbol()
2532 || (lv_in->is_section_symbol()
2533 && (os->flags() & elfcpp::SHF_TLS)))
2534 lv_out->set_output_value(os->tls_offset()
2536 + lv_in->input_value());
2538 lv_out->set_output_value((relocatable ? 0 : os->address())
2540 + lv_in->input_value());
2542 return This::CFLV_OK;
2545 // Compute final local symbol value. R_SYM is the index of a local
2546 // symbol in symbol table. LV points to a symbol value, which is
2547 // expected to hold the input value and to be over-written by the
2548 // final value. SYMTAB points to a symbol table. Some targets may want
2549 // to know would-be-finalized local symbol values in relaxation.
2550 // Hence we provide this method. Since this method updates *LV, a
2551 // callee should make a copy of the original local symbol value and
2552 // use the copy instead of modifying an object's local symbols before
2553 // everything is finalized. The caller should also free up any allocated
2554 // memory in the return value in *LV.
2555 template<int size, bool big_endian>
2556 typename Sized_relobj_file<size, big_endian>::Compute_final_local_value_status
2557 Sized_relobj_file<size, big_endian>::compute_final_local_value(
2559 const Symbol_value<size>* lv_in,
2560 Symbol_value<size>* lv_out,
2561 const Symbol_table* symtab)
2563 // This is just a wrapper of compute_final_local_value_internal.
2564 const bool relocatable = parameters->options().relocatable();
2565 const Output_sections& out_sections(this->output_sections());
2566 const std::vector<Address>& out_offsets(this->section_offsets());
2567 return this->compute_final_local_value_internal(r_sym, lv_in, lv_out,
2568 relocatable, out_sections,
2569 out_offsets, symtab);
2572 // Finalize the local symbols. Here we set the final value in
2573 // THIS->LOCAL_VALUES_ and set their output symbol table indexes.
2574 // This function is always called from a singleton thread. The actual
2575 // output of the local symbols will occur in a separate task.
2577 template<int size, bool big_endian>
2579 Sized_relobj_file<size, big_endian>::do_finalize_local_symbols(
2582 Symbol_table* symtab)
2584 gold_assert(off == static_cast<off_t>(align_address(off, size >> 3)));
2586 const unsigned int loccount = this->local_symbol_count_;
2587 this->local_symbol_offset_ = off;
2589 const bool relocatable = parameters->options().relocatable();
2590 const Output_sections& out_sections(this->output_sections());
2591 const std::vector<Address>& out_offsets(this->section_offsets());
2593 for (unsigned int i = 1; i < loccount; ++i)
2595 Symbol_value<size>* lv = &this->local_values_[i];
2597 Compute_final_local_value_status cflv_status =
2598 this->compute_final_local_value_internal(i, lv, lv, relocatable,
2599 out_sections, out_offsets,
2601 switch (cflv_status)
2604 if (!lv->is_output_symtab_index_set())
2606 lv->set_output_symtab_index(index);
2610 case CFLV_DISCARDED:
2621 // Set the output dynamic symbol table indexes for the local variables.
2623 template<int size, bool big_endian>
2625 Sized_relobj_file<size, big_endian>::do_set_local_dynsym_indexes(
2628 const unsigned int loccount = this->local_symbol_count_;
2629 for (unsigned int i = 1; i < loccount; ++i)
2631 Symbol_value<size>& lv(this->local_values_[i]);
2632 if (lv.needs_output_dynsym_entry())
2634 lv.set_output_dynsym_index(index);
2641 // Set the offset where local dynamic symbol information will be stored.
2642 // Returns the count of local symbols contributed to the symbol table by
2645 template<int size, bool big_endian>
2647 Sized_relobj_file<size, big_endian>::do_set_local_dynsym_offset(off_t off)
2649 gold_assert(off == static_cast<off_t>(align_address(off, size >> 3)));
2650 this->local_dynsym_offset_ = off;
2651 return this->output_local_dynsym_count_;
2654 // If Symbols_data is not NULL get the section flags from here otherwise
2655 // get it from the file.
2657 template<int size, bool big_endian>
2659 Sized_relobj_file<size, big_endian>::do_section_flags(unsigned int shndx)
2661 Symbols_data* sd = this->get_symbols_data();
2664 const unsigned char* pshdrs = sd->section_headers_data
2665 + This::shdr_size * shndx;
2666 typename This::Shdr shdr(pshdrs);
2667 return shdr.get_sh_flags();
2669 // If sd is NULL, read the section header from the file.
2670 return this->elf_file_.section_flags(shndx);
2673 // Get the section's ent size from Symbols_data. Called by get_section_contents
2676 template<int size, bool big_endian>
2678 Sized_relobj_file<size, big_endian>::do_section_entsize(unsigned int shndx)
2680 Symbols_data* sd = this->get_symbols_data();
2681 gold_assert(sd != NULL);
2683 const unsigned char* pshdrs = sd->section_headers_data
2684 + This::shdr_size * shndx;
2685 typename This::Shdr shdr(pshdrs);
2686 return shdr.get_sh_entsize();
2689 // Write out the local symbols.
2691 template<int size, bool big_endian>
2693 Sized_relobj_file<size, big_endian>::write_local_symbols(
2695 const Stringpool* sympool,
2696 const Stringpool* dynpool,
2697 Output_symtab_xindex* symtab_xindex,
2698 Output_symtab_xindex* dynsym_xindex,
2701 const bool strip_all = parameters->options().strip_all();
2704 if (this->output_local_dynsym_count_ == 0)
2706 this->output_local_symbol_count_ = 0;
2709 gold_assert(this->symtab_shndx_ != -1U);
2710 if (this->symtab_shndx_ == 0)
2712 // This object has no symbols. Weird but legal.
2716 // Read the symbol table section header.
2717 const unsigned int symtab_shndx = this->symtab_shndx_;
2718 typename This::Shdr symtabshdr(this,
2719 this->elf_file_.section_header(symtab_shndx));
2720 gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
2721 const unsigned int loccount = this->local_symbol_count_;
2722 gold_assert(loccount == symtabshdr.get_sh_info());
2724 // Read the local symbols.
2725 const int sym_size = This::sym_size;
2726 off_t locsize = loccount * sym_size;
2727 const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
2728 locsize, true, false);
2730 // Read the symbol names.
2731 const unsigned int strtab_shndx =
2732 this->adjust_shndx(symtabshdr.get_sh_link());
2733 section_size_type strtab_size;
2734 const unsigned char* pnamesu = this->section_contents(strtab_shndx,
2737 const char* pnames = reinterpret_cast<const char*>(pnamesu);
2739 // Get views into the output file for the portions of the symbol table
2740 // and the dynamic symbol table that we will be writing.
2741 off_t output_size = this->output_local_symbol_count_ * sym_size;
2742 unsigned char* oview = NULL;
2743 if (output_size > 0)
2744 oview = of->get_output_view(symtab_off + this->local_symbol_offset_,
2747 off_t dyn_output_size = this->output_local_dynsym_count_ * sym_size;
2748 unsigned char* dyn_oview = NULL;
2749 if (dyn_output_size > 0)
2750 dyn_oview = of->get_output_view(this->local_dynsym_offset_,
2753 const Output_sections& out_sections(this->output_sections());
2755 gold_assert(this->local_values_.size() == loccount);
2757 unsigned char* ov = oview;
2758 unsigned char* dyn_ov = dyn_oview;
2760 for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
2762 elfcpp::Sym<size, big_endian> isym(psyms);
2764 Symbol_value<size>& lv(this->local_values_[i]);
2767 unsigned int st_shndx = this->adjust_sym_shndx(i, isym.get_st_shndx(),
2771 gold_assert(st_shndx < out_sections.size());
2772 if (out_sections[st_shndx] == NULL)
2774 st_shndx = out_sections[st_shndx]->out_shndx();
2775 if (st_shndx >= elfcpp::SHN_LORESERVE)
2777 if (lv.has_output_symtab_entry())
2778 symtab_xindex->add(lv.output_symtab_index(), st_shndx);
2779 if (lv.has_output_dynsym_entry())
2780 dynsym_xindex->add(lv.output_dynsym_index(), st_shndx);
2781 st_shndx = elfcpp::SHN_XINDEX;
2785 // Write the symbol to the output symbol table.
2786 if (lv.has_output_symtab_entry())
2788 elfcpp::Sym_write<size, big_endian> osym(ov);
2790 gold_assert(isym.get_st_name() < strtab_size);
2791 const char* name = pnames + isym.get_st_name();
2792 osym.put_st_name(sympool->get_offset(name));
2793 osym.put_st_value(lv.value(this, 0));
2794 osym.put_st_size(isym.get_st_size());
2795 osym.put_st_info(isym.get_st_info());
2796 osym.put_st_other(isym.get_st_other());
2797 osym.put_st_shndx(st_shndx);
2802 // Write the symbol to the output dynamic symbol table.
2803 if (lv.has_output_dynsym_entry())
2805 gold_assert(dyn_ov < dyn_oview + dyn_output_size);
2806 elfcpp::Sym_write<size, big_endian> osym(dyn_ov);
2808 gold_assert(isym.get_st_name() < strtab_size);
2809 const char* name = pnames + isym.get_st_name();
2810 osym.put_st_name(dynpool->get_offset(name));
2811 osym.put_st_value(lv.value(this, 0));
2812 osym.put_st_size(isym.get_st_size());
2813 osym.put_st_info(isym.get_st_info());
2814 osym.put_st_other(isym.get_st_other());
2815 osym.put_st_shndx(st_shndx);
2822 if (output_size > 0)
2824 gold_assert(ov - oview == output_size);
2825 of->write_output_view(symtab_off + this->local_symbol_offset_,
2826 output_size, oview);
2829 if (dyn_output_size > 0)
2831 gold_assert(dyn_ov - dyn_oview == dyn_output_size);
2832 of->write_output_view(this->local_dynsym_offset_, dyn_output_size,
2837 // Set *INFO to symbolic information about the offset OFFSET in the
2838 // section SHNDX. Return true if we found something, false if we
2841 template<int size, bool big_endian>
2843 Sized_relobj_file<size, big_endian>::get_symbol_location_info(
2846 Symbol_location_info* info)
2848 if (this->symtab_shndx_ == 0)
2851 section_size_type symbols_size;
2852 const unsigned char* symbols = this->section_contents(this->symtab_shndx_,
2856 unsigned int symbol_names_shndx =
2857 this->adjust_shndx(this->section_link(this->symtab_shndx_));
2858 section_size_type names_size;
2859 const unsigned char* symbol_names_u =
2860 this->section_contents(symbol_names_shndx, &names_size, false);
2861 const char* symbol_names = reinterpret_cast<const char*>(symbol_names_u);
2863 const int sym_size = This::sym_size;
2864 const size_t count = symbols_size / sym_size;
2866 const unsigned char* p = symbols;
2867 for (size_t i = 0; i < count; ++i, p += sym_size)
2869 elfcpp::Sym<size, big_endian> sym(p);
2871 if (sym.get_st_type() == elfcpp::STT_FILE)
2873 if (sym.get_st_name() >= names_size)
2874 info->source_file = "(invalid)";
2876 info->source_file = symbol_names + sym.get_st_name();
2881 unsigned int st_shndx = this->adjust_sym_shndx(i, sym.get_st_shndx(),
2884 && st_shndx == shndx
2885 && static_cast<off_t>(sym.get_st_value()) <= offset
2886 && (static_cast<off_t>(sym.get_st_value() + sym.get_st_size())
2889 info->enclosing_symbol_type = sym.get_st_type();
2890 if (sym.get_st_name() > names_size)
2891 info->enclosing_symbol_name = "(invalid)";
2894 info->enclosing_symbol_name = symbol_names + sym.get_st_name();
2895 if (parameters->options().do_demangle())
2897 char* demangled_name = cplus_demangle(
2898 info->enclosing_symbol_name.c_str(),
2899 DMGL_ANSI | DMGL_PARAMS);
2900 if (demangled_name != NULL)
2902 info->enclosing_symbol_name.assign(demangled_name);
2903 free(demangled_name);
2914 // Look for a kept section corresponding to the given discarded section,
2915 // and return its output address. This is used only for relocations in
2916 // debugging sections. If we can't find the kept section, return 0.
2918 template<int size, bool big_endian>
2919 typename Sized_relobj_file<size, big_endian>::Address
2920 Sized_relobj_file<size, big_endian>::map_to_kept_section(
2922 std::string& section_name,
2925 Kept_section* kept_section;
2928 unsigned int symndx;
2931 if (this->get_kept_comdat_section(shndx, &is_comdat, &symndx, &sh_size,
2934 Relobj* kept_object = kept_section->object();
2935 unsigned int kept_shndx = 0;
2936 if (!kept_section->is_comdat())
2938 // The kept section is a linkonce section.
2939 if (sh_size == kept_section->linkonce_size())
2946 // Find the corresponding kept section.
2947 // Since we're using this mapping for relocation processing,
2948 // we don't want to match sections unless they have the same
2951 if (kept_section->find_comdat_section(section_name, &kept_shndx,
2954 if (sh_size == kept_size)
2961 if (kept_section->find_single_comdat_section(&kept_shndx,
2963 && sh_size == kept_size)
2970 Sized_relobj_file<size, big_endian>* kept_relobj =
2971 static_cast<Sized_relobj_file<size, big_endian>*>(kept_object);
2972 Output_section* os = kept_relobj->output_section(kept_shndx);
2973 Address offset = kept_relobj->get_output_section_offset(kept_shndx);
2974 if (os != NULL && offset != invalid_address)
2977 return os->address() + offset;
2985 // Look for a kept section corresponding to the given discarded section,
2986 // and return its object file.
2988 template<int size, bool big_endian>
2990 Sized_relobj_file<size, big_endian>::find_kept_section_object(
2991 unsigned int shndx, unsigned int *symndx_p) const
2993 Kept_section* kept_section;
2996 if (this->get_kept_comdat_section(shndx, &is_comdat, symndx_p, &sh_size,
2998 return kept_section->object();
3002 // Return the name of symbol SYMNDX.
3004 template<int size, bool big_endian>
3006 Sized_relobj_file<size, big_endian>::get_symbol_name(unsigned int symndx)
3008 if (this->symtab_shndx_ == 0)
3011 section_size_type symbols_size;
3012 const unsigned char* symbols = this->section_contents(this->symtab_shndx_,
3016 unsigned int symbol_names_shndx =
3017 this->adjust_shndx(this->section_link(this->symtab_shndx_));
3018 section_size_type names_size;
3019 const unsigned char* symbol_names_u =
3020 this->section_contents(symbol_names_shndx, &names_size, false);
3021 const char* symbol_names = reinterpret_cast<const char*>(symbol_names_u);
3023 const unsigned char* p = symbols + symndx * This::sym_size;
3025 if (p >= symbols + symbols_size)
3028 elfcpp::Sym<size, big_endian> sym(p);
3030 return symbol_names + sym.get_st_name();
3033 // Get symbol counts.
3035 template<int size, bool big_endian>
3037 Sized_relobj_file<size, big_endian>::do_get_global_symbol_counts(
3038 const Symbol_table*,
3042 *defined = this->defined_count_;
3044 for (typename Symbols::const_iterator p = this->symbols_.begin();
3045 p != this->symbols_.end();
3048 && (*p)->source() == Symbol::FROM_OBJECT
3049 && (*p)->object() == this
3050 && (*p)->is_defined())
3055 // Return a view of the decompressed contents of a section. Set *PLEN
3056 // to the size. Set *IS_NEW to true if the contents need to be freed
3059 const unsigned char*
3060 Object::decompressed_section_contents(
3062 section_size_type* plen,
3065 section_size_type buffer_size;
3066 const unsigned char* buffer = this->do_section_contents(shndx, &buffer_size,
3069 if (this->compressed_sections_ == NULL)
3071 *plen = buffer_size;
3076 Compressed_section_map::const_iterator p =
3077 this->compressed_sections_->find(shndx);
3078 if (p == this->compressed_sections_->end())
3080 *plen = buffer_size;
3085 section_size_type uncompressed_size = p->second.size;
3086 if (p->second.contents != NULL)
3088 *plen = uncompressed_size;
3090 return p->second.contents;
3093 unsigned char* uncompressed_data = new unsigned char[uncompressed_size];
3094 if (!decompress_input_section(buffer,
3101 this->error(_("could not decompress section %s"),
3102 this->do_section_name(shndx).c_str());
3104 // We could cache the results in p->second.contents and store
3105 // false in *IS_NEW, but build_compressed_section_map() would
3106 // have done so if it had expected it to be profitable. If
3107 // we reach this point, we expect to need the contents only
3108 // once in this pass.
3109 *plen = uncompressed_size;
3111 return uncompressed_data;
3114 // Discard any buffers of uncompressed sections. This is done
3115 // at the end of the Add_symbols task.
3118 Object::discard_decompressed_sections()
3120 if (this->compressed_sections_ == NULL)
3123 for (Compressed_section_map::iterator p = this->compressed_sections_->begin();
3124 p != this->compressed_sections_->end();
3127 if (p->second.contents != NULL)
3129 delete[] p->second.contents;
3130 p->second.contents = NULL;
3135 // Input_objects methods.
3137 // Add a regular relocatable object to the list. Return false if this
3138 // object should be ignored.
3141 Input_objects::add_object(Object* obj)
3143 // Print the filename if the -t/--trace option is selected.
3144 if (parameters->options().trace())
3145 gold_info("%s", obj->name().c_str());
3147 if (!obj->is_dynamic())
3148 this->relobj_list_.push_back(static_cast<Relobj*>(obj));
3151 // See if this is a duplicate SONAME.
3152 Dynobj* dynobj = static_cast<Dynobj*>(obj);
3153 const char* soname = dynobj->soname();
3155 Unordered_map<std::string, Object*>::value_type val(soname, obj);
3156 std::pair<Unordered_map<std::string, Object*>::iterator, bool> ins =
3157 this->sonames_.insert(val);
3160 // We have already seen a dynamic object with this soname.
3161 // If any instances of this object on the command line have
3162 // the --no-as-needed flag, make sure the one we keep is
3164 if (!obj->as_needed())
3166 gold_assert(ins.first->second != NULL);
3167 ins.first->second->clear_as_needed();
3172 this->dynobj_list_.push_back(dynobj);
3175 // Add this object to the cross-referencer if requested.
3176 if (parameters->options().user_set_print_symbol_counts()
3177 || parameters->options().cref())
3179 if (this->cref_ == NULL)
3180 this->cref_ = new Cref();
3181 this->cref_->add_object(obj);
3187 // For each dynamic object, record whether we've seen all of its
3188 // explicit dependencies.
3191 Input_objects::check_dynamic_dependencies() const
3193 bool issued_copy_dt_needed_error = false;
3194 for (Dynobj_list::const_iterator p = this->dynobj_list_.begin();
3195 p != this->dynobj_list_.end();
3198 const Dynobj::Needed& needed((*p)->needed());
3199 bool found_all = true;
3200 Dynobj::Needed::const_iterator pneeded;
3201 for (pneeded = needed.begin(); pneeded != needed.end(); ++pneeded)
3203 if (this->sonames_.find(*pneeded) == this->sonames_.end())
3209 (*p)->set_has_unknown_needed_entries(!found_all);
3211 // --copy-dt-needed-entries aka --add-needed is a GNU ld option
3212 // that gold does not support. However, they cause no trouble
3213 // unless there is a DT_NEEDED entry that we don't know about;
3214 // warn only in that case.
3216 && !issued_copy_dt_needed_error
3217 && (parameters->options().copy_dt_needed_entries()
3218 || parameters->options().add_needed()))
3220 const char* optname;
3221 if (parameters->options().copy_dt_needed_entries())
3222 optname = "--copy-dt-needed-entries";
3224 optname = "--add-needed";
3225 gold_error(_("%s is not supported but is required for %s in %s"),
3226 optname, (*pneeded).c_str(), (*p)->name().c_str());
3227 issued_copy_dt_needed_error = true;
3232 // Start processing an archive.
3235 Input_objects::archive_start(Archive* archive)
3237 if (parameters->options().user_set_print_symbol_counts()
3238 || parameters->options().cref())
3240 if (this->cref_ == NULL)
3241 this->cref_ = new Cref();
3242 this->cref_->add_archive_start(archive);
3246 // Stop processing an archive.
3249 Input_objects::archive_stop(Archive* archive)
3251 if (parameters->options().user_set_print_symbol_counts()
3252 || parameters->options().cref())
3253 this->cref_->add_archive_stop(archive);
3256 // Print symbol counts
3259 Input_objects::print_symbol_counts(const Symbol_table* symtab) const
3261 if (parameters->options().user_set_print_symbol_counts()
3262 && this->cref_ != NULL)
3263 this->cref_->print_symbol_counts(symtab);
3266 // Print a cross reference table.
3269 Input_objects::print_cref(const Symbol_table* symtab, FILE* f) const
3271 if (parameters->options().cref() && this->cref_ != NULL)
3272 this->cref_->print_cref(symtab, f);
3275 // Relocate_info methods.
3277 // Return a string describing the location of a relocation when file
3278 // and lineno information is not available. This is only used in
3281 template<int size, bool big_endian>
3283 Relocate_info<size, big_endian>::location(size_t, off_t offset) const
3285 Sized_dwarf_line_info<size, big_endian> line_info(this->object);
3286 std::string ret = line_info.addr2line(this->data_shndx, offset, NULL);
3290 ret = this->object->name();
3292 Symbol_location_info info;
3293 if (this->object->get_symbol_location_info(this->data_shndx, offset, &info))
3295 if (!info.source_file.empty())
3298 ret += info.source_file;
3301 if (info.enclosing_symbol_type == elfcpp::STT_FUNC)
3302 ret += _("function ");
3303 ret += info.enclosing_symbol_name;
3308 ret += this->object->section_name(this->data_shndx);
3310 snprintf(buf, sizeof buf, "+0x%lx)", static_cast<long>(offset));
3315 } // End namespace gold.
3320 using namespace gold;
3322 // Read an ELF file with the header and return the appropriate
3323 // instance of Object.
3325 template<int size, bool big_endian>
3327 make_elf_sized_object(const std::string& name, Input_file* input_file,
3328 off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr,
3329 bool* punconfigured)
3331 Target* target = select_target(input_file, offset,
3332 ehdr.get_e_machine(), size, big_endian,
3333 ehdr.get_e_ident()[elfcpp::EI_OSABI],
3334 ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]);
3336 gold_fatal(_("%s: unsupported ELF machine number %d"),
3337 name.c_str(), ehdr.get_e_machine());
3339 if (!parameters->target_valid())
3340 set_parameters_target(target);
3341 else if (target != ¶meters->target())
3343 if (punconfigured != NULL)
3344 *punconfigured = true;
3346 gold_error(_("%s: incompatible target"), name.c_str());
3350 return target->make_elf_object<size, big_endian>(name, input_file, offset,
3354 } // End anonymous namespace.
3359 // Return whether INPUT_FILE is an ELF object.
3362 is_elf_object(Input_file* input_file, off_t offset,
3363 const unsigned char** start, int* read_size)
3365 off_t filesize = input_file->file().filesize();
3366 int want = elfcpp::Elf_recognizer::max_header_size;
3367 if (filesize - offset < want)
3368 want = filesize - offset;
3370 const unsigned char* p = input_file->file().get_view(offset, 0, want,
3375 return elfcpp::Elf_recognizer::is_elf_file(p, want);
3378 // Read an ELF file and return the appropriate instance of Object.
3381 make_elf_object(const std::string& name, Input_file* input_file, off_t offset,
3382 const unsigned char* p, section_offset_type bytes,
3383 bool* punconfigured)
3385 if (punconfigured != NULL)
3386 *punconfigured = false;
3389 bool big_endian = false;
3391 if (!elfcpp::Elf_recognizer::is_valid_header(p, bytes, &size,
3392 &big_endian, &error))
3394 gold_error(_("%s: %s"), name.c_str(), error.c_str());
3402 #ifdef HAVE_TARGET_32_BIG
3403 elfcpp::Ehdr<32, true> ehdr(p);
3404 return make_elf_sized_object<32, true>(name, input_file,
3405 offset, ehdr, punconfigured);
3407 if (punconfigured != NULL)
3408 *punconfigured = true;
3410 gold_error(_("%s: not configured to support "
3411 "32-bit big-endian object"),
3418 #ifdef HAVE_TARGET_32_LITTLE
3419 elfcpp::Ehdr<32, false> ehdr(p);
3420 return make_elf_sized_object<32, false>(name, input_file,
3421 offset, ehdr, punconfigured);
3423 if (punconfigured != NULL)
3424 *punconfigured = true;
3426 gold_error(_("%s: not configured to support "
3427 "32-bit little-endian object"),
3433 else if (size == 64)
3437 #ifdef HAVE_TARGET_64_BIG
3438 elfcpp::Ehdr<64, true> ehdr(p);
3439 return make_elf_sized_object<64, true>(name, input_file,
3440 offset, ehdr, punconfigured);
3442 if (punconfigured != NULL)
3443 *punconfigured = true;
3445 gold_error(_("%s: not configured to support "
3446 "64-bit big-endian object"),
3453 #ifdef HAVE_TARGET_64_LITTLE
3454 elfcpp::Ehdr<64, false> ehdr(p);
3455 return make_elf_sized_object<64, false>(name, input_file,
3456 offset, ehdr, punconfigured);
3458 if (punconfigured != NULL)
3459 *punconfigured = true;
3461 gold_error(_("%s: not configured to support "
3462 "64-bit little-endian object"),
3472 // Instantiate the templates we need.
3474 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
3477 Relobj::initialize_input_to_output_map<64>(unsigned int shndx,
3478 elfcpp::Elf_types<64>::Elf_Addr starting_address,
3479 Unordered_map<section_offset_type,
3480 elfcpp::Elf_types<64>::Elf_Addr>* output_addresses) const;
3483 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
3486 Relobj::initialize_input_to_output_map<32>(unsigned int shndx,
3487 elfcpp::Elf_types<32>::Elf_Addr starting_address,
3488 Unordered_map<section_offset_type,
3489 elfcpp::Elf_types<32>::Elf_Addr>* output_addresses) const;
3492 #ifdef HAVE_TARGET_32_LITTLE
3495 Object::read_section_data<32, false>(elfcpp::Elf_file<32, false, Object>*,
3496 Read_symbols_data*);
3498 const unsigned char*
3499 Object::find_shdr<32,false>(const unsigned char*, const char*, const char*,
3500 section_size_type, const unsigned char*) const;
3503 #ifdef HAVE_TARGET_32_BIG
3506 Object::read_section_data<32, true>(elfcpp::Elf_file<32, true, Object>*,
3507 Read_symbols_data*);
3509 const unsigned char*
3510 Object::find_shdr<32,true>(const unsigned char*, const char*, const char*,
3511 section_size_type, const unsigned char*) const;
3514 #ifdef HAVE_TARGET_64_LITTLE
3517 Object::read_section_data<64, false>(elfcpp::Elf_file<64, false, Object>*,
3518 Read_symbols_data*);
3520 const unsigned char*
3521 Object::find_shdr<64,false>(const unsigned char*, const char*, const char*,
3522 section_size_type, const unsigned char*) const;
3525 #ifdef HAVE_TARGET_64_BIG
3528 Object::read_section_data<64, true>(elfcpp::Elf_file<64, true, Object>*,
3529 Read_symbols_data*);
3531 const unsigned char*
3532 Object::find_shdr<64,true>(const unsigned char*, const char*, const char*,
3533 section_size_type, const unsigned char*) const;
3536 #ifdef HAVE_TARGET_32_LITTLE
3538 class Sized_relobj<32, false>;
3541 class Sized_relobj_file<32, false>;
3544 #ifdef HAVE_TARGET_32_BIG
3546 class Sized_relobj<32, true>;
3549 class Sized_relobj_file<32, true>;
3552 #ifdef HAVE_TARGET_64_LITTLE
3554 class Sized_relobj<64, false>;
3557 class Sized_relobj_file<64, false>;
3560 #ifdef HAVE_TARGET_64_BIG
3562 class Sized_relobj<64, true>;
3565 class Sized_relobj_file<64, true>;
3568 #ifdef HAVE_TARGET_32_LITTLE
3570 struct Relocate_info<32, false>;
3573 #ifdef HAVE_TARGET_32_BIG
3575 struct Relocate_info<32, true>;
3578 #ifdef HAVE_TARGET_64_LITTLE
3580 struct Relocate_info<64, false>;
3583 #ifdef HAVE_TARGET_64_BIG
3585 struct Relocate_info<64, true>;
3588 #ifdef HAVE_TARGET_32_LITTLE
3591 Xindex::initialize_symtab_xindex<32, false>(Object*, unsigned int);
3595 Xindex::read_symtab_xindex<32, false>(Object*, unsigned int,
3596 const unsigned char*);
3599 #ifdef HAVE_TARGET_32_BIG
3602 Xindex::initialize_symtab_xindex<32, true>(Object*, unsigned int);
3606 Xindex::read_symtab_xindex<32, true>(Object*, unsigned int,
3607 const unsigned char*);
3610 #ifdef HAVE_TARGET_64_LITTLE
3613 Xindex::initialize_symtab_xindex<64, false>(Object*, unsigned int);
3617 Xindex::read_symtab_xindex<64, false>(Object*, unsigned int,
3618 const unsigned char*);
3621 #ifdef HAVE_TARGET_64_BIG
3624 Xindex::initialize_symtab_xindex<64, true>(Object*, unsigned int);
3628 Xindex::read_symtab_xindex<64, true>(Object*, unsigned int,
3629 const unsigned char*);
3632 #ifdef HAVE_TARGET_32_LITTLE
3634 Compressed_section_map*
3635 build_compressed_section_map<32, false>(const unsigned char*, unsigned int,
3636 const char*, section_size_type,
3640 #ifdef HAVE_TARGET_32_BIG
3642 Compressed_section_map*
3643 build_compressed_section_map<32, true>(const unsigned char*, unsigned int,
3644 const char*, section_size_type,
3648 #ifdef HAVE_TARGET_64_LITTLE
3650 Compressed_section_map*
3651 build_compressed_section_map<64, false>(const unsigned char*, unsigned int,
3652 const char*, section_size_type,
3656 #ifdef HAVE_TARGET_64_BIG
3658 Compressed_section_map*
3659 build_compressed_section_map<64, true>(const unsigned char*, unsigned int,
3660 const char*, section_size_type,
3664 } // End namespace gold.